From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1NfYDT-0004lf-08 for qemu-devel@nongnu.org; Thu, 11 Feb 2010 07:32:19 -0500 Received: from [199.232.76.173] (port=56405 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1NfYDR-0004lV-Po for qemu-devel@nongnu.org; Thu, 11 Feb 2010 07:32:17 -0500 Received: from Debian-exim by monty-python.gnu.org with spam-scanned (Exim 4.60) (envelope-from ) id 1NfYDP-0007lQ-T2 for qemu-devel@nongnu.org; Thu, 11 Feb 2010 07:32:17 -0500 Received: from cantor.suse.de ([195.135.220.2]:42980 helo=mx1.suse.de) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1NfYDP-0007l3-DM for qemu-devel@nongnu.org; Thu, 11 Feb 2010 07:32:15 -0500 Message-ID: <4B73F8CC.6010406@suse.de> Date: Thu, 11 Feb 2010 13:32:12 +0100 From: Alexander Graf MIME-Version: 1.0 Subject: Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries. References: <201002110520.07620.rob@landley.net> In-Reply-To: <201002110520.07620.rob@landley.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Rob Landley Cc: qemu-devel@nongnu.org Rob Landley wrote: > Static binaries that run under the Linux kernel don't run under qemu-ppc. For > example, the prebuilt busybox binaries here: > > http://busybox.net/downloads/binaries/1.16.0/busybox-powerpc > > Don't run under qemu-ppc, but runs just fine under qemu-system-ppc with the > image at: > > http://impactlinux.com/fwl/downloads/binaries/system-image-powerpc.tar.bz2 > > The reason is that the "powerpc spec" that qemu was written to is for AIX, not > for Linux, and thus the register layout qemu application emulation provides > for powerpc doesn't match what the kernel is actually doing. > > For dynamically linked executables, the dynamic linker reorganizes the > register contents to match the AIX spec from IBM, but statically linked > binaries get what the kernel provides directly. Thus binaries statically > linked against uClibc won't run under qemu-ppc, but run under qemu-system-ppc > just fine. > > I tracked down this problem in 2007: > > http://landley.net/notes-2007.html#28-03-2007 > > And reported it on the list at the time: > > http://lists.gnu.org/archive/html/qemu-devel/2007-03/msg00713.html > http://lists.gnu.org/archive/html/qemu-devel/2007-03/msg00720.html > http://lists.gnu.org/archive/html/qemu-devel/2007-04/msg00315.html > > However, the then-maintainer of powerpc believed nobody else ever had the > right to touch "her code": > > http://lists.gnu.org/archive/html/qemu-devel/2007-04/msg00198.html > > And I was unable to convince her that insisting reality change to match a spec > which wasn't even for the right platform was not a useful approach. Thus the > binary in the first link still won't run under qemu-ppc three years later, > despite running fine under a real Linux kernel. > Patches are always welcome. The only thing you might want to make sure is that dynamically linked binaries also still continue to work :-). Alex