X86MachObjectWriter.cpp revision ebc573ed5b7d4757d58b3bfdec53fcf9b4cb8c01
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/MCAsmLayout.h" 14#include "llvm/MC/MCAssembler.h" 15#include "llvm/MC/MCContext.h" 16#include "llvm/MC/MCMachObjectWriter.h" 17#include "llvm/MC/MCSectionMachO.h" 18#include "llvm/MC/MCValue.h" 19#include "llvm/Object/MachOFormat.h" 20#include "llvm/Support/ErrorHandling.h" 21#include "llvm/Support/Format.h" 22 23using namespace llvm; 24using namespace llvm::object; 25 26namespace { 27class 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, 52 const MCAssembler &Asm, 53 const MCAsmLayout &Layout, 54 const MCFragment *Fragment, 55 const MCFixup &Fixup, 56 MCValue Target, 57 uint64_t &FixedValue); 58public: 59 X86MachObjectWriter(bool Is64Bit, uint32_t CPUType, 60 uint32_t CPUSubtype) 61 : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype, 62 /*UseAggressiveSymbolFolding=*/Is64Bit) {} 63 64 void RecordRelocation(MachObjectWriter *Writer, 65 const MCAssembler &Asm, const MCAsmLayout &Layout, 66 const MCFragment *Fragment, const MCFixup &Fixup, 67 MCValue Target, uint64_t &FixedValue) { 68 if (Writer->is64Bit()) 69 RecordX86_64Relocation(Writer, Asm, Layout, Fragment, Fixup, Target, 70 FixedValue); 71 else 72 RecordX86Relocation(Writer, Asm, Layout, Fragment, Fixup, Target, 73 FixedValue); 74 } 75}; 76} 77 78static bool isFixupKindRIPRel(unsigned Kind) { 79 return Kind == X86::reloc_riprel_4byte || 80 Kind == X86::reloc_riprel_4byte_movq_load; 81} 82 83static unsigned getFixupKindLog2Size(unsigned Kind) { 84 switch (Kind) { 85 default: 86 llvm_unreachable("invalid fixup kind!"); 87 case FK_PCRel_1: 88 case FK_Data_1: return 0; 89 case FK_PCRel_2: 90 case FK_Data_2: return 1; 91 case FK_PCRel_4: 92 // FIXME: Remove these!!! 93 case X86::reloc_riprel_4byte: 94 case X86::reloc_riprel_4byte_movq_load: 95 case X86::reloc_signed_4byte: 96 case FK_Data_4: return 2; 97 case FK_Data_8: return 3; 98 } 99} 100 101void X86MachObjectWriter::RecordX86_64Relocation(MachObjectWriter *Writer, 102 const MCAssembler &Asm, 103 const MCAsmLayout &Layout, 104 const MCFragment *Fragment, 105 const MCFixup &Fixup, 106 MCValue Target, 107 uint64_t &FixedValue) { 108 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 109 unsigned IsRIPRel = isFixupKindRIPRel(Fixup.getKind()); 110 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 111 112 // See <reloc.h>. 113 uint32_t FixupOffset = 114 Layout.getFragmentOffset(Fragment) + Fixup.getOffset(); 115 uint32_t FixupAddress = 116 Writer->getFragmentAddress(Fragment, Layout) + Fixup.getOffset(); 117 int64_t Value = 0; 118 unsigned Index = 0; 119 unsigned IsExtern = 0; 120 unsigned Type = 0; 121 122 Value = Target.getConstant(); 123 124 if (IsPCRel) { 125 // Compensate for the relocation offset, Darwin x86_64 relocations only have 126 // the addend and appear to have attempted to define it to be the actual 127 // expression addend without the PCrel bias. However, instructions with data 128 // following the relocation are not accommodated for (see comment below 129 // regarding SIGNED{1,2,4}), so it isn't exactly that either. 130 Value += 1LL << Log2Size; 131 } 132 133 if (Target.isAbsolute()) { // constant 134 // SymbolNum of 0 indicates the absolute section. 135 Type = macho::RIT_X86_64_Unsigned; 136 Index = 0; 137 138 // FIXME: I believe this is broken, I don't think the linker can understand 139 // it. I think it would require a local relocation, but I'm not sure if that 140 // would work either. The official way to get an absolute PCrel relocation 141 // is to use an absolute symbol (which we don't support yet). 142 if (IsPCRel) { 143 IsExtern = 1; 144 Type = macho::RIT_X86_64_Branch; 145 } 146 } else if (Target.getSymB()) { // A - B + constant 147 const MCSymbol *A = &Target.getSymA()->getSymbol(); 148 MCSymbolData &A_SD = Asm.getSymbolData(*A); 149 const MCSymbolData *A_Base = Asm.getAtom(&A_SD); 150 151 const MCSymbol *B = &Target.getSymB()->getSymbol(); 152 MCSymbolData &B_SD = Asm.getSymbolData(*B); 153 const MCSymbolData *B_Base = Asm.getAtom(&B_SD); 154 155 // Neither symbol can be modified. 156 if (Target.getSymA()->getKind() != MCSymbolRefExpr::VK_None || 157 Target.getSymB()->getKind() != MCSymbolRefExpr::VK_None) 158 report_fatal_error("unsupported relocation of modified symbol"); 159 160 // We don't support PCrel relocations of differences. Darwin 'as' doesn't 161 // implement most of these correctly. 162 if (IsPCRel) 163 report_fatal_error("unsupported pc-relative relocation of difference"); 164 165 // The support for the situation where one or both of the symbols would 166 // require a local relocation is handled just like if the symbols were 167 // external. This is certainly used in the case of debug sections where the 168 // section has only temporary symbols and thus the symbols don't have base 169 // symbols. This is encoded using the section ordinal and non-extern 170 // relocation entries. 171 172 // Darwin 'as' doesn't emit correct relocations for this (it ends up with a 173 // single SIGNED relocation); reject it for now. Except the case where both 174 // symbols don't have a base, equal but both NULL. 175 if (A_Base == B_Base && A_Base) 176 report_fatal_error("unsupported relocation with identical base"); 177 178 // A subtraction expression where both symbols are undefined is a 179 // non-relocatable expression. 180 if (A->isUndefined() && B->isUndefined()) 181 report_fatal_error("unsupported relocation with subtraction expression"); 182 183 Value += Writer->getSymbolAddress(&A_SD, Layout) - 184 (A_Base == NULL ? 0 : Writer->getSymbolAddress(A_Base, Layout)); 185 Value -= Writer->getSymbolAddress(&B_SD, Layout) - 186 (B_Base == NULL ? 0 : Writer->getSymbolAddress(B_Base, Layout)); 187 188 if (A_Base) { 189 Index = A_Base->getIndex(); 190 IsExtern = 1; 191 } 192 else { 193 Index = A_SD.getFragment()->getParent()->getOrdinal() + 1; 194 IsExtern = 0; 195 } 196 Type = macho::RIT_X86_64_Unsigned; 197 198 macho::RelocationEntry MRE; 199 MRE.Word0 = FixupOffset; 200 MRE.Word1 = ((Index << 0) | 201 (IsPCRel << 24) | 202 (Log2Size << 25) | 203 (IsExtern << 27) | 204 (Type << 28)); 205 Writer->addRelocation(Fragment->getParent(), MRE); 206 207 if (B_Base) { 208 Index = B_Base->getIndex(); 209 IsExtern = 1; 210 } 211 else { 212 Index = B_SD.getFragment()->getParent()->getOrdinal() + 1; 213 IsExtern = 0; 214 } 215 Type = macho::RIT_X86_64_Subtractor; 216 } else { 217 const MCSymbol *Symbol = &Target.getSymA()->getSymbol(); 218 MCSymbolData &SD = Asm.getSymbolData(*Symbol); 219 const MCSymbolData *Base = Asm.getAtom(&SD); 220 221 // Relocations inside debug sections always use local relocations when 222 // possible. This seems to be done because the debugger doesn't fully 223 // understand x86_64 relocation entries, and expects to find values that 224 // have already been fixed up. 225 if (Symbol->isInSection()) { 226 const MCSectionMachO &Section = static_cast<const MCSectionMachO&>( 227 Fragment->getParent()->getSection()); 228 if (Section.hasAttribute(MCSectionMachO::S_ATTR_DEBUG)) 229 Base = 0; 230 } 231 232 // x86_64 almost always uses external relocations, except when there is no 233 // symbol to use as a base address (a local symbol with no preceding 234 // non-local symbol). 235 if (Base) { 236 Index = Base->getIndex(); 237 IsExtern = 1; 238 239 // Add the local offset, if needed. 240 if (Base != &SD) 241 Value += Layout.getSymbolOffset(&SD) - Layout.getSymbolOffset(Base); 242 } else if (Symbol->isInSection() && !Symbol->isVariable()) { 243 // The index is the section ordinal (1-based). 244 Index = SD.getFragment()->getParent()->getOrdinal() + 1; 245 IsExtern = 0; 246 Value += Writer->getSymbolAddress(&SD, Layout); 247 248 if (IsPCRel) 249 Value -= FixupAddress + (1 << Log2Size); 250 } else if (Symbol->isVariable()) { 251 const MCExpr *Value = Symbol->getVariableValue(); 252 int64_t Res; 253 bool isAbs = Value->EvaluateAsAbsolute(Res, Layout, 254 Writer->getSectionAddressMap()); 255 if (isAbs) { 256 FixedValue = Res; 257 return; 258 } else { 259 report_fatal_error("unsupported relocation of variable '" + 260 Symbol->getName() + "'"); 261 } 262 } else { 263 report_fatal_error("unsupported relocation of undefined symbol '" + 264 Symbol->getName() + "'"); 265 } 266 267 MCSymbolRefExpr::VariantKind Modifier = Target.getSymA()->getKind(); 268 if (IsPCRel) { 269 if (IsRIPRel) { 270 if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 271 // x86_64 distinguishes movq foo@GOTPCREL so that the linker can 272 // rewrite the movq to an leaq at link time if the symbol ends up in 273 // the same linkage unit. 274 if (unsigned(Fixup.getKind()) == X86::reloc_riprel_4byte_movq_load) 275 Type = macho::RIT_X86_64_GOTLoad; 276 else 277 Type = macho::RIT_X86_64_GOT; 278 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 279 Type = macho::RIT_X86_64_TLV; 280 } else if (Modifier != MCSymbolRefExpr::VK_None) { 281 report_fatal_error("unsupported symbol modifier in relocation"); 282 } else { 283 Type = macho::RIT_X86_64_Signed; 284 285 // The Darwin x86_64 relocation format has a problem where it cannot 286 // encode an address (L<foo> + <constant>) which is outside the atom 287 // containing L<foo>. Generally, this shouldn't occur but it does 288 // happen when we have a RIPrel instruction with data following the 289 // relocation entry (e.g., movb $012, L0(%rip)). Even with the PCrel 290 // adjustment Darwin x86_64 uses, the offset is still negative and the 291 // linker has no way to recognize this. 292 // 293 // To work around this, Darwin uses several special relocation types 294 // to indicate the offsets. However, the specification or 295 // implementation of these seems to also be incomplete; they should 296 // adjust the addend as well based on the actual encoded instruction 297 // (the additional bias), but instead appear to just look at the final 298 // offset. 299 switch (-(Target.getConstant() + (1LL << Log2Size))) { 300 case 1: Type = macho::RIT_X86_64_Signed1; break; 301 case 2: Type = macho::RIT_X86_64_Signed2; break; 302 case 4: Type = macho::RIT_X86_64_Signed4; break; 303 } 304 } 305 } else { 306 if (Modifier != MCSymbolRefExpr::VK_None) 307 report_fatal_error("unsupported symbol modifier in branch " 308 "relocation"); 309 310 Type = macho::RIT_X86_64_Branch; 311 } 312 } else { 313 if (Modifier == MCSymbolRefExpr::VK_GOT) { 314 Type = macho::RIT_X86_64_GOT; 315 } else if (Modifier == MCSymbolRefExpr::VK_GOTPCREL) { 316 // GOTPCREL is allowed as a modifier on non-PCrel instructions, in which 317 // case all we do is set the PCrel bit in the relocation entry; this is 318 // used with exception handling, for example. The source is required to 319 // include any necessary offset directly. 320 Type = macho::RIT_X86_64_GOT; 321 IsPCRel = 1; 322 } else if (Modifier == MCSymbolRefExpr::VK_TLVP) { 323 report_fatal_error("TLVP symbol modifier should have been rip-rel"); 324 } else if (Modifier != MCSymbolRefExpr::VK_None) 325 report_fatal_error("unsupported symbol modifier in relocation"); 326 else 327 Type = macho::RIT_X86_64_Unsigned; 328 } 329 } 330 331 // x86_64 always writes custom values into the fixups. 332 FixedValue = Value; 333 334 // struct relocation_info (8 bytes) 335 macho::RelocationEntry MRE; 336 MRE.Word0 = FixupOffset; 337 MRE.Word1 = ((Index << 0) | 338 (IsPCRel << 24) | 339 (Log2Size << 25) | 340 (IsExtern << 27) | 341 (Type << 28)); 342 Writer->addRelocation(Fragment->getParent(), MRE); 343} 344 345bool X86MachObjectWriter::RecordScatteredRelocation(MachObjectWriter *Writer, 346 const MCAssembler &Asm, 347 const MCAsmLayout &Layout, 348 const MCFragment *Fragment, 349 const MCFixup &Fixup, 350 MCValue Target, 351 unsigned Log2Size, 352 uint64_t &FixedValue) { 353 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 354 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 355 unsigned Type = macho::RIT_Vanilla; 356 357 // See <reloc.h>. 358 const MCSymbol *A = &Target.getSymA()->getSymbol(); 359 MCSymbolData *A_SD = &Asm.getSymbolData(*A); 360 361 if (!A_SD->getFragment()) 362 report_fatal_error("symbol '" + A->getName() + 363 "' can not be undefined in a subtraction expression"); 364 365 uint32_t Value = Writer->getSymbolAddress(A_SD, Layout); 366 uint64_t SecAddr = Writer->getSectionAddress(A_SD->getFragment()->getParent()); 367 FixedValue += SecAddr; 368 uint32_t Value2 = 0; 369 370 if (const MCSymbolRefExpr *B = Target.getSymB()) { 371 MCSymbolData *B_SD = &Asm.getSymbolData(B->getSymbol()); 372 373 if (!B_SD->getFragment()) 374 report_fatal_error("symbol '" + B->getSymbol().getName() + 375 "' can not be undefined in a subtraction expression"); 376 377 // Select the appropriate difference relocation type. 378 // 379 // Note that there is no longer any semantic difference between these two 380 // relocation types from the linkers point of view, this is done solely for 381 // pedantic compatibility with 'as'. 382 Type = A_SD->isExternal() ? (unsigned)macho::RIT_Difference : 383 (unsigned)macho::RIT_Generic_LocalDifference; 384 Value2 = Writer->getSymbolAddress(B_SD, Layout); 385 FixedValue -= Writer->getSectionAddress(B_SD->getFragment()->getParent()); 386 } 387 388 // Relocations are written out in reverse order, so the PAIR comes first. 389 if (Type == macho::RIT_Difference || 390 Type == macho::RIT_Generic_LocalDifference) { 391 // If the offset is too large to fit in a scattered relocation, 392 // we're hosed. It's an unfortunate limitation of the MachO format. 393 if (FixupOffset > 0xffffff) { 394 char Buffer[32]; 395 format("0x%x", FixupOffset).print(Buffer, sizeof(Buffer)); 396 Asm.getContext().FatalError(Fixup.getLoc(), 397 Twine("Section too large, can't encode " 398 "r_address (") + Buffer + 399 ") into 24 bits of scattered " 400 "relocation entry."); 401 llvm_unreachable("fatal error returned?!"); 402 } 403 404 macho::RelocationEntry MRE; 405 MRE.Word0 = ((0 << 0) | 406 (macho::RIT_Pair << 24) | 407 (Log2Size << 28) | 408 (IsPCRel << 30) | 409 macho::RF_Scattered); 410 MRE.Word1 = Value2; 411 Writer->addRelocation(Fragment->getParent(), MRE); 412 } else { 413 // If the offset is more than 24-bits, it won't fit in a scattered 414 // relocation offset field, so we fall back to using a non-scattered 415 // relocation. This is a bit risky, as if the offset reaches out of 416 // the block and the linker is doing scattered loading on this 417 // symbol, things can go badly. 418 // 419 // Required for 'as' compatibility. 420 if (FixupOffset > 0xffffff) 421 return false; 422 } 423 424 macho::RelocationEntry MRE; 425 MRE.Word0 = ((FixupOffset << 0) | 426 (Type << 24) | 427 (Log2Size << 28) | 428 (IsPCRel << 30) | 429 macho::RF_Scattered); 430 MRE.Word1 = Value; 431 Writer->addRelocation(Fragment->getParent(), MRE); 432 return true; 433} 434 435void X86MachObjectWriter::RecordTLVPRelocation(MachObjectWriter *Writer, 436 const MCAssembler &Asm, 437 const MCAsmLayout &Layout, 438 const MCFragment *Fragment, 439 const MCFixup &Fixup, 440 MCValue Target, 441 uint64_t &FixedValue) { 442 assert(Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP && 443 !is64Bit() && 444 "Should only be called with a 32-bit TLVP relocation!"); 445 446 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 447 uint32_t Value = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 448 unsigned IsPCRel = 0; 449 450 // Get the symbol data. 451 MCSymbolData *SD_A = &Asm.getSymbolData(Target.getSymA()->getSymbol()); 452 unsigned Index = SD_A->getIndex(); 453 454 // We're only going to have a second symbol in pic mode and it'll be a 455 // subtraction from the picbase. For 32-bit pic the addend is the difference 456 // between the picbase and the next address. For 32-bit static the addend is 457 // zero. 458 if (Target.getSymB()) { 459 // If this is a subtraction then we're pcrel. 460 uint32_t FixupAddress = 461 Writer->getFragmentAddress(Fragment, Layout) + Fixup.getOffset(); 462 MCSymbolData *SD_B = &Asm.getSymbolData(Target.getSymB()->getSymbol()); 463 IsPCRel = 1; 464 FixedValue = (FixupAddress - Writer->getSymbolAddress(SD_B, Layout) + 465 Target.getConstant()); 466 FixedValue += 1ULL << Log2Size; 467 } else { 468 FixedValue = 0; 469 } 470 471 // struct relocation_info (8 bytes) 472 macho::RelocationEntry MRE; 473 MRE.Word0 = Value; 474 MRE.Word1 = ((Index << 0) | 475 (IsPCRel << 24) | 476 (Log2Size << 25) | 477 (1 << 27) | // Extern 478 (macho::RIT_Generic_TLV << 28)); // Type 479 Writer->addRelocation(Fragment->getParent(), MRE); 480} 481 482void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer, 483 const MCAssembler &Asm, 484 const MCAsmLayout &Layout, 485 const MCFragment *Fragment, 486 const MCFixup &Fixup, 487 MCValue Target, 488 uint64_t &FixedValue) { 489 unsigned IsPCRel = Writer->isFixupKindPCRel(Asm, Fixup.getKind()); 490 unsigned Log2Size = getFixupKindLog2Size(Fixup.getKind()); 491 492 // If this is a 32-bit TLVP reloc it's handled a bit differently. 493 if (Target.getSymA() && 494 Target.getSymA()->getKind() == MCSymbolRefExpr::VK_TLVP) { 495 RecordTLVPRelocation(Writer, Asm, Layout, Fragment, Fixup, Target, 496 FixedValue); 497 return; 498 } 499 500 // If this is a difference or a defined symbol plus an offset, then we need a 501 // scattered relocation entry. Differences always require scattered 502 // relocations. 503 if (Target.getSymB()) { 504 RecordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, 505 Target, Log2Size, FixedValue); 506 return; 507 } 508 509 // Get the symbol data, if any. 510 MCSymbolData *SD = 0; 511 if (Target.getSymA()) 512 SD = &Asm.getSymbolData(Target.getSymA()->getSymbol()); 513 514 // If this is an internal relocation with an offset, it also needs a scattered 515 // relocation entry. 516 uint32_t Offset = Target.getConstant(); 517 if (IsPCRel) 518 Offset += 1 << Log2Size; 519 // Try to record the scattered relocation if needed. Fall back to non 520 // scattered if necessary (see comments in RecordScatteredRelocation() 521 // for details). 522 if (Offset && SD && !Writer->doesSymbolRequireExternRelocation(SD) && 523 RecordScatteredRelocation(Writer, Asm, Layout, Fragment, Fixup, 524 Target, Log2Size, FixedValue)) 525 return; 526 527 // See <reloc.h>. 528 uint32_t FixupOffset = Layout.getFragmentOffset(Fragment)+Fixup.getOffset(); 529 unsigned Index = 0; 530 unsigned IsExtern = 0; 531 unsigned Type = 0; 532 533 if (Target.isAbsolute()) { // constant 534 // SymbolNum of 0 indicates the absolute section. 535 // 536 // FIXME: Currently, these are never generated (see code below). I cannot 537 // find a case where they are actually emitted. 538 Type = macho::RIT_Vanilla; 539 } else { 540 // Resolve constant variables. 541 if (SD->getSymbol().isVariable()) { 542 int64_t Res; 543 if (SD->getSymbol().getVariableValue()->EvaluateAsAbsolute( 544 Res, Layout, Writer->getSectionAddressMap())) { 545 FixedValue = Res; 546 return; 547 } 548 } 549 550 // Check whether we need an external or internal relocation. 551 if (Writer->doesSymbolRequireExternRelocation(SD)) { 552 IsExtern = 1; 553 Index = SD->getIndex(); 554 // For external relocations, make sure to offset the fixup value to 555 // compensate for the addend of the symbol address, if it was 556 // undefined. This occurs with weak definitions, for example. 557 if (!SD->Symbol->isUndefined()) 558 FixedValue -= Layout.getSymbolOffset(SD); 559 } else { 560 // The index is the section ordinal (1-based). 561 const MCSectionData &SymSD = Asm.getSectionData( 562 SD->getSymbol().getSection()); 563 Index = SymSD.getOrdinal() + 1; 564 FixedValue += Writer->getSectionAddress(&SymSD); 565 } 566 if (IsPCRel) 567 FixedValue -= Writer->getSectionAddress(Fragment->getParent()); 568 569 Type = macho::RIT_Vanilla; 570 } 571 572 // struct relocation_info (8 bytes) 573 macho::RelocationEntry MRE; 574 MRE.Word0 = FixupOffset; 575 MRE.Word1 = ((Index << 0) | 576 (IsPCRel << 24) | 577 (Log2Size << 25) | 578 (IsExtern << 27) | 579 (Type << 28)); 580 Writer->addRelocation(Fragment->getParent(), MRE); 581} 582 583MCObjectWriter *llvm::createX86MachObjectWriter(raw_ostream &OS, 584 bool Is64Bit, 585 uint32_t CPUType, 586 uint32_t CPUSubtype) { 587 return createMachObjectWriter(new X86MachObjectWriter(Is64Bit, 588 CPUType, 589 CPUSubtype), 590 OS, /*IsLittleEndian=*/true); 591} 592