Thomas Harte
31bb770fdd
Implement STOPpages, waits for DTack, and bus and address error exceptions.
2019-04-30 19:24:22 -04:00
Thomas Harte
e430f2658f
Adds a test and by that means fixes divide-by-zero exception return addresses.
2019-04-29 23:09:50 -04:00
Thomas Harte
977f9ee831
Takes a run at divide-by-zero exceptions and starts looking towards ways to improve startup time.
2019-04-29 22:08:16 -04:00
Thomas Harte
16fb3b49a5
It leads to a TODO, but implemented decoding and initial setup of STOPpages.
2019-04-29 19:30:00 -04:00
Thomas Harte
bc00856c05
Removed TODO; it appears this is just the standard stack frame.
2019-04-29 19:09:20 -04:00
Thomas Harte
52e3dece81
Improves exposition.
2019-04-29 19:07:14 -04:00
Thomas Harte
2c1d8fa18a
Adds a check for instruction privilege violation, albeit that I think I need different bus steps.
2019-04-29 19:06:10 -04:00
Thomas Harte
3e34ae67f6
Implements support for the trace flag.
2019-04-29 19:02:59 -04:00
Thomas Harte
ceebecec8d
Corrects zero and negative flags for EXT.w.
2019-04-29 17:54:33 -04:00
Thomas Harte
270f46e147
Normalises CMPl.
2019-04-29 17:27:56 -04:00
Thomas Harte
8564945713
Corrects vector nomination for unrecognised opcodes.
2019-04-29 17:10:33 -04:00
Thomas Harte
7bd7f3fb73
Sign-extends (xxx).w addresses.
2019-04-29 16:55:43 -04:00
Thomas Harte
c466b6f9e7
Factors out the [unit testing] stuff of being a trace-checking 68000 bus handler.
2019-04-29 16:11:01 -04:00
Thomas Harte
d9071ee9f1
Starts sketching out the asynchronous bus.
2019-04-29 13:45:53 -04:00
Thomas Harte
ca1f669e64
Implements MOVEP.
...
371 is now the alleged number of missing opcodes. But I'd dare imagine it's more like three or four.
2019-04-28 22:52:54 -04:00
Thomas Harte
0298b1b3b7
Implements LINK and UNLINK.
...
Also starts excluding opcodes that I can't determine the mapping of from the list of those tested against.
Due to those two things together, the latter incomplete: 627 opcodes outstanding. But only STOP and MOVEP remain on my list of things to implement prior to exceptions.
2019-04-28 17:12:31 -04:00
Thomas Harte
4b1324de77
Takes a run at TRAPV.
...
... to leave 1466 as the unimplemented count.
2019-04-28 15:52:58 -04:00
Thomas Harte
8e8dce9bec
Attempts an implementation of CHK.
...
1467 is now the official count of things to implement, though I'm starting to get suspicious.
2019-04-28 15:47:21 -04:00
Thomas Harte
f4350522bf
Implements NBCD.
...
Now outstanding: 1891.
2019-04-27 21:29:50 -04:00
Thomas Harte
ab5fcab9bf
Attempts an implementation of ADDX and SUBX.
...
Leaving 2005 non-[A/F]-line instructions.
2019-04-27 16:57:47 -04:00
Thomas Harte
e75b386f7d
Attempts DIVU and DIVS.
...
Reportedly leaving 10965 operations now unimplemented.
2019-04-26 22:22:35 -04:00
Thomas Harte
a3b6d2d16e
Corrects test and resolves all instances of opcodes that are valid but shouldn't be.
...
The converse case will require implementation of the remaining instructions.
2019-04-25 22:54:58 -04:00
Thomas Harte
dab9bb6575
Implements EXT.
2019-04-25 18:22:19 -04:00
Thomas Harte
c132bda01c
Implements MOVE from SR.
2019-04-25 14:39:32 -04:00
Thomas Harte
ea463549c7
Corrects overflow flag for LSL and LSR.
2019-04-25 13:59:10 -04:00
Thomas Harte
723acb31b3
Corrects various flag issues with ADD, SUB and NEG.
2019-04-25 13:53:23 -04:00
Thomas Harte
5725db9234
Corrects calculated-address TAS.
2019-04-25 12:42:05 -04:00
Thomas Harte
8557e563bc
Takes a run at TAS, clarifying bus cycles.
2019-04-25 12:19:40 -04:00
Thomas Harte
d2491633ce
Ensures MOVEM to M .w correctly updates A7.
2019-04-24 23:21:15 -04:00
Thomas Harte
002796e5f5
Takes a run at BSET and BCHG.
2019-04-24 23:01:32 -04:00
Thomas Harte
fa0accf251
Attempts to correct flags for ASL, ASR, LSL, LSR.
2019-04-24 21:04:47 -04:00
Thomas Harte
dcb8176d90
Corrects potential failure properly to set stack pointer state.
2019-04-24 17:58:27 -04:00
Thomas Harte
be32b1a198
Fixes JSR (An) return address [again].
2019-04-24 17:50:38 -04:00
Thomas Harte
582e4acc11
Implements ANDI/ORI/EOR to SR/CCR.
2019-04-24 17:38:59 -04:00
Thomas Harte
b9933f512f
Fixed: the word/long-word bit works the other way around.
2019-04-24 16:30:15 -04:00
Thomas Harte
e214584c76
SWAP should clear overflow and carry.
2019-04-24 13:19:56 -04:00
Thomas Harte
033b8e6b36
ADD/SUBQ #, An shouldn't set flags.
...
Also, temporarily at least, adds a new means for observing CPU behaviour.
2019-04-24 09:59:54 -04:00
Thomas Harte
a08043ae88
Ensures that MOVE.b #, (xxx).l writes only a byte.
...
Also rearranges some of the temporary logging functionality.
2019-04-23 19:01:58 -04:00
Thomas Harte
7c132a3ed5
Ensures 16-bit values of Xn for (d8, An, Xn) are sign extended.
2019-04-22 22:13:02 -04:00
Thomas Harte
20e774be1e
Corrects return address of JSR (An).
2019-04-22 21:11:49 -04:00
Thomas Harte
6d6046757d
Fixes predecrementing MOVEM to leave the proper address in the relevant register.
2019-04-22 15:41:09 -04:00
Thomas Harte
44eb4e51ed
Ensures DBcc properly signals program fetches.
2019-04-21 22:54:20 -04:00
Thomas Harte
3cb042a49d
Corrects the carry and extend flags for various long-word operations.
2019-04-21 22:08:18 -04:00
Thomas Harte
c66728dce2
Corrects decoding of CMPA.
2019-04-20 21:21:33 -04:00
Thomas Harte
0be9a0cb88
Corrects Scc (and other conditionals) for complex addressing modes.
2019-04-20 18:35:19 -04:00
Thomas Harte
a90f12dab7
Corrects return address for TRAP.
2019-04-20 15:49:32 -04:00
Thomas Harte
ef33b004f9
Corrects word access order of MOVEM.l.
2019-04-20 15:13:12 -04:00
Thomas Harte
2cac4b0d74
Corrects EA usage for ADDA and SUBA.
2019-04-19 23:02:41 -04:00
Thomas Harte
a49f516265
Corrects direction of MOVE [to/from] USP.
2019-04-19 22:41:06 -04:00
Thomas Harte
ee7ae11e90
Implements EXG and SWAP.
2019-04-19 11:27:43 -04:00
