Difference between revisions of "NRO"
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Revision as of 17:37, 22 February 2020
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):
Start
Offset | Size | Description |
---|---|---|
0x0 | 0x4 | Unused |
0x4 | 0x4 | MOD0 offset |
0x8 | 0x8 | Padding |
Header
Offset | Size | Description |
---|---|---|
0x0 | 0x4 | Magic "NRO0" |
0x4 | 0x4 | Version (always 0) |
0x8 | 4 | Size (total NRO file size) |
0xC | 0x4 | Flags (unused) |
0x10 | 0x8 * 3 | SegmentHeader[3] {.text, .ro, .data} |
0x28 | 0x4 | BssSize |
0x2C | 0x4 | Reserved |
0x30 | 0x20 | ModuleId |
0x50 | 0x04 | DsoHandleOffset (unused) |
0x54 | 0x04 | Reserved (unused) |
0x58 | 0x8 * 3 | SegmentHeader[3] {.apiInfo, .dynstr, .dynsym} |
SegmentHeader
Offset | Size | Description |
---|---|---|
0x0 | 0x4 | MemoryOffset |
0x4 | 0x4 | Size |
ModuleId
Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes.
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. |