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+# -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+#
+# 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.
+#
+# The Original Code is the Netscape Portable Runtime (NSPR).
+# 
+# The Initial Developer of the Original Code is Netscape
+# Communications Corporation.  Portions created by Netscape are
+# Copyright (C) 2003 Netscape Communications Corporation.  All
+# Rights Reserved.
+#
+# Contributor(s):
+#   Josh Aas <josh@mozilla.com>
+#
+# Alternatively, the contents of this file may be used under the
+# terms of the GNU General Public License Version 2 or later (the
+# "GPL"), in which case the provisions of the GPL are applicable
+# instead of those above.  If you wish to allow use of your
+# version of this file only under the terms of the GPL and not to
+# allow others to use your version of this file under the MPL,
+# indicate your decision by deleting the provisions above and
+# replace them with the notice and other provisions required by
+# the GPL.  If you do not delete the provisions above, a recipient
+# may use your version of this file under either the MPL or the
+# GPL.
+#
+
+#
+# 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
+    .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
+    .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
+    .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
+    .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