CRO0

Offset	Size	Description
0x0	0x80	SHA-256 hash-table, verified by CRR
0x80	0x04	Magic "CRO0"
0x84	0x04	Code size
0x88	0x08	Unknown
0x90	0x04	File size
0x94	0x1C	Unknown
0xB0	0x04	Code offset
0xB4	0x04	Code size
0xB8	0x04	unk1 offset
0xBC	0x04	unk1 size
0xC0	0x04	Module Name offset
0xC4	0xBC	Module Name size
0xC8	0x04	unk2 offset
0xCC	0x04	unk2 size
0xD0	0x04	Export Table offset
0xD4	0x04	Export Table num (size = num * 8)
0xD8	0x04	unk3 offset
0xDC	0x04	unk3 num
0xE0	0x04	Export Strings offset
0xE4	0x04	Export Strings size
0xE8	0x04	Export Info offset
0xEC	0x04	Export Info num (size = num * 8)
0xF0	0x04	unk4 offset
0xF4	0x04	unk4 num
0xF8	0x04	unk5 offset
0xFC	0x04	unk5 num (size = num * 12)
0x100	0x04	Import Table 1 offset
0x104	0x04	Import Table 1 num (size = num * 4)
0x108	0x04	Import Table 2 offset
0x10C	0x04	Import Table 2 num (size = num * 4)
0x110	0x04	Import Table 3 offset
0x114	0x04	Import Table 3 num (size = num * 4)
0x118	0x04	Import Strings offset
0x11C	0x04	Import Strings size
0x120	0x04	unk8 offset
0x124	0x04	unk8 num
0x128	0x04	Import Info offset
0x12C	0x04	Import Info num (size = num * 12)
0x130	0x04	unk9 offset
0x134	0x04	unk9 num

CRO with extension .cro is used for "DLLs". CRS with extension .crs can be used for storing "DLL" symbols as well. The end of the file is aligned to a 0x1000-byte boundary with 0xCC bytes. CRO0 files are usually stored under "romfs:/cro/".

The first hash-table entry hashes the 0x100-byte header following the hash-table. The following hash-table entries hash the sections specified in the header.

When the RO module loads the entire CRO into process memory(mapped in the 0x00100000-0x04000000 region), it modifies the mapped CRO data. The magic field is also changed to "FIXD".

Upon loading, the RO module will look for symbol "__aeabi_atexit" or "nnroAeabiAtexit_".