diff options
| author | Hannes Schulze <haschu0103@outlook.de> | 2025-01-18 00:05:53 +0100 |
|---|---|---|
| committer | Hannes Schulze <haschu0103@outlook.de> | 2025-01-18 00:05:53 +0100 |
| commit | d5a52cc491a222f1b7d33fa6789bed617ec6638b (patch) | |
| tree | a1c849e94620eb2c132fbd1a61898ef51ce167ba /src/nes/cpu.cc | |
| parent | 9d80b5b8a61bd8c2336f5032de8b84fea15d685f (diff) | |
cpu: bugfixes
Diffstat (limited to 'src/nes/cpu.cc')
| -rw-r--r-- | src/nes/cpu.cc | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/src/nes/cpu.cc b/src/nes/cpu.cc index 277c05d..2a079cc 100644 --- a/src/nes/cpu.cc +++ b/src/nes/cpu.cc @@ -14,6 +14,25 @@ namespace nes registers_.pc = read16(address{ 0xFFFC }); } + auto cpu::snapshot(test::status& snapshot) -> void + { + snapshot.cpu_cycle = current_cycles_; + snapshot.ram = std::vector(std::begin(ram_), std::end(ram_)); + snapshot.registers.pc = registers_.pc; + snapshot.registers.sp = registers_.sp; + snapshot.registers.a = registers_.a; + snapshot.registers.x = registers_.x; + snapshot.registers.y = registers_.y; + snapshot.registers.p = registers_.p; + snapshot.registers.c = registers_.c; + snapshot.registers.z = registers_.z; + snapshot.registers.i = registers_.i; + snapshot.registers.d = registers_.d; + snapshot.registers.b = registers_.b; + snapshot.registers.v = registers_.v; + snapshot.registers.n = registers_.n; + } + auto cpu::step_to(cycle_count const target) -> void { while (current_cycles_ < target) @@ -71,7 +90,7 @@ namespace nes case 0x27: run_rla<addressing_mode::zero_page>(); break; case 0x28: run_plp(); break; case 0x29: run_and<addressing_mode::immediate>(); break; - case 0x2A: run_rol<addressing_mode::absolute>(); break; + case 0x2A: run_rol<addressing_mode::accumulator>(); break; case 0x2B: run_anc<addressing_mode::immediate>(); break; case 0x2C: run_bit<addressing_mode::absolute>(); break; case 0x2D: run_and<addressing_mode::absolute>(); break; @@ -352,7 +371,7 @@ namespace nes { // ASL: Arithmetic Shift Left auto operand = fetch_operand<Mode>(); - eval_asl(operand.read()); + operand.write(eval_asl(operand.read())); current_cycles_ += shift_cycle_count<Mode>(); } @@ -613,7 +632,7 @@ namespace nes template<cpu::addressing_mode Mode> auto cpu::run_ahx() -> void { - // AHX: AND A X H + // AHX: ??? // TODO std::abort(); } @@ -694,7 +713,7 @@ namespace nes template<cpu::addressing_mode Mode> auto cpu::run_tas() -> void { - // TAS: S = A & X + AND S H + // TAS: ??? // TODO std::abort(); } @@ -702,7 +721,7 @@ namespace nes template<cpu::addressing_mode Mode> auto cpu::run_shy() -> void { - // SHY: AND Y H + // SHY: ??? // TODO std::abort(); } @@ -710,7 +729,7 @@ namespace nes template<cpu::addressing_mode Mode> auto cpu::run_shx() -> void { - // SHY: AND X H + // SHY: ??? // TODO std::abort(); } @@ -796,7 +815,7 @@ namespace nes template<cpu::addressing_mode Mode> auto cpu::run_las() -> void { - // LAS: AND S, store into A, X, S + // LAS: ??? // TODO std::abort(); } @@ -1055,7 +1074,7 @@ namespace nes registers_.a = new_val; registers_.c = tmp > 0xFF; - registers_.v = ((old_val ^ arg) & 0x80) == 0 && ((old_val ^ new_val) & 0x80) == 0; + registers_.v = ((old_val ^ arg) & 0x80) == 0 && ((old_val ^ new_val) & 0x80) != 0; update_alu_flags(registers_.a); } |