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instructions_10.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"
/*
* adc rm8 r8: 2|3 bytes (adc byte [eax], ah;)
* Adds values of ModR/M and carry flag to REG.
* 1 byte: op (10)
* 1|2 byte: ModR/M
*/
void adc_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)is_carry(emu);
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);
}
/*
* adc rm32 r32: 2|3 bytes
* Adds values of REG and carry flag to ModR/M.
* 1 byte: op (11)
* 1|2 byte: ModR/M
*/
void adc_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) + is_carry(emu);
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);
}
/*
* adc r8 rm8: 2|3 bytes
* Adds values of ModR/M and carry flag to r8.
* 1 byte: op (12)
* 1|2 byte: ModR/M
*/
void adc_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)is_carry(emu);
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);
}
/*
* adc r32 rm32: 2|3 bytes
* Adds values of ModR/M and carry flag to r32.
* 1 byte: op (13)
* 1|2 byte: ModR/M
*/
void adc_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) + is_carry(emu);
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);
}
/*
* adc al imm8: 2 bytes
* Adds imm8 and carry flag to al.
* 1 byte: op (14)
* 1 byte: imm8
*/
void adc_al_imm8(Emulator *emu)
{
uint8_t imm8_val = get_sign_code8(emu, 1);
uint8_t al_val = get_register8(emu, AL) + (uint8_t)is_carry(emu);
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;
}
/*
* adc al imm32: 5 bytes
* Adds imm32 and carry flag to eax.
* 1 byte: op (15)
* 4 byte: imm32
*/
void adc_eax_imm32(Emulator *emu)
{
uint32_t eax_val = get_register32(emu, EAX);
uint32_t imm32_val = get_sign_code32(emu, 1) + is_carry(emu);
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 ss: 1 byte
* Pushes value of SS to stack.
* 1 byte: op (16)
*/
void push_ss(Emulator *emu)
{
push_segment_register(emu, SS);
emu->eip += 1;
}
/*
* pop es: 1 byte
* Pops value from stack to SS.
* 1 byte: op (17)
*/
void pop_ss(Emulator *emu)
{
pop_segment_register(emu, SS);
emu->eip += 1;
}
/*
* sbb rm8 r8: 2|3 bytes (sbb byte [eax], ah;)
* Subtracts values of ModR/M and carry flag from REG.
* 1 byte: op (18)
* 1|2 byte: ModR/M
*/
void sbb_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)is_carry(emu);
uint16_t result = (uint16_t)rm8_val - (uint16_t)r8_val;
set_rm8(emu, &modrm, result);
update_eflags_sub_8bit(emu, rm8_val, r8_val, result);
}
/*
* sbb rm32 r32: 2|3 bytes
* Subtracts values of REG and carry flag from ModR/M.
* 1 byte: op (19)
* 1|2 byte: ModR/M
*/
void sbb_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) + is_carry(emu);
uint64_t result = (uint64_t)rm32_val - (uint64_t)r32_val;
set_rm32(emu, &modrm, result);
update_eflags_sub(emu, rm32_val, r32_val, result);
}
/*
* sbb r8 rm8: 2|3 bytes
* Subtracts values of ModR/M and carry flag from r8.
* 1 byte: op (1A)
* 1|2 byte: ModR/M
*/
void sbb_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)is_carry(emu);
uint16_t result = (uint16_t)r8_val - (uint16_t)rm8_val;
set_r8(emu, &modrm, result);
update_eflags_sub_8bit(emu, r8_val, rm8_val, result);
}
/*
* sbb r32 rm32: 2|3 bytes
* Subtracts values of ModR/M and carry flag from r32.
* 1 byte: op (1B)
* 1|2 byte: ModR/M
*/
void sbb_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) + is_carry(emu);
uint64_t result = (uint64_t)r32_val - (uint64_t)rm32_val;
set_r32(emu, &modrm, result);
update_eflags_sub(emu, r32_val, rm32_val, result);
}
/*
* sbb al imm8: 2 bytes
* Subtracts imm8 and carry flag from al.
* 1 byte: op (1C)
* 1 byte: imm8
*/
void sbb_al_imm8(Emulator *emu)
{
uint8_t imm8_val = get_sign_code8(emu, 1);
uint8_t al_val = get_register8(emu, AL) + (uint8_t)is_carry(emu);
uint16_t result = (uint16_t)al_val - (uint16_t)imm8_val;
set_register8(emu, AL, result);
update_eflags_sub_8bit(emu, al_val, imm8_val, result);
emu->eip += 2;
}
/*
* sbb al imm32: 5 bytes
* Subtracts imm32 and carry flag from eax.
* 1 byte: op (1D)
* 4 byte: imm32
*/
void sbb_eax_imm32(Emulator *emu)
{
uint32_t eax_val = get_register32(emu, EAX);
uint32_t imm32_val = get_sign_code32(emu, 1) + is_carry(emu);
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 ds: 1 byte
* Pushes value of DS to stack.
* 1 byte: op (1E)
*/
void push_ds(Emulator *emu)
{
push_segment_register(emu, DS);
emu->eip += 1;
}
/*
* pop ds: 1 byte
* Pops value from stack to DS.
* 1 byte: op (1F)
*/
void pop_ds(Emulator *emu)
{
pop_segment_register(emu, DS);
emu->eip += 1;
}