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instructions_00.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"
/*
* add rm8 r8: 2 bytes (add byte [eax], ah;)
* Adds value of ModR/M to REG.
* 1 byte: op (00)
* 1 byte: ModR/M
*/
void add_rm8_r8(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint8_t rm8_val = get_rm8(emu, &modrm);
uint8_t r8_val = get_r8(emu, &modrm);
uint16_t result = (uint16_t)rm8_val + (uint16_t)r8_val;
set_rm8(emu, &modrm, result);
update_eflags_add_8bit(emu, rm8_val, r8_val, result);
}
/*
* add rm32 r32: 2 bytes
* Adds value of REG to ModR/M.
* 1 byte: op (01)
* 1 byte: ModR/M
*/
void add_rm32_r32(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint32_t rm32_val = get_rm32(emu, &modrm);
uint32_t r32_val = get_r32(emu, &modrm);
uint64_t result = (uint64_t)rm32_val + (uint64_t)r32_val;
set_rm32(emu, &modrm, result);
update_eflags_add(emu, rm32_val, r32_val, result);
}
/*
* add r8 rm8: 2 bytes
* Adds value of ModR/M to r8.
* 1 byte: op (02)
* 1/2 byte: ModR/M
*/
void add_r8_rm8(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint8_t rm8_val = get_rm8(emu, &modrm);
uint8_t r8_val = get_r8(emu, &modrm);
uint16_t result = (uint16_t)r8_val + (uint16_t)rm8_val;
set_r8(emu, &modrm, result);
update_eflags_add_8bit(emu, r8_val, rm8_val, result);
}
/*
* add r32 rm32: 2 - 3 bytes
* Adds value of ModR/M to r32.
* 1 byte: op (03)
* 1 - 2 byte: ModR/M
*/
void add_r32_rm32(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint32_t r32_val = get_r32(emu, &modrm);
uint32_t rm32_val = get_rm32(emu, &modrm);
uint64_t result = (uint64_t)r32_val + (uint64_t)rm32_val;
set_r32(emu, &modrm, result);
update_eflags_add(emu, r32_val, rm32_val, result);
}
/*
* add al imm8: 2 bytes
* Adds imm8 to al.
* 1 byte: op (04)
* 1 byte: imm8
*/
void add_al_imm8(Emulator *emu)
{
uint8_t imm8_val = get_sign_code8(emu, 1);
uint8_t al_val = get_register8(emu, AL);
uint16_t result = (uint16_t)al_val + (uint16_t)imm8_val;
set_register8(emu, AL, result);
update_eflags_add_8bit(emu, al_val, imm8_val, result);
emu->eip += 2;
}
/*
* add eax imm32: 5 bytes
* Adds imm32 to eax.
* 1 byte: op (05)
* 4 byte: imm32
*/
void add_eax_imm32(Emulator *emu)
{
uint32_t eax_val = get_register32(emu, EAX);
uint32_t imm32_val = get_sign_code32(emu, 1);
uint64_t result = (uint64_t)eax_val + (uint64_t)imm32_val;
set_register32(emu, EAX, result);
update_eflags_add(emu, eax_val, imm32_val, result);
emu->eip += 5;
}
/*
* push es: 1 byte
* Pushes value of ES to stack.
* 1 byte: op (06)
*/
void push_es(Emulator *emu)
{
push_segment_register(emu, ES);
emu->eip += 1;
}
/*
* pop es: 1 byte
* Pops value from stack to ES.
* 1 byte: op (07)
*/
void pop_es(Emulator *emu)
{
pop_segment_register(emu, ES);
emu->eip += 1;
}
/*
* or rm8 r8: 2/3 bytes (or byte [eax], ah;)
* Logical inclusive OR between value of ModR/M and REG, storing result to destination.
* 1 byte: op (08)
* 1/2 byte: ModR/M
*/
void or_rm8_r8(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint8_t rm8_val = get_rm8(emu, &modrm);
uint8_t r8_val = get_r8(emu, &modrm);
uint8_t result = rm8_val | r8_val;
set_rm8(emu, &modrm, result);
update_eflags_logical_ops_8bit(emu, result);
}
/*
* or rm32 r32: 2/3 bytes
* Logical inclusive OR between value of REG and ModR/M, storing result to destination.
* 1 byte: op (09)
* 1/2 byte: ModR/M
*/
void or_rm32_r32(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint32_t rm32_val = get_rm32(emu, &modrm);
uint32_t r32_val = get_r32(emu, &modrm);
uint32_t result = rm32_val | r32_val;
set_rm32(emu, &modrm, result);
update_eflags_logical_ops(emu, result);
}
/*
* or r8 rm8: 2/3 bytes
* Logical inclusive OR between value of ModR/M and r8, storing result of destination.
* 1 byte: op (0A)
* 1/2 byte: ModR/M
*/
void or_r8_rm8(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint8_t rm8_val = get_rm8(emu, &modrm);
uint8_t r8_val = get_r8(emu, &modrm);
uint8_t result = r8_val | rm8_val;
set_r8(emu, &modrm, result);
update_eflags_logical_ops_8bit(emu, result);
}
/*
* or r32 rm32: 2/3 bytes
* Logical inclusive OR between value of ModR/M and r32, storing result of destination.
* 1 byte: op (0B)
* 1/2 byte: ModR/M
*/
void or_r32_rm32(Emulator *emu)
{
emu->eip += 1;
ModRM modrm = create_modrm();
parse_modrm(emu, &modrm);
uint32_t r32_val = get_r32(emu, &modrm);
uint32_t rm32_val = get_rm32(emu, &modrm);
uint32_t result = r32_val | rm32_val;
set_r32(emu, &modrm, result);
update_eflags_logical_ops(emu, result);
}
/*
* or al imm8: 2 bytes
* Logical inclusive OR between imm8 and al, storing result to destination.
* 1 byte: op (0C)
* 1 byte: imm8
*/
void or_al_imm8(Emulator *emu)
{
uint8_t imm8_val = get_code8(emu, 1);
uint8_t al_val = get_register8(emu, AL);
uint8_t result = al_val | imm8_val;
set_register8(emu, AL, result);
update_eflags_logical_ops_8bit(emu, result);
emu->eip += 2;
}
/*
* or al imm32: 5 bytes
* Logical inclusive OR between imm32 to eax, storing result to destination.
* 1 byte: op (0D)
* 4 byte: imm32
*/
void or_eax_imm32(Emulator *emu)
{
uint32_t eax_val = get_register32(emu, EAX);
uint32_t imm32_val = get_code32(emu, 1);
uint32_t result = eax_val | imm32_val;
set_register32(emu, EAX, result);
update_eflags_logical_ops(emu, result);
emu->eip += 5;
}
/*
* push cs: 1 byte
* Pushes value of CS to stack.
* 1 byte: op (0E)
*/
void push_cs(Emulator *emu)
{
push_segment_register(emu, CS);
emu->eip += 1;
}