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9,224 Commits 8 Branches 121 Tags 496 MiB
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473 Commits

Author SHA1 Message Date
Thomas Harte
659e4f6987 Include fixed cost of rolls. Which includes providing slightly more information to did_shift. 2022-06-01 20:30:51 -04:00
Thomas Harte
75e85b80aa Factor out the common stuff of exception state. 2022-06-01 08:20:33 -04:00
Thomas Harte
73815ba1dd No need for this hoop jumping here. 2022-06-01 08:20:06 -04:00
Thomas Harte
8ffaf1a8e4 Ensure did_divu/s are performed even upon divide by zero. 2022-05-29 21:18:19 -04:00
Thomas Harte
7788a109b0 Tweak more overtly to avoid divide by zero. 2022-05-29 20:51:50 -04:00
Thomas Harte
3ef53315a2 Don't try to append operands to 'None'. 2022-05-29 15:28:16 -04:00
Thomas Harte
3da720c789 Make requires_supervisor explicitly compile-time usable. 2022-05-29 14:55:24 -04:00
Thomas Harte
c97245e626 Fix CalcEA timing; make MOVEfromSR a read-modify-write. 2022-05-27 10:32:28 -04:00
Thomas Harte
463fbb07f9 Adapt remaining 68000 tests to use Mk2. 2022-05-25 10:55:17 -04:00
Thomas Harte
9e3c2b68d7 Eliminate potential future implicit conversion warnings. 2022-05-24 11:05:24 -04:00
Thomas Harte
3349bcaaed Attempt interrupt support. 2022-05-24 10:53:59 -04:00
Thomas Harte
6a442e0136 MOVEM has an immediate first operand. 2022-05-20 20:34:51 -04:00
Thomas Harte
cb77519af8 Make BSR operate like the other offsets: the flow controller gets whatever was in the opcode. 2022-05-20 12:40:09 -04:00
Thomas Harte
ba8592ceae At least on the 68000, Scc is read-modify-write. 2022-05-20 11:43:26 -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
eeb6a088b8 Add a tag to avoid duplication. 2022-05-19 15:49:42 -04:00
Thomas Harte
e4c0a89889 Just use the four-bit register number directly. 2022-05-19 15:01:09 -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
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
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
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
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
7a2fd93d08 Document BusHandler interface. 2022-05-13 10:59:36 -04:00
Thomas Harte
5b67c9bf4a MOVE to SR requires supervisor privileges. 2022-05-13 09:01:03 -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
2fa6b2301b Move string logic into Preinstruction. 2022-05-12 19:46:08 -04:00
Thomas Harte
a6e4d23c29 Tidy up primarily as per PatickvL's comments. 
... though pulling the flag values out of an enum and into a namespace is entirely my own contribution, to keep them in their own namespace but having them overtly be ints.
 2022-05-12 16:23:07 -04:00
Thomas Harte
6d43576db7 Remove errant semicolon. 2022-05-12 16:21:36 -04:00
Thomas Harte
b7d1bff0c7 Eliminate branches from ABCD. 2022-05-12 15:25:01 -04:00
Thomas Harte
79c5af755f Eliminate branches from SBCD. 2022-05-12 15:18:03 -04:00
Thomas Harte
c6d84e7e60 Use Status::FlagT pervasively. 2022-05-12 11:42:33 -04:00
Thomas Harte
192513656a After much guesswork, fix SBCD and thereby pass flamewing tests. 2022-05-12 11:39:01 -04:00
Thomas Harte
f3c1b1f052 Name flags, remove closing underscores on exposed data fields. 2022-05-12 08:19:41 -04:00
Thomas Harte
bd61c72007 Mutate SBCD to correct values, though not yet statuses. 2022-05-12 07:22:26 -04:00
Thomas Harte
0efeea1294 Slightly improve SBCD. Not there yet though. 2022-05-12 07:07:21 -04:00
Thomas Harte
a9902fc817 Fix ABCD when the result has an invalid lower digit. 2022-05-11 16:31:27 -04:00
Thomas Harte
d492156453 Add noreturn attribute as a warning. 2022-05-11 10:51:48 -04:00
Thomas Harte
96af3d5ec5 Fix infinite inner/outer loop. 2022-05-11 10:26:12 -04:00
Thomas Harte
69ba14e34e Support the trace flag. 2022-05-11 09:39:15 -04:00
Thomas Harte
943c924382 Add missing: MOVE to/from USP, RESET. 2022-05-11 07:52:23 -04:00
Thomas Harte
4b97427937 Remove further magic constants. 2022-05-11 07:00:35 -04:00
Thomas Harte
ab8e1fdcbf Take a swing at access faults and address errors. 2022-05-10 16:20:30 -04:00
Thomas Harte
477979c275 Fully formulate and document the flow controller. 2022-05-10 10:34:07 -04:00