Hi All, Is there a documnent or a way to know the various procedure calling convention used by gcc over time (i.e by gcc version) for regular compile, fastcall, (eventually static function). For instance I got occurences of some gcc version that do a0 in ax, a1 in dx, a2 in 0(sp), a3 in 4(sp) ... and other occurences that do a0 in cx, a1 in dx, a2 in 0(sp), a3 in 4(sp) ... Any hints appreciated. Cheers, Phi