Patchwork [v5,08/11] nds32: Linux ABI

login
register
mail settings
Submitter Vincent Chen
Date June 20, 2019, 6:40 a.m.
Message ID <1561012838-11352-9-git-send-email-vincentc@andestech.com>
Download mbox | patch
Permalink /patch/33237/
State New
Headers show

Comments

Vincent Chen - June 20, 2019, 6:40 a.m.
Linux-specific code that is required for maintaining ABI compatibility.
This doesn't contain the actual system call interface, that is split out
in order to avoid having a patch that's too big.

2019-06-03  Vincent Chen  <vincentc@andestech.com>
2019-06-03  CheWei Chuang  <cnoize@andestech.com>

	* sysdeps/unix/sysv/linux/nds32/bits/procfs.h: New file.
	* sysdeps/unix/sysv/linux/nds32/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/getcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/nds32/init-first.c: Likewise.
	* sysdeps/unix/sysv/linux/nds32/ipc_priv.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/kernel-features.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/libc-vdso.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/makecontext.c: Likewise.
	* sysdeps/unix/sysv/linux/nds32/setcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/swapcontext.S: Likewise.
	* sysdeps/unix/sysv/linux/nds32/sys/cachectl.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/sys/ucontext.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/sys/user.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/sysctl.mk: Likewise.
	* sysdeps/unix/sysv/linux/nds32/ucontext_i.sym: Likewise.
	* sysdeps/unix/sysv/linux/nds32/vfork.S: Likewise.
---
 sysdeps/unix/sysv/linux/nds32/bits/procfs.h     | 35 +++++++++++
 sysdeps/unix/sysv/linux/nds32/bits/shmlba.h     | 24 ++++++++
 sysdeps/unix/sysv/linux/nds32/getcontext.S      | 51 ++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/init-first.c      | 52 ++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/ipc_priv.h        | 22 +++++++
 sysdeps/unix/sysv/linux/nds32/kernel-features.h | 31 ++++++++++
 sysdeps/unix/sysv/linux/nds32/libc-vdso.h       | 32 ++++++++++
 sysdeps/unix/sysv/linux/nds32/makecontext.c     | 57 +++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/setcontext.S      | 65 ++++++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h  | 35 +++++++++++
 sysdeps/unix/sysv/linux/nds32/swapcontext.S     | 57 +++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/sys/cachectl.h    | 33 ++++++++++
 sysdeps/unix/sysv/linux/nds32/sys/ucontext.h    | 81 +++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/sys/user.h        | 22 +++++++
 sysdeps/unix/sysv/linux/nds32/sysctl.mk         |  1 +
 sysdeps/unix/sysv/linux/nds32/ucontext_i.sym    | 25 ++++++++
 sysdeps/unix/sysv/linux/nds32/vfork.S           | 46 ++++++++++++++
 17 files changed, 669 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/nds32/bits/procfs.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/bits/shmlba.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/getcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/nds32/init-first.c
 create mode 100644 sysdeps/unix/sysv/linux/nds32/ipc_priv.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/kernel-features.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/libc-vdso.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/makecontext.c
 create mode 100644 sysdeps/unix/sysv/linux/nds32/setcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/swapcontext.S
 create mode 100644 sysdeps/unix/sysv/linux/nds32/sys/cachectl.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/sys/ucontext.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/sys/user.h
 create mode 100644 sysdeps/unix/sysv/linux/nds32/sysctl.mk
 create mode 100644 sysdeps/unix/sysv/linux/nds32/ucontext_i.sym
 create mode 100644 sysdeps/unix/sysv/linux/nds32/vfork.S

Patch

diff --git a/sysdeps/unix/sysv/linux/nds32/bits/procfs.h b/sysdeps/unix/sysv/linux/nds32/bits/procfs.h
new file mode 100644
index 0000000..cbecc8b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/bits/procfs.h
@@ -0,0 +1,35 @@ 
+/* Types for registers for sys/procfs.h.  Andes nds32 version.
+   Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _SYS_PROCFS_H
+# error "Never include <bits/procfs.h> directly; use <sys/procfs.h> instead."
+#endif
+
+#include <asm/ptrace.h>
+
+/* Type for a general-purpose register.  */
+typedef unsigned long int elf_greg_t;
+/* Type for a floating-point registers.  */
+typedef long long int  elf_fpreg_t;
+
+#define ELF_NGREG (sizeof (struct user_pt_regs) / sizeof (elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* Register set for the floating-point registers.  */
+#define ELF_NFPREG 33
+typedef elf_fpreg_t elf_fpregset_t[ELF_NFPREG];
diff --git a/sysdeps/unix/sysv/linux/nds32/bits/shmlba.h b/sysdeps/unix/sysv/linux/nds32/bits/shmlba.h
new file mode 100644
index 0000000..2a1e0d6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/bits/shmlba.h
@@ -0,0 +1,24 @@ 
+/* Define SHMLBA.  Andes nds32 version.
+   Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _SYS_SHM_H
+# error "Never use <bits/shmlba.h> directly; include <sys/shm.h> instead."
+#endif
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x8000
diff --git a/sysdeps/unix/sysv/linux/nds32/getcontext.S b/sysdeps/unix/sysv/linux/nds32/getcontext.S
new file mode 100644
index 0000000..e2f4c83
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/getcontext.S
@@ -0,0 +1,51 @@ 
+/* Save current context.  Andes LINUX/nds32 version.
+   Copyright (C) 2018-2019 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 <sysdep.h>
+#include "ucontext_i.h"
+
+/* int getcontext (const ucontext_t *ucp).  */
+
+ENTRY (__getcontext)
+        swi     $lp, [$r0 + UCONTEXT_PC]
+        addi    $r15, $r0, UCONTEXT_GREGS
+        xor     $r1, $r1, $r1
+	smw.bim	$r1, [$r15], $r1
+        addi    $r15, $r15, 20
+	smw.bim	$r6, [$r15], $r14
+        addi    $r15, $r15, 4
+	smw.bim	$r16, [$r15], $r25, #0xf
+
+/* rt_sigprocmask (SIG_BLOCK, NULL, &ucp->uc_sigmask, _NSIG8).  */
+	move	$r3, _NSIG8
+	addi	$r2, $r0, UCONTEXT_SIGMASK
+	movi	$r1, 0
+	movi    $r0, SIG_BLOCK
+	movi	$r15, SYS_ify(rt_sigprocmask)
+	syscall 0x0
+        bnez    $r0, .err
+
+        ret
+
+.err:
+	j 	SYSCALL_ERROR_LABEL
+
+PSEUDO_END (__getcontext)
+
+weak_alias (__getcontext, getcontext)
+
diff --git a/sysdeps/unix/sysv/linux/nds32/init-first.c b/sysdeps/unix/sysv/linux/nds32/init-first.c
new file mode 100644
index 0000000..f3412c6
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/init-first.c
@@ -0,0 +1,52 @@ 
+/* VDSO initialization. Andes Nds32 version
+   Copyright (C) 2018-2019 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 <dl-vdso.h>
+#include <libc-vdso.h>
+
+int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
+    attribute_hidden;
+int (*VDSO_SYMBOL (clock_getres)) (clockid_t, struct timespec *)
+    attribute_hidden;
+int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
+    attribute_hidden;
+
+static inline void
+_libc_vdso_platform_setup (void)
+{
+  PREPARE_VERSION (linux4, "LINUX_4", 14921332);
+
+  void *p = _dl_vdso_vsym ("__vdso_gettimeofday", &linux4);
+
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (gettimeofday) = p;
+
+  p = _dl_vdso_vsym ("__vdso_clock_getres", &linux4);
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (clock_getres) = p;
+
+  p = _dl_vdso_vsym ("__vdso_clock_gettime", &linux4);
+  PTR_MANGLE (p);
+  VDSO_SYMBOL (clock_gettime) = p;
+
+}
+
+#define VDSO_SETUP _libc_vdso_platform_setup
+
+#include <csu/init-first.c>
diff --git a/sysdeps/unix/sysv/linux/nds32/ipc_priv.h b/sysdeps/unix/sysv/linux/nds32/ipc_priv.h
new file mode 100644
index 0000000..c88bbb1
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/ipc_priv.h
@@ -0,0 +1,22 @@ 
+/* Old SysV permission definition for Linux.  Andes nds32 version.
+   Copyright (C) 2018-2019 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 <sys/ipc.h>  /* For __key_t.  */
+
+#define __IPC_64	0x0
+
diff --git a/sysdeps/unix/sysv/linux/nds32/kernel-features.h b/sysdeps/unix/sysv/linux/nds32/kernel-features.h
new file mode 100644
index 0000000..4ab663e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/kernel-features.h
@@ -0,0 +1,31 @@ 
+/* Set flags signalling availability of kernel features based on given
+   kernel version number.  Andes nds32 version.
+   Copyright (C) 2018-2019 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_next <kernel-features.h>
+
+
+#undef __ASSUME_CLONE_DEFAULT
+#define __ASSUME_CLONE_BACKWARDS 1
+
+/* Define this if your 32-bit syscall API requires 64-bit register
+   pairs to start with an even-number register.  */
+#define __ASSUME_ALIGNED_REGISTER_PAIRS	1
+
+/* nds32 fadvise64_64 reorganize the syscall arguments.  */
+#define __ASSUME_FADVISE64_64_6ARG 1
diff --git a/sysdeps/unix/sysv/linux/nds32/libc-vdso.h b/sysdeps/unix/sysv/linux/nds32/libc-vdso.h
new file mode 100644
index 0000000..3247e09
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/libc-vdso.h
@@ -0,0 +1,32 @@ 
+/* VDSO function declaration, Andes nds32 version.
+   Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _LIBC_VDSO_H
+#define _LIBC_VDSO_H
+
+# include <sysdep-vdso.h>
+
+extern int (*VDSO_SYMBOL (gettimeofday)) (struct timeval *, void *)
+    attribute_hidden;
+extern int (*VDSO_SYMBOL (clock_gettime)) (clockid_t, struct timespec *)
+    attribute_hidden;
+extern int (*VDSO_SYMBOL (clock_getres)) (clockid_t, struct timespec *)
+    attribute_hidden;
+
+#endif /* _LIBC_VDSO_H.  */
diff --git a/sysdeps/unix/sysv/linux/nds32/makecontext.c b/sysdeps/unix/sysv/linux/nds32/makecontext.c
new file mode 100644
index 0000000..cbe9093
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/makecontext.c
@@ -0,0 +1,57 @@ 
+/* Create new context.  Andes nds32 version.
+   Copyright (C) 2018-2019 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 <stdarg.h>
+#include <stdint.h>
+#include <sys/ucontext.h>
+
+void
+__makecontext (ucontext_t *ucp, void (*func) (void), int argc, ...)
+{
+  extern void __startcontext (void);
+  unsigned long int *sp;
+  unsigned long int *regptr;
+  va_list ap;
+  int i;
+
+  sp = (unsigned long int *)
+    ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+
+  /* Allocate stack for 7-th, 8-th, ..., n-th arguments.  */
+  sp -= argc <= 6 ? 0 : argc - 6;
+
+  /* Keep the stack aligned.  */
+  sp = (unsigned long int *) (((uintptr_t) sp) & -8L);
+
+  ucp->uc_mcontext.__nds32_r6 = (uintptr_t) ucp->uc_link;
+  ucp->uc_mcontext.__nds32_sp = (uintptr_t) sp;
+  ucp->uc_mcontext.__nds32_ipc = (uintptr_t) func;
+  ucp->uc_mcontext.__nds32_lp = (uintptr_t) &__startcontext;
+
+  va_start (ap, argc);
+  regptr = &ucp->uc_mcontext.__nds32_r0;
+  for (i = 0; i < argc; ++i)
+    if (i < 6)
+      *regptr++ = va_arg (ap, unsigned long int);
+    else
+      sp[i - 6] = va_arg (ap, unsigned long int);
+
+  va_end (ap);
+
+}
+weak_alias (__makecontext, makecontext)
diff --git a/sysdeps/unix/sysv/linux/nds32/setcontext.S b/sysdeps/unix/sysv/linux/nds32/setcontext.S
new file mode 100644
index 0000000..22f5f0a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/setcontext.S
@@ -0,0 +1,65 @@ 
+/* Set current context.  Andes nds32 version.
+   Copyright (C) 2018-2019 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 <sysdep.h>
+
+#include "ucontext_i.h"
+
+/* int __setcontext (const ucontext_t *ucp).  */
+
+ENTRY (__setcontext)
+        move    $r4, $r0
+
+/* sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, NULL, _NSIG8).  */
+	move    $r0, SIG_SETMASK
+	addi	$r1, $r4, UCONTEXT_SIGMASK
+	movi	$r2, 0
+	movi	$r3, _NSIG8
+	movi	$r15, SYS_ify(rt_sigprocmask)
+	syscall SYS_ify(rt_sigprocmask)
+        bnez    $r0, .err
+
+        move    $r0,  $r4
+        addi    $r15, $r0, UCONTEXT_GREGS + 4
+	lmw.bim	$r1,  [$r15], $r14
+        addi    $r15, $r15, 4
+	lmw.bim	$r16, [$r15], $r25, #0xf
+        lwi     $r15, [$r0 + UCONTEXT_PC]
+        lwi     $r0,  [$r0 + UCONTEXT_GREGS]
+        jr      $r15
+.err:
+	j 	SYSCALL_ERROR_LABEL
+PSEUDO_END (__setcontext)
+
+weak_alias (__setcontext, setcontext)
+
+        cfi_startproc
+        cfi_undefined (lp)
+        nop16
+        cfi_endproc
+ENTRY (__startcontext)
+	beqz $r6, 1f
+        move $r0, $r6
+	jal __setcontext
+1:	
+	move $r0, 0
+	j HIDDEN_JUMPTARGET(exit)
+END (__startcontext)
+
+.hidden __startcontext
+ 
diff --git a/sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h b/sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h
new file mode 100644
index 0000000..5ee58be
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h
@@ -0,0 +1,35 @@ 
+/* Definitions for signal handling calling conventions.  Andes nds32 version.
+   Copyright (C) 2018-2019 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 <sys/ucontext.h>
+
+#define SIGCONTEXT siginfo_t *_si, struct ucontext_t *
+#define GET_PC(ctx)	((void *) (ctx)->uc_mcontext.__nds32_ipc)
+
+
+/* There is no reliable way to get the sigcontext unless we use a
+   three-argument signal handler.  */
+#define __sigaction(sig, act, oact) ({ \
+  (act)->sa_flags |= SA_SIGINFO; \
+  (__sigaction) (sig, act, oact); \
+})
+
+#define sigaction(sig, act, oact) ({ \
+  (act)->sa_flags |= SA_SIGINFO; \
+  (sigaction) (sig, act, oact); \
+})
diff --git a/sysdeps/unix/sysv/linux/nds32/swapcontext.S b/sysdeps/unix/sysv/linux/nds32/swapcontext.S
new file mode 100644
index 0000000..5691a5e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/swapcontext.S
@@ -0,0 +1,57 @@ 
+/* Save and set current context.  Andes nds32 version
+   Copyright (C) 2018-2019 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 <sysdep.h>
+#include "ucontext_i.h"
+
+/* int swapcontext (ucontext_t *oucp, const ucontext_t *ucp).  */
+
+ENTRY (__swapcontext)
+        move	$r5, $r1
+        swi     $lp, [$r0 + UCONTEXT_PC]
+        addi    $r15, $r0, UCONTEXT_GREGS
+        xor     $r1, $r1, $r1
+        smw.bim $r1, [$r15], $r1
+        addi    $r15, $r15, 20
+        smw.bim	$r6, [$r15], $r14
+        addi    $r15, $r15, 4
+        smw.bim	$r16, [$r15], $r25, #0xf
+
+/* rt_sigprocmask (SIG_SETMASK, &ucp->uc_sigmask, &oucp->uc_sigmask, _NSIG8).  */
+        move	$r3, _NSIG8
+        addi	$r2, $r0, UCONTEXT_SIGMASK
+        addi	$r1, $r5, UCONTEXT_SIGMASK
+        move    $r0, SIG_SETMASK
+        movi	$r15, SYS_ify(rt_sigprocmask)
+        syscall SYS_ify(rt_sigprocmask)
+        bnez    $r0, .err
+
+        move    $r0, $r5
+        addi    $r15, $r5, UCONTEXT_GREGS + 4
+        lmw.bim	$r1, [$r15], $r14
+        addi    $r15, $r15, 4
+        lmw.bim	$r16, [$r15], $r25, #0xf
+        lwi     $r15, [$r0 + UCONTEXT_PC]
+        lwi     $r0, [$r0 + UCONTEXT_GREGS]
+        jr      $r15
+
+.err:
+        j 	SYSCALL_ERROR_LABEL
+PSEUDO_END (__swapcontext)
+
+weak_alias (__swapcontext, swapcontext)
diff --git a/sysdeps/unix/sysv/linux/nds32/sys/cachectl.h b/sysdeps/unix/sysv/linux/nds32/sys/cachectl.h
new file mode 100644
index 0000000..688602d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sys/cachectl.h
@@ -0,0 +1,33 @@ 
+/* Andes nds32 cache flushing interface
+   Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H 1
+
+#include <features.h>
+
+/* Get the kernel definition for the __op argument.  */
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+
+extern int cacheflush (void *__addr, const int __end, const int __op) __THROW;
+
+__END_DECLS
+
+#endif /* sys/cachectl.h.  */
diff --git a/sysdeps/unix/sysv/linux/nds32/sys/ucontext.h b/sysdeps/unix/sysv/linux/nds32/sys/ucontext.h
new file mode 100644
index 0000000..79d2327
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sys/ucontext.h
@@ -0,0 +1,81 @@ 
+/* struct ucontext definition, Andes nds32 version.
+   Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <bits/types/sigset_t.h>
+#include <bits/types/stack_t.h>
+
+/* Context to describe whole processor state.  */
+
+typedef struct {
+        unsigned long int __trap_no;
+        unsigned long int __error_code;
+        unsigned long int __oldmask;
+        unsigned long int __nds32_r0;
+        unsigned long int __nds32_r1;
+        unsigned long int __nds32_r2;
+        unsigned long int __nds32_r3;
+        unsigned long int __nds32_r4;
+        unsigned long int __nds32_r5;
+        unsigned long int __nds32_r6;
+        unsigned long int __nds32_r7;
+        unsigned long int __nds32_r8;
+        unsigned long int __nds32_r9;
+        unsigned long int __nds32_r10;
+        unsigned long int __nds32_r11;
+        unsigned long int __nds32_r12;
+        unsigned long int __nds32_r13;
+        unsigned long int __nds32_r14;
+        unsigned long int __nds32_r15;
+        unsigned long int __nds32_r16;
+        unsigned long int __nds32_r17;
+        unsigned long int __nds32_r18;
+        unsigned long int __nds32_r19;
+        unsigned long int __nds32_r20;
+        unsigned long int __nds32_r21;
+        unsigned long int __nds32_r22;
+        unsigned long int __nds32_r23;
+        unsigned long int __nds32_r24;
+        unsigned long int __nds32_r25;
+        unsigned long int __nds32_fp;
+        unsigned long int __nds32_gp;
+        unsigned long int __nds32_lp;
+        unsigned long int __nds32_sp;
+        unsigned long int __nds32_ipc;
+        unsigned long int __fault_address;
+        unsigned long int __used_math_flag;
+        unsigned long long int __fd_regs[32];
+        unsigned long int __fpcsr;
+        unsigned long int __UDF_trap;
+        unsigned long int __zol[3];
+} mcontext_t;
+
+
+/* Userlevel context.  */
+typedef struct ucontext_t
+  {
+    unsigned long int __uc_flags;
+    struct ucontext_t *uc_link;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    __sigset_t uc_sigmask;
+  } ucontext_t;
+#endif /* _SYS_UCONTEXT_H.  */
diff --git a/sysdeps/unix/sysv/linux/nds32/sys/user.h b/sysdeps/unix/sysv/linux/nds32/sys/user.h
new file mode 100644
index 0000000..b529a0b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sys/user.h
@@ -0,0 +1,22 @@ 
+/* Copyright (C) 2018-2019 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/>.  */
+
+#ifndef _SYS_USER_H
+#define _SYS_USER_H	1
+
+
+#endif  /* _SYS_USER_H.  */
diff --git a/sysdeps/unix/sysv/linux/nds32/sysctl.mk b/sysdeps/unix/sysv/linux/nds32/sysctl.mk
new file mode 100644
index 0000000..cd10656
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sysctl.mk
@@ -0,0 +1 @@ 
+# nds32 doesn't support sysctl.
diff --git a/sysdeps/unix/sysv/linux/nds32/ucontext_i.sym b/sysdeps/unix/sysv/linux/nds32/ucontext_i.sym
new file mode 100644
index 0000000..c0cfafc
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/ucontext_i.sym
@@ -0,0 +1,25 @@ 
+#include <stddef.h>
+#include <signal.h>
+#include <sys/ucontext.h>
+
+--
+
+SIG_BLOCK
+SIG_SETMASK
+
+_NSIG8          (_NSIG / 8)
+
+-- Offsets of the fields in the ucontext_t structure.
+#define ucontext(member)	offsetof (ucontext_t, member)
+#define mcontext(member)	ucontext (uc_mcontext.member)
+
+
+UCONTEXT_GREGS                  mcontext (__nds32_r0)
+UCONTEXT_PC                     mcontext (__nds32_ipc)
+
+
+UCONTEXT_FLAGS                  ucontext (__uc_flags)
+UCONTEXT_LINK                   ucontext (uc_link)
+UCONTEXT_STACK                  ucontext (uc_stack)
+UCONTEXT_MCONTEXT               ucontext (uc_mcontext)
+UCONTEXT_SIGMASK                ucontext (uc_sigmask)
diff --git a/sysdeps/unix/sysv/linux/nds32/vfork.S b/sysdeps/unix/sysv/linux/nds32/vfork.S
new file mode 100644
index 0000000..0bd72de
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/vfork.S
@@ -0,0 +1,46 @@ 
+/* vfork for Linux.  Andes Linux/nds32 version.
+   Copyright (C) 2018-2019 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 <sysdep.h>
+#define _ERRNO_H    1
+#include <bits/errno.h>
+
+
+ENTRY (__libc_vfork)
+#ifdef PIC
+.pic
+#endif
+
+        movi $r0, #0x4111 /* 0x4111 = CLONE_VM | CLONE_VFORK | SIGCHLD.  */
+        move $r1, $sp
+        movi $r15, __NR_clone
+        syscall #0x0
+        bltz $r0, 2f
+1:
+        ret
+2:
+        sltsi $r1, $r0, -4096
+        bnez $r1, 1b;
+
+        j SYSCALL_ERROR_LABEL
+
+PSEUDO_END (__libc_vfork)
+
+weak_alias (__libc_vfork, vfork)
+strong_alias (__libc_vfork, __vfork)
+libc_hidden_def (__vfork)