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Re: Kernel debugging
- From: Nikos Balkanas <nikos dot balkanas at eyeonix dot com>
- To: Mike Frysinger <vapier at gentoo dot org>
- Cc: gdb at sourceware dot org
- Date: Sat, 21 Dec 2013 07:46:25 +0200
- Subject: Re: Kernel debugging
- Authentication-results: sourceware.org; auth=none
- References: <CAAdsYnZo0OFkUbZuQJ=wwyvHEFDy=m9GCyQhs2JePdFtvtaOOg at mail dot gmail dot com> <201312201441 dot 24149 dot vapier at gentoo dot org>
Ty mike,
I am aware of kdgb, but it doesn't have gdb's abilities. Besides I
know extensibly gdb, and I can never find the Sysreq key on my
keyboard :-(. I will try it next time, but for now I solved my problem
by reading the kernel source code. I have noticed the remote_vis.c in
gdb sources. Does this mean I can use gdb remotely to a virtual host?
How can i do it? Furthermore have gdbstubs incorporated into gdb
sources, or is it another abandoned project (since 2003 :-()?
Nikos
On Fri, Dec 20, 2013 at 9:41 PM, Mike Frysinger <vapier@gentoo.org> wrote:
> On Thursday 19 December 2013 13:51:36 Nikos Balkanas wrote:
>> I am developing a module for the Linux kernel. For that i have setup
>> the exact environment in Virtual Box and have loaded the (guest)
>> kernel with -g and removed the -frame-pointers. I will run gdb from
>> host and try to debug kernel on guest system.
>>
>> What is the best approach for this scenario? GDBserver or gdbstubs?.
>> Gdb server is good only for userspace debugging. Will gdbstubs work?
>> Are they included in the recent gdb sources, or are the ones to use
>> since 2003 from sourceforge? I am also looking for instructions on how
>> to implement them. Any hints?
>
> the kernel has a built in gdb stub. look for "kgdb" in the
> documentation/kconfig.
> -mike