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use crate::cpu::Cpu;
pub const INSTRUCTIONS: [(fn(&mut Cpu), u8, &'static str); 256] = [
// 0x0 opcodes
(nop, 4, "NOP"),
(ld_bc_u16, 12, "LD BC, u16"),
(ld_mbc_a, 8, "LD [BC], A"),
(inc_bc, 8, "INC BC"),
(inc_b, 4, "INC B"),
(dec_b, 4, "DEC B"),
(ld_b_u8, 8, "LD B, u8"),
(rlca, 4, "RLCA"),
(ld_mu16_sp, 20, "LD [u16], SP"),
(add_hl_bc, 8, "ADD HL, BC"),
(dec_bc, 8, "DEC BC"),
(inc_c, 4, "INC C"),
(dec_c, 4, "DEC C"),
(ld_c_u8, 8, "LD C, u8"),
(dec_d, 4, "DEC D"),
(ld_d_u8, 8, "LD D, u8"),
(rla, 4, "RLA"),
(jr_i8, 12, "JR i8"),
(dec_e, 4, "DEC E"),
(ld_e_u8, 8, "LD E, u8"),
// 0x2 opcodes
(jr_nz_i8, 8, "JR NZ, i8"),
(ld_hl_u16, 12, "LD HL, u16"),
(ld_mhli_a, 8, "LD [HL+], A"),
(inc_hl, 8, "INC HL"),
(inc_h, 4, "INC H"),
(dec_h, 4, "DEC H"),
(ld_h_u8, 8, "LD H, u8"),
(ld_l_u8, 8, "LD L, u8"),
(cpl, 4, "CPL"),
// 0x3 opcodes
(jr_nc_i8, 8, "JR NC, i8"),
(ld_sp_u16, 12, "LD SP, u16"),
(ld_mhld_a, 8, "LD [HL-], A"),
(inc_sp, 8, "INC SP"),
(inc_mhl, 12, "INC [HL]"),
(ld_mhl_u8, 12, "LD [HL], u8 "),
(scf, 4, "SCF"),
(dec_a, 4, "DEC A"),
(ld_a_u8, 8, "LD A, u8"),
(ld_b_c, 4, "LD B, C"),
(ld_b_d, 4, "LD B, D"),
(ld_c_b, 4, "LD C, B"),
(ld_c_c, 4, "LD C, C"),
(ld_c_d, 4, "LD C, D"),
(ld_c_e, 4, "LD C, E"),
(ld_c_h, 4, "LD C, H"),
(ld_c_l, 4, "LD C, L"),
(ld_d_b, 4, "LD D, B"),
(ld_d_c, 4, "LD D, C"),
(ld_d_d, 4, "LD D, D"),
(ld_d_e, 4, "LD D, E"),
(ld_d_h, 4, "LD D, H"),
(ld_d_l, 4, "LD D, L"),
(ld_e_b, 4, "LD E, B"),
(ld_e_c, 4, "LD E, C"),
(ld_e_d, 4, "LD E, D"),
(ld_e_e, 4, "LD E, E"),
(ld_e_h, 4, "LD E, H"),
(ld_h_b, 4, "LD H, B"),
(ld_h_c, 4, "LD H, C"),
(ld_h_d, 4, "LD H, D"),
(ld_h_e, 4, "LD H, E"),
(ld_h_h, 4, "LD H, H"),
(ld_h_l, 4, "LD H, L"),
(ld_h_mhl, 8, "LD H, [HL]"),
(ld_l_b, 4, "LD L, B"),
(ld_l_c, 4, "LD L, C"),
(ld_l_d, 4, "LD L, D"),
(ld_l_e, 4, "LD L, E"),
(ld_l_h, 4, "LD L, H"),
(ld_l_l, 4, "LD L, L"),
(ld_mhl_b, 8, "LD [HL], B"),
(ld_mhl_c, 8, "LD [HL], C"),
(ld_mhl_d, 8, "LD [HL], D"),
(ld_mhl_h, 8, "LD [HL], H"),
(ld_mhl_l, 8, "LD [HL], L"),
(ld_mhl_a, 8, "LD [HL], A"),
(ld_a_b, 4, "LD A, B"),
(ld_a_c, 4, "LD A, C"),
(ld_a_e, 4, "LD A, E"),
(ld_a_h, 4, "LD A, H"),
(ld_a_l, 4, "LD A, L"),
(add_a_h, 4, "ADD A, H"),
(add_a_l, 4, "ADD A, L"),
(adc_a_b, 4, "ADC A, B"),
(adc_a_c, 4, "ADC A, C"),
(adc_a_d, 4, "ADC A, D"),
(adc_a_e, 4, "ADC A, E"),
(adc_a_h, 4, "ADC A, H"),
(adc_a_l, 4, "ADC A, L"),
(adc_a_mhl, 8, "ADC A, [HL]"),
(adc_a_a, 4, "ADC A, A"),
(sub_a_c, 4, "SUB A, C"),
(sub_a_d, 4, "SUB A, D"),
(sub_a_e, 4, "SUB A, E"),
(sub_a_h, 4, "SUB A, H"),
(sub_a_l, 4, "SUB A, L"),
(sub_a_mhl, 8, "SUB A, [HL]"),
(sbc_a_b, 4, "SBC A, B"),
(sbc_a_c, 4, "SBC A, C"),
(sbc_a_d, 4, "SBC A, D"),
(sbc_a_e, 4, "SBC A, E"),
(sbc_a_h, 4, "SBC A, H"),
(sbc_a_l, 4, "SBC A, L"),
(sbc_a_mhl, 8, "SBC A, [HL]"),
(sbc_a_a, 4, "SBC A, A"),
(and_a_d, 4, "AND A, D"),
(and_a_e, 4, "AND A, E"),
(and_a_h, 4, "AND A, H"),
(and_a_l, 4, "AND A, L"),
(and_a_mhl, 4, "AND A, [HL]"),
(and_a_a, 4, "AND A, A"),
(xor_a_d, 4, "XOR A, D"),
(xor_a_e, 4, "XOR A, E"),
(xor_a_h, 4, "XOR A, H"),
(xor_a_a, 4, "XOR A, A"),
// 0xb opcodes
(or_a_b, 4, "OR A, B"),
(or_a_c, 4, "OR A, C"),
(or_a_d, 4, "OR A, D"),
(or_a_e, 4, "OR A, E"),
(or_a_h, 4, "OR A, H"),
(or_a_l, 4, "OR A, L"),
(cp_a_b, 4, "CP A, B"),
(cp_a_c, 4, "CP A, C"),
(cp_a_d, 4, "CP A, D"),
(cp_a_e, 4, "CP A, E"),
(cp_a_h, 4, "CP A, H"),
(cp_a_l, 4, "CP A, L"),
// 0xc opcodes
(ret_nz, 8, "RET NZ"),
(pop_bc, 12, "POP BC"),
(jp_u16, 16, "JP u16"),
(call_nz_u16, 12, "CALL NZ, u16"),
(push_bc, 16, "PUSH BC"),
// 0xe opcodes
(ld_mff00u8_a, 12, "LD [FF00+u8], A"),
(illegal, 4, "ILLEGAL"),
(illegal, 4, "ILLEGAL"),
(illegal, 4, "ILLEGAL"),
(illegal, 4, "ILLEGAL"),
(illegal, 4, "ILLEGAL"),
// 0xf opcodes
(ld_a_mff00u8, 12, "LD A, [FF00+u8]"),
(illegal, 4, "ILLEGAL"),
(illegal, 4, "ILLEGAL"),
(cp_a_u8, 8, "CP A, u8"),
(rst_38h, 16, "RST 38h"),
];
pub const EXTENDED: [(fn(&mut Cpu), u8, &'static str); 256] = [
(rlc_b, 8, "RLC B"),
(rlc_c, 8, "RLC C"),
(rlc_d, 8, "RLC D"),
(rlc_e, 8, "RLC E"),
(rlc_h, 8, "RLC H"),
(rlc_l, 8, "RLC L"),
(rrc_b, 8, "RRC B"),
(rrc_c, 8, "RRC C"),
(rrc_d, 8, "RRC D"),
(rrc_e, 8, "RRC E"),
(rrc_h, 8, "RRC H"),
(rrc_l, 8, "RRC L"),
(rl_d, 8, "RL D"),
(rl_e, 8, "RL E"),
(rl_h, 8, "RL H"),
(rl_l, 8, "RL L"),
(rl_mhl, 16, "RL [HL]"),
(rl_a, 8, "RL A"),
(rr_b, 8, "RR B"),
(rr_c, 8, "RR C"),
(rr_d, 8, "RR D"),
(rr_h, 8, "RR H"),
(rr_l, 8, "RR L"),
(rr_mhl, 16, "RR [HL]"),
(rr_a, 8, "RR A"),
(sla_c, 8, "SLA C"),
(sla_d, 8, "SLA D"),
(sla_e, 8, "SLA E"),
(sla_h, 8, "SLA H"),
(sla_l, 8, "SLA L"),
(sla_mhl, 16, "SLA [HL]"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0x3 opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(swap_a, 8, "SWAP A"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0x4 opcodes
(bit_0_b, 8, "BIT 0, B"),
(bit_0_c, 8, "BIT 0, C"),
(bit_0_e, 8, "BIT 0, E"),
(bit_0_h, 8, "BIT 0, H"),
(bit_0_l, 8, "BIT 0, L"),
(bit_0_mhl, 12, "BIT 0, [HL]"),
(bit_0_a, 8, "BIT 0, A"),
(bit_1_b, 8, "BIT 1, B"),
(bit_1_c, 8, "BIT 1, C"),
(bit_1_d, 8, "BIT 1, D"),
(bit_1_e, 8, "BIT 1, E"),
(bit_1_h, 8, "BIT 1, H"),
(bit_1_l, 8, "BIT 1, L"),
(bit_1_mhl, 12, "BIT 1, [HL]"),
(bit_1_a, 8, "BIT 1, A"),
(bit_2_b, 8, "BIT 2, B"),
(bit_2_c, 8, "BIT 2, C"),
(bit_2_d, 8, "BIT 2, D"),
(bit_2_e, 8, "BIT 2, E"),
(bit_2_h, 8, "BIT 2, H"),
(bit_2_l, 8, "BIT 2, L"),
(bit_2_mhl, 12, "BIT 2, [HL]"),
(bit_2_a, 8, "BIT 2, A"),
(bit_3_b, 8, "BIT 3, B"),
(bit_3_c, 8, "BIT 3, C"),
(bit_3_d, 8, "BIT 3, D"),
(bit_3_e, 8, "BIT 3, E"),
(bit_3_h, 8, "BIT 3, H"),
(bit_3_l, 8, "BIT 3, L"),
(bit_3_mhl, 12, "BIT 3, [HL]"),
(bit_3_a, 8, "BIT 3, A"),
(bit_4_b, 8, "BIT 4, B"),
(bit_4_c, 8, "BIT 4, C"),
(bit_4_d, 8, "BIT 4, D"),
(bit_4_e, 8, "BIT 4, E"),
(bit_4_h, 8, "BIT 4, H"),
(bit_4_l, 8, "BIT 4, L"),
(bit_4_mhl, 12, "BIT 4, [HL]"),
(bit_4_a, 8, "BIT 4, A"),
(bit_5_b, 8, "BIT 5, B"),
(bit_5_c, 8, "BIT 5, C"),
(bit_5_d, 8, "BIT 5, D"),
(bit_5_e, 8, "BIT 5, E"),
(bit_5_h, 8, "BIT 5, H"),
(bit_5_l, 8, "BIT 5, L"),
(bit_5_mhl, 12, "BIT 5, [HL]"),
(bit_5_a, 8, "BIT 5, A"),
(bit_6_b, 8, "BIT 6, B"),
(bit_6_c, 8, "BIT 6, C"),
(bit_6_d, 8, "BIT 6, D"),
(bit_6_e, 8, "BIT 6, E"),
(bit_6_h, 8, "BIT 6, H"),
(bit_6_l, 8, "BIT 6, L"),
(bit_6_mhl, 12, "BIT 6, [HL]"),
(bit_6_a, 8, "BIT 6, A"),
(bit_7_b, 8, "BIT 7, B"),
(bit_7_c, 8, "BIT 7, C"),
(bit_7_d, 8, "BIT 7, D"),
(bit_7_e, 8, "BIT 7, E"),
(res_0_b, 8, "RES 0, B"),
(res_0_c, 8, "RES 0, C"),
(res_0_d, 8, "RES 0, D"),
(res_0_e, 8, "RES 0, E"),
(res_0_h, 8, "RES 0, H"),
(res_0_l, 8, "RES 0, L"),
(res_0_mhl, 16, "RES 0, A"),
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(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0x9 opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0xa opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0xb opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(res_7_b, 8, "RES 7, B"),
(res_7_c, 8, "RES 7, C"),
(res_7_d, 8, "RES 7, D"),
(res_7_e, 8, "RES 7, E"),
(res_7_h, 8, "RES 7, H"),
(res_7_l, 8, "RES 7, L"),
(res_7_mhl, 16, "RES 7, A"),
(res_7_a, 8, "RES 7, A"),
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// 0xc opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0xd opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
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(noimpl, 4, "! UNIMP !"),
// 0xe opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(set_4_a, 8, "SET 4, A"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
// 0xf opcodes
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
(noimpl, 4, "! UNIMP !"),
];
fn nop(_cpu: &mut Cpu) {}
fn noimpl(_cpu: &mut Cpu) {
let ten_millis = time::Duration::from_millis(10000);
thread::sleep(ten_millis); // @todo remove this hack
fn illegal(_cpu: &mut Cpu) {
panic!("Illegal instruction");
}
fn ld_bc_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.set_bc(word);
}
fn ld_mbc_a(cpu: &mut Cpu) {
cpu.mmu.write(cpu.bc(), cpu.a);
}
fn inc_bc(cpu: &mut Cpu) {
cpu.set_bc(cpu.bc().wrapping_add(1));
}
fn inc_b(cpu: &mut Cpu) {
let b = cpu.b;
let value = b.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
cpu.b = value;
}
fn dec_b(cpu: &mut Cpu) {
let b = cpu.b;
let value = b.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((b & 0xf) == 0x0);
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cpu.b = value;
}
fn ld_b_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.b = byte;
}
fn rlca(cpu: &mut Cpu) {
let carry = cpu.a >> 7;
cpu.a = cpu.a << 1 | carry;
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry(false);
cpu.set_carry(carry == 1);
}
fn ld_mu16_sp(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.mmu.write(word, cpu.sp as u8);
cpu.mmu.write(word + 1, (cpu.sp >> 8) as u8);
}
fn add_hl_bc(cpu: &mut Cpu) {
let value = add_u16_u16(cpu, cpu.hl(), cpu.bc());
cpu.set_hl(value);
}
fn ld_a_mbc(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.bc());
cpu.a = byte;
}
fn dec_bc(cpu: &mut Cpu) {
cpu.set_bc(cpu.bc().wrapping_sub(1));
}
fn inc_c(cpu: &mut Cpu) {
let value = cpu.c.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
cpu.c = value;
}
fn dec_c(cpu: &mut Cpu) {
let c = cpu.c;
let value = c.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((c & 0xf) == 0x0);
cpu.c = value;
}
fn ld_c_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.c = byte;
}
fn rrca(cpu: &mut Cpu) {
let carry = cpu.a & 0x1;
cpu.a = (cpu.a >> 1) | (carry << 7);
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry(false);
cpu.set_carry(carry != 0x0);
}
fn stop(cpu: &mut Cpu) {
cpu.stop();
}
fn ld_de_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.set_de(word);
}
fn ld_mde_a(cpu: &mut Cpu) {
cpu.mmu.write(cpu.de(), cpu.a);
}
fn inc_de(cpu: &mut Cpu) {
cpu.set_de(cpu.de().wrapping_add(1));
}
let d = cpu.d;
let value = d.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
fn dec_d(cpu: &mut Cpu) {
let d = cpu.d;
let value = d.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((d & 0xf) == 0x0);
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cpu.d = value;
}
fn ld_d_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.d = byte;
}
fn rla(cpu: &mut Cpu) {
let carry = cpu.get_carry();
cpu.set_carry(cpu.a & 0x80 == 0x80);
cpu.a = cpu.a << 1 | carry as u8;
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry(false);
}
fn jr_i8(cpu: &mut Cpu) {
let byte = cpu.read_u8() as i8;
cpu.pc = (cpu.pc as i16).wrapping_add(byte as i16) as u16;
}
fn add_hl_de(cpu: &mut Cpu) {
let value = add_u16_u16(cpu, cpu.hl(), cpu.de());
cpu.set_hl(value);
}
fn ld_a_mde(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.de());
cpu.a = byte;
}
fn dec_de(cpu: &mut Cpu) {
cpu.set_de(cpu.de().wrapping_sub(1));
}
let value = cpu.e.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
fn dec_e(cpu: &mut Cpu) {
let e = cpu.e;
let value = e.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((e & 0xf) == 0x0);
cpu.e = value;
}
fn ld_e_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.e = byte;
}
fn rra(cpu: &mut Cpu) {
let carry = cpu.get_carry();
cpu.set_carry(cpu.a & 0x01 == 0x01);
cpu.a = cpu.a >> 1 | ((carry as u8) << 7);
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry(false);
}
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fn jr_nz_i8(cpu: &mut Cpu) {
let byte = cpu.read_u8() as i8;
if cpu.get_zero() {
return;
}
cpu.pc = (cpu.pc as i16).wrapping_add(byte as i16) as u16;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn ld_hl_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.set_hl(word);
}
fn ld_mhli_a(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.a);
cpu.set_hl(cpu.hl().wrapping_add(1));
}
fn inc_hl(cpu: &mut Cpu) {
cpu.set_hl(cpu.hl().wrapping_add(1));
}
fn inc_h(cpu: &mut Cpu) {
let value = cpu.h.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
fn dec_h(cpu: &mut Cpu) {
let h = cpu.h;
let value = h.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((h & 0xf) == 0x0);
cpu.h = value;
}
fn ld_h_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.h = byte;
}
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fn daa(cpu: &mut Cpu) {
let a = cpu.a;
let mut adjust = 0;
if cpu.get_half_carry() {
adjust |= 0x06;
}
if cpu.get_carry() {
// Yes, we have to adjust it.
adjust |= 0x60;
}
let res = if cpu.get_sub() {
a.wrapping_sub(adjust)
} else {
if a & 0x0F > 0x09 {
adjust |= 0x06;
}
if a > 0x99 {
adjust |= 0x60;
}
a.wrapping_add(adjust)
};
cpu.a = res;
cpu.set_zero(res == 0);
cpu.set_half_carry(false);
cpu.set_carry(adjust & 0x60 == 0x60);
}
fn jr_z_i8(cpu: &mut Cpu) {
let byte = cpu.read_u8() as i8;
if !cpu.get_zero() {
return;
}
cpu.pc = (cpu.pc as i16).wrapping_add(byte as i16) as u16;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn add_hl_hl(cpu: &mut Cpu) {
let value = add_u16_u16(cpu, cpu.hl(), cpu.hl());
cpu.set_hl(value);
}
fn ld_a_mhli(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = byte;
cpu.set_hl(cpu.hl().wrapping_add(1));
}
fn dec_hl(cpu: &mut Cpu) {
cpu.set_hl(cpu.hl().wrapping_sub(1));
}
let l = cpu.l;
let value = l.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
fn dec_l(cpu: &mut Cpu) {
let l = cpu.l;
let value = l.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
fn ld_l_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.l = byte;
}
fn cpl(cpu: &mut Cpu) {
cpu.a = !cpu.a;
cpu.set_sub(true);
cpu.set_half_carry(true);
}
fn ld_sp_u16(cpu: &mut Cpu) {
cpu.sp = cpu.read_u16();
}
fn jr_nc_i8(cpu: &mut Cpu) {
if cpu.get_carry() {
return;
}
cpu.pc = (cpu.pc as i16).wrapping_add(byte as i16) as u16;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn ld_mhld_a(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.a);
cpu.set_hl(cpu.hl().wrapping_sub(1));
}
fn inc_sp(cpu: &mut Cpu) {
cpu.sp = cpu.sp.wrapping_add(1);
}
fn inc_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
let value = byte.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
cpu.set_half_carry((byte & 0xf) == 0xf);
cpu.mmu.write(cpu.hl(), value);
}
fn dec_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
let value = byte.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((byte & 0xf) == 0x0);
fn ld_mhl_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.mmu.write(cpu.hl(), byte);
}
fn scf(cpu: &mut Cpu) {
cpu.set_sub(false);
cpu.set_half_carry(false);
cpu.set_carry(true);
}
if !cpu.get_carry() {
return;
}
cpu.pc = (cpu.pc as i16).wrapping_add(byte as i16) as u16;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn add_hl_sp(cpu: &mut Cpu) {
let value = add_u16_u16(cpu, cpu.hl(), cpu.sp());
cpu.set_hl(value);
}
fn ld_a_mhld(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = byte;
cpu.set_hl(cpu.hl().wrapping_sub(1));
}
fn dec_sp(cpu: &mut Cpu) {
cpu.sp = cpu.sp.wrapping_sub(1);
}
let a = cpu.a;
let value = a.wrapping_add(1);
cpu.set_sub(false);
cpu.set_zero(value == 0);
fn dec_a(cpu: &mut Cpu) {
let a = cpu.a;
let value = a.wrapping_sub(1);
cpu.set_sub(true);
cpu.set_zero(value == 0);
cpu.set_half_carry((a & 0xf) == 0x0);
cpu.a = value;
}
fn ld_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = byte;
}
fn ccf(cpu: &mut Cpu) {
cpu.set_sub(false);
cpu.set_half_carry(false);
cpu.set_carry(!cpu.get_carry());
}
fn ld_b_b(cpu: &mut Cpu) {
cpu.b = cpu.b;
}
fn ld_b_c(cpu: &mut Cpu) {
cpu.b = cpu.c;
}
fn ld_b_d(cpu: &mut Cpu) {
cpu.b = cpu.d;
}
fn ld_b_e(cpu: &mut Cpu) {
cpu.b = cpu.e;
}
fn ld_b_h(cpu: &mut Cpu) {
cpu.b = cpu.h;
}
fn ld_b_l(cpu: &mut Cpu) {
cpu.b = cpu.l;
}
fn ld_b_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.b = byte;
}
fn ld_b_a(cpu: &mut Cpu) {
cpu.b = cpu.a;
}
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fn ld_c_b(cpu: &mut Cpu) {
cpu.c = cpu.b;
}
fn ld_c_c(cpu: &mut Cpu) {
cpu.c = cpu.c;
}
fn ld_c_d(cpu: &mut Cpu) {
cpu.c = cpu.d;
}
fn ld_c_e(cpu: &mut Cpu) {
cpu.c = cpu.e;
}
fn ld_c_h(cpu: &mut Cpu) {
cpu.c = cpu.h;
}
fn ld_c_l(cpu: &mut Cpu) {
cpu.c = cpu.l;
}
fn ld_c_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.c = byte;
}
fn ld_c_a(cpu: &mut Cpu) {
cpu.c = cpu.a;
}
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fn ld_d_b(cpu: &mut Cpu) {
cpu.d = cpu.b;
}
fn ld_d_c(cpu: &mut Cpu) {
cpu.d = cpu.c;
}
fn ld_d_d(cpu: &mut Cpu) {
cpu.d = cpu.d;
}
fn ld_d_e(cpu: &mut Cpu) {
cpu.d = cpu.e;
}
fn ld_d_h(cpu: &mut Cpu) {
cpu.d = cpu.h;
}
fn ld_d_l(cpu: &mut Cpu) {
cpu.d = cpu.l;
}
fn ld_d_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.d = byte;
}
fn ld_d_a(cpu: &mut Cpu) {
cpu.d = cpu.a;
}
fn ld_e_b(cpu: &mut Cpu) {
cpu.e = cpu.b;
}
fn ld_e_c(cpu: &mut Cpu) {
cpu.e = cpu.c;
}
fn ld_e_d(cpu: &mut Cpu) {
cpu.e = cpu.d;
}
fn ld_e_e(cpu: &mut Cpu) {
cpu.e = cpu.e;
}
fn ld_e_h(cpu: &mut Cpu) {
cpu.e = cpu.h;
}
fn ld_e_l(cpu: &mut Cpu) {
cpu.e = cpu.l;
}
fn ld_e_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.e = byte;
}
fn ld_e_a(cpu: &mut Cpu) {
cpu.e = cpu.a;
}
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fn ld_h_b(cpu: &mut Cpu) {
cpu.h = cpu.b;
}
fn ld_h_c(cpu: &mut Cpu) {
cpu.h = cpu.c;
}
fn ld_h_d(cpu: &mut Cpu) {
cpu.h = cpu.d;
}
fn ld_h_e(cpu: &mut Cpu) {
cpu.h = cpu.e;
}
fn ld_h_h(cpu: &mut Cpu) {
cpu.h = cpu.h;
}
fn ld_h_l(cpu: &mut Cpu) {
cpu.h = cpu.l;
}
fn ld_h_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.h = byte;
}
fn ld_h_a(cpu: &mut Cpu) {
cpu.h = cpu.a;
}
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fn ld_l_b(cpu: &mut Cpu) {
cpu.l = cpu.b;
}
fn ld_l_c(cpu: &mut Cpu) {
cpu.l = cpu.c;
}
fn ld_l_d(cpu: &mut Cpu) {
cpu.l = cpu.d;
}
fn ld_l_e(cpu: &mut Cpu) {
cpu.l = cpu.e;
}
fn ld_l_h(cpu: &mut Cpu) {
cpu.l = cpu.h;
}
fn ld_l_l(cpu: &mut Cpu) {
cpu.l = cpu.l;
}
fn ld_l_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.l = byte;
}
fn ld_l_a(cpu: &mut Cpu) {
cpu.l = cpu.a;
}
fn ld_mhl_b(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.b);
}
fn ld_mhl_c(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.c);
}
fn ld_mhl_d(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.d);
}
fn ld_mhl_e(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.e);
}
fn ld_mhl_h(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.h);
}
fn ld_mhl_l(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.l);
}
fn halt(cpu: &mut Cpu) {
cpu.halt();
}
fn ld_mhl_a(cpu: &mut Cpu) {
cpu.mmu.write(cpu.hl(), cpu.a);
}
fn ld_a_b(cpu: &mut Cpu) {
cpu.a = cpu.b;
}
fn ld_a_c(cpu: &mut Cpu) {
cpu.a = cpu.c;
}
fn ld_a_d(cpu: &mut Cpu) {
cpu.a = cpu.d;
}
fn ld_a_e(cpu: &mut Cpu) {
cpu.a = cpu.e;
}
fn ld_a_h(cpu: &mut Cpu) {
cpu.a = cpu.h;
}
fn ld_a_l(cpu: &mut Cpu) {
cpu.a = cpu.l;
}
fn ld_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = byte;
}
fn ld_a_a(cpu: &mut Cpu) {
cpu.a = cpu.a;
}
fn add_a_b(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.b);
}
fn add_a_c(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.c);
}
fn add_a_d(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.d);
}
fn add_a_e(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.e);
}
fn add_a_h(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.h);
}
fn add_a_l(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.l);
}
fn add_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = add_set_flags(cpu, cpu.a, byte);
}
fn add_a_a(cpu: &mut Cpu) {
cpu.a = add_set_flags(cpu, cpu.a, cpu.a);
}
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fn adc_a_b(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.b);
}
fn adc_a_c(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.c);
}
fn adc_a_d(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.d);
}
fn adc_a_e(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.e);
}
fn adc_a_h(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.h);
}
fn adc_a_l(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.l);
}
fn adc_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = add_carry_set_flags(cpu, cpu.a, byte);
}
fn adc_a_a(cpu: &mut Cpu) {
cpu.a = add_carry_set_flags(cpu, cpu.a, cpu.a);
}
fn sub_a_b(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.b);
}
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fn sub_a_c(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.c);
}
fn sub_a_d(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.d);
}
fn sub_a_e(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.e);
}
fn sub_a_h(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.h);
}
fn sub_a_l(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.l);
}
fn sub_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = sub_set_flags(cpu, cpu.a, byte);
}
fn sub_a_a(cpu: &mut Cpu) {
cpu.a = sub_set_flags(cpu, cpu.a, cpu.a);
}
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fn sbc_a_b(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.b);
}
fn sbc_a_c(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.c);
}
fn sbc_a_d(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.d);
}
fn sbc_a_e(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.e);
}
fn sbc_a_h(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.h);
}
fn sbc_a_l(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.l);
}
fn sbc_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a = sub_carry_set_flags(cpu, cpu.a, byte);
}
fn sbc_a_a(cpu: &mut Cpu) {
cpu.a = sub_carry_set_flags(cpu, cpu.a, cpu.a);
}
fn and_a_b(cpu: &mut Cpu) {
cpu.a &= cpu.b;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_c(cpu: &mut Cpu) {
cpu.a &= cpu.c;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
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fn and_a_d(cpu: &mut Cpu) {
cpu.a &= cpu.d;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_e(cpu: &mut Cpu) {
cpu.a &= cpu.e;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_h(cpu: &mut Cpu) {
cpu.a &= cpu.h;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_l(cpu: &mut Cpu) {
cpu.a &= cpu.l;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a &= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn and_a_a(cpu: &mut Cpu) {
cpu.a &= cpu.a;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn xor_a_b(cpu: &mut Cpu) {
cpu.a ^= cpu.b;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn xor_a_c(cpu: &mut Cpu) {
cpu.a ^= cpu.c;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
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fn xor_a_d(cpu: &mut Cpu) {
cpu.a ^= cpu.d;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn xor_a_e(cpu: &mut Cpu) {
cpu.a ^= cpu.e;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn xor_a_h(cpu: &mut Cpu) {
cpu.a ^= cpu.h;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn xor_a_l(cpu: &mut Cpu) {
cpu.a ^= cpu.l;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn xor_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a ^= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
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fn xor_a_a(cpu: &mut Cpu) {
cpu.a ^= cpu.a;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_b(cpu: &mut Cpu) {
cpu.a |= cpu.b;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_c(cpu: &mut Cpu) {
cpu.a |= cpu.c;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
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fn or_a_d(cpu: &mut Cpu) {
cpu.a |= cpu.d;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_e(cpu: &mut Cpu) {
cpu.a |= cpu.e;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_h(cpu: &mut Cpu) {
cpu.a |= cpu.h;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_l(cpu: &mut Cpu) {
cpu.a |= cpu.l;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
cpu.a |= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn or_a_a(cpu: &mut Cpu) {
cpu.a |= cpu.a;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
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fn cp_a_b(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.b);
}
fn cp_a_c(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.c);
}
fn cp_a_d(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.d);
}
fn cp_a_e(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.e);
}
fn cp_a_h(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.h);
}
fn cp_a_l(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.l);
}
fn cp_a_mhl(cpu: &mut Cpu) {
let byte = cpu.mmu.read(cpu.hl());
sub_set_flags(cpu, cpu.a, byte);
}
fn cp_a_a(cpu: &mut Cpu) {
sub_set_flags(cpu, cpu.a, cpu.a);
}
fn ret_nz(cpu: &mut Cpu) {
if cpu.get_zero() {
return;
}
cpu.pc = cpu.pop_word();
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn pop_bc(cpu: &mut Cpu) {
let word = cpu.pop_word();
cpu.set_bc(word);
}
fn jp_nz_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if cpu.get_zero() {
return;
}
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
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fn jp_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.pc = word;
}
fn call_nz_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if cpu.get_zero() {
return;
}
cpu.push_word(cpu.pc);
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn push_bc(cpu: &mut Cpu) {
cpu.push_word(cpu.bc());
}
fn add_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = add_set_flags(cpu, cpu.a, byte);
}
fn rst_00h(cpu: &mut Cpu) {
rst(cpu, 0x0000);
}
fn ret_z(cpu: &mut Cpu) {
if !cpu.get_zero() {
return;
}
cpu.pc = cpu.pop_word();
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn ret(cpu: &mut Cpu) {
cpu.pc = cpu.pop_word();
}
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fn jp_z_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if !cpu.get_zero() {
return;
}
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn call_z_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if !cpu.get_zero() {
return;
}
cpu.push_word(cpu.pc);
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn call_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.push_word(cpu.pc);
cpu.pc = word;
}
fn adc_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = add_carry_set_flags(cpu, cpu.a, byte);
}
fn rst_08h(cpu: &mut Cpu) {
rst(cpu, 0x0008);
}
fn ret_nc(cpu: &mut Cpu) {
if cpu.get_carry() {
return;
}
cpu.pc = cpu.pop_word();
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn pop_de(cpu: &mut Cpu) {
let word = cpu.pop_word();
cpu.set_de(word);
}
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fn jp_nc_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if cpu.get_carry() {
return;
}
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn call_nc_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if cpu.get_carry() {
return;
}
cpu.push_word(cpu.pc);
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn push_de(cpu: &mut Cpu) {
cpu.push_word(cpu.de());
}
fn sub_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = sub_set_flags(cpu, cpu.a, byte);
}
fn rst_10h(cpu: &mut Cpu) {
rst(cpu, 0x0010);
}
fn ret_c(cpu: &mut Cpu) {
if !cpu.get_carry() {
return;
}
cpu.pc = cpu.pop_word();
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn reti(cpu: &mut Cpu) {
cpu.pc = cpu.pop_word();
cpu.enable_int();
}
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fn jp_c_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if !cpu.get_carry() {
return;
}
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(4);
}
fn call_c_u16(cpu: &mut Cpu) {
let word = cpu.read_u16();
if !cpu.get_carry() {
return;
}
cpu.push_word(cpu.pc);
cpu.pc = word;
cpu.ticks = cpu.ticks.wrapping_add(12);
}
fn sbc_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = sub_carry_set_flags(cpu, cpu.a, byte);
}
fn rst_18h(cpu: &mut Cpu) {
rst(cpu, 0x0018);
}
fn ld_mff00u8_a(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.mmu.write(0xff00 + byte as u16, cpu.a);
}
fn pop_hl(cpu: &mut Cpu) {
let word = cpu.pop_word();
cpu.set_hl(word);
}
fn ld_mff00c_a(cpu: &mut Cpu) {
cpu.mmu.write(0xff00 + cpu.c as u16, cpu.a);
}
fn push_hl(cpu: &mut Cpu) {
cpu.push_word(cpu.hl());
}
fn and_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a &= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(true);
cpu.set_carry(false);
}
fn rst_20h(cpu: &mut Cpu) {
rst(cpu, 0x0020);
}
fn add_sp_i8(cpu: &mut Cpu) {
let sp = cpu.sp as i32;
let byte = cpu.read_u8() as i8;
let byte_i32 = byte as i32;
let result = sp.wrapping_add(byte_i32);
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry((sp ^ byte_i32 ^ result) & 0x10 == 0x10);
cpu.set_carry((sp ^ byte_i32 ^ result) & 0x100 == 0x100);
cpu.sp = result as u16;
}
fn jp_hl(cpu: &mut Cpu) {
cpu.pc = cpu.hl();
}
fn ld_mu16_a(cpu: &mut Cpu) {
let word = cpu.read_u16();
cpu.mmu.write(word, cpu.a);
}
fn xor_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a ^= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn rst_28h(cpu: &mut Cpu) {
rst(cpu, 0x0028);
}
fn ld_a_mff00u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a = cpu.mmu.read(0xff00 + byte as u16);
}
fn pop_af(cpu: &mut Cpu) {
let word = cpu.pop_word();
cpu.set_af(word);
}
fn ld_a_mff00c(cpu: &mut Cpu) {
cpu.a = cpu.mmu.read(0xff00 + cpu.c as u16);
}
fn di(cpu: &mut Cpu) {
cpu.disable_int();
}
fn push_af(cpu: &mut Cpu) {
cpu.push_word(cpu.af());
}
fn or_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
cpu.a |= byte;
cpu.set_sub(false);
cpu.set_zero(cpu.a == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
}
fn rst_30h(cpu: &mut Cpu) {
rst(cpu, 0x0030);
}
fn ld_hl_spi8(cpu: &mut Cpu) {
let sp = cpu.sp as i32;
let byte = cpu.read_u8() as i8;
let byte_i32 = byte as i32;
let result = sp.wrapping_add(byte_i32);
cpu.set_sub(false);
cpu.set_zero(false);
cpu.set_half_carry((sp ^ byte_i32 ^ result) & 0x10 == 0x10);
cpu.set_carry((sp ^ byte_i32 ^ result) & 0x100 == 0x100);
cpu.set_hl(result as u16);
}
fn ld_sp_hl(cpu: &mut Cpu) {
cpu.sp = cpu.hl();
}
fn ld_a_mu16(cpu: &mut Cpu) {
let word = cpu.read_u16();
let byte = cpu.mmu.read(word);
cpu.a = byte;
}
fn ei(cpu: &mut Cpu) {
cpu.enable_int();
}
fn cp_a_u8(cpu: &mut Cpu) {
let byte = cpu.read_u8();
sub_set_flags(cpu, cpu.a, byte);
}
fn rst_38h(cpu: &mut Cpu) {
rst(cpu, 0x0038);
}
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fn rlc_b(cpu: &mut Cpu) {
cpu.b = rlc(cpu, cpu.b);
}
fn rlc_c(cpu: &mut Cpu) {
cpu.c = rlc(cpu, cpu.c);
}
fn rlc_d(cpu: &mut Cpu) {
cpu.d = rlc(cpu, cpu.d);
}
fn rlc_e(cpu: &mut Cpu) {
cpu.e = rlc(cpu, cpu.e);
}
fn rlc_h(cpu: &mut Cpu) {
cpu.h = rlc(cpu, cpu.h);
}
fn rlc_l(cpu: &mut Cpu) {
cpu.l = rlc(cpu, cpu.l);
}
fn rlc_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let result = rlc(cpu, byte);
cpu.mmu.write(hl, result);
}
fn rlc_a(cpu: &mut Cpu) {
cpu.a = rlc(cpu, cpu.a);
}
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fn rrc_b(cpu: &mut Cpu) {
cpu.b = rrc(cpu, cpu.b);
}
fn rrc_c(cpu: &mut Cpu) {
cpu.c = rrc(cpu, cpu.c);
}
fn rrc_d(cpu: &mut Cpu) {
cpu.d = rrc(cpu, cpu.d);
}
fn rrc_e(cpu: &mut Cpu) {
cpu.e = rrc(cpu, cpu.e);
}
fn rrc_h(cpu: &mut Cpu) {
cpu.h = rrc(cpu, cpu.h);
}
fn rrc_l(cpu: &mut Cpu) {
cpu.l = rrc(cpu, cpu.l);
}
fn rrc_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let result = rrc(cpu, byte);
cpu.mmu.write(hl, result);
}
fn rrc_a(cpu: &mut Cpu) {
cpu.l = rrc(cpu, cpu.a);
}
fn rl_b(cpu: &mut Cpu) {
cpu.b = rl(cpu, cpu.b);
}
fn rl_c(cpu: &mut Cpu) {
cpu.c = rl(cpu, cpu.c);
}
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fn rl_d(cpu: &mut Cpu) {
cpu.d = rl(cpu, cpu.d);
}
fn rl_e(cpu: &mut Cpu) {
cpu.e = rl(cpu, cpu.e);
}
fn rl_h(cpu: &mut Cpu) {
cpu.h = rl(cpu, cpu.h);
}
fn rl_l(cpu: &mut Cpu) {
cpu.l = rl(cpu, cpu.l);
}
fn rl_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let result = rl(cpu, byte);
cpu.mmu.write(hl, result);
}
fn rl_a(cpu: &mut Cpu) {
cpu.a = rl(cpu, cpu.a);
}
fn rr_b(cpu: &mut Cpu) {
cpu.b = rr(cpu, cpu.b);
}
fn rr_c(cpu: &mut Cpu) {
cpu.c = rr(cpu, cpu.c);
}
fn rr_d(cpu: &mut Cpu) {
cpu.d = rr(cpu, cpu.d);
}
fn rr_e(cpu: &mut Cpu) {
cpu.e = rr(cpu, cpu.e);
}
fn rr_h(cpu: &mut Cpu) {
cpu.h = rr(cpu, cpu.h);
}
fn rr_l(cpu: &mut Cpu) {
cpu.l = rr(cpu, cpu.l);
}
fn rr_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let result = rr(cpu, byte);
cpu.mmu.write(hl, result);
}
fn rr_a(cpu: &mut Cpu) {
cpu.l = rr(cpu, cpu.a);
}
fn sla_b(cpu: &mut Cpu) {
cpu.b = sla(cpu, cpu.b);
}
fn sla_h(cpu: &mut Cpu) {
cpu.h = sla(cpu, cpu.h);
}
fn sla_l(cpu: &mut Cpu) {
cpu.l = sla(cpu, cpu.l);
}
fn sla_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let result = sla(cpu, byte);
cpu.mmu.write(hl, result);
}
fn sla_a(cpu: &mut Cpu) {
cpu.a = sla(cpu, cpu.a);
}
fn swap_a(cpu: &mut Cpu) {
cpu.a = swap(cpu, cpu.a)
}
fn srl_b(cpu: &mut Cpu) {
cpu.b = srl(cpu, cpu.b);
}
fn bit_0_b(cpu: &mut Cpu) {
bit_b(cpu, 0);
}
fn bit_0_c(cpu: &mut Cpu) {
bit_c(cpu, 0);
}
fn bit_0_d(cpu: &mut Cpu) {
bit_d(cpu, 0);
}
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fn bit_0_e(cpu: &mut Cpu) {
bit_e(cpu, 0);
}
fn bit_0_h(cpu: &mut Cpu) {
bit_h(cpu, 0);
}
fn bit_0_l(cpu: &mut Cpu) {
bit_l(cpu, 0);
}
fn bit_0_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 0);
}
fn bit_0_a(cpu: &mut Cpu) {
bit_a(cpu, 0);
}
fn bit_1_b(cpu: &mut Cpu) {
bit_b(cpu, 1);
}
fn bit_1_c(cpu: &mut Cpu) {
bit_c(cpu, 1);
}
fn bit_1_d(cpu: &mut Cpu) {
bit_d(cpu, 1);
}
fn bit_1_e(cpu: &mut Cpu) {
bit_e(cpu, 1);
}
fn bit_1_h(cpu: &mut Cpu) {
bit_h(cpu, 1);
}
fn bit_1_l(cpu: &mut Cpu) {
bit_l(cpu, 1);
}
fn bit_1_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 1);
}
fn bit_1_a(cpu: &mut Cpu) {
bit_a(cpu, 1);
}
fn bit_2_b(cpu: &mut Cpu) {
bit_b(cpu, 2);
}
fn bit_2_c(cpu: &mut Cpu) {
bit_c(cpu, 2);
}
fn bit_2_d(cpu: &mut Cpu) {
bit_d(cpu, 2);
}
fn bit_2_e(cpu: &mut Cpu) {
bit_e(cpu, 2);
}
fn bit_2_h(cpu: &mut Cpu) {
bit_h(cpu, 2);
}
fn bit_2_l(cpu: &mut Cpu) {
bit_l(cpu, 2);
}
fn bit_2_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 2);
}
fn bit_2_a(cpu: &mut Cpu) {
bit_a(cpu, 2);
}
fn bit_3_b(cpu: &mut Cpu) {
bit_b(cpu, 3);
}
fn bit_3_c(cpu: &mut Cpu) {
bit_c(cpu, 3);
}
fn bit_3_d(cpu: &mut Cpu) {
bit_d(cpu, 3);
}
fn bit_3_e(cpu: &mut Cpu) {
bit_e(cpu, 3);
}
fn bit_3_h(cpu: &mut Cpu) {
bit_h(cpu, 3);
}
fn bit_3_l(cpu: &mut Cpu) {
bit_l(cpu, 3);
}
fn bit_3_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 3);
}
fn bit_3_a(cpu: &mut Cpu) {
bit_a(cpu, 3);
}
fn bit_4_b(cpu: &mut Cpu) {
bit_b(cpu, 4);
}
fn bit_4_c(cpu: &mut Cpu) {
bit_c(cpu, 4);
}
fn bit_4_d(cpu: &mut Cpu) {
bit_d(cpu, 4);
}
fn bit_4_e(cpu: &mut Cpu) {
bit_e(cpu, 4);
}
fn bit_4_h(cpu: &mut Cpu) {
bit_h(cpu, 4);
}
fn bit_4_l(cpu: &mut Cpu) {
bit_l(cpu, 4);
}
fn bit_4_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 4);
}
fn bit_4_a(cpu: &mut Cpu) {
bit_a(cpu, 4);
}
fn bit_5_b(cpu: &mut Cpu) {
bit_b(cpu, 5);
}
fn bit_5_c(cpu: &mut Cpu) {
bit_c(cpu, 5);
}
fn bit_5_d(cpu: &mut Cpu) {
bit_d(cpu, 5);
}
fn bit_5_e(cpu: &mut Cpu) {
bit_e(cpu, 5);
}
fn bit_5_h(cpu: &mut Cpu) {
bit_h(cpu, 5);
}
fn bit_5_l(cpu: &mut Cpu) {
bit_l(cpu, 5);
}
fn bit_5_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 5);
}
fn bit_5_a(cpu: &mut Cpu) {
bit_a(cpu, 5);
}
fn bit_6_b(cpu: &mut Cpu) {
bit_b(cpu, 6);
}
fn bit_6_c(cpu: &mut Cpu) {
bit_c(cpu, 6);
}
fn bit_6_d(cpu: &mut Cpu) {
bit_d(cpu, 6);
}
fn bit_6_e(cpu: &mut Cpu) {
bit_e(cpu, 6);
}
fn bit_6_h(cpu: &mut Cpu) {
bit_h(cpu, 6);
}
fn bit_6_l(cpu: &mut Cpu) {
bit_l(cpu, 6);
}
fn bit_6_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 6);
}
fn bit_6_a(cpu: &mut Cpu) {
bit_a(cpu, 6);
}
fn bit_7_b(cpu: &mut Cpu) {
bit_b(cpu, 7);
}
fn bit_7_c(cpu: &mut Cpu) {
bit_c(cpu, 7);
}
fn bit_7_d(cpu: &mut Cpu) {
bit_d(cpu, 7);
}
fn bit_7_e(cpu: &mut Cpu) {
bit_e(cpu, 7);
}
fn bit_7_h(cpu: &mut Cpu) {
bit_h(cpu, 7);
}
fn bit_7_l(cpu: &mut Cpu) {
bit_l(cpu, 7);
}
fn bit_7_mhl(cpu: &mut Cpu) {
bit_mhl(cpu, 7);
}
fn bit_7_a(cpu: &mut Cpu) {
bit_a(cpu, 7);
}
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fn res_0_b(cpu: &mut Cpu) {
cpu.b = res(cpu.b, 0);
}
fn res_0_c(cpu: &mut Cpu) {
cpu.c = res(cpu.c, 0);
}
fn res_0_d(cpu: &mut Cpu) {
cpu.d = res(cpu.d, 0);
}
fn res_0_e(cpu: &mut Cpu) {
cpu.e = res(cpu.e, 0);
}
fn res_0_h(cpu: &mut Cpu) {
cpu.h = res(cpu.h, 0);
}
fn res_0_l(cpu: &mut Cpu) {
cpu.l = res(cpu.l, 0);
}
fn res_0_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let value = res(byte, 0);
cpu.mmu.write(hl, value);
}
fn res_0_a(cpu: &mut Cpu) {
cpu.a = res(cpu.a, 0);
}
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fn res_7_b(cpu: &mut Cpu) {
cpu.b = res(cpu.b, 7);
}
fn res_7_c(cpu: &mut Cpu) {
cpu.c = res(cpu.c, 7);
}
fn res_7_d(cpu: &mut Cpu) {
cpu.d = res(cpu.d, 7);
}
fn res_7_e(cpu: &mut Cpu) {
cpu.e = res(cpu.e, 7);
}
fn res_7_h(cpu: &mut Cpu) {
cpu.h = res(cpu.h, 7);
}
fn res_7_l(cpu: &mut Cpu) {
cpu.l = res(cpu.l, 7);
}
fn res_7_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let value = res(byte, 7);
cpu.mmu.write(hl, value);
}
fn res_7_a(cpu: &mut Cpu) {
cpu.a = res(cpu.a, 7);
}
fn set_3_mhl(cpu: &mut Cpu) {
let hl = cpu.hl();
let byte = cpu.mmu.read(hl);
let value = set(byte, 3);
cpu.mmu.write(hl, value);
}
fn set_4_a(cpu: &mut Cpu) {
cpu.a = set(cpu.a, 4);
}
/// Helper function to set one bit in a u8.
fn set(value: u8, bit: u8) -> u8 {
value | (1u8 << (bit as usize))
}
/// Helper function to clear one bit in a u8
fn res(value: u8, bit: u8) -> u8 {
value & !(1u8 << (bit as usize))
}
/// Helper function that rotates (shifts) left the given
/// byte (probably from a register) and updates the
/// proper flag registers.
fn rl(cpu: &mut Cpu, value: u8) -> u8 {
let result = (value << 1) | carry as u8;
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
result
}
fn rlc(cpu: &mut Cpu, value: u8) -> u8 {
cpu.set_carry(value & 0x80 == 0x80);
let result = (value << 1) | (value >> 7);
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
result
}
/// Helper function that rotates (shifts) right the given
/// byte (probably from a register) and updates the
/// proper flag registers.
fn rr(cpu: &mut Cpu, value: u8) -> u8 {
let carry = cpu.get_carry();
cpu.set_carry(value & 0x01 == 0x01);
let result = (value >> 1) | ((carry as u8) << 7);
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
result
}
fn rrc(cpu: &mut Cpu, value: u8) -> u8 {
cpu.set_carry(value & 0x01 == 0x01);
let result = (value >> 1) | (value << 7);
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
result
}
/// Helper function to test one bit in a u8.
/// Returns true if bit is 0.
fn bit_zero(val: u8, bit: u8) -> bool {
(val & (1u8 << (bit as usize))) == 0
}
fn bit_a(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.a, bit));
cpu.set_half_carry(true);
}
fn bit_b(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.b, bit));
cpu.set_half_carry(true);
}
fn bit_c(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.c, bit));
cpu.set_half_carry(true);
}
fn bit_d(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.d, bit));
cpu.set_half_carry(true);
}
fn bit_e(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.e, bit));
cpu.set_half_carry(true);
}
fn bit_h(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.h, bit));
cpu.set_half_carry(true);
}
fn bit_l(cpu: &mut Cpu, bit: u8) {
cpu.set_sub(false);
cpu.set_zero(bit_zero(cpu.l, bit));
cpu.set_half_carry(true);
}
fn bit_mhl(cpu: &mut Cpu, bit: u8) {
let byte = cpu.read_u8();
fn add_set_flags(cpu: &mut Cpu, first: u8, second: u8) -> u8 {
let first = first as u32;
let second = second as u32;
let result = first.wrapping_add(second);
let result_b = result as u8;
cpu.set_zero(result_b == 0);
cpu.set_half_carry((first ^ second ^ result) & 0x10 == 0x10);
cpu.set_carry(result & 0x100 == 0x100);
fn add_carry_set_flags(cpu: &mut Cpu, first: u8, second: u8) -> u8 {
let first = first as u32;
let second = second as u32;
let carry = cpu.get_carry() as u32;
let result = first.wrapping_add(second).wrapping_add(carry);
let result_b = result as u8;
cpu.set_sub(false);
cpu.set_zero(result_b == 0);
cpu.set_half_carry((first ^ second ^ result) & 0x10 == 0x10);
cpu.set_carry(result & 0x100 == 0x100);
result_b
}
fn sub_set_flags(cpu: &mut Cpu, first: u8, second: u8) -> u8 {
let first = first as u32;
let second = second as u32;
let result = first.wrapping_sub(second);
let result_b = result as u8;
cpu.set_zero(result_b == 0);
cpu.set_half_carry((first ^ second ^ result) & 0x10 == 0x10);
cpu.set_carry(result & 0x100 == 0x100);
fn sub_carry_set_flags(cpu: &mut Cpu, first: u8, second: u8) -> u8 {
let first = first as u32;
let second = second as u32;
let carry = cpu.get_carry() as u32;
let result = first.wrapping_sub(second).wrapping_sub(carry);
let result_b = result as u8;
cpu.set_sub(true);
cpu.set_zero(result_b == 0);
cpu.set_half_carry((first ^ second ^ result) & 0x10 == 0x10);
cpu.set_carry(result & 0x100 == 0x100);
result_b
}
fn add_u16_u16(cpu: &mut Cpu, first: u16, second: u16) -> u16 {
let first = first as u32;
let second = second as u32;
cpu.set_half_carry((first ^ second ^ result) & 0x1000 == 0x1000);
cpu.set_carry(result & 0x10000 == 0x10000);
}
fn swap(cpu: &mut Cpu, value: u8) -> u8 {
cpu.set_sub(false);
cpu.set_zero(value == 0);
cpu.set_half_carry(false);
cpu.set_carry(false);
(value << 4) | (value >> 4)
}
/// Helper function to shift an `u8` to the left and update CPU
/// flags.
fn sla(cpu: &mut Cpu, value: u8) -> u8 {
let result = value << 1;
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
cpu.set_carry(value & 0x80 != 0);
result
}
fn srl(cpu: &mut Cpu, value: u8) -> u8 {
let result = value >> 1;
cpu.set_sub(false);
cpu.set_zero(result == 0);
cpu.set_half_carry(false);
cpu.set_carry(value & 0x01 == 0x01);
result
}
/// Helper function for RST instructions, pushes the
/// current PC to the stack and jumps to the provided
/// address.
fn rst(cpu: &mut Cpu, addr: u16) {
cpu.push_word(cpu.pc);
cpu.pc = addr;
}