This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] [PATCH][XEN] __trap_to_gdb should return something diffe

To: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH][XEN] __trap_to_gdb should return something different
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Mon, 25 Sep 2006 14:34:58 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-ppc-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Mon, 25 Sep 2006 06:34:09 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <1651B386-9BF7-46F2-97D0-4ABD228E49FA@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: Acbgp2SvovRipkyaEducTwAX8io7RQ==
Thread-topic: [Xen-devel] [PATCH][XEN] __trap_to_gdb should return something different
User-agent: Microsoft-Entourage/

On 25/9/06 14:27, "Jimi Xenidis" <jimix@xxxxxxxxxxxxxx> wrote:

> Currently there are two failure cases:
>    1) GDB had no transport available for its use (UART or otherwise)
>    2) "unexpected trap", usually another trap occurs while gdb is in
> control
> I suppose we could have (1) -EIO and (2) -EBUSY.
> My logic was that either gdb was available or not and that I needed
> to continue as if gdb was not enabled at all.

How would your behaviour differ if gdbstub actually ran and eventually
returned control to you, versus the trap into the debugger being a simple
no-op? Surely the caller doesn't really care either way?

 -- Keir

Xen-devel mailing list