ARC port to uClibc

For this port, I would like to give due credit to:

- Folks from Codito technologies (Sameer, Amit, Kanika, Ramana,...)
   who did the very first port

- ARC UK from 2007-2009 (Joern, Irfan, Khurram, Phil...

- Late Brendan Kehoe (may he RIP)

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

35 files changed, 1321 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arc/Makefile b/libc/sysdeps/linux/arc/Makefile
new file mode 100644
index 000000000..94b43e117
--- /dev/null
+++ b/libc/sysdeps/linux/arc/Makefile
@@ -0,0 +1,13 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1 or later, 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/arc/Makefile.arch b/libc/sysdeps/linux/arc/Makefile.arch
new file mode 100644
index 000000000..656ea3518
--- /dev/null
+++ b/libc/sysdeps/linux/arc/Makefile.arch
@@ -0,0 +1,11 @@
+# Makefile for uClibc
+#
+# Copyright (C) 2000-2005 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+#
+
+CSRC-y := syscall.c sigaction.c __syscall_error.c cacheflush.c
+
+SSRC-y := sigrestorer.S __longjmp.S setjmp.S bsd-setjmp.S bsd-_setjmp.S \
+	vfork.S clone.S
diff --git a/libc/sysdeps/linux/arc/__longjmp.S b/libc/sysdeps/linux/arc/__longjmp.S
new file mode 100644
index 000000000..91d1852af
--- /dev/null
+++ b/libc/sysdeps/linux/arc/__longjmp.S
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+
+;@ r0 = jump buffer from which regs will be restored
+;@ r1 = value that setjmp( ) will return due to this longjmp
+
+ENTRY(__longjmp)
+
+	ld_s r13, [r0]
+	ld_s r14, [r0,4]
+	ld   r15, [r0,8]
+	ld   r16, [r0,12]
+	ld   r17, [r0,16]
+	ld   r18, [r0,20]
+	ld   r19, [r0,24]
+	ld   r20, [r0,28]
+	ld   r21, [r0,32]
+	ld   r22, [r0,36]
+	ld   r23, [r0,40]
+	ld   r24, [r0,44]
+	ld   r25, [r0,48]
+
+	ld   blink, [r0,60]	; load it early enough to not stall the pipeline
+	ld   fp,    [r0,52]
+	ld   sp,    [r0,56]
+
+	mov.f  r0, r1	; get the setjmp return value(due to longjmp) in place
+
+	j.d    [blink]	; to caller of setjmp location, right after the call
+	mov.z  r0, 1	; can't let setjmp return 0 when it is due to longjmp
+
+END(__longjmp)
+libc_hidden_def(__longjmp)
diff --git a/libc/sysdeps/linux/arc/__syscall_error.c b/libc/sysdeps/linux/arc/__syscall_error.c
new file mode 100644
index 000000000..962d743e4
--- /dev/null
+++ b/libc/sysdeps/linux/arc/__syscall_error.c
@@ -0,0 +1,15 @@
+/* Wrapper for setting errno.
+ *
+ * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <sys/syscall.h>
+
+int __syscall_error(int err_no)
+{
+	__set_errno(-err_no);
+	return -1;
+}
diff --git a/libc/sysdeps/linux/arc/bits/byteswap.h b/libc/sysdeps/linux/arc/bits/byteswap.h
new file mode 100644
index 000000000..75fa3590d
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/byteswap.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ *
+ */
+
+#ifndef _ASM_BITS_BYTESWAP_H
+#define _ASM_BITS_BYTESWAP_H 1
+
+#ifdef __Xswape	/* gcc defined if -mswape is enabled */
+
+#define __bswap_non_constant_32(x)			\
+	__extension__ 					\
+	({ unsigned int __bswap_32_v = x; 		\
+	__asm__ ("swape %0, %0" : "+r" (__bswap_32_v));	\
+	__bswap_32_v; })
+
+#endif	/* __Xswape */
+
+#endif	/* _ASM_BITS_BYTESWAP_H */
+
+#include <bits/byteswap-common.h>
diff --git a/libc/sysdeps/linux/arc/bits/endian.h b/libc/sysdeps/linux/arc/bits/endian.h
new file mode 100755
index 000000000..41163c8ca
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/endian.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+#ifndef _ENDIAN_H
+# error "Never use <bits/endian.h> directly; include <endian.h> instead."
+#endif
+
+/* ARC support either endianness.  */
+#ifdef __BIG_ENDIAN__
+#define __BYTE_ORDER __BIG_ENDIAN
+#else
+#define __BYTE_ORDER __LITTLE_ENDIAN
+#endif
diff --git a/libc/sysdeps/linux/arc/bits/fcntl.h b/libc/sysdeps/linux/arc/bits/fcntl.h
new file mode 100755
index 000000000..71136daee
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/fcntl.h
@@ -0,0 +1,223 @@
+/* O_*, F_*, FD_* bit values for Linux.
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+#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.  */
+#endif
+
+#ifdef __USE_LARGEFILE64
+# define O_LARGEFILE   0100000
+#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
+
+/* 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_XOPEN2K
+# 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.  */
+#endif
+
+/* For F_[GET|SET]FL.  */
+#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/arc/bits/kernel_types.h b/libc/sysdeps/linux/arc/bits/kernel_types.h
new file mode 100755
index 000000000..45aff7d1d
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/kernel_types.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+/* Note that we use the exact same include guard #define names
+ * as asm/posix_types.h.  This will avoid gratuitous conflicts
+ * with the posix_types.h kernel header, and will ensure that
+ * our private content, and not the kernel header, will win.
+ *  -Erik
+ *
+ * Update: ARC Linux 3.2 ABI change - asm-generic/posix_types.h used now.
+ * for which ARCH wrapper (asm/posix_types.h) is generated, so need to use
+ * the asm-generic file's gaurd.
+ *
+ * Based on asm-generic/stat.h
+ */
+
+#ifndef __ASM_GENERIC_POSIX_TYPES_H
+#define __ASM_GENERIC_POSIX_TYPES_H
+
+typedef unsigned long		__kernel_dev_t;
+typedef unsigned long		__kernel_ino_t;
+typedef unsigned int		__kernel_mode_t;
+typedef unsigned int		__kernel_nlink_t;
+typedef long			__kernel_off_t;
+typedef int			__kernel_pid_t;
+typedef int			__kernel_ipc_pid_t;
+typedef unsigned int		__kernel_uid_t;
+typedef unsigned int		__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 __kernel_uid_t		__kernel_uid32_t;
+typedef __kernel_gid_t		__kernel_gid32_t;
+typedef	__kernel_uid_t		__kernel_old_uid_t;
+typedef __kernel_gid_t		__kernel_old_gid_t;
+typedef long long		__kernel_loff_t;
+typedef unsigned int		__kernel_old_dev_t;
+typedef long			__kernel_long_t;
+typedef unsigned long		__kernel_ulong_t;
+
+typedef struct {
+#ifdef __USE_ALL
+	int val[2];
+#else
+	int __val[2];
+#endif
+} __kernel_fsid_t;
+
+#endif /* _ASM_ARC_POSIX_TYPES_H */
diff --git a/libc/sysdeps/linux/arc/bits/setjmp.h b/libc/sysdeps/linux/arc/bits/setjmp.h
new file mode 100644
index 000000000..a8dbdd494
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/setjmp.h
@@ -0,0 +1,16 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _BITS_SETJMP_H
+#define _BITS_SETJMP_H 1
+
+#if !defined _SETJMP_H && !defined _PTHREAD_H
+# error "Never include <bits/setjmp.h> directly; use <setjmp.h> instead."
+#endif
+
+typedef int __jmp_buf[13+1+1+1];    /*r13-r25, fp, sp, blink */
+
+#endif
diff --git a/libc/sysdeps/linux/arc/bits/sigcontextinfo.h b/libc/sysdeps/linux/arc/bits/sigcontextinfo.h
new file mode 100755
index 000000000..ac5cfa966
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/sigcontextinfo.h
@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#define SIGCONTEXT struct sigcontext *
+#define SIGCONTEXT_EXTRA_ARGS
+
+#define GET_PC(ctx)	((void *) ctx->regs.scratch.ret)
+#define GET_FRAME(ctx)	((void *) ctx->regs.scratch.fp)
+#define GET_STACK(ctx)	((void *) ctx->regs.scratch.sp)
+#define CALL_SIGHANDLER(handler, signo, ctx) \
+  (handler)((signo), SIGCONTEXT_EXTRA_ARGS (ctx))
diff --git a/libc/sysdeps/linux/arc/bits/stackinfo.h b/libc/sysdeps/linux/arc/bits/stackinfo.h
new file mode 100755
index 000000000..9d68226b8
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/stackinfo.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _STACKINFO_H
+#define _STACKINFO_H	1
+
+/* On ARC, the stack grows down.  */
+#define _STACK_GROWS_DOWN	1
+
+#endif	/* stackinfo.h */
diff --git a/libc/sysdeps/linux/arc/bits/syscalls.h b/libc/sysdeps/linux/arc/bits/syscalls.h
new file mode 100644
index 000000000..06d2cf926
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/syscalls.h
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, 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>
+
+/*
+ * Fine tuned code for errno handling in syscall wrappers.
+ *
+ * 1. __syscall_error(raw_syscall_ret_val) is used to set the errno (vs.
+ *    the typical __set_errno). This helps elide the generated code for
+ *    GOT fetch for __errno_location pointer etc, in each wrapper.
+ *
+ * 2. The call to above is also disguised in inline asm. This elides
+ *    unconditional save/restore of a few callee regs which gcc almost
+ *    always generates if the call is exposed
+ *
+ * 3. The function can't be hidden because wrappers from librt et all also
+ *    call it. However hidden is not really needed to bypass PLT for
+ *    intra-libc calls as the branch insn w/o @plt is sufficient.
+ */
+
+#ifdef IS_IN_rtld
+/* ldso doesn't have real errno */
+#define ERRNO_ERRANDS(_sys_result)
+#else /* !IS_IN_rtld */
+extern int __syscall_error (int);
+#ifndef IS_IN_libc
+/* Inter-libc callers use PLT */
+#define CALL_ERRNO_SETTER   "bl   __syscall_error@plt    \n\t"
+#else
+/* intra-libc callers, despite PIC can bypass PLT */
+#define CALL_ERRNO_SETTER   "bl   __syscall_error    \n\t"
+#endif
+
+#define ERRNO_ERRANDS(_sys_result)          \
+        __asm__ volatile (                  \
+        "st.a blink, [sp, -4] \n\t"         \
+        CALL_ERRNO_SETTER                   \
+        "ld.ab blink, [sp, 4] \n\t"         \
+        :"+r" (_sys_result)                 \
+        :                                   \
+        :"r1","r2","r3","r4","r5","r6",     \
+         "r7","r8","r9","r10","r11","r12"   \
+        );
+
+#endif /* IS_IN_rtld */
+
+/* Invoke the syscall and return unprocessed kernel status */
+#define INTERNAL_SYSCALL(nm, err, nr, args...)		\
+	INTERNAL_SYSCALL_NCS(SYS_ify (nm), err, nr, args)
+
+/* -1 to -1023 as valid error values will suffice for some time */
+#define INTERNAL_SYSCALL_ERROR_P(val, err)		\
+	((unsigned int) (val) > (unsigned int) -1024)
+
+/*
+ * Standard sycall wrapper:
+ *  -"const" syscall number @nm, sets errno, return success/error-codes
+ */
+#define INLINE_SYSCALL(nm, nr_args, args...)				\
+({									\
+	register int __res __asm__("r0");				\
+	__res = INTERNAL_SYSCALL(nm, , nr_args, args);			\
+	if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P ((__res), ), 0))	\
+	{								\
+		ERRNO_ERRANDS(__res);					\
+	}								\
+	__res;								\
+})
+
+/* Non const syscall number @nm
+ * Ideally this could be folded within INLINE_SYSCALL with
+ * __builtin_constant_p in INTERNAL_SYSCALL but that fails for syscall.c
+ */
+#define INLINE_SYSCALL_NCS(nm, nr_args, args...)			\
+({									\
+	register int __res __asm__("r0");				\
+	__res = INTERNAL_SYSCALL_NCS(nm, , nr_args, args);		\
+	if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P ((__res), ), 0))	\
+	{								\
+		ERRNO_ERRANDS(__res);					\
+	}								\
+	__res;								\
+})
+
+#define INLINE_SYSCALL_NOERR(name, nr, args...)				   \
+  ({ unsigned int _inline_sys_result = INTERNAL_SYSCALL (name, , nr, args);\
+     (int) _inline_sys_result; })
+
+/*-------------------------------------------------------------------------
+ * Mechanics of Trap - specific to ARC700
+ *
+ * Note the memory clobber is not strictly needed for intended semantics of
+ * the inline asm. However some of the cases, such as old-style 6 arg mmap
+ * gcc was generating code for inline syscall ahead of buffer packing needed
+ * for syscall itself.
+ *-------------------------------------------------------------------------*/
+
+#define ARC_TRAP_INSN  "trap0	\n\t"
+
+#define INTERNAL_SYSCALL_NCS(nm, err, nr_args, args...)	\
+({							\
+	/* Per ABI, r0 is 1st arg and return reg */	\
+	register int __ret __asm__("r0");		\
+	register int _sys_num __asm__("r8");		\
+							\
+	LOAD_ARGS_##nr_args (nm, args)			\
+							\
+        __asm__ volatile (				\
+		ARC_TRAP_INSN				\
+		: "+r" (__ret)				\
+		: "r"(_sys_num) ASM_ARGS_##nr_args	\
+		: "memory");				\
+                                                        \
+	__ret;						\
+})
+
+/* Macros for setting up inline __asm__ input regs */
+#define ASM_ARGS_0
+#define ASM_ARGS_1	ASM_ARGS_0, "r" (__ret)
+#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(nm, arg)					\
+	_sys_num = (int) (nm);					\
+
+#define LOAD_ARGS_1(nm, arg1) 					\
+	__ret = (int) (arg1);					\
+	LOAD_ARGS_0 (nm, 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(nm, arg1, arg2)				\
+	int _tmp2 = (int) (arg2);				\
+	LOAD_ARGS_1 (nm, arg1)					\
+	register int _arg2 __asm__ ("r1") = _tmp2;
+
+#define LOAD_ARGS_3(nm, arg1, arg2, arg3)			\
+	int _tmp3 = (int) (arg3);				\
+	LOAD_ARGS_2 (nm, arg1, arg2)				\
+	register int _arg3 __asm__ ("r2") = _tmp3;
+
+#define LOAD_ARGS_4(nm, arg1, arg2, arg3, arg4)			\
+	int _tmp4 = (int) (arg4);				\
+	LOAD_ARGS_3 (nm, arg1, arg2, arg3)			\
+	register int _arg4 __asm__ ("r3") = _tmp4;
+
+#define LOAD_ARGS_5(nm, arg1, arg2, arg3, arg4, arg5)		\
+	int _tmp5 = (int) (arg5);				\
+	LOAD_ARGS_4 (nm, arg1, arg2, arg3, arg4)		\
+	register int _arg5 __asm__ ("r4") = _tmp5;
+
+#define LOAD_ARGS_6(nm,  arg1, arg2, arg3, arg4, arg5, arg6)	\
+	int _tmp6 = (int) (arg6);				\
+	LOAD_ARGS_5 (nm, arg1, arg2, arg3, arg4, arg5)		\
+	register int _arg6 __asm__ ("r5") = _tmp6;
+
+#define LOAD_ARGS_7(nm, arg1, arg2, arg3, arg4, arg5, arg6, arg7)\
+	int _tmp7 = (int) (arg7);				\
+	LOAD_ARGS_6 (nm, arg1, arg2, arg3, arg4, arg5, arg6)	\
+	register int _arg7 __asm__ ("r6") = _tmp7;
+
+#else
+
+#define ARC_TRAP_INSN	trap0
+
+#endif /* __ASSEMBLER__ */
+
+#endif /* _BITS_SYSCALLS_H */
diff --git a/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
new file mode 100755
index 000000000..9313ee8f2
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/uClibc_arch_features.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, 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 */
+#define __UCLIBC_ABORT_INSTRUCTION__ "flag 0"
+
+/* can your target use syscall6() for mmap ? */
+#undef __UCLIBC_MMAP_HAS_6_ARGS__
+
+/* does your target use syscall4() for truncate64 ? (32bit arches only) */
+#undef __UCLIBC_TRUNCATE64_HAS_4_ARGS__
+
+/* 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 doesn't like .global */
+#undef __UCLIBC_ASM_GLOBAL_DIRECTIVE__
+
+/* define if target supports .weak */
+#define __UCLIBC_HAVE_ASM_WEAK_DIRECTIVE__
+
+/* define if target supports .weakext */
+#undef __UCLIBC_HAVE_ASM_WEAKEXT_DIRECTIVE__
+
+/* needed probably only for ppc64 */
+#undef __UCLIBC_HAVE_ASM_GLOBAL_DOT_NAME__
+
+/* define if target supports CFI pseudo ops */
+#undef __UCLIBC_HAVE_ASM_CFI_DIRECTIVES__
+
+/* define if target supports IEEE signed zero floats */
+#define __UCLIBC_HAVE_SIGNED_ZERO__
+
+/* The default ';' is a comment on ARC. */
+#define __UCLIBC_ASM_LINE_SEP__ `
+
+#endif /* _BITS_UCLIBC_ARCH_FEATURES_H */
diff --git a/libc/sysdeps/linux/arc/bits/uClibc_page.h b/libc/sysdeps/linux/arc/bits/uClibc_page.h
new file mode 100755
index 000000000..26cec54c9
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/uClibc_page.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _UCLIBC_PAGE_H
+#define _UCLIBC_PAGE_H
+
+/*
+ * ARC700/linux supports 4k, 8k, 16k pages (build time).
+ * We rely on the kernel exported header (aka uapi headers since 3.8)
+ * for PAGE_SIZE and friends. This avoids hand-editing here when building
+ * toolchain.
+ *
+ * Although uClibc determines page size dynamically, from kernel's auxv which
+ * ARC Linux does pass, still the generic code needs a fall back
+ *  _dl_pagesize = auxvt[AT_PAGESZ].a_un.a_val ? : PAGE_SIZE
+ *
+ */
+#include <asm/page.h>
+
+/* 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/arc/bits/wordsize.h b/libc/sysdeps/linux/arc/bits/wordsize.h
new file mode 100755
index 000000000..c7480332c
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/wordsize.h
@@ -0,0 +1,7 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#define __WORDSIZE	32
diff --git a/libc/sysdeps/linux/arc/bsd-_setjmp.S b/libc/sysdeps/linux/arc/bsd-_setjmp.S
new file mode 100644
index 000000000..d166cb8ca
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bsd-_setjmp.S
@@ -0,0 +1,20 @@
+/* BSD `_setjmp' entry point to `sigsetjmp (..., 0)'.  ARC version.
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, 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>
+
+;@ r0 = jump buffer into which regs will be saved
+
+ENTRY(_setjmp)
+	b.d	__sigsetjmp
+	mov	r1, 0		; don't save signals
+END(_setjmp)
+libc_hidden_def(_setjmp)
diff --git a/libc/sysdeps/linux/arc/bsd-setjmp.S b/libc/sysdeps/linux/arc/bsd-setjmp.S
new file mode 100644
index 000000000..46745958e
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bsd-setjmp.S
@@ -0,0 +1,20 @@
+/* BSD `setjmp' entry point to `sigsetjmp (..., 1)'.  ARC version.
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, 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>
+
+;@ r0 = jump buffer into which regs will be saved
+
+ENTRY(setjmp)
+	b.d	__sigsetjmp
+	mov	r1, 1		; save signals
+END(setjmp)
+libc_hidden_def(setjmp)
diff --git a/libc/sysdeps/linux/arc/cacheflush.c b/libc/sysdeps/linux/arc/cacheflush.c
new file mode 100644
index 000000000..d33353d83
--- /dev/null
+++ b/libc/sysdeps/linux/arc/cacheflush.c
@@ -0,0 +1,11 @@
+/* cacheflush syscall for ARC
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sys/cachectl.h>
+
+_syscall3(int, cacheflush, void *, addr, int, nbytes, int, op)
diff --git a/libc/sysdeps/linux/arc/clone.S b/libc/sysdeps/linux/arc/clone.S
new file mode 100644
index 000000000..79ebd065a
--- /dev/null
+++ b/libc/sysdeps/linux/arc/clone.S
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <asm/errno.h>
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+; Per man, libc clone( ) is as follows
+;
+; int clone(int (*fn)(void *), void *child_stack,
+;           int flags, void *arg, ...
+;           /* pid_t *ptid, struct user_desc *tls, pid_t *ctid */);
+;
+; NOTE: I'm assuming that the last 3 args are NOT var-args and in case all
+;	3 are not relevant, caller will nevertheless pass those as NULL.
+;       Current (Jul 2012) upstream powerpc/clone.S assumes similarly.
+;	Our LTP (from 2007) doesn't seem to have tests to prove otherwise
+
+; clone syscall in kernel
+;
+; int sys_clone(unsigned long clone_flags, unsigned long newsp,
+;		int __user *parent_tidptr, void *tls,
+;		int __user *child_tidptr)
+
+
+ENTRY(clone)
+	cmp	r0, 0		; @fn can't be NULL
+	cmp.ne	r1, 0		; @child_stack can't be NULL
+	bz	.L__sys_err
+
+	; @fn and @args needed after the syscall for child
+	; However r3 containing @arg will be clobbered BEFORE syscall
+	; r0 containg @fn will be clobbered AFTER syscall (with ret val)
+	mov	r10, r0
+	mov	r11, r3
+
+	; adjust libc args for syscall
+	mov 	r0, r2		; libc @flags is 1st syscall arg
+	mov	r2, r4		; libc @ptid
+	mov	r3, r5		; libc @tls
+	mov	r4, r6		; libc @ctid
+	mov	r8, __NR_clone
+	ARC_TRAP_INSN
+
+	cmp	r0, 0		; return code : 0 new process, !0 parent
+	blt	.L__sys_err2	; < 0 (signed) error
+	jnz	[blink]		; Parent returns
+
+	; child jumps off to @fn with @arg as argument
+	j.d	[r10]
+	mov	r0, r11
+
+	; falls thru to _exit() with result from @fn (already in r0)
+	b	HIDDEN_JUMPTARGET(_exit)
+
+.L__sys_err:
+	mov	r0, -EINVAL
+.L__sys_err2:
+	; (1) No need to make -ve kernel error code as positive errno
+	;   __syscall_error expects the -ve error code returned by kernel
+	; (2) r0 still had orig -ve kernel error code
+	; (3) Tail call to __syscall_error so we dont have to come back
+	;     here hence instead of jmp-n-link (reg push/pop) we do jmp
+	; (4) No need to route __syscall_error via PLT, B is inherently
+	;     position independent
+	b   __syscall_error
+END(clone)
+libc_hidden_def(clone)
diff --git a/libc/sysdeps/linux/arc/crt1.S b/libc/sysdeps/linux/arc/crt1.S
new file mode 100644
index 000000000..d78a96dcc
--- /dev/null
+++ b/libc/sysdeps/linux/arc/crt1.S
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <sysdep.h>
+
+.text
+
+#ifndef __UCLIBC_CTOR_DTOR__
+	.weak	_init
+	.weak	_fini
+#endif
+
+/* Stick in a dummy reference to main(), so that if an application
+ * is linking when the main() function is in a static library (.a)
+ * we can be sure that main() actually gets linked in
+ */
+	.type	main,@function
+	.type	_main,@function
+
+
+/* When we enter this piece of code, the program stack looks like this:
+        argc            argument counter (integer)
+        argv[0]         program name (pointer)
+        argv[1...N]     program args (pointers)
+        argv[argc-1]    end of args (integer)
+	NULL
+        env[0...N]      environment variables (pointers)
+        NULL
+*/
+ENTRY(__start)
+	mov	fp, 0
+	ld_s	r1, [sp]	; argc
+
+	mov_s	r5, r0		; rltd_fini
+	add_s	r2, sp, 4	; argv
+
+	mov_s	r0, main
+	mov_s	r3, _init
+	mov	r4, _fini
+
+	and	sp, sp, -8
+	mov	r6, sp
+
+	/* __uClibc_main (main, argc, argv, init, fini, rtld_fini, stack_end) */
+	bl	__uClibc_main
+
+	/* Should never get here....  */
+	flag    1
+END(__start)
+libc_hidden_def(__start)
diff --git a/libc/sysdeps/linux/arc/crti.S b/libc/sysdeps/linux/arc/crti.S
new file mode 100644
index 000000000..da8fc2a2a
--- /dev/null
+++ b/libc/sysdeps/linux/arc/crti.S
@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+___gnu_compiled_c:
+
+	.section .init
+	.align 4
+	.global	_init
+	.type	 _init,@function
+_init:
+	st.a blink,[sp,-4]
+	st.a fp,[sp,-4]
+	mov fp,sp
+
+
+	.section .fini
+	.align 4
+	.global	_fini
+	.type	 _fini,@function
+_fini:
+	st.a blink,[sp,-4]
+	st.a fp,[sp,-4]
+	mov fp,sp
+	.align 4
diff --git a/libc/sysdeps/linux/arc/crtn.S b/libc/sysdeps/linux/arc/crtn.S
new file mode 100644
index 000000000..f507080b3
--- /dev/null
+++ b/libc/sysdeps/linux/arc/crtn.S
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+___gnu_compiled_c:
+
+	.section .init
+	.align 4
+	.global	_init
+	.type	 _init,@function
+	; EPILOGUE
+	ld.ab fp,[sp,4]
+	ld blink,[sp,0]
+	j.d [blink]
+	add sp,sp,4
+;	.size	 _init,.-_init
+
+	.section .fini
+	.align 4
+	.global	_fini
+	.type	 _fini,@function
+	; EPILOGUE
+	ld.ab fp,[sp,4]
+	ld blink,[sp,0]
+	j.d [blink]
+	add sp,sp,4
+;	.size	 _fini,.-_fini
diff --git a/libc/sysdeps/linux/arc/jmpbuf-offsets.h b/libc/sysdeps/linux/arc/jmpbuf-offsets.h
new file mode 100644
index 000000000..314e03110
--- /dev/null
+++ b/libc/sysdeps/linux/arc/jmpbuf-offsets.h
@@ -0,0 +1,7 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#define __JMP_BUF_SP 	(13+1)
diff --git a/libc/sysdeps/linux/arc/jmpbuf-unwind.h b/libc/sysdeps/linux/arc/jmpbuf-unwind.h
new file mode 100644
index 000000000..e4ed8fe75
--- /dev/null
+++ b/libc/sysdeps/linux/arc/jmpbuf-unwind.h
@@ -0,0 +1,13 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, 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[__JMP_BUF_SP]))
diff --git a/libc/sysdeps/linux/arc/setjmp.S b/libc/sysdeps/linux/arc/setjmp.S
new file mode 100644
index 000000000..b6a65f579
--- /dev/null
+++ b/libc/sysdeps/linux/arc/setjmp.S
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+
+;@ r0 = jump buffer into which regs will be saved
+;@ r1 = do we need to save signals
+
+ENTRY(__sigsetjmp)
+
+	st_s r13, [r0]
+	st_s r14, [r0,4]
+	st   r15, [r0,8]
+	st   r16, [r0,12]
+	st   r17, [r0,16]
+	st   r18, [r0,20]
+	st   r19, [r0,24]
+	st   r20, [r0,28]
+	st   r21, [r0,32]
+	st   r22, [r0,36]
+	st   r23, [r0,40]
+	st   r24, [r0,44]
+	st   r25, [r0,48]
+	st   fp,  [r0,52]
+	st   sp,  [r0,56]
+
+	; make a note of where longjmp will return to.
+	; that will be right next to this setjmp call-site which will be
+	; contained in blink, since "C" caller of this routine will do
+	; a branch-n-link
+
+	st   blink, [r0,60]
+	b    __sigjmp_save
+
+END(__sigsetjmp)
+libc_hidden_def(__sigsetjmp)
diff --git a/libc/sysdeps/linux/arc/sigaction.c b/libc/sysdeps/linux/arc/sigaction.c
new file mode 100644
index 000000000..a4bc5f34b
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sigaction.c
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <errno.h>
+#include <signal.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <bits/kernel_sigaction.h>
+
+extern void __default_rt_sa_restorer(void);
+//libc_hidden_proto(__default_rt_sa_restorer);
+
+#define SA_RESTORER	0x04000000
+
+/* If @act is not NULL, change the action for @sig to @act.
+   If @oact is not NULL, put the old action for @sig in @oact.  */
+int
+__libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact)
+{
+	struct sigaction kact;
+
+	/* !act means caller only wants to know @oact
+	 * Hence only otherwise, do SA_RESTORER stuff
+	 *
+	 * For the normal/default cases (user not providing SA_RESTORER) use
+	 * a real sigreturn stub to avoid kernel synthesizing one on user stack
+	 * at runtime, which needs PTE permissions update (hence TLB entry
+	 * update) and costly cache line flushes for code modification
+	 */
+	if (act && !(act->sa_flags & SA_RESTORER)) {
+		memcpy(&kact, act, sizeof(kact));
+		kact.sa_restorer = __default_rt_sa_restorer;
+		kact.sa_flags |= SA_RESTORER;
+
+		act = &kact;
+	}
+
+	return __syscall_rt_sigaction(sig, act, oact, sizeof(act->sa_mask));
+}
+
+#ifndef LIBC_SIGACTION
+weak_alias(__libc_sigaction,sigaction)
+libc_hidden_weak(sigaction)
+#endif
diff --git a/libc/sysdeps/linux/arc/sigrestorer.S b/libc/sysdeps/linux/arc/sigrestorer.S
new file mode 100644
index 000000000..24531d89d
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sigrestorer.S
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+#include <sys/syscall.h>
+
+/*
+ * Provide a real sigreturn stub to avoid kernel synthesizing one
+ * on user stack at runtime, which needs PTE permissions update
+ * (hence TLB entry update) and costly cache line flushes for
+ * code modification
+ */
+
+ENTRY(__default_rt_sa_restorer)
+    mov r8, __NR_rt_sigreturn
+    ARC_TRAP_INSN
+END(__default_rt_sa_restorer)
+libc_hidden_def(__default_rt_sa_restorer)
diff --git a/libc/sysdeps/linux/arc/sys/cachectl.h b/libc/sysdeps/linux/arc/sys/cachectl.h
new file mode 100644
index 000000000..e9a783bdc
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sys/cachectl.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _SYS_CACHECTL_H
+#define _SYS_CACHECTL_H	1
+
+/*
+ * Get the kernel definition for the flag bits
+ */
+#include <asm/cachectl.h>
+
+__BEGIN_DECLS
+
+extern int cacheflush(void *addr, int nbytes, int flags);
+
+__END_DECLS
+
+#endif	/* sys/cachectl.h */
diff --git a/libc/sysdeps/linux/arc/sys/procfs.h b/libc/sysdeps/linux/arc/sys/procfs.h
new file mode 100755
index 000000000..44676e197
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sys/procfs.h
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#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 20
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+/* 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_gregset_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/arc/sys/ucontext.h b/libc/sysdeps/linux/arc/sys/ucontext.h
new file mode 100755
index 000000000..23d928562
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sys/ucontext.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#ifndef _SYS_UCONTEXT_H
+#define _SYS_UCONTEXT_H	1
+
+#include <features.h>
+#include <signal.h>
+#include <bits/sigcontext.h>
+
+typedef struct ucontext {
+	unsigned long	  uc_flags;
+	struct ucontext  *uc_link;
+	stack_t		  uc_stack;
+	struct sigcontext uc_mcontext;
+	sigset_t	  uc_sigmask;	/* mask last for extensibility */
+} ucontext_t;
+
+#endif /* sys/ucontext.h */
diff --git a/libc/sysdeps/linux/arc/sys/user.h b/libc/sysdeps/linux/arc/sys/user.h
new file mode 100755
index 000000000..e340074ce
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sys/user.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#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.  */
+
+
+/* Actually apps like strace also expect a struct user, so it's better to
+ * have a dummy implementation
+ */
+
+struct user {
+	int dummy;
+};
+
+#endif  /* sys/user.h */
diff --git a/libc/sysdeps/linux/arc/syscall.c b/libc/sysdeps/linux/arc/syscall.c
new file mode 100644
index 000000000..5648b0e1f
--- /dev/null
+++ b/libc/sysdeps/linux/arc/syscall.c
@@ -0,0 +1,17 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <features.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/syscall.h>
+
+extern long syscall(long int sysnum, long a, long b, long c, long d, long e, long f);
+
+long syscall(long int sysnum, long a, long b, long c, long d, long e, long f)
+{
+	return INLINE_SYSCALL_NCS(sysnum, 6, a, b, c, d, e, f);
+}
diff --git a/libc/sysdeps/linux/arc/sysdep.h b/libc/sysdeps/linux/arc/sysdep.h
new file mode 100644
index 000000000..76d3788e5
--- /dev/null
+++ b/libc/sysdeps/linux/arc/sysdep.h
@@ -0,0 +1,22 @@
+#ifndef _LINUX_ARC_SYSDEP_H
+#define _LINUX_ARC_SYSDEP_H 1
+
+#include <features.h>
+#include <libc-internal.h>
+
+#ifdef	__ASSEMBLER__
+
+#define ENTRY(nm)		\
+	.text `			\
+	.align 4 `		\
+	.globl nm `		\
+	.type nm,@function `	\
+nm:
+
+#define END(name)	.size name,.-name
+
+#endif /* __ASSEMBLER __*/
+
+#include <common/sysdep.h>
+
+#endif
diff --git a/libc/sysdeps/linux/arc/vfork.S b/libc/sysdeps/linux/arc/vfork.S
new file mode 100644
index 000000000..542239fb8
--- /dev/null
+++ b/libc/sysdeps/linux/arc/vfork.S
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <sysdep.h>
+
+/* No legacy syscall ABI means NR_vfork is not available at all, use clone */
+#define _SIGNAL_H
+#include <bits/signum.h>       /* For SIGCHLD */
+
+#define CLONE_VM		0x00000100
+#define CLONE_VFORK		0x00004000
+#define CLONE_FLAGS_FOR_VFORK	(CLONE_VM|CLONE_VFORK|SIGCHLD)
+
+ENTRY(vfork)
+	mov	r0, CLONE_FLAGS_FOR_VFORK
+	mov_s	r1, sp
+	mov	r8, __NR_clone
+	ARC_TRAP_INSN
+
+	cmp	r0, 0
+	jge	[blink]	; pid >=0 return, else detour via tailcall to errno
+
+	b   __syscall_error
+END(vfork)
+libc_hidden_def(vfork)
diff --git a/libc/sysdeps/linux/arc/xstatconv.c b/libc/sysdeps/linux/arc/xstatconv.c
new file mode 100644
index 000000000..d7948c075
--- /dev/null
+++ b/libc/sysdeps/linux/arc/xstatconv.c
@@ -0,0 +1 @@
+/* We don't need any of this.  */