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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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570 lines
35 KiB
HTML
570 lines
35 KiB
HTML
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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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|
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|
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|
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|
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|
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.nav-footer > p > a {white-space: nowrap;}</style>
|
||
</head>
|
||
<body id="prebuilt-setup-getting-started" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="prebuilt-setup-getting-started"><a class="anchor" href="#prebuilt-setup-getting-started"></a><a class="link" href="#prebuilt-setup-getting-started">2.6.2. Prebuilt setup getting started</a></h4>
|
||
<div class="paragraph">
|
||
<p>Checkout to the latest tag and use the Ubuntu packaged QEMU to boot Linux:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>sudo apt-get install qemu-system-x86
|
||
git clone https://github.com/cirosantilli/linux-kernel-module-cheat
|
||
cd linux-kernel-module-cheat
|
||
git checkout "$(git rev-list --tags --max-count=1)"
|
||
./release-download-latest
|
||
unzip lkmc-*.zip
|
||
./run --qemu-which host</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>You have to checkout to the latest tag to ensure that the scripts match the release format: <a href="https://stackoverflow.com/questions/1404796/how-to-get-the-latest-tag-name-in-current-branch-in-git" class="bare">https://stackoverflow.com/questions/1404796/how-to-get-the-latest-tag-name-in-current-branch-in-git</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This is known not to work for aarch64 on an Ubuntu 16.04 host with QEMU 2.5.0, presumably because QEMU is too old, the terminal does not show any output. I haven’t investigated why.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Or to run a baremetal example instead:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run \
|
||
--arch aarch64 \
|
||
--baremetal userland/c/hello.c \
|
||
--qemu-which host \
|
||
;</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Be saner and use our custom built QEMU instead:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>python3 -m venv .venv
|
||
. .venv/bin/activate
|
||
./setup
|
||
./build --download-dependencies qemu
|
||
./run</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To build the kernel modules as in <a href="your-first-kernel-module-hack.html">Your first kernel module hack</a> do:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>git submodule update --depth 1 --init --recursive "$(./getvar linux_source_dir)"
|
||
./build-linux --no-modules-install -- modules_prepare
|
||
./build-modules --gcc-which host
|
||
./run</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: for now the only way to test those modules out without <a href="qemu-buildroot-setup-getting-started.html">building Buildroot</a> is with 9p, since we currently rely on Buildroot to manipulate the root filesystem.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Command explanation:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>modules_prepare</code> does the minimal build procedure required on the kernel for us to be able to compile the kernel modules, and is way faster than doing a full kernel build. A full kernel build would also work however.</p>
|
||
</li>
|
||
<li>
|
||
<p><code>--gcc-which host</code> selects your host Ubuntu packaged GCC, since you don’t have the Buildroot toolchain</p>
|
||
</li>
|
||
<li>
|
||
<p><code>--no-modules-install</code> is required otherwise the <code>make modules_install</code> target we run by default fails, since the kernel wasn’t built</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To modify the Linux kernel, build and use it as usual:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>git submodule update --depth 1 --init --recursive "$(./getvar linux_source_dir)"
|
||
./build-linux
|
||
./run</pre>
|
||
</div>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="about-the-prebuilt-setup.html">About the prebuilt setup</a> | ↑ Up: <a href="prebuilt.html">Prebuilt setup</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="host.html">Host kernel module setup</a> →</p>
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