On Thu, Oct 30, 2008 at 8:05 AM, Ian Brown <[EMAIL PROTECTED]> wrote:
> Hello,
> I am developing a kernel module (called myModule);
> I have errors when running it in the kernel log; and I want to know in
> which line of my module exactly did this error occur.
>
> in the kernel log I have:
> ...
> ...
> myModule_ioctl+0x4b1/0x864
> [<ffffffff8025c509>] ret_from_intr+0x0/0xa
> <EOI> [<ffffffff8025f952>] copy_user_generic+0x9e/0x126
> [<ffffffff8833fe78>] :myModule:myModule_ioctl+0x4b1/0x864
> [<ffffffff802406be>] do_ioctl+0x55/0x6b
> [<ffffffff80230101>] vfs_ioctl+0x256/0x26f
> [<ffffffff8029f1a9>] sys_futex+0x103/0x121
> [<ffffffff8024aec5>] sys_ioctl+0x59/0x78
> [<ffffffff8025c00e>] system_call+0x7e/0x83
>
> ...
> where myModule_ioctl is a method in myModule.
>
> Can I know with GDB in which line of this method this happened ?
>
>
> I tried to follow LDD3. I used the ./gdbline myModule
> and got:
> add-symbol-file 0xffffffff88329000 \
> -s .bss 0xffffffff8832eb80 \
> -s .data 0xffffffff8832c7c0 \
> -s .exit.text 0xffffffff8832a8a0 \
> -s .gnu.linkonce.this_module 0xffffffff8832c900 \
> -s .init.text 0xffffffff880c5000 \
> -s .note.gnu.build-id 0xffffffff8832a9dc \
> -s .rodata 0xffffffff8832aa00 \
> -s .rodata.str1.1 0xffffffff8832aae9 \
> -s .smp_locks 0xffffffff8832b4e8 \
> -s .strtab 0xffffffff8832c1a8 \
> -s .symtab 0xffffffff8832b590 \
> -s __param 0xffffffff8832b540
>
> Then I ran:
> gdb myModule.ko
> and
> add-symbol-file 0xffffffff88329000 \
> -s .bss 0xffffffff8832eb80 \
> -s .data 0xffffffff8832c7c0 \
> and it was ok.
>
>
> from the gdb prompt,
> (gdb) print myModule_ioctl
> gives:
> $10 = {int (struct inode *, struct file *, unsigned int,
> long unsigned int)} 0x9c7 <myModule_ioctl>
>
> Now what should I do in order to know which line of code is:
> myModule_ioctl+0x4b1/0x864?
>
> Regards,
> Ian
>
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>
You could also use kgdb - kernel debugger (http://kgdb.linsyssoft.com/)
"print myModule_ioctl" would simply give you the signature of this function,
instead you perhaps want to use "disassemble myModule_ioctl"
Thanks
Preeti
