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79 lines
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<title>BSD libkvm Interface - Debugging with GDB</title>
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<a name="BSD-libkvm-Interface"></a>
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Next: <a rel="next" accesskey="n" href="Process-Information.html#Process-Information">Process Information</a>,
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Up: <a rel="up" accesskey="u" href="Native.html#Native">Native</a>
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<h4 class="subsection">21.1.1 BSD libkvm Interface</h4>
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<p><a name="index-libkvm-1439"></a><a name="index-kernel-memory-image-1440"></a><a name="index-kernel-crash-dump-1441"></a>
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BSD-derived systems (FreeBSD/NetBSD/OpenBSD) have a kernel memory
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interface that provides a uniform interface for accessing kernel virtual
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memory images, including live systems and crash dumps. <span class="sc">gdb</span>
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uses this interface to allow you to debug live kernels and kernel crash
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dumps on many native BSD configurations. This is implemented as a
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special <code>kvm</code> debugging target. For debugging a live system, load
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the currently running kernel into <span class="sc">gdb</span> and connect to the
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<code>kvm</code> target:
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<pre class="smallexample"> (gdb) <b>target kvm</b>
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</pre>
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<p>For debugging crash dumps, provide the file name of the crash dump as an
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argument:
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<pre class="smallexample"> (gdb) <b>target kvm /var/crash/bsd.0</b>
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</pre>
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<p>Once connected to the <code>kvm</code> target, the following commands are
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available:
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<a name="index-kvm-1442"></a>
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<dl><dt><code>kvm pcb</code><dd>Set current context from the <dfn>Process Control Block</dfn> (PCB) address.
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<br><dt><code>kvm proc</code><dd>Set current context from proc address. This command isn't available on
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modern FreeBSD systems.
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</dl>
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