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<a href='https://github.com/akkartik/mu/blob/master/subx/062write-byte.subx'>https://github.com/akkartik/mu/blob/master/subx/062write-byte.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># write-byte: write a single byte to a buffered-file. The write may be buffered.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># flush: write out any buffered writes to disk.</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># TODO: Come up with a way to signal failure to write to disk. This is hard</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># since the failure may impact previous calls that were buffered.</span>
<span id="L6" class="LineNr"> 6 </span>
<span id="L7" class="LineNr"> 7 </span>== data
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span><span class="subxComment"># The buffered file for standard output.</span>
<span id="L10" class="LineNr"> 10 </span><span class="SpecialChar"><a href='062write-byte.subx.html#L10'>Stdout</a></span>:
<span id="L11" class="LineNr"> 11 </span> <span class="subxComment"># file descriptor or (address stream)</span>
<span id="L12" class="LineNr"> 12 </span> 01 00 00 00 <span class="subxComment"># 1 = standard output</span>
<span id="L13" class="LineNr"> 13 </span> <span class="subxComment"># current write index</span>
<span id="L14" class="LineNr"> 14 </span> 00 00 00 00
<span id="L15" class="LineNr"> 15 </span> <span class="subxComment"># current read index</span>
<span id="L16" class="LineNr"> 16 </span> 00 00 00 00
<span id="L17" class="LineNr"> 17 </span> <span class="subxComment"># length (8)</span>
<span id="L18" class="LineNr"> 18 </span> 08 00 00 00
<span id="L19" class="LineNr"> 19 </span> <span class="subxComment"># data</span>
<span id="L20" class="LineNr"> 20 </span> 00 00 00 00 00 00 00 00 <span class="subxComment"># 8 bytes</span>
<span id="L21" class="LineNr"> 21 </span>
<span id="L22" class="LineNr"> 22 </span><span class="subxComment"># TODO: 8 bytes is too small. We'll need to grow the buffer for efficiency. But</span>
<span id="L23" class="LineNr"> 23 </span><span class="subxComment"># I don't want to type in 1024 bytes here.</span>
<span id="L24" class="LineNr"> 24 </span>
<span id="L25" class="LineNr"> 25 </span>== code
<span id="L26" class="LineNr"> 26 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
<span id="L27" class="LineNr"> 27 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
<span id="L28" class="LineNr"> 28 </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="L29" class="LineNr"> 29 </span>
<span id="L30" class="LineNr"> 30 </span><span class="subxComment"># main:</span>
<span id="L31" class="LineNr"> 31 </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="L32" class="LineNr"> 32 </span> <span class="subxComment"># syscall(exit, Num-test-failures)</span>
<span id="L33" class="LineNr"> 33 </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="L34" class="LineNr"> 34 </span> b8/copy-to-EAX 1/imm32/exit
<span id="L35" class="LineNr"> 35 </span> cd/syscall 0x80/imm8
<span id="L36" class="LineNr"> 36 </span>
<span id="L37" class="LineNr"> 37 </span><span class="subxComment"># Write lower byte of 'n' to 'f'.</span>
<span id="L38" class="LineNr"> 38 </span><span class="subxFunction"><a href='062write-byte.subx.html#L38'>write-byte</a></span>: <span class="subxComment"># f : (address buffered-file), n : int -> <void></span>
<span id="L39" class="LineNr"> 39 </span> <span class="subxS1Comment"># . prolog</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> 57/push-EDI
<span id="L45" class="LineNr"> 45 </span> <span class="subxComment"># EDI = f</span>
<span id="L46" class="LineNr"> 46 </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="L47" class="LineNr"> 47 </span> <span class="subxComment"># ECX = f->write</span>
<span id="L48" class="LineNr"> 48 </span> 8b/copy 1/mod/*+disp8 7/rm32/EDI <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 *(EDI+4) to ECX</span>
<span id="L49" class="LineNr"> 49 </span> <span class="subxComment"># if (f->write >= f->length) flush and clear f's stream</span>
<span id="L50" class="LineNr"> 50 </span> 3b/compare 1/mod/*+disp8 7/rm32/EDI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 1/r32/ECX 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># compare ECX with *(EDI+12)</span>
<span id="L51" class="LineNr"> 51 </span> 7c/jump-if-lesser $write-byte:to-stream/disp8
<span id="L52" class="LineNr"> 52 </span> <span class="subxS1Comment"># . flush(f)</span>
<span id="L53" class="LineNr"> 53 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L54" class="LineNr"> 54 </span> 57/push-EDI
<span id="L55" class="LineNr"> 55 </span> <span class="subxS2Comment"># . . call</span>
<span id="L56" class="LineNr"> 56 </span> e8/call <a href='062write-byte.subx.html#L84'>flush</a>/disp32
<span id="L57" class="LineNr"> 57 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L58" class="LineNr"> 58 </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="L59" class="LineNr"> 59 </span> <span class="subxS1Comment"># . clear-stream(stream = f+4)</span>
<span id="L60" class="LineNr"> 60 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L61" class="LineNr"> 61 </span> 8d/copy-address 1/mod/*+disp8 7/rm32/EDI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/EAX 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy EDI+4 to EAX</span>
<span id="L62" class="LineNr"> 62 </span> 50/push-EAX
<span id="L63" class="LineNr"> 63 </span> <span class="subxS2Comment"># . . call</span>
<span id="L64" class="LineNr"> 64 </span> e8/call <a href='056write.subx.html#L85'>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="Constant">$write-byte:to-stream</span>:
<span id="L68" class="LineNr"> 68 </span> <span class="subxComment"># write to stream</span>
<span id="L69" class="LineNr"> 69 </span> <span class="subxComment"># f->data[f->read] = LSB(n)</span>
<span id="L70" class="LineNr"> 70 </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="L71" class="LineNr"> 71 </span> 8a/copy-byte 1/mod/*+disp8 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/AL 0xc/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy byte at *(EBP+12) to AL</span>
<span id="L72" class="LineNr"> 72 </span> 88/copy-byte 1/mod/*+disp8 4/rm32/sib 7/base/EDI 1/index/ECX <span class="Normal"> . </span> 0/r32/AL 0x10/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy AL to *(EDI+ECX+16)</span>
<span id="L73" class="LineNr"> 73 </span> <span class="subxComment"># ++f->read</span>
<span id="L74" class="LineNr"> 74 </span> ff 0/subop/increment 1/mod/*+disp8 7/rm32/EDI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># increment *(EDI+4)</span>
<span id="L75" class="LineNr"> 75 </span><span class="Constant">$write-byte: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> 59/pop-to-ECX
<span id="L79" class="LineNr"> 79 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L80" class="LineNr"> 80 </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="L81" class="LineNr"> 81 </span> 5d/pop-to-EBP
<span id="L82" class="LineNr"> 82 </span> c3/return
<span id="L83" class="LineNr"> 83 </span>
<span id="L84" class="LineNr"> 84 </span><span class="subxFunction"><a href='062write-byte.subx.html#L84'>flush</a></span>: <span class="subxComment"># f : (address buffered-file) -> <void></span>
<span id="L85" class="LineNr"> 85 </span> <span class="subxS1Comment"># . prolog</span>
<span id="L86" class="LineNr"> 86 </span> 55/push-EBP
<span id="L87" class="LineNr"> 87 </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="L88" class="LineNr"> 88 </span> <span class="subxS1Comment"># . save registers</span>
<span id="L89" class="LineNr"> 89 </span> 50/push-EAX
<span id="L90" class="LineNr"> 90 </span> 51/push-ECX
<span id="L91" class="LineNr"> 91 </span> <span class="subxComment"># EAX = f</span>
<span id="L92" class="LineNr"> 92 </span> 8b/copy 1/mod/*+disp8 5/rm32/EBP <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/r32/EAX 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(EBP+8) to EAX</span>
<span id="L93" class="LineNr"> 93 </span> <span class="subxComment"># write-stream(f->fd, data = f+4)</span>
<span id="L94" class="LineNr"> 94 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L95" class="LineNr"> 95 </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="L96" class="LineNr"> 96 </span> 51/push-ECX
<span id="L97" class="LineNr"> 97 </span> ff 6/subop/push 0/mod/indirect 0/rm32/EAX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># push *EAX</span>
<span id="L98" class="LineNr"> 98 </span> <span class="subxS2Comment"># . . call</span>
<span id="L99" class="LineNr"> 99 </span> e8/call <a href='060write-stream.subx.html#L22'>write-stream</a>/disp32
<span id="L100" class="LineNr">100 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L101" class="LineNr">101 </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="L102" class="LineNr">102 </span><span class="Constant">$flush:end</span>:
<span id="L103" class="LineNr">103 </span> <span class="subxS1Comment"># . restore registers</span>
<span id="L104" class="LineNr">104 </span> 59/pop-to-ECX
<span id="L105" class="LineNr">105 </span> 58/pop-to-EAX
<span id="L106" class="LineNr">106 </span> <span class="subxS1Comment"># . epilog</span>
<span id="L107" class="LineNr">107 </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="L108" class="LineNr">108 </span> 5d/pop-to-EBP
<span id="L109" class="LineNr">109 </span> c3/return
<span id="L110" class="LineNr">110 </span>
<span id="L111" class="LineNr">111 </span><span class="subxH1Comment"># - tests</span>
<span id="L112" class="LineNr">112 </span>
<span id="L113" class="LineNr">113 </span><span class="subxTest"><a href='062write-byte.subx.html#L113'>test-write-byte-single</a></span>:
<span id="L114" class="LineNr">114 </span> <span class="subxH1Comment"># - check that read-byte returns first byte of 'file'</span>
<span id="L115" class="LineNr">115 </span> <span class="subxComment"># setup</span>
<span id="L116" class="LineNr">116 </span> <span class="subxS1Comment"># . clear-stream(_test-stream)</span>
<span id="L117" class="LineNr">117 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L118" class="LineNr">118 </span> 68/push <a href='056write.subx.html#L193'>_test-stream</a>/imm32
<span id="L119" class="LineNr">119 </span> <span class="subxS2Comment"># . . call</span>
<span id="L120" class="LineNr">120 </span> e8/call <a href='056write.subx.html#L85'>clear-stream</a>/disp32
<span id="L121" class="LineNr">121 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L122" class="LineNr">122 </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="L123" class="LineNr">123 </span> <span class="subxS1Comment"># . clear-stream(_test-buffered-file+4)</span>
<span id="L124" class="LineNr">124 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L125" class="LineNr">125 </span> b8/copy-to-EAX <a href='059read-byte.subx.html#L290'>_test-buffered-file</a>/imm32
<span id="L126" class="LineNr">126 </span> 05/add-to-EAX 4/imm32
<span id="L127" class="LineNr">127 </span> 50/push-EAX
<span id="L128" class="LineNr">128 </span> <span class="subxS2Comment"># . . call</span>
<span id="L129" class="LineNr">129 </span> e8/call <a href='056write.subx.html#L85'>clear-stream</a>/disp32
<span id="L130" class="LineNr">130 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L131" class="LineNr">131 </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="L132" class="LineNr">132 </span> <span class="subxComment"># write-byte(_test-buffered-file, 'A')</span>
<span id="L133" class="LineNr">133 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L134" class="LineNr">134 </span> 68/push 0x41/imm32
<span id="L135" class="LineNr">135 </span> 68/push <a href='059read-byte.subx.html#L290'>_test-buffered-file</a>/imm32
<span id="L136" class="LineNr">136 </span> <span class="subxS2Comment"># . . call</span>
<span id="L137" class="LineNr">137 </span> e8/call <a href='062write-byte.subx.html#L38'>write-byte</a>/disp32
<span id="L138" class="LineNr">138 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L139" class="LineNr">139 </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="L140" class="LineNr">140 </span> <span class="subxComment"># flush(_test-buffered-file)</span>
<span id="L141" class="LineNr">141 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L142" class="LineNr">142 </span> 68/push <a href='059read-byte.subx.html#L290'>_test-buffered-file</a>/imm32
<span id="L143" class="LineNr">143 </span> <span class="subxS2Comment"># . . call</span>
<span id="L144" class="LineNr">144 </span> e8/call <a href='062write-byte.subx.html#L84'>flush</a>/disp32
<span id="L145" class="LineNr">145 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L146" class="LineNr">146 </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="L147" class="LineNr">147 </span> <span class="subxComment"># check-ints-equal(*_test-stream->data, 'A', msg)</span>
<span id="L148" class="LineNr">148 </span> <span class="subxS2Comment"># . . push args</span>
<span id="L149" class="LineNr">149 </span> 68/push <span class="Constant">"F - test-write-byte-single"</span>/imm32
<span id="L150" class="LineNr">150 </span> 68/push 0x41/imm32
<span id="L151" class="LineNr">151 </span> <span class="subxS2Comment"># . . push *_test-stream->data</span>
<span id="L152" class="LineNr">152 </span> b8/copy-to-EAX <a href='056write.subx.html#L193'>_test-stream</a>/imm32
<span id="L153" class="LineNr">153 </span> ff 6/subop/push 1/mod/*+disp8 0/rm32/EAX <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 *(EAX+12)</span>
<span id="L154" class="LineNr">154 </span> <span class="subxS2Comment"># . . call</span>
<span id="L155" class="LineNr">155 </span> e8/call <a href='051test.subx.html#L24'>check-ints-equal</a>/disp32
<span id="L156" class="LineNr">156 </span> <span class="subxS2Comment"># . . discard args</span>
<span id="L157" class="LineNr">157 </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="L158" class="LineNr">158 </span> <span class="subxS1Comment"># . end</span>
<span id="L159" class="LineNr">159 </span> c3/return
<span id="L160" class="LineNr">160 </span>
<span id="L161" class="LineNr">161 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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