<!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/ex7.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: #ffffd7; } body { font-size:12pt; font-family: monospace; color: #000000; background-color: #ffffd7; } a { color:inherit; } * { font-size:12pt; font-size: 1em; } .subxComment { color: #005faf; } .subxS2Comment { color: #8a8a8a; } .LineNr { } .subxS1Comment { color: #0000af; } .SpecialChar { color: #d70000; } .Normal { color: #000000; background-color: #ffffd7; 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/ex7.subx'>https://github.com/akkartik/mu/blob/main/linux/ex7.subx</a> <pre id='vimCodeElement'> <span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Example showing file syscalls.</span> <span id="L2" class="LineNr"> 2 </span><span class="subxComment">#</span> <span id="L3" class="LineNr"> 3 </span><span class="subxComment"># Create a file, open it for writing, write a character to it, close it, open</span> <span id="L4" class="LineNr"> 4 </span><span class="subxComment"># it for reading, read a character from it, close it, delete it, and return</span> <span id="L5" class="LineNr"> 5 </span><span class="subxComment"># the character read.</span> <span id="L6" class="LineNr"> 6 </span><span class="subxComment">#</span> <span id="L7" class="LineNr"> 7 </span><span class="subxComment"># To run:</span> <span id="L8" class="LineNr"> 8 </span><span class="subxComment"># $ bootstrap/bootstrap translate ex7.subx -o ex7</span> <span id="L9" class="LineNr"> 9 </span><span class="subxComment"># $ bootstrap/bootstrap run ex7</span> <span id="L10" class="LineNr">10 </span><span class="subxComment"># Expected result:</span> <span id="L11" class="LineNr">11 </span><span class="subxComment"># $ echo $?</span> <span id="L12" class="LineNr">12 </span><span class="subxComment"># 97</span> <span id="L13" class="LineNr">13 </span> <span id="L14" class="LineNr">14 </span>== code <span id="L15" class="LineNr">15 </span><span class="subxComment"># instruction effective address register displacement immediate</span> <span id="L16" class="LineNr">16 </span><span class="subxS1Comment"># . op subop mod rm32 base index scale r32</span> <span id="L17" class="LineNr">17 </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="L18" class="LineNr">18 </span> <span id="L19" class="LineNr">19 </span><span class="SpecialChar">Entry</span>: <span id="L20" class="LineNr">20 </span> <span class="subxComment"># creat(Filename)</span> <span id="L21" class="LineNr">21 </span> bb/copy-to-ebx <span class="SpecialChar"><a href='ex7.subx.html#L94'>Filename</a></span>/imm32 <span id="L22" class="LineNr">22 </span> b9/copy-to-ecx 0x180/imm32/fixed-perms <span id="L23" class="LineNr">23 </span> e8/call <a href='000init.subx.html#L53'>syscall_creat</a>/disp32 <span id="L24" class="LineNr">24 </span> <span id="L25" class="LineNr">25 </span> <span class="subxComment"># stream = open(Filename, O_WRONLY, 0) # we can't use 'fd' because it looks like a hex byte</span> <span id="L26" class="LineNr">26 </span> bb/copy-to-ebx <span class="SpecialChar"><a href='ex7.subx.html#L94'>Filename</a></span>/imm32 <span id="L27" class="LineNr">27 </span> b9/copy-to-ecx 1/imm32/wronly <span id="L28" class="LineNr">28 </span> ba/copy-to-edx 0x180/imm32/fixed-perms <span id="L29" class="LineNr">29 </span> e8/call <a href='000init.subx.html#L35'>syscall_open</a>/disp32 <span id="L30" class="LineNr">30 </span> <span class="subxComment"># save stream</span> <span id="L31" class="LineNr">31 </span> bb/copy-to-ebx <span class="SpecialChar"><a href='ex7.subx.html#L88'>Stream</a></span>/imm32 <span id="L32" class="LineNr">32 </span> 89/copy 0/mod/indirect 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="L33" class="LineNr">33 </span> <span id="L34" class="LineNr">34 </span> <span class="subxComment"># write(Stream, "a", 1)</span> <span id="L35" class="LineNr">35 </span> <span class="subxS1Comment"># . load<style>pre { line-height: 125%; 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without even the implied warranty of</span> <span class="c1"># MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the</span> <span class="c1"># GNU General Public License for more details.</span> <span class="c1">#</span> <span class="c1"># You should have received a copy of the GNU General Public License</span> <span class="c1"># along with this program. If not, see <http://www.gnu.org/licenses/>.</span> <span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s1">'__main__'</span><span class="p">:</span> <span class="kn">from</span> <span class="nn">__init__</span> <span class="kn">import</span> <span class="n">init</span><span class="p">;</span> <span class="n">init</span><span class="p">()</span> <span class="kn">import</span> <span class="nn">unittest</span> <span class="kn">from</span> <span class="nn">ranger.ext.direction</span> <span class="kn">import</span> <span class="n">Direction</span> <span class="kn">from</span> <span class="nn">ranger.ext.openstruct</span> <span class="kn">import</span> <span class="n">OpenStruct</span> <span class="k">class</span> <span class="nc">TestDirections</span><span class="p">(</span><span class="n">unittest</span><span class="o">.</span><span class="n">TestCase</span><span class="p">):</span> <span class="k">def</span> <span class="nf">test_symmetry</span><span class="p">(</span><span class="bp">self</span><span