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3.1 KiB
HTML
60 lines
3.1 KiB
HTML
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<title>MARS 4.5 help contents
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<h3>MARS - Mips Assembly and Runtime Simulator</h3>
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<h4>Release 4.5</h4>
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<h4>August 2014</h4>
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<h4>Introduction</h4>
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MARS, the <b>M</b>ips <b>A</b>ssembly and <b>R</b>untime <b>S</b>imulator,
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will assemble and simulate the execution of MIPS assembly language programs.
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It can be used either from a command line or through its
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integrated development environment (IDE). MARS is written in Java and
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requires at least Release 1.5 of the J2SE Java Runtime Environment (JRE) to work.
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It is distributed as an executable JAR file.
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The MARS home page
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is
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<tt><b>http://www.cs.missouristate.edu/MARS/</b></tt>. This document is available for printing there.
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<p>As of Release 4.0, MARS assembles and simulates 155 basic instructions of the MIPS-32
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instruction set, approximately 370 pseudo-instructions or instruction variations, the 17 syscall functions
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mainly for console and file I/O defined by SPIM, and an additional 22 syscalls for other uses such as MIDI
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output, random number generation and more. These are listed in separate help tabs. It supports seven
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different memory addressing modes for load and store instructions: <tt>label</tt>, <tt>immed</tt>,
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<tt>label+immed</tt>, <tt>($reg)</tt>, <tt>label($reg)</tt>, <tt>immed($reg)</tt>, and <tt>label+immed($reg)</tt>, where <tt>immed</tt>
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is an integer up to 32 bits. A setting is available to disallow use of pseudo-instructions
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and extended instruction formats and memory addressing modes.
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<p>
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Our guiding reference in implementing the instruction set has been
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<i>Computer Organization and Design, Fourth Edition</i> by Patterson and Hennessy,
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Elsevier - Morgan Kaufmann, 2009. It summarizes the MIPS-32 instruction set
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and pseudo-instructions in Figures 3.24 and 3.25 on pages 279-281, with details
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provided in the text and in Appendix B. MARS Releases 3.2 and above implement all the instructions
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in Appendix B and those figures except the delay branches from the left column of Figure 3.25.
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It also implements all the system services (syscalls) and assembler directives
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documented in Appendix B.
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<p>The MARS IDE provides program editing and assembling but its real
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strength is its support for interactive debugging. The programmer can easily set and
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remove execution breakpoints or step through execution forward or backward (undo) while
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viewing and directly editing register and memory contents.
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<h4>Questions and Comments</h4>
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Send MARS questions and comments to
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Dr. Pete Sanderson at <tt>PSanderson@otterbein.edu</tt> or
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Dr. Ken Vollmar at <tt>KenVollmar@missouristate.edu</tt>.
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We will respond as quickly as we can but as teaching professors do not have as much time to work on
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this project as we would like during the school year. We presented papers
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on MARS at the 2005 CCSC:MW conference and the 2006 SIGCSE Technical Symposium. We presented
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a tutorial session on MARS at the 2007 CCSC:CP conference and the Tutorial handout is available
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from the MARS homepage.
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<p>
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<hr>
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<p>
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This document is available for printing on the MARS home page
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<tt><b>http://www.cs.missouristate.edu/MARS/</b></tt>.
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</body>
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