elfcpp/elfcpp.h

   1 // elfcpp.h -- main header file for elfcpp    -*- C++ -*-
   2
   3 // This is the external interface for elfcpp.
   4
   5 #ifndef ELFCPP_H
   6 #define ELFCPP_H
   7
   8 #include "elfcpp_config.h"
   9
  10 #include <stdint.h>
  11
  12 namespace elfcpp
  13 {
  14
  15 // Basic ELF types.
  16
  17 // These types are always the same size.
  18
  19 typedef uint16_t Elf_Half;
  20 typedef uint32_t Elf_Word;
  21 typedef int32_t Elf_Sword;
  22 typedef uint64_t Elf_Xword;
  23 typedef int64_t Elf_Sxword;
  24
  25 // These types vary in size depending on the ELF file class.  The
  26 // template parameter should be 32 or 64.
  27
  28 template<int size>
  29 struct Elf_types
  30 {
  31   // Dummy types which should not be used.
  32   typedef unsigned char Elf_Addr;
  33   typedef unsigned char Elf_Off;
  34   // WXword is for fields which are Elf32_Word and Elf64_Xword.
  35   typedef unsigned char Elf_WXword;
  36 };
  37
  38 template<>
  39 struct Elf_types<32>
  40 {
  41   typedef uint32_t Elf_Addr;
  42   typedef uint32_t Elf_Off;
  43   typedef uint32_t Elf_WXword;
  44 };
  45
  46 template<>
  47 struct Elf_types<64>
  48 {
  49   typedef uint64_t Elf_Addr;
  50   typedef uint64_t Elf_Off;
  51   typedef uint64_t Elf_WXword;
  52   static const int ehdr_size;
  53   static const int shdr_size;
  54   static const int sym_size;
  55 };
  56
  57 // Offsets within the Ehdr e_ident field.
  58
  59 const int EI_MAG0 = 0;
  60 const int EI_MAG1 = 1;
  61 const int EI_MAG2 = 2;
  62 const int EI_MAG3 = 3;
  63 const int EI_CLASS = 4;
  64 const int EI_DATA = 5;
  65 const int EI_VERSION = 6;
  66 const int EI_OSABI = 7;
  67 const int EI_ABIVERSION = 8;
  68 const int EI_PAD = 9;
  69 const int EI_NIDENT = 16;
  70
  71 // The valid values found in Ehdr e_ident[EI_MAG0 through EI_MAG3].
  72
  73 const int ELFMAG0 = 0x7f;
  74 const int ELFMAG1 = 'E';
  75 const int ELFMAG2 = 'L';
  76 const int ELFMAG3 = 'F';
  77
  78 // The valid values found in Ehdr e_ident[EI_CLASS].
  79
  80 enum
  81 {
  82   ELFCLASSNONE = 0,
  83   ELFCLASS32 = 1,
  84   ELFCLASS64 = 2
  85 };
  86
  87 // The valid values found in Ehdr e_ident[EI_DATA].
  88
  89 enum
  90 {
  91   ELFDATANONE = 0,
  92   ELFDATA2LSB = 1,
  93   ELFDATA2MSB = 2
  94 };
  95
  96 // The valid values found in Ehdr e_ident[EI_VERSION] and e_version.
  97
  98 enum
  99 {
 100   EV_NONE = 0,
 101   EV_CURRENT = 1
 102 };
 103
 104 // The valid values found in Ehdr e_ident[EI_OSABI].
 105
 106 enum ELFOSABI
 107 {
 108   ELFOSABI_NONE = 0,
 109   ELFOSABI_HPUX = 1,
 110   ELFOSABI_NETBSD = 2,
 111   // ELFOSABI_LINUX is not listed in the ELF standard.
 112   ELFOSABI_LINUX = 3,
 113   // ELFOSABI_HURD is not listed in the ELF standard.
 114   ELFOSABI_HURD = 4,
 115   ELFOSABI_SOLARIS = 6,
 116   ELFOSABI_AIX = 7,
 117   ELFOSABI_IRIX = 8,
 118   ELFOSABI_FREEBSD = 9,
 119   ELFOSABI_TRU64 = 10,
 120   ELFOSABI_MODESTO = 11,
 121   ELFOSABI_OPENBSD = 12,
 122   ELFOSABI_OPENVMS = 13,
 123   ELFOSABI_NSK = 14,
 124   ELFOSABI_AROS = 15,
 125   // A GNU extension for the ARM.
 126   ELFOSABI_ARM = 97,
 127   // A GNU extension for the MSP.
 128   ELFOSABI_STANDALONE = 255
 129 };
 130
 131 // The valid values found in the Ehdr e_type field.
 132
 133 enum ET
 134 {
 135   ET_NONE = 0,
 136   ET_REL = 1,
 137   ET_EXEC = 2,
 138   ET_DYN = 3,
 139   ET_CORE = 4,
 140   ET_LOOS = 0xfe00,
 141   ET_HIOS = 0xfeff,
 142   ET_LOPROC = 0xff00,
 143   ET_HIPROC = 0xffff
 144 };
 145
 146 // The valid values found in the Ehdr e_machine field.
 147
 148 enum EM
 149 {
 150   EM_NONE = 0,
 151   EM_M32 = 1,
 152   EM_SPARC = 2,
 153   EM_386 = 3,
 154   EM_68K = 4,
 155   EM_88K = 5,
 156   // 6 used to be EM_486
 157   EM_860 = 7,
 158   EM_MIPS = 8,
 159   EM_S370 = 9,
 160   EM_MIPS_RS3_LE = 10,
 161   // 11 was the old Sparc V9 ABI.
 162   // 12 through 14 are reserved.
 163   EM_PARISC = 15,
 164   // 16 is reserved.
 165   // Some old PowerPC object files use 17.
 166   EM_VPP500 = 17,
 167   EM_SPARC32PLUS = 18,
 168   EM_960 = 19,
 169   EM_PPC = 20,
 170   EM_PPC64 = 21,
 171   EM_S390 = 22,
 172   // 23 through 35 are served.
 173   EM_V800 = 36,
 174   EM_FR20 = 37,
 175   EM_RH32 = 38,
 176   EM_RCE = 39,
 177   EM_ARM = 40,
 178   EM_ALPHA = 41,
 179   EM_SH = 42,
 180   EM_SPARCV9 = 43,
 181   EM_TRICORE = 44,
 182   EM_ARC = 45,
 183   EM_H8_300 = 46,
 184   EM_H8_300H = 47,
 185   EM_H8S = 48,
 186   EM_H8_500 = 49,
 187   EM_IA_64 = 50,
 188   EM_MIPS_X = 51,
 189   EM_COLDFIRE = 52,
 190   EM_68HC12 = 53,
 191   EM_MMA = 54,
 192   EM_PCP = 55,
 193   EM_NCPU = 56,
 194   EM_NDR1 = 57,
 195   EM_STARCORE = 58,
 196   EM_ME16 = 59,
 197   EM_ST100 = 60,
 198   EM_TINYJ = 61,
 199   EM_X86_64 = 62,
 200   EM_PDSP = 63,
 201   EM_PDP10 = 64,
 202   EM_PDP11 = 65,
 203   EM_FX66 = 66,
 204   EM_ST9PLUS = 67,
 205   EM_ST7 = 68,
 206   EM_68HC16 = 69,
 207   EM_68HC11 = 70,
 208   EM_68HC08 = 71,
 209   EM_68HC05 = 72,
 210   EM_SVX = 73,
 211   EM_ST19 = 74,
 212   EM_VAX = 75,
 213   EM_CRIS = 76,
 214   EM_JAVELIN = 77,
 215   EM_FIREPATH = 78,
 216   EM_ZSP = 79,
 217   EM_MMIX = 80,
 218   EM_HUANY = 81,
 219   EM_PRISM = 82,
 220   EM_AVR = 83,
 221   EM_FR30 = 84,
 222   EM_D10V = 85,
 223   EM_D30V = 86,
 224   EM_V850 = 87,
 225   EM_M32R = 88,
 226   EM_MN10300 = 89,
 227   EM_MN10200 = 90,
 228   EM_PJ = 91,
 229   EM_OPENRISC = 92,
 230   EM_ARC_A5 = 93,
 231   EM_XTENSA = 94,
 232   EM_VIDEOCORE = 95,
 233   EM_TMM_GPP = 96,
 234   EM_NS32K = 97,
 235   EM_TPC = 98,
 236   // Some old picoJava object files use 99 (EM_PJ is correct).
 237   EM_SNP1K = 99,
 238   EM_ST200 = 100,
 239   EM_IP2K = 101,
 240   EM_MAX = 102,
 241   EM_CR = 103,
 242   EM_F2MC16 = 104,
 243   EM_MSP430 = 105,
 244   EM_BLACKFIN = 106,
 245   EM_SE_C33 = 107,
 246   EM_SEP = 108,
 247   EM_ARCA = 109,
 248   EM_UNICORE = 110,
 249   EM_ALTERA_NIOS2 = 113,
 250   EM_CRX = 114,
 251   // The Morph MT.
 252   EM_MT = 0x2530,
 253   // DLX.
 254   EM_DLX = 0x5aa5,
 255   // FRV.
 256   EM_FRV = 0x5441,
 257   // Infineon Technologies 16-bit microcontroller with C166-V2 core.
 258   EM_X16X = 0x4688,
 259   // Xstorym16
 260   EM_XSTORMY16 = 0xad45,
 261   // Renesas M32C
 262   EM_M32C = 0xfeb0,
 263   // Vitesse IQ2000
 264   EM_IQ2000 = 0xfeba,
 265   // NIOS
 266   EM_NIOS32 = 0xfebb
 267   // Old AVR objects used 0x1057 (EM_AVR is correct).
 268   // Old MSP430 objects used 0x1059 (EM_MSP430 is correct).
 269   // Old FR30 objects used 0x3330 (EM_FR30 is correct).
 270   // Old OpenRISC objects used 0x3426 and 0x8472 (EM_OPENRISC is correct).
 271   // Old D10V objects used 0x7650 (EM_D10V is correct).
 272   // Old D30V objects used 0x7676 (EM_D30V is correct).
 273   // Old IP2X objects used 0x8217 (EM_IP2K is correct).
 274   // Old PowerPC objects used 0x9025 (EM_PPC is correct).
 275   // Old Alpha objects used 0x9026 (EM_ALPHA is correct).
 276   // Old M32R objects used 0x9041 (EM_M32R is correct).
 277   // Old V850 objects used 0x9080 (EM_V850 is correct).
 278   // Old S/390 objects used 0xa390 (EM_S390 is correct).
 279   // Old Xtensa objects used 0xabc7 (EM_XTENSA is correct).
 280   // Old MN10300 objects used 0xbeef (EM_MN10300 is correct).
 281   // Old MN10200 objects used 0xdead (EM_MN10200 is correct).
 282 };
 283
 284 // Special section indices.
 285
 286 enum
 287 {
 288   SHN_UNDEF = 0,
 289   SHN_LORESERVE = 0xff00,
 290   SHN_LOPROC = 0xff00,
 291   SHN_HIPROC = 0xff1f,
 292   SHN_LOOS = 0xff20,
 293   SHN_HIOS = 0xff3f,
 294   SHN_ABS = 0xfff1,
 295   SHN_COMMON = 0xfff2,
 296   SHN_XINDEX = 0xffff,
 297   SHN_HIRESERVE = 0xffff
 298 };
 299
 300 // The valid values found in the Shdr sh_type field.
 301
 302 enum
 303 {
 304   SHT_NULL = 0,
 305   SHT_PROGBITS = 1,
 306   SHT_SYMTAB = 2,
 307   SHT_STRTAB = 3,
 308   SHT_RELA = 4,
 309   SHT_HASH = 5,
 310   SHT_DYNAMIC = 6,
 311   SHT_NOTE = 7,
 312   SHT_NOBITS = 8,
 313   SHT_REL = 9,
 314   SHT_SHLIB = 10,
 315   SHT_DYNSYM = 11,
 316   SHT_INIT_ARRAY = 14,
 317   SHT_FINI_ARRAY = 15,
 318   SHT_PREINIT_ARRAY = 16,
 319   SHT_GROUP = 17,
 320   SHT_SYMTAB_SHNDX = 18,
 321   SHT_LOOS = 0x60000000,
 322   SHT_HIOS = 0x6fffffff,
 323   SHT_LOPROC = 0x70000000,
 324   SHT_HIPROC = 0x7fffffff,
 325   SHT_LOUSER = 0x80000000,
 326   SHT_HIUSER = 0xffffffff,
 327   // The remaining values are not in the standard.
 328   // List of prelink dependencies.
 329   SHT_GNU_LIBLIST = 0x6ffffff7,
 330   // Versions defined by file.
 331   SHT_SUNW_verdef = 0x6ffffffd,
 332   SHT_GNU_verdef = 0x6ffffffd,
 333   // Versions needed by file.
 334   SHT_SUNW_verneed = 0x6ffffffe,
 335   SHT_GNU_verneed = 0x6ffffffe,
 336   // Symbol versions,
 337   SHT_SUNW_versym = 0x6fffffff,
 338   SHT_GNU_versym = 0x6fffffff,
 339 };
 340
 341 // The valid bit flags found in the Shdr sh_flags field.
 342
 343 enum
 344 {
 345   SHF_WRITE = 0x1,
 346   SHF_ALLOC = 0x2,
 347   SHF_EXECINSTR = 0x4,
 348   SHF_MERGE = 0x10,
 349   SHF_STRINGS = 0x20,
 350   SHF_INFO_LINK = 0x40,
 351   SHF_LINK_ORDER = 0x80,
 352   SHF_OS_NONCONFORMING = 0x100,
 353   SHF_GROUP = 0x200,
 354   SHF_TLS = 0x400,
 355   SHF_MASKOS = 0x0ff00000,
 356   SHF_MASKPROC = 0xf0000000
 357 };
 358
 359 // Bit flags which appear in the first 32-bit word of the section data
 360 // of a SHT_GROUP section.
 361
 362 enum
 363 {
 364   GRP_COMDAT = 0x1,
 365   GRP_MASKOS = 0x0ff00000,
 366   GRP_MASKPROC = 0xf0000000
 367 };
 368
 369 // Symbol binding from Sym st_info field.
 370
 371 enum STB
 372 {
 373   STB_LOCAL = 0,
 374   STB_GLOBAL = 1,
 375   STB_WEAK = 2,
 376   STB_LOOS = 10,
 377   STB_HIOS = 12,
 378   STB_LOPROC = 13,
 379   STB_HIPROC = 15
 380 };
 381
 382 // Symbol types from Sym st_info field.
 383
 384 enum STT
 385 {
 386   STT_NOTYPE = 0,
 387   STT_OBJECT = 1,
 388   STT_FUNC = 2,
 389   STT_SECTION = 3,
 390   STT_FILE = 4,
 391   STT_COMMON = 5,
 392   STT_TLS = 6,
 393   STT_LOOS = 10,
 394   STT_HIOS = 12,
 395   STT_LOPROC = 13,
 396   STT_HIPROC = 15
 397 };
 398
 399 // Symbol visibility from Sym st_other field.
 400
 401 enum STV
 402 {
 403   STV_DEFAULT = 0,
 404   STV_INTERNAL = 1,
 405   STV_HIDDEN = 2,
 406   STV_PROTECTED = 3
 407 };
 408
 409 } // End namespace elfcpp.
 410
 411 // Include internal details after defining the types.
 412 #include "elfcpp_internal.h"
 413
 414 namespace elfcpp
 415 {
 416
 417 // The offset of the ELF file header in the ELF file.
 418
 419 const int file_header_offset = 0;
 420
 421 // ELF structure sizes.
 422
 423 template<int size>
 424 struct Elf_sizes
 425 {
 426   // Size of ELF file header.
 427   static const int ehdr_size = sizeof(internal::Ehdr_data<size>);
 428   // Size of ELF section header.
 429   static const int shdr_size = sizeof(internal::Shdr_data<size>);
 430   // Size of ELF symbol table entry.
 431   static const int sym_size = sizeof(internal::Sym_data<size>);
 432 };
 433
 434 // Accessor class for the ELF file header.
 435
 436 template<int size, bool big_endian>
 437 class Ehdr
 438 {
 439  public:
 440   Ehdr(const unsigned char* p)
 441     : p_(reinterpret_cast<const internal::Ehdr_data<size>*>(p))
 442   { }
 443
 444   const unsigned char*
 445   get_e_ident() const
 446   { return this->p_->e_ident; }
 447
 448   Elf_Half
 449   get_e_type() const
 450   { return internal::convert_half<big_endian>(this->p_->e_type); }
 451
 452   Elf_Half
 453   get_e_machine() const
 454   { return internal::convert_half<big_endian>(this->p_->e_machine); }
 455
 456   Elf_Word
 457   get_e_version() const
 458   { return internal::convert_word<big_endian>(this->p_->e_version); }
 459
 460   typename Elf_types<size>::Elf_Addr
 461   get_e_entry() const
 462   { return internal::convert_addr<size, big_endian>(this->p_->e_entry); }
 463
 464   typename Elf_types<size>::Elf_Off
 465   get_e_phoff() const
 466   { return internal::convert_off<size, big_endian>(this->p_->e_phoff); }
 467
 468   typename Elf_types<size>::Elf_Off
 469   get_e_shoff() const
 470   { return internal::convert_off<size, big_endian>(this->p_->e_shoff); }
 471
 472   Elf_Word
 473   get_e_flags() const
 474   { return internal::convert_word<big_endian>(this->p_->e_flags); }
 475
 476   Elf_Half
 477   get_e_ehsize() const
 478   { return internal::convert_half<big_endian>(this->p_->e_ehsize); }
 479
 480   Elf_Half
 481   get_e_phentsize() const
 482   { return internal::convert_half<big_endian>(this->p_->e_phentsize); }
 483
 484   Elf_Half
 485   get_e_phnum() const
 486   { return internal::convert_half<big_endian>(this->p_->e_phnum); }
 487
 488   Elf_Half
 489   get_e_shentsize() const
 490   { return internal::convert_half<big_endian>(this->p_->e_shentsize); }
 491
 492   Elf_Half
 493   get_e_shnum() const
 494   { return internal::convert_half<big_endian>(this->p_->e_shnum); }
 495
 496   Elf_Half
 497   get_e_shstrndx() const
 498   { return internal::convert_half<big_endian>(this->p_->e_shstrndx); }
 499
 500  private:
 501   const internal::Ehdr_data<size>* p_;
 502 };
 503
 504 // Accessor class for an ELF section header.
 505
 506 template<int size, bool big_endian>
 507 class Shdr
 508 {
 509  public:
 510   Shdr(const unsigned char* p)
 511     : p_(reinterpret_cast<const internal::Shdr_data<size>*>(p))
 512   { }
 513
 514   Elf_Word
 515   get_sh_name() const
 516   { return internal::convert_word<big_endian>(this->p_->sh_name); }
 517
 518   Elf_Word
 519   get_sh_type() const
 520   { return internal::convert_word<big_endian>(this->p_->sh_type); }
 521
 522   typename Elf_types<size>::Elf_WXword
 523   get_sh_flags() const
 524   { return internal::convert_wxword<size, big_endian>(this->p_->sh_flags); }
 525
 526   typename Elf_types<size>::Elf_Addr
 527   get_sh_addr() const
 528   { return internal::convert_addr<size, big_endian>(this->p_->sh_addr); }
 529
 530   typename Elf_types<size>::Elf_Off
 531   get_sh_offset() const
 532   { return internal::convert_off<size, big_endian>(this->p_->sh_offset); }
 533
 534   typename Elf_types<size>::Elf_WXword
 535   get_sh_size() const
 536   { return internal::convert_wxword<size, big_endian>(this->p_->sh_size); }
 537
 538   Elf_Word
 539   get_sh_link() const
 540   { return internal::convert_word<big_endian>(this->p_->sh_link); }
 541
 542   Elf_Word
 543   get_sh_info() const
 544   { return internal::convert_word<big_endian>(this->p_->sh_info); }
 545
 546   typename Elf_types<size>::Elf_WXword
 547   get_sh_addralign() const
 548   { return
 549       internal::convert_wxword<size, big_endian>(this->p_->sh_addralign); }
 550
 551   typename Elf_types<size>::Elf_WXword
 552   get_sh_entsize() const
 553   { return internal::convert_wxword<size, big_endian>(this->p_->sh_entsize); }
 554
 555  private:
 556   const internal::Shdr_data<size>* p_;
 557 };
 558
 559 // Accessor class for an ELF symbol table entry.
 560
 561 template<int size, bool big_endian>
 562 class Sym
 563 {
 564  public:
 565   Sym(const unsigned char* p)
 566     : p_(reinterpret_cast<const internal::Sym_data<size>*>(p))
 567   { }
 568
 569   Elf_Word
 570   get_st_name() const
 571   { return internal::convert_word<big_endian>(this->p_->st_name); }
 572
 573   typename Elf_types<size>::Elf_Addr
 574   get_st_value() const
 575   { return internal::convert_addr<size, big_endian>(this->p_->st_value); }
 576
 577   typename Elf_types<size>::Elf_WXword
 578   get_st_size() const
 579   { return internal::convert_wxword<big_endian>(this->p_->st_size); }
 580
 581   unsigned char
 582   get_st_info() const
 583   { return this->p_->st_info; }
 584
 585   unsigned char
 586   get_st_other() const
 587   { return this->p_->st_other; }
 588
 589   Elf_Half
 590   get_st_shndx() const
 591   { return internal::convert_half<big_endian>(this->p_->st_shndx); }
 592
 593  private:
 594   const internal::Sym_data<size>* p_;
 595 };
 596
 597 } // End namespace elfcpp.
 598
 599 #endif // !defined(ELFPCP_H)