Loading...
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 | /* SPDX-License-Identifier: LGPL-2.1 OR MIT */ /* * rseq-arm.h * * (C) Copyright 2016-2018 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> */ /* * - ARM little endian * * RSEQ_SIG uses the udf A32 instruction with an uncommon immediate operand * value 0x5de3. This traps if user-space reaches this instruction by mistake, * and the uncommon operand ensures the kernel does not move the instruction * pointer to attacker-controlled code on rseq abort. * * The instruction pattern in the A32 instruction set is: * * e7f5def3 udf #24035 ; 0x5de3 * * This translates to the following instruction pattern in the T16 instruction * set: * * little endian: * def3 udf #243 ; 0xf3 * e7f5 b.n <7f5> * * - ARMv6+ big endian (BE8): * * ARMv6+ -mbig-endian generates mixed endianness code vs data: little-endian * code and big-endian data. The data value of the signature needs to have its * byte order reversed to generate the trap instruction: * * Data: 0xf3def5e7 * * Translates to this A32 instruction pattern: * * e7f5def3 udf #24035 ; 0x5de3 * * Translates to this T16 instruction pattern: * * def3 udf #243 ; 0xf3 * e7f5 b.n <7f5> * * - Prior to ARMv6 big endian (BE32): * * Prior to ARMv6, -mbig-endian generates big-endian code and data * (which match), so the endianness of the data representation of the * signature should not be reversed. However, the choice between BE32 * and BE8 is done by the linker, so we cannot know whether code and * data endianness will be mixed before the linker is invoked. So rather * than try to play tricks with the linker, the rseq signature is simply * data (not a trap instruction) prior to ARMv6 on big endian. This is * why the signature is expressed as data (.word) rather than as * instruction (.inst) in assembler. */ #ifdef __ARMEB__ #define RSEQ_SIG 0xf3def5e7 /* udf #24035 ; 0x5de3 (ARMv6+) */ #else #define RSEQ_SIG 0xe7f5def3 /* udf #24035 ; 0x5de3 */ #endif #define rseq_smp_mb() __asm__ __volatile__ ("dmb" ::: "memory", "cc") #define rseq_smp_rmb() __asm__ __volatile__ ("dmb" ::: "memory", "cc") #define rseq_smp_wmb() __asm__ __volatile__ ("dmb" ::: "memory", "cc") #define rseq_smp_load_acquire(p) \ __extension__ ({ \ __typeof(*p) ____p1 = RSEQ_READ_ONCE(*p); \ rseq_smp_mb(); \ ____p1; \ }) #define rseq_smp_acquire__after_ctrl_dep() rseq_smp_rmb() #define rseq_smp_store_release(p, v) \ do { \ rseq_smp_mb(); \ RSEQ_WRITE_ONCE(*p, v); \ } while (0) #ifdef RSEQ_SKIP_FASTPATH #include "rseq-skip.h" #else /* !RSEQ_SKIP_FASTPATH */ #define __RSEQ_ASM_DEFINE_TABLE(label, version, flags, start_ip, \ post_commit_offset, abort_ip) \ ".pushsection __rseq_cs, \"aw\"\n\t" \ ".balign 32\n\t" \ __rseq_str(label) ":\n\t" \ ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \ ".popsection\n\t" \ ".pushsection __rseq_cs_ptr_array, \"aw\"\n\t" \ ".word " __rseq_str(label) "b, 0x0\n\t" \ ".popsection\n\t" #define RSEQ_ASM_DEFINE_TABLE(label, start_ip, post_commit_ip, abort_ip) \ __RSEQ_ASM_DEFINE_TABLE(label, 0x0, 0x0, start_ip, \ (post_commit_ip - start_ip), abort_ip) /* * Exit points of a rseq critical section consist of all instructions outside * of the critical section where a critical section can either branch to or * reach through the normal course of its execution. The abort IP and the * post-commit IP are already part of the __rseq_cs section and should not be * explicitly defined as additional exit points. Knowing all exit points is * useful to assist debuggers stepping over the critical section. */ #define RSEQ_ASM_DEFINE_EXIT_POINT(start_ip, exit_ip) \ ".pushsection __rseq_exit_point_array, \"aw\"\n\t" \ ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(exit_ip) ", 0x0\n\t" \ ".popsection\n\t" #define RSEQ_ASM_STORE_RSEQ_CS(label, cs_label, rseq_cs) \ RSEQ_INJECT_ASM(1) \ "adr r0, " __rseq_str(cs_label) "\n\t" \ "str r0, %[" __rseq_str(rseq_cs) "]\n\t" \ __rseq_str(label) ":\n\t" #define RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, label) \ RSEQ_INJECT_ASM(2) \ "ldr r0, %[" __rseq_str(current_cpu_id) "]\n\t" \ "cmp %[" __rseq_str(cpu_id) "], r0\n\t" \ "bne " __rseq_str(label) "\n\t" #define __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \ abort_label, version, flags, \ start_ip, post_commit_offset, abort_ip) \ ".balign 32\n\t" \ __rseq_str(table_label) ":\n\t" \ ".word " __rseq_str(version) ", " __rseq_str(flags) "\n\t" \ ".word " __rseq_str(start_ip) ", 0x0, " __rseq_str(post_commit_offset) ", 0x0, " __rseq_str(abort_ip) ", 0x0\n\t" \ ".word " __rseq_str(RSEQ_SIG) "\n\t" \ __rseq_str(label) ":\n\t" \ teardown \ "b %l[" __rseq_str(abort_label) "]\n\t" #define RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, abort_label, \ start_ip, post_commit_ip, abort_ip) \ __RSEQ_ASM_DEFINE_ABORT(table_label, label, teardown, \ abort_label, 0x0, 0x0, start_ip, \ (post_commit_ip - start_ip), abort_ip) #define RSEQ_ASM_DEFINE_CMPFAIL(label, teardown, cmpfail_label) \ __rseq_str(label) ":\n\t" \ teardown \ "b %l[" __rseq_str(cmpfail_label) "]\n\t" static inline __attribute__((always_inline)) int rseq_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[cmpfail]\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[error2]\n\t" #endif /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(5) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpnev_storeoffp_load(intptr_t *v, intptr_t expectnot, long voffp, intptr_t *load, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expectnot], r0\n\t" "beq %l[cmpfail]\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) "ldr r0, %[v]\n\t" "cmp %[expectnot], r0\n\t" "beq %l[error2]\n\t" #endif "str r0, %[load]\n\t" "add r0, %[voffp]\n\t" "ldr r0, [r0]\n\t" /* final store */ "str r0, %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(5) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* final store input */ [v] "m" (*v), [expectnot] "r" (expectnot), [voffp] "Ir" (voffp), [load] "m" (*load) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_addv(intptr_t *v, intptr_t count, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) #endif "ldr r0, %[v]\n\t" "add r0, %[count]\n\t" /* final store */ "str r0, %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(4) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), [v] "m" (*v), [count] "Ir" (count) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort #ifdef RSEQ_COMPARE_TWICE , error1 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trystorev_storev(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t newv2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[cmpfail]\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[error2]\n\t" #endif /* try store */ "str %[newv2], %[v2]\n\t" RSEQ_INJECT_ASM(5) /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(6) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* try store input */ [v2] "m" (*v2), [newv2] "r" (newv2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trystorev_storev_release(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t newv2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[cmpfail]\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[error2]\n\t" #endif /* try store */ "str %[newv2], %[v2]\n\t" RSEQ_INJECT_ASM(5) "dmb\n\t" /* full mb provides store-release */ /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(6) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* try store input */ [v2] "m" (*v2), [newv2] "r" (newv2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_cmpeqv_storev(intptr_t *v, intptr_t expect, intptr_t *v2, intptr_t expect2, intptr_t newv, int cpu) { RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error3]) #endif /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[cmpfail]\n\t" RSEQ_INJECT_ASM(4) "ldr r0, %[v2]\n\t" "cmp %[expect2], r0\n\t" "bne %l[cmpfail]\n\t" RSEQ_INJECT_ASM(5) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, %l[error1]) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne %l[error2]\n\t" "ldr r0, %[v2]\n\t" "cmp %[expect2], r0\n\t" "bne %l[error3]\n\t" #endif /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(6) "b 5f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, "", abort, 1b, 2b, 4f) "5:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* cmp2 input */ [v2] "m" (*v2), [expect2] "r" (expect2), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2, error3 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("1st expected value comparison failed"); error3: rseq_after_asm_goto(); rseq_bug("2nd expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trymemcpy_storev(intptr_t *v, intptr_t expect, void *dst, void *src, size_t len, intptr_t newv, int cpu) { uint32_t rseq_scratch[3]; RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif "str %[src], %[rseq_scratch0]\n\t" "str %[dst], %[rseq_scratch1]\n\t" "str %[len], %[rseq_scratch2]\n\t" /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne 5f\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne 7f\n\t" #endif /* try memcpy */ "cmp %[len], #0\n\t" \ "beq 333f\n\t" \ "222:\n\t" \ "ldrb %%r0, [%[src]]\n\t" \ "strb %%r0, [%[dst]]\n\t" \ "adds %[src], #1\n\t" \ "adds %[dst], #1\n\t" \ "subs %[len], #1\n\t" \ "bne 222b\n\t" \ "333:\n\t" \ RSEQ_INJECT_ASM(5) /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(6) /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t" "b 8f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", abort, 1b, 2b, 4f) RSEQ_ASM_DEFINE_CMPFAIL(5, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", cmpfail) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_CMPFAIL(6, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", error1) RSEQ_ASM_DEFINE_CMPFAIL(7, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", error2) #endif "8:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv), /* try memcpy input */ [dst] "r" (dst), [src] "r" (src), [len] "r" (len), [rseq_scratch0] "m" (rseq_scratch[0]), [rseq_scratch1] "m" (rseq_scratch[1]), [rseq_scratch2] "m" (rseq_scratch[2]) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } static inline __attribute__((always_inline)) int rseq_cmpeqv_trymemcpy_storev_release(intptr_t *v, intptr_t expect, void *dst, void *src, size_t len, intptr_t newv, int cpu) { uint32_t rseq_scratch[3]; RSEQ_INJECT_C(9) __asm__ __volatile__ goto ( RSEQ_ASM_DEFINE_TABLE(9, 1f, 2f, 4f) /* start, commit, abort */ RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[cmpfail]) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error1]) RSEQ_ASM_DEFINE_EXIT_POINT(1f, %l[error2]) #endif "str %[src], %[rseq_scratch0]\n\t" "str %[dst], %[rseq_scratch1]\n\t" "str %[len], %[rseq_scratch2]\n\t" /* Start rseq by storing table entry pointer into rseq_cs. */ RSEQ_ASM_STORE_RSEQ_CS(1, 3f, rseq_cs) RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 4f) RSEQ_INJECT_ASM(3) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne 5f\n\t" RSEQ_INJECT_ASM(4) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_CMP_CPU_ID(cpu_id, current_cpu_id, 6f) "ldr r0, %[v]\n\t" "cmp %[expect], r0\n\t" "bne 7f\n\t" #endif /* try memcpy */ "cmp %[len], #0\n\t" \ "beq 333f\n\t" \ "222:\n\t" \ "ldrb %%r0, [%[src]]\n\t" \ "strb %%r0, [%[dst]]\n\t" \ "adds %[src], #1\n\t" \ "adds %[dst], #1\n\t" \ "subs %[len], #1\n\t" \ "bne 222b\n\t" \ "333:\n\t" \ RSEQ_INJECT_ASM(5) "dmb\n\t" /* full mb provides store-release */ /* final store */ "str %[newv], %[v]\n\t" "2:\n\t" RSEQ_INJECT_ASM(6) /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t" "b 8f\n\t" RSEQ_ASM_DEFINE_ABORT(3, 4, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", abort, 1b, 2b, 4f) RSEQ_ASM_DEFINE_CMPFAIL(5, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", cmpfail) #ifdef RSEQ_COMPARE_TWICE RSEQ_ASM_DEFINE_CMPFAIL(6, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", error1) RSEQ_ASM_DEFINE_CMPFAIL(7, /* teardown */ "ldr %[len], %[rseq_scratch2]\n\t" "ldr %[dst], %[rseq_scratch1]\n\t" "ldr %[src], %[rseq_scratch0]\n\t", error2) #endif "8:\n\t" : /* gcc asm goto does not allow outputs */ : [cpu_id] "r" (cpu), [current_cpu_id] "m" (rseq_get_abi()->cpu_id), [rseq_cs] "m" (rseq_get_abi()->rseq_cs.arch.ptr), /* final store input */ [v] "m" (*v), [expect] "r" (expect), [newv] "r" (newv), /* try memcpy input */ [dst] "r" (dst), [src] "r" (src), [len] "r" (len), [rseq_scratch0] "m" (rseq_scratch[0]), [rseq_scratch1] "m" (rseq_scratch[1]), [rseq_scratch2] "m" (rseq_scratch[2]) RSEQ_INJECT_INPUT : "r0", "memory", "cc" RSEQ_INJECT_CLOBBER : abort, cmpfail #ifdef RSEQ_COMPARE_TWICE , error1, error2 #endif ); rseq_after_asm_goto(); return 0; abort: rseq_after_asm_goto(); RSEQ_INJECT_FAILED return -1; cmpfail: rseq_after_asm_goto(); return 1; #ifdef RSEQ_COMPARE_TWICE error1: rseq_after_asm_goto(); rseq_bug("cpu_id comparison failed"); error2: rseq_after_asm_goto(); rseq_bug("expected value comparison failed"); #endif } #endif /* !RSEQ_SKIP_FASTPATH */ |