1//===- ELFObjcopy.cpp -----------------------------------------------------===//
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 "llvm/ObjCopy/ELF/ELFObjcopy.h"
10#include "ELFObject.h"
11#include "llvm/ADT/BitmaskEnum.h"
12#include "llvm/ADT/DenseSet.h"
13#include "llvm/ADT/SmallVector.h"
14#include "llvm/ADT/StringRef.h"
15#include "llvm/ADT/Twine.h"
16#include "llvm/BinaryFormat/ELF.h"
17#include "llvm/MC/MCTargetOptions.h"
18#include "llvm/ObjCopy/CommonConfig.h"
19#include "llvm/ObjCopy/ELF/ELFConfig.h"
20#include "llvm/Object/Binary.h"
21#include "llvm/Object/ELFObjectFile.h"
22#include "llvm/Object/ELFTypes.h"
23#include "llvm/Object/Error.h"
24#include "llvm/Option/Option.h"
25#include "llvm/Support/Casting.h"
26#include "llvm/Support/Compression.h"
27#include "llvm/Support/Errc.h"
28#include "llvm/Support/Error.h"
29#include "llvm/Support/ErrorHandling.h"
30#include "llvm/Support/Memory.h"
31#include "llvm/Support/raw_ostream.h"
32#include <algorithm>
33#include <cassert>
34#include <cstdlib>
35#include <functional>
36#include <memory>
37#include <string>
38#include <system_error>
39#include <utility>
40
41using namespace llvm;
42using namespace llvm::ELF;
43using namespace llvm::objcopy;
44using namespace llvm::objcopy::elf;
45using namespace llvm::object;
46
47using SectionPred = std::function<bool(const SectionBase &Sec)>;
48
49static bool isDebugSection(const SectionBase &Sec) {
50 return StringRef(Sec.Name).starts_with(Prefix: ".debug") || Sec.Name == ".gdb_index";
51}
52
53static bool isDWOSection(const SectionBase &Sec) {
54 return StringRef(Sec.Name).ends_with(Suffix: ".dwo");
55}
56
57static bool onlyKeepDWOPred(const Object &Obj, const SectionBase &Sec) {
58 // We can't remove the section header string table.
59 if (&Sec == Obj.SectionNames)
60 return false;
61 // Short of keeping the string table we want to keep everything that is a DWO
62 // section and remove everything else.
63 return !isDWOSection(Sec);
64}
65
66static Expected<uint64_t> getNewShfFlags(SectionFlag AllFlags,
67 uint16_t EMachine) {
68 uint64_t NewFlags = 0;
69 if (AllFlags & SectionFlag::SecAlloc)
70 NewFlags |= ELF::SHF_ALLOC;
71 if (!(AllFlags & SectionFlag::SecReadonly))
72 NewFlags |= ELF::SHF_WRITE;
73 if (AllFlags & SectionFlag::SecCode)
74 NewFlags |= ELF::SHF_EXECINSTR;
75 if (AllFlags & SectionFlag::SecMerge)
76 NewFlags |= ELF::SHF_MERGE;
77 if (AllFlags & SectionFlag::SecStrings)
78 NewFlags |= ELF::SHF_STRINGS;
79 if (AllFlags & SectionFlag::SecExclude)
80 NewFlags |= ELF::SHF_EXCLUDE;
81 if (AllFlags & SectionFlag::SecLarge) {
82 if (EMachine != EM_X86_64)
83 return createStringError(EC: errc::invalid_argument,
84 S: "section flag SHF_X86_64_LARGE can only be used "
85 "with x86_64 architecture");
86 NewFlags |= ELF::SHF_X86_64_LARGE;
87 }
88 return NewFlags;
89}
90
91static uint64_t getSectionFlagsPreserveMask(uint64_t OldFlags,
92 uint64_t NewFlags,
93 uint16_t EMachine) {
94 // Preserve some flags which should not be dropped when setting flags.
95 // Also, preserve anything OS/processor dependant.
96 const uint64_t PreserveMask =
97 (ELF::SHF_COMPRESSED | ELF::SHF_GROUP | ELF::SHF_LINK_ORDER |
98 ELF::SHF_MASKOS | ELF::SHF_MASKPROC | ELF::SHF_TLS |
99 ELF::SHF_INFO_LINK) &
100 ~ELF::SHF_EXCLUDE &
101 ~(EMachine == EM_X86_64 ? (uint64_t)ELF::SHF_X86_64_LARGE : 0UL);
102 return (OldFlags & PreserveMask) | (NewFlags & ~PreserveMask);
103}
104
105static void setSectionType(SectionBase &Sec, uint64_t Type) {
106 // If Sec's type is changed from SHT_NOBITS due to --set-section-flags,
107 // Offset may not be aligned. Align it to max(Align, 1).
108 if (Sec.Type == ELF::SHT_NOBITS && Type != ELF::SHT_NOBITS)
109 Sec.Offset = alignTo(Value: Sec.Offset, Align: std::max(a: Sec.Align, b: uint64_t(1)));
110 Sec.Type = Type;
111}
112
113static Error setSectionFlagsAndType(SectionBase &Sec, SectionFlag Flags,
114 uint16_t EMachine) {
115 Expected<uint64_t> NewFlags = getNewShfFlags(AllFlags: Flags, EMachine);
116 if (!NewFlags)
117 return NewFlags.takeError();
118 Sec.Flags = getSectionFlagsPreserveMask(OldFlags: Sec.Flags, NewFlags: *NewFlags, EMachine);
119
120 // In GNU objcopy, certain flags promote SHT_NOBITS to SHT_PROGBITS. This rule
121 // may promote more non-ALLOC sections than GNU objcopy, but it is fine as
122 // non-ALLOC SHT_NOBITS sections do not make much sense.
123 if (Sec.Type == SHT_NOBITS &&
124 (!(Sec.Flags & ELF::SHF_ALLOC) ||
125 Flags & (SectionFlag::SecContents | SectionFlag::SecLoad)))
126 setSectionType(Sec, Type: ELF::SHT_PROGBITS);
127
128 return Error::success();
129}
130
131static ElfType getOutputElfType(const Binary &Bin) {
132 // Infer output ELF type from the input ELF object
133 if (isa<ELFObjectFile<ELF32LE>>(Val: Bin))
134 return ELFT_ELF32LE;
135 if (isa<ELFObjectFile<ELF64LE>>(Val: Bin))
136 return ELFT_ELF64LE;
137 if (isa<ELFObjectFile<ELF32BE>>(Val: Bin))
138 return ELFT_ELF32BE;
139 if (isa<ELFObjectFile<ELF64BE>>(Val: Bin))
140 return ELFT_ELF64BE;
141 llvm_unreachable("Invalid ELFType");
142}
143
144static ElfType getOutputElfType(const MachineInfo &MI) {
145 // Infer output ELF type from the binary arch specified
146 if (MI.Is64Bit)
147 return MI.IsLittleEndian ? ELFT_ELF64LE : ELFT_ELF64BE;
148 else
149 return MI.IsLittleEndian ? ELFT_ELF32LE : ELFT_ELF32BE;
150}
151
152static std::unique_ptr<Writer> createELFWriter(const CommonConfig &Config,
153 Object &Obj, raw_ostream &Out,
154 ElfType OutputElfType) {
155 // Depending on the initial ELFT and OutputFormat we need a different Writer.
156 switch (OutputElfType) {
157 case ELFT_ELF32LE:
158 return std::make_unique<ELFWriter<ELF32LE>>(args&: Obj, args&: Out, args: !Config.StripSections,
159 args: Config.OnlyKeepDebug);
160 case ELFT_ELF64LE:
161 return std::make_unique<ELFWriter<ELF64LE>>(args&: Obj, args&: Out, args: !Config.StripSections,
162 args: Config.OnlyKeepDebug);
163 case ELFT_ELF32BE:
164 return std::make_unique<ELFWriter<ELF32BE>>(args&: Obj, args&: Out, args: !Config.StripSections,
165 args: Config.OnlyKeepDebug);
166 case ELFT_ELF64BE:
167 return std::make_unique<ELFWriter<ELF64BE>>(args&: Obj, args&: Out, args: !Config.StripSections,
168 args: Config.OnlyKeepDebug);
169 }
170 llvm_unreachable("Invalid output format");
171}
172
173static std::unique_ptr<Writer> createWriter(const CommonConfig &Config,
174 Object &Obj, raw_ostream &Out,
175 ElfType OutputElfType) {
176 switch (Config.OutputFormat) {
177 case FileFormat::Binary:
178 return std::make_unique<BinaryWriter>(args&: Obj, args&: Out, args: Config);
179 case FileFormat::IHex:
180 return std::make_unique<IHexWriter>(args&: Obj, args&: Out, args: Config.OutputFilename);
181 case FileFormat::SREC:
182 return std::make_unique<SRECWriter>(args&: Obj, args&: Out, args: Config.OutputFilename);
183 default:
184 return createELFWriter(Config, Obj, Out, OutputElfType);
185 }
186}
187
188static Error dumpSectionToFile(StringRef SecName, StringRef Filename,
189 StringRef InputFilename, Object &Obj) {
190 for (auto &Sec : Obj.sections()) {
191 if (Sec.Name == SecName) {
192 if (Sec.Type == SHT_NOBITS)
193 return createFileError(F: InputFilename, EC: object_error::parse_failed,
194 Fmt: "cannot dump section '%s': it has no contents",
195 Vals: SecName.str().c_str());
196 Expected<std::unique_ptr<FileOutputBuffer>> BufferOrErr =
197 FileOutputBuffer::create(FilePath: Filename, Size: Sec.OriginalData.size());
198 if (!BufferOrErr)
199 return createFileError(F: Filename, E: BufferOrErr.takeError());
200 std::unique_ptr<FileOutputBuffer> Buf = std::move(*BufferOrErr);
201 std::copy(first: Sec.OriginalData.begin(), last: Sec.OriginalData.end(),
202 result: Buf->getBufferStart());
203 if (Error E = Buf->commit())
204 return createFileError(F: Filename, E: std::move(E));
205 return Error::success();
206 }
207 }
208
209 return createFileError(F: InputFilename, EC: object_error::parse_failed,
210 Fmt: "section '%s' not found", Vals: SecName.str().c_str());
211}
212
213Error Object::compressOrDecompressSections(const CommonConfig &Config) {
214 // Build a list of sections we are going to replace.
215 // We can't call `addSection` while iterating over sections,
216 // because it would mutate the sections array.
217 SmallVector<std::pair<SectionBase *, std::function<SectionBase *()>>, 0>
218 ToReplace;
219 for (SectionBase &Sec : sections()) {
220 std::optional<DebugCompressionType> CType;
221 for (auto &[Matcher, T] : Config.compressSections)
222 if (Matcher.matches(S: Sec.Name))
223 CType = T;
224 // Handle --compress-debug-sections and --decompress-debug-sections, which
225 // apply to non-ALLOC debug sections.
226 if (!(Sec.Flags & SHF_ALLOC) && StringRef(Sec.Name).starts_with(Prefix: ".debug")) {
227 if (Config.CompressionType != DebugCompressionType::None)
228 CType = Config.CompressionType;
229 else if (Config.DecompressDebugSections)
230 CType = DebugCompressionType::None;
231 }
232 if (!CType)
233 continue;
234
235 if (Sec.ParentSegment)
236 return createStringError(
237 EC: errc::invalid_argument,
238 S: "section '" + Sec.Name +
239 "' within a segment cannot be (de)compressed");
240
241 if (auto *CS = dyn_cast<CompressedSection>(Val: &Sec)) {
242 if (*CType == DebugCompressionType::None)
243 ToReplace.emplace_back(
244 Args: &Sec, Args: [=] { return &addSection<DecompressedSection>(Args&: *CS); });
245 } else if (*CType != DebugCompressionType::None) {
246 ToReplace.emplace_back(Args: &Sec, Args: [=, S = &Sec] {
247 return &addSection<CompressedSection>(
248 Args: CompressedSection(*S, *CType, Is64Bits));
249 });
250 }
251 }
252
253 DenseMap<SectionBase *, SectionBase *> FromTo;
254 for (auto [S, Func] : ToReplace)
255 FromTo[S] = Func();
256 return replaceSections(FromTo);
257}
258
259static bool isAArch64MappingSymbol(const Symbol &Sym) {
260 if (Sym.Binding != STB_LOCAL || Sym.Type != STT_NOTYPE ||
261 Sym.getShndx() == SHN_UNDEF)
262 return false;
263 StringRef Name = Sym.Name;
264 if (!Name.consume_front(Prefix: "$x") && !Name.consume_front(Prefix: "$d"))
265 return false;
266 return Name.empty() || Name.starts_with(Prefix: ".");
267}
268
269static bool isArmMappingSymbol(const Symbol &Sym) {
270 if (Sym.Binding != STB_LOCAL || Sym.Type != STT_NOTYPE ||
271 Sym.getShndx() == SHN_UNDEF)
272 return false;
273 StringRef Name = Sym.Name;
274 if (!Name.consume_front(Prefix: "$a") && !Name.consume_front(Prefix: "$d") &&
275 !Name.consume_front(Prefix: "$t"))
276 return false;
277 return Name.empty() || Name.starts_with(Prefix: ".");
278}
279
280// Check if the symbol should be preserved because it is required by ABI.
281static bool isRequiredByABISymbol(const Object &Obj, const Symbol &Sym) {
282 switch (Obj.Machine) {
283 case EM_AARCH64:
284 // Mapping symbols should be preserved for a relocatable object file.
285 return Obj.isRelocatable() && isAArch64MappingSymbol(Sym);
286 case EM_ARM:
287 // Mapping symbols should be preserved for a relocatable object file.
288 return Obj.isRelocatable() && isArmMappingSymbol(Sym);
289 default:
290 return false;
291 }
292}
293
294static bool isUnneededSymbol(const Symbol &Sym) {
295 return !Sym.Referenced &&
296 (Sym.Binding == STB_LOCAL || Sym.getShndx() == SHN_UNDEF) &&
297 Sym.Type != STT_SECTION;
298}
299
300static Error updateAndRemoveSymbols(const CommonConfig &Config,
301 const ELFConfig &ELFConfig, Object &Obj) {
302 // TODO: update or remove symbols only if there is an option that affects
303 // them.
304 if (!Obj.SymbolTable)
305 return Error::success();
306
307 Obj.SymbolTable->updateSymbols(Callable: [&](Symbol &Sym) {
308 if (Config.SymbolsToSkip.matches(S: Sym.Name))
309 return;
310
311 // Common and undefined symbols don't make sense as local symbols, and can
312 // even cause crashes if we localize those, so skip them.
313 if (!Sym.isCommon() && Sym.getShndx() != SHN_UNDEF &&
314 ((ELFConfig.LocalizeHidden &&
315 (Sym.Visibility == STV_HIDDEN || Sym.Visibility == STV_INTERNAL)) ||
316 Config.SymbolsToLocalize.matches(S: Sym.Name)))
317 Sym.Binding = STB_LOCAL;
318
319 for (auto &[Matcher, Visibility] : ELFConfig.SymbolsToSetVisibility)
320 if (Matcher.matches(S: Sym.Name))
321 Sym.Visibility = Visibility;
322
323 // Note: these two globalize flags have very similar names but different
324 // meanings:
325 //
326 // --globalize-symbol: promote a symbol to global
327 // --keep-global-symbol: all symbols except for these should be made local
328 //
329 // If --globalize-symbol is specified for a given symbol, it will be
330 // global in the output file even if it is not included via
331 // --keep-global-symbol. Because of that, make sure to check
332 // --globalize-symbol second.
333 if (!Config.SymbolsToKeepGlobal.empty() &&
334 !Config.SymbolsToKeepGlobal.matches(S: Sym.Name) &&
335 Sym.getShndx() != SHN_UNDEF)
336 Sym.Binding = STB_LOCAL;
337
338 if (Config.SymbolsToGlobalize.matches(S: Sym.Name) &&
339 Sym.getShndx() != SHN_UNDEF)
340 Sym.Binding = STB_GLOBAL;
341
342 // SymbolsToWeaken applies to both STB_GLOBAL and STB_GNU_UNIQUE.
343 if (Config.SymbolsToWeaken.matches(S: Sym.Name) && Sym.Binding != STB_LOCAL)
344 Sym.Binding = STB_WEAK;
345
346 if (Config.Weaken && Sym.Binding != STB_LOCAL &&
347 Sym.getShndx() != SHN_UNDEF)
348 Sym.Binding = STB_WEAK;
349
350 const auto I = Config.SymbolsToRename.find(Key: Sym.Name);
351 if (I != Config.SymbolsToRename.end())
352 Sym.Name = std::string(I->getValue());
353
354 if (!Config.SymbolsPrefixRemove.empty() && Sym.Type != STT_SECTION)
355 if (StringRef(Sym.Name).starts_with(Prefix: Config.SymbolsPrefixRemove))
356 Sym.Name = Sym.Name.substr(pos: Config.SymbolsPrefixRemove.size());
357
358 if (!Config.SymbolsPrefix.empty() && Sym.Type != STT_SECTION)
359 Sym.Name = (Config.SymbolsPrefix + Sym.Name).str();
360 });
361
362 // The purpose of this loop is to mark symbols referenced by sections
363 // (like GroupSection or RelocationSection). This way, we know which
364 // symbols are still 'needed' and which are not.
365 if (Config.StripUnneeded || !Config.UnneededSymbolsToRemove.empty() ||
366 !Config.OnlySection.empty() || Config.DiscardMode != DiscardType::None) {
367 for (SectionBase &Sec : Obj.sections())
368 Sec.markSymbols();
369 }
370
371 auto RemoveSymbolsPred = [&](const Symbol &Sym) {
372 if (Config.SymbolsToKeep.matches(S: Sym.Name) ||
373 (ELFConfig.KeepFileSymbols && Sym.Type == STT_FILE))
374 return false;
375
376 if (Config.SymbolsToRemove.matches(S: Sym.Name))
377 return true;
378
379 if (Config.StripAll || Config.StripAllGNU)
380 return true;
381
382 if (isRequiredByABISymbol(Obj, Sym))
383 return false;
384
385 if (Config.StripDebug && Sym.Type == STT_FILE)
386 return true;
387
388 if ((Config.StripUnneeded ||
389 Config.UnneededSymbolsToRemove.matches(S: Sym.Name)) &&
390 (!Obj.isRelocatable() || isUnneededSymbol(Sym)))
391 return true;
392
393 if (!Sym.Referenced) {
394 if ((Config.DiscardMode == DiscardType::All ||
395 (Config.DiscardMode == DiscardType::Locals &&
396 StringRef(Sym.Name).starts_with(Prefix: ".L"))) &&
397 Sym.Binding == STB_LOCAL && Sym.getShndx() != SHN_UNDEF &&
398 Sym.Type != STT_FILE && Sym.Type != STT_SECTION)
399 return true;
400 // We want to remove undefined symbols if all references have been
401 // stripped.
402 if (!Config.OnlySection.empty() && Sym.getShndx() == SHN_UNDEF)
403 return true;
404 }
405
406 return false;
407 };
408
409 return Obj.removeSymbols(ToRemove: RemoveSymbolsPred);
410}
411
412static Error replaceAndRemoveSections(const CommonConfig &Config,
413 const ELFConfig &ELFConfig, Object &Obj) {
414 SectionPred RemovePred = [](const SectionBase &) { return false; };
415
416 // Removes:
417 if (!Config.ToRemove.empty()) {
418 RemovePred = [&Config](const SectionBase &Sec) {
419 return Config.ToRemove.matches(S: Sec.Name);
420 };
421 }
422
423 if (Config.StripDWO)
424 RemovePred = [RemovePred](const SectionBase &Sec) {
425 return isDWOSection(Sec) || RemovePred(Sec);
426 };
427
428 if (Config.ExtractDWO)
429 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
430 return onlyKeepDWOPred(Obj, Sec) || RemovePred(Sec);
431 };
432
433 if (Config.StripAllGNU)
434 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
435 if (RemovePred(Sec))
436 return true;
437 if ((Sec.Flags & SHF_ALLOC) != 0)
438 return false;
439 if (&Sec == Obj.SectionNames)
440 return false;
441 switch (Sec.Type) {
442 case SHT_SYMTAB:
443 case SHT_REL:
444 case SHT_RELA:
445 case SHT_STRTAB:
446 return true;
447 }
448 return isDebugSection(Sec);
449 };
450
451 if (Config.StripSections) {
452 RemovePred = [RemovePred](const SectionBase &Sec) {
453 return RemovePred(Sec) || Sec.ParentSegment == nullptr;
454 };
455 }
456
457 if (Config.StripDebug || Config.StripUnneeded) {
458 RemovePred = [RemovePred](const SectionBase &Sec) {
459 return RemovePred(Sec) || isDebugSection(Sec);
460 };
461 }
462
463 if (Config.StripNonAlloc)
464 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
465 if (RemovePred(Sec))
466 return true;
467 if (&Sec == Obj.SectionNames)
468 return false;
469 return (Sec.Flags & SHF_ALLOC) == 0 && Sec.ParentSegment == nullptr;
470 };
471
472 if (Config.StripAll)
473 RemovePred = [RemovePred, &Obj](const SectionBase &Sec) {
474 if (RemovePred(Sec))
475 return true;
476 if (&Sec == Obj.SectionNames)
477 return false;
478 if (StringRef(Sec.Name).starts_with(Prefix: ".gnu.warning"))
479 return false;
480 if (StringRef(Sec.Name).starts_with(Prefix: ".gnu_debuglink"))
481 return false;
482 // We keep the .ARM.attribute section to maintain compatibility
483 // with Debian derived distributions. This is a bug in their
484 // patchset as documented here:
485 // https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=943798
486 if (Sec.Type == SHT_ARM_ATTRIBUTES)
487 return false;
488 if (Sec.ParentSegment != nullptr)
489 return false;
490 return (Sec.Flags & SHF_ALLOC) == 0;
491 };
492
493 if (Config.ExtractPartition || Config.ExtractMainPartition) {
494 RemovePred = [RemovePred](const SectionBase &Sec) {
495 if (RemovePred(Sec))
496 return true;
497 if (Sec.Type == SHT_LLVM_PART_EHDR || Sec.Type == SHT_LLVM_PART_PHDR)
498 return true;
499 return (Sec.Flags & SHF_ALLOC) != 0 && !Sec.ParentSegment;
500 };
501 }
502
503 // Explicit copies:
504 if (!Config.OnlySection.empty()) {
505 RemovePred = [&Config, RemovePred, &Obj](const SectionBase &Sec) {
506 // Explicitly keep these sections regardless of previous removes.
507 if (Config.OnlySection.matches(S: Sec.Name))
508 return false;
509
510 // Allow all implicit removes.
511 if (RemovePred(Sec))
512 return true;
513
514 // Keep special sections.
515 if (Obj.SectionNames == &Sec)
516 return false;
517 if (Obj.SymbolTable == &Sec ||
518 (Obj.SymbolTable && Obj.SymbolTable->getStrTab() == &Sec))
519 return false;
520
521 // Remove everything else.
522 return true;
523 };
524 }
525
526 if (!Config.KeepSection.empty()) {
527 RemovePred = [&Config, RemovePred](const SectionBase &Sec) {
528 // Explicitly keep these sections regardless of previous removes.
529 if (Config.KeepSection.matches(S: Sec.Name))
530 return false;
531 // Otherwise defer to RemovePred.
532 return RemovePred(Sec);
533 };
534 }
535
536 // This has to be the last predicate assignment.
537 // If the option --keep-symbol has been specified
538 // and at least one of those symbols is present
539 // (equivalently, the updated symbol table is not empty)
540 // the symbol table and the string table should not be removed.
541 if ((!Config.SymbolsToKeep.empty() || ELFConfig.KeepFileSymbols) &&
542 Obj.SymbolTable && !Obj.SymbolTable->empty()) {
543 RemovePred = [&Obj, RemovePred](const SectionBase &Sec) {
544 if (&Sec == Obj.SymbolTable || &Sec == Obj.SymbolTable->getStrTab())
545 return false;
546 return RemovePred(Sec);
547 };
548 }
549
550 if (Error E = Obj.removeSections(AllowBrokenLinks: ELFConfig.AllowBrokenLinks, ToRemove: RemovePred))
551 return E;
552
553 if (Error E = Obj.compressOrDecompressSections(Config))
554 return E;
555
556 return Error::success();
557}
558
559// Add symbol to the Object symbol table with the specified properties.
560static void addSymbol(Object &Obj, const NewSymbolInfo &SymInfo,
561 uint8_t DefaultVisibility) {
562 SectionBase *Sec = Obj.findSection(Name: SymInfo.SectionName);
563 uint64_t Value = Sec ? Sec->Addr + SymInfo.Value : SymInfo.Value;
564
565 uint8_t Bind = ELF::STB_GLOBAL;
566 uint8_t Type = ELF::STT_NOTYPE;
567 uint8_t Visibility = DefaultVisibility;
568
569 for (SymbolFlag FlagValue : SymInfo.Flags)
570 switch (FlagValue) {
571 case SymbolFlag::Global:
572 Bind = ELF::STB_GLOBAL;
573 break;
574 case SymbolFlag::Local:
575 Bind = ELF::STB_LOCAL;
576 break;
577 case SymbolFlag::Weak:
578 Bind = ELF::STB_WEAK;
579 break;
580 case SymbolFlag::Default:
581 Visibility = ELF::STV_DEFAULT;
582 break;
583 case SymbolFlag::Hidden:
584 Visibility = ELF::STV_HIDDEN;
585 break;
586 case SymbolFlag::Protected:
587 Visibility = ELF::STV_PROTECTED;
588 break;
589 case SymbolFlag::File:
590 Type = ELF::STT_FILE;
591 break;
592 case SymbolFlag::Section:
593 Type = ELF::STT_SECTION;
594 break;
595 case SymbolFlag::Object:
596 Type = ELF::STT_OBJECT;
597 break;
598 case SymbolFlag::Function:
599 Type = ELF::STT_FUNC;
600 break;
601 case SymbolFlag::IndirectFunction:
602 Type = ELF::STT_GNU_IFUNC;
603 break;
604 default: /* Other flag values are ignored for ELF. */
605 break;
606 };
607
608 Obj.SymbolTable->addSymbol(
609 Name: SymInfo.SymbolName, Bind, Type, DefinedIn: Sec, Value, Visibility,
610 Shndx: Sec ? (uint16_t)SYMBOL_SIMPLE_INDEX : (uint16_t)SHN_ABS, SymbolSize: 0);
611}
612
613namespace {
614struct RemoveNoteDetail {
615 struct DeletedRange {
616 uint64_t OldFrom;
617 uint64_t OldTo;
618 };
619
620 template <class ELFT>
621 static std::vector<DeletedRange>
622 findNotesToRemove(ArrayRef<uint8_t> Data, size_t Align,
623 ArrayRef<RemoveNoteInfo> NotesToRemove);
624 static std::vector<uint8_t> updateData(ArrayRef<uint8_t> OldData,
625 ArrayRef<DeletedRange> ToRemove);
626};
627} // namespace
628
629template <class ELFT>
630std::vector<RemoveNoteDetail::DeletedRange>
631RemoveNoteDetail::findNotesToRemove(ArrayRef<uint8_t> Data, size_t Align,
632 ArrayRef<RemoveNoteInfo> NotesToRemove) {
633 using Elf_Nhdr = typename ELFT::Nhdr;
634 using Elf_Note = typename ELFT::Note;
635 std::vector<DeletedRange> ToRemove;
636 uint64_t CurPos = 0;
637 while (CurPos + sizeof(Elf_Nhdr) <= Data.size()) {
638 auto Nhdr = reinterpret_cast<const Elf_Nhdr *>(Data.data() + CurPos);
639 size_t FullSize = Nhdr->getSize(Align);
640 if (CurPos + FullSize > Data.size())
641 break;
642 Elf_Note Note(*Nhdr);
643 bool ShouldRemove =
644 llvm::any_of(NotesToRemove, [&Note](const RemoveNoteInfo &NoteInfo) {
645 return NoteInfo.TypeId == Note.getType() &&
646 (NoteInfo.Name.empty() || NoteInfo.Name == Note.getName());
647 });
648 if (ShouldRemove)
649 ToRemove.push_back(x: {.OldFrom: CurPos, .OldTo: CurPos + FullSize});
650 CurPos += FullSize;
651 }
652 return ToRemove;
653}
654
655std::vector<uint8_t>
656RemoveNoteDetail::updateData(ArrayRef<uint8_t> OldData,
657 ArrayRef<DeletedRange> ToRemove) {
658 std::vector<uint8_t> NewData;
659 NewData.reserve(n: OldData.size());
660 uint64_t CurPos = 0;
661 for (const DeletedRange &RemRange : ToRemove) {
662 if (CurPos < RemRange.OldFrom) {
663 auto Slice = OldData.slice(N: CurPos, M: RemRange.OldFrom - CurPos);
664 llvm::append_range(C&: NewData, R&: Slice);
665 }
666 CurPos = RemRange.OldTo;
667 }
668 if (CurPos < OldData.size()) {
669 auto Slice = OldData.slice(N: CurPos);
670 llvm::append_range(C&: NewData, R&: Slice);
671 }
672 return NewData;
673}
674
675static Error removeNotes(Object &Obj, endianness Endianness,
676 ArrayRef<RemoveNoteInfo> NotesToRemove,
677 function_ref<Error(Error)> ErrorCallback) {
678 // TODO: Support note segments.
679 if (ErrorCallback) {
680 for (Segment &Seg : Obj.segments()) {
681 if (Seg.Type == PT_NOTE) {
682 if (Error E = ErrorCallback(createStringError(
683 EC: errc::not_supported, S: "note segments are not supported")))
684 return E;
685 break;
686 }
687 }
688 }
689 for (auto &Sec : Obj.sections()) {
690 if (Sec.Type != SHT_NOTE || !Sec.hasContents())
691 continue;
692 // TODO: Support note sections in segments.
693 if (Sec.ParentSegment) {
694 if (ErrorCallback)
695 if (Error E = ErrorCallback(createStringError(
696 EC: errc::not_supported,
697 S: "cannot remove note(s) from " + Sec.Name +
698 ": sections in segments are not supported")))
699 return E;
700 continue;
701 }
702 ArrayRef<uint8_t> OldData = Sec.getContents();
703 size_t Align = std::max<size_t>(a: 4, b: Sec.Align);
704 // Note: notes for both 32-bit and 64-bit ELF files use 4-byte words in the
705 // header, so the parsers are the same.
706 auto ToRemove = (Endianness == endianness::little)
707 ? RemoveNoteDetail::findNotesToRemove<ELF64LE>(
708 Data: OldData, Align, NotesToRemove)
709 : RemoveNoteDetail::findNotesToRemove<ELF64BE>(
710 Data: OldData, Align, NotesToRemove);
711 if (!ToRemove.empty()) {
712 if (Error E = Obj.updateSectionData(
713 S&: Sec, Data: RemoveNoteDetail::updateData(OldData, ToRemove)))
714 return E;
715 }
716 }
717 return Error::success();
718}
719
720static Error
721handleUserSection(const NewSectionInfo &NewSection,
722 function_ref<Error(StringRef, ArrayRef<uint8_t>)> F) {
723 ArrayRef<uint8_t> Data(reinterpret_cast<const uint8_t *>(
724 NewSection.SectionData->getBufferStart()),
725 NewSection.SectionData->getBufferSize());
726 return F(NewSection.SectionName, Data);
727}
728
729static Error verifyNoteSection(StringRef Name, endianness Endianness,
730 ArrayRef<uint8_t> Data) {
731 // An ELF note has the following structure:
732 // Name Size: 4 bytes (integer)
733 // Desc Size: 4 bytes (integer)
734 // Type : 4 bytes
735 // Name : variable size, padded to a 4 byte boundary
736 // Desc : variable size, padded to a 4 byte boundary
737
738 if (Data.empty())
739 return Error::success();
740
741 if (Data.size() < 12) {
742 std::string msg;
743 raw_string_ostream(msg)
744 << Name << " data must be either empty or at least 12 bytes long";
745 return createStringError(EC: errc::invalid_argument, S: msg);
746 }
747 if (Data.size() % 4 != 0) {
748 std::string msg;
749 raw_string_ostream(msg)
750 << Name << " data size must be a multiple of 4 bytes";
751 return createStringError(EC: errc::invalid_argument, S: msg);
752 }
753 ArrayRef<uint8_t> NameSize = Data.slice(N: 0, M: 4);
754 ArrayRef<uint8_t> DescSize = Data.slice(N: 4, M: 4);
755
756 uint32_t NameSizeValue = support::endian::read32(P: NameSize.data(), E: Endianness);
757 uint32_t DescSizeValue = support::endian::read32(P: DescSize.data(), E: Endianness);
758
759 uint64_t ExpectedDataSize =
760 /*NameSize=*/4 + /*DescSize=*/4 + /*Type=*/4 +
761 /*Name=*/alignTo(Value: NameSizeValue, Align: 4) +
762 /*Desc=*/alignTo(Value: DescSizeValue, Align: 4);
763 uint64_t ActualDataSize = Data.size();
764 if (ActualDataSize != ExpectedDataSize) {
765 std::string msg;
766 raw_string_ostream(msg)
767 << Name
768 << " data size is incompatible with the content of "
769 "the name and description size fields:"
770 << " expecting " << ExpectedDataSize << ", found " << ActualDataSize;
771 return createStringError(EC: errc::invalid_argument, S: msg);
772 }
773
774 return Error::success();
775}
776
777// This function handles the high level operations of GNU objcopy including
778// handling command line options. It's important to outline certain properties
779// we expect to hold of the command line operations. Any operation that "keeps"
780// should keep regardless of a remove. Additionally any removal should respect
781// any previous removals. Lastly whether or not something is removed shouldn't
782// depend a) on the order the options occur in or b) on some opaque priority
783// system. The only priority is that keeps/copies overrule removes.
784static Error handleArgs(const CommonConfig &Config, const ELFConfig &ELFConfig,
785 ElfType OutputElfType, Object &Obj) {
786 if (Config.OutputArch) {
787 Obj.Machine = Config.OutputArch->EMachine;
788 Obj.OSABI = Config.OutputArch->OSABI;
789 }
790
791 if (!Config.SplitDWO.empty() && Config.ExtractDWO) {
792 return Obj.removeSections(
793 AllowBrokenLinks: ELFConfig.AllowBrokenLinks,
794 ToRemove: [&Obj](const SectionBase &Sec) { return onlyKeepDWOPred(Obj, Sec); });
795 }
796
797 // Dump sections before add/remove for compatibility with GNU objcopy.
798 for (StringRef Flag : Config.DumpSection) {
799 StringRef SectionName;
800 StringRef FileName;
801 std::tie(args&: SectionName, args&: FileName) = Flag.split(Separator: '=');
802 if (Error E =
803 dumpSectionToFile(SecName: SectionName, Filename: FileName, InputFilename: Config.InputFilename, Obj))
804 return E;
805 }
806
807 // It is important to remove the sections first. For example, we want to
808 // remove the relocation sections before removing the symbols. That allows
809 // us to avoid reporting the inappropriate errors about removing symbols
810 // named in relocations.
811 if (Error E = replaceAndRemoveSections(Config, ELFConfig, Obj))
812 return createFileError(F: Config.InputFilename, E: std::move(E));
813
814 if (Error E = updateAndRemoveSymbols(Config, ELFConfig, Obj))
815 return createFileError(F: Config.InputFilename, E: std::move(E));
816
817 if (!Config.SetSectionAlignment.empty()) {
818 for (SectionBase &Sec : Obj.sections()) {
819 auto I = Config.SetSectionAlignment.find(Key: Sec.Name);
820 if (I != Config.SetSectionAlignment.end())
821 Sec.Align = I->second;
822 }
823 }
824
825 if (Config.ChangeSectionLMAValAll != 0) {
826 for (Segment &Seg : Obj.segments()) {
827 if (Seg.MemSize > 0) {
828 if (Config.ChangeSectionLMAValAll > 0 &&
829 Seg.PAddr > std::numeric_limits<uint64_t>::max() -
830 Config.ChangeSectionLMAValAll) {
831 return createFileError(
832 F: Config.InputFilename, EC: errc::invalid_argument,
833 S: "address 0x" + Twine::utohexstr(Val: Seg.PAddr) +
834 " cannot be increased by 0x" +
835 Twine::utohexstr(Val: Config.ChangeSectionLMAValAll) +
836 ". The result would overflow");
837 } else if (Config.ChangeSectionLMAValAll < 0 &&
838 Seg.PAddr < std::numeric_limits<uint64_t>::min() -
839 Config.ChangeSectionLMAValAll) {
840 return createFileError(
841 F: Config.InputFilename, EC: errc::invalid_argument,
842 S: "address 0x" + Twine::utohexstr(Val: Seg.PAddr) +
843 " cannot be decreased by 0x" +
844 Twine::utohexstr(Val: std::abs(i: Config.ChangeSectionLMAValAll)) +
845 ". The result would underflow");
846 }
847 Seg.PAddr += Config.ChangeSectionLMAValAll;
848 }
849 }
850 }
851
852 if (!Config.ChangeSectionAddress.empty()) {
853 if (Obj.Type != ELF::ET_REL)
854 return createFileError(
855 F: Config.InputFilename, EC: object_error::invalid_file_type,
856 Fmt: "cannot change section address in a non-relocatable file");
857 StringMap<AddressUpdate> SectionsToUpdateAddress;
858 for (const SectionPatternAddressUpdate &PatternUpdate :
859 reverse(C: Config.ChangeSectionAddress)) {
860 for (SectionBase &Sec : Obj.sections()) {
861 if (PatternUpdate.SectionPattern.matches(S: Sec.Name) &&
862 SectionsToUpdateAddress.try_emplace(Key: Sec.Name, Args: PatternUpdate.Update)
863 .second) {
864 if (PatternUpdate.Update.Kind == AdjustKind::Subtract &&
865 Sec.Addr < PatternUpdate.Update.Value) {
866 return createFileError(
867 F: Config.InputFilename, EC: errc::invalid_argument,
868 S: "address 0x" + Twine::utohexstr(Val: Sec.Addr) +
869 " cannot be decreased by 0x" +
870 Twine::utohexstr(Val: PatternUpdate.Update.Value) +
871 ". The result would underflow");
872 }
873 if (PatternUpdate.Update.Kind == AdjustKind::Add &&
874 Sec.Addr > std::numeric_limits<uint64_t>::max() -
875 PatternUpdate.Update.Value) {
876 return createFileError(
877 F: Config.InputFilename, EC: errc::invalid_argument,
878 S: "address 0x" + Twine::utohexstr(Val: Sec.Addr) +
879 " cannot be increased by 0x" +
880 Twine::utohexstr(Val: PatternUpdate.Update.Value) +
881 ". The result would overflow");
882 }
883
884 switch (PatternUpdate.Update.Kind) {
885 case (AdjustKind::Set):
886 Sec.Addr = PatternUpdate.Update.Value;
887 break;
888 case (AdjustKind::Subtract):
889 Sec.Addr -= PatternUpdate.Update.Value;
890 break;
891 case (AdjustKind::Add):
892 Sec.Addr += PatternUpdate.Update.Value;
893 break;
894 }
895 }
896 }
897 }
898 }
899
900 if (Config.OnlyKeepDebug)
901 for (auto &Sec : Obj.sections())
902 if (Sec.Flags & SHF_ALLOC && Sec.Type != SHT_NOTE)
903 Sec.Type = SHT_NOBITS;
904
905 endianness E = OutputElfType == ELFT_ELF32LE || OutputElfType == ELFT_ELF64LE
906 ? endianness::little
907 : endianness::big;
908
909 if (!ELFConfig.NotesToRemove.empty()) {
910 if (Error Err =
911 removeNotes(Obj, Endianness: E, NotesToRemove: ELFConfig.NotesToRemove, ErrorCallback: Config.ErrorCallback))
912 return createFileError(F: Config.InputFilename, E: std::move(Err));
913 }
914
915 for (const NewSectionInfo &AddedSection : Config.AddSection) {
916 auto AddSection = [&](StringRef Name, ArrayRef<uint8_t> Data) -> Error {
917 OwnedDataSection &NewSection =
918 Obj.addSection<OwnedDataSection>(Args&: Name, Args&: Data);
919 if (Name.starts_with(Prefix: ".note") && Name != ".note.GNU-stack") {
920 NewSection.Type = SHT_NOTE;
921 if (ELFConfig.VerifyNoteSections)
922 return verifyNoteSection(Name, Endianness: E, Data);
923 }
924 return Error::success();
925 };
926 if (Error E = handleUserSection(NewSection: AddedSection, F: AddSection))
927 return createFileError(F: Config.InputFilename, E: std::move(E));
928 }
929
930 for (const NewSectionInfo &NewSection : Config.UpdateSection) {
931 auto UpdateSection = [&](StringRef Name, ArrayRef<uint8_t> Data) {
932 return Obj.updateSection(Name, Data);
933 };
934 if (Error E = handleUserSection(NewSection, F: UpdateSection))
935 return createFileError(F: Config.InputFilename, E: std::move(E));
936 }
937
938 if (!Config.AddGnuDebugLink.empty())
939 Obj.addSection<GnuDebugLinkSection>(Args: Config.AddGnuDebugLink,
940 Args: Config.GnuDebugLinkCRC32);
941
942 // If the symbol table was previously removed, we need to create a new one
943 // before adding new symbols.
944 if (!Obj.SymbolTable && !Config.SymbolsToAdd.empty())
945 if (Error E = Obj.addNewSymbolTable())
946 return createFileError(F: Config.InputFilename, E: std::move(E));
947
948 for (const NewSymbolInfo &SI : Config.SymbolsToAdd)
949 addSymbol(Obj, SymInfo: SI, DefaultVisibility: ELFConfig.NewSymbolVisibility);
950
951 // --set-section-{flags,type} work with sections added by --add-section.
952 if (!Config.SetSectionFlags.empty() || !Config.SetSectionType.empty()) {
953 for (auto &Sec : Obj.sections()) {
954 const auto Iter = Config.SetSectionFlags.find(Key: Sec.Name);
955 if (Iter != Config.SetSectionFlags.end()) {
956 const SectionFlagsUpdate &SFU = Iter->second;
957 if (Error E = setSectionFlagsAndType(Sec, Flags: SFU.NewFlags, EMachine: Obj.Machine))
958 return createFileError(F: Config.InputFilename, E: std::move(E));
959 }
960 auto It2 = Config.SetSectionType.find(Key: Sec.Name);
961 if (It2 != Config.SetSectionType.end())
962 setSectionType(Sec, Type: It2->second);
963 }
964 }
965
966 if (!Config.SectionsToRename.empty()) {
967 std::vector<RelocationSectionBase *> RelocSections;
968 DenseSet<SectionBase *> RenamedSections;
969 for (SectionBase &Sec : Obj.sections()) {
970 auto *RelocSec = dyn_cast<RelocationSectionBase>(Val: &Sec);
971 const auto Iter = Config.SectionsToRename.find(Key: Sec.Name);
972 if (Iter != Config.SectionsToRename.end()) {
973 const SectionRename &SR = Iter->second;
974 Sec.Name = std::string(SR.NewName);
975 if (SR.NewFlags) {
976 if (Error E = setSectionFlagsAndType(Sec, Flags: *SR.NewFlags, EMachine: Obj.Machine))
977 return createFileError(F: Config.InputFilename, E: std::move(E));
978 }
979 RenamedSections.insert(V: &Sec);
980 } else if (RelocSec && !(Sec.Flags & SHF_ALLOC))
981 // Postpone processing relocation sections which are not specified in
982 // their explicit '--rename-section' commands until after their target
983 // sections are renamed.
984 // Dynamic relocation sections (i.e. ones with SHF_ALLOC) should be
985 // renamed only explicitly. Otherwise, renaming, for example, '.got.plt'
986 // would affect '.rela.plt', which is not desirable.
987 RelocSections.push_back(x: RelocSec);
988 }
989
990 // Rename relocation sections according to their target sections.
991 for (RelocationSectionBase *RelocSec : RelocSections) {
992 auto Iter = RenamedSections.find(V: RelocSec->getSection());
993 if (Iter != RenamedSections.end())
994 RelocSec->Name = (RelocSec->getNamePrefix() + (*Iter)->Name).str();
995 }
996 }
997
998 // Add a prefix to allocated sections and their relocation sections. This
999 // should be done after renaming the section by Config.SectionToRename to
1000 // imitate the GNU objcopy behavior.
1001 if (!Config.AllocSectionsPrefix.empty()) {
1002 DenseSet<SectionBase *> PrefixedSections;
1003 for (SectionBase &Sec : Obj.sections()) {
1004 if (Sec.Flags & SHF_ALLOC) {
1005 Sec.Name = (Config.AllocSectionsPrefix + Sec.Name).str();
1006 PrefixedSections.insert(V: &Sec);
1007 } else if (auto *RelocSec = dyn_cast<RelocationSectionBase>(Val: &Sec)) {
1008 // Rename relocation sections associated to the allocated sections.
1009 // For example, if we rename .text to .prefix.text, we also rename
1010 // .rel.text to .rel.prefix.text.
1011 //
1012 // Dynamic relocation sections (SHT_REL[A] with SHF_ALLOC) are handled
1013 // above, e.g., .rela.plt is renamed to .prefix.rela.plt, not
1014 // .rela.prefix.plt since GNU objcopy does so.
1015 const SectionBase *TargetSec = RelocSec->getSection();
1016 if (TargetSec && (TargetSec->Flags & SHF_ALLOC)) {
1017 // If the relocation section comes *after* the target section, we
1018 // don't add Config.AllocSectionsPrefix because we've already added
1019 // the prefix to TargetSec->Name. Otherwise, if the relocation
1020 // section comes *before* the target section, we add the prefix.
1021 if (PrefixedSections.count(V: TargetSec))
1022 Sec.Name = (RelocSec->getNamePrefix() + TargetSec->Name).str();
1023 else
1024 Sec.Name = (RelocSec->getNamePrefix() + Config.AllocSectionsPrefix +
1025 TargetSec->Name)
1026 .str();
1027 }
1028 }
1029 }
1030 }
1031
1032 if (ELFConfig.EntryExpr)
1033 Obj.Entry = ELFConfig.EntryExpr(Obj.Entry);
1034 return Error::success();
1035}
1036
1037static Error writeOutput(const CommonConfig &Config, Object &Obj,
1038 raw_ostream &Out, ElfType OutputElfType) {
1039 std::unique_ptr<Writer> Writer =
1040 createWriter(Config, Obj, Out, OutputElfType);
1041 if (Error E = Writer->finalize())
1042 return E;
1043 return Writer->write();
1044}
1045
1046Error objcopy::elf::executeObjcopyOnIHex(const CommonConfig &Config,
1047 const ELFConfig &ELFConfig,
1048 MemoryBuffer &In, raw_ostream &Out) {
1049 IHexReader Reader(&In);
1050 Expected<std::unique_ptr<Object>> Obj = Reader.create(EnsureSymtab: true);
1051 if (!Obj)
1052 return Obj.takeError();
1053
1054 const ElfType OutputElfType =
1055 getOutputElfType(MI: Config.OutputArch.value_or(u: MachineInfo()));
1056 if (Error E = handleArgs(Config, ELFConfig, OutputElfType, Obj&: **Obj))
1057 return E;
1058 return writeOutput(Config, Obj&: **Obj, Out, OutputElfType);
1059}
1060
1061Error objcopy::elf::executeObjcopyOnRawBinary(const CommonConfig &Config,
1062 const ELFConfig &ELFConfig,
1063 MemoryBuffer &In,
1064 raw_ostream &Out) {
1065 BinaryReader Reader(&In, ELFConfig.NewSymbolVisibility);
1066 Expected<std::unique_ptr<Object>> Obj = Reader.create(EnsureSymtab: true);
1067 if (!Obj)
1068 return Obj.takeError();
1069
1070 // Prefer OutputArch (-O<format>) if set, otherwise fallback to BinaryArch
1071 // (-B<arch>).
1072 const ElfType OutputElfType =
1073 getOutputElfType(MI: Config.OutputArch.value_or(u: MachineInfo()));
1074 if (Error E = handleArgs(Config, ELFConfig, OutputElfType, Obj&: **Obj))
1075 return E;
1076 return writeOutput(Config, Obj&: **Obj, Out, OutputElfType);
1077}
1078
1079Error objcopy::elf::executeObjcopyOnBinary(const CommonConfig &Config,
1080 const ELFConfig &ELFConfig,
1081 object::ELFObjectFileBase &In,
1082 raw_ostream &Out) {
1083 ELFReader Reader(&In, Config.ExtractPartition);
1084 Expected<std::unique_ptr<Object>> Obj =
1085 Reader.create(EnsureSymtab: !Config.SymbolsToAdd.empty());
1086 if (!Obj)
1087 return Obj.takeError();
1088 // Prefer OutputArch (-O<format>) if set, otherwise infer it from the input.
1089 const ElfType OutputElfType = Config.OutputArch
1090 ? getOutputElfType(MI: *Config.OutputArch)
1091 : getOutputElfType(Bin: In);
1092
1093 if (Error E = handleArgs(Config, ELFConfig, OutputElfType, Obj&: **Obj))
1094 return E;
1095
1096 if (Error E = writeOutput(Config, Obj&: **Obj, Out, OutputElfType))
1097 return createFileError(F: Config.InputFilename, E: std::move(E));
1098
1099 return Error::success();
1100}
1101