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Z80.c
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/* Z80 v0.2
______ ______ ______
/\___ \/\ __ \\ __ \
____ \/__/ /\_\ __ \\ \/\ \ ________________________________________________
| /\_____\\_____\\_____\ |
| Zilog \/_____//_____//_____/ CPU Emulator |
| Copyright (C) 1999-2025 Manuel Sainz de Baranda y Goñi. |
| |
| This emulator is free software: you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation, either version 3 of the License, or (at your |
| option) any later version. |
| |
| This emulator is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this emulator. If not, see <http://www.gnu.org/licenses/>. |
| |
| -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- |
| |
| A NOTE FROM THE ORIGINAL AUTHOR |
| |
| Those familiar with the official documentation of the Zilog Z80 CPU will |
| find this source code quite intuitive. The purpose has not been to write |
| the fastest possible emulator, although the speed aspect is not neglected, |
| but a portable, hackable and well- |
| .----._.----. structured piece of software; |
| A11 <-01--|1 o|--40-> A10 something small, solid and elegant |
| A12 <-02--| |--39-> A09 that can stand the test of time |
| A13 <-03--| |--38-> A08 with no need for major changes. |
| A14 <-04--| |--37-> A07 |
| A15 <-05--| |--36-> A06 Some of the main design decisions |
| CLK --06->| |--35-> A05 have been the following: |
| D4 <-07->| |--34-> A04 |
| D3 <-08->|.---------.|--33-> A03 1. Opcode partial decoding keeps |
| D5 <-09->|| ZILOG ||--32-> A02 the code small and maintainable. |
| D6 <-10->|| Z80 ||--31-> A01 |
| +5V --11--|| CPU ||--30-> A00 2. Function pointer tables for |
| D2 <-12->|| ||--29-- GND opcode selection allow easy reuse |
| D7 <-13->|'---------'|--28-> RFSH of almost all instruction code |
| D0 <-14->| |--27-> M1 in the interrupt mode 0. |
| D1 <-15->| |<-26-- RESET |
| INT --16->| |<-25-- BUSREQ 3. Avoiding conditional statements |
| NMI --17->| |<-24-- WAIT as much as possible reduces the |
| HALT <-18--| |--23-> BUSACK branch penalty in modern pipelined |
| MREQ <-19--| |--22-> WR processors. |
| IORQ <-20--| |--21-> RD |
| '-----------' |
| Zilog Z80 CPU, May 1976 version |
| 40-pin ceramic DIP pinout Manuel |
| |
'=============================================================================*/
#ifndef Z80_EXTERNAL_HEADER
# include <Z/constants/pointer.h>
# include <Z/macros/bitwise.h>
# include <Z/macros/structure.h>
#endif
#ifdef Z80_STATIC
# define Z80_API
#else
# define Z80_API Z_API_EXPORT
#endif
#ifdef Z80_WITH_LOCAL_HEADER
# include "Z80.h"
#else
# include <Z80.h>
#endif
/* MARK: - Precomputed Values of AF for `daa` */
#ifdef Z80_WITH_PRECOMPUTED_DAA
# define H(value) Z_UINT16(0x##value)
static zuint16 const daa_af_table[2048] = {
/* HNC */
/* 000 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(0044), H(0100), H(0200), H(0304), H(0400), H(0504), H(0604), H(0700), H(0808), H(090C), H(1010), H(1114), H(1214), H(1310), H(1414), H(1510),
/* 1 */ H(1000), H(1104), H(1204), H(1300), H(1404), H(1500), H(1600), H(1704), H(180C), H(1908), H(2030), H(2134), H(2234), H(2330), H(2434), H(2530),
/* 2 */ H(2020), H(2124), H(2224), H(2320), H(2424), H(2520), H(2620), H(2724), H(282C), H(2928), H(3034), H(3130), H(3230), H(3334), H(3430), H(3534),
/* 3 */ H(3024), H(3120), H(3220), H(3324), H(3420), H(3524), H(3624), H(3720), H(3828), H(392C), H(4010), H(4114), H(4214), H(4310), H(4414), H(4510),
/* 4 */ H(4000), H(4104), H(4204), H(4300), H(4404), H(4500), H(4600), H(4704), H(480C), H(4908), H(5014), H(5110), H(5210), H(5314), H(5410), H(5514),
/* 5 */ H(5004), H(5100), H(5200), H(5304), H(5400), H(5504), H(5604), H(5700), H(5808), H(590C), H(6034), H(6130), H(6230), H(6334), H(6430), H(6534),
/* 6 */ H(6024), H(6120), H(6220), H(6324), H(6420), H(6524), H(6624), H(6720), H(6828), H(692C), H(7030), H(7134), H(7234), H(7330), H(7434), H(7530),
/* 7 */ H(7020), H(7124), H(7224), H(7320), H(7424), H(7520), H(7620), H(7724), H(782C), H(7928), H(8090), H(8194), H(8294), H(8390), H(8494), H(8590),
/* 8 */ H(8080), H(8184), H(8284), H(8380), H(8484), H(8580), H(8680), H(8784), H(888C), H(8988), H(9094), H(9190), H(9290), H(9394), H(9490), H(9594),
/* 9 */ H(9084), H(9180), H(9280), H(9384), H(9480), H(9584), H(9684), H(9780), H(9888), H(998C), H(0055), H(0111), H(0211), H(0315), H(0411), H(0515),
/* A */ H(0045), H(0101), H(0201), H(0305), H(0401), H(0505), H(0605), H(0701), H(0809), H(090D), H(1011), H(1115), H(1215), H(1311), H(1415), H(1511),
/* B */ H(1001), H(1105), H(1205), H(1301), H(1405), H(1501), H(1601), H(1705), H(180D), H(1909), H(2031), H(2135), H(2235), H(2331), H(2435), H(2531),
/* C */ H(2021), H(2125), H(2225), H(2321), H(2425), H(2521), H(2621), H(2725), H(282D), H(2929), H(3035), H(3131), H(3231), H(3335), H(3431), H(3535),
/* D */ H(3025), H(3121), H(3221), H(3325), H(3421), H(3525), H(3625), H(3721), H(3829), H(392D), H(4011), H(4115), H(4215), H(4311), H(4415), H(4511),
/* E */ H(4001), H(4105), H(4205), H(4301), H(4405), H(4501), H(4601), H(4705), H(480D), H(4909), H(5015), H(5111), H(5211), H(5315), H(5411), H(5515),
/* F */ H(5005), H(5101), H(5201), H(5305), H(5401), H(5505), H(5605), H(5701), H(5809), H(590D), H(6035), H(6131), H(6231), H(6335), H(6431), H(6535),
/* HNC */
/* 001 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(6025), H(6121), H(6221), H(6325), H(6421), H(6525), H(6625), H(6721), H(6829), H(692D), H(7031), H(7135), H(7235), H(7331), H(7435), H(7531),
/* 1 */ H(7021), H(7125), H(7225), H(7321), H(7425), H(7521), H(7621), H(7725), H(782D), H(7929), H(8091), H(8195), H(8295), H(8391), H(8495), H(8591),
/* 2 */ H(8081), H(8185), H(8285), H(8381), H(8485), H(8581), H(8681), H(8785), H(888D), H(8989), H(9095), H(9191), H(9291), H(9395), H(9491), H(9595),
/* 3 */ H(9085), H(9181), H(9281), H(9385), H(9481), H(9585), H(9685), H(9781), H(9889), H(998D), H(A0B5), H(A1B1), H(A2B1), H(A3B5), H(A4B1), H(A5B5),
/* 4 */ H(A0A5), H(A1A1), H(A2A1), H(A3A5), H(A4A1), H(A5A5), H(A6A5), H(A7A1), H(A8A9), H(A9AD), H(B0B1), H(B1B5), H(B2B5), H(B3B1), H(B4B5), H(B5B1),
/* 5 */ H(B0A1), H(B1A5), H(B2A5), H(B3A1), H(B4A5), H(B5A1), H(B6A1), H(B7A5), H(B8AD), H(B9A9), H(C095), H(C191), H(C291), H(C395), H(C491), H(C595),
/* 6 */ H(C085), H(C181), H(C281), H(C385), H(C481), H(C585), H(C685), H(C781), H(C889), H(C98D), H(D091), H(D195), H(D295), H(D391), H(D495), H(D591),
/* 7 */ H(D081), H(D185), H(D285), H(D381), H(D485), H(D581), H(D681), H(D785), H(D88D), H(D989), H(E0B1), H(E1B5), H(E2B5), H(E3B1), H(E4B5), H(E5B1),
/* 8 */ H(E0A1), H(E1A5), H(E2A5), H(E3A1), H(E4A5), H(E5A1), H(E6A1), H(E7A5), H(E8AD), H(E9A9), H(F0B5), H(F1B1), H(F2B1), H(F3B5), H(F4B1), H(F5B5),
/* 9 */ H(F0A5), H(F1A1), H(F2A1), H(F3A5), H(F4A1), H(F5A5), H(F6A5), H(F7A1), H(F8A9), H(F9AD), H(0055), H(0111), H(0211), H(0315), H(0411), H(0515),
/* A */ H(0045), H(0101), H(0201), H(0305), H(0401), H(0505), H(0605), H(0701), H(0809), H(090D), H(1011), H(1115), H(1215), H(1311), H(1415), H(1511),
/* B */ H(1001), H(1105), H(1205), H(1301), H(1405), H(1501), H(1601), H(1705), H(180D), H(1909), H(2031), H(2135), H(2235), H(2331), H(2435), H(2531),
/* C */ H(2021), H(2125), H(2225), H(2321), H(2425), H(2521), H(2621), H(2725), H(282D), H(2929), H(3035), H(3131), H(3231), H(3335), H(3431), H(3535),
/* D */ H(3025), H(3121), H(3221), H(3325), H(3421), H(3525), H(3625), H(3721), H(3829), H(392D), H(4011), H(4115), H(4215), H(4311), H(4415), H(4511),
/* E */ H(4001), H(4105), H(4205), H(4301), H(4405), H(4501), H(4601), H(4705), H(480D), H(4909), H(5015), H(5111), H(5211), H(5315), H(5411), H(5515),
/* F */ H(5005), H(5101), H(5201), H(5305), H(5401), H(5505), H(5605), H(5701), H(5809), H(590D), H(6035), H(6131), H(6231), H(6335), H(6431), H(6535),
/* HNC */
/* 010 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(0046), H(0102), H(0202), H(0306), H(0402), H(0506), H(0606), H(0702), H(080A), H(090E), H(0402), H(0506), H(0606), H(0702), H(080A), H(090E),
/* 1 */ H(1002), H(1106), H(1206), H(1302), H(1406), H(1502), H(1602), H(1706), H(180E), H(190A), H(1406), H(1502), H(1602), H(1706), H(180E), H(190A),
/* 2 */ H(2022), H(2126), H(2226), H(2322), H(2426), H(2522), H(2622), H(2726), H(282E), H(292A), H(2426), H(2522), H(2622), H(2726), H(282E), H(292A),
/* 3 */ H(3026), H(3122), H(3222), H(3326), H(3422), H(3526), H(3626), H(3722), H(382A), H(392E), H(3422), H(3526), H(3626), H(3722), H(382A), H(392E),
/* 4 */ H(4002), H(4106), H(4206), H(4302), H(4406), H(4502), H(4602), H(4706), H(480E), H(490A), H(4406), H(4502), H(4602), H(4706), H(480E), H(490A),
/* 5 */ H(5006), H(5102), H(5202), H(5306), H(5402), H(5506), H(5606), H(5702), H(580A), H(590E), H(5402), H(5506), H(5606), H(5702), H(580A), H(590E),
/* 6 */ H(6026), H(6122), H(6222), H(6326), H(6422), H(6526), H(6626), H(6722), H(682A), H(692E), H(6422), H(6526), H(6626), H(6722), H(682A), H(692E),
/* 7 */ H(7022), H(7126), H(7226), H(7322), H(7426), H(7522), H(7622), H(7726), H(782E), H(792A), H(7426), H(7522), H(7622), H(7726), H(782E), H(792A),
/* 8 */ H(8082), H(8186), H(8286), H(8382), H(8486), H(8582), H(8682), H(8786), H(888E), H(898A), H(8486), H(8582), H(8682), H(8786), H(888E), H(898A),
/* 9 */ H(9086), H(9182), H(9282), H(9386), H(9482), H(9586), H(9686), H(9782), H(988A), H(998E), H(3423), H(3527), H(3627), H(3723), H(382B), H(392F),
/* A */ H(4003), H(4107), H(4207), H(4303), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B),
/* B */ H(5007), H(5103), H(5203), H(5307), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F),
/* C */ H(6027), H(6123), H(6223), H(6327), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F),
/* D */ H(7023), H(7127), H(7227), H(7323), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B),
/* E */ H(8083), H(8187), H(8287), H(8383), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B),
/* F */ H(9087), H(9183), H(9283), H(9387), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F),
/* HNC */
/* 011 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(A0A7), H(A1A3), H(A2A3), H(A3A7), H(A4A3), H(A5A7), H(A6A7), H(A7A3), H(A8AB), H(A9AF), H(A4A3), H(A5A7), H(A6A7), H(A7A3), H(A8AB), H(A9AF),
/* 1 */ H(B0A3), H(B1A7), H(B2A7), H(B3A3), H(B4A7), H(B5A3), H(B6A3), H(B7A7), H(B8AF), H(B9AB), H(B4A7), H(B5A3), H(B6A3), H(B7A7), H(B8AF), H(B9AB),
/* 2 */ H(C087), H(C183), H(C283), H(C387), H(C483), H(C587), H(C687), H(C783), H(C88B), H(C98F), H(C483), H(C587), H(C687), H(C783), H(C88B), H(C98F),
/* 3 */ H(D083), H(D187), H(D287), H(D383), H(D487), H(D583), H(D683), H(D787), H(D88F), H(D98B), H(D487), H(D583), H(D683), H(D787), H(D88F), H(D98B),
/* 4 */ H(E0A3), H(E1A7), H(E2A7), H(E3A3), H(E4A7), H(E5A3), H(E6A3), H(E7A7), H(E8AF), H(E9AB), H(E4A7), H(E5A3), H(E6A3), H(E7A7), H(E8AF), H(E9AB),
/* 5 */ H(F0A7), H(F1A3), H(F2A3), H(F3A7), H(F4A3), H(F5A7), H(F6A7), H(F7A3), H(F8AB), H(F9AF), H(F4A3), H(F5A7), H(F6A7), H(F7A3), H(F8AB), H(F9AF),
/* 6 */ H(0047), H(0103), H(0203), H(0307), H(0403), H(0507), H(0607), H(0703), H(080B), H(090F), H(0403), H(0507), H(0607), H(0703), H(080B), H(090F),
/* 7 */ H(1003), H(1107), H(1207), H(1303), H(1407), H(1503), H(1603), H(1707), H(180F), H(190B), H(1407), H(1503), H(1603), H(1707), H(180F), H(190B),
/* 8 */ H(2023), H(2127), H(2227), H(2323), H(2427), H(2523), H(2623), H(2727), H(282F), H(292B), H(2427), H(2523), H(2623), H(2727), H(282F), H(292B),
/* 9 */ H(3027), H(3123), H(3223), H(3327), H(3423), H(3527), H(3627), H(3723), H(382B), H(392F), H(3423), H(3527), H(3627), H(3723), H(382B), H(392F),
/* A */ H(4003), H(4107), H(4207), H(4303), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B),
/* B */ H(5007), H(5103), H(5203), H(5307), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F),
/* C */ H(6027), H(6123), H(6223), H(6327), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F),
/* D */ H(7023), H(7127), H(7227), H(7323), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B),
/* E */ H(8083), H(8187), H(8287), H(8383), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B),
/* F */ H(9087), H(9183), H(9283), H(9387), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F),
/* HNC */
/* 100 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(0604), H(0700), H(0808), H(090C), H(0A0C), H(0B08), H(0C0C), H(0D08), H(0E08), H(0F0C), H(1010), H(1114), H(1214), H(1310), H(1414), H(1510),
/* 1 */ H(1600), H(1704), H(180C), H(1908), H(1A08), H(1B0C), H(1C08), H(1D0C), H(1E0C), H(1F08), H(2030), H(2134), H(2234), H(2330), H(2434), H(2530),
/* 2 */ H(2620), H(2724), H(282C), H(2928), H(2A28), H(2B2C), H(2C28), H(2D2C), H(2E2C), H(2F28), H(3034), H(3130), H(3230), H(3334), H(3430), H(3534),
/* 3 */ H(3624), H(3720), H(3828), H(392C), H(3A2C), H(3B28), H(3C2C), H(3D28), H(3E28), H(3F2C), H(4010), H(4114), H(4214), H(4310), H(4414), H(4510),
/* 4 */ H(4600), H(4704), H(480C), H(4908), H(4A08), H(4B0C), H(4C08), H(4D0C), H(4E0C), H(4F08), H(5014), H(5110), H(5210), H(5314), H(5410), H(5514),
/* 5 */ H(5604), H(5700), H(5808), H(590C), H(5A0C), H(5B08), H(5C0C), H(5D08), H(5E08), H(5F0C), H(6034), H(6130), H(6230), H(6334), H(6430), H(6534),
/* 6 */ H(6624), H(6720), H(6828), H(692C), H(6A2C), H(6B28), H(6C2C), H(6D28), H(6E28), H(6F2C), H(7030), H(7134), H(7234), H(7330), H(7434), H(7530),
/* 7 */ H(7620), H(7724), H(782C), H(7928), H(7A28), H(7B2C), H(7C28), H(7D2C), H(7E2C), H(7F28), H(8090), H(8194), H(8294), H(8390), H(8494), H(8590),
/* 8 */ H(8680), H(8784), H(888C), H(8988), H(8A88), H(8B8C), H(8C88), H(8D8C), H(8E8C), H(8F88), H(9094), H(9190), H(9290), H(9394), H(9490), H(9594),
/* 9 */ H(9684), H(9780), H(9888), H(998C), H(9A8C), H(9B88), H(9C8C), H(9D88), H(9E88), H(9F8C), H(0055), H(0111), H(0211), H(0315), H(0411), H(0515),
/* A */ H(0605), H(0701), H(0809), H(090D), H(0A0D), H(0B09), H(0C0D), H(0D09), H(0E09), H(0F0D), H(1011), H(1115), H(1215), H(1311), H(1415), H(1511),
/* B */ H(1601), H(1705), H(180D), H(1909), H(1A09), H(1B0D), H(1C09), H(1D0D), H(1E0D), H(1F09), H(2031), H(2135), H(2235), H(2331), H(2435), H(2531),
/* C */ H(2621), H(2725), H(282D), H(2929), H(2A29), H(2B2D), H(2C29), H(2D2D), H(2E2D), H(2F29), H(3035), H(3131), H(3231), H(3335), H(3431), H(3535),
/* D */ H(3625), H(3721), H(3829), H(392D), H(3A2D), H(3B29), H(3C2D), H(3D29), H(3E29), H(3F2D), H(4011), H(4115), H(4215), H(4311), H(4415), H(4511),
/* E */ H(4601), H(4705), H(480D), H(4909), H(4A09), H(4B0D), H(4C09), H(4D0D), H(4E0D), H(4F09), H(5015), H(5111), H(5211), H(5315), H(5411), H(5515),
/* F */ H(5605), H(5701), H(5809), H(590D), H(5A0D), H(5B09), H(5C0D), H(5D09), H(5E09), H(5F0D), H(6035), H(6131), H(6231), H(6335), H(6431), H(6535),
/* HNC */
/* 101 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(6625), H(6721), H(6829), H(692D), H(6A2D), H(6B29), H(6C2D), H(6D29), H(6E29), H(6F2D), H(7031), H(7135), H(7235), H(7331), H(7435), H(7531),
/* 1 */ H(7621), H(7725), H(782D), H(7929), H(7A29), H(7B2D), H(7C29), H(7D2D), H(7E2D), H(7F29), H(8091), H(8195), H(8295), H(8391), H(8495), H(8591),
/* 2 */ H(8681), H(8785), H(888D), H(8989), H(8A89), H(8B8D), H(8C89), H(8D8D), H(8E8D), H(8F89), H(9095), H(9191), H(9291), H(9395), H(9491), H(9595),
/* 3 */ H(9685), H(9781), H(9889), H(998D), H(9A8D), H(9B89), H(9C8D), H(9D89), H(9E89), H(9F8D), H(A0B5), H(A1B1), H(A2B1), H(A3B5), H(A4B1), H(A5B5),
/* 4 */ H(A6A5), H(A7A1), H(A8A9), H(A9AD), H(AAAD), H(ABA9), H(ACAD), H(ADA9), H(AEA9), H(AFAD), H(B0B1), H(B1B5), H(B2B5), H(B3B1), H(B4B5), H(B5B1),
/* 5 */ H(B6A1), H(B7A5), H(B8AD), H(B9A9), H(BAA9), H(BBAD), H(BCA9), H(BDAD), H(BEAD), H(BFA9), H(C095), H(C191), H(C291), H(C395), H(C491), H(C595),
/* 6 */ H(C685), H(C781), H(C889), H(C98D), H(CA8D), H(CB89), H(CC8D), H(CD89), H(CE89), H(CF8D), H(D091), H(D195), H(D295), H(D391), H(D495), H(D591),
/* 7 */ H(D681), H(D785), H(D88D), H(D989), H(DA89), H(DB8D), H(DC89), H(DD8D), H(DE8D), H(DF89), H(E0B1), H(E1B5), H(E2B5), H(E3B1), H(E4B5), H(E5B1),
/* 8 */ H(E6A1), H(E7A5), H(E8AD), H(E9A9), H(EAA9), H(EBAD), H(ECA9), H(EDAD), H(EEAD), H(EFA9), H(F0B5), H(F1B1), H(F2B1), H(F3B5), H(F4B1), H(F5B5),
/* 9 */ H(F6A5), H(F7A1), H(F8A9), H(F9AD), H(FAAD), H(FBA9), H(FCAD), H(FDA9), H(FEA9), H(FFAD), H(0055), H(0111), H(0211), H(0315), H(0411), H(0515),
/* A */ H(0605), H(0701), H(0809), H(090D), H(0A0D), H(0B09), H(0C0D), H(0D09), H(0E09), H(0F0D), H(1011), H(1115), H(1215), H(1311), H(1415), H(1511),
/* B */ H(1601), H(1705), H(180D), H(1909), H(1A09), H(1B0D), H(1C09), H(1D0D), H(1E0D), H(1F09), H(2031), H(2135), H(2235), H(2331), H(2435), H(2531),
/* C */ H(2621), H(2725), H(282D), H(2929), H(2A29), H(2B2D), H(2C29), H(2D2D), H(2E2D), H(2F29), H(3035), H(3131), H(3231), H(3335), H(3431), H(3535),
/* D */ H(3625), H(3721), H(3829), H(392D), H(3A2D), H(3B29), H(3C2D), H(3D29), H(3E29), H(3F2D), H(4011), H(4115), H(4215), H(4311), H(4415), H(4511),
/* E */ H(4601), H(4705), H(480D), H(4909), H(4A09), H(4B0D), H(4C09), H(4D0D), H(4E0D), H(4F09), H(5015), H(5111), H(5211), H(5315), H(5411), H(5515),
/* F */ H(5605), H(5701), H(5809), H(590D), H(5A0D), H(5B09), H(5C0D), H(5D09), H(5E09), H(5F0D), H(6035), H(6131), H(6231), H(6335), H(6431), H(6535),
/* HNC */
/* 110 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(FABE), H(FBBA), H(FCBE), H(FDBA), H(FEBA), H(FFBE), H(0046), H(0102), H(0202), H(0306), H(0402), H(0506), H(0606), H(0702), H(080A), H(090E),
/* 1 */ H(0A1E), H(0B1A), H(0C1E), H(0D1A), H(0E1A), H(0F1E), H(1002), H(1106), H(1206), H(1302), H(1406), H(1502), H(1602), H(1706), H(180E), H(190A),
/* 2 */ H(1A1A), H(1B1E), H(1C1A), H(1D1E), H(1E1E), H(1F1A), H(2022), H(2126), H(2226), H(2322), H(2426), H(2522), H(2622), H(2726), H(282E), H(292A),
/* 3 */ H(2A3A), H(2B3E), H(2C3A), H(2D3E), H(2E3E), H(2F3A), H(3026), H(3122), H(3222), H(3326), H(3422), H(3526), H(3626), H(3722), H(382A), H(392E),
/* 4 */ H(3A3E), H(3B3A), H(3C3E), H(3D3A), H(3E3A), H(3F3E), H(4002), H(4106), H(4206), H(4302), H(4406), H(4502), H(4602), H(4706), H(480E), H(490A),
/* 5 */ H(4A1A), H(4B1E), H(4C1A), H(4D1E), H(4E1E), H(4F1A), H(5006), H(5102), H(5202), H(5306), H(5402), H(5506), H(5606), H(5702), H(580A), H(590E),
/* 6 */ H(5A1E), H(5B1A), H(5C1E), H(5D1A), H(5E1A), H(5F1E), H(6026), H(6122), H(6222), H(6326), H(6422), H(6526), H(6626), H(6722), H(682A), H(692E),
/* 7 */ H(6A3E), H(6B3A), H(6C3E), H(6D3A), H(6E3A), H(6F3E), H(7022), H(7126), H(7226), H(7322), H(7426), H(7522), H(7622), H(7726), H(782E), H(792A),
/* 8 */ H(7A3A), H(7B3E), H(7C3A), H(7D3E), H(7E3E), H(7F3A), H(8082), H(8186), H(8286), H(8382), H(8486), H(8582), H(8682), H(8786), H(888E), H(898A),
/* 9 */ H(8A9A), H(8B9E), H(8C9A), H(8D9E), H(8E9E), H(8F9A), H(9086), H(9182), H(9282), H(9386), H(3423), H(3527), H(3627), H(3723), H(382B), H(392F),
/* A */ H(3A3F), H(3B3B), H(3C3F), H(3D3B), H(3E3B), H(3F3F), H(4003), H(4107), H(4207), H(4303), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B),
/* B */ H(4A1B), H(4B1F), H(4C1B), H(4D1F), H(4E1F), H(4F1B), H(5007), H(5103), H(5203), H(5307), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F),
/* C */ H(5A1F), H(5B1B), H(5C1F), H(5D1B), H(5E1B), H(5F1F), H(6027), H(6123), H(6223), H(6327), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F),
/* D */ H(6A3F), H(6B3B), H(6C3F), H(6D3B), H(6E3B), H(6F3F), H(7023), H(7127), H(7227), H(7323), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B),
/* E */ H(7A3B), H(7B3F), H(7C3B), H(7D3F), H(7E3F), H(7F3B), H(8083), H(8187), H(8287), H(8383), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B),
/* F */ H(8A9B), H(8B9F), H(8C9B), H(8D9F), H(8E9F), H(8F9B), H(9087), H(9183), H(9283), H(9387), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F),
/* HNC */
/* 111 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ H(9A9F), H(9B9B), H(9C9F), H(9D9B), H(9E9B), H(9F9F), H(A0A7), H(A1A3), H(A2A3), H(A3A7), H(A4A3), H(A5A7), H(A6A7), H(A7A3), H(A8AB), H(A9AF),
/* 1 */ H(AABF), H(ABBB), H(ACBF), H(ADBB), H(AEBB), H(AFBF), H(B0A3), H(B1A7), H(B2A7), H(B3A3), H(B4A7), H(B5A3), H(B6A3), H(B7A7), H(B8AF), H(B9AB),
/* 2 */ H(BABB), H(BBBF), H(BCBB), H(BDBF), H(BEBF), H(BFBB), H(C087), H(C183), H(C283), H(C387), H(C483), H(C587), H(C687), H(C783), H(C88B), H(C98F),
/* 3 */ H(CA9F), H(CB9B), H(CC9F), H(CD9B), H(CE9B), H(CF9F), H(D083), H(D187), H(D287), H(D383), H(D487), H(D583), H(D683), H(D787), H(D88F), H(D98B),
/* 4 */ H(DA9B), H(DB9F), H(DC9B), H(DD9F), H(DE9F), H(DF9B), H(E0A3), H(E1A7), H(E2A7), H(E3A3), H(E4A7), H(E5A3), H(E6A3), H(E7A7), H(E8AF), H(E9AB),
/* 5 */ H(EABB), H(EBBF), H(ECBB), H(EDBF), H(EEBF), H(EFBB), H(F0A7), H(F1A3), H(F2A3), H(F3A7), H(F4A3), H(F5A7), H(F6A7), H(F7A3), H(F8AB), H(F9AF),
/* 6 */ H(FABF), H(FBBB), H(FCBF), H(FDBB), H(FEBB), H(FFBF), H(0047), H(0103), H(0203), H(0307), H(0403), H(0507), H(0607), H(0703), H(080B), H(090F),
/* 7 */ H(0A1F), H(0B1B), H(0C1F), H(0D1B), H(0E1B), H(0F1F), H(1003), H(1107), H(1207), H(1303), H(1407), H(1503), H(1603), H(1707), H(180F), H(190B),
/* 8 */ H(1A1B), H(1B1F), H(1C1B), H(1D1F), H(1E1F), H(1F1B), H(2023), H(2127), H(2227), H(2323), H(2427), H(2523), H(2623), H(2727), H(282F), H(292B),
/* 9 */ H(2A3B), H(2B3F), H(2C3B), H(2D3F), H(2E3F), H(2F3B), H(3027), H(3123), H(3223), H(3327), H(3423), H(3527), H(3627), H(3723), H(382B), H(392F),
/* A */ H(3A3F), H(3B3B), H(3C3F), H(3D3B), H(3E3B), H(3F3F), H(4003), H(4107), H(4207), H(4303), H(4407), H(4503), H(4603), H(4707), H(480F), H(490B),
/* B */ H(4A1B), H(4B1F), H(4C1B), H(4D1F), H(4E1F), H(4F1B), H(5007), H(5103), H(5203), H(5307), H(5403), H(5507), H(5607), H(5703), H(580B), H(590F),
/* C */ H(5A1F), H(5B1B), H(5C1F), H(5D1B), H(5E1B), H(5F1F), H(6027), H(6123), H(6223), H(6327), H(6423), H(6527), H(6627), H(6723), H(682B), H(692F),
/* D */ H(6A3F), H(6B3B), H(6C3F), H(6D3B), H(6E3B), H(6F3F), H(7023), H(7127), H(7227), H(7323), H(7427), H(7523), H(7623), H(7727), H(782F), H(792B),
/* E */ H(7A3B), H(7B3F), H(7C3B), H(7D3F), H(7E3F), H(7F3B), H(8083), H(8187), H(8287), H(8383), H(8487), H(8583), H(8683), H(8787), H(888F), H(898B),
/* F */ H(8A9B), H(8B9F), H(8C9B), H(8D9F), H(8E9F), H(8F9B), H(9087), H(9183), H(9283), H(9387), H(9483), H(9587), H(9687), H(9783), H(988B), H(998F)};
# undef H
#endif
/* MARK: - Types */
typedef zuint8 (* Insn)(Z80 *self);
#ifdef Z80_WITH_FULL_IM0
typedef struct {
Z80* z80;
void* context;
Z80Read fetch;
Z80Read read;
Z80Write write;
Z80Read in;
Z80Write out;
Z80Notify ld_i_a;
Z80Notify ld_r_a;
Z80Notify reti;
Z80Notify retn;
zuint16 pc;
} IM0;
#endif
/* MARK: - Instance Variable and Callback Shortcuts */
#define MEMPTR self->memptr.uint16_value
#define PC self->pc.uint16_value
#define SP self->sp.uint16_value
#define XY self->xy.uint16_value
#define IX self->ix_iy[0].uint16_value
#define IY self->ix_iy[1].uint16_value
#define AF self->af.uint16_value
#define BC self->bc.uint16_value
#define DE self->de.uint16_value
#define HL self->hl.uint16_value
#define AF_ self->af_.uint16_value
#define BC_ self->bc_.uint16_value
#define DE_ self->de_.uint16_value
#define HL_ self->hl_.uint16_value
#define MEMPTRH self->memptr.uint8_values.at_1
#define MEMPTRL self->memptr.uint8_values.at_0
#define PCH self->pc.uint8_values.at_1
#define A self->af.uint8_values.at_1
#define F self->af.uint8_values.at_0
#define B self->bc.uint8_values.at_1
#define C self->bc.uint8_values.at_0
#define E self->de.uint8_values.at_0
#define L self->hl.uint8_values.at_0
#define I self->i
#define R self->r
#define R7 self->r7
#define Q self->q
#define IFF1 self->iff1
#define IFF2 self->iff2
#define IM self->im
#define HALT_LINE self->halt_line
#define INT_LINE self->int_line
#define DATA self->data.uint8_array
#define REQUEST self->request
#define RESUME self->resume
#define OPTIONS self->options
#define CONTEXT self->context
#define FETCH_OPCODE(address) self->fetch_opcode(CONTEXT, address)
#define FETCH(address) self->fetch (CONTEXT, address)
#define READ(address) self->read (CONTEXT, address)
#define WRITE(address, value) self->write (CONTEXT, address, value)
#define IN(port) self->in (CONTEXT, port)
#define OUT(port, value) self->out (CONTEXT, port, value)
#define NOTIFY(callback) if (self->callback != Z_NULL) self->callback(CONTEXT)
/* MARK: - 16-bit Callback Operations */
static Z_ALWAYS_INLINE zuint16 fetch_16(Z80 *self, zuint16 address)
{
zuint8 l = FETCH(address);
return (zuint16)(l | ((zuint16)FETCH(address + 1) << 8));
}
static Z_ALWAYS_INLINE zuint16 read_16(Z80 *self, zuint16 address)
{
zuint8 l = READ(address);
return (zuint16)(l | ((zuint16)READ(address + 1) << 8));
}
static Z_ALWAYS_INLINE void write_16f(Z80 *self, zuint16 address, zuint16 value)
{
WRITE(address, (zuint8)value);
WRITE(address + 1, (zuint8)(value >> 8));
}
static Z_ALWAYS_INLINE void write_16b(Z80 *self, zuint16 address, zuint16 value)
{
WRITE(address + 1, (zuint8)(value >> 8));
WRITE(address, (zuint8)value);
}
#ifndef Z80_WITH_FULL_IM0
static Z_ALWAYS_INLINE zuint16 int_fetch_16(Z80 *self)
{
zuint8 l = self->int_fetch(CONTEXT, PC);
return (zuint16)(l | ((zuint16)self->int_fetch(CONTEXT, PC) << 8));
}
#endif
#define FETCH_16(address) fetch_16 (self, address)
#define READ_16(address) read_16 (self, address)
#define WRITE_16F(address, value) write_16f(self, address, value)
#define WRITE_16B(address, value) write_16b(self, address, value)
/* MARK: - Interrupt Mode 0: Callback Trampolines */
#ifdef Z80_WITH_FULL_IM0
static zuint8 im0_fetch(IM0 const *self, zuint16 address)
{
Z_UNUSED(address)
return self->z80->int_fetch(CONTEXT, self->pc);
}
static zuint8 im0_read(IM0 const *self, zuint16 address)
{return READ(address);}
static void im0_write(IM0 const *self, zuint16 address, zuint8 value)
{WRITE(address, value);}
static zuint8 im0_in(IM0 const *self, zuint16 port)
{return IN(port);}
static void im0_out(IM0 const *self, zuint16 port, zuint8 value)
{OUT(port, value);}
static void im0_ld_i_a(IM0 const *self) {NOTIFY(ld_i_a);}
static void im0_ld_r_a(IM0 const *self) {NOTIFY(ld_r_a);}
# ifdef Z80_WITH_IM0_RETX_NOTIFICATIONS
#define IM0_NOTIFY_RETX(callback) \
if ( self->callback != Z_NULL && \
(self->z80->options & \
Z80_OPTION_IM0_RETX_NOTIFICATIONS) \
) \
{ \
self->z80->data.uint8_array[2] |= 2; \
self->callback(CONTEXT); \
}
static void im0_reti(IM0 const *self) {IM0_NOTIFY_RETX(reti)}
static void im0_retn(IM0 const *self) {IM0_NOTIFY_RETX(retn)}
# endif
#endif
/* MARK: - Interrupt Mode 0: PC Decrements for Unprefixed Instructions */
#ifdef Z80_WITH_FULL_IM0
static zuint8 const im0_pc_decrement_table[256] = {
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 1 */ 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
/* 2 */ 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
/* 3 */ 2, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0,
/* 4 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 5 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 6 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 7 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 8 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* 9 */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* A */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* B */ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
/* C */ 1, 0, 3, 3, 3, 0, 0, 1, 1, 1, 3, 0, 3, 3, 0, 1,
/* D */ 1, 0, 3, 0, 3, 0, 0, 1, 1, 0, 3, 0, 3, 0, 0, 1,
/* E */ 1, 0, 3, 0, 3, 0, 0, 1, 1, 1, 3, 0, 3, 0, 0, 1,
/* F */ 1, 0, 3, 0, 3, 0, 0, 1, 1, 0, 3, 0, 3, 0, 0, 1};
#endif
/* MARK: - Flags */
/*----------------.
| 7 6 5 4 3 2 1 0 |
| S Z Y H X P N C |
'-|-|-|-|-|-|-|-|-'
| | | | | | | '-- carry / borrow
| | | | | | '---- addition / subtraction
| | | | | '------ parity (P) / two's complement signed overflow (V)
| | | | '-------- result's bit 3 (undocumented)
| | | '---------- half carry / half borrow
| | '------------ result's bit 5 (undocumented)
| '-------------- zero
'---------------- sign */
#define SF 128
#define ZF 64
#define YF 32
#define HF 16
#define XF 8
#define PF 4
#define NF 2
#define CF 1
#define SZPCF (SF | ZF | PF | CF)
#define SZPF (SF | ZF | PF )
#define SZCF (SF | ZF | CF )
#define SYXF (SF | YF | XF )
#define ZPF (ZF | PF )
#define YXCF (YF | XF | CF )
#define YXF (YF | XF )
#define HCF (HF | CF )
#define F_SZPC (F & SZPCF)
#define F_SZP (F & SZPF)
#define F_SZC (F & SZCF)
#define F_C (F & CF)
#define A_SYX (A & SYXF)
#define A_YX (A & YXF)
#define ZF_ZERO(value) (!(value) << 6)
#ifdef Z80_WITH_PARITY_COMPUTATION
static Z_ALWAYS_INLINE zuint8 pf_parity(zuint8 value)
{return (zuint8)(((0x9669U >> ((value ^ (value >> 4)) & 0xF)) & 1) << 2);}
# define PF_PARITY pf_parity
#else
static zuint8 const pf_parity_table[256] = {
/* 0 1 2 3 4 5 6 7 8 9 A B C D E F */
/* 0 */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* 1 */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* 2 */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* 3 */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* 4 */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* 5 */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* 6 */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* 7 */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* 8 */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* 9 */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* A */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* B */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* C */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4,
/* D */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* E */ 0, 4, 4, 0, 4, 0, 0, 4, 4, 0, 0, 4, 0, 4, 4, 0,
/* F */ 4, 0, 0, 4, 0, 4, 4, 0, 0, 4, 4, 0, 4, 0, 0, 4};
# define PF_PARITY(value) pf_parity_table[value]
#endif
/*-----------------------------------------------------------------------------.
| `PF_OVERFLOW` computes PF according to whether signed overflow occurs in the |
| addition or subtraction of two integers. For additions, `rhs` must be passed |
| bit-wise ~inverted. For an explanation of the formula, check: |
| * https://stackoverflow.com/a/199668 |
| * http://www.cs.umd.edu/class/spring2003/cmsc311/Notes/Comb/overflow.html |
'=============================================================================*/
#define PF_OVERFLOW(width, result, lhs, rhs) \
(((zuint##width)((lhs ^ rhs) & (lhs ^ result)) >> (width - 3)) & PF)
/*-----------------------------------------------------------------------------.
| Q serves as an abstraction for a set of latches related to flag computation. |
| From an emulation perspective, instructions that affect the flags copy the |
| final value of F to Q, whereas instructions that do not affect the flags |
| (including `ex af,af'`, `pop af`, internal NOPs and interrupt responses) set |
| Q to 0. Q is used to compute YF and XF in the `ccf` and `scf` instructions. |
| |
| References: |
| * https://worldofspectrum.org/forums/discussion/20345 |
| * https://worldofspectrum.org/forums/discussion/41704 |
'=============================================================================*/
#ifdef Z80_WITH_Q
# define FLAGS Q = F
# define Q_0 Q = 0;
#else
# define FLAGS F
# define Q_0
#endif
/* MARK: - Bit Rotation */
#define ROL(value) Z_UINT8_ROTATE_LEFT (value, 1)
#define ROR(value) Z_UINT8_ROTATE_RIGHT(value, 1)
/* MARK: - 8-Bit Register Resolution */
/*---------. .---------------------.
| 76543210 | | J / K | O / P |
|----------| |---------+-----------|
| __jjj___ | | 000 = b | 000 = b |
| _____kkk | | 001 = c | 001 = c |
| __ooo___ | | 010 = d | 010 = d |
| _____ppp | | 011 = e | 011 = e |
'----------' | 100 = h | 100 = XYh |
| 101 = l | 101 = XYl |
| 111 = a | 111 = a |
'--------------------*/
static zusize const j_k_table[8] = {
Z_MEMBER_OFFSET(Z80, bc.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, bc.uint8_values.at_0),
Z_MEMBER_OFFSET(Z80, de.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, de.uint8_values.at_0),
Z_MEMBER_OFFSET(Z80, hl.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, hl.uint8_values.at_0),
0,
Z_MEMBER_OFFSET(Z80, af.uint8_values.at_1)};
static zusize const o_p_table[8] = {
Z_MEMBER_OFFSET(Z80, bc.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, bc.uint8_values.at_0),
Z_MEMBER_OFFSET(Z80, de.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, de.uint8_values.at_0),
Z_MEMBER_OFFSET(Z80, xy.uint8_values.at_1),
Z_MEMBER_OFFSET(Z80, xy.uint8_values.at_0),
0,
Z_MEMBER_OFFSET(Z80, af.uint8_values.at_1)};
#define REGISTER_8(table, offset, shift) \
*((zuint8 *)self + table[(DATA[offset] shift) & 7])
#define J0 REGISTER_8(j_k_table, 0, >> 3 )
#define J1 REGISTER_8(j_k_table, 1, >> 3 )
#define K0 REGISTER_8(j_k_table, 0, Z_EMPTY)
#define K1 REGISTER_8(j_k_table, 1, Z_EMPTY)
#define K3 REGISTER_8(j_k_table, 3, Z_EMPTY)
#define O REGISTER_8(o_p_table, 1, >> 3 )
#define P REGISTER_8(o_p_table, 1, Z_EMPTY)
/* MARK: - 16-Bit Register Resolution */
/*---------. .-----------------------------.
| 76543210 | | S | T | W |
|----------| |---------+---------+---------|
| __ss____ | | 00 = bc | 00 = bc | 00 = bc |
| __tt____ | | 01 = de | 01 = de | 01 = de |
| __ww____ | | 10 = hl | 10 = hl | 10 = XY |
'----------' | 11 = sp | 11 = af | 11 = sp |
'----------------------------*/
static zusize const s_table[4] = {
Z_MEMBER_OFFSET(Z80, bc.uint16_value),
Z_MEMBER_OFFSET(Z80, de.uint16_value),
Z_MEMBER_OFFSET(Z80, hl.uint16_value),
Z_MEMBER_OFFSET(Z80, sp.uint16_value)};
static zusize const t_table[4] = {
Z_MEMBER_OFFSET(Z80, bc.uint16_value),
Z_MEMBER_OFFSET(Z80, de.uint16_value),
Z_MEMBER_OFFSET(Z80, hl.uint16_value),
Z_MEMBER_OFFSET(Z80, af.uint16_value)};
static zusize const w_table[4] = {
Z_MEMBER_OFFSET(Z80, bc.uint16_value),
Z_MEMBER_OFFSET(Z80, de.uint16_value),
Z_MEMBER_OFFSET(Z80, xy.uint16_value),
Z_MEMBER_OFFSET(Z80, sp.uint16_value)};
#define REGISTER_16(table, offset) \
*(zuint16 *)(void *)((zchar *)self + table[(DATA[offset] >> 4) & 3])
#define SS0 REGISTER_16(s_table, 0)
#define SS1 REGISTER_16(s_table, 1)
#define TT REGISTER_16(t_table, 0)
#define WW REGISTER_16(w_table, 1)
/* MARK: - Condition Evaluation */
/*---------. .----------.
| 76543210 | | Z |
|----------| |----------|
| __zzz___ | | 000 = nz |
| ___zz___ | | 001 = z |
'----------' | 010 = nc |
| 011 = c |
| 100 = po |
| 101 = pe |
| 110 = p |
| 111 = m |
'---------*/
static zuint8 const z_table[8] = {ZF, ZF, CF, CF, PF, PF, SF, SF};
static Z_ALWAYS_INLINE zsint zzz(Z80 const *self, zuint8 mask)
{
zsint z = (DATA[0] >> 3) & mask;
return !(F & z_table[z]) ^ (z & 1);
}
/* MARK: - 8-Bit Arithmetic and Logical Operations */
/*---------. .---------------------.
| 76543210 | | U SZYHXPNC |
|----------| |---------------------|
| __uuu___ | | 000 = add szycxv0c |
| _____10v | | 001 = adc szycxv0c |
'----------' | 010 = sub szybxv1b |
| 011 = sbc szybxv1b |
| 100 = and szy1xp00 |
| 101 = xor szy0xp00 |
| 110 = or szy0xp00 |
| 111 = cp sz*b*v1b |
|---------------------|
| V SZYHXPNC |
|---------------------|
| 100 = inc szycxv0. |
| 101 = dec szybxv1. |
'--------------------*/
static void uuu(Z80 *self, zuint8 offset, zuint8 rhs)
{
zuint8 t, f;
switch ((DATA[offset] >> 3) & 7)
{
case 0: /* add */
t = A + rhs;
f = ((zuint)A + rhs > 255) | /* CF = carry */
PF_OVERFLOW(8, t, A, ~rhs) | /* PF = overflow */
((A ^ rhs ^ t) & HF); /* HF = half-carry */
/* NF = 0 */
A = t;
break;
case 1: /* adc */
t = A + rhs + (f = F_C);
f = ((zuint)A + rhs + f > 255) | /* CF = carry */
PF_OVERFLOW(8, t, A, ~rhs) | /* PF = overflow */
((A ^ rhs ^ t) & HF); /* HF = half-carry */
/* NF = 0 */
A = t;
break;
case 2: /* sub */
t = A - rhs;
f = (A < rhs) | /* CF = borrow */
NF | /* NF = 1 */
PF_OVERFLOW(8, t, A, rhs) | /* PF = overflow */
((A ^ rhs ^ t) & HF); /* HF = half-borrow */
A = t;
break;
case 3: /* sbc */
t = A - rhs - (f = F_C);
f = ((zsint)A - rhs - f < 0) | /* CF = borrow */
NF | /* NF = 1 */
PF_OVERFLOW(8, t, A, rhs) | /* PF = overflow */
((A ^ rhs ^ t) & HF); /* HF = half-borrow */
A = t;
break;
case 4: /* and */
A &= rhs;
f = HF | PF_PARITY(A); /* HF = 1; PF = parity */
break; /* NF, CF = 0 */
case 5: /* xor */
A ^= rhs;
f = PF_PARITY(A); /* PF = parity */
break; /* HF, NF, CF = 0 */
case 6: /* or */
A |= rhs;
f = PF_PARITY(A); /* PF = parity */
break; /* HF, NF, CF = 0 */
case 7: /* cp */
t = A - rhs;
FLAGS = (zuint8)(
(t & SF) | /* SF = sign */
ZF_ZERO(t) | /* ZF = zero */
((A ^ rhs ^ t) & HF) | /* HF = half-borrow */
PF_OVERFLOW(8, t, A, rhs) | /* PF = overflow */
(A < rhs) | /* CF = borrow */
(rhs & YXF) | /* YF = rhs.5; XF = rhs.3 */
NF); /* NF = 1 */
return;
}
FLAGS = (zuint8)(
f | /* HF, PF, NF and CF already computed */
A_SYX | /* SF = sign; YF = Y; XF = X */
ZF_ZERO(A)); /* ZF = zero */
}
static zuint8 vvv(Z80 *self, zuint8 offset, zuint8 value)
{
zuint8 dec = DATA[offset] & 1;
zuint8 nf = (zuint8)(dec << 1);
zuint8 t = value + 1 - nf;
FLAGS = (zuint8)(
(t & SYXF) | /* SF = sign; YF = Y; XF = X */
ZF_ZERO(t) | /* ZF = zero */
((value ^ t) & HF) | /* HF = half-carry/borrow */
((value == 127 + dec) << 2) | /* PF = overflow */
nf | /* NF = 0 (inc), 1 (dec) */
F_C); /* CF unchanged */
return t;
}
/* MARK: - Rotation and Shift Operations */
/*---------. .-----------.
| 76543210 | | G |
|----------| |-----------|
| __ggg___ | | 000 = rlc |
'----------' | 001 = rrc |
| 010 = rl |
| 011 = rr |
| 100 = sla |
| 101 = sra |
| 110 = sll |
| 111 = srl |
'----------*/
static zuint8 ggg(Z80 *self, zuint8 offset, zuint8 value)
{
zuint8 cf;
switch ((DATA[offset] >> 3) & 7)
{
/* rlc .----------------.
.----. | .---------. |
| CF |<-----| 7 <-- 0 |<--'
'----' '--------*/
case 0:
cf = (value = ROL(value)) & 1;
break;
/* rrc .----------------.
| .---------. | .----.
'-->| 7 --> 0 |----->| CF |
'---------' '---*/
case 1:
cf = value & 1;
value = ROR(value);
break;
/* rl .-------------------------.
| .----. .---------. |
'--| CF |<--| 7 <-- 0 |<--'
'----' '--------*/
case 2:
cf = value >> 7;
value = (zuint8)((value << 1) | F_C);
break;
/* rr .-------------------------.
| .---------. .----. |
'-->| 7 --> 0 |-->| CF |--'
'---------' '---*/
case 3:
cf = value & 1;
value = (zuint8)((value >> 1) | ((zuint8)F_C << 7));
break;
/* sla .----. .---------.
| CF |<--| 7 <-- 0 |<-- 0
'----' '--------*/
case 4:
cf = value >> 7;
value <<= 1;
break;
/* sra .---------. .----.
.-->| 7 --> 0 |-->| CF |
| '-|-------' '----'
'----*/
case 5:
cf = value & 1;
value = (zuint8)((value & 128) | (value >> 1));
break;
/* sll .----. .---------.
| CF |<--| 7 <-- 0 |<-- 1
'----' '--------*/
case 6:
cf = value >> 7;
value = (zuint8)((value << 1) | 1);
break;
/* srl .---------. .----.
0 -->| 7 --> 0 |-->| CF |
'---------' '---*/
case 7:
cf = value & 1;
value >>= 1;
break;
/* Uncoment to avoid compiler warnings */
/*default: cf = 0;*/
}
FLAGS = (zuint8)( /* HF, NF = 0 */
(value & SYXF) | /* SF = sign; YF = Y; XF = X */
ZF_ZERO(value) | /* ZF = zero */
PF_PARITY(value) | /* PF = parity */
cf); /* CF already computed */
return value;
}
/* MARK: - Bit Set and Reset Operations */
/*---------. .---------.
| 76543210 | | M |
|----------| |---------|
| _m______ | | 0 = res |
'----------' | 1 = set |
'--------*/
static Z_ALWAYS_INLINE zuint8 m(Z80 *self, zuint8 offset, zuint8 value)
{
zuint8 t;
Q_0
return (zuint8)(((t = DATA[offset]) & 64)
? value | (1U << ((t >> 3) & 7))
: value & ~(1U << ((t >> 3) & 7)));
}
/* MARK: - Function Shortcuts and Reusable Code */
#define INSN(name) static zuint8 name(Z80 *self)
#define N(offset) ((DATA[offset] >> 3) & 7)
#define Z(mask) zzz(self, mask)
#define U0(value) uuu(self, 0, value)
#define U1(value) uuu(self, 1, value)
#define V0(value) vvv(self, 0, value)
#define V1(value) vvv(self, 1, value)
#define G1(value) ggg(self, 1, value)
#define G3(value) ggg(self, 3, value)
#define M1(value) m (self, 1, value)
#define M3(value) m (self, 3, value)
#define PUSH(value) WRITE_16B(SP -= 2, value)
#define R_ALL ((R & 127) | (R7 & 128))
#define RET MEMPTR = PC = READ_16(SP); SP += 2
#define FETCH_XY_EA(address) MEMPTR = (zuint16)(XY + (zsint8)FETCH(address))
#define IS_XY_PREFIX(opcode) ((opcode) & 0xDF) == 0xDD
#define EX(a, b) t = a; a = b; b = t
#define LD_A_IR(rhs) \
A = rhs; \
\
FLAGS = (zuint8)( /* HF, NF = 0 */ \
A_SYX | /* SF = sign; YF = Y; XF = X */ \
ZF_ZERO(A) | /* ZF = zero */ \
(IFF2 << 2) | /* PF = IFF2 */ \
F_C); /* CF unchanged */ \
\
PC += 2; \
return 9
#define LD_VWORD_COMMON(insn_size) \
zuint16 n; \
\
Q_0 \
MEMPTR = (n = FETCH_16((PC += insn_size) - 2)) + 1
#define EX_VSP(rhs, pc_increment) \
zuint16 sp, t = rhs; \
\
Q_0 \
pc_increment; \
rhs = MEMPTR = READ_16(sp = SP); \
WRITE_16B(sp, t); \
return 19
#define LDX(operator) \
zuint8 t = READ(HL operator); \
\
WRITE(DE operator, t); \
t += A; \
\
FLAGS = (zuint8)( /* HF, NF = 0 */ \
F_SZC | /* SF, ZF, CF unchanged */ \
((t & 2) << 4) | /* YF = (A + [HLi]).1 */ \
(t & XF) | /* XF = (A + [HLi]).3 */ \
(!!(--BC) << 2)); /* PF = !!BCo */ \
\
PC += 2; \
return 16
#define LDXR(operator) \
zuint8 t = READ(HL operator); \
\
WRITE(DE operator, t); \
t += A; \
\
if (--BC) \
{ /* HF, NF = 0 */ \
FLAGS = F_SZC | /* SF, ZF, CF unchanged */ \
((PC >> 8) & YXF) | /* YF = PCi.13; XF = PCi.11 */ \
PF; /* PF = 1 */ \
\
MEMPTR = PC + 1; \
return 21; \
} \
\
FLAGS = (zuint8)( /* HF, PF, NF = 0 */ \
F_SZC | /* SF, ZF, CF unchanged */ \
((t & 2) << 4) | /* YF = (A + [HLi]).1 */ \
(t & XF)); /* XF = (A + [HLi]).3 */ \
\
PC += 2; \
return 16
#define CPX(operator) \
zuint8 n = READ(HL operator); \
zuint8 t0 = A - n; \
zuint8 hf = (A ^ n ^ t0) & HF; \
zuint8 t1 = t0 - (hf >> 4); \
\
FLAGS = (zuint8)( \
(t0 & SF) | /* SF = sign */ \
ZF_ZERO(t0) | /* ZF = zero */ \
hf | /* HF = half-borrow */ \
((t1 & 2) << 4) | /* YF = (A - [HLi] - HFo).1 */ \
(t1 & XF) | /* XF = (A - [HLi] - HFo).3 */ \
(!!(--BC) << 2) | /* PF = !!BCo */ \
NF | /* NF = 1 */ \
F_C); /* CF unchanged */ \
\
MEMPTR operator; \
PC += 2; \
return 16
#define CPXR(operator) \
zuint8 n = READ(HL operator); \
zuint8 t0 = A - n; \
zuint8 hf = (A ^ n ^ t0) & HF; \