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_SUB6: 437 case ELF::R_RISCV_ADD8: 438 case ELF::R_RISCV_SUB8: 439 case ELF::R_RISCV_ADD16: 440 case ELF::R_RISCV_SUB16: 441 case ELF::R_RISCV_ADD32: 442 case ELF::R_RISCV_SUB32: 443 case ELF::R_RISCV_ADD64: 444 case ELF::R_RISCV_SUB64: 445 return true; 446 default: 447 return false; 448 } 449 } 450 451 static uint64_t resolveRISCV(uint64_t Type, uint64_t Offset, uint64_t S, 452 uint64_t LocData, int64_t Addend) { 453 int64_t RA = Addend; 454 uint64_t A = LocData; 455 switch (Type) { 456 case ELF::R_RISCV_NONE: 457 return LocData; 458 case ELF::R_RISCV_32: 459 return (S + RA) & 0xFFFFFFFF; 460 case ELF::R_RISCV_32_PCREL: 461 return (S + RA - Offset) & 0xFFFFFFFF; 462 case ELF::R_RISCV_64: 463 return S + RA; 464 case ELF::R_RISCV_SET6: 465 return (A & 0xC0) | ((S + RA) & 0x3F); 466 case ELF::R_RISCV_SUB6: 467 return (A & 0xC0) | (((A & 0x3F) - (S + RA)) & 0x3F); 468 case ELF::R_RISCV_ADD8: 469 return (A + (S + RA)) & 0xFF; 470 case ELF::R_RISCV_SUB8: 471 return (A - (S + RA)) & 0xFF; 472 case ELF::R_RISCV_ADD16: 473 return (A + (S + RA)) & 0xFFFF; 474 case ELF::R_RISCV_SUB16: 475 return (A - (S + RA)) & 0xFFFF; 476 case ELF::R_RISCV_ADD32: 477 return (A + (S + RA)) & 0xFFFFFFFF; 478 case ELF::R_RISCV_SUB32: 479 return (A - (S + RA)) & 0xFFFFFFFF; 480 case ELF::R_RISCV_ADD64: 481 return (A + (S + RA)); 482 case ELF::R_RISCV_SUB64: 483 return (A - (S + RA)); 484 default: 485 llvm_unreachable("Invalid relocation type"); 486 } 487 } 488 489 static bool supportsCSKY(uint64_t Type) { 490 switch (Type) { 491 case ELF::R_CKCORE_NONE: 492 case ELF::R_CKCORE_ADDR32: 493 case ELF::R_CKCORE_PCREL32: 494 return true; 495 default: 496 return false; 497 } 498 } 499 500 static uint64_t resolveCSKY(uint64_t Type, uint64_t Offset, uint64_t S, 501 uint64_t LocData, int64_t Addend) { 502 switch (Type) { 503 case ELF::R_CKCORE_NONE: 504 return LocData; 505 case ELF::R_CKCORE_ADDR32: 506 return (S + Addend) & 0xFFFFFFFF; 507 case ELF::R_CKCORE_PCREL32: 508 return (S + Addend - Offset) & 0xFFFFFFFF; 509 default: 510 llvm_unreachable("Invalid relocation type"); 511 } 512 } 513 514 static bool supportsCOFFX86(uint64_t Type) { 515 switch (Type) { 516 case COFF::IMAGE_REL_I386_SECREL: 517 case COFF::IMAGE_REL_I386_DIR32: 518 return true; 519 default: 520 return false; 521 } 522 } 523 524 static uint64_t resolveCOFFX86(uint64_t Type, uint64_t Offset, uint64_t S, 525 uint64_t LocData, int64_t /*Addend*/) { 526 switch (Type) { 527 case COFF::IMAGE_REL_I386_SECREL: 528 case COFF::IMAGE_REL_I386_DIR32: 529 return (S + LocData) & 0xFFFFFFFF; 530 default: 531 llvm_unreachable("Invalid relocation type"); 532 } 533 } 534 535 static bool supportsCOFFX86_64(uint64_t Type) { 536 switch (Type) { 537 case COFF::IMAGE_REL_AMD64_SECREL: 538 case COFF::IMAGE_REL_AMD64_ADDR64: 539 return true; 540 default: 541 return false; 542 } 543 } 544 545 static uint64_t resolveCOFFX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 546 uint64_t LocData, int64_t /*Addend*/) { 547 switch (Type) { 548 case COFF::IMAGE_REL_AMD64_SECREL: 549 return (S + LocData) & 0xFFFFFFFF; 550 case COFF::IMAGE_REL_AMD64_ADDR64: 551 return S + LocData; 552 default: 553 llvm_unreachable("Invalid relocation type"); 554 } 555 } 556 557 static bool supportsCOFFARM(uint64_t Type) { 558 switch (Type) { 559 case COFF::IMAGE_REL_ARM_SECREL: 560 case COFF::IMAGE_REL_ARM_ADDR32: 561 return true; 562 default: 563 return false; 564 } 565 } 566 567 static uint64_t resolveCOFFARM(uint64_t Type, uint64_t Offset, uint64_t S, 568 uint64_t LocData, int64_t /*Addend*/) { 569 switch (Type) { 570 case COFF::IMAGE_REL_ARM_SECREL: 571 case COFF::IMAGE_REL_ARM_ADDR32: 572 return (S + LocData) & 0xFFFFFFFF; 573 default: 574 llvm_unreachable("Invalid relocation type"); 575 } 576 } 577 578 static bool supportsCOFFARM64(uint64_t Type) { 579 switch (Type) { 580 case COFF::IMAGE_REL_ARM64_SECREL: 581 case COFF::IMAGE_REL_ARM64_ADDR64: 582 return true; 583 default: 584 return false; 585 } 586 } 587 588 static uint64_t resolveCOFFARM64(uint64_t Type, uint64_t Offset, uint64_t S, 589 uint64_t LocData, int64_t /*Addend*/) { 590 switch (Type) { 591 case COFF::IMAGE_REL_ARM64_SECREL: 592 return (S + LocData) & 0xFFFFFFFF; 593 case COFF::IMAGE_REL_ARM64_ADDR64: 594 return S + LocData; 595 default: 596 llvm_unreachable("Invalid relocation type"); 597 } 598 } 599 600 static bool supportsMachOX86_64(uint64_t Type) { 601 return Type == MachO::X86_64_RELOC_UNSIGNED; 602 } 603 604 static uint64_t resolveMachOX86_64(uint64_t Type, uint64_t Offset, uint64_t S, 605 uint64_t LocData, int64_t /*Addend*/) { 606 if (Type == MachO::X86_64_RELOC_UNSIGNED) 607 return S; 608 llvm_unreachable("Invalid relocation type"); 609 } 610 611 static bool supportsWasm32(uint64_t Type) { 612 switch (Type) { 613 case wasm::R_WASM_FUNCTION_INDEX_LEB: 614 case wasm::R_WASM_TABLE_INDEX_SLEB: 615 case wasm::R_WASM_TABLE_INDEX_I32: 616 case wasm::R_WASM_MEMORY_ADDR_LEB: 617 case wasm::R_WASM_MEMORY_ADDR_SLEB: 618 case wasm::R_WASM_MEMORY_ADDR_I32: 619 case wasm::R_WASM_TYPE_INDEX_LEB: 620 case wasm::R_WASM_GLOBAL_INDEX_LEB: 621 case wasm::R_WASM_FUNCTION_OFFSET_I32: 622 case wasm::R_WASM_SECTION_OFFSET_I32: 623 case wasm::R_WASM_TAG_INDEX_LEB: 624 case wasm::R_WASM_GLOBAL_INDEX_I32: 625 case wasm::R_WASM_TABLE_NUMBER_LEB: 626 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 627 return true; 628 default: 629 return false; 630 } 631 } 632 633 static bool supportsWasm64(uint64_t Type) { 634 switch (Type) { 635 case wasm::R_WASM_MEMORY_ADDR_LEB64: 636 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 637 case wasm::R_WASM_MEMORY_ADDR_I64: 638 case wasm::R_WASM_TABLE_INDEX_SLEB64: 639 case wasm::R_WASM_TABLE_INDEX_I64: 640 case wasm::R_WASM_FUNCTION_OFFSET_I64: 641 return true; 642 default: 643 return supportsWasm32(Type); 644 } 645 } 646 647 static uint64_t resolveWasm32(uint64_t Type, uint64_t Offset, uint64_t S, 648 uint64_t LocData, int64_t /*Addend*/) { 649 switch (Type) { 650 case wasm::R_WASM_FUNCTION_INDEX_LEB: 651 case wasm::R_WASM_TABLE_INDEX_SLEB: 652 case wasm::R_WASM_TABLE_INDEX_I32: 653 case wasm::R_WASM_MEMORY_ADDR_LEB: 654 case wasm::R_WASM_MEMORY_ADDR_SLEB: 655 case wasm::R_WASM_MEMORY_ADDR_I32: 656 case wasm::R_WASM_TYPE_INDEX_LEB: 657 case wasm::R_WASM_GLOBAL_INDEX_LEB: 658 case wasm::R_WASM_FUNCTION_OFFSET_I32: 659 case wasm::R_WASM_SECTION_OFFSET_I32: 660 case wasm::R_WASM_TAG_INDEX_LEB: 661 case wasm::R_WASM_GLOBAL_INDEX_I32: 662 case wasm::R_WASM_TABLE_NUMBER_LEB: 663 case wasm::R_WASM_MEMORY_ADDR_LOCREL_I32: 664 // For wasm section, its offset at 0 -- ignoring Value 665 return LocData; 666 default: 667 llvm_unreachable("Invalid relocation type"); 668 } 669 } 670 671 static uint64_t resolveWasm64(uint64_t Type, uint64_t Offset, uint64_t S, 672 uint64_t LocData, int64_t Addend) { 673 switch (Type) { 674 case wasm::R_WASM_MEMORY_ADDR_LEB64: 675 case wasm::R_WASM_MEMORY_ADDR_SLEB64: 676 case wasm::R_WASM_MEMORY_ADDR_I64: 677 case wasm::R_WASM_TABLE_INDEX_SLEB64: 678 case wasm::R_WASM_TABLE_INDEX_I64: 679 case wasm::R_WASM_FUNCTION_OFFSET_I64: 680 // For wasm section, its offset at 0 -- ignoring Value 681 return LocData; 682 default: 683 return resolveWasm32(Type, Offset, S, LocData, Addend); 684 } 685 } 686 687 std::pair<SupportsRelocation, RelocationResolver> 688 getRelocationResolver(const ObjectFile &Obj) { 689 if (Obj.isCOFF()) { 690 switch (Obj.getArch()) { 691 case Triple::x86_64: 692 return {supportsCOFFX86_64, resolveCOFFX86_64}; 693 case Triple::x86: 694 return {supportsCOFFX86, resolveCOFFX86}; 695 case Triple::arm: 696 case Triple::thumb: 697 return {supportsCOFFARM, resolveCOFFARM}; 698 case Triple::aarch64: 699 return {supportsCOFFARM64, resolveCOFFARM64}; 700 default: 701 return {nullptr, nullptr}; 702 } 703 } else if (Obj.isELF()) { 704 if (Obj.getBytesInAddress() == 8) { 705 switch (Obj.getArch()) { 706 case Triple::x86_64: 707 return {supportsX86_64, resolveX86_64}; 708 case Triple::aarch64: 709 case Triple::aarch64_be: 710 return {supportsAArch64, resolveAArch64}; 711 case Triple::bpfel: 712 case Triple::bpfeb: 713 return {supportsBPF, resolveBPF}; 714 case Triple::mips64el: 715 case Triple::mips64: 716 return {supportsMips64, resolveMips64}; 717 case Triple::ppc64le: 718 case Triple::ppc64: 719 return {supportsPPC64, resolvePPC64}; 720 case Triple::systemz: 721 return {supportsSystemZ, resolveSystemZ}; 722 case Triple::sparcv9: 723 return {supportsSparc64, resolveSparc64}; 724 case Triple::amdgcn: 725 return {supportsAmdgpu, resolveAmdgpu}; 726 case Triple::riscv64: 727 return {supportsRISCV, resolveRISCV}; 728 default: 729 return {nullptr, nullptr}; 730 } 731 } 732 733 // 32-bit object file 734 assert(Obj.getBytesInAddress() == 4 && 735 "Invalid word size in object file"); 736 737 switch (Obj.getArch()) { 738 case Triple::x86: 739 return {supportsX86, resolveX86}; 740 case Triple::ppcle: 741 case Triple::ppc: 742 return {supportsPPC32, resolvePPC32}; 743 case Triple::arm: 744 case Triple::armeb: 745 return {supportsARM, resolveARM}; 746 case Triple::avr: 747 return {supportsAVR, resolveAVR}; 748 case Triple::lanai: 749 return {supportsLanai, resolveLanai}; 750 case Triple::mipsel: 751 case Triple::mips: 752 return {supportsMips32, resolveMips32}; 753 case Triple::msp430: 754 return {supportsMSP430, resolveMSP430}; 755 case Triple::sparc: 756 return {supportsSparc32, resolveSparc32}; 757 case Triple::hexagon: 758 return {supportsHexagon, resolveHexagon}; 759 case Triple::riscv32: 760 return {supportsRISCV, resolveRISCV}; 761 case Triple::csky: 762 return {supportsCSKY, resolveCSKY}; 763 default: 764 return {nullptr, nullptr}; 765 } 766 } else if (Obj.isMachO()) { 767 if (Obj.getArch() == Triple::x86_64) 768 return {supportsMachOX86_64, resolveMachOX86_64}; 769 return {nullptr, nullptr}; 770 } else if (Obj.isWasm()) { 771 if (Obj.getArch() == Triple::wasm32) 772 return {supportsWasm32, resolveWasm32}; 773 if (Obj.getArch() == Triple::wasm64) 774 return {supportsWasm64, resolveWasm64}; 775 return {nullptr, nullptr}; 776 } 777 778 llvm_unreachable("Invalid object file"); 779 } 780 781 uint64_t resolveRelocation(RelocationResolver Resolver, const RelocationRef &R, 782 uint64_t S, uint64_t LocData) { 783 if (const ObjectFile *Obj = R.getObject()) { 784 int64_t Addend = 0; 785 if (Obj->isELF()) { 786 auto GetRelSectionType = [&]() -> unsigned { 787 if (auto *Elf32LEObj = dyn_cast<ELF32LEObjectFile>(Obj)) 788 return Elf32LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 789 if (auto *Elf64LEObj = dyn_cast<ELF64LEObjectFile>(Obj)) 790 return Elf64LEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 791 if (auto *Elf32BEObj = dyn_cast<ELF32BEObjectFile>(Obj)) 792 return Elf32BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 793 auto *Elf64BEObj = cast<ELF64BEObjectFile>(Obj); 794 return Elf64BEObj->getRelSection(R.getRawDataRefImpl())->sh_type; 795 }; 796 797 if (GetRelSectionType() == ELF::SHT_RELA) { 798 Addend = getELFAddend(R); 799 // RISCV relocations use both LocData and Addend. 800 if (Obj->getArch() != Triple::riscv32 && 801 Obj->getArch() != Triple::riscv64) 802 LocData = 0; 803 } 804 } 805 806 return Resolver(R.getType(), R.getOffset(), S, LocData, Addend); 807 } 808 809 // Sometimes the caller might want to use its own specific implementation of 810 // the resolver function. E.g. this is used by LLD when it resolves debug 811 // relocations and assumes that all of them have the same computation (S + A). 812 // The relocation R has no owner object in this case and we don't need to 813 // provide Type and Offset fields. It is also assumed the DataRefImpl.p 814 // contains the addend, provided by the caller. 815 return Resolver(/*Type=*/0, /*Offset=*/0, S, LocData, 816 R.getRawDataRefImpl().p); 817 } 818 819 } // namespace object 820 } // namespace llvm 821