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Most data in Switch binaries are standard ELF structures, however some are custom.
For example, the MOD header is essentially a replacement for a PT_DYNAMIC program header.
=== MOD ===
All offsets are signed 32bit values relative to the magic field.
The 32bits at image base + 4 must point to the magic field.
The MOD structure is designed such that it can be placed at image base and point to itself.
The 2 fields preceding the magic field get copied around with the structure, even if it is relocated to somewhere besides the image base.
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x00
| 4
| zero padding
|-
| 0x04
| 4
| offset to magic. Always 8 (so it works when MOD is at image_base + 0).
|-
| 0x08
| 4
| magic "MOD0"
|-
| 0x0C
| 4
| .dynamic offset
|-
| 0x10
| 4
| .bss start offset
|-
| 0x14
| 4
| .bss end offset
|-
| 0x18
| 4
| .eh_frame start offset
|-
| 0x1C
| 4
| .eh_frame end offset
|-
| 0x20
| 4
| offset to runtime-generated module object. typically equal to .bss base.
|}
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