GCC PowerPC register conventions ?

[Bijendra Singh]

I am looking for information on stack contents
in a C/C++ procedure call to/from PowerPC(eg. 603e )
assembly code.
(1) How to organize data in registers when calling
a C/C++ procedure from PowerPC assembly ?
(2) Which register holds return value on return from
a procedure in C/C++ when a C/C++ proc is called
from ppc assembly.
(3) Any references/URLs/docs for programming details.

Thanks
-Bijendra

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