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.
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