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#ifndef TB_ELF_H
#define TB_ELF_H
#include <stdint.h>
#define TB_EI_MAG0 0
#define TB_EI_MAG1 1
#define TB_EI_MAG2 2
#define TB_EI_MAG3 3
#define TB_EI_CLASS 4 /* Class of machine. */
#define TB_EI_DATA 5 /* Data format. */
#define TB_EI_VERSION 6 /* ELF format version. */
#define TB_EI_OSABI 7 /* Operating system / ABI identification */
#define TB_EI_ABIVERSION 8 /* ABI version */
#define TB_OLD_EI_BRAND 8 /* Start of architecture identification. */
#define TB_EI_PAD 9 /* Start of padding (per SVR4 ABI). */
#define TB_EI_NIDENT 16 /* Size of e_ident array. */
/* Values for e_type. */
#define TB_ET_NONE 0 /* Unknown type. */
#define TB_ET_REL 1 /* Relocatable. */
#define TB_ET_EXEC 2 /* Executable. */
#define TB_ET_DYN 3 /* Shared object. */
#define TB_ET_CORE 4 /* Core file. */
#define TB_ET_LOOS 0xfe00 /* First operating system specific. */
#define TB_ET_HIOS 0xfeff /* Last operating system-specific. */
#define TB_ET_LOPROC 0xff00 /* First processor-specific. */
#define TB_ET_HIPROC 0xffff /* Last processor-specific. */
/* Values for e_machine. */
#define TB_EM_NONE 0 /* Unknown machine. */
#define TB_EM_X86_64 62 /* Advanced Micro Devices x86-64 */
#define TB_EM_AARCH64 183 /* AArch64 (64-bit ARM) */
/* sh_type */
#define TB_SHT_NULL 0 /* inactive */
#define TB_SHT_PROGBITS 1 /* program defined information */
#define TB_SHT_SYMTAB 2 /* symbol table section */
#define TB_SHT_STRTAB 3 /* string table section */
#define TB_SHT_RELA 4 /* relocation section with addends */
#define TB_SHT_NOBITS 8 /* no space section */
/* Flags for sh_flags. */
#define TB_SHF_WRITE 0x1 /* Section contains writable data. */
#define TB_SHF_ALLOC 0x2 /* Section occupies memory. */
#define TB_SHF_EXECINSTR 0x4 /* Section contains instructions. */
#define TB_SHF_MERGE 0x10 /* Section may be merged. */
#define TB_SHF_STRINGS 0x20 /* Section contains strings. */
#define TB_SHF_INFO_LINK 0x40 /* sh_info holds section index. */
#define TB_SHF_LINK_ORDER 0x80 /* Special ordering requirements. */
#define TB_SHF_OS_NONCONFORMING 0x100 /* OS-specific processing required. */
#define TB_SHF_GROUP 0x200 /* Member of section group. */
#define TB_SHF_TLS 0x400 /* Section contains TLS data. */
#define TB_SHF_MASKOS 0x0ff00000 /* OS-specific semantics. */
#define TB_SHF_MASKPROC 0xf0000000 /* Processor-specific semantics. */
/* Values for p_flags. */
#define TB_PF_X 0x1 /* Executable. */
#define TB_PF_W 0x2 /* Writable. */
#define TB_PF_R 0x4 /* Readable. */
#define TB_PF_MASKOS 0x0ff00000 /* Operating system-specific. */
#define TB_PF_MASKPROC 0xf0000000 /* Processor-specific. */
/* Values for p_type. */
#define TB_PT_NULL 0 /* Unused entry. */
#define TB_PT_LOAD 1 /* Loadable segment. */
#define TB_PT_DYNAMIC 2 /* Dynamic linking information segment. */
#define TB_PT_INTERP 3 /* Pathname of interpreter. */
#define TB_PT_NOTE 4 /* Auxiliary information. */
#define TB_PT_SHLIB 5 /* Reserved (not used). */
#define TB_PT_PHDR 6 /* Location of program header itself. */
#define TB_PT_TLS 7 /* Thread local storage segment */
/* Values for relocation */
typedef enum {
TB_ELF_X86_64_NONE = 0,
TB_ELF_X86_64_64 = 1,
TB_ELF_X86_64_PC32 = 2,
TB_ELF_X86_64_GOT32 = 3,
TB_ELF_X86_64_PLT32 = 4,
TB_ELF_X86_64_GOTPCREL = 9,
} TB_ELF_RelocType;
// ST_TYPE
#define TB_ELF64_STT_NOTYPE 0
#define TB_ELF64_STT_OBJECT 1
#define TB_ELF64_STT_FUNC 2
#define TB_ELF64_STT_SECTION 3
// ST_INFO
#define TB_ELF64_STB_LOCAL 0
#define TB_ELF64_STB_GLOBAL 1
#define TB_ELF64_STB_WEAK 2
/* Macros for accessing the fields of st_info. */
#define TB_ELF64_ST_BIND(info) ((info) >> 4)
#define TB_ELF64_ST_TYPE(info) ((info) & 0xf)
#define TB_ELF64_ST_INFO(b, t) (((b) << 4) | ((t) & 0xF))
#define TB_ELF64_R_SYM(i) ((i) >> 32u)
#define TB_ELF64_R_TYPE(i) ((i)&0xffffffffULL)
#define TB_ELF64_R_INFO(s, t) (((uint64_t)(s) << 32ULL) + ((uint64_t)(t) & 0xffffffffULL))
// http://web.mit.edu/freebsd/head/sys/sys/elf64.h
// https://cirosantilli.com/elf-hello-world#minimal-elf-file
// https://en.wikipedia.org/wiki/Executable_and_Linkable_Format
typedef struct {
uint8_t ident[16];
uint16_t type;
uint16_t machine;
uint32_t version;
uint64_t entry;
uint64_t phoff;
uint64_t shoff;
uint32_t flags;
uint16_t ehsize;
uint16_t phentsize;
uint16_t phnum;
uint16_t shentsize;
uint16_t shnum;
uint16_t shstrndx;
} TB_Elf64_Ehdr;
typedef struct {
uint32_t name;
uint32_t type;
uint64_t flags;
uint64_t addr;
uint64_t offset;
uint64_t size;
uint32_t link;
uint32_t info;
uint64_t addralign;
uint64_t entsize;
} TB_Elf64_Shdr;
// Segment header for ELF64.
typedef struct {
uint32_t type; // Type of segment
uint32_t flags; // Segment flags
uint64_t offset; // File offset where segment is located, in bytes
uint64_t vaddr; // Virtual address of beginning of segment
uint64_t paddr; // Physical addr of beginning of segment (OS-specific)
uint64_t filesz; // Num. of bytes in file image of segment (may be zero)
uint64_t memsz; // Num. of bytes in mem image of segment (may be zero)
uint64_t align; // Segment alignment constraint
} TB_Elf64_Phdr;
typedef struct {
uint32_t name;
uint8_t info;
uint8_t other;
uint16_t shndx;
uint64_t value;
uint64_t size;
} TB_Elf64_Sym;
typedef struct {
uint64_t offset;
uint64_t info;
int64_t addend;
} TB_Elf64_Rela;
typedef struct {
uint64_t offset;
uint64_t info;
} TB_Elf64_Rel;
#endif /* TB_ELF_H */
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