Date: Mon, 08 Nov 2010 16:34:21 -0800 From: Julian Elischer <julian@freebsd.org> To: FreeBSD Current <current@freebsd.org> Subject: kgdb and .ko files Message-ID: <4CD8970D.6030003@freebsd.org>
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my usual command set for doing .ko debugging issomething like:
%kgdb /sys/amd64/compile/DEBUG/kernel.symbols
(kgdb) target remote pu_serial2:7005
(kgdb) sharedlibrary driver.ko
(kgdb) directory /home/me/branches/blah/obj/
(kgdb) info sharedlibrary
>From To Syms Read Shared Object Library
0xffffffff81222000 0xffffffff8129dac0 Yes
home/me/branches/blah/freebsd8-amd64/output/driver.ko
but recently the last line has started returning:
>From To Syms Read Shared Object Library
Yes
home/me/branches/blah/freebsd8-amd64/output/driver.ko
Now I can guess that the problem might be something to do with readinf
symbols as our
method of generating the .ko changed a while back but when I look at
it I do see:
awk -f /sys/conf/kmod_syms.awk driver.ko.debug export_syms | xargs
-J% objcopy %driver.ko.debug
objcopy --only-keep-debug driver.ko.debug driver.ko.symbols
objcopy --strip-debug --add-gnu-debuglink=driver.ko.symbols
driver.ko.debug driver.ko
so theoretically the plain driver.ko should result in (k)gdb looking
up the symbol file driver.ko.symbols
which should have all the symbol information needed for debugging..
or am I misreading this?
doesn't seem to work but it does seem to improve if I link the .ko
file to the symbols file..
this is in 8.1 rather than -current but I can't test -current.
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