how to add debug information into the vmlinux

how to add debug information into the vmlinux

[Xu Yang]

Hello everyone,

I am trying to port kernel 2.6.19 onto my system.so I need the c code
, which can show me where the program is running. I add -g when I
compile it.

after I got the vmlinux( uncompressed) I used arm-none-eabi-objcopy
--change-addresses 0x40000000 to change the start address.

it seems that the debug information is strange. expecially after the
mmu is turned on , it totally disappreared.

anyone knows how to handle this?

thanks in advance.

regards,

yang

Re: how to add debug information into the vmlinux

[Jesper Juhl]

On 17/08/07, Xu Yang <risingsunxy@googlemail.com> wrote:
> Hello everyone,
>
> I am trying to port kernel 2.6.19 onto my system.so I need the c code
> , which can show me where the program is running. I add -g when I
> compile it.
>
You shouldn't need to do that manually, simply go into "make
menuconfig", enter the "Kernel hacking" menu and select the "Kernel
debugging" and "Compile the kernel with debug info" options.
You may also want to enable "Compile the kernel with frame pointers"
and various other options in that menu to get more debug info.


-- 
Jesper Juhl <jesper.juhl@gmail.com>
Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
Plain text mails only, please      http://www.expita.com/nomime.html

Re: how to add debug information into the vmlinux

[Xu Yang]

Hi Jesper,

I tried as what you told me. and the vmlinux does contain debug
information. but the start address of this vmlinux is 0xc0008000. when
I tried to run this vmlinux, the program always exit at 0x80a0. I
checked out that here is the place mmu is turned on.
so I used objcopy --change-addresses 0x40000000 to change the start
address of the vmlinux, and the program goes further.but the debug
information disappeared.

how to handle this? (making the program running and debug information available)

thanks,

regards,

yang

2007/8/17, Jesper Juhl <jesper.juhl@gmail.com>:
> On 17/08/07, Xu Yang <risingsunxy@googlemail.com> wrote:
> > Hello everyone,
> >
> > I am trying to port kernel 2.6.19 onto my system.so I need the c code
> > , which can show me where the program is running. I add -g when I
> > compile it.
> >
> You shouldn't need to do that manually, simply go into "make
> menuconfig", enter the "Kernel hacking" menu and select the "Kernel
> debugging" and "Compile the kernel with debug info" options.
> You may also want to enable "Compile the kernel with frame pointers"
> and various other options in that menu to get more debug info.
>
>
> --
> Jesper Juhl <jesper.juhl@gmail.com>
> Don't top-post  http://www.catb.org/~esr/jargon/html/T/top-post.html
> Plain text mails only, please      http://www.expita.com/nomime.html
>

Re: how to add debug information into the vmlinux

[Jan Engelhardt]

On Aug 18 2007 21:49, Xu Yang wrote:
>
>I tried as what you told me. and the vmlinux does contain debug
>information. but the start address of this vmlinux is 0xc0008000. when
>I tried to run this vmlinux, the program always exit at 0x80a0. I
>checked out that here is the place mmu is turned on.
>so I used objcopy --change-addresses 0x40000000 to change the start
>address of the vmlinux, and the program goes further.but the debug
>information disappeared.

Are you using an UML image... or were you really trying to gdb a real vmlinux?



	Jan
-- 

Re: how to add debug information into the vmlinux

[Xu Yang]

this vmlinux file is running on my software virtual prototype system.
and my software enviorment can only load elf file, so I am using this
real vmlinux file.

regards,

Yang

2007/8/18, Jan Engelhardt <jengelh@computergmbh.de>:
>
> On Aug 18 2007 21:49, Xu Yang wrote:
> >
> >I tried as what you told me. and the vmlinux does contain debug
> >information. but the start address of this vmlinux is 0xc0008000. when
> >I tried to run this vmlinux, the program always exit at 0x80a0. I
> >checked out that here is the place mmu is turned on.
> >so I used objcopy --change-addresses 0x40000000 to change the start
> >address of the vmlinux, and the program goes further.but the debug
> >information disappeared.
>
> Are you using an UML image... or were you really trying to gdb a real vmlinux?
>
>
>
>        Jan
> --
>

Re: how to add debug information into the vmlinux

[Jan Engelhardt]

On Aug 18 2007 22:01, Xu Yang wrote:
>
>this vmlinux file is running on my software virtual prototype system.
>and my software enviorment can only load elf file, so I am using this
>real vmlinux file.

Maybe there is a problem in your virtual prototype system (VM?).


	Jan
--