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
Thomas Harte
0d81992f6a
Move object creation.
2022-05-13 10:50:16 -04:00
Thomas Harte
5b67c9bf4a
MOVE to SR requires supervisor privileges.
2022-05-13 09:01:03 -04:00
Thomas Harte
6594b38567
Tidy up, and reduce for now to a summary report.
2022-05-13 08:02:20 -04:00
Thomas Harte
6c854e8ecc
Simplify is_supervisor semantics.
2022-05-13 07:53:40 -04:00
Thomas Harte
2e796f31d4
Support interrupts; documentation to come.
2022-05-12 20:52:24 -04:00
Thomas Harte
3d8f5d4302
Improve failure logging.
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This confirms that it's only the *BCDs and DIVU/DIVS in which I do not match the tests.
2022-05-12 20:23:32 -04:00
Thomas Harte
2fa6b2301b
Move string logic into Preinstruction.
2022-05-12 19:46:08 -04:00
