1 //===----------------------------------------------------------------------===// 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 "cet_unwind.h" 15 #include <stdint.h> 16 #include <stdio.h> 17 #include <stdlib.h> 18 #include <unwind.h> 19 20 #ifdef _WIN32 21 #include <windows.h> 22 #include <ntverp.h> 23 #endif 24 #ifdef __APPLE__ 25 #include <mach-o/dyld.h> 26 #endif 27 #ifdef _AIX 28 #include <dlfcn.h> 29 #include <sys/debug.h> 30 #include <sys/pseg.h> 31 #endif 32 33 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 34 // Provide a definition for the DISPATCHER_CONTEXT struct for old (Win7 and 35 // earlier) SDKs. 36 // MinGW-w64 has always provided this struct. 37 #if defined(_WIN32) && defined(_LIBUNWIND_TARGET_X86_64) && \ 38 !defined(__MINGW32__) && VER_PRODUCTBUILD < 8000 39 struct _DISPATCHER_CONTEXT { 40 ULONG64 ControlPc; 41 ULONG64 ImageBase; 42 PRUNTIME_FUNCTION FunctionEntry; 43 ULONG64 EstablisherFrame; 44 ULONG64 TargetIp; 45 PCONTEXT ContextRecord; 46 PEXCEPTION_ROUTINE LanguageHandler; 47 PVOID HandlerData; 48 PUNWIND_HISTORY_TABLE HistoryTable; 49 ULONG ScopeIndex; 50 ULONG Fill0; 51 }; 52 #endif 53 54 struct UNWIND_INFO { 55 uint8_t Version : 3; 56 uint8_t Flags : 5; 57 uint8_t SizeOfProlog; 58 uint8_t CountOfCodes; 59 uint8_t FrameRegister : 4; 60 uint8_t FrameOffset : 4; 61 uint16_t UnwindCodes[2]; 62 }; 63 64 extern "C" _Unwind_Reason_Code __libunwind_seh_personality( 65 int, _Unwind_Action, uint64_t, _Unwind_Exception *, 66 struct _Unwind_Context *); 67 68 #endif 69 70 #include "config.h" 71 72 #include "AddressSpace.hpp" 73 #include "CompactUnwinder.hpp" 74 #include "config.h" 75 #include "DwarfInstructions.hpp" 76 #include "EHHeaderParser.hpp" 77 #include "libunwind.h" 78 #include "Registers.hpp" 79 #include "RWMutex.hpp" 80 #include "Unwind-EHABI.h" 81 82 namespace libunwind { 83 84 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 85 /// Cache of recently found FDEs. 86 template <typename A> 87 class _LIBUNWIND_HIDDEN DwarfFDECache { 88 typedef typename A::pint_t pint_t; 89 public: 90 static constexpr pint_t kSearchAll = static_cast<pint_t>(-1); 91 static pint_t findFDE(pint_t mh, pint_t pc); 92 static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde); 93 static void removeAllIn(pint_t mh); 94 static void iterateCacheEntries(void (*func)(unw_word_t ip_start, 95 unw_word_t ip_end, 96 unw_word_t fde, unw_word_t mh)); 97 98 private: 99 100 struct entry { 101 pint_t mh; 102 pint_t ip_start; 103 pint_t ip_end; 104 pint_t fde; 105 }; 106 107 // These fields are all static to avoid needing an initializer. 108 // There is only one instance of this class per process. 109 static RWMutex _lock; 110 #ifdef __APPLE__ 111 static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide); 112 static bool _registeredForDyldUnloads; 113 #endif 114 static entry *_buffer; 115 static entry *_bufferUsed; 116 static entry *_bufferEnd; 117 static entry _initialBuffer[64]; 118 }; 119 120 template <typename A> 121 typename DwarfFDECache<A>::entry * 122 DwarfFDECache<A>::_buffer = _initialBuffer; 123 124 template <typename A> 125 typename DwarfFDECache<A>::entry * 126 DwarfFDECache<A>::_bufferUsed = _initialBuffer; 127 128 template <typename A> 129 typename DwarfFDECache<A>::entry * 130 DwarfFDECache<A>::_bufferEnd = &_initialBuffer[64]; 131 132 template <typename A> 133 typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64]; 134 135 template <typename A> 136 RWMutex DwarfFDECache<A>::_lock; 137 138 #ifdef __APPLE__ 139 template <typename A> 140 bool DwarfFDECache<A>::_registeredForDyldUnloads = false; 141 #endif 142 143 template <typename A> 144 typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, pint_t pc) { 145 pint_t result = 0; 146 _LIBUNWIND_LOG_IF_FALSE(_lock.lock_shared()); 147 for (entry *p = _buffer; p < _bufferUsed; ++p) { 148 if ((mh == p->mh) || (mh == kSearchAll)) { 149 if ((p->ip_start <= pc) && (pc < p->ip_end)) { 150 result = p->fde; 151 break; 152 } 153 } 154 } 155 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock_shared()); 156 return result; 157 } 158 159 template <typename A> 160 void DwarfFDECache<A>::add(pint_t mh, pint_t ip_start, pint_t ip_end, 161 pint_t fde) { 162 #if !defined(_LIBUNWIND_NO_HEAP) 163 _LIBUNWIND_LOG_IF_FALSE(_lock.lock()); 164 if (_bufferUsed >= _bufferEnd) { 165 size_t oldSize = (size_t)(_bufferEnd - _buffer); 166 size_t newSize = oldSize * 4; 167 // Can't use operator new (we are below it). 168 entry *newBuffer = (entry *)malloc(newSize * sizeof(entry)); 169 memcpy(newBuffer, _buffer, oldSize * sizeof(entry)); 170 if (_buffer != _initialBuffer) 171 free(_buffer); 172 _buffer = newBuffer; 173 _bufferUsed = &newBuffer[oldSize]; 174 _bufferEnd = &newBuffer[newSize]; 175 } 176 _bufferUsed->mh = mh; 177 _bufferUsed->ip_start = ip_start; 178 _bufferUsed->ip_end = ip_end; 179 _bufferUsed->fde = fde; 180 ++_bufferUsed; 181 #ifdef __APPLE__ 182 if (!_registeredForDyldUnloads) { 183 _dyld_register_func_for_remove_image(&dyldUnloadHook); 184 _registeredForDyldUnloads = true; 185 } 186 #endif 187 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 188 #endif 189 } 190 191 template <typename A> 192 void DwarfFDECache<A>::removeAllIn(pint_t mh) { 193 _LIBUNWIND_LOG_IF_FALSE(_lock.lock()); 194 entry *d = _buffer; 195 for (const entry *s = _buffer; s < _bufferUsed; ++s) { 196 if (s->mh != mh) { 197 if (d != s) 198 *d = *s; 199 ++d; 200 } 201 } 202 _bufferUsed = d; 203 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 204 } 205 206 #ifdef __APPLE__ 207 template <typename A> 208 void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) { 209 removeAllIn((pint_t) mh); 210 } 211 #endif 212 213 template <typename A> 214 void DwarfFDECache<A>::iterateCacheEntries(void (*func)( 215 unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) { 216 _LIBUNWIND_LOG_IF_FALSE(_lock.lock()); 217 for (entry *p = _buffer; p < _bufferUsed; ++p) { 218 (*func)(p->ip_start, p->ip_end, p->fde, p->mh); 219 } 220 _LIBUNWIND_LOG_IF_FALSE(_lock.unlock()); 221 } 222 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 223 224 225 #define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field)) 226 227 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 228 template <typename A> class UnwindSectionHeader { 229 public: 230 UnwindSectionHeader(A &addressSpace, typename A::pint_t addr) 231 : _addressSpace(addressSpace), _addr(addr) {} 232 233 uint32_t version() const { 234 return _addressSpace.get32(_addr + 235 offsetof(unwind_info_section_header, version)); 236 } 237 uint32_t commonEncodingsArraySectionOffset() const { 238 return _addressSpace.get32(_addr + 239 offsetof(unwind_info_section_header, 240 commonEncodingsArraySectionOffset)); 241 } 242 uint32_t commonEncodingsArrayCount() const { 243 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, 244 commonEncodingsArrayCount)); 245 } 246 uint32_t personalityArraySectionOffset() const { 247 return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, 248 personalityArraySectionOffset)); 249 } 250 uint32_t personalityArrayCount() const { 251 return _addressSpace.get32( 252 _addr + offsetof(unwind_info_section_header, personalityArrayCount)); 253 } 254 uint32_t indexSectionOffset() const { 255 return _addressSpace.get32( 256 _addr + offsetof(unwind_info_section_header, indexSectionOffset)); 257 } 258 uint32_t indexCount() const { 259 return _addressSpace.get32( 260 _addr + offsetof(unwind_info_section_header, indexCount)); 261 } 262 263 private: 264 A &_addressSpace; 265 typename A::pint_t _addr; 266 }; 267 268 template <typename A> class UnwindSectionIndexArray { 269 public: 270 UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr) 271 : _addressSpace(addressSpace), _addr(addr) {} 272 273 uint32_t functionOffset(uint32_t index) const { 274 return _addressSpace.get32( 275 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 276 functionOffset)); 277 } 278 uint32_t secondLevelPagesSectionOffset(uint32_t index) const { 279 return _addressSpace.get32( 280 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 281 secondLevelPagesSectionOffset)); 282 } 283 uint32_t lsdaIndexArraySectionOffset(uint32_t index) const { 284 return _addressSpace.get32( 285 _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, 286 lsdaIndexArraySectionOffset)); 287 } 288 289 private: 290 A &_addressSpace; 291 typename A::pint_t _addr; 292 }; 293 294 template <typename A> class UnwindSectionRegularPageHeader { 295 public: 296 UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr) 297 : _addressSpace(addressSpace), _addr(addr) {} 298 299 uint32_t kind() const { 300 return _addressSpace.get32( 301 _addr + offsetof(unwind_info_regular_second_level_page_header, kind)); 302 } 303 uint16_t entryPageOffset() const { 304 return _addressSpace.get16( 305 _addr + offsetof(unwind_info_regular_second_level_page_header, 306 entryPageOffset)); 307 } 308 uint16_t entryCount() const { 309 return _addressSpace.get16( 310 _addr + 311 offsetof(unwind_info_regular_second_level_page_header, entryCount)); 312 } 313 314 private: 315 A &_addressSpace; 316 typename A::pint_t _addr; 317 }; 318 319 template <typename A> class UnwindSectionRegularArray { 320 public: 321 UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr) 322 : _addressSpace(addressSpace), _addr(addr) {} 323 324 uint32_t functionOffset(uint32_t index) const { 325 return _addressSpace.get32( 326 _addr + arrayoffsetof(unwind_info_regular_second_level_entry, index, 327 functionOffset)); 328 } 329 uint32_t encoding(uint32_t index) const { 330 return _addressSpace.get32( 331 _addr + 332 arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding)); 333 } 334 335 private: 336 A &_addressSpace; 337 typename A::pint_t _addr; 338 }; 339 340 template <typename A> class UnwindSectionCompressedPageHeader { 341 public: 342 UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr) 343 : _addressSpace(addressSpace), _addr(addr) {} 344 345 uint32_t kind() const { 346 return _addressSpace.get32( 347 _addr + 348 offsetof(unwind_info_compressed_second_level_page_header, kind)); 349 } 350 uint16_t entryPageOffset() const { 351 return _addressSpace.get16( 352 _addr + offsetof(unwind_info_compressed_second_level_page_header, 353 entryPageOffset)); 354 } 355 uint16_t entryCount() const { 356 return _addressSpace.get16( 357 _addr + 358 offsetof(unwind_info_compressed_second_level_page_header, entryCount)); 359 } 360 uint16_t encodingsPageOffset() const { 361 return _addressSpace.get16( 362 _addr + offsetof(unwind_info_compressed_second_level_page_header, 363 encodingsPageOffset)); 364 } 365 uint16_t encodingsCount() const { 366 return _addressSpace.get16( 367 _addr + offsetof(unwind_info_compressed_second_level_page_header, 368 encodingsCount)); 369 } 370 371 private: 372 A &_addressSpace; 373 typename A::pint_t _addr; 374 }; 375 376 template <typename A> class UnwindSectionCompressedArray { 377 public: 378 UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr) 379 : _addressSpace(addressSpace), _addr(addr) {} 380 381 uint32_t functionOffset(uint32_t index) const { 382 return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET( 383 _addressSpace.get32(_addr + index * sizeof(uint32_t))); 384 } 385 uint16_t encodingIndex(uint32_t index) const { 386 return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX( 387 _addressSpace.get32(_addr + index * sizeof(uint32_t))); 388 } 389 390 private: 391 A &_addressSpace; 392 typename A::pint_t _addr; 393 }; 394 395 template <typename A> class UnwindSectionLsdaArray { 396 public: 397 UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr) 398 : _addressSpace(addressSpace), _addr(addr) {} 399 400 uint32_t functionOffset(uint32_t index) const { 401 return _addressSpace.get32( 402 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, 403 index, functionOffset)); 404 } 405 uint32_t lsdaOffset(uint32_t index) const { 406 return _addressSpace.get32( 407 _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, 408 index, lsdaOffset)); 409 } 410 411 private: 412 A &_addressSpace; 413 typename A::pint_t _addr; 414 }; 415 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 416 417 class _LIBUNWIND_HIDDEN AbstractUnwindCursor { 418 public: 419 // NOTE: provide a class specific placement deallocation function (S5.3.4 p20) 420 // This avoids an unnecessary dependency to libc++abi. 421 void operator delete(void *, size_t) {} 422 423 virtual ~AbstractUnwindCursor() {} 424 virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); } 425 virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); } 426 virtual void setReg(int, unw_word_t) { 427 _LIBUNWIND_ABORT("setReg not implemented"); 428 } 429 virtual bool validFloatReg(int) { 430 _LIBUNWIND_ABORT("validFloatReg not implemented"); 431 } 432 virtual unw_fpreg_t getFloatReg(int) { 433 _LIBUNWIND_ABORT("getFloatReg not implemented"); 434 } 435 virtual void setFloatReg(int, unw_fpreg_t) { 436 _LIBUNWIND_ABORT("setFloatReg not implemented"); 437 } 438 virtual int step() { _LIBUNWIND_ABORT("step not implemented"); } 439 virtual void getInfo(unw_proc_info_t *) { 440 _LIBUNWIND_ABORT("getInfo not implemented"); 441 } 442 virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); } 443 virtual bool isSignalFrame() { 444 _LIBUNWIND_ABORT("isSignalFrame not implemented"); 445 } 446 virtual bool getFunctionName(char *, size_t, unw_word_t *) { 447 _LIBUNWIND_ABORT("getFunctionName not implemented"); 448 } 449 virtual void setInfoBasedOnIPRegister(bool = false) { 450 _LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented"); 451 } 452 virtual const char *getRegisterName(int) { 453 _LIBUNWIND_ABORT("getRegisterName not implemented"); 454 } 455 #ifdef __arm__ 456 virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); } 457 #endif 458 459 #ifdef _AIX 460 virtual uintptr_t getDataRelBase() { 461 _LIBUNWIND_ABORT("getDataRelBase not implemented"); 462 } 463 #endif 464 465 #if defined(_LIBUNWIND_USE_CET) 466 virtual void *get_registers() { 467 _LIBUNWIND_ABORT("get_registers not implemented"); 468 } 469 #endif 470 }; 471 472 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) && defined(_WIN32) 473 474 /// \c UnwindCursor contains all state (including all register values) during 475 /// an unwind. This is normally stack-allocated inside a unw_cursor_t. 476 template <typename A, typename R> 477 class UnwindCursor : public AbstractUnwindCursor { 478 typedef typename A::pint_t pint_t; 479 public: 480 UnwindCursor(unw_context_t *context, A &as); 481 UnwindCursor(CONTEXT *context, A &as); 482 UnwindCursor(A &as, void *threadArg); 483 virtual ~UnwindCursor() {} 484 virtual bool validReg(int); 485 virtual unw_word_t getReg(int); 486 virtual void setReg(int, unw_word_t); 487 virtual bool validFloatReg(int); 488 virtual unw_fpreg_t getFloatReg(int); 489 virtual void setFloatReg(int, unw_fpreg_t); 490 virtual int step(); 491 virtual void getInfo(unw_proc_info_t *); 492 virtual void jumpto(); 493 virtual bool isSignalFrame(); 494 virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off); 495 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false); 496 virtual const char *getRegisterName(int num); 497 #ifdef __arm__ 498 virtual void saveVFPAsX(); 499 #endif 500 501 DISPATCHER_CONTEXT *getDispatcherContext() { return &_dispContext; } 502 void setDispatcherContext(DISPATCHER_CONTEXT *disp) { _dispContext = *disp; } 503 504 // libunwind does not and should not depend on C++ library which means that we 505 // need our own defition of inline placement new. 506 static void *operator new(size_t, UnwindCursor<A, R> *p) { return p; } 507 508 private: 509 510 pint_t getLastPC() const { return _dispContext.ControlPc; } 511 void setLastPC(pint_t pc) { _dispContext.ControlPc = pc; } 512 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) { 513 _dispContext.FunctionEntry = RtlLookupFunctionEntry(pc, 514 &_dispContext.ImageBase, 515 _dispContext.HistoryTable); 516 *base = _dispContext.ImageBase; 517 return _dispContext.FunctionEntry; 518 } 519 bool getInfoFromSEH(pint_t pc); 520 int stepWithSEHData() { 521 _dispContext.LanguageHandler = RtlVirtualUnwind(UNW_FLAG_UHANDLER, 522 _dispContext.ImageBase, 523 _dispContext.ControlPc, 524 _dispContext.FunctionEntry, 525 _dispContext.ContextRecord, 526 &_dispContext.HandlerData, 527 &_dispContext.EstablisherFrame, 528 NULL); 529 // Update some fields of the unwind info now, since we have them. 530 _info.lsda = reinterpret_cast<unw_word_t>(_dispContext.HandlerData); 531 if (_dispContext.LanguageHandler) { 532 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality); 533 } else 534 _info.handler = 0; 535 return UNW_STEP_SUCCESS; 536 } 537 538 A &_addressSpace; 539 unw_proc_info_t _info; 540 DISPATCHER_CONTEXT _dispContext; 541 CONTEXT _msContext; 542 UNWIND_HISTORY_TABLE _histTable; 543 bool _unwindInfoMissing; 544 }; 545 546 547 template <typename A, typename R> 548 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as) 549 : _addressSpace(as), _unwindInfoMissing(false) { 550 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 551 "UnwindCursor<> does not fit in unw_cursor_t"); 552 static_assert((alignof(UnwindCursor<A, R>) <= alignof(unw_cursor_t)), 553 "UnwindCursor<> requires more alignment than unw_cursor_t"); 554 memset(&_info, 0, sizeof(_info)); 555 memset(&_histTable, 0, sizeof(_histTable)); 556 _dispContext.ContextRecord = &_msContext; 557 _dispContext.HistoryTable = &_histTable; 558 // Initialize MS context from ours. 559 R r(context); 560 _msContext.ContextFlags = CONTEXT_CONTROL|CONTEXT_INTEGER|CONTEXT_FLOATING_POINT; 561 #if defined(_LIBUNWIND_TARGET_X86_64) 562 _msContext.Rax = r.getRegister(UNW_X86_64_RAX); 563 _msContext.Rcx = r.getRegister(UNW_X86_64_RCX); 564 _msContext.Rdx = r.getRegister(UNW_X86_64_RDX); 565 _msContext.Rbx = r.getRegister(UNW_X86_64_RBX); 566 _msContext.Rsp = r.getRegister(UNW_X86_64_RSP); 567 _msContext.Rbp = r.getRegister(UNW_X86_64_RBP); 568 _msContext.Rsi = r.getRegister(UNW_X86_64_RSI); 569 _msContext.Rdi = r.getRegister(UNW_X86_64_RDI); 570 _msContext.R8 = r.getRegister(UNW_X86_64_R8); 571 _msContext.R9 = r.getRegister(UNW_X86_64_R9); 572 _msContext.R10 = r.getRegister(UNW_X86_64_R10); 573 _msContext.R11 = r.getRegister(UNW_X86_64_R11); 574 _msContext.R12 = r.getRegister(UNW_X86_64_R12); 575 _msContext.R13 = r.getRegister(UNW_X86_64_R13); 576 _msContext.R14 = r.getRegister(UNW_X86_64_R14); 577 _msContext.R15 = r.getRegister(UNW_X86_64_R15); 578 _msContext.Rip = r.getRegister(UNW_REG_IP); 579 union { 580 v128 v; 581 M128A m; 582 } t; 583 t.v = r.getVectorRegister(UNW_X86_64_XMM0); 584 _msContext.Xmm0 = t.m; 585 t.v = r.getVectorRegister(UNW_X86_64_XMM1); 586 _msContext.Xmm1 = t.m; 587 t.v = r.getVectorRegister(UNW_X86_64_XMM2); 588 _msContext.Xmm2 = t.m; 589 t.v = r.getVectorRegister(UNW_X86_64_XMM3); 590 _msContext.Xmm3 = t.m; 591 t.v = r.getVectorRegister(UNW_X86_64_XMM4); 592 _msContext.Xmm4 = t.m; 593 t.v = r.getVectorRegister(UNW_X86_64_XMM5); 594 _msContext.Xmm5 = t.m; 595 t.v = r.getVectorRegister(UNW_X86_64_XMM6); 596 _msContext.Xmm6 = t.m; 597 t.v = r.getVectorRegister(UNW_X86_64_XMM7); 598 _msContext.Xmm7 = t.m; 599 t.v = r.getVectorRegister(UNW_X86_64_XMM8); 600 _msContext.Xmm8 = t.m; 601 t.v = r.getVectorRegister(UNW_X86_64_XMM9); 602 _msContext.Xmm9 = t.m; 603 t.v = r.getVectorRegister(UNW_X86_64_XMM10); 604 _msContext.Xmm10 = t.m; 605 t.v = r.getVectorRegister(UNW_X86_64_XMM11); 606 _msContext.Xmm11 = t.m; 607 t.v = r.getVectorRegister(UNW_X86_64_XMM12); 608 _msContext.Xmm12 = t.m; 609 t.v = r.getVectorRegister(UNW_X86_64_XMM13); 610 _msContext.Xmm13 = t.m; 611 t.v = r.getVectorRegister(UNW_X86_64_XMM14); 612 _msContext.Xmm14 = t.m; 613 t.v = r.getVectorRegister(UNW_X86_64_XMM15); 614 _msContext.Xmm15 = t.m; 615 #elif defined(_LIBUNWIND_TARGET_ARM) 616 _msContext.R0 = r.getRegister(UNW_ARM_R0); 617 _msContext.R1 = r.getRegister(UNW_ARM_R1); 618 _msContext.R2 = r.getRegister(UNW_ARM_R2); 619 _msContext.R3 = r.getRegister(UNW_ARM_R3); 620 _msContext.R4 = r.getRegister(UNW_ARM_R4); 621 _msContext.R5 = r.getRegister(UNW_ARM_R5); 622 _msContext.R6 = r.getRegister(UNW_ARM_R6); 623 _msContext.R7 = r.getRegister(UNW_ARM_R7); 624 _msContext.R8 = r.getRegister(UNW_ARM_R8); 625 _msContext.R9 = r.getRegister(UNW_ARM_R9); 626 _msContext.R10 = r.getRegister(UNW_ARM_R10); 627 _msContext.R11 = r.getRegister(UNW_ARM_R11); 628 _msContext.R12 = r.getRegister(UNW_ARM_R12); 629 _msContext.Sp = r.getRegister(UNW_ARM_SP); 630 _msContext.Lr = r.getRegister(UNW_ARM_LR); 631 _msContext.Pc = r.getRegister(UNW_ARM_IP); 632 for (int i = UNW_ARM_D0; i <= UNW_ARM_D31; ++i) { 633 union { 634 uint64_t w; 635 double d; 636 } d; 637 d.d = r.getFloatRegister(i); 638 _msContext.D[i - UNW_ARM_D0] = d.w; 639 } 640 #elif defined(_LIBUNWIND_TARGET_AARCH64) 641 for (int i = UNW_AARCH64_X0; i <= UNW_ARM64_X30; ++i) 642 _msContext.X[i - UNW_AARCH64_X0] = r.getRegister(i); 643 _msContext.Sp = r.getRegister(UNW_REG_SP); 644 _msContext.Pc = r.getRegister(UNW_REG_IP); 645 for (int i = UNW_AARCH64_V0; i <= UNW_ARM64_D31; ++i) 646 _msContext.V[i - UNW_AARCH64_V0].D[0] = r.getFloatRegister(i); 647 #endif 648 } 649 650 template <typename A, typename R> 651 UnwindCursor<A, R>::UnwindCursor(CONTEXT *context, A &as) 652 : _addressSpace(as), _unwindInfoMissing(false) { 653 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 654 "UnwindCursor<> does not fit in unw_cursor_t"); 655 memset(&_info, 0, sizeof(_info)); 656 memset(&_histTable, 0, sizeof(_histTable)); 657 _dispContext.ContextRecord = &_msContext; 658 _dispContext.HistoryTable = &_histTable; 659 _msContext = *context; 660 } 661 662 663 template <typename A, typename R> 664 bool UnwindCursor<A, R>::validReg(int regNum) { 665 if (regNum == UNW_REG_IP || regNum == UNW_REG_SP) return true; 666 #if defined(_LIBUNWIND_TARGET_X86_64) 667 if (regNum >= UNW_X86_64_RAX && regNum <= UNW_X86_64_R15) return true; 668 #elif defined(_LIBUNWIND_TARGET_ARM) 669 if ((regNum >= UNW_ARM_R0 && regNum <= UNW_ARM_R15) || 670 regNum == UNW_ARM_RA_AUTH_CODE) 671 return true; 672 #elif defined(_LIBUNWIND_TARGET_AARCH64) 673 if (regNum >= UNW_AARCH64_X0 && regNum <= UNW_ARM64_X30) return true; 674 #endif 675 return false; 676 } 677 678 template <typename A, typename R> 679 unw_word_t UnwindCursor<A, R>::getReg(int regNum) { 680 switch (regNum) { 681 #if defined(_LIBUNWIND_TARGET_X86_64) 682 case UNW_REG_IP: return _msContext.Rip; 683 case UNW_X86_64_RAX: return _msContext.Rax; 684 case UNW_X86_64_RDX: return _msContext.Rdx; 685 case UNW_X86_64_RCX: return _msContext.Rcx; 686 case UNW_X86_64_RBX: return _msContext.Rbx; 687 case UNW_REG_SP: 688 case UNW_X86_64_RSP: return _msContext.Rsp; 689 case UNW_X86_64_RBP: return _msContext.Rbp; 690 case UNW_X86_64_RSI: return _msContext.Rsi; 691 case UNW_X86_64_RDI: return _msContext.Rdi; 692 case UNW_X86_64_R8: return _msContext.R8; 693 case UNW_X86_64_R9: return _msContext.R9; 694 case UNW_X86_64_R10: return _msContext.R10; 695 case UNW_X86_64_R11: return _msContext.R11; 696 case UNW_X86_64_R12: return _msContext.R12; 697 case UNW_X86_64_R13: return _msContext.R13; 698 case UNW_X86_64_R14: return _msContext.R14; 699 case UNW_X86_64_R15: return _msContext.R15; 700 #elif defined(_LIBUNWIND_TARGET_ARM) 701 case UNW_ARM_R0: return _msContext.R0; 702 case UNW_ARM_R1: return _msContext.R1; 703 case UNW_ARM_R2: return _msContext.R2; 704 case UNW_ARM_R3: return _msContext.R3; 705 case UNW_ARM_R4: return _msContext.R4; 706 case UNW_ARM_R5: return _msContext.R5; 707 case UNW_ARM_R6: return _msContext.R6; 708 case UNW_ARM_R7: return _msContext.R7; 709 case UNW_ARM_R8: return _msContext.R8; 710 case UNW_ARM_R9: return _msContext.R9; 711 case UNW_ARM_R10: return _msContext.R10; 712 case UNW_ARM_R11: return _msContext.R11; 713 case UNW_ARM_R12: return _msContext.R12; 714 case UNW_REG_SP: 715 case UNW_ARM_SP: return _msContext.Sp; 716 case UNW_ARM_LR: return _msContext.Lr; 717 case UNW_REG_IP: 718 case UNW_ARM_IP: return _msContext.Pc; 719 #elif defined(_LIBUNWIND_TARGET_AARCH64) 720 case UNW_REG_SP: return _msContext.Sp; 721 case UNW_REG_IP: return _msContext.Pc; 722 default: return _msContext.X[regNum - UNW_AARCH64_X0]; 723 #endif 724 } 725 _LIBUNWIND_ABORT("unsupported register"); 726 } 727 728 template <typename A, typename R> 729 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) { 730 switch (regNum) { 731 #if defined(_LIBUNWIND_TARGET_X86_64) 732 case UNW_REG_IP: _msContext.Rip = value; break; 733 case UNW_X86_64_RAX: _msContext.Rax = value; break; 734 case UNW_X86_64_RDX: _msContext.Rdx = value; break; 735 case UNW_X86_64_RCX: _msContext.Rcx = value; break; 736 case UNW_X86_64_RBX: _msContext.Rbx = value; break; 737 case UNW_REG_SP: 738 case UNW_X86_64_RSP: _msContext.Rsp = value; break; 739 case UNW_X86_64_RBP: _msContext.Rbp = value; break; 740 case UNW_X86_64_RSI: _msContext.Rsi = value; break; 741 case UNW_X86_64_RDI: _msContext.Rdi = value; break; 742 case UNW_X86_64_R8: _msContext.R8 = value; break; 743 case UNW_X86_64_R9: _msContext.R9 = value; break; 744 case UNW_X86_64_R10: _msContext.R10 = value; break; 745 case UNW_X86_64_R11: _msContext.R11 = value; break; 746 case UNW_X86_64_R12: _msContext.R12 = value; break; 747 case UNW_X86_64_R13: _msContext.R13 = value; break; 748 case UNW_X86_64_R14: _msContext.R14 = value; break; 749 case UNW_X86_64_R15: _msContext.R15 = value; break; 750 #elif defined(_LIBUNWIND_TARGET_ARM) 751 case UNW_ARM_R0: _msContext.R0 = value; break; 752 case UNW_ARM_R1: _msContext.R1 = value; break; 753 case UNW_ARM_R2: _msContext.R2 = value; break; 754 case UNW_ARM_R3: _msContext.R3 = value; break; 755 case UNW_ARM_R4: _msContext.R4 = value; break; 756 case UNW_ARM_R5: _msContext.R5 = value; break; 757 case UNW_ARM_R6: _msContext.R6 = value; break; 758 case UNW_ARM_R7: _msContext.R7 = value; break; 759 case UNW_ARM_R8: _msContext.R8 = value; break; 760 case UNW_ARM_R9: _msContext.R9 = value; break; 761 case UNW_ARM_R10: _msContext.R10 = value; break; 762 case UNW_ARM_R11: _msContext.R11 = value; break; 763 case UNW_ARM_R12: _msContext.R12 = value; break; 764 case UNW_REG_SP: 765 case UNW_ARM_SP: _msContext.Sp = value; break; 766 case UNW_ARM_LR: _msContext.Lr = value; break; 767 case UNW_REG_IP: 768 case UNW_ARM_IP: _msContext.Pc = value; break; 769 #elif defined(_LIBUNWIND_TARGET_AARCH64) 770 case UNW_REG_SP: _msContext.Sp = value; break; 771 case UNW_REG_IP: _msContext.Pc = value; break; 772 case UNW_AARCH64_X0: 773 case UNW_AARCH64_X1: 774 case UNW_AARCH64_X2: 775 case UNW_AARCH64_X3: 776 case UNW_AARCH64_X4: 777 case UNW_AARCH64_X5: 778 case UNW_AARCH64_X6: 779 case UNW_AARCH64_X7: 780 case UNW_AARCH64_X8: 781 case UNW_AARCH64_X9: 782 case UNW_AARCH64_X10: 783 case UNW_AARCH64_X11: 784 case UNW_AARCH64_X12: 785 case UNW_AARCH64_X13: 786 case UNW_AARCH64_X14: 787 case UNW_AARCH64_X15: 788 case UNW_AARCH64_X16: 789 case UNW_AARCH64_X17: 790 case UNW_AARCH64_X18: 791 case UNW_AARCH64_X19: 792 case UNW_AARCH64_X20: 793 case UNW_AARCH64_X21: 794 case UNW_AARCH64_X22: 795 case UNW_AARCH64_X23: 796 case UNW_AARCH64_X24: 797 case UNW_AARCH64_X25: 798 case UNW_AARCH64_X26: 799 case UNW_AARCH64_X27: 800 case UNW_AARCH64_X28: 801 case UNW_AARCH64_FP: 802 case UNW_AARCH64_LR: _msContext.X[regNum - UNW_ARM64_X0] = value; break; 803 #endif 804 default: 805 _LIBUNWIND_ABORT("unsupported register"); 806 } 807 } 808 809 template <typename A, typename R> 810 bool UnwindCursor<A, R>::validFloatReg(int regNum) { 811 #if defined(_LIBUNWIND_TARGET_ARM) 812 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) return true; 813 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) return true; 814 #elif defined(_LIBUNWIND_TARGET_AARCH64) 815 if (regNum >= UNW_AARCH64_V0 && regNum <= UNW_ARM64_D31) return true; 816 #else 817 (void)regNum; 818 #endif 819 return false; 820 } 821 822 template <typename A, typename R> 823 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) { 824 #if defined(_LIBUNWIND_TARGET_ARM) 825 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) { 826 union { 827 uint32_t w; 828 float f; 829 } d; 830 d.w = _msContext.S[regNum - UNW_ARM_S0]; 831 return d.f; 832 } 833 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) { 834 union { 835 uint64_t w; 836 double d; 837 } d; 838 d.w = _msContext.D[regNum - UNW_ARM_D0]; 839 return d.d; 840 } 841 _LIBUNWIND_ABORT("unsupported float register"); 842 #elif defined(_LIBUNWIND_TARGET_AARCH64) 843 return _msContext.V[regNum - UNW_AARCH64_V0].D[0]; 844 #else 845 (void)regNum; 846 _LIBUNWIND_ABORT("float registers unimplemented"); 847 #endif 848 } 849 850 template <typename A, typename R> 851 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) { 852 #if defined(_LIBUNWIND_TARGET_ARM) 853 if (regNum >= UNW_ARM_S0 && regNum <= UNW_ARM_S31) { 854 union { 855 uint32_t w; 856 float f; 857 } d; 858 d.f = value; 859 _msContext.S[regNum - UNW_ARM_S0] = d.w; 860 } 861 if (regNum >= UNW_ARM_D0 && regNum <= UNW_ARM_D31) { 862 union { 863 uint64_t w; 864 double d; 865 } d; 866 d.d = value; 867 _msContext.D[regNum - UNW_ARM_D0] = d.w; 868 } 869 _LIBUNWIND_ABORT("unsupported float register"); 870 #elif defined(_LIBUNWIND_TARGET_AARCH64) 871 _msContext.V[regNum - UNW_AARCH64_V0].D[0] = value; 872 #else 873 (void)regNum; 874 (void)value; 875 _LIBUNWIND_ABORT("float registers unimplemented"); 876 #endif 877 } 878 879 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() { 880 RtlRestoreContext(&_msContext, nullptr); 881 } 882 883 #ifdef __arm__ 884 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {} 885 #endif 886 887 template <typename A, typename R> 888 const char *UnwindCursor<A, R>::getRegisterName(int regNum) { 889 return R::getRegisterName(regNum); 890 } 891 892 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() { 893 return false; 894 } 895 896 #else // !defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) || !defined(_WIN32) 897 898 /// UnwindCursor contains all state (including all register values) during 899 /// an unwind. This is normally stack allocated inside a unw_cursor_t. 900 template <typename A, typename R> 901 class UnwindCursor : public AbstractUnwindCursor{ 902 typedef typename A::pint_t pint_t; 903 public: 904 UnwindCursor(unw_context_t *context, A &as); 905 UnwindCursor(A &as, void *threadArg); 906 virtual ~UnwindCursor() {} 907 virtual bool validReg(int); 908 virtual unw_word_t getReg(int); 909 virtual void setReg(int, unw_word_t); 910 virtual bool validFloatReg(int); 911 virtual unw_fpreg_t getFloatReg(int); 912 virtual void setFloatReg(int, unw_fpreg_t); 913 virtual int step(); 914 virtual void getInfo(unw_proc_info_t *); 915 virtual void jumpto(); 916 virtual bool isSignalFrame(); 917 virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off); 918 virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false); 919 virtual const char *getRegisterName(int num); 920 #ifdef __arm__ 921 virtual void saveVFPAsX(); 922 #endif 923 924 #ifdef _AIX 925 virtual uintptr_t getDataRelBase(); 926 #endif 927 928 #if defined(_LIBUNWIND_USE_CET) 929 virtual void *get_registers() { return &_registers; } 930 #endif 931 932 // libunwind does not and should not depend on C++ library which means that we 933 // need our own defition of inline placement new. 934 static void *operator new(size_t, UnwindCursor<A, R> *p) { return p; } 935 936 private: 937 938 #if defined(_LIBUNWIND_ARM_EHABI) 939 bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections §s); 940 941 int stepWithEHABI() { 942 size_t len = 0; 943 size_t off = 0; 944 // FIXME: Calling decode_eht_entry() here is violating the libunwind 945 // abstraction layer. 946 const uint32_t *ehtp = 947 decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info), 948 &off, &len); 949 if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) != 950 _URC_CONTINUE_UNWIND) 951 return UNW_STEP_END; 952 return UNW_STEP_SUCCESS; 953 } 954 #endif 955 956 #if defined(_LIBUNWIND_TARGET_LINUX) && (defined(_LIBUNWIND_TARGET_AARCH64) || defined(_LIBUNWIND_TARGET_S390X)) 957 bool setInfoForSigReturn() { 958 R dummy; 959 return setInfoForSigReturn(dummy); 960 } 961 int stepThroughSigReturn() { 962 R dummy; 963 return stepThroughSigReturn(dummy); 964 } 965 #if defined(_LIBUNWIND_TARGET_AARCH64) 966 bool setInfoForSigReturn(Registers_arm64 &); 967 int stepThroughSigReturn(Registers_arm64 &); 968 #endif 969 #if defined(_LIBUNWIND_TARGET_S390X) 970 bool setInfoForSigReturn(Registers_s390x &); 971 int stepThroughSigReturn(Registers_s390x &); 972 #endif 973 template <typename Registers> bool setInfoForSigReturn(Registers &) { 974 return false; 975 } 976 template <typename Registers> int stepThroughSigReturn(Registers &) { 977 return UNW_STEP_END; 978 } 979 #endif 980 981 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 982 bool getInfoFromFdeCie(const typename CFI_Parser<A>::FDE_Info &fdeInfo, 983 const typename CFI_Parser<A>::CIE_Info &cieInfo, 984 pint_t pc, uintptr_t dso_base); 985 bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections §s, 986 uint32_t fdeSectionOffsetHint=0); 987 int stepWithDwarfFDE() { 988 return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace, 989 (pint_t)this->getReg(UNW_REG_IP), 990 (pint_t)_info.unwind_info, 991 _registers, _isSignalFrame); 992 } 993 #endif 994 995 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 996 bool getInfoFromCompactEncodingSection(pint_t pc, 997 const UnwindInfoSections §s); 998 int stepWithCompactEncoding() { 999 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1000 if ( compactSaysUseDwarf() ) 1001 return stepWithDwarfFDE(); 1002 #endif 1003 R dummy; 1004 return stepWithCompactEncoding(dummy); 1005 } 1006 1007 #if defined(_LIBUNWIND_TARGET_X86_64) 1008 int stepWithCompactEncoding(Registers_x86_64 &) { 1009 return CompactUnwinder_x86_64<A>::stepWithCompactEncoding( 1010 _info.format, _info.start_ip, _addressSpace, _registers); 1011 } 1012 #endif 1013 1014 #if defined(_LIBUNWIND_TARGET_I386) 1015 int stepWithCompactEncoding(Registers_x86 &) { 1016 return CompactUnwinder_x86<A>::stepWithCompactEncoding( 1017 _info.format, (uint32_t)_info.start_ip, _addressSpace, _registers); 1018 } 1019 #endif 1020 1021 #if defined(_LIBUNWIND_TARGET_PPC) 1022 int stepWithCompactEncoding(Registers_ppc &) { 1023 return UNW_EINVAL; 1024 } 1025 #endif 1026 1027 #if defined(_LIBUNWIND_TARGET_PPC64) 1028 int stepWithCompactEncoding(Registers_ppc64 &) { 1029 return UNW_EINVAL; 1030 } 1031 #endif 1032 1033 1034 #if defined(_LIBUNWIND_TARGET_AARCH64) 1035 int stepWithCompactEncoding(Registers_arm64 &) { 1036 return CompactUnwinder_arm64<A>::stepWithCompactEncoding( 1037 _info.format, _info.start_ip, _addressSpace, _registers); 1038 } 1039 #endif 1040 1041 #if defined(_LIBUNWIND_TARGET_MIPS_O32) 1042 int stepWithCompactEncoding(Registers_mips_o32 &) { 1043 return UNW_EINVAL; 1044 } 1045 #endif 1046 1047 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI) 1048 int stepWithCompactEncoding(Registers_mips_newabi &) { 1049 return UNW_EINVAL; 1050 } 1051 #endif 1052 1053 #if defined(_LIBUNWIND_TARGET_SPARC) 1054 int stepWithCompactEncoding(Registers_sparc &) { return UNW_EINVAL; } 1055 #endif 1056 1057 #if defined(_LIBUNWIND_TARGET_SPARC64) 1058 int stepWithCompactEncoding(Registers_sparc64 &) { return UNW_EINVAL; } 1059 #endif 1060 1061 #if defined (_LIBUNWIND_TARGET_RISCV) 1062 int stepWithCompactEncoding(Registers_riscv &) { 1063 return UNW_EINVAL; 1064 } 1065 #endif 1066 1067 bool compactSaysUseDwarf(uint32_t *offset=NULL) const { 1068 R dummy; 1069 return compactSaysUseDwarf(dummy, offset); 1070 } 1071 1072 #if defined(_LIBUNWIND_TARGET_X86_64) 1073 bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const { 1074 if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) { 1075 if (offset) 1076 *offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET); 1077 return true; 1078 } 1079 return false; 1080 } 1081 #endif 1082 1083 #if defined(_LIBUNWIND_TARGET_I386) 1084 bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const { 1085 if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) { 1086 if (offset) 1087 *offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET); 1088 return true; 1089 } 1090 return false; 1091 } 1092 #endif 1093 1094 #if defined(_LIBUNWIND_TARGET_PPC) 1095 bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const { 1096 return true; 1097 } 1098 #endif 1099 1100 #if defined(_LIBUNWIND_TARGET_PPC64) 1101 bool compactSaysUseDwarf(Registers_ppc64 &, uint32_t *) const { 1102 return true; 1103 } 1104 #endif 1105 1106 #if defined(_LIBUNWIND_TARGET_AARCH64) 1107 bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const { 1108 if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) { 1109 if (offset) 1110 *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET); 1111 return true; 1112 } 1113 return false; 1114 } 1115 #endif 1116 1117 #if defined(_LIBUNWIND_TARGET_MIPS_O32) 1118 bool compactSaysUseDwarf(Registers_mips_o32 &, uint32_t *) const { 1119 return true; 1120 } 1121 #endif 1122 1123 #if defined(_LIBUNWIND_TARGET_MIPS_NEWABI) 1124 bool compactSaysUseDwarf(Registers_mips_newabi &, uint32_t *) const { 1125 return true; 1126 } 1127 #endif 1128 1129 #if defined(_LIBUNWIND_TARGET_SPARC) 1130 bool compactSaysUseDwarf(Registers_sparc &, uint32_t *) const { return true; } 1131 #endif 1132 1133 #if defined(_LIBUNWIND_TARGET_SPARC64) 1134 bool compactSaysUseDwarf(Registers_sparc64 &, uint32_t *) const { 1135 return true; 1136 } 1137 #endif 1138 1139 #if defined (_LIBUNWIND_TARGET_RISCV) 1140 bool compactSaysUseDwarf(Registers_riscv &, uint32_t *) const { 1141 return true; 1142 } 1143 #endif 1144 1145 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1146 1147 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1148 compact_unwind_encoding_t dwarfEncoding() const { 1149 R dummy; 1150 return dwarfEncoding(dummy); 1151 } 1152 1153 #if defined(_LIBUNWIND_TARGET_X86_64) 1154 compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const { 1155 return UNWIND_X86_64_MODE_DWARF; 1156 } 1157 #endif 1158 1159 #if defined(_LIBUNWIND_TARGET_I386) 1160 compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const { 1161 return UNWIND_X86_MODE_DWARF; 1162 } 1163 #endif 1164 1165 #if defined(_LIBUNWIND_TARGET_PPC) 1166 compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const { 1167 return 0; 1168 } 1169 #endif 1170 1171 #if defined(_LIBUNWIND_TARGET_PPC64) 1172 compact_unwind_encoding_t dwarfEncoding(Registers_ppc64 &) const { 1173 return 0; 1174 } 1175 #endif 1176 1177 #if defined(_LIBUNWIND_TARGET_AARCH64) 1178 compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const { 1179 return UNWIND_ARM64_MODE_DWARF; 1180 } 1181 #endif 1182 1183 #if defined(_LIBUNWIND_TARGET_ARM) 1184 compact_unwind_encoding_t dwarfEncoding(Registers_arm &) const { 1185 return 0; 1186 } 1187 #endif 1188 1189 #if defined (_LIBUNWIND_TARGET_OR1K) 1190 compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const { 1191 return 0; 1192 } 1193 #endif 1194 1195 #if defined (_LIBUNWIND_TARGET_HEXAGON) 1196 compact_unwind_encoding_t dwarfEncoding(Registers_hexagon &) const { 1197 return 0; 1198 } 1199 #endif 1200 1201 #if defined (_LIBUNWIND_TARGET_MIPS_O32) 1202 compact_unwind_encoding_t dwarfEncoding(Registers_mips_o32 &) const { 1203 return 0; 1204 } 1205 #endif 1206 1207 #if defined (_LIBUNWIND_TARGET_MIPS_NEWABI) 1208 compact_unwind_encoding_t dwarfEncoding(Registers_mips_newabi &) const { 1209 return 0; 1210 } 1211 #endif 1212 1213 #if defined(_LIBUNWIND_TARGET_SPARC) 1214 compact_unwind_encoding_t dwarfEncoding(Registers_sparc &) const { return 0; } 1215 #endif 1216 1217 #if defined(_LIBUNWIND_TARGET_SPARC64) 1218 compact_unwind_encoding_t dwarfEncoding(Registers_sparc64 &) const { 1219 return 0; 1220 } 1221 #endif 1222 1223 #if defined (_LIBUNWIND_TARGET_RISCV) 1224 compact_unwind_encoding_t dwarfEncoding(Registers_riscv &) const { 1225 return 0; 1226 } 1227 #endif 1228 1229 #if defined (_LIBUNWIND_TARGET_S390X) 1230 compact_unwind_encoding_t dwarfEncoding(Registers_s390x &) const { 1231 return 0; 1232 } 1233 #endif 1234 1235 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1236 1237 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1238 // For runtime environments using SEH unwind data without Windows runtime 1239 // support. 1240 pint_t getLastPC() const { /* FIXME: Implement */ return 0; } 1241 void setLastPC(pint_t pc) { /* FIXME: Implement */ } 1242 RUNTIME_FUNCTION *lookUpSEHUnwindInfo(pint_t pc, pint_t *base) { 1243 /* FIXME: Implement */ 1244 *base = 0; 1245 return nullptr; 1246 } 1247 bool getInfoFromSEH(pint_t pc); 1248 int stepWithSEHData() { /* FIXME: Implement */ return 0; } 1249 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1250 1251 #if defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 1252 bool getInfoFromTBTable(pint_t pc, R ®isters); 1253 int stepWithTBTable(pint_t pc, tbtable *TBTable, R ®isters, 1254 bool &isSignalFrame); 1255 int stepWithTBTableData() { 1256 return stepWithTBTable(reinterpret_cast<pint_t>(this->getReg(UNW_REG_IP)), 1257 reinterpret_cast<tbtable *>(_info.unwind_info), 1258 _registers, _isSignalFrame); 1259 } 1260 #endif // defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 1261 1262 A &_addressSpace; 1263 R _registers; 1264 unw_proc_info_t _info; 1265 bool _unwindInfoMissing; 1266 bool _isSignalFrame; 1267 #if defined(_LIBUNWIND_TARGET_LINUX) && (defined(_LIBUNWIND_TARGET_AARCH64) || defined(_LIBUNWIND_TARGET_S390X)) 1268 bool _isSigReturn = false; 1269 #endif 1270 }; 1271 1272 1273 template <typename A, typename R> 1274 UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as) 1275 : _addressSpace(as), _registers(context), _unwindInfoMissing(false), 1276 _isSignalFrame(false) { 1277 static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), 1278 "UnwindCursor<> does not fit in unw_cursor_t"); 1279 static_assert((alignof(UnwindCursor<A, R>) <= alignof(unw_cursor_t)), 1280 "UnwindCursor<> requires more alignment than unw_cursor_t"); 1281 memset(&_info, 0, sizeof(_info)); 1282 } 1283 1284 template <typename A, typename R> 1285 UnwindCursor<A, R>::UnwindCursor(A &as, void *) 1286 : _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) { 1287 memset(&_info, 0, sizeof(_info)); 1288 // FIXME 1289 // fill in _registers from thread arg 1290 } 1291 1292 1293 template <typename A, typename R> 1294 bool UnwindCursor<A, R>::validReg(int regNum) { 1295 return _registers.validRegister(regNum); 1296 } 1297 1298 template <typename A, typename R> 1299 unw_word_t UnwindCursor<A, R>::getReg(int regNum) { 1300 return _registers.getRegister(regNum); 1301 } 1302 1303 template <typename A, typename R> 1304 void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) { 1305 _registers.setRegister(regNum, (typename A::pint_t)value); 1306 } 1307 1308 template <typename A, typename R> 1309 bool UnwindCursor<A, R>::validFloatReg(int regNum) { 1310 return _registers.validFloatRegister(regNum); 1311 } 1312 1313 template <typename A, typename R> 1314 unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) { 1315 return _registers.getFloatRegister(regNum); 1316 } 1317 1318 template <typename A, typename R> 1319 void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) { 1320 _registers.setFloatRegister(regNum, value); 1321 } 1322 1323 template <typename A, typename R> void UnwindCursor<A, R>::jumpto() { 1324 _registers.jumpto(); 1325 } 1326 1327 #ifdef __arm__ 1328 template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() { 1329 _registers.saveVFPAsX(); 1330 } 1331 #endif 1332 1333 #ifdef _AIX 1334 template <typename A, typename R> 1335 uintptr_t UnwindCursor<A, R>::getDataRelBase() { 1336 return reinterpret_cast<uintptr_t>(_info.extra); 1337 } 1338 #endif 1339 1340 template <typename A, typename R> 1341 const char *UnwindCursor<A, R>::getRegisterName(int regNum) { 1342 return _registers.getRegisterName(regNum); 1343 } 1344 1345 template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() { 1346 return _isSignalFrame; 1347 } 1348 1349 #endif // defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1350 1351 #if defined(_LIBUNWIND_ARM_EHABI) 1352 template<typename A> 1353 struct EHABISectionIterator { 1354 typedef EHABISectionIterator _Self; 1355 1356 typedef typename A::pint_t value_type; 1357 typedef typename A::pint_t* pointer; 1358 typedef typename A::pint_t& reference; 1359 typedef size_t size_type; 1360 typedef size_t difference_type; 1361 1362 static _Self begin(A& addressSpace, const UnwindInfoSections& sects) { 1363 return _Self(addressSpace, sects, 0); 1364 } 1365 static _Self end(A& addressSpace, const UnwindInfoSections& sects) { 1366 return _Self(addressSpace, sects, 1367 sects.arm_section_length / sizeof(EHABIIndexEntry)); 1368 } 1369 1370 EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i) 1371 : _i(i), _addressSpace(&addressSpace), _sects(§s) {} 1372 1373 _Self& operator++() { ++_i; return *this; } 1374 _Self& operator+=(size_t a) { _i += a; return *this; } 1375 _Self& operator--() { assert(_i > 0); --_i; return *this; } 1376 _Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; } 1377 1378 _Self operator+(size_t a) { _Self out = *this; out._i += a; return out; } 1379 _Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; } 1380 1381 size_t operator-(const _Self& other) const { return _i - other._i; } 1382 1383 bool operator==(const _Self& other) const { 1384 assert(_addressSpace == other._addressSpace); 1385 assert(_sects == other._sects); 1386 return _i == other._i; 1387 } 1388 1389 bool operator!=(const _Self& other) const { 1390 assert(_addressSpace == other._addressSpace); 1391 assert(_sects == other._sects); 1392 return _i != other._i; 1393 } 1394 1395 typename A::pint_t operator*() const { return functionAddress(); } 1396 1397 typename A::pint_t functionAddress() const { 1398 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( 1399 EHABIIndexEntry, _i, functionOffset); 1400 return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr)); 1401 } 1402 1403 typename A::pint_t dataAddress() { 1404 typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( 1405 EHABIIndexEntry, _i, data); 1406 return indexAddr; 1407 } 1408 1409 private: 1410 size_t _i; 1411 A* _addressSpace; 1412 const UnwindInfoSections* _sects; 1413 }; 1414 1415 namespace { 1416 1417 template <typename A> 1418 EHABISectionIterator<A> EHABISectionUpperBound( 1419 EHABISectionIterator<A> first, 1420 EHABISectionIterator<A> last, 1421 typename A::pint_t value) { 1422 size_t len = last - first; 1423 while (len > 0) { 1424 size_t l2 = len / 2; 1425 EHABISectionIterator<A> m = first + l2; 1426 if (value < *m) { 1427 len = l2; 1428 } else { 1429 first = ++m; 1430 len -= l2 + 1; 1431 } 1432 } 1433 return first; 1434 } 1435 1436 } 1437 1438 template <typename A, typename R> 1439 bool UnwindCursor<A, R>::getInfoFromEHABISection( 1440 pint_t pc, 1441 const UnwindInfoSections §s) { 1442 EHABISectionIterator<A> begin = 1443 EHABISectionIterator<A>::begin(_addressSpace, sects); 1444 EHABISectionIterator<A> end = 1445 EHABISectionIterator<A>::end(_addressSpace, sects); 1446 if (begin == end) 1447 return false; 1448 1449 EHABISectionIterator<A> itNextPC = EHABISectionUpperBound(begin, end, pc); 1450 if (itNextPC == begin) 1451 return false; 1452 EHABISectionIterator<A> itThisPC = itNextPC - 1; 1453 1454 pint_t thisPC = itThisPC.functionAddress(); 1455 // If an exception is thrown from a function, corresponding to the last entry 1456 // in the table, we don't really know the function extent and have to choose a 1457 // value for nextPC. Choosing max() will allow the range check during trace to 1458 // succeed. 1459 pint_t nextPC = (itNextPC == end) ? UINTPTR_MAX : itNextPC.functionAddress(); 1460 pint_t indexDataAddr = itThisPC.dataAddress(); 1461 1462 if (indexDataAddr == 0) 1463 return false; 1464 1465 uint32_t indexData = _addressSpace.get32(indexDataAddr); 1466 if (indexData == UNW_EXIDX_CANTUNWIND) 1467 return false; 1468 1469 // If the high bit is set, the exception handling table entry is inline inside 1470 // the index table entry on the second word (aka |indexDataAddr|). Otherwise, 1471 // the table points at an offset in the exception handling table (section 5 1472 // EHABI). 1473 pint_t exceptionTableAddr; 1474 uint32_t exceptionTableData; 1475 bool isSingleWordEHT; 1476 if (indexData & 0x80000000) { 1477 exceptionTableAddr = indexDataAddr; 1478 // TODO(ajwong): Should this data be 0? 1479 exceptionTableData = indexData; 1480 isSingleWordEHT = true; 1481 } else { 1482 exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData); 1483 exceptionTableData = _addressSpace.get32(exceptionTableAddr); 1484 isSingleWordEHT = false; 1485 } 1486 1487 // Now we know the 3 things: 1488 // exceptionTableAddr -- exception handler table entry. 1489 // exceptionTableData -- the data inside the first word of the eht entry. 1490 // isSingleWordEHT -- whether the entry is in the index. 1491 unw_word_t personalityRoutine = 0xbadf00d; 1492 bool scope32 = false; 1493 uintptr_t lsda; 1494 1495 // If the high bit in the exception handling table entry is set, the entry is 1496 // in compact form (section 6.3 EHABI). 1497 if (exceptionTableData & 0x80000000) { 1498 // Grab the index of the personality routine from the compact form. 1499 uint32_t choice = (exceptionTableData & 0x0f000000) >> 24; 1500 uint32_t extraWords = 0; 1501 switch (choice) { 1502 case 0: 1503 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0; 1504 extraWords = 0; 1505 scope32 = false; 1506 lsda = isSingleWordEHT ? 0 : (exceptionTableAddr + 4); 1507 break; 1508 case 1: 1509 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1; 1510 extraWords = (exceptionTableData & 0x00ff0000) >> 16; 1511 scope32 = false; 1512 lsda = exceptionTableAddr + (extraWords + 1) * 4; 1513 break; 1514 case 2: 1515 personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2; 1516 extraWords = (exceptionTableData & 0x00ff0000) >> 16; 1517 scope32 = true; 1518 lsda = exceptionTableAddr + (extraWords + 1) * 4; 1519 break; 1520 default: 1521 _LIBUNWIND_ABORT("unknown personality routine"); 1522 return false; 1523 } 1524 1525 if (isSingleWordEHT) { 1526 if (extraWords != 0) { 1527 _LIBUNWIND_ABORT("index inlined table detected but pr function " 1528 "requires extra words"); 1529 return false; 1530 } 1531 } 1532 } else { 1533 pint_t personalityAddr = 1534 exceptionTableAddr + signExtendPrel31(exceptionTableData); 1535 personalityRoutine = personalityAddr; 1536 1537 // ARM EHABI # 6.2, # 9.2 1538 // 1539 // +---- ehtp 1540 // v 1541 // +--------------------------------------+ 1542 // | +--------+--------+--------+-------+ | 1543 // | |0| prel31 to personalityRoutine | | 1544 // | +--------+--------+--------+-------+ | 1545 // | | N | unwind opcodes | | <-- UnwindData 1546 // | +--------+--------+--------+-------+ | 1547 // | | Word 2 unwind opcodes | | 1548 // | +--------+--------+--------+-------+ | 1549 // | ... | 1550 // | +--------+--------+--------+-------+ | 1551 // | | Word N unwind opcodes | | 1552 // | +--------+--------+--------+-------+ | 1553 // | | LSDA | | <-- lsda 1554 // | | ... | | 1555 // | +--------+--------+--------+-------+ | 1556 // +--------------------------------------+ 1557 1558 uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1; 1559 uint32_t FirstDataWord = *UnwindData; 1560 size_t N = ((FirstDataWord >> 24) & 0xff); 1561 size_t NDataWords = N + 1; 1562 lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords); 1563 } 1564 1565 _info.start_ip = thisPC; 1566 _info.end_ip = nextPC; 1567 _info.handler = personalityRoutine; 1568 _info.unwind_info = exceptionTableAddr; 1569 _info.lsda = lsda; 1570 // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0. 1571 _info.flags = (isSingleWordEHT ? 1 : 0) | (scope32 ? 0x2 : 0); // Use enum? 1572 1573 return true; 1574 } 1575 #endif 1576 1577 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1578 template <typename A, typename R> 1579 bool UnwindCursor<A, R>::getInfoFromFdeCie( 1580 const typename CFI_Parser<A>::FDE_Info &fdeInfo, 1581 const typename CFI_Parser<A>::CIE_Info &cieInfo, pint_t pc, 1582 uintptr_t dso_base) { 1583 typename CFI_Parser<A>::PrologInfo prolog; 1584 if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc, 1585 R::getArch(), &prolog)) { 1586 // Save off parsed FDE info 1587 _info.start_ip = fdeInfo.pcStart; 1588 _info.end_ip = fdeInfo.pcEnd; 1589 _info.lsda = fdeInfo.lsda; 1590 _info.handler = cieInfo.personality; 1591 // Some frameless functions need SP altered when resuming in function, so 1592 // propagate spExtraArgSize. 1593 _info.gp = prolog.spExtraArgSize; 1594 _info.flags = 0; 1595 _info.format = dwarfEncoding(); 1596 _info.unwind_info = fdeInfo.fdeStart; 1597 _info.unwind_info_size = static_cast<uint32_t>(fdeInfo.fdeLength); 1598 _info.extra = static_cast<unw_word_t>(dso_base); 1599 return true; 1600 } 1601 return false; 1602 } 1603 1604 template <typename A, typename R> 1605 bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc, 1606 const UnwindInfoSections §s, 1607 uint32_t fdeSectionOffsetHint) { 1608 typename CFI_Parser<A>::FDE_Info fdeInfo; 1609 typename CFI_Parser<A>::CIE_Info cieInfo; 1610 bool foundFDE = false; 1611 bool foundInCache = false; 1612 // If compact encoding table gave offset into dwarf section, go directly there 1613 if (fdeSectionOffsetHint != 0) { 1614 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1615 sects.dwarf_section_length, 1616 sects.dwarf_section + fdeSectionOffsetHint, 1617 &fdeInfo, &cieInfo); 1618 } 1619 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) 1620 if (!foundFDE && (sects.dwarf_index_section != 0)) { 1621 foundFDE = EHHeaderParser<A>::findFDE( 1622 _addressSpace, pc, sects.dwarf_index_section, 1623 (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo); 1624 } 1625 #endif 1626 if (!foundFDE) { 1627 // otherwise, search cache of previously found FDEs. 1628 pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc); 1629 if (cachedFDE != 0) { 1630 foundFDE = 1631 CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1632 sects.dwarf_section_length, 1633 cachedFDE, &fdeInfo, &cieInfo); 1634 foundInCache = foundFDE; 1635 } 1636 } 1637 if (!foundFDE) { 1638 // Still not found, do full scan of __eh_frame section. 1639 foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, 1640 sects.dwarf_section_length, 0, 1641 &fdeInfo, &cieInfo); 1642 } 1643 if (foundFDE) { 1644 if (getInfoFromFdeCie(fdeInfo, cieInfo, pc, sects.dso_base)) { 1645 // Add to cache (to make next lookup faster) if we had no hint 1646 // and there was no index. 1647 if (!foundInCache && (fdeSectionOffsetHint == 0)) { 1648 #if defined(_LIBUNWIND_SUPPORT_DWARF_INDEX) 1649 if (sects.dwarf_index_section == 0) 1650 #endif 1651 DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd, 1652 fdeInfo.fdeStart); 1653 } 1654 return true; 1655 } 1656 } 1657 //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc); 1658 return false; 1659 } 1660 #endif // defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 1661 1662 1663 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1664 template <typename A, typename R> 1665 bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc, 1666 const UnwindInfoSections §s) { 1667 const bool log = false; 1668 if (log) 1669 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n", 1670 (uint64_t)pc, (uint64_t)sects.dso_base); 1671 1672 const UnwindSectionHeader<A> sectionHeader(_addressSpace, 1673 sects.compact_unwind_section); 1674 if (sectionHeader.version() != UNWIND_SECTION_VERSION) 1675 return false; 1676 1677 // do a binary search of top level index to find page with unwind info 1678 pint_t targetFunctionOffset = pc - sects.dso_base; 1679 const UnwindSectionIndexArray<A> topIndex(_addressSpace, 1680 sects.compact_unwind_section 1681 + sectionHeader.indexSectionOffset()); 1682 uint32_t low = 0; 1683 uint32_t high = sectionHeader.indexCount(); 1684 uint32_t last = high - 1; 1685 while (low < high) { 1686 uint32_t mid = (low + high) / 2; 1687 //if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n", 1688 //mid, low, high, topIndex.functionOffset(mid)); 1689 if (topIndex.functionOffset(mid) <= targetFunctionOffset) { 1690 if ((mid == last) || 1691 (topIndex.functionOffset(mid + 1) > targetFunctionOffset)) { 1692 low = mid; 1693 break; 1694 } else { 1695 low = mid + 1; 1696 } 1697 } else { 1698 high = mid; 1699 } 1700 } 1701 const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low); 1702 const uint32_t firstLevelNextPageFunctionOffset = 1703 topIndex.functionOffset(low + 1); 1704 const pint_t secondLevelAddr = 1705 sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low); 1706 const pint_t lsdaArrayStartAddr = 1707 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low); 1708 const pint_t lsdaArrayEndAddr = 1709 sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1); 1710 if (log) 1711 fprintf(stderr, "\tfirst level search for result index=%d " 1712 "to secondLevelAddr=0x%llX\n", 1713 low, (uint64_t) secondLevelAddr); 1714 // do a binary search of second level page index 1715 uint32_t encoding = 0; 1716 pint_t funcStart = 0; 1717 pint_t funcEnd = 0; 1718 pint_t lsda = 0; 1719 pint_t personality = 0; 1720 uint32_t pageKind = _addressSpace.get32(secondLevelAddr); 1721 if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) { 1722 // regular page 1723 UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace, 1724 secondLevelAddr); 1725 UnwindSectionRegularArray<A> pageIndex( 1726 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); 1727 // binary search looks for entry with e where index[e].offset <= pc < 1728 // index[e+1].offset 1729 if (log) 1730 fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in " 1731 "regular page starting at secondLevelAddr=0x%llX\n", 1732 (uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr); 1733 low = 0; 1734 high = pageHeader.entryCount(); 1735 while (low < high) { 1736 uint32_t mid = (low + high) / 2; 1737 if (pageIndex.functionOffset(mid) <= targetFunctionOffset) { 1738 if (mid == (uint32_t)(pageHeader.entryCount() - 1)) { 1739 // at end of table 1740 low = mid; 1741 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; 1742 break; 1743 } else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) { 1744 // next is too big, so we found it 1745 low = mid; 1746 funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base; 1747 break; 1748 } else { 1749 low = mid + 1; 1750 } 1751 } else { 1752 high = mid; 1753 } 1754 } 1755 encoding = pageIndex.encoding(low); 1756 funcStart = pageIndex.functionOffset(low) + sects.dso_base; 1757 if (pc < funcStart) { 1758 if (log) 1759 fprintf( 1760 stderr, 1761 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", 1762 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); 1763 return false; 1764 } 1765 if (pc > funcEnd) { 1766 if (log) 1767 fprintf( 1768 stderr, 1769 "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", 1770 (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); 1771 return false; 1772 } 1773 } else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) { 1774 // compressed page 1775 UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace, 1776 secondLevelAddr); 1777 UnwindSectionCompressedArray<A> pageIndex( 1778 _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); 1779 const uint32_t targetFunctionPageOffset = 1780 (uint32_t)(targetFunctionOffset - firstLevelFunctionOffset); 1781 // binary search looks for entry with e where index[e].offset <= pc < 1782 // index[e+1].offset 1783 if (log) 1784 fprintf(stderr, "\tbinary search of compressed page starting at " 1785 "secondLevelAddr=0x%llX\n", 1786 (uint64_t) secondLevelAddr); 1787 low = 0; 1788 last = pageHeader.entryCount() - 1; 1789 high = pageHeader.entryCount(); 1790 while (low < high) { 1791 uint32_t mid = (low + high) / 2; 1792 if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) { 1793 if ((mid == last) || 1794 (pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) { 1795 low = mid; 1796 break; 1797 } else { 1798 low = mid + 1; 1799 } 1800 } else { 1801 high = mid; 1802 } 1803 } 1804 funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset 1805 + sects.dso_base; 1806 if (low < last) 1807 funcEnd = 1808 pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset 1809 + sects.dso_base; 1810 else 1811 funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; 1812 if (pc < funcStart) { 1813 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX " 1814 "not in second level compressed unwind table. " 1815 "funcStart=0x%llX", 1816 (uint64_t) pc, (uint64_t) funcStart); 1817 return false; 1818 } 1819 if (pc > funcEnd) { 1820 _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX " 1821 "not in second level compressed unwind table. " 1822 "funcEnd=0x%llX", 1823 (uint64_t) pc, (uint64_t) funcEnd); 1824 return false; 1825 } 1826 uint16_t encodingIndex = pageIndex.encodingIndex(low); 1827 if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) { 1828 // encoding is in common table in section header 1829 encoding = _addressSpace.get32( 1830 sects.compact_unwind_section + 1831 sectionHeader.commonEncodingsArraySectionOffset() + 1832 encodingIndex * sizeof(uint32_t)); 1833 } else { 1834 // encoding is in page specific table 1835 uint16_t pageEncodingIndex = 1836 encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount(); 1837 encoding = _addressSpace.get32(secondLevelAddr + 1838 pageHeader.encodingsPageOffset() + 1839 pageEncodingIndex * sizeof(uint32_t)); 1840 } 1841 } else { 1842 _LIBUNWIND_DEBUG_LOG( 1843 "malformed __unwind_info at 0x%0llX bad second level page", 1844 (uint64_t)sects.compact_unwind_section); 1845 return false; 1846 } 1847 1848 // look up LSDA, if encoding says function has one 1849 if (encoding & UNWIND_HAS_LSDA) { 1850 UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr); 1851 uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base); 1852 low = 0; 1853 high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) / 1854 sizeof(unwind_info_section_header_lsda_index_entry); 1855 // binary search looks for entry with exact match for functionOffset 1856 if (log) 1857 fprintf(stderr, 1858 "\tbinary search of lsda table for targetFunctionOffset=0x%08X\n", 1859 funcStartOffset); 1860 while (low < high) { 1861 uint32_t mid = (low + high) / 2; 1862 if (lsdaIndex.functionOffset(mid) == funcStartOffset) { 1863 lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base; 1864 break; 1865 } else if (lsdaIndex.functionOffset(mid) < funcStartOffset) { 1866 low = mid + 1; 1867 } else { 1868 high = mid; 1869 } 1870 } 1871 if (lsda == 0) { 1872 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for " 1873 "pc=0x%0llX, but lsda table has no entry", 1874 encoding, (uint64_t) pc); 1875 return false; 1876 } 1877 } 1878 1879 // extract personality routine, if encoding says function has one 1880 uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >> 1881 (__builtin_ctz(UNWIND_PERSONALITY_MASK)); 1882 if (personalityIndex != 0) { 1883 --personalityIndex; // change 1-based to zero-based index 1884 if (personalityIndex >= sectionHeader.personalityArrayCount()) { 1885 _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, " 1886 "but personality table has only %d entries", 1887 encoding, personalityIndex, 1888 sectionHeader.personalityArrayCount()); 1889 return false; 1890 } 1891 int32_t personalityDelta = (int32_t)_addressSpace.get32( 1892 sects.compact_unwind_section + 1893 sectionHeader.personalityArraySectionOffset() + 1894 personalityIndex * sizeof(uint32_t)); 1895 pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta; 1896 personality = _addressSpace.getP(personalityPointer); 1897 if (log) 1898 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " 1899 "personalityDelta=0x%08X, personality=0x%08llX\n", 1900 (uint64_t) pc, personalityDelta, (uint64_t) personality); 1901 } 1902 1903 if (log) 1904 fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " 1905 "encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n", 1906 (uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart); 1907 _info.start_ip = funcStart; 1908 _info.end_ip = funcEnd; 1909 _info.lsda = lsda; 1910 _info.handler = personality; 1911 _info.gp = 0; 1912 _info.flags = 0; 1913 _info.format = encoding; 1914 _info.unwind_info = 0; 1915 _info.unwind_info_size = 0; 1916 _info.extra = sects.dso_base; 1917 return true; 1918 } 1919 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 1920 1921 1922 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 1923 template <typename A, typename R> 1924 bool UnwindCursor<A, R>::getInfoFromSEH(pint_t pc) { 1925 pint_t base; 1926 RUNTIME_FUNCTION *unwindEntry = lookUpSEHUnwindInfo(pc, &base); 1927 if (!unwindEntry) { 1928 _LIBUNWIND_DEBUG_LOG("\tpc not in table, pc=0x%llX", (uint64_t) pc); 1929 return false; 1930 } 1931 _info.gp = 0; 1932 _info.flags = 0; 1933 _info.format = 0; 1934 _info.unwind_info_size = sizeof(RUNTIME_FUNCTION); 1935 _info.unwind_info = reinterpret_cast<unw_word_t>(unwindEntry); 1936 _info.extra = base; 1937 _info.start_ip = base + unwindEntry->BeginAddress; 1938 #ifdef _LIBUNWIND_TARGET_X86_64 1939 _info.end_ip = base + unwindEntry->EndAddress; 1940 // Only fill in the handler and LSDA if they're stale. 1941 if (pc != getLastPC()) { 1942 UNWIND_INFO *xdata = reinterpret_cast<UNWIND_INFO *>(base + unwindEntry->UnwindData); 1943 if (xdata->Flags & (UNW_FLAG_EHANDLER|UNW_FLAG_UHANDLER)) { 1944 // The personality is given in the UNWIND_INFO itself. The LSDA immediately 1945 // follows the UNWIND_INFO. (This follows how both Clang and MSVC emit 1946 // these structures.) 1947 // N.B. UNWIND_INFO structs are DWORD-aligned. 1948 uint32_t lastcode = (xdata->CountOfCodes + 1) & ~1; 1949 const uint32_t *handler = reinterpret_cast<uint32_t *>(&xdata->UnwindCodes[lastcode]); 1950 _info.lsda = reinterpret_cast<unw_word_t>(handler+1); 1951 if (*handler) { 1952 _info.handler = reinterpret_cast<unw_word_t>(__libunwind_seh_personality); 1953 } else 1954 _info.handler = 0; 1955 } else { 1956 _info.lsda = 0; 1957 _info.handler = 0; 1958 } 1959 } 1960 #elif defined(_LIBUNWIND_TARGET_ARM) 1961 _info.end_ip = _info.start_ip + unwindEntry->FunctionLength; 1962 _info.lsda = 0; // FIXME 1963 _info.handler = 0; // FIXME 1964 #endif 1965 setLastPC(pc); 1966 return true; 1967 } 1968 #endif 1969 1970 #if defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 1971 // Masks for traceback table field xtbtable. 1972 enum xTBTableMask : uint8_t { 1973 reservedBit = 0x02, // The traceback table was incorrectly generated if set 1974 // (see comments in function getInfoFromTBTable(). 1975 ehInfoBit = 0x08 // Exception handling info is present if set 1976 }; 1977 1978 enum frameType : unw_word_t { 1979 frameWithXLEHStateTable = 0, 1980 frameWithEHInfo = 1 1981 }; 1982 1983 extern "C" { 1984 typedef _Unwind_Reason_Code __xlcxx_personality_v0_t(int, _Unwind_Action, 1985 uint64_t, 1986 _Unwind_Exception *, 1987 struct _Unwind_Context *); 1988 __attribute__((__weak__)) __xlcxx_personality_v0_t __xlcxx_personality_v0; 1989 } 1990 1991 static __xlcxx_personality_v0_t *xlcPersonalityV0; 1992 static RWMutex xlcPersonalityV0InitLock; 1993 1994 template <typename A, typename R> 1995 bool UnwindCursor<A, R>::getInfoFromTBTable(pint_t pc, R ®isters) { 1996 uint32_t *p = reinterpret_cast<uint32_t *>(pc); 1997 1998 // Keep looking forward until a word of 0 is found. The traceback 1999 // table starts at the following word. 2000 while (*p) 2001 ++p; 2002 tbtable *TBTable = reinterpret_cast<tbtable *>(p + 1); 2003 2004 if (_LIBUNWIND_TRACING_UNWINDING) { 2005 char functionBuf[512]; 2006 const char *functionName = functionBuf; 2007 unw_word_t offset; 2008 if (!getFunctionName(functionBuf, sizeof(functionBuf), &offset)) { 2009 functionName = ".anonymous."; 2010 } 2011 _LIBUNWIND_TRACE_UNWINDING("%s: Look up traceback table of func=%s at %p", 2012 __func__, functionName, 2013 reinterpret_cast<void *>(TBTable)); 2014 } 2015 2016 // If the traceback table does not contain necessary info, bypass this frame. 2017 if (!TBTable->tb.has_tboff) 2018 return false; 2019 2020 // Structure tbtable_ext contains important data we are looking for. 2021 p = reinterpret_cast<uint32_t *>(&TBTable->tb_ext); 2022 2023 // Skip field parminfo if it exists. 2024 if (TBTable->tb.fixedparms || TBTable->tb.floatparms) 2025 ++p; 2026 2027 // p now points to tb_offset, the offset from start of function to TB table. 2028 unw_word_t start_ip = 2029 reinterpret_cast<unw_word_t>(TBTable) - *p - sizeof(uint32_t); 2030 unw_word_t end_ip = reinterpret_cast<unw_word_t>(TBTable); 2031 ++p; 2032 2033 _LIBUNWIND_TRACE_UNWINDING("start_ip=%p, end_ip=%p\n", 2034 reinterpret_cast<void *>(start_ip), 2035 reinterpret_cast<void *>(end_ip)); 2036 2037 // Skip field hand_mask if it exists. 2038 if (TBTable->tb.int_hndl) 2039 ++p; 2040 2041 unw_word_t lsda = 0; 2042 unw_word_t handler = 0; 2043 unw_word_t flags = frameType::frameWithXLEHStateTable; 2044 2045 if (TBTable->tb.lang == TB_CPLUSPLUS && TBTable->tb.has_ctl) { 2046 // State table info is available. The ctl_info field indicates the 2047 // number of CTL anchors. There should be only one entry for the C++ 2048 // state table. 2049 assert(*p == 1 && "libunwind: there must be only one ctl_info entry"); 2050 ++p; 2051 // p points to the offset of the state table into the stack. 2052 pint_t stateTableOffset = *p++; 2053 2054 int framePointerReg; 2055 2056 // Skip fields name_len and name if exist. 2057 if (TBTable->tb.name_present) { 2058 const uint16_t name_len = *(reinterpret_cast<uint16_t *>(p)); 2059 p = reinterpret_cast<uint32_t *>(reinterpret_cast<char *>(p) + name_len + 2060 sizeof(uint16_t)); 2061 } 2062 2063 if (TBTable->tb.uses_alloca) 2064 framePointerReg = *(reinterpret_cast<char *>(p)); 2065 else 2066 framePointerReg = 1; // default frame pointer == SP 2067 2068 _LIBUNWIND_TRACE_UNWINDING( 2069 "framePointerReg=%d, framePointer=%p, " 2070 "stateTableOffset=%#lx\n", 2071 framePointerReg, 2072 reinterpret_cast<void *>(_registers.getRegister(framePointerReg)), 2073 stateTableOffset); 2074 lsda = _registers.getRegister(framePointerReg) + stateTableOffset; 2075 2076 // Since the traceback table generated by the legacy XLC++ does not 2077 // provide the location of the personality for the state table, 2078 // function __xlcxx_personality_v0(), which is the personality for the state 2079 // table and is exported from libc++abi, is directly assigned as the 2080 // handler here. When a legacy XLC++ frame is encountered, the symbol 2081 // is resolved dynamically using dlopen() to avoid hard dependency from 2082 // libunwind on libc++abi. 2083 2084 // Resolve the function pointer to the state table personality if it has 2085 // not already. 2086 if (xlcPersonalityV0 == NULL) { 2087 xlcPersonalityV0InitLock.lock(); 2088 if (xlcPersonalityV0 == NULL) { 2089 // If libc++abi is statically linked in, symbol __xlcxx_personality_v0 2090 // has been resolved at the link time. 2091 xlcPersonalityV0 = &__xlcxx_personality_v0; 2092 if (xlcPersonalityV0 == NULL) { 2093 // libc++abi is dynamically linked. Resolve __xlcxx_personality_v0 2094 // using dlopen(). 2095 const char libcxxabi[] = "libc++abi.a(libc++abi.so.1)"; 2096 void *libHandle; 2097 libHandle = dlopen(libcxxabi, RTLD_MEMBER | RTLD_NOW); 2098 if (libHandle == NULL) { 2099 _LIBUNWIND_TRACE_UNWINDING("dlopen() failed with errno=%d\n", 2100 errno); 2101 assert(0 && "dlopen() failed"); 2102 } 2103 xlcPersonalityV0 = reinterpret_cast<__xlcxx_personality_v0_t *>( 2104 dlsym(libHandle, "__xlcxx_personality_v0")); 2105 if (xlcPersonalityV0 == NULL) { 2106 _LIBUNWIND_TRACE_UNWINDING("dlsym() failed with errno=%d\n", errno); 2107 assert(0 && "dlsym() failed"); 2108 } 2109 dlclose(libHandle); 2110 } 2111 } 2112 xlcPersonalityV0InitLock.unlock(); 2113 } 2114 handler = reinterpret_cast<unw_word_t>(xlcPersonalityV0); 2115 _LIBUNWIND_TRACE_UNWINDING("State table: LSDA=%p, Personality=%p\n", 2116 reinterpret_cast<void *>(lsda), 2117 reinterpret_cast<void *>(handler)); 2118 } else if (TBTable->tb.longtbtable) { 2119 // This frame has the traceback table extension. Possible cases are 2120 // 1) a C++ frame that has the 'eh_info' structure; 2) a C++ frame that 2121 // is not EH aware; or, 3) a frame of other languages. We need to figure out 2122 // if the traceback table extension contains the 'eh_info' structure. 2123 // 2124 // We also need to deal with the complexity arising from some XL compiler 2125 // versions use the wrong ordering of 'longtbtable' and 'has_vec' bits 2126 // where the 'longtbtable' bit is meant to be the 'has_vec' bit and vice 2127 // versa. For frames of code generated by those compilers, the 'longtbtable' 2128 // bit may be set but there isn't really a traceback table extension. 2129 // 2130 // In </usr/include/sys/debug.h>, there is the following definition of 2131 // 'struct tbtable_ext'. It is not really a structure but a dummy to 2132 // collect the description of optional parts of the traceback table. 2133 // 2134 // struct tbtable_ext { 2135 // ... 2136 // char alloca_reg; /* Register for alloca automatic storage */ 2137 // struct vec_ext vec_ext; /* Vector extension (if has_vec is set) */ 2138 // unsigned char xtbtable; /* More tbtable fields, if longtbtable is set*/ 2139 // }; 2140 // 2141 // Depending on how the 'has_vec'/'longtbtable' bit is interpreted, the data 2142 // following 'alloca_reg' can be treated either as 'struct vec_ext' or 2143 // 'unsigned char xtbtable'. 'xtbtable' bits are defined in 2144 // </usr/include/sys/debug.h> as flags. The 7th bit '0x02' is currently 2145 // unused and should not be set. 'struct vec_ext' is defined in 2146 // </usr/include/sys/debug.h> as follows: 2147 // 2148 // struct vec_ext { 2149 // unsigned vr_saved:6; /* Number of non-volatile vector regs saved 2150 // */ 2151 // /* first register saved is assumed to be */ 2152 // /* 32 - vr_saved */ 2153 // unsigned saves_vrsave:1; /* Set if vrsave is saved on the stack */ 2154 // unsigned has_varargs:1; 2155 // ... 2156 // }; 2157 // 2158 // Here, the 7th bit is used as 'saves_vrsave'. To determine whether it 2159 // is 'struct vec_ext' or 'xtbtable' that follows 'alloca_reg', 2160 // we checks if the 7th bit is set or not because 'xtbtable' should 2161 // never have the 7th bit set. The 7th bit of 'xtbtable' will be reserved 2162 // in the future to make sure the mitigation works. This mitigation 2163 // is not 100% bullet proof because 'struct vec_ext' may not always have 2164 // 'saves_vrsave' bit set. 2165 // 2166 // 'reservedBit' is defined in enum 'xTBTableMask' above as the mask for 2167 // checking the 7th bit. 2168 2169 // p points to field name len. 2170 uint8_t *charPtr = reinterpret_cast<uint8_t *>(p); 2171 2172 // Skip fields name_len and name if they exist. 2173 if (TBTable->tb.name_present) { 2174 const uint16_t name_len = *(reinterpret_cast<uint16_t *>(charPtr)); 2175 charPtr = charPtr + name_len + sizeof(uint16_t); 2176 } 2177 2178 // Skip field alloc_reg if it exists. 2179 if (TBTable->tb.uses_alloca) 2180 ++charPtr; 2181 2182 // Check traceback table bit has_vec. Skip struct vec_ext if it exists. 2183 if (TBTable->tb.has_vec) 2184 // Note struct vec_ext does exist at this point because whether the 2185 // ordering of longtbtable and has_vec bits is correct or not, both 2186 // are set. 2187 charPtr += sizeof(struct vec_ext); 2188 2189 // charPtr points to field 'xtbtable'. Check if the EH info is available. 2190 // Also check if the reserved bit of the extended traceback table field 2191 // 'xtbtable' is set. If it is, the traceback table was incorrectly 2192 // generated by an XL compiler that uses the wrong ordering of 'longtbtable' 2193 // and 'has_vec' bits and this is in fact 'struct vec_ext'. So skip the 2194 // frame. 2195 if ((*charPtr & xTBTableMask::ehInfoBit) && 2196 !(*charPtr & xTBTableMask::reservedBit)) { 2197 // Mark this frame has the new EH info. 2198 flags = frameType::frameWithEHInfo; 2199 2200 // eh_info is available. 2201 charPtr++; 2202 // The pointer is 4-byte aligned. 2203 if (reinterpret_cast<uintptr_t>(charPtr) % 4) 2204 charPtr += 4 - reinterpret_cast<uintptr_t>(charPtr) % 4; 2205 uintptr_t *ehInfo = 2206 reinterpret_cast<uintptr_t *>(*(reinterpret_cast<uintptr_t *>( 2207 registers.getRegister(2) + 2208 *(reinterpret_cast<uintptr_t *>(charPtr))))); 2209 2210 // ehInfo points to structure en_info. The first member is version. 2211 // Only version 0 is currently supported. 2212 assert(*(reinterpret_cast<uint32_t *>(ehInfo)) == 0 && 2213 "libunwind: ehInfo version other than 0 is not supported"); 2214 2215 // Increment ehInfo to point to member lsda. 2216 ++ehInfo; 2217 lsda = *ehInfo++; 2218 2219 // enInfo now points to member personality. 2220 handler = *ehInfo; 2221 2222 _LIBUNWIND_TRACE_UNWINDING("Range table: LSDA=%#lx, Personality=%#lx\n", 2223 lsda, handler); 2224 } 2225 } 2226 2227 _info.start_ip = start_ip; 2228 _info.end_ip = end_ip; 2229 _info.lsda = lsda; 2230 _info.handler = handler; 2231 _info.gp = 0; 2232 _info.flags = flags; 2233 _info.format = 0; 2234 _info.unwind_info = reinterpret_cast<unw_word_t>(TBTable); 2235 _info.unwind_info_size = 0; 2236 _info.extra = registers.getRegister(2); 2237 2238 return true; 2239 } 2240 2241 // Step back up the stack following the frame back link. 2242 template <typename A, typename R> 2243 int UnwindCursor<A, R>::stepWithTBTable(pint_t pc, tbtable *TBTable, 2244 R ®isters, bool &isSignalFrame) { 2245 if (_LIBUNWIND_TRACING_UNWINDING) { 2246 char functionBuf[512]; 2247 const char *functionName = functionBuf; 2248 unw_word_t offset; 2249 if (!getFunctionName(functionBuf, sizeof(functionBuf), &offset)) { 2250 functionName = ".anonymous."; 2251 } 2252 _LIBUNWIND_TRACE_UNWINDING("%s: Look up traceback table of func=%s at %p", 2253 __func__, functionName, 2254 reinterpret_cast<void *>(TBTable)); 2255 } 2256 2257 #if defined(__powerpc64__) 2258 // Instruction to reload TOC register "l r2,40(r1)" 2259 const uint32_t loadTOCRegInst = 0xe8410028; 2260 const int32_t unwPPCF0Index = UNW_PPC64_F0; 2261 const int32_t unwPPCV0Index = UNW_PPC64_V0; 2262 #else 2263 // Instruction to reload TOC register "l r2,20(r1)" 2264 const uint32_t loadTOCRegInst = 0x80410014; 2265 const int32_t unwPPCF0Index = UNW_PPC_F0; 2266 const int32_t unwPPCV0Index = UNW_PPC_V0; 2267 #endif 2268 2269 R newRegisters = registers; 2270 2271 // lastStack points to the stack frame of the next routine up. 2272 pint_t lastStack = *(reinterpret_cast<pint_t *>(registers.getSP())); 2273 2274 // Return address is the address after call site instruction. 2275 pint_t returnAddress; 2276 2277 if (isSignalFrame) { 2278 _LIBUNWIND_TRACE_UNWINDING("Possible signal handler frame: lastStack=%p", 2279 reinterpret_cast<void *>(lastStack)); 2280 2281 sigcontext *sigContext = reinterpret_cast<sigcontext *>( 2282 reinterpret_cast<char *>(lastStack) + STKMIN); 2283 returnAddress = sigContext->sc_jmpbuf.jmp_context.iar; 2284 2285 _LIBUNWIND_TRACE_UNWINDING("From sigContext=%p, returnAddress=%p\n", 2286 reinterpret_cast<void *>(sigContext), 2287 reinterpret_cast<void *>(returnAddress)); 2288 2289 if (returnAddress < 0x10000000) { 2290 // Try again using STKMINALIGN 2291 sigContext = reinterpret_cast<sigcontext *>( 2292 reinterpret_cast<char *>(lastStack) + STKMINALIGN); 2293 returnAddress = sigContext->sc_jmpbuf.jmp_context.iar; 2294 if (returnAddress < 0x10000000) { 2295 _LIBUNWIND_TRACE_UNWINDING("Bad returnAddress=%p\n", 2296 reinterpret_cast<void *>(returnAddress)); 2297 return UNW_EBADFRAME; 2298 } else { 2299 _LIBUNWIND_TRACE_UNWINDING("Tried again using STKMINALIGN: " 2300 "sigContext=%p, returnAddress=%p. " 2301 "Seems to be a valid address\n", 2302 reinterpret_cast<void *>(sigContext), 2303 reinterpret_cast<void *>(returnAddress)); 2304 } 2305 } 2306 // Restore the condition register from sigcontext. 2307 newRegisters.setCR(sigContext->sc_jmpbuf.jmp_context.cr); 2308 2309 // Restore GPRs from sigcontext. 2310 for (int i = 0; i < 32; ++i) 2311 newRegisters.setRegister(i, sigContext->sc_jmpbuf.jmp_context.gpr[i]); 2312 2313 // Restore FPRs from sigcontext. 2314 for (int i = 0; i < 32; ++i) 2315 newRegisters.setFloatRegister(i + unwPPCF0Index, 2316 sigContext->sc_jmpbuf.jmp_context.fpr[i]); 2317 2318 // Restore vector registers if there is an associated extended context 2319 // structure. 2320 if (sigContext->sc_jmpbuf.jmp_context.msr & __EXTCTX) { 2321 ucontext_t *uContext = reinterpret_cast<ucontext_t *>(sigContext); 2322 if (uContext->__extctx->__extctx_magic == __EXTCTX_MAGIC) { 2323 for (int i = 0; i < 32; ++i) 2324 newRegisters.setVectorRegister( 2325 i + unwPPCV0Index, *(reinterpret_cast<v128 *>( 2326 &(uContext->__extctx->__vmx.__vr[i])))); 2327 } 2328 } 2329 } else { 2330 // Step up a normal frame. 2331 returnAddress = reinterpret_cast<pint_t *>(lastStack)[2]; 2332 2333 _LIBUNWIND_TRACE_UNWINDING("Extract info from lastStack=%p, " 2334 "returnAddress=%p\n", 2335 reinterpret_cast<void *>(lastStack), 2336 reinterpret_cast<void *>(returnAddress)); 2337 _LIBUNWIND_TRACE_UNWINDING("fpr_regs=%d, gpr_regs=%d, saves_cr=%d\n", 2338 TBTable->tb.fpr_saved, TBTable->tb.gpr_saved, 2339 TBTable->tb.saves_cr); 2340 2341 // Restore FP registers. 2342 char *ptrToRegs = reinterpret_cast<char *>(lastStack); 2343 double *FPRegs = reinterpret_cast<double *>( 2344 ptrToRegs - (TBTable->tb.fpr_saved * sizeof(double))); 2345 for (int i = 0; i < TBTable->tb.fpr_saved; ++i) 2346 newRegisters.setFloatRegister( 2347 32 - TBTable->tb.fpr_saved + i + unwPPCF0Index, FPRegs[i]); 2348 2349 // Restore GP registers. 2350 ptrToRegs = reinterpret_cast<char *>(FPRegs); 2351 uintptr_t *GPRegs = reinterpret_cast<uintptr_t *>( 2352 ptrToRegs - (TBTable->tb.gpr_saved * sizeof(uintptr_t))); 2353 for (int i = 0; i < TBTable->tb.gpr_saved; ++i) 2354 newRegisters.setRegister(32 - TBTable->tb.gpr_saved + i, GPRegs[i]); 2355 2356 // Restore Vector registers. 2357 ptrToRegs = reinterpret_cast<char *>(GPRegs); 2358 2359 // Restore vector registers only if this is a Clang frame. Also 2360 // check if traceback table bit has_vec is set. If it is, structure 2361 // vec_ext is available. 2362 if (_info.flags == frameType::frameWithEHInfo && TBTable->tb.has_vec) { 2363 2364 // Get to the vec_ext structure to check if vector registers are saved. 2365 uint32_t *p = reinterpret_cast<uint32_t *>(&TBTable->tb_ext); 2366 2367 // Skip field parminfo if exists. 2368 if (TBTable->tb.fixedparms || TBTable->tb.floatparms) 2369 ++p; 2370 2371 // Skip field tb_offset if exists. 2372 if (TBTable->tb.has_tboff) 2373 ++p; 2374 2375 // Skip field hand_mask if exists. 2376 if (TBTable->tb.int_hndl) 2377 ++p; 2378 2379 // Skip fields ctl_info and ctl_info_disp if exist. 2380 if (TBTable->tb.has_ctl) { 2381 // Skip field ctl_info. 2382 ++p; 2383 // Skip field ctl_info_disp. 2384 ++p; 2385 } 2386 2387 // Skip fields name_len and name if exist. 2388 // p is supposed to point to field name_len now. 2389 uint8_t *charPtr = reinterpret_cast<uint8_t *>(p); 2390 if (TBTable->tb.name_present) { 2391 const uint16_t name_len = *(reinterpret_cast<uint16_t *>(charPtr)); 2392 charPtr = charPtr + name_len + sizeof(uint16_t); 2393 } 2394 2395 // Skip field alloc_reg if it exists. 2396 if (TBTable->tb.uses_alloca) 2397 ++charPtr; 2398 2399 struct vec_ext *vec_ext = reinterpret_cast<struct vec_ext *>(charPtr); 2400 2401 _LIBUNWIND_TRACE_UNWINDING("vr_saved=%d\n", vec_ext->vr_saved); 2402 2403 // Restore vector register(s) if saved on the stack. 2404 if (vec_ext->vr_saved) { 2405 // Saved vector registers are 16-byte aligned. 2406 if (reinterpret_cast<uintptr_t>(ptrToRegs) % 16) 2407 ptrToRegs -= reinterpret_cast<uintptr_t>(ptrToRegs) % 16; 2408 v128 *VecRegs = reinterpret_cast<v128 *>(ptrToRegs - vec_ext->vr_saved * 2409 sizeof(v128)); 2410 for (int i = 0; i < vec_ext->vr_saved; ++i) { 2411 newRegisters.setVectorRegister( 2412 32 - vec_ext->vr_saved + i + unwPPCV0Index, VecRegs[i]); 2413 } 2414 } 2415 } 2416 if (TBTable->tb.saves_cr) { 2417 // Get the saved condition register. The condition register is only 2418 // a single word. 2419 newRegisters.setCR( 2420 *(reinterpret_cast<uint32_t *>(lastStack + sizeof(uintptr_t)))); 2421 } 2422 2423 // Restore the SP. 2424 newRegisters.setSP(lastStack); 2425 2426 // The first instruction after return. 2427 uint32_t firstInstruction = *(reinterpret_cast<uint32_t *>(returnAddress)); 2428 2429 // Do we need to set the TOC register? 2430 _LIBUNWIND_TRACE_UNWINDING( 2431 "Current gpr2=%p\n", 2432 reinterpret_cast<void *>(newRegisters.getRegister(2))); 2433 if (firstInstruction == loadTOCRegInst) { 2434 _LIBUNWIND_TRACE_UNWINDING( 2435 "Set gpr2=%p from frame\n", 2436 reinterpret_cast<void *>(reinterpret_cast<pint_t *>(lastStack)[5])); 2437 newRegisters.setRegister(2, reinterpret_cast<pint_t *>(lastStack)[5]); 2438 } 2439 } 2440 _LIBUNWIND_TRACE_UNWINDING("lastStack=%p, returnAddress=%p, pc=%p\n", 2441 reinterpret_cast<void *>(lastStack), 2442 reinterpret_cast<void *>(returnAddress), 2443 reinterpret_cast<void *>(pc)); 2444 2445 // The return address is the address after call site instruction, so 2446 // setting IP to that simualates a return. 2447 newRegisters.setIP(reinterpret_cast<uintptr_t>(returnAddress)); 2448 2449 // Simulate the step by replacing the register set with the new ones. 2450 registers = newRegisters; 2451 2452 // Check if the next frame is a signal frame. 2453 pint_t nextStack = *(reinterpret_cast<pint_t *>(registers.getSP())); 2454 2455 // Return address is the address after call site instruction. 2456 pint_t nextReturnAddress = reinterpret_cast<pint_t *>(nextStack)[2]; 2457 2458 if (nextReturnAddress > 0x01 && nextReturnAddress < 0x10000) { 2459 _LIBUNWIND_TRACE_UNWINDING("The next is a signal handler frame: " 2460 "nextStack=%p, next return address=%p\n", 2461 reinterpret_cast<void *>(nextStack), 2462 reinterpret_cast<void *>(nextReturnAddress)); 2463 isSignalFrame = true; 2464 } else { 2465 isSignalFrame = false; 2466 } 2467 2468 return UNW_STEP_SUCCESS; 2469 } 2470 #endif // defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 2471 2472 template <typename A, typename R> 2473 void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) { 2474 #if defined(_LIBUNWIND_TARGET_LINUX) && (defined(_LIBUNWIND_TARGET_AARCH64) || defined(_LIBUNWIND_TARGET_S390X)) 2475 _isSigReturn = false; 2476 #endif 2477 2478 pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP)); 2479 #if defined(_LIBUNWIND_ARM_EHABI) 2480 // Remove the thumb bit so the IP represents the actual instruction address. 2481 // This matches the behaviour of _Unwind_GetIP on arm. 2482 pc &= (pint_t)~0x1; 2483 #endif 2484 2485 // Exit early if at the top of the stack. 2486 if (pc == 0) { 2487 _unwindInfoMissing = true; 2488 return; 2489 } 2490 2491 // If the last line of a function is a "throw" the compiler sometimes 2492 // emits no instructions after the call to __cxa_throw. This means 2493 // the return address is actually the start of the next function. 2494 // To disambiguate this, back up the pc when we know it is a return 2495 // address. 2496 if (isReturnAddress) 2497 #if defined(_AIX) 2498 // PC needs to be a 4-byte aligned address to be able to look for a 2499 // word of 0 that indicates the start of the traceback table at the end 2500 // of a function on AIX. 2501 pc -= 4; 2502 #else 2503 --pc; 2504 #endif 2505 2506 // Ask address space object to find unwind sections for this pc. 2507 UnwindInfoSections sects; 2508 if (_addressSpace.findUnwindSections(pc, sects)) { 2509 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 2510 // If there is a compact unwind encoding table, look there first. 2511 if (sects.compact_unwind_section != 0) { 2512 if (this->getInfoFromCompactEncodingSection(pc, sects)) { 2513 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 2514 // Found info in table, done unless encoding says to use dwarf. 2515 uint32_t dwarfOffset; 2516 if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) { 2517 if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) { 2518 // found info in dwarf, done 2519 return; 2520 } 2521 } 2522 #endif 2523 // If unwind table has entry, but entry says there is no unwind info, 2524 // record that we have no unwind info. 2525 if (_info.format == 0) 2526 _unwindInfoMissing = true; 2527 return; 2528 } 2529 } 2530 #endif // defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 2531 2532 #if defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 2533 // If there is SEH unwind info, look there next. 2534 if (this->getInfoFromSEH(pc)) 2535 return; 2536 #endif 2537 2538 #if defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 2539 // If there is unwind info in the traceback table, look there next. 2540 if (this->getInfoFromTBTable(pc, _registers)) 2541 return; 2542 #endif 2543 2544 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 2545 // If there is dwarf unwind info, look there next. 2546 if (sects.dwarf_section != 0) { 2547 if (this->getInfoFromDwarfSection(pc, sects)) { 2548 // found info in dwarf, done 2549 return; 2550 } 2551 } 2552 #endif 2553 2554 #if defined(_LIBUNWIND_ARM_EHABI) 2555 // If there is ARM EHABI unwind info, look there next. 2556 if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects)) 2557 return; 2558 #endif 2559 } 2560 2561 #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 2562 // There is no static unwind info for this pc. Look to see if an FDE was 2563 // dynamically registered for it. 2564 pint_t cachedFDE = DwarfFDECache<A>::findFDE(DwarfFDECache<A>::kSearchAll, 2565 pc); 2566 if (cachedFDE != 0) { 2567 typename CFI_Parser<A>::FDE_Info fdeInfo; 2568 typename CFI_Parser<A>::CIE_Info cieInfo; 2569 if (!CFI_Parser<A>::decodeFDE(_addressSpace, cachedFDE, &fdeInfo, &cieInfo)) 2570 if (getInfoFromFdeCie(fdeInfo, cieInfo, pc, 0)) 2571 return; 2572 } 2573 2574 // Lastly, ask AddressSpace object about platform specific ways to locate 2575 // other FDEs. 2576 pint_t fde; 2577 if (_addressSpace.findOtherFDE(pc, fde)) { 2578 typename CFI_Parser<A>::FDE_Info fdeInfo; 2579 typename CFI_Parser<A>::CIE_Info cieInfo; 2580 if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) { 2581 // Double check this FDE is for a function that includes the pc. 2582 if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) 2583 if (getInfoFromFdeCie(fdeInfo, cieInfo, pc, 0)) 2584 return; 2585 } 2586 } 2587 #endif // #if defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 2588 2589 #if defined(_LIBUNWIND_TARGET_LINUX) && (defined(_LIBUNWIND_TARGET_AARCH64) || defined(_LIBUNWIND_TARGET_S390X)) 2590 if (setInfoForSigReturn()) 2591 return; 2592 #endif 2593 2594 // no unwind info, flag that we can't reliably unwind 2595 _unwindInfoMissing = true; 2596 } 2597 2598 #if defined(_LIBUNWIND_TARGET_LINUX) && defined(_LIBUNWIND_TARGET_AARCH64) 2599 template <typename A, typename R> 2600 bool UnwindCursor<A, R>::setInfoForSigReturn(Registers_arm64 &) { 2601 // Look for the sigreturn trampoline. The trampoline's body is two 2602 // specific instructions (see below). Typically the trampoline comes from the 2603 // vDSO[1] (i.e. the __kernel_rt_sigreturn function). A libc might provide its 2604 // own restorer function, though, or user-mode QEMU might write a trampoline 2605 // onto the stack. 2606 // 2607 // This special code path is a fallback that is only used if the trampoline 2608 // lacks proper (e.g. DWARF) unwind info. On AArch64, a new DWARF register 2609 // constant for the PC needs to be defined before DWARF can handle a signal 2610 // trampoline. This code may segfault if the target PC is unreadable, e.g.: 2611 // - The PC points at a function compiled without unwind info, and which is 2612 // part of an execute-only mapping (e.g. using -Wl,--execute-only). 2613 // - The PC is invalid and happens to point to unreadable or unmapped memory. 2614 // 2615 // [1] https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/vdso/sigreturn.S 2616 const pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP)); 2617 // Look for instructions: mov x8, #0x8b; svc #0x0 2618 if (_addressSpace.get32(pc) == 0xd2801168 && 2619 _addressSpace.get32(pc + 4) == 0xd4000001) { 2620 _info = {}; 2621 _info.start_ip = pc; 2622 _info.end_ip = pc + 4; 2623 _isSigReturn = true; 2624 return true; 2625 } 2626 return false; 2627 } 2628 2629 template <typename A, typename R> 2630 int UnwindCursor<A, R>::stepThroughSigReturn(Registers_arm64 &) { 2631 // In the signal trampoline frame, sp points to an rt_sigframe[1], which is: 2632 // - 128-byte siginfo struct 2633 // - ucontext struct: 2634 // - 8-byte long (uc_flags) 2635 // - 8-byte pointer (uc_link) 2636 // - 24-byte stack_t 2637 // - 128-byte signal set 2638 // - 8 bytes of padding because sigcontext has 16-byte alignment 2639 // - sigcontext/mcontext_t 2640 // [1] https://github.com/torvalds/linux/blob/master/arch/arm64/kernel/signal.c 2641 const pint_t kOffsetSpToSigcontext = (128 + 8 + 8 + 24 + 128 + 8); // 304 2642 2643 // Offsets from sigcontext to each register. 2644 const pint_t kOffsetGprs = 8; // offset to "__u64 regs[31]" field 2645 const pint_t kOffsetSp = 256; // offset to "__u64 sp" field 2646 const pint_t kOffsetPc = 264; // offset to "__u64 pc" field 2647 2648 pint_t sigctx = _registers.getSP() + kOffsetSpToSigcontext; 2649 2650 for (int i = 0; i <= 30; ++i) { 2651 uint64_t value = _addressSpace.get64(sigctx + kOffsetGprs + 2652 static_cast<pint_t>(i * 8)); 2653 _registers.setRegister(UNW_AARCH64_X0 + i, value); 2654 } 2655 _registers.setSP(_addressSpace.get64(sigctx + kOffsetSp)); 2656 _registers.setIP(_addressSpace.get64(sigctx + kOffsetPc)); 2657 _isSignalFrame = true; 2658 return UNW_STEP_SUCCESS; 2659 } 2660 #endif // defined(_LIBUNWIND_TARGET_LINUX) && defined(_LIBUNWIND_TARGET_AARCH64) 2661 2662 #if defined(_LIBUNWIND_TARGET_LINUX) && defined(_LIBUNWIND_TARGET_S390X) 2663 template <typename A, typename R> 2664 bool UnwindCursor<A, R>::setInfoForSigReturn(Registers_s390x &) { 2665 // Look for the sigreturn trampoline. The trampoline's body is a 2666 // specific instruction (see below). Typically the trampoline comes from the 2667 // vDSO (i.e. the __kernel_[rt_]sigreturn function). A libc might provide its 2668 // own restorer function, though, or user-mode QEMU might write a trampoline 2669 // onto the stack. 2670 const pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP)); 2671 const uint16_t inst = _addressSpace.get16(pc); 2672 if (inst == 0x0a77 || inst == 0x0aad) { 2673 _info = {}; 2674 _info.start_ip = pc; 2675 _info.end_ip = pc + 2; 2676 _isSigReturn = true; 2677 return true; 2678 } 2679 return false; 2680 } 2681 2682 template <typename A, typename R> 2683 int UnwindCursor<A, R>::stepThroughSigReturn(Registers_s390x &) { 2684 // Determine current SP. 2685 const pint_t sp = static_cast<pint_t>(this->getReg(UNW_REG_SP)); 2686 // According to the s390x ABI, the CFA is at (incoming) SP + 160. 2687 const pint_t cfa = sp + 160; 2688 2689 // Determine current PC and instruction there (this must be either 2690 // a "svc __NR_sigreturn" or "svc __NR_rt_sigreturn"). 2691 const pint_t pc = static_cast<pint_t>(this->getReg(UNW_REG_IP)); 2692 const uint16_t inst = _addressSpace.get16(pc); 2693 2694 // Find the addresses of the signo and sigcontext in the frame. 2695 pint_t pSigctx = 0; 2696 pint_t pSigno = 0; 2697 2698 // "svc __NR_sigreturn" uses a non-RT signal trampoline frame. 2699 if (inst == 0x0a77) { 2700 // Layout of a non-RT signal trampoline frame, starting at the CFA: 2701 // - 8-byte signal mask 2702 // - 8-byte pointer to sigcontext, followed by signo 2703 // - 4-byte signo 2704 pSigctx = _addressSpace.get64(cfa + 8); 2705 pSigno = pSigctx + 344; 2706 } 2707 2708 // "svc __NR_rt_sigreturn" uses a RT signal trampoline frame. 2709 if (inst == 0x0aad) { 2710 // Layout of a RT signal trampoline frame, starting at the CFA: 2711 // - 8-byte retcode (+ alignment) 2712 // - 128-byte siginfo struct (starts with signo) 2713 // - ucontext struct: 2714 // - 8-byte long (uc_flags) 2715 // - 8-byte pointer (uc_link) 2716 // - 24-byte stack_t 2717 // - 8 bytes of padding because sigcontext has 16-byte alignment 2718 // - sigcontext/mcontext_t 2719 pSigctx = cfa + 8 + 128 + 8 + 8 + 24 + 8; 2720 pSigno = cfa + 8; 2721 } 2722 2723 assert(pSigctx != 0); 2724 assert(pSigno != 0); 2725 2726 // Offsets from sigcontext to each register. 2727 const pint_t kOffsetPc = 8; 2728 const pint_t kOffsetGprs = 16; 2729 const pint_t kOffsetFprs = 216; 2730 2731 // Restore all registers. 2732 for (int i = 0; i < 16; ++i) { 2733 uint64_t value = _addressSpace.get64(pSigctx + kOffsetGprs + 2734 static_cast<pint_t>(i * 8)); 2735 _registers.setRegister(UNW_S390X_R0 + i, value); 2736 } 2737 for (int i = 0; i < 16; ++i) { 2738 static const int fpr[16] = { 2739 UNW_S390X_F0, UNW_S390X_F1, UNW_S390X_F2, UNW_S390X_F3, 2740 UNW_S390X_F4, UNW_S390X_F5, UNW_S390X_F6, UNW_S390X_F7, 2741 UNW_S390X_F8, UNW_S390X_F9, UNW_S390X_F10, UNW_S390X_F11, 2742 UNW_S390X_F12, UNW_S390X_F13, UNW_S390X_F14, UNW_S390X_F15 2743 }; 2744 double value = _addressSpace.getDouble(pSigctx + kOffsetFprs + 2745 static_cast<pint_t>(i * 8)); 2746 _registers.setFloatRegister(fpr[i], value); 2747 } 2748 _registers.setIP(_addressSpace.get64(pSigctx + kOffsetPc)); 2749 2750 // SIGILL, SIGFPE and SIGTRAP are delivered with psw_addr 2751 // after the faulting instruction rather than before it. 2752 // Do not set _isSignalFrame in that case. 2753 uint32_t signo = _addressSpace.get32(pSigno); 2754 _isSignalFrame = (signo != 4 && signo != 5 && signo != 8); 2755 2756 return UNW_STEP_SUCCESS; 2757 } 2758 #endif // defined(_LIBUNWIND_TARGET_LINUX) && defined(_LIBUNWIND_TARGET_S390X) 2759 2760 template <typename A, typename R> 2761 int UnwindCursor<A, R>::step() { 2762 // Bottom of stack is defined is when unwind info cannot be found. 2763 if (_unwindInfoMissing) 2764 return UNW_STEP_END; 2765 2766 // Use unwinding info to modify register set as if function returned. 2767 int result; 2768 #if defined(_LIBUNWIND_TARGET_LINUX) && (defined(_LIBUNWIND_TARGET_AARCH64) || defined(_LIBUNWIND_TARGET_S390X)) 2769 if (_isSigReturn) { 2770 result = this->stepThroughSigReturn(); 2771 } else 2772 #endif 2773 { 2774 #if defined(_LIBUNWIND_SUPPORT_COMPACT_UNWIND) 2775 result = this->stepWithCompactEncoding(); 2776 #elif defined(_LIBUNWIND_SUPPORT_SEH_UNWIND) 2777 result = this->stepWithSEHData(); 2778 #elif defined(_LIBUNWIND_SUPPORT_TBTAB_UNWIND) 2779 result = this->stepWithTBTableData(); 2780 #elif defined(_LIBUNWIND_SUPPORT_DWARF_UNWIND) 2781 result = this->stepWithDwarfFDE(); 2782 #elif defined(_LIBUNWIND_ARM_EHABI) 2783 result = this->stepWithEHABI(); 2784 #else 2785 #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \ 2786 _LIBUNWIND_SUPPORT_SEH_UNWIND or \ 2787 _LIBUNWIND_SUPPORT_DWARF_UNWIND or \ 2788 _LIBUNWIND_ARM_EHABI 2789 #endif 2790 } 2791 2792 // update info based on new PC 2793 if (result == UNW_STEP_SUCCESS) { 2794 this->setInfoBasedOnIPRegister(true); 2795 if (_unwindInfoMissing) 2796 return UNW_STEP_END; 2797 } 2798 2799 return result; 2800 } 2801 2802 template <typename A, typename R> 2803 void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) { 2804 if (_unwindInfoMissing) 2805 memset(info, 0, sizeof(*info)); 2806 else 2807 *info = _info; 2808 } 2809 2810 template <typename A, typename R> 2811 bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen, 2812 unw_word_t *offset) { 2813 return _addressSpace.findFunctionName((pint_t)this->getReg(UNW_REG_IP), 2814 buf, bufLen, offset); 2815 } 2816 2817 #if defined(_LIBUNWIND_USE_CET) 2818 extern "C" void *__libunwind_cet_get_registers(unw_cursor_t *cursor) { 2819 AbstractUnwindCursor *co = (AbstractUnwindCursor *)cursor; 2820 return co->get_registers(); 2821 } 2822 #endif 2823 } // namespace libunwind 2824 2825 #endif // __UNWINDCURSOR_HPP__ 2826