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Commit Graph

117 Commits

Author SHA1 Message Date
Thomas Harte
4ddbf095f3 Fully banish flush from the processors. 2022-07-12 10:49:53 -04:00
Thomas Harte
c2938a4f63 Avoid potential classic macro error with address. 2022-06-29 15:09:52 -04:00
Thomas Harte
4467eb1c41 Ensure relevant throwaway stack reads use the previous stack address.
TODO: can CycleFetchPreviousThrowaway be used more widely?
2022-06-24 14:00:03 -04:00
Thomas Harte
069a057a94 Resolve assumption of arithmetic shifts. 2022-06-24 07:26:07 -04:00
Thomas Harte
4ed3b21bf3 Decimal SBC tweak: negative partial results don't cause carry. 2022-06-23 21:58:09 -04:00
Thomas Harte
da552abf75 Fix BIT overflow flag. 2022-06-23 15:24:51 -04:00
Thomas Harte
380b5141fb Be overt about conversion wanted here. 2022-06-23 13:03:26 -04:00
Thomas Harte
66775b2c4e Always consume a second cycle in 16-bit mode. 2022-06-23 12:46:51 -04:00
Thomas Harte
2c12a7d968 Make absolutely sure there's no address bit 24. 2022-06-23 12:12:02 -04:00
Thomas Harte
5a97c09238 Flip internal presumption on the BRK flag. 2022-06-23 11:23:00 -04:00
Thomas Harte
3112376943 Don't include DBR in direct indexed indirect. 2022-06-23 11:03:37 -04:00
Thomas Harte
a72dd96dc6 Page boundary crossing is free outside of emulation mode. 2022-06-22 15:31:30 -04:00
Thomas Harte
76767110b7 Fix overflow for 8-bit calculations; essentially a revert for ADC. 2022-06-22 15:18:47 -04:00
Thomas Harte
7dcfa9eb65 65816: improve decimal calculations, posted IO addresses, read/write during redundant read-modify-write cycle. 2022-06-21 14:33:06 -04:00
Thomas Harte
ec98736bd7 Ensure IO cycles don't produce an address of (PC+1). 2022-06-21 11:41:05 -04:00
Thomas Harte
586ef4810b Add restart_operation_fetch, to aid with testing. 2022-06-18 16:25:57 -04:00
Thomas Harte
c8471eb993 Adds various asserts, some comments. 2021-03-03 20:47:45 -05:00
Thomas Harte
f6466fd657 Remove temporary hackery. 2021-02-19 22:47:50 -05:00
Thomas Harte
72d7901c88 Takes a shot at the keyboard data full flag.
Just a guess. But likely?
2021-02-19 20:06:12 -05:00
Thomas Harte
992ee6d631 Don't zero out the program bank until after it has headed stackward. 2021-02-17 22:08:08 -05:00
Thomas Harte
3c887aff95 Improves consistency. 2021-01-21 18:58:22 -05:00
Thomas Harte
e0b36c9c3d Corrects PBR/DBR resetting upon an exception. 2020-12-29 15:27:49 -05:00
Thomas Harte
574a37814c Attempts to fix exception selection and timing. 2020-12-08 18:46:30 -05:00
Thomas Harte
c72bdd776e Adds a new assert: I think this is the issue getting into GS/OS. 2020-12-07 22:43:24 -05:00
Thomas Harte
8ace258fbc Tackles outstanding GCC warnings. 2020-11-22 21:43:56 -05:00
Thomas Harte
cdacf280e1 After much extra logging, corrects destination bank for MVN and MVP. 2020-11-15 16:08:29 -05:00
Thomas Harte
d3c7253981 Shifts size-limiting of X and Y to transitions and mutations, away from reads.
Primarily to remove potential bug-causing complexity — this is easier to debug. But let's see.
2020-11-04 20:35:41 -05:00
Thomas Harte
d50b059a17 Imports 6502-esque test for decimal SBC overflow.
All applicable krom tests now pass.
2020-11-03 20:37:30 -05:00
Thomas Harte
cc5ec78156 Provides something on WAI/STP; sizes STY by the x flag; disables MSC test. 2020-11-03 20:17:44 -05:00
Thomas Harte
5cbb91f352 Fixes COP vector, ensures WDM skips a byte. 2020-11-03 20:01:02 -05:00
Thomas Harte
91ea2eff4c Corrects MVN/MVP off-by-one and failure to store what was read. 2020-11-03 18:29:35 -05:00
Thomas Harte
bf85d71674 Brings ADC into conformance. Fixes JML. 2020-11-03 18:12:10 -05:00
Thomas Harte
7f3f6c339f Corrects stacked program bank during native-mode exceptions. 2020-10-30 20:11:39 -04:00
Thomas Harte
1df2ce513a Ensures that reset doesn't push to the stack. 2020-10-28 21:23:35 -04:00
Thomas Harte
1e4679ae14 Corrects JSL and RTL. 2020-10-28 17:25:40 -04:00
Thomas Harte
b3ab9fff9b Imports a custom-built copy of Klaus Dormann's 65C02 test, with only 65816-compatible parts.
Thereby fixes another couple of 65816 issues — BRK(, etc) not clearing the decimal flag, and `TRB d` being mismapped.
2020-10-19 19:27:16 -04:00
Thomas Harte
76d9893866 Declares address-bus sizes formally.
This allows me to fix the final two implicit conversion warnings, albeit that it would have been nice to find a templatey way just to get the type directly from the declaration of `perform_bus_operation`.
2020-10-18 15:08:21 -04:00
Thomas Harte
c3f8982c62 Resolves all internal implicit type-conversion warnings.
Chasing those down, it looks like flags were wrong for PLB and PLD. So it's official: warnings help.
2020-10-18 14:55:17 -04:00
Thomas Harte
99eba2f8ba Ensures intended 65816 exception behaviour.
i.e. the relevant micro-op sequence exists, and its operation isn't lost. Also sets the 65816 by default to jump straight into power-on, not to execute an instruction first. That shouldn't make a functional difference, but it makes debugging easier because it makes startup fully deterministic.
2020-10-18 14:43:47 -04:00
Thomas Harte
3b398f7a9a Attempts to complete all 65816 bus signalling. 2020-10-16 21:56:20 -04:00
Thomas Harte
096add7551 Exposes non-BusOperation bus outputs. 2020-10-16 21:05:42 -04:00
Thomas Harte
334e0666b7 Reports ::Ready upon a WAI. 2020-10-15 21:37:37 -04:00
Thomas Harte
98c81749c8 Adds the conventional flush. 2020-10-15 21:36:04 -04:00
Thomas Harte
7aa6cf4c6b Tidies up layout very slightly. 2020-10-15 20:51:23 -04:00
Thomas Harte
dfda2adf0d Attempts implementations of both ready and abort.
Which I think concludes the inputs?
2020-10-15 20:46:18 -04:00
Thomas Harte
c0a1c34012 Wraps all registers into a struct, so that I can implement abort.
Makes some preparations for ready too.
2020-10-15 18:42:38 -04:00
Thomas Harte
3c6adc1ff4 Completes 65816 addressing mode tests and corresponding fixes. 2020-10-14 22:00:52 -04:00
Thomas Harte
e511d33a7c Adds test for [d], y; fixes implementation. 2020-10-14 21:42:41 -04:00
Thomas Harte
27afb8f0a7 Adds direct indirect long test, and thereby fixes addressing mode.
Nine to go!
2020-10-14 21:26:20 -04:00
Thomas Harte
327ab81436 Fills in direct, x and (direct) tests, fixing implementation of the latter.
10 to go.
2020-10-14 21:17:28 -04:00