1 //===- MachOObjectFile.cpp - Mach-O object file binding -------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the MachOObjectFile class, which binds the MachOObject 10 // class to the generic ObjectFile wrapper. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/ADT/ArrayRef.h" 15 #include "llvm/ADT/None.h" 16 #include "llvm/ADT/STLExtras.h" 17 #include "llvm/ADT/SmallVector.h" 18 #include "llvm/ADT/StringRef.h" 19 #include "llvm/ADT/StringSwitch.h" 20 #include "llvm/ADT/Triple.h" 21 #include "llvm/ADT/Twine.h" 22 #include "llvm/BinaryFormat/MachO.h" 23 #include "llvm/Object/Error.h" 24 #include "llvm/Object/MachO.h" 25 #include "llvm/Object/ObjectFile.h" 26 #include "llvm/Object/SymbolicFile.h" 27 #include "llvm/Support/DataExtractor.h" 28 #include "llvm/Support/Debug.h" 29 #include "llvm/Support/Error.h" 30 #include "llvm/Support/ErrorHandling.h" 31 #include "llvm/Support/Format.h" 32 #include "llvm/Support/Host.h" 33 #include "llvm/Support/LEB128.h" 34 #include "llvm/Support/MemoryBuffer.h" 35 #include "llvm/Support/SwapByteOrder.h" 36 #include "llvm/Support/raw_ostream.h" 37 #include <algorithm> 38 #include <cassert> 39 #include <cstddef> 40 #include <cstdint> 41 #include <cstring> 42 #include <limits> 43 #include <list> 44 #include <memory> 45 #include <string> 46 #include <system_error> 47 48 using namespace llvm; 49 using namespace object; 50 51 namespace { 52 53 struct section_base { 54 char sectname[16]; 55 char segname[16]; 56 }; 57 58 } // end anonymous namespace 59 60 static Error malformedError(const Twine &Msg) { 61 return make_error<GenericBinaryError>("truncated or malformed object (" + 62 Msg + ")", 63 object_error::parse_failed); 64 } 65 66 // FIXME: Replace all uses of this function with getStructOrErr. 67 template <typename T> 68 static T getStruct(const MachOObjectFile &O, const char *P) { 69 // Don't read before the beginning or past the end of the file 70 if (P < O.getData().begin() || P + sizeof(T) > O.getData().end()) 71 report_fatal_error("Malformed MachO file."); 72 73 T Cmd; 74 memcpy(&Cmd, P, sizeof(T)); 75 if (O.isLittleEndian() != sys::IsLittleEndianHost) 76 MachO::swapStruct(Cmd); 77 return Cmd; 78 } 79 80 template <typename T> 81 static Expected<T> getStructOrErr(const MachOObjectFile &O, const char *P) { 82 // Don't read before the beginning or past the end of the file 83 if (P < O.getData().begin() || P + sizeof(T) > O.getData().end()) 84 return malformedError("Structure read out-of-range"); 85 86 T Cmd; 87 memcpy(&Cmd, P, sizeof(T)); 88 if (O.isLittleEndian() != sys::IsLittleEndianHost) 89 MachO::swapStruct(Cmd); 90 return Cmd; 91 } 92 93 static const char * 94 getSectionPtr(const MachOObjectFile &O, MachOObjectFile::LoadCommandInfo L, 95 unsigned Sec) { 96 uintptr_t CommandAddr = reinterpret_cast<uintptr_t>(L.Ptr); 97 98 bool Is64 = O.is64Bit(); 99 unsigned SegmentLoadSize = Is64 ? sizeof(MachO::segment_command_64) : 100 sizeof(MachO::segment_command); 101 unsigned SectionSize = Is64 ? sizeof(MachO::section_64) : 102 sizeof(MachO::section); 103 104 uintptr_t SectionAddr = CommandAddr + SegmentLoadSize + Sec * SectionSize; 105 return reinterpret_cast<const char*>(SectionAddr); 106 } 107 108 static const char *getPtr(const MachOObjectFile &O, size_t Offset) { 109 assert(Offset <= O.getData().size()); 110 return O.getData().data() + Offset; 111 } 112 113 static MachO::nlist_base 114 getSymbolTableEntryBase(const MachOObjectFile &O, DataRefImpl DRI) { 115 const char *P = reinterpret_cast<const char *>(DRI.p); 116 return getStruct<MachO::nlist_base>(O, P); 117 } 118 119 static StringRef parseSegmentOrSectionName(const char *P) { 120 if (P[15] == 0) 121 // Null terminated. 122 return P; 123 // Not null terminated, so this is a 16 char string. 124 return StringRef(P, 16); 125 } 126 127 static unsigned getCPUType(const MachOObjectFile &O) { 128 return O.getHeader().cputype; 129 } 130 131 static unsigned getCPUSubType(const MachOObjectFile &O) { 132 return O.getHeader().cpusubtype; 133 } 134 135 static uint32_t 136 getPlainRelocationAddress(const MachO::any_relocation_info &RE) { 137 return RE.r_word0; 138 } 139 140 static unsigned 141 getScatteredRelocationAddress(const MachO::any_relocation_info &RE) { 142 return RE.r_word0 & 0xffffff; 143 } 144 145 static bool getPlainRelocationPCRel(const MachOObjectFile &O, 146 const MachO::any_relocation_info &RE) { 147 if (O.isLittleEndian()) 148 return (RE.r_word1 >> 24) & 1; 149 return (RE.r_word1 >> 7) & 1; 150 } 151 152 static bool 153 getScatteredRelocationPCRel(const MachO::any_relocation_info &RE) { 154 return (RE.r_word0 >> 30) & 1; 155 } 156 157 static unsigned getPlainRelocationLength(const MachOObjectFile &O, 158 const MachO::any_relocation_info &RE) { 159 if (O.isLittleEndian()) 160 return (RE.r_word1 >> 25) & 3; 161 return (RE.r_word1 >> 5) & 3; 162 } 163 164 static unsigned 165 getScatteredRelocationLength(const MachO::any_relocation_info &RE) { 166 return (RE.r_word0 >> 28) & 3; 167 } 168 169 static unsigned getPlainRelocationType(const MachOObjectFile &O, 170 const MachO::any_relocation_info &RE) { 171 if (O.isLittleEndian()) 172 return RE.r_word1 >> 28; 173 return RE.r_word1 & 0xf; 174 } 175 176 static uint32_t getSectionFlags(const MachOObjectFile &O, 177 DataRefImpl Sec) { 178 if (O.is64Bit()) { 179 MachO::section_64 Sect = O.getSection64(Sec); 180 return Sect.flags; 181 } 182 MachO::section Sect = O.getSection(Sec); 183 return Sect.flags; 184 } 185 186 static Expected<MachOObjectFile::LoadCommandInfo> 187 getLoadCommandInfo(const MachOObjectFile &Obj, const char *Ptr, 188 uint32_t LoadCommandIndex) { 189 if (auto CmdOrErr = getStructOrErr<MachO::load_command>(Obj, Ptr)) { 190 if (CmdOrErr->cmdsize + Ptr > Obj.getData().end()) 191 return malformedError("load command " + Twine(LoadCommandIndex) + 192 " extends past end of file"); 193 if (CmdOrErr->cmdsize < 8) 194 return malformedError("load command " + Twine(LoadCommandIndex) + 195 " with size less than 8 bytes"); 196 return MachOObjectFile::LoadCommandInfo({Ptr, *CmdOrErr}); 197 } else 198 return CmdOrErr.takeError(); 199 } 200 201 static Expected<MachOObjectFile::LoadCommandInfo> 202 getFirstLoadCommandInfo(const MachOObjectFile &Obj) { 203 unsigned HeaderSize = Obj.is64Bit() ? sizeof(MachO::mach_header_64) 204 : sizeof(MachO::mach_header); 205 if (sizeof(MachO::load_command) > Obj.getHeader().sizeofcmds) 206 return malformedError("load command 0 extends past the end all load " 207 "commands in the file"); 208 return getLoadCommandInfo(Obj, getPtr(Obj, HeaderSize), 0); 209 } 210 211 static Expected<MachOObjectFile::LoadCommandInfo> 212 getNextLoadCommandInfo(const MachOObjectFile &Obj, uint32_t LoadCommandIndex, 213 const MachOObjectFile::LoadCommandInfo &L) { 214 unsigned HeaderSize = Obj.is64Bit() ? sizeof(MachO::mach_header_64) 215 : sizeof(MachO::mach_header); 216 if (L.Ptr + L.C.cmdsize + sizeof(MachO::load_command) > 217 Obj.getData().data() + HeaderSize + Obj.getHeader().sizeofcmds) 218 return malformedError("load command " + Twine(LoadCommandIndex + 1) + 219 " extends past the end all load commands in the file"); 220 return getLoadCommandInfo(Obj, L.Ptr + L.C.cmdsize, LoadCommandIndex + 1); 221 } 222 223 template <typename T> 224 static void parseHeader(const MachOObjectFile &Obj, T &Header, 225 Error &Err) { 226 if (sizeof(T) > Obj.getData().size()) { 227 Err = malformedError("the mach header extends past the end of the " 228 "file"); 229 return; 230 } 231 if (auto HeaderOrErr = getStructOrErr<T>(Obj, getPtr(Obj, 0))) 232 Header = *HeaderOrErr; 233 else 234 Err = HeaderOrErr.takeError(); 235 } 236 237 // This is used to check for overlapping of Mach-O elements. 238 struct MachOElement { 239 uint64_t Offset; 240 uint64_t Size; 241 const char *Name; 242 }; 243 244 static Error checkOverlappingElement(std::list<MachOElement> &Elements, 245 uint64_t Offset, uint64_t Size, 246 const char *Name) { 247 if (Size == 0) 248 return Error::success(); 249 250 for (auto it=Elements.begin() ; it != Elements.end(); ++it) { 251 auto E = *it; 252 if ((Offset >= E.Offset && Offset < E.Offset + E.Size) || 253 (Offset + Size > E.Offset && Offset + Size < E.Offset + E.Size) || 254 (Offset <= E.Offset && Offset + Size >= E.Offset + E.Size)) 255 return malformedError(Twine(Name) + " at offset " + Twine(Offset) + 256 " with a size of " + Twine(Size) + ", overlaps " + 257 E.Name + " at offset " + Twine(E.Offset) + " with " 258 "a size of " + Twine(E.Size)); 259 auto nt = it; 260 nt++; 261 if (nt != Elements.end()) { 262 auto N = *nt; 263 if (Offset + Size <= N.Offset) { 264 Elements.insert(nt, {Offset, Size, Name}); 265 return Error::success(); 266 } 267 } 268 } 269 Elements.push_back({Offset, Size, Name}); 270 return Error::success(); 271 } 272 273 // Parses LC_SEGMENT or LC_SEGMENT_64 load command, adds addresses of all 274 // sections to \param Sections, and optionally sets 275 // \param IsPageZeroSegment to true. 276 template <typename Segment, typename Section> 277 static Error parseSegmentLoadCommand( 278 const MachOObjectFile &Obj, const MachOObjectFile::LoadCommandInfo &Load, 279 SmallVectorImpl<const char *> &Sections, bool &IsPageZeroSegment, 280 uint32_t LoadCommandIndex, const char *CmdName, uint64_t SizeOfHeaders, 281 std::list<MachOElement> &Elements) { 282 const unsigned SegmentLoadSize = sizeof(Segment); 283 if (Load.C.cmdsize < SegmentLoadSize) 284 return malformedError("load command " + Twine(LoadCommandIndex) + 285 " " + CmdName + " cmdsize too small"); 286 if (auto SegOrErr = getStructOrErr<Segment>(Obj, Load.Ptr)) { 287 Segment S = SegOrErr.get(); 288 const unsigned SectionSize = sizeof(Section); 289 uint64_t FileSize = Obj.getData().size(); 290 if (S.nsects > std::numeric_limits<uint32_t>::max() / SectionSize || 291 S.nsects * SectionSize > Load.C.cmdsize - SegmentLoadSize) 292 return malformedError("load command " + Twine(LoadCommandIndex) + 293 " inconsistent cmdsize in " + CmdName + 294 " for the number of sections"); 295 for (unsigned J = 0; J < S.nsects; ++J) { 296 const char *Sec = getSectionPtr(Obj, Load, J); 297 Sections.push_back(Sec); 298 auto SectionOrErr = getStructOrErr<Section>(Obj, Sec); 299 if (!SectionOrErr) 300 return SectionOrErr.takeError(); 301 Section s = SectionOrErr.get(); 302 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 303 Obj.getHeader().filetype != MachO::MH_DSYM && 304 s.flags != MachO::S_ZEROFILL && 305 s.flags != MachO::S_THREAD_LOCAL_ZEROFILL && 306 s.offset > FileSize) 307 return malformedError("offset field of section " + Twine(J) + " in " + 308 CmdName + " command " + Twine(LoadCommandIndex) + 309 " extends past the end of the file"); 310 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 311 Obj.getHeader().filetype != MachO::MH_DSYM && 312 s.flags != MachO::S_ZEROFILL && 313 s.flags != MachO::S_THREAD_LOCAL_ZEROFILL && S.fileoff == 0 && 314 s.offset < SizeOfHeaders && s.size != 0) 315 return malformedError("offset field of section " + Twine(J) + " in " + 316 CmdName + " command " + Twine(LoadCommandIndex) + 317 " not past the headers of the file"); 318 uint64_t BigSize = s.offset; 319 BigSize += s.size; 320 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 321 Obj.getHeader().filetype != MachO::MH_DSYM && 322 s.flags != MachO::S_ZEROFILL && 323 s.flags != MachO::S_THREAD_LOCAL_ZEROFILL && 324 BigSize > FileSize) 325 return malformedError("offset field plus size field of section " + 326 Twine(J) + " in " + CmdName + " command " + 327 Twine(LoadCommandIndex) + 328 " extends past the end of the file"); 329 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 330 Obj.getHeader().filetype != MachO::MH_DSYM && 331 s.flags != MachO::S_ZEROFILL && 332 s.flags != MachO::S_THREAD_LOCAL_ZEROFILL && 333 s.size > S.filesize) 334 return malformedError("size field of section " + 335 Twine(J) + " in " + CmdName + " command " + 336 Twine(LoadCommandIndex) + 337 " greater than the segment"); 338 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 339 Obj.getHeader().filetype != MachO::MH_DSYM && s.size != 0 && 340 s.addr < S.vmaddr) 341 return malformedError("addr field of section " + Twine(J) + " in " + 342 CmdName + " command " + Twine(LoadCommandIndex) + 343 " less than the segment's vmaddr"); 344 BigSize = s.addr; 345 BigSize += s.size; 346 uint64_t BigEnd = S.vmaddr; 347 BigEnd += S.vmsize; 348 if (S.vmsize != 0 && s.size != 0 && BigSize > BigEnd) 349 return malformedError("addr field plus size of section " + Twine(J) + 350 " in " + CmdName + " command " + 351 Twine(LoadCommandIndex) + 352 " greater than than " 353 "the segment's vmaddr plus vmsize"); 354 if (Obj.getHeader().filetype != MachO::MH_DYLIB_STUB && 355 Obj.getHeader().filetype != MachO::MH_DSYM && 356 s.flags != MachO::S_ZEROFILL && 357 s.flags != MachO::S_THREAD_LOCAL_ZEROFILL) 358 if (Error Err = checkOverlappingElement(Elements, s.offset, s.size, 359 "section contents")) 360 return Err; 361 if (s.reloff > FileSize) 362 return malformedError("reloff field of section " + Twine(J) + " in " + 363 CmdName + " command " + Twine(LoadCommandIndex) + 364 " extends past the end of the file"); 365 BigSize = s.nreloc; 366 BigSize *= sizeof(struct MachO::relocation_info); 367 BigSize += s.reloff; 368 if (BigSize > FileSize) 369 return malformedError("reloff field plus nreloc field times sizeof(" 370 "struct relocation_info) of section " + 371 Twine(J) + " in " + CmdName + " command " + 372 Twine(LoadCommandIndex) + 373 " extends past the end of the file"); 374 if (Error Err = checkOverlappingElement(Elements, s.reloff, s.nreloc * 375 sizeof(struct 376 MachO::relocation_info), 377 "section relocation entries")) 378 return Err; 379 } 380 if (S.fileoff > FileSize) 381 return malformedError("load command " + Twine(LoadCommandIndex) + 382 " fileoff field in " + CmdName + 383 " extends past the end of the file"); 384 uint64_t BigSize = S.fileoff; 385 BigSize += S.filesize; 386 if (BigSize > FileSize) 387 return malformedError("load command " + Twine(LoadCommandIndex) + 388 " fileoff field plus filesize field in " + 389 CmdName + " extends past the end of the file"); 390 if (S.vmsize != 0 && S.filesize > S.vmsize) 391 return malformedError("load command " + Twine(LoadCommandIndex) + 392 " filesize field in " + CmdName + 393 " greater than vmsize field"); 394 IsPageZeroSegment |= StringRef("__PAGEZERO").equals(S.segname); 395 } else 396 return SegOrErr.takeError(); 397 398 return Error::success(); 399 } 400 401 static Error checkSymtabCommand(const MachOObjectFile &Obj, 402 const MachOObjectFile::LoadCommandInfo &Load, 403 uint32_t LoadCommandIndex, 404 const char **SymtabLoadCmd, 405 std::list<MachOElement> &Elements) { 406 if (Load.C.cmdsize < sizeof(MachO::symtab_command)) 407 return malformedError("load command " + Twine(LoadCommandIndex) + 408 " LC_SYMTAB cmdsize too small"); 409 if (*SymtabLoadCmd != nullptr) 410 return malformedError("more than one LC_SYMTAB command"); 411 auto SymtabOrErr = getStructOrErr<MachO::symtab_command>(Obj, Load.Ptr); 412 if (!SymtabOrErr) 413 return SymtabOrErr.takeError(); 414 MachO::symtab_command Symtab = SymtabOrErr.get(); 415 if (Symtab.cmdsize != sizeof(MachO::symtab_command)) 416 return malformedError("LC_SYMTAB command " + Twine(LoadCommandIndex) + 417 " has incorrect cmdsize"); 418 uint64_t FileSize = Obj.getData().size(); 419 if (Symtab.symoff > FileSize) 420 return malformedError("symoff field of LC_SYMTAB command " + 421 Twine(LoadCommandIndex) + " extends past the end " 422 "of the file"); 423 uint64_t SymtabSize = Symtab.nsyms; 424 const char *struct_nlist_name; 425 if (Obj.is64Bit()) { 426 SymtabSize *= sizeof(MachO::nlist_64); 427 struct_nlist_name = "struct nlist_64"; 428 } else { 429 SymtabSize *= sizeof(MachO::nlist); 430 struct_nlist_name = "struct nlist"; 431 } 432 uint64_t BigSize = SymtabSize; 433 BigSize += Symtab.symoff; 434 if (BigSize > FileSize) 435 return malformedError("symoff field plus nsyms field times sizeof(" + 436 Twine(struct_nlist_name) + ") of LC_SYMTAB command " + 437 Twine(LoadCommandIndex) + " extends past the end " 438 "of the file"); 439 if (Error Err = checkOverlappingElement(Elements, Symtab.symoff, SymtabSize, 440 "symbol table")) 441 return Err; 442 if (Symtab.stroff > FileSize) 443 return malformedError("stroff field of LC_SYMTAB command " + 444 Twine(LoadCommandIndex) + " extends past the end " 445 "of the file"); 446 BigSize = Symtab.stroff; 447 BigSize += Symtab.strsize; 448 if (BigSize > FileSize) 449 return malformedError("stroff field plus strsize field of LC_SYMTAB " 450 "command " + Twine(LoadCommandIndex) + " extends " 451 "past the end of the file"); 452 if (Error Err = checkOverlappingElement(Elements, Symtab.stroff, 453 Symtab.strsize, "string table")) 454 return Err; 455 *SymtabLoadCmd = Load.Ptr; 456 return Error::success(); 457 } 458 459 static Error checkDysymtabCommand(const MachOObjectFile &Obj, 460 const MachOObjectFile::LoadCommandInfo &Load, 461 uint32_t LoadCommandIndex, 462 const char **DysymtabLoadCmd, 463 std::list<MachOElement> &Elements) { 464 if (Load.C.cmdsize < sizeof(MachO::dysymtab_command)) 465 return malformedError("load command " + Twine(LoadCommandIndex) + 466 " LC_DYSYMTAB cmdsize too small"); 467 if (*DysymtabLoadCmd != nullptr) 468 return malformedError("more than one LC_DYSYMTAB command"); 469 auto DysymtabOrErr = 470 getStructOrErr<MachO::dysymtab_command>(Obj, Load.Ptr); 471 if (!DysymtabOrErr) 472 return DysymtabOrErr.takeError(); 473 MachO::dysymtab_command Dysymtab = DysymtabOrErr.get(); 474 if (Dysymtab.cmdsize != sizeof(MachO::dysymtab_command)) 475 return malformedError("LC_DYSYMTAB command " + Twine(LoadCommandIndex) + 476 " has incorrect cmdsize"); 477 uint64_t FileSize = Obj.getData().size(); 478 if (Dysymtab.tocoff > FileSize) 479 return malformedError("tocoff field of LC_DYSYMTAB command " + 480 Twine(LoadCommandIndex) + " extends past the end of " 481 "the file"); 482 uint64_t BigSize = Dysymtab.ntoc; 483 BigSize *= sizeof(MachO::dylib_table_of_contents); 484 BigSize += Dysymtab.tocoff; 485 if (BigSize > FileSize) 486 return malformedError("tocoff field plus ntoc field times sizeof(struct " 487 "dylib_table_of_contents) of LC_DYSYMTAB command " + 488 Twine(LoadCommandIndex) + " extends past the end of " 489 "the file"); 490 if (Error Err = checkOverlappingElement(Elements, Dysymtab.tocoff, 491 Dysymtab.ntoc * sizeof(struct 492 MachO::dylib_table_of_contents), 493 "table of contents")) 494 return Err; 495 if (Dysymtab.modtaboff > FileSize) 496 return malformedError("modtaboff field of LC_DYSYMTAB command " + 497 Twine(LoadCommandIndex) + " extends past the end of " 498 "the file"); 499 BigSize = Dysymtab.nmodtab; 500 const char *struct_dylib_module_name; 501 uint64_t sizeof_modtab; 502 if (Obj.is64Bit()) { 503 sizeof_modtab = sizeof(MachO::dylib_module_64); 504 struct_dylib_module_name = "struct dylib_module_64"; 505 } else { 506 sizeof_modtab = sizeof(MachO::dylib_module); 507 struct_dylib_module_name = "struct dylib_module"; 508 } 509 BigSize *= sizeof_modtab; 510 BigSize += Dysymtab.modtaboff; 511 if (BigSize > FileSize) 512 return malformedError("modtaboff field plus nmodtab field times sizeof(" + 513 Twine(struct_dylib_module_name) + ") of LC_DYSYMTAB " 514 "command " + Twine(LoadCommandIndex) + " extends " 515 "past the end of the file"); 516 if (Error Err = checkOverlappingElement(Elements, Dysymtab.modtaboff, 517 Dysymtab.nmodtab * sizeof_modtab, 518 "module table")) 519 return Err; 520 if (Dysymtab.extrefsymoff > FileSize) 521 return malformedError("extrefsymoff field of LC_DYSYMTAB command " + 522 Twine(LoadCommandIndex) + " extends past the end of " 523 "the file"); 524 BigSize = Dysymtab.nextrefsyms; 525 BigSize *= sizeof(MachO::dylib_reference); 526 BigSize += Dysymtab.extrefsymoff; 527 if (BigSize > FileSize) 528 return malformedError("extrefsymoff field plus nextrefsyms field times " 529 "sizeof(struct dylib_reference) of LC_DYSYMTAB " 530 "command " + Twine(LoadCommandIndex) + " extends " 531 "past the end of the file"); 532 if (Error Err = checkOverlappingElement(Elements, Dysymtab.extrefsymoff, 533 Dysymtab.nextrefsyms * 534 sizeof(MachO::dylib_reference), 535 "reference table")) 536 return Err; 537 if (Dysymtab.indirectsymoff > FileSize) 538 return malformedError("indirectsymoff field of LC_DYSYMTAB command " + 539 Twine(LoadCommandIndex) + " extends past the end of " 540 "the file"); 541 BigSize = Dysymtab.nindirectsyms; 542 BigSize *= sizeof(uint32_t); 543 BigSize += Dysymtab.indirectsymoff; 544 if (BigSize > FileSize) 545 return malformedError("indirectsymoff field plus nindirectsyms field times " 546 "sizeof(uint32_t) of LC_DYSYMTAB command " + 547 Twine(LoadCommandIndex) + " extends past the end of " 548 "the file"); 549 if (Error Err = checkOverlappingElement(Elements, Dysymtab.indirectsymoff, 550 Dysymtab.nindirectsyms * 551 sizeof(uint32_t), 552 "indirect table")) 553 return Err; 554 if (Dysymtab.extreloff > FileSize) 555 return malformedError("extreloff field of LC_DYSYMTAB command " + 556 Twine(LoadCommandIndex) + " extends past the end of " 557 "the file"); 558 BigSize = Dysymtab.nextrel; 559 BigSize *= sizeof(MachO::relocation_info); 560 BigSize += Dysymtab.extreloff; 561 if (BigSize > FileSize) 562 return malformedError("extreloff field plus nextrel field times sizeof" 563 "(struct relocation_info) of LC_DYSYMTAB command " + 564 Twine(LoadCommandIndex) + " extends past the end of " 565 "the file"); 566 if (Error Err = checkOverlappingElement(Elements, Dysymtab.extreloff, 567 Dysymtab.nextrel * 568 sizeof(MachO::relocation_info), 569 "external relocation table")) 570 return Err; 571 if (Dysymtab.locreloff > FileSize) 572 return malformedError("locreloff field of LC_DYSYMTAB command " + 573 Twine(LoadCommandIndex) + " extends past the end of " 574 "the file"); 575 BigSize = Dysymtab.nlocrel; 576 BigSize *= sizeof(MachO::relocation_info); 577 BigSize += Dysymtab.locreloff; 578 if (BigSize > FileSize) 579 return malformedError("locreloff field plus nlocrel field times sizeof" 580 "(struct relocation_info) of LC_DYSYMTAB command " + 581 Twine(LoadCommandIndex) + " extends past the end of " 582 "the file"); 583 if (Error Err = checkOverlappingElement(Elements, Dysymtab.locreloff, 584 Dysymtab.nlocrel * 585 sizeof(MachO::relocation_info), 586 "local relocation table")) 587 return Err; 588 *DysymtabLoadCmd = Load.Ptr; 589 return Error::success(); 590 } 591 592 static Error checkLinkeditDataCommand(const MachOObjectFile &Obj, 593 const MachOObjectFile::LoadCommandInfo &Load, 594 uint32_t LoadCommandIndex, 595 const char **LoadCmd, const char *CmdName, 596 std::list<MachOElement> &Elements, 597 const char *ElementName) { 598 if (Load.C.cmdsize < sizeof(MachO::linkedit_data_command)) 599 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 600 CmdName + " cmdsize too small"); 601 if (*LoadCmd != nullptr) 602 return malformedError("more than one " + Twine(CmdName) + " command"); 603 auto LinkDataOrError = 604 getStructOrErr<MachO::linkedit_data_command>(Obj, Load.Ptr); 605 if (!LinkDataOrError) 606 return LinkDataOrError.takeError(); 607 MachO::linkedit_data_command LinkData = LinkDataOrError.get(); 608 if (LinkData.cmdsize != sizeof(MachO::linkedit_data_command)) 609 return malformedError(Twine(CmdName) + " command " + 610 Twine(LoadCommandIndex) + " has incorrect cmdsize"); 611 uint64_t FileSize = Obj.getData().size(); 612 if (LinkData.dataoff > FileSize) 613 return malformedError("dataoff field of " + Twine(CmdName) + " command " + 614 Twine(LoadCommandIndex) + " extends past the end of " 615 "the file"); 616 uint64_t BigSize = LinkData.dataoff; 617 BigSize += LinkData.datasize; 618 if (BigSize > FileSize) 619 return malformedError("dataoff field plus datasize field of " + 620 Twine(CmdName) + " command " + 621 Twine(LoadCommandIndex) + " extends past the end of " 622 "the file"); 623 if (Error Err = checkOverlappingElement(Elements, LinkData.dataoff, 624 LinkData.datasize, ElementName)) 625 return Err; 626 *LoadCmd = Load.Ptr; 627 return Error::success(); 628 } 629 630 static Error checkDyldInfoCommand(const MachOObjectFile &Obj, 631 const MachOObjectFile::LoadCommandInfo &Load, 632 uint32_t LoadCommandIndex, 633 const char **LoadCmd, const char *CmdName, 634 std::list<MachOElement> &Elements) { 635 if (Load.C.cmdsize < sizeof(MachO::dyld_info_command)) 636 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 637 CmdName + " cmdsize too small"); 638 if (*LoadCmd != nullptr) 639 return malformedError("more than one LC_DYLD_INFO and or LC_DYLD_INFO_ONLY " 640 "command"); 641 auto DyldInfoOrErr = 642 getStructOrErr<MachO::dyld_info_command>(Obj, Load.Ptr); 643 if (!DyldInfoOrErr) 644 return DyldInfoOrErr.takeError(); 645 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 646 if (DyldInfo.cmdsize != sizeof(MachO::dyld_info_command)) 647 return malformedError(Twine(CmdName) + " command " + 648 Twine(LoadCommandIndex) + " has incorrect cmdsize"); 649 uint64_t FileSize = Obj.getData().size(); 650 if (DyldInfo.rebase_off > FileSize) 651 return malformedError("rebase_off field of " + Twine(CmdName) + 652 " command " + Twine(LoadCommandIndex) + " extends " 653 "past the end of the file"); 654 uint64_t BigSize = DyldInfo.rebase_off; 655 BigSize += DyldInfo.rebase_size; 656 if (BigSize > FileSize) 657 return malformedError("rebase_off field plus rebase_size field of " + 658 Twine(CmdName) + " command " + 659 Twine(LoadCommandIndex) + " extends past the end of " 660 "the file"); 661 if (Error Err = checkOverlappingElement(Elements, DyldInfo.rebase_off, 662 DyldInfo.rebase_size, 663 "dyld rebase info")) 664 return Err; 665 if (DyldInfo.bind_off > FileSize) 666 return malformedError("bind_off field of " + Twine(CmdName) + 667 " command " + Twine(LoadCommandIndex) + " extends " 668 "past the end of the file"); 669 BigSize = DyldInfo.bind_off; 670 BigSize += DyldInfo.bind_size; 671 if (BigSize > FileSize) 672 return malformedError("bind_off field plus bind_size field of " + 673 Twine(CmdName) + " command " + 674 Twine(LoadCommandIndex) + " extends past the end of " 675 "the file"); 676 if (Error Err = checkOverlappingElement(Elements, DyldInfo.bind_off, 677 DyldInfo.bind_size, 678 "dyld bind info")) 679 return Err; 680 if (DyldInfo.weak_bind_off > FileSize) 681 return malformedError("weak_bind_off field of " + Twine(CmdName) + 682 " command " + Twine(LoadCommandIndex) + " extends " 683 "past the end of the file"); 684 BigSize = DyldInfo.weak_bind_off; 685 BigSize += DyldInfo.weak_bind_size; 686 if (BigSize > FileSize) 687 return malformedError("weak_bind_off field plus weak_bind_size field of " + 688 Twine(CmdName) + " command " + 689 Twine(LoadCommandIndex) + " extends past the end of " 690 "the file"); 691 if (Error Err = checkOverlappingElement(Elements, DyldInfo.weak_bind_off, 692 DyldInfo.weak_bind_size, 693 "dyld weak bind info")) 694 return Err; 695 if (DyldInfo.lazy_bind_off > FileSize) 696 return malformedError("lazy_bind_off field of " + Twine(CmdName) + 697 " command " + Twine(LoadCommandIndex) + " extends " 698 "past the end of the file"); 699 BigSize = DyldInfo.lazy_bind_off; 700 BigSize += DyldInfo.lazy_bind_size; 701 if (BigSize > FileSize) 702 return malformedError("lazy_bind_off field plus lazy_bind_size field of " + 703 Twine(CmdName) + " command " + 704 Twine(LoadCommandIndex) + " extends past the end of " 705 "the file"); 706 if (Error Err = checkOverlappingElement(Elements, DyldInfo.lazy_bind_off, 707 DyldInfo.lazy_bind_size, 708 "dyld lazy bind info")) 709 return Err; 710 if (DyldInfo.export_off > FileSize) 711 return malformedError("export_off field of " + Twine(CmdName) + 712 " command " + Twine(LoadCommandIndex) + " extends " 713 "past the end of the file"); 714 BigSize = DyldInfo.export_off; 715 BigSize += DyldInfo.export_size; 716 if (BigSize > FileSize) 717 return malformedError("export_off field plus export_size field of " + 718 Twine(CmdName) + " command " + 719 Twine(LoadCommandIndex) + " extends past the end of " 720 "the file"); 721 if (Error Err = checkOverlappingElement(Elements, DyldInfo.export_off, 722 DyldInfo.export_size, 723 "dyld export info")) 724 return Err; 725 *LoadCmd = Load.Ptr; 726 return Error::success(); 727 } 728 729 static Error checkDylibCommand(const MachOObjectFile &Obj, 730 const MachOObjectFile::LoadCommandInfo &Load, 731 uint32_t LoadCommandIndex, const char *CmdName) { 732 if (Load.C.cmdsize < sizeof(MachO::dylib_command)) 733 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 734 CmdName + " cmdsize too small"); 735 auto CommandOrErr = getStructOrErr<MachO::dylib_command>(Obj, Load.Ptr); 736 if (!CommandOrErr) 737 return CommandOrErr.takeError(); 738 MachO::dylib_command D = CommandOrErr.get(); 739 if (D.dylib.name < sizeof(MachO::dylib_command)) 740 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 741 CmdName + " name.offset field too small, not past " 742 "the end of the dylib_command struct"); 743 if (D.dylib.name >= D.cmdsize) 744 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 745 CmdName + " name.offset field extends past the end " 746 "of the load command"); 747 // Make sure there is a null between the starting offset of the name and 748 // the end of the load command. 749 uint32_t i; 750 const char *P = (const char *)Load.Ptr; 751 for (i = D.dylib.name; i < D.cmdsize; i++) 752 if (P[i] == '\0') 753 break; 754 if (i >= D.cmdsize) 755 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 756 CmdName + " library name extends past the end of the " 757 "load command"); 758 return Error::success(); 759 } 760 761 static Error checkDylibIdCommand(const MachOObjectFile &Obj, 762 const MachOObjectFile::LoadCommandInfo &Load, 763 uint32_t LoadCommandIndex, 764 const char **LoadCmd) { 765 if (Error Err = checkDylibCommand(Obj, Load, LoadCommandIndex, 766 "LC_ID_DYLIB")) 767 return Err; 768 if (*LoadCmd != nullptr) 769 return malformedError("more than one LC_ID_DYLIB command"); 770 if (Obj.getHeader().filetype != MachO::MH_DYLIB && 771 Obj.getHeader().filetype != MachO::MH_DYLIB_STUB) 772 return malformedError("LC_ID_DYLIB load command in non-dynamic library " 773 "file type"); 774 *LoadCmd = Load.Ptr; 775 return Error::success(); 776 } 777 778 static Error checkDyldCommand(const MachOObjectFile &Obj, 779 const MachOObjectFile::LoadCommandInfo &Load, 780 uint32_t LoadCommandIndex, const char *CmdName) { 781 if (Load.C.cmdsize < sizeof(MachO::dylinker_command)) 782 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 783 CmdName + " cmdsize too small"); 784 auto CommandOrErr = getStructOrErr<MachO::dylinker_command>(Obj, Load.Ptr); 785 if (!CommandOrErr) 786 return CommandOrErr.takeError(); 787 MachO::dylinker_command D = CommandOrErr.get(); 788 if (D.name < sizeof(MachO::dylinker_command)) 789 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 790 CmdName + " name.offset field too small, not past " 791 "the end of the dylinker_command struct"); 792 if (D.name >= D.cmdsize) 793 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 794 CmdName + " name.offset field extends past the end " 795 "of the load command"); 796 // Make sure there is a null between the starting offset of the name and 797 // the end of the load command. 798 uint32_t i; 799 const char *P = (const char *)Load.Ptr; 800 for (i = D.name; i < D.cmdsize; i++) 801 if (P[i] == '\0') 802 break; 803 if (i >= D.cmdsize) 804 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 805 CmdName + " dyld name extends past the end of the " 806 "load command"); 807 return Error::success(); 808 } 809 810 static Error checkVersCommand(const MachOObjectFile &Obj, 811 const MachOObjectFile::LoadCommandInfo &Load, 812 uint32_t LoadCommandIndex, 813 const char **LoadCmd, const char *CmdName) { 814 if (Load.C.cmdsize != sizeof(MachO::version_min_command)) 815 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 816 CmdName + " has incorrect cmdsize"); 817 if (*LoadCmd != nullptr) 818 return malformedError("more than one LC_VERSION_MIN_MACOSX, " 819 "LC_VERSION_MIN_IPHONEOS, LC_VERSION_MIN_TVOS or " 820 "LC_VERSION_MIN_WATCHOS command"); 821 *LoadCmd = Load.Ptr; 822 return Error::success(); 823 } 824 825 static Error checkNoteCommand(const MachOObjectFile &Obj, 826 const MachOObjectFile::LoadCommandInfo &Load, 827 uint32_t LoadCommandIndex, 828 std::list<MachOElement> &Elements) { 829 if (Load.C.cmdsize != sizeof(MachO::note_command)) 830 return malformedError("load command " + Twine(LoadCommandIndex) + 831 " LC_NOTE has incorrect cmdsize"); 832 auto NoteCmdOrErr = getStructOrErr<MachO::note_command>(Obj, Load.Ptr); 833 if (!NoteCmdOrErr) 834 return NoteCmdOrErr.takeError(); 835 MachO::note_command Nt = NoteCmdOrErr.get(); 836 uint64_t FileSize = Obj.getData().size(); 837 if (Nt.offset > FileSize) 838 return malformedError("offset field of LC_NOTE command " + 839 Twine(LoadCommandIndex) + " extends " 840 "past the end of the file"); 841 uint64_t BigSize = Nt.offset; 842 BigSize += Nt.size; 843 if (BigSize > FileSize) 844 return malformedError("size field plus offset field of LC_NOTE command " + 845 Twine(LoadCommandIndex) + " extends past the end of " 846 "the file"); 847 if (Error Err = checkOverlappingElement(Elements, Nt.offset, Nt.size, 848 "LC_NOTE data")) 849 return Err; 850 return Error::success(); 851 } 852 853 static Error 854 parseBuildVersionCommand(const MachOObjectFile &Obj, 855 const MachOObjectFile::LoadCommandInfo &Load, 856 SmallVectorImpl<const char*> &BuildTools, 857 uint32_t LoadCommandIndex) { 858 auto BVCOrErr = 859 getStructOrErr<MachO::build_version_command>(Obj, Load.Ptr); 860 if (!BVCOrErr) 861 return BVCOrErr.takeError(); 862 MachO::build_version_command BVC = BVCOrErr.get(); 863 if (Load.C.cmdsize != 864 sizeof(MachO::build_version_command) + 865 BVC.ntools * sizeof(MachO::build_tool_version)) 866 return malformedError("load command " + Twine(LoadCommandIndex) + 867 " LC_BUILD_VERSION_COMMAND has incorrect cmdsize"); 868 869 auto Start = Load.Ptr + sizeof(MachO::build_version_command); 870 BuildTools.resize(BVC.ntools); 871 for (unsigned i = 0; i < BVC.ntools; ++i) 872 BuildTools[i] = Start + i * sizeof(MachO::build_tool_version); 873 874 return Error::success(); 875 } 876 877 static Error checkRpathCommand(const MachOObjectFile &Obj, 878 const MachOObjectFile::LoadCommandInfo &Load, 879 uint32_t LoadCommandIndex) { 880 if (Load.C.cmdsize < sizeof(MachO::rpath_command)) 881 return malformedError("load command " + Twine(LoadCommandIndex) + 882 " LC_RPATH cmdsize too small"); 883 auto ROrErr = getStructOrErr<MachO::rpath_command>(Obj, Load.Ptr); 884 if (!ROrErr) 885 return ROrErr.takeError(); 886 MachO::rpath_command R = ROrErr.get(); 887 if (R.path < sizeof(MachO::rpath_command)) 888 return malformedError("load command " + Twine(LoadCommandIndex) + 889 " LC_RPATH path.offset field too small, not past " 890 "the end of the rpath_command struct"); 891 if (R.path >= R.cmdsize) 892 return malformedError("load command " + Twine(LoadCommandIndex) + 893 " LC_RPATH path.offset field extends past the end " 894 "of the load command"); 895 // Make sure there is a null between the starting offset of the path and 896 // the end of the load command. 897 uint32_t i; 898 const char *P = (const char *)Load.Ptr; 899 for (i = R.path; i < R.cmdsize; i++) 900 if (P[i] == '\0') 901 break; 902 if (i >= R.cmdsize) 903 return malformedError("load command " + Twine(LoadCommandIndex) + 904 " LC_RPATH library name extends past the end of the " 905 "load command"); 906 return Error::success(); 907 } 908 909 static Error checkEncryptCommand(const MachOObjectFile &Obj, 910 const MachOObjectFile::LoadCommandInfo &Load, 911 uint32_t LoadCommandIndex, 912 uint64_t cryptoff, uint64_t cryptsize, 913 const char **LoadCmd, const char *CmdName) { 914 if (*LoadCmd != nullptr) 915 return malformedError("more than one LC_ENCRYPTION_INFO and or " 916 "LC_ENCRYPTION_INFO_64 command"); 917 uint64_t FileSize = Obj.getData().size(); 918 if (cryptoff > FileSize) 919 return malformedError("cryptoff field of " + Twine(CmdName) + 920 " command " + Twine(LoadCommandIndex) + " extends " 921 "past the end of the file"); 922 uint64_t BigSize = cryptoff; 923 BigSize += cryptsize; 924 if (BigSize > FileSize) 925 return malformedError("cryptoff field plus cryptsize field of " + 926 Twine(CmdName) + " command " + 927 Twine(LoadCommandIndex) + " extends past the end of " 928 "the file"); 929 *LoadCmd = Load.Ptr; 930 return Error::success(); 931 } 932 933 static Error checkLinkerOptCommand(const MachOObjectFile &Obj, 934 const MachOObjectFile::LoadCommandInfo &Load, 935 uint32_t LoadCommandIndex) { 936 if (Load.C.cmdsize < sizeof(MachO::linker_option_command)) 937 return malformedError("load command " + Twine(LoadCommandIndex) + 938 " LC_LINKER_OPTION cmdsize too small"); 939 auto LinkOptionOrErr = 940 getStructOrErr<MachO::linker_option_command>(Obj, Load.Ptr); 941 if (!LinkOptionOrErr) 942 return LinkOptionOrErr.takeError(); 943 MachO::linker_option_command L = LinkOptionOrErr.get(); 944 // Make sure the count of strings is correct. 945 const char *string = (const char *)Load.Ptr + 946 sizeof(struct MachO::linker_option_command); 947 uint32_t left = L.cmdsize - sizeof(struct MachO::linker_option_command); 948 uint32_t i = 0; 949 while (left > 0) { 950 while (*string == '\0' && left > 0) { 951 string++; 952 left--; 953 } 954 if (left > 0) { 955 i++; 956 uint32_t NullPos = StringRef(string, left).find('\0'); 957 if (0xffffffff == NullPos) 958 return malformedError("load command " + Twine(LoadCommandIndex) + 959 " LC_LINKER_OPTION string #" + Twine(i) + 960 " is not NULL terminated"); 961 uint32_t len = std::min(NullPos, left) + 1; 962 string += len; 963 left -= len; 964 } 965 } 966 if (L.count != i) 967 return malformedError("load command " + Twine(LoadCommandIndex) + 968 " LC_LINKER_OPTION string count " + Twine(L.count) + 969 " does not match number of strings"); 970 return Error::success(); 971 } 972 973 static Error checkSubCommand(const MachOObjectFile &Obj, 974 const MachOObjectFile::LoadCommandInfo &Load, 975 uint32_t LoadCommandIndex, const char *CmdName, 976 size_t SizeOfCmd, const char *CmdStructName, 977 uint32_t PathOffset, const char *PathFieldName) { 978 if (PathOffset < SizeOfCmd) 979 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 980 CmdName + " " + PathFieldName + ".offset field too " 981 "small, not past the end of the " + CmdStructName); 982 if (PathOffset >= Load.C.cmdsize) 983 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 984 CmdName + " " + PathFieldName + ".offset field " 985 "extends past the end of the load command"); 986 // Make sure there is a null between the starting offset of the path and 987 // the end of the load command. 988 uint32_t i; 989 const char *P = (const char *)Load.Ptr; 990 for (i = PathOffset; i < Load.C.cmdsize; i++) 991 if (P[i] == '\0') 992 break; 993 if (i >= Load.C.cmdsize) 994 return malformedError("load command " + Twine(LoadCommandIndex) + " " + 995 CmdName + " " + PathFieldName + " name extends past " 996 "the end of the load command"); 997 return Error::success(); 998 } 999 1000 static Error checkThreadCommand(const MachOObjectFile &Obj, 1001 const MachOObjectFile::LoadCommandInfo &Load, 1002 uint32_t LoadCommandIndex, 1003 const char *CmdName) { 1004 if (Load.C.cmdsize < sizeof(MachO::thread_command)) 1005 return malformedError("load command " + Twine(LoadCommandIndex) + 1006 CmdName + " cmdsize too small"); 1007 auto ThreadCommandOrErr = 1008 getStructOrErr<MachO::thread_command>(Obj, Load.Ptr); 1009 if (!ThreadCommandOrErr) 1010 return ThreadCommandOrErr.takeError(); 1011 MachO::thread_command T = ThreadCommandOrErr.get(); 1012 const char *state = Load.Ptr + sizeof(MachO::thread_command); 1013 const char *end = Load.Ptr + T.cmdsize; 1014 uint32_t nflavor = 0; 1015 uint32_t cputype = getCPUType(Obj); 1016 while (state < end) { 1017 if(state + sizeof(uint32_t) > end) 1018 return malformedError("load command " + Twine(LoadCommandIndex) + 1019 "flavor in " + CmdName + " extends past end of " 1020 "command"); 1021 uint32_t flavor; 1022 memcpy(&flavor, state, sizeof(uint32_t)); 1023 if (Obj.isLittleEndian() != sys::IsLittleEndianHost) 1024 sys::swapByteOrder(flavor); 1025 state += sizeof(uint32_t); 1026 1027 if(state + sizeof(uint32_t) > end) 1028 return malformedError("load command " + Twine(LoadCommandIndex) + 1029 " count in " + CmdName + " extends past end of " 1030 "command"); 1031 uint32_t count; 1032 memcpy(&count, state, sizeof(uint32_t)); 1033 if (Obj.isLittleEndian() != sys::IsLittleEndianHost) 1034 sys::swapByteOrder(count); 1035 state += sizeof(uint32_t); 1036 1037 if (cputype == MachO::CPU_TYPE_I386) { 1038 if (flavor == MachO::x86_THREAD_STATE32) { 1039 if (count != MachO::x86_THREAD_STATE32_COUNT) 1040 return malformedError("load command " + Twine(LoadCommandIndex) + 1041 " count not x86_THREAD_STATE32_COUNT for " 1042 "flavor number " + Twine(nflavor) + " which is " 1043 "a x86_THREAD_STATE32 flavor in " + CmdName + 1044 " command"); 1045 if (state + sizeof(MachO::x86_thread_state32_t) > end) 1046 return malformedError("load command " + Twine(LoadCommandIndex) + 1047 " x86_THREAD_STATE32 extends past end of " 1048 "command in " + CmdName + " command"); 1049 state += sizeof(MachO::x86_thread_state32_t); 1050 } else { 1051 return malformedError("load command " + Twine(LoadCommandIndex) + 1052 " unknown flavor (" + Twine(flavor) + ") for " 1053 "flavor number " + Twine(nflavor) + " in " + 1054 CmdName + " command"); 1055 } 1056 } else if (cputype == MachO::CPU_TYPE_X86_64) { 1057 if (flavor == MachO::x86_THREAD_STATE) { 1058 if (count != MachO::x86_THREAD_STATE_COUNT) 1059 return malformedError("load command " + Twine(LoadCommandIndex) + 1060 " count not x86_THREAD_STATE_COUNT for " 1061 "flavor number " + Twine(nflavor) + " which is " 1062 "a x86_THREAD_STATE flavor in " + CmdName + 1063 " command"); 1064 if (state + sizeof(MachO::x86_thread_state_t) > end) 1065 return malformedError("load command " + Twine(LoadCommandIndex) + 1066 " x86_THREAD_STATE extends past end of " 1067 "command in " + CmdName + " command"); 1068 state += sizeof(MachO::x86_thread_state_t); 1069 } else if (flavor == MachO::x86_FLOAT_STATE) { 1070 if (count != MachO::x86_FLOAT_STATE_COUNT) 1071 return malformedError("load command " + Twine(LoadCommandIndex) + 1072 " count not x86_FLOAT_STATE_COUNT for " 1073 "flavor number " + Twine(nflavor) + " which is " 1074 "a x86_FLOAT_STATE flavor in " + CmdName + 1075 " command"); 1076 if (state + sizeof(MachO::x86_float_state_t) > end) 1077 return malformedError("load command " + Twine(LoadCommandIndex) + 1078 " x86_FLOAT_STATE extends past end of " 1079 "command in " + CmdName + " command"); 1080 state += sizeof(MachO::x86_float_state_t); 1081 } else if (flavor == MachO::x86_EXCEPTION_STATE) { 1082 if (count != MachO::x86_EXCEPTION_STATE_COUNT) 1083 return malformedError("load command " + Twine(LoadCommandIndex) + 1084 " count not x86_EXCEPTION_STATE_COUNT for " 1085 "flavor number " + Twine(nflavor) + " which is " 1086 "a x86_EXCEPTION_STATE flavor in " + CmdName + 1087 " command"); 1088 if (state + sizeof(MachO::x86_exception_state_t) > end) 1089 return malformedError("load command " + Twine(LoadCommandIndex) + 1090 " x86_EXCEPTION_STATE extends past end of " 1091 "command in " + CmdName + " command"); 1092 state += sizeof(MachO::x86_exception_state_t); 1093 } else if (flavor == MachO::x86_THREAD_STATE64) { 1094 if (count != MachO::x86_THREAD_STATE64_COUNT) 1095 return malformedError("load command " + Twine(LoadCommandIndex) + 1096 " count not x86_THREAD_STATE64_COUNT for " 1097 "flavor number " + Twine(nflavor) + " which is " 1098 "a x86_THREAD_STATE64 flavor in " + CmdName + 1099 " command"); 1100 if (state + sizeof(MachO::x86_thread_state64_t) > end) 1101 return malformedError("load command " + Twine(LoadCommandIndex) + 1102 " x86_THREAD_STATE64 extends past end of " 1103 "command in " + CmdName + " command"); 1104 state += sizeof(MachO::x86_thread_state64_t); 1105 } else if (flavor == MachO::x86_EXCEPTION_STATE64) { 1106 if (count != MachO::x86_EXCEPTION_STATE64_COUNT) 1107 return malformedError("load command " + Twine(LoadCommandIndex) + 1108 " count not x86_EXCEPTION_STATE64_COUNT for " 1109 "flavor number " + Twine(nflavor) + " which is " 1110 "a x86_EXCEPTION_STATE64 flavor in " + CmdName + 1111 " command"); 1112 if (state + sizeof(MachO::x86_exception_state64_t) > end) 1113 return malformedError("load command " + Twine(LoadCommandIndex) + 1114 " x86_EXCEPTION_STATE64 extends past end of " 1115 "command in " + CmdName + " command"); 1116 state += sizeof(MachO::x86_exception_state64_t); 1117 } else { 1118 return malformedError("load command " + Twine(LoadCommandIndex) + 1119 " unknown flavor (" + Twine(flavor) + ") for " 1120 "flavor number " + Twine(nflavor) + " in " + 1121 CmdName + " command"); 1122 } 1123 } else if (cputype == MachO::CPU_TYPE_ARM) { 1124 if (flavor == MachO::ARM_THREAD_STATE) { 1125 if (count != MachO::ARM_THREAD_STATE_COUNT) 1126 return malformedError("load command " + Twine(LoadCommandIndex) + 1127 " count not ARM_THREAD_STATE_COUNT for " 1128 "flavor number " + Twine(nflavor) + " which is " 1129 "a ARM_THREAD_STATE flavor in " + CmdName + 1130 " command"); 1131 if (state + sizeof(MachO::arm_thread_state32_t) > end) 1132 return malformedError("load command " + Twine(LoadCommandIndex) + 1133 " ARM_THREAD_STATE extends past end of " 1134 "command in " + CmdName + " command"); 1135 state += sizeof(MachO::arm_thread_state32_t); 1136 } else { 1137 return malformedError("load command " + Twine(LoadCommandIndex) + 1138 " unknown flavor (" + Twine(flavor) + ") for " 1139 "flavor number " + Twine(nflavor) + " in " + 1140 CmdName + " command"); 1141 } 1142 } else if (cputype == MachO::CPU_TYPE_ARM64 || 1143 cputype == MachO::CPU_TYPE_ARM64_32) { 1144 if (flavor == MachO::ARM_THREAD_STATE64) { 1145 if (count != MachO::ARM_THREAD_STATE64_COUNT) 1146 return malformedError("load command " + Twine(LoadCommandIndex) + 1147 " count not ARM_THREAD_STATE64_COUNT for " 1148 "flavor number " + Twine(nflavor) + " which is " 1149 "a ARM_THREAD_STATE64 flavor in " + CmdName + 1150 " command"); 1151 if (state + sizeof(MachO::arm_thread_state64_t) > end) 1152 return malformedError("load command " + Twine(LoadCommandIndex) + 1153 " ARM_THREAD_STATE64 extends past end of " 1154 "command in " + CmdName + " command"); 1155 state += sizeof(MachO::arm_thread_state64_t); 1156 } else { 1157 return malformedError("load command " + Twine(LoadCommandIndex) + 1158 " unknown flavor (" + Twine(flavor) + ") for " 1159 "flavor number " + Twine(nflavor) + " in " + 1160 CmdName + " command"); 1161 } 1162 } else if (cputype == MachO::CPU_TYPE_POWERPC) { 1163 if (flavor == MachO::PPC_THREAD_STATE) { 1164 if (count != MachO::PPC_THREAD_STATE_COUNT) 1165 return malformedError("load command " + Twine(LoadCommandIndex) + 1166 " count not PPC_THREAD_STATE_COUNT for " 1167 "flavor number " + Twine(nflavor) + " which is " 1168 "a PPC_THREAD_STATE flavor in " + CmdName + 1169 " command"); 1170 if (state + sizeof(MachO::ppc_thread_state32_t) > end) 1171 return malformedError("load command " + Twine(LoadCommandIndex) + 1172 " PPC_THREAD_STATE extends past end of " 1173 "command in " + CmdName + " command"); 1174 state += sizeof(MachO::ppc_thread_state32_t); 1175 } else { 1176 return malformedError("load command " + Twine(LoadCommandIndex) + 1177 " unknown flavor (" + Twine(flavor) + ") for " 1178 "flavor number " + Twine(nflavor) + " in " + 1179 CmdName + " command"); 1180 } 1181 } else { 1182 return malformedError("unknown cputype (" + Twine(cputype) + ") load " 1183 "command " + Twine(LoadCommandIndex) + " for " + 1184 CmdName + " command can't be checked"); 1185 } 1186 nflavor++; 1187 } 1188 return Error::success(); 1189 } 1190 1191 static Error checkTwoLevelHintsCommand(const MachOObjectFile &Obj, 1192 const MachOObjectFile::LoadCommandInfo 1193 &Load, 1194 uint32_t LoadCommandIndex, 1195 const char **LoadCmd, 1196 std::list<MachOElement> &Elements) { 1197 if (Load.C.cmdsize != sizeof(MachO::twolevel_hints_command)) 1198 return malformedError("load command " + Twine(LoadCommandIndex) + 1199 " LC_TWOLEVEL_HINTS has incorrect cmdsize"); 1200 if (*LoadCmd != nullptr) 1201 return malformedError("more than one LC_TWOLEVEL_HINTS command"); 1202 auto HintsOrErr = getStructOrErr<MachO::twolevel_hints_command>(Obj, Load.Ptr); 1203 if(!HintsOrErr) 1204 return HintsOrErr.takeError(); 1205 MachO::twolevel_hints_command Hints = HintsOrErr.get(); 1206 uint64_t FileSize = Obj.getData().size(); 1207 if (Hints.offset > FileSize) 1208 return malformedError("offset field of LC_TWOLEVEL_HINTS command " + 1209 Twine(LoadCommandIndex) + " extends past the end of " 1210 "the file"); 1211 uint64_t BigSize = Hints.nhints; 1212 BigSize *= sizeof(MachO::twolevel_hint); 1213 BigSize += Hints.offset; 1214 if (BigSize > FileSize) 1215 return malformedError("offset field plus nhints times sizeof(struct " 1216 "twolevel_hint) field of LC_TWOLEVEL_HINTS command " + 1217 Twine(LoadCommandIndex) + " extends past the end of " 1218 "the file"); 1219 if (Error Err = checkOverlappingElement(Elements, Hints.offset, Hints.nhints * 1220 sizeof(MachO::twolevel_hint), 1221 "two level hints")) 1222 return Err; 1223 *LoadCmd = Load.Ptr; 1224 return Error::success(); 1225 } 1226 1227 // Returns true if the libObject code does not support the load command and its 1228 // contents. The cmd value it is treated as an unknown load command but with 1229 // an error message that says the cmd value is obsolete. 1230 static bool isLoadCommandObsolete(uint32_t cmd) { 1231 if (cmd == MachO::LC_SYMSEG || 1232 cmd == MachO::LC_LOADFVMLIB || 1233 cmd == MachO::LC_IDFVMLIB || 1234 cmd == MachO::LC_IDENT || 1235 cmd == MachO::LC_FVMFILE || 1236 cmd == MachO::LC_PREPAGE || 1237 cmd == MachO::LC_PREBOUND_DYLIB || 1238 cmd == MachO::LC_TWOLEVEL_HINTS || 1239 cmd == MachO::LC_PREBIND_CKSUM) 1240 return true; 1241 return false; 1242 } 1243 1244 Expected<std::unique_ptr<MachOObjectFile>> 1245 MachOObjectFile::create(MemoryBufferRef Object, bool IsLittleEndian, 1246 bool Is64Bits, uint32_t UniversalCputype, 1247 uint32_t UniversalIndex) { 1248 Error Err = Error::success(); 1249 std::unique_ptr<MachOObjectFile> Obj( 1250 new MachOObjectFile(std::move(Object), IsLittleEndian, 1251 Is64Bits, Err, UniversalCputype, 1252 UniversalIndex)); 1253 if (Err) 1254 return std::move(Err); 1255 return std::move(Obj); 1256 } 1257 1258 MachOObjectFile::MachOObjectFile(MemoryBufferRef Object, bool IsLittleEndian, 1259 bool Is64bits, Error &Err, 1260 uint32_t UniversalCputype, 1261 uint32_t UniversalIndex) 1262 : ObjectFile(getMachOType(IsLittleEndian, Is64bits), Object) { 1263 ErrorAsOutParameter ErrAsOutParam(&Err); 1264 uint64_t SizeOfHeaders; 1265 uint32_t cputype; 1266 if (is64Bit()) { 1267 parseHeader(*this, Header64, Err); 1268 SizeOfHeaders = sizeof(MachO::mach_header_64); 1269 cputype = Header64.cputype; 1270 } else { 1271 parseHeader(*this, Header, Err); 1272 SizeOfHeaders = sizeof(MachO::mach_header); 1273 cputype = Header.cputype; 1274 } 1275 if (Err) 1276 return; 1277 SizeOfHeaders += getHeader().sizeofcmds; 1278 if (getData().data() + SizeOfHeaders > getData().end()) { 1279 Err = malformedError("load commands extend past the end of the file"); 1280 return; 1281 } 1282 if (UniversalCputype != 0 && cputype != UniversalCputype) { 1283 Err = malformedError("universal header architecture: " + 1284 Twine(UniversalIndex) + "'s cputype does not match " 1285 "object file's mach header"); 1286 return; 1287 } 1288 std::list<MachOElement> Elements; 1289 Elements.push_back({0, SizeOfHeaders, "Mach-O headers"}); 1290 1291 uint32_t LoadCommandCount = getHeader().ncmds; 1292 LoadCommandInfo Load; 1293 if (LoadCommandCount != 0) { 1294 if (auto LoadOrErr = getFirstLoadCommandInfo(*this)) 1295 Load = *LoadOrErr; 1296 else { 1297 Err = LoadOrErr.takeError(); 1298 return; 1299 } 1300 } 1301 1302 const char *DyldIdLoadCmd = nullptr; 1303 const char *FuncStartsLoadCmd = nullptr; 1304 const char *SplitInfoLoadCmd = nullptr; 1305 const char *CodeSignDrsLoadCmd = nullptr; 1306 const char *CodeSignLoadCmd = nullptr; 1307 const char *VersLoadCmd = nullptr; 1308 const char *SourceLoadCmd = nullptr; 1309 const char *EntryPointLoadCmd = nullptr; 1310 const char *EncryptLoadCmd = nullptr; 1311 const char *RoutinesLoadCmd = nullptr; 1312 const char *UnixThreadLoadCmd = nullptr; 1313 const char *TwoLevelHintsLoadCmd = nullptr; 1314 for (unsigned I = 0; I < LoadCommandCount; ++I) { 1315 if (is64Bit()) { 1316 if (Load.C.cmdsize % 8 != 0) { 1317 // We have a hack here to allow 64-bit Mach-O core files to have 1318 // LC_THREAD commands that are only a multiple of 4 and not 8 to be 1319 // allowed since the macOS kernel produces them. 1320 if (getHeader().filetype != MachO::MH_CORE || 1321 Load.C.cmd != MachO::LC_THREAD || Load.C.cmdsize % 4) { 1322 Err = malformedError("load command " + Twine(I) + " cmdsize not a " 1323 "multiple of 8"); 1324 return; 1325 } 1326 } 1327 } else { 1328 if (Load.C.cmdsize % 4 != 0) { 1329 Err = malformedError("load command " + Twine(I) + " cmdsize not a " 1330 "multiple of 4"); 1331 return; 1332 } 1333 } 1334 LoadCommands.push_back(Load); 1335 if (Load.C.cmd == MachO::LC_SYMTAB) { 1336 if ((Err = checkSymtabCommand(*this, Load, I, &SymtabLoadCmd, Elements))) 1337 return; 1338 } else if (Load.C.cmd == MachO::LC_DYSYMTAB) { 1339 if ((Err = checkDysymtabCommand(*this, Load, I, &DysymtabLoadCmd, 1340 Elements))) 1341 return; 1342 } else if (Load.C.cmd == MachO::LC_DATA_IN_CODE) { 1343 if ((Err = checkLinkeditDataCommand(*this, Load, I, &DataInCodeLoadCmd, 1344 "LC_DATA_IN_CODE", Elements, 1345 "data in code info"))) 1346 return; 1347 } else if (Load.C.cmd == MachO::LC_LINKER_OPTIMIZATION_HINT) { 1348 if ((Err = checkLinkeditDataCommand(*this, Load, I, &LinkOptHintsLoadCmd, 1349 "LC_LINKER_OPTIMIZATION_HINT", 1350 Elements, "linker optimization " 1351 "hints"))) 1352 return; 1353 } else if (Load.C.cmd == MachO::LC_FUNCTION_STARTS) { 1354 if ((Err = checkLinkeditDataCommand(*this, Load, I, &FuncStartsLoadCmd, 1355 "LC_FUNCTION_STARTS", Elements, 1356 "function starts data"))) 1357 return; 1358 } else if (Load.C.cmd == MachO::LC_SEGMENT_SPLIT_INFO) { 1359 if ((Err = checkLinkeditDataCommand(*this, Load, I, &SplitInfoLoadCmd, 1360 "LC_SEGMENT_SPLIT_INFO", Elements, 1361 "split info data"))) 1362 return; 1363 } else if (Load.C.cmd == MachO::LC_DYLIB_CODE_SIGN_DRS) { 1364 if ((Err = checkLinkeditDataCommand(*this, Load, I, &CodeSignDrsLoadCmd, 1365 "LC_DYLIB_CODE_SIGN_DRS", Elements, 1366 "code signing RDs data"))) 1367 return; 1368 } else if (Load.C.cmd == MachO::LC_CODE_SIGNATURE) { 1369 if ((Err = checkLinkeditDataCommand(*this, Load, I, &CodeSignLoadCmd, 1370 "LC_CODE_SIGNATURE", Elements, 1371 "code signature data"))) 1372 return; 1373 } else if (Load.C.cmd == MachO::LC_DYLD_INFO) { 1374 if ((Err = checkDyldInfoCommand(*this, Load, I, &DyldInfoLoadCmd, 1375 "LC_DYLD_INFO", Elements))) 1376 return; 1377 } else if (Load.C.cmd == MachO::LC_DYLD_INFO_ONLY) { 1378 if ((Err = checkDyldInfoCommand(*this, Load, I, &DyldInfoLoadCmd, 1379 "LC_DYLD_INFO_ONLY", Elements))) 1380 return; 1381 } else if (Load.C.cmd == MachO::LC_UUID) { 1382 if (Load.C.cmdsize != sizeof(MachO::uuid_command)) { 1383 Err = malformedError("LC_UUID command " + Twine(I) + " has incorrect " 1384 "cmdsize"); 1385 return; 1386 } 1387 if (UuidLoadCmd) { 1388 Err = malformedError("more than one LC_UUID command"); 1389 return; 1390 } 1391 UuidLoadCmd = Load.Ptr; 1392 } else if (Load.C.cmd == MachO::LC_SEGMENT_64) { 1393 if ((Err = parseSegmentLoadCommand<MachO::segment_command_64, 1394 MachO::section_64>( 1395 *this, Load, Sections, HasPageZeroSegment, I, 1396 "LC_SEGMENT_64", SizeOfHeaders, Elements))) 1397 return; 1398 } else if (Load.C.cmd == MachO::LC_SEGMENT) { 1399 if ((Err = parseSegmentLoadCommand<MachO::segment_command, 1400 MachO::section>( 1401 *this, Load, Sections, HasPageZeroSegment, I, 1402 "LC_SEGMENT", SizeOfHeaders, Elements))) 1403 return; 1404 } else if (Load.C.cmd == MachO::LC_ID_DYLIB) { 1405 if ((Err = checkDylibIdCommand(*this, Load, I, &DyldIdLoadCmd))) 1406 return; 1407 } else if (Load.C.cmd == MachO::LC_LOAD_DYLIB) { 1408 if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_DYLIB"))) 1409 return; 1410 Libraries.push_back(Load.Ptr); 1411 } else if (Load.C.cmd == MachO::LC_LOAD_WEAK_DYLIB) { 1412 if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_WEAK_DYLIB"))) 1413 return; 1414 Libraries.push_back(Load.Ptr); 1415 } else if (Load.C.cmd == MachO::LC_LAZY_LOAD_DYLIB) { 1416 if ((Err = checkDylibCommand(*this, Load, I, "LC_LAZY_LOAD_DYLIB"))) 1417 return; 1418 Libraries.push_back(Load.Ptr); 1419 } else if (Load.C.cmd == MachO::LC_REEXPORT_DYLIB) { 1420 if ((Err = checkDylibCommand(*this, Load, I, "LC_REEXPORT_DYLIB"))) 1421 return; 1422 Libraries.push_back(Load.Ptr); 1423 } else if (Load.C.cmd == MachO::LC_LOAD_UPWARD_DYLIB) { 1424 if ((Err = checkDylibCommand(*this, Load, I, "LC_LOAD_UPWARD_DYLIB"))) 1425 return; 1426 Libraries.push_back(Load.Ptr); 1427 } else if (Load.C.cmd == MachO::LC_ID_DYLINKER) { 1428 if ((Err = checkDyldCommand(*this, Load, I, "LC_ID_DYLINKER"))) 1429 return; 1430 } else if (Load.C.cmd == MachO::LC_LOAD_DYLINKER) { 1431 if ((Err = checkDyldCommand(*this, Load, I, "LC_LOAD_DYLINKER"))) 1432 return; 1433 } else if (Load.C.cmd == MachO::LC_DYLD_ENVIRONMENT) { 1434 if ((Err = checkDyldCommand(*this, Load, I, "LC_DYLD_ENVIRONMENT"))) 1435 return; 1436 } else if (Load.C.cmd == MachO::LC_VERSION_MIN_MACOSX) { 1437 if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd, 1438 "LC_VERSION_MIN_MACOSX"))) 1439 return; 1440 } else if (Load.C.cmd == MachO::LC_VERSION_MIN_IPHONEOS) { 1441 if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd, 1442 "LC_VERSION_MIN_IPHONEOS"))) 1443 return; 1444 } else if (Load.C.cmd == MachO::LC_VERSION_MIN_TVOS) { 1445 if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd, 1446 "LC_VERSION_MIN_TVOS"))) 1447 return; 1448 } else if (Load.C.cmd == MachO::LC_VERSION_MIN_WATCHOS) { 1449 if ((Err = checkVersCommand(*this, Load, I, &VersLoadCmd, 1450 "LC_VERSION_MIN_WATCHOS"))) 1451 return; 1452 } else if (Load.C.cmd == MachO::LC_NOTE) { 1453 if ((Err = checkNoteCommand(*this, Load, I, Elements))) 1454 return; 1455 } else if (Load.C.cmd == MachO::LC_BUILD_VERSION) { 1456 if ((Err = parseBuildVersionCommand(*this, Load, BuildTools, I))) 1457 return; 1458 } else if (Load.C.cmd == MachO::LC_RPATH) { 1459 if ((Err = checkRpathCommand(*this, Load, I))) 1460 return; 1461 } else if (Load.C.cmd == MachO::LC_SOURCE_VERSION) { 1462 if (Load.C.cmdsize != sizeof(MachO::source_version_command)) { 1463 Err = malformedError("LC_SOURCE_VERSION command " + Twine(I) + 1464 " has incorrect cmdsize"); 1465 return; 1466 } 1467 if (SourceLoadCmd) { 1468 Err = malformedError("more than one LC_SOURCE_VERSION command"); 1469 return; 1470 } 1471 SourceLoadCmd = Load.Ptr; 1472 } else if (Load.C.cmd == MachO::LC_MAIN) { 1473 if (Load.C.cmdsize != sizeof(MachO::entry_point_command)) { 1474 Err = malformedError("LC_MAIN command " + Twine(I) + 1475 " has incorrect cmdsize"); 1476 return; 1477 } 1478 if (EntryPointLoadCmd) { 1479 Err = malformedError("more than one LC_MAIN command"); 1480 return; 1481 } 1482 EntryPointLoadCmd = Load.Ptr; 1483 } else if (Load.C.cmd == MachO::LC_ENCRYPTION_INFO) { 1484 if (Load.C.cmdsize != sizeof(MachO::encryption_info_command)) { 1485 Err = malformedError("LC_ENCRYPTION_INFO command " + Twine(I) + 1486 " has incorrect cmdsize"); 1487 return; 1488 } 1489 MachO::encryption_info_command E = 1490 getStruct<MachO::encryption_info_command>(*this, Load.Ptr); 1491 if ((Err = checkEncryptCommand(*this, Load, I, E.cryptoff, E.cryptsize, 1492 &EncryptLoadCmd, "LC_ENCRYPTION_INFO"))) 1493 return; 1494 } else if (Load.C.cmd == MachO::LC_ENCRYPTION_INFO_64) { 1495 if (Load.C.cmdsize != sizeof(MachO::encryption_info_command_64)) { 1496 Err = malformedError("LC_ENCRYPTION_INFO_64 command " + Twine(I) + 1497 " has incorrect cmdsize"); 1498 return; 1499 } 1500 MachO::encryption_info_command_64 E = 1501 getStruct<MachO::encryption_info_command_64>(*this, Load.Ptr); 1502 if ((Err = checkEncryptCommand(*this, Load, I, E.cryptoff, E.cryptsize, 1503 &EncryptLoadCmd, "LC_ENCRYPTION_INFO_64"))) 1504 return; 1505 } else if (Load.C.cmd == MachO::LC_LINKER_OPTION) { 1506 if ((Err = checkLinkerOptCommand(*this, Load, I))) 1507 return; 1508 } else if (Load.C.cmd == MachO::LC_SUB_FRAMEWORK) { 1509 if (Load.C.cmdsize < sizeof(MachO::sub_framework_command)) { 1510 Err = malformedError("load command " + Twine(I) + 1511 " LC_SUB_FRAMEWORK cmdsize too small"); 1512 return; 1513 } 1514 MachO::sub_framework_command S = 1515 getStruct<MachO::sub_framework_command>(*this, Load.Ptr); 1516 if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_FRAMEWORK", 1517 sizeof(MachO::sub_framework_command), 1518 "sub_framework_command", S.umbrella, 1519 "umbrella"))) 1520 return; 1521 } else if (Load.C.cmd == MachO::LC_SUB_UMBRELLA) { 1522 if (Load.C.cmdsize < sizeof(MachO::sub_umbrella_command)) { 1523 Err = malformedError("load command " + Twine(I) + 1524 " LC_SUB_UMBRELLA cmdsize too small"); 1525 return; 1526 } 1527 MachO::sub_umbrella_command S = 1528 getStruct<MachO::sub_umbrella_command>(*this, Load.Ptr); 1529 if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_UMBRELLA", 1530 sizeof(MachO::sub_umbrella_command), 1531 "sub_umbrella_command", S.sub_umbrella, 1532 "sub_umbrella"))) 1533 return; 1534 } else if (Load.C.cmd == MachO::LC_SUB_LIBRARY) { 1535 if (Load.C.cmdsize < sizeof(MachO::sub_library_command)) { 1536 Err = malformedError("load command " + Twine(I) + 1537 " LC_SUB_LIBRARY cmdsize too small"); 1538 return; 1539 } 1540 MachO::sub_library_command S = 1541 getStruct<MachO::sub_library_command>(*this, Load.Ptr); 1542 if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_LIBRARY", 1543 sizeof(MachO::sub_library_command), 1544 "sub_library_command", S.sub_library, 1545 "sub_library"))) 1546 return; 1547 } else if (Load.C.cmd == MachO::LC_SUB_CLIENT) { 1548 if (Load.C.cmdsize < sizeof(MachO::sub_client_command)) { 1549 Err = malformedError("load command " + Twine(I) + 1550 " LC_SUB_CLIENT cmdsize too small"); 1551 return; 1552 } 1553 MachO::sub_client_command S = 1554 getStruct<MachO::sub_client_command>(*this, Load.Ptr); 1555 if ((Err = checkSubCommand(*this, Load, I, "LC_SUB_CLIENT", 1556 sizeof(MachO::sub_client_command), 1557 "sub_client_command", S.client, "client"))) 1558 return; 1559 } else if (Load.C.cmd == MachO::LC_ROUTINES) { 1560 if (Load.C.cmdsize != sizeof(MachO::routines_command)) { 1561 Err = malformedError("LC_ROUTINES command " + Twine(I) + 1562 " has incorrect cmdsize"); 1563 return; 1564 } 1565 if (RoutinesLoadCmd) { 1566 Err = malformedError("more than one LC_ROUTINES and or LC_ROUTINES_64 " 1567 "command"); 1568 return; 1569 } 1570 RoutinesLoadCmd = Load.Ptr; 1571 } else if (Load.C.cmd == MachO::LC_ROUTINES_64) { 1572 if (Load.C.cmdsize != sizeof(MachO::routines_command_64)) { 1573 Err = malformedError("LC_ROUTINES_64 command " + Twine(I) + 1574 " has incorrect cmdsize"); 1575 return; 1576 } 1577 if (RoutinesLoadCmd) { 1578 Err = malformedError("more than one LC_ROUTINES_64 and or LC_ROUTINES " 1579 "command"); 1580 return; 1581 } 1582 RoutinesLoadCmd = Load.Ptr; 1583 } else if (Load.C.cmd == MachO::LC_UNIXTHREAD) { 1584 if ((Err = checkThreadCommand(*this, Load, I, "LC_UNIXTHREAD"))) 1585 return; 1586 if (UnixThreadLoadCmd) { 1587 Err = malformedError("more than one LC_UNIXTHREAD command"); 1588 return; 1589 } 1590 UnixThreadLoadCmd = Load.Ptr; 1591 } else if (Load.C.cmd == MachO::LC_THREAD) { 1592 if ((Err = checkThreadCommand(*this, Load, I, "LC_THREAD"))) 1593 return; 1594 // Note: LC_TWOLEVEL_HINTS is really obsolete and is not supported. 1595 } else if (Load.C.cmd == MachO::LC_TWOLEVEL_HINTS) { 1596 if ((Err = checkTwoLevelHintsCommand(*this, Load, I, 1597 &TwoLevelHintsLoadCmd, Elements))) 1598 return; 1599 } else if (isLoadCommandObsolete(Load.C.cmd)) { 1600 Err = malformedError("load command " + Twine(I) + " for cmd value of: " + 1601 Twine(Load.C.cmd) + " is obsolete and not " 1602 "supported"); 1603 return; 1604 } 1605 // TODO: generate a error for unknown load commands by default. But still 1606 // need work out an approach to allow or not allow unknown values like this 1607 // as an option for some uses like lldb. 1608 if (I < LoadCommandCount - 1) { 1609 if (auto LoadOrErr = getNextLoadCommandInfo(*this, I, Load)) 1610 Load = *LoadOrErr; 1611 else { 1612 Err = LoadOrErr.takeError(); 1613 return; 1614 } 1615 } 1616 } 1617 if (!SymtabLoadCmd) { 1618 if (DysymtabLoadCmd) { 1619 Err = malformedError("contains LC_DYSYMTAB load command without a " 1620 "LC_SYMTAB load command"); 1621 return; 1622 } 1623 } else if (DysymtabLoadCmd) { 1624 MachO::symtab_command Symtab = 1625 getStruct<MachO::symtab_command>(*this, SymtabLoadCmd); 1626 MachO::dysymtab_command Dysymtab = 1627 getStruct<MachO::dysymtab_command>(*this, DysymtabLoadCmd); 1628 if (Dysymtab.nlocalsym != 0 && Dysymtab.ilocalsym > Symtab.nsyms) { 1629 Err = malformedError("ilocalsym in LC_DYSYMTAB load command " 1630 "extends past the end of the symbol table"); 1631 return; 1632 } 1633 uint64_t BigSize = Dysymtab.ilocalsym; 1634 BigSize += Dysymtab.nlocalsym; 1635 if (Dysymtab.nlocalsym != 0 && BigSize > Symtab.nsyms) { 1636 Err = malformedError("ilocalsym plus nlocalsym in LC_DYSYMTAB load " 1637 "command extends past the end of the symbol table"); 1638 return; 1639 } 1640 if (Dysymtab.nextdefsym != 0 && Dysymtab.iextdefsym > Symtab.nsyms) { 1641 Err = malformedError("iextdefsym in LC_DYSYMTAB load command " 1642 "extends past the end of the symbol table"); 1643 return; 1644 } 1645 BigSize = Dysymtab.iextdefsym; 1646 BigSize += Dysymtab.nextdefsym; 1647 if (Dysymtab.nextdefsym != 0 && BigSize > Symtab.nsyms) { 1648 Err = malformedError("iextdefsym plus nextdefsym in LC_DYSYMTAB " 1649 "load command extends past the end of the symbol " 1650 "table"); 1651 return; 1652 } 1653 if (Dysymtab.nundefsym != 0 && Dysymtab.iundefsym > Symtab.nsyms) { 1654 Err = malformedError("iundefsym in LC_DYSYMTAB load command " 1655 "extends past the end of the symbol table"); 1656 return; 1657 } 1658 BigSize = Dysymtab.iundefsym; 1659 BigSize += Dysymtab.nundefsym; 1660 if (Dysymtab.nundefsym != 0 && BigSize > Symtab.nsyms) { 1661 Err = malformedError("iundefsym plus nundefsym in LC_DYSYMTAB load " 1662 " command extends past the end of the symbol table"); 1663 return; 1664 } 1665 } 1666 if ((getHeader().filetype == MachO::MH_DYLIB || 1667 getHeader().filetype == MachO::MH_DYLIB_STUB) && 1668 DyldIdLoadCmd == nullptr) { 1669 Err = malformedError("no LC_ID_DYLIB load command in dynamic library " 1670 "filetype"); 1671 return; 1672 } 1673 assert(LoadCommands.size() == LoadCommandCount); 1674 1675 Err = Error::success(); 1676 } 1677 1678 Error MachOObjectFile::checkSymbolTable() const { 1679 uint32_t Flags = 0; 1680 if (is64Bit()) { 1681 MachO::mach_header_64 H_64 = MachOObjectFile::getHeader64(); 1682 Flags = H_64.flags; 1683 } else { 1684 MachO::mach_header H = MachOObjectFile::getHeader(); 1685 Flags = H.flags; 1686 } 1687 uint8_t NType = 0; 1688 uint8_t NSect = 0; 1689 uint16_t NDesc = 0; 1690 uint32_t NStrx = 0; 1691 uint64_t NValue = 0; 1692 uint32_t SymbolIndex = 0; 1693 MachO::symtab_command S = getSymtabLoadCommand(); 1694 for (const SymbolRef &Symbol : symbols()) { 1695 DataRefImpl SymDRI = Symbol.getRawDataRefImpl(); 1696 if (is64Bit()) { 1697 MachO::nlist_64 STE_64 = getSymbol64TableEntry(SymDRI); 1698 NType = STE_64.n_type; 1699 NSect = STE_64.n_sect; 1700 NDesc = STE_64.n_desc; 1701 NStrx = STE_64.n_strx; 1702 NValue = STE_64.n_value; 1703 } else { 1704 MachO::nlist STE = getSymbolTableEntry(SymDRI); 1705 NType = STE.n_type; 1706 NSect = STE.n_sect; 1707 NDesc = STE.n_desc; 1708 NStrx = STE.n_strx; 1709 NValue = STE.n_value; 1710 } 1711 if ((NType & MachO::N_STAB) == 0) { 1712 if ((NType & MachO::N_TYPE) == MachO::N_SECT) { 1713 if (NSect == 0 || NSect > Sections.size()) 1714 return malformedError("bad section index: " + Twine((int)NSect) + 1715 " for symbol at index " + Twine(SymbolIndex)); 1716 } 1717 if ((NType & MachO::N_TYPE) == MachO::N_INDR) { 1718 if (NValue >= S.strsize) 1719 return malformedError("bad n_value: " + Twine((int)NValue) + " past " 1720 "the end of string table, for N_INDR symbol at " 1721 "index " + Twine(SymbolIndex)); 1722 } 1723 if ((Flags & MachO::MH_TWOLEVEL) == MachO::MH_TWOLEVEL && 1724 (((NType & MachO::N_TYPE) == MachO::N_UNDF && NValue == 0) || 1725 (NType & MachO::N_TYPE) == MachO::N_PBUD)) { 1726 uint32_t LibraryOrdinal = MachO::GET_LIBRARY_ORDINAL(NDesc); 1727 if (LibraryOrdinal != 0 && 1728 LibraryOrdinal != MachO::EXECUTABLE_ORDINAL && 1729 LibraryOrdinal != MachO::DYNAMIC_LOOKUP_ORDINAL && 1730 LibraryOrdinal - 1 >= Libraries.size() ) { 1731 return malformedError("bad library ordinal: " + Twine(LibraryOrdinal) + 1732 " for symbol at index " + Twine(SymbolIndex)); 1733 } 1734 } 1735 } 1736 if (NStrx >= S.strsize) 1737 return malformedError("bad string table index: " + Twine((int)NStrx) + 1738 " past the end of string table, for symbol at " 1739 "index " + Twine(SymbolIndex)); 1740 SymbolIndex++; 1741 } 1742 return Error::success(); 1743 } 1744 1745 void MachOObjectFile::moveSymbolNext(DataRefImpl &Symb) const { 1746 unsigned SymbolTableEntrySize = is64Bit() ? 1747 sizeof(MachO::nlist_64) : 1748 sizeof(MachO::nlist); 1749 Symb.p += SymbolTableEntrySize; 1750 } 1751 1752 Expected<StringRef> MachOObjectFile::getSymbolName(DataRefImpl Symb) const { 1753 StringRef StringTable = getStringTableData(); 1754 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb); 1755 if (Entry.n_strx == 0) 1756 // A n_strx value of 0 indicates that no name is associated with a 1757 // particular symbol table entry. 1758 return StringRef(); 1759 const char *Start = &StringTable.data()[Entry.n_strx]; 1760 if (Start < getData().begin() || Start >= getData().end()) { 1761 return malformedError("bad string index: " + Twine(Entry.n_strx) + 1762 " for symbol at index " + Twine(getSymbolIndex(Symb))); 1763 } 1764 return StringRef(Start); 1765 } 1766 1767 unsigned MachOObjectFile::getSectionType(SectionRef Sec) const { 1768 DataRefImpl DRI = Sec.getRawDataRefImpl(); 1769 uint32_t Flags = getSectionFlags(*this, DRI); 1770 return Flags & MachO::SECTION_TYPE; 1771 } 1772 1773 uint64_t MachOObjectFile::getNValue(DataRefImpl Sym) const { 1774 if (is64Bit()) { 1775 MachO::nlist_64 Entry = getSymbol64TableEntry(Sym); 1776 return Entry.n_value; 1777 } 1778 MachO::nlist Entry = getSymbolTableEntry(Sym); 1779 return Entry.n_value; 1780 } 1781 1782 // getIndirectName() returns the name of the alias'ed symbol who's string table 1783 // index is in the n_value field. 1784 std::error_code MachOObjectFile::getIndirectName(DataRefImpl Symb, 1785 StringRef &Res) const { 1786 StringRef StringTable = getStringTableData(); 1787 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb); 1788 if ((Entry.n_type & MachO::N_TYPE) != MachO::N_INDR) 1789 return object_error::parse_failed; 1790 uint64_t NValue = getNValue(Symb); 1791 if (NValue >= StringTable.size()) 1792 return object_error::parse_failed; 1793 const char *Start = &StringTable.data()[NValue]; 1794 Res = StringRef(Start); 1795 return std::error_code(); 1796 } 1797 1798 uint64_t MachOObjectFile::getSymbolValueImpl(DataRefImpl Sym) const { 1799 return getNValue(Sym); 1800 } 1801 1802 Expected<uint64_t> MachOObjectFile::getSymbolAddress(DataRefImpl Sym) const { 1803 return getSymbolValue(Sym); 1804 } 1805 1806 uint32_t MachOObjectFile::getSymbolAlignment(DataRefImpl DRI) const { 1807 uint32_t Flags = cantFail(getSymbolFlags(DRI)); 1808 if (Flags & SymbolRef::SF_Common) { 1809 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, DRI); 1810 return 1 << MachO::GET_COMM_ALIGN(Entry.n_desc); 1811 } 1812 return 0; 1813 } 1814 1815 uint64_t MachOObjectFile::getCommonSymbolSizeImpl(DataRefImpl DRI) const { 1816 return getNValue(DRI); 1817 } 1818 1819 Expected<SymbolRef::Type> 1820 MachOObjectFile::getSymbolType(DataRefImpl Symb) const { 1821 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb); 1822 uint8_t n_type = Entry.n_type; 1823 1824 // If this is a STAB debugging symbol, we can do nothing more. 1825 if (n_type & MachO::N_STAB) 1826 return SymbolRef::ST_Debug; 1827 1828 switch (n_type & MachO::N_TYPE) { 1829 case MachO::N_UNDF : 1830 return SymbolRef::ST_Unknown; 1831 case MachO::N_SECT : 1832 Expected<section_iterator> SecOrError = getSymbolSection(Symb); 1833 if (!SecOrError) 1834 return SecOrError.takeError(); 1835 section_iterator Sec = *SecOrError; 1836 if (Sec->isData() || Sec->isBSS()) 1837 return SymbolRef::ST_Data; 1838 return SymbolRef::ST_Function; 1839 } 1840 return SymbolRef::ST_Other; 1841 } 1842 1843 Expected<uint32_t> MachOObjectFile::getSymbolFlags(DataRefImpl DRI) const { 1844 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, DRI); 1845 1846 uint8_t MachOType = Entry.n_type; 1847 uint16_t MachOFlags = Entry.n_desc; 1848 1849 uint32_t Result = SymbolRef::SF_None; 1850 1851 if ((MachOType & MachO::N_TYPE) == MachO::N_INDR) 1852 Result |= SymbolRef::SF_Indirect; 1853 1854 if (MachOType & MachO::N_STAB) 1855 Result |= SymbolRef::SF_FormatSpecific; 1856 1857 if (MachOType & MachO::N_EXT) { 1858 Result |= SymbolRef::SF_Global; 1859 if ((MachOType & MachO::N_TYPE) == MachO::N_UNDF) { 1860 if (getNValue(DRI)) 1861 Result |= SymbolRef::SF_Common; 1862 else 1863 Result |= SymbolRef::SF_Undefined; 1864 } 1865 1866 if (!(MachOType & MachO::N_PEXT)) 1867 Result |= SymbolRef::SF_Exported; 1868 } 1869 1870 if (MachOFlags & (MachO::N_WEAK_REF | MachO::N_WEAK_DEF)) 1871 Result |= SymbolRef::SF_Weak; 1872 1873 if (MachOFlags & (MachO::N_ARM_THUMB_DEF)) 1874 Result |= SymbolRef::SF_Thumb; 1875 1876 if ((MachOType & MachO::N_TYPE) == MachO::N_ABS) 1877 Result |= SymbolRef::SF_Absolute; 1878 1879 return Result; 1880 } 1881 1882 Expected<section_iterator> 1883 MachOObjectFile::getSymbolSection(DataRefImpl Symb) const { 1884 MachO::nlist_base Entry = getSymbolTableEntryBase(*this, Symb); 1885 uint8_t index = Entry.n_sect; 1886 1887 if (index == 0) 1888 return section_end(); 1889 DataRefImpl DRI; 1890 DRI.d.a = index - 1; 1891 if (DRI.d.a >= Sections.size()){ 1892 return malformedError("bad section index: " + Twine((int)index) + 1893 " for symbol at index " + Twine(getSymbolIndex(Symb))); 1894 } 1895 return section_iterator(SectionRef(DRI, this)); 1896 } 1897 1898 unsigned MachOObjectFile::getSymbolSectionID(SymbolRef Sym) const { 1899 MachO::nlist_base Entry = 1900 getSymbolTableEntryBase(*this, Sym.getRawDataRefImpl()); 1901 return Entry.n_sect - 1; 1902 } 1903 1904 void MachOObjectFile::moveSectionNext(DataRefImpl &Sec) const { 1905 Sec.d.a++; 1906 } 1907 1908 Expected<StringRef> MachOObjectFile::getSectionName(DataRefImpl Sec) const { 1909 ArrayRef<char> Raw = getSectionRawName(Sec); 1910 return parseSegmentOrSectionName(Raw.data()); 1911 } 1912 1913 uint64_t MachOObjectFile::getSectionAddress(DataRefImpl Sec) const { 1914 if (is64Bit()) 1915 return getSection64(Sec).addr; 1916 return getSection(Sec).addr; 1917 } 1918 1919 uint64_t MachOObjectFile::getSectionIndex(DataRefImpl Sec) const { 1920 return Sec.d.a; 1921 } 1922 1923 uint64_t MachOObjectFile::getSectionSize(DataRefImpl Sec) const { 1924 // In the case if a malformed Mach-O file where the section offset is past 1925 // the end of the file or some part of the section size is past the end of 1926 // the file return a size of zero or a size that covers the rest of the file 1927 // but does not extend past the end of the file. 1928 uint32_t SectOffset, SectType; 1929 uint64_t SectSize; 1930 1931 if (is64Bit()) { 1932 MachO::section_64 Sect = getSection64(Sec); 1933 SectOffset = Sect.offset; 1934 SectSize = Sect.size; 1935 SectType = Sect.flags & MachO::SECTION_TYPE; 1936 } else { 1937 MachO::section Sect = getSection(Sec); 1938 SectOffset = Sect.offset; 1939 SectSize = Sect.size; 1940 SectType = Sect.flags & MachO::SECTION_TYPE; 1941 } 1942 if (SectType == MachO::S_ZEROFILL || SectType == MachO::S_GB_ZEROFILL) 1943 return SectSize; 1944 uint64_t FileSize = getData().size(); 1945 if (SectOffset > FileSize) 1946 return 0; 1947 if (FileSize - SectOffset < SectSize) 1948 return FileSize - SectOffset; 1949 return SectSize; 1950 } 1951 1952 ArrayRef<uint8_t> MachOObjectFile::getSectionContents(uint32_t Offset, 1953 uint64_t Size) const { 1954 return arrayRefFromStringRef(getData().substr(Offset, Size)); 1955 } 1956 1957 Expected<ArrayRef<uint8_t>> 1958 MachOObjectFile::getSectionContents(DataRefImpl Sec) const { 1959 uint32_t Offset; 1960 uint64_t Size; 1961 1962 if (is64Bit()) { 1963 MachO::section_64 Sect = getSection64(Sec); 1964 Offset = Sect.offset; 1965 Size = Sect.size; 1966 } else { 1967 MachO::section Sect = getSection(Sec); 1968 Offset = Sect.offset; 1969 Size = Sect.size; 1970 } 1971 1972 return getSectionContents(Offset, Size); 1973 } 1974 1975 uint64_t MachOObjectFile::getSectionAlignment(DataRefImpl Sec) const { 1976 uint32_t Align; 1977 if (is64Bit()) { 1978 MachO::section_64 Sect = getSection64(Sec); 1979 Align = Sect.align; 1980 } else { 1981 MachO::section Sect = getSection(Sec); 1982 Align = Sect.align; 1983 } 1984 1985 return uint64_t(1) << Align; 1986 } 1987 1988 Expected<SectionRef> MachOObjectFile::getSection(unsigned SectionIndex) const { 1989 if (SectionIndex < 1 || SectionIndex > Sections.size()) 1990 return malformedError("bad section index: " + Twine((int)SectionIndex)); 1991 1992 DataRefImpl DRI; 1993 DRI.d.a = SectionIndex - 1; 1994 return SectionRef(DRI, this); 1995 } 1996 1997 Expected<SectionRef> MachOObjectFile::getSection(StringRef SectionName) const { 1998 for (const SectionRef &Section : sections()) { 1999 auto NameOrErr = Section.getName(); 2000 if (!NameOrErr) 2001 return NameOrErr.takeError(); 2002 if (*NameOrErr == SectionName) 2003 return Section; 2004 } 2005 return errorCodeToError(object_error::parse_failed); 2006 } 2007 2008 bool MachOObjectFile::isSectionCompressed(DataRefImpl Sec) const { 2009 return false; 2010 } 2011 2012 bool MachOObjectFile::isSectionText(DataRefImpl Sec) const { 2013 uint32_t Flags = getSectionFlags(*this, Sec); 2014 return Flags & MachO::S_ATTR_PURE_INSTRUCTIONS; 2015 } 2016 2017 bool MachOObjectFile::isSectionData(DataRefImpl Sec) const { 2018 uint32_t Flags = getSectionFlags(*this, Sec); 2019 unsigned SectionType = Flags & MachO::SECTION_TYPE; 2020 return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) && 2021 !(SectionType == MachO::S_ZEROFILL || 2022 SectionType == MachO::S_GB_ZEROFILL); 2023 } 2024 2025 bool MachOObjectFile::isSectionBSS(DataRefImpl Sec) const { 2026 uint32_t Flags = getSectionFlags(*this, Sec); 2027 unsigned SectionType = Flags & MachO::SECTION_TYPE; 2028 return !(Flags & MachO::S_ATTR_PURE_INSTRUCTIONS) && 2029 (SectionType == MachO::S_ZEROFILL || 2030 SectionType == MachO::S_GB_ZEROFILL); 2031 } 2032 2033 bool MachOObjectFile::isDebugSection(StringRef SectionName) const { 2034 return SectionName.startswith("__debug") || 2035 SectionName.startswith("__zdebug") || 2036 SectionName.startswith("__apple") || SectionName == "__gdb_index"; 2037 } 2038 2039 unsigned MachOObjectFile::getSectionID(SectionRef Sec) const { 2040 return Sec.getRawDataRefImpl().d.a; 2041 } 2042 2043 bool MachOObjectFile::isSectionVirtual(DataRefImpl Sec) const { 2044 uint32_t Flags = getSectionFlags(*this, Sec); 2045 unsigned SectionType = Flags & MachO::SECTION_TYPE; 2046 return SectionType == MachO::S_ZEROFILL || 2047 SectionType == MachO::S_GB_ZEROFILL; 2048 } 2049 2050 bool MachOObjectFile::isSectionBitcode(DataRefImpl Sec) const { 2051 StringRef SegmentName = getSectionFinalSegmentName(Sec); 2052 if (Expected<StringRef> NameOrErr = getSectionName(Sec)) 2053 return (SegmentName == "__LLVM" && *NameOrErr == "__bitcode"); 2054 return false; 2055 } 2056 2057 bool MachOObjectFile::isSectionStripped(DataRefImpl Sec) const { 2058 if (is64Bit()) 2059 return getSection64(Sec).offset == 0; 2060 return getSection(Sec).offset == 0; 2061 } 2062 2063 relocation_iterator MachOObjectFile::section_rel_begin(DataRefImpl Sec) const { 2064 DataRefImpl Ret; 2065 Ret.d.a = Sec.d.a; 2066 Ret.d.b = 0; 2067 return relocation_iterator(RelocationRef(Ret, this)); 2068 } 2069 2070 relocation_iterator 2071 MachOObjectFile::section_rel_end(DataRefImpl Sec) const { 2072 uint32_t Num; 2073 if (is64Bit()) { 2074 MachO::section_64 Sect = getSection64(Sec); 2075 Num = Sect.nreloc; 2076 } else { 2077 MachO::section Sect = getSection(Sec); 2078 Num = Sect.nreloc; 2079 } 2080 2081 DataRefImpl Ret; 2082 Ret.d.a = Sec.d.a; 2083 Ret.d.b = Num; 2084 return relocation_iterator(RelocationRef(Ret, this)); 2085 } 2086 2087 relocation_iterator MachOObjectFile::extrel_begin() const { 2088 DataRefImpl Ret; 2089 // for DYSYMTAB symbols, Ret.d.a == 0 for external relocations 2090 Ret.d.a = 0; // Would normally be a section index. 2091 Ret.d.b = 0; // Index into the external relocations 2092 return relocation_iterator(RelocationRef(Ret, this)); 2093 } 2094 2095 relocation_iterator MachOObjectFile::extrel_end() const { 2096 MachO::dysymtab_command DysymtabLoadCmd = getDysymtabLoadCommand(); 2097 DataRefImpl Ret; 2098 // for DYSYMTAB symbols, Ret.d.a == 0 for external relocations 2099 Ret.d.a = 0; // Would normally be a section index. 2100 Ret.d.b = DysymtabLoadCmd.nextrel; // Index into the external relocations 2101 return relocation_iterator(RelocationRef(Ret, this)); 2102 } 2103 2104 relocation_iterator MachOObjectFile::locrel_begin() const { 2105 DataRefImpl Ret; 2106 // for DYSYMTAB symbols, Ret.d.a == 1 for local relocations 2107 Ret.d.a = 1; // Would normally be a section index. 2108 Ret.d.b = 0; // Index into the local relocations 2109 return relocation_iterator(RelocationRef(Ret, this)); 2110 } 2111 2112 relocation_iterator MachOObjectFile::locrel_end() const { 2113 MachO::dysymtab_command DysymtabLoadCmd = getDysymtabLoadCommand(); 2114 DataRefImpl Ret; 2115 // for DYSYMTAB symbols, Ret.d.a == 1 for local relocations 2116 Ret.d.a = 1; // Would normally be a section index. 2117 Ret.d.b = DysymtabLoadCmd.nlocrel; // Index into the local relocations 2118 return relocation_iterator(RelocationRef(Ret, this)); 2119 } 2120 2121 void MachOObjectFile::moveRelocationNext(DataRefImpl &Rel) const { 2122 ++Rel.d.b; 2123 } 2124 2125 uint64_t MachOObjectFile::getRelocationOffset(DataRefImpl Rel) const { 2126 assert((getHeader().filetype == MachO::MH_OBJECT || 2127 getHeader().filetype == MachO::MH_KEXT_BUNDLE) && 2128 "Only implemented for MH_OBJECT && MH_KEXT_BUNDLE"); 2129 MachO::any_relocation_info RE = getRelocation(Rel); 2130 return getAnyRelocationAddress(RE); 2131 } 2132 2133 symbol_iterator 2134 MachOObjectFile::getRelocationSymbol(DataRefImpl Rel) const { 2135 MachO::any_relocation_info RE = getRelocation(Rel); 2136 if (isRelocationScattered(RE)) 2137 return symbol_end(); 2138 2139 uint32_t SymbolIdx = getPlainRelocationSymbolNum(RE); 2140 bool isExtern = getPlainRelocationExternal(RE); 2141 if (!isExtern) 2142 return symbol_end(); 2143 2144 MachO::symtab_command S = getSymtabLoadCommand(); 2145 unsigned SymbolTableEntrySize = is64Bit() ? 2146 sizeof(MachO::nlist_64) : 2147 sizeof(MachO::nlist); 2148 uint64_t Offset = S.symoff + SymbolIdx * SymbolTableEntrySize; 2149 DataRefImpl Sym; 2150 Sym.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset)); 2151 return symbol_iterator(SymbolRef(Sym, this)); 2152 } 2153 2154 section_iterator 2155 MachOObjectFile::getRelocationSection(DataRefImpl Rel) const { 2156 return section_iterator(getAnyRelocationSection(getRelocation(Rel))); 2157 } 2158 2159 uint64_t MachOObjectFile::getRelocationType(DataRefImpl Rel) const { 2160 MachO::any_relocation_info RE = getRelocation(Rel); 2161 return getAnyRelocationType(RE); 2162 } 2163 2164 void MachOObjectFile::getRelocationTypeName( 2165 DataRefImpl Rel, SmallVectorImpl<char> &Result) const { 2166 StringRef res; 2167 uint64_t RType = getRelocationType(Rel); 2168 2169 unsigned Arch = this->getArch(); 2170 2171 switch (Arch) { 2172 case Triple::x86: { 2173 static const char *const Table[] = { 2174 "GENERIC_RELOC_VANILLA", 2175 "GENERIC_RELOC_PAIR", 2176 "GENERIC_RELOC_SECTDIFF", 2177 "GENERIC_RELOC_PB_LA_PTR", 2178 "GENERIC_RELOC_LOCAL_SECTDIFF", 2179 "GENERIC_RELOC_TLV" }; 2180 2181 if (RType > 5) 2182 res = "Unknown"; 2183 else 2184 res = Table[RType]; 2185 break; 2186 } 2187 case Triple::x86_64: { 2188 static const char *const Table[] = { 2189 "X86_64_RELOC_UNSIGNED", 2190 "X86_64_RELOC_SIGNED", 2191 "X86_64_RELOC_BRANCH", 2192 "X86_64_RELOC_GOT_LOAD", 2193 "X86_64_RELOC_GOT", 2194 "X86_64_RELOC_SUBTRACTOR", 2195 "X86_64_RELOC_SIGNED_1", 2196 "X86_64_RELOC_SIGNED_2", 2197 "X86_64_RELOC_SIGNED_4", 2198 "X86_64_RELOC_TLV" }; 2199 2200 if (RType > 9) 2201 res = "Unknown"; 2202 else 2203 res = Table[RType]; 2204 break; 2205 } 2206 case Triple::arm: { 2207 static const char *const Table[] = { 2208 "ARM_RELOC_VANILLA", 2209 "ARM_RELOC_PAIR", 2210 "ARM_RELOC_SECTDIFF", 2211 "ARM_RELOC_LOCAL_SECTDIFF", 2212 "ARM_RELOC_PB_LA_PTR", 2213 "ARM_RELOC_BR24", 2214 "ARM_THUMB_RELOC_BR22", 2215 "ARM_THUMB_32BIT_BRANCH", 2216 "ARM_RELOC_HALF", 2217 "ARM_RELOC_HALF_SECTDIFF" }; 2218 2219 if (RType > 9) 2220 res = "Unknown"; 2221 else 2222 res = Table[RType]; 2223 break; 2224 } 2225 case Triple::aarch64: 2226 case Triple::aarch64_32: { 2227 static const char *const Table[] = { 2228 "ARM64_RELOC_UNSIGNED", "ARM64_RELOC_SUBTRACTOR", 2229 "ARM64_RELOC_BRANCH26", "ARM64_RELOC_PAGE21", 2230 "ARM64_RELOC_PAGEOFF12", "ARM64_RELOC_GOT_LOAD_PAGE21", 2231 "ARM64_RELOC_GOT_LOAD_PAGEOFF12", "ARM64_RELOC_POINTER_TO_GOT", 2232 "ARM64_RELOC_TLVP_LOAD_PAGE21", "ARM64_RELOC_TLVP_LOAD_PAGEOFF12", 2233 "ARM64_RELOC_ADDEND" 2234 }; 2235 2236 if (RType >= array_lengthof(Table)) 2237 res = "Unknown"; 2238 else 2239 res = Table[RType]; 2240 break; 2241 } 2242 case Triple::ppc: { 2243 static const char *const Table[] = { 2244 "PPC_RELOC_VANILLA", 2245 "PPC_RELOC_PAIR", 2246 "PPC_RELOC_BR14", 2247 "PPC_RELOC_BR24", 2248 "PPC_RELOC_HI16", 2249 "PPC_RELOC_LO16", 2250 "PPC_RELOC_HA16", 2251 "PPC_RELOC_LO14", 2252 "PPC_RELOC_SECTDIFF", 2253 "PPC_RELOC_PB_LA_PTR", 2254 "PPC_RELOC_HI16_SECTDIFF", 2255 "PPC_RELOC_LO16_SECTDIFF", 2256 "PPC_RELOC_HA16_SECTDIFF", 2257 "PPC_RELOC_JBSR", 2258 "PPC_RELOC_LO14_SECTDIFF", 2259 "PPC_RELOC_LOCAL_SECTDIFF" }; 2260 2261 if (RType > 15) 2262 res = "Unknown"; 2263 else 2264 res = Table[RType]; 2265 break; 2266 } 2267 case Triple::UnknownArch: 2268 res = "Unknown"; 2269 break; 2270 } 2271 Result.append(res.begin(), res.end()); 2272 } 2273 2274 uint8_t MachOObjectFile::getRelocationLength(DataRefImpl Rel) const { 2275 MachO::any_relocation_info RE = getRelocation(Rel); 2276 return getAnyRelocationLength(RE); 2277 } 2278 2279 // 2280 // guessLibraryShortName() is passed a name of a dynamic library and returns a 2281 // guess on what the short name is. Then name is returned as a substring of the 2282 // StringRef Name passed in. The name of the dynamic library is recognized as 2283 // a framework if it has one of the two following forms: 2284 // Foo.framework/Versions/A/Foo 2285 // Foo.framework/Foo 2286 // Where A and Foo can be any string. And may contain a trailing suffix 2287 // starting with an underbar. If the Name is recognized as a framework then 2288 // isFramework is set to true else it is set to false. If the Name has a 2289 // suffix then Suffix is set to the substring in Name that contains the suffix 2290 // else it is set to a NULL StringRef. 2291 // 2292 // The Name of the dynamic library is recognized as a library name if it has 2293 // one of the two following forms: 2294 // libFoo.A.dylib 2295 // libFoo.dylib 2296 // 2297 // The library may have a suffix trailing the name Foo of the form: 2298 // libFoo_profile.A.dylib 2299 // libFoo_profile.dylib 2300 // These dyld image suffixes are separated from the short name by a '_' 2301 // character. Because the '_' character is commonly used to separate words in 2302 // filenames guessLibraryShortName() cannot reliably separate a dylib's short 2303 // name from an arbitrary image suffix; imagine if both the short name and the 2304 // suffix contains an '_' character! To better deal with this ambiguity, 2305 // guessLibraryShortName() will recognize only "_debug" and "_profile" as valid 2306 // Suffix values. Calling code needs to be tolerant of guessLibraryShortName() 2307 // guessing incorrectly. 2308 // 2309 // The Name of the dynamic library is also recognized as a library name if it 2310 // has the following form: 2311 // Foo.qtx 2312 // 2313 // If the Name of the dynamic library is none of the forms above then a NULL 2314 // StringRef is returned. 2315 StringRef MachOObjectFile::guessLibraryShortName(StringRef Name, 2316 bool &isFramework, 2317 StringRef &Suffix) { 2318 StringRef Foo, F, DotFramework, V, Dylib, Lib, Dot, Qtx; 2319 size_t a, b, c, d, Idx; 2320 2321 isFramework = false; 2322 Suffix = StringRef(); 2323 2324 // Pull off the last component and make Foo point to it 2325 a = Name.rfind('/'); 2326 if (a == Name.npos || a == 0) 2327 goto guess_library; 2328 Foo = Name.slice(a+1, Name.npos); 2329 2330 // Look for a suffix starting with a '_' 2331 Idx = Foo.rfind('_'); 2332 if (Idx != Foo.npos && Foo.size() >= 2) { 2333 Suffix = Foo.slice(Idx, Foo.npos); 2334 if (Suffix != "_debug" && Suffix != "_profile") 2335 Suffix = StringRef(); 2336 else 2337 Foo = Foo.slice(0, Idx); 2338 } 2339 2340 // First look for the form Foo.framework/Foo 2341 b = Name.rfind('/', a); 2342 if (b == Name.npos) 2343 Idx = 0; 2344 else 2345 Idx = b+1; 2346 F = Name.slice(Idx, Idx + Foo.size()); 2347 DotFramework = Name.slice(Idx + Foo.size(), 2348 Idx + Foo.size() + sizeof(".framework/")-1); 2349 if (F == Foo && DotFramework == ".framework/") { 2350 isFramework = true; 2351 return Foo; 2352 } 2353 2354 // Next look for the form Foo.framework/Versions/A/Foo 2355 if (b == Name.npos) 2356 goto guess_library; 2357 c = Name.rfind('/', b); 2358 if (c == Name.npos || c == 0) 2359 goto guess_library; 2360 V = Name.slice(c+1, Name.npos); 2361 if (!V.startswith("Versions/")) 2362 goto guess_library; 2363 d = Name.rfind('/', c); 2364 if (d == Name.npos) 2365 Idx = 0; 2366 else 2367 Idx = d+1; 2368 F = Name.slice(Idx, Idx + Foo.size()); 2369 DotFramework = Name.slice(Idx + Foo.size(), 2370 Idx + Foo.size() + sizeof(".framework/")-1); 2371 if (F == Foo && DotFramework == ".framework/") { 2372 isFramework = true; 2373 return Foo; 2374 } 2375 2376 guess_library: 2377 // pull off the suffix after the "." and make a point to it 2378 a = Name.rfind('.'); 2379 if (a == Name.npos || a == 0) 2380 return StringRef(); 2381 Dylib = Name.slice(a, Name.npos); 2382 if (Dylib != ".dylib") 2383 goto guess_qtx; 2384 2385 // First pull off the version letter for the form Foo.A.dylib if any. 2386 if (a >= 3) { 2387 Dot = Name.slice(a-2, a-1); 2388 if (Dot == ".") 2389 a = a - 2; 2390 } 2391 2392 b = Name.rfind('/', a); 2393 if (b == Name.npos) 2394 b = 0; 2395 else 2396 b = b+1; 2397 // ignore any suffix after an underbar like Foo_profile.A.dylib 2398 Idx = Name.rfind('_'); 2399 if (Idx != Name.npos && Idx != b) { 2400 Lib = Name.slice(b, Idx); 2401 Suffix = Name.slice(Idx, a); 2402 if (Suffix != "_debug" && Suffix != "_profile") { 2403 Suffix = StringRef(); 2404 Lib = Name.slice(b, a); 2405 } 2406 } 2407 else 2408 Lib = Name.slice(b, a); 2409 // There are incorrect library names of the form: 2410 // libATS.A_profile.dylib so check for these. 2411 if (Lib.size() >= 3) { 2412 Dot = Lib.slice(Lib.size()-2, Lib.size()-1); 2413 if (Dot == ".") 2414 Lib = Lib.slice(0, Lib.size()-2); 2415 } 2416 return Lib; 2417 2418 guess_qtx: 2419 Qtx = Name.slice(a, Name.npos); 2420 if (Qtx != ".qtx") 2421 return StringRef(); 2422 b = Name.rfind('/', a); 2423 if (b == Name.npos) 2424 Lib = Name.slice(0, a); 2425 else 2426 Lib = Name.slice(b+1, a); 2427 // There are library names of the form: QT.A.qtx so check for these. 2428 if (Lib.size() >= 3) { 2429 Dot = Lib.slice(Lib.size()-2, Lib.size()-1); 2430 if (Dot == ".") 2431 Lib = Lib.slice(0, Lib.size()-2); 2432 } 2433 return Lib; 2434 } 2435 2436 // getLibraryShortNameByIndex() is used to get the short name of the library 2437 // for an undefined symbol in a linked Mach-O binary that was linked with the 2438 // normal two-level namespace default (that is MH_TWOLEVEL in the header). 2439 // It is passed the index (0 - based) of the library as translated from 2440 // GET_LIBRARY_ORDINAL (1 - based). 2441 std::error_code MachOObjectFile::getLibraryShortNameByIndex(unsigned Index, 2442 StringRef &Res) const { 2443 if (Index >= Libraries.size()) 2444 return object_error::parse_failed; 2445 2446 // If the cache of LibrariesShortNames is not built up do that first for 2447 // all the Libraries. 2448 if (LibrariesShortNames.size() == 0) { 2449 for (unsigned i = 0; i < Libraries.size(); i++) { 2450 auto CommandOrErr = 2451 getStructOrErr<MachO::dylib_command>(*this, Libraries[i]); 2452 if (!CommandOrErr) 2453 return object_error::parse_failed; 2454 MachO::dylib_command D = CommandOrErr.get(); 2455 if (D.dylib.name >= D.cmdsize) 2456 return object_error::parse_failed; 2457 const char *P = (const char *)(Libraries[i]) + D.dylib.name; 2458 StringRef Name = StringRef(P); 2459 if (D.dylib.name+Name.size() >= D.cmdsize) 2460 return object_error::parse_failed; 2461 StringRef Suffix; 2462 bool isFramework; 2463 StringRef shortName = guessLibraryShortName(Name, isFramework, Suffix); 2464 if (shortName.empty()) 2465 LibrariesShortNames.push_back(Name); 2466 else 2467 LibrariesShortNames.push_back(shortName); 2468 } 2469 } 2470 2471 Res = LibrariesShortNames[Index]; 2472 return std::error_code(); 2473 } 2474 2475 uint32_t MachOObjectFile::getLibraryCount() const { 2476 return Libraries.size(); 2477 } 2478 2479 section_iterator 2480 MachOObjectFile::getRelocationRelocatedSection(relocation_iterator Rel) const { 2481 DataRefImpl Sec; 2482 Sec.d.a = Rel->getRawDataRefImpl().d.a; 2483 return section_iterator(SectionRef(Sec, this)); 2484 } 2485 2486 basic_symbol_iterator MachOObjectFile::symbol_begin() const { 2487 DataRefImpl DRI; 2488 MachO::symtab_command Symtab = getSymtabLoadCommand(); 2489 if (!SymtabLoadCmd || Symtab.nsyms == 0) 2490 return basic_symbol_iterator(SymbolRef(DRI, this)); 2491 2492 return getSymbolByIndex(0); 2493 } 2494 2495 basic_symbol_iterator MachOObjectFile::symbol_end() const { 2496 DataRefImpl DRI; 2497 MachO::symtab_command Symtab = getSymtabLoadCommand(); 2498 if (!SymtabLoadCmd || Symtab.nsyms == 0) 2499 return basic_symbol_iterator(SymbolRef(DRI, this)); 2500 2501 unsigned SymbolTableEntrySize = is64Bit() ? 2502 sizeof(MachO::nlist_64) : 2503 sizeof(MachO::nlist); 2504 unsigned Offset = Symtab.symoff + 2505 Symtab.nsyms * SymbolTableEntrySize; 2506 DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset)); 2507 return basic_symbol_iterator(SymbolRef(DRI, this)); 2508 } 2509 2510 symbol_iterator MachOObjectFile::getSymbolByIndex(unsigned Index) const { 2511 MachO::symtab_command Symtab = getSymtabLoadCommand(); 2512 if (!SymtabLoadCmd || Index >= Symtab.nsyms) 2513 report_fatal_error("Requested symbol index is out of range."); 2514 unsigned SymbolTableEntrySize = 2515 is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist); 2516 DataRefImpl DRI; 2517 DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Symtab.symoff)); 2518 DRI.p += Index * SymbolTableEntrySize; 2519 return basic_symbol_iterator(SymbolRef(DRI, this)); 2520 } 2521 2522 uint64_t MachOObjectFile::getSymbolIndex(DataRefImpl Symb) const { 2523 MachO::symtab_command Symtab = getSymtabLoadCommand(); 2524 if (!SymtabLoadCmd) 2525 report_fatal_error("getSymbolIndex() called with no symbol table symbol"); 2526 unsigned SymbolTableEntrySize = 2527 is64Bit() ? sizeof(MachO::nlist_64) : sizeof(MachO::nlist); 2528 DataRefImpl DRIstart; 2529 DRIstart.p = reinterpret_cast<uintptr_t>(getPtr(*this, Symtab.symoff)); 2530 uint64_t Index = (Symb.p - DRIstart.p) / SymbolTableEntrySize; 2531 return Index; 2532 } 2533 2534 section_iterator MachOObjectFile::section_begin() const { 2535 DataRefImpl DRI; 2536 return section_iterator(SectionRef(DRI, this)); 2537 } 2538 2539 section_iterator MachOObjectFile::section_end() const { 2540 DataRefImpl DRI; 2541 DRI.d.a = Sections.size(); 2542 return section_iterator(SectionRef(DRI, this)); 2543 } 2544 2545 uint8_t MachOObjectFile::getBytesInAddress() const { 2546 return is64Bit() ? 8 : 4; 2547 } 2548 2549 StringRef MachOObjectFile::getFileFormatName() const { 2550 unsigned CPUType = getCPUType(*this); 2551 if (!is64Bit()) { 2552 switch (CPUType) { 2553 case MachO::CPU_TYPE_I386: 2554 return "Mach-O 32-bit i386"; 2555 case MachO::CPU_TYPE_ARM: 2556 return "Mach-O arm"; 2557 case MachO::CPU_TYPE_ARM64_32: 2558 return "Mach-O arm64 (ILP32)"; 2559 case MachO::CPU_TYPE_POWERPC: 2560 return "Mach-O 32-bit ppc"; 2561 default: 2562 return "Mach-O 32-bit unknown"; 2563 } 2564 } 2565 2566 switch (CPUType) { 2567 case MachO::CPU_TYPE_X86_64: 2568 return "Mach-O 64-bit x86-64"; 2569 case MachO::CPU_TYPE_ARM64: 2570 return "Mach-O arm64"; 2571 case MachO::CPU_TYPE_POWERPC64: 2572 return "Mach-O 64-bit ppc64"; 2573 default: 2574 return "Mach-O 64-bit unknown"; 2575 } 2576 } 2577 2578 Triple::ArchType MachOObjectFile::getArch(uint32_t CPUType, uint32_t CPUSubType) { 2579 switch (CPUType) { 2580 case MachO::CPU_TYPE_I386: 2581 return Triple::x86; 2582 case MachO::CPU_TYPE_X86_64: 2583 return Triple::x86_64; 2584 case MachO::CPU_TYPE_ARM: 2585 return Triple::arm; 2586 case MachO::CPU_TYPE_ARM64: 2587 return Triple::aarch64; 2588 case MachO::CPU_TYPE_ARM64_32: 2589 return Triple::aarch64_32; 2590 case MachO::CPU_TYPE_POWERPC: 2591 return Triple::ppc; 2592 case MachO::CPU_TYPE_POWERPC64: 2593 return Triple::ppc64; 2594 default: 2595 return Triple::UnknownArch; 2596 } 2597 } 2598 2599 Triple MachOObjectFile::getArchTriple(uint32_t CPUType, uint32_t CPUSubType, 2600 const char **McpuDefault, 2601 const char **ArchFlag) { 2602 if (McpuDefault) 2603 *McpuDefault = nullptr; 2604 if (ArchFlag) 2605 *ArchFlag = nullptr; 2606 2607 switch (CPUType) { 2608 case MachO::CPU_TYPE_I386: 2609 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2610 case MachO::CPU_SUBTYPE_I386_ALL: 2611 if (ArchFlag) 2612 *ArchFlag = "i386"; 2613 return Triple("i386-apple-darwin"); 2614 default: 2615 return Triple(); 2616 } 2617 case MachO::CPU_TYPE_X86_64: 2618 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2619 case MachO::CPU_SUBTYPE_X86_64_ALL: 2620 if (ArchFlag) 2621 *ArchFlag = "x86_64"; 2622 return Triple("x86_64-apple-darwin"); 2623 case MachO::CPU_SUBTYPE_X86_64_H: 2624 if (ArchFlag) 2625 *ArchFlag = "x86_64h"; 2626 return Triple("x86_64h-apple-darwin"); 2627 default: 2628 return Triple(); 2629 } 2630 case MachO::CPU_TYPE_ARM: 2631 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2632 case MachO::CPU_SUBTYPE_ARM_V4T: 2633 if (ArchFlag) 2634 *ArchFlag = "armv4t"; 2635 return Triple("armv4t-apple-darwin"); 2636 case MachO::CPU_SUBTYPE_ARM_V5TEJ: 2637 if (ArchFlag) 2638 *ArchFlag = "armv5e"; 2639 return Triple("armv5e-apple-darwin"); 2640 case MachO::CPU_SUBTYPE_ARM_XSCALE: 2641 if (ArchFlag) 2642 *ArchFlag = "xscale"; 2643 return Triple("xscale-apple-darwin"); 2644 case MachO::CPU_SUBTYPE_ARM_V6: 2645 if (ArchFlag) 2646 *ArchFlag = "armv6"; 2647 return Triple("armv6-apple-darwin"); 2648 case MachO::CPU_SUBTYPE_ARM_V6M: 2649 if (McpuDefault) 2650 *McpuDefault = "cortex-m0"; 2651 if (ArchFlag) 2652 *ArchFlag = "armv6m"; 2653 return Triple("armv6m-apple-darwin"); 2654 case MachO::CPU_SUBTYPE_ARM_V7: 2655 if (ArchFlag) 2656 *ArchFlag = "armv7"; 2657 return Triple("armv7-apple-darwin"); 2658 case MachO::CPU_SUBTYPE_ARM_V7EM: 2659 if (McpuDefault) 2660 *McpuDefault = "cortex-m4"; 2661 if (ArchFlag) 2662 *ArchFlag = "armv7em"; 2663 return Triple("thumbv7em-apple-darwin"); 2664 case MachO::CPU_SUBTYPE_ARM_V7K: 2665 if (McpuDefault) 2666 *McpuDefault = "cortex-a7"; 2667 if (ArchFlag) 2668 *ArchFlag = "armv7k"; 2669 return Triple("armv7k-apple-darwin"); 2670 case MachO::CPU_SUBTYPE_ARM_V7M: 2671 if (McpuDefault) 2672 *McpuDefault = "cortex-m3"; 2673 if (ArchFlag) 2674 *ArchFlag = "armv7m"; 2675 return Triple("thumbv7m-apple-darwin"); 2676 case MachO::CPU_SUBTYPE_ARM_V7S: 2677 if (McpuDefault) 2678 *McpuDefault = "cortex-a7"; 2679 if (ArchFlag) 2680 *ArchFlag = "armv7s"; 2681 return Triple("armv7s-apple-darwin"); 2682 default: 2683 return Triple(); 2684 } 2685 case MachO::CPU_TYPE_ARM64: 2686 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2687 case MachO::CPU_SUBTYPE_ARM64_ALL: 2688 if (McpuDefault) 2689 *McpuDefault = "cyclone"; 2690 if (ArchFlag) 2691 *ArchFlag = "arm64"; 2692 return Triple("arm64-apple-darwin"); 2693 default: 2694 return Triple(); 2695 } 2696 case MachO::CPU_TYPE_ARM64_32: 2697 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2698 case MachO::CPU_SUBTYPE_ARM64_32_V8: 2699 if (McpuDefault) 2700 *McpuDefault = "cyclone"; 2701 if (ArchFlag) 2702 *ArchFlag = "arm64_32"; 2703 return Triple("arm64_32-apple-darwin"); 2704 default: 2705 return Triple(); 2706 } 2707 case MachO::CPU_TYPE_POWERPC: 2708 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2709 case MachO::CPU_SUBTYPE_POWERPC_ALL: 2710 if (ArchFlag) 2711 *ArchFlag = "ppc"; 2712 return Triple("ppc-apple-darwin"); 2713 default: 2714 return Triple(); 2715 } 2716 case MachO::CPU_TYPE_POWERPC64: 2717 switch (CPUSubType & ~MachO::CPU_SUBTYPE_MASK) { 2718 case MachO::CPU_SUBTYPE_POWERPC_ALL: 2719 if (ArchFlag) 2720 *ArchFlag = "ppc64"; 2721 return Triple("ppc64-apple-darwin"); 2722 default: 2723 return Triple(); 2724 } 2725 default: 2726 return Triple(); 2727 } 2728 } 2729 2730 Triple MachOObjectFile::getHostArch() { 2731 return Triple(sys::getDefaultTargetTriple()); 2732 } 2733 2734 bool MachOObjectFile::isValidArch(StringRef ArchFlag) { 2735 auto validArchs = getValidArchs(); 2736 return llvm::find(validArchs, ArchFlag) != validArchs.end(); 2737 } 2738 2739 ArrayRef<StringRef> MachOObjectFile::getValidArchs() { 2740 static const std::array<StringRef, 17> validArchs = {{ 2741 "i386", "x86_64", "x86_64h", "armv4t", "arm", "armv5e", 2742 "armv6", "armv6m", "armv7", "armv7em", "armv7k", "armv7m", 2743 "armv7s", "arm64", "arm64_32", "ppc", "ppc64", 2744 }}; 2745 2746 return validArchs; 2747 } 2748 2749 Triple::ArchType MachOObjectFile::getArch() const { 2750 return getArch(getCPUType(*this), getCPUSubType(*this)); 2751 } 2752 2753 Triple MachOObjectFile::getArchTriple(const char **McpuDefault) const { 2754 return getArchTriple(Header.cputype, Header.cpusubtype, McpuDefault); 2755 } 2756 2757 relocation_iterator MachOObjectFile::section_rel_begin(unsigned Index) const { 2758 DataRefImpl DRI; 2759 DRI.d.a = Index; 2760 return section_rel_begin(DRI); 2761 } 2762 2763 relocation_iterator MachOObjectFile::section_rel_end(unsigned Index) const { 2764 DataRefImpl DRI; 2765 DRI.d.a = Index; 2766 return section_rel_end(DRI); 2767 } 2768 2769 dice_iterator MachOObjectFile::begin_dices() const { 2770 DataRefImpl DRI; 2771 if (!DataInCodeLoadCmd) 2772 return dice_iterator(DiceRef(DRI, this)); 2773 2774 MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand(); 2775 DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, DicLC.dataoff)); 2776 return dice_iterator(DiceRef(DRI, this)); 2777 } 2778 2779 dice_iterator MachOObjectFile::end_dices() const { 2780 DataRefImpl DRI; 2781 if (!DataInCodeLoadCmd) 2782 return dice_iterator(DiceRef(DRI, this)); 2783 2784 MachO::linkedit_data_command DicLC = getDataInCodeLoadCommand(); 2785 unsigned Offset = DicLC.dataoff + DicLC.datasize; 2786 DRI.p = reinterpret_cast<uintptr_t>(getPtr(*this, Offset)); 2787 return dice_iterator(DiceRef(DRI, this)); 2788 } 2789 2790 ExportEntry::ExportEntry(Error *E, const MachOObjectFile *O, 2791 ArrayRef<uint8_t> T) : E(E), O(O), Trie(T) {} 2792 2793 void ExportEntry::moveToFirst() { 2794 ErrorAsOutParameter ErrAsOutParam(E); 2795 pushNode(0); 2796 if (*E) 2797 return; 2798 pushDownUntilBottom(); 2799 } 2800 2801 void ExportEntry::moveToEnd() { 2802 Stack.clear(); 2803 Done = true; 2804 } 2805 2806 bool ExportEntry::operator==(const ExportEntry &Other) const { 2807 // Common case, one at end, other iterating from begin. 2808 if (Done || Other.Done) 2809 return (Done == Other.Done); 2810 // Not equal if different stack sizes. 2811 if (Stack.size() != Other.Stack.size()) 2812 return false; 2813 // Not equal if different cumulative strings. 2814 if (!CumulativeString.equals(Other.CumulativeString)) 2815 return false; 2816 // Equal if all nodes in both stacks match. 2817 for (unsigned i=0; i < Stack.size(); ++i) { 2818 if (Stack[i].Start != Other.Stack[i].Start) 2819 return false; 2820 } 2821 return true; 2822 } 2823 2824 uint64_t ExportEntry::readULEB128(const uint8_t *&Ptr, const char **error) { 2825 unsigned Count; 2826 uint64_t Result = decodeULEB128(Ptr, &Count, Trie.end(), error); 2827 Ptr += Count; 2828 if (Ptr > Trie.end()) 2829 Ptr = Trie.end(); 2830 return Result; 2831 } 2832 2833 StringRef ExportEntry::name() const { 2834 return CumulativeString; 2835 } 2836 2837 uint64_t ExportEntry::flags() const { 2838 return Stack.back().Flags; 2839 } 2840 2841 uint64_t ExportEntry::address() const { 2842 return Stack.back().Address; 2843 } 2844 2845 uint64_t ExportEntry::other() const { 2846 return Stack.back().Other; 2847 } 2848 2849 StringRef ExportEntry::otherName() const { 2850 const char* ImportName = Stack.back().ImportName; 2851 if (ImportName) 2852 return StringRef(ImportName); 2853 return StringRef(); 2854 } 2855 2856 uint32_t ExportEntry::nodeOffset() const { 2857 return Stack.back().Start - Trie.begin(); 2858 } 2859 2860 ExportEntry::NodeState::NodeState(const uint8_t *Ptr) 2861 : Start(Ptr), Current(Ptr) {} 2862 2863 void ExportEntry::pushNode(uint64_t offset) { 2864 ErrorAsOutParameter ErrAsOutParam(E); 2865 const uint8_t *Ptr = Trie.begin() + offset; 2866 NodeState State(Ptr); 2867 const char *error; 2868 uint64_t ExportInfoSize = readULEB128(State.Current, &error); 2869 if (error) { 2870 *E = malformedError("export info size " + Twine(error) + 2871 " in export trie data at node: 0x" + 2872 Twine::utohexstr(offset)); 2873 moveToEnd(); 2874 return; 2875 } 2876 State.IsExportNode = (ExportInfoSize != 0); 2877 const uint8_t* Children = State.Current + ExportInfoSize; 2878 if (Children > Trie.end()) { 2879 *E = malformedError( 2880 "export info size: 0x" + Twine::utohexstr(ExportInfoSize) + 2881 " in export trie data at node: 0x" + Twine::utohexstr(offset) + 2882 " too big and extends past end of trie data"); 2883 moveToEnd(); 2884 return; 2885 } 2886 if (State.IsExportNode) { 2887 const uint8_t *ExportStart = State.Current; 2888 State.Flags = readULEB128(State.Current, &error); 2889 if (error) { 2890 *E = malformedError("flags " + Twine(error) + 2891 " in export trie data at node: 0x" + 2892 Twine::utohexstr(offset)); 2893 moveToEnd(); 2894 return; 2895 } 2896 uint64_t Kind = State.Flags & MachO::EXPORT_SYMBOL_FLAGS_KIND_MASK; 2897 if (State.Flags != 0 && 2898 (Kind != MachO::EXPORT_SYMBOL_FLAGS_KIND_REGULAR && 2899 Kind != MachO::EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE && 2900 Kind != MachO::EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL)) { 2901 *E = malformedError( 2902 "unsupported exported symbol kind: " + Twine((int)Kind) + 2903 " in flags: 0x" + Twine::utohexstr(State.Flags) + 2904 " in export trie data at node: 0x" + Twine::utohexstr(offset)); 2905 moveToEnd(); 2906 return; 2907 } 2908 if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT) { 2909 State.Address = 0; 2910 State.Other = readULEB128(State.Current, &error); // dylib ordinal 2911 if (error) { 2912 *E = malformedError("dylib ordinal of re-export " + Twine(error) + 2913 " in export trie data at node: 0x" + 2914 Twine::utohexstr(offset)); 2915 moveToEnd(); 2916 return; 2917 } 2918 if (O != nullptr) { 2919 if (State.Other > O->getLibraryCount()) { 2920 *E = malformedError( 2921 "bad library ordinal: " + Twine((int)State.Other) + " (max " + 2922 Twine((int)O->getLibraryCount()) + 2923 ") in export trie data at node: 0x" + Twine::utohexstr(offset)); 2924 moveToEnd(); 2925 return; 2926 } 2927 } 2928 State.ImportName = reinterpret_cast<const char*>(State.Current); 2929 if (*State.ImportName == '\0') { 2930 State.Current++; 2931 } else { 2932 const uint8_t *End = State.Current + 1; 2933 if (End >= Trie.end()) { 2934 *E = malformedError("import name of re-export in export trie data at " 2935 "node: 0x" + 2936 Twine::utohexstr(offset) + 2937 " starts past end of trie data"); 2938 moveToEnd(); 2939 return; 2940 } 2941 while(*End != '\0' && End < Trie.end()) 2942 End++; 2943 if (*End != '\0') { 2944 *E = malformedError("import name of re-export in export trie data at " 2945 "node: 0x" + 2946 Twine::utohexstr(offset) + 2947 " extends past end of trie data"); 2948 moveToEnd(); 2949 return; 2950 } 2951 State.Current = End + 1; 2952 } 2953 } else { 2954 State.Address = readULEB128(State.Current, &error); 2955 if (error) { 2956 *E = malformedError("address " + Twine(error) + 2957 " in export trie data at node: 0x" + 2958 Twine::utohexstr(offset)); 2959 moveToEnd(); 2960 return; 2961 } 2962 if (State.Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER) { 2963 State.Other = readULEB128(State.Current, &error); 2964 if (error) { 2965 *E = malformedError("resolver of stub and resolver " + Twine(error) + 2966 " in export trie data at node: 0x" + 2967 Twine::utohexstr(offset)); 2968 moveToEnd(); 2969 return; 2970 } 2971 } 2972 } 2973 if(ExportStart + ExportInfoSize != State.Current) { 2974 *E = malformedError( 2975 "inconsistant export info size: 0x" + 2976 Twine::utohexstr(ExportInfoSize) + " where actual size was: 0x" + 2977 Twine::utohexstr(State.Current - ExportStart) + 2978 " in export trie data at node: 0x" + Twine::utohexstr(offset)); 2979 moveToEnd(); 2980 return; 2981 } 2982 } 2983 State.ChildCount = *Children; 2984 if (State.ChildCount != 0 && Children + 1 >= Trie.end()) { 2985 *E = malformedError("byte for count of childern in export trie data at " 2986 "node: 0x" + 2987 Twine::utohexstr(offset) + 2988 " extends past end of trie data"); 2989 moveToEnd(); 2990 return; 2991 } 2992 State.Current = Children + 1; 2993 State.NextChildIndex = 0; 2994 State.ParentStringLength = CumulativeString.size(); 2995 Stack.push_back(State); 2996 } 2997 2998 void ExportEntry::pushDownUntilBottom() { 2999 ErrorAsOutParameter ErrAsOutParam(E); 3000 const char *error; 3001 while (Stack.back().NextChildIndex < Stack.back().ChildCount) { 3002 NodeState &Top = Stack.back(); 3003 CumulativeString.resize(Top.ParentStringLength); 3004 for (;*Top.Current != 0 && Top.Current < Trie.end(); Top.Current++) { 3005 char C = *Top.Current; 3006 CumulativeString.push_back(C); 3007 } 3008 if (Top.Current >= Trie.end()) { 3009 *E = malformedError("edge sub-string in export trie data at node: 0x" + 3010 Twine::utohexstr(Top.Start - Trie.begin()) + 3011 " for child #" + Twine((int)Top.NextChildIndex) + 3012 " extends past end of trie data"); 3013 moveToEnd(); 3014 return; 3015 } 3016 Top.Current += 1; 3017 uint64_t childNodeIndex = readULEB128(Top.Current, &error); 3018 if (error) { 3019 *E = malformedError("child node offset " + Twine(error) + 3020 " in export trie data at node: 0x" + 3021 Twine::utohexstr(Top.Start - Trie.begin())); 3022 moveToEnd(); 3023 return; 3024 } 3025 for (const NodeState &node : nodes()) { 3026 if (node.Start == Trie.begin() + childNodeIndex){ 3027 *E = malformedError("loop in childern in export trie data at node: 0x" + 3028 Twine::utohexstr(Top.Start - Trie.begin()) + 3029 " back to node: 0x" + 3030 Twine::utohexstr(childNodeIndex)); 3031 moveToEnd(); 3032 return; 3033 } 3034 } 3035 Top.NextChildIndex += 1; 3036 pushNode(childNodeIndex); 3037 if (*E) 3038 return; 3039 } 3040 if (!Stack.back().IsExportNode) { 3041 *E = malformedError("node is not an export node in export trie data at " 3042 "node: 0x" + 3043 Twine::utohexstr(Stack.back().Start - Trie.begin())); 3044 moveToEnd(); 3045 return; 3046 } 3047 } 3048 3049 // We have a trie data structure and need a way to walk it that is compatible 3050 // with the C++ iterator model. The solution is a non-recursive depth first 3051 // traversal where the iterator contains a stack of parent nodes along with a 3052 // string that is the accumulation of all edge strings along the parent chain 3053 // to this point. 3054 // 3055 // There is one "export" node for each exported symbol. But because some 3056 // symbols may be a prefix of another symbol (e.g. _dup and _dup2), an export 3057 // node may have child nodes too. 3058 // 3059 // The algorithm for moveNext() is to keep moving down the leftmost unvisited 3060 // child until hitting a node with no children (which is an export node or 3061 // else the trie is malformed). On the way down, each node is pushed on the 3062 // stack ivar. If there is no more ways down, it pops up one and tries to go 3063 // down a sibling path until a childless node is reached. 3064 void ExportEntry::moveNext() { 3065 assert(!Stack.empty() && "ExportEntry::moveNext() with empty node stack"); 3066 if (!Stack.back().IsExportNode) { 3067 *E = malformedError("node is not an export node in export trie data at " 3068 "node: 0x" + 3069 Twine::utohexstr(Stack.back().Start - Trie.begin())); 3070 moveToEnd(); 3071 return; 3072 } 3073 3074 Stack.pop_back(); 3075 while (!Stack.empty()) { 3076 NodeState &Top = Stack.back(); 3077 if (Top.NextChildIndex < Top.ChildCount) { 3078 pushDownUntilBottom(); 3079 // Now at the next export node. 3080 return; 3081 } else { 3082 if (Top.IsExportNode) { 3083 // This node has no children but is itself an export node. 3084 CumulativeString.resize(Top.ParentStringLength); 3085 return; 3086 } 3087 Stack.pop_back(); 3088 } 3089 } 3090 Done = true; 3091 } 3092 3093 iterator_range<export_iterator> 3094 MachOObjectFile::exports(Error &E, ArrayRef<uint8_t> Trie, 3095 const MachOObjectFile *O) { 3096 ExportEntry Start(&E, O, Trie); 3097 if (Trie.empty()) 3098 Start.moveToEnd(); 3099 else 3100 Start.moveToFirst(); 3101 3102 ExportEntry Finish(&E, O, Trie); 3103 Finish.moveToEnd(); 3104 3105 return make_range(export_iterator(Start), export_iterator(Finish)); 3106 } 3107 3108 iterator_range<export_iterator> MachOObjectFile::exports(Error &Err) const { 3109 return exports(Err, getDyldInfoExportsTrie(), this); 3110 } 3111 3112 MachORebaseEntry::MachORebaseEntry(Error *E, const MachOObjectFile *O, 3113 ArrayRef<uint8_t> Bytes, bool is64Bit) 3114 : E(E), O(O), Opcodes(Bytes), Ptr(Bytes.begin()), 3115 PointerSize(is64Bit ? 8 : 4) {} 3116 3117 void MachORebaseEntry::moveToFirst() { 3118 Ptr = Opcodes.begin(); 3119 moveNext(); 3120 } 3121 3122 void MachORebaseEntry::moveToEnd() { 3123 Ptr = Opcodes.end(); 3124 RemainingLoopCount = 0; 3125 Done = true; 3126 } 3127 3128 void MachORebaseEntry::moveNext() { 3129 ErrorAsOutParameter ErrAsOutParam(E); 3130 // If in the middle of some loop, move to next rebasing in loop. 3131 SegmentOffset += AdvanceAmount; 3132 if (RemainingLoopCount) { 3133 --RemainingLoopCount; 3134 return; 3135 } 3136 // REBASE_OPCODE_DONE is only used for padding if we are not aligned to 3137 // pointer size. Therefore it is possible to reach the end without ever having 3138 // seen REBASE_OPCODE_DONE. 3139 if (Ptr == Opcodes.end()) { 3140 Done = true; 3141 return; 3142 } 3143 bool More = true; 3144 while (More) { 3145 // Parse next opcode and set up next loop. 3146 const uint8_t *OpcodeStart = Ptr; 3147 uint8_t Byte = *Ptr++; 3148 uint8_t ImmValue = Byte & MachO::REBASE_IMMEDIATE_MASK; 3149 uint8_t Opcode = Byte & MachO::REBASE_OPCODE_MASK; 3150 uint32_t Count, Skip; 3151 const char *error = nullptr; 3152 switch (Opcode) { 3153 case MachO::REBASE_OPCODE_DONE: 3154 More = false; 3155 Done = true; 3156 moveToEnd(); 3157 DEBUG_WITH_TYPE("mach-o-rebase", dbgs() << "REBASE_OPCODE_DONE\n"); 3158 break; 3159 case MachO::REBASE_OPCODE_SET_TYPE_IMM: 3160 RebaseType = ImmValue; 3161 if (RebaseType > MachO::REBASE_TYPE_TEXT_PCREL32) { 3162 *E = malformedError("for REBASE_OPCODE_SET_TYPE_IMM bad bind type: " + 3163 Twine((int)RebaseType) + " for opcode at: 0x" + 3164 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3165 moveToEnd(); 3166 return; 3167 } 3168 DEBUG_WITH_TYPE( 3169 "mach-o-rebase", 3170 dbgs() << "REBASE_OPCODE_SET_TYPE_IMM: " 3171 << "RebaseType=" << (int) RebaseType << "\n"); 3172 break; 3173 case MachO::REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 3174 SegmentIndex = ImmValue; 3175 SegmentOffset = readULEB128(&error); 3176 if (error) { 3177 *E = malformedError("for REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " + 3178 Twine(error) + " for opcode at: 0x" + 3179 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3180 moveToEnd(); 3181 return; 3182 } 3183 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3184 PointerSize); 3185 if (error) { 3186 *E = malformedError("for REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " + 3187 Twine(error) + " for opcode at: 0x" + 3188 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3189 moveToEnd(); 3190 return; 3191 } 3192 DEBUG_WITH_TYPE( 3193 "mach-o-rebase", 3194 dbgs() << "REBASE_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: " 3195 << "SegmentIndex=" << SegmentIndex << ", " 3196 << format("SegmentOffset=0x%06X", SegmentOffset) 3197 << "\n"); 3198 break; 3199 case MachO::REBASE_OPCODE_ADD_ADDR_ULEB: 3200 SegmentOffset += readULEB128(&error); 3201 if (error) { 3202 *E = malformedError("for REBASE_OPCODE_ADD_ADDR_ULEB " + Twine(error) + 3203 " for opcode at: 0x" + 3204 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3205 moveToEnd(); 3206 return; 3207 } 3208 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3209 PointerSize); 3210 if (error) { 3211 *E = malformedError("for REBASE_OPCODE_ADD_ADDR_ULEB " + Twine(error) + 3212 " for opcode at: 0x" + 3213 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3214 moveToEnd(); 3215 return; 3216 } 3217 DEBUG_WITH_TYPE("mach-o-rebase", 3218 dbgs() << "REBASE_OPCODE_ADD_ADDR_ULEB: " 3219 << format("SegmentOffset=0x%06X", 3220 SegmentOffset) << "\n"); 3221 break; 3222 case MachO::REBASE_OPCODE_ADD_ADDR_IMM_SCALED: 3223 SegmentOffset += ImmValue * PointerSize; 3224 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3225 PointerSize); 3226 if (error) { 3227 *E = malformedError("for REBASE_OPCODE_ADD_ADDR_IMM_SCALED " + 3228 Twine(error) + " for opcode at: 0x" + 3229 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3230 moveToEnd(); 3231 return; 3232 } 3233 DEBUG_WITH_TYPE("mach-o-rebase", 3234 dbgs() << "REBASE_OPCODE_ADD_ADDR_IMM_SCALED: " 3235 << format("SegmentOffset=0x%06X", 3236 SegmentOffset) << "\n"); 3237 break; 3238 case MachO::REBASE_OPCODE_DO_REBASE_IMM_TIMES: 3239 AdvanceAmount = PointerSize; 3240 Skip = 0; 3241 Count = ImmValue; 3242 if (ImmValue != 0) 3243 RemainingLoopCount = ImmValue - 1; 3244 else 3245 RemainingLoopCount = 0; 3246 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3247 PointerSize, Count, Skip); 3248 if (error) { 3249 *E = malformedError("for REBASE_OPCODE_DO_REBASE_IMM_TIMES " + 3250 Twine(error) + " for opcode at: 0x" + 3251 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3252 moveToEnd(); 3253 return; 3254 } 3255 DEBUG_WITH_TYPE( 3256 "mach-o-rebase", 3257 dbgs() << "REBASE_OPCODE_DO_REBASE_IMM_TIMES: " 3258 << format("SegmentOffset=0x%06X", SegmentOffset) 3259 << ", AdvanceAmount=" << AdvanceAmount 3260 << ", RemainingLoopCount=" << RemainingLoopCount 3261 << "\n"); 3262 return; 3263 case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES: 3264 AdvanceAmount = PointerSize; 3265 Skip = 0; 3266 Count = readULEB128(&error); 3267 if (error) { 3268 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES " + 3269 Twine(error) + " for opcode at: 0x" + 3270 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3271 moveToEnd(); 3272 return; 3273 } 3274 if (Count != 0) 3275 RemainingLoopCount = Count - 1; 3276 else 3277 RemainingLoopCount = 0; 3278 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3279 PointerSize, Count, Skip); 3280 if (error) { 3281 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES " + 3282 Twine(error) + " for opcode at: 0x" + 3283 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3284 moveToEnd(); 3285 return; 3286 } 3287 DEBUG_WITH_TYPE( 3288 "mach-o-rebase", 3289 dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES: " 3290 << format("SegmentOffset=0x%06X", SegmentOffset) 3291 << ", AdvanceAmount=" << AdvanceAmount 3292 << ", RemainingLoopCount=" << RemainingLoopCount 3293 << "\n"); 3294 return; 3295 case MachO::REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: 3296 Skip = readULEB128(&error); 3297 if (error) { 3298 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB " + 3299 Twine(error) + " for opcode at: 0x" + 3300 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3301 moveToEnd(); 3302 return; 3303 } 3304 AdvanceAmount = Skip + PointerSize; 3305 Count = 1; 3306 RemainingLoopCount = 0; 3307 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3308 PointerSize, Count, Skip); 3309 if (error) { 3310 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB " + 3311 Twine(error) + " for opcode at: 0x" + 3312 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3313 moveToEnd(); 3314 return; 3315 } 3316 DEBUG_WITH_TYPE( 3317 "mach-o-rebase", 3318 dbgs() << "REBASE_OPCODE_DO_REBASE_ADD_ADDR_ULEB: " 3319 << format("SegmentOffset=0x%06X", SegmentOffset) 3320 << ", AdvanceAmount=" << AdvanceAmount 3321 << ", RemainingLoopCount=" << RemainingLoopCount 3322 << "\n"); 3323 return; 3324 case MachO::REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: 3325 Count = readULEB128(&error); 3326 if (error) { 3327 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_" 3328 "ULEB " + 3329 Twine(error) + " for opcode at: 0x" + 3330 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3331 moveToEnd(); 3332 return; 3333 } 3334 if (Count != 0) 3335 RemainingLoopCount = Count - 1; 3336 else 3337 RemainingLoopCount = 0; 3338 Skip = readULEB128(&error); 3339 if (error) { 3340 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_" 3341 "ULEB " + 3342 Twine(error) + " for opcode at: 0x" + 3343 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3344 moveToEnd(); 3345 return; 3346 } 3347 AdvanceAmount = Skip + PointerSize; 3348 3349 error = O->RebaseEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3350 PointerSize, Count, Skip); 3351 if (error) { 3352 *E = malformedError("for REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_" 3353 "ULEB " + 3354 Twine(error) + " for opcode at: 0x" + 3355 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3356 moveToEnd(); 3357 return; 3358 } 3359 DEBUG_WITH_TYPE( 3360 "mach-o-rebase", 3361 dbgs() << "REBASE_OPCODE_DO_REBASE_ULEB_TIMES_SKIPPING_ULEB: " 3362 << format("SegmentOffset=0x%06X", SegmentOffset) 3363 << ", AdvanceAmount=" << AdvanceAmount 3364 << ", RemainingLoopCount=" << RemainingLoopCount 3365 << "\n"); 3366 return; 3367 default: 3368 *E = malformedError("bad rebase info (bad opcode value 0x" + 3369 Twine::utohexstr(Opcode) + " for opcode at: 0x" + 3370 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3371 moveToEnd(); 3372 return; 3373 } 3374 } 3375 } 3376 3377 uint64_t MachORebaseEntry::readULEB128(const char **error) { 3378 unsigned Count; 3379 uint64_t Result = decodeULEB128(Ptr, &Count, Opcodes.end(), error); 3380 Ptr += Count; 3381 if (Ptr > Opcodes.end()) 3382 Ptr = Opcodes.end(); 3383 return Result; 3384 } 3385 3386 int32_t MachORebaseEntry::segmentIndex() const { return SegmentIndex; } 3387 3388 uint64_t MachORebaseEntry::segmentOffset() const { return SegmentOffset; } 3389 3390 StringRef MachORebaseEntry::typeName() const { 3391 switch (RebaseType) { 3392 case MachO::REBASE_TYPE_POINTER: 3393 return "pointer"; 3394 case MachO::REBASE_TYPE_TEXT_ABSOLUTE32: 3395 return "text abs32"; 3396 case MachO::REBASE_TYPE_TEXT_PCREL32: 3397 return "text rel32"; 3398 } 3399 return "unknown"; 3400 } 3401 3402 // For use with the SegIndex of a checked Mach-O Rebase entry 3403 // to get the segment name. 3404 StringRef MachORebaseEntry::segmentName() const { 3405 return O->BindRebaseSegmentName(SegmentIndex); 3406 } 3407 3408 // For use with a SegIndex,SegOffset pair from a checked Mach-O Rebase entry 3409 // to get the section name. 3410 StringRef MachORebaseEntry::sectionName() const { 3411 return O->BindRebaseSectionName(SegmentIndex, SegmentOffset); 3412 } 3413 3414 // For use with a SegIndex,SegOffset pair from a checked Mach-O Rebase entry 3415 // to get the address. 3416 uint64_t MachORebaseEntry::address() const { 3417 return O->BindRebaseAddress(SegmentIndex, SegmentOffset); 3418 } 3419 3420 bool MachORebaseEntry::operator==(const MachORebaseEntry &Other) const { 3421 #ifdef EXPENSIVE_CHECKS 3422 assert(Opcodes == Other.Opcodes && "compare iterators of different files"); 3423 #else 3424 assert(Opcodes.data() == Other.Opcodes.data() && "compare iterators of different files"); 3425 #endif 3426 return (Ptr == Other.Ptr) && 3427 (RemainingLoopCount == Other.RemainingLoopCount) && 3428 (Done == Other.Done); 3429 } 3430 3431 iterator_range<rebase_iterator> 3432 MachOObjectFile::rebaseTable(Error &Err, MachOObjectFile *O, 3433 ArrayRef<uint8_t> Opcodes, bool is64) { 3434 if (O->BindRebaseSectionTable == nullptr) 3435 O->BindRebaseSectionTable = std::make_unique<BindRebaseSegInfo>(O); 3436 MachORebaseEntry Start(&Err, O, Opcodes, is64); 3437 Start.moveToFirst(); 3438 3439 MachORebaseEntry Finish(&Err, O, Opcodes, is64); 3440 Finish.moveToEnd(); 3441 3442 return make_range(rebase_iterator(Start), rebase_iterator(Finish)); 3443 } 3444 3445 iterator_range<rebase_iterator> MachOObjectFile::rebaseTable(Error &Err) { 3446 return rebaseTable(Err, this, getDyldInfoRebaseOpcodes(), is64Bit()); 3447 } 3448 3449 MachOBindEntry::MachOBindEntry(Error *E, const MachOObjectFile *O, 3450 ArrayRef<uint8_t> Bytes, bool is64Bit, Kind BK) 3451 : E(E), O(O), Opcodes(Bytes), Ptr(Bytes.begin()), 3452 PointerSize(is64Bit ? 8 : 4), TableKind(BK) {} 3453 3454 void MachOBindEntry::moveToFirst() { 3455 Ptr = Opcodes.begin(); 3456 moveNext(); 3457 } 3458 3459 void MachOBindEntry::moveToEnd() { 3460 Ptr = Opcodes.end(); 3461 RemainingLoopCount = 0; 3462 Done = true; 3463 } 3464 3465 void MachOBindEntry::moveNext() { 3466 ErrorAsOutParameter ErrAsOutParam(E); 3467 // If in the middle of some loop, move to next binding in loop. 3468 SegmentOffset += AdvanceAmount; 3469 if (RemainingLoopCount) { 3470 --RemainingLoopCount; 3471 return; 3472 } 3473 // BIND_OPCODE_DONE is only used for padding if we are not aligned to 3474 // pointer size. Therefore it is possible to reach the end without ever having 3475 // seen BIND_OPCODE_DONE. 3476 if (Ptr == Opcodes.end()) { 3477 Done = true; 3478 return; 3479 } 3480 bool More = true; 3481 while (More) { 3482 // Parse next opcode and set up next loop. 3483 const uint8_t *OpcodeStart = Ptr; 3484 uint8_t Byte = *Ptr++; 3485 uint8_t ImmValue = Byte & MachO::BIND_IMMEDIATE_MASK; 3486 uint8_t Opcode = Byte & MachO::BIND_OPCODE_MASK; 3487 int8_t SignExtended; 3488 const uint8_t *SymStart; 3489 uint32_t Count, Skip; 3490 const char *error = nullptr; 3491 switch (Opcode) { 3492 case MachO::BIND_OPCODE_DONE: 3493 if (TableKind == Kind::Lazy) { 3494 // Lazying bindings have a DONE opcode between entries. Need to ignore 3495 // it to advance to next entry. But need not if this is last entry. 3496 bool NotLastEntry = false; 3497 for (const uint8_t *P = Ptr; P < Opcodes.end(); ++P) { 3498 if (*P) { 3499 NotLastEntry = true; 3500 } 3501 } 3502 if (NotLastEntry) 3503 break; 3504 } 3505 More = false; 3506 moveToEnd(); 3507 DEBUG_WITH_TYPE("mach-o-bind", dbgs() << "BIND_OPCODE_DONE\n"); 3508 break; 3509 case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: 3510 if (TableKind == Kind::Weak) { 3511 *E = malformedError("BIND_OPCODE_SET_DYLIB_ORDINAL_IMM not allowed in " 3512 "weak bind table for opcode at: 0x" + 3513 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3514 moveToEnd(); 3515 return; 3516 } 3517 Ordinal = ImmValue; 3518 LibraryOrdinalSet = true; 3519 if (ImmValue > O->getLibraryCount()) { 3520 *E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB bad " 3521 "library ordinal: " + 3522 Twine((int)ImmValue) + " (max " + 3523 Twine((int)O->getLibraryCount()) + 3524 ") for opcode at: 0x" + 3525 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3526 moveToEnd(); 3527 return; 3528 } 3529 DEBUG_WITH_TYPE( 3530 "mach-o-bind", 3531 dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_IMM: " 3532 << "Ordinal=" << Ordinal << "\n"); 3533 break; 3534 case MachO::BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: 3535 if (TableKind == Kind::Weak) { 3536 *E = malformedError("BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB not allowed in " 3537 "weak bind table for opcode at: 0x" + 3538 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3539 moveToEnd(); 3540 return; 3541 } 3542 Ordinal = readULEB128(&error); 3543 LibraryOrdinalSet = true; 3544 if (error) { 3545 *E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB " + 3546 Twine(error) + " for opcode at: 0x" + 3547 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3548 moveToEnd(); 3549 return; 3550 } 3551 if (Ordinal > (int)O->getLibraryCount()) { 3552 *E = malformedError("for BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB bad " 3553 "library ordinal: " + 3554 Twine((int)Ordinal) + " (max " + 3555 Twine((int)O->getLibraryCount()) + 3556 ") for opcode at: 0x" + 3557 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3558 moveToEnd(); 3559 return; 3560 } 3561 DEBUG_WITH_TYPE( 3562 "mach-o-bind", 3563 dbgs() << "BIND_OPCODE_SET_DYLIB_ORDINAL_ULEB: " 3564 << "Ordinal=" << Ordinal << "\n"); 3565 break; 3566 case MachO::BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: 3567 if (TableKind == Kind::Weak) { 3568 *E = malformedError("BIND_OPCODE_SET_DYLIB_SPECIAL_IMM not allowed in " 3569 "weak bind table for opcode at: 0x" + 3570 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3571 moveToEnd(); 3572 return; 3573 } 3574 if (ImmValue) { 3575 SignExtended = MachO::BIND_OPCODE_MASK | ImmValue; 3576 Ordinal = SignExtended; 3577 if (Ordinal < MachO::BIND_SPECIAL_DYLIB_FLAT_LOOKUP) { 3578 *E = malformedError("for BIND_OPCODE_SET_DYLIB_SPECIAL_IMM unknown " 3579 "special ordinal: " + 3580 Twine((int)Ordinal) + " for opcode at: 0x" + 3581 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3582 moveToEnd(); 3583 return; 3584 } 3585 } else 3586 Ordinal = 0; 3587 LibraryOrdinalSet = true; 3588 DEBUG_WITH_TYPE( 3589 "mach-o-bind", 3590 dbgs() << "BIND_OPCODE_SET_DYLIB_SPECIAL_IMM: " 3591 << "Ordinal=" << Ordinal << "\n"); 3592 break; 3593 case MachO::BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: 3594 Flags = ImmValue; 3595 SymStart = Ptr; 3596 while (*Ptr && (Ptr < Opcodes.end())) { 3597 ++Ptr; 3598 } 3599 if (Ptr == Opcodes.end()) { 3600 *E = malformedError( 3601 "for BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM " 3602 "symbol name extends past opcodes for opcode at: 0x" + 3603 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3604 moveToEnd(); 3605 return; 3606 } 3607 SymbolName = StringRef(reinterpret_cast<const char*>(SymStart), 3608 Ptr-SymStart); 3609 ++Ptr; 3610 DEBUG_WITH_TYPE( 3611 "mach-o-bind", 3612 dbgs() << "BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM: " 3613 << "SymbolName=" << SymbolName << "\n"); 3614 if (TableKind == Kind::Weak) { 3615 if (ImmValue & MachO::BIND_SYMBOL_FLAGS_NON_WEAK_DEFINITION) 3616 return; 3617 } 3618 break; 3619 case MachO::BIND_OPCODE_SET_TYPE_IMM: 3620 BindType = ImmValue; 3621 if (ImmValue > MachO::BIND_TYPE_TEXT_PCREL32) { 3622 *E = malformedError("for BIND_OPCODE_SET_TYPE_IMM bad bind type: " + 3623 Twine((int)ImmValue) + " for opcode at: 0x" + 3624 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3625 moveToEnd(); 3626 return; 3627 } 3628 DEBUG_WITH_TYPE( 3629 "mach-o-bind", 3630 dbgs() << "BIND_OPCODE_SET_TYPE_IMM: " 3631 << "BindType=" << (int)BindType << "\n"); 3632 break; 3633 case MachO::BIND_OPCODE_SET_ADDEND_SLEB: 3634 Addend = readSLEB128(&error); 3635 if (error) { 3636 *E = malformedError("for BIND_OPCODE_SET_ADDEND_SLEB " + Twine(error) + 3637 " for opcode at: 0x" + 3638 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3639 moveToEnd(); 3640 return; 3641 } 3642 DEBUG_WITH_TYPE( 3643 "mach-o-bind", 3644 dbgs() << "BIND_OPCODE_SET_ADDEND_SLEB: " 3645 << "Addend=" << Addend << "\n"); 3646 break; 3647 case MachO::BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: 3648 SegmentIndex = ImmValue; 3649 SegmentOffset = readULEB128(&error); 3650 if (error) { 3651 *E = malformedError("for BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " + 3652 Twine(error) + " for opcode at: 0x" + 3653 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3654 moveToEnd(); 3655 return; 3656 } 3657 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3658 PointerSize); 3659 if (error) { 3660 *E = malformedError("for BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB " + 3661 Twine(error) + " for opcode at: 0x" + 3662 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3663 moveToEnd(); 3664 return; 3665 } 3666 DEBUG_WITH_TYPE( 3667 "mach-o-bind", 3668 dbgs() << "BIND_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB: " 3669 << "SegmentIndex=" << SegmentIndex << ", " 3670 << format("SegmentOffset=0x%06X", SegmentOffset) 3671 << "\n"); 3672 break; 3673 case MachO::BIND_OPCODE_ADD_ADDR_ULEB: 3674 SegmentOffset += readULEB128(&error); 3675 if (error) { 3676 *E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB " + Twine(error) + 3677 " for opcode at: 0x" + 3678 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3679 moveToEnd(); 3680 return; 3681 } 3682 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3683 PointerSize); 3684 if (error) { 3685 *E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB " + Twine(error) + 3686 " for opcode at: 0x" + 3687 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3688 moveToEnd(); 3689 return; 3690 } 3691 DEBUG_WITH_TYPE("mach-o-bind", 3692 dbgs() << "BIND_OPCODE_ADD_ADDR_ULEB: " 3693 << format("SegmentOffset=0x%06X", 3694 SegmentOffset) << "\n"); 3695 break; 3696 case MachO::BIND_OPCODE_DO_BIND: 3697 AdvanceAmount = PointerSize; 3698 RemainingLoopCount = 0; 3699 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3700 PointerSize); 3701 if (error) { 3702 *E = malformedError("for BIND_OPCODE_DO_BIND " + Twine(error) + 3703 " for opcode at: 0x" + 3704 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3705 moveToEnd(); 3706 return; 3707 } 3708 if (SymbolName == StringRef()) { 3709 *E = malformedError( 3710 "for BIND_OPCODE_DO_BIND missing preceding " 3711 "BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for opcode at: 0x" + 3712 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3713 moveToEnd(); 3714 return; 3715 } 3716 if (!LibraryOrdinalSet && TableKind != Kind::Weak) { 3717 *E = 3718 malformedError("for BIND_OPCODE_DO_BIND missing preceding " 3719 "BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode at: 0x" + 3720 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3721 moveToEnd(); 3722 return; 3723 } 3724 DEBUG_WITH_TYPE("mach-o-bind", 3725 dbgs() << "BIND_OPCODE_DO_BIND: " 3726 << format("SegmentOffset=0x%06X", 3727 SegmentOffset) << "\n"); 3728 return; 3729 case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: 3730 if (TableKind == Kind::Lazy) { 3731 *E = malformedError("BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB not allowed in " 3732 "lazy bind table for opcode at: 0x" + 3733 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3734 moveToEnd(); 3735 return; 3736 } 3737 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3738 PointerSize); 3739 if (error) { 3740 *E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB " + 3741 Twine(error) + " for opcode at: 0x" + 3742 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3743 moveToEnd(); 3744 return; 3745 } 3746 if (SymbolName == StringRef()) { 3747 *E = malformedError( 3748 "for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing " 3749 "preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for opcode " 3750 "at: 0x" + 3751 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3752 moveToEnd(); 3753 return; 3754 } 3755 if (!LibraryOrdinalSet && TableKind != Kind::Weak) { 3756 *E = malformedError( 3757 "for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB missing " 3758 "preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode at: 0x" + 3759 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3760 moveToEnd(); 3761 return; 3762 } 3763 AdvanceAmount = readULEB128(&error) + PointerSize; 3764 if (error) { 3765 *E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB " + 3766 Twine(error) + " for opcode at: 0x" + 3767 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3768 moveToEnd(); 3769 return; 3770 } 3771 // Note, this is not really an error until the next bind but make no sense 3772 // for a BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB to not be followed by another 3773 // bind operation. 3774 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset + 3775 AdvanceAmount, PointerSize); 3776 if (error) { 3777 *E = malformedError("for BIND_OPCODE_ADD_ADDR_ULEB (after adding " 3778 "ULEB) " + 3779 Twine(error) + " for opcode at: 0x" + 3780 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3781 moveToEnd(); 3782 return; 3783 } 3784 RemainingLoopCount = 0; 3785 DEBUG_WITH_TYPE( 3786 "mach-o-bind", 3787 dbgs() << "BIND_OPCODE_DO_BIND_ADD_ADDR_ULEB: " 3788 << format("SegmentOffset=0x%06X", SegmentOffset) 3789 << ", AdvanceAmount=" << AdvanceAmount 3790 << ", RemainingLoopCount=" << RemainingLoopCount 3791 << "\n"); 3792 return; 3793 case MachO::BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: 3794 if (TableKind == Kind::Lazy) { 3795 *E = malformedError("BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED not " 3796 "allowed in lazy bind table for opcode at: 0x" + 3797 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3798 moveToEnd(); 3799 return; 3800 } 3801 if (SymbolName == StringRef()) { 3802 *E = malformedError( 3803 "for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " 3804 "missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for " 3805 "opcode at: 0x" + 3806 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3807 moveToEnd(); 3808 return; 3809 } 3810 if (!LibraryOrdinalSet && TableKind != Kind::Weak) { 3811 *E = malformedError( 3812 "for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " 3813 "missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode " 3814 "at: 0x" + 3815 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3816 moveToEnd(); 3817 return; 3818 } 3819 AdvanceAmount = ImmValue * PointerSize + PointerSize; 3820 RemainingLoopCount = 0; 3821 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset + 3822 AdvanceAmount, PointerSize); 3823 if (error) { 3824 *E = malformedError("for BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED " + 3825 Twine(error) + " for opcode at: 0x" + 3826 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3827 moveToEnd(); 3828 return; 3829 } 3830 DEBUG_WITH_TYPE("mach-o-bind", 3831 dbgs() 3832 << "BIND_OPCODE_DO_BIND_ADD_ADDR_IMM_SCALED: " 3833 << format("SegmentOffset=0x%06X", SegmentOffset) << "\n"); 3834 return; 3835 case MachO::BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: 3836 if (TableKind == Kind::Lazy) { 3837 *E = malformedError("BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB not " 3838 "allowed in lazy bind table for opcode at: 0x" + 3839 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3840 moveToEnd(); 3841 return; 3842 } 3843 Count = readULEB128(&error); 3844 if (Count != 0) 3845 RemainingLoopCount = Count - 1; 3846 else 3847 RemainingLoopCount = 0; 3848 if (error) { 3849 *E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB " 3850 " (count value) " + 3851 Twine(error) + " for opcode at: 0x" + 3852 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3853 moveToEnd(); 3854 return; 3855 } 3856 Skip = readULEB128(&error); 3857 AdvanceAmount = Skip + PointerSize; 3858 if (error) { 3859 *E = malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB " 3860 " (skip value) " + 3861 Twine(error) + " for opcode at: 0x" + 3862 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3863 moveToEnd(); 3864 return; 3865 } 3866 if (SymbolName == StringRef()) { 3867 *E = malformedError( 3868 "for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB " 3869 "missing preceding BIND_OPCODE_SET_SYMBOL_TRAILING_FLAGS_IMM for " 3870 "opcode at: 0x" + 3871 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3872 moveToEnd(); 3873 return; 3874 } 3875 if (!LibraryOrdinalSet && TableKind != Kind::Weak) { 3876 *E = malformedError( 3877 "for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB " 3878 "missing preceding BIND_OPCODE_SET_DYLIB_ORDINAL_* for opcode " 3879 "at: 0x" + 3880 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3881 moveToEnd(); 3882 return; 3883 } 3884 error = O->BindEntryCheckSegAndOffsets(SegmentIndex, SegmentOffset, 3885 PointerSize, Count, Skip); 3886 if (error) { 3887 *E = 3888 malformedError("for BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB " + 3889 Twine(error) + " for opcode at: 0x" + 3890 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3891 moveToEnd(); 3892 return; 3893 } 3894 DEBUG_WITH_TYPE( 3895 "mach-o-bind", 3896 dbgs() << "BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB: " 3897 << format("SegmentOffset=0x%06X", SegmentOffset) 3898 << ", AdvanceAmount=" << AdvanceAmount 3899 << ", RemainingLoopCount=" << RemainingLoopCount 3900 << "\n"); 3901 return; 3902 default: 3903 *E = malformedError("bad bind info (bad opcode value 0x" + 3904 Twine::utohexstr(Opcode) + " for opcode at: 0x" + 3905 Twine::utohexstr(OpcodeStart - Opcodes.begin())); 3906 moveToEnd(); 3907 return; 3908 } 3909 } 3910 } 3911 3912 uint64_t MachOBindEntry::readULEB128(const char **error) { 3913 unsigned Count; 3914 uint64_t Result = decodeULEB128(Ptr, &Count, Opcodes.end(), error); 3915 Ptr += Count; 3916 if (Ptr > Opcodes.end()) 3917 Ptr = Opcodes.end(); 3918 return Result; 3919 } 3920 3921 int64_t MachOBindEntry::readSLEB128(const char **error) { 3922 unsigned Count; 3923 int64_t Result = decodeSLEB128(Ptr, &Count, Opcodes.end(), error); 3924 Ptr += Count; 3925 if (Ptr > Opcodes.end()) 3926 Ptr = Opcodes.end(); 3927 return Result; 3928 } 3929 3930 int32_t MachOBindEntry::segmentIndex() const { return SegmentIndex; } 3931 3932 uint64_t MachOBindEntry::segmentOffset() const { return SegmentOffset; } 3933 3934 StringRef MachOBindEntry::typeName() const { 3935 switch (BindType) { 3936 case MachO::BIND_TYPE_POINTER: 3937 return "pointer"; 3938 case MachO::BIND_TYPE_TEXT_ABSOLUTE32: 3939 return "text abs32"; 3940 case MachO::BIND_TYPE_TEXT_PCREL32: 3941 return "text rel32"; 3942 } 3943 return "unknown"; 3944 } 3945 3946 StringRef MachOBindEntry::symbolName() const { return SymbolName; } 3947 3948 int64_t MachOBindEntry::addend() const { return Addend; } 3949 3950 uint32_t MachOBindEntry::flags() const { return Flags; } 3951 3952 int MachOBindEntry::ordinal() const { return Ordinal; } 3953 3954 // For use with the SegIndex of a checked Mach-O Bind entry 3955 // to get the segment name. 3956 StringRef MachOBindEntry::segmentName() const { 3957 return O->BindRebaseSegmentName(SegmentIndex); 3958 } 3959 3960 // For use with a SegIndex,SegOffset pair from a checked Mach-O Bind entry 3961 // to get the section name. 3962 StringRef MachOBindEntry::sectionName() const { 3963 return O->BindRebaseSectionName(SegmentIndex, SegmentOffset); 3964 } 3965 3966 // For use with a SegIndex,SegOffset pair from a checked Mach-O Bind entry 3967 // to get the address. 3968 uint64_t MachOBindEntry::address() const { 3969 return O->BindRebaseAddress(SegmentIndex, SegmentOffset); 3970 } 3971 3972 bool MachOBindEntry::operator==(const MachOBindEntry &Other) const { 3973 #ifdef EXPENSIVE_CHECKS 3974 assert(Opcodes == Other.Opcodes && "compare iterators of different files"); 3975 #else 3976 assert(Opcodes.data() == Other.Opcodes.data() && "compare iterators of different files"); 3977 #endif 3978 return (Ptr == Other.Ptr) && 3979 (RemainingLoopCount == Other.RemainingLoopCount) && 3980 (Done == Other.Done); 3981 } 3982 3983 // Build table of sections so SegIndex/SegOffset pairs can be translated. 3984 BindRebaseSegInfo::BindRebaseSegInfo(const object::MachOObjectFile *Obj) { 3985 uint32_t CurSegIndex = Obj->hasPageZeroSegment() ? 1 : 0; 3986 StringRef CurSegName; 3987 uint64_t CurSegAddress; 3988 for (const SectionRef &Section : Obj->sections()) { 3989 SectionInfo Info; 3990 Expected<StringRef> NameOrErr = Section.getName(); 3991 if (!NameOrErr) 3992 consumeError(NameOrErr.takeError()); 3993 else 3994 Info.SectionName = *NameOrErr; 3995 Info.Address = Section.getAddress(); 3996 Info.Size = Section.getSize(); 3997 Info.SegmentName = 3998 Obj->getSectionFinalSegmentName(Section.getRawDataRefImpl()); 3999 if (!Info.SegmentName.equals(CurSegName)) { 4000 ++CurSegIndex; 4001 CurSegName = Info.SegmentName; 4002 CurSegAddress = Info.Address; 4003 } 4004 Info.SegmentIndex = CurSegIndex - 1; 4005 Info.OffsetInSegment = Info.Address - CurSegAddress; 4006 Info.SegmentStartAddress = CurSegAddress; 4007 Sections.push_back(Info); 4008 } 4009 MaxSegIndex = CurSegIndex; 4010 } 4011 4012 // For use with a SegIndex, SegOffset, and PointerSize triple in 4013 // MachOBindEntry::moveNext() to validate a MachOBindEntry or MachORebaseEntry. 4014 // 4015 // Given a SegIndex, SegOffset, and PointerSize, verify a valid section exists 4016 // that fully contains a pointer at that location. Multiple fixups in a bind 4017 // (such as with the BIND_OPCODE_DO_BIND_ULEB_TIMES_SKIPPING_ULEB opcode) can 4018 // be tested via the Count and Skip parameters. 4019 const char * BindRebaseSegInfo::checkSegAndOffsets(int32_t SegIndex, 4020 uint64_t SegOffset, 4021 uint8_t PointerSize, 4022 uint32_t Count, 4023 uint32_t Skip) { 4024 if (SegIndex == -1) 4025 return "missing preceding *_OPCODE_SET_SEGMENT_AND_OFFSET_ULEB"; 4026 if (SegIndex >= MaxSegIndex) 4027 return "bad segIndex (too large)"; 4028 for (uint32_t i = 0; i < Count; ++i) { 4029 uint32_t Start = SegOffset + i * (PointerSize + Skip); 4030 uint32_t End = Start + PointerSize; 4031 bool Found = false; 4032 for (const SectionInfo &SI : Sections) { 4033 if (SI.SegmentIndex != SegIndex) 4034 continue; 4035 if ((SI.OffsetInSegment<=Start) && (Start<(SI.OffsetInSegment+SI.Size))) { 4036 if (End <= SI.OffsetInSegment + SI.Size) { 4037 Found = true; 4038 break; 4039 } 4040 else 4041 return "bad offset, extends beyond section boundary"; 4042 } 4043 } 4044 if (!Found) 4045 return "bad offset, not in section"; 4046 } 4047 return nullptr; 4048 } 4049 4050 // For use with the SegIndex of a checked Mach-O Bind or Rebase entry 4051 // to get the segment name. 4052 StringRef BindRebaseSegInfo::segmentName(int32_t SegIndex) { 4053 for (const SectionInfo &SI : Sections) { 4054 if (SI.SegmentIndex == SegIndex) 4055 return SI.SegmentName; 4056 } 4057 llvm_unreachable("invalid SegIndex"); 4058 } 4059 4060 // For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase 4061 // to get the SectionInfo. 4062 const BindRebaseSegInfo::SectionInfo &BindRebaseSegInfo::findSection( 4063 int32_t SegIndex, uint64_t SegOffset) { 4064 for (const SectionInfo &SI : Sections) { 4065 if (SI.SegmentIndex != SegIndex) 4066 continue; 4067 if (SI.OffsetInSegment > SegOffset) 4068 continue; 4069 if (SegOffset >= (SI.OffsetInSegment + SI.Size)) 4070 continue; 4071 return SI; 4072 } 4073 llvm_unreachable("SegIndex and SegOffset not in any section"); 4074 } 4075 4076 // For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase 4077 // entry to get the section name. 4078 StringRef BindRebaseSegInfo::sectionName(int32_t SegIndex, 4079 uint64_t SegOffset) { 4080 return findSection(SegIndex, SegOffset).SectionName; 4081 } 4082 4083 // For use with a SegIndex,SegOffset pair from a checked Mach-O Bind or Rebase 4084 // entry to get the address. 4085 uint64_t BindRebaseSegInfo::address(uint32_t SegIndex, uint64_t OffsetInSeg) { 4086 const SectionInfo &SI = findSection(SegIndex, OffsetInSeg); 4087 return SI.SegmentStartAddress + OffsetInSeg; 4088 } 4089 4090 iterator_range<bind_iterator> 4091 MachOObjectFile::bindTable(Error &Err, MachOObjectFile *O, 4092 ArrayRef<uint8_t> Opcodes, bool is64, 4093 MachOBindEntry::Kind BKind) { 4094 if (O->BindRebaseSectionTable == nullptr) 4095 O->BindRebaseSectionTable = std::make_unique<BindRebaseSegInfo>(O); 4096 MachOBindEntry Start(&Err, O, Opcodes, is64, BKind); 4097 Start.moveToFirst(); 4098 4099 MachOBindEntry Finish(&Err, O, Opcodes, is64, BKind); 4100 Finish.moveToEnd(); 4101 4102 return make_range(bind_iterator(Start), bind_iterator(Finish)); 4103 } 4104 4105 iterator_range<bind_iterator> MachOObjectFile::bindTable(Error &Err) { 4106 return bindTable(Err, this, getDyldInfoBindOpcodes(), is64Bit(), 4107 MachOBindEntry::Kind::Regular); 4108 } 4109 4110 iterator_range<bind_iterator> MachOObjectFile::lazyBindTable(Error &Err) { 4111 return bindTable(Err, this, getDyldInfoLazyBindOpcodes(), is64Bit(), 4112 MachOBindEntry::Kind::Lazy); 4113 } 4114 4115 iterator_range<bind_iterator> MachOObjectFile::weakBindTable(Error &Err) { 4116 return bindTable(Err, this, getDyldInfoWeakBindOpcodes(), is64Bit(), 4117 MachOBindEntry::Kind::Weak); 4118 } 4119 4120 MachOObjectFile::load_command_iterator 4121 MachOObjectFile::begin_load_commands() const { 4122 return LoadCommands.begin(); 4123 } 4124 4125 MachOObjectFile::load_command_iterator 4126 MachOObjectFile::end_load_commands() const { 4127 return LoadCommands.end(); 4128 } 4129 4130 iterator_range<MachOObjectFile::load_command_iterator> 4131 MachOObjectFile::load_commands() const { 4132 return make_range(begin_load_commands(), end_load_commands()); 4133 } 4134 4135 StringRef 4136 MachOObjectFile::getSectionFinalSegmentName(DataRefImpl Sec) const { 4137 ArrayRef<char> Raw = getSectionRawFinalSegmentName(Sec); 4138 return parseSegmentOrSectionName(Raw.data()); 4139 } 4140 4141 ArrayRef<char> 4142 MachOObjectFile::getSectionRawName(DataRefImpl Sec) const { 4143 assert(Sec.d.a < Sections.size() && "Should have detected this earlier"); 4144 const section_base *Base = 4145 reinterpret_cast<const section_base *>(Sections[Sec.d.a]); 4146 return makeArrayRef(Base->sectname); 4147 } 4148 4149 ArrayRef<char> 4150 MachOObjectFile::getSectionRawFinalSegmentName(DataRefImpl Sec) const { 4151 assert(Sec.d.a < Sections.size() && "Should have detected this earlier"); 4152 const section_base *Base = 4153 reinterpret_cast<const section_base *>(Sections[Sec.d.a]); 4154 return makeArrayRef(Base->segname); 4155 } 4156 4157 bool 4158 MachOObjectFile::isRelocationScattered(const MachO::any_relocation_info &RE) 4159 const { 4160 if (getCPUType(*this) == MachO::CPU_TYPE_X86_64) 4161 return false; 4162 return getPlainRelocationAddress(RE) & MachO::R_SCATTERED; 4163 } 4164 4165 unsigned MachOObjectFile::getPlainRelocationSymbolNum( 4166 const MachO::any_relocation_info &RE) const { 4167 if (isLittleEndian()) 4168 return RE.r_word1 & 0xffffff; 4169 return RE.r_word1 >> 8; 4170 } 4171 4172 bool MachOObjectFile::getPlainRelocationExternal( 4173 const MachO::any_relocation_info &RE) const { 4174 if (isLittleEndian()) 4175 return (RE.r_word1 >> 27) & 1; 4176 return (RE.r_word1 >> 4) & 1; 4177 } 4178 4179 bool MachOObjectFile::getScatteredRelocationScattered( 4180 const MachO::any_relocation_info &RE) const { 4181 return RE.r_word0 >> 31; 4182 } 4183 4184 uint32_t MachOObjectFile::getScatteredRelocationValue( 4185 const MachO::any_relocation_info &RE) const { 4186 return RE.r_word1; 4187 } 4188 4189 uint32_t MachOObjectFile::getScatteredRelocationType( 4190 const MachO::any_relocation_info &RE) const { 4191 return (RE.r_word0 >> 24) & 0xf; 4192 } 4193 4194 unsigned MachOObjectFile::getAnyRelocationAddress( 4195 const MachO::any_relocation_info &RE) const { 4196 if (isRelocationScattered(RE)) 4197 return getScatteredRelocationAddress(RE); 4198 return getPlainRelocationAddress(RE); 4199 } 4200 4201 unsigned MachOObjectFile::getAnyRelocationPCRel( 4202 const MachO::any_relocation_info &RE) const { 4203 if (isRelocationScattered(RE)) 4204 return getScatteredRelocationPCRel(RE); 4205 return getPlainRelocationPCRel(*this, RE); 4206 } 4207 4208 unsigned MachOObjectFile::getAnyRelocationLength( 4209 const MachO::any_relocation_info &RE) const { 4210 if (isRelocationScattered(RE)) 4211 return getScatteredRelocationLength(RE); 4212 return getPlainRelocationLength(*this, RE); 4213 } 4214 4215 unsigned 4216 MachOObjectFile::getAnyRelocationType( 4217 const MachO::any_relocation_info &RE) const { 4218 if (isRelocationScattered(RE)) 4219 return getScatteredRelocationType(RE); 4220 return getPlainRelocationType(*this, RE); 4221 } 4222 4223 SectionRef 4224 MachOObjectFile::getAnyRelocationSection( 4225 const MachO::any_relocation_info &RE) const { 4226 if (isRelocationScattered(RE) || getPlainRelocationExternal(RE)) 4227 return *section_end(); 4228 unsigned SecNum = getPlainRelocationSymbolNum(RE); 4229 if (SecNum == MachO::R_ABS || SecNum > Sections.size()) 4230 return *section_end(); 4231 DataRefImpl DRI; 4232 DRI.d.a = SecNum - 1; 4233 return SectionRef(DRI, this); 4234 } 4235 4236 MachO::section MachOObjectFile::getSection(DataRefImpl DRI) const { 4237 assert(DRI.d.a < Sections.size() && "Should have detected this earlier"); 4238 return getStruct<MachO::section>(*this, Sections[DRI.d.a]); 4239 } 4240 4241 MachO::section_64 MachOObjectFile::getSection64(DataRefImpl DRI) const { 4242 assert(DRI.d.a < Sections.size() && "Should have detected this earlier"); 4243 return getStruct<MachO::section_64>(*this, Sections[DRI.d.a]); 4244 } 4245 4246 MachO::section MachOObjectFile::getSection(const LoadCommandInfo &L, 4247 unsigned Index) const { 4248 const char *Sec = getSectionPtr(*this, L, Index); 4249 return getStruct<MachO::section>(*this, Sec); 4250 } 4251 4252 MachO::section_64 MachOObjectFile::getSection64(const LoadCommandInfo &L, 4253 unsigned Index) const { 4254 const char *Sec = getSectionPtr(*this, L, Index); 4255 return getStruct<MachO::section_64>(*this, Sec); 4256 } 4257 4258 MachO::nlist 4259 MachOObjectFile::getSymbolTableEntry(DataRefImpl DRI) const { 4260 const char *P = reinterpret_cast<const char *>(DRI.p); 4261 return getStruct<MachO::nlist>(*this, P); 4262 } 4263 4264 MachO::nlist_64 4265 MachOObjectFile::getSymbol64TableEntry(DataRefImpl DRI) const { 4266 const char *P = reinterpret_cast<const char *>(DRI.p); 4267 return getStruct<MachO::nlist_64>(*this, P); 4268 } 4269 4270 MachO::linkedit_data_command 4271 MachOObjectFile::getLinkeditDataLoadCommand(const LoadCommandInfo &L) const { 4272 return getStruct<MachO::linkedit_data_command>(*this, L.Ptr); 4273 } 4274 4275 MachO::segment_command 4276 MachOObjectFile::getSegmentLoadCommand(const LoadCommandInfo &L) const { 4277 return getStruct<MachO::segment_command>(*this, L.Ptr); 4278 } 4279 4280 MachO::segment_command_64 4281 MachOObjectFile::getSegment64LoadCommand(const LoadCommandInfo &L) const { 4282 return getStruct<MachO::segment_command_64>(*this, L.Ptr); 4283 } 4284 4285 MachO::linker_option_command 4286 MachOObjectFile::getLinkerOptionLoadCommand(const LoadCommandInfo &L) const { 4287 return getStruct<MachO::linker_option_command>(*this, L.Ptr); 4288 } 4289 4290 MachO::version_min_command 4291 MachOObjectFile::getVersionMinLoadCommand(const LoadCommandInfo &L) const { 4292 return getStruct<MachO::version_min_command>(*this, L.Ptr); 4293 } 4294 4295 MachO::note_command 4296 MachOObjectFile::getNoteLoadCommand(const LoadCommandInfo &L) const { 4297 return getStruct<MachO::note_command>(*this, L.Ptr); 4298 } 4299 4300 MachO::build_version_command 4301 MachOObjectFile::getBuildVersionLoadCommand(const LoadCommandInfo &L) const { 4302 return getStruct<MachO::build_version_command>(*this, L.Ptr); 4303 } 4304 4305 MachO::build_tool_version 4306 MachOObjectFile::getBuildToolVersion(unsigned index) const { 4307 return getStruct<MachO::build_tool_version>(*this, BuildTools[index]); 4308 } 4309 4310 MachO::dylib_command 4311 MachOObjectFile::getDylibIDLoadCommand(const LoadCommandInfo &L) const { 4312 return getStruct<MachO::dylib_command>(*this, L.Ptr); 4313 } 4314 4315 MachO::dyld_info_command 4316 MachOObjectFile::getDyldInfoLoadCommand(const LoadCommandInfo &L) const { 4317 return getStruct<MachO::dyld_info_command>(*this, L.Ptr); 4318 } 4319 4320 MachO::dylinker_command 4321 MachOObjectFile::getDylinkerCommand(const LoadCommandInfo &L) const { 4322 return getStruct<MachO::dylinker_command>(*this, L.Ptr); 4323 } 4324 4325 MachO::uuid_command 4326 MachOObjectFile::getUuidCommand(const LoadCommandInfo &L) const { 4327 return getStruct<MachO::uuid_command>(*this, L.Ptr); 4328 } 4329 4330 MachO::rpath_command 4331 MachOObjectFile::getRpathCommand(const LoadCommandInfo &L) const { 4332 return getStruct<MachO::rpath_command>(*this, L.Ptr); 4333 } 4334 4335 MachO::source_version_command 4336 MachOObjectFile::getSourceVersionCommand(const LoadCommandInfo &L) const { 4337 return getStruct<MachO::source_version_command>(*this, L.Ptr); 4338 } 4339 4340 MachO::entry_point_command 4341 MachOObjectFile::getEntryPointCommand(const LoadCommandInfo &L) const { 4342 return getStruct<MachO::entry_point_command>(*this, L.Ptr); 4343 } 4344 4345 MachO::encryption_info_command 4346 MachOObjectFile::getEncryptionInfoCommand(const LoadCommandInfo &L) const { 4347 return getStruct<MachO::encryption_info_command>(*this, L.Ptr); 4348 } 4349 4350 MachO::encryption_info_command_64 4351 MachOObjectFile::getEncryptionInfoCommand64(const LoadCommandInfo &L) const { 4352 return getStruct<MachO::encryption_info_command_64>(*this, L.Ptr); 4353 } 4354 4355 MachO::sub_framework_command 4356 MachOObjectFile::getSubFrameworkCommand(const LoadCommandInfo &L) const { 4357 return getStruct<MachO::sub_framework_command>(*this, L.Ptr); 4358 } 4359 4360 MachO::sub_umbrella_command 4361 MachOObjectFile::getSubUmbrellaCommand(const LoadCommandInfo &L) const { 4362 return getStruct<MachO::sub_umbrella_command>(*this, L.Ptr); 4363 } 4364 4365 MachO::sub_library_command 4366 MachOObjectFile::getSubLibraryCommand(const LoadCommandInfo &L) const { 4367 return getStruct<MachO::sub_library_command>(*this, L.Ptr); 4368 } 4369 4370 MachO::sub_client_command 4371 MachOObjectFile::getSubClientCommand(const LoadCommandInfo &L) const { 4372 return getStruct<MachO::sub_client_command>(*this, L.Ptr); 4373 } 4374 4375 MachO::routines_command 4376 MachOObjectFile::getRoutinesCommand(const LoadCommandInfo &L) const { 4377 return getStruct<MachO::routines_command>(*this, L.Ptr); 4378 } 4379 4380 MachO::routines_command_64 4381 MachOObjectFile::getRoutinesCommand64(const LoadCommandInfo &L) const { 4382 return getStruct<MachO::routines_command_64>(*this, L.Ptr); 4383 } 4384 4385 MachO::thread_command 4386 MachOObjectFile::getThreadCommand(const LoadCommandInfo &L) const { 4387 return getStruct<MachO::thread_command>(*this, L.Ptr); 4388 } 4389 4390 MachO::any_relocation_info 4391 MachOObjectFile::getRelocation(DataRefImpl Rel) const { 4392 uint32_t Offset; 4393 if (getHeader().filetype == MachO::MH_OBJECT) { 4394 DataRefImpl Sec; 4395 Sec.d.a = Rel.d.a; 4396 if (is64Bit()) { 4397 MachO::section_64 Sect = getSection64(Sec); 4398 Offset = Sect.reloff; 4399 } else { 4400 MachO::section Sect = getSection(Sec); 4401 Offset = Sect.reloff; 4402 } 4403 } else { 4404 MachO::dysymtab_command DysymtabLoadCmd = getDysymtabLoadCommand(); 4405 if (Rel.d.a == 0) 4406 Offset = DysymtabLoadCmd.extreloff; // Offset to the external relocations 4407 else 4408 Offset = DysymtabLoadCmd.locreloff; // Offset to the local relocations 4409 } 4410 4411 auto P = reinterpret_cast<const MachO::any_relocation_info *>( 4412 getPtr(*this, Offset)) + Rel.d.b; 4413 return getStruct<MachO::any_relocation_info>( 4414 *this, reinterpret_cast<const char *>(P)); 4415 } 4416 4417 MachO::data_in_code_entry 4418 MachOObjectFile::getDice(DataRefImpl Rel) const { 4419 const char *P = reinterpret_cast<const char *>(Rel.p); 4420 return getStruct<MachO::data_in_code_entry>(*this, P); 4421 } 4422 4423 const MachO::mach_header &MachOObjectFile::getHeader() const { 4424 return Header; 4425 } 4426 4427 const MachO::mach_header_64 &MachOObjectFile::getHeader64() const { 4428 assert(is64Bit()); 4429 return Header64; 4430 } 4431 4432 uint32_t MachOObjectFile::getIndirectSymbolTableEntry( 4433 const MachO::dysymtab_command &DLC, 4434 unsigned Index) const { 4435 uint64_t Offset = DLC.indirectsymoff + Index * sizeof(uint32_t); 4436 return getStruct<uint32_t>(*this, getPtr(*this, Offset)); 4437 } 4438 4439 MachO::data_in_code_entry 4440 MachOObjectFile::getDataInCodeTableEntry(uint32_t DataOffset, 4441 unsigned Index) const { 4442 uint64_t Offset = DataOffset + Index * sizeof(MachO::data_in_code_entry); 4443 return getStruct<MachO::data_in_code_entry>(*this, getPtr(*this, Offset)); 4444 } 4445 4446 MachO::symtab_command MachOObjectFile::getSymtabLoadCommand() const { 4447 if (SymtabLoadCmd) 4448 return getStruct<MachO::symtab_command>(*this, SymtabLoadCmd); 4449 4450 // If there is no SymtabLoadCmd return a load command with zero'ed fields. 4451 MachO::symtab_command Cmd; 4452 Cmd.cmd = MachO::LC_SYMTAB; 4453 Cmd.cmdsize = sizeof(MachO::symtab_command); 4454 Cmd.symoff = 0; 4455 Cmd.nsyms = 0; 4456 Cmd.stroff = 0; 4457 Cmd.strsize = 0; 4458 return Cmd; 4459 } 4460 4461 MachO::dysymtab_command MachOObjectFile::getDysymtabLoadCommand() const { 4462 if (DysymtabLoadCmd) 4463 return getStruct<MachO::dysymtab_command>(*this, DysymtabLoadCmd); 4464 4465 // If there is no DysymtabLoadCmd return a load command with zero'ed fields. 4466 MachO::dysymtab_command Cmd; 4467 Cmd.cmd = MachO::LC_DYSYMTAB; 4468 Cmd.cmdsize = sizeof(MachO::dysymtab_command); 4469 Cmd.ilocalsym = 0; 4470 Cmd.nlocalsym = 0; 4471 Cmd.iextdefsym = 0; 4472 Cmd.nextdefsym = 0; 4473 Cmd.iundefsym = 0; 4474 Cmd.nundefsym = 0; 4475 Cmd.tocoff = 0; 4476 Cmd.ntoc = 0; 4477 Cmd.modtaboff = 0; 4478 Cmd.nmodtab = 0; 4479 Cmd.extrefsymoff = 0; 4480 Cmd.nextrefsyms = 0; 4481 Cmd.indirectsymoff = 0; 4482 Cmd.nindirectsyms = 0; 4483 Cmd.extreloff = 0; 4484 Cmd.nextrel = 0; 4485 Cmd.locreloff = 0; 4486 Cmd.nlocrel = 0; 4487 return Cmd; 4488 } 4489 4490 MachO::linkedit_data_command 4491 MachOObjectFile::getDataInCodeLoadCommand() const { 4492 if (DataInCodeLoadCmd) 4493 return getStruct<MachO::linkedit_data_command>(*this, DataInCodeLoadCmd); 4494 4495 // If there is no DataInCodeLoadCmd return a load command with zero'ed fields. 4496 MachO::linkedit_data_command Cmd; 4497 Cmd.cmd = MachO::LC_DATA_IN_CODE; 4498 Cmd.cmdsize = sizeof(MachO::linkedit_data_command); 4499 Cmd.dataoff = 0; 4500 Cmd.datasize = 0; 4501 return Cmd; 4502 } 4503 4504 MachO::linkedit_data_command 4505 MachOObjectFile::getLinkOptHintsLoadCommand() const { 4506 if (LinkOptHintsLoadCmd) 4507 return getStruct<MachO::linkedit_data_command>(*this, LinkOptHintsLoadCmd); 4508 4509 // If there is no LinkOptHintsLoadCmd return a load command with zero'ed 4510 // fields. 4511 MachO::linkedit_data_command Cmd; 4512 Cmd.cmd = MachO::LC_LINKER_OPTIMIZATION_HINT; 4513 Cmd.cmdsize = sizeof(MachO::linkedit_data_command); 4514 Cmd.dataoff = 0; 4515 Cmd.datasize = 0; 4516 return Cmd; 4517 } 4518 4519 ArrayRef<uint8_t> MachOObjectFile::getDyldInfoRebaseOpcodes() const { 4520 if (!DyldInfoLoadCmd) 4521 return None; 4522 4523 auto DyldInfoOrErr = 4524 getStructOrErr<MachO::dyld_info_command>(*this, DyldInfoLoadCmd); 4525 if (!DyldInfoOrErr) 4526 return None; 4527 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 4528 const uint8_t *Ptr = 4529 reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.rebase_off)); 4530 return makeArrayRef(Ptr, DyldInfo.rebase_size); 4531 } 4532 4533 ArrayRef<uint8_t> MachOObjectFile::getDyldInfoBindOpcodes() const { 4534 if (!DyldInfoLoadCmd) 4535 return None; 4536 4537 auto DyldInfoOrErr = 4538 getStructOrErr<MachO::dyld_info_command>(*this, DyldInfoLoadCmd); 4539 if (!DyldInfoOrErr) 4540 return None; 4541 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 4542 const uint8_t *Ptr = 4543 reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.bind_off)); 4544 return makeArrayRef(Ptr, DyldInfo.bind_size); 4545 } 4546 4547 ArrayRef<uint8_t> MachOObjectFile::getDyldInfoWeakBindOpcodes() const { 4548 if (!DyldInfoLoadCmd) 4549 return None; 4550 4551 auto DyldInfoOrErr = 4552 getStructOrErr<MachO::dyld_info_command>(*this, DyldInfoLoadCmd); 4553 if (!DyldInfoOrErr) 4554 return None; 4555 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 4556 const uint8_t *Ptr = 4557 reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.weak_bind_off)); 4558 return makeArrayRef(Ptr, DyldInfo.weak_bind_size); 4559 } 4560 4561 ArrayRef<uint8_t> MachOObjectFile::getDyldInfoLazyBindOpcodes() const { 4562 if (!DyldInfoLoadCmd) 4563 return None; 4564 4565 auto DyldInfoOrErr = 4566 getStructOrErr<MachO::dyld_info_command>(*this, DyldInfoLoadCmd); 4567 if (!DyldInfoOrErr) 4568 return None; 4569 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 4570 const uint8_t *Ptr = 4571 reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.lazy_bind_off)); 4572 return makeArrayRef(Ptr, DyldInfo.lazy_bind_size); 4573 } 4574 4575 ArrayRef<uint8_t> MachOObjectFile::getDyldInfoExportsTrie() const { 4576 if (!DyldInfoLoadCmd) 4577 return None; 4578 4579 auto DyldInfoOrErr = 4580 getStructOrErr<MachO::dyld_info_command>(*this, DyldInfoLoadCmd); 4581 if (!DyldInfoOrErr) 4582 return None; 4583 MachO::dyld_info_command DyldInfo = DyldInfoOrErr.get(); 4584 const uint8_t *Ptr = 4585 reinterpret_cast<const uint8_t *>(getPtr(*this, DyldInfo.export_off)); 4586 return makeArrayRef(Ptr, DyldInfo.export_size); 4587 } 4588 4589 ArrayRef<uint8_t> MachOObjectFile::getUuid() const { 4590 if (!UuidLoadCmd) 4591 return None; 4592 // Returning a pointer is fine as uuid doesn't need endian swapping. 4593 const char *Ptr = UuidLoadCmd + offsetof(MachO::uuid_command, uuid); 4594 return makeArrayRef(reinterpret_cast<const uint8_t *>(Ptr), 16); 4595 } 4596 4597 StringRef MachOObjectFile::getStringTableData() const { 4598 MachO::symtab_command S = getSymtabLoadCommand(); 4599 return getData().substr(S.stroff, S.strsize); 4600 } 4601 4602 bool MachOObjectFile::is64Bit() const { 4603 return getType() == getMachOType(false, true) || 4604 getType() == getMachOType(true, true); 4605 } 4606 4607 void MachOObjectFile::ReadULEB128s(uint64_t Index, 4608 SmallVectorImpl<uint64_t> &Out) const { 4609 DataExtractor extractor(ObjectFile::getData(), true, 0); 4610 4611 uint64_t offset = Index; 4612 uint64_t data = 0; 4613 while (uint64_t delta = extractor.getULEB128(&offset)) { 4614 data += delta; 4615 Out.push_back(data); 4616 } 4617 } 4618 4619 bool MachOObjectFile::isRelocatableObject() const { 4620 return getHeader().filetype == MachO::MH_OBJECT; 4621 } 4622 4623 Expected<std::unique_ptr<MachOObjectFile>> 4624 ObjectFile::createMachOObjectFile(MemoryBufferRef Buffer, 4625 uint32_t UniversalCputype, 4626 uint32_t UniversalIndex) { 4627 StringRef Magic = Buffer.getBuffer().slice(0, 4); 4628 if (Magic == "\xFE\xED\xFA\xCE") 4629 return MachOObjectFile::create(Buffer, false, false, 4630 UniversalCputype, UniversalIndex); 4631 if (Magic == "\xCE\xFA\xED\xFE") 4632 return MachOObjectFile::create(Buffer, true, false, 4633 UniversalCputype, UniversalIndex); 4634 if (Magic == "\xFE\xED\xFA\xCF") 4635 return MachOObjectFile::create(Buffer, false, true, 4636 UniversalCputype, UniversalIndex); 4637 if (Magic == "\xCF\xFA\xED\xFE") 4638 return MachOObjectFile::create(Buffer, true, true, 4639 UniversalCputype, UniversalIndex); 4640 return make_error<GenericBinaryError>("Unrecognized MachO magic number", 4641 object_error::invalid_file_type); 4642 } 4643 4644 StringRef MachOObjectFile::mapDebugSectionName(StringRef Name) const { 4645 return StringSwitch<StringRef>(Name) 4646 .Case("debug_str_offs", "debug_str_offsets") 4647 .Default(Name); 4648 } 4649