[v4,08/11] nds32: Linux ABI

Message ID 1559735815-20093-9-git-send-email-vincentc@andestech.com
State New
Headers show
Series
  • nds32 glibc port, v4
Related show

Commit Message

Vincent Chen June 5, 2019, 11:56 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/fcntl.h: New file.
	* sysdeps/unix/sysv/linux/nds32/bits/procfs.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/bits/shmlba.h: Likewise.
	* sysdeps/unix/sysv/linux/nds32/fpu/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c: Likewise.
	* sysdeps/unix/sysv/linux/nds32/fpu/mremap.c: Likewise.
	* sysdeps/unix/sysv/linux/nds32/fpu/prctl.c: Likewise.
	* sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c: 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/fcntl.h      |  53 ++++++++
 sysdeps/unix/sysv/linux/nds32/bits/procfs.h     |  40 ++++++
 sysdeps/unix/sysv/linux/nds32/bits/shmlba.h     |  24 ++++
 sysdeps/unix/sysv/linux/nds32/fpu/Makefile      |   3 +
 sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c       |  37 ++++++
 sysdeps/unix/sysv/linux/nds32/fpu/mremap.c      |  37 ++++++
 sysdeps/unix/sysv/linux/nds32/fpu/prctl.c       |  40 ++++++
 sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c    |  50 ++++++++
 sysdeps/unix/sysv/linux/nds32/getcontext.S      | 102 ++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/init-first.c      |  48 ++++++++
 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      | 111 +++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/sigcontextinfo.h  |  35 ++++++
 sysdeps/unix/sysv/linux/nds32/swapcontext.S     | 154 ++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/nds32/sys/cachectl.h    |  33 +++++
 sysdeps/unix/sysv/linux/nds32/sys/ucontext.h    |  88 ++++++++++++++
 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    |  28 +++++
 sysdeps/unix/sysv/linux/nds32/vfork.S           |  46 +++++++
 23 files changed, 1094 insertions(+)
 create mode 100644 sysdeps/unix/sysv/linux/nds32/bits/fcntl.h
 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/fpu/Makefile
 create mode 100644 sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c
 create mode 100644 sysdeps/unix/sysv/linux/nds32/fpu/mremap.c
 create mode 100644 sysdeps/unix/sysv/linux/nds32/fpu/prctl.c
 create mode 100644 sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c
 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

-- 
1.9.5

Comments

Joseph Myers June 6, 2019, 10:45 p.m. | #1
On Wed, 5 Jun 2019, Vincent Chen wrote:

> +int __ioctl (int __fd, unsigned long int __request, ...)

> +{

> +	unsigned long arg1;


Example coding style issue, indentation should be two columns not eight 
(tabs are always eight columns in glibc sources), as well as the 
previously noted issue of function name starting a new line.

> +	return INLINE_SYSCALL(ioctl,3,__fd,__request,arg1);


Example coding style issue, missing spaces after ','.

> +int __prctl (int __option, ...)

> +{

> +	unsigned long arg1,arg2,arg3,arg4;

> +	va_list arg;

> +	va_start (arg, __option);

> +	arg1 = va_arg (arg, unsigned long);

> +	arg2 = va_arg (arg, unsigned long);

> +	arg3 = va_arg (arg, unsigned long);

> +	arg4 = va_arg (arg, unsigned long);


Example coding style issue, should be "unsigned long int".

> +#ifdef __USE_MISC

> +# define __ctx(fld) fld

> +#else

> +# define __ctx(fld) __ ## fld

> +#endif


__ctx is only expected to be used for old ports where there might be 
existing code relying on the old names and we want as much API 
compatibility as possible.  For new ports, just use the __* names in this 
header unconditionally rather than having such a macro at all.

-- 
Joseph S. Myers
joseph@codesourcery.com
Vincent Chen June 10, 2019, 2:53 a.m. | #2
On Fri, Jun 07, 2019 at 06:45:13AM +0800, Joseph Myers wrote:
> On Wed, 5 Jun 2019, Vincent Chen wrote:

> 

> > +int __ioctl (int __fd, unsigned long int __request, ...)

> > +{

> > +	unsigned long arg1;

> 

> Example coding style issue, indentation should be two columns not eight 

> (tabs are always eight columns in glibc sources), as well as the 

> previously noted issue of function name starting a new line.

> 

> > +	return INLINE_SYSCALL(ioctl,3,__fd,__request,arg1);

> 

> Example coding style issue, missing spaces after ','.

> 

> > +int __prctl (int __option, ...)

> > +{

> > +	unsigned long arg1,arg2,arg3,arg4;

> > +	va_list arg;

> > +	va_start (arg, __option);

> > +	arg1 = va_arg (arg, unsigned long);

> > +	arg2 = va_arg (arg, unsigned long);

> > +	arg3 = va_arg (arg, unsigned long);

> > +	arg4 = va_arg (arg, unsigned long);

> 

> Example coding style issue, should be "unsigned long int".

> 

> > +#ifdef __USE_MISC

> > +# define __ctx(fld) fld

> > +#else

> > +# define __ctx(fld) __ ## fld

> > +#endif

> 

> __ctx is only expected to be used for old ports where there might be 

> existing code relying on the old names and we want as much API 

> compatibility as possible.  For new ports, just use the __* names in this 

> header unconditionally rather than having such a macro at all.

>


OK, I got it. I will remove __ctx macro and replace __ctx with prifix __.
Also, I will fix the above codeing style issues in the next submission.

Thanks,
Vincent

> -- 

> Joseph S. Myers

> joseph@codesourcery.com

Patch

diff --git a/sysdeps/unix/sysv/linux/nds32/bits/fcntl.h b/sysdeps/unix/sysv/linux/nds32/bits/fcntl.h
new file mode 100644
index 0000000..1b27ebe
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/bits/fcntl.h
@@ -0,0 +1,53 @@ 
+/* O_*, F_*, FD_* bit values.  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/>.  */
+
+#ifndef _FCNTL_H
+# error "Never use <bits/fcntl.h> directly; include <fcntl.h> instead."
+#endif
+
+#include <sys/types.h>
+
+typedef struct flock
+  {
+    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
+    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
+#ifndef __USE_FILE_OFFSET64
+    __off_t l_start;	/* Offset where the lock begins.  */
+    __off_t l_len;	/* Size of the locked area; zero means until EOF.  */
+#else
+    __off64_t l_start;	/* Offset where the lock begins.  */
+    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
+#endif
+    __pid_t l_pid;	/* Process holding the lock.  */
+} flock_t;
+
+#ifdef __USE_LARGEFILE64
+struct flock64
+  {
+    short int l_type;	/* Type of lock: F_RDLCK, F_WRLCK, or F_UNLCK.  */
+    short int l_whence;	/* Where `l_start' is relative to (like `lseek').  */
+    __off64_t l_start;	/* Offset where the lock begins.  */
+    __off64_t l_len;	/* Size of the locked area; zero means until EOF.  */
+    __pid_t l_pid;	/* Process holding the lock.  */
+  };
+#endif
+
+
+/* Include generic Linux declarations.  */
+#include <bits/fcntl-linux.h>
+
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..94a3893
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/bits/procfs.h
@@ -0,0 +1,40 @@ 
+/* 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 elf_greg_t;
+/* Type for a floating-point registers.  */
+typedef long long elf_fpreg_t;
+
+/* And the whole bunch of them.  We could have used `struct
+   user_regs' directly in the typedef, but tradition says that
+   the register set is an array, which does have some peculiar
+   semantics, so leave it that way.  */
+
+#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/fpu/Makefile b/sysdeps/unix/sysv/linux/nds32/fpu/Makefile
new file mode 100644
index 0000000..7d96145
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/fpu/Makefile
@@ -0,0 +1,3 @@ 
+ifeq ($(subdir),math)
+libm-support += fp_udfiex_crtl
+endif
diff --git a/sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c b/sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c
new file mode 100644
index 0000000..bb8268b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/fpu/ioctl.c
@@ -0,0 +1,37 @@ 
+/* Control device.
+   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 <errno.h>
+#include <stdarg.h>
+#include <sysdep.h>
+
+#include <sys/ioctl.h>
+#include <sys/syscall.h>
+
+int __ioctl (int __fd, unsigned long int __request, ...)
+{
+	unsigned long arg1;
+	va_list arg;
+	va_start (arg, __request);
+	arg1 = va_arg (arg, unsigned long);
+	va_end (arg);
+	return INLINE_SYSCALL(ioctl,3,__fd,__request,arg1);
+}
+libc_hidden_def (__ioctl)
+weak_alias (__ioctl, ioctl)
diff --git a/sysdeps/unix/sysv/linux/nds32/fpu/mremap.c b/sysdeps/unix/sysv/linux/nds32/fpu/mremap.c
new file mode 100644
index 0000000..21dc5f2
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/fpu/mremap.c
@@ -0,0 +1,37 @@ 
+/* Re-map a virtual memory address.
+   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 <errno.h>
+#include <stdarg.h>
+#include <sysdep.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+
+void *__mremap (void *__addr, size_t __old_len, size_t __new_len, int __flags, ...)
+{
+	unsigned long arg1;
+	va_list arg;
+	va_start (arg, __flags);
+	arg1 = va_arg (arg, int);
+	va_end (arg);
+	return (void *)INLINE_SYSCALL(mremap,5,__addr,__old_len,__new_len,__flags,arg1);
+}
+weak_alias (__mremap, mremap)
+libc_hidden_def (__mremap)
diff --git a/sysdeps/unix/sysv/linux/nds32/fpu/prctl.c b/sysdeps/unix/sysv/linux/nds32/fpu/prctl.c
new file mode 100644
index 0000000..150a453
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/fpu/prctl.c
@@ -0,0 +1,40 @@ 
+/* Operations on a process.
+   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 <errno.h>
+#include <stdarg.h>
+#include <sysdep.h>
+#include <sys/prctl.h>
+#include <sys/syscall.h>
+int prctl (int __option, ...);
+libc_hidden_proto(prctl)
+
+int __prctl (int __option, ...)
+{
+	unsigned long arg1,arg2,arg3,arg4;
+	va_list arg;
+	va_start (arg, __option);
+	arg1 = va_arg (arg, unsigned long);
+	arg2 = va_arg (arg, unsigned long);
+	arg3 = va_arg (arg, unsigned long);
+	arg4 = va_arg (arg, unsigned long);
+	va_end (arg);
+	return INLINE_SYSCALL(prctl,5,__option,arg1,arg2,arg3,arg4);
+}
+weak_alias( __prctl,prctl)
+libc_hidden_weak (prctl)
diff --git a/sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c b/sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c
new file mode 100644
index 0000000..dfc1aac
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/fpu/setfpucw.c
@@ -0,0 +1,50 @@ 
+/* Set the FPU control word.  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 <math.h>
+#include <ldsodefs.h>
+#include <fpu_control.h>
+#include <libc-internal.h>
+
+void
+__setfpucw (fpu_control_t set)
+{
+
+  fpu_control_t cw;
+  /* Fetch the current control word.  */
+  _FPU_GETCW (cw);
+
+  /* Preserve the reserved bits, and set the rest as the user
+     specified (or the default, if the user gave zero).  */
+  cw &= _FPU_RESERVED;
+  cw |= set & ~_FPU_RESERVED;
+
+
+  /* GLRO(dl_fpu_control) == _FPU_DEFAULT_SUPPORT_SUBNORMAL_OUTPUT indicates
+   * Kernel will recalculate the underflow operation to support denormalize
+   * output. To ensure each that an underflow exception is issued each time a
+   * denormalize output occurs, the enable bit of underflow exception in
+   * $fpcsr shall be set by default.
+   */
+  if (GLRO(dl_fpu_control) == _FPU_DEFAULT_SUPPORT_SUBNORMAL_OUTPUT) {
+    __fpu_control = GLRO(dl_fpu_control);
+    cw |= FPU_MASK_SUBOUT;
+  }
+  _FPU_SETCW (cw);
+
+}
diff --git a/sysdeps/unix/sysv/linux/nds32/getcontext.S b/sysdeps/unix/sysv/linux/nds32/getcontext.S
new file mode 100644
index 0000000..8d29096
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/getcontext.S
@@ -0,0 +1,102 @@ 
+/* 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 <asm/fp_udfiex_crtl.h>
+
+#include "ucontext_i.h"
+
+/*  __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
+#ifdef __NDS32_ABI_2FP_PLUS__
+	move	$r4, $r0
+#endif
+
+/* 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
+
+
+#ifdef __NDS32_ABI_2FP_PLUS__
+	addi	$r2, $r4, UCONTEXT_FDREGS
+/* Process for FPU registers.  */
+	fmfcfg	$r20	/* Keep $fpcfg in $r20.  */
+	slli	$r20, $r20, #28
+	srli	$r20, $r20, #30	/* Set $r20 as $fpcfg.freg.  */
+
+	/* Case switch for $r20 as $fpcfg.freg.  */
+	beqz	$r20, .LCFG0		/* Branch if $fpcfg.freg = 0b00.  */
+	xori	$r15, $r20, #0b10
+	beqz	$r15, .LCFG2		/* Branch if $fpcfg.freg = 0b10.  */
+	srli	$r20, $r20, #0b01
+	beqz	$r20, .LCFG1		/* Branch if $fpcfg.freg = 0b01.  */
+	/* Fall-through if $fpcfg.freg = 0b11.  */
+.LCFG3:
+	fsdi $fd31, [$r2 + 248]
+	fsdi $fd30, [$r2 + 240]
+	fsdi $fd29, [$r2 + 232]
+	fsdi $fd28, [$r2 + 224]
+	fsdi $fd27, [$r2 + 216]
+	fsdi $fd26, [$r2 + 208]
+	fsdi $fd25, [$r2 + 200]
+	fsdi $fd24, [$r2 + 192]
+.LCFG2:
+	fsdi $fd10, [$r2 + 80]
+	fsdi $fd9, [$r2 + 72]
+	fsdi $fd8, [$r2 + 64]
+.LCFG1:
+	fsdi $fd7, [$r2 + 56]
+	fsdi $fd6, [$r2 + 48]
+	fsdi $fd5, [$r2 + 40]
+	fsdi $fd4, [$r2 + 32]
+.LCFG0:
+	fsdi $fd3, [$r2 + 24]
+	/* save fpcsr.  */
+	fmfcsr $r1
+	swi $r1, [$r2 + 0x100]
+	/* save the status of udf and iex trap.  */
+	movi 	$r0, GET_UDF_IEX_TRAP
+	movi	$r15, SYS_ify(fp_udfiex_crtl)
+	syscall SYS_ify(fp_udfiex_crtl)
+	bltz	$r0, .err
+	swi $r0, [$r2 + 0x104]
+	movi	$r0, 0
+#endif /* __NDS32_ABI_2FP_PLUS__.  */
+        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..aada091
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/init-first.c
@@ -0,0 +1,48 @@ 
+/* 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 *);
+int (*VDSO_SYMBOL(clock_gettime)) (clockid_t, struct timespec *);
+
+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..de01d16
--- /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..f1d2fd7
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/setcontext.S
@@ -0,0 +1,111 @@ 
+/* 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
+
+#ifdef __NDS32_ABI_2FP_PLUS__
+        addi    $r3,  $r4, UCONTEXT_FDREGS
+
+        fmfcfg  $r20    /* Keep $fpcfg in $r20.  */
+        slli    $r20, $r20, #28
+        srli    $r20, $r20, #30 /* Set $r20 as $fpcfg.freg.  */
+
+
+        /* Case switch for $r20 as $fpcfg.freg.  */
+        beqz    $r20, .LCFG0         /* Branch if $fpcfg.freg = 0b00.  */
+        xori    $r15, $r20, #0b10
+        beqz    $r15, .LCFG2         /* Branch if $fpcfg.freg = 0b10.  */
+        srli    $r20, $r20, #0b01
+        beqz    $r20, .LCFG1         /* Branch if $fpcfg.freg = 0b01.  */
+        /* Fall-through if $fpcfg.freg = 0b11.  */
+.LCFG3:
+        fldi $fd31, [$r3 + 248]
+        fldi $fd30, [$r3 + 240]
+        fldi $fd29, [$r3 + 232]
+        fldi $fd28, [$r3 + 224]
+        fldi $fd27, [$r3 + 216]
+        fldi $fd26, [$r3 + 208]
+        fldi $fd25, [$r3 + 200]
+        fldi $fd24, [$r3 + 192]
+.LCFG2:
+        fldi $fd10, [$r3 + 80]
+        fldi $fd9, [$r3 + 72]
+        fldi $fd8, [$r3 + 64]
+.LCFG1:
+        fldi $fd7, [$r3 + 56]
+        fldi $fd6, [$r3 + 48]
+        fldi $fd5, [$r3 + 40]
+        fldi $fd4, [$r3 + 32]
+.LCFG0:
+        fldi $fd3, [$r3 + 24]
+        /* save fpcsr.  */
+        lwi $r1, [$r3 + 0x100]
+        fmtcsr $r1
+	/* save the status of udf and iex trap.  */
+	lwi 	$r0, [$r3 + 0x104]
+	bltz	$r0, 1f
+	movi	$r15, SYS_ify(fp_udfiex_crtl)
+	syscall SYS_ify(fp_udfiex_crtl)
+1:
+#endif /* __NDS32_ABI_2FP_PLUS__.  */
+
+        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..b3faade
--- /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..9f489fd
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/swapcontext.S
@@ -0,0 +1,154 @@ 
+/* 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 <asm/fp_udfiex_crtl.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
+#ifdef __NDS32_ABI_2FP_PLUS__
+	addi	$r4, $r0, UCONTEXT_FDREGS
+#endif /* __NDS32_ABI_2FP_PLUS__.  */
+
+/* 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
+
+#ifdef __NDS32_ABI_2FP_PLUS__
+/* Process for FPU registers.  */
+	fmfcfg	$r20	/* Keep $fpcfg in $r20.  */
+	slli	$r20, $r20, #28
+	srli	$r20, $r20, #30	/* Set $r20 as $fpcfg.freg.  */
+
+	/* Case switch for $r20 as $fpcfg.freg.  */
+	beqz	$r20, .LCFG0		/* Branch if $fpcfg.freg = 0b00.  */
+	xori	$r15, $r20, #0b10
+	beqz	$r15, .LCFG2		/* Branch if $fpcfg.freg = 0b10.  */
+	srli	$r20, $r20, #0b01
+	beqz	$r20, .LCFG1		/* Branch if $fpcfg.freg = 0b01.  */
+	/* Fall-through if $fpcfg.freg = 0b11.  */
+.LCFG3:
+	fsdi $fd31, [$r4 + 248]
+	fsdi $fd30, [$r4 + 240]
+	fsdi $fd29, [$r4 + 232]
+	fsdi $fd28, [$r4 + 224]
+	fsdi $fd27, [$r4 + 216]
+	fsdi $fd26, [$r4 + 208]
+	fsdi $fd25, [$r4 + 200]
+	fsdi $fd24, [$r4 + 192]
+.LCFG2:
+	fsdi $fd10, [$r4 + 80]
+	fsdi $fd9, [$r4 + 72]
+	fsdi $fd8, [$r4 + 64]
+.LCFG1:
+	fsdi $fd7, [$r4 + 56]
+	fsdi $fd6, [$r4 + 48]
+	fsdi $fd5, [$r4 + 40]
+	fsdi $fd4, [$r4 + 32]
+.LCFG0:
+	fsdi $fd3, [$r4 + 24]
+	/* save fpcsr.  */
+	fmfcsr $r1
+	swi $r1, [$r4 + 0x100]
+	/* save the status of udf and iex trap.  */
+	movi 	$r0, GET_UDF_IEX_TRAP
+	movi	$r15, SYS_ify(fp_udfiex_crtl)
+	syscall SYS_ify(fp_udfiex_crtl)
+	swi $r0, [$r4 + 0x104]
+#endif /* __NDS32_ABI_2FP_PLUS__.  */
+
+
+
+#ifdef __NDS32_ABI_2FP_PLUS__
+	addi	$r0,  $r5, UCONTEXT_FDREGS
+	fmfcfg  $r20    /* Keep $fpcfg in $r20.  */
+	slli    $r20, $r20, #28
+	srli    $r20, $r20, #30 /* Set $r20 as $fpcfg.freg.  */
+
+	fmfcfg  $r20    /* Keep $fpcfg in $r20.  */
+	slli    $r20, $r20, #28
+	srli    $r20, $r20, #30 /* Set $r20 as $fpcfg.freg.  */
+
+	/* Case switch for $r20 as $fpcfg.freg.  */
+	beqz    $r20, .LCFG4         /* Branch if $fpcfg.freg = 0b00.  */
+	xori    $r15, $r20, #0b10
+	beqz    $r15, .LCFG6         /* Branch if $fpcfg.freg = 0b10.  */
+	srli    $r20, $r20, #0b01
+	beqz    $r20, .LCFG5         /* Branch if $fpcfg.freg = 0b01.  */
+	/* Fall-through if $fpcfg.freg = 0b11.  */
+.LCFG7:
+	fldi $fd31, [$r0 + 248]
+	fldi $fd30, [$r0 + 240]
+	fldi $fd29, [$r0 + 232]
+	fldi $fd28, [$r0 + 224]
+	fldi $fd27, [$r0 + 216]
+	fldi $fd26, [$r0 + 208]
+	fldi $fd25, [$r0 + 200]
+	fldi $fd24, [$r0 + 192]
+.LCFG6:
+	fldi $fd10, [$r0 + 80]
+	fldi $fd9, [$r0 + 72]
+	fldi $fd8, [$r0 + 64]
+.LCFG5:
+	fldi $fd7, [$r0 + 56]
+	fldi $fd6, [$r0 + 48]
+	fldi $fd5, [$r0 + 40]
+	fldi $fd4, [$r0 + 32]
+.LCFG4:
+	fldi $fd3, [$r0 + 24]
+	/* save fpcsr.  */
+	lwi $r1, [$r0 + 0x100]
+	fmtcsr $r1
+	/* save the status of udf and iex trap.  */
+	lwi 	$r0, [$r0 + 0x104]
+	bltz	$r0, 1f
+	movi	$r15, SYS_ify(fp_udfiex_crtl)
+	syscall SYS_ify(fp_udfiex_crtl)
+1:
+#endif /* __NDS32_ABI_2FP_PLUS__.  */
+
+        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..412b46f
--- /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..dc6bab4
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/sys/ucontext.h
@@ -0,0 +1,88 @@ 
+/* 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>
+
+
+#ifdef __USE_MISC
+# define __ctx(fld) fld
+#else
+# define __ctx(fld) __ ## fld
+#endif
+
+/* Context to describe whole processor state.  */
+
+typedef struct {
+        unsigned long int __ctx(trap_no);
+        unsigned long int __ctx(error_code);
+        unsigned long int __ctx(oldmask);
+        unsigned long int __ctx(nds32_r0);
+        unsigned long int __ctx(nds32_r1);
+        unsigned long int __ctx(nds32_r2);
+        unsigned long int __ctx(nds32_r3);
+        unsigned long int __ctx(nds32_r4);
+        unsigned long int __ctx(nds32_r5);
+        unsigned long int __ctx(nds32_r6);
+        unsigned long int __ctx(nds32_r7);
+        unsigned long int __ctx(nds32_r8);
+        unsigned long int __ctx(nds32_r9);
+        unsigned long int __ctx(nds32_r10);
+        unsigned long int __ctx(nds32_r11);
+        unsigned long int __ctx(nds32_r12);
+        unsigned long int __ctx(nds32_r13);
+        unsigned long int __ctx(nds32_r14);
+        unsigned long int __ctx(nds32_r15);
+        unsigned long int __ctx(nds32_r16);
+        unsigned long int __ctx(nds32_r17);
+        unsigned long int __ctx(nds32_r18);
+        unsigned long int __ctx(nds32_r19);
+        unsigned long int __ctx(nds32_r20);
+        unsigned long int __ctx(nds32_r21);
+        unsigned long int __ctx(nds32_r22);
+        unsigned long int __ctx(nds32_r23);
+        unsigned long int __ctx(nds32_r24);
+        unsigned long int __ctx(nds32_r25);
+        unsigned long int __ctx(nds32_fp);
+        unsigned long int __ctx(nds32_gp);
+        unsigned long int __ctx(nds32_lp);
+        unsigned long int __ctx(nds32_sp);
+        unsigned long int __ctx(nds32_ipc);
+        unsigned long int __ctx(fault_address);
+        unsigned long int __ctx(used_math_flag);
+        unsigned long long __ctx(fd_regs)[32];
+        unsigned long int __ctx(fpcsr);
+        unsigned long int __ctx(UDF_trap);
+        unsigned long int __ctx(zol)[3];
+} mcontext_t;
+
+
+/* Userlevel context.  */
+typedef struct ucontext_t
+  {
+    unsigned long int __ctx(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..266a158
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/nds32/ucontext_i.sym
@@ -0,0 +1,28 @@ 
+#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)
+#ifdef __NDS32_ABI_2FP_PLUS__
+UCONTEXT_FDREGS                 mcontext (fd_regs)
+#endif
+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..412706f
--- /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)