NPTL: ARC support

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

36 files changed, 1548 insertions, 13 deletions

diff --git a/extra/Configs/defconfigs/arc/defconfig b/extra/Configs/defconfigs/arc/defconfig
index 283565612..23058f353 100644
--- a/extra/Configs/defconfigs/arc/defconfig
+++ b/extra/Configs/defconfigs/arc/defconfig
@@ -6,7 +6,7 @@ KERNEL_HEADERS="%KERNEL_HEADERS%"
 # LDSO_CACHE_SUPPORT is not set
 LDSO_RUNPATH=y
 # LDSO_SAFE_RUNPATH is not set
-LINUXTHREADS_OLD=y
+UCLIBC_HAS_THREADS_NATIVE=y
 PTHREADS_DEBUG_SUPPORT=y
 UCLIBC_SUSV2_LEGACY=y
 UCLIBC_SUSV3_LEGACY=y
diff --git a/include/elf.h b/include/elf.h
index 3bddcdcca..1979209cd 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -3246,7 +3246,17 @@ typedef Elf32_Addr Elf32_Conflict;
 #define R_ARC_GOTOFF		0x39
 #define R_ARC_GOTPC		0x3A
 #define R_ARC_GOT32		0x3B
-#define R_ARC_NUM		0x3C
+
+#define R_ARC_TLS_DTPMOD	0x42
+#define R_ARC_TLS_DTPOFF	0x43
+#define R_ARC_TLS_TPOFF		0x44
+#define R_ARC_TLS_GD_GOT	0x45
+#define R_ARC_TLS_GD_LD	        0x46
+#define R_ARC_TLS_GD_CALL	0x47
+#define R_ARC_TLS_IE_GOT	0x48
+#define R_ARC_TLS_DTPOFF_S9	0x4a
+#define R_ARC_TLS_LE_S9		0x4a
+#define R_ARC_TLS_LE_32		0x4b
 
 #ifdef	__cplusplus
 }
diff --git a/ldso/ldso/arc/dl-debug.h b/ldso/ldso/arc/dl-debug.h
index ff559f27f..6573e5452 100644
--- a/ldso/ldso/arc/dl-debug.h
+++ b/ldso/ldso/arc/dl-debug.h
@@ -65,4 +65,19 @@ static const char *_dl_reltypes_tab[] =
 	"R_ARC_GOTOFF",
 	"R_ARC_GOTPC",
 	"R_ARC_GOT32",
+	"",                     /* 60 */
+	"",
+	"",
+	"",
+	"",
+	"",                     /* 65 */
+        "R_ARC_TLS_DTPMOD",
+        "R_ARC_TLS_DTPOFF",
+        "R_ARC_TLS_TPOFF",
+        "R_ARC_TLS_GD_GOT",
+        "R_ARC_TLS_GD_LD",      /* 70 */
+        "R_ARC_TLS_GD_CALL",
+        "R_ARC_TLS_IE_GOT",
+        "",
+        "",
 };
diff --git a/ldso/ldso/arc/dl-sysdep.h b/ldso/ldso/arc/dl-sysdep.h
index af4b18064..d71e16b32 100644
--- a/ldso/ldso/arc/dl-sysdep.h
+++ b/ldso/ldso/arc/dl-sysdep.h
@@ -96,12 +96,15 @@ extern unsigned __udivmodsi4(unsigned, unsigned) attribute_hidden;
 	})								\
 )
 
-/* 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_PLT iff TYPE describes relocation of a PLT entry or
+   TLS variable 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_ARC_JMP_SLOT) * ELF_RTYPE_CLASS_PLT)	\
+  ((((type) == R_ARC_JMP_SLOT || (type) == R_ARC_TLS_DTPMOD ||	\
+     (type) == R_ARC_TLS_DTPOFF || (type) == R_ARC_TLS_TPOFF)	\
+   * ELF_RTYPE_CLASS_PLT)					\
    | (((type) == R_ARC_COPY) * ELF_RTYPE_CLASS_COPY))
 
 /*
diff --git a/ldso/ldso/arc/elfinterp.c b/ldso/ldso/arc/elfinterp.c
index ca0d2c16f..d26c94705 100644
--- a/ldso/ldso/arc/elfinterp.c
+++ b/ldso/ldso/arc/elfinterp.c
@@ -92,6 +92,7 @@ _dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
 	unsigned long old_val = 0;
 #endif
 	struct symbol_ref sym_ref;
+	struct elf_resolve *tls_tpnt = NULL;
 
 	reloc_addr   = (unsigned long *)(tpnt->loadaddr + rpnt->r_offset);
 	reloc_type   = ELF_R_TYPE(rpnt->r_info);
@@ -118,15 +119,26 @@ _dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
 		 */
 
 		if (unlikely(!symbol_addr
-		    && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK)) {
+		    && ELF_ST_BIND(symtab[symtab_index].st_info) != STB_WEAK
+		    && ELF_ST_TYPE(symtab[symtab_index].st_info) != STT_TLS)) {
 			/* Non-fatal if called from dlopen, hence different ret code */
 			return 1;
 		}
+
+		tls_tpnt = sym_ref.tpnt;
 	} else if (reloc_type == R_ARC_RELATIVE ) {
 		*reloc_addr += tpnt->loadaddr;
 		goto log_entry;
 	}
 
+#if defined USE_TLS && USE_TLS
+	/* In case of a TLS reloc, tls_tpnt NULL means we have an 'anonymous'
+	   symbol.  This is the case for a static tls variable, so the lookup
+	   module is just that one is referencing the tls variable. */
+	if (!tls_tpnt)
+		tls_tpnt = tpnt;
+#endif
+
 	switch (reloc_type) {
 	case R_ARC_32:
 		*reloc_addr += symbol_addr + rpnt->r_addend;
@@ -142,6 +154,18 @@ _dl_do_reloc(struct elf_resolve *tpnt, struct r_scope_elem *scope,
 		_dl_memcpy((void *) reloc_addr,(void *) symbol_addr,
 				symtab[symtab_index].st_size);
 		break;
+#if defined USE_TLS && USE_TLS
+	case R_ARC_TLS_DTPMOD:
+		*reloc_addr = tls_tpnt->l_tls_modid;
+		break;
+	case R_ARC_TLS_DTPOFF:
+		*reloc_addr = symbol_addr;
+		break;
+	case R_ARC_TLS_TPOFF:
+		CHECK_STATIC_TLS ((struct link_map *) tls_tpnt);
+		*reloc_addr = tls_tpnt->l_tls_offset + symbol_addr + rpnt->r_addend;
+		break;
+#endif
 	default:
 		return -1;
 	}
diff --git a/libc/sysdeps/linux/arc/bits/atomic.h b/libc/sysdeps/linux/arc/bits/atomic.h
new file mode 100644
index 000000000..d4abf4eb7
--- /dev/null
+++ b/libc/sysdeps/linux/arc/bits/atomic.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <stdint.h>
+#include <sysdep.h>
+
+typedef int8_t atomic8_t;
+typedef uint8_t uatomic8_t;
+typedef int_fast8_t atomic_fast8_t;
+typedef uint_fast8_t uatomic_fast8_t;
+
+typedef int32_t atomic32_t;
+typedef uint32_t uatomic32_t;
+typedef int_fast32_t atomic_fast32_t;
+typedef uint_fast32_t uatomic_fast32_t;
+
+typedef intptr_t atomicptr_t;
+typedef uintptr_t uatomicptr_t;
+typedef intmax_t atomic_max_t;
+typedef uintmax_t uatomic_max_t;
+
+void __arc_link_error (void);
+
+#define atomic_full_barrier() \
+     __asm__ __volatile__("": : :"memory")
+
+/* Atomic compare and exchange. */
+
+#define __arch_compare_and_exchange_val_8_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_16_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })
+
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval)     \
+  ({									\
+	__typeof(oldval) prev;						\
+									\
+	__asm__ __volatile__(						\
+	"1:	llock   %0, [%1]	\n"				\
+	"	brne    %0, %2, 2f	\n"				\
+	"	scond   %3, [%1]	\n"				\
+	"	bnz     1b		\n"				\
+	"2:				\n"				\
+	: "=&r"(prev)							\
+	: "r"(mem), "ir"(oldval),					\
+	  "r"(newval) /* can't be "ir". scond can't take limm for "b" */\
+	: "cc", "memory");						\
+									\
+	prev;								\
+  })
+
+#define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
+  ({ __arc_link_error (); oldval; })
diff --git a/libc/sysdeps/linux/arc/clone.S b/libc/sysdeps/linux/arc/clone.S
index 9aa8d92cd..db5000caf 100644
--- a/libc/sysdeps/linux/arc/clone.S
+++ b/libc/sysdeps/linux/arc/clone.S
@@ -19,25 +19,32 @@
 ;       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
+; clone syscall in kernel (ABI: CONFIG_CLONE_BACKWARDS)
 ;
-; int sys_clone(unsigned long clone_flags, unsigned long newsp,
-;		int __user *parent_tidptr, void *tls,
+; int sys_clone(unsigned long clone_flags,
+;		unsigned long newsp,
+;		int __user *parent_tidptr,
+;		void *tls,
 ;		int __user *child_tidptr)
 
+#define CLONE_VM		0x00000100
+#define CLONE_THREAD		0x00010000
+#define CLONE_THREAD_N_VM	(CLONE_THREAD | CLONE_VM)
 
 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
+	; save some of the orig args
 	; r0 containg @fn will be clobbered AFTER syscall (with ret val)
-	mov	r10, r0
-	mov	r11, r3
+	; rest are clobbered BEFORE syscall due to different arg ordering
+	mov	r10, r0		; @fn
+	mov	r11, r3		; @args
+	mov	r12, r2		; @clone_flags
 
 	; adjust libc args for syscall
+
 	mov 	r0, r2		; libc @flags is 1st syscall arg
 	mov	r2, r4		; libc @ptid
 	mov	r3, r5		; libc @tls
@@ -49,6 +56,21 @@ ENTRY(clone)
 	blt	.L__sys_err2	; < 0 (signed) error
 	jnz	[blink]		; Parent returns
 
+	; ----- child starts here ---------
+#ifdef RESET_PID
+	mov_s	r2, CLONE_THREAD_N_VM
+	and_s	r2, r2, r12
+	brne	r2, r12, .Lgo_thread
+
+	mov	r8, __NR_clone
+	ARC_TRAP_INSN		; r0 has PID
+	THREAD_SELF r1		; Get to struct pthread (just before TCB)
+	st	r0, [r1, PTHREAD_PID]
+	st	r0, [r1, PTHREAD_TID]
+
+.Lgo_thread:
+#endif
+
 	; child jumps off to @fn with @arg as argument, and returns here
 	jl.d	[r10]
 	mov	r0, r11
diff --git a/libc/sysdeps/linux/arc/jmpbuf-unwind.h b/libc/sysdeps/linux/arc/jmpbuf-unwind.h
index e4ed8fe75..8c41816c5 100644
--- a/libc/sysdeps/linux/arc/jmpbuf-unwind.h
+++ b/libc/sysdeps/linux/arc/jmpbuf-unwind.h
@@ -11,3 +11,20 @@
    containing a local variable at ADDRESS.  */
 #define _JMPBUF_UNWINDS(jmpbuf, address) \
   ((void *) (address) < (void *) (jmpbuf[__JMP_BUF_SP]))
+
+#ifdef __UCLIBC_HAS_THREADS_NATIVE__
+#include <stdint.h>
+#include <unwind.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#undef _JMPBUF_UNWINDS
+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
+  ((void *) (address) < (void *) demangle (jmpbuf[__JMP_BUF_SP]))
+
+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
+  _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
+
+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
+  ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf)[__JMP_BUF_SP] - (_adj))
+#endif
diff --git a/libc/sysdeps/linux/arc/sysdep.h b/libc/sysdeps/linux/arc/sysdep.h
index 76d3788e5..d75d89100 100644
--- a/libc/sysdeps/linux/arc/sysdep.h
+++ b/libc/sysdeps/linux/arc/sysdep.h
@@ -19,4 +19,8 @@ nm:
 
 #include <common/sysdep.h>
 
+/* Pointer mangling is not yet supported  */
+#define PTR_MANGLE(var) (void) (var)
+#define PTR_DEMANGLE(var) (void) (var)
+
 #endif
diff --git a/libc/sysdeps/linux/arc/vfork.S b/libc/sysdeps/linux/arc/vfork.S
index 11959b66b..573a29f26 100644
--- a/libc/sysdeps/linux/arc/vfork.S
+++ b/libc/sysdeps/linux/arc/vfork.S
@@ -16,12 +16,25 @@
 #define CLONE_FLAGS_FOR_VFORK	(CLONE_VM|CLONE_VFORK|SIGCHLD)
 
 ENTRY(__vfork)
+#ifdef SAVE_PID
+	THREAD_SELF r1		; Get to struct pthread (just before TCB)
+	ld	r2, [r1, PTHREAD_PID]
+	neg.f	r3, r2
+	bset.z	r3, r3, 31
+	st	r3, [r1, PTHREAD_PID]
+#endif
 	mov	r0, CLONE_FLAGS_FOR_VFORK
 	mov_s	r1, sp
 	mov	r8, __NR_clone
 	ARC_TRAP_INSN
 
 	cmp	r0, 0
+#ifdef RESTORE_PID
+	bz	1f	; child continues
+	THREAD_SELF r1		; Get to struct pthread (just before TCB)
+	st	r2, [r1, PTHREAD_PID]
+1:
+#endif
 	jge	[blink]	; pid >=0 return, else detour via tailcall to errno
 
 	b   __syscall_error
diff --git a/libpthread/nptl/sysdeps/arc/Makefile.arch b/libpthread/nptl/sysdeps/arc/Makefile.arch
new file mode 100644
index 000000000..1c728847e
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/Makefile.arch
@@ -0,0 +1,13 @@
+# Makefile for uClibc NPTL
+#
+# Copyright (C) 2005 Steven J. Hill <sjhill@uclibc.org>
+#
+# Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+#
+
+CFLAGS-pt-raise.c = -DNOT_IN_libc -DIS_IN_libpthread
+
+ASFLAGS-pthread_spin_lock.S = -DNOT_IN_libc -DIS_IN_libpthread
+ASFLAGS-pthread_spin_trylock.S = -DNOT_IN_libc -DIS_IN_libpthread
+
+libc_arch_a_CSRC = libc-tls.c
diff --git a/libpthread/nptl/sysdeps/arc/dl-tls.h b/libpthread/nptl/sysdeps/arc/dl-tls.h
new file mode 100644
index 000000000..34e54e4d3
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/dl-tls.h
@@ -0,0 +1,28 @@
+/* Thread-local storage handling in the ELF dynamic linker.  ARC version.
+   Copyright (C) 2005 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/>.  */
+
+
+/* Type used for the representation of TLS information in the GOT.  */
+typedef struct
+{
+  unsigned long int ti_module;
+  unsigned long int ti_offset;
+} tls_index;
+
+
+extern void *__tls_get_addr (tls_index *ti);
diff --git a/libpthread/nptl/sysdeps/arc/jmpbuf-unwind.h b/libpthread/nptl/sysdeps/arc/jmpbuf-unwind.h
new file mode 100644
index 000000000..11a043b23
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/jmpbuf-unwind.h
@@ -0,0 +1,32 @@
+/* Copyright (C) 2005,2006 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <setjmp.h>
+#include <stdint.h>
+#include <unwind.h>
+
+/* Test if longjmp to JMPBUF would unwind the frame
+   containing a local variable at ADDRESS.  */
+#undef _JMPBUF_UNWINDS
+#define _JMPBUF_UNWINDS(jmpbuf, address, demangle) \
+  ((void *) (address) < (void *) demangle (jmpbuf[__JMP_BUF_SP]))
+
+#define _JMPBUF_CFA_UNWINDS_ADJ(_jmpbuf, _context, _adj) \
+  _JMPBUF_UNWINDS_ADJ (_jmpbuf, (void *) _Unwind_GetCFA (_context), _adj)
+
+#define _JMPBUF_UNWINDS_ADJ(_jmpbuf, _address, _adj) \
+  ((uintptr_t) (_address) - (_adj) < (uintptr_t) (_jmpbuf)[__JMP_BUF_SP] - (_adj))
diff --git a/libpthread/nptl/sysdeps/arc/libc-tls.c b/libpthread/nptl/sysdeps/arc/libc-tls.c
new file mode 100644
index 000000000..f53ad112e
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/libc-tls.c
@@ -0,0 +1,27 @@
+/*
+ * Thread-local storage handling in statically linked binaries.
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * Based on GNU C Library (file: libc/sysdeps/sh/libc-tls.c)
+ *
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ * Copyright (C) 2010 STMicroelectronics Ltd.
+ *
+ * Author: Filippo Arcidiacono <filippo.arcidiacono@st.com>
+ *
+ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdeps/generic/libc-tls.c>
+#include <dl-tls.h>
+
+#if defined(USE_TLS) && USE_TLS
+
+void *
+__tls_get_addr (tls_index *ti)
+{
+  dtv_t *dtv = THREAD_DTV ();
+  return (char *) dtv[1].pointer.val + ti->ti_offset;
+}
+
+#endif
diff --git a/libpthread/nptl/sysdeps/arc/pthread_spin_lock.S b/libpthread/nptl/sysdeps/arc/pthread_spin_lock.S
new file mode 100644
index 000000000..7a5e630b8
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/pthread_spin_lock.S
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+
+; int pthread_spin_lock(pthread_spinlock_t *lock)
+; 1 - locked, 0 - unlocked
+
+ENTRY(pthread_spin_lock)
+	mov_s	r1, 1
+	nop_s
+1:
+	ex	r1, [r0]
+	breq	r1, 1, 1b
+
+	j.d	[blink]
+	mov	r0, 0
+END(pthread_spin_lock)
diff --git a/libpthread/nptl/sysdeps/arc/pthread_spin_trylock.S b/libpthread/nptl/sysdeps/arc/pthread_spin_trylock.S
new file mode 100644
index 000000000..25f5421a2
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/pthread_spin_trylock.S
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2013 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Licensed under LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sysdep.h>
+
+#define _ERRNO_H 1
+#include <bits/errno.h>
+
+; int pthread_spin_trylock(pthread_spinlock_t *lock)
+; Return EBUSY is already locked, 0 if not
+
+ENTRY(pthread_spin_trylock)
+	mov_s	r1, 1
+	ex	r1, [r0]
+	tst	r1, r1
+	mov.z	r0, 0
+	j.d	[blink]
+	mov.nz	r0, EBUSY
+
+;	slightly faster, but difficult to follow
+;	mov_s	r1, r0
+;	mov_s	r0, 1
+;	ex	r0, [r1]
+;	tst	r0, r0
+;	j.d	[blink]
+;	mov.nz	r0, EBUSY
+
+END(pthread_spin_trylock)
diff --git a/libpthread/nptl/sysdeps/arc/pthreaddef.h b/libpthread/nptl/sysdeps/arc/pthreaddef.h
new file mode 100644
index 000000000..51625e4e6
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/pthreaddef.h
@@ -0,0 +1,40 @@
+/* Copyright (C) 2003 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.  */
+
+#include <sysdep.h>
+
+/* Default stack size.  */
+#define ARCH_STACK_DEFAULT_SIZE	(2 * 1024 * 1024)
+
+/* Required stack pointer alignment at beginning.  */
+#define STACK_ALIGN		8
+
+/* Minimal stack size after allocating thread descriptor and guard size.  */
+#define MINIMAL_REST_STACK	2048
+
+/* Alignment requirement for TCB.  */
+#define TCB_ALIGNMENT		8
+
+
+/* Location of current stack frame.  */
+#define CURRENT_STACK_FRAME	__builtin_frame_address (0)
+
+
+/* XXX Until we have a better place keep the definitions here.  */
+#define __exit_thread_inline(val) \
+  INLINE_SYSCALL (exit, 1, (val))
diff --git a/libpthread/nptl/sysdeps/arc/tcb-offsets.sym b/libpthread/nptl/sysdeps/arc/tcb-offsets.sym
new file mode 100644
index 000000000..cbf0ae42c
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/tcb-offsets.sym
@@ -0,0 +1,8 @@
+#include <sysdep.h>
+#include <tls.h>
+
+PTHREAD_TID		offsetof (struct pthread, tid)
+PTHREAD_PID		offsetof (struct pthread, pid)
+MULTIPLE_THREADS_OFFSET	offsetof (struct pthread, header.multiple_threads)
+TLS_PRE_TCB_SIZE	sizeof (struct pthread)
+TLS_TCB_SIZE            sizeof(tcbhead_t)
diff --git a/libpthread/nptl/sysdeps/arc/tls.h b/libpthread/nptl/sysdeps/arc/tls.h
new file mode 100644
index 000000000..63dd11398
--- /dev/null
+++ b/libpthread/nptl/sysdeps/arc/tls.h
@@ -0,0 +1,160 @@
+/* Definition for thread-local data handling. NPTL/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.
+ */
+
+#ifndef _TLS_H
+#define _TLS_H
+
+#ifndef __ASSEMBLER__
+# include <stdbool.h>
+# include <stddef.h>
+# include <stdint.h>
+# include <stdlib.h>
+# include <list.h>
+# include <sysdep.h>
+# include <bits/kernel-features.h>
+
+/* Type for the dtv.  */
+typedef union dtv
+{
+  size_t counter;
+  struct
+  {
+    void *val;
+    bool is_static;
+  } pointer;
+} dtv_t;
+
+typedef struct
+{
+  dtv_t *dtv;
+  uintptr_t pointer_guard;
+} tcbhead_t;
+
+# define TLS_MULTIPLE_THREADS_IN_TCB 1
+
+#else /* __ASSEMBLER__ */
+# include <tcb-offsets.h>
+
+.macro THREAD_SELF reg
+	# struct pthread is just ahead of TCB
+	sub     \reg, r25, TLS_PRE_TCB_SIZE
+.endm
+
+.macro SET_TP  tcb
+	mov    r25, \tcb
+.endm
+
+#endif /* __ASSEMBLER__ */
+
+
+/* We require TLS support in the tools.  */
+#define HAVE_TLS_SUPPORT
+#define HAVE___THREAD   1
+#define HAVE_TLS_MODEL_ATTRIBUTE       1
+/* Signal that TLS support is available.  */
+# define USE_TLS       1
+
+#ifndef __ASSEMBLER__
+
+/* Get system call information.  */
+# include <sysdep.h>
+
+/* This is the size of the initial TCB.  */
+# define TLS_INIT_TCB_SIZE sizeof (tcbhead_t)
+
+/* Alignment requirements for the initial TCB.  */
+# define TLS_INIT_TCB_ALIGN __alignof__ (tcbhead_t)
+
+/* This is the size of the TCB.  */
+#ifndef TLS_TCB_SIZE
+# define TLS_TCB_SIZE sizeof (tcbhead_t)
+#endif
+
+/* This is the size we need before TCB.  */
+# define TLS_PRE_TCB_SIZE sizeof (struct pthread)
+
+/* Alignment requirements for the TCB.  */
+# define TLS_TCB_ALIGN __alignof__ (struct pthread)
+
+/* The TLS blocks start right after the TCB.  */
+# define TLS_DTV_AT_TP	1
+
+/* Get the thread descriptor definition.  */
+# include <descr.h>
+
+/* Install the dtv pointer.  The pointer passed is to the element with
+   index -1 which contain the length.  */
+# define INSTALL_DTV(tcbp, dtvp) \
+  ((tcbhead_t *) (tcbp))->dtv = (dtvp) + 1
+
+/* Install new dtv for current thread.  */
+# define INSTALL_NEW_DTV(dtv) \
+  (THREAD_DTV() = (dtv))
+
+/* Return dtv of given thread descriptor.  */
+# define GET_DTV(tcbp) \
+  (((tcbhead_t *) (tcbp))->dtv)
+
+/* Code to initially initialize the thread pointer.  This might need
+   special attention since 'errno' is not yet available and if the
+   operation can cause a failure 'errno' must not be touched.  */
+# define TLS_INIT_TP(tcbp, secondcall)          \
+  ({                                            \
+        __builtin_set_thread_pointer(tcbp);     \
+        NULL;                                   \
+   })
+
+/* Return the address of the dtv for the current thread.
+   TP points to TCB where 1st item is dtv pointer */
+# define THREAD_DTV() \
+  (((tcbhead_t *)__builtin_thread_pointer())->dtv)
+
+/* Return the thread descriptor for the current thread.
+   pthread sits right before TCB */
+# define THREAD_SELF \
+  ((struct pthread *)__builtin_thread_pointer() - 1)
+
+/* Magic for libthread_db to know how to do THREAD_SELF.  */
+# define DB_THREAD_SELF \
+  CONST_THREAD_AREA (32, sizeof (struct pthread))
+
+/* Access to data in the thread descriptor is easy.  */
+#define THREAD_GETMEM(descr, member) \
+  descr->member
+#define THREAD_GETMEM_NC(descr, member, idx) \
+  descr->member[idx]
+#define THREAD_SETMEM(descr, member, value) \
+  descr->member = (value)
+#define THREAD_SETMEM_NC(descr, member, idx, value) \
+  descr->member[idx] = (value)
+
+/* Get and set the global scope generation counter in struct pthread.  */
+#define THREAD_GSCOPE_FLAG_UNUSED 0
+#define THREAD_GSCOPE_FLAG_USED   1
+#define THREAD_GSCOPE_FLAG_WAIT   2
+#define THREAD_GSCOPE_RESET_FLAG() \
+  do									     \
+    { int __res								     \
+	= atomic_exchange_rel (&THREAD_SELF->header.gscope_flag,	     \
+			       THREAD_GSCOPE_FLAG_UNUSED);		     \
+      if (__res == THREAD_GSCOPE_FLAG_WAIT)				     \
+	lll_futex_wake (&THREAD_SELF->header.gscope_flag, 1, LLL_PRIVATE);   \
+    }									     \
+  while (0)
+#define THREAD_GSCOPE_SET_FLAG() \
+  do									     \
+    {									     \
+      THREAD_SELF->header.gscop