On Wed, Nov 11, 2009 at 11:45:16PM +0100, Eugeniy Meshcheryakov wrote:
> > This name can be set using objcopy's --add-gnu-debuglink, and that
> > is what things like dh_strip do.
> I tried to do this:
>
> objcopy \
>
> --add-gnu-debuglink=/usr/lib/debug/lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko
> \
> /lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko
>
> But it looks like it only adds snd.ko to the .gnu_debuglink section:
>
> # objdump -s -j .gnu_debuglink
> /lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko
> ...
> Contents of section .gnu_debuglink:
> 0000 736e642e 6b6f0000 944978ab snd.ko...Ix.
I think that's expected behaviour, and atleast looks like all
other things that do work (in gdb).
> And then systemtap looks only at file under /lib/modules:
>
> open("/lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko", O_RDONLY) = 3
> open("/usr/lib/../lib/elfutils/libebl_x86_64.so", O_RDONLY) = 3
>
> open("/usr/lib/debug/.build-id/8d/19f404d7db2242e69c87419b8fd32f67fca584.debug",
> O_RDONLY) = -1 ENOENT (No such file or directory)
> open("/lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko", O_RDONLY) = 3
> WARNING: cannot find module snd debuginfo: No DWARF information found
That might be a bug somewhere. It really should try
/usr/lib/debug/lib/modules/2.6.32-rc6/kernel/sound/core/snd.ko
now.
> > As I understand the code, find-debuginfo.c:find_debuginfo_in_path()
> > uses a default with ".debug" if no debuglink is set.
> It looks like it does not try to look under /usr/lib/debug...
I'll take a look at this tomorrow.
Kurt
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