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>

11 files changed, 642 insertions, 0 deletions

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