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