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Fix semaphore destruction (bug 12674).

Browse Source 
This commit fixes semaphore destruction by either using 64b atomic
operations (where available), or by using two separate fields when only
32b atomic operations are available.  In the latter case, we keep a
conservative estimate of whether there are any waiting threads in one
bit of the field that counts the number of available tokens, thus
allowing sem_post to atomically both add a token and determine whether
it needs to call futex_wake.

See:
https://sourceware.org/ml/libc-alpha/2014-12/msg00155.html
This commit is contained in:
Carlos O'Donell 2015-01-21 00:46:16 -05:00
parent a8db092ec0
commit 042e1521c7
34 changed files with 731 additions and 2102 deletions
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52
ChangeLog
View File

@ -1,3 +1,55 @@
2015-01-21 Torvald Riegel <triegel@redhat.com>
Carlos O'Donell <carlos@redhat.com>
[BZ #12674]
* nptl/sem_waitcommon.c: New file.
* nptl/sem_wait.c: Include sem_waitcommon.c.
(__sem_wait_cleanup, do_futex_wait): Remove.
(__new_sem_wait): Adapt.
(__new_sem_trywait): New function.
(__old_sem_trywait): Moved here from nptl/sem_trywait.c.
* nptl/sem_timedwait.c: Include sem_waitcommon.c.
(__sem_wait_cleanup, do_futex_timed_wait): Remove.
(sem_timedwait): Adapt.
* nptl/sem_post.c (__new_sem_post): Adapt.
(futex_wake): New function.
(__old_sem_post): Add release MO fence.
* nptl/sem_open.c (sem_open): Adapt.
* nptl/sem_init.c (__new_sem_init): Adapt.
(futex_private_if_supported): New function.
* nptl/sem_getvalue.c (__new_sem_getvalue): Adapt.
(__old_sem_getvalue): Add using previous code.
* sysdeps/nptl/internaltypes.h: Adapt.
* nptl/tst-sem13.c (do_test): Adapt.
* nptl/tst-sem11.c (main): Adapt.
* nptl/sem_trywait.c: Remove.
* nptl/DESIGN-sem.txt: Remove.
* nptl/Makefile (libpthread-routines): Remove sem_trywait.
(gen-as-const-headers): Remove structsem.sym.
* nptl/structsem.sym: Remove.
* sysdeps/unix/sysv/linux/alpha/sem_post.c: Remove.
* sysdeps/unix/sysv/linux/i386/i486/sem_post.S: Remove.
* sysdeps/unix/sysv/linux/i386/i486/sem_timedwait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i486/sem_trywait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i486/sem_wait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i586/sem_post.S: Remove.
* sysdeps/unix/sysv/linux/i386/i586/sem_timedwait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i586/sem_trywait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i586/sem_wait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i686/sem_post.S: Remove.
* sysdeps/unix/sysv/linux/i386/i686/sem_timedwait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i686/sem_trywait.S: Remove.
* sysdeps/unix/sysv/linux/i386/i686/sem_wait.S: Remove.
* sysdeps/unix/sysv/linux/powerpc/sem_post.c: Remove.
* sysdeps/unix/sysv/linux/sh/sem_post.S: Remove.
* sysdeps/unix/sysv/linux/sh/sem_timedwait.S: Remove.
* sysdeps/unix/sysv/linux/sh/sem_trywait.S: Remove.
* sysdeps/unix/sysv/linux/sh/sem_wait.S: Remove.
* sysdeps/unix/sysv/linux/x86_64/sem_post.S: Remove.
* sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S: Remove.
* sysdeps/unix/sysv/linux/x86_64/sem_trywait.S: Remove.
* sysdeps/unix/sysv/linux/x86_64/sem_wait.S: Remove.
2015-01-20 Carlos O'Donell <carlos@redhat.com>
* INSTALL: Regenerated.

25
NEWS
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@ -9,15 +9,22 @@ Version 2.21
* The following bugs are resolved with this release:
6652, 10672, 12847, 12926, 13862, 14132, 14138, 14171, 14498, 15215,
15884, 16009, 16191, 16469, 16617, 16619, 16657, 16740, 16857, 17192,
17266, 17273, 17344, 17363, 17370, 17371, 17411, 17460, 17475, 17485,
17501, 17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573, 17574,
17582, 17583, 17584, 17585, 17589, 17594, 17601, 17608, 17616, 17625,
17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664, 17665,
17668, 17682, 17717, 17719, 17722, 17723, 17724, 17725, 17732, 17733,
17744, 17745, 17746, 17747, 17748, 17775, 17777, 17780, 17781, 17782,
17791, 17793, 17796, 17797, 17803, 17806, 17834, 17844, 17848
6652, 10672, 12674, 12847, 12926, 13862, 14132, 14138, 14171, 14498,
15215, 15884, 16009, 16191, 16469, 16617, 16619, 16657, 16740, 16857,
17192, 17266, 17273, 17344, 17363, 17370, 17371, 17411, 17460, 17475,
17485, 17501, 17506, 17508, 17522, 17555, 17570, 17571, 17572, 17573,
17574, 17582, 17583, 17584, 17585, 17589, 17594, 17601, 17608, 17616,
17625, 17630, 17633, 17634, 17635, 17647, 17653, 17657, 17658, 17664,
17665, 17668, 17682, 17717, 17719, 17722, 17723, 17724, 17725, 17732,
17733, 17744, 17745, 17746, 17747, 17748, 17775, 17777, 17780, 17781,
17782, 17791, 17793, 17796, 17797, 17803, 17806, 17834, 17844, 17848
* A new semaphore algorithm has been implemented in generic C code for all
machines. Previous custom assembly implementations of semaphore were
difficult to reason about or ensure that they were safe. The new version
of semaphore supports machines with 64-bit or 32-bit atomic operations.
The new semaphore algorithm is used by sem_init, sem_open, sem_post,
sem_wait, sem_timedwait, sem_trywait, and sem_getvalue.
* Port to Altera Nios II has been contributed by Mentor Graphics.

46
nptl/DESIGN-sem.txt
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@ -1,46 +0,0 @@
Semaphores pseudocode
==============================
int sem_wait(sem_t * sem);
int sem_trywait(sem_t * sem);
int sem_post(sem_t * sem);
int sem_getvalue(sem_t * sem, int * sval);
struct sem_t {
unsigned int count;
- current semaphore count, also used as a futex
}
sem_wait(sem_t *sem)
{
for (;;) {
if (atomic_decrement_if_positive(sem->count))
break;
futex_wait(&sem->count, 0)
}
}
sem_post(sem_t *sem)
{
n = atomic_increment(sem->count);
// Pass the new value of sem->count
futex_wake(&sem->count, n + 1);
}
sem_trywait(sem_t *sem)
{
if (atomic_decrement_if_positive(sem->count)) {
return 0;
} else {
return EAGAIN;
}
}
sem_getvalue(sem_t *sem, int *sval)
{
*sval = sem->count;
read_barrier();
}

5
nptl/Makefile
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@ -100,7 +100,7 @@ libpthread-routines = nptl-init vars events version \
sem_init sem_destroy \
sem_open sem_close sem_unlink \
sem_getvalue \
sem_wait sem_trywait sem_timedwait sem_post \
sem_wait sem_timedwait sem_post \
cleanup cleanup_defer cleanup_compat \
cleanup_defer_compat unwind \
pt-longjmp pt-cleanup\
@ -283,8 +283,7 @@ tests-nolibpthread = tst-unload
gen-as-const-headers = pthread-errnos.sym \
lowlevelcond.sym lowlevelrwlock.sym \
lowlevelbarrier.sym unwindbuf.sym \
lowlevelrobustlock.sym pthread-pi-defines.sym \
structsem.sym
lowlevelrobustlock.sym pthread-pi-defines.sym
LDFLAGS-pthread.so = -Wl,--enable-new-dtags,-z,nodelete,-z,initfirst

24
nptl/sem_getvalue.c
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@ -19,23 +19,37 @@
#include <semaphore.h>
#include <shlib-compat.h>
#include "semaphoreP.h"
#include <atomic.h>
int
__new_sem_getvalue (sem, sval)
sem_t *sem;
int *sval;
__new_sem_getvalue (sem_t *sem, int *sval)
{
struct new_sem *isem = (struct new_sem *) sem;
/* XXX Check for valid SEM parameter. */
/* FIXME This uses relaxed MO, even though POSIX specifies that this function
should be linearizable. However, its debatable whether linearizability
is the right requirement. We need to follow up with POSIX and, if
necessary, use a stronger MO here and elsewhere (e.g., potentially
release MO in all places where we consume a token). */
*sval = isem->value;
#if __HAVE_64B_ATOMICS
*sval = atomic_load_relaxed (&isem->data) & SEM_VALUE_MASK;
#else
*sval = atomic_load_relaxed (&isem->value) >> SEM_VALUE_SHIFT;
#endif
return 0;
}
versioned_symbol (libpthread, __new_sem_getvalue, sem_getvalue, GLIBC_2_1);
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
strong_alias (__new_sem_getvalue, __old_sem_getvalue)
int
__old_sem_getvalue (sem_t *sem, int *sval)
{
struct old_sem *isem = (struct old_sem *) sem;
*sval = isem->value;
return 0;
}
compat_symbol (libpthread, __old_sem_getvalue, sem_getvalue, GLIBC_2_0);
#endif

35
nptl/sem_init.c
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@ -18,17 +18,29 @@
#include <errno.h>
#include <semaphore.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include "semaphoreP.h"
#include <kernel-features.h>
/* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported;
returns FUTEX_SHARED otherwise.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline int
futex_private_if_supported (int pshared)
{
if (pshared != 0)
return LLL_SHARED;
#ifdef __ASSUME_PRIVATE_FUTEX
return LLL_PRIVATE;
#else
return THREAD_GETMEM (THREAD_SELF, header.private_futex)
^ FUTEX_PRIVATE_FLAG;
#endif
}
int
__new_sem_init (sem, pshared, value)
sem_t *sem;
int pshared;
unsigned int value;
__new_sem_init (sem_t *sem, int pshared, unsigned int value)
{
/* Parameter sanity check. */
if (__glibc_unlikely (value > SEM_VALUE_MAX))
@ -40,16 +52,15 @@ __new_sem_init (sem, pshared, value)
/* Map to the internal type. */
struct new_sem *isem = (struct new_sem *) sem;
/* Use the values the user provided. */
isem->value = value;
#ifdef __ASSUME_PRIVATE_FUTEX
isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
/* Use the values the caller provided. */
#if __HAVE_64B_ATOMICS
isem->data = value;
#else
isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
header.private_futex);
isem->value = value << SEM_VALUE_SHIFT;
isem->nwaiters = 0;
#endif
isem->nwaiters = 0;
isem->private = futex_private_if_supported (pshared);
return 0;
}

9
nptl/sem_open.c
View File

@ -193,9 +193,14 @@ sem_open (const char *name, int oflag, ...)
struct new_sem newsem;
} sem;
sem.newsem.value = value;
sem.newsem.private = 0;
#if __HAVE_64B_ATOMICS
sem.newsem.data = value;
#else
sem.newsem.value = value << SEM_VALUE_SHIFT;
sem.newsem.nwaiters = 0;
#endif
/* This always is a shared semaphore. */
sem.newsem.private = LLL_SHARED;
/* Initialize the remaining bytes as well. */
memset ((char *) &sem.initsem + sizeof (struct new_sem), '\0',

67
nptl/sem_post.c
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@ -26,34 +26,78 @@
#include <shlib-compat.h>
/* Wrapper for lll_futex_wake, with error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline void
futex_wake (unsigned int* futex, int processes_to_wake, int private)
{
int res = lll_futex_wake (futex, processes_to_wake, private);
/* No error. Ignore the number of woken processes. */
if (res >= 0)
return;
switch (res)
{
case -EFAULT: /* Could have happened due to memory reuse. */
case -EINVAL: /* Could be either due to incorrect alignment (a bug in
glibc or in the application) or due to memory being
reused for a PI futex. We cannot distinguish between the
two causes, and one of them is correct use, so we do not
act in this case. */
return;
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* See sem_wait for an explanation of the algorithm. */
int
__new_sem_post (sem_t *sem)
{
struct new_sem *isem = (struct new_sem *) sem;
int private = isem->private;
__typeof (isem->value) cur;
#if __HAVE_64B_ATOMICS
/* Add a token to the semaphore. We use release MO to make sure that a
thread acquiring this token synchronizes with us and other threads that
added tokens before (the release sequence includes atomic RMW operations
by other threads). */
/* TODO Use atomic_fetch_add to make it scale better than a CAS loop? */
unsigned long int d = atomic_load_relaxed (&isem->data);
do
{
cur = isem->value;
if (isem->value == SEM_VALUE_MAX)
if ((d & SEM_VALUE_MASK) == SEM_VALUE_MAX)
{
__set_errno (EOVERFLOW);
return -1;
}
}
while (atomic_compare_and_exchange_bool_rel (&isem->value, cur + 1, cur));
while (!atomic_compare_exchange_weak_release (&isem->data, &d, d + 1));
atomic_full_barrier ();
if (isem->nwaiters > 0)
/* If there is any potentially blocked waiter, wake one of them. */
if ((d >> SEM_NWAITERS_SHIFT) > 0)
futex_wake (((unsigned int *) &isem->data) + SEM_VALUE_OFFSET, 1, private);
#else
/* Add a token to the semaphore. Similar to 64b version. */
unsigned int v = atomic_load_relaxed (&isem->value);
do
{
int err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
if (__builtin_expect (err, 0) < 0)
if ((v << SEM_VALUE_SHIFT) == SEM_VALUE_MAX)
{
__set_errno (-err);
__set_errno (EOVERFLOW);
return -1;
}
}
while (!atomic_compare_exchange_weak_release (&isem->value,
&v, v + (1 << SEM_VALUE_SHIFT)));
/* If there is any potentially blocked waiter, wake one of them. */
if ((v & SEM_NWAITERS_MASK) != 0)
futex_wake (&isem->value, 1, private);
#endif
return 0;
}
versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
@ -66,6 +110,9 @@ __old_sem_post (sem_t *sem)
{
int *futex = (int *) sem;
/* We must need to synchronize with consumers of this token, so the atomic
increment must have release MO semantics. */
atomic_write_barrier ();
(void) atomic_increment_val (futex);
/* We always have to assume it is a shared semaphore. */
int err = lll_futex_wake (futex, 1, LLL_SHARED);

96
nptl/sem_timedwait.c
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@ -1,4 +1,4 @@
/* sem_timedwait -- wait on a semaphore. Generic futex-using version.
/* sem_timedwait -- wait on a semaphore with timeout.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
@ -17,101 +17,21 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <sys/time.h>
#include <pthreadP.h>
#include <shlib-compat.h>
extern void __sem_wait_cleanup (void *arg) attribute_hidden;
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_timed_wait (struct new_sem *isem, struct timespec *rt)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_timed_wait (&isem->value, 0, rt,
isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
#include "sem_waitcommon.c"
/* This is in a separate file because because sem_timedwait is only provided
if __USE_XOPEN2K is defined. */
int
sem_timedwait (sem_t *sem, const struct timespec *abstime)
{
struct new_sem *isem = (struct new_sem *) sem;
int err;
if (atomic_decrement_if_positive (&isem->value) > 0)
return 0;
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
{
__set_errno (EINVAL);
return -1;
}
atomic_increment (&isem->nwaiters);
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
if (sec < 0)
{
__set_errno (ETIMEDOUT);
err = -1;
break;
}
/* Do wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
err = do_futex_timed_wait(isem, &rt);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (atomic_decrement_if_positive (&isem->value) > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
atomic_decrement (&isem->nwaiters);
return err;
if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
return 0;
else
return __new_sem_wait_slow((struct new_sem *) sem, abstime);
}

50
nptl/sem_trywait.c
View File

@ -1,50 +0,0 @@
/* sem_trywait -- wait on a semaphore. Generic futex-using version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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 <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <atomic.h>
#include <shlib-compat.h>
int
__new_sem_trywait (sem_t *sem)
{
int *futex = (int *) sem;
int val;
if (*futex > 0)
{
val = atomic_decrement_if_positive (futex);
if (val > 0)
return 0;
}
__set_errno (EAGAIN);
return -1;
}
versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
strong_alias (__new_sem_trywait, __old_sem_trywait)
compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
#endif

101
nptl/sem_wait.c
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@ -17,80 +17,18 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <atomic.h>
void
attribute_hidden
__sem_wait_cleanup (void *arg)
{
struct new_sem *isem = (struct new_sem *) arg;
atomic_decrement (&isem->nwaiters);
}
/* This is in a seperate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. */
static int
__attribute__ ((noinline))
do_futex_wait (struct new_sem *isem)
{
int err, oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (&isem->value, 0, isem->private ^ FUTEX_PRIVATE_FLAG);
__pthread_disable_asynccancel (oldtype);
return err;
}
#include "sem_waitcommon.c"
int
__new_sem_wait (sem_t *sem)
{
struct new_sem *isem = (struct new_sem *) sem;
int err;
if (atomic_decrement_if_positive (&isem->value) > 0)
if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
return 0;
atomic_increment (&isem->nwaiters);
pthread_cleanup_push (__sem_wait_cleanup, isem);
while (1)
{
err = do_futex_wait(isem);
if (err != 0 && err != -EWOULDBLOCK)
{
__set_errno (-err);
err = -1;
break;
}
if (atomic_decrement_if_positive (&isem->value) > 0)
{
err = 0;
break;
}
}
pthread_cleanup_pop (0);
atomic_decrement (&isem->nwaiters);
return err;
else
return __new_sem_wait_slow((struct new_sem *) sem, NULL);
}
versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
@ -121,3 +59,34 @@ __old_sem_wait (sem_t *sem)
compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
#endif
int
__new_sem_trywait (sem_t *sem)
{
/* We must not fail spuriously, so require a definitive result even if this
may lead to a long execution time. */
if (__new_sem_wait_fast ((struct new_sem *) sem, 1) == 0)
return 0;
__set_errno (EAGAIN);
return -1;
}
versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
__old_sem_trywait (sem_t *sem)
{
int *futex = (int *) sem;
int val;
if (*futex > 0)
{
val = atomic_decrement_if_positive (futex);
if (val > 0)
return 0;
}
__set_errno (EAGAIN);
return -1;
}
compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
#endif

467
nptl/sem_waitcommon.c Normal file
View File

@ -0,0 +1,467 @@
/* sem_waitcommon -- wait on a semaphore, shared code.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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 <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <sys/time.h>
#include <pthreadP.h>
#include <shlib-compat.h>
#include <atomic.h>
/* Wrapper for lll_futex_wait with absolute timeout and error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline int
futex_abstimed_wait (unsigned int* futex, unsigned int expected,
const struct timespec* abstime, int private, bool cancel)
{
int err, oldtype;
if (abstime == NULL)
{
if (cancel)
oldtype = __pthread_enable_asynccancel ();
err = lll_futex_wait (futex, expected, private);
if (cancel)
__pthread_disable_asynccancel (oldtype);
}
else
{
struct timeval tv;
struct timespec rt;
int sec, nsec;
/* Get the current time. */
__gettimeofday (&tv, NULL);
/* Compute relative timeout. */
sec = abstime->tv_sec - tv.tv_sec;
nsec = abstime->tv_nsec - tv.tv_usec * 1000;
if (nsec < 0)
{
nsec += 1000000000;
--sec;
}
/* Already timed out? */
if (sec < 0)
return ETIMEDOUT;
/* Do wait. */
rt.tv_sec = sec;
rt.tv_nsec = nsec;
if (cancel)
oldtype = __pthread_enable_asynccancel ();
err = lll_futex_timed_wait (futex, expected, &rt, private);
if (cancel)
__pthread_disable_asynccancel (oldtype);
}
switch (err)
{
case 0:
case -EAGAIN:
case -EINTR:
case -ETIMEDOUT:
return -err;
case -EFAULT: /* Must have been caused by a glibc or application bug. */
case -EINVAL: /* Either due to wrong alignment or due to the timeout not
being normalized. Must have been caused by a glibc or
application bug. */
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* Wrapper for lll_futex_wake, with error checking.
TODO Remove when cleaning up the futex API throughout glibc. */
static __always_inline void
futex_wake (unsigned int* futex, int processes_to_wake, int private)
{
int res = lll_futex_wake (futex, processes_to_wake, private);
/* No error. Ignore the number of woken processes. */
if (res >= 0)
return;
switch (res)
{
case -EFAULT: /* Could have happened due to memory reuse. */
case -EINVAL: /* Could be either due to incorrect alignment (a bug in
glibc or in the application) or due to memory being
reused for a PI futex. We cannot distinguish between the
two causes, and one of them is correct use, so we do not
act in this case. */
return;
case -ENOSYS: /* Must have been caused by a glibc bug. */
/* No other errors are documented at this time. */
default:
abort ();
}
}
/* The semaphore provides two main operations: sem_post adds a token to the
semaphore; sem_wait grabs a token from the semaphore, potentially waiting
until there is a token available. A sem_wait needs to synchronize with
the sem_post that provided the token, so that whatever lead to the sem_post
happens before the code after sem_wait.
Conceptually, available tokens can simply be counted; let's call that the
value of the semaphore. However, we also want to know whether there might
be a sem_wait that is blocked on the value because it was zero (using a
futex with the value being the futex variable); if there is no blocked
sem_wait, sem_post does not need to execute a futex_wake call. Therefore,
we also need to count the number of potentially blocked sem_wait calls
(which we call nwaiters).
What makes this tricky is that POSIX requires that a semaphore can be
destroyed as soon as the last remaining sem_wait has returned, and no
other sem_wait or sem_post calls are executing concurrently. However, the
sem_post call whose token was consumed by the last sem_wait is considered
to have finished once it provided the token to the sem_wait.
Thus, sem_post must not access the semaphore struct anymore after it has
made a token available; IOW, it needs to be able to atomically provide
a token and check whether any blocked sem_wait calls might exist.
This is straightforward to do if the architecture provides 64b atomics
because we can just put both the value and nwaiters into one variable that
we access atomically: This is the data field, the value is in the
least-significant 32 bits, and nwaiters in the other bits. When sem_post
makes a value available, it can atomically check nwaiters.
If we have only 32b atomics available, we cannot put both nwaiters and
value into one 32b value because then we might have too few bits for both
of those counters. Therefore, we need to use two distinct fields.
To allow sem_post to atomically make a token available and check for
blocked sem_wait calls, we use one bit in value to indicate whether
nwaiters is nonzero. That allows sem_post to use basically the same
algorithm as with 64b atomics, but requires sem_wait to update the bit; it
can't do this atomically with another access to nwaiters, but it can compute
a conservative value for the bit because it's benign if the bit is set
even if nwaiters is zero (all we get is an unnecessary futex wake call by
sem_post).
Specifically, sem_wait will unset the bit speculatively if it believes that
there is no other concurrently executing sem_wait. If it misspeculated,
it will have to clean up by waking any other sem_wait call (i.e., what
sem_post would do otherwise). This does not conflict with the destruction
requirement because the semaphore must not be destructed while any sem_wait
is still executing. */
/* Set this to true if you assume that, in contrast to current Linux futex
documentation, lll_futex_wake can return -EINTR only if interrupted by a
signal, not spuriously due to some other reason.
TODO Discuss EINTR conditions with the Linux kernel community. For
now, we set this to true to not change behavior of semaphores compared
to previous glibc builds. */
static const int sem_assume_only_signals_cause_futex_EINTR = 1;
#if !__HAVE_64B_ATOMICS
static void
__sem_wait_32_finish (struct new_sem *sem);
#endif
static void
__sem_wait_cleanup (void *arg)
{
struct new_sem *sem = (struct new_sem *) arg;
#if __HAVE_64B_ATOMICS
/* Stop being registered as a waiter. See below for MO. */
atomic_fetch_add_relaxed (&sem->data, -(1UL << SEM_NWAITERS_SHIFT));
#else
__sem_wait_32_finish (sem);
#endif
}
/* Wait until at least one token is available, possibly with a timeout.
This is in a separate function in order to make sure gcc
puts the call site into an exception region, and thus the
cleanups get properly run. TODO still necessary? Other futex_wait
users don't seem to need it. */
static int
__attribute__ ((noinline))
do_futex_wait (struct new_sem *sem, const struct timespec *abstime)
{
int err;
#if __HAVE_64B_ATOMICS
err = futex_abstimed_wait ((unsigned int *) &sem->data + SEM_VALUE_OFFSET, 0,
abstime, sem->private, true);
#else
err = futex_abstimed_wait (&sem->value, SEM_NWAITERS_MASK, abstime,
sem->private, true);
#endif
return err;
}
/* Fast path: Try to grab a token without blocking. */
static int
__new_sem_wait_fast (struct new_sem *sem, int definitive_result)
{
/* We need acquire MO if we actually grab a token, so that this
synchronizes with all token providers (i.e., the RMW operation we read
from or all those before it in modification order; also see sem_post).
We do not need to guarantee any ordering if we observed that there is
no token (POSIX leaves it unspecified whether functions that fail
synchronize memory); thus, relaxed MO is sufficient for the initial load
and the failure path of the CAS. If the weak CAS fails and we need a
definitive result, retry. */
#if __HAVE_64B_ATOMICS
unsigned long d = atomic_load_relaxed (&sem->data);
do
{
if ((d & SEM_VALUE_MASK) == 0)
break;
if (atomic_compare_exchange_weak_acquire (&sem->data, &d, d - 1))
return 0;
}
while (definitive_result);
return -1;
#else
unsigned int v = atomic_load_relaxed (&sem->value);
do
{
if ((v >> SEM_VALUE_SHIFT) == 0)
break;
if (atomic_compare_exchange_weak_acquire (&sem->value,
&v, v - (1 << SEM_VALUE_SHIFT)))
return 0;
}
while (definitive_result);
return -1;
#endif
}
/* Slow path that blocks. */
static int
__attribute__ ((noinline))
__new_sem_wait_slow (struct new_sem *sem, const struct timespec *abstime)
{
int err = 0;
#if __HAVE_64B_ATOMICS
/* Add a waiter. Relaxed MO is sufficient because we can rely on the
ordering provided by the RMW operations we use. */
unsigned long d = atomic_fetch_add_relaxed (&sem->data,
1UL << SEM_NWAITERS_SHIFT);
pthread_cleanup_push (__sem_wait_cleanup, sem);
/* Wait for a token to be available. Retry until we can grab one. */
for (;;)
{
/* If there is no token available, sleep until there is. */
if ((d & SEM_VALUE_MASK) == 0)
{
err = do_futex_wait (sem, abstime);
/* A futex return value of 0 or EAGAIN is due to a real or spurious
wake-up, or due to a change in the number of tokens. We retry in
these cases.
If we timed out, forward this to the caller.
EINTR could be either due to being interrupted by a signal, or
due to a spurious wake-up. Thus, we cannot distinguish between
both, and are not allowed to return EINTR to the caller but have
to retry; this is because we may not have been interrupted by a
signal. However, if we assume that only signals cause a futex
return of EINTR, we forward EINTR to the caller.
Retrying on EINTR is technically always allowed because to
reliably interrupt sem_wait with a signal, the signal handler
must call sem_post (which is AS-Safe). In executions where the
signal handler does not do that, the implementation can correctly
claim that sem_wait hadn't actually started to execute yet, and
thus the signal never actually interrupted sem_wait. We make no
timing guarantees, so the program can never observe that sem_wait
actually did start to execute. Thus, in a correct program, we
can expect a signal that wanted to interrupt the sem_wait to have
provided a token, and can just try to grab this token if
futex_wait returns EINTR. */
if (err == ETIMEDOUT ||
(err == EINTR && sem_assume_only_signals_cause_futex_EINTR))
{
__set_errno (err);
err = -1;
/* Stop being registered as a waiter. */
atomic_fetch_add_relaxed (&sem->data,
-(1UL << SEM_NWAITERS_SHIFT));
break;
}
/* Relaxed MO is sufficient; see below. */
d = atomic_load_relaxed (&sem->data);
}
else
{
/* Try to grab both a token and stop being a waiter. We need
acquire MO so this synchronizes with all token providers (i.e.,
the RMW operation we read from or all those before it in
modification order; also see sem_post). On the failure path,
relaxed MO is sufficient because we only eventually need the
up-to-date value; the futex_wait or the CAS perform the real
work. */
if (atomic_compare_exchange_weak_acquire (&sem->data,
&d, d - 1 - (1UL << SEM_NWAITERS_SHIFT)))
{
err = 0;
break;
}
}
}
pthread_cleanup_pop (0);
#else
/* The main difference to the 64b-atomics implementation is that we need to
access value and nwaiters in separate steps, and that the nwaiters bit
in the value can temporarily not be set even if nwaiters is nonzero.
We work around incorrectly unsetting the nwaiters bit by letting sem_wait
set the bit again and waking the number of waiters that could grab a
token. There are two additional properties we need to ensure:
(1) We make sure that whenever unsetting the bit, we see the increment of
nwaiters by the other thread that set the bit. IOW, we will notice if
we make a mistake.
(2) When setting the nwaiters bit, we make sure that we see the unsetting
of the bit by another waiter that happened before us. This avoids having
to blindly set the bit whenever we need to block on it. We set/unset
the bit while having incremented nwaiters (i.e., are a registered
waiter), and the problematic case only happens when one waiter indeed
followed another (i.e., nwaiters was never larger than 1); thus, this
works similarly as with a critical section using nwaiters (see the MOs
and related comments below).
An alternative approach would be to unset the bit after decrementing
nwaiters; however, that would result in needing Dekker-like
synchronization and thus full memory barriers. We also would not be able
to prevent misspeculation, so this alternative scheme does not seem
beneficial. */
unsigned int v;
/* Add a waiter. We need acquire MO so this synchronizes with the release
MO we use when decrementing nwaiters below; it ensures that if another
waiter unset the bit before us, we see that and set it again. Also see
property (2) above. */
atomic_fetch_add_acquire (&sem->nwaiters, 1);
pthread_cleanup_push (__sem_wait_cleanup, sem);
/* Wait for a token to be available. Retry until we can grab one. */
/* We do not need any ordering wrt. to this load's reads-from, so relaxed
MO is sufficient. The acquire MO above ensures that in the problematic
case, we do see the unsetting of the bit by another waiter. */
v = atomic_load_relaxed (&sem->value);
do
{
do
{
/* We are about to block, so make sure that the nwaiters bit is
set. We need release MO on the CAS to ensure that when another
waiter unsets the nwaiters bit, it will also observe that we
incremented nwaiters in the meantime (also see the unsetting of
the bit below). Relaxed MO on CAS failure is sufficient (see
above). */
do
{
if ((v & SEM_NWAITERS_MASK) != 0)
break;
}
while (!atomic_compare_exchange_weak_release (&sem->value,
&v, v | SEM_NWAITERS_MASK));
/* If there is no token, wait. */
if ((v >> SEM_VALUE_SHIFT) == 0)
{
/* See __HAVE_64B_ATOMICS variant. */
err = do_futex_wait(sem, abstime);
if (err == ETIMEDOUT ||
(err == EINTR && sem_assume_only_signals_cause_futex_EINTR))
{
__set_errno (err);
err = -1;
goto error;
}
err = 0;
/* We blocked, so there might be a token now. Relaxed MO is
sufficient (see above). */
v = atomic_load_relaxed (&sem->value);
}
}
/* If there is no token, we must not try to grab one. */
while ((v >> SEM_VALUE_SHIFT) == 0);
}
/* Try to grab a token. We need acquire MO so this synchronizes with
all token providers (i.e., the RMW operation we read from or all those
before it in modification order; also see sem_post). */
while (!atomic_compare_exchange_weak_acquire (&sem->value,
&v, v - (1 << SEM_VALUE_SHIFT)));
error:
pthread_cleanup_pop (0);
__sem_wait_32_finish (sem);
#endif
return err;
}
/* Stop being a registered waiter (non-64b-atomics code only). */
#if !__HAVE_64B_ATOMICS
static void
__sem_wait_32_finish (struct new_sem *sem)
{
/* The nwaiters bit is still set, try to unset it now if this seems
necessary. We do this before decrementing nwaiters so that the unsetting
is visible to other waiters entering after us. Relaxed MO is sufficient
because we are just speculating here; a stronger MO would not prevent
misspeculation. */
unsigned int wguess = atomic_load_relaxed (&sem->nwaiters);
if (wguess == 1)
/* We might be the last waiter, so unset. This needs acquire MO so that
it syncronizes with the release MO when setting the bit above; if we
overwrite someone else that set the bit, we'll read in the following
decrement of nwaiters at least from that release sequence, so we'll
see if the other waiter is still active or if another writer entered
in the meantime (i.e., using the check below). */
atomic_fetch_and_acquire (&sem->value, ~SEM_NWAITERS_MASK);
/* Now stop being a waiter, and see whether our guess was correct.
This needs release MO so that it synchronizes with the acquire MO when
a waiter increments nwaiters; this makes sure that newer writers see that
we reset the waiters_present bit. */
unsigned int wfinal = atomic_fetch_add_release (&sem->nwaiters, -1);
if (wfinal > 1 && wguess == 1)
{
/* We guessed wrong, and so need to clean up after the mistake and
unblock any waiters that could have not been woken. There is no
additional ordering that we need to set up, so relaxed MO is
sufficient. */
unsigned int v = atomic_fetch_or_relaxed (&sem->value,
SEM_NWAITERS_MASK);
/* If there are available tokens, then wake as many waiters. If there
aren't any, then there is no need to wake anyone because there is
none to grab for another waiter. If tokens become available
subsequently, then the respective sem_post calls will do the wake-up
due to us having set the nwaiters bit again. */
v >>= SEM_VALUE_SHIFT;
if (v > 0)
futex_wake (&sem->value, v, sem->private);
}
}
#endif

12
nptl/structsem.sym
View File

@ -1,12 +0,0 @@
#include <limits.h>
#include <stddef.h>
#include <sched.h>
#include <bits/pthreadtypes.h>
#include "internaltypes.h"
--
VALUE offsetof (struct new_sem, value)
PRIVATE offsetof (struct new_sem, private)
NWAITERS offsetof (struct new_sem, nwaiters)
SEM_VALUE_MAX SEM_VALUE_MAX

9
nptl/tst-sem11.c
View File

@ -34,8 +34,11 @@ main (void)
puts ("sem_init failed");
return 1;
}
#if __HAVE_64B_ATOMICS
if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
#else
if (u.ns.nwaiters != 0)
#endif
{
puts ("nwaiters not initialized");
return 1;
@ -68,7 +71,11 @@ main (void)
goto again;
}
#if __HAVE_64B_ATOMICS
if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
#else
if (u.ns.nwaiters != 0)
#endif
{
puts ("nwaiters not reset");
return 1;

18
nptl/tst-sem13.c
View File

@ -33,9 +33,14 @@ do_test (void)
perror ("sem_timedwait did not fail with EINVAL");
return 1;
}
if (u.ns.nwaiters != 0)
#if __HAVE_64B_ATOMICS
unsigned int nwaiters = (u.ns.data >> SEM_NWAITERS_SHIFT);
#else
unsigned int nwaiters = u.ns.nwaiters;
#endif
if (nwaiters != 0)
{
printf ("sem_timedwait modified nwaiters: %ld\n", u.ns.nwaiters);
printf ("sem_timedwait modified nwaiters: %d\n", nwaiters);
return 1;
}
@ -52,9 +57,14 @@ do_test (void)
perror ("2nd sem_timedwait did not fail with ETIMEDOUT");
return 1;
}
if (u.ns.nwaiters != 0)
#if __HAVE_64B_ATOMICS
nwaiters = (u.ns.data >> SEM_NWAITERS_SHIFT);
#else
nwaiters = u.ns.nwaiters;
#endif
if (nwaiters != 0)
{
printf ("2nd sem_timedwait modified nwaiters: %ld\n", u.ns.nwaiters);
printf ("2nd sem_timedwait modified nwaiters: %d\n", nwaiters);
return 1;
}

24
sysdeps/nptl/internaltypes.h
View File

@ -20,6 +20,8 @@
#define _INTERNALTYPES_H 1
#include <stdint.h>
#include <atomic.h>
#include <endian.h>
struct pthread_attr
@ -141,9 +143,29 @@ struct pthread_key_struct
/* Semaphore variable structure. */
struct new_sem
{
#if __HAVE_64B_ATOMICS
/* The data field holds both value (in the least-significant 32 bytes) and
nwaiters. */
# if __BYTE_ORDER == __LITTLE_ENDIAN
# define SEM_VALUE_OFFSET 0
# elif __BYTE_ORDER == __BIG_ENDIAN
# define SEM_VALUE_OFFSET 1
# else
# error Unsupported byte order.
# endif
# define SEM_NWAITERS_SHIFT 32
# define SEM_VALUE_MASK (~(unsigned int)0)
unsigned long int data;
int private;
int pad;
#else
# define SEM_VALUE_SHIFT 1
# define SEM_NWAITERS_MASK ((unsigned int)1)
unsigned int value;
int private;
unsigned long int nwaiters;
int pad;
unsigned int nwaiters;
#endif
};
struct old_sem

5
sysdeps/unix/sysv/linux/alpha/sem_post.c
View File

@ -1,5 +0,0 @@
/* ??? This is an ass-backwards way to do this. We should simply define
the acquire/release semantics of atomic_exchange_and_add. And even if
we don't do this, we should be using atomic_full_barrier or otherwise. */
#define __lll_rel_instr "mb"
#include <nptl/sem_post.c>

150
sysdeps/unix/sysv/linux/i386/i486/sem_post.S
View File

@ -1,150 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
#include <lowlevellock.h>
.text
.globl __new_sem_post
.type __new_sem_post,@function
.align 16
__new_sem_post:
cfi_startproc
pushl %ebx
cfi_adjust_cfa_offset(4)
cfi_offset(%ebx, -8)
movl 8(%esp), %ebx
#if VALUE == 0
movl (%ebx), %eax
#else
movl VALUE(%ebx), %eax
#endif
0: cmpl $SEM_VALUE_MAX, %eax
je 3f
leal 1(%eax), %edx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%ebx)
#else
cmpxchgl %edx, VALUE(%ebx)
#endif
jnz 0b
cmpl $0, NWAITERS(%ebx)
je 2f
movl $FUTEX_WAKE, %ecx
orl PRIVATE(%ebx), %ecx
movl $1, %edx
movl $SYS_futex, %eax
ENTER_KERNEL
testl %eax, %eax
js 1f
2: xorl %eax, %eax
popl %ebx
cfi_adjust_cfa_offset(-4)
cfi_restore(%ebx)
ret
cfi_adjust_cfa_offset(4)
cfi_offset(%ebx, -8)
1:
#ifdef PIC
SETUP_PIC_REG(bx)
#else
movl $4f, %ebx
4:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ebx), %edx
addl %gs:0, %edx
movl $EINVAL, (%edx)
#else
movl errno@gotntpoff(%ebx), %edx
movl $EINVAL, %gs:(%edx)
#endif
orl $-1, %eax
popl %ebx
ret
3:
#ifdef PIC
SETUP_PIC_REG(bx)
#else
movl $5f, %ebx
5:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ebx), %edx
addl %gs:0, %edx
movl $EOVERFLOW, (%edx)
#else
movl errno@gotntpoff(%ebx), %edx
movl $EOVERFLOW, %gs:(%edx)
#endif
orl $-1, %eax
popl %ebx
cfi_adjust_cfa_offset(-4)
cfi_restore(%ebx)
ret
cfi_endproc
.size __new_sem_post,.-__new_sem_post
versioned_symbol(libpthread, __new_sem_post, sem_post, GLIBC_2_1)
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
.global __old_sem_post
.type __old_sem_post,@function
__old_sem_post:
cfi_startproc
pushl %ebx
cfi_adjust_cfa_offset(4)
cfi_offset(%ebx, -8)
movl 8(%esp), %ebx
LOCK
addl $1, (%ebx)
movl $SYS_futex, %eax
movl $FUTEX_WAKE, %ecx
movl $1, %edx
ENTER_KERNEL
testl %eax, %eax
js 1b
xorl %eax, %eax
popl %ebx
cfi_adjust_cfa_offset(-4)
cfi_restore(%ebx)
ret
cfi_endproc
.size __old_sem_post,.-__old_sem_post
compat_symbol(libpthread, __old_sem_post, sem_post, GLIBC_2_0)
#endif

327
sysdeps/unix/sysv/linux/i386/i486/sem_timedwait.S
View File

@ -1,327 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
#include <lowlevellock.h>
#if VALUE != 0
# error "code needs to be rewritten for VALUE != 0"
#endif
.text
.globl sem_timedwait
.type sem_timedwait,@function
.align 16
sem_timedwait:
.LSTARTCODE:
movl 4(%esp), %ecx
movl (%ecx), %eax
2: testl %eax, %eax
je 1f
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ecx)
jne 2b
xorl %eax, %eax
ret
/* Check whether the timeout value is valid. */
1: pushl %esi
.Lpush_esi:
pushl %edi
.Lpush_edi:
pushl %ebx
.Lpush_ebx:
subl $12, %esp
.Lsub_esp:
movl 32(%esp), %edi
/* Check for invalid nanosecond field. */
cmpl $1000000000, 4(%edi)
movl $EINVAL, %esi
jae .Lerrno_exit
LOCK
incl NWAITERS(%ecx)
7: xorl %ecx, %ecx
movl %esp, %ebx
movl %ecx, %edx
movl $__NR_gettimeofday, %eax
ENTER_KERNEL
/* Compute relative timeout. */
movl 4(%esp), %eax
movl $1000, %edx
mul %edx /* Milli seconds to nano seconds. */
movl (%edi), %ecx
movl 4(%edi), %edx
subl (%esp), %ecx
subl %eax, %edx
jns 5f
addl $1000000000, %edx
subl $1, %ecx
5: testl %ecx, %ecx
movl $ETIMEDOUT, %esi
js 6f /* Time is already up. */
movl %ecx, (%esp) /* Store relative timeout. */
movl %edx, 4(%esp)
.LcleanupSTART:
call __pthread_enable_asynccancel
movl %eax, 8(%esp)
movl 28(%esp), %ebx /* Load semaphore address. */
#if FUTEX_WAIT == 0
movl PRIVATE(%ebx), %ecx
#else
movl $FUTEX_WAIT, %ecx
orl PRIVATE(%ebx), %ecx
#endif
movl %esp, %esi
xorl %edx, %edx
movl $SYS_futex, %eax
ENTER_KERNEL
movl %eax, %esi
movl 8(%esp), %eax
call __pthread_disable_asynccancel
.LcleanupEND:
testl %esi, %esi
je 9f
cmpl $-EWOULDBLOCK, %esi
jne 3f
9: movl (%ebx), %eax
8: testl %eax, %eax
je 7b
leal -1(%eax), %ecx
LOCK
cmpxchgl %ecx, (%ebx)
jne 8b
xorl %eax, %eax
LOCK
decl NWAITERS(%ebx)
10: addl $12, %esp
.Ladd_esp:
popl %ebx
.Lpop_ebx:
popl %edi
.Lpop_edi:
popl %esi
.Lpop_esi:
ret
.Lafter_ret:
3: negl %esi
6:
movl 28(%esp), %ebx /* Load semaphore address. */
LOCK
decl NWAITERS(%ebx)
.Lerrno_exit:
#ifdef PIC
SETUP_PIC_REG(bx)
#else
movl $4f, %ebx
4:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ebx), %edx
addl %gs:0, %edx
movl %esi, (%edx)
#else
movl errno@gotntpoff(%ebx), %edx
movl %esi, %gs:(%edx)
#endif
orl $-1, %eax
jmp 10b
.size sem_timedwait,.-sem_timedwait
.type sem_wait_cleanup,@function
sem_wait_cleanup:
LOCK
decl NWAITERS(%ebx)
movl %eax, (%esp)
.LcallUR:
call _Unwind_Resume@PLT
hlt
.LENDCODE:
.size sem_wait_cleanup,.-sem_wait_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte 0xff # @LPStart format (omit)
.byte 0xff # @TType format (omit)
.byte 0x01 # call-site format
# DW_EH_PE_uleb128
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.uleb128 .LcleanupSTART-.LSTARTCODE
.uleb128 .LcleanupEND-.LcleanupSTART
.uleb128 sem_wait_cleanup-.LSTARTCODE
.uleb128 0
.uleb128 .LcallUR-.LSTARTCODE
.uleb128 .LENDCODE-.LcallUR
.uleb128 0
.uleb128 0
.Lcstend:
.section .eh_frame,"a",@progbits
.LSTARTFRAME:
.long .LENDCIE-.LSTARTCIE # Length of the CIE.
.LSTARTCIE:
.long 0 # CIE ID.
.byte 1 # Version number.
#ifdef SHARED
.string "zPLR" # NUL-terminated augmentation
# string.
#else
.string "zPL" # NUL-terminated augmentation
# string.
#endif
.uleb128 1 # Code alignment factor.
.sleb128 -4 # Data alignment factor.
.byte 8 # Return address register
# column.
#ifdef SHARED
.uleb128 7 # Augmentation value length.
.byte 0x9b # Personality: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4
# + DW_EH_PE_indirect
.long DW.ref.__gcc_personality_v0-.
.byte 0x1b # LSDA Encoding: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4.
.byte 0x1b # FDE Encoding: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4.
#else
.uleb128 6 # Augmentation value length.
.byte 0x0 # Personality: absolute
.long __gcc_personality_v0
.byte 0x0 # LSDA Encoding: absolute
#endif
.byte 0x0c # DW_CFA_def_cfa
.uleb128 4
.uleb128 4
.byte 0x88 # DW_CFA_offset, column 0x10
.uleb128 1
.align 4
.LENDCIE:
.long .LENDFDE-.LSTARTFDE # Length of the FDE.
.LSTARTFDE:
.long .LSTARTFDE-.LSTARTFRAME # CIE pointer.
#ifdef SHARED
.long .LSTARTCODE-. # PC-relative start address
# of the code.
#else
.long .LSTARTCODE # Start address of the code.
#endif
.long .LENDCODE-.LSTARTCODE # Length of the code.
.uleb128 4 # Augmentation size
#ifdef SHARED
.long .LexceptSTART-.
#else
.long .LexceptSTART
#endif
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_esi-.LSTARTCODE
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0x86 # DW_CFA_offset %esi
.uleb128 2
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_edi-.Lpush_esi
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 12
.byte 0x87 # DW_CFA_offset %edi
.uleb128 3
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_ebx-.Lpush_edi
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 4
.byte 4 # DW_CFA_advance_loc4
.long .Lsub_esp-.Lpush_ebx
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 28
.byte 4 # DW_CFA_advance_loc4
.long .Ladd_esp-.Lsub_esp
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 4 # DW_CFA_advance_loc4
.long .Lpop_ebx-.Ladd_esp
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 12
.byte 0xc3 # DW_CFA_restore %ebx
.byte 4 # DW_CFA_advance_loc4
.long .Lpop_edi-.Lpop_ebx
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0xc7 # DW_CFA_restore %edi
.byte 4 # DW_CFA_advance_loc4
.long .Lpop_esi-.Lpop_edi
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 4
.byte 0xc6 # DW_CFA_restore %esi
.byte 4 # DW_CFA_advance_loc4
.long .Lafter_ret-.Lpop_esi
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 28
.byte 0x86 # DW_CFA_offset %esi
.uleb128 2
.byte 0x87 # DW_CFA_offset %edi
.uleb128 3
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 4
.align 4
.LENDFDE:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align 4
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
.long __gcc_personality_v0
#endif

67
sysdeps/unix/sysv/linux/i386/i486/sem_trywait.S
View File

@ -1,67 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <lowlevellock.h>
.text
.globl __new_sem_trywait
.type __new_sem_trywait,@function
.align 16
__new_sem_trywait:
movl 4(%esp), %ecx
movl (%ecx), %eax
2: testl %eax, %eax
jz 1f
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ecx)
jne 2b
xorl %eax, %eax
ret
1:
#ifdef PIC
SETUP_PIC_REG(cx)
#else
movl $3f, %ecx
3:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ecx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ecx), %edx
addl %gs:0, %edx
movl $EAGAIN, (%edx)
#else
movl errno@gotntpoff(%ecx), %edx
movl $EAGAIN, %gs:(%edx)
#endif
orl $-1, %eax
ret
.size __new_sem_trywait,.-__new_sem_trywait
versioned_symbol(libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1)
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
.global __old_sem_trywait
__old_sem_trywait = __new_sem_trywait
compat_symbol(libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0)
#endif

343
sysdeps/unix/sysv/linux/i386/i486/sem_wait.S
View File

@ -1,343 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
#include <lowlevellock.h>
#if VALUE != 0
# error "code needs to be rewritten for VALUE != 0"
#endif
.text
.globl __new_sem_wait
.type __new_sem_wait,@function
.align 16
__new_sem_wait:
.LSTARTCODE:
pushl %ebx
.Lpush_ebx:
pushl %esi
.Lpush_esi:
subl $4, %esp
.Lsub_esp:
movl 16(%esp), %ebx
movl (%ebx), %eax
2: testl %eax, %eax
je 1f
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ebx)
jne 2b
7: xorl %eax, %eax
9: movl 4(%esp), %esi
movl 8(%esp), %ebx
addl $12, %esp
.Ladd_esp:
ret
.Lafter_ret:
1: LOCK
incl NWAITERS(%ebx)
.LcleanupSTART:
6: call __pthread_enable_asynccancel
movl %eax, (%esp)
#if FUTEX_WAIT == 0
movl PRIVATE(%ebx), %ecx
#else
movl $FUTEX_WAIT, %ecx
orl PRIVATE(%ebx), %ecx
#endif
xorl %esi, %esi
xorl %edx, %edx
movl $SYS_futex, %eax
ENTER_KERNEL
movl %eax, %esi
movl (%esp), %eax
call __pthread_disable_asynccancel
.LcleanupEND:
testl %esi, %esi
je 3f
cmpl $-EWOULDBLOCK, %esi
jne 4f
3:
movl (%ebx), %eax
5: testl %eax, %eax
je 6b
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ebx)
jne 5b
LOCK
decl NWAITERS(%ebx)
jmp 7b
4: LOCK
decl NWAITERS(%ebx)
negl %esi
#ifdef PIC
SETUP_PIC_REG(bx)
#else
movl $8f, %ebx
8:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ebx), %edx
addl %gs:0, %edx
movl %esi, (%edx)
#else
movl errno@gotntpoff(%ebx), %edx
movl %esi, %gs:(%edx)
#endif
orl $-1, %eax
jmp 9b
.size __new_sem_wait,.-__new_sem_wait
versioned_symbol(libpthread, __new_sem_wait, sem_wait, GLIBC_2_1)
.type sem_wait_cleanup,@function
sem_wait_cleanup:
LOCK
decl NWAITERS(%ebx)
movl %eax, (%esp)
.LcallUR:
call _Unwind_Resume@PLT
hlt
.LENDCODE:
.size sem_wait_cleanup,.-sem_wait_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte 0xff # @LPStart format (omit)
.byte 0xff # @TType format (omit)
.byte 0x01 # call-site format
# DW_EH_PE_uleb128
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.uleb128 .LcleanupSTART-.LSTARTCODE
.uleb128 .LcleanupEND-.LcleanupSTART
.uleb128 sem_wait_cleanup-.LSTARTCODE
.uleb128 0
.uleb128 .LcallUR-.LSTARTCODE
.uleb128 .LENDCODE-.LcallUR
.uleb128 0
.uleb128 0
.Lcstend:
.section .eh_frame,"a",@progbits
.LSTARTFRAME:
.long .LENDCIE-.LSTARTCIE # Length of the CIE.
.LSTARTCIE:
.long 0 # CIE ID.
.byte 1 # Version number.
#ifdef SHARED
.string "zPLR" # NUL-terminated augmentation
# string.
#else
.string "zPL" # NUL-terminated augmentation
# string.
#endif
.uleb128 1 # Code alignment factor.
.sleb128 -4 # Data alignment factor.
.byte 8 # Return address register
# column.
#ifdef SHARED
.uleb128 7 # Augmentation value length.
.byte 0x9b # Personality: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4
# + DW_EH_PE_indirect
.long DW.ref.__gcc_personality_v0-.
.byte 0x1b # LSDA Encoding: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4.
.byte 0x1b # FDE Encoding: DW_EH_PE_pcrel
# + DW_EH_PE_sdata4.
#else
.uleb128 6 # Augmentation value length.
.byte 0x0 # Personality: absolute
.long __gcc_personality_v0
.byte 0x0 # LSDA Encoding: absolute
#endif
.byte 0x0c # DW_CFA_def_cfa
.uleb128 4
.uleb128 4
.byte 0x88 # DW_CFA_offset, column 0x10
.uleb128 1
.align 4
.LENDCIE:
.long .LENDFDE-.LSTARTFDE # Length of the FDE.
.LSTARTFDE:
.long .LSTARTFDE-.LSTARTFRAME # CIE pointer.
#ifdef SHARED
.long .LSTARTCODE-. # PC-relative start address
# of the code.
#else
.long .LSTARTCODE # Start address of the code.
#endif
.long .LENDCODE-.LSTARTCODE # Length of the code.
.uleb128 4 # Augmentation size
#ifdef SHARED
.long .LexceptSTART-.
#else
.long .LexceptSTART
#endif
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_ebx-.LSTARTCODE
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 2
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_esi-.Lpush_ebx
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 12
.byte 0x86 # DW_CFA_offset %esi
.uleb128 3
.byte 4 # DW_CFA_advance_loc4
.long .Lsub_esp-.Lpush_esi
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 4 # DW_CFA_advance_loc4
.long .Ladd_esp-.Lsub_esp
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 4
.byte 0xc3 # DW_CFA_restore %ebx
.byte 0xc6 # DW_CFA_restore %esi
.byte 4 # DW_CFA_advance_loc4
.long .Lafter_ret-.Ladd_esp
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x83 # DW_CFA_offset %ebx
.uleb128 2
.byte 0x86 # DW_CFA_offset %esi
.uleb128 3
.align 4
.LENDFDE:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align 4
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
.long __gcc_personality_v0
#endif
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
.section ".text.compat", "ax"
.global __old_sem_wait
.type __old_sem_wait,@function
.align 16
cfi_startproc
__old_sem_wait:
pushl %ebx
cfi_adjust_cfa_offset(4)
pushl %esi
cfi_adjust_cfa_offset(4)
subl $4, %esp
cfi_adjust_cfa_offset(4)
movl 16(%esp), %ebx
cfi_offset(ebx, -8)
cfi_offset(esi, -12)
3: movl (%ebx), %eax
2: testl %eax, %eax
je 1f
leal -1(%eax), %edx
LOCK
cmpxchgl %edx, (%ebx)
jne 2b
xorl %eax, %eax
5: movl 4(%esp), %esi
movl 8(%esp), %ebx
addl $12, %esp
cfi_restore(ebx)
cfi_restore(esi)
cfi_adjust_cfa_offset(-12)
ret
cfi_adjust_cfa_offset(12)
cfi_offset(ebx, -8)
cfi_offset(esi, -12)
1: call __pthread_enable_asynccancel
movl %eax, (%esp)
xorl %esi, %esi
movl $SYS_futex, %eax
movl %esi, %ecx
movl %esi, %edx
ENTER_KERNEL
movl %eax, %esi
movl (%esp), %eax
call __pthread_disable_asynccancel
testl %esi, %esi
je 3b
cmpl $-EWOULDBLOCK, %esi
je 3b
negl %esi
#ifdef PIC
SETUP_PIC_REG(bx)
#else
movl $4f, %ebx
4:
#endif
addl $_GLOBAL_OFFSET_TABLE_, %ebx
#ifdef NO_TLS_DIRECT_SEG_REFS
movl errno@gotntpoff(%ebx), %edx
addl %gs:0, %edx
movl %esi, (%edx)
#else
movl errno@gotntpoff(%ebx), %edx
movl %esi, %gs:(%edx)
#endif
orl $-1, %eax
jmp 5b
cfi_endproc
.size __old_sem_wait,.-__old_sem_wait
compat_symbol(libpthread, __old_sem_wait, sem_wait, GLIBC_2_0)
#endif

19
sysdeps/unix/sysv/linux/i386/i586/sem_post.S
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@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_post.S"

19
sysdeps/unix/sysv/linux/i386/i586/sem_timedwait.S
View File

@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_timedwait.S"

19
sysdeps/unix/sysv/linux/i386/i586/sem_trywait.S
View File

@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_trywait.S"

19
sysdeps/unix/sysv/linux/i386/i586/sem_wait.S
View File

@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_wait.S"

19
sysdeps/unix/sysv/linux/i386/i686/sem_post.S
View File

@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_post.S"

19
sysdeps/unix/sysv/linux/i386/i686/sem_timedwait.S
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@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_timedwait.S"

19
sysdeps/unix/sysv/linux/i386/i686/sem_trywait.S
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@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_trywait.S"

19
sysdeps/unix/sysv/linux/i386/i686/sem_wait.S
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@ -1,19 +0,0 @@
/* Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
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 "../i486/sem_wait.S"

71
sysdeps/unix/sysv/linux/powerpc/sem_post.c
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@ -1,71 +0,0 @@
/* sem_post -- post to a POSIX semaphore. Powerpc version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
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 <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <internaltypes.h>
#include <semaphore.h>
#include <shlib-compat.h>
int
__new_sem_post (sem_t *sem)
{
struct new_sem *isem = (struct new_sem *) sem;
__asm __volatile (__ARCH_REL_INSTR ::: "memory");
atomic_increment (&isem->value);
__asm __volatile (__ARCH_ACQ_INSTR ::: "memory");
if (isem->nwaiters > 0)
{
int err = lll_futex_wake (&isem->value, 1,
isem->private ^ FUTEX_PRIVATE_FLAG);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
}
return 0;
}
versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
__old_sem_post (sem_t *sem)
{
int *futex = (int *) sem;
__asm __volatile (__ARCH_REL_INSTR ::: "memory");
(void) atomic_increment_val (futex);
/* We always have to assume it is a shared semaphore. */
int err = lll_futex_wake (futex, 1, LLL_SHARED);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
return -1;
}
return 0;
}
compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0);
#endif

75
sysdeps/unix/sysv/linux/x86_64/sem_post.S
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@ -1,75 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
.text
.globl sem_post
.type sem_post,@function
.align 16
sem_post:
#if VALUE == 0
movl (%rdi), %eax
#else
movl VALUE(%rdi), %eax
#endif
0: cmpl $SEM_VALUE_MAX, %eax
je 3f
leal 1(%rax), %esi
LOCK
#if VALUE == 0
cmpxchgl %esi, (%rdi)
#else
cmpxchgl %esi, VALUE(%rdi)
#endif
jnz 0b
LP_OP(cmp) $0, NWAITERS(%rdi)
je 2f
movl $SYS_futex, %eax
movl $FUTEX_WAKE, %esi
orl PRIVATE(%rdi), %esi
movl $1, %edx
syscall
testq %rax, %rax
js 1f
2: xorl %eax, %eax
retq
1:
movl $EINVAL, %eax
jmp 4f
3:
movl $EOVERFLOW, %eax
4:
movq errno@gottpoff(%rip), %rdx
movl %eax, %fs:(%rdx)
orl $-1, %eax
retq
.size sem_post,.-sem_post

380
sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S
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@ -1,380 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <kernel-features.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
.text
.globl sem_timedwait
.type sem_timedwait,@function
.align 16
sem_timedwait:
.LSTARTCODE:
cfi_startproc
#ifdef SHARED
cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect,
DW.ref.__gcc_personality_v0)
cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART)
#else
cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0)
cfi_lsda(DW_EH_PE_udata4, .LexceptSTART)
#endif
#if VALUE == 0
movl (%rdi), %eax
#else
movl VALUE(%rdi), %eax
#endif
2: testl %eax, %eax
je 1f
leaq -1(%rax), %rdx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%rdi)
#else
cmpxchgl %edx, VALUE(%rdi)
#endif
jne 2b
xorl %eax, %eax
retq
/* Check whether the timeout value is valid. */
1: cmpq $1000000000, 8(%rsi)
jae 6f
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
# ifdef PIC
cmpl $0, __have_futex_clock_realtime(%rip)
# else
cmpl $0, __have_futex_clock_realtime
# endif
je .Lreltmo
#endif
cmpq $0, (%rsi)
js 16f
/* This push is only needed to store the sem_t pointer for the
exception handler. */
pushq %rdi
cfi_adjust_cfa_offset(8)
movq %rsi, %r10
LOCK
LP_OP(add) $1, NWAITERS(%rdi)
.LcleanupSTART:
13: call __pthread_enable_asynccancel
movl %eax, %r8d
#if VALUE != 0
leaq VALUE(%rdi), %rdi
#endif
movl $0xffffffff, %r9d
movl $FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, %esi
orl PRIVATE(%rdi), %esi
movl $SYS_futex, %eax
xorl %edx, %edx
syscall
movq %rax, %r9
#if VALUE != 0
leaq -VALUE(%rdi), %rdi
#endif
xchgq %r8, %rdi
call __pthread_disable_asynccancel
.LcleanupEND:
movq %r8, %rdi
testq %r9, %r9
je 11f
cmpq $-EWOULDBLOCK, %r9
jne 3f
11:
#if VALUE == 0
movl (%rdi), %eax
#else
movl VALUE(%rdi), %eax
#endif
14: testl %eax, %eax
je 13b
leaq -1(%rax), %rcx
LOCK
#if VALUE == 0
cmpxchgl %ecx, (%rdi)
#else
cmpxchgl %ecx, VALUE(%rdi)
#endif
jne 14b
xorl %eax, %eax
15: LOCK
LP_OP(sub) $1, NWAITERS(%rdi)
leaq 8(%rsp), %rsp
cfi_adjust_cfa_offset(-8)
retq
cfi_adjust_cfa_offset(8)
3: negq %r9
movq errno@gottpoff(%rip), %rdx
movl %r9d, %fs:(%rdx)
orl $-1, %eax
jmp 15b
cfi_adjust_cfa_offset(-8)
6:
movq errno@gottpoff(%rip), %rdx
movl $EINVAL, %fs:(%rdx)
orl $-1, %eax
retq
16:
movq errno@gottpoff(%rip), %rdx
movl $ETIMEDOUT, %fs:(%rdx)
orl $-1, %eax
retq
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.Lreltmo:
pushq %r12
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r12, 0)
pushq %r13
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r13, 0)
pushq %r14
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r14, 0)
#ifdef __ASSUME_FUTEX_CLOCK_REALTIME
# define STACKFRAME 8
#else
# define STACKFRAME 24
#endif
subq $STACKFRAME, %rsp
cfi_adjust_cfa_offset(STACKFRAME)
movq %rdi, %r12
movq %rsi, %r13
LOCK
LP_OP(add) $1, NWAITERS(%r12)
7: xorl %esi, %esi
movq %rsp,%rdi
/* This call works because we directly jump to a system call entry
which preserves all the registers. */
call JUMPTARGET(__gettimeofday)
/* Compute relative timeout. */
movq 8(%rsp), %rax
movl $1000, %edi
mul %rdi /* Milli seconds to nano seconds. */
movq (%r13), %rdi
movq 8(%r13), %rsi
subq (%rsp), %rdi
subq %rax, %rsi
jns 5f
addq $1000000000, %rsi
decq %rdi
5: testq %rdi, %rdi
movl $ETIMEDOUT, %r14d
js 36f /* Time is already up. */
movq %rdi, (%rsp) /* Store relative timeout. */
movq %rsi, 8(%rsp)
.LcleanupSTART2:
call __pthread_enable_asynccancel
movl %eax, 16(%rsp)
movq %rsp, %r10
# if VALUE == 0
movq %r12, %rdi
# else
leaq VALUE(%r12), %rdi
# endif
# if FUTEX_WAIT == 0
movl PRIVATE(%rdi), %esi
# else
movl $FUTEX_WAIT, %esi
orl PRIVATE(%rdi), %esi
# endif
movl $SYS_futex, %eax
xorl %edx, %edx
syscall
movq %rax, %r14
movl 16(%rsp), %edi
call __pthread_disable_asynccancel
.LcleanupEND2:
testq %r14, %r14
je 9f
cmpq $-EWOULDBLOCK, %r14
jne 33f
9:
# if VALUE == 0
movl (%r12), %eax
# else
movl VALUE(%r12), %eax
# endif
8: testl %eax, %eax
je 7b
leaq -1(%rax), %rcx
LOCK
# if VALUE == 0
cmpxchgl %ecx, (%r12)
# else
cmpxchgl %ecx, VALUE(%r12)
# endif
jne 8b
xorl %eax, %eax
45: LOCK
LP_OP(sub) $1, NWAITERS(%r12)
addq $STACKFRAME, %rsp
cfi_adjust_cfa_offset(-STACKFRAME)
popq %r14
cfi_adjust_cfa_offset(-8)
cfi_restore(%r14)
popq %r13
cfi_adjust_cfa_offset(-8)
cfi_restore(%r13)
popq %r12
cfi_adjust_cfa_offset(-8)
cfi_restore(%r12)
retq
cfi_adjust_cfa_offset(STACKFRAME + 3 * 8)
cfi_rel_offset(%r12, STACKFRAME + 2 * 8)
cfi_rel_offset(%r13, STACKFRAME + 1 * 8)
cfi_rel_offset(%r14, STACKFRAME)
33: negq %r14
36:
movq errno@gottpoff(%rip), %rdx
movl %r14d, %fs:(%rdx)
orl $-1, %eax
jmp 45b
#endif
cfi_endproc
.size sem_timedwait,.-sem_timedwait
.type sem_timedwait_cleanup,@function
sem_timedwait_cleanup:
cfi_startproc
cfi_adjust_cfa_offset(8)
movq (%rsp), %rdi
LOCK
LP_OP(sub) $1, NWAITERS(%rdi)
movq %rax, %rdi
.LcallUR:
call _Unwind_Resume@PLT
hlt
.LENDCODE:
cfi_endproc
.size sem_timedwait_cleanup,.-sem_timedwait_cleanup
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.type sem_timedwait_cleanup2,@function
sem_timedwait_cleanup2:
cfi_startproc
cfi_adjust_cfa_offset(STACKFRAME + 3 * 8)
cfi_rel_offset(%r12, STACKFRAME + 2 * 8)
cfi_rel_offset(%r13, STACKFRAME + 1 * 8)
cfi_rel_offset(%r14, STACKFRAME)
LOCK
LP_OP(sub) $1, NWAITERS(%r12)
movq %rax, %rdi
movq STACKFRAME(%rsp), %r14
movq STACKFRAME+8(%rsp), %r13
movq STACKFRAME+16(%rsp), %r12
.LcallUR2:
call _Unwind_Resume@PLT
hlt
.LENDCODE2:
cfi_endproc
.size sem_timedwait_cleanup2,.-sem_timedwait_cleanup2
#endif
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte DW_EH_PE_omit # @LPStart format
.byte DW_EH_PE_omit # @TType format
.byte DW_EH_PE_uleb128 # call-site format
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.uleb128 .LcleanupSTART-.LSTARTCODE
.uleb128 .LcleanupEND-.LcleanupSTART
.uleb128 sem_timedwait_cleanup-.LSTARTCODE
.uleb128 0
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.uleb128 .LcleanupSTART2-.LSTARTCODE
.uleb128 .LcleanupEND2-.LcleanupSTART2
.uleb128 sem_timedwait_cleanup2-.LSTARTCODE
.uleb128 0
#endif
.uleb128 .LcallUR-.LSTARTCODE
.uleb128 .LENDCODE-.LcallUR
.uleb128 0
.uleb128 0
#ifndef __ASSUME_FUTEX_CLOCK_REALTIME
.uleb128 .LcallUR2-.LSTARTCODE
.uleb128 .LENDCODE2-.LcallUR2
.uleb128 0
.uleb128 0
#endif
.Lcstend:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align LP_SIZE
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, LP_SIZE
DW.ref.__gcc_personality_v0:
ASM_ADDR __gcc_personality_v0
#endif

47
sysdeps/unix/sysv/linux/x86_64/sem_trywait.S
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@ -1,47 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
.text
.globl sem_trywait
.type sem_trywait,@function
.align 16
sem_trywait:
movl (%rdi), %eax
2: testl %eax, %eax
jz 1f
leal -1(%rax), %edx
LOCK
cmpxchgl %edx, (%rdi)
jne 2b
xorl %eax, %eax
retq
1:
movq errno@gottpoff(%rip), %rdx
movl $EAGAIN, %fs:(%rdx)
orl $-1, %eax
retq
.size sem_trywait,.-sem_trywait

176
sysdeps/unix/sysv/linux/x86_64/sem_wait.S
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@ -1,176 +0,0 @@
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
#include <lowlevellock.h>
#include <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
.text
.globl sem_wait
.type sem_wait,@function
.align 16
sem_wait:
.LSTARTCODE:
cfi_startproc
#ifdef SHARED
cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect,
DW.ref.__gcc_personality_v0)
cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART)
#else
cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0)
cfi_lsda(DW_EH_PE_udata4, .LexceptSTART)
#endif
#if VALUE == 0
movl (%rdi), %eax
#else
movl VALUE(%rdi), %eax
#endif
2: testl %eax, %eax
je 1f
leal -1(%rax), %edx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%rdi)
#else
cmpxchgl %edx, VALUE(%rdi)
#endif
jne 2b
xorl %eax, %eax
retq
/* This push is only needed to store the sem_t pointer for the
exception handler. */
1: pushq %rdi
cfi_adjust_cfa_offset(8)
LOCK
LP_OP(add) $1, NWAITERS(%rdi)
.LcleanupSTART:
6: call __pthread_enable_asynccancel
movl %eax, %r8d
xorq %r10, %r10
movl $SYS_futex, %eax
#if FUTEX_WAIT == 0
movl PRIVATE(%rdi), %esi
#else
movl $FUTEX_WAIT, %esi
orl PRIVATE(%rdi), %esi
#endif
xorl %edx, %edx
syscall
movq %rax, %rcx
xchgq %r8, %rdi
call __pthread_disable_asynccancel
.LcleanupEND:
movq %r8, %rdi
testq %rcx, %rcx
je 3f
cmpq $-EWOULDBLOCK, %rcx
jne 4f
3:
#if VALUE == 0
movl (%rdi), %eax
#else
movl VALUE(%rdi), %eax
#endif
5: testl %eax, %eax
je 6b
leal -1(%rax), %edx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%rdi)
#else
cmpxchgl %edx, VALUE(%rdi)
#endif
jne 5b
xorl %eax, %eax
9: LOCK
LP_OP(sub) $1, NWAITERS(%rdi)
leaq 8(%rsp), %rsp
cfi_adjust_cfa_offset(-8)
retq
cfi_adjust_cfa_offset(8)
4: negq %rcx
movq errno@gottpoff(%rip), %rdx
movl %ecx, %fs:(%rdx)
orl $-1, %eax
jmp 9b
.size sem_wait,.-sem_wait
.type sem_wait_cleanup,@function
sem_wait_cleanup:
movq (%rsp), %rdi
LOCK
LP_OP(sub) $1, NWAITERS(%rdi)
movq %rax, %rdi
.LcallUR:
call _Unwind_Resume@PLT
hlt
.LENDCODE:
cfi_endproc
.size sem_wait_cleanup,.-sem_wait_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte DW_EH_PE_omit # @LPStart format
.byte DW_EH_PE_omit # @TType format
.byte DW_EH_PE_uleb128 # call-site format
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.uleb128 .LcleanupSTART-.LSTARTCODE
.uleb128 .LcleanupEND-.LcleanupSTART
.uleb128 sem_wait_cleanup-.LSTARTCODE
.uleb128 0
.uleb128 .LcallUR-.LSTARTCODE
.uleb128 .LENDCODE-.LcallUR
.uleb128 0
.uleb128 0
.Lcstend:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align LP_SIZE
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, LP_SIZE
DW.ref.__gcc_personality_v0:
ASM_ADDR __gcc_personality_v0
#endif