| /* 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 <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 |
| 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 |
