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Add initial limited opcode data

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omicron 2025-04-13 20:35:25 +02:00
parent d59559d327
commit 2cf69f5e18
2 changed files with 201 additions and 0 deletions
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145
src/data/opcodes.c Normal file
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#include "opcodes.h"
// clang-format off
opcode_data_t *const opcodes[] = {
// RET
&(opcode_data_t) {
.mnemonic = "ret",
.opcode = 0xC3,
.opcode_extension = opcode_extension_none,
.operand_count = 0,
},
// RET imm16
&(opcode_data_t) {
.mnemonic = "ret",
.opcode = 0xC2,
.opcode_extension = opcode_extension_none,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_16 },
},
},
// PUSH imm8
&(opcode_data_t) {
.mnemonic = "push",
.opcode = 0x6A,
.opcode_extension = opcode_extension_none,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_8},
},
},
// PUSH imm16
&(opcode_data_t) {
.mnemonic = "push",
.opcode = 0x68,
.opcode_extension = opcode_extension_none,
.operand_size_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_16},
},
},
// PUSH imm32
&(opcode_data_t) {
.mnemonic = "push",
.opcode = 0x68,
.opcode_extension = opcode_extension_none,
.operand_size_prefix = false,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_IMMEDIATE, .size = OPERAND_SIZE_32},
},
},
// PUSH reg16,
&(opcode_data_t) {
.mnemonic = "push",
.opcode = 0x50,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_OPCODE_REGISTER,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_16 },
},
},
// PUSH reg64
&(opcode_data_t) {
.mnemonic = "push",
.opcode = 0x50,
.opcode_extension = opcode_extension_none,
.encoding_class = ENCODING_OPCODE_REGISTER,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
// NOT reg16
&(opcode_data_t) {
.mnemonic = "not",
.opcode = 0xF7,
.opcode_extension = 2,
.operand_size_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_16 },
},
},
// NOT reg32
&(opcode_data_t) {
.mnemonic = "not",
.opcode = 0xF7,
.opcode_extension = 2,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_32 },
},
},
// NOT reg64
&(opcode_data_t) {
.mnemonic = "not",
.opcode = 0xF7,
.opcode_extension = 2,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
// NEG reg16
&(opcode_data_t) {
.mnemonic = "neg",
.opcode = 0xF7,
.opcode_extension = 3,
.operand_size_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_16 },
},
},
// NEG reg32
&(opcode_data_t) {
.mnemonic = "neg",
.opcode = 0xF7,
.opcode_extension = 3,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_32 },
},
},
// NEG reg64
&(opcode_data_t) {
.mnemonic = "neg",
.opcode = 0xF7,
.opcode_extension = 3,
.rex_w_prefix = true,
.operand_count = 1,
.operands = {
{ .kind = OPERAND_REGISTER, .size = OPERAND_SIZE_64 },
},
},
nullptr,
};

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src/data/opcodes.h Normal file
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#ifndef INCLUDE_DATA_OPCODES_H_
#define INCLUDE_DATA_OPCODES_H_
#include "../data/registers.h"
#include <stddef.h>
#include <stdint.h>
constexpr uint8_t rex_prefix = 0x40;
constexpr uint8_t rex_prefix_w = 0x48;
constexpr uint8_t rex_prefix_r = 0x44;
constexpr uint8_t rex_prefix_x = 0x42;
constexpr uint8_t rex_prefix_b = 0x41;
constexpr uint8_t operand_size_prefix = 0x66;
constexpr uint8_t memory_size_prefix = 0x67;
constexpr uint8_t lock_prefix = 0xF0;
constexpr uint8_t repne_prefix = 0xF2;
constexpr uint8_t rep_prefix = 0xF3;
typedef enum encoding_class {
ENCODING_DEFAULT, // use modrm+sib for registers and memory, append
// immediates
ENCODING_OPCODE_REGISTER, // encode the register in the last 3 bits of the
// opcode
} encoding_class_t;
typedef enum operand_kind {
OPERAND_REGISTER,
OPERAND_MEMORY,
OPERAND_IMMEDIATE,
} operand_kind_t;
typedef struct operand_info {
operand_kind_t kind;
operand_size_t size;
} operand_info_t;
constexpr uint8_t opcode_extension_none = 0xFF;
typedef struct opcode_data {
const char *mnemonic;
uint16_t opcode;
uint8_t opcode_extension; // 3 bits for the opcode extension in the reg
// field of a modr/m byte
encoding_class_t encoding_class;
bool operand_size_prefix;
bool address_size_prefix;
bool rex_w_prefix;
size_t operand_count;
operand_info_t operands[3];
} opcode_data_t;
extern opcode_data_t *const opcodes[];
#endif // INCLUDE_DATA_OPCODES_H_