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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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528 lines
35 KiB
HTML
528 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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</head>
|
||
<body id="gem5-functional-requests" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect5">
|
||
<h6 id="gem5-functional-requests"><a class="anchor" href="#gem5-functional-requests"></a><a class="link" href="#gem5-functional-requests">24.21.1.1.1. gem5 functional requests</a></h6>
|
||
<div class="paragraph">
|
||
<p>As seen at <a href="gem5-functional-vs-atomic-vs-timing-memory-requests.html">gem5 functional vs atomic vs timing memory requests</a>, functional requests are not used in common simulation, since the core must always go through caches.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Functional access are therefore only used for more magic simulation functionalities.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>One such functionality, is the <a href="gem5-syscall-emulation-mode.html">gem5 syscall emulation mode</a> implementation of the <a href="futex-system-call.html">futex system call</a> which is done at <code>futexFunc</code> in <a href="https://github.com/gem5/gem5/blob/9fc9c67b4242c03f165951775be5cd0812f2a705/src/sim/syscall_emul.hh#L394"><code>src/sim/sycall_emul.hh</code></a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>As seen from <code>man futex</code>, the Linux kernel reads the value from an address that is given as the first argument of the call.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Therefore, here it makes sense for gem5 syscall implementation, which does not actually have a real kernel running, to just make a functional request and be done with it, since the impact of cache changes done by this read would be insignificant to the cost of an actual full context switch that would happen on a real syscall.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It is generally hard to implement functional requests for <a href="gem5-ruby-build.html">Ruby</a> runs, because packets are flying through the memory system in a transient state, and there is no simple way of finding exactly which ones might have the latest version of the memory. See for example:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://gem5.atlassian.net/browse/GEM5-496" class="bare">https://gem5.atlassian.net/browse/GEM5-496</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://gem5.atlassian.net/browse/GEM5-604" class="bare">https://gem5.atlassian.net/browse/GEM5-604</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://gem5.atlassian.net/browse/GEM5-675" class="bare">https://gem5.atlassian.net/browse/GEM5-675</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://gem5.atlassian.net/browse/GEM5-676" class="bare">https://gem5.atlassian.net/browse/GEM5-676</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The typical error message in that case is:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>fatal: Ruby functional read failed for address</pre>
|
||
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|
||
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|
||
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|
||
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|
||
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|
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|
||
<p>↑ Up: <a href="gem5-functional-vs-atomic-vs-timing-memory-requests.html">gem5 functional vs atomic vs timing memory requests</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="gem5-packet-vs-request.html">gem5 <code>Packet</code> vs <code>Request</code></a> →</p>
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