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<a href='https://github.com/akkartik/mu/blob/master/051test.subx'>https://github.com/akkartik/mu/blob/master/051test.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Rudimentary test harness</span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span>== code
<span id="L4" class="LineNr"> 4 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxS1Comment"># . 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="L7" class="LineNr"> 7 </span>
<span id="L8" class="LineNr"> 8 </span><span class="SpecialChar">Entry</span>:  <span class="subxComment"># manual test</span>
<span id="L9" class="LineNr"> 9 </span>    <span class="subxComment"># check-ints-equal(34, 34)</span>
<span id="L10" class="LineNr">10 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L11" class="LineNr">11 </span>    68/push  <span class="Constant">&quot;error in check-ints-equal&quot;</span>/imm32
<span id="L12" class="LineNr">12 </span>    68/push  34/imm32
<span id="L13" class="LineNr">13 </span>    68/push  34/imm32
<span id="L14" class="LineNr">14 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L15" class="LineNr">15 </span>    e8/call  <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L16" class="LineNr">16 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L17" class="LineNr">17 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0xc/imm32         <span class="subxComment"># add to esp</span>
<span id="L18" class="LineNr">18 </span>    <span class="subxComment"># syscall(exit, 0)</span>
<span id="L19" class="LineNr">19 </span>    bb/copy-to-ebx  0/imm32
<span id="L20" class="LineNr">20 </span>    b8/copy-to-eax  1/imm32/exit
<span id="L21" class="LineNr">21 </span>    cd/syscall  0x80/imm8
<span id="L22" class="LineNr">22 </span>
<span id="L23" class="LineNr">23 </span><span class="subxComment"># print msg to stderr if a != b, otherwise print &quot;.&quot;</span>
<span id="L24" class="LineNr">24 </span><span class="subxFunction">check-ints-equal</span>:  <span class="subxComment"># (a : int, b : int, msg : (address array byte)) -&gt; &lt;void&gt;</span>
<span id="L25" class="LineNr">25 </span>    <span class="subxS1Comment"># . prolog</span>
<span id="L26" class="LineNr">26 </span>    55/push-ebp
<span id="L27" class="LineNr">27 </span>    89/copy                         3/mod/direct    5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          4/r32/esp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy esp to ebp</span>
<span id="L28" class="LineNr">28 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L29" class="LineNr">29 </span>    50/push-eax
<span id="L30" class="LineNr">30 </span>    51/push-ecx
<span id="L31" class="LineNr">31 </span>    53/push-ebx
<span id="L32" class="LineNr">32 </span>    <span class="subxComment"># load first 2 args into eax and ebx</span>
<span id="L33" class="LineNr">33 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to eax</span>
<span id="L34" class="LineNr">34 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to ebx</span>
<span id="L35" class="LineNr">35 </span>    <span class="subxComment"># if (eax == ebx) success</span>
<span id="L36" class="LineNr">36 </span>    39/compare                      3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          3/r32/ebx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare eax and ebx</span>
<span id="L37" class="LineNr">37 </span>    75/jump-if-unequal  $check-ints-equal:else/disp8
<span id="L38" class="LineNr">38 </span>    <span class="subxS1Comment"># . _write(2/stderr, '.')</span>
<span id="L39" class="LineNr">39 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L40" class="LineNr">40 </span>    68/push  <span class="Constant">&quot;.&quot;</span>/imm32
<span id="L41" class="LineNr">41 </span>    68/push  2/imm32/stderr
<span id="L42" class="LineNr">42 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L43" class="LineNr">43 </span>    e8/call  <a href='050_write.subx.html#L14'>_write</a>/disp32
<span id="L44" class="LineNr">44 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L45" class="LineNr">45 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L46" class="LineNr">46 </span>    <span class="subxS1Comment"># . return</span>
<span id="L47" class="LineNr">47 </span>    eb/jump  $check-ints-equal:end/disp8
<span id="L48" class="LineNr">48 </span>    <span class="subxComment"># otherwise print error message</span>
<span id="L49" class="LineNr">49 </span><span class="Constant">$check-ints-equal:else</span>:
<span id="L50" class="LineNr">50 </span>    <span class="subxS1Comment"># . _write(2/stderr, msg)</span>
<span id="L51" class="LineNr">51 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L52" class="LineNr">52 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   0x10/disp8     <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+16) to ecx</span>
<span id="L53" class="LineNr">53 </span>    51/push-ecx
<span id="L54" class="LineNr">54 </span>    68/push  2/imm32/stderr
<span id="L55" class="LineNr">55 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L56" class="LineNr">56 </span>    e8/call  <a href='050_write.subx.html#L14'>_write</a>/disp32
<span id="L57" class="LineNr">57 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L58" class="LineNr">58 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L59" class="LineNr">59 </span>    <span class="subxS1Comment"># . _write(2/stderr, Newline)</span>
<span id="L60" class="LineNr">60 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L61" class="LineNr">61 </span>    68/push  <span class="SpecialChar"><a href='051test.subx.html#L83'>Newline</a></span>/imm32
<span id="L62" class="LineNr">62 </span>    68/push  2/imm32/stderr
<span id="L63" class="LineNr">63 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L64" class="LineNr">64 </span>    e8/call  <a href='050_write.subx.html#L14'>_write</a>/disp32
<span id="L65" class="LineNr">65 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L66" class="LineNr">66 </span>    81          0/subop/add         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              8/imm32           <span class="subxComment"># add to esp</span>
<span id="L67" class="LineNr">67 </span>    <span class="subxComment"># increment Num-test-failures</span>
<span id="L68" class="LineNr">68 </span>    ff          0/subop/increment   0/mod/indirect  5/rm32/.disp32           <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>          <span class="SpecialChar"><a href='051test.subx.html#L90'>Num-test-failures</a></span>/disp32          <span class="subxComment"># increment *Num-test-failures</span>
<span id="L69" class="LineNr">69 </span><span class="Constant">$check-ints-equal:end</span>:
<span id="L70" class="LineNr">70 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L71" class="LineNr">71 </span>    5b/pop-to-ebx
<span id="L72" class="LineNr">72 </span>    59/pop-to-ecx
<span id="L73" class="LineNr">73 </span>    58/pop-to-eax
<span id="L74" class="LineNr">74 </span>    <span class="subxS1Comment"># . epilog</span>
<span id="L75" class="LineNr">75 </span>    89/copy                         3/mod/direct    4/rm32/esp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          5/r32/ebp  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy ebp to esp</span>
<span id="L76" class="LineNr">76 </span>    5d/pop-to-ebp
<span id="L77" class="LineNr">77 </span>    c3/return
<span id="L78" class="LineNr">78 </span>
<span id="L79" class="LineNr">79 </span>== data
<span id="L80" class="LineNr">80 </span>
<span id="L81" class="LineNr">81 </span><span class="subxComment"># length-prefixed string containing just a single newline</span>
<span id="L82" class="LineNr">82 </span><span class="subxComment"># convenient to have when printing messages and so on</span>
<span id="L83" class="LineNr">83 </span><span class="SpecialChar">Newline</span>:
<span id="L84" class="LineNr">84 </span>    <span class="subxComment"># size</span>
<span id="L85" class="LineNr">85 </span>    1/imm32
<span id="L86" class="LineNr">86 </span>    <span class="subxComment"># data</span>
<span id="L87" class="LineNr">87 </span>    0a/newline
<span id="L88" class="LineNr">88 </span>
<span id="L89" class="LineNr">89 </span><span class="subxComment"># every test failure increments this counter</span>
<span id="L90" class="LineNr">90 </span><span class="SpecialChar">Num-test-failures</span>:
<span id="L91" class="LineNr">91 </span>    0/imm32
<span id="L92" class="LineNr">92 </span>
<span id="L93" class="LineNr">93 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
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