EE-GCC and EE-G++ caling conventions

[Luzarius]

I want to call c++ or c functions compiled with e-gcc or e-g++ from my assembly code but i am not sure how the compilers handle passing of arguments and return values.
Do they use the stack or registers $a0-$a3 and $v0-$v1 ?
a simple test program compiled with the -S assembly source option showed that it uses the registers but a few online message boards say GCC compilers use the stack.
Does this differ depending on how many arguments there are?
I'd be grateful for any information on this or a link to an article that covers this. thanks.

[Drakonite]

Does this differ depending on how many arguments there are?

Yep. Specifically the first so many arguments are in registers, then if they are more they go on the stack.

[Luzarius]

Cool thanks. Also i should ask if these compilers follow the convention of not messing with registers $s0-$s7 or at least restoring them before returning to the caller.

[Drakonite]

Thats part of the MIPS ABI so I would assume it does ;)