nissutils needs ghidra helpers too

[fenugrec]

see https://www.romraider.com/forum/viewtopic.php?f=65&t=17799

probably one script per cpu ? to define

• [x] mem areas : Done, in 30a85062413101e59a984b9e658b8f5b95cc0a84
• [x] io regs : done, in 94b30b25b3d9fd05e38e24a
• [x] interrupt vectors : done in 68088be1e3edb5419
• [ ] (next level : show a prompt so select default or secondary IVT (e.g. at 0x1000 or 0x20004 etc)

[fenugrec]

IO regs : One thing I'm experimenting with is to use Renesas' own .h file as the authoritative source (instead of parsing a PDF like we did for the IDA .cfg files). [EDIT] That won't work well, because some structs like st_hcan2 are weirdly organized and have lots of padding bytes within the struct, which will overlap with other peripheral regs. This is fine when programming but not when reversing.

Leaving this for the record : the idea was to

1. File->Parse C source. Mess with options in there, make a new parse profile with just the .h file.
2. This brings in definitions for a whole bunch of structs and unions for all peripherals, but they're not mapped yet
3. TODO: script / manually define symbols for each struct at the correct address.

[fenugrec]

I consider this complete, as of 94b30b25b3d9fd05e38e24ad1fc69970eedc2fe6 .