--- Libc/Libc-320/pthreads/stack.s
+++ Libc/Libc-594.9.1/pthreads/stack.s
@@ -2,8 +2,6 @@
  * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
@@ -49,7 +47,7 @@
 
 .text
 
-#if defined(__ppc__)
+#if defined(__ppc__) || defined(__ppc64__)
 #import	<architecture/ppc/asm_help.h>
 #import	<architecture/ppc/pseudo_inst.h>
 
@@ -87,6 +85,40 @@
 	subl	$0x100,%eax
 	ret
 
+#elif defined(__x86_64__)
+
+#import	<architecture/i386/asm_help.h>
+/*	
+ * void *_sp(void)
+ */
+
+LEAF(__sp,0)
+	movq	%rsp,%rax
+	ret
+
+/*
+ * void *_adjust_sp(void *sp)
+ */
+LEAF(__adjust_sp,0)
+	movq	%rdi,%rax
+	subq	$0x100,%rax
+	ret
+
+#elif defined(__arm__)
+
+#import	<architecture/arm/asm_help.h>
+
+LEAF(__sp,0)
+	mov	r0,sp
+	bx	lr
+
+/*
+ * void *_adjust_sp(void *sp)
+ */
+LEAF(__adjust_sp,0)
+	sub	r0, r0, #0x100
+	bx	lr
+
 #else
 #error sp functions not defined for this architecture
 #endif