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Implement JMP instruction.

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This commit is contained in:
Andrew Keeton 2014-10-19 21:37:43 -04:00
parent 6d7388c779
commit 1c1353127a
1 changed files with 21 additions and 4 deletions
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21
src/machine.rs
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@ -29,7 +29,7 @@ use log;
use std; use std;
use address::{AddressDiff}; use address::{Address, AddressDiff};
use instruction; use instruction;
use instruction::{DecodedInstr}; use instruction::{DecodedInstr};
use memory::Memory; use memory::Memory;
@ -92,7 +92,11 @@ impl Machine {
(instruction::DEX, instruction::UseImplied) => { (instruction::DEX, instruction::UseImplied) => {
self.dec_x(); self.dec_x();
} },
(instruction::JMP, instruction::UseAddress(addr)) => {
self.jump(addr)
},
(instruction::LDA, instruction::UseImmediate(val)) => { (instruction::LDA, instruction::UseImmediate(val)) => {
log!(log::DEBUG, "load A immediate: {}", val); log!(log::DEBUG, "load A immediate: {}", val);
@ -208,6 +212,10 @@ impl Machine {
let val = self.registers.index_x; let val = self.registers.index_x;
self.load_x_register(val - 1); self.load_x_register(val - 1);
} }
pub fn jump(&mut self, addr: Address) {
self.registers.program_counter = addr;
}
} }
impl std::fmt::Show for Machine { impl std::fmt::Show for Machine {
@ -335,3 +343,12 @@ fn dec_x_test() {
assert_eq!(machine.registers.status.contains(PS_NEGATIVE), true); assert_eq!(machine.registers.status.contains(PS_NEGATIVE), true);
assert_eq!(machine.registers.status.contains(PS_OVERFLOW), false); assert_eq!(machine.registers.status.contains(PS_OVERFLOW), false);
} }
#[test]
fn jump_test() {
let mut machine = Machine::new();
let addr = Address(0xA1B1);
machine.jump(addr);
assert_eq!(machine.registers.program_counter, addr);
}