From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1LoLIr-0003kV-89
	for qemu-devel@nongnu.org; Mon, 30 Mar 2009 13:29:41 -0400
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1LoLIl-0003hf-U8
	for qemu-devel@nongnu.org; Mon, 30 Mar 2009 13:29:39 -0400
Received: from [199.232.76.173] (port=50842 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1LoLIl-0003hZ-MC
	for qemu-devel@nongnu.org; Mon, 30 Mar 2009 13:29:35 -0400
Received: from csl.cornell.edu ([128.84.224.10]:4998 helo=vlsi.csl.cornell.edu)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <vince@stanley.csl.cornell.edu>) id 1LoLIl-0005Jn-DH
	for qemu-devel@nongnu.org; Mon, 30 Mar 2009 13:29:35 -0400
Received: from stanley.csl.cornell.edu (stanley.csl.cornell.edu
	[128.84.224.15])
	by vlsi.csl.cornell.edu (8.13.4/8.13.4) with ESMTP id n2UHTT5b075177
	for <qemu-devel@nongnu.org>; Mon, 30 Mar 2009 13:29:35 -0400 (EDT)
Date: Mon, 30 Mar 2009 13:29:29 -0400 (EDT)
From: Vince Weaver <vince@csl.cornell.edu>
Subject: Re: [Qemu-devel] mipsIV support for mips-linux-user
In-Reply-To: <20090330043539.GE12026@hall.aurel32.net>
Message-ID: <20090330131050.L20376@stanley.csl.cornell.edu>
References: <20090329165112.G16354@stanley.csl.cornell.edu>
	<20090330010551.GD12026@hall.aurel32.net>
	<20090329220159.E17939@stanley.csl.cornell.edu>
	<20090330043539.GE12026@hall.aurel32.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
Reply-To: qemu-devel@nongnu.org
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: qemu-devel@nongnu.org

On Mon, 30 Mar 2009, Aurelien Jarno wrote:

> Do you have the end of qemu.log when running your code with -d in_asm,op?

The first cop1x instruction happens relatively deep into the program, so 
the debugging dump is pretty larege.  How far back do you want?

It looks like no matter what cpu option I pick, the HFLAGS is set to 
0x0022 (which is only the usermode and FPU flags).

Because of this the generated assembly in the debug output unconditionally 
generates an illegal instruction exception the first time a cop1x 
instruction is executed (in my case, "msub.d")

I've been digging through the qemu mips code, and I can't seem to find 
where the hflags are set in the usermode case.

The only place that sets the MIPS_HFLAG_COP1X is in exec.h, 
"compute_hflags()" but that doesn't ever seem to be called if 
CONFIG_USER_ONLY

Vince