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gdb: BSD libkvm Interface

 
 21.1.1 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 the "Process Control Block" (PCB) address.
 
 'kvm proc'
      Set current context from proc address.  This command isn't
      available on modern FreeBSD systems.
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