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
35 extern uint32 PC_prev, OP_prev;
36 extern uint8 dreads[4];
37 extern uint32 dwrites_c[2];
38 extern int dread_count_c, dwrite_count_c;
39 extern int mapirq_cyc_c;
40 extern void (*MapIRQHook)(int a);
41 #define DummyRdMem(...)
43 #define DummyRdMem RdMem
44 void FP_FASTAPASS(1) (*MapIRQHook)(int a);
57 //#define _PZ X.PZ // unused?
59 #define _count X.count
60 #define _tcount X.tcount
61 #define _IRQlow X.IRQlow
62 #define _jammed X.jammed
65 static INLINE uint8 RdMem(unsigned int A)
70 //printf("a == %x, pc == %x\n", A, _PC);
72 if (A == _PC || A == _PC - 1 || A == _PC + 1) {
73 //printf("fr: %02x\n", _DB1);
77 if (A >= 0x2000 && A != _PC - 1) {
78 dreads[dread_count_c++] = _DB1;
79 if (dread_count_c > 4) { printf("dread_count out of range\n"); exit(1); }
87 static INLINE void WrMem(unsigned int A, uint8 V)
89 //printf("w [%04x] %02x\n", A, V);
90 if ((A&0xe000) == 0) { // RAM area (always 0-0x1fff)
96 dwrites_c[dwrite_count_c++] = (A<<8)|V;
97 if (dwrite_count_c > 2) { printf("dwrite_count_c out of range\n"); exit(1); }
101 static INLINE uint8 RdRAM(unsigned int A)
103 //return((_DB=RAM[A]));
105 #ifndef DEBUG_ASM_6502
111 static INLINE void WrRAM(unsigned int A, uint8 V)
116 static INLINE void ADDCYC(int x)
123 void FASTAPASS(1) X6502_AddCycles_c(int x)
128 static INLINE void PUSH(uint8 V)
134 static INLINE uint8 POP(void)
137 return(RdRAM(0x100+_S));
141 static uint8 ZNTable[256] = {
142 Z_FLAG,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 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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,
157 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
160 /* Some of these operations will only make sense if you know what the flag
162 //#define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);_P|=ZNTable[zort]
163 //#define X_ZNT(zort) _P|=ZNTable[zort]
164 #define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);if(!zort) _P|=Z_FLAG;else _P|=zort&N_FLAG
165 #define X_ZNT(zort) if(!zort) _P|=Z_FLAG;else _P|=(zort&N_FLAG)
167 /* Care must be taken if you want to turn this into a macro. Use { and }. */
176 if((tmp^_PC)&0x100) \
180 #define LDA _A=x;X_ZN(_A)
181 #define LDX _X=x;X_ZN(_X)
182 #define LDY _Y=x;X_ZN(_Y)
184 /* All of the freaky arithmetic operations. */
185 #define AND _A&=x;X_ZN(_A)
186 //#define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);_P|=ZNTable[x&_A]&Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
187 #define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);if(!(x&_A)) _P|=Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
188 #define EOR _A^=x;X_ZN(_A)
189 #define ORA _A|=x;X_ZN(_A)
192 uint32 l=_A+x+(_P&1); \
193 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
194 _P|=((((_A^x)&0x80)^0x80) & ((_A^l)&0x80))>>1; \
200 uint32 l=_A-x-((_P&1)^1); \
201 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
202 _P|=((_A^l)&(_A^x)&0x80)>>1; \
203 _P|=((l>>8)&C_FLAG)^C_FLAG; \
208 #define CMPL(a1,a2) { \
212 _P|=((t>>8)&C_FLAG)^C_FLAG; \
215 /* Special undocumented operation. Very similar to CMP. */
217 uint32 t=(_A&_X)-x; \
220 _P|=((t>>8)&C_FLAG)^C_FLAG; \
224 #define CMP CMPL(_A,x)
225 #define CPX CMPL(_X,x)
226 #define CPY CMPL(_Y,x)
228 /* The following operations modify the byte being worked on. */
229 #define DEC x--;X_ZN(x)
230 #define INC x++;X_ZN(x)
232 #define ASL _P&=~C_FLAG;_P|=x>>7;x<<=1;X_ZN(x)
233 #define LSR _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=x&1;x>>=1;X_ZNT(x)
235 /* For undocumented instructions, maybe for other things later... */
236 #define LSRA _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=_A&1;_A>>=1;X_ZNT(_A)
242 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
250 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
255 /* Icky icky thing for some undocumented instructions. Can easily be
256 broken if names of local variables are changed.
260 #define GetAB(target) \
262 target=RdMem(_PC++); \
263 target|=RdMem(_PC++)<<8; \
266 /* Absolute Indexed(for reads) */
267 #define GetABIRD(target, i) \
273 if((target^tmp)&0x100) \
276 DummyRdMem(target^0x100); \
281 /* Absolute Indexed(for writes and rmws) */
282 #define GetABIWR(target, i) \
289 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
293 #define GetZP(target) \
295 target=RdMem(_PC++); \
298 /* Zero Page Indexed */
299 #define GetZPI(target,i) \
301 target=i+RdMem(_PC++); \
304 /* Indexed Indirect */
305 #define GetIX(target) \
310 target=RdRAM(tmp++); \
311 target|=RdRAM(tmp)<<8; \
314 /* Indirect Indexed(for reads) */
315 #define GetIYRD(target) \
324 if((target^rt)&0x100) \
327 DummyRdMem(target^0x100); \
332 /* Indirect Indexed(for writes and rmws) */
333 #define GetIYWR(target) \
342 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
345 /* Now come the macros to wrap up all of the above stuff addressing mode functions
346 and operation macros. Note that operation macros will always operate(redundant
347 redundant) on the variable "x".
350 #define RMW_A(op) {uint8 x=_A; op; _A=x; break; } /* Meh... */
351 #define RMW_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
352 #define RMW_ABI(reg,op) {unsigned int A; uint8 x; GetABIWR(A,reg); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
353 #define RMW_ABX(op) RMW_ABI(_X,op)
354 #define RMW_ABY(op) RMW_ABI(_Y,op)
355 #define RMW_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
356 #define RMW_IY(op) {unsigned int A; uint8 x; GetIYWR(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
357 #define RMW_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; WrRAM(A,x); break; }
358 #define RMW_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; WrRAM(A,x); break;}
360 #define LD_IM(op) {uint8 x; x=RdMem(_PC++); op; break;}
361 #define LD_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; break;}
362 #define LD_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; break;}
363 #define LD_ZPY(op) {uint8 A; uint8 x; GetZPI(A,_Y); x=RdRAM(A); op; break;}
364 #define LD_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); op; break; }
365 #define LD_ABI(reg,op) {unsigned int A; uint8 x; GetABIRD(A,reg); x=RdMem(A); op; break;}
366 #define LD_ABX(op) LD_ABI(_X,op)
367 #define LD_ABY(op) LD_ABI(_Y,op)
368 #define LD_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); op; break;}
369 #define LD_IY(op) {unsigned int A; uint8 x; GetIYRD(A); x=RdMem(A); op; break;}
371 #define ST_ZP(r) {uint8 A; GetZP(A); WrRAM(A,r); break;}
372 #define ST_ZPX(r) {uint8 A; GetZPI(A,_X); WrRAM(A,r); break;}
373 #define ST_ZPY(r) {uint8 A; GetZPI(A,_Y); WrRAM(A,r); break;}
374 #define ST_AB(r) {unsigned int A; GetAB(A); WrMem(A,r); break;}
375 #define ST_ABI(reg,r) {unsigned int A; GetABIWR(A,reg); WrMem(A,r); break; }
376 #define ST_ABX(r) ST_ABI(_X,r)
377 #define ST_ABY(r) ST_ABI(_Y,r)
378 #define ST_IX(r) {unsigned int A; GetIX(A); WrMem(A,r); break; }
379 #define ST_IY(r) {unsigned int A; GetIYWR(A); WrMem(A,r); break; }
381 static uint8 CycTable[256] =
383 /* 0 1 2 3 4 5 6 7 8 9 a b c d e f */
384 /*0x00*/ 7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,
385 /*0x10*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
386 /*0x20*/ 6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,
387 /*0x30*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
388 /*0x40*/ 6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,
389 /*0x50*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
390 /*0x60*/ 6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,
391 /*0x70*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
392 /*0x80*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
393 /*0x90*/ 2,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,
394 /*0xA0*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
395 /*0xB0*/ 2,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,
396 /*0xC0*/ 2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,
397 /*0xD0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
398 /*0xE0*/ 2,6,3,8,3,3,5,5,2,2,2,2,4,4,6,6,
399 /*0xF0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
402 void FASTAPASS(1) X6502_IRQBegin_c(int w)
404 dprintf("IRQB %02x",w);
408 void FASTAPASS(1) X6502_IRQEnd_c(int w)
410 dprintf("IRQE %02x",w);
414 void TriggerIRQ_c(void) /* This function should probably be phased out. */
416 _IRQlow|=FCEU_IQTEMP;
419 void TriggerNMI_c(void)
424 static void TriggerNMIReal(void)
435 _PC|=RdMem(0xFFFB)<<8;
436 #ifdef DEBUG_ASM_6502
443 void TriggerIRQReal(void)
445 if(!(_PI&I_FLAG) && !_jammed)
455 _PC|=RdMem(0xFFFF)<<8;
456 #ifdef DEBUG_ASM_6502
463 void X6502_Reset_c(void)
466 _PC|=RdMem(0xFFFD)<<8;
471 void X6502_Power_c(void)
473 memset((void *)&X,0,sizeof(X));
480 void X6502_Run_c(void/*int32 cycles*/)
484 cycles*=15; // 15*4=60
486 cycles*=16; // 16*4=64
490 // if (_count <= 0) asdc++;
499 if(_IRQlow&FCEU_IQNMI)
504 _IRQlow&=~(FCEU_IQTEMP|FCEU_IQNMI);
507 #ifdef DEBUG_ASM_6502
508 if(MapIRQHook) mapirq_cyc_c = _tcount;
512 return; /* Should increase accuracy without a major speed hit. */
516 #ifdef DEBUG_ASM_6502
517 b1=RdMem(_PC++); _PC--;
521 ADDCYC(CycTable[b1]);
525 FCEU_SoundCPUHook098(temp);
543 if((PSG[0x10]&0x80) && !(PSG[0x10]&0x40))
545 extern uint8 SIRQStat;
547 X6502_IRQBegin(FCEU_IQDPCM);
553 #ifdef DEBUG_ASM_6502
557 //printf("$%04x:$%02x\n",_PC,b1);
559 //printf("$%02x\n",b1);
566 temp=_tcount; /* Gradius II (J) glitches if _tcount is not used */
570 #ifdef DEBUG_ASM_6502
576 #ifdef DEBUG_ASM_6502