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instructions_B0.c
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instructions_B0.c
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#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include "instruction_defs.h"
#include "emulator_functions.h"
#include "modrm.h"
#include "io.h"
/*
* mov r8 imm8: 2 bytes
* Copies 8-bit imm value to register specified in op code.
* 1 byte: op (B0) + reg index (3 bits)
* 1 byte: value (8-bit unsigned)
*/
void mov_r8_imm8(Emulator *emu)
{
uint8_t reg = get_code8(emu, 0) - 0xB0;
set_register8(emu, reg, get_code8(emu, 1));
emu->eip += 2;
}
/*
* mov r32 imm32: 5 bytes
* Copies imm value to register specified in op code (r32: 32 bit register).
* 1 byte: op (B8) + reg index (3bits)
* 4 bytes: value (32 bit unsigned)
*/
void mov_r32_imm32(Emulator *emu)
{
uint8_t reg = get_code8(emu, 0) - 0xB8;
uint32_t value = get_code32(emu, 1);
set_register32(emu, reg, value);
emu->eip += 5;
}
/*
* mov r16 imm16: 3 bytes
* Copies imm value to register specified in op code (r32: 32 bit register).
* 1 byte: op (B8) + reg index (3bits)
* 2 bytes: value (16 bit unsigned)
*/
void mov_r16_imm16(Emulator *emu)
{
uint8_t reg = get_code8(emu, 0) - 0xB8;
uint32_t value = get_code32(emu, 1);
set_register16(emu, reg, value);
emu->eip += 3;
}