newcpu.c

十七种模拟器源代码 非常有用的作课程设计不可缺少的

}

#if !defined( RAINE_WIN32 ) && !defined(__MINGW32__)
DEF_INLINE void Interrupt68020(int level)
#else
void Interrupt68020(int level)
#endif
{
   MakeSR();
   if(level>=((regs.sr&0xf00)>>8)) Exception(level+24,regs.pc);
}

static int caar, cacr;

void m68k_move2c(int regno, uae_u32 *regp)
{
   switch (regno) {
	 case 0: regs.sfc = *regp & 7; break;
	 case 1: regs.dfc = *regp & 7; break;
	 case 2: cacr = *regp & 0x3; break;	// ignore C and CE
	 case 0x800: regs.usp = *regp; break;
	 case 0x801: regs.vbr = *regp; break;
	 case 0x802: caar = *regp &0xfc; break;
	 case 0x803: regs.msp = *regp; if (regs.m == 1) m68k_areg(regs, 7) = regs.msp; break;
	 case 0x804: regs.isp = *regp; if (regs.m == 0) m68k_areg(regs, 7) = regs.isp; break;
      default:
         op_illg(0x4E7B);
      break;
   }
}

void m68k_movec2(int regno, uae_u32 *regp)
{
	switch (regno) {
	 case 0: *regp = regs.sfc; break;
	 case 1: *regp = regs.dfc; break;
	 case 2: *regp = cacr; break;
	 case 0x800: *regp = regs.usp; break;
	 case 0x801: *regp = regs.vbr; break;
	 case 0x802: *regp = caar; break;
	 case 0x803: *regp = regs.m == 1 ? m68k_areg(regs, 7) : regs.msp; break;
	 case 0x804: *regp = regs.m == 0 ? m68k_areg(regs, 7) : regs.isp; break;
	 default:
	    op_illg (0x4E7A);
	    break;
	}
}

static DEF_INLINE int
div_unsigned(uae_u32 src_hi, uae_u32 src_lo, uae_u32 div, uae_u32 *quot, uae_u32 *rem)
{
	uae_u32 q = 0, cbit = 0;
	int i;

	if (div <= src_hi) {
	    return(1);
	}
	for (i = 0 ; i < 32 ; i++) {
		cbit = src_hi & 0x80000000ul;
		src_hi <<= 1;
		if (src_lo & 0x80000000ul) src_hi++;
		src_lo <<= 1;
		q = q << 1;
		if (cbit || div <= src_hi) {
			q |= 1;
			src_hi -= div;
		}
	}
	*quot = q;
	*rem = src_hi;
	return(0);
}

void m68k_divl(uae_u32 opcode, uae_u32 src, uae_u16 extra, uaecptr oldpc)
{
	(void)(opcode);
#if defined(uae_s64)
    if (src == 0) {
	Exception(5,oldpc);
	return;
    }
    if (extra & 0x800) {
	// signed variant
	uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
	uae_s64 quot, rem;

	if (extra & 0x400) {
	    a &= 0xffffffffu;
	    a |= (uae_s64)m68k_dreg(regs, extra & 7) << 32;
	}
	rem = a % (uae_s64)(uae_s32)src;
	quot = a / (uae_s64)(uae_s32)src;
	if ((quot & UVAL64(0xffffffff80000000)) != 0
	    && (quot & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
	{
	    VFLG = NFLG = 1;
	    CFLG = 0;
	}
	else {
	    if (((uae_s32)rem < 0) != ((uae_s64)a < 0)) rem = -rem;
	    VFLG = CFLG = 0;
	    ZFLG = ((uae_s32)quot) == 0;
	    NFLG = ((uae_s32)quot) < 0;
	    m68k_dreg(regs, extra & 7) = rem;
	    m68k_dreg(regs, (extra >> 12) & 7) = quot;
	}
    } else {
	// unsigned
	uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
	uae_u64 quot, rem;

	if (extra & 0x400) {
	    a &= 0xffffffffu;
	    a |= (uae_u64)m68k_dreg(regs, extra & 7) << 32;
	}
	rem = a % (uae_u64)src;
	quot = a / (uae_u64)src;
	if (quot > 0xffffffffu) {
	    VFLG = NFLG = 1;
	    CFLG = 0;
	}
	else {
	    VFLG = CFLG = 0;
	    ZFLG = ((uae_s32)quot) == 0;
	    NFLG = ((uae_s32)quot) < 0;
	    m68k_dreg(regs, extra & 7) = rem;
	    m68k_dreg(regs, (extra >> 12) & 7) = quot;
	}
    }
#else
    if (src == 0) {
	Exception(5,oldpc);
	return;
    }
    if (extra & 0x800) {
	// signed variant
	uae_s32 lo = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
	uae_s32 hi = lo < 0 ? -1 : 0;
	uae_s32 save_high;
	uae_u32 quot = 0, rem = 0;
	uae_u32 sign;

	if (extra & 0x400) {
	    hi = (uae_s32)m68k_dreg(regs, extra & 7);
	}
	save_high = hi;
	sign = (hi ^ src);
	if (hi < 0) {
		hi = ~hi;
		lo = -lo;
		if (lo == 0) hi++;
	}
	if ((uae_s32)src < 0) src = -src;
	if (div_unsigned(hi, lo, src, &quot, &rem) ||
	    (sign & 0x80000000) ? quot > 0x80000000 : quot > 0x7fffffff) {
	    VFLG = NFLG = 1;
	    CFLG = 0;
	}
	else {
	    if (sign & 0x80000000) quot = -quot;
	    if (((uae_s32)rem < 0) != (save_high < 0)) rem = -rem;
	    VFLG = CFLG = 0;
	    ZFLG = ((uae_s32)quot) == 0;
	    NFLG = ((uae_s32)quot) < 0;
	    m68k_dreg(regs, extra & 7) = rem;
	    m68k_dreg(regs, (extra >> 12) & 7) = quot;
	}
    } else {
	// unsigned
	uae_u32 lo = (uae_u32)m68k_dreg(regs, (extra >> 12) & 7);
	uae_u32 hi = 0;
	uae_u32 quot = 0, rem = 0;

	if (extra & 0x400) {
	    hi = (uae_u32)m68k_dreg(regs, extra & 7);
	}
	if (div_unsigned(hi, lo, src, &quot, &rem)) {
	    VFLG = NFLG = 1;
	    CFLG = 0;
	}
	else {
	    VFLG = CFLG = 0;
	    ZFLG = ((uae_s32)quot) == 0;
	    NFLG = ((uae_s32)quot) < 0;
	    m68k_dreg(regs, extra & 7) = rem;
	    m68k_dreg(regs, (extra >> 12) & 7) = quot;
	}
    }
#endif
}

static DEF_INLINE void
mul_unsigned(uae_u32 src1, uae_u32 src2, uae_u32 *dst_hi, uae_u32 *dst_lo)
{
	uae_u32 r0 = (src1 & 0xffff) * (src2 & 0xffff);
	uae_u32 r1 = ((src1 >> 16) & 0xffff) * (src2 & 0xffff);
	uae_u32 r2 = (src1 & 0xffff) * ((src2 >> 16) & 0xffff);
	uae_u32 r3 = ((src1 >> 16) & 0xffff) * ((src2 >> 16) & 0xffff);
	uae_u32 lo;

	lo = r0 + ((r1 << 16) & 0xffff0000ul);
	if (lo < r0) r3++;
	r0 = lo;
	lo = r0 + ((r2 << 16) & 0xffff0000ul);
	if (lo < r0) r3++;
	r3 += ((r1 >> 16) & 0xffff) + ((r2 >> 16) & 0xffff);
	*dst_lo = lo;
	*dst_hi = r3;
}

void m68k_mull(uae_u32 opcode, uae_u32 src, uae_u16 extra)
{
	(void)(opcode);
#if defined(uae_s64)
    if (extra & 0x800) {
	// signed variant
	uae_s64 a = (uae_s64)(uae_s32)m68k_dreg(regs, (extra >> 12) & 7);

	a *= (uae_s64)(uae_s32)src;
	VFLG = CFLG = 0;
	ZFLG = a == 0;
	NFLG = a < 0;
	if (extra & 0x400)
	    m68k_dreg(regs, extra & 7) = a >> 32;
	else if ((a & UVAL64(0xffffffff80000000)) != 0
		 && (a & UVAL64(0xffffffff80000000)) != UVAL64(0xffffffff80000000))
	{
	    VFLG = 1;
	}
	m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
    } else {
	// unsigned
	uae_u64 a = (uae_u64)(uae_u32)m68k_dreg(regs, (extra >> 12) & 7);

	a *= (uae_u64)src;
	VFLG = CFLG = 0;
	ZFLG = a == 0;
	NFLG = ((uae_s64)a) < 0;
	if (extra & 0x400)
	    m68k_dreg(regs, extra & 7) = a >> 32;
	else if ((a & UVAL64(0xffffffff00000000)) != 0) {
	    VFLG = 1;
	}
	m68k_dreg(regs, (extra >> 12) & 7) = (uae_u32)a;
    }
#else
    if (extra & 0x800) {
	// signed variant
	uae_s32 src1,src2;
	uae_u32 dst_lo,dst_hi;
	uae_u32 sign;

	src1 = (uae_s32)src;
	src2 = (uae_s32)m68k_dreg(regs, (extra >> 12) & 7);
	sign = (src1 ^ src2);
	if (src1 < 0) src1 = -src1;
	if (src2 < 0) src2 = -src2;
	mul_unsigned((uae_u32)src1,(uae_u32)src2,&dst_hi,&dst_lo);
	if (sign & 0x80000000) {
		dst_hi = ~dst_hi;
		dst_lo = -dst_lo;
		if (dst_lo == 0) dst_hi++;
	}
	VFLG = CFLG = 0;
	ZFLG = dst_hi == 0 && dst_lo == 0;
	NFLG = ((uae_s32)dst_hi) < 0;
	if (extra & 0x400)
	    m68k_dreg(regs, extra & 7) = dst_hi;
	else if ((dst_hi != 0 || (dst_lo & 0x80000000) != 0)
		 && ((dst_hi & 0xffffffff) != 0xffffffff
		     || (dst_lo & 0x80000000) != 0x80000000))
	{
	    VFLG = 1;
	}
	m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
    } else {
	// unsigned
	uae_u32 dst_lo,dst_hi;

	mul_unsigned(src,(uae_u32)m68k_dreg(regs, (extra >> 12) & 7),&dst_hi,&dst_lo);

	VFLG = CFLG = 0;
	ZFLG = dst_hi == 0 && dst_lo == 0;
	NFLG = ((uae_s32)dst_hi) < 0;
	if (extra & 0x400)
	    m68k_dreg(regs, extra & 7) = dst_hi;
	else if (dst_hi != 0) {
	    VFLG = 1;
	}
	m68k_dreg(regs, (extra >> 12) & 7) = dst_lo;
    }
#endif
}


void customreset(void)
{
   //Reset68020();
}

void Reset68020(void)
{
    m68k_areg(regs,7)=get_long(0);
    m68k_setpc(get_long(4));
    regs.s=1;
    regs.m=0;
    regs.stopped=0;
    regs.t1=0;
    regs.t0=0;
    ZFLG=CFLG=NFLG=VFLG=0;
    regs.intmask=7;
    regs.vbr=regs.sfc=regs.dfc=0;
    regs.sr=0x2700;
    MakeFromSR();
}

void op_illg(uae_u32 opcode)
{
    // RAINE #$xx

    if((opcode&0xFF00)==0x7F00){
       F3SystemEEPROMAccess(opcode&0xFF);
       m68k_incpc(2);
       return;
    }

    // LINEF #$xxx

    if((opcode&0xF000)==0xF000){
	Exception(0xB,0);
	return;
    }

    // LINEA #$xxx

    if((opcode&0xF000)==0xA000){
	Exception(0xA,0);
	return;
    }

    #ifdef RAINE_DEBUG
       print_debug("[Illegal 68020 Instruction $%08x:%04x]\n",regs.pc,opcode);
    #endif
    Exception(4,0);
}

#if !defined( RAINE_WIN32 ) && !defined(__MINGW32__)
DEF_INLINE void Stop68020(void)
#else
void Stop68020(void)
#endif
{
   cycles=0;

   #ifdef FAST020
   WriteLong(&cyclepos[0],cycles);
   #endif

   #ifdef RAINE_DEBUG
      print_debug("[68020 Stopped by User]\n");
   #endif
}