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Date:      Tue, 18 Mar 2014 11:51:46 -0700
From:      Julian Elischer <julian@freebsd.org>
To:        Mike Ma <mikemandarine@gmail.com>, Ed Maste <emaste@freebsd.org>, freebsd-hackers@freebsd.org
Subject:   Re: GSoC proposal: kernel debugging support for LLDB
Message-ID:  <532895C2.1010006@freebsd.org>
In-Reply-To: <CA%2BcqwfckT4s3iNwaoNR5p57er7Voofo7f2VnAp%2BGpEiFE-0pJg@mail.gmail.com>
References:  <CA%2BcqwfckT4s3iNwaoNR5p57er7Voofo7f2VnAp%2BGpEiFE-0pJg@mail.gmail.com>

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most interesting kernel debug support is for live debugging (with the 
remote stub or similar)
how does this relate to that?

On 3/17/14, 12:35 PM, Mike Ma wrote:
> Hi all,
>
> I've submitted a GSoC proposal here,
> http://www.google-melange.com/gsoc/proposal/public/google/gsoc2014/mikemandarine/5665319561461760.
> I'm copying the proposal here for wider audience.
> Any suggestions or comments are more than appreciated.
>
> Thanks a lot for your time.
>
> Project Description
> I'm planning to add a plugin called FreeBSD-kernel to LLDB, and the
> existing userland ELF core strategies can be inherited. On FreeBSD
> system, kernel virtual memory image can be accessed using libkvm
> interfaces, as to support kernel debugging, libkvm APIs, i.e.
> kvm_read(3)/kvm_write(3), will be mainly used. To fully support kernel
> debugging, module metadata parsing and module automatic loading will
> also be implemented.
>
> There is some existing work related to this project. The first is kgdb
> in FreeBSD code base, it is a kernel debugger based on gdb. Plus,
> there is Mac OS X kernel debugging support in LLDB as well. This
> project will be focused on the platform that LLDB supports, including
> amd64, mips and i386. Once this project is done, remote kernel
> debugging and cross-platform kernel debugging would be the next steps
> of interest.
>
> Deliverables
>     - There are two major milestones:
>     #1 Basic support for opening kernel crash dumps and /dev/mem.
> (mid-term deliverable)
>     #2 Full debugging support by adding module parsing and loading.
> (final deliverable)
>
> Test Plan
>    - Check all functionalities and commands are working properly, and
> compare behavior with kgdb and LLDB.
>    - Benchmark tests on startup, stepping, etc.
>
> Project Schedule
>    - Week 1 - 3: Kernel crash dumps support.
>    - Week 4 - 6: Live debugging against /dev/mem support.
>    - Week 7 - 10: Kernel Module parsing and loading support.
>    - Week 11 - 12: Tests and bug fixing, and documentation work.
>    All features should be done by the suggested Pencils down day (Aug. 11th).
>
>




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