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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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569 lines
36 KiB
HTML
569 lines
36 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>>. EVERYTHING is built from source. <<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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<style>
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margin-left:40px;
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padding-right:60px;
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max-width:none;
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}
|
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</style>
|
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<style>.toc-current{font-weight: bold;} .toc-root{font-family: "Open Sans","DejaVu Sans",sans-serif;
|
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font-size: 0.9em;} #content{display: flex; flex-direction: column; flex: 1 1 auto;}
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.nav-footer{text-align: center; margin-top: auto;}
|
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.nav-footer > p > a {white-space: nowrap;}</style>
|
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</head>
|
||
<body id="dry-run" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect2">
|
||
<h3 id="dry-run"><a class="anchor" href="#dry-run"></a><a class="link" href="#dry-run">2.3. Dry run to get commands for your project</a></h3>
|
||
<div class="paragraph">
|
||
<p>One of the major features of this repository is that we try to support the <code>--dry-run</code> option really well for all scripts.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This option, as the name suggests, outputs the external commands that would be run (or more precisely: equivalent commands), without actually running them.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This allows you to just clone this repository and get full working commands to integrate into your project, without having to build or use this setup further!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For example, we can obtain a QEMU run for the file <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/c/hello.c">userland/c/hello.c</a> in <a href="user-mode-simulation.html">User mode simulation</a> by adding <code>--dry-run</code> to the normal command:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run --dry-run --userland userland/c/hello.c</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which as of LKMC a18f28e263c91362519ef550150b5c9d75fa3679 + 1 outputs:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>+ /path/to/linux-kernel-module-cheat/out/qemu/default/opt/x86_64-linux-user/qemu-x86_64 \
|
||
-L /path/to/linux-kernel-module-cheat/out/buildroot/build/default/x86_64/target \
|
||
-r 5.2.1 \
|
||
-seed 0 \
|
||
-trace enable=load_file,file=/path/to/linux-kernel-module-cheat/out/run/qemu/x86_64/0/trace.bin \
|
||
-cpu max \
|
||
/path/to/linux-kernel-module-cheat/out/userland/default/x86_64/c/hello.out \
|
||
;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So observe that the command contains:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>+</code>: sign to differentiate it from program stdout, much like bash <code>-x</code> output. This is not a valid part of the generated Bash command however.</p>
|
||
</li>
|
||
<li>
|
||
<p>the actual command nicely, indented and with arguments broken one per line, but with continuing backslashes so you can just copy paste into a terminal</p>
|
||
<div class="paragraph">
|
||
<p>For setups that don’t support the newline e.g. <a href="gem5-eclipse-configuration.html">Eclipse debugging</a>, you can turn them off with <code>--print-cmd-oneline</code></p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p><code>;</code>: both a valid part of the Bash command, and a visual mark the end of the command</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For the specific case of running emulators such as QEMU, the last command is also automatically placed in a file for your convenience and later inspection:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat "$(./getvar run_dir)/run.sh"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Since we need this so often, the last run command is also stored for convenience at:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat out/run.sh</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>although this won’t of course work well for <a href="simultaneous-runs.html">Simultaneous runs</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Furthermore, <code>--dry-run</code> also automatically specifies, in valid Bash shell syntax:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>environment variables used to run the command with syntax <code>+ ENV_VAR_1=abc ENV_VAR_2=def ./some/command</code></p>
|
||
</li>
|
||
<li>
|
||
<p>change in working directory with <code>+ cd /some/new/path && ./some/command</code></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="about-the-qemu-buildroot-setup.html">About the QEMU Buildroot setup</a> | ↑ Up: <a href="getting-started.html">Getting started</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-buildroot-setup.html">gem5 Buildroot setup</a> →</p>
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