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 5*9a70fc3bSMark J. Nelson * Common Development and Distribution License (the "License"). 6*9a70fc3bSMark J. Nelson * 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 */ 217c478bd9Sstevel@tonic-gate/* 227c478bd9Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 237c478bd9Sstevel@tonic-gate * Use is subject to license terms. 247c478bd9Sstevel@tonic-gate */ 257c478bd9Sstevel@tonic-gate 26*9a70fc3bSMark J. Nelson .file "memccpy.s" 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h> 297c478bd9Sstevel@tonic-gate 307c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(memccpy,function) 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate#include "SYS.h" 337c478bd9Sstevel@tonic-gate 347c478bd9Sstevel@tonic-gate ENTRY(memccpy) 357c478bd9Sstevel@tonic-gate pushl %esi / save register variable 367c478bd9Sstevel@tonic-gate movl 8(%esp),%eax / %eax = address of dest string 377c478bd9Sstevel@tonic-gate movl 12(%esp),%esi / %esi = address of source string 387c478bd9Sstevel@tonic-gate movb 16(%esp),%dh / %dh = character to search for 397c478bd9Sstevel@tonic-gate movl 20(%esp),%ecx / %ecx = length to go still 407c478bd9Sstevel@tonic-gate.loop: 417c478bd9Sstevel@tonic-gate decl %ecx / decrement bytes to go 427c478bd9Sstevel@tonic-gate jl .notfound 437c478bd9Sstevel@tonic-gate movb (%esi),%dl 447c478bd9Sstevel@tonic-gate movb %dl,(%eax) / move byte 457c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 467c478bd9Sstevel@tonic-gate je .found / yes 477c478bd9Sstevel@tonic-gate 487c478bd9Sstevel@tonic-gate decl %ecx / decrement bytes to go 497c478bd9Sstevel@tonic-gate jl .notfound 507c478bd9Sstevel@tonic-gate movb 1(%esi),%dl 517c478bd9Sstevel@tonic-gate movb %dl,1(%eax) / move byte 527c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 537c478bd9Sstevel@tonic-gate je .found1 / yes 547c478bd9Sstevel@tonic-gate 557c478bd9Sstevel@tonic-gate decl %ecx / decrement bytes to go 567c478bd9Sstevel@tonic-gate jl .notfound 577c478bd9Sstevel@tonic-gate movb 2(%esi),%dl 587c478bd9Sstevel@tonic-gate movb %dl,2(%eax) / move byte 597c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 607c478bd9Sstevel@tonic-gate je .found2 / yes 617c478bd9Sstevel@tonic-gate 627c478bd9Sstevel@tonic-gate decl %ecx / decrement bytes to go 637c478bd9Sstevel@tonic-gate jl .notfound 647c478bd9Sstevel@tonic-gate movb 3(%esi),%dl 657c478bd9Sstevel@tonic-gate movb %dl,3(%eax) / move byte 667c478bd9Sstevel@tonic-gate addl $4,%esi 677c478bd9Sstevel@tonic-gate addl $4,%eax 687c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 697c478bd9Sstevel@tonic-gate jne .loop / no 707c478bd9Sstevel@tonic-gate decl %eax 717c478bd9Sstevel@tonic-gate 727c478bd9Sstevel@tonic-gate.found: 737c478bd9Sstevel@tonic-gate popl %esi / restore register variable 747c478bd9Sstevel@tonic-gate incl %eax / return pointer to next byte in dest 757c478bd9Sstevel@tonic-gate ret 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate .align 4 787c478bd9Sstevel@tonic-gate.found2: 797c478bd9Sstevel@tonic-gate incl %eax 807c478bd9Sstevel@tonic-gate.found1: 817c478bd9Sstevel@tonic-gate popl %esi / restore register variable 827c478bd9Sstevel@tonic-gate addl $2,%eax / return pointer to next byte in dest 837c478bd9Sstevel@tonic-gate ret 847c478bd9Sstevel@tonic-gate 857c478bd9Sstevel@tonic-gate .align 4 867c478bd9Sstevel@tonic-gate.notfound: 877c478bd9Sstevel@tonic-gate popl %esi / restore register variable 887c478bd9Sstevel@tonic-gate xorl %eax,%eax / search fails 897c478bd9Sstevel@tonic-gate ret 907c478bd9Sstevel@tonic-gate SET_SIZE(memccpy) 91