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151 Commits

Author SHA1 Message Date
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
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
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
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
c635720a09 Tidy up; provide a notification for bit-change operations. 2022-05-10 08:23:25 -04:00
Thomas Harte
f2a6a12f79 Remove further vestiges of timing. 2022-05-09 20:58:51 -04:00
Thomas Harte
7445c617bc Start removing 68000-specific timing calculations. 2022-05-09 20:32:02 -04:00
Thomas Harte
2ca1eb4cf8 Move set_pc into the operation-specific group. 2022-05-09 16:20:15 -04:00
Thomas Harte
0af8660181 Remove add_pc and decline_branch in favour of operation-specific signals. 2022-05-09 16:19:25 -04:00
Thomas Harte
2f7cff84d9 Enable missing rotates and shifts. 2022-05-09 11:26:01 -04:00
Thomas Harte
8e5650fde9 Clean up Instruction.hpp. 2022-05-09 10:13:42 -04:00
Thomas Harte
539932dc56 Provide function codes. TODO: optionally. 2022-05-09 09:18:02 -04:00
Thomas Harte
e35de357fa Route reads and writes through a common path. 2022-05-08 17:17:46 -04:00
Thomas Harte
0818fd7828 Ensure no status updates fall through the cracks. 2022-05-07 21:29:12 -04:00
Thomas Harte
bf8c97abbb Permit TRAP, TRAPV and CHK to push the next PC rather than the current. 2022-05-07 20:32:39 -04:00
Thomas Harte
ad6cf5e401 Pull out magic constant, simplify sp and TAS. 2022-05-07 20:20:24 -04:00
Thomas Harte
2b3900fd14 Fix LINK A7. 2022-05-07 08:15:26 -04:00
Thomas Harte
1defeca1ad Implement RTS, RTR, RTE. 2022-05-06 12:30:49 -04:00
Thomas Harte
ac6a9ab631 Fix TAS Dn. 2022-05-06 12:23:04 -04:00
Thomas Harte
8176bb6f79 Expose issues with TST and TAS. 2022-05-06 12:18:56 -04:00
Thomas Harte
9c266d4316 Proceed to unimplemented TST. 2022-05-06 11:33:57 -04:00
Thomas Harte
190a351a29 Fix address writeback. 2022-05-06 09:56:01 -04:00
Thomas Harte
607ddd2f78 Preserve MOVEM order in Operation. 2022-05-06 09:45:06 -04:00
Thomas Harte
fed79a116f Be overt about the size being described here. 2022-05-06 09:22:38 -04:00
Thomas Harte
5db0ea0236 Add note for my tomorrow self. 2022-05-05 21:11:02 -04:00
Thomas Harte
06fe320cc0 Correct source counting, but this leaves the operands still being the wrong way around. 2022-05-05 21:06:53 -04:00
Thomas Harte
f7991e18de Makes a failed attempt to implement MOVEM to registers. 2022-05-05 20:32:21 -04:00
Thomas Harte
d7d0a5c15e Implement MOVEM to memory. 2022-05-05 18:51:29 -04:00
Thomas Harte
47f4bbeec6 Switch to a contiguous block of 16 registers. 2022-05-05 15:31:59 -04:00
Thomas Harte
9ab70b340c Route MOVEM appropriately. 2022-05-05 12:42:57 -04:00
Thomas Harte
70cdc2ca9f Fix MOVEP to register. 
Advance to lack of MOVEM.
 2022-05-05 12:37:47 -04:00
Thomas Harte
67462c2f92 Rewire MOVEP. 2022-05-05 12:27:36 -04:00
Thomas Harte
4a4e786060 Hit a realisation: write-back isn't going to work with MOVEP as formulated. 2022-05-05 09:26:26 -04:00
Thomas Harte
665f2d4c00 Attempts MOVEP. 2022-05-05 09:00:33 -04:00
Thomas Harte
64586ca7ba Implement BTST/etc. 2022-05-04 20:57:22 -04:00
Thomas Harte
15c90e546f Fix rotates and shifts to memory. 2022-05-04 19:44:59 -04:00
Thomas Harte
5d1d94848c Take a bash at LINK and UNLK. 2022-05-04 08:26:11 -04:00
Thomas Harte
de58ec71fd Fix EXT, SWAP. 2022-05-03 20:17:36 -04:00
Thomas Harte
052ba80fd7 Add enough wiring to complete but fail EXT and JMP/JSR. 2022-05-03 15:49:55 -04:00
Thomas Harte
af973138df Correct decoding of Bcc.b, satisfying Bcc and BSR tests. 2022-05-03 15:32:54 -04:00
Thomas Harte
5a87506f3d Fix Bcc, making decision that add_pc is relative to start of instruction. 2022-05-03 15:21:42 -04:00
Thomas Harte
90f0005cf2 Proceed to failing Bcc and flagging up my lack of an implementation for BSR. 2022-05-03 14:45:49 -04:00
Thomas Harte
d8b3748d24 Fix Scc size, DBcc behaviour. 2022-05-03 14:40:51 -04:00
Thomas Harte
1b224c961e Fix Scc, add operand flags for DBcc. 2022-05-03 14:23:57 -04:00
Thomas Harte
b3cf13775b Consume operand_flags into Instruction.hpp. 2022-05-03 11:09:57 -04:00
Thomas Harte
c61809f0c4 Add CMPAl. 2022-05-03 09:20:02 -04:00
Thomas Harte
2f2d6bc08b Correct CMPw. 2022-05-03 09:05:34 -04:00
Thomas Harte
1bb809098c Switch — messily — to a more compact way of indicating sequence. 2022-05-03 09:04:54 -04:00
Thomas Harte
011506f00d Add basic exceptions. 2022-05-02 21:27:58 -04:00
Thomas Harte
25ab478461 Fix immediate byte and word fetches. 2022-05-02 20:17:44 -04:00
Thomas Harte
7efe30f34c Fix (d8, _, Xn) calculation. 2022-05-02 15:09:59 -04:00
Thomas Harte
3827ecd6d3 Proceed to complete test running. 2022-05-02 12:57:45 -04:00
Thomas Harte
73f340586d Proceed to building, but failing tests. 2022-05-02 07:45:07 -04:00
Thomas Harte
56fe00c5fb Correct errors preparatory to Executor's lack of flow controller actions. 2022-05-01 20:40:57 -04:00
Thomas Harte
3c26177239 Provide both compile- and run-time operation selection options. 2022-05-01 17:39:56 -04:00
Thomas Harte
fe8f0d960d Equivocate. 
(Specifically: addresses cannot generally be obtained in advance, as they are often the product of registers, but things like displacements, immediate values and absolute addresses can)
 2022-05-01 15:30:03 -04:00
Thomas Harte
c72caef4fd Correct further size specifiers. 2022-05-01 15:21:58 -04:00
Thomas Harte
0720a391e8 Correct address register mutations. 2022-05-01 15:18:06 -04:00
Thomas Harte
d16ac70a50 Correct include path. 2022-05-01 15:14:12 -04:00
Thomas Harte
fc8e020436 Improve field name. 2022-05-01 15:12:13 -04:00
Thomas Harte
6b073c6067 Attempt to round out addressing modes, shift to a header, as per templating on BusHandler. 2022-05-01 15:10:54 -04:00
Thomas Harte
52f355db24 Decision: operation is not a template parameter. Hence can use condition as fully typed. 2022-04-30 14:08:51 -04:00
Thomas Harte
e4426dc952 Introduce calculate EA steps. 2022-04-29 20:30:48 -04:00
Thomas Harte
9359f6477b Start drafting an Executor. 2022-04-29 17:12:06 -04:00
Thomas Harte
78b60dbd1a Evict MOVEM and MOVEP, enable TRAP and TRAPV, complete CHK. 2022-04-29 14:43:30 -04:00
Thomas Harte
8066b19f93 Correct typos. 2022-04-29 07:57:02 -04:00
Thomas Harte
abd2a831a3 Added a further ambiguity. 2022-04-29 05:08:44 -04:00
Thomas Harte
824d3ae3f7 Conclusion: a union does produce better code. 
(But needn't be so verbose)
 2022-04-29 04:51:02 -04:00
Thomas Harte
727a14c6f9 Add notes for myself on decisions yet to make. 2022-04-29 03:53:17 -04:00
Thomas Harte
13d20137d3 Tackle two lingering references to exception_handler. 2022-04-29 03:38:23 -04:00
Thomas Harte
33c9ea2cf7 A flow controller feels more natural than an exception handler. 2022-04-28 20:42:04 -04:00