| 1 | /** @file
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| 2 | Instruction parsing support definitions.
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| 3 |
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| 4 | Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
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| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 6 |
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| 7 | **/
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| 8 |
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| 9 | #ifndef __INSTRUCTION_PARSING_H__
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| 10 | #define __INSTRUCTION_PARSING_H__
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| 11 |
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| 12 | #include <Base.h>
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| 13 | #include <Uefi.h>
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| 14 |
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| 15 | //
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| 16 | // Instruction REX prefix definition
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| 17 | //
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| 18 | typedef union {
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| 19 | struct {
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| 20 | UINT8 BitB:1;
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| 21 | UINT8 BitX:1;
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| 22 | UINT8 BitR:1;
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| 23 | UINT8 BitW:1;
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| 24 | UINT8 Rex:4;
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| 25 | } Bits;
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| 26 |
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| 27 | UINT8 Uint8;
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| 28 | } INSTRUCTION_REX_PREFIX;
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| 29 |
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| 30 | //
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| 31 | // Instruction ModRM definition
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| 32 | //
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| 33 | typedef union {
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| 34 | struct {
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| 35 | UINT8 Rm:3;
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| 36 | UINT8 Reg:3;
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| 37 | UINT8 Mod:2;
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| 38 | } Bits;
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| 39 |
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| 40 | UINT8 Uint8;
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| 41 | } INSTRUCTION_MODRM;
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| 42 |
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| 43 | //
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| 44 | // Instruction SIB definition
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| 45 | //
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| 46 | typedef union {
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| 47 | struct {
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| 48 | UINT8 Base:3;
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| 49 | UINT8 Index:3;
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| 50 | UINT8 Scale:2;
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| 51 | } Bits;
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| 52 |
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| 53 | UINT8 Uint8;
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| 54 | } INSTRUCTION_SIB;
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| 55 |
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| 56 | //
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| 57 | // Legacy Instruction Prefixes
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| 58 | //
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| 59 | #define OVERRIDE_SEGMENT_CS 0x2E
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| 60 | #define OVERRIDE_SEGMENT_DS 0x3E
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| 61 | #define OVERRIDE_SEGMENT_ES 0x26
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| 62 | #define OVERRIDE_SEGMENT_SS 0x36
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| 63 | #define OVERRIDE_SEGMENT_FS 0x64
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| 64 | #define OVERRIDE_SEGMENT_GS 0x65
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| 65 | #define OVERRIDE_OPERAND_SIZE 0x66
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| 66 | #define OVERRIDE_ADDRESS_SIZE 0x67
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| 67 | #define LOCK_PREFIX 0xF0
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| 68 | #define REPNZ_PREFIX 0xF2
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| 69 | #define REPZ_PREFIX 0xF3
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| 70 |
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| 71 | //
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| 72 | // REX Prefixes
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| 73 | //
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| 74 | #define REX_PREFIX_START 0x40
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| 75 | #define REX_PREFIX_STOP 0x4F
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| 76 | #define REX_64BIT_OPERAND_SIZE_MASK 0x08
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| 77 |
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| 78 | //
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| 79 | // Two-byte Opcode Flag
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| 80 | //
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| 81 | #define TWO_BYTE_OPCODE_ESCAPE 0x0F
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| 82 |
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| 83 | #endif
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