1//===-- X86MachObjectWriter.cpp - X86 Mach-O Writer -----------------------===//
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#include "MCTargetDesc/X86FixupKinds.h"
10#include "MCTargetDesc/X86MCAsmInfo.h"
11#include "MCTargetDesc/X86MCTargetDesc.h"
12#include "llvm/ADT/Twine.h"
13#include "llvm/BinaryFormat/MachO.h"
14#include "llvm/MC/MCAsmInfo.h"
15#include "llvm/MC/MCAsmInfoDarwin.h"
16#include "llvm/MC/MCAssembler.h"
17#include "llvm/MC/MCContext.h"
18#include "llvm/MC/MCMachObjectWriter.h"
19#include "llvm/MC/MCSectionMachO.h"
20#include "llvm/MC/MCValue.h"
21#include "llvm/Support/ErrorHandling.h"
22#include "llvm/Support/Format.h"
23
24using namespace llvm;
25
26namespace {
27class X86MachObjectWriter : public MCMachObjectTargetWriter {
28 bool recordScatteredRelocation(MachObjectWriter *Writer,
29 const MCAssembler &Asm,
30 const MCFragment *Fragment,
31 const MCFixup &Fixup,
32 MCValue Target,
33 unsigned Log2Size,
34 uint64_t &FixedValue);
35 void recordTLVPRelocation(MachObjectWriter *Writer,
36 const MCAssembler &Asm,
37 const MCFragment *Fragment,
38 const MCFixup &Fixup,
39 MCValue Target,
40 uint64_t &FixedValue);
41
42 void RecordX86Relocation(MachObjectWriter *Writer,
43 const MCAssembler &Asm,
44 const MCFragment *Fragment,
45 const MCFixup &Fixup,
46 MCValue Target,
47 uint64_t &FixedValue);
48 void RecordX86_64Relocation(MachObjectWriter *Writer, MCAssembler &Asm,
49 const MCFragment *Fragment, const MCFixup &Fixup,
50 MCValue Target, uint64_t &FixedValue);
51
52public:
53 X86MachObjectWriter(bool Is64Bit, uint32_t CPUType, uint32_t CPUSubtype)
54 : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {}
55
56 void recordRelocation(MachObjectWriter *Writer, MCAssembler &Asm,
57 const MCFragment *Fragment, const MCFixup &Fixup,
58 MCValue Target, uint64_t &FixedValue) override {
59 if (Writer->is64Bit())
60 RecordX86_64Relocation(Writer, Asm, Fragment, Fixup, Target, FixedValue);
61 else
62 RecordX86Relocation(Writer, Asm, Fragment, Fixup, Target, FixedValue);
63 }
64};
65} // namespace
66
67static bool isFixupKindRIPRel(unsigned Kind) {
68 return Kind == X86::reloc_riprel_4byte ||
69 Kind == X86::reloc_riprel_4byte_movq_load ||
70 Kind == X86::reloc_riprel_4byte_movq_load_rex2 ||
71 Kind == X86::reloc_riprel_4byte_relax ||
72 Kind == X86::reloc_riprel_4byte_relax_rex ||
73 Kind == X86::reloc_riprel_4byte_relax_rex2 ||
74 Kind == X86::reloc_riprel_4byte_relax_evex;
75}
76
77static unsigned getFixupKindLog2Size(unsigned Kind) {
78 switch (Kind) {
79 default:
80 llvm_unreachable("invalid fixup kind!");
81 case FK_PCRel_1:
82 case FK_Data_1: return 0;
83 case FK_PCRel_2:
84 case FK_Data_2: return 1;
85 case FK_PCRel_4:
86 // FIXME: Remove these!!!
87 case X86::reloc_riprel_4byte:
88 case X86::reloc_riprel_4byte_relax:
89 case X86::reloc_riprel_4byte_relax_rex:
90 case X86::reloc_riprel_4byte_relax_rex2:
91 case X86::reloc_riprel_4byte_movq_load:
92 case X86::reloc_riprel_4byte_movq_load_rex2:
93 case X86::reloc_signed_4byte:
94 case X86::reloc_signed_4byte_relax:
95 case X86::reloc_branch_4byte_pcrel:
96 case X86::reloc_riprel_4byte_relax_evex:
97 case FK_Data_4: return 2;
98 case FK_Data_8: return 3;
99 }
100}
101
102void X86MachObjectWriter::RecordX86_64Relocation(
103 MachObjectWriter *Writer, MCAssembler &Asm, const MCFragment *Fragment,
104 const MCFixup &Fixup, MCValue Target, uint64_t &FixedValue) {
105 unsigned IsPCRel = Fixup.isPCRel();
106 unsigned IsRIPRel = isFixupKindRIPRel(Kind: Fixup.getKind());
107 unsigned Log2Size = getFixupKindLog2Size(Kind: Fixup.getKind());
108
109 // See <reloc.h>.
110 uint32_t FixupOffset = Asm.getFragmentOffset(F: *Fragment) + Fixup.getOffset();
111 uint32_t FixupAddress =
112 Writer->getFragmentAddress(Asm, Fragment) + Fixup.getOffset();
113 int64_t Value = 0;
114 unsigned Index = 0;
115 unsigned IsExtern = 0;
116 unsigned Type = 0;
117 const MCSymbol *RelSymbol = nullptr;
118
119 Value = Target.getConstant();
120
121 if (IsPCRel) {
122 // Compensate for the relocation offset, Darwin x86_64 relocations only have
123 // the addend and appear to have attempted to define it to be the actual
124 // expression addend without the PCrel bias. However, instructions with data
125 // following the relocation are not accommodated for (see comment below
126 // regarding SIGNED{1,2,4}), so it isn't exactly that either.
127 Value += 1LL << Log2Size;
128 }
129
130 if (Target.isAbsolute()) { // constant
131 // SymbolNum of 0 indicates the absolute section.
132 Type = MachO::X86_64_RELOC_UNSIGNED;
133
134 // FIXME: I believe this is broken, I don't think the linker can understand
135 // it. I think it would require a local relocation, but I'm not sure if that
136 // would work either. The official way to get an absolute PCrel relocation
137 // is to use an absolute symbol (which we don't support yet).
138 if (IsPCRel) {
139 IsExtern = 1;
140 Type = MachO::X86_64_RELOC_BRANCH;
141 }
142 } else if (Target.getSubSym()) { // A - B + constant
143 const MCSymbol *A = Target.getAddSym();
144 if (A->isTemporary())
145 A = &Writer->findAliasedSymbol(Sym: *A);
146 const MCSymbol *A_Base = Writer->getAtom(S: *A);
147
148 const MCSymbol *B = Target.getSubSym();
149 if (B->isTemporary())
150 B = &Writer->findAliasedSymbol(Sym: *B);
151 const MCSymbol *B_Base = Writer->getAtom(S: *B);
152
153 // Neither symbol can be modified.
154 if (Target.getSpecifier()) {
155 reportError(L: Fixup.getLoc(), Msg: "unsupported relocation of modified symbol");
156 return;
157 }
158
159 // We don't support PCrel relocations of differences. Darwin 'as' doesn't
160 // implement most of these correctly.
161 if (IsPCRel) {
162 reportError(L: Fixup.getLoc(),
163 Msg: "unsupported pc-relative relocation of difference");
164 return;
165 }
166
167 // The support for the situation where one or both of the symbols would
168 // require a local relocation is handled just like if the symbols were
169 // external. This is certainly used in the case of debug sections where the
170 // section has only temporary symbols and thus the symbols don't have base
171 // symbols. This is encoded using the section ordinal and non-extern
172 // relocation entries.
173
174 // Darwin 'as' doesn't emit correct relocations for this (it ends up with a
175 // single SIGNED relocation); reject it for now. Except the case where both
176 // symbols don't have a base, equal but both NULL.
177 if (A_Base == B_Base && A_Base) {
178 reportError(L: Fixup.getLoc(), Msg: "unsupported relocation with identical base");
179 return;
180 }
181
182 // A subtraction expression where either symbol is undefined is a
183 // non-relocatable expression.
184 if (A->isUndefined() || B->isUndefined()) {
185 StringRef Name = A->isUndefined() ? A->getName() : B->getName();
186 reportError(
187 L: Fixup.getLoc(),
188 Msg: "unsupported relocation with subtraction expression, symbol '" +
189 Name + "' can not be undefined in a subtraction expression");
190 return;
191 }
192
193 Value += Writer->getSymbolAddress(S: *A) -
194 (!A_Base ? 0 : Writer->getSymbolAddress(S: *A_Base));
195 Value -= Writer->getSymbolAddress(S: *B) -
196 (!B_Base ? 0 : Writer->getSymbolAddress(S: *B_Base));
197
198 if (!A_Base)
199 Index = A->getFragment()->getParent()->getOrdinal() + 1;
200 Type = MachO::X86_64_RELOC_UNSIGNED;
201
202 MachO::any_relocation_info MRE;
203 MRE.r_word0 = FixupOffset;
204 MRE.r_word1 =
205 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28);
206 Writer->addRelocation(RelSymbol: A_Base, Sec: Fragment->getParent(), MRE);
207
208 if (B_Base)
209 RelSymbol = B_Base;
210 else
211 Index = B->getFragment()->getParent()->getOrdinal() + 1;
212 Type = MachO::X86_64_RELOC_SUBTRACTOR;
213 } else {
214 const MCSymbol *Symbol = Target.getAddSym();
215 if (Symbol->isTemporary() && Value) {
216 const MCSection &Sec = Symbol->getSection();
217 if (!MCAsmInfoDarwin::isSectionAtomizableBySymbols(Section: Sec))
218 Symbol->setUsedInReloc();
219 }
220 RelSymbol = Writer->getAtom(S: *Symbol);
221
222 // Relocations inside debug sections always use local relocations when
223 // possible. This seems to be done because the debugger doesn't fully
224 // understand x86_64 relocation entries, and expects to find values that
225 // have already been fixed up.
226 if (Symbol->isInSection()) {
227 const MCSectionMachO &Section =
228 static_cast<const MCSectionMachO &>(*Fragment->getParent());
229 if (Section.hasAttribute(Value: MachO::S_ATTR_DEBUG))
230 RelSymbol = nullptr;
231 }
232
233 // x86_64 almost always uses external relocations, except when there is no
234 // symbol to use as a base address (a local symbol with no preceding
235 // non-local symbol).
236 if (RelSymbol) {
237 // Add the local offset, if needed.
238 if (RelSymbol != Symbol)
239 Value += Asm.getSymbolOffset(S: *Symbol) - Asm.getSymbolOffset(S: *RelSymbol);
240 } else if (Symbol->isInSection() && !Symbol->isVariable()) {
241 // The index is the section ordinal (1-based).
242 Index = Symbol->getFragment()->getParent()->getOrdinal() + 1;
243 Value += Writer->getSymbolAddress(S: *Symbol);
244
245 if (IsPCRel)
246 Value -= FixupAddress + (1 << Log2Size);
247 } else if (Symbol->isVariable()) {
248 FixedValue = Writer->getSymbolAddress(S: *Symbol);
249 return;
250 } else {
251 reportError(L: Fixup.getLoc(),
252 Msg: "unsupported relocation of undefined symbol '" +
253 Symbol->getName() + "'");
254 return;
255 }
256
257 auto Specifier = Target.getSpecifier();
258 if (IsPCRel) {
259 if (IsRIPRel) {
260 if (Specifier == X86::S_GOTPCREL) {
261 // x86_64 distinguishes movq foo@GOTPCREL so that the linker can
262 // rewrite the movq to an leaq at link time if the symbol ends up in
263 // the same linkage unit.
264 if (Fixup.getTargetKind() == X86::reloc_riprel_4byte_movq_load)
265 Type = MachO::X86_64_RELOC_GOT_LOAD;
266 else
267 Type = MachO::X86_64_RELOC_GOT;
268 } else if (Specifier == X86::S_TLVP) {
269 Type = MachO::X86_64_RELOC_TLV;
270 } else if (Specifier) {
271 reportError(L: Fixup.getLoc(),
272 Msg: "unsupported symbol modifier in relocation");
273 return;
274 } else {
275 Type = MachO::X86_64_RELOC_SIGNED;
276
277 // The Darwin x86_64 relocation format has a problem where it cannot
278 // encode an address (L<foo> + <constant>) which is outside the atom
279 // containing L<foo>. Generally, this shouldn't occur but it does
280 // happen when we have a RIPrel instruction with data following the
281 // relocation entry (e.g., movb $012, L0(%rip)). Even with the PCrel
282 // adjustment Darwin x86_64 uses, the offset is still negative and the
283 // linker has no way to recognize this.
284 //
285 // To work around this, Darwin uses several special relocation types
286 // to indicate the offsets. However, the specification or
287 // implementation of these seems to also be incomplete; they should
288 // adjust the addend as well based on the actual encoded instruction
289 // (the additional bias), but instead appear to just look at the final
290 // offset.
291 switch (-(Target.getConstant() + (1LL << Log2Size))) {
292 case 1: Type = MachO::X86_64_RELOC_SIGNED_1; break;
293 case 2: Type = MachO::X86_64_RELOC_SIGNED_2; break;
294 case 4: Type = MachO::X86_64_RELOC_SIGNED_4; break;
295 }
296 }
297 } else {
298 if (Specifier) {
299 reportError(L: Fixup.getLoc(),
300 Msg: "unsupported symbol modifier in branch relocation");
301 return;
302 }
303
304 Type = MachO::X86_64_RELOC_BRANCH;
305 }
306 } else {
307 if (Specifier == X86::S_GOT) {
308 Type = MachO::X86_64_RELOC_GOT;
309 } else if (Specifier == X86::S_GOTPCREL) {
310 // GOTPCREL is allowed as a modifier on non-PCrel instructions, in which
311 // case all we do is set the PCrel bit in the relocation entry; this is
312 // used with exception handling, for example. The source is required to
313 // include any necessary offset directly.
314 Type = MachO::X86_64_RELOC_GOT;
315 IsPCRel = 1;
316 } else if (Specifier == X86::S_TLVP) {
317 reportError(L: Fixup.getLoc(),
318 Msg: "TLVP symbol modifier should have been rip-rel");
319 return;
320 } else if (Specifier) {
321 reportError(L: Fixup.getLoc(),
322 Msg: "unsupported symbol modifier in relocation");
323 return;
324 } else {
325 Type = MachO::X86_64_RELOC_UNSIGNED;
326 if (Fixup.getTargetKind() == X86::reloc_signed_4byte) {
327 reportError(
328 L: Fixup.getLoc(),
329 Msg: "32-bit absolute addressing is not supported in 64-bit mode");
330 return;
331 }
332 }
333 }
334 }
335
336 // x86_64 always writes custom values into the fixups.
337 FixedValue = Value;
338
339 // struct relocation_info (8 bytes)
340 MachO::any_relocation_info MRE;
341 MRE.r_word0 = FixupOffset;
342 MRE.r_word1 = (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) |
343 (IsExtern << 27) | (Type << 28);
344 Writer->addRelocation(RelSymbol, Sec: Fragment->getParent(), MRE);
345}
346
347bool X86MachObjectWriter::recordScatteredRelocation(MachObjectWriter *Writer,
348 const MCAssembler &Asm,
349 const MCFragment *Fragment,
350 const MCFixup &Fixup,
351 MCValue Target,
352 unsigned Log2Size,
353 uint64_t &FixedValue) {
354 uint64_t OriginalFixedValue = FixedValue;
355 uint32_t FixupOffset = Asm.getFragmentOffset(F: *Fragment) + Fixup.getOffset();
356 unsigned IsPCRel = Fixup.isPCRel();
357 unsigned Type = MachO::GENERIC_RELOC_VANILLA;
358
359 // See <reloc.h>.
360 const MCSymbol *A = Target.getAddSym();
361
362 if (!A->getFragment()) {
363 reportError(L: Fixup.getLoc(),
364 Msg: "symbol '" + A->getName() +
365 "' can not be undefined in a subtraction expression");
366 return false;
367 }
368
369 uint32_t Value = Writer->getSymbolAddress(S: *A);
370 uint64_t SecAddr = Writer->getSectionAddress(Sec: A->getFragment()->getParent());
371 FixedValue += SecAddr;
372 uint32_t Value2 = 0;
373
374 if (const MCSymbol *SB = Target.getSubSym()) {
375 if (!SB->getFragment()) {
376 reportError(L: Fixup.getLoc(),
377 Msg: "symbol '" + SB->getName() +
378 "' can not be undefined in a subtraction expression");
379 return false;
380 }
381
382 // Select the appropriate difference relocation type.
383 //
384 // Note that there is no longer any semantic difference between these two
385 // relocation types from the linkers point of view, this is done solely for
386 // pedantic compatibility with 'as'.
387 Type = A->isExternal() ? (unsigned)MachO::GENERIC_RELOC_SECTDIFF
388 : (unsigned)MachO::GENERIC_RELOC_LOCAL_SECTDIFF;
389 Value2 = Writer->getSymbolAddress(S: *SB);
390 FixedValue -= Writer->getSectionAddress(Sec: SB->getFragment()->getParent());
391 }
392
393 // Relocations are written out in reverse order, so the PAIR comes first.
394 if (Type == MachO::GENERIC_RELOC_SECTDIFF ||
395 Type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF) {
396 // If the offset is too large to fit in a scattered relocation,
397 // we're hosed. It's an unfortunate limitation of the MachO format.
398 if (FixupOffset > 0xffffff) {
399 char Buffer[32];
400 format(Fmt: "0x%x", Vals: FixupOffset).print(Buffer, BufferSize: sizeof(Buffer));
401 reportError(L: Fixup.getLoc(), Msg: Twine("Section too large, can't encode "
402 "r_address (") +
403 Buffer +
404 ") into 24 bits of scattered "
405 "relocation entry.");
406 return false;
407 }
408
409 MachO::any_relocation_info MRE;
410 MRE.r_word0 = ((0 << 0) | // r_address
411 (MachO::GENERIC_RELOC_PAIR << 24) | // r_type
412 (Log2Size << 28) |
413 (IsPCRel << 30) |
414 MachO::R_SCATTERED);
415 MRE.r_word1 = Value2;
416 Writer->addRelocation(RelSymbol: nullptr, Sec: Fragment->getParent(), MRE);
417 } else {
418 // If the offset is more than 24-bits, it won't fit in a scattered
419 // relocation offset field, so we fall back to using a non-scattered
420 // relocation. This is a bit risky, as if the offset reaches out of
421 // the block and the linker is doing scattered loading on this
422 // symbol, things can go badly.
423 //
424 // Required for 'as' compatibility.
425 if (FixupOffset > 0xffffff) {
426 FixedValue = OriginalFixedValue;
427 return false;
428 }
429 }
430
431 MachO::any_relocation_info MRE;
432 MRE.r_word0 = ((FixupOffset << 0) |
433 (Type << 24) |
434 (Log2Size << 28) |
435 (IsPCRel << 30) |
436 MachO::R_SCATTERED);
437 MRE.r_word1 = Value;
438 Writer->addRelocation(RelSymbol: nullptr, Sec: Fragment->getParent(), MRE);
439 return true;
440}
441
442void X86MachObjectWriter::recordTLVPRelocation(MachObjectWriter *Writer,
443 const MCAssembler &Asm,
444 const MCFragment *Fragment,
445 const MCFixup &Fixup,
446 MCValue Target,
447 uint64_t &FixedValue) {
448 const MCSymbol *SymA = Target.getAddSym();
449 assert(Target.getSpecifier() == X86::S_TLVP && !is64Bit() &&
450 "Should only be called with a 32-bit TLVP relocation!");
451
452 unsigned Log2Size = getFixupKindLog2Size(Kind: Fixup.getKind());
453 uint32_t Value = Asm.getFragmentOffset(F: *Fragment) + Fixup.getOffset();
454 unsigned IsPCRel = 0;
455
456 // We're only going to have a second symbol in pic mode and it'll be a
457 // subtraction from the picbase. For 32-bit pic the addend is the difference
458 // between the picbase and the next address. For 32-bit static the addend is
459 // zero.
460 if (auto *SymB = Target.getSubSym()) {
461 // If this is a subtraction then we're pcrel.
462 uint32_t FixupAddress =
463 Writer->getFragmentAddress(Asm, Fragment) + Fixup.getOffset();
464 IsPCRel = 1;
465 FixedValue =
466 FixupAddress - Writer->getSymbolAddress(S: *SymB) + Target.getConstant();
467 FixedValue += 1ULL << Log2Size;
468 } else {
469 FixedValue = 0;
470 }
471
472 // struct relocation_info (8 bytes)
473 MachO::any_relocation_info MRE;
474 MRE.r_word0 = Value;
475 MRE.r_word1 =
476 (IsPCRel << 24) | (Log2Size << 25) | (MachO::GENERIC_RELOC_TLV << 28);
477 Writer->addRelocation(RelSymbol: SymA, Sec: Fragment->getParent(), MRE);
478}
479
480void X86MachObjectWriter::RecordX86Relocation(MachObjectWriter *Writer,
481 const MCAssembler &Asm,
482 const MCFragment *Fragment,
483 const MCFixup &Fixup,
484 MCValue Target,
485 uint64_t &FixedValue) {
486 unsigned IsPCRel = Fixup.isPCRel();
487 unsigned Log2Size = getFixupKindLog2Size(Kind: Fixup.getKind());
488 const MCSymbol *A = Target.getAddSym();
489
490 // If this is a 32-bit TLVP reloc it's handled a bit differently.
491 if (A && Target.getSpecifier() == X86::S_TLVP) {
492 recordTLVPRelocation(Writer, Asm, Fragment, Fixup, Target, FixedValue);
493 return;
494 }
495
496 // If this is a difference or a defined symbol plus an offset, then we need a
497 // scattered relocation entry. Differences always require scattered
498 // relocations.
499 if (Target.getSubSym()) {
500 recordScatteredRelocation(Writer, Asm, Fragment, Fixup, Target, Log2Size,
501 FixedValue);
502 return;
503 }
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
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(S: *A) &&
515 recordScatteredRelocation(Writer, Asm, Fragment, Fixup, Target, Log2Size,
516 FixedValue))
517 return;
518
519 // See <reloc.h>.
520 uint32_t FixupOffset = Asm.getFragmentOffset(F: *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 assert(A && "Unknown symbol data");
533
534 // Resolve constant variables.
535 if (A->isVariable()) {
536 MCValue Val;
537 bool Relocatable =
538 A->getVariableValue()->evaluateAsRelocatable(Res&: Val, Asm: &Asm);
539 int64_t Res = Val.getConstant();
540 bool isAbs = Val.isAbsolute();
541 if (Relocatable && Val.getAddSym() && Val.getSubSym()) {
542 Res += Writer->getSymbolAddress(S: *Val.getAddSym()) -
543 Writer->getSymbolAddress(S: *Val.getSubSym());
544 isAbs = true;
545 }
546 if (isAbs) {
547 FixedValue = Res;
548 return;
549 }
550 }
551
552 // Check whether we need an external or internal relocation.
553 if (Writer->doesSymbolRequireExternRelocation(S: *A)) {
554 RelSymbol = A;
555 // For external relocations, make sure to offset the fixup value to
556 // compensate for the addend of the symbol address, if it was
557 // undefined. This occurs with weak definitions, for example.
558 if (!A->isUndefined())
559 FixedValue -= Asm.getSymbolOffset(S: *A);
560 } else {
561 // The index is the section ordinal (1-based).
562 const MCSection &Sec = A->getSection();
563 Index = Sec.getOrdinal() + 1;
564 FixedValue += Writer->getSectionAddress(Sec: &Sec);
565 }
566 if (IsPCRel)
567 FixedValue -= Writer->getSectionAddress(Sec: Fragment->getParent());
568
569 Type = MachO::GENERIC_RELOC_VANILLA;
570 }
571
572 // struct relocation_info (8 bytes)
573 MachO::any_relocation_info MRE;
574 MRE.r_word0 = FixupOffset;
575 MRE.r_word1 =
576 (Index << 0) | (IsPCRel << 24) | (Log2Size << 25) | (Type << 28);
577 Writer->addRelocation(RelSymbol, Sec: Fragment->getParent(), MRE);
578}
579
580std::unique_ptr<MCObjectTargetWriter>
581llvm::createX86MachObjectWriter(bool Is64Bit, uint32_t CPUType,
582 uint32_t CPUSubtype) {
583 return std::make_unique<X86MachObjectWriter>(args&: Is64Bit, args&: CPUType, args&: CPUSubtype);
584}
585