---
title: "segment.h"
summary: "definitions needed to parse the elf program/segment headers"
---

# `elf_segment_type_E` - enum
- **Null** - Unused segment
- **Load** - Segment that should be included into mappings
- **Dynamic** - Segments of this type contain dynamic linking information
- **Interpreter** - This holds a path to an interpreter
- **Note** - These segments hold notes by the compiler / toolchain
- **Program Header Table** - This points to the table that is holding the segment headers
- **TLS** - This holds a Thread Local Storage template

# `elf_segment_T` - struct

| Name             | Type     | Description                                                                                                                                   |
|------------------|----------|-----------------------------------------------------------------------------------------------------------------------------------------------|
| type             | uint32_t | The segments type -> [elf_segment_type_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/segment.h/#elf_segment_type_e---enum) |
| flags            | uint32_t | The segments flags (Read / Write / Execute)                                                                                                   |
| offset           | uint64_t | The segments position in the elf file                                                                                                         |
| address_virtual  | uint64_t | Where the segment should be mapped in the virtual address space                                                                               |
| address_physical | uint64_t | Not used in the `System V` ABI                                                                                                                |
| length_file      | uint64_t | The segments size in the file                                                                                                                 |
| length_memory    | uint64_t | The size of the area that should be mapped for the segment                                                                                    |
| align            | uint64_t | The segments alignment (has to be a power of 2)                                                                                               |

# `g_elf_segment_type_strings` - global variable
An array of strings matching [elf_segment_type_E](https://nerdcult.net/projects/noxos/docs/codebase/drivers/elf/segment.h/#elf_segment_type_e---enum).