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Diffstat (limited to 'html/linux/ex5.subx.html')
| -rw-r--r-- | html/linux/ex5.subx.html | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/html/linux/ex5.subx.html b/html/linux/ex5.subx.html new file mode 100644 index 00000000..ebb628ae --- /dev/null +++ b/html/linux/ex5.subx.html @@ -0,0 +1,101 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> +<html> +<head> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<title>Mu - linux/ex5.subx</title> +<meta name="Generator" content="Vim/8.1"> +<meta name="plugin-version" content="vim8.1_v1"> +<meta name="syntax" content="none"> +<meta name="settings" content="number_lines,use_css,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal-light"> +<style type="text/css"> +<!-- +pre { font-family: monospace; color: #000000; background-color: #c6c6c6; } +body { font-size:12pt; font-family: monospace; color: #000000; background-color: #c6c6c6; } +a { color:inherit; } +* { font-size:12pt; font-size: 1em; } +.subxComment { color: #005faf; } +.subxS1Comment { color: #0000af; } +.subxS2Comment { color: #8a8a8a; } +.LineNr { } +.SpecialChar { color: #d70000; } +.Normal { color: #000000; background-color: #c6c6c6; padding-bottom: 1px; } +--> +</style> + +<script type='text/javascript'> +<!-- + +/* function to open any folds containing a jumped-to line before jumping to it */ +function JumpToLine() +{ + var lineNum; + lineNum = window.location.hash; + lineNum = lineNum.substr(1); /* strip off '#' */ + + if (lineNum.indexOf('L') == -1) { + lineNum = 'L'+lineNum; + } + var lineElem = document.getElementById(lineNum); + /* Always jump to new location even if the line was hidden inside a fold, or + * we corrected the raw number to a line ID. + */ + if (lineElem) { + lineElem.scrollIntoView(true); + } + return true; +} +if ('onhashchange' in window) { + window.onhashchange = JumpToLine; +} + +--> +</script> +</head> +<body onload='JumpToLine();'> +<a href='https://github.com/akkartik/mu/blob/main/linux/ex5.subx'>https://github.com/akkartik/mu/blob/main/linux/ex5.subx</a> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Read a character from stdin, save it to a local on the stack, write it to stdout.</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/bootstrap translate apps/ex5.subx -o apps/ex5</span> +<span id="L5" class="LineNr"> 5 </span><span class="subxComment"># $ bootstrap/bootstrap run ex5</span> +<span id="L6" class="LineNr"> 6 </span> +<span id="L7" class="LineNr"> 7 </span>== code +<span id="L8" class="LineNr"> 8 </span><span class="subxComment"># instruction effective address register displacement immediate</span> +<span id="L9" class="LineNr"> 9 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> +<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> +<span id="L11" class="LineNr">11 </span> +<span id="L12" class="LineNr">12 </span><span class="SpecialChar">Entry</span>: +<span id="L13" class="LineNr">13 </span> +<span id="L14" class="LineNr">14 </span> <span class="subxComment"># allocate x on the stack</span> +<span id="L15" class="LineNr">15 </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> 4/imm32 <span class="subxComment"># subtract from esp</span> +<span id="L16" class="LineNr">16 </span> +<span id="L17" class="LineNr">17 </span> <span class="subxComment"># read(stdin, x, 1)</span> +<span id="L18" class="LineNr">18 </span> <span class="subxS1Comment"># . fd = 0 (stdin)</span> +<span id="L19" class="LineNr">19 </span> bb/copy-to-ebx 0/imm32 +<span id="L20" class="LineNr">20 </span> <span class="subxS1Comment"># . data = x (location to write result to)</span> +<span id="L21" class="LineNr">21 </span> 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy esp+4 to ecx</span> +<span id="L22" class="LineNr">22 </span> <span class="subxS1Comment"># . size = 1 character</span> +<span id="L23" class="LineNr">23 </span> ba/copy-to-edx 1/imm32 +<span id="L24" class="LineNr">24 </span> <span class="subxS1Comment"># . syscall</span> +<span id="L25" class="LineNr">25 </span> e8/call <a href='000init.subx.html#L23'>syscall_read</a>/disp32 +<span id="L26" class="LineNr">26 </span> +<span id="L27" class="LineNr">27 </span> <span class="subxComment"># syscall(write, stdout, x, 1)</span> +<span id="L28" class="LineNr">28 </span> <span class="subxS1Comment"># . fd = 1 (stdout)</span> +<span id="L29" class="LineNr">29 </span> bb/copy-to-ebx 1/imm32 +<span id="L30" class="LineNr">30 </span> <span class="subxS1Comment"># . data = x (location to read from)</span> +<span id="L31" class="LineNr">31 </span> 8d/copy-address 1/mod/*+disp8 4/rm32/sib 4/base/esp 4/index/none 1/r32/ecx 4/disp8 <span class="Normal"> . </span> <span class="subxComment"># copy esp+4 to ecx</span> +<span id="L32" class="LineNr">32 </span> <span class="subxS1Comment"># . size = 1 character</span> +<span id="L33" class="LineNr">33 </span> ba/copy-to-edx 1/imm32 +<span id="L34" class="LineNr">34 </span> <span class="subxS1Comment"># . syscall</span> +<span id="L35" class="LineNr">35 </span> e8/call <a href='000init.subx.html#L29'>syscall_write</a>/disp32 +<span id="L36" class="LineNr">36 </span> +<span id="L37" class="LineNr">37 </span> <span class="subxComment"># exit(ebx)</span> +<span id="L38" class="LineNr">38 </span> e8/call <a href='000init.subx.html#L18'>syscall_exit</a>/disp32 +<span id="L39" class="LineNr">39 </span> +<span id="L40" class="LineNr">40 </span><span class="subxS2Comment"># . . vim:nowrap:textwidth=0</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |