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      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