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Date: Sun, 22 Jan 2012 22:15:59 +0100
From: Jan Kiszka <jan.kiszka@web.de>
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Subject: Re: [Qemu-devel] Failed to use gdb with qemu 15.1 (with and without
 kvm support)
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To: Francis Moreau <francis.moro@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>, qemu-devel@nongnu.org

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On 2012-01-22 20:58, Francis Moreau wrote:
> On Sun, Jan 22, 2012 at 8:21 PM, Jan Kiszka <jan.kiszka@web.de> wrote:
>> On 2012-01-22 20:16, Max Filippov wrote:
>>>> When stopping the guest with -S before it booted, gdb will interrupt=
 it
>>>> while it is still in 16-bit real mode. Later on, when Linux runs, th=
e
>>>> guest is in 64-bit protected mode. gdb is not prepared for such a
>>>> switch. All you can do:
>>>
>>> Try
>>>
>>> set arch i386:x86-64
>>>
>>> in the GDB prompt.
>>>
>>
>> Won't help if gdb already connected in 16/32-bit before.
>=20
> Why not ? is it a gdb bug ?

More than a bug, a deficit in the x86 target management of gdb. Requires
some work, but gdb people are at least aware of the issue.

Jan


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