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 (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22/* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 .file "wschr.s" 28 29/ 30/ Wide character wcschr() implementation 31/ 32/ Algorithm based on Solaris 2.6 gen/strchr.s implementation 33/ 34 35#include <sys/asm_linkage.h> 36 37 ANSI_PRAGMA_WEAK(wcschr,function) 38 ANSI_PRAGMA_WEAK(wschr,function) 39 40 .align 8 / accounts for .loop alignment and prolog 41 42 ENTRY(wcschr) /* (wchar_t *s, wchar_t wc) */ 43 movq %rdi,%rax 44.loop: 45 movl (%rax),%edx / %edx = wchar of string 46 cmpl %esi,%edx / find it? 47 je .found / yes 48 testl %edx,%edx / is it null? 49 je .notfound 50 51 movl 4(%rax),%edx / %edx = wchar of string 52 cmpl %esi,%edx / find it? 53 je .found1 / yes 54 testl %edx,%edx / is it null? 55 je .notfound 56 57 movl 8(%rax),%edx / %edx = wchar of string 58 cmpl %esi,%edx / find it? 59 je .found2 / yes 60 testl %edx,%edx / is it null? 61 je .notfound 62 63 movl 12(%rax),%edx / %edx = wchar of string 64 cmpl %esi,%edx / find it? 65 je .found3 / yes 66 addq $16,%rax 67 testl %edx,%edx / is it null? 68 jne .loop 69 70.notfound: 71 xorl %eax,%eax / %rax = NULL 72 ret 73 74.found3: 75 addq $12,%rax 76 ret 77.found2: 78 addq $8,%rax 79 ret 80.found1: 81 addq $4,%rax 82.found: 83 ret 84 SET_SIZE(wcschr) 85 86 ENTRY(wschr) 87 jmp wcschr / tail call into wcschr 88 SET_SIZE(wschr) 89