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From: Blue Swirl <blauwirbel@gmail.com>
Date: Sat, 12 Feb 2011 00:05:31 +0200
Message-ID: <AANLkTikKDNRGiBU+7RonvaQ09qv9_p=GFdGvP30be3Zf@mail.gmail.com>
Subject: Re: [Qemu-devel] qemu user x86 working?
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To: Andi Kleen <ak@linux.intel.com>
Cc: qemu-devel@nongnu.org

On Fri, Feb 11, 2011 at 9:49 PM, Andi Kleen <ak@linux.intel.com> wrote:
> Hi,
>
> Is the linux-user qemu for x86-64/i386 supposed to work?
>
> For example running it with a simple hello world on FC14 in gdb:
>
> /home/ak/tsrc/hello: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),=
 dynamically linked (uses shared libs), for GNU/Linux 2.6.32, not stripped
>
> [Thread debugging using libthread_db enabled]
> ERROR: ioctl(SNDCTL_DSP_MAPINBUF): target=3D0x80085013 host=3D0x80105013
> ERROR: ioctl(SNDCTL_DSP_MAPOUTBUF): target=3D0x80085014 host=3D0x80105014
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x000000006021f854 in static_code_gen_buffer ()
> (gdb) disp/3i $pc
> 1: x/3i $pc
> =3D> 0x6021f854 <static_code_gen_buffer+162660>: =C2=A0mov =C2=A0 =C2=A0(=
%rbx),%rbp
> =C2=A0 0x6021f857 <static_code_gen_buffer+162663>: =C2=A0mov =C2=A0 =C2=
=A00x28(%r14),%rbx
> =C2=A0 0x6021f85b <static_code_gen_buffer+162667>:
> =C2=A0 =C2=A0add =C2=A0 =C2=A0$0xffffffffffffff88,%rbx
> (gdb) p $rbx
> $2 =3D 0
>
> I tested a few releases back, 0.13 and also 14-rc0 and they
> all segfault, although they are not all in the same place.
> The qemu-user shipped by Fedora also seems to have the same problem.
>
> Is this a known issue or am I doing something obviously wrong?

I don't have any problems running a statically linked x86_64
helloworld program in an i386 chroot. Dynamically linked programs try
to use wrong libraries, but at least running
/lib64/ld-linux-x86-64.so.2 directly works.