diff options
Diffstat (limited to 'decoders/z80')
| -rw-r--r-- | decoders/z80/pd.py | 130 |
1 files changed, 59 insertions, 71 deletions
diff --git a/decoders/z80/pd.py b/decoders/z80/pd.py index 4663f95..d98df7c 100644 --- a/decoders/z80/pd.py +++ b/decoders/z80/pd.py @@ -33,21 +33,6 @@ class Pin: class Cycle: NONE, MEMRD, MEMWR, IORD, IOWR, FETCH, INTACK = range(7) -class OpState: - IDLE = 'IDLE' # no current instruction - PRE1 = 'PRE1' # first prefix - PRE2 = 'PRE2' # second prefix - PREDIS = 'PREDIS' # pre-opcode displacement - OPCODE = 'OPCODE' # opcode byte - POSTDIS = 'POSTDIS' # post-opcode displacement - IMM1 = 'IMM1' # first byte of immediate - IMM2 = 'IMM2' # second byte of immediate - ROP1 = 'ROP1' # first byte of read operand - ROP2 = 'ROP2' # second byte of read operand - WOP1 = 'WOP1' # first byte of write operand - WOP2 = 'WOP2' # second byte of write operand - RESTART = 'RESTART' # restart instruction decoding - # Provide custom format type 'H' for hexadecimal output # with leading decimal digit (assembler syntax). class AsmFormatter(string.Formatter): @@ -124,7 +109,7 @@ class Decoder(srd.Decoder): def __init__(self, **kwargs): self.prev_cycle = Cycle.NONE - self.op_state = OpState.IDLE + self.op_state = self.state_IDLE def start(self): self.out_ann = self.register(srd.OUTPUT_ANN) @@ -138,7 +123,7 @@ class Decoder(srd.Decoder): self.ann_data = None self.ann_dasm = None self.prev_cycle = Cycle.NONE - self.op_state = OpState.IDLE + self.op_state = self.state_IDLE self.instr_len = 0 def decode(self, ss, es, data): @@ -177,11 +162,11 @@ class Decoder(srd.Decoder): def on_cycle_end(self): self.instr_len += 1 - self.op_state = getattr(self, 'on_state_' + self.op_state)() + self.op_state = self.op_state() if self.ann_dasm is not None: self.put_disasm() - if self.op_state == OpState.RESTART: - self.op_state = self.on_state_IDLE() + if self.op_state == self.state_RESTART: + self.op_state = self.state_IDLE() if self.ann_data is not None: self.put_text(self.data_start, self.ann_data, @@ -208,9 +193,12 @@ class Decoder(srd.Decoder): def put_text(self, ss, ann_idx, ann_text): self.put(ss, self.samplenum, self.out_ann, [ann_idx, [ann_text]]) - def on_state_IDLE(self): + def state_RESTART(self): + return self.state_IDLE + + def state_IDLE(self): if self.prev_cycle != Cycle.FETCH: - return OpState.IDLE + return self.state_IDLE self.want_dis = 0 self.want_imm = 0 self.want_read = 0 @@ -230,132 +218,132 @@ class Decoder(srd.Decoder): self.op_prefix = 0 self.instr_len = 0 if self.bus_data in (0xCB, 0xED, 0xDD, 0xFD): - return OpState.PRE1 + return self.state_PRE1 else: - return OpState.OPCODE + return self.state_OPCODE - def on_state_PRE1(self): + def state_PRE1(self): if self.prev_cycle != Cycle.FETCH: self.mnemonic = 'Prefix not followed by fetch' self.ann_dasm = Ann.WARN - return OpState.RESTART + return self.state_RESTART self.op_prefix = self.pend_data if self.op_prefix in (0xDD, 0xFD): if self.bus_data == 0xCB: - return OpState.PRE2 + return self.state_PRE2 if self.bus_data in (0xDD, 0xED, 0xFD): - return OpState.PRE1 - return OpState.OPCODE + return self.state_PRE1 + return self.state_OPCODE - def on_state_PRE2(self): + def state_PRE2(self): if self.prev_cycle != Cycle.MEMRD: self.mnemonic = 'Missing displacement' self.ann_dasm = Ann.WARN - return OpState.RESTART + return self.state_RESTART self.op_prefix = (self.op_prefix << 8) | self.pend_data - return OpState.PREDIS + return self.state_PREDIS - def on_state_PREDIS(self): + def state_PREDIS(self): if self.prev_cycle != Cycle.MEMRD: self.mnemonic = 'Missing opcode' self.ann_dasm = Ann.WARN - return OpState.RESTART + return self.state_RESTART self.arg_dis = signed_byte(self.pend_data) - return OpState.OPCODE + return self.state_OPCODE - def on_state_OPCODE(self): + def state_OPCODE(self): (table, self.arg_reg) = instr_table_by_prefix[self.op_prefix] self.op_prefix = 0 instruction = table.get(self.pend_data, None) if instruction is None: self.mnemonic = 'Invalid instruction' self.ann_dasm = Ann.WARN - return OpState.RESTART + return self.state_RESTART (self.want_dis, self.want_imm, self.want_read, want_write, self.op_repeat, self.mnemonic) = instruction self.want_write = abs(want_write) self.want_wr_be = (want_write < 0) if self.want_dis > 0: - return OpState.POSTDIS + return self.state_POSTDIS if self.want_imm > 0: - return OpState.IMM1 + return self.state_IMM1 self.ann_dasm = Ann.INSTR if self.want_read > 0 and self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 + return self.state_ROP1 if self.want_write > 0 and self.prev_cycle in (Cycle.MEMWR, Cycle.IOWR): - return OpState.WOP1 - return OpState.RESTART + return self.state_WOP1 + return self.state_RESTART - def on_state_POSTDIS(self): + def state_POSTDIS(self): self.arg_dis = signed_byte(self.pend_data) if self.want_imm > 0: - return OpState.IMM1 + return self.state_IMM1 self.ann_dasm = Ann.INSTR if self.want_read > 0 and self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 + return self.state_ROP1 if self.want_write > 0 and self.prev_cycle in (Cycle.MEMWR, Cycle.IOWR): - return OpState.WOP1 - return OpState.RESTART + return self.state_WOP1 + return self.state_RESTART - def on_state_IMM1(self): + def state_IMM1(self): self.arg_imm = self.pend_data if self.want_imm > 1: - return OpState.IMM2 + return self.state_IMM2 self.ann_dasm = Ann.INSTR if self.want_read > 0 and self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 + return self.state_ROP1 if self.want_write > 0 and self.prev_cycle in (Cycle.MEMWR, Cycle.IOWR): - return OpState.WOP1 - return OpState.RESTART + return self.state_WOP1 + return self.state_RESTART - def on_state_IMM2(self): + def state_IMM2(self): self.arg_imm |= self.pend_data << 8 self.ann_dasm = Ann.INSTR if self.want_read > 0 and self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 + return self.state_ROP1 if self.want_write > 0 and self.prev_cycle in (Cycle.MEMWR, Cycle.IOWR): - return OpState.WOP1 - return OpState.RESTART + return self.state_WOP1 + return self.state_RESTART - def on_state_ROP1(self): + def state_ROP1(self): self.arg_read = self.pend_data if self.want_read < 2: self.mnemonic = '{ro:02X}' self.ann_dasm = Ann.ROP if self.want_write > 0: - return OpState.WOP1 + return self.state_WOP1 if self.want_read > 1: - return OpState.ROP2 + return self.state_ROP2 if self.op_repeat and self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 - return OpState.RESTART + return self.state_ROP1 + return self.state_RESTART - def on_state_ROP2(self): + def state_ROP2(self): self.arg_read |= self.pend_data << 8 self.mnemonic = '{ro:04X}' self.ann_dasm = Ann.ROP if self.want_write > 0 and self.prev_cycle in (Cycle.MEMWR, Cycle.IOWR): - return OpState.WOP1 - return OpState.RESTART + return self.state_WOP1 + return self.state_RESTART - def on_state_WOP1(self): + def state_WOP1(self): self.arg_write = self.pend_data if self.want_read > 1: - return OpState.ROP2 + return self.state_ROP2 if self.want_write > 1: - return OpState.WOP2 + return self.state_WOP2 self.mnemonic = '{wo:02X}' self.ann_dasm = Ann.WOP if self.want_read > 0 and self.op_repeat and \ self.prev_cycle in (Cycle.MEMRD, Cycle.IORD): - return OpState.ROP1 - return OpState.RESTART + return self.state_ROP1 + return self.state_RESTART - def on_state_WOP2(self): + def state_WOP2(self): if self.want_wr_be: self.arg_write = (self.arg_write << 8) | self.pend_data else: self.arg_write |= self.pend_data << 8 self.mnemonic = '{wo:04X}' self.ann_dasm = Ann.WOP - return OpState.RESTART + return self.state_RESTART |