Relocation support for MIPS R4000 for the MSCoffLoader

[voyagerjuno]

So, I want to implement a CoffRelocationHandler for the MSCoffLoader when the processor is a MIPS R4000 but I don't know where to start or how big of a task it will be.

For some context, I'm exploring some old windows programs and a partial compilation, and ghidra could not load the object files: "No COFF relocation handler for machine type 0x166"

Can you direct me to a start point?

[ryanmkurtz]

Take a look at this class as a starting point: https://github.com/NationalSecurityAgency/ghidra/blob/master/Ghidra/Processors/x86/src/main/java/ghidra/app/util/bin/format/coff/relocation/X86_64_CoffRelocationHandler.java

As long as your new class name ends with ...CoffRelocationHandler, Ghidra will automatically pick it up as a relocation handler. You'll need to implement the canRelocation() method such that it only returns true if the fileHeader indicates it's MIPS R4000.

I am not sure if you know how to develop a Ghidra Extension so I will leave things here for now.

[voyagerjuno]

Thanks a lot! This is exactly the start point I was looking for. So, right now I'm implementing it on a appropriate folder, and hopefully I will make it public on -show and tell- in a few months (yes, it will take me some time)