1 //===- RelocationResolver.cpp ------------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines utilities to resolve relocations in object files. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "llvm/Object/RelocationResolver.h" 14 #include "llvm/ADT/Triple.h" 15 #include "llvm/ADT/Twine.h" 16 #include "llvm/BinaryFormat/COFF.h" 17 #include "llvm/BinaryFormat/ELF.h" 18 #include "llvm/BinaryFormat/MachO.h" 19 #include "llvm/BinaryFormat/Wasm.h" 20 #include "llvm/Object/ELFObjectFile.h" 21 #include "llvm/Object/ELFTypes.h" 22 #include "llvm/Object/ObjectFile.h" 23 #include "llvm/Object/SymbolicFile.h" 24 #include "llvm/Support/Casting.h" 25 #include "llvm/Support/Error.h" 26 #include "llvm/Support/ErrorHandling.h" 27 #include <cassert> 28 #include <vector> 29 30 namespace llvm { 31 namespace object { 32 33 static int64_t getELFAddend(RelocationRef R) { 34 Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend(); 35 handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) { 36 report_fatal_error(Twine(EI.message())); 37 }); 38 return *AddendOrErr; 39 } 40 41 static bool supportsX86_64(uint64_t Type) { 42 switch (Type) { 43 case ELF::R_X86_64_NONE: 44 case ELF::R_X86_64_64: 45 case ELF::R_X86_64_DTPOFF32: 46 case ELF::R_X86_64_DTPOFF64: 47 case ELF::R_X86_64_PC32: 48 case ELF::R_X86_64_PC64: 49 case ELF::R_X86_64_32: 50 case ELF::R_X86_64_32S: 51 return true; 52 default: 53 return false; 54 } 55 } 56 57 static uint64_t resolveX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 58 uint64_t LocData, int64_t Addend) { 59 switch (Type) { 60 case ELF::R_X86_64_NONE: 61 return LocData; 62 case ELF::R_X86_64_64: 63 case ELF::R_X86_64_DTPOFF32: 64 case ELF::R_X86_64_DTPOFF64: 65 return S + Addend; 66 case ELF::R_X86_64_PC32: 67 case ELF::R_X86_64_PC64: 68 return S + Addend - Offset; 69 case ELF::R_X86_64_32: 70 case ELF::R_X86_64_32S: 71 return (S + Addend) & 0xFFFFFFFF; 72 default: 73 llvm_unreachable("Invalid relocation type"); 74 } 75 } 76 77 static bool supportsAArch64(uint64_t Type) { 78 switch (Type) { 79 case ELF::R_AARCH64_ABS32: 80 case ELF::R_AARCH64_ABS64: 81 case ELF::R_AARCH64_PREL16: 82 case ELF::R_AARCH64_PREL32: 83 case ELF::R_AARCH64_PREL64: 84 return true; 85 default: 86 return false; 87 } 88 } 89 90 static uint64_t resolveAArch64(uint64_t Type, uint64_t Offset, uint64_t S, 91 uint64_t /*LocData*/, int64_t Addend) { 92 switch (Type) { 93 case ELF::R_AARCH64_ABS32: 94 return (S + Addend) & 0xFFFFFFFF; 95 case ELF::R_AARCH64_ABS64: 96 return S + Addend; 97 case ELF::R_AARCH64_PREL16: 98 return (S + Addend - Offset) & 0xFFFF; 99 case ELF::R_AARCH64_PREL32: 100 return (S + Addend - Offset) & 0xFFFFFFFF; 101 case ELF::R_AARCH64_PREL64: 102 return S + Addend - Offset; 103 default: 104 llvm_unreachable("Invalid relocation type"); 105 } 106 } 107 108 static bool supportsBPF(uint64_t Type) { 109 switch (Type) { 110 case ELF::R_BPF_64_ABS32: 111 case ELF::R_BPF_64_ABS64: 112 return true; 113 default: 114 return false; 115 } 116 } 117 118 static uint64_t resolveBPF(uint64_t Type, uint64_t Offset, uint64_t S, 119 uint64_t LocData, int64_t /*Addend*/) { 120 switch (Type) { 121 case ELF::R_BPF_64_ABS32: 122 return (S + LocData) & 0xFFFFFFFF; 123 case ELF::R_BPF_64_ABS64: 124 return S + LocData; 125 default: 126 llvm_unreachable("Invalid relocation type"); 127 } 128 } 129 130 static bool supportsMips64(uint64_t Type) { 131 switch (Type) { 132 case ELF::R_MIPS_32: 133 case ELF::R_MIPS_64: 134 case ELF::R_MIPS_TLS_DTPREL64: 135 case ELF::R_MIPS_PC32: 136 return true; 137 default: 138 return false; 139 } 140 } 141 142 static uint64_t resolveMips64(uint64_t Type, uint64_t Offset, uint64_t S, 143 uint64_t /*LocData*/, int64_t Addend) { 144 switch (Type) { 145 case ELF::R_MIPS_32: 146 return (S + Addend) & 0xFFFFFFFF; 147 case ELF::R_MIPS_64: 148 return S + Addend; 149 case ELF::R_MIPS_TLS_DTPREL64: 150 return S + Addend - 0x8000; 151 case ELF::R_MIPS_PC32: 152 return S + Addend - Offset; 153 default: 154 llvm_unreachable("Invalid relocation type"); 155 } 156 } 157 158 static bool supportsMSP430(uint64_t Type) { 159 switch (Type) { 160 case ELF::R_MSP430_32: 161 case ELF::R_MSP430_16_BYTE: 162 return true; 163 default: 164 return false; 165 } 166 } 167 168 static uint64_t resolveMSP430(uint64_t Type, uint64_t Offset, uint64_t S, 169 uint64_t /*LocData*/, int64_t Addend) { 170 switch (Type) { 171 case ELF::R_MSP430_32: 172 return (S + Addend) & 0xFFFFFFFF; 173 case ELF::R_MSP430_16_BYTE: 174 return (S + Addend) & 0xFFFF; 175 default: 176 llvm_unreachable("Invalid relocation type"); 177 } 178 } 179 180 static bool supportsPPC64(uint64_t Type) { 181 switch (Type) { 182 case ELF::R_PPC64_ADDR32: 183 case ELF::R_PPC64_ADDR64: 184 case ELF::R_PPC64_REL32: 185 case ELF::R_PPC64_REL64: 186 return true; 187 default: 188 return false; 189 } 190 } 191 192 static uint64_t resolvePPC64(uint64_t Type, uint64_t Offset, uint64_t S, 193 uint64_t /*LocData*/, int64_t Addend) { 194 switch (Type) { 195 case ELF::R_PPC64_ADDR32: 196 return (S + Addend) & 0xFFFFFFFF; 197 case ELF::R_PPC64_ADDR64: 198 return S + Addend; 199 case ELF::R_PPC64_REL32: 200 return (S + Addend - Offset) & 0xFFFFFFFF; 201 case ELF::R_PPC64_REL64: 202 return S + Addend - Offset; 203 default: 204 llvm_unreachable("Invalid relocation type"); 205 } 206 } 207 208 static bool supportsSystemZ(uint64_t Type) { 209 switch (Type) { 210 case ELF::R_390_32: 211 case ELF::R_390_64: 212 return true; 213 default: 214 return false; 215 } 216 } 217 218 static uint64_t resolveSystemZ(uint64_t Type, uint64_t Offset, uint64_t S, 219 uint64_t /*LocData*/, int64_t Addend) { 220 switch (Type) { 221 case ELF::R_390_32: 222 return (S + Addend) & 0xFFFFFFFF; 223 case ELF::R_390_64: 224 return S + Addend; 225 default: 226 llvm_unreachable("Invalid relocation type"); 227 } 228 } 229 230 static bool supportsSparc64(uint64_t Type) { 231 switch (Type) { 232 case ELF::R_SPARC_32: 233 case ELF::R_SPARC_64: 234 case ELF::R_SPARC_UA32: 235 case ELF::R_SPARC_UA64: 236 return true; 237 default: 238 return false; 239 } 240 } 241 242 static uint64_t resolveSparc64(uint64_t Type, uint64_t Offset, uint64_t S, 243 uint64_t /*LocData*/, int64_t Addend) { 244 switch (Type) { 245 case ELF::R_SPARC_32: 246 case ELF::R_SPARC_64: 247 case ELF::R_SPARC_UA32: 248 case ELF::R_SPARC_UA64: 249 return S + Addend; 250 default: 251 llvm_unreachable("Invalid relocation type"); 252 } 253 } 254 255 static bool supportsAmdgpu(uint64_t Type) { 256 switch (Type) { 257 case ELF::R_AMDGPU_ABS32: 258 case ELF::R_AMDGPU_ABS64: 259 return true; 260 default: 261 return false; 262 } 263 } 264 265 static uint64_t resolveAmdgpu(uint64_t Type, uint64_t Offset, uint64_t S, 266 uint64_t /*LocData*/, int64_t Addend) { 267 switch (Type) { 268 case ELF::R_AMDGPU_ABS32: 269 case ELF::R_AMDGPU_ABS64: 270 return S + Addend; 271 default: 272 llvm_unreachable("Invalid relocation type"); 273 } 274 } 275 276 static bool supportsX86(uint64_t Type) { 277 switch (Type) { 278 case ELF::R_386_NONE: 279 case ELF::R_386_32: 280 case ELF::R_386_PC32: 281 return true; 282 default: 283 return false; 284 } 285 } 286 287 static uint64_t resolveX86(uint64_t Type, uint64_t Offset, uint64_t S, 288 uint64_t LocData, int64_t /*Addend*/) { 289 switch (Type) { 290 case ELF::R_386_NONE: 291 return LocData; 292 case ELF::R_386_32: 293 return S + LocData; 294 case ELF::R_386_PC32: 295 return S - Offset + LocData; 296 default: 297 llvm_unreachable("Invalid relocation type"); 298 } 299 } 300 301 static bool supportsPPC32(uint64_t Type) { 302 switch (Type) { 303 case ELF::R_PPC_ADDR32: 304 case ELF::R_PPC_REL32: 305 return true; 306 default: 307 return false; 308 } 309 } 310 311 static uint64_t resolvePPC32(uint64_t Type, uint64_t Offset, uint64_t S, 312 uint64_t /*LocData*/, int64_t Addend) { 313 switch (Type) { 314 case ELF::R_PPC_ADDR32: 315 return (S + Addend) & 0xFFFFFFFF; 316 case ELF::R_PPC_REL32: 317 return (S + Addend - Offset) & 0xFFFFFFFF; 318 } 319 llvm_unreachable("Invalid relocation type"); 320 } 321 322 static bool supportsARM(uint64_t Type) { 323 switch (Type) { 324 case ELF::R_ARM_ABS32: 325 case ELF::R_ARM_REL32: 326 return true; 327 default: 328 return false; 329 } 330 } 331 332 static uint64_t resolveARM(uint64_t Type, uint64_t Offset, uint64_t S, 333 uint64_t LocData, int64_t Addend) { 334 // Support both RELA and REL relocations. The caller is responsible 335 // for supplying the correct values for LocData and Addend, i.e. 336 // Addend == 0 for REL and LocData == 0 for RELA. 337 assert((LocData == 0 || Addend == 0) && 338 "one of LocData and Addend must be 0"); 339 switch (Type) { 340 case ELF::R_ARM_ABS32: 341 return (S + LocData + Addend) & 0xFFFFFFFF; 342 case ELF::R_ARM_REL32: 343 return (S + LocData + Addend - Offset) & 0xFFFFFFFF; 344 } 345 llvm_unreachable("Invalid relocation type"); 346 } 347 348 static bool supportsAVR(uint64_t Type) { 349 switch (Type) { 350 case ELF::R_AVR_16: 351 case ELF::R_AVR_32: 352 return true; 353 default: 354 return false; 355 } 356 } 357 358 static uint64_t resolveAVR(uint64_t Type, uint64_t Offset, uint64_t S, 359 uint64_t /*LocData*/, int64_t Addend) { 360 switch (Type) { 361 case ELF::R_AVR_16: 362 return (S + Addend) & 0xFFFF; 363 case ELF::R_AVR_32: 364 return (S + Addend) & 0xFFFFFFFF; 365 default: 366 llvm_unreachable("Invalid relocation type"); 367 } 368 } 369 370 static bool supportsLanai(uint64_t Type) { 371 return Type == ELF::R_LANAI_32; 372 } 373 374 static uint64_t resolveLanai(uint64_t Type, uint64_t Offset, uint64_t S, 375 uint64_t /*LocData*/, int64_t Addend) { 376 if (Type == ELF::R_LANAI_32) 377 return (S + Addend) & 0xFFFFFFFF; 378 llvm_unreachable("Invalid relocation type"); 379 } 380 381 static bool supportsMips32(uint64_t Type) { 382 switch (Type) { 383 case ELF::R_MIPS_32: 384 case ELF::R_MIPS_TLS_DTPREL32: 385 return true; 386 default: 387 return false; 388 } 389 } 390 391 static uint64_t resolveMips32(uint64_t Type, uint64_t Offset, uint64_t S, 392 uint64_t LocData, int64_t /*Addend*/) { 393 // FIXME: Take in account implicit addends to get correct results. 394 if (Type == ELF::R_MIPS_32) 395 return (S + LocData) & 0xFFFFFFFF; 396 if (Type == ELF::R_MIPS_TLS_DTPREL32) 397 return (S + LocData) & 0xFFFFFFFF; 398 llvm_unreachable("Invalid relocation type"); 399 } 400 401 static bool supportsSparc32(uint64_t Type) { 402 switch (Type) { 403 case ELF::R_SPARC_32: 404 case ELF::R_SPARC_UA32: 405 return true; 406 default: 407 return false; 408 } 409 } 410 411 static uint64_t resolveSparc32(uint64_t Type, uint64_t Offset, uint64_t S, 412 uint64_t LocData, int64_t Addend) { 413 if (Type == ELF::R_SPARC_32 || Type == ELF::R_SPARC_UA32) 414 return S + Addend; 415 return LocData; 416 } 417 418 static bool supportsHexagon(uint64_t Type) { 419 return Type == ELF::R_HEX_32; 420 } 421 422 static uint64_t resolveHexagon(uint64_t Type, uint64_t Offset, uint64_t S, 423 uint64_t /*LocData*/, int64_t Addend) { 424 if (Type == ELF::R_HEX_32) 425 return S + Addend; 426 llvm_unreachable("Invalid relocation type"); 427 } 428 429 static bool supportsRISCV(uint64_t Type) { 430 switch (Type) { 431 case ELF::R_RISCV_NONE: 432 case ELF::R_RISCV_32: 433 case ELF::R_RISCV_32_PCREL: 434 case ELF::R_RISCV_64: 435 case ELF::R_RISCV_SET6: 436 case ELF::R_RISCV_SET8: 437 case ELF::R_RISCV_SUB6: 438 case ELF::R_RISCV_ADD8: 439 case ELF::R_RISCV_SUB8: 440 case ELF::R_RISCV_ADD16: 441 case ELF::R_RISCV_SUB16: 442 case ELF::R_RISCV_ADD32: 443 case ELF::R_RISCV_SUB32: 444 case ELF::R_RISCV_ADD64: 445 case ELF::R_RISCV_SUB64: 446 return true; 447 default: 448 return false; 449 } 450 } 451 452 static uint64_t resolveRISCV(uint64_t Type, uint64_t Offset, uint64_t S, 453 uint64_t LocData, int64_t Addend) { 454 int64_t RA = Addend; 455 uint64_t A = LocData; 456 switch (Type) { 457 case ELF::R_RISCV_NONE: 458 return LocData; 459 case ELF::R_RISCV_32: 460 return (S + RA) & 0xFFFFFFFF; 461 case ELF::R_RISCV_32_PCREL: 462 return (S + RA - Offset) & 0xFFFFFFFF; 463 case ELF::R_RISCV_64: 464 return S + RA; 465 case ELF::R_RISCV_SET6: 466 return (A & 0xC0) | ((S + RA) & 0x3F); 467 case ELF::R_RISCV_SUB6: 468 return (A & 0xC0) | (((A & 0x3F) - (S + RA)) & 0x3F); 469 case ELF::R_RISCV_SET8: 470 return (S + RA) & 0xFF; 471 case ELF::R_RISCV_ADD8: 472 return (A + (S + RA)) & 0xFF; 473 case ELF::R_RISCV_SUB8: 474 return (A - (S + RA)) & 0xFF; 475 case ELF::R_RISCV_ADD16: 476 return (A + (S + RA)) & 0xFFFF; 477 case ELF::R_RISCV_SUB16: 478 return (A - (S + RA)) & 0xFFFF; 479 case ELF::R_RISCV_ADD32: 480 return (A + (S + RA)) & 0xFFFFFFFF; 481 case ELF::R_RISCV_SUB32: 482 return (A - (S + RA)) & 0xFFFFFFFF; 483 case ELF::R_RISCV_ADD64: 484 return (A + (S + RA)); 485 case ELF::R_RISCV_SUB64: 486 return (A - (S + RA)); 487 default: 488 llvm_unreachable("Invalid relocation type"); 489 } 490 } 491 492 static bool supportsCSKY(uint64_t Type) { 493 switch (Type) { 494 case ELF::R_CKCORE_NONE: 495 case ELF::R_CKCORE_ADDR32: 496 case ELF::R_CKCORE_PCREL32: 497 return true; 498 default: 499 return false; 500 } 501 } 502 503 static uint64_t resolveCSKY(uint64_t Type, uint64_t Offset, uint64_t S, 504 uint64_t LocData, int64_t Addend) { 505 switch (Type) { 506 case ELF::R_CKCORE_NONE: 507 return LocData; 508 case ELF::R_CKCORE_ADDR32: 509 return (S + Addend) & 0xFFFFFFFF; 510 case ELF::R_CKCORE_PCREL32: 511 return (S + Addend - Offset) & 0xFFFFFFFF; 512 default: 513 llvm_unreachable("Invalid relocation type"); 514 } 515 } 516 517 static bool supportsLoongArch(uint64_t Type) { 518 switch (Type) { 519 case ELF::R_LARCH_NONE: 520 case ELF::R_LARCH_32: 521 case ELF::R_LARCH_32_PCREL: 522 case ELF::R_LARCH_64: 523 case ELF::R_LARCH_ADD8: 524 case ELF::R_LARCH_SUB8: 525 case ELF::R_LARCH_ADD16: 526 case ELF::R_LARCH_SUB16: 527 case ELF::R_LARCH_ADD32: 528 case ELF::R_LARCH_SUB32: 529 case ELF::R_LARCH_ADD64: 530 case ELF::R_LARCH_SUB64: 531 return true; 532 default: 533 return false; 534 } 535 } 536 537 static uint64_t resolveLoongArch(uint64_t Type, uint64_t Offset, uint64_t S, 538 uint64_t LocData, int64_t Addend) { 539 switch (Type) { 540 case ELF::R_LARCH_NONE: 541 return LocData; 542 case ELF::R_LARCH_32: 543 return (S + Addend) & 0xFFFFFFFF; 544 case ELF::R_LARCH_32_PCREL: 545 return (S + Addend - Offset) & 0xFFFFFFFF; 546 case ELF::R_LARCH_64: 547 return S + Addend; 548 case ELF::R_LARCH_ADD8: 549 return (LocData + (S + Addend)) & 0xFF; 550 case ELF::R_LARCH_SUB8: 551 return (LocData - (S + Addend)) & 0xFF; 552 case ELF::R_LARCH_ADD16: 553 return (LocData + (S + Addend)) & 0xFFFF; 554 case ELF::R_LARCH_SUB16: 555 return (LocData - (S + Addend)) & 0xFFFF; 556 case ELF::R_LARCH_ADD32: 557 return (LocData + (S + Addend)) & 0xFFFFFFFF; 558 case ELF::R_LARCH_SUB32: 559 return (LocData - (S + Addend)) & 0xFFFFFFFF; 560 case ELF::R_LARCH_ADD64: 561 return (LocData + (S + Addend)); 562 case ELF::R_LARCH_SUB64: 563 return (LocData - (S + Addend)); 564 default: 565 llvm_unreachable("Invalid relocation type"); 566 } 567 } 568 569 static bool supportsCOFFX86(uint64_t Type) { 570 switch (Type) { 571 case COFF::IMAGE_REL_I386_SECREL: 572 case COFF::IMAGE_REL_I386_DIR32: 573 return true; 574 default: 575 return false; 576 } 577 } 578 579 static uint64_t resolveCOFFX86(uint64_t Type, uint64_t Offset, uint64_t S, 580 uint64_t LocData, int64_t /*Addend*/) { 581 switch (Type) { 582 case COFF::IMAGE_REL_I386_SECREL: 583 case COFF::IMAGE_REL_I386_DIR32: 584 return (S + LocData) & 0xFFFFFFFF; 585 default: 586 llvm_unreachable("Invalid relocation type"); 587 } 588 } 589 590 static bool supportsCOFFX86_64(uint64_t Type) { 591 switch (Type) { 592 case COFF::IMAGE_REL_AMD64_SECREL: 593 case COFF::IMAGE_REL_AMD64_ADDR64: 594 return true; 595 default: 596 return false; 597 } 598 } 599 600 static uint64_t resolveCOFFX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 601 uint64_t LocData, int64_t /*Addend*/) { 602 switch (Type) { 603 case COFF::IMAGE_REL_AMD64_SECREL: 604 return (S + LocData) & 0xFFFFFFFF; 605 case COFF::IMAGE_REL_AMD64_ADDR64: 606 return S + LocData; 607 default: 608 llvm_unreachable("Invalid relocation type"); 609 } 610 } 611 612 static bool supportsCOFFARM(uint64_t Type) { 613 switch (Type) { 614 case COFF::IMAGE_REL_ARM_SECREL: 615 case COFF::IMAGE_REL_ARM_ADDR32: 616 return true; 617 default: 618 return false; 619 } 620 } 621 622 static uint64_t resolveCOFFARM(uint64_t Type, uint64_t Offset, uint64_t S, 623 uint64_t LocData, int64_t /*Addend*/) { 624 switch (Type) { 625 case COFF::IMAGE_REL_ARM_SECREL: 626 case COFF::IMAGE_REL_ARM_ADDR32: 627 return (S + LocData) & 0xFFFFFFFF; 628 default: 629 llvm_unreachable("Invalid relocation type"); 630 } 631 } 632 633 static bool supportsCOFFARM64(uint64_t Type) { 634 switch (Type) { 635 case COFF::IMAGE_REL_ARM64_SECREL: 636 case COFF::IMAGE_REL_ARM64_ADDR64: 637 return true; 638 default: 639 return false; 640 } 641 } 642 643 static uint64_t resolveCOFFARM64(uint64_t Type, uint64_t Offset, uint64_t S, 644 uint64_t LocData, int64_t /*Addend*/) { 645 switch (Type) { 646 case COFF::IMAGE_REL_ARM64_SECREL: 647 return (S + LocData) & 0xFFFFFFFF; 648 case COFF::IMAGE_REL_ARM64_ADDR64: 649 return S + LocData; 650 default: 651 llvm_unreachable("Invalid relocation type"); 652 } 653 } 654 655 static bool supportsMachOX86_64(uint64_t Type) { 656 return Type == MachO::X86_64_RELOC_UNSIGNED; 657 } 658 659 static uint64_t resolveMachOX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 660 uint64_t LocData, int64_t /*Addend*/) { 661 if (Type == MachO::X86_64_RELOC_UNSIGNED) 662 return S; 663 llvm_unreachable("Invalid relocation type"); 664 } 665 666 static bool supportsWasm32(uint64_t Type) { 667 switch (Type) { 668 case wasm::R_WASM_FUNCTION_INDEX_LEB: 669 case wasm::R_WASM_TABLE_INDEX_SLEB: 670 case wasm::R_WASM_TABLE_INDEX_I32: 671 case wasm::R_WASM_MEMORY_ADDR_LEB: 672 case wasm::R_WASM_MEMORY_ADDR_SLEB: 673 case wasm::R_WASM_MEMORY_ADDR_I32: 674 case wasm::R_WASM_TYPE_INDEX_LEB: 675 case wasm::R_WASM_GLOBAL_INDEX_LEB: 676 case wasm::R_WASM_FUNCTION_OFFSET_I32: 677 case wasm::R_WASM_SECTION_OFFSET_I32: 678 case wasm::R_WASM_TAG_INDEX_LEB: 679 case wasm::R_WASM_GLOBAL_INDEX_I32: 680 case wasm::R_WASM_TABLE_NUMBER_LEB: 681 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 682 return true; 683 default: 684 return false; 685 } 686 } 687 688 static bool supportsWasm64(uint64_t Type) { 689 switch (Type) { 690 case wasm::R_WASM_MEMORY_ADDR_LEB64: 691 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 692 case wasm::R_WASM_MEMORY_ADDR_I64: 693 case wasm::R_WASM_TABLE_INDEX_SLEB64: 694 case wasm::R_WASM_TABLE_INDEX_I64: 695 case wasm::R_WASM_FUNCTION_OFFSET_I64: 696 return true; 697 default: 698 return supportsWasm32(Type); 699 } 700 } 701 702 static uint64_t resolveWasm32(uint64_t Type, uint64_t Offset, uint64_t S, 703 uint64_t LocData, int64_t /*Addend*/) { 704 switch (Type) { 705 case wasm::R_WASM_FUNCTION_INDEX_LEB: 706 case wasm::R_WASM_TABLE_INDEX_SLEB: 707 case wasm::R_WASM_TABLE_INDEX_I32: 708 case wasm::R_WASM_MEMORY_ADDR_LEB: 709 case wasm::R_WASM_MEMORY_ADDR_SLEB: 710 case wasm::R_WASM_MEMORY_ADDR_I32: 711 case wasm::R_WASM_TYPE_INDEX_LEB: 712 case wasm::R_WASM_GLOBAL_INDEX_LEB: 713 case wasm::R_WASM_FUNCTION_OFFSET_I32: 714 case wasm::R_WASM_SECTION_OFFSET_I32: 715 case wasm::R_WASM_TAG_INDEX_LEB: 716 case wasm::R_WASM_GLOBAL_INDEX_I32: 717 case wasm::R_WASM_TABLE_NUMBER_LEB: 718 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 719 // For wasm section, its offset at 0 -- ignoring Value 720 return LocData; 721 default: 722 llvm_unreachable("Invalid relocation type"); 723 } 724 } 725 726 static uint64_t resolveWasm64(uint64_t Type, uint64_t Offset, uint64_t S, 727 uint64_t LocData, int64_t Addend) { 728 switch (Type) { 729 case wasm::R_WASM_MEMORY_ADDR_LEB64: 730 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 731 case wasm::R_WASM_MEMORY_ADDR_I64: 732 case wasm::R_WASM_TABLE_INDEX_SLEB64: 733 case wasm::R_WASM_TABLE_INDEX_I64: 734 case wasm::R_WASM_FUNCTION_OFFSET_I64: 735 // For wasm section, its offset at 0 -- ignoring Value 736 return LocData; 737 default: 738 return resolveWasm32(Type, Offset, S, LocData, Addend); 739 } 740 } 741 742 std::pair<SupportsRelocation, RelocationResolver> 743 getRelocationResolver(const ObjectFile &Obj) { 744 if (Obj.isCOFF()) { 745 switch (Obj.getArch()) { 746 case Triple::x86_64: 747 return {supportsCOFFX86_64, resolveCOFFX86_64}; 748 case Triple::x86: 749 return {supportsCOFFX86, resolveCOFFX86}; 750 case Triple::arm: 751 case Triple::thumb: 752 return {supportsCOFFARM, resolveCOFFARM}; 753 case Triple::aarch64: 754 return {supportsCOFFARM64, resolveCOFFARM64}; 755 default: 756 return {nullptr, nullptr}; 757 } 758 } else if (Obj.isELF()) { 759 if (Obj.getBytesInAddress() == 8) { 760 switch (Obj.getArch()) { 761 case Triple::x86_64: 762 return {supportsX86_64, resolveX86_64}; 763 case Triple::aarch64: 764 case Triple::aarch64_be: 765 return {supportsAArch64, resolveAArch64}; 766 case Triple::bpfel: 767 case Triple::bpfeb: 768 return {supportsBPF, resolveBPF}; 769 case Triple::loongarch64: 770 return {supportsLoongArch, resolveLoongArch}; 771 case Triple::mips64el: 772 case Triple::mips64: 773 return {supportsMips64, resolveMips64}; 774 case Triple::ppc64le: 775 case Triple::ppc64: 776 return {supportsPPC64, resolvePPC64}; 777 case Triple::systemz: 778 return {supportsSystemZ, resolveSystemZ}; 779 case Triple::sparcv9: 780 return {supportsSparc64, resolveSparc64}; 781 case Triple::amdgcn: 782 return {supportsAmdgpu, resolveAmdgpu}; 783 case Triple::riscv64: 784 return {supportsRISCV, resolveRISCV}; 785 default: 786 return {nullptr, nullptr}; 787 } 788 } 789 790 // 32-bit object file 791 assert(Obj.getBytesInAddress() == 4 && 792 "Invalid word size in object file"); 793 794 switch (Obj.getArch()) { 795 case Triple::x86: 796 return {supportsX86, resolveX86}; 797 case Triple::ppcle: 798 case Triple::ppc: 799 return {supportsPPC32, resolvePPC32}; 800 case Triple::arm: 801 case Triple::armeb: 802 return {supportsARM, resolveARM}; 803 case Triple::avr: 804 return {supportsAVR, resolveAVR}; 805 case Triple::lanai: 806 return {supportsLanai, resolveLanai}; 807 case Triple::loongarch32: 808 return {supportsLoongArch, resolveLoongArch}; 809 case Triple::mipsel: 810 case Triple::mips: 811 return {supportsMips32, resolveMips32}; 812 case Triple::msp430: 813 return {supportsMSP430, resolveMSP430}; 814 case Triple::sparc: 815 return {supportsSparc32, resolveSparc32}; 816 case Triple::hexagon: 817 return {supportsHexagon, resolveHexagon}; 818 case Triple::riscv32: 819 return {supportsRISCV, resolveRISCV}; 820 case Triple::csky: 821 return {supportsCSKY, resolveCSKY}; 822 default: 823 return {nullptr, nullptr}; 824 } 825 } else if (Obj.isMachO()) { 826 if (Obj.getArch() == Triple::x86_64) 827 return {supportsMachOX86_64, resolveMachOX86_64}; 828 return {nullptr, nullptr}; 829 } else if (Obj.isWasm()) { 830 if (Obj.getArch() == Triple::wasm32) 831 return {supportsWasm32, resolveWasm32}; 832 if (Obj.getArch() == Triple::wasm64) 833 return {supportsWasm64, resolveWasm64}; 834 return {nullptr, nullptr}; 835 } 836 837 llvm_unreachable("Invalid object file"); 838 } 839 840 uint64_t resolveRelocation(RelocationResolver Resolver, const RelocationRef &R, 841 uint64_t S, uint64_t LocData) { 842 if (const ObjectFile *Obj = R.getObject()) { 843 int64_t Addend = 0; 844 if (Obj->isELF()) { 845 auto GetRelSectionType = [&]() -> unsigned { 846 if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj)) 847 return Elf32LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 848 if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj)) 849 return Elf64LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 850 if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj)) 851 return Elf32BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 852 auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj); 853 return Elf64BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 854 }; 855 856 if (GetRelSectionType() == ELF::SHT_RELA) { 857 Addend = getELFAddend(R); 858 // RISCV relocations use both LocData and Addend. 859 if (Obj->getArch() != Triple::riscv32 && 860 Obj->getArch() != Triple::riscv64) 861 LocData = 0; 862 } 863 } 864 865 return Resolver(R.getType(), R.getOffset(), S, LocData, Addend); 866 } 867 868 // Sometimes the caller might want to use its own specific implementation of 869 // the resolver function. E.g. this is used by LLD when it resolves debug 870 // relocations and assumes that all of them have the same computation (S + A). 871 // The relocation R has no owner object in this case and we don't need to 872 // provide Type and Offset fields. It is also assumed the DataRefImpl.p 873 // contains the addend, provided by the caller. 874 return Resolver(/*Type=*/0, /*Offset=*/0, S, LocData, 875 R.getRawDataRefImpl().p); 876 } 877 878 } // namespace object 879 } // namespace llvm 880