strchr.S revision 1.2
1 1.2 dsl /* $NetBSD: strchr.S,v 1.2 2009/07/17 19:37:57 dsl Exp $ */ 2 1.1 christos 3 1.2 dsl /*- 4 1.2 dsl * Copyright (c) 1990 The Regents of the University of California. 5 1.2 dsl * All rights reserved. 6 1.2 dsl * 7 1.2 dsl * This code is derived from software contributed to Berkeley by 8 1.2 dsl * the Systems Programming Group of the University of Utah Computer 9 1.2 dsl * Science Department. 10 1.2 dsl * 11 1.2 dsl * Redistribution and use in source and binary forms, with or without 12 1.2 dsl * modification, are permitted provided that the following conditions 13 1.2 dsl * are met: 14 1.2 dsl * 1. Redistributions of source code must retain the above copyright 15 1.2 dsl * notice, this list of conditions and the following disclaimer. 16 1.2 dsl * 2. Redistributions in binary form must reproduce the above copyright 17 1.2 dsl * notice, this list of conditions and the following disclaimer in the 18 1.2 dsl * documentation and/or other materials provided with the distribution. 19 1.2 dsl * 3. Neither the name of the University nor the names of its contributors 20 1.2 dsl * may be used to endorse or promote products derived from this software 21 1.2 dsl * without specific prior written permission. 22 1.2 dsl * 23 1.2 dsl * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 1.2 dsl * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 1.2 dsl * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 1.2 dsl * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 1.2 dsl * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 1.2 dsl * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 1.2 dsl * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 1.2 dsl * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 1.2 dsl * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 1.2 dsl * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 1.2 dsl * SUCH DAMAGE. 34 1.2 dsl */ 35 1.2 dsl 36 1.2 dsl #include <machine/asm.h> 37 1.2 dsl 38 1.2 dsl #if defined(LIBC_SCCS) && !defined(lint) 39 1.2 dsl #if 0 40 1.2 dsl RCSID("from: @(#)index.s 5.1 (Berkeley) 5/12/90") 41 1.2 dsl #else 42 1.2 dsl RCSID("$NetBSD: strchr.S,v 1.2 2009/07/17 19:37:57 dsl Exp $") 43 1.2 dsl #endif 44 1.2 dsl #endif /* LIBC_SCCS and not lint */ 45 1.2 dsl 46 1.2 dsl ENTRY(strchr) 47 1.2 dsl movl %sp@(4),%a0 | string 48 1.2 dsl movb %sp@(11),%d0 | char to look for 49 1.2 dsl ixloop: 50 1.2 dsl cmpb %a0@,%d0 | found our char? 51 1.2 dsl jeq ixfound | yes, break out 52 1.2 dsl tstb %a0@+ | null? 53 1.2 dsl jne ixloop | no, keep going 54 1.2 dsl moveq #0,%d0 | not found, return null 55 1.2 dsl #ifdef __SVR4_ABI__ 56 1.2 dsl moveal %d0,%a0 57 1.2 dsl #endif 58 1.2 dsl rts 59 1.2 dsl ixfound: 60 1.2 dsl movl %a0,%d0 | found, return pointer 61 1.2 dsl rts 62 1.2 dsl 63 1.2 dsl STRONG_ALIAS(index,strchr) 64
Indexes created Tue Sep 23 22:09:46 GMT 2025