zzkt/orao
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

feat: show execution trace on invalid opcode

Browse source
This commit is contained in:
shokre 2021-11-20 14:56:14 +01:00
parent 4f40aaa7b2
commit 33c957630e
1 changed files with 12 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
orao/cpu.py
View file

@ -12,6 +12,7 @@ class CPU(object):
s, self.tape_out, self.filename, self.samples = self, None, None, 0 s, self.tape_out, self.filename, self.samples = self, None, None, 0
s.memory, s.tape, s.flipflop, s.last_sound_cycles, s.sndbuf = memory, None, 0, -20000, [] s.memory, s.tape, s.flipflop, s.last_sound_cycles, s.sndbuf = memory, None, 0, -20000, []
s.cycles, s.pc, s.flags, s.sp, s.a, s.x, s.y = 0, 0xFF89, 48, 0xFF, 0, 0, 0 s.cycles, s.pc, s.flags, s.sp, s.a, s.x, s.y = 0, 0xFF89, 48, 0xFF, 0, 0, 0
s.executed = []
s._opcodes = { 0x00:(s.BRK,s.no,7), 0x01:(s.ORA,s.ix,6), 0x05:(s.ORA,s.zp,3), s._opcodes = { 0x00:(s.BRK,s.no,7), 0x01:(s.ORA,s.ix,6), 0x05:(s.ORA,s.zp,3),
0x06:(s.ASL,s.zp,5), 0x08:(s.PHP,s.no,3), 0x09:(s.ORA,s.im,2), 0x0a:(s.ASL,s.no,2), 0x06:(s.ASL,s.zp,5), 0x08:(s.PHP,s.no,3), 0x09:(s.ORA,s.im,2), 0x0a:(s.ASL,s.no,2),
@ -270,10 +271,21 @@ class CPU(object):
def BVC(self, addr): self.BRANCH(addr, self.OVERFLOW, False) def BVC(self, addr): self.BRANCH(addr, self.OVERFLOW, False)
def step(self): def step(self):
self.executed.append(self.pc)
opcode = self.memory[self.pc] opcode = self.memory[self.pc]
self.pc = self.pc + 1 & 0xFFFF self.pc = self.pc + 1 & 0xFFFF
if opcode not in self._opcodes:
print('HALT')
for adr in self.executed:
print(" - %04x" % adr)
instruction, addressing, cycles = self._opcodes[opcode] instruction, addressing, cycles = self._opcodes[opcode]
instruction(addressing()) instruction(addressing())
self.pc += self.ticks[addressing] self.pc += self.ticks[addressing]
if len(self.executed) > 20:
self.executed = self.executed[1:]
self.cycles += cycles self.cycles += cycles