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/* Copyright (C) 2002, 2003, 2005, 2007 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 <shlib-compat.h>
#include <pthread-errnos.h>
#include <structsem.h>
#ifndef UP
# define LOCK lock
#else
# define
#endif
#define SYS_futex 202
#define FUTEX_WAIT 0
.text
.globl sem_wait
.type sem_wait,@function
.align 16
sem_wait:
.LSTARTCODE:
pushq %r12
.Lpush_r12:
pushq %r13
.Lpush_r13:
movq %rdi, %r13
#if VALUE == 0
movl (%r13), %eax
#else
movl VALUE(%r13), %eax
#endif
2: testl %eax, %eax
je 1f
leal -1(%rax), %edx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%r13)
#else
cmpxchgl %edx, VALUE(%r13)
#endif
jne 2b
7: xorl %eax, %eax
9: popq %r13
.Lpop_r13:
popq %r12
.Lpop_r12:
retq
.Lafter_retq:
1: LOCK
addq $1, NWAITERS(%r13)
.LcleanupSTART:
6: call __pthread_enable_asynccancel
movl %eax, %r8d
xorq %r10, %r10
movl $SYS_futex, %eax
movq %r13, %rdi
#if FUTEX_WAIT == 0
movl PRIVATE(%rdi), %esi
#else
movl $FUTEX_WAIT, %esi
orl PRIVATE(%rdi), %esi
#endif
xorl %edx, %edx
syscall
movq %rax, %r12
movl %r8d, %edi
call __pthread_disable_asynccancel
.LcleanupEND:
testq %r12, %r12
je 3f
cmpq $-EWOULDBLOCK, %r12
jne 4f
3:
#if VALUE == 0
movl (%r13), %eax
#else
movl VALUE(%r13), %eax
#endif
5: testl %eax, %eax
je 6b
leal -1(%rax), %edx
LOCK
#if VALUE == 0
cmpxchgl %edx, (%r13)
#else
cmpxchgl %edx, VALUE(%r13)
#endif
jne 5b
LOCK
subq $1, NWAITERS(%r13)
jmp 7b
4: negq %r12
#if USE___THREAD
movq errno@gottpoff(%rip), %rdx
movl %r12d, %fs:(%rdx)
#else
callq __errno_location@plt
movl %r12d, (%rax)
#endif
orl $-1, %eax
LOCK
subq $1, NWAITERS(%r13)
jmp 9b
.size sem_wait,.-sem_wait
.type sem_wait_cleanup,@function
sem_wait_cleanup:
LOCK
subq $1, NWAITERS(%r13)
movq %rax, %rdi
.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 -8 # Data alignment factor.
.byte 16 # 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 10 # Augmentation value length.
.byte 0x0 # Personality: absolute
.quad __gcc_personality_v0
.byte 0x0 # LSDA Encoding: absolute
#endif
.byte 0x0c # DW_CFA_def_cfa
.uleb128 7
.uleb128 8
.byte 0x90 # DW_CFA_offset, column 0x10
.uleb128 1
.align 8
.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.
.long .LENDCODE-.LSTARTCODE # Length of the code.
.uleb128 4 # Augmentation size
.long .LexceptSTART-.
#else
.quad .LSTARTCODE # Start address of the code.
.quad .LENDCODE-.LSTARTCODE # Length of the code.
.uleb128 8 # Augmentation size
.quad .LexceptSTART
#endif
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_r12-.LSTARTCODE
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0x8c # DW_CFA_offset %r12
.uleb128 2
.byte 4 # DW_CFA_advance_loc4
.long .Lpush_r13-.Lpush_r12
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 24
.byte 0x8d # DW_CFA_offset %r13
.uleb128 3
.byte 4 # DW_CFA_advance_loc4
.long .Lpop_r13-.Lpush_r13
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 16
.byte 0xcd # DW_CFA_restore %r13
.byte 4 # DW_CFA_advance_loc4
.long .Lpop_r12-.Lpop_r13
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 8
.byte 0xcc # DW_CFA_restore %r12
.byte 4 # DW_CFA_advance_loc4
.long .Lafter_retq-.Lpop_r12
.byte 14 # DW_CFA_def_cfa_offset
.uleb128 24
.byte 0x8c # DW_CFA_offset %r12
.uleb128 2
.byte 0x8d # DW_CFA_offset %r13
.uleb128 3
.align 8
.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 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
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