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.h" 32 33 ENTRY(strchr) /* (char *, char) */ 34.loop: 35 movb (%rdi),%dl / %dl = byte of string 36 cmpb %sil,%dl / find it? 37 je .found / yes 38 testb %dl,%dl / is it null? 39 je .notfound 40 41 movb 1(%rdi),%dl / %dl = byte of string 42 cmpb %sil,%dl / find it? 43 je .found1 / yes 44 testb %dl,%dl / is it null? 45 je .notfound 46 47 movb 2(%rdi),%dl / %dl = byte of string 48 cmpb %sil,%dl / find it? 49 je .found2 / yes 50 testb %dl,%dl / is it null? 51 je .notfound 52 53 movb 3(%rdi),%dl / %dl = byte of string 54 cmpb %sil,%dl / find it? 55 je .found3 / yes 56 addq $4,%rdi 57 testb %dl,%dl / is it null? 58 jne .loop 59 60.notfound: 61 xorl %eax,%eax / %rax = NULL 62 ret 63 64.found3: 65 incq %rdi 66.found2: 67 incq %rdi 68.found1: 69 incq %rdi 70.found: 71 movq %rdi,%rax 72 ret 73 SET_SIZE(strchr) 74