[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] Re: [PATCH] gdbstub: x86: Switch 64/32 bit registers dynami
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] Re: [PATCH] gdbstub: x86: Switch 64/32 bit registers dynamically |
Date: |
Thu, 17 Sep 2009 18:38:02 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
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.
>
> Signed-off-by: Jan Kiszka <address@hidden>
> ---
> Sent to qemu-kvm for inclusion on Avi's request as this workaround is
> still disliked upstream.
Sorry, mistyped the list address.
Jan
--
Siemens AG, Corporate Technology, CT SE 2
Corporate Competence Center Embedded Linux