1 //===-- ObjectFileMachO.cpp -------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/ADT/StringRef.h" 11 12 #include "Plugins/Process/Utility/RegisterContextDarwin_arm.h" 13 #include "Plugins/Process/Utility/RegisterContextDarwin_arm64.h" 14 #include "Plugins/Process/Utility/RegisterContextDarwin_i386.h" 15 #include "Plugins/Process/Utility/RegisterContextDarwin_x86_64.h" 16 #include "lldb/Core/Debugger.h" 17 #include "lldb/Core/FileSpecList.h" 18 #include "lldb/Core/Module.h" 19 #include "lldb/Core/ModuleSpec.h" 20 #include "lldb/Core/PluginManager.h" 21 #include "lldb/Core/RangeMap.h" 22 #include "lldb/Core/Section.h" 23 #include "lldb/Core/StreamFile.h" 24 #include "lldb/Host/Host.h" 25 #include "lldb/Symbol/DWARFCallFrameInfo.h" 26 #include "lldb/Symbol/ObjectFile.h" 27 #include "lldb/Target/DynamicLoader.h" 28 #include "lldb/Target/MemoryRegionInfo.h" 29 #include "lldb/Target/Platform.h" 30 #include "lldb/Target/Process.h" 31 #include "lldb/Target/SectionLoadList.h" 32 #include "lldb/Target/Target.h" 33 #include "lldb/Target/Thread.h" 34 #include "lldb/Target/ThreadList.h" 35 #include "lldb/Utility/ArchSpec.h" 36 #include "lldb/Utility/DataBuffer.h" 37 #include "lldb/Utility/FileSpec.h" 38 #include "lldb/Utility/Log.h" 39 #include "lldb/Utility/RegisterValue.h" 40 #include "lldb/Utility/Status.h" 41 #include "lldb/Utility/StreamString.h" 42 #include "lldb/Utility/Timer.h" 43 #include "lldb/Utility/UUID.h" 44 45 #include "lldb/Host/SafeMachO.h" 46 47 #include "llvm/Support/MemoryBuffer.h" 48 49 #include "ObjectFileMachO.h" 50 51 #if defined(__APPLE__) && \ 52 (defined(__arm__) || defined(__arm64__) || defined(__aarch64__)) 53 // GetLLDBSharedCacheUUID() needs to call dlsym() 54 #include <dlfcn.h> 55 #endif 56 57 #ifndef __APPLE__ 58 #include "Utility/UuidCompatibility.h" 59 #else 60 #include <uuid/uuid.h> 61 #endif 62 63 #define THUMB_ADDRESS_BIT_MASK 0xfffffffffffffffeull 64 using namespace lldb; 65 using namespace lldb_private; 66 using namespace llvm::MachO; 67 68 // Some structure definitions needed for parsing the dyld shared cache files 69 // found on iOS devices. 70 71 struct lldb_copy_dyld_cache_header_v1 { 72 char magic[16]; // e.g. "dyld_v0 i386", "dyld_v1 armv7", etc. 73 uint32_t mappingOffset; // file offset to first dyld_cache_mapping_info 74 uint32_t mappingCount; // number of dyld_cache_mapping_info entries 75 uint32_t imagesOffset; 76 uint32_t imagesCount; 77 uint64_t dyldBaseAddress; 78 uint64_t codeSignatureOffset; 79 uint64_t codeSignatureSize; 80 uint64_t slideInfoOffset; 81 uint64_t slideInfoSize; 82 uint64_t localSymbolsOffset; 83 uint64_t localSymbolsSize; 84 uint8_t uuid[16]; // v1 and above, also recorded in dyld_all_image_infos v13 85 // and later 86 }; 87 88 struct lldb_copy_dyld_cache_mapping_info { 89 uint64_t address; 90 uint64_t size; 91 uint64_t fileOffset; 92 uint32_t maxProt; 93 uint32_t initProt; 94 }; 95 96 struct lldb_copy_dyld_cache_local_symbols_info { 97 uint32_t nlistOffset; 98 uint32_t nlistCount; 99 uint32_t stringsOffset; 100 uint32_t stringsSize; 101 uint32_t entriesOffset; 102 uint32_t entriesCount; 103 }; 104 struct lldb_copy_dyld_cache_local_symbols_entry { 105 uint32_t dylibOffset; 106 uint32_t nlistStartIndex; 107 uint32_t nlistCount; 108 }; 109 110 class RegisterContextDarwin_x86_64_Mach : public RegisterContextDarwin_x86_64 { 111 public: 112 RegisterContextDarwin_x86_64_Mach(lldb_private::Thread &thread, 113 const DataExtractor &data) 114 : RegisterContextDarwin_x86_64(thread, 0) { 115 SetRegisterDataFrom_LC_THREAD(data); 116 } 117 118 void InvalidateAllRegisters() override { 119 // Do nothing... registers are always valid... 120 } 121 122 void SetRegisterDataFrom_LC_THREAD(const DataExtractor &data) { 123 lldb::offset_t offset = 0; 124 SetError(GPRRegSet, Read, -1); 125 SetError(FPURegSet, Read, -1); 126 SetError(EXCRegSet, Read, -1); 127 bool done = false; 128 129 while (!done) { 130 int flavor = data.GetU32(&offset); 131 if (flavor == 0) 132 done = true; 133 else { 134 uint32_t i; 135 uint32_t count = data.GetU32(&offset); 136 switch (flavor) { 137 case GPRRegSet: 138 for (i = 0; i < count; ++i) 139 (&gpr.rax)[i] = data.GetU64(&offset); 140 SetError(GPRRegSet, Read, 0); 141 done = true; 142 143 break; 144 case FPURegSet: 145 // TODO: fill in FPU regs.... 146 // SetError (FPURegSet, Read, -1); 147 done = true; 148 149 break; 150 case EXCRegSet: 151 exc.trapno = data.GetU32(&offset); 152 exc.err = data.GetU32(&offset); 153 exc.faultvaddr = data.GetU64(&offset); 154 SetError(EXCRegSet, Read, 0); 155 done = true; 156 break; 157 case 7: 158 case 8: 159 case 9: 160 // fancy flavors that encapsulate of the above flavors... 161 break; 162 163 default: 164 done = true; 165 break; 166 } 167 } 168 } 169 } 170 171 static size_t WriteRegister(RegisterContext *reg_ctx, const char *name, 172 const char *alt_name, size_t reg_byte_size, 173 Stream &data) { 174 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName(name); 175 if (reg_info == NULL) 176 reg_info = reg_ctx->GetRegisterInfoByName(alt_name); 177 if (reg_info) { 178 lldb_private::RegisterValue reg_value; 179 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 180 if (reg_info->byte_size >= reg_byte_size) 181 data.Write(reg_value.GetBytes(), reg_byte_size); 182 else { 183 data.Write(reg_value.GetBytes(), reg_info->byte_size); 184 for (size_t i = 0, n = reg_byte_size - reg_info->byte_size; i < n; 185 ++i) 186 data.PutChar(0); 187 } 188 return reg_byte_size; 189 } 190 } 191 // Just write zeros if all else fails 192 for (size_t i = 0; i < reg_byte_size; ++i) 193 data.PutChar(0); 194 return reg_byte_size; 195 } 196 197 static bool Create_LC_THREAD(Thread *thread, Stream &data) { 198 RegisterContextSP reg_ctx_sp(thread->GetRegisterContext()); 199 if (reg_ctx_sp) { 200 RegisterContext *reg_ctx = reg_ctx_sp.get(); 201 202 data.PutHex32(GPRRegSet); // Flavor 203 data.PutHex32(GPRWordCount); 204 WriteRegister(reg_ctx, "rax", NULL, 8, data); 205 WriteRegister(reg_ctx, "rbx", NULL, 8, data); 206 WriteRegister(reg_ctx, "rcx", NULL, 8, data); 207 WriteRegister(reg_ctx, "rdx", NULL, 8, data); 208 WriteRegister(reg_ctx, "rdi", NULL, 8, data); 209 WriteRegister(reg_ctx, "rsi", NULL, 8, data); 210 WriteRegister(reg_ctx, "rbp", NULL, 8, data); 211 WriteRegister(reg_ctx, "rsp", NULL, 8, data); 212 WriteRegister(reg_ctx, "r8", NULL, 8, data); 213 WriteRegister(reg_ctx, "r9", NULL, 8, data); 214 WriteRegister(reg_ctx, "r10", NULL, 8, data); 215 WriteRegister(reg_ctx, "r11", NULL, 8, data); 216 WriteRegister(reg_ctx, "r12", NULL, 8, data); 217 WriteRegister(reg_ctx, "r13", NULL, 8, data); 218 WriteRegister(reg_ctx, "r14", NULL, 8, data); 219 WriteRegister(reg_ctx, "r15", NULL, 8, data); 220 WriteRegister(reg_ctx, "rip", NULL, 8, data); 221 WriteRegister(reg_ctx, "rflags", NULL, 8, data); 222 WriteRegister(reg_ctx, "cs", NULL, 8, data); 223 WriteRegister(reg_ctx, "fs", NULL, 8, data); 224 WriteRegister(reg_ctx, "gs", NULL, 8, data); 225 226 // // Write out the FPU registers 227 // const size_t fpu_byte_size = sizeof(FPU); 228 // size_t bytes_written = 0; 229 // data.PutHex32 (FPURegSet); 230 // data.PutHex32 (fpu_byte_size/sizeof(uint64_t)); 231 // bytes_written += data.PutHex32(0); // uint32_t pad[0] 232 // bytes_written += data.PutHex32(0); // uint32_t pad[1] 233 // bytes_written += WriteRegister (reg_ctx, "fcw", "fctrl", 2, 234 // data); // uint16_t fcw; // "fctrl" 235 // bytes_written += WriteRegister (reg_ctx, "fsw" , "fstat", 2, 236 // data); // uint16_t fsw; // "fstat" 237 // bytes_written += WriteRegister (reg_ctx, "ftw" , "ftag", 1, 238 // data); // uint8_t ftw; // "ftag" 239 // bytes_written += data.PutHex8 (0); // uint8_t pad1; 240 // bytes_written += WriteRegister (reg_ctx, "fop" , NULL, 2, 241 // data); // uint16_t fop; // "fop" 242 // bytes_written += WriteRegister (reg_ctx, "fioff", "ip", 4, 243 // data); // uint32_t ip; // "fioff" 244 // bytes_written += WriteRegister (reg_ctx, "fiseg", NULL, 2, 245 // data); // uint16_t cs; // "fiseg" 246 // bytes_written += data.PutHex16 (0); // uint16_t pad2; 247 // bytes_written += WriteRegister (reg_ctx, "dp", "fooff" , 4, 248 // data); // uint32_t dp; // "fooff" 249 // bytes_written += WriteRegister (reg_ctx, "foseg", NULL, 2, 250 // data); // uint16_t ds; // "foseg" 251 // bytes_written += data.PutHex16 (0); // uint16_t pad3; 252 // bytes_written += WriteRegister (reg_ctx, "mxcsr", NULL, 4, 253 // data); // uint32_t mxcsr; 254 // bytes_written += WriteRegister (reg_ctx, "mxcsrmask", NULL, 255 // 4, data);// uint32_t mxcsrmask; 256 // bytes_written += WriteRegister (reg_ctx, "stmm0", NULL, 257 // sizeof(MMSReg), data); 258 // bytes_written += WriteRegister (reg_ctx, "stmm1", NULL, 259 // sizeof(MMSReg), data); 260 // bytes_written += WriteRegister (reg_ctx, "stmm2", NULL, 261 // sizeof(MMSReg), data); 262 // bytes_written += WriteRegister (reg_ctx, "stmm3", NULL, 263 // sizeof(MMSReg), data); 264 // bytes_written += WriteRegister (reg_ctx, "stmm4", NULL, 265 // sizeof(MMSReg), data); 266 // bytes_written += WriteRegister (reg_ctx, "stmm5", NULL, 267 // sizeof(MMSReg), data); 268 // bytes_written += WriteRegister (reg_ctx, "stmm6", NULL, 269 // sizeof(MMSReg), data); 270 // bytes_written += WriteRegister (reg_ctx, "stmm7", NULL, 271 // sizeof(MMSReg), data); 272 // bytes_written += WriteRegister (reg_ctx, "xmm0" , NULL, 273 // sizeof(XMMReg), data); 274 // bytes_written += WriteRegister (reg_ctx, "xmm1" , NULL, 275 // sizeof(XMMReg), data); 276 // bytes_written += WriteRegister (reg_ctx, "xmm2" , NULL, 277 // sizeof(XMMReg), data); 278 // bytes_written += WriteRegister (reg_ctx, "xmm3" , NULL, 279 // sizeof(XMMReg), data); 280 // bytes_written += WriteRegister (reg_ctx, "xmm4" , NULL, 281 // sizeof(XMMReg), data); 282 // bytes_written += WriteRegister (reg_ctx, "xmm5" , NULL, 283 // sizeof(XMMReg), data); 284 // bytes_written += WriteRegister (reg_ctx, "xmm6" , NULL, 285 // sizeof(XMMReg), data); 286 // bytes_written += WriteRegister (reg_ctx, "xmm7" , NULL, 287 // sizeof(XMMReg), data); 288 // bytes_written += WriteRegister (reg_ctx, "xmm8" , NULL, 289 // sizeof(XMMReg), data); 290 // bytes_written += WriteRegister (reg_ctx, "xmm9" , NULL, 291 // sizeof(XMMReg), data); 292 // bytes_written += WriteRegister (reg_ctx, "xmm10", NULL, 293 // sizeof(XMMReg), data); 294 // bytes_written += WriteRegister (reg_ctx, "xmm11", NULL, 295 // sizeof(XMMReg), data); 296 // bytes_written += WriteRegister (reg_ctx, "xmm12", NULL, 297 // sizeof(XMMReg), data); 298 // bytes_written += WriteRegister (reg_ctx, "xmm13", NULL, 299 // sizeof(XMMReg), data); 300 // bytes_written += WriteRegister (reg_ctx, "xmm14", NULL, 301 // sizeof(XMMReg), data); 302 // bytes_written += WriteRegister (reg_ctx, "xmm15", NULL, 303 // sizeof(XMMReg), data); 304 // 305 // // Fill rest with zeros 306 // for (size_t i=0, n = fpu_byte_size - bytes_written; i<n; ++ 307 // i) 308 // data.PutChar(0); 309 310 // Write out the EXC registers 311 data.PutHex32(EXCRegSet); 312 data.PutHex32(EXCWordCount); 313 WriteRegister(reg_ctx, "trapno", NULL, 4, data); 314 WriteRegister(reg_ctx, "err", NULL, 4, data); 315 WriteRegister(reg_ctx, "faultvaddr", NULL, 8, data); 316 return true; 317 } 318 return false; 319 } 320 321 protected: 322 int DoReadGPR(lldb::tid_t tid, int flavor, GPR &gpr) override { return 0; } 323 324 int DoReadFPU(lldb::tid_t tid, int flavor, FPU &fpu) override { return 0; } 325 326 int DoReadEXC(lldb::tid_t tid, int flavor, EXC &exc) override { return 0; } 327 328 int DoWriteGPR(lldb::tid_t tid, int flavor, const GPR &gpr) override { 329 return 0; 330 } 331 332 int DoWriteFPU(lldb::tid_t tid, int flavor, const FPU &fpu) override { 333 return 0; 334 } 335 336 int DoWriteEXC(lldb::tid_t tid, int flavor, const EXC &exc) override { 337 return 0; 338 } 339 }; 340 341 class RegisterContextDarwin_i386_Mach : public RegisterContextDarwin_i386 { 342 public: 343 RegisterContextDarwin_i386_Mach(lldb_private::Thread &thread, 344 const DataExtractor &data) 345 : RegisterContextDarwin_i386(thread, 0) { 346 SetRegisterDataFrom_LC_THREAD(data); 347 } 348 349 void InvalidateAllRegisters() override { 350 // Do nothing... registers are always valid... 351 } 352 353 void SetRegisterDataFrom_LC_THREAD(const DataExtractor &data) { 354 lldb::offset_t offset = 0; 355 SetError(GPRRegSet, Read, -1); 356 SetError(FPURegSet, Read, -1); 357 SetError(EXCRegSet, Read, -1); 358 bool done = false; 359 360 while (!done) { 361 int flavor = data.GetU32(&offset); 362 if (flavor == 0) 363 done = true; 364 else { 365 uint32_t i; 366 uint32_t count = data.GetU32(&offset); 367 switch (flavor) { 368 case GPRRegSet: 369 for (i = 0; i < count; ++i) 370 (&gpr.eax)[i] = data.GetU32(&offset); 371 SetError(GPRRegSet, Read, 0); 372 done = true; 373 374 break; 375 case FPURegSet: 376 // TODO: fill in FPU regs.... 377 // SetError (FPURegSet, Read, -1); 378 done = true; 379 380 break; 381 case EXCRegSet: 382 exc.trapno = data.GetU32(&offset); 383 exc.err = data.GetU32(&offset); 384 exc.faultvaddr = data.GetU32(&offset); 385 SetError(EXCRegSet, Read, 0); 386 done = true; 387 break; 388 case 7: 389 case 8: 390 case 9: 391 // fancy flavors that encapsulate of the above flavors... 392 break; 393 394 default: 395 done = true; 396 break; 397 } 398 } 399 } 400 } 401 402 static size_t WriteRegister(RegisterContext *reg_ctx, const char *name, 403 const char *alt_name, size_t reg_byte_size, 404 Stream &data) { 405 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName(name); 406 if (reg_info == NULL) 407 reg_info = reg_ctx->GetRegisterInfoByName(alt_name); 408 if (reg_info) { 409 lldb_private::RegisterValue reg_value; 410 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 411 if (reg_info->byte_size >= reg_byte_size) 412 data.Write(reg_value.GetBytes(), reg_byte_size); 413 else { 414 data.Write(reg_value.GetBytes(), reg_info->byte_size); 415 for (size_t i = 0, n = reg_byte_size - reg_info->byte_size; i < n; 416 ++i) 417 data.PutChar(0); 418 } 419 return reg_byte_size; 420 } 421 } 422 // Just write zeros if all else fails 423 for (size_t i = 0; i < reg_byte_size; ++i) 424 data.PutChar(0); 425 return reg_byte_size; 426 } 427 428 static bool Create_LC_THREAD(Thread *thread, Stream &data) { 429 RegisterContextSP reg_ctx_sp(thread->GetRegisterContext()); 430 if (reg_ctx_sp) { 431 RegisterContext *reg_ctx = reg_ctx_sp.get(); 432 433 data.PutHex32(GPRRegSet); // Flavor 434 data.PutHex32(GPRWordCount); 435 WriteRegister(reg_ctx, "eax", NULL, 4, data); 436 WriteRegister(reg_ctx, "ebx", NULL, 4, data); 437 WriteRegister(reg_ctx, "ecx", NULL, 4, data); 438 WriteRegister(reg_ctx, "edx", NULL, 4, data); 439 WriteRegister(reg_ctx, "edi", NULL, 4, data); 440 WriteRegister(reg_ctx, "esi", NULL, 4, data); 441 WriteRegister(reg_ctx, "ebp", NULL, 4, data); 442 WriteRegister(reg_ctx, "esp", NULL, 4, data); 443 WriteRegister(reg_ctx, "ss", NULL, 4, data); 444 WriteRegister(reg_ctx, "eflags", NULL, 4, data); 445 WriteRegister(reg_ctx, "eip", NULL, 4, data); 446 WriteRegister(reg_ctx, "cs", NULL, 4, data); 447 WriteRegister(reg_ctx, "ds", NULL, 4, data); 448 WriteRegister(reg_ctx, "es", NULL, 4, data); 449 WriteRegister(reg_ctx, "fs", NULL, 4, data); 450 WriteRegister(reg_ctx, "gs", NULL, 4, data); 451 452 // Write out the EXC registers 453 data.PutHex32(EXCRegSet); 454 data.PutHex32(EXCWordCount); 455 WriteRegister(reg_ctx, "trapno", NULL, 4, data); 456 WriteRegister(reg_ctx, "err", NULL, 4, data); 457 WriteRegister(reg_ctx, "faultvaddr", NULL, 4, data); 458 return true; 459 } 460 return false; 461 } 462 463 protected: 464 int DoReadGPR(lldb::tid_t tid, int flavor, GPR &gpr) override { return 0; } 465 466 int DoReadFPU(lldb::tid_t tid, int flavor, FPU &fpu) override { return 0; } 467 468 int DoReadEXC(lldb::tid_t tid, int flavor, EXC &exc) override { return 0; } 469 470 int DoWriteGPR(lldb::tid_t tid, int flavor, const GPR &gpr) override { 471 return 0; 472 } 473 474 int DoWriteFPU(lldb::tid_t tid, int flavor, const FPU &fpu) override { 475 return 0; 476 } 477 478 int DoWriteEXC(lldb::tid_t tid, int flavor, const EXC &exc) override { 479 return 0; 480 } 481 }; 482 483 class RegisterContextDarwin_arm_Mach : public RegisterContextDarwin_arm { 484 public: 485 RegisterContextDarwin_arm_Mach(lldb_private::Thread &thread, 486 const DataExtractor &data) 487 : RegisterContextDarwin_arm(thread, 0) { 488 SetRegisterDataFrom_LC_THREAD(data); 489 } 490 491 void InvalidateAllRegisters() override { 492 // Do nothing... registers are always valid... 493 } 494 495 void SetRegisterDataFrom_LC_THREAD(const DataExtractor &data) { 496 lldb::offset_t offset = 0; 497 SetError(GPRRegSet, Read, -1); 498 SetError(FPURegSet, Read, -1); 499 SetError(EXCRegSet, Read, -1); 500 bool done = false; 501 502 while (!done) { 503 int flavor = data.GetU32(&offset); 504 uint32_t count = data.GetU32(&offset); 505 lldb::offset_t next_thread_state = offset + (count * 4); 506 switch (flavor) { 507 case GPRAltRegSet: 508 case GPRRegSet: 509 for (uint32_t i = 0; i < count; ++i) { 510 gpr.r[i] = data.GetU32(&offset); 511 } 512 513 // Note that gpr.cpsr is also copied by the above loop; this loop 514 // technically extends one element past the end of the gpr.r[] array. 515 516 SetError(GPRRegSet, Read, 0); 517 offset = next_thread_state; 518 break; 519 520 case FPURegSet: { 521 uint8_t *fpu_reg_buf = (uint8_t *)&fpu.floats.s[0]; 522 const int fpu_reg_buf_size = sizeof(fpu.floats); 523 if (data.ExtractBytes(offset, fpu_reg_buf_size, eByteOrderLittle, 524 fpu_reg_buf) == fpu_reg_buf_size) { 525 offset += fpu_reg_buf_size; 526 fpu.fpscr = data.GetU32(&offset); 527 SetError(FPURegSet, Read, 0); 528 } else { 529 done = true; 530 } 531 } 532 offset = next_thread_state; 533 break; 534 535 case EXCRegSet: 536 if (count == 3) { 537 exc.exception = data.GetU32(&offset); 538 exc.fsr = data.GetU32(&offset); 539 exc.far = data.GetU32(&offset); 540 SetError(EXCRegSet, Read, 0); 541 } 542 done = true; 543 offset = next_thread_state; 544 break; 545 546 // Unknown register set flavor, stop trying to parse. 547 default: 548 done = true; 549 } 550 } 551 } 552 553 static size_t WriteRegister(RegisterContext *reg_ctx, const char *name, 554 const char *alt_name, size_t reg_byte_size, 555 Stream &data) { 556 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName(name); 557 if (reg_info == NULL) 558 reg_info = reg_ctx->GetRegisterInfoByName(alt_name); 559 if (reg_info) { 560 lldb_private::RegisterValue reg_value; 561 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 562 if (reg_info->byte_size >= reg_byte_size) 563 data.Write(reg_value.GetBytes(), reg_byte_size); 564 else { 565 data.Write(reg_value.GetBytes(), reg_info->byte_size); 566 for (size_t i = 0, n = reg_byte_size - reg_info->byte_size; i < n; 567 ++i) 568 data.PutChar(0); 569 } 570 return reg_byte_size; 571 } 572 } 573 // Just write zeros if all else fails 574 for (size_t i = 0; i < reg_byte_size; ++i) 575 data.PutChar(0); 576 return reg_byte_size; 577 } 578 579 static bool Create_LC_THREAD(Thread *thread, Stream &data) { 580 RegisterContextSP reg_ctx_sp(thread->GetRegisterContext()); 581 if (reg_ctx_sp) { 582 RegisterContext *reg_ctx = reg_ctx_sp.get(); 583 584 data.PutHex32(GPRRegSet); // Flavor 585 data.PutHex32(GPRWordCount); 586 WriteRegister(reg_ctx, "r0", NULL, 4, data); 587 WriteRegister(reg_ctx, "r1", NULL, 4, data); 588 WriteRegister(reg_ctx, "r2", NULL, 4, data); 589 WriteRegister(reg_ctx, "r3", NULL, 4, data); 590 WriteRegister(reg_ctx, "r4", NULL, 4, data); 591 WriteRegister(reg_ctx, "r5", NULL, 4, data); 592 WriteRegister(reg_ctx, "r6", NULL, 4, data); 593 WriteRegister(reg_ctx, "r7", NULL, 4, data); 594 WriteRegister(reg_ctx, "r8", NULL, 4, data); 595 WriteRegister(reg_ctx, "r9", NULL, 4, data); 596 WriteRegister(reg_ctx, "r10", NULL, 4, data); 597 WriteRegister(reg_ctx, "r11", NULL, 4, data); 598 WriteRegister(reg_ctx, "r12", NULL, 4, data); 599 WriteRegister(reg_ctx, "sp", NULL, 4, data); 600 WriteRegister(reg_ctx, "lr", NULL, 4, data); 601 WriteRegister(reg_ctx, "pc", NULL, 4, data); 602 WriteRegister(reg_ctx, "cpsr", NULL, 4, data); 603 604 // Write out the EXC registers 605 // data.PutHex32 (EXCRegSet); 606 // data.PutHex32 (EXCWordCount); 607 // WriteRegister (reg_ctx, "exception", NULL, 4, data); 608 // WriteRegister (reg_ctx, "fsr", NULL, 4, data); 609 // WriteRegister (reg_ctx, "far", NULL, 4, data); 610 return true; 611 } 612 return false; 613 } 614 615 protected: 616 int DoReadGPR(lldb::tid_t tid, int flavor, GPR &gpr) override { return -1; } 617 618 int DoReadFPU(lldb::tid_t tid, int flavor, FPU &fpu) override { return -1; } 619 620 int DoReadEXC(lldb::tid_t tid, int flavor, EXC &exc) override { return -1; } 621 622 int DoReadDBG(lldb::tid_t tid, int flavor, DBG &dbg) override { return -1; } 623 624 int DoWriteGPR(lldb::tid_t tid, int flavor, const GPR &gpr) override { 625 return 0; 626 } 627 628 int DoWriteFPU(lldb::tid_t tid, int flavor, const FPU &fpu) override { 629 return 0; 630 } 631 632 int DoWriteEXC(lldb::tid_t tid, int flavor, const EXC &exc) override { 633 return 0; 634 } 635 636 int DoWriteDBG(lldb::tid_t tid, int flavor, const DBG &dbg) override { 637 return -1; 638 } 639 }; 640 641 class RegisterContextDarwin_arm64_Mach : public RegisterContextDarwin_arm64 { 642 public: 643 RegisterContextDarwin_arm64_Mach(lldb_private::Thread &thread, 644 const DataExtractor &data) 645 : RegisterContextDarwin_arm64(thread, 0) { 646 SetRegisterDataFrom_LC_THREAD(data); 647 } 648 649 void InvalidateAllRegisters() override { 650 // Do nothing... registers are always valid... 651 } 652 653 void SetRegisterDataFrom_LC_THREAD(const DataExtractor &data) { 654 lldb::offset_t offset = 0; 655 SetError(GPRRegSet, Read, -1); 656 SetError(FPURegSet, Read, -1); 657 SetError(EXCRegSet, Read, -1); 658 bool done = false; 659 while (!done) { 660 int flavor = data.GetU32(&offset); 661 uint32_t count = data.GetU32(&offset); 662 lldb::offset_t next_thread_state = offset + (count * 4); 663 switch (flavor) { 664 case GPRRegSet: 665 // x0-x29 + fp + lr + sp + pc (== 33 64-bit registers) plus cpsr (1 666 // 32-bit register) 667 if (count >= (33 * 2) + 1) { 668 for (uint32_t i = 0; i < 29; ++i) 669 gpr.x[i] = data.GetU64(&offset); 670 gpr.fp = data.GetU64(&offset); 671 gpr.lr = data.GetU64(&offset); 672 gpr.sp = data.GetU64(&offset); 673 gpr.pc = data.GetU64(&offset); 674 gpr.cpsr = data.GetU32(&offset); 675 SetError(GPRRegSet, Read, 0); 676 } 677 offset = next_thread_state; 678 break; 679 case FPURegSet: { 680 uint8_t *fpu_reg_buf = (uint8_t *)&fpu.v[0]; 681 const int fpu_reg_buf_size = sizeof(fpu); 682 if (fpu_reg_buf_size == count * sizeof(uint32_t) && 683 data.ExtractBytes(offset, fpu_reg_buf_size, eByteOrderLittle, 684 fpu_reg_buf) == fpu_reg_buf_size) { 685 SetError(FPURegSet, Read, 0); 686 } else { 687 done = true; 688 } 689 } 690 offset = next_thread_state; 691 break; 692 case EXCRegSet: 693 if (count == 4) { 694 exc.far = data.GetU64(&offset); 695 exc.esr = data.GetU32(&offset); 696 exc.exception = data.GetU32(&offset); 697 SetError(EXCRegSet, Read, 0); 698 } 699 offset = next_thread_state; 700 break; 701 default: 702 done = true; 703 break; 704 } 705 } 706 } 707 708 static size_t WriteRegister(RegisterContext *reg_ctx, const char *name, 709 const char *alt_name, size_t reg_byte_size, 710 Stream &data) { 711 const RegisterInfo *reg_info = reg_ctx->GetRegisterInfoByName(name); 712 if (reg_info == NULL) 713 reg_info = reg_ctx->GetRegisterInfoByName(alt_name); 714 if (reg_info) { 715 lldb_private::RegisterValue reg_value; 716 if (reg_ctx->ReadRegister(reg_info, reg_value)) { 717 if (reg_info->byte_size >= reg_byte_size) 718 data.Write(reg_value.GetBytes(), reg_byte_size); 719 else { 720 data.Write(reg_value.GetBytes(), reg_info->byte_size); 721 for (size_t i = 0, n = reg_byte_size - reg_info->byte_size; i < n; 722 ++i) 723 data.PutChar(0); 724 } 725 return reg_byte_size; 726 } 727 } 728 // Just write zeros if all else fails 729 for (size_t i = 0; i < reg_byte_size; ++i) 730 data.PutChar(0); 731 return reg_byte_size; 732 } 733 734 static bool Create_LC_THREAD(Thread *thread, Stream &data) { 735 RegisterContextSP reg_ctx_sp(thread->GetRegisterContext()); 736 if (reg_ctx_sp) { 737 RegisterContext *reg_ctx = reg_ctx_sp.get(); 738 739 data.PutHex32(GPRRegSet); // Flavor 740 data.PutHex32(GPRWordCount); 741 WriteRegister(reg_ctx, "x0", NULL, 8, data); 742 WriteRegister(reg_ctx, "x1", NULL, 8, data); 743 WriteRegister(reg_ctx, "x2", NULL, 8, data); 744 WriteRegister(reg_ctx, "x3", NULL, 8, data); 745 WriteRegister(reg_ctx, "x4", NULL, 8, data); 746 WriteRegister(reg_ctx, "x5", NULL, 8, data); 747 WriteRegister(reg_ctx, "x6", NULL, 8, data); 748 WriteRegister(reg_ctx, "x7", NULL, 8, data); 749 WriteRegister(reg_ctx, "x8", NULL, 8, data); 750 WriteRegister(reg_ctx, "x9", NULL, 8, data); 751 WriteRegister(reg_ctx, "x10", NULL, 8, data); 752 WriteRegister(reg_ctx, "x11", NULL, 8, data); 753 WriteRegister(reg_ctx, "x12", NULL, 8, data); 754 WriteRegister(reg_ctx, "x13", NULL, 8, data); 755 WriteRegister(reg_ctx, "x14", NULL, 8, data); 756 WriteRegister(reg_ctx, "x15", NULL, 8, data); 757 WriteRegister(reg_ctx, "x16", NULL, 8, data); 758 WriteRegister(reg_ctx, "x17", NULL, 8, data); 759 WriteRegister(reg_ctx, "x18", NULL, 8, data); 760 WriteRegister(reg_ctx, "x19", NULL, 8, data); 761 WriteRegister(reg_ctx, "x20", NULL, 8, data); 762 WriteRegister(reg_ctx, "x21", NULL, 8, data); 763 WriteRegister(reg_ctx, "x22", NULL, 8, data); 764 WriteRegister(reg_ctx, "x23", NULL, 8, data); 765 WriteRegister(reg_ctx, "x24", NULL, 8, data); 766 WriteRegister(reg_ctx, "x25", NULL, 8, data); 767 WriteRegister(reg_ctx, "x26", NULL, 8, data); 768 WriteRegister(reg_ctx, "x27", NULL, 8, data); 769 WriteRegister(reg_ctx, "x28", NULL, 8, data); 770 WriteRegister(reg_ctx, "fp", NULL, 8, data); 771 WriteRegister(reg_ctx, "lr", NULL, 8, data); 772 WriteRegister(reg_ctx, "sp", NULL, 8, data); 773 WriteRegister(reg_ctx, "pc", NULL, 8, data); 774 WriteRegister(reg_ctx, "cpsr", NULL, 4, data); 775 776 // Write out the EXC registers 777 // data.PutHex32 (EXCRegSet); 778 // data.PutHex32 (EXCWordCount); 779 // WriteRegister (reg_ctx, "far", NULL, 8, data); 780 // WriteRegister (reg_ctx, "esr", NULL, 4, data); 781 // WriteRegister (reg_ctx, "exception", NULL, 4, data); 782 return true; 783 } 784 return false; 785 } 786 787 protected: 788 int DoReadGPR(lldb::tid_t tid, int flavor, GPR &gpr) override { return -1; } 789 790 int DoReadFPU(lldb::tid_t tid, int flavor, FPU &fpu) override { return -1; } 791 792 int DoReadEXC(lldb::tid_t tid, int flavor, EXC &exc) override { return -1; } 793 794 int DoReadDBG(lldb::tid_t tid, int flavor, DBG &dbg) override { return -1; } 795 796 int DoWriteGPR(lldb::tid_t tid, int flavor, const GPR &gpr) override { 797 return 0; 798 } 799 800 int DoWriteFPU(lldb::tid_t tid, int flavor, const FPU &fpu) override { 801 return 0; 802 } 803 804 int DoWriteEXC(lldb::tid_t tid, int flavor, const EXC &exc) override { 805 return 0; 806 } 807 808 int DoWriteDBG(lldb::tid_t tid, int flavor, const DBG &dbg) override { 809 return -1; 810 } 811 }; 812 813 static uint32_t MachHeaderSizeFromMagic(uint32_t magic) { 814 switch (magic) { 815 case MH_MAGIC: 816 case MH_CIGAM: 817 return sizeof(struct mach_header); 818 819 case MH_MAGIC_64: 820 case MH_CIGAM_64: 821 return sizeof(struct mach_header_64); 822 break; 823 824 default: 825 break; 826 } 827 return 0; 828 } 829 830 #define MACHO_NLIST_ARM_SYMBOL_IS_THUMB 0x0008 831 832 void ObjectFileMachO::Initialize() { 833 PluginManager::RegisterPlugin( 834 GetPluginNameStatic(), GetPluginDescriptionStatic(), CreateInstance, 835 CreateMemoryInstance, GetModuleSpecifications, SaveCore); 836 } 837 838 void ObjectFileMachO::Terminate() { 839 PluginManager::UnregisterPlugin(CreateInstance); 840 } 841 842 lldb_private::ConstString ObjectFileMachO::GetPluginNameStatic() { 843 static ConstString g_name("mach-o"); 844 return g_name; 845 } 846 847 const char *ObjectFileMachO::GetPluginDescriptionStatic() { 848 return "Mach-o object file reader (32 and 64 bit)"; 849 } 850 851 ObjectFile *ObjectFileMachO::CreateInstance(const lldb::ModuleSP &module_sp, 852 DataBufferSP &data_sp, 853 lldb::offset_t data_offset, 854 const FileSpec *file, 855 lldb::offset_t file_offset, 856 lldb::offset_t length) { 857 if (!data_sp) { 858 data_sp = MapFileData(*file, length, file_offset); 859 if (!data_sp) 860 return nullptr; 861 data_offset = 0; 862 } 863 864 if (!ObjectFileMachO::MagicBytesMatch(data_sp, data_offset, length)) 865 return nullptr; 866 867 // Update the data to contain the entire file if it doesn't already 868 if (data_sp->GetByteSize() < length) { 869 data_sp = MapFileData(*file, length, file_offset); 870 if (!data_sp) 871 return nullptr; 872 data_offset = 0; 873 } 874 auto objfile_ap = llvm::make_unique<ObjectFileMachO>( 875 module_sp, data_sp, data_offset, file, file_offset, length); 876 if (!objfile_ap || !objfile_ap->ParseHeader()) 877 return nullptr; 878 879 return objfile_ap.release(); 880 } 881 882 ObjectFile *ObjectFileMachO::CreateMemoryInstance( 883 const lldb::ModuleSP &module_sp, DataBufferSP &data_sp, 884 const ProcessSP &process_sp, lldb::addr_t header_addr) { 885 if (ObjectFileMachO::MagicBytesMatch(data_sp, 0, data_sp->GetByteSize())) { 886 std::unique_ptr<ObjectFile> objfile_ap( 887 new ObjectFileMachO(module_sp, data_sp, process_sp, header_addr)); 888 if (objfile_ap.get() && objfile_ap->ParseHeader()) 889 return objfile_ap.release(); 890 } 891 return NULL; 892 } 893 894 size_t ObjectFileMachO::GetModuleSpecifications( 895 const lldb_private::FileSpec &file, lldb::DataBufferSP &data_sp, 896 lldb::offset_t data_offset, lldb::offset_t file_offset, 897 lldb::offset_t length, lldb_private::ModuleSpecList &specs) { 898 const size_t initial_count = specs.GetSize(); 899 900 if (ObjectFileMachO::MagicBytesMatch(data_sp, 0, data_sp->GetByteSize())) { 901 DataExtractor data; 902 data.SetData(data_sp); 903 llvm::MachO::mach_header header; 904 if (ParseHeader(data, &data_offset, header)) { 905 size_t header_and_load_cmds = 906 header.sizeofcmds + MachHeaderSizeFromMagic(header.magic); 907 if (header_and_load_cmds >= data_sp->GetByteSize()) { 908 data_sp = MapFileData(file, header_and_load_cmds, file_offset); 909 data.SetData(data_sp); 910 data_offset = MachHeaderSizeFromMagic(header.magic); 911 } 912 if (data_sp) { 913 ModuleSpec spec; 914 spec.GetFileSpec() = file; 915 spec.SetObjectOffset(file_offset); 916 spec.SetObjectSize(length); 917 918 if (GetArchitecture(header, data, data_offset, 919 spec.GetArchitecture())) { 920 if (spec.GetArchitecture().IsValid()) { 921 GetUUID(header, data, data_offset, spec.GetUUID()); 922 specs.Append(spec); 923 } 924 } 925 } 926 } 927 } 928 return specs.GetSize() - initial_count; 929 } 930 931 const ConstString &ObjectFileMachO::GetSegmentNameTEXT() { 932 static ConstString g_segment_name_TEXT("__TEXT"); 933 return g_segment_name_TEXT; 934 } 935 936 const ConstString &ObjectFileMachO::GetSegmentNameDATA() { 937 static ConstString g_segment_name_DATA("__DATA"); 938 return g_segment_name_DATA; 939 } 940 941 const ConstString &ObjectFileMachO::GetSegmentNameDATA_DIRTY() { 942 static ConstString g_segment_name("__DATA_DIRTY"); 943 return g_segment_name; 944 } 945 946 const ConstString &ObjectFileMachO::GetSegmentNameDATA_CONST() { 947 static ConstString g_segment_name("__DATA_CONST"); 948 return g_segment_name; 949 } 950 951 const ConstString &ObjectFileMachO::GetSegmentNameOBJC() { 952 static ConstString g_segment_name_OBJC("__OBJC"); 953 return g_segment_name_OBJC; 954 } 955 956 const ConstString &ObjectFileMachO::GetSegmentNameLINKEDIT() { 957 static ConstString g_section_name_LINKEDIT("__LINKEDIT"); 958 return g_section_name_LINKEDIT; 959 } 960 961 const ConstString &ObjectFileMachO::GetSectionNameEHFrame() { 962 static ConstString g_section_name_eh_frame("__eh_frame"); 963 return g_section_name_eh_frame; 964 } 965 966 bool ObjectFileMachO::MagicBytesMatch(DataBufferSP &data_sp, 967 lldb::addr_t data_offset, 968 lldb::addr_t data_length) { 969 DataExtractor data; 970 data.SetData(data_sp, data_offset, data_length); 971 lldb::offset_t offset = 0; 972 uint32_t magic = data.GetU32(&offset); 973 return MachHeaderSizeFromMagic(magic) != 0; 974 } 975 976 ObjectFileMachO::ObjectFileMachO(const lldb::ModuleSP &module_sp, 977 DataBufferSP &data_sp, 978 lldb::offset_t data_offset, 979 const FileSpec *file, 980 lldb::offset_t file_offset, 981 lldb::offset_t length) 982 : ObjectFile(module_sp, file, file_offset, length, data_sp, data_offset), 983 m_mach_segments(), m_mach_sections(), m_entry_point_address(), 984 m_thread_context_offsets(), m_thread_context_offsets_valid(false), 985 m_reexported_dylibs(), m_allow_assembly_emulation_unwind_plans(true) { 986 ::memset(&m_header, 0, sizeof(m_header)); 987 ::memset(&m_dysymtab, 0, sizeof(m_dysymtab)); 988 } 989 990 ObjectFileMachO::ObjectFileMachO(const lldb::ModuleSP &module_sp, 991 lldb::DataBufferSP &header_data_sp, 992 const lldb::ProcessSP &process_sp, 993 lldb::addr_t header_addr) 994 : ObjectFile(module_sp, process_sp, header_addr, header_data_sp), 995 m_mach_segments(), m_mach_sections(), m_entry_point_address(), 996 m_thread_context_offsets(), m_thread_context_offsets_valid(false), 997 m_reexported_dylibs(), m_allow_assembly_emulation_unwind_plans(true) { 998 ::memset(&m_header, 0, sizeof(m_header)); 999 ::memset(&m_dysymtab, 0, sizeof(m_dysymtab)); 1000 } 1001 1002 bool ObjectFileMachO::ParseHeader(DataExtractor &data, 1003 lldb::offset_t *data_offset_ptr, 1004 llvm::MachO::mach_header &header) { 1005 data.SetByteOrder(endian::InlHostByteOrder()); 1006 // Leave magic in the original byte order 1007 header.magic = data.GetU32(data_offset_ptr); 1008 bool can_parse = false; 1009 bool is_64_bit = false; 1010 switch (header.magic) { 1011 case MH_MAGIC: 1012 data.SetByteOrder(endian::InlHostByteOrder()); 1013 data.SetAddressByteSize(4); 1014 can_parse = true; 1015 break; 1016 1017 case MH_MAGIC_64: 1018 data.SetByteOrder(endian::InlHostByteOrder()); 1019 data.SetAddressByteSize(8); 1020 can_parse = true; 1021 is_64_bit = true; 1022 break; 1023 1024 case MH_CIGAM: 1025 data.SetByteOrder(endian::InlHostByteOrder() == eByteOrderBig 1026 ? eByteOrderLittle 1027 : eByteOrderBig); 1028 data.SetAddressByteSize(4); 1029 can_parse = true; 1030 break; 1031 1032 case MH_CIGAM_64: 1033 data.SetByteOrder(endian::InlHostByteOrder() == eByteOrderBig 1034 ? eByteOrderLittle 1035 : eByteOrderBig); 1036 data.SetAddressByteSize(8); 1037 is_64_bit = true; 1038 can_parse = true; 1039 break; 1040 1041 default: 1042 break; 1043 } 1044 1045 if (can_parse) { 1046 data.GetU32(data_offset_ptr, &header.cputype, 6); 1047 if (is_64_bit) 1048 *data_offset_ptr += 4; 1049 return true; 1050 } else { 1051 memset(&header, 0, sizeof(header)); 1052 } 1053 return false; 1054 } 1055 1056 bool ObjectFileMachO::ParseHeader() { 1057 ModuleSP module_sp(GetModule()); 1058 if (module_sp) { 1059 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 1060 bool can_parse = false; 1061 lldb::offset_t offset = 0; 1062 m_data.SetByteOrder(endian::InlHostByteOrder()); 1063 // Leave magic in the original byte order 1064 m_header.magic = m_data.GetU32(&offset); 1065 switch (m_header.magic) { 1066 case MH_MAGIC: 1067 m_data.SetByteOrder(endian::InlHostByteOrder()); 1068 m_data.SetAddressByteSize(4); 1069 can_parse = true; 1070 break; 1071 1072 case MH_MAGIC_64: 1073 m_data.SetByteOrder(endian::InlHostByteOrder()); 1074 m_data.SetAddressByteSize(8); 1075 can_parse = true; 1076 break; 1077 1078 case MH_CIGAM: 1079 m_data.SetByteOrder(endian::InlHostByteOrder() == eByteOrderBig 1080 ? eByteOrderLittle 1081 : eByteOrderBig); 1082 m_data.SetAddressByteSize(4); 1083 can_parse = true; 1084 break; 1085 1086 case MH_CIGAM_64: 1087 m_data.SetByteOrder(endian::InlHostByteOrder() == eByteOrderBig 1088 ? eByteOrderLittle 1089 : eByteOrderBig); 1090 m_data.SetAddressByteSize(8); 1091 can_parse = true; 1092 break; 1093 1094 default: 1095 break; 1096 } 1097 1098 if (can_parse) { 1099 m_data.GetU32(&offset, &m_header.cputype, 6); 1100 1101 ArchSpec mach_arch; 1102 1103 if (GetArchitecture(mach_arch)) { 1104 // Check if the module has a required architecture 1105 const ArchSpec &module_arch = module_sp->GetArchitecture(); 1106 if (module_arch.IsValid() && !module_arch.IsCompatibleMatch(mach_arch)) 1107 return false; 1108 1109 if (SetModulesArchitecture(mach_arch)) { 1110 const size_t header_and_lc_size = 1111 m_header.sizeofcmds + MachHeaderSizeFromMagic(m_header.magic); 1112 if (m_data.GetByteSize() < header_and_lc_size) { 1113 DataBufferSP data_sp; 1114 ProcessSP process_sp(m_process_wp.lock()); 1115 if (process_sp) { 1116 data_sp = 1117 ReadMemory(process_sp, m_memory_addr, header_and_lc_size); 1118 } else { 1119 // Read in all only the load command data from the file on disk 1120 data_sp = MapFileData(m_file, header_and_lc_size, m_file_offset); 1121 if (data_sp->GetByteSize() != header_and_lc_size) 1122 return false; 1123 } 1124 if (data_sp) 1125 m_data.SetData(data_sp); 1126 } 1127 } 1128 return true; 1129 } 1130 } else { 1131 memset(&m_header, 0, sizeof(struct mach_header)); 1132 } 1133 } 1134 return false; 1135 } 1136 1137 ByteOrder ObjectFileMachO::GetByteOrder() const { 1138 return m_data.GetByteOrder(); 1139 } 1140 1141 bool ObjectFileMachO::IsExecutable() const { 1142 return m_header.filetype == MH_EXECUTE; 1143 } 1144 1145 uint32_t ObjectFileMachO::GetAddressByteSize() const { 1146 return m_data.GetAddressByteSize(); 1147 } 1148 1149 AddressClass ObjectFileMachO::GetAddressClass(lldb::addr_t file_addr) { 1150 Symtab *symtab = GetSymtab(); 1151 if (symtab) { 1152 Symbol *symbol = symtab->FindSymbolContainingFileAddress(file_addr); 1153 if (symbol) { 1154 if (symbol->ValueIsAddress()) { 1155 SectionSP section_sp(symbol->GetAddressRef().GetSection()); 1156 if (section_sp) { 1157 const lldb::SectionType section_type = section_sp->GetType(); 1158 switch (section_type) { 1159 case eSectionTypeInvalid: 1160 return AddressClass::eUnknown; 1161 1162 case eSectionTypeCode: 1163 if (m_header.cputype == llvm::MachO::CPU_TYPE_ARM) { 1164 // For ARM we have a bit in the n_desc field of the symbol that 1165 // tells us ARM/Thumb which is bit 0x0008. 1166 if (symbol->GetFlags() & MACHO_NLIST_ARM_SYMBOL_IS_THUMB) 1167 return AddressClass::eCodeAlternateISA; 1168 } 1169 return AddressClass::eCode; 1170 1171 case eSectionTypeContainer: 1172 return AddressClass::eUnknown; 1173 1174 case eSectionTypeData: 1175 case eSectionTypeDataCString: 1176 case eSectionTypeDataCStringPointers: 1177 case eSectionTypeDataSymbolAddress: 1178 case eSectionTypeData4: 1179 case eSectionTypeData8: 1180 case eSectionTypeData16: 1181 case eSectionTypeDataPointers: 1182 case eSectionTypeZeroFill: 1183 case eSectionTypeDataObjCMessageRefs: 1184 case eSectionTypeDataObjCCFStrings: 1185 case eSectionTypeGoSymtab: 1186 return AddressClass::eData; 1187 1188 case eSectionTypeDebug: 1189 case eSectionTypeDWARFDebugAbbrev: 1190 case eSectionTypeDWARFDebugAbbrevDwo: 1191 case eSectionTypeDWARFDebugAddr: 1192 case eSectionTypeDWARFDebugAranges: 1193 case eSectionTypeDWARFDebugCuIndex: 1194 case eSectionTypeDWARFDebugFrame: 1195 case eSectionTypeDWARFDebugInfo: 1196 case eSectionTypeDWARFDebugInfoDwo: 1197 case eSectionTypeDWARFDebugLine: 1198 case eSectionTypeDWARFDebugLineStr: 1199 case eSectionTypeDWARFDebugLoc: 1200 case eSectionTypeDWARFDebugLocLists: 1201 case eSectionTypeDWARFDebugMacInfo: 1202 case eSectionTypeDWARFDebugMacro: 1203 case eSectionTypeDWARFDebugNames: 1204 case eSectionTypeDWARFDebugPubNames: 1205 case eSectionTypeDWARFDebugPubTypes: 1206 case eSectionTypeDWARFDebugRanges: 1207 case eSectionTypeDWARFDebugRngLists: 1208 case eSectionTypeDWARFDebugStr: 1209 case eSectionTypeDWARFDebugStrDwo: 1210 case eSectionTypeDWARFDebugStrOffsets: 1211 case eSectionTypeDWARFDebugStrOffsetsDwo: 1212 case eSectionTypeDWARFDebugTypes: 1213 case eSectionTypeDWARFAppleNames: 1214 case eSectionTypeDWARFAppleTypes: 1215 case eSectionTypeDWARFAppleNamespaces: 1216 case eSectionTypeDWARFAppleObjC: 1217 case eSectionTypeDWARFGNUDebugAltLink: 1218 return AddressClass::eDebug; 1219 1220 case eSectionTypeEHFrame: 1221 case eSectionTypeARMexidx: 1222 case eSectionTypeARMextab: 1223 case eSectionTypeCompactUnwind: 1224 return AddressClass::eRuntime; 1225 1226 case eSectionTypeAbsoluteAddress: 1227 case eSectionTypeELFSymbolTable: 1228 case eSectionTypeELFDynamicSymbols: 1229 case eSectionTypeELFRelocationEntries: 1230 case eSectionTypeELFDynamicLinkInfo: 1231 case eSectionTypeOther: 1232 return AddressClass::eUnknown; 1233 } 1234 } 1235 } 1236 1237 const SymbolType symbol_type = symbol->GetType(); 1238 switch (symbol_type) { 1239 case eSymbolTypeAny: 1240 return AddressClass::eUnknown; 1241 case eSymbolTypeAbsolute: 1242 return AddressClass::eUnknown; 1243 1244 case eSymbolTypeCode: 1245 case eSymbolTypeTrampoline: 1246 case eSymbolTypeResolver: 1247 if (m_header.cputype == llvm::MachO::CPU_TYPE_ARM) { 1248 // For ARM we have a bit in the n_desc field of the symbol that tells 1249 // us ARM/Thumb which is bit 0x0008. 1250 if (symbol->GetFlags() & MACHO_NLIST_ARM_SYMBOL_IS_THUMB) 1251 return AddressClass::eCodeAlternateISA; 1252 } 1253 return AddressClass::eCode; 1254 1255 case eSymbolTypeData: 1256 return AddressClass::eData; 1257 case eSymbolTypeRuntime: 1258 return AddressClass::eRuntime; 1259 case eSymbolTypeException: 1260 return AddressClass::eRuntime; 1261 case eSymbolTypeSourceFile: 1262 return AddressClass::eDebug; 1263 case eSymbolTypeHeaderFile: 1264 return AddressClass::eDebug; 1265 case eSymbolTypeObjectFile: 1266 return AddressClass::eDebug; 1267 case eSymbolTypeCommonBlock: 1268 return AddressClass::eDebug; 1269 case eSymbolTypeBlock: 1270 return AddressClass::eDebug; 1271 case eSymbolTypeLocal: 1272 return AddressClass::eData; 1273 case eSymbolTypeParam: 1274 return AddressClass::eData; 1275 case eSymbolTypeVariable: 1276 return AddressClass::eData; 1277 case eSymbolTypeVariableType: 1278 return AddressClass::eDebug; 1279 case eSymbolTypeLineEntry: 1280 return AddressClass::eDebug; 1281 case eSymbolTypeLineHeader: 1282 return AddressClass::eDebug; 1283 case eSymbolTypeScopeBegin: 1284 return AddressClass::eDebug; 1285 case eSymbolTypeScopeEnd: 1286 return AddressClass::eDebug; 1287 case eSymbolTypeAdditional: 1288 return AddressClass::eUnknown; 1289 case eSymbolTypeCompiler: 1290 return AddressClass::eDebug; 1291 case eSymbolTypeInstrumentation: 1292 return AddressClass::eDebug; 1293 case eSymbolTypeUndefined: 1294 return AddressClass::eUnknown; 1295 case eSymbolTypeObjCClass: 1296 return AddressClass::eRuntime; 1297 case eSymbolTypeObjCMetaClass: 1298 return AddressClass::eRuntime; 1299 case eSymbolTypeObjCIVar: 1300 return AddressClass::eRuntime; 1301 case eSymbolTypeReExported: 1302 return AddressClass::eRuntime; 1303 } 1304 } 1305 } 1306 return AddressClass::eUnknown; 1307 } 1308 1309 Symtab *ObjectFileMachO::GetSymtab() { 1310 ModuleSP module_sp(GetModule()); 1311 if (module_sp) { 1312 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 1313 if (m_symtab_ap.get() == NULL) { 1314 m_symtab_ap.reset(new Symtab(this)); 1315 std::lock_guard<std::recursive_mutex> symtab_guard( 1316 m_symtab_ap->GetMutex()); 1317 ParseSymtab(); 1318 m_symtab_ap->Finalize(); 1319 } 1320 } 1321 return m_symtab_ap.get(); 1322 } 1323 1324 bool ObjectFileMachO::IsStripped() { 1325 if (m_dysymtab.cmd == 0) { 1326 ModuleSP module_sp(GetModule()); 1327 if (module_sp) { 1328 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 1329 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 1330 const lldb::offset_t load_cmd_offset = offset; 1331 1332 load_command lc; 1333 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 1334 break; 1335 if (lc.cmd == LC_DYSYMTAB) { 1336 m_dysymtab.cmd = lc.cmd; 1337 m_dysymtab.cmdsize = lc.cmdsize; 1338 if (m_data.GetU32(&offset, &m_dysymtab.ilocalsym, 1339 (sizeof(m_dysymtab) / sizeof(uint32_t)) - 2) == 1340 NULL) { 1341 // Clear m_dysymtab if we were unable to read all items from the 1342 // load command 1343 ::memset(&m_dysymtab, 0, sizeof(m_dysymtab)); 1344 } 1345 } 1346 offset = load_cmd_offset + lc.cmdsize; 1347 } 1348 } 1349 } 1350 if (m_dysymtab.cmd) 1351 return m_dysymtab.nlocalsym <= 1; 1352 return false; 1353 } 1354 1355 ObjectFileMachO::EncryptedFileRanges ObjectFileMachO::GetEncryptedFileRanges() { 1356 EncryptedFileRanges result; 1357 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 1358 1359 encryption_info_command encryption_cmd; 1360 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 1361 const lldb::offset_t load_cmd_offset = offset; 1362 if (m_data.GetU32(&offset, &encryption_cmd, 2) == NULL) 1363 break; 1364 1365 // LC_ENCRYPTION_INFO and LC_ENCRYPTION_INFO_64 have the same sizes for the 1366 // 3 fields we care about, so treat them the same. 1367 if (encryption_cmd.cmd == LC_ENCRYPTION_INFO || 1368 encryption_cmd.cmd == LC_ENCRYPTION_INFO_64) { 1369 if (m_data.GetU32(&offset, &encryption_cmd.cryptoff, 3)) { 1370 if (encryption_cmd.cryptid != 0) { 1371 EncryptedFileRanges::Entry entry; 1372 entry.SetRangeBase(encryption_cmd.cryptoff); 1373 entry.SetByteSize(encryption_cmd.cryptsize); 1374 result.Append(entry); 1375 } 1376 } 1377 } 1378 offset = load_cmd_offset + encryption_cmd.cmdsize; 1379 } 1380 1381 return result; 1382 } 1383 1384 void ObjectFileMachO::SanitizeSegmentCommand(segment_command_64 &seg_cmd, 1385 uint32_t cmd_idx) { 1386 if (m_length == 0 || seg_cmd.filesize == 0) 1387 return; 1388 1389 if (seg_cmd.fileoff > m_length) { 1390 // We have a load command that says it extends past the end of the file. 1391 // This is likely a corrupt file. We don't have any way to return an error 1392 // condition here (this method was likely invoked from something like 1393 // ObjectFile::GetSectionList()), so we just null out the section contents, 1394 // and dump a message to stdout. The most common case here is core file 1395 // debugging with a truncated file. 1396 const char *lc_segment_name = 1397 seg_cmd.cmd == LC_SEGMENT_64 ? "LC_SEGMENT_64" : "LC_SEGMENT"; 1398 GetModule()->ReportWarning( 1399 "load command %u %s has a fileoff (0x%" PRIx64 1400 ") that extends beyond the end of the file (0x%" PRIx64 1401 "), ignoring this section", 1402 cmd_idx, lc_segment_name, seg_cmd.fileoff, m_length); 1403 1404 seg_cmd.fileoff = 0; 1405 seg_cmd.filesize = 0; 1406 } 1407 1408 if (seg_cmd.fileoff + seg_cmd.filesize > m_length) { 1409 // We have a load command that says it extends past the end of the file. 1410 // This is likely a corrupt file. We don't have any way to return an error 1411 // condition here (this method was likely invoked from something like 1412 // ObjectFile::GetSectionList()), so we just null out the section contents, 1413 // and dump a message to stdout. The most common case here is core file 1414 // debugging with a truncated file. 1415 const char *lc_segment_name = 1416 seg_cmd.cmd == LC_SEGMENT_64 ? "LC_SEGMENT_64" : "LC_SEGMENT"; 1417 GetModule()->ReportWarning( 1418 "load command %u %s has a fileoff + filesize (0x%" PRIx64 1419 ") that extends beyond the end of the file (0x%" PRIx64 1420 "), the segment will be truncated to match", 1421 cmd_idx, lc_segment_name, seg_cmd.fileoff + seg_cmd.filesize, m_length); 1422 1423 // Truncate the length 1424 seg_cmd.filesize = m_length - seg_cmd.fileoff; 1425 } 1426 } 1427 1428 static uint32_t GetSegmentPermissions(const segment_command_64 &seg_cmd) { 1429 uint32_t result = 0; 1430 if (seg_cmd.initprot & VM_PROT_READ) 1431 result |= ePermissionsReadable; 1432 if (seg_cmd.initprot & VM_PROT_WRITE) 1433 result |= ePermissionsWritable; 1434 if (seg_cmd.initprot & VM_PROT_EXECUTE) 1435 result |= ePermissionsExecutable; 1436 return result; 1437 } 1438 1439 static lldb::SectionType GetSectionType(uint32_t flags, 1440 ConstString section_name) { 1441 1442 if (flags & (S_ATTR_PURE_INSTRUCTIONS | S_ATTR_SOME_INSTRUCTIONS)) 1443 return eSectionTypeCode; 1444 1445 uint32_t mach_sect_type = flags & SECTION_TYPE; 1446 static ConstString g_sect_name_objc_data("__objc_data"); 1447 static ConstString g_sect_name_objc_msgrefs("__objc_msgrefs"); 1448 static ConstString g_sect_name_objc_selrefs("__objc_selrefs"); 1449 static ConstString g_sect_name_objc_classrefs("__objc_classrefs"); 1450 static ConstString g_sect_name_objc_superrefs("__objc_superrefs"); 1451 static ConstString g_sect_name_objc_const("__objc_const"); 1452 static ConstString g_sect_name_objc_classlist("__objc_classlist"); 1453 static ConstString g_sect_name_cfstring("__cfstring"); 1454 1455 static ConstString g_sect_name_dwarf_debug_abbrev("__debug_abbrev"); 1456 static ConstString g_sect_name_dwarf_debug_aranges("__debug_aranges"); 1457 static ConstString g_sect_name_dwarf_debug_frame("__debug_frame"); 1458 static ConstString g_sect_name_dwarf_debug_info("__debug_info"); 1459 static ConstString g_sect_name_dwarf_debug_line("__debug_line"); 1460 static ConstString g_sect_name_dwarf_debug_loc("__debug_loc"); 1461 static ConstString g_sect_name_dwarf_debug_loclists("__debug_loclists"); 1462 static ConstString g_sect_name_dwarf_debug_macinfo("__debug_macinfo"); 1463 static ConstString g_sect_name_dwarf_debug_names("__debug_names"); 1464 static ConstString g_sect_name_dwarf_debug_pubnames("__debug_pubnames"); 1465 static ConstString g_sect_name_dwarf_debug_pubtypes("__debug_pubtypes"); 1466 static ConstString g_sect_name_dwarf_debug_ranges("__debug_ranges"); 1467 static ConstString g_sect_name_dwarf_debug_str("__debug_str"); 1468 static ConstString g_sect_name_dwarf_debug_types("__debug_types"); 1469 static ConstString g_sect_name_dwarf_apple_names("__apple_names"); 1470 static ConstString g_sect_name_dwarf_apple_types("__apple_types"); 1471 static ConstString g_sect_name_dwarf_apple_namespaces("__apple_namespac"); 1472 static ConstString g_sect_name_dwarf_apple_objc("__apple_objc"); 1473 static ConstString g_sect_name_eh_frame("__eh_frame"); 1474 static ConstString g_sect_name_compact_unwind("__unwind_info"); 1475 static ConstString g_sect_name_text("__text"); 1476 static ConstString g_sect_name_data("__data"); 1477 static ConstString g_sect_name_go_symtab("__gosymtab"); 1478 1479 if (section_name == g_sect_name_dwarf_debug_abbrev) 1480 return eSectionTypeDWARFDebugAbbrev; 1481 if (section_name == g_sect_name_dwarf_debug_aranges) 1482 return eSectionTypeDWARFDebugAranges; 1483 if (section_name == g_sect_name_dwarf_debug_frame) 1484 return eSectionTypeDWARFDebugFrame; 1485 if (section_name == g_sect_name_dwarf_debug_info) 1486 return eSectionTypeDWARFDebugInfo; 1487 if (section_name == g_sect_name_dwarf_debug_line) 1488 return eSectionTypeDWARFDebugLine; 1489 if (section_name == g_sect_name_dwarf_debug_loc) 1490 return eSectionTypeDWARFDebugLoc; 1491 if (section_name == g_sect_name_dwarf_debug_loclists) 1492 return eSectionTypeDWARFDebugLocLists; 1493 if (section_name == g_sect_name_dwarf_debug_macinfo) 1494 return eSectionTypeDWARFDebugMacInfo; 1495 if (section_name == g_sect_name_dwarf_debug_names) 1496 return eSectionTypeDWARFDebugNames; 1497 if (section_name == g_sect_name_dwarf_debug_pubnames) 1498 return eSectionTypeDWARFDebugPubNames; 1499 if (section_name == g_sect_name_dwarf_debug_pubtypes) 1500 return eSectionTypeDWARFDebugPubTypes; 1501 if (section_name == g_sect_name_dwarf_debug_ranges) 1502 return eSectionTypeDWARFDebugRanges; 1503 if (section_name == g_sect_name_dwarf_debug_str) 1504 return eSectionTypeDWARFDebugStr; 1505 if (section_name == g_sect_name_dwarf_debug_types) 1506 return eSectionTypeDWARFDebugTypes; 1507 if (section_name == g_sect_name_dwarf_apple_names) 1508 return eSectionTypeDWARFAppleNames; 1509 if (section_name == g_sect_name_dwarf_apple_types) 1510 return eSectionTypeDWARFAppleTypes; 1511 if (section_name == g_sect_name_dwarf_apple_namespaces) 1512 return eSectionTypeDWARFAppleNamespaces; 1513 if (section_name == g_sect_name_dwarf_apple_objc) 1514 return eSectionTypeDWARFAppleObjC; 1515 if (section_name == g_sect_name_objc_selrefs) 1516 return eSectionTypeDataCStringPointers; 1517 if (section_name == g_sect_name_objc_msgrefs) 1518 return eSectionTypeDataObjCMessageRefs; 1519 if (section_name == g_sect_name_eh_frame) 1520 return eSectionTypeEHFrame; 1521 if (section_name == g_sect_name_compact_unwind) 1522 return eSectionTypeCompactUnwind; 1523 if (section_name == g_sect_name_cfstring) 1524 return eSectionTypeDataObjCCFStrings; 1525 if (section_name == g_sect_name_go_symtab) 1526 return eSectionTypeGoSymtab; 1527 if (section_name == g_sect_name_objc_data || 1528 section_name == g_sect_name_objc_classrefs || 1529 section_name == g_sect_name_objc_superrefs || 1530 section_name == g_sect_name_objc_const || 1531 section_name == g_sect_name_objc_classlist) { 1532 return eSectionTypeDataPointers; 1533 } 1534 1535 switch (mach_sect_type) { 1536 // TODO: categorize sections by other flags for regular sections 1537 case S_REGULAR: 1538 if (section_name == g_sect_name_text) 1539 return eSectionTypeCode; 1540 if (section_name == g_sect_name_data) 1541 return eSectionTypeData; 1542 return eSectionTypeOther; 1543 case S_ZEROFILL: 1544 return eSectionTypeZeroFill; 1545 case S_CSTRING_LITERALS: // section with only literal C strings 1546 return eSectionTypeDataCString; 1547 case S_4BYTE_LITERALS: // section with only 4 byte literals 1548 return eSectionTypeData4; 1549 case S_8BYTE_LITERALS: // section with only 8 byte literals 1550 return eSectionTypeData8; 1551 case S_LITERAL_POINTERS: // section with only pointers to literals 1552 return eSectionTypeDataPointers; 1553 case S_NON_LAZY_SYMBOL_POINTERS: // section with only non-lazy symbol pointers 1554 return eSectionTypeDataPointers; 1555 case S_LAZY_SYMBOL_POINTERS: // section with only lazy symbol pointers 1556 return eSectionTypeDataPointers; 1557 case S_SYMBOL_STUBS: // section with only symbol stubs, byte size of stub in 1558 // the reserved2 field 1559 return eSectionTypeCode; 1560 case S_MOD_INIT_FUNC_POINTERS: // section with only function pointers for 1561 // initialization 1562 return eSectionTypeDataPointers; 1563 case S_MOD_TERM_FUNC_POINTERS: // section with only function pointers for 1564 // termination 1565 return eSectionTypeDataPointers; 1566 case S_COALESCED: 1567 return eSectionTypeOther; 1568 case S_GB_ZEROFILL: 1569 return eSectionTypeZeroFill; 1570 case S_INTERPOSING: // section with only pairs of function pointers for 1571 // interposing 1572 return eSectionTypeCode; 1573 case S_16BYTE_LITERALS: // section with only 16 byte literals 1574 return eSectionTypeData16; 1575 case S_DTRACE_DOF: 1576 return eSectionTypeDebug; 1577 case S_LAZY_DYLIB_SYMBOL_POINTERS: 1578 return eSectionTypeDataPointers; 1579 default: 1580 return eSectionTypeOther; 1581 } 1582 } 1583 1584 struct ObjectFileMachO::SegmentParsingContext { 1585 const EncryptedFileRanges EncryptedRanges; 1586 lldb_private::SectionList &UnifiedList; 1587 uint32_t NextSegmentIdx = 0; 1588 uint32_t NextSectionIdx = 0; 1589 bool FileAddressesChanged = false; 1590 1591 SegmentParsingContext(EncryptedFileRanges EncryptedRanges, 1592 lldb_private::SectionList &UnifiedList) 1593 : EncryptedRanges(std::move(EncryptedRanges)), UnifiedList(UnifiedList) {} 1594 }; 1595 1596 void ObjectFileMachO::ProcessSegmentCommand(const load_command &load_cmd_, 1597 lldb::offset_t offset, 1598 uint32_t cmd_idx, 1599 SegmentParsingContext &context) { 1600 segment_command_64 load_cmd; 1601 memcpy(&load_cmd, &load_cmd_, sizeof(load_cmd_)); 1602 1603 if (!m_data.GetU8(&offset, (uint8_t *)load_cmd.segname, 16)) 1604 return; 1605 1606 ModuleSP module_sp = GetModule(); 1607 const bool is_core = GetType() == eTypeCoreFile; 1608 const bool is_dsym = (m_header.filetype == MH_DSYM); 1609 bool add_section = true; 1610 bool add_to_unified = true; 1611 ConstString const_segname( 1612 load_cmd.segname, 1613 std::min<size_t>(strlen(load_cmd.segname), sizeof(load_cmd.segname))); 1614 1615 SectionSP unified_section_sp( 1616 context.UnifiedList.FindSectionByName(const_segname)); 1617 if (is_dsym && unified_section_sp) { 1618 if (const_segname == GetSegmentNameLINKEDIT()) { 1619 // We need to keep the __LINKEDIT segment private to this object file 1620 // only 1621 add_to_unified = false; 1622 } else { 1623 // This is the dSYM file and this section has already been created by the 1624 // object file, no need to create it. 1625 add_section = false; 1626 } 1627 } 1628 load_cmd.vmaddr = m_data.GetAddress(&offset); 1629 load_cmd.vmsize = m_data.GetAddress(&offset); 1630 load_cmd.fileoff = m_data.GetAddress(&offset); 1631 load_cmd.filesize = m_data.GetAddress(&offset); 1632 if (!m_data.GetU32(&offset, &load_cmd.maxprot, 4)) 1633 return; 1634 1635 SanitizeSegmentCommand(load_cmd, cmd_idx); 1636 1637 const uint32_t segment_permissions = GetSegmentPermissions(load_cmd); 1638 const bool segment_is_encrypted = 1639 (load_cmd.flags & SG_PROTECTED_VERSION_1) != 0; 1640 1641 // Keep a list of mach segments around in case we need to get at data that 1642 // isn't stored in the abstracted Sections. 1643 m_mach_segments.push_back(load_cmd); 1644 1645 // Use a segment ID of the segment index shifted left by 8 so they never 1646 // conflict with any of the sections. 1647 SectionSP segment_sp; 1648 if (add_section && (const_segname || is_core)) { 1649 segment_sp.reset(new Section( 1650 module_sp, // Module to which this section belongs 1651 this, // Object file to which this sections belongs 1652 ++context.NextSegmentIdx 1653 << 8, // Section ID is the 1 based segment index 1654 // shifted right by 8 bits as not to collide with any of the 256 1655 // section IDs that are possible 1656 const_segname, // Name of this section 1657 eSectionTypeContainer, // This section is a container of other 1658 // sections. 1659 load_cmd.vmaddr, // File VM address == addresses as they are 1660 // found in the object file 1661 load_cmd.vmsize, // VM size in bytes of this section 1662 load_cmd.fileoff, // Offset to the data for this section in 1663 // the file 1664 load_cmd.filesize, // Size in bytes of this section as found 1665 // in the file 1666 0, // Segments have no alignment information 1667 load_cmd.flags)); // Flags for this section 1668 1669 segment_sp->SetIsEncrypted(segment_is_encrypted); 1670 m_sections_ap->AddSection(segment_sp); 1671 segment_sp->SetPermissions(segment_permissions); 1672 if (add_to_unified) 1673 context.UnifiedList.AddSection(segment_sp); 1674 } else if (unified_section_sp) { 1675 if (is_dsym && unified_section_sp->GetFileAddress() != load_cmd.vmaddr) { 1676 // Check to see if the module was read from memory? 1677 if (module_sp->GetObjectFile()->GetBaseAddress().IsValid()) { 1678 // We have a module that is in memory and needs to have its file 1679 // address adjusted. We need to do this because when we load a file 1680 // from memory, its addresses will be slid already, yet the addresses 1681 // in the new symbol file will still be unslid. Since everything is 1682 // stored as section offset, this shouldn't cause any problems. 1683 1684 // Make sure we've parsed the symbol table from the ObjectFile before 1685 // we go around changing its Sections. 1686 module_sp->GetObjectFile()->GetSymtab(); 1687 // eh_frame would present the same problems but we parse that on a per- 1688 // function basis as-needed so it's more difficult to remove its use of 1689 // the Sections. Realistically, the environments where this code path 1690 // will be taken will not have eh_frame sections. 1691 1692 unified_section_sp->SetFileAddress(load_cmd.vmaddr); 1693 1694 // Notify the module that the section addresses have been changed once 1695 // we're done so any file-address caches can be updated. 1696 context.FileAddressesChanged = true; 1697 } 1698 } 1699 m_sections_ap->AddSection(unified_section_sp); 1700 } 1701 1702 struct section_64 sect64; 1703 ::memset(§64, 0, sizeof(sect64)); 1704 // Push a section into our mach sections for the section at index zero 1705 // (NO_SECT) if we don't have any mach sections yet... 1706 if (m_mach_sections.empty()) 1707 m_mach_sections.push_back(sect64); 1708 uint32_t segment_sect_idx; 1709 const lldb::user_id_t first_segment_sectID = context.NextSectionIdx + 1; 1710 1711 const uint32_t num_u32s = load_cmd.cmd == LC_SEGMENT ? 7 : 8; 1712 for (segment_sect_idx = 0; segment_sect_idx < load_cmd.nsects; 1713 ++segment_sect_idx) { 1714 if (m_data.GetU8(&offset, (uint8_t *)sect64.sectname, 1715 sizeof(sect64.sectname)) == NULL) 1716 break; 1717 if (m_data.GetU8(&offset, (uint8_t *)sect64.segname, 1718 sizeof(sect64.segname)) == NULL) 1719 break; 1720 sect64.addr = m_data.GetAddress(&offset); 1721 sect64.size = m_data.GetAddress(&offset); 1722 1723 if (m_data.GetU32(&offset, §64.offset, num_u32s) == NULL) 1724 break; 1725 1726 // Keep a list of mach sections around in case we need to get at data that 1727 // isn't stored in the abstracted Sections. 1728 m_mach_sections.push_back(sect64); 1729 1730 if (add_section) { 1731 ConstString section_name( 1732 sect64.sectname, 1733 std::min<size_t>(strlen(sect64.sectname), sizeof(sect64.sectname))); 1734 if (!const_segname) { 1735 // We have a segment with no name so we need to conjure up segments 1736 // that correspond to the section's segname if there isn't already such 1737 // a section. If there is such a section, we resize the section so that 1738 // it spans all sections. We also mark these sections as fake so 1739 // address matches don't hit if they land in the gaps between the child 1740 // sections. 1741 const_segname.SetTrimmedCStringWithLength(sect64.segname, 1742 sizeof(sect64.segname)); 1743 segment_sp = context.UnifiedList.FindSectionByName(const_segname); 1744 if (segment_sp.get()) { 1745 Section *segment = segment_sp.get(); 1746 // Grow the section size as needed. 1747 const lldb::addr_t sect64_min_addr = sect64.addr; 1748 const lldb::addr_t sect64_max_addr = sect64_min_addr + sect64.size; 1749 const lldb::addr_t curr_seg_byte_size = segment->GetByteSize(); 1750 const lldb::addr_t curr_seg_min_addr = segment->GetFileAddress(); 1751 const lldb::addr_t curr_seg_max_addr = 1752 curr_seg_min_addr + curr_seg_byte_size; 1753 if (sect64_min_addr >= curr_seg_min_addr) { 1754 const lldb::addr_t new_seg_byte_size = 1755 sect64_max_addr - curr_seg_min_addr; 1756 // Only grow the section size if needed 1757 if (new_seg_byte_size > curr_seg_byte_size) 1758 segment->SetByteSize(new_seg_byte_size); 1759 } else { 1760 // We need to change the base address of the segment and adjust the 1761 // child section offsets for all existing children. 1762 const lldb::addr_t slide_amount = 1763 sect64_min_addr - curr_seg_min_addr; 1764 segment->Slide(slide_amount, false); 1765 segment->GetChildren().Slide(-slide_amount, false); 1766 segment->SetByteSize(curr_seg_max_addr - sect64_min_addr); 1767 } 1768 1769 // Grow the section size as needed. 1770 if (sect64.offset) { 1771 const lldb::addr_t segment_min_file_offset = 1772 segment->GetFileOffset(); 1773 const lldb::addr_t segment_max_file_offset = 1774 segment_min_file_offset + segment->GetFileSize(); 1775 1776 const lldb::addr_t section_min_file_offset = sect64.offset; 1777 const lldb::addr_t section_max_file_offset = 1778 section_min_file_offset + sect64.size; 1779 const lldb::addr_t new_file_offset = 1780 std::min(section_min_file_offset, segment_min_file_offset); 1781 const lldb::addr_t new_file_size = 1782 std::max(section_max_file_offset, segment_max_file_offset) - 1783 new_file_offset; 1784 segment->SetFileOffset(new_file_offset); 1785 segment->SetFileSize(new_file_size); 1786 } 1787 } else { 1788 // Create a fake section for the section's named segment 1789 segment_sp.reset(new Section( 1790 segment_sp, // Parent section 1791 module_sp, // Module to which this section belongs 1792 this, // Object file to which this section belongs 1793 ++context.NextSegmentIdx 1794 << 8, // Section ID is the 1 based segment index 1795 // shifted right by 8 bits as not to 1796 // collide with any of the 256 section IDs 1797 // that are possible 1798 const_segname, // Name of this section 1799 eSectionTypeContainer, // This section is a container of 1800 // other sections. 1801 sect64.addr, // File VM address == addresses as they are 1802 // found in the object file 1803 sect64.size, // VM size in bytes of this section 1804 sect64.offset, // Offset to the data for this section in 1805 // the file 1806 sect64.offset ? sect64.size : 0, // Size in bytes of 1807 // this section as 1808 // found in the file 1809 sect64.align, 1810 load_cmd.flags)); // Flags for this section 1811 segment_sp->SetIsFake(true); 1812 segment_sp->SetPermissions(segment_permissions); 1813 m_sections_ap->AddSection(segment_sp); 1814 if (add_to_unified) 1815 context.UnifiedList.AddSection(segment_sp); 1816 segment_sp->SetIsEncrypted(segment_is_encrypted); 1817 } 1818 } 1819 assert(segment_sp.get()); 1820 1821 lldb::SectionType sect_type = GetSectionType(sect64.flags, section_name); 1822 1823 SectionSP section_sp(new Section( 1824 segment_sp, module_sp, this, ++context.NextSectionIdx, section_name, 1825 sect_type, sect64.addr - segment_sp->GetFileAddress(), sect64.size, 1826 sect64.offset, sect64.offset == 0 ? 0 : sect64.size, sect64.align, 1827 sect64.flags)); 1828 // Set the section to be encrypted to match the segment 1829 1830 bool section_is_encrypted = false; 1831 if (!segment_is_encrypted && load_cmd.filesize != 0) 1832 section_is_encrypted = context.EncryptedRanges.FindEntryThatContains( 1833 sect64.offset) != NULL; 1834 1835 section_sp->SetIsEncrypted(segment_is_encrypted || section_is_encrypted); 1836 section_sp->SetPermissions(segment_permissions); 1837 segment_sp->GetChildren().AddSection(section_sp); 1838 1839 if (segment_sp->IsFake()) { 1840 segment_sp.reset(); 1841 const_segname.Clear(); 1842 } 1843 } 1844 } 1845 if (segment_sp && is_dsym) { 1846 if (first_segment_sectID <= context.NextSectionIdx) { 1847 lldb::user_id_t sect_uid; 1848 for (sect_uid = first_segment_sectID; sect_uid <= context.NextSectionIdx; 1849 ++sect_uid) { 1850 SectionSP curr_section_sp( 1851 segment_sp->GetChildren().FindSectionByID(sect_uid)); 1852 SectionSP next_section_sp; 1853 if (sect_uid + 1 <= context.NextSectionIdx) 1854 next_section_sp = 1855 segment_sp->GetChildren().FindSectionByID(sect_uid + 1); 1856 1857 if (curr_section_sp.get()) { 1858 if (curr_section_sp->GetByteSize() == 0) { 1859 if (next_section_sp.get() != NULL) 1860 curr_section_sp->SetByteSize(next_section_sp->GetFileAddress() - 1861 curr_section_sp->GetFileAddress()); 1862 else 1863 curr_section_sp->SetByteSize(load_cmd.vmsize); 1864 } 1865 } 1866 } 1867 } 1868 } 1869 } 1870 1871 void ObjectFileMachO::ProcessDysymtabCommand(const load_command &load_cmd, 1872 lldb::offset_t offset) { 1873 m_dysymtab.cmd = load_cmd.cmd; 1874 m_dysymtab.cmdsize = load_cmd.cmdsize; 1875 m_data.GetU32(&offset, &m_dysymtab.ilocalsym, 1876 (sizeof(m_dysymtab) / sizeof(uint32_t)) - 2); 1877 } 1878 1879 void ObjectFileMachO::CreateSections(SectionList &unified_section_list) { 1880 if (m_sections_ap) 1881 return; 1882 1883 m_sections_ap.reset(new SectionList()); 1884 1885 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 1886 // bool dump_sections = false; 1887 ModuleSP module_sp(GetModule()); 1888 1889 offset = MachHeaderSizeFromMagic(m_header.magic); 1890 1891 SegmentParsingContext context(GetEncryptedFileRanges(), unified_section_list); 1892 struct load_command load_cmd; 1893 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 1894 const lldb::offset_t load_cmd_offset = offset; 1895 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 1896 break; 1897 1898 if (load_cmd.cmd == LC_SEGMENT || load_cmd.cmd == LC_SEGMENT_64) 1899 ProcessSegmentCommand(load_cmd, offset, i, context); 1900 else if (load_cmd.cmd == LC_DYSYMTAB) 1901 ProcessDysymtabCommand(load_cmd, offset); 1902 1903 offset = load_cmd_offset + load_cmd.cmdsize; 1904 } 1905 1906 if (context.FileAddressesChanged && module_sp) 1907 module_sp->SectionFileAddressesChanged(); 1908 } 1909 1910 class MachSymtabSectionInfo { 1911 public: 1912 MachSymtabSectionInfo(SectionList *section_list) 1913 : m_section_list(section_list), m_section_infos() { 1914 // Get the number of sections down to a depth of 1 to include all segments 1915 // and their sections, but no other sections that may be added for debug 1916 // map or 1917 m_section_infos.resize(section_list->GetNumSections(1)); 1918 } 1919 1920 SectionSP GetSection(uint8_t n_sect, addr_t file_addr) { 1921 if (n_sect == 0) 1922 return SectionSP(); 1923 if (n_sect < m_section_infos.size()) { 1924 if (!m_section_infos[n_sect].section_sp) { 1925 SectionSP section_sp(m_section_list->FindSectionByID(n_sect)); 1926 m_section_infos[n_sect].section_sp = section_sp; 1927 if (section_sp) { 1928 m_section_infos[n_sect].vm_range.SetBaseAddress( 1929 section_sp->GetFileAddress()); 1930 m_section_infos[n_sect].vm_range.SetByteSize( 1931 section_sp->GetByteSize()); 1932 } else { 1933 Host::SystemLog(Host::eSystemLogError, 1934 "error: unable to find section for section %u\n", 1935 n_sect); 1936 } 1937 } 1938 if (m_section_infos[n_sect].vm_range.Contains(file_addr)) { 1939 // Symbol is in section. 1940 return m_section_infos[n_sect].section_sp; 1941 } else if (m_section_infos[n_sect].vm_range.GetByteSize() == 0 && 1942 m_section_infos[n_sect].vm_range.GetBaseAddress() == 1943 file_addr) { 1944 // Symbol is in section with zero size, but has the same start address 1945 // as the section. This can happen with linker symbols (symbols that 1946 // start with the letter 'l' or 'L'. 1947 return m_section_infos[n_sect].section_sp; 1948 } 1949 } 1950 return m_section_list->FindSectionContainingFileAddress(file_addr); 1951 } 1952 1953 protected: 1954 struct SectionInfo { 1955 SectionInfo() : vm_range(), section_sp() {} 1956 1957 VMRange vm_range; 1958 SectionSP section_sp; 1959 }; 1960 SectionList *m_section_list; 1961 std::vector<SectionInfo> m_section_infos; 1962 }; 1963 1964 struct TrieEntry { 1965 TrieEntry() 1966 : name(), address(LLDB_INVALID_ADDRESS), flags(0), other(0), 1967 import_name() {} 1968 1969 void Clear() { 1970 name.Clear(); 1971 address = LLDB_INVALID_ADDRESS; 1972 flags = 0; 1973 other = 0; 1974 import_name.Clear(); 1975 } 1976 1977 void Dump() const { 1978 printf("0x%16.16llx 0x%16.16llx 0x%16.16llx \"%s\"", 1979 static_cast<unsigned long long>(address), 1980 static_cast<unsigned long long>(flags), 1981 static_cast<unsigned long long>(other), name.GetCString()); 1982 if (import_name) 1983 printf(" -> \"%s\"\n", import_name.GetCString()); 1984 else 1985 printf("\n"); 1986 } 1987 ConstString name; 1988 uint64_t address; 1989 uint64_t flags; 1990 uint64_t other; 1991 ConstString import_name; 1992 }; 1993 1994 struct TrieEntryWithOffset { 1995 lldb::offset_t nodeOffset; 1996 TrieEntry entry; 1997 1998 TrieEntryWithOffset(lldb::offset_t offset) : nodeOffset(offset), entry() {} 1999 2000 void Dump(uint32_t idx) const { 2001 printf("[%3u] 0x%16.16llx: ", idx, 2002 static_cast<unsigned long long>(nodeOffset)); 2003 entry.Dump(); 2004 } 2005 2006 bool operator<(const TrieEntryWithOffset &other) const { 2007 return (nodeOffset < other.nodeOffset); 2008 } 2009 }; 2010 2011 static bool ParseTrieEntries(DataExtractor &data, lldb::offset_t offset, 2012 const bool is_arm, 2013 std::vector<llvm::StringRef> &nameSlices, 2014 std::set<lldb::addr_t> &resolver_addresses, 2015 std::vector<TrieEntryWithOffset> &output) { 2016 if (!data.ValidOffset(offset)) 2017 return true; 2018 2019 const uint64_t terminalSize = data.GetULEB128(&offset); 2020 lldb::offset_t children_offset = offset + terminalSize; 2021 if (terminalSize != 0) { 2022 TrieEntryWithOffset e(offset); 2023 e.entry.flags = data.GetULEB128(&offset); 2024 const char *import_name = NULL; 2025 if (e.entry.flags & EXPORT_SYMBOL_FLAGS_REEXPORT) { 2026 e.entry.address = 0; 2027 e.entry.other = data.GetULEB128(&offset); // dylib ordinal 2028 import_name = data.GetCStr(&offset); 2029 } else { 2030 e.entry.address = data.GetULEB128(&offset); 2031 if (e.entry.flags & EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER) { 2032 e.entry.other = data.GetULEB128(&offset); 2033 uint64_t resolver_addr = e.entry.other; 2034 if (is_arm) 2035 resolver_addr &= THUMB_ADDRESS_BIT_MASK; 2036 resolver_addresses.insert(resolver_addr); 2037 } else 2038 e.entry.other = 0; 2039 } 2040 // Only add symbols that are reexport symbols with a valid import name 2041 if (EXPORT_SYMBOL_FLAGS_REEXPORT & e.entry.flags && import_name && 2042 import_name[0]) { 2043 std::string name; 2044 if (!nameSlices.empty()) { 2045 for (auto name_slice : nameSlices) 2046 name.append(name_slice.data(), name_slice.size()); 2047 } 2048 if (name.size() > 1) { 2049 // Skip the leading '_' 2050 e.entry.name.SetCStringWithLength(name.c_str() + 1, name.size() - 1); 2051 } 2052 if (import_name) { 2053 // Skip the leading '_' 2054 e.entry.import_name.SetCString(import_name + 1); 2055 } 2056 output.push_back(e); 2057 } 2058 } 2059 2060 const uint8_t childrenCount = data.GetU8(&children_offset); 2061 for (uint8_t i = 0; i < childrenCount; ++i) { 2062 const char *cstr = data.GetCStr(&children_offset); 2063 if (cstr) 2064 nameSlices.push_back(llvm::StringRef(cstr)); 2065 else 2066 return false; // Corrupt data 2067 lldb::offset_t childNodeOffset = data.GetULEB128(&children_offset); 2068 if (childNodeOffset) { 2069 if (!ParseTrieEntries(data, childNodeOffset, is_arm, nameSlices, 2070 resolver_addresses, output)) { 2071 return false; 2072 } 2073 } 2074 nameSlices.pop_back(); 2075 } 2076 return true; 2077 } 2078 2079 // Read the UUID out of a dyld_shared_cache file on-disk. 2080 UUID ObjectFileMachO::GetSharedCacheUUID(FileSpec dyld_shared_cache, 2081 const ByteOrder byte_order, 2082 const uint32_t addr_byte_size) { 2083 UUID dsc_uuid; 2084 DataBufferSP DscData = MapFileData( 2085 dyld_shared_cache, sizeof(struct lldb_copy_dyld_cache_header_v1), 0); 2086 if (!DscData) 2087 return dsc_uuid; 2088 DataExtractor dsc_header_data(DscData, byte_order, addr_byte_size); 2089 2090 char version_str[7]; 2091 lldb::offset_t offset = 0; 2092 memcpy(version_str, dsc_header_data.GetData(&offset, 6), 6); 2093 version_str[6] = '\0'; 2094 if (strcmp(version_str, "dyld_v") == 0) { 2095 offset = offsetof(struct lldb_copy_dyld_cache_header_v1, uuid); 2096 dsc_uuid = UUID::fromOptionalData( 2097 dsc_header_data.GetData(&offset, sizeof(uuid_t)), sizeof(uuid_t)); 2098 } 2099 Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYMBOLS)); 2100 if (log && dsc_uuid.IsValid()) { 2101 log->Printf("Shared cache %s has UUID %s", dyld_shared_cache.GetPath().c_str(), 2102 dsc_uuid.GetAsString().c_str()); 2103 } 2104 return dsc_uuid; 2105 } 2106 2107 size_t ObjectFileMachO::ParseSymtab() { 2108 static Timer::Category func_cat(LLVM_PRETTY_FUNCTION); 2109 Timer scoped_timer(func_cat, "ObjectFileMachO::ParseSymtab () module = %s", 2110 m_file.GetFilename().AsCString("")); 2111 ModuleSP module_sp(GetModule()); 2112 if (!module_sp) 2113 return 0; 2114 2115 struct symtab_command symtab_load_command = {0, 0, 0, 0, 0, 0}; 2116 struct linkedit_data_command function_starts_load_command = {0, 0, 0, 0}; 2117 struct dyld_info_command dyld_info = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; 2118 typedef AddressDataArray<lldb::addr_t, bool, 100> FunctionStarts; 2119 FunctionStarts function_starts; 2120 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 2121 uint32_t i; 2122 FileSpecList dylib_files; 2123 Log *log(lldb_private::GetLogIfAllCategoriesSet(LIBLLDB_LOG_SYMBOLS)); 2124 static const llvm::StringRef g_objc_v2_prefix_class("_OBJC_CLASS_$_"); 2125 static const llvm::StringRef g_objc_v2_prefix_metaclass("_OBJC_METACLASS_$_"); 2126 static const llvm::StringRef g_objc_v2_prefix_ivar("_OBJC_IVAR_$_"); 2127 2128 for (i = 0; i < m_header.ncmds; ++i) { 2129 const lldb::offset_t cmd_offset = offset; 2130 // Read in the load command and load command size 2131 struct load_command lc; 2132 if (m_data.GetU32(&offset, &lc, 2) == NULL) 2133 break; 2134 // Watch for the symbol table load command 2135 switch (lc.cmd) { 2136 case LC_SYMTAB: 2137 symtab_load_command.cmd = lc.cmd; 2138 symtab_load_command.cmdsize = lc.cmdsize; 2139 // Read in the rest of the symtab load command 2140 if (m_data.GetU32(&offset, &symtab_load_command.symoff, 4) == 2141 0) // fill in symoff, nsyms, stroff, strsize fields 2142 return 0; 2143 if (symtab_load_command.symoff == 0) { 2144 if (log) 2145 module_sp->LogMessage(log, "LC_SYMTAB.symoff == 0"); 2146 return 0; 2147 } 2148 2149 if (symtab_load_command.stroff == 0) { 2150 if (log) 2151 module_sp->LogMessage(log, "LC_SYMTAB.stroff == 0"); 2152 return 0; 2153 } 2154 2155 if (symtab_load_command.nsyms == 0) { 2156 if (log) 2157 module_sp->LogMessage(log, "LC_SYMTAB.nsyms == 0"); 2158 return 0; 2159 } 2160 2161 if (symtab_load_command.strsize == 0) { 2162 if (log) 2163 module_sp->LogMessage(log, "LC_SYMTAB.strsize == 0"); 2164 return 0; 2165 } 2166 break; 2167 2168 case LC_DYLD_INFO: 2169 case LC_DYLD_INFO_ONLY: 2170 if (m_data.GetU32(&offset, &dyld_info.rebase_off, 10)) { 2171 dyld_info.cmd = lc.cmd; 2172 dyld_info.cmdsize = lc.cmdsize; 2173 } else { 2174 memset(&dyld_info, 0, sizeof(dyld_info)); 2175 } 2176 break; 2177 2178 case LC_LOAD_DYLIB: 2179 case LC_LOAD_WEAK_DYLIB: 2180 case LC_REEXPORT_DYLIB: 2181 case LC_LOADFVMLIB: 2182 case LC_LOAD_UPWARD_DYLIB: { 2183 uint32_t name_offset = cmd_offset + m_data.GetU32(&offset); 2184 const char *path = m_data.PeekCStr(name_offset); 2185 if (path) { 2186 FileSpec file_spec(path); 2187 // Strip the path if there is @rpath, @executable, etc so we just use 2188 // the basename 2189 if (path[0] == '@') 2190 file_spec.GetDirectory().Clear(); 2191 2192 if (lc.cmd == LC_REEXPORT_DYLIB) { 2193 m_reexported_dylibs.AppendIfUnique(file_spec); 2194 } 2195 2196 dylib_files.Append(file_spec); 2197 } 2198 } break; 2199 2200 case LC_FUNCTION_STARTS: 2201 function_starts_load_command.cmd = lc.cmd; 2202 function_starts_load_command.cmdsize = lc.cmdsize; 2203 if (m_data.GetU32(&offset, &function_starts_load_command.dataoff, 2) == 2204 NULL) // fill in symoff, nsyms, stroff, strsize fields 2205 memset(&function_starts_load_command, 0, 2206 sizeof(function_starts_load_command)); 2207 break; 2208 2209 default: 2210 break; 2211 } 2212 offset = cmd_offset + lc.cmdsize; 2213 } 2214 2215 if (symtab_load_command.cmd) { 2216 Symtab *symtab = m_symtab_ap.get(); 2217 SectionList *section_list = GetSectionList(); 2218 if (section_list == NULL) 2219 return 0; 2220 2221 const uint32_t addr_byte_size = m_data.GetAddressByteSize(); 2222 const ByteOrder byte_order = m_data.GetByteOrder(); 2223 bool bit_width_32 = addr_byte_size == 4; 2224 const size_t nlist_byte_size = 2225 bit_width_32 ? sizeof(struct nlist) : sizeof(struct nlist_64); 2226 2227 DataExtractor nlist_data(NULL, 0, byte_order, addr_byte_size); 2228 DataExtractor strtab_data(NULL, 0, byte_order, addr_byte_size); 2229 DataExtractor function_starts_data(NULL, 0, byte_order, addr_byte_size); 2230 DataExtractor indirect_symbol_index_data(NULL, 0, byte_order, 2231 addr_byte_size); 2232 DataExtractor dyld_trie_data(NULL, 0, byte_order, addr_byte_size); 2233 2234 const addr_t nlist_data_byte_size = 2235 symtab_load_command.nsyms * nlist_byte_size; 2236 const addr_t strtab_data_byte_size = symtab_load_command.strsize; 2237 addr_t strtab_addr = LLDB_INVALID_ADDRESS; 2238 2239 ProcessSP process_sp(m_process_wp.lock()); 2240 Process *process = process_sp.get(); 2241 2242 uint32_t memory_module_load_level = eMemoryModuleLoadLevelComplete; 2243 2244 if (process && m_header.filetype != llvm::MachO::MH_OBJECT) { 2245 Target &target = process->GetTarget(); 2246 2247 memory_module_load_level = target.GetMemoryModuleLoadLevel(); 2248 2249 SectionSP linkedit_section_sp( 2250 section_list->FindSectionByName(GetSegmentNameLINKEDIT())); 2251 // Reading mach file from memory in a process or core file... 2252 2253 if (linkedit_section_sp) { 2254 addr_t linkedit_load_addr = 2255 linkedit_section_sp->GetLoadBaseAddress(&target); 2256 if (linkedit_load_addr == LLDB_INVALID_ADDRESS) { 2257 // We might be trying to access the symbol table before the 2258 // __LINKEDIT's load address has been set in the target. We can't 2259 // fail to read the symbol table, so calculate the right address 2260 // manually 2261 linkedit_load_addr = CalculateSectionLoadAddressForMemoryImage( 2262 m_memory_addr, GetMachHeaderSection(), linkedit_section_sp.get()); 2263 } 2264 2265 const addr_t linkedit_file_offset = 2266 linkedit_section_sp->GetFileOffset(); 2267 const addr_t symoff_addr = linkedit_load_addr + 2268 symtab_load_command.symoff - 2269 linkedit_file_offset; 2270 strtab_addr = linkedit_load_addr + symtab_load_command.stroff - 2271 linkedit_file_offset; 2272 2273 bool data_was_read = false; 2274 2275 #if defined(__APPLE__) && \ 2276 (defined(__arm__) || defined(__arm64__) || defined(__aarch64__)) 2277 if (m_header.flags & 0x80000000u && 2278 process->GetAddressByteSize() == sizeof(void *)) { 2279 // This mach-o memory file is in the dyld shared cache. If this 2280 // program is not remote and this is iOS, then this process will 2281 // share the same shared cache as the process we are debugging and we 2282 // can read the entire __LINKEDIT from the address space in this 2283 // process. This is a needed optimization that is used for local iOS 2284 // debugging only since all shared libraries in the shared cache do 2285 // not have corresponding files that exist in the file system of the 2286 // device. They have been combined into a single file. This means we 2287 // always have to load these files from memory. All of the symbol and 2288 // string tables from all of the __LINKEDIT sections from the shared 2289 // libraries in the shared cache have been merged into a single large 2290 // symbol and string table. Reading all of this symbol and string 2291 // table data across can slow down debug launch times, so we optimize 2292 // this by reading the memory for the __LINKEDIT section from this 2293 // process. 2294 2295 UUID lldb_shared_cache; 2296 addr_t lldb_shared_cache_addr; 2297 GetLLDBSharedCacheUUID (lldb_shared_cache_addr, lldb_shared_cache); 2298 UUID process_shared_cache; 2299 addr_t process_shared_cache_addr; 2300 GetProcessSharedCacheUUID(process, process_shared_cache_addr, process_shared_cache); 2301 bool use_lldb_cache = true; 2302 if (lldb_shared_cache.IsValid() && process_shared_cache.IsValid() && 2303 (lldb_shared_cache != process_shared_cache 2304 || process_shared_cache_addr != lldb_shared_cache_addr)) { 2305 use_lldb_cache = false; 2306 } 2307 2308 PlatformSP platform_sp(target.GetPlatform()); 2309 if (platform_sp && platform_sp->IsHost() && use_lldb_cache) { 2310 data_was_read = true; 2311 nlist_data.SetData((void *)symoff_addr, nlist_data_byte_size, 2312 eByteOrderLittle); 2313 strtab_data.SetData((void *)strtab_addr, strtab_data_byte_size, 2314 eByteOrderLittle); 2315 if (function_starts_load_command.cmd) { 2316 const addr_t func_start_addr = 2317 linkedit_load_addr + function_starts_load_command.dataoff - 2318 linkedit_file_offset; 2319 function_starts_data.SetData( 2320 (void *)func_start_addr, 2321 function_starts_load_command.datasize, eByteOrderLittle); 2322 } 2323 } 2324 } 2325 #endif 2326 2327 if (!data_was_read) { 2328 // Always load dyld - the dynamic linker - from memory if we didn't 2329 // find a binary anywhere else. lldb will not register 2330 // dylib/framework/bundle loads/unloads if we don't have the dyld 2331 // symbols, we force dyld to load from memory despite the user's 2332 // target.memory-module-load-level setting. 2333 if (memory_module_load_level == eMemoryModuleLoadLevelComplete || 2334 m_header.filetype == llvm::MachO::MH_DYLINKER) { 2335 DataBufferSP nlist_data_sp( 2336 ReadMemory(process_sp, symoff_addr, nlist_data_byte_size)); 2337 if (nlist_data_sp) 2338 nlist_data.SetData(nlist_data_sp, 0, 2339 nlist_data_sp->GetByteSize()); 2340 if (m_dysymtab.nindirectsyms != 0) { 2341 const addr_t indirect_syms_addr = linkedit_load_addr + 2342 m_dysymtab.indirectsymoff - 2343 linkedit_file_offset; 2344 DataBufferSP indirect_syms_data_sp( 2345 ReadMemory(process_sp, indirect_syms_addr, 2346 m_dysymtab.nindirectsyms * 4)); 2347 if (indirect_syms_data_sp) 2348 indirect_symbol_index_data.SetData( 2349 indirect_syms_data_sp, 0, 2350 indirect_syms_data_sp->GetByteSize()); 2351 // If this binary is outside the shared cache, 2352 // cache the string table. 2353 // Binaries in the shared cache all share a giant string table, and 2354 // we can't share the string tables across multiple ObjectFileMachO's, 2355 // so we'd end up re-reading this mega-strtab for every binary 2356 // in the shared cache - it would be a big perf problem. 2357 // For binaries outside the shared cache, it's faster to read the 2358 // entire strtab at once instead of piece-by-piece as we process 2359 // the nlist records. 2360 if ((m_header.flags & 0x80000000u) == 0) { 2361 DataBufferSP strtab_data_sp (ReadMemory (process_sp, strtab_addr, 2362 strtab_data_byte_size)); 2363 if (strtab_data_sp) { 2364 strtab_data.SetData (strtab_data_sp, 0, strtab_data_sp->GetByteSize()); 2365 } 2366 } 2367 } 2368 } 2369 if (memory_module_load_level >= 2370 eMemoryModuleLoadLevelPartial) { 2371 if (function_starts_load_command.cmd) { 2372 const addr_t func_start_addr = 2373 linkedit_load_addr + function_starts_load_command.dataoff - 2374 linkedit_file_offset; 2375 DataBufferSP func_start_data_sp( 2376 ReadMemory(process_sp, func_start_addr, 2377 function_starts_load_command.datasize)); 2378 if (func_start_data_sp) 2379 function_starts_data.SetData(func_start_data_sp, 0, 2380 func_start_data_sp->GetByteSize()); 2381 } 2382 } 2383 } 2384 } 2385 } else { 2386 nlist_data.SetData(m_data, symtab_load_command.symoff, 2387 nlist_data_byte_size); 2388 strtab_data.SetData(m_data, symtab_load_command.stroff, 2389 strtab_data_byte_size); 2390 2391 if (dyld_info.export_size > 0) { 2392 dyld_trie_data.SetData(m_data, dyld_info.export_off, 2393 dyld_info.export_size); 2394 } 2395 2396 if (m_dysymtab.nindirectsyms != 0) { 2397 indirect_symbol_index_data.SetData(m_data, m_dysymtab.indirectsymoff, 2398 m_dysymtab.nindirectsyms * 4); 2399 } 2400 if (function_starts_load_command.cmd) { 2401 function_starts_data.SetData(m_data, 2402 function_starts_load_command.dataoff, 2403 function_starts_load_command.datasize); 2404 } 2405 } 2406 2407 if (nlist_data.GetByteSize() == 0 && 2408 memory_module_load_level == eMemoryModuleLoadLevelComplete) { 2409 if (log) 2410 module_sp->LogMessage(log, "failed to read nlist data"); 2411 return 0; 2412 } 2413 2414 const bool have_strtab_data = strtab_data.GetByteSize() > 0; 2415 if (!have_strtab_data) { 2416 if (process) { 2417 if (strtab_addr == LLDB_INVALID_ADDRESS) { 2418 if (log) 2419 module_sp->LogMessage(log, "failed to locate the strtab in memory"); 2420 return 0; 2421 } 2422 } else { 2423 if (log) 2424 module_sp->LogMessage(log, "failed to read strtab data"); 2425 return 0; 2426 } 2427 } 2428 2429 const ConstString &g_segment_name_TEXT = GetSegmentNameTEXT(); 2430 const ConstString &g_segment_name_DATA = GetSegmentNameDATA(); 2431 const ConstString &g_segment_name_DATA_DIRTY = GetSegmentNameDATA_DIRTY(); 2432 const ConstString &g_segment_name_DATA_CONST = GetSegmentNameDATA_CONST(); 2433 const ConstString &g_segment_name_OBJC = GetSegmentNameOBJC(); 2434 const ConstString &g_section_name_eh_frame = GetSectionNameEHFrame(); 2435 SectionSP text_section_sp( 2436 section_list->FindSectionByName(g_segment_name_TEXT)); 2437 SectionSP data_section_sp( 2438 section_list->FindSectionByName(g_segment_name_DATA)); 2439 SectionSP data_dirty_section_sp( 2440 section_list->FindSectionByName(g_segment_name_DATA_DIRTY)); 2441 SectionSP data_const_section_sp( 2442 section_list->FindSectionByName(g_segment_name_DATA_CONST)); 2443 SectionSP objc_section_sp( 2444 section_list->FindSectionByName(g_segment_name_OBJC)); 2445 SectionSP eh_frame_section_sp; 2446 if (text_section_sp.get()) 2447 eh_frame_section_sp = text_section_sp->GetChildren().FindSectionByName( 2448 g_section_name_eh_frame); 2449 else 2450 eh_frame_section_sp = 2451 section_list->FindSectionByName(g_section_name_eh_frame); 2452 2453 const bool is_arm = (m_header.cputype == llvm::MachO::CPU_TYPE_ARM); 2454 2455 // lldb works best if it knows the start address of all functions in a 2456 // module. Linker symbols or debug info are normally the best source of 2457 // information for start addr / size but they may be stripped in a released 2458 // binary. Two additional sources of information exist in Mach-O binaries: 2459 // LC_FUNCTION_STARTS - a list of ULEB128 encoded offsets of each 2460 // function's start address in the 2461 // binary, relative to the text section. 2462 // eh_frame - the eh_frame FDEs have the start addr & size of 2463 // each function 2464 // LC_FUNCTION_STARTS is the fastest source to read in, and is present on 2465 // all modern binaries. 2466 // Binaries built to run on older releases may need to use eh_frame 2467 // information. 2468 2469 if (text_section_sp && function_starts_data.GetByteSize()) { 2470 FunctionStarts::Entry function_start_entry; 2471 function_start_entry.data = false; 2472 lldb::offset_t function_start_offset = 0; 2473 function_start_entry.addr = text_section_sp->GetFileAddress(); 2474 uint64_t delta; 2475 while ((delta = function_starts_data.GetULEB128(&function_start_offset)) > 2476 0) { 2477 // Now append the current entry 2478 function_start_entry.addr += delta; 2479 function_starts.Append(function_start_entry); 2480 } 2481 } else { 2482 // If m_type is eTypeDebugInfo, then this is a dSYM - it will have the 2483 // load command claiming an eh_frame but it doesn't actually have the 2484 // eh_frame content. And if we have a dSYM, we don't need to do any of 2485 // this fill-in-the-missing-symbols works anyway - the debug info should 2486 // give us all the functions in the module. 2487 if (text_section_sp.get() && eh_frame_section_sp.get() && 2488 m_type != eTypeDebugInfo) { 2489 DWARFCallFrameInfo eh_frame(*this, eh_frame_section_sp, 2490 DWARFCallFrameInfo::EH); 2491 DWARFCallFrameInfo::FunctionAddressAndSizeVector functions; 2492 eh_frame.GetFunctionAddressAndSizeVector(functions); 2493 addr_t text_base_addr = text_section_sp->GetFileAddress(); 2494 size_t count = functions.GetSize(); 2495 for (size_t i = 0; i < count; ++i) { 2496 const DWARFCallFrameInfo::FunctionAddressAndSizeVector::Entry *func = 2497 functions.GetEntryAtIndex(i); 2498 if (func) { 2499 FunctionStarts::Entry function_start_entry; 2500 function_start_entry.addr = func->base - text_base_addr; 2501 function_starts.Append(function_start_entry); 2502 } 2503 } 2504 } 2505 } 2506 2507 const size_t function_starts_count = function_starts.GetSize(); 2508 2509 // For user process binaries (executables, dylibs, frameworks, bundles), if 2510 // we don't have LC_FUNCTION_STARTS/eh_frame section in this binary, we're 2511 // going to assume the binary has been stripped. Don't allow assembly 2512 // language instruction emulation because we don't know proper function 2513 // start boundaries. 2514 // 2515 // For all other types of binaries (kernels, stand-alone bare board 2516 // binaries, kexts), they may not have LC_FUNCTION_STARTS / eh_frame 2517 // sections - we should not make any assumptions about them based on that. 2518 if (function_starts_count == 0 && CalculateStrata() == eStrataUser) { 2519 m_allow_assembly_emulation_unwind_plans = false; 2520 Log *unwind_or_symbol_log(lldb_private::GetLogIfAnyCategoriesSet( 2521 LIBLLDB_LOG_SYMBOLS | LIBLLDB_LOG_UNWIND)); 2522 2523 if (unwind_or_symbol_log) 2524 module_sp->LogMessage( 2525 unwind_or_symbol_log, 2526 "no LC_FUNCTION_STARTS, will not allow assembly profiled unwinds"); 2527 } 2528 2529 const user_id_t TEXT_eh_frame_sectID = 2530 eh_frame_section_sp.get() ? eh_frame_section_sp->GetID() 2531 : static_cast<user_id_t>(NO_SECT); 2532 2533 lldb::offset_t nlist_data_offset = 0; 2534 2535 uint32_t N_SO_index = UINT32_MAX; 2536 2537 MachSymtabSectionInfo section_info(section_list); 2538 std::vector<uint32_t> N_FUN_indexes; 2539 std::vector<uint32_t> N_NSYM_indexes; 2540 std::vector<uint32_t> N_INCL_indexes; 2541 std::vector<uint32_t> N_BRAC_indexes; 2542 std::vector<uint32_t> N_COMM_indexes; 2543 typedef std::multimap<uint64_t, uint32_t> ValueToSymbolIndexMap; 2544 typedef std::map<uint32_t, uint32_t> NListIndexToSymbolIndexMap; 2545 typedef std::map<const char *, uint32_t> ConstNameToSymbolIndexMap; 2546 ValueToSymbolIndexMap N_FUN_addr_to_sym_idx; 2547 ValueToSymbolIndexMap N_STSYM_addr_to_sym_idx; 2548 ConstNameToSymbolIndexMap N_GSYM_name_to_sym_idx; 2549 // Any symbols that get merged into another will get an entry in this map 2550 // so we know 2551 NListIndexToSymbolIndexMap m_nlist_idx_to_sym_idx; 2552 uint32_t nlist_idx = 0; 2553 Symbol *symbol_ptr = NULL; 2554 2555 uint32_t sym_idx = 0; 2556 Symbol *sym = NULL; 2557 size_t num_syms = 0; 2558 std::string memory_symbol_name; 2559 uint32_t unmapped_local_symbols_found = 0; 2560 2561 std::vector<TrieEntryWithOffset> trie_entries; 2562 std::set<lldb::addr_t> resolver_addresses; 2563 2564 if (dyld_trie_data.GetByteSize() > 0) { 2565 std::vector<llvm::StringRef> nameSlices; 2566 ParseTrieEntries(dyld_trie_data, 0, is_arm, nameSlices, 2567 resolver_addresses, trie_entries); 2568 2569 ConstString text_segment_name("__TEXT"); 2570 SectionSP text_segment_sp = 2571 GetSectionList()->FindSectionByName(text_segment_name); 2572 if (text_segment_sp) { 2573 const lldb::addr_t text_segment_file_addr = 2574 text_segment_sp->GetFileAddress(); 2575 if (text_segment_file_addr != LLDB_INVALID_ADDRESS) { 2576 for (auto &e : trie_entries) 2577 e.entry.address += text_segment_file_addr; 2578 } 2579 } 2580 } 2581 2582 typedef std::set<ConstString> IndirectSymbols; 2583 IndirectSymbols indirect_symbol_names; 2584 2585 #if defined(__APPLE__) && \ 2586 (defined(__arm__) || defined(__arm64__) || defined(__aarch64__)) 2587 2588 // Some recent builds of the dyld_shared_cache (hereafter: DSC) have been 2589 // optimized by moving LOCAL symbols out of the memory mapped portion of 2590 // the DSC. The symbol information has all been retained, but it isn't 2591 // available in the normal nlist data. However, there *are* duplicate 2592 // entries of *some* 2593 // LOCAL symbols in the normal nlist data. To handle this situation 2594 // correctly, we must first attempt 2595 // to parse any DSC unmapped symbol information. If we find any, we set a 2596 // flag that tells the normal nlist parser to ignore all LOCAL symbols. 2597 2598 if (m_header.flags & 0x80000000u) { 2599 // Before we can start mapping the DSC, we need to make certain the 2600 // target process is actually using the cache we can find. 2601 2602 // Next we need to determine the correct path for the dyld shared cache. 2603 2604 ArchSpec header_arch; 2605 GetArchitecture(header_arch); 2606 char dsc_path[PATH_MAX]; 2607 char dsc_path_development[PATH_MAX]; 2608 2609 snprintf( 2610 dsc_path, sizeof(dsc_path), "%s%s%s", 2611 "/System/Library/Caches/com.apple.dyld/", /* IPHONE_DYLD_SHARED_CACHE_DIR 2612 */ 2613 "dyld_shared_cache_", /* DYLD_SHARED_CACHE_BASE_NAME */ 2614 header_arch.GetArchitectureName()); 2615 2616 snprintf( 2617 dsc_path_development, sizeof(dsc_path), "%s%s%s%s", 2618 "/System/Library/Caches/com.apple.dyld/", /* IPHONE_DYLD_SHARED_CACHE_DIR 2619 */ 2620 "dyld_shared_cache_", /* DYLD_SHARED_CACHE_BASE_NAME */ 2621 header_arch.GetArchitectureName(), ".development"); 2622 2623 FileSpec dsc_nondevelopment_filespec(dsc_path, false); 2624 FileSpec dsc_development_filespec(dsc_path_development, false); 2625 FileSpec dsc_filespec; 2626 2627 UUID dsc_uuid; 2628 UUID process_shared_cache_uuid; 2629 addr_t process_shared_cache_base_addr; 2630 2631 if (process) { 2632 GetProcessSharedCacheUUID(process, process_shared_cache_base_addr, process_shared_cache_uuid); 2633 } 2634 2635 // First see if we can find an exact match for the inferior process 2636 // shared cache UUID in the development or non-development shared caches 2637 // on disk. 2638 if (process_shared_cache_uuid.IsValid()) { 2639 if (FileSystem::Instance().Exists(dsc_development_filespec)) { 2640 UUID dsc_development_uuid = GetSharedCacheUUID( 2641 dsc_development_filespec, byte_order, addr_byte_size); 2642 if (dsc_development_uuid.IsValid() && 2643 dsc_development_uuid == process_shared_cache_uuid) { 2644 dsc_filespec = dsc_development_filespec; 2645 dsc_uuid = dsc_development_uuid; 2646 } 2647 } 2648 if (!dsc_uuid.IsValid() && 2649 FileSystem::Instance().Exists(dsc_nondevelopment_filespec)) { 2650 UUID dsc_nondevelopment_uuid = GetSharedCacheUUID( 2651 dsc_nondevelopment_filespec, byte_order, addr_byte_size); 2652 if (dsc_nondevelopment_uuid.IsValid() && 2653 dsc_nondevelopment_uuid == process_shared_cache_uuid) { 2654 dsc_filespec = dsc_nondevelopment_filespec; 2655 dsc_uuid = dsc_nondevelopment_uuid; 2656 } 2657 } 2658 } 2659 2660 // Failing a UUID match, prefer the development dyld_shared cache if both 2661 // are present. 2662 if (!FileSystem::Instance().Exists(dsc_filespec)) { 2663 if (FileSystem::Instance().Exists(dsc_development_filespec)) { 2664 dsc_filespec = dsc_development_filespec; 2665 } else { 2666 dsc_filespec = dsc_nondevelopment_filespec; 2667 } 2668 } 2669 2670 /* The dyld_cache_header has a pointer to the 2671 dyld_cache_local_symbols_info structure (localSymbolsOffset). 2672 The dyld_cache_local_symbols_info structure gives us three things: 2673 1. The start and count of the nlist records in the dyld_shared_cache 2674 file 2675 2. The start and size of the strings for these nlist records 2676 3. The start and count of dyld_cache_local_symbols_entry entries 2677 2678 There is one dyld_cache_local_symbols_entry per dylib/framework in the 2679 dyld shared cache. 2680 The "dylibOffset" field is the Mach-O header of this dylib/framework in 2681 the dyld shared cache. 2682 The dyld_cache_local_symbols_entry also lists the start of this 2683 dylib/framework's nlist records 2684 and the count of how many nlist records there are for this 2685 dylib/framework. 2686 */ 2687 2688 // Process the dyld shared cache header to find the unmapped symbols 2689 2690 DataBufferSP dsc_data_sp = MapFileData( 2691 dsc_filespec, sizeof(struct lldb_copy_dyld_cache_header_v1), 0); 2692 if (!dsc_uuid.IsValid()) { 2693 dsc_uuid = GetSharedCacheUUID(dsc_filespec, byte_order, addr_byte_size); 2694 } 2695 if (dsc_data_sp) { 2696 DataExtractor dsc_header_data(dsc_data_sp, byte_order, addr_byte_size); 2697 2698 bool uuid_match = true; 2699 if (dsc_uuid.IsValid() && process) { 2700 if (process_shared_cache_uuid.IsValid() && 2701 dsc_uuid != process_shared_cache_uuid) { 2702 // The on-disk dyld_shared_cache file is not the same as the one in 2703 // this process' memory, don't use it. 2704 uuid_match = false; 2705 ModuleSP module_sp(GetModule()); 2706 if (module_sp) 2707 module_sp->ReportWarning("process shared cache does not match " 2708 "on-disk dyld_shared_cache file, some " 2709 "symbol names will be missing."); 2710 } 2711 } 2712 2713 offset = offsetof(struct lldb_copy_dyld_cache_header_v1, mappingOffset); 2714 2715 uint32_t mappingOffset = dsc_header_data.GetU32(&offset); 2716 2717 // If the mappingOffset points to a location inside the header, we've 2718 // opened an old dyld shared cache, and should not proceed further. 2719 if (uuid_match && 2720 mappingOffset >= sizeof(struct lldb_copy_dyld_cache_header_v1)) { 2721 2722 DataBufferSP dsc_mapping_info_data_sp = MapFileData( 2723 dsc_filespec, sizeof(struct lldb_copy_dyld_cache_mapping_info), 2724 mappingOffset); 2725 2726 DataExtractor dsc_mapping_info_data(dsc_mapping_info_data_sp, 2727 byte_order, addr_byte_size); 2728 offset = 0; 2729 2730 // The File addresses (from the in-memory Mach-O load commands) for 2731 // the shared libraries in the shared library cache need to be 2732 // adjusted by an offset to match up with the dylibOffset identifying 2733 // field in the dyld_cache_local_symbol_entry's. This offset is 2734 // recorded in mapping_offset_value. 2735 const uint64_t mapping_offset_value = 2736 dsc_mapping_info_data.GetU64(&offset); 2737 2738 offset = offsetof(struct lldb_copy_dyld_cache_header_v1, 2739 localSymbolsOffset); 2740 uint64_t localSymbolsOffset = dsc_header_data.GetU64(&offset); 2741 uint64_t localSymbolsSize = dsc_header_data.GetU64(&offset); 2742 2743 if (localSymbolsOffset && localSymbolsSize) { 2744 // Map the local symbols 2745 DataBufferSP dsc_local_symbols_data_sp = 2746 MapFileData(dsc_filespec, localSymbolsSize, localSymbolsOffset); 2747 2748 if (dsc_local_symbols_data_sp) { 2749 DataExtractor dsc_local_symbols_data(dsc_local_symbols_data_sp, 2750 byte_order, addr_byte_size); 2751 2752 offset = 0; 2753 2754 typedef std::map<ConstString, uint16_t> UndefinedNameToDescMap; 2755 typedef std::map<uint32_t, ConstString> SymbolIndexToName; 2756 UndefinedNameToDescMap undefined_name_to_desc; 2757 SymbolIndexToName reexport_shlib_needs_fixup; 2758 2759 // Read the local_symbols_infos struct in one shot 2760 struct lldb_copy_dyld_cache_local_symbols_info local_symbols_info; 2761 dsc_local_symbols_data.GetU32(&offset, 2762 &local_symbols_info.nlistOffset, 6); 2763 2764 SectionSP text_section_sp( 2765 section_list->FindSectionByName(GetSegmentNameTEXT())); 2766 2767 uint32_t header_file_offset = 2768 (text_section_sp->GetFileAddress() - mapping_offset_value); 2769 2770 offset = local_symbols_info.entriesOffset; 2771 for (uint32_t entry_index = 0; 2772 entry_index < local_symbols_info.entriesCount; 2773 entry_index++) { 2774 struct lldb_copy_dyld_cache_local_symbols_entry 2775 local_symbols_entry; 2776 local_symbols_entry.dylibOffset = 2777 dsc_local_symbols_data.GetU32(&offset); 2778 local_symbols_entry.nlistStartIndex = 2779 dsc_local_symbols_data.GetU32(&offset); 2780 local_symbols_entry.nlistCount = 2781 dsc_local_symbols_data.GetU32(&offset); 2782 2783 if (header_file_offset == local_symbols_entry.dylibOffset) { 2784 unmapped_local_symbols_found = local_symbols_entry.nlistCount; 2785 2786 // The normal nlist code cannot correctly size the Symbols 2787 // array, we need to allocate it here. 2788 sym = symtab->Resize( 2789 symtab_load_command.nsyms + m_dysymtab.nindirectsyms + 2790 unmapped_local_symbols_found - m_dysymtab.nlocalsym); 2791 num_syms = symtab->GetNumSymbols(); 2792 2793 nlist_data_offset = 2794 local_symbols_info.nlistOffset + 2795 (nlist_byte_size * local_symbols_entry.nlistStartIndex); 2796 uint32_t string_table_offset = 2797 local_symbols_info.stringsOffset; 2798 2799 for (uint32_t nlist_index = 0; 2800 nlist_index < local_symbols_entry.nlistCount; 2801 nlist_index++) { 2802 ///////////////////////////// 2803 { 2804 struct nlist_64 nlist; 2805 if (!dsc_local_symbols_data.ValidOffsetForDataOfSize( 2806 nlist_data_offset, nlist_byte_size)) 2807 break; 2808 2809 nlist.n_strx = dsc_local_symbols_data.GetU32_unchecked( 2810 &nlist_data_offset); 2811 nlist.n_type = dsc_local_symbols_data.GetU8_unchecked( 2812 &nlist_data_offset); 2813 nlist.n_sect = dsc_local_symbols_data.GetU8_unchecked( 2814 &nlist_data_offset); 2815 nlist.n_desc = dsc_local_symbols_data.GetU16_unchecked( 2816 &nlist_data_offset); 2817 nlist.n_value = 2818 dsc_local_symbols_data.GetAddress_unchecked( 2819 &nlist_data_offset); 2820 2821 SymbolType type = eSymbolTypeInvalid; 2822 const char *symbol_name = dsc_local_symbols_data.PeekCStr( 2823 string_table_offset + nlist.n_strx); 2824 2825 if (symbol_name == NULL) { 2826 // No symbol should be NULL, even the symbols with no 2827 // string values should have an offset zero which 2828 // points to an empty C-string 2829 Host::SystemLog( 2830 Host::eSystemLogError, 2831 "error: DSC unmapped local symbol[%u] has invalid " 2832 "string table offset 0x%x in %s, ignoring symbol\n", 2833 entry_index, nlist.n_strx, 2834 module_sp->GetFileSpec().GetPath().c_str()); 2835 continue; 2836 } 2837 if (symbol_name[0] == '\0') 2838 symbol_name = NULL; 2839 2840 const char *symbol_name_non_abi_mangled = NULL; 2841 2842 SectionSP symbol_section; 2843 uint32_t symbol_byte_size = 0; 2844 bool add_nlist = true; 2845 bool is_debug = ((nlist.n_type & N_STAB) != 0); 2846 bool demangled_is_synthesized = false; 2847 bool is_gsym = false; 2848 bool set_value = true; 2849 2850 assert(sym_idx < num_syms); 2851 2852 sym[sym_idx].SetDebug(is_debug); 2853 2854 if (is_debug) { 2855 switch (nlist.n_type) { 2856 case N_GSYM: 2857 // global symbol: name,,NO_SECT,type,0 2858 // Sometimes the N_GSYM value contains the address. 2859 2860 // FIXME: In the .o files, we have a GSYM and a debug 2861 // symbol for all the ObjC data. They 2862 // have the same address, but we want to ensure that 2863 // we always find only the real symbol, 'cause we 2864 // don't currently correctly attribute the 2865 // GSYM one to the ObjCClass/Ivar/MetaClass 2866 // symbol type. This is a temporary hack to make 2867 // sure the ObjectiveC symbols get treated correctly. 2868 // To do this right, we should coalesce all the GSYM 2869 // & global symbols that have the same address. 2870 2871 is_gsym = true; 2872 sym[sym_idx].SetExternal(true); 2873 2874 if (symbol_name && symbol_name[0] == '_' && 2875 symbol_name[1] == 'O') { 2876 llvm::StringRef symbol_name_ref(symbol_name); 2877 if (symbol_name_ref.startswith( 2878 g_objc_v2_prefix_class)) { 2879 symbol_name_non_abi_mangled = symbol_name + 1; 2880 symbol_name = 2881 symbol_name + g_objc_v2_prefix_class.size(); 2882 type = eSymbolTypeObjCClass; 2883 demangled_is_synthesized = true; 2884 2885 } else if (symbol_name_ref.startswith( 2886 g_objc_v2_prefix_metaclass)) { 2887 symbol_name_non_abi_mangled = symbol_name + 1; 2888 symbol_name = symbol_name + 2889 g_objc_v2_prefix_metaclass.size(); 2890 type = eSymbolTypeObjCMetaClass; 2891 demangled_is_synthesized = true; 2892 } else if (symbol_name_ref.startswith( 2893 g_objc_v2_prefix_ivar)) { 2894 symbol_name_non_abi_mangled = symbol_name + 1; 2895 symbol_name = 2896 symbol_name + g_objc_v2_prefix_ivar.size(); 2897 type = eSymbolTypeObjCIVar; 2898 demangled_is_synthesized = true; 2899 } 2900 } else { 2901 if (nlist.n_value != 0) 2902 symbol_section = section_info.GetSection( 2903 nlist.n_sect, nlist.n_value); 2904 type = eSymbolTypeData; 2905 } 2906 break; 2907 2908 case N_FNAME: 2909 // procedure name (f77 kludge): name,,NO_SECT,0,0 2910 type = eSymbolTypeCompiler; 2911 break; 2912 2913 case N_FUN: 2914 // procedure: name,,n_sect,linenumber,address 2915 if (symbol_name) { 2916 type = eSymbolTypeCode; 2917 symbol_section = section_info.GetSection( 2918 nlist.n_sect, nlist.n_value); 2919 2920 N_FUN_addr_to_sym_idx.insert( 2921 std::make_pair(nlist.n_value, sym_idx)); 2922 // We use the current number of symbols in the 2923 // symbol table in lieu of using nlist_idx in case 2924 // we ever start trimming entries out 2925 N_FUN_indexes.push_back(sym_idx); 2926 } else { 2927 type = eSymbolTypeCompiler; 2928 2929 if (!N_FUN_indexes.empty()) { 2930 // Copy the size of the function into the 2931 // original 2932 // STAB entry so we don't have 2933 // to hunt for it later 2934 symtab->SymbolAtIndex(N_FUN_indexes.back()) 2935 ->SetByteSize(nlist.n_value); 2936 N_FUN_indexes.pop_back(); 2937 // We don't really need the end function STAB as 2938 // it contains the size which we already placed 2939 // with the original symbol, so don't add it if 2940 // we want a minimal symbol table 2941 add_nlist = false; 2942 } 2943 } 2944 break; 2945 2946 case N_STSYM: 2947 // static symbol: name,,n_sect,type,address 2948 N_STSYM_addr_to_sym_idx.insert( 2949 std::make_pair(nlist.n_value, sym_idx)); 2950 symbol_section = section_info.GetSection( 2951 nlist.n_sect, nlist.n_value); 2952 if (symbol_name && symbol_name[0]) { 2953 type = ObjectFile::GetSymbolTypeFromName( 2954 symbol_name + 1, eSymbolTypeData); 2955 } 2956 break; 2957 2958 case N_LCSYM: 2959 // .lcomm symbol: name,,n_sect,type,address 2960 symbol_section = section_info.GetSection( 2961 nlist.n_sect, nlist.n_value); 2962 type = eSymbolTypeCommonBlock; 2963 break; 2964 2965 case N_BNSYM: 2966 // We use the current number of symbols in the symbol 2967 // table in lieu of using nlist_idx in case we ever 2968 // start trimming entries out Skip these if we want 2969 // minimal symbol tables 2970 add_nlist = false; 2971 break; 2972 2973 case N_ENSYM: 2974 // Set the size of the N_BNSYM to the terminating 2975 // index of this N_ENSYM so that we can always skip 2976 // the entire symbol if we need to navigate more 2977 // quickly at the source level when parsing STABS 2978 // Skip these if we want minimal symbol tables 2979 add_nlist = false; 2980 break; 2981 2982 case N_OPT: 2983 // emitted with gcc2_compiled and in gcc source 2984 type = eSymbolTypeCompiler; 2985 break; 2986 2987 case N_RSYM: 2988 // register sym: name,,NO_SECT,type,register 2989 type = eSymbolTypeVariable; 2990 break; 2991 2992 case N_SLINE: 2993 // src line: 0,,n_sect,linenumber,address 2994 symbol_section = section_info.GetSection( 2995 nlist.n_sect, nlist.n_value); 2996 type = eSymbolTypeLineEntry; 2997 break; 2998 2999 case N_SSYM: 3000 // structure elt: name,,NO_SECT,type,struct_offset 3001 type = eSymbolTypeVariableType; 3002 break; 3003 3004 case N_SO: 3005 // source file name 3006 type = eSymbolTypeSourceFile; 3007 if (symbol_name == NULL) { 3008 add_nlist = false; 3009 if (N_SO_index != UINT32_MAX) { 3010 // Set the size of the N_SO to the terminating 3011 // index of this N_SO so that we can always skip 3012 // the entire N_SO if we need to navigate more 3013 // quickly at the source level when parsing STABS 3014 symbol_ptr = symtab->SymbolAtIndex(N_SO_index); 3015 symbol_ptr->SetByteSize(sym_idx); 3016 symbol_ptr->SetSizeIsSibling(true); 3017 } 3018 N_NSYM_indexes.clear(); 3019 N_INCL_indexes.clear(); 3020 N_BRAC_indexes.clear(); 3021 N_COMM_indexes.clear(); 3022 N_FUN_indexes.clear(); 3023 N_SO_index = UINT32_MAX; 3024 } else { 3025 // We use the current number of symbols in the 3026 // symbol table in lieu of using nlist_idx in case 3027 // we ever start trimming entries out 3028 const bool N_SO_has_full_path = 3029 symbol_name[0] == '/'; 3030 if (N_SO_has_full_path) { 3031 if ((N_SO_index == sym_idx - 1) && 3032 ((sym_idx - 1) < num_syms)) { 3033 // We have two consecutive N_SO entries where 3034 // the first contains a directory and the 3035 // second contains a full path. 3036 sym[sym_idx - 1].GetMangled().SetValue( 3037 ConstString(symbol_name), false); 3038 m_nlist_idx_to_sym_idx[nlist_idx] = sym_idx - 1; 3039 add_nlist = false; 3040 } else { 3041 // This is the first entry in a N_SO that 3042 // contains a directory or 3043 // a full path to the source file 3044 N_SO_index = sym_idx; 3045 } 3046 } else if ((N_SO_index == sym_idx - 1) && 3047 ((sym_idx - 1) < num_syms)) { 3048 // This is usually the second N_SO entry that 3049 // contains just the filename, so here we combine 3050 // it with the first one if we are minimizing the 3051 // symbol table 3052 const char *so_path = 3053 sym[sym_idx - 1] 3054 .GetMangled() 3055 .GetDemangledName( 3056 lldb::eLanguageTypeUnknown) 3057 .AsCString(); 3058 if (so_path && so_path[0]) { 3059 std::string full_so_path(so_path); 3060 const size_t double_slash_pos = 3061 full_so_path.find("//"); 3062 if (double_slash_pos != std::string::npos) { 3063 // The linker has been generating bad N_SO 3064 // entries with doubled up paths 3065 // in the format "%s%s" where the first 3066 // string in the DW_AT_comp_dir, and the 3067 // second is the directory for the source 3068 // file so you end up with a path that looks 3069 // like "/tmp/src//tmp/src/" 3070 FileSpec so_dir(so_path, false); 3071 if (!FileSystem::Instance().Exists(so_dir)) { 3072 so_dir.SetFile( 3073 &full_so_path[double_slash_pos + 1], 3074 false); 3075 if (FileSystem::Instance().Exists(so_dir)) { 3076 // Trim off the incorrect path 3077 full_so_path.erase(0, 3078 double_slash_pos + 1); 3079 } 3080 } 3081 } 3082 if (*full_so_path.rbegin() != '/') 3083 full_so_path += '/'; 3084 full_so_path += symbol_name; 3085 sym[sym_idx - 1].GetMangled().SetValue( 3086 ConstString(full_so_path.c_str()), false); 3087 add_nlist = false; 3088 m_nlist_idx_to_sym_idx[nlist_idx] = sym_idx - 1; 3089 } 3090 } else { 3091 // This could be a relative path to a N_SO 3092 N_SO_index = sym_idx; 3093 } 3094 } 3095 break; 3096 3097 case N_OSO: 3098 // object file name: name,,0,0,st_mtime 3099 type = eSymbolTypeObjectFile; 3100 break; 3101 3102 case N_LSYM: 3103 // local sym: name,,NO_SECT,type,offset 3104 type = eSymbolTypeLocal; 3105 break; 3106 3107 //---------------------------------------------------------------------- 3108 // INCL scopes 3109 //---------------------------------------------------------------------- 3110 case N_BINCL: 3111 // include file beginning: name,,NO_SECT,0,sum We use 3112 // the current number of symbols in the symbol table 3113 // in lieu of using nlist_idx in case we ever start 3114 // trimming entries out 3115 N_INCL_indexes.push_back(sym_idx); 3116 type = eSymbolTypeScopeBegin; 3117 break; 3118 3119 case N_EINCL: 3120 // include file end: name,,NO_SECT,0,0 3121 // Set the size of the N_BINCL to the terminating 3122 // index of this N_EINCL so that we can always skip 3123 // the entire symbol if we need to navigate more 3124 // quickly at the source level when parsing STABS 3125 if (!N_INCL_indexes.empty()) { 3126 symbol_ptr = 3127 symtab->SymbolAtIndex(N_INCL_indexes.back()); 3128 symbol_ptr->SetByteSize(sym_idx + 1); 3129 symbol_ptr->SetSizeIsSibling(true); 3130 N_INCL_indexes.pop_back(); 3131 } 3132 type = eSymbolTypeScopeEnd; 3133 break; 3134 3135 case N_SOL: 3136 // #included file name: name,,n_sect,0,address 3137 type = eSymbolTypeHeaderFile; 3138 3139 // We currently don't use the header files on darwin 3140 add_nlist = false; 3141 break; 3142 3143 case N_PARAMS: 3144 // compiler parameters: name,,NO_SECT,0,0 3145 type = eSymbolTypeCompiler; 3146 break; 3147 3148 case N_VERSION: 3149 // compiler version: name,,NO_SECT,0,0 3150 type = eSymbolTypeCompiler; 3151 break; 3152 3153 case N_OLEVEL: 3154 // compiler -O level: name,,NO_SECT,0,0 3155 type = eSymbolTypeCompiler; 3156 break; 3157 3158 case N_PSYM: 3159 // parameter: name,,NO_SECT,type,offset 3160 type = eSymbolTypeVariable; 3161 break; 3162 3163 case N_ENTRY: 3164 // alternate entry: name,,n_sect,linenumber,address 3165 symbol_section = section_info.GetSection( 3166 nlist.n_sect, nlist.n_value); 3167 type = eSymbolTypeLineEntry; 3168 break; 3169 3170 //---------------------------------------------------------------------- 3171 // Left and Right Braces 3172 //---------------------------------------------------------------------- 3173 case N_LBRAC: 3174 // left bracket: 0,,NO_SECT,nesting level,address We 3175 // use the current number of symbols in the symbol 3176 // table in lieu of using nlist_idx in case we ever 3177 // start trimming entries out 3178 symbol_section = section_info.GetSection( 3179 nlist.n_sect, nlist.n_value); 3180 N_BRAC_indexes.push_back(sym_idx); 3181 type = eSymbolTypeScopeBegin; 3182 break; 3183 3184 case N_RBRAC: 3185 // right bracket: 0,,NO_SECT,nesting level,address 3186 // Set the size of the N_LBRAC to the terminating 3187 // index of this N_RBRAC so that we can always skip 3188 // the entire symbol if we need to navigate more 3189 // quickly at the source level when parsing STABS 3190 symbol_section = section_info.GetSection( 3191 nlist.n_sect, nlist.n_value); 3192 if (!N_BRAC_indexes.empty()) { 3193 symbol_ptr = 3194 symtab->SymbolAtIndex(N_BRAC_indexes.back()); 3195 symbol_ptr->SetByteSize(sym_idx + 1); 3196 symbol_ptr->SetSizeIsSibling(true); 3197 N_BRAC_indexes.pop_back(); 3198 } 3199 type = eSymbolTypeScopeEnd; 3200 break; 3201 3202 case N_EXCL: 3203 // deleted include file: name,,NO_SECT,0,sum 3204 type = eSymbolTypeHeaderFile; 3205 break; 3206 3207 //---------------------------------------------------------------------- 3208 // COMM scopes 3209 //---------------------------------------------------------------------- 3210 case N_BCOMM: 3211 // begin common: name,,NO_SECT,0,0 3212 // We use the current number of symbols in the symbol 3213 // table in lieu of using nlist_idx in case we ever 3214 // start trimming entries out 3215 type = eSymbolTypeScopeBegin; 3216 N_COMM_indexes.push_back(sym_idx); 3217 break; 3218 3219 case N_ECOML: 3220 // end common (local name): 0,,n_sect,0,address 3221 symbol_section = section_info.GetSection( 3222 nlist.n_sect, nlist.n_value); 3223 // Fall through 3224 3225 case N_ECOMM: 3226 // end common: name,,n_sect,0,0 3227 // Set the size of the N_BCOMM to the terminating 3228 // index of this N_ECOMM/N_ECOML so that we can 3229 // always skip the entire symbol if we need to 3230 // navigate more quickly at the source level when 3231 // parsing STABS 3232 if (!N_COMM_indexes.empty()) { 3233 symbol_ptr = 3234 symtab->SymbolAtIndex(N_COMM_indexes.back()); 3235 symbol_ptr->SetByteSize(sym_idx + 1); 3236 symbol_ptr->SetSizeIsSibling(true); 3237 N_COMM_indexes.pop_back(); 3238 } 3239 type = eSymbolTypeScopeEnd; 3240 break; 3241 3242 case N_LENG: 3243 // second stab entry with length information 3244 type = eSymbolTypeAdditional; 3245 break; 3246 3247 default: 3248 break; 3249 } 3250 } else { 3251 // uint8_t n_pext = N_PEXT & nlist.n_type; 3252 uint8_t n_type = N_TYPE & nlist.n_type; 3253 sym[sym_idx].SetExternal((N_EXT & nlist.n_type) != 0); 3254 3255 switch (n_type) { 3256 case N_INDR: { 3257 const char *reexport_name_cstr = 3258 strtab_data.PeekCStr(nlist.n_value); 3259 if (reexport_name_cstr && reexport_name_cstr[0]) { 3260 type = eSymbolTypeReExported; 3261 ConstString reexport_name( 3262 reexport_name_cstr + 3263 ((reexport_name_cstr[0] == '_') ? 1 : 0)); 3264 sym[sym_idx].SetReExportedSymbolName(reexport_name); 3265 set_value = false; 3266 reexport_shlib_needs_fixup[sym_idx] = reexport_name; 3267 indirect_symbol_names.insert( 3268 ConstString(symbol_name + 3269 ((symbol_name[0] == '_') ? 1 : 0))); 3270 } else 3271 type = eSymbolTypeUndefined; 3272 } break; 3273 3274 case N_UNDF: 3275 if (symbol_name && symbol_name[0]) { 3276 ConstString undefined_name( 3277 symbol_name + 3278 ((symbol_name[0] == '_') ? 1 : 0)); 3279 undefined_name_to_desc[undefined_name] = 3280 nlist.n_desc; 3281 } 3282 // Fall through 3283 case N_PBUD: 3284 type = eSymbolTypeUndefined; 3285 break; 3286 3287 case N_ABS: 3288 type = eSymbolTypeAbsolute; 3289 break; 3290 3291 case N_SECT: { 3292 symbol_section = section_info.GetSection( 3293 nlist.n_sect, nlist.n_value); 3294 3295 if (symbol_section == NULL) { 3296 // TODO: warn about this? 3297 add_nlist = false; 3298 break; 3299 } 3300 3301 if (TEXT_eh_frame_sectID == nlist.n_sect) { 3302 type = eSymbolTypeException; 3303 } else { 3304 uint32_t section_type = 3305 symbol_section->Get() & SECTION_TYPE; 3306 3307 switch (section_type) { 3308 case S_CSTRING_LITERALS: 3309 type = eSymbolTypeData; 3310 break; // section with only literal C strings 3311 case S_4BYTE_LITERALS: 3312 type = eSymbolTypeData; 3313 break; // section with only 4 byte literals 3314 case S_8BYTE_LITERALS: 3315 type = eSymbolTypeData; 3316 break; // section with only 8 byte literals 3317 case S_LITERAL_POINTERS: 3318 type = eSymbolTypeTrampoline; 3319 break; // section with only pointers to literals 3320 case S_NON_LAZY_SYMBOL_POINTERS: 3321 type = eSymbolTypeTrampoline; 3322 break; // section with only non-lazy symbol 3323 // pointers 3324 case S_LAZY_SYMBOL_POINTERS: 3325 type = eSymbolTypeTrampoline; 3326 break; // section with only lazy symbol pointers 3327 case S_SYMBOL_STUBS: 3328 type = eSymbolTypeTrampoline; 3329 break; // section with only symbol stubs, byte 3330 // size of stub in the reserved2 field 3331 case S_MOD_INIT_FUNC_POINTERS: 3332 type = eSymbolTypeCode; 3333 break; // section with only function pointers for 3334 // initialization 3335 case S_MOD_TERM_FUNC_POINTERS: 3336 type = eSymbolTypeCode; 3337 break; // section with only function pointers for 3338 // termination 3339 case S_INTERPOSING: 3340 type = eSymbolTypeTrampoline; 3341 break; // section with only pairs of function 3342 // pointers for interposing 3343 case S_16BYTE_LITERALS: 3344 type = eSymbolTypeData; 3345 break; // section with only 16 byte literals 3346 case S_DTRACE_DOF: 3347 type = eSymbolTypeInstrumentation; 3348 break; 3349 case S_LAZY_DYLIB_SYMBOL_POINTERS: 3350 type = eSymbolTypeTrampoline; 3351 break; 3352 default: 3353 switch (symbol_section->GetType()) { 3354 case lldb::eSectionTypeCode: 3355 type = eSymbolTypeCode; 3356 break; 3357 case eSectionTypeData: 3358 case eSectionTypeDataCString: // Inlined C string 3359 // data 3360 case eSectionTypeDataCStringPointers: // Pointers 3361 // to C 3362 // string 3363 // data 3364 case eSectionTypeDataSymbolAddress: // Address of 3365 // a symbol in 3366 // the symbol 3367 // table 3368 case eSectionTypeData4: 3369 case eSectionTypeData8: 3370 case eSectionTypeData16: 3371 type = eSymbolTypeData; 3372 break; 3373 default: 3374 break; 3375 } 3376 break; 3377 } 3378 3379 if (type == eSymbolTypeInvalid) { 3380 const char *symbol_sect_name = 3381 symbol_section->GetName().AsCString(); 3382 if (symbol_section->IsDescendant( 3383 text_section_sp.get())) { 3384 if (symbol_section->IsClear( 3385 S_ATTR_PURE_INSTRUCTIONS | 3386 S_ATTR_SELF_MODIFYING_CODE | 3387 S_ATTR_SOME_INSTRUCTIONS)) 3388 type = eSymbolTypeData; 3389 else 3390 type = eSymbolTypeCode; 3391 } else if (symbol_section->IsDescendant( 3392 data_section_sp.get()) || 3393 symbol_section->IsDescendant( 3394 data_dirty_section_sp.get()) || 3395 symbol_section->IsDescendant( 3396 data_const_section_sp.get())) { 3397 if (symbol_sect_name && 3398 ::strstr(symbol_sect_name, "__objc") == 3399 symbol_sect_name) { 3400 type = eSymbolTypeRuntime; 3401 3402 if (symbol_name) { 3403 llvm::StringRef symbol_name_ref( 3404 symbol_name); 3405 if (symbol_name_ref.startswith("_OBJC_")) { 3406 static const llvm::StringRef 3407 g_objc_v2_prefix_class( 3408 "_OBJC_CLASS_$_"); 3409 static const llvm::StringRef 3410 g_objc_v2_prefix_metaclass( 3411 "_OBJC_METACLASS_$_"); 3412 static const llvm::StringRef 3413 g_objc_v2_prefix_ivar( 3414 "_OBJC_IVAR_$_"); 3415 if (symbol_name_ref.startswith( 3416 g_objc_v2_prefix_class)) { 3417 symbol_name_non_abi_mangled = 3418 symbol_name + 1; 3419 symbol_name = 3420 symbol_name + 3421 g_objc_v2_prefix_class.size(); 3422 type = eSymbolTypeObjCClass; 3423 demangled_is_synthesized = true; 3424 } else if ( 3425 symbol_name_ref.startswith( 3426 g_objc_v2_prefix_metaclass)) { 3427 symbol_name_non_abi_mangled = 3428 symbol_name + 1; 3429 symbol_name = 3430 symbol_name + 3431 g_objc_v2_prefix_metaclass.size(); 3432 type = eSymbolTypeObjCMetaClass; 3433 demangled_is_synthesized = true; 3434 } else if (symbol_name_ref.startswith( 3435 g_objc_v2_prefix_ivar)) { 3436 symbol_name_non_abi_mangled = 3437 symbol_name + 1; 3438 symbol_name = 3439 symbol_name + 3440 g_objc_v2_prefix_ivar.size(); 3441 type = eSymbolTypeObjCIVar; 3442 demangled_is_synthesized = true; 3443 } 3444 } 3445 } 3446 } else if (symbol_sect_name && 3447 ::strstr(symbol_sect_name, 3448 "__gcc_except_tab") == 3449 symbol_sect_name) { 3450 type = eSymbolTypeException; 3451 } else { 3452 type = eSymbolTypeData; 3453 } 3454 } else if (symbol_sect_name && 3455 ::strstr(symbol_sect_name, 3456 "__IMPORT") == 3457 symbol_sect_name) { 3458 type = eSymbolTypeTrampoline; 3459 } else if (symbol_section->IsDescendant( 3460 objc_section_sp.get())) { 3461 type = eSymbolTypeRuntime; 3462 if (symbol_name && symbol_name[0] == '.') { 3463 llvm::StringRef symbol_name_ref(symbol_name); 3464 static const llvm::StringRef 3465 g_objc_v1_prefix_class( 3466 ".objc_class_name_"); 3467 if (symbol_name_ref.startswith( 3468 g_objc_v1_prefix_class)) { 3469 symbol_name_non_abi_mangled = symbol_name; 3470 symbol_name = symbol_name + 3471 g_objc_v1_prefix_class.size(); 3472 type = eSymbolTypeObjCClass; 3473 demangled_is_synthesized = true; 3474 } 3475 } 3476 } 3477 } 3478 } 3479 } break; 3480 } 3481 } 3482 3483 if (add_nlist) { 3484 uint64_t symbol_value = nlist.n_value; 3485 if (symbol_name_non_abi_mangled) { 3486 sym[sym_idx].GetMangled().SetMangledName( 3487 ConstString(symbol_name_non_abi_mangled)); 3488 sym[sym_idx].GetMangled().SetDemangledName( 3489 ConstString(symbol_name)); 3490 } else { 3491 bool symbol_name_is_mangled = false; 3492 3493 if (symbol_name && symbol_name[0] == '_') { 3494 symbol_name_is_mangled = symbol_name[1] == '_'; 3495 symbol_name++; // Skip the leading underscore 3496 } 3497 3498 if (symbol_name) { 3499 ConstString const_symbol_name(symbol_name); 3500 sym[sym_idx].GetMangled().SetValue( 3501 const_symbol_name, symbol_name_is_mangled); 3502 if (is_gsym && is_debug) { 3503 const char *gsym_name = 3504 sym[sym_idx] 3505 .GetMangled() 3506 .GetName(lldb::eLanguageTypeUnknown, 3507 Mangled::ePreferMangled) 3508 .GetCString(); 3509 if (gsym_name) 3510 N_GSYM_name_to_sym_idx[gsym_name] = sym_idx; 3511 } 3512 } 3513 } 3514 if (symbol_section) { 3515 const addr_t section_file_addr = 3516 symbol_section->GetFileAddress(); 3517 if (symbol_byte_size == 0 && 3518 function_starts_count > 0) { 3519 addr_t symbol_lookup_file_addr = nlist.n_value; 3520 // Do an exact address match for non-ARM addresses, 3521 // else get the closest since the symbol might be a 3522 // thumb symbol which has an address with bit zero 3523 // set 3524 FunctionStarts::Entry *func_start_entry = 3525 function_starts.FindEntry( 3526 symbol_lookup_file_addr, !is_arm); 3527 if (is_arm && func_start_entry) { 3528 // Verify that the function start address is the 3529 // symbol address (ARM) or the symbol address + 1 3530 // (thumb) 3531 if (func_start_entry->addr != 3532 symbol_lookup_file_addr && 3533 func_start_entry->addr != 3534 (symbol_lookup_file_addr + 1)) { 3535 // Not the right entry, NULL it out... 3536 func_start_entry = NULL; 3537 } 3538 } 3539 if (func_start_entry) { 3540 func_start_entry->data = true; 3541 3542 addr_t symbol_file_addr = func_start_entry->addr; 3543 uint32_t symbol_flags = 0; 3544 if (is_arm) { 3545 if (symbol_file_addr & 1) 3546 symbol_flags = 3547 MACHO_NLIST_ARM_SYMBOL_IS_THUMB; 3548 symbol_file_addr &= THUMB_ADDRESS_BIT_MASK; 3549 } 3550 3551 const FunctionStarts::Entry 3552 *next_func_start_entry = 3553 function_starts.FindNextEntry( 3554 func_start_entry); 3555 const addr_t section_end_file_addr = 3556 section_file_addr + 3557 symbol_section->GetByteSize(); 3558 if (next_func_start_entry) { 3559 addr_t next_symbol_file_addr = 3560 next_func_start_entry->addr; 3561 // Be sure the clear the Thumb address bit when 3562 // we calculate the size from the current and 3563 // next address 3564 if (is_arm) 3565 next_symbol_file_addr &= 3566 THUMB_ADDRESS_BIT_MASK; 3567 symbol_byte_size = std::min<lldb::addr_t>( 3568 next_symbol_file_addr - symbol_file_addr, 3569 section_end_file_addr - symbol_file_addr); 3570 } else { 3571 symbol_byte_size = 3572 section_end_file_addr - symbol_file_addr; 3573 } 3574 } 3575 } 3576 symbol_value -= section_file_addr; 3577 } 3578 3579 if (is_debug == false) { 3580 if (type == eSymbolTypeCode) { 3581 // See if we can find a N_FUN entry for any code 3582 // symbols. If we do find a match, and the name 3583 // matches, then we can merge the two into just the 3584 // function symbol to avoid duplicate entries in 3585 // the symbol table 3586 std::pair<ValueToSymbolIndexMap::const_iterator, 3587 ValueToSymbolIndexMap::const_iterator> 3588 range; 3589 range = N_FUN_addr_to_sym_idx.equal_range( 3590 nlist.n_value); 3591 if (range.first != range.second) { 3592 bool found_it = false; 3593 for (ValueToSymbolIndexMap::const_iterator pos = 3594 range.first; 3595 pos != range.second; ++pos) { 3596 if (sym[sym_idx].GetMangled().GetName( 3597 lldb::eLanguageTypeUnknown, 3598 Mangled::ePreferMangled) == 3599 sym[pos->second].GetMangled().GetName( 3600 lldb::eLanguageTypeUnknown, 3601 Mangled::ePreferMangled)) { 3602 m_nlist_idx_to_sym_idx[nlist_idx] = 3603 pos->second; 3604 // We just need the flags from the linker 3605 // symbol, so put these flags 3606 // into the N_FUN flags to avoid duplicate 3607 // symbols in the symbol table 3608 sym[pos->second].SetExternal( 3609 sym[sym_idx].IsExternal()); 3610 sym[pos->second].SetFlags(nlist.n_type << 16 | 3611 nlist.n_desc); 3612 if (resolver_addresses.find(nlist.n_value) != 3613 resolver_addresses.end()) 3614 sym[pos->second].SetType( 3615 eSymbolTypeResolver); 3616 sym[sym_idx].Clear(); 3617 found_it = true; 3618 break; 3619 } 3620 } 3621 if (found_it) 3622 continue; 3623 } else { 3624 if (resolver_addresses.find(nlist.n_value) != 3625 resolver_addresses.end()) 3626 type = eSymbolTypeResolver; 3627 } 3628 } else if (type == eSymbolTypeData || 3629 type == eSymbolTypeObjCClass || 3630 type == eSymbolTypeObjCMetaClass || 3631 type == eSymbolTypeObjCIVar) { 3632 // See if we can find a N_STSYM entry for any data 3633 // symbols. If we do find a match, and the name 3634 // matches, then we can merge the two into just the 3635 // Static symbol to avoid duplicate entries in the 3636 // symbol table 3637 std::pair<ValueToSymbolIndexMap::const_iterator, 3638 ValueToSymbolIndexMap::const_iterator> 3639 range; 3640 range = N_STSYM_addr_to_sym_idx.equal_range( 3641 nlist.n_value); 3642 if (range.first != range.second) { 3643 bool found_it = false; 3644 for (ValueToSymbolIndexMap::const_iterator pos = 3645 range.first; 3646 pos != range.second; ++pos) { 3647 if (sym[sym_idx].GetMangled().GetName( 3648 lldb::eLanguageTypeUnknown, 3649 Mangled::ePreferMangled) == 3650 sym[pos->second].GetMangled().GetName( 3651 lldb::eLanguageTypeUnknown, 3652 Mangled::ePreferMangled)) { 3653 m_nlist_idx_to_sym_idx[nlist_idx] = 3654 pos->second; 3655 // We just need the flags from the linker 3656 // symbol, so put these flags 3657 // into the N_STSYM flags to avoid duplicate 3658 // symbols in the symbol table 3659 sym[pos->second].SetExternal( 3660 sym[sym_idx].IsExternal()); 3661 sym[pos->second].SetFlags(nlist.n_type << 16 | 3662 nlist.n_desc); 3663 sym[sym_idx].Clear(); 3664 found_it = true; 3665 break; 3666 } 3667 } 3668 if (found_it) 3669 continue; 3670 } else { 3671 const char *gsym_name = 3672 sym[sym_idx] 3673 .GetMangled() 3674 .GetName(lldb::eLanguageTypeUnknown, 3675 Mangled::ePreferMangled) 3676 .GetCString(); 3677 if (gsym_name) { 3678 // Combine N_GSYM stab entries with the non 3679 // stab symbol 3680 ConstNameToSymbolIndexMap::const_iterator pos = 3681 N_GSYM_name_to_sym_idx.find(gsym_name); 3682 if (pos != N_GSYM_name_to_sym_idx.end()) { 3683 const uint32_t GSYM_sym_idx = pos->second; 3684 m_nlist_idx_to_sym_idx[nlist_idx] = 3685 GSYM_sym_idx; 3686 // Copy the address, because often the N_GSYM 3687 // address has an invalid address of zero 3688 // when the global is a common symbol 3689 sym[GSYM_sym_idx].GetAddressRef().SetSection( 3690 symbol_section); 3691 sym[GSYM_sym_idx].GetAddressRef().SetOffset( 3692 symbol_value); 3693 // We just need the flags from the linker 3694 // symbol, so put these flags 3695 // into the N_GSYM flags to avoid duplicate 3696 // symbols in the symbol table 3697 sym[GSYM_sym_idx].SetFlags( 3698 nlist.n_type << 16 | nlist.n_desc); 3699 sym[sym_idx].Clear(); 3700 continue; 3701 } 3702 } 3703 } 3704 } 3705 } 3706 3707 sym[sym_idx].SetID(nlist_idx); 3708 sym[sym_idx].SetType(type); 3709 if (set_value) { 3710 sym[sym_idx].GetAddressRef().SetSection( 3711 symbol_section); 3712 sym[sym_idx].GetAddressRef().SetOffset(symbol_value); 3713 } 3714 sym[sym_idx].SetFlags(nlist.n_type << 16 | 3715 nlist.n_desc); 3716 3717 if (symbol_byte_size > 0) 3718 sym[sym_idx].SetByteSize(symbol_byte_size); 3719 3720 if (demangled_is_synthesized) 3721 sym[sym_idx].SetDemangledNameIsSynthesized(true); 3722 ++sym_idx; 3723 } else { 3724 sym[sym_idx].Clear(); 3725 } 3726 } 3727 ///////////////////////////// 3728 } 3729 break; // No more entries to consider 3730 } 3731 } 3732 3733 for (const auto &pos : reexport_shlib_needs_fixup) { 3734 const auto undef_pos = undefined_name_to_desc.find(pos.second); 3735 if (undef_pos != undefined_name_to_desc.end()) { 3736 const uint8_t dylib_ordinal = 3737 llvm::MachO::GET_LIBRARY_ORDINAL(undef_pos->second); 3738 if (dylib_ordinal > 0 && 3739 dylib_ordinal < dylib_files.GetSize()) 3740 sym[pos.first].SetReExportedSymbolSharedLibrary( 3741 dylib_files.GetFileSpecAtIndex(dylib_ordinal - 1)); 3742 } 3743 } 3744 } 3745 } 3746 } 3747 } 3748 } 3749 3750 // Must reset this in case it was mutated above! 3751 nlist_data_offset = 0; 3752 #endif 3753 3754 if (nlist_data.GetByteSize() > 0) { 3755 3756 // If the sym array was not created while parsing the DSC unmapped 3757 // symbols, create it now. 3758 if (sym == NULL) { 3759 sym = symtab->Resize(symtab_load_command.nsyms + 3760 m_dysymtab.nindirectsyms); 3761 num_syms = symtab->GetNumSymbols(); 3762 } 3763 3764 if (unmapped_local_symbols_found) { 3765 assert(m_dysymtab.ilocalsym == 0); 3766 nlist_data_offset += (m_dysymtab.nlocalsym * nlist_byte_size); 3767 nlist_idx = m_dysymtab.nlocalsym; 3768 } else { 3769 nlist_idx = 0; 3770 } 3771 3772 typedef std::map<ConstString, uint16_t> UndefinedNameToDescMap; 3773 typedef std::map<uint32_t, ConstString> SymbolIndexToName; 3774 UndefinedNameToDescMap undefined_name_to_desc; 3775 SymbolIndexToName reexport_shlib_needs_fixup; 3776 for (; nlist_idx < symtab_load_command.nsyms; ++nlist_idx) { 3777 struct nlist_64 nlist; 3778 if (!nlist_data.ValidOffsetForDataOfSize(nlist_data_offset, 3779 nlist_byte_size)) 3780 break; 3781 3782 nlist.n_strx = nlist_data.GetU32_unchecked(&nlist_data_offset); 3783 nlist.n_type = nlist_data.GetU8_unchecked(&nlist_data_offset); 3784 nlist.n_sect = nlist_data.GetU8_unchecked(&nlist_data_offset); 3785 nlist.n_desc = nlist_data.GetU16_unchecked(&nlist_data_offset); 3786 nlist.n_value = nlist_data.GetAddress_unchecked(&nlist_data_offset); 3787 3788 SymbolType type = eSymbolTypeInvalid; 3789 const char *symbol_name = NULL; 3790 3791 if (have_strtab_data) { 3792 symbol_name = strtab_data.PeekCStr(nlist.n_strx); 3793 3794 if (symbol_name == NULL) { 3795 // No symbol should be NULL, even the symbols with no string values 3796 // should have an offset zero which points to an empty C-string 3797 Host::SystemLog(Host::eSystemLogError, 3798 "error: symbol[%u] has invalid string table offset " 3799 "0x%x in %s, ignoring symbol\n", 3800 nlist_idx, nlist.n_strx, 3801 module_sp->GetFileSpec().GetPath().c_str()); 3802 continue; 3803 } 3804 if (symbol_name[0] == '\0') 3805 symbol_name = NULL; 3806 } else { 3807 const addr_t str_addr = strtab_addr + nlist.n_strx; 3808 Status str_error; 3809 if (process->ReadCStringFromMemory(str_addr, memory_symbol_name, 3810 str_error)) 3811 symbol_name = memory_symbol_name.c_str(); 3812 } 3813 const char *symbol_name_non_abi_mangled = NULL; 3814 3815 SectionSP symbol_section; 3816 lldb::addr_t symbol_byte_size = 0; 3817 bool add_nlist = true; 3818 bool is_gsym = false; 3819 bool is_debug = ((nlist.n_type & N_STAB) != 0); 3820 bool demangled_is_synthesized = false; 3821 bool set_value = true; 3822 assert(sym_idx < num_syms); 3823 3824 sym[sym_idx].SetDebug(is_debug); 3825 3826 if (is_debug) { 3827 switch (nlist.n_type) { 3828 case N_GSYM: 3829 // global symbol: name,,NO_SECT,type,0 3830 // Sometimes the N_GSYM value contains the address. 3831 3832 // FIXME: In the .o files, we have a GSYM and a debug symbol for all 3833 // the ObjC data. They 3834 // have the same address, but we want to ensure that we always find 3835 // only the real symbol, 'cause we don't currently correctly 3836 // attribute the GSYM one to the ObjCClass/Ivar/MetaClass symbol 3837 // type. This is a temporary hack to make sure the ObjectiveC 3838 // symbols get treated correctly. To do this right, we should 3839 // coalesce all the GSYM & global symbols that have the same 3840 // address. 3841 is_gsym = true; 3842 sym[sym_idx].SetExternal(true); 3843 3844 if (symbol_name && symbol_name[0] == '_' && symbol_name[1] == 'O') { 3845 llvm::StringRef symbol_name_ref(symbol_name); 3846 if (symbol_name_ref.startswith(g_objc_v2_prefix_class)) { 3847 symbol_name_non_abi_mangled = symbol_name + 1; 3848 symbol_name = symbol_name + g_objc_v2_prefix_class.size(); 3849 type = eSymbolTypeObjCClass; 3850 demangled_is_synthesized = true; 3851 3852 } else if (symbol_name_ref.startswith( 3853 g_objc_v2_prefix_metaclass)) { 3854 symbol_name_non_abi_mangled = symbol_name + 1; 3855 symbol_name = symbol_name + g_objc_v2_prefix_metaclass.size(); 3856 type = eSymbolTypeObjCMetaClass; 3857 demangled_is_synthesized = true; 3858 } else if (symbol_name_ref.startswith(g_objc_v2_prefix_ivar)) { 3859 symbol_name_non_abi_mangled = symbol_name + 1; 3860 symbol_name = symbol_name + g_objc_v2_prefix_ivar.size(); 3861 type = eSymbolTypeObjCIVar; 3862 demangled_is_synthesized = true; 3863 } 3864 } else { 3865 if (nlist.n_value != 0) 3866 symbol_section = 3867 section_info.GetSection(nlist.n_sect, nlist.n_value); 3868 type = eSymbolTypeData; 3869 } 3870 break; 3871 3872 case N_FNAME: 3873 // procedure name (f77 kludge): name,,NO_SECT,0,0 3874 type = eSymbolTypeCompiler; 3875 break; 3876 3877 case N_FUN: 3878 // procedure: name,,n_sect,linenumber,address 3879 if (symbol_name) { 3880 type = eSymbolTypeCode; 3881 symbol_section = 3882 section_info.GetSection(nlist.n_sect, nlist.n_value); 3883 3884 N_FUN_addr_to_sym_idx.insert( 3885 std::make_pair(nlist.n_value, sym_idx)); 3886 // We use the current number of symbols in the symbol table in 3887 // lieu of using nlist_idx in case we ever start trimming entries 3888 // out 3889 N_FUN_indexes.push_back(sym_idx); 3890 } else { 3891 type = eSymbolTypeCompiler; 3892 3893 if (!N_FUN_indexes.empty()) { 3894 // Copy the size of the function into the original STAB entry 3895 // so we don't have to hunt for it later 3896 symtab->SymbolAtIndex(N_FUN_indexes.back()) 3897 ->SetByteSize(nlist.n_value); 3898 N_FUN_indexes.pop_back(); 3899 // We don't really need the end function STAB as it contains 3900 // the size which we already placed with the original symbol, 3901 // so don't add it if we want a minimal symbol table 3902 add_nlist = false; 3903 } 3904 } 3905 break; 3906 3907 case N_STSYM: 3908 // static symbol: name,,n_sect,type,address 3909 N_STSYM_addr_to_sym_idx.insert( 3910 std::make_pair(nlist.n_value, sym_idx)); 3911 symbol_section = 3912 section_info.GetSection(nlist.n_sect, nlist.n_value); 3913 if (symbol_name && symbol_name[0]) { 3914 type = ObjectFile::GetSymbolTypeFromName(symbol_name + 1, 3915 eSymbolTypeData); 3916 } 3917 break; 3918 3919 case N_LCSYM: 3920 // .lcomm symbol: name,,n_sect,type,address 3921 symbol_section = 3922 section_info.GetSection(nlist.n_sect, nlist.n_value); 3923 type = eSymbolTypeCommonBlock; 3924 break; 3925 3926 case N_BNSYM: 3927 // We use the current number of symbols in the symbol table in lieu 3928 // of using nlist_idx in case we ever start trimming entries out 3929 // Skip these if we want minimal symbol tables 3930 add_nlist = false; 3931 break; 3932 3933 case N_ENSYM: 3934 // Set the size of the N_BNSYM to the terminating index of this 3935 // N_ENSYM so that we can always skip the entire symbol if we need 3936 // to navigate more quickly at the source level when parsing STABS 3937 // Skip these if we want minimal symbol tables 3938 add_nlist = false; 3939 break; 3940 3941 case N_OPT: 3942 // emitted with gcc2_compiled and in gcc source 3943 type = eSymbolTypeCompiler; 3944 break; 3945 3946 case N_RSYM: 3947 // register sym: name,,NO_SECT,type,register 3948 type = eSymbolTypeVariable; 3949 break; 3950 3951 case N_SLINE: 3952 // src line: 0,,n_sect,linenumber,address 3953 symbol_section = 3954 section_info.GetSection(nlist.n_sect, nlist.n_value); 3955 type = eSymbolTypeLineEntry; 3956 break; 3957 3958 case N_SSYM: 3959 // structure elt: name,,NO_SECT,type,struct_offset 3960 type = eSymbolTypeVariableType; 3961 break; 3962 3963 case N_SO: 3964 // source file name 3965 type = eSymbolTypeSourceFile; 3966 if (symbol_name == NULL) { 3967 add_nlist = false; 3968 if (N_SO_index != UINT32_MAX) { 3969 // Set the size of the N_SO to the terminating index of this 3970 // N_SO so that we can always skip the entire N_SO if we need 3971 // to navigate more quickly at the source level when parsing 3972 // STABS 3973 symbol_ptr = symtab->SymbolAtIndex(N_SO_index); 3974 symbol_ptr->SetByteSize(sym_idx); 3975 symbol_ptr->SetSizeIsSibling(true); 3976 } 3977 N_NSYM_indexes.clear(); 3978 N_INCL_indexes.clear(); 3979 N_BRAC_indexes.clear(); 3980 N_COMM_indexes.clear(); 3981 N_FUN_indexes.clear(); 3982 N_SO_index = UINT32_MAX; 3983 } else { 3984 // We use the current number of symbols in the symbol table in 3985 // lieu of using nlist_idx in case we ever start trimming entries 3986 // out 3987 const bool N_SO_has_full_path = symbol_name[0] == '/'; 3988 if (N_SO_has_full_path) { 3989 if ((N_SO_index == sym_idx - 1) && ((sym_idx - 1) < num_syms)) { 3990 // We have two consecutive N_SO entries where the first 3991 // contains a directory and the second contains a full path. 3992 sym[sym_idx - 1].GetMangled().SetValue( 3993 ConstString(symbol_name), false); 3994 m_nlist_idx_to_sym_idx[nlist_idx] = sym_idx - 1; 3995 add_nlist = false; 3996 } else { 3997 // This is the first entry in a N_SO that contains a 3998 // directory or a full path to the source file 3999 N_SO_index = sym_idx; 4000 } 4001 } else if ((N_SO_index == sym_idx - 1) && 4002 ((sym_idx - 1) < num_syms)) { 4003 // This is usually the second N_SO entry that contains just the 4004 // filename, so here we combine it with the first one if we are 4005 // minimizing the symbol table 4006 const char *so_path = 4007 sym[sym_idx - 1] 4008 .GetMangled() 4009 .GetDemangledName(lldb::eLanguageTypeUnknown) 4010 .AsCString(); 4011 if (so_path && so_path[0]) { 4012 std::string full_so_path(so_path); 4013 const size_t double_slash_pos = full_so_path.find("//"); 4014 if (double_slash_pos != std::string::npos) { 4015 // The linker has been generating bad N_SO entries with 4016 // doubled up paths in the format "%s%s" where the first 4017 // string in the DW_AT_comp_dir, and the second is the 4018 // directory for the source file so you end up with a path 4019 // that looks like "/tmp/src//tmp/src/" 4020 FileSpec so_dir(so_path); 4021 if (!FileSystem::Instance().Exists(so_dir)) { 4022 so_dir.SetFile(&full_so_path[double_slash_pos + 1], 4023 FileSpec::Style::native); 4024 if (FileSystem::Instance().Exists(so_dir)) { 4025 // Trim off the incorrect path 4026 full_so_path.erase(0, double_slash_pos + 1); 4027 } 4028 } 4029 } 4030 if (*full_so_path.rbegin() != '/') 4031 full_so_path += '/'; 4032 full_so_path += symbol_name; 4033 sym[sym_idx - 1].GetMangled().SetValue( 4034 ConstString(full_so_path.c_str()), false); 4035 add_nlist = false; 4036 m_nlist_idx_to_sym_idx[nlist_idx] = sym_idx - 1; 4037 } 4038 } else { 4039 // This could be a relative path to a N_SO 4040 N_SO_index = sym_idx; 4041 } 4042 } 4043 break; 4044 4045 case N_OSO: 4046 // object file name: name,,0,0,st_mtime 4047 type = eSymbolTypeObjectFile; 4048 break; 4049 4050 case N_LSYM: 4051 // local sym: name,,NO_SECT,type,offset 4052 type = eSymbolTypeLocal; 4053 break; 4054 4055 //---------------------------------------------------------------------- 4056 // INCL scopes 4057 //---------------------------------------------------------------------- 4058 case N_BINCL: 4059 // include file beginning: name,,NO_SECT,0,sum We use the current 4060 // number of symbols in the symbol table in lieu of using nlist_idx 4061 // in case we ever start trimming entries out 4062 N_INCL_indexes.push_back(sym_idx); 4063 type = eSymbolTypeScopeBegin; 4064 break; 4065 4066 case N_EINCL: 4067 // include file end: name,,NO_SECT,0,0 4068 // Set the size of the N_BINCL to the terminating index of this 4069 // N_EINCL so that we can always skip the entire symbol if we need 4070 // to navigate more quickly at the source level when parsing STABS 4071 if (!N_INCL_indexes.empty()) { 4072 symbol_ptr = symtab->SymbolAtIndex(N_INCL_indexes.back()); 4073 symbol_ptr->SetByteSize(sym_idx + 1); 4074 symbol_ptr->SetSizeIsSibling(true); 4075 N_INCL_indexes.pop_back(); 4076 } 4077 type = eSymbolTypeScopeEnd; 4078 break; 4079 4080 case N_SOL: 4081 // #included file name: name,,n_sect,0,address 4082 type = eSymbolTypeHeaderFile; 4083 4084 // We currently don't use the header files on darwin 4085 add_nlist = false; 4086 break; 4087 4088 case N_PARAMS: 4089 // compiler parameters: name,,NO_SECT,0,0 4090 type = eSymbolTypeCompiler; 4091 break; 4092 4093 case N_VERSION: 4094 // compiler version: name,,NO_SECT,0,0 4095 type = eSymbolTypeCompiler; 4096 break; 4097 4098 case N_OLEVEL: 4099 // compiler -O level: name,,NO_SECT,0,0 4100 type = eSymbolTypeCompiler; 4101 break; 4102 4103 case N_PSYM: 4104 // parameter: name,,NO_SECT,type,offset 4105 type = eSymbolTypeVariable; 4106 break; 4107 4108 case N_ENTRY: 4109 // alternate entry: name,,n_sect,linenumber,address 4110 symbol_section = 4111 section_info.GetSection(nlist.n_sect, nlist.n_value); 4112 type = eSymbolTypeLineEntry; 4113 break; 4114 4115 //---------------------------------------------------------------------- 4116 // Left and Right Braces 4117 //---------------------------------------------------------------------- 4118 case N_LBRAC: 4119 // left bracket: 0,,NO_SECT,nesting level,address We use the 4120 // current number of symbols in the symbol table in lieu of using 4121 // nlist_idx in case we ever start trimming entries out 4122 symbol_section = 4123 section_info.GetSection(nlist.n_sect, nlist.n_value); 4124 N_BRAC_indexes.push_back(sym_idx); 4125 type = eSymbolTypeScopeBegin; 4126 break; 4127 4128 case N_RBRAC: 4129 // right bracket: 0,,NO_SECT,nesting level,address Set the size of 4130 // the N_LBRAC to the terminating index of this N_RBRAC so that we 4131 // can always skip the entire symbol if we need to navigate more 4132 // quickly at the source level when parsing STABS 4133 symbol_section = 4134 section_info.GetSection(nlist.n_sect, nlist.n_value); 4135 if (!N_BRAC_indexes.empty()) { 4136 symbol_ptr = symtab->SymbolAtIndex(N_BRAC_indexes.back()); 4137 symbol_ptr->SetByteSize(sym_idx + 1); 4138 symbol_ptr->SetSizeIsSibling(true); 4139 N_BRAC_indexes.pop_back(); 4140 } 4141 type = eSymbolTypeScopeEnd; 4142 break; 4143 4144 case N_EXCL: 4145 // deleted include file: name,,NO_SECT,0,sum 4146 type = eSymbolTypeHeaderFile; 4147 break; 4148 4149 //---------------------------------------------------------------------- 4150 // COMM scopes 4151 //---------------------------------------------------------------------- 4152 case N_BCOMM: 4153 // begin common: name,,NO_SECT,0,0 4154 // We use the current number of symbols in the symbol table in lieu 4155 // of using nlist_idx in case we ever start trimming entries out 4156 type = eSymbolTypeScopeBegin; 4157 N_COMM_indexes.push_back(sym_idx); 4158 break; 4159 4160 case N_ECOML: 4161 // end common (local name): 0,,n_sect,0,address 4162 symbol_section = 4163 section_info.GetSection(nlist.n_sect, nlist.n_value); 4164 LLVM_FALLTHROUGH; 4165 4166 case N_ECOMM: 4167 // end common: name,,n_sect,0,0 4168 // Set the size of the N_BCOMM to the terminating index of this 4169 // N_ECOMM/N_ECOML so that we can always skip the entire symbol if 4170 // we need to navigate more quickly at the source level when 4171 // parsing STABS 4172 if (!N_COMM_indexes.empty()) { 4173 symbol_ptr = symtab->SymbolAtIndex(N_COMM_indexes.back()); 4174 symbol_ptr->SetByteSize(sym_idx + 1); 4175 symbol_ptr->SetSizeIsSibling(true); 4176 N_COMM_indexes.pop_back(); 4177 } 4178 type = eSymbolTypeScopeEnd; 4179 break; 4180 4181 case N_LENG: 4182 // second stab entry with length information 4183 type = eSymbolTypeAdditional; 4184 break; 4185 4186 default: 4187 break; 4188 } 4189 } else { 4190 // uint8_t n_pext = N_PEXT & nlist.n_type; 4191 uint8_t n_type = N_TYPE & nlist.n_type; 4192 sym[sym_idx].SetExternal((N_EXT & nlist.n_type) != 0); 4193 4194 switch (n_type) { 4195 case N_INDR: { 4196 const char *reexport_name_cstr = 4197 strtab_data.PeekCStr(nlist.n_value); 4198 if (reexport_name_cstr && reexport_name_cstr[0]) { 4199 type = eSymbolTypeReExported; 4200 ConstString reexport_name( 4201 reexport_name_cstr + 4202 ((reexport_name_cstr[0] == '_') ? 1 : 0)); 4203 sym[sym_idx].SetReExportedSymbolName(reexport_name); 4204 set_value = false; 4205 reexport_shlib_needs_fixup[sym_idx] = reexport_name; 4206 indirect_symbol_names.insert( 4207 ConstString(symbol_name + ((symbol_name[0] == '_') ? 1 : 0))); 4208 } else 4209 type = eSymbolTypeUndefined; 4210 } break; 4211 4212 case N_UNDF: 4213 if (symbol_name && symbol_name[0]) { 4214 ConstString undefined_name(symbol_name + 4215 ((symbol_name[0] == '_') ? 1 : 0)); 4216 undefined_name_to_desc[undefined_name] = nlist.n_desc; 4217 } 4218 LLVM_FALLTHROUGH; 4219 4220 case N_PBUD: 4221 type = eSymbolTypeUndefined; 4222 break; 4223 4224 case N_ABS: 4225 type = eSymbolTypeAbsolute; 4226 break; 4227 4228 case N_SECT: { 4229 symbol_section = 4230 section_info.GetSection(nlist.n_sect, nlist.n_value); 4231 4232 if (!symbol_section) { 4233 // TODO: warn about this? 4234 add_nlist = false; 4235 break; 4236 } 4237 4238 if (TEXT_eh_frame_sectID == nlist.n_sect) { 4239 type = eSymbolTypeException; 4240 } else { 4241 uint32_t section_type = symbol_section->Get() & SECTION_TYPE; 4242 4243 switch (section_type) { 4244 case S_CSTRING_LITERALS: 4245 type = eSymbolTypeData; 4246 break; // section with only literal C strings 4247 case S_4BYTE_LITERALS: 4248 type = eSymbolTypeData; 4249 break; // section with only 4 byte literals 4250 case S_8BYTE_LITERALS: 4251 type = eSymbolTypeData; 4252 break; // section with only 8 byte literals 4253 case S_LITERAL_POINTERS: 4254 type = eSymbolTypeTrampoline; 4255 break; // section with only pointers to literals 4256 case S_NON_LAZY_SYMBOL_POINTERS: 4257 type = eSymbolTypeTrampoline; 4258 break; // section with only non-lazy symbol pointers 4259 case S_LAZY_SYMBOL_POINTERS: 4260 type = eSymbolTypeTrampoline; 4261 break; // section with only lazy symbol pointers 4262 case S_SYMBOL_STUBS: 4263 type = eSymbolTypeTrampoline; 4264 break; // section with only symbol stubs, byte size of stub in 4265 // the reserved2 field 4266 case S_MOD_INIT_FUNC_POINTERS: 4267 type = eSymbolTypeCode; 4268 break; // section with only function pointers for initialization 4269 case S_MOD_TERM_FUNC_POINTERS: 4270 type = eSymbolTypeCode; 4271 break; // section with only function pointers for termination 4272 case S_INTERPOSING: 4273 type = eSymbolTypeTrampoline; 4274 break; // section with only pairs of function pointers for 4275 // interposing 4276 case S_16BYTE_LITERALS: 4277 type = eSymbolTypeData; 4278 break; // section with only 16 byte literals 4279 case S_DTRACE_DOF: 4280 type = eSymbolTypeInstrumentation; 4281 break; 4282 case S_LAZY_DYLIB_SYMBOL_POINTERS: 4283 type = eSymbolTypeTrampoline; 4284 break; 4285 default: 4286 switch (symbol_section->GetType()) { 4287 case lldb::eSectionTypeCode: 4288 type = eSymbolTypeCode; 4289 break; 4290 case eSectionTypeData: 4291 case eSectionTypeDataCString: // Inlined C string data 4292 case eSectionTypeDataCStringPointers: // Pointers to C string 4293 // data 4294 case eSectionTypeDataSymbolAddress: // Address of a symbol in 4295 // the symbol table 4296 case eSectionTypeData4: 4297 case eSectionTypeData8: 4298 case eSectionTypeData16: 4299 type = eSymbolTypeData; 4300 break; 4301 default: 4302 break; 4303 } 4304 break; 4305 } 4306 4307 if (type == eSymbolTypeInvalid) { 4308 const char *symbol_sect_name = 4309 symbol_section->GetName().AsCString(); 4310 if (symbol_section->IsDescendant(text_section_sp.get())) { 4311 if (symbol_section->IsClear(S_ATTR_PURE_INSTRUCTIONS | 4312 S_ATTR_SELF_MODIFYING_CODE | 4313 S_ATTR_SOME_INSTRUCTIONS)) 4314 type = eSymbolTypeData; 4315 else 4316 type = eSymbolTypeCode; 4317 } else if (symbol_section->IsDescendant( 4318 data_section_sp.get()) || 4319 symbol_section->IsDescendant( 4320 data_dirty_section_sp.get()) || 4321 symbol_section->IsDescendant( 4322 data_const_section_sp.get())) { 4323 if (symbol_sect_name && 4324 ::strstr(symbol_sect_name, "__objc") == 4325 symbol_sect_name) { 4326 type = eSymbolTypeRuntime; 4327 4328 if (symbol_name) { 4329 llvm::StringRef symbol_name_ref(symbol_name); 4330 if (symbol_name_ref.startswith("_OBJC_")) { 4331 static const llvm::StringRef g_objc_v2_prefix_class( 4332 "_OBJC_CLASS_$_"); 4333 static const llvm::StringRef g_objc_v2_prefix_metaclass( 4334 "_OBJC_METACLASS_$_"); 4335 static const llvm::StringRef g_objc_v2_prefix_ivar( 4336 "_OBJC_IVAR_$_"); 4337 if (symbol_name_ref.startswith( 4338 g_objc_v2_prefix_class)) { 4339 symbol_name_non_abi_mangled = symbol_name + 1; 4340 symbol_name = 4341 symbol_name + g_objc_v2_prefix_class.size(); 4342 type = eSymbolTypeObjCClass; 4343 demangled_is_synthesized = true; 4344 } else if (symbol_name_ref.startswith( 4345 g_objc_v2_prefix_metaclass)) { 4346 symbol_name_non_abi_mangled = symbol_name + 1; 4347 symbol_name = 4348 symbol_name + g_objc_v2_prefix_metaclass.size(); 4349 type = eSymbolTypeObjCMetaClass; 4350 demangled_is_synthesized = true; 4351 } else if (symbol_name_ref.startswith( 4352 g_objc_v2_prefix_ivar)) { 4353 symbol_name_non_abi_mangled = symbol_name + 1; 4354 symbol_name = 4355 symbol_name + g_objc_v2_prefix_ivar.size(); 4356 type = eSymbolTypeObjCIVar; 4357 demangled_is_synthesized = true; 4358 } 4359 } 4360 } 4361 } else if (symbol_sect_name && 4362 ::strstr(symbol_sect_name, "__gcc_except_tab") == 4363 symbol_sect_name) { 4364 type = eSymbolTypeException; 4365 } else { 4366 type = eSymbolTypeData; 4367 } 4368 } else if (symbol_sect_name && 4369 ::strstr(symbol_sect_name, "__IMPORT") == 4370 symbol_sect_name) { 4371 type = eSymbolTypeTrampoline; 4372 } else if (symbol_section->IsDescendant( 4373 objc_section_sp.get())) { 4374 type = eSymbolTypeRuntime; 4375 if (symbol_name && symbol_name[0] == '.') { 4376 llvm::StringRef symbol_name_ref(symbol_name); 4377 static const llvm::StringRef g_objc_v1_prefix_class( 4378 ".objc_class_name_"); 4379 if (symbol_name_ref.startswith(g_objc_v1_prefix_class)) { 4380 symbol_name_non_abi_mangled = symbol_name; 4381 symbol_name = symbol_name + g_objc_v1_prefix_class.size(); 4382 type = eSymbolTypeObjCClass; 4383 demangled_is_synthesized = true; 4384 } 4385 } 4386 } 4387 } 4388 } 4389 } break; 4390 } 4391 } 4392 4393 if (add_nlist) { 4394 uint64_t symbol_value = nlist.n_value; 4395 4396 if (symbol_name_non_abi_mangled) { 4397 sym[sym_idx].GetMangled().SetMangledName( 4398 ConstString(symbol_name_non_abi_mangled)); 4399 sym[sym_idx].GetMangled().SetDemangledName( 4400 ConstString(symbol_name)); 4401 } else { 4402 bool symbol_name_is_mangled = false; 4403 4404 if (symbol_name && symbol_name[0] == '_') { 4405 symbol_name_is_mangled = symbol_name[1] == '_'; 4406 symbol_name++; // Skip the leading underscore 4407 } 4408 4409 if (symbol_name) { 4410 ConstString const_symbol_name(symbol_name); 4411 sym[sym_idx].GetMangled().SetValue(const_symbol_name, 4412 symbol_name_is_mangled); 4413 } 4414 } 4415 4416 if (is_gsym) { 4417 const char *gsym_name = sym[sym_idx] 4418 .GetMangled() 4419 .GetName(lldb::eLanguageTypeUnknown, 4420 Mangled::ePreferMangled) 4421 .GetCString(); 4422 if (gsym_name) 4423 N_GSYM_name_to_sym_idx[gsym_name] = sym_idx; 4424 } 4425 4426 if (symbol_section) { 4427 const addr_t section_file_addr = symbol_section->GetFileAddress(); 4428 if (symbol_byte_size == 0 && function_starts_count > 0) { 4429 addr_t symbol_lookup_file_addr = nlist.n_value; 4430 // Do an exact address match for non-ARM addresses, else get the 4431 // closest since the symbol might be a thumb symbol which has an 4432 // address with bit zero set 4433 FunctionStarts::Entry *func_start_entry = 4434 function_starts.FindEntry(symbol_lookup_file_addr, !is_arm); 4435 if (is_arm && func_start_entry) { 4436 // Verify that the function start address is the symbol address 4437 // (ARM) or the symbol address + 1 (thumb) 4438 if (func_start_entry->addr != symbol_lookup_file_addr && 4439 func_start_entry->addr != (symbol_lookup_file_addr + 1)) { 4440 // Not the right entry, NULL it out... 4441 func_start_entry = NULL; 4442 } 4443 } 4444 if (func_start_entry) { 4445 func_start_entry->data = true; 4446 4447 addr_t symbol_file_addr = func_start_entry->addr; 4448 if (is_arm) 4449 symbol_file_addr &= THUMB_ADDRESS_BIT_MASK; 4450 4451 const FunctionStarts::Entry *next_func_start_entry = 4452 function_starts.FindNextEntry(func_start_entry); 4453 const addr_t section_end_file_addr = 4454 section_file_addr + symbol_section->GetByteSize(); 4455 if (next_func_start_entry) { 4456 addr_t next_symbol_file_addr = next_func_start_entry->addr; 4457 // Be sure the clear the Thumb address bit when we calculate 4458 // the size from the current and next address 4459 if (is_arm) 4460 next_symbol_file_addr &= THUMB_ADDRESS_BIT_MASK; 4461 symbol_byte_size = std::min<lldb::addr_t>( 4462 next_symbol_file_addr - symbol_file_addr, 4463 section_end_file_addr - symbol_file_addr); 4464 } else { 4465 symbol_byte_size = section_end_file_addr - symbol_file_addr; 4466 } 4467 } 4468 } 4469 symbol_value -= section_file_addr; 4470 } 4471 4472 if (!is_debug) { 4473 if (type == eSymbolTypeCode) { 4474 // See if we can find a N_FUN entry for any code symbols. If we 4475 // do find a match, and the name matches, then we can merge the 4476 // two into just the function symbol to avoid duplicate entries 4477 // in the symbol table 4478 std::pair<ValueToSymbolIndexMap::const_iterator, 4479 ValueToSymbolIndexMap::const_iterator> 4480 range; 4481 range = N_FUN_addr_to_sym_idx.equal_range(nlist.n_value); 4482 if (range.first != range.second) { 4483 bool found_it = false; 4484 for (ValueToSymbolIndexMap::const_iterator pos = range.first; 4485 pos != range.second; ++pos) { 4486 if (sym[sym_idx].GetMangled().GetName( 4487 lldb::eLanguageTypeUnknown, 4488 Mangled::ePreferMangled) == 4489 sym[pos->second].GetMangled().GetName( 4490 lldb::eLanguageTypeUnknown, 4491 Mangled::ePreferMangled)) { 4492 m_nlist_idx_to_sym_idx[nlist_idx] = pos->second; 4493 // We just need the flags from the linker symbol, so put 4494 // these flags into the N_FUN flags to avoid duplicate 4495 // symbols in the symbol table 4496 sym[pos->second].SetExternal(sym[sym_idx].IsExternal()); 4497 sym[pos->second].SetFlags(nlist.n_type << 16 | 4498 nlist.n_desc); 4499 if (resolver_addresses.find(nlist.n_value) != 4500 resolver_addresses.end()) 4501 sym[pos->second].SetType(eSymbolTypeResolver); 4502 sym[sym_idx].Clear(); 4503 found_it = true; 4504 break; 4505 } 4506 } 4507 if (found_it) 4508 continue; 4509 } else { 4510 if (resolver_addresses.find(nlist.n_value) != 4511 resolver_addresses.end()) 4512 type = eSymbolTypeResolver; 4513 } 4514 } else if (type == eSymbolTypeData || 4515 type == eSymbolTypeObjCClass || 4516 type == eSymbolTypeObjCMetaClass || 4517 type == eSymbolTypeObjCIVar) { 4518 // See if we can find a N_STSYM entry for any data symbols. If we 4519 // do find a match, and the name matches, then we can merge the 4520 // two into just the Static symbol to avoid duplicate entries in 4521 // the symbol table 4522 std::pair<ValueToSymbolIndexMap::const_iterator, 4523 ValueToSymbolIndexMap::const_iterator> 4524 range; 4525 range = N_STSYM_addr_to_sym_idx.equal_range(nlist.n_value); 4526 if (range.first != range.second) { 4527 bool found_it = false; 4528 for (ValueToSymbolIndexMap::const_iterator pos = range.first; 4529 pos != range.second; ++pos) { 4530 if (sym[sym_idx].GetMangled().GetName( 4531 lldb::eLanguageTypeUnknown, 4532 Mangled::ePreferMangled) == 4533 sym[pos->second].GetMangled().GetName( 4534 lldb::eLanguageTypeUnknown, 4535 Mangled::ePreferMangled)) { 4536 m_nlist_idx_to_sym_idx[nlist_idx] = pos->second; 4537 // We just need the flags from the linker symbol, so put 4538 // these flags into the N_STSYM flags to avoid duplicate 4539 // symbols in the symbol table 4540 sym[pos->second].SetExternal(sym[sym_idx].IsExternal()); 4541 sym[pos->second].SetFlags(nlist.n_type << 16 | 4542 nlist.n_desc); 4543 sym[sym_idx].Clear(); 4544 found_it = true; 4545 break; 4546 } 4547 } 4548 if (found_it) 4549 continue; 4550 } else { 4551 // Combine N_GSYM stab entries with the non stab symbol 4552 const char *gsym_name = sym[sym_idx] 4553 .GetMangled() 4554 .GetName(lldb::eLanguageTypeUnknown, 4555 Mangled::ePreferMangled) 4556 .GetCString(); 4557 if (gsym_name) { 4558 ConstNameToSymbolIndexMap::const_iterator pos = 4559 N_GSYM_name_to_sym_idx.find(gsym_name); 4560 if (pos != N_GSYM_name_to_sym_idx.end()) { 4561 const uint32_t GSYM_sym_idx = pos->second; 4562 m_nlist_idx_to_sym_idx[nlist_idx] = GSYM_sym_idx; 4563 // Copy the address, because often the N_GSYM address has 4564 // an invalid address of zero when the global is a common 4565 // symbol 4566 sym[GSYM_sym_idx].GetAddressRef().SetSection( 4567 symbol_section); 4568 sym[GSYM_sym_idx].GetAddressRef().SetOffset(symbol_value); 4569 // We just need the flags from the linker symbol, so put 4570 // these flags into the N_GSYM flags to avoid duplicate 4571 // symbols in the symbol table 4572 sym[GSYM_sym_idx].SetFlags(nlist.n_type << 16 | 4573 nlist.n_desc); 4574 sym[sym_idx].Clear(); 4575 continue; 4576 } 4577 } 4578 } 4579 } 4580 } 4581 4582 sym[sym_idx].SetID(nlist_idx); 4583 sym[sym_idx].SetType(type); 4584 if (set_value) { 4585 sym[sym_idx].GetAddressRef().SetSection(symbol_section); 4586 sym[sym_idx].GetAddressRef().SetOffset(symbol_value); 4587 } 4588 sym[sym_idx].SetFlags(nlist.n_type << 16 | nlist.n_desc); 4589 4590 if (symbol_byte_size > 0) 4591 sym[sym_idx].SetByteSize(symbol_byte_size); 4592 4593 if (demangled_is_synthesized) 4594 sym[sym_idx].SetDemangledNameIsSynthesized(true); 4595 4596 ++sym_idx; 4597 } else { 4598 sym[sym_idx].Clear(); 4599 } 4600 } 4601 4602 for (const auto &pos : reexport_shlib_needs_fixup) { 4603 const auto undef_pos = undefined_name_to_desc.find(pos.second); 4604 if (undef_pos != undefined_name_to_desc.end()) { 4605 const uint8_t dylib_ordinal = 4606 llvm::MachO::GET_LIBRARY_ORDINAL(undef_pos->second); 4607 if (dylib_ordinal > 0 && dylib_ordinal < dylib_files.GetSize()) 4608 sym[pos.first].SetReExportedSymbolSharedLibrary( 4609 dylib_files.GetFileSpecAtIndex(dylib_ordinal - 1)); 4610 } 4611 } 4612 } 4613 4614 uint32_t synthetic_sym_id = symtab_load_command.nsyms; 4615 4616 if (function_starts_count > 0) { 4617 uint32_t num_synthetic_function_symbols = 0; 4618 for (i = 0; i < function_starts_count; ++i) { 4619 if (!function_starts.GetEntryRef(i).data) 4620 ++num_synthetic_function_symbols; 4621 } 4622 4623 if (num_synthetic_function_symbols > 0) { 4624 if (num_syms < sym_idx + num_synthetic_function_symbols) { 4625 num_syms = sym_idx + num_synthetic_function_symbols; 4626 sym = symtab->Resize(num_syms); 4627 } 4628 for (i = 0; i < function_starts_count; ++i) { 4629 const FunctionStarts::Entry *func_start_entry = 4630 function_starts.GetEntryAtIndex(i); 4631 if (!func_start_entry->data) { 4632 addr_t symbol_file_addr = func_start_entry->addr; 4633 uint32_t symbol_flags = 0; 4634 if (is_arm) { 4635 if (symbol_file_addr & 1) 4636 symbol_flags = MACHO_NLIST_ARM_SYMBOL_IS_THUMB; 4637 symbol_file_addr &= THUMB_ADDRESS_BIT_MASK; 4638 } 4639 Address symbol_addr; 4640 if (module_sp->ResolveFileAddress(symbol_file_addr, symbol_addr)) { 4641 SectionSP symbol_section(symbol_addr.GetSection()); 4642 uint32_t symbol_byte_size = 0; 4643 if (symbol_section) { 4644 const addr_t section_file_addr = 4645 symbol_section->GetFileAddress(); 4646 const FunctionStarts::Entry *next_func_start_entry = 4647 function_starts.FindNextEntry(func_start_entry); 4648 const addr_t section_end_file_addr = 4649 section_file_addr + symbol_section->GetByteSize(); 4650 if (next_func_start_entry) { 4651 addr_t next_symbol_file_addr = next_func_start_entry->addr; 4652 if (is_arm) 4653 next_symbol_file_addr &= THUMB_ADDRESS_BIT_MASK; 4654 symbol_byte_size = std::min<lldb::addr_t>( 4655 next_symbol_file_addr - symbol_file_addr, 4656 section_end_file_addr - symbol_file_addr); 4657 } else { 4658 symbol_byte_size = section_end_file_addr - symbol_file_addr; 4659 } 4660 sym[sym_idx].SetID(synthetic_sym_id++); 4661 sym[sym_idx].GetMangled().SetDemangledName( 4662 GetNextSyntheticSymbolName()); 4663 sym[sym_idx].SetType(eSymbolTypeCode); 4664 sym[sym_idx].SetIsSynthetic(true); 4665 sym[sym_idx].GetAddressRef() = symbol_addr; 4666 if (symbol_flags) 4667 sym[sym_idx].SetFlags(symbol_flags); 4668 if (symbol_byte_size) 4669 sym[sym_idx].SetByteSize(symbol_byte_size); 4670 ++sym_idx; 4671 } 4672 } 4673 } 4674 } 4675 } 4676 } 4677 4678 // Trim our symbols down to just what we ended up with after removing any 4679 // symbols. 4680 if (sym_idx < num_syms) { 4681 num_syms = sym_idx; 4682 sym = symtab->Resize(num_syms); 4683 } 4684 4685 // Now synthesize indirect symbols 4686 if (m_dysymtab.nindirectsyms != 0) { 4687 if (indirect_symbol_index_data.GetByteSize()) { 4688 NListIndexToSymbolIndexMap::const_iterator end_index_pos = 4689 m_nlist_idx_to_sym_idx.end(); 4690 4691 for (uint32_t sect_idx = 1; sect_idx < m_mach_sections.size(); 4692 ++sect_idx) { 4693 if ((m_mach_sections[sect_idx].flags & SECTION_TYPE) == 4694 S_SYMBOL_STUBS) { 4695 uint32_t symbol_stub_byte_size = 4696 m_mach_sections[sect_idx].reserved2; 4697 if (symbol_stub_byte_size == 0) 4698 continue; 4699 4700 const uint32_t num_symbol_stubs = 4701 m_mach_sections[sect_idx].size / symbol_stub_byte_size; 4702 4703 if (num_symbol_stubs == 0) 4704 continue; 4705 4706 const uint32_t symbol_stub_index_offset = 4707 m_mach_sections[sect_idx].reserved1; 4708 for (uint32_t stub_idx = 0; stub_idx < num_symbol_stubs; 4709 ++stub_idx) { 4710 const uint32_t symbol_stub_index = 4711 symbol_stub_index_offset + stub_idx; 4712 const lldb::addr_t symbol_stub_addr = 4713 m_mach_sections[sect_idx].addr + 4714 (stub_idx * symbol_stub_byte_size); 4715 lldb::offset_t symbol_stub_offset = symbol_stub_index * 4; 4716 if (indirect_symbol_index_data.ValidOffsetForDataOfSize( 4717 symbol_stub_offset, 4)) { 4718 const uint32_t stub_sym_id = 4719 indirect_symbol_index_data.GetU32(&symbol_stub_offset); 4720 if (stub_sym_id & (INDIRECT_SYMBOL_ABS | INDIRECT_SYMBOL_LOCAL)) 4721 continue; 4722 4723 NListIndexToSymbolIndexMap::const_iterator index_pos = 4724 m_nlist_idx_to_sym_idx.find(stub_sym_id); 4725 Symbol *stub_symbol = NULL; 4726 if (index_pos != end_index_pos) { 4727 // We have a remapping from the original nlist index to a 4728 // current symbol index, so just look this up by index 4729 stub_symbol = symtab->SymbolAtIndex(index_pos->second); 4730 } else { 4731 // We need to lookup a symbol using the original nlist symbol 4732 // index since this index is coming from the S_SYMBOL_STUBS 4733 stub_symbol = symtab->FindSymbolByID(stub_sym_id); 4734 } 4735 4736 if (stub_symbol) { 4737 Address so_addr(symbol_stub_addr, section_list); 4738 4739 if (stub_symbol->GetType() == eSymbolTypeUndefined) { 4740 // Change the external symbol into a trampoline that makes 4741 // sense These symbols were N_UNDF N_EXT, and are useless 4742 // to us, so we can re-use them so we don't have to make up 4743 // a synthetic symbol for no good reason. 4744 if (resolver_addresses.find(symbol_stub_addr) == 4745 resolver_addresses.end()) 4746 stub_symbol->SetType(eSymbolTypeTrampoline); 4747 else 4748 stub_symbol->SetType(eSymbolTypeResolver); 4749 stub_symbol->SetExternal(false); 4750 stub_symbol->GetAddressRef() = so_addr; 4751 stub_symbol->SetByteSize(symbol_stub_byte_size); 4752 } else { 4753 // Make a synthetic symbol to describe the trampoline stub 4754 Mangled stub_symbol_mangled_name(stub_symbol->GetMangled()); 4755 if (sym_idx >= num_syms) { 4756 sym = symtab->Resize(++num_syms); 4757 stub_symbol = NULL; // this pointer no longer valid 4758 } 4759 sym[sym_idx].SetID(synthetic_sym_id++); 4760 sym[sym_idx].GetMangled() = stub_symbol_mangled_name; 4761 if (resolver_addresses.find(symbol_stub_addr) == 4762 resolver_addresses.end()) 4763 sym[sym_idx].SetType(eSymbolTypeTrampoline); 4764 else 4765 sym[sym_idx].SetType(eSymbolTypeResolver); 4766 sym[sym_idx].SetIsSynthetic(true); 4767 sym[sym_idx].GetAddressRef() = so_addr; 4768 sym[sym_idx].SetByteSize(symbol_stub_byte_size); 4769 ++sym_idx; 4770 } 4771 } else { 4772 if (log) 4773 log->Warning("symbol stub referencing symbol table symbol " 4774 "%u that isn't in our minimal symbol table, " 4775 "fix this!!!", 4776 stub_sym_id); 4777 } 4778 } 4779 } 4780 } 4781 } 4782 } 4783 } 4784 4785 if (!trie_entries.empty()) { 4786 for (const auto &e : trie_entries) { 4787 if (e.entry.import_name) { 4788 // Only add indirect symbols from the Trie entries if we didn't have 4789 // a N_INDR nlist entry for this already 4790 if (indirect_symbol_names.find(e.entry.name) == 4791 indirect_symbol_names.end()) { 4792 // Make a synthetic symbol to describe re-exported symbol. 4793 if (sym_idx >= num_syms) 4794 sym = symtab->Resize(++num_syms); 4795 sym[sym_idx].SetID(synthetic_sym_id++); 4796 sym[sym_idx].GetMangled() = Mangled(e.entry.name); 4797 sym[sym_idx].SetType(eSymbolTypeReExported); 4798 sym[sym_idx].SetIsSynthetic(true); 4799 sym[sym_idx].SetReExportedSymbolName(e.entry.import_name); 4800 if (e.entry.other > 0 && e.entry.other <= dylib_files.GetSize()) { 4801 sym[sym_idx].SetReExportedSymbolSharedLibrary( 4802 dylib_files.GetFileSpecAtIndex(e.entry.other - 1)); 4803 } 4804 ++sym_idx; 4805 } 4806 } 4807 } 4808 } 4809 4810 // StreamFile s(stdout, false); 4811 // s.Printf ("Symbol table before CalculateSymbolSizes():\n"); 4812 // symtab->Dump(&s, NULL, eSortOrderNone); 4813 // Set symbol byte sizes correctly since mach-o nlist entries don't have 4814 // sizes 4815 symtab->CalculateSymbolSizes(); 4816 4817 // s.Printf ("Symbol table after CalculateSymbolSizes():\n"); 4818 // symtab->Dump(&s, NULL, eSortOrderNone); 4819 4820 return symtab->GetNumSymbols(); 4821 } 4822 return 0; 4823 } 4824 4825 void ObjectFileMachO::Dump(Stream *s) { 4826 ModuleSP module_sp(GetModule()); 4827 if (module_sp) { 4828 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 4829 s->Printf("%p: ", static_cast<void *>(this)); 4830 s->Indent(); 4831 if (m_header.magic == MH_MAGIC_64 || m_header.magic == MH_CIGAM_64) 4832 s->PutCString("ObjectFileMachO64"); 4833 else 4834 s->PutCString("ObjectFileMachO32"); 4835 4836 ArchSpec header_arch; 4837 GetArchitecture(header_arch); 4838 4839 *s << ", file = '" << m_file 4840 << "', triple = " << header_arch.GetTriple().getTriple() << "\n"; 4841 4842 SectionList *sections = GetSectionList(); 4843 if (sections) 4844 sections->Dump(s, NULL, true, UINT32_MAX); 4845 4846 if (m_symtab_ap.get()) 4847 m_symtab_ap->Dump(s, NULL, eSortOrderNone); 4848 } 4849 } 4850 4851 bool ObjectFileMachO::GetUUID(const llvm::MachO::mach_header &header, 4852 const lldb_private::DataExtractor &data, 4853 lldb::offset_t lc_offset, 4854 lldb_private::UUID &uuid) { 4855 uint32_t i; 4856 struct uuid_command load_cmd; 4857 4858 lldb::offset_t offset = lc_offset; 4859 for (i = 0; i < header.ncmds; ++i) { 4860 const lldb::offset_t cmd_offset = offset; 4861 if (data.GetU32(&offset, &load_cmd, 2) == NULL) 4862 break; 4863 4864 if (load_cmd.cmd == LC_UUID) { 4865 const uint8_t *uuid_bytes = data.PeekData(offset, 16); 4866 4867 if (uuid_bytes) { 4868 // OpenCL on Mac OS X uses the same UUID for each of its object files. 4869 // We pretend these object files have no UUID to prevent crashing. 4870 4871 const uint8_t opencl_uuid[] = {0x8c, 0x8e, 0xb3, 0x9b, 0x3b, 0xa8, 4872 0x4b, 0x16, 0xb6, 0xa4, 0x27, 0x63, 4873 0xbb, 0x14, 0xf0, 0x0d}; 4874 4875 if (!memcmp(uuid_bytes, opencl_uuid, 16)) 4876 return false; 4877 4878 uuid = UUID::fromOptionalData(uuid_bytes, 16); 4879 return true; 4880 } 4881 return false; 4882 } 4883 offset = cmd_offset + load_cmd.cmdsize; 4884 } 4885 return false; 4886 } 4887 4888 static llvm::StringRef GetOSName(uint32_t cmd) { 4889 switch (cmd) { 4890 case llvm::MachO::LC_VERSION_MIN_IPHONEOS: 4891 return llvm::Triple::getOSTypeName(llvm::Triple::IOS); 4892 case llvm::MachO::LC_VERSION_MIN_MACOSX: 4893 return llvm::Triple::getOSTypeName(llvm::Triple::MacOSX); 4894 case llvm::MachO::LC_VERSION_MIN_TVOS: 4895 return llvm::Triple::getOSTypeName(llvm::Triple::TvOS); 4896 case llvm::MachO::LC_VERSION_MIN_WATCHOS: 4897 return llvm::Triple::getOSTypeName(llvm::Triple::WatchOS); 4898 default: 4899 llvm_unreachable("unexpected LC_VERSION load command"); 4900 } 4901 } 4902 4903 namespace { 4904 struct OSEnv { 4905 llvm::StringRef os_type; 4906 llvm::StringRef environment; 4907 OSEnv(uint32_t cmd) { 4908 switch (cmd) { 4909 case PLATFORM_MACOS: 4910 os_type = llvm::Triple::getOSTypeName(llvm::Triple::MacOSX); 4911 return; 4912 case PLATFORM_IOS: 4913 os_type = llvm::Triple::getOSTypeName(llvm::Triple::IOS); 4914 return; 4915 case PLATFORM_TVOS: 4916 os_type = llvm::Triple::getOSTypeName(llvm::Triple::TvOS); 4917 return; 4918 case PLATFORM_WATCHOS: 4919 os_type = llvm::Triple::getOSTypeName(llvm::Triple::WatchOS); 4920 return; 4921 // NEED_BRIDGEOS_TRIPLE case PLATFORM_BRIDGEOS: 4922 // NEED_BRIDGEOS_TRIPLE os_type = llvm::Triple::getOSTypeName(llvm::Triple::BridgeOS); 4923 // NEED_BRIDGEOS_TRIPLE return; 4924 #if defined (PLATFORM_IOSSIMULATOR) && defined (PLATFORM_TVOSSIMULATOR) && defined (PLATFORM_WATCHOSSIMULATOR) 4925 case PLATFORM_IOSSIMULATOR: 4926 os_type = llvm::Triple::getOSTypeName(llvm::Triple::IOS); 4927 environment = 4928 llvm::Triple::getEnvironmentTypeName(llvm::Triple::Simulator); 4929 return; 4930 case PLATFORM_TVOSSIMULATOR: 4931 os_type = llvm::Triple::getOSTypeName(llvm::Triple::TvOS); 4932 environment = 4933 llvm::Triple::getEnvironmentTypeName(llvm::Triple::Simulator); 4934 return; 4935 case PLATFORM_WATCHOSSIMULATOR: 4936 os_type = llvm::Triple::getOSTypeName(llvm::Triple::WatchOS); 4937 environment = 4938 llvm::Triple::getEnvironmentTypeName(llvm::Triple::Simulator); 4939 return; 4940 #endif 4941 default: { 4942 Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS | 4943 LIBLLDB_LOG_PROCESS)); 4944 if (log) 4945 log->Printf("unsupported platform in LC_BUILD_VERSION"); 4946 } 4947 } 4948 } 4949 }; 4950 4951 struct MinOS { 4952 uint32_t major_version, minor_version, patch_version; 4953 MinOS(uint32_t version) 4954 : major_version(version >> 16), 4955 minor_version((version >> 8) & 0xffu), 4956 patch_version(version & 0xffu) {} 4957 }; 4958 } // namespace 4959 4960 bool ObjectFileMachO::GetArchitecture(const llvm::MachO::mach_header &header, 4961 const lldb_private::DataExtractor &data, 4962 lldb::offset_t lc_offset, 4963 ArchSpec &arch) { 4964 arch.SetArchitecture(eArchTypeMachO, header.cputype, header.cpusubtype); 4965 4966 if (arch.IsValid()) { 4967 llvm::Triple &triple = arch.GetTriple(); 4968 4969 // Set OS to an unspecified unknown or a "*" so it can match any OS 4970 triple.setOS(llvm::Triple::UnknownOS); 4971 triple.setOSName(llvm::StringRef()); 4972 4973 if (header.filetype == MH_PRELOAD) { 4974 if (header.cputype == CPU_TYPE_ARM) { 4975 // If this is a 32-bit arm binary, and it's a standalone binary, force 4976 // the Vendor to Apple so we don't accidentally pick up the generic 4977 // armv7 ABI at runtime. Apple's armv7 ABI always uses r7 for the 4978 // frame pointer register; most other armv7 ABIs use a combination of 4979 // r7 and r11. 4980 triple.setVendor(llvm::Triple::Apple); 4981 } else { 4982 // Set vendor to an unspecified unknown or a "*" so it can match any 4983 // vendor This is required for correct behavior of EFI debugging on 4984 // x86_64 4985 triple.setVendor(llvm::Triple::UnknownVendor); 4986 triple.setVendorName(llvm::StringRef()); 4987 } 4988 return true; 4989 } else { 4990 struct load_command load_cmd; 4991 llvm::SmallString<16> os_name; 4992 llvm::raw_svector_ostream os(os_name); 4993 4994 // See if there is an LC_VERSION_MIN_* load command that can give 4995 // us the OS type. 4996 lldb::offset_t offset = lc_offset; 4997 for (uint32_t i = 0; i < header.ncmds; ++i) { 4998 const lldb::offset_t cmd_offset = offset; 4999 if (data.GetU32(&offset, &load_cmd, 2) == NULL) 5000 break; 5001 5002 struct version_min_command version_min; 5003 switch (load_cmd.cmd) { 5004 case llvm::MachO::LC_VERSION_MIN_IPHONEOS: 5005 case llvm::MachO::LC_VERSION_MIN_MACOSX: 5006 case llvm::MachO::LC_VERSION_MIN_TVOS: 5007 case llvm::MachO::LC_VERSION_MIN_WATCHOS: { 5008 if (load_cmd.cmdsize != sizeof(version_min)) 5009 break; 5010 if (data.ExtractBytes(cmd_offset, sizeof(version_min), 5011 data.GetByteOrder(), &version_min) == 0) 5012 break; 5013 MinOS min_os(version_min.version); 5014 os << GetOSName(load_cmd.cmd) << min_os.major_version << '.' 5015 << min_os.minor_version << '.' << min_os.patch_version; 5016 triple.setOSName(os.str()); 5017 return true; 5018 } 5019 default: 5020 break; 5021 } 5022 5023 offset = cmd_offset + load_cmd.cmdsize; 5024 } 5025 5026 // See if there is an LC_BUILD_VERSION load command that can give 5027 // us the OS type. 5028 5029 offset = lc_offset; 5030 for (uint32_t i = 0; i < header.ncmds; ++i) { 5031 const lldb::offset_t cmd_offset = offset; 5032 if (data.GetU32(&offset, &load_cmd, 2) == NULL) 5033 break; 5034 do { 5035 if (load_cmd.cmd == llvm::MachO::LC_BUILD_VERSION) { 5036 struct build_version_command build_version; 5037 if (load_cmd.cmdsize < sizeof(build_version)) { 5038 // Malformed load command. 5039 break; 5040 } 5041 if (data.ExtractBytes(cmd_offset, sizeof(build_version), 5042 data.GetByteOrder(), &build_version) == 0) 5043 break; 5044 MinOS min_os(build_version.minos); 5045 OSEnv os_env(build_version.platform); 5046 if (os_env.os_type.empty()) 5047 break; 5048 os << os_env.os_type << min_os.major_version << '.' 5049 << min_os.minor_version << '.' << min_os.patch_version; 5050 triple.setOSName(os.str()); 5051 if (!os_env.environment.empty()) 5052 triple.setEnvironmentName(os_env.environment); 5053 return true; 5054 } 5055 } while (0); 5056 offset = cmd_offset + load_cmd.cmdsize; 5057 } 5058 5059 if (header.filetype != MH_KEXT_BUNDLE) { 5060 // We didn't find a LC_VERSION_MIN load command and this isn't a KEXT 5061 // so lets not say our Vendor is Apple, leave it as an unspecified 5062 // unknown 5063 triple.setVendor(llvm::Triple::UnknownVendor); 5064 triple.setVendorName(llvm::StringRef()); 5065 } 5066 } 5067 } 5068 return arch.IsValid(); 5069 } 5070 5071 bool ObjectFileMachO::GetUUID(lldb_private::UUID *uuid) { 5072 ModuleSP module_sp(GetModule()); 5073 if (module_sp) { 5074 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5075 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5076 return GetUUID(m_header, m_data, offset, *uuid); 5077 } 5078 return false; 5079 } 5080 5081 uint32_t ObjectFileMachO::GetDependentModules(FileSpecList &files) { 5082 uint32_t count = 0; 5083 ModuleSP module_sp(GetModule()); 5084 if (module_sp) { 5085 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5086 struct load_command load_cmd; 5087 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5088 std::vector<std::string> rpath_paths; 5089 std::vector<std::string> rpath_relative_paths; 5090 std::vector<std::string> at_exec_relative_paths; 5091 uint32_t i; 5092 for (i = 0; i < m_header.ncmds; ++i) { 5093 const uint32_t cmd_offset = offset; 5094 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 5095 break; 5096 5097 switch (load_cmd.cmd) { 5098 case LC_RPATH: 5099 case LC_LOAD_DYLIB: 5100 case LC_LOAD_WEAK_DYLIB: 5101 case LC_REEXPORT_DYLIB: 5102 case LC_LOAD_DYLINKER: 5103 case LC_LOADFVMLIB: 5104 case LC_LOAD_UPWARD_DYLIB: { 5105 uint32_t name_offset = cmd_offset + m_data.GetU32(&offset); 5106 const char *path = m_data.PeekCStr(name_offset); 5107 if (path) { 5108 if (load_cmd.cmd == LC_RPATH) 5109 rpath_paths.push_back(path); 5110 else { 5111 if (path[0] == '@') { 5112 if (strncmp(path, "@rpath", strlen("@rpath")) == 0) 5113 rpath_relative_paths.push_back(path + strlen("@rpath")); 5114 else if (strncmp(path, "@executable_path", 5115 strlen("@executable_path")) == 0) 5116 at_exec_relative_paths.push_back(path 5117 + strlen("@executable_path")); 5118 } else { 5119 FileSpec file_spec(path); 5120 if (files.AppendIfUnique(file_spec)) 5121 count++; 5122 } 5123 } 5124 } 5125 } break; 5126 5127 default: 5128 break; 5129 } 5130 offset = cmd_offset + load_cmd.cmdsize; 5131 } 5132 5133 FileSpec this_file_spec(m_file); 5134 FileSystem::Instance().Resolve(this_file_spec); 5135 5136 if (!rpath_paths.empty()) { 5137 // Fixup all LC_RPATH values to be absolute paths 5138 std::string loader_path("@loader_path"); 5139 std::string executable_path("@executable_path"); 5140 for (auto &rpath : rpath_paths) { 5141 if (rpath.find(loader_path) == 0) { 5142 rpath.erase(0, loader_path.size()); 5143 rpath.insert(0, this_file_spec.GetDirectory().GetCString()); 5144 } else if (rpath.find(executable_path) == 0) { 5145 rpath.erase(0, executable_path.size()); 5146 rpath.insert(0, this_file_spec.GetDirectory().GetCString()); 5147 } 5148 } 5149 5150 for (const auto &rpath_relative_path : rpath_relative_paths) { 5151 for (const auto &rpath : rpath_paths) { 5152 std::string path = rpath; 5153 path += rpath_relative_path; 5154 // It is OK to resolve this path because we must find a file on disk 5155 // for us to accept it anyway if it is rpath relative. 5156 FileSpec file_spec(path); 5157 FileSystem::Instance().Resolve(file_spec); 5158 if (FileSystem::Instance().Exists(file_spec) && 5159 files.AppendIfUnique(file_spec)) { 5160 count++; 5161 break; 5162 } 5163 } 5164 } 5165 } 5166 5167 // We may have @executable_paths but no RPATHS. Figure those out here. 5168 // Only do this if this object file is the executable. We have no way to 5169 // get back to the actual executable otherwise, so we won't get the right 5170 // path. 5171 if (!at_exec_relative_paths.empty() && CalculateType() == eTypeExecutable) { 5172 FileSpec exec_dir = this_file_spec.CopyByRemovingLastPathComponent(); 5173 for (const auto &at_exec_relative_path : at_exec_relative_paths) { 5174 FileSpec file_spec = 5175 exec_dir.CopyByAppendingPathComponent(at_exec_relative_path); 5176 if (FileSystem::Instance().Exists(file_spec) && 5177 files.AppendIfUnique(file_spec)) 5178 count++; 5179 } 5180 } 5181 } 5182 return count; 5183 } 5184 5185 lldb_private::Address ObjectFileMachO::GetEntryPointAddress() { 5186 // If the object file is not an executable it can't hold the entry point. 5187 // m_entry_point_address is initialized to an invalid address, so we can just 5188 // return that. If m_entry_point_address is valid it means we've found it 5189 // already, so return the cached value. 5190 5191 if (!IsExecutable() || m_entry_point_address.IsValid()) 5192 return m_entry_point_address; 5193 5194 // Otherwise, look for the UnixThread or Thread command. The data for the 5195 // Thread command is given in /usr/include/mach-o.h, but it is basically: 5196 // 5197 // uint32_t flavor - this is the flavor argument you would pass to 5198 // thread_get_state 5199 // uint32_t count - this is the count of longs in the thread state data 5200 // struct XXX_thread_state state - this is the structure from 5201 // <machine/thread_status.h> corresponding to the flavor. 5202 // <repeat this trio> 5203 // 5204 // So we just keep reading the various register flavors till we find the GPR 5205 // one, then read the PC out of there. 5206 // FIXME: We will need to have a "RegisterContext data provider" class at some 5207 // point that can get all the registers 5208 // out of data in this form & attach them to a given thread. That should 5209 // underlie the MacOS X User process plugin, and we'll also need it for the 5210 // MacOS X Core File process plugin. When we have that we can also use it 5211 // here. 5212 // 5213 // For now we hard-code the offsets and flavors we need: 5214 // 5215 // 5216 5217 ModuleSP module_sp(GetModule()); 5218 if (module_sp) { 5219 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5220 struct load_command load_cmd; 5221 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5222 uint32_t i; 5223 lldb::addr_t start_address = LLDB_INVALID_ADDRESS; 5224 bool done = false; 5225 5226 for (i = 0; i < m_header.ncmds; ++i) { 5227 const lldb::offset_t cmd_offset = offset; 5228 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 5229 break; 5230 5231 switch (load_cmd.cmd) { 5232 case LC_UNIXTHREAD: 5233 case LC_THREAD: { 5234 while (offset < cmd_offset + load_cmd.cmdsize) { 5235 uint32_t flavor = m_data.GetU32(&offset); 5236 uint32_t count = m_data.GetU32(&offset); 5237 if (count == 0) { 5238 // We've gotten off somehow, log and exit; 5239 return m_entry_point_address; 5240 } 5241 5242 switch (m_header.cputype) { 5243 case llvm::MachO::CPU_TYPE_ARM: 5244 if (flavor == 1 || 5245 flavor == 9) // ARM_THREAD_STATE/ARM_THREAD_STATE32 from 5246 // mach/arm/thread_status.h 5247 { 5248 offset += 60; // This is the offset of pc in the GPR thread state 5249 // data structure. 5250 start_address = m_data.GetU32(&offset); 5251 done = true; 5252 } 5253 break; 5254 case llvm::MachO::CPU_TYPE_ARM64: 5255 if (flavor == 6) // ARM_THREAD_STATE64 from mach/arm/thread_status.h 5256 { 5257 offset += 256; // This is the offset of pc in the GPR thread state 5258 // data structure. 5259 start_address = m_data.GetU64(&offset); 5260 done = true; 5261 } 5262 break; 5263 case llvm::MachO::CPU_TYPE_I386: 5264 if (flavor == 5265 1) // x86_THREAD_STATE32 from mach/i386/thread_status.h 5266 { 5267 offset += 40; // This is the offset of eip in the GPR thread state 5268 // data structure. 5269 start_address = m_data.GetU32(&offset); 5270 done = true; 5271 } 5272 break; 5273 case llvm::MachO::CPU_TYPE_X86_64: 5274 if (flavor == 5275 4) // x86_THREAD_STATE64 from mach/i386/thread_status.h 5276 { 5277 offset += 16 * 8; // This is the offset of rip in the GPR thread 5278 // state data structure. 5279 start_address = m_data.GetU64(&offset); 5280 done = true; 5281 } 5282 break; 5283 default: 5284 return m_entry_point_address; 5285 } 5286 // Haven't found the GPR flavor yet, skip over the data for this 5287 // flavor: 5288 if (done) 5289 break; 5290 offset += count * 4; 5291 } 5292 } break; 5293 case LC_MAIN: { 5294 ConstString text_segment_name("__TEXT"); 5295 uint64_t entryoffset = m_data.GetU64(&offset); 5296 SectionSP text_segment_sp = 5297 GetSectionList()->FindSectionByName(text_segment_name); 5298 if (text_segment_sp) { 5299 done = true; 5300 start_address = text_segment_sp->GetFileAddress() + entryoffset; 5301 } 5302 } break; 5303 5304 default: 5305 break; 5306 } 5307 if (done) 5308 break; 5309 5310 // Go to the next load command: 5311 offset = cmd_offset + load_cmd.cmdsize; 5312 } 5313 5314 if (start_address != LLDB_INVALID_ADDRESS) { 5315 // We got the start address from the load commands, so now resolve that 5316 // address in the sections of this ObjectFile: 5317 if (!m_entry_point_address.ResolveAddressUsingFileSections( 5318 start_address, GetSectionList())) { 5319 m_entry_point_address.Clear(); 5320 } 5321 } else { 5322 // We couldn't read the UnixThread load command - maybe it wasn't there. 5323 // As a fallback look for the "start" symbol in the main executable. 5324 5325 ModuleSP module_sp(GetModule()); 5326 5327 if (module_sp) { 5328 SymbolContextList contexts; 5329 SymbolContext context; 5330 if (module_sp->FindSymbolsWithNameAndType(ConstString("start"), 5331 eSymbolTypeCode, contexts)) { 5332 if (contexts.GetContextAtIndex(0, context)) 5333 m_entry_point_address = context.symbol->GetAddress(); 5334 } 5335 } 5336 } 5337 } 5338 5339 return m_entry_point_address; 5340 } 5341 5342 lldb_private::Address ObjectFileMachO::GetBaseAddress() { 5343 lldb_private::Address header_addr; 5344 SectionList *section_list = GetSectionList(); 5345 if (section_list) { 5346 SectionSP text_segment_sp( 5347 section_list->FindSectionByName(GetSegmentNameTEXT())); 5348 if (text_segment_sp) { 5349 header_addr.SetSection(text_segment_sp); 5350 header_addr.SetOffset(0); 5351 } 5352 } 5353 return header_addr; 5354 } 5355 5356 uint32_t ObjectFileMachO::GetNumThreadContexts() { 5357 ModuleSP module_sp(GetModule()); 5358 if (module_sp) { 5359 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5360 if (!m_thread_context_offsets_valid) { 5361 m_thread_context_offsets_valid = true; 5362 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5363 FileRangeArray::Entry file_range; 5364 thread_command thread_cmd; 5365 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 5366 const uint32_t cmd_offset = offset; 5367 if (m_data.GetU32(&offset, &thread_cmd, 2) == NULL) 5368 break; 5369 5370 if (thread_cmd.cmd == LC_THREAD) { 5371 file_range.SetRangeBase(offset); 5372 file_range.SetByteSize(thread_cmd.cmdsize - 8); 5373 m_thread_context_offsets.Append(file_range); 5374 } 5375 offset = cmd_offset + thread_cmd.cmdsize; 5376 } 5377 } 5378 } 5379 return m_thread_context_offsets.GetSize(); 5380 } 5381 5382 std::string ObjectFileMachO::GetIdentifierString() { 5383 std::string result; 5384 ModuleSP module_sp(GetModule()); 5385 if (module_sp) { 5386 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5387 5388 // First, look over the load commands for an LC_NOTE load command with 5389 // data_owner string "kern ver str" & use that if found. 5390 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5391 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 5392 const uint32_t cmd_offset = offset; 5393 load_command lc; 5394 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 5395 break; 5396 if (lc.cmd == LC_NOTE) 5397 { 5398 char data_owner[17]; 5399 m_data.CopyData (offset, 16, data_owner); 5400 data_owner[16] = '\0'; 5401 offset += 16; 5402 uint64_t fileoff = m_data.GetU64_unchecked (&offset); 5403 uint64_t size = m_data.GetU64_unchecked (&offset); 5404 5405 // "kern ver str" has a uint32_t version and then a nul terminated 5406 // c-string. 5407 if (strcmp ("kern ver str", data_owner) == 0) 5408 { 5409 offset = fileoff; 5410 uint32_t version; 5411 if (m_data.GetU32 (&offset, &version, 1) != nullptr) 5412 { 5413 if (version == 1) 5414 { 5415 uint32_t strsize = size - sizeof (uint32_t); 5416 char *buf = (char*) malloc (strsize); 5417 if (buf) 5418 { 5419 m_data.CopyData (offset, strsize, buf); 5420 buf[strsize - 1] = '\0'; 5421 result = buf; 5422 if (buf) 5423 free (buf); 5424 return result; 5425 } 5426 } 5427 } 5428 } 5429 } 5430 offset = cmd_offset + lc.cmdsize; 5431 } 5432 5433 // Second, make a pass over the load commands looking for an obsolete 5434 // LC_IDENT load command. 5435 offset = MachHeaderSizeFromMagic(m_header.magic); 5436 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 5437 const uint32_t cmd_offset = offset; 5438 struct ident_command ident_command; 5439 if (m_data.GetU32(&offset, &ident_command, 2) == NULL) 5440 break; 5441 if (ident_command.cmd == LC_IDENT && ident_command.cmdsize != 0) { 5442 char *buf = (char *) malloc (ident_command.cmdsize); 5443 if (buf != nullptr 5444 && m_data.CopyData (offset, ident_command.cmdsize, buf) == ident_command.cmdsize) { 5445 buf[ident_command.cmdsize - 1] = '\0'; 5446 result = buf; 5447 } 5448 if (buf) 5449 free (buf); 5450 } 5451 offset = cmd_offset + ident_command.cmdsize; 5452 } 5453 5454 } 5455 return result; 5456 } 5457 5458 bool ObjectFileMachO::GetCorefileMainBinaryInfo (addr_t &address, UUID &uuid) { 5459 address = LLDB_INVALID_ADDRESS; 5460 uuid.Clear(); 5461 ModuleSP module_sp(GetModule()); 5462 if (module_sp) { 5463 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5464 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5465 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 5466 const uint32_t cmd_offset = offset; 5467 load_command lc; 5468 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 5469 break; 5470 if (lc.cmd == LC_NOTE) 5471 { 5472 char data_owner[17]; 5473 memset (data_owner, 0, sizeof (data_owner)); 5474 m_data.CopyData (offset, 16, data_owner); 5475 offset += 16; 5476 uint64_t fileoff = m_data.GetU64_unchecked (&offset); 5477 uint64_t size = m_data.GetU64_unchecked (&offset); 5478 5479 // "main bin spec" (main binary specification) data payload is 5480 // formatted: 5481 // uint32_t version [currently 1] 5482 // uint32_t type [0 == unspecified, 1 == kernel, 2 == user process] 5483 // uint64_t address [ UINT64_MAX if address not specified ] 5484 // uuid_t uuid [ all zero's if uuid not specified ] 5485 // uint32_t log2_pagesize [ process page size in log base 2, e.g. 4k pages are 12. 0 for unspecified ] 5486 5487 if (strcmp ("main bin spec", data_owner) == 0 && size >= 32) 5488 { 5489 offset = fileoff; 5490 uint32_t version; 5491 if (m_data.GetU32 (&offset, &version, 1) != nullptr && version == 1) 5492 { 5493 uint32_t type = 0; 5494 uuid_t raw_uuid; 5495 memset (raw_uuid, 0, sizeof (uuid_t)); 5496 5497 if (m_data.GetU32(&offset, &type, 1) && 5498 m_data.GetU64(&offset, &address, 1) && 5499 m_data.CopyData(offset, sizeof(uuid_t), raw_uuid) != 0) { 5500 uuid = UUID::fromOptionalData(raw_uuid, sizeof(uuid_t)); 5501 return true; 5502 } 5503 } 5504 } 5505 } 5506 offset = cmd_offset + lc.cmdsize; 5507 } 5508 } 5509 return false; 5510 } 5511 5512 lldb::RegisterContextSP 5513 ObjectFileMachO::GetThreadContextAtIndex(uint32_t idx, 5514 lldb_private::Thread &thread) { 5515 lldb::RegisterContextSP reg_ctx_sp; 5516 5517 ModuleSP module_sp(GetModule()); 5518 if (module_sp) { 5519 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5520 if (!m_thread_context_offsets_valid) 5521 GetNumThreadContexts(); 5522 5523 const FileRangeArray::Entry *thread_context_file_range = 5524 m_thread_context_offsets.GetEntryAtIndex(idx); 5525 if (thread_context_file_range) { 5526 5527 DataExtractor data(m_data, thread_context_file_range->GetRangeBase(), 5528 thread_context_file_range->GetByteSize()); 5529 5530 switch (m_header.cputype) { 5531 case llvm::MachO::CPU_TYPE_ARM64: 5532 reg_ctx_sp.reset(new RegisterContextDarwin_arm64_Mach(thread, data)); 5533 break; 5534 5535 case llvm::MachO::CPU_TYPE_ARM: 5536 reg_ctx_sp.reset(new RegisterContextDarwin_arm_Mach(thread, data)); 5537 break; 5538 5539 case llvm::MachO::CPU_TYPE_I386: 5540 reg_ctx_sp.reset(new RegisterContextDarwin_i386_Mach(thread, data)); 5541 break; 5542 5543 case llvm::MachO::CPU_TYPE_X86_64: 5544 reg_ctx_sp.reset(new RegisterContextDarwin_x86_64_Mach(thread, data)); 5545 break; 5546 } 5547 } 5548 } 5549 return reg_ctx_sp; 5550 } 5551 5552 ObjectFile::Type ObjectFileMachO::CalculateType() { 5553 switch (m_header.filetype) { 5554 case MH_OBJECT: // 0x1u 5555 if (GetAddressByteSize() == 4) { 5556 // 32 bit kexts are just object files, but they do have a valid 5557 // UUID load command. 5558 UUID uuid; 5559 if (GetUUID(&uuid)) { 5560 // this checking for the UUID load command is not enough we could 5561 // eventually look for the symbol named "OSKextGetCurrentIdentifier" as 5562 // this is required of kexts 5563 if (m_strata == eStrataInvalid) 5564 m_strata = eStrataKernel; 5565 return eTypeSharedLibrary; 5566 } 5567 } 5568 return eTypeObjectFile; 5569 5570 case MH_EXECUTE: 5571 return eTypeExecutable; // 0x2u 5572 case MH_FVMLIB: 5573 return eTypeSharedLibrary; // 0x3u 5574 case MH_CORE: 5575 return eTypeCoreFile; // 0x4u 5576 case MH_PRELOAD: 5577 return eTypeSharedLibrary; // 0x5u 5578 case MH_DYLIB: 5579 return eTypeSharedLibrary; // 0x6u 5580 case MH_DYLINKER: 5581 return eTypeDynamicLinker; // 0x7u 5582 case MH_BUNDLE: 5583 return eTypeSharedLibrary; // 0x8u 5584 case MH_DYLIB_STUB: 5585 return eTypeStubLibrary; // 0x9u 5586 case MH_DSYM: 5587 return eTypeDebugInfo; // 0xAu 5588 case MH_KEXT_BUNDLE: 5589 return eTypeSharedLibrary; // 0xBu 5590 default: 5591 break; 5592 } 5593 return eTypeUnknown; 5594 } 5595 5596 ObjectFile::Strata ObjectFileMachO::CalculateStrata() { 5597 switch (m_header.filetype) { 5598 case MH_OBJECT: // 0x1u 5599 { 5600 // 32 bit kexts are just object files, but they do have a valid 5601 // UUID load command. 5602 UUID uuid; 5603 if (GetUUID(&uuid)) { 5604 // this checking for the UUID load command is not enough we could 5605 // eventually look for the symbol named "OSKextGetCurrentIdentifier" as 5606 // this is required of kexts 5607 if (m_type == eTypeInvalid) 5608 m_type = eTypeSharedLibrary; 5609 5610 return eStrataKernel; 5611 } 5612 } 5613 return eStrataUnknown; 5614 5615 case MH_EXECUTE: // 0x2u 5616 // Check for the MH_DYLDLINK bit in the flags 5617 if (m_header.flags & MH_DYLDLINK) { 5618 return eStrataUser; 5619 } else { 5620 SectionList *section_list = GetSectionList(); 5621 if (section_list) { 5622 static ConstString g_kld_section_name("__KLD"); 5623 if (section_list->FindSectionByName(g_kld_section_name)) 5624 return eStrataKernel; 5625 } 5626 } 5627 return eStrataRawImage; 5628 5629 case MH_FVMLIB: 5630 return eStrataUser; // 0x3u 5631 case MH_CORE: 5632 return eStrataUnknown; // 0x4u 5633 case MH_PRELOAD: 5634 return eStrataRawImage; // 0x5u 5635 case MH_DYLIB: 5636 return eStrataUser; // 0x6u 5637 case MH_DYLINKER: 5638 return eStrataUser; // 0x7u 5639 case MH_BUNDLE: 5640 return eStrataUser; // 0x8u 5641 case MH_DYLIB_STUB: 5642 return eStrataUser; // 0x9u 5643 case MH_DSYM: 5644 return eStrataUnknown; // 0xAu 5645 case MH_KEXT_BUNDLE: 5646 return eStrataKernel; // 0xBu 5647 default: 5648 break; 5649 } 5650 return eStrataUnknown; 5651 } 5652 5653 llvm::VersionTuple ObjectFileMachO::GetVersion() { 5654 ModuleSP module_sp(GetModule()); 5655 if (module_sp) { 5656 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5657 struct dylib_command load_cmd; 5658 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5659 uint32_t version_cmd = 0; 5660 uint64_t version = 0; 5661 uint32_t i; 5662 for (i = 0; i < m_header.ncmds; ++i) { 5663 const lldb::offset_t cmd_offset = offset; 5664 if (m_data.GetU32(&offset, &load_cmd, 2) == NULL) 5665 break; 5666 5667 if (load_cmd.cmd == LC_ID_DYLIB) { 5668 if (version_cmd == 0) { 5669 version_cmd = load_cmd.cmd; 5670 if (m_data.GetU32(&offset, &load_cmd.dylib, 4) == NULL) 5671 break; 5672 version = load_cmd.dylib.current_version; 5673 } 5674 break; // Break for now unless there is another more complete version 5675 // number load command in the future. 5676 } 5677 offset = cmd_offset + load_cmd.cmdsize; 5678 } 5679 5680 if (version_cmd == LC_ID_DYLIB) { 5681 unsigned major = (version & 0xFFFF0000ull) >> 16; 5682 unsigned minor = (version & 0x0000FF00ull) >> 8; 5683 unsigned subminor = (version & 0x000000FFull); 5684 return llvm::VersionTuple(major, minor, subminor); 5685 } 5686 } 5687 return llvm::VersionTuple(); 5688 } 5689 5690 bool ObjectFileMachO::GetArchitecture(ArchSpec &arch) { 5691 ModuleSP module_sp(GetModule()); 5692 if (module_sp) { 5693 std::lock_guard<std::recursive_mutex> guard(module_sp->GetMutex()); 5694 return GetArchitecture(m_header, m_data, 5695 MachHeaderSizeFromMagic(m_header.magic), arch); 5696 } 5697 return false; 5698 } 5699 5700 void ObjectFileMachO::GetProcessSharedCacheUUID(Process *process, addr_t &base_addr, UUID &uuid) { 5701 uuid.Clear(); 5702 base_addr = LLDB_INVALID_ADDRESS; 5703 if (process && process->GetDynamicLoader()) { 5704 DynamicLoader *dl = process->GetDynamicLoader(); 5705 LazyBool using_shared_cache; 5706 LazyBool private_shared_cache; 5707 dl->GetSharedCacheInformation(base_addr, uuid, using_shared_cache, 5708 private_shared_cache); 5709 } 5710 Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS | LIBLLDB_LOG_PROCESS)); 5711 if (log) 5712 log->Printf("inferior process shared cache has a UUID of %s, base address 0x%" PRIx64 , uuid.GetAsString().c_str(), base_addr); 5713 } 5714 5715 // From dyld SPI header dyld_process_info.h 5716 typedef void *dyld_process_info; 5717 struct lldb_copy__dyld_process_cache_info { 5718 uuid_t cacheUUID; // UUID of cache used by process 5719 uint64_t cacheBaseAddress; // load address of dyld shared cache 5720 bool noCache; // process is running without a dyld cache 5721 bool privateCache; // process is using a private copy of its dyld cache 5722 }; 5723 5724 // #including mach/mach.h pulls in machine.h & CPU_TYPE_ARM etc conflicts with llvm 5725 // enum definitions llvm::MachO::CPU_TYPE_ARM turning them into compile errors. 5726 // So we need to use the actual underlying types of task_t and kern_return_t 5727 // below. 5728 extern "C" unsigned int /*task_t*/ mach_task_self(); 5729 5730 void ObjectFileMachO::GetLLDBSharedCacheUUID(addr_t &base_addr, UUID &uuid) { 5731 uuid.Clear(); 5732 base_addr = LLDB_INVALID_ADDRESS; 5733 5734 #if defined(__APPLE__) && \ 5735 (defined(__arm__) || defined(__arm64__) || defined(__aarch64__)) 5736 uint8_t *(*dyld_get_all_image_infos)(void); 5737 dyld_get_all_image_infos = 5738 (uint8_t * (*)())dlsym(RTLD_DEFAULT, "_dyld_get_all_image_infos"); 5739 if (dyld_get_all_image_infos) { 5740 uint8_t *dyld_all_image_infos_address = dyld_get_all_image_infos(); 5741 if (dyld_all_image_infos_address) { 5742 uint32_t *version = (uint32_t *) 5743 dyld_all_image_infos_address; // version <mach-o/dyld_images.h> 5744 if (*version >= 13) { 5745 uuid_t *sharedCacheUUID_address = 0; 5746 int wordsize = sizeof(uint8_t *); 5747 if (wordsize == 8) { 5748 sharedCacheUUID_address = 5749 (uuid_t *)((uint8_t *)dyld_all_image_infos_address + 5750 160); // sharedCacheUUID <mach-o/dyld_images.h> 5751 if (*version >= 15) 5752 base_addr = *(uint64_t *) ((uint8_t *) dyld_all_image_infos_address 5753 + 176); // sharedCacheBaseAddress <mach-o/dyld_images.h> 5754 } else { 5755 sharedCacheUUID_address = 5756 (uuid_t *)((uint8_t *)dyld_all_image_infos_address + 5757 84); // sharedCacheUUID <mach-o/dyld_images.h> 5758 if (*version >= 15) { 5759 base_addr = 0; 5760 base_addr = *(uint32_t *) ((uint8_t *) dyld_all_image_infos_address 5761 + 100); // sharedCacheBaseAddress <mach-o/dyld_images.h> 5762 } 5763 } 5764 uuid = UUID::fromOptionalData(sharedCacheUUID_address, sizeof(uuid_t)); 5765 } 5766 } 5767 } else { 5768 // Exists in macOS 10.12 and later, iOS 10.0 and later - dyld SPI 5769 dyld_process_info (*dyld_process_info_create)(unsigned int /* task_t */ task, uint64_t timestamp, unsigned int /*kern_return_t*/ *kernelError); 5770 void (*dyld_process_info_get_cache)(void *info, void *cacheInfo); 5771 void (*dyld_process_info_release)(dyld_process_info info); 5772 5773 dyld_process_info_create = (void *(*)(unsigned int /* task_t */, uint64_t, unsigned int /*kern_return_t*/ *)) 5774 dlsym (RTLD_DEFAULT, "_dyld_process_info_create"); 5775 dyld_process_info_get_cache = (void (*)(void *, void *)) 5776 dlsym (RTLD_DEFAULT, "_dyld_process_info_get_cache"); 5777 dyld_process_info_release = (void (*)(void *)) 5778 dlsym (RTLD_DEFAULT, "_dyld_process_info_release"); 5779 5780 if (dyld_process_info_create && dyld_process_info_get_cache) { 5781 unsigned int /*kern_return_t */ kern_ret; 5782 dyld_process_info process_info = dyld_process_info_create(::mach_task_self(), 0, &kern_ret); 5783 if (process_info) { 5784 struct lldb_copy__dyld_process_cache_info sc_info; 5785 memset (&sc_info, 0, sizeof (struct lldb_copy__dyld_process_cache_info)); 5786 dyld_process_info_get_cache (process_info, &sc_info); 5787 if (sc_info.cacheBaseAddress != 0) { 5788 base_addr = sc_info.cacheBaseAddress; 5789 uuid = UUID::fromOptionalData(sc_info.cacheUUID, sizeof(uuid_t)); 5790 } 5791 dyld_process_info_release (process_info); 5792 } 5793 } 5794 } 5795 Log *log(lldb_private::GetLogIfAnyCategoriesSet(LIBLLDB_LOG_SYMBOLS | LIBLLDB_LOG_PROCESS)); 5796 if (log && uuid.IsValid()) 5797 log->Printf("lldb's in-memory shared cache has a UUID of %s base address of 0x%" PRIx64, uuid.GetAsString().c_str(), base_addr); 5798 #endif 5799 } 5800 5801 llvm::VersionTuple ObjectFileMachO::GetMinimumOSVersion() { 5802 if (!m_min_os_version) { 5803 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5804 for (uint32_t i = 0; i < m_header.ncmds; ++i) { 5805 const lldb::offset_t load_cmd_offset = offset; 5806 5807 version_min_command lc; 5808 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 5809 break; 5810 if (lc.cmd == llvm::MachO::LC_VERSION_MIN_MACOSX || 5811 lc.cmd == llvm::MachO::LC_VERSION_MIN_IPHONEOS || 5812 lc.cmd == llvm::MachO::LC_VERSION_MIN_TVOS || 5813 lc.cmd == llvm::MachO::LC_VERSION_MIN_WATCHOS) { 5814 if (m_data.GetU32(&offset, &lc.version, 5815 (sizeof(lc) / sizeof(uint32_t)) - 2)) { 5816 const uint32_t xxxx = lc.version >> 16; 5817 const uint32_t yy = (lc.version >> 8) & 0xffu; 5818 const uint32_t zz = lc.version & 0xffu; 5819 if (xxxx) { 5820 m_min_os_version = llvm::VersionTuple(xxxx, yy, zz); 5821 break; 5822 } 5823 } 5824 } else if (lc.cmd == llvm::MachO::LC_BUILD_VERSION) { 5825 // struct build_version_command { 5826 // uint32_t cmd; /* LC_BUILD_VERSION */ 5827 // uint32_t cmdsize; /* sizeof(struct build_version_command) plus */ 5828 // /* ntools * sizeof(struct build_tool_version) */ 5829 // uint32_t platform; /* platform */ 5830 // uint32_t minos; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */ 5831 // uint32_t sdk; /* X.Y.Z is encoded in nibbles xxxx.yy.zz */ 5832 // uint32_t ntools; /* number of tool entries following this */ 5833 // }; 5834 5835 offset += 4; // skip platform 5836 uint32_t minos = m_data.GetU32(&offset); 5837 5838 const uint32_t xxxx = minos >> 16; 5839 const uint32_t yy = (minos >> 8) & 0xffu; 5840 const uint32_t zz = minos & 0xffu; 5841 if (xxxx) { 5842 m_min_os_version = llvm::VersionTuple(xxxx, yy, zz); 5843 break; 5844 } 5845 } 5846 5847 offset = load_cmd_offset + lc.cmdsize; 5848 } 5849 5850 if (!m_min_os_version) { 5851 // Set version to an empty value so we don't keep trying to 5852 m_min_os_version = llvm::VersionTuple(); 5853 } 5854 } 5855 5856 return *m_min_os_version; 5857 } 5858 5859 uint32_t ObjectFileMachO::GetSDKVersion(uint32_t *versions, 5860 uint32_t num_versions) { 5861 if (m_sdk_versions.empty()) { 5862 lldb::offset_t offset = MachHeaderSizeFromMagic(m_header.magic); 5863 bool success = false; 5864 for (uint32_t i = 0; !success && i < m_header.ncmds; ++i) { 5865 const lldb::offset_t load_cmd_offset = offset; 5866 5867 version_min_command lc; 5868 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 5869 break; 5870 if (lc.cmd == llvm::MachO::LC_VERSION_MIN_MACOSX || 5871 lc.cmd == llvm::MachO::LC_VERSION_MIN_IPHONEOS || 5872 lc.cmd == llvm::MachO::LC_VERSION_MIN_TVOS || 5873 lc.cmd == llvm::MachO::LC_VERSION_MIN_WATCHOS) { 5874 if (m_data.GetU32(&offset, &lc.version, 5875 (sizeof(lc) / sizeof(uint32_t)) - 2)) { 5876 const uint32_t xxxx = lc.sdk >> 16; 5877 const uint32_t yy = (lc.sdk >> 8) & 0xffu; 5878 const uint32_t zz = lc.sdk & 0xffu; 5879 if (xxxx) { 5880 m_sdk_versions.push_back(xxxx); 5881 m_sdk_versions.push_back(yy); 5882 m_sdk_versions.push_back(zz); 5883 success = true; 5884 } else { 5885 GetModule()->ReportWarning( 5886 "minimum OS version load command with invalid (0) version found."); 5887 } 5888 } 5889 } 5890 offset = load_cmd_offset + lc.cmdsize; 5891 } 5892 5893 if (!success) { 5894 offset = MachHeaderSizeFromMagic(m_header.magic); 5895 for (uint32_t i = 0; !success && i < m_header.ncmds; ++i) { 5896 const lldb::offset_t load_cmd_offset = offset; 5897 5898 version_min_command lc; 5899 if (m_data.GetU32(&offset, &lc.cmd, 2) == NULL) 5900 break; 5901 if (lc.cmd == llvm::MachO::LC_BUILD_VERSION) { 5902 // struct build_version_command { 5903 // uint32_t cmd; /* LC_BUILD_VERSION */ 5904 // uint32_t cmdsize; /* sizeof(struct 5905 // build_version_command) plus */ 5906 // /* ntools * sizeof(struct 5907 // build_tool_version) */ 5908 // uint32_t platform; /* platform */ 5909 // uint32_t minos; /* X.Y.Z is encoded in nibbles 5910 // xxxx.yy.zz */ uint32_t sdk; /* X.Y.Z is encoded 5911 // in nibbles xxxx.yy.zz */ uint32_t ntools; /* number 5912 // of tool entries following this */ 5913 // }; 5914 5915 offset += 4; // skip platform 5916 uint32_t minos = m_data.GetU32(&offset); 5917 5918 const uint32_t xxxx = minos >> 16; 5919 const uint32_t yy = (minos >> 8) & 0xffu; 5920 const uint32_t zz = minos & 0xffu; 5921 if (xxxx) { 5922 m_sdk_versions.push_back(xxxx); 5923 m_sdk_versions.push_back(yy); 5924 m_sdk_versions.push_back(zz); 5925 success = true; 5926 } 5927 } 5928 offset = load_cmd_offset + lc.cmdsize; 5929 } 5930 } 5931 5932 if (!success) { 5933 // Push an invalid value so we don't try to find 5934 // the version # again on the next call to this 5935 // method. 5936 m_sdk_versions.push_back(UINT32_MAX); 5937 } 5938 } 5939 5940 // Legitimate version numbers will have 3 entries pushed 5941 // on to m_sdk_versions. If we only have one value, it's 5942 // the sentinel value indicating that this object file 5943 // does not have a valid minimum os version #. 5944 if (m_sdk_versions.size() > 1) { 5945 if (versions != NULL && num_versions > 0) { 5946 for (size_t i = 0; i < num_versions; ++i) { 5947 if (i < m_sdk_versions.size()) 5948 versions[i] = m_sdk_versions[i]; 5949 else 5950 versions[i] = 0; 5951 } 5952 } 5953 return m_sdk_versions.size(); 5954 } 5955 // Call the superclasses version that will empty out the data 5956 return ObjectFile::GetSDKVersion(versions, num_versions); 5957 } 5958 5959 bool ObjectFileMachO::GetIsDynamicLinkEditor() { 5960 return m_header.filetype == llvm::MachO::MH_DYLINKER; 5961 } 5962 5963 bool ObjectFileMachO::AllowAssemblyEmulationUnwindPlans() { 5964 return m_allow_assembly_emulation_unwind_plans; 5965 } 5966 5967 //------------------------------------------------------------------ 5968 // PluginInterface protocol 5969 //------------------------------------------------------------------ 5970 lldb_private::ConstString ObjectFileMachO::GetPluginName() { 5971 return GetPluginNameStatic(); 5972 } 5973 5974 uint32_t ObjectFileMachO::GetPluginVersion() { return 1; } 5975 5976 Section *ObjectFileMachO::GetMachHeaderSection() { 5977 // Find the first address of the mach header which is the first non-zero file 5978 // sized section whose file offset is zero. This is the base file address of 5979 // the mach-o file which can be subtracted from the vmaddr of the other 5980 // segments found in memory and added to the load address 5981 ModuleSP module_sp = GetModule(); 5982 if (module_sp) { 5983 SectionList *section_list = GetSectionList(); 5984 if (section_list) { 5985 lldb::addr_t mach_base_file_addr = LLDB_INVALID_ADDRESS; 5986 const size_t num_sections = section_list->GetSize(); 5987 5988 for (size_t sect_idx = 0; sect_idx < num_sections && 5989 mach_base_file_addr == LLDB_INVALID_ADDRESS; 5990 ++sect_idx) { 5991 Section *section = section_list->GetSectionAtIndex(sect_idx).get(); 5992 if (section && section->GetFileSize() > 0 && 5993 section->GetFileOffset() == 0 && !section->IsThreadSpecific() && 5994 module_sp.get() == section->GetModule().get()) { 5995 return section; 5996 } 5997 } 5998 } 5999 } 6000 return nullptr; 6001 } 6002 6003 lldb::addr_t ObjectFileMachO::CalculateSectionLoadAddressForMemoryImage( 6004 lldb::addr_t mach_header_load_address, const Section *mach_header_section, 6005 const Section *section) { 6006 ModuleSP module_sp = GetModule(); 6007 if (module_sp && mach_header_section && section && 6008 mach_header_load_address != LLDB_INVALID_ADDRESS) { 6009 lldb::addr_t mach_header_file_addr = mach_header_section->GetFileAddress(); 6010 if (mach_header_file_addr != LLDB_INVALID_ADDRESS) { 6011 if (section && section->GetFileSize() > 0 && 6012 !section->IsThreadSpecific() && 6013 module_sp.get() == section->GetModule().get()) { 6014 // Ignore __LINKEDIT and __DWARF segments 6015 if (section->GetName() == GetSegmentNameLINKEDIT()) { 6016 // Only map __LINKEDIT if we have an in memory image and this isn't a 6017 // kernel binary like a kext or mach_kernel. 6018 const bool is_memory_image = (bool)m_process_wp.lock(); 6019 const Strata strata = GetStrata(); 6020 if (!is_memory_image || strata == eStrataKernel) 6021 return LLDB_INVALID_ADDRESS; 6022 } 6023 return section->GetFileAddress() - mach_header_file_addr + 6024 mach_header_load_address; 6025 } 6026 } 6027 } 6028 return LLDB_INVALID_ADDRESS; 6029 } 6030 6031 bool ObjectFileMachO::SetLoadAddress(Target &target, lldb::addr_t value, 6032 bool value_is_offset) { 6033 ModuleSP module_sp = GetModule(); 6034 if (module_sp) { 6035 size_t num_loaded_sections = 0; 6036 SectionList *section_list = GetSectionList(); 6037 if (section_list) { 6038 const size_t num_sections = section_list->GetSize(); 6039 6040 if (value_is_offset) { 6041 // "value" is an offset to apply to each top level segment 6042 for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) { 6043 // Iterate through the object file sections to find all of the 6044 // sections that size on disk (to avoid __PAGEZERO) and load them 6045 SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx)); 6046 if (section_sp && section_sp->GetFileSize() > 0 && 6047 !section_sp->IsThreadSpecific() && 6048 module_sp.get() == section_sp->GetModule().get()) { 6049 // Ignore __LINKEDIT and __DWARF segments 6050 if (section_sp->GetName() == GetSegmentNameLINKEDIT()) { 6051 // Only map __LINKEDIT if we have an in memory image and this 6052 // isn't a kernel binary like a kext or mach_kernel. 6053 const bool is_memory_image = (bool)m_process_wp.lock(); 6054 const Strata strata = GetStrata(); 6055 if (!is_memory_image || strata == eStrataKernel) 6056 continue; 6057 } 6058 if (target.GetSectionLoadList().SetSectionLoadAddress( 6059 section_sp, section_sp->GetFileAddress() + value)) 6060 ++num_loaded_sections; 6061 } 6062 } 6063 } else { 6064 // "value" is the new base address of the mach_header, adjust each 6065 // section accordingly 6066 6067 Section *mach_header_section = GetMachHeaderSection(); 6068 if (mach_header_section) { 6069 for (size_t sect_idx = 0; sect_idx < num_sections; ++sect_idx) { 6070 SectionSP section_sp(section_list->GetSectionAtIndex(sect_idx)); 6071 6072 lldb::addr_t section_load_addr = 6073 CalculateSectionLoadAddressForMemoryImage( 6074 value, mach_header_section, section_sp.get()); 6075 if (section_load_addr != LLDB_INVALID_ADDRESS) { 6076 if (target.GetSectionLoadList().SetSectionLoadAddress( 6077 section_sp, section_load_addr)) 6078 ++num_loaded_sections; 6079 } 6080 } 6081 } 6082 } 6083 } 6084 return num_loaded_sections > 0; 6085 } 6086 return false; 6087 } 6088 6089 bool ObjectFileMachO::SaveCore(const lldb::ProcessSP &process_sp, 6090 const FileSpec &outfile, Status &error) { 6091 if (process_sp) { 6092 Target &target = process_sp->GetTarget(); 6093 const ArchSpec target_arch = target.GetArchitecture(); 6094 const llvm::Triple &target_triple = target_arch.GetTriple(); 6095 if (target_triple.getVendor() == llvm::Triple::Apple && 6096 (target_triple.getOS() == llvm::Triple::MacOSX || 6097 target_triple.getOS() == llvm::Triple::IOS || 6098 target_triple.getOS() == llvm::Triple::WatchOS || 6099 target_triple.getOS() == llvm::Triple::TvOS)) { 6100 // NEED_BRIDGEOS_TRIPLE target_triple.getOS() == llvm::Triple::BridgeOS)) { 6101 bool make_core = false; 6102 switch (target_arch.GetMachine()) { 6103 case llvm::Triple::aarch64: 6104 case llvm::Triple::arm: 6105 case llvm::Triple::thumb: 6106 case llvm::Triple::x86: 6107 case llvm::Triple::x86_64: 6108 make_core = true; 6109 break; 6110 default: 6111 error.SetErrorStringWithFormat("unsupported core architecture: %s", 6112 target_triple.str().c_str()); 6113 break; 6114 } 6115 6116 if (make_core) { 6117 std::vector<segment_command_64> segment_load_commands; 6118 // uint32_t range_info_idx = 0; 6119 MemoryRegionInfo range_info; 6120 Status range_error = process_sp->GetMemoryRegionInfo(0, range_info); 6121 const uint32_t addr_byte_size = target_arch.GetAddressByteSize(); 6122 const ByteOrder byte_order = target_arch.GetByteOrder(); 6123 if (range_error.Success()) { 6124 while (range_info.GetRange().GetRangeBase() != LLDB_INVALID_ADDRESS) { 6125 const addr_t addr = range_info.GetRange().GetRangeBase(); 6126 const addr_t size = range_info.GetRange().GetByteSize(); 6127 6128 if (size == 0) 6129 break; 6130 6131 // Calculate correct protections 6132 uint32_t prot = 0; 6133 if (range_info.GetReadable() == MemoryRegionInfo::eYes) 6134 prot |= VM_PROT_READ; 6135 if (range_info.GetWritable() == MemoryRegionInfo::eYes) 6136 prot |= VM_PROT_WRITE; 6137 if (range_info.GetExecutable() == MemoryRegionInfo::eYes) 6138 prot |= VM_PROT_EXECUTE; 6139 6140 // printf ("[%3u] [0x%16.16" PRIx64 " - 6141 // 0x%16.16" PRIx64 ") %c%c%c\n", 6142 // range_info_idx, 6143 // addr, 6144 // size, 6145 // (prot & VM_PROT_READ ) ? 'r' : 6146 // '-', 6147 // (prot & VM_PROT_WRITE ) ? 'w' : 6148 // '-', 6149 // (prot & VM_PROT_EXECUTE) ? 'x' : 6150 // '-'); 6151 6152 if (prot != 0) { 6153 uint32_t cmd_type = LC_SEGMENT_64; 6154 uint32_t segment_size = sizeof(segment_command_64); 6155 if (addr_byte_size == 4) { 6156 cmd_type = LC_SEGMENT; 6157 segment_size = sizeof(segment_command); 6158 } 6159 segment_command_64 segment = { 6160 cmd_type, // uint32_t cmd; 6161 segment_size, // uint32_t cmdsize; 6162 {0}, // char segname[16]; 6163 addr, // uint64_t vmaddr; // uint32_t for 32-bit Mach-O 6164 size, // uint64_t vmsize; // uint32_t for 32-bit Mach-O 6165 0, // uint64_t fileoff; // uint32_t for 32-bit Mach-O 6166 size, // uint64_t filesize; // uint32_t for 32-bit Mach-O 6167 prot, // uint32_t maxprot; 6168 prot, // uint32_t initprot; 6169 0, // uint32_t nsects; 6170 0}; // uint32_t flags; 6171 segment_load_commands.push_back(segment); 6172 } else { 6173 // No protections and a size of 1 used to be returned from old 6174 // debugservers when we asked about a region that was past the 6175 // last memory region and it indicates the end... 6176 if (size == 1) 6177 break; 6178 } 6179 6180 range_error = process_sp->GetMemoryRegionInfo( 6181 range_info.GetRange().GetRangeEnd(), range_info); 6182 if (range_error.Fail()) 6183 break; 6184 } 6185 6186 StreamString buffer(Stream::eBinary, addr_byte_size, byte_order); 6187 6188 mach_header_64 mach_header; 6189 if (addr_byte_size == 8) { 6190 mach_header.magic = MH_MAGIC_64; 6191 } else { 6192 mach_header.magic = MH_MAGIC; 6193 } 6194 mach_header.cputype = target_arch.GetMachOCPUType(); 6195 mach_header.cpusubtype = target_arch.GetMachOCPUSubType(); 6196 mach_header.filetype = MH_CORE; 6197 mach_header.ncmds = segment_load_commands.size(); 6198 mach_header.flags = 0; 6199 mach_header.reserved = 0; 6200 ThreadList &thread_list = process_sp->GetThreadList(); 6201 const uint32_t num_threads = thread_list.GetSize(); 6202 6203 // Make an array of LC_THREAD data items. Each one contains the 6204 // contents of the LC_THREAD load command. The data doesn't contain 6205 // the load command + load command size, we will add the load command 6206 // and load command size as we emit the data. 6207 std::vector<StreamString> LC_THREAD_datas(num_threads); 6208 for (auto &LC_THREAD_data : LC_THREAD_datas) { 6209 LC_THREAD_data.GetFlags().Set(Stream::eBinary); 6210 LC_THREAD_data.SetAddressByteSize(addr_byte_size); 6211 LC_THREAD_data.SetByteOrder(byte_order); 6212 } 6213 for (uint32_t thread_idx = 0; thread_idx < num_threads; 6214 ++thread_idx) { 6215 ThreadSP thread_sp(thread_list.GetThreadAtIndex(thread_idx)); 6216 if (thread_sp) { 6217 switch (mach_header.cputype) { 6218 case llvm::MachO::CPU_TYPE_ARM64: 6219 RegisterContextDarwin_arm64_Mach::Create_LC_THREAD( 6220 thread_sp.get(), LC_THREAD_datas[thread_idx]); 6221 break; 6222 6223 case llvm::MachO::CPU_TYPE_ARM: 6224 RegisterContextDarwin_arm_Mach::Create_LC_THREAD( 6225 thread_sp.get(), LC_THREAD_datas[thread_idx]); 6226 break; 6227 6228 case llvm::MachO::CPU_TYPE_I386: 6229 RegisterContextDarwin_i386_Mach::Create_LC_THREAD( 6230 thread_sp.get(), LC_THREAD_datas[thread_idx]); 6231 break; 6232 6233 case llvm::MachO::CPU_TYPE_X86_64: 6234 RegisterContextDarwin_x86_64_Mach::Create_LC_THREAD( 6235 thread_sp.get(), LC_THREAD_datas[thread_idx]); 6236 break; 6237 } 6238 } 6239 } 6240 6241 // The size of the load command is the size of the segments... 6242 if (addr_byte_size == 8) { 6243 mach_header.sizeofcmds = segment_load_commands.size() * 6244 sizeof(struct segment_command_64); 6245 } else { 6246 mach_header.sizeofcmds = 6247 segment_load_commands.size() * sizeof(struct segment_command); 6248 } 6249 6250 // and the size of all LC_THREAD load command 6251 for (const auto &LC_THREAD_data : LC_THREAD_datas) { 6252 ++mach_header.ncmds; 6253 mach_header.sizeofcmds += 8 + LC_THREAD_data.GetSize(); 6254 } 6255 6256 printf("mach_header: 0x%8.8x 0x%8.8x 0x%8.8x 0x%8.8x 0x%8.8x 0x%8.8x " 6257 "0x%8.8x 0x%8.8x\n", 6258 mach_header.magic, mach_header.cputype, mach_header.cpusubtype, 6259 mach_header.filetype, mach_header.ncmds, 6260 mach_header.sizeofcmds, mach_header.flags, 6261 mach_header.reserved); 6262 6263 // Write the mach header 6264 buffer.PutHex32(mach_header.magic); 6265 buffer.PutHex32(mach_header.cputype); 6266 buffer.PutHex32(mach_header.cpusubtype); 6267 buffer.PutHex32(mach_header.filetype); 6268 buffer.PutHex32(mach_header.ncmds); 6269 buffer.PutHex32(mach_header.sizeofcmds); 6270 buffer.PutHex32(mach_header.flags); 6271 if (addr_byte_size == 8) { 6272 buffer.PutHex32(mach_header.reserved); 6273 } 6274 6275 // Skip the mach header and all load commands and align to the next 6276 // 0x1000 byte boundary 6277 addr_t file_offset = buffer.GetSize() + mach_header.sizeofcmds; 6278 if (file_offset & 0x00000fff) { 6279 file_offset += 0x00001000ull; 6280 file_offset &= (~0x00001000ull + 1); 6281 } 6282 6283 for (auto &segment : segment_load_commands) { 6284 segment.fileoff = file_offset; 6285 file_offset += segment.filesize; 6286 } 6287 6288 // Write out all of the LC_THREAD load commands 6289 for (const auto &LC_THREAD_data : LC_THREAD_datas) { 6290 const size_t LC_THREAD_data_size = LC_THREAD_data.GetSize(); 6291 buffer.PutHex32(LC_THREAD); 6292 buffer.PutHex32(8 + LC_THREAD_data_size); // cmd + cmdsize + data 6293 buffer.Write(LC_THREAD_data.GetString().data(), 6294 LC_THREAD_data_size); 6295 } 6296 6297 // Write out all of the segment load commands 6298 for (const auto &segment : segment_load_commands) { 6299 printf("0x%8.8x 0x%8.8x [0x%16.16" PRIx64 " - 0x%16.16" PRIx64 6300 ") [0x%16.16" PRIx64 " 0x%16.16" PRIx64 6301 ") 0x%8.8x 0x%8.8x 0x%8.8x 0x%8.8x]\n", 6302 segment.cmd, segment.cmdsize, segment.vmaddr, 6303 segment.vmaddr + segment.vmsize, segment.fileoff, 6304 segment.filesize, segment.maxprot, segment.initprot, 6305 segment.nsects, segment.flags); 6306 6307 buffer.PutHex32(segment.cmd); 6308 buffer.PutHex32(segment.cmdsize); 6309 buffer.PutRawBytes(segment.segname, sizeof(segment.segname)); 6310 if (addr_byte_size == 8) { 6311 buffer.PutHex64(segment.vmaddr); 6312 buffer.PutHex64(segment.vmsize); 6313 buffer.PutHex64(segment.fileoff); 6314 buffer.PutHex64(segment.filesize); 6315 } else { 6316 buffer.PutHex32(static_cast<uint32_t>(segment.vmaddr)); 6317 buffer.PutHex32(static_cast<uint32_t>(segment.vmsize)); 6318 buffer.PutHex32(static_cast<uint32_t>(segment.fileoff)); 6319 buffer.PutHex32(static_cast<uint32_t>(segment.filesize)); 6320 } 6321 buffer.PutHex32(segment.maxprot); 6322 buffer.PutHex32(segment.initprot); 6323 buffer.PutHex32(segment.nsects); 6324 buffer.PutHex32(segment.flags); 6325 } 6326 6327 File core_file; 6328 std::string core_file_path(outfile.GetPath()); 6329 error = FileSystem::Instance().Open(core_file, outfile, 6330 File::eOpenOptionWrite | 6331 File::eOpenOptionTruncate | 6332 File::eOpenOptionCanCreate); 6333 if (error.Success()) { 6334 // Read 1 page at a time 6335 uint8_t bytes[0x1000]; 6336 // Write the mach header and load commands out to the core file 6337 size_t bytes_written = buffer.GetString().size(); 6338 error = core_file.Write(buffer.GetString().data(), bytes_written); 6339 if (error.Success()) { 6340 // Now write the file data for all memory segments in the process 6341 for (const auto &segment : segment_load_commands) { 6342 if (core_file.SeekFromStart(segment.fileoff) == -1) { 6343 error.SetErrorStringWithFormat( 6344 "unable to seek to offset 0x%" PRIx64 " in '%s'", 6345 segment.fileoff, core_file_path.c_str()); 6346 break; 6347 } 6348 6349 printf("Saving %" PRId64 6350 " bytes of data for memory region at 0x%" PRIx64 "\n", 6351 segment.vmsize, segment.vmaddr); 6352 addr_t bytes_left = segment.vmsize; 6353 addr_t addr = segment.vmaddr; 6354 Status memory_read_error; 6355 while (bytes_left > 0 && error.Success()) { 6356 const size_t bytes_to_read = 6357 bytes_left > sizeof(bytes) ? sizeof(bytes) : bytes_left; 6358 const size_t bytes_read = process_sp->ReadMemory( 6359 addr, bytes, bytes_to_read, memory_read_error); 6360 if (bytes_read == bytes_to_read) { 6361 size_t bytes_written = bytes_read; 6362 error = core_file.Write(bytes, bytes_written); 6363 bytes_left -= bytes_read; 6364 addr += bytes_read; 6365 } else { 6366 // Some pages within regions are not readable, those should 6367 // be zero filled 6368 memset(bytes, 0, bytes_to_read); 6369 size_t bytes_written = bytes_to_read; 6370 error = core_file.Write(bytes, bytes_written); 6371 bytes_left -= bytes_to_read; 6372 addr += bytes_to_read; 6373 } 6374 } 6375 } 6376 } 6377 } 6378 } else { 6379 error.SetErrorString( 6380 "process doesn't support getting memory region info"); 6381 } 6382 } 6383 return true; // This is the right plug to handle saving core files for 6384 // this process 6385 } 6386 } 6387 return false; 6388 } 6389