Re: %gs:0 thread pseudoregister in oskit-mach

[Roland McGrath]

> I tried to acces %gs:4 and this failed with an "illegal
> instruction". I also tried to access 0xc0000000 which got a
> segmentation fault. I don't know if I have to test more.

That's the basics.  Thanks for testing it.  I suppose the ideal test would
be a program that systematically explores the addresses from %ds and from
%gs, including negative offsets, but we can leave that as a pastime for the
paranoid.