Thomas Harte
4a6512f5d5
Reduce dispatch boilerplate.
2022-05-22 07:39:16 -04:00
Thomas Harte
f97d2a0eb9
Add DIVU/DIVS, at least as far as getting the correct numeric result.
2022-05-21 15:56:09 -04:00
Thomas Harte
a818650027
Add a faulty attempt at MOVEM.
2022-05-20 18:48:19 -04:00
Thomas Harte
9d79e64f5c
Add a mere calculate effective address pathway.
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Plus a lot of waffle to try to justify the further code duplication.
2022-05-20 16:23:52 -04:00
Thomas Harte
2d91fb5441
Implement MOVEP.
2022-05-20 14:22:32 -04:00
Thomas Harte
81431a5453
Attempt BTST, BCHG, BCLR and BSET.
2022-05-20 12:58:45 -04:00
Thomas Harte
b4978d1452
Implement BSR, adding one more test file to the working set.
2022-05-20 12:40:35 -04:00
Thomas Harte
45e9648b8c
Implement Bcc.
2022-05-20 12:04:43 -04:00
Thomas Harte
860cc63e21
Attempt DBcc.
2022-05-20 11:32:06 -04:00
Thomas Harte
452dd3ccfd
Add a performer call-out for Scc; use it to implement proper timing in the mk2 68000.
2022-05-20 11:20:23 -04:00
Thomas Harte
e5c1621382
Add missing fallthrough, patterns for all ADDs and SUBs.
2022-05-20 07:02:02 -04:00
Thomas Harte
6c2eee0e44
Implement CHK, and therefore the standard exception pattern.
2022-05-19 16:27:39 -04:00
Thomas Harte
0471decfc8
Implement the complete set of fetch addressing modes.
...
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
c6c6213460
Bifurcate the fetch-operand flow.
...
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
bef12f3d65
Move ExecutionState into Implementation.hpp; use goto to avoid some double switches.
...
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
4a40581deb
Completes performance of NBCD D0.
2022-05-17 16:10:20 -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
3db2de7478
Works 68000 mk2 into the comparative tests.
...
... 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
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
