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Re: [Qemu-devel] 64-on-32 TCG broken
From: |
Aurelien Jarno |
Subject: |
Re: [Qemu-devel] 64-on-32 TCG broken |
Date: |
Wed, 31 Oct 2012 00:56:36 +0100 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
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.
>
It ended up to be a merge issue. The newly added special cases
for half-dead operations also need to be changed with the liveness
analysis rework.
The attached patch fixes the issue on a 32-bit linux host. I haven't
tried win32 yet, maybe someone will beat me.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
address@hidden http://www.aurel32.net
0001-tcg-don-t-remove-op-if-output-needs-to-be-synced-to-.patch
Description: Text Data
- [Qemu-devel] x86_64-softmmu broken on Windows (TCG?), Paolo Bonzini, 2012/10/29
- Re: [Qemu-devel] x86_64-softmmu broken on Windows (TCG?), Aurelien Jarno, 2012/10/29
- [Qemu-devel] 64-on-32 TCG broken [was Re: x86_64-softmmu broken on Windows (TCG?)], Paolo Bonzini, 2012/10/30
- Re: [Qemu-devel] 64-on-32 TCG broken, Stefan Weil, 2012/10/30
- Re: [Qemu-devel] 64-on-32 TCG broken, Aurelien Jarno, 2012/10/30
- Re: [Qemu-devel] 64-on-32 TCG broken,
Aurelien Jarno <=
- Re: [Qemu-devel] 64-on-32 TCG broken, Aurelien Jarno, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Paolo Bonzini, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Peter Maydell, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Paolo Bonzini, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Aurelien Jarno, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Stefan Weil, 2012/10/31
- Re: [Qemu-devel] 64-on-32 TCG broken, Aurelien Jarno, 2012/10/31