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z80ops.c
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/* Emulations of the Z80 CPU instruction set - part of xz80.
* Copyright (C) 1994 Ian Collier.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#define instr(opcode,cycles) case opcode: {tstates+=cycles
#define HLinstr(opcode,cycles,morecycles) \
case opcode: {unsigned short addr; \
tstates+=cycles; \
if(ixoriy==0)addr=hl; \
else tstates+=morecycles, \
addr=(ixoriy==1?ix:iy)+ \
(signed char)fetchm(pc),\
pc++
#define endinstr }; break
#define cy (f&1)
#define xh (ixoriy==0?h:ixoriy==1?(ix>>8):(iy>>8))
#define xl (ixoriy==0?l:ixoriy==1?(ix&0xff):(iy&0xff))
#define setxh(x) (ixoriy==0?(h=(x)):ixoriy==1?(ix=(ix&0xff)|((x)<<8)):\
(iy=(iy&0xff)|((x)<<8)))
#define setxl(x) (ixoriy==0?(l=(x)):ixoriy==1?(ix=(ix&0xff00)|(x)):\
(iy=(iy&0xff00)|(x)))
#define inc(var) /* 8-bit increment */ ( var++,\
f=(f&1)|(var&0xa8)|\
((!(var&15))<<4)|((!var)<<6)|\
((var==128)<<2)\
)
#define dec(var) /* 8-bit decrement */ ( f=(f&1)|((!(var&15))<<4)|2,\
--var,\
f|=(var&0xa8)|((var==127)<<2)|\
((!var)<<6)\
)
#define swap(x,y) {unsigned char t=x; x=y; y=t;}
#define addhl(hi,lo) /* 16-bit add */ if(!ixoriy){\
unsigned short t;\
l=t=l+(lo);\
f=(f&0xc4)|(((t>>=8)+(h&0x0f)+((hi)&0x0f)>15)<<4);\
h=t+=h+(hi);\
f|=(h&0x28)|(t>>8);\
}\
else do{unsigned long t=(ixoriy==1?ix:iy);\
f=(f&0xc4)|(((t&0xfff)+((hi<<8)|lo)>0xfff)<<4);\
t+=(hi<<8)|lo;\
if(ixoriy==1)ix=t; else iy=t;\
f|=((t>>8)&0x28)|(t>>16);\
} while(0)
#define adda(x,c) /* 8-bit add */ do{unsigned short y;\
unsigned char z=(x);\
y=a+z+(c);\
f=(y&0xa8)|(y>>8)|(((a&0x0f)+(z&0x0f)+(c)>15)<<4)|\
(((~a^z)&0x80&(y^a))>>5);\
f|=(!(a=y))<<6;\
} while(0)
#define suba(x,c) /* 8-bit subtract */ do{unsigned short y;\
unsigned char z=(x);\
y=(a-z-(c))&0x1ff;\
f=(y&0xa8)|(y>>8)|(((a&0x0f)<(z&0x0f)+(c))<<4)|\
(((a^z)&0x80&(y^a))>>5)|2;\
f|=(!(a=y))<<6;\
} while(0)
#define cpa(x) /* 8-bit compare */ do{unsigned short y;\
unsigned char z=(x);\
y=(a-z)&0x1ff;\
f=(y&0xa8)|(y>>8)|(((a&0x0f)<(z&0x0f))<<4)|\
(((a^z)&0x80&(y^a))>>5)|2|((!y)<<6);\
} while(0)
#define anda(x) /* logical and */ do{\
a&=(x);\
f=(a&0xa8)|((!a)<<6)|0x10|parity(a);\
} while(0)
#define xora(x) /* logical xor */ do{\
a^=(x);\
f=(a&0xa8)|((!a)<<6)|parity(a);\
} while(0)
#define ora(x) /* logical or */ do{\
a|=(x);\
f=(a&0xa8)|((!a)<<6)|parity(a);\
} while(0)
#define jr /* execute relative jump */ do{int j=(signed char)fetch(pc);\
pc+=j+1;\
tstates+=5;\
} while(0)
#define jp /* execute jump */ (pc=fetch2(pc))
#define call /* execute call */ do{\
tstates+=7;\
push2(pc+2);\
jp;\
} while(0)
#define ret /* execute return */ do{\
tstates+=6;\
pop2(pc);\
} while(0)
#define pop2(var) /* pop 16-bit register */ (var=fetch2(sp),sp+=2)
#define pop1(v1,v2) /* pop register pair */ (v2=fetch(sp),\
v1=fetch(sp+1),sp+=2)
#define push2(val) /* push 16-bit register */ do{sp-=2;store2(sp,(val));}\
while(0)
#define push1(v1,v2) /* push register pair */ do{sp-=2;\
store2b(sp,v1,v2);\
}while(0)
instr(0,4);
/* nop */
endinstr;
instr(1,10);
c=fetch(pc),pc++;
b=fetch(pc),pc++;
endinstr;
instr(2,7);
store(bc,a);
endinstr;
instr(3,6);
if(!++c)b++;
endinstr;
instr(4,4);
inc(b);
endinstr;
instr(5,4);
dec(b);
endinstr;
instr(6,7);
b=fetch(pc),pc++;
endinstr;
instr(7,4);
a=(a<<1)|(a>>7);
f=(f&0xc4)|(a&0x29);
endinstr;
instr(8,4);
swap(a,a1);
swap(f,f1);
endinstr;
instr(9,11);
addhl(b,c);
endinstr;
instr(10,7);
a=fetch(bc);
endinstr;
instr(11,6);
if(!c--)b--;
endinstr;
instr(12,4);
inc(c);
endinstr;
instr(13,4);
dec(c);
endinstr;
instr(14,7); // BUG FIX
c=fetch(pc),pc++;
endinstr;
instr(15,4);
f=(f&0xc4)|(a&1);
a=(a>>1)|(a<<7);
f|=a&0x28;
endinstr;
instr(16,8);
if(!--b)pc++;
else jr;
endinstr;
instr(17,10);
e=fetch(pc),pc++;
d=fetch(pc),pc++;
#ifdef LOAD_AND_SAVE
if ((pc == SAVE_START_8K) && (!rom4k)) loadAndSaveROM();
#endif
endinstr;
instr(18,7);
store(de,a);
endinstr;
instr(19,6);
if(!++e)d++;
endinstr;
instr(20,4);
inc(d);
endinstr;
instr(21,4);
dec(d);
endinstr;
instr(22,7);
d=fetch(pc),pc++;
endinstr;
instr(23,4);
{int t=a>>7;
a=(a<<1)|(f&1);
f=(f&0xc4)|(a&0x28)|t;
}
endinstr;
instr(24,7);
jr;
endinstr;
instr(25,11);
addhl(d,e);
endinstr;
instr(26,7);
a=fetch(de);
endinstr;
instr(27,6);
if(!e--)d--;
endinstr;
instr(28,4);
inc(e);
endinstr;
instr(29,4);
dec(e);
endinstr;
instr(30,7); // BUG FIX
e=fetch(pc),pc++;
endinstr;
instr(31,4);
{int t=a&1;
a=(a>>1)|(f<<7);
f=(f&0xc4)|(a&0x28)|t;
}
endinstr;
instr(32,7);
if(f&0x40)pc++;
else jr;
endinstr;
instr(33,10);
if(!ixoriy){
l=fetch(pc),pc++;
h=fetch(pc),pc++;
#ifdef LOAD_AND_SAVE
if ((pc == LOAD_SAVE_RET_8K) && (!rom4k)) loadAndSaveROM();
#endif
}
else {
if(ixoriy==1)
ix=fetch2(pc);
else iy=fetch2(pc);
pc+=2;
}
endinstr;
instr(34,16);
{unsigned short addr=fetch2(pc);
pc+=2;
if(!ixoriy)store2b(addr,h,l);
else if(ixoriy==1)store2(addr,ix);
else store2(addr,iy);
}
endinstr;
instr(35,6);
if(!ixoriy){if(!++l)h++;}
else if(ixoriy==1)ix++;
else iy++;
endinstr;
instr(36,4);
if(ixoriy==0)inc(h);
else{unsigned char t;
t=(ixoriy==1?ix:iy)>>8;
inc(t);
if(ixoriy==1)ix=(ix&0xff)|(t<<8);
else iy=(iy&0xff)|(t<<8);
}
endinstr;
instr(37,4);
if(ixoriy==0)dec(h);
else{unsigned char t;
t=(ixoriy==1?ix:iy)>>8;
dec(t);
if(ixoriy==1)ix=(ix&0xff)|(t<<8);
else iy=(iy&0xff)|(t<<8);
}
endinstr;
instr(38,7);
setxh(fetch(pc));
pc++;
endinstr;
instr(39,4);
{
unsigned char incr=0, carry=cy;
if((f&0x10) || (a&0x0f)>9) incr=6;
if((f&1) || (a>>4)>9) incr|=0x60;
if(f&2)suba(incr,0);
else {
if(a>0x90 && (a&15)>9)incr|=0x60;
adda(incr,0);
}
f=((f|carry)&0xfb)|parity(a);
}
endinstr;
instr(40,7);
if(f&0x40)jr;
else pc++;
endinstr;
instr(41,11);
if(!ixoriy)addhl(h,l);
else if(ixoriy==1)addhl((ix>>8),(ix&0xff));
else addhl((iy>>8),(iy&0xff));
endinstr;
instr(42,16);
{unsigned short addr=fetch2(pc);
pc+=2;
if(!ixoriy){
l=fetch(addr);
h=fetch(addr+1);
}
else if(ixoriy==1)ix=fetch2(addr);
else iy=fetch2(addr);
}
endinstr;
instr(43,6);
if(!ixoriy){if(!l--)h--;}
else if(ixoriy==1)ix--;
else iy--;
endinstr;
instr(44,4);
if(!ixoriy)inc(l);
else {unsigned char t;
t=(ixoriy==1?ix:iy);
inc(t);
if(ixoriy==1)ix=(ix&0xff00)|t;
else iy=(iy&0xff00)|t;
}
endinstr;
instr(45,4);
if(!ixoriy)dec(l);
else {unsigned char t;
t=(ixoriy==1?ix:iy);
dec(t);
if(ixoriy==1)ix=(ix&0xff00)|t;
else iy=(iy&0xff00)|t;
}
endinstr;
instr(46,7); // BUG FIX
setxl(fetch(pc));
pc++;
endinstr;
instr(47,4);
a=~a;
f=(f&0xc5)|(a&0x28)|0x12;
endinstr;
instr(48,7);
if(f&1)pc++;
else jr;
endinstr;
instr(49,10);
sp=fetch2(pc);
pc+=2;
endinstr;
instr(50,13);
{unsigned short addr=fetch2(pc);
pc+=2;
store(addr,a);
}
endinstr;
instr(51,6);
sp++;
endinstr;
HLinstr(52,11,8);
{unsigned char t=fetch(addr);
inc(t);
store(addr,t);
}
endinstr;
HLinstr(53,11,8);
{unsigned char t=fetch(addr);
dec(t);
store(addr,t);
}
endinstr;
HLinstr(54,10,5);
store(addr,fetch(pc));
pc++;
endinstr;
instr(55,4);
f=(f&0xc4)|1|(a&0x28);
endinstr;
instr(56,7);
if(f&1)jr;
else pc++;
endinstr;
instr(57,11);
addhl((sp>>8),(sp&0xff));
endinstr;
instr(58,13);
{unsigned short addr=fetch2(pc);
pc+=2;
a=fetch(addr);
}
endinstr;
instr(59,6);
sp--;
endinstr;
instr(60,4);
inc(a);
endinstr;
instr(61,4);
dec(a);
endinstr;
instr(62,7); // BUG FIX
a=fetch(pc),pc++;
endinstr;
instr(63,4);
f=(f&0xc4)|(cy^1)|(cy<<4)|(a&0x28);
endinstr;
instr(0x40,4);
/* ld b,b */
endinstr;
instr(0x41,4);
b=c;
endinstr;
instr(0x42,4);
b=d;
endinstr;
instr(0x43,4);
b=e;
endinstr;
instr(0x44,4);
b=xh;
endinstr;
instr(0x45,4);
b=xl;
endinstr;
HLinstr(0x46,7,8);
b=fetch(addr);
endinstr;
instr(0x47,4);
b=a;
endinstr;
instr(0x48,4);
c=b;
endinstr;
instr(0x49,4);
/* ld c,c */
endinstr;
instr(0x4a,4);
c=d;
endinstr;
instr(0x4b,4);
c=e;
endinstr;
instr(0x4c,4);
c=xh;
endinstr;
instr(0x4d,4);
c=xl;
endinstr;
HLinstr(0x4e,7,8);
c=fetch(addr);
endinstr;
instr(0x4f,4);
c=a;
endinstr;
instr(0x50,4);
d=b;
endinstr;
instr(0x51,4);
d=c;
endinstr;
instr(0x52,4);
/* ld d,d */
endinstr;
instr(0x53,4);
d=e;
endinstr;
instr(0x54,4);
d=xh;
endinstr;
instr(0x55,4);
d=xl;
endinstr;
HLinstr(0x56,7,8);
d=fetch(addr);
endinstr;
instr(0x57,4);
d=a;
endinstr;
instr(0x58,4);
e=b;
endinstr;
instr(0x59,4);
e=c;
endinstr;
instr(0x5a,4);
e=d;
endinstr;
instr(0x5b,4);
/* ld e,e */
endinstr;
instr(0x5c,4);
e=xh;
endinstr;
instr(0x5d,4);
e=xl;
endinstr;
HLinstr(0x5e,7,8);
e=fetch(addr);
endinstr;
instr(0x5f,4);
e=a;
endinstr;
instr(0x60,4);
setxh(b);
endinstr;
instr(0x61,4);
setxh(c);
endinstr;
instr(0x62,4);
setxh(d);
endinstr;
instr(0x63,4);
setxh(e);
endinstr;
instr(0x64,4);
/* ld h,h */
endinstr;
instr(0x65,4);
setxh(xl);
endinstr;
HLinstr(0x66,7,8);
h=fetch(addr);
endinstr;
instr(0x67,4);
setxh(a);
endinstr;
instr(0x68,4);
setxl(b);
endinstr;
instr(0x69,4);
setxl(c);
endinstr;
instr(0x6a,4);
setxl(d);
endinstr;
instr(0x6b,4);
setxl(e);
endinstr;
instr(0x6c,4);
setxl(xh);
endinstr;
instr(0x6d,4);
/* ld l,l */
endinstr;
HLinstr(0x6e,7,8);
l=fetch(addr);
endinstr;
instr(0x6f,4);
setxl(a);
endinstr;
HLinstr(0x70,7,8);
store(addr,b);
endinstr;
HLinstr(0x71,7,8);
store(addr,c);
endinstr;
HLinstr(0x72,7,8);
store(addr,d);
endinstr;
HLinstr(0x73,7,8);
store(addr,e);
endinstr;
HLinstr(0x74,7,8);
store(addr,h);
endinstr;
HLinstr(0x75,7,8);
store(addr,l);
endinstr;
instr(0x76,4);
pc--; /* keep nopping until int */
endinstr;
HLinstr(0x77,7,8);
store(addr,a);
endinstr;
instr(0x78,4);
a=b;
endinstr;
instr(0x79,4);
a=c;
endinstr;
instr(0x7a,4);
a=d;
endinstr;
instr(0x7b,4);
a=e;
endinstr;
instr(0x7c,4);
a=xh;
endinstr;
instr(0x7d,4);
a=xl;
endinstr;
HLinstr(0x7e,7,8);
a=fetch(addr);
endinstr;
instr(0x7f,4);
/* ld a,a */
endinstr;
instr(0x80,4);
adda(b,0);
endinstr;
instr(0x81,4);
adda(c,0);
endinstr;
instr(0x82,4);
adda(d,0);
endinstr;
instr(0x83,4);
adda(e,0);
endinstr;
instr(0x84,4);
adda(xh,0);
endinstr;
instr(0x85,4);
adda(xl,0);
endinstr;
HLinstr(0x86,7,8);
adda(fetch(addr),0);
endinstr;
instr(0x87,4);
adda(a,0);
endinstr;
instr(0x88,4);
adda(b,cy);
endinstr;
instr(0x89,4);
adda(c,cy);
endinstr;
instr(0x8a,4);
adda(d,cy);
endinstr;
instr(0x8b,4);
adda(e,cy);
endinstr;
instr(0x8c,4);
adda(xh,cy);
endinstr;
instr(0x8d,4);
adda(xl,cy);
endinstr;
HLinstr(0x8e,7,8);
adda(fetch(addr),cy);
endinstr;
instr(0x8f,4);
adda(a,cy);
endinstr;
instr(0x90,4);
suba(b,0);
endinstr;
instr(0x91,4);
suba(c,0);
endinstr;
instr(0x92,4);
suba(d,0);
endinstr;
instr(0x93,4);
suba(e,0);
endinstr;
instr(0x94,4);
suba(xh,0);
endinstr;
instr(0x95,4);
suba(xl,0);
endinstr;
HLinstr(0x96,7,8);
suba(fetch(addr),0);
endinstr;
instr(0x97,4);
suba(a,0);
endinstr;
instr(0x98,4);
suba(b,cy);
endinstr;
instr(0x99,4);
suba(c,cy);
endinstr;
instr(0x9a,4);
suba(d,cy);
endinstr;
instr(0x9b,4);
suba(e,cy);
endinstr;
instr(0x9c,4);
suba(xh,cy);
endinstr;
instr(0x9d,4);
suba(xl,cy);
endinstr;
HLinstr(0x9e,7,8);
suba(fetch(addr),cy);
endinstr;
instr(0x9f,4);
suba(a,cy);
endinstr;
instr(0xa0,4);
anda(b);
endinstr;
instr(0xa1,4);
anda(c);
endinstr;
instr(0xa2,4);
anda(d);
endinstr;
instr(0xa3,4);
anda(e);
endinstr;
instr(0xa4,4);
anda(xh);
endinstr;
instr(0xa5,4);
anda(xl);
endinstr;
HLinstr(0xa6,7,8);
anda(fetch(addr));
endinstr;
instr(0xa7,4);
anda(a);
endinstr;
instr(0xa8,4);
xora(b);
endinstr;
instr(0xa9,4);
xora(c);
endinstr;
instr(0xaa,4);
xora(d);
endinstr;
instr(0xab,4);
xora(e);
endinstr;
instr(0xac,4);
xora(xh);
endinstr;
instr(0xad,4);
xora(xl);
endinstr;
HLinstr(0xae,7,8);
xora(fetch(addr));
endinstr;
instr(0xaf,4);
xora(a);
endinstr;
instr(0xb0,4);
ora(b);
endinstr;
instr(0xb1,4);
ora(c);
endinstr;
instr(0xb2,4);
ora(d);
endinstr;
instr(0xb3,4);
ora(e);
endinstr;
instr(0xb4,4);
ora(xh);
endinstr;
instr(0xb5,4);
ora(xl);
endinstr;
HLinstr(0xb6,7,8);
ora(fetch(addr));
endinstr;
instr(0xb7,4);
ora(a);
endinstr;
instr(0xb8,4);
cpa(b);
endinstr;
instr(0xb9,4);
cpa(c);
endinstr;
instr(0xba,4);
cpa(d);
endinstr;
instr(0xbb,4);
cpa(e);
endinstr;
instr(0xbc,4);
cpa(xh);
endinstr;
instr(0xbd,4);
cpa(xl);
endinstr;
HLinstr(0xbe,7,8);
cpa(fetch(addr));
endinstr;
instr(0xbf,4);
cpa(a);
endinstr;
instr(0xc0,5);
if(!(f&0x40))ret;
endinstr;
instr(0xc1,10);
pop1(b,c);
endinstr;
instr(0xc2,10);
if(!(f&0x40))jp;
else pc+=2;