1 //===-- llvm/Support/ELF.h - ELF constants and data structures --*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This header contains common, non-processor-specific data structures and
11 // constants for the ELF file format.
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.
18 //===----------------------------------------------------------------------===//
20 #ifndef LLVM_SUPPORT_ELF_H
21 #define LLVM_SUPPORT_ELF_H
23 #include "llvm/Support/DataTypes.h"
30 typedef uint32_t Elf32_Addr; // Program address
31 typedef uint16_t Elf32_Half;
32 typedef uint32_t Elf32_Off; // File offset
33 typedef int32_t Elf32_Sword;
34 typedef uint32_t Elf32_Word;
36 typedef uint64_t Elf64_Addr;
37 typedef uint64_t Elf64_Off;
38 typedef int32_t Elf64_Shalf;
39 typedef int32_t Elf64_Sword;
40 typedef uint32_t Elf64_Word;
41 typedef int64_t Elf64_Sxword;
42 typedef uint64_t Elf64_Xword;
43 typedef uint32_t Elf64_Half;
44 typedef uint16_t Elf64_Quarter;
46 // Object file magic string.
47 static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
49 // e_ident size and indices.
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.
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;
82 unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
83 unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
86 // 64-bit ELF header. Fields are the same as for ELF32, but with different
89 unsigned char e_ident[EI_NIDENT];
91 Elf64_Quarter e_machine;
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;
106 unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
107 unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
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
127 // Machine architectures
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
141 EM_ALPHA = 41, // DEC Alpha
142 EM_SPARCV9 = 43, // SPARC V9
143 EM_X86_64 = 62, // AMD64
144 EM_MBLAZE = 47787 // Xilinx MicroBlaze
147 // Object file classes.
150 ELFCLASS32 = 1, // 32-bit object file
151 ELFCLASS64 = 2 // 64-bit object file
154 // Object file byte orderings.
156 ELFDATANONE = 0, // Invalid data encoding.
157 ELFDATA2LSB = 1, // Little-endian object file
158 ELFDATA2MSB = 2 // Big-endian object file
161 // OS ABI identification.
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
185 // X86_64 relocations.
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,
203 R_X86_64_DTPMOD64 = 16,
204 R_X86_64_DTPOFF64 = 17,
205 R_X86_64_TPOFF64 = 18,
208 R_X86_64_DTPOFF32 = 21,
209 R_X86_64_GOTTPOFF = 22,
210 R_X86_64_TPOFF32 = 23,
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
222 // TODO: this is just a subset
236 R_386_TLS_TPOFF = 14,
238 R_386_TLS_GOTIE = 16,
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,
263 R_386_IRELATIVE = 42,
267 // MBlaze relocations.
269 R_MICROBLAZE_NONE = 0,
271 R_MICROBLAZE_32_PCREL = 2,
272 R_MICROBLAZE_64_PCREL = 3,
273 R_MICROBLAZE_32_PCREL_LO = 4,
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
294 // ARM Specific e_flags
295 enum { EF_ARM_EABIMASK = 0xFF000000U };
297 // ELF Relocation types for ARM
298 // Meets 2.08 ABI Specs.
305 R_ARM_LDR_PC_G0 = 0x04,
308 R_ARM_THM_ABS5 = 0x07,
310 R_ARM_SBREL32 = 0x09,
311 R_ARM_THM_CALL = 0x0a,
312 R_ARM_THM_PC8 = 0x0b,
313 R_ARM_BREL_ADJ = 0x0c,
314 R_ARM_TLS_DESC = 0x0d,
315 R_ARM_THM_SWI8 = 0x0e,
317 R_ARM_THM_XPC22 = 0x10,
318 R_ARM_TLS_DTPMOD32 = 0x11,
319 R_ARM_TLS_DTPOFF32 = 0x12,
320 R_ARM_TLS_TPOFF32 = 0x13,
322 R_ARM_GLOB_DAT = 0x15,
323 R_ARM_JUMP_SLOT = 0x16,
324 R_ARM_RELATIVE = 0x17,
325 R_ARM_GOTOFF32 = 0x18,
326 R_ARM_BASE_PREL = 0x19,
327 R_ARM_GOT_BREL = 0x1a,
331 R_ARM_THM_JUMP24 = 0x1e,
332 R_ARM_BASE_ABS = 0x1f,
333 R_ARM_ALU_PCREL_7_0 = 0x20,
334 R_ARM_ALU_PCREL_15_8 = 0x21,
335 R_ARM_ALU_PCREL_23_15 = 0x22,
336 R_ARM_LDR_SBREL_11_0_NC = 0x23,
337 R_ARM_ALU_SBREL_19_12_NC = 0x24,
338 R_ARM_ALU_SBREL_27_20_CK = 0x25,
339 R_ARM_TARGET1 = 0x26,
340 R_ARM_SBREL31 = 0x27,
342 R_ARM_TARGET2 = 0x29,
344 R_ARM_MOVW_ABS_NC = 0x2b,
345 R_ARM_MOVT_ABS = 0x2c,
346 R_ARM_MOVW_PREL_NC = 0x2d,
347 R_ARM_MOVT_PREL = 0x2e,
348 R_ARM_THM_MOVW_ABS_NC = 0x2f,
349 R_ARM_THM_MOVT_ABS = 0x30,
350 R_ARM_THM_MOVW_PREL_NC = 0x31,
351 R_ARM_THM_MOVT_PREL = 0x32,
352 R_ARM_THM_JUMP19 = 0x33,
353 R_ARM_THM_JUMP6 = 0x34,
354 R_ARM_THM_ALU_PREL_11_0 = 0x35,
355 R_ARM_THM_PC12 = 0x36,
356 R_ARM_ABS32_NOI = 0x37,
357 R_ARM_REL32_NOI = 0x38,
358 R_ARM_ALU_PC_G0_NC = 0x39,
359 R_ARM_ALU_PC_G0 = 0x3a,
360 R_ARM_ALU_PC_G1_NC = 0x3b,
361 R_ARM_ALU_PC_G1 = 0x3c,
362 R_ARM_ALU_PC_G2 = 0x3d,
363 R_ARM_LDR_PC_G1 = 0x3e,
364 R_ARM_LDR_PC_G2 = 0x3f,
365 R_ARM_LDRS_PC_G0 = 0x40,
366 R_ARM_LDRS_PC_G1 = 0x41,
367 R_ARM_LDRS_PC_G2 = 0x42,
368 R_ARM_LDC_PC_G0 = 0x43,
369 R_ARM_LDC_PC_G1 = 0x44,
370 R_ARM_LDC_PC_G2 = 0x45,
371 R_ARM_ALU_SB_G0_NC = 0x46,
372 R_ARM_ALU_SB_G0 = 0x47,
373 R_ARM_ALU_SB_G1_NC = 0x48,
374 R_ARM_ALU_SB_G1 = 0x49,
375 R_ARM_ALU_SB_G2 = 0x4a,
376 R_ARM_LDR_SB_G0 = 0x4b,
377 R_ARM_LDR_SB_G1 = 0x4c,
378 R_ARM_LDR_SB_G2 = 0x4d,
379 R_ARM_LDRS_SB_G0 = 0x4e,
380 R_ARM_LDRS_SB_G1 = 0x4f,
381 R_ARM_LDRS_SB_G2 = 0x50,
382 R_ARM_LDC_SB_G0 = 0x51,
383 R_ARM_LDC_SB_G1 = 0x52,
384 R_ARM_LDC_SB_G2 = 0x53,
385 R_ARM_MOVW_BREL_NC = 0x54,
386 R_ARM_MOVT_BREL = 0x55,
387 R_ARM_MOVW_BREL = 0x56,
388 R_ARM_THM_MOVW_BREL_NC = 0x57,
389 R_ARM_THM_MOVT_BREL = 0x58,
390 R_ARM_THM_MOVW_BREL = 0x59,
391 R_ARM_TLS_GOTDESC = 0x5a,
392 R_ARM_TLS_CALL = 0x5b,
393 R_ARM_TLS_DESCSEQ = 0x5c,
394 R_ARM_THM_TLS_CALL = 0x5d,
395 R_ARM_PLT32_ABS = 0x5e,
396 R_ARM_GOT_ABS = 0x5f,
397 R_ARM_GOT_PREL = 0x60,
398 R_ARM_GOT_BREL12 = 0x61,
399 R_ARM_GOTOFF12 = 0x62,
400 R_ARM_GOTRELAX = 0x63,
401 R_ARM_GNU_VTENTRY = 0x64,
402 R_ARM_GNU_VTINHERIT = 0x65,
403 R_ARM_THM_JUMP11 = 0x66,
404 R_ARM_THM_JUMP8 = 0x67,
405 R_ARM_TLS_GD32 = 0x68,
406 R_ARM_TLS_LDM32 = 0x69,
407 R_ARM_TLS_LDO32 = 0x6a,
408 R_ARM_TLS_IE32 = 0x6b,
409 R_ARM_TLS_LE32 = 0x6c,
410 R_ARM_TLS_LDO12 = 0x6d,
411 R_ARM_TLS_LE12 = 0x6e,
412 R_ARM_TLS_IE12GP = 0x6f,
413 R_ARM_PRIVATE_0 = 0x70,
414 R_ARM_PRIVATE_1 = 0x71,
415 R_ARM_PRIVATE_2 = 0x72,
416 R_ARM_PRIVATE_3 = 0x73,
417 R_ARM_PRIVATE_4 = 0x74,
418 R_ARM_PRIVATE_5 = 0x75,
419 R_ARM_PRIVATE_6 = 0x76,
420 R_ARM_PRIVATE_7 = 0x77,
421 R_ARM_PRIVATE_8 = 0x78,
422 R_ARM_PRIVATE_9 = 0x79,
423 R_ARM_PRIVATE_10 = 0x7a,
424 R_ARM_PRIVATE_11 = 0x7b,
425 R_ARM_PRIVATE_12 = 0x7c,
426 R_ARM_PRIVATE_13 = 0x7d,
427 R_ARM_PRIVATE_14 = 0x7e,
428 R_ARM_PRIVATE_15 = 0x7f,
430 R_ARM_THM_TLS_DESCSEQ16 = 0x81,
431 R_ARM_THM_TLS_DESCSEQ32 = 0x82
438 Elf32_Word sh_name; // Section name (index into string table)
439 Elf32_Word sh_type; // Section type (SHT_*)
440 Elf32_Word sh_flags; // Section flags (SHF_*)
441 Elf32_Addr sh_addr; // Address where section is to be loaded
442 Elf32_Off sh_offset; // File offset of section data, in bytes
443 Elf32_Word sh_size; // Size of section, in bytes
444 Elf32_Word sh_link; // Section type-specific header table index link
445 Elf32_Word sh_info; // Section type-specific extra information
446 Elf32_Word sh_addralign; // Section address alignment
447 Elf32_Word sh_entsize; // Size of records contained within the section
450 // Section header for ELF64 - same fields as ELF32, different types.
454 Elf64_Xword sh_flags;
460 Elf64_Xword sh_addralign;
461 Elf64_Xword sh_entsize;
464 // Special section indices.
466 SHN_UNDEF = 0, // Undefined, missing, irrelevant, or meaningless
467 SHN_LORESERVE = 0xff00, // Lowest reserved index
468 SHN_LOPROC = 0xff00, // Lowest processor-specific index
469 SHN_HIPROC = 0xff1f, // Highest processor-specific index
470 SHN_ABS = 0xfff1, // Symbol has absolute value; does not need relocation
471 SHN_COMMON = 0xfff2, // FORTRAN COMMON or C external global variables
472 SHN_XINDEX = 0xffff, // Mark that the index is >= SHN_LORESERVE
473 SHN_HIRESERVE = 0xffff // Highest reserved index
478 SHT_NULL = 0, // No associated section (inactive entry).
479 SHT_PROGBITS = 1, // Program-defined contents.
480 SHT_SYMTAB = 2, // Symbol table.
481 SHT_STRTAB = 3, // String table.
482 SHT_RELA = 4, // Relocation entries; explicit addends.
483 SHT_HASH = 5, // Symbol hash table.
484 SHT_DYNAMIC = 6, // Information for dynamic linking.
485 SHT_NOTE = 7, // Information about the file.
486 SHT_NOBITS = 8, // Data occupies no space in the file.
487 SHT_REL = 9, // Relocation entries; no explicit addends.
488 SHT_SHLIB = 10, // Reserved.
489 SHT_DYNSYM = 11, // Symbol table.
490 SHT_INIT_ARRAY = 14, // Pointers to initialization functions.
491 SHT_FINI_ARRAY = 15, // Pointers to termination functions.
492 SHT_PREINIT_ARRAY = 16, // Pointers to pre-init functions.
493 SHT_GROUP = 17, // Section group.
494 SHT_SYMTAB_SHNDX = 18, // Indices for SHN_XINDEX entries.
495 SHT_LOOS = 0x60000000, // Lowest operating system-specific type.
496 SHT_HIOS = 0x6fffffff, // Highest operating system-specific type.
497 SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
498 // Fixme: All this is duplicated in MCSectionELF. Why??
499 // Exception Index table
500 SHT_ARM_EXIDX = 0x70000001U,
501 // BPABI DLL dynamic linking pre-emption map
502 SHT_ARM_PREEMPTMAP = 0x70000002U,
503 // Object file compatibility attributes
504 SHT_ARM_ATTRIBUTES = 0x70000003U,
505 SHT_ARM_DEBUGOVERLAY = 0x70000004U,
506 SHT_ARM_OVERLAYSECTION = 0x70000005U,
508 SHT_X86_64_UNWIND = 0x70000001, // Unwind information
510 SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
511 SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
512 SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
517 // Section data should be writable during execution.
520 // Section occupies memory during program execution.
523 // Section contains executable machine instructions.
526 // The data in this section may be merged.
529 // The data in this section is null-terminated strings.
532 // A field in this section holds a section header table index.
533 SHF_INFO_LINK = 0x40U,
535 // Adds special ordering requirements for link editors.
536 SHF_LINK_ORDER = 0x80U,
538 // This section requires special OS-specific processing to avoid incorrect
540 SHF_OS_NONCONFORMING = 0x100U,
542 // This section is a member of a section group.
545 // This section holds Thread-Local Storage.
548 // Start of target-specific flags.
550 /// XCORE_SHF_CP_SECTION - All sections with the "c" flag are grouped
551 /// together by the linker to form the constant pool and the cp register is
552 /// set to the start of the constant pool by the boot code.
553 XCORE_SHF_CP_SECTION = 0x800U,
555 /// XCORE_SHF_DP_SECTION - All sections with the "d" flag are grouped
556 /// together by the linker to form the data section and the dp register is
557 /// set to the start of the section by the boot code.
558 XCORE_SHF_DP_SECTION = 0x1000U,
560 // Bits indicating processor-specific flags.
561 SHF_MASKPROC = 0xf0000000
564 // Section Group Flags
567 GRP_MASKOS = 0x0ff00000,
568 GRP_MASKPROC = 0xf0000000
571 // Symbol table entries for ELF32.
573 Elf32_Word st_name; // Symbol name (index into string table)
574 Elf32_Addr st_value; // Value or address associated with the symbol
575 Elf32_Word st_size; // Size of the symbol
576 unsigned char st_info; // Symbol's type and binding attributes
577 unsigned char st_other; // Must be zero; reserved
578 Elf32_Half st_shndx; // Which section (header table index) it's defined in
580 // These accessors and mutators correspond to the ELF32_ST_BIND,
581 // ELF32_ST_TYPE, and ELF32_ST_INFO macros defined in the ELF specification:
582 unsigned char getBinding() const { return st_info >> 4; }
583 unsigned char getType() const { return st_info & 0x0f; }
584 void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
585 void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
586 void setBindingAndType(unsigned char b, unsigned char t) {
587 st_info = (b << 4) + (t & 0x0f);
591 // Symbol table entries for ELF64.
593 Elf64_Word st_name; // Symbol name (index into string table)
594 unsigned char st_info; // Symbol's type and binding attributes
595 unsigned char st_other; // Must be zero; reserved
596 Elf64_Half st_shndx; // Which section (header table index) it's defined in
597 Elf64_Addr st_value; // Value or address associated with the symbol
598 Elf64_Xword st_size; // Size of the symbol
600 // These accessors and mutators are identical to those defined for ELF32
601 // symbol table entries.
602 unsigned char getBinding() const { return st_info >> 4; }
603 unsigned char getType() const { return st_info & 0x0f; }
604 void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
605 void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
606 void setBindingAndType(unsigned char b, unsigned char t) {
607 st_info = (b << 4) + (t & 0x0f);
611 // The size (in bytes) of symbol table entries.
613 SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size
614 SYMENTRY_SIZE64 = 24 // 64-bit symbol entry size.
619 STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
620 STB_GLOBAL = 1, // Global symbol, visible to all object files being combined
621 STB_WEAK = 2, // Weak symbol, like global but lower-precedence
622 STB_LOPROC = 13, // Lowest processor-specific binding type
623 STB_HIPROC = 15 // Highest processor-specific binding type
628 STT_NOTYPE = 0, // Symbol's type is not specified
629 STT_OBJECT = 1, // Symbol is a data object (variable, array, etc.)
630 STT_FUNC = 2, // Symbol is executable code (function, etc.)
631 STT_SECTION = 3, // Symbol refers to a section
632 STT_FILE = 4, // Local, absolute symbol that refers to a file
633 STT_COMMON = 5, // An uninitialized common block
634 STT_TLS = 6, // Thread local data object
635 STT_LOPROC = 13, // Lowest processor-specific symbol type
636 STT_HIPROC = 15 // Highest processor-specific symbol type
640 STV_DEFAULT = 0, // Visibility is specified by binding type
641 STV_INTERNAL = 1, // Defined by processor supplements
642 STV_HIDDEN = 2, // Not visible to other components
643 STV_PROTECTED = 3 // Visible in other components but not preemptable
646 // Relocation entry, without explicit addend.
648 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
649 Elf32_Word r_info; // Symbol table index and type of relocation to apply
651 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
652 // and ELF32_R_INFO macros defined in the ELF specification:
653 Elf32_Word getSymbol() const { return (r_info >> 8); }
654 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); }
655 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
656 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
657 void setSymbolAndType(Elf32_Word s, unsigned char t) {
658 r_info = (s << 8) + t;
662 // Relocation entry with explicit addend.
664 Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
665 Elf32_Word r_info; // Symbol table index and type of relocation to apply
666 Elf32_Sword r_addend; // Compute value for relocatable field by adding this
668 // These accessors and mutators correspond to the ELF32_R_SYM, ELF32_R_TYPE,
669 // and ELF32_R_INFO macros defined in the ELF specification:
670 Elf32_Word getSymbol() const { return (r_info >> 8); }
671 unsigned char getType() const { return (unsigned char) (r_info & 0x0ff); }
672 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
673 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
674 void setSymbolAndType(Elf32_Word s, unsigned char t) {
675 r_info = (s << 8) + t;
679 // Relocation entry, without explicit addend.
681 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
682 Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
684 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
685 // and ELF64_R_INFO macros defined in the ELF specification:
686 Elf64_Xword getSymbol() const { return (r_info >> 32); }
687 unsigned char getType() const {
688 return (unsigned char) (r_info & 0xffffffffL);
690 void setSymbol(Elf32_Word s) { setSymbolAndType(s, getType()); }
691 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
692 void setSymbolAndType(Elf64_Xword s, unsigned char t) {
693 r_info = (s << 32) + (t&0xffffffffL);
697 // Relocation entry with explicit addend.
699 Elf64_Addr r_offset; // Location (file byte offset, or program virtual addr).
700 Elf64_Xword r_info; // Symbol table index and type of relocation to apply.
701 Elf64_Sxword r_addend; // Compute value for relocatable field by adding this.
703 // These accessors and mutators correspond to the ELF64_R_SYM, ELF64_R_TYPE,
704 // and ELF64_R_INFO macros defined in the ELF specification:
705 Elf64_Xword getSymbol() const { return (r_info >> 32); }
706 unsigned char getType() const {
707 return (unsigned char) (r_info & 0xffffffffL);
709 void setSymbol(Elf64_Xword s) { setSymbolAndType(s, getType()); }
710 void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
711 void setSymbolAndType(Elf64_Xword s, unsigned char t) {
712 r_info = (s << 32) + (t&0xffffffffL);
716 // Program header for ELF32.
718 Elf32_Word p_type; // Type of segment
719 Elf32_Off p_offset; // File offset where segment is located, in bytes
720 Elf32_Addr p_vaddr; // Virtual address of beginning of segment
721 Elf32_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
722 Elf32_Word p_filesz; // Num. of bytes in file image of segment (may be zero)
723 Elf32_Word p_memsz; // Num. of bytes in mem image of segment (may be zero)
724 Elf32_Word p_flags; // Segment flags
725 Elf32_Word p_align; // Segment alignment constraint
728 // Program header for ELF64.
730 Elf64_Word p_type; // Type of segment
731 Elf64_Word p_flags; // Segment flags
732 Elf64_Off p_offset; // File offset where segment is located, in bytes
733 Elf64_Addr p_vaddr; // Virtual address of beginning of segment
734 Elf64_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
735 Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
736 Elf64_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero)
737 Elf64_Xword p_align; // Segment alignment constraint
742 PT_NULL = 0, // Unused segment.
743 PT_LOAD = 1, // Loadable segment.
744 PT_DYNAMIC = 2, // Dynamic linking information.
745 PT_INTERP = 3, // Interpreter pathname.
746 PT_NOTE = 4, // Auxiliary information.
747 PT_SHLIB = 5, // Reserved.
748 PT_PHDR = 6, // The program header table itself.
749 PT_LOPROC = 0x70000000, // Lowest processor-specific program hdr entry type.
750 PT_HIPROC = 0x7fffffff // Highest processor-specific program hdr entry type.
753 // Segment flag bits.
758 PF_MASKPROC = 0xf0000000 // Unspecified
761 // Dynamic table entry for ELF32.
764 Elf32_Sword d_tag; // Type of dynamic table entry.
767 Elf32_Word d_val; // Integer value of entry.
768 Elf32_Addr d_ptr; // Pointer value of entry.
772 // Dynamic table entry for ELF64.
775 Elf64_Sxword d_tag; // Type of dynamic table entry.
778 Elf64_Xword d_val; // Integer value of entry.
779 Elf64_Addr d_ptr; // Pointer value of entry.
783 // Dynamic table entry tags.
785 DT_NULL = 0, // Marks end of dynamic array.
786 DT_NEEDED = 1, // String table offset of needed library.
787 DT_PLTRELSZ = 2, // Size of relocation entries in PLT.
788 DT_PLTGOT = 3, // Address associated with linkage table.
789 DT_HASH = 4, // Address of symbolic hash table.
790 DT_STRTAB = 5, // Address of dynamic string table.
791 DT_SYMTAB = 6, // Address of dynamic symbol table.
792 DT_RELA = 7, // Address of relocation table (Rela entries).
793 DT_RELASZ = 8, // Size of Rela relocation table.
794 DT_RELAENT = 9, // Size of a Rela relocation entry.
795 DT_STRSZ = 10, // Total size of the string table.
796 DT_SYMENT = 11, // Size of a symbol table entry.
797 DT_INIT = 12, // Address of initialization function.
798 DT_FINI = 13, // Address of termination function.
799 DT_SONAME = 14, // String table offset of a shared objects name.
800 DT_RPATH = 15, // String table offset of library search path.
801 DT_SYMBOLIC = 16, // Changes symbol resolution algorithm.
802 DT_REL = 17, // Address of relocation table (Rel entries).
803 DT_RELSZ = 18, // Size of Rel relocation table.
804 DT_RELENT = 19, // Size of a Rel relocation entry.
805 DT_PLTREL = 20, // Type of relocation entry used for linking.
806 DT_DEBUG = 21, // Reserved for debugger.
807 DT_TEXTREL = 22, // Relocations exist for non-writable segments.
808 DT_JMPREL = 23, // Address of relocations associated with PLT.
809 DT_BIND_NOW = 24, // Process all relocations before execution.
810 DT_INIT_ARRAY = 25, // Pointer to array of initialization functions.
811 DT_FINI_ARRAY = 26, // Pointer to array of termination functions.
812 DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY.
813 DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY.
814 DT_LOOS = 0x60000000, // Start of environment specific tags.
815 DT_HIOS = 0x6FFFFFFF, // End of environment specific tags.
816 DT_LOPROC = 0x70000000, // Start of processor specific tags.
817 DT_HIPROC = 0x7FFFFFFF // End of processor specific tags.
820 } // end namespace ELF
822 } // end namespace llvm