1 //===-- ObjectFileELF.cpp ------------------------------------- -*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "ObjectFileELF.h" 11 12 #include <cassert> 13 #include <algorithm> 14 15 #include "lldb/Core/ArchSpec.h" 16 #include "lldb/Core/DataBuffer.h" 17 #include "lldb/Core/Error.h" 18 #include "lldb/Core/FileSpecList.h" 19 #include "lldb/Core/Log.h" 20 #include "lldb/Core/Module.h" 21 #include "lldb/Core/ModuleSpec.h" 22 #include "lldb/Core/PluginManager.h" 23 #include "lldb/Core/Section.h" 24 #include "lldb/Core/Stream.h" 25 #include "lldb/Core/Timer.h" 26 #include "lldb/Symbol/DWARFCallFrameInfo.h" 27 #include "lldb/Symbol/SymbolContext.h" 28 #include "lldb/Target/SectionLoadList.h" 29 #include "lldb/Target/Target.h" 30 31 #include "llvm/ADT/PointerUnion.h" 32 #include "llvm/ADT/StringRef.h" 33 #include "llvm/Support/MathExtras.h" 34 35 #define CASE_AND_STREAM(s, def, width) \ 36 case def: s->Printf("%-*s", width, #def); break; 37 38 using namespace lldb; 39 using namespace lldb_private; 40 using namespace elf; 41 using namespace llvm::ELF; 42 43 namespace { 44 45 // ELF note owner definitions 46 const char *const LLDB_NT_OWNER_FREEBSD = "FreeBSD"; 47 const char *const LLDB_NT_OWNER_GNU = "GNU"; 48 const char *const LLDB_NT_OWNER_NETBSD = "NetBSD"; 49 const char *const LLDB_NT_OWNER_CSR = "csr"; 50 const char *const LLDB_NT_OWNER_ANDROID = "Android"; 51 52 // ELF note type definitions 53 const elf_word LLDB_NT_FREEBSD_ABI_TAG = 0x01; 54 const elf_word LLDB_NT_FREEBSD_ABI_SIZE = 4; 55 56 const elf_word LLDB_NT_GNU_ABI_TAG = 0x01; 57 const elf_word LLDB_NT_GNU_ABI_SIZE = 16; 58 59 const elf_word LLDB_NT_GNU_BUILD_ID_TAG = 0x03; 60 61 const elf_word LLDB_NT_NETBSD_ABI_TAG = 0x01; 62 const elf_word LLDB_NT_NETBSD_ABI_SIZE = 4; 63 64 // GNU ABI note OS constants 65 const elf_word LLDB_NT_GNU_ABI_OS_LINUX = 0x00; 66 const elf_word LLDB_NT_GNU_ABI_OS_HURD = 0x01; 67 const elf_word LLDB_NT_GNU_ABI_OS_SOLARIS = 0x02; 68 69 //===----------------------------------------------------------------------===// 70 /// @class ELFRelocation 71 /// @brief Generic wrapper for ELFRel and ELFRela. 72 /// 73 /// This helper class allows us to parse both ELFRel and ELFRela relocation 74 /// entries in a generic manner. 75 class ELFRelocation 76 { 77 public: 78 79 /// Constructs an ELFRelocation entry with a personality as given by @p 80 /// type. 81 /// 82 /// @param type Either DT_REL or DT_RELA. Any other value is invalid. 83 ELFRelocation(unsigned type); 84 85 ~ELFRelocation(); 86 87 bool 88 Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset); 89 90 static unsigned 91 RelocType32(const ELFRelocation &rel); 92 93 static unsigned 94 RelocType64(const ELFRelocation &rel); 95 96 static unsigned 97 RelocSymbol32(const ELFRelocation &rel); 98 99 static unsigned 100 RelocSymbol64(const ELFRelocation &rel); 101 102 static unsigned 103 RelocOffset32(const ELFRelocation &rel); 104 105 static unsigned 106 RelocOffset64(const ELFRelocation &rel); 107 108 static unsigned 109 RelocAddend32(const ELFRelocation &rel); 110 111 static unsigned 112 RelocAddend64(const ELFRelocation &rel); 113 114 private: 115 typedef llvm::PointerUnion<ELFRel*, ELFRela*> RelocUnion; 116 117 RelocUnion reloc; 118 }; 119 120 ELFRelocation::ELFRelocation(unsigned type) 121 { 122 if (type == DT_REL || type == SHT_REL) 123 reloc = new ELFRel(); 124 else if (type == DT_RELA || type == SHT_RELA) 125 reloc = new ELFRela(); 126 else { 127 assert(false && "unexpected relocation type"); 128 reloc = static_cast<ELFRel*>(NULL); 129 } 130 } 131 132 ELFRelocation::~ELFRelocation() 133 { 134 if (reloc.is<ELFRel*>()) 135 delete reloc.get<ELFRel*>(); 136 else 137 delete reloc.get<ELFRela*>(); 138 } 139 140 bool 141 ELFRelocation::Parse(const lldb_private::DataExtractor &data, lldb::offset_t *offset) 142 { 143 if (reloc.is<ELFRel*>()) 144 return reloc.get<ELFRel*>()->Parse(data, offset); 145 else 146 return reloc.get<ELFRela*>()->Parse(data, offset); 147 } 148 149 unsigned 150 ELFRelocation::RelocType32(const ELFRelocation &rel) 151 { 152 if (rel.reloc.is<ELFRel*>()) 153 return ELFRel::RelocType32(*rel.reloc.get<ELFRel*>()); 154 else 155 return ELFRela::RelocType32(*rel.reloc.get<ELFRela*>()); 156 } 157 158 unsigned 159 ELFRelocation::RelocType64(const ELFRelocation &rel) 160 { 161 if (rel.reloc.is<ELFRel*>()) 162 return ELFRel::RelocType64(*rel.reloc.get<ELFRel*>()); 163 else 164 return ELFRela::RelocType64(*rel.reloc.get<ELFRela*>()); 165 } 166 167 unsigned 168 ELFRelocation::RelocSymbol32(const ELFRelocation &rel) 169 { 170 if (rel.reloc.is<ELFRel*>()) 171 return ELFRel::RelocSymbol32(*rel.reloc.get<ELFRel*>()); 172 else 173 return ELFRela::RelocSymbol32(*rel.reloc.get<ELFRela*>()); 174 } 175 176 unsigned 177 ELFRelocation::RelocSymbol64(const ELFRelocation &rel) 178 { 179 if (rel.reloc.is<ELFRel*>()) 180 return ELFRel::RelocSymbol64(*rel.reloc.get<ELFRel*>()); 181 else 182 return ELFRela::RelocSymbol64(*rel.reloc.get<ELFRela*>()); 183 } 184 185 unsigned 186 ELFRelocation::RelocOffset32(const ELFRelocation &rel) 187 { 188 if (rel.reloc.is<ELFRel*>()) 189 return rel.reloc.get<ELFRel*>()->r_offset; 190 else 191 return rel.reloc.get<ELFRela*>()->r_offset; 192 } 193 194 unsigned 195 ELFRelocation::RelocOffset64(const ELFRelocation &rel) 196 { 197 if (rel.reloc.is<ELFRel*>()) 198 return rel.reloc.get<ELFRel*>()->r_offset; 199 else 200 return rel.reloc.get<ELFRela*>()->r_offset; 201 } 202 203 unsigned 204 ELFRelocation::RelocAddend32(const ELFRelocation &rel) 205 { 206 if (rel.reloc.is<ELFRel*>()) 207 return 0; 208 else 209 return rel.reloc.get<ELFRela*>()->r_addend; 210 } 211 212 unsigned 213 ELFRelocation::RelocAddend64(const ELFRelocation &rel) 214 { 215 if (rel.reloc.is<ELFRel*>()) 216 return 0; 217 else 218 return rel.reloc.get<ELFRela*>()->r_addend; 219 } 220 221 } // end anonymous namespace 222 223 bool 224 ELFNote::Parse(const DataExtractor &data, lldb::offset_t *offset) 225 { 226 // Read all fields. 227 if (data.GetU32(offset, &n_namesz, 3) == NULL) 228 return false; 229 230 // The name field is required to be nul-terminated, and n_namesz 231 // includes the terminating nul in observed implementations (contrary 232 // to the ELF-64 spec). A special case is needed for cores generated 233 // by some older Linux versions, which write a note named "CORE" 234 // without a nul terminator and n_namesz = 4. 235 if (n_namesz == 4) 236 { 237 char buf[4]; 238 if (data.ExtractBytes (*offset, 4, data.GetByteOrder(), buf) != 4) 239 return false; 240 if (strncmp (buf, "CORE", 4) == 0) 241 { 242 n_name = "CORE"; 243 *offset += 4; 244 return true; 245 } 246 } 247 248 const char *cstr = data.GetCStr(offset, llvm::RoundUpToAlignment (n_namesz, 4)); 249 if (cstr == NULL) 250 { 251 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_SYMBOLS)); 252 if (log) 253 log->Printf("Failed to parse note name lacking nul terminator"); 254 255 return false; 256 } 257 n_name = cstr; 258 return true; 259 } 260 261 static uint32_t 262 kalimbaVariantFromElfFlags(const elf::elf_word e_flags) 263 { 264 const uint32_t dsp_rev = e_flags & 0xFF; 265 uint32_t kal_arch_variant = LLDB_INVALID_CPUTYPE; 266 switch(dsp_rev) 267 { 268 // TODO(mg11) Support more variants 269 case 10: 270 kal_arch_variant = llvm::Triple::KalimbaSubArch_v3; 271 break; 272 case 14: 273 kal_arch_variant = llvm::Triple::KalimbaSubArch_v4; 274 break; 275 case 17: 276 case 20: 277 kal_arch_variant = llvm::Triple::KalimbaSubArch_v5; 278 break; 279 default: 280 break; 281 } 282 return kal_arch_variant; 283 } 284 285 static uint32_t 286 mipsVariantFromElfFlags(const elf::elf_word e_flags, uint32_t endian) 287 { 288 const uint32_t mips_arch = e_flags & llvm::ELF::EF_MIPS_ARCH; 289 uint32_t arch_variant = ArchSpec::eMIPSSubType_unknown; 290 291 switch (mips_arch) 292 { 293 case llvm::ELF::EF_MIPS_ARCH_32: 294 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips32el : ArchSpec::eMIPSSubType_mips32; 295 case llvm::ELF::EF_MIPS_ARCH_32R2: 296 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips32r2el : ArchSpec::eMIPSSubType_mips32r2; 297 case llvm::ELF::EF_MIPS_ARCH_32R6: 298 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips32r6el : ArchSpec::eMIPSSubType_mips32r6; 299 case llvm::ELF::EF_MIPS_ARCH_64: 300 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips64el : ArchSpec::eMIPSSubType_mips64; 301 case llvm::ELF::EF_MIPS_ARCH_64R2: 302 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips64r2el : ArchSpec::eMIPSSubType_mips64r2; 303 case llvm::ELF::EF_MIPS_ARCH_64R6: 304 return (endian == ELFDATA2LSB) ? ArchSpec::eMIPSSubType_mips64r6el : ArchSpec::eMIPSSubType_mips64r6; 305 default: 306 break; 307 } 308 309 return arch_variant; 310 } 311 312 static uint32_t 313 subTypeFromElfHeader(const elf::ELFHeader& header) 314 { 315 if (header.e_machine == llvm::ELF::EM_MIPS) 316 return mipsVariantFromElfFlags (header.e_flags, 317 header.e_ident[EI_DATA]); 318 319 return 320 llvm::ELF::EM_CSR_KALIMBA == header.e_machine ? 321 kalimbaVariantFromElfFlags(header.e_flags) : 322 LLDB_INVALID_CPUTYPE; 323 } 324 325 //! The kalimba toolchain identifies a code section as being 326 //! one with the SHT_PROGBITS set in the section sh_type and the top 327 //! bit in the 32-bit address field set. 328 static lldb::SectionType 329 kalimbaSectionType( 330 const elf::ELFHeader& header, 331 const elf::ELFSectionHeader& sect_hdr) 332 { 333 if (llvm::ELF::EM_CSR_KALIMBA != header.e_machine) 334 { 335 return eSectionTypeOther; 336 } 337 338 if (llvm::ELF::SHT_NOBITS == sect_hdr.sh_type) 339 { 340 return eSectionTypeZeroFill; 341 } 342 343 if (llvm::ELF::SHT_PROGBITS == sect_hdr.sh_type) 344 { 345 const lldb::addr_t KAL_CODE_BIT = 1 << 31; 346 return KAL_CODE_BIT & sect_hdr.sh_addr ? 347 eSectionTypeCode : eSectionTypeData; 348 } 349 350 return eSectionTypeOther; 351 } 352 353 // Arbitrary constant used as UUID prefix for core files. 354 const uint32_t 355 ObjectFileELF::g_core_uuid_magic(0xE210C); 356 357 //------------------------------------------------------------------ 358 // Static methods. 359 //------------------------------------------------------------------ 360 void 361 ObjectFileELF::Initialize() 362 { 363 PluginManager::RegisterPlugin(GetPluginNameStatic(), 364 GetPluginDescriptionStatic(), 365 CreateInstance, 366 CreateMemoryInstance, 367 GetModuleSpecifications); 368 } 369 370 void 371 ObjectFileELF::Terminate() 372 { 373 PluginManager::UnregisterPlugin(CreateInstance); 374 } 375 376 lldb_private::ConstString 377 ObjectFileELF::GetPluginNameStatic() 378 { 379 static ConstString g_name("elf"); 380 return g_name; 381 } 382 383 const char * 384 ObjectFileELF::GetPluginDescriptionStatic() 385 { 386 return "ELF object file reader."; 387 } 388 389 ObjectFile * 390 ObjectFileELF::CreateInstance (const lldb::ModuleSP &module_sp, 391 DataBufferSP &data_sp, 392 lldb::offset_t data_offset, 393 const lldb_private::FileSpec* file, 394 lldb::offset_t file_offset, 395 lldb::offset_t length) 396 { 397 if (!data_sp) 398 { 399 data_sp = file->MemoryMapFileContentsIfLocal(file_offset, length); 400 data_offset = 0; 401 } 402 403 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT + data_offset)) 404 { 405 const uint8_t *magic = data_sp->GetBytes() + data_offset; 406 if (ELFHeader::MagicBytesMatch(magic)) 407 { 408 // Update the data to contain the entire file if it doesn't already 409 if (data_sp->GetByteSize() < length) { 410 data_sp = file->MemoryMapFileContentsIfLocal(file_offset, length); 411 data_offset = 0; 412 magic = data_sp->GetBytes(); 413 } 414 unsigned address_size = ELFHeader::AddressSizeInBytes(magic); 415 if (address_size == 4 || address_size == 8) 416 { 417 std::unique_ptr<ObjectFileELF> objfile_ap(new ObjectFileELF(module_sp, data_sp, data_offset, file, file_offset, length)); 418 ArchSpec spec; 419 if (objfile_ap->GetArchitecture(spec) && 420 objfile_ap->SetModulesArchitecture(spec)) 421 return objfile_ap.release(); 422 } 423 } 424 } 425 return NULL; 426 } 427 428 429 ObjectFile* 430 ObjectFileELF::CreateMemoryInstance (const lldb::ModuleSP &module_sp, 431 DataBufferSP& data_sp, 432 const lldb::ProcessSP &process_sp, 433 lldb::addr_t header_addr) 434 { 435 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT)) 436 { 437 const uint8_t *magic = data_sp->GetBytes(); 438 if (ELFHeader::MagicBytesMatch(magic)) 439 { 440 unsigned address_size = ELFHeader::AddressSizeInBytes(magic); 441 if (address_size == 4 || address_size == 8) 442 { 443 std::auto_ptr<ObjectFileELF> objfile_ap(new ObjectFileELF(module_sp, data_sp, process_sp, header_addr)); 444 ArchSpec spec; 445 if (objfile_ap->GetArchitecture(spec) && 446 objfile_ap->SetModulesArchitecture(spec)) 447 return objfile_ap.release(); 448 } 449 } 450 } 451 return NULL; 452 } 453 454 bool 455 ObjectFileELF::MagicBytesMatch (DataBufferSP& data_sp, 456 lldb::addr_t data_offset, 457 lldb::addr_t data_length) 458 { 459 if (data_sp && data_sp->GetByteSize() > (llvm::ELF::EI_NIDENT + data_offset)) 460 { 461 const uint8_t *magic = data_sp->GetBytes() + data_offset; 462 return ELFHeader::MagicBytesMatch(magic); 463 } 464 return false; 465 } 466 467 /* 468 * crc function from http://svnweb.freebsd.org/base/head/sys/libkern/crc32.c 469 * 470 * COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or 471 * code or tables extracted from it, as desired without restriction. 472 */ 473 static uint32_t 474 calc_crc32(uint32_t crc, const void *buf, size_t size) 475 { 476 static const uint32_t g_crc32_tab[] = 477 { 478 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 479 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 480 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 481 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 482 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 483 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 484 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 485 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 486 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 487 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 488 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 489 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 490 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 491 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 492 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 493 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 494 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 495 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 496 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 497 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 498 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 499 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 500 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 501 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 502 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 503 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 504 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 505 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 506 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 507 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 508 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 509 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 510 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 511 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 512 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 513 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 514 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 515 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 516 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 517 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 518 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 519 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 520 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d 521 }; 522 const uint8_t *p = (const uint8_t *)buf; 523 524 crc = crc ^ ~0U; 525 while (size--) 526 crc = g_crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8); 527 return crc ^ ~0U; 528 } 529 530 static uint32_t 531 calc_gnu_debuglink_crc32(const void *buf, size_t size) 532 { 533 return calc_crc32(0U, buf, size); 534 } 535 536 uint32_t 537 ObjectFileELF::CalculateELFNotesSegmentsCRC32 (const ProgramHeaderColl& program_headers, 538 DataExtractor& object_data) 539 { 540 typedef ProgramHeaderCollConstIter Iter; 541 542 uint32_t core_notes_crc = 0; 543 544 for (Iter I = program_headers.begin(); I != program_headers.end(); ++I) 545 { 546 if (I->p_type == llvm::ELF::PT_NOTE) 547 { 548 const elf_off ph_offset = I->p_offset; 549 const size_t ph_size = I->p_filesz; 550 551 DataExtractor segment_data; 552 if (segment_data.SetData(object_data, ph_offset, ph_size) != ph_size) 553 { 554 // The ELF program header contained incorrect data, 555 // probably corefile is incomplete or corrupted. 556 break; 557 } 558 559 core_notes_crc = calc_crc32(core_notes_crc, 560 segment_data.GetDataStart(), 561 segment_data.GetByteSize()); 562 } 563 } 564 565 return core_notes_crc; 566 } 567 568 static const char* 569 OSABIAsCString (unsigned char osabi_byte) 570 { 571 #define _MAKE_OSABI_CASE(x) case x: return #x 572 switch (osabi_byte) 573 { 574 _MAKE_OSABI_CASE(ELFOSABI_NONE); 575 _MAKE_OSABI_CASE(ELFOSABI_HPUX); 576 _MAKE_OSABI_CASE(ELFOSABI_NETBSD); 577 _MAKE_OSABI_CASE(ELFOSABI_GNU); 578 _MAKE_OSABI_CASE(ELFOSABI_HURD); 579 _MAKE_OSABI_CASE(ELFOSABI_SOLARIS); 580 _MAKE_OSABI_CASE(ELFOSABI_AIX); 581 _MAKE_OSABI_CASE(ELFOSABI_IRIX); 582 _MAKE_OSABI_CASE(ELFOSABI_FREEBSD); 583 _MAKE_OSABI_CASE(ELFOSABI_TRU64); 584 _MAKE_OSABI_CASE(ELFOSABI_MODESTO); 585 _MAKE_OSABI_CASE(ELFOSABI_OPENBSD); 586 _MAKE_OSABI_CASE(ELFOSABI_OPENVMS); 587 _MAKE_OSABI_CASE(ELFOSABI_NSK); 588 _MAKE_OSABI_CASE(ELFOSABI_AROS); 589 _MAKE_OSABI_CASE(ELFOSABI_FENIXOS); 590 _MAKE_OSABI_CASE(ELFOSABI_C6000_ELFABI); 591 _MAKE_OSABI_CASE(ELFOSABI_C6000_LINUX); 592 _MAKE_OSABI_CASE(ELFOSABI_ARM); 593 _MAKE_OSABI_CASE(ELFOSABI_STANDALONE); 594 default: 595 return "<unknown-osabi>"; 596 } 597 #undef _MAKE_OSABI_CASE 598 } 599 600 // 601 // WARNING : This function is being deprecated 602 // It's functionality has moved to ArchSpec::SetArchitecture 603 // This function is only being kept to validate the move. 604 // 605 // TODO : Remove this function 606 static bool 607 GetOsFromOSABI (unsigned char osabi_byte, llvm::Triple::OSType &ostype) 608 { 609 switch (osabi_byte) 610 { 611 case ELFOSABI_AIX: ostype = llvm::Triple::OSType::AIX; break; 612 case ELFOSABI_FREEBSD: ostype = llvm::Triple::OSType::FreeBSD; break; 613 case ELFOSABI_GNU: ostype = llvm::Triple::OSType::Linux; break; 614 case ELFOSABI_NETBSD: ostype = llvm::Triple::OSType::NetBSD; break; 615 case ELFOSABI_OPENBSD: ostype = llvm::Triple::OSType::OpenBSD; break; 616 case ELFOSABI_SOLARIS: ostype = llvm::Triple::OSType::Solaris; break; 617 default: 618 ostype = llvm::Triple::OSType::UnknownOS; 619 } 620 return ostype != llvm::Triple::OSType::UnknownOS; 621 } 622 623 size_t 624 ObjectFileELF::GetModuleSpecifications (const lldb_private::FileSpec& file, 625 lldb::DataBufferSP& data_sp, 626 lldb::offset_t data_offset, 627 lldb::offset_t file_offset, 628 lldb::offset_t length, 629 lldb_private::ModuleSpecList &specs) 630 { 631 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MODULES)); 632 633 const size_t initial_count = specs.GetSize(); 634 635 if (ObjectFileELF::MagicBytesMatch(data_sp, 0, data_sp->GetByteSize())) 636 { 637 DataExtractor data; 638 data.SetData(data_sp); 639 elf::ELFHeader header; 640 if (header.Parse(data, &data_offset)) 641 { 642 if (data_sp) 643 { 644 ModuleSpec spec (file); 645 646 const uint32_t sub_type = subTypeFromElfHeader(header); 647 spec.GetArchitecture().SetArchitecture(eArchTypeELF, 648 header.e_machine, 649 sub_type, 650 header.e_ident[EI_OSABI]); 651 652 if (spec.GetArchitecture().IsValid()) 653 { 654 llvm::Triple::OSType ostype; 655 llvm::Triple::VendorType vendor; 656 llvm::Triple::OSType spec_ostype = spec.GetArchitecture ().GetTriple ().getOS (); 657 658 if (log) 659 log->Printf ("ObjectFileELF::%s file '%s' module OSABI: %s", __FUNCTION__, file.GetPath ().c_str (), OSABIAsCString (header.e_ident[EI_OSABI])); 660 661 // SetArchitecture should have set the vendor to unknown 662 vendor = spec.GetArchitecture ().GetTriple ().getVendor (); 663 assert(vendor == llvm::Triple::UnknownVendor); 664 665 // 666 // Validate it is ok to remove GetOsFromOSABI 667 GetOsFromOSABI (header.e_ident[EI_OSABI], ostype); 668 assert(spec_ostype == ostype); 669 if (spec_ostype != llvm::Triple::OSType::UnknownOS) 670 { 671 if (log) 672 log->Printf ("ObjectFileELF::%s file '%s' set ELF module OS type from ELF header OSABI.", __FUNCTION__, file.GetPath ().c_str ()); 673 } 674 675 // Try to get the UUID from the section list. Usually that's at the end, so 676 // map the file in if we don't have it already. 677 size_t section_header_end = header.e_shoff + header.e_shnum * header.e_shentsize; 678 if (section_header_end > data_sp->GetByteSize()) 679 { 680 data_sp = file.MemoryMapFileContentsIfLocal (file_offset, section_header_end); 681 data.SetData(data_sp); 682 } 683 684 uint32_t gnu_debuglink_crc = 0; 685 std::string gnu_debuglink_file; 686 SectionHeaderColl section_headers; 687 lldb_private::UUID &uuid = spec.GetUUID(); 688 689 GetSectionHeaderInfo(section_headers, data, header, uuid, gnu_debuglink_file, gnu_debuglink_crc, spec.GetArchitecture ()); 690 691 llvm::Triple &spec_triple = spec.GetArchitecture ().GetTriple (); 692 693 if (log) 694 log->Printf ("ObjectFileELF::%s file '%s' module set to triple: %s (architecture %s)", __FUNCTION__, file.GetPath ().c_str (), spec_triple.getTriple ().c_str (), spec.GetArchitecture ().GetArchitectureName ()); 695 696 if (!uuid.IsValid()) 697 { 698 uint32_t core_notes_crc = 0; 699 700 if (!gnu_debuglink_crc) 701 { 702 lldb_private::Timer scoped_timer (__PRETTY_FUNCTION__, 703 "Calculating module crc32 %s with size %" PRIu64 " KiB", 704 file.GetLastPathComponent().AsCString(), 705 (file.GetByteSize()-file_offset)/1024); 706 707 // For core files - which usually don't happen to have a gnu_debuglink, 708 // and are pretty bulky - calculating whole contents crc32 would be too much of luxury. 709 // Thus we will need to fallback to something simpler. 710 if (header.e_type == llvm::ELF::ET_CORE) 711 { 712 size_t program_headers_end = header.e_phoff + header.e_phnum * header.e_phentsize; 713 if (program_headers_end > data_sp->GetByteSize()) 714 { 715 data_sp = file.MemoryMapFileContentsIfLocal(file_offset, program_headers_end); 716 data.SetData(data_sp); 717 } 718 ProgramHeaderColl program_headers; 719 GetProgramHeaderInfo(program_headers, data, header); 720 721 size_t segment_data_end = 0; 722 for (ProgramHeaderCollConstIter I = program_headers.begin(); 723 I != program_headers.end(); ++I) 724 { 725 segment_data_end = std::max<unsigned long long> (I->p_offset + I->p_filesz, segment_data_end); 726 } 727 728 if (segment_data_end > data_sp->GetByteSize()) 729 { 730 data_sp = file.MemoryMapFileContentsIfLocal(file_offset, segment_data_end); 731 data.SetData(data_sp); 732 } 733 734 core_notes_crc = CalculateELFNotesSegmentsCRC32 (program_headers, data); 735 } 736 else 737 { 738 // Need to map entire file into memory to calculate the crc. 739 data_sp = file.MemoryMapFileContentsIfLocal (file_offset, SIZE_MAX); 740 data.SetData(data_sp); 741 gnu_debuglink_crc = calc_gnu_debuglink_crc32 (data.GetDataStart(), data.GetByteSize()); 742 } 743 } 744 if (gnu_debuglink_crc) 745 { 746 // Use 4 bytes of crc from the .gnu_debuglink section. 747 uint32_t uuidt[4] = { gnu_debuglink_crc, 0, 0, 0 }; 748 uuid.SetBytes (uuidt, sizeof(uuidt)); 749 } 750 else if (core_notes_crc) 751 { 752 // Use 8 bytes - first 4 bytes for *magic* prefix, mainly to make it look different form 753 // .gnu_debuglink crc followed by 4 bytes of note segments crc. 754 uint32_t uuidt[4] = { g_core_uuid_magic, core_notes_crc, 0, 0 }; 755 uuid.SetBytes (uuidt, sizeof(uuidt)); 756 } 757 } 758 759 specs.Append(spec); 760 } 761 } 762 } 763 } 764 765 return specs.GetSize() - initial_count; 766 } 767 768 //------------------------------------------------------------------ 769 // PluginInterface protocol 770 //------------------------------------------------------------------ 771 lldb_private::ConstString 772 ObjectFileELF::GetPluginName() 773 { 774 return GetPluginNameStatic(); 775 } 776 777 uint32_t 778 ObjectFileELF::GetPluginVersion() 779 { 780 return m_plugin_version; 781 } 782 //------------------------------------------------------------------ 783 // ObjectFile protocol 784 //------------------------------------------------------------------ 785 786 ObjectFileELF::ObjectFileELF (const lldb::ModuleSP &module_sp, 787 DataBufferSP& data_sp, 788 lldb::offset_t data_offset, 789 const FileSpec* file, 790 lldb::offset_t file_offset, 791 lldb::offset_t length) : 792 ObjectFile(module_sp, file, file_offset, length, data_sp, data_offset), 793 m_header(), 794 m_uuid(), 795 m_gnu_debuglink_file(), 796 m_gnu_debuglink_crc(0), 797 m_program_headers(), 798 m_section_headers(), 799 m_dynamic_symbols(), 800 m_filespec_ap(), 801 m_entry_point_address(), 802 m_arch_spec() 803 { 804 if (file) 805 m_file = *file; 806 ::memset(&m_header, 0, sizeof(m_header)); 807 } 808 809 ObjectFileELF::ObjectFileELF (const lldb::ModuleSP &module_sp, 810 DataBufferSP& header_data_sp, 811 const lldb::ProcessSP &process_sp, 812 addr_t header_addr) : 813 ObjectFile(module_sp, process_sp, header_addr, header_data_sp), 814 m_header(), 815 m_uuid(), 816 m_gnu_debuglink_file(), 817 m_gnu_debuglink_crc(0), 818 m_program_headers(), 819 m_section_headers(), 820 m_dynamic_symbols(), 821 m_filespec_ap(), 822 m_entry_point_address(), 823 m_arch_spec() 824 { 825 ::memset(&m_header, 0, sizeof(m_header)); 826 } 827 828 ObjectFileELF::~ObjectFileELF() 829 { 830 } 831 832 bool 833 ObjectFileELF::IsExecutable() const 834 { 835 return ((m_header.e_type & ET_EXEC) != 0) || (m_header.e_entry != 0); 836 } 837 838 bool 839 ObjectFileELF::SetLoadAddress (Target &target, 840 lldb::addr_t value, 841 bool value_is_offset) 842 { 843 ModuleSP module_sp = GetModule(); 844 if (module_sp) 845 { 846 size_t num_loaded_sections = 0; 847 SectionList *section_list = GetSectionList (); 848 if (section_list) 849 { 850 if (!value_is_offset) 851 { 852 bool found_offset = false; 853 for (size_t i = 0, count = GetProgramHeaderCount(); i < count; ++i) 854 { 855 const elf::ELFProgramHeader* header = GetProgramHeaderByIndex(i); 856 if (header == nullptr) 857 continue; 858 859 if (header->p_type != PT_LOAD || header->p_offset != 0) 860 continue; 861 862 value = value - header->p_vaddr; 863 found_offset = true; 864 break; 865 } 866 if (!found_offset) 867 return false; 868 } 869 870 const size_t num_sections = section_list->GetSize(); 871 size_t sect_idx = 0; 872 873 for (sect_idx = 0; sect_idx < num_sections; ++sect_idx) 874 { 875 // Iterate through the object file sections to find all 876 // of the sections that have SHF_ALLOC in their flag bits. 877 SectionSP section_sp (section_list->GetSectionAtIndex (sect_idx)); 878 // if (section_sp && !section_sp->IsThreadSpecific()) 879 if (section_sp && section_sp->Test(SHF_ALLOC)) 880 { 881 lldb::addr_t load_addr = section_sp->GetFileAddress() + value; 882 883 // On 32-bit systems the load address have to fit into 4 bytes. The rest of 884 // the bytes are the overflow from the addition. 885 if (GetAddressByteSize() == 4) 886 load_addr &= 0xFFFFFFFF; 887 888 if (target.GetSectionLoadList().SetSectionLoadAddress (section_sp, load_addr)) 889 ++num_loaded_sections; 890 } 891 } 892 return num_loaded_sections > 0; 893 } 894 } 895 return false; 896 } 897 898 ByteOrder 899 ObjectFileELF::GetByteOrder() const 900 { 901 if (m_header.e_ident[EI_DATA] == ELFDATA2MSB) 902 return eByteOrderBig; 903 if (m_header.e_ident[EI_DATA] == ELFDATA2LSB) 904 return eByteOrderLittle; 905 return eByteOrderInvalid; 906 } 907 908 uint32_t 909 ObjectFileELF::GetAddressByteSize() const 910 { 911 return m_data.GetAddressByteSize(); 912 } 913 914 // Top 16 bits of the `Symbol` flags are available. 915 #define ARM_ELF_SYM_IS_THUMB (1 << 16) 916 917 AddressClass 918 ObjectFileELF::GetAddressClass (addr_t file_addr) 919 { 920 Symtab* symtab = GetSymtab(); 921 if (!symtab) 922 return eAddressClassUnknown; 923 924 // The address class is determined based on the symtab. Ask it from the object file what 925 // contains the symtab information. 926 ObjectFile* symtab_objfile = symtab->GetObjectFile(); 927 if (symtab_objfile != nullptr && symtab_objfile != this) 928 return symtab_objfile->GetAddressClass(file_addr); 929 930 auto res = ObjectFile::GetAddressClass (file_addr); 931 if (res != eAddressClassCode) 932 return res; 933 934 auto ub = m_address_class_map.upper_bound(file_addr); 935 if (ub == m_address_class_map.begin()) 936 { 937 // No entry in the address class map before the address. Return 938 // default address class for an address in a code section. 939 return eAddressClassCode; 940 } 941 942 // Move iterator to the address class entry preceding address 943 --ub; 944 945 return ub->second; 946 } 947 948 size_t 949 ObjectFileELF::SectionIndex(const SectionHeaderCollIter &I) 950 { 951 return std::distance(m_section_headers.begin(), I) + 1u; 952 } 953 954 size_t 955 ObjectFileELF::SectionIndex(const SectionHeaderCollConstIter &I) const 956 { 957 return std::distance(m_section_headers.begin(), I) + 1u; 958 } 959 960 bool 961 ObjectFileELF::ParseHeader() 962 { 963 lldb::offset_t offset = 0; 964 if (!m_header.Parse(m_data, &offset)) 965 return false; 966 967 if (!IsInMemory()) 968 return true; 969 970 // For in memory object files m_data might not contain the full object file. Try to load it 971 // until the end of the "Section header table" what is at the end of the ELF file. 972 addr_t file_size = m_header.e_shoff + m_header.e_shnum * m_header.e_shentsize; 973 if (m_data.GetByteSize() < file_size) 974 { 975 ProcessSP process_sp (m_process_wp.lock()); 976 if (!process_sp) 977 return false; 978 979 DataBufferSP data_sp = ReadMemory(process_sp, m_memory_addr, file_size); 980 if (!data_sp) 981 return false; 982 m_data.SetData(data_sp, 0, file_size); 983 } 984 985 return true; 986 } 987 988 bool 989 ObjectFileELF::GetUUID(lldb_private::UUID* uuid) 990 { 991 // Need to parse the section list to get the UUIDs, so make sure that's been done. 992 if (!ParseSectionHeaders() && GetType() != ObjectFile::eTypeCoreFile) 993 return false; 994 995 if (m_uuid.IsValid()) 996 { 997 // We have the full build id uuid. 998 *uuid = m_uuid; 999 return true; 1000 } 1001 else if (GetType() == ObjectFile::eTypeCoreFile) 1002 { 1003 uint32_t core_notes_crc = 0; 1004 1005 if (!ParseProgramHeaders()) 1006 return false; 1007 1008 core_notes_crc = CalculateELFNotesSegmentsCRC32(m_program_headers, m_data); 1009 1010 if (core_notes_crc) 1011 { 1012 // Use 8 bytes - first 4 bytes for *magic* prefix, mainly to make it 1013 // look different form .gnu_debuglink crc - followed by 4 bytes of note 1014 // segments crc. 1015 uint32_t uuidt[4] = { g_core_uuid_magic, core_notes_crc, 0, 0 }; 1016 m_uuid.SetBytes (uuidt, sizeof(uuidt)); 1017 } 1018 } 1019 else 1020 { 1021 if (!m_gnu_debuglink_crc) 1022 m_gnu_debuglink_crc = calc_gnu_debuglink_crc32 (m_data.GetDataStart(), m_data.GetByteSize()); 1023 if (m_gnu_debuglink_crc) 1024 { 1025 // Use 4 bytes of crc from the .gnu_debuglink section. 1026 uint32_t uuidt[4] = { m_gnu_debuglink_crc, 0, 0, 0 }; 1027 m_uuid.SetBytes (uuidt, sizeof(uuidt)); 1028 } 1029 } 1030 1031 if (m_uuid.IsValid()) 1032 { 1033 *uuid = m_uuid; 1034 return true; 1035 } 1036 1037 return false; 1038 } 1039 1040 lldb_private::FileSpecList 1041 ObjectFileELF::GetDebugSymbolFilePaths() 1042 { 1043 FileSpecList file_spec_list; 1044 1045 if (!m_gnu_debuglink_file.empty()) 1046 { 1047 FileSpec file_spec (m_gnu_debuglink_file.c_str(), false); 1048 file_spec_list.Append (file_spec); 1049 } 1050 return file_spec_list; 1051 } 1052 1053 uint32_t 1054 ObjectFileELF::GetDependentModules(FileSpecList &files) 1055 { 1056 size_t num_modules = ParseDependentModules(); 1057 uint32_t num_specs = 0; 1058 1059 for (unsigned i = 0; i < num_modules; ++i) 1060 { 1061 if (files.AppendIfUnique(m_filespec_ap->GetFileSpecAtIndex(i))) 1062 num_specs++; 1063 } 1064 1065 return num_specs; 1066 } 1067 1068 Address 1069 ObjectFileELF::GetImageInfoAddress(Target *target) 1070 { 1071 if (!ParseDynamicSymbols()) 1072 return Address(); 1073 1074 SectionList *section_list = GetSectionList(); 1075 if (!section_list) 1076 return Address(); 1077 1078 // Find the SHT_DYNAMIC (.dynamic) section. 1079 SectionSP dynsym_section_sp (section_list->FindSectionByType (eSectionTypeELFDynamicLinkInfo, true)); 1080 if (!dynsym_section_sp) 1081 return Address(); 1082 assert (dynsym_section_sp->GetObjectFile() == this); 1083 1084 user_id_t dynsym_id = dynsym_section_sp->GetID(); 1085 const ELFSectionHeaderInfo *dynsym_hdr = GetSectionHeaderByIndex(dynsym_id); 1086 if (!dynsym_hdr) 1087 return Address(); 1088 1089 for (size_t i = 0; i < m_dynamic_symbols.size(); ++i) 1090 { 1091 ELFDynamic &symbol = m_dynamic_symbols[i]; 1092 1093 if (symbol.d_tag == DT_DEBUG) 1094 { 1095 // Compute the offset as the number of previous entries plus the 1096 // size of d_tag. 1097 addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize(); 1098 return Address(dynsym_section_sp, offset); 1099 } 1100 else if (symbol.d_tag == DT_MIPS_RLD_MAP && target) 1101 { 1102 addr_t offset = i * dynsym_hdr->sh_entsize + GetAddressByteSize(); 1103 addr_t dyn_base = dynsym_section_sp->GetLoadBaseAddress(target); 1104 if (dyn_base == LLDB_INVALID_ADDRESS) 1105 return Address(); 1106 Address addr; 1107 Error error; 1108 if (target->ReadPointerFromMemory(dyn_base + offset, false, error, addr)) 1109 return addr; 1110 } 1111 } 1112 1113 return Address(); 1114 } 1115 1116 lldb_private::Address 1117 ObjectFileELF::GetEntryPointAddress () 1118 { 1119 if (m_entry_point_address.IsValid()) 1120 return m_entry_point_address; 1121 1122 if (!ParseHeader() || !IsExecutable()) 1123 return m_entry_point_address; 1124 1125 SectionList *section_list = GetSectionList(); 1126 addr_t offset = m_header.e_entry; 1127 1128 if (!section_list) 1129 m_entry_point_address.SetOffset(offset); 1130 else 1131 m_entry_point_address.ResolveAddressUsingFileSections(offset, section_list); 1132 return m_entry_point_address; 1133 } 1134 1135 //---------------------------------------------------------------------- 1136 // ParseDependentModules 1137 //---------------------------------------------------------------------- 1138 size_t 1139 ObjectFileELF::ParseDependentModules() 1140 { 1141 if (m_filespec_ap.get()) 1142 return m_filespec_ap->GetSize(); 1143 1144 m_filespec_ap.reset(new FileSpecList()); 1145 1146 if (!ParseSectionHeaders()) 1147 return 0; 1148 1149 SectionList *section_list = GetSectionList(); 1150 if (!section_list) 1151 return 0; 1152 1153 // Find the SHT_DYNAMIC section. 1154 Section *dynsym = section_list->FindSectionByType (eSectionTypeELFDynamicLinkInfo, true).get(); 1155 if (!dynsym) 1156 return 0; 1157 assert (dynsym->GetObjectFile() == this); 1158 1159 const ELFSectionHeaderInfo *header = GetSectionHeaderByIndex (dynsym->GetID()); 1160 if (!header) 1161 return 0; 1162 // sh_link: section header index of string table used by entries in the section. 1163 Section *dynstr = section_list->FindSectionByID (header->sh_link + 1).get(); 1164 if (!dynstr) 1165 return 0; 1166 1167 DataExtractor dynsym_data; 1168 DataExtractor dynstr_data; 1169 if (ReadSectionData(dynsym, dynsym_data) && 1170 ReadSectionData(dynstr, dynstr_data)) 1171 { 1172 ELFDynamic symbol; 1173 const lldb::offset_t section_size = dynsym_data.GetByteSize(); 1174 lldb::offset_t offset = 0; 1175 1176 // The only type of entries we are concerned with are tagged DT_NEEDED, 1177 // yielding the name of a required library. 1178 while (offset < section_size) 1179 { 1180 if (!symbol.Parse(dynsym_data, &offset)) 1181 break; 1182 1183 if (symbol.d_tag != DT_NEEDED) 1184 continue; 1185 1186 uint32_t str_index = static_cast<uint32_t>(symbol.d_val); 1187 const char *lib_name = dynstr_data.PeekCStr(str_index); 1188 m_filespec_ap->Append(FileSpec(lib_name, true)); 1189 } 1190 } 1191 1192 return m_filespec_ap->GetSize(); 1193 } 1194 1195 //---------------------------------------------------------------------- 1196 // GetProgramHeaderInfo 1197 //---------------------------------------------------------------------- 1198 size_t 1199 ObjectFileELF::GetProgramHeaderInfo(ProgramHeaderColl &program_headers, 1200 DataExtractor &object_data, 1201 const ELFHeader &header) 1202 { 1203 // We have already parsed the program headers 1204 if (!program_headers.empty()) 1205 return program_headers.size(); 1206 1207 // If there are no program headers to read we are done. 1208 if (header.e_phnum == 0) 1209 return 0; 1210 1211 program_headers.resize(header.e_phnum); 1212 if (program_headers.size() != header.e_phnum) 1213 return 0; 1214 1215 const size_t ph_size = header.e_phnum * header.e_phentsize; 1216 const elf_off ph_offset = header.e_phoff; 1217 DataExtractor data; 1218 if (data.SetData(object_data, ph_offset, ph_size) != ph_size) 1219 return 0; 1220 1221 uint32_t idx; 1222 lldb::offset_t offset; 1223 for (idx = 0, offset = 0; idx < header.e_phnum; ++idx) 1224 { 1225 if (program_headers[idx].Parse(data, &offset) == false) 1226 break; 1227 } 1228 1229 if (idx < program_headers.size()) 1230 program_headers.resize(idx); 1231 1232 return program_headers.size(); 1233 1234 } 1235 1236 //---------------------------------------------------------------------- 1237 // ParseProgramHeaders 1238 //---------------------------------------------------------------------- 1239 size_t 1240 ObjectFileELF::ParseProgramHeaders() 1241 { 1242 return GetProgramHeaderInfo(m_program_headers, m_data, m_header); 1243 } 1244 1245 lldb_private::Error 1246 ObjectFileELF::RefineModuleDetailsFromNote (lldb_private::DataExtractor &data, lldb_private::ArchSpec &arch_spec, lldb_private::UUID &uuid) 1247 { 1248 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MODULES)); 1249 Error error; 1250 1251 lldb::offset_t offset = 0; 1252 1253 while (true) 1254 { 1255 // Parse the note header. If this fails, bail out. 1256 ELFNote note = ELFNote(); 1257 if (!note.Parse(data, &offset)) 1258 { 1259 // We're done. 1260 return error; 1261 } 1262 1263 // If a tag processor handles the tag, it should set processed to true, and 1264 // the loop will assume the tag processing has moved entirely past the note's payload. 1265 // Otherwise, leave it false and the end of the loop will handle the offset properly. 1266 bool processed = false; 1267 1268 if (log) 1269 log->Printf ("ObjectFileELF::%s parsing note name='%s', type=%" PRIu32, __FUNCTION__, note.n_name.c_str (), note.n_type); 1270 1271 // Process FreeBSD ELF notes. 1272 if ((note.n_name == LLDB_NT_OWNER_FREEBSD) && 1273 (note.n_type == LLDB_NT_FREEBSD_ABI_TAG) && 1274 (note.n_descsz == LLDB_NT_FREEBSD_ABI_SIZE)) 1275 { 1276 // We'll consume the payload below. 1277 processed = true; 1278 1279 // Pull out the min version info. 1280 uint32_t version_info; 1281 if (data.GetU32 (&offset, &version_info, 1) == nullptr) 1282 { 1283 error.SetErrorString ("failed to read FreeBSD ABI note payload"); 1284 return error; 1285 } 1286 1287 // Convert the version info into a major/minor number. 1288 const uint32_t version_major = version_info / 100000; 1289 const uint32_t version_minor = (version_info / 1000) % 100; 1290 1291 char os_name[32]; 1292 snprintf (os_name, sizeof (os_name), "freebsd%" PRIu32 ".%" PRIu32, version_major, version_minor); 1293 1294 // Set the elf OS version to FreeBSD. Also clear the vendor. 1295 arch_spec.GetTriple ().setOSName (os_name); 1296 arch_spec.GetTriple ().setVendor (llvm::Triple::VendorType::UnknownVendor); 1297 1298 if (log) 1299 log->Printf ("ObjectFileELF::%s detected FreeBSD %" PRIu32 ".%" PRIu32 ".%" PRIu32, __FUNCTION__, version_major, version_minor, static_cast<uint32_t> (version_info % 1000)); 1300 } 1301 // Process GNU ELF notes. 1302 else if (note.n_name == LLDB_NT_OWNER_GNU) 1303 { 1304 switch (note.n_type) 1305 { 1306 case LLDB_NT_GNU_ABI_TAG: 1307 if (note.n_descsz == LLDB_NT_GNU_ABI_SIZE) 1308 { 1309 // We'll consume the payload below. 1310 processed = true; 1311 1312 // Pull out the min OS version supporting the ABI. 1313 uint32_t version_info[4]; 1314 if (data.GetU32 (&offset, &version_info[0], note.n_descsz / 4) == nullptr) 1315 { 1316 error.SetErrorString ("failed to read GNU ABI note payload"); 1317 return error; 1318 } 1319 1320 // Set the OS per the OS field. 1321 switch (version_info[0]) 1322 { 1323 case LLDB_NT_GNU_ABI_OS_LINUX: 1324 arch_spec.GetTriple ().setOS (llvm::Triple::OSType::Linux); 1325 arch_spec.GetTriple ().setVendor (llvm::Triple::VendorType::UnknownVendor); 1326 if (log) 1327 log->Printf ("ObjectFileELF::%s detected Linux, min version %" PRIu32 ".%" PRIu32 ".%" PRIu32, __FUNCTION__, version_info[1], version_info[2], version_info[3]); 1328 // FIXME we have the minimal version number, we could be propagating that. version_info[1] = OS Major, version_info[2] = OS Minor, version_info[3] = Revision. 1329 break; 1330 case LLDB_NT_GNU_ABI_OS_HURD: 1331 arch_spec.GetTriple ().setOS (llvm::Triple::OSType::UnknownOS); 1332 arch_spec.GetTriple ().setVendor (llvm::Triple::VendorType::UnknownVendor); 1333 if (log) 1334 log->Printf ("ObjectFileELF::%s detected Hurd (unsupported), min version %" PRIu32 ".%" PRIu32 ".%" PRIu32, __FUNCTION__, version_info[1], version_info[2], version_info[3]); 1335 break; 1336 case LLDB_NT_GNU_ABI_OS_SOLARIS: 1337 arch_spec.GetTriple ().setOS (llvm::Triple::OSType::Solaris); 1338 arch_spec.GetTriple ().setVendor (llvm::Triple::VendorType::UnknownVendor); 1339 if (log) 1340 log->Printf ("ObjectFileELF::%s detected Solaris, min version %" PRIu32 ".%" PRIu32 ".%" PRIu32, __FUNCTION__, version_info[1], version_info[2], version_info[3]); 1341 break; 1342 default: 1343 if (log) 1344 log->Printf ("ObjectFileELF::%s unrecognized OS in note, id %" PRIu32 ", min version %" PRIu32 ".%" PRIu32 ".%" PRIu32, __FUNCTION__, version_info[0], version_info[1], version_info[2], version_info[3]); 1345 break; 1346 } 1347 } 1348 break; 1349 1350 case LLDB_NT_GNU_BUILD_ID_TAG: 1351 // Only bother processing this if we don't already have the uuid set. 1352 if (!uuid.IsValid()) 1353 { 1354 // We'll consume the payload below. 1355 processed = true; 1356 1357 // 16 bytes is UUID|MD5, 20 bytes is SHA1 1358 if ((note.n_descsz == 16 || note.n_descsz == 20)) 1359 { 1360 uint8_t uuidbuf[20]; 1361 if (data.GetU8 (&offset, &uuidbuf, note.n_descsz) == nullptr) 1362 { 1363 error.SetErrorString ("failed to read GNU_BUILD_ID note payload"); 1364 return error; 1365 } 1366 1367 // Save the build id as the UUID for the module. 1368 uuid.SetBytes (uuidbuf, note.n_descsz); 1369 } 1370 } 1371 break; 1372 } 1373 } 1374 // Process NetBSD ELF notes. 1375 else if ((note.n_name == LLDB_NT_OWNER_NETBSD) && 1376 (note.n_type == LLDB_NT_NETBSD_ABI_TAG) && 1377 (note.n_descsz == LLDB_NT_NETBSD_ABI_SIZE)) 1378 { 1379 1380 // We'll consume the payload below. 1381 processed = true; 1382 1383 // Pull out the min version info. 1384 uint32_t version_info; 1385 if (data.GetU32 (&offset, &version_info, 1) == nullptr) 1386 { 1387 error.SetErrorString ("failed to read NetBSD ABI note payload"); 1388 return error; 1389 } 1390 1391 // Set the elf OS version to NetBSD. Also clear the vendor. 1392 arch_spec.GetTriple ().setOS (llvm::Triple::OSType::NetBSD); 1393 arch_spec.GetTriple ().setVendor (llvm::Triple::VendorType::UnknownVendor); 1394 1395 if (log) 1396 log->Printf ("ObjectFileELF::%s detected NetBSD, min version constant %" PRIu32, __FUNCTION__, version_info); 1397 } 1398 // Process CSR kalimba notes 1399 else if ((note.n_type == LLDB_NT_GNU_ABI_TAG) && 1400 (note.n_name == LLDB_NT_OWNER_CSR)) 1401 { 1402 // We'll consume the payload below. 1403 processed = true; 1404 arch_spec.GetTriple().setOS(llvm::Triple::OSType::UnknownOS); 1405 arch_spec.GetTriple().setVendor(llvm::Triple::VendorType::CSR); 1406 1407 // TODO At some point the description string could be processed. 1408 // It could provide a steer towards the kalimba variant which 1409 // this ELF targets. 1410 if(note.n_descsz) 1411 { 1412 const char *cstr = data.GetCStr(&offset, llvm::RoundUpToAlignment (note.n_descsz, 4)); 1413 (void)cstr; 1414 } 1415 } 1416 else if (note.n_name == LLDB_NT_OWNER_ANDROID) 1417 { 1418 arch_spec.GetTriple().setOS(llvm::Triple::OSType::Linux); 1419 arch_spec.GetTriple().setEnvironment(llvm::Triple::EnvironmentType::Android); 1420 } 1421 1422 if (!processed) 1423 offset += llvm::RoundUpToAlignment(note.n_descsz, 4); 1424 } 1425 1426 return error; 1427 } 1428 1429 1430 //---------------------------------------------------------------------- 1431 // GetSectionHeaderInfo 1432 //---------------------------------------------------------------------- 1433 size_t 1434 ObjectFileELF::GetSectionHeaderInfo(SectionHeaderColl §ion_headers, 1435 lldb_private::DataExtractor &object_data, 1436 const elf::ELFHeader &header, 1437 lldb_private::UUID &uuid, 1438 std::string &gnu_debuglink_file, 1439 uint32_t &gnu_debuglink_crc, 1440 ArchSpec &arch_spec) 1441 { 1442 // Don't reparse the section headers if we already did that. 1443 if (!section_headers.empty()) 1444 return section_headers.size(); 1445 1446 // Only initialize the arch_spec to okay defaults if they're not already set. 1447 // We'll refine this with note data as we parse the notes. 1448 if (arch_spec.GetTriple ().getOS () == llvm::Triple::OSType::UnknownOS) 1449 { 1450 llvm::Triple::OSType ostype; 1451 llvm::Triple::OSType spec_ostype; 1452 const uint32_t sub_type = subTypeFromElfHeader(header); 1453 arch_spec.SetArchitecture (eArchTypeELF, header.e_machine, sub_type, header.e_ident[EI_OSABI]); 1454 // 1455 // Validate if it is ok to remove GetOsFromOSABI 1456 GetOsFromOSABI (header.e_ident[EI_OSABI], ostype); 1457 spec_ostype = arch_spec.GetTriple ().getOS (); 1458 assert(spec_ostype == ostype); 1459 } 1460 1461 if (arch_spec.GetMachine() == llvm::Triple::mips || arch_spec.GetMachine() == llvm::Triple::mipsel 1462 || arch_spec.GetMachine() == llvm::Triple::mips64 || arch_spec.GetMachine() == llvm::Triple::mips64el) 1463 { 1464 switch (header.e_flags & llvm::ELF::EF_MIPS_ARCH_ASE) 1465 { 1466 case llvm::ELF::EF_MIPS_MICROMIPS: 1467 arch_spec.SetFlags (ArchSpec::eMIPSAse_micromips); 1468 break; 1469 case llvm::ELF::EF_MIPS_ARCH_ASE_M16: 1470 arch_spec.SetFlags (ArchSpec::eMIPSAse_mips16); 1471 break; 1472 case llvm::ELF::EF_MIPS_ARCH_ASE_MDMX: 1473 arch_spec.SetFlags (ArchSpec::eMIPSAse_mdmx); 1474 break; 1475 default: 1476 break; 1477 } 1478 } 1479 1480 // If there are no section headers we are done. 1481 if (header.e_shnum == 0) 1482 return 0; 1483 1484 Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MODULES)); 1485 1486 section_headers.resize(header.e_shnum); 1487 if (section_headers.size() != header.e_shnum) 1488 return 0; 1489 1490 const size_t sh_size = header.e_shnum * header.e_shentsize; 1491 const elf_off sh_offset = header.e_shoff; 1492 DataExtractor sh_data; 1493 if (sh_data.SetData (object_data, sh_offset, sh_size) != sh_size) 1494 return 0; 1495 1496 uint32_t idx; 1497 lldb::offset_t offset; 1498 for (idx = 0, offset = 0; idx < header.e_shnum; ++idx) 1499 { 1500 if (section_headers[idx].Parse(sh_data, &offset) == false) 1501 break; 1502 } 1503 if (idx < section_headers.size()) 1504 section_headers.resize(idx); 1505 1506 const unsigned strtab_idx = header.e_shstrndx; 1507 if (strtab_idx && strtab_idx < section_headers.size()) 1508 { 1509 const ELFSectionHeaderInfo &sheader = section_headers[strtab_idx]; 1510 const size_t byte_size = sheader.sh_size; 1511 const Elf64_Off offset = sheader.sh_offset; 1512 lldb_private::DataExtractor shstr_data; 1513 1514 if (shstr_data.SetData (object_data, offset, byte_size) == byte_size) 1515 { 1516 for (SectionHeaderCollIter I = section_headers.begin(); 1517 I != section_headers.end(); ++I) 1518 { 1519 static ConstString g_sect_name_gnu_debuglink (".gnu_debuglink"); 1520 const ELFSectionHeaderInfo &sheader = *I; 1521 const uint64_t section_size = sheader.sh_type == SHT_NOBITS ? 0 : sheader.sh_size; 1522 ConstString name(shstr_data.PeekCStr(I->sh_name)); 1523 1524 I->section_name = name; 1525 1526 if (arch_spec.GetMachine() == llvm::Triple::mips || arch_spec.GetMachine() == llvm::Triple::mipsel 1527 || arch_spec.GetMachine() == llvm::Triple::mips64 || arch_spec.GetMachine() == llvm::Triple::mips64el) 1528 { 1529 uint32_t arch_flags = arch_spec.GetFlags (); 1530 DataExtractor data; 1531 if (sheader.sh_type == SHT_MIPS_ABIFLAGS) 1532 { 1533 1534 if (section_size && (data.SetData (object_data, sheader.sh_offset, section_size) == section_size)) 1535 { 1536 lldb::offset_t ase_offset = 12; // MIPS ABI Flags Version: 0 1537 arch_flags |= data.GetU32 (&ase_offset); 1538 } 1539 } 1540 // Settings appropriate ArchSpec ABI Flags 1541 if (header.e_flags & llvm::ELF::EF_MIPS_ABI2) 1542 { 1543 arch_flags |= lldb_private::ArchSpec::eMIPSABI_N32; 1544 } 1545 else if (header.e_flags & llvm::ELF::EF_MIPS_ABI_O32) 1546 { 1547 arch_flags |= lldb_private::ArchSpec::eMIPSABI_O32; 1548 } 1549 arch_spec.SetFlags (arch_flags); 1550 } 1551 1552 if (name == g_sect_name_gnu_debuglink) 1553 { 1554 DataExtractor data; 1555 if (section_size && (data.SetData (object_data, sheader.sh_offset, section_size) == section_size)) 1556 { 1557 lldb::offset_t gnu_debuglink_offset = 0; 1558 gnu_debuglink_file = data.GetCStr (&gnu_debuglink_offset); 1559 gnu_debuglink_offset = llvm::RoundUpToAlignment (gnu_debuglink_offset, 4); 1560 data.GetU32 (&gnu_debuglink_offset, &gnu_debuglink_crc, 1); 1561 } 1562 } 1563 1564 // Process ELF note section entries. 1565 bool is_note_header = (sheader.sh_type == SHT_NOTE); 1566 1567 // The section header ".note.android.ident" is stored as a 1568 // PROGBITS type header but it is actually a note header. 1569 static ConstString g_sect_name_android_ident (".note.android.ident"); 1570 if (!is_note_header && name == g_sect_name_android_ident) 1571 is_note_header = true; 1572 1573 if (is_note_header) 1574 { 1575 // Allow notes to refine module info. 1576 DataExtractor data; 1577 if (section_size && (data.SetData (object_data, sheader.sh_offset, section_size) == section_size)) 1578 { 1579 Error error = RefineModuleDetailsFromNote (data, arch_spec, uuid); 1580 if (error.Fail ()) 1581 { 1582 if (log) 1583 log->Printf ("ObjectFileELF::%s ELF note processing failed: %s", __FUNCTION__, error.AsCString ()); 1584 } 1585 } 1586 } 1587 } 1588 1589 return section_headers.size(); 1590 } 1591 } 1592 1593 section_headers.clear(); 1594 return 0; 1595 } 1596 1597 size_t 1598 ObjectFileELF::GetProgramHeaderCount() 1599 { 1600 return ParseProgramHeaders(); 1601 } 1602 1603 const elf::ELFProgramHeader * 1604 ObjectFileELF::GetProgramHeaderByIndex(lldb::user_id_t id) 1605 { 1606 if (!id || !ParseProgramHeaders()) 1607 return NULL; 1608 1609 if (--id < m_program_headers.size()) 1610 return &m_program_headers[id]; 1611 1612 return NULL; 1613 } 1614 1615 DataExtractor 1616 ObjectFileELF::GetSegmentDataByIndex(lldb::user_id_t id) 1617 { 1618 const elf::ELFProgramHeader *segment_header = GetProgramHeaderByIndex(id); 1619 if (segment_header == NULL) 1620 return DataExtractor(); 1621 return DataExtractor(m_data, segment_header->p_offset, segment_header->p_filesz); 1622 } 1623 1624 std::string 1625 ObjectFileELF::StripLinkerSymbolAnnotations(llvm::StringRef symbol_name) const 1626 { 1627 size_t pos = symbol_name.find('@'); 1628 return symbol_name.substr(0, pos).str(); 1629 } 1630 1631 //---------------------------------------------------------------------- 1632 // ParseSectionHeaders 1633 //---------------------------------------------------------------------- 1634 size_t 1635 ObjectFileELF::ParseSectionHeaders() 1636 { 1637 return GetSectionHeaderInfo(m_section_headers, m_data, m_header, m_uuid, m_gnu_debuglink_file, m_gnu_debuglink_crc, m_arch_spec); 1638 } 1639 1640 const ObjectFileELF::ELFSectionHeaderInfo * 1641 ObjectFileELF::GetSectionHeaderByIndex(lldb::user_id_t id) 1642 { 1643 if (!id || !ParseSectionHeaders()) 1644 return NULL; 1645 1646 if (--id < m_section_headers.size()) 1647 return &m_section_headers[id]; 1648 1649 return NULL; 1650 } 1651 1652 lldb::user_id_t 1653 ObjectFileELF::GetSectionIndexByName(const char* name) 1654 { 1655 if (!name || !name[0] || !ParseSectionHeaders()) 1656 return 0; 1657 for (size_t i = 1; i < m_section_headers.size(); ++i) 1658 if (m_section_headers[i].section_name == ConstString(name)) 1659 return i; 1660 return 0; 1661 } 1662 1663 void 1664 ObjectFileELF::CreateSections(SectionList &unified_section_list) 1665 { 1666 if (!m_sections_ap.get() && ParseSectionHeaders()) 1667 { 1668 m_sections_ap.reset(new SectionList()); 1669 1670 for (SectionHeaderCollIter I = m_section_headers.begin(); 1671 I != m_section_headers.end(); ++I) 1672 { 1673 const ELFSectionHeaderInfo &header = *I; 1674 1675 ConstString& name = I->section_name; 1676 const uint64_t file_size = header.sh_type == SHT_NOBITS ? 0 : header.sh_size; 1677 const uint64_t vm_size = header.sh_flags & SHF_ALLOC ? header.sh_size : 0; 1678 1679 static ConstString g_sect_name_text (".text"); 1680 static ConstString g_sect_name_data (".data"); 1681 static ConstString g_sect_name_bss (".bss"); 1682 static ConstString g_sect_name_tdata (".tdata"); 1683 static ConstString g_sect_name_tbss (".tbss"); 1684 static ConstString g_sect_name_dwarf_debug_abbrev (".debug_abbrev"); 1685 static ConstString g_sect_name_dwarf_debug_addr (".debug_addr"); 1686 static ConstString g_sect_name_dwarf_debug_aranges (".debug_aranges"); 1687 static ConstString g_sect_name_dwarf_debug_frame (".debug_frame"); 1688 static ConstString g_sect_name_dwarf_debug_info (".debug_info"); 1689 static ConstString g_sect_name_dwarf_debug_line (".debug_line"); 1690 static ConstString g_sect_name_dwarf_debug_loc (".debug_loc"); 1691 static ConstString g_sect_name_dwarf_debug_macinfo (".debug_macinfo"); 1692 static ConstString g_sect_name_dwarf_debug_pubnames (".debug_pubnames"); 1693 static ConstString g_sect_name_dwarf_debug_pubtypes (".debug_pubtypes"); 1694 static ConstString g_sect_name_dwarf_debug_ranges (".debug_ranges"); 1695 static ConstString g_sect_name_dwarf_debug_str (".debug_str"); 1696 static ConstString g_sect_name_dwarf_debug_str_offsets (".debug_str_offsets"); 1697 static ConstString g_sect_name_dwarf_debug_abbrev_dwo (".debug_abbrev.dwo"); 1698 static ConstString g_sect_name_dwarf_debug_info_dwo (".debug_info.dwo"); 1699 static ConstString g_sect_name_dwarf_debug_line_dwo (".debug_line.dwo"); 1700 static ConstString g_sect_name_dwarf_debug_loc_dwo (".debug_loc.dwo"); 1701 static ConstString g_sect_name_dwarf_debug_str_dwo (".debug_str.dwo"); 1702 static ConstString g_sect_name_dwarf_debug_str_offsets_dwo (".debug_str_offsets.dwo"); 1703 static ConstString g_sect_name_eh_frame (".eh_frame"); 1704 1705 SectionType sect_type = eSectionTypeOther; 1706 1707 bool is_thread_specific = false; 1708 1709 if (name == g_sect_name_text) sect_type = eSectionTypeCode; 1710 else if (name == g_sect_name_data) sect_type = eSectionTypeData; 1711 else if (name == g_sect_name_bss) sect_type = eSectionTypeZeroFill; 1712 else if (name == g_sect_name_tdata) 1713 { 1714 sect_type = eSectionTypeData; 1715 is_thread_specific = true; 1716 } 1717 else if (name == g_sect_name_tbss) 1718 { 1719 sect_type = eSectionTypeZeroFill; 1720 is_thread_specific = true; 1721 } 1722 // .debug_abbrev – Abbreviations used in the .debug_info section 1723 // .debug_aranges – Lookup table for mapping addresses to compilation units 1724 // .debug_frame – Call frame information 1725 // .debug_info – The core DWARF information section 1726 // .debug_line – Line number information 1727 // .debug_loc – Location lists used in DW_AT_location attributes 1728 // .debug_macinfo – Macro information 1729 // .debug_pubnames – Lookup table for mapping object and function names to compilation units 1730 // .debug_pubtypes – Lookup table for mapping type names to compilation units 1731 // .debug_ranges – Address ranges used in DW_AT_ranges attributes 1732 // .debug_str – String table used in .debug_info 1733 // MISSING? .gnu_debugdata - "mini debuginfo / MiniDebugInfo" section, http://sourceware.org/gdb/onlinedocs/gdb/MiniDebugInfo.html 1734 // MISSING? .debug-index - http://src.chromium.org/viewvc/chrome/trunk/src/build/gdb-add-index?pathrev=144644 1735 // MISSING? .debug_types - Type descriptions from DWARF 4? See http://gcc.gnu.org/wiki/DwarfSeparateTypeInfo 1736 else if (name == g_sect_name_dwarf_debug_abbrev) sect_type = eSectionTypeDWARFDebugAbbrev; 1737 else if (name == g_sect_name_dwarf_debug_addr) sect_type = eSectionTypeDWARFDebugAddr; 1738 else if (name == g_sect_name_dwarf_debug_aranges) sect_type = eSectionTypeDWARFDebugAranges; 1739 else if (name == g_sect_name_dwarf_debug_frame) sect_type = eSectionTypeDWARFDebugFrame; 1740 else if (name == g_sect_name_dwarf_debug_info) sect_type = eSectionTypeDWARFDebugInfo; 1741 else if (name == g_sect_name_dwarf_debug_line) sect_type = eSectionTypeDWARFDebugLine; 1742 else if (name == g_sect_name_dwarf_debug_loc) sect_type = eSectionTypeDWARFDebugLoc; 1743 else if (name == g_sect_name_dwarf_debug_macinfo) sect_type = eSectionTypeDWARFDebugMacInfo; 1744 else if (name == g_sect_name_dwarf_debug_pubnames) sect_type = eSectionTypeDWARFDebugPubNames; 1745 else if (name == g_sect_name_dwarf_debug_pubtypes) sect_type = eSectionTypeDWARFDebugPubTypes; 1746 else if (name == g_sect_name_dwarf_debug_ranges) sect_type = eSectionTypeDWARFDebugRanges; 1747 else if (name == g_sect_name_dwarf_debug_str) sect_type = eSectionTypeDWARFDebugStr; 1748 else if (name == g_sect_name_dwarf_debug_str_offsets) sect_type = eSectionTypeDWARFDebugStrOffsets; 1749 else if (name == g_sect_name_dwarf_debug_abbrev_dwo) sect_type = eSectionTypeDWARFDebugAbbrev; 1750 else if (name == g_sect_name_dwarf_debug_info_dwo) sect_type = eSectionTypeDWARFDebugInfo; 1751 else if (name == g_sect_name_dwarf_debug_line_dwo) sect_type = eSectionTypeDWARFDebugLine; 1752 else if (name == g_sect_name_dwarf_debug_loc_dwo) sect_type = eSectionTypeDWARFDebugLoc; 1753 else if (name == g_sect_name_dwarf_debug_str_dwo) sect_type = eSectionTypeDWARFDebugStr; 1754 else if (name == g_sect_name_dwarf_debug_str_offsets_dwo) sect_type = eSectionTypeDWARFDebugStrOffsets; 1755 else if (name == g_sect_name_eh_frame) sect_type = eSectionTypeEHFrame; 1756 1757 switch (header.sh_type) 1758 { 1759 case SHT_SYMTAB: 1760 assert (sect_type == eSectionTypeOther); 1761 sect_type = eSectionTypeELFSymbolTable; 1762 break; 1763 case SHT_DYNSYM: 1764 assert (sect_type == eSectionTypeOther); 1765 sect_type = eSectionTypeELFDynamicSymbols; 1766 break; 1767 case SHT_RELA: 1768 case SHT_REL: 1769 assert (sect_type == eSectionTypeOther); 1770 sect_type = eSectionTypeELFRelocationEntries; 1771 break; 1772 case SHT_DYNAMIC: 1773 assert (sect_type == eSectionTypeOther); 1774 sect_type = eSectionTypeELFDynamicLinkInfo; 1775 break; 1776 } 1777 1778 if (eSectionTypeOther == sect_type) 1779 { 1780 // the kalimba toolchain assumes that ELF section names are free-form. It does 1781 // support linkscripts which (can) give rise to various arbitrarily named 1782 // sections being "Code" or "Data". 1783 sect_type = kalimbaSectionType(m_header, header); 1784 } 1785 1786 const uint32_t target_bytes_size = 1787 (eSectionTypeData == sect_type || eSectionTypeZeroFill == sect_type) ? 1788 m_arch_spec.GetDataByteSize() : 1789 eSectionTypeCode == sect_type ? 1790 m_arch_spec.GetCodeByteSize() : 1; 1791 1792 elf::elf_xword log2align = (header.sh_addralign==0) 1793 ? 0 1794 : llvm::Log2_64(header.sh_addralign); 1795 SectionSP section_sp (new Section(GetModule(), // Module to which this section belongs. 1796 this, // ObjectFile to which this section belongs and should read section data from. 1797 SectionIndex(I), // Section ID. 1798 name, // Section name. 1799 sect_type, // Section type. 1800 header.sh_addr, // VM address. 1801 vm_size, // VM size in bytes of this section. 1802 header.sh_offset, // Offset of this section in the file. 1803 file_size, // Size of the section as found in the file. 1804 log2align, // Alignment of the section 1805 header.sh_flags, // Flags for this section. 1806 target_bytes_size));// Number of host bytes per target byte 1807 1808 if (is_thread_specific) 1809 section_sp->SetIsThreadSpecific (is_thread_specific); 1810 m_sections_ap->AddSection(section_sp); 1811 } 1812 } 1813 1814 if (m_sections_ap.get()) 1815 { 1816 if (GetType() == eTypeDebugInfo) 1817 { 1818 static const SectionType g_sections[] = 1819 { 1820 eSectionTypeDWARFDebugAbbrev, 1821 eSectionTypeDWARFDebugAddr, 1822 eSectionTypeDWARFDebugAranges, 1823 eSectionTypeDWARFDebugFrame, 1824 eSectionTypeDWARFDebugInfo, 1825 eSectionTypeDWARFDebugLine, 1826 eSectionTypeDWARFDebugLoc, 1827 eSectionTypeDWARFDebugMacInfo, 1828 eSectionTypeDWARFDebugPubNames, 1829 eSectionTypeDWARFDebugPubTypes, 1830 eSectionTypeDWARFDebugRanges, 1831 eSectionTypeDWARFDebugStr, 1832 eSectionTypeDWARFDebugStrOffsets, 1833 eSectionTypeELFSymbolTable, 1834 }; 1835 SectionList *elf_section_list = m_sections_ap.get(); 1836 for (size_t idx = 0; idx < sizeof(g_sections) / sizeof(g_sections[0]); ++idx) 1837 { 1838 SectionType section_type = g_sections[idx]; 1839 SectionSP section_sp (elf_section_list->FindSectionByType (section_type, true)); 1840 if (section_sp) 1841 { 1842 SectionSP module_section_sp (unified_section_list.FindSectionByType (section_type, true)); 1843 if (module_section_sp) 1844 unified_section_list.ReplaceSection (module_section_sp->GetID(), section_sp); 1845 else 1846 unified_section_list.AddSection (section_sp); 1847 } 1848 } 1849 } 1850 else 1851 { 1852 unified_section_list = *m_sections_ap; 1853 } 1854 } 1855 } 1856 1857 // private 1858 unsigned 1859 ObjectFileELF::ParseSymbols (Symtab *symtab, 1860 user_id_t start_id, 1861 SectionList *section_list, 1862 const size_t num_symbols, 1863 const DataExtractor &symtab_data, 1864 const DataExtractor &strtab_data) 1865 { 1866 ELFSymbol symbol; 1867 lldb::offset_t offset = 0; 1868 1869 static ConstString text_section_name(".text"); 1870 static ConstString init_section_name(".init"); 1871 static ConstString fini_section_name(".fini"); 1872 static ConstString ctors_section_name(".ctors"); 1873 static ConstString dtors_section_name(".dtors"); 1874 1875 static ConstString data_section_name(".data"); 1876 static ConstString rodata_section_name(".rodata"); 1877 static ConstString rodata1_section_name(".rodata1"); 1878 static ConstString data2_section_name(".data1"); 1879 static ConstString bss_section_name(".bss"); 1880 static ConstString opd_section_name(".opd"); // For ppc64 1881 1882 // On Android the oatdata and the oatexec symbols in system@[email protected] covers the full 1883 // .text section what causes issues with displaying unusable symbol name to the user and very 1884 // slow unwinding speed because the instruction emulation based unwind plans try to emulate all 1885 // instructions in these symbols. Don't add these symbols to the symbol list as they have no 1886 // use for the debugger and they are causing a lot of trouble. 1887 // Filtering can't be restricted to Android because this special object file don't contain the 1888 // note section specifying the environment to Android but the custom extension and file name 1889 // makes it highly unlikely that this will collide with anything else. 1890 bool skip_oatdata_oatexec = m_file.GetFilename() == ConstString("system@[email protected]"); 1891 1892 unsigned i; 1893 for (i = 0; i < num_symbols; ++i) 1894 { 1895 if (symbol.Parse(symtab_data, &offset) == false) 1896 break; 1897 1898 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 1899 1900 // No need to add non-section symbols that have no names 1901 if (symbol.getType() != STT_SECTION && 1902 (symbol_name == NULL || symbol_name[0] == '\0')) 1903 continue; 1904 1905 // Skipping oatdata and oatexec sections if it is requested. See details above the 1906 // definition of skip_oatdata_oatexec for the reasons. 1907 if (skip_oatdata_oatexec && (::strcmp(symbol_name, "oatdata") == 0 || ::strcmp(symbol_name, "oatexec") == 0)) 1908 continue; 1909 1910 SectionSP symbol_section_sp; 1911 SymbolType symbol_type = eSymbolTypeInvalid; 1912 Elf64_Half symbol_idx = symbol.st_shndx; 1913 1914 switch (symbol_idx) 1915 { 1916 case SHN_ABS: 1917 symbol_type = eSymbolTypeAbsolute; 1918 break; 1919 case SHN_UNDEF: 1920 symbol_type = eSymbolTypeUndefined; 1921 break; 1922 default: 1923 symbol_section_sp = section_list->GetSectionAtIndex(symbol_idx); 1924 break; 1925 } 1926 1927 // If a symbol is undefined do not process it further even if it has a STT type 1928 if (symbol_type != eSymbolTypeUndefined) 1929 { 1930 switch (symbol.getType()) 1931 { 1932 default: 1933 case STT_NOTYPE: 1934 // The symbol's type is not specified. 1935 break; 1936 1937 case STT_OBJECT: 1938 // The symbol is associated with a data object, such as a variable, 1939 // an array, etc. 1940 symbol_type = eSymbolTypeData; 1941 break; 1942 1943 case STT_FUNC: 1944 // The symbol is associated with a function or other executable code. 1945 symbol_type = eSymbolTypeCode; 1946 break; 1947 1948 case STT_SECTION: 1949 // The symbol is associated with a section. Symbol table entries of 1950 // this type exist primarily for relocation and normally have 1951 // STB_LOCAL binding. 1952 break; 1953 1954 case STT_FILE: 1955 // Conventionally, the symbol's name gives the name of the source 1956 // file associated with the object file. A file symbol has STB_LOCAL 1957 // binding, its section index is SHN_ABS, and it precedes the other 1958 // STB_LOCAL symbols for the file, if it is present. 1959 symbol_type = eSymbolTypeSourceFile; 1960 break; 1961 1962 case STT_GNU_IFUNC: 1963 // The symbol is associated with an indirect function. The actual 1964 // function will be resolved if it is referenced. 1965 symbol_type = eSymbolTypeResolver; 1966 break; 1967 } 1968 } 1969 1970 if (symbol_type == eSymbolTypeInvalid) 1971 { 1972 if (symbol_section_sp) 1973 { 1974 const ConstString §_name = symbol_section_sp->GetName(); 1975 if (sect_name == text_section_name || 1976 sect_name == init_section_name || 1977 sect_name == fini_section_name || 1978 sect_name == ctors_section_name || 1979 sect_name == dtors_section_name) 1980 { 1981 symbol_type = eSymbolTypeCode; 1982 } 1983 else if (sect_name == data_section_name || 1984 sect_name == data2_section_name || 1985 sect_name == rodata_section_name || 1986 sect_name == rodata1_section_name || 1987 sect_name == bss_section_name) 1988 { 1989 symbol_type = eSymbolTypeData; 1990 } 1991 } 1992 } 1993 1994 int64_t symbol_value_offset = 0; 1995 uint32_t additional_flags = 0; 1996 1997 ArchSpec arch; 1998 if (GetArchitecture(arch)) 1999 { 2000 if (arch.GetMachine() == llvm::Triple::arm) 2001 { 2002 if (symbol.getBinding() == STB_LOCAL && symbol_name && symbol_name[0] == '$') 2003 { 2004 // These are reserved for the specification (e.g.: mapping 2005 // symbols). We don't want to add them to the symbol table. 2006 2007 if (symbol_type == eSymbolTypeCode) 2008 { 2009 llvm::StringRef symbol_name_ref(symbol_name); 2010 if (symbol_name_ref == "$a" || symbol_name_ref.startswith("$a.")) 2011 { 2012 // $a[.<any>]* - marks an ARM instruction sequence 2013 m_address_class_map[symbol.st_value] = eAddressClassCode; 2014 } 2015 else if (symbol_name_ref == "$b" || symbol_name_ref.startswith("$b.") || 2016 symbol_name_ref == "$t" || symbol_name_ref.startswith("$t.")) 2017 { 2018 // $b[.<any>]* - marks a THUMB BL instruction sequence 2019 // $t[.<any>]* - marks a THUMB instruction sequence 2020 m_address_class_map[symbol.st_value] = eAddressClassCodeAlternateISA; 2021 } 2022 else if (symbol_name_ref == "$d" || symbol_name_ref.startswith("$d.")) 2023 { 2024 // $d[.<any>]* - marks a data item sequence (e.g. lit pool) 2025 m_address_class_map[symbol.st_value] = eAddressClassData; 2026 } 2027 } 2028 continue; 2029 } 2030 } 2031 else if (arch.GetMachine() == llvm::Triple::aarch64) 2032 { 2033 if (symbol.getBinding() == STB_LOCAL && symbol_name && symbol_name[0] == '$') 2034 { 2035 // These are reserved for the specification (e.g.: mapping 2036 // symbols). We don't want to add them to the symbol table. 2037 2038 if (symbol_type == eSymbolTypeCode) 2039 { 2040 llvm::StringRef symbol_name_ref(symbol_name); 2041 if (symbol_name_ref == "$x" || symbol_name_ref.startswith("$x.")) 2042 { 2043 // $x[.<any>]* - marks an A64 instruction sequence 2044 m_address_class_map[symbol.st_value] = eAddressClassCode; 2045 } 2046 else if (symbol_name_ref == "$d" || symbol_name_ref.startswith("$d.")) 2047 { 2048 // $d[.<any>]* - marks a data item sequence (e.g. lit pool) 2049 m_address_class_map[symbol.st_value] = eAddressClassData; 2050 } 2051 } 2052 2053 continue; 2054 } 2055 } 2056 2057 if (arch.GetMachine() == llvm::Triple::arm) 2058 { 2059 if (symbol_type == eSymbolTypeCode) 2060 { 2061 if (symbol.st_value & 1) 2062 { 2063 // Subtracting 1 from the address effectively unsets 2064 // the low order bit, which results in the address 2065 // actually pointing to the beginning of the symbol. 2066 // This delta will be used below in conjunction with 2067 // symbol.st_value to produce the final symbol_value 2068 // that we store in the symtab. 2069 symbol_value_offset = -1; 2070 additional_flags = ARM_ELF_SYM_IS_THUMB; 2071 m_address_class_map[symbol.st_value^1] = eAddressClassCodeAlternateISA; 2072 } 2073 else 2074 { 2075 // This address is ARM 2076 m_address_class_map[symbol.st_value] = eAddressClassCode; 2077 } 2078 } 2079 } 2080 } 2081 2082 // symbol_value_offset may contain 0 for ARM symbols or -1 for 2083 // THUMB symbols. See above for more details. 2084 uint64_t symbol_value = symbol.st_value + symbol_value_offset; 2085 if (symbol_section_sp && CalculateType() != ObjectFile::Type::eTypeObjectFile) 2086 symbol_value -= symbol_section_sp->GetFileAddress(); 2087 2088 if (symbol_section_sp) 2089 { 2090 ModuleSP module_sp(GetModule()); 2091 if (module_sp) 2092 { 2093 SectionList *module_section_list = module_sp->GetSectionList(); 2094 if (module_section_list && module_section_list != section_list) 2095 { 2096 const ConstString §_name = symbol_section_sp->GetName(); 2097 lldb::SectionSP section_sp (module_section_list->FindSectionByName (sect_name)); 2098 if (section_sp && section_sp->GetFileSize()) 2099 { 2100 symbol_section_sp = section_sp; 2101 } 2102 } 2103 } 2104 } 2105 2106 bool is_global = symbol.getBinding() == STB_GLOBAL; 2107 uint32_t flags = symbol.st_other << 8 | symbol.st_info | additional_flags; 2108 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 2109 2110 llvm::StringRef symbol_ref(symbol_name); 2111 2112 // Symbol names may contain @VERSION suffixes. Find those and strip them temporarily. 2113 size_t version_pos = symbol_ref.find('@'); 2114 bool has_suffix = version_pos != llvm::StringRef::npos; 2115 llvm::StringRef symbol_bare = symbol_ref.substr(0, version_pos); 2116 Mangled mangled(ConstString(symbol_bare), is_mangled); 2117 2118 // Now append the suffix back to mangled and unmangled names. Only do it if the 2119 // demangling was successful (string is not empty). 2120 if (has_suffix) 2121 { 2122 llvm::StringRef suffix = symbol_ref.substr(version_pos); 2123 2124 llvm::StringRef mangled_name = mangled.GetMangledName().GetStringRef(); 2125 if (! mangled_name.empty()) 2126 mangled.SetMangledName( ConstString((mangled_name + suffix).str()) ); 2127 2128 ConstString demangled = mangled.GetDemangledName(lldb::eLanguageTypeUnknown); 2129 llvm::StringRef demangled_name = demangled.GetStringRef(); 2130 if (!demangled_name.empty()) 2131 mangled.SetDemangledName( ConstString((demangled_name + suffix).str()) ); 2132 } 2133 2134 Symbol dc_symbol( 2135 i + start_id, // ID is the original symbol table index. 2136 mangled, 2137 symbol_type, // Type of this symbol 2138 is_global, // Is this globally visible? 2139 false, // Is this symbol debug info? 2140 false, // Is this symbol a trampoline? 2141 false, // Is this symbol artificial? 2142 AddressRange( 2143 symbol_section_sp, // Section in which this symbol is defined or null. 2144 symbol_value, // Offset in section or symbol value. 2145 symbol.st_size), // Size in bytes of this symbol. 2146 symbol.st_size != 0, // Size is valid if it is not 0 2147 has_suffix, // Contains linker annotations? 2148 flags); // Symbol flags. 2149 symtab->AddSymbol(dc_symbol); 2150 } 2151 return i; 2152 } 2153 2154 unsigned 2155 ObjectFileELF::ParseSymbolTable(Symtab *symbol_table, user_id_t start_id, lldb_private::Section *symtab) 2156 { 2157 if (symtab->GetObjectFile() != this) 2158 { 2159 // If the symbol table section is owned by a different object file, have it do the 2160 // parsing. 2161 ObjectFileELF *obj_file_elf = static_cast<ObjectFileELF *>(symtab->GetObjectFile()); 2162 return obj_file_elf->ParseSymbolTable (symbol_table, start_id, symtab); 2163 } 2164 2165 // Get section list for this object file. 2166 SectionList *section_list = m_sections_ap.get(); 2167 if (!section_list) 2168 return 0; 2169 2170 user_id_t symtab_id = symtab->GetID(); 2171 const ELFSectionHeaderInfo *symtab_hdr = GetSectionHeaderByIndex(symtab_id); 2172 assert(symtab_hdr->sh_type == SHT_SYMTAB || 2173 symtab_hdr->sh_type == SHT_DYNSYM); 2174 2175 // sh_link: section header index of associated string table. 2176 // Section ID's are ones based. 2177 user_id_t strtab_id = symtab_hdr->sh_link + 1; 2178 Section *strtab = section_list->FindSectionByID(strtab_id).get(); 2179 2180 if (symtab && strtab) 2181 { 2182 assert (symtab->GetObjectFile() == this); 2183 assert (strtab->GetObjectFile() == this); 2184 2185 DataExtractor symtab_data; 2186 DataExtractor strtab_data; 2187 if (ReadSectionData(symtab, symtab_data) && 2188 ReadSectionData(strtab, strtab_data)) 2189 { 2190 size_t num_symbols = symtab_data.GetByteSize() / symtab_hdr->sh_entsize; 2191 2192 return ParseSymbols(symbol_table, start_id, section_list, 2193 num_symbols, symtab_data, strtab_data); 2194 } 2195 } 2196 2197 return 0; 2198 } 2199 2200 size_t 2201 ObjectFileELF::ParseDynamicSymbols() 2202 { 2203 if (m_dynamic_symbols.size()) 2204 return m_dynamic_symbols.size(); 2205 2206 SectionList *section_list = GetSectionList(); 2207 if (!section_list) 2208 return 0; 2209 2210 // Find the SHT_DYNAMIC section. 2211 Section *dynsym = section_list->FindSectionByType (eSectionTypeELFDynamicLinkInfo, true).get(); 2212 if (!dynsym) 2213 return 0; 2214 assert (dynsym->GetObjectFile() == this); 2215 2216 ELFDynamic symbol; 2217 DataExtractor dynsym_data; 2218 if (ReadSectionData(dynsym, dynsym_data)) 2219 { 2220 const lldb::offset_t section_size = dynsym_data.GetByteSize(); 2221 lldb::offset_t cursor = 0; 2222 2223 while (cursor < section_size) 2224 { 2225 if (!symbol.Parse(dynsym_data, &cursor)) 2226 break; 2227 2228 m_dynamic_symbols.push_back(symbol); 2229 } 2230 } 2231 2232 return m_dynamic_symbols.size(); 2233 } 2234 2235 const ELFDynamic * 2236 ObjectFileELF::FindDynamicSymbol(unsigned tag) 2237 { 2238 if (!ParseDynamicSymbols()) 2239 return NULL; 2240 2241 DynamicSymbolCollIter I = m_dynamic_symbols.begin(); 2242 DynamicSymbolCollIter E = m_dynamic_symbols.end(); 2243 for ( ; I != E; ++I) 2244 { 2245 ELFDynamic *symbol = &*I; 2246 2247 if (symbol->d_tag == tag) 2248 return symbol; 2249 } 2250 2251 return NULL; 2252 } 2253 2254 unsigned 2255 ObjectFileELF::PLTRelocationType() 2256 { 2257 // DT_PLTREL 2258 // This member specifies the type of relocation entry to which the 2259 // procedure linkage table refers. The d_val member holds DT_REL or 2260 // DT_RELA, as appropriate. All relocations in a procedure linkage table 2261 // must use the same relocation. 2262 const ELFDynamic *symbol = FindDynamicSymbol(DT_PLTREL); 2263 2264 if (symbol) 2265 return symbol->d_val; 2266 2267 return 0; 2268 } 2269 2270 // Returns the size of the normal plt entries and the offset of the first normal plt entry. The 2271 // 0th entry in the plt table is usually a resolution entry which have different size in some 2272 // architectures then the rest of the plt entries. 2273 static std::pair<uint64_t, uint64_t> 2274 GetPltEntrySizeAndOffset(const ELFSectionHeader* rel_hdr, const ELFSectionHeader* plt_hdr) 2275 { 2276 const elf_xword num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 2277 2278 // Clang 3.3 sets entsize to 4 for 32-bit binaries, but the plt entries are 16 bytes. 2279 // So round the entsize up by the alignment if addralign is set. 2280 elf_xword plt_entsize = plt_hdr->sh_addralign ? 2281 llvm::RoundUpToAlignment (plt_hdr->sh_entsize, plt_hdr->sh_addralign) : plt_hdr->sh_entsize; 2282 2283 if (plt_entsize == 0) 2284 { 2285 // The linker haven't set the plt_hdr->sh_entsize field. Try to guess the size of the plt 2286 // entries based on the number of entries and the size of the plt section with the 2287 // assumption that the size of the 0th entry is at least as big as the size of the normal 2288 // entries and it isn't much bigger then that. 2289 if (plt_hdr->sh_addralign) 2290 plt_entsize = plt_hdr->sh_size / plt_hdr->sh_addralign / (num_relocations + 1) * plt_hdr->sh_addralign; 2291 else 2292 plt_entsize = plt_hdr->sh_size / (num_relocations + 1); 2293 } 2294 2295 elf_xword plt_offset = plt_hdr->sh_size - num_relocations * plt_entsize; 2296 2297 return std::make_pair(plt_entsize, plt_offset); 2298 } 2299 2300 static unsigned 2301 ParsePLTRelocations(Symtab *symbol_table, 2302 user_id_t start_id, 2303 unsigned rel_type, 2304 const ELFHeader *hdr, 2305 const ELFSectionHeader *rel_hdr, 2306 const ELFSectionHeader *plt_hdr, 2307 const ELFSectionHeader *sym_hdr, 2308 const lldb::SectionSP &plt_section_sp, 2309 DataExtractor &rel_data, 2310 DataExtractor &symtab_data, 2311 DataExtractor &strtab_data) 2312 { 2313 ELFRelocation rel(rel_type); 2314 ELFSymbol symbol; 2315 lldb::offset_t offset = 0; 2316 2317 uint64_t plt_offset, plt_entsize; 2318 std::tie(plt_entsize, plt_offset) = GetPltEntrySizeAndOffset(rel_hdr, plt_hdr); 2319 const elf_xword num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 2320 2321 typedef unsigned (*reloc_info_fn)(const ELFRelocation &rel); 2322 reloc_info_fn reloc_type; 2323 reloc_info_fn reloc_symbol; 2324 2325 if (hdr->Is32Bit()) 2326 { 2327 reloc_type = ELFRelocation::RelocType32; 2328 reloc_symbol = ELFRelocation::RelocSymbol32; 2329 } 2330 else 2331 { 2332 reloc_type = ELFRelocation::RelocType64; 2333 reloc_symbol = ELFRelocation::RelocSymbol64; 2334 } 2335 2336 unsigned slot_type = hdr->GetRelocationJumpSlotType(); 2337 unsigned i; 2338 for (i = 0; i < num_relocations; ++i) 2339 { 2340 if (rel.Parse(rel_data, &offset) == false) 2341 break; 2342 2343 if (reloc_type(rel) != slot_type) 2344 continue; 2345 2346 lldb::offset_t symbol_offset = reloc_symbol(rel) * sym_hdr->sh_entsize; 2347 if (!symbol.Parse(symtab_data, &symbol_offset)) 2348 break; 2349 2350 const char *symbol_name = strtab_data.PeekCStr(symbol.st_name); 2351 bool is_mangled = symbol_name ? (symbol_name[0] == '_' && symbol_name[1] == 'Z') : false; 2352 uint64_t plt_index = plt_offset + i * plt_entsize; 2353 2354 Symbol jump_symbol( 2355 i + start_id, // Symbol table index 2356 symbol_name, // symbol name. 2357 is_mangled, // is the symbol name mangled? 2358 eSymbolTypeTrampoline, // Type of this symbol 2359 false, // Is this globally visible? 2360 false, // Is this symbol debug info? 2361 true, // Is this symbol a trampoline? 2362 true, // Is this symbol artificial? 2363 plt_section_sp, // Section in which this symbol is defined or null. 2364 plt_index, // Offset in section or symbol value. 2365 plt_entsize, // Size in bytes of this symbol. 2366 true, // Size is valid 2367 false, // Contains linker annotations? 2368 0); // Symbol flags. 2369 2370 symbol_table->AddSymbol(jump_symbol); 2371 } 2372 2373 return i; 2374 } 2375 2376 unsigned 2377 ObjectFileELF::ParseTrampolineSymbols(Symtab *symbol_table, 2378 user_id_t start_id, 2379 const ELFSectionHeaderInfo *rel_hdr, 2380 user_id_t rel_id) 2381 { 2382 assert(rel_hdr->sh_type == SHT_RELA || rel_hdr->sh_type == SHT_REL); 2383 2384 // The link field points to the associated symbol table. The info field 2385 // points to the section holding the plt. 2386 user_id_t symtab_id = rel_hdr->sh_link; 2387 user_id_t plt_id = rel_hdr->sh_info; 2388 2389 // If the link field doesn't point to the appropriate symbol name table then 2390 // try to find it by name as some compiler don't fill in the link fields. 2391 if (!symtab_id) 2392 symtab_id = GetSectionIndexByName(".dynsym"); 2393 if (!plt_id) 2394 plt_id = GetSectionIndexByName(".plt"); 2395 2396 if (!symtab_id || !plt_id) 2397 return 0; 2398 2399 // Section ID's are ones based; 2400 symtab_id++; 2401 plt_id++; 2402 2403 const ELFSectionHeaderInfo *plt_hdr = GetSectionHeaderByIndex(plt_id); 2404 if (!plt_hdr) 2405 return 0; 2406 2407 const ELFSectionHeaderInfo *sym_hdr = GetSectionHeaderByIndex(symtab_id); 2408 if (!sym_hdr) 2409 return 0; 2410 2411 SectionList *section_list = m_sections_ap.get(); 2412 if (!section_list) 2413 return 0; 2414 2415 Section *rel_section = section_list->FindSectionByID(rel_id).get(); 2416 if (!rel_section) 2417 return 0; 2418 2419 SectionSP plt_section_sp (section_list->FindSectionByID(plt_id)); 2420 if (!plt_section_sp) 2421 return 0; 2422 2423 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 2424 if (!symtab) 2425 return 0; 2426 2427 // sh_link points to associated string table. 2428 Section *strtab = section_list->FindSectionByID(sym_hdr->sh_link + 1).get(); 2429 if (!strtab) 2430 return 0; 2431 2432 DataExtractor rel_data; 2433 if (!ReadSectionData(rel_section, rel_data)) 2434 return 0; 2435 2436 DataExtractor symtab_data; 2437 if (!ReadSectionData(symtab, symtab_data)) 2438 return 0; 2439 2440 DataExtractor strtab_data; 2441 if (!ReadSectionData(strtab, strtab_data)) 2442 return 0; 2443 2444 unsigned rel_type = PLTRelocationType(); 2445 if (!rel_type) 2446 return 0; 2447 2448 return ParsePLTRelocations (symbol_table, 2449 start_id, 2450 rel_type, 2451 &m_header, 2452 rel_hdr, 2453 plt_hdr, 2454 sym_hdr, 2455 plt_section_sp, 2456 rel_data, 2457 symtab_data, 2458 strtab_data); 2459 } 2460 2461 unsigned 2462 ObjectFileELF::RelocateSection(Symtab* symtab, const ELFHeader *hdr, const ELFSectionHeader *rel_hdr, 2463 const ELFSectionHeader *symtab_hdr, const ELFSectionHeader *debug_hdr, 2464 DataExtractor &rel_data, DataExtractor &symtab_data, 2465 DataExtractor &debug_data, Section* rel_section) 2466 { 2467 ELFRelocation rel(rel_hdr->sh_type); 2468 lldb::addr_t offset = 0; 2469 const unsigned num_relocations = rel_hdr->sh_size / rel_hdr->sh_entsize; 2470 typedef unsigned (*reloc_info_fn)(const ELFRelocation &rel); 2471 reloc_info_fn reloc_type; 2472 reloc_info_fn reloc_symbol; 2473 2474 if (hdr->Is32Bit()) 2475 { 2476 reloc_type = ELFRelocation::RelocType32; 2477 reloc_symbol = ELFRelocation::RelocSymbol32; 2478 } 2479 else 2480 { 2481 reloc_type = ELFRelocation::RelocType64; 2482 reloc_symbol = ELFRelocation::RelocSymbol64; 2483 } 2484 2485 for (unsigned i = 0; i < num_relocations; ++i) 2486 { 2487 if (rel.Parse(rel_data, &offset) == false) 2488 break; 2489 2490 Symbol* symbol = NULL; 2491 2492 if (hdr->Is32Bit()) 2493 { 2494 switch (reloc_type(rel)) { 2495 case R_386_32: 2496 case R_386_PC32: 2497 default: 2498 assert(false && "unexpected relocation type"); 2499 } 2500 } else { 2501 switch (reloc_type(rel)) { 2502 case R_X86_64_64: 2503 { 2504 symbol = symtab->FindSymbolByID(reloc_symbol(rel)); 2505 if (symbol) 2506 { 2507 addr_t value = symbol->GetAddressRef().GetFileAddress(); 2508 DataBufferSP& data_buffer_sp = debug_data.GetSharedDataBuffer(); 2509 uint64_t* dst = reinterpret_cast<uint64_t*>(data_buffer_sp->GetBytes() + rel_section->GetFileOffset() + ELFRelocation::RelocOffset64(rel)); 2510 *dst = value + ELFRelocation::RelocAddend64(rel); 2511 } 2512 break; 2513 } 2514 case R_X86_64_32: 2515 case R_X86_64_32S: 2516 { 2517 symbol = symtab->FindSymbolByID(reloc_symbol(rel)); 2518 if (symbol) 2519 { 2520 addr_t value = symbol->GetAddressRef().GetFileAddress(); 2521 value += ELFRelocation::RelocAddend32(rel); 2522 assert((reloc_type(rel) == R_X86_64_32 && (value <= UINT32_MAX)) || 2523 (reloc_type(rel) == R_X86_64_32S && 2524 ((int64_t)value <= INT32_MAX && (int64_t)value >= INT32_MIN))); 2525 uint32_t truncated_addr = (value & 0xFFFFFFFF); 2526 DataBufferSP& data_buffer_sp = debug_data.GetSharedDataBuffer(); 2527 uint32_t* dst = reinterpret_cast<uint32_t*>(data_buffer_sp->GetBytes() + rel_section->GetFileOffset() + ELFRelocation::RelocOffset32(rel)); 2528 *dst = truncated_addr; 2529 } 2530 break; 2531 } 2532 case R_X86_64_PC32: 2533 default: 2534 assert(false && "unexpected relocation type"); 2535 } 2536 } 2537 } 2538 2539 return 0; 2540 } 2541 2542 unsigned 2543 ObjectFileELF::RelocateDebugSections(const ELFSectionHeader *rel_hdr, user_id_t rel_id) 2544 { 2545 assert(rel_hdr->sh_type == SHT_RELA || rel_hdr->sh_type == SHT_REL); 2546 2547 // Parse in the section list if needed. 2548 SectionList *section_list = GetSectionList(); 2549 if (!section_list) 2550 return 0; 2551 2552 // Section ID's are ones based. 2553 user_id_t symtab_id = rel_hdr->sh_link + 1; 2554 user_id_t debug_id = rel_hdr->sh_info + 1; 2555 2556 const ELFSectionHeader *symtab_hdr = GetSectionHeaderByIndex(symtab_id); 2557 if (!symtab_hdr) 2558 return 0; 2559 2560 const ELFSectionHeader *debug_hdr = GetSectionHeaderByIndex(debug_id); 2561 if (!debug_hdr) 2562 return 0; 2563 2564 Section *rel = section_list->FindSectionByID(rel_id).get(); 2565 if (!rel) 2566 return 0; 2567 2568 Section *symtab = section_list->FindSectionByID(symtab_id).get(); 2569 if (!symtab) 2570 return 0; 2571 2572 Section *debug = section_list->FindSectionByID(debug_id).get(); 2573 if (!debug) 2574 return 0; 2575 2576 DataExtractor rel_data; 2577 DataExtractor symtab_data; 2578 DataExtractor debug_data; 2579 2580 if (ReadSectionData(rel, rel_data) && 2581 ReadSectionData(symtab, symtab_data) && 2582 ReadSectionData(debug, debug_data)) 2583 { 2584 RelocateSection(m_symtab_ap.get(), &m_header, rel_hdr, symtab_hdr, debug_hdr, 2585 rel_data, symtab_data, debug_data, debug); 2586 } 2587 2588 return 0; 2589 } 2590 2591 Symtab * 2592 ObjectFileELF::GetSymtab() 2593 { 2594 ModuleSP module_sp(GetModule()); 2595 if (!module_sp) 2596 return NULL; 2597 2598 // We always want to use the main object file so we (hopefully) only have one cached copy 2599 // of our symtab, dynamic sections, etc. 2600 ObjectFile *module_obj_file = module_sp->GetObjectFile(); 2601 if (module_obj_file && module_obj_file != this) 2602 return module_obj_file->GetSymtab(); 2603 2604 if (m_symtab_ap.get() == NULL) 2605 { 2606 SectionList *section_list = module_sp->GetSectionList(); 2607 if (!section_list) 2608 return NULL; 2609 2610 uint64_t symbol_id = 0; 2611 lldb_private::Mutex::Locker locker(module_sp->GetMutex()); 2612 2613 // Sharable objects and dynamic executables usually have 2 distinct symbol 2614 // tables, one named ".symtab", and the other ".dynsym". The dynsym is a smaller 2615 // version of the symtab that only contains global symbols. The information found 2616 // in the dynsym is therefore also found in the symtab, while the reverse is not 2617 // necessarily true. 2618 Section *symtab = section_list->FindSectionByType (eSectionTypeELFSymbolTable, true).get(); 2619 if (!symtab) 2620 { 2621 // The symtab section is non-allocable and can be stripped, so if it doesn't exist 2622 // then use the dynsym section which should always be there. 2623 symtab = section_list->FindSectionByType (eSectionTypeELFDynamicSymbols, true).get(); 2624 } 2625 if (symtab) 2626 { 2627 m_symtab_ap.reset(new Symtab(symtab->GetObjectFile())); 2628 symbol_id += ParseSymbolTable (m_symtab_ap.get(), symbol_id, symtab); 2629 } 2630 2631 // DT_JMPREL 2632 // If present, this entry's d_ptr member holds the address of relocation 2633 // entries associated solely with the procedure linkage table. Separating 2634 // these relocation entries lets the dynamic linker ignore them during 2635 // process initialization, if lazy binding is enabled. If this entry is 2636 // present, the related entries of types DT_PLTRELSZ and DT_PLTREL must 2637 // also be present. 2638 const ELFDynamic *symbol = FindDynamicSymbol(DT_JMPREL); 2639 if (symbol) 2640 { 2641 // Synthesize trampoline symbols to help navigate the PLT. 2642 addr_t addr = symbol->d_ptr; 2643 Section *reloc_section = section_list->FindSectionContainingFileAddress(addr).get(); 2644 if (reloc_section) 2645 { 2646 user_id_t reloc_id = reloc_section->GetID(); 2647 const ELFSectionHeaderInfo *reloc_header = GetSectionHeaderByIndex(reloc_id); 2648 assert(reloc_header); 2649 2650 if (m_symtab_ap == nullptr) 2651 m_symtab_ap.reset(new Symtab(reloc_section->GetObjectFile())); 2652 2653 ParseTrampolineSymbols (m_symtab_ap.get(), symbol_id, reloc_header, reloc_id); 2654 } 2655 } 2656 2657 // If we still don't have any symtab then create an empty instance to avoid do the section 2658 // lookup next time. 2659 if (m_symtab_ap == nullptr) 2660 m_symtab_ap.reset(new Symtab(this)); 2661 2662 m_symtab_ap->CalculateSymbolSizes(); 2663 } 2664 2665 for (SectionHeaderCollIter I = m_section_headers.begin(); 2666 I != m_section_headers.end(); ++I) 2667 { 2668 if (I->sh_type == SHT_RELA || I->sh_type == SHT_REL) 2669 { 2670 if (CalculateType() == eTypeObjectFile) 2671 { 2672 const char *section_name = I->section_name.AsCString(""); 2673 if (strstr(section_name, ".rela.debug") || 2674 strstr(section_name, ".rel.debug")) 2675 { 2676 const ELFSectionHeader &reloc_header = *I; 2677 user_id_t reloc_id = SectionIndex(I); 2678 RelocateDebugSections(&reloc_header, reloc_id); 2679 } 2680 } 2681 } 2682 } 2683 return m_symtab_ap.get(); 2684 } 2685 2686 Symbol * 2687 ObjectFileELF::ResolveSymbolForAddress(const Address& so_addr, bool verify_unique) 2688 { 2689 if (!m_symtab_ap.get()) 2690 return nullptr; // GetSymtab() should be called first. 2691 2692 const SectionList *section_list = GetSectionList(); 2693 if (!section_list) 2694 return nullptr; 2695 2696 if (DWARFCallFrameInfo *eh_frame = GetUnwindTable().GetEHFrameInfo()) 2697 { 2698 AddressRange range; 2699 if (eh_frame->GetAddressRange (so_addr, range)) 2700 { 2701 const addr_t file_addr = range.GetBaseAddress().GetFileAddress(); 2702 Symbol * symbol = verify_unique ? m_symtab_ap->FindSymbolContainingFileAddress(file_addr) : nullptr; 2703 if (symbol) 2704 return symbol; 2705 2706 // Note that a (stripped) symbol won't be found by GetSymtab()... 2707 lldb::SectionSP eh_sym_section_sp = section_list->FindSectionContainingFileAddress(file_addr); 2708 if (eh_sym_section_sp.get()) 2709 { 2710 addr_t section_base = eh_sym_section_sp->GetFileAddress(); 2711 addr_t offset = file_addr - section_base; 2712 uint64_t symbol_id = m_symtab_ap->GetNumSymbols(); 2713 2714 Symbol eh_symbol( 2715 symbol_id, // Symbol table index. 2716 "???", // Symbol name. 2717 false, // Is the symbol name mangled? 2718 eSymbolTypeCode, // Type of this symbol. 2719 true, // Is this globally visible? 2720 false, // Is this symbol debug info? 2721 false, // Is this symbol a trampoline? 2722 true, // Is this symbol artificial? 2723 eh_sym_section_sp, // Section in which this symbol is defined or null. 2724 offset, // Offset in section or symbol value. 2725 range.GetByteSize(), // Size in bytes of this symbol. 2726 true, // Size is valid. 2727 false, // Contains linker annotations? 2728 0); // Symbol flags. 2729 if (symbol_id == m_symtab_ap->AddSymbol(eh_symbol)) 2730 return m_symtab_ap->SymbolAtIndex(symbol_id); 2731 } 2732 } 2733 } 2734 return nullptr; 2735 } 2736 2737 2738 bool 2739 ObjectFileELF::IsStripped () 2740 { 2741 // TODO: determine this for ELF 2742 return false; 2743 } 2744 2745 //===----------------------------------------------------------------------===// 2746 // Dump 2747 // 2748 // Dump the specifics of the runtime file container (such as any headers 2749 // segments, sections, etc). 2750 //---------------------------------------------------------------------- 2751 void 2752 ObjectFileELF::Dump(Stream *s) 2753 { 2754 DumpELFHeader(s, m_header); 2755 s->EOL(); 2756 DumpELFProgramHeaders(s); 2757 s->EOL(); 2758 DumpELFSectionHeaders(s); 2759 s->EOL(); 2760 SectionList *section_list = GetSectionList(); 2761 if (section_list) 2762 section_list->Dump(s, NULL, true, UINT32_MAX); 2763 Symtab *symtab = GetSymtab(); 2764 if (symtab) 2765 symtab->Dump(s, NULL, eSortOrderNone); 2766 s->EOL(); 2767 DumpDependentModules(s); 2768 s->EOL(); 2769 } 2770 2771 //---------------------------------------------------------------------- 2772 // DumpELFHeader 2773 // 2774 // Dump the ELF header to the specified output stream 2775 //---------------------------------------------------------------------- 2776 void 2777 ObjectFileELF::DumpELFHeader(Stream *s, const ELFHeader &header) 2778 { 2779 s->PutCString("ELF Header\n"); 2780 s->Printf("e_ident[EI_MAG0 ] = 0x%2.2x\n", header.e_ident[EI_MAG0]); 2781 s->Printf("e_ident[EI_MAG1 ] = 0x%2.2x '%c'\n", 2782 header.e_ident[EI_MAG1], header.e_ident[EI_MAG1]); 2783 s->Printf("e_ident[EI_MAG2 ] = 0x%2.2x '%c'\n", 2784 header.e_ident[EI_MAG2], header.e_ident[EI_MAG2]); 2785 s->Printf("e_ident[EI_MAG3 ] = 0x%2.2x '%c'\n", 2786 header.e_ident[EI_MAG3], header.e_ident[EI_MAG3]); 2787 2788 s->Printf("e_ident[EI_CLASS ] = 0x%2.2x\n", header.e_ident[EI_CLASS]); 2789 s->Printf("e_ident[EI_DATA ] = 0x%2.2x ", header.e_ident[EI_DATA]); 2790 DumpELFHeader_e_ident_EI_DATA(s, header.e_ident[EI_DATA]); 2791 s->Printf ("\ne_ident[EI_VERSION] = 0x%2.2x\n", header.e_ident[EI_VERSION]); 2792 s->Printf ("e_ident[EI_PAD ] = 0x%2.2x\n", header.e_ident[EI_PAD]); 2793 2794 s->Printf("e_type = 0x%4.4x ", header.e_type); 2795 DumpELFHeader_e_type(s, header.e_type); 2796 s->Printf("\ne_machine = 0x%4.4x\n", header.e_machine); 2797 s->Printf("e_version = 0x%8.8x\n", header.e_version); 2798 s->Printf("e_entry = 0x%8.8" PRIx64 "\n", header.e_entry); 2799 s->Printf("e_phoff = 0x%8.8" PRIx64 "\n", header.e_phoff); 2800 s->Printf("e_shoff = 0x%8.8" PRIx64 "\n", header.e_shoff); 2801 s->Printf("e_flags = 0x%8.8x\n", header.e_flags); 2802 s->Printf("e_ehsize = 0x%4.4x\n", header.e_ehsize); 2803 s->Printf("e_phentsize = 0x%4.4x\n", header.e_phentsize); 2804 s->Printf("e_phnum = 0x%4.4x\n", header.e_phnum); 2805 s->Printf("e_shentsize = 0x%4.4x\n", header.e_shentsize); 2806 s->Printf("e_shnum = 0x%4.4x\n", header.e_shnum); 2807 s->Printf("e_shstrndx = 0x%4.4x\n", header.e_shstrndx); 2808 } 2809 2810 //---------------------------------------------------------------------- 2811 // DumpELFHeader_e_type 2812 // 2813 // Dump an token value for the ELF header member e_type 2814 //---------------------------------------------------------------------- 2815 void 2816 ObjectFileELF::DumpELFHeader_e_type(Stream *s, elf_half e_type) 2817 { 2818 switch (e_type) 2819 { 2820 case ET_NONE: *s << "ET_NONE"; break; 2821 case ET_REL: *s << "ET_REL"; break; 2822 case ET_EXEC: *s << "ET_EXEC"; break; 2823 case ET_DYN: *s << "ET_DYN"; break; 2824 case ET_CORE: *s << "ET_CORE"; break; 2825 default: 2826 break; 2827 } 2828 } 2829 2830 //---------------------------------------------------------------------- 2831 // DumpELFHeader_e_ident_EI_DATA 2832 // 2833 // Dump an token value for the ELF header member e_ident[EI_DATA] 2834 //---------------------------------------------------------------------- 2835 void 2836 ObjectFileELF::DumpELFHeader_e_ident_EI_DATA(Stream *s, unsigned char ei_data) 2837 { 2838 switch (ei_data) 2839 { 2840 case ELFDATANONE: *s << "ELFDATANONE"; break; 2841 case ELFDATA2LSB: *s << "ELFDATA2LSB - Little Endian"; break; 2842 case ELFDATA2MSB: *s << "ELFDATA2MSB - Big Endian"; break; 2843 default: 2844 break; 2845 } 2846 } 2847 2848 2849 //---------------------------------------------------------------------- 2850 // DumpELFProgramHeader 2851 // 2852 // Dump a single ELF program header to the specified output stream 2853 //---------------------------------------------------------------------- 2854 void 2855 ObjectFileELF::DumpELFProgramHeader(Stream *s, const ELFProgramHeader &ph) 2856 { 2857 DumpELFProgramHeader_p_type(s, ph.p_type); 2858 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64 " %8.8" PRIx64, ph.p_offset, ph.p_vaddr, ph.p_paddr); 2859 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64 " %8.8x (", ph.p_filesz, ph.p_memsz, ph.p_flags); 2860 2861 DumpELFProgramHeader_p_flags(s, ph.p_flags); 2862 s->Printf(") %8.8" PRIx64, ph.p_align); 2863 } 2864 2865 //---------------------------------------------------------------------- 2866 // DumpELFProgramHeader_p_type 2867 // 2868 // Dump an token value for the ELF program header member p_type which 2869 // describes the type of the program header 2870 // ---------------------------------------------------------------------- 2871 void 2872 ObjectFileELF::DumpELFProgramHeader_p_type(Stream *s, elf_word p_type) 2873 { 2874 const int kStrWidth = 15; 2875 switch (p_type) 2876 { 2877 CASE_AND_STREAM(s, PT_NULL , kStrWidth); 2878 CASE_AND_STREAM(s, PT_LOAD , kStrWidth); 2879 CASE_AND_STREAM(s, PT_DYNAMIC , kStrWidth); 2880 CASE_AND_STREAM(s, PT_INTERP , kStrWidth); 2881 CASE_AND_STREAM(s, PT_NOTE , kStrWidth); 2882 CASE_AND_STREAM(s, PT_SHLIB , kStrWidth); 2883 CASE_AND_STREAM(s, PT_PHDR , kStrWidth); 2884 CASE_AND_STREAM(s, PT_TLS , kStrWidth); 2885 CASE_AND_STREAM(s, PT_GNU_EH_FRAME, kStrWidth); 2886 default: 2887 s->Printf("0x%8.8x%*s", p_type, kStrWidth - 10, ""); 2888 break; 2889 } 2890 } 2891 2892 2893 //---------------------------------------------------------------------- 2894 // DumpELFProgramHeader_p_flags 2895 // 2896 // Dump an token value for the ELF program header member p_flags 2897 //---------------------------------------------------------------------- 2898 void 2899 ObjectFileELF::DumpELFProgramHeader_p_flags(Stream *s, elf_word p_flags) 2900 { 2901 *s << ((p_flags & PF_X) ? "PF_X" : " ") 2902 << (((p_flags & PF_X) && (p_flags & PF_W)) ? '+' : ' ') 2903 << ((p_flags & PF_W) ? "PF_W" : " ") 2904 << (((p_flags & PF_W) && (p_flags & PF_R)) ? '+' : ' ') 2905 << ((p_flags & PF_R) ? "PF_R" : " "); 2906 } 2907 2908 //---------------------------------------------------------------------- 2909 // DumpELFProgramHeaders 2910 // 2911 // Dump all of the ELF program header to the specified output stream 2912 //---------------------------------------------------------------------- 2913 void 2914 ObjectFileELF::DumpELFProgramHeaders(Stream *s) 2915 { 2916 if (!ParseProgramHeaders()) 2917 return; 2918 2919 s->PutCString("Program Headers\n"); 2920 s->PutCString("IDX p_type p_offset p_vaddr p_paddr " 2921 "p_filesz p_memsz p_flags p_align\n"); 2922 s->PutCString("==== --------------- -------- -------- -------- " 2923 "-------- -------- ------------------------- --------\n"); 2924 2925 uint32_t idx = 0; 2926 for (ProgramHeaderCollConstIter I = m_program_headers.begin(); 2927 I != m_program_headers.end(); ++I, ++idx) 2928 { 2929 s->Printf("[%2u] ", idx); 2930 ObjectFileELF::DumpELFProgramHeader(s, *I); 2931 s->EOL(); 2932 } 2933 } 2934 2935 //---------------------------------------------------------------------- 2936 // DumpELFSectionHeader 2937 // 2938 // Dump a single ELF section header to the specified output stream 2939 //---------------------------------------------------------------------- 2940 void 2941 ObjectFileELF::DumpELFSectionHeader(Stream *s, const ELFSectionHeaderInfo &sh) 2942 { 2943 s->Printf("%8.8x ", sh.sh_name); 2944 DumpELFSectionHeader_sh_type(s, sh.sh_type); 2945 s->Printf(" %8.8" PRIx64 " (", sh.sh_flags); 2946 DumpELFSectionHeader_sh_flags(s, sh.sh_flags); 2947 s->Printf(") %8.8" PRIx64 " %8.8" PRIx64 " %8.8" PRIx64, sh.sh_addr, sh.sh_offset, sh.sh_size); 2948 s->Printf(" %8.8x %8.8x", sh.sh_link, sh.sh_info); 2949 s->Printf(" %8.8" PRIx64 " %8.8" PRIx64, sh.sh_addralign, sh.sh_entsize); 2950 } 2951 2952 //---------------------------------------------------------------------- 2953 // DumpELFSectionHeader_sh_type 2954 // 2955 // Dump an token value for the ELF section header member sh_type which 2956 // describes the type of the section 2957 //---------------------------------------------------------------------- 2958 void 2959 ObjectFileELF::DumpELFSectionHeader_sh_type(Stream *s, elf_word sh_type) 2960 { 2961 const int kStrWidth = 12; 2962 switch (sh_type) 2963 { 2964 CASE_AND_STREAM(s, SHT_NULL , kStrWidth); 2965 CASE_AND_STREAM(s, SHT_PROGBITS , kStrWidth); 2966 CASE_AND_STREAM(s, SHT_SYMTAB , kStrWidth); 2967 CASE_AND_STREAM(s, SHT_STRTAB , kStrWidth); 2968 CASE_AND_STREAM(s, SHT_RELA , kStrWidth); 2969 CASE_AND_STREAM(s, SHT_HASH , kStrWidth); 2970 CASE_AND_STREAM(s, SHT_DYNAMIC , kStrWidth); 2971 CASE_AND_STREAM(s, SHT_NOTE , kStrWidth); 2972 CASE_AND_STREAM(s, SHT_NOBITS , kStrWidth); 2973 CASE_AND_STREAM(s, SHT_REL , kStrWidth); 2974 CASE_AND_STREAM(s, SHT_SHLIB , kStrWidth); 2975 CASE_AND_STREAM(s, SHT_DYNSYM , kStrWidth); 2976 CASE_AND_STREAM(s, SHT_LOPROC , kStrWidth); 2977 CASE_AND_STREAM(s, SHT_HIPROC , kStrWidth); 2978 CASE_AND_STREAM(s, SHT_LOUSER , kStrWidth); 2979 CASE_AND_STREAM(s, SHT_HIUSER , kStrWidth); 2980 default: 2981 s->Printf("0x%8.8x%*s", sh_type, kStrWidth - 10, ""); 2982 break; 2983 } 2984 } 2985 2986 //---------------------------------------------------------------------- 2987 // DumpELFSectionHeader_sh_flags 2988 // 2989 // Dump an token value for the ELF section header member sh_flags 2990 //---------------------------------------------------------------------- 2991 void 2992 ObjectFileELF::DumpELFSectionHeader_sh_flags(Stream *s, elf_xword sh_flags) 2993 { 2994 *s << ((sh_flags & SHF_WRITE) ? "WRITE" : " ") 2995 << (((sh_flags & SHF_WRITE) && (sh_flags & SHF_ALLOC)) ? '+' : ' ') 2996 << ((sh_flags & SHF_ALLOC) ? "ALLOC" : " ") 2997 << (((sh_flags & SHF_ALLOC) && (sh_flags & SHF_EXECINSTR)) ? '+' : ' ') 2998 << ((sh_flags & SHF_EXECINSTR) ? "EXECINSTR" : " "); 2999 } 3000 3001 //---------------------------------------------------------------------- 3002 // DumpELFSectionHeaders 3003 // 3004 // Dump all of the ELF section header to the specified output stream 3005 //---------------------------------------------------------------------- 3006 void 3007 ObjectFileELF::DumpELFSectionHeaders(Stream *s) 3008 { 3009 if (!ParseSectionHeaders()) 3010 return; 3011 3012 s->PutCString("Section Headers\n"); 3013 s->PutCString("IDX name type flags " 3014 "addr offset size link info addralgn " 3015 "entsize Name\n"); 3016 s->PutCString("==== -------- ------------ -------------------------------- " 3017 "-------- -------- -------- -------- -------- -------- " 3018 "-------- ====================\n"); 3019 3020 uint32_t idx = 0; 3021 for (SectionHeaderCollConstIter I = m_section_headers.begin(); 3022 I != m_section_headers.end(); ++I, ++idx) 3023 { 3024 s->Printf("[%2u] ", idx); 3025 ObjectFileELF::DumpELFSectionHeader(s, *I); 3026 const char* section_name = I->section_name.AsCString(""); 3027 if (section_name) 3028 *s << ' ' << section_name << "\n"; 3029 } 3030 } 3031 3032 void 3033 ObjectFileELF::DumpDependentModules(lldb_private::Stream *s) 3034 { 3035 size_t num_modules = ParseDependentModules(); 3036 3037 if (num_modules > 0) 3038 { 3039 s->PutCString("Dependent Modules:\n"); 3040 for (unsigned i = 0; i < num_modules; ++i) 3041 { 3042 const FileSpec &spec = m_filespec_ap->GetFileSpecAtIndex(i); 3043 s->Printf(" %s\n", spec.GetFilename().GetCString()); 3044 } 3045 } 3046 } 3047 3048 bool 3049 ObjectFileELF::GetArchitecture (ArchSpec &arch) 3050 { 3051 if (!ParseHeader()) 3052 return false; 3053 3054 if (m_section_headers.empty()) 3055 { 3056 // Allow elf notes to be parsed which may affect the detected architecture. 3057 ParseSectionHeaders(); 3058 } 3059 3060 arch = m_arch_spec; 3061 return true; 3062 } 3063 3064 ObjectFile::Type 3065 ObjectFileELF::CalculateType() 3066 { 3067 switch (m_header.e_type) 3068 { 3069 case llvm::ELF::ET_NONE: 3070 // 0 - No file type 3071 return eTypeUnknown; 3072 3073 case llvm::ELF::ET_REL: 3074 // 1 - Relocatable file 3075 return eTypeObjectFile; 3076 3077 case llvm::ELF::ET_EXEC: 3078 // 2 - Executable file 3079 return eTypeExecutable; 3080 3081 case llvm::ELF::ET_DYN: 3082 // 3 - Shared object file 3083 return eTypeSharedLibrary; 3084 3085 case ET_CORE: 3086 // 4 - Core file 3087 return eTypeCoreFile; 3088 3089 default: 3090 break; 3091 } 3092 return eTypeUnknown; 3093 } 3094 3095 ObjectFile::Strata 3096 ObjectFileELF::CalculateStrata() 3097 { 3098 switch (m_header.e_type) 3099 { 3100 case llvm::ELF::ET_NONE: 3101 // 0 - No file type 3102 return eStrataUnknown; 3103 3104 case llvm::ELF::ET_REL: 3105 // 1 - Relocatable file 3106 return eStrataUnknown; 3107 3108 case llvm::ELF::ET_EXEC: 3109 // 2 - Executable file 3110 // TODO: is there any way to detect that an executable is a kernel 3111 // related executable by inspecting the program headers, section 3112 // headers, symbols, or any other flag bits??? 3113 return eStrataUser; 3114 3115 case llvm::ELF::ET_DYN: 3116 // 3 - Shared object file 3117 // TODO: is there any way to detect that an shared library is a kernel 3118 // related executable by inspecting the program headers, section 3119 // headers, symbols, or any other flag bits??? 3120 return eStrataUnknown; 3121 3122 case ET_CORE: 3123 // 4 - Core file 3124 // TODO: is there any way to detect that an core file is a kernel 3125 // related executable by inspecting the program headers, section 3126 // headers, symbols, or any other flag bits??? 3127 return eStrataUnknown; 3128 3129 default: 3130 break; 3131 } 3132 return eStrataUnknown; 3133 } 3134 3135