Thomas Harte
7ef526e2d3
Fix destination decrement.
2022-05-19 15:22:59 -04:00
Thomas Harte
ce7f94559b
Add EXG, ABCD, SBCD.
2022-05-19 15:19:00 -04:00
Thomas Harte
0471decfc8
Implement the complete set of fetch addressing modes.
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Subject to observations: (1) MOVE uses slightly custom versions of many of these for its stores; and (2) PEA and LEA need to do the calculation but not the read, so some of this will be duplicated further. It's either that or include greater conditionality on the path.
2022-05-19 15:03:22 -04:00
Thomas Harte
e4c0a89889
Just use the four-bit register number directly.
2022-05-19 15:01:09 -04:00
Thomas Harte
084d6ca11d
Simplify address handling; add perform patterns for CMP, AND, OR, EOR.
2022-05-19 12:18:47 -04:00
Thomas Harte
274902c3c1
Add to-memory write-back. Am going to reconsider usage of temporary_address_ as noted.
2022-05-19 11:23:26 -04:00
Thomas Harte
f46e7c65c5
Add AddressRegisterIndirect fetches.
2022-05-19 10:47:57 -04:00
Thomas Harte
c6c6213460
Bifurcate the fetch-operand flow.
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Address calculation will be the same, but the fetch will differ. I don't think there's a neat costless way to factor out the address calculations, alas, but I'll see whether macros can save the day.
2022-05-19 10:27:51 -04:00
Thomas Harte
29f6b02c04
Factor out register setup/testing, generalising the DIVU/DIVS flag check.
2022-05-18 21:13:34 -04:00
Thomas Harte
1bf7c0ae5f
Attempt better to avoid entering a second instruction.
2022-05-18 21:00:34 -04:00
Thomas Harte
1b87626b82
Move some way towards MOVE.
2022-05-18 21:00:10 -04:00
Thomas Harte
44ae084794
Avoid the repeated .fill; reduces debug-build executor test time to 1.5s.
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i.e. eliminates about 95% of costs.
2022-05-18 17:10:23 -04:00
Thomas Harte
13a1809101
Avoid memset.
2022-05-18 17:00:35 -04:00
Thomas Harte
c35200fbd0
Shuffle mildly, primarily to avoid repeated 16mb allocations.
2022-05-18 16:59:37 -04:00
Thomas Harte
da9fb216b1
Remove setup_operation in favour of doing the equivalent inline.
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... as it'll probably allow me a route to `goto` straight out of there, too. At least, if I can find a sufficiently neat macro formulation.
2022-05-18 16:45:40 -04:00
Thomas Harte
bef12f3d65
Move ExecutionState into Implementation.hpp; use goto to avoid some double switches.
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Re: the latter, yuck. Yuck yuck yuck. But it does mean I can stop going back and forth on how to structure conditionality on effective address generation segueing into fetches without doubling up on tests.
2022-05-18 15:35:38 -04:00
Thomas Harte
aa9e7eb7a2
Codify MOVE's status somewhat, avoid reading write-only operands.
2022-05-17 16:57:33 -04:00
Thomas Harte
f3d3e588fd
Add enough of state to [sort-of] pass the first test.
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i.e. until the processor overruns, as it is permitted to do, and can't handle the second instruction.
2022-05-17 16:51:26 -04:00
Thomas Harte
4a40581deb
Completes performance of NBCD D0.
2022-05-17 16:10:20 -04:00
Thomas Harte
eed2672db5
Add documentation, honour signal_will_perform.
2022-05-17 15:05:11 -04:00
Thomas Harte
84071ac6d0
Implement reset logic, advance as far as actually performing an NBCD on D0 (but not writing it back).
2022-05-17 14:51:49 -04:00
Thomas Harte
1a27eea46c
Establish general pattern for selecting a performance phase and obtaining operands.
2022-05-17 14:08:50 -04:00
Thomas Harte
d0b6451f02
Step gingerly on to fetching operands.
2022-05-17 08:26:35 -04:00
Thomas Harte
2147c5a5f2
Fill in missing #undefs.
2022-05-16 21:02:25 -04:00
Thomas Harte
c7aa4d8b6d
Fix state transitions.
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Confirmed that the 68000 mk 2 now appears correctly to perform a reset.
2022-05-16 21:00:25 -04:00
Thomas Harte
e94efe887c
Switch to use of __COUNTER__.
2022-05-16 20:38:17 -04:00
Thomas Harte
3db2de7478
Works 68000 mk2 into the comparative tests.
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... revealing that I've leant a little too hard on __LINE__.
2022-05-16 20:04:13 -04:00
Thomas Harte
345f7c3c62
Fill in just enough to attempt the reset exception, assuming DTACK rather than VPA or BERR.
2022-05-16 16:57:40 -04:00
Thomas Harte
13848ddbbc
Add half-and-half access for SlicedInt32.
2022-05-16 16:56:54 -04:00
Thomas Harte
6f6e466c08
Make a first sketch of the coroutine-esque structure I'm going to experiment with here.
2022-05-16 11:59:03 -04:00
Thomas Harte
b0518040b5
Plants the seek of a 68000 mark 2.
2022-05-16 11:44:16 -04:00
Thomas Harte
29c872d867
Merge pull request #1032 from TomHarte/68000DIVUDIVS
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Generalises the 68000's DIVU and DIVS.
2022-05-15 20:33:22 -04:00
Thomas Harte
acb63a1307
Pull generalised DIVU/DIVS into a macro.
2022-05-15 20:01:51 -04:00
Thomas Harte
341bf2e480
Repattern DIVS after DIVU.
2022-05-15 16:54:58 -04:00
Thomas Harte
20a191f144
Switch to same tests, run through a more modern emulator.
2022-05-15 16:33:08 -04:00
Thomas Harte
81f4581f41
Merge pull request #1031 from TomHarte/BCDTests
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Correct 68000 BCD test results.
2022-05-15 07:24:30 -04:00
Thomas Harte
dfaf8ce64e
Merge pull request #1028 from TomHarte/68000Perform
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Add free function implementation of 68000 operations, and an instruction-set interpreter.
2022-05-15 07:21:03 -04:00
Thomas Harte
f60f1932f2
Restrict DIVU and DIVS tests to those which are well-defined.
2022-05-14 20:28:54 -04:00
Thomas Harte
ff8e4754d7
Ensure STOP exits the run loop.
2022-05-14 19:17:32 -04:00
Thomas Harte
27c4d19455
Support STOP.
2022-05-14 11:35:35 -04:00
Thomas Harte
7f704fdae1
Improve README.
2022-05-13 16:28:56 -04:00
Thomas Harte
dd63a6b61e
Correct all [A/S/N]BCD tests.
2022-05-13 16:18:58 -04:00
Thomas Harte
1935d968c5
Add ability to suggest solutions.
2022-05-13 15:27:11 -04:00
Thomas Harte
f83954f5b7
Switch to common bit-selection logic.
2022-05-13 15:08:15 -04:00
Thomas Harte
77b56c50e6
Ensure you can't trace into divide-by-zero, etc.
2022-05-13 14:02:56 -04:00
Thomas Harte
002a8c061f
Trim the public interface of Executor.
2022-05-13 13:55:37 -04:00
Thomas Harte
4299334e24
Clean up some TODOs, eliminate one further conditional.
2022-05-13 11:17:57 -04:00
Thomas Harte
4d03c73222
Ensure that the first instruction of privilege/line1010/etc exceptions isn't traced.
2022-05-13 11:08:22 -04:00
Thomas Harte
84cfbaa0a4
Remove manual test count, now that all are being performed.
2022-05-13 11:00:26 -04:00
Thomas Harte
7a2fd93d08
Document BusHandler interface.
2022-05-13 10:59:36 -04:00
