5522 - example app: random number stream
Turns out Mu's kernel isn't populating /dev/random correctly.
This commit is contained in:
Kartik Agaram
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668700fd2c
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0bb09d2e14
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# Repeatedly read 32-bit numbers from /dev/random, print them to stdout.
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#
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# To run:
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# $ ./subx translate 0*.subx apps/random.subx -o apps/random
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# $ ./subx run apps/random
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== code 0x09000000
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# instruction effective address register displacement immediate
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# . op subop mod rm32 base index scale r32
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# . 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
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Entry:
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# stream/ESI = syscall(open, "/dev/null", O_RDONLY, 0) # we can't use 'fd' because it looks like a hex byte
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bb/copy-to-EBX Filename/imm32
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b9/copy-to-ECX 0/imm32/rdonly
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ba/copy-to-EDX 0x180/imm32/fixed-perms
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b8/copy-to-EAX 5/imm32/open
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cd/syscall 0x80/imm8
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# . stream = EAX
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89/copy 3/mod/direct 6/rm32/ESI . . . 0/r32/EAX . . # copy EAX to ESI
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$loop:
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# syscall(read, Stream, N, 4)
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89/copy 3/mod/direct 3/rm32/EBX . . . 6/r32/ESI . . # copy ESI to EBX
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b9/copy-to-ECX N/imm32
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ba/copy-to-EDX 4/imm32/size
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b8/copy-to-EAX 3/imm32/read
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cd/syscall 0x80/imm8
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# print-int32-buffered(Stdout, *N)
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# . . push args
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ff 6/subop/push 0/mod/indirect 5/rm32/.disp32 . . . N/disp32 # push *N
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68/push Stdout/imm32
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# . . call
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e8/call print-int32-buffered/disp32
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# write-buffered(Stdout, Newline)
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# . . push args
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68/push Newline/imm32
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68/push Stdout/imm32
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# . . call
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e8/call write-buffered/disp32
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# . . discard args
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81 0/subop/add 3/mod/direct 4/rm32/ESP . . . . . 8/imm32 # add to ESP
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eb/jump $loop/disp8
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# syscall(exit, 0)
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bb/copy-to-EBX 0/imm32
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b8/copy-to-EAX 1/imm32/exit
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cd/syscall 0x80/imm8
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== data 0x0a000000
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N:
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0/imm32
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Filename:
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2f 64 65 76 2f 72 61 6e 64 6f 6d 00
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# / d e v / r a n d o m null
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# . . vim:nowrap:textwidth=0
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@ -0,0 +1,124 @@
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Mu - apps/random.subx</title>
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<meta name="Generator" content="Vim/8.1">
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<meta name="plugin-version" content="vim8.1_v1">
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<meta name="syntax" content="none">
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<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy=">
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<meta name="colorscheme" content="minimal-light">
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<style type="text/css">
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<!--
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pre { font-family: monospace; color: #000000; background-color: #c6c6c6; }
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body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; }
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a { color:inherit; }
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* { font-size:12pt; font-size: 1em; }
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.subxComment { color: #005faf; }
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.subxS2Comment { color: #8a8a8a; }
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.LineNr { }
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.subxS1Comment { color: #0000af; }
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.SpecialChar { color: #d70000; }
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.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; }
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.Constant { color: #008787; }
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-->
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</style>
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<script type='text/javascript'>
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<!--
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/* function to open any folds containing a jumped-to line before jumping to it */
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function JumpToLine()
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{
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var lineNum;
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lineNum = window.location.hash;
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lineNum = lineNum.substr(1); /* strip off '#' */
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if (lineNum.indexOf('L') == -1) {
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lineNum = 'L'+lineNum;
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}
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var lineElem = document.getElementById(lineNum);
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/* Always jump to new location even if the line was hidden inside a fold, or
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* we corrected the raw number to a line ID.
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*/
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if (lineElem) {
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lineElem.scrollIntoView(true);
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}
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return true;
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}
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if ('onhashchange' in window) {
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window.onhashchange = JumpToLine;
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}
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-->
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</script>
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</head>
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<body onload='JumpToLine();'>
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<a href='https://github.com/akkartik/mu/blob/master/apps/random.subx'>https://github.com/akkartik/mu/blob/master/apps/random.subx</a>
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<pre id='vimCodeElement'>
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<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Repeatedly read 32-bit numbers from /dev/random, print them to stdout.</span>
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<span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span>
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<span id="L3" class="LineNr"> 3 </span><span class="subxComment"># To run:</span>
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<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># $ ./subx translate 0*.subx apps/random.subx -o apps/random</span>
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<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ ./subx run apps/random</span>
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<span id="L6" class="LineNr"> 6 </span>
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<span id="L7" class="LineNr"> 7 </span>== code 0x09000000
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<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># instruction effective address register displacement immediate</span>
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<span id="L9" class="LineNr"> 9 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span>
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<span id="L10" class="LineNr">10 </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>
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<span id="L11" class="LineNr">11 </span>
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<span id="L12" class="LineNr">12 </span><span class="SpecialChar">Entry</span>:
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<span id="L13" class="LineNr">13 </span> <span class="subxComment"># stream/ESI = syscall(open, "/dev/null", O_RDONLY, 0) # we can't use 'fd' because it looks like a hex byte</span>
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<span id="L14" class="LineNr">14 </span> bb/copy-to-EBX <span class="SpecialChar"><a href='random.subx.html#L58'>Filename</a></span>/imm32
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<span id="L15" class="LineNr">15 </span> b9/copy-to-ECX 0/imm32/rdonly
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<span id="L16" class="LineNr">16 </span> ba/copy-to-EDX 0x180/imm32/fixed-perms
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<span id="L17" class="LineNr">17 </span> b8/copy-to-EAX 5/imm32/open
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<span id="L18" class="LineNr">18 </span> cd/syscall 0x80/imm8
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<span id="L19" class="LineNr">19 </span> <span class="subxS1Comment"># . stream = EAX</span>
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<span id="L20" class="LineNr">20 </span> 89/copy 3/mod/direct 6/rm32/ESI <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 ESI</span>
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<span id="L21" class="LineNr">21 </span>
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<span id="L22" class="LineNr">22 </span><span class="Constant">$loop</span>:
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<span id="L23" class="LineNr">23 </span>
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<span id="L24" class="LineNr">24 </span> <span class="subxComment"># syscall(read, Stream, N, 4)</span>
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<span id="L25" class="LineNr">25 </span> 89/copy 3/mod/direct 3/rm32/EBX <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="Normal"> . </span> 6/r32/ESI <span class="Normal"> . </span> <span class="Normal"> . </span> <span class="subxComment"># copy ESI to EBX</span>
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<span id="L26" class="LineNr">26 </span> b9/copy-to-ECX <span class="SpecialChar"><a href='random.subx.html#L56'>N</a></span>/imm32
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<span id="L27" class="LineNr">27 </span> ba/copy-to-EDX 4/imm32/size
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<span id="L28" class="LineNr">28 </span> b8/copy-to-EAX 3/imm32/read
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<span id="L29" class="LineNr">29 </span> cd/syscall 0x80/imm8
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<span id="L30" class="LineNr">30 </span>
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<span id="L31" class="LineNr">31 </span> <span class="subxComment"># print-int32-buffered(Stdout, *N)</span>
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<span id="L32" class="LineNr">32 </span> <span class="subxS2Comment"># . . push args</span>
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<span id="L33" class="LineNr">33 </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='random.subx.html#L56'>N</a></span>/disp32 <span class="subxComment"># push *N</span>
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<span id="L34" class="LineNr">34 </span> 68/push <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span>/imm32
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<span id="L35" class="LineNr">35 </span> <span class="subxS2Comment"># . . call</span>
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<span id="L36" class="LineNr">36 </span> e8/call <a href='../066print-int.subx.html#L267'>print-int32-buffered</a>/disp32
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<span id="L37" class="LineNr">37 </span>
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<span id="L38" class="LineNr">38 </span> <span class="subxComment"># write-buffered(Stdout, Newline)</span>
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<span id="L39" class="LineNr">39 </span> <span class="subxS2Comment"># . . push args</span>
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<span id="L40" class="LineNr">40 </span> 68/push <span class="SpecialChar"><a href='../051test.subx.html#L83'>Newline</a></span>/imm32
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<span id="L41" class="LineNr">41 </span> 68/push <span class="SpecialChar"><a href='../064write-byte.subx.html#L10'>Stdout</a></span>/imm32
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<span id="L42" class="LineNr">42 </span> <span class="subxS2Comment"># . . call</span>
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<span id="L43" class="LineNr">43 </span> e8/call <a href='../065write-buffered.subx.html#L8'>write-buffered</a>/disp32
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<span id="L44" class="LineNr">44 </span> <span class="subxS2Comment"># . . discard args</span>
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<span id="L45" class="LineNr">45 </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>
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<span id="L46" class="LineNr">46 </span>
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<span id="L47" class="LineNr">47 </span> eb/jump $loop/disp8
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<span id="L48" class="LineNr">48 </span>
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<span id="L49" class="LineNr">49 </span> <span class="subxComment"># syscall(exit, 0)</span>
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<span id="L50" class="LineNr">50 </span> bb/copy-to-EBX 0/imm32
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<span id="L51" class="LineNr">51 </span> b8/copy-to-EAX 1/imm32/exit
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<span id="L52" class="LineNr">52 </span> cd/syscall 0x80/imm8
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<span id="L53" class="LineNr">53 </span>
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<span id="L54" class="LineNr">54 </span>== data 0x0a000000
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<span id="L55" class="LineNr">55 </span>
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<span id="L56" class="LineNr">56 </span><span class="SpecialChar">N</span>:
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<span id="L57" class="LineNr">57 </span> 0/imm32
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<span id="L58" class="LineNr">58 </span><span class="SpecialChar">Filename</span>:
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<span id="L59" class="LineNr">59 </span> 2f 64 65 76 2f 72 61 6e 64 6f 6d 00
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<span id="L60" class="LineNr">60 </span><span class="subxComment"># / d e v / r a n d o m null</span>
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<span id="L61" class="LineNr">61 </span>
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<span id="L62" class="LineNr">62 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span>
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</pre>
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</body>
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</html>
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<!-- vim: set foldmethod=manual : -->
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