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/Twine.h" 15 #include "llvm/BinaryFormat/COFF.h" 16 #include "llvm/BinaryFormat/ELF.h" 17 #include "llvm/BinaryFormat/MachO.h" 18 #include "llvm/BinaryFormat/Wasm.h" 19 #include "llvm/Object/ELFObjectFile.h" 20 #include "llvm/Object/ELFTypes.h" 21 #include "llvm/Object/ObjectFile.h" 22 #include "llvm/Object/SymbolicFile.h" 23 #include "llvm/Support/Casting.h" 24 #include "llvm/Support/Error.h" 25 #include "llvm/Support/ErrorHandling.h" 26 #include "llvm/TargetParser/Triple.h" 27 #include <cassert> 28 29 namespace llvm { 30 namespace object { 31 32 static int64_t getELFAddend(RelocationRef R) { 33 Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend(); 34 handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) { 35 report_fatal_error(Twine(EI.message())); 36 }); 37 return *AddendOrErr; 38 } 39 40 static bool supportsX86_64(uint64_t Type) { 41 switch (Type) { 42 case ELF::R_X86_64_NONE: 43 case ELF::R_X86_64_64: 44 case ELF::R_X86_64_DTPOFF32: 45 case ELF::R_X86_64_DTPOFF64: 46 case ELF::R_X86_64_PC32: 47 case ELF::R_X86_64_PC64: 48 case ELF::R_X86_64_32: 49 case ELF::R_X86_64_32S: 50 return true; 51 default: 52 return false; 53 } 54 } 55 56 static uint64_t resolveX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 57 uint64_t LocData, int64_t Addend) { 58 switch (Type) { 59 case ELF::R_X86_64_NONE: 60 return LocData; 61 case ELF::R_X86_64_64: 62 case ELF::R_X86_64_DTPOFF32: 63 case ELF::R_X86_64_DTPOFF64: 64 return S + Addend; 65 case ELF::R_X86_64_PC32: 66 case ELF::R_X86_64_PC64: 67 return S + Addend - Offset; 68 case ELF::R_X86_64_32: 69 case ELF::R_X86_64_32S: 70 return (S + Addend) & 0xFFFFFFFF; 71 default: 72 llvm_unreachable("Invalid relocation type"); 73 } 74 } 75 76 static bool supportsAArch64(uint64_t Type) { 77 switch (Type) { 78 case ELF::R_AARCH64_ABS32: 79 case ELF::R_AARCH64_ABS64: 80 case ELF::R_AARCH64_PREL16: 81 case ELF::R_AARCH64_PREL32: 82 case ELF::R_AARCH64_PREL64: 83 return true; 84 default: 85 return false; 86 } 87 } 88 89 static uint64_t resolveAArch64(uint64_t Type, uint64_t Offset, uint64_t S, 90 uint64_t /*LocData*/, int64_t Addend) { 91 switch (Type) { 92 case ELF::R_AARCH64_ABS32: 93 return (S + Addend) & 0xFFFFFFFF; 94 case ELF::R_AARCH64_ABS64: 95 return S + Addend; 96 case ELF::R_AARCH64_PREL16: 97 return (S + Addend - Offset) & 0xFFFF; 98 case ELF::R_AARCH64_PREL32: 99 return (S + Addend - Offset) & 0xFFFFFFFF; 100 case ELF::R_AARCH64_PREL64: 101 return S + Addend - Offset; 102 default: 103 llvm_unreachable("Invalid relocation type"); 104 } 105 } 106 107 static bool supportsBPF(uint64_t Type) { 108 switch (Type) { 109 case ELF::R_BPF_64_ABS32: 110 case ELF::R_BPF_64_ABS64: 111 return true; 112 default: 113 return false; 114 } 115 } 116 117 static uint64_t resolveBPF(uint64_t Type, uint64_t Offset, uint64_t S, 118 uint64_t LocData, int64_t /*Addend*/) { 119 switch (Type) { 120 case ELF::R_BPF_64_ABS32: 121 return (S + LocData) & 0xFFFFFFFF; 122 case ELF::R_BPF_64_ABS64: 123 return S + LocData; 124 default: 125 llvm_unreachable("Invalid relocation type"); 126 } 127 } 128 129 static bool supportsMips64(uint64_t Type) { 130 switch (Type) { 131 case ELF::R_MIPS_32: 132 case ELF::R_MIPS_64: 133 case ELF::R_MIPS_TLS_DTPREL64: 134 case ELF::R_MIPS_PC32: 135 return true; 136 default: 137 return false; 138 } 139 } 140 141 static uint64_t resolveMips64(uint64_t Type, uint64_t Offset, uint64_t S, 142 uint64_t /*LocData*/, int64_t Addend) { 143 switch (Type) { 144 case ELF::R_MIPS_32: 145 return (S + Addend) & 0xFFFFFFFF; 146 case ELF::R_MIPS_64: 147 return S + Addend; 148 case ELF::R_MIPS_TLS_DTPREL64: 149 return S + Addend - 0x8000; 150 case ELF::R_MIPS_PC32: 151 return S + Addend - Offset; 152 default: 153 llvm_unreachable("Invalid relocation type"); 154 } 155 } 156 157 static bool supportsMSP430(uint64_t Type) { 158 switch (Type) { 159 case ELF::R_MSP430_32: 160 case ELF::R_MSP430_16_BYTE: 161 return true; 162 default: 163 return false; 164 } 165 } 166 167 static uint64_t resolveMSP430(uint64_t Type, uint64_t Offset, uint64_t S, 168 uint64_t /*LocData*/, int64_t Addend) { 169 switch (Type) { 170 case ELF::R_MSP430_32: 171 return (S + Addend) & 0xFFFFFFFF; 172 case ELF::R_MSP430_16_BYTE: 173 return (S + Addend) & 0xFFFF; 174 default: 175 llvm_unreachable("Invalid relocation type"); 176 } 177 } 178 179 static bool supportsPPC64(uint64_t Type) { 180 switch (Type) { 181 case ELF::R_PPC64_ADDR32: 182 case ELF::R_PPC64_ADDR64: 183 case ELF::R_PPC64_REL32: 184 case ELF::R_PPC64_REL64: 185 return true; 186 default: 187 return false; 188 } 189 } 190 191 static uint64_t resolvePPC64(uint64_t Type, uint64_t Offset, uint64_t S, 192 uint64_t /*LocData*/, int64_t Addend) { 193 switch (Type) { 194 case ELF::R_PPC64_ADDR32: 195 return (S + Addend) & 0xFFFFFFFF; 196 case ELF::R_PPC64_ADDR64: 197 return S + Addend; 198 case ELF::R_PPC64_REL32: 199 return (S + Addend - Offset) & 0xFFFFFFFF; 200 case ELF::R_PPC64_REL64: 201 return S + Addend - Offset; 202 default: 203 llvm_unreachable("Invalid relocation type"); 204 } 205 } 206 207 static bool supportsSystemZ(uint64_t Type) { 208 switch (Type) { 209 case ELF::R_390_32: 210 case ELF::R_390_64: 211 return true; 212 default: 213 return false; 214 } 215 } 216 217 static uint64_t resolveSystemZ(uint64_t Type, uint64_t Offset, uint64_t S, 218 uint64_t /*LocData*/, int64_t Addend) { 219 switch (Type) { 220 case ELF::R_390_32: 221 return (S + Addend) & 0xFFFFFFFF; 222 case ELF::R_390_64: 223 return S + Addend; 224 default: 225 llvm_unreachable("Invalid relocation type"); 226 } 227 } 228 229 static bool supportsSparc64(uint64_t Type) { 230 switch (Type) { 231 case ELF::R_SPARC_32: 232 case ELF::R_SPARC_64: 233 case ELF::R_SPARC_UA32: 234 case ELF::R_SPARC_UA64: 235 return true; 236 default: 237 return false; 238 } 239 } 240 241 static uint64_t resolveSparc64(uint64_t Type, uint64_t Offset, uint64_t S, 242 uint64_t /*LocData*/, int64_t Addend) { 243 switch (Type) { 244 case ELF::R_SPARC_32: 245 case ELF::R_SPARC_64: 246 case ELF::R_SPARC_UA32: 247 case ELF::R_SPARC_UA64: 248 return S + Addend; 249 default: 250 llvm_unreachable("Invalid relocation type"); 251 } 252 } 253 254 /// Returns true if \c Obj is an AMDGPU code object based solely on the value 255 /// of e_machine. 256 /// 257 /// AMDGPU code objects with an e_machine of EF_AMDGPU_MACH_NONE do not 258 /// identify their arch as either r600 or amdgcn, but we can still handle 259 /// their relocations. When we identify an ELF object with an UnknownArch, 260 /// we use isAMDGPU to check for this case. 261 static bool isAMDGPU(const ObjectFile &Obj) { 262 if (const auto *ELFObj = dyn_cast<ELFObjectFileBase>(&Obj)) 263 return ELFObj->getEMachine() == ELF::EM_AMDGPU; 264 return false; 265 } 266 267 static bool supportsAmdgpu(uint64_t Type) { 268 switch (Type) { 269 case ELF::R_AMDGPU_ABS32: 270 case ELF::R_AMDGPU_ABS64: 271 return true; 272 default: 273 return false; 274 } 275 } 276 277 static uint64_t resolveAmdgpu(uint64_t Type, uint64_t Offset, uint64_t S, 278 uint64_t /*LocData*/, int64_t Addend) { 279 switch (Type) { 280 case ELF::R_AMDGPU_ABS32: 281 case ELF::R_AMDGPU_ABS64: 282 return S + Addend; 283 default: 284 llvm_unreachable("Invalid relocation type"); 285 } 286 } 287 288 static bool supportsX86(uint64_t Type) { 289 switch (Type) { 290 case ELF::R_386_NONE: 291 case ELF::R_386_32: 292 case ELF::R_386_PC32: 293 return true; 294 default: 295 return false; 296 } 297 } 298 299 static uint64_t resolveX86(uint64_t Type, uint64_t Offset, uint64_t S, 300 uint64_t LocData, int64_t /*Addend*/) { 301 switch (Type) { 302 case ELF::R_386_NONE: 303 return LocData; 304 case ELF::R_386_32: 305 return S + LocData; 306 case ELF::R_386_PC32: 307 return S - Offset + LocData; 308 default: 309 llvm_unreachable("Invalid relocation type"); 310 } 311 } 312 313 static bool supportsPPC32(uint64_t Type) { 314 switch (Type) { 315 case ELF::R_PPC_ADDR32: 316 case ELF::R_PPC_REL32: 317 return true; 318 default: 319 return false; 320 } 321 } 322 323 static uint64_t resolvePPC32(uint64_t Type, uint64_t Offset, uint64_t S, 324 uint64_t /*LocData*/, int64_t Addend) { 325 switch (Type) { 326 case ELF::R_PPC_ADDR32: 327 return (S + Addend) & 0xFFFFFFFF; 328 case ELF::R_PPC_REL32: 329 return (S + Addend - Offset) & 0xFFFFFFFF; 330 } 331 llvm_unreachable("Invalid relocation type"); 332 } 333 334 static bool supportsARM(uint64_t Type) { 335 switch (Type) { 336 case ELF::R_ARM_ABS32: 337 case ELF::R_ARM_REL32: 338 return true; 339 default: 340 return false; 341 } 342 } 343 344 static uint64_t resolveARM(uint64_t Type, uint64_t Offset, uint64_t S, 345 uint64_t LocData, int64_t Addend) { 346 // Support both RELA and REL relocations. The caller is responsible 347 // for supplying the correct values for LocData and Addend, i.e. 348 // Addend == 0 for REL and LocData == 0 for RELA. 349 assert((LocData == 0 || Addend == 0) && 350 "one of LocData and Addend must be 0"); 351 switch (Type) { 352 case ELF::R_ARM_ABS32: 353 return (S + LocData + Addend) & 0xFFFFFFFF; 354 case ELF::R_ARM_REL32: 355 return (S + LocData + Addend - Offset) & 0xFFFFFFFF; 356 } 357 llvm_unreachable("Invalid relocation type"); 358 } 359 360 static bool supportsAVR(uint64_t Type) { 361 switch (Type) { 362 case ELF::R_AVR_16: 363 case ELF::R_AVR_32: 364 return true; 365 default: 366 return false; 367 } 368 } 369 370 static uint64_t resolveAVR(uint64_t Type, uint64_t Offset, uint64_t S, 371 uint64_t /*LocData*/, int64_t Addend) { 372 switch (Type) { 373 case ELF::R_AVR_16: 374 return (S + Addend) & 0xFFFF; 375 case ELF::R_AVR_32: 376 return (S + Addend) & 0xFFFFFFFF; 377 default: 378 llvm_unreachable("Invalid relocation type"); 379 } 380 } 381 382 static bool supportsLanai(uint64_t Type) { 383 return Type == ELF::R_LANAI_32; 384 } 385 386 static uint64_t resolveLanai(uint64_t Type, uint64_t Offset, uint64_t S, 387 uint64_t /*LocData*/, int64_t Addend) { 388 if (Type == ELF::R_LANAI_32) 389 return (S + Addend) & 0xFFFFFFFF; 390 llvm_unreachable("Invalid relocation type"); 391 } 392 393 static bool supportsMips32(uint64_t Type) { 394 switch (Type) { 395 case ELF::R_MIPS_32: 396 case ELF::R_MIPS_TLS_DTPREL32: 397 return true; 398 default: 399 return false; 400 } 401 } 402 403 static uint64_t resolveMips32(uint64_t Type, uint64_t Offset, uint64_t S, 404 uint64_t LocData, int64_t /*Addend*/) { 405 // FIXME: Take in account implicit addends to get correct results. 406 if (Type == ELF::R_MIPS_32) 407 return (S + LocData) & 0xFFFFFFFF; 408 if (Type == ELF::R_MIPS_TLS_DTPREL32) 409 return (S + LocData) & 0xFFFFFFFF; 410 llvm_unreachable("Invalid relocation type"); 411 } 412 413 static bool supportsSparc32(uint64_t Type) { 414 switch (Type) { 415 case ELF::R_SPARC_32: 416 case ELF::R_SPARC_UA32: 417 return true; 418 default: 419 return false; 420 } 421 } 422 423 static uint64_t resolveSparc32(uint64_t Type, uint64_t Offset, uint64_t S, 424 uint64_t LocData, int64_t Addend) { 425 if (Type == ELF::R_SPARC_32 || Type == ELF::R_SPARC_UA32) 426 return S + Addend; 427 return LocData; 428 } 429 430 static bool supportsHexagon(uint64_t Type) { 431 return Type == ELF::R_HEX_32; 432 } 433 434 static uint64_t resolveHexagon(uint64_t Type, uint64_t Offset, uint64_t S, 435 uint64_t /*LocData*/, int64_t Addend) { 436 if (Type == ELF::R_HEX_32) 437 return S + Addend; 438 llvm_unreachable("Invalid relocation type"); 439 } 440 441 static bool supportsRISCV(uint64_t Type) { 442 switch (Type) { 443 case ELF::R_RISCV_NONE: 444 case ELF::R_RISCV_32: 445 case ELF::R_RISCV_32_PCREL: 446 case ELF::R_RISCV_64: 447 case ELF::R_RISCV_SET6: 448 case ELF::R_RISCV_SET8: 449 case ELF::R_RISCV_SUB6: 450 case ELF::R_RISCV_ADD8: 451 case ELF::R_RISCV_SUB8: 452 case ELF::R_RISCV_SET16: 453 case ELF::R_RISCV_ADD16: 454 case ELF::R_RISCV_SUB16: 455 case ELF::R_RISCV_SET32: 456 case ELF::R_RISCV_ADD32: 457 case ELF::R_RISCV_SUB32: 458 case ELF::R_RISCV_ADD64: 459 case ELF::R_RISCV_SUB64: 460 return true; 461 default: 462 return false; 463 } 464 } 465 466 static uint64_t resolveRISCV(uint64_t Type, uint64_t Offset, uint64_t S, 467 uint64_t LocData, int64_t Addend) { 468 int64_t RA = Addend; 469 uint64_t A = LocData; 470 switch (Type) { 471 case ELF::R_RISCV_NONE: 472 return LocData; 473 case ELF::R_RISCV_32: 474 return (S + RA) & 0xFFFFFFFF; 475 case ELF::R_RISCV_32_PCREL: 476 return (S + RA - Offset) & 0xFFFFFFFF; 477 case ELF::R_RISCV_64: 478 return S + RA; 479 case ELF::R_RISCV_SET6: 480 return (A & 0xC0) | ((S + RA) & 0x3F); 481 case ELF::R_RISCV_SUB6: 482 return (A & 0xC0) | (((A & 0x3F) - (S + RA)) & 0x3F); 483 case ELF::R_RISCV_SET8: 484 return (S + RA) & 0xFF; 485 case ELF::R_RISCV_ADD8: 486 return (A + (S + RA)) & 0xFF; 487 case ELF::R_RISCV_SUB8: 488 return (A - (S + RA)) & 0xFF; 489 case ELF::R_RISCV_SET16: 490 return (S + RA) & 0xFFFF; 491 case ELF::R_RISCV_ADD16: 492 return (A + (S + RA)) & 0xFFFF; 493 case ELF::R_RISCV_SUB16: 494 return (A - (S + RA)) & 0xFFFF; 495 case ELF::R_RISCV_SET32: 496 return (S + RA) & 0xFFFFFFFF; 497 case ELF::R_RISCV_ADD32: 498 return (A + (S + RA)) & 0xFFFFFFFF; 499 case ELF::R_RISCV_SUB32: 500 return (A - (S + RA)) & 0xFFFFFFFF; 501 case ELF::R_RISCV_ADD64: 502 return (A + (S + RA)); 503 case ELF::R_RISCV_SUB64: 504 return (A - (S + RA)); 505 default: 506 llvm_unreachable("Invalid relocation type"); 507 } 508 } 509 510 static bool supportsCSKY(uint64_t Type) { 511 switch (Type) { 512 case ELF::R_CKCORE_NONE: 513 case ELF::R_CKCORE_ADDR32: 514 case ELF::R_CKCORE_PCREL32: 515 return true; 516 default: 517 return false; 518 } 519 } 520 521 static uint64_t resolveCSKY(uint64_t Type, uint64_t Offset, uint64_t S, 522 uint64_t LocData, int64_t Addend) { 523 switch (Type) { 524 case ELF::R_CKCORE_NONE: 525 return LocData; 526 case ELF::R_CKCORE_ADDR32: 527 return (S + Addend) & 0xFFFFFFFF; 528 case ELF::R_CKCORE_PCREL32: 529 return (S + Addend - Offset) & 0xFFFFFFFF; 530 default: 531 llvm_unreachable("Invalid relocation type"); 532 } 533 } 534 535 static bool supportsLoongArch(uint64_t Type) { 536 switch (Type) { 537 case ELF::R_LARCH_NONE: 538 case ELF::R_LARCH_32: 539 case ELF::R_LARCH_32_PCREL: 540 case ELF::R_LARCH_64: 541 case ELF::R_LARCH_ADD8: 542 case ELF::R_LARCH_SUB8: 543 case ELF::R_LARCH_ADD16: 544 case ELF::R_LARCH_SUB16: 545 case ELF::R_LARCH_ADD32: 546 case ELF::R_LARCH_SUB32: 547 case ELF::R_LARCH_ADD64: 548 case ELF::R_LARCH_SUB64: 549 return true; 550 default: 551 return false; 552 } 553 } 554 555 static uint64_t resolveLoongArch(uint64_t Type, uint64_t Offset, uint64_t S, 556 uint64_t LocData, int64_t Addend) { 557 switch (Type) { 558 case ELF::R_LARCH_NONE: 559 return LocData; 560 case ELF::R_LARCH_32: 561 return (S + Addend) & 0xFFFFFFFF; 562 case ELF::R_LARCH_32_PCREL: 563 return (S + Addend - Offset) & 0xFFFFFFFF; 564 case ELF::R_LARCH_64: 565 return S + Addend; 566 case ELF::R_LARCH_ADD8: 567 return (LocData + (S + Addend)) & 0xFF; 568 case ELF::R_LARCH_SUB8: 569 return (LocData - (S + Addend)) & 0xFF; 570 case ELF::R_LARCH_ADD16: 571 return (LocData + (S + Addend)) & 0xFFFF; 572 case ELF::R_LARCH_SUB16: 573 return (LocData - (S + Addend)) & 0xFFFF; 574 case ELF::R_LARCH_ADD32: 575 return (LocData + (S + Addend)) & 0xFFFFFFFF; 576 case ELF::R_LARCH_SUB32: 577 return (LocData - (S + Addend)) & 0xFFFFFFFF; 578 case ELF::R_LARCH_ADD64: 579 return (LocData + (S + Addend)); 580 case ELF::R_LARCH_SUB64: 581 return (LocData - (S + Addend)); 582 default: 583 llvm_unreachable("Invalid relocation type"); 584 } 585 } 586 587 static bool supportsCOFFX86(uint64_t Type) { 588 switch (Type) { 589 case COFF::IMAGE_REL_I386_SECREL: 590 case COFF::IMAGE_REL_I386_DIR32: 591 return true; 592 default: 593 return false; 594 } 595 } 596 597 static uint64_t resolveCOFFX86(uint64_t Type, uint64_t Offset, uint64_t S, 598 uint64_t LocData, int64_t /*Addend*/) { 599 switch (Type) { 600 case COFF::IMAGE_REL_I386_SECREL: 601 case COFF::IMAGE_REL_I386_DIR32: 602 return (S + LocData) & 0xFFFFFFFF; 603 default: 604 llvm_unreachable("Invalid relocation type"); 605 } 606 } 607 608 static bool supportsCOFFX86_64(uint64_t Type) { 609 switch (Type) { 610 case COFF::IMAGE_REL_AMD64_SECREL: 611 case COFF::IMAGE_REL_AMD64_ADDR64: 612 return true; 613 default: 614 return false; 615 } 616 } 617 618 static uint64_t resolveCOFFX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 619 uint64_t LocData, int64_t /*Addend*/) { 620 switch (Type) { 621 case COFF::IMAGE_REL_AMD64_SECREL: 622 return (S + LocData) & 0xFFFFFFFF; 623 case COFF::IMAGE_REL_AMD64_ADDR64: 624 return S + LocData; 625 default: 626 llvm_unreachable("Invalid relocation type"); 627 } 628 } 629 630 static bool supportsCOFFARM(uint64_t Type) { 631 switch (Type) { 632 case COFF::IMAGE_REL_ARM_SECREL: 633 case COFF::IMAGE_REL_ARM_ADDR32: 634 return true; 635 default: 636 return false; 637 } 638 } 639 640 static uint64_t resolveCOFFARM(uint64_t Type, uint64_t Offset, uint64_t S, 641 uint64_t LocData, int64_t /*Addend*/) { 642 switch (Type) { 643 case COFF::IMAGE_REL_ARM_SECREL: 644 case COFF::IMAGE_REL_ARM_ADDR32: 645 return (S + LocData) & 0xFFFFFFFF; 646 default: 647 llvm_unreachable("Invalid relocation type"); 648 } 649 } 650 651 static bool supportsCOFFARM64(uint64_t Type) { 652 switch (Type) { 653 case COFF::IMAGE_REL_ARM64_SECREL: 654 case COFF::IMAGE_REL_ARM64_ADDR64: 655 return true; 656 default: 657 return false; 658 } 659 } 660 661 static uint64_t resolveCOFFARM64(uint64_t Type, uint64_t Offset, uint64_t S, 662 uint64_t LocData, int64_t /*Addend*/) { 663 switch (Type) { 664 case COFF::IMAGE_REL_ARM64_SECREL: 665 return (S + LocData) & 0xFFFFFFFF; 666 case COFF::IMAGE_REL_ARM64_ADDR64: 667 return S + LocData; 668 default: 669 llvm_unreachable("Invalid relocation type"); 670 } 671 } 672 673 static bool supportsMachOX86_64(uint64_t Type) { 674 return Type == MachO::X86_64_RELOC_UNSIGNED; 675 } 676 677 static uint64_t resolveMachOX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 678 uint64_t LocData, int64_t /*Addend*/) { 679 if (Type == MachO::X86_64_RELOC_UNSIGNED) 680 return S; 681 llvm_unreachable("Invalid relocation type"); 682 } 683 684 static bool supportsWasm32(uint64_t Type) { 685 switch (Type) { 686 case wasm::R_WASM_FUNCTION_INDEX_LEB: 687 case wasm::R_WASM_TABLE_INDEX_SLEB: 688 case wasm::R_WASM_TABLE_INDEX_I32: 689 case wasm::R_WASM_MEMORY_ADDR_LEB: 690 case wasm::R_WASM_MEMORY_ADDR_SLEB: 691 case wasm::R_WASM_MEMORY_ADDR_I32: 692 case wasm::R_WASM_TYPE_INDEX_LEB: 693 case wasm::R_WASM_GLOBAL_INDEX_LEB: 694 case wasm::R_WASM_FUNCTION_OFFSET_I32: 695 case wasm::R_WASM_SECTION_OFFSET_I32: 696 case wasm::R_WASM_TAG_INDEX_LEB: 697 case wasm::R_WASM_GLOBAL_INDEX_I32: 698 case wasm::R_WASM_TABLE_NUMBER_LEB: 699 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 700 return true; 701 default: 702 return false; 703 } 704 } 705 706 static bool supportsWasm64(uint64_t Type) { 707 switch (Type) { 708 case wasm::R_WASM_MEMORY_ADDR_LEB64: 709 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 710 case wasm::R_WASM_MEMORY_ADDR_I64: 711 case wasm::R_WASM_TABLE_INDEX_SLEB64: 712 case wasm::R_WASM_TABLE_INDEX_I64: 713 case wasm::R_WASM_FUNCTION_OFFSET_I64: 714 return true; 715 default: 716 return supportsWasm32(Type); 717 } 718 } 719 720 static uint64_t resolveWasm32(uint64_t Type, uint64_t Offset, uint64_t S, 721 uint64_t LocData, int64_t /*Addend*/) { 722 switch (Type) { 723 case wasm::R_WASM_FUNCTION_INDEX_LEB: 724 case wasm::R_WASM_TABLE_INDEX_SLEB: 725 case wasm::R_WASM_TABLE_INDEX_I32: 726 case wasm::R_WASM_MEMORY_ADDR_LEB: 727 case wasm::R_WASM_MEMORY_ADDR_SLEB: 728 case wasm::R_WASM_MEMORY_ADDR_I32: 729 case wasm::R_WASM_TYPE_INDEX_LEB: 730 case wasm::R_WASM_GLOBAL_INDEX_LEB: 731 case wasm::R_WASM_FUNCTION_OFFSET_I32: 732 case wasm::R_WASM_SECTION_OFFSET_I32: 733 case wasm::R_WASM_TAG_INDEX_LEB: 734 case wasm::R_WASM_GLOBAL_INDEX_I32: 735 case wasm::R_WASM_TABLE_NUMBER_LEB: 736 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 737 // For wasm section, its offset at 0 -- ignoring Value 738 return LocData; 739 default: 740 llvm_unreachable("Invalid relocation type"); 741 } 742 } 743 744 static uint64_t resolveWasm64(uint64_t Type, uint64_t Offset, uint64_t S, 745 uint64_t LocData, int64_t Addend) { 746 switch (Type) { 747 case wasm::R_WASM_MEMORY_ADDR_LEB64: 748 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 749 case wasm::R_WASM_MEMORY_ADDR_I64: 750 case wasm::R_WASM_TABLE_INDEX_SLEB64: 751 case wasm::R_WASM_TABLE_INDEX_I64: 752 case wasm::R_WASM_FUNCTION_OFFSET_I64: 753 // For wasm section, its offset at 0 -- ignoring Value 754 return LocData; 755 default: 756 return resolveWasm32(Type, Offset, S, LocData, Addend); 757 } 758 } 759 760 std::pair<SupportsRelocation, RelocationResolver> 761 getRelocationResolver(const ObjectFile &Obj) { 762 if (Obj.isCOFF()) { 763 switch (Obj.getArch()) { 764 case Triple::x86_64: 765 return {supportsCOFFX86_64, resolveCOFFX86_64}; 766 case Triple::x86: 767 return {supportsCOFFX86, resolveCOFFX86}; 768 case Triple::arm: 769 case Triple::thumb: 770 return {supportsCOFFARM, resolveCOFFARM}; 771 case Triple::aarch64: 772 return {supportsCOFFARM64, resolveCOFFARM64}; 773 default: 774 return {nullptr, nullptr}; 775 } 776 } else if (Obj.isELF()) { 777 if (Obj.getBytesInAddress() == 8) { 778 switch (Obj.getArch()) { 779 case Triple::x86_64: 780 return {supportsX86_64, resolveX86_64}; 781 case Triple::aarch64: 782 case Triple::aarch64_be: 783 return {supportsAArch64, resolveAArch64}; 784 case Triple::bpfel: 785 case Triple::bpfeb: 786 return {supportsBPF, resolveBPF}; 787 case Triple::loongarch64: 788 return {supportsLoongArch, resolveLoongArch}; 789 case Triple::mips64el: 790 case Triple::mips64: 791 return {supportsMips64, resolveMips64}; 792 case Triple::ppc64le: 793 case Triple::ppc64: 794 return {supportsPPC64, resolvePPC64}; 795 case Triple::systemz: 796 return {supportsSystemZ, resolveSystemZ}; 797 case Triple::sparcv9: 798 return {supportsSparc64, resolveSparc64}; 799 case Triple::amdgcn: 800 return {supportsAmdgpu, resolveAmdgpu}; 801 case Triple::riscv64: 802 return {supportsRISCV, resolveRISCV}; 803 default: 804 if (isAMDGPU(Obj)) 805 return {supportsAmdgpu, resolveAmdgpu}; 806 return {nullptr, nullptr}; 807 } 808 } 809 810 // 32-bit object file 811 assert(Obj.getBytesInAddress() == 4 && 812 "Invalid word size in object file"); 813 814 switch (Obj.getArch()) { 815 case Triple::x86: 816 return {supportsX86, resolveX86}; 817 case Triple::ppcle: 818 case Triple::ppc: 819 return {supportsPPC32, resolvePPC32}; 820 case Triple::arm: 821 case Triple::armeb: 822 return {supportsARM, resolveARM}; 823 case Triple::avr: 824 return {supportsAVR, resolveAVR}; 825 case Triple::lanai: 826 return {supportsLanai, resolveLanai}; 827 case Triple::loongarch32: 828 return {supportsLoongArch, resolveLoongArch}; 829 case Triple::mipsel: 830 case Triple::mips: 831 return {supportsMips32, resolveMips32}; 832 case Triple::msp430: 833 return {supportsMSP430, resolveMSP430}; 834 case Triple::sparc: 835 return {supportsSparc32, resolveSparc32}; 836 case Triple::hexagon: 837 return {supportsHexagon, resolveHexagon}; 838 case Triple::r600: 839 return {supportsAmdgpu, resolveAmdgpu}; 840 case Triple::riscv32: 841 return {supportsRISCV, resolveRISCV}; 842 case Triple::csky: 843 return {supportsCSKY, resolveCSKY}; 844 default: 845 if (isAMDGPU(Obj)) 846 return {supportsAmdgpu, resolveAmdgpu}; 847 return {nullptr, nullptr}; 848 } 849 } else if (Obj.isMachO()) { 850 if (Obj.getArch() == Triple::x86_64) 851 return {supportsMachOX86_64, resolveMachOX86_64}; 852 return {nullptr, nullptr}; 853 } else if (Obj.isWasm()) { 854 if (Obj.getArch() == Triple::wasm32) 855 return {supportsWasm32, resolveWasm32}; 856 if (Obj.getArch() == Triple::wasm64) 857 return {supportsWasm64, resolveWasm64}; 858 return {nullptr, nullptr}; 859 } 860 861 llvm_unreachable("Invalid object file"); 862 } 863 864 uint64_t resolveRelocation(RelocationResolver Resolver, const RelocationRef &R, 865 uint64_t S, uint64_t LocData) { 866 if (const ObjectFile *Obj = R.getObject()) { 867 int64_t Addend = 0; 868 if (Obj->isELF()) { 869 auto GetRelSectionType = [&]() -> unsigned { 870 if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj)) 871 return Elf32LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 872 if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj)) 873 return Elf64LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 874 if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj)) 875 return Elf32BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 876 auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj); 877 return Elf64BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 878 }; 879 880 if (GetRelSectionType() == ELF::SHT_RELA) { 881 Addend = getELFAddend(R); 882 // RISCV relocations use both LocData and Addend. 883 if (Obj->getArch() != Triple::riscv32 && 884 Obj->getArch() != Triple::riscv64) 885 LocData = 0; 886 } 887 } 888 889 return Resolver(R.getType(), R.getOffset(), S, LocData, Addend); 890 } 891 892 // Sometimes the caller might want to use its own specific implementation of 893 // the resolver function. E.g. this is used by LLD when it resolves debug 894 // relocations and assumes that all of them have the same computation (S + A). 895 // The relocation R has no owner object in this case and we don't need to 896 // provide Type and Offset fields. It is also assumed the DataRefImpl.p 897 // contains the addend, provided by the caller. 898 return Resolver(/*Type=*/0, /*Offset=*/0, S, LocData, 899 R.getRawDataRefImpl().p); 900 } 901 902 } // namespace object 903 } // namespace llvm 904