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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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549 lines
34 KiB
HTML
549 lines
34 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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</head>
|
||
<body id="kdb" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="kdb"><a class="anchor" href="#kdb"></a><a class="link" href="#kdb">4.3. KDB</a></h3>
|
||
<div class="paragraph">
|
||
<p>KDB is a way to use KDB directly in your main console, without GDB.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Advantage over KGDB: you can do everything in one serial. This can actually be important if you only have one serial for both shell and .</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Disadvantage: not as much functionality as GDB, especially when you use Python scripts. Notably, TODO confirm you can’t see the the kernel source code and line step as from GDB, since the kernel source is not available on guest (ah, if only debugging information supported full source, or if the kernel had a crazy mechanism to embed it).</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Run QEMU as:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --kdb</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This passes <code>kgdboc=ttyS0</code> to the Linux CLI, therefore using our main console. Then QEMU:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>[0]kdb> go</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And now the <code>kdb></code> prompt is responsive because it is listening to the main console.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>After boot finishes, run the usual:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./count.sh &
|
||
./kgdb.sh</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And you are back in KDB. Now you can count with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>[0]kdb> bp __x64_sys_write
|
||
[0]kdb> go
|
||
[0]kdb> go
|
||
[0]kdb> go
|
||
[0]kdb> go</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And you will break whenever <code>__x64_sys_write</code> is hit.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You can get see further commands with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>[0]kdb> help</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The other KDB commands allow you to step instructions, view memory, registers and some higher level kernel runtime data similar to the superior GDB Python scripts.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="kdb-graphic.html">KDB graphic</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="kdb-arm.html">KDB ARM</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="kgdb-kernel-modules.html">KGDB kernel modules</a> | ↑ Up: <a href="kgdb.html">KGDB</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="kdb-graphic.html">KDB graphic</a> →</p>
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