#ifndef _ELF_H #define _ELF_H #include /* ELF object file types */ #define ELF_TYPE_NONE 0 /* no file type */ #define ELF_TYPE_REL 1 /* relocatable file */ #define ELF_TYPE_EXEC 2 /* executable file */ #define ELF_TYPE_DYN 3 /* shared object file */ #define ELF_TYPE_CORE 4 /* core file */ #define ELF_TYPE_LOPROC 0xff00 /* cpu specific */ #define ELF_TYPE_HIPROC 0xffff /* ELF machine types */ #define ELF_MACH_NONE 0 /* no machine type */ #define ELF_MACH_M32 1 /* AT&T WE 32100 */ #define ELF_MACH_SPARC 2 /* Sun SPARC */ #define ELF_MACH_386 3 /* Intel i386 */ #define ELF_MACH_68K 4 /* Motorola 68000 */ #define ELF_MACH_88K 5 /* Motorola 88000 */ #define ELF_MACH_860 7 /* Intel 80860 */ #define ELF_MACH_MIPS 8 /* MIPS RS3000 Big-Endian */ #define ELF_MACH_MIPS_R4K_BE 10 /* MIPS RS4000 Big-Endian */ /* 11-16 are reserved */ /* ELF Version */ #define ELF_VER_NONE 0 /* invalid version */ #define ELF_VER_CURRENT 1 /* Current ELF version */ /* ELF Header Structure */ #define ELF_IDENT_COUNT 16 struct elf32_header { uint8_t ident[ELF_IDENT_COUNT]; /* key fields */ uint16_t type; /* object file type */ uint16_t machine; /* architecture */ uint32_t version; /* object file version */ uint32_t entry; /* entry point */ uint32_t phoff; /* program header offset */ uint32_t shoff; /* section header offset */ uint32_t flags; /* ELF file flags */ uint16_t ehsize; /* ELF header size */ uint16_t phentsize; /* size of a program header entry */ uint16_t phnum; /* number of entries in the program header */ uint16_t shentsize; /* size of a section header entry */ uint16_t shnum; /* number of section header entries */ uint16_t shstrndx; /* index of string table entry in the section hdr */ }; /* ELF magic */ #define ELF_MAGIC_1 0x7f #define ELF_MAGIC_2 0x45 #define ELF_MAGIC_3 0x4c #define ELF_MAGIC_4 0x46 /* ELF class */ #define ELF_CLASS_NONE 0 #define ELF_CLASS_32 1 #define ELF_CLASS_64 2 /* ELF Data Encoding */ #define ELF_DATA_NONE 0 /* invalid */ #define ELF_DATA_LSB 1 /* Little endian */ #define ELF_DATA_MSB 2 /* big endian */ /* Offsets within the ident string */ #define ELF_INDEX_MAGIC0 0 #define ELF_INDEX_MAGIC1 1 #define ELF_INDEX_MAGIC2 2 #define ELF_INDEX_MAGIC3 3 #define ELF_INDEX_CLASS 4 /* file class */ #define ELF_INDEX_DATA 5 /* data encoding */ #define ELF_INDEX_VERSION 6 /* file version */ #define ELF_INDEX_PADDING 7 /* start of padding */ /* Special Section Header Indexes */ #define ELF_SH_UNDEF 0 /* no section header present */ #define ELF_SH_LORESERVE 0xff00 /* lower-bound of reserved indices */ #define ELF_SH_LOPROC 0xff00 /* processor-specifc semantics low bound */ #define ELF_SH_HIPROC 0xff1f /* processor-specific semantics high bound */ #define ELF_SH_ABS 0xfff1 /* abs values for symbols in this section */ #define ELF_SH_COMMON 0xfff2 /* Common Block/unallocated extern vars */ #define ELF_SH_HIRESERVE 0xffff /* high value for reserved indices */ /* Section Header Structure */ struct elf32_section_header { uint32_t name; /* index of the string table entry for this section */ uint32_t type; /* section type */ uint32_t flags; /* section flags */ uint32_t addr; /* section address if in actual memory image */ uint32_t offset; /* byte offset from beginning of file to start of sect. */ uint32_t size; /* size of section in bytes */ uint32_t link; /* section header table index link */ uint32_t info; /* extra information */ uint32_t addralign; /* alignment constraints */ uint32_t entsize; /* per-entry size */ }; /* Section Types */ #define ELF_SHT_NULL 0 /* inactive/no associated section */ #define ELF_SHT_PROGBITS 1 /* program-specific information */ #define ELF_SHT_SYMTAB 2 /* Symbol table */ #define ELF_SHT_STRTAB 3 /* string table */ #define ELF_SHT_RELA 4 /* Relocation entries with explicit addends */ #define ELF_SHT_HASH 5 /* symbol hash table */ #define ELF_SHT_DYNAMIC 6 /* dynamic linking information */ #define ELF_SHT_NOTE 7 /* notational marking */ #define ELF_SHT_NOBITS 8 /* no space in file, looks like progbits */ #define ELF_SHT_REL 9 /* relocation entires without explicit addends */ #define ELF_SHT_SHLIB 10 /* reserved; non-ABI conformant code */ #define ELF_SHT_DYNSYM 11 /* symbol table */ #define ELF_SHT_LOPROC 0x70000000 /* region reserved for CPU-specific info */ #define ELF_SHT_HIPROC 0x7fffffff #define ELF_SHT_LOUSER 0x80000000 /* section reseverd for prog. info */ #define ELF_SHT_HIUSER 0xffffffff /* Section header flags */ #define ELF_SHF_WRITE 0x1 /* Contains writable data */ #define ELF_SHF_ALLOC 0x2 /* occupies memory during exec */ #define ELF_SHF_EXECINSTR 0x4 /* contains executable instructions */ #define ELF_SHF_MASKPROC 0xf0000000 /* Processor-specific mask bits */ #define ELF_SHF_WRITABLE(x) ((x) & ELF_SHF_WRITE) #define ELF_SHF_ALLOCD(x) ((x) & ELF_SHF_ALLOC) #define ELF_SHF_EXECUTABLE(x) ((x) & ELF_SHF_EXECINSTR) /* Symbol Table */ #define ELF_STN_UNDEF 0 /* ELF Spec, p. 4-22 */ struct elf32_sym_table_entry { uint32_t name; /* string table entry */ uint32_t value; /* value of the symbol */ uint32_t size; /* size of the symbol */ uint8_t info; /* symbol's type and binding attribs */ uint8_t other; /* no defined meaning */ uint16_t shndx; /* associated section header table index */ }; #define ELF_ST_BIND(i) ((i) >> 4) #define ELF_ST_TYPE(i) ((i) & 0xf) #define ELF_ST_INFO(b, t) (((b)<<4) + ((t) & 0xf)) /* symbol binding (use with ELF_ST_BIND */ #define ELF_STB_LOCAL 0 /* not visible outside of this object file */ #define ELF_STB_GLOBAL 1 /* visible to all object files being combined */ #define ELF_STB_WEAK 2 /* Weak bound symbols (lower precedence than glbl */ #define ELF_STB_LOPROC 13 /* Processor specific semantics range */ #define ELF_STB_HIPROC 15 /* symbol type (use with ELF_ST_TYPE macro) */ #define ELF_STT_NOTYPE 0 /* type is not specified */ #define ELF_STT_OBJECT 1 /* symbol is associated with a data object */ #define ELF_STT_FUNC 2 /* symbol is associated with executable code */ #define ELF_STT_SECTION 3 /* symbol is associated with a section */ #define ELF_STT_FILE 4 /* file symbol type */ #define ELF_STT_LOPROC 13 /* processor specific semantics range */ #define ELF_STT_HIPROC 15 /* Relocation Entries */ struct elf32_rel { uint32_t offset; /* where to apply relocation action */ uint32_t info; /* information about the symbol */ }; struct elf32_rel_add { uint32_t offset; /* where to apply relocation action */ uint32_t info; /* information about the symbol */ uint32_t addend; /* constant addend */ }; /* Info helper macros: */ #define ELF_REL_SYM(i) ((i) >> 8) #define ELF_REL_TYPE(i) ((uint8_t)(i)) #define ELF_REL_INFO(s, t) (((s) << 8) + (unsigned char)(t)) /* Program Header/Segments */ struct elf32_phdr { uint32_t type; /* segment type */ uint32_t offset; /* offset from beginning of file */ uint32_t vaddr; /* virtual address of first byte of segment */ uint32_t paddr; /* physical address of first byte of segment */ uint32_t filesz; /* size in file of this segment */ uint32_t memsz; /* Size of segment in memory image */ uint32_t flags; /* segment flags */ uint32_t align; /* alignment requirements for loading */ }; /* Segment Types */ #define ELF_PT_NULL 0 /* unused */ #define ELF_PT_LOAD 1 /* loadable segment */ #define ELF_PT_DYNAMIC 2 /* dynamic section */ #define ELF_PT_INTERP 3 /* null-terminate path to an invokable interpreter */ #define ELF_PT_NOTE 4 /* Auxiliary information */ #define ELF_PT_SHLIB 5 /* Shared Library? No ABI conformity required */ #define ELF_PT_PHDR 6 /* Program header table size */ #define ELF_PT_LOPROC 0x70000000 /* processor-specific values */ #define ELF_PT_HIPROC 0x7fffffff #endif /* _ELF_H */