xnu-1228.tar.gz

[apple/xnu.git] / osfmk / i386 / commpage / bzero_scalar.s

diff --git a/osfmk/i386/commpage/bzero_scalar.s b/osfmk/i386/commpage/bzero_scalar.s
index c058e407b27859a9e7f4947c9e15c6fdb9d19d8e..7839413d7f823a80c2d493e03589174c27f72eaf 100644 (file)
--- a/osfmk/i386/commpage/bzero_scalar.s
+++ b/osfmk/i386/commpage/bzero_scalar.s
@@ -1,14 +1,19 @@
 /*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
@@ -18,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * Copyright (c) 1993 Winning Strategies, Inc.
@@ -66,10 +71,12 @@
 .text
 .align 5, 0x90
 Lbzero_scalar:
+       pushl   %ebp                    /* set up a frame for backtraces */
+       movl    %esp,%ebp
         pushl   %edi
         pushl   %ebx
-        movl    12(%esp),%edi
-        movl    16(%esp),%ecx
+        movl    8(%ebp),%edi
+        movl    12(%ebp),%ecx
 
         cld                             /* set fill direction forward */
         xorl    %eax,%eax               /* set fill data to 0 */
@@ -80,7 +87,7 @@ Lbzero_scalar:
          * unaligned set.
          */
         cmpl    $0x0f,%ecx
-        jle     L1
+        jbe     L1
 
         movl    %edi,%edx               /* compute misalignment */
         negl    %edx
@@ -104,6 +111,7 @@ L1:     rep
 
         popl    %ebx
         popl    %edi
+       popl    %ebp
        ret
 
-       COMMPAGE_DESCRIPTOR(bzero_scalar,_COMM_PAGE_BZERO,0,0)
+       COMMPAGE_DESCRIPTOR(bzero_scalar,_COMM_PAGE_BZERO,0,kHasSSE2)