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<a href='https://github.com/akkartik/mu/blob/main/linux/134emit-hex-array.subx'>https://github.com/akkartik/mu/blob/main/linux/134emit-hex-array.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr">  1 </span>== code
<span id="L2" class="LineNr">  2 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L3" class="LineNr">  3 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L4" class="LineNr">  4 </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="L5" class="LineNr">  5 </span>
<span id="L6" class="LineNr">  6 </span><span class="subxComment"># print 'arr' in hex with a space after every byte</span>
<span id="L7" class="LineNr">  7 </span><span class="subxFunction">emit-hex-array</span>:  <span class="subxComment"># out: (addr buffered-file), arr: (addr array byte)</span>
<span id="L8" class="LineNr">  8 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L9" class="LineNr">  9 </span>    55/push-ebp
<span id="L10" class="LineNr"> 10 </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="L11" class="LineNr"> 11 </span>    <span class="subxS1Comment"># . save registers</span>
<span id="L12" class="LineNr"> 12 </span>    50/push-eax
<span id="L13" class="LineNr"> 13 </span>    51/push-ecx
<span id="L14" class="LineNr"> 14 </span>    52/push-edx
<span id="L15" class="LineNr"> 15 </span>    57/push-edi
<span id="L16" class="LineNr"> 16 </span>    <span class="subxComment"># edi = out</span>
<span id="L17" class="LineNr"> 17 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          7/r32/edi   8/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+8) to edi</span>
<span id="L18" class="LineNr"> 18 </span>    <span class="subxComment"># edx = arr</span>
<span id="L19" class="LineNr"> 19 </span>    8b/copy                         1/mod/*+disp8   5/rm32/ebp   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx   0xc/disp8      <span class="Normal"> . </span>                <span class="subxComment"># copy *(ebp+12) to edx</span>
<span id="L20" class="LineNr"> 20 </span>    <span class="subxComment"># var curr/ecx: (addr byte) = arr-&gt;data</span>
<span id="L21" class="LineNr"> 21 </span>    8d/copy-address                 1/mod/*+disp8   2/rm32/edx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx   4/disp8        <span class="Normal"> . </span>                <span class="subxComment"># copy edx+4 to ecx</span>
<span id="L22" class="LineNr"> 22 </span>    <span class="subxComment"># var max/edx: (addr byte) = &amp;arr-&gt;data[arr-&gt;size]</span>
<span id="L23" class="LineNr"> 23 </span>    8b/copy                         0/mod/indirect  2/rm32/edx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy *edx to edx</span>
<span id="L24" class="LineNr"> 24 </span>    01/add                          3/mod/direct    2/rm32/edx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          1/r32/ecx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># add ecx to edx</span>
<span id="L25" class="LineNr"> 25 </span>    <span class="subxComment"># var c/eax: byte = 0</span>
<span id="L26" class="LineNr"> 26 </span>    31/xor                          3/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/eax  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># clear eax</span>
<span id="L27" class="LineNr"> 27 </span><span class="Constant">$emit-hex-array:loop</span>:
<span id="L28" class="LineNr"> 28 </span>    <span class="subxComment"># if (curr &gt;= width) break</span>
<span id="L29" class="LineNr"> 29 </span>    39/compare                      3/mod/direct    1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          2/r32/edx  <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># compare ecx with edx</span>
<span id="L30" class="LineNr"> 30 </span>    73/jump-if-addr&gt;=  $emit-hex-array:end/disp8
<span id="L31" class="LineNr"> 31 </span>    <span class="subxComment"># emit-hex(out, c = *curr, width=1)</span>
<span id="L32" class="LineNr"> 32 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L33" class="LineNr"> 33 </span>    68/push  1/imm32/width
<span id="L34" class="LineNr"> 34 </span>    8a/copy-byte                    0/mod/indirect  1/rm32/ecx   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>          0/r32/AL   <span class="Normal"> . </span>             <span class="Normal"> . </span>                <span class="subxComment"># copy byte at *ecx to AL</span>
<span id="L35" class="LineNr"> 35 </span>    50/push-eax
<span id="L36" class="LineNr"> 36 </span>    57/push-edi
<span id="L37" class="LineNr"> 37 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L38" class="LineNr"> 38 </span>    e8/call  <a href='129emit-hex.subx.html#L7'>emit-hex</a>/disp32
<span id="L39" class="LineNr"> 39 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L40" class="LineNr"> 40 </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="L41" class="LineNr"> 41 </span>    <span class="subxComment"># ++curr</span>
<span id="L42" class="LineNr"> 42 </span>    41/increment-ecx
<span id="L43" class="LineNr"> 43 </span>    eb/jump  $emit-hex-array:<span class="Constant">loop</span>/disp8
<span id="L44" class="LineNr"> 44 </span><span class="Constant">$emit-hex-array:end</span>:
<span id="L45" class="LineNr"> 45 </span>    <span class="subxS1Comment"># . restore registers</span>
<span id="L46" class="LineNr"> 46 </span>    5f/pop-to-edi
<span id="L47" class="LineNr"> 47 </span>    5a/pop-to-edx
<span id="L48" class="LineNr"> 48 </span>    59/pop-to-ecx
<span id="L49" class="LineNr"> 49 </span>    58/pop-to-eax
<span id="L50" class="LineNr"> 50 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L51" class="LineNr"> 51 </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="L52" class="LineNr"> 52 </span>    5d/pop-to-ebp
<span id="L53" class="LineNr"> 53 </span>    c3/return
<span id="L54" class="LineNr"> 54 </span>
<span id="L55" class="LineNr"> 55 </span><span class="subxTest">test-emit-hex-array</span>:
<span id="L56" class="LineNr"> 56 </span>    <span class="subxS1Comment"># . prologue</span>
<span id="L57" class="LineNr"> 57 </span>    55/push-ebp
<span id="L58" class="LineNr"> 58 </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="L59" class="LineNr"> 59 </span>    <span class="subxComment"># setup</span>
<span id="L60" class="LineNr"> 60 </span>    <span class="subxS1Comment"># . clear-stream(_test-output-stream)</span>
<span id="L61" class="LineNr"> 61 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L62" class="LineNr"> 62 </span>    68/push  <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L63" class="LineNr"> 63 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L64" class="LineNr"> 64 </span>    e8/call  <a href='106stream.subx.html#L17'>clear-stream</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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L67" class="LineNr"> 67 </span>    <span class="subxS1Comment"># . clear-stream($_test-output-buffered-file-&gt;buffer)</span>
<span id="L68" class="LineNr"> 68 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L69" class="LineNr"> 69 </span>    68/push  $_test-output-buffered-file-&gt;buffer/imm32
<span id="L70" class="LineNr"> 70 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L71" class="LineNr"> 71 </span>    e8/call  <a href='106stream.subx.html#L17'>clear-stream</a>/disp32
<span id="L72" class="LineNr"> 72 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L73" class="LineNr"> 73 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L74" class="LineNr"> 74 </span>    <span class="subxComment"># var arr/ecx (array byte) = [01, 02, 03]</span>
<span id="L75" class="LineNr"> 75 </span>    68/push  0x00030201/imm32  <span class="subxComment"># bytes 01 02 03</span>
<span id="L76" class="LineNr"> 76 </span>    68/push  3/imm32/size
<span id="L77" class="LineNr"> 77 </span>    89/copy                         3/mod/direct    1/rm32/ecx   <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 ecx</span>
<span id="L78" class="LineNr"> 78 </span>    <span class="subxComment"># emit-hex-array(_test-output-buffered-file, arr)</span>
<span id="L79" class="LineNr"> 79 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L80" class="LineNr"> 80 </span>    51/push-ecx
<span id="L81" class="LineNr"> 81 </span>    68/push  <a href='115write-byte.subx.html#L425'>_test-output-buffered-file</a>/imm32
<span id="L82" class="LineNr"> 82 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L83" class="LineNr"> 83 </span>    e8/call  <a href='134emit-hex-array.subx.html#L7'>emit-hex-array</a>/disp32
<span id="L84" class="LineNr"> 84 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L85" class="LineNr"> 85 </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="L86" class="LineNr"> 86 </span>    <span class="subxS1Comment"># . flush(_test-output-buffered-file)</span>
<span id="L87" class="LineNr"> 87 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L88" class="LineNr"> 88 </span>    68/push  <a href='115write-byte.subx.html#L425'>_test-output-buffered-file</a>/imm32
<span id="L89" class="LineNr"> 89 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L90" class="LineNr"> 90 </span>    e8/call  <a href='115write-byte.subx.html#L81'>flush</a>/disp32
<span id="L91" class="LineNr"> 91 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L92" class="LineNr"> 92 </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>              4/imm32           <span class="subxComment"># add to esp</span>
<span id="L93" class="Folded"> 93 </span><span class="Folded">+-- 33 lines: #?     # dump output -----------------------------------------------------------------------------------------------------------------------------------------</span>
<span id="L126" class="LineNr">126 </span>    <span class="subxComment"># check-next-stream-line-equal(_test-output-stream, &quot;01 02 03 &quot;, msg)</span>
<span id="L127" class="LineNr">127 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L128" class="LineNr">128 </span>    68/push  <span class="Constant">&quot;F - test-emit-hex-array&quot;</span>/imm32
<span id="L129" class="LineNr">129 </span>    68/push  <span class="Constant">&quot;01 02 03 &quot;</span>/imm32
<span id="L130" class="LineNr">130 </span>    68/push  <a href='115write-byte.subx.html#L287'>_test-output-stream</a>/imm32
<span id="L131" class="LineNr">131 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L132" class="LineNr">132 </span>    e8/call  <a href='109stream-equal.subx.html#L565'>check-next-stream-line-equal</a>/disp32
<span id="L133" class="LineNr">133 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L134" class="LineNr">134 </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="L135" class="LineNr">135 </span>    <span class="subxS1Comment"># . epilogue</span>
<span id="L136" class="LineNr">136 </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="L137" class="LineNr">137 </span>    5d/pop-to-ebp
<span id="L138" class="LineNr">138 </span>    c3/return
<span id="L139" class="LineNr">139 </span>
<span id="L140" class="LineNr">140 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
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