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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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575 lines
35 KiB
HTML
575 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="user-mode-simulation" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect1">
|
||
<h2 id="user-mode-simulation"><a class="anchor" href="#user-mode-simulation"></a><a class="link" href="#user-mode-simulation">11. User mode simulation</a></h2>
|
||
<div class="sectionbody">
|
||
<div class="paragraph">
|
||
<p>Both QEMU and gem5 have an user mode simulation mode in addition to full system simulation that we consider elsewhere in this project.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>In QEMU, it is called just <a href="qemu-user-mode-getting-started.html">"user mode"</a>, and in gem5 it is called <a href="gem5-syscall-emulation-mode.html">syscall emulation mode</a>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>In both, the basic idea is the same.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>User mode simulation takes regular userland executables of any arch as input and executes them directly, without booting a kernel.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Instead of simulating the full system, it translates normal instructions like in full system mode, but magically forwards system calls to the host OS.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Advantages over full system simulation:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>the simulation may <a href="user-mode-vs-full-system-benchmark.html">run faster</a> since you don’t have to simulate the Linux kernel and several device models</p>
|
||
</li>
|
||
<li>
|
||
<p>you don’t need to build your own kernel or root filesystem, which saves time. You still need a toolchain however, but the pre-packaged ones may work fine.</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Disadvantages:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>lower guest to host portability:</p>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p>TODO confirm: host OS == guest OS?</p>
|
||
</li>
|
||
<li>
|
||
<p>TODO confirm: the host Linux kernel should be newer than the kernel the executable was built for.</p>
|
||
<div class="paragraph">
|
||
<p>It may still work even if that is not the case, but could fail is a missing system call is reached.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The target Linux kernel of the executable is a GCC toolchain build-time configuration.</p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>emulator implementers have to keep up with libc changes, some of which break even a C hello world due setup code executed before main.</p>
|
||
<div class="paragraph">
|
||
<p>See also: <a href="user-mode-simulation-with-glibc.html">Section 11.4, “User mode simulation with glibc”</a></p>
|
||
</div>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p>cannot be used to test the Linux kernel or any devices, and results are less representative of a real system since we are faking more</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="qemu-user-mode-getting-started.html">QEMU user mode getting started</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="user-mode-tests.html">User mode tests</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="user-mode-buildroot-executables.html">User mode Buildroot executables</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="user-mode-simulation-with-glibc.html">User mode simulation with glibc</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="user-mode-static-executables.html">User mode static executables</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="syscall-emulation-mode-program-stdin.html">syscall emulation mode program stdin</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="gem5-syscall-emulation-mode.html">gem5 syscall emulation mode</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="qemu-user-mode-quirks.html">QEMU user mode quirks</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="gem5-kvm.html">gem5 KVM</a> | ↑ Up: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="qemu-user-mode-getting-started.html">QEMU user mode getting started</a> →</p>
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