Re: compiling for mips environment

> 1. Why reserve stack space for arguments that are being passed in
> registers?


Support of vararg functions is the primary utility of the 16-byte
reserved space as was already pointed out. These "home locations", as
they are called in the SYSV ABI, are also convenient when you need to
dump a parameter to a memory location because it's address is
taken. For example:


void main(int argc)
{
    foo(&argc); <--- causes store of $4 into first reserved location
}


The ABI specs at http://www.sco.com/developer/devspecs/ are helpful.


Float arguments can be passed in $f12 and $f14 according to that spec
if they are the first one or two arguments to a non-vararg function.


Matt

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