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surprised the page didn't already mention that compression is LZ4
NSO is the main executable format.
NSO is the main executable format.
It starts with the "NSO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers):
It starts with the "NSO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers). If the segments are compressed, they are compressed using LZ4.
= NSO Header =
= NSO Header =
|-
|-
| 0x60
| 0x60
| 0x4 * 3
| 0x4
| CompressedSize[3]
| .text compressed size
|-
| 0x64
| 0x4
| .rodata compressed size
|-
| 0x68
| 0x4
| .data compressed size
|-
|-
| 0x6C
| 0x6C