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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 | /* * 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. * * $Id: memcpy.S,v 1.3 1998/07/10 01:14:49 ralf Exp $ * * Unified implementation of memcpy, memmove and the __copy_user backend. * For __rmemcpy and memmove an exception is always a kernel bug, therefore * they're not protected. In order to keep the exception fixup routine * simple all memory accesses in __copy_user to src rsp. dst are stricly * incremental. The fixup routine depends on $at not being changed. */ #include <asm/asm.h> #include <asm/offset.h> #include <asm/regdef.h> /* * The fixup routine for copy_to_user depends on copying strictly in * increasing order. Gas expands the ulw/usw macros in the wrong order for * little endian machines, so we cannot depend on them. */ #ifdef __MIPSEB__ #define uswL swl #define uswU swr #define ulwL lwl #define ulwU lwr #endif #ifdef __MIPSEL__ #define uswL swr #define uswU swl #define ulwL lwr #define ulwU lwl #endif #define EX(insn,reg,addr,handler) \ 9: insn reg, addr; \ .section __ex_table,"a"; \ PTR 9b, handler; \ .previous #define UEX(insn,reg,addr,handler) \ 9: insn ## L reg, addr; \ 10: insn ## U reg, 3 + addr; \ .section __ex_table,"a"; \ PTR 9b, handler; \ PTR 10b, handler; \ .previous /* ascending order, destination aligned */ #define MOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3) \ EX(lw, t0, (offset + 0x00)(src), l_fixup); \ EX(lw, t1, (offset + 0x04)(src), l_fixup); \ EX(lw, t2, (offset + 0x08)(src), l_fixup); \ EX(lw, t3, (offset + 0x0c)(src), l_fixup); \ EX(sw, t0, (offset + 0x00)(dst), s_fixup); \ EX(sw, t1, (offset + 0x04)(dst), s_fixup); \ EX(sw, t2, (offset + 0x08)(dst), s_fixup); \ EX(sw, t3, (offset + 0x0c)(dst), s_fixup); \ EX(lw, t0, (offset + 0x10)(src), l_fixup); \ EX(lw, t1, (offset + 0x14)(src), l_fixup); \ EX(lw, t2, (offset + 0x18)(src), l_fixup); \ EX(lw, t3, (offset + 0x1c)(src), l_fixup); \ EX(sw, t0, (offset + 0x10)(dst), s_fixup); \ EX(sw, t1, (offset + 0x14)(dst), s_fixup); \ EX(sw, t2, (offset + 0x18)(dst), s_fixup); \ EX(sw, t3, (offset + 0x1c)(dst), s_fixup) /* ascending order, destination unaligned */ #define UMOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3) \ EX(lw, t0, (offset + 0x00)(src), l_fixup); \ EX(lw, t1, (offset + 0x04)(src), l_fixup); \ EX(lw, t2, (offset + 0x08)(src), l_fixup); \ EX(lw, t3, (offset + 0x0c)(src), l_fixup); \ UEX(usw, t0, (offset + 0x00)(dst), s_fixup); \ UEX(usw, t1, (offset + 0x04)(dst), s_fixup); \ UEX(usw, t2, (offset + 0x08)(dst), s_fixup); \ UEX(usw, t3, (offset + 0x0c)(dst), s_fixup); \ EX(lw, t0, (offset + 0x10)(src), l_fixup); \ EX(lw, t1, (offset + 0x14)(src), l_fixup); \ EX(lw, t2, (offset + 0x18)(src), l_fixup); \ EX(lw, t3, (offset + 0x1c)(src), l_fixup); \ UEX(usw, t0, (offset + 0x10)(dst), s_fixup); \ UEX(usw, t1, (offset + 0x14)(dst), s_fixup); \ UEX(usw, t2, (offset + 0x18)(dst), s_fixup); \ UEX(usw, t3, (offset + 0x1c)(dst), s_fixup) .text .set noreorder .set noat .align 5 LEAF(memcpy) /* a0=dst a1=src a2=len */ move v0, a0 /* return value */ __memcpy: EXPORT(__copy_user) xor t0, a0, a1 andi t0, t0, 0x3 move t7, a0 beqz t0, can_align sltiu t8, a2, 0x8 b memcpy_u_src # bad alignment move t2, a2 can_align: bnez t8, small_memcpy # < 8 bytes to copy move t2, a2 beqz a2, out andi t8, a1, 0x1 hword_align: beqz t8, word_align andi t8, a1, 0x2 EX(lb, t0, (a1), l_fixup) subu a2, a2, 0x1 EX(sb, t0, (a0), s_fixup) addu a1, a1, 0x1 addu a0, a0, 0x1 andi t8, a1, 0x2 word_align: beqz t8, dword_align sltiu t8, a2, 56 EX(lh, t0, (a1), l_fixup) subu a2, a2, 0x2 EX(sh, t0, (a0), s_fixup) sltiu t8, a2, 56 addu a0, a0, 0x2 addu a1, a1, 0x2 dword_align: bnez t8, do_end_words move t8, a2 andi t8, a1, 0x4 beqz t8, qword_align andi t8, a1, 0x8 EX(lw, t0, 0x00(a1), l_fixup) subu a2, a2, 0x4 EX(sw, t0, 0x00(a0), s_fixup) addu a1, a1, 0x4 addu a0, a0, 0x4 andi t8, a1, 0x8 qword_align: beqz t8, oword_align andi t8, a1, 0x10 EX(lw, t0, 0x00(a1), l_fixup) EX(lw, t1, 0x04(a1), l_fixup) subu a2, a2, 0x8 EX(sw, t0, 0x00(a0), s_fixup) EX(sw, t1, 0x04(a0), s_fixup) addu a1, a1, 0x8 andi t8, a1, 0x10 addu a0, a0, 0x8 oword_align: beqz t8, begin_movement srl t8, a2, 0x7 EX(lw, t3, 0x00(a1), l_fixup) EX(lw, t4, 0x04(a1), l_fixup) EX(lw, t0, 0x08(a1), l_fixup) EX(lw, t1, 0x0c(a1), l_fixup) EX(sw, t3, 0x00(a0), s_fixup) EX(sw, t4, 0x04(a0), s_fixup) EX(sw, t0, 0x08(a0), s_fixup) EX(sw, t1, 0x0c(a0), s_fixup) subu a2, a2, 0x10 addu a1, a1, 0x10 srl t8, a2, 0x7 addu a0, a0, 0x10 begin_movement: beqz t8, 0f andi t2, a2, 0x40 move_128bytes: MOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) MOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) MOVE_BIGCHUNK(a1, a0, 0x40, t0, t1, t3, t4) MOVE_BIGCHUNK(a1, a0, 0x60, t0, t1, t3, t4) subu t8, t8, 0x01 addu a1, a1, 0x80 bnez t8, move_128bytes addu a0, a0, 0x80 0: beqz t2, 1f andi t2, a2, 0x20 move_64bytes: MOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) MOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) addu a1, a1, 0x40 addu a0, a0, 0x40 1: beqz t2, do_end_words andi t8, a2, 0x1c move_32bytes: MOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) andi t8, a2, 0x1c addu a1, a1, 0x20 addu a0, a0, 0x20 do_end_words: beqz t8, maybe_end_cruft srl t8, t8, 0x2 end_words: EX(lw, t0, (a1), l_fixup) subu t8, t8, 0x1 EX(sw, t0, (a0), s_fixup) addu a1, a1, 0x4 bnez t8, end_words addu a0, a0, 0x4 maybe_end_cruft: andi t2, a2, 0x3 small_memcpy: beqz t2, out move a2, t2 end_bytes: EX(lb, t0, (a1), l_fixup) subu a2, a2, 0x1 EX(sb, t0, (a0), s_fixup) addu a1, a1, 0x1 bnez a2, end_bytes addu a0, a0, 0x1 out: jr ra move a2, zero /* ------------------------------------------------------------------------- */ /* Bad, bad. At least try to align the source */ memcpy_u_src: bnez t8, small_memcpy # < 8 bytes? move t2, a2 addiu t0, a1, 7 # t0: how much to align ori t0, 7 xori t0, 7 subu t0, a1 UEX(ulw, t1, 0(a1), l_fixup) # dword alignment UEX(ulw, t2, 4(a1), l_fixup) UEX(usw, t1, 0(a0), s_fixup) UEX(usw, t2, 4(a0), s_fixup) addu a1, t0 # src addu a0, t0 # dst subu a2, t0 # len sltiu t8, a2, 56 bnez t8, u_do_end_words andi t8, a2, 0x3c andi t8, a1, 8 # now qword aligned? u_qword_align: beqz t8, u_oword_align andi t8, a1, 0x10 EX(lw, t0, 0x00(a1), l_fixup) EX(lw, t1, 0x04(a1), l_fixup) subu a2, a2, 0x8 UEX(usw, t0, 0x00(a0), s_fixup) UEX(usw, t1, 0x04(a0), s_fixup) addu a1, a1, 0x8 andi t8, a1, 0x10 addu a0, a0, 0x8 u_oword_align: beqz t8, u_begin_movement srl t8, a2, 0x7 EX(lw, t3, 0x08(a1), l_fixup) EX(lw, t4, 0x0c(a1), l_fixup) EX(lw, t0, 0x00(a1), l_fixup) EX(lw, t1, 0x04(a1), l_fixup) UEX(usw, t3, 0x08(a0), s_fixup) UEX(usw, t4, 0x0c(a0), s_fixup) UEX(usw, t0, 0x00(a0), s_fixup) UEX(usw, t1, 0x04(a0), s_fixup) subu a2, a2, 0x10 addu a1, a1, 0x10 srl t8, a2, 0x7 addu a0, a0, 0x10 u_begin_movement: beqz t8, 0f andi t2, a2, 0x40 u_move_128bytes: UMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) UMOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) UMOVE_BIGCHUNK(a1, a0, 0x40, t0, t1, t3, t4) UMOVE_BIGCHUNK(a1, a0, 0x60, t0, t1, t3, t4) subu t8, t8, 0x01 addu a1, a1, 0x80 bnez t8, u_move_128bytes addu a0, a0, 0x80 0: beqz t2, 1f andi t2, a2, 0x20 u_move_64bytes: UMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) UMOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) addu a1, a1, 0x40 addu a0, a0, 0x40 1: beqz t2, u_do_end_words andi t8, a2, 0x1c u_move_32bytes: UMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) andi t8, a2, 0x1c addu a1, a1, 0x20 addu a0, a0, 0x20 u_do_end_words: beqz t8, u_maybe_end_cruft srl t8, t8, 0x2 u_end_words: EX(lw, t0, 0x00(a1), l_fixup) subu t8, t8, 0x1 UEX(usw, t0, 0x00(a0), s_fixup) addu a1, a1, 0x4 bnez t8, u_end_words addu a0, a0, 0x4 u_maybe_end_cruft: andi t2, a2, 0x3 u_cannot_optimize: beqz t2, out move a2, t2 u_end_bytes: EX(lb, t0, (a1), l_fixup) subu a2, a2, 0x1 EX(sb, t0, (a0), s_fixup) addu a1, a1, 0x1 bnez a2, u_end_bytes addu a0, a0, 0x1 jr ra move a2, zero END(memcpy) /* descending order, destination aligned */ #define RMOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3) \ lw t0, (offset + 0x10)(src); \ lw t1, (offset + 0x14)(src); \ lw t2, (offset + 0x18)(src); \ lw t3, (offset + 0x1c)(src); \ sw t0, (offset + 0x10)(dst); \ sw t1, (offset + 0x14)(dst); \ sw t2, (offset + 0x18)(dst); \ sw t3, (offset + 0x1c)(dst); \ lw t0, (offset + 0x00)(src); \ lw t1, (offset + 0x04)(src); \ lw t2, (offset + 0x08)(src); \ lw t3, (offset + 0x0c)(src); \ sw t0, (offset + 0x00)(dst); \ sw t1, (offset + 0x04)(dst); \ sw t2, (offset + 0x08)(dst); \ sw t3, (offset + 0x0c)(dst) /* descending order, destination ununaligned */ #define RUMOVE_BIGCHUNK(src, dst, offset, t0, t1, t2, t3) \ lw t0, (offset + 0x10)(src); \ lw t1, (offset + 0x14)(src); \ lw t2, (offset + 0x18)(src); \ lw t3, (offset + 0x1c)(src); \ usw t0, (offset + 0x10)(dst); \ usw t1, (offset + 0x14)(dst); \ usw t2, (offset + 0x18)(dst); \ usw t3, (offset + 0x1c)(dst); \ lw t0, (offset + 0x00)(src); \ lw t1, (offset + 0x04)(src); \ lw t2, (offset + 0x08)(src); \ lw t3, (offset + 0x0c)(src); \ usw t0, (offset + 0x00)(dst); \ usw t1, (offset + 0x04)(dst); \ usw t2, (offset + 0x08)(dst); \ usw t3, (offset + 0x0c)(dst) .align 5 LEAF(memmove) sltu t0, a0, a1 # dst < src -> memcpy bnez t0, memcpy addu v0, a0, a2 sltu t0, v0, a1 # dst + len < src -> non- bnez t0, __memcpy # overlapping, can use memcpy move v0, a0 /* return value */ END(memmove) LEAF(__rmemcpy) /* a0=dst a1=src a2=len */ addu a0, a2 # dst = dst + len addu a1, a2 # src = src + len #if 0 /* Horror fix */ xor t0, a0, a1 andi t0, t0, 0x3 move t7, a0 beqz t0, r_can_align sltiu t8, a2, 0x8 b r_memcpy_u_src # bad alignment move t2, a2 r_can_align: bnez t8, r_small_memcpy # < 8 bytes to copy move t2, a2 beqz a2, r_out andi t8, a1, 0x1 r_hword_align: beqz t8, r_word_align andi t8, a1, 0x2 lb t0, -1(a1) subu a2, a2, 0x1 sb t0, -1(a0) subu a1, a1, 0x1 subu a0, a0, 0x1 andi t8, a1, 0x2 r_word_align: beqz t8, r_dword_align sltiu t8, a2, 56 lh t0, -2(a1) subu a2, a2, 0x2 sh t0, -2(a0) sltiu t8, a2, 56 subu a0, a0, 0x2 subu a1, a1, 0x2 r_dword_align: bnez t8, r_do_end_words move t8, a2 andi t8, a1, 0x4 beqz t8, r_qword_align andi t8, a1, 0x8 lw t0, -4(a1) subu a2, a2, 0x4 sw t0, -4(a0) subu a1, a1, 0x4 subu a0, a0, 0x4 andi t8, a1, 0x8 r_qword_align: beqz t8, r_oword_align andi t8, a1, 0x10 subu a1, a1, 0x8 lw t0, 0x04(a1) lw t1, 0x00(a1) subu a0, a0, 0x8 sw t0, 0x04(a0) sw t1, 0x00(a0) subu a2, a2, 0x8 andi t8, a1, 0x10 r_oword_align: beqz t8, r_begin_movement srl t8, a2, 0x7 subu a1, a1, 0x10 lw t3, 0x08(a1) # assumes subblock ordering lw t4, 0x0c(a1) lw t0, 0x00(a1) lw t1, 0x04(a1) subu a0, a0, 0x10 sw t3, 0x08(a0) sw t4, 0x0c(a0) sw t0, 0x00(a0) sw t1, 0x04(a0) subu a2, a2, 0x10 srl t8, a2, 0x7 r_begin_movement: beqz t8, 0f andi t2, a2, 0x40 r_move_128bytes: RMOVE_BIGCHUNK(a1, a0, -0x80, t0, t1, t3, t4) RMOVE_BIGCHUNK(a1, a0, -0x60, t0, t1, t3, t4) RMOVE_BIGCHUNK(a1, a0, -0x40, t0, t1, t3, t4) RMOVE_BIGCHUNK(a1, a0, -0x20, t0, t1, t3, t4) subu t8, t8, 0x01 subu a1, a1, 0x80 bnez t8, r_move_128bytes subu a0, a0, 0x80 0: beqz t2, 1f andi t2, a2, 0x20 r_move_64bytes: subu a1, a1, 0x40 subu a0, a0, 0x40 RMOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) RMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) 1: beqz t2, r_do_end_words andi t8, a2, 0x1c r_move_32bytes: subu a1, a1, 0x20 subu a0, a0, 0x20 RMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) andi t8, a2, 0x1c r_do_end_words: beqz t8, r_maybe_end_cruft srl t8, t8, 0x2 r_end_words: lw t0, -4(a1) subu t8, t8, 0x1 sw t0, -4(a0) subu a1, a1, 0x4 bnez t8, r_end_words subu a0, a0, 0x4 r_maybe_end_cruft: andi t2, a2, 0x3 r_small_memcpy: beqz t2, r_out move a2, t2 #endif /* Horror fix */ r_end_bytes: lb t0, -1(a1) subu a2, a2, 0x1 sb t0, -1(a0) subu a1, a1, 0x1 bnez a2, r_end_bytes subu a0, a0, 0x1 r_out: jr ra move a2, zero #if 0 /* Horror fix */ /* ------------------------------------------------------------------------- */ /* Bad, bad. At least try to align the source */ r_memcpy_u_src: bnez t8, r_small_memcpy # < 8 bytes? move t2, a2 andi t0, a1, 7 # t0: how much to align ulw t1, -8(a1) # dword alignment ulw t2, -4(a1) usw t1, -8(a0) usw t2, -4(a0) subu a1, t0 # src subu a0, t0 # dst subu a2, t0 # len sltiu t8, a2, 56 bnez t8, ru_do_end_words andi t8, a2, 0x3c andi t8, a1, 8 # now qword aligned? ru_qword_align: beqz t8, ru_oword_align andi t8, a1, 0x10 subu a1, a1, 0x8 lw t0, 0x00(a1) lw t1, 0x04(a1) subu a0, a0, 0x8 usw t0, 0x00(a0) usw t1, 0x04(a0) subu a2, a2, 0x8 andi t8, a1, 0x10 ru_oword_align: beqz t8, ru_begin_movement srl t8, a2, 0x7 subu a1, a1, 0x10 lw t3, 0x08(a1) # assumes subblock ordering lw t4, 0x0c(a1) lw t0, 0x00(a1) lw t1, 0x04(a1) subu a0, a0, 0x10 usw t3, 0x08(a0) usw t4, 0x0c(a0) usw t0, 0x00(a0) usw t1, 0x04(a0) subu a2, a2, 0x10 srl t8, a2, 0x7 ru_begin_movement: beqz t8, 0f andi t2, a2, 0x40 ru_move_128bytes: RUMOVE_BIGCHUNK(a1, a0, -0x80, t0, t1, t3, t4) RUMOVE_BIGCHUNK(a1, a0, -0x60, t0, t1, t3, t4) RUMOVE_BIGCHUNK(a1, a0, -0x40, t0, t1, t3, t4) RUMOVE_BIGCHUNK(a1, a0, -0x20, t0, t1, t3, t4) subu t8, t8, 0x01 subu a1, a1, 0x80 bnez t8, ru_move_128bytes subu a0, a0, 0x80 0: beqz t2, 1f andi t2, a2, 0x20 ru_move_64bytes: subu a1, a1, 0x40 subu a0, a0, 0x40 RUMOVE_BIGCHUNK(a1, a0, 0x20, t0, t1, t3, t4) RUMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) 1: beqz t2, ru_do_end_words andi t8, a2, 0x1c ru_move_32bytes: subu a1, a1, 0x20 subu a0, a0, 0x20 RUMOVE_BIGCHUNK(a1, a0, 0x00, t0, t1, t3, t4) andi t8, a2, 0x1c ru_do_end_words: beqz t8, ru_maybe_end_cruft srl t8, t8, 0x2 ru_end_words: lw t0, -4(a1) usw t0, -4(a0) subu t8, t8, 0x1 subu a1, a1, 0x4 bnez t8, ru_end_words subu a0, a0, 0x4 ru_maybe_end_cruft: andi t2, a2, 0x3 ru_cannot_optimize: beqz t2, r_out move a2, t2 ru_end_bytes: lb t0, -1(a1) subu a2, a2, 0x1 sb t0, -1(a0) subu a1, a1, 0x1 bnez a2, ru_end_bytes subu a0, a0, 0x1 jr ra move a2, zero END(__rmemcpy) #endif /* Horror fix */ l_fixup: # clear the rest of the buffer lw t0, THREAD_BUADDR($28) nop subu a2, AT, t0 # a2 bytes to go addu a0, t0 # compute start address in a1 subu a0, a1 j __bzero move a1, zero s_fixup: jr ra nop |