On Mon, May 05, 2008 at 09:27:10AM -0700, David Christensen wrote: > > > Yes, I'm building a debug kernel. I have the line listed above as > > well > > > as the following: > > > > > > options KDB > > > options DDB > > > options GDB > > > options INVARIANTS > > > options INVARIANT_SUPPORT > > > options WITNESS > > > options WITNESS_SKIPSPIN > > > > Dave: > > > > What symbols can you not access exactly and how are you > > installing/setting up debugging? > > > > I just built a RELENG_7 with DDB and I'm able to access bce symbols > > without a problem. I can examine them and call them. I'm not using > > options GDB however, only KDB/DDB. > > > > I would: > > > > - Make sure you have the right if_bce.ko/if_bce.ko.symbols files > > generated/installed which contains the debug sections of your ko (from > > the objcopy calls during the build - the binary is stripped with a > > section pointer to the if_bce.ko.symbols file for debugging > > information I believe) > > - If you are using GDB, make sure its pointed to the right source base > > so it can retrieve symbol information correctly > > - If you are using GDB, stub it out and just use DDB to verify that > > your build is sane (it works for me!) > > - If all else fails, you can always build bce statically (just to move > > forward etc.) > > - Enable the kernel debugger as described above > - Build the driver in the /usr/src/sys/modules/bce directory with the > command "make". > - Run the command "nm if_bce.ko | grep dump_stat" in the same directory > with the kernel module just built. > > In my case I only see a symbol for bce_dump_status_block, but there is a > second routine called bce_dump_stats_block. In my working build there > are 23 functions that start with "bce_dump" but only 8 are displayed with > the command "nm if_bce.ko | grep bce_dump". Of course, I also get the > symbol not present error when I try to use any of those missing symbols > through a "call" command in the debugger.
Most likely, they are optimized out, gcc likes to inline once-called static functions. Aside from playing with the optimization options, the easiest way seems to use functions somewhere else, e.g., put the addresses into some table. Just guessing.
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