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[Qemu-devel] qemu-ppc can't run static uClibc binaries.
From: |
Rob Landley |
Subject: |
[Qemu-devel] qemu-ppc can't run static uClibc binaries. |
Date: |
Thu, 11 Feb 2010 05:20:07 -0600 |
User-agent: |
KMail/1.11.2 (Linux/2.6.28-17-generic; KDE/4.2.2; x86_64; ; ) |
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.
Rob
--
Latency is more important than throughput. It's that simple. - Linus Torvalds
- [Qemu-devel] qemu-ppc can't run static uClibc binaries.,
Rob Landley <=
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Alexander Graf, 2010/02/11
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/14
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Alexander Graf, 2010/02/14
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/15
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Alexander Graf, 2010/02/15
- Re: [Qemu-devel] qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/15
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Michael S. Tsirkin, 2010/02/15
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/15
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Alexander Graf, 2010/02/16
- [Qemu-devel] Re: qemu-ppc can't run static uClibc binaries., Rob Landley, 2010/02/16