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76 lines
1.6 KiB
ArmAsm
76 lines
1.6 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_post
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.type sem_post,@function
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.align 16
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sem_post:
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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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0: cmpl $SEM_VALUE_MAX, %eax
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je 3f
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leal 1(%rax), %esi
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LOCK
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#if VALUE == 0
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cmpxchgl %esi, (%rdi)
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#else
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cmpxchgl %esi, VALUE(%rdi)
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#endif
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jnz 0b
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LP_OP(cmp) $0, NWAITERS(%rdi)
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je 2f
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movl $SYS_futex, %eax
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movl $FUTEX_WAKE, %esi
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orl PRIVATE(%rdi), %esi
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movl $1, %edx
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syscall
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testq %rax, %rax
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js 1f
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2: xorl %eax, %eax
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retq
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1:
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movl $EINVAL, %eax
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jmp 4f
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3:
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movl $EOVERFLOW, %eax
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4:
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movq errno@gottpoff(%rip), %rdx
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movl %eax, %fs:(%rdx)
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orl $-1, %eax
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retq
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.size sem_post,.-sem_post
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