Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 1 | //===--------------------------- DwarfParser.hpp --------------------------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is dual licensed under the MIT and the University of Illinois Open |
| 6 | // Source Licenses. See LICENSE.TXT for details. |
| 7 | // |
| 8 | // |
| 9 | // Parses DWARF CFIs (FDEs and CIEs). |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #ifndef __DWARF_PARSER_HPP__ |
| 14 | #define __DWARF_PARSER_HPP__ |
| 15 | |
| 16 | #include <inttypes.h> |
| 17 | #include <stdint.h> |
| 18 | #include <stdio.h> |
| 19 | #include <stdlib.h> |
| 20 | |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 21 | #include "libunwind.h" |
| 22 | #include "dwarf2.h" |
| 23 | |
| 24 | #include "AddressSpace.hpp" |
| 25 | |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 26 | extern "C" bool logDWARF(); |
| 27 | |
| 28 | #define _LIBUNWIND_TRACE_DWARF(...) \ |
| 29 | do { \ |
| 30 | if (logDWARF()) \ |
| 31 | fprintf(stderr, __VA_ARGS__); \ |
| 32 | } while (0) |
| 33 | |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 34 | namespace libunwind { |
| 35 | |
| 36 | /// CFI_Parser does basic parsing of a CFI (Call Frame Information) records. |
Ed Maste | 63469ff | 2016-07-19 17:15:50 +0000 | [diff] [blame] | 37 | /// See DWARF Spec for details: |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 38 | /// http://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html |
| 39 | /// |
| 40 | template <typename A> |
| 41 | class CFI_Parser { |
| 42 | public: |
| 43 | typedef typename A::pint_t pint_t; |
| 44 | |
| 45 | /// Information encoded in a CIE (Common Information Entry) |
| 46 | struct CIE_Info { |
| 47 | pint_t cieStart; |
| 48 | pint_t cieLength; |
| 49 | pint_t cieInstructions; |
| 50 | uint8_t pointerEncoding; |
| 51 | uint8_t lsdaEncoding; |
| 52 | uint8_t personalityEncoding; |
| 53 | uint8_t personalityOffsetInCIE; |
| 54 | pint_t personality; |
| 55 | uint32_t codeAlignFactor; |
| 56 | int dataAlignFactor; |
| 57 | bool isSignalFrame; |
| 58 | bool fdesHaveAugmentationData; |
| 59 | uint8_t returnAddressRegister; |
| 60 | }; |
| 61 | |
| 62 | /// Information about an FDE (Frame Description Entry) |
| 63 | struct FDE_Info { |
| 64 | pint_t fdeStart; |
| 65 | pint_t fdeLength; |
| 66 | pint_t fdeInstructions; |
| 67 | pint_t pcStart; |
| 68 | pint_t pcEnd; |
| 69 | pint_t lsda; |
| 70 | }; |
| 71 | |
| 72 | enum { |
Ed Maste | f9f7928 | 2016-07-20 15:19:09 +0000 | [diff] [blame] | 73 | kMaxRegisterNumber = _LIBUNWIND_HIGHEST_DWARF_REGISTER |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 74 | }; |
| 75 | enum RegisterSavedWhere { |
| 76 | kRegisterUnused, |
| 77 | kRegisterInCFA, |
| 78 | kRegisterOffsetFromCFA, |
| 79 | kRegisterInRegister, |
| 80 | kRegisterAtExpression, |
| 81 | kRegisterIsExpression |
| 82 | }; |
| 83 | struct RegisterLocation { |
| 84 | RegisterSavedWhere location; |
| 85 | int64_t value; |
| 86 | }; |
| 87 | /// Information about a frame layout and registers saved determined |
Ed Maste | 63469ff | 2016-07-19 17:15:50 +0000 | [diff] [blame] | 88 | /// by "running" the DWARF FDE "instructions" |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 89 | struct PrologInfo { |
| 90 | uint32_t cfaRegister; |
| 91 | int32_t cfaRegisterOffset; // CFA = (cfaRegister)+cfaRegisterOffset |
| 92 | int64_t cfaExpression; // CFA = expression |
| 93 | uint32_t spExtraArgSize; |
| 94 | uint32_t codeOffsetAtStackDecrement; |
| 95 | bool registersInOtherRegisters; |
| 96 | bool sameValueUsed; |
| 97 | RegisterLocation savedRegisters[kMaxRegisterNumber]; |
| 98 | }; |
| 99 | |
| 100 | struct PrologInfoStackEntry { |
| 101 | PrologInfoStackEntry(PrologInfoStackEntry *n, const PrologInfo &i) |
| 102 | : next(n), info(i) {} |
| 103 | PrologInfoStackEntry *next; |
| 104 | PrologInfo info; |
| 105 | }; |
| 106 | |
| 107 | static bool findFDE(A &addressSpace, pint_t pc, pint_t ehSectionStart, |
| 108 | uint32_t sectionLength, pint_t fdeHint, FDE_Info *fdeInfo, |
| 109 | CIE_Info *cieInfo); |
| 110 | static const char *decodeFDE(A &addressSpace, pint_t fdeStart, |
| 111 | FDE_Info *fdeInfo, CIE_Info *cieInfo); |
| 112 | static bool parseFDEInstructions(A &addressSpace, const FDE_Info &fdeInfo, |
| 113 | const CIE_Info &cieInfo, pint_t upToPC, |
| 114 | PrologInfo *results); |
| 115 | |
| 116 | static const char *parseCIE(A &addressSpace, pint_t cie, CIE_Info *cieInfo); |
| 117 | |
| 118 | private: |
| 119 | static bool parseInstructions(A &addressSpace, pint_t instructions, |
| 120 | pint_t instructionsEnd, const CIE_Info &cieInfo, |
| 121 | pint_t pcoffset, |
| 122 | PrologInfoStackEntry *&rememberStack, |
| 123 | PrologInfo *results); |
| 124 | }; |
| 125 | |
| 126 | /// Parse a FDE into a CIE_Info and an FDE_Info |
| 127 | template <typename A> |
| 128 | const char *CFI_Parser<A>::decodeFDE(A &addressSpace, pint_t fdeStart, |
| 129 | FDE_Info *fdeInfo, CIE_Info *cieInfo) { |
| 130 | pint_t p = fdeStart; |
| 131 | pint_t cfiLength = (pint_t)addressSpace.get32(p); |
| 132 | p += 4; |
| 133 | if (cfiLength == 0xffffffff) { |
| 134 | // 0xffffffff means length is really next 8 bytes |
| 135 | cfiLength = (pint_t)addressSpace.get64(p); |
| 136 | p += 8; |
| 137 | } |
| 138 | if (cfiLength == 0) |
| 139 | return "FDE has zero length"; // end marker |
| 140 | uint32_t ciePointer = addressSpace.get32(p); |
| 141 | if (ciePointer == 0) |
| 142 | return "FDE is really a CIE"; // this is a CIE not an FDE |
| 143 | pint_t nextCFI = p + cfiLength; |
| 144 | pint_t cieStart = p - ciePointer; |
| 145 | const char *err = parseCIE(addressSpace, cieStart, cieInfo); |
| 146 | if (err != NULL) |
| 147 | return err; |
| 148 | p += 4; |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 149 | // Parse pc begin and range. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 150 | pint_t pcStart = |
| 151 | addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding); |
| 152 | pint_t pcRange = |
| 153 | addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding & 0x0F); |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 154 | // Parse rest of info. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 155 | fdeInfo->lsda = 0; |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 156 | // Check for augmentation length. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 157 | if (cieInfo->fdesHaveAugmentationData) { |
| 158 | pint_t augLen = (pint_t)addressSpace.getULEB128(p, nextCFI); |
| 159 | pint_t endOfAug = p + augLen; |
| 160 | if (cieInfo->lsdaEncoding != DW_EH_PE_omit) { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 161 | // Peek at value (without indirection). Zero means no LSDA. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 162 | pint_t lsdaStart = p; |
| 163 | if (addressSpace.getEncodedP(p, nextCFI, cieInfo->lsdaEncoding & 0x0F) != |
| 164 | 0) { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 165 | // Reset pointer and re-parse LSDA address. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 166 | p = lsdaStart; |
| 167 | fdeInfo->lsda = |
| 168 | addressSpace.getEncodedP(p, nextCFI, cieInfo->lsdaEncoding); |
| 169 | } |
| 170 | } |
| 171 | p = endOfAug; |
| 172 | } |
| 173 | fdeInfo->fdeStart = fdeStart; |
| 174 | fdeInfo->fdeLength = nextCFI - fdeStart; |
| 175 | fdeInfo->fdeInstructions = p; |
| 176 | fdeInfo->pcStart = pcStart; |
| 177 | fdeInfo->pcEnd = pcStart + pcRange; |
| 178 | return NULL; // success |
| 179 | } |
| 180 | |
| 181 | /// Scan an eh_frame section to find an FDE for a pc |
| 182 | template <typename A> |
| 183 | bool CFI_Parser<A>::findFDE(A &addressSpace, pint_t pc, pint_t ehSectionStart, |
| 184 | uint32_t sectionLength, pint_t fdeHint, |
| 185 | FDE_Info *fdeInfo, CIE_Info *cieInfo) { |
| 186 | //fprintf(stderr, "findFDE(0x%llX)\n", (long long)pc); |
| 187 | pint_t p = (fdeHint != 0) ? fdeHint : ehSectionStart; |
| 188 | const pint_t ehSectionEnd = p + sectionLength; |
| 189 | while (p < ehSectionEnd) { |
| 190 | pint_t currentCFI = p; |
| 191 | //fprintf(stderr, "findFDE() CFI at 0x%llX\n", (long long)p); |
| 192 | pint_t cfiLength = addressSpace.get32(p); |
| 193 | p += 4; |
| 194 | if (cfiLength == 0xffffffff) { |
| 195 | // 0xffffffff means length is really next 8 bytes |
| 196 | cfiLength = (pint_t)addressSpace.get64(p); |
| 197 | p += 8; |
| 198 | } |
| 199 | if (cfiLength == 0) |
| 200 | return false; // end marker |
| 201 | uint32_t id = addressSpace.get32(p); |
| 202 | if (id == 0) { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 203 | // Skip over CIEs. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 204 | p += cfiLength; |
| 205 | } else { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 206 | // Process FDE to see if it covers pc. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 207 | pint_t nextCFI = p + cfiLength; |
| 208 | uint32_t ciePointer = addressSpace.get32(p); |
| 209 | pint_t cieStart = p - ciePointer; |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 210 | // Validate pointer to CIE is within section. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 211 | if ((ehSectionStart <= cieStart) && (cieStart < ehSectionEnd)) { |
| 212 | if (parseCIE(addressSpace, cieStart, cieInfo) == NULL) { |
| 213 | p += 4; |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 214 | // Parse pc begin and range. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 215 | pint_t pcStart = |
| 216 | addressSpace.getEncodedP(p, nextCFI, cieInfo->pointerEncoding); |
| 217 | pint_t pcRange = addressSpace.getEncodedP( |
| 218 | p, nextCFI, cieInfo->pointerEncoding & 0x0F); |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 219 | // Test if pc is within the function this FDE covers. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 220 | if ((pcStart < pc) && (pc <= pcStart + pcRange)) { |
| 221 | // parse rest of info |
| 222 | fdeInfo->lsda = 0; |
| 223 | // check for augmentation length |
| 224 | if (cieInfo->fdesHaveAugmentationData) { |
| 225 | pint_t augLen = (pint_t)addressSpace.getULEB128(p, nextCFI); |
| 226 | pint_t endOfAug = p + augLen; |
| 227 | if (cieInfo->lsdaEncoding != DW_EH_PE_omit) { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 228 | // Peek at value (without indirection). Zero means no LSDA. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 229 | pint_t lsdaStart = p; |
| 230 | if (addressSpace.getEncodedP( |
| 231 | p, nextCFI, cieInfo->lsdaEncoding & 0x0F) != 0) { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 232 | // Reset pointer and re-parse LSDA address. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 233 | p = lsdaStart; |
| 234 | fdeInfo->lsda = addressSpace |
| 235 | .getEncodedP(p, nextCFI, cieInfo->lsdaEncoding); |
| 236 | } |
| 237 | } |
| 238 | p = endOfAug; |
| 239 | } |
| 240 | fdeInfo->fdeStart = currentCFI; |
| 241 | fdeInfo->fdeLength = nextCFI - currentCFI; |
| 242 | fdeInfo->fdeInstructions = p; |
| 243 | fdeInfo->pcStart = pcStart; |
| 244 | fdeInfo->pcEnd = pcStart + pcRange; |
| 245 | return true; |
| 246 | } else { |
| 247 | // pc is not in begin/range, skip this FDE |
| 248 | } |
| 249 | } else { |
Ed Maste | 9de42aa | 2016-07-19 17:28:38 +0000 | [diff] [blame] | 250 | // Malformed CIE, now augmentation describing pc range encoding. |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 251 | } |
| 252 | } else { |
| 253 | // malformed FDE. CIE is bad |
| 254 | } |
| 255 | p = nextCFI; |
| 256 | } |
| 257 | } |
| 258 | return false; |
| 259 | } |
| 260 | |
| 261 | /// Extract info from a CIE |
| 262 | template <typename A> |
| 263 | const char *CFI_Parser<A>::parseCIE(A &addressSpace, pint_t cie, |
| 264 | CIE_Info *cieInfo) { |
| 265 | cieInfo->pointerEncoding = 0; |
| 266 | cieInfo->lsdaEncoding = DW_EH_PE_omit; |
| 267 | cieInfo->personalityEncoding = 0; |
| 268 | cieInfo->personalityOffsetInCIE = 0; |
| 269 | cieInfo->personality = 0; |
| 270 | cieInfo->codeAlignFactor = 0; |
| 271 | cieInfo->dataAlignFactor = 0; |
| 272 | cieInfo->isSignalFrame = false; |
| 273 | cieInfo->fdesHaveAugmentationData = false; |
| 274 | cieInfo->cieStart = cie; |
| 275 | pint_t p = cie; |
| 276 | pint_t cieLength = (pint_t)addressSpace.get32(p); |
| 277 | p += 4; |
| 278 | pint_t cieContentEnd = p + cieLength; |
| 279 | if (cieLength == 0xffffffff) { |
| 280 | // 0xffffffff means length is really next 8 bytes |
| 281 | cieLength = (pint_t)addressSpace.get64(p); |
| 282 | p += 8; |
| 283 | cieContentEnd = p + cieLength; |
| 284 | } |
| 285 | if (cieLength == 0) |
| 286 | return NULL; |
| 287 | // CIE ID is always 0 |
| 288 | if (addressSpace.get32(p) != 0) |
| 289 | return "CIE ID is not zero"; |
| 290 | p += 4; |
| 291 | // Version is always 1 or 3 |
| 292 | uint8_t version = addressSpace.get8(p); |
| 293 | if ((version != 1) && (version != 3)) |
| 294 | return "CIE version is not 1 or 3"; |
| 295 | ++p; |
| 296 | // save start of augmentation string and find end |
| 297 | pint_t strStart = p; |
| 298 | while (addressSpace.get8(p) != 0) |
| 299 | ++p; |
| 300 | ++p; |
| 301 | // parse code aligment factor |
| 302 | cieInfo->codeAlignFactor = (uint32_t)addressSpace.getULEB128(p, cieContentEnd); |
| 303 | // parse data alignment factor |
| 304 | cieInfo->dataAlignFactor = (int)addressSpace.getSLEB128(p, cieContentEnd); |
| 305 | // parse return address register |
| 306 | uint64_t raReg = addressSpace.getULEB128(p, cieContentEnd); |
| 307 | assert(raReg < 255 && "return address register too large"); |
| 308 | cieInfo->returnAddressRegister = (uint8_t)raReg; |
| 309 | // parse augmentation data based on augmentation string |
| 310 | const char *result = NULL; |
| 311 | if (addressSpace.get8(strStart) == 'z') { |
| 312 | // parse augmentation data length |
| 313 | addressSpace.getULEB128(p, cieContentEnd); |
| 314 | for (pint_t s = strStart; addressSpace.get8(s) != '\0'; ++s) { |
| 315 | switch (addressSpace.get8(s)) { |
| 316 | case 'z': |
| 317 | cieInfo->fdesHaveAugmentationData = true; |
| 318 | break; |
| 319 | case 'P': |
| 320 | cieInfo->personalityEncoding = addressSpace.get8(p); |
| 321 | ++p; |
| 322 | cieInfo->personalityOffsetInCIE = (uint8_t)(p - cie); |
| 323 | cieInfo->personality = addressSpace |
| 324 | .getEncodedP(p, cieContentEnd, cieInfo->personalityEncoding); |
| 325 | break; |
| 326 | case 'L': |
| 327 | cieInfo->lsdaEncoding = addressSpace.get8(p); |
| 328 | ++p; |
| 329 | break; |
| 330 | case 'R': |
| 331 | cieInfo->pointerEncoding = addressSpace.get8(p); |
| 332 | ++p; |
| 333 | break; |
| 334 | case 'S': |
| 335 | cieInfo->isSignalFrame = true; |
| 336 | break; |
| 337 | default: |
| 338 | // ignore unknown letters |
| 339 | break; |
| 340 | } |
| 341 | } |
| 342 | } |
| 343 | cieInfo->cieLength = cieContentEnd - cieInfo->cieStart; |
| 344 | cieInfo->cieInstructions = p; |
| 345 | return result; |
| 346 | } |
| 347 | |
| 348 | |
Ed Maste | 63469ff | 2016-07-19 17:15:50 +0000 | [diff] [blame] | 349 | /// "run" the DWARF instructions and create the abstact PrologInfo for an FDE |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 350 | template <typename A> |
| 351 | bool CFI_Parser<A>::parseFDEInstructions(A &addressSpace, |
| 352 | const FDE_Info &fdeInfo, |
| 353 | const CIE_Info &cieInfo, pint_t upToPC, |
| 354 | PrologInfo *results) { |
| 355 | // clear results |
| 356 | memset(results, '\0', sizeof(PrologInfo)); |
| 357 | PrologInfoStackEntry *rememberStack = NULL; |
| 358 | |
| 359 | // parse CIE then FDE instructions |
| 360 | return parseInstructions(addressSpace, cieInfo.cieInstructions, |
| 361 | cieInfo.cieStart + cieInfo.cieLength, cieInfo, |
| 362 | (pint_t)(-1), rememberStack, results) && |
| 363 | parseInstructions(addressSpace, fdeInfo.fdeInstructions, |
| 364 | fdeInfo.fdeStart + fdeInfo.fdeLength, cieInfo, |
| 365 | upToPC - fdeInfo.pcStart, rememberStack, results); |
| 366 | } |
| 367 | |
Ed Maste | 63469ff | 2016-07-19 17:15:50 +0000 | [diff] [blame] | 368 | /// "run" the DWARF instructions |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 369 | template <typename A> |
| 370 | bool CFI_Parser<A>::parseInstructions(A &addressSpace, pint_t instructions, |
| 371 | pint_t instructionsEnd, |
| 372 | const CIE_Info &cieInfo, pint_t pcoffset, |
| 373 | PrologInfoStackEntry *&rememberStack, |
| 374 | PrologInfo *results) { |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 375 | pint_t p = instructions; |
| 376 | pint_t codeOffset = 0; |
| 377 | PrologInfo initialState = *results; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 378 | |
| 379 | _LIBUNWIND_TRACE_DWARF("parseInstructions(instructions=0x%0" PRIx64 ")\n", |
| 380 | static_cast<uint64_t>(instructionsEnd)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 381 | |
Ed Maste | 63469ff | 2016-07-19 17:15:50 +0000 | [diff] [blame] | 382 | // see DWARF Spec, section 6.4.2 for details on unwind opcodes |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 383 | while ((p < instructionsEnd) && (codeOffset < pcoffset)) { |
| 384 | uint64_t reg; |
| 385 | uint64_t reg2; |
| 386 | int64_t offset; |
| 387 | uint64_t length; |
| 388 | uint8_t opcode = addressSpace.get8(p); |
| 389 | uint8_t operand; |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 390 | #if !defined(_LIBUNWIND_NO_HEAP) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 391 | PrologInfoStackEntry *entry; |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 392 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 393 | ++p; |
| 394 | switch (opcode) { |
| 395 | case DW_CFA_nop: |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 396 | _LIBUNWIND_TRACE_DWARF("DW_CFA_nop\n"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 397 | break; |
| 398 | case DW_CFA_set_loc: |
| 399 | codeOffset = |
| 400 | addressSpace.getEncodedP(p, instructionsEnd, cieInfo.pointerEncoding); |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 401 | _LIBUNWIND_TRACE_DWARF("DW_CFA_set_loc\n"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 402 | break; |
| 403 | case DW_CFA_advance_loc1: |
| 404 | codeOffset += (addressSpace.get8(p) * cieInfo.codeAlignFactor); |
| 405 | p += 1; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 406 | _LIBUNWIND_TRACE_DWARF("DW_CFA_advance_loc1: new offset=%" PRIu64 "\n", |
| 407 | static_cast<uint64_t>(codeOffset)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 408 | break; |
| 409 | case DW_CFA_advance_loc2: |
| 410 | codeOffset += (addressSpace.get16(p) * cieInfo.codeAlignFactor); |
| 411 | p += 2; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 412 | _LIBUNWIND_TRACE_DWARF("DW_CFA_advance_loc2: new offset=%" PRIu64 "\n", |
| 413 | static_cast<uint64_t>(codeOffset)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 414 | break; |
| 415 | case DW_CFA_advance_loc4: |
| 416 | codeOffset += (addressSpace.get32(p) * cieInfo.codeAlignFactor); |
| 417 | p += 4; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 418 | _LIBUNWIND_TRACE_DWARF("DW_CFA_advance_loc4: new offset=%" PRIu64 "\n", |
| 419 | static_cast<uint64_t>(codeOffset)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 420 | break; |
| 421 | case DW_CFA_offset_extended: |
| 422 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 423 | offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd) |
| 424 | * cieInfo.dataAlignFactor; |
| 425 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 426 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_offset_extended, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 427 | return false; |
| 428 | } |
| 429 | results->savedRegisters[reg].location = kRegisterInCFA; |
| 430 | results->savedRegisters[reg].value = offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 431 | _LIBUNWIND_TRACE_DWARF("DW_CFA_offset_extended(reg=%" PRIu64 ", " |
| 432 | "offset=%" PRId64 ")\n", |
| 433 | reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 434 | break; |
| 435 | case DW_CFA_restore_extended: |
| 436 | reg = addressSpace.getULEB128(p, instructionsEnd); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 437 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 438 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_restore_extended, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 439 | return false; |
| 440 | } |
| 441 | results->savedRegisters[reg] = initialState.savedRegisters[reg]; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 442 | _LIBUNWIND_TRACE_DWARF("DW_CFA_restore_extended(reg=%" PRIu64 ")\n", reg); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 443 | break; |
| 444 | case DW_CFA_undefined: |
| 445 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 446 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 447 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_undefined, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 448 | return false; |
| 449 | } |
| 450 | results->savedRegisters[reg].location = kRegisterUnused; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 451 | _LIBUNWIND_TRACE_DWARF("DW_CFA_undefined(reg=%" PRIu64 ")\n", reg); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 452 | break; |
| 453 | case DW_CFA_same_value: |
| 454 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 455 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 456 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_same_value, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 457 | return false; |
| 458 | } |
| 459 | // <rdar://problem/8456377> DW_CFA_same_value unsupported |
| 460 | // "same value" means register was stored in frame, but its current |
| 461 | // value has not changed, so no need to restore from frame. |
| 462 | // We model this as if the register was never saved. |
| 463 | results->savedRegisters[reg].location = kRegisterUnused; |
| 464 | // set flag to disable conversion to compact unwind |
| 465 | results->sameValueUsed = true; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 466 | _LIBUNWIND_TRACE_DWARF("DW_CFA_same_value(reg=%" PRIu64 ")\n", reg); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 467 | break; |
| 468 | case DW_CFA_register: |
| 469 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 470 | reg2 = addressSpace.getULEB128(p, instructionsEnd); |
| 471 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 472 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_register, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 473 | return false; |
| 474 | } |
| 475 | if (reg2 > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 476 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_register, reg2 too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 477 | return false; |
| 478 | } |
| 479 | results->savedRegisters[reg].location = kRegisterInRegister; |
| 480 | results->savedRegisters[reg].value = (int64_t)reg2; |
| 481 | // set flag to disable conversion to compact unwind |
| 482 | results->registersInOtherRegisters = true; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 483 | _LIBUNWIND_TRACE_DWARF( |
| 484 | "DW_CFA_register(reg=%" PRIu64 ", reg2=%" PRIu64 ")\n", reg, reg2); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 485 | break; |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 486 | #if !defined(_LIBUNWIND_NO_HEAP) |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 487 | case DW_CFA_remember_state: |
| 488 | // avoid operator new, because that would be an upward dependency |
| 489 | entry = (PrologInfoStackEntry *)malloc(sizeof(PrologInfoStackEntry)); |
| 490 | if (entry != NULL) { |
| 491 | entry->next = rememberStack; |
| 492 | entry->info = *results; |
| 493 | rememberStack = entry; |
| 494 | } else { |
| 495 | return false; |
| 496 | } |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 497 | _LIBUNWIND_TRACE_DWARF("DW_CFA_remember_state\n"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 498 | break; |
| 499 | case DW_CFA_restore_state: |
| 500 | if (rememberStack != NULL) { |
| 501 | PrologInfoStackEntry *top = rememberStack; |
| 502 | *results = top->info; |
| 503 | rememberStack = top->next; |
| 504 | free((char *)top); |
| 505 | } else { |
| 506 | return false; |
| 507 | } |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 508 | _LIBUNWIND_TRACE_DWARF("DW_CFA_restore_state\n"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 509 | break; |
Peter Zotov | 543f848 | 2015-11-09 06:57:29 +0000 | [diff] [blame] | 510 | #endif |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 511 | case DW_CFA_def_cfa: |
| 512 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 513 | offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd); |
| 514 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 515 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_def_cfa, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 516 | return false; |
| 517 | } |
| 518 | results->cfaRegister = (uint32_t)reg; |
| 519 | results->cfaRegisterOffset = (int32_t)offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 520 | _LIBUNWIND_TRACE_DWARF( |
| 521 | "DW_CFA_def_cfa(reg=%" PRIu64 ", offset=%" PRIu64 ")\n", reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 522 | break; |
| 523 | case DW_CFA_def_cfa_register: |
| 524 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 525 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 526 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_def_cfa_register, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 527 | return false; |
| 528 | } |
| 529 | results->cfaRegister = (uint32_t)reg; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 530 | _LIBUNWIND_TRACE_DWARF("DW_CFA_def_cfa_register(%" PRIu64 ")\n", reg); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 531 | break; |
| 532 | case DW_CFA_def_cfa_offset: |
| 533 | results->cfaRegisterOffset = (int32_t) |
| 534 | addressSpace.getULEB128(p, instructionsEnd); |
| 535 | results->codeOffsetAtStackDecrement = (uint32_t)codeOffset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 536 | _LIBUNWIND_TRACE_DWARF("DW_CFA_def_cfa_offset(%d)\n", |
| 537 | results->cfaRegisterOffset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 538 | break; |
| 539 | case DW_CFA_def_cfa_expression: |
| 540 | results->cfaRegister = 0; |
| 541 | results->cfaExpression = (int64_t)p; |
| 542 | length = addressSpace.getULEB128(p, instructionsEnd); |
| 543 | p += length; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 544 | _LIBUNWIND_TRACE_DWARF("DW_CFA_def_cfa_expression(expression=0x%" PRIx64 |
| 545 | ", length=%" PRIu64 ")\n", |
| 546 | results->cfaExpression, length); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 547 | break; |
| 548 | case DW_CFA_expression: |
| 549 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 550 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 551 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_expression, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 552 | return false; |
| 553 | } |
| 554 | results->savedRegisters[reg].location = kRegisterAtExpression; |
| 555 | results->savedRegisters[reg].value = (int64_t)p; |
| 556 | length = addressSpace.getULEB128(p, instructionsEnd); |
| 557 | p += length; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 558 | _LIBUNWIND_TRACE_DWARF("DW_CFA_expression(reg=%" PRIu64 ", " |
| 559 | "expression=0x%" PRIx64 ", " |
| 560 | "length=%" PRIu64 ")\n", |
| 561 | reg, results->savedRegisters[reg].value, length); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 562 | break; |
| 563 | case DW_CFA_offset_extended_sf: |
| 564 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 565 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 566 | _LIBUNWIND_LOG( |
| 567 | "malformed DWARF DW_CFA_offset_extended_sf, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 568 | return false; |
| 569 | } |
| 570 | offset = |
| 571 | addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor; |
| 572 | results->savedRegisters[reg].location = kRegisterInCFA; |
| 573 | results->savedRegisters[reg].value = offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 574 | _LIBUNWIND_TRACE_DWARF("DW_CFA_offset_extended_sf(reg=%" PRIu64 ", " |
| 575 | "offset=%" PRId64 ")\n", |
| 576 | reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 577 | break; |
| 578 | case DW_CFA_def_cfa_sf: |
| 579 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 580 | offset = |
| 581 | addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor; |
| 582 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 583 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_def_cfa_sf, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 584 | return false; |
| 585 | } |
| 586 | results->cfaRegister = (uint32_t)reg; |
| 587 | results->cfaRegisterOffset = (int32_t)offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 588 | _LIBUNWIND_TRACE_DWARF("DW_CFA_def_cfa_sf(reg=%" PRIu64 ", " |
| 589 | "offset=%" PRId64 ")\n", |
| 590 | reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 591 | break; |
| 592 | case DW_CFA_def_cfa_offset_sf: |
| 593 | results->cfaRegisterOffset = (int32_t) |
| 594 | (addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor); |
| 595 | results->codeOffsetAtStackDecrement = (uint32_t)codeOffset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 596 | _LIBUNWIND_TRACE_DWARF("DW_CFA_def_cfa_offset_sf(%d)\n", |
| 597 | results->cfaRegisterOffset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 598 | break; |
| 599 | case DW_CFA_val_offset: |
| 600 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 601 | offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd) |
| 602 | * cieInfo.dataAlignFactor; |
| 603 | results->savedRegisters[reg].location = kRegisterOffsetFromCFA; |
| 604 | results->savedRegisters[reg].value = offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 605 | _LIBUNWIND_TRACE_DWARF("DW_CFA_val_offset(reg=%" PRIu64 ", " |
| 606 | "offset=%" PRId64 "\n", |
| 607 | reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 608 | break; |
| 609 | case DW_CFA_val_offset_sf: |
| 610 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 611 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 612 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_val_offset_sf, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 613 | return false; |
| 614 | } |
| 615 | offset = |
| 616 | addressSpace.getSLEB128(p, instructionsEnd) * cieInfo.dataAlignFactor; |
| 617 | results->savedRegisters[reg].location = kRegisterOffsetFromCFA; |
| 618 | results->savedRegisters[reg].value = offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 619 | _LIBUNWIND_TRACE_DWARF("DW_CFA_val_offset_sf(reg=%" PRIu64 ", " |
| 620 | "offset=%" PRId64 "\n", |
| 621 | reg, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 622 | break; |
| 623 | case DW_CFA_val_expression: |
| 624 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 625 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 626 | _LIBUNWIND_LOG("malformed DWARF DW_CFA_val_expression, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 627 | return false; |
| 628 | } |
| 629 | results->savedRegisters[reg].location = kRegisterIsExpression; |
| 630 | results->savedRegisters[reg].value = (int64_t)p; |
| 631 | length = addressSpace.getULEB128(p, instructionsEnd); |
| 632 | p += length; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 633 | _LIBUNWIND_TRACE_DWARF("DW_CFA_val_expression(reg=%" PRIu64 ", " |
| 634 | "expression=0x%" PRIx64 ", length=%" PRIu64 ")\n", |
| 635 | reg, results->savedRegisters[reg].value, length); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 636 | break; |
| 637 | case DW_CFA_GNU_args_size: |
| 638 | length = addressSpace.getULEB128(p, instructionsEnd); |
| 639 | results->spExtraArgSize = (uint32_t)length; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 640 | _LIBUNWIND_TRACE_DWARF("DW_CFA_GNU_args_size(%" PRIu64 ")\n", length); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 641 | break; |
| 642 | case DW_CFA_GNU_negative_offset_extended: |
| 643 | reg = addressSpace.getULEB128(p, instructionsEnd); |
| 644 | if (reg > kMaxRegisterNumber) { |
Saleem Abdulrasool | d8c14f5 | 2017-01-21 16:22:55 +0000 | [diff] [blame] | 645 | _LIBUNWIND_LOG( |
| 646 | "malformed DWARF DW_CFA_GNU_negative_offset_extended, reg too big"); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 647 | return false; |
| 648 | } |
| 649 | offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd) |
| 650 | * cieInfo.dataAlignFactor; |
| 651 | results->savedRegisters[reg].location = kRegisterInCFA; |
| 652 | results->savedRegisters[reg].value = -offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 653 | _LIBUNWIND_TRACE_DWARF( |
| 654 | "DW_CFA_GNU_negative_offset_extended(%" PRId64 ")\n", offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 655 | break; |
| 656 | default: |
| 657 | operand = opcode & 0x3F; |
| 658 | switch (opcode & 0xC0) { |
| 659 | case DW_CFA_offset: |
| 660 | reg = operand; |
| 661 | offset = (int64_t)addressSpace.getULEB128(p, instructionsEnd) |
| 662 | * cieInfo.dataAlignFactor; |
| 663 | results->savedRegisters[reg].location = kRegisterInCFA; |
| 664 | results->savedRegisters[reg].value = offset; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 665 | _LIBUNWIND_TRACE_DWARF("DW_CFA_offset(reg=%d, offset=%" PRId64 ")\n", |
| 666 | operand, offset); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 667 | break; |
| 668 | case DW_CFA_advance_loc: |
| 669 | codeOffset += operand * cieInfo.codeAlignFactor; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 670 | _LIBUNWIND_TRACE_DWARF("DW_CFA_advance_loc: new offset=%" PRIu64 "\n", |
| 671 | static_cast<uint64_t>(codeOffset)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 672 | break; |
| 673 | case DW_CFA_restore: |
| 674 | reg = operand; |
| 675 | results->savedRegisters[reg] = initialState.savedRegisters[reg]; |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 676 | _LIBUNWIND_TRACE_DWARF("DW_CFA_restore(reg=%" PRIu64 ")\n", |
Saleem Abdulrasool | 43a1c58 | 2017-01-21 21:27:29 +0000 | [diff] [blame^] | 677 | static_cast<uint64_t>(operand)); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 678 | break; |
| 679 | default: |
Saleem Abdulrasool | e1d4b2e | 2017-01-21 16:22:57 +0000 | [diff] [blame] | 680 | _LIBUNWIND_TRACE_DWARF("unknown CFA opcode 0x%02X\n", opcode); |
Saleem Abdulrasool | 675df58 | 2015-04-24 19:39:17 +0000 | [diff] [blame] | 681 | return false; |
| 682 | } |
| 683 | } |
| 684 | } |
| 685 | |
| 686 | return true; |
| 687 | } |
| 688 | |
| 689 | } // namespace libunwind |
| 690 | |
| 691 | #endif // __DWARF_PARSER_HPP__ |