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fixed up the doxygen, its good now.
2 years ago
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<a href="../../d9/db4/jcc__rewrite__pass_8cpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">// Copyright (c) 2022, _xeroxz</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment">// All rights reserved.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment">//</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment">// Redistribution and use in source and binary forms, with or without</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment">// modification, are permitted provided that the following conditions are met:</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment">//</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment">// 1. Redistributions of source code must retain the above copyright notice,</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment">// this list of conditions and the following disclaimer.</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment">//</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment">// 2. Redistributions in binary form must reproduce the above copyright notice,</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment">// this list of conditions and the following disclaimer in the documentation</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment">// and/or other materials provided with the distribution.</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment">//</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment">// 3. Neither the name of the copyright holder nor the names of its</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment">// contributors may be used to endorse or promote products derived from</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment">// this software without specific prior written permission.</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment">//</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment">// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment">// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span></div>
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<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment">// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span></div>
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<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span></div>
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<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment">// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="comment">// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment">// POSSIBILITY OF SUCH DAMAGE.</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment">//</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span> </div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="preprocessor">#include &lt;<a class="code" href="../../d2/df9/jcc__rewrite__pass_8hpp.html">obf/passes/jcc_rewrite_pass.hpp</a>&gt;</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="preprocessor">#include &lt;<a class="code" href="../../d5/d54/next__inst__pass_8hpp.html">obf/passes/next_inst_pass.hpp</a>&gt;</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span> </div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="keyword">namespace </span><a class="code hl_namespace" href="../../d5/da8/namespacetheo_1_1obf.html" title="this is the main namespace for obfuscation related things.">theo::obf</a> {</div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html#afc17278f751fe3f5868c988faffb3c92"> 35</a></span><a class="code hl_class" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html" title="jcc rewrite pass which rewrites rip relative jcc&#39;s so that they are position independent.">jcc_rewrite_pass_t</a>* <a class="code hl_function" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html#afc17278f751fe3f5868c988faffb3c92">jcc_rewrite_pass_t::get</a>() {</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">static</span> <a class="code hl_class" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html" title="jcc rewrite pass which rewrites rip relative jcc&#39;s so that they are position independent.">jcc_rewrite_pass_t</a> obj;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span> <span class="keywordflow">return</span> &amp;obj;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span>}</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span> </div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html#a5a93eb0945025ef3caefed8c63b65b23"> 40</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="../../d6/dc1/classtheo_1_1obf_1_1jcc__rewrite__pass__t.html#a5a93eb0945025ef3caefed8c63b65b23" title="virtual method which must be implimented by the pass that inherits this class.">jcc_rewrite_pass_t::run</a>(<a class="code hl_class" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html" title="symbol_t is an abstraction upon the coff symbol. this allows for easier manipulation of the symbol....">decomp::symbol_t</a>* sym) {</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span> std::int32_t disp = {};</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span> xed_decoded_inst_t inst;</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span> xed_state_t istate{XED_MACHINE_MODE_LONG_64, XED_ADDRESS_WIDTH_64b};</div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span> xed_decoded_inst_zero_set_mode(&amp;inst, &amp;istate);</div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span> xed_decode(&amp;inst, sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b" title="returns a vector by reference of bytes containing the data of the symbol.">data</a>().data(), XED_MAX_INSTRUCTION_BYTES);</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span> </div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// if the instruction is branching...</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span> <span class="keywordflow">if</span> ((disp = xed_decoded_inst_get_branch_displacement(&amp;inst))) {</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span> disp += xed_decoded_inst_get_length(&amp;inst);</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span> <span class="comment">// update displacement...</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span> xed_decoded_inst_set_branch_displacement(</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span> &amp;inst, sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b" title="returns a vector by reference of bytes containing the data of the symbol.">data</a>().size() - xed_decoded_inst_get_length(&amp;inst),</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span> xed_decoded_inst_get_branch_displacement_width(&amp;inst));</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span> xed_encoder_request_init_from_decode(&amp;inst);</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span> xed_encoder_request_t* req = &amp;inst;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span> </div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span> <span class="comment">// update jcc in the buffer...</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span> std::uint32_t len = {};</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span> xed_encode(req, sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#aa3ecf0b480d10bffe68812409c06d61b" title="returns a vector by reference of bytes containing the data of the symbol.">data</a>().data(), xed_decoded_inst_get_length(&amp;inst),</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span> &amp;len);</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span> </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span> <span class="comment">// create a relocation to the instruction the branch would normally go</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span> <span class="comment">// too...</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span> <span class="keyword">auto</span> offset = disp &lt; 0 ? sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#a79759d343ddb6a62e4149aef92e2d70b" title="gets the offset into the section where the symbol is located.">offset</a>() - std::abs(disp)</div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span> : sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#a79759d343ddb6a62e4149aef92e2d70b" title="gets the offset into the section where the symbol is located.">offset</a>() + std::abs(disp);</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span> </div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span> <span class="keyword">auto</span> sym_name =</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span> std::string(</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span> sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#a0e6f850f25a51609fbe5dc0a61b27bc9" title="returns a pointer to the coff symbol object.">sym</a>()-&gt;name.to_string(sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#ad97ad0395e18dcfb42017fb7753e0665" title="gets the imagine in which the symbol is located inside of.">img</a>()-&gt;get_strings()).data())</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span> .append(<span class="stringliteral">&quot;@&quot;</span>)</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span> .append(std::to_string(offset));</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span> </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span> sym-&gt;<a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#abc158e1dc1567161f0a57ed15fc718f7" title="returns a vector of relocations.">relocs</a>().push_back(</div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span> <a class="code hl_class" href="../../dd/d37/classtheo_1_1recomp_1_1reloc__t.html" title="meta data about a relocation for a symbol">recomp::reloc_t</a>(0, <a class="code hl_function" href="../../d9/dd5/classtheo_1_1decomp_1_1symbol__t.html#a8695d75670cc4d61d275464e9109ff06" title="gets the hash of the symbol name.">decomp::symbol_t::hash</a>(sym_name), sym_name.data()));</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span> </div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span> <span class="comment">// run next_inst_pass on this symbol to generate the transformations for the</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span> <span class="comment">// relocation to the jcc branch dest instruction...</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span> <a class="code hl_function" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#a964e6f5291ccba0442519f2563b3a2e9">next_inst_pass_t::get</a>()-&gt;<a class="code hl_function" href="../../d5/d08/classtheo_1_1obf_1_1next__inst__pass__t.html#ae4cbba78b14c2b9da794386e4d92f40f" title="virtual method which must be implimented by the pass that inherits this class.">run</a>(sym);</div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span> }</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span>};</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span>} <span class="comment">// namespace theo::obf</span></div>
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