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0001 <!DOCTYPE html> 0002 <html><head> 0003 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> 0004 <title>highlight.asm-mips</title> 0005 <meta name="generator" content="KF5::SyntaxHighlighting - Definition (MIPS Assembler) - Theme (Breeze Light)"/> 0006 </head><body style="background-color:#ffffff;color:#1f1c1b"><pre> 0007 <span style="color:#898887;"># A demonstration of some simple MIPS instructions</span> 0008 <span style="color:#898887;"># used to test QtSPIM</span> 0009 0010 <span style="color:#898887;"># Declare main as a global function</span> 0011 <span style="color:#0057ae;">.globl</span> main 0012 0013 <span style="color:#898887;"># All program code is placed after the</span> 0014 <span style="color:#898887;"># .text assembler directive</span> 0015 <span style="font-weight:bold;">.text</span> 0016 0017 <span style="color:#898887;"># The label 'main' represents the starting point</span> 0018 <span style="color:#006e28;">main:</span> 0019 <span style="color:#644a9b;">li</span> <span style="color:#0000ff;">$t2</span>, <span style="color:#b08000;">25</span> <span style="color:#898887;"># Load immediate value (25) </span> 0020 <span style="font-weight:bold;">lw</span> <span style="color:#0000ff;">$t3</span>, value <span style="color:#898887;"># Load the word stored in value (see bottom)</span> 0021 <span style="font-weight:bold;">add</span> <span style="color:#0000ff;">$t4</span>, <span style="color:#0000ff;">$t2</span>, <span style="color:#0000ff;">$t3</span> <span style="color:#898887;"># Add</span> 0022 <span style="font-weight:bold;">sub</span> <span style="color:#0000ff;">$t5</span>, <span style="color:#0000ff;">$t2</span>, <span style="color:#0000ff;">$t3</span> <span style="color:#898887;"># Subtract</span> 0023 <span style="font-weight:bold;">sw</span> <span style="color:#0000ff;">$t5</span>, Z <span style="color:#898887;">#Store the answer in Z (declared at the bottom) </span> 0024 0025 <span style="color:#898887;"># Exit the program by means of a syscall.</span> 0026 <span style="color:#898887;"># There are many syscalls - pick the desired one</span> 0027 <span style="color:#898887;"># by placing its code in $v0. The code for exit is "10"</span> 0028 <span style="color:#644a9b;">li</span> <span style="color:#0057ae;">$v0</span>, <span style="color:#b08000;">10</span> <span style="color:#898887;"># Sets $v0 to "10" to select exit syscall</span> 0029 <span style="font-weight:bold;">syscall</span> <span style="color:#898887;"># Exit</span> 0030 0031 <span style="color:#898887;"># All memory structures are placed after the</span> 0032 <span style="color:#898887;"># .data assembler directive</span> 0033 <span style="font-weight:bold;">.data</span> 0034 0035 <span style="color:#898887;"># The .word assembler directive reserves space</span> 0036 <span style="color:#898887;"># in memory for a single 4-byte word (or multiple 4-byte words)</span> 0037 <span style="color:#898887;"># and assigns that memory location an initial value</span> 0038 <span style="color:#898887;"># (or a comma separated list of initial values)</span> 0039 <span style="color:#006e28;">value:</span> <span style="color:#0057ae;">.word</span> <span style="color:#b08000;">12</span> 0040 <span style="color:#006e28;">Z:</span> <span style="color:#0057ae;">.word</span> <span style="color:#b08000;">0</span> 0041 </pre></body></html>