Date: Wed, 19 Mar 2014 08:33:27 +0100 From: Mike Ma <mikemandarine@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: freebsd-hackers@freebsd.org, Ed Maste <emaste@freebsd.org> Subject: Re: GSoC proposal: kernel debugging support for LLDB Message-ID: <CA%2BcqwfcjjsRawhqcR19kdWH8UYTBzEcjgYXtG92n1_Q7XJ6RNA@mail.gmail.com> In-Reply-To: <532895C2.1010006@freebsd.org> References: <CA%2BcqwfckT4s3iNwaoNR5p57er7Voofo7f2VnAp%2BGpEiFE-0pJg@mail.gmail.com> <532895C2.1010006@freebsd.org>
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Hi Julian, Actually LLDB has GDB remote protocol and serial port support. We'll just need to connect the dots and make it fully on FreeBSD. On Tue, Mar 18, 2014 at 7:51 PM, Julian Elischer <julian@freebsd.org> wrote: > 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). >> >> > -- Cheers, Mike
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