From: Paul Brook <paul@codesourcery.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org
Subject: [Qemu-devel] Re: [PATCH 4/4] gdbstub: x86: Switch 64/32 bit registers dynamically
Date: Mon, 29 Jun 2009 14:01:59 +0100 [thread overview]
Message-ID: <200906291402.00530.paul@codesourcery.com> (raw)
In-Reply-To: <20090627075351.13376.20106.stgit@mchn012c.ww002.siemens.net>
On Saturday 27 June 2009, Jan Kiszka wrote:
> Commit 56aebc891674cd2d07b3f64183415697be200084 changed gdbstub in way
> that debugging 32 or 16-bit guest code is no longer possible with qemu
> for x86_64 guest CPUs. Since that commit, qemu only provides registers
> sets for 64-bit, forcing current and foreseeable gdb to also switch its
> architecture to 64-bit. And this breaks if the inferior is 32 or 16 bit.
>
> No question, this is a gdb issue. But, as it was confirmed in several
> discusssions with gdb people, it is a non-trivial thing to fix. So until
> qemu finds a gdb version attach with a rework x86 support, we have to
> work around it by switching the register layout as the guest switches
> its execution mode between 16/32 and 64 bit.
I still object to this patch. Especially as there's no indication that it's a
harroble hack to workaround broken GDB.
Paul
next prev parent reply other threads:[~2009-06-29 13:02 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 4/4] gdbstub: x86: Switch 64/32 bit registers dynamically Jan Kiszka
2009-06-29 13:01 ` Paul Brook [this message]
2009-06-29 13:42 ` [Qemu-devel] " 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
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 1/4] gdbstub: Add vCont support Jan Kiszka
2009-06-27 7:53 ` [Qemu-devel] [PATCH 2/4] gdbstub: x86: Refactor register access Jan Kiszka
2009-06-27 7:53 ` [Qemu-devel] [PATCH 3/4] gdbstub: x86: Support for setting segment registers Jan Kiszka
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