Ubuntu
qemu-linaro package

qemu-m68k-static: illegal instruction ebc0 during debootstrap second stage

Bug #1254786 reported by Ken Sharp
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
QEMU
Fix Released
Undecided
Unassigned
qemu-linaro (Ubuntu)
New
Undecided
Unassigned

Bug Description

Host: Ubuntu Precise amd64
Guest: Debian (ports) sid m68k

$ sudo qemu-debootstrap --no-check-gpg --arch=m68k sid m68k http://ftp.debian-ports.org/debian
I: Running command: debootstrap --arch m68k --foreign --no-check-gpg sid m68k http://ftp.debian-ports.org/debian
[...]
I: Running command: chroot m68k /debootstrap/debootstrap --second-stage
qemu: fatal: Illegal instruction: ebc0 @ f67e5662
D0 = 6ffffef5 A0 = f67fbf58 F0 = 0000000000000000 ( 0)
D1 = 0000010a A1 = 00000000 F1 = 0000000000000000 ( 0)
D2 = 0000000f A2 = 00000000 F2 = 0000000000000000 ( 0)
D3 = 00000000 A3 = f67e0000 F3 = 0000000000000000 ( 0)
D4 = 00000000 A4 = 00000000 F4 = 0000000000000000 ( 0)
D5 = 00000000 A5 = f67fc000 F5 = 0000000000000000 ( 0)
D6 = 00000000 A6 = f6fff7cc F6 = 0000000000000000 ( 0)
D7 = 00000000 A7 = f6fff580 F7 = 0000000000000000 ( 0)
PC = f67e5662 SR = 0000 ----- FPRESULT = 0
Aborted (core dumped)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: qemu-user-static 1.0.50-2012.03-0ubuntu2.1
ProcVersionSignature: Ubuntu 3.8.0-33.48~precise1-generic 3.8.13.11
Uname: Linux 3.8.0-33-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Mon Nov 25 16:08:26 2013
Dependencies:

InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: qemu-linaro
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
Ken Sharp (kennybobs) wrote :

Version: 1.6.0+dfsg-2ubuntu4

Still present in Trusty.

tags: added: trusty
Revision history for this message
Andreas Färber (afaerber) wrote :

Ken, is that really a bug in QEMU or is Debian expecting some Motorola 68k CPU rather than the ColdFire MCU QEMU emulates?

Revision history for this message
Andreas Schwab (schwab-linux-m68k) wrote : Re: [Bug 1254786] Re: qemu-m68k-static: illegal instruction ebc0 during debootstrap second stage

ebc0 is a bitfield insn which the coldfire doesn't implement.

Andreas.

--
Andreas Schwab, <email address hidden>
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Revision history for this message
Ken Sharp (kennybobs) wrote :

"Debian currently runs on the 68020, 68030, 68040 and 68060 processors"
http://www.debian.org/ports/m68k/

From 2006:
https://lists.debian.org/debian-devel-announce/2006/01/msg00005.html

So I really don't know. :-/

Revision history for this message
John Paul Adrian Glaubitz (glaubitz) wrote :

Ken,

this is known to currently *not* work. As Andreas has already indirectly explained, qemu does not provide full m68k emulation.

Instead, it supports the reduced m68k instruction set of Motorola's ColdFire CPU only.
If you need a QEMU version with full m68k support, please have a look at Laurent Vivier's github repository [1].

You also shouldn't file bugs which are clearly upstream-related to the Ubuntu bugtracker. Ubuntu doesn't even support m68k but Debian does. Still, we also can't do anything about such bugs in Debian, these belong upstream.

Adrian

> [1] https://github.com/vivier/qemu-m68k

Revision history for this message
John Paul Adrian Glaubitz (glaubitz) wrote :

Alright, I have created a page on the Debian Wiki which explains how to properly set up a chroot environment for sbuild/m68k on Debian [1].

With this set up, I was able to increase compile performance dramatically as compared to native m68k hardware or the Aranym Atari m68k emulator.

Enjoy!

Adrian

> [1] https://wiki.debian.org/M68k/sbuildQEMU

Revision history for this message
Thomas Huth (th-huth) wrote :

Triaging old bug tickets... can you still reproduce this issue with the latest version of QEMU? There should now be support for "normal" 68k CPUs, too...

Changed in qemu:
status: New → Incomplete
Revision history for this message
Laurent Vivier (laurent-vivier) wrote :

0xebc0 is "bfexts" with register and is implemented since:

    ac815f46a3 target-m68k: Implement bitfield ops for registers

Available since qemu v2.9.0

Thomas Huth (th-huth)
Changed in qemu:
status: Incomplete → Fix Released
To post a comment you must log in.
This report contains Public information  
Everyone can see this information.
Subscribing...

Other bug subscribers

Remote bug watches

Bug watches keep track of this bug in other bug trackers.