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rotate_shift_instructions.rs
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rotate_shift_instructions.rs
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use crate::cpu::gbc_cpu::*;
use crate::opcodes::opcodes_utils::*;
use crate::mmu::memory::Memory;
use crate::utils::bit_masks::*;
use log::info;
fn a_rotate_flags(cpu:&mut GbcCpu, carry:bool){
cpu.unset_flag(Flag::HalfCarry);
cpu.unset_flag(Flag::Subtraction);
cpu.unset_flag(Flag::Zero);
cpu.set_by_value(Flag::Carry, carry);
}
fn rotate_left(r:&mut u8)->bool{
let mut temp:u8 = *r;
*r = *r<<1;
temp = temp >> 7;
*r |= temp & BIT_0_MASK;
return temp != 0;
}
fn rotate_right(r:&mut u8)->bool{
let mut temp:u8 = *r;
*r = *r>>1;
temp = temp << 7;
*r |= temp & BIT_7_MASK;
return temp != 0;
}
fn rotate_left_carry(r:&mut u8, carry:bool)->bool{
let temp:u8 = *r;
*r = *r<<1;
if carry{
*r|=0x1
}
return (temp & BIT_7_MASK) != 0;
}
fn rotate_right_carry(r:&mut u8, carry:bool)->bool{
let temp:u8 = *r;
*r = *r>>1;
if carry{
*r|=0x80;
}
return (temp & BIT_0_MASK) != 0;
}
pub fn rlca(cpu:&mut GbcCpu){
let carry:bool = rotate_left(cpu.af.high());
a_rotate_flags(cpu, carry);
}
pub fn rla(cpu:&mut GbcCpu){
let carry_flag = cpu.get_flag(Flag::Carry);
let carry:bool = rotate_left_carry(cpu.af.high(), carry_flag);
a_rotate_flags(cpu, carry);
}
pub fn rrca(cpu:&mut GbcCpu){
let carry:bool = rotate_right(cpu.af.high());
a_rotate_flags(cpu, carry);
}
pub fn rra(cpu:&mut GbcCpu){
let carry_flag = cpu.get_flag(Flag::Carry);
let carry:bool = rotate_right_carry(cpu.af.high(), carry_flag);
a_rotate_flags(cpu, carry);
}
fn rotate_shift_flags(cpu:&mut GbcCpu, carry:bool, zero:bool){
cpu.unset_flag(Flag::HalfCarry);
cpu.unset_flag(Flag::Subtraction);
cpu.set_by_value(Flag::Zero, zero);
cpu.set_by_value(Flag::Carry, carry);
}
pub fn rlc_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let register:&mut u8 = get_src_register(cpu, opcode);
carry = rotate_left(register);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn rlc_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
let carry:bool = rotate_left(&mut byte);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
}
pub fn rl_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let carry_flag = cpu.get_flag(Flag::Carry);
let register:&mut u8 = get_src_register(cpu, opcode);
carry = rotate_left_carry(register, carry_flag);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn rl_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
//info!("rl hl: {} val: {:#X}", *cpu.hl.value(), byte);
let carry:bool = rotate_left_carry(&mut byte, cpu.get_flag(Flag::Carry));
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
//info!("val {:#X} flags {:#b}",byte, cpu.af.low());
}
pub fn rrc_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let register:&mut u8 = get_src_register(cpu, opcode);
carry = rotate_right(register);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn rrc_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
let carry:bool = rotate_right(&mut byte);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
}
pub fn rr_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let carry_flag = cpu.get_flag(Flag::Carry);
let register:&mut u8 = get_src_register(cpu, opcode);
carry = rotate_right_carry(register, carry_flag);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn rr_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
//debug
info!("rr_hl");
let mut byte: u8 = memory.read(*cpu.hl.value());
let carry_flag = cpu.get_flag(Flag::Carry);
let carry:bool = rotate_right_carry(&mut byte, carry_flag);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
}
fn shift_left(r:&mut u8)->bool{
let temp:u8 = *r;
*r = *r<<1;
return temp & BIT_7_MASK != 0;
}
fn arithmetic_shift_right(r:&mut u8)->bool{
let temp:u8 = *r;
*r = *r>>1;
*r |= temp & BIT_7_MASK;
return temp & BIT_0_MASK != 0;
}
fn logical_shift_right(r:&mut u8)->bool{
let temp:u8 = *r;
*r = *r>>1;
return temp & BIT_0_MASK != 0;
}
pub fn sla_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let register:&mut u8 = get_src_register(cpu, opcode);
carry = shift_left(register);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn sla_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
//debug
info!("sla hl: {} val: {:#X}", *cpu.hl.value(), byte);
let carry:bool = shift_left(&mut byte);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
//debug
info!("val {:#X} flags {:#b} hl {:#X}",byte, cpu.af.low(), *cpu.hl.value());
}
fn swap_nibbles(r:&mut u8){
let value = *r;
let mut temp:u8 = (value&0xF0)>>4;
temp |= (value &0xF)<<4;
*r = temp;
}
fn set_swap_flags(cpu:&mut GbcCpu, zero:bool){
cpu.unset_flag(Flag::HalfCarry);
cpu.unset_flag(Flag::Subtraction);
cpu.set_by_value(Flag::Zero,zero);
cpu.unset_flag(Flag::Carry);
}
pub fn swap_r(cpu:&mut GbcCpu, opcode:u16){
let value:u8;
let opcode:u8 = get_cb_opcode(opcode);
{
let register:&mut u8 = get_src_register(cpu, opcode);
swap_nibbles(register);
value = *register;
}
set_swap_flags(cpu, value == 0);
}
pub fn swap_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
swap_nibbles(&mut byte);
memory.write(*cpu.hl.value(), byte);
set_swap_flags(cpu, byte == 0);
}
pub fn sra_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let register:&mut u8 = get_src_register(cpu, opcode);
carry = arithmetic_shift_right(register);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn sra_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
let carry:bool = arithmetic_shift_right(&mut byte);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
}
pub fn srl_r(cpu:&mut GbcCpu, opcode:u16)
{
let opcode:u8 = get_cb_opcode(opcode);
let register_value:u8;
let carry:bool;
{
let register:&mut u8 = get_src_register(cpu, opcode);
carry = logical_shift_right(register);
register_value = *register;
}
rotate_shift_flags(cpu, carry, register_value == 0);
}
pub fn srl_hl(cpu:&mut GbcCpu, memory:&mut dyn Memory)
{
let mut byte: u8 = memory.read(*cpu.hl.value());
let carry:bool = logical_shift_right(&mut byte);
memory.write(*cpu.hl.value(), byte);
rotate_shift_flags(cpu, carry, byte == 0);
}