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177 lines
3.6 KiB
ArmAsm
177 lines
3.6 KiB
ArmAsm
/* Copyright (C) 2002-2014 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <lowlevellock.h>
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#include <shlib-compat.h>
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#include <pthread-errnos.h>
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#include <structsem.h>
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.text
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.globl sem_wait
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.type sem_wait,@function
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.align 16
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sem_wait:
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.LSTARTCODE:
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cfi_startproc
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#ifdef SHARED
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cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect,
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DW.ref.__gcc_personality_v0)
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cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART)
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#else
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cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0)
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cfi_lsda(DW_EH_PE_udata4, .LexceptSTART)
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#endif
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#if VALUE == 0
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movl (%rdi), %eax
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#else
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movl VALUE(%rdi), %eax
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#endif
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2: testl %eax, %eax
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je 1f
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leal -1(%rax), %edx
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LOCK
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#if VALUE == 0
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cmpxchgl %edx, (%rdi)
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#else
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cmpxchgl %edx, VALUE(%rdi)
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#endif
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jne 2b
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xorl %eax, %eax
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retq
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/* This push is only needed to store the sem_t pointer for the
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exception handler. */
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1: pushq %rdi
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cfi_adjust_cfa_offset(8)
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LOCK
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LP_OP(add) $1, NWAITERS(%rdi)
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.LcleanupSTART:
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6: call __pthread_enable_asynccancel
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movl %eax, %r8d
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xorq %r10, %r10
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movl $SYS_futex, %eax
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#if FUTEX_WAIT == 0
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movl PRIVATE(%rdi), %esi
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#else
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movl $FUTEX_WAIT, %esi
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orl PRIVATE(%rdi), %esi
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#endif
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xorl %edx, %edx
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syscall
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movq %rax, %rcx
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xchgq %r8, %rdi
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call __pthread_disable_asynccancel
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.LcleanupEND:
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movq %r8, %rdi
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testq %rcx, %rcx
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je 3f
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cmpq $-EWOULDBLOCK, %rcx
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jne 4f
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3:
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#if VALUE == 0
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movl (%rdi), %eax
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#else
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movl VALUE(%rdi), %eax
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#endif
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5: testl %eax, %eax
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je 6b
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leal -1(%rax), %edx
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LOCK
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#if VALUE == 0
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cmpxchgl %edx, (%rdi)
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#else
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cmpxchgl %edx, VALUE(%rdi)
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#endif
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jne 5b
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xorl %eax, %eax
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9: LOCK
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LP_OP(sub) $1, NWAITERS(%rdi)
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leaq 8(%rsp), %rsp
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cfi_adjust_cfa_offset(-8)
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retq
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cfi_adjust_cfa_offset(8)
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4: negq %rcx
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movq errno@gottpoff(%rip), %rdx
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movl %ecx, %fs:(%rdx)
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orl $-1, %eax
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jmp 9b
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.size sem_wait,.-sem_wait
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.type sem_wait_cleanup,@function
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sem_wait_cleanup:
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movq (%rsp), %rdi
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LOCK
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LP_OP(sub) $1, NWAITERS(%rdi)
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movq %rax, %rdi
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.LcallUR:
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call _Unwind_Resume@PLT
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hlt
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.LENDCODE:
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cfi_endproc
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.size sem_wait_cleanup,.-sem_wait_cleanup
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.section .gcc_except_table,"a",@progbits
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.LexceptSTART:
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.byte DW_EH_PE_omit # @LPStart format
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.byte DW_EH_PE_omit # @TType format
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.byte DW_EH_PE_uleb128 # call-site format
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.uleb128 .Lcstend-.Lcstbegin
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.Lcstbegin:
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.uleb128 .LcleanupSTART-.LSTARTCODE
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.uleb128 .LcleanupEND-.LcleanupSTART
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.uleb128 sem_wait_cleanup-.LSTARTCODE
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.uleb128 0
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.uleb128 .LcallUR-.LSTARTCODE
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.uleb128 .LENDCODE-.LcallUR
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.uleb128 0
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.uleb128 0
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.Lcstend:
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#ifdef SHARED
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.hidden DW.ref.__gcc_personality_v0
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.weak DW.ref.__gcc_personality_v0
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.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
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.align LP_SIZE
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.type DW.ref.__gcc_personality_v0, @object
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.size DW.ref.__gcc_personality_v0, LP_SIZE
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DW.ref.__gcc_personality_v0:
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ASM_ADDR __gcc_personality_v0
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#endif
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