zydis/include/Zydis/Decoder.h

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/***************************************************************************************************
Zyan Disassembler Library (Zydis)
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Original Author : Florian Bernd
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
***************************************************************************************************/
#ifndef ZYDIS_DECODER_H
#define ZYDIS_DECODER_H
#include <Zydis/Defines.h>
#include <Zydis/Types.h>
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#include <Zydis/Status.h>
#include <Zydis/Input.h>
#include <Zydis/InstructionInfo.h>
#ifdef __cplusplus
extern "C" {
#endif
/* ============================================================================================== */
/* Enums and types */
/* ============================================================================================== */
/**
* @brief Defines the @c ZydisDecoderFlags datatype.
*/
typedef uint32_t ZydisDecoderFlags;
/**
* @brief Set this flag if you do not want @c ZydisDecoderDecodeNextInstruction to fail with
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* @c ZYDIS_STATUS_DECODING_ERROR, if an invalid instruction was found.
*
* If this flag is set, @c ZydisDecoderDecodeNextInstruction just skips one byte and
* returns @c ZYDIS_STATUS_SUCCESS. The returned @c ZydisInstructionInfo struct will
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* have one of the @c ZYDIS_INSTRFLAG_ERROR_MASK flags set.
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*/
#define ZYDIS_DECODER_FLAG_SKIP_DATA 0x00000001
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/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Defines the @c ZydisInstructionDecoder struct.
*/
typedef struct ZydisInstructionDecoder_
{
/**
* @brief The current disassembler-mode.
*/
ZydisDisassemblerMode disassemblerMode;
/**
* @brief A pointer to the current input data-source.
*/
ZydisCustomInput* input;
/**
* @brief Decoder flags.
*/
ZydisDecoderFlags flags;
/**
* @brief The current instruction-pointer value.
*/
uint64_t instructionPointer;
/**
* @brief Internal field. @c TRUE, if the @c imm8 value is already initialized.
*/
ZydisBool imm8initialized;
/**
* @brief Internal field. We have to store a copy of the imm8 value for instructions that
* encode different operands in the lo and hi part of the immediate.
*/
uint8_t imm8;
/**
* @brief Internal field. The 0x66 prefix can be consumed, if it is used as mandatory-prefix.
* This field contains the prefix-byte, if the prefix is present and not already
* consumed.
*/
uint8_t hasUnusedPrefix66;
/**
* @brief Internal field. The mutally exclusive 0xF2 and 0xF3 prefixs can be consumed, if
* they are used as mandatory-prefix. This field contains the prefix-byte of the
* latest 0xF2 or 0xF3 prefix, if one of the prefixes is present and not already
* consumed.
*/
uint8_t hasUnusedPrefixF2F3;
/**
* @brief Internal field. Contains the latest (significant) segment prefix.
*/
uint8_t lastSegmentPrefix;
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/**
* @brief Internal buffer.
*/
struct
{
uint8_t data[30];
uint8_t count;
uint8_t posRead;
uint8_t posWrite;
} buffer;
} ZydisInstructionDecoder;
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
/* Exported functions */
/* ============================================================================================== */
/**
* @brief Initializes the given @c ZydisInstructionDecoder instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param disassemblerMode The desired disassembler-mode.
* @param input A pointer to the input data-source.
*
* @return A zydis status code.
*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderInitInstructionDecoder(ZydisInstructionDecoder* decoder,
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ZydisDisassemblerMode disassemblerMode, ZydisCustomInput* input);
/**
* @brief Initializes the given @c ZydisInstructionDecoder instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param disassemblerMode The desired disassembler-mode.
* @param input A pointer to the input data-source.
* @param flags Additional flags for the instruction-decoder.
*
* @return A zydis status code.
*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderInitInstructionDecoderEx(ZydisInstructionDecoder* decoder,
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ZydisDisassemblerMode disassemblerMode, ZydisCustomInput* input, ZydisDecoderFlags flags);
/**
* @brief Returns the current input data-source of the given @c ZydisInstructionDecoder
* instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param input A pointer to the memory that receives the current input data-source pointer.
*
* @return A zydis status code.
*/
ZYDIS_EXPORT ZydisStatus ZydisDecoderGetInput(const ZydisInstructionDecoder* decoder,
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ZydisCustomInput** input);
/**
* @brief Changes the input data-source of the given @c ZydisInstructionDecoder instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param input A pointer to the new input data-source.
*
* @return A zydis status code.
*
* This function flushes the internal input-buffer.
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*/
ZYDIS_EXPORT ZydisStatus ZydisDecoderSetInput(ZydisInstructionDecoder* decoder,
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ZydisCustomInput* input);
/**
* @brief Returns the current instruction-pointer of the given @c ZydisInstructionDecoder
* instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param instructionPointer A pointer to the memory that receives the current
* instruction-pointer.
*
* @return A zydis status code.
*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderGetInstructionPointer(
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const ZydisInstructionDecoder* decoder, uint64_t* instructionPointer);
/**
* @brief Changes the instruction-pointer of the given @c ZydisInstructionDecoder instance.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param instructionPointer The new instruction-pointer value.
*
* @return A zydis status code.
*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderSetInstructionPointer(ZydisInstructionDecoder* decoder,
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uint64_t instructionPointer);
/**
* @brief Decodes the next instruction from the decoders input data-source.
*
* @param decoder A pointer to the @c ZydisInstructionDecoder instance.
* @param info A pointer to the @c ZydisInstructionInfo struct, that receives the details
* about the decoded instruction.
*
* @return A zydis status code.
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*/
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ZYDIS_EXPORT ZydisStatus ZydisDecoderDecodeNextInstruction(ZydisInstructionDecoder* decoder,
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ZydisInstructionInfo* info);
/* ============================================================================================== */
#ifdef __cplusplus
}
#endif
#endif /* ZYDIS_DECODER_H */