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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).
= NroHeader =
This is "nn::ro::detail::NroHeader".
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
|-
|-
| 0x0
| 0x0
| 0x10
| [[#RocrtHeader|Rocrt]]
|-
| 0x10
| 0x4
| 0x4
| Unused
| Signature ("NRO0")
|-
|-
| 0x14
| 0x4
| 0x4
| Version
|-
| 0x18
| 0x4
| 0x4
| [[NSO|MOD0]] offset
| Size (total NRO file size)
|-
|-
| 0x8
| 0x1C
| 0x8
| 0x4
| Padding
| Flags
|}
|-
| 0x20
| 0x4
| TextMemoryOffset
|-
| 0x24
| 0x4
| TextSize
|-
| 0x28
| 0x4
| RoMemoryOffset
|-
| 0x2C
| 0x4
| RoSize
|-
|-
| 0x30
| 0x4
| DataMemoryOffset
|-
|-
| 0x0
| 0x34
| 0x4
| 0x4
| Magic "NRO0"
| DataSize
|-
|-
| 0x38
| 0x4
| 0x4
| BssSize
|-
| 0x3C
| 0x4
| 0x4
| NRO Format Version (Always 0)
| Reserved
|-
|-
| 0x8
| 0x40
| 4
| 0x20
| size (Total NRO filesize)
| [[#ModuleId|ModuleId]]
|-
|-
| 0xC
| 0x60
| 0x4
| 0x4
| Flags (Unused)
| DsoHandleOffset
|-
|-
| 0x10
| 0x64
| 0x8 * 3
| 0x4
| SegmentHeader[3] {.text, .ro, .data}
| Reserved
|-
|-
| 0x28
| 0x68
| 0x4
| 0x4
| bssSize
| EmbeddedOffset
|-
|-
| 0x2C
| 0x6C
| 0x4
| 0x4
| Reserved (Unused)
| EmbeddedSize
|-
|-
| 0x30
| 0x70
| 0x20
| 0x4
| Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes.
| DynStrOffset
|-
|-
| 0x50
| 0x74
| 0x08
| 0x4
| Reserved (Unused)
| DynStrSize
|-
|-
| 0x58
| 0x78
| 0x8 * 3
| 0x4
| SegmentHeader[3] {.apiInfo, .dynstr, .dynsym}
| DynSymOffset
|-
|-
| 0x7C
| 0x4
| DynSymSize
|}
|}
== SegmentHeader ==
== RocrtHeader ==
This is "nn::ro::detail::RocrtHeader".
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
|-
|-
| 0x0
| 0x0
| 0x4
| [17.0.0+] 0xC ([1.0.0-16.1.0] 0x8)
| FileOffset
| [[MOD#ModuleHeaderLocation|ModuleHeaderLocation]]
|-
|-
| 0xC
| 0x4
| 0x4
| 0x4
| Reserved
|}
|}
=Assets=
== ModuleId ==
This is "nn::ro::detail::ModuleId".
Value of "build id" from ELF's GNU .note section. Contains variable sized digest, up to 32bytes.
= Homebrew =
== 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.
The below offsets are relative to the beginning of the assets section (AssetHeader).
The below offsets are relative to the beginning of the assets section (AssetHeader).
== AssetHeader ==
=== AssetHeader ===
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
| 0x10
| 0x10
| AssetSection romfs. Can be used by the application.
| AssetSection romfs. Can be used by the application.
|}
|}
== AssetSection ==
=== AssetSection ===
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-