1 /* FCE Ultra - NES/Famicom Emulator
3 * Copyright notice for this file:
4 * Copyright (C) 2002 Ben Parnell
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 extern uint32 PC_prev, OP_prev;
33 extern uint8 dreads[4];
34 extern uint32 dwrites_c[2];
35 extern int dread_count_c, dwrite_count_c;
36 #define DummyRdMem(...)
38 #define DummyRdMem RdMem
43 void FP_FASTAPASS(1) (*MapIRQHook)(int a);
52 //#define _PZ X.PZ // unused?
54 #define _count X.count
55 #define _tcount X.tcount
56 #define _IRQlow X.IRQlow
57 #define _jammed X.jammed
60 static INLINE uint8 RdMem(unsigned int A)
62 // notaz: try to avoid lookup of every address at least for ROM and RAM areas
63 // I've verified that if ARead[0xfff0] points to CartBR, it is always normal ROM read.
65 if ((A&0x8000)/* && ARead[0xfff0] == CartBR*/) {
66 return (_DB=Page[A>>11][A]);
69 #if 0 // enabling this causes 4fps slowdown. Why?
70 if ((A&0xe000) == 0) { // RAM area (always 0-0x1fff)
71 return (_DB=RAM[A&0x7FF]);
76 //printf("a == %x, pc == %x\n", A, _PC);
77 if (A >= 0x2000 && A != _PC && A != _PC - 1 && A != _PC + 1) {
78 dreads[dread_count_c++] = _DB;
79 if (dread_count_c > 4) { printf("dread_count out of range\n"); exit(1); }
85 static INLINE void WrMem(unsigned int A, uint8 V)
87 if ((A&0xe000) == 0) { // RAM area (always 0-0x1fff)
93 dwrites_c[dwrite_count_c++] = (A<<8)|V;
94 if (dwrite_count_c > 2) { printf("dwrite_count_c out of range\n"); exit(1); }
98 static INLINE uint8 RdRAM(unsigned int A)
100 return((_DB=RAM[A]));
103 static INLINE void WrRAM(unsigned int A, uint8 V)
108 static INLINE void ADDCYC(int x)
115 void FASTAPASS(1) X6502_AddCycles_c(int x)
120 static INLINE void PUSH(uint8 V)
126 static INLINE uint8 POP(void)
129 return(RdRAM(0x100+_S));
133 static uint8 ZNTable[256] = {
134 Z_FLAG,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
135 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
136 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
137 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
138 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
139 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
140 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
141 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
142 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
143 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
144 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
145 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
146 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
147 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
148 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,
149 N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG,N_FLAG
152 /* Some of these operations will only make sense if you know what the flag
154 //#define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);_P|=ZNTable[zort]
155 //#define X_ZNT(zort) _P|=ZNTable[zort]
156 #define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);if(!zort) _P|=Z_FLAG;else _P|=zort&N_FLAG
157 #define X_ZNT(zort) if(!zort) _P|=Z_FLAG;else _P|=(zort&N_FLAG)
159 /* Care must be taken if you want to turn this into a macro. Use { and }. */
168 if((tmp^_PC)&0x100) \
172 #define LDA _A=x;X_ZN(_A)
173 #define LDX _X=x;X_ZN(_X)
174 #define LDY _Y=x;X_ZN(_Y)
176 /* All of the freaky arithmetic operations. */
177 #define AND _A&=x;X_ZN(_A)
178 //#define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);_P|=ZNTable[x&_A]&Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
179 #define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);if(!(x&_A)) _P|=Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
180 #define EOR _A^=x;X_ZN(_A)
181 #define ORA _A|=x;X_ZN(_A)
184 uint32 l=_A+x+(_P&1); \
185 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
186 _P|=((((_A^x)&0x80)^0x80) & ((_A^l)&0x80))>>1; \
192 uint32 l=_A-x-((_P&1)^1); \
193 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
194 _P|=((_A^l)&(_A^x)&0x80)>>1; \
195 _P|=((l>>8)&C_FLAG)^C_FLAG; \
200 #define CMPL(a1,a2) { \
204 _P|=((t>>8)&C_FLAG)^C_FLAG; \
207 /* Special undocumented operation. Very similar to CMP. */
209 uint32 t=(_A&_X)-x; \
212 _P|=((t>>8)&C_FLAG)^C_FLAG; \
216 #define CMP CMPL(_A,x)
217 #define CPX CMPL(_X,x)
218 #define CPY CMPL(_Y,x)
220 /* The following operations modify the byte being worked on. */
221 #define DEC x--;X_ZN(x)
222 #define INC x++;X_ZN(x)
224 #define ASL _P&=~C_FLAG;_P|=x>>7;x<<=1;X_ZN(x)
225 #define LSR _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=x&1;x>>=1;X_ZNT(x)
227 /* For undocumented instructions, maybe for other things later... */
228 #define LSRA _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=_A&1;_A>>=1;X_ZNT(_A)
234 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
242 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
247 /* Icky icky thing for some undocumented instructions. Can easily be
248 broken if names of local variables are changed.
252 #define GetAB(target) \
254 target=RdMem(_PC++); \
255 target|=RdMem(_PC++)<<8; \
258 /* Absolute Indexed(for reads) */
259 #define GetABIRD(target, i) \
265 if((target^tmp)&0x100) \
268 DummyRdMem(target^0x100); \
273 /* Absolute Indexed(for writes and rmws) */
274 #define GetABIWR(target, i) \
281 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
285 #define GetZP(target) \
287 target=RdMem(_PC++); \
290 /* Zero Page Indexed */
291 #define GetZPI(target,i) \
293 target=i+RdMem(_PC++); \
296 /* Indexed Indirect */
297 #define GetIX(target) \
302 target=RdRAM(tmp++); \
303 target|=RdRAM(tmp)<<8; \
306 /* Indirect Indexed(for reads) */
307 #define GetIYRD(target) \
316 if((target^rt)&0x100) \
319 DummyRdMem(target^0x100); \
324 /* Indirect Indexed(for writes and rmws) */
325 #define GetIYWR(target) \
334 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
337 /* Now come the macros to wrap up all of the above stuff addressing mode functions
338 and operation macros. Note that operation macros will always operate(redundant
339 redundant) on the variable "x".
342 #define RMW_A(op) {uint8 x=_A; op; _A=x; break; } /* Meh... */
343 #define RMW_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
344 #define RMW_ABI(reg,op) {unsigned int A; uint8 x; GetABIWR(A,reg); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
345 #define RMW_ABX(op) RMW_ABI(_X,op)
346 #define RMW_ABY(op) RMW_ABI(_Y,op)
347 #define RMW_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
348 #define RMW_IY(op) {unsigned int A; uint8 x; GetIYWR(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
349 #define RMW_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; WrRAM(A,x); break; }
350 #define RMW_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; WrRAM(A,x); break;}
352 #define LD_IM(op) {uint8 x; x=RdMem(_PC++); op; break;}
353 #define LD_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; break;}
354 #define LD_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; break;}
355 #define LD_ZPY(op) {uint8 A; uint8 x; GetZPI(A,_Y); x=RdRAM(A); op; break;}
356 #define LD_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); op; break; }
357 #define LD_ABI(reg,op) {unsigned int A; uint8 x; GetABIRD(A,reg); x=RdMem(A); op; break;}
358 #define LD_ABX(op) LD_ABI(_X,op)
359 #define LD_ABY(op) LD_ABI(_Y,op)
360 #define LD_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); op; break;}
361 #define LD_IY(op) {unsigned int A; uint8 x; GetIYRD(A); x=RdMem(A); op; break;}
363 #define ST_ZP(r) {uint8 A; GetZP(A); WrRAM(A,r); break;}
364 #define ST_ZPX(r) {uint8 A; GetZPI(A,_X); WrRAM(A,r); break;}
365 #define ST_ZPY(r) {uint8 A; GetZPI(A,_Y); WrRAM(A,r); break;}
366 #define ST_AB(r) {unsigned int A; GetAB(A); WrMem(A,r); break;}
367 #define ST_ABI(reg,r) {unsigned int A; GetABIWR(A,reg); WrMem(A,r); break; }
368 #define ST_ABX(r) ST_ABI(_X,r)
369 #define ST_ABY(r) ST_ABI(_Y,r)
370 #define ST_IX(r) {unsigned int A; GetIX(A); WrMem(A,r); break; }
371 #define ST_IY(r) {unsigned int A; GetIYWR(A); WrMem(A,r); break; }
373 static uint8 CycTable[256] =
375 /*0x00*/ 7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,
376 /*0x10*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
377 /*0x20*/ 6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,
378 /*0x30*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
379 /*0x40*/ 6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,
380 /*0x50*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
381 /*0x60*/ 6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,
382 /*0x70*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
383 /*0x80*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
384 /*0x90*/ 2,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,
385 /*0xA0*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
386 /*0xB0*/ 2,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,
387 /*0xC0*/ 2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,
388 /*0xD0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
389 /*0xE0*/ 2,6,3,8,3,3,5,5,2,2,2,2,4,4,6,6,
390 /*0xF0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
393 void FASTAPASS(1) X6502_IRQBegin_c(int w)
398 void FASTAPASS(1) X6502_IRQEnd_c(int w)
403 void TriggerIRQ_c(void) /* This function should probably be phased out. */
405 _IRQlow|=FCEU_IQTEMP;
408 void TriggerNMINSF_c(void)
413 PUSH((_P&~B_FLAG)|(U_FLAG));
417 void TriggerNMI_c(void)
422 static void TriggerNMIReal(void)
432 _PC|=RdMem(0xFFFB)<<8;
433 #ifdef DEBUG_ASM_6502
440 void TriggerIRQReal(void)
442 if(!(_PI&I_FLAG) && !_jammed)
451 _PC|=RdMem(0xFFFF)<<8;
452 #ifdef DEBUG_ASM_6502
459 void X6502_Reset_c(void)
462 _PC|=RdMem(0xFFFD)<<8;
463 if(FCEUGameInfo.type==GIT_NSF) _PC=0x3830;
468 void X6502_Power_c(void)
470 memset((void *)&X,0,sizeof(X));
477 void X6502_Run_c(void/*int32 cycles*/)
481 cycles*=15; // 15*4=60
483 cycles*=16; // 16*4=64
487 // if (_count <= 0) asdc++;
496 if(_IRQlow&FCEU_IQNMI)
501 _IRQlow&=~(FCEU_IQTEMP|FCEU_IQNMI);
502 if(_count<=0) {_PI=_P;return;} /* Should increase accuracy without a */
503 /* major speed hit. */
512 if(MapIRQHook) MapIRQHook(temp);
529 if((PSG[0x10]&0x80) && !(PSG[0x10]&0x40))
531 extern uint8 SIRQStat;
533 X6502_IRQBegin_c(FCEU_IQDPCM);
538 #ifdef DEBUG_ASM_6502
542 //printf("$%04x:$%02x\n",_PC,b1);
544 //printf("$%02x\n",b1);
551 #ifdef DEBUG_ASM_6502