195 lines
5.9 KiB
C
195 lines
5.9 KiB
C
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#define fetch8(x) fetch8func((cycles++,(x)))
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#define NFAKES 16
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typedef struct
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{
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unsigned a;
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unsigned x;
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unsigned y;
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unsigned pc; /* Keep pbr in there too */
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unsigned dbr;
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unsigned d;
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unsigned s;
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unsigned p;
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unsigned e;
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unsigned char *memory;
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unsigned int exception;
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unsigned int ticks;
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unsigned int cycles;
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unsigned int insts;
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unsigned int r[NFAKES];
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}
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saved_state_type;
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#define GET_P \
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((GET_NBIT << 7) \
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| (GET_VBIT << 6) \
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| (GET_MBIT << 5) \
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| (GET_XBIT << 4) \
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| (GET_DBIT << 3) \
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| (GET_IBIT << 2) \
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| (GET_ZBIT << 1) \
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| (GET_CBIT << 0))
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#define SET_P(_bits) \
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{ int bits = _bits; \
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SET_NBIT((bits>>7)&1); \
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SET_VBIT((bits>>6)&1); \
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SET_MBIT((bits>>5)&1); \
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SET_XBIT((bits>>4)&1); \
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SET_DBIT((bits>>3)&1); \
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SET_IBIT((bits>>2)&1); \
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SET_ZBIT((bits>>1)&1); \
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SET_CBIT((bits>>0)&1); }
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#define BFLAG (1<<4)
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#define DFLAG (1<<3)
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#define GET_A (the_a)
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#define GET_E (the_e)
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#define GET_B (the_b)
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#define GET_CBIT (the_cbit)
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#define GET_D (the_d)
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#define GET_DBIT (the_dbit)
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#define GET_DBR_HIGH (the_dbr)
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#define GET_DBR_LOW (the_dbr >> 16)
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#define GET_DPR (the_dpr)
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#define GET_IBIT (the_ibit)
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#define GET_MBIT (the_mbit)
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#define SET_XBIT(x) { the_xbit = x; }
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#define GET_NBIT (the_nbit)
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#define GET_PBRPC (the_pc)
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#define GET_PBR_HIGH (the_pc & 0xff0000)
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#define GET_PBR_LOW (the_pc >> 16)
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#define GET_PC (the_pc & 0xffff)
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#define GET_S (the_s)
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#define GET_VBIT (the_vbit)
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#define GET_X (the_x)
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#define GET_XBIT (the_xbit)
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#define GET_Y (the_y)
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#define GET_ZBIT (the_zbit)
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#define IFLAG (1<<2)
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#define INC_PC(x) {the_pc += x;}
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#define POP16(x) { int _xx; POP8(x); POP8(_xx); x+= _xx<<8;}
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#define POP24(x) { int _xx; POP8(x); POP8(_xx); x += _xx << 8; POP8(_xx); x += _xx << 16; }
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#define POP8(x) { SET_S(GET_S +1); x = fetch8(GET_S);}
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#define PUSH16(x) { int _xx = x;PUSH8(_xx >> 8); PUSH8(_xx);}
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#define PUSH8(x) { store8(GET_S, x); SET_S(GET_S-1);}
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#define SET_A(x) { the_a = x & AMASK; }
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#define SET_B(x) { the_b = x;}
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#define SET_CBIT(x) { the_cbit = x;}
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#define SET_CBIT_M(x) { the_cbit = (x & (GET_MBIT ? 0x100: 0x10000)) != 0;}
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#define SET_CBIT_X(x) { the_cbit = (x & (GET_XBIT ? 0x100: 0x10000)) != 0;}
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#define SET_D(x) {the_d = x;}
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#define SET_DBIT(x) { the_dbit= x;}
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#define SET_DBR_LOW(x) {the_dbr = (x<<16);}
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#define SET_DPR(x) { the_dpr = x;}
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#define SET_E(x) { the_e = x;}
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#define SET_IBIT(x) { the_ibit = x;}
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#define SET_MBIT(x) { the_mbit = x; }
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#define SET_NBIT(x) { the_nbit = x;}
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#define SET_NBIT_16(x) { the_nbit= ( ((x) & (0x8000)) != 0);}
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#define SET_NBIT_8(x) { the_nbit= ( ((x) & (0x80)) != 0);}
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#define SET_NBIT_M(x) { if (GET_MBIT) { SET_NBIT_8(x); } else { SET_NBIT_16(x);}}
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#define SET_NBIT_X(x) { if (GET_XBIT) { SET_NBIT_8(x); } else { SET_NBIT_16(x);}}
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#define SET_PBR(x) { the_pc = (the_pc & 0xffff) + ((x)<<16);}
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#define SET_PBRPC(x) { the_pc = x;}
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#define SET_ONLY_PC(x) { the_pc = (the_pc & 0xff0000) + ((x ) & 0xffff);}
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#define SET_S(x) {the_s = x; }
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#define SET_VBIT_16(x) {the_vbit = ((((int)x) < -0x8000) || (((int)x) > 0x7fff));}
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#define SET_VBIT_8(x) {the_vbit = ((((int)x) < -0x80) || (((int)x) > 0x7f));}
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/*#define SET_VBIT_M(x) { if(GET_MBIT) {SET_VBIT_8(x);}else {SET_VBIT_16(x);}}*/
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#define SET_ZBIT_16(x) { the_zbit = ((x & 0xffff) == 0);}
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#define SET_ZBIT_8(x) { the_zbit = ((x & 0xff) == 0);}
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#define SET_ZBIT_M(x) { if(GET_MBIT) {SET_ZBIT_8(x);}else {SET_ZBIT_16(x);}}
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#define SET_ZBIT_X(x) { if(GET_XBIT) {SET_ZBIT_8(x);}else {SET_ZBIT_16(x);}}
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#define SET_VBIT(x) { the_vbit = x; }
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#define SET_ZBIT(x) { the_zbit = x; }
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#define SET_X(x) { the_x = (x) & (GET_XBIT ? 0xff : 0xffff);}
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#define SET_Y(x) { the_y = (x) & (GET_XBIT ? 0xff : 0xffff);}
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#define AMASK ( GET_MBIT ? 0xff : 0xffff)
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#define SMASK ( GET_MBIT ? 0x80 : 0x8000)
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#define SET_VBIT_M(s1,acc,d) ( the_vbit = ((s1 ^ acc) & (acc ^ d) & SMASK )!=0)
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/*#define fetch8(x) (memory[x&MMASK])*/
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#define fetch16(x) (fetch8(x) + (fetch8((x)+1)<<8))
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#define fetch24(x) (fetch8(x) + (fetch8((x)+1)<<8) + (fetch8((x)+2)<<16))
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#define fetch8sext(x) ((char)fetch8(x))
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#define fetch16sext(x) ((short)fetch16(x))
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#define store8(x,y) {memory[x&MMASK]=y;}
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#define store16(x,y) { store8(x,y); store8(x+1,y>>8);}
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#define SEXTM(x) (GET_MBIT ? ((char)x): ((short)x))
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#define STARTFUNC() \
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register unsigned char *memory;\
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int the_s; \
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int the_b; \
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int the_x; \
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int the_d; \
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int the_y; \
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int the_dbr; \
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int the_pc; \
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int the_nbit; \
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int the_vbit; \
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int the_z; \
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int the_mbit; \
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int the_ibit; \
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int the_xbit; \
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int the_zbit; \
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int the_cbit; \
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int the_dbit; \
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int the_dpr; \
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int the_e; \
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int the_a; \
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int tick_start = get_now ();\
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int cycles = 0; \
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int insts = 0; \
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\
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SET_E (saved_state.e); \
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SET_P (saved_state.p); \
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SET_A (saved_state.a); \
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SET_X (saved_state.x); \
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SET_Y (saved_state.y); \
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SET_ONLY_PC (saved_state.pc); \
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SET_PBR (saved_state.pc >> 16); \
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SET_DBR_LOW (saved_state.dbr); \
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SET_D (saved_state.d); \
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SET_S (saved_state.s); \
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memory = saved_state.memory ; \
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{ int k; for (k = 0; k < NFAKES; k++) \
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store16(0x10 + k * 2, saved_state.r[k]); }\
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\
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top: \
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#define ENDFUNC() \
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rethink: \
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saved_state.ticks += get_now () - tick_start;\
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saved_state.cycles += cycles; \
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saved_state.insts += insts; \
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{ int k; for (k = 0; k < NFAKES; k++) \
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saved_state.r[k] = fetch16(0x10 + k * 2); }\
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\
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saved_state.e = GET_E; \
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saved_state.p = GET_P; \
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saved_state.a = GET_A; \
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saved_state.x = GET_X; \
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saved_state.y = GET_Y; \
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saved_state.pc = GET_PBRPC; \
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saved_state.dbr = GET_DBR_LOW; \
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saved_state.d = GET_D; \
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saved_state.s = GET_S; \
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\
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return 0; \
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extern saved_state_type saved_state;
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#define MMASK 0xfffff
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#define NUMSEGS 16
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#define RETHINK goto rethink;
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