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mips_book.html
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<title>MIPS Assembly Programmming</title>
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</head>
<body class="book">
<div id="header">
<h1>MIPS Assembly Programmming</h1>
<div class="details">
<span id="author" class="author">Robert Winkler</span><br>
<span id="email" class="email"><a href="mailto:books@robertwinkler.com">books@robertwinkler.com</a></span><br>
<span id="revnumber">version 1.0.4,</span>
<span id="revdate">2023-12-15</span>
</div>
<div id="toc" class="toc">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_info">Info</a></li>
<li><a href="#_dedication">Dedication</a></li>
<li><a href="#_chapter_0_hello_world">Chapter 0: Hello World</a>
<ul class="sectlevel2">
<li><a href="#_prereqs">Prereqs</a></li>
<li><a href="#_system_setup">System Setup</a></li>
<li><a href="#_handy_resources">Handy Resources</a></li>
<li><a href="#_hello_world">Hello World</a></li>
<li><a href="#_building_and_running">Building and Running</a></li>
<li><a href="#_conclusion">Conclusion</a></li>
<li><a href="#_exercises">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_1_data">Chapter 1: Data</a>
<ul class="sectlevel2">
<li><a href="#_arrays">Arrays</a></li>
<li><a href="#_exercises_2">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_2_system_calls">Chapter 2: System Calls</a>
<ul class="sectlevel2">
<li><a href="#_examples">Examples</a></li>
<li><a href="#_exercises_3">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_3_branches_and_logic">Chapter 3: Branches and Logic</a>
<ul class="sectlevel2">
<li><a href="#_practice">Practice</a></li>
<li><a href="#_conclusion_2">Conclusion</a></li>
<li><a href="#_exercises_4">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_4_loops">Chapter 4: Loops</a>
<ul class="sectlevel2">
<li><a href="#_looping_through_arrays">Looping Through Arrays</a></li>
<li><a href="#_conclusion_3">Conclusion</a></li>
<li><a href="#_exercises_5">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_5_functions_and_the_mips_calling_convention">Chapter 5: Functions and the MIPS Calling Convention</a>
<ul class="sectlevel2">
<li><a href="#_functions">Functions</a></li>
<li><a href="#_the_convention">The Convention</a></li>
<li><a href="#_conclusion_4">Conclusion</a></li>
<li><a href="#_exercises_6">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_6_floating_point_types">Chapter 6: Floating Point Types</a>
<ul class="sectlevel2">
<li><a href="#_floating_point_registers_and_instructions">Floating Point Registers and Instructions</a></li>
<li><a href="#_practice_2">Practice</a></li>
<li><a href="#_getting_floating_point_literals">Getting Floating Point Literals</a></li>
<li><a href="#_branching">Branching</a></li>
<li><a href="#_functions_2">Functions</a></li>
<li><a href="#_conclusion_5">Conclusion</a></li>
<li><a href="#_exercises_7">Exercises</a></li>
</ul>
</li>
<li><a href="#_chapter_7_tips_and_tricks">Chapter 7: Tips and Tricks</a>
<ul class="sectlevel2">
<li><a href="#_formatting">Formatting</a></li>
<li><a href="#_misc_general_tips">Misc. General Tips</a></li>
<li><a href="#_constants">Constants</a></li>
<li><a href="#_macros">Macros</a></li>
<li><a href="#_switch_case_statements">Switch-Case Statements</a></li>
<li><a href="#_command_line_arguments">Command Line Arguments</a></li>
<li><a href="#_delayed_branches_and_delayed_loads">Delayed Branches and Delayed Loads</a></li>
<li><a href="#_no_pseudoinstructions_allowed">No Pseudoinstructions Allowed</a></li>
<li><a href="#_exercises_8">Exercises</a></li>
</ul>
</li>
<li><a href="#_references_and_useful_links">References and Useful Links</a></li>
<li><a href="#_supporters">Supporters</a>
<ul class="sectlevel2">
<li><a href="#_corporate">Corporate</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_info">Info</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Copyright © 2021-2023 <a href="http://robertwinkler.com">Robert Winkler</a></p>
</div>
<div class="paragraph">
<p>Licensed under <a href="https://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons</a>.</p>
</div>
<div class="paragraph">
<p>This book is available online in both
<a href="http://www.robertwinkler.com/projects/mips_book/mips_book.html">HTML</a> and
<a href="http://www.robertwinkler.com/projects/mips_book/mips_book.pdf">PDF</a> form.</p>
</div>
<div class="paragraph">
<p>You can support the book and purchase the chapter exercise solutions
<a href="https://store.robertwinkler.com/">here</a>.</p>
</div>
<div class="paragraph">
<p>The repo for the book, where you can get the code referenced and report
any errors (submit an issue or even a pull request) is
<a href="https://github.com/rswinkle/mips_book">here</a>.</p>
</div>
<div class="paragraph">
<p>If you’re interested in contacting me regarding MIPS tutoring or any other
business request related to the book, you can reach me at <a href="mailto:books@robertwinkler.com">books@robertwinkler.com</a>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_dedication">Dedication</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This book is dedicated to all its <a href="#_supporters">supporters</a> and all the students
I’ve helped with MIPS over the years who inspired me to create it.</p>
</div>
<div class="paragraph">
<p>Thank you.</p>
</div>
<div class="paragraph">
<p>An extra thank you goes to the corporate level sponsors below:</p>
</div>
<table class="tableblock frame-none grid-none fit-content">
<colgroup>
<col>
<col>
<col>
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><div class="content"><div class="imageblock">
<div class="content">
<a class="image" href="http://www.robertwinkler.com/projects/mips_book/"><img src="images/mips_book.png" alt="Cover Logo" width="250" height="250"></a>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="imageblock">
<div class="content">
<a class="image" href="http://www.robertwinkler.com/"><img src="images/gravatar_250.png" alt="My Gravatar" width="250" height="250"></a>
</div>
</div></div></td>
<td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
<p> </p>
</div></div></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="_chapter_0_hello_world">Chapter 0: Hello World</h2>
<div class="sectionbody">
<div class="paragraph">
<p>In which we lay the groundwork for the rest of the book…​</p>
</div>
<div class="sect2">
<h3 id="_prereqs">Prereqs</h3>
<div class="paragraph">
<p>While someone with no programming experience could probably learn MIPS from this
book, it is definitely preferable to have at least some experience in a higher
level imperative programming language. I say imperative, because programming
in assembly is the antithesis of functional programming; everything is about
state, with each line changing the state of the CPU and sometimes memory. Given
that, experience in functional languages like Lisp, Scheme etc. are less helpful
than experience in C/C++, Java, Python, Javascript etc.</p>
</div>
<div class="paragraph">
<p>Of all of the latter, C is the best, with C++ being a close second because at least
all of C exists in C++. There are many reasons C is the best prior experience when
learning assembly (any assembly, not just MIPS), including the following:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>pointers, concepts and symmetry of "address of" and "dereference" operators</p>
</li>
<li>
<p>pointer/array syntax equivalence</p>
</li>
<li>
<p>stack allocation as the default</p>
</li>
<li>
<p>manual memory management, no garbage collector</p>
</li>
<li>
<p>global data</p>
</li>
<li>
<p>rough equivalence in structure of a C program and an assembly program (vs. say Java)</p>
</li>
<li>
<p>pass by value</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>There is some overlap between those and there are probably more, but you can see that
most other languages that are commonly taught as first languages are missing most, if
not all of those things.</p>
</div>
<div class="paragraph">
<p>Even C++, which technically has all of them, being a superset of C,
is usually taught in a way that mostly ignores all of those things. They teach
C++ as if it’s Java, never teaching the fundamentals. In any case this
is getting into my problems with CS pedagogy of the last 20 years based on my
experience as a CS major myself ('12) and as a programming tutor helping college
students across the country since 2016, and I should save it for a proper
essay/rant sometime.</p>
</div>
<div class="paragraph">
<p>Long story short, I use C code and C syntax to help explain and teach MIPS. I’ll
try to provide enough explanation regardless of past experience as best I can.</p>
</div>
</div>
<div class="sect2">
<h3 id="_system_setup">System Setup</h3>
<div class="paragraph">
<p>As I tell all of my tutoring students, if you’re majoring in CS or anything related
I highly recommend you use Linux. It’s easier in every way to do dev work
on Linux vs Windows or Mac. Many assignments require it, which often necessitates
using a virtual machine (which is painful, especially on laptops) and/or ssh-ing
into a school Linux server, which is also less than ideal. In general, you’ll have
to learn how to use the Unix terminal eventually and will probably use it to some
extent in your career so it also makes sense to get used to it asap.</p>
</div>
<div class="paragraph">
<p>That being said, Windows does now have WSL so you can get the full Ubuntu or Debian
or Fedora etc. terminal based system on Windows without having to setup a real
virtual machine (or dealing with the slowdown that would cause). I’ve even heard
that they’ll get support for Linux GUI programs soon.</p>
</div>
<div class="paragraph">
<p>MacOS on the other hand, is technically a Unix based system and you can use their
terminal and install virtually any program from there using Macports or Homebrew
or similar.</p>
</div>
<div class="paragraph">
<p>There are 3 commonly used MIPS simulators that I know of:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>SPIM is probably the oldest and is terminal only</p>
</li>
<li>
<p>QtSpim is a GUI front end for SPIM</p>
</li>
<li>
<p>MARS is a Java GUI based simulator with dozens of extra syscalls, syntactic
sugar and features like graphics, memory mapped I/O, etc.</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>SPIM and QtSpim are in the Debian/Ubuntu repos so you can install them with the following</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="console"><span></span><span class="tok-gp">$ </span>sudo<span class="tok-w"> </span>apt<span class="tok-w"> </span>install<span class="tok-w"> </span>qtspim<span class="tok-w"> </span>spim</code></pre>
</div>
</div>
<div class="paragraph">
<p>You can probably find them in the repos for other distros too and install them similarly.</p>
</div>
<div class="paragraph">
<p>If it’s not in your repos or you’re on Windows (and not using WSL) or Mac you can
download them, and MARS at these addresses</p>
</div>
<div class="ulist">
<ul>
<li>
<p><a href="https://courses.missouristate.edu/KenVollmar/mars/download.htm">MARS</a></p>
</li>
<li>
<p><a href="https://sourceforge.net/projects/spimsimulator/files/">QtSpim</a></p>
</li>
</ul>
</div>
</div>
<div class="sect2">
<h3 id="_handy_resources">Handy Resources</h3>
<div class="paragraph">
<p>There are a few references that you should bookmark (or download) before you get started.
The first is the
<a href="https://raw.githubusercontent.com/rswinkle/mips_book/master/references/MIPS_Green_Sheet.pdf">MIPS Greensheet</a>.
It’s possible you already have a physical copy of this as it’s actually the tearout from the Patterson
and Hennessey textbook <a href="https://amzn.to/3zN71KP"><em>Computer Architecture and Design</em></a>
that is commonly used in college courses.</p>
</div>
<div class="paragraph">
<p>The second thing is the list of <a href="https://courses.missouristate.edu/KenVollmar/mars/Help/SyscallHelp.html">syscalls</a>
from the MARS website.</p>
</div>
<div class="paragraph">
<p>I recommend you download/bookmark both and keep them open while working because
you’ll be referencing them often to remind yourself which instructions and syscalls
you have available and how they work.</p>
</div>
</div>
<div class="sect2">
<h3 id="_hello_world">Hello World</h3>
<div class="paragraph">
<p>Let’s start with the classic hello world program, first in C, then in MIPS, and go
over all the pieces in overview. You can copy paste these into your editor of choice
(mine being neovim), or use the files in the associated repo to follow along.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><div class="lineno"><table class="linenotable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal">1</span>
<span class="normal">2</span>
<span class="normal">3</span>
<span class="normal">4</span>
<span class="normal">5</span>
<span class="normal">6</span>
<span class="normal">7</span></pre></div></td><td class="code"><div><pre><span></span><span class="tok-cp">#include</span><span class="tok-w"> </span><span class="tok-cpf"><stdio.h></span>
<span class="tok-kt">int</span><span class="tok-w"> </span><span class="tok-nf">main</span><span class="tok-p">()</span>
<span class="tok-p">{</span>
<span class="tok-w"> </span><span class="tok-n">printf</span><span class="tok-p">(</span><span class="tok-s">"Hello World!</span><span class="tok-se">\n</span><span class="tok-s">"</span><span class="tok-p">);</span>
<span class="tok-w"> </span><span class="tok-k">return</span><span class="tok-w"> </span><span class="tok-mi">0</span><span class="tok-p">;</span>
<span class="tok-p">}</span>
</pre></div></td></tr></table></div></code></pre>
</div>
</div>
<div class="paragraph">
<p>It is pretty self explanatory. You have to include stdio.h so you can use the
function printf (though in the real world I’d use puts here), the function main
is the start of any C/C++ program, which is a function that returns
an int. We call printf to display the string "Hello World!\n" to the user and
then return 0 to exit. Returning 0 indicates success and there were no errors.</p>
</div>
<div class="paragraph">
<p>You can compile and run it in a linux/unix terminal as shown below. You
can substitute clang or another compiler for gcc if you want.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="console"><span></span><span class="tok-gp">$ </span>gcc<span class="tok-w"> </span>-o<span class="tok-w"> </span>hello<span class="tok-w"> </span>hello.c
<span class="tok-gp">$ </span>./hello
<span class="tok-go">Hello World!</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>Now, the same program in MIPS:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="mips"><div class="lineno"><table class="linenotable"><tr><td class="linenos"><div class="linenodiv"><pre><span class="normal"> 1</span>
<span class="normal"> 2</span>
<span class="normal"> 3</span>
<span class="normal"> 4</span>
<span class="normal"> 5</span>
<span class="normal"> 6</span>
<span class="normal"> 7</span>
<span class="normal"> 8</span>
<span class="normal"> 9</span>
<span class="normal">10</span>
<span class="normal">11</span></pre></div></td><td class="code"><div><pre><span></span><span class="tok-ni">.data</span>
<span class="tok-nf">hello:</span><span class="tok-w"> </span><span class="tok-ni">.asciiz</span><span class="tok-w"> </span><span class="tok-s">"Hello World!</span><span class="tok-se">\n</span><span class="tok-s">"</span>
<span class="tok-ni">.text</span>
<span class="tok-nf">main:</span>
<span class="tok-w"> </span><span class="tok-nv">li</span><span class="tok-w"> </span><span class="tok-kt">$v0</span><span class="tok-nb">,</span><span class="tok-w"> </span><span class="tok-kc">4</span><span class="tok-w"> </span><span class="tok-c"># load immediate, v0 = 4 (4 is print string system call)</span>
<span class="tok-w"> </span><span class="tok-nv">la</span><span class="tok-w"> </span><span class="tok-kt">$a0</span><span class="tok-nb">,</span><span class="tok-w"> </span>hello<span class="tok-w"> </span><span class="tok-c"># load address of string to print into a0</span>
<span class="tok-w"> </span><span class="tok-k">syscall</span>
<span class="tok-w"> </span><span class="tok-nv">li</span><span class="tok-w"> </span><span class="tok-kt">$v0</span><span class="tok-nb">,</span><span class="tok-w"> </span><span class="tok-kc">10</span><span class="tok-w"> </span><span class="tok-c"># exit syscall</span>
<span class="tok-w"> </span><span class="tok-k">syscall</span>
</pre></div></td></tr></table></div></code></pre>
</div>
</div>
<div class="paragraph">
<p>The <code>.data</code> section is where you declare global variables, which includes string
literals as in this case. We’ll cover them in more detail later.</p>
</div>
<div class="paragraph">
<p>The <code>.text</code> section is where any code goes. Here we declare a single label <code>main:</code>,
indicating the start of our main function.</p>
</div>
<div class="paragraph">
<p>We then put the number 4 in the <code>$v0</code> register to select the print string system
call. The print string system call takes one argument, the address of the string
to print, in the <code>$a0</code> register. We do that on the next line. On line 8, we call
the system call using the syscall instruction.</p>
</div>
<div class="paragraph">
<p>Finally we call the exit system call which takes no arguments and exits the program.</p>
</div>
<div class="paragraph">
<p>Again, we’ll cover system calls in a later chapter. This is just an intro/overview
so don’t worry if some things aren’t completely clear. This chapter is about getting
you up and running, not really about teaching anything specific yet.</p>
</div>
</div>
<div class="sect2">
<h3 id="_building_and_running">Building and Running</h3>
<div class="paragraph">
<p>Now that we have our hello world MIPS program, how do we run it? Well the easiest
and quickest<sup class="footnote">[<a id="_footnoteref_1" class="footnote" href="#_footnotedef_1" title="View footnote.">1</a>]</sup> way is of course to do it on the command line, which can be done like
this for spim:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="console"><span></span><span class="tok-gp">$ </span>spim<span class="tok-w"> </span>-file<span class="tok-w"> </span>hello.s
<span class="tok-go">SPIM Version 8.0 of January 8, 2010</span>
<span class="tok-go">Copyright 1990-2010, James R. Larus.</span>
<span class="tok-go">All Rights Reserved.</span>
<span class="tok-go">See the file README for a full copyright notice.</span>
<span class="tok-go">Loaded: /usr/lib/spim/exceptions.s</span>
<span class="tok-go">Hello World!</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>or this for MARS:</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="console"><span></span><span class="tok-gp">$ </span>java<span class="tok-w"> </span>-jar<span class="tok-w"> </span>~/Mars4_5.jar<span class="tok-w"> </span>hello.s
<span class="tok-go">MARS 4.5 Copyright 2003-2014 Pete Sanderson and Kenneth Vollmar</span>
<span class="tok-go">Hello World!</span></code></pre>
</div>
</div>
<div class="paragraph">
<p>The name of your MARS jar file may be different<sup class="footnote">[<a id="_footnoteref_2" class="footnote" href="#_footnotedef_2" title="View footnote.">2</a>]</sup>, so be sure to
use the correct name and path. For myself, I keep the jar file in my home
directory so I can use tilde to access it no matter where I am. You can also
copy it into your working directory (ie wherever you have your source code) so you
don’t have to specify a path at all. There are lots of useful command line options
that you can use<sup class="footnote">[<a id="_footnoteref_3" class="footnote" href="#_footnotedef_3" title="View footnote.">3</a>]</sup>, some of which we’ll touch on later.</p>
</div>
<div class="paragraph">
<p>Running the jar directly on the command line works even in the DOS command line though
I’ve never done it and it’s probably not worth it.</p>
</div>
<div class="paragraph">
<p>Alternatively, you can start up MARS or QtSpim like a normal GUI application and
then load your source file. MARS requires you to hit "assemble" and then "run".
Whereas with QtSpim you only have to hit "run".</p>
</div>
<div class="paragraph">
<p>QtSpim does let you start and load the file in one step from the command line</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="console"><span></span><span class="tok-gp">$ </span>qtspim<span class="tok-w"> </span>hello.s</code></pre>
</div>
</div>
<div class="paragraph">
<p>but there is no way to simply run it with out starting the GUI, which makes sense
since the whole point is to be a GUI wrapper around spim.</p>
</div>
</div>
<div class="sect2">
<h3 id="_conclusion">Conclusion</h3>
<div class="paragraph">
<p>Well, there you have it, you have written and run your first MIPS program. Another
few chapters and you will have no trouble with almost anything you would want
to do in MIPS, whether for a class, or on your own for fun.</p>
</div>
</div>
<div class="sect2">
<h3 id="_exercises">Exercises</h3>
<div class="paragraph">
<p>You can support the book and purchase the chapter exercise solutions
<a href="https://store.robertwinkler.com/">here</a>.</p>
</div>
<div class="olist arabic">
<ol class="arabic">
<li>
<p>Modify the hello world program to print something different, perhaps your name.</p>
</li>
<li>
<p>Run it with both SPIM and MARS.</p>
</li>
</ol>
</div>
<div class="paragraph">
<p>purposes of learning and actually using assembly directly, there’s no reason to make your life
harder than necessary.]</p>