nspr-4.8.6/mozilla/nsprpub/pr/src/md/unix/os_Darwin_x86.s

# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
#
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
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# The Original Code is the Netscape Portable Runtime (NSPR).
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 2003
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
#   Josh Aas <josh@mozilla.com>
#
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# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
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# ***** END LICENSE BLOCK *****

#
# Based on os_Linux_x86.s
#

#
# PRInt32 __PR_Darwin_x86_AtomicIncrement(PRInt32 *val);
#
# Atomically increment the integer pointed to by 'val' and return
# the result of the increment.
#
    .text
    .globl __PR_Darwin_x86_AtomicIncrement
    .private_extern __PR_Darwin_x86_AtomicIncrement
    .align 4
__PR_Darwin_x86_AtomicIncrement:
    movl 4(%esp), %ecx
    movl $1, %eax
    lock
    xaddl %eax, (%ecx)
    incl %eax
    ret

#
# PRInt32 __PR_Darwin_x86_AtomicDecrement(PRInt32 *val);
#
# Atomically decrement the integer pointed to by 'val' and return
# the result of the decrement.
#
    .text
    .globl __PR_Darwin_x86_AtomicDecrement
    .private_extern __PR_Darwin_x86_AtomicDecrement
    .align 4
__PR_Darwin_x86_AtomicDecrement:
    movl 4(%esp), %ecx
    movl $-1, %eax
    lock
    xaddl %eax, (%ecx)
    decl %eax
    ret

#
# PRInt32 __PR_Darwin_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
#
# Atomically set the integer pointed to by 'val' to the new
# value 'newval' and return the old value.
#
    .text
    .globl __PR_Darwin_x86_AtomicSet
    .private_extern __PR_Darwin_x86_AtomicSet
    .align 4
__PR_Darwin_x86_AtomicSet:
    movl 4(%esp), %ecx
    movl 8(%esp), %eax
    xchgl %eax, (%ecx)
    ret

#
# PRInt32 __PR_Darwin_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_Darwin_x86_AtomicAdd
    .private_extern __PR_Darwin_x86_AtomicAdd
    .align 4
__PR_Darwin_x86_AtomicAdd:
    movl 4(%esp), %ecx
    movl 8(%esp), %eax
    movl %eax, %edx
    lock
    xaddl %eax, (%ecx)
    addl %edx, %eax
    ret