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zymosis.c
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/*
* Z80 CPU emulation engine v0.0.3b
* coded by Ketmar // Vampire Avalon
*
* This program is free software. It comes without any warranty, to
* the extent permitted by applicable law. You can redistribute it
* and/or modify it under the terms of the Do What The Fuck You Want
* To Public License, Version 2, as published by Sam Hocevar. See
* http://sam.zoy.org/wtfpl/COPYING for more details.
*/
#include <stdlib.h>
#include "zymosis.h"
/******************************************************************************/
/* some funny tables */
static uint8_t tablesInitialized = 0;
static uint8_t sz53pTable[256]; /* bits 3, 5 and 7 of result, Z and P flags */
/******************************************************************************/
void Z80_InitTables (void) {
if (!tablesInitialized) {
int16_t f;
/***/
for (f = 0; f <= 255; ++f) {
int n, p;
/***/
for (n = f, p = 0; n != 0; n >>= 1) p ^= n&0x01;
sz53pTable[f] = (f&Z80_FLAG_S35)|(p ? 0 : Z80_FLAG_PV);
}
sz53pTable[0] |= Z80_FLAG_Z;
/***/
tablesInitialized = 1;
}
}
void Z80_ResetCallbacks (Z80Info *z80) {
if (!tablesInitialized) Z80_InitTables();
z80->memReadFn = NULL;
z80->memWriteFn = NULL;
z80->contentionFn = NULL;
z80->portInFn = NULL;
z80->portOutFn = NULL;
z80->portContentionFn = NULL;
z80->retiFn = NULL;
z80->retnFn = NULL;
z80->trapEDFn = NULL;
z80->pagerFn = NULL;
z80->checkBPFn = NULL;
}
/* seems that all regs (and memptr) should be set to 'all 1' here, but i don't care */
void Z80_Reset (Z80Info *z80) {
if (!tablesInitialized) Z80_InitTables();
z80->bc.w = z80->de.w = z80->hl.w = z80->af.w = z80->sp.w = z80->ix.w = z80->iy.w = 0;
z80->bcx.w = z80->dex.w = z80->hlx.w = z80->afx.w = 0;
z80->pc = z80->prev_pc = z80->org_pc = 0;
z80->memptr.w = 0;
z80->regI = z80->regR = 0;
z80->iff1 = z80->iff2 = 0;
z80->im = 0;
z80->halted = 0;
z80->prev_was_EIDDR = 0;
z80->tstates = 0;
z80->dd = &z80->hl;
}
/******************************************************************************/
#define Z80_EXX(_z80) do { \
uint16_t t = (_z80)->bc.w; (_z80)->bc.w = (_z80)->bcx.w; (_z80)->bcx.w = t; \
t = (_z80)->de.w; (_z80)->de.w = (_z80)->dex.w; (_z80)->dex.w = t; \
t = (_z80)->hl.w; (_z80)->hl.w = (_z80)->hlx.w; (_z80)->hlx.w = t; \
} while (0)
#define Z80_EXAFAF(_z80) do { \
uint16_t t = (_z80)->af.w; (_z80)->af.w = (_z80)->afx.w; (_z80)->afx.w = t; \
} while (0)
/******************************************************************************/
/* simulate contented memory access */
/* (tstates = tstates+contention+1)*cnt */
/* (Z80Info *z80, uint16_t addr, int tstates, Z80MemIOType mio) */
#define Z80_Contention(_z80,_addr,_tstates,_mio) do { \
if ((_z80)->contentionFn != NULL) (_z80)->contentionFn((_z80), (_addr), (_tstates), (_mio)); else (_z80)->tstates += (_tstates); \
} while (0)
#define Z80_ContentionBy1(_z80,_addr,_cnt) do { \
if ((z80)->contentionFn != NULL) { \
int _f; \
for (_f = (_cnt); _f-- > 0; (_z80)->contentionFn((_z80), (_addr), 1, Z80_MREQ_NONE|Z80_MEMIO_OTHER)) ; \
} else { \
(_z80)->tstates += (_cnt); \
} \
} while (0)
#define Z80_ContentionIRBy1(_z80,_cnt) Z80_ContentionBy1((_z80), (((uint16_t)(_z80)->regI)<<8)|((_z80)->regR), (_cnt))
#define Z80_ContentionPCBy1(_z80,_cnt) Z80_ContentionBy1((_z80), (_z80)->pc, (_cnt))
/******************************************************************************/
static ZYMOSIS_INLINE uint8_t Z80_PortIn (Z80Info *z80, uint16_t port) {
uint8_t value;
/***/
if (z80->portContentionFn != NULL) {
z80->portContentionFn(z80, port, 1, Z80_PIOFLAG_IN|Z80_PIOFLAG_EARLY);
z80->portContentionFn(z80, port, 2, Z80_PIOFLAG_IN);
} else {
z80->tstates += 3;
}
value = z80->portInFn(z80, port, Z80_PIO_NORMAL);
++z80->tstates;
return value;
}
static ZYMOSIS_INLINE void Z80_PortOut (Z80Info *z80, uint16_t port, uint8_t value) {
if (z80->portContentionFn != NULL) {
z80->portContentionFn(z80, port, 1, Z80_PIOFLAG_EARLY);
} else {
++z80->tstates;
}
z80->portOutFn(z80, port, value, Z80_PIO_NORMAL);
if (z80->portContentionFn != NULL) {
z80->portContentionFn(z80, port, 2, 0);
++z80->tstates;
} else {
z80->tstates += 3;
}
}
/******************************************************************************/
#define Z80_PeekBI(_z80,_addr) (_z80)->memReadFn((_z80), (_addr), Z80_MEMIO_OTHER)
#define Z80_PeekB(_z80,_addr) (_z80)->memReadFn((_z80), (_addr), Z80_MEMIO_DATA)
/*#define Z80_PeekWI(_z80,_addr) (((uint16_t)Z80_PeekBI((_z80), (_addr)))|(((uint16_t)Z80_PeekBI((_z80), ((_addr)+1)&0xffff))<<8)) */
#define Z80_PokeBI(_z80,_addr,_byte) (_z80)->memWriteFn((_z80), (_addr), (_byte), Z80_MEMIO_OTHER)
#define Z80_PokeB(_z80,_addr,_byte) (_z80)->memWriteFn((_z80), (_addr), (_byte), Z80_MEMIO_DATA)
/* t1: setting /MREQ & /RD */
/* t2: memory read */
/*#define Z80_PeekB3T(_z80,_addr) (Z80_Contention(_z80, (_addr), 3, Z80_MREQ_READ|Z80_MEMIO_DATA), Z80_PeekB(_z80, (_addr))) */
static ZYMOSIS_INLINE uint8_t Z80_PeekB3T (Z80Info *z80, uint16_t addr) {
Z80_Contention(z80, addr, 3, Z80_MREQ_READ|Z80_MEMIO_DATA);
return Z80_PeekB(z80, addr);
}
static ZYMOSIS_INLINE uint8_t Z80_PeekB3TA (Z80Info *z80, uint16_t addr) {
Z80_Contention(z80, addr, 3, Z80_MREQ_READ|Z80_MEMIO_OPCARG);
return Z80_PeekB(z80, addr);
}
/* t1: setting /MREQ & /WR */
/* t2: memory write */
#define Z80_PokeB3T(_z80,_addr,_byte) do { \
Z80_Contention((_z80), (_addr), 3, Z80_MREQ_WRITE|Z80_MEMIO_DATA); \
Z80_PokeB((_z80), (_addr), (_byte)); \
} while (0)
static ZYMOSIS_INLINE uint16_t Z80_PeekW6T (Z80Info *z80, uint16_t addr) {
uint16_t res = Z80_PeekB3T(z80, addr);
return res|(((uint16_t)Z80_PeekB3T(z80, (addr+1)&0xffff))<<8);
}
static ZYMOSIS_INLINE void Z80_PokeW6T (Z80Info *z80, uint16_t addr, uint16_t value) {
Z80_PokeB3T(z80, addr, value&0xff);
Z80_PokeB3T(z80, (addr+1)&0xffff, (value>>8)&0xff);
}
static ZYMOSIS_INLINE void Z80_PokeW6TInv (Z80Info *z80, uint16_t addr, uint16_t value) {
Z80_PokeB3T(z80, (addr+1)&0xffff, (value>>8)&0xff);
Z80_PokeB3T(z80, addr, value&0xff);
}
static ZYMOSIS_INLINE uint16_t Z80_GetWordPC (Z80Info *z80, int wait1) {
uint16_t res = Z80_PeekB3TA(z80, z80->pc);
/***/
z80->pc = (z80->pc+1)&0xffff;
res |= ((uint16_t)Z80_PeekB3TA(z80, z80->pc))<<8;
if (wait1) Z80_ContentionPCBy1(z80, wait1);
z80->pc = (z80->pc+1)&0xffff;
return res;
}
static ZYMOSIS_INLINE uint16_t Z80_Pop6T (Z80Info *z80) {
uint16_t res = Z80_PeekB3T(z80, z80->sp.w);
/***/
z80->sp.w = (z80->sp.w+1)&0xffff;
res |= ((uint16_t)Z80_PeekB3T(z80, z80->sp.w))<<8;
z80->sp.w = (z80->sp.w+1)&0xffff;
return res;
}
/* 3 T states write high byte of PC to the stack and decrement SP */
/* 3 T states write the low byte of PC and jump to #0066 */
static ZYMOSIS_INLINE void Z80_Push6T (Z80Info *z80, uint16_t value) {
z80->sp.w = (((int32_t)z80->sp.w)-1)&0xffff;
Z80_PokeB3T(z80, z80->sp.w, (value>>8)&0xff);
z80->sp.w = (((int32_t)z80->sp.w)-1)&0xffff;
Z80_PokeB3T(z80, z80->sp.w, value&0xff);
}
/******************************************************************************/
static ZYMOSIS_INLINE void Z80_ADC_A (Z80Info *z80, uint8_t b) {
uint16_t new, o = z80->af.a;
/***/
z80->af.a = (new = o+b+(z80->af.f&Z80_FLAG_C))&0xff; /* Z80_FLAG_C is 0x01, so it's safe */
z80->af.f =
(sz53pTable[new&0xff]&~Z80_FLAG_PV) |
(new > 0xff ? Z80_FLAG_C : 0) |
((o^(~b))&(o^new)&0x80 ? Z80_FLAG_PV : 0) |
((o&0x0f)+(b&0x0f)+(z80->af.f&Z80_FLAG_C) >= 0x10 ? Z80_FLAG_H : 0);
}
static ZYMOSIS_INLINE void Z80_SBC_A (Z80Info *z80, uint8_t b) {
uint16_t new, o = z80->af.a;
/***/
z80->af.a = (new = ((int32_t)o-(int32_t)b-(int32_t)(z80->af.f&Z80_FLAG_C))&0xffff)&0xff; /* Z80_FLAG_C is 0x01, so it's safe */
z80->af.f =
Z80_FLAG_N |
(sz53pTable[new&0xff]&~Z80_FLAG_PV) |
(new > 0xff ? Z80_FLAG_C : 0) |
((o^b)&(o^new)&0x80 ? Z80_FLAG_PV : 0) |
((int32_t)(o&0x0f)-(int32_t)(b&0x0f)-(int32_t)(z80->af.f&Z80_FLAG_C) < 0 ? Z80_FLAG_H : 0);
}
static ZYMOSIS_INLINE void Z80_ADD_A (Z80Info *z80, uint8_t b) {
z80->af.f &= ~Z80_FLAG_C;
Z80_ADC_A(z80, b);
}
static ZYMOSIS_INLINE void Z80_SUB_A (Z80Info *z80, uint8_t b) {
z80->af.f &= ~Z80_FLAG_C;
Z80_SBC_A(z80, b);
}
static ZYMOSIS_INLINE void Z80_CP_A (Z80Info *z80, uint8_t b) {
uint8_t o = z80->af.a, new = ((int32_t)o-(int32_t)b)&0xff;
/***/
z80->af.f =
Z80_FLAG_N |
(new&Z80_FLAG_S) |
(b&Z80_FLAG_35) |
(new == 0 ? Z80_FLAG_Z : 0) |
(o < b ? Z80_FLAG_C : 0) |
((o^b)&(o^new)&0x80 ? Z80_FLAG_PV : 0) |
((int32_t)(o&0x0f)-(int32_t)(b&0x0f) < 0 ? Z80_FLAG_H : 0);
}
#define Z80_AND_A(_z80,_b) ((_z80)->af.f = sz53pTable[(_z80)->af.a&=(_b)]|Z80_FLAG_H)
#define Z80_OR_A(_z80,_b) ((_z80)->af.f = sz53pTable[(_z80)->af.a|=(_b)])
#define Z80_XOR_A(_z80,_b) ((_z80)->af.f = sz53pTable[(_z80)->af.a^=(_b)])
/* carry unchanged */
static ZYMOSIS_INLINE uint8_t Z80_DEC8 (Z80Info *z80, uint8_t b) {
z80->af.f &= Z80_FLAG_C;
z80->af.f |= Z80_FLAG_N |
(b == 0x80 ? Z80_FLAG_PV : 0) |
(b&0x0f ? 0 : Z80_FLAG_H) |
(sz53pTable[(((int)b)-1)&0xff]&~Z80_FLAG_PV);
return (((int)b)-1)&0xff;
}
/* carry unchanged */
static ZYMOSIS_INLINE uint8_t Z80_INC8 (Z80Info *z80, uint8_t b) {
z80->af.f &= Z80_FLAG_C;
z80->af.f |=
(b == 0x7f ? Z80_FLAG_PV : 0) |
((b+1)&0x0f ? 0 : Z80_FLAG_H ) |
(sz53pTable[(b+1)&0xff]&~Z80_FLAG_PV);
return ((b+1)&0xff);
}
/* cyclic, carry reflects shifted bit */
static ZYMOSIS_INLINE void Z80_RLCA (Z80Info *z80) {
uint8_t c = ((z80->af.a>>7)&0x01);
/***/
z80->af.a = (z80->af.a<<1)|c;
z80->af.f = c|(z80->af.a&Z80_FLAG_35)|(z80->af.f&(Z80_FLAG_PV|Z80_FLAG_Z|Z80_FLAG_S));
}
/* cyclic, carry reflects shifted bit */
static ZYMOSIS_INLINE void Z80_RRCA (Z80Info *z80) {
uint8_t c = (z80->af.a&0x01);
/***/
z80->af.a = (z80->af.a>>1)|(c<<7);
z80->af.f = c|(z80->af.a&Z80_FLAG_35)|(z80->af.f&(Z80_FLAG_PV|Z80_FLAG_Z|Z80_FLAG_S));
}
/* cyclic thru carry */
static ZYMOSIS_INLINE void Z80_RLA (Z80Info *z80) {
uint8_t c = ((z80->af.a>>7)&0x01);
/***/
z80->af.a = (z80->af.a<<1)|(z80->af.f&Z80_FLAG_C);
z80->af.f = c|(z80->af.a&Z80_FLAG_35)|(z80->af.f&(Z80_FLAG_PV|Z80_FLAG_Z|Z80_FLAG_S));
}
/* cyclic thru carry */
static ZYMOSIS_INLINE void Z80_RRA (Z80Info *z80) {
uint8_t c = (z80->af.a&0x01);
/***/
z80->af.a = (z80->af.a>>1)|((z80->af.f&Z80_FLAG_C)<<7);
z80->af.f = c|(z80->af.a&Z80_FLAG_35)|(z80->af.f&(Z80_FLAG_PV|Z80_FLAG_Z|Z80_FLAG_S));
}
/* cyclic thru carry */
static ZYMOSIS_INLINE uint8_t Z80_RL (Z80Info *z80, uint8_t b) {
uint8_t c = (b>>7)&Z80_FLAG_C;
/***/
z80->af.f = sz53pTable[(b = ((b<<1)&0xff)|(z80->af.f&Z80_FLAG_C))]|c;
return b;
}
static ZYMOSIS_INLINE uint8_t Z80_RR (Z80Info *z80, uint8_t b) {
uint8_t c = (b&0x01);
/***/
z80->af.f = sz53pTable[(b = (b>>1)|((z80->af.f&Z80_FLAG_C)<<7))]|c;
return b;
}
/* cyclic, carry reflects shifted bit */
static ZYMOSIS_INLINE uint8_t Z80_RLC (Z80Info *z80, uint8_t b) {
uint8_t c = ((b>>7)&Z80_FLAG_C);
/***/
z80->af.f = sz53pTable[(b = ((b<<1)&0xff)|c)]|c;
return b;
}
/* cyclic, carry reflects shifted bit */
static ZYMOSIS_INLINE uint8_t Z80_RRC (Z80Info *z80, uint8_t b) {
uint8_t c = (b&0x01);
/***/
z80->af.f = sz53pTable[(b = (b>>1)|(c<<7))]|c;
return b;
}
static ZYMOSIS_INLINE uint8_t Z80_SLA (Z80Info *z80, uint8_t b) {
uint8_t c = ((b>>7)&0x01);
/***/
z80->af.f = sz53pTable[(b <<= 1)]|c;
return b;
}
static ZYMOSIS_INLINE uint8_t Z80_SRA (Z80Info *z80, uint8_t b) {
uint8_t c = (b&0x01);
/***/
z80->af.f = sz53pTable[(b = (b>>1)|(b&0x80))]|c;
return b;
}
static ZYMOSIS_INLINE uint8_t Z80_SLL (Z80Info *z80, uint8_t b) {
uint8_t c = ((b>>7)&0x01);
/***/
z80->af.f = sz53pTable[(b = (b<<1)|0x01)]|c;
return b;
}
static ZYMOSIS_INLINE uint8_t Z80_SLR (Z80Info *z80, uint8_t b) {
uint8_t c = (b&0x01);
/***/
z80->af.f = sz53pTable[(b >>= 1)]|c;
return b;
}
/* ddvalue+value */
static ZYMOSIS_INLINE uint16_t Z80_ADD_DD (Z80Info *z80, uint16_t value, uint16_t ddvalue) {
static const uint8_t hct[8] = { 0, Z80_FLAG_H, Z80_FLAG_H, Z80_FLAG_H, 0, 0, 0, Z80_FLAG_H };
uint32_t res = (uint32_t)value+(uint32_t)ddvalue;
uint8_t b = ((value&0x0800)>>11)|((ddvalue&0x0800)>>10)|((res&0x0800)>>9);
/***/
z80->memptr.w = (ddvalue+1)&0xffff;
z80->af.f =
(z80->af.f&(Z80_FLAG_PV|Z80_FLAG_Z|Z80_FLAG_S))|
(res > 0xffff ? Z80_FLAG_C : 0)|
((res>>8)&Z80_FLAG_35)|
hct[b];
return res;
}
/* ddvalue+value */
static ZYMOSIS_INLINE uint16_t Z80_ADC_DD (Z80Info *z80, uint16_t value, uint16_t ddvalue) {
uint8_t c = (z80->af.f&Z80_FLAG_C);
uint32_t new = (uint32_t)value+(uint32_t)ddvalue+(uint32_t)c;
uint16_t res = (new&0xffff);
/***/
z80->memptr.w = (ddvalue+1)&0xffff;
z80->af.f =
((res>>8)&Z80_FLAG_S35) |
(res == 0 ? Z80_FLAG_Z : 0) |
(new > 0xffff ? Z80_FLAG_C : 0) |
((value^((~ddvalue)&0xffff))&(value^new)&0x8000 ? Z80_FLAG_PV : 0) |
((value&0x0fff)+(ddvalue&0x0fff)+c >= 0x1000 ? Z80_FLAG_H : 0);
return res;
}
/* ddvalue-value */
static ZYMOSIS_INLINE uint16_t Z80_SBC_DD (Z80Info *z80, uint16_t value, uint16_t ddvalue) {
uint16_t res;
uint8_t tmpB = z80->af.a;
/***/
z80->memptr.w = (ddvalue+1)&0xffff;
z80->af.a = ddvalue&0xff;
Z80_SBC_A(z80, value&0xff);
res = z80->af.a;
z80->af.a = (ddvalue>>8)&0xff;
Z80_SBC_A(z80, (value>>8)&0xff);
res |= (z80->af.a<<8);
z80->af.a = tmpB;
z80->af.f = (res ? z80->af.f&(~Z80_FLAG_Z) : z80->af.f|Z80_FLAG_Z);
return res;
}
static ZYMOSIS_INLINE void Z80_BIT (Z80Info *z80, uint8_t bit, uint8_t num, int mptr) {
z80->af.f =
Z80_FLAG_H |
(z80->af.f&Z80_FLAG_C)|
(num&Z80_FLAG_35) |
(num&(1<<bit) ? 0 : Z80_FLAG_PV|Z80_FLAG_Z) |
(bit == 7 ? num&Z80_FLAG_S : 0);
if (mptr) z80->af.f = (z80->af.f&~Z80_FLAG_35)|(z80->memptr.h&Z80_FLAG_35);
}
static ZYMOSIS_INLINE void Z80_DAA (Z80Info *z80) {
uint8_t tmpI = 0, tmpC = (z80->af.f&Z80_FLAG_C), tmpA = z80->af.a;
/***/
if ((z80->af.f&Z80_FLAG_H) || (tmpA&0x0f) > 9) tmpI = 6;
if (tmpC != 0 || tmpA > 0x99) tmpI |= 0x60;
if (tmpA > 0x99) tmpC = Z80_FLAG_C;
if (z80->af.f&Z80_FLAG_N) Z80_SUB_A(z80, tmpI); else Z80_ADD_A(z80, tmpI);
z80->af.f = (z80->af.f&~(Z80_FLAG_C|Z80_FLAG_PV))|tmpC|(sz53pTable[z80->af.a]&Z80_FLAG_PV);
}
static ZYMOSIS_INLINE void Z80_RRD_A (Z80Info *z80) {
uint8_t tmpB = Z80_PeekB3T(z80, z80->hl.w);
/*IOP(4)*/
z80->memptr.w = (z80->hl.w+1)&0xffff;
Z80_ContentionBy1(z80, z80->hl.w, 4);
Z80_PokeB3T(z80, z80->hl.w, (z80->af.a<<4)|(tmpB>>4));
z80->af.a = (z80->af.a&0xf0)|(tmpB&0x0f);
z80->af.f = (z80->af.f&Z80_FLAG_C)|sz53pTable[z80->af.a];
}
static ZYMOSIS_INLINE void Z80_RLD_A (Z80Info *z80) {
uint8_t tmpB = Z80_PeekB3T(z80, z80->hl.w);
/*IOP(4)*/
z80->memptr.w = (z80->hl.w+1)&0xffff;
Z80_ContentionBy1(z80, z80->hl.w, 4);
Z80_PokeB3T(z80, z80->hl.w, (tmpB<<4)|(z80->af.a&0x0f));
z80->af.a = (z80->af.a&0xf0)|(tmpB>>4);
z80->af.f = (z80->af.f&Z80_FLAG_C)|sz53pTable[z80->af.a];
}
static ZYMOSIS_INLINE void Z80_LD_A_IR (Z80Info *z80, uint8_t ir) {
z80->af.a = ir;
z80->prev_was_EIDDR = -1;
Z80_ContentionIRBy1(z80, 1);
z80->af.f = (sz53pTable[z80->af.a]&~Z80_FLAG_PV)|(z80->af.f&Z80_FLAG_C)|(z80->iff2 ? Z80_FLAG_PV : 0);
}
/******************************************************************************/
#define INC_R (z80->regR = ((z80->regR+1)&0x7f)|(z80->regR&0x80))
#define SET_TRUE_CC \
switch ((opcode>>3)&0x07) { \
case 0: trueCC = (z80->af.f&Z80_FLAG_Z) == 0; break; \
case 1: trueCC = (z80->af.f&Z80_FLAG_Z) != 0; break; \
case 2: trueCC = (z80->af.f&Z80_FLAG_C) == 0; break; \
case 3: trueCC = (z80->af.f&Z80_FLAG_C) != 0; break; \
case 4: trueCC = (z80->af.f&Z80_FLAG_PV) == 0; break; \
case 5: trueCC = (z80->af.f&Z80_FLAG_PV) != 0; break; \
case 6: trueCC = (z80->af.f&Z80_FLAG_S) == 0; break; \
case 7: trueCC = (z80->af.f&Z80_FLAG_S) != 0; break; \
}
#define INC_PC (z80->pc = (z80->pc+1)&0xffff)
#define DEC_PC (z80->pc = ((int32_t)(z80->pc)-1)&0xffff)
#define INC_W(n) ((n) = ((n)+1)&0xffff)
#define DEC_W(n) ((n) = ((int32_t)(n)-1)&0xffff)
#define XADD_W(n,v) ((n) = ((n)+v)&0xffff)
#define XSUB_W(n,v) ((n) = ((int32_t)(n)-v)&0xffff)
#define ZADD_W(n,v) ((n) = ((int32_t)(n)+v)&0xffff)
#define ZADD_WX(n,v) (((int32_t)(n)+v)&0xffff)
#define INC_B(n) ((n) = ((n)+1)&0xff)
#define DEC_B(n) ((n) = ((int32_t)(n)-1)&0xff)
/* t1: setting /MREQ & /RD */
/* t2: memory read */
/* t3, t4: decode command, increment R */
#define GET_OPCODE(_opc) do { \
Z80_Contention(z80, z80->pc, 4, Z80_MREQ_READ|Z80_MEMIO_OPCODE); \
if (z80->evenM1 && (z80->tstates&0x01)) ++z80->tstates; \
(_opc) = z80->memReadFn(z80, z80->pc, Z80_MEMIO_OPCODE); \
z80->pc = (z80->pc+1)&0xffff; \
z80->regR = ((z80->regR+1)&0x7f)|(z80->regR&0x80); \
} while (0)
#define GET_OPCODE_EXT(_opc) do { \
Z80_Contention(z80, z80->pc, 4, Z80_MREQ_READ|Z80_MEMIO_OPCEXT); \
(_opc) = z80->memReadFn(z80, z80->pc, Z80_MEMIO_OPCEXT); \
z80->pc = (z80->pc+1)&0xffff; \
z80->regR = ((z80->regR+1)&0x7f)|(z80->regR&0x80); \
} while (0)
#define CBX_REPEATED (opcode&0x10)
#define CBX_BACKWARD (opcode&0x08)
void Z80_Execute (Z80Info *z80) {
uint8_t opcode;
int gotDD, trueCC; /* booleans */
int disp;
uint8_t tmpB, tmpC, rsrc, rdst;
uint16_t tmpW = 0; /* shut up the compiler; it's wrong but stubborn */
/***/
while (z80->tstates < z80->next_event_tstate) {
if (z80->pagerFn != NULL) z80->pagerFn(z80);
if (z80->checkBPFn != NULL && z80->checkBPFn(z80)) return;
z80->prev_pc = z80->org_pc; z80->org_pc = z80->pc;
/* read opcode -- OCR(4) */
GET_OPCODE(opcode);
z80->prev_was_EIDDR = 0;
disp = gotDD = 0;
z80->dd = &z80->hl;
if (z80->halted) { DEC_W(z80->pc); continue; }
/***/
if (opcode == 0xdd || opcode == 0xfd) {
static const uint32_t withIndexBmp[8] = {0x00,0x700000,0x40404040,0x40bf4040,0x40404040,0x40404040,0x0800,0x00};
/* IX/IY prefix */
z80->dd = (opcode == 0xdd ? &z80->ix : &z80->iy);
/* read opcode -- OCR(4) */
GET_OPCODE_EXT(opcode);
/* test if this instruction have (HL) */
if (withIndexBmp[opcode>>5]&(1<<(opcode&0x1f))) {
/* 3rd byte is always DISP here */
disp = Z80_PeekB3TA(z80, z80->pc); if (disp > 127) disp -= 256;
INC_PC;
z80->memptr.w = ZADD_WX(z80->dd->w, disp);
} else if (opcode == 0xdd || opcode == 0xfd) {
/* double prefix; restart main loop */
z80->prev_was_EIDDR = 1;
continue;
}
gotDD = 1;
}
/* instructions */
if (opcode == 0xed) {
z80->dd = &z80->hl; /* � ��� -- ����! */
/* read opcode -- OCR(4) */
GET_OPCODE_EXT(opcode);
switch (opcode) {
/* LDI, LDIR, LDD, LDDR */
case 0xa0: case 0xb0: case 0xa8: case 0xb8:
tmpB = Z80_PeekB3T(z80, z80->hl.w);
Z80_PokeB3T(z80, z80->de.w, tmpB);
/*MWR(5)*/
Z80_ContentionBy1(z80, z80->de.w, 2);
DEC_W(z80->bc.w);
tmpB = (tmpB+z80->af.a)&0xff;
/***/
z80->af.f =
(tmpB&Z80_FLAG_3) | (z80->af.f & (Z80_FLAG_C|Z80_FLAG_Z|Z80_FLAG_S)) |
(z80->bc.w != 0 ? Z80_FLAG_PV : 0) |
(tmpB&0x02 ? Z80_FLAG_5 : 0);
/***/
if (CBX_REPEATED) {
if (z80->bc.w != 0) {
/*IOP(5)*/
Z80_ContentionBy1(z80, z80->de.w, 5);
/* do it again */
XSUB_W(z80->pc, 2);
z80->memptr.w = (z80->pc+1)&0xffff;
}
}
if (!CBX_BACKWARD) { INC_W(z80->hl.w); INC_W(z80->de.w); } else { DEC_W(z80->hl.w); DEC_W(z80->de.w); }
break;
/* CPI, CPIR, CPD, CPDR */
case 0xa1: case 0xb1: case 0xa9: case 0xb9:
/* MEMPTR */
if (CBX_REPEATED && (!(z80->bc.w == 1 || Z80_PeekBI(z80, z80->hl.w) == z80->af.a))) {
z80->memptr.w = ZADD_WX(z80->org_pc, 1);
} else {
z80->memptr.w = ZADD_WX(z80->memptr.w, (CBX_BACKWARD ? -1 : 1));
}
/***/
tmpB = Z80_PeekB3T(z80, z80->hl.w);
/*IOP(5)*/
Z80_ContentionBy1(z80, z80->hl.w, 5);
DEC_W(z80->bc.w);
/***/
z80->af.f =
Z80_FLAG_N |
(z80->af.f&Z80_FLAG_C) |
(z80->bc.w != 0 ? Z80_FLAG_PV : 0) |
((int32_t)(z80->af.a&0x0f)-(int32_t)(tmpB&0x0f) < 0 ? Z80_FLAG_H : 0);
/***/
tmpB = ((int32_t)z80->af.a-(int32_t)tmpB)&0xff;
/***/
z80->af.f |=
(tmpB == 0 ? Z80_FLAG_Z : 0) |
(tmpB&Z80_FLAG_S);
/***/
if (z80->af.f&Z80_FLAG_H) tmpB = ((uint16_t)tmpB-1)&0xff;
z80->af.f |= (tmpB&Z80_FLAG_3) | (tmpB&0x02 ? Z80_FLAG_5 : 0);
/***/
if (CBX_REPEATED) {
/* repeated */
if ((z80->af.f&(Z80_FLAG_Z|Z80_FLAG_PV)) == Z80_FLAG_PV) {
/*IOP(5)*/
Z80_ContentionBy1(z80, z80->hl.w, 5);
/* do it again */
XSUB_W(z80->pc, 2);
}
}
if (CBX_BACKWARD) DEC_W(z80->hl.w); else INC_W(z80->hl.w);
break;
/* OUTI, OTIR, OUTD, OTDR */
case 0xa3: case 0xb3: case 0xab: case 0xbb:
DEC_B(z80->bc.b);
/* fallthru */
/* INI, INIR, IND, INDR */
case 0xa2: case 0xb2: case 0xaa: case 0xba:
z80->memptr.w = ZADD_WX(z80->bc.w, (CBX_BACKWARD ? -1 : 1));
/*OCR(5)*/
Z80_ContentionIRBy1(z80, 1);
if (opcode&0x01) {
/* OUT* */
tmpB = Z80_PeekB3T(z80, z80->hl.w);/*MRD(3)*/
Z80_PortOut(z80, z80->bc.w, tmpB);
tmpW = ZADD_WX(z80->hl.w, (CBX_BACKWARD ? -1 : 1));
tmpC = (tmpB+tmpW)&0xff;
} else {
/* IN* */
tmpB = Z80_PortIn(z80, z80->bc.w);
Z80_PokeB3T(z80, z80->hl.w, tmpB);/*MWR(3)*/
DEC_B(z80->bc.b);
if (CBX_BACKWARD) tmpC = ((int32_t)tmpB+(int32_t)z80->bc.c-1)&0xff; else tmpC = (tmpB+z80->bc.c+1)&0xff;
}
/***/
z80->af.f =
(tmpB&0x80 ? Z80_FLAG_N : 0) |
(tmpC < tmpB ? Z80_FLAG_H|Z80_FLAG_C : 0) |
(sz53pTable[(tmpC&0x07)^z80->bc.b]&Z80_FLAG_PV) |
(sz53pTable[z80->bc.b]&~Z80_FLAG_PV);
/***/
if (CBX_REPEATED) {
/* repeating commands */
if (z80->bc.b != 0) {
uint16_t a = (opcode&0x01 ? z80->bc.w : z80->hl.w);
/***/
/*IOP(5)*/
Z80_ContentionBy1(z80, a, 5);
/* do it again */
XSUB_W(z80->pc, 2);
}
}
if (CBX_BACKWARD) DEC_W(z80->hl.w); else INC_W(z80->hl.w);
break;
/* not strings, but some good instructions anyway */
default:
if ((opcode&0xc0) == 0x40) {
/* 0x40...0x7f */
switch (opcode&0x07) {
/* IN r8,(C) */
case 0:
z80->memptr.w = ZADD_WX(z80->bc.w, 1);
tmpB = Z80_PortIn(z80, z80->bc.w);
z80->af.f = sz53pTable[tmpB]|(z80->af.f&Z80_FLAG_C);
switch ((opcode>>3)&0x07) {
case 0: z80->bc.b = tmpB; break;
case 1: z80->bc.c = tmpB; break;
case 2: z80->de.d = tmpB; break;
case 3: z80->de.e = tmpB; break;
case 4: z80->hl.h = tmpB; break;
case 5: z80->hl.l = tmpB; break;
case 7: z80->af.a = tmpB; break;
/* 6 affects only flags */
}
break;
/* OUT (C),r8 */
case 1:
z80->memptr.w = ZADD_WX(z80->bc.w, 1);
switch ((opcode>>3)&0x07) {
case 0: tmpB = z80->bc.b; break;
case 1: tmpB = z80->bc.c; break;
case 2: tmpB = z80->de.d; break;
case 3: tmpB = z80->de.e; break;
case 4: tmpB = z80->hl.h; break;
case 5: tmpB = z80->hl.l; break;
case 7: tmpB = z80->af.a; break;
default: tmpB = 0; break; /*6*/
}
Z80_PortOut(z80, z80->bc.w, tmpB);
break;
/* SBC HL,rr/ADC HL,rr */
case 2:
/*IOP(4),IOP(3)*/
Z80_ContentionIRBy1(z80, 7);
switch ((opcode>>4)&0x03) {
case 0: tmpW = z80->bc.w; break;
case 1: tmpW = z80->de.w; break;
case 2: tmpW = z80->hl.w; break;
default: tmpW = z80->sp.w; break;
}
z80->hl.w = (opcode&0x08 ? Z80_ADC_DD(z80, tmpW, z80->hl.w) : Z80_SBC_DD(z80, tmpW, z80->hl.w));
break;
/* LD (nn),rr/LD rr,(nn) */
case 3:
tmpW = Z80_GetWordPC(z80, 0);
z80->memptr.w = (tmpW+1)&0xffff;
if (opcode&0x08) {
/* LD rr,(nn) */
switch ((opcode>>4)&0x03) {
case 0: z80->bc.w = Z80_PeekW6T(z80, tmpW); break;
case 1: z80->de.w = Z80_PeekW6T(z80, tmpW); break;
case 2: z80->hl.w = Z80_PeekW6T(z80, tmpW); break;
case 3: z80->sp.w = Z80_PeekW6T(z80, tmpW); break;
}
} else {
/* LD (nn),rr */
switch ((opcode>>4)&0x03) {
case 0: Z80_PokeW6T(z80, tmpW, z80->bc.w); break;
case 1: Z80_PokeW6T(z80, tmpW, z80->de.w); break;
case 2: Z80_PokeW6T(z80, tmpW, z80->hl.w); break;
case 3: Z80_PokeW6T(z80, tmpW, z80->sp.w); break;
}
}
break;
/* NEG */
case 4:
tmpB = z80->af.a;
z80->af.a = 0;
Z80_SUB_A(z80, tmpB);
break;
/* RETI/RETN */
case 5:
/*RETI: 0x4d, 0x5d, 0x6d, 0x7d*/
/*RETN: 0x45, 0x55, 0x65, 0x75*/
z80->iff1 = z80->iff2;
z80->memptr.w = z80->pc = Z80_Pop6T(z80);
if (opcode&0x08) {
/* RETI */
if (z80->retiFn != NULL && z80->retiFn(z80, opcode)) return;
} else {
/* RETN */
if (z80->retnFn != NULL && z80->retnFn(z80, opcode)) return;
}
break;
/* IM n */
case 6:
switch (opcode) {
case 0x56: case 0x76: z80->im = 1; break;
case 0x5e: case 0x7e: z80->im = 2; break;
default: z80->im = 0; break;
}
break;
/* specials */
case 7:
switch (opcode) {
/* LD I,A */
case 0x47:
/*OCR(5)*/
Z80_ContentionIRBy1(z80, 1);
z80->regI = z80->af.a;
break;
/* LD R,A */
case 0x4f:
/*OCR(5)*/
Z80_ContentionIRBy1(z80, 1);
z80->regR = z80->af.a;
break;
/* LD A,I */
case 0x57: Z80_LD_A_IR(z80, z80->regI); break;
/* LD A,R */
case 0x5f: Z80_LD_A_IR(z80, z80->regR); break;
/* RRD */
case 0x67: Z80_RRD_A(z80); break;
/* RLD */
case 0x6F: Z80_RLD_A(z80); break;
}
}
} else {
/* slt and other traps */
if (z80->trapEDFn != NULL && z80->trapEDFn(z80, opcode)) return;
}
break;
}
continue;
} /* 0xed done */
/***/
if (opcode == 0xcb) {
/* shifts and bit operations */
/* read opcode -- OCR(4) */
if (!gotDD) {
GET_OPCODE_EXT(opcode);
} else {
Z80_Contention(z80, z80->pc, 3, Z80_MREQ_READ|Z80_MEMIO_OPCEXT);
opcode = z80->memReadFn(z80, z80->pc, Z80_MEMIO_OPCEXT);
Z80_ContentionPCBy1(z80, 2);
INC_PC;
}
if (gotDD) {
tmpW = ZADD_WX(z80->dd->w, disp);
tmpB = Z80_PeekB3T(z80, tmpW);
Z80_ContentionBy1(z80, tmpW, 1);
} else {
switch (opcode&0x07) {
case 0: tmpB = z80->bc.b; break;
case 1: tmpB = z80->bc.c; break;
case 2: tmpB = z80->de.d; break;
case 3: tmpB = z80->de.e; break;
case 4: tmpB = z80->hl.h; break;
case 5: tmpB = z80->hl.l; break;
case 6: tmpB = Z80_PeekB3T(z80, z80->hl.w); Z80_Contention(z80, z80->hl.w, 1, Z80_MREQ_READ|Z80_MEMIO_DATA); break;
case 7: tmpB = z80->af.a; break;
}
}
switch ((opcode>>3)&0x1f) {
case 0: tmpB = Z80_RLC(z80, tmpB); break;
case 1: tmpB = Z80_RRC(z80, tmpB); break;
case 2: tmpB = Z80_RL(z80, tmpB); break;
case 3: tmpB = Z80_RR(z80, tmpB); break;
case 4: tmpB = Z80_SLA(z80, tmpB); break;
case 5: tmpB = Z80_SRA(z80, tmpB); break;
case 6: tmpB = Z80_SLL(z80, tmpB); break;
case 7: tmpB = Z80_SLR(z80, tmpB); break;
default:
switch ((opcode>>6)&0x03) {
case 1: Z80_BIT(z80, (opcode>>3)&0x07, tmpB, (gotDD || (opcode&0x07) == 6)); break;
case 2: tmpB &= ~(1<<((opcode>>3)&0x07)); break; /* RES */
case 3: tmpB |= (1<<((opcode>>3)&0x07)); break; /* SET */
}
break;
}
/***/
if ((opcode&0xc0) != 0x40) {
/* BITs are not welcome here */
if (gotDD) {
/* tmpW was set earlier */
if ((opcode&0x07) != 6) Z80_PokeB3T(z80, tmpW, tmpB);
}
switch (opcode&0x07) {
case 0: z80->bc.b = tmpB; break;
case 1: z80->bc.c = tmpB; break;
case 2: z80->de.d = tmpB; break;
case 3: z80->de.e = tmpB; break;
case 4: z80->hl.h = tmpB; break;
case 5: z80->hl.l = tmpB; break;
case 6: Z80_PokeB3T(z80, ZADD_WX(z80->dd->w, disp), tmpB); break;
case 7: z80->af.a = tmpB; break;
}
}
continue;
} /* 0xcb done */
/* normal things */
switch (opcode&0xc0) {
/* 0x00..0x3F */
case 0x00:
switch (opcode&0x07) {
/* misc,DJNZ,JR,JR cc */
case 0:
if (opcode&0x30) {
/* branches */
if (opcode&0x20) {
/* JR cc */
switch ((opcode>>3)&0x03) {
case 0: trueCC = (z80->af.f&Z80_FLAG_Z) == 0; break;
case 1: trueCC = (z80->af.f&Z80_FLAG_Z) != 0; break;
case 2: trueCC = (z80->af.f&Z80_FLAG_C) == 0; break;
case 3: trueCC = (z80->af.f&Z80_FLAG_C) != 0; break;
default: trueCC = 0; break;
}
} else {
/* DJNZ/JR */
if ((opcode&0x08) == 0) {
/* DJNZ */
/*OCR(5)*/
Z80_ContentionIRBy1(z80, 1);
DEC_B(z80->bc.b);
trueCC = (z80->bc.b != 0);
} else {
/* JR */
trueCC = 1;
}
}
/***/
disp = Z80_PeekB3TA(z80, z80->pc);
if (trueCC) {
/* execute branch (relative) */
/*IOP(5)*/
if (disp > 127) disp -= 256;
Z80_ContentionPCBy1(z80, 5);
INC_PC;
ZADD_W(z80->pc, disp);
z80->memptr.w = z80->pc;
} else {
INC_PC;
}
} else {
/* EX AF,AF' or NOP */
if (opcode != 0) Z80_EXAFAF(z80);
}
break;
/* LD rr,nn/ADD HL,rr */
case 1:
if (opcode&0x08) {
/* ADD HL,rr */
/*IOP(4),IOP(3)*/
Z80_ContentionIRBy1(z80, 7);
switch ((opcode>>4)&0x03) {
case 0: z80->dd->w = Z80_ADD_DD(z80, z80->bc.w, z80->dd->w); break;
case 1: z80->dd->w = Z80_ADD_DD(z80, z80->de.w, z80->dd->w); break;
case 2: z80->dd->w = Z80_ADD_DD(z80, z80->dd->w, z80->dd->w); break;
case 3: z80->dd->w = Z80_ADD_DD(z80, z80->sp.w, z80->dd->w); break;
}
} else {
/* LD rr,nn */
tmpW = Z80_GetWordPC(z80, 0);
switch ((opcode>>4)&0x03) {
case 0: z80->bc.w = tmpW; break;
case 1: z80->de.w = tmpW; break;
case 2: z80->dd->w = tmpW; break;
case 3: z80->sp.w = tmpW; break;
}
}
break;
/* LD xxx,xxx */
case 2:
switch ((opcode>>3)&0x07) {
/* LD (BC),A */
case 0: Z80_PokeB3T(z80, z80->bc.w, z80->af.a); z80->memptr.l = (z80->bc.c+1)&0xff; z80->memptr.h = z80->af.a; break;
/* LD A,(BC) */
case 1: z80->af.a = Z80_PeekB3T(z80, z80->bc.w); z80->memptr.w = (z80->bc.w+1)&0xffff; break;
/* LD (DE),A */
case 2: Z80_PokeB3T(z80, z80->de.w, z80->af.a); z80->memptr.l = (z80->de.e+1)&0xff; z80->memptr.h = z80->af.a; break;
/* LD A,(DE) */
case 3: z80->af.a = Z80_PeekB3T(z80, z80->de.w); z80->memptr.w = (z80->de.w+1)&0xffff; break;
/* LD (nn),HL */
case 4:
tmpW = Z80_GetWordPC(z80, 0);
z80->memptr.w = (tmpW+1)&0xffff;
Z80_PokeW6T(z80, tmpW, z80->dd->w);
break;
/* LD HL,(nn) */
case 5:
tmpW = Z80_GetWordPC(z80, 0);
z80->memptr.w = (tmpW+1)&0xffff;
z80->dd->w = Z80_PeekW6T(z80, tmpW);
break;
/* LD (nn),A */
case 6:
tmpW = Z80_GetWordPC(z80, 0);
z80->memptr.l = (tmpW+1)&0xff;
z80->memptr.h = z80->af.a;
Z80_PokeB3T(z80, tmpW, z80->af.a);
break;
/* LD A,(nn) */
case 7:
tmpW = Z80_GetWordPC(z80, 0);
z80->memptr.w = (tmpW+1)&0xffff;
z80->af.a = Z80_PeekB3T(z80, tmpW);
break;
}
break;
/* INC rr/DEC rr */
case 3:
/*OCR(6)*/
Z80_ContentionIRBy1(z80, 2);
if (opcode&0x08) {
/*DEC*/
switch ((opcode>>4)&0x03) {
case 0: DEC_W(z80->bc.w); break;
case 1: DEC_W(z80->de.w); break;