* Zachary Amsden ([email protected]) wrote:
> Chris Wright wrote:
> >* Zachary Amsden ([email protected]) wrote:
> >
> >>Allow creation of an compile time hole at the top of linear address space.
> >>
> >>Extended to allow a dynamic hole in linear address space, 7/2005. This
> >>required some serious hacking to get everything perfect, but the end
> >>result
> >>appears to function quite nicely. Everyone can now share the appreciation
> >>of pseudo-undocumented ELF OS fields, which means core dumps, debuggers
> >>and even broken or obsolete linkers may continue to work.
> >>
> >
> >Thanks. Gerd did something similar (although I believe it's simpler,
> >don't recall the relocation magic) for Xen. Either way, it's useful
> >from Xen perspective.
>
> I believe Xen disables sysenter.
Yes, so vsyscall page has int80 implementation.
> The complications in my patch come
> from the fact that the vsyscall page has to be relocated dynamically,
> requiring, basically run time linking on the page and some tweaks to get
> sysenter to work. If you don't use vsyscall (say, non-TLS glibc), then
> you don't need that complexity. But I think it might be needed now,
> even for Xen.
I believe both Xen and execshield move vsyscall out of fixmap, and then
map into userspace as normal vma.
thanks,
-chris
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