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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 | /* * String handling functions for PowerPC. * * Copyright (C) 1996 Paul Mackerras. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include "../kernel/ppc_asm.tmpl" #include <asm/processor.h> #include <asm/errno.h> .globl strcpy strcpy: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r5) bne 1b blr .globl strncpy strncpy: cmpwi 0,r5,0 beqlr mtctr r5 addi r6,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r6) bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ blr .globl strcat strcat: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r0,1(r5) cmpwi 0,r0,0 bne 1b addi r5,r5,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r5) bne 1b blr .globl strcmp strcmp: addi r5,r3,-1 addi r4,r4,-1 1: lbzu r3,1(r5) cmpwi 1,r3,0 lbzu r0,1(r4) subf. r3,r0,r3 beqlr 1 beq 1b blr .globl strlen strlen: addi r4,r3,-1 1: lbzu r0,1(r4) cmpwi 0,r0,0 bne 1b subf r3,r3,r4 blr .globl memset memset: rlwimi r4,r4,8,16,23 rlwimi r4,r4,16,0,15 addi r6,r3,-4 cmplwi 0,r5,4 blt 7f stwu r4,4(r6) beqlr andi. r0,r6,3 add r5,r0,r5 subf r6,r0,r6 rlwinm r0,r5,32-2,2,31 mtctr r0 bdz 6f 1: stwu r4,4(r6) bdnz 1b 6: andi. r5,r5,3 7: cmpwi 0,r5,0 beqlr mtctr r5 addi r6,r6,3 8: stbu r4,1(r6) bdnz 8b blr .globl bcopy bcopy: mr r6,r3 mr r3,r4 mr r4,r6 b memcpy .globl memmove memmove: cmplw 0,r3,r4 bgt backwards_memcpy /* fall through */ .globl memcpy memcpy: rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ addi r6,r3,-4 addi r4,r4,-4 beq 2f /* if less than 8 bytes to do */ andi. r0,r6,3 /* get dest word aligned */ mtctr r7 bne 5f 1: lwz r7,4(r4) lwzu r8,8(r4) stw r7,4(r6) stwu r8,8(r6) bdnz 1b andi. r5,r5,7 2: cmplwi 0,r5,4 blt 3f lwzu r0,4(r4) addi r5,r5,-4 stwu r0,4(r6) 3: cmpwi 0,r5,0 beqlr mtctr r5 addi r4,r4,3 addi r6,r6,3 4: lbzu r0,1(r4) stbu r0,1(r6) bdnz 4b blr 5: subfic r0,r0,4 mtctr r0 6: lbz r7,4(r4) addi r4,r4,1 stb r7,4(r6) addi r6,r6,1 bdnz 6b subf r5,r0,r5 rlwinm. r7,r5,32-3,3,31 beq 2b mtctr r7 b 1b .globl backwards_memcpy backwards_memcpy: rlwinm. r7,r5,32-3,3,31 /* r0 = r5 >> 3 */ add r6,r3,r5 add r4,r4,r5 beq 2f andi. r0,r6,3 mtctr r7 bne 5f 1: lwz r7,-4(r4) lwzu r8,-8(r4) stw r7,-4(r6) stwu r8,-8(r6) bdnz 1b andi. r5,r5,7 2: cmplwi 0,r5,4 blt 3f lwzu r0,-4(r4) subi r5,r5,4 stwu r0,-4(r6) 3: cmpwi 0,r5,0 beqlr mtctr r5 4: lbzu r0,-1(r4) stbu r0,-1(r6) bdnz 4b blr 5: mtctr r0 6: lbzu r7,-1(r4) stbu r7,-1(r6) bdnz 6b subf r5,r0,r5 rlwinm. r7,r5,32-3,3,31 beq 2b mtctr r7 b 1b .globl memcmp memcmp: cmpwi 0,r5,0 ble- 2f mtctr r5 addi r6,r3,-1 addi r4,r4,-1 1: lbzu r3,1(r6) lbzu r0,1(r4) subf. r3,r0,r3 bdnzt 2,1b blr 2: li r3,0 blr .global memchr memchr: cmpwi 0,r5,0 ble- 2f mtctr r5 addi r3,r3,-1 1: lbzu r0,1(r3) cmpw 0,r0,r4 bdnzf 2,1b beqlr 2: li r3,0 blr .globl __copy_tofrom_user __copy_tofrom_user: srwi. r7,r5,3 addi r6,r3,-4 addi r4,r4,-4 li r3,0 /* success return value */ beq 2f /* if less than 8 bytes to do */ andi. r0,r6,3 /* get dest word aligned */ mtctr r7 bne 5f 1: lwz r7,4(r4) 11: lwzu r8,8(r4) 12: stw r7,4(r6) 13: stwu r8,8(r6) bdnz 1b andi. r5,r5,7 2: cmplwi 0,r5,4 blt 3f 14: lwzu r0,4(r4) addi r5,r5,-4 15: stwu r0,4(r6) 3: cmpwi 0,r5,0 /* do 1 byte at a time for the remainder */ beqlr mtctr r5 addi r4,r4,3 addi r6,r6,3 4: lbzu r0,1(r4) 16: stbu r0,1(r6) bdnz 4b blr 5: subfic r0,r0,4 /* copy bytes until we have the */ mtctr r0 /* destination 4-byte aligned */ subf r5,r0,r5 6: lbz r7,4(r4) addi r4,r4,1 17: stb r7,4(r6) addi r6,r6,1 bdnz 6b srwi. r7,r5,3 beq 2b mtctr r7 b 1b /* we come here on a fault in the 8-byte-at-a-time loop */ 88: subi r4,r4,8 /* compensate for the lwzu */ 98: mfctr r0 rlwimi r5,r0,3,0,28 /* use the byte-at-a-time loop to */ b 3b /* copy up to the byte at fault */ /* here on a write fault in the single-word copy */ 96: subi r4,r4,4 b 3b /* here on a read fault in the initial single-byte copy */ 90: mfctr r3 add r3,r3,r5 b 70f /* here on a read fault in the final single-byte copy */ 99: mfctr r3 subi r6,r6,3 /* clear out the rest of the destination: r3 bytes starting at 4(r6) */ 70: li r0,0 mr. r5,r3 beq 76f 71: andi. r4,r6,3 beq 72f 77: stb r0,4(r6) addi r6,r6,1 addic. r5,r5,-1 bne 71b 72: srwi. r7,r5,2 beq 73f mtctr r7 74: stwu r0,4(r6) bdnz 74b 73: andi. r5,r5,3 beq 76f mtctr r5 addi r6,r6,3 75: stbu r0,1(r6) bdnz 75b 76: blr /* here on a write fault in the initial single-byte copy */ 80: mfctr r3 add r3,r3,r5 blr /* here on a write fault in the final single-byte copy */ 81: mfctr r3 blr .section __ex_table,"a" .align 2 .long 1b,98b .long 11b,98b .long 12b,88b .long 13b,88b .long 14b,3b .long 15b,96b .long 4b,99b .long 16b,81b .long 6b,90b .long 17b,80b .long 77b,76b .long 74b,76b .long 75b,76b .text .globl __clear_user __clear_user: addi r6,r3,-4 li r3,0 li r5,0 cmplwi 0,r4,4 blt 7f /* clear a single word */ 11: stwu r5,4(r6) beqlr /* clear word sized chunks */ andi. r0,r6,3 add r4,r0,r4 subf r6,r0,r6 /*rlwinm r0,r4,32-2,2,31*/ srwi r0,r4,2 mtctr r0 bdz 6f 1: stwu r5,4(r6) bdnz 1b 6: andi. r4,r4,3 /* clear byte sized chunks */ 7: cmpwi 0,r4,0 beqlr mtctr r4 addi r6,r6,3 8: stbu r5,1(r6) bdnz 8b blr 99: li r3,-EFAULT blr .section __ex_table,"a" .align 2 .long 11b,99b .long 1b,99b .long 8b,99b .text .globl __strncpy_from_user __strncpy_from_user: addi r6,r3,-1 addi r4,r4,-1 cmpwi 0,r5,0 beq 2f mtctr r5 1: lbzu r0,1(r4) cmpwi 0,r0,0 stbu r0,1(r6) bdnzf 2,1b /* dec ctr, branch if ctr != 0 && !cr0.eq */ beq 3f 2: addi r6,r6,1 3: subf r3,r3,r6 blr 99: li r3,-EFAULT blr .section __ex_table,"a" .align 2 .long 1b,99b .text /* r3 = str, r4 = len (> 0), r5 = top (highest addr) */ .globl __strnlen_user __strnlen_user: addi r7,r3,-1 subf r6,r7,r5 /* top+1 - str */ cmplw 0,r4,r6 bge 0f mr r6,r4 0: mtctr r6 /* ctr = min(len, top - str) */ 1: lbzu r0,1(r7) /* get next byte */ cmpwi 0,r0,0 bdnzf 2,1b /* loop if --ctr != 0 && byte != 0 */ addi r7,r7,1 subf r3,r3,r7 /* number of bytes we have looked at */ beqlr /* return if we found a 0 byte */ cmpw 0,r3,r4 /* did we look at all len bytes? */ blt 99f /* if not, must have hit top */ addi r3,r4,1 /* return len + 1 to indicate no null found */ blr 99: li r3,0 /* bad address, return 0 */ blr .section __ex_table,"a" .align 2 .long 1b,99b |