On 7/24/05, Jesper Juhl <[email protected]> wrote:
> On 7/24/05, UmaMaheswari Devi <[email protected]> wrote:
> > I am new to kernel hacking and am facing problems in trying to peek at the
> > runtime values of some kernel variables using gdb.
> >
> > I am issuing the gdb command as follows:
> > gdb vmlinux /proc/kcore
> > This displays the message
> > /proc/kcore: Operation not permitted
> > before the (gdb) prompt is displayed.
> > gdb then prints a value of 0 for any valid variable that is requested.
> >
> > vmlinux appears to be OK, as gdb correctly identifies undefined variables.
> > The problem seems to be with /proc/kcore. This file has a permission of 400. I
> > am using the Red Hat distribution.
> >
> > Any help is appreciated.
> >
> If you want to use gdb to debug the kernel you should probably
> investigate UML (User Mode Linux). Take a look at this link :
> http://user-mode-linux.sourceforge.net/debugging.html
>
> Alternatives include kgdb - http://kgdb.sourceforge.net/
> and kdb - http://oss.sgi.com/projects/kdb/
>
> You can also find many documents on Linux Kernel debugging aids and
> techniques via google.
>
Ohh, and do search the LKML archives, kernel debuggers have been
discussed endlessly over the years on the list, so you should be able
to find many threads covering that.
--
Jesper Juhl <[email protected]>
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
| |
 |