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<a href='https://github.com/akkartik/mu/blob/master/020syscalls.cc'>https://github.com/akkartik/mu/blob/master/020syscalls.cc</a>
<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Delimiter">:(before "End Initialize Op Names")</span>
<span id="L2" class="LineNr"> 2 </span><a href='001help.cc.html#L260'>put_new</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L348'>Name</a></span><span class="Delimiter">,</span> <span class="Constant">"cd"</span><span class="Delimiter">,</span> <span class="Constant">"software interrupt (int)"</span><span class="Delimiter">);</span>
<span id="L3" class="LineNr"> 3 </span>
<span id="L4" class="LineNr"> 4 </span><span class="Delimiter">:(before "End Single-Byte Opcodes")</span>
<span id="L5" class="LineNr"> 5 </span><span class="Normal">case</span> <span class="Constant">0xcd</span>: <span class="Delimiter">{</span> <span class="Comment">// int imm8 (software interrupt)</span>
<span id="L6" class="LineNr"> 6 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"syscall"</span> << end<span class="Delimiter">();</span>
<span id="L7" class="LineNr"> 7 </span> <span class="Normal">uint8_t</span> code = <a href='010---vm.cc.html#L331'>next</a><span class="Delimiter">();</span>
<span id="L8" class="LineNr"> 8 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>code != <span class="Constant">0x80</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L9" class="LineNr"> 9 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"Unimplemented interrupt code "</span> << <a href='010---vm.cc.html#L400'>HEXBYTE</a> << code << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L10" class="LineNr"> 10 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">" Only `int 80h` supported for now.\n"</span> << end<span class="Delimiter">();</span>
<span id="L11" class="LineNr"> 11 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L12" class="LineNr"> 12 </span> <span class="Delimiter">}</span>
<span id="L13" class="LineNr"> 13 </span> <a href='020syscalls.cc.html#L18'>process_int80</a><span class="Delimiter">();</span>
<span id="L14" class="LineNr"> 14 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L15" class="LineNr"> 15 </span><span class="Delimiter">}</span>
<span id="L16" class="LineNr"> 16 </span>
<span id="L17" class="LineNr"> 17 </span><span class="Delimiter">:(code)</span>
<span id="L18" class="LineNr"> 18 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L18'>process_int80</a><span class="Delimiter">()</span> <span class="Delimiter">{</span>
<span id="L19" class="LineNr"> 19 </span> <span class="Normal">switch</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L20" class="LineNr"> 20 </span> <span class="Normal">case</span> <span class="Constant">1</span>:
<span id="L21" class="LineNr"> 21 </span> exit<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">exit code</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L22" class="LineNr"> 22 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L23" class="LineNr"> 23 </span> <span class="Normal">case</span> <span class="Constant">3</span>:
<span id="L24" class="LineNr"> 24 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"read: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L25" class="LineNr"> 25 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = read<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">file descriptor</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">memory buffer</span><span class="Comment">*/</span><a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L26" class="LineNr"> 26 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"read: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L28" class="LineNr"> 28 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L29" class="LineNr"> 29 </span> <span class="Normal">case</span> <span class="Constant">4</span>:
<span id="L30" class="LineNr"> 30 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"write: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L31" class="LineNr"> 31 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L229'>mem_addr_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L32" class="LineNr"> 32 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = write<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">file descriptor</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">memory buffer</span><span class="Comment">*/</span><a href='010---vm.cc.html#L186'>mem_addr_u8</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L33" class="LineNr"> 33 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"write: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L36" class="LineNr"> 36 </span> <span class="Normal">case</span> <span class="Constant">5</span>: <span class="Delimiter">{</span>
<span id="L37" class="LineNr"> 37 </span> <a href='020syscalls.cc.html#L89'>check_flags</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L17'>ECX</a><span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span> <a href='020syscalls.cc.html#L101'>check_mode</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L18'>EDX</a><span class="Delimiter">);</span>
<span id="L39" class="LineNr"> 39 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"open: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L40" class="LineNr"> 40 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = open<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">filename</span><span class="Comment">*/</span><a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">flags</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">,</span> <span class="Comment">/*</span><span class="Comment">mode</span><span class="Comment">*/</span><span class="PreProc">0</span><span class="Constant">640</span><span class="Delimiter">);</span>
<span id="L42" class="LineNr"> 42 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"open: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L45" class="LineNr"> 45 </span> <span class="Delimiter">}</span>
<span id="L46" class="LineNr"> 46 </span> <span class="Normal">case</span> <span class="Constant">6</span>:
<span id="L47" class="LineNr"> 47 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"close: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = close<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">file descriptor</span><span class="Comment">*/</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L49" class="LineNr"> 49 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"close: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L51" class="LineNr"> 51 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L52" class="LineNr"> 52 </span> <span class="Normal">case</span> <span class="Constant">8</span>:
<span id="L53" class="LineNr"> 53 </span> <a href='020syscalls.cc.html#L101'>check_mode</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L17'>ECX</a><span class="Delimiter">);</span>
<span id="L54" class="LineNr"> 54 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"creat: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L55" class="LineNr"> 55 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = creat<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">filename</span><span class="Comment">*/</span><a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">mode</span><span class="Comment">*/</span><span class="PreProc">0</span><span class="Constant">640</span><span class="Delimiter">);</span>
<span id="L57" class="LineNr"> 57 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L58" class="LineNr"> 58 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"creat: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L59" class="LineNr"> 59 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L60" class="LineNr"> 60 </span> <span class="Normal">case</span> <span class="Constant">10</span>:
<span id="L61" class="LineNr"> 61 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"unlink: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L62" class="LineNr"> 62 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = unlink<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">filename</span><span class="Comment">*/</span><a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">));</span>
<span id="L64" class="LineNr"> 64 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L65" class="LineNr"> 65 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"unlink: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L66" class="LineNr"> 66 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Normal">case</span> <span class="Constant">38</span>:
<span id="L68" class="LineNr"> 68 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"rename: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">" -> "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L69" class="LineNr"> 69 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L70" class="LineNr"> 70 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u << <span class="Constant">" => "</span> << <a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << end<span class="Delimiter">();</span>
<span id="L71" class="LineNr"> 71 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i = rename<span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">old filename</span><span class="Comment">*/</span><a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">new filename</span><span class="Comment">*/</span><a href='010---vm.cc.html#L226'>mem_addr_kernel_string</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">));</span>
<span id="L72" class="LineNr"> 72 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i << end<span class="Delimiter">();</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"rename: "</span> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L74" class="LineNr"> 74 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Normal">case</span> <span class="Constant">90</span>: <span class="Comment">// mmap: allocate memory outside existing segment allocations</span>
<span id="L76" class="LineNr"> 76 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"mmap: allocate new segment"</span> << end<span class="Delimiter">();</span>
<span id="L77" class="LineNr"> 77 </span> <span class="Comment">// Ignore most arguments for now: address hint, protection flags, sharing flags, fd, offset.</span>
<span id="L78" class="LineNr"> 78 </span> <span class="Comment">// We only support anonymous maps.</span>
<span id="L79" class="LineNr"> 79 </span> <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>u = <a href='020syscalls.cc.html#L113'>new_segment</a><span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">length</span><span class="Comment">*/</span><a href='010---vm.cc.html#L178'>read_mem_u32</a><span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EBX]<span class="Delimiter">.</span>u+<span class="Constant">0x4</span><span class="Delimiter">));</span>
<span id="L80" class="LineNr"> 80 </span> <a href='003trace.cc.html#L96'>trace</a><span class="Delimiter">(</span><span class="Special">Callstack_depth</span>+<span class="Constant">1</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>u << end<span class="Delimiter">();</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L82" class="LineNr"> 82 </span> <span class="Normal">default</span>:
<span id="L83" class="LineNr"> 83 </span> <a href='003trace.cc.html#L226'>raise</a> << <a href='010---vm.cc.html#L401'>HEXWORD</a> << <a href='010---vm.cc.html#L32'>EIP</a> << <span class="Constant">": unimplemented syscall "</span> << <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[EAX]<span class="Delimiter">.</span>u << <span class="cSpecial">'\n'</span> << end<span class="Delimiter">();</span>
<span id="L84" class="LineNr"> 84 </span> <span class="Delimiter">}</span>
<span id="L85" class="LineNr"> 85 </span><span class="Delimiter">}</span>
<span id="L86" class="LineNr"> 86 </span>
<span id="L87" class="LineNr"> 87 </span><span class="Comment">// SubX is oblivious to file permissions, directories, symbolic links, terminals, and much else besides.</span>
<span id="L88" class="LineNr"> 88 </span><span class="Comment">// Also ignoring any concurrency considerations for now.</span>
<span id="L89" class="LineNr"> 89 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L89'>check_flags</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='010---vm.cc.html#L26'>reg</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L90" class="LineNr"> 90 </span> <span class="Normal">uint32_t</span> flags = <span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[reg]<span class="Delimiter">.</span>u<span class="Delimiter">;</span>
<span id="L91" class="LineNr"> 91 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>flags != <span class="Delimiter">((</span>flags & O_RDONLY<span class="Delimiter">)</span> | <span class="Delimiter">(</span>flags & O_WRONLY<span class="Delimiter">)))</span> <span class="Delimiter">{</span>
<span id="L92" class="LineNr"> 92 </span> cerr << <a href='010---vm.cc.html#L401'>HEXWORD</a> << <a href='010---vm.cc.html#L32'>EIP</a> << <span class="Constant">": most POSIX flags to the open() syscall are not supported. Just O_RDONLY and O_WRONLY for now. Zero concurrent access support.\n"</span><span class="Delimiter">;</span>
<span id="L93" class="LineNr"> 93 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L94" class="LineNr"> 94 </span> <span class="Delimiter">}</span>
<span id="L95" class="LineNr"> 95 </span> <span class="Normal">if</span> <span class="Delimiter">((</span>flags & O_RDONLY<span class="Delimiter">)</span> && <span class="Delimiter">(</span>flags & O_WRONLY<span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L96" class="LineNr"> 96 </span> cerr << <a href='010---vm.cc.html#L401'>HEXWORD</a> << <a href='010---vm.cc.html#L32'>EIP</a> << <span class="Constant">": can't open a file for both reading and writing at once. See <a href="http://man7.org/linux/man-pages/man2/open.2.html">http://man7.org/linux/man-pages/man2/open.2.html</a>.\n"</span><span class="Delimiter">;</span>
<span id="L97" class="LineNr"> 97 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L98" class="LineNr"> 98 </span> <span class="Delimiter">}</span>
<span id="L99" class="LineNr"> 99 </span><span class="Delimiter">}</span>
<span id="L100" class="LineNr">100 </span>
<span id="L101" class="LineNr">101 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L101'>check_mode</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='010---vm.cc.html#L26'>reg</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L102" class="LineNr">102 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Special"><a href='010---vm.cc.html#L31'>Reg</a></span>[reg]<span class="Delimiter">.</span>u != <span class="PreProc">0</span><span class="Constant">600</span><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L103" class="LineNr">103 </span> cerr << <a href='010---vm.cc.html#L401'>HEXWORD</a> << <a href='010---vm.cc.html#L32'>EIP</a> << <span class="Constant">": SubX is oblivious to file permissions; register "</span> << <a href='010---vm.cc.html#L26'>reg</a> << <span class="Constant">" must be 0.\n"</span><span class="Delimiter">;</span>
<span id="L104" class="LineNr">104 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L105" class="LineNr">105 </span> <span class="Delimiter">}</span>
<span id="L106" class="LineNr">106 </span><span class="Delimiter">}</span>
<span id="L107" class="LineNr">107 </span>
<span id="L108" class="LineNr">108 </span><span class="Delimiter">:(before "End Globals")</span>
<span id="L109" class="LineNr">109 </span><span class="Comment">// Very primitive/fixed/insecure mmap segments for now.</span>
<span id="L110" class="LineNr">110 </span><span class="Normal">uint32_t</span> <span class="Special"><a href='020syscalls.cc.html#L110'>Segments_allocated_above</a></span> = <a href='012elf.cc.html#L149'>END_HEAP</a><span class="Delimiter">;</span>
<span id="L111" class="LineNr">111 </span><span class="Delimiter">:(code)</span>
<span id="L112" class="LineNr">112 </span><span class="Comment">// always allocate multiples of the segment size</span>
<span id="L113" class="LineNr">113 </span><span class="Normal">uint32_t</span> <a href='020syscalls.cc.html#L113'>new_segment</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> length<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L114" class="LineNr">114 </span> assert<span class="Delimiter">(</span>length > <span class="Constant">0</span><span class="Delimiter">);</span>
<span id="L115" class="LineNr">115 </span> <span class="Normal">uint32_t</span> result = <span class="Delimiter">(</span><span class="Special"><a href='020syscalls.cc.html#L110'>Segments_allocated_above</a></span> - length<span class="Delimiter">)</span> & <span class="Constant">0xff000000</span><span class="Delimiter">;</span> <span class="Comment">// same number of zeroes as SEGMENT_ALIGNMENT</span>
<span id="L116" class="LineNr">116 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>result <= <a href='012elf.cc.html#L148'>START_HEAP</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L117" class="LineNr">117 </span> <a href='003trace.cc.html#L226'>raise</a> << <span class="Constant">"Allocated too many segments; the VM ran out of memory. "</span>
<span id="L118" class="LineNr">118 </span> << <span class="Constant">"Maybe <a href='010---vm.cc.html#L95'>SEGMENT_ALIGNMENT</a> can be smaller?\n"</span> << <a href='003trace.cc.html#L173'>die</a><span class="Delimiter">();</span>
<span id="L119" class="LineNr">119 </span> <span class="Delimiter">}</span>
<span id="L120" class="LineNr">120 </span> <span class="Special"><a href='010---vm.cc.html#L160'>Mem</a></span><span class="Delimiter">.</span>push_back<span class="Delimiter">(</span>vma<span class="Delimiter">(</span>result<span class="Delimiter">,</span> result+length<span class="Delimiter">));</span>
<span id="L121" class="LineNr">121 </span> <span class="Special"><a href='020syscalls.cc.html#L110'>Segments_allocated_above</a></span> = result<span class="Delimiter">;</span>
<span id="L122" class="LineNr">122 </span> <span class="Identifier">return</span> result<span class="Delimiter">;</span>
<span id="L123" class="LineNr">123 </span><span class="Delimiter">}</span>
</pre>
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