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 57257d1b4Sraf * Common Development and Distribution License (the "License"). 67257d1b4Sraf * 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 */ 217257d1b4Sraf 227c478bd9Sstevel@tonic-gate/* 237257d1b4Sraf * 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 "memccpy.s" 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate#include <sys/asm_linkage.h> 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate ANSI_PRAGMA_WEAK(memccpy,function) 327c478bd9Sstevel@tonic-gate 337c478bd9Sstevel@tonic-gate ENTRY(memccpy) /* (void *dst, void *src, uchar_t c, size_t) */ 347c478bd9Sstevel@tonic-gate.loop: 357c478bd9Sstevel@tonic-gate decq %rcx / decrement bytes to go 367c478bd9Sstevel@tonic-gate jl .notfound 377c478bd9Sstevel@tonic-gate movb (%rsi),%dh 387c478bd9Sstevel@tonic-gate movb %dh,(%rdi) / move byte 397c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 407c478bd9Sstevel@tonic-gate je .found / yes 417c478bd9Sstevel@tonic-gate 427c478bd9Sstevel@tonic-gate decq %rcx / decrement bytes to go 437c478bd9Sstevel@tonic-gate jl .notfound 447c478bd9Sstevel@tonic-gate movb 1(%rsi),%dh 457c478bd9Sstevel@tonic-gate movb %dh,1(%rdi) / move byte 467c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 477c478bd9Sstevel@tonic-gate je .found1 / yes 487c478bd9Sstevel@tonic-gate 497c478bd9Sstevel@tonic-gate decq %rcx / decrement bytes to go 507c478bd9Sstevel@tonic-gate jl .notfound 517c478bd9Sstevel@tonic-gate movb 2(%rsi),%dh 527c478bd9Sstevel@tonic-gate movb %dh,2(%rdi) / move byte 537c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 547c478bd9Sstevel@tonic-gate je .found2 / yes 557c478bd9Sstevel@tonic-gate 567c478bd9Sstevel@tonic-gate decq %rcx / decrement bytes to go 577c478bd9Sstevel@tonic-gate jl .notfound 587c478bd9Sstevel@tonic-gate movb 3(%rsi),%dh 597c478bd9Sstevel@tonic-gate movb %dh,3(%rdi) / move byte 607c478bd9Sstevel@tonic-gate addq $4,%rsi 617c478bd9Sstevel@tonic-gate addq $4,%rdi 627c478bd9Sstevel@tonic-gate cmpb %dh,%dl / is it the byte sought? 637c478bd9Sstevel@tonic-gate jne .loop / no 647c478bd9Sstevel@tonic-gate decq %rdi 657c478bd9Sstevel@tonic-gate 667c478bd9Sstevel@tonic-gate.found: 677c478bd9Sstevel@tonic-gate incq %rdi / return pointer to next byte in dest 687c478bd9Sstevel@tonic-gate movq %rdi,%rax 697c478bd9Sstevel@tonic-gate ret 707c478bd9Sstevel@tonic-gate 717c478bd9Sstevel@tonic-gate .align 4 727c478bd9Sstevel@tonic-gate.found2: 737c478bd9Sstevel@tonic-gate incq %rdi 747c478bd9Sstevel@tonic-gate.found1: 757c478bd9Sstevel@tonic-gate addq $2,%rdi / return pointer to next byte in dest 767c478bd9Sstevel@tonic-gate movq %rdi,%rax 777c478bd9Sstevel@tonic-gate ret 787c478bd9Sstevel@tonic-gate 797c478bd9Sstevel@tonic-gate .align 4 807c478bd9Sstevel@tonic-gate.notfound: 817c478bd9Sstevel@tonic-gate xorl %eax,%eax / search fails 827c478bd9Sstevel@tonic-gate ret 837c478bd9Sstevel@tonic-gate SET_SIZE(memccpy) 84