From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth system call argument
Date: Mon, 5 Mar 2007 18:10:44 -0500 [thread overview]
Message-ID: <20070305231044.GB9525@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200703060003.26856.blaisorblade@yahoo.it>
On Tue, Mar 06, 2007 at 12:03:26AM +0100, Blaisorblade wrote:
> > No, RCX corruption is different - that happens when a sysexit is done
> > from a system call where userspace wasn't prepared to save and restore
> > RCX. sigreturn is the best example.
>
> Hmm... we should finally fix that, at some point. Or... now that you explain
> it this way, it could even seem unfixable... is it? Or maybe sysreturn should
> become a syscall where the return must happen through the slow return path
> (iret), if that exists for x86_64.
This is fixed, and has been for a while. The fix was, as you suggest, return
through iret in this case.
> > But, a 32-bit UML making mmap calls through sysenter indeed does not run
> > very well.
>
> Has this been fixed? I've read that Chuck Ebbert had already fixed this in
> your diary, but not sent the patch.
Yup, and I'm going to resurrect that patch.
> I'd open an entry in bugzilla for this sort of things. It also seems that
> Jason Lunz's patch about max_low_pfn is not even in your tree
It is, I just haven't updated the site with it yet.
Jeff
--
Work email - jdike at linux dot intel dot com
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next prev parent reply other threads:[~2007-03-05 23:19 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-01-31 22:45 [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth system call argument Jeff Dike
2007-02-02 17:48 ` Blaisorblade
2007-02-02 20:12 ` Jeff Dike
2007-03-05 23:03 ` Blaisorblade
2007-03-05 23:10 ` Jeff Dike [this message]
2007-03-05 23:26 ` Blaisorblade
2007-03-09 21:50 ` Blaisorblade
2007-03-12 10:42 ` [uml-devel] [PATCH] x86_64 32-bit ptrace mangles sixth systemcall argument Bodo Stroesser
2007-03-12 22:12 ` Blaisorblade
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