gdb.info: BSD libkvm Interface

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BSD libkvm Interface

BSD-derived systems (FreeBSD/NetBSD/OpenBSD) have a kernel memory
interface that provides a uniform interface for accessing kernel virtual
memory images, including live systems and crash dumps.  GDB uses this
interface to allow you to debug live kernels and kernel crash dumps on
many native BSD configurations.  This is implemented as a special `kvm'
debugging target.  For debugging a live system, load the currently
running kernel into GDB and connect to the `kvm' target:
     (gdb) target kvm
   For debugging crash dumps, provide the file name of the crash dump
as an argument:
     (gdb) target kvm /var/crash/bsd.0
   Once connected to the `kvm' target, the following commands are
available:
`kvm pcb'
     Set current context from pcb address.
`kvm proc'
     Set current context from proc address.  This command isn't
     available on modern FreeBSD systems.