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().reportError(Fixup.getLoc(), 179 "unsupported relocation with subtraction expression, symbol '" + 180 Name + "' can not be undefined in a subtraction expression"); 181 return; 182 } 183 184 Value += Writer->getSymbolAddress(*A, Layout) - 185 (!A_Base ? 0 : Writer->getSymbolAddress(*A_Base, Layout)); 186 Value -= Writer->getSymbolAddress(*B, Layout) - 187 (!B_Base ? 0 : Writer->getSymbolAddress(*B_Base, Layout)); 188 189 if (!A_Base) 190 Index = A->getFragment()->getParent()->getOrdinal() + 1; 191 Type = MachO::X86_64_RELOC_UNSIGNED; 192 193 MachO::any_relocation_info MRE; 194 MRE.r_word0 = FixupOffset; 195 MRE.r_word1 = 196 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28); 197 Writer->addRelocation(A_Base, Fragment->getParent(), MRE); 198 199 if (B_Base) 200 RelSymbol = B_Base; 201 else 202 Index = B->getFragment()->getParent()->getOrdinal() + 1; 203 Type = MachO::X86_64_RELOC_SUBTRACTOR; 204 } else { 205 const MCSymbol *Symbol = &Target.getSymA()->getSymbol(); 206 if (Symbol->isTemporary() && Value) { 207 const MCSection &Sec = Symbol->getSection(); 208 if (!Asm.getContext().getAsmInfo()->isSectionAtomizableBySymbols(Sec)) 209 Symbol->setUsedInReloc(); 210 } 211 RelSymbol = Asm.getAtom(*Symbol); 212 213 // Relocations inside debug sections always use local relocations when 214 // possible. This seems to be done because the debugger doesn't fully 215 // understand x86_64 relocation entries, and expects to find values that 216 // have already been fixed up. 217 if (Symbol->isInSection()) { 218 const MCSectionMachO &Section = 219 static_cast<const MCSectionMachO &>(*Fragment->getParent()); 220 if (Section.hasAttribute(MachO::S_ATTR_DEBUG)) 221 RelSymbol = nullptr; 222 } 223 224 // x86_64 almost always uses external relocations, except when there is no 225 // symbol to use as a base address (a local symbol with no preceding 226 // non-local symbol). 227 if (RelSymbol) { 228 // Add the local offset, if needed. 229 if (RelSymbol != Symbol) 230 Value += Layout.getSymbolOffset(*Symbol) - 231 Layout.getSymbolOffset(*RelSymbol); 232 } else if (Symbol->isInSection() && !Symbol->isVariable()) { 233 // The index is the section ordinal (1-based). 234 Index = Symbol->getFragment()->getParent()->getOrdinal() + 1; 235 Value += Writer->getSymbolAddress(*Symbol, Layout); 236 237 if (IsPCRel) 238 Value -= FixupAddress + (1 << Log2Size); 239 } else if (Symbol->isVariable()) { 240 const MCExpr *Value = Symbol->getVariableValue(); 241 int64_t Res; 242 bool isAbs = Value->evaluateAsAbsolute(Res, Layout, 243 Writer->getSectionAddressMap()); 244 if (isAbs) { 245 FixedValue = Res; 246 return; 247 } else { 248 report_fatal_error("unsupported relocation of variable '" + 249 Symbol->getName() + "'", false); 250 } 251 } else { 252 report_fatal_error("unsupported relocation of undefined symbol '" + 253 Symbol->getName() + "'", false); 254 } 255 256 MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 257 if (IsPCRel) { 258 if (IsRIPRel) { 259 if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 260 // x86_64 distinguishes movq foo@GOTPCREL so that the linker can 261 // rewrite the movq to an leaq at link time if the symbol ends up in 262 // the same linkage unit. 263 if (unsigned(Fixup.getKind()) == X86::reloc_riprel_4byte_movq_load) 264 Type = MachO::X86_64_RELOC_GOT_LOAD; 265 else 266 Type = MachO::X86_64_RELOC_GOT; 267 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 268 Type = MachO::X86_64_RELOC_TLV; 269 } else if (Modifier != MCSymbolRefExpr::VK_None) { 270 report_fatal_error("unsupported symbol modifier in relocation", 271 false); 272 } else { 273 Type = MachO::X86_64_RELOC_SIGNED; 274 275 // The Darwin x86_64 relocation format has a problem where it cannot 276 // encode an address (L<foo> + <constant>) which is outside the atom 277 // containing L<foo>. Generally, this shouldn't occur but it does 278 // happen when we have a RIPrel instruction with data following the 279 // relocation entry (e.g., movb $012, L0(%rip)). Even with the PCrel 280 // adjustment Darwin x86_64 uses, the offset is still negative and the 281 // linker has no way to recognize this. 282 // 283 // To work around this, Darwin uses several special relocation types 284 // to indicate the offsets. However, the specification or 285 // implementation of these seems to also be incomplete; they should 286 // adjust the addend as well based on the actual encoded instruction 287 // (the additional bias), but instead appear to just look at the final 288 // offset. 289 switch (-(Target.getConstant() + (1LL << Log2Size))) { 290 case 1: Type = MachO::X86_64_RELOC_SIGNED_1; break; 291 case 2: Type = MachO::X86_64_RELOC_SIGNED_2; break; 292 case 4: Type = MachO::X86_64_RELOC_SIGNED_4; break; 293 } 294 } 295 } else { 296 if (Modifier != MCSymbolRefExpr::VK_None) 297 report_fatal_error("unsupported symbol modifier in branch " 298 "relocation", false); 299 300 Type = MachO::X86_64_RELOC_BRANCH; 301 } 302 } else { 303 if (Modifier == MCSymbolRefExpr::VK_GOT) { 304 Type = MachO::X86_64_RELOC_GOT; 305 } else if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 306 // GOTPCREL is allowed as a modifier on non-PCrel instructions, in which 307 // case all we do is set the PCrel bit in the relocation entry; this is 308 // used with exception handling, for example. The source is required to 309 // include any necessary offset directly. 310 Type = MachO::X86_64_RELOC_GOT; 311 IsPCRel = 1; 312 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 313 report_fatal_error("TLVP symbol modifier should have been rip-rel", 314 false); 315 } else if (Modifier != MCSymbolRefExpr::VK_None) 316 report_fatal_error("unsupported symbol modifier in relocation", false); 317 else { 318 Type = MachO::X86_64_RELOC_UNSIGNED; 319 unsigned Kind = Fixup.getKind(); 320 if (Kind == X86::reloc_signed_4byte) 321 report_fatal_error("32-bit absolute addressing is not supported in " 322 "64-bit mode", false); 323 } 324 } 325 } 326 327 // x86_64 always writes custom values into the fixups. 328 FixedValue = Value; 329 330 // struct relocation_info (8 bytes) 331 MachO::any_relocation_info MRE; 332 MRE.r_word0 = FixupOffset; 333 MRE.r_word1 = (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | 334 (IsExtern << 27) | (Type << 28); 335 Writer->addRelocation(RelSymbol, Fragment->getParent(), MRE); 336 } 337 338 bool X86MachObjectWriter::recordScatteredRelocation(MachObjectWriter *Writer, 339 const MCAssembler &Asm, 340 const MCAsmLayout &Layout, 341 const MCFragment *Fragment, 342 const MCFixup &Fixup, 343 MCValue Target, 344 unsigned Log2Size, 345 uint64_t &FixedValue) { 346 uint64_t OriginalFixedValue = FixedValue; 347 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 348 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 349 unsigned Type = MachO::GENERIC_RELOC_VANILLA; 350 351 // See <reloc.h>. 352 const MCSymbol *A = &Target.getSymA()->getSymbol(); 353 354 if (!A->getFragment()) 355 report_fatal_error("symbol '" + A->getName() + 356 "' can not be undefined in a subtraction expression", 357 false); 358 359 uint32_t Value = Writer->getSymbolAddress(*A, Layout); 360 uint64_t SecAddr = Writer->getSectionAddress(A->getFragment()->getParent()); 361 FixedValue += SecAddr; 362 uint32_t Value2 = 0; 363 364 if (const MCSymbolRefExpr *B = Target.getSymB()) { 365 const MCSymbol *SB = &B->getSymbol(); 366 367 if (!SB->getFragment()) 368 report_fatal_error("symbol '" + B->getSymbol().getName() + 369 "' can not be undefined in a subtraction expression", 370 false); 371 372 // Select the appropriate difference relocation type. 373 // 374 // Note that there is no longer any semantic difference between these two 375 // relocation types from the linkers point of view, this is done solely for 376 // pedantic compatibility with 'as'. 377 Type = A->isExternal() ? (unsigned)MachO::GENERIC_RELOC_SECTDIFF 378 : (unsigned)MachO::GENERIC_RELOC_LOCAL_SECTDIFF; 379 Value2 = Writer->getSymbolAddress(B->getSymbol(), Layout); 380 FixedValue -= Writer->getSectionAddress(SB->getFragment()->getParent()); 381 } 382 383 // Relocations are written out in reverse order, so the PAIR comes first. 384 if (Type == MachO::GENERIC_RELOC_SECTDIFF || 385 Type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF) { 386 // If the offset is too large to fit in a scattered relocation, 387 // we're hosed. It's an unfortunate limitation of the MachO format. 388 if (FixupOffset > 0xffffff) { 389 char Buffer[32]; 390 format("0x%x", FixupOffset).print(Buffer, sizeof(Buffer)); 391 Asm.getContext().reportError(Fixup.getLoc(), 392 Twine("Section too large, can't encode " 393 "r_address (") + Buffer + 394 ") into 24 bits of scattered " 395 "relocation entry."); 396 return false; 397 } 398 399 MachO::any_relocation_info MRE; 400 MRE.r_word0 = ((0 << 0) | // r_address 401 (MachO::GENERIC_RELOC_PAIR << 24) | // r_type 402 (Log2Size << 28) | 403 (IsPCRel << 30) | 404 MachO::R_SCATTERED); 405 MRE.r_word1 = Value2; 406 Writer->addRelocation(nullptr, Fragment->getParent(), MRE); 407 } else { 408 // If the offset is more than 24-bits, it won't fit in a scattered 409 // relocation offset field, so we fall back to using a non-scattered 410 // relocation. This is a bit risky, as if the offset reaches out of 411 // the block and the linker is doing scattered loading on this 412 // symbol, things can go badly. 413 // 414 // Required for 'as' compatibility. 415 if (FixupOffset > 0xffffff) { 416 FixedValue = OriginalFixedValue; 417 return false; 418 } 419 } 420 421 MachO::any_relocation_info MRE; 422 MRE.r_word0 = ((FixupOffset << 0) | 423 (Type << 24) | 424 (Log2Size << 28) | 425 (IsPCRel << 30) | 426 MachO::R_SCATTERED); 427 MRE.r_word1 = Value; 428 Writer->addRelocation(nullptr, Fragment->getParent(), MRE); 429 return true; 430 } 431 432 void X86MachObjectWriter::recordTLVPRelocation(MachObjectWriter *Writer, 433 const MCAssembler &Asm, 434 const MCAsmLayout &Layout, 435 const MCFragment *Fragment, 436 const MCFixup &Fixup, 437 MCValue Target, 438 uint64_t &FixedValue) { 439 assert(Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP && 440 !is64Bit() && 441 "Should only be called with a 32-bit TLVP relocation!"); 442 443 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 444 uint32_t Value = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 445 unsigned IsPCRel = 0; 446 447 // We're only going to have a second symbol in pic mode and it'll be a 448 // subtraction from the picbase. For 32-bit pic the addend is the difference 449 // between the picbase and the next address. For 32-bit static the addend is 450 // zero. 451 if (Target.getSymB()) { 452 // If this is a subtraction then we're pcrel. 453 uint32_t FixupAddress = 454 Writer->getFragmentAddress(Fragment, Layout) + Fixup.getOffset(); 455 IsPCRel = 1; 456 FixedValue = 457 FixupAddress - 458 Writer->getSymbolAddress(Target.getSymB()->getSymbol(), Layout) + 459 Target.getConstant(); 460 FixedValue += 1ULL << Log2Size; 461 } else { 462 FixedValue = 0; 463 } 464 465 // struct relocation_info (8 bytes) 466 MachO::any_relocation_info MRE; 467 MRE.r_word0 = Value; 468 MRE.r_word1 = 469 (IsPCRel << 24) | (Log2Size << 25) | (MachO::GENERIC_RELOC_TLV << 28); 470 Writer->addRelocation(&Target.getSymA()->getSymbol(), Fragment->getParent(), 471 MRE); 472 } 473 474 void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer, 475 const MCAssembler &Asm, 476 const MCAsmLayout &Layout, 477 const MCFragment *Fragment, 478 const MCFixup &Fixup, 479 MCValue Target, 480 uint64_t &FixedValue) { 481 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 482 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 483 484 // If this is a 32-bit TLVP reloc it's handled a bit differently. 485 if (Target.getSymA() && 486 Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP) { 487 recordTLVPRelocation(Writer, Asm, Layout, Fragment, Fixup, Target, 488 FixedValue); 489 return; 490 } 491 492 // If this is a difference or a defined symbol plus an offset, then we need a 493 // scattered relocation entry. Differences always require scattered 494 // relocations. 495 if (Target.getSymB()) { 496 recordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, 497 Target, Log2Size, FixedValue); 498 return; 499 } 500 501 // Get the symbol data, if any. 502 const MCSymbol *A = nullptr; 503 if (Target.getSymA()) 504 A = &Target.getSymA()->getSymbol(); 505 506 // If this is an internal relocation with an offset, it also needs a scattered 507 // relocation entry. 508 uint32_t Offset = Target.getConstant(); 509 if (IsPCRel) 510 Offset += 1 << Log2Size; 511 // Try to record the scattered relocation if needed. Fall back to non 512 // scattered if necessary (see comments in recordScatteredRelocation() 513 // for details). 514 if (Offset && A && !Writer->doesSymbolRequireExternRelocation(*A) && 515 recordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, Target, 516 Log2Size, FixedValue)) 517 return; 518 519 // See <reloc.h>. 520 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 521 unsigned Index = 0; 522 unsigned Type = 0; 523 const MCSymbol *RelSymbol = nullptr; 524 525 if (Target.isAbsolute()) { // constant 526 // SymbolNum of 0 indicates the absolute section. 527 // 528 // FIXME: Currently, these are never generated (see code below). I cannot 529 // find a case where they are actually emitted. 530 Type = MachO::GENERIC_RELOC_VANILLA; 531 } else { 532 // Resolve constant variables. 533 if (A->isVariable()) { 534 int64_t Res; 535 if (A->getVariableValue()->evaluateAsAbsolute( 536 Res, Layout, Writer->getSectionAddressMap())) { 537 FixedValue = Res; 538 return; 539 } 540 } 541 542 // Check whether we need an external or internal relocation. 543 if (Writer->doesSymbolRequireExternRelocation(*A)) { 544 RelSymbol = A; 545 // For external relocations, make sure to offset the fixup value to 546 // compensate for the addend of the symbol address, if it was 547 // undefined. This occurs with weak definitions, for example. 548 if (!A->isUndefined()) 549 FixedValue -= Layout.getSymbolOffset(*A); 550 } else { 551 // The index is the section ordinal (1-based). 552 const MCSection &Sec = A->getSection(); 553 Index = Sec.getOrdinal() + 1; 554 FixedValue += Writer->getSectionAddress(&Sec); 555 } 556 if (IsPCRel) 557 FixedValue -= Writer->getSectionAddress(Fragment->getParent()); 558 559 Type = MachO::GENERIC_RELOC_VANILLA; 560 } 561 562 // struct relocation_info (8 bytes) 563 MachO::any_relocation_info MRE; 564 MRE.r_word0 = FixupOffset; 565 MRE.r_word1 = 566 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28); 567 Writer->addRelocation(RelSymbol, Fragment->getParent(), MRE); 568 } 569 570 MCObjectWriter *llvm::createX86MachObjectWriter(raw_pwrite_stream &OS, 571 bool Is64Bit, uint32_t CPUType, 572 uint32_t CPUSubtype) { 573 return createMachObjectWriter(new X86MachObjectWriter(Is64Bit, 574 CPUType, 575 CPUSubtype), 576 OS, /*IsLittleEndian=*/true); 577 } 578