/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
.file "memset.s"
#include <sys/asm_linkage.h>
ANSI_PRAGMA_WEAK(memset,function)
#include "SYS.h"
ENTRY(memset)
pushl %edi / save register variable
movl 8(%esp),%edi / %edi = string address
movl 12(%esp),%eax / %al = byte to duplicate
movl 16(%esp),%ecx / %ecx = number of copies
cmpl $20,%ecx / strings with 20 or more chars should
jbe .byteset / byteset one word at a time
.wordset:
andl $0xff,%eax / Duplicate fill const 4 times in %eax
shrl $2,%ecx / %ecx = number of words to set
movl %eax,%edx
shll $8,%eax / This is ugly, but no P6 partial stalls
orl %edx,%eax / get introduced as before
shll $8,%eax
orl %edx,%eax
shll $8,%eax
orl %edx,%eax
rep; sstol
movl 16(%esp),%ecx
andl $3,%ecx / %ecx = number of bytes left
.byteset:
rep; sstob
movl 8(%esp),%eax / return string address
popl %edi / restore register variable
ret
SET_SIZE(memset)