linux-kernel - Re: [Tux3] Tux3 report: A Golden Copy

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Message-ID: <9bd6b5360812310016k7a75bf8fpbb49de8d9799cbdf@mail.gmail.com>
Date:	Wed, 31 Dec 2008 16:16:41 +0800
From:	sniper <s3c24xx@...il.com>
To:	"Daniel Phillips" <phillips@...nq.net>
Cc:	tux3@...3.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [Tux3] Tux3 report: A Golden Copy

On Wed, Dec 31, 2008 at 4:00 PM, Daniel Phillips <phillips@...nq.net> wrote:
> On Tuesday 30 December 2008 23:34, sniper wrote:
>> Great, I have mounted tux3 filesystem under UML with stuffs in this mail,
>> but I still can't debug it with gdb. Anyone gives me suggestion?
>
> You just have to give a "cont" command a bunch of times and you will
Yes, it works now,

Thanks.
> eventually get to a command prompt.  The reason for this is, uml uses
> the segfault interrupt as part of its machine simulation, and there
> is no exsiting way for uml and gdb to communicate in such a way that
> uml can recognize that the interrupt came from its own code and filter
> it.
>
> Jeff Dike is the expert on this, and Daniel Jacobowitz is the expert
> on the gdb side.  Fixing this would be a big effort, getting two complex
> systems to cooperate better, with nontrivial API issues to solve.  But
> UML is such a wonderful kernel development tool that it might be worth
> the effort.
>
> In the mean time, you could just tell gdb to mask off all segfaults,
> but would be kind of problematic for debugging.
>
> Regards,
>
> Daniel
>
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