diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S new file mode 100644 index 000000000..63ecd063a --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/x86_64/sem_wait.S @@ -0,0 +1,120 @@ +/* Copyright (C) 2002, 2003, 2005 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> + +#ifndef UP +# define LOCK lock +#else +# define +#endif + +#define SYS_futex 202 + + + .text + + .globl sem_wait + .type sem_wait,@function + .align 16 + cfi_startproc +sem_wait: + /* First check for cancellation. */ + movl %fs:CANCELHANDLING, %eax + andl $0xfffffff9, %eax + cmpl $8, %eax + je 4f + + pushq %r12 + cfi_adjust_cfa_offset(8) + cfi_offset(12, -16) + pushq %r13 + cfi_adjust_cfa_offset(8) + movq %rdi, %r13 + cfi_offset(13, -24) + +3: movl (%r13), %eax +2: testl %eax, %eax + je 1f + + leaq -1(%rax), %rdx + LOCK + cmpxchgl %edx, (%r13) + jne 2b + xorl %eax, %eax + + popq %r13 + cfi_adjust_cfa_offset(-8) + cfi_restore(13) + popq %r12 + cfi_adjust_cfa_offset(-8) + cfi_restore(12) + + retq + + cfi_adjust_cfa_offset(16) + cfi_offset(12, -16) + cfi_offset(13, -24) +1: call __pthread_enable_asynccancel + movl %eax, %r8d + + xorq %r10, %r10 + movl $SYS_futex, %eax + movq %r13, %rdi + movq %r10, %rsi + movq %r10, %rdx + syscall + movq %rax, %r12 + + movl %r8d, %edi + call __pthread_disable_asynccancel + + testq %r12, %r12 + je 3b + cmpq $-EWOULDBLOCK, %r12 + je 3b + 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 + + popq %r13 + cfi_adjust_cfa_offset(-8) + cfi_restore(13) + popq %r12 + cfi_adjust_cfa_offset(-8) + cfi_restore(12) + + retq + +4: /* Canceled. */ + movq $0xffffffffffffffff, %fs:RESULT + LOCK + orl $0x10, %fs:CANCELHANDLING + movq %fs:CLEANUP_JMP_BUF, %rdi + jmp HIDDEN_JUMPTARGET (__pthread_unwind) + cfi_endproc + .size sem_wait,.-sem_wait |