From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:33924) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTL8n-000483-7a for qemu-devel@nongnu.org; Tue, 30 Oct 2012 19:22:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TTL8l-0002Ny-SZ for qemu-devel@nongnu.org; Tue, 30 Oct 2012 19:22:37 -0400 Received: from hall.aurel32.net ([88.191.126.93]:45240) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TTL8l-0002Nn-MB for qemu-devel@nongnu.org; Tue, 30 Oct 2012 19:22:35 -0400 Date: Wed, 31 Oct 2012 00:22:33 +0100 From: Aurelien Jarno Message-ID: <20121030232233.GA32197@hall.aurel32.net> References: <508EC28A.5060706@redhat.com> <20121029182958.GB29866@ohm.aurel32.net> <508F8CBB.8090101@redhat.com> <509053A2.6010504@weilnetz.de> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <509053A2.6010504@weilnetz.de> Sender: Aurelien Jarno Subject: Re: [Qemu-devel] 64-on-32 TCG broken List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefan Weil Cc: Paolo Bonzini , qemu-devel On Tue, Oct 30, 2012 at 11:24:34PM +0100, Stefan Weil wrote: > Am 30.10.2012 09:15, schrieb Paolo Bonzini: > >Il 29/10/2012 19:29, Aurelien Jarno ha scritto: > >>On Mon, Oct 29, 2012 at 06:53:14PM +0100, Paolo Bonzini wrote: > >>>>Known-good commit: 8473f377393219390ea6f2d8d450a2b054bb823e > >>>>Known-bad commit: d262cb02861dd33375c08fc798930653b14769e9 > >>>> > >>>>i386-softmmu seems to work. I may try to bisect it tomorrow, but I'd be > >>>>glad if somebody else beats me. It can be reproduced with Wine and > >>>>"x86_64-softmmu/qemu-system-x86_64.exe -L ../pc-bios"; it hangs at iPXE. > >>Oops, sorry about that. Is it win32 or win64? I'll try to fix it asap, > >>but right now I don't have a good network connection enough to either > >>setup a mingw build environment or to connect to a remote machine with > >>such an environment. > > > >It's win32, and the first bad commit is 9c43b68 (tcg: rework liveness > >analysis, 2012-10-09). But it looks like 64-on-32 emulation is more > >generally broken. I now tried x86_64-linux-user compiled for 32-bit, > >and it segfaults on startup. Even the previous commit cannot run > >qemu-x86_64 /bin/ls correctly: > > > > I just tested with latest qemu-system-x86_64 on 32 bit Linux. > > It also hangs during boot (BIOS), so it looks like this > is not a MinGW only problem. > > Your test with x86_64-linux-user indicates that, too. > > I also get the problem with TCI. Therefore I expect that any > 32 bit TCG target will show it. > The problem is related to the recent cases for add2/sub2/mulu2 addition which do not play well with the optimizations. I am still trying to understand why. -- Aurelien Jarno GPG: 1024D/F1BCDB73 aurelien@aurel32.net http://www.aurel32.net