Hello,

Ref: Skip the "red zone" on AMD64
http://sources.redhat.com/ml/gdb-patches/2003-08/msg00092.html

The attached implements the suggested fix in that thread.  For x86-64, 
it gives the same results as the original change (need more test cases).

Eli, doco ok?

Kevin, for PPC64 and AIX I pulled the numbers from ABI doco.  It isn't 
yet tested.  For PPC64 I've too many other failures for results to be 
meaningful, and for AIX probably won't happen :-(.

The remaining bits (framework and x86-64) I'll commit in a few days.
Andrew