The location of the link is in the About menu under the 'Contacting the IOCCC' and above 'Thanks for the help'. At first I had it at the very bottom, under 'IOCCC markdown guidelines', but it seemed better to have it closer to contacting the IOCCC. This is the same location in the no JavaScript menu (which, for those who do not know or forget, is not a requirement except for some screen sizes). The top level Makefile has a new 'security' rule. Updated make help. Typo fixes in make help. SECURITY.html has had a few updates as well: change the wording of entry code is unsupported (it now says 'ALL CODE IN ALL IOCCC ENTRIES IS UNSUPPORTED!!') and it now links to the mkiocccentry repo and how to report a possible security vulnerability in that repo; as that IS supported - and since there was reference to discussing security concerns is in SECURITY.html - even though the entries will not receive security updates - it seemed a good idea to have a link to report such security issues in the mkiocccentry repo. Perhaps the FAQ needs to be updated for this too.
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IOCCC markdown guidelines
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Contest status
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Rules and Guidelines
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IOCCC News
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Frequently Asked Questions
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#submit">
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How to enter the IOCCC
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#fix_an_entry">
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Fixing IOCCC entries
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#fix_web_site">
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Fixing the website
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</a>
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<a class="mobile-submenu-item" href="../../faq.html#fix_author">
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Fixing author info
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IOCCC Home
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The IOCCC Judges
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</a>
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<a class="mobile-submenu-item" href="../../contact.html">
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Contacting the IOCCC
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</a>
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<a class="mobile-submenu-item" href="../../thanks-for-help.html">
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Thanks for the help
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</a>
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</div>
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<script>
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var headerOpenMenuButton = document.getElementById("header-open-menu-button");
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<div class="header">
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<a href="../../2011/zucker/index.html">
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<img src="../../png/ioccc.png"
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alt="IOCCC image by Matt Zucker"
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width=300
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height=110>
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</a>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2004/gavin - Best of Show</h2>
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</div>
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<!-- END: this line ends content from: inc/header.default.html -->
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<div class="navbar">
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<a class="Left" href="../gavare/index.html">← gavare</a>
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<a class="Left" href="../index.html">↑ 2004 ↑</a>
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<a class="Left" href="../hibachi/index.html">hibachi →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2004%2Fgavin%2Findex.html">✓</a>
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</div>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Gavin_Barraclough">Gavin Barraclough</a><br>
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Location: <a href="../../location.html#UK">UK</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>There is an alternate version for those who wish to use QEMU rather than having
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to reboot and rely on having a floppy drive (if you even remember what those are
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:-) ) etc. See <a href="#alternate-code">alternate code</a> below.</p>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<pre><code> STATUS: compiled executable crashes - please help us fix
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STATUS: doesn't work with some platforms - please help us fix
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STATUS: INABIAF - please DO NOT fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2004_gavin">2004/gavin in bugs.html</a>.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./gavin</code></pre>
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<h2 id="try">Try:</h2>
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<p>To enjoy the results (on a Linux/x86 machine) with a floppy drive (remember
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those? We do!):</p>
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<pre><code> su</code></pre>
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<p>Make a floppy with an ext2 filesystem (<code>mke2fs /dev/fd0</code> replacing <code>fd0</code> with
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whatever the floppy device is!), mount it under <code>/mnt/floppy</code> and then:</p>
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<pre><code> cp kernel fs.tar lilo.conf boot.b /mnt/floppy</code></pre>
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<p>NOTE: If the version of your lilo is not 21.4, use the appropriate boot.b file.</p>
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<p>NOTE: If your floppy drive is not <code>/dev/fd0</code>, edit lilo.conf appropriately.</p>
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<pre><code> lilo -C /mnt/floppy/lilo.conf</code></pre>
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<p>Boot from the floppy on an x86 machine with a PS/2 keyboard and mouse.
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Move the window away from the corner.</p>
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<pre><code> vi gavin.c</code></pre>
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<p>Scroll up and down the file with up-arrow and down-arrow.</p>
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<pre><code> sh</code></pre>
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<p>You can have several shell windows:</p>
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<pre><code> vi README.md
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./prim</code></pre>
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<p>Press and hold any key.</p>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>This version’s main difference is that the macro <code>K</code> is redefined to <code>1</code> so that
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you can use it with <code>QEMU</code>.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>The use is mostly the same as <code>gavin</code> except that one initially executes <code>gavin.alt</code>
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(which <code>make alt</code> will do) and one will have to use <code>QEMU</code> instead. The files
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generated are the same names. See <a href="#to-use">to use</a> and <a href="#try">try</a> above as
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well as the judges’ remarks below plus <a href="gavin.html">gavin.html</a>.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>Over the years, we’ve seen a program that immediately dumps core if executed on
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the “wrong” architectures (e.g., <a href="../../1984/mullender/index.html">1984/mullender</a> entry) and a
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program that dumps core after a while (e.g., <a href="../../2001/bellard/index.html">2001/bellard</a> entry).
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This entry will happily compile and execute on most any architecture - the trick
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is that the result, to be useful, must be produced (and can only be enjoyed) on
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a particular architecture. We have not decided yet whether to disallow this for
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future contests.</p>
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<p>If you do not want to mess with a floppy and you use GRUB, see
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<a href="gavin.html">gavin.html</a>.</p>
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<p>You can put additional text files in <code>fs.tar</code> for browsing with vi.</p>
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<p>If you do not want to bother rebooting your computer at all, see
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<a href="http://bellard.org" class="uri">http://bellard.org</a> for QEMU (<a href="../../authors.html#Fabrice_Bellard">Fabrice Bellard</a>
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is an IOCCC 2001 winning entry), but your experience will be limited; use the
|
||
<a href="#alternate-code">alternate code</a> instead. You’ll have to move the mouse to
|
||
trigger the initial screen update.</p>
|
||
<p>The judges were able to write a few more programs to run in this OS.
|
||
What are the limitations for such programs?</p>
|
||
<p>What can you do and what can you not do in such programs?</p>
|
||
<p>The program called <code>prim</code>, written by the judges, computes and prints prime
|
||
numbers.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p>This is a 32-bit multitasking operating system for x86 computers, with GUI and
|
||
filesystem, support for loading and executing user applications in ELF binary
|
||
format, with PS/2 mouse and keyboard drivers, and VESA graphics. And a command
|
||
shell. And an application - a simple text-file viewer.</p>
|
||
<p>The OS has ended up as a traditional monolith with one entry point for syscalls,
|
||
with apps treated as cooperative-multitasking tasks that can be sent different
|
||
messages (e.g. ‘initialize’, ‘key hit’, ‘render to buffer’) through their main
|
||
entry point, and which will return control to the OS after having performed the
|
||
necessary work. Applications are passed a pointer to their task structure,
|
||
which is partially defined by the OS, and partially for the application’s own
|
||
use.</p>
|
||
<p>The program compiles into a tool to build a kernel image,
|
||
so having built the program, the <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/Makefile">Makefile</a> will run it,
|
||
redirecting the output into a file called <code>kernel</code>.
|
||
The Makefile will then proceed to build a root filesystem image.
|
||
This involves rebuilding the program with different compiler flags,
|
||
then building a tarball containing the resulting programs
|
||
(the filesystem format supported by the OS is the tarball format).</p>
|
||
<p>For further usage information see <a href="gavin.html">gavin.html</a>.</p>
|
||
<p>The filenames <code>vi</code> and <code>sh</code> are significant, and should not be changed.</p>
|
||
<h3 id="known-features">Known ‘features’</h3>
|
||
<p>Known issues are really too plentiful to list.</p>
|
||
<p>If the mouse pointer goes off the left hand side of the screen
|
||
it will reappear on the right, and vice-versa.
|
||
If it goes off the top or bottom, it will go and corrupt some memory.</p>
|
||
<p>The file system is kinda optimistic about matching names, so,
|
||
for example if you type the command <code>shell</code> into a command-line
|
||
it will execute the program <code>sh</code> - close enough a match for it.</p>
|
||
<p>The <a href="https://en.wikipedia.org/wiki/Executable_and_Linkable_Format">ELF binaries</a>
|
||
are not loaded at the correct address, and their entry point must be the start
|
||
address of the <a href="https://en.wikipedia.org/wiki/Code_segment">text segment</a>.</p>
|
||
<p>The keyboard driver can cope with the basic alpha-numeric keys,
|
||
but gets confused by fancy things like <code>shift</code> or <code>backspace</code>.</p>
|
||
<p>In the text-file viewer, <code>vi</code>, the up/down and PgUp/PgDn keys
|
||
scroll up or down by one line. There is nothing to stop you
|
||
from scrolling above the top of the file, and pressing any
|
||
other keys might have an undefined effect.</p>
|
||
<p>The x86 is bootstrapped into 32bit mode in 6 instructions, with 4 more to set up
|
||
data/stack segments and a stack-pointer to allow C code to be run. On top of
|
||
this there are also about a dozen instructions to switch the video card into
|
||
graphics mode. All in all, a relatively tiny number of instructions next to the
|
||
size of the C program. Also, the string is mostly composed of data - a
|
||
Linux-esque kernel header for the bootloader, protected mode descriptor tables,
|
||
keyboard maps, etc. (I should also mention that it contains mini functions to
|
||
perform an x86 <code>in</code> and <code>out</code> instruction - to allow the keyboard & mouse to be
|
||
driven from C code).</p>
|
||
<p>Porting to another architecture should be relatively easy* -
|
||
the string simply needs be replaced with one containing
|
||
data & code suitable for the new target platform.
|
||
Accesses to data in the string are made relative to the define <code>V</code>,
|
||
so these may need updating as appropriate (<code>0x90200</code> is the address
|
||
at which a Linux bootloader loads an x86 kernel image).</p>
|
||
<pre><code> \* ;-)</code></pre>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
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|
||
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|
||
|
||
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|
||
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|
||
|
||
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|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2004gavin">Inventory for 2004/gavin</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.c">gavin.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.alt.c">gavin.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.orig.c">gavin.orig.c</a> - original source code</li>
|
||
<li><a href="gavin.html">gavin.html</a> - author’s usage guide</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/lilo.conf">lilo.conf</a> - lilo boot loader configuration</li>
|
||
<li><a href="boot.b">boot.b</a> - boot sector</li>
|
||
<li><a href="img/fs.tar">img/fs.tar</a> - tarball of root file system</li>
|
||
<li><a href="img/kernel">img/kernel</a> - x86 linux boot executable zImage</li>
|
||
<li><a href="prim">prim</a> - prime number printing program from judges</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2004_gavin.tar.bz2">2004_gavin.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/gavin.md">gavin.md</a> - markdown source for gavin.html</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2004/gavin/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
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||
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|
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</div>
|
||
|
||
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||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2004%2Fgavin%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
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||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
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