304 lines
12 KiB
C
304 lines
12 KiB
C
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/***************************************************************************************************
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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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* 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 <Zycore/Types.h>
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#include <Zycore/Defines.h>
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#include <Zydis/DecoderTypes.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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* Defines the `ZydisDecoderMode` enum.
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*/
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typedef enum ZydisDecoderMode_
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{
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/**
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* 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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* 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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* 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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* 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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* 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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* 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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* 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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* 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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* Enables the `CLDEMOTE` mode.
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*
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* The `CLDEMOTE` 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_CLDEMOTE,
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/**
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* Maximum value of this enum.
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*/
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ZYDIS_DECODER_MODE_MAX_VALUE = ZYDIS_DECODER_MODE_CLDEMOTE,
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/**
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* The minimum number of bits required to represent all values of this enum.
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*/
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ZYDIS_DECODER_MODE_REQUIRED_BITS = ZYAN_BITS_TO_REPRESENT(ZYDIS_DECODER_MODE_MAX_VALUE)
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} ZydisDecoderMode;
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/* ---------------------------------------------------------------------------------------------- */
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/* Decoder struct */
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/* ---------------------------------------------------------------------------------------------- */
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/**
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* Defines the `ZydisDecoder` struct.
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*
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* All fields in this struct should be considered as "private". Any changes may lead to unexpected
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* behavior.
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*/
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typedef struct ZydisDecoder_
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{
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/**
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* The machine mode.
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*/
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ZydisMachineMode machine_mode;
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/**
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* The stack width.
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*/
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ZydisStackWidth stack_width;
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/**
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* The decoder mode array.
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*/
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ZyanBool decoder_mode[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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* @addtogroup decoder Decoder
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* Functions allowing decoding of instruction bytes to a machine interpretable struct.
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* @{
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*/
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/**
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* Initializes the given `ZydisDecoder` instance.
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*
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* @param decoder A pointer to the `ZydisDecoder` instance.
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* @param machine_mode The machine mode.
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* @param stack_width The stack width.
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*
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* @return A zyan status code.
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*/
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ZYDIS_EXPORT ZyanStatus ZydisDecoderInit(ZydisDecoder* decoder, ZydisMachineMode machine_mode,
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ZydisStackWidth stack_width);
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/**
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* Enables or disables the specified decoder-mode.
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*
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* @param decoder A pointer to the `ZydisDecoder` instance.
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* @param mode The decoder mode.
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* @param enabled `ZYAN_TRUE` to enable, or `ZYAN_FALSE` to disable the specified decoder-mode.
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*
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* @return A zyan status code.
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*/
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ZYDIS_EXPORT ZyanStatus ZydisDecoderEnableMode(ZydisDecoder* decoder, ZydisDecoderMode mode,
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ZyanBool enabled);
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/**
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* Decodes the instruction in the given input `buffer` and returns all details (e.g. operands).
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*
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* @param decoder A pointer to the `ZydisDecoder` instance.
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* @param buffer A pointer to the input buffer.
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* @param length The length of the input buffer. Note that this can be bigger than the
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* actual size of the instruction -- you don't have to know the size up
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* front. This length is merely used to prevent Zydis from doing
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* out-of-bounds reads on your buffer.
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* @param instruction A pointer to the `ZydisDecodedInstruction` struct receiving the details
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* about the decoded instruction.
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* @param operands A pointer to an array with `ZYDIS_MAX_OPERAND_COUNT` entries that
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* receives the decoded operands. The number of operands decoded is
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* determined by the `instruction.operand_count` field. Excess entries are
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* zeroed.
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*
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* This is a convenience function that combines the following functions into one call:
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*
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* - `ZydisDecoderDecodeInstruction`
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* - `ZydisDecoderDecodeOperands`
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*
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* Please refer to `ZydisDecoderDecodeInstruction` if operand decoding is not required or should
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* be done separately (`ZydisDecoderDecodeOperands`).
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*
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* This function is not available in MINIMAL_MODE.
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*
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* @return A zyan status code.
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*/
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ZYDIS_EXPORT ZyanStatus ZydisDecoderDecodeFull(const ZydisDecoder* decoder,
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const void* buffer, ZyanUSize length, ZydisDecodedInstruction* instruction,
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ZydisDecodedOperand operands[ZYDIS_MAX_OPERAND_COUNT]);
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/**
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* Decodes the instruction in the given input `buffer`.
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*
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* @param decoder A pointer to the `ZydisDecoder` instance.
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* @param context A pointer to a decoder context struct which is required for further
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* decoding (e.g. operand decoding using `ZydisDecoderDecodeOperands`) or
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* `ZYAN_NULL` if not needed.
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* @param buffer A pointer to the input buffer.
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* @param length The length of the input buffer. Note that this can be bigger than the
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* actual size of the instruction -- you don't have to know the size up
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* front. This length is merely used to prevent Zydis from doing
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* out-of-bounds reads on your buffer.
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* @param instruction A pointer to the `ZydisDecodedInstruction` struct, that receives the
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* details about the decoded instruction.
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*
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* @return A zyan status code.
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*/
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ZYDIS_EXPORT ZyanStatus ZydisDecoderDecodeInstruction(const ZydisDecoder* decoder,
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ZydisDecoderContext* context, const void* buffer, ZyanUSize length,
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ZydisDecodedInstruction* instruction);
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/**
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* Decodes the instruction operands.
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*
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* @param decoder A pointer to the `ZydisDecoder` instance.
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* @param context A pointer to the `ZydisDecoderContext` struct.
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* @param instruction A pointer to the `ZydisDecodedInstruction` struct.
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* @param operands The array that receives the decoded operands.
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* Refer to `ZYDIS_MAX_OPERAND_COUNT` or `ZYDIS_MAX_OPERAND_COUNT_VISIBLE`
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* when allocating space for the array to ensure that the buffer size is
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* sufficient to always fit all instruction operands.
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* Refer to `instruction.operand_count` or
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* `instruction.operand_count_visible' when allocating space for the array
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* to ensure that the buffer size is sufficient to fit all operands of
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* the given instruction.
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* @param operand_count The length of the `operands` array.
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* This argument as well limits the maximum amount of operands to decode.
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* If this value is `0`, no operands will be decoded and `ZYAN_NULL` will
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* be accepted for the `operands` argument.
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*
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* This function fails, if `operand_count` is larger than the total number of operands for the
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* given instruction (`instruction.operand_count`).
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*
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* This function is not available in MINIMAL_MODE.
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*
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* @return A zyan status code.
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*/
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ZYDIS_EXPORT ZyanStatus ZydisDecoderDecodeOperands(const ZydisDecoder* decoder,
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const ZydisDecoderContext* context, const ZydisDecodedInstruction* instruction,
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ZydisDecodedOperand* operands, ZyanU8 operand_count);
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/** @} */
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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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