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NRO is the executable format for non-[[ExeFS]] binaries.
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):
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 =
= Start =
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
| 0x0
| 0x0
| 0x4
| 0x4
| Unused
| Unused. Originally 0x0, with [17.0.0+] this is set to value 0x1.
|-
|-
| 0x4
| 0x4
|-
|-
| 0x8
| 0x8
| 0x8
| 0x4
| [1.0.0-16.1.0] Padding. [17.0.0+] [[NSO|nnSdk version]] offset
|-
| 0xC
| 0x4
| Padding
| Padding
|}
|}
= NRO Header =
= Header =
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
| 0x4
| 0x4
| 0x4
| 0x4
| ?
| Version (always 0)
|-
|-
| 0x8
| 0x8
| 4
| 4
| size (Total NRO filesize)
| Size (total NRO file size)
|-
|-
| 0xC
| 0xC
| 0x4
| 0x4
| ?
| Flags (unused)
|-
|-
| 0x10
| 0x10
| 0x8 * 3
| 0x8 * 3
| SegmentHeader[3]
| [[#SegmentHeader|SegmentHeader]][3] {.text, .ro, .data}
|-
|-
| 0x28
| 0x28
| 0x4
| 0x4
| bssSize
| BssSize
|-
|-
| 0x2C
| 0x2C
| 0x4
| 0x4
| ?
| Reserved
|-
|-
| 0x30
| 0x30
| 0x20
| 0x20
| Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes.
| [[#ModuleId|ModuleId]]
|-
|-
| 0x50
| 0x50
| 0x10
| 0x04
| Padding
| DsoHandleOffset (unused)
|-
| 0x54
| 0x04
| Reserved (unused)
|-
|-
| 0x60
| 0x58
| 0x10
| 0x8 * 3
| ?
| [[#SegmentHeader|SegmentHeader]][3] {.apiInfo, .dynstr, .dynsym}
|}
|}
| 0x0
| 0x0
| 0x4
| 0x4
| FileOffset
| MemoryOffset
|-
|-
| 0x4
| 0x4
|}
|}
=Assets=
== 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 [https://github.com/switchbrew/switch-tools switch-tools] for implementation.
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.
|-
|-
| 0x8
| 0x8
| 0x8
| 0x10
| AssetSection icon. Used by the Homebrew Launcher. Like official icons, this is a 256x256 JPEG.
| AssetSection icon. Used by the Homebrew Launcher. Like official icons, this is a 256x256 JPEG.
|-
|-
| 0x18
| 0x10
| 0x10
| AssetSection [[NACP_Format|NACP]]. Used by the Homebrew Launcher.
| AssetSection [[Control.nacp|nacp]]. Used by the Homebrew Launcher.
|-
|-
| 0x18
| 0x28
| 0x8
| 0x10
| AssetSection romfs. Can be used by the application.
| AssetSection romfs. Can be used by the application.
|}
|}
|-
|-
| 0x0
| 0x0
| 0x4
| 0x8
| Offset
| Offset
|-
|-
| 0x4
| 0x8
| 0x4
| 0x8
| Size
| Size, 0 indicates this section is empty.
|}
|}