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feat: show dissasembly when CPU halts

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This commit is contained in:
shokre 2021-11-25 02:30:26 +01:00
parent 517e3d821c
commit f6dd24732e
1 changed files with 23 additions and 2 deletions
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25
orao/cpu.py
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@ -57,6 +57,21 @@ class CPU(object):
s.ticks = {s.im: 1, s.zp: 1, s.zx: 1, s.zy: 1, s.ab: 2, s.ax: 2, s.no: 0,
s.ay: 2, s.jm: 2, s.id: 2, s.ix: 1, s.iy: 1, s.re: 1}
s.addr_fmt = {
s.im: lambda addr: "#$%02X" % s.memory[addr],
s.zp: lambda addr: "$%02X" % s.memory[addr],
s.zx: lambda addr: "$%02X,x" % s.memory[addr],
s.zy: lambda addr: "$%02X,y" % s.memory[addr],
s.ab: lambda addr: "$%04X" % (256 * s.memory[addr + 1] + s.memory[addr]),
s.ax: lambda addr: "$%04X,x" % (256 * s.memory[addr + 1] + s.memory[addr]),
s.no: lambda addr: "",
s.jm: lambda addr: "$%04X" % (256 * s.memory[addr + 1] + s.memory[addr]),
s.id: lambda addr: "($%04X)" % (256 * s.memory[addr + 1] + s.memory[addr]),
s.ix: lambda addr: "($%02X,x)" % s.memory[addr],
s.iy: lambda addr: "($%02X),y" % s.memory[addr],
s.re: lambda addr: "$%04X" % (addr + s.memory[addr] + 1),
}
def get_flag(self, flag): return self.flags & flag != 0
def set_flag(self, flag, boolean):
@ -277,6 +292,11 @@ class CPU(object):
def BVS(self, addr): self.BRANCH(addr, self.OVERFLOW, True)
def BVC(self, addr): self.BRANCH(addr, self.OVERFLOW, False)
# dissasemble address
def disasm(self, addr):
instruction, addressing, cycles = self._opcodes[self.memory[addr]]
return "%04X %s %s" % (addr, instruction.__name__.lower(), self.addr_fmt[addressing](addr+1)), addr + self.ticks[addressing] + 1
def step(self):
self.executed.append(self.pc)
@ -285,8 +305,9 @@ class CPU(object):
if opcode not in self._opcodes:
print('HALT')
for adr in self.executed:
print(" - %04x" % adr)
for addr in self.executed:
code, _ = self.disasm(addr)
print(" - %s" % code)
instruction, addressing, cycles = self._opcodes[opcode]
instruction(addressing())