gdb symbol problem

Jie Zhang jie.zhang@analog.com
Mon Dec 28 04:22:00 GMT 2009


On 12/28/2009 12:14 PM, Hushan Jia wrote:
> On Mon, Dec 28, 2009 at 10:38 AM, Jie Zhang<jie.zhang@analog.com>  wrote:
>> On 12/27/2009 11:45 AM, Hushan Jia wrote:
>>>
>>> On Sun, Dec 27, 2009 at 11:36 AM, Paul Pluzhnikov
>>> <ppluzhnikov@google.com>    wrote:
>>>>
>>>> On Sat, Dec 26, 2009 at 6:16 PM, Hushan Jia<hushan.jia@gmail.com>    wrote:
>>>>
>>>>> I invoke gdb like this:
>>>>>
>>>>> [hushan@hushan-t linux-2.6.31.3]$ gdb ./vmlinux
>>>>
>>>> Oh, you are not debugging a regular application. You probably should
>>>> have mentioned that in your initial message.
>>>
>>> Sorry for forget the important information.
>>>
>> What's the output of "readelf -S vmlinux"?
>
> Hi, The output is:
>
> # readelf -S vmlinux
> There are 77 section headers, starting at offset 0x3b569cc:
>
> Section Headers:
>    [Nr] Name              Type            Addr     Off    Size   ES Flg Lk Inf Al
>    [ 0]                   NULL            00000000 000000 000000 00      0   0  0
>    [ 1] .text.head        PROGBITS        c1000000 001000 0000a9 00  AX  0   0  4
>    [ 2] .rel.text.head    REL             00000000 3b575d4 000070 08
>   75   1  4
>    [ 3] .text             PROGBITS        c10000c0 0010c0 291284 00  AX  0   0 32

It seems the machine was not executing code of your vmlinux. The code in 
your vmlinux starts from 0xc1000000. But when you connected with GDB, 
the stopped PC was 0xc0467118, which was just ahead of code sections of 
your vmlinux. Is it possbile the linux kernel running in your qemu was 
not the one you told GDB?


Jie



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