10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 56515Sraf * Common Development and Distribution License (the "License"). 66515Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 216515Sraf 220Sstevel@tonic-gate/* 236515Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "memset.s" 280Sstevel@tonic-gate 290Sstevel@tonic-gate#include <sys/asm_linkage.h> 300Sstevel@tonic-gate 310Sstevel@tonic-gate ANSI_PRAGMA_WEAK(memset,function) 320Sstevel@tonic-gate 330Sstevel@tonic-gate#include "SYS.h" 340Sstevel@tonic-gate 350Sstevel@tonic-gate ENTRY(memset) 360Sstevel@tonic-gate pushl %edi / save register variable 370Sstevel@tonic-gate movl 8(%esp),%edi / %edi = string address 380Sstevel@tonic-gate movl 12(%esp),%eax / %al = byte to duplicate 390Sstevel@tonic-gate movl 16(%esp),%ecx / %ecx = number of copies 400Sstevel@tonic-gate cmpl $20,%ecx / strings with 20 or more chars should 410Sstevel@tonic-gate jbe .byteset / byteset one word at a time 420Sstevel@tonic-gate.wordset: 430Sstevel@tonic-gate andl $0xff,%eax / Duplicate fill const 4 times in %eax 440Sstevel@tonic-gate shrl $2,%ecx / %ecx = number of words to set 450Sstevel@tonic-gate movl %eax,%edx 460Sstevel@tonic-gate shll $8,%eax / This is ugly, but no P6 partial stalls 470Sstevel@tonic-gate orl %edx,%eax / get introduced as before 480Sstevel@tonic-gate shll $8,%eax 490Sstevel@tonic-gate orl %edx,%eax 500Sstevel@tonic-gate shll $8,%eax 510Sstevel@tonic-gate orl %edx,%eax 520Sstevel@tonic-gate rep; sstol 530Sstevel@tonic-gate movl 16(%esp),%ecx 540Sstevel@tonic-gate andl $3,%ecx / %ecx = number of bytes left 550Sstevel@tonic-gate.byteset: 560Sstevel@tonic-gate rep; sstob 570Sstevel@tonic-gate movl 8(%esp),%eax / return string address 580Sstevel@tonic-gate popl %edi / restore register variable 590Sstevel@tonic-gate ret 600Sstevel@tonic-gate SET_SIZE(memset) 61