From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1M8uqS-0000Ti-Lc
	for qemu-devel@nongnu.org; Tue, 26 May 2009 07:29:24 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1M8uqM-0000TS-EA
	for qemu-devel@nongnu.org; Tue, 26 May 2009 07:29:22 -0400
Received: from [199.232.76.173] (port=49937 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1M8uqL-0000TO-M6
	for qemu-devel@nongnu.org; Tue, 26 May 2009 07:29:18 -0400
Received: from mail2.shareable.org ([80.68.89.115]:41118)
	by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32)
	(Exim 4.60) (envelope-from <jamie@shareable.org>) id 1M8uqL-00089Y-6u
	for qemu-devel@nongnu.org; Tue, 26 May 2009 07:29:17 -0400
Date: Tue, 26 May 2009 12:29:15 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] [PATCH 1/16] ARM Add ARM 920T identifiers
Message-ID: <20090526112915.GA3224@shareable.org>
References: <20090423171503.GC4629@derik>
	<200904301708.01385.paul@codesourcery.com>
	<20090523165033.GC8037@derik>
	<200905241931.19368.paul@codesourcery.com>
	<20090526093944.GB4784@derik>
	<761ea48b0905260242v4290a835rd8b958c7544e667c@mail.gmail.com>
	<20090526095652.GA32352@shareable.org>
	<761ea48b0905260308m5ba590cbl31781a20bd3d001f@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=iso-8859-1
Content-Disposition: inline
Content-Transfer-Encoding: 8bit
In-Reply-To: <761ea48b0905260308m5ba590cbl31781a20bd3d001f@mail.gmail.com>
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Laurent Desnogues <laurent.desnogues@gmail.com>
Cc: Vincent Sanders <vince@kyllikki.org>, qemu-devel@nongnu.org

Laurent Desnogues wrote:
> On Tue, May 26, 2009 at 11:56 AM, Jamie Lokier <jamie@shareable.org> wrote:
> > Laurent Desnogues wrote:
> >> On Tue, May 26, 2009 at 11:39 AM, Vincent Sanders <vince@kyllikki.org> wrote:
> >> > I will post the updated patch to the list shortly. Please be assured
> >> > that every program we have tried (boot loaders, Linux, BSD etc.)
> >> > appears to function as expected, to the point it had not been
> >> > apparient the 920 was a different ISA version to the default emulation.
> >> >
> >> > So while this is indeed a technical issue, in practice it doesnt seem
> >> > to be a major problem.
> >>
> >> It could be a major problem if you start playing with ARM/Thumb
> >> interworking.
> >
> > I'm curious.  How would code built for ARMv4T interworking fail on an
> > ARMv5T emulator?
> 
> It shouldn't.  I was thinking about how most people are misusing their
> toolchain and think that if QEMU runs correctly some code, it should
> run on the target.  In that particular case, that will fail :-)  For instance
> LDM with PC used as procedure return does not behave the same
> in v4T and v5 IIRC.

I agree.  Especially for testing toolchains and architecture-specific
code, it would be quite nice :-)

I gather the x86 target is similarly lax with checking some things
that a real x86 checks.

-- Jamie