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68 lines
2.6 KiB
68 lines
2.6 KiB
// Copyright (c) 2022, _xeroxz
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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#pragma once
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#include <obf/pass.hpp>
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namespace theo::obf {
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/// <summary>
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/// jcc rewrite pass which rewrites rip relative jcc's so that they are position
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/// independent.
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///
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/// given the following code:
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///
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/// jnz label1
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/// ; other code goes here
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/// label1:
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/// ; more code here
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///
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/// the jnz instruction will be rewritten so that the following code is
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/// generated:
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///
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/// jnz br2
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/// br1:
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/// jmp [rip] ; address after this instruction contains the address
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/// ; of the instruction after the jcc.
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/// br2:
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/// jmp [rip] ; address after this instruction contains the address of where
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/// ; branch 2 is located.
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///
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/// its important to note that other passes will encrypt (transform) the address
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/// of the next instruction. There is actually no jmp [rip] either, push/ret is
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/// used.
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/// </summary>
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class jcc_rewrite_pass_t : public pass_t {
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explicit jcc_rewrite_pass_t() : pass_t(decomp::sym_type_t::instruction){};
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public:
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static jcc_rewrite_pass_t* get();
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void run(decomp::symbol_t* sym);
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};
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} // namespace theo::obf
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