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Landon Curt Noll ceaee3e5f2 prep for IOCCC pending state
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<h1>The International Obfuscated C Code Contest</h1>
<h2>2024/macke - Prize in imitative rebooting</h2>
<h3>OpenRISC CPU and Linux</h3>
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<a class="Left" href="../kurdyukov4/index.html">&larr; 2024/kurdyukov4</a>
<a class="Left" href="../index.html">&uarr; 2024 &uarr;</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2024/macke/prog.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Sebastian_Macke">Sebastian Macke</a><br>
Location: <a href="../../location.html#DE">DE</a> - <em>Federal Republic of Germany</em> (<em>Germany</em>)</li>
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<h2 id="award-presentation">Award presentation:</h2>
<p>Watch the <a href="https://www.youtube.com/@OurFavoriteUniverse">Our Favorite Universe</a>
YouTube show for this entry:</p>
<blockquote>
<p><a href="https://www.youtube.com/watch?v=jeQFI_8kGA4">IOCCC28 - 2024/macke - Prize in imitative rebooting</a></p>
</blockquote>
<h2 id="to-build">To build:</h2>
<pre><code> make all</code></pre>
<h2 id="to-use">To use:</h2>
<pre><code> ./prog</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>When we ran this entry the first time (in a virtual machine window), it felt like the VM has rebooted.
Then, after the initial feeling had subsided, we were able to appreciate the entry in greater detail.</p>
<p>Have you ever wondered would what would happen if you recursively removed
files starting from the root directory? Are you curious what happens when
you launch a <a href="https://en.wikipedia.org/wiki/Fork_bomb">fork bomb</a>?
Within the safety of an virtual walls, can safely give those and other scenarios:
just check out the “<a href="#todo">Things You Can Do</a>” section below.</p>
<p><strong>NOTE</strong>: For those who do not have a clang compiler environment that
supports the <code>wasm32</code> target, we provide a <code>prog.wasm</code> file.</p>
<p><strong>SUGGESTION / REQUEST</strong>: Having a way to build custom boot-up images for this entry would be of interest.</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<h3 id="emulator-running-linux">Emulator Running Linux</h3>
<h4 id="what-it-does">What It Does</h4>
<p>This is an emulator capable of running a full modern Linux system with a minimal set of features. The system includes:</p>
<ul>
<li>An OpenRISC 32-Bit CPU</li>
<li>A Memory Management Unit</li>
<li>A UART connected to the Terminal</li>
<li>An Interrupt Controller</li>
<li>A Timer Controller</li>
</ul>
<div id="todo">
<h3 id="things-you-can-do">Things You Can Do</h3>
</div>
<h4 id="look-up-specs">Look Up Specs</h4>
<p>First, you can look up the specs of the emulated system. The following commands will give you a good overview:</p>
<pre><code> uname -a
free -h
cat /proc/cpuinfo
cat /proc/meminfo
cat /proc/interrupts
cat /proc/timer_list</code></pre>
<h4 id="fork-bomb-visualized">Fork Bomb Visualized</h4>
<p>For educational purposes, type the following two lines and watch the process tree grow:</p>
<pre><code> b(){ sleep 2; b|b; }
(b &amp;) &amp;&amp; watch -n1 pstree -p</code></pre>
<p>Or just run:</p>
<pre><code> ./fork_bomb.sh</code></pre>
<p>Note: You won’t be able to stop the emulator anymore and will need to kill the process.</p>
<h4 id="delete-filesystem">Delete Filesystem</h4>
<p>Ever wanted to know what happens when you delete your computer’s filesystem?
Now is your chance to find out!</p>
<pre><code> rm -rf /</code></pre>
<p>Even after removal, your system will still be in a well-defined state.
For example, you can still run commands such as:</p>
<pre><code> cd /proc
echo *</code></pre>
<p>Be careful: You won’t be able to stop the emulation anymore and will need to kill the process.</p>
<h4 id="run-c64-emulation">Run C64 Emulation</h4>
<p>A full-fledged C64 emulator is included. Run it via:</p>
<pre><code> ./c64</code></pre>
<p>Since the C64 is little-endian and runs on a big-endian machine, which itself runs on a little-endian machine, it combines the best of both worlds into a cool intermediate format. Might this be the future of endianness? 🤔</p>
<h4 id="run-itself">Run Itself</h4>
<p>With <code>./prog</code>, you can run the emulator within itself. This is a bit meta, but it works.
The emulator would be able to run Linux as well, but it is tweaked to run with less memory and on a big-endian machine.</p>
<h4 id="full-scripting-capabilities">Full scripting capabilities</h4>
<p>With <code>vi</code>, you got an awesome editor and can write scripts in <em>ash</em> such as.</p>
<pre><code> i=1
while [ &quot;$i&quot; -le 10 ]
do
echo &quot;Hello World&quot;
i=$(expr &quot;$i&quot; + 1)
done</code></pre>
<h4 id="run-in-the-web-browser">Run in the Web Browser</h4>
<p>Did you know that you can run this emulator in a web browser?</p>
<p>First, compile with Clang on systems that support a target of <code>wasm32</code>:</p>
<pre><code> make prog.wasm</code></pre>
<p>Then, for example, run a local web server with the following command:</p>
<pre><code> python3 -m http.server 8000</code></pre>
<p>Open your browser and go to <code>http://localhost:8000/prog.html</code>. You can now run the emulator in the browser.</p>
<h3 id="obfuscation">Obfuscation</h3>
<p>The obfuscation is mainly a result of compression, plus a healthy dose of recursion and the usual endian mischief.
For some reason, LLMs might think that this is a Smoothed Particle Hydrodynamics (SPH) simulation.</p>
<p>Sigh, so much space left. More than enough for multi-core support, a full-fledged windowing system, or networking.
Well, there’s always next year.</p>
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<h1 id="inventory-for-2024macke">Inventory for 2024/macke</h1>
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<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/prog.c">prog.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/prog.orig.c">prog.orig.c</a> - original source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/try.sh">try.sh</a> - script to try entry</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/wasm_include/stdio.h">wasm_include/stdio.h</a> - wasm include file</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/wasm_include/termios.h">wasm_include/termios.h</a> - wasm include file</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/wasm_include/unistd.h">wasm_include/unistd.h</a> - wasm include file</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2024_macke.tar.bz2">2024_macke.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/a">a</a> - virtual machine</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href=".path">.path</a> - directory path from top level directory</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2024/macke/prog.wasm">prog.wasm</a> - WebAssembly binary module</li>
<li><a href="index.html">index.html</a> - this web page</li>
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