strlen.S revision 209231 
1219019Sgabor/*	$NetBSD: strlen.S,v 1.2 2009/12/14 00:39:00 matt Exp $	*/
2219019Sgabor
3219019Sgabor/*-
4219019Sgabor * Copyright (c) 1991, 1993
5219019Sgabor *	The Regents of the University of California.  All rights reserved.
6219019Sgabor *
7219019Sgabor * This code is derived from software contributed to Berkeley by
8219019Sgabor * Ralph Campbell.
9219019Sgabor *
10219019Sgabor * Redistribution and use in source and binary forms, with or without
11219019Sgabor * modification, are permitted provided that the following conditions
12219019Sgabor * are met:
13219019Sgabor * 1. Redistributions of source code must retain the above copyright
14219019Sgabor *    notice, this list of conditions and the following disclaimer.
15219019Sgabor * 2. Redistributions in binary form must reproduce the above copyright
16219019Sgabor *    notice, this list of conditions and the following disclaimer in the
17219019Sgabor *    documentation and/or other materials provided with the distribution.
18258293Shrs * 3. Neither the name of the University nor the names of its contributors
19258293Shrs *    may be used to endorse or promote products derived from this software
20219019Sgabor *    without specific prior written permission.
21219019Sgabor *
22258293Shrs * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23258293Shrs * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24219019Sgabor * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25219019Sgabor * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26219019Sgabor * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27219019Sgabor * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28219019Sgabor * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29219019Sgabor * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30219019Sgabor * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31219019Sgabor * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32219019Sgabor * SUCH DAMAGE.
33219019Sgabor */
34219019Sgabor
35219019Sgabor#include <machine/asm.h>
36219019Sgabor__FBSDID("$FreeBSD: head/lib/libc/mips/string/strlen.S 209231 2010-06-16 12:55:14Z jchandra $");
37219019Sgabor
38219019Sgabor#if defined(LIBC_SCCS) && !defined(lint)
39258293Shrs	ASMSTR("from: @(#)strlen.s	8.1 (Berkeley) 6/4/93")
40258293Shrs	ASMSTR("$NetBSD: strlen.S,v 1.2 2009/12/14 00:39:00 matt Exp $")
41219019Sgabor#endif /* LIBC_SCCS and not lint */
42219019Sgabor
43258293Shrs#ifdef __ABICALLS__
44258293Shrs	.abicalls
45219019Sgabor#endif
46
47LEAF(strlen)
48	PTR_ADDU	v1, a0, 1
491:
50	lb		v0, 0(a0)	# get byte from string
51	PTR_ADDU	a0, a0, 1	# increment pointer
52	bne		v0, zero, 1b	# continue if not end
53	PTR_SUBU 	v0, a0, v1	# compute length - 1 for '\0' char
54	j		ra
55END(strlen)
56