Some instructions not disassembling in Ghidra.

[Fishybob]

Hi Chris, Thanks for making your M16c Ghidra support available on Github. I am working with some R8c/36 processors (cost reduced M16c) and noticed that a few MUL/MULU instructions are not disassembled in Ghidra.
The problematic instruction encodings I have seen are:

• 79B0FD "MUL.W -3H[FB],R0"
• 7D4BF6FF8F "MULU.W #8FFFH,-AH[FB]"
• 7D4BFCB45F "MULU.W #5FB4H, -4H[FB]"
  (The disassembly is from the Renesas HEW tools.)

...Ah, I see your "TODO" notes in m16c.slaspec for MUL.W/MULU.W destinations so I guess this is a known issue...
Thanks again for making you work available!

[silverchris]

Ya, I haven't figured out the best way to handle them yet. Think I am just going to do it the simplest way, which might happen this weekend.

Also, I am happy this is somewhat useful, I wasn't sure if anyone else would find it so. I am sure there are other bugs hiding, as I have only been using it on one program really, myself

[esaulenka]

Also, I am happy this is somewhat useful, I wasn't sure if anyone else would find it so

Chris, thanks a lot for this project. I am digging into some ancient vehicle brain, and your work is VERY useful for me. Thanks again.

[esaulenka]

@Fishybob, if you are still working with this stuff, try also my fork of this repo. I have improved it a bit.

@silverchris, I'll be glad if you find some time to merge back my changes in your branch.

[Fishybob]

@esaulenka, thanks for making your enhancements available. (I setup the Eclipse environment last month and tried to clean up MULx.W but the sleigh spec was melting my brain... ;-)