Re: [Xen-devel] Re: NPTL/TLS "emulation" idea (fwd)

[Ian Pratt <Ian.Pratt@xxxxxxxxxxxx>]

> 
>    4. Provide an alternative libc that does the +ve accesses (which are
>       libc private, afaik) in another segment.  This does not break the
>       ABI for userland programs and -ve accesses aren't that bad when
>       there are no +ve accesses in the same segment.

There'd be very little technical reason not to adopt this as the
default libc. Unless this was likely to happen, we might be
better off using simple dynamic binary rewriting to transform the
standard libc into "+ve offsets use fs". The only down side is
the pain that's involved in stopping the patched versions getting
committed to disk by the pre-linker...

Ian




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