Date: Fri, 04 Apr 2014 11:11:06 -0700 From: Sean Bruno <sbruno@ignoranthack.me> To: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org> Subject: Re: qemu-mips illegal instruction Message-ID: <1396635066.1475.25.camel@powernoodle.corp.yahoo.com> In-Reply-To: <1396029630.1466.21.camel@powernoodle.corp.yahoo.com> References: <1395337352.7757.11.camel@powernoodle.corp.yahoo.com> <1395599440.67694.13.camel@powernoodle.corp.yahoo.com> <1396029630.1466.21.camel@powernoodle.corp.yahoo.com>
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[-- Attachment #1 --] On Fri, 2014-03-28 at 11:00 -0700, Sean Bruno wrote: > > This problem seems to be caused by a endian issue in qemu-mips. Ed > > Maste found the culprit and I've applied it here: > > > > https://github.com/seanbruno/qemu/commit/05ee8495804599b52a88eb36b13ea9c06b3207cd > > > > Which is my combined tracking branch for qemu and sson's bsd-user > > branch. > > > > I'm currently tracking an "illegal instruction" on exit issue that seems > > to happen on application exit causing a crash. > > > > sean > > > I've been tracking qemu upstream with sson's patches and massaging > things here and there with the bsd-user mode qemu. > > https://github.com/seanbruno/qemu/tree/bsd-user > > That in combination with sson's kernelmod/userland tool allows me to > "chroot" into a mips environment suitable for building packages. > http://people.freebsd.org/~sson/imgact_binmisc/imgact_binmisc.diff > > Currently, if I explicitly pass a shell into the chroot command, I have > no issues and all is well. e.g. chroot /mipsbuild /bin/sh > > If I do not explicitly pass a shell, I get an illegal instruction core > dump from qemu-mips on exit from any command I run in the chroot: > > chroot /mipsbuild > uname -a > <uname output> > (Illegal Instruction)[coredump] > > This breaks poudriere right now. > > > More or less this is my recipe: > - built a mips32 world for "chroot" purposes: > - use sson's binmisc ELF interceptor thing: > - run binmiscctl: > binmiscctl add mips32 --interpreter "/bin/qemu-mips" --magic "\x7f\x45 > \x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00 > \x08" --mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff > \xff\xff\xff\xfe\xff\xff" --size 20 --set-enabled > > > - chroot /mipsbuild > - uname -a (Illegal Instruction and coredump ON EXIT) > > - chroot /mipsbuild /bin/sh > - uname -a (works everytime) > > > sean I've narrowed this down with some help from #bsdmips: env SHELL=/bin/sh chroot /mipsbuild --> no issues running commands env SHELL=/bin/csh chroot /mipsbuild env SHELL=/bin/tcsh chroot /mipsbuild --> both of these cause illegal instructions in qemu-mips Juregen came up with a patch that makes the amd64 version of qemu-mips work, so there's no need to xbuild the i386 version now, so thanks for that! sean ref https://github.com/seanbruno/qemu/tree/bsd-user [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJTPvW5AAoJEBkJRdwI6BaHqewIAI2sfsCFvNKBnVo4mCM/y58E /wxrzbjf5lJYSuuwl02garPurXT4SJf9uXEGnTX4ViTZ0sqfPprNYJ4g0KrywHKa wm9B2G0ER7x8dCFVlc6/lcCCtNYYJC6BQf09FVQwkejRLCr16GuFyO8aId9l2aFP QcJLBcAfl7hvKSm9DkNsrpSGSxN9v/TVF0hHrvyl1AelUwvnw2xqkmt7zALH9YIF FbEiDkyrwgueXdhjb0wHqXgQGyljyJFmF2mjgO9SrunnF3/ZGhLHgpufiXNOacCU shKYVGZSzI34E++quOnYlE5kWy4y+NGE++Ah8YiAqX37MXbnj/kxDpKvlYGSR6g= =iPki -----END PGP SIGNATURE-----help
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