ELF.h revision b84551a14f1c96942eb82408652e633543b0961e
1//===-- llvm/Support/ELF.h - ELF constants and data structures --*- 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// This header contains common, non-processor-specific data structures and 11// constants for the ELF file format. 12// 13// The details of the ELF32 bits in this file are largely based on the Tool 14// Interface Standard (TIS) Executable and Linking Format (ELF) Specification 15// Version 1.2, May 1995. The ELF64 stuff is based on ELF-64 Object File Format 16// Version 1.5, Draft 2, May 1998 as well as OpenBSD header files. 17// 18//===----------------------------------------------------------------------===// 19 20#ifndef LLVM_SUPPORT_ELF_H 21#define LLVM_SUPPORT_ELF_H 22 23#include "llvm/Support/DataTypes.h" 24#include <cstring> 25 26namespace llvm { 27 28namespace ELF { 29 30typedef uint32_t Elf32_Addr; // Program address 31typedef uint16_t Elf32_Half; 32typedef uint32_t Elf32_Off; // File offset 33typedef int32_t Elf32_Sword; 34typedef uint32_t Elf32_Word; 35 36typedef uint64_t Elf64_Addr; 37typedef uint64_t Elf64_Off; 38typedef int32_t Elf64_Shalf; 39typedef int32_t Elf64_Sword; 40typedef uint32_t Elf64_Word; 41typedef int64_t Elf64_Sxword; 42typedef uint64_t Elf64_Xword; 43typedef uint32_t Elf64_Half; 44typedef uint16_t Elf64_Quarter; 45 46// Object file magic string. 47static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' }; 48 49// e_ident size and indices. 50enum { 51 EI_MAG0 = 0, // File identification index. 52 EI_MAG1 = 1, // File identification index. 53 EI_MAG2 = 2, // File identification index. 54 EI_MAG3 = 3, // File identification index. 55 EI_CLASS = 4, // File class. 56 EI_DATA = 5, // Data encoding. 57 EI_VERSION = 6, // File version. 58 EI_OSABI = 7, // OS/ABI identification. 59 EI_ABIVERSION = 8, // ABI version. 60 EI_PAD = 9, // Start of padding bytes. 61 EI_NIDENT = 16 // Number of bytes in e_ident. 62}; 63 64struct Elf32_Ehdr { 65 unsigned char e_ident[EI_NIDENT]; // ELF Identification bytes 66 Elf32_Half e_type; // Type of file (see ET_* below) 67 Elf32_Half e_machine; // Required architecture for this file (see EM_*) 68 Elf32_Word e_version; // Must be equal to 1 69 Elf32_Addr e_entry; // Address to jump to in order to start program 70 Elf32_Off e_phoff; // Program header table's file offset, in bytes 71 Elf32_Off e_shoff; // Section header table's file offset, in bytes 72 Elf32_Word e_flags; // Processor-specific flags 73 Elf32_Half e_ehsize; // Size of ELF header, in bytes 74 Elf32_Half e_phentsize; // Size of an entry in the program header table 75 Elf32_Half e_phnum; // Number of entries in the program header table 76 Elf32_Half e_shentsize; // Size of an entry in the section header table 77 Elf32_Half e_shnum; // Number of entries in the section header table 78 Elf32_Half e_shstrndx; // Sect hdr table index of sect name string table 79 bool checkMagic() const { 80 return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0; 81 } 82 unsigned char getFileClass() const { return e_ident[EI_CLASS]; } 83 unsigned char getDataEncoding() const { return e_ident[EI_DATA]; } 84}; 85 86// 64-bit ELF header. Fields are the same as for ELF32, but with different 87// types (see above). 88struct Elf64_Ehdr { 89 unsigned char e_ident[EI_NIDENT]; 90 Elf64_Quarter e_type; 91 Elf64_Quarter e_machine; 92 Elf64_Half e_version; 93 Elf64_Addr e_entry; 94 Elf64_Off e_phoff; 95 Elf64_Off e_shoff; 96 Elf64_Half e_flags; 97 Elf64_Quarter e_ehsize; 98 Elf64_Quarter e_phentsize; 99 Elf64_Quarter e_phnum; 100 Elf64_Quarter e_shentsize; 101 Elf64_Quarter e_shnum; 102 Elf64_Quarter e_shstrndx; 103 bool checkMagic() const { 104 return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0; 105 } 106 unsigned char getFileClass() const { return e_ident[EI_CLASS]; } 107 unsigned char getDataEncoding() const { return e_ident[EI_DATA]; } 108}; 109 110// File types 111enum { 112 ET_NONE = 0, // No file type 113 ET_REL = 1, // Relocatable file 114 ET_EXEC = 2, // Executable file 115 ET_DYN = 3, // Shared object file 116 ET_CORE = 4, // Core file 117 ET_LOPROC = 0xff00, // Beginning of processor-specific codes 118 ET_HIPROC = 0xffff // Processor-specific 119}; 120 121// Versioning 122enum { 123 EV_NONE = 0, 124 EV_CURRENT = 1 125}; 126 127// Machine architectures 128enum { 129 EM_NONE = 0, // No machine 130 EM_M32 = 1, // AT&T WE 32100 131 EM_SPARC = 2, // SPARC 132 EM_386 = 3, // Intel 386 133 EM_68K = 4, // Motorola 68000 134 EM_88K = 5, // Motorola 88000 135 EM_486 = 6, // Intel 486 (deprecated) 136 EM_860 = 7, // Intel 80860 137 EM_MIPS = 8, // MIPS R3000 138 EM_PPC = 20, // PowerPC 139 EM_PPC64 = 21, // PowerPC64 140 EM_ARM = 40, // ARM 141 EM_ALPHA = 41, // DEC Alpha 142 EM_SPARCV9 = 43, // SPARC V9 143 EM_X86_64 = 62, // AMD64 144 EM_MBLAZE = 47787 // Xilinx MicroBlaze 145}; 146 147// Object file classes. 148enum { 149 ELFCLASSNONE = 0, 150 ELFCLASS32 = 1, // 32-bit object file 151 ELFCLASS64 = 2 // 64-bit object file 152}; 153 154// Object file byte orderings. 155enum { 156 ELFDATANONE = 0, // Invalid data encoding. 157 ELFDATA2LSB = 1, // Little-endian object file 158 ELFDATA2MSB = 2 // Big-endian object file 159}; 160 161// OS ABI identification. 162enum { 163 ELFOSABI_NONE = 0, // UNIX System V ABI 164 ELFOSABI_HPUX = 1, // HP-UX operating system 165 ELFOSABI_NETBSD = 2, // NetBSD 166 ELFOSABI_LINUX = 3, // GNU/Linux 167 ELFOSABI_HURD = 4, // GNU/Hurd 168 ELFOSABI_SOLARIS = 6, // Solaris 169 ELFOSABI_AIX = 7, // AIX 170 ELFOSABI_IRIX = 8, // IRIX 171 ELFOSABI_FREEBSD = 9, // FreeBSD 172 ELFOSABI_TRU64 = 10, // TRU64 UNIX 173 ELFOSABI_MODESTO = 11, // Novell Modesto 174 ELFOSABI_OPENBSD = 12, // OpenBSD 175 ELFOSABI_OPENVMS = 13, // OpenVMS 176 ELFOSABI_NSK = 14, // Hewlett-Packard Non-Stop Kernel 177 ELFOSABI_AROS = 15, // AROS 178 ELFOSABI_FENIXOS = 16, // FenixOS 179 ELFOSABI_C6000_ELFABI = 64, // Bare-metal TMS320C6000 180 ELFOSABI_C6000_LINUX = 65, // Linux TMS320C6000 181 ELFOSABI_ARM = 97, // ARM 182 ELFOSABI_STANDALONE = 255 // Standalone (embedded) application 183}; 184 185// X86_64 relocations. 186enum { 187 R_X86_64_NONE = 0, 188 R_X86_64_64 = 1, 189 R_X86_64_PC32 = 2, 190 R_X86_64_GOT32 = 3, 191 R_X86_64_PLT32 = 4, 192 R_X86_64_COPY = 5, 193 R_X86_64_GLOB_DAT = 6, 194 R_X86_64_JUMP_SLOT = 7, 195 R_X86_64_RELATIVE = 8, 196 R_X86_64_GOTPCREL = 9, 197 R_X86_64_32 = 10, 198 R_X86_64_32S = 11, 199 R_X86_64_16 = 12, 200 R_X86_64_PC16 = 13, 201 R_X86_64_8 = 14, 202 R_X86_64_PC8 = 15, 203 R_X86_64_DTPMOD64 = 16, 204 R_X86_64_DTPOFF64 = 17, 205 R_X86_64_TPOFF64 = 18, 206 R_X86_64_TLSGD = 19, 207 R_X86_64_TLSLD = 20, 208 R_X86_64_DTPOFF32 = 21, 209 R_X86_64_GOTTPOFF = 22, 210 R_X86_64_TPOFF32 = 23, 211 R_X86_64_PC64 = 24, 212 R_X86_64_GOTOFF64 = 25, 213 R_X86_64_GOTPC32 = 26, 214 R_X86_64_SIZE32 = 32, 215 R_X86_64_SIZE64 = 33, 216 R_X86_64_GOTPC32_TLSDESC = 34, 217 R_X86_64_TLSDESC_CALL = 35, 218 R_X86_64_TLSDESC = 36 219}; 220 221// i386 relocations. 222// TODO: this is just a subset 223enum { 224 R_386_NONE = 0, 225 R_386_32 = 1, 226 R_386_PC32 = 2, 227 R_386_GOT32 = 3, 228 R_386_PLT32 = 4, 229 R_386_COPY = 5, 230 R_386_GLOB_DAT = 6, 231 R_386_JUMP_SLOT = 7, 232 R_386_RELATIVE = 8, 233 R_386_GOTOFF = 9, 234 R_386_GOTPC = 10, 235 R_386_32PLT = 11, 236 R_386_TLS_TPOFF = 14, 237 R_386_TLS_IE = 15, 238 R_386_TLS_GOTIE = 16, 239 R_386_TLS_LE = 17, 240 R_386_TLS_GD = 18, 241 R_386_TLS_LDM = 19, 242 R_386_16 = 20, 243 R_386_PC16 = 21, 244 R_386_8 = 22, 245 R_386_PC8 = 23, 246 R_386_TLS_GD_32 = 24, 247 R_386_TLS_GD_PUSH = 25, 248 R_386_TLS_GD_CALL = 26, 249 R_386_TLS_GD_POP = 27, 250 R_386_TLS_LDM_32 = 28, 251 R_386_TLS_LDM_PUSH = 29, 252 R_386_TLS_LDM_CALL = 30, 253 R_386_TLS_LDM_POP = 31, 254 R_386_TLS_LDO_32 = 32, 255 R_386_TLS_IE_32 = 33, 256 R_386_TLS_LE_32 = 34, 257 R_386_TLS_DTPMOD32 = 35, 258 R_386_TLS_DTPOFF32 = 36, 259 R_386_TLS_TPOFF32 = 37, 260 R_386_TLS_GOTDESC = 39, 261 R_386_TLS_DESC_CALL = 40, 262 R_386_TLS_DESC = 41, 263 R_386_IRELATIVE = 42, 264 R_386_NUM = 43 265}; 266 267// MBlaze relocations. 268enum { 269 R_MICROBLAZE_NONE = 0, 270 R_MICROBLAZE_32 = 1, 271 R_MICROBLAZE_32_PCREL = 2, 272 R_MICROBLAZE_64_PCREL = 3, 273 R_MICROBLAZE_32_PCREL_LO = 4, 274 R_MICROBLAZE_64 = 5, 275 R_MICROBLAZE_32_LO = 6, 276 R_MICROBLAZE_SRO32 = 7, 277 R_MICROBLAZE_SRW32 = 8, 278 R_MICROBLAZE_64_NONE = 9, 279 R_MICROBLAZE_32_SYM_OP_SYM = 10, 280 R_MICROBLAZE_GNU_VTINHERIT = 11, 281 R_MICROBLAZE_GNU_VTENTRY = 12, 282 R_MICROBLAZE_GOTPC_64 = 13, 283 R_MICROBLAZE_GOT_64 = 14, 284 R_MICROBLAZE_PLT_64 = 15, 285 R_MICROBLAZE_REL = 16, 286 R_MICROBLAZE_JUMP_SLOT = 17, 287 R_MICROBLAZE_GLOB_DAT = 18, 288 R_MICROBLAZE_GOTOFF_64 = 19, 289 R_MICROBLAZE_GOTOFF_32 = 20, 290 R_MICROBLAZE_COPY = 21 291}; 292 293// ELF Relocation types for ARM 294// Meets 2.08 ABI Specs. 295 296enum { 297 R_ARM_NONE = 0x00, 298 R_ARM_PC24 = 0x01, 299 R_ARM_ABS32 = 0x02, 300 R_ARM_REL32 = 0x03, 301 R_ARM_LDR_PC_G0 = 0x04, 302 R_ARM_ABS16 = 0x05, 303 R_ARM_ABS12 = 0x06, 304 R_ARM_THM_ABS5 = 0x07, 305 R_ARM_ABS8 = 0x08, 306 R_ARM_SBREL32 = 0x09, 307 R_ARM_THM_CALL = 0x0a, 308 R_ARM_THM_PC8 = 0x0b, 309 R_ARM_BREL_ADJ = 0x0c, 310 R_ARM_TLS_DESC = 0x0d, 311 R_ARM_THM_SWI8 = 0x0e, 312 R_ARM_XPC25 = 0x0f, 313 R_ARM_THM_XPC22 = 0x10, 314 R_ARM_TLS_DTPMOD32 = 0x11, 315 R_ARM_TLS_DTPOFF32 = 0x12, 316 R_ARM_TLS_TPOFF32 = 0x13, 317 R_ARM_COPY = 0x14, 318 R_ARM_GLOB_DAT = 0x15, 319 R_ARM_JUMP_SLOT = 0x16, 320 R_ARM_RELATIVE = 0x17, 321 R_ARM_GOTOFF32 = 0x18, 322 R_ARM_BASE_PREL = 0x19, 323 R_ARM_GOT_BREL = 0x1a, 324 R_ARM_PLT32 = 0x1b, 325 R_ARM_CALL = 0x1c, 326 R_ARM_JUMP24 = 0x1d, 327 R_ARM_THM_JUMP24 = 0x1e, 328 R_ARM_BASE_ABS = 0x1f, 329 R_ARM_ALU_PCREL_7_0 = 0x20, 330 R_ARM_ALU_PCREL_15_8 = 0x21, 331 R_ARM_ALU_PCREL_23_15 = 0x22, 332 R_ARM_LDR_SBREL_11_0_NC = 0x23, 333 R_ARM_ALU_SBREL_19_12_NC = 0x24, 334 R_ARM_ALU_SBREL_27_20_CK = 0x25, 335 R_ARM_TARGET1 = 0x26, 336 R_ARM_SBREL31 = 0x27, 337 R_ARM_V4BX = 0x28, 338 R_ARM_TARGET2 = 0x29, 339 R_ARM_PREL31 = 0x2a, 340 R_ARM_MOVW_ABS_NC = 0x2b, 341 R_ARM_MOVT_ABS = 0x2c, 342 R_ARM_MOVW_PREL_NC = 0x2d, 343 R_ARM_MOVT_PREL = 0x2e, 344 R_ARM_THM_MOVW_ABS_NC = 0x2f, 345 R_ARM_THM_MOVT_ABS = 0x30, 346 R_ARM_THM_MOVW_PREL_NC = 0x31, 347 R_ARM_THM_MOVT_PREL = 0x32, 348 R_ARM_THM_JUMP19 = 0x33, 349 R_ARM_THM_JUMP6 = 0x34, 350 R_ARM_THM_ALU_PREL_11_0 = 0x35, 351 R_ARM_THM_PC12 = 0x36, 352 R_ARM_ABS32_NOI = 0x37, 353 R_ARM_REL32_NOI = 0x38, 354 R_ARM_ALU_PC_G0_NC = 0x39, 355 R_ARM_ALU_PC_G0 = 0x3a, 356 R_ARM_ALU_PC_G1_NC = 0x3b, 357 R_ARM_ALU_PC_G1 = 0x3c, 358 R_ARM_ALU_PC_G2 = 0x3d, 359 R_ARM_LDR_PC_G1 = 0x3e, 360 R_ARM_LDR_PC_G2 = 0x3f, 361 R_ARM_LDRS_PC_G0 = 0x40, 362 R_ARM_LDRS_PC_G1 = 0x41, 363 R_ARM_LDRS_PC_G2 = 0x42, 364 R_ARM_LDC_PC_G0 = 0x43, 365 R_ARM_LDC_PC_G1 = 0x44, 366 R_ARM_LDC_PC_G2 = 0x45, 367 R_ARM_ALU_SB_G0_NC = 0x46, 368 R_ARM_ALU_SB_G0 = 0x47, 369 R_ARM_ALU_SB_G1_NC = 0x48, 370 R_ARM_ALU_SB_G1 = 0x49, 371 R_ARM_ALU_SB_G2 = 0x4a, 372 R_ARM_LDR_SB_G0 = 0x4b, 373 R_ARM_LDR_SB_G1 = 0x4c, 374 R_ARM_LDR_SB_G2 = 0x4d, 375 R_ARM_LDRS_SB_G0 = 0x4e, 376 R_ARM_LDRS_SB_G1 = 0x4f, 377 R_ARM_LDRS_SB_G2 = 0x50, 378 R_ARM_LDC_SB_G0 = 0x51, 379 R_ARM_LDC_SB_G1 = 0x52, 380 R_ARM_LDC_SB_G2 = 0x53, 381 R_ARM_MOVW_BREL_NC = 0x54, 382 R_ARM_MOVT_BREL = 0x55, 383 R_ARM_MOVW_BREL = 0x56, 384 R_ARM_THM_MOVW_BREL_NC = 0x57, 385 R_ARM_THM_MOVT_BREL = 0x58, 386 R_ARM_THM_MOVW_BREL = 0x59, 387 R_ARM_TLS_GOTDESC = 0x5a, 388 R_ARM_TLS_CALL = 0x5b, 389 R_ARM_TLS_DESCSEQ = 0x5c, 390 R_ARM_THM_TLS_CALL = 0x5d, 391 R_ARM_PLT32_ABS = 0x5e, 392 R_ARM_GOT_ABS = 0x5f, 393 R_ARM_GOT_PREL = 0x60, 394 R_ARM_GOT_BREL12 = 0x61, 395 R_ARM_GOTOFF12 = 0x62, 396 R_ARM_GOTRELAX = 0x63, 397 R_ARM_GNU_VTENTRY = 0x64, 398 R_ARM_GNU_VTINHERIT = 0x65, 399 R_ARM_THM_JUMP11 = 0x66, 400 R_ARM_THM_JUMP8 = 0x67, 401 R_ARM_TLS_GD32 = 0x68, 402 R_ARM_TLS_LDM32 = 0x69, 403 R_ARM_TLS_LDO32 = 0x6a, 404 R_ARM_TLS_IE32 = 0x6b, 405 R_ARM_TLS_LE32 = 0x6c, 406 R_ARM_TLS_LDO12 = 0x6d, 407 R_ARM_TLS_LE12 = 0x6e, 408 R_ARM_TLS_IE12GP = 0x6f, 409 R_ARM_PRIVATE_0 = 0x70, 410 R_ARM_PRIVATE_1 = 0x71, 411 R_ARM_PRIVATE_2 = 0x72, 412 R_ARM_PRIVATE_3 = 0x73, 413 R_ARM_PRIVATE_4 = 0x74, 414 R_ARM_PRIVATE_5 = 0x75, 415 R_ARM_PRIVATE_6 = 0x76, 416 R_ARM_PRIVATE_7 = 0x77, 417 R_ARM_PRIVATE_8 = 0x78, 418 R_ARM_PRIVATE_9 = 0x79, 419 R_ARM_PRIVATE_10 = 0x7a, 420 R_ARM_PRIVATE_11 = 0x7b, 421 R_ARM_PRIVATE_12 = 0x7c, 422 R_ARM_PRIVATE_13 = 0x7d, 423 R_ARM_PRIVATE_14 = 0x7e, 424 R_ARM_PRIVATE_15 = 0x7f, 425 R_ARM_ME_TOO = 0x80, 426 R_ARM_THM_TLS_DESCSEQ16 = 0x81, 427 R_ARM_THM_TLS_DESCSEQ32 = 0x82 428}; 429 430 431 432// Section header. 433struct Elf32_Shdr { 434 Elf32_Word sh_name; // Section name (index into string table) 435 Elf32_Word sh_type; // Section type (SHT_*) 436 Elf32_Word sh_flags; // Section flags (SHF_*) 437 Elf32_Addr sh_addr; // Address where section is to be loaded 438 Elf32_Off sh_offset; // File offset of section data, in bytes 439 Elf32_Word sh_size; // Size of section, in bytes 440 Elf32_Word sh_link; // Section type-specific header table index link 441 Elf32_Word sh_info; // Section type-specific extra information 442 Elf32_Word sh_addralign; // Section address alignment 443 Elf32_Word sh_entsize; // Size of records contained within the section 444}; 445 446// Section header for ELF64 - same fields as ELF32, different types. 447struct Elf64_Shdr { 448 Elf64_Half sh_name; 449 Elf64_Half sh_type; 450 Elf64_Xword sh_flags; 451 Elf64_Addr sh_addr; 452 Elf64_Off sh_offset; 453 Elf64_Xword sh_size; 454 Elf64_Half sh_link; 455 Elf64_Half sh_info; 456 Elf64_Xword sh_addralign; 457 Elf64_Xword sh_entsize; 458}; 459 460// Special section indices. 461enum { 462 SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless 463 SHN_LORESERVE = 0xff00, // Lowest reserved index 464 SHN_LOPROC = 0xff00, // Lowest processor-specific index 465 SHN_HIPROC = 0xff1f, // Highest processor-specific index 466 SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation 467 SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables 468 SHN_XINDEX = 0xffff, // Mark that the index is >= SHN_LORESERVE 469 SHN_HIRESERVE = 0xffff // Highest reserved index 470}; 471 472// Section types. 473enum { 474 SHT_NULL = 0, // No associated section (inactive entry). 475 SHT_PROGBITS = 1, // Program-defined contents. 476 SHT_SYMTAB = 2, // Symbol table. 477 SHT_STRTAB = 3, // String table. 478 SHT_RELA = 4, // Relocation entries; explicit addends. 479 SHT_HASH = 5, // Symbol hash table. 480 SHT_DYNAMIC = 6, // Information for dynamic linking. 481 SHT_NOTE = 7, // Information about the file. 482 SHT_NOBITS = 8, // Data occupies no space in the file. 483 SHT_REL = 9, // Relocation entries; no explicit addends. 484 SHT_SHLIB = 10, // Reserved. 485 SHT_DYNSYM = 11, // Symbol table. 486 SHT_INIT_ARRAY = 14, // Pointers to initialisation functions. 487 SHT_FINI_ARRAY = 15, // Pointers to termination functions. 488 SHT_PREINIT_ARRAY = 16, // Pointers to pre-init functions. 489 SHT_GROUP = 17, // Section group. 490 SHT_SYMTAB_SHNDX = 18, // Indicies for SHN_XINDEX entries. 491 SHT_LOOS = 0x60000000, // Lowest operating system-specific type. 492 SHT_HIOS = 0x6fffffff, // Highest operating system-specific type. 493 SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type. 494 // Fixme: All this is duplicated in MCSectionELF. Why?? 495 // Exception Index table 496 SHT_ARM_EXIDX = 0x70000001U, 497 // BPABI DLL dynamic linking pre-emption map 498 SHT_ARM_PREEMPTMAP = 0x70000002U, 499 // Object file compatibility attributes 500 SHT_ARM_ATTRIBUTES = 0x70000003U, 501 SHT_ARM_DEBUGOVERLAY = 0x70000004U, 502 SHT_ARM_OVERLAYSECTION = 0x70000005U, 503 504 SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type. 505 SHT_LOUSER = 0x80000000, // Lowest type reserved for applications. 506 SHT_HIUSER = 0xffffffff // Highest type reserved for applications. 507}; 508 509// Section flags. 510enum { 511 SHF_WRITE = 0x1, // Section data should be writable during execution. 512 SHF_ALLOC = 0x2, // Section occupies memory during program execution. 513 SHF_EXECINSTR = 0x4, // Section contains executable machine instructions. 514 SHF_MERGE = 0x10, // The data in this section may be merged. 515 SHF_STRINGS = 0x20, // The data in this section is null-terminated strings. 516 SHF_MASKPROC = 0xf0000000 // Bits indicating processor-specific flags. 517}; 518 519// Section Group Flags 520enum { 521 GRP_COMDAT = 0x1, 522 GRP_MASKOS = 0x0ff00000, 523 GRP_MASKPROC = 0xf0000000 524}; 525 526// Symbol table entries for ELF32. 527struct Elf32_Sym { 528 Elf32_Word st_name; // Symbol name (index into string table) 529 Elf32_Addr st_value; // Value or address associated with the symbol 530 Elf32_Word st_size; // Size of the symbol 531 unsigned char st_info; // Symbol's type and binding attributes 532 unsigned char st_other; // Must be zero; reserved 533 Elf32_Half st_shndx; // Which section (header table index) it's defined in 534 535 // These accessors and mutators correspond to the ELF32_ST_BIND, 536 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification: 537 unsigned char getBinding() const { return st_info >> 4; } 538 unsigned char getType() const { return st_info & 0x0f; } 539 void setBinding(unsigned char b) { setBindingAndType(b, getType()); } 540 void setType(unsigned char t) { setBindingAndType(getBinding(), t); } 541 void setBindingAndType(unsigned char b, unsigned char t) { 542 st_info = (b << 4) + (t & 0x0f); 543 } 544}; 545 546// Symbol table entries for ELF64. 547struct Elf64_Sym { 548 Elf64_Word st_name; // Symbol name (index into string table) 549 unsigned char st_info; // Symbol's type and binding attributes 550 unsigned char st_other; // Must be zero; reserved 551 Elf64_Half st_shndx; // Which section (header table index) it's defined in 552 Elf64_Addr st_value; // Value or address associated with the symbol 553 Elf64_Xword st_size; // Size of the symbol 554 555 // These accessors and mutators are identical to those defined for ELF32 556 // symbol table entries. 557 unsigned char getBinding() const { return st_info >> 4; } 558 unsigned char getType() const { return st_info & 0x0f; } 559 void setBinding(unsigned char b) { setBindingAndType(b, getType()); } 560 void setType(unsigned char t) { setBindingAndType(getBinding(), t); } 561 void setBindingAndType(unsigned char b, unsigned char t) { 562 st_info = (b << 4) + (t & 0x0f); 563 } 564}; 565 566// The size (in bytes) of symbol table entries. 567enum { 568 SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size 569 SYMENTRY_SIZE64 = 24 // 64-bit symbol entry size. 570}; 571 572// Symbol bindings. 573enum { 574 STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def 575 STB_GLOBAL = 1, // Global symbol, visible to all object files being combined 576 STB_WEAK = 2, // Weak symbol, like global but lower-precedence 577 STB_LOPROC = 13, // Lowest processor-specific binding type 578 STB_HIPROC = 15 // Highest processor-specific binding type 579}; 580 581// Symbol types. 582enum { 583 STT_NOTYPE = 0, // Symbol's type is not specified 584 STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.) 585 STT_FUNC = 2, // Symbol is executable code (function, etc.) 586 STT_SECTION = 3, // Symbol refers to a section 587 STT_FILE = 4, // Local, absolute symbol that refers to a file 588 STT_COMMON = 5, // An uninitialised common block 589 STT_TLS = 6, // Thread local data object 590 STT_LOPROC = 13, // Lowest processor-specific symbol type 591 STT_HIPROC = 15 // Highest processor-specific symbol type 592}; 593 594enum { 595 STV_DEFAULT = 0, // Visibility is specified by binding type 596 STV_INTERNAL = 1, // Defined by processor supplements 597 STV_HIDDEN = 2, // Not visible to other components 598 STV_PROTECTED = 3 // Visible in other components but not preemptable 599}; 600 601// Relocation entry, without explicit addend. 602struct Elf32_Rel { 603 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr) 604 Elf32_Word r_info; // Symbol table index and type of relocation to apply 605 606 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, 607 // and ELF32_R_INFO macros defined in the ELF specification: 608 Elf32_Word getSymbol() const { return (r_info >> 8); } 609 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } 610 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); } 611 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 612 void setSymbolAndType(Elf32_Word s, unsigned char t) { 613 r_info = (s << 8) + t; 614 } 615}; 616 617// Relocation entry with explicit addend. 618struct Elf32_Rela { 619 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr) 620 Elf32_Word r_info; // Symbol table index and type of relocation to apply 621 Elf32_Sword r_addend; // Compute value for relocatable field by adding this 622 623 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE, 624 // and ELF32_R_INFO macros defined in the ELF specification: 625 Elf32_Word getSymbol() const { return (r_info >> 8); } 626 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); } 627 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); } 628 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 629 void setSymbolAndType(Elf32_Word s, unsigned char t) { 630 r_info = (s << 8) + t; 631 } 632}; 633 634// Relocation entry, without explicit addend. 635struct Elf64_Rel { 636 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr). 637 Elf64_Xword r_info; // Symbol table index and type of relocation to apply. 638 639 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, 640 // and ELF64_R_INFO macros defined in the ELF specification: 641 Elf64_Xword getSymbol() const { return (r_info >> 32); } 642 unsigned char getType() const { 643 return (unsigned char) (r_info & 0xffffffffL); 644 } 645 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); } 646 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 647 void setSymbolAndType(Elf64_Xword s, unsigned char t) { 648 r_info = (s << 32) + (t&0xffffffffL); 649 } 650}; 651 652// Relocation entry with explicit addend. 653struct Elf64_Rela { 654 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr). 655 Elf64_Xword r_info; // Symbol table index and type of relocation to apply. 656 Elf64_Sxword r_addend; // Compute value for relocatable field by adding this. 657 658 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE, 659 // and ELF64_R_INFO macros defined in the ELF specification: 660 Elf64_Xword getSymbol() const { return (r_info >> 32); } 661 unsigned char getType() const { 662 return (unsigned char) (r_info & 0xffffffffL); 663 } 664 void setSymbol(Elf64_Xword s) { setSymbolAndType(s, getType()); } 665 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); } 666 void setSymbolAndType(Elf64_Xword s, unsigned char t) { 667 r_info = (s << 32) + (t&0xffffffffL); 668 } 669}; 670 671// Program header for ELF32. 672struct Elf32_Phdr { 673 Elf32_Word p_type; // Type of segment 674 Elf32_Off p_offset; // File offset where segment is located, in bytes 675 Elf32_Addr p_vaddr; // Virtual address of beginning of segment 676 Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific) 677 Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero) 678 Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero) 679 Elf32_Word p_flags; // Segment flags 680 Elf32_Word p_align; // Segment alignment constraint 681}; 682 683// Program header for ELF64. 684struct Elf64_Phdr { 685 Elf64_Word p_type; // Type of segment 686 Elf64_Word p_flags; // Segment flags 687 Elf64_Off p_offset; // File offset where segment is located, in bytes 688 Elf64_Addr p_vaddr; // Virtual address of beginning of segment 689 Elf64_Addr p_paddr; // Physical address of beginning of segment (OS-specific) 690 Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero) 691 Elf64_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero) 692 Elf64_Xword p_align; // Segment alignment constraint 693}; 694 695// Segment types. 696enum { 697 PT_NULL = 0, // Unused segment. 698 PT_LOAD = 1, // Loadable segment. 699 PT_DYNAMIC = 2, // Dynamic linking information. 700 PT_INTERP = 3, // Interpreter pathname. 701 PT_NOTE = 4, // Auxiliary information. 702 PT_SHLIB = 5, // Reserved. 703 PT_PHDR = 6, // The program header table itself. 704 PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type. 705 PT_HIPROC = 0x7fffffff // Highest processor-specific program hdr entry type. 706}; 707 708// Segment flag bits. 709enum { 710 PF_X = 1, // Execute 711 PF_W = 2, // Write 712 PF_R = 4, // Read 713 PF_MASKPROC = 0xf0000000 // Unspecified 714}; 715 716// Dynamic table entry for ELF32. 717struct Elf32_Dyn 718{ 719 Elf32_Sword d_tag; // Type of dynamic table entry. 720 union 721 { 722 Elf32_Word d_val; // Integer value of entry. 723 Elf32_Addr d_ptr; // Pointer value of entry. 724 } d_un; 725}; 726 727// Dynamic table entry for ELF64. 728struct Elf64_Dyn 729{ 730 Elf64_Sxword d_tag; // Type of dynamic table entry. 731 union 732 { 733 Elf64_Xword d_val; // Integer value of entry. 734 Elf64_Addr d_ptr; // Pointer value of entry. 735 } d_un; 736}; 737 738// Dynamic table entry tags. 739enum { 740 DT_NULL = 0, // Marks end of dynamic array. 741 DT_NEEDED = 1, // String table offset of needed library. 742 DT_PLTRELSZ = 2, // Size of relocation entries in PLT. 743 DT_PLTGOT = 3, // Address associated with linkage table. 744 DT_HASH = 4, // Address of symbolic hash table. 745 DT_STRTAB = 5, // Address of dynamic string table. 746 DT_SYMTAB = 6, // Address of dynamic symbol table. 747 DT_RELA = 7, // Address of relocation table (Rela entries). 748 DT_RELASZ = 8, // Size of Rela relocation table. 749 DT_RELAENT = 9, // Size of a Rela relocation entry. 750 DT_STRSZ = 10, // Total size of the string table. 751 DT_SYMENT = 11, // Size of a symbol table entry. 752 DT_INIT = 12, // Address of initialization function. 753 DT_FINI = 13, // Address of termination function. 754 DT_SONAME = 14, // String table offset of a shared objects name. 755 DT_RPATH = 15, // String table offset of library search path. 756 DT_SYMBOLIC = 16, // Changes symbol resolution algorithm. 757 DT_REL = 17, // Address of relocation table (Rel entries). 758 DT_RELSZ = 18, // Size of Rel relocation table. 759 DT_RELENT = 19, // Size of a Rel relocation entry. 760 DT_PLTREL = 20, // Type of relocation entry used for linking. 761 DT_DEBUG = 21, // Reserved for debugger. 762 DT_TEXTREL = 22, // Relocations exist for non-writable segements. 763 DT_JMPREL = 23, // Address of relocations associated with PLT. 764 DT_BIND_NOW = 24, // Process all relocations before execution. 765 DT_INIT_ARRAY = 25, // Pointer to array of initialization functions. 766 DT_FINI_ARRAY = 26, // Pointer to array of termination functions. 767 DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY. 768 DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY. 769 DT_LOOS = 0x60000000, // Start of environment specific tags. 770 DT_HIOS = 0x6FFFFFFF, // End of environment specific tags. 771 DT_LOPROC = 0x70000000, // Start of processor specific tags. 772 DT_HIPROC = 0x7FFFFFFF // End of processor specific tags. 773}; 774 775} // end namespace ELF 776 777} // end namespace llvm 778 779#endif 780