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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Delimiter">:(before "End Initialize Op Names(name)")</span>
<span id="L2" class="LineNr"> 2 </span><a href='001help.cc.html#L243'>put</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L228'>name</a><span class="Delimiter">,</span> <span class="Constant">"cd"</span><span class="Delimiter">,</span> <span class="Constant">"software interrupt"</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#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">90</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"syscall"</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L7" class="LineNr"> 7 </span> <span class="Normal">uint8_t</span> <a href='031check_operands.cc.html#L14'>code</a> = <a href='010---vm.cc.html#L214'>next</a><span class="Delimiter">();</span>
<span id="L8" class="LineNr"> 8 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><a href='031check_operands.cc.html#L14'>code</a> != <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#L203'>raise</a> << <span class="Constant">"Unimplemented interrupt <a href='031check_operands.cc.html#L14'>code</a> "</span> << <a href='010---vm.cc.html#L259'>HEXBYTE</a> << <a href='031check_operands.cc.html#L14'>code</a> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L10" class="LineNr"> 10 </span> <a href='003trace.cc.html#L203'>raise</a> << <span class="Constant">" Only `int 80h` supported for now.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L222'>end</a><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>Reg[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 <a href='031check_operands.cc.html#L14'>code</a></span><span class="Comment">*/</span>Reg[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#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"read: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << Reg[ECX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <span class="Constant">' '</span> << Reg[EDX]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L25" class="LineNr"> 25 </span> Reg[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>Reg[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#L117'>mem_addr_u8</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span>Reg[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L26" class="LineNr"> 26 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L27" class="LineNr"> 27 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><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#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"write: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">' '</span> << Reg[ECX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <span class="Constant">' '</span> << Reg[EDX]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L31" class="LineNr"> 31 </span> Reg[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>Reg[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#L117'>mem_addr_u8</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">size</span><span class="Comment">*/</span>Reg[EDX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L32" class="LineNr"> 32 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L33" class="LineNr"> 33 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L34" class="LineNr"> 34 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L35" class="LineNr"> 35 </span> <span class="Normal">case</span> <span class="Constant">5</span>: <span class="Delimiter">{</span>
<span id="L36" class="LineNr"> 36 </span> <a href='020syscalls.cc.html#L80'>check_flags</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L14'>ECX</a><span class="Delimiter">);</span>
<span id="L37" class="LineNr"> 37 </span> <a href='020syscalls.cc.html#L92'>check_mode</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L15'>EDX</a><span class="Delimiter">);</span>
<span id="L38" class="LineNr"> 38 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"open: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <span class="Constant">' '</span> << Reg[ECX]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L39" class="LineNr"> 39 </span> Reg[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#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">),</span> <span class="Comment">/*</span><span class="Comment">flags</span><span class="Comment">*/</span>Reg[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="L40" class="LineNr"> 40 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L41" class="LineNr"> 41 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L42" class="LineNr"> 42 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L43" class="LineNr"> 43 </span> <span class="Delimiter">}</span>
<span id="L44" class="LineNr"> 44 </span> <span class="Normal">case</span> <span class="Constant">6</span>:
<span id="L45" class="LineNr"> 45 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"close: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L46" class="LineNr"> 46 </span> Reg[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>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L47" class="LineNr"> 47 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L48" class="LineNr"> 48 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L49" class="LineNr"> 49 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L50" class="LineNr"> 50 </span> <span class="Normal">case</span> <span class="Constant">8</span>:
<span id="L51" class="LineNr"> 51 </span> <a href='020syscalls.cc.html#L92'>check_mode</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L14'>ECX</a><span class="Delimiter">);</span>
<span id="L52" class="LineNr"> 52 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"creat: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L53" class="LineNr"> 53 </span> Reg[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#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[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="L54" class="LineNr"> 54 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L55" class="LineNr"> 55 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L56" class="LineNr"> 56 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L57" class="LineNr"> 57 </span> <span class="Normal">case</span> <span class="Constant">10</span>:
<span id="L58" class="LineNr"> 58 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"unlink: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L59" class="LineNr"> 59 </span> Reg[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#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">));</span>
<span id="L60" class="LineNr"> 60 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L61" class="LineNr"> 61 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L62" class="LineNr"> 62 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L63" class="LineNr"> 63 </span> <span class="Normal">case</span> <span class="Constant">38</span>:
<span id="L64" class="LineNr"> 64 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"rename: "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <span class="Constant">" -> "</span> << Reg[ECX]<span class="Delimiter">.</span>u << <span class="Constant">'/'</span> << <a href='010---vm.cc.html#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">)</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L65" class="LineNr"> 65 </span> Reg[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#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[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#L123'>mem_addr_string</a><span class="Delimiter">(</span>Reg[ECX]<span class="Delimiter">.</span>u<span class="Delimiter">));</span>
<span id="L66" class="LineNr"> 66 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"result: "</span> << Reg[EAX]<span class="Delimiter">.</span>i << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L67" class="LineNr"> 67 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[EAX]<span class="Delimiter">.</span>i == -<span class="Constant">1</span><span class="Delimiter">)</span> <a href='003trace.cc.html#L203'>raise</a> << strerror<span class="Delimiter">(</span>errno<span class="Delimiter">)</span> << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L68" class="LineNr"> 68 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L69" class="LineNr"> 69 </span> <span class="Normal">case</span> <span class="Constant">45</span>: <span class="Comment">// brk: modify size of data segment</span>
<span id="L70" class="LineNr"> 70 </span> <a href='003trace.cc.html#L196'>trace</a><span class="Delimiter">(</span><span class="Constant">91</span><span class="Delimiter">,</span> <span class="Constant">"run"</span><span class="Delimiter">)</span> << <span class="Constant">"grow <a href='011run.cc.html#L122'>data</a> segment to "</span> << Reg[EBX]<span class="Delimiter">.</span>u << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L71" class="LineNr"> 71 </span> <a href='020syscalls.cc.html#L99'>resize_mem</a><span class="Delimiter">(</span><span class="Comment">/*</span><span class="Comment">new <a href='003trace.cc.html#L222'>end</a> address</span><span class="Comment">*/</span>Reg[EBX]<span class="Delimiter">.</span>u<span class="Delimiter">);</span>
<span id="L72" class="LineNr"> 72 </span> <span class="Identifier">break</span><span class="Delimiter">;</span>
<span id="L73" class="LineNr"> 73 </span> <span class="Normal">default</span>:
<span id="L74" class="LineNr"> 74 </span> <a href='003trace.cc.html#L203'>raise</a> << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>EIP</a> << <span class="Constant">": unimplemented syscall "</span> << Reg[EAX]<span class="Delimiter">.</span>u << <span class="cSpecial">'\n'</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L75" class="LineNr"> 75 </span> <span class="Delimiter">}</span>
<span id="L76" class="LineNr"> 76 </span><span class="Delimiter">}</span>
<span id="L77" class="LineNr"> 77 </span>
<span id="L78" class="LineNr"> 78 </span><span class="Comment">// SubX is oblivious to file permissions, directories, symbolic links, terminals, and much else besides.</span>
<span id="L79" class="LineNr"> 79 </span><span class="Comment">// Also ignoring any concurrency considerations for now.</span>
<span id="L80" class="LineNr"> 80 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L80'>check_flags</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='010---vm.cc.html#L23'>reg</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L81" class="LineNr"> 81 </span> <span class="Normal">uint32_t</span> flags = Reg[reg]<span class="Delimiter">.</span>u<span class="Delimiter">;</span>
<span id="L82" class="LineNr"> 82 </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="L83" class="LineNr"> 83 </span> cerr << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>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.</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L84" class="LineNr"> 84 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L85" class="LineNr"> 85 </span> <span class="Delimiter">}</span>
<span id="L86" class="LineNr"> 86 </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="L87" class="LineNr"> 87 </span> cerr << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>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></span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L88" class="LineNr"> 88 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L89" class="LineNr"> 89 </span> <span class="Delimiter">}</span>
<span id="L90" class="LineNr"> 90 </span><span class="Delimiter">}</span>
<span id="L91" class="LineNr"> 91 </span>
<span id="L92" class="LineNr"> 92 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L92'>check_mode</a><span class="Delimiter">(</span><span class="Normal">int</span> <a href='010---vm.cc.html#L23'>reg</a><span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L93" class="LineNr"> 93 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>Reg[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="L94" class="LineNr"> 94 </span> cerr << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>EIP</a> << <span class="Constant">": SubX is oblivious to file permissions; register "</span> << <a href='010---vm.cc.html#L23'>reg</a> << <span class="Constant">" must be 0.</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L95" class="LineNr"> 95 </span> exit<span class="Delimiter">(</span><span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L96" class="LineNr"> 96 </span> <span class="Delimiter">}</span>
<span id="L97" class="LineNr"> 97 </span><span class="Delimiter">}</span>
<span id="L98" class="LineNr"> 98 </span>
<span id="L99" class="LineNr"> 99 </span><span class="Normal">void</span> <a href='020syscalls.cc.html#L99'>resize_mem</a><span class="Delimiter">(</span><span class="Normal">uint32_t</span> new_end_address<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L100" class="LineNr">100 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_end_address < Mem_offset<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L101" class="LineNr">101 </span> <a href='003trace.cc.html#L203'>raise</a> << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>EIP</a> << <span class="Constant">": can't shrink data segment to before code segment</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">;</span>
<span id="L102" class="LineNr">102 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L103" class="LineNr">103 </span> <span class="Delimiter">}</span>
<span id="L104" class="LineNr">104 </span> <span class="Normal">int32_t</span> new_size = new_end_address - Mem_offset<span class="Delimiter">;</span>
<span id="L105" class="LineNr">105 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>new_size < <a href='001help.cc.html#L157'>SIZE</a><span class="Delimiter">(</span><a href='010---vm.cc.html#L93'>Mem</a><span class="Delimiter">))</span> <span class="Delimiter">{</span>
<span id="L106" class="LineNr">106 </span> <a href='003trace.cc.html#L203'>raise</a> << <a href='010---vm.cc.html#L260'>HEXWORD</a> << <a href='010---vm.cc.html#L29'>EIP</a> << <span class="Constant">": shrinking <a href='011run.cc.html#L122'>data</a> segment is not supported.</span><span class="cSpecial">\n</span><span class="Constant">"</span> << <a href='003trace.cc.html#L222'>end</a><span class="Delimiter">();</span>
<span id="L107" class="LineNr">107 </span> <span class="Identifier">return</span><span class="Delimiter">;</span>
<span id="L108" class="LineNr">108 </span> <span class="Delimiter">}</span>
<span id="L109" class="LineNr">109 </span> <a href='010---vm.cc.html#L93'>Mem</a><span class="Delimiter">.</span>resize<span class="Delimiter">(</span>new_size<span class="Delimiter">);</span> <span class="Comment">// will throw exception on failure</span>
<span id="L110" class="LineNr">110 </span><span class="Delimiter">}</span>
</pre>
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