relying to self with more info..
On 11/8/10 4:34 PM, Julian Elischer wrote:
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..
it seems changing the first objcopy line to give the full path name of
the symbol file seems to help
this is in 8.1 rather than -current but I can't test -current.
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