Date: Sun, 17 Aug 2008 11:23:31 -0700 From: Sam Leffler <sam@freebsd.org> To: Guillaume Ballet <gballet@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Extending the ddb command set Message-ID: <48A86CA3.3040007@freebsd.org> In-Reply-To: <fd183dc60808171017m7eabcef2xbe1845e54cda4c99@mail.gmail.com> References: <fd183dc60808160203r3d90c26dq4d282d2ef153d2db@mail.gmail.com> <48A70B37.60401@freebsd.org> <fd183dc60808171017m7eabcef2xbe1845e54cda4c99@mail.gmail.com>
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Guillaume Ballet wrote: > On Sat, Aug 16, 2008 at 5:15 PM, Sam Leffler <sam@freebsd.org> wrote: > >> Guillaume Ballet wrote: >> >>> Hello hackers, >>> >>> I am currently working on a small project and would like to add a few >>> commands to the set that is available in ddb. >>> >>> I found that very interesting albeit succinct presentation: >>> http://people.freebsd.org/~jhb/papers/bsdcan/2008/slides.odp<http://people.freebsd.org/%7Ejhb/papers/bsdcan/2008/slides.odp>; >>> >>> where the author hints that I should use DB_COMMAND, which I did. Yet when >>> invoking ddb, the command does not appear in the help list. I have taken a >>> look at the source code and was expecting set_db_cmd_set to appear in my >>> module's section list when calling objdump -h >>> >>> Is DB_COMMAND only working within the kernel itself, and not modules? >>> >>> >>> >> That is correct; you can't add ddb cmds from modules. It should be doable; just hasn't been done yet. >> >> Sam >> >> > > It is indeed doable: Here are the diffs for a first attempt at doing > this. I am not entirely satisfied with it, though, as it does not work > with DB_SHOW_COMMAND and the likes... Also, I have to declare a lot of > ddb-related stuff into kern_linker.c and I don't like it. I am > currently working at improving the whole thing, but in the mean time > if someone wants to give it a try, comments/rants would be greatly > appreciated. > > Last I looked at this I was convinced it could be done using SYSINIT's and the existing mechanisms for adding ddb cmds. I don't think you need to modify the linker or ddb. Not sure if you looked sys/module.h and/or sys/kernel.h? Sam
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