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Ciro Santilli
2025-05-10 07:50:53 +01:00
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<meta name="description" content="The perfect emulation setup to study and develop the &lt;&lt;linux-kernel&gt;&gt; v5.9.2, kernel modules, &lt;&lt;qemu-buildroot-setup,QEMU&gt;&gt;, &lt;&lt;gem5-buildroot-setup,gem5&gt;&gt; and x86_64, ARMv7 and ARMv8 &lt;&lt;userland-assembly,userland&gt;&gt; and &lt;&lt;baremetal-setup,baremetal&gt;&gt; assembly, &lt;&lt;c,ANSI C&gt;&gt;, &lt;&lt;cpp,C++&gt;&gt; and &lt;&lt;posix,POSIX&gt;&gt;. &lt;&lt;gdb&gt;&gt; and &lt;&lt;kgdb&gt;&gt; just work. Powered by &lt;&lt;about-the-qemu-buildroot-setup,Buildroot&gt;&gt; and &lt;&lt;about-the-baremetal-setup,crosstool-NG&gt;&gt;. Highly automated. Thoroughly documented. Automated &lt;&lt;test-this-repo,tests&gt;&gt;. "Tested" in an Ubuntu 20.04 host.">
<meta name="description" content="The perfect emulation setup to study and develop the &lt;&lt;linux-kernel&gt;&gt; v5.9.2, kernel modules, &lt;&lt;qemu-buildroot-setup,QEMU&gt;&gt;, &lt;&lt;gem5-buildroot-setup,gem5&gt;&gt; and x86_64, ARMv7 and ARMv8 &lt;&lt;userland-assembly,userland&gt;&gt; and &lt;&lt;baremetal-setup,baremetal&gt;&gt; assembly, &lt;&lt;c,ANSI C&gt;&gt;, &lt;&lt;cpp,C++&gt;&gt; and &lt;&lt;posix,POSIX&gt;&gt;. EVERYTHING is built from source. &lt;&lt;gdb&gt;&gt; and &lt;&lt;kgdb&gt;&gt; just work. Powered by &lt;&lt;about-the-qemu-buildroot-setup,Buildroot&gt;&gt; and &lt;&lt;about-the-baremetal-setup,crosstool-NG&gt;&gt;. Highly automated. Thoroughly documented. Automated &lt;&lt;test-this-repo,tests&gt;&gt;. "Tested" in an Ubuntu 20.04 host.">
<title>Linux Kernel Module Cheat</title>
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@@ -459,6 +459,17 @@ pre{ white-space:pre }
<div class="sect2">
<h3 id="tracing"><a class="anchor" href="#tracing"></a><a class="link" href="#tracing">23.9. Tracing</a></h3>
<div class="paragraph">
<p>The tracing described in this section requires rebuilding QEMU with:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>./build-qemu --extra-config-args=--enable-trace-backends=simple</pre>
</div>
</div>
<div class="paragraph">
<p>Ideally we would like to use this build option by default, but unfortunately starting on some QEMU version this started generating <code>trace-&lt;pid&gt;</code> files for every run which is far too annoying when you don&#8217;t want traces, and we don&#8217;t know how to turn it off at runtime or make the files be created in some other directory.</p>
</div>
<div class="paragraph">
<p>QEMU can log several different events.</p>
</div>
<div class="paragraph">
@@ -581,7 +592,6 @@ Call Trace:
</div>
</div>
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