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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .ident "%Z%%M% %I% %E% SMI" 28 29 .file "%M%" 30 31#include <sys/asm_linkage.h> 32 33 ANSI_PRAGMA_WEAK(memccpy,function) 34 35#include "SYS.h" 36 37 ENTRY(memccpy) /* (void *dst, void *src, uchar_t c, size_t) */ 38.loop: 39 decq %rcx / decrement bytes to go 40 jl .notfound 41 movb (%rsi),%dh 42 movb %dh,(%rdi) / move byte 43 cmpb %dh,%dl / is it the byte sought? 44 je .found / yes 45 46 decq %rcx / decrement bytes to go 47 jl .notfound 48 movb 1(%rsi),%dh 49 movb %dh,1(%rdi) / move byte 50 cmpb %dh,%dl / is it the byte sought? 51 je .found1 / yes 52 53 decq %rcx / decrement bytes to go 54 jl .notfound 55 movb 2(%rsi),%dh 56 movb %dh,2(%rdi) / move byte 57 cmpb %dh,%dl / is it the byte sought? 58 je .found2 / yes 59 60 decq %rcx / decrement bytes to go 61 jl .notfound 62 movb 3(%rsi),%dh 63 movb %dh,3(%rdi) / move byte 64 addq $4,%rsi 65 addq $4,%rdi 66 cmpb %dh,%dl / is it the byte sought? 67 jne .loop / no 68 decq %rdi 69 70.found: 71 incq %rdi / return pointer to next byte in dest 72 movq %rdi,%rax 73 ret 74 75 .align 4 76.found2: 77 incq %rdi 78.found1: 79 addq $2,%rdi / return pointer to next byte in dest 80 movq %rdi,%rax 81 ret 82 83 .align 4 84.notfound: 85 xorl %eax,%eax / search fails 86 ret 87 SET_SIZE(memccpy) 88