Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1 | //===------------------------- UnwindCursor.hpp ---------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | // |
Ed Maste | 17473fd | 2016-08-30 13:08:21 +0000 | [diff] [blame] | 9 | // C++ interface to lower levels of libunwind |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 10 | //===----------------------------------------------------------------------===// |
| 11 | |
| 12 | #ifndef __UNWINDCURSOR_HPP__ |
| 13 | #define __UNWINDCURSOR_HPP__ |
| 14 | |
| 15 | #include <algorithm> |
| 16 | #include <stdint.h> |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
Asiri Rathnayake | 9feea20 | 2016-09-28 10:57:15 +0000 | [diff] [blame] | 19 | #ifndef _LIBUNWIND_HAS_NO_THREADS |
| 20 | #include <pthread.h> |
| 21 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 22 | #include <unwind.h> |
| 23 | |
| 24 | #ifdef __APPLE__ |
| 25 | #include <mach-o/dyld.h> |
| 26 | #endif |
| 27 | |
| 28 | #include "config.h" |
| 29 | |
| 30 | #include "AddressSpace.hpp" |
| 31 | #include "CompactUnwinder.hpp" |
| 32 | #include "config.h" |
| 33 | #include "DwarfInstructions.hpp" |
| 34 | #include "EHHeaderParser.hpp" |
| 35 | #include "libunwind.h" |
| 36 | #include "Registers.hpp" |
| 37 | #include "Unwind-EHABI.h" |
| 38 | |
| 39 | namespace libunwind { |
| 40 | |
| 41 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 42 | /// Cache of recently found FDEs. |
| 43 | template <typename A> |
| 44 | class _LIBUNWIND_HIDDEN DwarfFDECache { |
| 45 | typedef typename A::pint_t pint_t; |
| 46 | public: |
| 47 | static pint_t findFDE(pint_t mh, pint_t pc); |
| 48 | static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde); |
| 49 | static void removeAllIn(pint_t mh); |
| 50 | static void iterateCacheEntries(void (*func)(unw_word_t ip_start, |
| 51 | unw_word_t ip_end, |
| 52 | unw_word_t fde, unw_word_t mh)); |
| 53 | |
| 54 | private: |
| 55 | |
| 56 | struct entry { |
| 57 | pint_t mh; |
| 58 | pint_t ip_start; |
| 59 | pint_t ip_end; |
| 60 | pint_t fde; |
| 61 | }; |
| 62 | |
| 63 | // These fields are all static to avoid needing an initializer. |
| 64 | // There is only one instance of this class per process. |
Asiri Rathnayake | 9feea20 | 2016-09-28 10:57:15 +0000 | [diff] [blame] | 65 | #ifndef _LIBUNWIND_HAS_NO_THREADS |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 66 | static pthread_rwlock_t _lock; |
Asiri Rathnayake | 9feea20 | 2016-09-28 10:57:15 +0000 | [diff] [blame] | 67 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 68 | #ifdef __APPLE__ |
| 69 | static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide); |
| 70 | static bool _registeredForDyldUnloads; |
| 71 | #endif |
| 72 | // Can't use std::vector<> here because this code is below libc++. |
| 73 | static entry *_buffer; |
| 74 | static entry *_bufferUsed; |
| 75 | static entry *_bufferEnd; |
| 76 | static entry _initialBuffer[64]; |
| 77 | }; |
| 78 | |
| 79 | template <typename A> |
| 80 | typename DwarfFDECache<A>::entry * |
| 81 | DwarfFDECache<A>::_buffer = _initialBuffer; |
| 82 | |
| 83 | template <typename A> |
| 84 | typename DwarfFDECache<A>::entry * |
| 85 | DwarfFDECache<A>::_bufferUsed = _initialBuffer; |
| 86 | |
| 87 | template <typename A> |
| 88 | typename DwarfFDECache<A>::entry * |
| 89 | DwarfFDECache<A>::_bufferEnd = &_initialBuffer[64]; |
| 90 | |
| 91 | template <typename A> |
| 92 | typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64]; |
| 93 | |
Asiri Rathnayake | 9feea20 | 2016-09-28 10:57:15 +0000 | [diff] [blame] | 94 | #ifndef _LIBUNWIND_HAS_NO_THREADS |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 95 | template <typename A> |
| 96 | pthread_rwlock_t DwarfFDECache<A>::_lock = PTHREAD_RWLOCK_INITIALIZER; |
Asiri Rathnayake | 9feea20 | 2016-09-28 10:57:15 +0000 | [diff] [blame] | 97 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 98 | |
| 99 | #ifdef __APPLE__ |
| 100 | template <typename A> |
| 101 | bool DwarfFDECache<A>::_registeredForDyldUnloads = false; |
| 102 | #endif |
| 103 | |
| 104 | template <typename A> |
| 105 | typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, pint_t pc) { |
| 106 | pint_t result = 0; |
| 107 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_rdlock(&_lock)); |
| 108 | for (entry *p = _buffer; p < _bufferUsed; ++p) { |
| 109 | if ((mh == p->mh) || (mh == 0)) { |
| 110 | if ((p->ip_start <= pc) && (pc < p->ip_end)) { |
| 111 | result = p->fde; |
| 112 | break; |
| 113 | } |
| 114 | } |
| 115 | } |
| 116 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock)); |
| 117 | return result; |
| 118 | } |
| 119 | |
| 120 | template <typename A> |
| 121 | void DwarfFDECache<A>::add(pint_t mh, pint_t ip_start, pint_t ip_end, |
| 122 | pint_t fde) { |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 123 | #if !defined(_LIBUNWIND_NO_HEAP) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 124 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock)); |
| 125 | if (_bufferUsed >= _bufferEnd) { |
| 126 | size_t oldSize = (size_t)(_bufferEnd - _buffer); |
| 127 | size_t newSize = oldSize * 4; |
| 128 | // Can't use operator new (we are below it). |
| 129 | entry *newBuffer = (entry *)malloc(newSize * sizeof(entry)); |
| 130 | memcpy(newBuffer, _buffer, oldSize * sizeof(entry)); |
| 131 | if (_buffer != _initialBuffer) |
| 132 | free(_buffer); |
| 133 | _buffer = newBuffer; |
| 134 | _bufferUsed = &newBuffer[oldSize]; |
| 135 | _bufferEnd = &newBuffer[newSize]; |
| 136 | } |
| 137 | _bufferUsed->mh = mh; |
| 138 | _bufferUsed->ip_start = ip_start; |
| 139 | _bufferUsed->ip_end = ip_end; |
| 140 | _bufferUsed->fde = fde; |
| 141 | ++_bufferUsed; |
| 142 | #ifdef __APPLE__ |
| 143 | if (!_registeredForDyldUnloads) { |
| 144 | _dyld_register_func_for_remove_image(&dyldUnloadHook); |
| 145 | _registeredForDyldUnloads = true; |
| 146 | } |
| 147 | #endif |
| 148 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock)); |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 149 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 150 | } |
| 151 | |
| 152 | template <typename A> |
| 153 | void DwarfFDECache<A>::removeAllIn(pint_t mh) { |
| 154 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock)); |
| 155 | entry *d = _buffer; |
| 156 | for (const entry *s = _buffer; s < _bufferUsed; ++s) { |
| 157 | if (s->mh != mh) { |
| 158 | if (d != s) |
| 159 | *d = *s; |
| 160 | ++d; |
| 161 | } |
| 162 | } |
| 163 | _bufferUsed = d; |
| 164 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock)); |
| 165 | } |
| 166 | |
| 167 | #ifdef __APPLE__ |
| 168 | template <typename A> |
| 169 | void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) { |
| 170 | removeAllIn((pint_t) mh); |
| 171 | } |
| 172 | #endif |
| 173 | |
| 174 | template <typename A> |
| 175 | void DwarfFDECache<A>::iterateCacheEntries(void (*func)( |
| 176 | unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) { |
| 177 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock)); |
| 178 | for (entry *p = _buffer; p < _bufferUsed; ++p) { |
| 179 | (*func)(p->ip_start, p->ip_end, p->fde, p->mh); |
| 180 | } |
| 181 | _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock)); |
| 182 | } |
| 183 | #endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 184 | |
| 185 | |
| 186 | #define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field)) |
| 187 | |
| 188 | #if _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 189 | template <typename A> class UnwindSectionHeader { |
| 190 | public: |
| 191 | UnwindSectionHeader(A &addressSpace, typename A::pint_t addr) |
| 192 | : _addressSpace(addressSpace), _addr(addr) {} |
| 193 | |
| 194 | uint32_t version() const { |
| 195 | return _addressSpace.get32(_addr + |
| 196 | offsetof(unwind_info_section_header, version)); |
| 197 | } |
| 198 | uint32_t commonEncodingsArraySectionOffset() const { |
| 199 | return _addressSpace.get32(_addr + |
| 200 | offsetof(unwind_info_section_header, |
| 201 | commonEncodingsArraySectionOffset)); |
| 202 | } |
| 203 | uint32_t commonEncodingsArrayCount() const { |
| 204 | return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, |
| 205 | commonEncodingsArrayCount)); |
| 206 | } |
| 207 | uint32_t personalityArraySectionOffset() const { |
| 208 | return _addressSpace.get32(_addr + offsetof(unwind_info_section_header, |
| 209 | personalityArraySectionOffset)); |
| 210 | } |
| 211 | uint32_t personalityArrayCount() const { |
| 212 | return _addressSpace.get32( |
| 213 | _addr + offsetof(unwind_info_section_header, personalityArrayCount)); |
| 214 | } |
| 215 | uint32_t indexSectionOffset() const { |
| 216 | return _addressSpace.get32( |
| 217 | _addr + offsetof(unwind_info_section_header, indexSectionOffset)); |
| 218 | } |
| 219 | uint32_t indexCount() const { |
| 220 | return _addressSpace.get32( |
| 221 | _addr + offsetof(unwind_info_section_header, indexCount)); |
| 222 | } |
| 223 | |
| 224 | private: |
| 225 | A &_addressSpace; |
| 226 | typename A::pint_t _addr; |
| 227 | }; |
| 228 | |
| 229 | template <typename A> class UnwindSectionIndexArray { |
| 230 | public: |
| 231 | UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr) |
| 232 | : _addressSpace(addressSpace), _addr(addr) {} |
| 233 | |
| 234 | uint32_t functionOffset(uint32_t index) const { |
| 235 | return _addressSpace.get32( |
| 236 | _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, |
| 237 | functionOffset)); |
| 238 | } |
| 239 | uint32_t secondLevelPagesSectionOffset(uint32_t index) const { |
| 240 | return _addressSpace.get32( |
| 241 | _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, |
| 242 | secondLevelPagesSectionOffset)); |
| 243 | } |
| 244 | uint32_t lsdaIndexArraySectionOffset(uint32_t index) const { |
| 245 | return _addressSpace.get32( |
| 246 | _addr + arrayoffsetof(unwind_info_section_header_index_entry, index, |
| 247 | lsdaIndexArraySectionOffset)); |
| 248 | } |
| 249 | |
| 250 | private: |
| 251 | A &_addressSpace; |
| 252 | typename A::pint_t _addr; |
| 253 | }; |
| 254 | |
| 255 | template <typename A> class UnwindSectionRegularPageHeader { |
| 256 | public: |
| 257 | UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr) |
| 258 | : _addressSpace(addressSpace), _addr(addr) {} |
| 259 | |
| 260 | uint32_t kind() const { |
| 261 | return _addressSpace.get32( |
| 262 | _addr + offsetof(unwind_info_regular_second_level_page_header, kind)); |
| 263 | } |
| 264 | uint16_t entryPageOffset() const { |
| 265 | return _addressSpace.get16( |
| 266 | _addr + offsetof(unwind_info_regular_second_level_page_header, |
| 267 | entryPageOffset)); |
| 268 | } |
| 269 | uint16_t entryCount() const { |
| 270 | return _addressSpace.get16( |
| 271 | _addr + |
| 272 | offsetof(unwind_info_regular_second_level_page_header, entryCount)); |
| 273 | } |
| 274 | |
| 275 | private: |
| 276 | A &_addressSpace; |
| 277 | typename A::pint_t _addr; |
| 278 | }; |
| 279 | |
| 280 | template <typename A> class UnwindSectionRegularArray { |
| 281 | public: |
| 282 | UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr) |
| 283 | : _addressSpace(addressSpace), _addr(addr) {} |
| 284 | |
| 285 | uint32_t functionOffset(uint32_t index) const { |
| 286 | return _addressSpace.get32( |
| 287 | _addr + arrayoffsetof(unwind_info_regular_second_level_entry, index, |
| 288 | functionOffset)); |
| 289 | } |
| 290 | uint32_t encoding(uint32_t index) const { |
| 291 | return _addressSpace.get32( |
| 292 | _addr + |
| 293 | arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding)); |
| 294 | } |
| 295 | |
| 296 | private: |
| 297 | A &_addressSpace; |
| 298 | typename A::pint_t _addr; |
| 299 | }; |
| 300 | |
| 301 | template <typename A> class UnwindSectionCompressedPageHeader { |
| 302 | public: |
| 303 | UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr) |
| 304 | : _addressSpace(addressSpace), _addr(addr) {} |
| 305 | |
| 306 | uint32_t kind() const { |
| 307 | return _addressSpace.get32( |
| 308 | _addr + |
| 309 | offsetof(unwind_info_compressed_second_level_page_header, kind)); |
| 310 | } |
| 311 | uint16_t entryPageOffset() const { |
| 312 | return _addressSpace.get16( |
| 313 | _addr + offsetof(unwind_info_compressed_second_level_page_header, |
| 314 | entryPageOffset)); |
| 315 | } |
| 316 | uint16_t entryCount() const { |
| 317 | return _addressSpace.get16( |
| 318 | _addr + |
| 319 | offsetof(unwind_info_compressed_second_level_page_header, entryCount)); |
| 320 | } |
| 321 | uint16_t encodingsPageOffset() const { |
| 322 | return _addressSpace.get16( |
| 323 | _addr + offsetof(unwind_info_compressed_second_level_page_header, |
| 324 | encodingsPageOffset)); |
| 325 | } |
| 326 | uint16_t encodingsCount() const { |
| 327 | return _addressSpace.get16( |
| 328 | _addr + offsetof(unwind_info_compressed_second_level_page_header, |
| 329 | encodingsCount)); |
| 330 | } |
| 331 | |
| 332 | private: |
| 333 | A &_addressSpace; |
| 334 | typename A::pint_t _addr; |
| 335 | }; |
| 336 | |
| 337 | template <typename A> class UnwindSectionCompressedArray { |
| 338 | public: |
| 339 | UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr) |
| 340 | : _addressSpace(addressSpace), _addr(addr) {} |
| 341 | |
| 342 | uint32_t functionOffset(uint32_t index) const { |
| 343 | return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET( |
| 344 | _addressSpace.get32(_addr + index * sizeof(uint32_t))); |
| 345 | } |
| 346 | uint16_t encodingIndex(uint32_t index) const { |
| 347 | return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX( |
| 348 | _addressSpace.get32(_addr + index * sizeof(uint32_t))); |
| 349 | } |
| 350 | |
| 351 | private: |
| 352 | A &_addressSpace; |
| 353 | typename A::pint_t _addr; |
| 354 | }; |
| 355 | |
| 356 | template <typename A> class UnwindSectionLsdaArray { |
| 357 | public: |
| 358 | UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr) |
| 359 | : _addressSpace(addressSpace), _addr(addr) {} |
| 360 | |
| 361 | uint32_t functionOffset(uint32_t index) const { |
| 362 | return _addressSpace.get32( |
| 363 | _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, |
| 364 | index, functionOffset)); |
| 365 | } |
| 366 | uint32_t lsdaOffset(uint32_t index) const { |
| 367 | return _addressSpace.get32( |
| 368 | _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry, |
| 369 | index, lsdaOffset)); |
| 370 | } |
| 371 | |
| 372 | private: |
| 373 | A &_addressSpace; |
| 374 | typename A::pint_t _addr; |
| 375 | }; |
| 376 | #endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 377 | |
| 378 | class _LIBUNWIND_HIDDEN AbstractUnwindCursor { |
| 379 | public: |
| 380 | // NOTE: provide a class specific placement deallocation function (S5.3.4 p20) |
| 381 | // This avoids an unnecessary dependency to libc++abi. |
| 382 | void operator delete(void *, size_t) {} |
| 383 | |
| 384 | virtual ~AbstractUnwindCursor() {} |
| 385 | virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); } |
| 386 | virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); } |
| 387 | virtual void setReg(int, unw_word_t) { |
| 388 | _LIBUNWIND_ABORT("setReg not implemented"); |
| 389 | } |
| 390 | virtual bool validFloatReg(int) { |
| 391 | _LIBUNWIND_ABORT("validFloatReg not implemented"); |
| 392 | } |
| 393 | virtual unw_fpreg_t getFloatReg(int) { |
| 394 | _LIBUNWIND_ABORT("getFloatReg not implemented"); |
| 395 | } |
| 396 | virtual void setFloatReg(int, unw_fpreg_t) { |
| 397 | _LIBUNWIND_ABORT("setFloatReg not implemented"); |
| 398 | } |
| 399 | virtual int step() { _LIBUNWIND_ABORT("step not implemented"); } |
| 400 | virtual void getInfo(unw_proc_info_t *) { |
| 401 | _LIBUNWIND_ABORT("getInfo not implemented"); |
| 402 | } |
| 403 | virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); } |
| 404 | virtual bool isSignalFrame() { |
| 405 | _LIBUNWIND_ABORT("isSignalFrame not implemented"); |
| 406 | } |
| 407 | virtual bool getFunctionName(char *, size_t, unw_word_t *) { |
| 408 | _LIBUNWIND_ABORT("getFunctionName not implemented"); |
| 409 | } |
| 410 | virtual void setInfoBasedOnIPRegister(bool = false) { |
| 411 | _LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented"); |
| 412 | } |
| 413 | virtual const char *getRegisterName(int) { |
| 414 | _LIBUNWIND_ABORT("getRegisterName not implemented"); |
| 415 | } |
| 416 | #ifdef __arm__ |
| 417 | virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); } |
| 418 | #endif |
| 419 | }; |
| 420 | |
| 421 | /// UnwindCursor contains all state (including all register values) during |
| 422 | /// an unwind. This is normally stack allocated inside a unw_cursor_t. |
| 423 | template <typename A, typename R> |
| 424 | class UnwindCursor : public AbstractUnwindCursor{ |
| 425 | typedef typename A::pint_t pint_t; |
| 426 | public: |
| 427 | UnwindCursor(unw_context_t *context, A &as); |
| 428 | UnwindCursor(A &as, void *threadArg); |
| 429 | virtual ~UnwindCursor() {} |
| 430 | virtual bool validReg(int); |
| 431 | virtual unw_word_t getReg(int); |
| 432 | virtual void setReg(int, unw_word_t); |
| 433 | virtual bool validFloatReg(int); |
| 434 | virtual unw_fpreg_t getFloatReg(int); |
| 435 | virtual void setFloatReg(int, unw_fpreg_t); |
| 436 | virtual int step(); |
| 437 | virtual void getInfo(unw_proc_info_t *); |
| 438 | virtual void jumpto(); |
| 439 | virtual bool isSignalFrame(); |
| 440 | virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off); |
| 441 | virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false); |
| 442 | virtual const char *getRegisterName(int num); |
| 443 | #ifdef __arm__ |
| 444 | virtual void saveVFPAsX(); |
| 445 | #endif |
| 446 | |
| 447 | private: |
| 448 | |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 449 | #if _LIBUNWIND_ARM_EHABI |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 450 | bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections §s); |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 451 | |
| 452 | int stepWithEHABI() { |
| 453 | size_t len = 0; |
| 454 | size_t off = 0; |
| 455 | // FIXME: Calling decode_eht_entry() here is violating the libunwind |
| 456 | // abstraction layer. |
| 457 | const uint32_t *ehtp = |
| 458 | decode_eht_entry(reinterpret_cast<const uint32_t *>(_info.unwind_info), |
| 459 | &off, &len); |
| 460 | if (_Unwind_VRS_Interpret((_Unwind_Context *)this, ehtp, off, len) != |
| 461 | _URC_CONTINUE_UNWIND) |
| 462 | return UNW_STEP_END; |
| 463 | return UNW_STEP_SUCCESS; |
| 464 | } |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 465 | #endif |
| 466 | |
| 467 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 468 | bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections §s, |
| 469 | uint32_t fdeSectionOffsetHint=0); |
| 470 | int stepWithDwarfFDE() { |
| 471 | return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace, |
| 472 | (pint_t)this->getReg(UNW_REG_IP), |
| 473 | (pint_t)_info.unwind_info, |
| 474 | _registers); |
| 475 | } |
| 476 | #endif |
| 477 | |
| 478 | #if _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 479 | bool getInfoFromCompactEncodingSection(pint_t pc, |
| 480 | const UnwindInfoSections §s); |
| 481 | int stepWithCompactEncoding() { |
| 482 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 483 | if ( compactSaysUseDwarf() ) |
| 484 | return stepWithDwarfFDE(); |
| 485 | #endif |
| 486 | R dummy; |
| 487 | return stepWithCompactEncoding(dummy); |
| 488 | } |
| 489 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 490 | #if defined(_LIBUNWIND_TARGET_X86_64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 491 | int stepWithCompactEncoding(Registers_x86_64 &) { |
| 492 | return CompactUnwinder_x86_64<A>::stepWithCompactEncoding( |
| 493 | _info.format, _info.start_ip, _addressSpace, _registers); |
| 494 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 495 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 496 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 497 | #if defined(_LIBUNWIND_TARGET_I386) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 498 | int stepWithCompactEncoding(Registers_x86 &) { |
| 499 | return CompactUnwinder_x86<A>::stepWithCompactEncoding( |
| 500 | _info.format, (uint32_t)_info.start_ip, _addressSpace, _registers); |
| 501 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 502 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 503 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 504 | #if defined(_LIBUNWIND_TARGET_PPC) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 505 | int stepWithCompactEncoding(Registers_ppc &) { |
| 506 | return UNW_EINVAL; |
| 507 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 508 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 509 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 510 | #if defined(_LIBUNWIND_TARGET_AARCH64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 511 | int stepWithCompactEncoding(Registers_arm64 &) { |
| 512 | return CompactUnwinder_arm64<A>::stepWithCompactEncoding( |
| 513 | _info.format, _info.start_ip, _addressSpace, _registers); |
| 514 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 515 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 516 | |
| 517 | bool compactSaysUseDwarf(uint32_t *offset=NULL) const { |
| 518 | R dummy; |
| 519 | return compactSaysUseDwarf(dummy, offset); |
| 520 | } |
| 521 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 522 | #if defined(_LIBUNWIND_TARGET_X86_64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 523 | bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const { |
| 524 | if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) { |
| 525 | if (offset) |
| 526 | *offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET); |
| 527 | return true; |
| 528 | } |
| 529 | return false; |
| 530 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 531 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 532 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 533 | #if defined(_LIBUNWIND_TARGET_I386) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 534 | bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const { |
| 535 | if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) { |
| 536 | if (offset) |
| 537 | *offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET); |
| 538 | return true; |
| 539 | } |
| 540 | return false; |
| 541 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 542 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 543 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 544 | #if defined(_LIBUNWIND_TARGET_PPC) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 545 | bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const { |
| 546 | return true; |
| 547 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 548 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 549 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 550 | #if defined(_LIBUNWIND_TARGET_AARCH64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 551 | bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const { |
| 552 | if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) { |
| 553 | if (offset) |
| 554 | *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET); |
| 555 | return true; |
| 556 | } |
| 557 | return false; |
| 558 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 559 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 560 | #endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 561 | |
| 562 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 563 | compact_unwind_encoding_t dwarfEncoding() const { |
| 564 | R dummy; |
| 565 | return dwarfEncoding(dummy); |
| 566 | } |
| 567 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 568 | #if defined(_LIBUNWIND_TARGET_X86_64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 569 | compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const { |
| 570 | return UNWIND_X86_64_MODE_DWARF; |
| 571 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 572 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 573 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 574 | #if defined(_LIBUNWIND_TARGET_I386) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 575 | compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const { |
| 576 | return UNWIND_X86_MODE_DWARF; |
| 577 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 578 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 579 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 580 | #if defined(_LIBUNWIND_TARGET_PPC) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 581 | compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const { |
| 582 | return 0; |
| 583 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 584 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 585 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 586 | #if defined(_LIBUNWIND_TARGET_AARCH64) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 587 | compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const { |
| 588 | return UNWIND_ARM64_MODE_DWARF; |
| 589 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 590 | #endif |
Peter Zotov | d4255ab | 2015-08-31 05:26:37 +0000 | [diff] [blame] | 591 | |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 592 | #if defined (_LIBUNWIND_TARGET_OR1K) |
Peter Zotov | d4255ab | 2015-08-31 05:26:37 +0000 | [diff] [blame] | 593 | compact_unwind_encoding_t dwarfEncoding(Registers_or1k &) const { |
| 594 | return 0; |
| 595 | } |
Asiri Rathnayake | d2d1ea9 | 2016-05-25 12:36:34 +0000 | [diff] [blame] | 596 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 597 | #endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 598 | |
| 599 | |
| 600 | A &_addressSpace; |
| 601 | R _registers; |
| 602 | unw_proc_info_t _info; |
| 603 | bool _unwindInfoMissing; |
| 604 | bool _isSignalFrame; |
| 605 | }; |
| 606 | |
| 607 | |
| 608 | template <typename A, typename R> |
| 609 | UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as) |
| 610 | : _addressSpace(as), _registers(context), _unwindInfoMissing(false), |
| 611 | _isSignalFrame(false) { |
Asiri Rathnayake | 98bc676 | 2016-05-26 21:45:54 +0000 | [diff] [blame] | 612 | static_assert((check_fit<UnwindCursor<A, R>, unw_cursor_t>::does_fit), |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 613 | "UnwindCursor<> does not fit in unw_cursor_t"); |
| 614 | memset(&_info, 0, sizeof(_info)); |
| 615 | } |
| 616 | |
| 617 | template <typename A, typename R> |
| 618 | UnwindCursor<A, R>::UnwindCursor(A &as, void *) |
| 619 | : _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) { |
| 620 | memset(&_info, 0, sizeof(_info)); |
| 621 | // FIXME |
| 622 | // fill in _registers from thread arg |
| 623 | } |
| 624 | |
| 625 | |
| 626 | template <typename A, typename R> |
| 627 | bool UnwindCursor<A, R>::validReg(int regNum) { |
| 628 | return _registers.validRegister(regNum); |
| 629 | } |
| 630 | |
| 631 | template <typename A, typename R> |
| 632 | unw_word_t UnwindCursor<A, R>::getReg(int regNum) { |
| 633 | return _registers.getRegister(regNum); |
| 634 | } |
| 635 | |
| 636 | template <typename A, typename R> |
| 637 | void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) { |
| 638 | _registers.setRegister(regNum, (typename A::pint_t)value); |
| 639 | } |
| 640 | |
| 641 | template <typename A, typename R> |
| 642 | bool UnwindCursor<A, R>::validFloatReg(int regNum) { |
| 643 | return _registers.validFloatRegister(regNum); |
| 644 | } |
| 645 | |
| 646 | template <typename A, typename R> |
| 647 | unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) { |
| 648 | return _registers.getFloatRegister(regNum); |
| 649 | } |
| 650 | |
| 651 | template <typename A, typename R> |
| 652 | void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) { |
| 653 | _registers.setFloatRegister(regNum, value); |
| 654 | } |
| 655 | |
| 656 | template <typename A, typename R> void UnwindCursor<A, R>::jumpto() { |
| 657 | _registers.jumpto(); |
| 658 | } |
| 659 | |
| 660 | #ifdef __arm__ |
| 661 | template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() { |
| 662 | _registers.saveVFPAsX(); |
| 663 | } |
| 664 | #endif |
| 665 | |
| 666 | template <typename A, typename R> |
| 667 | const char *UnwindCursor<A, R>::getRegisterName(int regNum) { |
| 668 | return _registers.getRegisterName(regNum); |
| 669 | } |
| 670 | |
| 671 | template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() { |
| 672 | return _isSignalFrame; |
| 673 | } |
| 674 | |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 675 | #if _LIBUNWIND_ARM_EHABI |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 676 | struct EHABIIndexEntry { |
| 677 | uint32_t functionOffset; |
| 678 | uint32_t data; |
| 679 | }; |
| 680 | |
| 681 | template<typename A> |
| 682 | struct EHABISectionIterator { |
| 683 | typedef EHABISectionIterator _Self; |
| 684 | |
| 685 | typedef std::random_access_iterator_tag iterator_category; |
| 686 | typedef typename A::pint_t value_type; |
| 687 | typedef typename A::pint_t* pointer; |
| 688 | typedef typename A::pint_t& reference; |
| 689 | typedef size_t size_type; |
| 690 | typedef size_t difference_type; |
| 691 | |
| 692 | static _Self begin(A& addressSpace, const UnwindInfoSections& sects) { |
| 693 | return _Self(addressSpace, sects, 0); |
| 694 | } |
| 695 | static _Self end(A& addressSpace, const UnwindInfoSections& sects) { |
Ed Schouten | 9979472 | 2017-03-07 15:21:57 +0000 | [diff] [blame] | 696 | return _Self(addressSpace, sects, |
| 697 | sects.arm_section_length / sizeof(EHABIIndexEntry)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 698 | } |
| 699 | |
| 700 | EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i) |
| 701 | : _i(i), _addressSpace(&addressSpace), _sects(§s) {} |
| 702 | |
| 703 | _Self& operator++() { ++_i; return *this; } |
| 704 | _Self& operator+=(size_t a) { _i += a; return *this; } |
| 705 | _Self& operator--() { assert(_i > 0); --_i; return *this; } |
| 706 | _Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; } |
| 707 | |
| 708 | _Self operator+(size_t a) { _Self out = *this; out._i += a; return out; } |
| 709 | _Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; } |
| 710 | |
| 711 | size_t operator-(const _Self& other) { return _i - other._i; } |
| 712 | |
| 713 | bool operator==(const _Self& other) const { |
| 714 | assert(_addressSpace == other._addressSpace); |
| 715 | assert(_sects == other._sects); |
| 716 | return _i == other._i; |
| 717 | } |
| 718 | |
| 719 | typename A::pint_t operator*() const { return functionAddress(); } |
| 720 | |
| 721 | typename A::pint_t functionAddress() const { |
| 722 | typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( |
| 723 | EHABIIndexEntry, _i, functionOffset); |
| 724 | return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr)); |
| 725 | } |
| 726 | |
| 727 | typename A::pint_t dataAddress() { |
| 728 | typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof( |
| 729 | EHABIIndexEntry, _i, data); |
| 730 | return indexAddr; |
| 731 | } |
| 732 | |
| 733 | private: |
| 734 | size_t _i; |
| 735 | A* _addressSpace; |
| 736 | const UnwindInfoSections* _sects; |
| 737 | }; |
| 738 | |
| 739 | template <typename A, typename R> |
| 740 | bool UnwindCursor<A, R>::getInfoFromEHABISection( |
| 741 | pint_t pc, |
| 742 | const UnwindInfoSections §s) { |
| 743 | EHABISectionIterator<A> begin = |
| 744 | EHABISectionIterator<A>::begin(_addressSpace, sects); |
| 745 | EHABISectionIterator<A> end = |
| 746 | EHABISectionIterator<A>::end(_addressSpace, sects); |
| 747 | |
| 748 | EHABISectionIterator<A> itNextPC = std::upper_bound(begin, end, pc); |
| 749 | if (itNextPC == begin || itNextPC == end) |
| 750 | return false; |
| 751 | EHABISectionIterator<A> itThisPC = itNextPC - 1; |
| 752 | |
| 753 | pint_t thisPC = itThisPC.functionAddress(); |
| 754 | pint_t nextPC = itNextPC.functionAddress(); |
| 755 | pint_t indexDataAddr = itThisPC.dataAddress(); |
| 756 | |
| 757 | if (indexDataAddr == 0) |
| 758 | return false; |
| 759 | |
| 760 | uint32_t indexData = _addressSpace.get32(indexDataAddr); |
| 761 | if (indexData == UNW_EXIDX_CANTUNWIND) |
| 762 | return false; |
| 763 | |
| 764 | // If the high bit is set, the exception handling table entry is inline inside |
| 765 | // the index table entry on the second word (aka |indexDataAddr|). Otherwise, |
| 766 | // the table points at an offset in the exception handling table (section 5 EHABI). |
| 767 | pint_t exceptionTableAddr; |
| 768 | uint32_t exceptionTableData; |
| 769 | bool isSingleWordEHT; |
| 770 | if (indexData & 0x80000000) { |
| 771 | exceptionTableAddr = indexDataAddr; |
| 772 | // TODO(ajwong): Should this data be 0? |
| 773 | exceptionTableData = indexData; |
| 774 | isSingleWordEHT = true; |
| 775 | } else { |
| 776 | exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData); |
| 777 | exceptionTableData = _addressSpace.get32(exceptionTableAddr); |
| 778 | isSingleWordEHT = false; |
| 779 | } |
| 780 | |
| 781 | // Now we know the 3 things: |
| 782 | // exceptionTableAddr -- exception handler table entry. |
| 783 | // exceptionTableData -- the data inside the first word of the eht entry. |
| 784 | // isSingleWordEHT -- whether the entry is in the index. |
| 785 | unw_word_t personalityRoutine = 0xbadf00d; |
| 786 | bool scope32 = false; |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 787 | uintptr_t lsda; |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 788 | |
| 789 | // If the high bit in the exception handling table entry is set, the entry is |
| 790 | // in compact form (section 6.3 EHABI). |
| 791 | if (exceptionTableData & 0x80000000) { |
| 792 | // Grab the index of the personality routine from the compact form. |
| 793 | uint32_t choice = (exceptionTableData & 0x0f000000) >> 24; |
| 794 | uint32_t extraWords = 0; |
| 795 | switch (choice) { |
| 796 | case 0: |
| 797 | personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0; |
| 798 | extraWords = 0; |
| 799 | scope32 = false; |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 800 | lsda = isSingleWordEHT ? 0 : (exceptionTableAddr + 4); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 801 | break; |
| 802 | case 1: |
| 803 | personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1; |
| 804 | extraWords = (exceptionTableData & 0x00ff0000) >> 16; |
| 805 | scope32 = false; |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 806 | lsda = exceptionTableAddr + (extraWords + 1) * 4; |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 807 | break; |
| 808 | case 2: |
| 809 | personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2; |
| 810 | extraWords = (exceptionTableData & 0x00ff0000) >> 16; |
| 811 | scope32 = true; |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 812 | lsda = exceptionTableAddr + (extraWords + 1) * 4; |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 813 | break; |
| 814 | default: |
| 815 | _LIBUNWIND_ABORT("unknown personality routine"); |
| 816 | return false; |
| 817 | } |
| 818 | |
| 819 | if (isSingleWordEHT) { |
| 820 | if (extraWords != 0) { |
| 821 | _LIBUNWIND_ABORT("index inlined table detected but pr function " |
| 822 | "requires extra words"); |
| 823 | return false; |
| 824 | } |
| 825 | } |
| 826 | } else { |
| 827 | pint_t personalityAddr = |
| 828 | exceptionTableAddr + signExtendPrel31(exceptionTableData); |
| 829 | personalityRoutine = personalityAddr; |
| 830 | |
| 831 | // ARM EHABI # 6.2, # 9.2 |
| 832 | // |
| 833 | // +---- ehtp |
| 834 | // v |
| 835 | // +--------------------------------------+ |
| 836 | // | +--------+--------+--------+-------+ | |
| 837 | // | |0| prel31 to personalityRoutine | | |
| 838 | // | +--------+--------+--------+-------+ | |
| 839 | // | | N | unwind opcodes | | <-- UnwindData |
| 840 | // | +--------+--------+--------+-------+ | |
| 841 | // | | Word 2 unwind opcodes | | |
| 842 | // | +--------+--------+--------+-------+ | |
| 843 | // | ... | |
| 844 | // | +--------+--------+--------+-------+ | |
| 845 | // | | Word N unwind opcodes | | |
| 846 | // | +--------+--------+--------+-------+ | |
| 847 | // | | LSDA | | <-- lsda |
| 848 | // | | ... | | |
| 849 | // | +--------+--------+--------+-------+ | |
| 850 | // +--------------------------------------+ |
| 851 | |
| 852 | uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1; |
| 853 | uint32_t FirstDataWord = *UnwindData; |
| 854 | size_t N = ((FirstDataWord >> 24) & 0xff); |
| 855 | size_t NDataWords = N + 1; |
| 856 | lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords); |
| 857 | } |
| 858 | |
| 859 | _info.start_ip = thisPC; |
| 860 | _info.end_ip = nextPC; |
| 861 | _info.handler = personalityRoutine; |
| 862 | _info.unwind_info = exceptionTableAddr; |
| 863 | _info.lsda = lsda; |
| 864 | // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0. |
| 865 | _info.flags = isSingleWordEHT ? 1 : 0 | scope32 ? 0x2 : 0; // Use enum? |
| 866 | |
| 867 | return true; |
| 868 | } |
| 869 | #endif |
| 870 | |
| 871 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 872 | template <typename A, typename R> |
| 873 | bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc, |
| 874 | const UnwindInfoSections §s, |
| 875 | uint32_t fdeSectionOffsetHint) { |
| 876 | typename CFI_Parser<A>::FDE_Info fdeInfo; |
| 877 | typename CFI_Parser<A>::CIE_Info cieInfo; |
| 878 | bool foundFDE = false; |
| 879 | bool foundInCache = false; |
| 880 | // If compact encoding table gave offset into dwarf section, go directly there |
| 881 | if (fdeSectionOffsetHint != 0) { |
| 882 | foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, |
| 883 | (uint32_t)sects.dwarf_section_length, |
| 884 | sects.dwarf_section + fdeSectionOffsetHint, |
| 885 | &fdeInfo, &cieInfo); |
| 886 | } |
| 887 | #if _LIBUNWIND_SUPPORT_DWARF_INDEX |
| 888 | if (!foundFDE && (sects.dwarf_index_section != 0)) { |
| 889 | foundFDE = EHHeaderParser<A>::findFDE( |
| 890 | _addressSpace, pc, sects.dwarf_index_section, |
| 891 | (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo); |
| 892 | } |
| 893 | #endif |
| 894 | if (!foundFDE) { |
| 895 | // otherwise, search cache of previously found FDEs. |
| 896 | pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc); |
| 897 | if (cachedFDE != 0) { |
| 898 | foundFDE = |
| 899 | CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, |
| 900 | (uint32_t)sects.dwarf_section_length, |
| 901 | cachedFDE, &fdeInfo, &cieInfo); |
| 902 | foundInCache = foundFDE; |
| 903 | } |
| 904 | } |
| 905 | if (!foundFDE) { |
| 906 | // Still not found, do full scan of __eh_frame section. |
| 907 | foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section, |
| 908 | (uint32_t)sects.dwarf_section_length, 0, |
| 909 | &fdeInfo, &cieInfo); |
| 910 | } |
| 911 | if (foundFDE) { |
| 912 | typename CFI_Parser<A>::PrologInfo prolog; |
| 913 | if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc, |
| 914 | &prolog)) { |
| 915 | // Save off parsed FDE info |
| 916 | _info.start_ip = fdeInfo.pcStart; |
| 917 | _info.end_ip = fdeInfo.pcEnd; |
| 918 | _info.lsda = fdeInfo.lsda; |
| 919 | _info.handler = cieInfo.personality; |
| 920 | _info.gp = prolog.spExtraArgSize; |
| 921 | _info.flags = 0; |
| 922 | _info.format = dwarfEncoding(); |
| 923 | _info.unwind_info = fdeInfo.fdeStart; |
| 924 | _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; |
| 925 | _info.extra = (unw_word_t) sects.dso_base; |
| 926 | |
| 927 | // Add to cache (to make next lookup faster) if we had no hint |
| 928 | // and there was no index. |
| 929 | if (!foundInCache && (fdeSectionOffsetHint == 0)) { |
| 930 | #if _LIBUNWIND_SUPPORT_DWARF_INDEX |
| 931 | if (sects.dwarf_index_section == 0) |
| 932 | #endif |
| 933 | DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd, |
| 934 | fdeInfo.fdeStart); |
| 935 | } |
| 936 | return true; |
| 937 | } |
| 938 | } |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 939 | //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX", (uint64_t)pc); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 940 | return false; |
| 941 | } |
| 942 | #endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 943 | |
| 944 | |
| 945 | #if _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 946 | template <typename A, typename R> |
| 947 | bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc, |
| 948 | const UnwindInfoSections §s) { |
| 949 | const bool log = false; |
| 950 | if (log) |
| 951 | fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n", |
| 952 | (uint64_t)pc, (uint64_t)sects.dso_base); |
| 953 | |
| 954 | const UnwindSectionHeader<A> sectionHeader(_addressSpace, |
| 955 | sects.compact_unwind_section); |
| 956 | if (sectionHeader.version() != UNWIND_SECTION_VERSION) |
| 957 | return false; |
| 958 | |
| 959 | // do a binary search of top level index to find page with unwind info |
| 960 | pint_t targetFunctionOffset = pc - sects.dso_base; |
| 961 | const UnwindSectionIndexArray<A> topIndex(_addressSpace, |
| 962 | sects.compact_unwind_section |
| 963 | + sectionHeader.indexSectionOffset()); |
| 964 | uint32_t low = 0; |
| 965 | uint32_t high = sectionHeader.indexCount(); |
| 966 | uint32_t last = high - 1; |
| 967 | while (low < high) { |
| 968 | uint32_t mid = (low + high) / 2; |
| 969 | //if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n", |
| 970 | //mid, low, high, topIndex.functionOffset(mid)); |
| 971 | if (topIndex.functionOffset(mid) <= targetFunctionOffset) { |
| 972 | if ((mid == last) || |
| 973 | (topIndex.functionOffset(mid + 1) > targetFunctionOffset)) { |
| 974 | low = mid; |
| 975 | break; |
| 976 | } else { |
| 977 | low = mid + 1; |
| 978 | } |
| 979 | } else { |
| 980 | high = mid; |
| 981 | } |
| 982 | } |
| 983 | const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low); |
| 984 | const uint32_t firstLevelNextPageFunctionOffset = |
| 985 | topIndex.functionOffset(low + 1); |
| 986 | const pint_t secondLevelAddr = |
| 987 | sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low); |
| 988 | const pint_t lsdaArrayStartAddr = |
| 989 | sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low); |
| 990 | const pint_t lsdaArrayEndAddr = |
| 991 | sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1); |
| 992 | if (log) |
| 993 | fprintf(stderr, "\tfirst level search for result index=%d " |
| 994 | "to secondLevelAddr=0x%llX\n", |
| 995 | low, (uint64_t) secondLevelAddr); |
| 996 | // do a binary search of second level page index |
| 997 | uint32_t encoding = 0; |
| 998 | pint_t funcStart = 0; |
| 999 | pint_t funcEnd = 0; |
| 1000 | pint_t lsda = 0; |
| 1001 | pint_t personality = 0; |
| 1002 | uint32_t pageKind = _addressSpace.get32(secondLevelAddr); |
| 1003 | if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) { |
| 1004 | // regular page |
| 1005 | UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace, |
| 1006 | secondLevelAddr); |
| 1007 | UnwindSectionRegularArray<A> pageIndex( |
| 1008 | _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); |
| 1009 | // binary search looks for entry with e where index[e].offset <= pc < |
| 1010 | // index[e+1].offset |
| 1011 | if (log) |
| 1012 | fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in " |
| 1013 | "regular page starting at secondLevelAddr=0x%llX\n", |
| 1014 | (uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr); |
| 1015 | low = 0; |
| 1016 | high = pageHeader.entryCount(); |
| 1017 | while (low < high) { |
| 1018 | uint32_t mid = (low + high) / 2; |
| 1019 | if (pageIndex.functionOffset(mid) <= targetFunctionOffset) { |
| 1020 | if (mid == (uint32_t)(pageHeader.entryCount() - 1)) { |
| 1021 | // at end of table |
| 1022 | low = mid; |
| 1023 | funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; |
| 1024 | break; |
| 1025 | } else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) { |
| 1026 | // next is too big, so we found it |
| 1027 | low = mid; |
| 1028 | funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base; |
| 1029 | break; |
| 1030 | } else { |
| 1031 | low = mid + 1; |
| 1032 | } |
| 1033 | } else { |
| 1034 | high = mid; |
| 1035 | } |
| 1036 | } |
| 1037 | encoding = pageIndex.encoding(low); |
| 1038 | funcStart = pageIndex.functionOffset(low) + sects.dso_base; |
| 1039 | if (pc < funcStart) { |
| 1040 | if (log) |
| 1041 | fprintf( |
| 1042 | stderr, |
| 1043 | "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", |
| 1044 | (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); |
| 1045 | return false; |
| 1046 | } |
| 1047 | if (pc > funcEnd) { |
| 1048 | if (log) |
| 1049 | fprintf( |
| 1050 | stderr, |
| 1051 | "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n", |
| 1052 | (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd); |
| 1053 | return false; |
| 1054 | } |
| 1055 | } else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) { |
| 1056 | // compressed page |
| 1057 | UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace, |
| 1058 | secondLevelAddr); |
| 1059 | UnwindSectionCompressedArray<A> pageIndex( |
| 1060 | _addressSpace, secondLevelAddr + pageHeader.entryPageOffset()); |
| 1061 | const uint32_t targetFunctionPageOffset = |
| 1062 | (uint32_t)(targetFunctionOffset - firstLevelFunctionOffset); |
| 1063 | // binary search looks for entry with e where index[e].offset <= pc < |
| 1064 | // index[e+1].offset |
| 1065 | if (log) |
| 1066 | fprintf(stderr, "\tbinary search of compressed page starting at " |
| 1067 | "secondLevelAddr=0x%llX\n", |
| 1068 | (uint64_t) secondLevelAddr); |
| 1069 | low = 0; |
| 1070 | last = pageHeader.entryCount() - 1; |
| 1071 | high = pageHeader.entryCount(); |
| 1072 | while (low < high) { |
| 1073 | uint32_t mid = (low + high) / 2; |
| 1074 | if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) { |
| 1075 | if ((mid == last) || |
| 1076 | (pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) { |
| 1077 | low = mid; |
| 1078 | break; |
| 1079 | } else { |
| 1080 | low = mid + 1; |
| 1081 | } |
| 1082 | } else { |
| 1083 | high = mid; |
| 1084 | } |
| 1085 | } |
| 1086 | funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset |
| 1087 | + sects.dso_base; |
| 1088 | if (low < last) |
| 1089 | funcEnd = |
| 1090 | pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset |
| 1091 | + sects.dso_base; |
| 1092 | else |
| 1093 | funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base; |
| 1094 | if (pc < funcStart) { |
| 1095 | _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second " |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 1096 | "level compressed unwind table. funcStart=0x%llX", |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1097 | (uint64_t) pc, (uint64_t) funcStart); |
| 1098 | return false; |
| 1099 | } |
| 1100 | if (pc > funcEnd) { |
| 1101 | _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second " |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 1102 | "level compressed unwind table. funcEnd=0x%llX", |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1103 | (uint64_t) pc, (uint64_t) funcEnd); |
| 1104 | return false; |
| 1105 | } |
| 1106 | uint16_t encodingIndex = pageIndex.encodingIndex(low); |
| 1107 | if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) { |
| 1108 | // encoding is in common table in section header |
| 1109 | encoding = _addressSpace.get32( |
| 1110 | sects.compact_unwind_section + |
| 1111 | sectionHeader.commonEncodingsArraySectionOffset() + |
| 1112 | encodingIndex * sizeof(uint32_t)); |
| 1113 | } else { |
| 1114 | // encoding is in page specific table |
| 1115 | uint16_t pageEncodingIndex = |
| 1116 | encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount(); |
| 1117 | encoding = _addressSpace.get32(secondLevelAddr + |
| 1118 | pageHeader.encodingsPageOffset() + |
| 1119 | pageEncodingIndex * sizeof(uint32_t)); |
| 1120 | } |
| 1121 | } else { |
| 1122 | _LIBUNWIND_DEBUG_LOG("malformed __unwind_info at 0x%0llX bad second " |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 1123 | "level page", |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1124 | (uint64_t) sects.compact_unwind_section); |
| 1125 | return false; |
| 1126 | } |
| 1127 | |
| 1128 | // look up LSDA, if encoding says function has one |
| 1129 | if (encoding & UNWIND_HAS_LSDA) { |
| 1130 | UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr); |
| 1131 | uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base); |
| 1132 | low = 0; |
| 1133 | high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) / |
| 1134 | sizeof(unwind_info_section_header_lsda_index_entry); |
| 1135 | // binary search looks for entry with exact match for functionOffset |
| 1136 | if (log) |
| 1137 | fprintf(stderr, |
| 1138 | "\tbinary search of lsda table for targetFunctionOffset=0x%08X\n", |
| 1139 | funcStartOffset); |
| 1140 | while (low < high) { |
| 1141 | uint32_t mid = (low + high) / 2; |
| 1142 | if (lsdaIndex.functionOffset(mid) == funcStartOffset) { |
| 1143 | lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base; |
| 1144 | break; |
| 1145 | } else if (lsdaIndex.functionOffset(mid) < funcStartOffset) { |
| 1146 | low = mid + 1; |
| 1147 | } else { |
| 1148 | high = mid; |
| 1149 | } |
| 1150 | } |
| 1151 | if (lsda == 0) { |
| 1152 | _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for " |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 1153 | "pc=0x%0llX, but lsda table has no entry", |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1154 | encoding, (uint64_t) pc); |
| 1155 | return false; |
| 1156 | } |
| 1157 | } |
| 1158 | |
| 1159 | // extact personality routine, if encoding says function has one |
| 1160 | uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >> |
| 1161 | (__builtin_ctz(UNWIND_PERSONALITY_MASK)); |
| 1162 | if (personalityIndex != 0) { |
| 1163 | --personalityIndex; // change 1-based to zero-based index |
| 1164 | if (personalityIndex > sectionHeader.personalityArrayCount()) { |
| 1165 | _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, " |
Ed Maste | adc2908 | 2016-08-30 15:38:10 +0000 | [diff] [blame] | 1166 | "but personality table has only %d entires", |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1167 | encoding, personalityIndex, |
| 1168 | sectionHeader.personalityArrayCount()); |
| 1169 | return false; |
| 1170 | } |
| 1171 | int32_t personalityDelta = (int32_t)_addressSpace.get32( |
| 1172 | sects.compact_unwind_section + |
| 1173 | sectionHeader.personalityArraySectionOffset() + |
| 1174 | personalityIndex * sizeof(uint32_t)); |
| 1175 | pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta; |
| 1176 | personality = _addressSpace.getP(personalityPointer); |
| 1177 | if (log) |
| 1178 | fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " |
| 1179 | "personalityDelta=0x%08X, personality=0x%08llX\n", |
| 1180 | (uint64_t) pc, personalityDelta, (uint64_t) personality); |
| 1181 | } |
| 1182 | |
| 1183 | if (log) |
| 1184 | fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), " |
| 1185 | "encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n", |
| 1186 | (uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart); |
| 1187 | _info.start_ip = funcStart; |
| 1188 | _info.end_ip = funcEnd; |
| 1189 | _info.lsda = lsda; |
| 1190 | _info.handler = personality; |
| 1191 | _info.gp = 0; |
| 1192 | _info.flags = 0; |
| 1193 | _info.format = encoding; |
| 1194 | _info.unwind_info = 0; |
| 1195 | _info.unwind_info_size = 0; |
| 1196 | _info.extra = sects.dso_base; |
| 1197 | return true; |
| 1198 | } |
| 1199 | #endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 1200 | |
| 1201 | |
| 1202 | template <typename A, typename R> |
| 1203 | void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) { |
| 1204 | pint_t pc = (pint_t)this->getReg(UNW_REG_IP); |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 1205 | #if _LIBUNWIND_ARM_EHABI |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1206 | // Remove the thumb bit so the IP represents the actual instruction address. |
| 1207 | // This matches the behaviour of _Unwind_GetIP on arm. |
| 1208 | pc &= (pint_t)~0x1; |
| 1209 | #endif |
| 1210 | |
| 1211 | // If the last line of a function is a "throw" the compiler sometimes |
| 1212 | // emits no instructions after the call to __cxa_throw. This means |
| 1213 | // the return address is actually the start of the next function. |
| 1214 | // To disambiguate this, back up the pc when we know it is a return |
| 1215 | // address. |
| 1216 | if (isReturnAddress) |
| 1217 | --pc; |
| 1218 | |
| 1219 | // Ask address space object to find unwind sections for this pc. |
| 1220 | UnwindInfoSections sects; |
| 1221 | if (_addressSpace.findUnwindSections(pc, sects)) { |
| 1222 | #if _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 1223 | // If there is a compact unwind encoding table, look there first. |
| 1224 | if (sects.compact_unwind_section != 0) { |
| 1225 | if (this->getInfoFromCompactEncodingSection(pc, sects)) { |
| 1226 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 1227 | // Found info in table, done unless encoding says to use dwarf. |
| 1228 | uint32_t dwarfOffset; |
| 1229 | if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) { |
| 1230 | if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) { |
| 1231 | // found info in dwarf, done |
| 1232 | return; |
| 1233 | } |
| 1234 | } |
| 1235 | #endif |
| 1236 | // If unwind table has entry, but entry says there is no unwind info, |
| 1237 | // record that we have no unwind info. |
| 1238 | if (_info.format == 0) |
| 1239 | _unwindInfoMissing = true; |
| 1240 | return; |
| 1241 | } |
| 1242 | } |
| 1243 | #endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 1244 | |
| 1245 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 1246 | // If there is dwarf unwind info, look there next. |
| 1247 | if (sects.dwarf_section != 0) { |
| 1248 | if (this->getInfoFromDwarfSection(pc, sects)) { |
| 1249 | // found info in dwarf, done |
| 1250 | return; |
| 1251 | } |
| 1252 | } |
| 1253 | #endif |
| 1254 | |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 1255 | #if _LIBUNWIND_ARM_EHABI |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1256 | // If there is ARM EHABI unwind info, look there next. |
| 1257 | if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects)) |
| 1258 | return; |
| 1259 | #endif |
| 1260 | } |
| 1261 | |
| 1262 | #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 1263 | // There is no static unwind info for this pc. Look to see if an FDE was |
| 1264 | // dynamically registered for it. |
| 1265 | pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc); |
| 1266 | if (cachedFDE != 0) { |
| 1267 | CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; |
| 1268 | CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; |
| 1269 | const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace, |
| 1270 | cachedFDE, &fdeInfo, &cieInfo); |
| 1271 | if (msg == NULL) { |
| 1272 | typename CFI_Parser<A>::PrologInfo prolog; |
| 1273 | if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, |
| 1274 | pc, &prolog)) { |
| 1275 | // save off parsed FDE info |
| 1276 | _info.start_ip = fdeInfo.pcStart; |
| 1277 | _info.end_ip = fdeInfo.pcEnd; |
| 1278 | _info.lsda = fdeInfo.lsda; |
| 1279 | _info.handler = cieInfo.personality; |
| 1280 | _info.gp = prolog.spExtraArgSize; |
| 1281 | // Some frameless functions need SP |
| 1282 | // altered when resuming in function. |
| 1283 | _info.flags = 0; |
| 1284 | _info.format = dwarfEncoding(); |
| 1285 | _info.unwind_info = fdeInfo.fdeStart; |
| 1286 | _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; |
| 1287 | _info.extra = 0; |
| 1288 | return; |
| 1289 | } |
| 1290 | } |
| 1291 | } |
| 1292 | |
| 1293 | // Lastly, ask AddressSpace object about platform specific ways to locate |
| 1294 | // other FDEs. |
| 1295 | pint_t fde; |
| 1296 | if (_addressSpace.findOtherFDE(pc, fde)) { |
| 1297 | CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo; |
| 1298 | CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo; |
| 1299 | if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) { |
| 1300 | // Double check this FDE is for a function that includes the pc. |
| 1301 | if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) { |
| 1302 | typename CFI_Parser<A>::PrologInfo prolog; |
| 1303 | if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, |
| 1304 | cieInfo, pc, &prolog)) { |
| 1305 | // save off parsed FDE info |
| 1306 | _info.start_ip = fdeInfo.pcStart; |
| 1307 | _info.end_ip = fdeInfo.pcEnd; |
| 1308 | _info.lsda = fdeInfo.lsda; |
| 1309 | _info.handler = cieInfo.personality; |
| 1310 | _info.gp = prolog.spExtraArgSize; |
| 1311 | _info.flags = 0; |
| 1312 | _info.format = dwarfEncoding(); |
| 1313 | _info.unwind_info = fdeInfo.fdeStart; |
| 1314 | _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength; |
| 1315 | _info.extra = 0; |
| 1316 | return; |
| 1317 | } |
| 1318 | } |
| 1319 | } |
| 1320 | } |
| 1321 | #endif // #if _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 1322 | |
| 1323 | // no unwind info, flag that we can't reliably unwind |
| 1324 | _unwindInfoMissing = true; |
| 1325 | } |
| 1326 | |
| 1327 | template <typename A, typename R> |
| 1328 | int UnwindCursor<A, R>::step() { |
| 1329 | // Bottom of stack is defined is when unwind info cannot be found. |
| 1330 | if (_unwindInfoMissing) |
| 1331 | return UNW_STEP_END; |
| 1332 | |
| 1333 | // Use unwinding info to modify register set as if function returned. |
| 1334 | int result; |
| 1335 | #if _LIBUNWIND_SUPPORT_COMPACT_UNWIND |
| 1336 | result = this->stepWithCompactEncoding(); |
| 1337 | #elif _LIBUNWIND_SUPPORT_DWARF_UNWIND |
| 1338 | result = this->stepWithDwarfFDE(); |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 1339 | #elif _LIBUNWIND_ARM_EHABI |
Logan Chien | 9f323e0 | 2015-05-29 15:33:38 +0000 | [diff] [blame] | 1340 | result = this->stepWithEHABI(); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1341 | #else |
| 1342 | #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \ |
| 1343 | _LIBUNWIND_SUPPORT_DWARF_UNWIND or \ |
Logan Chien | 6127858 | 2015-07-19 15:23:10 +0000 | [diff] [blame] | 1344 | _LIBUNWIND_ARM_EHABI |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1345 | #endif |
| 1346 | |
| 1347 | // update info based on new PC |
| 1348 | if (result == UNW_STEP_SUCCESS) { |
| 1349 | this->setInfoBasedOnIPRegister(true); |
| 1350 | if (_unwindInfoMissing) |
| 1351 | return UNW_STEP_END; |
| 1352 | if (_info.gp) |
| 1353 | setReg(UNW_REG_SP, getReg(UNW_REG_SP) + _info.gp); |
| 1354 | } |
| 1355 | |
| 1356 | return result; |
| 1357 | } |
| 1358 | |
| 1359 | template <typename A, typename R> |
| 1360 | void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) { |
| 1361 | *info = _info; |
| 1362 | } |
| 1363 | |
| 1364 | template <typename A, typename R> |
| 1365 | bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen, |
| 1366 | unw_word_t *offset) { |
| 1367 | return _addressSpace.findFunctionName((pint_t)this->getReg(UNW_REG_IP), |
| 1368 | buf, bufLen, offset); |
| 1369 | } |
| 1370 | |
| 1371 | } // namespace libunwind |
| 1372 | |
| 1373 | #endif // __UNWINDCURSOR_HPP__ |