NSO is the main executable format.
It starts with a header:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 4 | Magic "NSO0" |
| 0x4 | 4 | |
| 0x8 | 4 | |
| 0xC | 4 | |
| 0x10 | 4 | .text compression start offset? (0x101) |
| 0x14 | 4 | .text offset? (0) |
| 0x18 | 4 | .text size |
| 0x1C | 4 | .text required align? (0x1000) |
| 0x20 | 4 | .rodata compression start offset? |
| 0x24 | 4 | .rodata offset |
| 0x28 | 4 | .rodata size |
| 0x2C | 4 | .rodata required align? (1) |
| 0x30 | 4 | .data compression start offset? |
| 0x34 | 4 | .data offset |
| 0x38 | 4 | .data size |
| 0x3C | 4 | .bss size |
| 0x40 | 0x14 | SHA1? |
| 0x54 | 0xC | Padding |
| 0x60 | 4 | Unknown compression offset? |
| 0xA0 | 0x60 | SHA256 hashes over the decompressed sections using the above byte-sizes: .text, .rodata, and .data. |
| 0x100 | Compressed sections |