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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->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) = &arr->data[arr->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 >= 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>= $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->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->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, "01 02 03 ", 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">"F - test-emit-hex-array"</span>/imm32
<span id="L129" class="LineNr">129 </span> 68/push <span class="Constant">"01 02 03 "</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:nowrap:textwidth=0</span>
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