linux-kernel - Re: A script that used by GDB to load the symbols from Linux kernel modules

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Message-ID: <CANFwon042nY_0hZug=-CE9fuwNrsfC3+RwNWvu45wa81Bfd7Hg@mail.gmail.com>
Date:	Thu, 18 Aug 2011 16:24:35 +0800
From:	Hui Zhu <teawater@...il.com>
To:	linux-kernel@...r.kernel.org, gdb@...rceware.org
Subject: Re: A script that used by GDB to load the symbols from Linux kernel modules

Add a menu for select directory and a check.

Thanks,
Hui

On Wed, Aug 17, 2011 at 13:45, Hui Zhu <teawater@...il.com> wrote:
> Hi,
>
> When use GDB to debug or trace your kernel with KGDB, QEMU debug
> interface or KGTP.  You must get some trouble with LKM symbols.  For
> example:
> (gdb) target remote localhost:12345
> Remote debugging using localhost:12345
> native_safe_halt () at
> /home/teawater/big/kernel/linux-2.6/arch/x86/include/asm/irqflags.h:50
> 50      }
> (gdb) b e100_poll
> Function "e100_poll" not defined.
> Make breakpoint pending on future shared library load? (y or [n])
> This is because GDB didn't get the LKM symbols.  You can do it with
> your hand.  But if you have a lot of LKMs, it will need some time.
>
> Now, GDB support python script.  The attachment is a script to load
> all symbols from Linux kernel modules to GDB.
> For example:
> (gdb) target remote localhost:12345
> Remote debugging using localhost:12345
> native_safe_halt () at
> /home/teawater/big/kernel/linux-2.6/arch/x86/include/asm/irqflags.h:50
> 50      }
> (gdb) so ~/kernel/svn/branches/teawater/getmod.py
> (gdb) b e100_poll
> Breakpoint 1 at 0xc889db40: file
> /home/teawater/big/kernel/linux-2.6/drivers/net/e100.c, line 2165.
>
> This script will include in KGTP(https://code.google.com/p/kgtp/) source.
>
> Thanks,
> Hui
>

View attachment "getmod.py" of type "text/x-python" (3813 bytes)