feature request: add support lifting 32-bit x86 binaries to LLVM IR

[mewmew]

Hi tej!

I tried using g2llvm today to lift some binaries and it worked perfectly for the x86-64 binaries.

However, when I tried to lift 32-bit x86 binaries, I got the following stack trace:

Traceback (most recent call last):
  File "/home/u/Desktop/lifters/Ghidra-to-LLVM/g2llvm.py", line 49, in <module>
    module = xmltollvm.lift(xmlfile)
  File "/home/u/Desktop/lifters/Ghidra-to-LLVM/src/xmltollvm.py", line 70, in lift
    populate_func(ir_func, function)
  File "/home/u/Desktop/lifters/Ghidra-to-LLVM/src/xmltollvm.py", line 79, in populate_func
    populate_cfg(function, builders, blocks)
  File "/home/u/Desktop/lifters/Ghidra-to-LLVM/src/xmltollvm.py", line 110, in populate_cfg
    builder.store(stack_top, registers["RSP"])
KeyError: 'RSP'

I'm sure you are aware of this already. Just wanted to create a tracking issue for supporting 32-bit x86 assembly.

If you want to reproduce, I tried lifting add.o from https://github.com/mewmew/lift-samples/tree/master/x86_32/add.

To create add.o, run the following commands:

$ git clone https://github.com/mewmew/lift-samples
$ cd lift-samples/x86_32/add
$ make -B

Cheers,
Robin