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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 | /* * arch/xtensa/lib/hal/memcopy.S -- Core HAL library functions * xthal_memcpy and xthal_bcopy * * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2002 - 2012 Tensilica Inc. */ #include <variant/core.h> .macro src_b r, w0, w1 #ifdef __XTENSA_EB__ src \r, \w0, \w1 #else src \r, \w1, \w0 #endif .endm .macro ssa8 r #ifdef __XTENSA_EB__ ssa8b \r #else ssa8l \r #endif .endm /* * void *memcpy(void *dst, const void *src, size_t len); * * This function is intended to do the same thing as the standard * library function memcpy() for most cases. * However, where the source and/or destination references * an instruction RAM or ROM or a data RAM or ROM, that * source and/or destination will always be accessed with * 32-bit load and store instructions (as required for these * types of devices). * * !!!!!!! XTFIXME: * !!!!!!! Handling of IRAM/IROM has not yet * !!!!!!! been implemented. * * The (general case) algorithm is as follows: * If destination is unaligned, align it by conditionally * copying 1 and 2 bytes. * If source is aligned, * do 16 bytes with a loop, and then finish up with * 8, 4, 2, and 1 byte copies conditional on the length; * else (if source is unaligned), * do the same, but use SRC to align the source data. * This code tries to use fall-through branches for the common * case of aligned source and destination and multiple * of 4 (or 8) length. * * Register use: * a0/ return address * a1/ stack pointer * a2/ return value * a3/ src * a4/ length * a5/ dst * a6/ tmp * a7/ tmp * a8/ tmp * a9/ tmp * a10/ tmp * a11/ tmp */ .text /* * Byte by byte copy */ .align 4 .byte 0 # 1 mod 4 alignment for LOOPNEZ # (0 mod 4 alignment for LBEG) .Lbytecopy: #if XCHAL_HAVE_LOOPS loopnez a4, .Lbytecopydone #else /* !XCHAL_HAVE_LOOPS */ beqz a4, .Lbytecopydone add a7, a3, a4 # a7 = end address for source #endif /* !XCHAL_HAVE_LOOPS */ .Lnextbyte: l8ui a6, a3, 0 addi a3, a3, 1 s8i a6, a5, 0 addi a5, a5, 1 #if !XCHAL_HAVE_LOOPS bne a3, a7, .Lnextbyte # continue loop if $a3:src != $a7:src_end #endif /* !XCHAL_HAVE_LOOPS */ .Lbytecopydone: retw /* * Destination is unaligned */ .align 4 .Ldst1mod2: # dst is only byte aligned _bltui a4, 7, .Lbytecopy # do short copies byte by byte # copy 1 byte l8ui a6, a3, 0 addi a3, a3, 1 addi a4, a4, -1 s8i a6, a5, 0 addi a5, a5, 1 _bbci.l a5, 1, .Ldstaligned # if dst is now aligned, then # return to main algorithm .Ldst2mod4: # dst 16-bit aligned # copy 2 bytes _bltui a4, 6, .Lbytecopy # do short copies byte by byte l8ui a6, a3, 0 l8ui a7, a3, 1 addi a3, a3, 2 addi a4, a4, -2 s8i a6, a5, 0 s8i a7, a5, 1 addi a5, a5, 2 j .Ldstaligned # dst is now aligned, return to main algorithm .align 4 .global memcpy .type memcpy,@function memcpy: entry sp, 16 # minimal stack frame # a2/ dst, a3/ src, a4/ len mov a5, a2 # copy dst so that a2 is return value .Lcommon: _bbsi.l a2, 0, .Ldst1mod2 # if dst is 1 mod 2 _bbsi.l a2, 1, .Ldst2mod4 # if dst is 2 mod 4 .Ldstaligned: # return here from .Ldst?mod? once dst is aligned srli a7, a4, 4 # number of loop iterations with 16B # per iteration movi a8, 3 # if source is not aligned, _bany a3, a8, .Lsrcunaligned # then use shifting copy /* * Destination and source are word-aligned, use word copy. */ # copy 16 bytes per iteration for word-aligned dst and word-aligned src #if XCHAL_HAVE_LOOPS loopnez a7, .Loop1done #else /* !XCHAL_HAVE_LOOPS */ beqz a7, .Loop1done slli a8, a7, 4 add a8, a8, a3 # a8 = end of last 16B source chunk #endif /* !XCHAL_HAVE_LOOPS */ .Loop1: l32i a6, a3, 0 l32i a7, a3, 4 s32i a6, a5, 0 l32i a6, a3, 8 s32i a7, a5, 4 l32i a7, a3, 12 s32i a6, a5, 8 addi a3, a3, 16 s32i a7, a5, 12 addi a5, a5, 16 #if !XCHAL_HAVE_LOOPS bne a3, a8, .Loop1 # continue loop if a3:src != a8:src_end #endif /* !XCHAL_HAVE_LOOPS */ .Loop1done: bbci.l a4, 3, .L2 # copy 8 bytes l32i a6, a3, 0 l32i a7, a3, 4 addi a3, a3, 8 s32i a6, a5, 0 s32i a7, a5, 4 addi a5, a5, 8 .L2: bbsi.l a4, 2, .L3 bbsi.l a4, 1, .L4 bbsi.l a4, 0, .L5 retw .L3: # copy 4 bytes l32i a6, a3, 0 addi a3, a3, 4 s32i a6, a5, 0 addi a5, a5, 4 bbsi.l a4, 1, .L4 bbsi.l a4, 0, .L5 retw .L4: # copy 2 bytes l16ui a6, a3, 0 addi a3, a3, 2 s16i a6, a5, 0 addi a5, a5, 2 bbsi.l a4, 0, .L5 retw .L5: # copy 1 byte l8ui a6, a3, 0 s8i a6, a5, 0 retw /* * Destination is aligned, Source is unaligned */ .align 4 .Lsrcunaligned: _beqz a4, .Ldone # avoid loading anything for zero-length copies # copy 16 bytes per iteration for word-aligned dst and unaligned src ssa8 a3 # set shift amount from byte offset /* set to 1 when running on ISS (simulator) with the lint or ferret client, or 0 to save a few cycles */ #define SIM_CHECKS_ALIGNMENT 1 #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT and a11, a3, a8 # save unalignment offset for below sub a3, a3, a11 # align a3 #endif l32i a6, a3, 0 # load first word #if XCHAL_HAVE_LOOPS loopnez a7, .Loop2done #else /* !XCHAL_HAVE_LOOPS */ beqz a7, .Loop2done slli a10, a7, 4 add a10, a10, a3 # a10 = end of last 16B source chunk #endif /* !XCHAL_HAVE_LOOPS */ .Loop2: l32i a7, a3, 4 l32i a8, a3, 8 src_b a6, a6, a7 s32i a6, a5, 0 l32i a9, a3, 12 src_b a7, a7, a8 s32i a7, a5, 4 l32i a6, a3, 16 src_b a8, a8, a9 s32i a8, a5, 8 addi a3, a3, 16 src_b a9, a9, a6 s32i a9, a5, 12 addi a5, a5, 16 #if !XCHAL_HAVE_LOOPS bne a3, a10, .Loop2 # continue loop if a3:src != a10:src_end #endif /* !XCHAL_HAVE_LOOPS */ .Loop2done: bbci.l a4, 3, .L12 # copy 8 bytes l32i a7, a3, 4 l32i a8, a3, 8 src_b a6, a6, a7 s32i a6, a5, 0 addi a3, a3, 8 src_b a7, a7, a8 s32i a7, a5, 4 addi a5, a5, 8 mov a6, a8 .L12: bbci.l a4, 2, .L13 # copy 4 bytes l32i a7, a3, 4 addi a3, a3, 4 src_b a6, a6, a7 s32i a6, a5, 0 addi a5, a5, 4 mov a6, a7 .L13: #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT add a3, a3, a11 # readjust a3 with correct misalignment #endif bbsi.l a4, 1, .L14 bbsi.l a4, 0, .L15 .Ldone: retw .L14: # copy 2 bytes l8ui a6, a3, 0 l8ui a7, a3, 1 addi a3, a3, 2 s8i a6, a5, 0 s8i a7, a5, 1 addi a5, a5, 2 bbsi.l a4, 0, .L15 retw .L15: # copy 1 byte l8ui a6, a3, 0 s8i a6, a5, 0 retw /* * void bcopy(const void *src, void *dest, size_t n); */ .align 4 .global bcopy .type bcopy,@function bcopy: entry sp, 16 # minimal stack frame # a2=src, a3=dst, a4=len mov a5, a3 mov a3, a2 mov a2, a5 j .Lmovecommon # go to common code for memmove+bcopy /* * void *memmove(void *dst, const void *src, size_t len); * * This function is intended to do the same thing as the standard * library function memmove() for most cases. * However, where the source and/or destination references * an instruction RAM or ROM or a data RAM or ROM, that * source and/or destination will always be accessed with * 32-bit load and store instructions (as required for these * types of devices). * * !!!!!!! XTFIXME: * !!!!!!! Handling of IRAM/IROM has not yet * !!!!!!! been implemented. * * The (general case) algorithm is as follows: * If end of source doesn't overlap destination then use memcpy. * Otherwise do memcpy backwards. * * Register use: * a0/ return address * a1/ stack pointer * a2/ return value * a3/ src * a4/ length * a5/ dst * a6/ tmp * a7/ tmp * a8/ tmp * a9/ tmp * a10/ tmp * a11/ tmp */ /* * Byte by byte copy */ .align 4 .byte 0 # 1 mod 4 alignment for LOOPNEZ # (0 mod 4 alignment for LBEG) .Lbackbytecopy: #if XCHAL_HAVE_LOOPS loopnez a4, .Lbackbytecopydone #else /* !XCHAL_HAVE_LOOPS */ beqz a4, .Lbackbytecopydone sub a7, a3, a4 # a7 = start address for source #endif /* !XCHAL_HAVE_LOOPS */ .Lbacknextbyte: addi a3, a3, -1 l8ui a6, a3, 0 addi a5, a5, -1 s8i a6, a5, 0 #if !XCHAL_HAVE_LOOPS bne a3, a7, .Lbacknextbyte # continue loop if # $a3:src != $a7:src_start #endif /* !XCHAL_HAVE_LOOPS */ .Lbackbytecopydone: retw /* * Destination is unaligned */ .align 4 .Lbackdst1mod2: # dst is only byte aligned _bltui a4, 7, .Lbackbytecopy # do short copies byte by byte # copy 1 byte addi a3, a3, -1 l8ui a6, a3, 0 addi a5, a5, -1 s8i a6, a5, 0 addi a4, a4, -1 _bbci.l a5, 1, .Lbackdstaligned # if dst is now aligned, then # return to main algorithm .Lbackdst2mod4: # dst 16-bit aligned # copy 2 bytes _bltui a4, 6, .Lbackbytecopy # do short copies byte by byte addi a3, a3, -2 l8ui a6, a3, 0 l8ui a7, a3, 1 addi a5, a5, -2 s8i a6, a5, 0 s8i a7, a5, 1 addi a4, a4, -2 j .Lbackdstaligned # dst is now aligned, # return to main algorithm .align 4 .global memmove .type memmove,@function memmove: entry sp, 16 # minimal stack frame # a2/ dst, a3/ src, a4/ len mov a5, a2 # copy dst so that a2 is return value .Lmovecommon: sub a6, a5, a3 bgeu a6, a4, .Lcommon add a5, a5, a4 add a3, a3, a4 _bbsi.l a5, 0, .Lbackdst1mod2 # if dst is 1 mod 2 _bbsi.l a5, 1, .Lbackdst2mod4 # if dst is 2 mod 4 .Lbackdstaligned: # return here from .Lbackdst?mod? once dst is aligned srli a7, a4, 4 # number of loop iterations with 16B # per iteration movi a8, 3 # if source is not aligned, _bany a3, a8, .Lbacksrcunaligned # then use shifting copy /* * Destination and source are word-aligned, use word copy. */ # copy 16 bytes per iteration for word-aligned dst and word-aligned src #if XCHAL_HAVE_LOOPS loopnez a7, .backLoop1done #else /* !XCHAL_HAVE_LOOPS */ beqz a7, .backLoop1done slli a8, a7, 4 sub a8, a3, a8 # a8 = start of first 16B source chunk #endif /* !XCHAL_HAVE_LOOPS */ .backLoop1: addi a3, a3, -16 l32i a7, a3, 12 l32i a6, a3, 8 addi a5, a5, -16 s32i a7, a5, 12 l32i a7, a3, 4 s32i a6, a5, 8 l32i a6, a3, 0 s32i a7, a5, 4 s32i a6, a5, 0 #if !XCHAL_HAVE_LOOPS bne a3, a8, .backLoop1 # continue loop if a3:src != a8:src_start #endif /* !XCHAL_HAVE_LOOPS */ .backLoop1done: bbci.l a4, 3, .Lback2 # copy 8 bytes addi a3, a3, -8 l32i a6, a3, 0 l32i a7, a3, 4 addi a5, a5, -8 s32i a6, a5, 0 s32i a7, a5, 4 .Lback2: bbsi.l a4, 2, .Lback3 bbsi.l a4, 1, .Lback4 bbsi.l a4, 0, .Lback5 retw .Lback3: # copy 4 bytes addi a3, a3, -4 l32i a6, a3, 0 addi a5, a5, -4 s32i a6, a5, 0 bbsi.l a4, 1, .Lback4 bbsi.l a4, 0, .Lback5 retw .Lback4: # copy 2 bytes addi a3, a3, -2 l16ui a6, a3, 0 addi a5, a5, -2 s16i a6, a5, 0 bbsi.l a4, 0, .Lback5 retw .Lback5: # copy 1 byte addi a3, a3, -1 l8ui a6, a3, 0 addi a5, a5, -1 s8i a6, a5, 0 retw /* * Destination is aligned, Source is unaligned */ .align 4 .Lbacksrcunaligned: _beqz a4, .Lbackdone # avoid loading anything for zero-length copies # copy 16 bytes per iteration for word-aligned dst and unaligned src ssa8 a3 # set shift amount from byte offset #define SIM_CHECKS_ALIGNMENT 1 /* set to 1 when running on ISS with * the lint or ferret client, or 0 * to save a few cycles */ #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT and a11, a3, a8 # save unalignment offset for below sub a3, a3, a11 # align a3 #endif l32i a6, a3, 0 # load first word #if XCHAL_HAVE_LOOPS loopnez a7, .backLoop2done #else /* !XCHAL_HAVE_LOOPS */ beqz a7, .backLoop2done slli a10, a7, 4 sub a10, a3, a10 # a10 = start of first 16B source chunk #endif /* !XCHAL_HAVE_LOOPS */ .backLoop2: addi a3, a3, -16 l32i a7, a3, 12 l32i a8, a3, 8 addi a5, a5, -16 src_b a6, a7, a6 s32i a6, a5, 12 l32i a9, a3, 4 src_b a7, a8, a7 s32i a7, a5, 8 l32i a6, a3, 0 src_b a8, a9, a8 s32i a8, a5, 4 src_b a9, a6, a9 s32i a9, a5, 0 #if !XCHAL_HAVE_LOOPS bne a3, a10, .backLoop2 # continue loop if a3:src != a10:src_start #endif /* !XCHAL_HAVE_LOOPS */ .backLoop2done: bbci.l a4, 3, .Lback12 # copy 8 bytes addi a3, a3, -8 l32i a7, a3, 4 l32i a8, a3, 0 addi a5, a5, -8 src_b a6, a7, a6 s32i a6, a5, 4 src_b a7, a8, a7 s32i a7, a5, 0 mov a6, a8 .Lback12: bbci.l a4, 2, .Lback13 # copy 4 bytes addi a3, a3, -4 l32i a7, a3, 0 addi a5, a5, -4 src_b a6, a7, a6 s32i a6, a5, 0 mov a6, a7 .Lback13: #if XCHAL_UNALIGNED_LOAD_EXCEPTION || SIM_CHECKS_ALIGNMENT add a3, a3, a11 # readjust a3 with correct misalignment #endif bbsi.l a4, 1, .Lback14 bbsi.l a4, 0, .Lback15 .Lbackdone: retw .Lback14: # copy 2 bytes addi a3, a3, -2 l8ui a6, a3, 0 l8ui a7, a3, 1 addi a5, a5, -2 s8i a6, a5, 0 s8i a7, a5, 1 bbsi.l a4, 0, .Lback15 retw .Lback15: # copy 1 byte addi a3, a3, -1 addi a5, a5, -1 l8ui a6, a3, 0 s8i a6, a5, 0 retw /* * Local Variables: * mode:fundamental * comment-start: "# " * comment-start-skip: "# *" * End: */ |