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<pre id='vimCodeElement'>
<span id="L1" class="LineNr"> 1 </span><span class="Comment">// <a href="https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c">https://github.com/kragen/stoneknifeforth/blob/702d2ebe1b/386.c</a></span>
<span id="L2" class="LineNr"> 2 </span>
<span id="L3" class="LineNr"> 3 </span><span class="Delimiter">:(before "End Main")</span>
<span id="L4" class="LineNr"> 4 </span>assert<span class="Delimiter">(</span>argc > <span class="Constant">1</span><span class="Delimiter">);</span>
<span id="L5" class="LineNr"> 5 </span><a href='000organization.cc.html#L139'>reset</a><span class="Delimiter">();</span>
<span id="L6" class="LineNr"> 6 </span><a href='020elf.cc.html#L11'>load_elf</a><span class="Delimiter">(</span>argv[<span class="Constant">1</span>]<span class="Delimiter">);</span>
<span id="L7" class="LineNr"> 7 </span><span class="Normal">while</span> <span class="Delimiter">(</span><a href='010core.cc.html#L23'>EIP</a> < <a href='010core.cc.html#L68'>End_of_program</a><span class="Delimiter">)</span>
<span id="L8" class="LineNr"> 8 </span> <a href='010core.cc.html#L109'>run_one_instruction</a><span class="Delimiter">();</span>
<span id="L9" class="LineNr"> 9 </span>
<span id="L10" class="LineNr">10 </span><span class="Delimiter">:(code)</span>
<span id="L11" class="LineNr">11 </span><span class="Normal">void</span> <a href='020elf.cc.html#L11'>load_elf</a><span class="Delimiter">(</span><span class="Normal">const</span> string& filename<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L12" class="LineNr">12 </span> <span class="Normal">int</span> fd = open<span class="Delimiter">(</span>filename<span class="Delimiter">.</span>c_str<span class="Delimiter">(),</span> O_RDONLY<span class="Delimiter">);</span>
<span id="L13" class="LineNr">13 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>fd < <span class="Constant">0</span><span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"</span><span class="cSpecial">%s</span><span class="Constant">: open"</span><span class="Delimiter">,</span> filename<span class="Delimiter">.</span>c_str<span class="Delimiter">());</span>
<span id="L14" class="LineNr">14 </span> <span class="Normal">off_t</span> size = lseek<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">SEEK_END</span><span class="Delimiter">);</span>
<span id="L15" class="LineNr">15 </span> lseek<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> <span class="Constant">0</span><span class="Delimiter">,</span> <span class="Constant">SEEK_SET</span><span class="Delimiter">);</span>
<span id="L16" class="LineNr">16 </span> <span class="Normal">uint8_t</span>* elf_contents = <span class="Normal">static_cast</span><<span class="Normal">uint8_t</span>*><span class="Delimiter">(</span>malloc<span class="Delimiter">(</span>size<span class="Delimiter">));</span>
<span id="L17" class="LineNr">17 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>elf_contents == <span class="Constant">NULL</span><span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"malloc(</span><span class="cSpecial">%d</span><span class="Constant">)"</span><span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L18" class="LineNr">18 </span> <span class="Normal">ssize_t</span> read_size = read<span class="Delimiter">(</span>fd<span class="Delimiter">,</span> elf_contents<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L19" class="LineNr">19 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>size != read_size<span class="Delimiter">)</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"read → </span><span class="cSpecial">%d</span><span class="Constant"> (!= </span><span class="cSpecial">%d</span><span class="Constant">)"</span><span class="Delimiter">,</span> size<span class="Delimiter">,</span> read_size<span class="Delimiter">);</span>
<span id="L20" class="LineNr">20 </span> <a href='020elf.cc.html#L24'>load_elf_contents</a><span class="Delimiter">(</span>elf_contents<span class="Delimiter">,</span> size<span class="Delimiter">);</span>
<span id="L21" class="LineNr">21 </span> free<span class="Delimiter">(</span>elf_contents<span class="Delimiter">);</span>
<span id="L22" class="LineNr">22 </span><span class="Delimiter">}</span>
<span id="L23" class="LineNr">23 </span>
<span id="L24" class="LineNr">24 </span><span class="Normal">void</span> <a href='020elf.cc.html#L24'>load_elf_contents</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span>* elf_contents<span class="Delimiter">,</span> <span class="Normal">size_t</span> length<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L25" class="LineNr">25 </span> <span class="Normal">uint8_t</span> magic[<span class="Constant">5</span>] = <span class="Delimiter">{</span><span class="Constant">0</span><span class="Delimiter">};</span>
<span id="L26" class="LineNr">26 </span> memcpy<span class="Delimiter">(</span>magic<span class="Delimiter">,</span> elf_contents<span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">);</span>
<span id="L27" class="LineNr">27 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Constant">0</span> != memcmp<span class="Delimiter">(</span>magic<span class="Delimiter">,</span> <span class="Constant">"</span><span class="cSpecial">\177</span><span class="Constant">ELF"</span><span class="Delimiter">,</span> <span class="Constant">4</span><span class="Delimiter">))</span>
<span id="L28" class="LineNr">28 </span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"Invalid ELF file starting with </span><span class="cSpecial">\"</span><span class="cSpecial">%s</span><span class="cSpecial">\"</span><span class="Constant">"</span><span class="Delimiter">,</span> magic<span class="Delimiter">);</span>
<span id="L29" class="LineNr">29 </span>
<span id="L30" class="LineNr">30 </span> <span class="Normal">uint32_t</span> e_type = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">16</span>]<span class="Delimiter">);</span>
<span id="L31" class="LineNr">31 </span> <span class="Normal">if</span> <span class="Delimiter">(</span><span class="Constant">0x00030002</span> != e_type<span class="Delimiter">)</span>
<span id="L32" class="LineNr">32 </span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Constant">"ELF type/machine 0x</span><span class="cSpecial">%x</span><span class="Constant"> isn't i386 executable"</span><span class="Delimiter">,</span> e_type<span class="Delimiter">);</span>
<span id="L33" class="LineNr">33 </span>
<span id="L34" class="LineNr">34 </span> <span class="Normal">uint32_t</span> e_entry = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">24</span>]<span class="Delimiter">);</span>
<span id="L35" class="LineNr">35 </span> <span class="Normal">uint32_t</span> e_phoff = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[<span class="Constant">28</span>]<span class="Delimiter">);</span>
<span id="L36" class="LineNr">36 </span> <span class="Normal">uint32_t</span> p_vaddr = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[e_phoff + <span class="Constant">8</span>]<span class="Delimiter">);</span>
<span id="L37" class="LineNr">37 </span> <span class="Normal">uint32_t</span> p_memsz = <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span>&elf_contents[e_phoff + <span class="Constant">20</span>]<span class="Delimiter">);</span>
<span id="L38" class="LineNr">38 </span>
<span id="L39" class="LineNr">39 </span> <a href='010core.cc.html#L67'>Mem</a><span class="Delimiter">.</span>resize<span class="Delimiter">(</span>p_memsz<span class="Delimiter">);</span> <span class="Comment">// </span><span class="Todo">TODO</span><span class="Comment">: not sure if this should be + p_vaddr</span>
<span id="L40" class="LineNr">40 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>length > p_memsz - p_vaddr<span class="Delimiter">)</span> length = p_memsz - p_vaddr<span class="Delimiter">;</span>
<span id="L41" class="LineNr">41 </span> <span class="Normal">for</span> <span class="Delimiter">(</span><span class="Normal">size_t</span> i = <span class="Constant">0</span><span class="Delimiter">;</span> i < length<span class="Delimiter">;</span> ++i<span class="Delimiter">)</span>
<span id="L42" class="LineNr">42 </span> <a href='010core.cc.html#L67'>Mem</a><span class="Delimiter">.</span>at<span class="Delimiter">(</span>p_vaddr + i<span class="Delimiter">)</span> = elf_contents[i]<span class="Delimiter">;</span>
<span id="L43" class="LineNr">43 </span> <a href='010core.cc.html#L68'>End_of_program</a> = p_memsz<span class="Delimiter">;</span>
<span id="L44" class="LineNr">44 </span>
<span id="L45" class="LineNr">45 </span> <span class="Comment">// </span><span class="Todo">TODO</span><span class="Comment">: need to set up real stack somewhere</span>
<span id="L46" class="LineNr">46 </span>
<span id="L47" class="LineNr">47 </span> Reg[ESP]<span class="Delimiter">.</span>u = Reg[EBP]<span class="Delimiter">.</span>u = <a href='010core.cc.html#L68'>End_of_program</a><span class="Delimiter">;</span>
<span id="L48" class="LineNr">48 </span> <a href='010core.cc.html#L23'>EIP</a> = e_entry<span class="Delimiter">;</span>
<span id="L49" class="LineNr">49 </span><span class="Delimiter">}</span>
<span id="L50" class="LineNr">50 </span>
<span id="L51" class="LineNr">51 </span><span class="Normal">inline</span> <span class="Normal">uint32_t</span> <a href='020elf.cc.html#L51'>u32_in</a><span class="Delimiter">(</span><span class="Normal">uint8_t</span>* p<span class="Delimiter">)</span> <span class="Delimiter">{</span>
<span id="L52" class="LineNr">52 </span> <span class="Identifier">return</span> p[<span class="Constant">0</span>] | p[<span class="Constant">1</span>] << <span class="Constant">8</span> | p[<span class="Constant">2</span>] << <span class="Constant">16</span> | p[<span class="Constant">3</span>] << <span class="Constant">24</span><span class="Delimiter">;</span>
<span id="L53" class="LineNr">53 </span><span class="Delimiter">}</span>
<span id="L54" class="LineNr">54 </span>
<span id="L55" class="LineNr">55 </span><span class="Normal">void</span> <a href='020elf.cc.html#L55'>die</a><span class="Delimiter">(</span><span class="Normal">const</span> <span class="Normal">char</span>* format<span class="Delimiter">,</span> <span class="Delimiter">...)</span> <span class="Delimiter">{</span>
<span id="L56" class="LineNr">56 </span> <span class="Normal">va_list</span> args<span class="Delimiter">;</span>
<span id="L57" class="LineNr">57 </span> va_start<span class="Delimiter">(</span>args<span class="Delimiter">,</span> format<span class="Delimiter">);</span>
<span id="L58" class="LineNr">58 </span> vfprintf<span class="Delimiter">(</span><span class="Constant">stderr</span><span class="Delimiter">,</span> format<span class="Delimiter">,</span> args<span class="Delimiter">);</span>
<span id="L59" class="LineNr">59 </span> <span class="Normal">if</span> <span class="Delimiter">(</span>errno<span class="Delimiter">)</span>
<span id="L60" class="LineNr">60 </span> perror<span class="Delimiter">(</span><span class="Constant">"<200c>"</span><span class="Delimiter">);</span>
<span id="L61" class="LineNr">61 </span> <span class="Normal">else</span>
<span id="L62" class="LineNr">62 </span> fprintf<span class="Delimiter">(</span><span class="Constant">stderr</span><span class="Delimiter">,</span> <span class="Constant">"</span><span class="cSpecial">\n</span><span class="Constant">"</span><span class="Delimiter">);</span>
<span id="L63" class="LineNr">63 </span> va_end<span class="Delimiter">(</span>args<span class="Delimiter">);</span>
<span id="L64" class="LineNr">64 </span> abort<span class="Delimiter">();</span>
<span id="L65" class="LineNr">65 </span><span class="Delimiter">}</span>
<span id="L66" class="LineNr">66 </span>
<span id="L67" class="LineNr">67 </span><span class="Delimiter">:(before "End Types")</span>
<span id="L68" class="LineNr">68 </span><span class="PreProc">#include </span><span class="Constant"><sys/types.h></span>
<span id="L69" class="LineNr">69 </span><span class="PreProc">#include </span><span class="Constant"><sys/stat.h></span>
<span id="L70" class="LineNr">70 </span><span class="PreProc">#include </span><span class="Constant"><fcntl.h></span>
<span id="L71" class="LineNr">71 </span><span class="PreProc">#include </span><span class="Constant"><unistd.h></span>
<span id="L72" class="LineNr">72 </span><span class="PreProc">#include </span><span class="Constant"><stdarg.h></span>
<span id="L73" class="LineNr">73 </span><span class="PreProc">#include </span><span class="Constant"><errno.h></span>
</pre>
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