parcelling up struct gdbarch

[Andrew Cagney]

>> Don't forget you need to bump the syscall number as part of that new 
>> interface.
> 
> 
> Well, the example I was considering here was something like SSE
> registers or Altivec registers which may or may not be available - you
> can safely increase the size of the user struct, and you can add
> subrequests like PTRACE_GETFPXREGS (or whatever it's called).


Well, if you're not careful all existing GDB binaries will mysteriously 
barf.

	Andrew