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* 7842 - new directory organizationKartik K. Agaram2021-03-0312-0/+3719
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<a href='https://github.com/akkartik/mu/blob/master/subx/061error.subx'>https://github.com/akkartik/mu/blob/master/subx/061error.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Print an error message and exit.</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="subxComment"># main:</span>
<span id="L9" class="LineNr"> 9 </span>    e8/call  run-tests/disp32  <span class="subxComment"># 'run-tests' is a function created automatically by SubX. It calls all functions that start with 'test-'.</span>
<span id="L10" class="LineNr">10 </span>    <span class="subxComment"># syscall(exit, Num-test-failures)</span>
<span id="L11" class="LineNr">11 </span>    8b/copy                         0/mod/indirect  5/rm32/.disp32           <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          3/r32/EBX   <span class="SpecialChar">Num-test-failures</span>/disp32          <span class="subxComment"># copy *Num-test-failures to EBX</span>
<span id="L12" class="LineNr">12 </span>    b8/copy-to-EAX  1/imm32
<span id="L13" class="LineNr">13 </span>    cd/syscall  0x80/imm8
<span id="L14" class="LineNr">14 </span>
<span id="L15" class="LineNr">15 </span><span class="subxComment"># write(out, &quot;Error: &quot;+msg+&quot;\n&quot;) then stop(ed, 1)</span>
<span id="L16" class="LineNr">16 </span><span class="subxFunction">error</span>:  <span class="subxComment"># ed : (address exit-descriptor), out : fd or (address stream), msg : (address array byte) -&gt; &lt;void&gt;</span>
<span id="L17" class="LineNr">17 </span>    <span class="subxS1Comment"># . prolog</span>
<span id="L18" class="LineNr">18 </span>    55/push-EBP
<span id="L19" class="LineNr">19 </span>    89/copy                         3/mod/direct    5/rm32/EBP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          4/r32/ESP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy ESP to EBP</span>
<span id="L20" class="LineNr">20 </span>    <span class="subxComment"># write(out, &quot;Error: &quot;)</span>
<span id="L21" class="LineNr">21 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L22" class="LineNr">22 </span>    68/push  <span class="Constant">&quot;Error: &quot;</span>/imm32
<span id="L23" class="LineNr">23 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+12)</span>
<span id="L24" class="LineNr">24 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L25" class="LineNr">25 </span>    e8/call  write/disp32
<span id="L26" class="LineNr">26 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L27" class="LineNr">27 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L28" class="LineNr">28 </span>    <span class="subxComment"># write(out, msg)</span>
<span id="L29" class="LineNr">29 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L30" class="LineNr">30 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0x10/disp8     <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+16)</span>
<span id="L31" class="LineNr">31 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+12)</span>
<span id="L32" class="LineNr">32 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L33" class="LineNr">33 </span>    e8/call  write/disp32
<span id="L34" class="LineNr">34 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L35" class="LineNr">35 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L36" class="LineNr">36 </span>    <span class="subxComment"># write(out, Newline)</span>
<span id="L37" class="LineNr">37 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L38" class="LineNr">38 </span>    68/push  <span class="SpecialChar">Newline</span>/imm32
<span id="L39" class="LineNr">39 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          0xc/disp8      <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+12)</span>
<span id="L40" class="LineNr">40 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L41" class="LineNr">41 </span>    e8/call  write/disp32
<span id="L42" class="LineNr">42 </span>    <span class="subxS2Comment"># . . discard args</span>
<span id="L43" class="LineNr">43 </span>    81          0/subop/add         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>              8/imm32           <span class="subxComment"># add to ESP</span>
<span id="L44" class="LineNr">44 </span>    <span class="subxComment"># stop(ed, 1)</span>
<span id="L45" class="LineNr">45 </span>    <span class="subxS2Comment"># . . push args</span>
<span id="L46" class="LineNr">46 </span>    68/push  1/imm32
<span id="L47" class="LineNr">47 </span>    ff          6/subop/push        1/mod/*+disp8   4/rm32/sib    5/base/EBP  4/index/none <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>          8/disp8        <span class="CommentedCode"> . </span>                <span class="subxComment"># push *(EBP+8)</span>
<span id="L48" class="LineNr">48 </span>    <span class="subxS2Comment"># . . call</span>
<span id="L49" class="LineNr">49 </span>    e8/call  stop/disp32
<span id="L50" class="LineNr">50 </span>    <span class="subxComment"># should never get past this point</span>
<span id="L51" class="LineNr">51 </span><span class="Constant">$error:dead-end</span>:
<span id="L52" class="LineNr">52 </span>    <span class="subxS1Comment"># . epilog</span>
<span id="L53" class="LineNr">53 </span>    89/copy                         3/mod/direct    4/rm32/ESP   <span class="CommentedCode"> . </span>         <span class="CommentedCode"> . </span>           <span class="CommentedCode"> . </span>          5/r32/EBP  <span class="CommentedCode"> . </span>             <span class="CommentedCode"> . </span>                <span class="subxComment"># copy EBP to ESP</span>
<span id="L54" class="LineNr">54 </span>    5d/pop-to-EBP
<span id="L55" class="LineNr">55 </span>    c3/return
<span id="L56" class="LineNr">56 </span>
<span id="L57" class="LineNr">57 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
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