rockbox/apps/plugins/rockboy/cpu.c

#include "rockmacros.h"
#include "defs.h"
#include "regs.h"
#include "hw.h"
#include "cpu-gb.h"
#include "lcdc.h"
#include "mem.h"
#include "fastmem.h"
#include "cpuregs.h"
#include "cpucore.h"

#ifdef USE_ASM
#include "asm.h"
#endif


struct cpu cpu IBSS_ATTR;


#define ZFLAG(n) ( (n) ? 0 : FZ )


#define PUSH(w) ( (SP -= 2), (writew(xSP, (w))) )
#define POP(w) ( ((w) = readw(xSP)), (SP += 2) )

#define FETCH (readb(PC++))


#define INC(r) { ((r)++); \
F = (F & (FL|FC)) | incflag_table[(r)]; }

#define DEC(r) { ((r)--); \
F = (F & (FL|FC)) | decflag_table[(r)]; }

#define INCW(r) ( (r)++ )

#define DECW(r) ( (r)-- )

#define ADD(n) { \
W(acc) = (un32)A + (un32)(n); \
F = (ZFLAG(LB(acc))) \
| (FH & ((A ^ (n) ^ LB(acc)) << 1)) \
| (HB(acc) << 4); \
A = LB(acc); }

#define ADC(n) { \
W(acc) = (un32)A + (un32)(n) + (un32)((F&FC)>>4); \
F = (ZFLAG(LB(acc))) \
| (FH & ((A ^ (n) ^ LB(acc)) << 1)) \
| (HB(acc) << 4); \
A = LB(acc); }

#define ADDW(n) { \
DW(acc) = (un32)HL + (un32)(n); \
F = (F & (FZ)) \
| (FH & ((H ^ ((n)>>8) ^ HB(acc)) << 1)) \
| (acc.b[HI][LO] << 4); \
HL = W(acc); }

#define ADDSP(n) { \
DW(acc) = (un32)SP + (un32)(n8)(n); \
F = (FH & (((SP>>8) ^ ((n)>>8) ^ HB(acc)) << 1)) \
| (acc.b[HI][LO] << 4); \
SP = W(acc); }

#define LDHLSP(n) { \
DW(acc) = (un32)SP + (un32)(n8)(n); \
F = (FH & (((SP>>8) ^ ((n)>>8) ^ HB(acc)) << 1)) \
| (acc.b[HI][LO] << 4); \
HL = W(acc); }

#define CP(n) { \
W(acc) = (un32)A - (un32)(n); \
F = FN \
| (ZFLAG(LB(acc))) \
| (FH & ((A ^ (n) ^ LB(acc)) << 1)) \
| ((un8)(-(n8)HB(acc)) << 4); }

#define SUB(n) { CP((n)); A = LB(acc); }

#define SBC(n) { \
W(acc) = (un32)A - (un32)(n) - (un32)((F&FC)>>4); \
F = FN \
| (ZFLAG((n8)LB(acc))) \
| (FH & ((A ^ (n) ^ LB(acc)) << 1)) \
| ((un8)(-(n8)HB(acc)) << 4); \
A = LB(acc); }

#define AND(n) { A &= (n); \
F = ZFLAG(A) | FH; }

#define XOR(n) { A ^= (n); \
F = ZFLAG(A); }

#define OR(n) { A |= (n); \
F = ZFLAG(A); }

#define RLCA(r) { (r) = ((r)>>7) | ((r)<<1); \
F = (((r)&0x01)<<4); }

#define RRCA(r) { (r) = ((r)<<7) | ((r)>>1); \
F = (((r)&0x80)>>3); }

#define RLA(r) { \
LB(acc) = (((r)&0x80)>>3); \
(r) = ((r)<<1) | ((F&FC)>>4); \
F = LB(acc); }

#define RRA(r) { \
LB(acc) = (((r)&0x01)<<4); \
(r) = ((r)>>1) | ((F&FC)<<3); \
F = LB(acc); }

#define RLC(r) { RLCA(r); F |= ZFLAG(r); }
#define RRC(r) { RRCA(r); F |= ZFLAG(r); }
#define RL(r) { RLA(r); F |= ZFLAG(r); }
#define RR(r) { RRA(r); F |= ZFLAG(r); }

#define SLA(r) { \
LB(acc) = (((r)&0x80)>>3); \
(r) <<= 1; \
F = ZFLAG((r)) | LB(acc); }

#define SRA(r) { \
LB(acc) = (((r)&0x01)<<4); \
(r) = (un8)(((n8)(r))>>1); \
F = ZFLAG((r)) | LB(acc); }

#define SRL(r) { \
LB(acc) = (((r)&0x01)<<4); \
(r) >>= 1; \
F = ZFLAG((r)) | LB(acc); }

#define CPL(r) { \
(r) = ~(r); \
F |= (FH|FN); }

#define SCF { F = (F & (FZ)) | FC; }

#define CCF { F = (F & (FZ|FC)) ^ FC; }

#define DAA { \
A += (LB(acc) = daa_table[((((int)F)&0x70)<<4) | A]); \
F = (F & (FN)) | ZFLAG(A) | daa_carry_table[LB(acc)>>2]; }

#define SWAP(r) { \
(r) = swap_table[(r)]; \
F = ZFLAG((r)); }

#define BIT(n,r) { F = (F & FC) | ZFLAG(((r) & BIT_N(n))) | FH; }
#define RES(n,r) { (r) &= ~BIT_N(n); }
#define SET(n,r) { (r) |= BIT_N(n); }

#define CB_REG_CASES(r, n) \
case 0x00|(n): RLC(r); break; \
case 0x08|(n): RRC(r); break; \
case 0x10|(n): RL(r); break; \
case 0x18|(n): RR(r); break; \
case 0x20|(n): SLA(r); break; \
case 0x28|(n): SRA(r); break; \
case 0x30|(n): SWAP(r); break; \
case 0x38|(n): SRL(r); break; \
case 0x40|(n): BIT(0, r); break; \
case 0x48|(n): BIT(1, r); break; \
case 0x50|(n): BIT(2, r); break; \
case 0x58|(n): BIT(3, r); break; \
case 0x60|(n): BIT(4, r); break; \
case 0x68|(n): BIT(5, r); break; \
case 0x70|(n): BIT(6, r); break; \
case 0x78|(n): BIT(7, r); break; \
case 0x80|(n): RES(0, r); break; \
case 0x88|(n): RES(1, r); break; \
case 0x90|(n): RES(2, r); break; \
case 0x98|(n): RES(3, r); break; \
case 0xA0|(n): RES(4, r); break; \
case 0xA8|(n): RES(5, r); break; \
case 0xB0|(n): RES(6, r); break; \
case 0xB8|(n): RES(7, r); break; \
case 0xC0|(n): SET(0, r); break; \
case 0xC8|(n): SET(1, r); break; \
case 0xD0|(n): SET(2, r); break; \
case 0xD8|(n): SET(3, r); break; \
case 0xE0|(n): SET(4, r); break; \
case 0xE8|(n): SET(5, r); break; \
case 0xF0|(n): SET(6, r); break; \
case 0xF8|(n): SET(7, r); break;


#define ALU_CASES(base, imm, op, label) \
case (imm): b = FETCH; goto label; \
case (base): b = B; goto label; \
case (base)+1: b = C; goto label; \
case (base)+2: b = D; goto label; \
case (base)+3: b = E; goto label; \
case (base)+4: b = H; goto label; \
case (base)+5: b = L; goto label; \
case (base)+6: b = readb(HL); goto label; \
case (base)+7: b = A; \
label: op(b); break;








#define JR ( PC += 1+(n8)readb(PC) )
#define JP ( PC = readw(PC) )

#define CALL ( PUSH(PC+2), JP )

#define NOJR ( clen--, PC++ )
#define NOJP ( clen--, PC+=2 )
#define NOCALL ( clen-=3, PC+=2 )
#define NORET ( clen-=3 )

#define RST(n) { PUSH(PC); PC = (n); }

#define RET ( POP(PC) )

#define EI ( IMA = 1 )
#define DI ( IMA = IME = 0 )



#define PRE_INT ( DI, PUSH(PC) )
#define THROW_INT(n) ( (IF &= ~BIT_N(n)), (PC = 0x40+((n)<<3)) )

#ifdef DYNAREC
un32 reg_backup[16];
struct dynarec_block *address_map[1<<HASH_SIGNIFICANT_LOWER_BITS];
extern void *dynapointer;
int blockcount;
#define MAXBLOCK 6
#endif



void cpu_reset(void)
{
    union reg acc;
#ifdef DYNAREC
    int i;
    dynapointer=0;
#endif
    cpu.speed = 0;
    cpu.halt = 0;
    cpu.div = 0;
    cpu.tim = 0;
    cpu.lcdc = 40;

    IME = 0;
    IMA = 0;
    
    PC = 0x0100;
    SP = 0xFFFE;
    W(acc) = 0x01B0;
    A=HB(acc);
    F=LB(acc);
    W(acc) = 0x0013;
    B=HB(acc);
    C=LB(acc);
    W(acc) = 0x00D8;
    D=HB(acc);
    E=LB(acc);
    HL = 0x014D;

    if (hw.cgb) A = 0x11;
#ifdef DYNAREC
    for(i=0;i<(1<<HASH_SIGNIFICANT_LOWER_BITS);i++)
        address_map[i]=0;
#endif
}

static void div_advance(int cnt) ICODE_ATTR;
static void div_advance(int cnt)
{
    cpu.div += (cnt<<1);
    if (cpu.div >> 8)
    {
        R_DIV += (cpu.div >> 8);
        cpu.div &= 0xff;
    }
}

static void timer_advance(int cnt) ICODE_ATTR;
static void timer_advance(int cnt)
{
    int unit, tima;
    
    if (!(R_TAC & 0x04)) return;

    unit = ((-R_TAC) & 3) << 1;
    cpu.tim += (cnt<<unit);

    if (cpu.tim >> 9)
    {
        tima = R_TIMA + (cpu.tim >> 9);
        cpu.tim &= 0x1ff;
        if (tima >> 8)
        {
            hw_interrupt(IF_TIMER, IF_TIMER);
            hw_interrupt(0, IF_TIMER);
        }
        while (tima >> 8)
            tima = tima - 256 + R_TMA;
        R_TIMA = tima;
    }
}

static void lcdc_advance(int cnt) ICODE_ATTR;
static void lcdc_advance(int cnt)
{
    cpu.lcdc -= cnt;
    if (cpu.lcdc <= 0) lcdc_trans();
}

static void sound_advance(int cnt) ICODE_ATTR;
static void sound_advance(int cnt)
{
    cpu.snd += cnt;
}

void cpu_timers(int cnt)
{
    div_advance(cnt << cpu.speed);
    timer_advance(cnt << cpu.speed);
    lcdc_advance(cnt);
    if(options.sound)
        sound_advance(cnt);
}

static int cpu_idle(int max)
{
    int cnt, unit;

    if (!(cpu.halt && IME)) return 0;
	if (R_IF & R_IE)
	{
		cpu.halt = 0;
		return 0;
	}

    /* Make sure we don't miss lcdc status events! */
    if ((R_IE & (IF_VBLANK | IF_STAT)) && (max > cpu.lcdc))
        max = cpu.lcdc;
    
    /* If timer interrupt cannot happen, this is very simple! */
    if (!((R_IE & IF_TIMER) && (R_TAC & 0x04)))
    {
        cpu_timers(max);
        return max;
    }

    /* Figure out when the next timer interrupt will happen */
    unit = ((-R_TAC) & 3) << 1;
    cnt = (511 - cpu.tim + BIT_N(unit)) >> unit;
    cnt += (255 - R_TIMA) << (9 - unit);

    if (max < cnt)
        cnt = max;
    
    cpu_timers(cnt);
    return cnt;
}

#ifndef ASM_CPU_EMULATE

extern int debug_trace;

int cpu_emulate(int cycles)
{
    int i;
    static byte op IBSS_ATTR;
    static byte cbop IBSS_ATTR;
    int clen;
    static union reg acc IBSS_ATTR;
    static byte b IBSS_ATTR;
    static word w IBSS_ATTR;

    i = cycles;
next:
#ifdef DYNAREC
    if(shut)
        return cycles-i;
#endif
    if ((clen = cpu_idle(i)))
    {
        i -= clen;
        if (i > 0) goto next;
        return cycles-i;
    }

    if (IME && (IF & IE))
    {
        PRE_INT;
        switch ((byte)(IF & IE))
        {
        case 0x01: case 0x03: case 0x05: case 0x07:
        case 0x09: case 0x0B: case 0x0D: case 0x0F:
        case 0x11: case 0x13: case 0x15: case 0x17:
        case 0x19: case 0x1B: case 0x1D: case 0x1F:
            THROW_INT(0); break;
        case 0x02: case 0x06: case 0x0A: case 0x0E:
        case 0x12: case 0x16: case 0x1A: case 0x1E:
            THROW_INT(1); break;
        case 0x04: case 0x0C: case 0x14: case 0x1C:
            THROW_INT(2); break;
        case 0x08: case 0x18:
            THROW_INT(3); break;
        case 0x10:
            THROW_INT(4); break;
        }
    }
    IME = IMA;
    
/*    if (debug_trace) debug_disassemble(PC, 1); */
#ifdef DYNAREC
    if(PC&0x8000) {
#endif
    op = FETCH;
    clen = cycles_table[op];

    switch(op)
    {
    case 0x00: /* NOP */
    case 0x40: /* LD B,B */
    case 0x49: /* LD C,C */
    case 0x52: /* LD D,D */
    case 0x5B: /* LD E,E */
    case 0x64: /* LD H,H */
    case 0x6D: /* LD L,L */
    case 0x7F: /* LD A,A */
        break;
            
    case 0x41: /* LD B,C */
        B = C; break;
    case 0x42: /* LD B,D */
        B = D; break;
    case 0x43: /* LD B,E */
        B = E; break;
    case 0x44: /* LD B,H */
        B = H; break;
    case 0x45: /* LD B,L */
        B = L; break;
    case 0x46: /* LD B,(HL) */
        B = readb(xHL); break;
    case 0x47: /* LD B,A */
        B = A; break;

    case 0x48: /* LD C,B */
        C = B; break;
    case 0x4A: /* LD C,D */
        C = D; break;
    case 0x4B: /* LD C,E */
        C = E; break;
    case 0x4C: /* LD C,H */
        C = H; break;
    case 0x4D: /* LD C,L */
        C = L; break;
    case 0x4E: /* LD C,(HL) */
        C = readb(xHL); break;
    case 0x4F: /* LD C,A */
        C = A; break;

    case 0x50: /* LD D,B */
        D = B; break;
    case 0x51: /* LD D,C */
        D = C; break;
    case 0x53: /* LD D,E */
        D = E; break;
    case 0x54: /* LD D,H */
        D = H; break;
    case 0x55: /* LD D,L */
        D = L; break;
    case 0x56: /* LD D,(HL) */
        D = readb(xHL); break;
    case 0x57: /* LD D,A */
        D = A; break;

    case 0x58: /* LD E,B */
        E = B; break;
    case 0x59: /* LD E,C */
        E = C; break;
    case 0x5A: /* LD E,D */
        E = D; break;
    case 0x5C: /* LD E,H */
        E = H; break;
    case 0x5D: /* LD E,L */
        E = L; break;
    case 0x5E: /* LD E,(HL) */
        E = readb(xHL); break;
    case 0x5F: /* LD E,A */
        E = A; break;

    case 0x60: /* LD H,B */
        H = B; break;
    case 0x61: /* LD H,C */
        H = C; break;
    case 0x62: /* LD H,D */
        H = D; break;
    case 0x63: /* LD H,E */
        H = E; break;
    case 0x65: /* LD H,L */
        H = L; break;
    case 0x66: /* LD H,(HL) */
        H = readb(xHL); break;
    case 0x67: /* LD H,A */
        H = A; break;
            
    case 0x68: /* LD L,B */
        L = B; break;
    case 0x69: /* LD L,C */
        L = C; break;
    case 0x6A: /* LD L,D */
        L = D; break;
    case 0x6B: /* LD L,E */
        L = E; break;
    case 0x6C: /* LD L,H */
        L = H; break;
    case 0x6E: /* LD L,(HL) */
        L = readb(xHL); break;
    case 0x6F: /* LD L,A */
        L = A; break;
            
    case 0x70: /* LD (HL),B */
        b = B; goto __LD_HL;
    case 0x71: /* LD (HL),C */
        b = C; goto __LD_HL;
    case 0x72: /* LD (HL),D */
        b = D; goto __LD_HL;
    case 0x73: /* LD (HL),E */
        b = E; goto __LD_HL;
    case 0x74: /* LD (HL),H */
        b = H; goto __LD_HL;
    case 0x75: /* LD (HL),L */
        b = L; goto __LD_HL;
    case 0x77: /* LD (HL),A */
        b = A;
    __LD_HL:
        writeb(xHL,b);
        break;
            
    case 0x78: /* LD A,B */
        A = B; break;
    case 0x79: /* LD A,C */
        A = C; break;
    case 0x7A: /* LD A,D */
        A = D; break;
    case 0x7B: /* LD A,E */
        A = E; break;
    case 0x7C: /* LD A,H */
        A = H; break;
    case 0x7D: /* LD A,L */
        A = L; break;
    case 0x7E: /* LD A,(HL) */
        A = readb(xHL); break;

    case 0x01: /* LD BC,imm */
#ifdef DYNAREC
        W(acc) = readw(xPC);
        B=HB(acc);
        C=LB(acc);
#else
        BC = readw(xPC);
#endif
        PC += 2;
        break;
    case 0x11: /* LD DE,imm */
#ifdef DYNAREC
        W(acc) = readw(xPC);
        D=HB(acc);
        E=LB(acc);
#else        
        DE = readw(xPC); 
#endif
        PC += 2; 
        break;
    case 0x21: /* LD HL,imm */
        HL = readw(xPC); PC += 2; break;
    case 0x31: /* LD SP,imm */
        SP = readw(xPC); PC += 2; break;

    case 0x02: /* LD (BC),A */
        writeb(xBC, A); break;
    case 0x0A: /* LD A,(BC) */
        A = readb(xBC); break;
    case 0x12: /* LD (DE),A */
        writeb(xDE, A); break;
    case 0x1A: /* LD A,(DE) */
        A = readb(xDE); break;

    case 0x22: /* LDI (HL),A */
        writeb(xHL, A); HL++; break;
    case 0x2A: /* LDI A,(HL) */
        A = readb(xHL); HL++; break;
    case 0x32: /* LDD (HL),A */
        writeb(xHL, A); HL--; break;
    case 0x3A: /* LDD A,(HL) */
        A = readb(xHL); HL--; break;

    case 0x06: /* LD B,imm */
        B = FETCH; break;
    case 0x0E: /* LD C,imm */
        C = FETCH; break;
    case 0x16: /* LD D,imm */
        D = FETCH; break;
    case 0x1E: /* LD E,imm */
        E = FETCH; break;
    case 0x26: /* LD H,imm */
        H = FETCH; break;
    case 0x2E: /* LD L,imm */
        L = FETCH; break;
    case 0x36: /* LD (HL),imm */
        b = FETCH; writeb(xHL, b); break;
    case 0x3E: /* LD A,imm */
        A = FETCH; break;

    case 0x08: /* LD (imm),SP */
        writew(readw(xPC), SP); PC += 2; break;
    case 0xEA: /* LD (imm),A */
        writeb(readw(xPC), A); PC += 2; break;

    case 0xE0: /* LDH (imm),A */
        writehi(FETCH, A); break;
    case 0xE2: /* LDH (C),A */
        writehi(C, A); break;
    case 0xF0: /* LDH A,(imm) */
        A = readhi(FETCH); break;
    case 0xF2: /* LDH A,(C) (undocumented) */
        A = readhi(C); break;
            

    case 0xF8: /* LD HL,SP+imm */
        b = FETCH; LDHLSP(b); break;
    case 0xF9: /* LD SP,HL */
        SP = HL; break;
    case 0xFA: /* LD A,(imm) */
        A = readb(readw(xPC)); PC += 2; break;

        ALU_CASES(0x80, 0xC6, ADD, __ADD)
        ALU_CASES(0x88, 0xCE, ADC, __ADC)
        ALU_CASES(0x90, 0xD6, SUB, __SUB)
        ALU_CASES(0x98, 0xDE, SBC, __SBC)
        ALU_CASES(0xA0, 0xE6, AND, __AND)
        ALU_CASES(0xA8, 0xEE, XOR, __XOR)
        ALU_CASES(0xB0, 0xF6, OR, __OR)
        ALU_CASES(0xB8, 0xFE, CP, __CP)

    case 0x09: /* ADD HL,BC */
        w = BC; goto __ADDW;
    case 0x19: /* ADD HL,DE */
        w = DE; goto __ADDW;
    case 0x39: /* ADD HL,SP */
        w = SP; goto __ADDW;
    case 0x29: /* ADD HL,HL */
        w = HL;
    __ADDW:
        ADDW(w);
        break;

    case 0x04: /* INC B */
        INC(B); break;
    case 0x0C: /* INC C */
        INC(C); break;
    case 0x14: /* INC D */
        INC(D); break;
    case 0x1C: /* INC E */
        INC(E); break;
    case 0x24: /* INC H */
        INC(H); break;
    case 0x2C: /* INC L */
        INC(L); break;
    case 0x34: /* INC (HL) */
        b = readb(xHL);
        INC(b);
        writeb(xHL, b);
        break;
    case 0x3C: /* INC A */
        INC(A); break;
            
    case 0x03: /* INC BC */
#ifdef DYNAREC
        W(acc)=((B<<8)|C)+1;
        B=HB(acc);
        C=LB(acc);
#else
        INCW(BC); 
#endif
        break;
    case 0x13: /* INC DE */
#ifdef DYNAREC
        W(acc)=((D<<8)|E)+1;
        D=HB(acc);
        E=LB(acc);
#else
        INCW(DE); 
#endif
        break;
    case 0x23: /* INC HL */
        INCW(HL); break;
    case 0x33: /* INC SP */
        INCW(SP); break;
            
    case 0x05: /* DEC B */
        DEC(B); break;
    case 0x0D: /* DEC C */
        DEC(C); break;
    case 0x15: /* DEC D */
        DEC(D); break;
    case 0x1D: /* DEC E */
        DEC(E); break;
    case 0x25: /* DEC H */
        DEC(H); break;
    case 0x2D: /* DEC L */
        DEC(L); break;
    case 0x35: /* DEC (HL) */
        b = readb(xHL);
        DEC(b);
        writeb(xHL, b);
        break;
    case 0x3D: /* DEC A */
        DEC(A); break;

    case 0x0B: /* DEC BC */
#ifdef DYNAREC
        W(acc)=((B<<8)|C)-1;
        B=HB(acc);
        C=LB(acc);
#else
        DECW(BC); 
#endif
        break;
    case 0x1B: /* DEC DE */
#ifdef DYNAREC
        W(acc)=((D<<8)|E)-1;
        D=HB(acc);
        E=LB(acc);
#else                
        DECW(DE); 
#endif
        break;
    case 0x2B: /* DEC HL */
        DECW(HL); break;
    case 0x3B: /* DEC SP */
        DECW(SP); break;

    case 0x07: /* RLCA */
        RLCA(A); break;
    case 0x0F: /* RRCA */
        RRCA(A); break;
    case 0x17: /* RLA */
        RLA(A); break;
    case 0x1F: /* RRA */
        RRA(A); break;

    case 0x27: /* DAA */
        DAA; break;
    case 0x2F: /* CPL */
        CPL(A); break;

    case 0x18: /* JR */
    __JR:
        JR; break;
    case 0x20: /* JR NZ */
        if (!(F&FZ)) goto __JR; NOJR; break;
    case 0x28: /* JR Z */
        if (F&FZ) goto __JR; NOJR; break;
    case 0x30: /* JR NC */
        if (!(F&FC)) goto __JR; NOJR; break;
    case 0x38: /* JR C */
        if (F&FC) goto __JR; NOJR; break;

    case 0xC3: /* JP */
    __JP:
        JP; break;
    case 0xC2: /* JP NZ */
        if (!(F&FZ)) goto __JP; NOJP; break;
    case 0xCA: /* JP Z */
        if (F&FZ) goto __JP; NOJP; break;
    case 0xD2: /* JP NC */
        if (!(F&FC)) goto __JP; NOJP; break;
    case 0xDA: /* JP C */
        if (F&FC) goto __JP; NOJP; break;
    case 0xE9: /* JP HL */
        PC = HL; break;

    case 0xC9: /* RET */
    __RET:
        RET; break;
    case 0xC0: /* RET NZ */
        if (!(F&FZ)) goto __RET; NORET; break;
    case 0xC8: /* RET Z */
        if (F&FZ) goto __RET; NORET; break;
    case 0xD0: /* RET NC */
        if (!(F&FC)) goto __RET; NORET; break;
    case 0xD8: /* RET C */
        if (F&FC) goto __RET; NORET; break;
    case 0xD9: /* RETI */
        IME = IMA = 1; goto __RET;

    case 0xCD: /* CALL */
    __CALL:
        CALL; break;
    case 0xC4: /* CALL NZ */
        if (!(F&FZ)) goto __CALL; NOCALL; break;
    case 0xCC: /* CALL Z */
        if (F&FZ) goto __CALL; NOCALL; break;
    case 0xD4: /* CALL NC */
        if (!(F&FC)) goto __CALL; NOCALL; break;
    case 0xDC: /* CALL C */
        if (F&FC) goto __CALL; NOCALL; break;

    case 0xC7: /* RST 0 */
        b = 0x00; goto __RST;
    case 0xCF: /* RST 8 */
        b = 0x08; goto __RST;
    case 0xD7: /* RST 10 */
        b = 0x10; goto __RST;
    case 0xDF: /* RST 18 */
        b = 0x18; goto __RST;
    case 0xE7: /* RST 20 */
        b = 0x20; goto __RST;
    case 0xEF: /* RST 28 */
        b = 0x28; goto __RST;
    case 0xF7: /* RST 30 */
        b = 0x30; goto __RST;
    case 0xFF: /* RST 38 */
        b = 0x38;
    __RST:
        RST(b); break;
            
    case 0xC1: /* POP BC */
#ifdef DYNAREC
        POP(W(acc));
        B=HB(acc);
        C=LB(acc);
#else
        POP(BC); 
#endif
        break;
    case 0xC5: /* PUSH BC */
        PUSH(BC); break;
    case 0xD1: /* POP DE */
#ifdef DYNAREC
        POP(W(acc));
        D=HB(acc);
        E=LB(acc);
#else
        POP(DE); 
#endif
        break;
    case 0xD5: /* PUSH DE */
        PUSH(DE); break;
    case 0xE1: /* POP HL */
        POP(HL); break;
    case 0xE5: /* PUSH HL */
        PUSH(HL); break;
    case 0xF1: /* POP AF */
#ifdef DYNAREC
        POP(W(acc));
        A=HB(acc);
        F=LB(acc);
#else
        POP(AF); 
        break;
#endif
    case 0xF5: /* PUSH AF */
        PUSH(AF); break;

    case 0xE8: /* ADD SP,imm */
        b = FETCH; ADDSP(b); break;

    case 0xF3: /* DI */
        DI; break;
    case 0xFB: /* EI */
        EI; break;

    case 0x37: /* SCF */
        SCF; break;
    case 0x3F: /* CCF */
        CCF; break;

    case 0x10: /* STOP */
        PC++;
        if (R_KEY1 & 1)
        {
            cpu.speed ^= 1;
            R_KEY1 = (R_KEY1 & 0x7E) | (cpu.speed << 7);
            break;
        }
        /* NOTE - we do not implement dmg STOP whatsoever */
        break;
            
    case 0x76: /* HALT */
        cpu.halt = 1;
        break;

    case 0xCB: /* CB prefix */
        cbop = FETCH;
        clen = cb_cycles_table[cbop];
        switch (cbop)
        {
            CB_REG_CASES(B, 0);
            CB_REG_CASES(C, 1);
            CB_REG_CASES(D, 2);
            CB_REG_CASES(E, 3);
            CB_REG_CASES(H, 4);
            CB_REG_CASES(L, 5);
            CB_REG_CASES(A, 7);
        default:
            b = readb(xHL);
            switch(cbop)
            {
                CB_REG_CASES(b, 6);
            }
            if ((cbop & 0xC0) != 0x40) /* exclude BIT */
                writeb(xHL, b);
            break;
        }
        break;
            
    default:
        die(
            "invalid opcode 0x%02X at address 0x%04X, rombank = %d\n",
            op, (PC-1) & 0xffff, mbc.rombank);
        break;
    }
#ifdef DYNAREC
    } 
    else
    {   /* ROM, dynarec. */
        struct dynarec_block *p=0,*b=address_map[PC&HASH_BITMASK];
        char meow[500];
        byte *ptr=mbc.rmap[PC>>12];
        snprintf(meow,499,"PC: 0x%x 0x%x a: 0x%x\n",
                  ptr,PC, b ? b->address.d : 0);
        rb->splash(HZ*2,meow);
        while(b&&b->address.d!=((unsigned int)(ptr)+PC))
        {
            p=b;
            b=b->next;
        }
        if(b)
        { /* call block */
            int fd;
            blockcount++;
            snprintf(meow,499,"/dyna_0x%x_run.rb",PC);
            fd=open(meow,O_WRONLY|O_CREAT|O_TRUNC, 0666);
            if(fd>=0)
            {
                fdprintf(fd,"Block 0x%x Blockcount: %d\n",PC,blockcount);
                fdprintf(fd,"before: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
                cpu.a,cpu.b,cpu.c,cpu.d,cpu.e,cpu.hl,cpu.f,cpu.sp,cpu.pc,
                cpu.ime);
                if(blockcount<MAXBLOCK)
                {
                        asm volatile ("movem.l (%0),%%d1-%%d7/%%a0-%%a1\n\t"
                        "jsr (%1)\n\t"
                        "movem.l %%d1-%%d7/%%a0-%%a1,(%0)\n\t"
                        :
                        : "a" (&cpu.a), "a" (b->block)
                        : "d0", "d1", "d2", "d3", "d4", "d5", "d6", 
                          "d7", "a0","a1", "a2","a3","a4");
                        clen=blockclen;
                        fdprintf(fd,"after: 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
                        cpu.a,cpu.b,cpu.c,cpu.d,cpu.e,cpu.hl,cpu.f,cpu.sp,
                        cpu.pc,cpu.ime);       
                }
                else
                    die("end");
            close(fd);
            }
        }
        else
        { /* Hash miss -> not found -> recompile block and add it */
            struct dynarec_block *newblock;
            newblock=malloc(sizeof(struct dynarec_block));
            memset(newblock,0,sizeof(struct dynarec_block));
            newblock->address.d=(unsigned int)(ptr)+PC;
            dynamic_recompile(newblock);
            if(p)
               p->next=newblock;
            else
              address_map[PC&HASH_BITMASK]=newblock;
        }
    }
#endif
        
                              
                                                
    clen <<= 1;
    div_advance(clen);
    timer_advance(clen);
    clen >>= cpu.speed;
    lcdc_advance(clen);
    if(options.sound)
        sound_advance(clen);

    i -= clen;
    if (i > 0) goto next;
    return cycles-i;
}

#endif /* ASM_CPU_EMULATE */