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Implement more JP instructions

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This commit is contained in:
Franco Colmenarez 2021-10-18 18:46:17 -05:00
parent eeeba76ebd
commit b964992f8a
1 changed files with 40 additions and 0 deletions
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40
src/cpu.rs
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@ -695,8 +695,22 @@ impl CPU {
}
},
// Jump to address
//
Opcode::JP(params) => match params {
OpcodeParameter::U16(address) => self.registers.set(Register::PC, address),
OpcodeParameter::Register(register) => self.registers.set(Register::PC, self.registers.get(register)),
OpcodeParameter::FlagRegisterReset_U16(flag, addr) => {
self.registers.increment(Register::PC, 3);
if !self.registers.get_flag(flag) {
self.registers.set(Register::PC, addr);
}
},
OpcodeParameter::FlagRegisterSet_U16(flag, addr) => {
self.registers.increment(Register::PC, 3);
if self.registers.get_flag(flag) {
self.registers.set(Register::PC, addr);
}
},
_ => {},
},
// CALL
@ -1685,6 +1699,32 @@ mod tests {
let mut bus = Bus::new();
cpu.exec(Opcode::JP(OpcodeParameter::U16(0x1F1F)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), 0x1F1F);
let mut cpu = CPU::new();
let addr = 0xC000;
cpu.registers.set(Register::HL, addr);
cpu.exec(Opcode::JP(OpcodeParameter::Register(Register::HL)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), addr);
let mut cpu = CPU::new();
cpu.registers.set_flag(FlagRegister::Zero, false);
cpu.exec(Opcode::JP(OpcodeParameter::FlagRegisterReset_U16(FlagRegister::Zero, addr)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), addr);
let mut cpu = CPU::new();
cpu.registers.set_flag(FlagRegister::Zero, true);
cpu.exec(Opcode::JP(OpcodeParameter::FlagRegisterSet_U16(FlagRegister::Zero, addr)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), addr);
let mut cpu = CPU::new();
cpu.registers.set_flag(FlagRegister::Zero, true);
cpu.exec(Opcode::JP(OpcodeParameter::FlagRegisterReset_U16(FlagRegister::Zero, addr)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), 0x103);
let mut cpu = CPU::new();
cpu.registers.set_flag(FlagRegister::Zero, false);
cpu.exec(Opcode::JP(OpcodeParameter::FlagRegisterSet_U16(FlagRegister::Zero, addr)), &mut bus);
assert_eq!(cpu.registers.get(Register::PC), 0x103);
}
#[test]