17c478bd9Sstevel@tonic-gate/* 27c478bd9Sstevel@tonic-gate * CDDL HEADER START 37c478bd9Sstevel@tonic-gate * 47c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 58cd45542Sraf * Common Development and Distribution License (the "License"). 68cd45542Sraf * You may not use this file except in compliance with the License. 77c478bd9Sstevel@tonic-gate * 87c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 97c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 107c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 117c478bd9Sstevel@tonic-gate * and limitations under the License. 127c478bd9Sstevel@tonic-gate * 137c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 147c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 157c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 167c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 177c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 187c478bd9Sstevel@tonic-gate * 197c478bd9Sstevel@tonic-gate * CDDL HEADER END 207c478bd9Sstevel@tonic-gate */ 218cd45542Sraf 227c478bd9Sstevel@tonic-gate/* 238cd45542Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 247c478bd9Sstevel@tonic-gate * Use is subject to license terms. 257c478bd9Sstevel@tonic-gate */ 267c478bd9Sstevel@tonic-gate 27*9a70fc3bSMark J. Nelson .file "memset.s" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h> 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(memset,function) 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate#include "SYS.h" 347c478bd9Sstevel@tonic-gate 357c478bd9Sstevel@tonic-gate ENTRY(memset) 367c478bd9Sstevel@tonic-gate pushl %edi / save register variable 377c478bd9Sstevel@tonic-gate movl 8(%esp),%edi / %edi = string address 387c478bd9Sstevel@tonic-gate movl 12(%esp),%eax / %al = byte to duplicate 397c478bd9Sstevel@tonic-gate movl 16(%esp),%ecx / %ecx = number of copies 407c478bd9Sstevel@tonic-gate cmpl $20,%ecx / strings with 20 or more chars should 417c478bd9Sstevel@tonic-gate jbe .byteset / byteset one word at a time 427c478bd9Sstevel@tonic-gate.wordset: 437c478bd9Sstevel@tonic-gate andl $0xff,%eax / Duplicate fill const 4 times in %eax 447c478bd9Sstevel@tonic-gate shrl $2,%ecx / %ecx = number of words to set 457c478bd9Sstevel@tonic-gate movl %eax,%edx 467c478bd9Sstevel@tonic-gate shll $8,%eax / This is ugly, but no P6 partial stalls 477c478bd9Sstevel@tonic-gate orl %edx,%eax / get introduced as before 487c478bd9Sstevel@tonic-gate shll $8,%eax 497c478bd9Sstevel@tonic-gate orl %edx,%eax 507c478bd9Sstevel@tonic-gate shll $8,%eax 517c478bd9Sstevel@tonic-gate orl %edx,%eax 527c478bd9Sstevel@tonic-gate rep; sstol 537c478bd9Sstevel@tonic-gate movl 16(%esp),%ecx 547c478bd9Sstevel@tonic-gate andl $3,%ecx / %ecx = number of bytes left 557c478bd9Sstevel@tonic-gate.byteset: 567c478bd9Sstevel@tonic-gate rep; sstob 577c478bd9Sstevel@tonic-gate movl 8(%esp),%eax / return string address 587c478bd9Sstevel@tonic-gate popl %edi / restore register variable 597c478bd9Sstevel@tonic-gate ret 607c478bd9Sstevel@tonic-gate SET_SIZE(memset) 61