Add support for multiple VFS drives

tos11 commented 4 years ago

Expand Syscalls to 4 args Add second virtual drive D mounted to path provided on command line Output error message if kernel fails to load

For use with corresponding change in Shrine-v6 and requires PhysFS from: https://github.com/ljward10/physfslt-3.0.2/tree/feature/MultiLite

minexew commented 4 years ago

I have been able to build everything, but I am getting some unexpected crashes at the moment. Investigation ongoing.

minexew commented 4 years ago

There was a funny constellation of bugs in my code:

the declaration MAKE_THUNK1(HostGetApiVersion) caused a stack corruption (because _MAKETHUNK1 pops 1 argument from stack, but HostGetApiVersion has no arguments)
templeos_loader didn't correctly resolve Host API imports, basically only patching the last occurence of each function call in a file
as a result, the first call to HostGetEnv in VKMain.HC was left unpatched and effectively resolved to:
```
    ...
    callq .L1      ; instead of callq thunk_GetHostApiVersion
.L1:    ...
```
thus putting an extra qword on the stack and preventing a crash down the road
as a side effect, the env override for COMPILER never worked

Now everything works. Excellent!

minexew / templeos-loader