From: arrao@cdac.in (Raghavendra)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Debug Kernel Modules With KGDB
Date: Mon, 01 Dec 2014 15:23:56 +0530 [thread overview]
Message-ID: <547C3AB4.6020506@cdac.in> (raw)
In-Reply-To: <547C3B39.1050900@gmail.com>
On Monday 01 December 2014 03:26 PM, Freeman Zhang wrote:
> Hi list,
>
> I've been trying to setup a debug environment for linux
> kernel(v3.4,Android,ARM) with kgdb. It worked fine untill I tried to use
> it to debug a module. Under the instruction from LDD, I add module debug
> info in gdb with command:
>
> add-symbol-file test-module.ko address
>
> LDD uses `cat /sys/module/test-module/sections/.text` to get the address
> where the module has been loaded. However, I got:
>
> 0x00000000
Try reading the file as a root.
$ sudo cat /sys/module/test-module/sections/.text
>
> When I use `lsmod`, I got:
>
> test-module 15278 0 - Live 0x00000000 (O)
>
> Why nothing but 0x00000000 ??
>
> So I have to do some research in kernel/module.c, and find out that
> struct module -> module_core = 0xbf000000. But when I try these in gdb:
>
> add-symbol-file test-module.ko 0xbf000000
> break one_of_my_function
>
> I got:
>
> Cannot access memory at address 0xbf002350
>
> :(
> Could somebody help?
>
>
> All the best!
> Freeman Zhang
>
>
>
>
>
>
>
> _______________________________________________
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
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next prev parent reply other threads:[~2014-12-01 9:53 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-01 9:56 Debug Kernel Modules With KGDB Freeman Zhang
2014-12-01 9:53 ` Raghavendra [this message]
2014-12-01 11:02 ` Freeman Zhang
2014-12-01 11:17 ` Raghavendra
2014-12-01 11:30 ` Freeman Zhang
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