Dealing with multi-instruction masks

[emesare]

Masking of instructions requires us to know that a constant is a pointer to a relocatable section. The issue is that in many RISCy architectures the pattern for loading a pointer will be split across multiple instructions. Identifying this pattern is very error prone if not done on an ISA level.

We should provide a way to register ISA specific handlers that can mask out instructions. This complicates the basic block GUID generation, however these functions wouldn't match regardless because the relocatable instructions weren't masked.

[emesare]

An example of the split pointer arithmetic from TriCore:

00000074  911000f8   movh.a  a15, 0x8001
00000078  d9ff6c38   lea     a15, a15, -0x7b14  {0x800084ec}

[emesare]

Another path forward is utilizing Binary Ninja's MLIL that would be able to identify these patterns and simplify them down to a constant pointer, the issue is that it is not portable. IDA and Ghidra would not be able to replicate that behavior.