m6805.c

这个是延伸mame的在wince平台下的游戏模拟器的代码

	areg = 0x00;  /* clear a */
	xreg = 0x00;  /* clear x */
	sreg = 0x7f;  /* SP = 0x7f */
	m6805_Clear_Pending_Interrupts();

	/* default to unoptimized memory access */
	rd_s_handler = rd_slow;
	rd_s_handler_wd = rd_slow_wd;
	wr_s_handler = wr_slow;
	wr_s_handler_wd = wr_slow_wd;

	/* optimize memory access according to flags */
	if( m6805_Flags & M6805_FAST_S )
	{
		rd_s_handler=rd_fast; rd_s_handler_wd=rd_fast_wd;
		wr_s_handler=wr_fast; wr_s_handler_wd=wr_fast_wd;
	}
}


void m6805_Cause_Interrupt(int type)
{
	pending_interrupts |= type;
}


void m6805_Clear_Pending_Interrupts(void)
{
	pending_interrupts &= ~M6805_INT_IRQ;
}


#include "6805ops.c"


/* execute instructions on this CPU until icount expires */
int m6805_execute(int cycles)
{
	byte ireg;
	m6805_ICount = cycles;

	do
	{
		if (pending_interrupts != 0)
			Interrupt();

		ireg=M_RDOP(pcreg++);

		switch( ireg )
		{
			case 0x00: brset(0x01); break;
			case 0x01: brclr(0x01); break;
			case 0x02: brset(0x02); break;
			case 0x03: brclr(0x02); break;
			case 0x04: brset(0x04); break;
			case 0x05: brclr(0x04); break;
			case 0x06: brset(0x08); break;
			case 0x07: brclr(0x08); break;
			case 0x08: brset(0x10); break;
			case 0x09: brclr(0x10); break;
			case 0x0A: brset(0x20); break;
			case 0x0B: brclr(0x20); break;
			case 0x0C: brset(0x40); break;
			case 0x0D: brclr(0x40); break;
			case 0x0E: brset(0x80); break;
			case 0x0F: brclr(0x80); break;
			case 0x10: bset(0x01); break;
			case 0x11: bclr(0x01); break;
			case 0x12: bset(0x02); break;
			case 0x13: bclr(0x02); break;
			case 0x14: bset(0x04); break;
			case 0x15: bclr(0x04); break;
			case 0x16: bset(0x08); break;
			case 0x17: bclr(0x08); break;
			case 0x18: bset(0x10); break;
			case 0x19: bclr(0x10); break;
			case 0x1a: bset(0x20); break;
			case 0x1b: bclr(0x20); break;
			case 0x1c: bset(0x40); break;
			case 0x1d: bclr(0x40); break;
			case 0x1e: bset(0x80); break;
			case 0x1f: bclr(0x80); break;
			case 0x20: bra(); break;
			case 0x21: brn(); break;
			case 0x22: bhi(); break;
			case 0x23: bls(); break;
			case 0x24: bcc(); break;
			case 0x25: bcs(); break;
			case 0x26: bne(); break;
			case 0x27: beq(); break;
			case 0x28: bhcc(); break;
			case 0x29: bhcs(); break;
			case 0x2a: bpl(); break;
			case 0x2b: bmi(); break;
			case 0x2c: bmc(); break;
			case 0x2d: bms(); break;
			case 0x2e: bil(); break;
			case 0x2f: bih(); break;
			case 0x30: neg_di(); break;
			case 0x31: illegal(); break;
			case 0x32: illegal(); break;
			case 0x33: com_di(); break;
			case 0x34: lsr_di(); break;
			case 0x35: illegal(); break;
			case 0x36: ror_di(); break;
			case 0x37: asr_di(); break;
			case 0x38: lsl_di(); break;
			case 0x39: rol_di(); break;
			case 0x3a: dec_di(); break;
			case 0x3b: illegal(); break;
			case 0x3c: inc_di(); break;
			case 0x3d: tst_di(); break;
			case 0x3e: illegal(); break;
			case 0x3f: clr_di(); break;
			case 0x40: nega(); break;
			case 0x41: illegal(); break;
			case 0x42: illegal(); break;
			case 0x43: coma(); break;
			case 0x44: lsra(); break;
			case 0x45: illegal(); break;
			case 0x46: rora(); break;
			case 0x47: asra(); break;
			case 0x48: lsla(); break;
			case 0x49: rola(); break;
			case 0x4a: deca(); break;
			case 0x4b: illegal(); break;
			case 0x4c: inca(); break;
			case 0x4d: tsta(); break;
			case 0x4e: illegal(); break;
			case 0x4f: clra(); break;
			case 0x50: negx(); break;
			case 0x51: illegal(); break;
			case 0x52: illegal(); break;
			case 0x53: comx(); break;
			case 0x54: lsrx(); break;
			case 0x55: illegal(); break;
			case 0x56: rorx(); break;
			case 0x57: asrx(); break;
			case 0x58: aslx(); break;
			case 0x59: rolx(); break;
			case 0x5a: decx(); break;
			case 0x5b: illegal(); break;
			case 0x5c: incx(); break;
			case 0x5d: tstx(); break;
			case 0x5e: illegal(); break;
			case 0x5f: clrx(); break;
			case 0x60: neg_ix1(); break;
			case 0x61: illegal(); break;
			case 0x62: illegal(); break;
			case 0x63: com_ix1(); break;
			case 0x64: lsr_ix1(); break;
			case 0x65: illegal(); break;
			case 0x66: ror_ix1(); break;
			case 0x67: asr_ix1(); break;
			case 0x68: lsl_ix1(); break;
			case 0x69: rol_ix1(); break;
			case 0x6a: dec_ix1(); break;
			case 0x6b: illegal(); break;
			case 0x6c: inc_ix1(); break;
			case 0x6d: tst_ix1(); break;
			case 0x6e: illegal(); break;
			case 0x6f: clr_ix1(); break;
			case 0x70: neg_ix(); break;
			case 0x71: illegal(); break;
			case 0x72: illegal(); break;
			case 0x73: com_ix(); break;
			case 0x74: lsr_ix(); break;
			case 0x75: illegal(); break;
			case 0x76: ror_ix(); break;
			case 0x77: asr_ix(); break;
			case 0x78: lsl_ix(); break;
			case 0x79: rol_ix(); break;
			case 0x7a: dec_ix(); break;
			case 0x7b: illegal(); break;
			case 0x7c: inc_ix(); break;
			case 0x7d: tst_ix(); break;
			case 0x7e: illegal(); break;
			case 0x7f: clr_ix(); break;
			case 0x80: rti(); break;
			case 0x81: rts(); break;
			case 0x82: illegal(); break;
			case 0x83: swi(); break;
			case 0x84: illegal(); break;
			case 0x85: illegal(); break;
			case 0x86: illegal(); break;
			case 0x87: illegal(); break;
			case 0x88: illegal(); break;
			case 0x89: illegal(); break;
			case 0x8a: illegal(); break;
			case 0x8b: illegal(); break;
			case 0x8c: illegal(); break;
			case 0x8d: illegal(); break;
			case 0x8e: illegal(); break;
			case 0x8f: illegal(); break;
			case 0x90: illegal(); break;
			case 0x91: illegal(); break;
			case 0x92: illegal(); break;
			case 0x93: illegal(); break;
			case 0x94: illegal(); break;
			case 0x95: illegal(); break;
			case 0x96: illegal(); break;
			case 0x97: tax(); break;
			case 0x98: CLC; break;
			case 0x99: SEC; break;
			case 0x9a: CLI; break;
			case 0x9b: SEI; break;
			case 0x9c: rsp(); break;
			case 0x9d: nop(); break;
			case 0x9e: illegal(); break;
			case 0x9f: txa(); break;
			case 0xa0: suba_im(); break;
			case 0xa1: cmpa_im(); break;
			case 0xa2: sbca_im(); break;
			case 0xa3: cpx_im(); break;
			case 0xa4: anda_im(); break;
			case 0xa5: bita_im(); break;
			case 0xa6: lda_im(); break;
			case 0xa7: illegal(); break;
			case 0xa8: eora_im(); break;
			case 0xa9: adca_im(); break;
			case 0xaa: ora_im(); break;
			case 0xab: adda_im(); break;
			case 0xac: illegal(); break;
			case 0xad: bsr(); break;
			case 0xae: ldx_im(); break;
			case 0xaf: illegal(); break;
			case 0xb0: suba_di(); break;
			case 0xb1: cmpa_di(); break;
			case 0xb2: sbca_di(); break;
			case 0xb3: cpx_di(); break;
			case 0xb4: anda_di(); break;
			case 0xb5: bita_di(); break;
			case 0xb6: lda_di(); break;
			case 0xb7: sta_di(); break;
			case 0xb8: eora_di(); break;
			case 0xb9: adca_di(); break;
			case 0xba: ora_di(); break;
			case 0xbb: adda_di(); break;
			case 0xbc: jmp_di(); break;
			case 0xbd: jsr_di(); break;
			case 0xbe: ldx_di(); break;
			case 0xbf: stx_di(); break;
			case 0xc0: suba_ex(); break;
			case 0xc1: cmpa_ex(); break;
			case 0xc2: sbca_ex(); break;
			case 0xc3: cpx_ex(); break;
			case 0xc4: anda_ex(); break;
			case 0xc5: bita_ex(); break;
			case 0xc6: lda_ex(); break;
			case 0xc7: sta_ex(); break;
			case 0xc8: eora_ex(); break;
			case 0xc9: adca_ex(); break;
			case 0xca: ora_ex(); break;
			case 0xcb: adda_ex(); break;
			case 0xcc: jmp_ex(); break;
			case 0xcd: jsr_ex(); break;
			case 0xce: ldx_ex(); break;
			case 0xcf: stx_ex(); break;
			case 0xd0: suba_ix2(); break;
			case 0xd1: cmpa_ix2(); break;
			case 0xd2: sbca_ix2(); break;
			case 0xd3: cpx_ix2(); break;
			case 0xd4: anda_ix2(); break;
			case 0xd5: bita_ix2(); break;
			case 0xd6: lda_ix2(); break;
			case 0xd7: sta_ix2(); break;
			case 0xd8: eora_ix2(); break;
			case 0xd9: adca_ix2(); break;
			case 0xda: ora_ix2(); break;
			case 0xdb: adda_ix2(); break;
			case 0xdc: jmp_ix2(); break;
			case 0xdd: jsr_ix2(); break;
			case 0xde: ldx_ix2(); break;
			case 0xdf: stx_ix2(); break;
			case 0xe0: suba_ix1(); break;
			case 0xe1: cmpa_ix1(); break;
			case 0xe2: sbca_ix1(); break;
			case 0xe3: cpx_ix1(); break;
			case 0xe4: anda_ix1(); break;
			case 0xe5: bita_ix1(); break;
			case 0xe6: lda_ix1(); break;
			case 0xe7: sta_ix1(); break;
			case 0xe8: eora_ix1(); break;
			case 0xe9: adca_ix1(); break;
			case 0xea: ora_ix1(); break;
			case 0xeb: adda_ix1(); break;
			case 0xec: jmp_ix1(); break;
			case 0xed: jsr_ix1(); break;
			case 0xee: ldx_ix1(); break;
			case 0xef: stx_ix1(); break;
			case 0xf0: suba_ix(); break;
			case 0xf1: cmpa_ix(); break;
			case 0xf2: sbca_ix(); break;
			case 0xf3: cpx_ix(); break;
			case 0xf4: anda_ix(); break;
			case 0xf5: bita_ix(); break;
			case 0xf6: lda_ix(); break;
			case 0xf7: sta_ix(); break;
			case 0xf8: eora_ix(); break;
			case 0xf9: adca_ix(); break;
			case 0xfa: ora_ix(); break;
			case 0xfb: adda_ix(); break;
			case 0xfc: jmp_ix(); break;
			case 0xfd: jsr_ix(); break;
			case 0xfe: ldx_ix(); break;
			case 0xff: stx_ix(); break;
		}
		m6805_ICount -= cycles1[ireg];
	} while( m6805_ICount>0 );

	return cycles - m6805_ICount;
}