Thomas Harte
8ada73b283
Use the outer switch for addressing mode dispatch, saving a lot of syntax.
2022-06-13 08:57:49 -04:00
Thomas Harte
71e38a6781
Fix decoding of RESET.
2022-06-03 11:15:50 -04:00
Thomas Harte
02b6ea6c46
Factor out would-accept-interrupt test, per uncertainty re: level 7.
2022-06-03 08:31:56 -04:00
Thomas Harte
c3b436fe96
Use int64_t as an intermediary to avoid x86 exception on INT_MIN/-1.
2022-06-02 21:39:52 -04:00
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
