1 /* $NetBSD: bcopy.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: @(#)bcopy.s 5.1 (Berkeley) 5/12/90") 70 #else 71 RCSID("$NetBSD: bcopy.S,v 1.6 2013/09/07 19:06:29 chs Exp $") 72 #endif 73 #endif /* LIBC_SCCS and not lint */ 74 75 76 #ifdef MEMCOPY 77 #define XCOPY memcpy 78 #elif defined(MEMMOVE) 79 #define XCOPY memmove 80 #else 81 #define XCOPY bcopy 82 #endif 83 84 ENTRY(XCOPY) 85 #if defined(MEMCOPY) || defined(MEMMOVE) 86 movl 4(%sp),%a1 | dest address 87 movl 8(%sp),%a0 | src address 88 #else 89 movl 4(%sp),%a0 | src address 90 movl 8(%sp),%a1 | dest address 91 #endif 92 movl 12(%sp),%d1 | count 93 94 cmpl %a1,%a0 | src after dest? 95 jlt .Lbcback | yes, must copy backwards 96 97 /* 98 * It isn't worth the overhead of aligning to {long}word boundries 99 * if the string is too short. 100 */ 101 cmpl #8,%d1 102 jlt .Lbcfbyte 103 104 #ifdef __mc68010__ 105 /* 106 * The 68010 cannot access a word or long on an odd boundary, 107 * period. If the source and the destination addresses aren't 108 * of the same evenness, we're forced to do a bytewise copy. 109 */ 110 movl %a0,%d0 111 addl %a1,%d0 112 btst #0,%d0 113 jne .Lbcfbyte 114 #endif /* __mc68010__ */ 115 116 /* word align */ 117 movl %a1,%d0 118 btst #0,%d0 | if (dst & 1) 119 jeq .Lbcfalgndw | 120 movb (%a0)+,(%a1)+ | *(char *)dst++ = *(char *) src++ 121 subql #1,%d1 | len-- 122 .Lbcfalgndw: 123 /* long word align */ 124 btst #1,%d0 | if (dst & 2) 125 jeq .Lbcfalgndl 126 movw (%a0)+,(%a1)+ | *(short *)dst++ = *(short *) dst++ 127 subql #2,%d1 | len -= 2 128 .Lbcfalgndl: 129 /* copy by 8 longwords */ 130 movel %d1,%d0 131 lsrl #5,%d0 | cnt = len / 32 132 jeq .Lbcflong | if (cnt) 133 andl #31,%d1 | len %= 32 134 subql #1,%d0 | set up for dbf 135 .Lbcf32loop: 136 movl (%a0)+,(%a1)+ | copy 8 long words 137 movl (%a0)+,(%a1)+ 138 movl (%a0)+,(%a1)+ 139 movl (%a0)+,(%a1)+ 140 movl (%a0)+,(%a1)+ 141 movl (%a0)+,(%a1)+ 142 movl (%a0)+,(%a1)+ 143 movl (%a0)+,(%a1)+ 144 #ifndef __mcoldfire__ 145 dbf %d0,.Lbcf32loop | till done 146 clrw %d0 147 #endif 148 subql #1,%d0 149 jcc .Lbcf32loop 150 151 .Lbcflong: 152 /* copy by longwords */ 153 movel %d1,%d0 154 lsrl #2,%d0 | cnt = len / 4 155 jeq .Lbcfbyte | if (cnt) 156 subql #1,%d0 | set up for dbf 157 .Lbcflloop: 158 movl (%a0)+,(%a1)+ | copy longwords 159 #ifdef __mcoldfire__ 160 subql #1,%d0 | decrement 161 jcc .Lbcflloop | til done 162 #else 163 dbf %d0,.Lbcflloop | til done 164 #endif 165 andl #3,%d1 | len %= 4 166 jeq .Lbcdone 167 168 subql #1,%d1 | set up for dbf 169 .Lbcfbloop: 170 movb (%a0)+,(%a1)+ | copy bytes 171 .Lbcfbyte: 172 #ifdef __mcoldfire__ 173 subql #1,%d0 | decrement 174 jcc .Lbcfbloop | til done 175 #else 176 dbf %d1,.Lbcfbloop | till done 177 #endif 178 .Lbcdone: 179 #if defined(MEMCOPY) || defined(MEMMOVE) 180 movl 4(%sp),%d0 | dest address 181 #if defined(__SVR4_ABI__) 182 moveal %d0,%a0 183 #endif 184 #endif 185 rts 186 187 188 .Lbcback: 189 addl %d1,%a0 | src pointer to end 190 addl %d1,%a1 | dest pointer to end 191 192 /* 193 * It isn't worth the overhead of aligning to {long}word boundries 194 * if the string is too short. 195 */ 196 cmpl #8,%d1 197 jlt .Lbcbbyte 198 199 #ifdef __mc68010__ 200 /* 201 * The 68010 cannot access a word or long on an odd boundary, 202 * period. If the source and the destination addresses aren't 203 * of the same evenness, we're forced to do a bytewise copy. 204 */ 205 movl %a0,%d0 206 addl %a1,%d0 207 btst #0,%d0 208 jne .Lbcbbyte 209 #endif /* __mc68010__ */ 210 211 /* word align */ 212 movl %a1,%d0 213 btst #0,%d0 | if (dst & 1) 214 jeq .Lbcbalgndw | 215 movb -(%a0),-(%a1) | *(char *)dst-- = *(char *) src-- 216 subql #1,%d1 | len-- 217 .Lbcbalgndw: 218 /* long word align */ 219 btst #1,%d0 | if (dst & 2) 220 jeq .Lbcbalgndl 221 movw -(%a0),-(%a1) | *(short *)dst-- = *(short *) dst-- 222 subql #2,%d1 | len -= 2 223 .Lbcbalgndl: 224 /* copy by 8 longwords */ 225 movel %d1,%d0 226 lsrl #5,%d0 | cnt = len / 32 227 jeq .Lbcblong | if (cnt) 228 andl #31,%d1 | len %= 32 229 subql #1,%d0 | set up for dbf 230 .Lbcb32loop: 231 movl -(%a0),-(%a1) | copy 8 long words 232 movl -(%a0),-(%a1) 233 movl -(%a0),-(%a1) 234 movl -(%a0),-(%a1) 235 movl -(%a0),-(%a1) 236 movl -(%a0),-(%a1) 237 movl -(%a0),-(%a1) 238 movl -(%a0),-(%a1) 239 #ifndef __mcoldfire__ 240 dbf %d0,.Lbcb32loop | till done 241 clrw %d0 242 #endif 243 subql #1,%d0 244 jcc .Lbcb32loop 245 246 .Lbcblong: 247 /* copy by longwords */ 248 movel %d1,%d0 249 lsrl #2,%d0 | cnt = len / 4 250 jeq .Lbcbbyte | if (cnt) 251 subql #1,%d0 | set up for dbf 252 .Lbcblloop: 253 movl -(%a0),-(%a1) | copy longwords 254 #ifdef __mcoldfire__ 255 subql #1,%d0 | decrement 256 jcc .Lbcblloop | til done 257 #else 258 dbf %d0,.Lbcblloop | til done 259 #endif 260 andl #3,%d1 | len %= 4 261 jeq .Lbcdone 262 263 subql #1,%d1 | set up for dbf 264 .Lbcbbloop: 265 movb -(%a0),-(%a1) | copy bytes 266 .Lbcbbyte: 267 #ifdef __mcoldfire__ 268 subql #1,%d0 | decrement 269 jcc .Lbcbbloop | til done 270 #else 271 dbf %d1,.Lbcbbloop | till done 272 #endif 273 274 #if defined(MEMCOPY) || defined(MEMMOVE) 275 movl 4(%sp),%d0 | dest address 276 #if defined(__SVR4_ABI__) 277 moveal %d0,%a0 278 #endif 279 #endif 280 rts 281 END(XCOPY) 282
Indexes created Tue Oct 21 12:09:54 GMT 2025