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<a href='https://github.com/akkartik/mu/blob/main/baremetal/107trace.subx'>https://github.com/akkartik/mu/blob/main/baremetal/107trace.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L3" class="LineNr"> 3 </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="L4" class="LineNr"> 4 </span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># 3-argument variant of _append</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxMinorFunction">_append-3</span>: <span class="subxComment"># out: (addr byte), outend: (addr byte), s: (addr array byte) -> num_bytes_appended/eax</span>
<span id="L7" class="LineNr"> 7 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L8" class="LineNr"> 8 </span> 55/push-ebp
<span id="L9" class="LineNr"> 9 </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="L10" class="LineNr">10 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L11" class="LineNr">11 </span> 51/push-ecx
<span id="L12" class="LineNr">12 </span> <span class="subxComment"># eax = _append-4(out, outend, &s->data[0], &s->data[s->size])</span>
<span id="L13" class="LineNr">13 </span> <span class="subxS2Comment"># . . push &s->data[s->size]</span>
<span id="L14" class="LineNr">14 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/eax 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+16) to eax</span>
<span id="L15" class="LineNr">15 </span> 8b/copy 0/mod/indirect 0/rm32/eax <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"># copy *eax to ecx</span>
<span id="L16" class="LineNr">16 </span> 8d/copy-address 1/mod/*+disp8 4/rm32/sib 0/base/eax 1/index/ecx <span class="Normal"> . </span> 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy eax+ecx+4 to ecx</span>
<span id="L17" class="LineNr">17 </span> 51/push-ecx
<span id="L18" class="LineNr">18 </span> <span class="subxS2Comment"># . . push &s->data[0]</span>
<span id="L19" class="LineNr">19 </span> 8d/copy-address 1/mod/*+disp8 0/rm32/eax <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 eax+4 to ecx</span>
<span id="L20" class="LineNr">20 </span> 51/push-ecx
<span id="L21" class="LineNr">21 </span> <span class="subxS2Comment"># . . push outend</span>
<span id="L22" class="LineNr">22 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+12)</span>
<span id="L23" class="LineNr">23 </span> <span class="subxS2Comment"># . . push out</span>
<span id="L24" class="LineNr">24 </span> ff 6/subop/push 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(ebp+8)</span>
<span id="L25" class="LineNr">25 </span> <span class="subxS2Comment"># . . call</span>
<span id="L26" class="LineNr">26 </span> e8/call <a href='107trace.subx.html#L38'>_append-4</a>/disp32
<span id="L27" class="LineNr">27 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L28" class="LineNr">28 </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> 0x10/imm32 <span class="subxComment"># add to esp</span>
<span id="L29" class="LineNr">29 </span><span class="Constant">$_append-3:end</span>:
<span id="L30" class="LineNr">30 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L31" class="LineNr">31 </span> 59/pop-to-ecx
<span id="L32" class="LineNr">32 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L33" class="LineNr">33 </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="L34" class="LineNr">34 </span> 5d/pop-to-ebp
<span id="L35" class="LineNr">35 </span> c3/return
<span id="L36" class="LineNr">36 </span>
<span id="L37" class="LineNr">37 </span><span class="subxComment"># 4-argument variant of _append</span>
<span id="L38" class="LineNr">38 </span><span class="subxMinorFunction">_append-4</span>: <span class="subxComment"># out: (addr byte), outend: (addr byte), in: (addr byte), inend: (addr byte) -> num_bytes_appended/eax: int</span>
<span id="L39" class="LineNr">39 </span> <span class="subxS1Comment"># . prologue</span>
<span id="L40" class="LineNr">40 </span> 55/push-ebp
<span id="L41" class="LineNr">41 </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="L42" class="LineNr">42 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L43" class="LineNr">43 </span> 51/push-ecx
<span id="L44" class="LineNr">44 </span> 52/push-edx
<span id="L45" class="LineNr">45 </span> 53/push-ebx
<span id="L46" class="LineNr">46 </span> 56/push-esi
<span id="L47" class="LineNr">47 </span> 57/push-edi
<span id="L48" class="LineNr">48 </span> <span class="subxComment"># num_bytes_appended = 0</span>
<span id="L49" class="LineNr">49 </span> b8/copy-to-eax 0/imm32
<span id="L50" class="LineNr">50 </span> <span class="subxComment"># edi = out</span>
<span id="L51" class="LineNr">51 </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="L52" class="LineNr">52 </span> <span class="subxComment"># edx = outend</span>
<span id="L53" class="LineNr">53 </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="L54" class="LineNr">54 </span> <span class="subxComment"># esi = in</span>
<span id="L55" class="LineNr">55 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 6/r32/esi 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+16) to esi</span>
<span id="L56" class="LineNr">56 </span> <span class="subxComment"># ecx = inend</span>
<span id="L57" class="LineNr">57 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ecx 0x14/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+20) to ecx</span>
<span id="L58" class="LineNr">58 </span><span class="Constant">$_append-4:loop</span>:
<span id="L59" class="LineNr">59 </span> <span class="subxComment"># if (in >= inend) break</span>
<span id="L60" class="LineNr">60 </span> 39/compare 3/mod/direct 6/rm32/esi <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"># compare esi with ecx</span>
<span id="L61" class="LineNr">61 </span> 73/jump-if-addr>= $_append-4:end/disp8
<span id="L62" class="LineNr">62 </span> <span class="subxComment"># if (out >= outend) abort # just to catch test failures fast</span>
<span id="L63" class="LineNr">63 </span> 39/compare 3/mod/direct 7/rm32/edi <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 edi with edx</span>
<span id="L64" class="LineNr">64 </span> 73/jump-if-addr>= $_append-4:end/disp8 <span class="subxComment"># TODO: abort</span>
<span id="L65" class="LineNr">65 </span> <span class="subxComment"># *out = *in</span>
<span id="L66" class="LineNr">66 </span> 8a/copy-byte 0/mod/indirect 6/rm32/esi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/BL <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy byte at *esi to BL</span>
<span id="L67" class="LineNr">67 </span> 88/copy-byte 0/mod/indirect 7/rm32/edi <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/BL <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy byte at BL to *edi</span>
<span id="L68" class="LineNr">68 </span> <span class="subxComment"># ++num_bytes_appended</span>
<span id="L69" class="LineNr">69 </span> 40/increment-eax
<span id="L70" class="LineNr">70 </span> <span class="subxComment"># ++in</span>
<span id="L71" class="LineNr">71 </span> 46/increment-esi
<span id="L72" class="LineNr">72 </span> <span class="subxComment"># ++out</span>
<span id="L73" class="LineNr">73 </span> 47/increment-edi
<span id="L74" class="LineNr">74 </span> eb/jump $_append-4:<span class="Constant">loop</span>/disp8
<span id="L75" class="LineNr">75 </span><span class="Constant">$_append-4:end</span>:
<span id="L76" class="LineNr">76 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L77" class="LineNr">77 </span> 5f/pop-to-edi
<span id="L78" class="LineNr">78 </span> 5e/pop-to-esi
<span id="L79" class="LineNr">79 </span> 5b/pop-to-ebx
<span id="L80" class="LineNr">80 </span> 5a/pop-to-edx
<span id="L81" class="LineNr">81 </span> 59/pop-to-ecx
<span id="L82" class="LineNr">82 </span> <span class="subxS1Comment"># . epilogue</span>
<span id="L83" class="LineNr">83 </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="L84" class="LineNr">84 </span> 5d/pop-to-ebp
<span id="L85" class="LineNr">85 </span> c3/return
<span id="L86" class="LineNr">86 </span>
<span id="L87" class="LineNr">87 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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