RTL for stackmachines

[Ábrahám Endre]

Hi,
I'm trying to make a gcc backend for a stack machine, is there a way to
disable register specific behaviour required by target.h, target.c? also
all preserved names in the RTL language assume usages of operands (addm3
mulm3 etc) which is not an option in my target, do I have to manually set
up new stack-based behaviour in the def?