1*d719c1c9Smatt/*- 2*d719c1c9Smatt * Copyright (c) 2013 The NetBSD Foundation, Inc. 3*d719c1c9Smatt * All rights reserved. 4*d719c1c9Smatt * 5*d719c1c9Smatt * This code is derived from software contributed to The NetBSD Foundation 6*d719c1c9Smatt * by Matt Thomas of 3am Software Foundry. 7*d719c1c9Smatt * 8*d719c1c9Smatt * Redistribution and use in source and binary forms, with or without 9*d719c1c9Smatt * modification, are permitted provided that the following conditions 10*d719c1c9Smatt * are met: 11*d719c1c9Smatt * 1. Redistributions of source code must retain the above copyright 12*d719c1c9Smatt * notice, this list of conditions and the following disclaimer. 13*d719c1c9Smatt * 2. Redistributions in binary form must reproduce the above copyright 14*d719c1c9Smatt * notice, this list of conditions and the following disclaimer in the 15*d719c1c9Smatt * documentation and/or other materials provided with the distribution. 16*d719c1c9Smatt * 17*d719c1c9Smatt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18*d719c1c9Smatt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19*d719c1c9Smatt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20*d719c1c9Smatt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21*d719c1c9Smatt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22*d719c1c9Smatt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23*d719c1c9Smatt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24*d719c1c9Smatt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25*d719c1c9Smatt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26*d719c1c9Smatt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27*d719c1c9Smatt * POSSIBILITY OF SUCH DAMAGE. 28*d719c1c9Smatt */ 29*d719c1c9Smatt#include <machine/asm.h> 30*d719c1c9Smatt 31*d719c1c9SmattRCSID("$NetBSD: strrchr_naive.S,v 1.1 2013/01/15 02:03:30 matt Exp $") 32*d719c1c9Smatt 33*d719c1c9Smatt/* LINTSTUB: char * strrchr(const char *, int) */ 34*d719c1c9SmattENTRY(strrchr) 35*d719c1c9Smatt mov ip, r0 /* using r0 as return value */ 36*d719c1c9Smatt mov r0, #0 /* default to no match */ 37*d719c1c9Smatt and r1, r1, #0xff /* restrict to a byte value */ 38*d719c1c9Smatt1: ldrb r3, [ip], #1 /* read a byte */ 39*d719c1c9Smatt cmp r3, r1 /* does it match? */ 40*d719c1c9Smatt subeq r0, ip, #1 /* yes, set return value to point to it */ 41*d719c1c9Smatt teq r3, #0 /* was it a NUL? */ 42*d719c1c9Smatt bne 1b /* no, get next byte */ 43*d719c1c9Smatt RET 44*d719c1c9SmattEND(strrchr) 45