1 //===------------------------- UnwindCursor.hpp ---------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 // 9 // C++ interface to lower levels of libunwind 10 //===----------------------------------------------------------------------===// 11 12 #ifndef __UNWINDCURSOR_HPP__ 13 #define __UNWINDCURSOR_HPP__ 14 15 #include <algorithm> 16 #include <stdint.h> 17 #include <stdio.h> 18 #include <stdlib.h> 19 #include <unwind.h> 20 21 #ifdef _WIN32 22 #include <windows.h> 23 #include <ntverp.h> 24 #endif 25 #ifdef __APPLE__ 26 #include <mach-o/dyld.h> 27 #endif 28 29 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 30 // Provide a definition for the DISPATCHER_CONTEXT struct for old (Win7 and 31 // earlier) SDKs. 32 // MinGW-w64 has always provided this struct. 33 #if defined(_WIN32) && defined(_LIBUNWIND_TARGET_X86_64) && \ 34 !defined(__MINGW32__) && VER_PRODUCTBUILD < 8000 35 struct _DISPATCHER_CONTEXT { 36 ULONG64 ControlPc; 37 ULONG64 ImageBase; 38 PRUNTIME_FUNCTION FunctionEntry; 39 ULONG64 EstablisherFrame; 40 ULONG64 TargetIp; 41 PCONTEXT ContextRecord; 42 PEXCEPTION_ROUTINE LanguageHandler; 43 PVOID HandlerData; 44 PUNWIND_HISTORY_TABLE HistoryTable; 45 ULONG ScopeIndex; 46 ULONG Fill0; 47 }; 48 #endif 49 50 struct UNWIND_INFO { 51 uint8_t Version : 3; 52 uint8_t Flags : 5; 53 uint8_t SizeOfProlog; 54 uint8_t CountOfCodes; 55 uint8_t FrameRegister : 4; 56 uint8_t FrameOffset : 4; 57 uint16_t UnwindCodes[2]; 58 }; 59 60 extern "C" _Unwind_Reason_Code __libunwind_seh_personality( 61 int, _Unwind_Action, uint64_t, _Unwind_Exception *, 62 struct _Unwind_Context *); 63 64 #endif 65 66 #include "config.h" 67 68 #include "AddressSpace.hpp" 69 #include "CompactUnwinder.hpp" 70 #include "config.h" 71 #include "DwarfInstructions.hpp" 72 #include "EHHeaderParser.hpp" 73 #include "libunwind.h" 74 #include "Registers.hpp" 75 #include "RWMutex.hpp" 76 #include "Unwind-EHABI.h" 77 78 namespace libunwind { 79 80 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 81 /// Cache of recently found FDEs. 82 template <typename A> 83 class _LIBUNWIND_HIDDEN DwarfFDECache { 84 typedef typename A::pint_t pint_t; 85 public: 86 static pint_t findFDE(pint_t mh, pint_t pc); 87 static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde); 88 static void removeAllIn(pint_t mh); 89 static void iterateCacheEntries(void (*func)(unw_word_t ip_start, 90 unw_word_t ip_end, 91 unw_word_t fde, unw_word_t mh)); 92 93 private: 94 95 struct entry { 96 pint_t mh; 97 pint_t ip_start; 98 pint_t ip_end; 99 pint_t fde; 100 }; 101 102 // These fields are all static to avoid needing an initializer. 103 // There is only one instance of this class per process. 104 static RWMutex _lock; 105 #ifdef __APPLE__ 106 static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide); 107 static bool _registeredForDyldUnloads; 108 #endif 109 // Can't use std::vector<> here because this code is below libc++. 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> 140 typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, pint_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> 156 void DwarfFDECache<A>::add(pint_t mh, pint_t ip_start, pint_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 = mh; 173 _bufferUsed->ip_start = ip_start; 174 _bufferUsed->ip_end = ip_end; 175 _bufferUsed->fde = fde; 176 ++_bufferUsed; 177 #ifdef __APPLE__ 178 if (!_registeredForDyldUnloads) { 179 _dyld_register_func_for_remove_image(&dyldUnloadHook); 180 _registeredForDyldUnloads = true; 181 } 182 #endif 183 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 184 #endif 185 } 186 187 template <typename A> 188 void DwarfFDECache<A>::removeAllIn(pint_t mh) { 189 _LIBUNWIND_LOG_IF_FALSE(_lock.lock()); 190 entry *d = _buffer; 191 for (const entry *s = _buffer; s < _bufferUsed; ++s) { 192 if (s->mh != mh) { 193 if (d != s) 194 *d = *s; 195 ++d; 196 } 197 } 198 _bufferUsed = d; 199 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 200 } 201 202 #ifdef __APPLE__ 203 template <typename A> 204 void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) { 205 removeAllIn((pint_t) mh); 206 } 207 #endif 208 209 template <typename A> 210 void DwarfFDECache<A>::iterateCacheEntries(void (*func)( 211 unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) { 212 _LIBUNWIND_LOG_IF_FALSE(_lock.lock()); 213 for (entry *p = _buffer; p < _bufferUsed; ++p) { 214 (*func)(p->ip_start, p->ip_end, p->fde, p->mh); 215 } 216 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 217 } 218 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 219 220 221 #define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field)) 222 223 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 224 template <typename A> class UnwindSectionHeader { 225 public: 226 UnwindSectionHeader(A &addressSpace, typename A::pint_t addr) 227 : _addressSpace(addressSpace), _addr(addr) {} 228 229 uint32_t version() const { 230 return _addressSpace.get32(_addr + 231 offsetof(unwind_info_section_header, version)); 232 } 233 uint32_t commonEncodingsArraySectionOffset() const { 234 return _addressSpace.get32(_addr + 235 offsetof(unwind_info_section_header, 236 commonEncodingsArraySectionOffset)); 237 } 238 uint32_t commonEncodingsArrayCount() const { 239 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, 240 commonEncodingsArrayCount)); 241 } 242 uint32_t personalityArraySectionOffset() const { 243 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, 244 personalityArraySectionOffset)); 245 } 246 uint32_t personalityArrayCount() const { 247 return _addressSpace.get32( 248 _addr + offsetof(unwind_info_section_header, personalityArrayCount)); 249 } 250 uint32_t indexSectionOffset() const { 251 return _addressSpace.get32( 252 _addr + offsetof(unwind_info_section_header, indexSectionOffset)); 253 } 254 uint32_t indexCount() const { 255 return _addressSpace.get32( 256 _addr + offsetof(unwind_info_section_header, indexCount)); 257 } 258 259 private: 260 A &_addressSpace; 261 typename A::pint_t _addr; 262 }; 263 264 template <typename A> class UnwindSectionIndexArray { 265 public: 266 UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr) 267 : _addressSpace(addressSpace), _addr(addr) {} 268 269 uint32_t functionOffset(uint32_t index) const { 270 return _addressSpace.get32( 271 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 272 functionOffset)); 273 } 274 uint32_t secondLevelPagesSectionOffset(uint32_t index) const { 275 return _addressSpace.get32( 276 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 277 secondLevelPagesSectionOffset)); 278 } 279 uint32_t lsdaIndexArraySectionOffset(uint32_t index) const { 280 return _addressSpace.get32( 281 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 282 lsdaIndexArraySectionOffset)); 283 } 284 285 private: 286 A &_addressSpace; 287 typename A::pint_t _addr; 288 }; 289 290 template <typename A> class UnwindSectionRegularPageHeader { 291 public: 292 UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr) 293 : _addressSpace(addressSpace), _addr(addr) {} 294 295 uint32_t kind() const { 296 return _addressSpace.get32( 297 _addr + offsetof(unwind_info_regular_second_level_page_header, kind)); 298 } 299 uint16_t entryPageOffset() const { 300 return _addressSpace.get16( 301 _addr + offsetof(unwind_info_regular_second_level_page_header, 302 entryPageOffset)); 303 } 304 uint16_t entryCount() const { 305 return _addressSpace.get16( 306 _addr + 307 offsetof(unwind_info_regular_second_level_page_header, entryCount)); 308 } 309 310 private: 311 A &_addressSpace; 312 typename A::pint_t _addr; 313 }; 314 315 template <typename A> class UnwindSectionRegularArray { 316 public: 317 UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr) 318 : _addressSpace(addressSpace), _addr(addr) {} 319 320 uint32_t functionOffset(uint32_t index) const { 321 return _addressSpace.get32( 322 _addr + arrayoffsetof(unwind_info_regular_second_level_entry, index, 323 functionOffset)); 324 } 325 uint32_t encoding(uint32_t index) const { 326 return _addressSpace.get32( 327 _addr + 328 arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding)); 329 } 330 331 private: 332 A &_addressSpace; 333 typename A::pint_t _addr; 334 }; 335 336 template <typename A> class UnwindSectionCompressedPageHeader { 337 public: 338 UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr) 339 : _addressSpace(addressSpace), _addr(addr) {} 340 341 uint32_t kind() const { 342 return _addressSpace.get32( 343 _addr + 344 offsetof(unwind_info_compressed_second_level_page_header, kind)); 345 } 346 uint16_t entryPageOffset() const { 347 return _addressSpace.get16( 348 _addr + offsetof(unwind_info_compressed_second_level_page_header, 349 entryPageOffset)); 350 } 351 uint16_t entryCount() const { 352 return _addressSpace.get16( 353 _addr + 354 offsetof(unwind_info_compressed_second_level_page_header, entryCount)); 355 } 356 uint16_t encodingsPageOffset() const { 357 return _addressSpace.get16( 358 _addr + offsetof(unwind_info_compressed_second_level_page_header, 359 encodingsPageOffset)); 360 } 361 uint16_t encodingsCount() const { 362 return _addressSpace.get16( 363 _addr + offsetof(unwind_info_compressed_second_level_page_header, 364 encodingsCount)); 365 } 366 367 private: 368 A &_addressSpace; 369 typename A::pint_t _addr; 370 }; 371 372 template <typename A> class UnwindSectionCompressedArray { 373 public: 374 UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr) 375 : _addressSpace(addressSpace), _addr(addr) {} 376 377 uint32_t functionOffset(uint32_t index) const { 378 return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET( 379 _addressSpace.get32(_addr + index * sizeof(uint32_t))); 380 } 381 uint16_t encodingIndex(uint32_t index) const { 382 return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX( 383 _addressSpace.get32(_addr + index * sizeof(uint32_t))); 384 } 385 386 private: 387 A &_addressSpace; 388 typename A::pint_t _addr; 389 }; 390 391 template <typename A> class UnwindSectionLsdaArray { 392 public: 393 UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr) 394 : _addressSpace(addressSpace), _addr(addr) {} 395 396 uint32_t functionOffset(uint32_t index) const { 397 return _addressSpace.get32( 398 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, 399 index, functionOffset)); 400 } 401 uint32_t lsdaOffset(uint32_t index) const { 402 return _addressSpace.get32( 403 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, 404 index, lsdaOffset)); 405 } 406 407 private: 408 A &_addressSpace; 409 typename A::pint_t _addr; 410 }; 411 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 412 413 class _LIBUNWIND_HIDDEN AbstractUnwindCursor { 414 public: 415 // NOTE: provide a class specific placement deallocation function (S5.3.4 p20) 416 // This avoids an unnecessary dependency to libc++abi. 417 void operator delete(void *, size_t) {} 418 419 virtual ~AbstractUnwindCursor() {} 420 virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); } 421 virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); } 422 virtual void setReg(int, unw_word_t) { 423 _LIBUNWIND_ABORT("setReg not implemented"); 424 } 425 virtual bool validFloatReg(int) { 426 _LIBUNWIND_ABORT("validFloatReg not implemented"); 427 } 428 virtual unw_fpreg_t getFloatReg(int) { 429 _LIBUNWIND_ABORT("getFloatReg not implemented"); 430 } 431 virtual void setFloatReg(int, unw_fpreg_t) { 432 _LIBUNWIND_ABORT("setFloatReg not implemented"); 433 } 434 virtual int step() { _LIBUNWIND_ABORT("step not implemented"); } 435 virtual void getInfo(unw_proc_info_t *) { 436 _LIBUNWIND_ABORT("getInfo not implemented"); 437 } 438 virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); } 439 virtual bool isSignalFrame() { 440 _LIBUNWIND_ABORT("isSignalFrame not implemented"); 441 } 442 virtual bool getFunctionName(char *, size_t, unw_word_t *) { 443 _LIBUNWIND_ABORT("getFunctionName not implemented"); 444 } 445 virtual void setInfoBasedOnIPRegister(bool = false) { 446 _LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented"); 447 } 448 virtual const char *getRegisterName(int) { 449 _LIBUNWIND_ABORT("getRegisterName not implemented"); 450 } 451 #ifdef __arm__ 452 virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); } 453 #endif 454 }; 455 456 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32) 457 458 /// \c UnwindCursor contains all state (including all register values) during 459 /// an unwind. This is normally stack-allocated inside a unw_cursor_t. 460 template <typename A, typename R> 461 class UnwindCursor : public AbstractUnwindCursor { 462 typedef typename A::pint_t pint_t; 463 public: 464 UnwindCursor(unw_context_t *context, A &as); 465 UnwindCursor(CONTEXT *context, A &as); 466 UnwindCursor(A &as, void *threadArg); 467 virtual ~UnwindCursor() {} 468 virtual bool validReg(int); 469 virtual unw_word_t getReg(int); 470 virtual void setReg(int, unw_word_t); 471 virtual bool validFloatReg(int); 472 virtual unw_fpreg_t getFloatReg(int); 473 virtual void setFloatReg(int, unw_fpreg_t); 474 virtual int step(); 475 virtual void getInfo(unw_proc_info_t *); 476 virtual void jumpto(); 477 virtual bool isSignalFrame(); 478 virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off); 479 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false); 480 virtual const char *getRegisterName(int num); 481 #ifdef __arm__ 482 virtual void saveVFPAsX(); 483 #endif 484 485 DISPATCHER_CONTEXT *getDispatcherContext() { return &_dispContext; } 486 void setDispatcherContext(DISPATCHER_CONTEXT *disp) { _dispContext = *disp; } 487 488 private: 489 490 pint_t getLastPC() const { return _dispContext.ControlPc; } 491 void setLastPC(pint_t pc) { _dispContext.ControlPc = pc; } 492 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) { 493 _dispContext.FunctionEntry = RtlLookupFunctionEntry(pc, 494 &_dispContext.ImageBase, 495 _dispContext.HistoryTable); 496 *base = _dispContext.ImageBase; 497 return _dispContext.FunctionEntry; 498 } 499 bool getInfoFromSEH(pint_t pc); 500 int stepWithSEHData() { 501 _dispContext.LanguageHandler = RtlVirtualUnwind(UNW_FLAG_UHANDLER, 502 _dispContext.ImageBase, 503 _dispContext.ControlPc, 504 _dispContext.FunctionEntry, 505 _dispContext.ContextRecord, 506 &_dispContext.HandlerData, 507 &_dispContext.EstablisherFrame, 508 NULL); 509 // Update some fields of the unwind info now, since we have them. 510 _info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData); 511 if (_dispContext.LanguageHandler) { 512 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality); 513 } else 514 _info.handler = 0; 515 return UNW_STEP_SUCCESS; 516 } 517 518 A &_addressSpace; 519 unw_proc_info_t _info; 520 DISPATCHER_CONTEXT _dispContext; 521 CONTEXT _msContext; 522 UNWIND_HISTORY_TABLE _histTable; 523 bool _unwindInfoMissing; 524 }; 525 526 527 template <typename A, typename R> 528 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as) 529 : _addressSpace(as), _unwindInfoMissing(false) { 530 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 531 "UnwindCursor<> does not fit in unw_cursor_t"); 532 memset(&_info, 0, sizeof(_info)); 533 memset(&_histTable, 0, sizeof(_histTable)); 534 _dispContext.ContextRecord = &_msContext; 535 _dispContext.HistoryTable = &_histTable; 536 // Initialize MS context from ours. 537 R r(context); 538 _msContext.ContextFlags = CONTEXT_CONTROL|CONTEXT_INTEGER|CONTEXT_FLOATING_POINT; 539 #if defined(_LIBUNWIND_TARGET_X86_64) 540 _msContext.Rax = r.getRegister(UNW_X86_64_RAX); 541 _msContext.Rcx = r.getRegister(UNW_X86_64_RCX); 542 _msContext.Rdx = r.getRegister(UNW_X86_64_RDX); 543 _msContext.Rbx = r.getRegister(UNW_X86_64_RBX); 544 _msContext.Rsp = r.getRegister(UNW_X86_64_RSP); 545 _msContext.Rbp = r.getRegister(UNW_X86_64_RBP); 546 _msContext.Rsi = r.getRegister(UNW_X86_64_RSI); 547 _msContext.Rdi = r.getRegister(UNW_X86_64_RDI); 548 _msContext.R8 = r.getRegister(UNW_X86_64_R8); 549 _msContext.R9 = r.getRegister(UNW_X86_64_R9); 550 _msContext.R10 = r.getRegister(UNW_X86_64_R10); 551 _msContext.R11 = r.getRegister(UNW_X86_64_R11); 552 _msContext.R12 = r.getRegister(UNW_X86_64_R12); 553 _msContext.R13 = r.getRegister(UNW_X86_64_R13); 554 _msContext.R14 = r.getRegister(UNW_X86_64_R14); 555 _msContext.R15 = r.getRegister(UNW_X86_64_R15); 556 _msContext.Rip = r.getRegister(UNW_REG_IP); 557 union { 558 v128 v; 559 M128A m; 560 } t; 561 t.v = r.getVectorRegister(UNW_X86_64_XMM0); 562 _msContext.Xmm0 = t.m; 563 t.v = r.getVectorRegister(UNW_X86_64_XMM1); 564 _msContext.Xmm1 = t.m; 565 t.v = r.getVectorRegister(UNW_X86_64_XMM2); 566 _msContext.Xmm2 = t.m; 567 t.v = r.getVectorRegister(UNW_X86_64_XMM3); 568 _msContext.Xmm3 = t.m; 569 t.v = r.getVectorRegister(UNW_X86_64_XMM4); 570 _msContext.Xmm4 = t.m; 571 t.v = r.getVectorRegister(UNW_X86_64_XMM5); 572 _msContext.Xmm5 = t.m; 573 t.v = r.getVectorRegister(UNW_X86_64_XMM6); 574 _msContext.Xmm6 = t.m; 575 t.v = r.getVectorRegister(UNW_X86_64_XMM7); 576 _msContext.Xmm7 = t.m; 577 t.v = r.getVectorRegister(UNW_X86_64_XMM8); 578 _msContext.Xmm8 = t.m; 579 t.v = r.getVectorRegister(UNW_X86_64_XMM9); 580 _msContext.Xmm9 = t.m; 581 t.v = r.getVectorRegister(UNW_X86_64_XMM10); 582 _msContext.Xmm10 = t.m; 583 t.v = r.getVectorRegister(UNW_X86_64_XMM11); 584 _msContext.Xmm11 = t.m; 585 t.v = r.getVectorRegister(UNW_X86_64_XMM12); 586 _msContext.Xmm12 = t.m; 587 t.v = r.getVectorRegister(UNW_X86_64_XMM13); 588 _msContext.Xmm13 = t.m; 589 t.v = r.getVectorRegister(UNW_X86_64_XMM14); 590 _msContext.Xmm14 = t.m; 591 t.v = r.getVectorRegister(UNW_X86_64_XMM15); 592 _msContext.Xmm15 = t.m; 593 #elif defined(_LIBUNWIND_TARGET_ARM) 594 _msContext.R0 = r.getRegister(UNW_ARM_R0); 595 _msContext.R1 = r.getRegister(UNW_ARM_R1); 596 _msContext.R2 = r.getRegister(UNW_ARM_R2); 597 _msContext.R3 = r.getRegister(UNW_ARM_R3); 598 _msContext.R4 = r.getRegister(UNW_ARM_R4); 599 _msContext.R5 = r.getRegister(UNW_ARM_R5); 600 _msContext.R6 = r.getRegister(UNW_ARM_R6); 601 _msContext.R7 = r.getRegister(UNW_ARM_R7); 602 _msContext.R8 = r.getRegister(UNW_ARM_R8); 603 _msContext.R9 = r.getRegister(UNW_ARM_R9); 604 _msContext.R10 = r.getRegister(UNW_ARM_R10); 605 _msContext.R11 = r.getRegister(UNW_ARM_R11); 606 _msContext.R12 = r.getRegister(UNW_ARM_R12); 607 _msContext.Sp = r.getRegister(UNW_ARM_SP); 608 _msContext.Lr = r.getRegister(UNW_ARM_LR); 609 _msContext.Pc = r.getRegister(UNW_ARM_IP); 610 for (int i = UNW_ARM_D0; i <= UNW_ARM_D31; ++i) { 611 union { 612 uint64_t w; 613 double d; 614 } d; 615 d.d = r.getFloatRegister(i); 616 _msContext.D[i - UNW_ARM_D0] = d.w; 617 } 618 #endif 619 } 620 621 template <typename A, typename R> 622 UnwindCursor<A, R>::UnwindCursor(CONTEXT *context, A &as) 623 : _addressSpace(as), _unwindInfoMissing(false) { 624 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 625 "UnwindCursor<> does not fit in unw_cursor_t"); 626 memset(&_info, 0, sizeof(_info)); 627 memset(&_histTable, 0, sizeof(_histTable)); 628 _dispContext.ContextRecord = &_msContext; 629 _dispContext.HistoryTable = &_histTable; 630 _msContext = *context; 631 } 632 633 634 template <typename A, typename R> 635 bool UnwindCursor<A, R>::validReg(int regNum) { 636 if (regNum == UNW_REG_IP || regNum == UNW_REG_SP) return true; 637 #if defined(_LIBUNWIND_TARGET_X86_64) 638 if (regNum >= UNW_X86_64_RAX && regNum <= UNW_X86_64_R15) return true; 639 #elif defined(_LIBUNWIND_TARGET_ARM) 640 if (regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15) return true; 641 #endif 642 return false; 643 } 644 645 template <typename A, typename R> 646 unw_word_t UnwindCursor<A, R>::getReg(int regNum) { 647 switch (regNum) { 648 #if defined(_LIBUNWIND_TARGET_X86_64) 649 case UNW_REG_IP: return _msContext.Rip; 650 case UNW_X86_64_RAX: return _msContext.Rax; 651 case UNW_X86_64_RDX: return _msContext.Rdx; 652 case UNW_X86_64_RCX: return _msContext.Rcx; 653 case UNW_X86_64_RBX: return _msContext.Rbx; 654 case UNW_REG_SP: 655 case UNW_X86_64_RSP: return _msContext.Rsp; 656 case UNW_X86_64_RBP: return _msContext.Rbp; 657 case UNW_X86_64_RSI: return _msContext.Rsi; 658 case UNW_X86_64_RDI: return _msContext.Rdi; 659 case UNW_X86_64_R8: return _msContext.R8; 660 case UNW_X86_64_R9: return _msContext.R9; 661 case UNW_X86_64_R10: return _msContext.R10; 662 case UNW_X86_64_R11: return _msContext.R11; 663 case UNW_X86_64_R12: return _msContext.R12; 664 case UNW_X86_64_R13: return _msContext.R13; 665 case UNW_X86_64_R14: return _msContext.R14; 666 case UNW_X86_64_R15: return _msContext.R15; 667 #elif defined(_LIBUNWIND_TARGET_ARM) 668 case UNW_ARM_R0: return _msContext.R0; 669 case UNW_ARM_R1: return _msContext.R1; 670 case UNW_ARM_R2: return _msContext.R2; 671 case UNW_ARM_R3: return _msContext.R3; 672 case UNW_ARM_R4: return _msContext.R4; 673 case UNW_ARM_R5: return _msContext.R5; 674 case UNW_ARM_R6: return _msContext.R6; 675 case UNW_ARM_R7: return _msContext.R7; 676 case UNW_ARM_R8: return _msContext.R8; 677 case UNW_ARM_R9: return _msContext.R9; 678 case UNW_ARM_R10: return _msContext.R10; 679 case UNW_ARM_R11: return _msContext.R11; 680 case UNW_ARM_R12: return _msContext.R12; 681 case UNW_REG_SP: 682 case UNW_ARM_SP: return _msContext.Sp; 683 case UNW_ARM_LR: return _msContext.Lr; 684 case UNW_REG_IP: 685 case UNW_ARM_IP: return _msContext.Pc; 686 #endif 687 } 688 _LIBUNWIND_ABORT("unsupported register"); 689 } 690 691 template <typename A, typename R> 692 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) { 693 switch (regNum) { 694 #if defined(_LIBUNWIND_TARGET_X86_64) 695 case UNW_REG_IP: _msContext.Rip = value; break; 696 case UNW_X86_64_RAX: _msContext.Rax = value; break; 697 case UNW_X86_64_RDX: _msContext.Rdx = value; break; 698 case UNW_X86_64_RCX: _msContext.Rcx = value; break; 699 case UNW_X86_64_RBX: _msContext.Rbx = value; break; 700 case UNW_REG_SP: 701 case UNW_X86_64_RSP: _msContext.Rsp = value; break; 702 case UNW_X86_64_RBP: _msContext.Rbp = value; break; 703 case UNW_X86_64_RSI: _msContext.Rsi = value; break; 704 case UNW_X86_64_RDI: _msContext.Rdi = value; break; 705 case UNW_X86_64_R8: _msContext.R8 = value; break; 706 case UNW_X86_64_R9: _msContext.R9 = value; break; 707 case UNW_X86_64_R10: _msContext.R10 = value; break; 708 case UNW_X86_64_R11: _msContext.R11 = value; break; 709 case UNW_X86_64_R12: _msContext.R12 = value; break; 710 case UNW_X86_64_R13: _msContext.R13 = value; break; 711 case UNW_X86_64_R14: _msContext.R14 = value; break; 712 case UNW_X86_64_R15: _msContext.R15 = value; break; 713 #elif defined(_LIBUNWIND_TARGET_ARM) 714 case UNW_ARM_R0: _msContext.R0 = value; break; 715 case UNW_ARM_R1: _msContext.R1 = value; break; 716 case UNW_ARM_R2: _msContext.R2 = value; break; 717 case UNW_ARM_R3: _msContext.R3 = value; break; 718 case UNW_ARM_R4: _msContext.R4 = value; break; 719 case UNW_ARM_R5: _msContext.R5 = value; break; 720 case UNW_ARM_R6: _msContext.R6 = value; break; 721 case UNW_ARM_R7: _msContext.R7 = value; break; 722 case UNW_ARM_R8: _msContext.R8 = value; break; 723 case UNW_ARM_R9: _msContext.R9 = value; break; 724 case UNW_ARM_R10: _msContext.R10 = value; break; 725 case UNW_ARM_R11: _msContext.R11 = value; break; 726 case UNW_ARM_R12: _msContext.R12 = value; break; 727 case UNW_REG_SP: 728 case UNW_ARM_SP: _msContext.Sp = value; break; 729 case UNW_ARM_LR: _msContext.Lr = value; break; 730 case UNW_REG_IP: 731 case UNW_ARM_IP: _msContext.Pc = value; break; 732 #endif 733 default: 734 _LIBUNWIND_ABORT("unsupported register"); 735 } 736 } 737 738 template <typename A, typename R> 739 bool UnwindCursor<A, R>::validFloatReg(int regNum) { 740 #if defined(_LIBUNWIND_TARGET_ARM) 741 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) return true; 742 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) return true; 743 #endif 744 return false; 745 } 746 747 template <typename A, typename R> 748 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) { 749 #if defined(_LIBUNWIND_TARGET_ARM) 750 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) { 751 union { 752 uint32_t w; 753 float f; 754 } d; 755 d.w = _msContext.S[regNum - UNW_ARM_S0]; 756 return d.f; 757 } 758 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) { 759 union { 760 uint64_t w; 761 double d; 762 } d; 763 d.w = _msContext.D[regNum - UNW_ARM_D0]; 764 return d.d; 765 } 766 _LIBUNWIND_ABORT("unsupported float register"); 767 #else 768 _LIBUNWIND_ABORT("float registers unimplemented"); 769 #endif 770 } 771 772 template <typename A, typename R> 773 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) { 774 #if defined(_LIBUNWIND_TARGET_ARM) 775 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) { 776 union { 777 uint32_t w; 778 float f; 779 } d; 780 d.f = value; 781 _msContext.S[regNum - UNW_ARM_S0] = d.w; 782 } 783 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) { 784 union { 785 uint64_t w; 786 double d; 787 } d; 788 d.d = value; 789 _msContext.D[regNum - UNW_ARM_D0] = d.w; 790 } 791 _LIBUNWIND_ABORT("unsupported float register"); 792 #else 793 _LIBUNWIND_ABORT("float registers unimplemented"); 794 #endif 795 } 796 797 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() { 798 RtlRestoreContext(&_msContext, nullptr); 799 } 800 801 #ifdef __arm__ 802 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {} 803 #endif 804 805 template <typename A, typename R> 806 const char *UnwindCursor<A, R>::getRegisterName(int regNum) { 807 switch (regNum) { 808 #if defined(_LIBUNWIND_TARGET_X86_64) 809 case UNW_REG_IP: return "rip"; 810 case UNW_X86_64_RAX: return "rax"; 811 case UNW_X86_64_RDX: return "rdx"; 812 case UNW_X86_64_RCX: return "rcx"; 813 case UNW_X86_64_RBX: return "rbx"; 814 case UNW_REG_SP: 815 case UNW_X86_64_RSP: return "rsp"; 816 case UNW_X86_64_RBP: return "rbp"; 817 case UNW_X86_64_RSI: return "rsi"; 818 case UNW_X86_64_RDI: return "rdi"; 819 case UNW_X86_64_R8: return "r8"; 820 case UNW_X86_64_R9: return "r9"; 821 case UNW_X86_64_R10: return "r10"; 822 case UNW_X86_64_R11: return "r11"; 823 case UNW_X86_64_R12: return "r12"; 824 case UNW_X86_64_R13: return "r13"; 825 case UNW_X86_64_R14: return "r14"; 826 case UNW_X86_64_R15: return "r15"; 827 #elif defined(_LIBUNWIND_TARGET_ARM) 828 case UNW_ARM_R0: return "r0"; 829 case UNW_ARM_R1: return "r1"; 830 case UNW_ARM_R2: return "r2"; 831 case UNW_ARM_R3: return "r3"; 832 case UNW_ARM_R4: return "r4"; 833 case UNW_ARM_R5: return "r5"; 834 case UNW_ARM_R6: return "r6"; 835 case UNW_ARM_R7: return "r7"; 836 case UNW_ARM_R8: return "r8"; 837 case UNW_ARM_R9: return "r9"; 838 case UNW_ARM_R10: return "r10"; 839 case UNW_ARM_R11: return "r11"; 840 case UNW_ARM_R12: return "r12"; 841 case UNW_REG_SP: 842 case UNW_ARM_SP: return "sp"; 843 case UNW_ARM_LR: return "lr"; 844 case UNW_REG_IP: 845 case UNW_ARM_IP: return "pc"; 846 case UNW_ARM_S0: return "s0"; 847 case UNW_ARM_S1: return "s1"; 848 case UNW_ARM_S2: return "s2"; 849 case UNW_ARM_S3: return "s3"; 850 case UNW_ARM_S4: return "s4"; 851 case UNW_ARM_S5: return "s5"; 852 case UNW_ARM_S6: return "s6"; 853 case UNW_ARM_S7: return "s7"; 854 case UNW_ARM_S8: return "s8"; 855 case UNW_ARM_S9: return "s9"; 856 case UNW_ARM_S10: return "s10"; 857 case UNW_ARM_S11: return "s11"; 858 case UNW_ARM_S12: return "s12"; 859 case UNW_ARM_S13: return "s13"; 860 case UNW_ARM_S14: return "s14"; 861 case UNW_ARM_S15: return "s15"; 862 case UNW_ARM_S16: return "s16"; 863 case UNW_ARM_S17: return "s17"; 864 case UNW_ARM_S18: return "s18"; 865 case UNW_ARM_S19: return "s19"; 866 case UNW_ARM_S20: return "s20"; 867 case UNW_ARM_S21: return "s21"; 868 case UNW_ARM_S22: return "s22"; 869 case UNW_ARM_S23: return "s23"; 870 case UNW_ARM_S24: return "s24"; 871 case UNW_ARM_S25: return "s25"; 872 case UNW_ARM_S26: return "s26"; 873 case UNW_ARM_S27: return "s27"; 874 case UNW_ARM_S28: return "s28"; 875 case UNW_ARM_S29: return "s29"; 876 case UNW_ARM_S30: return "s30"; 877 case UNW_ARM_S31: return "s31"; 878 case UNW_ARM_D0: return "d0"; 879 case UNW_ARM_D1: return "d1"; 880 case UNW_ARM_D2: return "d2"; 881 case UNW_ARM_D3: return "d3"; 882 case UNW_ARM_D4: return "d4"; 883 case UNW_ARM_D5: return "d5"; 884 case UNW_ARM_D6: return "d6"; 885 case UNW_ARM_D7: return "d7"; 886 case UNW_ARM_D8: return "d8"; 887 case UNW_ARM_D9: return "d9"; 888 case UNW_ARM_D10: return "d10"; 889 case UNW_ARM_D11: return "d11"; 890 case UNW_ARM_D12: return "d12"; 891 case UNW_ARM_D13: return "d13"; 892 case UNW_ARM_D14: return "d14"; 893 case UNW_ARM_D15: return "d15"; 894 case UNW_ARM_D16: return "d16"; 895 case UNW_ARM_D17: return "d17"; 896 case UNW_ARM_D18: return "d18"; 897 case UNW_ARM_D19: return "d19"; 898 case UNW_ARM_D20: return "d20"; 899 case UNW_ARM_D21: return "d21"; 900 case UNW_ARM_D22: return "d22"; 901 case UNW_ARM_D23: return "d23"; 902 case UNW_ARM_D24: return "d24"; 903 case UNW_ARM_D25: return "d25"; 904 case UNW_ARM_D26: return "d26"; 905 case UNW_ARM_D27: return "d27"; 906 case UNW_ARM_D28: return "d28"; 907 case UNW_ARM_D29: return "d29"; 908 case UNW_ARM_D30: return "d30"; 909 case UNW_ARM_D31: return "d31"; 910 #endif 911 default: 912 _LIBUNWIND_ABORT("unsupported register"); 913 } 914 } 915 916 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() { 917 return false; 918 } 919 920 #else // !defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) || !defined(_WIN32) 921 922 /// UnwindCursor contains all state (including all register values) during 923 /// an unwind. This is normally stack allocated inside a unw_cursor_t. 924 template <typename A, typename R> 925 class UnwindCursor : public AbstractUnwindCursor{ 926 typedef typename A::pint_t pint_t; 927 public: 928 UnwindCursor(unw_context_t *context, A &as); 929 UnwindCursor(A &as, void *threadArg); 930 virtual ~UnwindCursor() {} 931 virtual bool validReg(int); 932 virtual unw_word_t getReg(int); 933 virtual void setReg(int, unw_word_t); 934 virtual bool validFloatReg(int); 935 virtual unw_fpreg_t getFloatReg(int); 936 virtual void setFloatReg(int, unw_fpreg_t); 937 virtual int step(); 938 virtual void getInfo(unw_proc_info_t *); 939 virtual void jumpto(); 940 virtual bool isSignalFrame(); 941 virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off); 942 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false); 943 virtual const char *getRegisterName(int num); 944 #ifdef __arm__ 945 virtual void saveVFPAsX(); 946 #endif 947 948 private: 949 950 #if defined(_LIBUNWIND_ARM_EHABI) 951 bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections §s); 952 953 int stepWithEHABI() { 954 size_t len = 0; 955 size_t off = 0; 956 // FIXME: Calling decode_eht_entry() here is violating the libunwind 957 // abstraction layer. 958 const uint32_t *ehtp = 959 decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info), 960 &off, &len); 961 if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) != 962 _URC_CONTINUE_UNWIND) 963 return UNW_STEP_END; 964 return UNW_STEP_SUCCESS; 965 } 966 #endif 967 968 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 969 bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections §s, 970 uint32_t fdeSectionOffsetHint=0); 971 int stepWithDwarfFDE() { 972 return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace, 973 (pint_t)this->getReg(UNW_REG_IP), 974 (pint_t)_info.unwind_info, 975 _registers); 976 } 977 #endif 978 979 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 980 bool getInfoFromCompactEncodingSection(pint_t pc, 981 const UnwindInfoSections §s); 982 int stepWithCompactEncoding() { 983 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 984 if ( compactSaysUseDwarf() ) 985 return stepWithDwarfFDE(); 986 #endif 987 R dummy; 988 return stepWithCompactEncoding(dummy); 989 } 990 991 #if defined(_LIBUNWIND_TARGET_X86_64) 992 int stepWithCompactEncoding(Registers_x86_64 &) { 993 return CompactUnwinder_x86_64<A>::stepWithCompactEncoding( 994 _info.format, _info.start_ip, _addressSpace, _registers); 995 } 996 #endif 997 998 #if defined(_LIBUNWIND_TARGET_I386) 999 int stepWithCompactEncoding(Registers_x86 &) { 1000 return CompactUnwinder_x86<A>::stepWithCompactEncoding( 1001 _info.format, (uint32_t)_info.start_ip, _addressSpace, _registers); 1002 } 1003 #endif 1004 1005 #if defined(_LIBUNWIND_TARGET_PPC) 1006 int stepWithCompactEncoding(Registers_ppc &) { 1007 return UNW_EINVAL; 1008 } 1009 #endif 1010 1011 #if defined(_LIBUNWIND_TARGET_PPC64) 1012 int stepWithCompactEncoding(Registers_ppc64 &) { 1013 return UNW_EINVAL; 1014 } 1015 #endif 1016 1017 1018 #if defined(_LIBUNWIND_TARGET_AARCH64) 1019 int stepWithCompactEncoding(Registers_arm64 &) { 1020 return CompactUnwinder_arm64<A>::stepWithCompactEncoding( 1021 _info.format, _info.start_ip, _addressSpace, _registers); 1022 } 1023 #endif 1024 1025 #if defined(_LIBUNWIND_TARGET_MIPS_O32) 1026 int stepWithCompactEncoding(Registers_mips_o32 &) { 1027 return UNW_EINVAL; 1028 } 1029 #endif 1030 1031 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI) 1032 int stepWithCompactEncoding(Registers_mips_newabi &) { 1033 return UNW_EINVAL; 1034 } 1035 #endif 1036 1037 bool compactSaysUseDwarf(uint32_t *offset=NULL) const { 1038 R dummy; 1039 return compactSaysUseDwarf(dummy, offset); 1040 } 1041 1042 #if defined(_LIBUNWIND_TARGET_X86_64) 1043 bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const { 1044 if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) { 1045 if (offset) 1046 *offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET); 1047 return true; 1048 } 1049 return false; 1050 } 1051 #endif 1052 1053 #if defined(_LIBUNWIND_TARGET_I386) 1054 bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const { 1055 if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) { 1056 if (offset) 1057 *offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET); 1058 return true; 1059 } 1060 return false; 1061 } 1062 #endif 1063 1064 #if defined(_LIBUNWIND_TARGET_PPC) 1065 bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const { 1066 return true; 1067 } 1068 #endif 1069 1070 #if defined(_LIBUNWIND_TARGET_PPC64) 1071 bool compactSaysUseDwarf(Registers_ppc64 &, uint32_t *) const { 1072 return true; 1073 } 1074 #endif 1075 1076 #if defined(_LIBUNWIND_TARGET_AARCH64) 1077 bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const { 1078 if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) { 1079 if (offset) 1080 *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET); 1081 return true; 1082 } 1083 return false; 1084 } 1085 #endif 1086 1087 #if defined(_LIBUNWIND_TARGET_MIPS_O32) 1088 bool compactSaysUseDwarf(Registers_mips_o32 &, uint32_t *) const { 1089 return true; 1090 } 1091 #endif 1092 1093 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI) 1094 bool compactSaysUseDwarf(Registers_mips_newabi &, uint32_t *) const { 1095 return true; 1096 } 1097 #endif 1098 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1099 1100 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1101 compact_unwind_encoding_t dwarfEncoding() const { 1102 R dummy; 1103 return dwarfEncoding(dummy); 1104 } 1105 1106 #if defined(_LIBUNWIND_TARGET_X86_64) 1107 compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const { 1108 return UNWIND_X86_64_MODE_DWARF; 1109 } 1110 #endif 1111 1112 #if defined(_LIBUNWIND_TARGET_I386) 1113 compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const { 1114 return UNWIND_X86_MODE_DWARF; 1115 } 1116 #endif 1117 1118 #if defined(_LIBUNWIND_TARGET_PPC) 1119 compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const { 1120 return 0; 1121 } 1122 #endif 1123 1124 #if defined(_LIBUNWIND_TARGET_PPC64) 1125 compact_unwind_encoding_t dwarfEncoding(Registers_ppc64 &) const { 1126 return 0; 1127 } 1128 #endif 1129 1130 #if defined(_LIBUNWIND_TARGET_AARCH64) 1131 compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const { 1132 return UNWIND_ARM64_MODE_DWARF; 1133 } 1134 #endif 1135 1136 #if defined(_LIBUNWIND_TARGET_ARM) 1137 compact_unwind_encoding_t dwarfEncoding(Registers_arm &) const { 1138 return 0; 1139 } 1140 #endif 1141 1142 #if defined (_LIBUNWIND_TARGET_OR1K) 1143 compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const { 1144 return 0; 1145 } 1146 #endif 1147 1148 #if defined (_LIBUNWIND_TARGET_MIPS_O32) 1149 compact_unwind_encoding_t dwarfEncoding(Registers_mips_o32 &) const { 1150 return 0; 1151 } 1152 #endif 1153 1154 #if defined (_LIBUNWIND_TARGET_MIPS_NEWABI) 1155 compact_unwind_encoding_t dwarfEncoding(Registers_mips_newabi &) const { 1156 return 0; 1157 } 1158 #endif 1159 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1160 1161 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1162 // For runtime environments using SEH unwind data without Windows runtime 1163 // support. 1164 pint_t getLastPC() const { /* FIXME: Implement */ return 0; } 1165 void setLastPC(pint_t pc) { /* FIXME: Implement */ } 1166 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) { 1167 /* FIXME: Implement */ 1168 *base = 0; 1169 return nullptr; 1170 } 1171 bool getInfoFromSEH(pint_t pc); 1172 int stepWithSEHData() { /* FIXME: Implement */ return 0; } 1173 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1174 1175 1176 A &_addressSpace; 1177 R _registers; 1178 unw_proc_info_t _info; 1179 bool _unwindInfoMissing; 1180 bool _isSignalFrame; 1181 }; 1182 1183 1184 template <typename A, typename R> 1185 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as) 1186 : _addressSpace(as), _registers(context), _unwindInfoMissing(false), 1187 _isSignalFrame(false) { 1188 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 1189 "UnwindCursor<> does not fit in unw_cursor_t"); 1190 memset(&_info, 0, sizeof(_info)); 1191 } 1192 1193 template <typename A, typename R> 1194 UnwindCursor<A, R>::UnwindCursor(A &as, void *) 1195 : _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) { 1196 memset(&_info, 0, sizeof(_info)); 1197 // FIXME 1198 // fill in _registers from thread arg 1199 } 1200 1201 1202 template <typename A, typename R> 1203 bool UnwindCursor<A, R>::validReg(int regNum) { 1204 return _registers.validRegister(regNum); 1205 } 1206 1207 template <typename A, typename R> 1208 unw_word_t UnwindCursor<A, R>::getReg(int regNum) { 1209 return _registers.getRegister(regNum); 1210 } 1211 1212 template <typename A, typename R> 1213 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) { 1214 _registers.setRegister(regNum, (typename A::pint_t)value); 1215 } 1216 1217 template <typename A, typename R> 1218 bool UnwindCursor<A, R>::validFloatReg(int regNum) { 1219 return _registers.validFloatRegister(regNum); 1220 } 1221 1222 template <typename A, typename R> 1223 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) { 1224 return _registers.getFloatRegister(regNum); 1225 } 1226 1227 template <typename A, typename R> 1228 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) { 1229 _registers.setFloatRegister(regNum, value); 1230 } 1231 1232 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() { 1233 _registers.jumpto(); 1234 } 1235 1236 #ifdef __arm__ 1237 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() { 1238 _registers.saveVFPAsX(); 1239 } 1240 #endif 1241 1242 template <typename A, typename R> 1243 const char *UnwindCursor<A, R>::getRegisterName(int regNum) { 1244 return _registers.getRegisterName(regNum); 1245 } 1246 1247 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() { 1248 return _isSignalFrame; 1249 } 1250 1251 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1252 1253 #if defined(_LIBUNWIND_ARM_EHABI) 1254 struct EHABIIndexEntry { 1255 uint32_t functionOffset; 1256 uint32_t data; 1257 }; 1258 1259 template<typename A> 1260 struct EHABISectionIterator { 1261 typedef EHABISectionIterator _Self; 1262 1263 typedef std::random_access_iterator_tag iterator_category; 1264 typedef typename A::pint_t value_type; 1265 typedef typename A::pint_t* pointer; 1266 typedef typename A::pint_t& reference; 1267 typedef size_t size_type; 1268 typedef size_t difference_type; 1269 1270 static _Self begin(A& addressSpace, const UnwindInfoSections& sects) { 1271 return _Self(addressSpace, sects, 0); 1272 } 1273 static _Self end(A& addressSpace, const UnwindInfoSections& sects) { 1274 return _Self(addressSpace, sects, 1275 sects.arm_section_length / sizeof(EHABIIndexEntry)); 1276 } 1277 1278 EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i) 1279 : _i(i), _addressSpace(&addressSpace), _sects(§s) {} 1280 1281 _Self& operator++() { ++_i; return *this; } 1282 _Self& operator+=(size_t a) { _i += a; return *this; } 1283 _Self& operator--() { assert(_i > 0); --_i; return *this; } 1284 _Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; } 1285 1286 _Self operator+(size_t a) { _Self out = *this; out._i += a; return out; } 1287 _Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; } 1288 1289 size_t operator-(const _Self& other) { return _i - other._i; } 1290 1291 bool operator==(const _Self& other) const { 1292 assert(_addressSpace == other._addressSpace); 1293 assert(_sects == other._sects); 1294 return _i == other._i; 1295 } 1296 1297 typename A::pint_t operator*() const { return functionAddress(); } 1298 1299 typename A::pint_t functionAddress() const { 1300 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( 1301 EHABIIndexEntry, _i, functionOffset); 1302 return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr)); 1303 } 1304 1305 typename A::pint_t dataAddress() { 1306 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( 1307 EHABIIndexEntry, _i, data); 1308 return indexAddr; 1309 } 1310 1311 private: 1312 size_t _i; 1313 A* _addressSpace; 1314 const UnwindInfoSections* _sects; 1315 }; 1316 1317 template <typename A, typename R> 1318 bool UnwindCursor<A, R>::getInfoFromEHABISection( 1319 pint_t pc, 1320 const UnwindInfoSections §s) { 1321 EHABISectionIterator<A> begin = 1322 EHABISectionIterator<A>::begin(_addressSpace, sects); 1323 EHABISectionIterator<A> end = 1324 EHABISectionIterator<A>::end(_addressSpace, sects); 1325 if (begin == end) 1326 return false; 1327 1328 EHABISectionIterator<A> itNextPC = std::upper_bound(begin, end, pc); 1329 if (itNextPC == begin) 1330 return false; 1331 EHABISectionIterator<A> itThisPC = itNextPC - 1; 1332 1333 pint_t thisPC = itThisPC.functionAddress(); 1334 // If an exception is thrown from a function, corresponding to the last entry 1335 // in the table, we don't really know the function extent and have to choose a 1336 // value for nextPC. Choosing max() will allow the range check during trace to 1337 // succeed. 1338 pint_t nextPC = (itNextPC == end) ? std::numeric_limits<pint_t>::max() 1339 : itNextPC.functionAddress(); 1340 pint_t indexDataAddr = itThisPC.dataAddress(); 1341 1342 if (indexDataAddr == 0) 1343 return false; 1344 1345 uint32_t indexData = _addressSpace.get32(indexDataAddr); 1346 if (indexData == UNW_EXIDX_CANTUNWIND) 1347 return false; 1348 1349 // If the high bit is set, the exception handling table entry is inline inside 1350 // the index table entry on the second word (aka |indexDataAddr|). Otherwise, 1351 // the table points at an offset in the exception handling table (section 5 EHABI). 1352 pint_t exceptionTableAddr; 1353 uint32_t exceptionTableData; 1354 bool isSingleWordEHT; 1355 if (indexData & 0x80000000) { 1356 exceptionTableAddr = indexDataAddr; 1357 // TODO(ajwong): Should this data be 0? 1358 exceptionTableData = indexData; 1359 isSingleWordEHT = true; 1360 } else { 1361 exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData); 1362 exceptionTableData = _addressSpace.get32(exceptionTableAddr); 1363 isSingleWordEHT = false; 1364 } 1365 1366 // Now we know the 3 things: 1367 // exceptionTableAddr -- exception handler table entry. 1368 // exceptionTableData -- the data inside the first word of the eht entry. 1369 // isSingleWordEHT -- whether the entry is in the index. 1370 unw_word_t personalityRoutine = 0xbadf00d; 1371 bool scope32 = false; 1372 uintptr_t lsda; 1373 1374 // If the high bit in the exception handling table entry is set, the entry is 1375 // in compact form (section 6.3 EHABI). 1376 if (exceptionTableData & 0x80000000) { 1377 // Grab the index of the personality routine from the compact form. 1378 uint32_t choice = (exceptionTableData & 0x0f000000) >> 24; 1379 uint32_t extraWords = 0; 1380 switch (choice) { 1381 case 0: 1382 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0; 1383 extraWords = 0; 1384 scope32 = false; 1385 lsda = isSingleWordEHT ? 0 : (exceptionTableAddr + 4); 1386 break; 1387 case 1: 1388 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1; 1389 extraWords = (exceptionTableData & 0x00ff0000) >> 16; 1390 scope32 = false; 1391 lsda = exceptionTableAddr + (extraWords + 1) * 4; 1392 break; 1393 case 2: 1394 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2; 1395 extraWords = (exceptionTableData & 0x00ff0000) >> 16; 1396 scope32 = true; 1397 lsda = exceptionTableAddr + (extraWords + 1) * 4; 1398 break; 1399 default: 1400 _LIBUNWIND_ABORT("unknown personality routine"); 1401 return false; 1402 } 1403 1404 if (isSingleWordEHT) { 1405 if (extraWords != 0) { 1406 _LIBUNWIND_ABORT("index inlined table detected but pr function " 1407 "requires extra words"); 1408 return false; 1409 } 1410 } 1411 } else { 1412 pint_t personalityAddr = 1413 exceptionTableAddr + signExtendPrel31(exceptionTableData); 1414 personalityRoutine = personalityAddr; 1415 1416 // ARM EHABI # 6.2, # 9.2 1417 // 1418 // +---- ehtp 1419 // v 1420 // +--------------------------------------+ 1421 // | +--------+--------+--------+-------+ | 1422 // | |0| prel31 to personalityRoutine | | 1423 // | +--------+--------+--------+-------+ | 1424 // | | N | unwind opcodes | | <-- UnwindData 1425 // | +--------+--------+--------+-------+ | 1426 // | | Word 2 unwind opcodes | | 1427 // | +--------+--------+--------+-------+ | 1428 // | ... | 1429 // | +--------+--------+--------+-------+ | 1430 // | | Word N unwind opcodes | | 1431 // | +--------+--------+--------+-------+ | 1432 // | | LSDA | | <-- lsda 1433 // | | ... | | 1434 // | +--------+--------+--------+-------+ | 1435 // +--------------------------------------+ 1436 1437 uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1; 1438 uint32_t FirstDataWord = *UnwindData; 1439 size_t N = ((FirstDataWord >> 24) & 0xff); 1440 size_t NDataWords = N + 1; 1441 lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords); 1442 } 1443 1444 _info.start_ip = thisPC; 1445 _info.end_ip = nextPC; 1446 _info.handler = personalityRoutine; 1447 _info.unwind_info = exceptionTableAddr; 1448 _info.lsda = lsda; 1449 // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0. 1450 _info.flags = isSingleWordEHT ? 1 : 0 | scope32 ? 0x2 : 0; // Use enum? 1451 1452 return true; 1453 } 1454 #endif 1455 1456 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1457 template <typename A, typename R> 1458 bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc, 1459 const UnwindInfoSections §s, 1460 uint32_t fdeSectionOffsetHint) { 1461 typename CFI_Parser<A>::FDE_Info fdeInfo; 1462 typename CFI_Parser<A>::CIE_Info cieInfo; 1463 bool foundFDE = false; 1464 bool foundInCache = false; 1465 // If compact encoding table gave offset into dwarf section, go directly there 1466 if (fdeSectionOffsetHint != 0) { 1467 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1468 (uint32_t)sects.dwarf_section_length, 1469 sects.dwarf_section + fdeSectionOffsetHint, 1470 &fdeInfo, &cieInfo); 1471 } 1472 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) 1473 if (!foundFDE && (sects.dwarf_index_section != 0)) { 1474 foundFDE = EHHeaderParser<A>::findFDE( 1475 _addressSpace, pc, sects.dwarf_index_section, 1476 (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo); 1477 } 1478 #endif 1479 if (!foundFDE) { 1480 // otherwise, search cache of previously found FDEs. 1481 pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc); 1482 if (cachedFDE != 0) { 1483 foundFDE = 1484 CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1485 (uint32_t)sects.dwarf_section_length, 1486 cachedFDE, &fdeInfo, &cieInfo); 1487 foundInCache = foundFDE; 1488 } 1489 } 1490 if (!foundFDE) { 1491 // Still not found, do full scan of __eh_frame section. 1492 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1493 (uint32_t)sects.dwarf_section_length, 0, 1494 &fdeInfo, &cieInfo); 1495 } 1496 if (foundFDE) { 1497 typename CFI_Parser<A>::PrologInfo prolog; 1498 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc, 1499 &prolog)) { 1500 // Save off parsed FDE info 1501 _info.start_ip = fdeInfo.pcStart; 1502 _info.end_ip = fdeInfo.pcEnd; 1503 _info.lsda = fdeInfo.lsda; 1504 _info.handler = cieInfo.personality; 1505 _info.gp = prolog.spExtraArgSize; 1506 _info.flags = 0; 1507 _info.format = dwarfEncoding(); 1508 _info.unwind_info = fdeInfo.fdeStart; 1509 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; 1510 _info.extra = (unw_word_t) sects.dso_base; 1511 1512 // Add to cache (to make next lookup faster) if we had no hint 1513 // and there was no index. 1514 if (!foundInCache && (fdeSectionOffsetHint == 0)) { 1515 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) 1516 if (sects.dwarf_index_section == 0) 1517 #endif 1518 DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd, 1519 fdeInfo.fdeStart); 1520 } 1521 return true; 1522 } 1523 } 1524 //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc); 1525 return false; 1526 } 1527 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1528 1529 1530 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1531 template <typename A, typename R> 1532 bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc, 1533 const UnwindInfoSections §s) { 1534 const bool log = false; 1535 if (log) 1536 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n", 1537 (uint64_t)pc, (uint64_t)sects.dso_base); 1538 1539 const UnwindSectionHeader<A> sectionHeader(_addressSpace, 1540 sects.compact_unwind_section); 1541 if (sectionHeader.version() != UNWIND_SECTION_VERSION) 1542 return false; 1543 1544 // do a binary search of top level index to find page with unwind info 1545 pint_t targetFunctionOffset = pc - sects.dso_base; 1546 const UnwindSectionIndexArray<A> topIndex(_addressSpace, 1547 sects.compact_unwind_section 1548 + sectionHeader.indexSectionOffset()); 1549 uint32_t low = 0; 1550 uint32_t high = sectionHeader.indexCount(); 1551 uint32_t last = high - 1; 1552 while (low < high) { 1553 uint32_t mid = (low + high) / 2; 1554 //if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n", 1555 //mid, low, high, topIndex.functionOffset(mid)); 1556 if (topIndex.functionOffset(mid) <= targetFunctionOffset) { 1557 if ((mid == last) || 1558 (topIndex.functionOffset(mid + 1) > targetFunctionOffset)) { 1559 low = mid; 1560 break; 1561 } else { 1562 low = mid + 1; 1563 } 1564 } else { 1565 high = mid; 1566 } 1567 } 1568 const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low); 1569 const uint32_t firstLevelNextPageFunctionOffset = 1570 topIndex.functionOffset(low + 1); 1571 const pint_t secondLevelAddr = 1572 sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low); 1573 const pint_t lsdaArrayStartAddr = 1574 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low); 1575 const pint_t lsdaArrayEndAddr = 1576 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1); 1577 if (log) 1578 fprintf(stderr, "\tfirst level search for result index=%d " 1579 "to secondLevelAddr=0x%llX\n", 1580 low, (uint64_t) secondLevelAddr); 1581 // do a binary search of second level page index 1582 uint32_t encoding = 0; 1583 pint_t funcStart = 0; 1584 pint_t funcEnd = 0; 1585 pint_t lsda = 0; 1586 pint_t personality = 0; 1587 uint32_t pageKind = _addressSpace.get32(secondLevelAddr); 1588 if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) { 1589 // regular page 1590 UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace, 1591 secondLevelAddr); 1592 UnwindSectionRegularArray<A> pageIndex( 1593 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); 1594 // binary search looks for entry with e where index[e].offset <= pc < 1595 // index[e+1].offset 1596 if (log) 1597 fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in " 1598 "regular page starting at secondLevelAddr=0x%llX\n", 1599 (uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr); 1600 low = 0; 1601 high = pageHeader.entryCount(); 1602 while (low < high) { 1603 uint32_t mid = (low + high) / 2; 1604 if (pageIndex.functionOffset(mid) <= targetFunctionOffset) { 1605 if (mid == (uint32_t)(pageHeader.entryCount() - 1)) { 1606 // at end of table 1607 low = mid; 1608 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; 1609 break; 1610 } else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) { 1611 // next is too big, so we found it 1612 low = mid; 1613 funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base; 1614 break; 1615 } else { 1616 low = mid + 1; 1617 } 1618 } else { 1619 high = mid; 1620 } 1621 } 1622 encoding = pageIndex.encoding(low); 1623 funcStart = pageIndex.functionOffset(low) + sects.dso_base; 1624 if (pc < funcStart) { 1625 if (log) 1626 fprintf( 1627 stderr, 1628 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", 1629 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); 1630 return false; 1631 } 1632 if (pc > funcEnd) { 1633 if (log) 1634 fprintf( 1635 stderr, 1636 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", 1637 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); 1638 return false; 1639 } 1640 } else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) { 1641 // compressed page 1642 UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace, 1643 secondLevelAddr); 1644 UnwindSectionCompressedArray<A> pageIndex( 1645 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); 1646 const uint32_t targetFunctionPageOffset = 1647 (uint32_t)(targetFunctionOffset - firstLevelFunctionOffset); 1648 // binary search looks for entry with e where index[e].offset <= pc < 1649 // index[e+1].offset 1650 if (log) 1651 fprintf(stderr, "\tbinary search of compressed page starting at " 1652 "secondLevelAddr=0x%llX\n", 1653 (uint64_t) secondLevelAddr); 1654 low = 0; 1655 last = pageHeader.entryCount() - 1; 1656 high = pageHeader.entryCount(); 1657 while (low < high) { 1658 uint32_t mid = (low + high) / 2; 1659 if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) { 1660 if ((mid == last) || 1661 (pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) { 1662 low = mid; 1663 break; 1664 } else { 1665 low = mid + 1; 1666 } 1667 } else { 1668 high = mid; 1669 } 1670 } 1671 funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset 1672 + sects.dso_base; 1673 if (low < last) 1674 funcEnd = 1675 pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset 1676 + sects.dso_base; 1677 else 1678 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; 1679 if (pc < funcStart) { 1680 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second " 1681 "level compressed unwind table. funcStart=0x%llX", 1682 (uint64_t) pc, (uint64_t) funcStart); 1683 return false; 1684 } 1685 if (pc > funcEnd) { 1686 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second " 1687 "level compressed unwind table. funcEnd=0x%llX", 1688 (uint64_t) pc, (uint64_t) funcEnd); 1689 return false; 1690 } 1691 uint16_t encodingIndex = pageIndex.encodingIndex(low); 1692 if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) { 1693 // encoding is in common table in section header 1694 encoding = _addressSpace.get32( 1695 sects.compact_unwind_section + 1696 sectionHeader.commonEncodingsArraySectionOffset() + 1697 encodingIndex * sizeof(uint32_t)); 1698 } else { 1699 // encoding is in page specific table 1700 uint16_t pageEncodingIndex = 1701 encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount(); 1702 encoding = _addressSpace.get32(secondLevelAddr + 1703 pageHeader.encodingsPageOffset() + 1704 pageEncodingIndex * sizeof(uint32_t)); 1705 } 1706 } else { 1707 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info at 0x%0llX bad second " 1708 "level page", 1709 (uint64_t) sects.compact_unwind_section); 1710 return false; 1711 } 1712 1713 // look up LSDA, if encoding says function has one 1714 if (encoding & UNWIND_HAS_LSDA) { 1715 UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr); 1716 uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base); 1717 low = 0; 1718 high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) / 1719 sizeof(unwind_info_section_header_lsda_index_entry); 1720 // binary search looks for entry with exact match for functionOffset 1721 if (log) 1722 fprintf(stderr, 1723 "\tbinary search of lsda table for targetFunctionOffset=0x%08X\n", 1724 funcStartOffset); 1725 while (low < high) { 1726 uint32_t mid = (low + high) / 2; 1727 if (lsdaIndex.functionOffset(mid) == funcStartOffset) { 1728 lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base; 1729 break; 1730 } else if (lsdaIndex.functionOffset(mid) < funcStartOffset) { 1731 low = mid + 1; 1732 } else { 1733 high = mid; 1734 } 1735 } 1736 if (lsda == 0) { 1737 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for " 1738 "pc=0x%0llX, but lsda table has no entry", 1739 encoding, (uint64_t) pc); 1740 return false; 1741 } 1742 } 1743 1744 // extact personality routine, if encoding says function has one 1745 uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >> 1746 (__builtin_ctz(UNWIND_PERSONALITY_MASK)); 1747 if (personalityIndex != 0) { 1748 --personalityIndex; // change 1-based to zero-based index 1749 if (personalityIndex > sectionHeader.personalityArrayCount()) { 1750 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, " 1751 "but personality table has only %d entires", 1752 encoding, personalityIndex, 1753 sectionHeader.personalityArrayCount()); 1754 return false; 1755 } 1756 int32_t personalityDelta = (int32_t)_addressSpace.get32( 1757 sects.compact_unwind_section + 1758 sectionHeader.personalityArraySectionOffset() + 1759 personalityIndex * sizeof(uint32_t)); 1760 pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta; 1761 personality = _addressSpace.getP(personalityPointer); 1762 if (log) 1763 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " 1764 "personalityDelta=0x%08X, personality=0x%08llX\n", 1765 (uint64_t) pc, personalityDelta, (uint64_t) personality); 1766 } 1767 1768 if (log) 1769 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " 1770 "encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n", 1771 (uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart); 1772 _info.start_ip = funcStart; 1773 _info.end_ip = funcEnd; 1774 _info.lsda = lsda; 1775 _info.handler = personality; 1776 _info.gp = 0; 1777 _info.flags = 0; 1778 _info.format = encoding; 1779 _info.unwind_info = 0; 1780 _info.unwind_info_size = 0; 1781 _info.extra = sects.dso_base; 1782 return true; 1783 } 1784 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1785 1786 1787 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1788 template <typename A, typename R> 1789 bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) { 1790 pint_t base; 1791 RUNTIME_FUNCTION *unwindEntry = lookUpSEHUnwindInfo(pc, &base); 1792 if (!unwindEntry) { 1793 _LIBUNWIND_DEBUG_LOG("\tpc not in table, pc=0x%llX", (uint64_t) pc); 1794 return false; 1795 } 1796 _info.gp = 0; 1797 _info.flags = 0; 1798 _info.format = 0; 1799 _info.unwind_info_size = sizeof(RUNTIME_FUNCTION); 1800 _info.unwind_info = reinterpret_cast<unw_word_t>(unwindEntry); 1801 _info.extra = base; 1802 _info.start_ip = base + unwindEntry->BeginAddress; 1803 #ifdef _LIBUNWIND_TARGET_X86_64 1804 _info.end_ip = base + unwindEntry->EndAddress; 1805 // Only fill in the handler and LSDA if they're stale. 1806 if (pc != getLastPC()) { 1807 UNWIND_INFO *xdata = reinterpret_cast<UNWIND_INFO *>(base + unwindEntry->UnwindData); 1808 if (xdata->Flags & (UNW_FLAG_EHANDLER|UNW_FLAG_UHANDLER)) { 1809 // The personality is given in the UNWIND_INFO itself. The LSDA immediately 1810 // follows the UNWIND_INFO. (This follows how both Clang and MSVC emit 1811 // these structures.) 1812 // N.B. UNWIND_INFO structs are DWORD-aligned. 1813 uint32_t lastcode = (xdata->CountOfCodes + 1) & ~1; 1814 const uint32_t *handler = reinterpret_cast<uint32_t *>(&xdata->UnwindCodes[lastcode]); 1815 _info.lsda = reinterpret_cast<unw_word_t>(handler+1); 1816 if (*handler) { 1817 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality); 1818 } else 1819 _info.handler = 0; 1820 } else { 1821 _info.lsda = 0; 1822 _info.handler = 0; 1823 } 1824 } 1825 #elif defined(_LIBUNWIND_TARGET_ARM) 1826 _info.end_ip = _info.start_ip + unwindEntry->FunctionLength; 1827 _info.lsda = 0; // FIXME 1828 _info.handler = 0; // FIXME 1829 #endif 1830 setLastPC(pc); 1831 return true; 1832 } 1833 #endif 1834 1835 1836 template <typename A, typename R> 1837 void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) { 1838 pint_t pc = (pint_t)this->getReg(UNW_REG_IP); 1839 #if defined(_LIBUNWIND_ARM_EHABI) 1840 // Remove the thumb bit so the IP represents the actual instruction address. 1841 // This matches the behaviour of _Unwind_GetIP on arm. 1842 pc &= (pint_t)~0x1; 1843 #endif 1844 1845 // If the last line of a function is a "throw" the compiler sometimes 1846 // emits no instructions after the call to __cxa_throw. This means 1847 // the return address is actually the start of the next function. 1848 // To disambiguate this, back up the pc when we know it is a return 1849 // address. 1850 if (isReturnAddress) 1851 --pc; 1852 1853 // Ask address space object to find unwind sections for this pc. 1854 UnwindInfoSections sects; 1855 if (_addressSpace.findUnwindSections(pc, sects)) { 1856 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1857 // If there is a compact unwind encoding table, look there first. 1858 if (sects.compact_unwind_section != 0) { 1859 if (this->getInfoFromCompactEncodingSection(pc, sects)) { 1860 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1861 // Found info in table, done unless encoding says to use dwarf. 1862 uint32_t dwarfOffset; 1863 if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) { 1864 if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) { 1865 // found info in dwarf, done 1866 return; 1867 } 1868 } 1869 #endif 1870 // If unwind table has entry, but entry says there is no unwind info, 1871 // record that we have no unwind info. 1872 if (_info.format == 0) 1873 _unwindInfoMissing = true; 1874 return; 1875 } 1876 } 1877 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1878 1879 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1880 // If there is SEH unwind info, look there next. 1881 if (this->getInfoFromSEH(pc)) 1882 return; 1883 #endif 1884 1885 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1886 // If there is dwarf unwind info, look there next. 1887 if (sects.dwarf_section != 0) { 1888 if (this->getInfoFromDwarfSection(pc, sects)) { 1889 // found info in dwarf, done 1890 return; 1891 } 1892 } 1893 #endif 1894 1895 #if defined(_LIBUNWIND_ARM_EHABI) 1896 // If there is ARM EHABI unwind info, look there next. 1897 if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects)) 1898 return; 1899 #endif 1900 } 1901 1902 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1903 // There is no static unwind info for this pc. Look to see if an FDE was 1904 // dynamically registered for it. 1905 pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc); 1906 if (cachedFDE != 0) { 1907 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; 1908 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; 1909 const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace, 1910 cachedFDE, &fdeInfo, &cieInfo); 1911 if (msg == NULL) { 1912 typename CFI_Parser<A>::PrologInfo prolog; 1913 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, 1914 pc, &prolog)) { 1915 // save off parsed FDE info 1916 _info.start_ip = fdeInfo.pcStart; 1917 _info.end_ip = fdeInfo.pcEnd; 1918 _info.lsda = fdeInfo.lsda; 1919 _info.handler = cieInfo.personality; 1920 _info.gp = prolog.spExtraArgSize; 1921 // Some frameless functions need SP 1922 // altered when resuming in function. 1923 _info.flags = 0; 1924 _info.format = dwarfEncoding(); 1925 _info.unwind_info = fdeInfo.fdeStart; 1926 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; 1927 _info.extra = 0; 1928 return; 1929 } 1930 } 1931 } 1932 1933 // Lastly, ask AddressSpace object about platform specific ways to locate 1934 // other FDEs. 1935 pint_t fde; 1936 if (_addressSpace.findOtherFDE(pc, fde)) { 1937 CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; 1938 CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; 1939 if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) { 1940 // Double check this FDE is for a function that includes the pc. 1941 if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) { 1942 typename CFI_Parser<A>::PrologInfo prolog; 1943 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, 1944 cieInfo, pc, &prolog)) { 1945 // save off parsed FDE info 1946 _info.start_ip = fdeInfo.pcStart; 1947 _info.end_ip = fdeInfo.pcEnd; 1948 _info.lsda = fdeInfo.lsda; 1949 _info.handler = cieInfo.personality; 1950 _info.gp = prolog.spExtraArgSize; 1951 _info.flags = 0; 1952 _info.format = dwarfEncoding(); 1953 _info.unwind_info = fdeInfo.fdeStart; 1954 _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; 1955 _info.extra = 0; 1956 return; 1957 } 1958 } 1959 } 1960 } 1961 #endif // #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1962 1963 // no unwind info, flag that we can't reliably unwind 1964 _unwindInfoMissing = true; 1965 } 1966 1967 template <typename A, typename R> 1968 int UnwindCursor<A, R>::step() { 1969 // Bottom of stack is defined is when unwind info cannot be found. 1970 if (_unwindInfoMissing) 1971 return UNW_STEP_END; 1972 1973 // Use unwinding info to modify register set as if function returned. 1974 int result; 1975 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1976 result = this->stepWithCompactEncoding(); 1977 #elif defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1978 result = this->stepWithSEHData(); 1979 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1980 result = this->stepWithDwarfFDE(); 1981 #elif defined(_LIBUNWIND_ARM_EHABI) 1982 result = this->stepWithEHABI(); 1983 #else 1984 #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \ 1985 _LIBUNWIND_SUPPORT_SEH_UNWIND or \ 1986 _LIBUNWIND_SUPPORT_DWARF_UNWIND or \ 1987 _LIBUNWIND_ARM_EHABI 1988 #endif 1989 1990 // update info based on new PC 1991 if (result == UNW_STEP_SUCCESS) { 1992 this->setInfoBasedOnIPRegister(true); 1993 if (_unwindInfoMissing) 1994 return UNW_STEP_END; 1995 } 1996 1997 return result; 1998 } 1999 2000 template <typename A, typename R> 2001 void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) { 2002 *info = _info; 2003 } 2004 2005 template <typename A, typename R> 2006 bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen, 2007 unw_word_t *offset) { 2008 return _addressSpace.findFunctionName((pint_t)this->getReg(UNW_REG_IP), 2009 buf, bufLen, offset); 2010 } 2011 2012 } // namespace libunwind 2013 2014 #endif // __UNWINDCURSOR_HPP__ 2015