Debug Kernel Modules With KGDB

[Freeman Zhang]

Hi Raghavendra,

Thanks for your reply, but `sudo` doesn't solve the problem :(


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
>>
>>     
>>     
>>
>>
>>
>>
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>> Kernelnewbies at kernelnewbies.org
>> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
> 
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