support for ppc

[Wouter Vermeiren]

Hi,

For a project I am working on I would like to reintroduce support for PPC (32bit) into v8. The end goal is to also support nodejs (https://github.com/ibmruntimes/node/issues/144), but that is the second step.

My high level plan of approach is as follows:

1) Get the simulator compiling (gm ppc.debug)

2) Use the simulator to run tests

3) Add custom routine for missing/non-supported FP instructions

4) Test out on hardware

I am currently on step 1. I have fixed already a bunch of compiler errors and I am now fixing "unreachable code" when running mksnapshot.

I would love to get the community's view on how to best approach. Any advice, different approaches, left-over branches.. anything that can help me is very welcome.

Thanks,

Wouter

ps: I am building on a Debian 10.2 64bit (multiarch), if that would be relevant.