diff --git a/src/cpu.rs b/src/cpu.rs
index a56d2de9bd262873c95d050dac41d74aae050ccb..160d07bb6185fe5db0acc4d4993c67b375f08e68 100644
--- a/src/cpu.rs
+++ b/src/cpu.rs
@@ -1,488 +1,27 @@
-use crate::{mmu::Mmu, ppu::Ppu};
+use crate::{
+ inst::{BITWISE, INSTRUCTIONS},
+ mmu::Mmu,
+ ppu::Ppu,
+};
pub const PREFIX: u8 = 0xcb;
-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"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (inc_c, 4, "INC C"),
- (dec_c, 4, "DEC C"),
- (ld_c_u8, 8, "LD C, u8"),
- (noimpl, 4, "! UNIMP !"),
- // 0x1 opcodes
- (noimpl, 4, "! UNIMP !"),
- (ld_de_u16, 12, "LD DE, u16"),
- (noimpl, 4, "! UNIMP !"),
- (inc_de, 8, "INC DE"),
- (noimpl, 4, "! UNIMP !"),
- (dec_d, 4, "DEC D"),
- (noimpl, 4, "! UNIMP !"),
- (rla, 4, "RLA"),
- (jr_i8, 12, "JR i8"),
- (noimpl, 4, "! UNIMP !"),
- (ld_a_mde, 8, "LD A, [DE]"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (dec_e, 4, "DEC E"),
- (ld_e_u8, 8, "LD E, u8"),
- (noimpl, 4, "! UNIMP !"),
- // 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"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (jr_z_i8, 8, "JR Z, i8"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_l_u8, 8, "LD L, u8"),
- (noimpl, 4, "! UNIMP !"),
- // 0x3 opcodes
- (noimpl, 4, "! UNIMP !"),
- (ld_sp_u16, 12, "LD SP, u16"),
- (ld_mhld_a, 8, "LD [HL-], 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 !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (dec_a, 4, "DEC A"),
- (ld_a_u8, 8, "LD A, u8"),
- (noimpl, 4, "! UNIMP !"),
- // 0x4 opcodes
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_b_h, 4, "LD B, H"),
- (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 !"),
- (ld_c_a, 4, "LD C, A"),
- // 0x5 opcodes
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_d_a, 4, "LD D, 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 !"),
- // 0x6 opcodes
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_h_a, 4, "LD H, 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 !"),
- // 0x7 opcodes
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_mhl_a, 8, "LD [HL], A"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_a_e, 4, "LD A, E"),
- (ld_a_h, 4, "LD A, H"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- // 0x8 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 !"),
- // 0x9 opcodes
- (sub_a_b, 4, "SUB A, B"),
- (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 !"),
- (xor_a_a, 4, "XOR A, A"),
- // 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 !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- // 0xc opcodes
- (ret_nz, 8, "RET NZ"),
- (pop_bc, 12, "POP BC"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (push_bc, 16, "PUSH BC"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ret, 16, "RET"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (call_u16, 24, "CALL u16"),
- (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 !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- // 0xe opcodes
- (ld_mff00u8_a, 12, "LD [FF00+u8], A"),
- (noimpl, 4, "! UNIMP !"),
- (ld_mff00c_a, 8, "LD [FF00+C], A"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (ld_mu16_a, 16, "LD [u16], A"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- // 0xf opcodes
- (ld_a_mff00u8, 12, "LD A, [FF00+u8]"),
- (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 !"),
- (cp_a_u8, 8, "CP A, u8"),
- (noimpl, 4, "! UNIMP !"),
-];
-
-pub const BITWISE: [(fn(&mut Cpu), u8, &'static str); 176] = [
- // 0x0 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 !"),
- // 0x1 opcodes
- (noimpl, 4, "! UNIMP !"),
- (rl_c, 8, "RL C"),
- (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 !"),
- // 0x2 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 !"),
- // 0x3 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 !"),
- // 0x4 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 !"),
- // 0x5 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 !"),
- // 0x6 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 !"),
- // 0x7 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 !"),
- (bit_7_h, 8, "BIT 7, H"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- (noimpl, 4, "! UNIMP !"),
- // 0x8 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 !"),
- // 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 !"),
-];
-
pub struct Cpu {
- pc: u16,
- sp: u16,
- a: u8,
- b: u8,
- c: u8,
- d: u8,
- e: u8,
- h: u8,
- l: u8,
+ pub pc: u16,
+ pub sp: u16,
+ pub a: u8,
+ pub b: u8,
+ pub c: u8,
+ pub d: u8,
+ pub e: u8,
+ pub h: u8,
+ pub l: u8,
zero: bool,
sub: bool,
half_carry: bool,
carry: bool,
- mmu: Mmu,
- ticks: u32,
+ pub mmu: Mmu,
+ pub ticks: u32,
}
impl Cpu {
@@ -538,7 +77,7 @@ impl Cpu {
println!("GOING TO PLAY BOOT SOUND");
}
- if pc == 0x008f {
+ if pc == 0x00e0 {
println!("GOING TO PLAY BOOT 0x00e0");
}
@@ -579,17 +118,17 @@ impl Cpu {
}
#[inline(always)]
- fn af(&self) -> u16 {
+ pub fn af(&self) -> u16 {
(self.a as u16) << 8 | self.f() as u16
}
#[inline(always)]
- fn bc(&self) -> u16 {
+ pub fn bc(&self) -> u16 {
(self.b as u16) << 8 | self.c as u16
}
#[inline(always)]
- fn f(&self) -> u8 {
+ pub fn f(&self) -> u8 {
let mut f = 0x0u8;
if self.zero {
f |= 0x80;
@@ -607,42 +146,42 @@ impl Cpu {
}
#[inline(always)]
- fn set_bc(&mut self, value: u16) {
+ pub fn set_bc(&mut self, value: u16) {
self.b = (value >> 8) as u8;
self.c = value as u8;
}
#[inline(always)]
- fn de(&self) -> u16 {
+ pub fn de(&self) -> u16 {
(self.d as u16) << 8 | self.e as u16
}
#[inline(always)]
- fn set_de(&mut self, value: u16) {
+ pub fn set_de(&mut self, value: u16) {
self.d = (value >> 8) as u8;
self.e = value as u8;
}
#[inline(always)]
- fn hl(&self) -> u16 {
+ pub fn hl(&self) -> u16 {
(self.h as u16) << 8 | self.l as u16
}
#[inline(always)]
- fn set_hl(&mut self, value: u16) {
+ pub fn set_hl(&mut self, value: u16) {
self.h = (value >> 8) as u8;
self.l = value as u8;
}
#[inline(always)]
- fn read_u8(&mut self) -> u8 {
+ pub fn read_u8(&mut self) -> u8 {
let byte = self.mmu.read(self.pc);
self.pc = self.pc.wrapping_add(1);
byte
}
#[inline(always)]
- fn read_u16(&mut self) -> u16 {
+ pub fn read_u16(&mut self) -> u16 {
let byte1 = self.read_u8();
let byte2 = self.read_u8();
let word = byte1 as u16 | ((byte2 as u16) << 8);
@@ -650,452 +189,67 @@ impl Cpu {
}
#[inline(always)]
- fn push_byte(&mut self, byte: u8) {
+ pub fn push_byte(&mut self, byte: u8) {
self.sp = self.sp.wrapping_sub(1);
self.mmu.write(self.sp, byte);
}
#[inline(always)]
- fn push_word(&mut self, word: u16) {
+ pub fn push_word(&mut self, word: u16) {
self.push_byte((word >> 8) as u8);
self.push_byte(word as u8);
}
#[inline(always)]
- fn pop_byte(&mut self) -> u8 {
+ pub fn pop_byte(&mut self) -> u8 {
let byte = self.mmu.read(self.sp);
self.sp = self.sp.wrapping_add(1);
byte
}
#[inline(always)]
- fn pop_word(&mut self) -> u16 {
+ pub fn pop_word(&mut self) -> u16 {
let word = self.pop_byte() as u16 | ((self.pop_byte() as u16) << 8);
word
}
#[inline(always)]
- fn get_zero(&self) -> bool {
+ pub fn get_zero(&self) -> bool {
self.zero
}
#[inline(always)]
- fn set_zero(&mut self, value: bool) {
+ pub fn set_zero(&mut self, value: bool) {
self.zero = value
}
#[inline(always)]
- fn get_sub(&self) -> bool {
+ pub fn get_sub(&self) -> bool {
self.sub
}
#[inline(always)]
- fn set_sub(&mut self, value: bool) {
+ pub fn set_sub(&mut self, value: bool) {
self.sub = value;
}
#[inline(always)]
- fn get_half_carry(&self) -> bool {
+ pub fn get_half_carry(&self) -> bool {
self.half_carry
}
#[inline(always)]
- fn set_half_carry(&mut self, value: bool) {
+ pub fn set_half_carry(&mut self, value: bool) {
self.half_carry = value
}
#[inline(always)]
- fn get_carry(&self) -> bool {
+ pub fn get_carry(&self) -> bool {
self.carry
}
#[inline(always)]
- fn set_carry(&mut self, value: bool) {
+ pub fn set_carry(&mut self, value: bool) {
self.carry = value;
}
}
-
-fn nop(_cpu: &mut Cpu) {}
-
-fn noimpl(_cpu: &mut Cpu) {
- todo!("Instruction not implemented");
-}
-
-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 value = cpu.b.wrapping_add(1);
-
- cpu.set_sub(false);
- cpu.set_zero(value == 0);
- cpu.set_half_carry((value & 0xf) == 0xf);
-
- 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) == 0xf);
-
- 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 inc_c(cpu: &mut Cpu) {
- let value = cpu.c.wrapping_add(1);
-
- cpu.set_sub(false);
- cpu.set_zero(value == 0);
- cpu.set_half_carry((value & 0xf) == 0xf);
-
- 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) == 0xf);
-
- cpu.c = value;
-}
-
-fn ld_c_u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.c = byte;
-}
-
-fn ld_de_u16(cpu: &mut Cpu) {
- let word = cpu.read_u16();
- cpu.set_de(word);
-}
-
-fn inc_de(cpu: &mut Cpu) {
- cpu.set_de(cpu.de().wrapping_add(1));
-}
-
-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) == 0xf);
-
- cpu.d = value;
-}
-
-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 ld_a_mde(cpu: &mut Cpu) {
- let byte = cpu.mmu.read(cpu.de());
- cpu.a = byte;
-}
-
-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) == 0xf);
-
- cpu.e = value;
-}
-
-fn ld_e_u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.e = byte;
-}
-
-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);
- cpu.set_half_carry((value & 0xf) == 0xf);
-
- cpu.h = value;
-}
-
-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 ld_l_u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.l = byte;
-}
-
-fn ld_sp_u16(cpu: &mut Cpu) {
- cpu.sp = cpu.read_u16();
-}
-
-fn ld_mhld_a(cpu: &mut Cpu) {
- cpu.mmu.write(cpu.hl(), cpu.a);
- cpu.set_hl(cpu.hl().wrapping_sub(1));
-}
-
-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) == 0xf);
-
- cpu.a = value;
-}
-
-fn ld_a_u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.a = byte;
-}
-
-fn ld_b_h(cpu: &mut Cpu) {
- cpu.b = cpu.h;
-}
-
-fn ld_c_a(cpu: &mut Cpu) {
- cpu.c = cpu.a;
-}
-
-fn ld_d_a(cpu: &mut Cpu) {
- cpu.d = cpu.a;
-}
-
-fn ld_h_a(cpu: &mut Cpu) {
- cpu.h = cpu.a;
-}
-
-fn ld_mhl_a(cpu: &mut Cpu) {
- cpu.mmu.write(cpu.hl(), cpu.a);
-}
-
-fn ld_a_e(cpu: &mut Cpu) {
- cpu.a = cpu.e;
-}
-
-fn ld_a_h(cpu: &mut Cpu) {
- cpu.a = cpu.h;
-}
-
-fn sub_a_b(cpu: &mut Cpu) {
- cpu.a = sub_set_flags(cpu, cpu.a, cpu.b);
-}
-
-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 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 push_bc(cpu: &mut Cpu) {
- cpu.push_word(cpu.bc());
-}
-
-fn ret(cpu: &mut Cpu) {
- cpu.pc = cpu.pop_word();
-}
-
-fn call_u16(cpu: &mut Cpu) {
- let word = cpu.read_u16();
- cpu.push_word(cpu.pc);
- cpu.pc = word;
-}
-
-fn ld_mff00u8_a(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.mmu.write(0xff00 + byte as u16, cpu.a);
-}
-
-fn ld_mff00c_a(cpu: &mut Cpu) {
- cpu.mmu.write(0xff00 + cpu.c as u16, cpu.a);
-}
-
-fn ld_mu16_a(cpu: &mut Cpu) {
- let word = cpu.read_u16();
- cpu.mmu.write(word, cpu.a);
-}
-
-fn ld_a_mff00u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- cpu.a = cpu.mmu.read(0xff00 + byte as u16);
-}
-
-fn cp_a_u8(cpu: &mut Cpu) {
- let byte = cpu.read_u8();
- sub_set_flags(cpu, cpu.a, byte);
-}
-
-fn rl_c(cpu: &mut Cpu) {
- cpu.c = rl(cpu, cpu.c);
-}
-
-fn bit_7_h(cpu: &mut Cpu) {
- bit_h(cpu, 7);
-}
-
-/// Helper function that rotates (shifts) the given
-/// byte (probably from a register) and updates the
-/// proper flag registers.
-fn rl(cpu: &mut Cpu, byte: u8) -> u8 {
- let carry = cpu.get_carry();
-
- cpu.set_carry(byte & 0x80 == 0x80);
-
- let result = (byte << 1) | carry as u8;
-
- 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_h(cpu: &mut Cpu, bit: u8) {
- cpu.set_sub(false);
- cpu.set_zero(bit_zero(cpu.h, bit));
- cpu.set_half_carry(true);
-}
-
-fn sub_set_flags(cpu: &mut Cpu, x: u8, y: u8) -> u8 {
- // checks for borrow using 32bit arithmetics
- let x = x as u32;
- let y = y as u32;
-
- let value = x.wrapping_sub(y);
- let value_b = value as u8;
-
- cpu.set_sub(true);
- cpu.set_carry(value & 0x100 == 0x100);
- cpu.set_zero(value_b == 0);
- cpu.set_half_carry((x ^ y ^ value) & 0x10 == 0x10);
-
- value_b
-}
-
-fn add_u16_u16(cpu: &mut Cpu, first: u16, second: u16) -> u16 {
- let first = first as u32;
- let second = second as u32;
- let value = first.wrapping_add(second);
-
- cpu.set_sub(false);
- cpu.set_carry(value & 0x10000 == 0x10000);
- cpu.set_half_carry((first ^ second ^ value) & 0x1000 == 0x1000);
-
- value as u16
-}
diff --git a/src/inst.rs b/src/inst.rs
new file mode 100644
index 0000000000000000000000000000000000000000..1e72237747b2e763e5f16f2a44b663377e2868e1
--- /dev/null
+++ b/src/inst.rs
@@ -0,0 +1,856 @@
+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"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (inc_c, 4, "INC C"),
+ (dec_c, 4, "DEC C"),
+ (ld_c_u8, 8, "LD C, u8"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0x1 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (ld_de_u16, 12, "LD DE, u16"),
+ (noimpl, 4, "! UNIMP !"),
+ (inc_de, 8, "INC DE"),
+ (noimpl, 4, "! UNIMP !"),
+ (dec_d, 4, "DEC D"),
+ (ld_d_u8, 8, "LD D, u8"),
+ (rla, 4, "RLA"),
+ (jr_i8, 12, "JR i8"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_a_mde, 8, "LD A, [DE]"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (dec_e, 4, "DEC E"),
+ (ld_e_u8, 8, "LD E, u8"),
+ (noimpl, 4, "! UNIMP !"),
+ // 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"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (jr_z_i8, 8, "JR Z, i8"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_l_u8, 8, "LD L, u8"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0x3 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (ld_sp_u16, 12, "LD SP, u16"),
+ (ld_mhld_a, 8, "LD [HL-], 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 !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (dec_a, 4, "DEC A"),
+ (ld_a_u8, 8, "LD A, u8"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0x4 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_b_h, 4, "LD B, H"),
+ (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 !"),
+ (ld_c_a, 4, "LD C, A"),
+ // 0x5 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_d_a, 4, "LD D, 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 !"),
+ // 0x6 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_h_a, 4, "LD H, 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 !"),
+ // 0x7 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_mhl_a, 8, "LD [HL], A"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_a_e, 4, "LD A, E"),
+ (ld_a_h, 4, "LD A, H"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0x8 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 !"),
+ // 0x9 opcodes
+ (sub_a_b, 4, "SUB A, B"),
+ (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 !"),
+ (xor_a_a, 4, "XOR A, A"),
+ // 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 !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0xc opcodes
+ (ret_nz, 8, "RET NZ"),
+ (pop_bc, 12, "POP BC"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (push_bc, 16, "PUSH BC"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ret, 16, "RET"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (call_u16, 24, "CALL u16"),
+ (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 !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0xe opcodes
+ (ld_mff00u8_a, 12, "LD [FF00+u8], A"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_mff00c_a, 8, "LD [FF00+C], A"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (ld_mu16_a, 16, "LD [u16], A"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0xf opcodes
+ (ld_a_mff00u8, 12, "LD A, [FF00+u8]"),
+ (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 !"),
+ (cp_a_u8, 8, "CP A, u8"),
+ (noimpl, 4, "! UNIMP !"),
+];
+
+pub const BITWISE: [(fn(&mut Cpu), u8, &'static str); 176] = [
+ // 0x0 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 !"),
+ // 0x1 opcodes
+ (noimpl, 4, "! UNIMP !"),
+ (rl_c, 8, "RL C"),
+ (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 !"),
+ // 0x2 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 !"),
+ // 0x3 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 !"),
+ // 0x4 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 !"),
+ // 0x5 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 !"),
+ // 0x6 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 !"),
+ // 0x7 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 !"),
+ (bit_7_h, 8, "BIT 7, H"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ (noimpl, 4, "! UNIMP !"),
+ // 0x8 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 !"),
+ // 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 !"),
+];
+
+fn nop(_cpu: &mut Cpu) {}
+
+fn noimpl(_cpu: &mut Cpu) {
+ todo!("Instruction not implemented");
+}
+
+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 value = cpu.b.wrapping_add(1);
+
+ cpu.set_sub(false);
+ cpu.set_zero(value == 0);
+ cpu.set_half_carry((value & 0xf) == 0xf);
+
+ 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) == 0xf);
+
+ 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 inc_c(cpu: &mut Cpu) {
+ let value = cpu.c.wrapping_add(1);
+
+ cpu.set_sub(false);
+ cpu.set_zero(value == 0);
+ cpu.set_half_carry((value & 0xf) == 0xf);
+
+ 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) == 0xf);
+
+ cpu.c = value;
+}
+
+fn ld_c_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.c = byte;
+}
+
+fn ld_de_u16(cpu: &mut Cpu) {
+ let word = cpu.read_u16();
+ cpu.set_de(word);
+}
+
+fn inc_de(cpu: &mut Cpu) {
+ cpu.set_de(cpu.de().wrapping_add(1));
+}
+
+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) == 0xf);
+
+ 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 ld_a_mde(cpu: &mut Cpu) {
+ let byte = cpu.mmu.read(cpu.de());
+ cpu.a = byte;
+}
+
+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) == 0xf);
+
+ cpu.e = value;
+}
+
+fn ld_e_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.e = byte;
+}
+
+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);
+ cpu.set_half_carry((value & 0xf) == 0xf);
+
+ cpu.h = value;
+}
+
+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 ld_l_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.l = byte;
+}
+
+fn ld_sp_u16(cpu: &mut Cpu) {
+ cpu.sp = cpu.read_u16();
+}
+
+fn ld_mhld_a(cpu: &mut Cpu) {
+ cpu.mmu.write(cpu.hl(), cpu.a);
+ cpu.set_hl(cpu.hl().wrapping_sub(1));
+}
+
+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) == 0xf);
+
+ cpu.a = value;
+}
+
+fn ld_a_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.a = byte;
+}
+
+fn ld_b_h(cpu: &mut Cpu) {
+ cpu.b = cpu.h;
+}
+
+fn ld_c_a(cpu: &mut Cpu) {
+ cpu.c = cpu.a;
+}
+
+fn ld_d_a(cpu: &mut Cpu) {
+ cpu.d = cpu.a;
+}
+
+fn ld_h_a(cpu: &mut Cpu) {
+ cpu.h = cpu.a;
+}
+
+fn ld_mhl_a(cpu: &mut Cpu) {
+ cpu.mmu.write(cpu.hl(), cpu.a);
+}
+
+fn ld_a_e(cpu: &mut Cpu) {
+ cpu.a = cpu.e;
+}
+
+fn ld_a_h(cpu: &mut Cpu) {
+ cpu.a = cpu.h;
+}
+
+fn sub_a_b(cpu: &mut Cpu) {
+ cpu.a = sub_set_flags(cpu, cpu.a, cpu.b);
+}
+
+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 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 push_bc(cpu: &mut Cpu) {
+ cpu.push_word(cpu.bc());
+}
+
+fn ret(cpu: &mut Cpu) {
+ cpu.pc = cpu.pop_word();
+}
+
+fn call_u16(cpu: &mut Cpu) {
+ let word = cpu.read_u16();
+ cpu.push_word(cpu.pc);
+ cpu.pc = word;
+}
+
+fn ld_mff00u8_a(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.mmu.write(0xff00 + byte as u16, cpu.a);
+}
+
+fn ld_mff00c_a(cpu: &mut Cpu) {
+ cpu.mmu.write(0xff00 + cpu.c as u16, cpu.a);
+}
+
+fn ld_mu16_a(cpu: &mut Cpu) {
+ let word = cpu.read_u16();
+ cpu.mmu.write(word, cpu.a);
+}
+
+fn ld_a_mff00u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ cpu.a = cpu.mmu.read(0xff00 + byte as u16);
+}
+
+fn cp_a_u8(cpu: &mut Cpu) {
+ let byte = cpu.read_u8();
+ sub_set_flags(cpu, cpu.a, byte);
+}
+
+fn rl_c(cpu: &mut Cpu) {
+ cpu.c = rl(cpu, cpu.c);
+}
+
+fn bit_7_h(cpu: &mut Cpu) {
+ bit_h(cpu, 7);
+}
+
+/// Helper function that rotates (shifts) the given
+/// byte (probably from a register) and updates the
+/// proper flag registers.
+fn rl(cpu: &mut Cpu, byte: u8) -> u8 {
+ let carry = cpu.get_carry();
+
+ cpu.set_carry(byte & 0x80 == 0x80);
+
+ let result = (byte << 1) | carry as u8;
+
+ 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_h(cpu: &mut Cpu, bit: u8) {
+ cpu.set_sub(false);
+ cpu.set_zero(bit_zero(cpu.h, bit));
+ cpu.set_half_carry(true);
+}
+
+fn sub_set_flags(cpu: &mut Cpu, x: u8, y: u8) -> u8 {
+ // checks for borrow using 32bit arithmetics
+ let x = x as u32;
+ let y = y as u32;
+
+ let value = x.wrapping_sub(y);
+ let value_b = value as u8;
+
+ cpu.set_sub(true);
+ cpu.set_carry(value & 0x100 == 0x100);
+ cpu.set_zero(value_b == 0);
+ cpu.set_half_carry((x ^ y ^ value) & 0x10 == 0x10);
+
+ value_b
+}
+
+fn add_u16_u16(cpu: &mut Cpu, first: u16, second: u16) -> u16 {
+ let first = first as u32;
+ let second = second as u32;
+ let value = first.wrapping_add(second);
+
+ cpu.set_sub(false);
+ cpu.set_carry(value & 0x10000 == 0x10000);
+ cpu.set_half_carry((first ^ second ^ value) & 0x1000 == 0x1000);
+
+ value as u16
+}
diff --git a/src/lib.rs b/src/lib.rs
index a97946777148486e817e8da372732d215d1ca5dc..d585d8ecc1aa509dc3b0de7eba0cde276f1338b9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,6 @@
pub mod cpu;
pub mod gb;
+pub mod inst;
pub mod mmu;
pub mod ppu;
pub mod util;