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/ObjectFile.h" 21 #include "llvm/Object/SymbolicFile.h" 22 #include "llvm/Support/Casting.h" 23 #include "llvm/Support/Error.h" 24 #include "llvm/Support/ErrorHandling.h" 25 #include "llvm/TargetParser/Triple.h" 26 #include <cassert> 27 28 namespace llvm { 29 namespace object { 30 31 static int64_t getELFAddend(RelocationRef R) { 32 Expected<int64_t> AddendOrErr = ELFRelocationRef(R).getAddend(); 33 handleAllErrors(AddendOrErr.takeError(), [](const ErrorInfoBase &EI) { 34 report_fatal_error(Twine(EI.message())); 35 }); 36 return *AddendOrErr; 37 } 38 39 static bool supportsX86_64(uint64_t Type) { 40 switch (Type) { 41 case ELF::R_X86_64_NONE: 42 case ELF::R_X86_64_64: 43 case ELF::R_X86_64_DTPOFF32: 44 case ELF::R_X86_64_DTPOFF64: 45 case ELF::R_X86_64_PC32: 46 case ELF::R_X86_64_PC64: 47 case ELF::R_X86_64_32: 48 case ELF::R_X86_64_32S: 49 return true; 50 default: 51 return false; 52 } 53 } 54 55 static uint64_t resolveX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 56 uint64_t LocData, int64_t Addend) { 57 switch (Type) { 58 case ELF::R_X86_64_NONE: 59 return LocData; 60 case ELF::R_X86_64_64: 61 case ELF::R_X86_64_DTPOFF32: 62 case ELF::R_X86_64_DTPOFF64: 63 return S + Addend; 64 case ELF::R_X86_64_PC32: 65 case ELF::R_X86_64_PC64: 66 return S + Addend - Offset; 67 case ELF::R_X86_64_32: 68 case ELF::R_X86_64_32S: 69 return (S + Addend) & 0xFFFFFFFF; 70 default: 71 llvm_unreachable("Invalid relocation type"); 72 } 73 } 74 75 static bool supportsAArch64(uint64_t Type) { 76 switch (Type) { 77 case ELF::R_AARCH64_ABS32: 78 case ELF::R_AARCH64_ABS64: 79 case ELF::R_AARCH64_PREL16: 80 case ELF::R_AARCH64_PREL32: 81 case ELF::R_AARCH64_PREL64: 82 return true; 83 default: 84 return false; 85 } 86 } 87 88 static uint64_t resolveAArch64(uint64_t Type, uint64_t Offset, uint64_t S, 89 uint64_t /*LocData*/, int64_t Addend) { 90 switch (Type) { 91 case ELF::R_AARCH64_ABS32: 92 return (S + Addend) & 0xFFFFFFFF; 93 case ELF::R_AARCH64_ABS64: 94 return S + Addend; 95 case ELF::R_AARCH64_PREL16: 96 return (S + Addend - Offset) & 0xFFFF; 97 case ELF::R_AARCH64_PREL32: 98 return (S + Addend - Offset) & 0xFFFFFFFF; 99 case ELF::R_AARCH64_PREL64: 100 return S + Addend - Offset; 101 default: 102 llvm_unreachable("Invalid relocation type"); 103 } 104 } 105 106 static bool supportsBPF(uint64_t Type) { 107 switch (Type) { 108 case ELF::R_BPF_64_ABS32: 109 case ELF::R_BPF_64_ABS64: 110 return true; 111 default: 112 return false; 113 } 114 } 115 116 static uint64_t resolveBPF(uint64_t Type, uint64_t Offset, uint64_t S, 117 uint64_t LocData, int64_t /*Addend*/) { 118 switch (Type) { 119 case ELF::R_BPF_64_ABS32: 120 return (S + LocData) & 0xFFFFFFFF; 121 case ELF::R_BPF_64_ABS64: 122 return S + LocData; 123 default: 124 llvm_unreachable("Invalid relocation type"); 125 } 126 } 127 128 static bool supportsMips64(uint64_t Type) { 129 switch (Type) { 130 case ELF::R_MIPS_32: 131 case ELF::R_MIPS_64: 132 case ELF::R_MIPS_TLS_DTPREL64: 133 case ELF::R_MIPS_PC32: 134 return true; 135 default: 136 return false; 137 } 138 } 139 140 static uint64_t resolveMips64(uint64_t Type, uint64_t Offset, uint64_t S, 141 uint64_t /*LocData*/, int64_t Addend) { 142 switch (Type) { 143 case ELF::R_MIPS_32: 144 return (S + Addend) & 0xFFFFFFFF; 145 case ELF::R_MIPS_64: 146 return S + Addend; 147 case ELF::R_MIPS_TLS_DTPREL64: 148 return S + Addend - 0x8000; 149 case ELF::R_MIPS_PC32: 150 return S + Addend - Offset; 151 default: 152 llvm_unreachable("Invalid relocation type"); 153 } 154 } 155 156 static bool supportsMSP430(uint64_t Type) { 157 switch (Type) { 158 case ELF::R_MSP430_32: 159 case ELF::R_MSP430_16_BYTE: 160 return true; 161 default: 162 return false; 163 } 164 } 165 166 static uint64_t resolveMSP430(uint64_t Type, uint64_t Offset, uint64_t S, 167 uint64_t /*LocData*/, int64_t Addend) { 168 switch (Type) { 169 case ELF::R_MSP430_32: 170 return (S + Addend) & 0xFFFFFFFF; 171 case ELF::R_MSP430_16_BYTE: 172 return (S + Addend) & 0xFFFF; 173 default: 174 llvm_unreachable("Invalid relocation type"); 175 } 176 } 177 178 static bool supportsPPC64(uint64_t Type) { 179 switch (Type) { 180 case ELF::R_PPC64_ADDR32: 181 case ELF::R_PPC64_ADDR64: 182 case ELF::R_PPC64_REL32: 183 case ELF::R_PPC64_REL64: 184 return true; 185 default: 186 return false; 187 } 188 } 189 190 static uint64_t resolvePPC64(uint64_t Type, uint64_t Offset, uint64_t S, 191 uint64_t /*LocData*/, int64_t Addend) { 192 switch (Type) { 193 case ELF::R_PPC64_ADDR32: 194 return (S + Addend) & 0xFFFFFFFF; 195 case ELF::R_PPC64_ADDR64: 196 return S + Addend; 197 case ELF::R_PPC64_REL32: 198 return (S + Addend - Offset) & 0xFFFFFFFF; 199 case ELF::R_PPC64_REL64: 200 return S + Addend - Offset; 201 default: 202 llvm_unreachable("Invalid relocation type"); 203 } 204 } 205 206 static bool supportsSystemZ(uint64_t Type) { 207 switch (Type) { 208 case ELF::R_390_32: 209 case ELF::R_390_64: 210 return true; 211 default: 212 return false; 213 } 214 } 215 216 static uint64_t resolveSystemZ(uint64_t Type, uint64_t Offset, uint64_t S, 217 uint64_t /*LocData*/, int64_t Addend) { 218 switch (Type) { 219 case ELF::R_390_32: 220 return (S + Addend) & 0xFFFFFFFF; 221 case ELF::R_390_64: 222 return S + Addend; 223 default: 224 llvm_unreachable("Invalid relocation type"); 225 } 226 } 227 228 static bool supportsSparc64(uint64_t Type) { 229 switch (Type) { 230 case ELF::R_SPARC_32: 231 case ELF::R_SPARC_64: 232 case ELF::R_SPARC_UA32: 233 case ELF::R_SPARC_UA64: 234 return true; 235 default: 236 return false; 237 } 238 } 239 240 static uint64_t resolveSparc64(uint64_t Type, uint64_t Offset, uint64_t S, 241 uint64_t /*LocData*/, int64_t Addend) { 242 switch (Type) { 243 case ELF::R_SPARC_32: 244 case ELF::R_SPARC_64: 245 case ELF::R_SPARC_UA32: 246 case ELF::R_SPARC_UA64: 247 return S + Addend; 248 default: 249 llvm_unreachable("Invalid relocation type"); 250 } 251 } 252 253 /// Returns true if \c Obj is an AMDGPU code object based solely on the value 254 /// of e_machine. 255 /// 256 /// AMDGPU code objects with an e_machine of EF_AMDGPU_MACH_NONE do not 257 /// identify their arch as either r600 or amdgcn, but we can still handle 258 /// their relocations. When we identify an ELF object with an UnknownArch, 259 /// we use isAMDGPU to check for this case. 260 static bool isAMDGPU(const ObjectFile &Obj) { 261 if (const auto *ELFObj = dyn_cast<ELFObjectFileBase>(&Obj)) 262 return ELFObj->getEMachine() == ELF::EM_AMDGPU; 263 return false; 264 } 265 266 static bool supportsAmdgpu(uint64_t Type) { 267 switch (Type) { 268 case ELF::R_AMDGPU_ABS32: 269 case ELF::R_AMDGPU_ABS64: 270 return true; 271 default: 272 return false; 273 } 274 } 275 276 static uint64_t resolveAmdgpu(uint64_t Type, uint64_t Offset, uint64_t S, 277 uint64_t /*LocData*/, int64_t Addend) { 278 switch (Type) { 279 case ELF::R_AMDGPU_ABS32: 280 case ELF::R_AMDGPU_ABS64: 281 return S + Addend; 282 default: 283 llvm_unreachable("Invalid relocation type"); 284 } 285 } 286 287 static bool supportsX86(uint64_t Type) { 288 switch (Type) { 289 case ELF::R_386_NONE: 290 case ELF::R_386_32: 291 case ELF::R_386_PC32: 292 return true; 293 default: 294 return false; 295 } 296 } 297 298 static uint64_t resolveX86(uint64_t Type, uint64_t Offset, uint64_t S, 299 uint64_t LocData, int64_t /*Addend*/) { 300 switch (Type) { 301 case ELF::R_386_NONE: 302 return LocData; 303 case ELF::R_386_32: 304 return S + LocData; 305 case ELF::R_386_PC32: 306 return S - Offset + LocData; 307 default: 308 llvm_unreachable("Invalid relocation type"); 309 } 310 } 311 312 static bool supportsPPC32(uint64_t Type) { 313 switch (Type) { 314 case ELF::R_PPC_ADDR32: 315 case ELF::R_PPC_REL32: 316 return true; 317 default: 318 return false; 319 } 320 } 321 322 static uint64_t resolvePPC32(uint64_t Type, uint64_t Offset, uint64_t S, 323 uint64_t /*LocData*/, int64_t Addend) { 324 switch (Type) { 325 case ELF::R_PPC_ADDR32: 326 return (S + Addend) & 0xFFFFFFFF; 327 case ELF::R_PPC_REL32: 328 return (S + Addend - Offset) & 0xFFFFFFFF; 329 } 330 llvm_unreachable("Invalid relocation type"); 331 } 332 333 static bool supportsARM(uint64_t Type) { 334 switch (Type) { 335 case ELF::R_ARM_ABS32: 336 case ELF::R_ARM_REL32: 337 return true; 338 default: 339 return false; 340 } 341 } 342 343 static uint64_t resolveARM(uint64_t Type, uint64_t Offset, uint64_t S, 344 uint64_t LocData, int64_t Addend) { 345 // Support both RELA and REL relocations. The caller is responsible 346 // for supplying the correct values for LocData and Addend, i.e. 347 // Addend == 0 for REL and LocData == 0 for RELA. 348 assert((LocData == 0 || Addend == 0) && 349 "one of LocData and Addend must be 0"); 350 switch (Type) { 351 case ELF::R_ARM_ABS32: 352 return (S + LocData + Addend) & 0xFFFFFFFF; 353 case ELF::R_ARM_REL32: 354 return (S + LocData + Addend - Offset) & 0xFFFFFFFF; 355 } 356 llvm_unreachable("Invalid relocation type"); 357 } 358 359 static bool supportsAVR(uint64_t Type) { 360 switch (Type) { 361 case ELF::R_AVR_16: 362 case ELF::R_AVR_32: 363 return true; 364 default: 365 return false; 366 } 367 } 368 369 static uint64_t resolveAVR(uint64_t Type, uint64_t Offset, uint64_t S, 370 uint64_t /*LocData*/, int64_t Addend) { 371 switch (Type) { 372 case ELF::R_AVR_16: 373 return (S + Addend) & 0xFFFF; 374 case ELF::R_AVR_32: 375 return (S + Addend) & 0xFFFFFFFF; 376 default: 377 llvm_unreachable("Invalid relocation type"); 378 } 379 } 380 381 static bool supportsLanai(uint64_t Type) { 382 return Type == ELF::R_LANAI_32; 383 } 384 385 static uint64_t resolveLanai(uint64_t Type, uint64_t Offset, uint64_t S, 386 uint64_t /*LocData*/, int64_t Addend) { 387 if (Type == ELF::R_LANAI_32) 388 return (S + Addend) & 0xFFFFFFFF; 389 llvm_unreachable("Invalid relocation type"); 390 } 391 392 static bool supportsMips32(uint64_t Type) { 393 switch (Type) { 394 case ELF::R_MIPS_32: 395 case ELF::R_MIPS_TLS_DTPREL32: 396 return true; 397 default: 398 return false; 399 } 400 } 401 402 static uint64_t resolveMips32(uint64_t Type, uint64_t Offset, uint64_t S, 403 uint64_t LocData, int64_t /*Addend*/) { 404 // FIXME: Take in account implicit addends to get correct results. 405 if (Type == ELF::R_MIPS_32) 406 return (S + LocData) & 0xFFFFFFFF; 407 if (Type == ELF::R_MIPS_TLS_DTPREL32) 408 return (S + LocData) & 0xFFFFFFFF; 409 llvm_unreachable("Invalid relocation type"); 410 } 411 412 static bool supportsSparc32(uint64_t Type) { 413 switch (Type) { 414 case ELF::R_SPARC_32: 415 case ELF::R_SPARC_UA32: 416 return true; 417 default: 418 return false; 419 } 420 } 421 422 static uint64_t resolveSparc32(uint64_t Type, uint64_t Offset, uint64_t S, 423 uint64_t LocData, int64_t Addend) { 424 if (Type == ELF::R_SPARC_32 || Type == ELF::R_SPARC_UA32) 425 return S + Addend; 426 return LocData; 427 } 428 429 static bool supportsHexagon(uint64_t Type) { 430 return Type == ELF::R_HEX_32; 431 } 432 433 static uint64_t resolveHexagon(uint64_t Type, uint64_t Offset, uint64_t S, 434 uint64_t /*LocData*/, int64_t Addend) { 435 if (Type == ELF::R_HEX_32) 436 return S + Addend; 437 llvm_unreachable("Invalid relocation type"); 438 } 439 440 static bool supportsRISCV(uint64_t Type) { 441 switch (Type) { 442 case ELF::R_RISCV_NONE: 443 case ELF::R_RISCV_32: 444 case ELF::R_RISCV_32_PCREL: 445 case ELF::R_RISCV_64: 446 case ELF::R_RISCV_SET6: 447 case ELF::R_RISCV_SET8: 448 case ELF::R_RISCV_SUB6: 449 case ELF::R_RISCV_ADD8: 450 case ELF::R_RISCV_SUB8: 451 case ELF::R_RISCV_SET16: 452 case ELF::R_RISCV_ADD16: 453 case ELF::R_RISCV_SUB16: 454 case ELF::R_RISCV_SET32: 455 case ELF::R_RISCV_ADD32: 456 case ELF::R_RISCV_SUB32: 457 case ELF::R_RISCV_ADD64: 458 case ELF::R_RISCV_SUB64: 459 // Because the unrelocated value generated by .uleb128 A-B (used by 460 // loclists/rnglists) is meaningful, DebugInfoDWARF does not inspect the 461 // relocations. We declare support for the two relocation types without an 462 // (unreachable) implementation. 463 case ELF::R_RISCV_SET_ULEB128: 464 case ELF::R_RISCV_SUB_ULEB128: 465 return true; 466 default: 467 return false; 468 } 469 } 470 471 static uint64_t resolveRISCV(uint64_t Type, uint64_t Offset, uint64_t S, 472 uint64_t LocData, int64_t Addend) { 473 int64_t RA = Addend; 474 uint64_t A = LocData; 475 switch (Type) { 476 case ELF::R_RISCV_NONE: 477 return LocData; 478 case ELF::R_RISCV_32: 479 return (S + RA) & 0xFFFFFFFF; 480 case ELF::R_RISCV_32_PCREL: 481 return (S + RA - Offset) & 0xFFFFFFFF; 482 case ELF::R_RISCV_64: 483 return S + RA; 484 case ELF::R_RISCV_SET6: 485 return (A & 0xC0) | ((S + RA) & 0x3F); 486 case ELF::R_RISCV_SUB6: 487 return (A & 0xC0) | (((A & 0x3F) - (S + RA)) & 0x3F); 488 case ELF::R_RISCV_SET8: 489 return (S + RA) & 0xFF; 490 case ELF::R_RISCV_ADD8: 491 return (A + (S + RA)) & 0xFF; 492 case ELF::R_RISCV_SUB8: 493 return (A - (S + RA)) & 0xFF; 494 case ELF::R_RISCV_SET16: 495 return (S + RA) & 0xFFFF; 496 case ELF::R_RISCV_ADD16: 497 return (A + (S + RA)) & 0xFFFF; 498 case ELF::R_RISCV_SUB16: 499 return (A - (S + RA)) & 0xFFFF; 500 case ELF::R_RISCV_SET32: 501 return (S + RA) & 0xFFFFFFFF; 502 case ELF::R_RISCV_ADD32: 503 return (A + (S + RA)) & 0xFFFFFFFF; 504 case ELF::R_RISCV_SUB32: 505 return (A - (S + RA)) & 0xFFFFFFFF; 506 case ELF::R_RISCV_ADD64: 507 return (A + (S + RA)); 508 case ELF::R_RISCV_SUB64: 509 return (A - (S + RA)); 510 default: 511 llvm_unreachable("Invalid relocation type"); 512 } 513 } 514 515 static bool supportsCSKY(uint64_t Type) { 516 switch (Type) { 517 case ELF::R_CKCORE_NONE: 518 case ELF::R_CKCORE_ADDR32: 519 case ELF::R_CKCORE_PCREL32: 520 return true; 521 default: 522 return false; 523 } 524 } 525 526 static uint64_t resolveCSKY(uint64_t Type, uint64_t Offset, uint64_t S, 527 uint64_t LocData, int64_t Addend) { 528 switch (Type) { 529 case ELF::R_CKCORE_NONE: 530 return LocData; 531 case ELF::R_CKCORE_ADDR32: 532 return (S + Addend) & 0xFFFFFFFF; 533 case ELF::R_CKCORE_PCREL32: 534 return (S + Addend - Offset) & 0xFFFFFFFF; 535 default: 536 llvm_unreachable("Invalid relocation type"); 537 } 538 } 539 540 static bool supportsLoongArch(uint64_t Type) { 541 switch (Type) { 542 case ELF::R_LARCH_NONE: 543 case ELF::R_LARCH_32: 544 case ELF::R_LARCH_32_PCREL: 545 case ELF::R_LARCH_64: 546 case ELF::R_LARCH_ADD6: 547 case ELF::R_LARCH_SUB6: 548 case ELF::R_LARCH_ADD8: 549 case ELF::R_LARCH_SUB8: 550 case ELF::R_LARCH_ADD16: 551 case ELF::R_LARCH_SUB16: 552 case ELF::R_LARCH_ADD32: 553 case ELF::R_LARCH_SUB32: 554 case ELF::R_LARCH_ADD64: 555 case ELF::R_LARCH_SUB64: 556 return true; 557 default: 558 return false; 559 } 560 } 561 562 static uint64_t resolveLoongArch(uint64_t Type, uint64_t Offset, uint64_t S, 563 uint64_t LocData, int64_t Addend) { 564 switch (Type) { 565 case ELF::R_LARCH_NONE: 566 return LocData; 567 case ELF::R_LARCH_32: 568 return (S + Addend) & 0xFFFFFFFF; 569 case ELF::R_LARCH_32_PCREL: 570 return (S + Addend - Offset) & 0xFFFFFFFF; 571 case ELF::R_LARCH_64: 572 return S + Addend; 573 case ELF::R_LARCH_ADD6: 574 return (LocData & 0xC0) | ((LocData + S + Addend) & 0x3F); 575 case ELF::R_LARCH_SUB6: 576 return (LocData & 0xC0) | ((LocData - (S + Addend)) & 0x3F); 577 case ELF::R_LARCH_ADD8: 578 return (LocData + (S + Addend)) & 0xFF; 579 case ELF::R_LARCH_SUB8: 580 return (LocData - (S + Addend)) & 0xFF; 581 case ELF::R_LARCH_ADD16: 582 return (LocData + (S + Addend)) & 0xFFFF; 583 case ELF::R_LARCH_SUB16: 584 return (LocData - (S + Addend)) & 0xFFFF; 585 case ELF::R_LARCH_ADD32: 586 return (LocData + (S + Addend)) & 0xFFFFFFFF; 587 case ELF::R_LARCH_SUB32: 588 return (LocData - (S + Addend)) & 0xFFFFFFFF; 589 case ELF::R_LARCH_ADD64: 590 return (LocData + (S + Addend)); 591 case ELF::R_LARCH_SUB64: 592 return (LocData - (S + Addend)); 593 default: 594 llvm_unreachable("Invalid relocation type"); 595 } 596 } 597 598 static bool supportsCOFFX86(uint64_t Type) { 599 switch (Type) { 600 case COFF::IMAGE_REL_I386_SECREL: 601 case COFF::IMAGE_REL_I386_DIR32: 602 return true; 603 default: 604 return false; 605 } 606 } 607 608 static uint64_t resolveCOFFX86(uint64_t Type, uint64_t Offset, uint64_t S, 609 uint64_t LocData, int64_t /*Addend*/) { 610 switch (Type) { 611 case COFF::IMAGE_REL_I386_SECREL: 612 case COFF::IMAGE_REL_I386_DIR32: 613 return (S + LocData) & 0xFFFFFFFF; 614 default: 615 llvm_unreachable("Invalid relocation type"); 616 } 617 } 618 619 static bool supportsCOFFX86_64(uint64_t Type) { 620 switch (Type) { 621 case COFF::IMAGE_REL_AMD64_SECREL: 622 case COFF::IMAGE_REL_AMD64_ADDR64: 623 return true; 624 default: 625 return false; 626 } 627 } 628 629 static uint64_t resolveCOFFX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 630 uint64_t LocData, int64_t /*Addend*/) { 631 switch (Type) { 632 case COFF::IMAGE_REL_AMD64_SECREL: 633 return (S + LocData) & 0xFFFFFFFF; 634 case COFF::IMAGE_REL_AMD64_ADDR64: 635 return S + LocData; 636 default: 637 llvm_unreachable("Invalid relocation type"); 638 } 639 } 640 641 static bool supportsCOFFARM(uint64_t Type) { 642 switch (Type) { 643 case COFF::IMAGE_REL_ARM_SECREL: 644 case COFF::IMAGE_REL_ARM_ADDR32: 645 return true; 646 default: 647 return false; 648 } 649 } 650 651 static uint64_t resolveCOFFARM(uint64_t Type, uint64_t Offset, uint64_t S, 652 uint64_t LocData, int64_t /*Addend*/) { 653 switch (Type) { 654 case COFF::IMAGE_REL_ARM_SECREL: 655 case COFF::IMAGE_REL_ARM_ADDR32: 656 return (S + LocData) & 0xFFFFFFFF; 657 default: 658 llvm_unreachable("Invalid relocation type"); 659 } 660 } 661 662 static bool supportsCOFFARM64(uint64_t Type) { 663 switch (Type) { 664 case COFF::IMAGE_REL_ARM64_SECREL: 665 case COFF::IMAGE_REL_ARM64_ADDR64: 666 return true; 667 default: 668 return false; 669 } 670 } 671 672 static uint64_t resolveCOFFARM64(uint64_t Type, uint64_t Offset, uint64_t S, 673 uint64_t LocData, int64_t /*Addend*/) { 674 switch (Type) { 675 case COFF::IMAGE_REL_ARM64_SECREL: 676 return (S + LocData) & 0xFFFFFFFF; 677 case COFF::IMAGE_REL_ARM64_ADDR64: 678 return S + LocData; 679 default: 680 llvm_unreachable("Invalid relocation type"); 681 } 682 } 683 684 static bool supportsMachOX86_64(uint64_t Type) { 685 return Type == MachO::X86_64_RELOC_UNSIGNED; 686 } 687 688 static uint64_t resolveMachOX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 689 uint64_t LocData, int64_t /*Addend*/) { 690 if (Type == MachO::X86_64_RELOC_UNSIGNED) 691 return S; 692 llvm_unreachable("Invalid relocation type"); 693 } 694 695 static bool supportsWasm32(uint64_t Type) { 696 switch (Type) { 697 case wasm::R_WASM_FUNCTION_INDEX_LEB: 698 case wasm::R_WASM_TABLE_INDEX_SLEB: 699 case wasm::R_WASM_TABLE_INDEX_I32: 700 case wasm::R_WASM_MEMORY_ADDR_LEB: 701 case wasm::R_WASM_MEMORY_ADDR_SLEB: 702 case wasm::R_WASM_MEMORY_ADDR_I32: 703 case wasm::R_WASM_TYPE_INDEX_LEB: 704 case wasm::R_WASM_GLOBAL_INDEX_LEB: 705 case wasm::R_WASM_FUNCTION_OFFSET_I32: 706 case wasm::R_WASM_SECTION_OFFSET_I32: 707 case wasm::R_WASM_TAG_INDEX_LEB: 708 case wasm::R_WASM_GLOBAL_INDEX_I32: 709 case wasm::R_WASM_TABLE_NUMBER_LEB: 710 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 711 return true; 712 default: 713 return false; 714 } 715 } 716 717 static bool supportsWasm64(uint64_t Type) { 718 switch (Type) { 719 case wasm::R_WASM_MEMORY_ADDR_LEB64: 720 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 721 case wasm::R_WASM_MEMORY_ADDR_I64: 722 case wasm::R_WASM_TABLE_INDEX_SLEB64: 723 case wasm::R_WASM_TABLE_INDEX_I64: 724 case wasm::R_WASM_FUNCTION_OFFSET_I64: 725 return true; 726 default: 727 return supportsWasm32(Type); 728 } 729 } 730 731 static uint64_t resolveWasm32(uint64_t Type, uint64_t Offset, uint64_t S, 732 uint64_t LocData, int64_t /*Addend*/) { 733 switch (Type) { 734 case wasm::R_WASM_FUNCTION_INDEX_LEB: 735 case wasm::R_WASM_TABLE_INDEX_SLEB: 736 case wasm::R_WASM_TABLE_INDEX_I32: 737 case wasm::R_WASM_MEMORY_ADDR_LEB: 738 case wasm::R_WASM_MEMORY_ADDR_SLEB: 739 case wasm::R_WASM_MEMORY_ADDR_I32: 740 case wasm::R_WASM_TYPE_INDEX_LEB: 741 case wasm::R_WASM_GLOBAL_INDEX_LEB: 742 case wasm::R_WASM_FUNCTION_OFFSET_I32: 743 case wasm::R_WASM_SECTION_OFFSET_I32: 744 case wasm::R_WASM_TAG_INDEX_LEB: 745 case wasm::R_WASM_GLOBAL_INDEX_I32: 746 case wasm::R_WASM_TABLE_NUMBER_LEB: 747 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 748 // For wasm section, its offset at 0 -- ignoring Value 749 return LocData; 750 default: 751 llvm_unreachable("Invalid relocation type"); 752 } 753 } 754 755 static uint64_t resolveWasm64(uint64_t Type, uint64_t Offset, uint64_t S, 756 uint64_t LocData, int64_t Addend) { 757 switch (Type) { 758 case wasm::R_WASM_MEMORY_ADDR_LEB64: 759 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 760 case wasm::R_WASM_MEMORY_ADDR_I64: 761 case wasm::R_WASM_TABLE_INDEX_SLEB64: 762 case wasm::R_WASM_TABLE_INDEX_I64: 763 case wasm::R_WASM_FUNCTION_OFFSET_I64: 764 // For wasm section, its offset at 0 -- ignoring Value 765 return LocData; 766 default: 767 return resolveWasm32(Type, Offset, S, LocData, Addend); 768 } 769 } 770 771 std::pair<SupportsRelocation, RelocationResolver> 772 getRelocationResolver(const ObjectFile &Obj) { 773 if (Obj.isCOFF()) { 774 switch (Obj.getArch()) { 775 case Triple::x86_64: 776 return {supportsCOFFX86_64, resolveCOFFX86_64}; 777 case Triple::x86: 778 return {supportsCOFFX86, resolveCOFFX86}; 779 case Triple::arm: 780 case Triple::thumb: 781 return {supportsCOFFARM, resolveCOFFARM}; 782 case Triple::aarch64: 783 return {supportsCOFFARM64, resolveCOFFARM64}; 784 default: 785 return {nullptr, nullptr}; 786 } 787 } else if (Obj.isELF()) { 788 if (Obj.getBytesInAddress() == 8) { 789 switch (Obj.getArch()) { 790 case Triple::x86_64: 791 return {supportsX86_64, resolveX86_64}; 792 case Triple::aarch64: 793 case Triple::aarch64_be: 794 return {supportsAArch64, resolveAArch64}; 795 case Triple::bpfel: 796 case Triple::bpfeb: 797 return {supportsBPF, resolveBPF}; 798 case Triple::loongarch64: 799 return {supportsLoongArch, resolveLoongArch}; 800 case Triple::mips64el: 801 case Triple::mips64: 802 return {supportsMips64, resolveMips64}; 803 case Triple::ppc64le: 804 case Triple::ppc64: 805 return {supportsPPC64, resolvePPC64}; 806 case Triple::systemz: 807 return {supportsSystemZ, resolveSystemZ}; 808 case Triple::sparcv9: 809 return {supportsSparc64, resolveSparc64}; 810 case Triple::amdgcn: 811 return {supportsAmdgpu, resolveAmdgpu}; 812 case Triple::riscv64: 813 return {supportsRISCV, resolveRISCV}; 814 default: 815 if (isAMDGPU(Obj)) 816 return {supportsAmdgpu, resolveAmdgpu}; 817 return {nullptr, nullptr}; 818 } 819 } 820 821 // 32-bit object file 822 assert(Obj.getBytesInAddress() == 4 && 823 "Invalid word size in object file"); 824 825 switch (Obj.getArch()) { 826 case Triple::x86: 827 return {supportsX86, resolveX86}; 828 case Triple::ppcle: 829 case Triple::ppc: 830 return {supportsPPC32, resolvePPC32}; 831 case Triple::arm: 832 case Triple::armeb: 833 return {supportsARM, resolveARM}; 834 case Triple::avr: 835 return {supportsAVR, resolveAVR}; 836 case Triple::lanai: 837 return {supportsLanai, resolveLanai}; 838 case Triple::loongarch32: 839 return {supportsLoongArch, resolveLoongArch}; 840 case Triple::mipsel: 841 case Triple::mips: 842 return {supportsMips32, resolveMips32}; 843 case Triple::msp430: 844 return {supportsMSP430, resolveMSP430}; 845 case Triple::sparc: 846 return {supportsSparc32, resolveSparc32}; 847 case Triple::hexagon: 848 return {supportsHexagon, resolveHexagon}; 849 case Triple::r600: 850 return {supportsAmdgpu, resolveAmdgpu}; 851 case Triple::riscv32: 852 return {supportsRISCV, resolveRISCV}; 853 case Triple::csky: 854 return {supportsCSKY, resolveCSKY}; 855 default: 856 if (isAMDGPU(Obj)) 857 return {supportsAmdgpu, resolveAmdgpu}; 858 return {nullptr, nullptr}; 859 } 860 } else if (Obj.isMachO()) { 861 if (Obj.getArch() == Triple::x86_64) 862 return {supportsMachOX86_64, resolveMachOX86_64}; 863 return {nullptr, nullptr}; 864 } else if (Obj.isWasm()) { 865 if (Obj.getArch() == Triple::wasm32) 866 return {supportsWasm32, resolveWasm32}; 867 if (Obj.getArch() == Triple::wasm64) 868 return {supportsWasm64, resolveWasm64}; 869 return {nullptr, nullptr}; 870 } 871 872 llvm_unreachable("Invalid object file"); 873 } 874 875 uint64_t resolveRelocation(RelocationResolver Resolver, const RelocationRef &R, 876 uint64_t S, uint64_t LocData) { 877 if (const ObjectFile *Obj = R.getObject()) { 878 int64_t Addend = 0; 879 if (Obj->isELF()) { 880 auto GetRelSectionType = [&]() -> unsigned { 881 if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj)) 882 return Elf32LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 883 if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj)) 884 return Elf64LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 885 if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj)) 886 return Elf32BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 887 auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj); 888 return Elf64BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 889 }; 890 891 if (GetRelSectionType() == ELF::SHT_RELA) { 892 Addend = getELFAddend(R); 893 // LoongArch and RISCV relocations use both LocData and Addend. 894 if (Obj->getArch() != Triple::loongarch32 && 895 Obj->getArch() != Triple::loongarch64 && 896 Obj->getArch() != Triple::riscv32 && 897 Obj->getArch() != Triple::riscv64) 898 LocData = 0; 899 } 900 } 901 902 return Resolver(R.getType(), R.getOffset(), S, LocData, Addend); 903 } 904 905 // Sometimes the caller might want to use its own specific implementation of 906 // the resolver function. E.g. this is used by LLD when it resolves debug 907 // relocations and assumes that all of them have the same computation (S + A). 908 // The relocation R has no owner object in this case and we don't need to 909 // provide Type and Offset fields. It is also assumed the DataRefImpl.p 910 // contains the addend, provided by the caller. 911 return Resolver(/*Type=*/0, /*Offset=*/0, S, LocData, 912 R.getRawDataRefImpl().p); 913 } 914 915 } // namespace object 916 } // namespace llvm 917