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/***************************************************************************************************
Zyan Disassembler Library (Zydis)
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.
***************************************************************************************************/
/**
* @file
* @brief Other utility functions.
*/
#ifndef ZYDIS_UTILS_H
#define ZYDIS_UTILS_H
#include "zydis/Zycore/Defines.h"
#include "zydis/Zydis/DecoderTypes.h"
#include "zydis/Zydis/Status.h"
#ifdef __cplusplus
extern "C" {
#endif
/* ============================================================================================== */
/* Macros */
/* ============================================================================================== */
/* ---------------------------------------------------------------------------------------------- */
/* Constants */
/* ---------------------------------------------------------------------------------------------- */
#define ZYDIS_MAX_INSTRUCTION_SEGMENT_COUNT 9
/* ---------------------------------------------------------------------------------------------- */
/* ============================================================================================== */
/* Enums and types */
/* ============================================================================================== */
/**
* @brief Defines the `ZydisInstructionSegment` struct.
*/
typedef enum ZydisInstructionSegment_
{
ZYDIS_INSTR_SEGMENT_NONE,
/**
* @brief The legacy prefixes (including ignored `REX` prefixes).
*/
ZYDIS_INSTR_SEGMENT_PREFIXES,
/**
* @brief The effective `REX` prefix byte.
*/
ZYDIS_INSTR_SEGMENT_REX,
/**
* @brief The `XOP` prefix bytes.
*/
ZYDIS_INSTR_SEGMENT_XOP,
/**
* @brief The `VEX` prefix bytes.
*/
ZYDIS_INSTR_SEGMENT_VEX,
/**
* @brief The `EVEX` prefix bytes.
*/
ZYDIS_INSTR_SEGMENT_EVEX,
/**
* @brief The `MVEX` prefix bytes.
*/
ZYDIS_INSTR_SEGMENT_MVEX,
/**
* @brief The opcode bytes.
*/
ZYDIS_INSTR_SEGMENT_OPCODE,
/**
* @brief The `ModRM` byte.
*/
ZYDIS_INSTR_SEGMENT_MODRM,
/**
* @brief The `SIB` byte.
*/
ZYDIS_INSTR_SEGMENT_SIB,
/**
* @brief The displacement bytes.
*/
ZYDIS_INSTR_SEGMENT_DISPLACEMENT,
/**
* @brief The immediate bytes.
*/
ZYDIS_INSTR_SEGMENT_IMMEDIATE,
/**
* @brief Maximum value of this enum.
*/
ZYDIS_INSTR_SEGMENT_MAX_VALUE = ZYDIS_INSTR_SEGMENT_IMMEDIATE,
/**
* @brief The minimum number of bits required to represent all values of this enum.
*/
ZYDIS_INSTR_SEGMENT_REQUIRED_BITS = ZYAN_BITS_TO_REPRESENT(ZYDIS_INSTR_SEGMENT_MAX_VALUE)
} ZydisInstructionSegment;
/**
* @brief Defines the `ZydisInstructionSegments` struct.
*/
typedef struct ZydisInstructionSegments_
{
/**
* @brief The number of logical instruction segments.
*/
ZyanU8 count;
struct
{
/**
* @brief The type of the segment.
*/
ZydisInstructionSegment type;
/**
* @brief The offset of the segment relative to the start of the instruction (in bytes).
*/
ZyanU8 offset;
/**
* @brief The size of the segment, in bytes.
*/
ZyanU8 size;
} segments[ZYDIS_MAX_INSTRUCTION_SEGMENT_COUNT];
} ZydisInstructionSegments;
/* ============================================================================================== */
/* Exported functions */
/* ============================================================================================== */
/**
* @addtogroup utils Utils
* @brief Miscellaneous utility functions. Address translation and other helpers.
* @{
*/
/* ---------------------------------------------------------------------------------------------- */
/* Address calculation */
/* ---------------------------------------------------------------------------------------------- */
// TODO: Provide a function that works in minimal-mode and does not require a operand parameter
/**
* @brief Calculates the absolute address value for the given instruction operand.
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param operand A pointer to the `ZydisDecodedOperand` struct.
* @param runtime_address The runtime address of the instruction.
* @param result_address A pointer to the memory that receives the absolute address.
*
* @return A zyan status code.
*
* You should use this function in the following cases:
* - `IMM` operands with relative address (e.g. `JMP`, `CALL`, ...)
* - `MEM` operands with `RIP`/`EIP`-relative address (e.g. `MOV RAX, [RIP+0x12345678]`)
* - `MEM` operands with absolute address (e.g. `MOV RAX, [0x12345678]`)
* - The displacement needs to get truncated and zero extended
*/
ZYDIS_EXPORT ZyanStatus ZydisCalcAbsoluteAddress(const ZydisDecodedInstruction* instruction,
const ZydisDecodedOperand* operand, ZyanU64 runtime_address, ZyanU64* result_address);
/**
* @brief Calculates the absolute address value for the given instruction operand.
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param operand A pointer to the `ZydisDecodedOperand` struct.
* @param runtime_address The runtime address of the instruction.
* @param register_context A pointer to the `ZydisRegisterContext` struct.
* @param result_address A pointer to the memory that receives the absolute target-address.
*
* @return A zyan status code.
*
* This function behaves like `ZydisCalcAbsoluteAddress` but takes an additional register-context
* argument to allow calculation of addresses depending on runtime register values.
*
* Note that `IP/EIP/RIP` from the register-context will be ignored in favor of the passed
* runtime-address.
*/
ZYDIS_EXPORT ZyanStatus ZydisCalcAbsoluteAddressEx(const ZydisDecodedInstruction* instruction,
const ZydisDecodedOperand* operand, ZyanU64 runtime_address,
const ZydisRegisterContext* register_context, ZyanU64* result_address);
/* ---------------------------------------------------------------------------------------------- */
/* Accessed CPU flags */
/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Returns a mask of accessed CPU-flags matching the given `action`.
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param action The CPU-flag action.
* @param flags Receives the flag mask.
*
* @return A zyan status code.
*/
ZYDIS_EXPORT ZyanStatus ZydisGetAccessedFlagsByAction(const ZydisDecodedInstruction* instruction,
ZydisCPUFlagAction action, ZydisCPUFlags* flags);
/**
* @brief Returns a mask of accessed CPU-flags that are read (tested) by the current instruction.
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param flags Receives the flag mask.
*
* @return A zyan status code.
*/
ZYDIS_EXPORT ZyanStatus ZydisGetAccessedFlagsRead(const ZydisDecodedInstruction* instruction,
ZydisCPUFlags* flags);
/**
* @brief Returns a mask of accessed CPU-flags that are written (modified, undefined) by the
* current instruction.
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param flags Receives the flag mask.
*
* @return A zyan status code.
*/
ZYDIS_EXPORT ZyanStatus ZydisGetAccessedFlagsWritten(const ZydisDecodedInstruction* instruction,
ZydisCPUFlags* flags);
/* ---------------------------------------------------------------------------------------------- */
/* Instruction segments */
/* ---------------------------------------------------------------------------------------------- */
/**
* @brief Returns offsets and sizes of all logical instruction segments (e.g. `OPCODE`,
* `MODRM`, ...).
*
* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
* @param segments Receives the instruction segments information.
*
* @return A zyan status code.
*/
ZYDIS_EXPORT ZyanStatus ZydisGetInstructionSegments(const ZydisDecodedInstruction* instruction,
ZydisInstructionSegments* segments);
/* ---------------------------------------------------------------------------------------------- */
/**
* @}
*/
/* ============================================================================================== */
#ifdef __cplusplus
}
#endif
#endif /* ZYDIS_UTILS_H */
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