1/* $NetBSD: bcmp.S,v 1.6 2013/09/07 19:06:29 chs Exp $ */ 2 3/*- 4 * Copyright (c) 1997 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by J.T. Conklin. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32/*- 33 * Copyright (c) 1990 The Regents of the University of California. 34 * All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * the Systems Programming Group of the University of Utah Computer 38 * Science Department. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65#include <machine/asm.h> 66 67#if defined(LIBC_SCCS) && !defined(lint) 68#if 0 69 RCSID("from: @(#)bcmp.s 5.1 (Berkeley) 5/12/90") 70#else 71 RCSID("$NetBSD: bcmp.S,v 1.6 2013/09/07 19:06:29 chs Exp $") 72#endif 73#endif /* LIBC_SCCS and not lint */ 74 75#ifdef __mcoldfire__ 76#define CMPMB(a,b) movb b,%d2; cmpb a,%d2 77#define CMPMW(a,b) movw b,%d2; cmpw a,%d2 78#define CMPML(a,b) movl b,%d2; cmpl a,%d2 79#else 80#define CMPMB(a,b) cmpmb a,b 81#define CMPMW(a,b) cmpmw a,b 82#define CMPML(a,b) cmpml a,b 83#endif 84 85ENTRY(bcmp) 86 movl 4(%sp),%a0 | string 1 87 movl 8(%sp),%a1 | string 2 88 movl 12(%sp),%d1 | length 89#ifdef __mcoldfire__ 90 movl %d2,-(%sp) | save temp 91#endif 92 93 /* 94 * It isn't worth the overhead of aligning to {long}word boundries 95 * if the string is too short. 96 */ 97 cmpl #8,%d1 98 jlt .Lbcbyte 99 100#ifdef __mc68010__ 101 /* 102 * The 68010 cannot access a word or long on an odd boundary, 103 * period. If the source and the destination addresses aren't 104 * of the same evenness, we're forced to do a bytewise compare. 105 */ 106 movl %a0,%d0 107 addl %a1,%d0 108 btst #0,%d0 109 jne .Lbcbyte 110#endif /* __mc68010__ */ 111 112 /* word align */ 113 movl %a0,%d0 114 btst #0,%d0 115 jeq .Lbcalgndw 116 CMPMB((%a0)+,(%a1)+) 117 jne .Lbcnoteq 118 subql #1,%d1 119.Lbcalgndw: 120 /* long word align */ 121 btst #1,%d0 122 jeq .Lbcalgndl 123 CMPMW((%a0)+,(%a1)+) 124 jne .Lbcnoteq 125 subql #2,%d1 126.Lbcalgndl: 127 /* compare by 8 longwords */ 128 movl %d1,%d0 129 lsrl #5,%d0 | cnt = len / 32 130 jeq .Lbclong | if (cnt) 131 andl #31,%d1 | len %= 32 132 subql #1,%d0 | set up for dbf 133.Lbc32loop: 134 CMPML((%a0)+,(%a1)+) | compare 1 of 8 longwords 135 jne .Lbcnoteq | not equal, return non-zero 136 CMPML((%a0)+,(%a1)+) | compare 2 of 8 longwords 137 jne .Lbcnoteq 138 CMPML((%a0)+,(%a1)+) | compare 3 of 8 longwords 139 jne .Lbcnoteq 140 CMPML((%a0)+,(%a1)+) | compare 4 of 8 longwords 141 jne .Lbcnoteq 142 CMPML((%a0)+,(%a1)+) | compare 5 of 8 longwords 143 jne .Lbcnoteq 144 CMPML((%a0)+,(%a1)+) | compare 6 of 8 longwords 145 jne .Lbcnoteq 146 CMPML((%a0)+,(%a1)+) | compare 7 of 8 longwords 147 jne .Lbcnoteq 148 CMPML((%a0)+,(%a1)+) | compare 8 of 8 longwords 149 jne .Lbcnoteq 150#ifndef __mcoldfire__ 151 dbf %d0,.Lbc32loop | till done 152 clrw %d0 153#endif 154 subql #1,%d0 155 jcc .Lbc32loop 156 157.Lbclong: 158 /* compare by longwords */ 159 movl %d1,%d0 160 lsrl #2,%d0 | cnt = len / 4 161 jeq .Lbcbyte | if (cnt) 162 subql #1,%d0 | set up for dbf 163.Lbclloop: 164 CMPML((%a0)+,(%a1)+) | compare a longword 165 jne .Lbcnoteq | not equal, return non-zero 166#ifdef __mcoldfire__ 167 subql #1,%d0 | decrement 168 jcc .Lbclloop | till done 169#else 170 dbf %d0,.Lbclloop | till done 171#endif 172 andl #3,%d1 | len %= 4 173 jeq .Lbcdone 174 175 subql #1,%d1 | set up for dbf 176.Lbcbloop: 177 CMPMB((%a0)+,(%a1)+) | compare a byte 178 jne .Lbcnoteq | not equal, return non-zero 179.Lbcbyte: 180#ifdef __mcoldfire__ 181 subql #1,%d0 | decrement 182 jcc .Lbcbloop | till done 183#else 184 dbf %d1,.Lbcbloop 185#endif 186.Lbcdone: 187#ifdef __mcoldfire__ 188 movl (%sp)+,%d2 | restore temp 189#endif 190 movql #0,%d0 191 rts 192 193.Lbcnoteq: 194 movql #1,%d0 195 rts 196END(bcmp) 197