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| author | Kartik Agaram <vc@akkartik.com> | 2018-08-13 21:25:22 -0700 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2018-08-13 21:25:22 -0700 |
| commit | 7328af20a1921d9258a60803ee5367da97a6082e (patch) | |
| tree | e809d6cff85f290073a71982a5d24255848678ac /html/subx/ex8.subx.html | |
| parent | 5cec03b41425940ff5fa73c10ea8fb402a3b5ffa (diff) | |
| download | mu-7328af20a1921d9258a60803ee5367da97a6082e.tar.gz | |
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Diffstat (limited to 'html/subx/ex8.subx.html')
| -rw-r--r-- | html/subx/ex8.subx.html | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/html/subx/ex8.subx.html b/html/subx/ex8.subx.html new file mode 100644 index 00000000..96bfb430 --- /dev/null +++ b/html/subx/ex8.subx.html @@ -0,0 +1,159 @@ +<!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 - subx/ex8.subx</title> +<meta name="Generator" content="Vim/7.4"> +<meta name="plugin-version" content="vim7.4_v2"> +<meta name="syntax" content="none"> +<meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> +<meta name="colorscheme" content="minimal"> +<style type="text/css"> +<!-- +pre { white-space: pre-wrap; font-family: monospace; color: #aaaaaa; background-color: #080808; } +body { font-size: 12pt; font-family: monospace; color: #aaaaaa; background-color: #080808; } +a { color:#eeeeee; text-decoration: none; } +a:hover { text-decoration: underline; } +* { font-size: 12pt; font-size: 1em; } +.SalientComment { color: #00ffff; } +.Delimiter { color: #800080; } +.LineNr { color: #444444; } +.Comment { color: #9090ff; } +.Comment a { color:#0000ee; text-decoration:underline; } +--> +</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; + } + 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();'> +<pre id='vimCodeElement'> +<span id="L1" class="LineNr"> 1 </span><span class="SalientComment">## example showing file syscalls</span> +<span id="L2" class="LineNr"> 2 </span><span class="Comment"># Create a file, open it for writing, write a character to it, close it, open</span> +<span id="L3" class="LineNr"> 3 </span><span class="Comment"># it for reading, read a character from it, close it, delete it, and return</span> +<span id="L4" class="LineNr"> 4 </span><span class="Comment"># the character read.</span> +<span id="L5" class="LineNr"> 5 </span><span class="Comment">#</span> +<span id="L6" class="LineNr"> 6 </span><span class="Comment"># To run:</span> +<span id="L7" class="LineNr"> 7 </span><span class="Comment"># $ subx translate ex8.subx ex8</span> +<span id="L8" class="LineNr"> 8 </span><span class="Comment"># $ subx run ex8</span> +<span id="L9" class="LineNr"> 9 </span><span class="Comment"># Expected result:</span> +<span id="L10" class="LineNr">10 </span><span class="Comment"># $ echo $?</span> +<span id="L11" class="LineNr">11 </span><span class="Comment"># 97</span> +<span id="L12" class="LineNr">12 </span> +<span id="L13" class="LineNr">13 </span>== 0x08048074 <span class="Comment"># code segment, after leaving room for ELF header and segment headers</span> +<span id="L14" class="LineNr">14 </span><span class="Comment"># instruction effective address operand displacement immediate</span> +<span id="L15" class="LineNr">15 </span><span class="Comment"># op subop mod rm32 base index scale r32</span> +<span id="L16" class="LineNr">16 </span><span class="Comment"># 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="L17" class="LineNr">17 </span> +<span id="L18" class="LineNr">18 </span> <span class="SalientComment">## creat(filename)</span> +<span id="L19" class="LineNr">19 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049131/imm32/fname <span class="Comment"># copy to EBX</span> +<span id="L20" class="LineNr">20 </span> b9/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x180/imm32/fixed-perms <span class="Comment"># copy 0 to ECX</span> +<span id="L21" class="LineNr">21 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 8/imm32/creat <span class="Comment"># copy 8 to EAX</span> +<span id="L22" class="LineNr">22 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L23" class="LineNr">23 </span> +<span id="L24" class="LineNr">24 </span> <span class="SalientComment">## fd = open(filename, O_WRONLY, 0)</span> +<span id="L25" class="LineNr">25 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049131/imm32/fname <span class="Comment"># copy to EBX</span> +<span id="L26" class="LineNr">26 </span> b9/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/wronly <span class="Comment"># copy 1 to ECX</span> +<span id="L27" class="LineNr">27 </span> ba/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x180/imm32/fixed-perms <span class="Comment"># copy 0 to EDX</span> +<span id="L28" class="LineNr">28 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/imm32/open <span class="Comment"># copy 5 to EAX</span> +<span id="L29" class="LineNr">29 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L30" class="LineNr">30 </span> <span class="Comment"># save fd</span> +<span id="L31" class="LineNr">31 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L32" class="LineNr">32 </span> 89/copy 0/mod/indirect 3/rm32/EBX 0/r32/EAX <span class="Comment"># copy EAX to *EBX</span> +<span id="L33" class="LineNr">33 </span> +<span id="L34" class="LineNr">34 </span> <span class="SalientComment">## write(fd, "a", 1)</span> +<span id="L35" class="LineNr">35 </span> <span class="Comment"># load fd</span> +<span id="L36" class="LineNr">36 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L37" class="LineNr">37 </span> 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX <span class="Comment"># copy *EBX to EBX</span> +<span id="L38" class="LineNr">38 </span> <span class="Comment">#</span> +<span id="L39" class="LineNr">39 </span> b9/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049129/imm32/a <span class="Comment"># copy to ECX</span> +<span id="L40" class="LineNr">40 </span> ba/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/size <span class="Comment"># copy 1 to EDX</span> +<span id="L41" class="LineNr">41 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 4/imm32/write <span class="Comment"># copy 4 to EAX</span> +<span id="L42" class="LineNr">42 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L43" class="LineNr">43 </span> +<span id="L44" class="LineNr">44 </span> <span class="SalientComment">## close(fd)</span> +<span id="L45" class="LineNr">45 </span> <span class="Comment"># load fd</span> +<span id="L46" class="LineNr">46 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L47" class="LineNr">47 </span> 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX <span class="Comment"># copy *EBX to EBX</span> +<span id="L48" class="LineNr">48 </span> <span class="Comment">#</span> +<span id="L49" class="LineNr">49 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 6/imm32/close <span class="Comment"># copy 6 to EAX</span> +<span id="L50" class="LineNr">50 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L51" class="LineNr">51 </span> +<span id="L52" class="LineNr">52 </span> <span class="SalientComment">## fd = open(filename, O_RDONLY, 0)</span> +<span id="L53" class="LineNr">53 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049131/imm32/fname <span class="Comment"># copy to EBX</span> +<span id="L54" class="LineNr">54 </span> b9/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0/imm32/rdonly <span class="Comment"># copy 0 to ECX</span> +<span id="L55" class="LineNr">55 </span> ba/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x180/imm32/fixed-perms <span class="Comment"># copy 0 to EDX</span> +<span id="L56" class="LineNr">56 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 5/imm32/open <span class="Comment"># copy 5 to EAX</span> +<span id="L57" class="LineNr">57 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L58" class="LineNr">58 </span> <span class="Comment"># save fd</span> +<span id="L59" class="LineNr">59 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L60" class="LineNr">60 </span> 89/copy 0/mod/indirect 3/rm32/EBX 0/r32/EAX <span class="Comment"># copy EAX to *EBX</span> +<span id="L61" class="LineNr">61 </span> +<span id="L62" class="LineNr">62 </span> <span class="SalientComment">## read(fd, b, 1)</span> +<span id="L63" class="LineNr">63 </span> <span class="Comment"># load fd</span> +<span id="L64" class="LineNr">64 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L65" class="LineNr">65 </span> 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX <span class="Comment"># copy *EBX to EBX</span> +<span id="L66" class="LineNr">66 </span> <span class="Comment">#</span> +<span id="L67" class="LineNr">67 </span> b9/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x0804912d/imm32/b <span class="Comment"># copy to ECX</span> +<span id="L68" class="LineNr">68 </span> ba/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/size <span class="Comment"># copy 1 to EDX</span> +<span id="L69" class="LineNr">69 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 3/imm32/read <span class="Comment"># copy 3 to EAX</span> +<span id="L70" class="LineNr">70 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L71" class="LineNr">71 </span> +<span id="L72" class="LineNr">72 </span> <span class="SalientComment">## close(fd)</span> +<span id="L73" class="LineNr">73 </span> <span class="Comment"># load fd</span> +<span id="L74" class="LineNr">74 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049125/imm32/fd <span class="Comment"># copy to EBX</span> +<span id="L75" class="LineNr">75 </span> 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX <span class="Comment"># copy *EBX to EBX</span> +<span id="L76" class="LineNr">76 </span> <span class="Comment">#</span> +<span id="L77" class="LineNr">77 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 6/imm32/close <span class="Comment"># copy 8 to EAX</span> +<span id="L78" class="LineNr">78 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L79" class="LineNr">79 </span> +<span id="L80" class="LineNr">80 </span> <span class="SalientComment">## unlink(filename)</span> +<span id="L81" class="LineNr">81 </span> bb/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x08049131/imm32/fname <span class="Comment"># copy to EBX</span> +<span id="L82" class="LineNr">82 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0xa/imm32/unlink <span class="Comment"># copy 8 to EAX</span> +<span id="L83" class="LineNr">83 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L84" class="LineNr">84 </span> +<span id="L85" class="LineNr">85 </span> <span class="SalientComment">## exit(b)</span> +<span id="L86" class="LineNr">86 </span> <span class="Comment"># load b</span> +<span id="L87" class="LineNr">87 </span> bb <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x0804912d/imm32/b <span class="Comment"># copy to EBX</span> +<span id="L88" class="LineNr">88 </span> 8b/copy 0/mod/indirect 3/rm32/EBX 3/r32/EBX <span class="Comment"># copy *EBX to EBX</span> +<span id="L89" class="LineNr">89 </span> <span class="Comment">#</span> +<span id="L90" class="LineNr">90 </span> b8/copy <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 1/imm32/exit <span class="Comment"># copy 1 to EAX</span> +<span id="L91" class="LineNr">91 </span> cd/syscall <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> <span class="Delimiter"> . </span> 0x80/imm8 <span class="Comment"># int 80h</span> +<span id="L92" class="LineNr">92 </span> +<span id="L93" class="LineNr">93 </span>== 0x08049125 <span class="Comment"># data segment</span> +<span id="L94" class="LineNr">94 </span>00 00 00 00 <span class="Comment"># fd</span> +<span id="L95" class="LineNr">95 </span>61 00 00 00 <span class="Comment"># a: string to write to file: 'a'</span> +<span id="L96" class="LineNr">96 </span>00 00 00 00 <span class="Comment"># b: space for string read from file</span> +<span id="L97" class="LineNr">97 </span>2e 66 6f 6f 00 00 00 00 <span class="Comment"># filename: '.foo'</span> +<span id="L98" class="LineNr">98 </span> +<span id="L99" class="LineNr">99 </span><span class="Comment"># vim:ft=subx:nowrap:tw&</span> +</pre> +</body> +</html> +<!-- vim: set foldmethod=manual : --> |