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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## read a character from stdin, save it to a local on the stack, write it to stdout</span>
<span id="L2" class="LineNr"> 2 </span><span class="Comment">#</span>
<span id="L3" class="LineNr"> 3 </span><span class="Comment"># To run:</span>
<span id="L4" class="LineNr"> 4 </span><span class="Comment"># $ subx translate ex5.subx ex5</span>
<span id="L5" class="LineNr"> 5 </span><span class="Comment"># $ subx run ex5</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span>== code
<span id="L8" class="LineNr"> 8 </span><span class="Comment"># instruction effective address operand displacement immediate</span>
<span id="L9" class="LineNr"> 9 </span><span class="Comment"># op subop mod rm32 base index scale r32</span>
<span id="L10" class="LineNr">10 </span><span class="Comment"># 1-3 bytes 3 bits 2 bits 3 bits 3 bits 3 bits 2 bits 2 bits 0/1/2/4 bytes 0/1/2/4 bytes</span>
<span id="L11" class="LineNr">11 </span>
<span id="L12" class="LineNr">12 </span><span class="SalientComment">## function main</span>
<span id="L13" class="LineNr">13 </span> <span class="Comment"># prolog</span>
<span id="L14" class="LineNr">14 </span> 55/push <span class="Comment"># push EBP</span>
<span id="L15" class="LineNr">15 </span> 89/copy 3/mod/direct 5/rm32/EBP 4/r32/ESP <span class="Comment"># copy ESP to EBP</span>
<span id="L16" class="LineNr">16 </span> <span class="Comment"># allocate x on the stack</span>
<span id="L17" class="LineNr">17 </span> 81 5/subop/subtract 3/mod/direct 4/rm32/ESP 4/imm32 <span class="Comment"># subtract 4 bytes from ESP</span>
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span> <span class="SalientComment">## read(stdin, x, 1)</span>
<span id="L20" class="LineNr">20 </span> <span class="Comment"># fd = 0 (stdin)</span>
<span id="L21" class="LineNr">21 </span> bb/copy 0/imm32 <span class="Comment"># copy 0 to EBX</span>
<span id="L22" class="LineNr">22 </span> <span class="Comment"># initialize x (location to write result to)</span>
<span id="L23" class="LineNr">23 </span> 89/copy 3/mod/direct 1/rm32/ECX 5/r32/EBP <span class="Comment"># copy EBP to ECX</span>
<span id="L24" class="LineNr">24 </span> <span class="Comment"># size = 1 character</span>
<span id="L25" class="LineNr">25 </span> ba/copy 1/imm32 <span class="Comment"># copy 1 to EDX</span>
<span id="L26" class="LineNr">26 </span> <span class="Comment"># read(fd, x, size)</span>
<span id="L27" class="LineNr">27 </span> b8/copy 3/imm32 <span class="Comment"># copy 3 to EAX</span>
<span id="L28" class="LineNr">28 </span> cd/syscall 0x80/imm8 <span class="Comment"># int 80h</span>
<span id="L29" class="LineNr">29 </span>
<span id="L30" class="LineNr">30 </span> <span class="SalientComment">## write(stdout, x, 1)</span>
<span id="L31" class="LineNr">31 </span> <span class="Comment"># fd = 1 (stdout)</span>
<span id="L32" class="LineNr">32 </span> bb/copy 1/imm32 <span class="Comment"># copy 1 to EBX</span>
<span id="L33" class="LineNr">33 </span> <span class="Comment"># initialize x (location to read from)</span>
<span id="L34" class="LineNr">34 </span> 89/copy 3/mod/direct 1/rm32/ECX 5/r32/EBP <span class="Comment"># copy EBP to ECX</span>
<span id="L35" class="LineNr">35 </span> <span class="Comment"># size = 1 character</span>
<span id="L36" class="LineNr">36 </span> ba/copy 1/imm32 <span class="Comment"># copy 1 to EDX</span>
<span id="L37" class="LineNr">37 </span> <span class="Comment"># write(fd, x, size)</span>
<span id="L38" class="LineNr">38 </span> b8/copy 4/imm32 <span class="Comment"># copy 4 to EAX</span>
<span id="L39" class="LineNr">39 </span> cd/syscall 0x80/imm8 <span class="Comment"># int 80h</span>
<span id="L40" class="LineNr">40 </span>
<span id="L41" class="LineNr">41 </span> <span class="SalientComment">## exit(EBX)</span>
<span id="L42" class="LineNr">42 </span> b8/copy 1/imm32 <span class="Comment"># copy 1 to EAX</span>
<span id="L43" class="LineNr">43 </span> cd/syscall 0x80/imm8 <span class="Comment"># int 80h</span>
<span id="L44" class="LineNr">44 </span>
<span id="L45" class="LineNr">45 </span><span class="Comment"># vim:ft=subx:nowrap</span>
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