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948 Commits

Author SHA1 Message Date
Thomas Harte
92e72959c3 Makes corrections to ix addressing mode and shift/roll flags. 2020-10-09 23:12:20 -04:00
Thomas Harte
c01bc784b9 Slightly reduces branching. 2020-10-09 22:21:55 -04:00
Thomas Harte
abcd86a294 Fixes accumulator instructions. 2020-10-09 22:18:22 -04:00
Thomas Harte
451f83ba51 Corrects emulation-mode read-modify-writes not to empty the data buffer. 2020-10-09 22:14:42 -04:00
Thomas Harte
b439f40fe2 Corrects INC and DEC. 2020-10-09 22:04:25 -04:00
Thomas Harte
968166b06d Resolves incorrectly flow after setting up an absolute address. 2020-10-09 21:48:35 -04:00
Thomas Harte
0ed98cbfac Attempts to fix direct indirect indexed; not yet successful I think. 2020-10-08 22:15:19 -04:00
Thomas Harte
7dde7cc743 Implements altered direct indexed addressing in emulation mode. 2020-10-08 22:02:14 -04:00
Thomas Harte
755627f12d Corrects direct addressing. 2020-10-08 20:00:01 -04:00
Thomas Harte
f8004d7096 Implements RTI, corrects TAY. 2020-10-08 18:06:11 -04:00
Thomas Harte
0418f51ef2 Takes a shot at emulation-mode 'exceptions'. 
It's just RTI and correct decimal SBC left of the official 6502s now, I think.
 2020-10-08 17:52:13 -04:00
Thomas Harte
054e0af071 Corrects RTS behaviour: the return address on the stack is off by one. 
Dormann's tests now proceed to a BRK.
 2020-10-08 16:55:45 -04:00
Thomas Harte
907c3374c3 Attempts to clean up my JMP/JSR mess. 
Also takes a step forwards in decimal SBC, but it's not right yet.
 2020-10-08 16:48:46 -04:00
Thomas Harte
f83ee97439 PHP pushes with the BRK flag set in emulation mode. 2020-10-07 21:37:50 -04:00
Thomas Harte
19aea85184 Corrects CMP, CPX, CPY carry flags. 2020-10-07 21:23:29 -04:00
Thomas Harte
1ba0a117e7 Corrects PLB, PLD, PLP. 2020-10-07 20:23:53 -04:00
Thomas Harte
b510b9d337 Adds PHD, PHK and 8-bit PHP and PLP. 2020-10-07 20:13:12 -04:00
Thomas Harte
b608e11965 Realises that not all non-incrementing PC fetches should be thrown away. 2020-10-07 20:06:27 -04:00
Thomas Harte
e68b3a2f32 Corrects JMP program. 2020-10-07 19:59:29 -04:00
Thomas Harte
f7b119ffe1 Moves temporary logging, fixes branch instructions. 2020-10-07 19:57:58 -04:00
Thomas Harte
a4cec95db1 Corrects load and transfer flag oversights. 2020-10-07 19:36:23 -04:00
Thomas Harte
84c4fa197b Corrects DEX mapping, notes new Dormann failure case. 2020-10-07 18:48:03 -04:00
Thomas Harte
eac722cf59 Implements enough of ADC and SBC for the Dormann test definitively to fail. 2020-10-07 18:36:17 -04:00
Thomas Harte
7439a326a6 Implements BIT (in regular and immediate forms). 2020-10-07 18:15:18 -04:00
Thomas Harte
5ca1c0747f Generalises CMP to implement CPX and CPY. 2020-10-07 18:09:56 -04:00
Thomas Harte
466ca38dfa Corrects TXY and TYX; kudos to PatrickvL for the spot! 2020-10-07 18:05:42 -04:00
Thomas Harte
93b0839036 Knocks out some transfer operations. 
I'm possibly only seven or eight away from being able to test with complete official-opcode-only 6502 code?
 2020-10-06 22:29:34 -04:00
Thomas Harte
e068cbc103 Implements CMP and fixes a zero-flag error on 16-bit operations. 2020-10-06 21:47:26 -04:00
Thomas Harte
5c809e5fbf Implements rolls and shifts. 2020-10-06 21:34:39 -04:00
Thomas Harte
3933bf49cf Implements BRL. 2020-10-06 21:28:54 -04:00
Thomas Harte
7065ba4857 Implements the single-byte branches. 2020-10-06 21:24:43 -04:00
Thomas Harte
ebff83018e Implements the bitwise operators. 2020-10-06 20:17:03 -04:00
Thomas Harte
9ce9167e3c Formalises work left to do. 2020-10-06 19:12:19 -04:00
Thomas Harte
993eff1d3d Starts slowly, with flag manipulation. 2020-10-06 16:25:30 -04:00
Thomas Harte
7be983ec00 Slightly improve exposition. 2020-10-05 22:25:20 -04:00
Thomas Harte
18e8d6ce06 Makes an effort to factor out the 6502's [lazy] flags. 
This is preparatory to deciding which instructions, if any, are worth factoring out.
 2020-10-05 22:23:33 -04:00
Thomas Harte
b7ba0d4327 Attempts to complete all addressing modes. 
So, if bugs didn't exist, it'd just be members of the Operation enum to go.
 2020-10-05 17:04:57 -04:00
Thomas Harte
825201f4f2 Adds direct indirect. 2020-10-04 22:11:41 -04:00
Thomas Harte
9a05c68ce7 Attempts direct and direct indexed indirect. 2020-10-04 22:06:25 -04:00
Thomas Harte
d8dccf2500 Attempts a full implementation of MVN and MVP. 2020-10-04 19:21:04 -04:00
Thomas Harte
b416aa640f Slightly tidies up, eliminating some store bugs. 2020-10-04 19:12:04 -04:00
Thomas Harte
4ebf594b3b This should bring me up to absolute, y. 
i.e. next is datasheet program 7.
 2020-10-04 19:02:47 -04:00
Thomas Harte
8a83024962 Starts a dash towards just completing the addressing modes for now. 
This brings me up to the end of absolute long (i.e. 4a on the datasheet).
 2020-10-04 18:52:46 -04:00
Thomas Harte
bdc1136b96 Edges towards working short absolute addressing mode. 2020-10-03 21:30:24 -04:00
Thomas Harte
b83d93abc2 Accepts that whether instructions do 8- or 16-bit bus accesses depends on either M or X depending on the operation. 2020-10-02 17:08:30 -04:00
Thomas Harte
36f843bc6e Ensure std::function is visible to 65816Storage.cpp. 2020-09-29 19:23:38 -04:00
Thomas Harte
15c87e02e9 Ditto for printf. 2020-09-29 18:53:02 -04:00
Thomas Harte
00923eac7c Ensure assert is visible to 65816Implementation.hpp. 2020-09-29 18:52:25 -04:00
Thomas Harte
78b3ec4b10 The actual work begins: starts implementing 65816 micro-ops. 2020-09-29 18:42:07 -04:00
Thomas Harte
ef1a514785 Introduces 6502Selector, for picking either a 6502 or a 65816 based on a single template parameter. 2020-09-28 21:35:46 -04:00
Thomas Harte
6635876e7e Performs a bare factoring out of the 6502 bus handler. 2020-09-28 18:43:53 -04:00
Thomas Harte
5645f90abe Takes a minor first step towards actually performing 65816 instructions. 2020-09-27 22:20:58 -04:00
Thomas Harte
ad8a2e2cb9 Corrects a long-standing naming obscurity. 2020-09-27 22:19:42 -04:00
Thomas Harte
8641494809 Resolve various test-case warnings. 2020-09-27 15:10:29 -04:00
Thomas Harte
5449e90b34 Edges towards offering the 65816 as another type of 6502 for testing. 2020-09-26 22:31:50 -04:00
Thomas Harte
1cd664ad85 Adds a sanity check. 2020-09-26 21:43:26 -04:00
Thomas Harte
e680022b1f Completes the opcode set. 
A million bugs yet to find.
 2020-09-26 21:35:31 -04:00
Thomas Harte
67c2ce2174 Takes a run at completing the stack section. 
I'm not really sure about BRK though — does it gain a signature on the 65816?
 2020-09-26 21:20:01 -04:00
Thomas Harte
596e700b60 Drags myself onto the final page of bus programs. 
233 opcodes now complete; six bus programs to go.
 2020-09-26 20:57:24 -04:00
Thomas Harte
4a53b6e538 Adds push and pull, reaching 229/256 opcodes. 2020-09-26 20:38:29 -04:00
Thomas Harte
687f4bb3bb Adds relative and relative long bus patterns. 
Many of the rest cover only one or two opcodes so this puts me at 216/256 opcodes covered; 35/47 bus programs; just more than 5/7 pages.
 2020-09-26 20:24:50 -04:00
Thomas Harte
473799cb62 There's not a lot to STP and WAI from a bus program point of view. 2020-09-26 20:18:30 -04:00
Thomas Harte
3dc22a9fd5 Adds implied and immediate modes. 
... for 204/256 opcodes covered.
 2020-09-26 17:42:42 -04:00
Thomas Harte
f54b655606 Adds d, x and d, y. 2020-09-26 17:26:17 -04:00
Thomas Harte
d2e868ea2b Adds (d), y; [d], y; and [d]. 
Now covered: 146/256 opcodes, 4/7 pages, 25/47 bus programs.
 2020-09-26 16:55:58 -04:00
Thomas Harte
3fc649359a Transcribes the titles of all remaining bus programs. 
Thereby frames the distance yet to travel.
 2020-09-25 22:29:19 -04:00
Thomas Harte
1512ac11da Adds (d, x) and (d) modes. Albeit by deferring the hard work. 
That's: 122/256 opcodes; 22/47 bus programs, ~3.5/7 pages transcribed. Maybe I'll be able to get to the runtime stuff sooner rather than later?
 2020-09-25 22:22:30 -04:00
Thomas Harte
5039cc7bb2 Adds direct page. 
... to cover 106 opcodes.
 2020-09-25 22:01:36 -04:00
Thomas Harte
5360a7b4ce Adds block moves. 
These are fairly specialised, dealing in two data addresses simultaneously.
 2020-09-25 21:49:03 -04:00
Thomas Harte
2957a31f40 Adds absolute, x; absolute,y; and accumulator addressing modes. 
Now covered: 80/256 opcodes, from 2/6 pages of the data sheet; or 16/47 bus programs.
 2020-09-25 21:16:36 -04:00
Thomas Harte
8c11df52bf Adds absolute long, x. 
Factors out the commonality of a closing read/write while I'm here.
 2020-09-25 19:27:17 -04:00
Thomas Harte
2b7ffcd48f Takes a run at JSL al. 2020-09-25 18:35:00 -04:00
Thomas Harte
7980a9033e Adds two-thirds of absolute long. 
Working total: 31 opcodes covered; 10/47ths of bus patterns.

Next is JSL, which I think will require additional operations.
 2020-09-25 18:16:49 -04:00
Thomas Harte
125ddfa513 Pays a little attention to runtime storage; completes the first page of bus patterns. 2020-09-25 18:00:02 -04:00
Thomas Harte
636e929607 Adds a check for 8/16-bit redundancy. 2020-09-25 17:42:42 -04:00
Thomas Harte
22c792dc46 Adds enough logic to start serialising instructions to somewhere. 
Possibly extraneous for now, but it means I can start stepping and testing.
 2020-09-25 17:18:25 -04:00
Thomas Harte
95af1815c8 Completes absolute indexed indirect micro-ops. 
For the record: this is just six out of forty-seven codes complete. Or about two-thirds of six pages. Plenty to do even before I start trying to interpret these things.
 2020-09-24 22:37:31 -04:00
Thomas Harte
d707c5ac95 Switches to generators with stable pointers; adds 2a. 2020-09-24 22:27:20 -04:00
Thomas Harte
5c9192e5e6 Switches to generators for spitting out micro-ops. 
Hopefully with a lot of parts to factor out naturally.
 2020-09-24 17:36:11 -04:00
Thomas Harte
72b5584042 Immediately runs afoul of a read/write difference in the specs between 8/16-bit mode that suggests maybe this isn't a good structure. 
Perhaps generators of some sort?
 2020-09-23 22:28:15 -04:00
Thomas Harte
f9045b5352 Rounds out declaration of the absolutes. 2020-09-23 22:23:23 -04:00
Thomas Harte
f87fe92bc8 Begins a meandering road towards the 65816. 2020-09-23 22:14:42 -04:00
Thomas Harte
402f2ddbd9 Increases likelihood of 68000 Program offset-size assumptions being met. 2020-07-02 22:24:04 -04:00
Thomas Harte
6e4b8d58a5 Completes [[fallthrough]]s. 2020-06-19 23:50:37 -04:00
Thomas Harte
945a9da94f Adds further [[fallthrough]]s. 2020-06-19 23:44:20 -04:00
Thomas Harte
2477752fa4 Adds further [[fallthrough]] attributes. 2020-06-19 23:36:51 -04:00
Thomas Harte
91229a1dbd Adds overt fallthrough attributes. 2020-06-19 23:22:29 -04:00
Thomas Harte
73131735fa Further qmake warning corrections. 2020-05-30 19:31:17 -04:00
Thomas Harte
267006782f Starts to add Qt target; resolves many build warnings. 2020-05-30 00:37:06 -04:00
Thomas Harte
512a52e88d Increases const correctness, marks some additional constructors as constexpr, switches std::atomic construction style. 2020-05-20 23:34:26 -04:00
Thomas Harte
28881cb391 Implements apply. 2020-05-19 18:27:10 -04:00
Thomas Harte
a16b710d22 Removes <cassert> from Struct.h (which means it's needed in the 68000's State). 2020-05-19 00:06:29 -04:00
Thomas Harte
a3d4c7599b Attempts fully to capture 68000 state. 
Albeit that it can't be put back yet.
 2020-05-18 23:55:54 -04:00
Thomas Harte
6f16928215 Adds all remaining simple scalar fields. 2020-05-16 22:47:04 -04:00
Thomas Harte
57edfe8751 Formalises TODO list and marches onward into execution state. 2020-05-16 18:31:43 -04:00
Thomas Harte
dcc0ee3679 Adds input line capture. 2020-05-16 17:44:15 -04:00
Thomas Harte
f7a16762b4 Starts populating the 68000 state registers. 2020-05-16 00:06:04 -04:00
Thomas Harte
8b76d4007e Starts adding State for the 68000. 2020-05-14 22:46:40 -04:00
Thomas Harte
c5b746543b Factors the half mask into steps count. 2020-05-14 00:09:01 -04:00
Thomas Harte
11d936331d Attempts to preserve scheduled_program_counter_. 2020-05-13 23:58:04 -04:00
Thomas Harte
3709aa7555 Edges almost up to an initially complete implementation. 2020-05-13 22:04:04 -04:00
Thomas Harte
7c9d9ee048 Adds basic Z80 state. 2020-05-13 20:15:22 -04:00
Thomas Harte
66c2eb0414 Further tightens const and constexpr usage. 2020-05-12 22:22:21 -04:00
Thomas Harte
25996ce180 Further doubles down on construction syntax for type conversions. 2020-05-09 23:00:39 -04:00
Thomas Harte
cc357a6afa Removes boilerplate from header. 2020-04-02 19:15:57 -04:00
Thomas Harte
dfc1c7d358 Separates 6502 State object to make it optional. 
Also makes a few minor const improvements while I'm poking around.
 2020-04-02 19:11:27 -04:00
Thomas Harte
7ed8e33622 Eliminates unused 6502 counter. 2020-04-02 18:49:28 -04:00
Thomas Harte
a491650c8b Adds safety asserts. 2020-03-30 21:39:31 -04:00
Thomas Harte
95c68c76e1 Corrects use of StructImpl. 2020-03-30 00:27:40 -04:00
Thomas Harte
edc553fa1d Removes duplicative 'register'. 2020-03-29 22:58:00 -04:00
Thomas Harte
4f2ebad8e0 Takes a shot a set_state. 2020-03-29 22:50:30 -04:00
Thomas Harte
cfb75b58ca Pulls all 6502 MicroOp sequences into the main operations_ table. 
This will make state restoration somewhat more tractable.
 2020-03-29 18:36:41 -04:00
Thomas Harte
4fbe983527 Provisionally adds State and get_state to the 6502. 
`set_state` may be a little more complicated, requiring a way to advance in single-cycle steps **without applying bus accesses**.
 2020-03-28 00:33:27 -04:00
Thomas Harte
a51fe70498 Standardises cast syntax. 2020-03-06 21:55:00 -05:00
Thomas Harte
b971e2a42c Adds get_is_resetting to the Z80, eliminating the CPC's custom version. 2020-02-29 19:58:25 -05:00
Thomas Harte
01faffd5bf Corrects memptr behaviour of OTIR/OTDR and INIR/INDR. 
This seemingly perfects memptr.
 2020-02-27 20:55:43 -05:00
Thomas Harte
26de5be07c Corrects memptr behaviour of LDIR/LDDR and CPIR/CPDR. 2020-02-27 20:44:53 -05:00
Thomas Harte
87474d5916 Corrects memptr behaviour of OUT (C), 0. 2020-02-27 20:38:27 -05:00
Thomas Harte
06163165d9 Corrects memptr effect of LD rr, (nn). 2020-02-26 22:22:54 -05:00
Thomas Harte
ec82c075be Fixes memptr for IN C, (C). 2020-02-26 22:19:37 -05:00
Thomas Harte
3b0df172a7 Corrects memptr behaviour of JP nn. 2020-02-26 22:02:15 -05:00
Thomas Harte
7058dbc3cc Corrects memptr for LD HL, (nn). 2020-02-26 21:54:49 -05:00
Thomas Harte
b64de89d2d Corrects JR memptrs. 2020-02-26 21:47:34 -05:00
Thomas Harte
8878396339 Corrects DJNZ memptr behaviour. 2020-02-26 21:42:31 -05:00
Thomas Harte
3097c4ccae Improves MEMPTR testing and some results. 2020-02-24 23:32:18 -05:00
Thomas Harte
7959d243f6 Adds single-stepping. Of a kind. 2020-02-24 23:31:42 -05:00
Thomas Harte
79dd402bc8 Consolidates different test port input selection. 2020-02-23 16:12:28 -05:00
Thomas Harte
3f3229851b Implements MEMPTR for IN. 2020-02-23 00:32:33 -05:00
Thomas Harte
dca79ea10e Requires trace flag currently set. 2020-01-18 22:52:53 -05:00
Thomas Harte
b7fd4de32f Ensures a one-instruction latency on the trace flag. 2020-01-18 22:06:00 -05:00
Thomas Harte
9f2f547932 Adds and satisfies test on the function code word. 
Thanks to ijor's "68000 Address and Bus Error Stack Frame" re: contents.
 2020-01-04 23:58:07 -05:00
Thomas Harte
f0d5bbecf2 Introduces a test of stack contents after an address error. 
Fixes: stacked PC, address of fault.
 2020-01-04 23:22:07 -05:00
Thomas Harte
a28c52c250 Fixes A7-relative JSRs. 
I completely withdraw my earlier statement re: the test cases.
 2020-01-04 22:22:33 -05:00
Thomas Harte
7de1181213 Make a new guess at post-overflow DIV flags, based on tests. 
Specifically: for DIVU, stick with the current guess of a fixed set. For DIVS, leave N and Z alone.
 2020-01-03 23:44:49 -05:00
Thomas Harte
c7a5b054db There's no TODO here; overflow is always 0 for a 16x16 multiply. 
... and the original 68000 doesn't support 32x32 multiplies.
 2020-01-03 22:44:19 -05:00
Thomas Harte
2f8078db22 Switches to should_log as a global when I'm hacking about. 2020-01-02 20:15:48 -05:00
Thomas Harte
5be30b1f7b Introduces further comparative tests, prompting a new CHK fix. 
Specifically: how to set N when both is_under and is_over are true, and to eliminate a failure fully to prefetch in the longer addressing modes.
 2020-01-01 19:11:36 -05:00
Thomas Harte
b184426f2b Ensure that an interrupt from a STOP doesn't return to the STOP. 2020-01-01 14:51:47 -05:00
Thomas Harte
1de4f179c0 Adds more thorough comment on the bus program used. 2019-12-25 19:49:49 -05:00
Thomas Harte
3cb5684d95 Fixes RTR: the whole top half of the SR should be preserved. 
Specifically, the 68000 Reference Manual says: "The supervisor portion of the status register is unaffected." Clearly when I first read that I misread it as the supervisor _flag_ (rather than _portion_) should be preserved.
 2019-12-25 19:49:20 -05:00
Thomas Harte
274867579b Deploys constexpr as a stricter const. 2019-12-22 00:22:17 -05:00
Thomas Harte
cf16f41939 Makes value8_high/low and value16 branchless. 2019-12-21 20:58:37 -05:00
Thomas Harte
08f2877382 I think the 68000 actually loads a byte value onto both the upper and lower data lines. 2019-12-21 20:37:03 -05:00
Thomas Harte
a3e64cae41 Corrects SBCD carry. 2019-12-17 22:16:02 -05:00
Thomas Harte
8a2ac87209 Reverted SBCD/NBCD V behaviour. 2019-12-16 23:08:59 -05:00
Thomas Harte
096b447b4b Corrects MOVE -(An), SR/CCR, which was not previously decrementing. 
Also adds a safety check against other instances of the same error. There seem to be none.
 2019-12-16 22:38:54 -05:00
Thomas Harte
84167af54f Corrects CHK N flag. 2019-12-16 20:01:33 -05:00
Thomas Harte
8be26502c4 Fixes NBCD -(An)+, adds some additional comments. 2019-12-16 20:01:19 -05:00
Thomas Harte
4c068e9bb8 Corrects flags on CMPA.w. 2019-12-15 20:39:47 -05:00
Thomas Harte
dc1abd874e Corrects indentation typo. 2019-12-14 23:52:53 -05:00