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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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553 lines
35 KiB
HTML
553 lines
35 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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|
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|
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|
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</head>
|
||
<body id="about-the-prebuilt-setup" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="about-the-prebuilt-setup"><a class="anchor" href="#about-the-prebuilt-setup"></a><a class="link" href="#about-the-prebuilt-setup">2.6.1. About the prebuilt setup</a></h4>
|
||
<div class="paragraph">
|
||
<p>This setup uses prebuilt binaries that we upload to GitHub from time to time.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We don’t currently provide a full prebuilt because it would be too big to host freely, notably because of the cross toolchain.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Our prebuilts currently include:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="qemu-buildroot-setup.html">QEMU Buildroot setup</a> binaries</p>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>Linux kernel</p>
|
||
</li>
|
||
<li>
|
||
<p>root filesystem</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p><a href="baremetal-setup.html">Baremetal setup</a> binaries for QEMU</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>For more details, see our our <a href="release.html">release procedure</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Advantage of this setup: saves time and disk space on the initial install, which is expensive in largely due to building the toolchain.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The limitations are severe however:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>can’t <a href="gdb.html">GDB step debug the kernel</a>, since the source and cross toolchain with GDB are not available. Buildroot cannot easily use a host toolchain: <a href="prebuilt-toolchain.html">Section 35.2.3.1.1, “Buildroot use prebuilt host toolchain”</a>.</p>
|
||
<div class="paragraph">
|
||
<p>Maybe we could work around this by just downloading the kernel source somehow, and using a host prebuilt GDB, but we felt that it would be too messy and unreliable.</p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>you won’t get the latest version of this repository. Our <a href="travis.html">Travis</a> attempt to automate builds failed, and storing a release for every commit would likely make GitHub mad at us anyway.</p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5.html">gem5</a> is not currently supported. The major blocking point is how to avoid distributing the kernel images twice: once for gem5 which uses <code>vmlinux</code>, and once for QEMU which uses <code>arch/*</code> images, see also:</p>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://github.com/cirosantilli/linux-kernel-module-cheat/issues/79" class="bare">https://github.com/cirosantilli/linux-kernel-module-cheat/issues/79</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="vmlinux-vs-bzimage-vs-zimage-vs-image.html">vmlinux vs bzImage vs zImage vs Image</a>.</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This setup might be good enough for those developing simulators, as that requires less image modification. But once again, if you are serious about this, why not just let your computer build the <a href="qemu-buildroot-setup.html">full featured setup</a> while you take a coffee or a nap? :-)</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
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|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="prebuilt.html">Prebuilt setup</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="prebuilt-setup-getting-started.html">Prebuilt setup getting started</a> →</p>
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