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[Alignment][NFC] Value::getPointerAlignment returns MaybeAlign
[llvm-core.git] / tools / llvm-readobj / ARMEHABIPrinter.h
blob2c0912038c3140ffd4880f7682df02de7f48a0cf
1 //===--- ARMEHABIPrinter.h - ARM EHABI Unwind Information Printer ----------===//
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 #ifndef LLVM_TOOLS_LLVM_READOBJ_ARMEHABIPRINTER_H
10 #define LLVM_TOOLS_LLVM_READOBJ_ARMEHABIPRINTER_H
11
12 #include "Error.h"
13 #include "llvm-readobj.h"
14 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/Object/ELF.h"
16 #include "llvm/Object/ELFTypes.h"
17 #include "llvm/Support/ARMEHABI.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/Endian.h"
20 #include "llvm/Support/Format.h"
21 #include "llvm/Support/ScopedPrinter.h"
22 #include "llvm/Support/type_traits.h"
23
24 namespace llvm {
25 namespace ARM {
26 namespace EHABI {
27
28 class OpcodeDecoder {
29 ScopedPrinter &SW;
30 raw_ostream &OS;
31
32 struct RingEntry {
33 uint8_t Mask;
34 uint8_t Value;
35 void (OpcodeDecoder::*Routine)(const uint8_t *Opcodes, unsigned &OI);
36 };
37 static ArrayRef<RingEntry> ring();
38
39 void Decode_00xxxxxx(const uint8_t *Opcodes, unsigned &OI);
40 void Decode_01xxxxxx(const uint8_t *Opcodes, unsigned &OI);
41 void Decode_1000iiii_iiiiiiii(const uint8_t *Opcodes, unsigned &OI);
42 void Decode_10011101(const uint8_t *Opcodes, unsigned &OI);
43 void Decode_10011111(const uint8_t *Opcodes, unsigned &OI);
44 void Decode_1001nnnn(const uint8_t *Opcodes, unsigned &OI);
45 void Decode_10100nnn(const uint8_t *Opcodes, unsigned &OI);
46 void Decode_10101nnn(const uint8_t *Opcodes, unsigned &OI);
47 void Decode_10110000(const uint8_t *Opcodes, unsigned &OI);
48 void Decode_10110001_0000iiii(const uint8_t *Opcodes, unsigned &OI);
49 void Decode_10110010_uleb128(const uint8_t *Opcodes, unsigned &OI);
50 void Decode_10110011_sssscccc(const uint8_t *Opcodes, unsigned &OI);
51 void Decode_101101nn(const uint8_t *Opcodes, unsigned &OI);
52 void Decode_10111nnn(const uint8_t *Opcodes, unsigned &OI);
53 void Decode_11000110_sssscccc(const uint8_t *Opcodes, unsigned &OI);
54 void Decode_11000111_0000iiii(const uint8_t *Opcodes, unsigned &OI);
55 void Decode_11001000_sssscccc(const uint8_t *Opcodes, unsigned &OI);
56 void Decode_11001001_sssscccc(const uint8_t *Opcodes, unsigned &OI);
57 void Decode_11001yyy(const uint8_t *Opcodes, unsigned &OI);
58 void Decode_11000nnn(const uint8_t *Opcodes, unsigned &OI);
59 void Decode_11010nnn(const uint8_t *Opcodes, unsigned &OI);
60 void Decode_11xxxyyy(const uint8_t *Opcodes, unsigned &OI);
61
62 void PrintGPR(uint16_t GPRMask);
63 void PrintRegisters(uint32_t Mask, StringRef Prefix);
64
65 public:
66 OpcodeDecoder(ScopedPrinter &SW) : SW(SW), OS(SW.getOStream()) {}
67 void Decode(const uint8_t *Opcodes, off_t Offset, size_t Length);
68 };
69
70 inline ArrayRef<OpcodeDecoder::RingEntry> OpcodeDecoder::ring() {
71 static const OpcodeDecoder::RingEntry Ring[] = {
72 {0xc0, 0x00, &OpcodeDecoder::Decode_00xxxxxx},
73 {0xc0, 0x40, &OpcodeDecoder::Decode_01xxxxxx},
74 {0xf0, 0x80, &OpcodeDecoder::Decode_1000iiii_iiiiiiii},
75 {0xff, 0x9d, &OpcodeDecoder::Decode_10011101},
76 {0xff, 0x9f, &OpcodeDecoder::Decode_10011111},
77 {0xf0, 0x90, &OpcodeDecoder::Decode_1001nnnn},
78 {0xf8, 0xa0, &OpcodeDecoder::Decode_10100nnn},
79 {0xf8, 0xa8, &OpcodeDecoder::Decode_10101nnn},
80 {0xff, 0xb0, &OpcodeDecoder::Decode_10110000},
81 {0xff, 0xb1, &OpcodeDecoder::Decode_10110001_0000iiii},
82 {0xff, 0xb2, &OpcodeDecoder::Decode_10110010_uleb128},
83 {0xff, 0xb3, &OpcodeDecoder::Decode_10110011_sssscccc},
84 {0xfc, 0xb4, &OpcodeDecoder::Decode_101101nn},
85 {0xf8, 0xb8, &OpcodeDecoder::Decode_10111nnn},
86 {0xff, 0xc6, &OpcodeDecoder::Decode_11000110_sssscccc},
87 {0xff, 0xc7, &OpcodeDecoder::Decode_11000111_0000iiii},
88 {0xff, 0xc8, &OpcodeDecoder::Decode_11001000_sssscccc},
89 {0xff, 0xc9, &OpcodeDecoder::Decode_11001001_sssscccc},
90 {0xc8, 0xc8, &OpcodeDecoder::Decode_11001yyy},
91 {0xf8, 0xc0, &OpcodeDecoder::Decode_11000nnn},
92 {0xf8, 0xd0, &OpcodeDecoder::Decode_11010nnn},
93 {0xc0, 0xc0, &OpcodeDecoder::Decode_11xxxyyy},
94 };
95 return makeArrayRef(Ring);
96 }
97
98 inline void OpcodeDecoder::Decode_00xxxxxx(const uint8_t *Opcodes,
99 unsigned &OI) {
100 uint8_t Opcode = Opcodes[OI++ ^ 3];
101 SW.startLine() << format("0x%02X ; vsp = vsp + %u\n", Opcode,
102 ((Opcode & 0x3f) << 2) + 4);
103 }
104 inline void OpcodeDecoder::Decode_01xxxxxx(const uint8_t *Opcodes,
105 unsigned &OI) {
106 uint8_t Opcode = Opcodes[OI++ ^ 3];
107 SW.startLine() << format("0x%02X ; vsp = vsp - %u\n", Opcode,
108 ((Opcode & 0x3f) << 2) + 4);
109 }
110 inline void OpcodeDecoder::Decode_1000iiii_iiiiiiii(const uint8_t *Opcodes,
111 unsigned &OI) {
112 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
113 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
114
115 uint16_t GPRMask = (Opcode1 << 4) | ((Opcode0 & 0x0f) << 12);
116 SW.startLine()
117 << format("0x%02X 0x%02X ; %s",
118 Opcode0, Opcode1, GPRMask ? "pop " : "refuse to unwind");
119 if (GPRMask)
120 PrintGPR(GPRMask);
121 OS << '\n';
122 }
123 inline void OpcodeDecoder::Decode_10011101(const uint8_t *Opcodes,
124 unsigned &OI) {
125 uint8_t Opcode = Opcodes[OI++ ^ 3];
126 SW.startLine() << format("0x%02X ; reserved (ARM MOVrr)\n", Opcode);
127 }
128 inline void OpcodeDecoder::Decode_10011111(const uint8_t *Opcodes,
129 unsigned &OI) {
130 uint8_t Opcode = Opcodes[OI++ ^ 3];
131 SW.startLine() << format("0x%02X ; reserved (WiMMX MOVrr)\n", Opcode);
132 }
133 inline void OpcodeDecoder::Decode_1001nnnn(const uint8_t *Opcodes,
134 unsigned &OI) {
135 uint8_t Opcode = Opcodes[OI++ ^ 3];
136 SW.startLine() << format("0x%02X ; vsp = r%u\n", Opcode, (Opcode & 0x0f));
137 }
138 inline void OpcodeDecoder::Decode_10100nnn(const uint8_t *Opcodes,
139 unsigned &OI) {
140 uint8_t Opcode = Opcodes[OI++ ^ 3];
141 SW.startLine() << format("0x%02X ; pop ", Opcode);
142 PrintGPR((((1 << ((Opcode & 0x7) + 1)) - 1) << 4));
143 OS << '\n';
144 }
145 inline void OpcodeDecoder::Decode_10101nnn(const uint8_t *Opcodes,
146 unsigned &OI) {
147 uint8_t Opcode = Opcodes[OI++ ^ 3];
148 SW.startLine() << format("0x%02X ; pop ", Opcode);
149 PrintGPR((((1 << ((Opcode & 0x7) + 1)) - 1) << 4) | (1 << 14));
150 OS << '\n';
151 }
152 inline void OpcodeDecoder::Decode_10110000(const uint8_t *Opcodes,
153 unsigned &OI) {
154 uint8_t Opcode = Opcodes[OI++ ^ 3];
155 SW.startLine() << format("0x%02X ; finish\n", Opcode);
156 }
157 inline void OpcodeDecoder::Decode_10110001_0000iiii(const uint8_t *Opcodes,
158 unsigned &OI) {
159 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
160 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
161
162 SW.startLine()
163 << format("0x%02X 0x%02X ; %s", Opcode0, Opcode1,
164 ((Opcode1 & 0xf0) || Opcode1 == 0x00) ? "spare" : "pop ");
165 if (((Opcode1 & 0xf0) == 0x00) && Opcode1)
166 PrintGPR((Opcode1 & 0x0f));
167 OS << '\n';
168 }
169 inline void OpcodeDecoder::Decode_10110010_uleb128(const uint8_t *Opcodes,
170 unsigned &OI) {
171 uint8_t Opcode = Opcodes[OI++ ^ 3];
172 SW.startLine() << format("0x%02X ", Opcode);
173
174 SmallVector<uint8_t, 4> ULEB;
175 do { ULEB.push_back(Opcodes[OI ^ 3]); } while (Opcodes[OI++ ^ 3] & 0x80);
176
177 for (unsigned BI = 0, BE = ULEB.size(); BI != BE; ++BI)
178 OS << format("0x%02X ", ULEB[BI]);
179
180 uint64_t Value = 0;
181 for (unsigned BI = 0, BE = ULEB.size(); BI != BE; ++BI)
182 Value = Value | ((ULEB[BI] & 0x7f) << (7 * BI));
183
184 OS << format("; vsp = vsp + %" PRIu64 "\n", 0x204 + (Value << 2));
185 }
186 inline void OpcodeDecoder::Decode_10110011_sssscccc(const uint8_t *Opcodes,
187 unsigned &OI) {
188 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
189 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
190 SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
191 uint8_t Start = ((Opcode1 & 0xf0) >> 4);
192 uint8_t Count = ((Opcode1 & 0x0f) >> 0);
193 PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
194 OS << '\n';
195 }
196 inline void OpcodeDecoder::Decode_101101nn(const uint8_t *Opcodes,
197 unsigned &OI) {
198 uint8_t Opcode = Opcodes[OI++ ^ 3];
199 SW.startLine() << format("0x%02X ; spare\n", Opcode);
200 }
201 inline void OpcodeDecoder::Decode_10111nnn(const uint8_t *Opcodes,
202 unsigned &OI) {
203 uint8_t Opcode = Opcodes[OI++ ^ 3];
204 SW.startLine() << format("0x%02X ; pop ", Opcode);
205 PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 8), "d");
206 OS << '\n';
207 }
208 inline void OpcodeDecoder::Decode_11000110_sssscccc(const uint8_t *Opcodes,
209 unsigned &OI) {
210 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
211 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
212 SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
213 uint8_t Start = ((Opcode1 & 0xf0) >> 4);
214 uint8_t Count = ((Opcode1 & 0x0f) >> 0);
215 PrintRegisters((((1 << (Count + 1)) - 1) << Start), "wR");
216 OS << '\n';
217 }
218 inline void OpcodeDecoder::Decode_11000111_0000iiii(const uint8_t *Opcodes,
219 unsigned &OI) {
220 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
221 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
222 SW.startLine()
223 << format("0x%02X 0x%02X ; %s", Opcode0, Opcode1,
224 ((Opcode1 & 0xf0) || Opcode1 == 0x00) ? "spare" : "pop ");
225 if ((Opcode1 & 0xf0) == 0x00 && Opcode1)
226 PrintRegisters(Opcode1 & 0x0f, "wCGR");
227 OS << '\n';
228 }
229 inline void OpcodeDecoder::Decode_11001000_sssscccc(const uint8_t *Opcodes,
230 unsigned &OI) {
231 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
232 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
233 SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
234 uint8_t Start = 16 + ((Opcode1 & 0xf0) >> 4);
235 uint8_t Count = ((Opcode1 & 0x0f) >> 0);
236 PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
237 OS << '\n';
238 }
239 inline void OpcodeDecoder::Decode_11001001_sssscccc(const uint8_t *Opcodes,
240 unsigned &OI) {
241 uint8_t Opcode0 = Opcodes[OI++ ^ 3];
242 uint8_t Opcode1 = Opcodes[OI++ ^ 3];
243 SW.startLine() << format("0x%02X 0x%02X ; pop ", Opcode0, Opcode1);
244 uint8_t Start = ((Opcode1 & 0xf0) >> 4);
245 uint8_t Count = ((Opcode1 & 0x0f) >> 0);
246 PrintRegisters((((1 << (Count + 1)) - 1) << Start), "d");
247 OS << '\n';
248 }
249 inline void OpcodeDecoder::Decode_11001yyy(const uint8_t *Opcodes,
250 unsigned &OI) {
251 uint8_t Opcode = Opcodes[OI++ ^ 3];
252 SW.startLine() << format("0x%02X ; spare\n", Opcode);
253 }
254 inline void OpcodeDecoder::Decode_11000nnn(const uint8_t *Opcodes,
255 unsigned &OI) {
256 uint8_t Opcode = Opcodes[OI++ ^ 3];
257 SW.startLine() << format("0x%02X ; pop ", Opcode);
258 PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 10), "wR");
259 OS << '\n';
260 }
261 inline void OpcodeDecoder::Decode_11010nnn(const uint8_t *Opcodes,
262 unsigned &OI) {
263 uint8_t Opcode = Opcodes[OI++ ^ 3];
264 SW.startLine() << format("0x%02X ; pop ", Opcode);
265 PrintRegisters((((1 << ((Opcode & 0x07) + 1)) - 1) << 8), "d");
266 OS << '\n';
267 }
268 inline void OpcodeDecoder::Decode_11xxxyyy(const uint8_t *Opcodes,
269 unsigned &OI) {
270 uint8_t Opcode = Opcodes[OI++ ^ 3];
271 SW.startLine() << format("0x%02X ; spare\n", Opcode);
272 }
273
274 inline void OpcodeDecoder::PrintGPR(uint16_t GPRMask) {
275 static const char *GPRRegisterNames[16] = {
276 "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10",
277 "fp", "ip", "sp", "lr", "pc"
278 };
279
280 OS << '{';
281 bool Comma = false;
282 for (unsigned RI = 0, RE = 17; RI < RE; ++RI) {
283 if (GPRMask & (1 << RI)) {
284 if (Comma)
285 OS << ", ";
286 OS << GPRRegisterNames[RI];
287 Comma = true;
288 }
289 }
290 OS << '}';
291 }
292
293 inline void OpcodeDecoder::PrintRegisters(uint32_t VFPMask, StringRef Prefix) {
294 OS << '{';
295 bool Comma = false;
296 for (unsigned RI = 0, RE = 32; RI < RE; ++RI) {
297 if (VFPMask & (1 << RI)) {
298 if (Comma)
299 OS << ", ";
300 OS << Prefix << RI;
301 Comma = true;
302 }
303 }
304 OS << '}';
305 }
306
307 inline void OpcodeDecoder::Decode(const uint8_t *Opcodes, off_t Offset,
308 size_t Length) {
309 for (unsigned OCI = Offset; OCI < Length + Offset; ) {
310 bool Decoded = false;
311 for (const auto &RE : ring()) {
312 if ((Opcodes[OCI ^ 3] & RE.Mask) == RE.Value) {
313 (this->*RE.Routine)(Opcodes, OCI);
314 Decoded = true;
315 break;
316 }
317 }
318 if (!Decoded)
319 SW.startLine() << format("0x%02X ; reserved\n", Opcodes[OCI++ ^ 3]);
320 }
321 }
322
323 template <typename ET>
324 class PrinterContext {
325 typedef typename ET::Sym Elf_Sym;
326 typedef typename ET::Shdr Elf_Shdr;
327 typedef typename ET::Rel Elf_Rel;
328 typedef typename ET::Word Elf_Word;
329
330 ScopedPrinter &SW;
331 const object::ELFFile<ET> *ELF;
332 StringRef FileName;
333 const Elf_Shdr *Symtab;
334 ArrayRef<Elf_Word> ShndxTable;
335
336 static const size_t IndexTableEntrySize;
337
338 static uint64_t PREL31(uint32_t Address, uint32_t Place) {
339 uint64_t Location = Address & 0x7fffffff;
340 if (Location & 0x04000000)
341 Location |= (uint64_t) ~0x7fffffff;
342 return Location + Place;
343 }
344
345 ErrorOr<StringRef> FunctionAtAddress(unsigned Section, uint64_t Address) const;
346 const Elf_Shdr *FindExceptionTable(unsigned IndexTableIndex,
347 off_t IndexTableOffset) const;
348
349 void PrintIndexTable(unsigned SectionIndex, const Elf_Shdr *IT) const;
350 void PrintExceptionTable(const Elf_Shdr *IT, const Elf_Shdr *EHT,
351 uint64_t TableEntryOffset) const;
352 void PrintOpcodes(const uint8_t *Entry, size_t Length, off_t Offset) const;
353
354 public:
355 PrinterContext(ScopedPrinter &SW, const object::ELFFile<ET> *ELF,
356 StringRef FileName, const Elf_Shdr *Symtab)
357 : SW(SW), ELF(ELF), FileName(FileName), Symtab(Symtab) {}
358
359 void PrintUnwindInformation() const;
360 };
361
362 template <typename ET>
363 const size_t PrinterContext<ET>::IndexTableEntrySize = 8;
364
365 template <typename ET>
366 ErrorOr<StringRef>
367 PrinterContext<ET>::FunctionAtAddress(unsigned Section,
368 uint64_t Address) const {
369 if (!Symtab)
370 return readobj_error::unknown_symbol;
371 auto StrTableOrErr = ELF->getStringTableForSymtab(*Symtab);
372 if (!StrTableOrErr)
373 reportError(StrTableOrErr.takeError(), FileName);
374 StringRef StrTable = *StrTableOrErr;
375
376 for (const Elf_Sym &Sym : unwrapOrError(FileName, ELF->symbols(Symtab)))
377 if (Sym.st_shndx == Section && Sym.st_value == Address &&
378 Sym.getType() == ELF::STT_FUNC) {
379 auto NameOrErr = Sym.getName(StrTable);
380 if (!NameOrErr) {
381 // TODO: Actually report errors helpfully.
382 consumeError(NameOrErr.takeError());
383 return readobj_error::unknown_symbol;
384 }
385 return *NameOrErr;
386 }
387 return readobj_error::unknown_symbol;
388 }
389
390 template <typename ET>
391 const typename ET::Shdr *
392 PrinterContext<ET>::FindExceptionTable(unsigned IndexSectionIndex,
393 off_t IndexTableOffset) const {
394 /// Iterate through the sections, searching for the relocation section
395 /// associated with the unwind index table section specified by
396 /// IndexSectionIndex. Iterate the associated section searching for the
397 /// relocation associated with the index table entry specified by
398 /// IndexTableOffset. The symbol is the section symbol for the exception
399 /// handling table. Use this symbol to recover the actual exception handling
400 /// table.
401
402 for (const Elf_Shdr &Sec : unwrapOrError(FileName, ELF->sections())) {
403 if (Sec.sh_type != ELF::SHT_REL || Sec.sh_info != IndexSectionIndex)
404 continue;
405
406 auto SymTabOrErr = ELF->getSection(Sec.sh_link);
407 if (!SymTabOrErr)
408 reportError(SymTabOrErr.takeError(), FileName);
409 const Elf_Shdr *SymTab = *SymTabOrErr;
410
411 for (const Elf_Rel &R : unwrapOrError(FileName, ELF->rels(&Sec))) {
412 if (R.r_offset != static_cast<unsigned>(IndexTableOffset))
413 continue;
414
415 typename ET::Rela RelA;
416 RelA.r_offset = R.r_offset;
417 RelA.r_info = R.r_info;
418 RelA.r_addend = 0;
419
420 const Elf_Sym *Symbol =
421 unwrapOrError(FileName, ELF->getRelocationSymbol(&RelA, SymTab));
422
423 auto Ret = ELF->getSection(Symbol, SymTab, ShndxTable);
424 if (!Ret)
425 report_fatal_error(errorToErrorCode(Ret.takeError()).message());
426 return *Ret;
427 }
428 }
429 return nullptr;
430 }
431
432 template <typename ET>
433 void PrinterContext<ET>::PrintExceptionTable(const Elf_Shdr *IT,
434 const Elf_Shdr *EHT,
435 uint64_t TableEntryOffset) const {
436 Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(EHT);
437 if (!Contents)
438 return;
439
440 /// ARM EHABI Section 6.2 - The generic model
441 ///
442 /// An exception-handling table entry for the generic model is laid out as:
443 ///
444 /// 3 3
445 /// 1 0 0
446 /// +-+------------------------------+
447 /// |0| personality routine offset |
448 /// +-+------------------------------+
449 /// | personality routine data ... |
450 ///
451 ///
452 /// ARM EHABI Section 6.3 - The ARM-defined compact model
453 ///
454 /// An exception-handling table entry for the compact model looks like:
455 ///
456 /// 3 3 2 2 2 2
457 /// 1 0 8 7 4 3 0
458 /// +-+---+----+-----------------------+
459 /// |1| 0 | Ix | data for pers routine |
460 /// +-+---+----+-----------------------+
461 /// | more personality routine data |
462
463 const support::ulittle32_t Word =
464 *reinterpret_cast<const support::ulittle32_t *>(Contents->data() + TableEntryOffset);
465
466 if (Word & 0x80000000) {
467 SW.printString("Model", StringRef("Compact"));
468
469 unsigned PersonalityIndex = (Word & 0x0f000000) >> 24;
470 SW.printNumber("PersonalityIndex", PersonalityIndex);
471
472 switch (PersonalityIndex) {
473 case AEABI_UNWIND_CPP_PR0:
474 PrintOpcodes(Contents->data() + TableEntryOffset, 3, 1);
475 break;
476 case AEABI_UNWIND_CPP_PR1:
477 case AEABI_UNWIND_CPP_PR2:
478 unsigned AdditionalWords = (Word & 0x00ff0000) >> 16;
479 PrintOpcodes(Contents->data() + TableEntryOffset, 2 + 4 * AdditionalWords,
480 2);
481 break;
482 }
483 } else {
484 SW.printString("Model", StringRef("Generic"));
485
486 uint64_t Address = PREL31(Word, EHT->sh_addr);
487 SW.printHex("PersonalityRoutineAddress", Address);
488 if (ErrorOr<StringRef> Name = FunctionAtAddress(EHT->sh_link, Address))
489 SW.printString("PersonalityRoutineName", *Name);
490 }
491 }
492
493 template <typename ET>
494 void PrinterContext<ET>::PrintOpcodes(const uint8_t *Entry,
495 size_t Length, off_t Offset) const {
496 ListScope OCC(SW, "Opcodes");
497 OpcodeDecoder(OCC.W).Decode(Entry, Offset, Length);
498 }
499
500 template <typename ET>
501 void PrinterContext<ET>::PrintIndexTable(unsigned SectionIndex,
502 const Elf_Shdr *IT) const {
503 Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(IT);
504 if (!Contents)
505 return;
506
507 /// ARM EHABI Section 5 - Index Table Entries
508 /// * The first word contains a PREL31 offset to the start of a function with
509 /// bit 31 clear
510 /// * The second word contains one of:
511 /// - The PREL31 offset of the start of the table entry for the function,
512 /// with bit 31 clear
513 /// - The exception-handling table entry itself with bit 31 set
514 /// - The special bit pattern EXIDX_CANTUNWIND, indicating that associated
515 /// frames cannot be unwound
516
517 const support::ulittle32_t *Data =
518 reinterpret_cast<const support::ulittle32_t *>(Contents->data());
519 const unsigned Entries = IT->sh_size / IndexTableEntrySize;
520
521 ListScope E(SW, "Entries");
522 for (unsigned Entry = 0; Entry < Entries; ++Entry) {
523 DictScope E(SW, "Entry");
524
525 const support::ulittle32_t Word0 =
526 Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 0];
527 const support::ulittle32_t Word1 =
528 Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 1];
529
530 if (Word0 & 0x80000000) {
531 errs() << "corrupt unwind data in section " << SectionIndex << "\n";
532 continue;
533 }
534
535 const uint64_t Offset = PREL31(Word0, IT->sh_addr);
536 SW.printHex("FunctionAddress", Offset);
537 if (ErrorOr<StringRef> Name = FunctionAtAddress(IT->sh_link, Offset))
538 SW.printString("FunctionName", *Name);
539
540 if (Word1 == EXIDX_CANTUNWIND) {
541 SW.printString("Model", StringRef("CantUnwind"));
542 continue;
543 }
544
545 if (Word1 & 0x80000000) {
546 SW.printString("Model", StringRef("Compact (Inline)"));
547
548 unsigned PersonalityIndex = (Word1 & 0x0f000000) >> 24;
549 SW.printNumber("PersonalityIndex", PersonalityIndex);
550
551 PrintOpcodes(Contents->data() + Entry * IndexTableEntrySize + 4, 3, 1);
552 } else {
553 const Elf_Shdr *EHT =
554 FindExceptionTable(SectionIndex, Entry * IndexTableEntrySize + 4);
555
556 if (EHT)
557 if (auto Name = ELF->getSectionName(EHT))
558 SW.printString("ExceptionHandlingTable", *Name);
559
560 uint64_t TableEntryOffset = PREL31(Word1, IT->sh_addr);
561 SW.printHex("TableEntryOffset", TableEntryOffset);
562
563 if (EHT)
564 PrintExceptionTable(IT, EHT, TableEntryOffset);
565 }
566 }
567 }
568
569 template <typename ET>
570 void PrinterContext<ET>::PrintUnwindInformation() const {
571 DictScope UI(SW, "UnwindInformation");
572
573 int SectionIndex = 0;
574 for (const Elf_Shdr &Sec : unwrapOrError(FileName, ELF->sections())) {
575 if (Sec.sh_type == ELF::SHT_ARM_EXIDX) {
576 DictScope UIT(SW, "UnwindIndexTable");
577
578 SW.printNumber("SectionIndex", SectionIndex);
579 if (auto SectionName = ELF->getSectionName(&Sec))
580 SW.printString("SectionName", *SectionName);
581 SW.printHex("SectionOffset", Sec.sh_offset);
582
583 PrintIndexTable(SectionIndex, &Sec);
584 }
585 ++SectionIndex;
586 }
587 }
588 }
589 }
590 }
591
592 #endif
The LLVM Project is a collection of modular and reusable compiler and toolchain technologies.