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614 Commits

Author SHA1 Message Date
Thomas Harte
f6ac407e4d Takes further steps towards supporting interrupts. 
Specifically:
* introduces the necessary bus signalling; and
* adds corresponding functional steps.

Still to figure out: getting into and out of an interrupt cycle.
 2019-05-01 15:19:24 -04:00
Thomas Harte
078c3135df The 5/3 split of microcycles appears not accurately to model when lines are tested. 
Therefore I've reverted to a more normative 4:4 form.
 2019-04-30 22:09:13 -04:00
Thomas Harte
92568c90c8 Adds support for HALT as an input, and puts some effort into how to calculate E. 2019-04-30 22:07:48 -04:00
Thomas Harte
f1879c5fbc Corrects interrupt level test within STOP. 2019-04-30 19:32:35 -04:00
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
3060175ff5 Eliminates constructions of std::tuple for performance reasons. 
Specifically: reduces 68000 construction time from 10+ seconds to more like 2.8.
 2019-04-29 22:43:15 -04:00
Thomas Harte
eb4233e2fd Joins some commonalities, shaving about 150 lines of code. 2019-04-29 22:37:23 -04:00
Thomas Harte
6b4c656849 Reverses order of instruction instantiation, reducing total bus step heft by about 11%. 
... since that means inserting more complicated instructions before simpler ones in general, making subset finds more likely.
 2019-04-29 22:20:18 -04:00
Thomas Harte
1b8fada6aa Restores accidentally-cropped functionality. 2019-04-29 22:10:00 -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
3da1b3bf9b Introduces storage for various bus inputs. 2019-04-29 19:22:05 -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
05d1eda422 Fixes crossed-over decoding of EORI and ORI. 2019-04-29 17:45:52 -04:00
Thomas Harte
31f318ad43 Fixes MOVE.bw #, (xxx).w. 2019-04-29 17:41:46 -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
97e118abfa Corrects accidental exclusion of MOVE.bw (xxx).w, [(xxx).w/(xxx).l]. 2019-04-28 23:25:46 -04:00
Thomas Harte
412f091d76 Implements a missing form of BTST. 2019-04-28 23:20:50 -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
e2abb66a11 Adds missing addressing modes for ADDA and SUBA. 
... reducing missing opcodes to 1941.
 2019-04-27 17:22:26 -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
796203859f Implements PEA. 
This decreases the unimplemented count by 28 from 11841 to 11813.
 2019-04-26 13:49:59 -04:00
Thomas Harte
40b2fe7339 Merge branch 'master' into 68000 2019-04-26 00:02:35 -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
3983f8303f Introduces failing test of 68000 opcode coverage. 2019-04-25 22:06:05 -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
4e25bcfcdc Corrects decoding of AND/OR x, Dn. 2019-04-25 14:19:13 -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
10f75acf71 Causes EXG to function. 2019-04-24 16:32:16 -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
75a7f7ab22 Inserts missing program fetch for CMPI.bw #, (d8/16...). 2019-04-24 14:45:24 -04:00
Thomas Harte
e214584c76 SWAP should clear overflow and carry. 2019-04-24 13:19:56 -04:00
Thomas Harte
0bb6b498ce Simplifies and fixes post-inc MOVE behaviour. 2019-04-24 13:14:25 -04:00
Thomas Harte
958d44a20d Causes SWAP actually to perform. 2019-04-24 13:06:12 -04:00
Thomas Harte
bb9424d944 Corrects byte increment/decrement actions for A7. 2019-04-24 13:01:08 -04:00
Thomas Harte
11bf706aa2 Attempts to fix LT and LTE conditions. 2019-04-24 10:07:17 -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
7c3ea7b2ea Resolves additional byte accesses being signalled as word. 2019-04-23 21:23:20 -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
55073b0a52 Corrects a bunch of MOVEs to (d8/16, PC/An, [Xn]). 2019-04-21 22:55:23 -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
b78ea7d24c Further simplifies CMPA. 2019-04-20 21:23:36 -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
Raphaël Zumer
71ac26944d Correct typos in Z80.hpp 2019-04-19 17:44:52 -04:00
Thomas Harte
2d97fc1f59 Beefs up documentation and developer support. 2019-04-19 13:29:35 -04:00
Thomas Harte
9ef7743205 Attempts to unify type decoding a little further. 2019-04-19 13:29:20 -04:00
Thomas Harte
ee7ae11e90 Implements EXG and SWAP. 2019-04-19 11:27:43 -04:00
Thomas Harte
f67d7f1db5 Adds the final (!) set of missing MOVEs. 2019-04-19 11:11:38 -04:00
Thomas Harte
99981751a2 Adds the official NOP. 
Which is a freebie.
 2019-04-18 23:46:01 -04:00
Thomas Harte
ffdf02c5df Adds MOVE XXX.lw, -(An) 2019-04-18 23:40:54 -04:00
Thomas Harte
27c7d00a05 Commutes final missing MOVEs to TODOs. 2019-04-18 23:35:32 -04:00
Thomas Harte
64c4137e5b Begins a cleanup procedure on MOVE. 2019-04-18 23:25:19 -04:00
Thomas Harte
8c26d0c6e6 Makes an attempt at RTE and RTR. 2019-04-18 20:50:58 -04:00
Thomas Harte
81dcfd9f85 Implements AND, OR and EOR. 
As well as introducing a little more nuance to the double-decoding test.
 2019-04-18 16:34:48 -04:00
Thomas Harte
9334557fbf Added important TODO. 2019-04-17 23:12:32 -04:00
Thomas Harte
b09de8efce Attempts to fill in the rest of MOVE x, -(An). 2019-04-17 23:05:16 -04:00
Thomas Harte
5a50eb56dd Marginally increases coverage of MOVE x, -(An). 2019-04-17 22:30:07 -04:00
Thomas Harte
e49b257e94 Takes a run at TRAP. 2019-04-17 22:21:56 -04:00
Thomas Harte
b8a0f4e831 Implements MOVE to/from USP. 2019-04-17 16:58:59 -04:00
Thomas Harte
29f8dcfb40 Fixes a bunch of (d16, An)-type MOVEs and implements MOVE (XXX).wl, (d16,An)/etc. 2019-04-17 16:13:35 -04:00
Thomas Harte
0c05983617 Shortens impact of MULU on the instruction stream to correct parsing. 
I need to look into this.
 2019-04-17 15:15:48 -04:00
Thomas Harte
0bd653708c Corrects MOVE.bw Dn, (An)[+]. 2019-04-17 14:31:20 -04:00
Thomas Harte
41d800cb63 Fixes ADD/SUB Dn,x to use the proper destination value. 2019-04-17 10:23:47 -04:00
Thomas Harte
cadc0bd509 Mental delusion lifted: JSR doesn't look enough like BSR. 2019-04-17 10:02:14 -04:00
Thomas Harte
b64da2710a Corrects a few MOVE #s. 2019-04-17 10:00:14 -04:00
Thomas Harte
82b08d0e3a Corrects addressing behaviour of nRd[+-]. 2019-04-17 08:53:34 -04:00
Thomas Harte
8f77d1831b Implements MULU and MULS. 2019-04-16 22:16:43 -04:00