From: arrao@cdac.in (Raghavendra)
To: kernelnewbies@lists.kernelnewbies.org
Subject: Debug Kernel Modules With KGDB
Date: Mon, 01 Dec 2014 16:47:14 +0530 [thread overview]
Message-ID: <547C4E3A.2060109@cdac.in> (raw)
In-Reply-To: <547C4AC1.3050306@gmail.com>
Hi Zhang,
On Monday 01 December 2014 04:32 PM, Freeman Zhang wrote:
> Hi Raghavendra,
>
> Thanks for your reply, but `sudo` doesn't solve the problem :(
Well then I guess 'sudo' isn't implemented in android. Any way,
ultimately you may wan't to login as root and then try reading the file
in order to get the address.
Regards,
Raghavendra
>
> All the best!
>
> Freeman Zhang
>
> -------- Original Message --------
>> 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 11:17 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
2014-12-01 11:02 ` Freeman Zhang
2014-12-01 11:17 ` Raghavendra [this message]
2014-12-01 11:30 ` Freeman Zhang
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