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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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<title>Mu - apps/ex12.subx</title>
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a { color:inherit; }
* { font-size:12pt; font-size: 1em; }
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<a href='https://github.com/akkartik/mu/blob/master/apps/ex12.subx'>https://github.com/akkartik/mu/blob/master/apps/ex12.subx</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="subxComment"># Example showing mmap syscall.</span>
<span id="L2" class="LineNr"> 2 </span><span class="subxComment"># Create a new segment using mmap, save the address, write to it.</span>
<span id="L3" class="LineNr"> 3 </span><span class="subxComment">#</span>
<span id="L4" class="LineNr"> 4 </span><span class="subxComment"># To run:</span>
<span id="L5" class="LineNr"> 5 </span><span class="subxComment">#   $ ./bootstrap translate init.linux apps/ex12.subx -o apps/ex12</span>
<span id="L6" class="LineNr"> 6 </span><span class="subxComment">#   $ ./bootstrap run apps/ex12</span>
<span id="L7" class="LineNr"> 7 </span><span class="subxComment"># You shouldn't get a segmentation fault.</span>
<span id="L8" class="LineNr"> 8 </span>
<span id="L9" class="LineNr"> 9 </span>== code
<span id="L10" class="LineNr">10 </span><span class="subxComment">#   instruction                     effective address                                                   register    displacement    immediate</span>
<span id="L11" class="LineNr">11 </span><span class="subxS1Comment"># . op          subop               mod             rm32          base        index         scale       r32</span>
<span id="L12" class="LineNr">12 </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="L13" class="LineNr">13 </span>
<span id="L14" class="LineNr">14 </span><span class="SpecialChar">Entry</span>:
<span id="L15" class="LineNr">15 </span>    <span class="subxComment"># mmap(Mmap-new-segment-&gt;len)</span>
<span id="L16" class="LineNr">16 </span>    bb/copy-to-ebx  <span class="SpecialChar"><a href='ex12.subx.html#L29'>Mmap-new-segment</a></span>/imm32
<span id="L17" class="LineNr">17 </span>    e8/call  syscall_mmap/disp32
<span id="L18" class="LineNr">18 </span>
<span id="L19" class="LineNr">19 </span>    <span class="subxComment"># write to *eax to check that we have access to the newly-allocated segment</span>
<span id="L20" class="LineNr">20 </span>    c7          0/subop/copy        0/mod/direct    0/rm32/eax   <span class="Normal"> . </span>         <span class="Normal"> . </span>           <span class="Normal"> . </span>         <span class="Normal"> . </span>         <span class="Normal"> . </span>              0x34/imm32        <span class="subxComment"># copy to *eax</span>
<span id="L21" class="LineNr">21 </span>
<span id="L22" class="LineNr">22 </span>    <span class="subxComment"># exit(eax)</span>
<span id="L23" class="LineNr">23 </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="L24" class="LineNr">24 </span>    e8/call  syscall_exit/disp32
<span id="L25" class="LineNr">25 </span>
<span id="L26" class="LineNr">26 </span>== data
<span id="L27" class="LineNr">27 </span>
<span id="L28" class="LineNr">28 </span><span class="subxComment"># various constants used here were found in the Linux sources (search for file mman-common.h)</span>
<span id="L29" class="LineNr">29 </span><span class="SpecialChar">Mmap-new-segment</span>:  <span class="subxComment"># type mmap_arg_struct</span>
<span id="L30" class="LineNr">30 </span>    <span class="subxComment"># addr</span>
<span id="L31" class="LineNr">31 </span>    0/imm32
<span id="L32" class="LineNr">32 </span>    <span class="subxComment"># len</span>
<span id="L33" class="LineNr">33 </span>    0x100/imm32
<span id="L34" class="LineNr">34 </span>    <span class="subxComment"># protection flags</span>
<span id="L35" class="LineNr">35 </span>    3/imm32  <span class="subxComment"># PROT_READ | PROT_WRITE</span>
<span id="L36" class="LineNr">36 </span>    <span class="subxComment"># sharing flags</span>
<span id="L37" class="LineNr">37 </span>    0x22/imm32  <span class="subxComment"># MAP_PRIVATE | MAP_ANONYMOUS</span>
<span id="L38" class="LineNr">38 </span>    <span class="subxComment"># fd</span>
<span id="L39" class="LineNr">39 </span>    -1/imm32  <span class="subxComment"># since MAP_ANONYMOUS is specified</span>
<span id="L40" class="LineNr">40 </span>    <span class="subxComment"># offset</span>
<span id="L41" class="LineNr">41 </span>    0/imm32  <span class="subxComment"># since MAP_ANONYMOUS is specified</span>
<span id="L42" class="LineNr">42 </span>
<span id="L43" class="LineNr">43 </span><span class="subxS2Comment"># . . vim&#0058;nowrap:textwidth=0</span>
</pre>
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generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-10-18 17:50:20 +0000
1] + right_part self.pos = i + 1 else: left_part = self.line[:self.pos] i = self.pos + 1 while i < len(self.line) and re.match(r'[\w\d]', self.line[i], re.U): i += 1 self.copy = self.line[self.pos:i] if i >= len(self.line): self.line = left_part self.pos = len(self.line) else: self.line = left_part + self.line[i:] self.pos = len(left_part) self.on_line_change() def delete(self, mod): self.tab_deque = None if mod == -1 and self.pos == 0: if not self.line: self.close(trigger_cancel_function=False) return # Delete utf-char-wise if self.fm.py3: left_part = self.line[:self.pos + mod] self.pos = len(left_part) self.line = left_part + self.line[self.pos + 1:] else: uc = list(self.line.decode('utf-8', 'ignore')) upos = len(self.line[:self.pos].decode('utf-8', 'ignore')) + mod left_part = ''.join(uc[:upos]).encode('utf-8', 'ignore') self.pos = len(left_part) self.line = left_part + ''.join(uc[upos+1:]).encode('utf-8', 'ignore') self.on_line_change() def execute(self, cmd=None): if self.question_queue and cmd is None: question = self.question_queue[0] answers = question[2] if len(answers) >= 1: self._answer_question(answers[0]) else: self.question_queue.pop(0) return self.allow_close = True self.fm.execute_console(self.line) if self.allow_close: self._close_command_prompt(trigger_cancel_function=False) def _get_cmd(self, quiet=False): try: command_class = self._get_cmd_class() except KeyError: if not quiet: error = "Command not found: `%s'" % self.line.split()[0] self.fm.notify(error, bad=True) except: return None else: return command_class(self.line) def _get_cmd_class(self): return self.fm.commands.get_command(self.line.split()[0]) def _get_tab(self): if ' ' in self.line: cmd = self._get_cmd() if cmd: return cmd.tab() else: return None return self.fm.commands.command_generator(self.line) def tab(self, n=1): if self.tab_deque is None: tab_result = self._get_tab() if isinstance(tab_result, str): self.line = tab_result self.pos = len(tab_result) self.on_line_change() elif tab_result == None: pass elif hasattr(tab_result, '__iter__'): self.tab_deque = deque(tab_result) self.tab_deque.appendleft(self.line) if self.tab_deque is not None: self.tab_deque.rotate(-n) self.line = self.tab_deque[0] self.pos = len(self.line) self.on_line_change() def on_line_change(self): self.history_search_pattern = self.line try: cls = self._get_cmd_class() except (KeyError, ValueError, IndexError): pass else: cmd = cls(self.line) if cmd and cmd.quick(): self.execute(cmd) def ask(self, text, callback, choices=['y', 'n']): """ Open a question prompt with predefined choices The "text" is displayed as the question text and should include a list of possible keys that the user can type. The "callback" is a function that is called when the question is answered. It only gets the answer as an argument. "choices" is a tuple of one-letter strings that can be typed in by the user. Every other input gets ignored, except <Enter> and <ESC>. The first choice is used when the user presses <Enter>, the second choice is used when the user presses <ESC>. """ self.question_queue.append((text, callback, choices))
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-10-18 17:50:14 +0000