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/* Copyright (C) 2002, 2003, 2005, 2007, 2009 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <lowlevellock.h>
#include <pthread-errnos.h>
#include <structsem.h>
.text
.globl sem_wait
.type sem_wait,@function
.align 16
sem_wait:
.LSTARTCODE:
cfi_startproc
#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
addq $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
subq $1, NWAITERS(%rdi)
leaq 8(%rsp), %rsp
cfi_adjust_cfa_offset(-8)
retq
cfi_adjust_cfa_offset(8)
4: negq %rcx
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl %ecx, %fs:(%rdx)
#else
# error "not supported. %rcx and %rdi must be preserved"
callq __errno_location@plt
movl %ecx, (%rax)
#endif
orl $-1, %eax
jmp 9b
.size sem_wait,.-sem_wait
.type sem_wait_cleanup,@function
sem_wait_cleanup:
movq (%rsp), %rdi
LOCK
subq $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 8
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 8
DW.ref.__gcc_personality_v0:
.quad __gcc_personality_v0
#endif
|
