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534 lines
34 KiB
HTML
534 lines
34 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>>. <<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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</head>
|
||
<body id="gem5-code-generation" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="gem5-code-generation"><a class="anchor" href="#gem5-code-generation"></a><a class="link" href="#gem5-code-generation">24.22.8. gem5 code generation</a></h4>
|
||
<div class="paragraph">
|
||
<p>gem5 uses a ton of code generation, which makes the project horrendous:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>lots of magic happen on top of pybind11, which is already magic, to more automatically glue the C++ and Python worlds: <a href="gem5-python-c-interaction.html">gem5 Python C++ interaction</a></p>
|
||
</li>
|
||
<li>
|
||
<p>.isa code which describes most of the instructions: <a href="gem5-instruction-definitions.html">gem5 instruction definitions</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-ruby-build.html">Ruby</a> for memory systems</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To find files that are not symlinks use <a href="https://stackoverflow.com/questions/16303449/how-to-find-files-excluding-symbolic-links" class="bare">https://stackoverflow.com/questions/16303449/how-to-find-files-excluding-symbolic-links</a></p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>find build -type f</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>To find the definition of generated code, do a:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>grep -I -r build/ 'code of interest'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>where:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>-I</code>: ignore binray file matches on built objects</p>
|
||
</li>
|
||
<li>
|
||
<p><code>-r</code>: ignore symlinks due to <a href="why-are-all-c-symlinked-into-the-gem5-build-dir.html">Why are all C++ symlinked into the gem5 build dir?</a> as explained at <a href="https://stackoverflow.com/questions/21738574/how-do-you-exclude-symlinks-in-a-grep" class="bare">https://stackoverflow.com/questions/21738574/how-do-you-exclude-symlinks-in-a-grep</a></p>
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<div class="paragraph">
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<p>The code generation exists partly to support insanely generic cross ISA instructions mapping to one compute model, where it might be reasonable.</p>
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<div class="paragraph">
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<p>But it has been widely overused to insanity. It likely also exists partly because when the project started in 2003 C++ compilers weren’t that good, so you couldn’t rely on features like templates that much.</p>
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<p><a href="gem5-the-isa.html">gem5 THE_ISA</a></p>
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<p>← Previous: <a href="gem5-derivo3cpu-default-functional-units.html">gem5 DerivO3CPU default functional units</a> | ↑ Up: <a href="gem5-internals.html">gem5 internals</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-the-isa.html">gem5 THE_ISA</a> →</p>
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