---
title: "header.h"
summary: "definitions needed to parse the ELF Header"
---

# `elf_target_architecture_E` - enum
Field in [header](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_header_t---struct): **identity[4]**

# `elf_endianness_E` - enum
Field in [header](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_header_t---struct): **identity[5]**

# `elf_sysabi_E` - enum
Field in [header](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_header_t---struct): **identity[7]**

# `elf_object_type_E` - enum
Field in [header](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_header_t---struct): **type**

# `elf_instruction_set_E` - enum
Field in [header](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_header_t---struct): **isa**

# `elf_header_T` - struct

| Name                       | Type        | Description                                                                                                                                               |
|----------------------------|-------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------|
| identity                   | uint8_t[16] | Information like the used endian and the SysABI is stored in here                                                                                         |
| type                       | uint16_t    | The type of the elf file -> [elf_object_type_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_object_type_e---enum)         |
| isa                        | uint16_t    | The used instruction set -> [elf_instruction_set_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_instruction_set_e---enum) |
| version                    | uint32_t    | ELF version                                                                                                                                               |
| address_entry_point        | uint64_t    | The start point for program execution                                                                                                                     |
| offset_program_header      | uint64_t    | The position of the program header array in the file                                                                                                      |
| offset_section_header      | uint64_t    | The position of the section header array in the file                                                                                                      |
| flags                      | uint32_t    | Architecture dependent, can be ignored                                                                                                                    |
| len_header                 | uint16_t    | The size of this header                                                                                                                                   |
| len_program_header_entry   | uint16_t    | The size of one program header                                                                                                                            |
| num_program_header_entries | uint16_t    | The amount of program headers                                                                                                                             |
| len_section_header_entry   | uint16_t    | The size of one section header                                                                                                                            |
| num_section_header_entries | uint16_t    | The amount of section headers                                                                                                                             |
| string_section_index       | uint16_t    | The section header index of the `.shstrtab` section                                                                                                       |


# `g_elf_target_architecture_strings` - global variable
An array of strings matching [elf_target_architecture_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_target_architecture_e---enum).

# `g_elf_endianness_strings` - global variable
An array of strings matching [elf_endianess_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_endianess_e---enum).

# `g_elf_sysabi_strings` - global variable
An array of strings matching [elf_sysabi_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_sysabi_e---enum).

# `g_elf_object_type_strings` - global variable
An array of strings matching [elf_object_type_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_object_type_e---enum).

# `g_elf_instruction_set_strings` - global variable
An array of strings matching [elf_instruction_set_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/header.h/#elf_instruction_set_e---enum).