186 lines
3.7 KiB
C
186 lines
3.7 KiB
C
/* vim: tabstop=4 shiftwidth=4 noexpandtab
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*
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* ELF Binary Executable headers
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*
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*/
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#pragma once
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/*
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* Different bits of our build environment
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* require different header files for definitions
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*/
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#ifdef _KERNEL_
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# include <kernel/types.h>
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#else
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# include <stdint.h>
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#endif
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/*
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* Unless otherwise stated, the definitions herein
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* are sourced from the Portable Formats Specification,
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* version 1.1 - ELF: Executable and Linkable Format
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*/
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/*
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* ELF Magic Signature
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*/
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#define ELFMAG0 0x7f
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#define ELFMAG1 'E'
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#define ELFMAG2 'L'
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#define ELFMAG3 'F'
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#define EI_NIDENT 16
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/*
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* ELF Datatypes
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*/
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typedef uint32_t Elf32_Word;
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typedef uint32_t Elf32_Addr;
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typedef uint32_t Elf32_Off;
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typedef uint32_t Elf32_Sword;
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typedef uint16_t Elf32_Half;
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/*
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* ELF Header
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*/
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typedef struct {
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unsigned char e_ident[EI_NIDENT];
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Elf32_Half e_type;
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Elf32_Half e_machine;
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Elf32_Word e_version;
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Elf32_Addr e_entry;
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Elf32_Off e_phoff;
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Elf32_Off e_shoff;
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Elf32_Word e_flags;
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Elf32_Half e_ehsize;
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Elf32_Half e_phentsize;
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Elf32_Half e_phnum;
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Elf32_Half e_shentsize;
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Elf32_Half e_shnum;
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Elf32_Half e_shstrndx;
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} Elf32_Header;
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/*
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* e_type
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*/
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#define ET_NONE 0 /* No file type */
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#define ET_REL 1 /* Relocatable file */
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#define ET_EXEC 2 /* Executable file */
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#define ET_DYN 3 /* Shared object file */
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#define ET_CORE 4 /* Core file */
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#define ET_LOPROC 0xff0 /* [Processor Specific] */
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#define ET_HIPROC 0xfff /* [Processor Specific] */
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/*
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* Machine types
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*/
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#define EM_NONE 0
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#define EM_386 3
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#define EV_NONE 0
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#define EV_CURRENT 1
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/** Program Header */
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typedef struct {
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Elf32_Word p_type;
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Elf32_Off p_offset;
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Elf32_Addr p_vaddr;
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Elf32_Addr p_paddr;
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Elf32_Word p_filesz;
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Elf32_Word p_memsz;
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Elf32_Word p_flags;
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Elf32_Word p_align;
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} Elf32_Phdr;
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/* p_type values */
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#define PT_NULL 0 /* Unused, skip me */
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#define PT_LOAD 1 /* Loadable segment */
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#define PT_DYNAMIC 2 /* Dynamic linking information */
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#define PT_INTERP 3 /* Interpreter (null-terminated string, pathname) */
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#define PT_NOTE 4 /* Auxillary information */
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#define PT_SHLIB 5 /* Reserved. */
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#define PT_PHDR 6 /* Oh, it's me. Hello! Back-reference to the header table itself */
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#define PT_LOPROC 0x70000000
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#define PT_HIPROC 0x7FFFFFFF
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/** Section Header */
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typedef struct {
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Elf32_Word sh_name;
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Elf32_Word sh_type;
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Elf32_Word sh_flags;
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Elf32_Addr sh_addr;
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Elf32_Off sh_offset;
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Elf32_Word sh_size;
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Elf32_Word sh_link;
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Elf32_Word sh_info;
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Elf32_Word sh_addralign;
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Elf32_Word sh_entsize;
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} Elf32_Shdr;
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typedef struct {
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uint32_t id;
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uintptr_t ptr;
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} Elf32_auxv;
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typedef struct {
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Elf32_Word st_name;
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Elf32_Addr st_value;
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Elf32_Word st_size;
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unsigned char st_info;
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unsigned char st_other;
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Elf32_Half st_shndx;
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} Elf32_Sym;
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typedef struct {
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Elf32_Addr r_offset;
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Elf32_Word r_info;
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} Elf32_Rel;
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typedef struct {
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Elf32_Sword d_tag;
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union {
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Elf32_Word d_val;
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Elf32_Addr d_ptr;
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Elf32_Off d_off;
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} d_un;
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} Elf32_Dyn;
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/* sh_type values */
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#define SHT_NONE 0
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#define SHT_PROGBITS 1
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#define SHT_SYMTAB 2
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#define SHT_STRTAB 3
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#define SHT_NOBITS 8
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#define SHT_REL 9
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#define ELF32_R_SYM(i) ((i) >> 8)
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#define ELF32_R_TYPE(i) ((unsigned char)(i))
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#define ELF32_R_INFO(s,t) (((s) << 8) + (unsigned char)(t))
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#define ELF32_ST_BIND(i) ((i) >> 4)
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#define ELF32_ST_TYPE(i) ((i) & 0xf)
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#define ELF32_ST_INFO(b,t) (((b) << 4) + ((t) & 0xf))
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#define STB_LOCAL 0
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#define STB_GLOBAL 1
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#define STB_WEAK 2
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#define STB_NUM 3
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#define STB_LOPROC 13
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#define STB_HIPROC 15
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#define STT_NOTYPE 0
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#define STT_OBJECT 1
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#define STT_FUNC 2
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#define STT_SECTION 3
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#define STT_FILE 4
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#define STT_COMMON 5
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#define STT_TLS 6
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#define STT_NUM 7
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#define STT_LOPROC 13
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#define STT_HIPROC 15
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