Wexos: Imported from avsys wiki

2024-05-01T17:53:06Z

Imported from avsys wiki

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{{Under-construction}}
'''NSO''' is a file format used on the [[Nintendo Switch]] for storing executable code. All Switch game store code as NSO files.

= File Format =
== Header ==
The file starts with a header. It has the following structure.

{| class="wikitable"
! Offset !! Type !! Description
|-
| 0x00 || Char[4] || '''File magic'''. Always ''NSO0'' in ASCII.
|-
| 0x04 || UInt32 || '''Version number''' of the file format.
|-
| 0x08 || Byte[4] || '''Reserved'''.
|-
| 0x0C || UInt32 || '''Flag'''. xxxx xxxx xxxx xxxx xxxx xxxx xx'''AB''' '''CDEF'''.
* '''A''': verify .data hash.
* '''B''': verify .rodata hash.
* '''C''': verify .text hash.
* '''D''': sets whether .data is compressed.
* '''E''': sets whether ..rodata is compressed.
* '''F''': sets whether text is compressed.
|-
| 0x10 || UInt32 || '''.text section offset'''.
|-
| 0x14 || UInt32 || '''.text memory offset'''.
|-
| 0x18 || UInt32 || '''.text decomopressed size''' in bytes.
|-
| 0x1C || UInt32 || '''Module offset'''.
|-
| 0x20 || UInt32 || '''.rodata section offset'''.
|-
| 0x24 || UInt32 || '''.rodata memory offset'''.
|-
| 0x28 || UInt32 || '''.rodata decomopressed size''' in bytes.
|-
| 0x2C || UInt32 || '''Module size''' in bytes.
|-
| 0x30 || UInt32 || '''.data section offset'''.
|-
| 0x34 || UInt32 || '''.data memory offset'''.
|-
| 0x38 || UInt32 || '''.data decomopressed size''' in bytes.
|-
| 0x3C || UInt32 || '''.bss size'''.
|-
| 0x40 || Byte[0x20] || '''Build ID'''. Identical to .note section from an ELF.
|-
| 0x60 || UInt32 || '''.text compressed size''' in bytes.
|-
| 0x64 || UInt32 || '''.rodata compressed size''' in bytes.
|-
| 0x68 || UInt32 || '''.data compressed size''' in bytes.
|-
| 0x6C || Byte[0x1C] || '''Padding'''.
|-
| 0x88 || UInt32 || '''API .rodata region offset'''.
|-
| 0x8C || UInt32 || '''API .rodata region size''' in bytes.
|-
| 0x90 || UInt32 || '''Dynstr .rodata region offset'''.
|-
| 0x94 || UInt32 || '''Dynstr .rodata region size''' in bytes.
|-
| 0x98 || UInt32 || '''Dynsym .rodata region offset'''.
|-
| 0x9C || UInt32 || '''Dynsym .rodata region size''' in bytes.
|-
| 0xA0 || Byte[0x20] || '''.text decompressed data SHA-256 hash'''
|-
| 0xC0 || Byte[0x20] || '''.rodata decompressed data SHA-256 hash'''
|-
| 0xE0 || Byte[0x20] || '''.data decompressed data SHA-256 hash'''
|}

= Tools =
The following tools can handle NSO files:
* (none)

[[Category:Switch File Formats]]

NSO (File Format) - Revision history

Wexos: Imported from avsys wiki