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xen-ia64-devel
Re: [Xen-ia64-devel] unaligned access handler deadlock when a userapplic
Hey Anthony,
This was DomU - I am going to get a montecito with VT setup next week
to try VTI
Gareth.
Hi Gareth
Handling big endian mode is an interesting topic.
Frankly, In VTI side, we didn't handle big endian mode, and we knew
this is
an issue.
I would like to look at this issue.
Did you run this application on domU or VTI-domain?
Thanks
Anthony
-----Original Message-----
From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
Gareth
Knight
Sent: 2006?8?25? 7:58
To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-ia64-devel] unaligned access handler deadlock when a
userapplication runs in big endian mode ( psr.be is set )
All,
Repost sans confidentiality notice !
I've got top of tree xen-ia64-unstable.hg running on my Tiger
system. I'm working on getting our (Transitive's) QuickTransit
dynamic binary translator working in a guest machine. QuickTransit
Sparc Solaris -> ia64 linux makes use of the big endian mode to speed
up its translation of Sparc applications.
I've tried adding a "rum psr.be" in all the interrupt vectors near
the top and that certainly improves matters, but it also causes the
unaligned access handler to believe the user app is running in little
endian mode, which is not true. I've put together an example to
demonstrate the issue. The source is attached below. Basically the
example tries to do an unaligned access whilst in big endian mode,
which when running correctly currently produces a SIGBUS ( since the
Linux kernel currently has no big endian unaligned access
handling ). On the Xen kernel it currently deadlocks.
Comments welcome,
Gareth.
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