[GD-General] calling functions generically

[Brett B. <res...@ga...>]

I'm trying to write a generic function calling program such that I can =
take a parameter list and the address of a function and build the call =
dynamically at runtime on Windows, GameCube and PS2. I have an array of =
input and output codes so I know the types and order of parameters to =
use for the call, and what (if any) the return value is. I'm starting =
with Windows first, and using CodeWarrior for all platforms.

So far I got calling functions with parameters working by using inline =
assembly to simply push the paramters to the stack and then do a call. =
The trouble I'm having at the moment is the return values and how to get =
them. I compiled a number test cases and displayed mixed C and assembly =
and can't figure out the pattern of return values.

Sometimes the complier does a "pop ecx" on return and sometimes "mov =
dword ptr [ebp-0x8],eax" or a variant of that. Can someone help me to =
understand how to robustly handle this? I have done lots of assembly =
programming on other platforms, but this is my first look at Intel and =
the 16/32 bit stuff combined with different modes is really confusing =
for me.

Thanks,
Brett