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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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543 lines
35 KiB
HTML
543 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>
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<body id="exit-gem5-on-panic" class="article">
|
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<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect5">
|
||
<h6 id="exit-gem5-on-panic"><a class="anchor" href="#exit-gem5-on-panic"></a><a class="link" href="#exit-gem5-on-panic">17.6.1.3.2. Exit gem5 on panic</a></h6>
|
||
<div class="paragraph">
|
||
<p>gem5 9048ef0ffbf21bedb803b785fb68f83e95c04db8 (January 2019) can detect panics automatically if the option <code>system.panic_on_panic</code> is on.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>It parses kernel symbols and detecting when the PC reaches the address of the <code>panic</code> function. gem5 then prints to stdout:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>Kernel panic in simulated kernel</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and exits with status -6.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>At gem5 ff52563a214c71fcd1e21e9f00ad839612032e3b (July 2018) behaviour was different, and just exited 0: <a href="https://www.mail-archive.com/gem5-users@gem5.org/msg15870.html" class="bare">https://www.mail-archive.com/gem5-users@gem5.org/msg15870.html</a> TODO find fixing commit.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>We enable the <code>system.panic_on_panic</code> option by default on <code>arm</code> and <code>aarch64</code>, which makes gem5 exit immediately in case of panic, which is awesome!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>If we don’t set <code>system.panic_on_panic</code>, then gem5 just hangs on an infinite guest loop.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: why doesn’t gem5 x86 ff52563a214c71fcd1e21e9f00ad839612032e3b support <code>system.panic_on_panic</code> as well? Trying to set <code>system.panic_on_panic</code> there fails with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>tried to set or access non-existentobject parameter: panic_on_panic</pre>
|
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</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>However, at that commit panic on x86 makes gem5 crash with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>panic: i8042 "System reset" command not implemented.</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which is a good side effect of an unimplemented hardware feature, since the simulation actually stops.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The implementation of panic detection happens at: <a href="https://github.com/gem5/gem5/blob/1da285dfcc31b904afc27e440544d006aae25b38/src/arch/arm/linux/system.cc#L73" class="bare">https://github.com/gem5/gem5/blob/1da285dfcc31b904afc27e440544d006aae25b38/src/arch/arm/linux/system.cc#L73</a></p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> kernelPanicEvent = addKernelFuncEventOrPanic<Linux::KernelPanicEvent>(
|
||
"panic", "Kernel panic in simulated kernel", dmesg_output);</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Here we see that the symbol <code>"panic"</code> for the <code>panic()</code> function is the one being tracked.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Related thread: <a href="https://stackoverflow.com/questions/56032347/is-there-a-way-to-identify-if-gem5-run-got-over-successfully" class="bare">https://stackoverflow.com/questions/56032347/is-there-a-way-to-identify-if-gem5-run-got-over-successfully</a></p>
|
||
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|
||
<p>← Previous: <a href="exit-qemu-on-panic.html">Exit QEMU on panic</a> | ↑ Up: <a href="exit-emulator-on-panic.html">Exit emulator on panic</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="reboot-on-panic.html">Reboot on panic</a> →</p>
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