From patchwork Sat Jan 27 03:57:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Palmer Dabbelt X-Patchwork-Id: 25599 Received: (qmail 105285 invoked by alias); 27 Jan 2018 03:58:14 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 105127 invoked by uid 89); 27 Jan 2018 03:58:13 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-26.1 required=5.0 tests=AWL, BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_PASS autolearn=ham version=3.3.2 spammy= X-HELO: mail-pl0-f41.google.com X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:date:message-id:in-reply-to:references :cc:from:to; bh=aXWW3vM7kGkAVEXKYEBhAuyC1x61dhKr3X6zSaMiasU=; b=Mp+B6bYTj4ktD68ZUSHbQipvlJRMhvfI0QNcNm7WVMJVf6YyTb6rfYBtFcwugWgKc9 obQK824ByDskHh/4FsBS4z9ZusOo1sRRWJmx/lCDSboM3KOzWVWdLMSehbCnvNUJsys+ tk9cFhTSaqW4s6B6y78ePXvyFLfiYObaiUxQwpxLE6CEe7xgyeCWpo7DSZ3eEpS7IaH3 8S0Ig5fKGGPzCU1839OsleIlSXUzJ0UEHXVlaq1f0I2JTl6HYd/u3EOzvK8MZ8zKNlu9 7peZrNq5s5ZQcPwUK/rrqn1KzHqZV9lkDySbPsG2pMU8gOnGHmgiXZJXhcW95vYeVLmI 3nRQ== X-Gm-Message-State: AKwxyteUk/Nhww2kCFlsvhVATU/sVNBQJ2cyQ2/vTl46fH36fcYAAW+M VLJ884fi8l0iWMmQOtu3cSBfDg== X-Google-Smtp-Source: AH8x226H4RZGMWB4k8bcHMMc9D60bFBqVPVfQH44zLze/+3Dw95t0mAshZ39DFJf6aIiy+TDSndGZQ== X-Received: by 2002:a17:902:3064:: with SMTP id u91-v6mr15740342plb.421.1517025485235; Fri, 26 Jan 2018 19:58:05 -0800 (PST) Subject: [PATCH v7 06/17] RISC-V: Startup and Dynamic Loading Code Date: Fri, 26 Jan 2018 19:57:33 -0800 Message-Id: <20180127035744.10058-7-palmer@dabbelt.com> In-Reply-To: <20180127035744.10058-1-palmer@dabbelt.com> References: <20180127035744.10058-1-palmer@dabbelt.com> Cc: Palmer Dabbelt From: Palmer Dabbelt To: libc-alpha@sourceware.org, joseph@codesourcery.com This patch contains the various bits of support used by the C startup code and the dynamic loader when running on a RISC-V system. This contains the implementation of our PLT entries, various ld.so hooks, and _start. This does not contain any Linux-specific code. 2018-01-26 Palmer Dabbelt * sysdeps/riscv/bits/link.h: New file. * sysdeps/riscv/dl-machine.h: Likewise. * sysdeps/riscv/ldsodefs.h: Likewise. * sysdeps/riscv/linkmap.h: Likewise. * sysdeps/riscv/sotruss-lib.c: Likewise. * sysdeps/riscv/start.S: Likewise. * sysdeps/riscv/tst-audit.h: Likewise. --- sysdeps/riscv/bits/link.h | 56 ++++++++ sysdeps/riscv/dl-machine.h | 323 ++++++++++++++++++++++++++++++++++++++++++++ sysdeps/riscv/ldsodefs.h | 47 +++++++ sysdeps/riscv/linkmap.h | 4 + sysdeps/riscv/sotruss-lib.c | 51 +++++++ sysdeps/riscv/start.S | 81 +++++++++++ sysdeps/riscv/tst-audit.h | 23 ++++ 7 files changed, 585 insertions(+) create mode 100644 sysdeps/riscv/bits/link.h create mode 100644 sysdeps/riscv/dl-machine.h create mode 100644 sysdeps/riscv/ldsodefs.h create mode 100644 sysdeps/riscv/linkmap.h create mode 100644 sysdeps/riscv/sotruss-lib.c create mode 100644 sysdeps/riscv/start.S create mode 100644 sysdeps/riscv/tst-audit.h diff --git a/sysdeps/riscv/bits/link.h b/sysdeps/riscv/bits/link.h new file mode 100644 index 000000000000..04c3d7d74b95 --- /dev/null +++ b/sysdeps/riscv/bits/link.h @@ -0,0 +1,56 @@ +/* Machine-specific declarations for dynamic linker interface. RISC-V version. + Copyright (C) 2005-2018 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 + . */ + +#ifndef _LINK_H +# error "Never include directly; use instead." +#endif + +typedef struct La_riscv_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_riscv_regs; + +/* Return values for calls from PLT on RISC-V. */ +typedef struct La_riscv_retval +{ + unsigned long int lrv_a0; + unsigned long int lrv_a1; + double lrv_fa0; + double lrv_fa1; +} La_riscv_retval; + +__BEGIN_DECLS + +extern ElfW (Addr) la_riscv_gnu_pltenter (ElfW (Sym) *__sym, unsigned int __ndx, + uintptr_t *__refcook, + uintptr_t *__defcook, + La_riscv_regs *__regs, + unsigned int *__flags, + const char *__symname, + long int *__framesizep); +extern unsigned int la_riscv_gnu_pltexit (ElfW (Sym) *__sym, unsigned int __ndx, + uintptr_t *__refcook, + uintptr_t *__defcook, + const La_riscv_regs *__inregs, + La_riscv_retval *__outregs, + const char *__symname); + +__END_DECLS diff --git a/sysdeps/riscv/dl-machine.h b/sysdeps/riscv/dl-machine.h new file mode 100644 index 000000000000..af9d50c008b0 --- /dev/null +++ b/sysdeps/riscv/dl-machine.h @@ -0,0 +1,323 @@ +/* Machine-dependent ELF dynamic relocation inline functions. RISC-V version. + Copyright (C) 2011-2018 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 + . */ + +#ifndef dl_machine_h +#define dl_machine_h + +#define ELF_MACHINE_NAME "RISC-V" + +#include +#include +#include +#include + +#ifndef _RTLD_PROLOGUE +# define _RTLD_PROLOGUE(entry) \ + ".globl\t" __STRING (entry) "\n\t" \ + ".type\t" __STRING (entry) ", @function\n" \ + __STRING (entry) ":\n\t" +#endif + +#ifndef _RTLD_EPILOGUE +# define _RTLD_EPILOGUE(entry) \ + ".size\t" __STRING (entry) ", . - " __STRING (entry) "\n\t" +#endif + +#define ELF_MACHINE_JMP_SLOT R_RISCV_JUMP_SLOT + +#define elf_machine_type_class(type) \ + ((ELF_RTYPE_CLASS_PLT * ((type) == ELF_MACHINE_JMP_SLOT \ + || (__WORDSIZE == 32 && (type) == R_RISCV_TLS_DTPREL32) \ + || (__WORDSIZE == 32 && (type) == R_RISCV_TLS_DTPMOD32) \ + || (__WORDSIZE == 32 && (type) == R_RISCV_TLS_TPREL32) \ + || (__WORDSIZE == 64 && (type) == R_RISCV_TLS_DTPREL64) \ + || (__WORDSIZE == 64 && (type) == R_RISCV_TLS_DTPMOD64) \ + || (__WORDSIZE == 64 && (type) == R_RISCV_TLS_TPREL64))) \ + | (ELF_RTYPE_CLASS_COPY * ((type) == R_RISCV_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 __attribute_used__ +elf_machine_matches_host (const ElfW (Ehdr) *ehdr) +{ + /* We can only run RISC-V binaries. */ + if (ehdr->e_machine != EM_RISCV) + return 0; + + /* Ensure the library's floating-point ABI matches that of the running + system. For now we don't support mixing XLEN, so there's no need (or way) + to check it matches. */ +#ifdef __riscv_float_abi_double + if ((ehdr->e_flags & EF_RISCV_FLOAT_ABI) != EF_RISCV_FLOAT_ABI_DOUBLE) + return 0; +#else + if ((ehdr->e_flags & EF_RISCV_FLOAT_ABI) != EF_RISCV_FLOAT_ABI_SOFT) + return 0; +#endif + + return 1; +} + +/* Return the link-time address of _DYNAMIC. */ +static inline ElfW (Addr) +elf_machine_dynamic (void) +{ + extern ElfW (Addr) _GLOBAL_OFFSET_TABLE_ __attribute__ ((visibility ("hidden"))); + return _GLOBAL_OFFSET_TABLE_; +} + +#define STRINGXP(X) __STRING (X) +#define STRINGXV(X) STRINGV_ (X) +#define STRINGV_(...) # __VA_ARGS__ + +/* Return the run-time load address of the shared object. */ +static inline ElfW (Addr) +elf_machine_load_address (void) +{ + ElfW (Addr) load_addr; + asm ("lla %0, _DYNAMIC" : "=r" (load_addr)); + return load_addr - elf_machine_dynamic (); +} + +/* 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) "\ + mv a0, sp\n\ + jal _dl_start\n\ + # Stash user entry point in s0.\n\ + mv s0, a0\n\ + # See if we were run as a command with the executable file\n\ + # name as an extra leading argument.\n\ + lw a0, _dl_skip_args\n\ + # Load the original argument count.\n\ + " STRINGXP (REG_L) " a1, 0(sp)\n\ + # Subtract _dl_skip_args from it.\n\ + sub a1, a1, a0\n\ + # Adjust the stack pointer to skip _dl_skip_args words.\n\ + sll a0, a0, " STRINGXP (PTRLOG) "\n\ + add sp, sp, a0\n\ + # Save back the modified argument count.\n\ + " STRINGXP (REG_S) " a1, 0(sp)\n\ + # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\ + " STRINGXP (REG_L) " a0, _rtld_local\n\ + add a2, sp, " STRINGXP (SZREG) "\n\ + sll a3, a1, " STRINGXP (PTRLOG) "\n\ + add a3, a3, a2\n\ + add a3, a3, " STRINGXP (SZREG) "\n\ + # Call the function to run the initializers.\n\ + jal _dl_init\n\ + # Pass our finalizer function to _start.\n\ + lla a0, _dl_fini\n\ + # Jump to the user entry point.\n\ + jr s0\n\ + " _RTLD_EPILOGUE (ENTRY_POINT) "\ + .previous" \ +); + +/* Names of the architecture-specific auditing callback functions. */ +#define ARCH_LA_PLTENTER riscv_gnu_pltenter +#define ARCH_LA_PLTEXIT riscv_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. */ + +auto inline void +__attribute__ ((always_inline)) +elf_machine_rela (struct link_map *map, 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 (&sym, version, r_type); + ElfW (Addr) value = 0; + if (sym_map != NULL) + value = sym_map->l_addr + sym->st_value + reloc->r_addend; + + switch (r_type) + { +#ifndef RTLD_BOOTSTRAP + case __WORDSIZE == 64 ? R_RISCV_TLS_DTPMOD64 : R_RISCV_TLS_DTPMOD32: + if (sym_map) + *addr_field = sym_map->l_tls_modid; + break; + + case __WORDSIZE == 64 ? R_RISCV_TLS_DTPREL64 : R_RISCV_TLS_DTPREL32: + if (sym != NULL) + *addr_field = TLS_DTPREL_VALUE (sym) + reloc->r_addend; + break; + + case __WORDSIZE == 64 ? R_RISCV_TLS_TPREL64 : R_RISCV_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_RISCV_COPY: + { + if (__glibc_unlikely (sym == NULL)) + /* This can happen in trace mode if an object could not be + found. */ + break; + + /* Handle TLS copy relocations. */ + if (__glibc_unlikely (ELFW (ST_TYPE) (sym->st_info) == STT_TLS)) + { + /* There's nothing to do if the symbol is in .tbss. */ + if (__glibc_likely (sym->st_value >= sym_map->l_tls_initimage_size)) + break; + value += (ElfW (Addr)) sym_map->l_tls_initimage - sym_map->l_addr; + } + + size_t size = sym->st_size; + if (__glibc_unlikely (sym->st_size != refsym->st_size)) + { + const char *strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]); + if (sym->st_size > refsym->st_size) + size = refsym->st_size; + if (sym->st_size > refsym->st_size || GLRO (dl_verbose)) + _dl_error_printf ("\ + %s: Symbol `%s' has different size in shared object, consider re-linking\n", + rtld_progname ?: "", + strtab + refsym->st_name); + } + + memcpy (reloc_addr, (void *)value, size); + break; + } +#endif + +#if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC + case R_RISCV_RELATIVE: + { +# if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC + /* This is defined in rtld.c, but nowhere in the static libc.a; + make the reference weak so static programs can still link. + This declaration cannot be done when compiling rtld.c + (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the + common defn for _dl_rtld_map, which is incompatible with a + weak decl in the same file. */ +# ifndef SHARED + weak_extern (GL (dl_rtld_map)); +# endif + if (map != &GL (dl_rtld_map)) /* Already done in rtld itself. */ +# endif + *addr_field = map->l_addr + reloc->r_addend; + break; + } +#endif + + case R_RISCV_JUMP_SLOT: + case __WORDSIZE == 64 ? R_RISCV_64 : R_RISCV_32: + *addr_field = value; + break; + + case R_RISCV_NONE: + break; + + default: + _dl_reloc_bad_type (map, r_type, 0); + break; + } +} + +auto 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; +} + +auto inline void +__attribute__ ((always_inline)) +elf_machine_lazy_rel (struct link_map *map, 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_RISCV_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 + _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. */ + +auto inline int +__attribute__ ((always_inline)) +elf_machine_runtime_setup (struct link_map *l, 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]); + /* If a library is prelinked but we have to relocate anyway, + we have to be able to undo the prelinking of .got.plt. + The prelinker saved the address of .plt for us here. */ + if (gotplt[1]) + l->l_mach.plt = gotplt[1] + l->l_addr; + gotplt[0] = (ElfW (Addr)) &_dl_runtime_resolve; + gotplt[1] = (ElfW (Addr)) l; + } +#endif + + return lazy; +} + +#endif /* RESOLVE_MAP */ diff --git a/sysdeps/riscv/ldsodefs.h b/sysdeps/riscv/ldsodefs.h new file mode 100644 index 000000000000..10ba15e774eb --- /dev/null +++ b/sysdeps/riscv/ldsodefs.h @@ -0,0 +1,47 @@ +/* Run-time dynamic linker data structures for loaded ELF shared objects. + Copyright (C) 2011-2018 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 + . */ + +#ifndef _RISCV_LDSODEFS_H +#define _RISCV_LDSODEFS_H 1 + +#include + +struct La_riscv_regs; +struct La_riscv_retval; + +#define ARCH_PLTENTER_MEMBERS \ + ElfW (Addr) (*riscv_gnu_pltenter) (ElfW (Sym) *, unsigned int, \ + uintptr_t *, uintptr_t *, \ + const struct La_riscv_regs *, \ + unsigned int *, const char *name, \ + long int *framesizep); + +#define ARCH_PLTEXIT_MEMBERS \ + unsigned int (*riscv_gnu_pltexit) (ElfW (Sym) *, unsigned int, \ + uintptr_t *, uintptr_t *, \ + const struct La_riscv_regs *, \ + struct La_riscv_retval *, \ + const char *); + +/* The RISC-V ABI specifies that the dynamic section has to be read-only. */ + +#define DL_RO_DYN_SECTION 1 + +#include_next + +#endif diff --git a/sysdeps/riscv/linkmap.h b/sysdeps/riscv/linkmap.h new file mode 100644 index 000000000000..6bf44b562ffc --- /dev/null +++ b/sysdeps/riscv/linkmap.h @@ -0,0 +1,4 @@ +struct link_map_machine + { + ElfW (Addr) plt; /* Address of .plt. */ + }; diff --git a/sysdeps/riscv/sotruss-lib.c b/sysdeps/riscv/sotruss-lib.c new file mode 100644 index 000000000000..42dff2d97849 --- /dev/null +++ b/sysdeps/riscv/sotruss-lib.c @@ -0,0 +1,51 @@ +/* Override generic sotruss-lib.c to define actual functions for RISC-V. + Copyright (C) 2012-2018 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 + . */ + +#define HAVE_ARCH_PLTENTER +#define HAVE_ARCH_PLTEXIT + +#include + +ElfW (Addr) +la_riscv_gnu_pltenter (ElfW (Sym) *sym __attribute__ ((unused)), + unsigned int ndx __attribute__ ((unused)), + uintptr_t *refcook, uintptr_t *defcook, + La_riscv_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_riscv_gnu_pltexit (ElfW (Sym) *sym, unsigned int ndx, uintptr_t *refcook, + uintptr_t *defcook, + const struct La_riscv_regs *inregs, + struct La_riscv_retval *outregs, + const char *symname) +{ + print_exit (refcook, defcook, symname, outregs->lrv_a0); + + return 0; +} diff --git a/sysdeps/riscv/start.S b/sysdeps/riscv/start.S new file mode 100644 index 000000000000..4635ddb5eb8c --- /dev/null +++ b/sysdeps/riscv/start.S @@ -0,0 +1,81 @@ +/* Startup code compliant to the ELF RISC-V ABI. + Copyright (C) 1995-2018 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. + + In addition to the permissions in the GNU Lesser General Public + License, the Free Software Foundation gives you unlimited + permission to link the compiled version of this file with other + programs, and to distribute those programs without any restriction + coming from the use of this file. (The GNU Lesser General Public + License restrictions do apply in other respects; for example, they + cover modification of the file, and distribution when not linked + into another program.) + + Note that people who make modified versions of this file are not + obligated to grant this special exception for their modified + versions; it is their choice whether to do so. The GNU Lesser + General Public License gives permission to release a modified + version without this exception; this exception also makes it + possible to release a modified version which carries forward this + exception. + + 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 + . */ + +#define __ASSEMBLY__ 1 +#include +#include +#include + +/* 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. */ + +ENTRY (ENTRY_POINT) + call .Lload_gp + mv a5, a0 /* rtld_fini. */ + /* main may be in a shared library. */ + la a0, main + REG_L a1, 0(sp) /* argc. */ + addi a2, sp, SZREG /* argv. */ + andi sp, sp, ALMASK /* Align stack. */ + lla a3, __libc_csu_init + lla a4, __libc_csu_fini + mv a6, sp /* stack_end. */ + + tail __libc_start_main@plt +END (ENTRY_POINT) + +/* Dynamic links need the global pointer to be initialized prior to calling + any shared library's initializers, so we use preinit_array to load it. + This doesn't cut it for static links, though, since the global pointer + needs to be initialized before calling __libc_start_main in that case. + So we redundantly initialize it at the beginning of _start. */ + +.Lload_gp: +.option push +.option norelax + lla gp, __global_pointer$ +.option pop + ret + + .section .preinit_array,"aw" + .dc.a .Lload_gp + +/* Define a symbol for the first piece of initialized data. */ + .data + .globl __data_start +__data_start: + .weak data_start + data_start = __data_start diff --git a/sysdeps/riscv/tst-audit.h b/sysdeps/riscv/tst-audit.h new file mode 100644 index 000000000000..7cce56d1046f --- /dev/null +++ b/sysdeps/riscv/tst-audit.h @@ -0,0 +1,23 @@ +/* Definitions for testing PLT entry/exit auditing. RISC-V version. + Copyright (C) 2005-2018 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 + . */ + +#define pltenter la_riscv_gnu_pltenter +#define pltexit la_riscv_gnu_pltexit +#define La_regs La_riscv_regs +#define La_retval La_riscv_retval +#define int_retval lrv_a0