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<a href='https://github.com/akkartik/mu/blob/master/subx/065error-byte.subx'>https://github.com/akkartik/mu/blob/master/subx/065error-byte.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Print an error message followed by the text representation of a byte. Then 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> <span class="subxComment"># manual test</span>
<span id="L10" class="LineNr"> 10 </span><span class="CommentedCode">#? # . var ed/EAX : exit-descriptor</span>
<span id="L11" class="LineNr"> 11 </span><span class="CommentedCode">#? 81 5/subop/subtract 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # subtract from ESP</span>
<span id="L12" class="LineNr"> 12 </span><span class="CommentedCode">#? 89/copy 3/mod/direct 0/rm32/EAX . . . 4/r32/ESP . . # copy ESP to EAX</span>
<span id="L13" class="LineNr"> 13 </span><span class="CommentedCode">#? # . configure ed to really exit()</span>
<span id="L14" class="LineNr"> 14 </span><span class="CommentedCode">#? # . . ed->target = 0</span>
<span id="L15" class="LineNr"> 15 </span><span class="CommentedCode">#? c7 0/subop/copy 0/mod/direct 0/rm32/EAX . . . . . 0/imm32 # copy to *EAX</span>
<span id="L16" class="LineNr"> 16 </span><span class="CommentedCode">#? # . error-byte(ed, Stdout, msg, 34)</span>
<span id="L17" class="LineNr"> 17 </span><span class="CommentedCode">#? 68/push 0x34/imm32</span>
<span id="L18" class="LineNr"> 18 </span><span class="CommentedCode">#? 68/push "abc"/imm32</span>
<span id="L19" class="LineNr"> 19 </span><span class="CommentedCode">#? 68/push Stderr/imm32</span>
<span id="L20" class="LineNr"> 20 </span><span class="CommentedCode">#? 50/push-EAX</span>
<span id="L21" class="LineNr"> 21 </span><span class="CommentedCode">#? e8/call error-byte/disp32</span>
<span id="L22" class="LineNr"> 22 </span> <span class="subxComment"># automatic test</span>
<span id="L23" class="LineNr"> 23 </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="L24" class="LineNr"> 24 </span> <span class="subxS1Comment"># . syscall(exit, Num-test-failures)</span>
<span id="L25" class="LineNr"> 25 </span> 8b/copy 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/EBX <span class="SpecialChar"><a href='051test.subx.html#L87'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to EBX</span>
<span id="L26" class="LineNr"> 26 </span> b8/copy-to-EAX 1/imm32/exit
<span id="L27" class="LineNr"> 27 </span> cd/syscall 0x80/imm8
<span id="L28" class="LineNr"> 28 </span>
<span id="L29" class="LineNr"> 29 </span><span class="subxComment"># write(out, "Error: "+msg+": "+byte) then stop(ed, 1)</span>
<span id="L30" class="LineNr"> 30 </span><span class="subxFunction"><a href='065error-byte.subx.html#L30'>error-byte</a></span>: <span class="subxComment"># ed : (address exit-descriptor), out : (address buffered-file), msg : (address array byte), n : byte -> <void></span>
<span id="L31" class="LineNr"> 31 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L32" class="LineNr"> 32 </span> 55/push-EBP
<span id="L33" class="LineNr"> 33 </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="L34" class="LineNr"> 34 </span> <span class="subxComment"># write-buffered(out, "Error: ")</span>
<span id="L35" class="LineNr"> 35 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L36" class="LineNr"> 36 </span> 68/push <span class="Constant">"Error: "</span>/imm32
<span id="L37" class="LineNr"> 37 </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="L38" class="LineNr"> 38 </span> <span class="subxS2Comment"># . . call</span>
<span id="L39" class="LineNr"> 39 </span> e8/call <a href='064write-buffered.subx.html#L17'>write-buffered</a>/disp32
<span id="L40" class="LineNr"> 40 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L41" class="LineNr"> 41 </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="L42" class="LineNr"> 42 </span> <span class="subxComment"># write-buffered(out, msg)</span>
<span id="L43" class="LineNr"> 43 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L44" class="LineNr"> 44 </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> 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(EBP+16)</span>
<span id="L45" class="LineNr"> 45 </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="L46" class="LineNr"> 46 </span> <span class="subxS2Comment"># . . call</span>
<span id="L47" class="LineNr"> 47 </span> e8/call <a href='064write-buffered.subx.html#L17'>write-buffered</a>/disp32
<span id="L48" class="LineNr"> 48 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L49" class="LineNr"> 49 </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="L50" class="LineNr"> 50 </span> <span class="subxComment"># write-buffered(out, ": ")</span>
<span id="L51" class="LineNr"> 51 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L52" class="LineNr"> 52 </span> 68/push <span class="Constant">": "</span>/imm32
<span id="L53" class="LineNr"> 53 </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="L54" class="LineNr"> 54 </span> <span class="subxS2Comment"># . . call</span>
<span id="L55" class="LineNr"> 55 </span> e8/call <a href='064write-buffered.subx.html#L17'>write-buffered</a>/disp32
<span id="L56" class="LineNr"> 56 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L57" class="LineNr"> 57 </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="L58" class="LineNr"> 58 </span> <span class="subxComment"># print-byte(out, byte)</span>
<span id="L59" class="LineNr"> 59 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L60" class="LineNr"> 60 </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> 0x14/disp8 <span class="Normal"> . </span> <span class="subxComment"># push *(EBP+20)</span>
<span id="L61" class="LineNr"> 61 </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="L62" class="LineNr"> 62 </span> <span class="subxS2Comment"># . . call</span>
<span id="L63" class="LineNr"> 63 </span> e8/call <a href='063print-byte.subx.html#L15'>print-byte</a>/disp32
<span id="L64" class="LineNr"> 64 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L65" class="LineNr"> 65 </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="L66" class="LineNr"> 66 </span> <span class="subxComment"># write-buffered(out, Newline)</span>
<span id="L67" class="LineNr"> 67 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L68" class="LineNr"> 68 </span> 68/push <span class="SpecialChar"><a href='051test.subx.html#L81'>Newline</a></span>/imm32
<span id="L69" class="LineNr"> 69 </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="L70" class="LineNr"> 70 </span> <span class="subxS2Comment"># . . call</span>
<span id="L71" class="LineNr"> 71 </span> e8/call <a href='064write-buffered.subx.html#L17'>write-buffered</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> 8/imm32 <span class="subxComment"># add to ESP</span>
<span id="L74" class="LineNr"> 74 </span> <span class="subxS1Comment"># . flush(out)</span>
<span id="L75" class="LineNr"> 75 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L76" class="LineNr"> 76 </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="L77" class="LineNr"> 77 </span> <span class="subxS2Comment"># . . call</span>
<span id="L78" class="LineNr"> 78 </span> e8/call <a href='062write-byte.subx.html#L84'>flush</a>/disp32
<span id="L79" class="LineNr"> 79 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L80" class="LineNr"> 80 </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="L81" class="LineNr"> 81 </span> <span class="subxComment"># stop(ed, 1)</span>
<span id="L82" class="LineNr"> 82 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L83" class="LineNr"> 83 </span> 68/push 1/imm32
<span id="L84" class="LineNr"> 84 </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="L85" class="LineNr"> 85 </span> <span class="subxS2Comment"># . . call</span>
<span id="L86" class="LineNr"> 86 </span> e8/call <a href='057stop.subx.html#L99'>stop</a>/disp32
<span id="L87" class="LineNr"> 87 </span> <span class="subxComment"># should never get past this point</span>
<span id="L88" class="LineNr"> 88 </span><span class="Constant">$error-byte:dead-end</span>:
<span id="L89" class="LineNr"> 89 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L90" class="LineNr"> 90 </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="L91" class="LineNr"> 91 </span> 5d/pop-to-EBP
<span id="L92" class="LineNr"> 92 </span> c3/return
<span id="L93" class="LineNr"> 93 </span>
<span id="L94" class="LineNr"> 94 </span>== data
<span id="L95" class="LineNr"> 95 </span>
<span id="L96" class="LineNr"> 96 </span><span class="subxComment"># The buffered file for standard error.</span>
<span id="L97" class="LineNr"> 97 </span><span class="SpecialChar"><a href='065error-byte.subx.html#L97'>Stderr</a></span>:
<span id="L98" class="LineNr"> 98 </span> <span class="subxComment"># file descriptor or (address stream)</span>
<span id="L99" class="LineNr"> 99 </span> 02 00 00 00 <span class="subxComment"># 1 = standard error</span>
<span id="L100" class="LineNr">100 </span> <span class="subxComment"># current write index</span>
<span id="L101" class="LineNr">101 </span> 00 00 00 00
<span id="L102" class="LineNr">102 </span> <span class="subxComment"># current read index</span>
<span id="L103" class="LineNr">103 </span> 00 00 00 00
<span id="L104" class="LineNr">104 </span> <span class="subxComment"># length (8)</span>
<span id="L105" class="LineNr">105 </span> 08 00 00 00
<span id="L106" class="LineNr">106 </span> <span class="subxComment"># data</span>
<span id="L107" class="LineNr">107 </span> 00 00 00 00 00 00 00 00 <span class="subxComment"># 8 bytes</span>
<span id="L108" class="LineNr">108 </span>
<span id="L109" class="LineNr">109 </span><span class="subxComment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But</span>
<span id="L110" class="LineNr">110 </span><span class="subxComment"># I don't want to type in 1024 bytes here.</span>
<span id="L111" class="LineNr">111 </span>
<span id="L112" class="LineNr">112 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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