NRO: Difference between revisions
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Based on the NSO page. |
No edit summary |
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| Line 32: | Line 32: | ||
|- | |- | ||
| 0x0 | | 0x0 | ||
| | | 0x4 | ||
| Magic "NRO0" | | Magic "NRO0" | ||
|- | |- | ||
| 0x4 | | 0x4 | ||
| | | 0x4 | ||
| ? | | ? | ||
|- | |- | ||
| 0x8 | | 0x8 | ||
| 4 | | 4 | ||
| Total NRO filesize | | size (Total NRO filesize) | ||
|- | |- | ||
| 0xC | | 0xC | ||
| | | 0x4 | ||
| ? | | ? | ||
|- | |- | ||
| Line 80: | Line 80: | ||
|- | |- | ||
| 0x0 | | 0x0 | ||
| | | 0x4 | ||
| FileOffset | | FileOffset | ||
|- | |- | ||
| 0x4 | | 0x4 | ||
| | | 0x4 | ||
| Size | |||
|} | |||
=Assets= | |||
This is an optional custom assets section for homebrew, this is located at file offset {NroHeader.size}. See also [https://github.com/switchbrew/switch-tools switch-tools] for implementation. | |||
The below offsets are relative to the beginning of the assets section (AssetHeader). | |||
== AssetHeader == | |||
{| class="wikitable" border="1" | |||
|- | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 | |||
| 0x4 | |||
| Magic "ASET" | |||
|- | |||
| 0x4 | |||
| 0x4 | |||
| Format version, currently 0. | |||
|- | |||
| 0x8 | |||
| 0x8 | |||
| AssetSection icon. Used by the Homebrew Launcher. Like official icons, this is a 256x256 JPEG. | |||
|- | |||
| 0x10 | |||
| 0x8 | |||
| AssetSection [[Control.nacp|nacp]]. Used by the Homebrew Launcher. | |||
|- | |||
| 0x18 | |||
| 0x8 | |||
| AssetSection romfs. Can be used by the application. | |||
|- | |||
|} | |||
== AssetSection == | |||
{| class="wikitable" border="1" | |||
|- | |||
! Offset | |||
! Size | |||
! Description | |||
|- | |||
| 0x0 | |||
| 0x4 | |||
| Offset | |||
|- | |||
| 0x4 | |||
| 0x4 | |||
| Size | | Size | ||
|} | |} | ||
Revision as of 22:51, 18 February 2018
NRO is the executable format for non-ExeFS binaries.
It starts with the NRO-start structure then the "NRO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers):
NRO Start
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Unused |
| 0x4 | 0x4 | MOD0 offset |
| 0x8 | 0x8 | Padding |
NRO Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Magic "NRO0" |
| 0x4 | 0x4 | ? |
| 0x8 | 4 | size (Total NRO filesize) |
| 0xC | 0x4 | ? |
| 0x10 | 0x8 * 3 | SegmentHeader[3] |
| 0x28 | 0x4 | bssSize |
| 0x2C | 0x4 | ? |
| 0x30 | 0x20 | Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes. |
| 0x50 | 0x10 | Padding |
| 0x60 | 0x10 | ? |
SegmentHeader
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | FileOffset |
| 0x4 | 0x4 | Size |
Assets
This is an optional custom assets section for homebrew, this is located at file offset {NroHeader.size}. See also switch-tools for implementation.
The below offsets are relative to the beginning of the assets section (AssetHeader).
AssetHeader
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Magic "ASET" |
| 0x4 | 0x4 | Format version, currently 0. |
| 0x8 | 0x8 | AssetSection icon. Used by the Homebrew Launcher. Like official icons, this is a 256x256 JPEG. |
| 0x10 | 0x8 | AssetSection nacp. Used by the Homebrew Launcher. |
| 0x18 | 0x8 | AssetSection romfs. Can be used by the application. |
AssetSection
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Offset |
| 0x4 | 0x4 | Size |