Re: [Xen-devel] Re: X86_emulate to be moved into qemu...

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18 May 2006, at 10:50, Petersson, Mats wrote:

> For the movs (in x86_emaulate.c) the segment override is currently
> detected but ignored for protected mode operation (base is assumed to 
> be
> zero). This is why Minix doesn't work properly [or at all, really] -
> admittedly, I don't think Minix is the most critical operating system 
> in
> the world, but one part of fixing this up is to avoid having to fix
> furhter "weirdness" in various operating systems, right?
Well, the core logic calls out to a macro that then ignores the base. 
The obvious thing to do is have add a new call-out hook in struct 
x86_mem_emulator to read base address of a specified selector. Or we 
could simply pass them in as an array, perhaps as structs allowing us 
to determine other useful info like stack segment address size.
If we do that then we get rid of all real vs. protected mode 
segmentation differences in the core emulator. We always call out or 
read from the array. That gets us support for big real mode too.
If you want to add extensions or flexibility to x86_emulate for this 
stuff, please try to trickle piecemeal patches to me. I prefer that to 
big-bang uber patches. I can also make sure it integrates properly with 
current uses of the emulator.
 -- Keir

> >   -- Keir
> >
> >
> > > > What header files are those? It builds in tools/test/
> > without so many
> > > > header files.
> > > 'hg status' says:
> > I'll fix that.
> Ok, thanks.

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