Re: [Qemu-devel] i386-linux-user on ARM host

[Gary Thomas]

On 09/08/2009 03:35 PM, Gary Thomas wrote:
> On 09/08/2009 12:24 PM, Gary Thomas wrote:
> > I've built the latest Qemu, running on ARM (OMAP3530) with
> > i386-linux-user support. I built from .git because I couldn't
> > get the cross compile setup to work at all using 0.11.0-rc2 :-(
> >
> > Anyway, on a simple test it sort of works, but not quite right.
> > I tried running 'ls'. Here's what I get via Qemu:
> >
> > address@hidden:~ qemu-i386 /testing/i386/ls -l /
> > total 24
> > drwxr-xr-x 2 996 996 4096 Nov 12 2007 etc
> > drwxr-xr-x 2 996 996 4096 Nov 12 2007 lib
> > drwxr-xr-x 4 996 996 4096 Apr 11 2003 usr
> >
> > Here's what it should look like:
> > address@hidden:~ ls -l /
> > drwxr-xr-x 2 996 996 4096 Jun 25 12:38 bin
> > drwxr-xr-x 11 root root 3180 Jan 1 2000 dev
> > drwxr-xr-x 7 996 996 4096 Jun 10 17:43 etc
> > drwxrwxr-x 3 996 996 4096 Jun 4 19:56 home
> > -rwxrwxrwx 1 996 996 951 Aug 25 12:19 lcd_video
> > drwxrwxr-x 3 996 996 4096 Jun 10 22:33 lib
> > lrwxrwxrwx 1 996 996 12 Jun 25 12:38 linuxrc -> /bin/busybox
> > drwxr-xr-x 4 996 996 4096 Sep 8 16:02 local
> > drwxr-xr-x 2 996 996 4096 Jun 4 19:56 mnt
> > dr-xr-xr-x 41 root root 0 Jan 1 1970 proc
> > drwx------ 2 996 996 4096 Jun 4 19:56 root
> > drwxrwxr-x 2 996 996 4096 Aug 5 13:27 sbin
> > drwxr-xr-x 12 root root 0 Jan 1 1970 sys
> > -rwxrwxrwx 1 996 996 884 Jul 30 16:45 test_tv
> > -rwxrwxrwx 1 996 996 884 Jun 8 15:05 test_tv~
> > drwxrwxr-x 4 996 996 4096 Sep 8 18:16 testing
> > drwxrwxrwt 2 root root 40 Jan 1 2000 tmp
> > -rwxrwxrwx 1 root root 875 Aug 6 14:10 tv_video
> > -rwxrwxrwx 1 996 996 884 Aug 6 13:30 tv_video~
> > drwxrwxr-x 7 996 996 4096 Sep 8 16:05 usr
> > drwxr-xr-x 5 996 996 4096 Jun 4 19:56 var
> >
> > Any ideas what's going on?
> >
> > n.b. I tested this the other way around (x86 host, arm-linux-user)
> > and it all seemed to work fine.
>
> Belay that - my previous test that worked was 0.11.0-rc2
>
> The version from .git is broken on all hosts :-(
>
> Any ideas how to fix this or how to actually cross build
> using 0.11.0-rc2?

Sorry all, I've now figured out that it _does_ work, just not
like I expected.  It seems that without a -L option to qemu,
the executed code runs in something like a 'chroot' jail.  Is
this the case?  If so, is there any way to let the emulated
program live in the same file system [space] as other applications?

The idea would be to be able to execute some program, e.g. something
available as x86 only, on the ARM target and make the process as
invisible as possible.  Can this be made to work?



--
------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
------------------------------------------------------------