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more CALL instructions

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This commit is contained in:
Franco Colmenarez 2021-10-17 13:12:04 -05:00
parent 31e0b2c79c
commit a8f00f46fd
1 changed files with 57 additions and 5 deletions
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60
src/cpu.rs
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@ -537,16 +537,30 @@ impl CPU {
// CALL
Opcode::CALL(params) => {
self.registers.increment(Register::PC, 3);
let mut condition_met = false;
let mut addr = self.registers.get(Register::PC);
match params {
OpcodeParameter::U16(address) => {
condition_met = true;
addr = address;
},
OpcodeParameter::FlagRegisterReset_U16(flag, address) => {
condition_met = !self.registers.get_flag(flag);
addr = address;
},
OpcodeParameter::FlagRegisterSet_U16(flag, address) => {
condition_met = self.registers.get_flag(flag);
addr = address;
},
_ => {},
};
if condition_met {
let pc = self.registers.get(Register::PC);
self.registers.decrement(Register::SP, 2);
let sp = self.registers.get(Register::SP);
bus.write_16bit(sp, pc);
self.registers.set(Register::PC, address);
},
_ => {},
};
self.registers.set(Register::PC, addr);
}
},
// RST, same as Call
Opcode::RST(address) => self.exec(Opcode::CALL(OpcodeParameter::U16(address as u16)), bus),
@ -1111,6 +1125,44 @@ mod tests {
assert_eq!(cpu.registers.get(Register::SP), sp - 2);
assert_eq!(cpu.registers.get(Register::PC), 0xF0F0);
let mut cpu = CPU::new();
let sp = 0xFFDF;
cpu.registers.set(Register::SP, sp);
cpu.registers.set_flag(FlagRegister::Zero, false);
cpu.registers.set(Register::PC, 0x1234);
cpu.exec(Opcode::CALL(OpcodeParameter::FlagRegisterReset_U16(FlagRegister::Zero, 0xF0F0)), &mut bus);
assert_eq!(bus.read_16bit(sp - 2), 0x1234 + 3);
assert_eq!(cpu.registers.get(Register::SP), sp - 2);
assert_eq!(cpu.registers.get(Register::PC), 0xF0F0);
let mut cpu = CPU::new();
let sp = 0xFFDF;
cpu.registers.set(Register::SP, sp);
cpu.registers.set_flag(FlagRegister::Zero, true);
cpu.exec(Opcode::CALL(OpcodeParameter::FlagRegisterReset_U16(FlagRegister::Zero, 0xF0F0)), &mut bus);
// assert_eq!(bus.read_16bit(sp - 2), 0x1234 + 3);
assert_eq!(cpu.registers.get(Register::SP), sp);
assert_eq!(cpu.registers.get(Register::PC), 0x103);
let mut cpu = CPU::new();
let sp = 0xFFDF;
cpu.registers.set(Register::SP, sp);
cpu.registers.set_flag(FlagRegister::Zero, true);
cpu.registers.set(Register::PC, 0x1234);
cpu.exec(Opcode::CALL(OpcodeParameter::FlagRegisterSet_U16(FlagRegister::Zero, 0xF0F0)), &mut bus);
assert_eq!(bus.read_16bit(sp - 2), 0x1234 + 3);
assert_eq!(cpu.registers.get(Register::SP), sp - 2);
assert_eq!(cpu.registers.get(Register::PC), 0xF0F0);
let mut cpu = CPU::new();
let sp = 0xFFDF;
cpu.registers.set(Register::SP, sp);
cpu.registers.set_flag(FlagRegister::Zero, false);
cpu.exec(Opcode::CALL(OpcodeParameter::FlagRegisterSet_U16(FlagRegister::Zero, 0xF0F0)), &mut bus);
// assert_eq!(bus.read_16bit(sp - 2), 0x1234 + 3);
assert_eq!(cpu.registers.get(Register::SP), sp);
assert_eq!(cpu.registers.get(Register::PC), 0x103);
// RST
let mut cpu = CPU::new();
let sp = 0xFFDF;