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// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// PRInt32 _PR_x86_AtomicIncrement(PRInt32 *val)
//
// Atomically increment the integer pointed to by 'val' and return
// the result of the increment.
//
.text
.globl _PR_x86_AtomicIncrement
.align 4
_PR_x86_AtomicIncrement:
movl 4(%esp), %ecx
movl $1, %eax
lock
xaddl %eax, (%ecx)
incl %eax
ret
// PRInt32 _PR_x86_AtomicDecrement(PRInt32 *val)
//
// Atomically decrement the integer pointed to by 'val' and return
// the result of the decrement.
//
.text
.globl _PR_x86_AtomicDecrement
.align 4
_PR_x86_AtomicDecrement:
movl 4(%esp), %ecx
movl $-1, %eax
lock
xaddl %eax, (%ecx)
decl %eax
ret
// PRInt32 _PR_x86_AtomicSet(PRInt32 *val, PRInt32 newval)
//
// Atomically set the integer pointed to by 'val' to the new
// value 'newval' and return the old value.
//
// An alternative implementation:
// .text
// .globl _PR_x86_AtomicSet
// .align 4
//_PR_x86_AtomicSet:
// movl 4(%esp), %ecx
// movl 8(%esp), %edx
// movl (%ecx), %eax
//retry:
// lock
// cmpxchgl %edx, (%ecx)
// jne retry
// ret
//
.text
.globl _PR_x86_AtomicSet
.align 4
_PR_x86_AtomicSet:
movl 4(%esp), %ecx
movl 8(%esp), %eax
xchgl %eax, (%ecx)
ret
// PRInt32 _PR_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val)
//
// Atomically add 'val' to the integer pointed to by 'ptr'
// and return the result of the addition.
//
.text
.globl _PR_x86_AtomicAdd
.align 4
_PR_x86_AtomicAdd:
movl 4(%esp), %ecx
movl 8(%esp), %eax
movl %eax, %edx
lock
xaddl %eax, (%ecx)
addl %edx, %eax
ret
// Magic indicating no need for an executable stack
.section .note.GNU-stack, "", @progbits
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