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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .file "memset.s" 28 29#include <sys/asm_linkage.h> 30 31 ANSI_PRAGMA_WEAK(memset,function) 32 33#include "SYS.h" 34 35 ENTRY(memset) 36 pushl %edi / save register variable 37 movl 8(%esp),%edi / %edi = string address 38 movl 12(%esp),%eax / %al = byte to duplicate 39 movl 16(%esp),%ecx / %ecx = number of copies 40 cmpl $20,%ecx / strings with 20 or more chars should 41 jbe .byteset / byteset one word at a time 42.wordset: 43 andl $0xff,%eax / Duplicate fill const 4 times in %eax 44 shrl $2,%ecx / %ecx = number of words to set 45 movl %eax,%edx 46 shll $8,%eax / This is ugly, but no P6 partial stalls 47 orl %edx,%eax / get introduced as before 48 shll $8,%eax 49 orl %edx,%eax 50 shll $8,%eax 51 orl %edx,%eax 52 rep; sstol 53 movl 16(%esp),%ecx 54 andl $3,%ecx / %ecx = number of bytes left 55.byteset: 56 rep; sstob 57 movl 8(%esp),%eax / return string address 58 popl %edi / restore register variable 59 ret 60 SET_SIZE(memset) 61