From: Jan Kiszka <jan.kiszka@web.de>
To: Andreas Schultz <aschultz@warp10.net>
Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org
Subject: Re: gdbstub: packet reply is too long
Date: Sat, 20 Dec 2008 16:49:08 +0100 [thread overview]
Message-ID: <494D13F4.2040609@web.de> (raw)
In-Reply-To: <1229776952.22890.2.camel@ws-aschultz>
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Andreas Schultz wrote:
> Hi,
>
> I'm trying to debug a 32bit (i386) kernel on a 64bit host under kvm, but
> gdb always refuses it with:
> Remote 'g' packet reply is too long:
> 0000000000000000000000000000000000000000000000002306000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000f0ff0000000000000230020000f00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000007f0300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
> 00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
>
> I tried kvm-79 and kvm-git from today. gdb is v6.8 (ubuntu intrepid)
>
> Any hints?
QEMU and also KVM's x86_64 version are currently broken /wrt debugging
targets < 64 bits. I've posted a fix a while ago, but there were
concerns that gdb should better be enhanced (which is basically true,
but unrealistic to achieve in the near future).
In the meantime, you may want to have a look at my kvm [1] or qemu patch
queue [2]. Note that unless you provide a binary to gdb that is 32 bit
already, you may have to switch the architecture manually ("set arch
i386" or "i8086") before attaching.
Jan
[1] git://git.kiszka.org/kvm-userspace.git gdb-queue
[2] git://git.kiszka.org/qemu.git gdb-queue
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next prev parent reply other threads:[~2008-12-20 15:49 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-20 12:42 gdbstub: packet reply is too long Andreas Schultz
2008-12-20 15:49 ` Jan Kiszka [this message]
2008-12-20 20:35 ` [Qemu-devel] " Paul Brook
2008-12-20 21:00 ` Jan Kiszka
2008-12-20 21:03 ` Paul Brook
2008-12-20 21:22 ` Jan Kiszka
2008-12-20 21:34 ` Paul Brook
2008-12-20 21:55 ` Jan Kiszka
2008-12-20 22:08 ` Paul Brook
2008-12-20 22:34 ` Jan Kiszka
2008-12-20 22:46 ` Paul Brook
2008-12-20 23:44 ` Jan Kiszka
2008-12-26 23:30 ` Daniel Jacobowitz
2008-12-29 14:58 ` Jan Kiszka
2008-12-30 22:43 ` [Qemu-devel] " Daniel Jacobowitz
2009-01-02 12:53 ` Jan Kiszka
2009-01-03 1:53 ` Jamie Lokier
2009-01-04 13:50 ` Jan Kiszka
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