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