mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

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	Commit message (Expand)	Author	Age	Files	Lines
*	3642	Kartik K. Agaram	2016-11-06	1	-28/+28
*	3561	Kartik K. Agaram	2016-10-22	1	-1/+1
*	3558	Kartik K. Agaram	2016-10-22	1	-3/+3
*	3544	Kartik K. Agaram	2016-10-22	1	-1/+1
*	3543	Kartik K. Agaram	2016-10-22	1	-1/+11
*	3524	Kartik K. Agaram	2016-10-20	1	-19/+24
*	3431	Kartik K. Agaram	2016-09-30	1	-45/+47
*	3395	Kartik K. Agaram	2016-09-17	1	-68/+83
*	3355	Kartik K. Agaram	2016-09-15	1	-21/+48
*	3315	Kartik K. Agaram	2016-09-10	1	-68/+234
*	3158	Kartik K. Agaram	2016-07-27	1	-10/+16
*	3117	Kartik K. Agaram	2016-07-20	1	-2/+0
*	3102	Kartik K. Agaram	2016-07-05	1	-4/+19
*	2996	Kartik K. Agaram	2016-05-21	1	-289/+232
*	2875	Kartik K. Agaram	2016-04-27	1	-1/+1
*	2866	Kartik K. Agaram	2016-04-25	1	-79/+71
*	2812	Kartik K. Agaram	2016-03-27	1	-104/+84
*	2745	Kartik K. Agaram	2016-03-09	1	-1/+1
*	2744	Kartik K. Agaram	2016-03-09	1	-4/+4
*	2743	Kartik K. Agaram	2016-03-09	1	-187/+179
*	2710	Kartik K. Agaram	2016-02-25	1	-4/+0
*	2706 - update html	Kartik K. Agaram	2016-02-25	1	-101/+265
*	2605	Kartik K. Agaram	2016-01-26	1	-9/+6
*	2545	Kartik K. Agaram	2015-12-15	1	-18/+20
*	2611	Kartik K. Agaram	2015-11-29	1	-18/+34
*	2423 - describe shape-shifting in html docs	Kartik K. Agaram	2015-11-10	1	-164/+297
*	2175	Kartik K. Agaram	2015-09-06	1	-12/+3
*	2062	Kartik K. Agaram	2015-08-23	1	-81/+99
*	1949	Kartik K. Agaram	2015-08-06	1	-70/+89
*	1925	Kartik K. Agaram	2015-08-03	1	-4/+10
*	1885	Kartik K. Agaram	2015-07-29	1	-108/+107
*	1853	Kartik K. Agaram	2015-07-25	1	-82/+99
*	1818	Kartik K. Agaram	2015-07-18	1	-5/+50
*	1766	Kartik K. Agaram	2015-07-12	1	-36/+40
*	1690	Kartik K. Agaram	2015-07-01	1	-0/+1
*	1632	Kartik K. Agaram	2015-06-23	1	-1/+1
*	1631 - update html versions	Kartik K. Agaram	2015-06-23	1	-10/+39
*	1556	Kartik K. Agaram	2015-06-12	1	-1/+1
*	1549	Kartik K. Agaram	2015-06-09	1	-2/+2
*	1517	Kartik K. Agaram	2015-05-30	1	-14/+29
*	1461 - descriptions/table of contents for the layers	Kartik K. Agaram	2015-05-26	1	-1/+1
*	1459	Kartik K. Agaram	2015-05-25	1	-50/+137
*	1376 - update github docs	Kartik K. Agaram	2015-05-14	1	-57/+168
*	1291	Kartik K. Agaram	2015-05-06	1	-1/+1
*	1279 - colorized rendering of the source files	Kartik K. Agaram	2015-05-06	1	-0/+206

#000000; background-color: #c6c6c6; } a { color:inherit; } * { font-size:12pt; font-size: 1em; } .subxComment { color: #005faf; } .subxS2Comment { color: #8a8a8a; } .subxTest { color: #5f8700; } .subxFunction { color: #af5f00; text-decoration: underline; } .LineNr { } .subxS1Comment { color: #0000af; } .SpecialChar { color: #d70000; } .Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; } .Constant { color: #008787; } .subxH1Comment { color: #005faf; text-decoration: underline; } --> </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/master/apps/factorial.subx'>https://github.com/akkartik/mu/blob/master/apps/factorial.subx</a> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment">## compute the factorial of 5, and print the result</span> <span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> <span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span> <span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ ./bootstrap translate init.linux 0*.subx apps/factorial.subx -o apps/factorial</span> <span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ ./bootstrap run apps/factorial</span> <span id="L6" class="LineNr"> 6 </span><span class="subxComment"># Expected result:</span> <span id="L7" class="LineNr"> 7 </span><span class="subxComment"># $ echo $?</span> <span id="L8" class="LineNr"> 8 </span><span class="subxComment"># 120</span> <span id="L9" class="LineNr"> 9 </span><span class="subxComment">#</span> <span id="L10" class="LineNr"> 10 </span><span class="subxComment"># You can also run the automated test suite:</span> <span id="L11" class="LineNr"> 11 </span><span class="subxComment"># $ ./bootstrap run apps/factorial test</span> <span id="L12" class="LineNr"> 12 </span><span class="subxComment"># Expected output:</span> <span id="L13" class="LineNr"> 13 </span><span class="subxComment"># ........</span> <span id="L14" class="LineNr"> 14 </span><span class="subxComment"># Every '.' indicates a passing test. Failing tests get a 'F'.</span> <span id="L15" class="LineNr"> 15 </span> <span id="L16" class="LineNr"> 16 </span>== code <span id="L17" class="LineNr"> 17 </span><span class="subxComment"># instruction effective address register displacement immediate</span> <span id="L18" class="LineNr"> 18 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> <span id="L19" class="LineNr"> 19 </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="L20" class="LineNr"> 20 </span> <span id="L21" class="LineNr"> 21 </span><span class="SpecialChar">Entry</span>: <span class="subxComment"># run tests if necessary, compute `factorial(5)` if not</span> <span id="L22" class="LineNr"> 22 </span> <span class="subxS1Comment"># . prologue</span> <span id="L23" class="LineNr"> 23 </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="L24" class="LineNr"> 24 </span> <span id="L25" class="LineNr"> 25 </span> <span class="subxComment"># initialize heap</span> <span id="L26" class="LineNr"> 26 </span> <span class="subxS1Comment"># . Heap = new-segment(Heap-size)</span> <span id="L27" class="LineNr"> 27 </span> <span class="subxS2Comment"># . . push args</span> <span id="L28" class="LineNr"> 28 </span> 68/push <span class="SpecialChar"><a href='../069allocate.subx.html#L27'>Heap</a></span>/imm32 <span id="L29" class="LineNr"> 29 </span> ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="SpecialChar"><a href='../069allocate.subx.html#L34'>Heap-size</a></span>/disp32 <span class="subxComment"># push *Heap-size</span> <span id="L30" class="LineNr"> 30 </span> <span class="subxS2Comment"># . . call</span> <span id="L31" class="LineNr"> 31 </span> e8/call <a href='../053new-segment.subx.html#L40'>new-segment</a>/disp32 <span id="L32" class="LineNr"> 32 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L33" class="LineNr"> 33 </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="L34" class="LineNr"> 34 </span> <span id="L35" class="LineNr"> 35 </span> <span class="subxH1Comment"># - if argc > 1 and argv[1] == "test", then return run_tests()</span> <span id="L36" class="LineNr"> 36 </span> <span class="subxComment"># if (argc <= 1) goto run-main</span> <span id="L37" class="LineNr"> 37 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 0/disp8 1/imm32 <span class="subxComment"># compare *ebp</span> <span id="L38" class="LineNr"> 38 </span> 7e/jump-if-<= $run-main/disp8 <span id="L39" class="LineNr"> 39 </span> <span class="subxComment"># if (!kernel-string-equal?(argv[1], "test")) goto run-main</span> <span id="L40" class="LineNr"> 40 </span> <span class="subxS1Comment"># . eax = kernel-string-equal?(argv[1], "test")</span> <span id="L41" class="LineNr"> 41 </span> <span class="subxS2Comment"># . . push args</span> <span id="L42" class="LineNr"> 42 </span> 68/push <span class="Constant">"test"</span>/imm32 <span id="L43" class="LineNr"> 43 </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="L44" class="LineNr"> 44 </span> <span class="subxS2Comment"># . . call</span> <span id="L45" class="LineNr"> 45 </span> e8/call <a href='../052kernel-string-equal.subx.html#L31'>kernel-string-equal?</a>/disp32 <span id="L46" class="LineNr"> 46 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L47" class="LineNr"> 47 </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="L48" class="LineNr"> 48 </span> <span class="subxS1Comment"># . if (eax == false) goto run-main</span> <span id="L49" class="LineNr"> 49 </span> 3d/compare-eax-and 0/imm32/false <span id="L50" class="LineNr"> 50 </span> 74/jump-if-= $run-main/disp8 <span id="L51" class="LineNr"> 51 </span> <span class="subxComment"># run-tests()</span> <span id="L52" class="LineNr"> 52 </span> e8/call run-tests/disp32 <span id="L53" class="LineNr"> 53 </span> <span class="subxComment"># syscall(exit, *Num-test-failures)</span> <span id="L54" class="LineNr"> 54 </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#L89'>Num-test-failures</a></span>/disp32 <span class="subxComment"># copy *Num-test-failures to ebx</span> <span id="L55" class="LineNr"> 55 </span> eb/jump $main:end/disp8 <span id="L56" class="LineNr"> 56 </span><span class="Constant">$run-main</span>: <span id="L57" class="LineNr"> 57 </span> <span class="subxH1Comment"># - otherwise print factorial(5)</span> <span id="L58" class="LineNr"> 58 </span> <span class="subxComment"># eax = factorial(5)</span> <span id="L59" class="LineNr"> 59 </span> <span class="subxS2Comment"># . . push args</span> <span id="L60" class="LineNr"> 60 </span> 68/push 5/imm32 <span id="L61" class="LineNr"> 61 </span> <span class="subxS2Comment"># . . call</span> <span id="L62" class="LineNr"> 62 </span> e8/call <a href='factorial.subx.html#L100'>factorial</a>/disp32 <span id="L63" class="LineNr"> 63 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L64" class="LineNr"> 64 </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="L65" class="LineNr"> 65 </span> <span class="subxComment"># var buffer/ecx: (stream byte 10) # number of decimal digits a 32-bit number can have</span> <span id="L66" class="LineNr"> 66 </span> 81 5/subop/subtract 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> 0xa/imm32 <span class="subxComment"># subtract from esp</span> <span id="L67" class="LineNr"> 67 </span> 68/push 0xa/imm32/decimal-digits-in-32bit-number <span id="L68" class="LineNr"> 68 </span> 68/push 0/imm32/read <span id="L69" class="LineNr"> 69 </span> 68/push 0/imm32/write <span id="L70" class="LineNr"> 70 </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="L71" class="LineNr"> 71 </span> <span class="subxComment"># write-int32-decimal(buffer, eax)</span> <span id="L72" class="LineNr"> 72 </span> <span class="subxS2Comment"># . . push args</span> <span id="L73" class="LineNr"> 73 </span> 50/push-eax <span id="L74" class="LineNr"> 74 </span> 51/push-ecx <span id="L75" class="LineNr"> 75 </span> <span class="subxS2Comment"># . . call</span> <span id="L76" class="LineNr"> 76 </span> e8/call <a href='../075write-int-decimal.subx.html#L8'>write-int32-decimal</a>/disp32 <span id="L77" class="LineNr"> 77 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L78" class="LineNr"> 78 </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="L79" class="LineNr"> 79 </span> <span class="subxComment"># write-stream(stderr, buffer)</span> <span id="L80" class="LineNr"> 80 </span> <span class="subxS2Comment"># . . push args</span> <span id="L81" class="LineNr"> 81 </span> 51/push-ecx <span id="L82" class="LineNr"> 82 </span> 68/push 2/imm32/stderr <span id="L83" class="LineNr"> 83 </span> <span class="subxS2Comment"># . . call</span> <span id="L84" class="LineNr"> 84 </span> e8/call <a href='../062write-stream.subx.html#L17'>write-stream</a>/disp32 <span id="L85" class="LineNr"> 85 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L86" class="LineNr"> 86 </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="L87" class="LineNr"> 87 </span> <span class="subxComment"># write(stderr, Newline)</span> <span id="L88" class="LineNr"> 88 </span> <span class="subxS2Comment"># . . push args</span> <span id="L89" class="LineNr"> 89 </span> 68/push <span class="SpecialChar"><a href='../051test.subx.html#L82'>Newline</a></span>/imm32 <span id="L90" class="LineNr"> 90 </span> 68/push 2/imm32/stderr <span id="L91" class="LineNr"> 91 </span> <span class="subxS2Comment"># . . call</span> <span id="L92" class="LineNr"> 92 </span> e8/call <a href='../057write.subx.html#L24'>write</a>/disp32 <span id="L93" class="LineNr"> 93 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L94" class="LineNr"> 94 </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="L95" class="LineNr"> 95 </span> <span class="subxComment"># syscall(exit, eax)</span> <span id="L96" class="LineNr"> 96 </span> 89/copy 3/mod/direct 3/rm32/ebx <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"># copy eax to ebx</span> <span id="L97" class="LineNr"> 97 </span><span class="Constant">$main:end</span>: <span id="L98" class="LineNr"> 98 </span> e8/call syscall_exit/disp32 <span id="L99" class="LineNr"> 99 </span> <span id="L100" class="LineNr">100 </span><span class="subxFunction">factorial</span>: <span class="subxComment"># n: int -> int/eax</span> <span id="L101" class="LineNr">101 </span> <span class="subxS1Comment"># . prologue</span> <span id="L102" class="LineNr">102 </span> 55/push-ebp <span id="L103" class="LineNr">103 </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="L104" class="LineNr">104 </span> 53/push-ebx <span id="L105" class="LineNr">105 </span> <span class="subxComment"># if (n <= 1) return 1</span> <span id="L106" class="LineNr">106 </span> b8/copy-to-eax 1/imm32 <span id="L107" class="LineNr">107 </span> 81 7/subop/compare 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 1/imm32 <span class="subxComment"># compare *(ebp+8)</span> <span id="L108" class="LineNr">108 </span> 7e/jump-if-<= $factorial:end/disp8 <span id="L109" class="LineNr">109 </span> <span class="subxComment"># var ebx: int = n-1</span> <span id="L110" class="LineNr">110 </span> 8b/copy 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 3/r32/ebx 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy *(ebp+8) to ebx</span> <span id="L111" class="LineNr">111 </span> 4b/decrement-ebx <span id="L112" class="LineNr">112 </span> <span class="subxComment"># var eax: int = factorial(n-1)</span> <span id="L113" class="LineNr">113 </span> <span class="subxS2Comment"># . . push args</span> <span id="L114" class="LineNr">114 </span> 53/push-ebx <span id="L115" class="LineNr">115 </span> <span class="subxS2Comment"># . . call</span> <span id="L116" class="LineNr">116 </span> e8/call <a href='factorial.subx.html#L100'>factorial</a>/disp32 <span id="L117" class="LineNr">117 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L118" class="LineNr">118 </span> 81 0/subop/add 3/mod/direct 4/rm32/esp <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 4/imm32 <span class="subxComment"># add to esp</span> <span id="L119" class="LineNr">119 </span> <span class="subxComment"># return n * factorial(n-1)</span> <span id="L120" class="LineNr">120 </span> f7 4/subop/multiply 1/mod/*+disp8 5/rm32/ebp <span class="Normal"> . </span> <span class="Normal"> . </span> 8/disp8 <span class="Normal"> . </span> <span class="subxComment"># multiply *(ebp+8) into eax</span> <span id="L121" class="LineNr">121 </span> <span class="subxComment"># TODO: check for overflow</span> <span id="L122" class="LineNr">122 </span><span class="Constant">$factorial:end</span>: <span id="L123" class="LineNr">123 </span> <span class="subxS1Comment"># . epilogue</span> <span id="L124" class="LineNr">124 </span> 5b/pop-to-ebx <span id="L125" class="LineNr">125 </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="L126" class="LineNr">126 </span> 5d/pop-to-ebp <span id="L127" class="LineNr">127 </span> c3/return <span id="L128" class="LineNr">128 </span> <span id="L129" class="LineNr">129 </span><span class="subxTest">test-factorial</span>: <span id="L130" class="LineNr">130 </span> <span class="subxComment"># factorial(5)</span> <span id="L131" class="LineNr">131 </span> <span class="subxS2Comment"># . . push args</span> <span id="L132" class="LineNr">132 </span> 68/push 5/imm32 <span id="L133" class="LineNr">133 </span> <span class="subxS2Comment"># . . call</span> <span id="L134" class="LineNr">134 </span> e8/call <a href='factorial.subx.html#L100'>factorial</a>/disp32 <span id="L135" class="LineNr">135 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L136" class="LineNr">136 </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="L137" class="LineNr">137 </span> <span class="subxComment"># check-ints-equal(eax, 120, msg)</span> <span id="L138" class="LineNr">138 </span> <span class="subxS2Comment"># . . push args</span> <span id="L139" class="LineNr">139 </span> 68/push <span class="Constant">"F - test-factorial"</span>/imm32 <span id="L140" class="LineNr">140 </span> 68/push 0x78/imm32/expected-120 <span id="L141" class="LineNr">141 </span> 50/push-eax <span id="L142" class="LineNr">142 </span> <span class="subxS2Comment"># . . call</span> <span id="L143" class="LineNr">143 </span> e8/call <a href='../051test.subx.html#L23'>check-ints-equal</a>/disp32 <span id="L144" class="LineNr">144 </span> <span class="subxS2Comment"># . . discard args</span> <span id="L145" class="LineNr">145 </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="L146" class="LineNr">146 </span> <span class="subxComment"># end</span> <span id="L147" class="LineNr">147 </span> c3/return <span id="L148" class="LineNr">148 </span> <span id="L149" class="LineNr">149 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> </pre> </body> </html>