diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/i486/sem_post.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/i486/sem_post.S | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/i486/sem_post.S b/sysdeps/unix/sysv/linux/i386/i486/sem_post.S new file mode 100644 index 0000000000..bc091a0926 --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/i486/sem_post.S @@ -0,0 +1,150 @@ +/* Copyright (C) 2002-2014 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <shlib-compat.h> +#include <pthread-errnos.h> +#include <structsem.h> +#include <lowlevellock.h> + + + .text + + .globl __new_sem_post + .type __new_sem_post,@function + .align 16 +__new_sem_post: + cfi_startproc + pushl %ebx + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) + + movl 8(%esp), %ebx + +#if VALUE == 0 + movl (%ebx), %eax +#else + movl VALUE(%ebx), %eax +#endif +0: cmpl $SEM_VALUE_MAX, %eax + je 3f + leal 1(%eax), %edx + LOCK +#if VALUE == 0 + cmpxchgl %edx, (%ebx) +#else + cmpxchgl %edx, VALUE(%ebx) +#endif + jnz 0b + + cmpl $0, NWAITERS(%ebx) + je 2f + + movl $FUTEX_WAKE, %ecx + orl PRIVATE(%ebx), %ecx + movl $1, %edx + movl $SYS_futex, %eax + ENTER_KERNEL + + testl %eax, %eax + js 1f + +2: xorl %eax, %eax + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) +1: +#ifdef PIC + SETUP_PIC_REG(bx) +#else + movl $4f, %ebx +4: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx +#ifdef NO_TLS_DIRECT_SEG_REFS + movl errno@gotntpoff(%ebx), %edx + addl %gs:0, %edx + movl $EINVAL, (%edx) +#else + movl errno@gotntpoff(%ebx), %edx + movl $EINVAL, %gs:(%edx) +#endif + + orl $-1, %eax + popl %ebx + ret + +3: +#ifdef PIC + SETUP_PIC_REG(bx) +#else + movl $5f, %ebx +5: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx +#ifdef NO_TLS_DIRECT_SEG_REFS + movl errno@gotntpoff(%ebx), %edx + addl %gs:0, %edx + movl $EOVERFLOW, (%edx) +#else + movl errno@gotntpoff(%ebx), %edx + movl $EOVERFLOW, %gs:(%edx) +#endif + + orl $-1, %eax + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + cfi_endproc + .size __new_sem_post,.-__new_sem_post + versioned_symbol(libpthread, __new_sem_post, sem_post, GLIBC_2_1) +#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) + .global __old_sem_post + .type __old_sem_post,@function +__old_sem_post: + cfi_startproc + pushl %ebx + cfi_adjust_cfa_offset(4) + cfi_offset(%ebx, -8) + + movl 8(%esp), %ebx + LOCK + addl $1, (%ebx) + + movl $SYS_futex, %eax + movl $FUTEX_WAKE, %ecx + movl $1, %edx + ENTER_KERNEL + + testl %eax, %eax + js 1b + + xorl %eax, %eax + popl %ebx + cfi_adjust_cfa_offset(-4) + cfi_restore(%ebx) + ret + cfi_endproc + .size __old_sem_post,.-__old_sem_post + compat_symbol(libpthread, __old_sem_post, sem_post, GLIBC_2_0) +#endif |