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433 bytes added ,  23:27, 1 July 2017
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NSO is the main executable format.
 
NSO is the main executable format.
   −
It starts with a header:
+
It starts with the "NSO" header and mainly describes .text, .rodata, and .data segments (like a short-form of ELF program headers):
 +
 
 +
=== SegmentHeader ===
 
{| class="wikitable" border="1"
 
{| class="wikitable" border="1"
 
|-
 
|-
Line 10: Line 12:  
| 0x0
 
| 0x0
 
| 4
 
| 4
| Magic "NSO0"
+
| file offset of data
 
|-
 
|-
 
| 0x4
 
| 0x4
 
| 4
 
| 4
|  
+
| memory offset loaded to
 
|-
 
|-
 
| 0x8
 
| 0x8
 
| 4
 
| 4
|  
+
| size of data copied to memory offset (i.e. size after decompression)
 
|-
 
|-
 
| 0xC
 
| 0xC
 
| 4
 
| 4
|  
+
| alignment used on memory size / size of .bss in the case of .data segment
 +
|}
 +
 
 +
=== .rodata-relative extent ===
 +
{| class="wikitable" border="1"
 
|-
 
|-
| 0x10
+
! Offset
| 4
+
! Size
| .text LZ4-compressed data start offset (0x101)
+
! Description
 
|-
 
|-
| 0x14
+
| 0x0
 
| 4
 
| 4
| .text offset? (0)
+
| offset (relative to .rodata)
 
|-
 
|-
| 0x18
+
| 0x4
 
| 4
 
| 4
| .text size
+
| size of region
 +
|}
 +
 
 +
=== NSO Header ===
 +
{| class="wikitable" border="1"
 
|-
 
|-
| 0x1C
+
! Offset
| 4
+
! Size
| .text required align? (0x1000)
+
! Description
 
|-
 
|-
| 0x20
+
| 0x0
 
| 4
 
| 4
| .rodata LZ4-compressed data start offset
+
| Magic "NSO0"
 
|-
 
|-
| 0x24
+
| 0x4
 
| 4
 
| 4
| .rodata offset
+
|  
 
|-
 
|-
| 0x28
+
| 0x8
 
| 4
 
| 4
| .rodata size
+
|  
 
|-
 
|-
| 0x2C
+
| 0xC
 
| 4
 
| 4
| .rodata required align? (1)
+
|  
 
|-
 
|-
| 0x30
+
| 0x10
| 4
+
| 0x10 * 3
| .data LZ4-compressed data start offset
+
| SegmentHeader for each segment
|-
  −
| 0x34
  −
| 4
  −
| .data offset
  −
|-
  −
| 0x38
  −
| 4
  −
| .data size
  −
|-
  −
| 0x3C
  −
| 4
  −
| .bss size
   
|-
 
|-
 
| 0x40
 
| 0x40
 
| 0x14
 
| 0x14
| SHA1?
+
| Value of "build id" from ELF's GNU .note section
 
|-
 
|-
 
| 0x54
 
| 0x54
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|-
 
|-
 
| 0x60
 
| 0x60
| 4
+
| 0x4 * 3
| .rel.dyn compression offset?
+
| file size of each segment (i.e. LZ4-compressed size)
 +
|-
 +
| 0x6c
 +
| 0x24
 +
| Padding
 +
|-
 +
| 0x90
 +
| 8
 +
| .rodata-relative extents of .dynstr
 +
|-
 +
| 0x98
 +
| 8
 +
| .rodata-relative extents of .dynsym
 
|-
 
|-
 
| 0xA0
 
| 0xA0
| 0x60
+
| 0x20 * 3
 
| SHA256 hashes over the decompressed sections using the above byte-sizes: .text, .rodata, and .data.
 
| SHA256 hashes over the decompressed sections using the above byte-sizes: .text, .rodata, and .data.
 
|-
 
|-

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