[v5,04/13] LoongArch: ABI Implementation
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Commit Message
---
sysdeps/loongarch/__longjmp.S | 52 ++++
sysdeps/loongarch/bits/endianness.h | 11 +
sysdeps/loongarch/bits/link.h | 58 ++++
sysdeps/loongarch/bits/setjmp.h | 42 +++
sysdeps/loongarch/bsd-_setjmp.c | 1 +
sysdeps/loongarch/bsd-setjmp.c | 1 +
sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
sysdeps/loongarch/dl-trampoline.S | 91 ++++++
sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
sysdeps/loongarch/ldsodefs.h | 41 +++
sysdeps/loongarch/linkmap.h | 22 ++
sysdeps/loongarch/machine-gmon.h | 37 +++
sysdeps/loongarch/setjmp.S | 66 ++++
sysdeps/loongarch/sotruss-lib.c | 50 +++
sysdeps/loongarch/start.S | 67 ++++
sysdeps/loongarch/sys/asm.h | 59 ++++
sysdeps/loongarch/tst-audit.h | 23 ++
sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
19 files changed, 1021 insertions(+)
create mode 100644 sysdeps/loongarch/__longjmp.S
create mode 100644 sysdeps/loongarch/bits/endianness.h
create mode 100644 sysdeps/loongarch/bits/link.h
create mode 100644 sysdeps/loongarch/bits/setjmp.h
create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
create mode 100644 sysdeps/loongarch/bsd-setjmp.c
create mode 100644 sysdeps/loongarch/dl-machine.h
create mode 100644 sysdeps/loongarch/dl-trampoline.S
create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
create mode 100644 sysdeps/loongarch/ldsodefs.h
create mode 100644 sysdeps/loongarch/linkmap.h
create mode 100644 sysdeps/loongarch/machine-gmon.h
create mode 100644 sysdeps/loongarch/setjmp.S
create mode 100644 sysdeps/loongarch/sotruss-lib.c
create mode 100644 sysdeps/loongarch/start.S
create mode 100644 sysdeps/loongarch/sys/asm.h
create mode 100644 sysdeps/loongarch/tst-audit.h
create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
Comments
On 2022-06-01, caiyinyu wrote:
>---
> sysdeps/loongarch/__longjmp.S | 52 ++++
> sysdeps/loongarch/bits/endianness.h | 11 +
> sysdeps/loongarch/bits/link.h | 58 ++++
> sysdeps/loongarch/bits/setjmp.h | 42 +++
> sysdeps/loongarch/bsd-_setjmp.c | 1 +
> sysdeps/loongarch/bsd-setjmp.c | 1 +
> sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
> sysdeps/loongarch/dl-trampoline.S | 91 ++++++
> sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
> sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
> sysdeps/loongarch/ldsodefs.h | 41 +++
> sysdeps/loongarch/linkmap.h | 22 ++
> sysdeps/loongarch/machine-gmon.h | 37 +++
> sysdeps/loongarch/setjmp.S | 66 ++++
> sysdeps/loongarch/sotruss-lib.c | 50 +++
> sysdeps/loongarch/start.S | 67 ++++
> sysdeps/loongarch/sys/asm.h | 59 ++++
> sysdeps/loongarch/tst-audit.h | 23 ++
> sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
> 19 files changed, 1021 insertions(+)
> create mode 100644 sysdeps/loongarch/__longjmp.S
> create mode 100644 sysdeps/loongarch/bits/endianness.h
> create mode 100644 sysdeps/loongarch/bits/link.h
> create mode 100644 sysdeps/loongarch/bits/setjmp.h
> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
> create mode 100644 sysdeps/loongarch/dl-machine.h
> create mode 100644 sysdeps/loongarch/dl-trampoline.S
> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
> create mode 100644 sysdeps/loongarch/ldsodefs.h
> create mode 100644 sysdeps/loongarch/linkmap.h
> create mode 100644 sysdeps/loongarch/machine-gmon.h
> create mode 100644 sysdeps/loongarch/setjmp.S
> create mode 100644 sysdeps/loongarch/sotruss-lib.c
> create mode 100644 sysdeps/loongarch/start.S
> create mode 100644 sysdeps/loongarch/sys/asm.h
> create mode 100644 sysdeps/loongarch/tst-audit.h
> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>
>diff --git a/sysdeps/loongarch/__longjmp.S b/sysdeps/loongarch/__longjmp.S
>new file mode 100644
>index 0000000000..b7690dd94f
>--- /dev/null
>+++ b/sysdeps/loongarch/__longjmp.S
>@@ -0,0 +1,52 @@
>+/* longjmp.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#include <sysdep.h>
>+#include <sys/asm.h>
>+
>+ENTRY (__longjmp)
>+ REG_L ra, a0, 0*SZREG
>+ REG_L sp, a0, 1*SZREG
>+ REG_L x, a0, 2*SZREG
>+ REG_L fp, a0, 3*SZREG
>+ REG_L s0, a0, 4*SZREG
>+ REG_L s1, a0, 5*SZREG
>+ REG_L s2, a0, 6*SZREG
>+ REG_L s3, a0, 7*SZREG
>+ REG_L s4, a0, 8*SZREG
>+ REG_L s5, a0, 9*SZREG
>+ REG_L s6, a0, 10*SZREG
>+ REG_L s7, a0, 11*SZREG
>+ REG_L s8, a0, 12*SZREG
>+
>+#ifndef __loongarch_soft_float
>+ FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>+ FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>+ FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>+ FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>+ FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>+ FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>+ FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>+ FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>+#endif
>+
>+ sltui a0,a1,1
>+ ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
>+ jirl zero,ra,0
>+
>+END (__longjmp)
>diff --git a/sysdeps/loongarch/bits/endianness.h b/sysdeps/loongarch/bits/endianness.h
>new file mode 100644
>index 0000000000..7290be7b18
>--- /dev/null
>+++ b/sysdeps/loongarch/bits/endianness.h
>@@ -0,0 +1,11 @@
>+#ifndef _BITS_ENDIANNESS_H
>+#define _BITS_ENDIANNESS_H 1
>+
>+#ifndef _BITS_ENDIAN_H
>+#error "Never use <bits/endianness.h> directly; include <endian.h> instead."
>+#endif
>+
>+/* LoongArch is little-endian. */
>+#define __BYTE_ORDER __LITTLE_ENDIAN
>+
>+#endif /* bits/endianness.h */
>diff --git a/sysdeps/loongarch/bits/link.h b/sysdeps/loongarch/bits/link.h
>new file mode 100644
>index 0000000000..4df09989cb
>--- /dev/null
>+++ b/sysdeps/loongarch/bits/link.h
>@@ -0,0 +1,58 @@
>+/* Machine-specific declarations for dynamic linker interface.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#ifndef _LINK_H
>+#error "Never include <bits/link.h> directly; use <link.h> instead."
>+#endif
>+
>+typedef struct La_loongarch_regs
>+{
>+ unsigned long int lr_reg[8]; /* a0 - a7 */
>+ double lr_fpreg[8]; /* fa0 - fa7 */
>+ unsigned long int lr_ra;
>+ unsigned long int lr_sp;
>+} La_loongarch_regs;
>+
>+/* Return values for calls from PLT on LoongArch. */
>+typedef struct La_loongarch_retval
>+{
>+ unsigned long int lrv_a0;
>+ unsigned long int lrv_a1;
>+ double lrv_fa0;
>+ double lrv_fa1;
>+} La_loongarch_retval;
>+
>+__BEGIN_DECLS
>+
>+extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>+ unsigned int __ndx,
>+ uintptr_t *__refcook,
>+ uintptr_t *__defcook,
>+ La_loongarch_regs *__regs,
>+ unsigned int *__flags,
>+ const char *__symname,
>+ long int *__framesizep);
>+extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>+ unsigned int __ndx,
>+ uintptr_t *__refcook,
>+ uintptr_t *__defcook,
>+ const La_loongarch_regs *__inregs,
>+ La_loongarch_retval *__outregs,
>+ const char *__symname);
>+
>+__END_DECLS
>diff --git a/sysdeps/loongarch/bits/setjmp.h b/sysdeps/loongarch/bits/setjmp.h
>new file mode 100644
>index 0000000000..8b323ad2b6
>--- /dev/null
>+++ b/sysdeps/loongarch/bits/setjmp.h
>@@ -0,0 +1,42 @@
>+/* Define the machine-dependent type `jmp_buf'.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#ifndef _LOONGARCH_BITS_SETJMP_H
>+#define _LOONGARCH_BITS_SETJMP_H
>+
>+typedef struct __jmp_buf_internal_tag
>+{
>+ /* Program counter. */
>+ long int __pc;
>+ /* Stack pointer. */
>+ long int __sp;
>+ /* Reserved */
>+ long int __x;
>+ /* Frame pointer. */
>+ long int __fp;
>+ /* Callee-saved registers. */
>+ long int __regs[9];
>+
>+#ifndef __loongarch_soft_float
>+ /* Callee-saved floating point registers. */
>+ double __fpregs[8];
>+#endif
>+
>+} __jmp_buf[1];
>+
>+#endif /* _LOONGARCH_BITS_SETJMP_H */
>diff --git a/sysdeps/loongarch/bsd-_setjmp.c b/sysdeps/loongarch/bsd-_setjmp.c
>new file mode 100644
>index 0000000000..32f49441c3
>--- /dev/null
>+++ b/sysdeps/loongarch/bsd-_setjmp.c
>@@ -0,0 +1 @@
>+/* _setjmp is implemented in setjmp.S. */
>diff --git a/sysdeps/loongarch/bsd-setjmp.c b/sysdeps/loongarch/bsd-setjmp.c
>new file mode 100644
>index 0000000000..45fd802aac
>--- /dev/null
>+++ b/sysdeps/loongarch/bsd-setjmp.c
>@@ -0,0 +1 @@
>+/* setjmp is implemented in setjmp.S. */
>diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
>new file mode 100644
>index 0000000000..4e19ad9319
>--- /dev/null
>+++ b/sysdeps/loongarch/dl-machine.h
>@@ -0,0 +1,307 @@
>+/* Machine-dependent ELF dynamic relocation inline functions.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#ifndef dl_machine_h
>+#define dl_machine_h
>+
>+#define ELF_MACHINE_NAME "LoongArch"
>+
>+#include <entry.h>
>+#include <elf/elf.h>
>+#include <sys/asm.h>
>+#include <dl-tls.h>
>+#include <dl-static-tls.h>
>+#include <dl-machine-rel.h>
>+
>+#ifndef _RTLD_PROLOGUE
>+# define _RTLD_PROLOGUE(entry) \
>+ ".globl\t" __STRING (entry) "\n\t" \
>+ ".type\t" __STRING (entry) ", @function\n\t" \
>+ CFI_STARTPROC "\n" \
>+ __STRING (entry) ":\n"
>+#endif
>+
>+#ifndef _RTLD_EPILOGUE
>+# define _RTLD_EPILOGUE(entry) \
>+ CFI_ENDPROC "\n\t" \
>+ ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>+#endif
>+
>+#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>+#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>+
>+#define elf_machine_type_class(type) \
>+ ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
seems an unneeded hack for many ports. Can you check does loongarch
really need them?
>+ | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>+
>+#define ELF_MACHINE_NO_REL 1
>+#define ELF_MACHINE_NO_RELA 0
>+
>+/* Return nonzero iff ELF header is compatible with the running host. */
>+static inline int
>+elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>+{
>+ /* We can only run LoongArch binaries. */
>+ if (ehdr->e_machine != EM_LOONGARCH)
>+ return 0;
>+
>+ return 1;
>+}
>+
>+/* Return the run-time load address of the shared object. */
>+static inline ElfW (Addr) elf_machine_load_address (void)
>+{
>+ extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>+ return (ElfW(Addr)) &__ehdr_start;
>+}
>+
>+/* Return the link-time address of _DYNAMIC. */
>+static inline ElfW (Addr) elf_machine_dynamic (void)
>+{
>+ extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>+ return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>+}
>+
>+/* Initial entry point code for the dynamic linker.
>+ The C function `_dl_start' is the real entry point;
>+ its return value is the user program's entry point. */
>+
>+#define RTLD_START \
>+ asm(".text\n\
>+ " _RTLD_PROLOGUE (ENTRY_POINT) "\
>+ .cfi_label .Ldummy \n\
>+ " CFI_UNDEFINED (1) " \n\
>+ or $a0, $sp, $zero \n\
>+ bl _dl_start \n\
>+ # Stash user entry point in s0. \n\
>+ or $s0, $v0, $zero \n\
>+ # Load the original argument count. \n\
>+ ld.d $a1, $sp, 0 \n\
>+ # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
>+ char **env) \n\
>+ la $a0, _rtld_local \n\
>+ ld.d $a0, $a0, 0 \n\
>+ addi.d $a2, $sp, 8 \n\
>+ slli.d $a3, $a1, 3 \n\
>+ add.d $a3, $a3, $a2 \n\
>+ addi.d $a3, $a3, 8 \n\
The _dl_init seems much more complex than the riscv counterpart.
>+ # Adjust $sp for 16-aligned \n\
>+ srli.d $t0, $sp, 4 \n\
>+ slli.d $t0, $t0, 4 \n\
>+ ori $t1, $sp, 0 \n\
>+ addi.d $sp, $t0, -32 \n\
>+ st.d $t1, $sp, 24 \n\
Seems too complex.
>+ # Call the function to run the initializers. \n\
>+ bl _dl_init \n\
>+ # Pass our finalizer function to _start. \n\
>+ ld.d $sp, $sp, 24 \n\
>+ la $a0, _dl_fini \n\
>+ # Jump to the user entry point. \n\
>+ jirl $zero, $s0, 0 \n\
>+ " _RTLD_EPILOGUE (ENTRY_POINT) "\
>+ .previous");
>+
>+/* Names of the architecture-specific auditing callback functions. */
>+#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>+#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>+
>+/* Bias .got.plt entry by the offset requested by the PLT header. */
>+#define elf_machine_plt_value(map, reloc, value) (value)
>+
>+static inline ElfW (Addr)
>+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>+ const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>+ const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>+ ElfW (Addr) value)
>+{
>+ return *reloc_addr = value;
>+}
>+
>+#endif /* !dl_machine_h */
>+
>+#ifdef RESOLVE_MAP
>+
>+/* Perform a relocation described by R_INFO at the location pointed to
>+ by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
>+ MAP is the object containing the reloc. */
>+
>+static inline void __attribute__ ((always_inline))
>+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>+ const ElfW (Rela) * reloc,
>+ const ElfW (Sym) * sym,
Seems excess space after `*`
>+ const struct r_found_version *version,
>+ void *const reloc_addr, int skip_ifunc)
>+{
>+ ElfW (Addr) r_info = reloc->r_info;
>+ const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>+ ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>+ const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>+ struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type);
>+ ElfW (Addr) value = 0;
>+ if (sym_map != NULL)
>+ value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>+
>+ if (sym != NULL
>+ && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
>+ && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>+ && __glibc_likely (!skip_ifunc))
>+ value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>+
>+ switch (r_type)
>+ {
>+#ifndef RTLD_BOOTSTRAP
>+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>+ R_LARCH_TLS_DTPMOD32:
>+ if (sym_map)
>+ *addr_field = sym_map->l_tls_modid;
>+ break;
I know many ports do `if (sym_map)` but that seems (a) a workaround for possibly
GNU ld bugs or (b) unneeded cargo cult.
The check should better be removed.
This applies to various TLS dynamic relocations below.
>+
>+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>+ R_LARCH_TLS_DTPREL32:
>+ if (sym != NULL)
>+ *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>+ break;
>+
>+ case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>+ R_LARCH_TLS_TPREL32:
>+ if (sym != NULL)
>+ {
>+ CHECK_STATIC_TLS (map, sym_map);
>+ *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>+ }
>+ break;
>+
>+ case R_LARCH_COPY:
>+ {
>+ if (sym == NULL)
>+ /* This can happen in trace mode if an object could not be
>+ found. */
>+ break;
>+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
>+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
>+ && GLRO(dl_verbose)))
>+ {
>+ const char *strtab;
>+
>+ strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>+ _dl_error_printf ("\
>+%s: Symbol `%s' has different size in shared object, consider re-linking\n",
>+ rtld_progname ?: "<program name unknown>",
>+ strtab + refsym->st_name);
>+ }
>+ memcpy (reloc_addr, (void *) value,
>+ MIN (sym->st_size, refsym->st_size));
>+ break;
>+ }
>+#endif
>+
>+#if !defined RTLD_BOOTSTRAP
>+ case R_LARCH_RELATIVE:
>+ *addr_field = map->l_addr + reloc->r_addend;
>+ break;
>+#endif
I think this is copied from riscv but its relocation code is probably
not the best reference. sysdeps/m68k/dl-machine.h may be one of the
better implementations for the relocation switch table.
In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
needed in this function. There should be none of NONE, RELATIVE,
IRELATIVE, absolute relocation types, etc (RELATIVE is handled
elsewhere).
GNU ld, in the presence of a bug, may produce spurious NONE relocations.
Not handling NONE can catch some bugs.
>+ case R_LARCH_JUMP_SLOT:
>+ case __WORDSIZE == 64 ? R_LARCH_64:
>+ R_LARCH_32:
>+ *addr_field = value;
>+ break;
>+
>+ case R_LARCH_IRELATIVE:
>+ value = map->l_addr + reloc->r_addend;
>+ if (__glibc_likely (!skip_ifunc))
>+ value = ((ElfW (Addr) (*) (void)) value) ();
>+ *addr_field = value;
>+ break;
>+
>+ case R_LARCH_NONE:
>+ break;
>+
>+ default:
>+ _dl_reloc_bad_type (map, r_type, 0);
>+ break;
>+ }
>+}
>+
>+static inline void __attribute__ ((always_inline))
>+elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) * reloc,
>+ void *const reloc_addr)
>+{
>+ *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>+}
>+
>+static inline void __attribute__ ((always_inline))
>+elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
>+ ElfW (Addr) l_addr,
>+ const ElfW (Rela) * reloc, int skip_ifunc)
>+{
>+ ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
>+ const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>+
>+ /* Check for unexpected PLT reloc type. */
>+ if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>+ {
>+ if (__glibc_unlikely (map->l_mach.plt == 0))
>+ {
>+ if (l_addr)
>+ *reloc_addr += l_addr;
>+ }
>+ else
>+ *reloc_addr = map->l_mach.plt;
>+ }
>+ else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
This is a design issue of ifunc for many ports.
Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
.rela.plt, then you can remove this branch.
>+ {
>+ ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>+ if (__glibc_likely (!skip_ifunc))
>+ value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>+ *reloc_addr = (ElfW (Addr)) value;
>+ }
>+ else
>+ _dl_reloc_bad_type (map, r_type, 1);
>+}
>+
>+/* Set up the loaded object described by L so its stub function
>+ will jump to the on-demand fixup code __dl_runtime_resolve. */
>+
>+static inline int __attribute__ ((always_inline))
>+elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
>+ int lazy, int profile)
>+{
>+#ifndef RTLD_BOOTSTRAP
>+ /* If using PLTs, fill in the first two entries of .got.plt. */
>+ if (l->l_info[DT_JMPREL])
>+ {
>+ extern void _dl_runtime_resolve (void)
>+ __attribute__ ((visibility ("hidden")));
>+ ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
>+ gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>+ gotplt[1] = (ElfW (Addr)) l;
>+ }
>+#endif
>+
>+ return lazy;
>+}
>+
>+#endif /* RESOLVE_MAP */
>diff --git a/sysdeps/loongarch/dl-trampoline.S b/sysdeps/loongarch/dl-trampoline.S
>new file mode 100644
>index 0000000000..eb610392f6
>--- /dev/null
>+++ b/sysdeps/loongarch/dl-trampoline.S
>@@ -0,0 +1,91 @@
>+/* PLT trampolines.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#include <sysdep.h>
>+#include <sys/asm.h>
>+
>+/* Assembler veneer called from the PLT header code for lazy loading.
>+ The PLT header passes its own args in t0-t2. */
>+
>+#ifdef __loongarch_soft_float
>+# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>+#else
>+# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>+#endif
>+
>+ENTRY (_dl_runtime_resolve)
>+
>+ /* Save arguments to stack. */
>+ ADDI sp, sp, -FRAME_SIZE
>+
>+ REG_S ra, sp, 9*SZREG
>+ REG_S a0, sp, 1*SZREG
>+ REG_S a1, sp, 2*SZREG
>+ REG_S a2, sp, 3*SZREG
>+ REG_S a3, sp, 4*SZREG
>+ REG_S a4, sp, 5*SZREG
>+ REG_S a5, sp, 6*SZREG
>+ REG_S a6, sp, 7*SZREG
>+ REG_S a7, sp, 8*SZREG
>+
>+#ifndef __loongarch_soft_float
>+ FREG_S fa0, sp, 10*SZREG + 0*SZFREG
>+ FREG_S fa1, sp, 10*SZREG + 1*SZFREG
>+ FREG_S fa2, sp, 10*SZREG + 2*SZFREG
>+ FREG_S fa3, sp, 10*SZREG + 3*SZFREG
>+ FREG_S fa4, sp, 10*SZREG + 4*SZFREG
>+ FREG_S fa5, sp, 10*SZREG + 5*SZFREG
>+ FREG_S fa6, sp, 10*SZREG + 6*SZFREG
>+ FREG_S fa7, sp, 10*SZREG + 7*SZFREG
>+#endif
>+
>+ /* Update .got.plt and obtain runtime address of callee */
>+ SLLI a1, t1, 1
>+ or a0, t0, zero
>+ ADD a1, a1, t1
>+ la a2, _dl_fixup
>+ jirl ra, a2, 0
>+ or t1, v0, zero
>+
>+ /* Restore arguments from stack. */
>+ REG_L ra, sp, 9*SZREG
>+ REG_L a0, sp, 1*SZREG
>+ REG_L a1, sp, 2*SZREG
>+ REG_L a2, sp, 3*SZREG
>+ REG_L a3, sp, 4*SZREG
>+ REG_L a4, sp, 5*SZREG
>+ REG_L a5, sp, 6*SZREG
>+ REG_L a6, sp, 7*SZREG
>+ REG_L a7, sp, 8*SZREG
>+
>+#ifndef __loongarch_soft_float
>+ FREG_L fa0, sp, 10*SZREG + 0*SZFREG
>+ FREG_L fa1, sp, 10*SZREG + 1*SZFREG
>+ FREG_L fa2, sp, 10*SZREG + 2*SZFREG
>+ FREG_L fa3, sp, 10*SZREG + 3*SZFREG
>+ FREG_L fa4, sp, 10*SZREG + 4*SZFREG
>+ FREG_L fa5, sp, 10*SZREG + 5*SZFREG
>+ FREG_L fa6, sp, 10*SZREG + 6*SZFREG
>+ FREG_L fa7, sp, 10*SZREG + 7*SZFREG
>+#endif
>+
>+ ADDI sp, sp, FRAME_SIZE
>+
>+ /* Invoke the callee. */
>+ jirl zero, t1, 0
>+END (_dl_runtime_resolve)
>diff --git a/sysdeps/loongarch/jmpbuf-offsets.h b/sysdeps/loongarch/jmpbuf-offsets.h
>new file mode 100644
>index 0000000000..a4b8ea690e
>--- /dev/null
>+++ b/sysdeps/loongarch/jmpbuf-offsets.h
>@@ -0,0 +1,22 @@
>+/* Private macros for accessing __jmp_buf contents.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public License as
>+ published by the Free Software Foundation; either version 2.1 of the
>+ License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#include <jmpbuf-unwind.h>
>+
>+/* Helper for generic ____longjmp_chk(). */
>+#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>diff --git a/sysdeps/loongarch/jmpbuf-unwind.h b/sysdeps/loongarch/jmpbuf-unwind.h
>new file mode 100644
>index 0000000000..6fa509151d
>--- /dev/null
>+++ b/sysdeps/loongarch/jmpbuf-unwind.h
>@@ -0,0 +1,45 @@
>+/* Examine __jmp_buf for unwinding frames.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#include <setjmp.h>
>+#include <stdint.h>
>+#include <unwind.h>
>+#include <sysdep.h>
>+
>+/* Test if longjmp to JMPBUF would unwind the frame
>+ containing a local variable at ADDRESS. */
>+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>+ ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>+
>+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>+ _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
>+
>+static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp (__jmp_buf regs)
>+{
>+ uintptr_t sp = regs[0].__sp;
>+#ifdef PTR_DEMANGLE
>+ PTR_DEMANGLE (sp);
>+#endif
>+ return sp;
>+}
>+
>+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>+ ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>+
>+/* We use the normal longjmp for unwinding. */
>+#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>diff --git a/sysdeps/loongarch/ldsodefs.h b/sysdeps/loongarch/ldsodefs.h
>new file mode 100644
>index 0000000000..36b1b25b9f
>--- /dev/null
>+++ b/sysdeps/loongarch/ldsodefs.h
>@@ -0,0 +1,41 @@
>+/* Run-time dynamic linker data structures for loaded ELF shared objects.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#ifndef _LOONGARCH_LDSODEFS_H
>+#define _LOONGARCH_LDSODEFS_H 1
>+
>+#include <elf.h>
>+
>+struct La_loongarch_regs;
>+struct La_loongarch_retval;
>+
>+#define ARCH_PLTENTER_MEMBERS \
>+ ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
>+ uintptr_t *, uintptr_t *, \
>+ const struct La_loongarch_regs *, \
>+ unsigned int *, const char *name, \
>+ long int *framesizep);
>+
>+#define ARCH_PLTEXIT_MEMBERS \
>+ unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
>+ uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>+ struct La_loongarch_retval *, const char *);
>+
>+#include_next <ldsodefs.h>
>+
>+#endif
>diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>new file mode 100644
>index 0000000000..bbba73ed70
>--- /dev/null
>+++ b/sysdeps/loongarch/linkmap.h
>@@ -0,0 +1,22 @@
>+/* Definition of link_map_machine.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+struct link_map_machine
>+{
>+ ElfW (Addr) plt; /* Address of .plt. */
>+};
>diff --git a/sysdeps/loongarch/machine-gmon.h b/sysdeps/loongarch/machine-gmon.h
>new file mode 100644
>index 0000000000..4a3cdd964e
>--- /dev/null
>+++ b/sysdeps/loongarch/machine-gmon.h
>@@ -0,0 +1,37 @@
>+/* LoongArch definitions for profiling support.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library; if not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+/* Accept 'frompc' address as argument from the function that calls
>+ _mcount for profiling. Use __builtin_return_address (0)
>+ for the 'selfpc' address. */
>+
>+#include <sysdep.h>
>+
>+static void mcount_internal (unsigned long int frompc,
>+ unsigned long int selfpc);
>+
>+#define _MCOUNT_DECL(frompc, selfpc) \
>+ static inline void mcount_internal (unsigned long int frompc, \
>+ unsigned long int selfpc)
>+
>+#define MCOUNT \
>+ void _mcount (void *frompc) \
>+ { \
>+ mcount_internal ((unsigned long int) frompc, \
>+ (unsigned long int) RETURN_ADDRESS (0)); \
>+ }
>diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>new file mode 100644
>index 0000000000..b93ae2f5da
>--- /dev/null
>+++ b/sysdeps/loongarch/setjmp.S
>@@ -0,0 +1,66 @@
>+/* setjmp for LoongArch.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#include <sysdep.h>
>+#include <sys/asm.h>
>+
>+ENTRY (_setjmp)
>+ li.w a1,0
>+ b __sigsetjmp
>+END (_setjmp)
>+
>+ENTRY (setjmp)
>+ li.w a1,1
>+END (setjmp)
>+
>+ENTRY (__sigsetjmp)
>+ REG_S ra, a0, 0*SZREG
>+ REG_S sp, a0, 1*SZREG
>+ REG_S x, a0, 2*SZREG
>+ REG_S fp, a0, 3*SZREG
>+ REG_S s0, a0, 4*SZREG
>+ REG_S s1, a0, 5*SZREG
>+ REG_S s2, a0, 6*SZREG
>+ REG_S s3, a0, 7*SZREG
>+ REG_S s4, a0, 8*SZREG
>+ REG_S s5, a0, 9*SZREG
>+ REG_S s6, a0, 10*SZREG
>+ REG_S s7, a0, 11*SZREG
>+ REG_S s8, a0, 12*SZREG
>+
>+#ifndef __loongarch_soft_float
>+ FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>+ FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>+ FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>+ FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>+ FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>+ FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>+ FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>+ FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>+#endif
>+
>+#if !IS_IN (libc) && IS_IN(rtld)
>+ li.w v0, 0
>+ jirl zero,ra,0
>+#else
>+ b __sigjmp_save
>+#endif
>+END (__sigsetjmp)
>+
>+hidden_def (__sigsetjmp)
>+weak_alias (_setjmp, __GI__setjmp)
>diff --git a/sysdeps/loongarch/sotruss-lib.c b/sysdeps/loongarch/sotruss-lib.c
>new file mode 100644
>index 0000000000..5b15f4815a
>--- /dev/null
>+++ b/sysdeps/loongarch/sotruss-lib.c
>@@ -0,0 +1,50 @@
>+/* Override generic sotruss-lib.c to define actual functions for LoongArch.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#define HAVE_ARCH_PLTENTER
>+#define HAVE_ARCH_PLTEXIT
>+
>+#include <elf/sotruss-lib.c>
>+
>+ElfW (Addr)
>+la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>+ unsigned int ndx __attribute__ ((unused)),
>+ uintptr_t *refcook, uintptr_t *defcook,
>+ La_loongarch_regs *regs, unsigned int *flags,
>+ const char *symname, long int *framesizep)
>+{
>+ print_enter (refcook, defcook, symname, regs->lr_reg[0], regs->lr_reg[1],
>+ regs->lr_reg[2], *flags);
>+
>+ /* No need to copy anything, we will not need the parameters in any case. */
>+ *framesizep = 0;
>+
>+ return sym->st_value;
>+}
>+
>+unsigned int
>+la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>+ uintptr_t *refcook, uintptr_t *defcook,
>+ const struct La_loongarch_regs *inregs,
>+ struct La_loongarch_retval *outregs,
>+ const char *symname)
>+{
>+ print_exit (refcook, defcook, symname, outregs->lrv_a0);
>+
>+ return 0;
>+}
>diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>new file mode 100644
>index 0000000000..a9b32aa966
>--- /dev/null
>+++ b/sysdeps/loongarch/start.S
>@@ -0,0 +1,67 @@
>+/* Startup code compliant to the ELF LoongArch ABI.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#define __ASSEMBLY__ 1
>+#include <entry.h>
>+#include <sys/asm.h>
>+
>+/* The entry point's job is to call __libc_start_main. Per the ABI,
>+ a0 contains the address of a function to be passed to atexit.
>+ __libc_start_main wants this in a5. */
>+
>+/*
>+int
>+__libc_start_main (int (*main) (int, char **, char **),
>+ int argc,
>+ char **argv,
>+ __typeof (main) init,
>+ void (*fini) (void),
>+ void (*rtld_fini) (void),
>+ void *stack_end);
>+ */
>+
>+ENTRY (ENTRY_POINT)
>+
>+/* Terminate call stack by noting ra is undefined. Use a dummy
>+ .cfi_label to force starting the FDE. */
>+ .cfi_label .Ldummy
>+ cfi_undefined (1)
>+ or a5, a0, zero /* rtld_fini */
>+
>+/* We must get symbol main through GOT table, since main may not be local.
>+ For instance: googletest defines main in dynamic library. */
>+ la.got a0, t0, main
>+ REG_L a1, sp, 0
>+ ADDI a2, sp, SZREG
>+
>+ /* Adjust $sp for 16-aligned */
>+ SRLI sp, sp, 4
>+ SLLI sp, sp, 4
>+
>+ move a3, zero /* used to be init */
>+ move a4, zero /* used to be fini */
>+ or a6, sp, zero /* stack_end */
>+
>+ la.got ra, t0, __libc_start_main
>+ jirl ra, ra, 0
>+
>+ la.got ra, t0, abort
>+ jirl ra, ra, 0
>+END (ENTRY_POINT)
>+
>diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>new file mode 100644
>index 0000000000..b41ee59694
>--- /dev/null
>+++ b/sysdeps/loongarch/sys/asm.h
>@@ -0,0 +1,59 @@
>+/* Miscellaneous macros.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#ifndef _SYS_ASM_H
>+#define _SYS_ASM_H
>+
>+#include <sys/regdef.h>
>+#include <sysdeps/generic/sysdep.h>
>+
>+/* Macros to handle different pointer/register sizes for 32/64-bit code. */
>+#define SZREG 8
>+#define SZFREG 8
>+#define REG_L ld.d
>+#define REG_S st.d
>+#define SRLI srli.d
>+#define SLLI slli.d
>+#define ADDI addi.d
>+#define ADD add.d
>+#define BSTRINS bstrins.d
>+#define LI li.d
>+#define FREG_L fld.d
>+#define FREG_S fst.d
>+
>+/* Declare leaf routine. */
>+#define LEAF(symbol) \
>+ .text; \
>+ .globl symbol; \
>+ .align 3; \
>+ cfi_startproc; \
>+ .type symbol, @function; \
>+ symbol:
>+
>+#define ENTRY(symbol) LEAF (symbol)
>+
>+/* Mark end of function. */
>+#undef END
>+#define END(function) \
>+ cfi_endproc; \
>+ .size function, .- function;
>+
>+/* Stack alignment. */
>+#define ALMASK ~15
>+
>+#endif /* sys/asm.h */
>diff --git a/sysdeps/loongarch/tst-audit.h b/sysdeps/loongarch/tst-audit.h
>new file mode 100644
>index 0000000000..e71948c86e
>--- /dev/null
>+++ b/sysdeps/loongarch/tst-audit.h
>@@ -0,0 +1,23 @@
>+/* Definitions for testing PLT entry/exit auditing.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <https://www.gnu.org/licenses/>. */
>+
>+#define pltenter la_loongarch_gnu_pltenter
>+#define pltexit la_loongarch_gnu_pltexit
>+#define La_regs La_loongarch_regs
>+#define La_retval La_loongarch_retval
>+#define int_retval lrv_a0
>diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>new file mode 100644
>index 0000000000..4887c30ca2
>--- /dev/null
>+++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>@@ -0,0 +1,26 @@
>+/* ldconfig default paths and libraries.
>+ Copyright (C) 2022 Free Software Foundation, Inc.
>+ This file is part of the GNU C Library.
>+
>+ The GNU C Library is free software; you can redistribute it and/or
>+ modify it under the terms of the GNU Lesser General Public
>+ License as published by the Free Software Foundation; either
>+ version 2.1 of the License, or (at your option) any later version.
>+
>+ The GNU C Library is distributed in the hope that it will be useful,
>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>+ Lesser General Public License for more details.
>+
>+ You should have received a copy of the GNU Lesser General Public
>+ License along with the GNU C Library. If not, see
>+ <http://www.gnu.org/licenses/>. */
>+
>+#include <sysdeps/generic/ldconfig.h>
>+
>+#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>+ { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>+
>+#define SYSDEP_KNOWN_LIBRARY_NAMES \
>+ { "libc.so.6", FLAG_ELF_LIBC6 }, \
>+ { "libm.so.6", FLAG_ELF_LIBC6 },
>--
>2.31.1
>
+
+#define elf_machine_type_class(type) \
+ ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
seems an unneeded hack for many ports. Can you check does loongarch
really need them?
*Removed*.
*>>>>>>>>>>>>>>>*
diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
index 3beaaee117..500fe71a7e 100644
--- a/sysdeps/loongarch/dl-machine.h
+++ b/sysdeps/loongarch/dl-machine.h
@@ -47,13 +47,7 @@
#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
#define elf_machine_type_class(type) \
- ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT \
- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
+ ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
| (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
#define ELF_MACHINE_NO_REL 1
*<<<<<<<<<<<<<<<<<<*
*
*
+#define RTLD_START \
+ asm(".text\n\
+ " _RTLD_PROLOGUE (ENTRY_POINT) "\
+ .cfi_label .Ldummy \n\
+ " CFI_UNDEFINED (1) " \n\
+ or $a0, $sp, $zero \n\
+ bl _dl_start \n\
+ # Stash user entry point in s0. \n\
+ or $s0, $v0, $zero \n\
+ # Load the original argument count. \n\
+ ld.d $a1, $sp, 0 \n\
+ # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
+ char **env) \n\
+ la $a0, _rtld_local \n\
+ ld.d $a0, $a0, 0 \n\
+ addi.d $a2, $sp, 8 \n\
+ slli.d $a3, $a1, 3 \n\
+ add.d $a3, $a3, $a2 \n\
+ addi.d $a3, $a3, 8 \n\
The _dl_init seems much more complex than the riscv counterpart.
*There is no need to simplify further.*
>>>>>>>>>>>>>>>>>>
loongarch:
96 # Call _dl_init (struct link_map *main_map, int argc, char
**argv, \
97 char **env) \n\
* 98 la $a0, _rtld_local \n\
99 ld.d $a0, $a0, 0 \n\ *
*100 addi.d $a2, $sp, 8 \n\ **
**101 slli.d $a3, $a1, 3 \n\ **
**102 add.d $a3, $a3, $a2 \n\ **
**103 addi.d $a3, $a3, 8 \n\*
104 # Stash the stack pointer in s1.\n\
riscv:
112 # Call _dl_init (struct link_map *main_map, int argc, char
**argv, char **env) \n\
*113 " STRINGXP (REG_L) " a0, _rtld_local\n\*
*114 add a2, sp, " STRINGXP (SZREG) "\n\**
**115 sll a3, a1, " STRINGXP (PTRLOG) "\n\**
**116 add a3, a3, a2\n\**
**117 add a3, a3, " STRINGXP (SZREG) "\n\*
118 # Stash the stack pointer in s1.\n\
<<<<<<<<<<<<<<
> + # Adjust $sp for 16-aligned \n\
> + srli.d $t0, $sp, 4 \n\
> + slli.d $t0, $t0, 4 \n\
> + ori $t1, $sp, 0 \n\
> + addi.d $sp, $t0, -32 \n\
> + st.d $t1, $sp, 24 \n\
Seems too complex.
*Fixed.*
*>>>>>>>>>>>>>>>>>>>*
*diff --git a/sysdeps/loongarch/dl-machine.h
b/sysdeps/loongarch/dl-machine.h
index 500fe71a7e..6ec9a403d3 100644
--- a/sysdeps/loongarch/dl-machine.h
+++ b/sysdeps/loongarch/dl-machine.h
@@ -101,16 +101,15 @@ static inline ElfW (Addr) elf_machine_dynamic (void)
slli.d $a3, $a1, 3 \n\
add.d $a3, $a3, $a2 \n\
addi.d $a3, $a3, 8 \n\
+ # Stash the stack pointer in s1.\n\
+ or $s1, $sp, $zero \n\
# Adjust $sp for 16-aligned \n\
- srli.d $t0, $sp, 4 \n\
- slli.d $t0, $t0, 4 \n\
- ori $t1, $sp, 0 \n\
- addi.d $sp, $t0, -32 \n\
- st.d $t1, $sp, 24 \n\
+ bstrins.d $sp, $zero, 3, 0 \n\
# Call the function to run the initializers. \n\
bl _dl_init \n\
+ # Restore the stack pointer for _start.\n\
+ or $sp, $s1, $zero \n\
# Pass our finalizer function to _start. \n\
- ld.d $sp, $sp, 24 \n\
la $a0, _dl_fini \n\
# Jump to the user entry point. \n\
jirl $zero, $s0, 0 \n\
*
*<<<<<<<<<<<<<<<<<<*
+static inline void __attribute__ ((always_inline))
+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
+ const ElfW (Rela) * reloc,
+ const ElfW (Sym) * sym,
Seems excess space after `*`
*Fixed all same problems.*
+ /* Check for unexpected PLT reloc type. */
+ if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
+ {
+ if (__glibc_unlikely (map->l_mach.plt == 0))
+ {
+ if (l_addr)
+ *reloc_addr += l_addr;
+ }
+ else
+ *reloc_addr = map->l_mach.plt;
+ }
+ else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
This is a design issue of ifunc for many ports.
Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
.rela.plt, then you can remove this branch.
*Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs
in their **.rela.plt.*
*But I don't understand why "Ideally R_*_IRELATIVE relocations are only
in .rela.dyn"?*
*Could you explain it?*
*or we just keep it now?
*
*Thanks.*
*
*
在 2022/6/6 上午7:55, Fangrui Song 写道:
> On 2022-06-01, caiyinyu wrote:
>> ---
>> sysdeps/loongarch/__longjmp.S | 52 ++++
>> sysdeps/loongarch/bits/endianness.h | 11 +
>> sysdeps/loongarch/bits/link.h | 58 ++++
>> sysdeps/loongarch/bits/setjmp.h | 42 +++
>> sysdeps/loongarch/bsd-_setjmp.c | 1 +
>> sysdeps/loongarch/bsd-setjmp.c | 1 +
>> sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
>> sysdeps/loongarch/dl-trampoline.S | 91 ++++++
>> sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
>> sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
>> sysdeps/loongarch/ldsodefs.h | 41 +++
>> sysdeps/loongarch/linkmap.h | 22 ++
>> sysdeps/loongarch/machine-gmon.h | 37 +++
>> sysdeps/loongarch/setjmp.S | 66 ++++
>> sysdeps/loongarch/sotruss-lib.c | 50 +++
>> sysdeps/loongarch/start.S | 67 ++++
>> sysdeps/loongarch/sys/asm.h | 59 ++++
>> sysdeps/loongarch/tst-audit.h | 23 ++
>> sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
>> 19 files changed, 1021 insertions(+)
>> create mode 100644 sysdeps/loongarch/__longjmp.S
>> create mode 100644 sysdeps/loongarch/bits/endianness.h
>> create mode 100644 sysdeps/loongarch/bits/link.h
>> create mode 100644 sysdeps/loongarch/bits/setjmp.h
>> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
>> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
>> create mode 100644 sysdeps/loongarch/dl-machine.h
>> create mode 100644 sysdeps/loongarch/dl-trampoline.S
>> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
>> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
>> create mode 100644 sysdeps/loongarch/ldsodefs.h
>> create mode 100644 sysdeps/loongarch/linkmap.h
>> create mode 100644 sysdeps/loongarch/machine-gmon.h
>> create mode 100644 sysdeps/loongarch/setjmp.S
>> create mode 100644 sysdeps/loongarch/sotruss-lib.c
>> create mode 100644 sysdeps/loongarch/start.S
>> create mode 100644 sysdeps/loongarch/sys/asm.h
>> create mode 100644 sysdeps/loongarch/tst-audit.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>
>> diff --git a/sysdeps/loongarch/__longjmp.S
>> b/sysdeps/loongarch/__longjmp.S
>> new file mode 100644
>> index 0000000000..b7690dd94f
>> --- /dev/null
>> +++ b/sysdeps/loongarch/__longjmp.S
>> @@ -0,0 +1,52 @@
>> +/* longjmp.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +ENTRY (__longjmp)
>> + REG_L ra, a0, 0*SZREG
>> + REG_L sp, a0, 1*SZREG
>> + REG_L x, a0, 2*SZREG
>> + REG_L fp, a0, 3*SZREG
>> + REG_L s0, a0, 4*SZREG
>> + REG_L s1, a0, 5*SZREG
>> + REG_L s2, a0, 6*SZREG
>> + REG_L s3, a0, 7*SZREG
>> + REG_L s4, a0, 8*SZREG
>> + REG_L s5, a0, 9*SZREG
>> + REG_L s6, a0, 10*SZREG
>> + REG_L s7, a0, 11*SZREG
>> + REG_L s8, a0, 12*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>> + FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>> + FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>> + FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>> + FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>> + FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>> + FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>> + FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>> +#endif
>> +
>> + sltui a0,a1,1
>> + ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
>> + jirl zero,ra,0
>> +
>> +END (__longjmp)
>> diff --git a/sysdeps/loongarch/bits/endianness.h
>> b/sysdeps/loongarch/bits/endianness.h
>> new file mode 100644
>> index 0000000000..7290be7b18
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/endianness.h
>> @@ -0,0 +1,11 @@
>> +#ifndef _BITS_ENDIANNESS_H
>> +#define _BITS_ENDIANNESS_H 1
>> +
>> +#ifndef _BITS_ENDIAN_H
>> +#error "Never use <bits/endianness.h> directly; include <endian.h>
>> instead."
>> +#endif
>> +
>> +/* LoongArch is little-endian. */
>> +#define __BYTE_ORDER __LITTLE_ENDIAN
>> +
>> +#endif /* bits/endianness.h */
>> diff --git a/sysdeps/loongarch/bits/link.h
>> b/sysdeps/loongarch/bits/link.h
>> new file mode 100644
>> index 0000000000..4df09989cb
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/link.h
>> @@ -0,0 +1,58 @@
>> +/* Machine-specific declarations for dynamic linker interface.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LINK_H
>> +#error "Never include <bits/link.h> directly; use <link.h> instead."
>> +#endif
>> +
>> +typedef struct La_loongarch_regs
>> +{
>> + unsigned long int lr_reg[8]; /* a0 - a7 */
>> + double lr_fpreg[8]; /* fa0 - fa7 */
>> + unsigned long int lr_ra;
>> + unsigned long int lr_sp;
>> +} La_loongarch_regs;
>> +
>> +/* Return values for calls from PLT on LoongArch. */
>> +typedef struct La_loongarch_retval
>> +{
>> + unsigned long int lrv_a0;
>> + unsigned long int lrv_a1;
>> + double lrv_fa0;
>> + double lrv_fa1;
>> +} La_loongarch_retval;
>> +
>> +__BEGIN_DECLS
>> +
>> +extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>> + unsigned int __ndx,
>> + uintptr_t *__refcook,
>> + uintptr_t *__defcook,
>> + La_loongarch_regs *__regs,
>> + unsigned int *__flags,
>> + const char *__symname,
>> + long int *__framesizep);
>> +extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>> + unsigned int __ndx,
>> + uintptr_t *__refcook,
>> + uintptr_t *__defcook,
>> + const La_loongarch_regs *__inregs,
>> + La_loongarch_retval *__outregs,
>> + const char *__symname);
>> +
>> +__END_DECLS
>> diff --git a/sysdeps/loongarch/bits/setjmp.h
>> b/sysdeps/loongarch/bits/setjmp.h
>> new file mode 100644
>> index 0000000000..8b323ad2b6
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/setjmp.h
>> @@ -0,0 +1,42 @@
>> +/* Define the machine-dependent type `jmp_buf'.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LOONGARCH_BITS_SETJMP_H
>> +#define _LOONGARCH_BITS_SETJMP_H
>> +
>> +typedef struct __jmp_buf_internal_tag
>> +{
>> + /* Program counter. */
>> + long int __pc;
>> + /* Stack pointer. */
>> + long int __sp;
>> + /* Reserved */
>> + long int __x;
>> + /* Frame pointer. */
>> + long int __fp;
>> + /* Callee-saved registers. */
>> + long int __regs[9];
>> +
>> +#ifndef __loongarch_soft_float
>> + /* Callee-saved floating point registers. */
>> + double __fpregs[8];
>> +#endif
>> +
>> +} __jmp_buf[1];
>> +
>> +#endif /* _LOONGARCH_BITS_SETJMP_H */
>> diff --git a/sysdeps/loongarch/bsd-_setjmp.c
>> b/sysdeps/loongarch/bsd-_setjmp.c
>> new file mode 100644
>> index 0000000000..32f49441c3
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bsd-_setjmp.c
>> @@ -0,0 +1 @@
>> +/* _setjmp is implemented in setjmp.S. */
>> diff --git a/sysdeps/loongarch/bsd-setjmp.c
>> b/sysdeps/loongarch/bsd-setjmp.c
>> new file mode 100644
>> index 0000000000..45fd802aac
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bsd-setjmp.c
>> @@ -0,0 +1 @@
>> +/* setjmp is implemented in setjmp.S. */
>> diff --git a/sysdeps/loongarch/dl-machine.h
>> b/sysdeps/loongarch/dl-machine.h
>> new file mode 100644
>> index 0000000000..4e19ad9319
>> --- /dev/null
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -0,0 +1,307 @@
>> +/* Machine-dependent ELF dynamic relocation inline functions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef dl_machine_h
>> +#define dl_machine_h
>> +
>> +#define ELF_MACHINE_NAME "LoongArch"
>> +
>> +#include <entry.h>
>> +#include <elf/elf.h>
>> +#include <sys/asm.h>
>> +#include <dl-tls.h>
>> +#include <dl-static-tls.h>
>> +#include <dl-machine-rel.h>
>> +
>> +#ifndef _RTLD_PROLOGUE
>> +# define _RTLD_PROLOGUE(entry) \
>> + ".globl\t" __STRING (entry) "\n\t" \
>> + ".type\t" __STRING (entry) ", @function\n\t" \
>> + CFI_STARTPROC "\n" \
>> + __STRING (entry) ":\n"
>> +#endif
>> +
>> +#ifndef _RTLD_EPILOGUE
>> +# define _RTLD_EPILOGUE(entry) \
>> + CFI_ENDPROC "\n\t" \
>> + ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>> +#endif
>> +
>> +#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>> +#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>> +
>> +#define elf_machine_type_class(type) \
>> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>
> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
> seems an unneeded hack for many ports. Can you check does loongarch
> really need them?
>
>> + | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>> +
>> +#define ELF_MACHINE_NO_REL 1
>> +#define ELF_MACHINE_NO_RELA 0
>> +
>> +/* Return nonzero iff ELF header is compatible with the running
>> host. */
>> +static inline int
>> +elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>> +{
>> + /* We can only run LoongArch binaries. */
>> + if (ehdr->e_machine != EM_LOONGARCH)
>> + return 0;
>> +
>> + return 1;
>> +}
>> +
>> +/* Return the run-time load address of the shared object. */
>> +static inline ElfW (Addr) elf_machine_load_address (void)
>> +{
>> + extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>> + return (ElfW(Addr)) &__ehdr_start;
>> +}
>> +
>> +/* Return the link-time address of _DYNAMIC. */
>> +static inline ElfW (Addr) elf_machine_dynamic (void)
>> +{
>> + extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>> + return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>> +}
>> +
>> +/* Initial entry point code for the dynamic linker.
>> + The C function `_dl_start' is the real entry point;
>> + its return value is the user program's entry point. */
>> +
>> +#define RTLD_START \
>> + asm(".text\n\
>> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
>> + .cfi_label .Ldummy \n\
>> + " CFI_UNDEFINED (1) " \n\
>> + or $a0, $sp, $zero \n\
>> + bl _dl_start \n\
>> + # Stash user entry point in s0. \n\
>> + or $s0, $v0, $zero \n\
>> + # Load the original argument count. \n\
>> + ld.d $a1, $sp, 0 \n\
>> + # Call _dl_init (struct link_map *main_map, int argc, char
>> **argv, \
>> + char **env) \n\
>> + la $a0, _rtld_local \n\
>> + ld.d $a0, $a0, 0 \n\
>> + addi.d $a2, $sp, 8 \n\
>> + slli.d $a3, $a1, 3 \n\
>> + add.d $a3, $a3, $a2 \n\
>> + addi.d $a3, $a3, 8 \n\
>
> The _dl_init seems much more complex than the riscv counterpart.
>
>> + # Adjust $sp for 16-aligned \n\
>> + srli.d $t0, $sp, 4 \n\
>> + slli.d $t0, $t0, 4 \n\
>> + ori $t1, $sp, 0 \n\
>> + addi.d $sp, $t0, -32 \n\
>> + st.d $t1, $sp, 24 \n\
>
> Seems too complex.
>
>> + # Call the function to run the initializers. \n\
>> + bl _dl_init \n\
>> + # Pass our finalizer function to _start. \n\
>> + ld.d $sp, $sp, 24 \n\
>> + la $a0, _dl_fini \n\
>> + # Jump to the user entry point. \n\
>> + jirl $zero, $s0, 0 \n\
>> + " _RTLD_EPILOGUE (ENTRY_POINT) "\
>> + .previous");
>> +
>> +/* Names of the architecture-specific auditing callback functions. */
>> +#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>> +#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>> +
>> +/* Bias .got.plt entry by the offset requested by the PLT header. */
>> +#define elf_machine_plt_value(map, reloc, value) (value)
>> +
>> +static inline ElfW (Addr)
>> +elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>> + const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>> + const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>> + ElfW (Addr) value)
>> +{
>> + return *reloc_addr = value;
>> +}
>> +
>> +#endif /* !dl_machine_h */
>> +
>> +#ifdef RESOLVE_MAP
>> +
>> +/* Perform a relocation described by R_INFO at the location pointed to
>> + by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
>> + MAP is the object containing the reloc. */
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>> + const ElfW (Rela) * reloc,
>> + const ElfW (Sym) * sym,
>
> Seems excess space after `*`
>
>> + const struct r_found_version *version,
>> + void *const reloc_addr, int skip_ifunc)
>> +{
>> + ElfW (Addr) r_info = reloc->r_info;
>> + const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>> + ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>> + const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>> + struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
>> r_type);
>> + ElfW (Addr) value = 0;
>> + if (sym_map != NULL)
>> + value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>> +
>> + if (sym != NULL
>> + && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) ==
>> STT_GNU_IFUNC)
>> + && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>> + && __glibc_likely (!skip_ifunc))
>> + value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>> +
>> + switch (r_type)
>> + {
>> +#ifndef RTLD_BOOTSTRAP
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>> + R_LARCH_TLS_DTPMOD32:
>> + if (sym_map)
>> + *addr_field = sym_map->l_tls_modid;
>> + break;
>
> I know many ports do `if (sym_map)` but that seems (a) a workaround
> for possibly
> GNU ld bugs or (b) unneeded cargo cult.
>
> The check should better be removed.
>
> This applies to various TLS dynamic relocations below.
>
>> +
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>> + R_LARCH_TLS_DTPREL32:
>> + if (sym != NULL)
>> + *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>> + break;
>> +
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>> + R_LARCH_TLS_TPREL32:
>> + if (sym != NULL)
>> + {
>> + CHECK_STATIC_TLS (map, sym_map);
>> + *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>> + }
>> + break;
>> +
>> + case R_LARCH_COPY:
>> + {
>> + if (sym == NULL)
>> + /* This can happen in trace mode if an object could not be
>> + found. */
>> + break;
>> + if (__glibc_unlikely (sym->st_size > refsym->st_size)
>> + || (__glibc_unlikely (sym->st_size < refsym->st_size)
>> + && GLRO(dl_verbose)))
>> + {
>> + const char *strtab;
>> +
>> + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>> + _dl_error_printf ("\
>> +%s: Symbol `%s' has different size in shared object, consider
>> re-linking\n",
>> + rtld_progname ?: "<program name unknown>",
>> + strtab + refsym->st_name);
>> + }
>> + memcpy (reloc_addr, (void *) value,
>> + MIN (sym->st_size, refsym->st_size));
>> + break;
>> + }
>> +#endif
>> +
>> +#if !defined RTLD_BOOTSTRAP
>> + case R_LARCH_RELATIVE:
>> + *addr_field = map->l_addr + reloc->r_addend;
>> + break;
>> +#endif
>
> I think this is copied from riscv but its relocation code is probably
> not the best reference. sysdeps/m68k/dl-machine.h may be one of the
> better implementations for the relocation switch table.
>
> In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
> needed in this function. There should be none of NONE, RELATIVE,
> IRELATIVE, absolute relocation types, etc (RELATIVE is handled
> elsewhere).
>
> GNU ld, in the presence of a bug, may produce spurious NONE relocations.
> Not handling NONE can catch some bugs.
>
>> + case R_LARCH_JUMP_SLOT:
>> + case __WORDSIZE == 64 ? R_LARCH_64:
>> + R_LARCH_32:
>> + *addr_field = value;
>> + break;
>> +
>> + case R_LARCH_IRELATIVE:
>> + value = map->l_addr + reloc->r_addend;
>> + if (__glibc_likely (!skip_ifunc))
>> + value = ((ElfW (Addr) (*) (void)) value) ();
>> + *addr_field = value;
>> + break;
>> +
>> + case R_LARCH_NONE:
>> + break;
>> +
>> + default:
>> + _dl_reloc_bad_type (map, r_type, 0);
>> + break;
>> + }
>> +}
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) *
>> reloc,
>> + void *const reloc_addr)
>> +{
>> + *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>> +}
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem
>> *scope[],
>> + ElfW (Addr) l_addr,
>> + const ElfW (Rela) * reloc, int skip_ifunc)
>> +{
>> + ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
>> + const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>> +
>> + /* Check for unexpected PLT reloc type. */
>> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>> + {
>> + if (__glibc_unlikely (map->l_mach.plt == 0))
>> + {
>> + if (l_addr)
>> + *reloc_addr += l_addr;
>> + }
>> + else
>> + *reloc_addr = map->l_mach.plt;
>> + }
>> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>> + {
>> + ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>> + if (__glibc_likely (!skip_ifunc))
>> + value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>> + *reloc_addr = (ElfW (Addr)) value;
>> + }
>> + else
>> + _dl_reloc_bad_type (map, r_type, 1);
>> +}
>> +
>> +/* Set up the loaded object described by L so its stub function
>> + will jump to the on-demand fixup code __dl_runtime_resolve. */
>> +
>> +static inline int __attribute__ ((always_inline))
>> +elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem
>> *scope[],
>> + int lazy, int profile)
>> +{
>> +#ifndef RTLD_BOOTSTRAP
>> + /* If using PLTs, fill in the first two entries of .got.plt. */
>> + if (l->l_info[DT_JMPREL])
>> + {
>> + extern void _dl_runtime_resolve (void)
>> + __attribute__ ((visibility ("hidden")));
>> + ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l,
>> l_info[DT_PLTGOT]);
>> + gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>> + gotplt[1] = (ElfW (Addr)) l;
>> + }
>> +#endif
>> +
>> + return lazy;
>> +}
>> +
>> +#endif /* RESOLVE_MAP */
>> diff --git a/sysdeps/loongarch/dl-trampoline.S
>> b/sysdeps/loongarch/dl-trampoline.S
>> new file mode 100644
>> index 0000000000..eb610392f6
>> --- /dev/null
>> +++ b/sysdeps/loongarch/dl-trampoline.S
>> @@ -0,0 +1,91 @@
>> +/* PLT trampolines.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +/* Assembler veneer called from the PLT header code for lazy loading.
>> + The PLT header passes its own args in t0-t2. */
>> +
>> +#ifdef __loongarch_soft_float
>> +# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>> +#else
>> +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>> +#endif
>> +
>> +ENTRY (_dl_runtime_resolve)
>> +
>> + /* Save arguments to stack. */
>> + ADDI sp, sp, -FRAME_SIZE
>> +
>> + REG_S ra, sp, 9*SZREG
>> + REG_S a0, sp, 1*SZREG
>> + REG_S a1, sp, 2*SZREG
>> + REG_S a2, sp, 3*SZREG
>> + REG_S a3, sp, 4*SZREG
>> + REG_S a4, sp, 5*SZREG
>> + REG_S a5, sp, 6*SZREG
>> + REG_S a6, sp, 7*SZREG
>> + REG_S a7, sp, 8*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_S fa0, sp, 10*SZREG + 0*SZFREG
>> + FREG_S fa1, sp, 10*SZREG + 1*SZFREG
>> + FREG_S fa2, sp, 10*SZREG + 2*SZFREG
>> + FREG_S fa3, sp, 10*SZREG + 3*SZFREG
>> + FREG_S fa4, sp, 10*SZREG + 4*SZFREG
>> + FREG_S fa5, sp, 10*SZREG + 5*SZFREG
>> + FREG_S fa6, sp, 10*SZREG + 6*SZFREG
>> + FREG_S fa7, sp, 10*SZREG + 7*SZFREG
>> +#endif
>> +
>> + /* Update .got.plt and obtain runtime address of callee */
>> + SLLI a1, t1, 1
>> + or a0, t0, zero
>> + ADD a1, a1, t1
>> + la a2, _dl_fixup
>> + jirl ra, a2, 0
>> + or t1, v0, zero
>> +
>> + /* Restore arguments from stack. */
>> + REG_L ra, sp, 9*SZREG
>> + REG_L a0, sp, 1*SZREG
>> + REG_L a1, sp, 2*SZREG
>> + REG_L a2, sp, 3*SZREG
>> + REG_L a3, sp, 4*SZREG
>> + REG_L a4, sp, 5*SZREG
>> + REG_L a5, sp, 6*SZREG
>> + REG_L a6, sp, 7*SZREG
>> + REG_L a7, sp, 8*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_L fa0, sp, 10*SZREG + 0*SZFREG
>> + FREG_L fa1, sp, 10*SZREG + 1*SZFREG
>> + FREG_L fa2, sp, 10*SZREG + 2*SZFREG
>> + FREG_L fa3, sp, 10*SZREG + 3*SZFREG
>> + FREG_L fa4, sp, 10*SZREG + 4*SZFREG
>> + FREG_L fa5, sp, 10*SZREG + 5*SZFREG
>> + FREG_L fa6, sp, 10*SZREG + 6*SZFREG
>> + FREG_L fa7, sp, 10*SZREG + 7*SZFREG
>> +#endif
>> +
>> + ADDI sp, sp, FRAME_SIZE
>> +
>> + /* Invoke the callee. */
>> + jirl zero, t1, 0
>> +END (_dl_runtime_resolve)
>> diff --git a/sysdeps/loongarch/jmpbuf-offsets.h
>> b/sysdeps/loongarch/jmpbuf-offsets.h
>> new file mode 100644
>> index 0000000000..a4b8ea690e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/jmpbuf-offsets.h
>> @@ -0,0 +1,22 @@
>> +/* Private macros for accessing __jmp_buf contents.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> License as
>> + published by the Free Software Foundation; either version 2.1 of the
>> + License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <jmpbuf-unwind.h>
>> +
>> +/* Helper for generic ____longjmp_chk(). */
>> +#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>> diff --git a/sysdeps/loongarch/jmpbuf-unwind.h
>> b/sysdeps/loongarch/jmpbuf-unwind.h
>> new file mode 100644
>> index 0000000000..6fa509151d
>> --- /dev/null
>> +++ b/sysdeps/loongarch/jmpbuf-unwind.h
>> @@ -0,0 +1,45 @@
>> +/* Examine __jmp_buf for unwinding frames.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <setjmp.h>
>> +#include <stdint.h>
>> +#include <unwind.h>
>> +#include <sysdep.h>
>> +
>> +/* Test if longjmp to JMPBUF would unwind the frame
>> + containing a local variable at ADDRESS. */
>> +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>> + ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>> +
>> +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>> + _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context),
>> _adj)
>> +
>> +static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp
>> (__jmp_buf regs)
>> +{
>> + uintptr_t sp = regs[0].__sp;
>> +#ifdef PTR_DEMANGLE
>> + PTR_DEMANGLE (sp);
>> +#endif
>> + return sp;
>> +}
>> +
>> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>> + ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>> +
>> +/* We use the normal longjmp for unwinding. */
>> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>> diff --git a/sysdeps/loongarch/ldsodefs.h b/sysdeps/loongarch/ldsodefs.h
>> new file mode 100644
>> index 0000000000..36b1b25b9f
>> --- /dev/null
>> +++ b/sysdeps/loongarch/ldsodefs.h
>> @@ -0,0 +1,41 @@
>> +/* Run-time dynamic linker data structures for loaded ELF shared
>> objects.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LOONGARCH_LDSODEFS_H
>> +#define _LOONGARCH_LDSODEFS_H 1
>> +
>> +#include <elf.h>
>> +
>> +struct La_loongarch_regs;
>> +struct La_loongarch_retval;
>> +
>> +#define ARCH_PLTENTER_MEMBERS \
>> + ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
>> + uintptr_t *, uintptr_t *, \
>> + const struct La_loongarch_regs *, \
>> + unsigned int *, const char *name, \
>> + long int *framesizep);
>> +
>> +#define ARCH_PLTEXIT_MEMBERS \
>> + unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
>> + uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>> + struct La_loongarch_retval *, const char *);
>> +
>> +#include_next <ldsodefs.h>
>> +
>> +#endif
>> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>> new file mode 100644
>> index 0000000000..bbba73ed70
>> --- /dev/null
>> +++ b/sysdeps/loongarch/linkmap.h
>> @@ -0,0 +1,22 @@
>> +/* Definition of link_map_machine.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +struct link_map_machine
>> +{
>> + ElfW (Addr) plt; /* Address of .plt. */
>> +};
>> diff --git a/sysdeps/loongarch/machine-gmon.h
>> b/sysdeps/loongarch/machine-gmon.h
>> new file mode 100644
>> index 0000000000..4a3cdd964e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/machine-gmon.h
>> @@ -0,0 +1,37 @@
>> +/* LoongArch definitions for profiling support.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +/* Accept 'frompc' address as argument from the function that calls
>> + _mcount for profiling. Use __builtin_return_address (0)
>> + for the 'selfpc' address. */
>> +
>> +#include <sysdep.h>
>> +
>> +static void mcount_internal (unsigned long int frompc,
>> + unsigned long int selfpc);
>> +
>> +#define _MCOUNT_DECL(frompc, selfpc) \
>> + static inline void mcount_internal (unsigned long int frompc, \
>> + unsigned long int selfpc)
>> +
>> +#define MCOUNT \
>> + void _mcount (void *frompc) \
>> + { \
>> + mcount_internal ((unsigned long int) frompc, \
>> + (unsigned long int) RETURN_ADDRESS (0)); \
>> + }
>> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>> new file mode 100644
>> index 0000000000..b93ae2f5da
>> --- /dev/null
>> +++ b/sysdeps/loongarch/setjmp.S
>> @@ -0,0 +1,66 @@
>> +/* setjmp for LoongArch.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +ENTRY (_setjmp)
>> + li.w a1,0
>> + b __sigsetjmp
>> +END (_setjmp)
>> +
>> +ENTRY (setjmp)
>> + li.w a1,1
>> +END (setjmp)
>> +
>> +ENTRY (__sigsetjmp)
>> + REG_S ra, a0, 0*SZREG
>> + REG_S sp, a0, 1*SZREG
>> + REG_S x, a0, 2*SZREG
>> + REG_S fp, a0, 3*SZREG
>> + REG_S s0, a0, 4*SZREG
>> + REG_S s1, a0, 5*SZREG
>> + REG_S s2, a0, 6*SZREG
>> + REG_S s3, a0, 7*SZREG
>> + REG_S s4, a0, 8*SZREG
>> + REG_S s5, a0, 9*SZREG
>> + REG_S s6, a0, 10*SZREG
>> + REG_S s7, a0, 11*SZREG
>> + REG_S s8, a0, 12*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>> + FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>> + FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>> + FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>> + FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>> + FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>> + FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>> + FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>> +#endif
>> +
>> +#if !IS_IN (libc) && IS_IN(rtld)
>> + li.w v0, 0
>> + jirl zero,ra,0
>> +#else
>> + b __sigjmp_save
>> +#endif
>> +END (__sigsetjmp)
>> +
>> +hidden_def (__sigsetjmp)
>> +weak_alias (_setjmp, __GI__setjmp)
>> diff --git a/sysdeps/loongarch/sotruss-lib.c
>> b/sysdeps/loongarch/sotruss-lib.c
>> new file mode 100644
>> index 0000000000..5b15f4815a
>> --- /dev/null
>> +++ b/sysdeps/loongarch/sotruss-lib.c
>> @@ -0,0 +1,50 @@
>> +/* Override generic sotruss-lib.c to define actual functions for
>> LoongArch.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define HAVE_ARCH_PLTENTER
>> +#define HAVE_ARCH_PLTEXIT
>> +
>> +#include <elf/sotruss-lib.c>
>> +
>> +ElfW (Addr)
>> +la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>> + unsigned int ndx __attribute__ ((unused)),
>> + uintptr_t *refcook, uintptr_t *defcook,
>> + La_loongarch_regs *regs, unsigned int *flags,
>> + const char *symname, long int *framesizep)
>> +{
>> + print_enter (refcook, defcook, symname, regs->lr_reg[0],
>> regs->lr_reg[1],
>> + regs->lr_reg[2], *flags);
>> +
>> + /* No need to copy anything, we will not need the parameters in
>> any case. */
>> + *framesizep = 0;
>> +
>> + return sym->st_value;
>> +}
>> +
>> +unsigned int
>> +la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>> + uintptr_t *refcook, uintptr_t *defcook,
>> + const struct La_loongarch_regs *inregs,
>> + struct La_loongarch_retval *outregs,
>> + const char *symname)
>> +{
>> + print_exit (refcook, defcook, symname, outregs->lrv_a0);
>> +
>> + return 0;
>> +}
>> diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>> new file mode 100644
>> index 0000000000..a9b32aa966
>> --- /dev/null
>> +++ b/sysdeps/loongarch/start.S
>> @@ -0,0 +1,67 @@
>> +/* Startup code compliant to the ELF LoongArch ABI.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define __ASSEMBLY__ 1
>> +#include <entry.h>
>> +#include <sys/asm.h>
>> +
>> +/* The entry point's job is to call __libc_start_main. Per the ABI,
>> + a0 contains the address of a function to be passed to atexit.
>> + __libc_start_main wants this in a5. */
>> +
>> +/*
>> +int
>> +__libc_start_main (int (*main) (int, char **, char **),
>> + int argc,
>> + char **argv,
>> + __typeof (main) init,
>> + void (*fini) (void),
>> + void (*rtld_fini) (void),
>> + void *stack_end);
>> + */
>> +
>> +ENTRY (ENTRY_POINT)
>> +
>> +/* Terminate call stack by noting ra is undefined. Use a dummy
>> + .cfi_label to force starting the FDE. */
>> + .cfi_label .Ldummy
>> + cfi_undefined (1)
>> + or a5, a0, zero /* rtld_fini */
>> +
>> +/* We must get symbol main through GOT table, since main may not be
>> local.
>> + For instance: googletest defines main in dynamic library. */
>> + la.got a0, t0, main
>> + REG_L a1, sp, 0
>> + ADDI a2, sp, SZREG
>> +
>> + /* Adjust $sp for 16-aligned */
>> + SRLI sp, sp, 4
>> + SLLI sp, sp, 4
>> +
>> + move a3, zero /* used to be init */
>> + move a4, zero /* used to be fini */
>> + or a6, sp, zero /* stack_end */
>> +
>> + la.got ra, t0, __libc_start_main
>> + jirl ra, ra, 0
>> +
>> + la.got ra, t0, abort
>> + jirl ra, ra, 0
>> +END (ENTRY_POINT)
>> +
>> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>> new file mode 100644
>> index 0000000000..b41ee59694
>> --- /dev/null
>> +++ b/sysdeps/loongarch/sys/asm.h
>> @@ -0,0 +1,59 @@
>> +/* Miscellaneous macros.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _SYS_ASM_H
>> +#define _SYS_ASM_H
>> +
>> +#include <sys/regdef.h>
>> +#include <sysdeps/generic/sysdep.h>
>> +
>> +/* Macros to handle different pointer/register sizes for 32/64-bit
>> code. */
>> +#define SZREG 8
>> +#define SZFREG 8
>> +#define REG_L ld.d
>> +#define REG_S st.d
>> +#define SRLI srli.d
>> +#define SLLI slli.d
>> +#define ADDI addi.d
>> +#define ADD add.d
>> +#define BSTRINS bstrins.d
>> +#define LI li.d
>> +#define FREG_L fld.d
>> +#define FREG_S fst.d
>> +
>> +/* Declare leaf routine. */
>> +#define LEAF(symbol) \
>> + .text; \
>> + .globl symbol; \
>> + .align 3; \
>> + cfi_startproc; \
>> + .type symbol, @function; \
>> + symbol:
>> +
>> +#define ENTRY(symbol) LEAF (symbol)
>> +
>> +/* Mark end of function. */
>> +#undef END
>> +#define END(function) \
>> + cfi_endproc; \
>> + .size function, .- function;
>> +
>> +/* Stack alignment. */
>> +#define ALMASK ~15
>> +
>> +#endif /* sys/asm.h */
>> diff --git a/sysdeps/loongarch/tst-audit.h
>> b/sysdeps/loongarch/tst-audit.h
>> new file mode 100644
>> index 0000000000..e71948c86e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/tst-audit.h
>> @@ -0,0 +1,23 @@
>> +/* Definitions for testing PLT entry/exit auditing.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define pltenter la_loongarch_gnu_pltenter
>> +#define pltexit la_loongarch_gnu_pltexit
>> +#define La_regs La_loongarch_regs
>> +#define La_retval La_loongarch_retval
>> +#define int_retval lrv_a0
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> new file mode 100644
>> index 0000000000..4887c30ca2
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> @@ -0,0 +1,26 @@
>> +/* ldconfig default paths and libraries.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <http://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdeps/generic/ldconfig.h>
>> +
>> +#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>> + { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>> +
>> +#define SYSDEP_KNOWN_LIBRARY_NAMES \
>> + { "libc.so.6", FLAG_ELF_LIBC6 }, \
>> + { "libm.so.6", FLAG_ELF_LIBC6 },
>> --
>> 2.31.1
>>
On 2022-06-10, caiyinyu wrote:
>+
>+#define elf_machine_type_class(type) \
>+ ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>
>Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>seems an unneeded hack for many ports. Can you check does loongarch
>really need them?
>
>*Removed*.
Thanks.
>*>>>>>>>>>>>>>>>*
>
>diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
>index 3beaaee117..500fe71a7e 100644
>--- a/sysdeps/loongarch/dl-machine.h
>+++ b/sysdeps/loongarch/dl-machine.h
>@@ -47,13 +47,7 @@
> #define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>
> #define elf_machine_type_class(type) \
>- ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT \
>- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>- || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>- || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>+ ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
> | (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
>
> #define ELF_MACHINE_NO_REL 1
>
>*<<<<<<<<<<<<<<<<<<*
>
>*
>*
>
>+#define RTLD_START \
>+ asm(".text\n\
>+ " _RTLD_PROLOGUE (ENTRY_POINT) "\
>+ .cfi_label .Ldummy \n\
>+ " CFI_UNDEFINED (1) " \n\
>+ or $a0, $sp, $zero \n\
>+ bl _dl_start \n\
>+ # Stash user entry point in s0. \n\
>+ or $s0, $v0, $zero \n\
>+ # Load the original argument count. \n\
>+ ld.d $a1, $sp, 0 \n\
>+ # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
>+ char **env) \n\
>+ la $a0, _rtld_local \n\
>+ ld.d $a0, $a0, 0 \n\
>+ addi.d $a2, $sp, 8 \n\
>+ slli.d $a3, $a1, 3 \n\
>+ add.d $a3, $a3, $a2 \n\
>+ addi.d $a3, $a3, 8 \n\
>
>The _dl_init seems much more complex than the riscv counterpart.
>
>*There is no need to simplify further.*
>
Thanks.
>>>>>>>>>>>>>>>>>>>
>
>loongarch:
>
> 96 # Call _dl_init (struct link_map *main_map, int argc, char
>**argv, \
> 97 char **env) \n\
>* 98 la $a0, _rtld_local \n\
> 99 ld.d $a0, $a0, 0 \n\ *
>*100 addi.d $a2, $sp, 8 \n\ **
>**101 slli.d $a3, $a1, 3 \n\ **
>**102 add.d $a3, $a3, $a2 \n\ **
>**103 addi.d $a3, $a3, 8 \n\*
>104 # Stash the stack pointer in s1.\n\
>
>riscv:
>
>112 # Call _dl_init (struct link_map *main_map, int argc, char
>**argv, char **env) \n\
>*113 " STRINGXP (REG_L) " a0, _rtld_local\n\*
>*114 add a2, sp, " STRINGXP (SZREG) "\n\**
>**115 sll a3, a1, " STRINGXP (PTRLOG) "\n\**
>**116 add a3, a3, a2\n\**
>**117 add a3, a3, " STRINGXP (SZREG) "\n\*
>118 # Stash the stack pointer in s1.\n\
>
><<<<<<<<<<<<<<
>
>
>>+ # Adjust $sp for 16-aligned \n\
>>+ srli.d $t0, $sp, 4 \n\
>>+ slli.d $t0, $t0, 4 \n\
>>+ ori $t1, $sp, 0 \n\
>>+ addi.d $sp, $t0, -32 \n\
>>+ st.d $t1, $sp, 24 \n\
>
>Seems too complex.
>
>*Fixed.*
Thanks.
>*>>>>>>>>>>>>>>>>>>>*
>
>*diff --git a/sysdeps/loongarch/dl-machine.h
>b/sysdeps/loongarch/dl-machine.h
>index 500fe71a7e..6ec9a403d3 100644
>--- a/sysdeps/loongarch/dl-machine.h
>+++ b/sysdeps/loongarch/dl-machine.h
>@@ -101,16 +101,15 @@ static inline ElfW (Addr) elf_machine_dynamic (void)
> slli.d $a3, $a1, 3 \n\
> add.d $a3, $a3, $a2 \n\
> addi.d $a3, $a3, 8 \n\
>+ # Stash the stack pointer in s1.\n\
>+ or $s1, $sp, $zero \n\
> # Adjust $sp for 16-aligned \n\
>- srli.d $t0, $sp, 4 \n\
>- slli.d $t0, $t0, 4 \n\
>- ori $t1, $sp, 0 \n\
>- addi.d $sp, $t0, -32 \n\
>- st.d $t1, $sp, 24 \n\
>+ bstrins.d $sp, $zero, 3, 0 \n\
> # Call the function to run the initializers. \n\
> bl _dl_init \n\
>+ # Restore the stack pointer for _start.\n\
>+ or $sp, $s1, $zero \n\
> # Pass our finalizer function to _start. \n\
>- ld.d $sp, $sp, 24 \n\
> la $a0, _dl_fini \n\
> # Jump to the user entry point. \n\
> jirl $zero, $s0, 0 \n\
>*
>
>*<<<<<<<<<<<<<<<<<<*
>
>
>+static inline void __attribute__ ((always_inline))
>+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>+ const ElfW (Rela) * reloc,
>+ const ElfW (Sym) * sym,
>
>Seems excess space after `*`
>
>*Fixed all same problems.*
Thanks.
>+ /* Check for unexpected PLT reloc type. */
>+ if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>+ {
>+ if (__glibc_unlikely (map->l_mach.plt == 0))
>+ {
>+ if (l_addr)
>+ *reloc_addr += l_addr;
>+ }
>+ else
>+ *reloc_addr = map->l_mach.plt;
>+ }
>+ else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
>This is a design issue of ifunc for many ports.
>Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>.rela.plt, then you can remove this branch.
>
>
>*Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs
>in their **.rela.plt.*
>
>*But I don't understand why "Ideally R_*_IRELATIVE relocations are
>only in .rela.dyn"?*
>
>*Could you explain it?*
>
>*or we just keep it now?
>*
>
>*Thanks.*
See https://maskray.me/blog/2021-01-18-gnu-indirect-function
".rela.dyn vs .rela.plt"
Conceptually .rela.plt should only have potentially lazy resolved
relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
In the early days things were a bit messy in the implementation, so
some early ports adopting ifunc may use .rela.plt .
GNU ld's PowerPC port apperas to do the right thing.
All lld supported ports do the right thing.
>*
>*
>
>在 2022/6/6 上午7:55, Fangrui Song 写道:
>>On 2022-06-01, caiyinyu wrote:
>>>---
>>>sysdeps/loongarch/__longjmp.S | 52 ++++
>>>sysdeps/loongarch/bits/endianness.h | 11 +
>>>sysdeps/loongarch/bits/link.h | 58 ++++
>>>sysdeps/loongarch/bits/setjmp.h | 42 +++
>>>sysdeps/loongarch/bsd-_setjmp.c | 1 +
>>>sysdeps/loongarch/bsd-setjmp.c | 1 +
>>>sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
>>>sysdeps/loongarch/dl-trampoline.S | 91 ++++++
>>>sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
>>>sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
>>>sysdeps/loongarch/ldsodefs.h | 41 +++
>>>sysdeps/loongarch/linkmap.h | 22 ++
>>>sysdeps/loongarch/machine-gmon.h | 37 +++
>>>sysdeps/loongarch/setjmp.S | 66 ++++
>>>sysdeps/loongarch/sotruss-lib.c | 50 +++
>>>sysdeps/loongarch/start.S | 67 ++++
>>>sysdeps/loongarch/sys/asm.h | 59 ++++
>>>sysdeps/loongarch/tst-audit.h | 23 ++
>>>sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
>>>19 files changed, 1021 insertions(+)
>>>create mode 100644 sysdeps/loongarch/__longjmp.S
>>>create mode 100644 sysdeps/loongarch/bits/endianness.h
>>>create mode 100644 sysdeps/loongarch/bits/link.h
>>>create mode 100644 sysdeps/loongarch/bits/setjmp.h
>>>create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
>>>create mode 100644 sysdeps/loongarch/bsd-setjmp.c
>>>create mode 100644 sysdeps/loongarch/dl-machine.h
>>>create mode 100644 sysdeps/loongarch/dl-trampoline.S
>>>create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
>>>create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
>>>create mode 100644 sysdeps/loongarch/ldsodefs.h
>>>create mode 100644 sysdeps/loongarch/linkmap.h
>>>create mode 100644 sysdeps/loongarch/machine-gmon.h
>>>create mode 100644 sysdeps/loongarch/setjmp.S
>>>create mode 100644 sysdeps/loongarch/sotruss-lib.c
>>>create mode 100644 sysdeps/loongarch/start.S
>>>create mode 100644 sysdeps/loongarch/sys/asm.h
>>>create mode 100644 sysdeps/loongarch/tst-audit.h
>>>create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>
>>>diff --git a/sysdeps/loongarch/__longjmp.S
>>>b/sysdeps/loongarch/__longjmp.S
>>>new file mode 100644
>>>index 0000000000..b7690dd94f
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/__longjmp.S
>>>@@ -0,0 +1,52 @@
>>>+/* longjmp.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#include <sysdep.h>
>>>+#include <sys/asm.h>
>>>+
>>>+ENTRY (__longjmp)
>>>+ REG_L ra, a0, 0*SZREG
>>>+ REG_L sp, a0, 1*SZREG
>>>+ REG_L x, a0, 2*SZREG
>>>+ REG_L fp, a0, 3*SZREG
>>>+ REG_L s0, a0, 4*SZREG
>>>+ REG_L s1, a0, 5*SZREG
>>>+ REG_L s2, a0, 6*SZREG
>>>+ REG_L s3, a0, 7*SZREG
>>>+ REG_L s4, a0, 8*SZREG
>>>+ REG_L s5, a0, 9*SZREG
>>>+ REG_L s6, a0, 10*SZREG
>>>+ REG_L s7, a0, 11*SZREG
>>>+ REG_L s8, a0, 12*SZREG
>>>+
>>>+#ifndef __loongarch_soft_float
>>>+ FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>>>+ FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>>>+ FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>>>+ FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>>>+ FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>>>+ FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>>>+ FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>>>+ FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>>>+#endif
>>>+
>>>+ sltui a0,a1,1
>>>+ ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
>>>+ jirl zero,ra,0
>>>+
>>>+END (__longjmp)
>>>diff --git a/sysdeps/loongarch/bits/endianness.h
>>>b/sysdeps/loongarch/bits/endianness.h
>>>new file mode 100644
>>>index 0000000000..7290be7b18
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/bits/endianness.h
>>>@@ -0,0 +1,11 @@
>>>+#ifndef _BITS_ENDIANNESS_H
>>>+#define _BITS_ENDIANNESS_H 1
>>>+
>>>+#ifndef _BITS_ENDIAN_H
>>>+#error "Never use <bits/endianness.h> directly; include
>>><endian.h> instead."
>>>+#endif
>>>+
>>>+/* LoongArch is little-endian. */
>>>+#define __BYTE_ORDER __LITTLE_ENDIAN
>>>+
>>>+#endif /* bits/endianness.h */
>>>diff --git a/sysdeps/loongarch/bits/link.h
>>>b/sysdeps/loongarch/bits/link.h
>>>new file mode 100644
>>>index 0000000000..4df09989cb
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/bits/link.h
>>>@@ -0,0 +1,58 @@
>>>+/* Machine-specific declarations for dynamic linker interface.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#ifndef _LINK_H
>>>+#error "Never include <bits/link.h> directly; use <link.h> instead."
>>>+#endif
>>>+
>>>+typedef struct La_loongarch_regs
>>>+{
>>>+ unsigned long int lr_reg[8]; /* a0 - a7 */
>>>+ double lr_fpreg[8]; /* fa0 - fa7 */
>>>+ unsigned long int lr_ra;
>>>+ unsigned long int lr_sp;
>>>+} La_loongarch_regs;
>>>+
>>>+/* Return values for calls from PLT on LoongArch. */
>>>+typedef struct La_loongarch_retval
>>>+{
>>>+ unsigned long int lrv_a0;
>>>+ unsigned long int lrv_a1;
>>>+ double lrv_fa0;
>>>+ double lrv_fa1;
>>>+} La_loongarch_retval;
>>>+
>>>+__BEGIN_DECLS
>>>+
>>>+extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>>>+ unsigned int __ndx,
>>>+ uintptr_t *__refcook,
>>>+ uintptr_t *__defcook,
>>>+ La_loongarch_regs *__regs,
>>>+ unsigned int *__flags,
>>>+ const char *__symname,
>>>+ long int *__framesizep);
>>>+extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>>>+ unsigned int __ndx,
>>>+ uintptr_t *__refcook,
>>>+ uintptr_t *__defcook,
>>>+ const La_loongarch_regs *__inregs,
>>>+ La_loongarch_retval *__outregs,
>>>+ const char *__symname);
>>>+
>>>+__END_DECLS
>>>diff --git a/sysdeps/loongarch/bits/setjmp.h
>>>b/sysdeps/loongarch/bits/setjmp.h
>>>new file mode 100644
>>>index 0000000000..8b323ad2b6
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/bits/setjmp.h
>>>@@ -0,0 +1,42 @@
>>>+/* Define the machine-dependent type `jmp_buf'.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#ifndef _LOONGARCH_BITS_SETJMP_H
>>>+#define _LOONGARCH_BITS_SETJMP_H
>>>+
>>>+typedef struct __jmp_buf_internal_tag
>>>+{
>>>+ /* Program counter. */
>>>+ long int __pc;
>>>+ /* Stack pointer. */
>>>+ long int __sp;
>>>+ /* Reserved */
>>>+ long int __x;
>>>+ /* Frame pointer. */
>>>+ long int __fp;
>>>+ /* Callee-saved registers. */
>>>+ long int __regs[9];
>>>+
>>>+#ifndef __loongarch_soft_float
>>>+ /* Callee-saved floating point registers. */
>>>+ double __fpregs[8];
>>>+#endif
>>>+
>>>+} __jmp_buf[1];
>>>+
>>>+#endif /* _LOONGARCH_BITS_SETJMP_H */
>>>diff --git a/sysdeps/loongarch/bsd-_setjmp.c
>>>b/sysdeps/loongarch/bsd-_setjmp.c
>>>new file mode 100644
>>>index 0000000000..32f49441c3
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/bsd-_setjmp.c
>>>@@ -0,0 +1 @@
>>>+/* _setjmp is implemented in setjmp.S. */
>>>diff --git a/sysdeps/loongarch/bsd-setjmp.c
>>>b/sysdeps/loongarch/bsd-setjmp.c
>>>new file mode 100644
>>>index 0000000000..45fd802aac
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/bsd-setjmp.c
>>>@@ -0,0 +1 @@
>>>+/* setjmp is implemented in setjmp.S. */
>>>diff --git a/sysdeps/loongarch/dl-machine.h
>>>b/sysdeps/loongarch/dl-machine.h
>>>new file mode 100644
>>>index 0000000000..4e19ad9319
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/dl-machine.h
>>>@@ -0,0 +1,307 @@
>>>+/* Machine-dependent ELF dynamic relocation inline functions.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#ifndef dl_machine_h
>>>+#define dl_machine_h
>>>+
>>>+#define ELF_MACHINE_NAME "LoongArch"
>>>+
>>>+#include <entry.h>
>>>+#include <elf/elf.h>
>>>+#include <sys/asm.h>
>>>+#include <dl-tls.h>
>>>+#include <dl-static-tls.h>
>>>+#include <dl-machine-rel.h>
>>>+
>>>+#ifndef _RTLD_PROLOGUE
>>>+# define _RTLD_PROLOGUE(entry) \
>>>+ ".globl\t" __STRING (entry) "\n\t" \
>>>+ ".type\t" __STRING (entry) ", @function\n\t" \
>>>+ CFI_STARTPROC "\n" \
>>>+ __STRING (entry) ":\n"
>>>+#endif
>>>+
>>>+#ifndef _RTLD_EPILOGUE
>>>+# define _RTLD_EPILOGUE(entry) \
>>>+ CFI_ENDPROC "\n\t" \
>>>+ ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>>>+#endif
>>>+
>>>+#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>>>+#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>>>+
>>>+#define elf_machine_type_class(type) \
>>>+ ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>>>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>>>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>>>+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>>>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>>>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>>>+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>>
>>Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>>seems an unneeded hack for many ports. Can you check does loongarch
>>really need them?
>>
>>>+ | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>>>+
>>>+#define ELF_MACHINE_NO_REL 1
>>>+#define ELF_MACHINE_NO_RELA 0
>>>+
>>>+/* Return nonzero iff ELF header is compatible with the running
>>>host. */
>>>+static inline int
>>>+elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>>>+{
>>>+ /* We can only run LoongArch binaries. */
>>>+ if (ehdr->e_machine != EM_LOONGARCH)
>>>+ return 0;
>>>+
>>>+ return 1;
>>>+}
>>>+
>>>+/* Return the run-time load address of the shared object. */
>>>+static inline ElfW (Addr) elf_machine_load_address (void)
>>>+{
>>>+ extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>>>+ return (ElfW(Addr)) &__ehdr_start;
>>>+}
>>>+
>>>+/* Return the link-time address of _DYNAMIC. */
>>>+static inline ElfW (Addr) elf_machine_dynamic (void)
>>>+{
>>>+ extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>>>+ return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>>>+}
>>>+
>>>+/* Initial entry point code for the dynamic linker.
>>>+ The C function `_dl_start' is the real entry point;
>>>+ its return value is the user program's entry point. */
>>>+
>>>+#define RTLD_START \
>>>+ asm(".text\n\
>>>+ " _RTLD_PROLOGUE (ENTRY_POINT) "\
>>>+ .cfi_label .Ldummy \n\
>>>+ " CFI_UNDEFINED (1) " \n\
>>>+ or $a0, $sp, $zero \n\
>>>+ bl _dl_start \n\
>>>+ # Stash user entry point in s0. \n\
>>>+ or $s0, $v0, $zero \n\
>>>+ # Load the original argument count. \n\
>>>+ ld.d $a1, $sp, 0 \n\
>>>+ # Call _dl_init (struct link_map *main_map, int argc, char
>>>**argv, \
>>>+ char **env) \n\
>>>+ la $a0, _rtld_local \n\
>>>+ ld.d $a0, $a0, 0 \n\
>>>+ addi.d $a2, $sp, 8 \n\
>>>+ slli.d $a3, $a1, 3 \n\
>>>+ add.d $a3, $a3, $a2 \n\
>>>+ addi.d $a3, $a3, 8 \n\
>>
>>The _dl_init seems much more complex than the riscv counterpart.
>>
>>>+ # Adjust $sp for 16-aligned \n\
>>>+ srli.d $t0, $sp, 4 \n\
>>>+ slli.d $t0, $t0, 4 \n\
>>>+ ori $t1, $sp, 0 \n\
>>>+ addi.d $sp, $t0, -32 \n\
>>>+ st.d $t1, $sp, 24 \n\
>>
>>Seems too complex.
>>
>>>+ # Call the function to run the initializers. \n\
>>>+ bl _dl_init \n\
>>>+ # Pass our finalizer function to _start. \n\
>>>+ ld.d $sp, $sp, 24 \n\
>>>+ la $a0, _dl_fini \n\
>>>+ # Jump to the user entry point. \n\
>>>+ jirl $zero, $s0, 0 \n\
>>>+ " _RTLD_EPILOGUE (ENTRY_POINT) "\
>>>+ .previous");
>>>+
>>>+/* Names of the architecture-specific auditing callback functions. */
>>>+#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>>>+#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>>>+
>>>+/* Bias .got.plt entry by the offset requested by the PLT header. */
>>>+#define elf_machine_plt_value(map, reloc, value) (value)
>>>+
>>>+static inline ElfW (Addr)
>>>+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>>>+ const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>>>+ const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>>>+ ElfW (Addr) value)
>>>+{
>>>+ return *reloc_addr = value;
>>>+}
>>>+
>>>+#endif /* !dl_machine_h */
>>>+
>>>+#ifdef RESOLVE_MAP
>>>+
>>>+/* Perform a relocation described by R_INFO at the location pointed to
>>>+ by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
>>>+ MAP is the object containing the reloc. */
>>>+
>>>+static inline void __attribute__ ((always_inline))
>>>+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>>>+ const ElfW (Rela) * reloc,
>>>+ const ElfW (Sym) * sym,
>>
>>Seems excess space after `*`
>>
>>>+ const struct r_found_version *version,
>>>+ void *const reloc_addr, int skip_ifunc)
>>>+{
>>>+ ElfW (Addr) r_info = reloc->r_info;
>>>+ const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>>>+ ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>>>+ const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>>>+ struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym,
>>>version, r_type);
>>>+ ElfW (Addr) value = 0;
>>>+ if (sym_map != NULL)
>>>+ value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>>>+
>>>+ if (sym != NULL
>>>+ && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) ==
>>>STT_GNU_IFUNC)
>>>+ && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>>>+ && __glibc_likely (!skip_ifunc))
>>>+ value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>>>+
>>>+ switch (r_type)
>>>+ {
>>>+#ifndef RTLD_BOOTSTRAP
>>>+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>>>+ R_LARCH_TLS_DTPMOD32:
>>>+ if (sym_map)
>>>+ *addr_field = sym_map->l_tls_modid;
>>>+ break;
>>
>>I know many ports do `if (sym_map)` but that seems (a) a workaround
>>for possibly
>>GNU ld bugs or (b) unneeded cargo cult.
>>
>>The check should better be removed.
>>
>>This applies to various TLS dynamic relocations below.
>>
>>>+
>>>+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>>>+ R_LARCH_TLS_DTPREL32:
>>>+ if (sym != NULL)
>>>+ *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>>>+ break;
>>>+
>>>+ case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>>>+ R_LARCH_TLS_TPREL32:
>>>+ if (sym != NULL)
>>>+ {
>>>+ CHECK_STATIC_TLS (map, sym_map);
>>>+ *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>>>+ }
>>>+ break;
>>>+
>>>+ case R_LARCH_COPY:
>>>+ {
>>>+ if (sym == NULL)
>>>+ /* This can happen in trace mode if an object could not be
>>>+ found. */
>>>+ break;
>>>+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
>>>+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
>>>+ && GLRO(dl_verbose)))
>>>+ {
>>>+ const char *strtab;
>>>+
>>>+ strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>>>+ _dl_error_printf ("\
>>>+%s: Symbol `%s' has different size in shared object, consider
>>>re-linking\n",
>>>+ rtld_progname ?: "<program name unknown>",
>>>+ strtab + refsym->st_name);
>>>+ }
>>>+ memcpy (reloc_addr, (void *) value,
>>>+ MIN (sym->st_size, refsym->st_size));
>>>+ break;
>>>+ }
>>>+#endif
>>>+
>>>+#if !defined RTLD_BOOTSTRAP
>>>+ case R_LARCH_RELATIVE:
>>>+ *addr_field = map->l_addr + reloc->r_addend;
>>>+ break;
>>>+#endif
>>
>>I think this is copied from riscv but its relocation code is probably
>>not the best reference. sysdeps/m68k/dl-machine.h may be one of the
>>better implementations for the relocation switch table.
>>
>>In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
>>needed in this function. There should be none of NONE, RELATIVE,
>>IRELATIVE, absolute relocation types, etc (RELATIVE is handled
>>elsewhere).
>>
>>GNU ld, in the presence of a bug, may produce spurious NONE relocations.
>>Not handling NONE can catch some bugs.
>>
>>>+ case R_LARCH_JUMP_SLOT:
>>>+ case __WORDSIZE == 64 ? R_LARCH_64:
>>>+ R_LARCH_32:
>>>+ *addr_field = value;
>>>+ break;
>>>+
>>>+ case R_LARCH_IRELATIVE:
>>>+ value = map->l_addr + reloc->r_addend;
>>>+ if (__glibc_likely (!skip_ifunc))
>>>+ value = ((ElfW (Addr) (*) (void)) value) ();
>>>+ *addr_field = value;
>>>+ break;
>>>+
>>>+ case R_LARCH_NONE:
>>>+ break;
>>>+
>>>+ default:
>>>+ _dl_reloc_bad_type (map, r_type, 0);
>>>+ break;
>>>+ }
>>>+}
>>>+
>>>+static inline void __attribute__ ((always_inline))
>>>+elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela)
>>>* reloc,
>>>+ void *const reloc_addr)
>>>+{
>>>+ *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>>>+}
>>>+
>>>+static inline void __attribute__ ((always_inline))
>>>+elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem
>>>*scope[],
>>>+ ElfW (Addr) l_addr,
>>>+ const ElfW (Rela) * reloc, int skip_ifunc)
>>>+{
>>>+ ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
>>>+ const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>>>+
>>>+ /* Check for unexpected PLT reloc type. */
>>>+ if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>>>+ {
>>>+ if (__glibc_unlikely (map->l_mach.plt == 0))
>>>+ {
>>>+ if (l_addr)
>>>+ *reloc_addr += l_addr;
>>>+ }
>>>+ else
>>>+ *reloc_addr = map->l_mach.plt;
>>>+ }
>>>+ else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>>
>>This is a design issue of ifunc for many ports.
>>Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>>.rela.plt, then you can remove this branch.
>>
>>>+ {
>>>+ ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>>>+ if (__glibc_likely (!skip_ifunc))
>>>+ value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>>>+ *reloc_addr = (ElfW (Addr)) value;
>>>+ }
>>>+ else
>>>+ _dl_reloc_bad_type (map, r_type, 1);
>>>+}
>>>+
>>>+/* Set up the loaded object described by L so its stub function
>>>+ will jump to the on-demand fixup code __dl_runtime_resolve. */
>>>+
>>>+static inline int __attribute__ ((always_inline))
>>>+elf_machine_runtime_setup (struct link_map *l, struct
>>>r_scope_elem *scope[],
>>>+ int lazy, int profile)
>>>+{
>>>+#ifndef RTLD_BOOTSTRAP
>>>+ /* If using PLTs, fill in the first two entries of .got.plt. */
>>>+ if (l->l_info[DT_JMPREL])
>>>+ {
>>>+ extern void _dl_runtime_resolve (void)
>>>+ __attribute__ ((visibility ("hidden")));
>>>+ ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l,
>>>l_info[DT_PLTGOT]);
>>>+ gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>>>+ gotplt[1] = (ElfW (Addr)) l;
>>>+ }
>>>+#endif
>>>+
>>>+ return lazy;
>>>+}
>>>+
>>>+#endif /* RESOLVE_MAP */
>>>diff --git a/sysdeps/loongarch/dl-trampoline.S
>>>b/sysdeps/loongarch/dl-trampoline.S
>>>new file mode 100644
>>>index 0000000000..eb610392f6
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/dl-trampoline.S
>>>@@ -0,0 +1,91 @@
>>>+/* PLT trampolines.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#include <sysdep.h>
>>>+#include <sys/asm.h>
>>>+
>>>+/* Assembler veneer called from the PLT header code for lazy loading.
>>>+ The PLT header passes its own args in t0-t2. */
>>>+
>>>+#ifdef __loongarch_soft_float
>>>+# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>>>+#else
>>>+# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>>>+#endif
>>>+
>>>+ENTRY (_dl_runtime_resolve)
>>>+
>>>+ /* Save arguments to stack. */
>>>+ ADDI sp, sp, -FRAME_SIZE
>>>+
>>>+ REG_S ra, sp, 9*SZREG
>>>+ REG_S a0, sp, 1*SZREG
>>>+ REG_S a1, sp, 2*SZREG
>>>+ REG_S a2, sp, 3*SZREG
>>>+ REG_S a3, sp, 4*SZREG
>>>+ REG_S a4, sp, 5*SZREG
>>>+ REG_S a5, sp, 6*SZREG
>>>+ REG_S a6, sp, 7*SZREG
>>>+ REG_S a7, sp, 8*SZREG
>>>+
>>>+#ifndef __loongarch_soft_float
>>>+ FREG_S fa0, sp, 10*SZREG + 0*SZFREG
>>>+ FREG_S fa1, sp, 10*SZREG + 1*SZFREG
>>>+ FREG_S fa2, sp, 10*SZREG + 2*SZFREG
>>>+ FREG_S fa3, sp, 10*SZREG + 3*SZFREG
>>>+ FREG_S fa4, sp, 10*SZREG + 4*SZFREG
>>>+ FREG_S fa5, sp, 10*SZREG + 5*SZFREG
>>>+ FREG_S fa6, sp, 10*SZREG + 6*SZFREG
>>>+ FREG_S fa7, sp, 10*SZREG + 7*SZFREG
>>>+#endif
>>>+
>>>+ /* Update .got.plt and obtain runtime address of callee */
>>>+ SLLI a1, t1, 1
>>>+ or a0, t0, zero
>>>+ ADD a1, a1, t1
>>>+ la a2, _dl_fixup
>>>+ jirl ra, a2, 0
>>>+ or t1, v0, zero
>>>+
>>>+ /* Restore arguments from stack. */
>>>+ REG_L ra, sp, 9*SZREG
>>>+ REG_L a0, sp, 1*SZREG
>>>+ REG_L a1, sp, 2*SZREG
>>>+ REG_L a2, sp, 3*SZREG
>>>+ REG_L a3, sp, 4*SZREG
>>>+ REG_L a4, sp, 5*SZREG
>>>+ REG_L a5, sp, 6*SZREG
>>>+ REG_L a6, sp, 7*SZREG
>>>+ REG_L a7, sp, 8*SZREG
>>>+
>>>+#ifndef __loongarch_soft_float
>>>+ FREG_L fa0, sp, 10*SZREG + 0*SZFREG
>>>+ FREG_L fa1, sp, 10*SZREG + 1*SZFREG
>>>+ FREG_L fa2, sp, 10*SZREG + 2*SZFREG
>>>+ FREG_L fa3, sp, 10*SZREG + 3*SZFREG
>>>+ FREG_L fa4, sp, 10*SZREG + 4*SZFREG
>>>+ FREG_L fa5, sp, 10*SZREG + 5*SZFREG
>>>+ FREG_L fa6, sp, 10*SZREG + 6*SZFREG
>>>+ FREG_L fa7, sp, 10*SZREG + 7*SZFREG
>>>+#endif
>>>+
>>>+ ADDI sp, sp, FRAME_SIZE
>>>+
>>>+ /* Invoke the callee. */
>>>+ jirl zero, t1, 0
>>>+END (_dl_runtime_resolve)
>>>diff --git a/sysdeps/loongarch/jmpbuf-offsets.h
>>>b/sysdeps/loongarch/jmpbuf-offsets.h
>>>new file mode 100644
>>>index 0000000000..a4b8ea690e
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/jmpbuf-offsets.h
>>>@@ -0,0 +1,22 @@
>>>+/* Private macros for accessing __jmp_buf contents.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>License as
>>>+ published by the Free Software Foundation; either version 2.1 of the
>>>+ License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#include <jmpbuf-unwind.h>
>>>+
>>>+/* Helper for generic ____longjmp_chk(). */
>>>+#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>>>diff --git a/sysdeps/loongarch/jmpbuf-unwind.h
>>>b/sysdeps/loongarch/jmpbuf-unwind.h
>>>new file mode 100644
>>>index 0000000000..6fa509151d
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/jmpbuf-unwind.h
>>>@@ -0,0 +1,45 @@
>>>+/* Examine __jmp_buf for unwinding frames.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#include <setjmp.h>
>>>+#include <stdint.h>
>>>+#include <unwind.h>
>>>+#include <sysdep.h>
>>>+
>>>+/* Test if longjmp to JMPBUF would unwind the frame
>>>+ containing a local variable at ADDRESS. */
>>>+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>>>+ ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>>>+
>>>+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>>>+ _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA
>>>(_context), _adj)
>>>+
>>>+static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp
>>>(__jmp_buf regs)
>>>+{
>>>+ uintptr_t sp = regs[0].__sp;
>>>+#ifdef PTR_DEMANGLE
>>>+ PTR_DEMANGLE (sp);
>>>+#endif
>>>+ return sp;
>>>+}
>>>+
>>>+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>>>+ ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>>>+
>>>+/* We use the normal longjmp for unwinding. */
>>>+#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>>>diff --git a/sysdeps/loongarch/ldsodefs.h b/sysdeps/loongarch/ldsodefs.h
>>>new file mode 100644
>>>index 0000000000..36b1b25b9f
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/ldsodefs.h
>>>@@ -0,0 +1,41 @@
>>>+/* Run-time dynamic linker data structures for loaded ELF shared
>>>objects.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#ifndef _LOONGARCH_LDSODEFS_H
>>>+#define _LOONGARCH_LDSODEFS_H 1
>>>+
>>>+#include <elf.h>
>>>+
>>>+struct La_loongarch_regs;
>>>+struct La_loongarch_retval;
>>>+
>>>+#define ARCH_PLTENTER_MEMBERS \
>>>+ ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
>>>+ uintptr_t *, uintptr_t *, \
>>>+ const struct La_loongarch_regs *, \
>>>+ unsigned int *, const char *name, \
>>>+ long int *framesizep);
>>>+
>>>+#define ARCH_PLTEXIT_MEMBERS \
>>>+ unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
>>>+ uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>>>+ struct La_loongarch_retval *, const char *);
>>>+
>>>+#include_next <ldsodefs.h>
>>>+
>>>+#endif
>>>diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>>>new file mode 100644
>>>index 0000000000..bbba73ed70
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/linkmap.h
>>>@@ -0,0 +1,22 @@
>>>+/* Definition of link_map_machine.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+struct link_map_machine
>>>+{
>>>+ ElfW (Addr) plt; /* Address of .plt. */
>>>+};
>>>diff --git a/sysdeps/loongarch/machine-gmon.h
>>>b/sysdeps/loongarch/machine-gmon.h
>>>new file mode 100644
>>>index 0000000000..4a3cdd964e
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/machine-gmon.h
>>>@@ -0,0 +1,37 @@
>>>+/* LoongArch definitions for profiling support.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library; if not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+/* Accept 'frompc' address as argument from the function that calls
>>>+ _mcount for profiling. Use __builtin_return_address (0)
>>>+ for the 'selfpc' address. */
>>>+
>>>+#include <sysdep.h>
>>>+
>>>+static void mcount_internal (unsigned long int frompc,
>>>+ unsigned long int selfpc);
>>>+
>>>+#define _MCOUNT_DECL(frompc, selfpc) \
>>>+ static inline void mcount_internal (unsigned long int frompc, \
>>>+ unsigned long int selfpc)
>>>+
>>>+#define MCOUNT \
>>>+ void _mcount (void *frompc) \
>>>+ { \
>>>+ mcount_internal ((unsigned long int) frompc, \
>>>+ (unsigned long int) RETURN_ADDRESS (0)); \
>>>+ }
>>>diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>>>new file mode 100644
>>>index 0000000000..b93ae2f5da
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/setjmp.S
>>>@@ -0,0 +1,66 @@
>>>+/* setjmp for LoongArch.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#include <sysdep.h>
>>>+#include <sys/asm.h>
>>>+
>>>+ENTRY (_setjmp)
>>>+ li.w a1,0
>>>+ b __sigsetjmp
>>>+END (_setjmp)
>>>+
>>>+ENTRY (setjmp)
>>>+ li.w a1,1
>>>+END (setjmp)
>>>+
>>>+ENTRY (__sigsetjmp)
>>>+ REG_S ra, a0, 0*SZREG
>>>+ REG_S sp, a0, 1*SZREG
>>>+ REG_S x, a0, 2*SZREG
>>>+ REG_S fp, a0, 3*SZREG
>>>+ REG_S s0, a0, 4*SZREG
>>>+ REG_S s1, a0, 5*SZREG
>>>+ REG_S s2, a0, 6*SZREG
>>>+ REG_S s3, a0, 7*SZREG
>>>+ REG_S s4, a0, 8*SZREG
>>>+ REG_S s5, a0, 9*SZREG
>>>+ REG_S s6, a0, 10*SZREG
>>>+ REG_S s7, a0, 11*SZREG
>>>+ REG_S s8, a0, 12*SZREG
>>>+
>>>+#ifndef __loongarch_soft_float
>>>+ FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>>>+ FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>>>+ FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>>>+ FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>>>+ FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>>>+ FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>>>+ FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>>>+ FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>>>+#endif
>>>+
>>>+#if !IS_IN (libc) && IS_IN(rtld)
>>>+ li.w v0, 0
>>>+ jirl zero,ra,0
>>>+#else
>>>+ b __sigjmp_save
>>>+#endif
>>>+END (__sigsetjmp)
>>>+
>>>+hidden_def (__sigsetjmp)
>>>+weak_alias (_setjmp, __GI__setjmp)
>>>diff --git a/sysdeps/loongarch/sotruss-lib.c
>>>b/sysdeps/loongarch/sotruss-lib.c
>>>new file mode 100644
>>>index 0000000000..5b15f4815a
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/sotruss-lib.c
>>>@@ -0,0 +1,50 @@
>>>+/* Override generic sotruss-lib.c to define actual functions for
>>>LoongArch.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#define HAVE_ARCH_PLTENTER
>>>+#define HAVE_ARCH_PLTEXIT
>>>+
>>>+#include <elf/sotruss-lib.c>
>>>+
>>>+ElfW (Addr)
>>>+la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>>>+ unsigned int ndx __attribute__ ((unused)),
>>>+ uintptr_t *refcook, uintptr_t *defcook,
>>>+ La_loongarch_regs *regs, unsigned int *flags,
>>>+ const char *symname, long int *framesizep)
>>>+{
>>>+ print_enter (refcook, defcook, symname, regs->lr_reg[0],
>>>regs->lr_reg[1],
>>>+ regs->lr_reg[2], *flags);
>>>+
>>>+ /* No need to copy anything, we will not need the parameters in
>>>any case. */
>>>+ *framesizep = 0;
>>>+
>>>+ return sym->st_value;
>>>+}
>>>+
>>>+unsigned int
>>>+la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>>>+ uintptr_t *refcook, uintptr_t *defcook,
>>>+ const struct La_loongarch_regs *inregs,
>>>+ struct La_loongarch_retval *outregs,
>>>+ const char *symname)
>>>+{
>>>+ print_exit (refcook, defcook, symname, outregs->lrv_a0);
>>>+
>>>+ return 0;
>>>+}
>>>diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>>>new file mode 100644
>>>index 0000000000..a9b32aa966
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/start.S
>>>@@ -0,0 +1,67 @@
>>>+/* Startup code compliant to the ELF LoongArch ABI.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#define __ASSEMBLY__ 1
>>>+#include <entry.h>
>>>+#include <sys/asm.h>
>>>+
>>>+/* The entry point's job is to call __libc_start_main. Per the ABI,
>>>+ a0 contains the address of a function to be passed to atexit.
>>>+ __libc_start_main wants this in a5. */
>>>+
>>>+/*
>>>+int
>>>+__libc_start_main (int (*main) (int, char **, char **),
>>>+ int argc,
>>>+ char **argv,
>>>+ __typeof (main) init,
>>>+ void (*fini) (void),
>>>+ void (*rtld_fini) (void),
>>>+ void *stack_end);
>>>+ */
>>>+
>>>+ENTRY (ENTRY_POINT)
>>>+
>>>+/* Terminate call stack by noting ra is undefined. Use a dummy
>>>+ .cfi_label to force starting the FDE. */
>>>+ .cfi_label .Ldummy
>>>+ cfi_undefined (1)
>>>+ or a5, a0, zero /* rtld_fini */
>>>+
>>>+/* We must get symbol main through GOT table, since main may not
>>>be local.
>>>+ For instance: googletest defines main in dynamic library. */
>>>+ la.got a0, t0, main
>>>+ REG_L a1, sp, 0
>>>+ ADDI a2, sp, SZREG
>>>+
>>>+ /* Adjust $sp for 16-aligned */
>>>+ SRLI sp, sp, 4
>>>+ SLLI sp, sp, 4
>>>+
>>>+ move a3, zero /* used to be init */
>>>+ move a4, zero /* used to be fini */
>>>+ or a6, sp, zero /* stack_end */
>>>+
>>>+ la.got ra, t0, __libc_start_main
>>>+ jirl ra, ra, 0
>>>+
>>>+ la.got ra, t0, abort
>>>+ jirl ra, ra, 0
>>>+END (ENTRY_POINT)
>>>+
>>>diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>>>new file mode 100644
>>>index 0000000000..b41ee59694
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/sys/asm.h
>>>@@ -0,0 +1,59 @@
>>>+/* Miscellaneous macros.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#ifndef _SYS_ASM_H
>>>+#define _SYS_ASM_H
>>>+
>>>+#include <sys/regdef.h>
>>>+#include <sysdeps/generic/sysdep.h>
>>>+
>>>+/* Macros to handle different pointer/register sizes for
>>>32/64-bit code. */
>>>+#define SZREG 8
>>>+#define SZFREG 8
>>>+#define REG_L ld.d
>>>+#define REG_S st.d
>>>+#define SRLI srli.d
>>>+#define SLLI slli.d
>>>+#define ADDI addi.d
>>>+#define ADD add.d
>>>+#define BSTRINS bstrins.d
>>>+#define LI li.d
>>>+#define FREG_L fld.d
>>>+#define FREG_S fst.d
>>>+
>>>+/* Declare leaf routine. */
>>>+#define LEAF(symbol) \
>>>+ .text; \
>>>+ .globl symbol; \
>>>+ .align 3; \
>>>+ cfi_startproc; \
>>>+ .type symbol, @function; \
>>>+ symbol:
>>>+
>>>+#define ENTRY(symbol) LEAF (symbol)
>>>+
>>>+/* Mark end of function. */
>>>+#undef END
>>>+#define END(function) \
>>>+ cfi_endproc; \
>>>+ .size function, .- function;
>>>+
>>>+/* Stack alignment. */
>>>+#define ALMASK ~15
>>>+
>>>+#endif /* sys/asm.h */
>>>diff --git a/sysdeps/loongarch/tst-audit.h
>>>b/sysdeps/loongarch/tst-audit.h
>>>new file mode 100644
>>>index 0000000000..e71948c86e
>>>--- /dev/null
>>>+++ b/sysdeps/loongarch/tst-audit.h
>>>@@ -0,0 +1,23 @@
>>>+/* Definitions for testing PLT entry/exit auditing.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <https://www.gnu.org/licenses/>. */
>>>+
>>>+#define pltenter la_loongarch_gnu_pltenter
>>>+#define pltexit la_loongarch_gnu_pltexit
>>>+#define La_regs La_loongarch_regs
>>>+#define La_retval La_loongarch_retval
>>>+#define int_retval lrv_a0
>>>diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>new file mode 100644
>>>index 0000000000..4887c30ca2
>>>--- /dev/null
>>>+++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>@@ -0,0 +1,26 @@
>>>+/* ldconfig default paths and libraries.
>>>+ Copyright (C) 2022 Free Software Foundation, Inc.
>>>+ This file is part of the GNU C Library.
>>>+
>>>+ The GNU C Library is free software; you can redistribute it and/or
>>>+ modify it under the terms of the GNU Lesser General Public
>>>+ License as published by the Free Software Foundation; either
>>>+ version 2.1 of the License, or (at your option) any later version.
>>>+
>>>+ The GNU C Library is distributed in the hope that it will be useful,
>>>+ but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>+ Lesser General Public License for more details.
>>>+
>>>+ You should have received a copy of the GNU Lesser General Public
>>>+ License along with the GNU C Library. If not, see
>>>+ <http://www.gnu.org/licenses/>. */
>>>+
>>>+#include <sysdeps/generic/ldconfig.h>
>>>+
>>>+#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>>>+ { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>>>+
>>>+#define SYSDEP_KNOWN_LIBRARY_NAMES \
>>>+ { "libc.so.6", FLAG_ELF_LIBC6 }, \
>>>+ { "libm.so.6", FLAG_ELF_LIBC6 },
>>>--
>>>2.31.1
>>>
+#ifndef RTLD_BOOTSTRAP
+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
+ R_LARCH_TLS_DTPMOD32:
+ if (sym_map)
+ *addr_field = sym_map->l_tls_modid;
+ break;
I know many ports do `if (sym_map)` but that seems (a) a workaround for
possibly
GNU ld bugs or (b) unneeded cargo cult.
The check should better be removed.
This applies to various TLS dynamic relocations below.
*Removed.
*
+ case R_LARCH_COPY:
+ {
+ if (sym == NULL)
+ /* This can happen in trace mode if an object could not be
+ found. */
+ break;
+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
+ && GLRO(dl_verbose)))
+ {
+ const char *strtab;
+
+ strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
+ _dl_error_printf ("\
+%s: Symbol `%s' has different size in shared object, consider
re-linking\n",
+ rtld_progname ?: "<program name unknown>",
+ strtab + refsym->st_name);
+ }
+ memcpy (reloc_addr, (void *) value,
+ MIN (sym->st_size, refsym->st_size));
+ break;
+ }
+#endif
+
+#if !defined RTLD_BOOTSTRAP
+ case R_LARCH_RELATIVE:
+ *addr_field = map->l_addr + reloc->r_addend;
+ break;
+#endif
I think this is copied from riscv but its relocation code is probably
not the best reference. sysdeps/m68k/dl-machine.h may be one of the
better implementations for the relocation switch table.
In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
needed in this function. There should be none of NONE, RELATIVE,
IRELATIVE, absolute relocation types, etc (RELATIVE is handled
elsewhere).
GNU ld, in the presence of a bug, may produce spurious NONE relocations.
Not handling NONE can catch some bugs.
*R_LARCH_64 and **R_68K_GLOB_DAT do the same thing.
*
*Thanks.
*
loongarch: m68k:
165 switch (r_type) |228 switch (r_type)
166 { |229 {
167 |230 *case R_68K_GLOB_DAT*:
168 case R_LARCH_JUMP_SLOT: |231 case R_68K_JMP_SLOT:
169 *case __WORDSIZE == 64 ? R_LARCH_64:* |232 **reloc_addr = value;*
170 R_LARCH_32: |233 break;
171 **addr_field = value;* |234 #ifndef RTLD_BOOTSTRAP
172 break; |235 case R_68K_COPY:
*>>>>>>>>>>>>>>>>*
*diff --git a/sysdeps/loongarch/dl-machine.h
b/sysdeps/loongarch/dl-machine.h
index 6ec9a403d3..31111a7372 100644
--- a/sysdeps/loongarch/dl-machine.h
+++ b/sysdeps/loongarch/dl-machine.h
@@ -164,26 +164,28 @@ elf_machine_rela (struct link_map *map, struct
r_scope_elem *scope[],
switch (r_type)
{
+
+ case R_LARCH_JUMP_SLOT:
+ case __WORDSIZE == 64 ? R_LARCH_64:
+ R_LARCH_32:
+ *addr_field = value;
+ break;
+
#ifndef RTLD_BOOTSTRAP
case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
R_LARCH_TLS_DTPMOD32:
- if (sym_map)
- *addr_field = sym_map->l_tls_modid;
+ *addr_field = sym_map->l_tls_modid;
break;
case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
R_LARCH_TLS_DTPREL32:
- if (sym != NULL)
- *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
+ *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
break;
case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
R_LARCH_TLS_TPREL32:
- if (sym != NULL)
- {
- CHECK_STATIC_TLS (map, sym_map);
- *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
- }
+ CHECK_STATIC_TLS (map, sym_map);
+ *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
break;
case R_LARCH_COPY:
@@ -208,19 +210,10 @@ elf_machine_rela (struct link_map *map, struct
r_scope_elem *scope[],
MIN (sym->st_size, refsym->st_size));
break;
}
-#endif
-#if !defined RTLD_BOOTSTRAP
case R_LARCH_RELATIVE:
*addr_field = map->l_addr + reloc->r_addend;
break;
-#endif
-
- case R_LARCH_JUMP_SLOT:
- case __WORDSIZE == 64 ? R_LARCH_64:
- R_LARCH_32:
- *addr_field = value;
- break;
case R_LARCH_IRELATIVE:
value = map->l_addr + reloc->r_addend;
@@ -231,6 +224,7 @@ elf_machine_rela (struct link_map *map, struct
r_scope_elem *scope[],
case R_LARCH_NONE:
break;
+#endif
default:
_dl_reloc_bad_type (map, r_type, 0);
*
*<<<<<<<<<<<<<<
*
在 2022/6/6 上午7:55, Fangrui Song 写道:
> On 2022-06-01, caiyinyu wrote:
>> ---
>> sysdeps/loongarch/__longjmp.S | 52 ++++
>> sysdeps/loongarch/bits/endianness.h | 11 +
>> sysdeps/loongarch/bits/link.h | 58 ++++
>> sysdeps/loongarch/bits/setjmp.h | 42 +++
>> sysdeps/loongarch/bsd-_setjmp.c | 1 +
>> sysdeps/loongarch/bsd-setjmp.c | 1 +
>> sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
>> sysdeps/loongarch/dl-trampoline.S | 91 ++++++
>> sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
>> sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
>> sysdeps/loongarch/ldsodefs.h | 41 +++
>> sysdeps/loongarch/linkmap.h | 22 ++
>> sysdeps/loongarch/machine-gmon.h | 37 +++
>> sysdeps/loongarch/setjmp.S | 66 ++++
>> sysdeps/loongarch/sotruss-lib.c | 50 +++
>> sysdeps/loongarch/start.S | 67 ++++
>> sysdeps/loongarch/sys/asm.h | 59 ++++
>> sysdeps/loongarch/tst-audit.h | 23 ++
>> sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
>> 19 files changed, 1021 insertions(+)
>> create mode 100644 sysdeps/loongarch/__longjmp.S
>> create mode 100644 sysdeps/loongarch/bits/endianness.h
>> create mode 100644 sysdeps/loongarch/bits/link.h
>> create mode 100644 sysdeps/loongarch/bits/setjmp.h
>> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
>> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
>> create mode 100644 sysdeps/loongarch/dl-machine.h
>> create mode 100644 sysdeps/loongarch/dl-trampoline.S
>> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
>> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
>> create mode 100644 sysdeps/loongarch/ldsodefs.h
>> create mode 100644 sysdeps/loongarch/linkmap.h
>> create mode 100644 sysdeps/loongarch/machine-gmon.h
>> create mode 100644 sysdeps/loongarch/setjmp.S
>> create mode 100644 sysdeps/loongarch/sotruss-lib.c
>> create mode 100644 sysdeps/loongarch/start.S
>> create mode 100644 sysdeps/loongarch/sys/asm.h
>> create mode 100644 sysdeps/loongarch/tst-audit.h
>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>
>> diff --git a/sysdeps/loongarch/__longjmp.S
>> b/sysdeps/loongarch/__longjmp.S
>> new file mode 100644
>> index 0000000000..b7690dd94f
>> --- /dev/null
>> +++ b/sysdeps/loongarch/__longjmp.S
>> @@ -0,0 +1,52 @@
>> +/* longjmp.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +ENTRY (__longjmp)
>> + REG_L ra, a0, 0*SZREG
>> + REG_L sp, a0, 1*SZREG
>> + REG_L x, a0, 2*SZREG
>> + REG_L fp, a0, 3*SZREG
>> + REG_L s0, a0, 4*SZREG
>> + REG_L s1, a0, 5*SZREG
>> + REG_L s2, a0, 6*SZREG
>> + REG_L s3, a0, 7*SZREG
>> + REG_L s4, a0, 8*SZREG
>> + REG_L s5, a0, 9*SZREG
>> + REG_L s6, a0, 10*SZREG
>> + REG_L s7, a0, 11*SZREG
>> + REG_L s8, a0, 12*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>> + FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>> + FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>> + FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>> + FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>> + FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>> + FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>> + FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>> +#endif
>> +
>> + sltui a0,a1,1
>> + ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
>> + jirl zero,ra,0
>> +
>> +END (__longjmp)
>> diff --git a/sysdeps/loongarch/bits/endianness.h
>> b/sysdeps/loongarch/bits/endianness.h
>> new file mode 100644
>> index 0000000000..7290be7b18
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/endianness.h
>> @@ -0,0 +1,11 @@
>> +#ifndef _BITS_ENDIANNESS_H
>> +#define _BITS_ENDIANNESS_H 1
>> +
>> +#ifndef _BITS_ENDIAN_H
>> +#error "Never use <bits/endianness.h> directly; include <endian.h>
>> instead."
>> +#endif
>> +
>> +/* LoongArch is little-endian. */
>> +#define __BYTE_ORDER __LITTLE_ENDIAN
>> +
>> +#endif /* bits/endianness.h */
>> diff --git a/sysdeps/loongarch/bits/link.h
>> b/sysdeps/loongarch/bits/link.h
>> new file mode 100644
>> index 0000000000..4df09989cb
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/link.h
>> @@ -0,0 +1,58 @@
>> +/* Machine-specific declarations for dynamic linker interface.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LINK_H
>> +#error "Never include <bits/link.h> directly; use <link.h> instead."
>> +#endif
>> +
>> +typedef struct La_loongarch_regs
>> +{
>> + unsigned long int lr_reg[8]; /* a0 - a7 */
>> + double lr_fpreg[8]; /* fa0 - fa7 */
>> + unsigned long int lr_ra;
>> + unsigned long int lr_sp;
>> +} La_loongarch_regs;
>> +
>> +/* Return values for calls from PLT on LoongArch. */
>> +typedef struct La_loongarch_retval
>> +{
>> + unsigned long int lrv_a0;
>> + unsigned long int lrv_a1;
>> + double lrv_fa0;
>> + double lrv_fa1;
>> +} La_loongarch_retval;
>> +
>> +__BEGIN_DECLS
>> +
>> +extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>> + unsigned int __ndx,
>> + uintptr_t *__refcook,
>> + uintptr_t *__defcook,
>> + La_loongarch_regs *__regs,
>> + unsigned int *__flags,
>> + const char *__symname,
>> + long int *__framesizep);
>> +extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>> + unsigned int __ndx,
>> + uintptr_t *__refcook,
>> + uintptr_t *__defcook,
>> + const La_loongarch_regs *__inregs,
>> + La_loongarch_retval *__outregs,
>> + const char *__symname);
>> +
>> +__END_DECLS
>> diff --git a/sysdeps/loongarch/bits/setjmp.h
>> b/sysdeps/loongarch/bits/setjmp.h
>> new file mode 100644
>> index 0000000000..8b323ad2b6
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bits/setjmp.h
>> @@ -0,0 +1,42 @@
>> +/* Define the machine-dependent type `jmp_buf'.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LOONGARCH_BITS_SETJMP_H
>> +#define _LOONGARCH_BITS_SETJMP_H
>> +
>> +typedef struct __jmp_buf_internal_tag
>> +{
>> + /* Program counter. */
>> + long int __pc;
>> + /* Stack pointer. */
>> + long int __sp;
>> + /* Reserved */
>> + long int __x;
>> + /* Frame pointer. */
>> + long int __fp;
>> + /* Callee-saved registers. */
>> + long int __regs[9];
>> +
>> +#ifndef __loongarch_soft_float
>> + /* Callee-saved floating point registers. */
>> + double __fpregs[8];
>> +#endif
>> +
>> +} __jmp_buf[1];
>> +
>> +#endif /* _LOONGARCH_BITS_SETJMP_H */
>> diff --git a/sysdeps/loongarch/bsd-_setjmp.c
>> b/sysdeps/loongarch/bsd-_setjmp.c
>> new file mode 100644
>> index 0000000000..32f49441c3
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bsd-_setjmp.c
>> @@ -0,0 +1 @@
>> +/* _setjmp is implemented in setjmp.S. */
>> diff --git a/sysdeps/loongarch/bsd-setjmp.c
>> b/sysdeps/loongarch/bsd-setjmp.c
>> new file mode 100644
>> index 0000000000..45fd802aac
>> --- /dev/null
>> +++ b/sysdeps/loongarch/bsd-setjmp.c
>> @@ -0,0 +1 @@
>> +/* setjmp is implemented in setjmp.S. */
>> diff --git a/sysdeps/loongarch/dl-machine.h
>> b/sysdeps/loongarch/dl-machine.h
>> new file mode 100644
>> index 0000000000..4e19ad9319
>> --- /dev/null
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -0,0 +1,307 @@
>> +/* Machine-dependent ELF dynamic relocation inline functions.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> +
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef dl_machine_h
>> +#define dl_machine_h
>> +
>> +#define ELF_MACHINE_NAME "LoongArch"
>> +
>> +#include <entry.h>
>> +#include <elf/elf.h>
>> +#include <sys/asm.h>
>> +#include <dl-tls.h>
>> +#include <dl-static-tls.h>
>> +#include <dl-machine-rel.h>
>> +
>> +#ifndef _RTLD_PROLOGUE
>> +# define _RTLD_PROLOGUE(entry) \
>> + ".globl\t" __STRING (entry) "\n\t" \
>> + ".type\t" __STRING (entry) ", @function\n\t" \
>> + CFI_STARTPROC "\n" \
>> + __STRING (entry) ":\n"
>> +#endif
>> +
>> +#ifndef _RTLD_EPILOGUE
>> +# define _RTLD_EPILOGUE(entry) \
>> + CFI_ENDPROC "\n\t" \
>> + ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>> +#endif
>> +
>> +#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>> +#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>> +
>> +#define elf_machine_type_class(type) \
>> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>
> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
> seems an unneeded hack for many ports. Can you check does loongarch
> really need them?
>
>> + | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>> +
>> +#define ELF_MACHINE_NO_REL 1
>> +#define ELF_MACHINE_NO_RELA 0
>> +
>> +/* Return nonzero iff ELF header is compatible with the running
>> host. */
>> +static inline int
>> +elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>> +{
>> + /* We can only run LoongArch binaries. */
>> + if (ehdr->e_machine != EM_LOONGARCH)
>> + return 0;
>> +
>> + return 1;
>> +}
>> +
>> +/* Return the run-time load address of the shared object. */
>> +static inline ElfW (Addr) elf_machine_load_address (void)
>> +{
>> + extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>> + return (ElfW(Addr)) &__ehdr_start;
>> +}
>> +
>> +/* Return the link-time address of _DYNAMIC. */
>> +static inline ElfW (Addr) elf_machine_dynamic (void)
>> +{
>> + extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>> + return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>> +}
>> +
>> +/* Initial entry point code for the dynamic linker.
>> + The C function `_dl_start' is the real entry point;
>> + its return value is the user program's entry point. */
>> +
>> +#define RTLD_START \
>> + asm(".text\n\
>> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
>> + .cfi_label .Ldummy \n\
>> + " CFI_UNDEFINED (1) " \n\
>> + or $a0, $sp, $zero \n\
>> + bl _dl_start \n\
>> + # Stash user entry point in s0. \n\
>> + or $s0, $v0, $zero \n\
>> + # Load the original argument count. \n\
>> + ld.d $a1, $sp, 0 \n\
>> + # Call _dl_init (struct link_map *main_map, int argc, char
>> **argv, \
>> + char **env) \n\
>> + la $a0, _rtld_local \n\
>> + ld.d $a0, $a0, 0 \n\
>> + addi.d $a2, $sp, 8 \n\
>> + slli.d $a3, $a1, 3 \n\
>> + add.d $a3, $a3, $a2 \n\
>> + addi.d $a3, $a3, 8 \n\
>
> The _dl_init seems much more complex than the riscv counterpart.
>
>> + # Adjust $sp for 16-aligned \n\
>> + srli.d $t0, $sp, 4 \n\
>> + slli.d $t0, $t0, 4 \n\
>> + ori $t1, $sp, 0 \n\
>> + addi.d $sp, $t0, -32 \n\
>> + st.d $t1, $sp, 24 \n\
>
> Seems too complex.
>
>> + # Call the function to run the initializers. \n\
>> + bl _dl_init \n\
>> + # Pass our finalizer function to _start. \n\
>> + ld.d $sp, $sp, 24 \n\
>> + la $a0, _dl_fini \n\
>> + # Jump to the user entry point. \n\
>> + jirl $zero, $s0, 0 \n\
>> + " _RTLD_EPILOGUE (ENTRY_POINT) "\
>> + .previous");
>> +
>> +/* Names of the architecture-specific auditing callback functions. */
>> +#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>> +#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>> +
>> +/* Bias .got.plt entry by the offset requested by the PLT header. */
>> +#define elf_machine_plt_value(map, reloc, value) (value)
>> +
>> +static inline ElfW (Addr)
>> +elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>> + const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>> + const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>> + ElfW (Addr) value)
>> +{
>> + return *reloc_addr = value;
>> +}
>> +
>> +#endif /* !dl_machine_h */
>> +
>> +#ifdef RESOLVE_MAP
>> +
>> +/* Perform a relocation described by R_INFO at the location pointed to
>> + by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
>> + MAP is the object containing the reloc. */
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>> + const ElfW (Rela) * reloc,
>> + const ElfW (Sym) * sym,
>
> Seems excess space after `*`
>
>> + const struct r_found_version *version,
>> + void *const reloc_addr, int skip_ifunc)
>> +{
>> + ElfW (Addr) r_info = reloc->r_info;
>> + const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>> + ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>> + const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>> + struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version,
>> r_type);
>> + ElfW (Addr) value = 0;
>> + if (sym_map != NULL)
>> + value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>> +
>> + if (sym != NULL
>> + && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) ==
>> STT_GNU_IFUNC)
>> + && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>> + && __glibc_likely (!skip_ifunc))
>> + value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>> +
>> + switch (r_type)
>> + {
>> +#ifndef RTLD_BOOTSTRAP
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>> + R_LARCH_TLS_DTPMOD32:
>> + if (sym_map)
>> + *addr_field = sym_map->l_tls_modid;
>> + break;
>
> I know many ports do `if (sym_map)` but that seems (a) a workaround
> for possibly
> GNU ld bugs or (b) unneeded cargo cult.
>
> The check should better be removed.
>
> This applies to various TLS dynamic relocations below.
>
>> +
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>> + R_LARCH_TLS_DTPREL32:
>> + if (sym != NULL)
>> + *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>> + break;
>> +
>> + case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>> + R_LARCH_TLS_TPREL32:
>> + if (sym != NULL)
>> + {
>> + CHECK_STATIC_TLS (map, sym_map);
>> + *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>> + }
>> + break;
>> +
>> + case R_LARCH_COPY:
>> + {
>> + if (sym == NULL)
>> + /* This can happen in trace mode if an object could not be
>> + found. */
>> + break;
>> + if (__glibc_unlikely (sym->st_size > refsym->st_size)
>> + || (__glibc_unlikely (sym->st_size < refsym->st_size)
>> + && GLRO(dl_verbose)))
>> + {
>> + const char *strtab;
>> +
>> + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>> + _dl_error_printf ("\
>> +%s: Symbol `%s' has different size in shared object, consider
>> re-linking\n",
>> + rtld_progname ?: "<program name unknown>",
>> + strtab + refsym->st_name);
>> + }
>> + memcpy (reloc_addr, (void *) value,
>> + MIN (sym->st_size, refsym->st_size));
>> + break;
>> + }
>> +#endif
>> +
>> +#if !defined RTLD_BOOTSTRAP
>> + case R_LARCH_RELATIVE:
>> + *addr_field = map->l_addr + reloc->r_addend;
>> + break;
>> +#endif
>
> I think this is copied from riscv but its relocation code is probably
> not the best reference. sysdeps/m68k/dl-machine.h may be one of the
> better implementations for the relocation switch table.
>
> In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
> needed in this function. There should be none of NONE, RELATIVE,
> IRELATIVE, absolute relocation types, etc (RELATIVE is handled
> elsewhere).
>
> GNU ld, in the presence of a bug, may produce spurious NONE relocations.
> Not handling NONE can catch some bugs.
>
>> + case R_LARCH_JUMP_SLOT:
>> + case __WORDSIZE == 64 ? R_LARCH_64:
>> + R_LARCH_32:
>> + *addr_field = value;
>> + break;
>> +
>> + case R_LARCH_IRELATIVE:
>> + value = map->l_addr + reloc->r_addend;
>> + if (__glibc_likely (!skip_ifunc))
>> + value = ((ElfW (Addr) (*) (void)) value) ();
>> + *addr_field = value;
>> + break;
>> +
>> + case R_LARCH_NONE:
>> + break;
>> +
>> + default:
>> + _dl_reloc_bad_type (map, r_type, 0);
>> + break;
>> + }
>> +}
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) *
>> reloc,
>> + void *const reloc_addr)
>> +{
>> + *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>> +}
>> +
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem
>> *scope[],
>> + ElfW (Addr) l_addr,
>> + const ElfW (Rela) * reloc, int skip_ifunc)
>> +{
>> + ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
>> + const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>> +
>> + /* Check for unexpected PLT reloc type. */
>> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>> + {
>> + if (__glibc_unlikely (map->l_mach.plt == 0))
>> + {
>> + if (l_addr)
>> + *reloc_addr += l_addr;
>> + }
>> + else
>> + *reloc_addr = map->l_mach.plt;
>> + }
>> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>> + {
>> + ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>> + if (__glibc_likely (!skip_ifunc))
>> + value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>> + *reloc_addr = (ElfW (Addr)) value;
>> + }
>> + else
>> + _dl_reloc_bad_type (map, r_type, 1);
>> +}
>> +
>> +/* Set up the loaded object described by L so its stub function
>> + will jump to the on-demand fixup code __dl_runtime_resolve. */
>> +
>> +static inline int __attribute__ ((always_inline))
>> +elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem
>> *scope[],
>> + int lazy, int profile)
>> +{
>> +#ifndef RTLD_BOOTSTRAP
>> + /* If using PLTs, fill in the first two entries of .got.plt. */
>> + if (l->l_info[DT_JMPREL])
>> + {
>> + extern void _dl_runtime_resolve (void)
>> + __attribute__ ((visibility ("hidden")));
>> + ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l,
>> l_info[DT_PLTGOT]);
>> + gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>> + gotplt[1] = (ElfW (Addr)) l;
>> + }
>> +#endif
>> +
>> + return lazy;
>> +}
>> +
>> +#endif /* RESOLVE_MAP */
>> diff --git a/sysdeps/loongarch/dl-trampoline.S
>> b/sysdeps/loongarch/dl-trampoline.S
>> new file mode 100644
>> index 0000000000..eb610392f6
>> --- /dev/null
>> +++ b/sysdeps/loongarch/dl-trampoline.S
>> @@ -0,0 +1,91 @@
>> +/* PLT trampolines.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +/* Assembler veneer called from the PLT header code for lazy loading.
>> + The PLT header passes its own args in t0-t2. */
>> +
>> +#ifdef __loongarch_soft_float
>> +# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>> +#else
>> +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>> +#endif
>> +
>> +ENTRY (_dl_runtime_resolve)
>> +
>> + /* Save arguments to stack. */
>> + ADDI sp, sp, -FRAME_SIZE
>> +
>> + REG_S ra, sp, 9*SZREG
>> + REG_S a0, sp, 1*SZREG
>> + REG_S a1, sp, 2*SZREG
>> + REG_S a2, sp, 3*SZREG
>> + REG_S a3, sp, 4*SZREG
>> + REG_S a4, sp, 5*SZREG
>> + REG_S a5, sp, 6*SZREG
>> + REG_S a6, sp, 7*SZREG
>> + REG_S a7, sp, 8*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_S fa0, sp, 10*SZREG + 0*SZFREG
>> + FREG_S fa1, sp, 10*SZREG + 1*SZFREG
>> + FREG_S fa2, sp, 10*SZREG + 2*SZFREG
>> + FREG_S fa3, sp, 10*SZREG + 3*SZFREG
>> + FREG_S fa4, sp, 10*SZREG + 4*SZFREG
>> + FREG_S fa5, sp, 10*SZREG + 5*SZFREG
>> + FREG_S fa6, sp, 10*SZREG + 6*SZFREG
>> + FREG_S fa7, sp, 10*SZREG + 7*SZFREG
>> +#endif
>> +
>> + /* Update .got.plt and obtain runtime address of callee */
>> + SLLI a1, t1, 1
>> + or a0, t0, zero
>> + ADD a1, a1, t1
>> + la a2, _dl_fixup
>> + jirl ra, a2, 0
>> + or t1, v0, zero
>> +
>> + /* Restore arguments from stack. */
>> + REG_L ra, sp, 9*SZREG
>> + REG_L a0, sp, 1*SZREG
>> + REG_L a1, sp, 2*SZREG
>> + REG_L a2, sp, 3*SZREG
>> + REG_L a3, sp, 4*SZREG
>> + REG_L a4, sp, 5*SZREG
>> + REG_L a5, sp, 6*SZREG
>> + REG_L a6, sp, 7*SZREG
>> + REG_L a7, sp, 8*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_L fa0, sp, 10*SZREG + 0*SZFREG
>> + FREG_L fa1, sp, 10*SZREG + 1*SZFREG
>> + FREG_L fa2, sp, 10*SZREG + 2*SZFREG
>> + FREG_L fa3, sp, 10*SZREG + 3*SZFREG
>> + FREG_L fa4, sp, 10*SZREG + 4*SZFREG
>> + FREG_L fa5, sp, 10*SZREG + 5*SZFREG
>> + FREG_L fa6, sp, 10*SZREG + 6*SZFREG
>> + FREG_L fa7, sp, 10*SZREG + 7*SZFREG
>> +#endif
>> +
>> + ADDI sp, sp, FRAME_SIZE
>> +
>> + /* Invoke the callee. */
>> + jirl zero, t1, 0
>> +END (_dl_runtime_resolve)
>> diff --git a/sysdeps/loongarch/jmpbuf-offsets.h
>> b/sysdeps/loongarch/jmpbuf-offsets.h
>> new file mode 100644
>> index 0000000000..a4b8ea690e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/jmpbuf-offsets.h
>> @@ -0,0 +1,22 @@
>> +/* Private macros for accessing __jmp_buf contents.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> License as
>> + published by the Free Software Foundation; either version 2.1 of the
>> + License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <jmpbuf-unwind.h>
>> +
>> +/* Helper for generic ____longjmp_chk(). */
>> +#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>> diff --git a/sysdeps/loongarch/jmpbuf-unwind.h
>> b/sysdeps/loongarch/jmpbuf-unwind.h
>> new file mode 100644
>> index 0000000000..6fa509151d
>> --- /dev/null
>> +++ b/sysdeps/loongarch/jmpbuf-unwind.h
>> @@ -0,0 +1,45 @@
>> +/* Examine __jmp_buf for unwinding frames.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <setjmp.h>
>> +#include <stdint.h>
>> +#include <unwind.h>
>> +#include <sysdep.h>
>> +
>> +/* Test if longjmp to JMPBUF would unwind the frame
>> + containing a local variable at ADDRESS. */
>> +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>> + ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>> +
>> +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>> + _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context),
>> _adj)
>> +
>> +static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp
>> (__jmp_buf regs)
>> +{
>> + uintptr_t sp = regs[0].__sp;
>> +#ifdef PTR_DEMANGLE
>> + PTR_DEMANGLE (sp);
>> +#endif
>> + return sp;
>> +}
>> +
>> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>> + ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>> +
>> +/* We use the normal longjmp for unwinding. */
>> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>> diff --git a/sysdeps/loongarch/ldsodefs.h b/sysdeps/loongarch/ldsodefs.h
>> new file mode 100644
>> index 0000000000..36b1b25b9f
>> --- /dev/null
>> +++ b/sysdeps/loongarch/ldsodefs.h
>> @@ -0,0 +1,41 @@
>> +/* Run-time dynamic linker data structures for loaded ELF shared
>> objects.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _LOONGARCH_LDSODEFS_H
>> +#define _LOONGARCH_LDSODEFS_H 1
>> +
>> +#include <elf.h>
>> +
>> +struct La_loongarch_regs;
>> +struct La_loongarch_retval;
>> +
>> +#define ARCH_PLTENTER_MEMBERS \
>> + ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
>> + uintptr_t *, uintptr_t *, \
>> + const struct La_loongarch_regs *, \
>> + unsigned int *, const char *name, \
>> + long int *framesizep);
>> +
>> +#define ARCH_PLTEXIT_MEMBERS \
>> + unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
>> + uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>> + struct La_loongarch_retval *, const char *);
>> +
>> +#include_next <ldsodefs.h>
>> +
>> +#endif
>> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>> new file mode 100644
>> index 0000000000..bbba73ed70
>> --- /dev/null
>> +++ b/sysdeps/loongarch/linkmap.h
>> @@ -0,0 +1,22 @@
>> +/* Definition of link_map_machine.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +struct link_map_machine
>> +{
>> + ElfW (Addr) plt; /* Address of .plt. */
>> +};
>> diff --git a/sysdeps/loongarch/machine-gmon.h
>> b/sysdeps/loongarch/machine-gmon.h
>> new file mode 100644
>> index 0000000000..4a3cdd964e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/machine-gmon.h
>> @@ -0,0 +1,37 @@
>> +/* LoongArch definitions for profiling support.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library; if not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +/* Accept 'frompc' address as argument from the function that calls
>> + _mcount for profiling. Use __builtin_return_address (0)
>> + for the 'selfpc' address. */
>> +
>> +#include <sysdep.h>
>> +
>> +static void mcount_internal (unsigned long int frompc,
>> + unsigned long int selfpc);
>> +
>> +#define _MCOUNT_DECL(frompc, selfpc) \
>> + static inline void mcount_internal (unsigned long int frompc, \
>> + unsigned long int selfpc)
>> +
>> +#define MCOUNT \
>> + void _mcount (void *frompc) \
>> + { \
>> + mcount_internal ((unsigned long int) frompc, \
>> + (unsigned long int) RETURN_ADDRESS (0)); \
>> + }
>> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>> new file mode 100644
>> index 0000000000..b93ae2f5da
>> --- /dev/null
>> +++ b/sysdeps/loongarch/setjmp.S
>> @@ -0,0 +1,66 @@
>> +/* setjmp for LoongArch.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdep.h>
>> +#include <sys/asm.h>
>> +
>> +ENTRY (_setjmp)
>> + li.w a1,0
>> + b __sigsetjmp
>> +END (_setjmp)
>> +
>> +ENTRY (setjmp)
>> + li.w a1,1
>> +END (setjmp)
>> +
>> +ENTRY (__sigsetjmp)
>> + REG_S ra, a0, 0*SZREG
>> + REG_S sp, a0, 1*SZREG
>> + REG_S x, a0, 2*SZREG
>> + REG_S fp, a0, 3*SZREG
>> + REG_S s0, a0, 4*SZREG
>> + REG_S s1, a0, 5*SZREG
>> + REG_S s2, a0, 6*SZREG
>> + REG_S s3, a0, 7*SZREG
>> + REG_S s4, a0, 8*SZREG
>> + REG_S s5, a0, 9*SZREG
>> + REG_S s6, a0, 10*SZREG
>> + REG_S s7, a0, 11*SZREG
>> + REG_S s8, a0, 12*SZREG
>> +
>> +#ifndef __loongarch_soft_float
>> + FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>> + FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>> + FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>> + FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>> + FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>> + FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>> + FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>> + FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>> +#endif
>> +
>> +#if !IS_IN (libc) && IS_IN(rtld)
>> + li.w v0, 0
>> + jirl zero,ra,0
>> +#else
>> + b __sigjmp_save
>> +#endif
>> +END (__sigsetjmp)
>> +
>> +hidden_def (__sigsetjmp)
>> +weak_alias (_setjmp, __GI__setjmp)
>> diff --git a/sysdeps/loongarch/sotruss-lib.c
>> b/sysdeps/loongarch/sotruss-lib.c
>> new file mode 100644
>> index 0000000000..5b15f4815a
>> --- /dev/null
>> +++ b/sysdeps/loongarch/sotruss-lib.c
>> @@ -0,0 +1,50 @@
>> +/* Override generic sotruss-lib.c to define actual functions for
>> LoongArch.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define HAVE_ARCH_PLTENTER
>> +#define HAVE_ARCH_PLTEXIT
>> +
>> +#include <elf/sotruss-lib.c>
>> +
>> +ElfW (Addr)
>> +la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>> + unsigned int ndx __attribute__ ((unused)),
>> + uintptr_t *refcook, uintptr_t *defcook,
>> + La_loongarch_regs *regs, unsigned int *flags,
>> + const char *symname, long int *framesizep)
>> +{
>> + print_enter (refcook, defcook, symname, regs->lr_reg[0],
>> regs->lr_reg[1],
>> + regs->lr_reg[2], *flags);
>> +
>> + /* No need to copy anything, we will not need the parameters in
>> any case. */
>> + *framesizep = 0;
>> +
>> + return sym->st_value;
>> +}
>> +
>> +unsigned int
>> +la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>> + uintptr_t *refcook, uintptr_t *defcook,
>> + const struct La_loongarch_regs *inregs,
>> + struct La_loongarch_retval *outregs,
>> + const char *symname)
>> +{
>> + print_exit (refcook, defcook, symname, outregs->lrv_a0);
>> +
>> + return 0;
>> +}
>> diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>> new file mode 100644
>> index 0000000000..a9b32aa966
>> --- /dev/null
>> +++ b/sysdeps/loongarch/start.S
>> @@ -0,0 +1,67 @@
>> +/* Startup code compliant to the ELF LoongArch ABI.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define __ASSEMBLY__ 1
>> +#include <entry.h>
>> +#include <sys/asm.h>
>> +
>> +/* The entry point's job is to call __libc_start_main. Per the ABI,
>> + a0 contains the address of a function to be passed to atexit.
>> + __libc_start_main wants this in a5. */
>> +
>> +/*
>> +int
>> +__libc_start_main (int (*main) (int, char **, char **),
>> + int argc,
>> + char **argv,
>> + __typeof (main) init,
>> + void (*fini) (void),
>> + void (*rtld_fini) (void),
>> + void *stack_end);
>> + */
>> +
>> +ENTRY (ENTRY_POINT)
>> +
>> +/* Terminate call stack by noting ra is undefined. Use a dummy
>> + .cfi_label to force starting the FDE. */
>> + .cfi_label .Ldummy
>> + cfi_undefined (1)
>> + or a5, a0, zero /* rtld_fini */
>> +
>> +/* We must get symbol main through GOT table, since main may not be
>> local.
>> + For instance: googletest defines main in dynamic library. */
>> + la.got a0, t0, main
>> + REG_L a1, sp, 0
>> + ADDI a2, sp, SZREG
>> +
>> + /* Adjust $sp for 16-aligned */
>> + SRLI sp, sp, 4
>> + SLLI sp, sp, 4
>> +
>> + move a3, zero /* used to be init */
>> + move a4, zero /* used to be fini */
>> + or a6, sp, zero /* stack_end */
>> +
>> + la.got ra, t0, __libc_start_main
>> + jirl ra, ra, 0
>> +
>> + la.got ra, t0, abort
>> + jirl ra, ra, 0
>> +END (ENTRY_POINT)
>> +
>> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>> new file mode 100644
>> index 0000000000..b41ee59694
>> --- /dev/null
>> +++ b/sysdeps/loongarch/sys/asm.h
>> @@ -0,0 +1,59 @@
>> +/* Miscellaneous macros.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#ifndef _SYS_ASM_H
>> +#define _SYS_ASM_H
>> +
>> +#include <sys/regdef.h>
>> +#include <sysdeps/generic/sysdep.h>
>> +
>> +/* Macros to handle different pointer/register sizes for 32/64-bit
>> code. */
>> +#define SZREG 8
>> +#define SZFREG 8
>> +#define REG_L ld.d
>> +#define REG_S st.d
>> +#define SRLI srli.d
>> +#define SLLI slli.d
>> +#define ADDI addi.d
>> +#define ADD add.d
>> +#define BSTRINS bstrins.d
>> +#define LI li.d
>> +#define FREG_L fld.d
>> +#define FREG_S fst.d
>> +
>> +/* Declare leaf routine. */
>> +#define LEAF(symbol) \
>> + .text; \
>> + .globl symbol; \
>> + .align 3; \
>> + cfi_startproc; \
>> + .type symbol, @function; \
>> + symbol:
>> +
>> +#define ENTRY(symbol) LEAF (symbol)
>> +
>> +/* Mark end of function. */
>> +#undef END
>> +#define END(function) \
>> + cfi_endproc; \
>> + .size function, .- function;
>> +
>> +/* Stack alignment. */
>> +#define ALMASK ~15
>> +
>> +#endif /* sys/asm.h */
>> diff --git a/sysdeps/loongarch/tst-audit.h
>> b/sysdeps/loongarch/tst-audit.h
>> new file mode 100644
>> index 0000000000..e71948c86e
>> --- /dev/null
>> +++ b/sysdeps/loongarch/tst-audit.h
>> @@ -0,0 +1,23 @@
>> +/* Definitions for testing PLT entry/exit auditing.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <https://www.gnu.org/licenses/>. */
>> +
>> +#define pltenter la_loongarch_gnu_pltenter
>> +#define pltexit la_loongarch_gnu_pltexit
>> +#define La_regs La_loongarch_regs
>> +#define La_retval La_loongarch_retval
>> +#define int_retval lrv_a0
>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> new file mode 100644
>> index 0000000000..4887c30ca2
>> --- /dev/null
>> +++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>> @@ -0,0 +1,26 @@
>> +/* ldconfig default paths and libraries.
>> + Copyright (C) 2022 Free Software Foundation, Inc.
>> + This file is part of the GNU C Library.
>> +
>> + The GNU C Library is free software; you can redistribute it and/or
>> + modify it under the terms of the GNU Lesser General Public
>> + License as published by the Free Software Foundation; either
>> + version 2.1 of the License, or (at your option) any later version.
>> +
>> + The GNU C Library is distributed in the hope that it will be useful,
>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>> + Lesser General Public License for more details.
>> +
>> + You should have received a copy of the GNU Lesser General Public
>> + License along with the GNU C Library. If not, see
>> + <http://www.gnu.org/licenses/>. */
>> +
>> +#include <sysdeps/generic/ldconfig.h>
>> +
>> +#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>> + { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>> +
>> +#define SYSDEP_KNOWN_LIBRARY_NAMES \
>> + { "libc.so.6", FLAG_ELF_LIBC6 }, \
>> + { "libm.so.6", FLAG_ELF_LIBC6 },
>> --
>> 2.31.1
>>
> + /* Check for unexpected PLT reloc type. */
> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
> + {
> + if (__glibc_unlikely (map->l_mach.plt == 0))
> + {
> + if (l_addr)
> + *reloc_addr += l_addr;
> + }
> + else
> + *reloc_addr = map->l_mach.plt;
> + }
> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>
> *Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs
> in their **.rela.plt.*
>
> *But I don't understand why "Ideally R_*_IRELATIVE relocations are
> only in .rela.dyn"?*
>
> *Could you explain it?*
>
> *or we just keep it now?
> *
>
> *Thanks.*
See https://maskray.me/blog/2021-01-18-gnu-indirect-function
".rela.dyn vs .rela.plt"
Conceptually .rela.plt should only have potentially lazy resolved
relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
In the early days things were a bit messy in the implementation, so
some early ports adopting ifunc may use .rela.plt .
GNU ld's PowerPC port apperas to do the right thing.
All lld supported ports do the right thing.
*Fixed. Now R_*_IRELATIVE relocations are only in .rela.dyn.*
*new binutils:*
*https://github.com/loongson/binutils-gdb/tree/dev/new_reloc*
*Thanks a lot.*
在 2022/6/11 上午4:26, Fangrui Song 写道:
>
> On 2022-06-10, caiyinyu wrote:
>> +
>> +#define elf_machine_type_class(type) \
>> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>>
>> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>> seems an unneeded hack for many ports. Can you check does loongarch
>> really need them?
>>
>> *Removed*.
>
> Thanks.
>
>> *>>>>>>>>>>>>>>>*
>>
>> diff --git a/sysdeps/loongarch/dl-machine.h
>> b/sysdeps/loongarch/dl-machine.h
>> index 3beaaee117..500fe71a7e 100644
>> --- a/sysdeps/loongarch/dl-machine.h
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -47,13 +47,7 @@
>> #define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>>
>> #define elf_machine_type_class(type) \
>> - ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT \
>> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>> + ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
>> | (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
>>
>> #define ELF_MACHINE_NO_REL 1
>>
>> *<<<<<<<<<<<<<<<<<<*
>>
>> *
>> *
>>
>> +#define RTLD_START \
>> + asm(".text\n\
>> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
>> + .cfi_label .Ldummy \n\
>> + " CFI_UNDEFINED (1) " \n\
>> + or $a0, $sp, $zero \n\
>> + bl _dl_start \n\
>> + # Stash user entry point in s0. \n\
>> + or $s0, $v0, $zero \n\
>> + # Load the original argument count. \n\
>> + ld.d $a1, $sp, 0 \n\
>> + # Call _dl_init (struct link_map *main_map, int argc, char
>> **argv, \
>> + char **env) \n\
>> + la $a0, _rtld_local \n\
>> + ld.d $a0, $a0, 0 \n\
>> + addi.d $a2, $sp, 8 \n\
>> + slli.d $a3, $a1, 3 \n\
>> + add.d $a3, $a3, $a2 \n\
>> + addi.d $a3, $a3, 8 \n\
>>
>> The _dl_init seems much more complex than the riscv counterpart.
>>
>> *There is no need to simplify further.*
>>
>
> Thanks.
>
>>>>>>>>>>>>>>>>>>>>
>>
>> loongarch:
>>
>> 96 # Call _dl_init (struct link_map *main_map, int argc, char
>> **argv, \
>> 97 char **env) \n\
>> * 98 la $a0, _rtld_local \n\
>> 99 ld.d $a0, $a0, 0 \n\ *
>> *100 addi.d $a2, $sp, 8 \n\ **
>> **101 slli.d $a3, $a1, 3 \n\ **
>> **102 add.d $a3, $a3, $a2 \n\ **
>> **103 addi.d $a3, $a3, 8 \n\*
>> 104 # Stash the stack pointer in s1.\n\
>>
>> riscv:
>>
>> 112 # Call _dl_init (struct link_map *main_map, int argc,
>> char **argv, char **env) \n\
>> *113 " STRINGXP (REG_L) " a0, _rtld_local\n\*
>> *114 add a2, sp, " STRINGXP (SZREG) "\n\**
>> **115 sll a3, a1, " STRINGXP (PTRLOG) "\n\**
>> **116 add a3, a3, a2\n\**
>> **117 add a3, a3, " STRINGXP (SZREG) "\n\*
>> 118 # Stash the stack pointer in s1.\n\
>>
>> <<<<<<<<<<<<<<
>>
>>
>>> + # Adjust $sp for 16-aligned \n\
>>> + srli.d $t0, $sp, 4 \n\
>>> + slli.d $t0, $t0, 4 \n\
>>> + ori $t1, $sp, 0 \n\
>>> + addi.d $sp, $t0, -32 \n\
>>> + st.d $t1, $sp, 24 \n\
>>
>> Seems too complex.
>>
>> *Fixed.*
>
> Thanks.
>
>> *>>>>>>>>>>>>>>>>>>>*
>>
>> *diff --git a/sysdeps/loongarch/dl-machine.h
>> b/sysdeps/loongarch/dl-machine.h
>> index 500fe71a7e..6ec9a403d3 100644
>> --- a/sysdeps/loongarch/dl-machine.h
>> +++ b/sysdeps/loongarch/dl-machine.h
>> @@ -101,16 +101,15 @@ static inline ElfW (Addr) elf_machine_dynamic
>> (void)
>> slli.d $a3, $a1, 3 \n\
>> add.d $a3, $a3, $a2 \n\
>> addi.d $a3, $a3, 8 \n\
>> + # Stash the stack pointer in s1.\n\
>> + or $s1, $sp, $zero \n\
>> # Adjust $sp for 16-aligned \n\
>> - srli.d $t0, $sp, 4 \n\
>> - slli.d $t0, $t0, 4 \n\
>> - ori $t1, $sp, 0 \n\
>> - addi.d $sp, $t0, -32 \n\
>> - st.d $t1, $sp, 24 \n\
>> + bstrins.d $sp, $zero, 3, 0 \n\
>> # Call the function to run the initializers. \n\
>> bl _dl_init \n\
>> + # Restore the stack pointer for _start.\n\
>> + or $sp, $s1, $zero \n\
>> # Pass our finalizer function to _start. \n\
>> - ld.d $sp, $sp, 24 \n\
>> la $a0, _dl_fini \n\
>> # Jump to the user entry point. \n\
>> jirl $zero, $s0, 0 \n\
>> *
>>
>> *<<<<<<<<<<<<<<<<<<*
>>
>>
>> +static inline void __attribute__ ((always_inline))
>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>> + const ElfW (Rela) * reloc,
>> + const ElfW (Sym) * sym,
>>
>> Seems excess space after `*`
>>
>> *Fixed all same problems.*
>
> Thanks.
>
>> + /* Check for unexpected PLT reloc type. */
>> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>> + {
>> + if (__glibc_unlikely (map->l_mach.plt == 0))
>> + {
>> + if (l_addr)
>> + *reloc_addr += l_addr;
>> + }
>> + else
>> + *reloc_addr = map->l_mach.plt;
>> + }
>> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>>
>> This is a design issue of ifunc for many ports.
>> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>> .rela.plt, then you can remove this branch.
>>
>>
>> *Definitely, for riscv, x86 and aarch64..., there are
>> **R_*_IRELATIVEs in their **.rela.plt.*
>>
>> *But I don't understand why "Ideally R_*_IRELATIVE relocations are
>> only in .rela.dyn"?*
>>
>> *Could you explain it?*
>>
>> *or we just keep it now?
>> *
>>
>> *Thanks.*
>
> See https://maskray.me/blog/2021-01-18-gnu-indirect-function
> ".rela.dyn vs .rela.plt"
>
> Conceptually .rela.plt should only have potentially lazy resolved
> relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
> In the early days things were a bit messy in the implementation, so
> some early ports adopting ifunc may use .rela.plt .
> GNU ld's PowerPC port apperas to do the right thing.
> All lld supported ports do the right thing.
>
>> *
>> *
>>
>> 在 2022/6/6 上午7:55, Fangrui Song 写道:
>>> On 2022-06-01, caiyinyu wrote:
>>>> ---
>>>> sysdeps/loongarch/__longjmp.S | 52 ++++
>>>> sysdeps/loongarch/bits/endianness.h | 11 +
>>>> sysdeps/loongarch/bits/link.h | 58 ++++
>>>> sysdeps/loongarch/bits/setjmp.h | 42 +++
>>>> sysdeps/loongarch/bsd-_setjmp.c | 1 +
>>>> sysdeps/loongarch/bsd-setjmp.c | 1 +
>>>> sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
>>>> sysdeps/loongarch/dl-trampoline.S | 91 ++++++
>>>> sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
>>>> sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
>>>> sysdeps/loongarch/ldsodefs.h | 41 +++
>>>> sysdeps/loongarch/linkmap.h | 22 ++
>>>> sysdeps/loongarch/machine-gmon.h | 37 +++
>>>> sysdeps/loongarch/setjmp.S | 66 ++++
>>>> sysdeps/loongarch/sotruss-lib.c | 50 +++
>>>> sysdeps/loongarch/start.S | 67 ++++
>>>> sysdeps/loongarch/sys/asm.h | 59 ++++
>>>> sysdeps/loongarch/tst-audit.h | 23 ++
>>>> sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
>>>> 19 files changed, 1021 insertions(+)
>>>> create mode 100644 sysdeps/loongarch/__longjmp.S
>>>> create mode 100644 sysdeps/loongarch/bits/endianness.h
>>>> create mode 100644 sysdeps/loongarch/bits/link.h
>>>> create mode 100644 sysdeps/loongarch/bits/setjmp.h
>>>> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
>>>> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
>>>> create mode 100644 sysdeps/loongarch/dl-machine.h
>>>> create mode 100644 sysdeps/loongarch/dl-trampoline.S
>>>> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
>>>> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
>>>> create mode 100644 sysdeps/loongarch/ldsodefs.h
>>>> create mode 100644 sysdeps/loongarch/linkmap.h
>>>> create mode 100644 sysdeps/loongarch/machine-gmon.h
>>>> create mode 100644 sysdeps/loongarch/setjmp.S
>>>> create mode 100644 sysdeps/loongarch/sotruss-lib.c
>>>> create mode 100644 sysdeps/loongarch/start.S
>>>> create mode 100644 sysdeps/loongarch/sys/asm.h
>>>> create mode 100644 sysdeps/loongarch/tst-audit.h
>>>> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>>
>>>> diff --git a/sysdeps/loongarch/__longjmp.S
>>>> b/sysdeps/loongarch/__longjmp.S
>>>> new file mode 100644
>>>> index 0000000000..b7690dd94f
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/__longjmp.S
>>>> @@ -0,0 +1,52 @@
>>>> +/* longjmp.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <sysdep.h>
>>>> +#include <sys/asm.h>
>>>> +
>>>> +ENTRY (__longjmp)
>>>> + REG_L ra, a0, 0*SZREG
>>>> + REG_L sp, a0, 1*SZREG
>>>> + REG_L x, a0, 2*SZREG
>>>> + REG_L fp, a0, 3*SZREG
>>>> + REG_L s0, a0, 4*SZREG
>>>> + REG_L s1, a0, 5*SZREG
>>>> + REG_L s2, a0, 6*SZREG
>>>> + REG_L s3, a0, 7*SZREG
>>>> + REG_L s4, a0, 8*SZREG
>>>> + REG_L s5, a0, 9*SZREG
>>>> + REG_L s6, a0, 10*SZREG
>>>> + REG_L s7, a0, 11*SZREG
>>>> + REG_L s8, a0, 12*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> + FREG_L $f24, a0, 13*SZREG + 0*SZFREG
>>>> + FREG_L $f25, a0, 13*SZREG + 1*SZFREG
>>>> + FREG_L $f26, a0, 13*SZREG + 2*SZFREG
>>>> + FREG_L $f27, a0, 13*SZREG + 3*SZFREG
>>>> + FREG_L $f28, a0, 13*SZREG + 4*SZFREG
>>>> + FREG_L $f29, a0, 13*SZREG + 5*SZFREG
>>>> + FREG_L $f30, a0, 13*SZREG + 6*SZFREG
>>>> + FREG_L $f31, a0, 13*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> + sltui a0,a1,1
>>>> + ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
>>>> + jirl zero,ra,0
>>>> +
>>>> +END (__longjmp)
>>>> diff --git a/sysdeps/loongarch/bits/endianness.h
>>>> b/sysdeps/loongarch/bits/endianness.h
>>>> new file mode 100644
>>>> index 0000000000..7290be7b18
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/endianness.h
>>>> @@ -0,0 +1,11 @@
>>>> +#ifndef _BITS_ENDIANNESS_H
>>>> +#define _BITS_ENDIANNESS_H 1
>>>> +
>>>> +#ifndef _BITS_ENDIAN_H
>>>> +#error "Never use <bits/endianness.h> directly; include <endian.h>
>>>> instead."
>>>> +#endif
>>>> +
>>>> +/* LoongArch is little-endian. */
>>>> +#define __BYTE_ORDER __LITTLE_ENDIAN
>>>> +
>>>> +#endif /* bits/endianness.h */
>>>> diff --git a/sysdeps/loongarch/bits/link.h
>>>> b/sysdeps/loongarch/bits/link.h
>>>> new file mode 100644
>>>> index 0000000000..4df09989cb
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/link.h
>>>> @@ -0,0 +1,58 @@
>>>> +/* Machine-specific declarations for dynamic linker interface.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#ifndef _LINK_H
>>>> +#error "Never include <bits/link.h> directly; use <link.h> instead."
>>>> +#endif
>>>> +
>>>> +typedef struct La_loongarch_regs
>>>> +{
>>>> + unsigned long int lr_reg[8]; /* a0 - a7 */
>>>> + double lr_fpreg[8]; /* fa0 - fa7 */
>>>> + unsigned long int lr_ra;
>>>> + unsigned long int lr_sp;
>>>> +} La_loongarch_regs;
>>>> +
>>>> +/* Return values for calls from PLT on LoongArch. */
>>>> +typedef struct La_loongarch_retval
>>>> +{
>>>> + unsigned long int lrv_a0;
>>>> + unsigned long int lrv_a1;
>>>> + double lrv_fa0;
>>>> + double lrv_fa1;
>>>> +} La_loongarch_retval;
>>>> +
>>>> +__BEGIN_DECLS
>>>> +
>>>> +extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
>>>> + unsigned int __ndx,
>>>> + uintptr_t *__refcook,
>>>> + uintptr_t *__defcook,
>>>> + La_loongarch_regs *__regs,
>>>> + unsigned int *__flags,
>>>> + const char *__symname,
>>>> + long int *__framesizep);
>>>> +extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
>>>> + unsigned int __ndx,
>>>> + uintptr_t *__refcook,
>>>> + uintptr_t *__defcook,
>>>> + const La_loongarch_regs *__inregs,
>>>> + La_loongarch_retval *__outregs,
>>>> + const char *__symname);
>>>> +
>>>> +__END_DECLS
>>>> diff --git a/sysdeps/loongarch/bits/setjmp.h
>>>> b/sysdeps/loongarch/bits/setjmp.h
>>>> new file mode 100644
>>>> index 0000000000..8b323ad2b6
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bits/setjmp.h
>>>> @@ -0,0 +1,42 @@
>>>> +/* Define the machine-dependent type `jmp_buf'.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#ifndef _LOONGARCH_BITS_SETJMP_H
>>>> +#define _LOONGARCH_BITS_SETJMP_H
>>>> +
>>>> +typedef struct __jmp_buf_internal_tag
>>>> +{
>>>> + /* Program counter. */
>>>> + long int __pc;
>>>> + /* Stack pointer. */
>>>> + long int __sp;
>>>> + /* Reserved */
>>>> + long int __x;
>>>> + /* Frame pointer. */
>>>> + long int __fp;
>>>> + /* Callee-saved registers. */
>>>> + long int __regs[9];
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> + /* Callee-saved floating point registers. */
>>>> + double __fpregs[8];
>>>> +#endif
>>>> +
>>>> +} __jmp_buf[1];
>>>> +
>>>> +#endif /* _LOONGARCH_BITS_SETJMP_H */
>>>> diff --git a/sysdeps/loongarch/bsd-_setjmp.c
>>>> b/sysdeps/loongarch/bsd-_setjmp.c
>>>> new file mode 100644
>>>> index 0000000000..32f49441c3
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bsd-_setjmp.c
>>>> @@ -0,0 +1 @@
>>>> +/* _setjmp is implemented in setjmp.S. */
>>>> diff --git a/sysdeps/loongarch/bsd-setjmp.c
>>>> b/sysdeps/loongarch/bsd-setjmp.c
>>>> new file mode 100644
>>>> index 0000000000..45fd802aac
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/bsd-setjmp.c
>>>> @@ -0,0 +1 @@
>>>> +/* setjmp is implemented in setjmp.S. */
>>>> diff --git a/sysdeps/loongarch/dl-machine.h
>>>> b/sysdeps/loongarch/dl-machine.h
>>>> new file mode 100644
>>>> index 0000000000..4e19ad9319
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-machine.h
>>>> @@ -0,0 +1,307 @@
>>>> +/* Machine-dependent ELF dynamic relocation inline functions.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> +
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#ifndef dl_machine_h
>>>> +#define dl_machine_h
>>>> +
>>>> +#define ELF_MACHINE_NAME "LoongArch"
>>>> +
>>>> +#include <entry.h>
>>>> +#include <elf/elf.h>
>>>> +#include <sys/asm.h>
>>>> +#include <dl-tls.h>
>>>> +#include <dl-static-tls.h>
>>>> +#include <dl-machine-rel.h>
>>>> +
>>>> +#ifndef _RTLD_PROLOGUE
>>>> +# define _RTLD_PROLOGUE(entry) \
>>>> + ".globl\t" __STRING (entry) "\n\t" \
>>>> + ".type\t" __STRING (entry) ", @function\n\t" \
>>>> + CFI_STARTPROC "\n" \
>>>> + __STRING (entry) ":\n"
>>>> +#endif
>>>> +
>>>> +#ifndef _RTLD_EPILOGUE
>>>> +# define _RTLD_EPILOGUE(entry) \
>>>> + CFI_ENDPROC "\n\t" \
>>>> + ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
>>>> +#endif
>>>> +
>>>> +#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
>>>> +#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>>>> +
>>>> +#define elf_machine_type_class(type) \
>>>> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
>>>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
>>>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
>>>> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
>>>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
>>>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
>>>> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>>>
>>> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
>>> seems an unneeded hack for many ports. Can you check does loongarch
>>> really need them?
>>>
>>>> + | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
>>>> +
>>>> +#define ELF_MACHINE_NO_REL 1
>>>> +#define ELF_MACHINE_NO_RELA 0
>>>> +
>>>> +/* Return nonzero iff ELF header is compatible with the running
>>>> host. */
>>>> +static inline int
>>>> +elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
>>>> +{
>>>> + /* We can only run LoongArch binaries. */
>>>> + if (ehdr->e_machine != EM_LOONGARCH)
>>>> + return 0;
>>>> +
>>>> + return 1;
>>>> +}
>>>> +
>>>> +/* Return the run-time load address of the shared object. */
>>>> +static inline ElfW (Addr) elf_machine_load_address (void)
>>>> +{
>>>> + extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
>>>> + return (ElfW(Addr)) &__ehdr_start;
>>>> +}
>>>> +
>>>> +/* Return the link-time address of _DYNAMIC. */
>>>> +static inline ElfW (Addr) elf_machine_dynamic (void)
>>>> +{
>>>> + extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
>>>> + return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
>>>> +}
>>>> +
>>>> +/* Initial entry point code for the dynamic linker.
>>>> + The C function `_dl_start' is the real entry point;
>>>> + its return value is the user program's entry point. */
>>>> +
>>>> +#define RTLD_START \
>>>> + asm(".text\n\
>>>> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
>>>> + .cfi_label .Ldummy \n\
>>>> + " CFI_UNDEFINED (1) " \n\
>>>> + or $a0, $sp, $zero \n\
>>>> + bl _dl_start \n\
>>>> + # Stash user entry point in s0. \n\
>>>> + or $s0, $v0, $zero \n\
>>>> + # Load the original argument count. \n\
>>>> + ld.d $a1, $sp, 0 \n\
>>>> + # Call _dl_init (struct link_map *main_map, int argc, char
>>>> **argv, \
>>>> + char **env) \n\
>>>> + la $a0, _rtld_local \n\
>>>> + ld.d $a0, $a0, 0 \n\
>>>> + addi.d $a2, $sp, 8 \n\
>>>> + slli.d $a3, $a1, 3 \n\
>>>> + add.d $a3, $a3, $a2 \n\
>>>> + addi.d $a3, $a3, 8 \n\
>>>
>>> The _dl_init seems much more complex than the riscv counterpart.
>>>
>>>> + # Adjust $sp for 16-aligned \n\
>>>> + srli.d $t0, $sp, 4 \n\
>>>> + slli.d $t0, $t0, 4 \n\
>>>> + ori $t1, $sp, 0 \n\
>>>> + addi.d $sp, $t0, -32 \n\
>>>> + st.d $t1, $sp, 24 \n\
>>>
>>> Seems too complex.
>>>
>>>> + # Call the function to run the initializers. \n\
>>>> + bl _dl_init \n\
>>>> + # Pass our finalizer function to _start. \n\
>>>> + ld.d $sp, $sp, 24 \n\
>>>> + la $a0, _dl_fini \n\
>>>> + # Jump to the user entry point. \n\
>>>> + jirl $zero, $s0, 0 \n\
>>>> + " _RTLD_EPILOGUE (ENTRY_POINT) "\
>>>> + .previous");
>>>> +
>>>> +/* Names of the architecture-specific auditing callback
>>>> functions. */
>>>> +#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
>>>> +#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
>>>> +
>>>> +/* Bias .got.plt entry by the offset requested by the PLT header. */
>>>> +#define elf_machine_plt_value(map, reloc, value) (value)
>>>> +
>>>> +static inline ElfW (Addr)
>>>> +elf_machine_fixup_plt (struct link_map *map, lookup_t t,
>>>> + const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
>>>> + const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
>>>> + ElfW (Addr) value)
>>>> +{
>>>> + return *reloc_addr = value;
>>>> +}
>>>> +
>>>> +#endif /* !dl_machine_h */
>>>> +
>>>> +#ifdef RESOLVE_MAP
>>>> +
>>>> +/* Perform a relocation described by R_INFO at the location
>>>> pointed to
>>>> + by RELOC_ADDR. SYM is the relocation symbol specified by
>>>> R_INFO and
>>>> + MAP is the object containing the reloc. */
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
>>>> + const ElfW (Rela) * reloc,
>>>> + const ElfW (Sym) * sym,
>>>
>>> Seems excess space after `*`
>>>
>>>> + const struct r_found_version *version,
>>>> + void *const reloc_addr, int skip_ifunc)
>>>> +{
>>>> + ElfW (Addr) r_info = reloc->r_info;
>>>> + const unsigned long int r_type = ELFW (R_TYPE) (r_info);
>>>> + ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
>>>> + const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
>>>> + struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym,
>>>> version, r_type);
>>>> + ElfW (Addr) value = 0;
>>>> + if (sym_map != NULL)
>>>> + value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
>>>> +
>>>> + if (sym != NULL
>>>> + && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) ==
>>>> STT_GNU_IFUNC)
>>>> + && __glibc_likely (sym->st_shndx != SHN_UNDEF)
>>>> + && __glibc_likely (!skip_ifunc))
>>>> + value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
>>>> +
>>>> + switch (r_type)
>>>> + {
>>>> +#ifndef RTLD_BOOTSTRAP
>>>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
>>>> + R_LARCH_TLS_DTPMOD32:
>>>> + if (sym_map)
>>>> + *addr_field = sym_map->l_tls_modid;
>>>> + break;
>>>
>>> I know many ports do `if (sym_map)` but that seems (a) a workaround
>>> for possibly
>>> GNU ld bugs or (b) unneeded cargo cult.
>>>
>>> The check should better be removed.
>>>
>>> This applies to various TLS dynamic relocations below.
>>>
>>>> +
>>>> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
>>>> + R_LARCH_TLS_DTPREL32:
>>>> + if (sym != NULL)
>>>> + *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
>>>> + break;
>>>> +
>>>> + case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
>>>> + R_LARCH_TLS_TPREL32:
>>>> + if (sym != NULL)
>>>> + {
>>>> + CHECK_STATIC_TLS (map, sym_map);
>>>> + *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
>>>> + }
>>>> + break;
>>>> +
>>>> + case R_LARCH_COPY:
>>>> + {
>>>> + if (sym == NULL)
>>>> + /* This can happen in trace mode if an object could not be
>>>> + found. */
>>>> + break;
>>>> + if (__glibc_unlikely (sym->st_size > refsym->st_size)
>>>> + || (__glibc_unlikely (sym->st_size < refsym->st_size)
>>>> + && GLRO(dl_verbose)))
>>>> + {
>>>> + const char *strtab;
>>>> +
>>>> + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
>>>> + _dl_error_printf ("\
>>>> +%s: Symbol `%s' has different size in shared object, consider
>>>> re-linking\n",
>>>> + rtld_progname ?: "<program name unknown>",
>>>> + strtab + refsym->st_name);
>>>> + }
>>>> + memcpy (reloc_addr, (void *) value,
>>>> + MIN (sym->st_size, refsym->st_size));
>>>> + break;
>>>> + }
>>>> +#endif
>>>> +
>>>> +#if !defined RTLD_BOOTSTRAP
>>>> + case R_LARCH_RELATIVE:
>>>> + *addr_field = map->l_addr + reloc->r_addend;
>>>> + break;
>>>> +#endif
>>>
>>> I think this is copied from riscv but its relocation code is probably
>>> not the best reference. sysdeps/m68k/dl-machine.h may be one of the
>>> better implementations for the relocation switch table.
>>>
>>> In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
>>> needed in this function. There should be none of NONE, RELATIVE,
>>> IRELATIVE, absolute relocation types, etc (RELATIVE is handled
>>> elsewhere).
>>>
>>> GNU ld, in the presence of a bug, may produce spurious NONE
>>> relocations.
>>> Not handling NONE can catch some bugs.
>>>
>>>> + case R_LARCH_JUMP_SLOT:
>>>> + case __WORDSIZE == 64 ? R_LARCH_64:
>>>> + R_LARCH_32:
>>>> + *addr_field = value;
>>>> + break;
>>>> +
>>>> + case R_LARCH_IRELATIVE:
>>>> + value = map->l_addr + reloc->r_addend;
>>>> + if (__glibc_likely (!skip_ifunc))
>>>> + value = ((ElfW (Addr) (*) (void)) value) ();
>>>> + *addr_field = value;
>>>> + break;
>>>> +
>>>> + case R_LARCH_NONE:
>>>> + break;
>>>> +
>>>> + default:
>>>> + _dl_reloc_bad_type (map, r_type, 0);
>>>> + break;
>>>> + }
>>>> +}
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) *
>>>> reloc,
>>>> + void *const reloc_addr)
>>>> +{
>>>> + *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
>>>> +}
>>>> +
>>>> +static inline void __attribute__ ((always_inline))
>>>> +elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem
>>>> *scope[],
>>>> + ElfW (Addr) l_addr,
>>>> + const ElfW (Rela) * reloc, int skip_ifunc)
>>>> +{
>>>> + ElfW (Addr) *const reloc_addr = (void *) (l_addr +
>>>> reloc->r_offset);
>>>> + const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
>>>> +
>>>> + /* Check for unexpected PLT reloc type. */
>>>> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
>>>> + {
>>>> + if (__glibc_unlikely (map->l_mach.plt == 0))
>>>> + {
>>>> + if (l_addr)
>>>> + *reloc_addr += l_addr;
>>>> + }
>>>> + else
>>>> + *reloc_addr = map->l_mach.plt;
>>>> + }
>>>> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>>>
>>> This is a design issue of ifunc for many ports.
>>> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
>>> .rela.plt, then you can remove this branch.
>>>
>>>> + {
>>>> + ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
>>>> + if (__glibc_likely (!skip_ifunc))
>>>> + value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
>>>> + *reloc_addr = (ElfW (Addr)) value;
>>>> + }
>>>> + else
>>>> + _dl_reloc_bad_type (map, r_type, 1);
>>>> +}
>>>> +
>>>> +/* Set up the loaded object described by L so its stub function
>>>> + will jump to the on-demand fixup code __dl_runtime_resolve. */
>>>> +
>>>> +static inline int __attribute__ ((always_inline))
>>>> +elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem
>>>> *scope[],
>>>> + int lazy, int profile)
>>>> +{
>>>> +#ifndef RTLD_BOOTSTRAP
>>>> + /* If using PLTs, fill in the first two entries of .got.plt. */
>>>> + if (l->l_info[DT_JMPREL])
>>>> + {
>>>> + extern void _dl_runtime_resolve (void)
>>>> + __attribute__ ((visibility ("hidden")));
>>>> + ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l,
>>>> l_info[DT_PLTGOT]);
>>>> + gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
>>>> + gotplt[1] = (ElfW (Addr)) l;
>>>> + }
>>>> +#endif
>>>> +
>>>> + return lazy;
>>>> +}
>>>> +
>>>> +#endif /* RESOLVE_MAP */
>>>> diff --git a/sysdeps/loongarch/dl-trampoline.S
>>>> b/sysdeps/loongarch/dl-trampoline.S
>>>> new file mode 100644
>>>> index 0000000000..eb610392f6
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/dl-trampoline.S
>>>> @@ -0,0 +1,91 @@
>>>> +/* PLT trampolines.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <sysdep.h>
>>>> +#include <sys/asm.h>
>>>> +
>>>> +/* Assembler veneer called from the PLT header code for lazy loading.
>>>> + The PLT header passes its own args in t0-t2. */
>>>> +
>>>> +#ifdef __loongarch_soft_float
>>>> +# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
>>>> +#else
>>>> +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
>>>> +#endif
>>>> +
>>>> +ENTRY (_dl_runtime_resolve)
>>>> +
>>>> + /* Save arguments to stack. */
>>>> + ADDI sp, sp, -FRAME_SIZE
>>>> +
>>>> + REG_S ra, sp, 9*SZREG
>>>> + REG_S a0, sp, 1*SZREG
>>>> + REG_S a1, sp, 2*SZREG
>>>> + REG_S a2, sp, 3*SZREG
>>>> + REG_S a3, sp, 4*SZREG
>>>> + REG_S a4, sp, 5*SZREG
>>>> + REG_S a5, sp, 6*SZREG
>>>> + REG_S a6, sp, 7*SZREG
>>>> + REG_S a7, sp, 8*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> + FREG_S fa0, sp, 10*SZREG + 0*SZFREG
>>>> + FREG_S fa1, sp, 10*SZREG + 1*SZFREG
>>>> + FREG_S fa2, sp, 10*SZREG + 2*SZFREG
>>>> + FREG_S fa3, sp, 10*SZREG + 3*SZFREG
>>>> + FREG_S fa4, sp, 10*SZREG + 4*SZFREG
>>>> + FREG_S fa5, sp, 10*SZREG + 5*SZFREG
>>>> + FREG_S fa6, sp, 10*SZREG + 6*SZFREG
>>>> + FREG_S fa7, sp, 10*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> + /* Update .got.plt and obtain runtime address of callee */
>>>> + SLLI a1, t1, 1
>>>> + or a0, t0, zero
>>>> + ADD a1, a1, t1
>>>> + la a2, _dl_fixup
>>>> + jirl ra, a2, 0
>>>> + or t1, v0, zero
>>>> +
>>>> + /* Restore arguments from stack. */
>>>> + REG_L ra, sp, 9*SZREG
>>>> + REG_L a0, sp, 1*SZREG
>>>> + REG_L a1, sp, 2*SZREG
>>>> + REG_L a2, sp, 3*SZREG
>>>> + REG_L a3, sp, 4*SZREG
>>>> + REG_L a4, sp, 5*SZREG
>>>> + REG_L a5, sp, 6*SZREG
>>>> + REG_L a6, sp, 7*SZREG
>>>> + REG_L a7, sp, 8*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> + FREG_L fa0, sp, 10*SZREG + 0*SZFREG
>>>> + FREG_L fa1, sp, 10*SZREG + 1*SZFREG
>>>> + FREG_L fa2, sp, 10*SZREG + 2*SZFREG
>>>> + FREG_L fa3, sp, 10*SZREG + 3*SZFREG
>>>> + FREG_L fa4, sp, 10*SZREG + 4*SZFREG
>>>> + FREG_L fa5, sp, 10*SZREG + 5*SZFREG
>>>> + FREG_L fa6, sp, 10*SZREG + 6*SZFREG
>>>> + FREG_L fa7, sp, 10*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> + ADDI sp, sp, FRAME_SIZE
>>>> +
>>>> + /* Invoke the callee. */
>>>> + jirl zero, t1, 0
>>>> +END (_dl_runtime_resolve)
>>>> diff --git a/sysdeps/loongarch/jmpbuf-offsets.h
>>>> b/sysdeps/loongarch/jmpbuf-offsets.h
>>>> new file mode 100644
>>>> index 0000000000..a4b8ea690e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/jmpbuf-offsets.h
>>>> @@ -0,0 +1,22 @@
>>>> +/* Private macros for accessing __jmp_buf contents.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> License as
>>>> + published by the Free Software Foundation; either version 2.1
>>>> of the
>>>> + License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <jmpbuf-unwind.h>
>>>> +
>>>> +/* Helper for generic ____longjmp_chk(). */
>>>> +#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
>>>> diff --git a/sysdeps/loongarch/jmpbuf-unwind.h
>>>> b/sysdeps/loongarch/jmpbuf-unwind.h
>>>> new file mode 100644
>>>> index 0000000000..6fa509151d
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/jmpbuf-unwind.h
>>>> @@ -0,0 +1,45 @@
>>>> +/* Examine __jmp_buf for unwinding frames.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <setjmp.h>
>>>> +#include <stdint.h>
>>>> +#include <unwind.h>
>>>> +#include <sysdep.h>
>>>> +
>>>> +/* Test if longjmp to JMPBUF would unwind the frame
>>>> + containing a local variable at ADDRESS. */
>>>> +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
>>>> + ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
>>>> +
>>>> +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
>>>> + _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA
>>>> (_context), _adj)
>>>> +
>>>> +static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp
>>>> (__jmp_buf regs)
>>>> +{
>>>> + uintptr_t sp = regs[0].__sp;
>>>> +#ifdef PTR_DEMANGLE
>>>> + PTR_DEMANGLE (sp);
>>>> +#endif
>>>> + return sp;
>>>> +}
>>>> +
>>>> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
>>>> + ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
>>>> +
>>>> +/* We use the normal longjmp for unwinding. */
>>>> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
>>>> diff --git a/sysdeps/loongarch/ldsodefs.h
>>>> b/sysdeps/loongarch/ldsodefs.h
>>>> new file mode 100644
>>>> index 0000000000..36b1b25b9f
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/ldsodefs.h
>>>> @@ -0,0 +1,41 @@
>>>> +/* Run-time dynamic linker data structures for loaded ELF shared
>>>> objects.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#ifndef _LOONGARCH_LDSODEFS_H
>>>> +#define _LOONGARCH_LDSODEFS_H 1
>>>> +
>>>> +#include <elf.h>
>>>> +
>>>> +struct La_loongarch_regs;
>>>> +struct La_loongarch_retval;
>>>> +
>>>> +#define ARCH_PLTENTER_MEMBERS \
>>>> + ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned
>>>> int, \
>>>> + uintptr_t *, uintptr_t *, \
>>>> + const struct La_loongarch_regs *, \
>>>> + unsigned int *, const char *name, \
>>>> + long int *framesizep);
>>>> +
>>>> +#define ARCH_PLTEXIT_MEMBERS \
>>>> + unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned
>>>> int, \
>>>> + uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
>>>> + struct La_loongarch_retval *, const char *);
>>>> +
>>>> +#include_next <ldsodefs.h>
>>>> +
>>>> +#endif
>>>> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
>>>> new file mode 100644
>>>> index 0000000000..bbba73ed70
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/linkmap.h
>>>> @@ -0,0 +1,22 @@
>>>> +/* Definition of link_map_machine.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +struct link_map_machine
>>>> +{
>>>> + ElfW (Addr) plt; /* Address of .plt. */
>>>> +};
>>>> diff --git a/sysdeps/loongarch/machine-gmon.h
>>>> b/sysdeps/loongarch/machine-gmon.h
>>>> new file mode 100644
>>>> index 0000000000..4a3cdd964e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/machine-gmon.h
>>>> @@ -0,0 +1,37 @@
>>>> +/* LoongArch definitions for profiling support.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library; if not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +/* Accept 'frompc' address as argument from the function that calls
>>>> + _mcount for profiling. Use __builtin_return_address (0)
>>>> + for the 'selfpc' address. */
>>>> +
>>>> +#include <sysdep.h>
>>>> +
>>>> +static void mcount_internal (unsigned long int frompc,
>>>> + unsigned long int selfpc);
>>>> +
>>>> +#define _MCOUNT_DECL(frompc, selfpc) \
>>>> + static inline void mcount_internal (unsigned long int frompc, \
>>>> + unsigned long int selfpc)
>>>> +
>>>> +#define MCOUNT \
>>>> + void _mcount (void *frompc) \
>>>> + { \
>>>> + mcount_internal ((unsigned long int) frompc, \
>>>> + (unsigned long int) RETURN_ADDRESS (0)); \
>>>> + }
>>>> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
>>>> new file mode 100644
>>>> index 0000000000..b93ae2f5da
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/setjmp.S
>>>> @@ -0,0 +1,66 @@
>>>> +/* setjmp for LoongArch.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <sysdep.h>
>>>> +#include <sys/asm.h>
>>>> +
>>>> +ENTRY (_setjmp)
>>>> + li.w a1,0
>>>> + b __sigsetjmp
>>>> +END (_setjmp)
>>>> +
>>>> +ENTRY (setjmp)
>>>> + li.w a1,1
>>>> +END (setjmp)
>>>> +
>>>> +ENTRY (__sigsetjmp)
>>>> + REG_S ra, a0, 0*SZREG
>>>> + REG_S sp, a0, 1*SZREG
>>>> + REG_S x, a0, 2*SZREG
>>>> + REG_S fp, a0, 3*SZREG
>>>> + REG_S s0, a0, 4*SZREG
>>>> + REG_S s1, a0, 5*SZREG
>>>> + REG_S s2, a0, 6*SZREG
>>>> + REG_S s3, a0, 7*SZREG
>>>> + REG_S s4, a0, 8*SZREG
>>>> + REG_S s5, a0, 9*SZREG
>>>> + REG_S s6, a0, 10*SZREG
>>>> + REG_S s7, a0, 11*SZREG
>>>> + REG_S s8, a0, 12*SZREG
>>>> +
>>>> +#ifndef __loongarch_soft_float
>>>> + FREG_S $f24, a0, 13*SZREG + 0*SZFREG
>>>> + FREG_S $f25, a0, 13*SZREG + 1*SZFREG
>>>> + FREG_S $f26, a0, 13*SZREG + 2*SZFREG
>>>> + FREG_S $f27, a0, 13*SZREG + 3*SZFREG
>>>> + FREG_S $f28, a0, 13*SZREG + 4*SZFREG
>>>> + FREG_S $f29, a0, 13*SZREG + 5*SZFREG
>>>> + FREG_S $f30, a0, 13*SZREG + 6*SZFREG
>>>> + FREG_S $f31, a0, 13*SZREG + 7*SZFREG
>>>> +#endif
>>>> +
>>>> +#if !IS_IN (libc) && IS_IN(rtld)
>>>> + li.w v0, 0
>>>> + jirl zero,ra,0
>>>> +#else
>>>> + b __sigjmp_save
>>>> +#endif
>>>> +END (__sigsetjmp)
>>>> +
>>>> +hidden_def (__sigsetjmp)
>>>> +weak_alias (_setjmp, __GI__setjmp)
>>>> diff --git a/sysdeps/loongarch/sotruss-lib.c
>>>> b/sysdeps/loongarch/sotruss-lib.c
>>>> new file mode 100644
>>>> index 0000000000..5b15f4815a
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/sotruss-lib.c
>>>> @@ -0,0 +1,50 @@
>>>> +/* Override generic sotruss-lib.c to define actual functions for
>>>> LoongArch.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#define HAVE_ARCH_PLTENTER
>>>> +#define HAVE_ARCH_PLTEXIT
>>>> +
>>>> +#include <elf/sotruss-lib.c>
>>>> +
>>>> +ElfW (Addr)
>>>> +la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
>>>> + unsigned int ndx __attribute__ ((unused)),
>>>> + uintptr_t *refcook, uintptr_t *defcook,
>>>> + La_loongarch_regs *regs, unsigned int *flags,
>>>> + const char *symname, long int *framesizep)
>>>> +{
>>>> + print_enter (refcook, defcook, symname, regs->lr_reg[0],
>>>> regs->lr_reg[1],
>>>> + regs->lr_reg[2], *flags);
>>>> +
>>>> + /* No need to copy anything, we will not need the parameters in
>>>> any case. */
>>>> + *framesizep = 0;
>>>> +
>>>> + return sym->st_value;
>>>> +}
>>>> +
>>>> +unsigned int
>>>> +la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
>>>> + uintptr_t *refcook, uintptr_t *defcook,
>>>> + const struct La_loongarch_regs *inregs,
>>>> + struct La_loongarch_retval *outregs,
>>>> + const char *symname)
>>>> +{
>>>> + print_exit (refcook, defcook, symname, outregs->lrv_a0);
>>>> +
>>>> + return 0;
>>>> +}
>>>> diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
>>>> new file mode 100644
>>>> index 0000000000..a9b32aa966
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/start.S
>>>> @@ -0,0 +1,67 @@
>>>> +/* Startup code compliant to the ELF LoongArch ABI.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#define __ASSEMBLY__ 1
>>>> +#include <entry.h>
>>>> +#include <sys/asm.h>
>>>> +
>>>> +/* The entry point's job is to call __libc_start_main. Per the ABI,
>>>> + a0 contains the address of a function to be passed to atexit.
>>>> + __libc_start_main wants this in a5. */
>>>> +
>>>> +/*
>>>> +int
>>>> +__libc_start_main (int (*main) (int, char **, char **),
>>>> + int argc,
>>>> + char **argv,
>>>> + __typeof (main) init,
>>>> + void (*fini) (void),
>>>> + void (*rtld_fini) (void),
>>>> + void *stack_end);
>>>> + */
>>>> +
>>>> +ENTRY (ENTRY_POINT)
>>>> +
>>>> +/* Terminate call stack by noting ra is undefined. Use a dummy
>>>> + .cfi_label to force starting the FDE. */
>>>> + .cfi_label .Ldummy
>>>> + cfi_undefined (1)
>>>> + or a5, a0, zero /* rtld_fini */
>>>> +
>>>> +/* We must get symbol main through GOT table, since main may not
>>>> be local.
>>>> + For instance: googletest defines main in dynamic library. */
>>>> + la.got a0, t0, main
>>>> + REG_L a1, sp, 0
>>>> + ADDI a2, sp, SZREG
>>>> +
>>>> + /* Adjust $sp for 16-aligned */
>>>> + SRLI sp, sp, 4
>>>> + SLLI sp, sp, 4
>>>> +
>>>> + move a3, zero /* used to be init */
>>>> + move a4, zero /* used to be fini */
>>>> + or a6, sp, zero /* stack_end */
>>>> +
>>>> + la.got ra, t0, __libc_start_main
>>>> + jirl ra, ra, 0
>>>> +
>>>> + la.got ra, t0, abort
>>>> + jirl ra, ra, 0
>>>> +END (ENTRY_POINT)
>>>> +
>>>> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
>>>> new file mode 100644
>>>> index 0000000000..b41ee59694
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/sys/asm.h
>>>> @@ -0,0 +1,59 @@
>>>> +/* Miscellaneous macros.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#ifndef _SYS_ASM_H
>>>> +#define _SYS_ASM_H
>>>> +
>>>> +#include <sys/regdef.h>
>>>> +#include <sysdeps/generic/sysdep.h>
>>>> +
>>>> +/* Macros to handle different pointer/register sizes for 32/64-bit
>>>> code. */
>>>> +#define SZREG 8
>>>> +#define SZFREG 8
>>>> +#define REG_L ld.d
>>>> +#define REG_S st.d
>>>> +#define SRLI srli.d
>>>> +#define SLLI slli.d
>>>> +#define ADDI addi.d
>>>> +#define ADD add.d
>>>> +#define BSTRINS bstrins.d
>>>> +#define LI li.d
>>>> +#define FREG_L fld.d
>>>> +#define FREG_S fst.d
>>>> +
>>>> +/* Declare leaf routine. */
>>>> +#define LEAF(symbol) \
>>>> + .text; \
>>>> + .globl symbol; \
>>>> + .align 3; \
>>>> + cfi_startproc; \
>>>> + .type symbol, @function; \
>>>> + symbol:
>>>> +
>>>> +#define ENTRY(symbol) LEAF (symbol)
>>>> +
>>>> +/* Mark end of function. */
>>>> +#undef END
>>>> +#define END(function) \
>>>> + cfi_endproc; \
>>>> + .size function, .- function;
>>>> +
>>>> +/* Stack alignment. */
>>>> +#define ALMASK ~15
>>>> +
>>>> +#endif /* sys/asm.h */
>>>> diff --git a/sysdeps/loongarch/tst-audit.h
>>>> b/sysdeps/loongarch/tst-audit.h
>>>> new file mode 100644
>>>> index 0000000000..e71948c86e
>>>> --- /dev/null
>>>> +++ b/sysdeps/loongarch/tst-audit.h
>>>> @@ -0,0 +1,23 @@
>>>> +/* Definitions for testing PLT entry/exit auditing.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <https://www.gnu.org/licenses/>. */
>>>> +
>>>> +#define pltenter la_loongarch_gnu_pltenter
>>>> +#define pltexit la_loongarch_gnu_pltexit
>>>> +#define La_regs La_loongarch_regs
>>>> +#define La_retval La_loongarch_retval
>>>> +#define int_retval lrv_a0
>>>> diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>> b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>> new file mode 100644
>>>> index 0000000000..4887c30ca2
>>>> --- /dev/null
>>>> +++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>>>> @@ -0,0 +1,26 @@
>>>> +/* ldconfig default paths and libraries.
>>>> + Copyright (C) 2022 Free Software Foundation, Inc.
>>>> + This file is part of the GNU C Library.
>>>> +
>>>> + The GNU C Library is free software; you can redistribute it and/or
>>>> + modify it under the terms of the GNU Lesser General Public
>>>> + License as published by the Free Software Foundation; either
>>>> + version 2.1 of the License, or (at your option) any later version.
>>>> +
>>>> + The GNU C Library is distributed in the hope that it will be
>>>> useful,
>>>> + but WITHOUT ANY WARRANTY; without even the implied warranty of
>>>> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
>>>> + Lesser General Public License for more details.
>>>> +
>>>> + You should have received a copy of the GNU Lesser General Public
>>>> + License along with the GNU C Library. If not, see
>>>> + <http://www.gnu.org/licenses/>. */
>>>> +
>>>> +#include <sysdeps/generic/ldconfig.h>
>>>> +
>>>> +#define SYSDEP_KNOWN_INTERPRETER_NAMES \
>>>> + { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
>>>> +
>>>> +#define SYSDEP_KNOWN_LIBRARY_NAMES \
>>>> + { "libc.so.6", FLAG_ELF_LIBC6 }, \
>>>> + { "libm.so.6", FLAG_ELF_LIBC6 },
>>>> --
>>>> 2.31.1
>>>>
On Thu, Jul 7, 2022 at 11:49 PM caiyinyu <caiyinyu@loongson.cn> wrote:
>
> + /* Check for unexpected PLT reloc type. */
> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
> + {
> + if (__glibc_unlikely (map->l_mach.plt == 0))
> + {
> + if (l_addr)
> + *reloc_addr += l_addr;
> + }
> + else
> + *reloc_addr = map->l_mach.plt;
> + }
> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>
> *Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs in their **.rela.plt.*
>
> *But I don't understand why "Ideally R_*_IRELATIVE relocations are only in .rela.dyn"?*
>
> *Could you explain it?*
>
> *or we just keep it now?
> *
>
> *Thanks.*
>
>
> See https://maskray.me/blog/2021-01-18-gnu-indirect-function
> ".rela.dyn vs .rela.plt"
>
> Conceptually .rela.plt should only have potentially lazy resolved
> relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
> In the early days things were a bit messy in the implementation, so
> some early ports adopting ifunc may use .rela.plt .
> GNU ld's PowerPC port apperas to do the right thing.
> All lld supported ports do the right thing.
>
>
> Fixed. Now R_*_IRELATIVE relocations are only in .rela.dyn.
>
> new binutils:
>
> https://github.com/loongson/binutils-gdb/tree/dev/new_reloc
>
> Thanks a lot.
Great, thanks! So the glibc port can be simplified a bit :)
>
>
>
> 在 2022/6/11 上午4:26, Fangrui Song 写道:
>
>
> On 2022-06-10, caiyinyu wrote:
>
> +
> +#define elf_machine_type_class(type) \
> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>
> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
> seems an unneeded hack for many ports. Can you check does loongarch
> really need them?
>
> *Removed*.
>
>
> Thanks.
>
> *>>>>>>>>>>>>>>>*
>
> diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
> index 3beaaee117..500fe71a7e 100644
> --- a/sysdeps/loongarch/dl-machine.h
> +++ b/sysdeps/loongarch/dl-machine.h
> @@ -47,13 +47,7 @@
> #define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
>
> #define elf_machine_type_class(type) \
> - ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT \
> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
> - || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
> - || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
> + ((ELF_RTYPE_CLASS_PLT *((type) == ELF_MACHINE_JMP_SLOT)) \
> | (ELF_RTYPE_CLASS_COPY *((type) == R_LARCH_COPY)))
>
> #define ELF_MACHINE_NO_REL 1
>
> *<<<<<<<<<<<<<<<<<<*
>
> *
> *
>
> +#define RTLD_START \
> + asm(".text\n\
> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
> + .cfi_label .Ldummy \n\
> + " CFI_UNDEFINED (1) " \n\
> + or $a0, $sp, $zero \n\
> + bl _dl_start \n\
> + # Stash user entry point in s0. \n\
> + or $s0, $v0, $zero \n\
> + # Load the original argument count. \n\
> + ld.d $a1, $sp, 0 \n\
> + # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
> + char **env) \n\
> + la $a0, _rtld_local \n\
> + ld.d $a0, $a0, 0 \n\
> + addi.d $a2, $sp, 8 \n\
> + slli.d $a3, $a1, 3 \n\
> + add.d $a3, $a3, $a2 \n\
> + addi.d $a3, $a3, 8 \n\
>
> The _dl_init seems much more complex than the riscv counterpart.
>
> *There is no need to simplify further.*
>
>
> Thanks.
>
>
>
> loongarch:
>
> 96 # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
> 97 char **env) \n\
> * 98 la $a0, _rtld_local \n\
> 99 ld.d $a0, $a0, 0 \n\ *
> *100 addi.d $a2, $sp, 8 \n\ **
> **101 slli.d $a3, $a1, 3 \n\ **
> **102 add.d $a3, $a3, $a2 \n\ **
> **103 addi.d $a3, $a3, 8 \n\*
> 104 # Stash the stack pointer in s1.\n\
>
> riscv:
>
> 112 # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
> *113 " STRINGXP (REG_L) " a0, _rtld_local\n\*
> *114 add a2, sp, " STRINGXP (SZREG) "\n\**
> **115 sll a3, a1, " STRINGXP (PTRLOG) "\n\**
> **116 add a3, a3, a2\n\**
> **117 add a3, a3, " STRINGXP (SZREG) "\n\*
> 118 # Stash the stack pointer in s1.\n\
>
> <<<<<<<<<<<<<<
>
>
> + # Adjust $sp for 16-aligned \n\
> + srli.d $t0, $sp, 4 \n\
> + slli.d $t0, $t0, 4 \n\
> + ori $t1, $sp, 0 \n\
> + addi.d $sp, $t0, -32 \n\
> + st.d $t1, $sp, 24 \n\
>
>
> Seems too complex.
>
> *Fixed.*
>
>
> Thanks.
>
> *>>>>>>>>>>>>>>>>>>>*
>
> *diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
> index 500fe71a7e..6ec9a403d3 100644
> --- a/sysdeps/loongarch/dl-machine.h
> +++ b/sysdeps/loongarch/dl-machine.h
> @@ -101,16 +101,15 @@ static inline ElfW (Addr) elf_machine_dynamic (void)
> slli.d $a3, $a1, 3 \n\
> add.d $a3, $a3, $a2 \n\
> addi.d $a3, $a3, 8 \n\
> + # Stash the stack pointer in s1.\n\
> + or $s1, $sp, $zero \n\
> # Adjust $sp for 16-aligned \n\
> - srli.d $t0, $sp, 4 \n\
> - slli.d $t0, $t0, 4 \n\
> - ori $t1, $sp, 0 \n\
> - addi.d $sp, $t0, -32 \n\
> - st.d $t1, $sp, 24 \n\
> + bstrins.d $sp, $zero, 3, 0 \n\
> # Call the function to run the initializers. \n\
> bl _dl_init \n\
> + # Restore the stack pointer for _start.\n\
> + or $sp, $s1, $zero \n\
> # Pass our finalizer function to _start. \n\
> - ld.d $sp, $sp, 24 \n\
> la $a0, _dl_fini \n\
> # Jump to the user entry point. \n\
> jirl $zero, $s0, 0 \n\
> *
>
> *<<<<<<<<<<<<<<<<<<*
>
>
> +static inline void __attribute__ ((always_inline))
> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
> + const ElfW (Rela) * reloc,
> + const ElfW (Sym) * sym,
>
> Seems excess space after `*`
>
> *Fixed all same problems.*
>
>
> Thanks.
>
> + /* Check for unexpected PLT reloc type. */
> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
> + {
> + if (__glibc_unlikely (map->l_mach.plt == 0))
> + {
> + if (l_addr)
> + *reloc_addr += l_addr;
> + }
> + else
> + *reloc_addr = map->l_mach.plt;
> + }
> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
>
> *Definitely, for riscv, x86 and aarch64..., there are **R_*_IRELATIVEs in their **.rela.plt.*
>
> *But I don't understand why "Ideally R_*_IRELATIVE relocations are only in .rela.dyn"?*
>
> *Could you explain it?*
>
> *or we just keep it now?
> *
>
> *Thanks.*
>
>
> See https://maskray.me/blog/2021-01-18-gnu-indirect-function
> ".rela.dyn vs .rela.plt"
>
> Conceptually .rela.plt should only have potentially lazy resolved
> relocations. IRELATIVE are always eager, so .rela.plt isn't applicable.
> In the early days things were a bit messy in the implementation, so
> some early ports adopting ifunc may use .rela.plt .
> GNU ld's PowerPC port apperas to do the right thing.
> All lld supported ports do the right thing.
>
> *
> *
>
> 在 2022/6/6 上午7:55, Fangrui Song 写道:
>
> On 2022-06-01, caiyinyu wrote:
>
> ---
> sysdeps/loongarch/__longjmp.S | 52 ++++
> sysdeps/loongarch/bits/endianness.h | 11 +
> sysdeps/loongarch/bits/link.h | 58 ++++
> sysdeps/loongarch/bits/setjmp.h | 42 +++
> sysdeps/loongarch/bsd-_setjmp.c | 1 +
> sysdeps/loongarch/bsd-setjmp.c | 1 +
> sysdeps/loongarch/dl-machine.h | 307 +++++++++++++++++++
> sysdeps/loongarch/dl-trampoline.S | 91 ++++++
> sysdeps/loongarch/jmpbuf-offsets.h | 22 ++
> sysdeps/loongarch/jmpbuf-unwind.h | 45 +++
> sysdeps/loongarch/ldsodefs.h | 41 +++
> sysdeps/loongarch/linkmap.h | 22 ++
> sysdeps/loongarch/machine-gmon.h | 37 +++
> sysdeps/loongarch/setjmp.S | 66 ++++
> sysdeps/loongarch/sotruss-lib.c | 50 +++
> sysdeps/loongarch/start.S | 67 ++++
> sysdeps/loongarch/sys/asm.h | 59 ++++
> sysdeps/loongarch/tst-audit.h | 23 ++
> sysdeps/unix/sysv/linux/loongarch/ldconfig.h | 26 ++
> 19 files changed, 1021 insertions(+)
> create mode 100644 sysdeps/loongarch/__longjmp.S
> create mode 100644 sysdeps/loongarch/bits/endianness.h
> create mode 100644 sysdeps/loongarch/bits/link.h
> create mode 100644 sysdeps/loongarch/bits/setjmp.h
> create mode 100644 sysdeps/loongarch/bsd-_setjmp.c
> create mode 100644 sysdeps/loongarch/bsd-setjmp.c
> create mode 100644 sysdeps/loongarch/dl-machine.h
> create mode 100644 sysdeps/loongarch/dl-trampoline.S
> create mode 100644 sysdeps/loongarch/jmpbuf-offsets.h
> create mode 100644 sysdeps/loongarch/jmpbuf-unwind.h
> create mode 100644 sysdeps/loongarch/ldsodefs.h
> create mode 100644 sysdeps/loongarch/linkmap.h
> create mode 100644 sysdeps/loongarch/machine-gmon.h
> create mode 100644 sysdeps/loongarch/setjmp.S
> create mode 100644 sysdeps/loongarch/sotruss-lib.c
> create mode 100644 sysdeps/loongarch/start.S
> create mode 100644 sysdeps/loongarch/sys/asm.h
> create mode 100644 sysdeps/loongarch/tst-audit.h
> create mode 100644 sysdeps/unix/sysv/linux/loongarch/ldconfig.h
>
> diff --git a/sysdeps/loongarch/__longjmp.S b/sysdeps/loongarch/__longjmp.S
> new file mode 100644
> index 0000000000..b7690dd94f
> --- /dev/null
> +++ b/sysdeps/loongarch/__longjmp.S
> @@ -0,0 +1,52 @@
> +/* longjmp.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +#include <sys/asm.h>
> +
> +ENTRY (__longjmp)
> + REG_L ra, a0, 0*SZREG
> + REG_L sp, a0, 1*SZREG
> + REG_L x, a0, 2*SZREG
> + REG_L fp, a0, 3*SZREG
> + REG_L s0, a0, 4*SZREG
> + REG_L s1, a0, 5*SZREG
> + REG_L s2, a0, 6*SZREG
> + REG_L s3, a0, 7*SZREG
> + REG_L s4, a0, 8*SZREG
> + REG_L s5, a0, 9*SZREG
> + REG_L s6, a0, 10*SZREG
> + REG_L s7, a0, 11*SZREG
> + REG_L s8, a0, 12*SZREG
> +
> +#ifndef __loongarch_soft_float
> + FREG_L $f24, a0, 13*SZREG + 0*SZFREG
> + FREG_L $f25, a0, 13*SZREG + 1*SZFREG
> + FREG_L $f26, a0, 13*SZREG + 2*SZFREG
> + FREG_L $f27, a0, 13*SZREG + 3*SZFREG
> + FREG_L $f28, a0, 13*SZREG + 4*SZFREG
> + FREG_L $f29, a0, 13*SZREG + 5*SZFREG
> + FREG_L $f30, a0, 13*SZREG + 6*SZFREG
> + FREG_L $f31, a0, 13*SZREG + 7*SZFREG
> +#endif
> +
> + sltui a0,a1,1
> + ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
> + jirl zero,ra,0
> +
> +END (__longjmp)
> diff --git a/sysdeps/loongarch/bits/endianness.h b/sysdeps/loongarch/bits/endianness.h
> new file mode 100644
> index 0000000000..7290be7b18
> --- /dev/null
> +++ b/sysdeps/loongarch/bits/endianness.h
> @@ -0,0 +1,11 @@
> +#ifndef _BITS_ENDIANNESS_H
> +#define _BITS_ENDIANNESS_H 1
> +
> +#ifndef _BITS_ENDIAN_H
> +#error "Never use <bits/endianness.h> directly; include <endian.h> instead."
> +#endif
> +
> +/* LoongArch is little-endian. */
> +#define __BYTE_ORDER __LITTLE_ENDIAN
> +
> +#endif /* bits/endianness.h */
> diff --git a/sysdeps/loongarch/bits/link.h b/sysdeps/loongarch/bits/link.h
> new file mode 100644
> index 0000000000..4df09989cb
> --- /dev/null
> +++ b/sysdeps/loongarch/bits/link.h
> @@ -0,0 +1,58 @@
> +/* Machine-specific declarations for dynamic linker interface.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _LINK_H
> +#error "Never include <bits/link.h> directly; use <link.h> instead."
> +#endif
> +
> +typedef struct La_loongarch_regs
> +{
> + unsigned long int lr_reg[8]; /* a0 - a7 */
> + double lr_fpreg[8]; /* fa0 - fa7 */
> + unsigned long int lr_ra;
> + unsigned long int lr_sp;
> +} La_loongarch_regs;
> +
> +/* Return values for calls from PLT on LoongArch. */
> +typedef struct La_loongarch_retval
> +{
> + unsigned long int lrv_a0;
> + unsigned long int lrv_a1;
> + double lrv_fa0;
> + double lrv_fa1;
> +} La_loongarch_retval;
> +
> +__BEGIN_DECLS
> +
> +extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
> + unsigned int __ndx,
> + uintptr_t *__refcook,
> + uintptr_t *__defcook,
> + La_loongarch_regs *__regs,
> + unsigned int *__flags,
> + const char *__symname,
> + long int *__framesizep);
> +extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
> + unsigned int __ndx,
> + uintptr_t *__refcook,
> + uintptr_t *__defcook,
> + const La_loongarch_regs *__inregs,
> + La_loongarch_retval *__outregs,
> + const char *__symname);
> +
> +__END_DECLS
> diff --git a/sysdeps/loongarch/bits/setjmp.h b/sysdeps/loongarch/bits/setjmp.h
> new file mode 100644
> index 0000000000..8b323ad2b6
> --- /dev/null
> +++ b/sysdeps/loongarch/bits/setjmp.h
> @@ -0,0 +1,42 @@
> +/* Define the machine-dependent type `jmp_buf'.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _LOONGARCH_BITS_SETJMP_H
> +#define _LOONGARCH_BITS_SETJMP_H
> +
> +typedef struct __jmp_buf_internal_tag
> +{
> + /* Program counter. */
> + long int __pc;
> + /* Stack pointer. */
> + long int __sp;
> + /* Reserved */
> + long int __x;
> + /* Frame pointer. */
> + long int __fp;
> + /* Callee-saved registers. */
> + long int __regs[9];
> +
> +#ifndef __loongarch_soft_float
> + /* Callee-saved floating point registers. */
> + double __fpregs[8];
> +#endif
> +
> +} __jmp_buf[1];
> +
> +#endif /* _LOONGARCH_BITS_SETJMP_H */
> diff --git a/sysdeps/loongarch/bsd-_setjmp.c b/sysdeps/loongarch/bsd-_setjmp.c
> new file mode 100644
> index 0000000000..32f49441c3
> --- /dev/null
> +++ b/sysdeps/loongarch/bsd-_setjmp.c
> @@ -0,0 +1 @@
> +/* _setjmp is implemented in setjmp.S. */
> diff --git a/sysdeps/loongarch/bsd-setjmp.c b/sysdeps/loongarch/bsd-setjmp.c
> new file mode 100644
> index 0000000000..45fd802aac
> --- /dev/null
> +++ b/sysdeps/loongarch/bsd-setjmp.c
> @@ -0,0 +1 @@
> +/* setjmp is implemented in setjmp.S. */
> diff --git a/sysdeps/loongarch/dl-machine.h b/sysdeps/loongarch/dl-machine.h
> new file mode 100644
> index 0000000000..4e19ad9319
> --- /dev/null
> +++ b/sysdeps/loongarch/dl-machine.h
> @@ -0,0 +1,307 @@
> +/* Machine-dependent ELF dynamic relocation inline functions.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> +
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef dl_machine_h
> +#define dl_machine_h
> +
> +#define ELF_MACHINE_NAME "LoongArch"
> +
> +#include <entry.h>
> +#include <elf/elf.h>
> +#include <sys/asm.h>
> +#include <dl-tls.h>
> +#include <dl-static-tls.h>
> +#include <dl-machine-rel.h>
> +
> +#ifndef _RTLD_PROLOGUE
> +# define _RTLD_PROLOGUE(entry) \
> + ".globl\t" __STRING (entry) "\n\t" \
> + ".type\t" __STRING (entry) ", @function\n\t" \
> + CFI_STARTPROC "\n" \
> + __STRING (entry) ":\n"
> +#endif
> +
> +#ifndef _RTLD_EPILOGUE
> +# define _RTLD_EPILOGUE(entry) \
> + CFI_ENDPROC "\n\t" \
> + ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
> +#endif
> +
> +#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
> +#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
> +
> +#define elf_machine_type_class(type) \
> + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
> + || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
> + || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
>
>
> Placing TLS dynamic relocations in the ELF_RTYPE_CLASS_PLT list
> seems an unneeded hack for many ports. Can you check does loongarch
> really need them?
>
> + | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
> +
> +#define ELF_MACHINE_NO_REL 1
> +#define ELF_MACHINE_NO_RELA 0
> +
> +/* Return nonzero iff ELF header is compatible with the running host. */
> +static inline int
> +elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
> +{
> + /* We can only run LoongArch binaries. */
> + if (ehdr->e_machine != EM_LOONGARCH)
> + return 0;
> +
> + return 1;
> +}
> +
> +/* Return the run-time load address of the shared object. */
> +static inline ElfW (Addr) elf_machine_load_address (void)
> +{
> + extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
> + return (ElfW(Addr)) &__ehdr_start;
> +}
> +
> +/* Return the link-time address of _DYNAMIC. */
> +static inline ElfW (Addr) elf_machine_dynamic (void)
> +{
> + extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
> + return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
> +}
> +
> +/* Initial entry point code for the dynamic linker.
> + The C function `_dl_start' is the real entry point;
> + its return value is the user program's entry point. */
> +
> +#define RTLD_START \
> + asm(".text\n\
> + " _RTLD_PROLOGUE (ENTRY_POINT) "\
> + .cfi_label .Ldummy \n\
> + " CFI_UNDEFINED (1) " \n\
> + or $a0, $sp, $zero \n\
> + bl _dl_start \n\
> + # Stash user entry point in s0. \n\
> + or $s0, $v0, $zero \n\
> + # Load the original argument count. \n\
> + ld.d $a1, $sp, 0 \n\
> + # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
> + char **env) \n\
> + la $a0, _rtld_local \n\
> + ld.d $a0, $a0, 0 \n\
> + addi.d $a2, $sp, 8 \n\
> + slli.d $a3, $a1, 3 \n\
> + add.d $a3, $a3, $a2 \n\
> + addi.d $a3, $a3, 8 \n\
>
>
> The _dl_init seems much more complex than the riscv counterpart.
>
> + # Adjust $sp for 16-aligned \n\
> + srli.d $t0, $sp, 4 \n\
> + slli.d $t0, $t0, 4 \n\
> + ori $t1, $sp, 0 \n\
> + addi.d $sp, $t0, -32 \n\
> + st.d $t1, $sp, 24 \n\
>
>
> Seems too complex.
>
> + # Call the function to run the initializers. \n\
> + bl _dl_init \n\
> + # Pass our finalizer function to _start. \n\
> + ld.d $sp, $sp, 24 \n\
> + la $a0, _dl_fini \n\
> + # Jump to the user entry point. \n\
> + jirl $zero, $s0, 0 \n\
> + " _RTLD_EPILOGUE (ENTRY_POINT) "\
> + .previous");
> +
> +/* Names of the architecture-specific auditing callback functions. */
> +#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
> +#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
> +
> +/* Bias .got.plt entry by the offset requested by the PLT header. */
> +#define elf_machine_plt_value(map, reloc, value) (value)
> +
> +static inline ElfW (Addr)
> +elf_machine_fixup_plt (struct link_map *map, lookup_t t,
> + const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
> + const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
> + ElfW (Addr) value)
> +{
> + return *reloc_addr = value;
> +}
> +
> +#endif /* !dl_machine_h */
> +
> +#ifdef RESOLVE_MAP
> +
> +/* Perform a relocation described by R_INFO at the location pointed to
> + by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
> + MAP is the object containing the reloc. */
> +
> +static inline void __attribute__ ((always_inline))
> +elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
> + const ElfW (Rela) * reloc,
> + const ElfW (Sym) * sym,
>
>
> Seems excess space after `*`
>
> + const struct r_found_version *version,
> + void *const reloc_addr, int skip_ifunc)
> +{
> + ElfW (Addr) r_info = reloc->r_info;
> + const unsigned long int r_type = ELFW (R_TYPE) (r_info);
> + ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
> + const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
> + struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type);
> + ElfW (Addr) value = 0;
> + if (sym_map != NULL)
> + value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
> +
> + if (sym != NULL
> + && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
> + && __glibc_likely (sym->st_shndx != SHN_UNDEF)
> + && __glibc_likely (!skip_ifunc))
> + value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
> +
> + switch (r_type)
> + {
> +#ifndef RTLD_BOOTSTRAP
> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
> + R_LARCH_TLS_DTPMOD32:
> + if (sym_map)
> + *addr_field = sym_map->l_tls_modid;
> + break;
>
>
> I know many ports do `if (sym_map)` but that seems (a) a workaround for possibly
> GNU ld bugs or (b) unneeded cargo cult.
>
> The check should better be removed.
>
> This applies to various TLS dynamic relocations below.
>
> +
> + case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
> + R_LARCH_TLS_DTPREL32:
> + if (sym != NULL)
> + *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
> + break;
> +
> + case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
> + R_LARCH_TLS_TPREL32:
> + if (sym != NULL)
> + {
> + CHECK_STATIC_TLS (map, sym_map);
> + *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
> + }
> + break;
> +
> + case R_LARCH_COPY:
> + {
> + if (sym == NULL)
> + /* This can happen in trace mode if an object could not be
> + found. */
> + break;
> + if (__glibc_unlikely (sym->st_size > refsym->st_size)
> + || (__glibc_unlikely (sym->st_size < refsym->st_size)
> + && GLRO(dl_verbose)))
> + {
> + const char *strtab;
> +
> + strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
> + _dl_error_printf ("\
> +%s: Symbol `%s' has different size in shared object, consider re-linking\n",
> + rtld_progname ?: "<program name unknown>",
> + strtab + refsym->st_name);
> + }
> + memcpy (reloc_addr, (void *) value,
> + MIN (sym->st_size, refsym->st_size));
> + break;
> + }
> +#endif
> +
> +#if !defined RTLD_BOOTSTRAP
> + case R_LARCH_RELATIVE:
> + *addr_field = map->l_addr + reloc->r_addend;
> + break;
> +#endif
>
>
> I think this is copied from riscv but its relocation code is probably
> not the best reference. sysdeps/m68k/dl-machine.h may be one of the
> better implementations for the relocation switch table.
>
> In RTLD_BOOTSTRAP mode, only two relocations (GLOB_DAT/JMP_SLOT) are
> needed in this function. There should be none of NONE, RELATIVE,
> IRELATIVE, absolute relocation types, etc (RELATIVE is handled
> elsewhere).
>
> GNU ld, in the presence of a bug, may produce spurious NONE relocations.
> Not handling NONE can catch some bugs.
>
> + case R_LARCH_JUMP_SLOT:
> + case __WORDSIZE == 64 ? R_LARCH_64:
> + R_LARCH_32:
> + *addr_field = value;
> + break;
> +
> + case R_LARCH_IRELATIVE:
> + value = map->l_addr + reloc->r_addend;
> + if (__glibc_likely (!skip_ifunc))
> + value = ((ElfW (Addr) (*) (void)) value) ();
> + *addr_field = value;
> + break;
> +
> + case R_LARCH_NONE:
> + break;
> +
> + default:
> + _dl_reloc_bad_type (map, r_type, 0);
> + break;
> + }
> +}
> +
> +static inline void __attribute__ ((always_inline))
> +elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) * reloc,
> + void *const reloc_addr)
> +{
> + *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
> +}
> +
> +static inline void __attribute__ ((always_inline))
> +elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
> + ElfW (Addr) l_addr,
> + const ElfW (Rela) * reloc, int skip_ifunc)
> +{
> + ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
> + const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
> +
> + /* Check for unexpected PLT reloc type. */
> + if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
> + {
> + if (__glibc_unlikely (map->l_mach.plt == 0))
> + {
> + if (l_addr)
> + *reloc_addr += l_addr;
> + }
> + else
> + *reloc_addr = map->l_mach.plt;
> + }
> + else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
>
>
> This is a design issue of ifunc for many ports.
> Ideally R_*_IRELATIVE relocations are only in .rela.dyn, not in
> .rela.plt, then you can remove this branch.
>
> + {
> + ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
> + if (__glibc_likely (!skip_ifunc))
> + value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
> + *reloc_addr = (ElfW (Addr)) value;
> + }
> + else
> + _dl_reloc_bad_type (map, r_type, 1);
> +}
> +
> +/* Set up the loaded object described by L so its stub function
> + will jump to the on-demand fixup code __dl_runtime_resolve. */
> +
> +static inline int __attribute__ ((always_inline))
> +elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
> + int lazy, int profile)
> +{
> +#ifndef RTLD_BOOTSTRAP
> + /* If using PLTs, fill in the first two entries of .got.plt. */
> + if (l->l_info[DT_JMPREL])
> + {
> + extern void _dl_runtime_resolve (void)
> + __attribute__ ((visibility ("hidden")));
> + ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
> + gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
> + gotplt[1] = (ElfW (Addr)) l;
> + }
> +#endif
> +
> + return lazy;
> +}
> +
> +#endif /* RESOLVE_MAP */
> diff --git a/sysdeps/loongarch/dl-trampoline.S b/sysdeps/loongarch/dl-trampoline.S
> new file mode 100644
> index 0000000000..eb610392f6
> --- /dev/null
> +++ b/sysdeps/loongarch/dl-trampoline.S
> @@ -0,0 +1,91 @@
> +/* PLT trampolines.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +#include <sys/asm.h>
> +
> +/* Assembler veneer called from the PLT header code for lazy loading.
> + The PLT header passes its own args in t0-t2. */
> +
> +#ifdef __loongarch_soft_float
> +# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
> +#else
> +# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
> +#endif
> +
> +ENTRY (_dl_runtime_resolve)
> +
> + /* Save arguments to stack. */
> + ADDI sp, sp, -FRAME_SIZE
> +
> + REG_S ra, sp, 9*SZREG
> + REG_S a0, sp, 1*SZREG
> + REG_S a1, sp, 2*SZREG
> + REG_S a2, sp, 3*SZREG
> + REG_S a3, sp, 4*SZREG
> + REG_S a4, sp, 5*SZREG
> + REG_S a5, sp, 6*SZREG
> + REG_S a6, sp, 7*SZREG
> + REG_S a7, sp, 8*SZREG
> +
> +#ifndef __loongarch_soft_float
> + FREG_S fa0, sp, 10*SZREG + 0*SZFREG
> + FREG_S fa1, sp, 10*SZREG + 1*SZFREG
> + FREG_S fa2, sp, 10*SZREG + 2*SZFREG
> + FREG_S fa3, sp, 10*SZREG + 3*SZFREG
> + FREG_S fa4, sp, 10*SZREG + 4*SZFREG
> + FREG_S fa5, sp, 10*SZREG + 5*SZFREG
> + FREG_S fa6, sp, 10*SZREG + 6*SZFREG
> + FREG_S fa7, sp, 10*SZREG + 7*SZFREG
> +#endif
> +
> + /* Update .got.plt and obtain runtime address of callee */
> + SLLI a1, t1, 1
> + or a0, t0, zero
> + ADD a1, a1, t1
> + la a2, _dl_fixup
> + jirl ra, a2, 0
> + or t1, v0, zero
> +
> + /* Restore arguments from stack. */
> + REG_L ra, sp, 9*SZREG
> + REG_L a0, sp, 1*SZREG
> + REG_L a1, sp, 2*SZREG
> + REG_L a2, sp, 3*SZREG
> + REG_L a3, sp, 4*SZREG
> + REG_L a4, sp, 5*SZREG
> + REG_L a5, sp, 6*SZREG
> + REG_L a6, sp, 7*SZREG
> + REG_L a7, sp, 8*SZREG
> +
> +#ifndef __loongarch_soft_float
> + FREG_L fa0, sp, 10*SZREG + 0*SZFREG
> + FREG_L fa1, sp, 10*SZREG + 1*SZFREG
> + FREG_L fa2, sp, 10*SZREG + 2*SZFREG
> + FREG_L fa3, sp, 10*SZREG + 3*SZFREG
> + FREG_L fa4, sp, 10*SZREG + 4*SZFREG
> + FREG_L fa5, sp, 10*SZREG + 5*SZFREG
> + FREG_L fa6, sp, 10*SZREG + 6*SZFREG
> + FREG_L fa7, sp, 10*SZREG + 7*SZFREG
> +#endif
> +
> + ADDI sp, sp, FRAME_SIZE
> +
> + /* Invoke the callee. */
> + jirl zero, t1, 0
> +END (_dl_runtime_resolve)
> diff --git a/sysdeps/loongarch/jmpbuf-offsets.h b/sysdeps/loongarch/jmpbuf-offsets.h
> new file mode 100644
> index 0000000000..a4b8ea690e
> --- /dev/null
> +++ b/sysdeps/loongarch/jmpbuf-offsets.h
> @@ -0,0 +1,22 @@
> +/* Private macros for accessing __jmp_buf contents.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public License as
> + published by the Free Software Foundation; either version 2.1 of the
> + License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <jmpbuf-unwind.h>
> +
> +/* Helper for generic ____longjmp_chk(). */
> +#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
> diff --git a/sysdeps/loongarch/jmpbuf-unwind.h b/sysdeps/loongarch/jmpbuf-unwind.h
> new file mode 100644
> index 0000000000..6fa509151d
> --- /dev/null
> +++ b/sysdeps/loongarch/jmpbuf-unwind.h
> @@ -0,0 +1,45 @@
> +/* Examine __jmp_buf for unwinding frames.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <setjmp.h>
> +#include <stdint.h>
> +#include <unwind.h>
> +#include <sysdep.h>
> +
> +/* Test if longjmp to JMPBUF would unwind the frame
> + containing a local variable at ADDRESS. */
> +#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
> + ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
> +
> +#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
> + _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
> +
> +static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp (__jmp_buf regs)
> +{
> + uintptr_t sp = regs[0].__sp;
> +#ifdef PTR_DEMANGLE
> + PTR_DEMANGLE (sp);
> +#endif
> + return sp;
> +}
> +
> +#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
> + ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
> +
> +/* We use the normal longjmp for unwinding. */
> +#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
> diff --git a/sysdeps/loongarch/ldsodefs.h b/sysdeps/loongarch/ldsodefs.h
> new file mode 100644
> index 0000000000..36b1b25b9f
> --- /dev/null
> +++ b/sysdeps/loongarch/ldsodefs.h
> @@ -0,0 +1,41 @@
> +/* Run-time dynamic linker data structures for loaded ELF shared objects.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _LOONGARCH_LDSODEFS_H
> +#define _LOONGARCH_LDSODEFS_H 1
> +
> +#include <elf.h>
> +
> +struct La_loongarch_regs;
> +struct La_loongarch_retval;
> +
> +#define ARCH_PLTENTER_MEMBERS \
> + ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
> + uintptr_t *, uintptr_t *, \
> + const struct La_loongarch_regs *, \
> + unsigned int *, const char *name, \
> + long int *framesizep);
> +
> +#define ARCH_PLTEXIT_MEMBERS \
> + unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
> + uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
> + struct La_loongarch_retval *, const char *);
> +
> +#include_next <ldsodefs.h>
> +
> +#endif
> diff --git a/sysdeps/loongarch/linkmap.h b/sysdeps/loongarch/linkmap.h
> new file mode 100644
> index 0000000000..bbba73ed70
> --- /dev/null
> +++ b/sysdeps/loongarch/linkmap.h
> @@ -0,0 +1,22 @@
> +/* Definition of link_map_machine.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +struct link_map_machine
> +{
> + ElfW (Addr) plt; /* Address of .plt. */
> +};
> diff --git a/sysdeps/loongarch/machine-gmon.h b/sysdeps/loongarch/machine-gmon.h
> new file mode 100644
> index 0000000000..4a3cdd964e
> --- /dev/null
> +++ b/sysdeps/loongarch/machine-gmon.h
> @@ -0,0 +1,37 @@
> +/* LoongArch definitions for profiling support.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library; if not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +/* Accept 'frompc' address as argument from the function that calls
> + _mcount for profiling. Use __builtin_return_address (0)
> + for the 'selfpc' address. */
> +
> +#include <sysdep.h>
> +
> +static void mcount_internal (unsigned long int frompc,
> + unsigned long int selfpc);
> +
> +#define _MCOUNT_DECL(frompc, selfpc) \
> + static inline void mcount_internal (unsigned long int frompc, \
> + unsigned long int selfpc)
> +
> +#define MCOUNT \
> + void _mcount (void *frompc) \
> + { \
> + mcount_internal ((unsigned long int) frompc, \
> + (unsigned long int) RETURN_ADDRESS (0)); \
> + }
> diff --git a/sysdeps/loongarch/setjmp.S b/sysdeps/loongarch/setjmp.S
> new file mode 100644
> index 0000000000..b93ae2f5da
> --- /dev/null
> +++ b/sysdeps/loongarch/setjmp.S
> @@ -0,0 +1,66 @@
> +/* setjmp for LoongArch.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#include <sysdep.h>
> +#include <sys/asm.h>
> +
> +ENTRY (_setjmp)
> + li.w a1,0
> + b __sigsetjmp
> +END (_setjmp)
> +
> +ENTRY (setjmp)
> + li.w a1,1
> +END (setjmp)
> +
> +ENTRY (__sigsetjmp)
> + REG_S ra, a0, 0*SZREG
> + REG_S sp, a0, 1*SZREG
> + REG_S x, a0, 2*SZREG
> + REG_S fp, a0, 3*SZREG
> + REG_S s0, a0, 4*SZREG
> + REG_S s1, a0, 5*SZREG
> + REG_S s2, a0, 6*SZREG
> + REG_S s3, a0, 7*SZREG
> + REG_S s4, a0, 8*SZREG
> + REG_S s5, a0, 9*SZREG
> + REG_S s6, a0, 10*SZREG
> + REG_S s7, a0, 11*SZREG
> + REG_S s8, a0, 12*SZREG
> +
> +#ifndef __loongarch_soft_float
> + FREG_S $f24, a0, 13*SZREG + 0*SZFREG
> + FREG_S $f25, a0, 13*SZREG + 1*SZFREG
> + FREG_S $f26, a0, 13*SZREG + 2*SZFREG
> + FREG_S $f27, a0, 13*SZREG + 3*SZFREG
> + FREG_S $f28, a0, 13*SZREG + 4*SZFREG
> + FREG_S $f29, a0, 13*SZREG + 5*SZFREG
> + FREG_S $f30, a0, 13*SZREG + 6*SZFREG
> + FREG_S $f31, a0, 13*SZREG + 7*SZFREG
> +#endif
> +
> +#if !IS_IN (libc) && IS_IN(rtld)
> + li.w v0, 0
> + jirl zero,ra,0
> +#else
> + b __sigjmp_save
> +#endif
> +END (__sigsetjmp)
> +
> +hidden_def (__sigsetjmp)
> +weak_alias (_setjmp, __GI__setjmp)
> diff --git a/sysdeps/loongarch/sotruss-lib.c b/sysdeps/loongarch/sotruss-lib.c
> new file mode 100644
> index 0000000000..5b15f4815a
> --- /dev/null
> +++ b/sysdeps/loongarch/sotruss-lib.c
> @@ -0,0 +1,50 @@
> +/* Override generic sotruss-lib.c to define actual functions for LoongArch.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define HAVE_ARCH_PLTENTER
> +#define HAVE_ARCH_PLTEXIT
> +
> +#include <elf/sotruss-lib.c>
> +
> +ElfW (Addr)
> +la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
> + unsigned int ndx __attribute__ ((unused)),
> + uintptr_t *refcook, uintptr_t *defcook,
> + La_loongarch_regs *regs, unsigned int *flags,
> + const char *symname, long int *framesizep)
> +{
> + print_enter (refcook, defcook, symname, regs->lr_reg[0], regs->lr_reg[1],
> + regs->lr_reg[2], *flags);
> +
> + /* No need to copy anything, we will not need the parameters in any case. */
> + *framesizep = 0;
> +
> + return sym->st_value;
> +}
> +
> +unsigned int
> +la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
> + uintptr_t *refcook, uintptr_t *defcook,
> + const struct La_loongarch_regs *inregs,
> + struct La_loongarch_retval *outregs,
> + const char *symname)
> +{
> + print_exit (refcook, defcook, symname, outregs->lrv_a0);
> +
> + return 0;
> +}
> diff --git a/sysdeps/loongarch/start.S b/sysdeps/loongarch/start.S
> new file mode 100644
> index 0000000000..a9b32aa966
> --- /dev/null
> +++ b/sysdeps/loongarch/start.S
> @@ -0,0 +1,67 @@
> +/* Startup code compliant to the ELF LoongArch ABI.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define __ASSEMBLY__ 1
> +#include <entry.h>
> +#include <sys/asm.h>
> +
> +/* The entry point's job is to call __libc_start_main. Per the ABI,
> + a0 contains the address of a function to be passed to atexit.
> + __libc_start_main wants this in a5. */
> +
> +/*
> +int
> +__libc_start_main (int (*main) (int, char **, char **),
> + int argc,
> + char **argv,
> + __typeof (main) init,
> + void (*fini) (void),
> + void (*rtld_fini) (void),
> + void *stack_end);
> + */
> +
> +ENTRY (ENTRY_POINT)
> +
> +/* Terminate call stack by noting ra is undefined. Use a dummy
> + .cfi_label to force starting the FDE. */
> + .cfi_label .Ldummy
> + cfi_undefined (1)
> + or a5, a0, zero /* rtld_fini */
> +
> +/* We must get symbol main through GOT table, since main may not be local.
> + For instance: googletest defines main in dynamic library. */
> + la.got a0, t0, main
> + REG_L a1, sp, 0
> + ADDI a2, sp, SZREG
> +
> + /* Adjust $sp for 16-aligned */
> + SRLI sp, sp, 4
> + SLLI sp, sp, 4
> +
> + move a3, zero /* used to be init */
> + move a4, zero /* used to be fini */
> + or a6, sp, zero /* stack_end */
> +
> + la.got ra, t0, __libc_start_main
> + jirl ra, ra, 0
> +
> + la.got ra, t0, abort
> + jirl ra, ra, 0
> +END (ENTRY_POINT)
> +
> diff --git a/sysdeps/loongarch/sys/asm.h b/sysdeps/loongarch/sys/asm.h
> new file mode 100644
> index 0000000000..b41ee59694
> --- /dev/null
> +++ b/sysdeps/loongarch/sys/asm.h
> @@ -0,0 +1,59 @@
> +/* Miscellaneous macros.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#ifndef _SYS_ASM_H
> +#define _SYS_ASM_H
> +
> +#include <sys/regdef.h>
> +#include <sysdeps/generic/sysdep.h>
> +
> +/* Macros to handle different pointer/register sizes for 32/64-bit code. */
> +#define SZREG 8
> +#define SZFREG 8
> +#define REG_L ld.d
> +#define REG_S st.d
> +#define SRLI srli.d
> +#define SLLI slli.d
> +#define ADDI addi.d
> +#define ADD add.d
> +#define BSTRINS bstrins.d
> +#define LI li.d
> +#define FREG_L fld.d
> +#define FREG_S fst.d
> +
> +/* Declare leaf routine. */
> +#define LEAF(symbol) \
> + .text; \
> + .globl symbol; \
> + .align 3; \
> + cfi_startproc; \
> + .type symbol, @function; \
> + symbol:
> +
> +#define ENTRY(symbol) LEAF (symbol)
> +
> +/* Mark end of function. */
> +#undef END
> +#define END(function) \
> + cfi_endproc; \
> + .size function, .- function;
> +
> +/* Stack alignment. */
> +#define ALMASK ~15
> +
> +#endif /* sys/asm.h */
> diff --git a/sysdeps/loongarch/tst-audit.h b/sysdeps/loongarch/tst-audit.h
> new file mode 100644
> index 0000000000..e71948c86e
> --- /dev/null
> +++ b/sysdeps/loongarch/tst-audit.h
> @@ -0,0 +1,23 @@
> +/* Definitions for testing PLT entry/exit auditing.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <https://www.gnu.org/licenses/>. */
> +
> +#define pltenter la_loongarch_gnu_pltenter
> +#define pltexit la_loongarch_gnu_pltexit
> +#define La_regs La_loongarch_regs
> +#define La_retval La_loongarch_retval
> +#define int_retval lrv_a0
> diff --git a/sysdeps/unix/sysv/linux/loongarch/ldconfig.h b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
> new file mode 100644
> index 0000000000..4887c30ca2
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/loongarch/ldconfig.h
> @@ -0,0 +1,26 @@
> +/* ldconfig default paths and libraries.
> + Copyright (C) 2022 Free Software Foundation, Inc.
> + This file is part of the GNU C Library.
> +
> + The GNU C Library is free software; you can redistribute it and/or
> + modify it under the terms of the GNU Lesser General Public
> + License as published by the Free Software Foundation; either
> + version 2.1 of the License, or (at your option) any later version.
> +
> + The GNU C Library is distributed in the hope that it will be useful,
> + but WITHOUT ANY WARRANTY; without even the implied warranty of
> + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
> + Lesser General Public License for more details.
> +
> + You should have received a copy of the GNU Lesser General Public
> + License along with the GNU C Library. If not, see
> + <http://www.gnu.org/licenses/>. */
> +
> +#include <sysdeps/generic/ldconfig.h>
> +
> +#define SYSDEP_KNOWN_INTERPRETER_NAMES \
> + { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
> +
> +#define SYSDEP_KNOWN_LIBRARY_NAMES \
> + { "libc.so.6", FLAG_ELF_LIBC6 }, \
> + { "libm.so.6", FLAG_ELF_LIBC6 },
> --
> 2.31.1
>
new file mode 100644
@@ -0,0 +1,52 @@
+/* longjmp.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+
+ENTRY (__longjmp)
+ REG_L ra, a0, 0*SZREG
+ REG_L sp, a0, 1*SZREG
+ REG_L x, a0, 2*SZREG
+ REG_L fp, a0, 3*SZREG
+ REG_L s0, a0, 4*SZREG
+ REG_L s1, a0, 5*SZREG
+ REG_L s2, a0, 6*SZREG
+ REG_L s3, a0, 7*SZREG
+ REG_L s4, a0, 8*SZREG
+ REG_L s5, a0, 9*SZREG
+ REG_L s6, a0, 10*SZREG
+ REG_L s7, a0, 11*SZREG
+ REG_L s8, a0, 12*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_L $f24, a0, 13*SZREG + 0*SZFREG
+ FREG_L $f25, a0, 13*SZREG + 1*SZFREG
+ FREG_L $f26, a0, 13*SZREG + 2*SZFREG
+ FREG_L $f27, a0, 13*SZREG + 3*SZFREG
+ FREG_L $f28, a0, 13*SZREG + 4*SZFREG
+ FREG_L $f29, a0, 13*SZREG + 5*SZFREG
+ FREG_L $f30, a0, 13*SZREG + 6*SZFREG
+ FREG_L $f31, a0, 13*SZREG + 7*SZFREG
+#endif
+
+ sltui a0,a1,1
+ ADD a0, a0, a1 # a0 = (a1 == 0) ? 1 : a1
+ jirl zero,ra,0
+
+END (__longjmp)
new file mode 100644
@@ -0,0 +1,11 @@
+#ifndef _BITS_ENDIANNESS_H
+#define _BITS_ENDIANNESS_H 1
+
+#ifndef _BITS_ENDIAN_H
+#error "Never use <bits/endianness.h> directly; include <endian.h> instead."
+#endif
+
+/* LoongArch is little-endian. */
+#define __BYTE_ORDER __LITTLE_ENDIAN
+
+#endif /* bits/endianness.h */
new file mode 100644
@@ -0,0 +1,58 @@
+/* Machine-specific declarations for dynamic linker interface.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LINK_H
+#error "Never include <bits/link.h> directly; use <link.h> instead."
+#endif
+
+typedef struct La_loongarch_regs
+{
+ unsigned long int lr_reg[8]; /* a0 - a7 */
+ double lr_fpreg[8]; /* fa0 - fa7 */
+ unsigned long int lr_ra;
+ unsigned long int lr_sp;
+} La_loongarch_regs;
+
+/* Return values for calls from PLT on LoongArch. */
+typedef struct La_loongarch_retval
+{
+ unsigned long int lrv_a0;
+ unsigned long int lrv_a1;
+ double lrv_fa0;
+ double lrv_fa1;
+} La_loongarch_retval;
+
+__BEGIN_DECLS
+
+extern ElfW (Addr) la_loongarch_gnu_pltenter (ElfW (Sym) * __sym,
+ unsigned int __ndx,
+ uintptr_t *__refcook,
+ uintptr_t *__defcook,
+ La_loongarch_regs *__regs,
+ unsigned int *__flags,
+ const char *__symname,
+ long int *__framesizep);
+extern unsigned int la_loongarch_gnu_pltexit (ElfW (Sym) * __sym,
+ unsigned int __ndx,
+ uintptr_t *__refcook,
+ uintptr_t *__defcook,
+ const La_loongarch_regs *__inregs,
+ La_loongarch_retval *__outregs,
+ const char *__symname);
+
+__END_DECLS
new file mode 100644
@@ -0,0 +1,42 @@
+/* Define the machine-dependent type `jmp_buf'.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LOONGARCH_BITS_SETJMP_H
+#define _LOONGARCH_BITS_SETJMP_H
+
+typedef struct __jmp_buf_internal_tag
+{
+ /* Program counter. */
+ long int __pc;
+ /* Stack pointer. */
+ long int __sp;
+ /* Reserved */
+ long int __x;
+ /* Frame pointer. */
+ long int __fp;
+ /* Callee-saved registers. */
+ long int __regs[9];
+
+#ifndef __loongarch_soft_float
+ /* Callee-saved floating point registers. */
+ double __fpregs[8];
+#endif
+
+} __jmp_buf[1];
+
+#endif /* _LOONGARCH_BITS_SETJMP_H */
new file mode 100644
@@ -0,0 +1 @@
+/* _setjmp is implemented in setjmp.S. */
new file mode 100644
@@ -0,0 +1 @@
+/* setjmp is implemented in setjmp.S. */
new file mode 100644
@@ -0,0 +1,307 @@
+/* Machine-dependent ELF dynamic relocation inline functions.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef dl_machine_h
+#define dl_machine_h
+
+#define ELF_MACHINE_NAME "LoongArch"
+
+#include <entry.h>
+#include <elf/elf.h>
+#include <sys/asm.h>
+#include <dl-tls.h>
+#include <dl-static-tls.h>
+#include <dl-machine-rel.h>
+
+#ifndef _RTLD_PROLOGUE
+# define _RTLD_PROLOGUE(entry) \
+ ".globl\t" __STRING (entry) "\n\t" \
+ ".type\t" __STRING (entry) ", @function\n\t" \
+ CFI_STARTPROC "\n" \
+ __STRING (entry) ":\n"
+#endif
+
+#ifndef _RTLD_EPILOGUE
+# define _RTLD_EPILOGUE(entry) \
+ CFI_ENDPROC "\n\t" \
+ ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n"
+#endif
+
+#define ELF_MACHINE_JMP_SLOT R_LARCH_JUMP_SLOT
+#define ELF_MACHINE_IRELATIVE R_LARCH_IRELATIVE
+
+#define elf_machine_type_class(type) \
+ ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPREL32) \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_DTPMOD32) \
+ || (__WORDSIZE == 32 && (type) == R_LARCH_TLS_TPREL32) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPREL64) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_DTPMOD64) \
+ || (__WORDSIZE == 64 && (type) == R_LARCH_TLS_TPREL64))) \
+ | (ELF_RTYPE_CLASS_COPY * ((type) == R_LARCH_COPY)))
+
+#define ELF_MACHINE_NO_REL 1
+#define ELF_MACHINE_NO_RELA 0
+
+/* Return nonzero iff ELF header is compatible with the running host. */
+static inline int
+elf_machine_matches_host (const ElfW (Ehdr) * ehdr)
+{
+ /* We can only run LoongArch binaries. */
+ if (ehdr->e_machine != EM_LOONGARCH)
+ return 0;
+
+ return 1;
+}
+
+/* Return the run-time load address of the shared object. */
+static inline ElfW (Addr) elf_machine_load_address (void)
+{
+ extern const ElfW(Ehdr) __ehdr_start attribute_hidden;
+ return (ElfW(Addr)) &__ehdr_start;
+}
+
+/* Return the link-time address of _DYNAMIC. */
+static inline ElfW (Addr) elf_machine_dynamic (void)
+{
+ extern ElfW(Dyn) _DYNAMIC[] attribute_hidden;
+ return (ElfW(Addr)) _DYNAMIC - elf_machine_load_address ();
+}
+
+/* Initial entry point code for the dynamic linker.
+ The C function `_dl_start' is the real entry point;
+ its return value is the user program's entry point. */
+
+#define RTLD_START \
+ asm(".text\n\
+ " _RTLD_PROLOGUE (ENTRY_POINT) "\
+ .cfi_label .Ldummy \n\
+ " CFI_UNDEFINED (1) " \n\
+ or $a0, $sp, $zero \n\
+ bl _dl_start \n\
+ # Stash user entry point in s0. \n\
+ or $s0, $v0, $zero \n\
+ # Load the original argument count. \n\
+ ld.d $a1, $sp, 0 \n\
+ # Call _dl_init (struct link_map *main_map, int argc, char **argv, \
+ char **env) \n\
+ la $a0, _rtld_local \n\
+ ld.d $a0, $a0, 0 \n\
+ addi.d $a2, $sp, 8 \n\
+ slli.d $a3, $a1, 3 \n\
+ add.d $a3, $a3, $a2 \n\
+ addi.d $a3, $a3, 8 \n\
+ # Adjust $sp for 16-aligned \n\
+ srli.d $t0, $sp, 4 \n\
+ slli.d $t0, $t0, 4 \n\
+ ori $t1, $sp, 0 \n\
+ addi.d $sp, $t0, -32 \n\
+ st.d $t1, $sp, 24 \n\
+ # Call the function to run the initializers. \n\
+ bl _dl_init \n\
+ # Pass our finalizer function to _start. \n\
+ ld.d $sp, $sp, 24 \n\
+ la $a0, _dl_fini \n\
+ # Jump to the user entry point. \n\
+ jirl $zero, $s0, 0 \n\
+ " _RTLD_EPILOGUE (ENTRY_POINT) "\
+ .previous");
+
+/* Names of the architecture-specific auditing callback functions. */
+#define ARCH_LA_PLTENTER loongarch_gnu_pltenter
+#define ARCH_LA_PLTEXIT loongarch_gnu_pltexit
+
+/* Bias .got.plt entry by the offset requested by the PLT header. */
+#define elf_machine_plt_value(map, reloc, value) (value)
+
+static inline ElfW (Addr)
+elf_machine_fixup_plt (struct link_map *map, lookup_t t,
+ const ElfW (Sym) * refsym, const ElfW (Sym) * sym,
+ const ElfW (Rela) * reloc, ElfW (Addr) * reloc_addr,
+ ElfW (Addr) value)
+{
+ return *reloc_addr = value;
+}
+
+#endif /* !dl_machine_h */
+
+#ifdef RESOLVE_MAP
+
+/* Perform a relocation described by R_INFO at the location pointed to
+ by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
+ MAP is the object containing the reloc. */
+
+static inline void __attribute__ ((always_inline))
+elf_machine_rela (struct link_map *map, struct r_scope_elem *scope[],
+ const ElfW (Rela) * reloc,
+ const ElfW (Sym) * sym,
+ const struct r_found_version *version,
+ void *const reloc_addr, int skip_ifunc)
+{
+ ElfW (Addr) r_info = reloc->r_info;
+ const unsigned long int r_type = ELFW (R_TYPE) (r_info);
+ ElfW (Addr) *addr_field = (ElfW (Addr) *) reloc_addr;
+ const ElfW (Sym) *const __attribute__ ((unused)) refsym = sym;
+ struct link_map *sym_map = RESOLVE_MAP (map, scope, &sym, version, r_type);
+ ElfW (Addr) value = 0;
+ if (sym_map != NULL)
+ value = SYMBOL_ADDRESS (sym_map, sym, true) + reloc->r_addend;
+
+ if (sym != NULL
+ && __glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_GNU_IFUNC)
+ && __glibc_likely (sym->st_shndx != SHN_UNDEF)
+ && __glibc_likely (!skip_ifunc))
+ value = ((ElfW (Addr) (*) (int)) value) (GLRO (dl_hwcap));
+
+ switch (r_type)
+ {
+#ifndef RTLD_BOOTSTRAP
+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPMOD64:
+ R_LARCH_TLS_DTPMOD32:
+ if (sym_map)
+ *addr_field = sym_map->l_tls_modid;
+ break;
+
+ case __WORDSIZE == 64 ? R_LARCH_TLS_DTPREL64:
+ R_LARCH_TLS_DTPREL32:
+ if (sym != NULL)
+ *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend;
+ break;
+
+ case __WORDSIZE == 64 ? R_LARCH_TLS_TPREL64:
+ R_LARCH_TLS_TPREL32:
+ if (sym != NULL)
+ {
+ CHECK_STATIC_TLS (map, sym_map);
+ *addr_field = TLS_TPREL_VALUE (sym_map, sym) + reloc->r_addend;
+ }
+ break;
+
+ case R_LARCH_COPY:
+ {
+ if (sym == NULL)
+ /* This can happen in trace mode if an object could not be
+ found. */
+ break;
+ if (__glibc_unlikely (sym->st_size > refsym->st_size)
+ || (__glibc_unlikely (sym->st_size < refsym->st_size)
+ && GLRO(dl_verbose)))
+ {
+ const char *strtab;
+
+ strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
+ _dl_error_printf ("\
+%s: Symbol `%s' has different size in shared object, consider re-linking\n",
+ rtld_progname ?: "<program name unknown>",
+ strtab + refsym->st_name);
+ }
+ memcpy (reloc_addr, (void *) value,
+ MIN (sym->st_size, refsym->st_size));
+ break;
+ }
+#endif
+
+#if !defined RTLD_BOOTSTRAP
+ case R_LARCH_RELATIVE:
+ *addr_field = map->l_addr + reloc->r_addend;
+ break;
+#endif
+
+ case R_LARCH_JUMP_SLOT:
+ case __WORDSIZE == 64 ? R_LARCH_64:
+ R_LARCH_32:
+ *addr_field = value;
+ break;
+
+ case R_LARCH_IRELATIVE:
+ value = map->l_addr + reloc->r_addend;
+ if (__glibc_likely (!skip_ifunc))
+ value = ((ElfW (Addr) (*) (void)) value) ();
+ *addr_field = value;
+ break;
+
+ case R_LARCH_NONE:
+ break;
+
+ default:
+ _dl_reloc_bad_type (map, r_type, 0);
+ break;
+ }
+}
+
+static inline void __attribute__ ((always_inline))
+elf_machine_rela_relative (ElfW (Addr) l_addr, const ElfW (Rela) * reloc,
+ void *const reloc_addr)
+{
+ *(ElfW (Addr) *) reloc_addr = l_addr + reloc->r_addend;
+}
+
+static inline void __attribute__ ((always_inline))
+elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
+ ElfW (Addr) l_addr,
+ const ElfW (Rela) * reloc, int skip_ifunc)
+{
+ ElfW (Addr) *const reloc_addr = (void *) (l_addr + reloc->r_offset);
+ const unsigned int r_type = ELFW (R_TYPE) (reloc->r_info);
+
+ /* Check for unexpected PLT reloc type. */
+ if (__glibc_likely (r_type == R_LARCH_JUMP_SLOT))
+ {
+ if (__glibc_unlikely (map->l_mach.plt == 0))
+ {
+ if (l_addr)
+ *reloc_addr += l_addr;
+ }
+ else
+ *reloc_addr = map->l_mach.plt;
+ }
+ else if (__glibc_unlikely (r_type == R_LARCH_IRELATIVE))
+ {
+ ElfW (Addr) *value = (void *) (l_addr + reloc->r_addend);
+ if (__glibc_likely (!skip_ifunc))
+ value = (ElfW (Addr) *) ((ElfW (Addr) (*) (void)) value) ();
+ *reloc_addr = (ElfW (Addr)) value;
+ }
+ else
+ _dl_reloc_bad_type (map, r_type, 1);
+}
+
+/* Set up the loaded object described by L so its stub function
+ will jump to the on-demand fixup code __dl_runtime_resolve. */
+
+static inline int __attribute__ ((always_inline))
+elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[],
+ int lazy, int profile)
+{
+#ifndef RTLD_BOOTSTRAP
+ /* If using PLTs, fill in the first two entries of .got.plt. */
+ if (l->l_info[DT_JMPREL])
+ {
+ extern void _dl_runtime_resolve (void)
+ __attribute__ ((visibility ("hidden")));
+ ElfW (Addr) *gotplt = (ElfW (Addr) *) D_PTR (l, l_info[DT_PLTGOT]);
+ gotplt[0] = (ElfW (Addr)) & _dl_runtime_resolve;
+ gotplt[1] = (ElfW (Addr)) l;
+ }
+#endif
+
+ return lazy;
+}
+
+#endif /* RESOLVE_MAP */
new file mode 100644
@@ -0,0 +1,91 @@
+/* PLT trampolines.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+
+/* Assembler veneer called from the PLT header code for lazy loading.
+ The PLT header passes its own args in t0-t2. */
+
+#ifdef __loongarch_soft_float
+# define FRAME_SIZE (-((-10 * SZREG) & ALMASK))
+#else
+# define FRAME_SIZE (-((-10 * SZREG - 8 * SZFREG) & ALMASK))
+#endif
+
+ENTRY (_dl_runtime_resolve)
+
+ /* Save arguments to stack. */
+ ADDI sp, sp, -FRAME_SIZE
+
+ REG_S ra, sp, 9*SZREG
+ REG_S a0, sp, 1*SZREG
+ REG_S a1, sp, 2*SZREG
+ REG_S a2, sp, 3*SZREG
+ REG_S a3, sp, 4*SZREG
+ REG_S a4, sp, 5*SZREG
+ REG_S a5, sp, 6*SZREG
+ REG_S a6, sp, 7*SZREG
+ REG_S a7, sp, 8*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_S fa0, sp, 10*SZREG + 0*SZFREG
+ FREG_S fa1, sp, 10*SZREG + 1*SZFREG
+ FREG_S fa2, sp, 10*SZREG + 2*SZFREG
+ FREG_S fa3, sp, 10*SZREG + 3*SZFREG
+ FREG_S fa4, sp, 10*SZREG + 4*SZFREG
+ FREG_S fa5, sp, 10*SZREG + 5*SZFREG
+ FREG_S fa6, sp, 10*SZREG + 6*SZFREG
+ FREG_S fa7, sp, 10*SZREG + 7*SZFREG
+#endif
+
+ /* Update .got.plt and obtain runtime address of callee */
+ SLLI a1, t1, 1
+ or a0, t0, zero
+ ADD a1, a1, t1
+ la a2, _dl_fixup
+ jirl ra, a2, 0
+ or t1, v0, zero
+
+ /* Restore arguments from stack. */
+ REG_L ra, sp, 9*SZREG
+ REG_L a0, sp, 1*SZREG
+ REG_L a1, sp, 2*SZREG
+ REG_L a2, sp, 3*SZREG
+ REG_L a3, sp, 4*SZREG
+ REG_L a4, sp, 5*SZREG
+ REG_L a5, sp, 6*SZREG
+ REG_L a6, sp, 7*SZREG
+ REG_L a7, sp, 8*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_L fa0, sp, 10*SZREG + 0*SZFREG
+ FREG_L fa1, sp, 10*SZREG + 1*SZFREG
+ FREG_L fa2, sp, 10*SZREG + 2*SZFREG
+ FREG_L fa3, sp, 10*SZREG + 3*SZFREG
+ FREG_L fa4, sp, 10*SZREG + 4*SZFREG
+ FREG_L fa5, sp, 10*SZREG + 5*SZFREG
+ FREG_L fa6, sp, 10*SZREG + 6*SZFREG
+ FREG_L fa7, sp, 10*SZREG + 7*SZFREG
+#endif
+
+ ADDI sp, sp, FRAME_SIZE
+
+ /* Invoke the callee. */
+ jirl zero, t1, 0
+END (_dl_runtime_resolve)
new file mode 100644
@@ -0,0 +1,22 @@
+/* Private macros for accessing __jmp_buf contents.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public License as
+ published by the Free Software Foundation; either version 2.1 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <jmpbuf-unwind.h>
+
+/* Helper for generic ____longjmp_chk(). */
+#define JB_FRAME_ADDRESS(buf) ((void *) _jmpbuf_sp (buf))
new file mode 100644
@@ -0,0 +1,45 @@
+/* Examine __jmp_buf for unwinding frames.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <setjmp.h>
+#include <stdint.h>
+#include <unwind.h>
+#include <sysdep.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+ containing a local variable at ADDRESS. */
+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
+ ((void *) (address) < (void *) demangle ((jmpbuf)[0].__sp))
+
+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
+ _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
+
+static inline uintptr_t __attribute__ ((unused)) _jmpbuf_sp (__jmp_buf regs)
+{
+ uintptr_t sp = regs[0].__sp;
+#ifdef PTR_DEMANGLE
+ PTR_DEMANGLE (sp);
+#endif
+ return sp;
+}
+
+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
+ ((uintptr_t) (_address) - (_adj) < _jmpbuf_sp (_jmpbuf) - (_adj))
+
+/* We use the normal longjmp for unwinding. */
+#define __libc_unwind_longjmp(buf, val) __libc_longjmp (buf, val)
new file mode 100644
@@ -0,0 +1,41 @@
+/* Run-time dynamic linker data structures for loaded ELF shared objects.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _LOONGARCH_LDSODEFS_H
+#define _LOONGARCH_LDSODEFS_H 1
+
+#include <elf.h>
+
+struct La_loongarch_regs;
+struct La_loongarch_retval;
+
+#define ARCH_PLTENTER_MEMBERS \
+ ElfW (Addr) (*loongarch_gnu_pltenter) (ElfW (Sym) *, unsigned int, \
+ uintptr_t *, uintptr_t *, \
+ const struct La_loongarch_regs *, \
+ unsigned int *, const char *name, \
+ long int *framesizep);
+
+#define ARCH_PLTEXIT_MEMBERS \
+ unsigned int (*loongarch_gnu_pltexit) (ElfW (Sym) *, unsigned int, \
+ uintptr_t *, uintptr_t *, const struct La_loongarch_regs *, \
+ struct La_loongarch_retval *, const char *);
+
+#include_next <ldsodefs.h>
+
+#endif
new file mode 100644
@@ -0,0 +1,22 @@
+/* Definition of link_map_machine.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+struct link_map_machine
+{
+ ElfW (Addr) plt; /* Address of .plt. */
+};
new file mode 100644
@@ -0,0 +1,37 @@
+/* LoongArch definitions for profiling support.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+/* Accept 'frompc' address as argument from the function that calls
+ _mcount for profiling. Use __builtin_return_address (0)
+ for the 'selfpc' address. */
+
+#include <sysdep.h>
+
+static void mcount_internal (unsigned long int frompc,
+ unsigned long int selfpc);
+
+#define _MCOUNT_DECL(frompc, selfpc) \
+ static inline void mcount_internal (unsigned long int frompc, \
+ unsigned long int selfpc)
+
+#define MCOUNT \
+ void _mcount (void *frompc) \
+ { \
+ mcount_internal ((unsigned long int) frompc, \
+ (unsigned long int) RETURN_ADDRESS (0)); \
+ }
new file mode 100644
@@ -0,0 +1,66 @@
+/* setjmp for LoongArch.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <sysdep.h>
+#include <sys/asm.h>
+
+ENTRY (_setjmp)
+ li.w a1,0
+ b __sigsetjmp
+END (_setjmp)
+
+ENTRY (setjmp)
+ li.w a1,1
+END (setjmp)
+
+ENTRY (__sigsetjmp)
+ REG_S ra, a0, 0*SZREG
+ REG_S sp, a0, 1*SZREG
+ REG_S x, a0, 2*SZREG
+ REG_S fp, a0, 3*SZREG
+ REG_S s0, a0, 4*SZREG
+ REG_S s1, a0, 5*SZREG
+ REG_S s2, a0, 6*SZREG
+ REG_S s3, a0, 7*SZREG
+ REG_S s4, a0, 8*SZREG
+ REG_S s5, a0, 9*SZREG
+ REG_S s6, a0, 10*SZREG
+ REG_S s7, a0, 11*SZREG
+ REG_S s8, a0, 12*SZREG
+
+#ifndef __loongarch_soft_float
+ FREG_S $f24, a0, 13*SZREG + 0*SZFREG
+ FREG_S $f25, a0, 13*SZREG + 1*SZFREG
+ FREG_S $f26, a0, 13*SZREG + 2*SZFREG
+ FREG_S $f27, a0, 13*SZREG + 3*SZFREG
+ FREG_S $f28, a0, 13*SZREG + 4*SZFREG
+ FREG_S $f29, a0, 13*SZREG + 5*SZFREG
+ FREG_S $f30, a0, 13*SZREG + 6*SZFREG
+ FREG_S $f31, a0, 13*SZREG + 7*SZFREG
+#endif
+
+#if !IS_IN (libc) && IS_IN(rtld)
+ li.w v0, 0
+ jirl zero,ra,0
+#else
+ b __sigjmp_save
+#endif
+END (__sigsetjmp)
+
+hidden_def (__sigsetjmp)
+weak_alias (_setjmp, __GI__setjmp)
new file mode 100644
@@ -0,0 +1,50 @@
+/* Override generic sotruss-lib.c to define actual functions for LoongArch.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define HAVE_ARCH_PLTENTER
+#define HAVE_ARCH_PLTEXIT
+
+#include <elf/sotruss-lib.c>
+
+ElfW (Addr)
+la_loongarch_gnu_pltenter (ElfW (Sym) * sym __attribute__ ((unused)),
+ unsigned int ndx __attribute__ ((unused)),
+ uintptr_t *refcook, uintptr_t *defcook,
+ La_loongarch_regs *regs, unsigned int *flags,
+ const char *symname, long int *framesizep)
+{
+ print_enter (refcook, defcook, symname, regs->lr_reg[0], regs->lr_reg[1],
+ regs->lr_reg[2], *flags);
+
+ /* No need to copy anything, we will not need the parameters in any case. */
+ *framesizep = 0;
+
+ return sym->st_value;
+}
+
+unsigned int
+la_loongarch_gnu_pltexit (ElfW (Sym) * sym, unsigned int ndx,
+ uintptr_t *refcook, uintptr_t *defcook,
+ const struct La_loongarch_regs *inregs,
+ struct La_loongarch_retval *outregs,
+ const char *symname)
+{
+ print_exit (refcook, defcook, symname, outregs->lrv_a0);
+
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,67 @@
+/* Startup code compliant to the ELF LoongArch ABI.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define __ASSEMBLY__ 1
+#include <entry.h>
+#include <sys/asm.h>
+
+/* The entry point's job is to call __libc_start_main. Per the ABI,
+ a0 contains the address of a function to be passed to atexit.
+ __libc_start_main wants this in a5. */
+
+/*
+int
+__libc_start_main (int (*main) (int, char **, char **),
+ int argc,
+ char **argv,
+ __typeof (main) init,
+ void (*fini) (void),
+ void (*rtld_fini) (void),
+ void *stack_end);
+ */
+
+ENTRY (ENTRY_POINT)
+
+/* Terminate call stack by noting ra is undefined. Use a dummy
+ .cfi_label to force starting the FDE. */
+ .cfi_label .Ldummy
+ cfi_undefined (1)
+ or a5, a0, zero /* rtld_fini */
+
+/* We must get symbol main through GOT table, since main may not be local.
+ For instance: googletest defines main in dynamic library. */
+ la.got a0, t0, main
+ REG_L a1, sp, 0
+ ADDI a2, sp, SZREG
+
+ /* Adjust $sp for 16-aligned */
+ SRLI sp, sp, 4
+ SLLI sp, sp, 4
+
+ move a3, zero /* used to be init */
+ move a4, zero /* used to be fini */
+ or a6, sp, zero /* stack_end */
+
+ la.got ra, t0, __libc_start_main
+ jirl ra, ra, 0
+
+ la.got ra, t0, abort
+ jirl ra, ra, 0
+END (ENTRY_POINT)
+
new file mode 100644
@@ -0,0 +1,59 @@
+/* Miscellaneous macros.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#ifndef _SYS_ASM_H
+#define _SYS_ASM_H
+
+#include <sys/regdef.h>
+#include <sysdeps/generic/sysdep.h>
+
+/* Macros to handle different pointer/register sizes for 32/64-bit code. */
+#define SZREG 8
+#define SZFREG 8
+#define REG_L ld.d
+#define REG_S st.d
+#define SRLI srli.d
+#define SLLI slli.d
+#define ADDI addi.d
+#define ADD add.d
+#define BSTRINS bstrins.d
+#define LI li.d
+#define FREG_L fld.d
+#define FREG_S fst.d
+
+/* Declare leaf routine. */
+#define LEAF(symbol) \
+ .text; \
+ .globl symbol; \
+ .align 3; \
+ cfi_startproc; \
+ .type symbol, @function; \
+ symbol:
+
+#define ENTRY(symbol) LEAF (symbol)
+
+/* Mark end of function. */
+#undef END
+#define END(function) \
+ cfi_endproc; \
+ .size function, .- function;
+
+/* Stack alignment. */
+#define ALMASK ~15
+
+#endif /* sys/asm.h */
new file mode 100644
@@ -0,0 +1,23 @@
+/* Definitions for testing PLT entry/exit auditing.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define pltenter la_loongarch_gnu_pltenter
+#define pltexit la_loongarch_gnu_pltexit
+#define La_regs La_loongarch_regs
+#define La_retval La_loongarch_retval
+#define int_retval lrv_a0
new file mode 100644
@@ -0,0 +1,26 @@
+/* ldconfig default paths and libraries.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library. If not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <sysdeps/generic/ldconfig.h>
+
+#define SYSDEP_KNOWN_INTERPRETER_NAMES \
+ { "/lib64/ld-linux-loongarch-lp64d.so.1", FLAG_ELF_LIBC6 },
+
+#define SYSDEP_KNOWN_LIBRARY_NAMES \
+ { "libc.so.6", FLAG_ELF_LIBC6 }, \
+ { "libm.so.6", FLAG_ELF_LIBC6 },