/proc/kcore is what you need, but it is broken on ia64 (and
has been since the dawn of time for access to region 5) because
it assumes that all kernel virtual addresses are above PAGE+AF8-OFFSET.
This isn't true on ia64, VMALLOC+AF8-START is smaller than PAGE+AF8-OFFSET.

Attached is a patch (applies to 2.4.19 and to 2.5.39) that fixes the
assumption.  After applying you'll be able to use:

        +ACM- gdb vmlinux /proc/kcore

and happily ask gdb to examine addresses in region 5.