strchr.S revision 1.1
11.1Sjoerg/* $NetBSD: strchr.S,v 1.1 2011/06/16 16:39:14 joerg Exp $ */ 21.1Sjoerg/*- 31.1Sjoerg * Copyright (c) 2011 The NetBSD Foundation, Inc. 41.1Sjoerg * All rights reserved. 51.1Sjoerg * 61.1Sjoerg * This code is derived from software contributed to The NetBSD Foundation 71.1Sjoerg * by Joerg Sonnenberger. 81.1Sjoerg * 91.1Sjoerg * Redistribution and use in source and binary forms, with or without 101.1Sjoerg * modification, are permitted provided that the following conditions 111.1Sjoerg * are met: 121.1Sjoerg * 1. Redistributions of source code must retain the above copyright 131.1Sjoerg * notice, this list of conditions and the following disclaimer. 141.1Sjoerg * 2. Redistributions in binary form must reproduce the above copyright 151.1Sjoerg * notice, this list of conditions and the following disclaimer in the 161.1Sjoerg * documentation and/or other materials provided with the distribution. 171.1Sjoerg * 181.1Sjoerg * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 191.1Sjoerg * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 201.1Sjoerg * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 211.1Sjoerg * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 221.1Sjoerg * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 231.1Sjoerg * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 241.1Sjoerg * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 251.1Sjoerg * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 261.1Sjoerg * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 271.1Sjoerg * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 281.1Sjoerg * POSSIBILITY OF SUCH DAMAGE. 291.1Sjoerg */ 301.1Sjoerg 311.1Sjoerg#include <machine/asm.h> 321.1Sjoerg RCSID("$NetBSD: strchr.S,v 1.1 2011/06/16 16:39:14 joerg Exp $") 331.1Sjoerg 341.1SjoergENTRY(strchr) 351.1Sjoerg popl %edx /* Return address */ 361.1Sjoerg popl %eax /* String pointer */ 371.1Sjoerg popl %ecx /* Character to find */ 381.1Sjoerg pushl %ecx 391.1Sjoerg pushl %eax 401.1Sjoerg pushl %edx 411.1Sjoerg1: 421.1Sjoerg cmpb $0, 0(%eax) 431.1Sjoerg je 2f 441.1Sjoerg cmpb %cl, 0(%eax) 451.1Sjoerg je 3f 461.1Sjoerg incl %eax 471.1Sjoerg jmp 1b 481.1Sjoerg2: 491.1Sjoerg xorl %eax, %eax 501.1Sjoerg3: 511.1Sjoerg ret 52