linux-kernel - Re: [RFC] [PATCH] In-kernel gdbstub based on utrace Infrastructure.

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Message-ID: <20091130123257.GB18879@linux.vnet.ibm.com>
Date:	Mon, 30 Nov 2009 18:02:57 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, "Frank Ch. Eigler" <fche@...hat.com>,
	utrace-devel <utrace-devel@...hat.com>,
	Roland McGrath <roland@...hat.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [RFC] [PATCH] In-kernel gdbstub based on utrace Infrastructure.

* Peter Zijlstra <peterz@...radead.org> [2009-11-30 13:09:12]:

> On Mon, 2009-11-30 at 17:33 +0530, Srikar Dronamraju wrote:
> > This patch implements an in-kernel gdb stub.
> > It provides an interface between gdb and Linux Kernel by implementing
> > the remote serial protocol.  This gdbstub uses utrace infrastructure.
> > This patch provides register set access, signal mapping, process event
> > handling, input/output operations.
> > 
> > /proc/<pid>/gdb was chosen as file for gdb to interact with the
> > process through remote serial protocol. 
> > 
> > Hence users would have to use "target remote /proc/<pid>/gdb" command
> > on gdb prompt to start using this infrastructure.
> > 
> > For Breakpointing support, gdbstub needs User space breakpointing
> > layer and uprobes layer which will be posted later.
> 
> How does this compare to kgdb and related efforts?

This is a In-kernel gdbstub to debug user space programs. 
This stub doesnt help in debugging kernel.

Hence I am not sure how to compare kgdb gdbstub with this gdbstub.
Can you please provide more pointers on what you were referring to?

--
Thanks and Regards
Srikar
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