// This header contains common, non-processor-specific data structures and
// constants for the ELF file format.
//
-// The details of the ELF32 bits in this file are largely based on
-// the Tool Interface Standard (TIS) Executable and Linking Format
-// (ELF) Specification Version 1.2, May 1995. The ELF64 stuff is not
-// standardized, as far as I can tell. It was largely based on information
-// I found in OpenBSD header files.
+// The details of the ELF32 bits in this file are largely based on the Tool
+// Interface Standard (TIS) Executable and Linking Format (ELF) Specification
+// Version 1.2, May 1995. The ELF64 stuff is based on ELF-64 Object File Format
+// Version 1.5, Draft 2, May 1998 as well as OpenBSD header files.
//
//===----------------------------------------------------------------------===//
// Object file magic string.
static const char ElfMagic[] = { 0x7f, 'E', 'L', 'F', '\0' };
+// e_ident size and indices.
+enum {
+ EI_MAG0 = 0, // File identification index.
+ EI_MAG1 = 1, // File identification index.
+ EI_MAG2 = 2, // File identification index.
+ EI_MAG3 = 3, // File identification index.
+ EI_CLASS = 4, // File class.
+ EI_DATA = 5, // Data encoding.
+ EI_VERSION = 6, // File version.
+ EI_OSABI = 7, // OS/ABI identification.
+ EI_ABIVERSION = 8, // ABI version.
+ EI_PAD = 9, // Start of padding bytes.
+ EI_NIDENT = 16 // Number of bytes in e_ident.
+};
+
struct Elf32_Ehdr {
- unsigned char e_ident[16]; // ELF Identification bytes
+ unsigned char e_ident[EI_NIDENT]; // ELF Identification bytes
Elf32_Half e_type; // Type of file (see ET_* below)
Elf32_Half e_machine; // Required architecture for this file (see EM_*)
Elf32_Word e_version; // Must be equal to 1
bool checkMagic() const {
return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
}
- unsigned char getFileClass() const { return e_ident[4]; }
- unsigned char getDataEncoding() { return e_ident[5]; }
+ unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
+ unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
};
// 64-bit ELF header. Fields are the same as for ELF32, but with different
// types (see above).
struct Elf64_Ehdr {
- unsigned char e_ident[16];
+ unsigned char e_ident[EI_NIDENT];
Elf64_Quarter e_type;
Elf64_Quarter e_machine;
Elf64_Half e_version;
Elf64_Quarter e_shentsize;
Elf64_Quarter e_shnum;
Elf64_Quarter e_shstrndx;
+ bool checkMagic() const {
+ return (memcmp(e_ident, ElfMagic, strlen(ElfMagic))) == 0;
+ }
+ unsigned char getFileClass() const { return e_ident[EI_CLASS]; }
+ unsigned char getDataEncoding() const { return e_ident[EI_DATA]; }
};
// File types
EM_860 = 7, // Intel 80860
EM_MIPS = 8, // MIPS R3000
EM_PPC = 20, // PowerPC
+ EM_PPC64 = 21, // PowerPC64
EM_ARM = 40, // ARM
EM_ALPHA = 41, // DEC Alpha
EM_SPARCV9 = 43, // SPARC V9
// Object file byte orderings.
enum {
+ ELFDATANONE = 0, // Invalid data encoding.
ELFDATA2LSB = 1, // Little-endian object file
ELFDATA2MSB = 2 // Big-endian object file
};
R_X86_64_TLSDESC = 36
};
+// i386 relocations.
+// TODO: this is just a subset
+enum {
+ R_386_NONE = 0,
+ R_386_32 = 1,
+ R_386_PC32 = 2,
+ R_386_GOT32 = 3,
+ R_386_PLT32 = 4,
+ R_386_COPY = 5,
+ R_386_GLOB_DAT = 6,
+ R_386_JUMP_SLOT = 7,
+ R_386_RELATIVE = 8,
+ R_386_GOTOFF = 9,
+ R_386_GOTPC = 10,
+ R_386_32PLT = 11,
+ R_386_16 = 20,
+ R_386_PC16 = 21,
+ R_386_8 = 22,
+ R_386_PC8 = 23
+};
+
// Section header.
struct Elf32_Shdr {
Elf32_Word sh_name; // Section name (index into string table)
// Section types.
enum {
- SHT_NULL = 0, // No associated section (inactive entry).
- SHT_PROGBITS = 1, // Program-defined contents.
- SHT_SYMTAB = 2, // Symbol table.
- SHT_STRTAB = 3, // String table.
- SHT_RELA = 4, // Relocation entries; explicit addends.
- SHT_HASH = 5, // Symbol hash table.
- SHT_DYNAMIC = 6, // Information for dynamic linking.
- SHT_NOTE = 7, // Information about the file.
- SHT_NOBITS = 8, // Data occupies no space in the file.
- SHT_REL = 9, // Relocation entries; no explicit addends.
- SHT_SHLIB = 10, // Reserved.
- SHT_DYNSYM = 11, // Symbol table.
- SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
- SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
- SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
- SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
+ SHT_NULL = 0, // No associated section (inactive entry).
+ SHT_PROGBITS = 1, // Program-defined contents.
+ SHT_SYMTAB = 2, // Symbol table.
+ SHT_STRTAB = 3, // String table.
+ SHT_RELA = 4, // Relocation entries; explicit addends.
+ SHT_HASH = 5, // Symbol hash table.
+ SHT_DYNAMIC = 6, // Information for dynamic linking.
+ SHT_NOTE = 7, // Information about the file.
+ SHT_NOBITS = 8, // Data occupies no space in the file.
+ SHT_REL = 9, // Relocation entries; no explicit addends.
+ SHT_SHLIB = 10, // Reserved.
+ SHT_DYNSYM = 11, // Symbol table.
+ SHT_INIT_ARRAY = 14, // Pointers to initialisation functions.
+ SHT_FINI_ARRAY = 15, // Pointers to termination functions.
+ SHT_PREINIT_ARRAY = 16, // Pointers to pre-init functions.
+ SHT_GROUP = 17, // Section group.
+ SHT_SYMTAB_SHNDX = 18, // Indicies for SHN_XINDEX entries.
+ SHT_LOOS = 0x60000000, // Lowest operating system-specific type.
+ SHT_HIOS = 0x6fffffff, // Highest operating system-specific type.
+ SHT_LOPROC = 0x70000000, // Lowest processor architecture-specific type.
+ SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
+ SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
+ SHT_HIUSER = 0xffffffff // Highest type reserved for applications.
};
// Section flags.
SHF_MASKPROC = 0xf0000000 // Bits indicating processor-specific flags.
};
-// Symbol table entries.
+// Symbol table entries for ELF32.
struct Elf32_Sym {
Elf32_Word st_name; // Symbol name (index into string table)
Elf32_Addr st_value; // Value or address associated with the symbol
}
};
+// Symbol table entries for ELF64.
+struct Elf64_Sym {
+ Elf64_Word st_name; // Symbol name (index into string table)
+ unsigned char st_info; // Symbol's type and binding attributes
+ unsigned char st_other; // Must be zero; reserved
+ Elf64_Half st_shndx; // Which section (header table index) it's defined in
+ Elf64_Addr st_value; // Value or address associated with the symbol
+ Elf64_Xword st_size; // Size of the symbol
+
+ // These accessors and mutators are identical to those defined for ELF32
+ // symbol table entries.
+ unsigned char getBinding() const { return st_info >> 4; }
+ unsigned char getType() const { return st_info & 0x0f; }
+ void setBinding(unsigned char b) { setBindingAndType(b, getType()); }
+ void setType(unsigned char t) { setBindingAndType(getBinding(), t); }
+ void setBindingAndType(unsigned char b, unsigned char t) {
+ st_info = (b << 4) + (t & 0x0f);
+ }
+};
+
+// The size (in bytes) of symbol table entries.
+enum {
+ SYMENTRY_SIZE32 = 16, // 32-bit symbol entry size
+ SYMENTRY_SIZE64 = 24 // 64-bit symbol entry size.
+};
+
// Symbol bindings.
enum {
STB_LOCAL = 0, // Local symbol, not visible outside obj file containing def
STT_FUNC = 2, // Symbol is executable code (function, etc.)
STT_SECTION = 3, // Symbol refers to a section
STT_FILE = 4, // Local, absolute symbol that refers to a file
+ STT_COMMON = 5, // An uninitialised common block
+ STT_TLS = 6, // Thread local data object
STT_LOPROC = 13, // Lowest processor-specific symbol type
STT_HIPROC = 15 // Highest processor-specific symbol type
};
+enum {
+ STV_DEFAULT = 0, // Visibility is specified by binding type
+ STV_INTERNAL = 1, // Defined by processor supplements
+ STV_HIDDEN = 2, // Not visible to other components
+ STV_PROTECTED = 3 // Visible in other components but not preemptable
+};
+
// Relocation entry, without explicit addend.
struct Elf32_Rel {
Elf32_Addr r_offset; // Location (file byte offset, or program virtual addr)
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf32_Word s, unsigned char t) {
r_info = (s << 8) + t;
- };
+ }
};
// Relocation entry with explicit addend.
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf32_Word s, unsigned char t) {
r_info = (s << 8) + t;
- };
+ }
};
// Relocation entry, without explicit addend.
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf64_Xword s, unsigned char t) {
r_info = (s << 32) + (t&0xffffffffL);
- };
+ }
};
// Relocation entry with explicit addend.
void setType(unsigned char t) { setSymbolAndType(getSymbol(), t); }
void setSymbolAndType(Elf64_Xword s, unsigned char t) {
r_info = (s << 32) + (t&0xffffffffL);
- };
+ }
};
-// Program header.
+// Program header for ELF32.
struct Elf32_Phdr {
Elf32_Word p_type; // Type of segment
Elf32_Off p_offset; // File offset where segment is located, in bytes
Elf32_Word p_align; // Segment alignment constraint
};
+// Program header for ELF64.
+struct Elf64_Phdr {
+ Elf64_Word p_type; // Type of segment
+ Elf64_Word p_flags; // Segment flags
+ Elf64_Off p_offset; // File offset where segment is located, in bytes
+ Elf64_Addr p_vaddr; // Virtual address of beginning of segment
+ Elf64_Addr p_paddr; // Physical address of beginning of segment (OS-specific)
+ Elf64_Xword p_filesz; // Num. of bytes in file image of segment (may be zero)
+ Elf64_Xword p_memsz; // Num. of bytes in mem image of segment (may be zero)
+ Elf64_Xword p_align; // Segment alignment constraint
+};
+
// Segment types.
enum {
PT_NULL = 0, // Unused segment.
PF_MASKPROC = 0xf0000000 // Unspecified
};
+// Dynamic table entry for ELF32.
+struct Elf32_Dyn
+{
+ Elf32_Sword d_tag; // Type of dynamic table entry.
+ union
+ {
+ Elf32_Word d_val; // Integer value of entry.
+ Elf32_Addr d_ptr; // Pointer value of entry.
+ } d_un;
+};
+
+// Dynamic table entry for ELF64.
+struct Elf64_Dyn
+{
+ Elf64_Sxword d_tag; // Type of dynamic table entry.
+ union
+ {
+ Elf64_Xword d_val; // Integer value of entry.
+ Elf64_Addr d_ptr; // Pointer value of entry.
+ } d_un;
+};
+
+// Dynamic table entry tags.
+enum {
+ DT_NULL = 0, // Marks end of dynamic array.
+ DT_NEEDED = 1, // String table offset of needed library.
+ DT_PLTRELSZ = 2, // Size of relocation entries in PLT.
+ DT_PLTGOT = 3, // Address associated with linkage table.
+ DT_HASH = 4, // Address of symbolic hash table.
+ DT_STRTAB = 5, // Address of dynamic string table.
+ DT_SYMTAB = 6, // Address of dynamic symbol table.
+ DT_RELA = 7, // Address of relocation table (Rela entries).
+ DT_RELASZ = 8, // Size of Rela relocation table.
+ DT_RELAENT = 9, // Size of a Rela relocation entry.
+ DT_STRSZ = 10, // Total size of the string table.
+ DT_SYMENT = 11, // Size of a symbol table entry.
+ DT_INIT = 12, // Address of initialization function.
+ DT_FINI = 13, // Address of termination function.
+ DT_SONAME = 14, // String table offset of a shared objects name.
+ DT_RPATH = 15, // String table offset of library search path.
+ DT_SYMBOLIC = 16, // Changes symbol resolution algorithm.
+ DT_REL = 17, // Address of relocation table (Rel entries).
+ DT_RELSZ = 18, // Size of Rel relocation table.
+ DT_RELENT = 19, // Size of a Rel relocation entry.
+ DT_PLTREL = 20, // Type of relocation entry used for linking.
+ DT_DEBUG = 21, // Reserved for debugger.
+ DT_TEXTREL = 22, // Relocations exist for non-writable segements.
+ DT_JMPREL = 23, // Address of relocations associated with PLT.
+ DT_BIND_NOW = 24, // Process all relocations before execution.
+ DT_INIT_ARRAY = 25, // Pointer to array of initialization functions.
+ DT_FINI_ARRAY = 26, // Pointer to array of termination functions.
+ DT_INIT_ARRAYSZ = 27, // Size of DT_INIT_ARRAY.
+ DT_FINI_ARRAYSZ = 28, // Size of DT_FINI_ARRAY.
+ DT_LOOS = 0x60000000, // Start of environment specific tags.
+ DT_HIOS = 0x6FFFFFFF, // End of environment specific tags.
+ DT_LOPROC = 0x70000000, // Start of processor specific tags.
+ DT_HIPROC = 0x7FFFFFFF // End of processor specific tags.
+};
+
} // end namespace ELF
} // end namespace llvm
projects / oota-llvm.git / blobdiff