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| 1 //===-------------------------- CompactUnwinder.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 // Does runtime stack unwinding using compact unwind encodings. |
| 10 // |
| 11 //===----------------------------------------------------------------------===// |
| 12 |
| 13 #ifndef __COMPACT_UNWINDER_HPP__ |
| 14 #define __COMPACT_UNWINDER_HPP__ |
| 15 |
| 16 #include <stdint.h> |
| 17 #include <stdlib.h> |
| 18 |
| 19 #include <libunwind.h> |
| 20 #include <mach-o/compact_unwind_encoding.h> |
| 21 |
| 22 #include "AddressSpace.hpp" |
| 23 #include "Registers.hpp" |
| 24 |
| 25 #define EXTRACT_BITS(value, mask) \ |
| 26 ((value >> __builtin_ctz(mask)) & (((1 << __builtin_popcount(mask))) - 1)) |
| 27 |
| 28 namespace libunwind { |
| 29 |
| 30 /// CompactUnwinder_x86 uses a compact unwind info to virtually "step" (aka |
| 31 /// unwind) by modifying a Registers_x86 register set |
| 32 template <typename A> |
| 33 class CompactUnwinder_x86 { |
| 34 public: |
| 35 |
| 36 static int stepWithCompactEncoding(compact_unwind_encoding_t info, |
| 37 uint32_t functionStart, A &addressSpace, |
| 38 Registers_x86 ®isters); |
| 39 |
| 40 private: |
| 41 typename A::pint_t pint_t; |
| 42 |
| 43 static void frameUnwind(A &addressSpace, Registers_x86 ®isters); |
| 44 static void framelessUnwind(A &addressSpace, |
| 45 typename A::pint_t returnAddressLocation, |
| 46 Registers_x86 ®isters); |
| 47 static int |
| 48 stepWithCompactEncodingEBPFrame(compact_unwind_encoding_t compactEncoding, |
| 49 uint32_t functionStart, A &addressSpace, |
| 50 Registers_x86 ®isters); |
| 51 static int stepWithCompactEncodingFrameless( |
| 52 compact_unwind_encoding_t compactEncoding, uint32_t functionStart, |
| 53 A &addressSpace, Registers_x86 ®isters, bool indirectStackSize); |
| 54 }; |
| 55 |
| 56 template <typename A> |
| 57 int CompactUnwinder_x86<A>::stepWithCompactEncoding( |
| 58 compact_unwind_encoding_t compactEncoding, uint32_t functionStart, |
| 59 A &addressSpace, Registers_x86 ®isters) { |
| 60 switch (compactEncoding & UNWIND_X86_MODE_MASK) { |
| 61 case UNWIND_X86_MODE_EBP_FRAME: |
| 62 return stepWithCompactEncodingEBPFrame(compactEncoding, functionStart, |
| 63 addressSpace, registers); |
| 64 case UNWIND_X86_MODE_STACK_IMMD: |
| 65 return stepWithCompactEncodingFrameless(compactEncoding, functionStart, |
| 66 addressSpace, registers, false); |
| 67 case UNWIND_X86_MODE_STACK_IND: |
| 68 return stepWithCompactEncodingFrameless(compactEncoding, functionStart, |
| 69 addressSpace, registers, true); |
| 70 } |
| 71 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 72 } |
| 73 |
| 74 template <typename A> |
| 75 int CompactUnwinder_x86<A>::stepWithCompactEncodingEBPFrame( |
| 76 compact_unwind_encoding_t compactEncoding, uint32_t functionStart, |
| 77 A &addressSpace, Registers_x86 ®isters) { |
| 78 uint32_t savedRegistersOffset = |
| 79 EXTRACT_BITS(compactEncoding, UNWIND_X86_EBP_FRAME_OFFSET); |
| 80 uint32_t savedRegistersLocations = |
| 81 EXTRACT_BITS(compactEncoding, UNWIND_X86_EBP_FRAME_REGISTERS); |
| 82 |
| 83 uint32_t savedRegisters = registers.getEBP() - 4 * savedRegistersOffset; |
| 84 for (int i = 0; i < 5; ++i) { |
| 85 switch (savedRegistersLocations & 0x7) { |
| 86 case UNWIND_X86_REG_NONE: |
| 87 // no register saved in this slot |
| 88 break; |
| 89 case UNWIND_X86_REG_EBX: |
| 90 registers.setEBX(addressSpace.get32(savedRegisters)); |
| 91 break; |
| 92 case UNWIND_X86_REG_ECX: |
| 93 registers.setECX(addressSpace.get32(savedRegisters)); |
| 94 break; |
| 95 case UNWIND_X86_REG_EDX: |
| 96 registers.setEDX(addressSpace.get32(savedRegisters)); |
| 97 break; |
| 98 case UNWIND_X86_REG_EDI: |
| 99 registers.setEDI(addressSpace.get32(savedRegisters)); |
| 100 break; |
| 101 case UNWIND_X86_REG_ESI: |
| 102 registers.setESI(addressSpace.get32(savedRegisters)); |
| 103 break; |
| 104 default: |
| 105 (void)functionStart; |
| 106 _LIBUNWIND_DEBUG_LOG("bad register for EBP frame, encoding=%08X for " |
| 107 "function starting at 0x%X\n", |
| 108 compactEncoding, functionStart); |
| 109 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 110 } |
| 111 savedRegisters += 4; |
| 112 savedRegistersLocations = (savedRegistersLocations >> 3); |
| 113 } |
| 114 frameUnwind(addressSpace, registers); |
| 115 return UNW_STEP_SUCCESS; |
| 116 } |
| 117 |
| 118 template <typename A> |
| 119 int CompactUnwinder_x86<A>::stepWithCompactEncodingFrameless( |
| 120 compact_unwind_encoding_t encoding, uint32_t functionStart, |
| 121 A &addressSpace, Registers_x86 ®isters, bool indirectStackSize) { |
| 122 uint32_t stackSizeEncoded = |
| 123 EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_SIZE); |
| 124 uint32_t stackAdjust = |
| 125 EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_ADJUST); |
| 126 uint32_t regCount = |
| 127 EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_COUNT); |
| 128 uint32_t permutation = |
| 129 EXTRACT_BITS(encoding, UNWIND_X86_FRAMELESS_STACK_REG_PERMUTATION); |
| 130 uint32_t stackSize = stackSizeEncoded * 4; |
| 131 if (indirectStackSize) { |
| 132 // stack size is encoded in subl $xxx,%esp instruction |
| 133 uint32_t subl = addressSpace.get32(functionStart + stackSizeEncoded); |
| 134 stackSize = subl + 4 * stackAdjust; |
| 135 } |
| 136 // decompress permutation |
| 137 uint32_t permunreg[6]; |
| 138 switch (regCount) { |
| 139 case 6: |
| 140 permunreg[0] = permutation / 120; |
| 141 permutation -= (permunreg[0] * 120); |
| 142 permunreg[1] = permutation / 24; |
| 143 permutation -= (permunreg[1] * 24); |
| 144 permunreg[2] = permutation / 6; |
| 145 permutation -= (permunreg[2] * 6); |
| 146 permunreg[3] = permutation / 2; |
| 147 permutation -= (permunreg[3] * 2); |
| 148 permunreg[4] = permutation; |
| 149 permunreg[5] = 0; |
| 150 break; |
| 151 case 5: |
| 152 permunreg[0] = permutation / 120; |
| 153 permutation -= (permunreg[0] * 120); |
| 154 permunreg[1] = permutation / 24; |
| 155 permutation -= (permunreg[1] * 24); |
| 156 permunreg[2] = permutation / 6; |
| 157 permutation -= (permunreg[2] * 6); |
| 158 permunreg[3] = permutation / 2; |
| 159 permutation -= (permunreg[3] * 2); |
| 160 permunreg[4] = permutation; |
| 161 break; |
| 162 case 4: |
| 163 permunreg[0] = permutation / 60; |
| 164 permutation -= (permunreg[0] * 60); |
| 165 permunreg[1] = permutation / 12; |
| 166 permutation -= (permunreg[1] * 12); |
| 167 permunreg[2] = permutation / 3; |
| 168 permutation -= (permunreg[2] * 3); |
| 169 permunreg[3] = permutation; |
| 170 break; |
| 171 case 3: |
| 172 permunreg[0] = permutation / 20; |
| 173 permutation -= (permunreg[0] * 20); |
| 174 permunreg[1] = permutation / 4; |
| 175 permutation -= (permunreg[1] * 4); |
| 176 permunreg[2] = permutation; |
| 177 break; |
| 178 case 2: |
| 179 permunreg[0] = permutation / 5; |
| 180 permutation -= (permunreg[0] * 5); |
| 181 permunreg[1] = permutation; |
| 182 break; |
| 183 case 1: |
| 184 permunreg[0] = permutation; |
| 185 break; |
| 186 } |
| 187 // re-number registers back to standard numbers |
| 188 int registersSaved[6]; |
| 189 bool used[7] = { false, false, false, false, false, false, false }; |
| 190 for (uint32_t i = 0; i < regCount; ++i) { |
| 191 uint32_t renum = 0; |
| 192 for (int u = 1; u < 7; ++u) { |
| 193 if (!used[u]) { |
| 194 if (renum == permunreg[i]) { |
| 195 registersSaved[i] = u; |
| 196 used[u] = true; |
| 197 break; |
| 198 } |
| 199 ++renum; |
| 200 } |
| 201 } |
| 202 } |
| 203 uint32_t savedRegisters = registers.getSP() + stackSize - 4 - 4 * regCount; |
| 204 for (uint32_t i = 0; i < regCount; ++i) { |
| 205 switch (registersSaved[i]) { |
| 206 case UNWIND_X86_REG_EBX: |
| 207 registers.setEBX(addressSpace.get32(savedRegisters)); |
| 208 break; |
| 209 case UNWIND_X86_REG_ECX: |
| 210 registers.setECX(addressSpace.get32(savedRegisters)); |
| 211 break; |
| 212 case UNWIND_X86_REG_EDX: |
| 213 registers.setEDX(addressSpace.get32(savedRegisters)); |
| 214 break; |
| 215 case UNWIND_X86_REG_EDI: |
| 216 registers.setEDI(addressSpace.get32(savedRegisters)); |
| 217 break; |
| 218 case UNWIND_X86_REG_ESI: |
| 219 registers.setESI(addressSpace.get32(savedRegisters)); |
| 220 break; |
| 221 case UNWIND_X86_REG_EBP: |
| 222 registers.setEBP(addressSpace.get32(savedRegisters)); |
| 223 break; |
| 224 default: |
| 225 _LIBUNWIND_DEBUG_LOG("bad register for frameless, encoding=%08X for " |
| 226 "function starting at 0x%X\n", |
| 227 encoding, functionStart); |
| 228 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 229 } |
| 230 savedRegisters += 4; |
| 231 } |
| 232 framelessUnwind(addressSpace, savedRegisters, registers); |
| 233 return UNW_STEP_SUCCESS; |
| 234 } |
| 235 |
| 236 |
| 237 template <typename A> |
| 238 void CompactUnwinder_x86<A>::frameUnwind(A &addressSpace, |
| 239 Registers_x86 ®isters) { |
| 240 typename A::pint_t bp = registers.getEBP(); |
| 241 // ebp points to old ebp |
| 242 registers.setEBP(addressSpace.get32(bp)); |
| 243 // old esp is ebp less saved ebp and return address |
| 244 registers.setSP((uint32_t)bp + 8); |
| 245 // pop return address into eip |
| 246 registers.setIP(addressSpace.get32(bp + 4)); |
| 247 } |
| 248 |
| 249 template <typename A> |
| 250 void CompactUnwinder_x86<A>::framelessUnwind( |
| 251 A &addressSpace, typename A::pint_t returnAddressLocation, |
| 252 Registers_x86 ®isters) { |
| 253 // return address is on stack after last saved register |
| 254 registers.setIP(addressSpace.get32(returnAddressLocation)); |
| 255 // old esp is before return address |
| 256 registers.setSP((uint32_t)returnAddressLocation + 4); |
| 257 } |
| 258 |
| 259 |
| 260 /// CompactUnwinder_x86_64 uses a compact unwind info to virtually "step" (aka |
| 261 /// unwind) by modifying a Registers_x86_64 register set |
| 262 template <typename A> |
| 263 class CompactUnwinder_x86_64 { |
| 264 public: |
| 265 |
| 266 static int stepWithCompactEncoding(compact_unwind_encoding_t compactEncoding, |
| 267 uint64_t functionStart, A &addressSpace, |
| 268 Registers_x86_64 ®isters); |
| 269 |
| 270 private: |
| 271 typename A::pint_t pint_t; |
| 272 |
| 273 static void frameUnwind(A &addressSpace, Registers_x86_64 ®isters); |
| 274 static void framelessUnwind(A &addressSpace, uint64_t returnAddressLocation, |
| 275 Registers_x86_64 ®isters); |
| 276 static int |
| 277 stepWithCompactEncodingRBPFrame(compact_unwind_encoding_t compactEncoding, |
| 278 uint64_t functionStart, A &addressSpace, |
| 279 Registers_x86_64 ®isters); |
| 280 static int stepWithCompactEncodingFrameless( |
| 281 compact_unwind_encoding_t compactEncoding, uint64_t functionStart, |
| 282 A &addressSpace, Registers_x86_64 ®isters, bool indirectStackSize); |
| 283 }; |
| 284 |
| 285 template <typename A> |
| 286 int CompactUnwinder_x86_64<A>::stepWithCompactEncoding( |
| 287 compact_unwind_encoding_t compactEncoding, uint64_t functionStart, |
| 288 A &addressSpace, Registers_x86_64 ®isters) { |
| 289 switch (compactEncoding & UNWIND_X86_64_MODE_MASK) { |
| 290 case UNWIND_X86_64_MODE_RBP_FRAME: |
| 291 return stepWithCompactEncodingRBPFrame(compactEncoding, functionStart, |
| 292 addressSpace, registers); |
| 293 case UNWIND_X86_64_MODE_STACK_IMMD: |
| 294 return stepWithCompactEncodingFrameless(compactEncoding, functionStart, |
| 295 addressSpace, registers, false); |
| 296 case UNWIND_X86_64_MODE_STACK_IND: |
| 297 return stepWithCompactEncodingFrameless(compactEncoding, functionStart, |
| 298 addressSpace, registers, true); |
| 299 } |
| 300 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 301 } |
| 302 |
| 303 template <typename A> |
| 304 int CompactUnwinder_x86_64<A>::stepWithCompactEncodingRBPFrame( |
| 305 compact_unwind_encoding_t compactEncoding, uint64_t functionStart, |
| 306 A &addressSpace, Registers_x86_64 ®isters) { |
| 307 uint32_t savedRegistersOffset = |
| 308 EXTRACT_BITS(compactEncoding, UNWIND_X86_64_RBP_FRAME_OFFSET); |
| 309 uint32_t savedRegistersLocations = |
| 310 EXTRACT_BITS(compactEncoding, UNWIND_X86_64_RBP_FRAME_REGISTERS); |
| 311 |
| 312 uint64_t savedRegisters = registers.getRBP() - 8 * savedRegistersOffset; |
| 313 for (int i = 0; i < 5; ++i) { |
| 314 switch (savedRegistersLocations & 0x7) { |
| 315 case UNWIND_X86_64_REG_NONE: |
| 316 // no register saved in this slot |
| 317 break; |
| 318 case UNWIND_X86_64_REG_RBX: |
| 319 registers.setRBX(addressSpace.get64(savedRegisters)); |
| 320 break; |
| 321 case UNWIND_X86_64_REG_R12: |
| 322 registers.setR12(addressSpace.get64(savedRegisters)); |
| 323 break; |
| 324 case UNWIND_X86_64_REG_R13: |
| 325 registers.setR13(addressSpace.get64(savedRegisters)); |
| 326 break; |
| 327 case UNWIND_X86_64_REG_R14: |
| 328 registers.setR14(addressSpace.get64(savedRegisters)); |
| 329 break; |
| 330 case UNWIND_X86_64_REG_R15: |
| 331 registers.setR15(addressSpace.get64(savedRegisters)); |
| 332 break; |
| 333 default: |
| 334 (void)functionStart; |
| 335 _LIBUNWIND_DEBUG_LOG("bad register for RBP frame, encoding=%08X for " |
| 336 "function starting at 0x%llX\n", |
| 337 compactEncoding, functionStart); |
| 338 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 339 } |
| 340 savedRegisters += 8; |
| 341 savedRegistersLocations = (savedRegistersLocations >> 3); |
| 342 } |
| 343 frameUnwind(addressSpace, registers); |
| 344 return UNW_STEP_SUCCESS; |
| 345 } |
| 346 |
| 347 template <typename A> |
| 348 int CompactUnwinder_x86_64<A>::stepWithCompactEncodingFrameless( |
| 349 compact_unwind_encoding_t encoding, uint64_t functionStart, A &addressSpace, |
| 350 Registers_x86_64 ®isters, bool indirectStackSize) { |
| 351 uint32_t stackSizeEncoded = |
| 352 EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_SIZE); |
| 353 uint32_t stackAdjust = |
| 354 EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_ADJUST); |
| 355 uint32_t regCount = |
| 356 EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_COUNT); |
| 357 uint32_t permutation = |
| 358 EXTRACT_BITS(encoding, UNWIND_X86_64_FRAMELESS_STACK_REG_PERMUTATION); |
| 359 uint32_t stackSize = stackSizeEncoded * 8; |
| 360 if (indirectStackSize) { |
| 361 // stack size is encoded in subl $xxx,%esp instruction |
| 362 uint32_t subl = addressSpace.get32(functionStart + stackSizeEncoded); |
| 363 stackSize = subl + 8 * stackAdjust; |
| 364 } |
| 365 // decompress permutation |
| 366 uint32_t permunreg[6]; |
| 367 switch (regCount) { |
| 368 case 6: |
| 369 permunreg[0] = permutation / 120; |
| 370 permutation -= (permunreg[0] * 120); |
| 371 permunreg[1] = permutation / 24; |
| 372 permutation -= (permunreg[1] * 24); |
| 373 permunreg[2] = permutation / 6; |
| 374 permutation -= (permunreg[2] * 6); |
| 375 permunreg[3] = permutation / 2; |
| 376 permutation -= (permunreg[3] * 2); |
| 377 permunreg[4] = permutation; |
| 378 permunreg[5] = 0; |
| 379 break; |
| 380 case 5: |
| 381 permunreg[0] = permutation / 120; |
| 382 permutation -= (permunreg[0] * 120); |
| 383 permunreg[1] = permutation / 24; |
| 384 permutation -= (permunreg[1] * 24); |
| 385 permunreg[2] = permutation / 6; |
| 386 permutation -= (permunreg[2] * 6); |
| 387 permunreg[3] = permutation / 2; |
| 388 permutation -= (permunreg[3] * 2); |
| 389 permunreg[4] = permutation; |
| 390 break; |
| 391 case 4: |
| 392 permunreg[0] = permutation / 60; |
| 393 permutation -= (permunreg[0] * 60); |
| 394 permunreg[1] = permutation / 12; |
| 395 permutation -= (permunreg[1] * 12); |
| 396 permunreg[2] = permutation / 3; |
| 397 permutation -= (permunreg[2] * 3); |
| 398 permunreg[3] = permutation; |
| 399 break; |
| 400 case 3: |
| 401 permunreg[0] = permutation / 20; |
| 402 permutation -= (permunreg[0] * 20); |
| 403 permunreg[1] = permutation / 4; |
| 404 permutation -= (permunreg[1] * 4); |
| 405 permunreg[2] = permutation; |
| 406 break; |
| 407 case 2: |
| 408 permunreg[0] = permutation / 5; |
| 409 permutation -= (permunreg[0] * 5); |
| 410 permunreg[1] = permutation; |
| 411 break; |
| 412 case 1: |
| 413 permunreg[0] = permutation; |
| 414 break; |
| 415 } |
| 416 // re-number registers back to standard numbers |
| 417 int registersSaved[6]; |
| 418 bool used[7] = { false, false, false, false, false, false, false }; |
| 419 for (uint32_t i = 0; i < regCount; ++i) { |
| 420 uint32_t renum = 0; |
| 421 for (int u = 1; u < 7; ++u) { |
| 422 if (!used[u]) { |
| 423 if (renum == permunreg[i]) { |
| 424 registersSaved[i] = u; |
| 425 used[u] = true; |
| 426 break; |
| 427 } |
| 428 ++renum; |
| 429 } |
| 430 } |
| 431 } |
| 432 uint64_t savedRegisters = registers.getSP() + stackSize - 8 - 8 * regCount; |
| 433 for (uint32_t i = 0; i < regCount; ++i) { |
| 434 switch (registersSaved[i]) { |
| 435 case UNWIND_X86_64_REG_RBX: |
| 436 registers.setRBX(addressSpace.get64(savedRegisters)); |
| 437 break; |
| 438 case UNWIND_X86_64_REG_R12: |
| 439 registers.setR12(addressSpace.get64(savedRegisters)); |
| 440 break; |
| 441 case UNWIND_X86_64_REG_R13: |
| 442 registers.setR13(addressSpace.get64(savedRegisters)); |
| 443 break; |
| 444 case UNWIND_X86_64_REG_R14: |
| 445 registers.setR14(addressSpace.get64(savedRegisters)); |
| 446 break; |
| 447 case UNWIND_X86_64_REG_R15: |
| 448 registers.setR15(addressSpace.get64(savedRegisters)); |
| 449 break; |
| 450 case UNWIND_X86_64_REG_RBP: |
| 451 registers.setRBP(addressSpace.get64(savedRegisters)); |
| 452 break; |
| 453 default: |
| 454 _LIBUNWIND_DEBUG_LOG("bad register for frameless, encoding=%08X for " |
| 455 "function starting at 0x%llX\n", |
| 456 encoding, functionStart); |
| 457 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 458 } |
| 459 savedRegisters += 8; |
| 460 } |
| 461 framelessUnwind(addressSpace, savedRegisters, registers); |
| 462 return UNW_STEP_SUCCESS; |
| 463 } |
| 464 |
| 465 |
| 466 template <typename A> |
| 467 void CompactUnwinder_x86_64<A>::frameUnwind(A &addressSpace, |
| 468 Registers_x86_64 ®isters) { |
| 469 uint64_t rbp = registers.getRBP(); |
| 470 // ebp points to old ebp |
| 471 registers.setRBP(addressSpace.get64(rbp)); |
| 472 // old esp is ebp less saved ebp and return address |
| 473 registers.setSP(rbp + 16); |
| 474 // pop return address into eip |
| 475 registers.setIP(addressSpace.get64(rbp + 8)); |
| 476 } |
| 477 |
| 478 template <typename A> |
| 479 void CompactUnwinder_x86_64<A>::framelessUnwind(A &addressSpace, |
| 480 uint64_t returnAddressLocation, |
| 481 Registers_x86_64 ®isters) { |
| 482 // return address is on stack after last saved register |
| 483 registers.setIP(addressSpace.get64(returnAddressLocation)); |
| 484 // old esp is before return address |
| 485 registers.setSP(returnAddressLocation + 8); |
| 486 } |
| 487 |
| 488 |
| 489 |
| 490 /// CompactUnwinder_arm64 uses a compact unwind info to virtually "step" (aka |
| 491 /// unwind) by modifying a Registers_arm64 register set |
| 492 template <typename A> |
| 493 class CompactUnwinder_arm64 { |
| 494 public: |
| 495 |
| 496 static int stepWithCompactEncoding(compact_unwind_encoding_t compactEncoding, |
| 497 uint64_t functionStart, A &addressSpace, |
| 498 Registers_arm64 ®isters); |
| 499 |
| 500 private: |
| 501 typename A::pint_t pint_t; |
| 502 |
| 503 static int |
| 504 stepWithCompactEncodingFrame(compact_unwind_encoding_t compactEncoding, |
| 505 uint64_t functionStart, A &addressSpace, |
| 506 Registers_arm64 ®isters); |
| 507 static int stepWithCompactEncodingFrameless( |
| 508 compact_unwind_encoding_t compactEncoding, uint64_t functionStart, |
| 509 A &addressSpace, Registers_arm64 ®isters); |
| 510 }; |
| 511 |
| 512 template <typename A> |
| 513 int CompactUnwinder_arm64<A>::stepWithCompactEncoding( |
| 514 compact_unwind_encoding_t compactEncoding, uint64_t functionStart, |
| 515 A &addressSpace, Registers_arm64 ®isters) { |
| 516 switch (compactEncoding & UNWIND_ARM64_MODE_MASK) { |
| 517 case UNWIND_ARM64_MODE_FRAME: |
| 518 return stepWithCompactEncodingFrame(compactEncoding, functionStart, |
| 519 addressSpace, registers); |
| 520 case UNWIND_ARM64_MODE_FRAMELESS: |
| 521 return stepWithCompactEncodingFrameless(compactEncoding, functionStart, |
| 522 addressSpace, registers); |
| 523 } |
| 524 _LIBUNWIND_ABORT("invalid compact unwind encoding"); |
| 525 } |
| 526 |
| 527 template <typename A> |
| 528 int CompactUnwinder_arm64<A>::stepWithCompactEncodingFrameless( |
| 529 compact_unwind_encoding_t encoding, uint64_t, A &addressSpace, |
| 530 Registers_arm64 ®isters) { |
| 531 uint32_t stackSize = |
| 532 16 * EXTRACT_BITS(encoding, UNWIND_ARM64_FRAMELESS_STACK_SIZE_MASK); |
| 533 |
| 534 uint64_t savedRegisterLoc = registers.getSP() + stackSize; |
| 535 |
| 536 if (encoding & UNWIND_ARM64_FRAME_X19_X20_PAIR) { |
| 537 registers.setRegister(UNW_ARM64_X19, addressSpace.get64(savedRegisterLoc)); |
| 538 savedRegisterLoc -= 8; |
| 539 registers.setRegister(UNW_ARM64_X20, addressSpace.get64(savedRegisterLoc)); |
| 540 savedRegisterLoc -= 8; |
| 541 } |
| 542 if (encoding & UNWIND_ARM64_FRAME_X21_X22_PAIR) { |
| 543 registers.setRegister(UNW_ARM64_X21, addressSpace.get64(savedRegisterLoc)); |
| 544 savedRegisterLoc -= 8; |
| 545 registers.setRegister(UNW_ARM64_X22, addressSpace.get64(savedRegisterLoc)); |
| 546 savedRegisterLoc -= 8; |
| 547 } |
| 548 if (encoding & UNWIND_ARM64_FRAME_X23_X24_PAIR) { |
| 549 registers.setRegister(UNW_ARM64_X23, addressSpace.get64(savedRegisterLoc)); |
| 550 savedRegisterLoc -= 8; |
| 551 registers.setRegister(UNW_ARM64_X24, addressSpace.get64(savedRegisterLoc)); |
| 552 savedRegisterLoc -= 8; |
| 553 } |
| 554 if (encoding & UNWIND_ARM64_FRAME_X25_X26_PAIR) { |
| 555 registers.setRegister(UNW_ARM64_X25, addressSpace.get64(savedRegisterLoc)); |
| 556 savedRegisterLoc -= 8; |
| 557 registers.setRegister(UNW_ARM64_X26, addressSpace.get64(savedRegisterLoc)); |
| 558 savedRegisterLoc -= 8; |
| 559 } |
| 560 if (encoding & UNWIND_ARM64_FRAME_X27_X28_PAIR) { |
| 561 registers.setRegister(UNW_ARM64_X27, addressSpace.get64(savedRegisterLoc)); |
| 562 savedRegisterLoc -= 8; |
| 563 registers.setRegister(UNW_ARM64_X28, addressSpace.get64(savedRegisterLoc)); |
| 564 savedRegisterLoc -= 8; |
| 565 } |
| 566 |
| 567 if (encoding & UNWIND_ARM64_FRAME_D8_D9_PAIR) { |
| 568 registers.setFloatRegister(UNW_ARM64_D8, |
| 569 addressSpace.getDouble(savedRegisterLoc)); |
| 570 savedRegisterLoc -= 8; |
| 571 registers.setFloatRegister(UNW_ARM64_D9, |
| 572 addressSpace.getDouble(savedRegisterLoc)); |
| 573 savedRegisterLoc -= 8; |
| 574 } |
| 575 if (encoding & UNWIND_ARM64_FRAME_D10_D11_PAIR) { |
| 576 registers.setFloatRegister(UNW_ARM64_D10, |
| 577 addressSpace.getDouble(savedRegisterLoc)); |
| 578 savedRegisterLoc -= 8; |
| 579 registers.setFloatRegister(UNW_ARM64_D11, |
| 580 addressSpace.getDouble(savedRegisterLoc)); |
| 581 savedRegisterLoc -= 8; |
| 582 } |
| 583 if (encoding & UNWIND_ARM64_FRAME_D12_D13_PAIR) { |
| 584 registers.setFloatRegister(UNW_ARM64_D12, |
| 585 addressSpace.getDouble(savedRegisterLoc)); |
| 586 savedRegisterLoc -= 8; |
| 587 registers.setFloatRegister(UNW_ARM64_D13, |
| 588 addressSpace.getDouble(savedRegisterLoc)); |
| 589 savedRegisterLoc -= 8; |
| 590 } |
| 591 if (encoding & UNWIND_ARM64_FRAME_D14_D15_PAIR) { |
| 592 registers.setFloatRegister(UNW_ARM64_D14, |
| 593 addressSpace.getDouble(savedRegisterLoc)); |
| 594 savedRegisterLoc -= 8; |
| 595 registers.setFloatRegister(UNW_ARM64_D15, |
| 596 addressSpace.getDouble(savedRegisterLoc)); |
| 597 savedRegisterLoc -= 8; |
| 598 } |
| 599 |
| 600 // subtract stack size off of sp |
| 601 registers.setSP(savedRegisterLoc); |
| 602 |
| 603 // set pc to be value in lr |
| 604 registers.setIP(registers.getRegister(UNW_ARM64_LR)); |
| 605 |
| 606 return UNW_STEP_SUCCESS; |
| 607 } |
| 608 |
| 609 template <typename A> |
| 610 int CompactUnwinder_arm64<A>::stepWithCompactEncodingFrame( |
| 611 compact_unwind_encoding_t encoding, uint64_t, A &addressSpace, |
| 612 Registers_arm64 ®isters) { |
| 613 uint64_t savedRegisterLoc = registers.getFP() - 8; |
| 614 |
| 615 if (encoding & UNWIND_ARM64_FRAME_X19_X20_PAIR) { |
| 616 registers.setRegister(UNW_ARM64_X19, addressSpace.get64(savedRegisterLoc)); |
| 617 savedRegisterLoc -= 8; |
| 618 registers.setRegister(UNW_ARM64_X20, addressSpace.get64(savedRegisterLoc)); |
| 619 savedRegisterLoc -= 8; |
| 620 } |
| 621 if (encoding & UNWIND_ARM64_FRAME_X21_X22_PAIR) { |
| 622 registers.setRegister(UNW_ARM64_X21, addressSpace.get64(savedRegisterLoc)); |
| 623 savedRegisterLoc -= 8; |
| 624 registers.setRegister(UNW_ARM64_X22, addressSpace.get64(savedRegisterLoc)); |
| 625 savedRegisterLoc -= 8; |
| 626 } |
| 627 if (encoding & UNWIND_ARM64_FRAME_X23_X24_PAIR) { |
| 628 registers.setRegister(UNW_ARM64_X23, addressSpace.get64(savedRegisterLoc)); |
| 629 savedRegisterLoc -= 8; |
| 630 registers.setRegister(UNW_ARM64_X24, addressSpace.get64(savedRegisterLoc)); |
| 631 savedRegisterLoc -= 8; |
| 632 } |
| 633 if (encoding & UNWIND_ARM64_FRAME_X25_X26_PAIR) { |
| 634 registers.setRegister(UNW_ARM64_X25, addressSpace.get64(savedRegisterLoc)); |
| 635 savedRegisterLoc -= 8; |
| 636 registers.setRegister(UNW_ARM64_X26, addressSpace.get64(savedRegisterLoc)); |
| 637 savedRegisterLoc -= 8; |
| 638 } |
| 639 if (encoding & UNWIND_ARM64_FRAME_X27_X28_PAIR) { |
| 640 registers.setRegister(UNW_ARM64_X27, addressSpace.get64(savedRegisterLoc)); |
| 641 savedRegisterLoc -= 8; |
| 642 registers.setRegister(UNW_ARM64_X28, addressSpace.get64(savedRegisterLoc)); |
| 643 savedRegisterLoc -= 8; |
| 644 } |
| 645 |
| 646 if (encoding & UNWIND_ARM64_FRAME_D8_D9_PAIR) { |
| 647 registers.setFloatRegister(UNW_ARM64_D8, |
| 648 addressSpace.getDouble(savedRegisterLoc)); |
| 649 savedRegisterLoc -= 8; |
| 650 registers.setFloatRegister(UNW_ARM64_D9, |
| 651 addressSpace.getDouble(savedRegisterLoc)); |
| 652 savedRegisterLoc -= 8; |
| 653 } |
| 654 if (encoding & UNWIND_ARM64_FRAME_D10_D11_PAIR) { |
| 655 registers.setFloatRegister(UNW_ARM64_D10, |
| 656 addressSpace.getDouble(savedRegisterLoc)); |
| 657 savedRegisterLoc -= 8; |
| 658 registers.setFloatRegister(UNW_ARM64_D11, |
| 659 addressSpace.getDouble(savedRegisterLoc)); |
| 660 savedRegisterLoc -= 8; |
| 661 } |
| 662 if (encoding & UNWIND_ARM64_FRAME_D12_D13_PAIR) { |
| 663 registers.setFloatRegister(UNW_ARM64_D12, |
| 664 addressSpace.getDouble(savedRegisterLoc)); |
| 665 savedRegisterLoc -= 8; |
| 666 registers.setFloatRegister(UNW_ARM64_D13, |
| 667 addressSpace.getDouble(savedRegisterLoc)); |
| 668 savedRegisterLoc -= 8; |
| 669 } |
| 670 if (encoding & UNWIND_ARM64_FRAME_D14_D15_PAIR) { |
| 671 registers.setFloatRegister(UNW_ARM64_D14, |
| 672 addressSpace.getDouble(savedRegisterLoc)); |
| 673 savedRegisterLoc -= 8; |
| 674 registers.setFloatRegister(UNW_ARM64_D15, |
| 675 addressSpace.getDouble(savedRegisterLoc)); |
| 676 savedRegisterLoc -= 8; |
| 677 } |
| 678 |
| 679 uint64_t fp = registers.getFP(); |
| 680 // fp points to old fp |
| 681 registers.setFP(addressSpace.get64(fp)); |
| 682 // old sp is fp less saved fp and lr |
| 683 registers.setSP(fp + 16); |
| 684 // pop return address into pc |
| 685 registers.setIP(addressSpace.get64(fp + 8)); |
| 686 |
| 687 return UNW_STEP_SUCCESS; |
| 688 } |
| 689 |
| 690 |
| 691 }; // namespace libunwind |
| 692 |
| 693 #endif // __COMPACT_UNWINDER_HPP__ |
| OLD | NEW |
|---|
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