1 //===------------------------- UnwindCursor.hpp ---------------------------===//
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 // C++ interface to lower levels of libunwind
9 //===----------------------------------------------------------------------===//
10
11 #ifndef __UNWINDCURSOR_HPP__
12 #define __UNWINDCURSOR_HPP__
13
14 #include <stdint.h>
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <unwind.h>
18
19 #ifdef _WIN32
20 #include <windows.h>
21 #include <ntverp.h>
22 #endif
23 #ifdef __APPLE__
24 #include <mach-o/dyld.h>
25 #endif
26
27 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
28 // Provide a definition for the DISPATCHER_CONTEXT struct for old (Win7 and
29 // earlier) SDKs.
30 // MinGW-w64 has always provided this struct.
31 #if defined(_WIN32) && defined(_LIBUNWIND_TARGET_X86_64) && \
32 !defined(__MINGW32__) && VER_PRODUCTBUILD < 8000
33 struct _DISPATCHER_CONTEXT {
34 ULONG64 ControlPc;
35 ULONG64 ImageBase;
36 PRUNTIME_FUNCTION FunctionEntry;
37 ULONG64 EstablisherFrame;
38 ULONG64 TargetIp;
39 PCONTEXT ContextRecord;
40 PEXCEPTION_ROUTINE LanguageHandler;
41 PVOID HandlerData;
42 PUNWIND_HISTORY_TABLE HistoryTable;
43 ULONG ScopeIndex;
44 ULONG Fill0;
45 };
46 #endif
47
48 struct UNWIND_INFO {
49 uint8_t Version : 3;
50 uint8_t Flags : 5;
51 uint8_t SizeOfProlog;
52 uint8_t CountOfCodes;
53 uint8_t FrameRegister : 4;
54 uint8_t FrameOffset : 4;
55 uint16_t UnwindCodes[2];
56 };
57
58 extern "C" _Unwind_Reason_Code __libunwind_seh_personality(
59 int, _Unwind_Action, uint64_t, _Unwind_Exception *,
60 struct _Unwind_Context *);
61
62 #endif
63
64 #include "config.h"
65
66 #include "AddressSpace.hpp"
67 #include "CompactUnwinder.hpp"
68 #include "config.h"
69 #include "DwarfInstructions.hpp"
70 #include "EHHeaderParser.hpp"
71 #include "libunwind.h"
72 #include "Registers.hpp"
73 #include "RWMutex.hpp"
74 #include "Unwind-EHABI.h"
75
76 namespace libunwind {
77
78 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
79 /// Cache of recently found FDEs.
80 template <typename A>
81 class _LIBUNWIND_HIDDEN DwarfFDECache {
82 typedef typename A::pint_t pint_t;
83 typedef typename A::pc_t pc_t;
84 typedef typename A::addr_t addr_t;
85
86 public:
87 static pint_t findFDE(pint_t mh, addr_t pc);
88 static void add(pint_t mh, addr_t ip_start, addr_t ip_end, pint_t fde);
89 static void removeAllIn(pint_t mh);
90 static void iterateCacheEntries(void (*func)(unw_word_t ip_start,
91 unw_word_t ip_end,
92 unw_word_t fde, unw_word_t mh));
93
94 private:
95
96 struct entry {
97 pint_t mh;
98 addr_t ip_start;
99 addr_t ip_end;
100 pint_t fde;
101 };
102
103 // These fields are all static to avoid needing an initializer.
104 // There is only one instance of this class per process.
105 static RWMutex _lock;
106 #ifdef __APPLE__
107 static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide);
108 static bool _registeredForDyldUnloads;
109 #endif
110 static entry *_buffer;
111 static entry *_bufferUsed;
112 static entry *_bufferEnd;
113 static entry _initialBuffer[64];
114 };
115
116 template <typename A>
117 typename DwarfFDECache<A>::entry *
118 DwarfFDECache<A>::_buffer = _initialBuffer;
119
120 template <typename A>
121 typename DwarfFDECache<A>::entry *
122 DwarfFDECache<A>::_bufferUsed = _initialBuffer;
123
124 template <typename A>
125 typename DwarfFDECache<A>::entry *
126 DwarfFDECache<A>::_bufferEnd = &_initialBuffer[64];
127
128 template <typename A>
129 typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64];
130
131 template <typename A>
132 RWMutex DwarfFDECache<A>::_lock;
133
134 #ifdef __APPLE__
135 template <typename A>
136 bool DwarfFDECache<A>::_registeredForDyldUnloads = false;
137 #endif
138
139 template <typename A>
findFDE(pint_t mh,addr_t pc)140 typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, addr_t pc) {
141 pint_t result = 0;
142 _LIBUNWIND_LOG_IF_FALSE(_lock.lock_shared());
143 for (entry *p = _buffer; p < _bufferUsed; ++p) {
144 if ((mh == p->mh) || (mh == 0)) {
145 if ((p->ip_start <= pc) && (pc < p->ip_end)) {
146 result = p->fde;
147 break;
148 }
149 }
150 }
151 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock_shared());
152 return result;
153 }
154
155 template <typename A>
add(pint_t mh,addr_t ip_start,addr_t ip_end,pint_t fde)156 void DwarfFDECache<A>::add(pint_t mh, addr_t ip_start, addr_t ip_end,
157 pint_t fde) {
158 #if !defined(_LIBUNWIND_NO_HEAP)
159 _LIBUNWIND_LOG_IF_FALSE(_lock.lock());
160 if (_bufferUsed >= _bufferEnd) {
161 size_t oldSize = (size_t)(_bufferEnd - _buffer);
162 size_t newSize = oldSize * 4;
163 // Can't use operator new (we are below it).
164 entry *newBuffer = (entry *)malloc(newSize * sizeof(entry));
165 memcpy(newBuffer, _buffer, oldSize * sizeof(entry));
166 if (_buffer != _initialBuffer)
167 free(_buffer);
168 _buffer = newBuffer;
169 _bufferUsed = &newBuffer[oldSize];
170 _bufferEnd = &newBuffer[newSize];
171 }
172 _bufferUsed->mh = assert_pointer_in_bounds(mh);
173 _bufferUsed->ip_start = ip_start;
174 _bufferUsed->ip_end = ip_end;
175 assert(ip_start < ip_end);
176 _bufferUsed->fde = assert_pointer_in_bounds(fde);
177 ++_bufferUsed;
178 #ifdef __APPLE__
179 if (!_registeredForDyldUnloads) {
180 _dyld_register_func_for_remove_image(&dyldUnloadHook);
181 _registeredForDyldUnloads = true;
182 }
183 #endif
184 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
185 #endif
186 }
187
188 template <typename A>
removeAllIn(pint_t mh)189 void DwarfFDECache<A>::removeAllIn(pint_t mh) {
190 _LIBUNWIND_LOG_IF_FALSE(_lock.lock());
191 entry *d = _buffer;
192 for (const entry *s = _buffer; s < _bufferUsed; ++s) {
193 if (s->mh != mh) {
194 if (d != s)
195 *d = *s;
196 ++d;
197 }
198 }
199 _bufferUsed = d;
200 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
201 }
202
203 #ifdef __APPLE__
204 template <typename A>
dyldUnloadHook(const struct mach_header * mh,intptr_t)205 void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) {
206 removeAllIn((pint_t) mh);
207 }
208 #endif
209
210 template <typename A>
iterateCacheEntries(void (* func)(unw_word_t ip_start,unw_word_t ip_end,unw_word_t fde,unw_word_t mh))211 void DwarfFDECache<A>::iterateCacheEntries(void (*func)(
212 unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
213 _LIBUNWIND_LOG_IF_FALSE(_lock.lock());
214 for (entry *p = _buffer; p < _bufferUsed; ++p) {
215 (*func)(p->ip_start, p->ip_end, p->fde, p->mh);
216 }
217 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock());
218 }
219 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
220
221
222 #define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
223
224 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
225 template <typename A> class UnwindSectionHeader {
226 public:
UnwindSectionHeader(A & addressSpace,typename A::pint_t addr)227 UnwindSectionHeader(A &addressSpace, typename A::pint_t addr)
228 : _addressSpace(addressSpace), _addr(addr) {}
229
version() const230 uint32_t version() const {
231 return _addressSpace.get32(_addr +
232 offsetof(unwind_info_section_header, version));
233 }
commonEncodingsArraySectionOffset() const234 uint32_t commonEncodingsArraySectionOffset() const {
235 return _addressSpace.get32(_addr +
236 offsetof(unwind_info_section_header,
237 commonEncodingsArraySectionOffset));
238 }
commonEncodingsArrayCount() const239 uint32_t commonEncodingsArrayCount() const {
240 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
241 commonEncodingsArrayCount));
242 }
personalityArraySectionOffset() const243 uint32_t personalityArraySectionOffset() const {
244 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
245 personalityArraySectionOffset));
246 }
personalityArrayCount() const247 uint32_t personalityArrayCount() const {
248 return _addressSpace.get32(
249 _addr + offsetof(unwind_info_section_header, personalityArrayCount));
250 }
indexSectionOffset() const251 uint32_t indexSectionOffset() const {
252 return _addressSpace.get32(
253 _addr + offsetof(unwind_info_section_header, indexSectionOffset));
254 }
indexCount() const255 uint32_t indexCount() const {
256 return _addressSpace.get32(
257 _addr + offsetof(unwind_info_section_header, indexCount));
258 }
259
260 private:
261 A &_addressSpace;
262 typename A::pint_t _addr;
263 };
264
265 template <typename A> class UnwindSectionIndexArray {
266 public:
UnwindSectionIndexArray(A & addressSpace,typename A::pint_t addr)267 UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr)
268 : _addressSpace(addressSpace), _addr(addr) {}
269
functionOffset(uint32_t index) const270 uint32_t functionOffset(uint32_t index) const {
271 return _addressSpace.get32(
272 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
273 functionOffset));
274 }
secondLevelPagesSectionOffset(uint32_t index) const275 uint32_t secondLevelPagesSectionOffset(uint32_t index) const {
276 return _addressSpace.get32(
277 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
278 secondLevelPagesSectionOffset));
279 }
lsdaIndexArraySectionOffset(uint32_t index) const280 uint32_t lsdaIndexArraySectionOffset(uint32_t index) const {
281 return _addressSpace.get32(
282 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
283 lsdaIndexArraySectionOffset));
284 }
285
286 private:
287 A &_addressSpace;
288 typename A::pint_t _addr;
289 };
290
291 template <typename A> class UnwindSectionRegularPageHeader {
292 public:
UnwindSectionRegularPageHeader(A & addressSpace,typename A::pint_t addr)293 UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr)
294 : _addressSpace(addressSpace), _addr(addr) {}
295
kind() const296 uint32_t kind() const {
297 return _addressSpace.get32(
298 _addr + offsetof(unwind_info_regular_second_level_page_header, kind));
299 }
entryPageOffset() const300 uint16_t entryPageOffset() const {
301 return _addressSpace.get16(
302 _addr + offsetof(unwind_info_regular_second_level_page_header,
303 entryPageOffset));
304 }
entryCount() const305 uint16_t entryCount() const {
306 return _addressSpace.get16(
307 _addr +
308 offsetof(unwind_info_regular_second_level_page_header, entryCount));
309 }
310
311 private:
312 A &_addressSpace;
313 typename A::pint_t _addr;
314 };
315
316 template <typename A> class UnwindSectionRegularArray {
317 public:
UnwindSectionRegularArray(A & addressSpace,typename A::pint_t addr)318 UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr)
319 : _addressSpace(addressSpace), _addr(addr) {}
320
functionOffset(uint32_t index) const321 uint32_t functionOffset(uint32_t index) const {
322 return _addressSpace.get32(
323 _addr + arrayoffsetof(unwind_info_regular_second_level_entry, index,
324 functionOffset));
325 }
encoding(uint32_t index) const326 uint32_t encoding(uint32_t index) const {
327 return _addressSpace.get32(
328 _addr +
329 arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding));
330 }
331
332 private:
333 A &_addressSpace;
334 typename A::pint_t _addr;
335 };
336
337 template <typename A> class UnwindSectionCompressedPageHeader {
338 public:
UnwindSectionCompressedPageHeader(A & addressSpace,typename A::pint_t addr)339 UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr)
340 : _addressSpace(addressSpace), _addr(addr) {}
341
kind() const342 uint32_t kind() const {
343 return _addressSpace.get32(
344 _addr +
345 offsetof(unwind_info_compressed_second_level_page_header, kind));
346 }
entryPageOffset() const347 uint16_t entryPageOffset() const {
348 return _addressSpace.get16(
349 _addr + offsetof(unwind_info_compressed_second_level_page_header,
350 entryPageOffset));
351 }
entryCount() const352 uint16_t entryCount() const {
353 return _addressSpace.get16(
354 _addr +
355 offsetof(unwind_info_compressed_second_level_page_header, entryCount));
356 }
encodingsPageOffset() const357 uint16_t encodingsPageOffset() const {
358 return _addressSpace.get16(
359 _addr + offsetof(unwind_info_compressed_second_level_page_header,
360 encodingsPageOffset));
361 }
encodingsCount() const362 uint16_t encodingsCount() const {
363 return _addressSpace.get16(
364 _addr + offsetof(unwind_info_compressed_second_level_page_header,
365 encodingsCount));
366 }
367
368 private:
369 A &_addressSpace;
370 typename A::pint_t _addr;
371 };
372
373 template <typename A> class UnwindSectionCompressedArray {
374 public:
UnwindSectionCompressedArray(A & addressSpace,typename A::pint_t addr)375 UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr)
376 : _addressSpace(addressSpace), _addr(addr) {}
377
functionOffset(uint32_t index) const378 uint32_t functionOffset(uint32_t index) const {
379 return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(
380 _addressSpace.get32(_addr + index * sizeof(uint32_t)));
381 }
encodingIndex(uint32_t index) const382 uint16_t encodingIndex(uint32_t index) const {
383 return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(
384 _addressSpace.get32(_addr + index * sizeof(uint32_t)));
385 }
386
387 private:
388 A &_addressSpace;
389 typename A::pint_t _addr;
390 };
391
392 template <typename A> class UnwindSectionLsdaArray {
393 public:
UnwindSectionLsdaArray(A & addressSpace,typename A::pint_t addr)394 UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr)
395 : _addressSpace(addressSpace), _addr(addr) {}
396
functionOffset(uint32_t index) const397 uint32_t functionOffset(uint32_t index) const {
398 return _addressSpace.get32(
399 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
400 index, functionOffset));
401 }
lsdaOffset(uint32_t index) const402 uint32_t lsdaOffset(uint32_t index) const {
403 return _addressSpace.get32(
404 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
405 index, lsdaOffset));
406 }
407
408 private:
409 A &_addressSpace;
410 typename A::pint_t _addr;
411 };
412 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
413
414 class _LIBUNWIND_HIDDEN AbstractUnwindCursor {
415 public:
416 // NOTE: provide a class specific placement deallocation function (S5.3.4 p20)
417 // This avoids an unnecessary dependency to libc++abi.
operator delete(void *,size_t)418 void operator delete(void *, size_t) {}
419
~AbstractUnwindCursor()420 virtual ~AbstractUnwindCursor() {}
validReg(int)421 virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); }
getReg(int)422 virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); }
setReg(int,unw_word_t)423 virtual void setReg(int, unw_word_t) {
424 _LIBUNWIND_ABORT("setReg not implemented");
425 }
validFloatReg(int)426 virtual bool validFloatReg(int) {
427 _LIBUNWIND_ABORT("validFloatReg not implemented");
428 }
getFloatReg(int)429 virtual unw_fpreg_t getFloatReg(int) {
430 _LIBUNWIND_ABORT("getFloatReg not implemented");
431 }
setFloatReg(int,unw_fpreg_t)432 virtual void setFloatReg(int, unw_fpreg_t) {
433 _LIBUNWIND_ABORT("setFloatReg not implemented");
434 }
step()435 virtual int step() { _LIBUNWIND_ABORT("step not implemented"); }
getInfo(unw_proc_info_t *)436 virtual void getInfo(unw_proc_info_t *) {
437 _LIBUNWIND_ABORT("getInfo not implemented");
438 }
jumpto()439 virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); }
isSignalFrame()440 virtual bool isSignalFrame() {
441 _LIBUNWIND_ABORT("isSignalFrame not implemented");
442 }
getFunctionName(char *,size_t,size_t *)443 virtual bool getFunctionName(char *, size_t, size_t *) {
444 _LIBUNWIND_ABORT("getFunctionName not implemented");
445 }
setInfoBasedOnIPRegister(bool=false)446 virtual void setInfoBasedOnIPRegister(bool = false) {
447 _LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented");
448 }
getRegisterName(int)449 virtual const char *getRegisterName(int) {
450 _LIBUNWIND_ABORT("getRegisterName not implemented");
451 }
452 #ifdef __arm__
saveVFPAsX()453 virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); }
454 #endif
455 };
456
457 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32)
458
459 /// \c UnwindCursor contains all state (including all register values) during
460 /// an unwind. This is normally stack-allocated inside a unw_cursor_t.
461 template <typename A, typename R>
462 class UnwindCursor : public AbstractUnwindCursor {
463 typedef typename A::pint_t pint_t;
464 public:
465 UnwindCursor(unw_context_t *context, A &as);
466 UnwindCursor(CONTEXT *context, A &as);
467 UnwindCursor(A &as, void *threadArg);
~UnwindCursor()468 virtual ~UnwindCursor() {}
469 virtual bool validReg(int);
470 virtual unw_word_t getReg(int);
471 virtual void setReg(int, unw_word_t);
472 virtual bool validFloatReg(int);
473 virtual unw_fpreg_t getFloatReg(int);
474 virtual void setFloatReg(int, unw_fpreg_t);
475 virtual int step();
476 virtual void getInfo(unw_proc_info_t *);
477 virtual void jumpto();
478 virtual bool isSignalFrame();
479 virtual bool getFunctionName(char *buf, size_t len, size_t *off);
480 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false);
481 virtual const char *getRegisterName(int num);
482 #ifdef __arm__
483 virtual void saveVFPAsX();
484 #endif
485
getDispatcherContext()486 DISPATCHER_CONTEXT *getDispatcherContext() { return &_dispContext; }
setDispatcherContext(DISPATCHER_CONTEXT * disp)487 void setDispatcherContext(DISPATCHER_CONTEXT *disp) { _dispContext = *disp; }
488
489 // libunwind does not and should not depend on C++ library which means that we
490 // need our own defition of inline placement new.
operator new(size_t,UnwindCursor<A,R> * p)491 static void *operator new(size_t, UnwindCursor<A, R> *p) { return p; }
492
493 private:
494
getLastPC() const495 pint_t getLastPC() const { return _dispContext.ControlPc; }
setLastPC(pint_t pc)496 void setLastPC(pint_t pc) { _dispContext.ControlPc = pc; }
lookUpSEHUnwindInfo(pint_t pc,pint_t * base)497 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) {
498 _dispContext.FunctionEntry = RtlLookupFunctionEntry(pc,
499 &_dispContext.ImageBase,
500 _dispContext.HistoryTable);
501 *base = _dispContext.ImageBase;
502 return _dispContext.FunctionEntry;
503 }
504 bool getInfoFromSEH(pint_t pc);
stepWithSEHData()505 int stepWithSEHData() {
506 _dispContext.LanguageHandler = RtlVirtualUnwind(UNW_FLAG_UHANDLER,
507 _dispContext.ImageBase,
508 _dispContext.ControlPc,
509 _dispContext.FunctionEntry,
510 _dispContext.ContextRecord,
511 &_dispContext.HandlerData,
512 &_dispContext.EstablisherFrame,
513 NULL);
514 // Update some fields of the unwind info now, since we have them.
515 _info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData);
516 if (_dispContext.LanguageHandler) {
517 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
518 } else
519 _info.handler = 0;
520 return UNW_STEP_SUCCESS;
521 }
522
523 A &_addressSpace;
524 unw_proc_info_t _info;
525 DISPATCHER_CONTEXT _dispContext;
526 CONTEXT _msContext;
527 UNWIND_HISTORY_TABLE _histTable;
528 bool _unwindInfoMissing;
529 };
530
531
532 template <typename A, typename R>
UnwindCursor(unw_context_t * context,A & as)533 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as)
534 : _addressSpace(as), _unwindInfoMissing(false) {
535 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
536 "UnwindCursor<> does not fit in unw_cursor_t");
537 memset(&_info, 0, sizeof(_info));
538 memset(&_histTable, 0, sizeof(_histTable));
539 _dispContext.ContextRecord = &_msContext;
540 _dispContext.HistoryTable = &_histTable;
541 // Initialize MS context from ours.
542 R r(context);
543 _msContext.ContextFlags = CONTEXT_CONTROL|CONTEXT_INTEGER|CONTEXT_FLOATING_POINT;
544 #if defined(_LIBUNWIND_TARGET_X86_64)
545 _msContext.Rax = r.getRegister(UNW_X86_64_RAX);
546 _msContext.Rcx = r.getRegister(UNW_X86_64_RCX);
547 _msContext.Rdx = r.getRegister(UNW_X86_64_RDX);
548 _msContext.Rbx = r.getRegister(UNW_X86_64_RBX);
549 _msContext.Rsp = r.getRegister(UNW_X86_64_RSP);
550 _msContext.Rbp = r.getRegister(UNW_X86_64_RBP);
551 _msContext.Rsi = r.getRegister(UNW_X86_64_RSI);
552 _msContext.Rdi = r.getRegister(UNW_X86_64_RDI);
553 _msContext.R8 = r.getRegister(UNW_X86_64_R8);
554 _msContext.R9 = r.getRegister(UNW_X86_64_R9);
555 _msContext.R10 = r.getRegister(UNW_X86_64_R10);
556 _msContext.R11 = r.getRegister(UNW_X86_64_R11);
557 _msContext.R12 = r.getRegister(UNW_X86_64_R12);
558 _msContext.R13 = r.getRegister(UNW_X86_64_R13);
559 _msContext.R14 = r.getRegister(UNW_X86_64_R14);
560 _msContext.R15 = r.getRegister(UNW_X86_64_R15);
561 _msContext.Rip = r.getRegister(UNW_REG_IP);
562 union {
563 v128 v;
564 M128A m;
565 } t;
566 t.v = r.getVectorRegister(UNW_X86_64_XMM0);
567 _msContext.Xmm0 = t.m;
568 t.v = r.getVectorRegister(UNW_X86_64_XMM1);
569 _msContext.Xmm1 = t.m;
570 t.v = r.getVectorRegister(UNW_X86_64_XMM2);
571 _msContext.Xmm2 = t.m;
572 t.v = r.getVectorRegister(UNW_X86_64_XMM3);
573 _msContext.Xmm3 = t.m;
574 t.v = r.getVectorRegister(UNW_X86_64_XMM4);
575 _msContext.Xmm4 = t.m;
576 t.v = r.getVectorRegister(UNW_X86_64_XMM5);
577 _msContext.Xmm5 = t.m;
578 t.v = r.getVectorRegister(UNW_X86_64_XMM6);
579 _msContext.Xmm6 = t.m;
580 t.v = r.getVectorRegister(UNW_X86_64_XMM7);
581 _msContext.Xmm7 = t.m;
582 t.v = r.getVectorRegister(UNW_X86_64_XMM8);
583 _msContext.Xmm8 = t.m;
584 t.v = r.getVectorRegister(UNW_X86_64_XMM9);
585 _msContext.Xmm9 = t.m;
586 t.v = r.getVectorRegister(UNW_X86_64_XMM10);
587 _msContext.Xmm10 = t.m;
588 t.v = r.getVectorRegister(UNW_X86_64_XMM11);
589 _msContext.Xmm11 = t.m;
590 t.v = r.getVectorRegister(UNW_X86_64_XMM12);
591 _msContext.Xmm12 = t.m;
592 t.v = r.getVectorRegister(UNW_X86_64_XMM13);
593 _msContext.Xmm13 = t.m;
594 t.v = r.getVectorRegister(UNW_X86_64_XMM14);
595 _msContext.Xmm14 = t.m;
596 t.v = r.getVectorRegister(UNW_X86_64_XMM15);
597 _msContext.Xmm15 = t.m;
598 #elif defined(_LIBUNWIND_TARGET_ARM)
599 _msContext.R0 = r.getRegister(UNW_ARM_R0);
600 _msContext.R1 = r.getRegister(UNW_ARM_R1);
601 _msContext.R2 = r.getRegister(UNW_ARM_R2);
602 _msContext.R3 = r.getRegister(UNW_ARM_R3);
603 _msContext.R4 = r.getRegister(UNW_ARM_R4);
604 _msContext.R5 = r.getRegister(UNW_ARM_R5);
605 _msContext.R6 = r.getRegister(UNW_ARM_R6);
606 _msContext.R7 = r.getRegister(UNW_ARM_R7);
607 _msContext.R8 = r.getRegister(UNW_ARM_R8);
608 _msContext.R9 = r.getRegister(UNW_ARM_R9);
609 _msContext.R10 = r.getRegister(UNW_ARM_R10);
610 _msContext.R11 = r.getRegister(UNW_ARM_R11);
611 _msContext.R12 = r.getRegister(UNW_ARM_R12);
612 _msContext.Sp = r.getRegister(UNW_ARM_SP);
613 _msContext.Lr = r.getRegister(UNW_ARM_LR);
614 _msContext.Pc = r.getRegister(UNW_ARM_IP);
615 for (int i = UNW_ARM_D0; i <= UNW_ARM_D31; ++i) {
616 union {
617 uint64_t w;
618 double d;
619 } d;
620 d.d = r.getFloatRegister(i);
621 _msContext.D[i - UNW_ARM_D0] = d.w;
622 }
623 #elif defined(_LIBUNWIND_TARGET_AARCH64)
624 for (int i = UNW_ARM64_X0; i <= UNW_ARM64_X30; ++i)
625 _msContext.X[i - UNW_ARM64_X0] = r.getRegister(i);
626 _msContext.Sp = r.getRegister(UNW_REG_SP);
627 _msContext.Pc = r.getRegister(UNW_REG_IP);
628 for (int i = UNW_ARM64_D0; i <= UNW_ARM64_D31; ++i)
629 _msContext.V[i - UNW_ARM64_D0].D[0] = r.getFloatRegister(i);
630 #endif
631 }
632
633 template <typename A, typename R>
UnwindCursor(CONTEXT * context,A & as)634 UnwindCursor<A, R>::UnwindCursor(CONTEXT *context, A &as)
635 : _addressSpace(as), _unwindInfoMissing(false) {
636 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
637 "UnwindCursor<> does not fit in unw_cursor_t");
638 memset(&_info, 0, sizeof(_info));
639 memset(&_histTable, 0, sizeof(_histTable));
640 _dispContext.ContextRecord = &_msContext;
641 _dispContext.HistoryTable = &_histTable;
642 _msContext = *context;
643 }
644
645
646 template <typename A, typename R>
validReg(int regNum)647 bool UnwindCursor<A, R>::validReg(int regNum) {
648 if (regNum == UNW_REG_IP || regNum == UNW_REG_SP) return true;
649 #if defined(_LIBUNWIND_TARGET_X86_64)
650 if (regNum >= UNW_X86_64_RAX && regNum <= UNW_X86_64_R15) return true;
651 #elif defined(_LIBUNWIND_TARGET_ARM)
652 if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15) return true;
653 #elif defined(_LIBUNWIND_TARGET_AARCH64)
654 if (regNum >= UNW_ARM64_X0 && regNum <= UNW_ARM64_X30) return true;
655 #endif
656 return false;
657 }
658
659 template <typename A, typename R>
getReg(int regNum)660 unw_word_t UnwindCursor<A, R>::getReg(int regNum) {
661 switch (regNum) {
662 #if defined(_LIBUNWIND_TARGET_X86_64)
663 case UNW_REG_IP: return _msContext.Rip;
664 case UNW_X86_64_RAX: return _msContext.Rax;
665 case UNW_X86_64_RDX: return _msContext.Rdx;
666 case UNW_X86_64_RCX: return _msContext.Rcx;
667 case UNW_X86_64_RBX: return _msContext.Rbx;
668 case UNW_REG_SP:
669 case UNW_X86_64_RSP: return _msContext.Rsp;
670 case UNW_X86_64_RBP: return _msContext.Rbp;
671 case UNW_X86_64_RSI: return _msContext.Rsi;
672 case UNW_X86_64_RDI: return _msContext.Rdi;
673 case UNW_X86_64_R8: return _msContext.R8;
674 case UNW_X86_64_R9: return _msContext.R9;
675 case UNW_X86_64_R10: return _msContext.R10;
676 case UNW_X86_64_R11: return _msContext.R11;
677 case UNW_X86_64_R12: return _msContext.R12;
678 case UNW_X86_64_R13: return _msContext.R13;
679 case UNW_X86_64_R14: return _msContext.R14;
680 case UNW_X86_64_R15: return _msContext.R15;
681 #elif defined(_LIBUNWIND_TARGET_ARM)
682 case UNW_ARM_R0: return _msContext.R0;
683 case UNW_ARM_R1: return _msContext.R1;
684 case UNW_ARM_R2: return _msContext.R2;
685 case UNW_ARM_R3: return _msContext.R3;
686 case UNW_ARM_R4: return _msContext.R4;
687 case UNW_ARM_R5: return _msContext.R5;
688 case UNW_ARM_R6: return _msContext.R6;
689 case UNW_ARM_R7: return _msContext.R7;
690 case UNW_ARM_R8: return _msContext.R8;
691 case UNW_ARM_R9: return _msContext.R9;
692 case UNW_ARM_R10: return _msContext.R10;
693 case UNW_ARM_R11: return _msContext.R11;
694 case UNW_ARM_R12: return _msContext.R12;
695 case UNW_REG_SP:
696 case UNW_ARM_SP: return _msContext.Sp;
697 case UNW_ARM_LR: return _msContext.Lr;
698 case UNW_REG_IP:
699 case UNW_ARM_IP: return _msContext.Pc;
700 #elif defined(_LIBUNWIND_TARGET_AARCH64)
701 case UNW_REG_SP: return _msContext.Sp;
702 case UNW_REG_IP: return _msContext.Pc;
703 default: return _msContext.X[regNum - UNW_ARM64_X0];
704 #endif
705 }
706 _LIBUNWIND_ABORT("unsupported register");
707 }
708
709 template <typename A, typename R>
setReg(int regNum,unw_word_t value)710 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) {
711 switch (regNum) {
712 #if defined(_LIBUNWIND_TARGET_X86_64)
713 case UNW_REG_IP: _msContext.Rip = value; break;
714 case UNW_X86_64_RAX: _msContext.Rax = value; break;
715 case UNW_X86_64_RDX: _msContext.Rdx = value; break;
716 case UNW_X86_64_RCX: _msContext.Rcx = value; break;
717 case UNW_X86_64_RBX: _msContext.Rbx = value; break;
718 case UNW_REG_SP:
719 case UNW_X86_64_RSP: _msContext.Rsp = value; break;
720 case UNW_X86_64_RBP: _msContext.Rbp = value; break;
721 case UNW_X86_64_RSI: _msContext.Rsi = value; break;
722 case UNW_X86_64_RDI: _msContext.Rdi = value; break;
723 case UNW_X86_64_R8: _msContext.R8 = value; break;
724 case UNW_X86_64_R9: _msContext.R9 = value; break;
725 case UNW_X86_64_R10: _msContext.R10 = value; break;
726 case UNW_X86_64_R11: _msContext.R11 = value; break;
727 case UNW_X86_64_R12: _msContext.R12 = value; break;
728 case UNW_X86_64_R13: _msContext.R13 = value; break;
729 case UNW_X86_64_R14: _msContext.R14 = value; break;
730 case UNW_X86_64_R15: _msContext.R15 = value; break;
731 #elif defined(_LIBUNWIND_TARGET_ARM)
732 case UNW_ARM_R0: _msContext.R0 = value; break;
733 case UNW_ARM_R1: _msContext.R1 = value; break;
734 case UNW_ARM_R2: _msContext.R2 = value; break;
735 case UNW_ARM_R3: _msContext.R3 = value; break;
736 case UNW_ARM_R4: _msContext.R4 = value; break;
737 case UNW_ARM_R5: _msContext.R5 = value; break;
738 case UNW_ARM_R6: _msContext.R6 = value; break;
739 case UNW_ARM_R7: _msContext.R7 = value; break;
740 case UNW_ARM_R8: _msContext.R8 = value; break;
741 case UNW_ARM_R9: _msContext.R9 = value; break;
742 case UNW_ARM_R10: _msContext.R10 = value; break;
743 case UNW_ARM_R11: _msContext.R11 = value; break;
744 case UNW_ARM_R12: _msContext.R12 = value; break;
745 case UNW_REG_SP:
746 case UNW_ARM_SP: _msContext.Sp = value; break;
747 case UNW_ARM_LR: _msContext.Lr = value; break;
748 case UNW_REG_IP:
749 case UNW_ARM_IP: _msContext.Pc = value; break;
750 #elif defined(_LIBUNWIND_TARGET_AARCH64)
751 case UNW_REG_SP: _msContext.Sp = value; break;
752 case UNW_REG_IP: _msContext.Pc = value; break;
753 case UNW_ARM64_X0:
754 case UNW_ARM64_X1:
755 case UNW_ARM64_X2:
756 case UNW_ARM64_X3:
757 case UNW_ARM64_X4:
758 case UNW_ARM64_X5:
759 case UNW_ARM64_X6:
760 case UNW_ARM64_X7:
761 case UNW_ARM64_X8:
762 case UNW_ARM64_X9:
763 case UNW_ARM64_X10:
764 case UNW_ARM64_X11:
765 case UNW_ARM64_X12:
766 case UNW_ARM64_X13:
767 case UNW_ARM64_X14:
768 case UNW_ARM64_X15:
769 case UNW_ARM64_X16:
770 case UNW_ARM64_X17:
771 case UNW_ARM64_X18:
772 case UNW_ARM64_X19:
773 case UNW_ARM64_X20:
774 case UNW_ARM64_X21:
775 case UNW_ARM64_X22:
776 case UNW_ARM64_X23:
777 case UNW_ARM64_X24:
778 case UNW_ARM64_X25:
779 case UNW_ARM64_X26:
780 case UNW_ARM64_X27:
781 case UNW_ARM64_X28:
782 case UNW_ARM64_FP:
783 case UNW_ARM64_LR: _msContext.X[regNum - UNW_ARM64_X0] = value; break;
784 #endif
785 default:
786 _LIBUNWIND_ABORT("unsupported register");
787 }
788 }
789
790 template <typename A, typename R>
validFloatReg(int regNum)791 bool UnwindCursor<A, R>::validFloatReg(int regNum) {
792 #if defined(_LIBUNWIND_TARGET_ARM)
793 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) return true;
794 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) return true;
795 #elif defined(_LIBUNWIND_TARGET_AARCH64)
796 if (regNum >= UNW_ARM64_D0 && regNum <= UNW_ARM64_D31) return true;
797 #else
798 (void)regNum;
799 #endif
800 return false;
801 }
802
803 template <typename A, typename R>
getFloatReg(int regNum)804 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) {
805 #if defined(_LIBUNWIND_TARGET_ARM)
806 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) {
807 union {
808 uint32_t w;
809 float f;
810 } d;
811 d.w = _msContext.S[regNum - UNW_ARM_S0];
812 return d.f;
813 }
814 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) {
815 union {
816 uint64_t w;
817 double d;
818 } d;
819 d.w = _msContext.D[regNum - UNW_ARM_D0];
820 return d.d;
821 }
822 _LIBUNWIND_ABORT("unsupported float register");
823 #elif defined(_LIBUNWIND_TARGET_AARCH64)
824 return _msContext.V[regNum - UNW_ARM64_D0].D[0];
825 #else
826 (void)regNum;
827 _LIBUNWIND_ABORT("float registers unimplemented");
828 #endif
829 }
830
831 template <typename A, typename R>
setFloatReg(int regNum,unw_fpreg_t value)832 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) {
833 #if defined(_LIBUNWIND_TARGET_ARM)
834 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) {
835 union {
836 uint32_t w;
837 float f;
838 } d;
839 d.f = value;
840 _msContext.S[regNum - UNW_ARM_S0] = d.w;
841 }
842 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) {
843 union {
844 uint64_t w;
845 double d;
846 } d;
847 d.d = value;
848 _msContext.D[regNum - UNW_ARM_D0] = d.w;
849 }
850 _LIBUNWIND_ABORT("unsupported float register");
851 #elif defined(_LIBUNWIND_TARGET_AARCH64)
852 _msContext.V[regNum - UNW_ARM64_D0].D[0] = value;
853 #else
854 (void)regNum;
855 (void)value;
856 _LIBUNWIND_ABORT("float registers unimplemented");
857 #endif
858 }
859
jumpto()860 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() {
861 RtlRestoreContext(&_msContext, nullptr);
862 }
863
864 #ifdef __arm__
saveVFPAsX()865 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {}
866 #endif
867
868 template <typename A, typename R>
getRegisterName(int regNum)869 const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
870 return R::getRegisterName(regNum);
871 }
872
isSignalFrame()873 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
874 return false;
875 }
876
877 #else // !defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) || !defined(_WIN32)
878
879 /// UnwindCursor contains all state (including all register values) during
880 /// an unwind. This is normally stack allocated inside a unw_cursor_t.
881 template <typename A, typename R>
882 class UnwindCursor : public AbstractUnwindCursor{
883 typedef typename A::pint_t pint_t;
884 typedef typename A::addr_t addr_t;
885 typedef typename A::pc_t pc_t;
886
887 public:
888 UnwindCursor(unw_context_t *context, A &as);
889 UnwindCursor(A &as, void *threadArg);
~UnwindCursor()890 virtual ~UnwindCursor() {}
891 virtual bool validReg(int);
892 virtual unw_word_t getReg(int);
893 virtual pc_t getIP();
894 virtual void setReg(int, unw_word_t);
895 virtual bool validFloatReg(int);
896 virtual unw_fpreg_t getFloatReg(int);
897 virtual void setFloatReg(int, unw_fpreg_t);
898 virtual int step();
899 virtual void getInfo(unw_proc_info_t *);
900 virtual void jumpto();
901 virtual bool isSignalFrame();
902 virtual bool getFunctionName(char *buf, size_t len, size_t *off);
903 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false);
904 virtual const char *getRegisterName(int num);
905 #ifdef __arm__
906 virtual void saveVFPAsX();
907 #endif
908
909 // libunwind does not and should not depend on C++ library which means that we
910 // need our own defition of inline placement new.
operator new(size_t,UnwindCursor<A,R> * p)911 static void *operator new(size_t, UnwindCursor<A, R> *p) { return p; }
912
913 private:
914
915 #if defined(_LIBUNWIND_ARM_EHABI)
916 bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections §s);
917
stepWithEHABI()918 int stepWithEHABI() {
919 size_t len = 0;
920 size_t off = 0;
921 // FIXME: Calling decode_eht_entry() here is violating the libunwind
922 // abstraction layer.
923 const uint32_t *ehtp =
924 decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info),
925 &off, &len);
926 if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) !=
927 _URC_CONTINUE_UNWIND)
928 return UNW_STEP_END;
929 return UNW_STEP_SUCCESS;
930 }
931 #endif
932
933 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
934 bool getInfoFromDwarfSection(pc_t pc, const UnwindInfoSections §s,
935 uint32_t fdeSectionOffsetHint = 0);
stepWithDwarfFDE()936 int stepWithDwarfFDE() {
937 return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace, this->getIP(),
938 (pint_t)_info.unwind_info,
939 _registers, _isSignalFrame);
940 }
941 #endif
942
943 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
944 bool getInfoFromCompactEncodingSection(pc_t pc,
945 const UnwindInfoSections §s);
stepWithCompactEncoding()946 int stepWithCompactEncoding() {
947 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
948 if ( compactSaysUseDwarf() )
949 return stepWithDwarfFDE();
950 #endif
951 R dummy;
952 return stepWithCompactEncoding(dummy);
953 }
954
955 #if defined(_LIBUNWIND_TARGET_X86_64)
stepWithCompactEncoding(Registers_x86_64 &)956 int stepWithCompactEncoding(Registers_x86_64 &) {
957 return CompactUnwinder_x86_64<A>::stepWithCompactEncoding(
958 _info.format, _info.start_ip, _addressSpace, _registers);
959 }
960 #endif
961
962 #if defined(_LIBUNWIND_TARGET_I386)
stepWithCompactEncoding(Registers_x86 &)963 int stepWithCompactEncoding(Registers_x86 &) {
964 return CompactUnwinder_x86<A>::stepWithCompactEncoding(
965 _info.format, (uint32_t)_info.start_ip, _addressSpace, _registers);
966 }
967 #endif
968
969 #if defined(_LIBUNWIND_TARGET_PPC)
stepWithCompactEncoding(Registers_ppc &)970 int stepWithCompactEncoding(Registers_ppc &) {
971 return UNW_EINVAL;
972 }
973 #endif
974
975 #if defined(_LIBUNWIND_TARGET_PPC64)
stepWithCompactEncoding(Registers_ppc64 &)976 int stepWithCompactEncoding(Registers_ppc64 &) {
977 return UNW_EINVAL;
978 }
979 #endif
980
981
982 #if defined(_LIBUNWIND_TARGET_AARCH64)
stepWithCompactEncoding(Registers_arm64 &)983 int stepWithCompactEncoding(Registers_arm64 &) {
984 return CompactUnwinder_arm64<A>::stepWithCompactEncoding(
985 _info.format, _info.start_ip, _addressSpace, _registers);
986 }
987 #endif
988
989 #if defined(_LIBUNWIND_TARGET_MIPS_O32)
stepWithCompactEncoding(Registers_mips_o32 &)990 int stepWithCompactEncoding(Registers_mips_o32 &) {
991 return UNW_EINVAL;
992 }
993 #endif
994
995 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI)
stepWithCompactEncoding(Registers_mips_newabi &)996 int stepWithCompactEncoding(Registers_mips_newabi &) {
997 return UNW_EINVAL;
998 }
999 #endif
1000
1001 #if defined(_LIBUNWIND_TARGET_SPARC)
stepWithCompactEncoding(Registers_sparc &)1002 int stepWithCompactEncoding(Registers_sparc &) { return UNW_EINVAL; }
1003 #endif
1004
1005 #if defined (_LIBUNWIND_TARGET_RISCV)
stepWithCompactEncoding(Registers_riscv &)1006 int stepWithCompactEncoding(Registers_riscv &) {
1007 return UNW_EINVAL;
1008 }
1009 #endif
1010
compactSaysUseDwarf(uint32_t * offset=NULL) const1011 bool compactSaysUseDwarf(uint32_t *offset=NULL) const {
1012 R dummy;
1013 return compactSaysUseDwarf(dummy, offset);
1014 }
1015
1016 #if defined(_LIBUNWIND_TARGET_X86_64)
compactSaysUseDwarf(Registers_x86_64 &,uint32_t * offset) const1017 bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const {
1018 if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) {
1019 if (offset)
1020 *offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET);
1021 return true;
1022 }
1023 return false;
1024 }
1025 #endif
1026
1027 #if defined(_LIBUNWIND_TARGET_I386)
compactSaysUseDwarf(Registers_x86 &,uint32_t * offset) const1028 bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const {
1029 if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) {
1030 if (offset)
1031 *offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET);
1032 return true;
1033 }
1034 return false;
1035 }
1036 #endif
1037
1038 #if defined(_LIBUNWIND_TARGET_PPC)
compactSaysUseDwarf(Registers_ppc &,uint32_t *) const1039 bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const {
1040 return true;
1041 }
1042 #endif
1043
1044 #if defined(_LIBUNWIND_TARGET_PPC64)
compactSaysUseDwarf(Registers_ppc64 &,uint32_t *) const1045 bool compactSaysUseDwarf(Registers_ppc64 &, uint32_t *) const {
1046 return true;
1047 }
1048 #endif
1049
1050 #if defined(_LIBUNWIND_TARGET_AARCH64)
compactSaysUseDwarf(Registers_arm64 &,uint32_t * offset) const1051 bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const {
1052 if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) {
1053 if (offset)
1054 *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET);
1055 return true;
1056 }
1057 return false;
1058 }
1059 #endif
1060
1061 #if defined(_LIBUNWIND_TARGET_MIPS_O32)
compactSaysUseDwarf(Registers_mips_o32 &,uint32_t *) const1062 bool compactSaysUseDwarf(Registers_mips_o32 &, uint32_t *) const {
1063 return true;
1064 }
1065 #endif
1066
1067 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI)
compactSaysUseDwarf(Registers_mips_newabi &,uint32_t *) const1068 bool compactSaysUseDwarf(Registers_mips_newabi &, uint32_t *) const {
1069 return true;
1070 }
1071 #endif
1072
1073 #if defined(_LIBUNWIND_TARGET_MIPS_CHERI)
compactSaysUseDwarf(Registers_mips_cheri &,uint32_t *) const1074 bool compactSaysUseDwarf(Registers_mips_cheri &, uint32_t *) const {
1075 return true;
1076 }
1077 #endif
1078
1079 #if defined(_LIBUNWIND_TARGET_SPARC)
compactSaysUseDwarf(Registers_sparc &,uint32_t *) const1080 bool compactSaysUseDwarf(Registers_sparc &, uint32_t *) const { return true; }
1081 #endif
1082
1083 #if defined (_LIBUNWIND_TARGET_RISCV)
compactSaysUseDwarf(Registers_riscv &,uint32_t *) const1084 bool compactSaysUseDwarf(Registers_riscv &, uint32_t *) const {
1085 return true;
1086 }
1087 #endif
1088
1089 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
1090
1091 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
dwarfEncoding() const1092 compact_unwind_encoding_t dwarfEncoding() const {
1093 R dummy;
1094 return dwarfEncoding(dummy);
1095 }
1096
1097 #if defined(_LIBUNWIND_TARGET_X86_64)
dwarfEncoding(Registers_x86_64 &) const1098 compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const {
1099 return UNWIND_X86_64_MODE_DWARF;
1100 }
1101 #endif
1102
1103 #if defined(_LIBUNWIND_TARGET_I386)
dwarfEncoding(Registers_x86 &) const1104 compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const {
1105 return UNWIND_X86_MODE_DWARF;
1106 }
1107 #endif
1108
1109 #if defined(_LIBUNWIND_TARGET_PPC)
dwarfEncoding(Registers_ppc &) const1110 compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const {
1111 return 0;
1112 }
1113 #endif
1114
1115 #if defined(_LIBUNWIND_TARGET_PPC64)
dwarfEncoding(Registers_ppc64 &) const1116 compact_unwind_encoding_t dwarfEncoding(Registers_ppc64 &) const {
1117 return 0;
1118 }
1119 #endif
1120
1121 #if defined(_LIBUNWIND_TARGET_AARCH64)
dwarfEncoding(Registers_arm64 &) const1122 compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const {
1123 return UNWIND_ARM64_MODE_DWARF;
1124 }
1125 #endif
1126
1127 #if defined(_LIBUNWIND_TARGET_ARM)
dwarfEncoding(Registers_arm &) const1128 compact_unwind_encoding_t dwarfEncoding(Registers_arm &) const {
1129 return 0;
1130 }
1131 #endif
1132
1133 #if defined (_LIBUNWIND_TARGET_OR1K)
dwarfEncoding(Registers_or1k &) const1134 compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const {
1135 return 0;
1136 }
1137 #endif
1138
1139 #if defined (_LIBUNWIND_TARGET_HEXAGON)
dwarfEncoding(Registers_hexagon &) const1140 compact_unwind_encoding_t dwarfEncoding(Registers_hexagon &) const {
1141 return 0;
1142 }
1143 #endif
1144
1145 #if defined (_LIBUNWIND_TARGET_MIPS_O32)
dwarfEncoding(Registers_mips_o32 &) const1146 compact_unwind_encoding_t dwarfEncoding(Registers_mips_o32 &) const {
1147 return 0;
1148 }
1149 #endif
1150
1151 #if defined (_LIBUNWIND_TARGET_MIPS_NEWABI)
dwarfEncoding(Registers_mips_newabi &) const1152 compact_unwind_encoding_t dwarfEncoding(Registers_mips_newabi &) const {
1153 return 0;
1154 }
1155 #endif
1156
1157 #if defined(_LIBUNWIND_TARGET_MIPS_CHERI)
dwarfEncoding(Registers_mips_cheri &) const1158 compact_unwind_encoding_t dwarfEncoding(Registers_mips_cheri &) const {
1159 return 0;
1160 }
1161 #endif
1162
1163 #if defined(_LIBUNWIND_TARGET_SPARC)
dwarfEncoding(Registers_sparc &) const1164 compact_unwind_encoding_t dwarfEncoding(Registers_sparc &) const { return 0; }
1165 #endif
1166
1167 #if defined (_LIBUNWIND_TARGET_RISCV)
dwarfEncoding(Registers_riscv &) const1168 compact_unwind_encoding_t dwarfEncoding(Registers_riscv &) const {
1169 return 0;
1170 }
1171 #endif
1172
1173 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1174
1175 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
1176 // For runtime environments using SEH unwind data without Windows runtime
1177 // support.
getLastPC() const1178 pint_t getLastPC() const { /* FIXME: Implement */ return 0; }
setLastPC(pint_t pc)1179 void setLastPC(pint_t pc) { /* FIXME: Implement */ }
lookUpSEHUnwindInfo(pint_t pc,pint_t * base)1180 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) {
1181 /* FIXME: Implement */
1182 *base = 0;
1183 return nullptr;
1184 }
1185 bool getInfoFromSEH(pint_t pc);
stepWithSEHData()1186 int stepWithSEHData() { /* FIXME: Implement */ return 0; }
1187 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
1188
1189
1190 A &_addressSpace;
1191 R _registers;
1192 unw_proc_info_t _info;
1193 bool _unwindInfoMissing;
1194 bool _isSignalFrame;
1195 };
1196
size()1197 template <unsigned A, unsigned B> void size() { static_assert(A == B, "fail"); }
1198
1199 template <typename A, typename R>
UnwindCursor(unw_context_t * context,A & as)1200 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as)
1201 : _addressSpace(as), _registers(context), _unwindInfoMissing(false),
1202 _isSignalFrame(false) {
1203 size<sizeof(UnwindCursor<A, R>), sizeof(unw_cursor_t)>();
1204 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit),
1205 "UnwindCursor<> does not fit in unw_cursor_t");
1206 memset(&_info, 0, sizeof(_info));
1207 }
1208
1209 template <typename A, typename R>
UnwindCursor(A & as,void *)1210 UnwindCursor<A, R>::UnwindCursor(A &as, void *)
1211 : _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) {
1212 memset(&_info, 0, sizeof(_info));
1213 // FIXME
1214 // fill in _registers from thread arg
1215 }
1216
1217
1218 template <typename A, typename R>
validReg(int regNum)1219 bool UnwindCursor<A, R>::validReg(int regNum) {
1220 return _registers.validRegister(regNum);
1221 }
1222
1223 template <typename A, typename R>
getReg(int regNum)1224 unw_word_t UnwindCursor<A, R>::getReg(int regNum) {
1225 CHERI_DBG("%s: %d = %#p\n", __func__, regNum, (void*)_registers.getRegister(regNum));
1226 return _registers.getRegister(regNum);
1227 }
1228
getIP()1229 template <typename A, typename R> typename A::pc_t UnwindCursor<A, R>::getIP() {
1230 pint_t ip = _registers.getRegister(UNW_REG_IP);
1231 CHERI_DBG("%s: IP = %#p\n", __func__, (void *)ip);
1232 return pc_t{ip};
1233 }
1234
1235 template <typename A, typename R>
setReg(int regNum,unw_word_t value)1236 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) {
1237 CHERI_DBG("%s: %d = %#p\n", __func__, regNum, (void*)value);
1238 _registers.setRegister(regNum, (typename A::pint_t)value);
1239 }
1240
1241 template <typename A, typename R>
validFloatReg(int regNum)1242 bool UnwindCursor<A, R>::validFloatReg(int regNum) {
1243 return _registers.validFloatRegister(regNum);
1244 }
1245
1246 template <typename A, typename R>
getFloatReg(int regNum)1247 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) {
1248 return _registers.getFloatRegister(regNum);
1249 }
1250
1251 template <typename A, typename R>
setFloatReg(int regNum,unw_fpreg_t value)1252 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) {
1253 _registers.setFloatRegister(regNum, value);
1254 }
1255
jumpto()1256 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() {
1257 _registers.jumpto();
1258 }
1259
1260 #ifdef __arm__
saveVFPAsX()1261 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {
1262 _registers.saveVFPAsX();
1263 }
1264 #endif
1265
1266 template <typename A, typename R>
getRegisterName(int regNum)1267 const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
1268 return _registers.getRegisterName(regNum);
1269 }
1270
isSignalFrame()1271 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
1272 return _isSignalFrame;
1273 }
1274
1275 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
1276
1277 #if defined(_LIBUNWIND_ARM_EHABI)
1278 template<typename A>
1279 struct EHABISectionIterator {
1280 typedef EHABISectionIterator _Self;
1281
1282 typedef typename A::pint_t value_type;
1283 typedef typename A::pint_t* pointer;
1284 typedef typename A::pint_t& reference;
1285 typedef size_t size_type;
1286 typedef size_t difference_type;
1287
beginlibunwind::EHABISectionIterator1288 static _Self begin(A& addressSpace, const UnwindInfoSections& sects) {
1289 return _Self(addressSpace, sects, 0);
1290 }
endlibunwind::EHABISectionIterator1291 static _Self end(A& addressSpace, const UnwindInfoSections& sects) {
1292 return _Self(addressSpace, sects,
1293 sects.arm_section_length / sizeof(EHABIIndexEntry));
1294 }
1295
EHABISectionIteratorlibunwind::EHABISectionIterator1296 EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i)
1297 : _i(i), _addressSpace(&addressSpace), _sects(§s) {}
1298
operator ++libunwind::EHABISectionIterator1299 _Self& operator++() { ++_i; return *this; }
operator +=libunwind::EHABISectionIterator1300 _Self& operator+=(size_t a) { _i += a; return *this; }
operator --libunwind::EHABISectionIterator1301 _Self& operator--() { assert(_i > 0); --_i; return *this; }
operator -=libunwind::EHABISectionIterator1302 _Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; }
1303
operator +libunwind::EHABISectionIterator1304 _Self operator+(size_t a) { _Self out = *this; out._i += a; return out; }
operator -libunwind::EHABISectionIterator1305 _Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; }
1306
operator -libunwind::EHABISectionIterator1307 size_t operator-(const _Self& other) const { return _i - other._i; }
1308
operator ==libunwind::EHABISectionIterator1309 bool operator==(const _Self& other) const {
1310 assert(_addressSpace == other._addressSpace);
1311 assert(_sects == other._sects);
1312 return _i == other._i;
1313 }
1314
operator !=libunwind::EHABISectionIterator1315 bool operator!=(const _Self& other) const {
1316 assert(_addressSpace == other._addressSpace);
1317 assert(_sects == other._sects);
1318 return _i != other._i;
1319 }
1320
operator *libunwind::EHABISectionIterator1321 typename A::pint_t operator*() const { return functionAddress(); }
1322
functionAddresslibunwind::EHABISectionIterator1323 typename A::pint_t functionAddress() const {
1324 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
1325 EHABIIndexEntry, _i, functionOffset);
1326 return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr));
1327 }
1328
dataAddresslibunwind::EHABISectionIterator1329 typename A::pint_t dataAddress() {
1330 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
1331 EHABIIndexEntry, _i, data);
1332 return indexAddr;
1333 }
1334
1335 private:
1336 size_t _i;
1337 A* _addressSpace;
1338 const UnwindInfoSections* _sects;
1339 };
1340
1341 namespace {
1342
1343 template <typename A>
EHABISectionUpperBound(EHABISectionIterator<A> first,EHABISectionIterator<A> last,typename A::pint_t value)1344 EHABISectionIterator<A> EHABISectionUpperBound(
1345 EHABISectionIterator<A> first,
1346 EHABISectionIterator<A> last,
1347 typename A::pint_t value) {
1348 size_t len = last - first;
1349 while (len > 0) {
1350 size_t l2 = len / 2;
1351 EHABISectionIterator<A> m = first + l2;
1352 if (value < *m) {
1353 len = l2;
1354 } else {
1355 first = ++m;
1356 len -= l2 + 1;
1357 }
1358 }
1359 return first;
1360 }
1361
1362 }
1363
1364 template <typename A, typename R>
getInfoFromEHABISection(pc_t pc,const UnwindInfoSections & sects)1365 bool UnwindCursor<A, R>::getInfoFromEHABISection(
1366 pc_t pc, const UnwindInfoSections §s) {
1367 EHABISectionIterator<A> begin =
1368 EHABISectionIterator<A>::begin(_addressSpace, sects);
1369 EHABISectionIterator<A> end =
1370 EHABISectionIterator<A>::end(_addressSpace, sects);
1371 if (begin == end)
1372 return false;
1373
1374 EHABISectionIterator<A> itNextPC = EHABISectionUpperBound(begin, end, pc);
1375 if (itNextPC == begin)
1376 return false;
1377 EHABISectionIterator<A> itThisPC = itNextPC - 1;
1378
1379 pint_t thisPC = itThisPC.functionAddress();
1380 // If an exception is thrown from a function, corresponding to the last entry
1381 // in the table, we don't really know the function extent and have to choose a
1382 // value for nextPC. Choosing max() will allow the range check during trace to
1383 // succeed.
1384 pint_t nextPC = (itNextPC == end) ? UINTPTR_MAX : itNextPC.functionAddress();
1385 pint_t indexDataAddr = itThisPC.dataAddress();
1386
1387 if (indexDataAddr == 0)
1388 return false;
1389
1390 uint32_t indexData = _addressSpace.get32(indexDataAddr);
1391 if (indexData == UNW_EXIDX_CANTUNWIND)
1392 return false;
1393
1394 // If the high bit is set, the exception handling table entry is inline inside
1395 // the index table entry on the second word (aka |indexDataAddr|). Otherwise,
1396 // the table points at an offset in the exception handling table (section 5
1397 // EHABI).
1398 pint_t exceptionTableAddr;
1399 uint32_t exceptionTableData;
1400 bool isSingleWordEHT;
1401 if (indexData & 0x80000000) {
1402 exceptionTableAddr = indexDataAddr;
1403 // TODO(ajwong): Should this data be 0?
1404 exceptionTableData = indexData;
1405 isSingleWordEHT = true;
1406 } else {
1407 exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData);
1408 exceptionTableData = _addressSpace.get32(exceptionTableAddr);
1409 isSingleWordEHT = false;
1410 }
1411
1412 // Now we know the 3 things:
1413 // exceptionTableAddr -- exception handler table entry.
1414 // exceptionTableData -- the data inside the first word of the eht entry.
1415 // isSingleWordEHT -- whether the entry is in the index.
1416 unw_word_t personalityRoutine = 0xbadf00d;
1417 bool scope32 = false;
1418 uintptr_t lsda;
1419
1420 // If the high bit in the exception handling table entry is set, the entry is
1421 // in compact form (section 6.3 EHABI).
1422 if (exceptionTableData & 0x80000000) {
1423 // Grab the index of the personality routine from the compact form.
1424 uint32_t choice = (exceptionTableData & 0x0f000000) >> 24;
1425 uint32_t extraWords = 0;
1426 switch (choice) {
1427 case 0:
1428 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0;
1429 extraWords = 0;
1430 scope32 = false;
1431 lsda = isSingleWordEHT ? 0 : (exceptionTableAddr + 4);
1432 break;
1433 case 1:
1434 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1;
1435 extraWords = (exceptionTableData & 0x00ff0000) >> 16;
1436 scope32 = false;
1437 lsda = exceptionTableAddr + (extraWords + 1) * 4;
1438 break;
1439 case 2:
1440 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2;
1441 extraWords = (exceptionTableData & 0x00ff0000) >> 16;
1442 scope32 = true;
1443 lsda = exceptionTableAddr + (extraWords + 1) * 4;
1444 break;
1445 default:
1446 _LIBUNWIND_ABORT("unknown personality routine");
1447 return false;
1448 }
1449
1450 if (isSingleWordEHT) {
1451 if (extraWords != 0) {
1452 _LIBUNWIND_ABORT("index inlined table detected but pr function "
1453 "requires extra words");
1454 return false;
1455 }
1456 }
1457 } else {
1458 pint_t personalityAddr =
1459 exceptionTableAddr + signExtendPrel31(exceptionTableData);
1460 personalityRoutine = personalityAddr;
1461
1462 // ARM EHABI # 6.2, # 9.2
1463 //
1464 // +---- ehtp
1465 // v
1466 // +--------------------------------------+
1467 // | +--------+--------+--------+-------+ |
1468 // | |0| prel31 to personalityRoutine | |
1469 // | +--------+--------+--------+-------+ |
1470 // | | N | unwind opcodes | | <-- UnwindData
1471 // | +--------+--------+--------+-------+ |
1472 // | | Word 2 unwind opcodes | |
1473 // | +--------+--------+--------+-------+ |
1474 // | ... |
1475 // | +--------+--------+--------+-------+ |
1476 // | | Word N unwind opcodes | |
1477 // | +--------+--------+--------+-------+ |
1478 // | | LSDA | | <-- lsda
1479 // | | ... | |
1480 // | +--------+--------+--------+-------+ |
1481 // +--------------------------------------+
1482
1483 uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1;
1484 uint32_t FirstDataWord = *UnwindData;
1485 size_t N = ((FirstDataWord >> 24) & 0xff);
1486 size_t NDataWords = N + 1;
1487 lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords);
1488 }
1489
1490 _info.start_ip = thisPC;
1491 _info.end_ip = nextPC;
1492 _info.handler = personalityRoutine;
1493 _info.unwind_info = exceptionTableAddr;
1494 _info.lsda = lsda;
1495 // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0.
1496 _info.flags = (isSingleWordEHT ? 1 : 0) | (scope32 ? 0x2 : 0); // Use enum?
1497
1498 return true;
1499 }
1500 #endif
1501
1502 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1503 template <typename A, typename R>
getInfoFromDwarfSection(pc_t pc,const UnwindInfoSections & sects,uint32_t fdeSectionOffsetHint)1504 bool UnwindCursor<A, R>::getInfoFromDwarfSection(
1505 pc_t pc, const UnwindInfoSections §s, uint32_t fdeSectionOffsetHint) {
1506 typename CFI_Parser<A>::FDE_Info fdeInfo;
1507 typename CFI_Parser<A>::CIE_Info cieInfo;
1508 bool foundFDE = false;
1509 bool foundInCache = false;
1510 // If compact encoding table gave offset into dwarf section, go directly there
1511 if (fdeSectionOffsetHint != 0) {
1512 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section(),
1513 (uint32_t)sects.dwarf_section_length,
1514 sects.dwarf_section() + fdeSectionOffsetHint,
1515 &fdeInfo, &cieInfo);
1516 }
1517 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
1518 if (!foundFDE && (sects.dwarf_index_section() != 0)) {
1519 foundFDE = EHHeaderParser<A>::findFDE(
1520 _addressSpace, pc, sects.dwarf_index_section(),
1521 (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo);
1522 }
1523 #endif
1524 if (!foundFDE) {
1525 // otherwise, search cache of previously found FDEs.
1526 pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc.address());
1527 if (cachedFDE != 0) {
1528 foundFDE =
1529 CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section(),
1530 (uint32_t)sects.dwarf_section_length,
1531 cachedFDE, &fdeInfo, &cieInfo);
1532 foundInCache = foundFDE;
1533 }
1534 }
1535 if (!foundFDE) {
1536 // Still not found, do full scan of __eh_frame section.
1537 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section(),
1538 (uint32_t)sects.dwarf_section_length, 0,
1539 &fdeInfo, &cieInfo);
1540 }
1541 if (foundFDE) {
1542 typename CFI_Parser<A>::PrologInfo prolog;
1543 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
1544 pc.address(), R::getArch(),
1545 &prolog)) {
1546 // Save off parsed FDE info
1547 _info.start_ip = fdeInfo.pcStart;
1548 _info.end_ip = fdeInfo.pcEnd;
1549 _info.lsda = fdeInfo.lsda;
1550 _info.handler = cieInfo.personality;
1551 _info.gp = prolog.spExtraArgSize;
1552 _info.flags = 0;
1553 _info.format = dwarfEncoding();
1554 _info.unwind_info = fdeInfo.fdeStart;
1555 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
1556 _info.extra = (unw_word_t) sects.dso_base;
1557
1558 // Add to cache (to make next lookup faster) if we had no hint
1559 // and there was no index.
1560 if (!foundInCache && (fdeSectionOffsetHint == 0)) {
1561 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX)
1562 if (sects.dwarf_index_section() == 0)
1563 #endif
1564 DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd,
1565 fdeInfo.fdeStart);
1566 }
1567 return true;
1568 }
1569 }
1570 //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc);
1571 return false;
1572 }
1573 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1574
1575
1576 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
1577 template <typename A, typename R>
getInfoFromCompactEncodingSection(pc_t pc_raw,const UnwindInfoSections & sects)1578 bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(
1579 pc_t pc_raw, const UnwindInfoSections §s) {
1580 addr_t pc = pc_raw.address();
1581 const bool log = false;
1582 if (log)
1583 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n",
1584 (uint64_t)pc, (uint64_t)sects.dso_base);
1585
1586 const UnwindSectionHeader<A> sectionHeader(_addressSpace,
1587 sects.compact_unwind_section);
1588 if (sectionHeader.version() != UNWIND_SECTION_VERSION)
1589 return false;
1590
1591 // do a binary search of top level index to find page with unwind info
1592 pint_t targetFunctionOffset = pc - sects.dso_base;
1593 const UnwindSectionIndexArray<A> topIndex(_addressSpace,
1594 sects.compact_unwind_section
1595 + sectionHeader.indexSectionOffset());
1596 uint32_t low = 0;
1597 uint32_t high = sectionHeader.indexCount();
1598 uint32_t last = high - 1;
1599 while (low < high) {
1600 uint32_t mid = (low + high) / 2;
1601 //if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n",
1602 //mid, low, high, topIndex.functionOffset(mid));
1603 if (topIndex.functionOffset(mid) <= targetFunctionOffset) {
1604 if ((mid == last) ||
1605 (topIndex.functionOffset(mid + 1) > targetFunctionOffset)) {
1606 low = mid;
1607 break;
1608 } else {
1609 low = mid + 1;
1610 }
1611 } else {
1612 high = mid;
1613 }
1614 }
1615 const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low);
1616 const uint32_t firstLevelNextPageFunctionOffset =
1617 topIndex.functionOffset(low + 1);
1618 const pint_t secondLevelAddr =
1619 sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low);
1620 const pint_t lsdaArrayStartAddr =
1621 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low);
1622 const pint_t lsdaArrayEndAddr =
1623 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1);
1624 if (log)
1625 fprintf(stderr, "\tfirst level search for result index=%d "
1626 "to secondLevelAddr=0x%llX\n",
1627 low, (uint64_t) secondLevelAddr);
1628 // do a binary search of second level page index
1629 uint32_t encoding = 0;
1630 pint_t funcStart = 0;
1631 pint_t funcEnd = 0;
1632 pint_t lsda = 0;
1633 pint_t personality = 0;
1634 uint32_t pageKind = _addressSpace.get32(secondLevelAddr);
1635 if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) {
1636 // regular page
1637 UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace,
1638 secondLevelAddr);
1639 UnwindSectionRegularArray<A> pageIndex(
1640 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
1641 // binary search looks for entry with e where index[e].offset <= pc <
1642 // index[e+1].offset
1643 if (log)
1644 fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in "
1645 "regular page starting at secondLevelAddr=0x%llX\n",
1646 (uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr);
1647 low = 0;
1648 high = pageHeader.entryCount();
1649 while (low < high) {
1650 uint32_t mid = (low + high) / 2;
1651 if (pageIndex.functionOffset(mid) <= targetFunctionOffset) {
1652 if (mid == (uint32_t)(pageHeader.entryCount() - 1)) {
1653 // at end of table
1654 low = mid;
1655 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
1656 break;
1657 } else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) {
1658 // next is too big, so we found it
1659 low = mid;
1660 funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base;
1661 break;
1662 } else {
1663 low = mid + 1;
1664 }
1665 } else {
1666 high = mid;
1667 }
1668 }
1669 encoding = pageIndex.encoding(low);
1670 funcStart = pageIndex.functionOffset(low) + sects.dso_base;
1671 if (pc < funcStart) {
1672 if (log)
1673 fprintf(
1674 stderr,
1675 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
1676 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
1677 return false;
1678 }
1679 if (pc > funcEnd) {
1680 if (log)
1681 fprintf(
1682 stderr,
1683 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
1684 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
1685 return false;
1686 }
1687 } else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) {
1688 // compressed page
1689 UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace,
1690 secondLevelAddr);
1691 UnwindSectionCompressedArray<A> pageIndex(
1692 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
1693 const uint32_t targetFunctionPageOffset =
1694 (uint32_t)(targetFunctionOffset - firstLevelFunctionOffset);
1695 // binary search looks for entry with e where index[e].offset <= pc <
1696 // index[e+1].offset
1697 if (log)
1698 fprintf(stderr, "\tbinary search of compressed page starting at "
1699 "secondLevelAddr=0x%llX\n",
1700 (uint64_t) secondLevelAddr);
1701 low = 0;
1702 last = pageHeader.entryCount() - 1;
1703 high = pageHeader.entryCount();
1704 while (low < high) {
1705 uint32_t mid = (low + high) / 2;
1706 if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) {
1707 if ((mid == last) ||
1708 (pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) {
1709 low = mid;
1710 break;
1711 } else {
1712 low = mid + 1;
1713 }
1714 } else {
1715 high = mid;
1716 }
1717 }
1718 funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset
1719 + sects.dso_base;
1720 if (low < last)
1721 funcEnd =
1722 pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset
1723 + sects.dso_base;
1724 else
1725 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
1726 if (pc < funcStart) {
1727 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
1728 "level compressed unwind table. funcStart=0x%llX",
1729 (uint64_t) pc, (uint64_t) funcStart);
1730 return false;
1731 }
1732 if (pc > funcEnd) {
1733 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
1734 "level compressed unwind table. funcEnd=0x%llX",
1735 (uint64_t) pc, (uint64_t) funcEnd);
1736 return false;
1737 }
1738 uint16_t encodingIndex = pageIndex.encodingIndex(low);
1739 if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) {
1740 // encoding is in common table in section header
1741 encoding = _addressSpace.get32(
1742 sects.compact_unwind_section +
1743 sectionHeader.commonEncodingsArraySectionOffset() +
1744 encodingIndex * sizeof(uint32_t));
1745 } else {
1746 // encoding is in page specific table
1747 uint16_t pageEncodingIndex =
1748 encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount();
1749 encoding = _addressSpace.get32(secondLevelAddr +
1750 pageHeader.encodingsPageOffset() +
1751 pageEncodingIndex * sizeof(uint32_t));
1752 }
1753 } else {
1754 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info at 0x%0llX bad second "
1755 "level page",
1756 (uint64_t) sects.compact_unwind_section);
1757 return false;
1758 }
1759
1760 // look up LSDA, if encoding says function has one
1761 if (encoding & UNWIND_HAS_LSDA) {
1762 UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr);
1763 uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base);
1764 low = 0;
1765 high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) /
1766 sizeof(unwind_info_section_header_lsda_index_entry);
1767 // binary search looks for entry with exact match for functionOffset
1768 if (log)
1769 fprintf(stderr,
1770 "\tbinary search of lsda table for targetFunctionOffset=0x%08X\n",
1771 funcStartOffset);
1772 while (low < high) {
1773 uint32_t mid = (low + high) / 2;
1774 if (lsdaIndex.functionOffset(mid) == funcStartOffset) {
1775 lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base;
1776 break;
1777 } else if (lsdaIndex.functionOffset(mid) < funcStartOffset) {
1778 low = mid + 1;
1779 } else {
1780 high = mid;
1781 }
1782 }
1783 if (lsda == 0) {
1784 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for "
1785 "pc=0x%0llX, but lsda table has no entry",
1786 encoding, (uint64_t) pc);
1787 return false;
1788 }
1789 }
1790
1791 // extact personality routine, if encoding says function has one
1792 uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >>
1793 (__builtin_ctz(UNWIND_PERSONALITY_MASK));
1794 if (personalityIndex != 0) {
1795 --personalityIndex; // change 1-based to zero-based index
1796 if (personalityIndex > sectionHeader.personalityArrayCount()) {
1797 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, "
1798 "but personality table has only %d entries",
1799 encoding, personalityIndex,
1800 sectionHeader.personalityArrayCount());
1801 return false;
1802 }
1803 int32_t personalityDelta = (int32_t)_addressSpace.get32(
1804 sects.compact_unwind_section +
1805 sectionHeader.personalityArraySectionOffset() +
1806 personalityIndex * sizeof(uint32_t));
1807 pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta;
1808 personality = _addressSpace.getP(personalityPointer);
1809 if (log)
1810 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
1811 "personalityDelta=0x%08X, personality=0x%08llX\n",
1812 (uint64_t) pc, personalityDelta, (uint64_t) personality);
1813 }
1814
1815 if (log)
1816 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
1817 "encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n",
1818 (uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart);
1819 _info.start_ip = funcStart;
1820 _info.end_ip = funcEnd;
1821 _info.lsda = lsda;
1822 _info.handler = personality;
1823 _info.gp = 0;
1824 _info.flags = 0;
1825 _info.format = encoding;
1826 _info.unwind_info = 0;
1827 _info.unwind_info_size = 0;
1828 _info.extra = sects.dso_base;
1829 return true;
1830 }
1831 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
1832
1833
1834 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
1835 template <typename A, typename R>
getInfoFromSEH(pint_t pc)1836 bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) {
1837 pint_t base;
1838 RUNTIME_FUNCTION *unwindEntry = lookUpSEHUnwindInfo(pc, &base);
1839 if (!unwindEntry) {
1840 _LIBUNWIND_DEBUG_LOG("\tpc not in table, pc=0x%llX", (uint64_t) pc);
1841 return false;
1842 }
1843 _info.gp = 0;
1844 _info.flags = 0;
1845 _info.format = 0;
1846 _info.unwind_info_size = sizeof(RUNTIME_FUNCTION);
1847 _info.unwind_info = reinterpret_cast<unw_word_t>(unwindEntry);
1848 _info.extra = base;
1849 _info.start_ip = base + unwindEntry->BeginAddress;
1850 #ifdef _LIBUNWIND_TARGET_X86_64
1851 _info.end_ip = base + unwindEntry->EndAddress;
1852 // Only fill in the handler and LSDA if they're stale.
1853 if (pc != getLastPC()) {
1854 UNWIND_INFO *xdata = reinterpret_cast<UNWIND_INFO *>(base + unwindEntry->UnwindData);
1855 if (xdata->Flags & (UNW_FLAG_EHANDLER|UNW_FLAG_UHANDLER)) {
1856 // The personality is given in the UNWIND_INFO itself. The LSDA immediately
1857 // follows the UNWIND_INFO. (This follows how both Clang and MSVC emit
1858 // these structures.)
1859 // N.B. UNWIND_INFO structs are DWORD-aligned.
1860 uint32_t lastcode = (xdata->CountOfCodes + 1) & ~1;
1861 const uint32_t *handler = reinterpret_cast<uint32_t *>(&xdata->UnwindCodes[lastcode]);
1862 _info.lsda = reinterpret_cast<unw_word_t>(handler+1);
1863 if (*handler) {
1864 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality);
1865 } else
1866 _info.handler = 0;
1867 } else {
1868 _info.lsda = 0;
1869 _info.handler = 0;
1870 }
1871 }
1872 #elif defined(_LIBUNWIND_TARGET_ARM)
1873 _info.end_ip = _info.start_ip + unwindEntry->FunctionLength;
1874 _info.lsda = 0; // FIXME
1875 _info.handler = 0; // FIXME
1876 #endif
1877 setLastPC(pc);
1878 return true;
1879 }
1880 #endif
1881
1882
1883 template <typename A, typename R>
setInfoBasedOnIPRegister(bool isReturnAddress)1884 void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
1885 pc_t pc = this->getIP();
1886 CHERI_DBG("%s(%d): pc=%#p\n", __func__, isReturnAddress, (void *)pc.get());
1887
1888 #if defined(_LIBUNWIND_ARM_EHABI)
1889 // Remove the thumb bit so the IP represents the actual instruction address.
1890 // This matches the behaviour of _Unwind_GetIP on arm.
1891 pc &= (pint_t)~0x1;
1892 #endif
1893
1894 // Exit early if at the top of the stack.
1895 if (pc.isNull()) {
1896 CHERI_DBG("%s(%d): return pc was NULL, stopping unwinding\n", __func__,
1897 isReturnAddress);
1898 // If the return address is zero that usually means that we have reached
1899 // the end of the thread's stack and can't continue unwinding
1900 _unwindInfoMissing = true;
1901 return;
1902 }
1903
1904 assert(pc.isValid() && "Loaded invalid $pcc");
1905
1906 // If the last line of a function is a "throw" the compiler sometimes
1907 // emits no instructions after the call to __cxa_throw. This means
1908 // the return address is actually the start of the next function.
1909 // To disambiguate this, back up the pc when we know it is a return
1910 // address.
1911 if (isReturnAddress)
1912 --pc;
1913
1914 // Ask address space object to find unwind sections for this pc.
1915 UnwindInfoSections sects;
1916 if (_addressSpace.findUnwindSections(pc, sects)) {
1917 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
1918 // If there is a compact unwind encoding table, look there first.
1919 if (sects.compact_unwind_section != 0) {
1920 if (this->getInfoFromCompactEncodingSection(pc, sects)) {
1921 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1922 // Found info in table, done unless encoding says to use dwarf.
1923 uint32_t dwarfOffset;
1924 if ((sects.dwarf_section() != 0) && compactSaysUseDwarf(&dwarfOffset)) {
1925 if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) {
1926 // found info in dwarf, done
1927 return;
1928 }
1929 }
1930 #endif
1931 // If unwind table has entry, but entry says there is no unwind info,
1932 // record that we have no unwind info.
1933 if (_info.format == 0)
1934 _unwindInfoMissing = true;
1935 return;
1936 }
1937 }
1938 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
1939
1940 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
1941 // If there is SEH unwind info, look there next.
1942 if (this->getInfoFromSEH(pc))
1943 return;
1944 #endif
1945
1946 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1947 // If there is dwarf unwind info, look there next.
1948 if (sects.dwarf_section() != 0) {
1949 if (this->getInfoFromDwarfSection(pc, sects)) {
1950 // found info in dwarf, done
1951 return;
1952 }
1953 }
1954 #endif
1955
1956 #if defined(_LIBUNWIND_ARM_EHABI)
1957 // If there is ARM EHABI unwind info, look there next.
1958 if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects))
1959 return;
1960 #endif
1961 }
1962
1963 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
1964 // There is no static unwind info for this pc. Look to see if an FDE was
1965 // dynamically registered for it.
1966 pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc.address());
1967 if (cachedFDE != 0) {
1968 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
1969 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
1970 const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace, pc, cachedFDE,
1971 &fdeInfo, &cieInfo);
1972 if (msg == NULL) {
1973 typename CFI_Parser<A>::PrologInfo prolog;
1974 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
1975 pc.address(), R::getArch(),
1976 &prolog)) {
1977 // save off parsed FDE info
1978 _info.start_ip = fdeInfo.pcStart;
1979 _info.end_ip = fdeInfo.pcEnd;
1980 _info.lsda = fdeInfo.lsda;
1981 _info.handler = cieInfo.personality;
1982 _info.gp = prolog.spExtraArgSize;
1983 // Some frameless functions need SP
1984 // altered when resuming in function.
1985 _info.flags = 0;
1986 _info.format = dwarfEncoding();
1987 _info.unwind_info = fdeInfo.fdeStart;
1988 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
1989 _info.extra = 0;
1990 return;
1991 }
1992 }
1993 }
1994
1995 // Lastly, ask AddressSpace object about platform specific ways to locate
1996 // other FDEs.
1997 pint_t fde;
1998 if (_addressSpace.findOtherFDE(pc.address(), fde)) {
1999 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
2000 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
2001 if (!CFI_Parser<A>::decodeFDE(_addressSpace, pc, fde, &fdeInfo, &cieInfo)) {
2002 // Double check this FDE is for a function that includes the pc.
2003 if ((fdeInfo.pcStart <= pc.address()) && (pc.address() < fdeInfo.pcEnd)) {
2004 typename CFI_Parser<A>::PrologInfo prolog;
2005 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
2006 pc.address(), R::getArch(),
2007 &prolog)) {
2008 // save off parsed FDE info
2009 _info.start_ip = fdeInfo.pcStart;
2010 _info.end_ip = fdeInfo.pcEnd;
2011 _info.lsda = fdeInfo.lsda;
2012 _info.handler = cieInfo.personality;
2013 _info.gp = prolog.spExtraArgSize;
2014 _info.flags = 0;
2015 _info.format = dwarfEncoding();
2016 _info.unwind_info = fdeInfo.fdeStart;
2017 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
2018 _info.extra = 0;
2019 return;
2020 }
2021 }
2022 }
2023 }
2024 #endif // #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
2025
2026 // no unwind info, flag that we can't reliably unwind
2027 _unwindInfoMissing = true;
2028 }
2029
2030 template <typename A, typename R>
step()2031 int UnwindCursor<A, R>::step() {
2032 // Bottom of stack is defined is when unwind info cannot be found.
2033 if (_unwindInfoMissing) {
2034 _LIBUNWIND_TRACE_UNWINDING("%s: _unwindInfoMissing -> UNW_STEP_END", __func__);
2035 return UNW_STEP_END;
2036 }
2037 // Use unwinding info to modify register set as if function returned.
2038 int result;
2039 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND)
2040 result = this->stepWithCompactEncoding();
2041 #elif defined(_LIBUNWIND_SUPPORT_SEH_UNWIND)
2042 result = this->stepWithSEHData();
2043 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND)
2044 result = this->stepWithDwarfFDE();
2045 #elif defined(_LIBUNWIND_ARM_EHABI)
2046 result = this->stepWithEHABI();
2047 #else
2048 #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \
2049 _LIBUNWIND_SUPPORT_SEH_UNWIND or \
2050 _LIBUNWIND_SUPPORT_DWARF_UNWIND or \
2051 _LIBUNWIND_ARM_EHABI
2052 #endif
2053
2054 // update info based on new PC
2055 if (result == UNW_STEP_SUCCESS) {
2056 this->setInfoBasedOnIPRegister(true);
2057 if (_unwindInfoMissing) {
2058 _LIBUNWIND_TRACE_UNWINDING("%s: step returned UNW_STEP_SUCCESS but "
2059 "_unwindInfoMissing -> UNW_STEP_END", __func__);
2060 return UNW_STEP_END;
2061 }
2062 }
2063 _LIBUNWIND_TRACE_UNWINDING("%s: result = %d", __func__, result);
2064 return result;
2065 }
2066
2067 template <typename A, typename R>
getInfo(unw_proc_info_t * info)2068 void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) {
2069 if (_unwindInfoMissing)
2070 memset(info, 0, sizeof(*info));
2071 else
2072 *info = _info;
2073 }
2074
2075 template <typename A, typename R>
getFunctionName(char * buf,size_t bufLen,size_t * offset)2076 bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen,
2077 size_t *offset) {
2078 return _addressSpace.findFunctionName(this->getIP(), buf, bufLen, offset);
2079 }
2080
2081 } // namespace libunwind
2082
2083 #endif // __UNWINDCURSOR_HPP__
2084