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. -- 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/
