Nintendo Switch Brew

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NSO (view source)

Revision as of 19:52, 2 October 2017

198 bytes removed ,  19:52, 2 October 2017
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Line 3: Line 3:  
It starts with the "NSO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers):
 
It starts with the "NSO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers):
   −
=== SegmentHeader ===
+
= NSO Header =
−
{| class="wikitable" border="1"
  −
|-
  −
! Offset
  −
! Size
  −
! Description
  −
|-
  −
| 0x0
  −
| 4
  −
| file offset of data
  −
|-
  −
| 0x4
  −
| 4
  −
| memory offset loaded to
  −
|-
  −
| 0x8
  −
| 4
  −
| size of data copied to memory offset (i.e. size after decompression)
  −
|-
  −
| 0xC
  −
| 4
  −
| alignment used on memory size / size of .bss in the case of .data segment
  −
|}
  −
 
  −
=== .rodata-relative extent ===
  −
{| class="wikitable" border="1"
  −
|-
  −
! Offset
  −
! Size
  −
! Description
  −
|-
  −
| 0x0
  −
| 4
  −
| offset (relative to .rodata)
  −
|-
  −
| 0x4
  −
| 4
  −
| size of region
  −
|}
  −
 
  −
=== NSO Header ===
   
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
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| 0x10
 
| 0x10
 
| 0x10 * 3
 
| 0x10 * 3
−
| SegmentHeader for each segment
+
| SegmentHeader[3]
 
|-
 
|-
 
| 0x40
 
| 0x40
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| 0x60
 
| 0x60
 
| 0x4 * 3
 
| 0x4 * 3
−
| file size of each segment (i.e. LZ4-compressed size)
+
| CompressedSize[3]
 
|-
 
|-
 
| 0x6c
 
| 0x6c
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For example, the MOD header is essentially a replacement for a PT_DYNAMIC program header.
 
For example, the MOD header is essentially a replacement for a PT_DYNAMIC program header.
   −
=== MOD ===
+
== SegmentHeader ==
 +
{| class="wikitable" border="1"
 +
|-
 +
! Offset
 +
! Size
 +
! Description
 +
|-
 +
| 0x0
 +
| 4
 +
| FileOffset
 +
|-
 +
| 0x4
 +
| 4
 +
| MemoryOffset
 +
|-
 +
| 0x8
 +
| 4
 +
| DecompressedSize
 +
|-
 +
| 0xC
 +
| 4
 +
| UnkOffset/UnkSize/BssSize
 +
|}
 +
 
 +
== .rodata-relative extent ==
 +
{| class="wikitable" border="1"
 +
|-
 +
! Offset
 +
! Size
 +
! Description
 +
|-
 +
| 0x0
 +
| 4
 +
| RegionRoDataOffset
 +
|-
 +
| 0x4
 +
| 4
 +
| RegionSize
 +
|}
 +
 
 +
== MOD ==
 
All offsets are signed 32bit values relative to the magic field.
 
All offsets are signed 32bit values relative to the magic field.
 
The 32bits at image base + 4 must point to the magic field.
 
The 32bits at image base + 4 must point to the magic field.
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| 0x00
 
| 0x00
 
| 4
 
| 4
−
| zero padding
+
| ZeroPadding
 
|-
 
|-
 
| 0x04
 
| 0x04
 
| 4
 
| 4
−
| offset to magic. Always 8 (so it works when MOD is at image_base + 0).
+
| MagicOffset. Always 8 (so it works when MOD is at image_base + 0).
 
|-
 
|-
 
| 0x08
 
| 0x08
 
| 4
 
| 4
−
| magic "MOD0"
+
| Magic "MOD0"
 
|-
 
|-
 
| 0x0C
 
| 0x0C
Retrieved from "https://switchbrew.org/wiki/Special:MobileDiff/2652"