Changing register for passing return value from function call

[Arjan Koers]

Hi,

I am writing library functions for m68k cpu32 (with xgcc from
objsw.com) that can get called from the system software of an embedded
system.

GNU GCC passes all return values in %d0 (and %d1 for double). The
system software returns pointers in %a0. Is there a way to let GCC use
%a0 instead of %d0 when returning pointers?

There's just one function (normally main) that gets called by the
system.
My functions can call three system functions that return pointers
(_malloc, _calloc, _realloc). 
Some compiler directive to use %a0 that can be placed at the function
delaration and at the function calls would be nice.


Thanks,

Arjan Koers.
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