1 //===-- COFFDump.cpp - COFF-specific dumper ---------------------*- 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 /// \file 11 /// \brief This file implements the COFF-specific dumper for llvm-objdump. 12 /// It outputs the Win64 EH data structures as plain text. 13 /// The encoding of the unwind codes is described in MSDN: 14 /// http://msdn.microsoft.com/en-us/library/ck9asaa9.aspx 15 /// 16 //===----------------------------------------------------------------------===// 17 18 #include "llvm-objdump.h" 19 #include "llvm/Object/COFF.h" 20 #include "llvm/Object/ObjectFile.h" 21 #include "llvm/Support/Format.h" 22 #include "llvm/Support/SourceMgr.h" 23 #include "llvm/Support/Win64EH.h" 24 #include "llvm/Support/raw_ostream.h" 25 #include <algorithm> 26 #include <cstring> 27 #include <system_error> 28 29 using namespace llvm; 30 using namespace object; 31 using namespace llvm::Win64EH; 32 33 // Returns the name of the unwind code. 34 static StringRef getUnwindCodeTypeName(uint8_t Code) { 35 switch(Code) { 36 default: llvm_unreachable("Invalid unwind code"); 37 case UOP_PushNonVol: return "UOP_PushNonVol"; 38 case UOP_AllocLarge: return "UOP_AllocLarge"; 39 case UOP_AllocSmall: return "UOP_AllocSmall"; 40 case UOP_SetFPReg: return "UOP_SetFPReg"; 41 case UOP_SaveNonVol: return "UOP_SaveNonVol"; 42 case UOP_SaveNonVolBig: return "UOP_SaveNonVolBig"; 43 case UOP_SaveXMM128: return "UOP_SaveXMM128"; 44 case UOP_SaveXMM128Big: return "UOP_SaveXMM128Big"; 45 case UOP_PushMachFrame: return "UOP_PushMachFrame"; 46 } 47 } 48 49 // Returns the name of a referenced register. 50 static StringRef getUnwindRegisterName(uint8_t Reg) { 51 switch(Reg) { 52 default: llvm_unreachable("Invalid register"); 53 case 0: return "RAX"; 54 case 1: return "RCX"; 55 case 2: return "RDX"; 56 case 3: return "RBX"; 57 case 4: return "RSP"; 58 case 5: return "RBP"; 59 case 6: return "RSI"; 60 case 7: return "RDI"; 61 case 8: return "R8"; 62 case 9: return "R9"; 63 case 10: return "R10"; 64 case 11: return "R11"; 65 case 12: return "R12"; 66 case 13: return "R13"; 67 case 14: return "R14"; 68 case 15: return "R15"; 69 } 70 } 71 72 // Calculates the number of array slots required for the unwind code. 73 static unsigned getNumUsedSlots(const UnwindCode &UnwindCode) { 74 switch (UnwindCode.getUnwindOp()) { 75 default: llvm_unreachable("Invalid unwind code"); 76 case UOP_PushNonVol: 77 case UOP_AllocSmall: 78 case UOP_SetFPReg: 79 case UOP_PushMachFrame: 80 return 1; 81 case UOP_SaveNonVol: 82 case UOP_SaveXMM128: 83 return 2; 84 case UOP_SaveNonVolBig: 85 case UOP_SaveXMM128Big: 86 return 3; 87 case UOP_AllocLarge: 88 return (UnwindCode.getOpInfo() == 0) ? 2 : 3; 89 } 90 } 91 92 // Prints one unwind code. Because an unwind code can occupy up to 3 slots in 93 // the unwind codes array, this function requires that the correct number of 94 // slots is provided. 95 static void printUnwindCode(ArrayRef<UnwindCode> UCs) { 96 assert(UCs.size() >= getNumUsedSlots(UCs[0])); 97 outs() << format(" 0x%02x: ", unsigned(UCs[0].u.CodeOffset)) 98 << getUnwindCodeTypeName(UCs[0].getUnwindOp()); 99 switch (UCs[0].getUnwindOp()) { 100 case UOP_PushNonVol: 101 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo()); 102 break; 103 case UOP_AllocLarge: 104 if (UCs[0].getOpInfo() == 0) { 105 outs() << " " << UCs[1].FrameOffset; 106 } else { 107 outs() << " " << UCs[1].FrameOffset 108 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16); 109 } 110 break; 111 case UOP_AllocSmall: 112 outs() << " " << ((UCs[0].getOpInfo() + 1) * 8); 113 break; 114 case UOP_SetFPReg: 115 outs() << " "; 116 break; 117 case UOP_SaveNonVol: 118 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo()) 119 << format(" [0x%04x]", 8 * UCs[1].FrameOffset); 120 break; 121 case UOP_SaveNonVolBig: 122 outs() << " " << getUnwindRegisterName(UCs[0].getOpInfo()) 123 << format(" [0x%08x]", UCs[1].FrameOffset 124 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16)); 125 break; 126 case UOP_SaveXMM128: 127 outs() << " XMM" << static_cast<uint32_t>(UCs[0].getOpInfo()) 128 << format(" [0x%04x]", 16 * UCs[1].FrameOffset); 129 break; 130 case UOP_SaveXMM128Big: 131 outs() << " XMM" << UCs[0].getOpInfo() 132 << format(" [0x%08x]", UCs[1].FrameOffset 133 + (static_cast<uint32_t>(UCs[2].FrameOffset) << 16)); 134 break; 135 case UOP_PushMachFrame: 136 outs() << " " << (UCs[0].getOpInfo() ? "w/o" : "w") 137 << " error code"; 138 break; 139 } 140 outs() << "\n"; 141 } 142 143 static void printAllUnwindCodes(ArrayRef<UnwindCode> UCs) { 144 for (const UnwindCode *I = UCs.begin(), *E = UCs.end(); I < E; ) { 145 unsigned UsedSlots = getNumUsedSlots(*I); 146 if (UsedSlots > UCs.size()) { 147 outs() << "Unwind data corrupted: Encountered unwind op " 148 << getUnwindCodeTypeName((*I).getUnwindOp()) 149 << " which requires " << UsedSlots 150 << " slots, but only " << UCs.size() 151 << " remaining in buffer"; 152 return ; 153 } 154 printUnwindCode(makeArrayRef(I, E)); 155 I += UsedSlots; 156 } 157 } 158 159 // Given a symbol sym this functions returns the address and section of it. 160 static std::error_code 161 resolveSectionAndAddress(const COFFObjectFile *Obj, const SymbolRef &Sym, 162 const coff_section *&ResolvedSection, 163 uint64_t &ResolvedAddr) { 164 Expected<uint64_t> ResolvedAddrOrErr = Sym.getAddress(); 165 if (!ResolvedAddrOrErr) 166 return errorToErrorCode(ResolvedAddrOrErr.takeError()); 167 ResolvedAddr = *ResolvedAddrOrErr; 168 Expected<section_iterator> Iter = Sym.getSection(); 169 if (!Iter) 170 return errorToErrorCode(Iter.takeError()); 171 ResolvedSection = Obj->getCOFFSection(**Iter); 172 return std::error_code(); 173 } 174 175 // Given a vector of relocations for a section and an offset into this section 176 // the function returns the symbol used for the relocation at the offset. 177 static std::error_code resolveSymbol(const std::vector<RelocationRef> &Rels, 178 uint64_t Offset, SymbolRef &Sym) { 179 for (std::vector<RelocationRef>::const_iterator I = Rels.begin(), 180 E = Rels.end(); 181 I != E; ++I) { 182 uint64_t Ofs = I->getOffset(); 183 if (Ofs == Offset) { 184 Sym = *I->getSymbol(); 185 return std::error_code(); 186 } 187 } 188 return object_error::parse_failed; 189 } 190 191 // Given a vector of relocations for a section and an offset into this section 192 // the function resolves the symbol used for the relocation at the offset and 193 // returns the section content and the address inside the content pointed to 194 // by the symbol. 195 static std::error_code 196 getSectionContents(const COFFObjectFile *Obj, 197 const std::vector<RelocationRef> &Rels, uint64_t Offset, 198 ArrayRef<uint8_t> &Contents, uint64_t &Addr) { 199 SymbolRef Sym; 200 if (std::error_code EC = resolveSymbol(Rels, Offset, Sym)) 201 return EC; 202 const coff_section *Section; 203 if (std::error_code EC = resolveSectionAndAddress(Obj, Sym, Section, Addr)) 204 return EC; 205 if (std::error_code EC = Obj->getSectionContents(Section, Contents)) 206 return EC; 207 return std::error_code(); 208 } 209 210 // Given a vector of relocations for a section and an offset into this section 211 // the function returns the name of the symbol used for the relocation at the 212 // offset. 213 static std::error_code resolveSymbolName(const std::vector<RelocationRef> &Rels, 214 uint64_t Offset, StringRef &Name) { 215 SymbolRef Sym; 216 if (std::error_code EC = resolveSymbol(Rels, Offset, Sym)) 217 return EC; 218 Expected<StringRef> NameOrErr = Sym.getName(); 219 if (!NameOrErr) 220 return errorToErrorCode(NameOrErr.takeError()); 221 Name = *NameOrErr; 222 return std::error_code(); 223 } 224 225 static void printCOFFSymbolAddress(llvm::raw_ostream &Out, 226 const std::vector<RelocationRef> &Rels, 227 uint64_t Offset, uint32_t Disp) { 228 StringRef Sym; 229 if (!resolveSymbolName(Rels, Offset, Sym)) { 230 Out << Sym; 231 if (Disp > 0) 232 Out << format(" + 0x%04x", Disp); 233 } else { 234 Out << format("0x%04x", Disp); 235 } 236 } 237 238 static void 239 printSEHTable(const COFFObjectFile *Obj, uint32_t TableVA, int Count) { 240 if (Count == 0) 241 return; 242 243 const pe32_header *PE32Header; 244 error(Obj->getPE32Header(PE32Header)); 245 uint32_t ImageBase = PE32Header->ImageBase; 246 uintptr_t IntPtr = 0; 247 error(Obj->getVaPtr(TableVA, IntPtr)); 248 const support::ulittle32_t *P = (const support::ulittle32_t *)IntPtr; 249 outs() << "SEH Table:"; 250 for (int I = 0; I < Count; ++I) 251 outs() << format(" 0x%x", P[I] + ImageBase); 252 outs() << "\n\n"; 253 } 254 255 template <typename T> 256 static void printTLSDirectoryT(const coff_tls_directory<T> *TLSDir) { 257 size_t FormatWidth = sizeof(T) * 2; 258 outs() << "TLS directory:" 259 << "\n StartAddressOfRawData: " 260 << format_hex(TLSDir->StartAddressOfRawData, FormatWidth) 261 << "\n EndAddressOfRawData: " 262 << format_hex(TLSDir->EndAddressOfRawData, FormatWidth) 263 << "\n AddressOfIndex: " 264 << format_hex(TLSDir->AddressOfIndex, FormatWidth) 265 << "\n AddressOfCallBacks: " 266 << format_hex(TLSDir->AddressOfCallBacks, FormatWidth) 267 << "\n SizeOfZeroFill: " 268 << TLSDir->SizeOfZeroFill 269 << "\n Characteristics: " 270 << TLSDir->Characteristics 271 << "\n Alignment: " 272 << TLSDir->getAlignment() 273 << "\n\n"; 274 } 275 276 static void printTLSDirectory(const COFFObjectFile *Obj) { 277 const pe32_header *PE32Header; 278 error(Obj->getPE32Header(PE32Header)); 279 280 const pe32plus_header *PE32PlusHeader; 281 error(Obj->getPE32PlusHeader(PE32PlusHeader)); 282 283 // Skip if it's not executable. 284 if (!PE32Header && !PE32PlusHeader) 285 return; 286 287 const data_directory *DataDir; 288 error(Obj->getDataDirectory(COFF::TLS_TABLE, DataDir)); 289 uintptr_t IntPtr = 0; 290 if (DataDir->RelativeVirtualAddress == 0) 291 return; 292 error(Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr)); 293 294 if (PE32Header) { 295 auto *TLSDir = reinterpret_cast<const coff_tls_directory32 *>(IntPtr); 296 printTLSDirectoryT(TLSDir); 297 } else { 298 auto *TLSDir = reinterpret_cast<const coff_tls_directory64 *>(IntPtr); 299 printTLSDirectoryT(TLSDir); 300 } 301 302 outs() << "\n"; 303 } 304 305 static void printLoadConfiguration(const COFFObjectFile *Obj) { 306 // Skip if it's not executable. 307 const pe32_header *PE32Header; 308 error(Obj->getPE32Header(PE32Header)); 309 if (!PE32Header) 310 return; 311 312 // Currently only x86 is supported 313 if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_I386) 314 return; 315 316 const data_directory *DataDir; 317 error(Obj->getDataDirectory(COFF::LOAD_CONFIG_TABLE, DataDir)); 318 uintptr_t IntPtr = 0; 319 if (DataDir->RelativeVirtualAddress == 0) 320 return; 321 error(Obj->getRvaPtr(DataDir->RelativeVirtualAddress, IntPtr)); 322 323 auto *LoadConf = reinterpret_cast<const coff_load_configuration32 *>(IntPtr); 324 outs() << "Load configuration:" 325 << "\n Timestamp: " << LoadConf->TimeDateStamp 326 << "\n Major Version: " << LoadConf->MajorVersion 327 << "\n Minor Version: " << LoadConf->MinorVersion 328 << "\n GlobalFlags Clear: " << LoadConf->GlobalFlagsClear 329 << "\n GlobalFlags Set: " << LoadConf->GlobalFlagsSet 330 << "\n Critical Section Default Timeout: " << LoadConf->CriticalSectionDefaultTimeout 331 << "\n Decommit Free Block Threshold: " << LoadConf->DeCommitFreeBlockThreshold 332 << "\n Decommit Total Free Threshold: " << LoadConf->DeCommitTotalFreeThreshold 333 << "\n Lock Prefix Table: " << LoadConf->LockPrefixTable 334 << "\n Maximum Allocation Size: " << LoadConf->MaximumAllocationSize 335 << "\n Virtual Memory Threshold: " << LoadConf->VirtualMemoryThreshold 336 << "\n Process Affinity Mask: " << LoadConf->ProcessAffinityMask 337 << "\n Process Heap Flags: " << LoadConf->ProcessHeapFlags 338 << "\n CSD Version: " << LoadConf->CSDVersion 339 << "\n Security Cookie: " << LoadConf->SecurityCookie 340 << "\n SEH Table: " << LoadConf->SEHandlerTable 341 << "\n SEH Count: " << LoadConf->SEHandlerCount 342 << "\n\n"; 343 printSEHTable(Obj, LoadConf->SEHandlerTable, LoadConf->SEHandlerCount); 344 outs() << "\n"; 345 } 346 347 // Prints import tables. The import table is a table containing the list of 348 // DLL name and symbol names which will be linked by the loader. 349 static void printImportTables(const COFFObjectFile *Obj) { 350 import_directory_iterator I = Obj->import_directory_begin(); 351 import_directory_iterator E = Obj->import_directory_end(); 352 if (I == E) 353 return; 354 outs() << "The Import Tables:\n"; 355 for (const ImportDirectoryEntryRef &DirRef : Obj->import_directories()) { 356 const import_directory_table_entry *Dir; 357 StringRef Name; 358 if (DirRef.getImportTableEntry(Dir)) return; 359 if (DirRef.getName(Name)) return; 360 361 outs() << format(" lookup %08x time %08x fwd %08x name %08x addr %08x\n\n", 362 static_cast<uint32_t>(Dir->ImportLookupTableRVA), 363 static_cast<uint32_t>(Dir->TimeDateStamp), 364 static_cast<uint32_t>(Dir->ForwarderChain), 365 static_cast<uint32_t>(Dir->NameRVA), 366 static_cast<uint32_t>(Dir->ImportAddressTableRVA)); 367 outs() << " DLL Name: " << Name << "\n"; 368 outs() << " Hint/Ord Name\n"; 369 for (const ImportedSymbolRef &Entry : DirRef.imported_symbols()) { 370 bool IsOrdinal; 371 if (Entry.isOrdinal(IsOrdinal)) 372 return; 373 if (IsOrdinal) { 374 uint16_t Ordinal; 375 if (Entry.getOrdinal(Ordinal)) 376 return; 377 outs() << format(" % 6d\n", Ordinal); 378 continue; 379 } 380 uint32_t HintNameRVA; 381 if (Entry.getHintNameRVA(HintNameRVA)) 382 return; 383 uint16_t Hint; 384 StringRef Name; 385 if (Obj->getHintName(HintNameRVA, Hint, Name)) 386 return; 387 outs() << format(" % 6d ", Hint) << Name << "\n"; 388 } 389 outs() << "\n"; 390 } 391 } 392 393 // Prints export tables. The export table is a table containing the list of 394 // exported symbol from the DLL. 395 static void printExportTable(const COFFObjectFile *Obj) { 396 outs() << "Export Table:\n"; 397 export_directory_iterator I = Obj->export_directory_begin(); 398 export_directory_iterator E = Obj->export_directory_end(); 399 if (I == E) 400 return; 401 StringRef DllName; 402 uint32_t OrdinalBase; 403 if (I->getDllName(DllName)) 404 return; 405 if (I->getOrdinalBase(OrdinalBase)) 406 return; 407 outs() << " DLL name: " << DllName << "\n"; 408 outs() << " Ordinal base: " << OrdinalBase << "\n"; 409 outs() << " Ordinal RVA Name\n"; 410 for (; I != E; I = ++I) { 411 uint32_t Ordinal; 412 if (I->getOrdinal(Ordinal)) 413 return; 414 uint32_t RVA; 415 if (I->getExportRVA(RVA)) 416 return; 417 bool IsForwarder; 418 if (I->isForwarder(IsForwarder)) 419 return; 420 421 if (IsForwarder) { 422 // Export table entries can be used to re-export symbols that 423 // this COFF file is imported from some DLLs. This is rare. 424 // In most cases IsForwarder is false. 425 outs() << format(" % 4d ", Ordinal); 426 } else { 427 outs() << format(" % 4d %# 8x", Ordinal, RVA); 428 } 429 430 StringRef Name; 431 if (I->getSymbolName(Name)) 432 continue; 433 if (!Name.empty()) 434 outs() << " " << Name; 435 if (IsForwarder) { 436 StringRef S; 437 if (I->getForwardTo(S)) 438 return; 439 outs() << " (forwarded to " << S << ")"; 440 } 441 outs() << "\n"; 442 } 443 } 444 445 // Given the COFF object file, this function returns the relocations for .pdata 446 // and the pointer to "runtime function" structs. 447 static bool getPDataSection(const COFFObjectFile *Obj, 448 std::vector<RelocationRef> &Rels, 449 const RuntimeFunction *&RFStart, int &NumRFs) { 450 for (const SectionRef &Section : Obj->sections()) { 451 StringRef Name; 452 error(Section.getName(Name)); 453 if (Name != ".pdata") 454 continue; 455 456 const coff_section *Pdata = Obj->getCOFFSection(Section); 457 for (const RelocationRef &Reloc : Section.relocations()) 458 Rels.push_back(Reloc); 459 460 // Sort relocations by address. 461 std::sort(Rels.begin(), Rels.end(), RelocAddressLess); 462 463 ArrayRef<uint8_t> Contents; 464 error(Obj->getSectionContents(Pdata, Contents)); 465 if (Contents.empty()) 466 continue; 467 468 RFStart = reinterpret_cast<const RuntimeFunction *>(Contents.data()); 469 NumRFs = Contents.size() / sizeof(RuntimeFunction); 470 return true; 471 } 472 return false; 473 } 474 475 static void printWin64EHUnwindInfo(const Win64EH::UnwindInfo *UI) { 476 // The casts to int are required in order to output the value as number. 477 // Without the casts the value would be interpreted as char data (which 478 // results in garbage output). 479 outs() << " Version: " << static_cast<int>(UI->getVersion()) << "\n"; 480 outs() << " Flags: " << static_cast<int>(UI->getFlags()); 481 if (UI->getFlags()) { 482 if (UI->getFlags() & UNW_ExceptionHandler) 483 outs() << " UNW_ExceptionHandler"; 484 if (UI->getFlags() & UNW_TerminateHandler) 485 outs() << " UNW_TerminateHandler"; 486 if (UI->getFlags() & UNW_ChainInfo) 487 outs() << " UNW_ChainInfo"; 488 } 489 outs() << "\n"; 490 outs() << " Size of prolog: " << static_cast<int>(UI->PrologSize) << "\n"; 491 outs() << " Number of Codes: " << static_cast<int>(UI->NumCodes) << "\n"; 492 // Maybe this should move to output of UOP_SetFPReg? 493 if (UI->getFrameRegister()) { 494 outs() << " Frame register: " 495 << getUnwindRegisterName(UI->getFrameRegister()) << "\n"; 496 outs() << " Frame offset: " << 16 * UI->getFrameOffset() << "\n"; 497 } else { 498 outs() << " No frame pointer used\n"; 499 } 500 if (UI->getFlags() & (UNW_ExceptionHandler | UNW_TerminateHandler)) { 501 // FIXME: Output exception handler data 502 } else if (UI->getFlags() & UNW_ChainInfo) { 503 // FIXME: Output chained unwind info 504 } 505 506 if (UI->NumCodes) 507 outs() << " Unwind Codes:\n"; 508 509 printAllUnwindCodes(makeArrayRef(&UI->UnwindCodes[0], UI->NumCodes)); 510 511 outs() << "\n"; 512 outs().flush(); 513 } 514 515 /// Prints out the given RuntimeFunction struct for x64, assuming that Obj is 516 /// pointing to an executable file. 517 static void printRuntimeFunction(const COFFObjectFile *Obj, 518 const RuntimeFunction &RF) { 519 if (!RF.StartAddress) 520 return; 521 outs() << "Function Table:\n" 522 << format(" Start Address: 0x%04x\n", 523 static_cast<uint32_t>(RF.StartAddress)) 524 << format(" End Address: 0x%04x\n", 525 static_cast<uint32_t>(RF.EndAddress)) 526 << format(" Unwind Info Address: 0x%04x\n", 527 static_cast<uint32_t>(RF.UnwindInfoOffset)); 528 uintptr_t addr; 529 if (Obj->getRvaPtr(RF.UnwindInfoOffset, addr)) 530 return; 531 printWin64EHUnwindInfo(reinterpret_cast<const Win64EH::UnwindInfo *>(addr)); 532 } 533 534 /// Prints out the given RuntimeFunction struct for x64, assuming that Obj is 535 /// pointing to an object file. Unlike executable, fields in RuntimeFunction 536 /// struct are filled with zeros, but instead there are relocations pointing to 537 /// them so that the linker will fill targets' RVAs to the fields at link 538 /// time. This function interprets the relocations to find the data to be used 539 /// in the resulting executable. 540 static void printRuntimeFunctionRels(const COFFObjectFile *Obj, 541 const RuntimeFunction &RF, 542 uint64_t SectionOffset, 543 const std::vector<RelocationRef> &Rels) { 544 outs() << "Function Table:\n"; 545 outs() << " Start Address: "; 546 printCOFFSymbolAddress(outs(), Rels, 547 SectionOffset + 548 /*offsetof(RuntimeFunction, StartAddress)*/ 0, 549 RF.StartAddress); 550 outs() << "\n"; 551 552 outs() << " End Address: "; 553 printCOFFSymbolAddress(outs(), Rels, 554 SectionOffset + 555 /*offsetof(RuntimeFunction, EndAddress)*/ 4, 556 RF.EndAddress); 557 outs() << "\n"; 558 559 outs() << " Unwind Info Address: "; 560 printCOFFSymbolAddress(outs(), Rels, 561 SectionOffset + 562 /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8, 563 RF.UnwindInfoOffset); 564 outs() << "\n"; 565 566 ArrayRef<uint8_t> XContents; 567 uint64_t UnwindInfoOffset = 0; 568 error(getSectionContents( 569 Obj, Rels, SectionOffset + 570 /*offsetof(RuntimeFunction, UnwindInfoOffset)*/ 8, 571 XContents, UnwindInfoOffset)); 572 if (XContents.empty()) 573 return; 574 575 UnwindInfoOffset += RF.UnwindInfoOffset; 576 if (UnwindInfoOffset > XContents.size()) 577 return; 578 579 auto *UI = reinterpret_cast<const Win64EH::UnwindInfo *>(XContents.data() + 580 UnwindInfoOffset); 581 printWin64EHUnwindInfo(UI); 582 } 583 584 void llvm::printCOFFUnwindInfo(const COFFObjectFile *Obj) { 585 if (Obj->getMachine() != COFF::IMAGE_FILE_MACHINE_AMD64) { 586 errs() << "Unsupported image machine type " 587 "(currently only AMD64 is supported).\n"; 588 return; 589 } 590 591 std::vector<RelocationRef> Rels; 592 const RuntimeFunction *RFStart; 593 int NumRFs; 594 if (!getPDataSection(Obj, Rels, RFStart, NumRFs)) 595 return; 596 ArrayRef<RuntimeFunction> RFs(RFStart, NumRFs); 597 598 bool IsExecutable = Rels.empty(); 599 if (IsExecutable) { 600 for (const RuntimeFunction &RF : RFs) 601 printRuntimeFunction(Obj, RF); 602 return; 603 } 604 605 for (const RuntimeFunction &RF : RFs) { 606 uint64_t SectionOffset = 607 std::distance(RFs.begin(), &RF) * sizeof(RuntimeFunction); 608 printRuntimeFunctionRels(Obj, RF, SectionOffset, Rels); 609 } 610 } 611 612 void llvm::printCOFFFileHeader(const object::ObjectFile *Obj) { 613 const COFFObjectFile *file = dyn_cast<const COFFObjectFile>(Obj); 614 printTLSDirectory(file); 615 printLoadConfiguration(file); 616 printImportTables(file); 617 printExportTable(file); 618 } 619 620 void llvm::printCOFFSymbolTable(const COFFObjectFile *coff) { 621 for (unsigned SI = 0, SE = coff->getNumberOfSymbols(); SI != SE; ++SI) { 622 ErrorOr<COFFSymbolRef> Symbol = coff->getSymbol(SI); 623 StringRef Name; 624 error(Symbol.getError()); 625 error(coff->getSymbolName(*Symbol, Name)); 626 627 outs() << "[" << format("%2d", SI) << "]" 628 << "(sec " << format("%2d", int(Symbol->getSectionNumber())) << ")" 629 << "(fl 0x00)" // Flag bits, which COFF doesn't have. 630 << "(ty " << format("%3x", unsigned(Symbol->getType())) << ")" 631 << "(scl " << format("%3x", unsigned(Symbol->getStorageClass())) << ") " 632 << "(nx " << unsigned(Symbol->getNumberOfAuxSymbols()) << ") " 633 << "0x" << format("%08x", unsigned(Symbol->getValue())) << " " 634 << Name << "\n"; 635 636 for (unsigned AI = 0, AE = Symbol->getNumberOfAuxSymbols(); AI < AE; ++AI, ++SI) { 637 if (Symbol->isSectionDefinition()) { 638 const coff_aux_section_definition *asd; 639 error(coff->getAuxSymbol<coff_aux_section_definition>(SI + 1, asd)); 640 641 int32_t AuxNumber = asd->getNumber(Symbol->isBigObj()); 642 643 outs() << "AUX " 644 << format("scnlen 0x%x nreloc %d nlnno %d checksum 0x%x " 645 , unsigned(asd->Length) 646 , unsigned(asd->NumberOfRelocations) 647 , unsigned(asd->NumberOfLinenumbers) 648 , unsigned(asd->CheckSum)) 649 << format("assoc %d comdat %d\n" 650 , unsigned(AuxNumber) 651 , unsigned(asd->Selection)); 652 } else if (Symbol->isFileRecord()) { 653 const char *FileName; 654 error(coff->getAuxSymbol<char>(SI + 1, FileName)); 655 656 StringRef Name(FileName, Symbol->getNumberOfAuxSymbols() * 657 coff->getSymbolTableEntrySize()); 658 outs() << "AUX " << Name.rtrim(StringRef("\0", 1)) << '\n'; 659 660 SI = SI + Symbol->getNumberOfAuxSymbols(); 661 break; 662 } else if (Symbol->isWeakExternal()) { 663 const coff_aux_weak_external *awe; 664 error(coff->getAuxSymbol<coff_aux_weak_external>(SI + 1, awe)); 665 666 outs() << "AUX " << format("indx %d srch %d\n", 667 static_cast<uint32_t>(awe->TagIndex), 668 static_cast<uint32_t>(awe->Characteristics)); 669 } else { 670 outs() << "AUX Unknown\n"; 671 } 672 } 673 } 674 } 675