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Re: [PATCH 1/3] PowerPC: Add the low level infrastructure for pthreads
- From: Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>
- To: libc-alpha at sourceware dot org
- Cc: Segher Boessenkool <segher at kernel dot crashing dot org>
- Date: Mon, 10 Nov 2014 19:20:18 -0200
- Subject: Re: [PATCH 1/3] PowerPC: Add the low level infrastructure for pthreads
- Authentication-results: sourceware.org; auth=none
- References: <545CFD9F dot 5040004 at linux dot vnet dot ibm dot com> <545D080D dot 3090006 at linux dot vnet dot ibm dot com> <545D1DDE dot 2060908 at linux dot vnet dot ibm dot com> <20141108030534 dot GA24941 at gate dot crashing dot org>
On 08-11-2014 01:05, Segher Boessenkool wrote:
> On Fri, Nov 07, 2014 at 05:30:38PM -0200, Adhemerval Zanella wrote:
>> +static __force_inline
>> +unsigned int _tbegin (void)
>> +{
>> + unsigned int ret;
>> + asm volatile (
>> + TBEGIN "\t\n"
>> + "mfcr %0,128\t\n"
>> + "rlwinm %0,%0,3,1\t\n"
>> + "subfic %0,%0,1\t\n"
>> + : "=r" (ret) :: "cr0", "memory");
>> + return ret;
>> +}
> This needs a "xer" clobber because you use subfic (which sets XER[CA]).
> Better is to not use subfic, but instead e.g. "xori %0,%0,1".
>
>
> Segher
>
Thanks, I have updated the patch. Tested on a power8 with GCC 4.9 (that have
support for HTM builtins) and GCC 4.8 (which does not).
--
diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile
index e660736..dd5d3bc 100644
--- a/sysdeps/unix/sysv/linux/powerpc/Makefile
+++ b/sysdeps/unix/sysv/linux/powerpc/Makefile
@@ -32,4 +32,6 @@ endif
ifeq ($(subdir),nptl)
libpthread-routines += sysdep
+libpthread-sysdep_routines += elision-lock elision-unlock elision-timed \
+ elision-trylock
endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h b/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
index 4e9c518..396a3d9 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h
@@ -90,14 +90,23 @@ typedef union
binary compatibility. */
int __kind;
#if __WORDSIZE == 64
- int __spins;
+ short __spins;
+ short __elision;
__pthread_list_t __list;
# define __PTHREAD_MUTEX_HAVE_PREV 1
+# define __PTHREAD_SPINS 0, 0
#else
unsigned int __nusers;
__extension__ union
{
- int __spins;
+ struct
+ {
+ short __espins;
+ short __elision;
+# define __spins __elision_data.__espins
+# define __elision __elision_data.__elision
+# define __PTHREAD_SPINS { 0, 0 }
+ } __elision_data;
__pthread_slist_t __list;
};
#endif
@@ -106,9 +115,6 @@ typedef union
long int __align;
} pthread_mutex_t;
-/* Mutex __spins initializer used by PTHREAD_MUTEX_INITIALIZER. */
-#define __PTHREAD_SPINS 0
-
typedef union
{
char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-conf.c b/sysdeps/unix/sysv/linux/powerpc/elision-conf.c
new file mode 100644
index 0000000..60a7900
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-conf.c
@@ -0,0 +1,81 @@
+/* elision-conf.c: Lock elision tunable parameters.
+ Copyright (C) 2014 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 "config.h"
+#include <pthreadP.h>
+#include <elision-conf.h>
+#include <unistd.h>
+#include <dl-procinfo.h>
+
+/* Reasonable initial tuning values, may be revised in the future.
+ This is a conservative initial value. */
+
+struct elision_config __elision_aconf =
+ {
+ /* How often to not attempt to use elision if a transaction aborted
+ because the lock is already acquired. Expressed in number of lock
+ acquisition attempts. */
+ .skip_lock_busy = 3,
+ /* How often to not attempt to use elision if a transaction aborted due
+ to reasons other than other threads' memory accesses. Expressed in
+ number of lock acquisition attempts. */
+ .skip_lock_internal_abort = 3,
+ /* How often to not attempt to use elision if a lock used up all retries
+ without success. Expressed in number of lock acquisition attempts. */
+ .skip_lock_out_of_tbegin_retries = 3,
+ /* How often we retry using elision if there is chance for the transaction
+ to finish execution (e.g., it wasn't aborted due to the lock being
+ already acquired. */
+ .try_tbegin = 3,
+ /* Same as SKIP_LOCK_INTERNAL_ABORT but for trylock. */
+ .skip_trylock_internal_abort = 3,
+ };
+
+/* Force elision for all new locks. This is used to decide whether existing
+ DEFAULT locks should be automatically upgraded to elision in
+ pthread_mutex_lock(). Disabled for suid programs. Only used when elision
+ is available. */
+
+int __pthread_force_elision attribute_hidden;
+
+/* Initialize elison. */
+
+static void
+elision_init (int argc __attribute__ ((unused)),
+ char **argv __attribute__ ((unused)),
+ char **environ)
+{
+ int elision_available = (GLRO (dl_hwcap2) & PPC_FEATURE2_HAS_HTM) ? 1 : 0;
+#ifdef ENABLE_LOCK_ELISION
+ __pthread_force_elision = __libc_enable_secure ? 0 : elision_available;
+#endif
+}
+
+#ifdef SHARED
+# define INIT_SECTION ".init_array"
+# define MAYBE_CONST
+#else
+# define INIT_SECTION ".preinit_array"
+# define MAYBE_CONST const
+#endif
+
+void (*MAYBE_CONST __pthread_init_array []) (int, char **, char **)
+ __attribute__ ((section (INIT_SECTION), aligned (sizeof (void *)))) =
+{
+ &elision_init
+};
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-conf.h b/sysdeps/unix/sysv/linux/powerpc/elision-conf.h
new file mode 100644
index 0000000..333226a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-conf.h
@@ -0,0 +1,43 @@
+/* elision-conf.h: Lock elision tunable parameters.
+ Copyright (C) 2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _ELISION_CONF_H
+#define _ELISION_CONF_H 1
+
+#include <pthread.h>
+#include <time.h>
+
+/* Should make sure there is no false sharing on this. */
+
+struct elision_config
+{
+ int skip_lock_busy;
+ int skip_lock_internal_abort;
+ int skip_lock_out_of_tbegin_retries;
+ int try_tbegin;
+ int skip_trylock_internal_abort;
+};
+
+extern struct elision_config __elision_aconf attribute_hidden;
+
+extern int __pthread_force_elision attribute_hidden;
+
+/* Tell the test suite to test elision for this architecture. */
+#define HAVE_ELISION 1
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-lock.c b/sysdeps/unix/sysv/linux/powerpc/elision-lock.c
new file mode 100644
index 0000000..c5a4eca
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-lock.c
@@ -0,0 +1,106 @@
+/* elision-lock.c: Elided pthread mutex lock.
+ Copyright (C) 2014 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 <stdio.h>
+#include <pthread.h>
+#include <pthreadP.h>
+#include <lowlevellock.h>
+#include <elision-conf.h>
+#include "htm.h"
+
+/* PowerISA 2.0.7 Section B.5.5 defines isync to be isuficient to memory
+ barrier in acquire mechanism, a strong sync need to used. */
+#undef __arch_compare_and_exchange_val_32_acq
+#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
+ ({ \
+ __typeof (*(mem)) __tmp; \
+ __typeof (mem) __memp = (mem); \
+ __asm __volatile ( \
+ "1: lwarx %0,0,%1" MUTEX_HINT_ACQ "\n" \
+ " cmpw %0,%2\n" \
+ " bne 2f\n" \
+ " stwcx. %3,0,%1\n" \
+ " bne- 1b\n" \
+ "2: sync" \
+ : "=&r" (__tmp) \
+ : "b" (__memp), "r" (oldval), "r" (newval) \
+ : "cr0", "memory"); \
+ __tmp; \
+ })
+
+#if !defined(LLL_LOCK) && !defined(EXTRAARG)
+/* Make sure the configuration code is always linked in for static
+ libraries. */
+#include "elision-conf.c"
+#endif
+
+#ifndef EXTRAARG
+# define EXTRAARG
+#endif
+#ifndef LLL_LOCK
+# define LLL_LOCK(a,b) lll_lock(a,b), 0
+#endif
+
+#define aconf __elision_aconf
+
+/* Adaptive lock using transactions.
+ By default the lock region is run as a transaction, and when it
+ aborts or the lock is busy the lock adapts itself. */
+
+int
+__lll_lock_elision (int *lock, short *adapt_count, EXTRAARG int pshared)
+{
+ if (*adapt_count > 0)
+ {
+ (*adapt_count)--;
+ goto use_lock;
+ }
+
+ int try_begin = aconf.try_tbegin;
+ while (1)
+ {
+ if (__builtin_tbegin (0))
+ {
+ if (*lock == 0)
+ return 0;
+ /* Lock was busy. Fall back to normal locking. */
+ __builtin_tabort (_ABORT_LOCK_BUSY);
+ }
+ else
+ {
+ /* A persistent failure indicates that a retry will probably
+ result in another failure. Use normal locking now and
+ for the next couple of calls. */
+ if (try_begin-- <= 0
+ || _TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ()))
+ {
+ if (aconf.skip_lock_internal_abort > 0)
+ *adapt_count = aconf.skip_lock_internal_abort;
+ goto use_lock;
+ }
+ /* Same logic as above, but for for a number of temporary failures
+ in a row. */
+ else if (aconf.skip_lock_out_of_tbegin_retries > 0
+ && aconf.try_tbegin > 0)
+ *adapt_count = aconf.skip_lock_out_of_tbegin_retries;
+ }
+ }
+
+use_lock:
+ return LLL_LOCK ((*lock), pshared);
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-timed.c b/sysdeps/unix/sysv/linux/powerpc/elision-timed.c
new file mode 100644
index 0000000..7d5de9b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-timed.c
@@ -0,0 +1,28 @@
+/* elision-timed.c: Lock elision timed lock.
+ Copyright (C) 2014 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 <time.h>
+#include <elision-conf.h>
+#include "lowlevellock.h"
+
+#define __lll_lock_elision __lll_timedlock_elision
+#define EXTRAARG const struct timespec *t,
+#undef LLL_LOCK
+#define LLL_LOCK(a, b) lll_timedlock(a, t, b)
+
+#include "elision-lock.c"
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c b/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c
new file mode 100644
index 0000000..60aaf90
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-trylock.c
@@ -0,0 +1,68 @@
+/* elision-trylock.c: Lock eliding trylock for pthreads.
+ Copyright (C) 2014 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 <pthread.h>
+#include <pthreadP.h>
+#include <lowlevellock.h>
+#include <elision-conf.h>
+#include "htm.h"
+
+#define aconf __elision_aconf
+
+/* Try to elide a futex trylock. FUTEX is the futex variable. ADAPT_COUNT is
+ the adaptation counter in the mutex. */
+
+int
+__lll_trylock_elision (int *futex, short *adapt_count)
+{
+ /* Implement POSIX semantics by forbiding nesting elided trylocks. */
+ __builtin_tabort (_ABORT_NESTED_TRYLOCK);
+
+ /* Only try a transaction if it's worth it. */
+ if (*adapt_count > 0)
+ {
+ (*adapt_count)--;
+ goto use_lock;
+ }
+
+ if (__builtin_tbegin (0))
+ {
+ if (*futex == 0)
+ return 0;
+
+ /* Lock was busy. Fall back to normal locking. */
+ __builtin_tabort (_ABORT_LOCK_BUSY);
+ }
+ else
+ {
+ if (_TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ()))
+ {
+ /* A persistent failure indicates that a retry will probably
+ resulting in another failure. Use normal locking now and
+ for the next couple of calls. */
+ if (aconf.skip_trylock_internal_abort > 0)
+ *adapt_count = aconf.skip_trylock_internal_abort;
+ }
+
+ if (aconf.skip_lock_busy > 0)
+ *adapt_count = aconf.skip_lock_busy;
+ }
+
+use_lock:
+ return lll_trylock (*futex);
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c b/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
new file mode 100644
index 0000000..59d46bb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/elision-unlock.c
@@ -0,0 +1,32 @@
+/* elision-unlock.c: Commit an elided pthread lock.
+ Copyright (C) 2014 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 "pthreadP.h"
+#include "lowlevellock.h"
+#include "htm.h"
+
+int
+__lll_unlock_elision(int *lock, int pshared)
+{
+ /* When the lock was free we're in a transaction. */
+ if (*lock == 0)
+ __builtin_tend (0);
+ else
+ lll_unlock ((*lock), pshared);
+ return 0;
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/force-elision.h b/sysdeps/unix/sysv/linux/powerpc/force-elision.h
new file mode 100644
index 0000000..38c79bf
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/force-elision.h
@@ -0,0 +1,33 @@
+/* force-elision.h: Automatic enabling of elision for mutexes
+ Copyright (C) 2014 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/>. */
+
+#ifdef ENABLE_LOCK_ELISION
+/* Check for elision on this lock without upgrading. */
+#define DO_ELISION(m) \
+ (__pthread_force_elision \
+ && (m->__data.__kind & PTHREAD_MUTEX_NO_ELISION_NP) == 0) \
+
+/* Automatically enable elision for existing user lock kinds. */
+#define FORCE_ELISION(m, s) \
+ if (__pthread_force_elision \
+ && (m->__data.__kind & PTHREAD_MUTEX_ELISION_FLAGS_NP) == 0) \
+ { \
+ mutex->__data.__kind |= PTHREAD_MUTEX_ELISION_NP; \
+ s; \
+ }
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/htm.h b/sysdeps/unix/sysv/linux/powerpc/htm.h
new file mode 100644
index 0000000..b0a5ab0
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/htm.h
@@ -0,0 +1,142 @@
+/* Shared HTM header. Emulate transactional execution facility intrinsics for
+ compilers and assemblers that do not support the intrinsics and instructions
+ yet.
+
+ Copyright (C) 2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _HTM_H
+#define _HTM_H 1
+
+#ifdef __ASSEMBLER__
+
+/* tbegin. */
+.macro TBEGIN
+ .byte 0x7c,0x00,0x05,0x1d
+.endm
+
+/* tend. 0 */
+.macro TEND
+ .byte 0x7c,0x00,0x05,0x5d
+.endm
+
+/* tabort. code */
+.macro TABORT code
+ .byte 0x7c
+ .byte \code
+ .byte 0x07
+ .byte 0x1d
+.endm
+
+/* mfspr %dst,130 */
+.macro TEXASR dst
+ mfspr \dst,130
+.endm
+
+#else
+
+#include <endian.h>
+
+/* Official HTM intrinsics interface matching gcc, but works
+ on older gcc compatible compilers and binutils.
+ We should somehow detect if the compiler supports it, because
+ it may be able to generate slightly better code. */
+
+#define TBEGIN ".long 0x7c00051d"
+#define TEND ".long 0x7c00055d"
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# define TABORT ".byte 0x1d,0x07,%1,0x1d"
+#else
+# define TABORT ".byte 0x7c,%1,0x07,0x1d"
+#endif
+
+#define __force_inline inline __attribute__((__always_inline__))
+
+#ifndef __HTM__
+
+#define _TEXASRU_EXTRACT_BITS(TEXASR,BITNUM,SIZE) \
+ (((TEXASR) >> (31-(BITNUM))) & ((1<<(SIZE))-1))
+#define _TEXASRU_FAILURE_PERSISTENT(TEXASRU) \
+ _TEXASRU_EXTRACT_BITS(TEXASRU, 7, 1)
+
+static __force_inline
+unsigned int _tbegin (void)
+{
+ unsigned int ret;
+ asm volatile (
+ TBEGIN "\t\n"
+ "mfcr %0\t\n"
+ "rlwinm %0,%0,3,1\t\n"
+ "xori %0,%0,1\t\n"
+ : "=r" (ret) :: "cr0", "memory");
+ return ret;
+}
+
+static __force_inline
+unsigned int _tend (void)
+{
+ unsigned int ret;
+ asm volatile (
+ TEND "\t\n"
+ "mfcr %0\t\n"
+ "rlwinm %0,%0,3,1\t\n"
+ "xori %0,%0,1\t\n"
+ : "=r" (ret) :: "cr0", "memory");
+ return ret;
+}
+
+static __force_inline
+unsigned int _tabort (unsigned int code)
+{
+ unsigned int ret;
+ asm volatile (
+ TABORT "\t\n"
+ "mfcr %0\t\n"
+ "rlwinm %0,%0,3,1\t\n"
+ "xori %0,%0,1\t\n"
+ : "=r" (ret) : "r" (code) : "cr0", "memory");
+ return ret;
+}
+
+static __force_inline
+unsigned long _texasru (void)
+{
+ unsigned long ret;
+ asm volatile (
+ "mfspr %0,131\t\n"
+ : "=r" (ret));
+ return ret;
+}
+
+#define __builtin_tbegin(tdb) _tbegin ()
+#define __builtin_tend(nested) _tend ()
+#define __builtin_tabort(abortcode) _tabort (abortcode)
+#define __builtin_get_texasru() _texasru ()
+
+#else
+# include <htmintrin.h>
+#endif /* __HTM__ */
+
+#endif /* __ASSEMBLER__ */
+
+/* Definitions used for TEXASR Failure code (bits 0:6), they need to be even
+ because tabort. always sets the first bit. */
+#define _ABORT_LOCK_BUSY 0x3f /* Lock already used. */
+#define _ABORT_NESTED_TRYLOCK 0x3e /* Write operation in trylock. */
+#define _ABORT_SYSCALL 0x3d /* Syscall issued. */
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h b/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
new file mode 100644
index 0000000..36c8ade
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/lowlevellock.h
@@ -0,0 +1,48 @@
+/* PowerPC specific lock definitions.
+ Copyright (C) 2014 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#ifndef _POWERPC_LOWLEVELLOCK_H
+#define _POWERPC_LOWLEVELLOCK_H 1
+
+#include <sysdeps/nptl/lowlevellock.h>
+
+/* Transactional lock elision definitions. */
+extern int __lll_timedlock_elision
+ (int *futex, short *adapt_count, const struct timespec *timeout, int private)
+ attribute_hidden;
+
+#define lll_timedlock_elision(futex, adapt_count, timeout, private) \
+ __lll_timedlock_elision(&(futex), &(adapt_count), timeout, private)
+
+extern int __lll_lock_elision (int *futex, short *adapt_count, int private)
+ attribute_hidden;
+
+extern int __lll_unlock_elision(int *lock, int private)
+ attribute_hidden;
+
+extern int __lll_trylock_elision(int *lock, short *adapt_count)
+ attribute_hidden;
+
+#define lll_lock_elision(futex, adapt_count, private) \
+ __lll_lock_elision (&(futex), &(adapt_count), private)
+#define lll_unlock_elision(futex, private) \
+ __lll_unlock_elision (&(futex), private)
+#define lll_trylock_elision(futex, adapt_count) \
+ __lll_trylock_elision (&(futex), &(adapt_count))
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_cond_lock.c b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_cond_lock.c
new file mode 100644
index 0000000..aa6cf9a
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_cond_lock.c
@@ -0,0 +1,22 @@
+/* Copyright (C) 2014 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/>. */
+
+/* The cond lock is not actually elided yet, but we still need to handle
+ already elided locks. */
+#include <elision-conf.h>
+
+#include <nptl/pthread_mutex_cond_lock.c>
diff --git a/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_lock.c b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_lock.c
new file mode 100644
index 0000000..6fd6a98
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_lock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_lock.
+ Copyright (C) 2014 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 <elision-conf.h>
+#include <force-elision.h>
+
+#include <nptl/pthread_mutex_lock.c>
diff --git a/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_timedlock.c b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_timedlock.c
new file mode 100644
index 0000000..d0e6537
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_timedlock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_timedlock.
+ Copyright (C) 2014 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 <elision-conf.h>
+#include <force-elision.h>
+
+#include <nptl/pthread_mutex_timedlock.c>
diff --git a/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_trylock.c b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_trylock.c
new file mode 100644
index 0000000..ea8a8ff
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/powerpc/pthread_mutex_trylock.c
@@ -0,0 +1,22 @@
+/* Elided version of pthread_mutex_trylock.
+ Copyright (C) 2014 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 <elision-conf.h>
+#include <force-elision.h>
+
+#include <nptl/pthread_mutex_trylock.c>