From: Jan Kiszka <jan.kiszka@siemens.com>
To: Paul Brook <paul@codesourcery.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Re: [PATCH 4/4] gdbstub: x86: Switch 64/32 bit registers dynamically
Date: Mon, 29 Jun 2009 16:53:45 +0200 [thread overview]
Message-ID: <4A48D579.8000305@siemens.com> (raw)
In-Reply-To: <200906291543.34071.paul@codesourcery.com>
Paul Brook wrote:
>>> You've just deliberately broken the qemu gdbstub. After your patch it is
>>> impossible to debug mixed 32/64-bit code.
>> Please give it a try as it's the other way around: You can't properly
>> debug mixed target code without my patch.
>
> Sure you can, you just need a gdb that doesn't suck. As soon as you encounter
> actual mixed code (rather than just running the wrong qemu) your patch causes
> things to die horribly.
Just to recall the situation (again, please actually try it): if you
have to debug code that switches between 16/32 bit and 64 bit, you
_can't_ debug the 16 or 32 bit part as gdb will stumble and fall over
qemu sending 64-bit register layout for 16/32 bit code. That is a gdb
limitation, but this patch is about dealing with it until it's resolved
in gdb.
Jan
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2009-06-29 14:53 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-27 7:53 [Qemu-devel] [RESEND][PATCH 0/4] Long pending gdbstub patches Jan Kiszka
2009-06-27 7:53 ` [Qemu-devel] [PATCH 1/4] gdbstub: Add vCont support Jan Kiszka
2009-06-27 7:53 ` [Qemu-devel] [PATCH 4/4] gdbstub: x86: Switch 64/32 bit registers dynamically Jan Kiszka
2009-06-29 13:01 ` [Qemu-devel] " Paul Brook
2009-06-29 13:42 ` Jan Kiszka
2009-06-29 14:07 ` Paul Brook
2009-06-29 14:22 ` Jan Kiszka
2009-06-29 14:43 ` Paul Brook
2009-06-29 14:53 ` Jan Kiszka [this message]
2009-06-29 15:16 ` Daniel Jacobowitz
2009-06-29 15:36 ` Jan Kiszka
2009-06-29 22:00 ` Jamie Lokier
2009-06-30 11:54 ` Jan Kiszka
2009-06-30 7:15 ` Gerd Hoffmann
2009-06-30 12:00 ` Jan Kiszka
2009-06-29 14:51 ` Paul Brook
2009-06-27 7:53 ` [Qemu-devel] [PATCH 3/4] gdbstub: x86: Support for setting segment registers Jan Kiszka
2009-06-27 7:53 ` [Qemu-devel] [PATCH 2/4] gdbstub: x86: Refactor register access Jan Kiszka
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