mirror of https://github.com/x64dbg/zydis
210 lines
7.6 KiB
C
210 lines
7.6 KiB
C
/***************************************************************************************************
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Zyan Disassembler Library (Zydis)
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Original Author : Florian Bernd
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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***************************************************************************************************/
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/**
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* @file
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* @brief Functions for decoding instructions.
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*/
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#ifndef ZYDIS_DECODER_H
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#define ZYDIS_DECODER_H
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#include <Zydis/CommonTypes.h>
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#include <Zydis/DecoderTypes.h>
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#include <Zydis/Defines.h>
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#include <Zydis/Status.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ============================================================================================== */
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/* Enums and types */
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/* ============================================================================================== */
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/* ---------------------------------------------------------------------------------------------- */
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/* Decoder mode */
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/* ---------------------------------------------------------------------------------------------- */
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/**
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* @brief Defines the @c ZydisDecoderMode datatype.
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*/
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typedef ZydisU8 ZydisDecoderMode;
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/**
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* @brief Values that represent decoder-modes.
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*/
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enum ZydisDecoderModes
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{
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/**
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* @brief Enables minimal instruction decoding without semantic analysis.
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*
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* This mode provides access to the mnemonic, the instruction-length, the effective
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* operand-size, the effective address-width, some attributes (e.g. `ZYDIS_ATTRIB_IS_RELATIVE`)
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* and all of the information in the `raw` field of the `ZydisDecodedInstruction` struct.
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*
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* Operands, most attributes and other specific information (like AVX info) are not
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* accessible in this mode.
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*
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* This mode is NOT enabled by default.
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*/
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ZYDIS_DECODER_MODE_MINIMAL,
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/**
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* @brief Enables the AMD-branch mode.
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*
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* Intel ignores the operand-size override-prefix (`0x66`) for all branches with 32-bit
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* immediates and forces the operand-size of the instruction to 64-bit in 64-bit mode.
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* In AMD-branch mode `0x66` is not ignored and changes the operand-size and the size of the
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* immediate to 16-bit.
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*
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* This mode is NOT enabled by default.
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*/
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ZYDIS_DECODER_MODE_AMD_BRANCHES,
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/**
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* @brief Enables KNC compatibility-mode.
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*
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* KNC and KNL+ chips are sharing opcodes and encodings for some mask-related instructions.
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* Enable this mode to use the old KNC specifications (different mnemonics, operands, ..).
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*
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* This mode is NOT enabled by default.
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*/
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ZYDIS_DECODER_MODE_KNC,
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/**
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* @brief Enables the MPX mode.
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*
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* The MPX isa-extension reuses (overrides) some of the widenop instruction opcodes.
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*
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* This mode is enabled by default.
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*/
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ZYDIS_DECODER_MODE_MPX,
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/**
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* @brief Enables the CET mode.
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*
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* The CET isa-extension reuses (overrides) some of the widenop instruction opcodes.
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*
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* This mode is enabled by default.
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*/
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ZYDIS_DECODER_MODE_CET,
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/**
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* @brief Enables the LZCNT mode.
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*
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* The LZCNT isa-extension reuses (overrides) some of the widenop instruction opcodes.
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*
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* This mode is enabled by default.
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*/
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ZYDIS_DECODER_MODE_LZCNT,
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/**
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* @brief Enables the TZCNT mode.
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*
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* The TZCNT isa-extension reuses (overrides) some of the widenop instruction opcodes.
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*
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* This mode is enabled by default.
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*/
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ZYDIS_DECODER_MODE_TZCNT,
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/**
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* @brief Enables the WBNOINVD mode.
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*
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* The `WBINVD` instruction is interpreted as `WBNOINVD` on ICL chips, if a `F3` prefix is
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* used.
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*
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* This mode is disabled by default.
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*/
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ZYDIS_DECODER_MODE_WBNOINVD,
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/**
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* @brief Maximum value of this enum.
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*/
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ZYDIS_DECODER_MODE_MAX_VALUE = ZYDIS_DECODER_MODE_WBNOINVD
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};
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/* ---------------------------------------------------------------------------------------------- */
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/* Decoder struct */
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/* ---------------------------------------------------------------------------------------------- */
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/**
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* @brief Defines the @c ZydisDecoder struct.
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*/
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typedef struct ZydisDecoder_
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{
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ZydisMachineMode machineMode;
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ZydisAddressWidth addressWidth;
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ZydisBool decoderMode[ZYDIS_DECODER_MODE_MAX_VALUE + 1];
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} ZydisDecoder;
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/* ---------------------------------------------------------------------------------------------- */
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/* ============================================================================================== */
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/* Exported functions */
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/* ============================================================================================== */
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/**
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* @brief Initializes the given @c ZydisDecoder instance.
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*
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* @param decoder A pointer to the @c ZydisDecoder instance.
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* @param machineMode The machine mode.
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* @param addressWidth The address width.
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*
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* @return A zydis status code.
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*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderInit(ZydisDecoder* decoder, ZydisMachineMode machineMode,
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ZydisAddressWidth addressWidth);
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/**
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* @brief Enables or disables the specified decoder-mode.
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*
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* @param decoder A pointer to the @c ZydisDecoder instance.
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* @param mode The decoder mode.
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* @param enabled `ZYDIS_TRUE` to enable, or `ZYDIS_FALSE` to disable the specified decoder-mode.
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*
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* @return A zydis status code.
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*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderEnableMode(ZydisDecoder* decoder, ZydisDecoderMode mode,
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ZydisBool enabled);
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/**
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* @brief Decodes the instruction in the given input @c buffer.
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*
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* @param decoder A pointer to the @c ZydisDecoder instance.
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* @param buffer A pointer to the input buffer.
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* @param bufferLen The length of the input buffer.
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* @param instructionPointer The instruction-pointer.
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* @param instruction A pointer to the @c ZydisDecodedInstruction struct, that receives
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* the details about the decoded instruction.
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*
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* @return A zydis status code.
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*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderDecodeBuffer(const ZydisDecoder* decoder,
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const void* buffer, ZydisUSize bufferLen, ZydisU64 instructionPointer,
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ZydisDecodedInstruction* instruction);
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/* ============================================================================================== */
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#ifdef __cplusplus
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}
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#endif
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#endif /* ZYDIS_DECODER_H */
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