1 //===-- X86MachObjectWriter.cpp - X86 Mach-O Writer -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "MCTargetDesc/X86MCTargetDesc.h" 11 #include "MCTargetDesc/X86FixupKinds.h" 12 #include "llvm/ADT/Twine.h" 13 #include "llvm/MC/MCAsmInfo.h" 14 #include "llvm/MC/MCAsmLayout.h" 15 #include "llvm/MC/MCAssembler.h" 16 #include "llvm/MC/MCContext.h" 17 #include "llvm/MC/MCMachObjectWriter.h" 18 #include "llvm/MC/MCSectionMachO.h" 19 #include "llvm/MC/MCValue.h" 20 #include "llvm/Support/ErrorHandling.h" 21 #include "llvm/Support/Format.h" 22 #include "llvm/Support/MachO.h" 23 24 using namespace llvm; 25 26 namespace { 27 class X86MachObjectWriter : public MCMachObjectTargetWriter { 28 bool recordScatteredRelocation(MachObjectWriter *Writer, 29 const MCAssembler &Asm, 30 const MCAsmLayout &Layout, 31 const MCFragment *Fragment, 32 const MCFixup &Fixup, 33 MCValue Target, 34 unsigned Log2Size, 35 uint64_t &FixedValue); 36 void recordTLVPRelocation(MachObjectWriter *Writer, 37 const MCAssembler &Asm, 38 const MCAsmLayout &Layout, 39 const MCFragment *Fragment, 40 const MCFixup &Fixup, 41 MCValue Target, 42 uint64_t &FixedValue); 43 44 void RecordX86Relocation(MachObjectWriter *Writer, 45 const MCAssembler &Asm, 46 const MCAsmLayout &Layout, 47 const MCFragment *Fragment, 48 const MCFixup &Fixup, 49 MCValue Target, 50 uint64_t &FixedValue); 51 void RecordX86_64Relocation(MachObjectWriter *Writer, MCAssembler &Asm, 52 const MCAsmLayout &Layout, 53 const MCFragment *Fragment, const MCFixup &Fixup, 54 MCValue Target, uint64_t &FixedValue); 55 56 public: 57 X86MachObjectWriter(bool Is64Bit, uint32_t CPUType, uint32_t CPUSubtype) 58 : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {} 59 60 void recordRelocation(MachObjectWriter *Writer, MCAssembler &Asm, 61 const MCAsmLayout &Layout, const MCFragment *Fragment, 62 const MCFixup &Fixup, MCValue Target, 63 uint64_t &FixedValue) override { 64 if (Writer->is64Bit()) 65 RecordX86_64Relocation(Writer, Asm, Layout, Fragment, Fixup, Target, 66 FixedValue); 67 else 68 RecordX86Relocation(Writer, Asm, Layout, Fragment, Fixup, Target, 69 FixedValue); 70 } 71 }; 72 } 73 74 static bool isFixupKindRIPRel(unsigned Kind) { 75 return Kind == X86::reloc_riprel_4byte || 76 Kind == X86::reloc_riprel_4byte_movq_load; 77 } 78 79 static unsigned getFixupKindLog2Size(unsigned Kind) { 80 switch (Kind) { 81 default: 82 llvm_unreachable("invalid fixup kind!"); 83 case FK_PCRel_1: 84 case FK_Data_1: return 0; 85 case FK_PCRel_2: 86 case FK_Data_2: return 1; 87 case FK_PCRel_4: 88 // FIXME: Remove these!!! 89 case X86::reloc_riprel_4byte: 90 case X86::reloc_riprel_4byte_movq_load: 91 case X86::reloc_signed_4byte: 92 case FK_Data_4: return 2; 93 case FK_Data_8: return 3; 94 } 95 } 96 97 void X86MachObjectWriter::RecordX86_64Relocation( 98 MachObjectWriter *Writer, MCAssembler &Asm, const MCAsmLayout &Layout, 99 const MCFragment *Fragment, const MCFixup &Fixup, MCValue Target, 100 uint64_t &FixedValue) { 101 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 102 unsigned IsRIPRel = isFixupKindRIPRel(Fixup.getKind()); 103 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 104 105 // See <reloc.h>. 106 uint32_t FixupOffset = 107 Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 108 uint32_t FixupAddress = 109 Writer->getFragmentAddress(Fragment, Layout) + Fixup.getOffset(); 110 int64_t Value = 0; 111 unsigned Index = 0; 112 unsigned IsExtern = 0; 113 unsigned Type = 0; 114 const MCSymbol *RelSymbol = nullptr; 115 116 Value = Target.getConstant(); 117 118 if (IsPCRel) { 119 // Compensate for the relocation offset, Darwin x86_64 relocations only have 120 // the addend and appear to have attempted to define it to be the actual 121 // expression addend without the PCrel bias. However, instructions with data 122 // following the relocation are not accommodated for (see comment below 123 // regarding SIGNED{1,2,4}), so it isn't exactly that either. 124 Value += 1LL << Log2Size; 125 } 126 127 if (Target.isAbsolute()) { // constant 128 // SymbolNum of 0 indicates the absolute section. 129 Type = MachO::X86_64_RELOC_UNSIGNED; 130 131 // FIXME: I believe this is broken, I don't think the linker can understand 132 // it. I think it would require a local relocation, but I'm not sure if that 133 // would work either. The official way to get an absolute PCrel relocation 134 // is to use an absolute symbol (which we don't support yet). 135 if (IsPCRel) { 136 IsExtern = 1; 137 Type = MachO::X86_64_RELOC_BRANCH; 138 } 139 } else if (Target.getSymB()) { // A - B + constant 140 const MCSymbol *A = &Target.getSymA()->getSymbol(); 141 if (A->isTemporary()) 142 A = &Writer->findAliasedSymbol(*A); 143 const MCSymbol *A_Base = Asm.getAtom(*A); 144 145 const MCSymbol *B = &Target.getSymB()->getSymbol(); 146 if (B->isTemporary()) 147 B = &Writer->findAliasedSymbol(*B); 148 const MCSymbol *B_Base = Asm.getAtom(*B); 149 150 // Neither symbol can be modified. 151 if (Target.getSymA()->getKind() != MCSymbolRefExpr::VK_None || 152 Target.getSymB()->getKind() != MCSymbolRefExpr::VK_None) 153 report_fatal_error("unsupported relocation of modified symbol", false); 154 155 // We don't support PCrel relocations of differences. Darwin 'as' doesn't 156 // implement most of these correctly. 157 if (IsPCRel) 158 report_fatal_error("unsupported pc-relative relocation of difference", 159 false); 160 161 // The support for the situation where one or both of the symbols would 162 // require a local relocation is handled just like if the symbols were 163 // external. This is certainly used in the case of debug sections where the 164 // section has only temporary symbols and thus the symbols don't have base 165 // symbols. This is encoded using the section ordinal and non-extern 166 // relocation entries. 167 168 // Darwin 'as' doesn't emit correct relocations for this (it ends up with a 169 // single SIGNED relocation); reject it for now. Except the case where both 170 // symbols don't have a base, equal but both NULL. 171 if (A_Base == B_Base && A_Base) 172 report_fatal_error("unsupported relocation with identical base", false); 173 174 // A subtraction expression where either symbol is undefined is a 175 // non-relocatable expression. 176 if (A->isUndefined() || B->isUndefined()) { 177 StringRef Name = A->isUndefined() ? A->getName() : B->getName(); 178 Asm.getContext().reportFatalError(Fixup.getLoc(), 179 "unsupported relocation with subtraction expression, symbol '" + 180 Name + "' can not be undefined in a subtraction expression"); 181 } 182 183 Value += Writer->getSymbolAddress(*A, Layout) - 184 (!A_Base ? 0 : Writer->getSymbolAddress(*A_Base, Layout)); 185 Value -= Writer->getSymbolAddress(*B, Layout) - 186 (!B_Base ? 0 : Writer->getSymbolAddress(*B_Base, Layout)); 187 188 if (!A_Base) 189 Index = A->getFragment()->getParent()->getOrdinal() + 1; 190 Type = MachO::X86_64_RELOC_UNSIGNED; 191 192 MachO::any_relocation_info MRE; 193 MRE.r_word0 = FixupOffset; 194 MRE.r_word1 = 195 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28); 196 Writer->addRelocation(A_Base, Fragment->getParent(), MRE); 197 198 if (B_Base) 199 RelSymbol = B_Base; 200 else 201 Index = B->getFragment()->getParent()->getOrdinal() + 1; 202 Type = MachO::X86_64_RELOC_SUBTRACTOR; 203 } else { 204 const MCSymbol *Symbol = &Target.getSymA()->getSymbol(); 205 if (Symbol->isTemporary() && Value) { 206 const MCSection &Sec = Symbol->getSection(); 207 if (!Asm.getContext().getAsmInfo()->isSectionAtomizableBySymbols(Sec)) 208 Symbol->setUsedInReloc(); 209 } 210 RelSymbol = Asm.getAtom(*Symbol); 211 212 // Relocations inside debug sections always use local relocations when 213 // possible. This seems to be done because the debugger doesn't fully 214 // understand x86_64 relocation entries, and expects to find values that 215 // have already been fixed up. 216 if (Symbol->isInSection()) { 217 const MCSectionMachO &Section = 218 static_cast<const MCSectionMachO &>(*Fragment->getParent()); 219 if (Section.hasAttribute(MachO::S_ATTR_DEBUG)) 220 RelSymbol = nullptr; 221 } 222 223 // x86_64 almost always uses external relocations, except when there is no 224 // symbol to use as a base address (a local symbol with no preceding 225 // non-local symbol). 226 if (RelSymbol) { 227 // Add the local offset, if needed. 228 if (RelSymbol != Symbol) 229 Value += Layout.getSymbolOffset(*Symbol) - 230 Layout.getSymbolOffset(*RelSymbol); 231 } else if (Symbol->isInSection() && !Symbol->isVariable()) { 232 // The index is the section ordinal (1-based). 233 Index = Symbol->getFragment()->getParent()->getOrdinal() + 1; 234 Value += Writer->getSymbolAddress(*Symbol, Layout); 235 236 if (IsPCRel) 237 Value -= FixupAddress + (1 << Log2Size); 238 } else if (Symbol->isVariable()) { 239 const MCExpr *Value = Symbol->getVariableValue(); 240 int64_t Res; 241 bool isAbs = Value->evaluateAsAbsolute(Res, Layout, 242 Writer->getSectionAddressMap()); 243 if (isAbs) { 244 FixedValue = Res; 245 return; 246 } else { 247 report_fatal_error("unsupported relocation of variable '" + 248 Symbol->getName() + "'", false); 249 } 250 } else { 251 report_fatal_error("unsupported relocation of undefined symbol '" + 252 Symbol->getName() + "'", false); 253 } 254 255 MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 256 if (IsPCRel) { 257 if (IsRIPRel) { 258 if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 259 // x86_64 distinguishes movq foo@GOTPCREL so that the linker can 260 // rewrite the movq to an leaq at link time if the symbol ends up in 261 // the same linkage unit. 262 if (unsigned(Fixup.getKind()) == X86::reloc_riprel_4byte_movq_load) 263 Type = MachO::X86_64_RELOC_GOT_LOAD; 264 else 265 Type = MachO::X86_64_RELOC_GOT; 266 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 267 Type = MachO::X86_64_RELOC_TLV; 268 } else if (Modifier != MCSymbolRefExpr::VK_None) { 269 report_fatal_error("unsupported symbol modifier in relocation", 270 false); 271 } else { 272 Type = MachO::X86_64_RELOC_SIGNED; 273 274 // The Darwin x86_64 relocation format has a problem where it cannot 275 // encode an address (L<foo> + <constant>) which is outside the atom 276 // containing L<foo>. Generally, this shouldn't occur but it does 277 // happen when we have a RIPrel instruction with data following the 278 // relocation entry (e.g., movb $012, L0(%rip)). Even with the PCrel 279 // adjustment Darwin x86_64 uses, the offset is still negative and the 280 // linker has no way to recognize this. 281 // 282 // To work around this, Darwin uses several special relocation types 283 // to indicate the offsets. However, the specification or 284 // implementation of these seems to also be incomplete; they should 285 // adjust the addend as well based on the actual encoded instruction 286 // (the additional bias), but instead appear to just look at the final 287 // offset. 288 switch (-(Target.getConstant() + (1LL << Log2Size))) { 289 case 1: Type = MachO::X86_64_RELOC_SIGNED_1; break; 290 case 2: Type = MachO::X86_64_RELOC_SIGNED_2; break; 291 case 4: Type = MachO::X86_64_RELOC_SIGNED_4; break; 292 } 293 } 294 } else { 295 if (Modifier != MCSymbolRefExpr::VK_None) 296 report_fatal_error("unsupported symbol modifier in branch " 297 "relocation", false); 298 299 Type = MachO::X86_64_RELOC_BRANCH; 300 } 301 } else { 302 if (Modifier == MCSymbolRefExpr::VK_GOT) { 303 Type = MachO::X86_64_RELOC_GOT; 304 } else if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 305 // GOTPCREL is allowed as a modifier on non-PCrel instructions, in which 306 // case all we do is set the PCrel bit in the relocation entry; this is 307 // used with exception handling, for example. The source is required to 308 // include any necessary offset directly. 309 Type = MachO::X86_64_RELOC_GOT; 310 IsPCRel = 1; 311 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 312 report_fatal_error("TLVP symbol modifier should have been rip-rel", 313 false); 314 } else if (Modifier != MCSymbolRefExpr::VK_None) 315 report_fatal_error("unsupported symbol modifier in relocation", false); 316 else { 317 Type = MachO::X86_64_RELOC_UNSIGNED; 318 unsigned Kind = Fixup.getKind(); 319 if (Kind == X86::reloc_signed_4byte) 320 report_fatal_error("32-bit absolute addressing is not supported in " 321 "64-bit mode", false); 322 } 323 } 324 } 325 326 // x86_64 always writes custom values into the fixups. 327 FixedValue = Value; 328 329 // struct relocation_info (8 bytes) 330 MachO::any_relocation_info MRE; 331 MRE.r_word0 = FixupOffset; 332 MRE.r_word1 = (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | 333 (IsExtern << 27) | (Type << 28); 334 Writer->addRelocation(RelSymbol, Fragment->getParent(), MRE); 335 } 336 337 bool X86MachObjectWriter::recordScatteredRelocation(MachObjectWriter *Writer, 338 const MCAssembler &Asm, 339 const MCAsmLayout &Layout, 340 const MCFragment *Fragment, 341 const MCFixup &Fixup, 342 MCValue Target, 343 unsigned Log2Size, 344 uint64_t &FixedValue) { 345 uint64_t OriginalFixedValue = FixedValue; 346 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 347 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 348 unsigned Type = MachO::GENERIC_RELOC_VANILLA; 349 350 // See <reloc.h>. 351 const MCSymbol *A = &Target.getSymA()->getSymbol(); 352 353 if (!A->getFragment()) 354 report_fatal_error("symbol '" + A->getName() + 355 "' can not be undefined in a subtraction expression", 356 false); 357 358 uint32_t Value = Writer->getSymbolAddress(*A, Layout); 359 uint64_t SecAddr = Writer->getSectionAddress(A->getFragment()->getParent()); 360 FixedValue += SecAddr; 361 uint32_t Value2 = 0; 362 363 if (const MCSymbolRefExpr *B = Target.getSymB()) { 364 const MCSymbol *SB = &B->getSymbol(); 365 366 if (!SB->getFragment()) 367 report_fatal_error("symbol '" + B->getSymbol().getName() + 368 "' can not be undefined in a subtraction expression", 369 false); 370 371 // Select the appropriate difference relocation type. 372 // 373 // Note that there is no longer any semantic difference between these two 374 // relocation types from the linkers point of view, this is done solely for 375 // pedantic compatibility with 'as'. 376 Type = A->isExternal() ? (unsigned)MachO::GENERIC_RELOC_SECTDIFF 377 : (unsigned)MachO::GENERIC_RELOC_LOCAL_SECTDIFF; 378 Value2 = Writer->getSymbolAddress(B->getSymbol(), Layout); 379 FixedValue -= Writer->getSectionAddress(SB->getFragment()->getParent()); 380 } 381 382 // Relocations are written out in reverse order, so the PAIR comes first. 383 if (Type == MachO::GENERIC_RELOC_SECTDIFF || 384 Type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF) { 385 // If the offset is too large to fit in a scattered relocation, 386 // we're hosed. It's an unfortunate limitation of the MachO format. 387 if (FixupOffset > 0xffffff) { 388 char Buffer[32]; 389 format("0x%x", FixupOffset).print(Buffer, sizeof(Buffer)); 390 Asm.getContext().reportFatalError(Fixup.getLoc(), 391 Twine("Section too large, can't encode " 392 "r_address (") + Buffer + 393 ") into 24 bits of scattered " 394 "relocation entry."); 395 llvm_unreachable("fatal error returned?!"); 396 } 397 398 MachO::any_relocation_info MRE; 399 MRE.r_word0 = ((0 << 0) | // r_address 400 (MachO::GENERIC_RELOC_PAIR << 24) | // r_type 401 (Log2Size << 28) | 402 (IsPCRel << 30) | 403 MachO::R_SCATTERED); 404 MRE.r_word1 = Value2; 405 Writer->addRelocation(nullptr, Fragment->getParent(), MRE); 406 } else { 407 // If the offset is more than 24-bits, it won't fit in a scattered 408 // relocation offset field, so we fall back to using a non-scattered 409 // relocation. This is a bit risky, as if the offset reaches out of 410 // the block and the linker is doing scattered loading on this 411 // symbol, things can go badly. 412 // 413 // Required for 'as' compatibility. 414 if (FixupOffset > 0xffffff) { 415 FixedValue = OriginalFixedValue; 416 return false; 417 } 418 } 419 420 MachO::any_relocation_info MRE; 421 MRE.r_word0 = ((FixupOffset << 0) | 422 (Type << 24) | 423 (Log2Size << 28) | 424 (IsPCRel << 30) | 425 MachO::R_SCATTERED); 426 MRE.r_word1 = Value; 427 Writer->addRelocation(nullptr, Fragment->getParent(), MRE); 428 return true; 429 } 430 431 void X86MachObjectWriter::recordTLVPRelocation(MachObjectWriter *Writer, 432 const MCAssembler &Asm, 433 const MCAsmLayout &Layout, 434 const MCFragment *Fragment, 435 const MCFixup &Fixup, 436 MCValue Target, 437 uint64_t &FixedValue) { 438 assert(Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP && 439 !is64Bit() && 440 "Should only be called with a 32-bit TLVP relocation!"); 441 442 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 443 uint32_t Value = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 444 unsigned IsPCRel = 0; 445 446 // We're only going to have a second symbol in pic mode and it'll be a 447 // subtraction from the picbase. For 32-bit pic the addend is the difference 448 // between the picbase and the next address. For 32-bit static the addend is 449 // zero. 450 if (Target.getSymB()) { 451 // If this is a subtraction then we're pcrel. 452 uint32_t FixupAddress = 453 Writer->getFragmentAddress(Fragment, Layout) + Fixup.getOffset(); 454 IsPCRel = 1; 455 FixedValue = 456 FixupAddress - 457 Writer->getSymbolAddress(Target.getSymB()->getSymbol(), Layout) + 458 Target.getConstant(); 459 FixedValue += 1ULL << Log2Size; 460 } else { 461 FixedValue = 0; 462 } 463 464 // struct relocation_info (8 bytes) 465 MachO::any_relocation_info MRE; 466 MRE.r_word0 = Value; 467 MRE.r_word1 = 468 (IsPCRel << 24) | (Log2Size << 25) | (MachO::GENERIC_RELOC_TLV << 28); 469 Writer->addRelocation(&Target.getSymA()->getSymbol(), Fragment->getParent(), 470 MRE); 471 } 472 473 void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer, 474 const MCAssembler &Asm, 475 const MCAsmLayout &Layout, 476 const MCFragment *Fragment, 477 const MCFixup &Fixup, 478 MCValue Target, 479 uint64_t &FixedValue) { 480 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 481 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 482 483 // If this is a 32-bit TLVP reloc it's handled a bit differently. 484 if (Target.getSymA() && 485 Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP) { 486 recordTLVPRelocation(Writer, Asm, Layout, Fragment, Fixup, Target, 487 FixedValue); 488 return; 489 } 490 491 // If this is a difference or a defined symbol plus an offset, then we need a 492 // scattered relocation entry. Differences always require scattered 493 // relocations. 494 if (Target.getSymB()) { 495 recordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, 496 Target, Log2Size, FixedValue); 497 return; 498 } 499 500 // Get the symbol data, if any. 501 const MCSymbol *A = nullptr; 502 if (Target.getSymA()) 503 A = &Target.getSymA()->getSymbol(); 504 505 // If this is an internal relocation with an offset, it also needs a scattered 506 // relocation entry. 507 uint32_t Offset = Target.getConstant(); 508 if (IsPCRel) 509 Offset += 1 << Log2Size; 510 // Try to record the scattered relocation if needed. Fall back to non 511 // scattered if necessary (see comments in recordScatteredRelocation() 512 // for details). 513 if (Offset && A && !Writer->doesSymbolRequireExternRelocation(*A) && 514 recordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, Target, 515 Log2Size, FixedValue)) 516 return; 517 518 // See <reloc.h>. 519 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 520 unsigned Index = 0; 521 unsigned Type = 0; 522 const MCSymbol *RelSymbol = nullptr; 523 524 if (Target.isAbsolute()) { // constant 525 // SymbolNum of 0 indicates the absolute section. 526 // 527 // FIXME: Currently, these are never generated (see code below). I cannot 528 // find a case where they are actually emitted. 529 Type = MachO::GENERIC_RELOC_VANILLA; 530 } else { 531 // Resolve constant variables. 532 if (A->isVariable()) { 533 int64_t Res; 534 if (A->getVariableValue()->evaluateAsAbsolute( 535 Res, Layout, Writer->getSectionAddressMap())) { 536 FixedValue = Res; 537 return; 538 } 539 } 540 541 // Check whether we need an external or internal relocation. 542 if (Writer->doesSymbolRequireExternRelocation(*A)) { 543 RelSymbol = A; 544 // For external relocations, make sure to offset the fixup value to 545 // compensate for the addend of the symbol address, if it was 546 // undefined. This occurs with weak definitions, for example. 547 if (!A->isUndefined()) 548 FixedValue -= Layout.getSymbolOffset(*A); 549 } else { 550 // The index is the section ordinal (1-based). 551 const MCSection &Sec = A->getSection(); 552 Index = Sec.getOrdinal() + 1; 553 FixedValue += Writer->getSectionAddress(&Sec); 554 } 555 if (IsPCRel) 556 FixedValue -= Writer->getSectionAddress(Fragment->getParent()); 557 558 Type = MachO::GENERIC_RELOC_VANILLA; 559 } 560 561 // struct relocation_info (8 bytes) 562 MachO::any_relocation_info MRE; 563 MRE.r_word0 = FixupOffset; 564 MRE.r_word1 = 565 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28); 566 Writer->addRelocation(RelSymbol, Fragment->getParent(), MRE); 567 } 568 569 MCObjectWriter *llvm::createX86MachObjectWriter(raw_pwrite_stream &OS, 570 bool Is64Bit, uint32_t CPUType, 571 uint32_t CPUSubtype) { 572 return createMachObjectWriter(new X86MachObjectWriter(Is64Bit, 573 CPUType, 574 CPUSubtype), 575 OS, /*IsLittleEndian=*/true); 576 } 577