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[DAGCombiner] Eliminate dead stores to stack.
[llvm-complete.git] / tools / llvm-readobj / ARMEHABIPrinter.h
blobf847041a6ae6f42a8460eab46519ad7dbf936eec
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 const Elf_Shdr *Symtab;
333 ArrayRef<Elf_Word> ShndxTable;
334
335 static const size_t IndexTableEntrySize;
336
337 static uint64_t PREL31(uint32_t Address, uint32_t Place) {
338 uint64_t Location = Address & 0x7fffffff;
339 if (Location & 0x04000000)
340 Location |= (uint64_t) ~0x7fffffff;
341 return Location + Place;
342 }
343
344 ErrorOr<StringRef> FunctionAtAddress(unsigned Section, uint64_t Address) const;
345 const Elf_Shdr *FindExceptionTable(unsigned IndexTableIndex,
346 off_t IndexTableOffset) const;
347
348 void PrintIndexTable(unsigned SectionIndex, const Elf_Shdr *IT) const;
349 void PrintExceptionTable(const Elf_Shdr *IT, const Elf_Shdr *EHT,
350 uint64_t TableEntryOffset) const;
351 void PrintOpcodes(const uint8_t *Entry, size_t Length, off_t Offset) const;
352
353 public:
354 PrinterContext(ScopedPrinter &SW, const object::ELFFile<ET> *ELF,
355 const Elf_Shdr *Symtab)
356 : SW(SW), ELF(ELF), Symtab(Symtab) {}
357
358 void PrintUnwindInformation() const;
359 };
360
361 template <typename ET>
362 const size_t PrinterContext<ET>::IndexTableEntrySize = 8;
363
364 template <typename ET>
365 ErrorOr<StringRef>
366 PrinterContext<ET>::FunctionAtAddress(unsigned Section,
367 uint64_t Address) const {
368 auto StrTableOrErr = ELF->getStringTableForSymtab(*Symtab);
369 if (!StrTableOrErr)
370 error(StrTableOrErr.takeError());
371 StringRef StrTable = *StrTableOrErr;
372
373 for (const Elf_Sym &Sym : unwrapOrError(ELF->symbols(Symtab)))
374 if (Sym.st_shndx == Section && Sym.st_value == Address &&
375 Sym.getType() == ELF::STT_FUNC) {
376 auto NameOrErr = Sym.getName(StrTable);
377 if (!NameOrErr) {
378 // TODO: Actually report errors helpfully.
379 consumeError(NameOrErr.takeError());
380 return readobj_error::unknown_symbol;
381 }
382 return *NameOrErr;
383 }
384 return readobj_error::unknown_symbol;
385 }
386
387 template <typename ET>
388 const typename ET::Shdr *
389 PrinterContext<ET>::FindExceptionTable(unsigned IndexSectionIndex,
390 off_t IndexTableOffset) const {
391 /// Iterate through the sections, searching for the relocation section
392 /// associated with the unwind index table section specified by
393 /// IndexSectionIndex. Iterate the associated section searching for the
394 /// relocation associated with the index table entry specified by
395 /// IndexTableOffset. The symbol is the section symbol for the exception
396 /// handling table. Use this symbol to recover the actual exception handling
397 /// table.
398
399 for (const Elf_Shdr &Sec : unwrapOrError(ELF->sections())) {
400 if (Sec.sh_type != ELF::SHT_REL || Sec.sh_info != IndexSectionIndex)
401 continue;
402
403 auto SymTabOrErr = ELF->getSection(Sec.sh_link);
404 if (!SymTabOrErr)
405 error(SymTabOrErr.takeError());
406 const Elf_Shdr *SymTab = *SymTabOrErr;
407
408 for (const Elf_Rel &R : unwrapOrError(ELF->rels(&Sec))) {
409 if (R.r_offset != static_cast<unsigned>(IndexTableOffset))
410 continue;
411
412 typename ET::Rela RelA;
413 RelA.r_offset = R.r_offset;
414 RelA.r_info = R.r_info;
415 RelA.r_addend = 0;
416
417 const Elf_Sym *Symbol =
418 unwrapOrError(ELF->getRelocationSymbol(&RelA, SymTab));
419
420 auto Ret = ELF->getSection(Symbol, SymTab, ShndxTable);
421 if (!Ret)
422 report_fatal_error(errorToErrorCode(Ret.takeError()).message());
423 return *Ret;
424 }
425 }
426 return nullptr;
427 }
428
429 template <typename ET>
430 void PrinterContext<ET>::PrintExceptionTable(const Elf_Shdr *IT,
431 const Elf_Shdr *EHT,
432 uint64_t TableEntryOffset) const {
433 Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(EHT);
434 if (!Contents)
435 return;
436
437 /// ARM EHABI Section 6.2 - The generic model
438 ///
439 /// An exception-handling table entry for the generic model is laid out as:
440 ///
441 /// 3 3
442 /// 1 0 0
443 /// +-+------------------------------+
444 /// |0| personality routine offset |
445 /// +-+------------------------------+
446 /// | personality routine data ... |
447 ///
448 ///
449 /// ARM EHABI Section 6.3 - The ARM-defined compact model
450 ///
451 /// An exception-handling table entry for the compact model looks like:
452 ///
453 /// 3 3 2 2 2 2
454 /// 1 0 8 7 4 3 0
455 /// +-+---+----+-----------------------+
456 /// |1| 0 | Ix | data for pers routine |
457 /// +-+---+----+-----------------------+
458 /// | more personality routine data |
459
460 const support::ulittle32_t Word =
461 *reinterpret_cast<const support::ulittle32_t *>(Contents->data() + TableEntryOffset);
462
463 if (Word & 0x80000000) {
464 SW.printString("Model", StringRef("Compact"));
465
466 unsigned PersonalityIndex = (Word & 0x0f000000) >> 24;
467 SW.printNumber("PersonalityIndex", PersonalityIndex);
468
469 switch (PersonalityIndex) {
470 case AEABI_UNWIND_CPP_PR0:
471 PrintOpcodes(Contents->data() + TableEntryOffset, 3, 1);
472 break;
473 case AEABI_UNWIND_CPP_PR1:
474 case AEABI_UNWIND_CPP_PR2:
475 unsigned AdditionalWords = (Word & 0x00ff0000) >> 16;
476 PrintOpcodes(Contents->data() + TableEntryOffset, 2 + 4 * AdditionalWords,
477 2);
478 break;
479 }
480 } else {
481 SW.printString("Model", StringRef("Generic"));
482
483 uint64_t Address = PREL31(Word, EHT->sh_addr);
484 SW.printHex("PersonalityRoutineAddress", Address);
485 if (ErrorOr<StringRef> Name = FunctionAtAddress(EHT->sh_link, Address))
486 SW.printString("PersonalityRoutineName", *Name);
487 }
488 }
489
490 template <typename ET>
491 void PrinterContext<ET>::PrintOpcodes(const uint8_t *Entry,
492 size_t Length, off_t Offset) const {
493 ListScope OCC(SW, "Opcodes");
494 OpcodeDecoder(OCC.W).Decode(Entry, Offset, Length);
495 }
496
497 template <typename ET>
498 void PrinterContext<ET>::PrintIndexTable(unsigned SectionIndex,
499 const Elf_Shdr *IT) const {
500 Expected<ArrayRef<uint8_t>> Contents = ELF->getSectionContents(IT);
501 if (!Contents)
502 return;
503
504 /// ARM EHABI Section 5 - Index Table Entries
505 /// * The first word contains a PREL31 offset to the start of a function with
506 /// bit 31 clear
507 /// * The second word contains one of:
508 /// - The PREL31 offset of the start of the table entry for the function,
509 /// with bit 31 clear
510 /// - The exception-handling table entry itself with bit 31 set
511 /// - The special bit pattern EXIDX_CANTUNWIND, indicating that associated
512 /// frames cannot be unwound
513
514 const support::ulittle32_t *Data =
515 reinterpret_cast<const support::ulittle32_t *>(Contents->data());
516 const unsigned Entries = IT->sh_size / IndexTableEntrySize;
517
518 ListScope E(SW, "Entries");
519 for (unsigned Entry = 0; Entry < Entries; ++Entry) {
520 DictScope E(SW, "Entry");
521
522 const support::ulittle32_t Word0 =
523 Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 0];
524 const support::ulittle32_t Word1 =
525 Data[Entry * (IndexTableEntrySize / sizeof(*Data)) + 1];
526
527 if (Word0 & 0x80000000) {
528 errs() << "corrupt unwind data in section " << SectionIndex << "\n";
529 continue;
530 }
531
532 const uint64_t Offset = PREL31(Word0, IT->sh_addr);
533 SW.printHex("FunctionAddress", Offset);
534 if (ErrorOr<StringRef> Name = FunctionAtAddress(IT->sh_link, Offset))
535 SW.printString("FunctionName", *Name);
536
537 if (Word1 == EXIDX_CANTUNWIND) {
538 SW.printString("Model", StringRef("CantUnwind"));
539 continue;
540 }
541
542 if (Word1 & 0x80000000) {
543 SW.printString("Model", StringRef("Compact (Inline)"));
544
545 unsigned PersonalityIndex = (Word1 & 0x0f000000) >> 24;
546 SW.printNumber("PersonalityIndex", PersonalityIndex);
547
548 PrintOpcodes(Contents->data() + Entry * IndexTableEntrySize + 4, 3, 1);
549 } else {
550 const Elf_Shdr *EHT =
551 FindExceptionTable(SectionIndex, Entry * IndexTableEntrySize + 4);
552
553 if (auto Name = ELF->getSectionName(EHT))
554 SW.printString("ExceptionHandlingTable", *Name);
555
556 uint64_t TableEntryOffset = PREL31(Word1, IT->sh_addr);
557 SW.printHex("TableEntryOffset", TableEntryOffset);
558
559 PrintExceptionTable(IT, EHT, TableEntryOffset);
560 }
561 }
562 }
563
564 template <typename ET>
565 void PrinterContext<ET>::PrintUnwindInformation() const {
566 DictScope UI(SW, "UnwindInformation");
567
568 int SectionIndex = 0;
569 for (const Elf_Shdr &Sec : unwrapOrError(ELF->sections())) {
570 if (Sec.sh_type == ELF::SHT_ARM_EXIDX) {
571 DictScope UIT(SW, "UnwindIndexTable");
572
573 SW.printNumber("SectionIndex", SectionIndex);
574 if (auto SectionName = ELF->getSectionName(&Sec))
575 SW.printString("SectionName", *SectionName);
576 SW.printHex("SectionOffset", Sec.sh_offset);
577
578 PrintIndexTable(SectionIndex, &Sec);
579 }
580 ++SectionIndex;
581 }
582 }
583 }
584 }
585 }
586
587 #endif
The low level virtual machine