Difference between revisions of "NRO"
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FrasierCrane (talk | contribs) (Update some missing NRO headers.) |
FrasierCrane (talk | contribs) (Finalized NRO format. (Except the NRO start, can't seem to find where this is touched at all. Hope this helps!)) |
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| Line 49: | Line 49: | ||
| 0x10 | | 0x10 | ||
| 0x8 * 3 | | 0x8 * 3 | ||
| − | | SegmentHeader[3] | + | | SegmentHeader[3] {.text, .ro, .data} |
|- | |- | ||
| 0x28 | | 0x28 | ||
| Line 64: | Line 64: | ||
|- | |- | ||
| 0x50 | | 0x50 | ||
| − | | | + | | 0x08 |
| − | | | + | | Reserved (Unused) |
| + | |- | ||
| + | | 0x58 | ||
| + | | 0x8 * 3 | ||
| + | | SegmentHeader[3] {.apiInfo, .dynstr, .dynsym} | ||
|- | |- | ||
| − | |||
| − | |||
| − | |||
|} | |} | ||
Revision as of 02:35, 10 May 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 | NRO Format Version (Always 0) |
| 0x8 | 4 | size (Total NRO filesize) |
| 0xC | 0x4 | Flags (Unused) |
| 0x10 | 0x8 * 3 | SegmentHeader[3] {.text, .ro, .data} |
| 0x28 | 0x4 | bssSize |
| 0x2C | 0x4 | Reserved (Unused) |
| 0x30 | 0x20 | Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes. |
| 0x50 | 0x08 | Reserved (Unused) |
| 0x58 | 0x8 * 3 | SegmentHeader[3] {.apiInfo, .dynstr, .dynsym} |
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 | 0x10 | AssetSection icon. Used by the Homebrew Launcher. Like official icons, this is a 256x256 JPEG. |
| 0x18 | 0x10 | AssetSection nacp. Used by the Homebrew Launcher. |
| 0x28 | 0x10 | AssetSection romfs. Can be used by the application. |
AssetSection
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Offset |
| 0x8 | 0x8 | Size, 0 indicates this section is empty. |