nds32: add support for new architecture

Add support for Andes Technology NDS32 architecture.
See here http://www.andestech.com/en/index/index.htm for more
informaton. Verification of the port from an older uClibc
port was done on a sponsored AG101p board.

The testsuite only has 5 errors, three are related to
an existing bug in dlclose() with LT.old, also happening
on cris32 and m68k.

Failures to fallocate/posix_fallocate are unresolved.

Thanks to Andes Technology sponsoring the hardware and
being very helpful while doing the uClibc-ng porting.

Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>

62 files changed, 4679 insertions, 8 deletions

diff --git a/README b/README
index 002b6f9e8..9395b65cf 100644
--- a/README
+++ b/README
@@ -12,7 +12,7 @@ Porting applications from glibc to uClibc-ng typically involves just
 recompiling the source code.  uClibc-ng even supports shared libraries and
 threading. It currently runs on standard Linux and MMU-less (also
 known as µClinux) systems with support for ARC, ARM, Blackfin, i386, M68K/Coldfire
-MIPS, MIPS64, PowerPC, SH, Sparc, X86_64 and XTENSA processors.
+MIPS, MIPS64, NDS32, PowerPC, SH, Sparc, X86_64 and XTENSA processors.
 
 If you are building an embedded Linux system and you find that
 glibc is eating up too much space, you should consider using
@@ -22,10 +22,10 @@ example, that 12 Terabytes will be Network Attached Storage and
 you plan to burn Linux into the system's firmware...
 
 uClibc-ng is maintained by Waldemar Brodkorb and is licensed under the
-GNU LESSER GENERAL PUBLIC LICENSE.  This license allows you to
+GNU LESSER GENERAL PUBLIC LICENSE. This license allows you to
 make closed source commercial applications using an unmodified
 version of uClibc-ng. You do not need to give away all your source code just
-because you use uClibc-ng and/or run on Linux.  You should, however,
+because you use uClibc-ng and/or run on Linux. You should, however,
 carefuly review the license and make certain you understand and
 abide by it strictly.
 
@@ -42,7 +42,7 @@ Additional information can be found at http://www.uclibc-ng.org/.
 
 uClibc-ng may be freely modified and distributed under the terms of
 the GNU Lesser General Public License, which can be found in the
-file COPYING.
+file COPYING.LIB.
 
 And most of all, be sure to have some fun! :-)
  -Waldemar
diff --git a/Rules.mak b/Rules.mak
index 3e4e6c03c..894d4dc28 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -104,6 +104,7 @@ ifeq ($(TARGET_ARCH),)
 ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
 				  -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
 				  -e s/arm.*/arm/ -e s/sa110/arm/ \
+				  -e s/nds32.*/nds32/ \
 				  -e s/sh.*/sh/ \
 				  -e s/s390x/s390/ -e s/parisc.*/hppa/ \
 				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
@@ -300,6 +301,7 @@ ifeq ($(UCLIBC_HAS_SOFT_FLOAT),y)
 ifneq ($(TARGET_ARCH),bfin)
 ifneq ($(TARGET_ARCH),lm32)
 ifneq ($(TARGET_ARCH),nios2)
+ifneq ($(TARGET_ARCH),nds32)
 ifneq ($(TARGET_ARCH),sh)
 ifneq ($(TARGET_ARCH),c6x)
 ifneq ($(TARGET_ARCH),h8300)
@@ -313,6 +315,7 @@ endif
 endif
 endif
 endif
+endif
 
 $(eval $(call check-gcc-var,-std=gnu99))
 CPU_CFLAGS-y += $(CFLAG_-std=gnu99)
@@ -410,6 +413,12 @@ ifeq ($(TARGET_ARCH),mips)
 	CPU_LDFLAGS-y += $(CPU_CFLAGS)
 endif
 
+ifeq ($(TARGET_ARCH),nds32)
+	CPU_CFLAGS-$(CONFIG_NDS32_ISA)+=-march=nds32
+	CFLAGS-.os+= -DPIC
+	CFLAGS-.oS+= -DPIC
+endif
+
 ifeq ($(TARGET_ARCH),sh)
 $(eval $(call check-gcc-var,-mprefergot))
 	OPTIMIZATION += $(CFLAG_-mprefergot)
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index 4a1509d88..1d97e784e 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -31,6 +31,7 @@ choice
 	default TARGET_metag if DESIRED_TARGET_ARCH = "metag"
 	default TARGET_microblaze if DESIRED_TARGET_ARCH = "microblaze"
 	default TARGET_mips if DESIRED_TARGET_ARCH = "mips"
+	default TARGET_nds32 if DESIRED_TARGET_ARCH = "nds32"
 	default TARGET_nios2 if DESIRED_TARGET_ARCH = "nios2"
 	default TARGET_or1k if DESIRED_TARGET_ARCH = "or1k"
 	default TARGET_powerpc if DESIRED_TARGET_ARCH = "powerpc"
@@ -94,6 +95,9 @@ config TARGET_microblaze
 config TARGET_mips
 	bool "mips"
 
+config TARGET_nds32
+	bool "nds32"
+
 config TARGET_nios2
 	bool "nios2"
 
@@ -172,6 +176,10 @@ if TARGET_metag
 source "extra/Configs/Config.metag"
 endif
 
+if TARGET_nds32
+source "extra/Configs/Config.nds32"
+endif
+
 if TARGET_nios2
 source "extra/Configs/Config.nios2"
 endif
@@ -476,7 +484,6 @@ config LDSO_GNU_HASH_SUPPORT
 
 choice
 	prompt "Thread support"
-	#default UCLIBC_HAS_THREADS_NATIVE if (TARGET_alpha || TARGET_arm || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_sh || TARGET_sh64)
 	default HAS_NO_THREADS
 	help
 	  If you want to compile uClibc with pthread support, then answer Y.
@@ -524,6 +531,7 @@ config UCLIBC_HAS_THREADS_NATIVE
 		   !TARGET_ia64 && \
 		   !TARGET_m68k && \
 		   !TARGET_microblaze && \
+		   !TARGET_nds32 && \
 		   !TARGET_nios2 && \
 		   !TARGET_or1k && \
 		   ARCH_USE_MMU
@@ -2094,7 +2102,7 @@ menu "Security options"
 config UCLIBC_BUILD_PIE
 	bool "Build utilities as ET_DYN/PIE executables"
 	depends on HAVE_SHARED
-	depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc
+	depends on TARGET_arm || TARGET_frv || TARGET_i386 || TARGET_mips || TARGET_powerpc || TARGET_nds32
 	select FORCE_SHAREABLE_TEXT_SEGMENTS
 	help
 	  If you answer Y here, ldd and iconv are built as ET_DYN/PIE
diff --git a/extra/Configs/Config.nds32 b/extra/Configs/Config.nds32
new file mode 100644
index 000000000..a74249947
--- /dev/null
+++ b/extra/Configs/Config.nds32
@@ -0,0 +1,31 @@
+#
+# For a description of the syntax of this configuration file,
+# see extra/config/Kconfig-language.txt
+#
+
+config TARGET_ARCH
+	string
+	default "nds32"
+
+config FORCE_OPTIONS_FOR_ARCH
+	bool
+	default y
+	select ARCH_ANY_ENDIAN
+	select ARCH_HAS_DEPRECATED_SYSCALLS
+	select ARCH_HAS_MMU
+
+choice
+	prompt "MMU Page Size"
+	default CONFIG_NDS32_PAGE_SIZE_4K
+
+config CONFIG_NDS32_PAGE_SIZE_4K
+	bool "4KB"
+	help
+	  Use 4k pagesize.
+
+config CONFIG_NDS32_PAGE_SIZE_8K
+	bool "8KB"
+	help
+	  Use 8k pagesize.
+
+endchoice
diff --git a/include/elf.h b/include/elf.h
index 4a0280b80..17a6143b5 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -264,11 +264,12 @@ typedef struct
 #define EM_CR		103		/* National Semiconductor CompactRISC */
 #define EM_MSP430	105		/* TI msp430 micro controller */
 #define EM_BLACKFIN	106		/* Analog Devices Blackfin */
-#define EM_ALTERA_NIOS2	113	/* Altera Nios II soft-core processor */
+#define EM_ALTERA_NIOS2	113		/* Altera Nios II soft-core processor */
 #define EM_CRX		114		/* National Semiconductor CRX */
 #define EM_TI_C6000	140
+#define EM_NDS32	167		/* Andes Tech NDS32 */
 #define EM_METAG	174		/* Imagination Technologies Meta */
-#define EM_MICROBLAZE	189	/* Xilinx Microblaze */
+#define EM_MICROBLAZE	189		/* Xilinx Microblaze */
 #define EM_ARCV2	195		/* ARCv2 Cores */
 
 /* NEXT FREE NUMBER: Increment this after adding your official arch number */
@@ -2912,6 +2913,174 @@ typedef Elf32_Addr Elf32_Conflict;
 #define R_H8_ABS32A16 127
 #define R_H8_NUM      128
 
+/* NDS32 relocs.  */
+#define R_NDS32_NONE			0
+/* REL relocations */
+#define R_NDS32_16			1
+#define R_NDS32_32			2
+#define R_NDS32_20			3
+#define R_NDS32_9_PCREL			4
+#define R_NDS32_15_PCREL			5
+#define R_NDS32_17_PCREL			6
+#define R_NDS32_25_PCREL			7
+#define R_NDS32_HI20			8
+#define R_NDS32_LO12S3			9
+#define R_NDS32_LO12S2			10
+#define R_NDS32_LO12S1			11
+#define R_NDS32_LO12S0			12
+#define R_NDS32_SDA15S3			13
+#define R_NDS32_SDA15S2			14
+#define R_NDS32_SDA15S1			15
+#define R_NDS32_SDA15S0			16
+#define R_NDS32_GNU_VTINHERIT			17
+#define R_NDS32_GNU_VTENTRY			18
+
+/* RELA relocations */
+#define R_NDS32_16_RELA			19
+#define R_NDS32_32_RELA			20
+#define R_NDS32_20_RELA			21
+#define R_NDS32_9_PCREL_RELA			22
+#define R_NDS32_15_PCREL_RELA			23
+#define R_NDS32_17_PCREL_RELA			24
+#define R_NDS32_25_PCREL_RELA			25
+#define R_NDS32_HI20_RELA			26
+#define R_NDS32_LO12S3_RELA			27
+#define R_NDS32_LO12S2_RELA			28
+#define R_NDS32_LO12S1_RELA			29
+#define R_NDS32_LO12S0_RELA			30
+#define R_NDS32_SDA15S3_RELA			31
+#define R_NDS32_SDA15S2_RELA			32
+#define R_NDS32_SDA15S1_RELA			33
+#define R_NDS32_SDA15S0_RELA			34
+#define R_NDS32_RELA_GNU_VTINHERIT			35
+#define R_NDS32_RELA_GNU_VTENTRY			36
+#define R_NDS32_GOT20			37
+#define R_NDS32_25_PLTREL			38
+#define R_NDS32_COPY			39
+#define R_NDS32_GLOB_DAT			40
+#define R_NDS32_JMP_SLOT			41
+#define R_NDS32_RELATIVE			42
+#define R_NDS32_GOTOFF			43
+#define R_NDS32_GOTPC20			44
+#define R_NDS32_GOT_HI20			45
+#define R_NDS32_GOT_LO12			46
+#define R_NDS32_GOTPC_HI20			47
+#define R_NDS32_GOTPC_LO12			48
+#define R_NDS32_GOTOFF_HI20			49
+#define R_NDS32_GOTOFF_LO12			50
+#define R_NDS32_INSN16			51
+#define R_NDS32_LABEL			52
+#define R_NDS32_LONGCALL1			53
+#define R_NDS32_LONGCALL2			54
+#define R_NDS32_LONGCALL3			55
+#define R_NDS32_LONGJUMP1			56
+#define R_NDS32_LONGJUMP2			57
+#define R_NDS32_LONGJUMP3			58
+#define R_NDS32_LOADSTORE			59
+#define R_NDS32_9_FIXED_RELA			60
+#define R_NDS32_15_FIXED_RELA			61
+#define R_NDS32_17_FIXED_RELA			62
+#define R_NDS32_25_FIXED_RELA			63
+#define R_NDS32_PLTREL_HI20			64
+#define R_NDS32_PLTREL_LO12			65
+#define R_NDS32_PLT_GOTREL_HI20			66
+#define R_NDS32_PLT_GOTREL_LO12			67
+
+/* Processor specific section indices.  These sections do not actually
+   exist.  Symbols with a st_shndx field corresponding to one of these
+   values have a special meaning.  */
+
+/* Small common symbol.  */
+#define SHN_NDS32_SCOMMON	0xff00
+
+/* Processor specific section flags.  */
+
+/* This section contains sufficient relocs to be relaxed.
+   When relaxing, even relocs of branch instructions the assembler could
+   complete must be present because relaxing may cause the branch target to
+   move.  */
+#define SHF_NDS32_CAN_RELAX	0x10000000
+
+/* ----------------------------------------------------------- */
+/* Processor specific flags for the ELF header e_flags field.  */
+/* ----------------------------------------------------------- */
+/* 31   28 27                 8 7   4 3       0  */
+/* ---------------------------------------------- */
+/* | ARCH | CONFUGURAION FIELD | ABI | VERSION | */
+/* ---------------------------------------------- */
+
+/* ----------------------------------------------------------- */
+/* ARCHITECHURE DEFINITION                                     */
+/* ----------------------------------------------------------- */
+/* 4-bit (b31-b28) nds32 architecture field.  */
+/* we can have up to 15 architectures; 0000 is for unknown */
+#define EF_NDS_ARCH            0xF0000000
+/* 0x80000000 is for no 16-bit */
+/* there could be more architectures. but for now, only n1 and n1h */
+#define E_NDS_ARCH_STAR_RESERVED	0x00000000  /* for future extension */
+#define E_NDS_ARCH_STAR_V1_0	         0x10000000
+#define E_NDS_ARCH_STAR_V0_9	         0x90000000	/* old arch */
+
+/* n1 code. */
+#define E_N1_ARCH                E_NDS_ARCH_STAR_V0_9
+/* n1h code. */
+#define E_N1H_ARCH               E_NDS_ARCH_STAR_V1_0
+
+/* ----------------------------------------------------------- */
+/* CONFIGURATION FIELD DEFINITION FOR EACH ARCHITECTURE        */
+/* ----------------------------------------------------------- */
+#define EF_NDS_INST            0x0FFFFF00
+
+/* E_NDS_ARCH_STAR_V1_0 configuration fields */
+
+/* MFUSR rt, PC and correct ISYNC, MSYNC instructions. */
+/* old N1213HC has no such instructions */
+#define E_NDS32_HAS_MFUSR_PC_INST     0x00000100
+/* C/C++ performance extension instructions. */
+#define E_NDS32_HAS_EXT_INST     0x00000200
+/* performance extension set II instructions. */
+#define E_NDS32_HAS_EXT2_INST     0x00000400
+/* Floating point processor instructions. */
+#define E_NDS32_HAS_FPU_INST     0x00000800
+/* audio instructions. */
+#define E_NDS32_HAS_AUDIO_INST     0x00001000
+/* DIV instructions. */
+#define E_NDS32_HAS_DIV_INST     0x00002000
+/* 16-bit instructions. */
+#define E_NDS32_HAS_16BIT_INST     0x00004000
+/* string operation instructions. */
+#define E_NDS32_HAS_STRING_INST        0x00008000
+/* reduced register file */
+#define E_NDS32_HAS_REDUCED_REGS	0x00010000
+/* video instructions */
+#define E_NDS32_HAS_VIDEO_INST     0x00020000
+/* encription instructions */
+#define E_NDS32_HAS_ENCRIPT_INST     0x00040000
+/* Single/Doulbe Precision Floating point processor instructions. */
+#define E_NDS32_HAS_FPU_DP_INST     0x00080000
+/* no MAC instruction used */
+#define E_NDS32_HAS_NO_MAC_INST     0x00100000
+/* L2 cache instruction */
+#define E_NDS32_HAS_L2C_INST    0x00200000
+
+
+/* 4-bit for ABI signature, allow up to 16 ABIs */
+/* 0 is for OLD ABI V0, 1 is for V1, the rest is reserved */
+/* only old N1213HC use V0 */
+/* New ABI is used due to return register is changed to r0 from r5 */
+#define EF_NDS_ABI		0x000000F0
+#define E_NDS_ABI_V0     0x00000000
+#define E_NDS_ABI_V1     0x00000010
+
+/* this flag signifies the version of Andes ELF */
+/* some more information may exist somewhere which is TBD */
+#define EF_NDS32_ELF_VERSION		0x0000000F
+
+/* Andes ELF Version 1.2 and before */
+#define E_NDS32_ELF_VER_1_2			0x0
+/* Andes ELF Version 1.3 and after */
+#define E_NDS32_ELF_VER_1_3			0x1
+
 /* NIOS relocations. */
 #define R_NIOS_NONE				0
 #define R_NIOS_32				1	/* A 32 bit absolute relocation.*/
diff --git a/ldso/ldso/nds32/dl-debug.h b/ldso/ldso/nds32/dl-debug.h
new file mode 100644
index 000000000..ef4c57d91
--- /dev/null
+++ b/ldso/ldso/nds32/dl-debug.h
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+static const char *_dl_reltypes_tab[] =
+{
+  [0]  "R_NDS32_NONE",					"R_NDS32_16",					"R_NDS32_32",					"R_NDS32_20",
+  [4]  "R_NDS32_9_PCREL",				"R_NDS32_15_PCREL",			"R_NDS32_17_PCREL",			"R_NDS32_25_PCREL",
+  [8]  "R_NDS32_HI20",					"R_NDS32_LO12S3",				"R_NDS32_LO12S2",				"R_NDS32_LO12S1",
+  [12] "R_NDS32_LO12S0",				"R_NDS32_SDA15S3",			"R_NDS32_SDA15S2",			"R_NDS32_SDA15S1",
+  [16] "R_NDS32_SDA15S0",				"R_NDS32_GNU_VTINHERIT",	"R_NDS32_GNU_VTENTRY",		"R_NDS32_16_RELA",
+  [20] "R_NDS32_32_RELA"				"R_NDS32_20_RELA",			"R_NDS32_9_PCREL_RELA",		"R_NDS32_15_PCREL_RELA",
+  [24] "R_NDS32_17_PCREL_RELA",		"R_NDS32_25_PCREL_RELA",	"R_NDS32_HI20_RELA",			"R_NDS32_LO12S3_RELA",
+  [28] "R_NDS32_LO12S2_RELA",			"R_NDS32_LO12S1_RELA",		"R_NDS32_LO12S0_RELA",		"R_NDS32_SDA15S3_RELA",
+  [32] "R_NDS32_SDA15S2_RELA",		"R_NDS32_SDA15S1_RELA",		"R_NDS32_SDA15S0_RELA",		"R_NDS32_RELA_GNU_VTINHERIT",
+  [36] "R_NDS32_RELA_GNU_VTENTRY",	"R_NDS32_GOT20",				"R_NDS32_25_PLTREL",			"R_NDS32_COPY",
+  [40] "R_NDS32_GLOB_DAT",				"R_NDS32_JMP_SLOT",			"R_NDS32_RELATIVE",			"R_NDS32_GOTOFF",
+  [44] "R_NDS32_GOTPC20",				"R_NDS32_GOT_HI20",			"R_NDS32_GOT_LO12",			"R_NDS32_GOTPC_HI20",
+  [48] "R_NDS32_GOTPC_LO12",			"R_NDS32_GOTOFF_HI20",		"R_NDS32_GOTOFF_LO12",		"R_NDS32_INSN16",
+  [52] "R_NDS32_LABEL",					"R_NDS32_LONGCALL1",			"R_NDS32_LONGCALL2",			"R_NDS32_LONGCALL3",
+  [56] "R_NDS32_LONGJUMP1",			"R_NDS32_LONGJUMP2",			"R_NDS32_LONGJUMP3",			"R_NDS32_LOADSTORE",
+  [60] "R_NDS32_9_FIXED_RELA",		"R_NDS32_15_FIXED_RELA",	"R_NDS32_17_FIXED_RELA",	"R_NDS32_25_FIXED_RELA",
+  [64] "R_NDS32_PLTREL_HI20",			"R_NDS32_PLTREL_LO12",		"R_NDS32_PLT_GOTREL_HI20",	"R_NDS32_PLT_GOTREL_LO12",
+};
diff --git a/ldso/ldso/nds32/dl-startup.h b/ldso/ldso/nds32/dl-startup.h
new file mode 100644
index 000000000..f700531ca
--- /dev/null
+++ b/ldso/ldso/nds32/dl-startup.h
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Need bootstrap relocations */
+#define ARCH_NEEDS_BOOTSTRAP_RELOCS
+
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+# define STACK_PUSH
+# define STACK_POP
+#else
+# define STACK_PUSH     "addi   $sp,    $sp,    -24"
+# define STACK_POP      "addi   $sp,    $sp,    24"
+#endif
+
+
+#ifdef __NDS32_N1213_43U1H__
+__asm__("\
+	.text\n\
+	.globl 	_start\n\
+	.globl  _dl_start\n\
+	.globl 	_dl_start_user\n\
+    .type	_start,#function\n\
+    .type	_dl_start,#function\n\
+	.type 	_dl_start_user,#function\n\
+	.align	4\n\
+	.pic\n\
+1:\n\
+	ret\n\
+_start:\n\
+	! we are PIC code, so get global offset table\n\
+	jal	1b\n\
+	sethi	$gp, HI20(_GLOBAL_OFFSET_TABLE_)\n\
+	ori		$gp, $gp, LO12(_GLOBAL_OFFSET_TABLE_+4)\n\
+	add		$gp, $lp, $gp\n\
+\n\
+	! at start time, all the args are on the stack\n\
+	addi	$r0,	$sp,	0\n\
+    ! adjust stack\n\
+    !addi    $sp,    $sp,    -24\n\
+	"STACK_PUSH"\n\
+	bal	_dl_start@PLT\n\
+	! save user entry point in r6\n\
+	addi	$r6,	$r0,	0\n\
+    ! adjust sp and reload registers\n\
+    !addi    $sp,    $sp,    24\n\
+	"STACK_POP"\n\
+\n\
+_dl_start_user:\n\
+\n\
+	! See if we were run as a command with the executable file\n\
+	! name as an extra leading argument.\n\
+	! skip these arguments\n\
+	l.w		$r2,	_dl_skip_args@GOTOFF	! args to skip\n\
+	lwi		$r0,	[$sp+0]					! original argc\n\
+	slli	$r1,	$r2,	2				! offset for new sp\n\
+	add		$sp,	$sp,	$r1				! adjust sp to skip args\n\
+	sub		$r0,	$r0,	$r2				! set new argc\n\
+	swi		$r0,	[$sp+0]					! save new argc\n\
+\n\
+	! load address of _dl_fini finalizer function\n\
+	la		$r5, _dl_fini@GOTOFF\n\
+	! jump to the user_s entry point\n\
+	addi	$r15,	$r6,	0\n\
+	jr		$r15\n\
+	.size   _dl_start_user, . - _dl_start_user\n\
+	.previous\n\
+");
+#else
+__asm__("\
+	.text\n\
+	.globl 	_start\n\
+	.globl  _dl_start\n\
+	.globl 	_dl_start_user\n\
+    .type	_start,#function\n\
+    .type	_dl_start,#function\n\
+	.type 	_dl_start_user,#function\n\
+	.align	4\n\
+	.pic\n\
+_start:\n\
+	! we are PIC code, so get global offset table\n\
+	mfusr	$r15, 	$PC \n\
+	sethi	$gp, 	HI20(_GLOBAL_OFFSET_TABLE_ + 4)\n\
+	ori		$gp, 	$gp, LO12(_GLOBAL_OFFSET_TABLE_ + 8)\n\
+	add		$gp, 	$r15, $gp\n\
+\n\
+	! at start time, all the args are on the stack\n\
+	addi	$r0,	$sp,	0\n\
+    ! adjust stack\n\
+    !addi    $sp,    $sp,    -24\n\
+	"STACK_PUSH"\n\
+	bal	_dl_start@PLT\n\
+	! save user entry point in r6\n\
+	addi	$r6,	$r0,	0\n\
+    ! adjust sp and reload registers\n\
+    !addi    $sp,    $sp,    24\n\
+	"STACK_POP"\n\
+\n\
+_dl_start_user:\n\
+	! See if we were run as a command with the executable file\n\
+	! name as an extra leading argument.\n\
+	! skip these arguments\n\
+	l.w		$r2,	_dl_skip_args@GOTOFF	! args to skip\n\
+	lwi		$r0,	[$sp+0]					! original argc\n\
+	slli	$r1,	$r2,	2				! offset for new sp\n\
+	add		$sp,	$sp,	$r1				! adjust sp to skip args\n\
+	sub		$r0,	$r0,	$r2				! set new argc\n\
+	swi		$r0,	[$sp+0]					! save new argc\n\
+\n\
+	! load address of _dl_fini finalizer function\n\
+	la		$r5, _dl_fini@GOTOFF\n\
+	! jump to the user_s entry point\n\
+	jr	$r6\n\
+	.size   _dl_start_user, . - _dl_start_user\n\
+	.previous\n\
+");
+#endif
+
+#define COPY_UNALIGNED_WORD(swp, twp, align) \
+  { \
+    void *__s = (swp), *__t = (twp); \
+    unsigned char *__s1 = __s, *__t1 = __t; \
+    unsigned short *__s2 = __s, *__t2 = __t; \
+    unsigned long *__s4 = __s, *__t4 = __t; \
+    switch ((align)) \
+    { \
+    case 0: \
+      *__t4 = *__s4; \
+      break; \
+    case 2: \
+      *__t2++ = *__s2++; \
+      *__t2 = *__s2; \
+      break; \
+    default: \
+      *__t1++ = *__s1++; \
+      *__t1++ = *__s1++; \
+      *__t1++ = *__s1++; \
+      *__t1 = *__s1; \
+      break; \
+    } \
+  }
+
+/* Get a pointer to the argv array.  On many platforms this can be just
+ * the address if the first argument, on other platforms we need to
+ * do something a little more subtle here.  */
+#define GET_ARGV(ARGVP, ARGS) ARGVP = (((unsigned long*)ARGS)+1)
+
+/* Handle relocation of the symbols in the dynamic loader. */
+static __always_inline
+void PERFORM_BOOTSTRAP_RELOC(ELF_RELOC *rpnt, unsigned long *reloc_addr,
+	unsigned long symbol_addr, unsigned long load_addr, Elf32_Sym *symtab)
+{
+	Elf32_Addr value;
+	switch (ELF32_R_TYPE(rpnt->r_info)) {
+		case R_NDS32_NONE:
+			break;
+		case R_NDS32_32:
+		case R_NDS32_GLOB_DAT:
+		case R_NDS32_JMP_SLOT:
+			*reloc_addr = symbol_addr + rpnt->r_addend;
+			break;
+		case R_NDS32_32_RELA:
+			value = symbol_addr + rpnt->r_addend;
+			COPY_UNALIGNED_WORD (&value, reloc_addr, (int) reloc_addr & 3);
+			break;
+#undef COPY_UNALIGNED_WORD
+		case R_NDS32_RELATIVE:
+			*reloc_addr = load_addr + rpnt->r_addend;
+			break;
+		default:
+			SEND_STDERR("Unsupported relocation type\n");
+			_dl_exit(1);
+	}
+}
diff --git a/ldso/ldso/nds32/dl-syscalls.h b/ldso/ldso/nds32/dl-syscalls.h
new file mode 100644
index 000000000..54b8839d8
--- /dev/null
+++ b/ldso/ldso/nds32/dl-syscalls.h
@@ -0,0 +1,11 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* We can't use the real errno in ldso, since it has not yet
+ * been dynamicly linked in yet. */
+#include "sys/syscall.h"
+extern int _dl_errno;
+#undef __set_errno
+#define __set_errno(X) {(_dl_errno) = (X);}
diff --git a/ldso/ldso/nds32/dl-sysdep.h b/ldso/ldso/nds32/dl-sysdep.h
new file mode 100644
index 000000000..c4a32ca71
--- /dev/null
+++ b/ldso/ldso/nds32/dl-sysdep.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Define this if the system uses RELOCA.  */
+#define ELF_USES_RELOCA
+#include <elf.h>
+/* Initialization sequence for the GOT.  */
+#define INIT_GOT(GOT_BASE,MODULE) \
+{				\
+  GOT_BASE[2] = (unsigned long) _dl_linux_resolve; \
+  GOT_BASE[1] = (unsigned long) MODULE; \
+}
+
+static __inline__ unsigned long nds32_modulus(unsigned long m, unsigned long p)
+{
+	unsigned long i,t,inc;
+	i=p; t=0;
+	while (!(i&(1<<31))) {
+		i<<=1;
+		t++;
+	}
+	t--;
+	for (inc=t;inc>2;inc--) {
+		i=p<<inc;
+		if (i&(1<<31))
+			break;
+		while (m>=i) {
+			m-=i;
+			i<<=1;
+			if (i&(1<<31))
+				break;
+			if (i<p)
+				break;
+		}
+	}
+	while (m>=p) {
+		m-=p;
+	}
+	return m;
+}
+#define do_rem(result, n, base) ((result) = nds32_modulus(n, base))
+
+/* Here we define the magic numbers that this dynamic loader should accept */
+#define MAGIC1 EM_NDS32
+#undef  MAGIC2
+
+/* Used for error messages */
+#define ELF_TARGET "NDS32"
+
+struct elf_resolve;
+unsigned long _dl_linux_resolver(struct elf_resolve * tpnt, int reloc_entry);
+
+/* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
+   PLT entries should not be allowed to define the value.
+   ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
+   of the main executable's symbols, as for a COPY reloc.  */
+#define elf_machine_type_class(type) \
+  ((((type) == R_NDS32_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)	\
+   | (((type) == R_NDS32_COPY) * ELF_RTYPE_CLASS_COPY))
+
+/* Return the link-time address of _DYNAMIC.  Conveniently, this is the
+   first element of the GOT.  We used to use the PIC register to do this
+   without a constant pool reference, but GCC 4.2 will use a pseudo-register
+   for the PIC base, so it may not be in r10.  */
+static __inline__ Elf32_Addr __attribute__ ((unused))
+elf_machine_dynamic (void)
+{
+	Elf32_Addr link_addr;
+	__asm__ ( "l.w %0, _GLOBAL_OFFSET_TABLE_@GOTOFF": "=r" (link_addr) );
+	return link_addr;
+}
+
+/* Return the run-time load address of the shared object.  */
+static __inline__ Elf32_Addr __attribute__ ((unused))
+elf_machine_load_address (void)
+{
+  /* It doesn't matter what variable this is, the reference never makes
+     it to assembly.  We need a dummy reference to some global variable
+     via the GOT to make sure the compiler initialized %ebx in time.  */
+
+	Elf32_Addr addr;
+	__asm__ ("la	%0, _dl_start@GOTOFF\n" : "=r" (addr) );
+	return addr - elf_machine_dynamic();
+}
+
+static __inline__ void
+elf_machine_relative (Elf32_Addr load_off, const Elf32_Addr rel_addr,
+		      Elf32_Word relative_count)
+{
+	 Elf32_Rela * rpnt = (void *) rel_addr;
+	--rpnt;
+	do {
+		Elf32_Addr *const reloc_addr = (void *) (load_off + (++rpnt)->r_offset);
+
+		*reloc_addr = load_off + rpnt->r_addend;
+	} while (--relative_count);
+}
diff --git a/ldso/ldso/nds32/elfinterp.c b/ldso/ldso/nds32/elfinterp.c
new file mode 100644
index 000000000..bf5c901d1
--- /dev/null
+++ b/ldso/ldso/nds32/elfinterp.c
@@ -0,0 +1,315 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* NDS32 ELF shared library loader suppport
+ *
+ * Copyright (C) 2001-2004 Erik Andersen
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. The name of the above contributors may not be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* Program to load an ELF binary on a linux system, and run it.
+   References to symbols in sharable libraries can be resolved by either
+   an ELF sharable library or a linux style of shared library. */
+
+/* Disclaimer:  I have never seen any AT&T source code for SVr4, nor have
+   I ever taken any courses on internals.  This program was developed using
+   information available through the book "UNIX SYSTEM V RELEASE 4,
+   Programmers guide: Ansi C and Programming Support Tools", which did
+   a more than adequate job of explaining everything required to get this
+   working. */
+
+#include "ldso.h"
+
+extern int _dl_linux_resolve(void);
+
+unsigned long _dl_linux_resolver(struct elf_resolve *tpnt, int reloc_entry)
+{
+	int reloc_type;
+	ELF_RELOC *this_reloc;
+	char *strtab;
+	char *symname;
+	Elf32_Sym *symtab;
+	ELF_RELOC *rel_addr;
+	int symtab_index;
+	char *new_addr;
+	char **got_addr;
+	unsigned long instr_addr;
+
+	rel_addr = (ELF_RELOC *) tpnt->dynamic_info[DT_JMPREL];
+
+	this_reloc = rel_addr + reloc_entry/sizeof(ELF_RELOC);
+	reloc_type = ELF32_R_TYPE(this_reloc->r_info);
+	symtab_index = ELF32_R_SYM(this_reloc->r_info);
+
+	symtab = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB];
+	strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+	symname = strtab + symtab[symtab_index].st_name;
+
+	if (unlikely(reloc_type != R_NDS32_JMP_SLOT)) {
+		_dl_dprintf(2, "%s: Incorrect relocation type in jump relocations\n",
+			_dl_progname);
+		_dl_exit(1);
+	}
+
+	/* Address of jump instruction to fix up */
+	instr_addr = ((unsigned long) this_reloc->r_offset +
+		(unsigned long) tpnt->loadaddr);
+	got_addr = (char **) instr_addr;
+
+	/* Get the address of the GOT entry */
+	new_addr = _dl_find_hash(symname, &_dl_loaded_modules->symbol_scope, tpnt,
+			ELF_RTYPE_CLASS_PLT, NULL);
+	if (unlikely(!new_addr)) {
+		_dl_dprintf(2, "%s: can't resolve symbol '%s'\n",
+			_dl_progname, symname);
+		_dl_exit(1);
+	}
+#if defined (__SUPPORT_LD_DEBUG__)
+	if ((unsigned long) got_addr < 0x40000000)
+	{
+		if (_dl_debug_bindings)
+		{
+			_dl_dprintf(_dl_debug_file, "\nresolve function: %s", symname);
+			if (_dl_debug_detail) _dl_dprintf(_dl_debug_file,
+					"\tpatch %x ==> %x @ %x", *got_addr, new_addr, got_addr);
+		}
+	}
+	if (!_dl_debug_nofixups) {
+		*got_addr = new_addr;
+	}
+#else
+	*got_addr = new_addr;
+#endif
+
+	return (unsigned long) new_addr;
+}
+
+static int
+_dl_parse(struct elf_resolve *tpnt, struct r_scope_elem *scope,
+	  unsigned long rel_addr, unsigned long rel_size,
+	  int (*reloc_fnc) (struct elf_resolve *tpnt, struct r_scope_elem *scope,
+			    ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab))
+{
+	int symtab_index;
+	int i;
+	char *strtab;
+	int goof = 0;
+	ElfW(Sym) *symtab;
+	ELF_RELOC *rpnt;
+
+	/* Now parse the relocation information */
+	rpnt = (ELF_RELOC *) rel_addr;
+	rel_size = rel_size / sizeof(ELF_RELOC);
+
+	symtab = (Elf32_Sym *) tpnt->dynamic_info[DT_SYMTAB];
+	strtab = (char *) tpnt->dynamic_info[DT_STRTAB];
+
+	  for (i = 0; i < rel_size; i++, rpnt++) {
+	        int res;
+
+		symtab_index = ELF32_R_SYM(rpnt->r_info);
+
+		debug_sym(symtab,strtab,symtab_index);
+		debug_reloc(symtab,strtab,rpnt);
+
+		res = reloc_fnc (tpnt, scope, rpnt, symtab, strtab);
+
+		if (res==0) continue;
+
+		_dl_dprintf(2, "\n%s: ",_dl_progname);
+
+		if (symtab_index)
+		  _dl_dprintf(2, "symbol '%s': ", strtab + symtab[symtab_index].st_name);
+
+		if (unlikely(res <0))
+		{
+		        int reloc_type = ELF32_R_TYPE(rpnt->r_info);
+#if defined (__SUPPORT_LD_DEBUG__)
+			_dl_dprintf(2, "can't handle reloc type %s\n ", _dl_reltypes(reloc_type));
+#else
+			_dl_dprintf(2, "can't handle reloc type %x\n", reloc_type);
+#endif
+			_dl_exit(-res);
+		}
+		if (unlikely(res >0))
+		{
+			_dl_dprintf(2, "can't resolve symbol\n");
+			goof += res;
+		}
+	  }
+	  return goof;
+}
+
+
+static int
+_dl_do_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
+	      ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+	int reloc_type;
+	int symtab_index;
+	char *symname = NULL;
+	unsigned long *reloc_addr;
+	unsigned long symbol_addr;
+	int goof = 0;
+	struct symbol_ref sym_ref;
+
+	reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
+	reloc_type = ELF32_R_TYPE(rpnt->r_info);
+	symtab_index = ELF32_R_SYM(rpnt->r_info);
+	symbol_addr = 0;
+	sym_ref.sym = &symtab[symtab_index];
+	sym_ref.tpnt = NULL;
+
+	if (symtab_index) {
+		symname = strtab + symtab[symtab_index].st_name;
+		symbol_addr = (unsigned long)_dl_find_hash(symname, scope, tpnt,
+							   elf_machine_type_class(reloc_type), &sym_ref);
+
+		/*
+		 * We want to allow undefined references to weak symbols - this might
+		 * have been intentional.  We should not be linking local symbols
+		 * here, so all bases should be covered.
+		 */
+		if (!symbol_addr && ELF32_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK) {
+			_dl_dprintf (2, "%s: can't resolve symbol '%s'\n",
+				     _dl_progname, strtab + symtab[symtab_index].st_name);
+			_dl_exit (1);
+		}
+	}
+
+#define COPY_UNALIGNED_WORD(swp, twp, align) \
+  { \
+    void *__s = (swp), *__t = (twp); \
+    unsigned char *__s1 = __s, *__t1 = __t; \
+    unsigned short *__s2 = __s, *__t2 = __t; \
+    unsigned long *__s4 = __s, *__t4 = __t; \
+    switch ((align)) \
+    { \
+    case 0: \
+      *__t4 = *__s4; \
+      break; \
+    case 2: \
+      *__t2++ = *__s2++; \
+      *__t2 = *__s2; \
+      break; \
+    default: \
+      *__t1++ = *__s1++; \
+      *__t1++ = *__s1++; \
+      *__t1++ = *__s1++; \
+      *__t1 = *__s1; \
+      break; \
+    } \
+  }
+
+#if defined (__SUPPORT_LD_DEBUG__)
+	{
+		unsigned long old_val = *reloc_addr;
+#endif
+		symbol_addr += rpnt->r_addend ;
+		switch (reloc_type) {
+			case R_NDS32_NONE:
+				break;
+			case R_NDS32_32:
+			case R_NDS32_GLOB_DAT:
+			case R_NDS32_JMP_SLOT:
+				*reloc_addr = symbol_addr;
+				break;
+			case R_NDS32_32_RELA:
+				COPY_UNALIGNED_WORD (&symbol_addr, reloc_addr,(int) reloc_addr & 3);
+				break;
+#undef COPY_UNALIGNED_WORD
+			case R_NDS32_RELATIVE:
+				*reloc_addr = (unsigned long) tpnt->loadaddr + rpnt->r_addend;
+				break;
+			case R_NDS32_COPY:
+				_dl_memcpy((void *) reloc_addr,
+					   (void *) symbol_addr, symtab[symtab_index].st_size);
+				break;
+			default:
+				return -1; /*call _dl_exit(1) */
+		}
+#if defined (__SUPPORT_LD_DEBUG__)
+		if (_dl_debug_reloc && _dl_debug_detail)
+			_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+	}
+
+#endif
+
+	return goof;
+}
+
+static int
+_dl_do_lazy_reloc (struct elf_resolve *tpnt, struct r_scope_elem *scope,
+		   ELF_RELOC *rpnt, ElfW(Sym) *symtab, char *strtab)
+{
+	int reloc_type;
+	unsigned long *reloc_addr;
+
+	reloc_addr = (unsigned long *) (tpnt->loadaddr + (unsigned long) rpnt->r_offset);
+	reloc_type = ELF32_R_TYPE(rpnt->r_info);
+
+#if defined (__SUPPORT_LD_DEBUG__)
+	{
+		unsigned long old_val = *reloc_addr;
+#endif
+		switch (reloc_type) {
+			case R_NDS32_NONE:
+				break;
+			case R_NDS32_JMP_SLOT:
+				*reloc_addr += (unsigned long) tpnt->loadaddr;
+				break;
+			default:
+				return -1; /*call _dl_exit(1) */
+		}
+#if defined (__SUPPORT_LD_DEBUG__)
+		if (_dl_debug_reloc && _dl_debug_detail)
+			_dl_dprintf(_dl_debug_file, "\tpatch: %x ==> %x @ %x", old_val, *reloc_addr, reloc_addr);
+	}
+
+#endif
+	return 0;
+
+}
+
+void
+_dl_parse_lazy_relocation_information(struct dyn_elf *rpnt,
+				      unsigned long rel_addr,
+				      unsigned long rel_size)
+{
+	_dl_parse(rpnt->dyn, NULL, rel_addr, rel_size, _dl_do_lazy_reloc);
+}
+
+int
+_dl_parse_relocation_information(struct dyn_elf *rpnt,
+				 struct r_scope_elem *scope,
+				 unsigned long rel_addr,
+				 unsigned long rel_size)
+{
+	return _dl_parse(rpnt->dyn, scope, rel_addr,
+			 rel_size, _dl_do_reloc);
+}
+
diff --git a/ldso/ldso/nds32/resolve.S b/ldso/ldso/nds32/resolve.S
new file mode 100644
index 000000000..8c53850d7
--- /dev/null
+++ b/ldso/ldso/nds32/resolve.S
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+# define STACK_PUSH
+# define STACK_POP
+#else
+# define STACK_PUSH     addi   $sp,    $sp,    -24
+# define STACK_POP      addi   $sp,    $sp,    24
+#endif
+
+ .text
+ .align 4      ! 16 byte boundary
+ .globl _dl_linux_resolve
+ .type _dl_linux_resolve,#function
+ .pic
+
+_dl_linux_resolve:
+	! we get called with
+	! 	lp contains the return address from this call
+	!	r16 contains offset to target reloc entry
+	!	r17 contains GOT[1] (identity of taget lib)
+	!  ta is GOT[2] (starting address of this function)
+
+	! save arguments r0 - r5 and gp, lp
+	smw.adm	$r0,	[$sp],	$r5,	6
+
+	! init gp
+#ifdef __NDS32_N1213_43U1H__
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	LO12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$ta,	$gp
+#else
+	mfusr	$ta,	$PC
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	LO12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$ta,	$gp
+#endif
+
+	! #ifdef __NDS32_ABI_1__
+	! adjust stack
+	!addi	$sp,	$sp,	-24
+	STACK_PUSH
+	! #endif
+
+	! set arguments
+	addi	$r0,	$r17,	0
+	!addi	$r1,	$r16,	0
+	slli    $r1,    $r16,   2
+	slli    $r16,   $r16,   3
+	add     $r1,    $r1,    $r16
+
+	! comment out profiling argument
+	!addi	$r2,	$lp,	0
+
+	! call fixup routine
+	bal	_dl_linux_resolver@PLT
+
+	! save the return
+	addi	$ta,	$r0,	0
+
+	! #ifdef __NDS32_ABI_1__
+	! adjust sp
+	!addi	$sp,	$sp,	24
+	STACK_POP
+	! #endif
+
+	! reload registers
+	lmw.bim	$r0,	[$sp],	$r5,	6
+
+	! jump to the newly found address
+	jr		$ta
+
+.size _dl_linux_resolve, .-_dl_linux_resolve
diff --git a/libc/string/nds32/Makefile b/libc/string/nds32/Makefile
new file mode 100644
index 000000000..0a95346fd
--- /dev/null
+++ b/libc/string/nds32/Makefile
@@ -0,0 +1,13 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+#
+
+top_srcdir:=../../../
+top_builddir:=../../../
+all: objs
+include $(top_builddir)Rules.mak
+include ../Makefile.in
+include $(top_srcdir)Makerules
diff --git a/libc/string/nds32/memcpy.S b/libc/string/nds32/memcpy.S
new file mode 100644
index 000000000..4f285b5ee
--- /dev/null
+++ b/libc/string/nds32/memcpy.S
@@ -0,0 +1,88 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+!==========================================================
+!  void *memcpy(void *dst, const void *src, int n);
+!
+!        dst: $r0
+!        src: $r1
+!        n  : $r2
+!        ret: $r0 - pointer to the memory area dst.
+!==========================================================
+.weak memcpy
+ENTRY(memcpy)
+	move    $r5, $r0
+	beq     $r0, $r1, .Lquit_memcpy
+	beqz    $r2, .Lquit_memcpy
+	srli	$r3, $r2, #5			! check if len < cache-line size 32
+	beqz	$r3, .Lword_copy_entry
+	andi	$r4, $r0, #0x3			! check byte-align
+	beqz	$r4, .Lunalign_word_copy_entry
+
+	addi    $r4, $r4, #-4
+	abs		$r4, $r4				! check how many un-align byte to copy
+	sub		$r2, $r2, $r4			! update $R2
+
+.Lunalign_byte_copy:
+	lbi.bi	$r3, [$r1], #1
+	addi	$r4, $r4, #-1
+	sbi.bi	$r3, [$r0], #1
+	bnez	$r4, .Lunalign_byte_copy
+	beqz	$r2, .Lquit_memcpy
+
+.Lunalign_word_copy_entry:
+	andi	$r3, $r0, 0x1f			! check cache-line unaligncount
+	beqz	$r3, .Lcache_copy
+
+	addi	$r3, $r3, #-32
+	abs		$r3, $r3
+	sub		$r2, $r2, $r3			! update $R2
+
+.Lunalign_word_copy:
+	lmw.bim	$r4, [$r1], $r4
+	addi	$r3, $r3, #-4
+	smw.bim	$r4, [$r0], $r4
+	bnez	$r3, .Lunalign_word_copy
+	beqz	$r2, .Lquit_memcpy
+
+	addi	$r3, $r2, #-32			! to check $r2 < cache_line, than go to .Lword_copy
+	bltz	$r3, .Lword_copy_entry
+.Lcache_copy:
+	srli	$r3, $r2, #5
+	beqz	$r3, .Lword_copy_entry
+	pushm	$r6, $r13
+.L3:
+	lmw.bim	$r6, [$r1], $r13
+	addi	$r3, $r3, #-1
+	smw.bim	$r6, [$r0], $r13
+	bnez	$r3, .L3
+	popm	$r6, $r13
+
+.Lword_copy_entry:
+	andi	$r2, $r2, #31
+	beqz	$r2, .Lquit_memcpy
+	srli	$r3, $r2, #2
+	beqz	$r3, .Lbyte_copy
+.Lword_copy:
+	lmw.bim	$r4, [$r1], $r4
+	addi	$r3, $r3, #-1
+	smw.bim	$r4, [$r0], $r4
+	bnez	$r3, .Lword_copy
+	andi	$r2, $r2, #3
+	beqz	$r2, .Lquit_memcpy
+
+.Lbyte_copy:
+	lbi.bi	$r3, [$r1], #1
+	addi	$r2, $r2, #-1
+	sbi.bi	$r3, [$r0], #1
+	bnez	$r2, .Lbyte_copy
+
+.Lquit_memcpy:
+	move	$r0, $r5
+	ret
+
+END(memcpy)
+libc_hidden_def(memcpy)
diff --git a/libc/string/nds32/memset.S b/libc/string/nds32/memset.S
new file mode 100644
index 000000000..edd15a410
--- /dev/null
+++ b/libc/string/nds32/memset.S
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*  Copyright (C) 1998, 2003 Free Software Foundation, Inc.
+ *  Contributed by Philip Blundell <philb@gnu.org>
+ *
+ *  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, write to the Free
+ *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ *  02111-1307 USA.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+!==========================================================
+!  void *memset(void *dst, int val, int len);
+!
+!        dst: $r0
+!        val: $r1
+!        len: $r2
+!        ret: $r0 - pointer to the memory area dst.
+!==========================================================
+.weak memset
+ENTRY(memset)
+	move	$r5, $r0	        ! Return value
+	beqz    $r2, .Lend_memset   ! Exit when len = 0
+	srli	$r3, $r2, 2	        ! r3 is how many words to copy
+	andi	$r2, $r2, 3	        ! How many bytes are less than a word
+	beqz	$r3, .Lbyte_set	    ! When n is less than a word
+
+    ! set r1 from to abababab
+	andi    $r1, $r1, 0x00ff        ! r1 = 000000ab
+	slli    $r4, $r1, 8             ! r4 = 0000ab00
+	or      $r1, $r1, $r4           ! r1 = 0000abab
+	slli    $r4, $r1, 16            ! r4 = abab0000
+	or      $r1, $r1, $r4           ! r1 = abababab
+
+.Lword_set:
+	addi	$r3, $r3, -1	        ! How many words left to copy
+	smw.bim $r1, [$r5], $r1	    	! Copy the word to det
+	bnez    $r3, .Lword_set			! Still words to set, continue looping
+	beqz	$r2, .Lend_memset		! No left byte to set
+
+.Lbyte_set:
+	! Less than 4 bytes left to set
+	addi	$r2, $r2, -1		! Decrease len by 1
+	sbi.p	$r1, [$r5], 1		! Set data of the next byte to r1
+	bnez	$r2, .Lbyte_set		! Still bytes left to set
+
+.Lend_memset:
+	ret
+
+END(memset)
+libc_hidden_def(memset)
diff --git a/libc/sysdeps/linux/nds32/Makefile b/libc/sysdeps/linux/nds32/Makefile
new file mode 100644
index 000000000..633c91f3e
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/Makefile
@@ -0,0 +1,13 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+#
+
+top_srcdir=../../../../
+top_builddir=../../../../
+all: objs
+include $(top_builddir)Rules.mak
+include Makefile.arch
+include $(top_srcdir)Makerules
diff --git a/libc/sysdeps/linux/nds32/Makefile.arch b/libc/sysdeps/linux/nds32/Makefile.arch
new file mode 100644
index 000000000..8691875ee
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/Makefile.arch
@@ -0,0 +1,5 @@
+# Copyright (C) 2016 Andes Technology, Inc.
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+
+CSRC-y := brk.c sigaction.c
+SSRC-y := setjmp.S __longjmp.S bsd-setjmp.S bsd-_setjmp.S clone.S mmap.S sigrestorer.S vfork.S sysdep.S syscall.S
diff --git a/libc/sysdeps/linux/nds32/__longjmp.S b/libc/sysdeps/linux/nds32/__longjmp.S
new file mode 100644
index 000000000..fbea6f6f4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/__longjmp.S
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+  setjmp/longjmp for nds32.
+  r0 - r5 are for paramter passing - no need to save
+  r6 - r14 are callee saved - needs to save
+  r15 is temp register for assembler - no need to save
+  r16 - r25 are caller saved - no need to save
+  r26 - r27 are temp registers for OS - no need to save
+  r28 is fp - need to save
+  r29 is gp - need to save
+  r30 is ra - need to save
+  r31 is sp - need to save
+  so we need to save r6 - r14 and r28 - r31
+  The jmpbuf looks like this:
+  r6
+  r7
+  r8
+  r9
+  r10
+  r11
+  r12
+  r13
+  r14
+  fp
+  gp
+  ra
+  sp
+#ifdef NDS32_ABI_2FP_PLUS
+  ($fpcfg.freg)
+  (callee-saved FPU regs)
+#endif
+  reserved(for 8-byte align if needed)
+*/
+
+#include <sysdep.h>
+#define _SETJMP_H
+#define _ASM
+#include <bits/setjmp.h>
+	.section .text
+
+/* __longjmp (env[0].__jmpbuf, val ?: 1);  */
+ENTRY(__longjmp)
+	! restore registers
+	lmw.bim  $r6, [$r0], $r14, #0xf
+
+#ifdef NDS32_ABI_2FP_PLUS
+	lwi.bi	$r20, [$r0], #4	/* Load $fpcfg.freg to $r20.  */
+
+	/* 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.bi	$fd31, [$r0], #8
+	fldi.bi	$fd30, [$r0], #8
+	fldi.bi	$fd29, [$r0], #8
+	fldi.bi	$fd28, [$r0], #8
+	fldi.bi	$fd27, [$r0], #8
+	fldi.bi	$fd26, [$r0], #8
+	fldi.bi	$fd25, [$r0], #8
+	fldi.bi	$fd24, [$r0], #8
+.LCFG2:
+	fldi.bi	$fd10, [$r0], #8
+	fldi.bi	$fd9, [$r0], #8
+	fldi.bi	$fd8, [$r0], #8
+.LCFG1:
+	fldi.bi	$fd7, [$r0], #8
+	fldi.bi	$fd6, [$r0], #8
+	fldi.bi	$fd5, [$r0], #8
+	fldi.bi	$fd4, [$r0], #8
+.LCFG0:
+	fldi.bi	$fd3, [$r0], #8
+#endif /* NDS32_ABI_2FP_PLUS */
+
+
+	! return error code; make sure error code is not 0
+	bnez  $r1, .Ldone
+	movi  $r1, #1
+.Ldone:
+	addi  $r0, $r1, #0
+	ret
+END(__longjmp)
+libc_hidden_def(__longjmp)
diff --git a/libc/sysdeps/linux/nds32/__syscall_error.c b/libc/sysdeps/linux/nds32/__syscall_error.c
new file mode 100644
index 000000000..2aa6903e2
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/__syscall_error.c
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <features.h>
+
+/* This routine is jumped to by all the syscall handlers, to stash
+ * an error number into errno.  */
+int __syscall_error(int err_no) attribute_hidden;
+int __syscall_error(int err_no)
+{
+	__set_errno(err_no);
+	return -1;
+}
diff --git a/libc/sysdeps/linux/nds32/bits/byteswap.h b/libc/sysdeps/linux/nds32/bits/byteswap.h
new file mode 100644
index 000000000..0f43cbb4e
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/byteswap.h
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Macros to swap the order of bytes in integer values.
+   Copyright (C) 1997, 1998, 2000, 2002, 2003, 2006, 2007
+   Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
+# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
+#endif
+
+#ifndef _BITS_BYTESWAP_H
+#define _BITS_BYTESWAP_H 1
+
+/* Swap bytes in 16 bit value.  */
+#define __bswap_constant_16(x) \
+     ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8))
+
+#ifdef __GNUC__
+# if __GNUC__ >= 2
+#  define __bswap_16(x) \
+     (__extension__							      \
+      ({ register unsigned short int __v, __x = (x);			      \
+	 if (__builtin_constant_p (__x))				      \
+	   __v = __bswap_constant_16 (__x);				      \
+	 else								      \
+	   __asm__ ("wsbh	%0, %0\n\t"				  \
+		    : "=r" (__v)					      \
+ 		    : "0" (__x));						  \
+	 __v; }))
+# else
+/* This is better than nothing.  */
+#  define __bswap_16(x) \
+     (__extension__							      \
+      ({ register unsigned short int __x = (x); __bswap_constant_16 (__x); }))
+# endif
+#else
+static __inline unsigned short int
+__bswap_16 (unsigned short int __bsx)
+{
+  return __bswap_constant_16 (__bsx);
+}
+#endif
+
+/* Swap bytes in 32 bit value.  */
+#define __bswap_constant_32(x) \
+     ((((x) & 0xff000000) >> 24) | (((x) & 0x00ff0000) >>  8) |		      \
+      (((x) & 0x0000ff00) <<  8) | (((x) & 0x000000ff) << 24))
+
+#ifdef __GNUC__
+# if __GNUC__ >= 2
+#   define __bswap_32(x) \
+     (__extension__							      \
+      ({ register unsigned int __v, __x = (x);				      \
+	 if (__builtin_constant_p (__x))				      \
+	   __v = __bswap_constant_32 (__x);				      \
+	 else								      \
+	   __asm__ ("wsbh	%0, %0\n\t"		\
+			"rotri	%0, %0, #16\n\t"	\
+			: "=r" (__v)				\
+			: "0" (__x));				\
+	 __v; }))
+# else
+#  define __bswap_32(x) \
+     (__extension__							      \
+      ({ register unsigned int __x = (x); __bswap_constant_32 (__x); }))
+# endif
+#else
+static __inline unsigned int
+__bswap_32 (unsigned int __bsx)
+{
+  return __bswap_constant_32 (__bsx);
+}
+#endif
+
+
+#if defined __GNUC__ && __GNUC__ >= 2
+/* Swap bytes in 64 bit value.  */
+#define __bswap_constant_64(x) \
+     ((((x) & 0xff00000000000000ull) >> 56)				      \
+      | (((x) & 0x00ff000000000000ull) >> 40)				      \
+      | (((x) & 0x0000ff0000000000ull) >> 24)				      \
+      | (((x) & 0x000000ff00000000ull) >> 8)				      \
+      | (((x) & 0x00000000ff000000ull) << 8)				      \
+      | (((x) & 0x0000000000ff0000ull) << 24)				      \
+      | (((x) & 0x000000000000ff00ull) << 40)				      \
+      | (((x) & 0x00000000000000ffull) << 56))
+
+# define __bswap_64(x) \
+     (__extension__							      \
+      ({ union { __extension__ unsigned long long int __ll;		      \
+		 unsigned long int __l[2]; } __w, __r;			      \
+         if (__builtin_constant_p (x))					      \
+	   __r.__ll = __bswap_constant_64 (x);				      \
+	 else								      \
+	   {								      \
+	     __w.__ll = (x);						      \
+	     __r.__l[0] = __bswap_32 (__w.__l[1]);			      \
+	     __r.__l[1] = __bswap_32 (__w.__l[0]);			      \
+	   }								      \
+	 __r.__ll; }))
+#endif
+
+#endif /* _BITS_BYTESWAP_H */
diff --git a/libc/sysdeps/linux/nds32/bits/endian.h b/libc/sysdeps/linux/nds32/bits/endian.h
new file mode 100644
index 000000000..989d752d4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/endian.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif /* _ENDIAN_H  */
+
+#ifdef __NDS32_EB__
+#define __BYTE_ORDER __BIG_ENDIAN
+#else /* ! __NDS32_EB__  */
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif /* ! __NDS32_EB__  */
+
+#define __FLOAT_WORD_ORDER __BYTE_ORDER
diff --git a/libc/sysdeps/linux/nds32/bits/fcntl.h b/libc/sysdeps/linux/nds32/bits/fcntl.h
new file mode 100644
index 000000000..d21c4e03c
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/fcntl.h
@@ -0,0 +1,241 @@
+/* O_*, F_*, FD_* bit values for Linux.
+   Copyright (C) 1995, 1996, 1997, 1998, 2000, 2004, 2007
+   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>
+#ifdef __USE_GNU
+# include <bits/uio.h>
+#endif
+
+
+/* open/fcntl - O_SYNC is only implemented on blocks devices and on files
+   located on an ext2 file system */
+#define O_ACCMODE	   0003
+#define O_RDONLY	     00
+#define O_WRONLY	     01
+#define O_RDWR		     02
+#define O_CREAT		   0100	/* not fcntl */
+#define O_EXCL		   0200	/* not fcntl */
+#define O_NOCTTY	   0400	/* not fcntl */
+#define O_TRUNC		  01000	/* not fcntl */
+#define O_APPEND	  02000
+#define O_NONBLOCK	  04000
+#define O_NDELAY	O_NONBLOCK
+#define O_SYNC		 010000
+#define O_FSYNC		 O_SYNC
+#define O_ASYNC		 020000
+
+#ifdef __USE_GNU
+# define O_DIRECT	 040000	/* Direct disk access.	*/
+# define O_DIRECTORY	0200000	/* Must be a directory.	 */
+# define O_NOFOLLOW	0400000	/* Do not follow links.	 */
+# define O_NOATIME     01000000 /* Do not set atime.  */
+# define O_CLOEXEC     02000000 /* set close_on_exec */
+# define O_PATH       010000000 /* Resolve pathname but do not open file.  */
+#endif
+
+/* For now Linux has synchronisity options for data and read operations.
+   We define the symbols here but let them do the same as O_SYNC since
+   this is a superset.	*/
+#if defined __USE_POSIX199309 || defined __USE_UNIX98
+# define O_DSYNC	O_SYNC	/* Synchronize data.  */
+# define O_RSYNC	O_SYNC	/* Synchronize read operations.	 */
+#endif
+
+#ifdef __USE_LARGEFILE64
+# define O_LARGEFILE	0100000
+#endif
+
+/* Values for the second argument to `fcntl'.  */
+#define F_DUPFD		0	/* Duplicate file descriptor.  */
+#define F_GETFD		1	/* Get file descriptor flags.  */
+#define F_SETFD		2	/* Set file descriptor flags.  */
+#define F_GETFL		3	/* Get file status flags.  */
+#define F_SETFL		4	/* Set file status flags.  */
+#ifndef __USE_FILE_OFFSET64
+# define F_GETLK	5	/* Get record locking info.  */
+# define F_SETLK	6	/* Set record locking info (non-blocking).  */
+# define F_SETLKW	7	/* Set record locking info (blocking).	*/
+#else
+# define F_GETLK	F_GETLK64  /* Get record locking info.	*/
+# define F_SETLK	F_SETLK64  /* Set record locking info (non-blocking).*/
+# define F_SETLKW	F_SETLKW64 /* Set record locking info (blocking).  */
+#endif
+#define F_GETLK64	12	/* Get record locking info.  */
+#define F_SETLK64	13	/* Set record locking info (non-blocking).  */
+#define F_SETLKW64	14	/* Set record locking info (blocking).	*/
+
+#if defined __USE_BSD || defined __USE_UNIX98
+# define F_SETOWN	8	/* Get owner of socket (receiver of SIGIO).  */
+# define F_GETOWN	9	/* Set owner of socket (receiver of SIGIO).  */
+#endif
+
+#ifdef __USE_GNU
+# define F_SETSIG	10	/* Set number of signal to be sent.  */
+# define F_GETSIG	11	/* Get number of signal to be sent.  */
+#endif
+
+#ifdef __USE_GNU
+# define F_SETLEASE	1024	/* Set a lease.	 */
+# define F_GETLEASE	1025	/* Enquire what lease is active.  */
+# define F_NOTIFY	1026	/* Request notfications on a directory.	 */
+# define F_DUPFD_CLOEXEC 1030	/* Duplicate file descriptor with
+				   close-on-exit set on new fd.  */
+# define F_SETPIPE_SZ	1031    /* Set pipe page size array.  */
+# define F_GETPIPE_SZ	1032    /* Get pipe page size array.  */
+#endif
+
+/* For F_[GET|SET]FD.  */
+#define FD_CLOEXEC	1	/* actually anything with low bit set goes */
+
+/* For posix fcntl() and `l_type' field of a `struct flock' for lockf().  */
+#define F_RDLCK		0	/* Read lock.  */
+#define F_WRLCK		1	/* Write lock.	*/
+#define F_UNLCK		2	/* Remove lock.	 */
+
+/* For old implementation of bsd flock().  */
+#define F_EXLCK		4	/* or 3 */
+#define F_SHLCK		8	/* or 4 */
+
+#ifdef __USE_BSD
+/* Operations for bsd flock(), also used by the kernel implementation.	*/
+# define LOCK_SH	1	/* shared lock */
+# define LOCK_EX	2	/* exclusive lock */
+# define LOCK_NB	4	/* or'd with one of the above to prevent
+				   blocking */
+# define LOCK_UN	8	/* remove lock */
+#endif
+
+#ifdef __USE_GNU
+# define LOCK_MAND	32	/* This is a mandatory flock:	*/
+# define LOCK_READ	64	/* ... which allows concurrent read operations.	 */
+# define LOCK_WRITE	128	/* ... which allows concurrent write operations.  */
+# define LOCK_RW	192	/* ... Which allows concurrent read & write operations.	 */
+#endif
+
+#ifdef __USE_GNU
+/* Types of directory notifications that may be requested with F_NOTIFY.  */
+# define DN_ACCESS	0x00000001	/* File accessed.  */
+# define DN_MODIFY	0x00000002	/* File modified.  */
+# define DN_CREATE	0x00000004	/* File created.  */
+# define DN_DELETE	0x00000008	/* File removed.  */
+# define DN_RENAME	0x00000010	/* File renamed.  */
+# define DN_ATTRIB	0x00000020	/* File changed attibutes.  */
+# define DN_MULTISHOT	0x80000000	/* Don't remove notifier.  */
+#endif
+
+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.  */
+  };
+
+#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
+
+/* Define some more compatibility macros to be backward compatible with
+   BSD systems which did not managed to hide these kernel macros.  */
+#ifdef	__USE_BSD
+# define FAPPEND	O_APPEND
+# define FFSYNC		O_FSYNC
+# define FASYNC		O_ASYNC
+# define FNONBLOCK	O_NONBLOCK
+# define FNDELAY	O_NDELAY
+#endif /* Use BSD.  */
+
+/* Advise to `posix_fadvise'.  */
+#ifdef __USE_XOPEN2K
+# define POSIX_FADV_NORMAL	0 /* No further special treatment.  */
+# define POSIX_FADV_RANDOM	1 /* Expect random page references.  */
+# define POSIX_FADV_SEQUENTIAL	2 /* Expect sequential page references.	 */
+# define POSIX_FADV_WILLNEED	3 /* Will need these pages.  */
+# define POSIX_FADV_DONTNEED	4 /* Don't need these pages.  */
+# define POSIX_FADV_NOREUSE	5 /* Data will be accessed once.  */
+#endif
+
+
+#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
+/* Flags for SYNC_FILE_RANGE.  */
+# define SYNC_FILE_RANGE_WAIT_BEFORE	1 /* Wait upon writeout of all pages
+					     in the range before performing the
+					     write.  */
+# define SYNC_FILE_RANGE_WRITE		2 /* Initiate writeout of all those
+					     dirty pages in the range which are
+					     not presently under writeback.  */
+# define SYNC_FILE_RANGE_WAIT_AFTER	4 /* Wait upon writeout of all pages in
+					     the range after performing the
+					     write.  */
+
+/* Flags for SPLICE and VMSPLICE.  */
+# define SPLICE_F_MOVE		1	/* Move pages instead of copying.  */
+# define SPLICE_F_NONBLOCK	2	/* Don't block on the pipe splicing
+					   (but we may still block on the fd
+					   we splice from/to).  */
+# define SPLICE_F_MORE		4	/* Expect more data.  */
+# define SPLICE_F_GIFT		8	/* Pages passed in are a gift.  */
+#endif
+
+__BEGIN_DECLS
+
+#if defined __USE_GNU && defined __UCLIBC_LINUX_SPECIFIC__
+
+/* Provide kernel hint to read ahead.  */
+extern ssize_t readahead (int __fd, __off64_t __offset, size_t __count)
+    __THROW;
+
+
+/* Selective file content synch'ing.  */
+extern int sync_file_range (int __fd, __off64_t __from, __off64_t __to,
+			    unsigned int __flags);
+
+/* Splice address range into a pipe.  */
+extern ssize_t vmsplice (int __fdout, const struct iovec *__iov,
+			 size_t __count, unsigned int __flags);
+
+/* Splice two files together.  */
+extern ssize_t splice (int __fdin, __off64_t *__offin, int __fdout,
+		       __off64_t *__offout, size_t __len,
+		       unsigned int __flags);
+
+/* In-kernel implementation of tee for pipe buffers.  */
+extern ssize_t tee (int __fdin, int __fdout, size_t __len,
+		    unsigned int __flags);
+
+#endif
+__END_DECLS
+
diff --git a/libc/sysdeps/linux/nds32/bits/kernel_stat.h b/libc/sysdeps/linux/nds32/bits/kernel_stat.h
new file mode 100644
index 000000000..9e5c40d15
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/kernel_stat.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _BITS_STAT_STRUCT_H
+#define _BITS_STAT_STRUCT_H
+
+struct kernel_stat {
+#if defined(__NDS32_EB__)
+	unsigned short st_dev;
+	unsigned short __pad1;
+#else
+	unsigned long  st_dev;
+#endif
+	unsigned long  st_ino;
+	unsigned short st_mode;
+	unsigned short st_nlink;
+	unsigned short st_uid;
+	unsigned short st_gid;
+#if defined(__NDS32_EB__)
+	unsigned short st_rdev;
+	unsigned short __pad2;
+#else
+	unsigned long  st_rdev;
+#endif
+	unsigned long  st_size;
+	unsigned long  st_blksize;
+	unsigned long  st_blocks;
+	struct timespec	st_atim;
+	struct timespec	st_mtim;
+	struct timespec	st_ctim;
+	unsigned long  __unused4;
+	unsigned long  __unused5;
+};
+
+struct kernel_stat64 {
+	unsigned long long	st_dev;
+	unsigned long    __pad0;
+#define STAT64_HAS_BROKEN_ST_INO	1
+	unsigned long	__st_ino;
+	unsigned int	st_mode;
+	unsigned int	st_nlink;
+	unsigned long	st_uid;
+	unsigned long	st_gid;
+	unsigned long long	st_rdev;
+	unsigned int    __pad3;
+	unsigned long long	st_size;
+	unsigned long	st_blksize;
+	unsigned long long  st_blocks;	// Number 512-byte blocks allocated. 
+	struct timespec st_atim;	/* Time of last access. */
+	struct timespec st_mtim;	/* Time of last modification. */
+	struct timespec st_ctim;	/* Time of last status change. */
+	unsigned long long	st_ino;
+};
+
+#endif	/*  _BITS_STAT_STRUCT_H */
diff --git a/libc/sysdeps/linux/nds32/bits/kernel_types.h b/libc/sysdeps/linux/nds32/bits/kernel_types.h
new file mode 100644
index 000000000..1b6ae4d1b
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/kernel_types.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef __ARCH_NDS32_POSIX_TYPES_H
+#define __ARCH_NDS32_POSIX_TYPES_H
+
+/*
+ * This file is generally used by user-level software, so you need to
+ * be a little careful about namespace pollution etc.  Also, we cannot
+ * assume GCC is being used.
+ */
+
+typedef unsigned short		__kernel_dev_t;
+typedef unsigned long		__kernel_ino_t;
+typedef unsigned short		__kernel_mode_t;
+typedef unsigned short		__kernel_nlink_t;
+typedef long			__kernel_off_t;
+typedef int			__kernel_pid_t;
+typedef unsigned short		__kernel_ipc_pid_t;
+typedef unsigned short		__kernel_uid_t;
+typedef unsigned short		__kernel_gid_t;
+typedef unsigned int		__kernel_size_t;
+typedef int			__kernel_ssize_t;
+typedef int			__kernel_ptrdiff_t;
+typedef long			__kernel_time_t;
+typedef long			__kernel_suseconds_t;
+typedef long			__kernel_clock_t;
+typedef int			__kernel_daddr_t;
+typedef char *			__kernel_caddr_t;
+typedef unsigned short		__kernel_uid16_t;
+typedef unsigned short		__kernel_gid16_t;
+typedef unsigned int		__kernel_uid32_t;
+typedef unsigned int		__kernel_gid32_t;
+
+typedef unsigned short		__kernel_old_uid_t;
+typedef unsigned short		__kernel_old_gid_t;
+typedef __kernel_dev_t		__kernel_old_dev_t;
+typedef long			__kernel_long_t;
+typedef unsigned long		__kernel_ulong_t;
+__extension__ typedef long long	__kernel_loff_t;
+
+typedef struct {
+#ifdef __USE_ALL
+	int val[2];
+#else
+	int __val[2];
+#endif
+} __kernel_fsid_t;
+
+#endif /* __ARCH_NDS32_POSIX_TYPES_H */
diff --git a/libc/sysdeps/linux/nds32/bits/mathdef.h b/libc/sysdeps/linux/nds32/bits/mathdef.h
new file mode 100644
index 000000000..d0bac450b
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/mathdef.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999, 2000, 2004 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#if !defined _MATH_H && !defined _COMPLEX_H
+# error "Never use <bits/mathdef.h> directly; include <math.h> instead"
+#endif
+
+#if defined  __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
+# define _MATH_H_MATHDEF	1
+
+/* GCC does not promote `float' values to `double'.  */
+typedef float float_t;		/* `float' expressions are evaluated as
+				   `float'.  */
+typedef double double_t;	/* `double' expressions are evaluated as
+				   `double'.  */
+
+/* The values returned by `ilogb' for 0 and NaN respectively.  */
+# define FP_ILOGB0	(-2147483647)
+# define FP_ILOGBNAN	(2147483647)
+
+#endif	/* ISO C99 */
diff --git a/libc/sysdeps/linux/nds32/bits/mman.h b/libc/sysdeps/linux/nds32/bits/mman.h
new file mode 100644
index 000000000..13f3e60b3
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/mman.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Definitions for POSIX memory map interface.  Linux/NDS32 version.
+   Copyright (C) 1997, 2000, 2003, 2004 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_MMAN_H
+# error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
+#endif
+
+/* The following definitions basically come from the kernel headers.
+   But the kernel header is not namespace clean.  */
+
+
+/* Protections are chosen from these bits, OR'd together.  The
+   implementation does not necessarily support PROT_EXEC or PROT_WRITE
+   without PROT_READ.  The only guarantees are that no writing will be
+   allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
+
+#define PROT_READ	0x1		/* Page can be read.  */
+#define PROT_WRITE	0x2		/* Page can be written.  */
+#define PROT_EXEC	0x4		/* Page can be executed.  */
+#define PROT_NONE	0x0		/* Page can not be accessed.  */
+#define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
+					   growsdown vma (mprotect only).  */
+#define PROT_GROWSUP	0x02000000	/* Extend change to start of
+					   growsup vma (mprotect only).  */
+
+/* Sharing types (must choose one and only one of these).  */
+#define MAP_SHARED	0x01		/* Share changes.  */
+#define MAP_PRIVATE	0x02		/* Changes are private.  */
+#ifdef __USE_MISC
+# define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
+#endif
+
+/* Other flags.  */
+#define MAP_FIXED	0x10		/* Interpret addr exactly.  */
+#ifdef __USE_MISC
+# define MAP_FILE	0x00
+# define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
+# define MAP_ANON	MAP_ANONYMOUS
+# define MAP_RENAME	MAP_ANONYMOUS
+#endif
+
+/* These are Linux-specific.  */
+#ifdef __USE_MISC
+# define MAP_GROWSDOWN	0x0100		/* stack-like segment */
+# define MAP_DENYWRITE	0x0800		/* ETXTBSY */
+# define MAP_EXECUTABLE	0x1000		/* mark it as an executable */
+# define MAP_LOCKED	0x2000		/* pages are locked */
+# define MAP_NORESERVE  0x4000          /* don't check for reservations */
+# define MAP_POPULATE   0x08000         /* populate (prefault) pagetables */
+# define MAP_NONBLOCK   0x10000         /* do not block on IO */
+# define MAP_UNINITIALIZED 0x4000000    /* For anonymous mmap, memory could
+					   be uninitialized. */
+#endif
+
+/* Flags to `msync'.  */
+#define MS_ASYNC	1		/* Sync memory asynchronously.  */
+#define MS_INVALIDATE	2		/* Invalidate the caches.  */
+#define MS_SYNC		4		/* Synchronous memory sync.  */
+
+/* Flags for `mlockall'.  */
+#define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
+#define MCL_FUTURE	2		/* Lock all additions to address
+					   space.  */
+
+/* Advice to `madvise'.  */
+#ifdef __USE_BSD
+#define MADV_NORMAL	0		/* default page-in behavior */
+#define MADV_RANDOM	1		/* page-in minimum required */
+#define MADV_SEQUENTIAL	2		/* read-ahead aggressively */
+#define MADV_WILLNEED	3		/* pre-fault pages */
+#define MADV_DONTNEED	4		/* discard these pages */
+#endif
+
+/* The POSIX people had to invent similar names for the same things.  */
+#ifdef __USE_XOPEN2K
+# define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
+# define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
+# define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
+# define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
+# define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
+#endif
+
+/* Flags for `mremap'.  */
+#ifdef __USE_GNU
+# define MREMAP_MAYMOVE	1
+#endif
diff --git a/libc/sysdeps/linux/nds32/bits/setjmp.h b/libc/sysdeps/linux/nds32/bits/setjmp.h
new file mode 100644
index 000000000..92d89003a
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/setjmp.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+/* Define the machine-dependent type `jmp_buf'.  NDS32 version. */
+#ifndef _BITS_SETJMP_H
+#define _BITS_SETJMP_H  1
+
+#ifndef _SETJMP_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+#ifndef _ASM
+typedef struct
+  {
+    /* Callee-saved registers r6 - r14, r16 - r19 and r28 - r31.  */
+    int __regs[31];
+
+    /* Program counter.  */
+    void * __pc;
+  } __jmp_buf[1];
+#endif
+
+#endif  /* bits/setjmp.h */
diff --git a/libc/sysdeps/linux/nds32/bits/shm.h b/libc/sysdeps/linux/nds32/bits/shm.h
new file mode 100644
index 000000000..51e1ece7f
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/shm.h
@@ -0,0 +1,106 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1995,1996,1997,2000,2002,2004 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_SHM_H
+# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
+#endif
+
+#include <bits/types.h>
+
+/* Permission flag for shmget.  */
+#define SHM_R		0400		/* or S_IRUGO from <linux/stat.h> */
+#define SHM_W		0200		/* or S_IWUGO from <linux/stat.h> */
+
+/* Flags for `shmat'.  */
+#define SHM_RDONLY	010000		/* attach read-only else read-write */
+#define SHM_RND		020000		/* round attach address to SHMLBA */
+#define SHM_REMAP	040000		/* take-over region on attach */
+
+/* Commands for `shmctl'.  */
+#define SHM_LOCK	11		/* lock segment (root only) */
+#define SHM_UNLOCK	12		/* unlock segment (root only) */
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple.  */
+#define SHMLBA		0x4000
+extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+
+
+/* Type to count number of attaches.  */
+typedef unsigned long int shmatt_t;
+
+/* Data structure describing a set of semaphores.  */
+struct shmid_ds
+  {
+    struct ipc_perm shm_perm;		/* operation permission struct */
+    size_t shm_segsz;			/* size of segment in bytes */
+    __time_t shm_atime;			/* time of last shmat() */
+    unsigned long int __unused1;
+    __time_t shm_dtime;			/* time of last shmdt() */
+    unsigned long int __unused2;
+    __time_t shm_ctime;			/* time of last change by shmctl() */
+    unsigned long int __unused3;
+    __pid_t shm_cpid;			/* pid of creator */
+    __pid_t shm_lpid;			/* pid of last shmop */
+    shmatt_t shm_nattch;		/* number of current attaches */
+    unsigned long int __unused4;
+    unsigned long int __unused5;
+  };
+
+#ifdef __USE_MISC
+
+/* ipcs ctl commands */
+# define SHM_STAT 	13
+# define SHM_INFO 	14
+
+/* shm_mode upper byte flags */
+# define SHM_DEST	01000	/* segment will be destroyed on last detach */
+# define SHM_LOCKED	02000   /* segment will not be swapped */
+# define SHM_HUGETLB	04000	/* segment is mapped via hugetlb */
+
+struct	shminfo
+  {
+    unsigned long int shmmax;
+    unsigned long int shmmin;
+    unsigned long int shmmni;
+    unsigned long int shmseg;
+    unsigned long int shmall;
+    unsigned long int __unused1;
+    unsigned long int __unused2;
+    unsigned long int __unused3;
+    unsigned long int __unused4;
+  };
+
+struct shm_info
+  {
+    int used_ids;
+    unsigned long int shm_tot;	/* total allocated shm */
+    unsigned long int shm_rss;	/* total resident shm */
+    unsigned long int shm_swp;	/* total swapped shm */
+    unsigned long int swap_attempts;
+    unsigned long int swap_successes;
+  };
+
+#endif /* __USE_MISC */
+
+__END_DECLS
diff --git a/libc/sysdeps/linux/nds32/bits/sigcontext.h b/libc/sysdeps/linux/nds32/bits/sigcontext.h
new file mode 100644
index 000000000..759b85df1
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/sigcontext.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _BITS_SIGCONTEXT_H
+#define _BITS_SIGCONTEXT_H 1
+
+#ifndef sigcontext_struct
+#define sigcontext_struct sigcontext
+
+struct sigcontext{
+        unsigned long trap_no;
+        unsigned long error_code;
+        unsigned long oldmask;
+        unsigned long nds32_r0;
+        unsigned long nds32_r1;
+        unsigned long nds32_r2;
+        unsigned long nds32_r3;
+        unsigned long nds32_r4;
+        unsigned long nds32_r5;
+        unsigned long nds32_r6;
+        unsigned long nds32_r7;
+        unsigned long nds32_r8;
+        unsigned long nds32_r9;
+        unsigned long nds32_r10;
+        unsigned long nds32_r11;
+        unsigned long nds32_r12;
+        unsigned long nds32_r13;
+        unsigned long nds32_r14;
+        unsigned long nds32_r15;
+        unsigned long nds32_r16;
+        unsigned long nds32_r17;
+        unsigned long nds32_r18;
+        unsigned long nds32_r19;
+	unsigned long nds32_r20;
+	unsigned long nds32_r21;
+	unsigned long nds32_r22;
+	unsigned long nds32_r23;
+	unsigned long nds32_r24;
+	unsigned long nds32_r25;
+        unsigned long nds32_fp;   //r28
+        unsigned long nds32_gp;   //r29
+        unsigned long nds32_lr;   //r30
+        unsigned long nds32_sp;   //r31
+        unsigned long nds32_d1lo;
+        unsigned long nds32_d1hi;
+        unsigned long nds32_d0lo;
+        unsigned long nds32_d0hi;
+        unsigned long nds32_ipsw;
+        unsigned long nds32_ipc;
+        unsigned long fault_address;
+};
+
+#define sc_pc  nds32_ipc /* For sysdeps/generic/profil-counter.h.  */
+
+#endif /* sigcontext_struct  */
+
+#endif /* _BITS_SIGCONTEXT_H  */
diff --git a/libc/sysdeps/linux/nds32/bits/stackinfo.h b/libc/sysdeps/linux/nds32/bits/stackinfo.h
new file mode 100644
index 000000000..b6f851a28
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/stackinfo.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 2001 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+/* This file contains a bit of information about the stack allocation
+   of the processor.  */
+
+#ifndef _STACKINFO_H
+#define _STACKINFO_H 1
+
+#define _STACK_GROWS_DOWN 1
+
+#endif	/* _STACKINFO_H  */
diff --git a/libc/sysdeps/linux/nds32/bits/stat.h b/libc/sysdeps/linux/nds32/bits/stat.h
new file mode 100644
index 000000000..fe25292cb
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/stat.h
@@ -0,0 +1,172 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1992, 1995-2001, 2002 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_STAT_H
+# error "Never include <bits/stat.h> directly; use <sys/stat.h> instead."
+#endif
+
+/* Versions of the `struct stat' data structure.  */
+#define _STAT_VER_LINUX_OLD	1
+#define _STAT_VER_KERNEL	1
+#define _STAT_VER_SVR4		2
+#define _STAT_VER_LINUX		3
+#define _STAT_VER		_STAT_VER_LINUX	/* The one defined below.  */
+
+/* Versions of the `xmknod' interface.  */
+#define _MKNOD_VER_LINUX	1
+#define _MKNOD_VER_SVR4		2
+#define _MKNOD_VER		_MKNOD_VER_LINUX /* The bits defined below.  */
+
+
+struct stat
+  {
+    __dev_t st_dev;			/* Device.  */
+    unsigned short int __pad1;
+#ifndef __USE_FILE_OFFSET64
+    __ino_t st_ino;			/* File serial number.	*/
+#else
+    __ino_t __st_ino;			/* 32bit file serial number.	*/
+#endif
+    __mode_t st_mode;			/* File mode.  */
+    __nlink_t st_nlink;			/* Link count.  */
+    __uid_t st_uid;			/* User ID of the file's owner.	*/
+    __gid_t st_gid;			/* Group ID of the file's group.*/
+    __dev_t st_rdev;			/* Device number, if device.  */
+    unsigned short int __pad2;
+#ifndef __USE_FILE_OFFSET64
+    __off_t st_size;			/* Size of file, in bytes.  */
+#else
+    __off64_t st_size;			/* Size of file, in bytes.  */
+#endif
+    __blksize_t st_blksize;		/* Optimal block size for I/O.  */
+
+#ifndef __USE_FILE_OFFSET64
+    __blkcnt_t st_blocks;		/* Number 512-byte blocks allocated. */
+#else
+    __blkcnt64_t st_blocks;		/* Number 512-byte blocks allocated. */
+#endif
+#ifdef __USE_MISC
+    /* Nanosecond resolution timestamps are stored in a format
+       equivalent to 'struct timespec'.  This is the type used
+       whenever possible but the Unix namespace rules do not allow the
+       identifier 'timespec' to appear in the <sys/stat.h> header.
+       Therefore we have to handle the use of this header in strictly
+       standard-compliant sources special.  */
+    struct timespec st_atim;		/* Time of last access.  */
+    struct timespec st_mtim;		/* Time of last modification.  */
+    struct timespec st_ctim;		/* Time of last status change.  */
+# define st_atime st_atim.tv_sec	/* Backward compatibility.  */
+# define st_mtime st_mtim.tv_sec
+# define st_ctime st_ctim.tv_sec
+#else
+    __time_t st_atime;			/* Time of last access.  */
+    unsigned long int st_atimensec;	/* Nscecs of last access.  */
+    __time_t st_mtime;			/* Time of last modification.  */
+    unsigned long int st_mtimensec;	/* Nsecs of last modification.  */
+    __time_t st_ctime;			/* Time of last status change.  */
+    unsigned long int st_ctimensec;	/* Nsecs of last status change.  */
+#endif
+#ifndef __USE_FILE_OFFSET64
+    unsigned long int __unused4;
+    unsigned long int __unused5;
+#else
+    __ino64_t st_ino;			/* File serial number.	*/
+#endif
+  };
+
+#ifdef __USE_LARGEFILE64
+struct stat64
+  {
+    __dev_t st_dev;			/* Device.  */
+    unsigned int __pad1;
+
+    __ino_t __st_ino;			/* 32bit file serial number.	*/
+    __mode_t st_mode;			/* File mode.  */
+    __nlink_t st_nlink;			/* Link count.  */
+    __uid_t st_uid;			/* User ID of the file's owner.	*/
+    __gid_t st_gid;			/* Group ID of the file's group.*/
+    __dev_t st_rdev;			/* Device number, if device.  */
+    unsigned int __pad2;
+    __off64_t st_size;			/* Size of file, in bytes.  */
+    __blksize_t st_blksize;		/* Optimal block size for I/O.  */
+
+    __blkcnt64_t st_blocks;		/* Number 512-byte blocks allocated. */
+#ifdef __USE_MISC
+    /* Nanosecond resolution timestamps are stored in a format
+       equivalent to 'struct timespec'.  This is the type used
+       whenever possible but the Unix namespace rules do not allow the
+       identifier 'timespec' to appear in the <sys/stat.h> header.
+       Therefore we have to handle the use of this header in strictly
+       standard-compliant sources special.  */
+    struct timespec st_atim;		/* Time of last access.  */
+    struct timespec st_mtim;		/* Time of last modification.  */
+    struct timespec st_ctim;		/* Time of last status change.  */
+#else
+    __time_t st_atime;			/* Time of last access.  */
+    unsigned long int st_atimensec;	/* Nscecs of last access.  */
+    __time_t st_mtime;			/* Time of last modification.  */
+    unsigned long int st_mtimensec;	/* Nsecs of last modification.  */
+    __time_t st_ctime;			/* Time of last status change.  */
+    unsigned long int st_ctimensec;	/* Nsecs of last status change.  */
+#endif
+    __ino64_t st_ino;			/* File serial number.		*/
+  };
+#endif
+
+/* Tell code we have these members.  */
+#define	_STATBUF_ST_BLKSIZE
+#define _STATBUF_ST_RDEV
+/* Nanosecond resolution time values are supported.  */
+#define _STATBUF_ST_NSEC
+
+/* Encoding of the file mode.  */
+
+#define	__S_IFMT	0170000	/* These bits determine file type.  */
+
+/* File types.  */
+#define	__S_IFDIR	0040000	/* Directory.  */
+#define	__S_IFCHR	0020000	/* Character device.  */
+#define	__S_IFBLK	0060000	/* Block device.  */
+#define	__S_IFREG	0100000	/* Regular file.  */
+#define	__S_IFIFO	0010000	/* FIFO.  */
+#define	__S_IFLNK	0120000	/* Symbolic link.  */
+#define	__S_IFSOCK	0140000	/* Socket.  */
+
+/* POSIX.1b objects.  Note that these macros always evaluate to zero.  But
+   they do it by enforcing the correct use of the macros.  */
+#define __S_TYPEISMQ(buf)  ((buf)->st_mode - (buf)->st_mode)
+#define __S_TYPEISSEM(buf) ((buf)->st_mode - (buf)->st_mode)
+#define __S_TYPEISSHM(buf) ((buf)->st_mode - (buf)->st_mode)
+
+/* Protection bits.  */
+
+#define	__S_ISUID	04000	/* Set user ID on execution.  */
+#define	__S_ISGID	02000	/* Set group ID on execution.  */
+#define	__S_ISVTX	01000	/* Save swapped text after use (sticky).  */
+#define	__S_IREAD	0400	/* Read by owner.  */
+#define	__S_IWRITE	0200	/* Write by owner.  */
+#define	__S_IEXEC	0100	/* Execute by owner.  */
+
+#ifdef __USE_ATFILE
+# define UTIME_NOW	((1l << 30) - 1l)
+# define UTIME_OMIT	((1l << 30) - 2l)
+#endif
diff --git a/libc/sysdeps/linux/nds32/bits/syscalls.h b/libc/sysdeps/linux/nds32/bits/syscalls.h
new file mode 100644
index 000000000..f69ad4c41
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/syscalls.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _BITS_SYSCALLS_H
+#define _BITS_SYSCALLS_H
+#ifndef _SYSCALL_H
+# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
+#endif
+
+#ifndef __ASSEMBLER__
+#include <errno.h>
+
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err) ((unsigned int) (val) >= 0xfffff001u)
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err)	(-(val))
+
+#define X(x) #x
+#define Y(x) X(x)
+
+#define __issue_syscall(syscall_name)                   \
+"       syscall  "  Y(syscall_name) ";                    \n"
+
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...)	\
+(__extension__ 						\
+({							\
+	register long __result __asm__("$r0");		\
+	register long _sys_num __asm__("$r8");		\
+							\
+	LOAD_ARGS_##nr (name, args)			\
+        _sys_num = (name);				\
+							\
+        __asm__ volatile (				\
+		__issue_syscall (name)                  \
+		: "=r" (__result)			\
+		: "r"(_sys_num) ASM_ARGS_##nr		\
+		: "$lp", "memory");			\
+	__result;					\
+}) \
+)
+
+/* Macros for setting up inline __asm__ input regs */
+#define ASM_ARGS_0
+#define ASM_ARGS_1	ASM_ARGS_0, "r" (__result)
+#define ASM_ARGS_2	ASM_ARGS_1, "r" (_arg2)
+#define ASM_ARGS_3	ASM_ARGS_2, "r" (_arg3)
+#define ASM_ARGS_4	ASM_ARGS_3, "r" (_arg4)
+#define ASM_ARGS_5	ASM_ARGS_4, "r" (_arg5)
+#define ASM_ARGS_6	ASM_ARGS_5, "r" (_arg6)
+#define ASM_ARGS_7	ASM_ARGS_6, "r" (_arg7)
+
+/* Macros for converting sys-call wrapper args into sys call args */
+#define LOAD_ARGS_0(name, arg)					\
+	_sys_num = (long) (name);				\
+
+#define LOAD_ARGS_1(name, arg1)					\
+	__result = (long) (arg1);					\
+	LOAD_ARGS_0 (name, arg1)
+
+/*
+ * Note that the use of _tmpX might look superflous, however it is needed
+ * to ensure that register variables are not clobbered if arg happens to be
+ * a function call itself. e.g. sched_setaffinity() calling getpid() for arg2
+ *
+ * Also this specific order of recursive calling is important to segregate
+ * the tmp args evaluation (function call case described above) and assigment
+ * of register variables
+ */
+#define LOAD_ARGS_2(name, arg1, arg2)				\
+	long _tmp2 = (long) (arg2);				\
+	LOAD_ARGS_1 (name, arg1)				\
+	register long _arg2 __asm__ ("$r1") = _tmp2;
+
+#define LOAD_ARGS_3(name, arg1, arg2, arg3)			\
+	long _tmp3 = (long) (arg3);				\
+	LOAD_ARGS_2 (name, arg1, arg2)				\
+	register long _arg3 __asm__ ("$r2") = _tmp3;
+
+#define LOAD_ARGS_4(name, arg1, arg2, arg3, arg4)		\
+	long _tmp4 = (long) (arg4);				\
+	LOAD_ARGS_3 (name, arg1, arg2, arg3)			\
+	register long _arg4 __asm__ ("$r3") = _tmp4;
+
+#define LOAD_ARGS_5(name, arg1, arg2, arg3, arg4, arg5)		\
+	long _tmp5 = (long) (arg5);				\
+	LOAD_ARGS_4 (name, arg1, arg2, arg3, arg4)		\
+	register long _arg5 __asm__ ("$r4") = _tmp5;
+
+#define LOAD_ARGS_6(name,  arg1, arg2, arg3, arg4, arg5, arg6)	\
+	long _tmp6 = (long) (arg6);				\
+	LOAD_ARGS_5 (name, arg1, arg2, arg3, arg4, arg5)	\
+	register long _arg6 __asm__ ("$r5") = _tmp6;
+
+#define LOAD_ARGS_7(name, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
+	long _tmp7 = (long) (arg7);				\
+	LOAD_ARGS_6 (name, arg1, arg2, arg3, arg4, arg5, arg6)	\
+	register long _arg7 __asm__ ("$r6") = _tmp7;
+
+#endif /* ! __ASSEMBLER__  */
+#endif /* _BITS_SYSCALLS_H */
diff --git a/libc/sysdeps/linux/nds32/bits/uClibc_arch_features.h b/libc/sysdeps/linux/nds32/bits/uClibc_arch_features.h
new file mode 100644
index 000000000..12e4af9cd
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/uClibc_arch_features.h
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+ * Track misc arch-specific features that aren't config options
+ */
+
+#ifndef _BITS_UCLIBC_ARCH_FEATURES_H
+#define _BITS_UCLIBC_ARCH_FEATURES_H
+
+/* instruction used when calling abort() to kill yourself */
+#undef __UCLIBC_ABORT_INSTRUCTION__
+
+/* does your target align 64bit values in register pairs ? (32bit arches only) */
+#define __UCLIBC_SYSCALL_ALIGN_64BIT__
+
+/* does your target have a broken create_module() ? */
+#undef __UCLIBC_BROKEN_CREATE_MODULE__
+
+/* does your target have to worry about older [gs]etrlimit() ? */
+#undef __UCLIBC_HANDLE_OLDER_RLIMIT__
+
+/* does your target have an asm .set ? */
+#define __UCLIBC_HAVE_ASM_SET_DIRECTIVE__
+
+/* define if target supports .weak */
+#define __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
+
+/* define if target supports .weakext */
+#undef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
+
+/* define if target supports IEEE signed zero floats */
+#define __UCLIBC_HAVE_SIGNED_ZERO__
+
+#endif /* _BITS_UCLIBC_ARCH_FEATURES_H */
diff --git a/libc/sysdeps/linux/nds32/bits/uClibc_page.h b/libc/sysdeps/linux/nds32/bits/uClibc_page.h
new file mode 100644
index 000000000..0438493db
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/uClibc_page.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _UCLIBC_PAGE_H
+#define _UCLIBC_PAGE_H
+
+/*
+ * Linux/NDS32 supports 4k and 8k pages (build time).
+ *
+ * Although uClibc determines page size dynamically from kernel's auxv
+ * still the generic code needs a fall back
+ *  _dl_pagesize = auxvt[AT_PAGESZ].a_un.a_val ? : PAGE_SIZE
+ */
+
+#include <features.h>
+
+#if defined(__CONFIG_NDS32_PAGE_SIZE_8K__)
+#define PAGE_SHIFT		13
+#else
+#define PAGE_SHIFT		12
+#endif
+
+#define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#define PAGE_MASK	(~(PAGE_SIZE-1))
+
+/* TBD: fix this with runtime value for a PAGE_SIZE agnostic uClibc */
+#define MMAP2_PAGE_SHIFT PAGE_SHIFT
+
+#endif /* _UCLIBC_PAGE_H */
diff --git a/libc/sysdeps/linux/nds32/bits/wordsize.h b/libc/sysdeps/linux/nds32/bits/wordsize.h
new file mode 100644
index 000000000..32301a0b8
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bits/wordsize.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#define __WORDSIZE	32
diff --git a/libc/sysdeps/linux/nds32/brk.c b/libc/sysdeps/linux/nds32/brk.c
new file mode 100644
index 000000000..a3c38d9b8
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/brk.c
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* brk system call for Linux/NDS32.
+   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/* This must be initialized data because commons can't have aliases.  */
+void *__curbrk attribute_hidden = 0;
+
+libc_hidden_proto(brk)
+int
+brk (void *addr)
+{
+  void *newbrk;
+
+#ifdef NDS32_ABI_V0
+  __asm__ __volatile__ ("move       $r0, %1      \n\t"   // save the argment in r0
+                        "pushm	    $r7, $r8     \n\t"
+			"sethi 	    $r7, hi20(%2)\n\t"   // put the syscall number in r7
+			"ori   	    $r7, $r7, lo12(%2)\n\t"
+			"syscall    0x7fff       \n\t"   // do the system call
+			"popm	    $r7, $r8     \n\t"
+                        "move       %0, $r5      \n\t"   // keep the return value
+                        : "=r"(newbrk)
+                        : "r"(addr), "i"(SYS_ify(brk))
+                        : "$r0", "$r5");
+#else
+  __asm__ __volatile__ ("move       $r0, %1      \n\t"   // save the argment in r0
+			"syscall    %2       \n\t"   	 // do the system call
+                        "move       %0, $r0      \n\t"   // keep the return value
+                        : "=r"(newbrk)
+                        : "r"(addr), "i"(SYS_ify(brk))
+                        : "$r0");
+#endif
+
+  __curbrk = newbrk;
+
+  if (newbrk < addr)
+    {
+      __set_errno (ENOMEM);
+      return -1;
+    }
+
+  return 0;
+}
+libc_hidden_def(brk)
diff --git a/libc/sysdeps/linux/nds32/bsd-_setjmp.S b/libc/sysdeps/linux/nds32/bsd-_setjmp.S
new file mode 100644
index 000000000..a7ab1c731
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bsd-_setjmp.S
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* This just does a tail-call to `__sigsetjmp (ARG, 0)'.
+   We cannot do it in C because it must be a tail-call, so frame-unwinding
+   in setjmp doesn't clobber the state restored by longjmp.  */
+
+#include <sysdep.h>
+
+ENTRY(_setjmp)
+	move	$r1, #0
+
+/* Make a tail call to __sigsetjmp.  */
+#ifdef PIC
+	/* Initialize $r2 as $gp value.  */
+	sethi   $r2, hi20(_GLOBAL_OFFSET_TABLE_-8)
+	ori     $r2, $r2, lo12(_GLOBAL_OFFSET_TABLE_-4)
+	mfusr   $r15, $pc
+	add     $r2, $r15, $r2
+
+	! la    $r3, __sigsetjmp@PLT
+	sethi   $r3, hi20(__sigsetjmp@PLT)
+	ori     $r3, $r3, lo12(__sigsetjmp@PLT)
+	add     $r3, $r3, $r2
+
+	jr      $r3
+#else /* NOT PIC */
+	la	$r15, C_SYMBOL_NAME(__sigsetjmp)
+	jr	$r15
+#endif
+
+END(_setjmp)
+libc_hidden_def(_setjmp)
diff --git a/libc/sysdeps/linux/nds32/bsd-setjmp.S b/libc/sysdeps/linux/nds32/bsd-setjmp.S
new file mode 100644
index 000000000..b00e62da8
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/bsd-setjmp.S
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* This just does a tail-call to `__sigsetjmp (ARG, 1)'.
+   We cannot do it in C because it must be a tail-call, so frame-unwinding
+   in setjmp doesn't clobber the state restored by longjmp.  */
+
+#include <sysdep.h>
+
+ENTRY(setjmp)
+	move	$r1, #1
+
+/* Make a tail call to __sigsetjmp.  */
+#ifdef PIC
+	/* Initialize $r2 as $gp value.  */
+	sethi   $r2, hi20(_GLOBAL_OFFSET_TABLE_-8)
+	ori     $r2, $r2, lo12(_GLOBAL_OFFSET_TABLE_-4)
+	mfusr   $r15, $pc
+	add     $r2, $r15, $r2
+
+	! la    $r3, __sigsetjmp@PLT
+	sethi   $r3, hi20(__sigsetjmp@PLT)
+	ori     $r3, $r3, lo12(__sigsetjmp@PLT)
+	add     $r3, $r3, $r2
+
+	jr      $r3
+#else /* NOT PIC */
+	la	$r15, C_SYMBOL_NAME(__sigsetjmp)
+	jr	$r15
+#endif
+
+END (setjmp)
diff --git a/libc/sysdeps/linux/nds32/clone.S b/libc/sysdeps/linux/nds32/clone.S
new file mode 100644
index 000000000..5dba17896
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/clone.S
@@ -0,0 +1,93 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* clone() is even more special than fork() as it mucks with stacks
+   and invokes a function in the right context after its all over.  */
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+#define _ERRNO_H	1
+#include <bits/errno.h>
+
+/*
+       int clone(int (*fn)(void *), void *child_stack, int flags, void *arg);
+       _syscall2(int, clone, int, flags, void *, child_stack)
+*/
+
+ENTRY(__clone)
+#ifdef PIC
+	/* set GP register to parent only, cause child's $SP will be $r1. */
+	pushm	$fp, $gp
+#ifndef __NDS32_N1213_43U1H__
+	mfusr $r15, $PC
+#endif
+	sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$gp,	$r15
+#endif
+        /* sanity check arguments.  */
+        beqz    $r0, 1f
+        bnez    $r1, 2f
+
+1:
+        movi    $r0, -EINVAL
+5:
+#ifdef PIC
+		  /* restore GP register, only in parent's stack */
+		  popm	$fp, $gp
+        la      $r15, C_SYMBOL_NAME(__syscall_error@PLT)
+        jr      $r15
+#else
+        b       C_SYMBOL_NAME(__syscall_error)
+#endif
+
+2:
+	/* Child's $SP will be $r1, push to child's stack only. */
+	addi	$r1, $r1, -4
+        swi.p   $r3, [$r1], -4  ! arg
+        swi     $r0, [$r1]  ! fn
+
+        /* do the system call */
+        or      $r0, $r2, $r2   ! move r0, r2
+        __do_syscall(clone)
+	!syscall (__NR_clone)
+        beqz    $r0, 4f
+        bltz    $r0, 5b
+
+        ! parent
+#ifdef PIC
+	/* restore GP register, only in parent's stack */
+	popm	$fp, $gp
+#endif
+        ret
+
+4:
+	/* Only in child's stack. */
+        pop     $r1  ! fn
+        pop     $r0  ! arg
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+	addi	$sp, $sp, -24
+#endif
+	! use r15 in case _exit is PIC
+#ifdef __NDS32_N1213_43U1H__
+        or      $r15, $r1, $r1   ! move r15, r2
+#endif
+        bral    $r1
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+	addi	$sp, $sp, 24
+#endif
+	! use r15 in case _exit is PIC
+#ifdef PIC
+        la      $r15, C_SYMBOL_NAME(_exit@PLT)
+        jr      $r15
+#else
+        b       C_SYMBOL_NAME(_exit)
+#endif
+
+
+PSEUDO_END (__clone)
+weak_alias (__clone, clone)
diff --git a/libc/sysdeps/linux/nds32/crt1.S b/libc/sysdeps/linux/nds32/crt1.S
new file mode 100644
index 000000000..54544010f
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/crt1.S
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Startup code compliant to the ELF NDS32 ABI */
+
+#include <sys/regdef.h>
+#include <features.h>
+#define BP_SYM(name) name
+
+/* We need to call:
+   __uClibc_main (int (*main) (int, char **, char **), int argc,
+		      char **argv, void (*init) (void), void (*fini) (void),
+		      void (*rtld_fini) (void), void *stack_end)
+*/
+
+.text
+	.globl	_start
+	.type	_start,@function
+	.type	_init,@function
+	.type	_fini,@function
+#ifndef __UCLIBC_CTOR_DTOR__
+	.weak	_init
+	.weak	_fini
+#endif
+	.type	    main,@function
+	.type	    __uClibc_main,@function
+#ifdef SHARED
+.pic
+1:
+	ret
+#endif
+
+_start:
+	movi    $fp,	0		! clear FP
+	lwi	$r1,	[$sp + 0]	! r1 = argc
+	addi	$r2,	$sp,	4	! r2 = argv
+
+	/* align sp to 8-byte boundary */
+	movi	$r0,	-8
+	and	$sp,	$sp,	$r0
+
+	addi	$r6,	$sp,	0	! r6 = stack top
+
+#ifdef SHARED
+	/* set gp register */
+#ifdef __NDS32_N1213_43U1H__
+	jal	1b
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_)
+	ori	$gp,	$gp, LO12(_GLOBAL_OFFSET_TABLE_ + 4)
+	add	$gp,	$lp,	$gp
+#else
+	mfusr 	$r15, 	$PC
+	sethi	$gp,	HI20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp, LO12(_GLOBAL_OFFSET_TABLE_ + 8)
+	add	$gp,	$r15,	$gp
+#endif
+
+	la		$r3,	_init@GOTOFF
+	la		$r4,	_fini@GOTOFF
+	la		$r0,	main@GOT
+
+	/* push everything to stack, r5 is rtld_fini and r7 is garbage */
+	pushm	$r0,	$r7
+
+	/* now start it up */
+	bal	__uClibc_main@PLT
+
+	/* should never get here */
+	bal	abort@PLT
+#else
+	la      $gp, _SDA_BASE_ ! init GP for small data access
+
+	la		$r3,	_init
+	la		$r4,	_fini
+	la		$r0,	main
+
+	/* push everything to stack, r5 is rtld_fini and r7 is garbage */
+	pushm	$r0,	$r7
+
+	/* now start it up */
+	bal	__uClibc_main
+
+	/* should never get here */
+	bal	abort
+#endif
+	ret
+
+/* Define a symbol for the first piece of initialized data.  */
+	.data
+	.globl __data_start
+__data_start:
+	.long	0
+	.weak data_start
+	data_start = __data_start
diff --git a/libc/sysdeps/linux/nds32/crti.S b/libc/sysdeps/linux/nds32/crti.S
new file mode 100644
index 000000000..92e5e7175
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/crti.S
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+	.pic
+#APP
+	.section .init
+	.align	2
+	.globl	_init
+	.type	_init, @function
+_init:
+.LFB28:
+        ! Generate instructions for ABI: 1
+	! pretend args size: 0, auto vars size: 0, pushed regs size: 12, outgoing args size: 24
+        ! Generate instructions for ABI: 2
+	! pretend args size: 0, auto vars size: 0, pushed regs size: 12, outgoing args size: 0
+	! frame pointer: $fp, needed: yes
+	! $fp $gp $lp
+	! prologue
+	.off_16bit
+	smw.adm $sp,[$sp],$sp,#0x8
+	smw.adm $sp,[$sp],$sp,#0x6
+	.restore_16bit
+#ifdef __NDS32_N1213_43U1H__
+	sethi	$gp, hi20(_GLOBAL_OFFSET_TABLE_+8)
+	ori	$gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_+12)
+#else
+	sethi	$gp, hi20(_GLOBAL_OFFSET_TABLE_-8)
+	ori	$gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_-4)
+	mfusr	$ta, $pc
+#endif
+	add	$gp, $ta, $gp
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+        addi    $sp, $sp, -4
+        addi    $fp, $sp, 8
+#else
+        addi    $sp, $sp, -28
+        addi    $fp, $sp, 32
+#endif
+	! end of prologue
+#APP
+	.align	2
+
+	.section .fini
+	.align	2
+	.globl	_fini
+	.type	_fini, @function
+_fini:
+.LFB29:
+        ! Generate instructions for ABI: 1
+	! pretend args size: 0, auto vars size: 0, pushed regs size: 12, outgoing args size: 24
+        ! Generate instructions for ABI: 2
+	! pretend args size: 0, auto vars size: 0, pushed regs size: 12, outgoing args size: 0
+	! frame pointer: $fp, needed: yes
+	! $fp $gp $lp
+	! prologue
+	.off_16bit
+	smw.adm $sp,[$sp],$sp,#0x8
+	smw.adm $sp,[$sp],$sp,#0x6
+	.restore_16bit
+#ifdef __NDS32_N1213_43U1H__
+	sethi	$gp, hi20(_GLOBAL_OFFSET_TABLE_+8)
+	ori	$gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_+12)
+#else
+	sethi	$gp, hi20(_GLOBAL_OFFSET_TABLE_-8)
+	ori	$gp, $gp, lo12(_GLOBAL_OFFSET_TABLE_-4)
+	mfusr	$ta, $pc
+#endif
+	add	$gp, $ta, $gp
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+        addi    $sp, $sp, -4
+        addi    $fp, $sp, 8
+#else
+        addi    $sp, $sp, -28
+        addi    $fp, $sp, 32
+#endif
+	! end of prologue
+#APP
+	.align  2
+	.ident	"GCC: (GNU) 3.4.4"
diff --git a/libc/sysdeps/linux/nds32/crtn.S b/libc/sysdeps/linux/nds32/crtn.S
new file mode 100644
index 000000000..7cc543e20
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/crtn.S
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+	.pic
+#APP
+	.section .init
+	! epilogue
+	addi 	$sp,$fp,#-4
+	lmw.bim $sp,[$sp],$sp,#0x6
+	lwi.bi  $fp,[$sp],#4
+	ret
+.LFE28:
+	.section .fini
+#NO_APP
+	! epilogue
+	addi 	$sp,$fp,#-4
+	lmw.bim $sp,[$sp],$sp,#0x6
+	lwi.bi  $fp,[$sp],#4
+	ret
+.LFE29:
+#APP
+	.ident	"GCC: (GNU) 3.4.4"
diff --git a/libc/sysdeps/linux/nds32/jmpbuf-offsets.h b/libc/sysdeps/linux/nds32/jmpbuf-offsets.h
new file mode 100644
index 000000000..e88278f62
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/jmpbuf-offsets.h
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Private macros for accessing __jmp_buf contents.  NDS32 version.
+   Copyright (C) 2006 Free Software Foundation, Inc.
+
+   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/>.  */
+
+/*
+r6 r7 r8 r9 r10 r11 r12 r13 r14 r16 r17 r18 r19 r28 r29 r30 r31
+ 0  1  2  3   4   5   6   7   8   9  10  11  12  13  14  15  16
+*/
+
+#define __JMP_BUF_SP            12
diff --git a/libc/sysdeps/linux/nds32/jmpbuf-unwind.h b/libc/sysdeps/linux/nds32/jmpbuf-unwind.h
new file mode 100644
index 000000000..14a302969
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/jmpbuf-unwind.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <setjmp.h>
+#include <jmpbuf-offsets.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#define _JMPBUF_UNWINDS(jmpbuf, address) \
+  ((void *) (address) < (void *) &(jmpbuf)[0].__regs[__JMP_BUF_SP])
diff --git a/libc/sysdeps/linux/nds32/mmap.S b/libc/sysdeps/linux/nds32/mmap.S
new file mode 100644
index 000000000..351d1c502
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/mmap.S
@@ -0,0 +1,101 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+	.text
+
+.globl __mmap
+ENTRY (__mmap)
+
+#ifdef PIC
+.pic
+#endif
+
+   // reserve space for r0, r1
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+   addi  $sp, $sp, -8
+#endif
+   // change to units  of the  system  page  size
+   srli $r5, $r5, 0xc
+
+   syscall SYS_ify(mmap2)
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+   addi  $sp, $sp, 8
+#endif
+
+   /* r0 is < -4096 if there was an error.  */
+   bgez $r0, 1f
+   sltsi $r1,$r0,-4096
+   beqz $r1,2f
+
+1:
+   ret
+2:
+#ifdef PIC
+#ifdef __NDS32_N1213_43U1H__
+	! save lp
+	addi	$r2,	$lp,	0
+
+	! set r1 as gp
+	jal	1b
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_)
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4)
+	add	$r1,	$lp,	$r1
+
+	! restore lp
+	addi	$lp,	$r2,	0
+
+	! r15=SYSCALL_ERROR@PLT
+	sethi $r15, hi20(SYSCALL_ERROR@PLT)
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#else
+	! set r1 as gp
+	mfusr $r15, $PC
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$r1,	$r1,	$r15
+
+	! r15=SYSCALL_ERROR@PLT
+	sethi $r15, hi20(SYSCALL_ERROR@PLT)
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#endif
+#else
+	j SYSCALL_ERROR
+#endif
+
+ret
+
+PSEUDO_END (__mmap)
+
+weak_alias (__mmap, mmap)
+libc_hidden_def(mmap)
diff --git a/libc/sysdeps/linux/nds32/setjmp.S b/libc/sysdeps/linux/nds32/setjmp.S
new file mode 100644
index 000000000..8cb9adbeb
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/setjmp.S
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/*
+  setjmp/longjmp for nds32.
+  r0 - r5 are for paramter passing - no need to save
+  r6 - r14 are callee saved - needs to save
+  r15 is temp register for assembler - no need to save
+  r16 - r25 are caller saved - no need to save
+  r26 - r27 are temp registers for OS - no need to save
+  r28 is fp - need to save
+  r29 is gp - need to save
+  r30 is ra - need to save
+  r31 is sp - need to save
+  so we need to save r6 - r14 and r28 - r31
+  The jmpbuf looks like this:
+  r6
+  r7
+  r8
+  r9
+  r10
+  r11
+  r12
+  r13
+  r14
+  fp
+  gp
+  ra
+  sp
+#ifdef NDS32_ABI_2FP_PLUS
+  ($fpcfg.freg)
+  (callee-saved FPU regs)
+#endif
+  reserved(for 8-byte align if needed)
+*/
+
+#include <sysdep.h>
+#define _SETJMP_H
+#define _ASM
+#include <bits/setjmp.h>
+	.section .text
+
+ENTRY(__sigsetjmp)
+	move	$r2, $r0
+.off_16bit
+	! save registers into buffer
+	smw.bim	$r6, [$r2], $r14, #0xf
+.restore_16bit
+
+#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.  */
+	swi.bi	$r20, [$r2], #4
+
+	/* 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.bi	$fd31, [$r2], #8
+	fsdi.bi	$fd30, [$r2], #8
+	fsdi.bi	$fd29, [$r2], #8
+	fsdi.bi	$fd28, [$r2], #8
+	fsdi.bi	$fd27, [$r2], #8
+	fsdi.bi	$fd26, [$r2], #8
+	fsdi.bi	$fd25, [$r2], #8
+	fsdi.bi	$fd24, [$r2], #8
+.LCFG2:
+	fsdi.bi	$fd10, [$r2], #8
+	fsdi.bi	$fd9, [$r2], #8
+	fsdi.bi	$fd8, [$r2], #8
+.LCFG1:
+	fsdi.bi	$fd7, [$r2], #8
+	fsdi.bi	$fd6, [$r2], #8
+	fsdi.bi	$fd5, [$r2], #8
+	fsdi.bi	$fd4, [$r2], #8
+.LCFG0:
+	fsdi.bi	$fd3, [$r2], #8
+#endif /* NDS32_ABI_2FP_PLUS */
+
+
+/* Make a tail call to __sigjmp_save.  */
+#ifdef PIC
+	/* Initialize $r2 as $gp value.  */
+	sethi   $r2, hi20(_GLOBAL_OFFSET_TABLE_-8)
+	ori     $r2, $r2, lo12(_GLOBAL_OFFSET_TABLE_-4)
+	mfusr   $r15, $pc
+	add     $r2, $r15, $r2
+
+	! la    $r3, __sigjmp_save@PLT
+	sethi   $r3, hi20(__sigjmp_save@PLT)
+	ori     $r3, $r3, lo12(__sigjmp_save@PLT)
+	add     $r3, $r3, $r2
+
+	jr      $r3
+#else /* NOT PIC */
+	la	$r15, C_SYMBOL_NAME(__sigjmp_save)
+	jr	$r15
+#endif
+
+END(__sigsetjmp)
+hidden_def(__sigsetjmp)
diff --git a/libc/sysdeps/linux/nds32/sigaction.c b/libc/sysdeps/linux/nds32/sigaction.c
new file mode 100644
index 000000000..1a24c49b4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sigaction.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <sys/syscall.h>
+#include <string.h>
+#include <bits/kernel_sigaction.h>
+
+#define SA_RESTORER	0x04000000
+
+extern void __default_sa_restorer(void);
+
+int __libc_sigaction(int sig, const struct sigaction *act,
+					  struct sigaction *oact)
+{
+	struct sigaction kact;
+
+	if (act && !(act->sa_flags & SA_RESTORER)) {
+		memcpy(&kact, act, sizeof(kact));
+		kact.sa_restorer = __default_sa_restorer;
+		kact.sa_flags |= SA_RESTORER;
+		act = &kact;
+	}
+	/* NB: kernel (as of 2.6.25) will return EINVAL
+	 * if sizeof(act->sa_mask) does not match kernel's sizeof(sigset_t) */
+	return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
+}
+
+#ifndef LIBC_SIGACTION
+# ifndef __UCLIBC_HAS_THREADS__
+strong_alias(__libc_sigaction,sigaction)
+libc_hidden_def(sigaction)
+# else
+weak_alias(__libc_sigaction,sigaction)
+libc_hidden_weak(sigaction)
+# endif
+#endif
diff --git a/libc/sysdeps/linux/nds32/sigrestorer.S b/libc/sysdeps/linux/nds32/sigrestorer.S
new file mode 100644
index 000000000..bf6188656
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sigrestorer.S
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+/* If no SA_RESTORER function was specified by the application we use
+   one of these.  This avoids the need for the kernel to synthesise a return
+   instruction on the stack, which would involve expensive cache flushes. */
+
+ENTRY(__default_sa_restorer)
+	/* DO NOT SAVE r7 INTO STACK, THIS SYSCALL NEVER RETURN */
+	syscall	SYS_ify(sigreturn)
+END(__default_sa_restorer)
+
+#ifdef __NR_rt_sigreturn
+
+ENTRY(__default_rt_sa_restorer)
+	/* DO NOT SAVE r7 INTO STACK, THIS SYSCALL NEVER RETURN */
+	syscall	SYS_ify(rt_sigreturn)
+END(__default_rt_sa_restorer)
+
+#endif
diff --git a/libc/sysdeps/linux/nds32/sys/elf.h b/libc/sysdeps/linux/nds32/sys/elf.h
new file mode 100644
index 000000000..519948641
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/elf.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _SYS_ELF_H
+#define _SYS_ELF_H	1
+
+#warning "This header is obsolete; use <sys/procfs.h> instead."
+
+#include <sys/procfs.h>
+
+#endif	/* _SYS_ELF_H */
diff --git a/libc/sysdeps/linux/nds32/sys/io.h b/libc/sysdeps/linux/nds32/sys/io.h
new file mode 100644
index 000000000..68639902c
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/io.h
@@ -0,0 +1,48 @@
+/* Copyright (C) 1996, 1998, 1999 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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef	_SYS_IO_H
+
+#define	_SYS_IO_H	1
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* If TURN_ON is TRUE, request for permission to do direct i/o on the
+   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
+   permission off for that range.  This call requires root privileges.  */
+extern int ioperm (unsigned long int __from, unsigned long int __num,
+		   int __turn_on) __THROW;
+
+/* Set the I/O privilege level to LEVEL.  If LEVEL is nonzero,
+   permission to access any I/O port is granted.  This call requires
+   root privileges. */
+extern int iopl (int __level) __THROW;
+
+/* The functions that actually perform reads and writes.  */
+extern unsigned char inb (unsigned long int port) __THROW;
+extern unsigned short int inw (unsigned long int port) __THROW;
+extern unsigned long int inl (unsigned long int port) __THROW;
+
+extern void outb (unsigned char value, unsigned long int port) __THROW;
+extern void outw (unsigned short value, unsigned long int port) __THROW;
+extern void outl (unsigned long value, unsigned long int port) __THROW;
+
+__END_DECLS
+
+#endif /* _SYS_IO_H */
diff --git a/libc/sysdeps/linux/nds32/sys/procfs.h b/libc/sysdeps/linux/nds32/sys/procfs.h
new file mode 100644
index 000000000..f39a36990
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/procfs.h
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1996, 1997, 1999, 2001 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_PROCFS_H
+#define _SYS_PROCFS_H	1
+
+/* This is somewhat modelled after the file of the same name on SVR4
+   systems.  It provides a definition of the core file format for ELF
+   used on Linux.  It doesn't have anything to do with the /proc file
+   system, even though Linux has one.
+
+   Anyway, the whole purpose of this file is for GDB and GDB only.
+   Don't read too much into it.  Don't use it for anything other than
+   GDB unless you know what you are doing.  */
+
+#include <features.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/user.h>
+
+__BEGIN_DECLS
+
+/* Type for a general-purpose register.  */
+typedef unsigned long elf_greg_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_regs) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* Register set for the floating-point registers.  */
+typedef struct user_fpregs elf_fpregset_t;
+
+/* Signal info.  */
+struct elf_siginfo
+  {
+    int si_signo;			/* Signal number.  */
+    int si_code;			/* Extra code.  */
+    int si_errno;			/* Errno.  */
+  };
+
+/* Definitions to generate Intel SVR4-like core files.  These mostly
+   have the same names as the SVR4 types with "elf_" tacked on the
+   front to prevent clashes with Linux definitions, and the typedef
+   forms have been avoided.  This is mostly like the SVR4 structure,
+   but more Linuxy, with things that Linux does not support and which
+   GDB doesn't really use excluded.  */
+
+struct elf_prstatus
+  {
+    struct elf_siginfo pr_info;		/* Info associated with signal.  */
+    short int pr_cursig;		/* Current signal.  */
+    unsigned long int pr_sigpend;	/* Set of pending signals.  */
+    unsigned long int pr_sighold;	/* Set of held signals.  */
+    __pid_t pr_pid;
+    __pid_t pr_ppid;
+    __pid_t pr_pgrp;
+    __pid_t pr_sid;
+    struct timeval pr_utime;		/* User time.  */
+    struct timeval pr_stime;		/* System time.  */
+    struct timeval pr_cutime;		/* Cumulative user time.  */
+    struct timeval pr_cstime;		/* Cumulative system time.  */
+    elf_gregset_t pr_reg;		/* GP registers.  */
+    int pr_fpvalid;			/* True if math copro being used.  */
+  };
+
+
+#define ELF_PRARGSZ     (80)    /* Number of chars for args.  */
+
+struct elf_prpsinfo
+  {
+    char pr_state;			/* Numeric process state.  */
+    char pr_sname;			/* Char for pr_state.  */
+    char pr_zomb;			/* Zombie.  */
+    char pr_nice;			/* Nice val.  */
+    unsigned long int pr_flag;		/* Flags.  */
+    unsigned short int pr_uid;
+    unsigned short int pr_gid;
+    int pr_pid, pr_ppid, pr_pgrp, pr_sid;
+    /* Lots missing */
+    char pr_fname[16];			/* Filename of executable.  */
+    char pr_psargs[ELF_PRARGSZ];	/* Initial part of arg list.  */
+  };
+
+/* The rest of this file provides the types for emulation of the
+   Solaris <proc_service.h> interfaces that should be implemented by
+   users of libthread_db.  */
+
+/* Addresses.  */
+typedef void *psaddr_t;
+
+/* Register sets.  Linux has different names.  */
+typedef elf_gregset_t prgregset_t;
+typedef elf_fpregset_t prfpregset_t;
+
+/* We don't have any differences between processes and threads,
+   therefore have only one PID type.  */
+typedef __pid_t lwpid_t;
+
+/* Process status and info.  In the end we do provide typedefs for them.  */
+typedef struct elf_prstatus prstatus_t;
+typedef struct elf_prpsinfo prpsinfo_t;
+
+__END_DECLS
+
+#endif	/* sys/procfs.h */
diff --git a/libc/sysdeps/linux/nds32/sys/ptrace.h b/libc/sysdeps/linux/nds32/sys/ptrace.h
new file mode 100644
index 000000000..3ca259ae3
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/ptrace.h
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* `ptrace' debugger support interface.  Linux version.
+   Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_PTRACE_H
+#define _SYS_PTRACE_H	1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* Type of the REQUEST argument to `ptrace.'  */
+enum __ptrace_request
+{
+  /* Indicate that the process making this request should be traced.
+     All signals received by this process can be intercepted by its
+     parent, and its parent can use the other `ptrace' requests.  */
+  PTRACE_TRACEME = 0,
+#define PT_TRACE_ME PTRACE_TRACEME
+
+  /* Return the word in the process's text space at address ADDR.  */
+  PTRACE_PEEKTEXT = 1,
+#define PT_READ_I PTRACE_PEEKTEXT
+
+  /* Return the word in the process's data space at address ADDR.  */
+  PTRACE_PEEKDATA = 2,
+#define PT_READ_D PTRACE_PEEKDATA
+
+  /* Return the word in the process's user area at offset ADDR.  */
+  PTRACE_PEEKUSER = 3,
+#define PT_READ_U PTRACE_PEEKUSER
+
+  /* Write the word DATA into the process's text space at address ADDR.  */
+  PTRACE_POKETEXT = 4,
+#define PT_WRITE_I PTRACE_POKETEXT
+
+  /* Write the word DATA into the process's data space at address ADDR.  */
+  PTRACE_POKEDATA = 5,
+#define PT_WRITE_D PTRACE_POKEDATA
+
+  /* Write the word DATA into the process's user area at offset ADDR.  */
+  PTRACE_POKEUSER = 6,
+#define PT_WRITE_U PTRACE_POKEUSER
+
+  /* Continue the process.  */
+  PTRACE_CONT = 7,
+#define PT_CONTINUE PTRACE_CONT
+
+  /* Kill the process.  */
+  PTRACE_KILL = 8,
+#define PT_KILL PTRACE_KILL
+
+  /* Single step the process.
+     This is not supported on all machines.  */
+  PTRACE_SINGLESTEP = 9,
+#define PT_STEP PTRACE_SINGLESTEP
+
+  /* Get all general purpose registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_GETREGS = 12,
+#define PT_GETREGS PTRACE_GETREGS
+
+  /* Set all general purpose registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_SETREGS = 13,
+#define PT_SETREGS PTRACE_SETREGS
+
+  /* Get all floating point registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_GETFPREGS = 14,
+#define PT_GETFPREGS PTRACE_GETFPREGS
+
+  /* Set all floating point registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_SETFPREGS = 15,
+#define PT_SETFPREGS PTRACE_SETFPREGS
+
+  /* Attach to a process that is already running. */
+  PTRACE_ATTACH = 16,
+#define PT_ATTACH PTRACE_ATTACH
+
+  /* Detach from a process attached to with PTRACE_ATTACH.  */
+  PTRACE_DETACH = 17,
+#define PT_DETACH PTRACE_DETACH
+
+  /* Get all extended floating point registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_GETFPXREGS = 18,
+#define PT_GETFPXREGS PTRACE_GETFPXREGS
+
+  /* Set all extended floating point registers used by a processes.
+     This is not supported on all machines.  */
+   PTRACE_SETFPXREGS = 19,
+#define PT_SETFPXREGS PTRACE_SETFPXREGS
+
+  /* Continue and stop at the next (return from) syscall.  */
+  PTRACE_SYSCALL = 24
+#define PT_SYSCALL PTRACE_SYSCALL
+};
+
+/* Perform process tracing functions.  REQUEST is one of the values
+   above, and determines the action to be taken.
+   For all requests except PTRACE_TRACEME, PID specifies the process to be
+   traced.
+
+   PID and the other arguments described above for the various requests should
+   appear (those that are used for the particular request) as:
+     pid_t PID, void *ADDR, int DATA, void *ADDR2
+   after REQUEST.  */
+extern long int ptrace (enum __ptrace_request __request, ...) __THROW;
+
+__END_DECLS
+
+#endif /* _SYS_PTRACE_H */
diff --git a/libc/sysdeps/linux/nds32/sys/regdef.h b/libc/sysdeps/linux/nds32/sys/regdef.h
new file mode 100644
index 000000000..e37dcdd62
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/regdef.h
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1997, 1998, 2002, 2003, 2004 Free Software Foundation, Inc.
+   Contributed by Ralf Baechle <ralf@gnu.org>.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_REGDEF_H
+#define _SYS_REGDEF_H
+
+/*
+ * Symbolic register names for 32 bit ABI
+ */
+#define o0	r0	/* arguments r0 ~ r5 */
+#define o1	r1
+#define o2	r2
+#define o3	r3
+#define o4	r4
+#define o5	r5
+#define o6	r6
+#define o7	r7
+
+#define h0	r0	/* arguments r0 ~ r5 */
+#define h1	r1
+#define h2	r2
+#define h3	r3
+#define h4	r4
+#define h5	r5
+#define h6	r6
+#define h7	r7
+#define h8	r8
+#define h9	r9
+#define h10	r10
+#define h11	r11
+#define h12	r16
+#define h13	r17
+#define h14	r18
+#define h15	r19
+
+#define a0	r0	/* arguments r0 ~ r5 */
+#define a1	r1
+#define a2	r2
+#define a3	r3
+#define a4	r4
+#define a5	r5
+#define s0	r6
+#define s1	r7
+#define s2	r8
+#define s3	r9
+#define s4	r10
+#define s5	r11
+#define s6	r12
+#define s7	r13
+#define s8	r14
+#define ta	r15
+#define t0	r16
+#define t1	r17
+#define t2	r18
+#define t3	r19
+#define t4	r20
+#define t5	r21
+#define t6	r22
+#define t7	r23
+#define t8	r24
+#define t9	r25
+#define p0	r26
+#define p1	r27
+#define r28	fp
+#define s9	r28
+#define r29	gp
+#define r30	ra
+#define r31	sp
+
+#endif /* _SYS_REGDEF_H */
diff --git a/libc/sysdeps/linux/nds32/sys/ucontext.h b/libc/sysdeps/linux/nds32/sys/ucontext.h
new file mode 100644
index 000000000..4dca27fd5
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/ucontext.h
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+#include <sys/procfs.h>
+
+typedef int greg_t;
+
+/* Number of general registers.  */
+#define NGREG	32
+
+/* Container for all general registers.  */
+typedef elf_gregset_t gregset_t;
+
+/* Number of each register is the `gregset_t' array.  */
+enum
+{
+  R0 = 0,
+#define R0	R0
+  R1 = 1,
+#define R1	R1
+  R2 = 2,
+#define R2	R2
+  R3 = 3,
+#define R3	R3
+  R4 = 4,
+#define R4	R4
+  R5 = 5,
+#define R5	R5
+  R6 = 6,
+#define R6	R6
+  R7 = 7,
+#define R7	R7
+  R8 = 8,
+#define R8	R8
+  R9 = 9,
+#define R9	R9
+  R10 = 10,
+#define R10	R10
+  R11 = 11,
+#define R11	R11
+  R12 = 12,
+#define R12	R12
+  R13 = 13,
+#define R13	R13
+  R14 = 14,
+#define R14	R14
+  R15 = 15,
+#define R15	R15
+  R16 = 16,
+#define R16     R16
+  R17 = 17,
+#define R17     R17
+  R18 = 18,
+#define R18     R18
+  R19 = 19,
+#define R19     R19
+  R20 = 20,
+#define R20     R20
+  R21 = 21,
+#define R21     R21
+  R22 = 22,
+#define R22     R22
+  R23 = 23,
+#define R23     R23
+  R24 = 24,
+#define R24     R24
+  R25 = 25,
+#define R25     R25
+  R26 = 26,
+#define R26     R26
+  R27 = 27,
+#define R27     R27
+  R28 = 28,
+#define R28     R28
+  R29 = 29,
+#define R29     R29
+  R30 = 30,
+#define R30     R30
+  R31 = 31
+#define R31     R31
+
+};
+
+/* Structure to describe FPU registers.  */
+typedef elf_fpregset_t	fpregset_t;
+
+/* Context to describe whole processor state.  */
+typedef struct
+  {
+    gregset_t gregs;
+    fpregset_t fpregs;
+  } mcontext_t;
+
+/* Userlevel context.  */
+typedef struct ucontext
+  {
+    unsigned long int uc_flags;
+    struct ucontext *uc_link;
+    __sigset_t uc_sigmask;
+    stack_t uc_stack;
+    mcontext_t uc_mcontext;
+    long int uc_filler[5];
+  } ucontext_t;
+
+#endif /* sys/ucontext.h */
diff --git a/libc/sysdeps/linux/nds32/sys/user.h b/libc/sysdeps/linux/nds32/sys/user.h
new file mode 100644
index 000000000..ca5896d1f
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sys/user.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#ifndef _SYS_USER_H
+#define _SYS_USER_H	1
+
+/* The whole purpose of this file is for GDB and GDB only.  Don't read
+   too much into it.  Don't use it for anything other than GDB unless
+   you know what you are doing.  */
+
+struct user_fpregs
+{
+  struct fp_reg
+  {
+    unsigned int sign1:1;
+    unsigned int unused:15;
+    unsigned int sign2:1;
+    unsigned int exponent:14;
+    unsigned int j:1;
+    unsigned int mantissa1:31;
+    unsigned int mantissa0:32;
+  } fpregs[8];
+  unsigned int fpsr:32;
+  unsigned int fpcr:32;
+  unsigned char ftype[8];
+  unsigned int init_flag;
+};
+
+struct user_regs
+{
+  unsigned long int uregs[18];
+};
+
+struct user
+{
+  struct user_regs regs;	/* General registers */
+  int u_fpvalid;		/* True if math co-processor being used. */
+
+  unsigned long int u_tsize;	/* Text segment size (pages). */
+  unsigned long int u_dsize;	/* Data segment size (pages). */
+  unsigned long int u_ssize;	/* Stack segment size (pages). */
+
+  unsigned long start_code;	/* Starting virtual address of text. */
+  unsigned long start_stack;	/* Starting virtual address of stack. */
+
+  long int signal;     		/* Signal that caused the core dump. */
+  int reserved;			/* No longer used */
+  struct user_regs *u_ar0;	/* help gdb to find the general registers. */
+
+  unsigned long magic;		/* uniquely identify a core file */
+  char u_comm[32];		/* User command that was responsible */
+  int u_debugreg[8];
+  struct user_fpregs u_fp;	/* Floating point registers */
+  struct user_fpregs *u_fp0;	/* help gdb to find the FP registers. */
+};
+
+#include <bits/uClibc_page.h>
+#define NBPG			PAGE_SIZE
+#define UPAGES			1
+#define HOST_TEXT_START_ADDR	(u.start_code)
+#define HOST_DATA_START_ADDR	(u.start_data)
+#define HOST_STACK_END_ADDR	(u.start_stack + u.u_ssize * NBPG)
+
+#endif  /* sys/user.h */
diff --git a/libc/sysdeps/linux/nds32/syscall.S b/libc/sysdeps/linux/nds32/syscall.S
new file mode 100644
index 000000000..032c643fd
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/syscall.S
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+	.text
+#ifdef PIC
+	.pic
+#endif
+	.align 2
+
+
+#ifdef PIC
+#ifdef __NDS32_N1213_43U1H__
+1:
+	ret
+99:
+	addi 	$r2, $lp, 0
+	jal 	1b
+	sethi 	$r1, hi20(_GLOBAL_OFFSET_TABLE_)
+	ori 	$r1, $r1, lo12(_GLOBAL_OFFSET_TABLE_+4)
+	add 	$r1, $lp, $r1
+	addi 	$lp, $r2, 0
+#else		/* !__NDS32_N1213_43U1H__ */
+99:
+	mfusr 	$r15, $PC
+	sethi 	$r1, hi20(_GLOBAL_OFFSET_TABLE_ + 4)
+	ori 	$r1, $r1, lo12(_GLOBAL_OFFSET_TABLE_ + 8)
+	add 	$r1, $r15, $r1
+#endif		/* end of __NDS32_N1213_43U1H__ */
+	sethi 	$r15, hi20(__syscall_error@PLT)
+	ori 	$r15, $r15, lo12(__syscall_error@PLT)
+	add 	$r15, $r15, $r1
+	jr 		$r15
+#else		/* !PIC	*/
+99:
+	j __syscall_error
+#endif		/* end of PIC */
+
+#ifdef PIC	
+	.pic 
+#endif
+
+	.align 2
+	.globl syscall
+	.func syscall
+	.type syscall, @function
+
+syscall:
+	syscall __NR_syscall
+	bgez $r0, 2f
+	sltsi $r1, $r0, -4096; 
+	beqz $r1, 99b; 
+2:
+	ret
+	.endfunc 
+	.size syscall, .-syscall
diff --git a/libc/sysdeps/linux/nds32/sysdep.S b/libc/sysdeps/linux/nds32/sysdep.S
new file mode 100644
index 000000000..4e86a26e0
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sysdep.S
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1991-2003 Free Software Foundation, Inc.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+ 
+#include <sysdep.h>
+#define _ERRNO_H
+#include <bits/errno.h>
+
+.text
+
+.globl C_SYMBOL_NAME(errno)
+.globl __syscall_error
+
+ENTRY (__syscall_error)
+#ifdef OLD_ABI
+	subri $r5, $r5, #0
+#else
+	subri $r0, $r0, #0
+#endif
+
+#define __syscall_error __syscall_error_1
+
+#undef syscall_error
+#ifdef NO_UNDERSCORES
+__syscall_error:
+#else
+syscall_error:
+#endif
+
+#ifdef PIC
+	/* set GP register */
+	pushm	$gp, $lp
+#ifdef __NDS32_N1213_43U1H__
+	jal	2f
+	sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_)
+	ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+4)
+	add	$gp,	$gp,	$lp
+#else
+	mfusr	$r15, $PC
+	sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+	ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+	add	$gp,	$gp,	$r15
+#endif
+#endif
+
+#if defined (EWOULDBLOCK_sys) && EWOULDBLOCK_sys != EAGAIN
+	/* We translate the system's EWOULDBLOCK error into EAGAIN.
+	   The GNU C library always defines EWOULDBLOCK==EAGAIN.
+	   EWOULDBLOCK_sys is the original number.  */
+	   push	$t0
+	   li	$t0, EWOULDBLOCK_sys
+	   bne	$r0, $t0, 1f
+	   pop	$t0
+	   li	$r0, EAGAIN
+1:
+#endif
+
+#ifdef _LIBC_REENTRANT
+	push	$lp
+	push	$r0
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+	addi	$sp,	$sp, -24
+#endif
+
+#ifdef PIC
+	bal	C_SYMBOL_NAME(__errno_location@PLT)
+#else
+	bal	C_SYMBOL_NAME(__errno_location)
+#endif
+#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP)
+#else
+	addi	$sp,	$sp, 24
+#endif
+	pop	$r1
+
+	swi	$r1, [$r0]
+	li	$r0, -1
+	pop	$lp
+#ifdef PIC
+	/* restore GP register */
+	popm	$gp, $lp
+#endif
+2:
+	ret
+#else
+#ifndef	PIC
+	l.w	$r1, .L1
+	swi	$r0, [$r1]
+	li	$r0, -1
+	ret
+
+.L1:	.long C_SYMBOL_NAME(errno)
+#else
+	s.w	$r0, errno@GOTOFF
+	li	$r0, -1
+	
+	/* restore GP register */
+	popm	$gp, $lp
+2:
+	ret
+
+#endif
+#endif
+
+#undef __syscall_error
+END (__syscall_error)
diff --git a/libc/sysdeps/linux/nds32/sysdep.h b/libc/sysdeps/linux/nds32/sysdep.h
new file mode 100644
index 000000000..7472a99d4
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/sysdep.h
@@ -0,0 +1,271 @@
+//#include <sysdeps/generic/sysdep.h>
+#ifdef	__ASSEMBLER__
+/* Define an entry point visible from C.  */
+#ifdef PIC
+#define ENTRY(name)                      \
+  .pic										\
+  .align 2;                              \
+  .globl C_SYMBOL_NAME(name);            \
+  .func  C_SYMBOL_NAME(name);            \
+  .type  C_SYMBOL_NAME(name), @function; \
+C_SYMBOL_NAME(name):
+#else
+#define ENTRY(name)                      \
+  .align 2;                              \
+  .globl C_SYMBOL_NAME(name);            \
+  .func  C_SYMBOL_NAME(name);            \
+  .type  C_SYMBOL_NAME(name), @function; \
+C_SYMBOL_NAME(name):
+#endif
+
+#undef END
+#define END(name) \
+  .endfunc;           \
+  .size C_SYMBOL_NAME(name), .-C_SYMBOL_NAME(name)
+
+/* If compiled for profiling, call `mcount' at the start of each function.  */
+#ifdef HAVE_ELF
+	#undef NO_UNDERSCORES
+	#define NO_UNDERSCORES
+#endif
+
+#ifdef NO_UNDERSCORES
+	#define syscall_error __syscall_error
+#endif
+
+#define SYS_ify(syscall_name)  (__NR_##syscall_name)
+
+#define __do_syscall(syscall_name)		\
+  syscall	SYS_ify(syscall_name);
+
+#define SYSCALL_ERROR_HANDLER
+#define SYSCALL_ERROR __syscall_error
+
+
+#ifdef PIC
+#ifdef __NDS32_N1213_43U1H__
+#ifdef NDS_ABI_V0
+#define PSEUDO(name, syscall_name, args)	\
+  .pic;										\
+  .align 2;					\
+  1:	ret;	\
+  99:	addi	$r0,	$lp,	0;	\
+	jal	1b;	\
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_);	\
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
+	add	$r1,	$lp,	$r1;	\
+	addi	$lp,	$r0,	0;	\
+	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
+	add	$r15, $r15, $r1;	\
+	jr		$r15;	\
+	nop;                                   	\
+	ENTRY(name);                          	\
+	__do_syscall(syscall_name);            	\
+	bgez $r5, 2f;				\
+	sltsi	$r0, $r5, -4096;		\
+	beqz	$r0, 99b;			\
+  2:
+#else
+#define PSEUDO(name, syscall_name, args)	\
+  .pic;										\
+  .align 2;					\
+  1:	ret;	\
+  99:	addi	$r2,	$lp,	0;	\
+	jal	1b;	\
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_);	\
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
+	add	$r1,	$lp,	$r1;	\
+	addi	$lp,	$r2,	0;	\
+	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
+	add	$r15, $r15, $r1;	\
+	jr		$r15;	\
+	nop;                                   	\
+	ENTRY(name);                          	\
+	__do_syscall(syscall_name);            	\
+	bgez $r0, 2f;				\
+	sltsi	$r1, $r0, -4096;		\
+	beqz	$r1, 99b;			\
+  2:
+#endif
+#else
+#define PSEUDO(name, syscall_name, args)	\
+  .pic;										\
+  .align 2;					\
+  99:	mfusr $r15, $PC;	\
+	sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_ + 4);	\
+	ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_ + 8);	\
+	add	$r1,	$r15,	$r1;	\
+	sethi $r15, hi20(SYSCALL_ERROR@PLT);	\
+	ori	$r15,	$r15, lo12(SYSCALL_ERROR@PLT);	\
+	add	$r15, $r15, $r1;	\
+	jr		$r15;	\
+	nop;                                   	\
+	ENTRY(name);                          	\
+	__do_syscall(syscall_name);            	\
+	bgez $r0, 2f;				\
+	sltsi	$r1, $r0, -4096;		\
+	beqz	$r1, 99b;			\
+  2:
+#endif
+#else
+#ifdef OLD2_ABI
+#define PSEUDO(name, syscall_name, args)	\
+  .align 2;					\
+  99:	j SYSCALL_ERROR;                  	\
+	nop;                                   	\
+	ENTRY(name);                          	\
+	__do_syscall(syscall_name);            	\
+        bgez $r5, 2f;                           \
+        sltsi   $r0, $r5, -4096;                \
+        beqz    $r0, 99b;                       \
+  2:
+#else
+#define PSEUDO(name, syscall_name, args)	\
+  .align 2;					\
+  99:	j SYSCALL_ERROR;                  	\
+	nop;                                   	\
+	ENTRY(name);                          	\
+	__do_syscall(syscall_name);            	\
+        bgez $r0, 2f;                           \
+        sltsi   $r1, $r0, -4096;                \
+        beqz    $r1, 99b;                       \
+  2:
+#endif
+#endif
+
+
+#define PSEUDO_NOERRNO(name, syscall_name, args) \
+  ENTRY(name);                                   \
+  __do_syscall(syscall_name);
+
+#undef PSEUDO_END
+#define PSEUDO_END(sym)				\
+	SYSCALL_ERROR_HANDLER			\
+	END(sym)
+
+#undef PSEUDO_END_ERRVAL
+#define PSEUDO_END_ERRVAL(sym) END(sym)
+
+#define PSEUDO_ERRVAL(name, syscall_name, args) PSEUDO_NOERRNO(name, syscall_name, args)
+
+#define ret_ERRVAL ret
+
+#define ret_NOERRNO ret	
+#if defined NOT_IN_libc
+	#define SYSCALL_ERROR __local_syscall_error
+	#ifdef PIC
+		#ifdef __NDS32_N1213_43U1H__
+			#ifdef NDS_ABI_V0
+				#define SYSCALL_ERROR_HANDLER				\
+				__local_syscall_error:	pushm	$gp, $lp, $sp;				\
+					jal	1f;	\
+					sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_);	\
+					ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
+					add	$gp,	$gp,	$lp;	\
+					neg	$r5, $r5;	\
+					push	$r5;				\
+					addi	$sp,	$sp, -28; \
+					bal	C_SYMBOL_NAME(__errno_location@PLT);	\
+					addi	$sp,	$sp, 28; \
+					pop	$r1;			\
+					swi	$r1, [$r5];				\
+					li		$r5, -1;				\
+					popm	$gp, $lp, $sp;				\
+				1:	ret;
+			#else
+				#define SYSCALL_ERROR_HANDLER				\
+					__local_syscall_error:	pushm	$gp, $lp, $sp;				\
+						jal	1f;	\
+						sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_);	\
+						ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+4);	\
+						add	$gp,	$gp,	$lp;	\
+						neg	$r0, $r0;	\
+						push	$r0;				\
+					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+					        addi    $sp,    $sp, -4; \
+					#else \
+						addi	$sp,	$sp, -28; \
+					#endif \
+						bal	C_SYMBOL_NAME(__errno_location@PLT);	\
+					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+					        addi    $sp,    $sp, 4; \
+					#else \
+						addi	$sp,	$sp, 28; \
+					#endif \
+						pop	$r1;			\
+						swi	$r1, [$r0];				\
+						li		$r0, -1;				\
+						popm	$gp, $lp, $sp;				\
+					1:	ret;
+			#endif
+		#else
+			#define SYSCALL_ERROR_HANDLER				\
+				__local_syscall_error:	pushm	$gp, $lp, $sp;				\
+					mfusr $r15, $PC;	\
+					sethi	$gp,	hi20(_GLOBAL_OFFSET_TABLE_+4);	\
+					ori	$gp,	$gp,	lo12(_GLOBAL_OFFSET_TABLE_+8);	\
+					add	$gp,	$gp,	$r15;	\
+					neg	$r0, $r0;	\
+					push	$r0;				\
+					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+					        addi    $sp,    $sp, -4; \
+					#else \
+						addi	$sp,	$sp, -28; \
+					#endif \
+					bal	C_SYMBOL_NAME(__errno_location@PLT);	\
+					#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+					        addi    $sp,    $sp, 4; \
+					#else \
+						addi	$sp,	$sp, 28; \
+					#endif \
+					pop	$r1;			\
+					swi	$r1, [$r0];				\
+					li		$r0, -1;				\
+					popm	$gp, $lp, $sp;				\
+				1:	ret;
+		#endif
+	#else
+		#ifdef NDS_ABI_V0
+			#define SYSCALL_ERROR_HANDLER	\
+			__local_syscall_error:	push	$lp;				\
+				neg	$r5, $r5;	\
+				push	$r5;				\
+				addi	$sp,	$sp, -28; \
+				bal	C_SYMBOL_NAME(__errno_location);	\
+				addi	$sp,	$sp, 28; \
+				pop	$r1;			\
+				swi	$r1, [$r5];				\
+				li		$r5, -1;				\
+				pop	$lp;				\
+				ret;
+		#else
+			#define SYSCALL_ERROR_HANDLER	\
+			__local_syscall_error:	push	$lp;				\
+				neg	$r0, $r0;	\
+				push	$r0;				\
+				#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+				        addi    $sp,    $sp, -4; \
+				#else \
+					addi	$sp,	$sp, -28; \
+				#endif \
+				bal	C_SYMBOL_NAME(__errno_location);	\
+				#if defined(NDS32_ABI_2) || defined(NDS32_ABI_2FP) \
+				        addi    $sp,    $sp, 4; \
+				#else \
+					addi	$sp,	$sp, 28; \
+				#endif \
+				pop	$r1;			\
+				swi	$r1, [$r0];				\
+				li		$r0, -1;				\
+				pop	$lp;				\
+				ret;
+		#endif
+	#endif
+
+#else
+	#define SYSCALL_ERROR_HANDLER
+	#define SYSCALL_ERROR __syscall_error
+#endif
+#endif	/* __ASSEMBLER__ */
diff --git a/libc/sysdeps/linux/nds32/vfork.S b/libc/sysdeps/linux/nds32/vfork.S
new file mode 100644
index 000000000..c955359fb
--- /dev/null
+++ b/libc/sysdeps/linux/nds32/vfork.S
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <philb@gnu.org>.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+#define _ERRNO_H    1
+
+/* Clone the calling process, but without copying the whole address space.
+   The calling process is suspended until the new process exits or is
+   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,
+   and the process ID of the new process to the old process.  */
+
+ENTRY (__vfork)
+#ifdef PIC
+.pic
+#endif
+
+#ifdef __NR_vfork
+
+    syscall __NR_vfork
+    bltz $r0, 2f
+1:
+    ret
+2:
+    sltsi $r1, $r0, -4096
+    bnez $r1, 1b;
+
+#  ifdef PIC
+	#ifdef __NDS32_N1213_43U1H__
+		! save lp
+		addi	$r2,	$lp,	0
+
+		! set r1 as gp
+		jal	1b
+		sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_)
+		ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+4)
+		add	$r1,	$lp,	$r1
+
+		! restore lp
+		addi	$lp,	$r2,	0
+	#else
+		! set r1 as gp
+		mfusr $r15, $PC
+		sethi	$r1,	hi20(_GLOBAL_OFFSET_TABLE_+4)
+		ori	$r1,	$r1,	lo12(_GLOBAL_OFFSET_TABLE_+8)
+		add	$r1,	$r1,	$r15
+	#endif
+
+	! r15=C_SYMBOL_NAME(__syscall_error)@PLT
+	sethi $r15, hi20(C_SYMBOL_NAME(__syscall_error)@PLT)
+	ori	$r15,	$r15, lo12(C_SYMBOL_NAME(__syscall_error)@PLT)
+	add	$r15, $r15, $r1
+
+	! jump to SYSCALL_ERROR
+	jr		$r15
+#  else
+	j C_SYMBOL_NAME(__syscall_error)
+#  endif
+
+#else
+# error "__NR_vfork not available"
+#endif
+
+PSEUDO_END (__vfork)
+weak_alias (__vfork, vfork)
+libc_hidden_def(vfork)
diff --git a/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
new file mode 100644
index 000000000..f8adf07be
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/nds32/pspinlock.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* POSIX spinlock implementation.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   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; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include "internals.h"
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+	unsigned int		val ;
+	unsigned int		temp ;
+	unsigned int		offset = 0 ;
+
+	__asm__ __volatile__ (
+		"1:\n\t"
+		"llw	%0,	[%1 + %2 << 0]\n\t"
+		"bnez	%0, 1b\n\t"
+		"movi	%3, #0x1\n\t"
+		"scw	%3,	[%1 + %2 << 0]\n\t"
+		"beqz	%3, 1b\n\t"
+		: "=&r" (val)
+		: "r" (lock), "r" (offset), "r" (temp)
+		: "memory" ) ;
+		
+	return 0 ;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+	unsigned int		val ;
+	unsigned int		temp ;
+	unsigned int		offset = 0 ;
+
+	__asm__ __volatile__ (
+		"llw	%0,	[%1 + %2 << 0]\n\t"
+		"bnez	%0, 1f\n\t"
+		"movi	%3, #0x1\n\t"
+		"scw	%3,	[%1 + %2 << 0]\n\t"
+		"beqz	%3, 1f\n\t"
+		"movi	%0, #0x0\n\t"
+		"b	2f\n\t"
+		"1:\n\t"
+		"movi	%0, #16\n\t"
+		"2:\n\t"
+		: "=&r" (val)
+		: "r" (lock), "r" (offset), "r" (temp)
+		: "memory" ) ;
+		
+  return val;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h
new file mode 100644
index 000000000..5bbb9e850
--- /dev/null
+++ b/libpthread/linuxthreads/sysdeps/nds32/pt-machine.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2016 Andes Technology, Inc.
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+/* Machine-dependent pthreads configuration and inline functions.
+   Copyright (C) 1997, 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+   Contributed by Philip Blundell <philb@gnu.org>.
+
+   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; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef _PT_MACHINE_H
+#define _PT_MACHINE_H   1
+
+#include <features.h>
+
+#ifndef PT_EI
+# define PT_EI __extern_always_inline
+#endif
+
+extern long int testandset (int *spinlock);
+extern int __compare_and_swap (long int *p, long int oldval, long int newval);
+
+/* Spinlock implementation; required.  */
+PT_EI long int
+testandset (int *spinlock)
+{
+	unsigned int		val;
+	unsigned int		temp;
+	unsigned int		offset = 0;
+
+	__asm__ __volatile__ (
+		"1:\n\t"
+		"llw	%[val],	[%[spinlock] + %[offset] << 0]\n\t"
+		"move	%[temp], #0x1\n\t"
+		"beq	%[val], %[temp], 2f\n\t"
+		"scw	%[temp], [%[spinlock] + %[offset] << 0]\n\t"
+		"beqz   %[temp], 1b\n\t"
+		"2:\n\t"
+		: [val] "=&r" (val), [temp] "=&r" (temp)
+		: [spinlock] "r" (spinlock), [offset] "r" (offset)
+		: "memory" ) ;
+		
+	return val ;
+}
+
+
+/* Get some notion of the current stack.  Need not be exactly the top
+   of the stack, just something somewhere in the current frame.  */
+#define CURRENT_STACK_FRAME  stack_pointer
+register char * stack_pointer __asm__ ("$sp");
+
+#endif /* pt-machine.h */
diff --git a/librt/spawn.c b/librt/spawn.c
index 07d40193c..79f5b06a7 100644
--- a/librt/spawn.c
+++ b/librt/spawn.c
@@ -20,6 +20,7 @@
 #include <unistd.h>
 #include <signal.h>
 #include <stdbool.h>
+#include <sys/syscall.h>
 #include <fcntl.h>
 
 #include <sys/resource.h>
diff --git a/test/math/libm-test-ulps-nds32 b/test/math/libm-test-ulps-nds32
new file mode 100644
index 000000000..46b2ac559
--- /dev/null
+++ b/test/math/libm-test-ulps-nds32
@@ -0,0 +1,145 @@
+# Begin of automatic generation
+
+# cos
+Test "cos (M_PI_6l * 2.0) == 0.5":
+double: 1
+idouble: 1
+Test "cos (M_PI_6l * 4.0) == -0.5":
+double: 2
+float: 1
+idouble: 2
+ifloat: 1
+
+# erf
+Test "erf (0.75) == 0.711155633653515131598937834591410777":
+double: 1
+idouble: 1
+Test "erf (1.25) == 0.922900128256458230136523481197281140":
+double: 1
+idouble: 1
+
+# erfc
+Test "erfc (4.125) == 0.542340079956506600531223408575531062e-8":
+double: 1
+idouble: 1
+
+# exp
+Test "exp (1) == e":
+double: 1
+idouble: 1
+
+# expm1
+Test "expm1 (0.75) == 1.11700001661267466854536981983709561":
+double: 1
+idouble: 1
+
+# hypot
+Test "hypot (-0.7, -12.4) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (-0.7, 12.4) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (-12.4, -0.7) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (-12.4, 0.7) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (0.7, -12.4) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (0.7, 12.4) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (12.4, -0.7) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+Test "hypot (12.4, 0.7) == 12.419742348374220601176836866763271":
+float: 1
+ifloat: 1
+
+# lgamma
+Test "lgamma (0.7) == 0.260867246531666514385732417016759578":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+Test "lgamma (1.2) == -0.853740900033158497197028392998854470e-1":
+double: 1
+float: 2
+idouble: 1
+ifloat: 2
+
+# log10
+Test "log10 (0.75) == -0.124938736608299953132449886193870744":
+double: 1
+idouble: 1
+Test "log10 (e) == log10(e)":
+float: 1
+ifloat: 1
+
+# tgamma
+Test "tgamma (-0.5) == -2 sqrt (pi)":
+double: 1
+idouble: 1
+Test "tgamma (0.7) == 1.29805533264755778568117117915281162":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+
+# Maximal error of functions:
+Function: "cos":
+double: 2
+float: 1
+idouble: 2
+ifloat: 1
+
+Function: "erf":
+double: 1
+idouble: 1
+
+Function: "erfc":
+double: 1
+idouble: 1
+
+Function: "exp":
+double: 1
+idouble: 1
+
+Function: "expm1":
+double: 1
+idouble: 1
+
+Function: "hypot":
+float: 1
+ifloat: 1
+
+Function: "lgamma":
+double: 1
+float: 2
+idouble: 1
+ifloat: 2
+
+Function: "log":
+float: 1
+ifloat: 1
+
+Function: "log10":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+
+Function: "tan":
+double: 1
+idouble: 1
+
+Function: "tgamma":
+double: 1
+float: 1
+idouble: 1
+ifloat: 1
+
+# end of automatic generation