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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment">## read a character from stdin, save it to a global, write it to stdout</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run (from the subx directory):</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ subx translate examples/ex4.subx -o examples/ex4</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ subx run examples/ex4</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span>== code
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># syscall(read, stdin, X, 1)</span>
<span id="L10" class="LineNr">10 </span> <span class="subxComment"># fd = 0 (stdin)</span>
<span id="L11" class="LineNr">11 </span>bb/copy-to-EBX 0/imm32
<span id="L12" class="LineNr">12 </span> <span class="subxComment"># initialize X (location to write result to)</span>
<span id="L13" class="LineNr">13 </span>b9/copy-to-ECX <span class="Special">X</span>/imm32
<span id="L14" class="LineNr">14 </span> <span class="subxComment"># size = 1 character</span>
<span id="L15" class="LineNr">15 </span>ba/copy-to-EDX 1/imm32
<span id="L16" class="LineNr">16 </span> <span class="subxComment"># syscall</span>
<span id="L17" class="LineNr">17 </span>b8/copy-to-EAX 3/imm32/read
<span id="L18" class="LineNr">18 </span>cd/syscall 0x80/imm8
<span id="L19" class="LineNr">19 </span>
<span id="L20" class="LineNr">20 </span><span class="subxComment"># syscall(write, stdout, X, 1)</span>
<span id="L21" class="LineNr">21 </span> <span class="subxComment"># fd = 1 (stdout)</span>
<span id="L22" class="LineNr">22 </span>bb/copy-to-EBX 1/imm32
<span id="L23" class="LineNr">23 </span> <span class="subxComment"># initialize X (location to read from)</span>
<span id="L24" class="LineNr">24 </span>b9/copy-to-ECX <span class="Special">X</span>/imm32
<span id="L25" class="LineNr">25 </span> <span class="subxComment"># size = 1 character</span>
<span id="L26" class="LineNr">26 </span>ba/copy-to-EDX 1/imm32
<span id="L27" class="LineNr">27 </span> <span class="subxComment"># syscall</span>
<span id="L28" class="LineNr">28 </span>b8/copy-to-EAX 4/imm32/write
<span id="L29" class="LineNr">29 </span>cd/syscall 0x80/imm8
<span id="L30" class="LineNr">30 </span>
<span id="L31" class="LineNr">31 </span><span class="subxComment"># syscall(exit, EBX)</span>
<span id="L32" class="LineNr">32 </span>b8/copy-to-EAX 1/imm32/exit
<span id="L33" class="LineNr">33 </span>cd/syscall 0x80/imm8
<span id="L34" class="LineNr">34 </span>
<span id="L35" class="LineNr">35 </span>== data
<span id="L36" class="LineNr">36 </span>
<span id="L37" class="LineNr">37 </span><span class="Special">X</span>:
<span id="L38" class="LineNr">38 </span> 00 00 00 00 <span class="subxComment"># space for read() to write to</span>
<span id="L39" class="LineNr">39 </span>
<span id="L40" class="LineNr">40 </span><span class="subxComment"># vim:nowrap:textwidth=0</span>
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