Date: Wed, 3 Jan 2001 12:11:15 +1030 From: Greg Lehey <grog@lemis.com> To: Doug White <dwhite@resnet.uoregon.edu> Cc: Zhiui Zhang <zzhang@cs.binghamton.edu>, freebsd-hackers@FreeBSD.ORG Subject: Re: kernel debugging suggestion needed Message-ID: <20010103121115.D15003@wantadilla.lemis.com> In-Reply-To: <Pine.BSF.4.21.0101021402410.38463-100000@resnet.uoregon.edu>; from dwhite@resnet.uoregon.edu on Tue, Jan 02, 2001 at 02:03:16PM -0800 References: <Pine.SOL.4.21.0101021251070.3528-100000@opal> <Pine.BSF.4.21.0101021402410.38463-100000@resnet.uoregon.edu>
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On Tuesday, 2 January 2001 at 14:03:16 -0800, Doug White wrote:
> On Tue, 2 Jan 2001, Zhiui Zhang wrote:
>
>>
>> I have written a KLD and am debugging it. The program often hangs after
>> runs for a while (I guess it enters into some dead loop). Is there a way
>> to attach to the process and somehow find out which code it is executing
>> (with remote debugging or ddb)?
>
> kld debugging is a bit tricky. Take a look at the debugging macros and
> bits that Greg Lehey put together for vinum for a starting point. You have
> to calculate the appropriate offset to get to the KLD code in gdb.
Doug Rabson has described an alternative to me, but I never got it to
work. My hack walks down the list of klds looking for a name starting
with 'v'; you can change this to something which identifies your kld,
and you'll need to change the name of the kld itself, of course. I
also have a number of other macros in files in
/usr/src/sys/modules/vinum.
Here's the macro:
define asf
set $file = linker_files.tqh_first
set $found = 0
while ($found == 0)
if (*$file->filename == 'v')
set $found = 1
else
set $file = $file->link.tqe_next
end
end
shell /usr/bin/objdump --section-headers sys/modules/vinum/vinum.ko | grep ' .text' | awk '{print "add-symbol-file sys/modules/vinum/vinum.ko \$file->address+0x" $4}' > .asf
source .asf
end
Greg
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