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SubjectRe: X32 psABI status
On Sun, Feb 13, 2011 at 07:13:57AM -0800, H.J. Lu wrote:
> On Sun, Feb 13, 2011 at 7:07 AM, Florian Weimer <> wrote:
> > * H. J. Lu:
> >
> >>> Actually, I'm wondering if you can do the translation in user space.
> >>> There already are 32-on-64 implementations in existence, without
> >>> kernel changes (recent Hotspot, LuaJIT, and probably some more).
> >>
> >> Please check out the x32 kernel source and provide feedback.
> >
> > I still don't understand why you need a separate syscall table.  You
> > should really be able to run on an unmodified amd64 kernel, in 64 bit
> That is done on purpose. x32 is designed for environments where the
> current ia32 API is sufficient. You can think it as ia32 with register
> extended to 64bit plus 8 more registers. Everything else is still 32bit.

I think it would be great if you could add some text like this plus some
rationale (AIUI, this is geared mainly at new Atoms and other x86_64
embedded platforms) to the document.

(BTW, it is not really convincing to me that such a niche is worth all
the trouble this is going to bring.)

Petr "Pasky" Baudis
Computer science education cannot make an expert programmer any more
than studying brushes and pigment can make an expert painter. --esr
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