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[Qemu-devel] forking i386 binaries on arm linux user mode

From: Damion Yates
Subject: [Qemu-devel] forking i386 binaries on arm linux user mode
Date: Wed, 10 Feb 2010 21:38:57 +0000 (GMT)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)

I've grabbed the latest stable qemu and compiled under scratchbox.  I
hit an issue compiling it, with no __builtin__clear_cache() so linked in
a kludge.c containing a call to __clear_cache() with the params passed
as they would be to __builtin__clear_cache().

Firstly does this sound like it should work as a workaround?

It certainly got me to the next level, which is that I can now run loads
of linux binaries on my armlinux system (a Nokia n900). I've tried tower
toppler (http://toppler.sourceforge.net/) which uses SDL (via X11) and
this was surprisingly fast, in fact it almost felt as fast as the native
toppler that somebody crosscompiled already. Most linux utils work when
I copy then and any dependant libs from my x86 laptop to the phone. I'm
lucky (I guess) that /lib/ld-linux.so.3 is the arm version and I'm using
a slightly older .2 for x86 so I can have both files there. I also
enabled arbitrary execution of binaries via binfmt_misc. The 600 Mhz Arm
V8 Cortex (I think it is), feels like it's running at about Pentium 90
speeds, which I'm hoping is enough for what I really want to get going.

I want to run an old, possibly win16 Windows game under wine. I saw that
user mode qemu-i386 was able to run wine in a post in 2004:
 - This was on a PPC however.

When I run wine it SEGVs out and the strace of it shows it dies trying
to do clone(). I also can't run things like xterm which can't do fork().
Is this because by default it's trying to go via the arm "/bin/sh" to
invoke whatever it wants to exec() in to?

Should clone()/fork() work?  Has anyone been able to run wine ./blah.exe
under user-linux mode of qemu on arm or indeed any other non x86 based


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