marcothms/hm-asm
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fix PC calculation

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This commit is contained in:
Henrik Böving
2020-11-30 17:08:00 +01:00
parent abe5b3a45f
commit 9d650b1f7c
1 changed files with 19 additions and 14 deletions
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31
src/simulate.rs
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@@ -63,7 +63,7 @@ pub fn simulate<'a>(instructions: Vec<Instruction<'a>>, max_steps: usize) -> Vec
let mut states: Vec<State> = Vec::new();
let mut step: usize = 0;
let mut clk: bool;
let mut pc: u8;
let mut pc: u8 = 0;
let mut addr_bus: u8;
let mut data_bus: u8;
let mut ir : u8 = 0;
@@ -87,7 +87,7 @@ pub fn simulate<'a>(instructions: Vec<Instruction<'a>>, max_steps: usize) -> Vec
}
}
let mut next_pc = 0;
let mut next_pc: Option<u8> = None;
let mut next_akku = 0;
let mut next_carry = false;
let mut next_data_mem_addr: Option<usize> = None;
@@ -97,11 +97,16 @@ pub fn simulate<'a>(instructions: Vec<Instruction<'a>>, max_steps: usize) -> Vec
next_carry = (next_akku & (1<<4)) != 0;
}
next_pc = next_pc % 16;
if let Some(mut next_pc_value) = next_pc {
next_pc_value = next_pc_value % 16;
next_akku = next_akku % 16;
pc = next_pc_value;
next_pc = None;
}
pc = next_pc;
akku = next_akku;
if let Some(addr) = next_data_mem_addr {
data_memory[addr] = next_data_mem_val.unwrap();
next_data_mem_addr = None;
@@ -186,19 +191,19 @@ pub fn simulate<'a>(instructions: Vec<Instruction<'a>>, max_steps: usize) -> Vec
NoArgumentInstruction::NOP => {}
},
Instruction::ConstantArgumentInstruction(instruction, _) => match instruction {
ConstantArgumentInstruction::BRC(arg) if sr.carry => next_pc = pc + arg,
ConstantArgumentInstruction::BRN(arg) if sr.negative => next_pc = pc + arg,
ConstantArgumentInstruction::BRZ(arg) if sr.zero => next_pc = pc + arg,
ConstantArgumentInstruction::BRC(arg) if sr.carry => next_pc = Some(pc + arg),
ConstantArgumentInstruction::BRN(arg) if sr.negative => next_pc = Some(pc + arg),
ConstantArgumentInstruction::BRZ(arg) if sr.zero => next_pc = Some(pc + arg),
_ => {}
},
Instruction::Jump(arg, _) => match arg {
JumpArgument::Label(label) => {
next_pc = *labels.get(label).unwrap();
addr_bus = next_pc;
next_pc = Some(*labels.get(label).unwrap());
addr_bus = *labels.get(label).unwrap();
},
JumpArgument::Location(location) => {
next_pc = location;
addr_bus = next_pc;
next_pc = Some(location);
addr_bus = location;
},
},
Instruction::MemoryLocationInstruction(arg, _) => match arg {
@@ -225,8 +230,8 @@ pub fn simulate<'a>(instructions: Vec<Instruction<'a>>, max_steps: usize) -> Vec
data_bus = data_memory[addr_bus as usize];
if next_pc == pc {
next_pc = pc + 1;
if let None = next_pc {
next_pc = Some(pc + 1);
}
states.push(State{