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405 Commits

Author SHA1 Message Date
Thomas Harte
b7fd4de32f Ensures a one-instruction latency on the trace flag. 2020-01-18 22:06:00 -05:00
Thomas Harte
9f2f547932 Adds and satisfies test on the function code word. 
Thanks to ijor's "68000 Address and Bus Error Stack Frame" re: contents.
 2020-01-04 23:58:07 -05:00
Thomas Harte
f0d5bbecf2 Introduces a test of stack contents after an address error. 
Fixes: stacked PC, address of fault.
 2020-01-04 23:22:07 -05:00
Thomas Harte
a28c52c250 Fixes A7-relative JSRs. 
I completely withdraw my earlier statement re: the test cases.
 2020-01-04 22:22:33 -05:00
Thomas Harte
7de1181213 Make a new guess at post-overflow DIV flags, based on tests. 
Specifically: for DIVU, stick with the current guess of a fixed set. For DIVS, leave N and Z alone.
 2020-01-03 23:44:49 -05:00
Thomas Harte
c7a5b054db There's no TODO here; overflow is always 0 for a 16x16 multiply. 
... and the original 68000 doesn't support 32x32 multiplies.
 2020-01-03 22:44:19 -05:00
Thomas Harte
2f8078db22 Switches to should_log as a global when I'm hacking about. 2020-01-02 20:15:48 -05:00
Thomas Harte
5be30b1f7b Introduces further comparative tests, prompting a new CHK fix. 
Specifically: how to set N when both is_under and is_over are true, and to eliminate a failure fully to prefetch in the longer addressing modes.
 2020-01-01 19:11:36 -05:00
Thomas Harte
b184426f2b Ensure that an interrupt from a STOP doesn't return to the STOP. 2020-01-01 14:51:47 -05:00
Thomas Harte
1de4f179c0 Adds more thorough comment on the bus program used. 2019-12-25 19:49:49 -05:00
Thomas Harte
3cb5684d95 Fixes RTR: the whole top half of the SR should be preserved. 
Specifically, the 68000 Reference Manual says: "The supervisor portion of the status register is unaffected." Clearly when I first read that I misread it as the supervisor _flag_ (rather than _portion_) should be preserved.
 2019-12-25 19:49:20 -05:00
Thomas Harte
274867579b Deploys constexpr as a stricter const. 2019-12-22 00:22:17 -05:00
Thomas Harte
cf16f41939 Makes value8_high/low and value16 branchless. 2019-12-21 20:58:37 -05:00
Thomas Harte
08f2877382 I think the 68000 actually loads a byte value onto both the upper and lower data lines. 2019-12-21 20:37:03 -05:00
Thomas Harte
a3e64cae41 Corrects SBCD carry. 2019-12-17 22:16:02 -05:00
Thomas Harte
8a2ac87209 Reverted SBCD/NBCD V behaviour. 2019-12-16 23:08:59 -05:00
Thomas Harte
096b447b4b Corrects MOVE -(An), SR/CCR, which was not previously decrementing. 
Also adds a safety check against other instances of the same error. There seem to be none.
 2019-12-16 22:38:54 -05:00
Thomas Harte
84167af54f Corrects CHK N flag. 2019-12-16 20:01:33 -05:00
Thomas Harte
8be26502c4 Fixes NBCD -(An)+, adds some additional comments. 2019-12-16 20:01:19 -05:00
Thomas Harte
4c068e9bb8 Corrects flags on CMPA.w. 2019-12-15 20:39:47 -05:00
Thomas Harte
dc1abd874e Corrects indentation typo. 2019-12-14 23:52:53 -05:00
Thomas Harte
4dd235f677 Adds supervisor/user to logged flags in trace mode. 2019-12-08 22:39:10 -05:00
Thomas Harte
407cc78c78 Extends to offer simpler 8-bit access handling. 2019-12-08 20:19:44 -05:00
Thomas Harte
b12136691a Corrects comment. 2019-11-18 23:46:33 -05:00
Thomas Harte
db03b03276 Corrects [AND/OR/EOR].bw Dn, -(An) to decrement destination. 
It was previously doing a predecrement on the internal source address, which is unused. This fixes at least Dan Dare III and Silkworm.
 2019-11-09 11:25:23 -05:00
Thomas Harte
6afefa107e Resolves unused variable warning. 2019-11-05 23:18:25 -05:00
Thomas Harte
07582cee4a BusGrant is a further signal I will need. 2019-11-03 21:10:42 -05:00
Thomas Harte
a67e0014a4 Fixes video base address and mono/colour monitor value. 
Now I see a GEM desktop. In blue.
 2019-11-02 19:36:15 -04:00
Thomas Harte
c070f2100c Attempts to regularise data bus access. 2019-11-01 23:01:06 -04:00
Thomas Harte
ecc0cea5a1 Added a potential branch for the newer TOS memory map. 2019-10-26 16:52:06 -04:00
Thomas Harte
6a80832140 Moves timing of interrupt sampling into prefetch queue advancement. 
As per comment, that is definitely the only place it can occur; I don't know whether it always occurs there.
 2019-08-04 21:06:34 -04:00
Thomas Harte
35b1a55c12 Corrects DIVS negative flag. 2019-08-04 20:36:33 -04:00
Thomas Harte
e3794c0c0e Takes a second pass at DIVS timing, seeming to correct that side of things. 2019-08-04 20:33:43 -04:00
Thomas Harte
478f2533b5 Corrects 68000 address bus during interrupt acknowledge. 
All unused bits should be 1, not 0.
 2019-08-03 15:38:36 -04:00
Thomas Harte
b7b62aa3f6 Resolves some type conversion warnings. 2019-07-26 23:20:40 -04:00
Thomas Harte
5769944918 Shrinks MicroOp struct size from 16 bytes to 4. 2019-07-25 10:14:36 -04:00
Thomas Harte
9ef1211d53 Adds missing header file. 2019-07-24 22:13:32 -04:00
Thomas Harte
f2ae04597f Updates test case. 2019-07-24 22:07:17 -04:00
Thomas Harte
1327de1c82 Slims the Program struct down to 8 bytes total. 2019-07-24 22:02:50 -04:00
Thomas Harte
827c4e172a Cuts a third from the Program struct. 
Observation: [source/destination]_address are always one of the address registers. So you can fit both within a single byte.

Net effect: around a 12% reduction in execution costs, given that this reduces the size of the instructions table from 3mb to 2mb.
 2019-07-24 18:39:36 -04:00
Thomas Harte
c300bd17fa Regularises as many source/destination sets as fit the current setter. 2019-07-24 18:22:44 -04:00
Thomas Harte
0187fd8eae Hides all runtime Program member accesses behind macros. 
... and fixes unit tests.
 2019-07-24 12:01:30 -04:00
Thomas Harte
4aca6c5ef8 Adds a note of admission here. 2019-07-23 23:03:15 -04:00
Thomas Harte
fa226bb1b9 Seeks to reduce enquiry costs. 2019-07-17 15:09:26 -04:00
Thomas Harte
cac97a9663 Devolves drive responsibility. 2019-07-10 22:39:56 -04:00
Thomas Harte
2ccb564a7b Throws some extra logging into place, to test the IWM changeover. 2019-07-10 21:39:45 -04:00
Thomas Harte
ed4ddcfda8 Reduces call/return overhead on Microcycle methods. 2019-07-09 19:55:30 -04:00
Thomas Harte
69b94719a1 Switches to faster bit count logic. 2019-07-09 18:41:20 -04:00
Thomas Harte
5078f6fb5c Marginally reduces MOVE heft. 2019-07-09 18:07:11 -04:00
Thomas Harte
94457d81b6 Eliminates redundant and integer-size-troubling AND on ASL. 2019-07-08 18:33:50 -04:00
Thomas Harte
fb352a8d40 Ensures assert is completely excluded if NDEBUG. 2019-07-08 18:00:37 -04:00
Thomas Harte
b9c2c42bc0 Switches drives to using floats for time counting. 
Hopefully to eliminate a lot of unnecessary `Time` work; inaccuracies should still be within tolerable range.
 2019-07-02 15:43:03 -04:00
Thomas Harte
c4cbe9476c Corrects EA selection logic, fixing MOVEP. 2019-07-02 13:54:21 -04:00
Thomas Harte
0a67cc3dab Goes nuclear on ROXL and ROXR. 2019-07-01 23:05:48 -04:00
Thomas Harte
726e07ed5b Corrects ASL overflow flag. 2019-07-01 19:46:58 -04:00
Thomas Harte
11d8f765b2 Corrects divide-by-zero exception length, enables all other DIVS checks. 2019-07-01 15:46:04 -04:00
Thomas Harte
514e57b3e9 Corrects DIVU timing and flags, improves DIVS. 2019-07-01 14:24:32 -04:00
Thomas Harte
d8fb6fb951 Corrects MULU timing. 2019-06-30 22:40:10 -04:00
Thomas Harte
255f0d4b2a Corrects MULS timing. 2019-06-30 22:33:54 -04:00
Thomas Harte
8d0cd356fd Corrects TRAP, TRAPV and CHK timing. 2019-06-29 21:25:22 -04:00
Thomas Harte
17666bc059 Corrects CHK flags. 2019-06-28 19:48:53 -04:00
Thomas Harte
241d29ff7c Imports SBCD and NBCD tests, and fixes corresponding operation. 2019-06-28 19:39:08 -04:00
Thomas Harte
c5039a4719 Imports ANDI, ORI and EORI to SR tests. 
Hence corrects supervisor/user privileges for SR/CCR.
 2019-06-28 15:05:46 -04:00
Thomas Harte
6c588a1510 Makes some further random swings at tracking the startup procedure. 2019-06-28 13:03:47 -04:00
Thomas Harte
d81053ea38 Invents some additional PEA tests, and further fixes PEA. 2019-06-27 17:59:03 -04:00
Thomas Harte
8d39c3bc98 Takes a shot at fixing PEA for A7-relative addresses. 
Unit tests required. Tomorrow.
 2019-06-26 23:24:54 -04:00
Thomas Harte
c0591090f5 Imports DIVU tests. 2019-06-26 22:25:48 -04:00
Thomas Harte
538aecb46e Imports CMP tests, and fixes CMP.l timing. 2019-06-26 22:02:04 -04:00
Thomas Harte
dbdbea85c2 Imports CMPA tests, and fixes CMPA.w. 2019-06-26 21:42:48 -04:00
Thomas Harte
ba2224dd06 Imports NEGX tests and thereby fixes NEGX's zero flag. 2019-06-26 19:39:04 -04:00
Thomas Harte
79066f8628 Imports NOT tests, fixes NOT overflow and carry flags. 2019-06-25 22:18:11 -04:00
Thomas Harte
2c813a2692 Imports CMPM tests and fixes CMPM.bw source/destination order. 2019-06-25 21:46:01 -04:00
Thomas Harte
d2cb595b83 Proactively attempts to fix CMPM PostInc addressing. 2019-06-25 21:24:03 -04:00
Thomas Harte
ecb5a0b8cc Incorporates ADDX tests and fixes ADDX PreDec. 2019-06-25 19:18:07 -04:00
Thomas Harte
e12e8fc616 Incorporates ASR tests, and fixes ASR (xxx).w. 
... which was re-injecting the wrong bit to preserve sign.
 2019-06-25 18:44:31 -04:00
Thomas Harte
1fbbf32cd2 Adds ASL tests, and corrects ASL (xxx).w. 
Overflow is wrong on other ASLs though, I think.
 2019-06-25 18:09:01 -04:00
Thomas Harte
31edb15369 Reduces 68000 startup costs a little further. 2019-06-25 17:41:13 -04:00
Thomas Harte
e830d23533 Incorporates TRAPV tests. 2019-06-24 21:21:35 -04:00
Thomas Harte
9a666fb8cc Imports NEG tests and fixes NEG.l Dn timing. 2019-06-24 19:43:30 -04:00
Thomas Harte
0e208ed432 Fixes cycle counting in the test machine. 2019-06-24 17:55:09 -04:00
Thomas Harte
c8b769de8a Completes import of LSL tests and fixes various LSL issues. 
Including LSL (xxx).w actually being LSR, and the carry flag generally being questionable.
 2019-06-24 17:45:38 -04:00
Thomas Harte
c447655047 Resolves assumption that shifts greater than the bit count of the relevant int are well-defined in C. 2019-06-24 16:51:43 -04:00
Thomas Harte
3ec9a1d869 Incorporates JMP tests, fixes JSR (xxx).l timing. 2019-06-24 15:36:33 -04:00
Thomas Harte
faef917cbd Improves resizeable microcycle test. 2019-06-24 10:55:22 -04:00
Thomas Harte
d27ba90c07 Attempts to introduce more rigour to variable-length instruction handling. 2019-06-24 10:43:28 -04:00
Thomas Harte
db4ca746e3 Introduces BSET tests, fixes BSET timing. 2019-06-23 22:53:37 -04:00
Thomas Harte
d50fbfb506 Imports EXG and PEA tests, and fixes EXG timing. 2019-06-23 22:21:25 -04:00
Thomas Harte
86fdc75feb Incorporates RTR test, adding a ProcessorState helper. 2019-06-23 18:37:32 -04:00
Thomas Harte
b63231523a Completes import of ROL tests. 2019-06-23 17:33:12 -04:00
Thomas Harte
70e296674d Starts import of ROL tests. 
Including time tests, this time.
 2019-06-22 22:42:57 -04:00
Thomas Harte
8c8493bc9d Ensures proper loading of the SP at reset. 2019-06-21 18:20:26 -04:00
Thomas Harte
ccfe1b13cb Imports DIVS, MULS and MOVE from SR tests. 
Not all passing.
 2019-06-21 16:03:11 -04:00
Thomas Harte
0c1c10bc66 Introduces a test that proves that DIVS' attempt to set proper timing isn't working. 2019-06-20 19:29:02 -04:00
Thomas Harte
fafd1801fe Introduces first DIVS test, and associated fixes. 2019-06-20 19:02:03 -04:00
Thomas Harte
79d8d27b4c Reintroduces use of locations_by_bus_step_ to decrease 68000 construction time. 2019-06-20 15:10:11 -04:00
Thomas Harte
440f52c943 Incorporates TRAP test. 2019-06-19 21:18:30 -04:00
Thomas Harte
91ced056d2 Adds tests for ADD. No failures. 2019-06-19 18:56:21 -04:00
Thomas Harte
8dace34e63 Imports third-party tests for ABCD, and thereby fixes ABCD. 2019-06-19 18:13:06 -04:00
Thomas Harte
8182b0363f Adds enum to help with status decoding. 2019-06-19 17:01:49 -04:00
Thomas Harte
c5b036fedf Ensures aborted decodes don't overwrite prior correct ones. 2019-06-19 17:00:44 -04:00