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#ifndef ELF_H
#define ELF_H
#include <assert.h>
#ifdef KERNEL
#include <fs/vfs.h>
#include <mmu.h>
#endif
#include <typedefs.h>
#define EI_NIDENT 16
#define SHN_UNDEF 0
#define SHN_LORESERVE 0xff00
#define SHN_LOPROC 0xff00
#define SHN_HIPROC 0xff1f
#define SHN_ABS 0xfff1
#define SHN_COMMON 0xfff2
#define SHN_HIRESERVE 0xffff
#define ELF32_R_SYM(i) ((i) >> 8)
#define ELF32_R_TYPE(i) ((unsigned char)(i))
#define ELF32_R_INFO(s, t) (((s) << 8) + (unsigned char)(t))
#define ELF32_ST_BIND(i) ((i)>>4)
#define ELF32_ST_TYPE(i) ((i)&0xf)
#define ELF32_ST_INFO(b,t) (((b)<<4)+((t)&0xf))
#define ET_NONE 0 // No file type
#define ET_REL 1 // Relocatable file
#define ET_EXEC 2 // Executable file
#define ET_DYN 3 // Shared object file
#define ET_CORE 4 // Core file
#define ET_LOPROC 0xff00 // Processor-specific
#define ET_HIPROC 0xffff // Processor-specific
#define EM_NONE 0 // No machine
#define EM_M32 1 // AT&T WE 32100
#define EM_SPARC 2 // SPARC
#define EM_386 3 // Intel 80386
#define EM_68K 4 // Motorola 68000
#define EM_88K 5 // Motorola 88000
#define EM_860 7 // Intel 80860
#define EM_MIPS 8 // MIPS RS3000
#define EV_NONE 0 // Invalid version
#define EV_CURRENT 1 // Current version
#define ELF_EXECUTABLE (1 << 0)
#define ELF_WRITABLE (1 << 1)
#define ELF_READABLE (1 << 2)
#define Elf32_Addr u32 // Unsigned program address
#define Elf32_Half u16 // Unsigned medium integer
#define Elf32_Off u32 // Unsigned file offset
#define Elf32_Sword u32 // Signed large integer
#define Elf32_Word u32 // Unsigned large integer
#define STT_NOTYPE 0
#define STT_OBJECT 1
#define STT_FUNC 2
#define STT_SECTION 3
#define STT_FILE 4
#define STT_LOPROC 13
#define STT_HIPROC 15
#define SHF_WRITE 0x1
#define SHF_ALLOC 0x2
#define SHF_EXECINSTR 0x4
#define SHF_MASKPROC 0xf0000000
#define ELFCLASSNONE 0
#define ELFCLASS32 1
#define ELFCLASS64 2
#define STB_LOCAL 0
#define STB_GLOBAL 1
#define STB_WEAK 2
#define STB_LOPROC 13
#define STB_HIPROC 15
#define ELFDATANONE 0
#define ELFDATA2LSB 1
#define ELFDATA2MSB 2
#define R_386_NONE 0
#define R_386_32 1
#define R_386_PC32 2
#define R_386_GOT32 3
#define R_386_PLT32 4
#define R_386_COPY 5
#define R_386_GLOB_DAT 6
#define R_386_JMP_SLOT 7
#define R_386_RELATIVE 8
#define R_386_GOTOFF 9
#define R_386_GOTPC 10
#define ELF_EXEC (1 << 0)
#define ELF_WRITE (1 << 1)
#define ELF_READ (1 << 2)
// ELF header
typedef struct {
unsigned char e_ident[16];
Elf32_Half e_type; // Object file type (ET_*)
Elf32_Half e_machine; // Required architecture (EM_*)
Elf32_Word e_version; // Object file version (EV_*)
Elf32_Addr e_entry; // File entry point
Elf32_Off e_phoff; // Program header table's offset(bytes)
Elf32_Off e_shoff; // Section header table's offset(bytes)
Elf32_Word e_flags;
Elf32_Half e_ehsize; // ELF Header size
Elf32_Half
e_phentsize; // Size of program's header tables(all are the same size)
Elf32_Half e_phnum; // Amount of program headers
Elf32_Half e_shentsize;
Elf32_Half e_shnum;
Elf32_Half e_shstrndx;
} __attribute__((packed)) ELFHeader;
typedef struct {
Elf32_Addr r_offset;
Elf32_Word r_info;
} Elf32_Rel;
typedef struct {
Elf32_Word st_name;
Elf32_Addr st_value;
Elf32_Word st_size;
unsigned char st_info;
unsigned char st_other;
Elf32_Half st_shndx;
} Elf32_Sym;
typedef struct {
unsigned char e_ident[EI_NIDENT];
Elf32_Half e_type;
Elf32_Half e_machine;
Elf32_Word e_version;
Elf32_Addr e_entry;
Elf32_Off e_phoff;
Elf32_Off e_shoff;
Elf32_Word e_flags;
Elf32_Half e_ehsize;
Elf32_Half e_phentsize;
Elf32_Half e_phnum;
Elf32_Half e_shentsize;
Elf32_Half e_shnum;
Elf32_Half e_shstrndx;
} Elf32_Ehdr;
// Section header
typedef struct {
Elf32_Word sh_name;
Elf32_Word sh_type;
Elf32_Word sh_flags;
Elf32_Addr sh_addr;
Elf32_Off sh_offset;
Elf32_Word sh_size;
Elf32_Word sh_link;
Elf32_Word sh_info;
Elf32_Word sh_addralign;
Elf32_Word sh_entsize;
} Elf32_Shdr;
enum ShT_Types {
SHT_NULL = 0, // Null section
SHT_PROGBITS = 1, // Program information
SHT_SYMTAB = 2, // Symbol table
SHT_STRTAB = 3, // String table
SHT_RELA = 4, // Relocation (w/ addend)
SHT_NOBITS = 8, // Not present in file
SHT_REL = 9, // Relocation (no addend)
};
// Program header
typedef struct {
Elf32_Word p_type;
Elf32_Off p_offset;
Elf32_Addr p_vaddr;
Elf32_Addr p_paddr;
Elf32_Word p_filesz;
Elf32_Word p_memsz;
Elf32_Word p_flags;
Elf32_Word p_align;
} __attribute__((packed)) Elf32_Phdr;
void *load_elf_file(const char *f, u32 *ds);
#endif
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