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 extern int mapirq_cyc_c;
37 extern void (*MapIRQHook)(int a);
38 #define DummyRdMem(...)
40 #define DummyRdMem RdMem
41 void FP_FASTAPASS(1) (*MapIRQHook)(int a);
54 //#define _PZ X.PZ // unused?
56 #define _count X.count
57 #define _tcount X.tcount
58 #define _IRQlow X.IRQlow
59 #define _jammed X.jammed
62 static INLINE uint8 RdMem(unsigned int A)
64 // notaz: try to avoid lookup of every address at least for ROM and RAM areas
65 // I've verified that if ARead[0xfff0] points to CartBR, it is always normal ROM read.
67 if ((A&0x8000)/* && ARead[0xfff0] == CartBR*/) {
68 return (_DB=Page[A>>11][A]);
71 #if 0 // enabling this causes 4fps slowdown. Why?
72 if ((A&0xe000) == 0) { // RAM area (always 0-0x1fff)
73 return (_DB=RAM[A&0x7FF]);
78 //printf("a == %x, pc == %x\n", A, _PC);
79 if (A >= 0x2000 && A != _PC && A != _PC - 1 && A != _PC + 1) {
80 dreads[dread_count_c++] = _DB;
81 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]));
106 static INLINE void WrRAM(unsigned int A, uint8 V)
111 static INLINE void ADDCYC(int x)
118 void FASTAPASS(1) X6502_AddCycles_c(int x)
123 static INLINE void PUSH(uint8 V)
129 static INLINE uint8 POP(void)
132 return(RdRAM(0x100+_S));
136 static uint8 ZNTable[256] = {
137 Z_FLAG,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 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 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,
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
155 /* Some of these operations will only make sense if you know what the flag
157 //#define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);_P|=ZNTable[zort]
158 //#define X_ZNT(zort) _P|=ZNTable[zort]
159 #define X_ZN(zort) _P&=~(Z_FLAG|N_FLAG);if(!zort) _P|=Z_FLAG;else _P|=zort&N_FLAG
160 #define X_ZNT(zort) if(!zort) _P|=Z_FLAG;else _P|=(zort&N_FLAG)
162 /* Care must be taken if you want to turn this into a macro. Use { and }. */
171 if((tmp^_PC)&0x100) \
175 #define LDA _A=x;X_ZN(_A)
176 #define LDX _X=x;X_ZN(_X)
177 #define LDY _Y=x;X_ZN(_Y)
179 /* All of the freaky arithmetic operations. */
180 #define AND _A&=x;X_ZN(_A)
181 //#define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);_P|=ZNTable[x&_A]&Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
182 #define BIT _P&=~(Z_FLAG|V_FLAG|N_FLAG);if(!(x&_A)) _P|=Z_FLAG;_P|=x&(V_FLAG|N_FLAG)
183 #define EOR _A^=x;X_ZN(_A)
184 #define ORA _A|=x;X_ZN(_A)
187 uint32 l=_A+x+(_P&1); \
188 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
189 _P|=((((_A^x)&0x80)^0x80) & ((_A^l)&0x80))>>1; \
195 uint32 l=_A-x-((_P&1)^1); \
196 _P&=~(Z_FLAG|C_FLAG|N_FLAG|V_FLAG); \
197 _P|=((_A^l)&(_A^x)&0x80)>>1; \
198 _P|=((l>>8)&C_FLAG)^C_FLAG; \
203 #define CMPL(a1,a2) { \
207 _P|=((t>>8)&C_FLAG)^C_FLAG; \
210 /* Special undocumented operation. Very similar to CMP. */
212 uint32 t=(_A&_X)-x; \
215 _P|=((t>>8)&C_FLAG)^C_FLAG; \
219 #define CMP CMPL(_A,x)
220 #define CPX CMPL(_X,x)
221 #define CPY CMPL(_Y,x)
223 /* The following operations modify the byte being worked on. */
224 #define DEC x--;X_ZN(x)
225 #define INC x++;X_ZN(x)
227 #define ASL _P&=~C_FLAG;_P|=x>>7;x<<=1;X_ZN(x)
228 #define LSR _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=x&1;x>>=1;X_ZNT(x)
230 /* For undocumented instructions, maybe for other things later... */
231 #define LSRA _P&=~(C_FLAG|N_FLAG|Z_FLAG);_P|=_A&1;_A>>=1;X_ZNT(_A)
237 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
245 _P&=~(Z_FLAG|N_FLAG|C_FLAG); \
250 /* Icky icky thing for some undocumented instructions. Can easily be
251 broken if names of local variables are changed.
255 #define GetAB(target) \
257 target=RdMem(_PC++); \
258 target|=RdMem(_PC++)<<8; \
261 /* Absolute Indexed(for reads) */
262 #define GetABIRD(target, i) \
268 if((target^tmp)&0x100) \
271 DummyRdMem(target^0x100); \
276 /* Absolute Indexed(for writes and rmws) */
277 #define GetABIWR(target, i) \
284 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
288 #define GetZP(target) \
290 target=RdMem(_PC++); \
293 /* Zero Page Indexed */
294 #define GetZPI(target,i) \
296 target=i+RdMem(_PC++); \
299 /* Indexed Indirect */
300 #define GetIX(target) \
305 target=RdRAM(tmp++); \
306 target|=RdRAM(tmp)<<8; \
309 /* Indirect Indexed(for reads) */
310 #define GetIYRD(target) \
319 if((target^rt)&0x100) \
322 DummyRdMem(target^0x100); \
327 /* Indirect Indexed(for writes and rmws) */
328 #define GetIYWR(target) \
337 DummyRdMem((target&0x00FF)|(rt&0xFF00)); \
340 /* Now come the macros to wrap up all of the above stuff addressing mode functions
341 and operation macros. Note that operation macros will always operate(redundant
342 redundant) on the variable "x".
345 #define RMW_A(op) {uint8 x=_A; op; _A=x; break; } /* Meh... */
346 #define RMW_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
347 #define RMW_ABI(reg,op) {unsigned int A; uint8 x; GetABIWR(A,reg); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
348 #define RMW_ABX(op) RMW_ABI(_X,op)
349 #define RMW_ABY(op) RMW_ABI(_Y,op)
350 #define RMW_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
351 #define RMW_IY(op) {unsigned int A; uint8 x; GetIYWR(A); x=RdMem(A); WrMem(A,x); op; WrMem(A,x); break; }
352 #define RMW_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; WrRAM(A,x); break; }
353 #define RMW_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; WrRAM(A,x); break;}
355 #define LD_IM(op) {uint8 x; x=RdMem(_PC++); op; break;}
356 #define LD_ZP(op) {uint8 A; uint8 x; GetZP(A); x=RdRAM(A); op; break;}
357 #define LD_ZPX(op) {uint8 A; uint8 x; GetZPI(A,_X); x=RdRAM(A); op; break;}
358 #define LD_ZPY(op) {uint8 A; uint8 x; GetZPI(A,_Y); x=RdRAM(A); op; break;}
359 #define LD_AB(op) {unsigned int A; uint8 x; GetAB(A); x=RdMem(A); op; break; }
360 #define LD_ABI(reg,op) {unsigned int A; uint8 x; GetABIRD(A,reg); x=RdMem(A); op; break;}
361 #define LD_ABX(op) LD_ABI(_X,op)
362 #define LD_ABY(op) LD_ABI(_Y,op)
363 #define LD_IX(op) {unsigned int A; uint8 x; GetIX(A); x=RdMem(A); op; break;}
364 #define LD_IY(op) {unsigned int A; uint8 x; GetIYRD(A); x=RdMem(A); op; break;}
366 #define ST_ZP(r) {uint8 A; GetZP(A); WrRAM(A,r); break;}
367 #define ST_ZPX(r) {uint8 A; GetZPI(A,_X); WrRAM(A,r); break;}
368 #define ST_ZPY(r) {uint8 A; GetZPI(A,_Y); WrRAM(A,r); break;}
369 #define ST_AB(r) {unsigned int A; GetAB(A); WrMem(A,r); break;}
370 #define ST_ABI(reg,r) {unsigned int A; GetABIWR(A,reg); WrMem(A,r); break; }
371 #define ST_ABX(r) ST_ABI(_X,r)
372 #define ST_ABY(r) ST_ABI(_Y,r)
373 #define ST_IX(r) {unsigned int A; GetIX(A); WrMem(A,r); break; }
374 #define ST_IY(r) {unsigned int A; GetIYWR(A); WrMem(A,r); break; }
376 static uint8 CycTable[256] =
378 /*0x00*/ 7,6,2,8,3,3,5,5,3,2,2,2,4,4,6,6,
379 /*0x10*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
380 /*0x20*/ 6,6,2,8,3,3,5,5,4,2,2,2,4,4,6,6,
381 /*0x30*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
382 /*0x40*/ 6,6,2,8,3,3,5,5,3,2,2,2,3,4,6,6,
383 /*0x50*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
384 /*0x60*/ 6,6,2,8,3,3,5,5,4,2,2,2,5,4,6,6,
385 /*0x70*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
386 /*0x80*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
387 /*0x90*/ 2,6,2,6,4,4,4,4,2,5,2,5,5,5,5,5,
388 /*0xA0*/ 2,6,2,6,3,3,3,3,2,2,2,2,4,4,4,4,
389 /*0xB0*/ 2,5,2,5,4,4,4,4,2,4,2,4,4,4,4,4,
390 /*0xC0*/ 2,6,2,8,3,3,5,5,2,2,2,2,4,4,6,6,
391 /*0xD0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
392 /*0xE0*/ 2,6,3,8,3,3,5,5,2,2,2,2,4,4,6,6,
393 /*0xF0*/ 2,5,2,8,4,4,6,6,2,4,2,7,4,4,7,7,
396 void FASTAPASS(1) X6502_IRQBegin_c(int w)
401 void FASTAPASS(1) X6502_IRQEnd_c(int w)
406 void TriggerIRQ_c(void) /* This function should probably be phased out. */
408 _IRQlow|=FCEU_IQTEMP;
411 void TriggerNMINSF_c(void)
416 PUSH((_P&~B_FLAG)|(U_FLAG));
420 void TriggerNMI_c(void)
425 static void TriggerNMIReal(void)
435 _PC|=RdMem(0xFFFB)<<8;
436 #ifdef DEBUG_ASM_6502
443 void TriggerIRQReal(void)
445 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;
466 if(FCEUGameInfo.type==GIT_NSF) _PC=0x3830;
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. */
517 ADDCYC(CycTable[b1]);
535 if((PSG[0x10]&0x80) && !(PSG[0x10]&0x40))
537 extern uint8 SIRQStat;
539 X6502_IRQBegin_c(FCEU_IQDPCM);
544 #ifdef DEBUG_ASM_6502
548 //printf("$%04x:$%02x\n",_PC,b1);
550 //printf("$%02x\n",b1);
557 temp=_tcount; /* Gradius II (J) glitches if _tcount is not used */
561 #ifdef DEBUG_ASM_6502
567 #ifdef DEBUG_ASM_6502