forked from llvm/llvm-project
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathMachODump.cpp
10521 lines (9775 loc) · 381 KB
/
MachODump.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//===-- MachODump.cpp - Object file dumping utility for llvm --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the MachO-specific dumper for llvm-objdump.
//
//===----------------------------------------------------------------------===//
#include "MachODump.h"
#include "ObjdumpOptID.h"
#include "llvm-objdump.h"
#include "llvm-c/Disassembler.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/BinaryFormat/MachO.h"
#include "llvm/Config/config.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/Demangle/Demangle.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDisassembler/MCDisassembler.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCInstrDesc.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Object/MachO.h"
#include "llvm/Object/MachOUniversal.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/GraphWriter.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Support/ToolOutputFile.h"
#include "llvm/Support/WithColor.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cstring>
#include <system_error>
#ifdef LLVM_HAVE_LIBXAR
extern "C" {
#include <xar/xar.h>
}
#endif
using namespace llvm;
using namespace llvm::object;
using namespace llvm::objdump;
bool objdump::FirstPrivateHeader;
bool objdump::ExportsTrie;
bool objdump::Rebase;
bool objdump::Rpaths;
bool objdump::Bind;
bool objdump::LazyBind;
bool objdump::WeakBind;
static bool UseDbg;
static std::string DSYMFile;
bool objdump::FullLeadingAddr;
bool objdump::LeadingHeaders;
bool objdump::UniversalHeaders;
static bool ArchiveMemberOffsets;
bool objdump::IndirectSymbols;
bool objdump::DataInCode;
bool objdump::FunctionStarts;
bool objdump::LinkOptHints;
bool objdump::InfoPlist;
bool objdump::DylibsUsed;
bool objdump::DylibId;
bool objdump::Verbose;
bool objdump::ObjcMetaData;
std::string objdump::DisSymName;
bool objdump::SymbolicOperands;
static std::vector<std::string> ArchFlags;
static bool ArchAll = false;
static std::string ThumbTripleName;
void objdump::parseMachOOptions(const llvm::opt::InputArgList &InputArgs) {
FirstPrivateHeader = InputArgs.hasArg(OBJDUMP_private_header);
ExportsTrie = InputArgs.hasArg(OBJDUMP_exports_trie);
Rebase = InputArgs.hasArg(OBJDUMP_rebase);
Rpaths = InputArgs.hasArg(OBJDUMP_rpaths);
Bind = InputArgs.hasArg(OBJDUMP_bind);
LazyBind = InputArgs.hasArg(OBJDUMP_lazy_bind);
WeakBind = InputArgs.hasArg(OBJDUMP_weak_bind);
UseDbg = InputArgs.hasArg(OBJDUMP_g);
DSYMFile = InputArgs.getLastArgValue(OBJDUMP_dsym_EQ).str();
FullLeadingAddr = InputArgs.hasArg(OBJDUMP_full_leading_addr);
LeadingHeaders = !InputArgs.hasArg(OBJDUMP_no_leading_headers);
UniversalHeaders = InputArgs.hasArg(OBJDUMP_universal_headers);
ArchiveMemberOffsets = InputArgs.hasArg(OBJDUMP_archive_member_offsets);
IndirectSymbols = InputArgs.hasArg(OBJDUMP_indirect_symbols);
DataInCode = InputArgs.hasArg(OBJDUMP_data_in_code);
FunctionStarts = InputArgs.hasArg(OBJDUMP_function_starts);
LinkOptHints = InputArgs.hasArg(OBJDUMP_link_opt_hints);
InfoPlist = InputArgs.hasArg(OBJDUMP_info_plist);
DylibsUsed = InputArgs.hasArg(OBJDUMP_dylibs_used);
DylibId = InputArgs.hasArg(OBJDUMP_dylib_id);
Verbose = !InputArgs.hasArg(OBJDUMP_non_verbose);
ObjcMetaData = InputArgs.hasArg(OBJDUMP_objc_meta_data);
DisSymName = InputArgs.getLastArgValue(OBJDUMP_dis_symname).str();
SymbolicOperands = !InputArgs.hasArg(OBJDUMP_no_symbolic_operands);
ArchFlags = InputArgs.getAllArgValues(OBJDUMP_arch_EQ);
}
static const Target *GetTarget(const MachOObjectFile *MachOObj,
const char **McpuDefault,
const Target **ThumbTarget) {
// Figure out the target triple.
Triple TT(TripleName);
if (TripleName.empty()) {
TT = MachOObj->getArchTriple(McpuDefault);
TripleName = TT.str();
}
if (TT.getArch() == Triple::arm) {
// We've inferred a 32-bit ARM target from the object file. All MachO CPUs
// that support ARM are also capable of Thumb mode.
Triple ThumbTriple = TT;
std::string ThumbName = (Twine("thumb") + TT.getArchName().substr(3)).str();
ThumbTriple.setArchName(ThumbName);
ThumbTripleName = ThumbTriple.str();
}
// Get the target specific parser.
std::string Error;
const Target *TheTarget = TargetRegistry::lookupTarget(TripleName, Error);
if (TheTarget && ThumbTripleName.empty())
return TheTarget;
*ThumbTarget = TargetRegistry::lookupTarget(ThumbTripleName, Error);
if (*ThumbTarget)
return TheTarget;
WithColor::error(errs(), "llvm-objdump") << "unable to get target for '";
if (!TheTarget)
errs() << TripleName;
else
errs() << ThumbTripleName;
errs() << "', see --version and --triple.\n";
return nullptr;
}
namespace {
struct SymbolSorter {
bool operator()(const SymbolRef &A, const SymbolRef &B) {
Expected<SymbolRef::Type> ATypeOrErr = A.getType();
if (!ATypeOrErr)
reportError(ATypeOrErr.takeError(), A.getObject()->getFileName());
SymbolRef::Type AType = *ATypeOrErr;
Expected<SymbolRef::Type> BTypeOrErr = B.getType();
if (!BTypeOrErr)
reportError(BTypeOrErr.takeError(), B.getObject()->getFileName());
SymbolRef::Type BType = *BTypeOrErr;
uint64_t AAddr =
(AType != SymbolRef::ST_Function) ? 0 : cantFail(A.getValue());
uint64_t BAddr =
(BType != SymbolRef::ST_Function) ? 0 : cantFail(B.getValue());
return AAddr < BAddr;
}
};
} // namespace
// Types for the storted data in code table that is built before disassembly
// and the predicate function to sort them.
typedef std::pair<uint64_t, DiceRef> DiceTableEntry;
typedef std::vector<DiceTableEntry> DiceTable;
typedef DiceTable::iterator dice_table_iterator;
#ifdef LLVM_HAVE_LIBXAR
namespace {
struct ScopedXarFile {
xar_t xar;
ScopedXarFile(const char *filename, int32_t flags)
: xar(xar_open(filename, flags)) {}
~ScopedXarFile() {
if (xar)
xar_close(xar);
}
ScopedXarFile(const ScopedXarFile &) = delete;
ScopedXarFile &operator=(const ScopedXarFile &) = delete;
operator xar_t() { return xar; }
};
struct ScopedXarIter {
xar_iter_t iter;
ScopedXarIter() : iter(xar_iter_new()) {}
~ScopedXarIter() {
if (iter)
xar_iter_free(iter);
}
ScopedXarIter(const ScopedXarIter &) = delete;
ScopedXarIter &operator=(const ScopedXarIter &) = delete;
operator xar_iter_t() { return iter; }
};
} // namespace
#endif // defined(LLVM_HAVE_LIBXAR)
// This is used to search for a data in code table entry for the PC being
// disassembled. The j parameter has the PC in j.first. A single data in code
// table entry can cover many bytes for each of its Kind's. So if the offset,
// aka the i.first value, of the data in code table entry plus its Length
// covers the PC being searched for this will return true. If not it will
// return false.
static bool compareDiceTableEntries(const DiceTableEntry &i,
const DiceTableEntry &j) {
uint16_t Length;
i.second.getLength(Length);
return j.first >= i.first && j.first < i.first + Length;
}
static uint64_t DumpDataInCode(const uint8_t *bytes, uint64_t Length,
unsigned short Kind) {
uint32_t Value, Size = 1;
switch (Kind) {
default:
case MachO::DICE_KIND_DATA:
if (Length >= 4) {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 4), outs());
Value = bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
outs() << "\t.long " << Value;
Size = 4;
} else if (Length >= 2) {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[1] << 8 | bytes[0];
outs() << "\t.short " << Value;
Size = 2;
} else {
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[0];
outs() << "\t.byte " << Value;
Size = 1;
}
if (Kind == MachO::DICE_KIND_DATA)
outs() << "\t@ KIND_DATA\n";
else
outs() << "\t@ data in code kind = " << Kind << "\n";
break;
case MachO::DICE_KIND_JUMP_TABLE8:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 1), outs());
Value = bytes[0];
outs() << "\t.byte " << format("%3u", Value) << "\t@ KIND_JUMP_TABLE8\n";
Size = 1;
break;
case MachO::DICE_KIND_JUMP_TABLE16:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 2), outs());
Value = bytes[1] << 8 | bytes[0];
outs() << "\t.short " << format("%5u", Value & 0xffff)
<< "\t@ KIND_JUMP_TABLE16\n";
Size = 2;
break;
case MachO::DICE_KIND_JUMP_TABLE32:
case MachO::DICE_KIND_ABS_JUMP_TABLE32:
if (ShowRawInsn)
dumpBytes(makeArrayRef(bytes, 4), outs());
Value = bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
outs() << "\t.long " << Value;
if (Kind == MachO::DICE_KIND_JUMP_TABLE32)
outs() << "\t@ KIND_JUMP_TABLE32\n";
else
outs() << "\t@ KIND_ABS_JUMP_TABLE32\n";
Size = 4;
break;
}
return Size;
}
static void getSectionsAndSymbols(MachOObjectFile *MachOObj,
std::vector<SectionRef> &Sections,
std::vector<SymbolRef> &Symbols,
SmallVectorImpl<uint64_t> &FoundFns,
uint64_t &BaseSegmentAddress) {
const StringRef FileName = MachOObj->getFileName();
for (const SymbolRef &Symbol : MachOObj->symbols()) {
StringRef SymName = unwrapOrError(Symbol.getName(), FileName);
if (!SymName.startswith("ltmp"))
Symbols.push_back(Symbol);
}
append_range(Sections, MachOObj->sections());
bool BaseSegmentAddressSet = false;
for (const auto &Command : MachOObj->load_commands()) {
if (Command.C.cmd == MachO::LC_FUNCTION_STARTS) {
// We found a function starts segment, parse the addresses for later
// consumption.
MachO::linkedit_data_command LLC =
MachOObj->getLinkeditDataLoadCommand(Command);
MachOObj->ReadULEB128s(LLC.dataoff, FoundFns);
} else if (Command.C.cmd == MachO::LC_SEGMENT) {
MachO::segment_command SLC = MachOObj->getSegmentLoadCommand(Command);
StringRef SegName = SLC.segname;
if (!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
BaseSegmentAddressSet = true;
BaseSegmentAddress = SLC.vmaddr;
}
} else if (Command.C.cmd == MachO::LC_SEGMENT_64) {
MachO::segment_command_64 SLC = MachOObj->getSegment64LoadCommand(Command);
StringRef SegName = SLC.segname;
if (!BaseSegmentAddressSet && SegName != "__PAGEZERO") {
BaseSegmentAddressSet = true;
BaseSegmentAddress = SLC.vmaddr;
}
}
}
}
static bool DumpAndSkipDataInCode(uint64_t PC, const uint8_t *bytes,
DiceTable &Dices, uint64_t &InstSize) {
// Check the data in code table here to see if this is data not an
// instruction to be disassembled.
DiceTable Dice;
Dice.push_back(std::make_pair(PC, DiceRef()));
dice_table_iterator DTI =
std::search(Dices.begin(), Dices.end(), Dice.begin(), Dice.end(),
compareDiceTableEntries);
if (DTI != Dices.end()) {
uint16_t Length;
DTI->second.getLength(Length);
uint16_t Kind;
DTI->second.getKind(Kind);
InstSize = DumpDataInCode(bytes, Length, Kind);
if ((Kind == MachO::DICE_KIND_JUMP_TABLE8) &&
(PC == (DTI->first + Length - 1)) && (Length & 1))
InstSize++;
return true;
}
return false;
}
static void printRelocationTargetName(const MachOObjectFile *O,
const MachO::any_relocation_info &RE,
raw_string_ostream &Fmt) {
// Target of a scattered relocation is an address. In the interest of
// generating pretty output, scan through the symbol table looking for a
// symbol that aligns with that address. If we find one, print it.
// Otherwise, we just print the hex address of the target.
const StringRef FileName = O->getFileName();
if (O->isRelocationScattered(RE)) {
uint32_t Val = O->getPlainRelocationSymbolNum(RE);
for (const SymbolRef &Symbol : O->symbols()) {
uint64_t Addr = unwrapOrError(Symbol.getAddress(), FileName);
if (Addr != Val)
continue;
Fmt << unwrapOrError(Symbol.getName(), FileName);
return;
}
// If we couldn't find a symbol that this relocation refers to, try
// to find a section beginning instead.
for (const SectionRef &Section : ToolSectionFilter(*O)) {
uint64_t Addr = Section.getAddress();
if (Addr != Val)
continue;
StringRef NameOrErr = unwrapOrError(Section.getName(), O->getFileName());
Fmt << NameOrErr;
return;
}
Fmt << format("0x%x", Val);
return;
}
StringRef S;
bool isExtern = O->getPlainRelocationExternal(RE);
uint64_t Val = O->getPlainRelocationSymbolNum(RE);
if (O->getAnyRelocationType(RE) == MachO::ARM64_RELOC_ADDEND &&
(O->getArch() == Triple::aarch64 || O->getArch() == Triple::aarch64_be)) {
Fmt << format("0x%0" PRIx64, Val);
return;
}
if (isExtern) {
symbol_iterator SI = O->symbol_begin();
std::advance(SI, Val);
S = unwrapOrError(SI->getName(), FileName);
} else {
section_iterator SI = O->section_begin();
// Adjust for the fact that sections are 1-indexed.
if (Val == 0) {
Fmt << "0 (?,?)";
return;
}
uint32_t I = Val - 1;
while (I != 0 && SI != O->section_end()) {
--I;
std::advance(SI, 1);
}
if (SI == O->section_end()) {
Fmt << Val << " (?,?)";
} else {
if (Expected<StringRef> NameOrErr = SI->getName())
S = *NameOrErr;
else
consumeError(NameOrErr.takeError());
}
}
Fmt << S;
}
Error objdump::getMachORelocationValueString(const MachOObjectFile *Obj,
const RelocationRef &RelRef,
SmallVectorImpl<char> &Result) {
DataRefImpl Rel = RelRef.getRawDataRefImpl();
MachO::any_relocation_info RE = Obj->getRelocation(Rel);
unsigned Arch = Obj->getArch();
std::string FmtBuf;
raw_string_ostream Fmt(FmtBuf);
unsigned Type = Obj->getAnyRelocationType(RE);
bool IsPCRel = Obj->getAnyRelocationPCRel(RE);
// Determine any addends that should be displayed with the relocation.
// These require decoding the relocation type, which is triple-specific.
// X86_64 has entirely custom relocation types.
if (Arch == Triple::x86_64) {
switch (Type) {
case MachO::X86_64_RELOC_GOT_LOAD:
case MachO::X86_64_RELOC_GOT: {
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@GOT";
if (IsPCRel)
Fmt << "PCREL";
break;
}
case MachO::X86_64_RELOC_SUBTRACTOR: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86_64_RELOC_SUBTRACTOR must be followed by a relocation of type
// X86_64_RELOC_UNSIGNED.
// NOTE: Scattered relocations don't exist on x86_64.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::X86_64_RELOC_UNSIGNED)
reportError(Obj->getFileName(), "Expected X86_64_RELOC_UNSIGNED after "
"X86_64_RELOC_SUBTRACTOR.");
// The X86_64_RELOC_UNSIGNED contains the minuend symbol;
// X86_64_RELOC_SUBTRACTOR contains the subtrahend.
printRelocationTargetName(Obj, RENext, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RE, Fmt);
break;
}
case MachO::X86_64_RELOC_TLV:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@TLV";
if (IsPCRel)
Fmt << "P";
break;
case MachO::X86_64_RELOC_SIGNED_1:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-1";
break;
case MachO::X86_64_RELOC_SIGNED_2:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-2";
break;
case MachO::X86_64_RELOC_SIGNED_4:
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-4";
break;
default:
printRelocationTargetName(Obj, RE, Fmt);
break;
}
// X86 and ARM share some relocation types in common.
} else if (Arch == Triple::x86 || Arch == Triple::arm ||
Arch == Triple::ppc) {
// Generic relocation types...
switch (Type) {
case MachO::GENERIC_RELOC_PAIR: // prints no info
return Error::success();
case MachO::GENERIC_RELOC_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_SECTDIFF.");
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
break;
}
}
if (Arch == Triple::x86 || Arch == Triple::ppc) {
switch (Type) {
case MachO::GENERIC_RELOC_LOCAL_SECTDIFF: {
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// X86 sect diff's must be followed by a relocation of type
// GENERIC_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::GENERIC_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected GENERIC_RELOC_PAIR after "
"GENERIC_RELOC_LOCAL_SECTDIFF.");
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
break;
}
case MachO::GENERIC_RELOC_TLV: {
printRelocationTargetName(Obj, RE, Fmt);
Fmt << "@TLV";
if (IsPCRel)
Fmt << "P";
break;
}
default:
printRelocationTargetName(Obj, RE, Fmt);
}
} else { // ARM-specific relocations
switch (Type) {
case MachO::ARM_RELOC_HALF:
case MachO::ARM_RELOC_HALF_SECTDIFF: {
// Half relocations steal a bit from the length field to encode
// whether this is an upper16 or a lower16 relocation.
bool isUpper = (Obj->getAnyRelocationLength(RE) & 0x1) == 1;
if (isUpper)
Fmt << ":upper16:(";
else
Fmt << ":lower16:(";
printRelocationTargetName(Obj, RE, Fmt);
DataRefImpl RelNext = Rel;
Obj->moveRelocationNext(RelNext);
MachO::any_relocation_info RENext = Obj->getRelocation(RelNext);
// ARM half relocs must be followed by a relocation of type
// ARM_RELOC_PAIR.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != MachO::ARM_RELOC_PAIR)
reportError(Obj->getFileName(), "Expected ARM_RELOC_PAIR after "
"ARM_RELOC_HALF");
// NOTE: The half of the target virtual address is stashed in the
// address field of the secondary relocation, but we can't reverse
// engineer the constant offset from it without decoding the movw/movt
// instruction to find the other half in its immediate field.
// ARM_RELOC_HALF_SECTDIFF encodes the second section in the
// symbol/section pointer of the follow-on relocation.
if (Type == MachO::ARM_RELOC_HALF_SECTDIFF) {
Fmt << "-";
printRelocationTargetName(Obj, RENext, Fmt);
}
Fmt << ")";
break;
}
default: {
printRelocationTargetName(Obj, RE, Fmt);
}
}
}
} else
printRelocationTargetName(Obj, RE, Fmt);
Fmt.flush();
Result.append(FmtBuf.begin(), FmtBuf.end());
return Error::success();
}
static void PrintIndirectSymbolTable(MachOObjectFile *O, bool verbose,
uint32_t n, uint32_t count,
uint32_t stride, uint64_t addr) {
MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
uint32_t nindirectsyms = Dysymtab.nindirectsyms;
if (n > nindirectsyms)
outs() << " (entries start past the end of the indirect symbol "
"table) (reserved1 field greater than the table size)";
else if (n + count > nindirectsyms)
outs() << " (entries extends past the end of the indirect symbol "
"table)";
outs() << "\n";
uint32_t cputype = O->getHeader().cputype;
if (cputype & MachO::CPU_ARCH_ABI64)
outs() << "address index";
else
outs() << "address index";
if (verbose)
outs() << " name\n";
else
outs() << "\n";
for (uint32_t j = 0; j < count && n + j < nindirectsyms; j++) {
if (cputype & MachO::CPU_ARCH_ABI64)
outs() << format("0x%016" PRIx64, addr + j * stride) << " ";
else
outs() << format("0x%08" PRIx32, (uint32_t)addr + j * stride) << " ";
MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
uint32_t indirect_symbol = O->getIndirectSymbolTableEntry(Dysymtab, n + j);
if (indirect_symbol == MachO::INDIRECT_SYMBOL_LOCAL) {
outs() << "LOCAL\n";
continue;
}
if (indirect_symbol ==
(MachO::INDIRECT_SYMBOL_LOCAL | MachO::INDIRECT_SYMBOL_ABS)) {
outs() << "LOCAL ABSOLUTE\n";
continue;
}
if (indirect_symbol == MachO::INDIRECT_SYMBOL_ABS) {
outs() << "ABSOLUTE\n";
continue;
}
outs() << format("%5u ", indirect_symbol);
if (verbose) {
MachO::symtab_command Symtab = O->getSymtabLoadCommand();
if (indirect_symbol < Symtab.nsyms) {
symbol_iterator Sym = O->getSymbolByIndex(indirect_symbol);
SymbolRef Symbol = *Sym;
outs() << unwrapOrError(Symbol.getName(), O->getFileName());
} else {
outs() << "?";
}
}
outs() << "\n";
}
}
static void PrintIndirectSymbols(MachOObjectFile *O, bool verbose) {
for (const auto &Load : O->load_commands()) {
if (Load.C.cmd == MachO::LC_SEGMENT_64) {
MachO::segment_command_64 Seg = O->getSegment64LoadCommand(Load);
for (unsigned J = 0; J < Seg.nsects; ++J) {
MachO::section_64 Sec = O->getSection64(Load, J);
uint32_t section_type = Sec.flags & MachO::SECTION_TYPE;
if (section_type == MachO::S_NON_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_DYLIB_SYMBOL_POINTERS ||
section_type == MachO::S_THREAD_LOCAL_VARIABLE_POINTERS ||
section_type == MachO::S_SYMBOL_STUBS) {
uint32_t stride;
if (section_type == MachO::S_SYMBOL_STUBS)
stride = Sec.reserved2;
else
stride = 8;
if (stride == 0) {
outs() << "Can't print indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") "
<< "(size of stubs in reserved2 field is zero)\n";
continue;
}
uint32_t count = Sec.size / stride;
outs() << "Indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") " << count << " entries";
uint32_t n = Sec.reserved1;
PrintIndirectSymbolTable(O, verbose, n, count, stride, Sec.addr);
}
}
} else if (Load.C.cmd == MachO::LC_SEGMENT) {
MachO::segment_command Seg = O->getSegmentLoadCommand(Load);
for (unsigned J = 0; J < Seg.nsects; ++J) {
MachO::section Sec = O->getSection(Load, J);
uint32_t section_type = Sec.flags & MachO::SECTION_TYPE;
if (section_type == MachO::S_NON_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_SYMBOL_POINTERS ||
section_type == MachO::S_LAZY_DYLIB_SYMBOL_POINTERS ||
section_type == MachO::S_THREAD_LOCAL_VARIABLE_POINTERS ||
section_type == MachO::S_SYMBOL_STUBS) {
uint32_t stride;
if (section_type == MachO::S_SYMBOL_STUBS)
stride = Sec.reserved2;
else
stride = 4;
if (stride == 0) {
outs() << "Can't print indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") "
<< "(size of stubs in reserved2 field is zero)\n";
continue;
}
uint32_t count = Sec.size / stride;
outs() << "Indirect symbols for (" << Sec.segname << ","
<< Sec.sectname << ") " << count << " entries";
uint32_t n = Sec.reserved1;
PrintIndirectSymbolTable(O, verbose, n, count, stride, Sec.addr);
}
}
}
}
}
static void PrintRType(const uint64_t cputype, const unsigned r_type) {
static char const *generic_r_types[] = {
"VANILLA ", "PAIR ", "SECTDIF ", "PBLAPTR ", "LOCSDIF ", "TLV ",
" 6 (?) ", " 7 (?) ", " 8 (?) ", " 9 (?) ", " 10 (?) ", " 11 (?) ",
" 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *x86_64_r_types[] = {
"UNSIGND ", "SIGNED ", "BRANCH ", "GOT_LD ", "GOT ", "SUB ",
"SIGNED1 ", "SIGNED2 ", "SIGNED4 ", "TLV ", " 10 (?) ", " 11 (?) ",
" 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *arm_r_types[] = {
"VANILLA ", "PAIR ", "SECTDIFF", "LOCSDIF ", "PBLAPTR ",
"BR24 ", "T_BR22 ", "T_BR32 ", "HALF ", "HALFDIF ",
" 10 (?) ", " 11 (?) ", " 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
static char const *arm64_r_types[] = {
"UNSIGND ", "SUB ", "BR26 ", "PAGE21 ", "PAGOF12 ",
"GOTLDP ", "GOTLDPOF", "PTRTGOT ", "TLVLDP ", "TLVLDPOF",
"ADDEND ", " 11 (?) ", " 12 (?) ", " 13 (?) ", " 14 (?) ", " 15 (?) "
};
if (r_type > 0xf){
outs() << format("%-7u", r_type) << " ";
return;
}
switch (cputype) {
case MachO::CPU_TYPE_I386:
outs() << generic_r_types[r_type];
break;
case MachO::CPU_TYPE_X86_64:
outs() << x86_64_r_types[r_type];
break;
case MachO::CPU_TYPE_ARM:
outs() << arm_r_types[r_type];
break;
case MachO::CPU_TYPE_ARM64:
case MachO::CPU_TYPE_ARM64_32:
outs() << arm64_r_types[r_type];
break;
default:
outs() << format("%-7u ", r_type);
}
}
static void PrintRLength(const uint64_t cputype, const unsigned r_type,
const unsigned r_length, const bool previous_arm_half){
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF || previous_arm_half == true)) {
if ((r_length & 0x1) == 0)
outs() << "lo/";
else
outs() << "hi/";
if ((r_length & 0x1) == 0)
outs() << "arm ";
else
outs() << "thm ";
} else {
switch (r_length) {
case 0:
outs() << "byte ";
break;
case 1:
outs() << "word ";
break;
case 2:
outs() << "long ";
break;
case 3:
if (cputype == MachO::CPU_TYPE_X86_64)
outs() << "quad ";
else
outs() << format("?(%2d) ", r_length);
break;
default:
outs() << format("?(%2d) ", r_length);
}
}
}
static void PrintRelocationEntries(const MachOObjectFile *O,
const relocation_iterator Begin,
const relocation_iterator End,
const uint64_t cputype,
const bool verbose) {
const MachO::symtab_command Symtab = O->getSymtabLoadCommand();
bool previous_arm_half = false;
bool previous_sectdiff = false;
uint32_t sectdiff_r_type = 0;
for (relocation_iterator Reloc = Begin; Reloc != End; ++Reloc) {
const DataRefImpl Rel = Reloc->getRawDataRefImpl();
const MachO::any_relocation_info RE = O->getRelocation(Rel);
const unsigned r_type = O->getAnyRelocationType(RE);
const bool r_scattered = O->isRelocationScattered(RE);
const unsigned r_pcrel = O->getAnyRelocationPCRel(RE);
const unsigned r_length = O->getAnyRelocationLength(RE);
const unsigned r_address = O->getAnyRelocationAddress(RE);
const bool r_extern = (r_scattered ? false :
O->getPlainRelocationExternal(RE));
const uint32_t r_value = (r_scattered ?
O->getScatteredRelocationValue(RE) : 0);
const unsigned r_symbolnum = (r_scattered ? 0 :
O->getPlainRelocationSymbolNum(RE));
if (r_scattered && cputype != MachO::CPU_TYPE_X86_64) {
if (verbose) {
// scattered: address
if ((cputype == MachO::CPU_TYPE_I386 &&
r_type == MachO::GENERIC_RELOC_PAIR) ||
(cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR))
outs() << " ";
else
outs() << format("%08x ", (unsigned int)r_address);
// scattered: pcrel
if (r_pcrel)
outs() << "True ";
else
outs() << "False ";
// scattered: length
PrintRLength(cputype, r_type, r_length, previous_arm_half);
// scattered: extern & type
outs() << "n/a ";
PrintRType(cputype, r_type);
// scattered: scattered & value
outs() << format("True 0x%08x", (unsigned int)r_value);
if (previous_sectdiff == false) {
if ((cputype == MachO::CPU_TYPE_ARM &&
r_type == MachO::ARM_RELOC_PAIR))
outs() << format(" half = 0x%04x ", (unsigned int)r_address);
} else if (cputype == MachO::CPU_TYPE_ARM &&
sectdiff_r_type == MachO::ARM_RELOC_HALF_SECTDIFF)
outs() << format(" other_half = 0x%04x ", (unsigned int)r_address);
if ((cputype == MachO::CPU_TYPE_I386 &&
(r_type == MachO::GENERIC_RELOC_SECTDIFF ||
r_type == MachO::GENERIC_RELOC_LOCAL_SECTDIFF)) ||
(cputype == MachO::CPU_TYPE_ARM &&
(sectdiff_r_type == MachO::ARM_RELOC_SECTDIFF ||
sectdiff_r_type == MachO::ARM_RELOC_LOCAL_SECTDIFF ||
sectdiff_r_type == MachO::ARM_RELOC_HALF_SECTDIFF))) {
previous_sectdiff = true;
sectdiff_r_type = r_type;
} else {
previous_sectdiff = false;
sectdiff_r_type = 0;
}
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF))
previous_arm_half = true;
else
previous_arm_half = false;
outs() << "\n";
}
else {
// scattered: address pcrel length extern type scattered value
outs() << format("%08x %1d %-2d n/a %-7d 1 0x%08x\n",
(unsigned int)r_address, r_pcrel, r_length, r_type,
(unsigned int)r_value);
}
}
else {
if (verbose) {
// plain: address
if (cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR)
outs() << " ";
else
outs() << format("%08x ", (unsigned int)r_address);
// plain: pcrel
if (r_pcrel)
outs() << "True ";
else
outs() << "False ";
// plain: length
PrintRLength(cputype, r_type, r_length, previous_arm_half);
if (r_extern) {
// plain: extern & type & scattered
outs() << "True ";
PrintRType(cputype, r_type);
outs() << "False ";
// plain: symbolnum/value
if (r_symbolnum > Symtab.nsyms)
outs() << format("?(%d)\n", r_symbolnum);
else {
SymbolRef Symbol = *O->getSymbolByIndex(r_symbolnum);
Expected<StringRef> SymNameNext = Symbol.getName();
const char *name = nullptr;
if (SymNameNext)
name = SymNameNext->data();
if (name == nullptr)
outs() << format("?(%d)\n", r_symbolnum);
else
outs() << name << "\n";
}
}
else {
// plain: extern & type & scattered
outs() << "False ";
PrintRType(cputype, r_type);
outs() << "False ";
// plain: symbolnum/value
if (cputype == MachO::CPU_TYPE_ARM && r_type == MachO::ARM_RELOC_PAIR)
outs() << format("other_half = 0x%04x\n", (unsigned int)r_address);
else if ((cputype == MachO::CPU_TYPE_ARM64 ||
cputype == MachO::CPU_TYPE_ARM64_32) &&
r_type == MachO::ARM64_RELOC_ADDEND)
outs() << format("addend = 0x%06x\n", (unsigned int)r_symbolnum);
else {
outs() << format("%d ", r_symbolnum);
if (r_symbolnum == MachO::R_ABS)
outs() << "R_ABS\n";
else {
// in this case, r_symbolnum is actually a 1-based section number
uint32_t nsects = O->section_end()->getRawDataRefImpl().d.a;
if (r_symbolnum > 0 && r_symbolnum <= nsects) {
object::DataRefImpl DRI;
DRI.d.a = r_symbolnum-1;
StringRef SegName = O->getSectionFinalSegmentName(DRI);
if (Expected<StringRef> NameOrErr = O->getSectionName(DRI))
outs() << "(" << SegName << "," << *NameOrErr << ")\n";
else
outs() << "(?,?)\n";
}
else {
outs() << "(?,?)\n";
}
}
}
}
if (cputype == MachO::CPU_TYPE_ARM &&
(r_type == MachO::ARM_RELOC_HALF ||
r_type == MachO::ARM_RELOC_HALF_SECTDIFF))
previous_arm_half = true;
else
previous_arm_half = false;
}
else {
// plain: address pcrel length extern type scattered symbolnum/section
outs() << format("%08x %1d %-2d %1d %-7d 0 %d\n",
(unsigned int)r_address, r_pcrel, r_length, r_extern,
r_type, r_symbolnum);
}
}
}
}
static void PrintRelocations(const MachOObjectFile *O, const bool verbose) {
const uint64_t cputype = O->getHeader().cputype;
const MachO::dysymtab_command Dysymtab = O->getDysymtabLoadCommand();
if (Dysymtab.nextrel != 0) {
outs() << "External relocation information " << Dysymtab.nextrel
<< " entries";
outs() << "\naddress pcrel length extern type scattered "
"symbolnum/value\n";
PrintRelocationEntries(O, O->extrel_begin(), O->extrel_end(), cputype,
verbose);
}
if (Dysymtab.nlocrel != 0) {
outs() << format("Local relocation information %u entries",
Dysymtab.nlocrel);
outs() << "\naddress pcrel length extern type scattered "
"symbolnum/value\n";
PrintRelocationEntries(O, O->locrel_begin(), O->locrel_end(), cputype,
verbose);
}
for (const auto &Load : O->load_commands()) {