Thomas Harte
269263eecf
Implement RTE, RTS, RTR.
2022-05-22 21:16:38 -04:00
Thomas Harte
faef5633f8
Ensure MOVE from SR has an effective address to write to.
2022-05-22 20:52:00 -04:00
Thomas Harte
7d1f1a3175
Implement MOVE [to/from] [CCR/SR].
2022-05-22 19:45:22 -04:00
Thomas Harte
4e34727195
Fully implement TAS.
2022-05-22 16:14:03 -04:00
Thomas Harte
1dd6ed6ae3
Implement TAS Dn, with detour for other TASes.
2022-05-22 16:08:30 -04:00
Thomas Harte
3b68b9a83b
Implement PEA.
2022-05-22 11:27:38 -04:00
Thomas Harte
4279ce87ea
Implement LEA.
2022-05-22 08:29:12 -04:00
Thomas Harte
3c1c4f89e9
Add MULU/S functionality, though not timing.
2022-05-22 08:02:32 -04:00
Thomas Harte
4a6512f5d5
Reduce dispatch boilerplate.
2022-05-22 07:39:16 -04:00
Thomas Harte
284f23c6ea
Implement JMP.
2022-05-22 07:16:38 -04:00
Thomas Harte
11a9a5c126
Use common macros for the two forms of Perform.
2022-05-22 07:08:14 -04:00
Thomas Harte
4993801741
Add missing prefetch to BSET, BCHG, BCLR.
2022-05-21 21:05:05 -04:00
Thomas Harte
4b35899a12
Bcc: properly establish offset.
2022-05-21 20:59:34 -04:00
Thomas Harte
1304e930eb
DBcc is two-operand.
2022-05-21 20:06:03 -04:00
Thomas Harte
94288d5a94
Excludes DBcc from standard operand fetch.
2022-05-21 19:53:28 -04:00
Thomas Harte
3811ab1b82
Fix the two 8bit-with-displacement effective address Calc steps.
2022-05-21 16:20:01 -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
2258434326
Ensure proper return addresses are calculated for JSR.
2022-05-21 14:28:44 -04:00
Thomas Harte
e46a3c4046
Implement JSR.
2022-05-21 10:29:36 -04:00
Thomas Harte
0e4cfde657
Fix MOVEM predec.
2022-05-21 08:17:39 -04:00
Thomas Harte
4bd9c36922
Fix postincrement mode.
2022-05-20 21:01:23 -04:00
Thomas Harte
256da43fe5
Fix MOVEM other than postinc and predec.
2022-05-20 20:47:54 -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.
...
Plus a lot of waffle to try to justify the further code duplication.
2022-05-20 16:23:52 -04:00
Thomas Harte
ee942c5c17
Fix PC-relative fetches.
2022-05-20 14:42:51 -04:00
Thomas Harte
d157819c49
Implement the various to-[SR/CCR] actions, which do a 'repeat' prefetch.
...
(which isn't exactly a repeat, at least in the SR cases, because the function code might have changed)
2022-05-20 14:29:14 -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
4327af3760
DBcc: add write-back.
2022-05-20 11:37:18 -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
1ee9c585ca
Fix segue into second operand.
2022-05-19 19:38:42 -04:00
Thomas Harte
efe5a5ac26
Signal will_perform even for invalid instructions.
2022-05-19 18:50:43 -04:00
Thomas Harte
334e3ec529
Add privilege and instruction error exceptions; permit two operands to be stored.
2022-05-19 16:55:16 -04:00
Thomas Harte
282c4121d6
CLR also follows the NEGX/NEG/NOT pattern.
2022-05-19 16:30:08 -04:00
Thomas Harte
6c2eee0e44
Implement CHK, and therefore the standard exception pattern.
2022-05-19 16:27:39 -04:00
Thomas Harte
eeb6a088b8
Add a tag to avoid duplication.
2022-05-19 15:49:42 -04:00
Thomas Harte
22b63fe1f8
Add EXT, and notes to self.
2022-05-19 15:41:02 -04:00
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.
...
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
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.
...
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
1b87626b82
Move some way towards MOVE.
2022-05-18 21:00:10 -04:00
Thomas Harte
da9fb216b1
Remove setup_operation in favour of doing the equivalent inline.
...
... 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
