tor-browser

The Tor Browser
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Utils.h (4724B)

      1 /***************************************************************************************************
      2 
      3  Zyan Disassembler Library (Zydis)
      4 
      5  Original Author : Florian Bernd
      6 
      7 * Permission is hereby granted, free of charge, to any person obtaining a copy
      8 * of this software and associated documentation files (the "Software"), to deal
      9 * in the Software without restriction, including without limitation the rights
     10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11 * copies of the Software, and to permit persons to whom the Software is
     12 * furnished to do so, subject to the following conditions:
     13 *
     14 * The above copyright notice and this permission notice shall be included in all
     15 * copies or substantial portions of the Software.
     16 *
     17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
     23 * SOFTWARE.
     24 
     25 ***************************************************************************************************/
     26 
     27 /**
     28 * @file
     29 * Other utility functions.
     30 */
     31 
     32 #ifndef ZYDIS_UTILS_H
     33 #define ZYDIS_UTILS_H
     34 
     35 #include "zydis/Zycore/Defines.h"
     36 #include "zydis/Zydis/DecoderTypes.h"
     37 #include "zydis/Zydis/Status.h"
     38 
     39 #ifdef __cplusplus
     40 extern "C" {
     41 #endif
     42 
     43 /* ============================================================================================== */
     44 /* Exported functions                                                                             */
     45 /* ============================================================================================== */
     46 
     47 /**
     48 * @addtogroup utils Utils
     49 * Miscellaneous utility functions. Address translation and other helpers.
     50 * @{
     51 */
     52 
     53 /* ---------------------------------------------------------------------------------------------- */
     54 /* Address calculation                                                                            */
     55 /* ---------------------------------------------------------------------------------------------- */
     56 
     57 // TODO: Provide a function that works in minimal-mode and does not require a operand parameter
     58 
     59 /**
     60 * Calculates the absolute address value for the given instruction operand.
     61 *
     62 * @param   instruction     A pointer to the `ZydisDecodedInstruction` struct.
     63 * @param   operand         A pointer to the `ZydisDecodedOperand` struct.
     64 * @param   runtime_address The runtime address of the instruction.
     65 * @param   result_address  A pointer to the memory that receives the absolute address.
     66 *
     67 * @return  A zyan status code.
     68 *
     69 * You should use this function in the following cases:
     70 * - `IMM` operands with relative address (e.g. `JMP`, `CALL`, ...)
     71 * - `MEM` operands with `RIP`/`EIP`-relative address (e.g. `MOV RAX, [RIP+0x12345678]`)
     72 * - `MEM` operands with absolute address (e.g. `MOV RAX, [0x12345678]`)
     73 *   - The displacement needs to get truncated and zero extended
     74 */
     75 ZYDIS_EXPORT ZyanStatus ZydisCalcAbsoluteAddress(const ZydisDecodedInstruction* instruction,
     76    const ZydisDecodedOperand* operand, ZyanU64 runtime_address, ZyanU64* result_address);
     77 
     78 /**
     79 * Calculates the absolute address value for the given instruction operand.
     80 *
     81 * @param   instruction         A pointer to the `ZydisDecodedInstruction` struct.
     82 * @param   operand             A pointer to the `ZydisDecodedOperand` struct.
     83 * @param   runtime_address     The runtime address of the instruction.
     84 * @param   register_context    A pointer to the `ZydisRegisterContext` struct.
     85 * @param   result_address      A pointer to the memory that receives the absolute target-address.
     86 *
     87 * @return  A zyan status code.
     88 *
     89 * This function behaves like `ZydisCalcAbsoluteAddress` but takes an additional register-context
     90 * argument to allow calculation of addresses depending on runtime register values.
     91 *
     92 * Note that `IP/EIP/RIP` from the register-context will be ignored in favor of the passed
     93 * runtime-address.
     94 */
     95 ZYDIS_EXPORT ZyanStatus ZydisCalcAbsoluteAddressEx(const ZydisDecodedInstruction* instruction,
     96    const ZydisDecodedOperand* operand, ZyanU64 runtime_address,
     97    const ZydisRegisterContext* register_context, ZyanU64* result_address);
     98 
     99 /* ---------------------------------------------------------------------------------------------- */
    100 
    101 /**
    102 * @}
    103 */
    104 
    105 /* ============================================================================================== */
    106 
    107 #ifdef __cplusplus
    108 }
    109 #endif
    110 
    111 #endif /* ZYDIS_UTILS_H */