Date: Thu, 21 Apr 2011 22:16:11 -0400 From: Alexander Kabaev <kabaev@gmail.com> To: Chuck Tuffli <ctuffli@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: no KLD symbols in dtrace? Message-ID: <20110421221611.7f52ca98@kan.dnsalias.net> In-Reply-To: <BANLkTi=iDhVTsdZLrFy6JohSRBexAhWyJA@mail.gmail.com> References: <BANLkTi=iDhVTsdZLrFy6JohSRBexAhWyJA@mail.gmail.com>
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On Thu, 21 Apr 2011 18:37:24 -0700
Chuck Tuffli <ctuffli@gmail.com> wrote:
> (Note I'm new to DTrace, so this may be ignorance on my part)
>
> I have re-built a stock 8.2 kernel and enabled dtrace as per the
> handbook (including WITH_CTF=1) and have built a kld also using
> WITH_CTF=1. When I run the following
>
> dtrace -n"bus_release_resource:entry { stack(); }"
>
> the output looks like
> ...
> 0 33759 bus_release_resource:entry
> 0xffffffff813db04e
> 0xffffffff813db091
> kernel`device_detach+0x84
> kernel`driver_module_handler+0x37c
> kernel`module_unload+0x49
> kernel`linker_file_unload+0x178
> kernel`kern_kldunload+0x117
> kernel`syscallenter+0x23d
> kernel`syscall+0x4b
> kernel`0xffffffff808c5572
>
> where the 0xffffffff813dbXXX addresses correspond to my kld. But I was
> expecting to see symbolic names instead of addresses. Is there
> something else I need to do to add the kld's symbols to the system?
> TIA.
>
There is an omission on our .mk files which prevents CTF info to be
generated for kld modules, regardless of WITH_CTF flag. I had
discovered this at work just recently and have been using the
following patch for the time being:
http://people.freebsd.org/~kan/kmod-dtrace.diff
If you can confirm it works for you too, I'll get it committed.
Thanks,
--
Alexander Kabaev
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