Re: [Valgrind-users] Does using modify_ldt break Valgrind?

[Julian S. <js...@ac...>]

> > Thanks. That worked and it moved forward. Unfortunately we set up the fs
> > segment selector to point at the entry. This doesn't seem to be
> > correctly setup under valgrind:
> >
> > setFS(0x3ef)
>
> What instruction(s) is this routine using to set %fs?
>
> It should work - although I think the x86 glibc uses %gs so that
> is probably more thoroughly tested.

I agree, it should work.  Moves to/from segment registers are supported,
as are the use of %ds, %es, %fs and %gs in segment override prefixes.

J