1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31#include <sys/asm_linkage.h> 32 33 ANSI_PRAGMA_WEAK(memset,function) 34 35#include "SYS.h" 36 37 ANSI_PRAGMA_WEAK2(_private_memset,memset,function) 38 39 ENTRY(memset) 40 pushl %edi / save register variable 41 movl 8(%esp),%edi / %edi = string address 42 movl 12(%esp),%eax / %al = byte to duplicate 43 movl 16(%esp),%ecx / %ecx = number of copies 44 cmpl $20,%ecx / strings with 20 or more chars should 45 jbe .byteset / byteset one word at a time 46.wordset: 47 andl $0xff,%eax / Duplicate fill const 4 times in %eax 48 shrl $2,%ecx / %ecx = number of words to set 49 movl %eax,%edx 50 shll $8,%eax / This is ugly, but no P6 partial stalls 51 orl %edx,%eax / get introduced as before 52 shll $8,%eax 53 orl %edx,%eax 54 shll $8,%eax 55 orl %edx,%eax 56 rep; sstol 57 movl 16(%esp),%ecx 58 andl $3,%ecx / %ecx = number of bytes left 59.byteset: 60 rep; sstob 61 movl 8(%esp),%eax / return string address 62 popl %edi / restore register variable 63 ret 64 SET_SIZE(memset) 65