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
34 extern uint32 PC_prev, OP_prev;
35 extern uint8 dreads[4];
36 extern uint32 dwrites_c[2];
37 extern int dread_count_c, dwrite_count_c;
38 extern int mapirq_cyc_c;
39 extern void (*MapIRQHook)(int a);
40 #define DummyRdMem(...)
42 #define DummyRdMem RdMem
43 void FP_FASTAPASS(1) (*MapIRQHook)(int a);
56 //#define _PZ X.PZ // unused?
58 #define _count X.count
59 #define _tcount X.tcount
60 #define _IRQlow X.IRQlow
61 #define _jammed X.jammed
64 static INLINE uint8 RdMem(unsigned int A)
69 //printf("a == %x, pc == %x\n", A, _PC);
71 if (A == _PC || A == _PC - 1 || A == _PC + 1) {
72 //printf("fr: %02x\n", _DB1);
76 if (A >= 0x2000 && A != _PC - 1) {
77 dreads[dread_count_c++] = _DB1;
78 if (dread_count_c > 4) { printf("dread_count out of range\n"); exit(1); }
86 static INLINE void WrMem(unsigned int A, uint8 V)
88 //printf("w [%04x] %02x\n", A, V);
89 if ((A&0xe000) == 0) { // RAM area (always 0-0x1fff)
95 dwrites_c[dwrite_count_c++] = (A<<8)|V;
96 if (dwrite_count_c > 2) { printf("dwrite_count_c out of range\n"); exit(1); }
100 static INLINE uint8 RdRAM(unsigned int A)
102 //return((_DB=RAM[A]));
104 #ifndef DEBUG_ASM_6502
110 static INLINE void WrRAM(unsigned int A, uint8 V)
115 static INLINE void ADDCYC(int x)
122 void FASTAPASS(1) X6502_AddCycles_c(int x)
127 static INLINE void PUSH(uint8 V)
133 static INLINE uint8 POP(void)
136 return(RdRAM(0x100+_S));
140 static uint8 ZNTable[256] = {
141 Z_FLAG,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
142 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
143 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
144 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
145 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
146 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
147 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
148 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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,
150 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,
151 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 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,
153 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,
154 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,
155 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,
156 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
159 /* Some of these operations will only make sense if you know what the flag
161 //#define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);_P|=ZNTable[zort]
162 //#define X_ZNT(zort) _P|=ZNTable[zort]
163 #define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);if(!zort) _P|=Z_FLAG;else _P|=zort&N_FLAG
164 #define X_ZNT(zort) if(!zort) _P|=Z_FLAG;else _P|=(zort&N_FLAG)
166 /* Care must be taken if you want to turn this into a macro. Use { and }. */
175 if((tmp^_PC)&0x100) \
179 #define LDA _A=x;X_ZN(_A)
180 #define LDX _X=x;X_ZN(_X)
181 #define LDY _Y=x;X_ZN(_Y)
183 /* All of the freaky arithmetic operations. */
184 #define AND _A&=x;X_ZN(_A)
185 //#define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);_P|=ZNTable[x&_A]&Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
186 #define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);if(!(x&_A)) _P|=Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
187 #define EOR _A^=x;X_ZN(_A)
188 #define ORA _A|=x;X_ZN(_A)
191 uint32 l=_A+x+(_P&1); \
192 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
193 _P|=((((_A^x)&0x80)^0x80) & ((_A^l)&0x80))>>1; \
199 uint32 l=_A-x-((_P&1)^1); \
200 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
201 _P|=((_A^l)&(_A^x)&0x80)>>1; \
202 _P|=((l>>8)&C_FLAG)^C_FLAG; \
207 #define CMPL(a1,a2) { \
211 _P|=((t>>8)&C_FLAG)^C_FLAG; \
214 /* Special undocumented operation. Very similar to CMP. */
216 uint32 t=(_A&_X)-x; \
219 _P|=((t>>8)&C_FLAG)^C_FLAG; \
223 #define CMP CMPL(_A,x)
224 #define CPX CMPL(_X,x)
225 #define CPY CMPL(_Y,x)
227 /* The following operations modify the byte being worked on. */
228 #define DEC x--;X_ZN(x)
229 #define INC x++;X_ZN(x)
231 #define ASL _P&=~C_FLAG;_P|=x>>7;x<<=1;X_ZN(x)
232 #define LSR _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=x&1;x>>=1;X_ZNT(x)
234 /* For undocumented instructions, maybe for other things later... */
235 #define LSRA _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=_A&1;_A>>=1;X_ZNT(_A)
241 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
249 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
254 /* Icky icky thing for some undocumented instructions. Can easily be
255 broken if names of local variables are changed.
259 #define GetAB(target) \
261 target=RdMem(_PC++); \
262 target|=RdMem(_PC++)<<8; \
265 /* Absolute Indexed(for reads) */
266 #define GetABIRD(target, i) \
272 if((target^tmp)&0x100) \
275 DummyRdMem(target^0x100); \
280 /* Absolute Indexed(for writes and rmws) */
281 #define GetABIWR(target, i) \
288 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
292 #define GetZP(target) \
294 target=RdMem(_PC++); \
297 /* Zero Page Indexed */
298 #define GetZPI(target,i) \
300 target=i+RdMem(_PC++); \
303 /* Indexed Indirect */
304 #define GetIX(target) \
309 target=RdRAM(tmp++); \
310 target|=RdRAM(tmp)<<8; \
313 /* Indirect Indexed(for reads) */
314 #define GetIYRD(target) \
323 if((target^rt)&0x100) \
326 DummyRdMem(target^0x100); \
331 /* Indirect Indexed(for writes and rmws) */
332 #define GetIYWR(target) \
341 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
344 /* Now come the macros to wrap up all of the above stuff addressing mode functions
345 and operation macros. Note that operation macros will always operate(redundant
346 redundant) on the variable "x".
349 #define RMW_A(op) {uint8 x=_A; op; _A=x; break; } /* Meh... */
350 #define RMW_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
351 #define RMW_ABI(reg,op) {unsigned int A; uint8 x; GetABIWR(A,reg); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
352 #define RMW_ABX(op) RMW_ABI(_X,op)
353 #define RMW_ABY(op) RMW_ABI(_Y,op)
354 #define RMW_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
355 #define RMW_IY(op) {unsigned int A; uint8 x; GetIYWR(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
356 #define RMW_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; WrRAM(A,x); break; }
357 #define RMW_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; WrRAM(A,x); break;}
359 #define LD_IM(op) {uint8 x; x=RdMem(_PC++); op; break;}
360 #define LD_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; break;}
361 #define LD_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; break;}
362 #define LD_ZPY(op) {uint8 A; uint8 x; GetZPI(A,_Y); x=RdRAM(A); op; break;}
363 #define LD_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); op; break; }
364 #define LD_ABI(reg,op) {unsigned int A; uint8 x; GetABIRD(A,reg); x=RdMem(A); op; break;}
365 #define LD_ABX(op) LD_ABI(_X,op)
366 #define LD_ABY(op) LD_ABI(_Y,op)
367 #define LD_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); op; break;}
368 #define LD_IY(op) {unsigned int A; uint8 x; GetIYRD(A); x=RdMem(A); op; break;}
370 #define ST_ZP(r) {uint8 A; GetZP(A); WrRAM(A,r); break;}
371 #define ST_ZPX(r) {uint8 A; GetZPI(A,_X); WrRAM(A,r); break;}
372 #define ST_ZPY(r) {uint8 A; GetZPI(A,_Y); WrRAM(A,r); break;}
373 #define ST_AB(r) {unsigned int A; GetAB(A); WrMem(A,r); break;}
374 #define ST_ABI(reg,r) {unsigned int A; GetABIWR(A,reg); WrMem(A,r); break; }
375 #define ST_ABX(r) ST_ABI(_X,r)
376 #define ST_ABY(r) ST_ABI(_Y,r)
377 #define ST_IX(r) {unsigned int A; GetIX(A); WrMem(A,r); break; }
378 #define ST_IY(r) {unsigned int A; GetIYWR(A); WrMem(A,r); break; }
380 static uint8 CycTable[256] =
382 /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
383 /*0x00*/ 7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,
384 /*0x10*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
385 /*0x20*/ 6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,
386 /*0x30*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
387 /*0x40*/ 6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,
388 /*0x50*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
389 /*0x60*/ 6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,
390 /*0x70*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
391 /*0x80*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
392 /*0x90*/ 2,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,
393 /*0xA0*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
394 /*0xB0*/ 2,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,
395 /*0xC0*/ 2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,
396 /*0xD0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
397 /*0xE0*/ 2,6,3,8,3,3,5,5,2,2,2,2,4,4,6,6,
398 /*0xF0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
401 void FASTAPASS(1) X6502_IRQBegin_c(int w)
403 dprintf("IRQB %02x",w);
407 void FASTAPASS(1) X6502_IRQEnd_c(int w)
409 dprintf("IRQE %02x",w);
413 void TriggerIRQ_c(void) /* This function should probably be phased out. */
415 _IRQlow|=FCEU_IQTEMP;
418 void TriggerNMI_c(void)
423 static void TriggerNMIReal(void)
434 _PC|=RdMem(0xFFFB)<<8;
435 #ifdef DEBUG_ASM_6502
442 void TriggerIRQReal(void)
444 if(!(_PI&I_FLAG) && !_jammed)
454 _PC|=RdMem(0xFFFF)<<8;
455 #ifdef DEBUG_ASM_6502
462 void X6502_Reset_c(void)
465 _PC|=RdMem(0xFFFD)<<8;
470 void X6502_Power_c(void)
472 memset((void *)&X,0,sizeof(X));
479 void X6502_Run_c(void/*int32 cycles*/)
483 cycles*=15; // 15*4=60
485 cycles*=16; // 16*4=64
489 // if (_count <= 0) asdc++;
498 if(_IRQlow&FCEU_IQNMI)
503 _IRQlow&=~(FCEU_IQTEMP|FCEU_IQNMI);
506 #ifdef DEBUG_ASM_6502
507 if(MapIRQHook) mapirq_cyc_c = _tcount;
511 return; /* Should increase accuracy without a major speed hit. */
515 #ifdef DEBUG_ASM_6502
516 b1=RdMem(_PC++); _PC--;
520 ADDCYC(CycTable[b1]);
538 if((PSG[0x10]&0x80) && !(PSG[0x10]&0x40))
540 extern uint8 SIRQStat;
542 X6502_IRQBegin(FCEU_IQDPCM);
547 #ifdef DEBUG_ASM_6502
551 //printf("$%04x:$%02x\n",_PC,b1);
553 //printf("$%02x\n",b1);
560 temp=_tcount; /* Gradius II (J) glitches if _tcount is not used */
564 #ifdef DEBUG_ASM_6502
570 #ifdef DEBUG_ASM_6502