Bugzilla Bug 322287: Implemented NSPR atomic routines in x86 assembly code NSPRPUB_PRE_4_2_CLIENT_BRANCH
authorwtchang%redhat.com
Mon, 09 Jan 2006 18:51:33 +0000
branchNSPRPUB_PRE_4_2_CLIENT_BRANCH
changeset 3538 9e0d2e60afb0fdc656d953d0fff7f9666e609336
parent 3536 7c56d641e2fbf99c7274a35e43f26d050814e750
child 3539 97f15027a5393ccab3765a61edf926c110991305
push idunknown
push userunknown
push dateunknown
bugs322287
Bugzilla Bug 322287: Implemented NSPR atomic routines in x86 assembly code for Intel Macs. The patch is contributed by Josh Aas <joshmoz@gmail.com>. r=mark.mentovai,wtc. Modified files: configure configure.in _darwin.h Added file: os_Darwin_x86.s Tag: NSPRPUB_PRE_4_2_CLIENT_BRANCH
configure
configure.in
pr/include/md/_darwin.h
pr/src/md/unix/os_Darwin_x86.s
--- a/configure
+++ b/configure
@@ -3285,38 +3285,37 @@ EOF
     CFLAGS="$CFLAGS -Wmost -fno-common"
     case "${target_cpu}" in
         i*86*)
             cat >> confdefs.h <<\EOF
 #define i386 1
 EOF
 
             CPU_ARCH=i386
+            PR_MD_ASFILES=os_Darwin_x86.s
             ;;
         *)
             cat >> confdefs.h <<\EOF
 #define ppc 1
 EOF
 
             CPU_ARCH=ppc
+            PR_MD_ASFILES=os_Darwin_ppc.s
             ;;
     esac
     DSO_CFLAGS=-fPIC
     DSO_LDOPTS='-dynamiclib -compatibility_version 1 -current_version 1 -all_load -install_name @executable_path/$@ -headerpad_max_install_names'
     # Use the standard preprocessor (cpp)
     CFLAGS="$CFLAGS -no-cpp-precomp"
     MKSHLIB='$(CC) -arch $(CPU_ARCH) $(DSO_LDOPTS) -o $@'
     STRIP="$STRIP -x -S"
     DLL_SUFFIX=dylib
     USE_PTHREADS=1
     MDCPUCFG_H=_darwin.cfg
     PR_MD_CSRCS=darwin.c
-    if test "$CPU_ARCH" = "ppc"; then
-        PR_MD_ASFILES=os_Darwin_ppc.s
-    fi
 
     # Add Mac OS X support for loading CFM & CFBundle plugins
     if test -f /System/Library/Frameworks/Carbon.framework/Carbon; then
         cat >> confdefs.h <<\EOF
 #define XP_MACOSX 1
 EOF
 
         OS_TARGET=MacOSX
@@ -4399,27 +4398,27 @@ EOF
     if test -z "$GNU_CC"; then
         CC="$CC -std1 -ieee_with_inexact"
         if test "$OS_RELEASE" != "V2.0"; then
             CC="$CC -readonly_strings"
         fi
         _OPTIMIZE_FLAGS="$_OPTIMIZE_FLAGS -Olimit 4000"
         ac_safe=`echo "machine/builtins.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for machine/builtins.h""... $ac_c" 1>&6
-echo "configure:4408: checking for machine/builtins.h" >&5
+echo "configure:4407: checking for machine/builtins.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4413 "configure"
+#line 4412 "configure"
 #include "confdefs.h"
 #include <machine/builtins.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4418: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4417: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
   eval "ac_cv_header_$ac_safe=yes"
 else
   echo "$ac_err" >&5
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
@@ -4971,63 +4970,63 @@ if test -z "$SKIP_LIBRARY_CHECKS"; then
 
 
 
 case $target in
 *-darwin*|*-beos*)
     ;;
 *)
     echo $ac_n "checking for dlopen in -ldl""... $ac_c" 1>&6
-echo "configure:4980: checking for dlopen in -ldl" >&5
+echo "configure:4979: checking for dlopen in -ldl" >&5
 ac_lib_var=`echo dl'_'dlopen | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   ac_save_LIBS="$LIBS"
 LIBS="-ldl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 4988 "configure"
+#line 4987 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
     builtin and then its argument prototype would still apply.  */
 char dlopen();
 
 int main() {
 dlopen()
 ; return 0; }
 EOF
-if { (eval echo configure:4999: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4998: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=no"
 fi
 rm -f conftest*
 LIBS="$ac_save_LIBS"
 
 fi
 if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   ac_safe=`echo "dlfcn.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for dlfcn.h""... $ac_c" 1>&6
-echo "configure:5016: checking for dlfcn.h" >&5
+echo "configure:5015: checking for dlfcn.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5021 "configure"
+#line 5020 "configure"
 #include "confdefs.h"
 #include <dlfcn.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:5026: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:5025: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
   eval "ac_cv_header_$ac_safe=yes"
 else
   echo "$ac_err" >&5
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
@@ -5050,23 +5049,23 @@ fi
     ;;
 esac
 
 
 
 
 if test $ac_cv_prog_gcc = yes; then
     echo $ac_n "checking whether ${CC-cc} needs -traditional""... $ac_c" 1>&6
-echo "configure:5059: checking whether ${CC-cc} needs -traditional" >&5
+echo "configure:5058: checking whether ${CC-cc} needs -traditional" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc_traditional'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
     ac_pattern="Autoconf.*'x'"
   cat > conftest.$ac_ext <<EOF
-#line 5065 "configure"
+#line 5064 "configure"
 #include "confdefs.h"
 #include <sgtty.h>
 Autoconf TIOCGETP
 EOF
 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
   egrep "$ac_pattern" >/dev/null 2>&1; then
   rm -rf conftest*
   ac_cv_prog_gcc_traditional=yes
@@ -5074,17 +5073,17 @@ else
   rm -rf conftest*
   ac_cv_prog_gcc_traditional=no
 fi
 rm -f conftest*
 
 
   if test $ac_cv_prog_gcc_traditional = no; then
     cat > conftest.$ac_ext <<EOF
-#line 5083 "configure"
+#line 5082 "configure"
 #include "confdefs.h"
 #include <termio.h>
 Autoconf TCGETA
 EOF
 if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
   egrep "$ac_pattern" >/dev/null 2>&1; then
   rm -rf conftest*
   ac_cv_prog_gcc_traditional=yes
@@ -5098,22 +5097,22 @@ echo "$ac_t""$ac_cv_prog_gcc_traditional
   if test $ac_cv_prog_gcc_traditional = yes; then
     CC="$CC -traditional"
   fi
 fi
 
 for ac_func in lchown strerror
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5107: checking for $ac_func" >&5
+echo "configure:5106: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5112 "configure"
+#line 5111 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
 #include <assert.h>
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
     builtin and then its argument prototype would still apply.  */
 char $ac_func();
@@ -5126,17 +5125,17 @@ int main() {
 #if defined (__stub_$ac_func) || defined (__stub___$ac_func)
 choke me
 #else
 $ac_func();
 #endif
 
 ; return 0; }
 EOF
-if { (eval echo configure:5135: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5134: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
   echo "configure: failed program was:" >&5
   cat conftest.$ac_ext >&5
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=no"
 fi
@@ -5167,17 +5166,17 @@ if test "${enable_strip+set}" = set; the
 fi
 
 
 case "${target_os}" in
 hpux*)
 if test -z "$GNU_CC"; then
 
     echo $ac_n "checking for +Olit support""... $ac_c" 1>&6
-echo "configure:5176: checking for +Olit support" >&5
+echo "configure:5175: checking for +Olit support" >&5
 if eval "test \"`echo '$''{'ac_cv_hpux_usable_olit_option'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
                   ac_cv_hpux_usable_olit_option=no
         rm -f conftest*
         echo 'int main() { return 0; }' | cat > conftest.c
         ${CC-cc} ${CFLAGS} +Olit=all -o conftest conftest.c > conftest.out 2>&1
         if test $? -eq 0; then
@@ -5206,17 +5205,17 @@ esac
 
 case "$target_os" in
 darwin*)
     _HAVE_PTHREADS=1
     ;;
 *)
     
 echo $ac_n "checking for pthread_create in -lpthreads""... $ac_c" 1>&6
-echo "configure:5215: checking for pthread_create in -lpthreads" >&5
+echo "configure:5214: checking for pthread_create in -lpthreads" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
     int main() { 
         pthread_t t;
         if (!pthread_create(&t, 0, &foo, 0)) {
             pthread_join(t, 0);
         }
@@ -5228,17 +5227,17 @@ echo "
     rm -f dummy.c dummy${ac_exeext} ;
     if test "$_res" = "0"; then
         echo "$ac_t""yes" 1>&6
         _HAVE_PTHREADS=1 _PTHREAD_LDFLAGS="-lpthreads"
     else
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lpthread""... $ac_c" 1>&6
-echo "configure:5237: checking for pthread_create in -lpthread" >&5
+echo "configure:5236: checking for pthread_create in -lpthread" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
     int main() { 
         pthread_t t;
         if (!pthread_create(&t, 0, &foo, 0)) {
             pthread_join(t, 0);
         }
@@ -5250,17 +5249,17 @@ echo "
     rm -f dummy.c dummy${ac_exeext} ;
     if test "$_res" = "0"; then
         echo "$ac_t""yes" 1>&6
         _HAVE_PTHREADS=1 _PTHREAD_LDFLAGS="-lpthread"
     else
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc_r""... $ac_c" 1>&6
-echo "configure:5259: checking for pthread_create in -lc_r" >&5
+echo "configure:5258: checking for pthread_create in -lc_r" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
     int main() { 
         pthread_t t;
         if (!pthread_create(&t, 0, &foo, 0)) {
             pthread_join(t, 0);
         }
@@ -5272,17 +5271,17 @@ echo "
     rm -f dummy.c dummy${ac_exeext} ;
     if test "$_res" = "0"; then
         echo "$ac_t""yes" 1>&6
         _HAVE_PTHREADS=1 _PTHREAD_LDFLAGS="-lc_r"
     else
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc""... $ac_c" 1>&6
-echo "configure:5281: checking for pthread_create in -lc" >&5
+echo "configure:5280: checking for pthread_create in -lc" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
     int main() { 
         pthread_t t;
         if (!pthread_create(&t, 0, &foo, 0)) {
             pthread_join(t, 0);
         }
@@ -5426,17 +5425,17 @@ EOF
     fi
 fi
 
 
 if test -n "$USE_PTHREADS"; then
       rm -f conftest*
    ac_cv_have_dash_pthread=no
    echo $ac_n "checking whether ${CC-cc} accepts -pthread""... $ac_c" 1>&6
-echo "configure:5435: checking whether ${CC-cc} accepts -pthread" >&5
+echo "configure:5434: checking whether ${CC-cc} accepts -pthread" >&5
    echo 'int main() { return 0; }' | cat > conftest.c
    ${CC-cc} -pthread -o conftest conftest.c > conftest.out 2>&1
    if test $? -eq 0; then
 	if test -z "`egrep -i '(unrecognize|unknown)' conftest.out | grep pthread`" && test -z "`egrep -i '(error|incorrect)' conftest.out`" ; then
 	    ac_cv_have_dash_pthread=yes
 		case "$target_os" in
 	    freebsd*)
 # Freebsd doesn't use -pthread for compiles, it uses them for linking
@@ -5449,17 +5448,17 @@ echo "configure:5435: checking whether $
 	fi
     fi
     rm -f conftest*
     echo "$ac_t""$ac_cv_have_dash_pthread" 1>&6
 
 			    ac_cv_have_dash_pthreads=no
     if test "$ac_cv_have_dash_pthread" = "no"; then
 	    echo $ac_n "checking whether ${CC-cc} accepts -pthreads""... $ac_c" 1>&6
-echo "configure:5458: checking whether ${CC-cc} accepts -pthreads" >&5
+echo "configure:5457: checking whether ${CC-cc} accepts -pthreads" >&5
     	echo 'int main() { return 0; }' | cat > conftest.c
 	    ${CC-cc} -pthreads -o conftest conftest.c > conftest.out 2>&1
     	if test $? -eq 0; then
 	    	if test -z "`egrep -i '(unrecognize|unknown)' conftest.out | grep pthreads`" && test -z "`egrep -i '(error|incorrect)' conftest.out`" ; then
 			    ac_cv_have_dash_pthreads=yes
 			    CFLAGS="$CFLAGS -pthreads"
 			    CXXFLAGS="$CXXFLAGS -pthreads"
 		    fi
--- a/configure.in
+++ b/configure.in
@@ -926,35 +926,34 @@ case "$target" in
     AC_DEFINE(XP_UNIX)
     AC_DEFINE(DARWIN)
     AC_DEFINE(HAVE_BSD_FLOCK)
     CFLAGS="$CFLAGS -Wmost -fno-common"
     case "${target_cpu}" in
         i*86*)
             AC_DEFINE(i386)
             CPU_ARCH=i386
+            PR_MD_ASFILES=os_Darwin_x86.s
             ;;
         *)
             AC_DEFINE(ppc)
             CPU_ARCH=ppc
+            PR_MD_ASFILES=os_Darwin_ppc.s
             ;;
     esac
     DSO_CFLAGS=-fPIC
     DSO_LDOPTS='-dynamiclib -compatibility_version 1 -current_version 1 -all_load -install_name @executable_path/$@ -headerpad_max_install_names'
     # Use the standard preprocessor (cpp)
     CFLAGS="$CFLAGS -no-cpp-precomp"
     MKSHLIB='$(CC) -arch $(CPU_ARCH) $(DSO_LDOPTS) -o $@'
     STRIP="$STRIP -x -S"
     DLL_SUFFIX=dylib
     USE_PTHREADS=1
     MDCPUCFG_H=_darwin.cfg
     PR_MD_CSRCS=darwin.c
-    if test "$CPU_ARCH" = "ppc"; then
-        PR_MD_ASFILES=os_Darwin_ppc.s
-    fi
 
     # Add Mac OS X support for loading CFM & CFBundle plugins
     if test -f /System/Library/Frameworks/Carbon.framework/Carbon; then
         AC_DEFINE(XP_MACOSX)
         OS_TARGET=MacOSX
 
         if test -n "$_MACOSX_DEPLOYMENT_TARGET" ; then
             dnl Use the specified value
--- a/pr/include/md/_darwin.h
+++ b/pr/include/md/_darwin.h
@@ -43,19 +43,19 @@
 #include <sys/syscall.h>
 
 #ifdef XP_MACOSX
 #include <AvailabilityMacros.h>
 #endif
 
 #define PR_LINKER_ARCH	"darwin"
 #define _PR_SI_SYSNAME  "DARWIN"
-#ifdef i386
+#ifdef __i386__
 #define _PR_SI_ARCHITECTURE "x86"
-#else
+#elif defined(__ppc__)
 #define _PR_SI_ARCHITECTURE "ppc"
 #endif
 #define PR_DLL_SUFFIX		".dylib"
 
 #define _PR_VMBASE              0x30000000
 #define _PR_STACK_VMBASE	0x50000000
 #define _MD_DEFAULT_STACK_SIZE	65536L
 #define _MD_MMAP_FLAGS          MAP_PRIVATE
@@ -108,17 +108,28 @@
 extern PRInt32 _PR_DarwinPPC_AtomicIncrement(PRInt32 *val);
 #define _MD_ATOMIC_INCREMENT(val)   _PR_DarwinPPC_AtomicIncrement(val)
 extern PRInt32 _PR_DarwinPPC_AtomicDecrement(PRInt32 *val);
 #define _MD_ATOMIC_DECREMENT(val)   _PR_DarwinPPC_AtomicDecrement(val)
 extern PRInt32 _PR_DarwinPPC_AtomicSet(PRInt32 *val, PRInt32 newval);
 #define _MD_ATOMIC_SET(val, newval) _PR_DarwinPPC_AtomicSet(val, newval)
 extern PRInt32 _PR_DarwinPPC_AtomicAdd(PRInt32 *ptr, PRInt32 val);
 #define _MD_ATOMIC_ADD(ptr, val)    _PR_DarwinPPC_AtomicAdd(ptr, val)
-#endif /* __ppc__ */
+#elif defined(__i386__)
+#define _PR_HAVE_ATOMIC_OPS
+#define _MD_INIT_ATOMIC()
+extern PRInt32 _PR_Darwin_x86_AtomicIncrement(PRInt32 *val);
+#define _MD_ATOMIC_INCREMENT(val)   _PR_Darwin_x86_AtomicIncrement(val)
+extern PRInt32 _PR_Darwin_x86_AtomicDecrement(PRInt32 *val);
+#define _MD_ATOMIC_DECREMENT(val)   _PR_Darwin_x86_AtomicDecrement(val)
+extern PRInt32 _PR_Darwin_x86_AtomicSet(PRInt32 *val, PRInt32 newval);
+#define _MD_ATOMIC_SET(val, newval) _PR_Darwin_x86_AtomicSet(val, newval)
+extern PRInt32 _PR_Darwin_x86_AtomicAdd(PRInt32 *ptr, PRInt32 val);
+#define _MD_ATOMIC_ADD(ptr, val)    _PR_Darwin_x86_AtomicAdd(ptr, val)
+#endif /* __i386__ */
 
 #define USE_SETJMP
 
 #if !defined(_PR_PTHREADS)
 
 #include <setjmp.h>
 
 #define PR_CONTEXT_TYPE	jmp_buf
new file mode 100644
--- /dev/null
+++ b/pr/src/md/unix/os_Darwin_x86.s
@@ -0,0 +1,105 @@
+# -*- 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