/**

  * $Id: sh4core.c,v 1.31 2006-09-23 11:38:41 nkeynes Exp $

  * 

  * SH4 emulation core, and parent module for all the SH4 peripheral

  * modules.

  *

  * Copyright (c) 2005 Nathan Keynes.

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  */

 #define MODULE sh4_module

 #include <math.h>

 #include "dream.h"

 #include "sh4/sh4core.h"

 #include "sh4/sh4mmio.h"

 #include "sh4/intc.h"

 #include "mem.h"

 #include "clock.h"

 #include "syscall.h"

 #define SH4_CALLTRACE 1

 #define MAX_INT 0x7FFFFFFF

 #define MIN_INT 0x80000000

 #define MAX_INTF 2147483647.0

 #define MIN_INTF -2147483648.0

 /* CPU-generated exception code/vector pairs */

 #define EXC_POWER_RESET  0x000 /* vector special */

 #define EXC_MANUAL_RESET 0x020

 #define EXC_READ_ADDR_ERR 0x0E0

 #define EXC_WRITE_ADDR_ERR 0x100

 #define EXC_SLOT_ILLEGAL 0x1A0

 #define EXC_ILLEGAL      0x180

 #define EXV_ILLEGAL      0x100

 #define EXC_TRAP         0x160

 #define EXV_TRAP         0x100

 #define EXC_FPDISABLE    0x800

 #define EXV_FPDISABLE    0x100

 /********************** SH4 Module Definition ****************************/

 void sh4_init( void );

 void sh4_reset( void );

 uint32_t sh4_run_slice( uint32_t );

 void sh4_start( void );

 void sh4_stop( void );

 void sh4_save_state( FILE *f );

 int sh4_load_state( FILE *f );

 struct dreamcast_module sh4_module = { "SH4", sh4_init, sh4_reset, 

 				       NULL, sh4_run_slice, sh4_stop,

 				       sh4_save_state, sh4_load_state };

 struct sh4_registers sh4r;

 void sh4_init(void)

 {

     register_io_regions( mmio_list_sh4mmio );

     mmu_init();

     sh4_reset();

 }

 void sh4_reset(void)

 {

     /* zero everything out, for the sake of having a consistent state. */

     memset( &sh4r, 0, sizeof(sh4r) );

     /* Resume running if we were halted */

     sh4r.sh4_state = SH4_STATE_RUNNING;

     sh4r.pc    = 0xA0000000;

     sh4r.new_pc= 0xA0000002;

     sh4r.vbr   = 0x00000000;

     sh4r.fpscr = 0x00040001;

     sh4r.sr    = 0x700000F0;

     /* Mem reset will do this, but if we want to reset _just_ the SH4... */

     MMIO_WRITE( MMU, EXPEVT, EXC_POWER_RESET );

     /* Peripheral modules */

     INTC_reset();

     TMU_reset();

     SCIF_reset();

 }

 static struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];

 static int sh4_breakpoint_count = 0;

 void sh4_set_breakpoint( uint32_t pc, int type )

 {

     sh4_breakpoints[sh4_breakpoint_count].address = pc;

     sh4_breakpoints[sh4_breakpoint_count].type = type;

     sh4_breakpoint_count++;

 }

 gboolean sh4_clear_breakpoint( uint32_t pc, int type )

 {

     int i;

     for( i=0; i<sh4_breakpoint_count; i++ ) {

 	if( sh4_breakpoints[i].address == pc && 

 	    sh4_breakpoints[i].type == type ) {

 	    while( ++i < sh4_breakpoint_count ) {

 		sh4_breakpoints[i-1].address = sh4_breakpoints[i].address;

 		sh4_breakpoints[i-1].type = sh4_breakpoints[i].type;

 	    }

 	    sh4_breakpoint_count--;

 	    return TRUE;

 	}

     }

     return FALSE;

 }

 int sh4_get_breakpoint( uint32_t pc )

 {

     int i;

     for( i=0; i<sh4_breakpoint_count; i++ ) {

 	if( sh4_breakpoints[i].address == pc )

 	    return sh4_breakpoints[i].type;

     }

     return 0;

 }

 uint32_t sh4_run_slice( uint32_t nanosecs ) 

 {

     int target = sh4r.icount + nanosecs / sh4_cpu_period;

     int start = sh4r.icount;

     int i;

     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {

 	if( sh4r.int_pending != 0 )

 	    sh4r.sh4_state = SH4_STATE_RUNNING;;

     }

     for( sh4r.slice_cycle = 0; sh4r.slice_cycle < nanosecs; sh4r.slice_cycle += sh4_cpu_period ) {

 	if( !sh4_execute_instruction() )

 	    break;

 #ifdef ENABLE_DEBUG_MODE

 	for( i=0; i<sh4_breakpoint_count; i++ ) {

 	    if( sh4_breakpoints[i].address == sh4r.pc ) {

 		break;

 	    }

 	}

 	if( i != sh4_breakpoint_count ) {

 	    dreamcast_stop();

 	    if( sh4_breakpoints[i].type == BREAK_ONESHOT )

 		sh4_clear_breakpoint( sh4r.pc, BREAK_ONESHOT );

 	    break;

 	}

 #endif	

     }

     /* If we aborted early, but the cpu is still technically running,

      * we're doing a hard abort - cut the timeslice back to what we

      * actually executed

      */

     if( sh4r.slice_cycle != nanosecs && sh4r.sh4_state == SH4_STATE_RUNNING ) {

 	nanosecs = sh4r.slice_cycle;

     }

     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {

 	TMU_run_slice( nanosecs );

 	SCIF_run_slice( nanosecs );

     }

     sh4r.icount += sh4r.slice_cycle / sh4_cpu_period;

     return nanosecs;

 }

 void sh4_stop(void)

 {

 }

 void sh4_save_state( FILE *f )

 {

     fwrite( &sh4r, sizeof(sh4r), 1, f );

     INTC_save_state( f );

     TMU_save_state( f );

     SCIF_save_state( f );

 }

 int sh4_load_state( FILE * f )

 {

     fread( &sh4r, sizeof(sh4r), 1, f );

     INTC_load_state( f );

     TMU_load_state( f );

     return SCIF_load_state( f );

 }

 /********************** SH4 emulation core  ****************************/

 void sh4_set_pc( int pc )

 {

     sh4r.pc = pc;

     sh4r.new_pc = pc+2;

 }

 #define UNDEF(ir) do{ ERROR( "Raising exception on undefined instruction at %08x, opcode = %04x", sh4r.pc, ir ); dreamcast_stop();  return FALSE; }while(0)

 #define UNIMP(ir) do{ ERROR( "Halted on unimplemented instruction at %08x, opcode = %04x", sh4r.pc, ir ); dreamcast_stop(); return FALSE; }while(0)

 #if(SH4_CALLTRACE == 1)

 #define MAX_CALLSTACK 32

 static struct call_stack {

     sh4addr_t call_addr;

     sh4addr_t target_addr;

     sh4addr_t stack_pointer;

 } call_stack[MAX_CALLSTACK];

 static int call_stack_depth = 0;

 int sh4_call_trace_on = 0;

 static inline trace_call( sh4addr_t source, sh4addr_t dest ) 

 {

     if( call_stack_depth < MAX_CALLSTACK ) {

 	call_stack[call_stack_depth].call_addr = source;

 	call_stack[call_stack_depth].target_addr = dest;

 	call_stack[call_stack_depth].stack_pointer = sh4r.r[15];

     }

     call_stack_depth++;

 }

 static inline trace_return( sh4addr_t source, sh4addr_t dest )

 {

     if( call_stack_depth > 0 ) {

 	call_stack_depth--;

     }

 }

 void fprint_stack_trace( FILE *f )

 {

     int i = call_stack_depth -1;

     if( i >= MAX_CALLSTACK )

 	i = MAX_CALLSTACK - 1;

     for( ; i >= 0; i-- ) {

 	fprintf( f, "%d. Call from %08X => %08X, SP=%08X\n", 

 		 (call_stack_depth - i), call_stack[i].call_addr,

 		 call_stack[i].target_addr, call_stack[i].stack_pointer );

     }

 }

 #define TRACE_CALL( source, dest ) trace_call(source, dest)

 #define TRACE_RETURN( source, dest ) trace_return(source, dest)

 #else

 #define TRACE_CALL( dest, rts ) 

 #define TRACE_RETURN( source, dest )

 #endif

 #define RAISE( x, v ) do{ \

     if( sh4r.vbr == 0 ) { \

         ERROR( "%08X: VBR not initialized while raising exception %03X, halting", sh4r.pc, x ); \

         dreamcast_stop(); return FALSE;	\

     } else { \

         sh4r.spc = sh4r.pc + 2; \

         sh4r.ssr = sh4_read_sr(); \

         sh4r.sgr = sh4r.r[15]; \

         MMIO_WRITE(MMU,EXPEVT,x); \

         sh4r.pc = sh4r.vbr + v; \

         sh4r.new_pc = sh4r.pc + 2; \

         sh4_load_sr( sh4r.ssr |SR_MD|SR_BL|SR_RB ); \

     } \

     return TRUE; } while(0)

 #define MEM_READ_BYTE( addr ) sh4_read_byte(addr)

 #define MEM_READ_WORD( addr ) sh4_read_word(addr)

 #define MEM_READ_LONG( addr ) sh4_read_long(addr)

 #define MEM_WRITE_BYTE( addr, val ) sh4_write_byte(addr, val)

 #define MEM_WRITE_WORD( addr, val ) sh4_write_word(addr, val)

 #define MEM_WRITE_LONG( addr, val ) sh4_write_long(addr, val)

 #define FP_WIDTH (IS_FPU_DOUBLESIZE() ? 8 : 4)

 #define MEM_FP_READ( addr, reg ) sh4_read_float( addr, reg );

 #define MEM_FP_WRITE( addr, reg ) sh4_write_float( addr, reg );

 #define CHECK( x, c, v ) if( !x ) RAISE( c, v )

 #define CHECKPRIV() CHECK( IS_SH4_PRIVMODE(), EXC_ILLEGAL, EXV_ILLEGAL )

 #define CHECKRALIGN16(addr) if( (addr)&0x01 ) RAISE( EXC_READ_ADDR_ERR, EXV_TRAP )

 #define CHECKRALIGN32(addr) if( (addr)&0x03 ) RAISE( EXC_READ_ADDR_ERR, EXV_TRAP )

 #define CHECKWALIGN16(addr) if( (addr)&0x01 ) RAISE( EXC_WRITE_ADDR_ERR, EXV_TRAP )

 #define CHECKWALIGN32(addr) if( (addr)&0x03 ) RAISE( EXC_WRITE_ADDR_ERR, EXV_TRAP )

 #define CHECKFPUEN() CHECK( IS_FPU_ENABLED(), EXC_FPDISABLE, EXV_FPDISABLE )

 #define CHECKDEST(p) if( (p) == 0 ) { ERROR( "%08X: Branch/jump to NULL, CPU halted", sh4r.pc ); dreamcast_stop(); return FALSE; }

 #define CHECKSLOTILLEGAL() if(sh4r.in_delay_slot) { RAISE(EXC_SLOT_ILLEGAL,EXV_ILLEGAL); }

 static void sh4_switch_banks( )

 {

     uint32_t tmp[8];

     memcpy( tmp, sh4r.r, sizeof(uint32_t)*8 );

     memcpy( sh4r.r, sh4r.r_bank, sizeof(uint32_t)*8 );

     memcpy( sh4r.r_bank, tmp, sizeof(uint32_t)*8 );

 }

 static void sh4_load_sr( uint32_t newval )

 {

     if( (newval ^ sh4r.sr) & SR_RB )

         sh4_switch_banks();

     sh4r.sr = newval;

     sh4r.t = (newval&SR_T) ? 1 : 0;

     sh4r.s = (newval&SR_S) ? 1 : 0;

     sh4r.m = (newval&SR_M) ? 1 : 0;

     sh4r.q = (newval&SR_Q) ? 1 : 0;

     intc_mask_changed();

 }

 static void sh4_write_float( uint32_t addr, int reg )

 {

     if( IS_FPU_DOUBLESIZE() ) {

 	if( reg & 1 ) {

 	    sh4_write_long( addr, *((uint32_t *)&XF((reg)&0x0E)) );

 	    sh4_write_long( addr+4, *((uint32_t *)&XF(reg)) );

 	} else {

 	    sh4_write_long( addr, *((uint32_t *)&FR(reg)) ); 

 	    sh4_write_long( addr+4, *((uint32_t *)&FR((reg)|0x01)) );

 	}

     } else {

 	sh4_write_long( addr, *((uint32_t *)&FR((reg))) );

     }

 }

 static void sh4_read_float( uint32_t addr, int reg )

 {

     if( IS_FPU_DOUBLESIZE() ) {

 	if( reg & 1 ) {

 	    *((uint32_t *)&XF((reg) & 0x0E)) = sh4_read_long(addr);

 	    *((uint32_t *)&XF(reg)) = sh4_read_long(addr+4);

 	} else {

 	    *((uint32_t *)&FR(reg)) = sh4_read_long(addr);

 	    *((uint32_t *)&FR((reg) | 0x01)) = sh4_read_long(addr+4);

 	}

     } else {

 	*((uint32_t *)&FR(reg)) = sh4_read_long(addr);

     }

 }

 static uint32_t sh4_read_sr( void )

 {

     /* synchronize sh4r.sr with the various bitflags */

     sh4r.sr &= SR_MQSTMASK;

     if( sh4r.t ) sh4r.sr |= SR_T;

     if( sh4r.s ) sh4r.sr |= SR_S;

     if( sh4r.m ) sh4r.sr |= SR_M;

     if( sh4r.q ) sh4r.sr |= SR_Q;

     return sh4r.sr;

 }

 /* function for external use */

 void sh4_raise_exception( int code, int vector )

 {

     RAISE(code, vector);

 }

 static void sh4_accept_interrupt( void )

 {

     uint32_t code = intc_accept_interrupt();

     sh4r.ssr = sh4_read_sr();

     sh4r.spc = sh4r.pc;

     sh4r.sgr = sh4r.r[15];

     sh4_load_sr( sh4r.ssr|SR_BL|SR_MD|SR_RB );

     MMIO_WRITE( MMU, INTEVT, code );

     sh4r.pc = sh4r.vbr + 0x600;

     sh4r.new_pc = sh4r.pc + 2;

     //    WARN( "Accepting interrupt %03X, from %08X => %08X", code, sh4r.spc, sh4r.pc );

 }

 gboolean sh4_execute_instruction( void )

 {

     uint32_t pc;

     unsigned short ir;

     uint32_t tmp;

     uint64_t tmpl;

     float ftmp;

     double dtmp;

 #define R0 sh4r.r[0]

 #define FR0 FR(0)

 #define DR0 DR(0)

 #define RN(ir) sh4r.r[(ir&0x0F00)>>8]

 #define RN_BANK(ir) sh4r.r_bank[(ir&0x0070)>>4]

 #define RM(ir) sh4r.r[(ir&0x00F0)>>4]

 #define DISP4(ir) (ir&0x000F) /* 4-bit displacements are *NOT* sign-extended */

 #define DISP8(ir) (ir&0x00FF)

 #define PCDISP8(ir) SIGNEXT8(ir&0x00FF)

 #define IMM8(ir) SIGNEXT8(ir&0x00FF)

 #define UIMM8(ir) (ir&0x00FF) /* Unsigned immmediate */

 #define DISP12(ir) SIGNEXT12(ir&0x0FFF)

 #define FRNn(ir) ((ir&0x0F00)>>8)

 #define FRMn(ir) ((ir&0x00F0)>>4)

 #define DRNn(ir) ((ir&0x0E00)>>9)

 #define DRMn(ir) ((ir&0x00E0)>>5)

 #define FVN(ir) ((ir&0x0C00)>>8)

 #define FVM(ir) ((ir&0x0300)>>6)

 #define FRN(ir) FR(FRNn(ir))

 #define FRM(ir) FR(FRMn(ir))

 #define FRNi(ir) (*((uint32_t *)&FR(FRNn(ir))))

 #define FRMi(ir) (*((uint32_t *)&FR(FRMn(ir))))

 #define DRN(ir) DRb(DRNn(ir), ir&0x0100)

 #define DRM(ir) DRb(DRMn(ir),ir&0x0010)

 #define DRNi(ir) (*((uint64_t *)&DR(FRNn(ir))))

 #define DRMi(ir) (*((uint64_t *)&DR(FRMn(ir))))

 #define FPULf   *((float *)&sh4r.fpul)

 #define FPULi    (sh4r.fpul)

     if( SH4_INT_PENDING() ) 

         sh4_accept_interrupt();

     pc = sh4r.pc;

     if( pc > 0xFFFFFF00 ) {

 	/* SYSCALL Magic */

 	syscall_invoke( pc );

 	sh4r.in_delay_slot = 0;

 	pc = sh4r.pc = sh4r.pr;

 	sh4r.new_pc = sh4r.pc + 2;

     }

     CHECKRALIGN16(pc);

     ir = MEM_READ_WORD(pc);

     sh4r.icount++;

     switch( (ir&0xF000)>>12 ) {

         case 0: /* 0000nnnnmmmmxxxx */

             switch( ir&0x000F ) {

                 case 2:

                     switch( (ir&0x00F0)>>4 ) {

                         case 0: /* STC     SR, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4_read_sr();

                             break;

                         case 1: /* STC     GBR, Rn */

                             RN(ir) = sh4r.gbr;

                             break;

                         case 2: /* STC     VBR, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4r.vbr;

                             break;

                         case 3: /* STC     SSR, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4r.ssr;

                             break;

                         case 4: /* STC     SPC, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4r.spc;

                             break;

                         case 8: case 9: case 10: case 11: case 12: case 13:

                         case 14: case 15:/* STC     Rm_bank, Rn */

                             CHECKPRIV();

                             RN(ir) = RN_BANK(ir);

                             break;

                         default: UNDEF(ir);

                     }

                     break;

                 case 3:

                     switch( (ir&0x00F0)>>4 ) {

                         case 0: /* BSRF    Rn */

                             CHECKDEST( pc + 4 + RN(ir) );

                             CHECKSLOTILLEGAL();

                             sh4r.in_delay_slot = 1;

                             sh4r.pr = sh4r.pc + 4;

                             sh4r.pc = sh4r.new_pc;

                             sh4r.new_pc = pc + 4 + RN(ir);

 			    TRACE_CALL( pc, sh4r.new_pc );

                             return TRUE;

                         case 2: /* BRAF    Rn */

                             CHECKDEST( pc + 4 + RN(ir) );

                             CHECKSLOTILLEGAL();

                             sh4r.in_delay_slot = 1;

                             sh4r.pc = sh4r.new_pc;

                             sh4r.new_pc = pc + 4 + RN(ir);

                             return TRUE;

                         case 8: /* PREF    [Rn] */

                             tmp = RN(ir);

                             if( (tmp & 0xFC000000) == 0xE0000000 ) {

                                 /* Store queue operation */

                                 int queue = (tmp&0x20)>>2;

                                 int32_t *src = &sh4r.store_queue[queue];

                                 uint32_t hi = (MMIO_READ( MMU, (queue == 0 ? QACR0 : QACR1) ) & 0x1C) << 24;

                                 uint32_t target = tmp&0x03FFFFE0 | hi;

                                 mem_copy_to_sh4( target, src, 32 );

                             }

                             break;

                         case 9: /* OCBI    [Rn] */

                         case 10:/* OCBP    [Rn] */

                         case 11:/* OCBWB   [Rn] */

                             /* anything? */

                             break;

                         case 12:/* MOVCA.L R0, [Rn] */

 			    tmp = RN(ir);

 			    CHECKWALIGN32(tmp);

 			    MEM_WRITE_LONG( tmp, R0 );

 			    break;

                         default: UNDEF(ir);

                     }

                     break;

                 case 4: /* MOV.B   Rm, [R0 + Rn] */

                     MEM_WRITE_BYTE( R0 + RN(ir), RM(ir) );

                     break;

                 case 5: /* MOV.W   Rm, [R0 + Rn] */

 		    CHECKWALIGN16( R0 + RN(ir) );

                     MEM_WRITE_WORD( R0 + RN(ir), RM(ir) );

                     break;

                 case 6: /* MOV.L   Rm, [R0 + Rn] */

 		    CHECKWALIGN32( R0 + RN(ir) );

                     MEM_WRITE_LONG( R0 + RN(ir), RM(ir) );

                     break;

                 case 7: /* MUL.L   Rm, Rn */

                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |

                         (RM(ir) * RN(ir));

                     break;

                 case 8: 

                     switch( (ir&0x0FF0)>>4 ) {

                         case 0: /* CLRT    */

                             sh4r.t = 0;

                             break;

                         case 1: /* SETT    */

                             sh4r.t = 1;

                             break;

                         case 2: /* CLRMAC  */

                             sh4r.mac = 0;

                             break;

                         case 3: /* LDTLB   */

                             break;

                         case 4: /* CLRS    */

                             sh4r.s = 0;

                             break;

                         case 5: /* SETS    */

                             sh4r.s = 1;

                             break;

                         default: UNDEF(ir);

                     }

                     break;

                 case 9: 

                     if( (ir&0x00F0) == 0x20 ) /* MOVT    Rn */

                         RN(ir) = sh4r.t;

                     else if( ir == 0x0019 ) /* DIV0U   */

                         sh4r.m = sh4r.q = sh4r.t = 0;

                     else if( ir == 0x0009 )

                         /* NOP     */;

                     else UNDEF(ir);

                     break;

                 case 10:

                     switch( (ir&0x00F0) >> 4 ) {

                         case 0: /* STS     MACH, Rn */

                             RN(ir) = sh4r.mac >> 32;

                             break;

                         case 1: /* STS     MACL, Rn */

                             RN(ir) = (uint32_t)sh4r.mac;

                             break;

                         case 2: /* STS     PR, Rn */

                             RN(ir) = sh4r.pr;

                             break;

                         case 3: /* STC     SGR, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4r.sgr;

                             break;

                         case 5:/* STS      FPUL, Rn */

                             RN(ir) = sh4r.fpul;

                             break;

                         case 6: /* STS     FPSCR, Rn */

                             RN(ir) = sh4r.fpscr;

                             break;

                         case 15:/* STC     DBR, Rn */

                             CHECKPRIV();

                             RN(ir) = sh4r.dbr;

                             break;

                         default: UNDEF(ir);

                     }

                     break;

                 case 11:

                     switch( (ir&0x0FF0)>>4 ) {

                         case 0: /* RTS     */

                             CHECKDEST( sh4r.pr );

                             CHECKSLOTILLEGAL();

                             sh4r.in_delay_slot = 1;

                             sh4r.pc = sh4r.new_pc;

                             sh4r.new_pc = sh4r.pr;

                             TRACE_RETURN( pc, sh4r.new_pc );

                             return TRUE;

                         case 1: /* SLEEP   */

 			    if( MMIO_READ( CPG, STBCR ) & 0x80 ) {

 				sh4r.sh4_state = SH4_STATE_STANDBY;

 			    } else {

 				sh4r.sh4_state = SH4_STATE_SLEEP;

 			    }

 			    return FALSE; /* Halt CPU */

                         case 2: /* RTE     */

                             CHECKPRIV();

                             CHECKDEST( sh4r.spc );

                             CHECKSLOTILLEGAL();

                             sh4r.in_delay_slot = 1;

                             sh4r.pc = sh4r.new_pc;

                             sh4r.new_pc = sh4r.spc;

                             sh4_load_sr( sh4r.ssr );

                             return TRUE;

                         default:UNDEF(ir);

                     }

                     break;

                 case 12:/* MOV.B   [R0+R%d], R%d */

                     RN(ir) = MEM_READ_BYTE( R0 + RM(ir) );

                     break;

                 case 13:/* MOV.W   [R0+R%d], R%d */

 		    CHECKRALIGN16( R0 + RM(ir) );

                     RN(ir) = MEM_READ_WORD( R0 + RM(ir) );

                     break;

                 case 14:/* MOV.L   [R0+R%d], R%d */

 		    CHECKRALIGN32( R0 + RM(ir) );

                     RN(ir) = MEM_READ_LONG( R0 + RM(ir) );

                     break;

                 case 15:/* MAC.L   [Rm++], [Rn++] */

 		    CHECKRALIGN32( RM(ir) );

 		    CHECKRALIGN32( RN(ir) );

                     tmpl = ( SIGNEXT32(MEM_READ_LONG(RM(ir))) *

                                   SIGNEXT32(MEM_READ_LONG(RN(ir))) );

                     if( sh4r.s ) {

                         /* 48-bit Saturation. Yuch */

                         tmpl += SIGNEXT48(sh4r.mac);

                         if( tmpl < 0xFFFF800000000000LL )

                             tmpl = 0xFFFF800000000000LL;

                         else if( tmpl > 0x00007FFFFFFFFFFFLL )

                             tmpl = 0x00007FFFFFFFFFFFLL;

                         sh4r.mac = (sh4r.mac&0xFFFF000000000000LL) |

                             (tmpl&0x0000FFFFFFFFFFFFLL);

                     } else sh4r.mac = tmpl;

                     RM(ir) += 4;

                     RN(ir) += 4;

                     break;

                 default: UNDEF(ir);

             }

             break;

         case 1: /* 0001nnnnmmmmdddd */

             /* MOV.L   Rm, [Rn + disp4*4] */

 	    tmp = RN(ir) + (DISP4(ir)<<2);

 	    CHECKWALIGN32( tmp );

             MEM_WRITE_LONG( tmp, RM(ir) );

             break;

         case 2: /* 0010nnnnmmmmxxxx */

             switch( ir&0x000F ) {

                 case 0: /* MOV.B   Rm, [Rn] */

                     MEM_WRITE_BYTE( RN(ir), RM(ir) );

                     break;

                 case 1: /* MOV.W   Rm, [Rn] */

                	    CHECKWALIGN16( RN(ir) );

 		    MEM_WRITE_WORD( RN(ir), RM(ir) );

                     break;

                 case 2: /* MOV.L   Rm, [Rn] */

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), RM(ir) );

                     break;

                 case 3: UNDEF(ir);

                     break;

                 case 4: /* MOV.B   Rm, [--Rn] */

                     RN(ir) --;

                     MEM_WRITE_BYTE( RN(ir), RM(ir) );

                     break;

                 case 5: /* MOV.W   Rm, [--Rn] */

                     RN(ir) -= 2;

 		    CHECKWALIGN16( RN(ir) );

                     MEM_WRITE_WORD( RN(ir), RM(ir) );

                     break;

                 case 6: /* MOV.L   Rm, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), RM(ir) );

                     break;

                 case 7: /* DIV0S   Rm, Rn */

                     sh4r.q = RN(ir)>>31;

                     sh4r.m = RM(ir)>>31;

                     sh4r.t = sh4r.q ^ sh4r.m;

                     break;

                 case 8: /* TST     Rm, Rn */

                     sh4r.t = (RN(ir)&RM(ir) ? 0 : 1);

                     break;

                 case 9: /* AND     Rm, Rn */

                     RN(ir) &= RM(ir);

                     break;

                 case 10:/* XOR     Rm, Rn */

                     RN(ir) ^= RM(ir);

                     break;

                 case 11:/* OR      Rm, Rn */

                     RN(ir) |= RM(ir);

                     break;

                 case 12:/* CMP/STR Rm, Rn */

                     /* set T = 1 if any byte in RM & RN is the same */

                     tmp = RM(ir) ^ RN(ir);

                     sh4r.t = ((tmp&0x000000FF)==0 || (tmp&0x0000FF00)==0 ||

                               (tmp&0x00FF0000)==0 || (tmp&0xFF000000)==0)?1:0;

                     break;

                 case 13:/* XTRCT   Rm, Rn */

                     RN(ir) = (RN(ir)>>16) | (RM(ir)<<16);

                     break;

                 case 14:/* MULU.W  Rm, Rn */

                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |

                         (uint32_t)((RM(ir)&0xFFFF) * (RN(ir)&0xFFFF));

                     break;

                 case 15:/* MULS.W  Rm, Rn */

                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |

                         (uint32_t)(SIGNEXT32(RM(ir)&0xFFFF) * SIGNEXT32(RN(ir)&0xFFFF));

                     break;

             }

             break;

         case 3: /* 0011nnnnmmmmxxxx */

             switch( ir&0x000F ) {

                 case 0: /* CMP/EQ  Rm, Rn */

                     sh4r.t = ( RM(ir) == RN(ir) ? 1 : 0 );

                     break;

                 case 2: /* CMP/HS  Rm, Rn */

                     sh4r.t = ( RN(ir) >= RM(ir) ? 1 : 0 );

                     break;

                 case 3: /* CMP/GE  Rm, Rn */

                     sh4r.t = ( ((int32_t)RN(ir)) >= ((int32_t)RM(ir)) ? 1 : 0 );

                     break;

                 case 4: { /* DIV1    Rm, Rn */

                     /* This is just from the sh4p manual with some

                      * simplifications (someone want to check it's correct? :)

                      * Why they couldn't just provide a real DIV instruction...

                      * Please oh please let the translator batch these things

                      * up into a single DIV... */

                     uint32_t tmp0, tmp1, tmp2, dir;

                     dir = sh4r.q ^ sh4r.m;

                     sh4r.q = (RN(ir) >> 31);

                     tmp2 = RM(ir);

                     RN(ir) = (RN(ir) << 1) | sh4r.t;

                     tmp0 = RN(ir);

                     if( dir ) {

                         RN(ir) += tmp2;

                         tmp1 = (RN(ir)<tmp0 ? 1 : 0 );

                     } else {

                         RN(ir) -= tmp2;

                         tmp1 = (RN(ir)>tmp0 ? 1 : 0 );

                     }

                     sh4r.q ^= sh4r.m ^ tmp1;

                     sh4r.t = ( sh4r.q == sh4r.m ? 1 : 0 );

                     break; }

                 case 5: /* DMULU.L Rm, Rn */

                     sh4r.mac = ((uint64_t)RM(ir)) * ((uint64_t)RN(ir));

                     break;

                 case 6: /* CMP/HI  Rm, Rn */

                     sh4r.t = ( RN(ir) > RM(ir) ? 1 : 0 );

                     break;

                 case 7: /* CMP/GT  Rm, Rn */

                     sh4r.t = ( ((int32_t)RN(ir)) > ((int32_t)RM(ir)) ? 1 : 0 );

                     break;

                 case 8: /* SUB     Rm, Rn */

                     RN(ir) -= RM(ir);

                     break;

                 case 10:/* SUBC    Rm, Rn */

                     tmp = RN(ir);

                     RN(ir) = RN(ir) - RM(ir) - sh4r.t;

                     sh4r.t = (RN(ir) > tmp || (RN(ir) == tmp && sh4r.t == 1));

                     break;

                 case 11:/* SUBV    Rm, Rn */

                     UNIMP(ir);

                     break;

                 case 12:/* ADD     Rm, Rn */

                     RN(ir) += RM(ir);

                     break;

                 case 13:/* DMULS.L Rm, Rn */

                     sh4r.mac = SIGNEXT32(RM(ir)) * SIGNEXT32(RN(ir));

                     break;

                 case 14:/* ADDC    Rm, Rn */

                     tmp = RN(ir);

                     RN(ir) += RM(ir) + sh4r.t;

                     sh4r.t = ( RN(ir) < tmp || (RN(ir) == tmp && sh4r.t != 0) ? 1 : 0 );

                     break;

                 case 15:/* ADDV    Rm, Rn */

 		    tmp = RN(ir) + RM(ir);

 		    sh4r.t = ( (RN(ir)>>31) == (RM(ir)>>31) && ((RN(ir)>>31) != (tmp>>31)) );

 		    RN(ir) = tmp;

                     break;

                 default: UNDEF(ir);

             }

             break;

         case 4: /* 0100nnnnxxxxxxxx */

             switch( ir&0x00FF ) {

                 case 0x00: /* SHLL    Rn */

                     sh4r.t = RN(ir) >> 31;

                     RN(ir) <<= 1;

                     break;

                 case 0x01: /* SHLR    Rn */

                     sh4r.t = RN(ir) & 0x00000001;

                     RN(ir) >>= 1;

                     break;

                 case 0x02: /* STS.L   MACH, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), (sh4r.mac>>32) );

                     break;

                 case 0x03: /* STC.L   SR, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4_read_sr() );

                     break;

                 case 0x04: /* ROTL    Rn */

                     sh4r.t = RN(ir) >> 31;

                     RN(ir) <<= 1;

                     RN(ir) |= sh4r.t;

                     break;

                 case 0x05: /* ROTR    Rn */

                     sh4r.t = RN(ir) & 0x00000001;

                     RN(ir) >>= 1;

                     RN(ir) |= (sh4r.t << 31);

                     break;

                 case 0x06: /* LDS.L   [Rn++], MACH */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.mac = (sh4r.mac & 0x00000000FFFFFFFF) |

                         (((uint64_t)MEM_READ_LONG(RN(ir)))<<32);

                     RN(ir) += 4;

                     break;

                 case 0x07: /* LDC.L   [Rn++], SR */

                     CHECKPRIV();

 		    CHECKWALIGN32( RN(ir) );

                     sh4_load_sr( MEM_READ_LONG(RN(ir)) );

                     RN(ir) +=4;

                     break;

                 case 0x08: /* SHLL2   Rn */

                     RN(ir) <<= 2;

                     break;

                 case 0x09: /* SHLR2   Rn */

                     RN(ir) >>= 2;

                     break;

                 case 0x0A: /* LDS     Rn, MACH */

                     sh4r.mac = (sh4r.mac & 0x00000000FFFFFFFF) |

                         (((uint64_t)RN(ir))<<32);

                     break;

                 case 0x0B: /* JSR     [Rn] */

                     CHECKDEST( RN(ir) );

                     CHECKSLOTILLEGAL();

                     sh4r.in_delay_slot = 1;

                     sh4r.pc = sh4r.new_pc;

                     sh4r.new_pc = RN(ir);

                     sh4r.pr = pc + 4;

 		    TRACE_CALL( pc, sh4r.new_pc );

                     return TRUE;

                 case 0x0E: /* LDC     Rn, SR */

                     CHECKPRIV();

                     sh4_load_sr( RN(ir) );

                     break;

                 case 0x10: /* DT      Rn */

                     RN(ir) --;

                     sh4r.t = ( RN(ir) == 0 ? 1 : 0 );

                     break;

                 case 0x11: /* CMP/PZ  Rn */

                     sh4r.t = ( ((int32_t)RN(ir)) >= 0 ? 1 : 0 );

                     break;

                 case 0x12: /* STS.L   MACL, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), (uint32_t)sh4r.mac );

                     break;

                 case 0x13: /* STC.L   GBR, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.gbr );

                     break;

                 case 0x15: /* CMP/PL  Rn */

                     sh4r.t = ( ((int32_t)RN(ir)) > 0 ? 1 : 0 );

                     break;

                 case 0x16: /* LDS.L   [Rn++], MACL */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.mac = (sh4r.mac & 0xFFFFFFFF00000000LL) |

                         (uint64_t)((uint32_t)MEM_READ_LONG(RN(ir)));

                     RN(ir) += 4;

                     break;

                 case 0x17: /* LDC.L   [Rn++], GBR */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.gbr = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x18: /* SHLL8   Rn */

                     RN(ir) <<= 8;

                     break;

                 case 0x19: /* SHLR8   Rn */

                     RN(ir) >>= 8;

                     break;

                 case 0x1A: /* LDS     Rn, MACL */

                     sh4r.mac = (sh4r.mac & 0xFFFFFFFF00000000LL) |

                         (uint64_t)((uint32_t)(RN(ir)));

                     break;

                 case 0x1B: /* TAS.B   [Rn] */

                     tmp = MEM_READ_BYTE( RN(ir) );

                     sh4r.t = ( tmp == 0 ? 1 : 0 );

                     MEM_WRITE_BYTE( RN(ir), tmp | 0x80 );

                     break;

                 case 0x1E: /* LDC     Rn, GBR */

                     sh4r.gbr = RN(ir);

                     break;

                 case 0x20: /* SHAL    Rn */

                     sh4r.t = RN(ir) >> 31;

                     RN(ir) <<= 1;

                     break;

                 case 0x21: /* SHAR    Rn */

                     sh4r.t = RN(ir) & 0x00000001;

                     RN(ir) = ((int32_t)RN(ir)) >> 1;

                     break;

                 case 0x22: /* STS.L   PR, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.pr );

                     break;

                 case 0x23: /* STC.L   VBR, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.vbr );

                     break;

                 case 0x24: /* ROTCL   Rn */

                     tmp = RN(ir) >> 31;

                     RN(ir) <<= 1;

                     RN(ir) |= sh4r.t;

                     sh4r.t = tmp;

                     break;

                 case 0x25: /* ROTCR   Rn */

                     tmp = RN(ir) & 0x00000001;

                     RN(ir) >>= 1;

                     RN(ir) |= (sh4r.t << 31 );

                     sh4r.t = tmp;

                     break;

                 case 0x26: /* LDS.L   [Rn++], PR */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.pr = MEM_READ_LONG( RN(ir) );

                     RN(ir) += 4;

                     break;

                 case 0x27: /* LDC.L   [Rn++], VBR */

                     CHECKPRIV();

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.vbr = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x28: /* SHLL16  Rn */

                     RN(ir) <<= 16;

                     break;

                 case 0x29: /* SHLR16  Rn */

                     RN(ir) >>= 16;

                     break;

                 case 0x2A: /* LDS     Rn, PR */

                     sh4r.pr = RN(ir);

                     break;

                 case 0x2B: /* JMP     [Rn] */

                     CHECKDEST( RN(ir) );

                     CHECKSLOTILLEGAL();

                     sh4r.in_delay_slot = 1;

                     sh4r.pc = sh4r.new_pc;

                     sh4r.new_pc = RN(ir);

                     return TRUE;

                 case 0x2E: /* LDC     Rn, VBR */

                     CHECKPRIV();

                     sh4r.vbr = RN(ir);

                     break;

                 case 0x32: /* STC.L   SGR, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.sgr );

                     break;

                 case 0x33: /* STC.L   SSR, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.ssr );

                     break;

                 case 0x37: /* LDC.L   [Rn++], SSR */

                     CHECKPRIV();

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.ssr = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x3E: /* LDC     Rn, SSR */

                     CHECKPRIV();

                     sh4r.ssr = RN(ir);

                     break;

                 case 0x43: /* STC.L   SPC, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.spc );

                     break;

                 case 0x47: /* LDC.L   [Rn++], SPC */

                     CHECKPRIV();

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.spc = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x4E: /* LDC     Rn, SPC */

                     CHECKPRIV();

                     sh4r.spc = RN(ir);

                     break;

                 case 0x52: /* STS.L   FPUL, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.fpul );

                     break;

                 case 0x56: /* LDS.L   [Rn++], FPUL */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.fpul = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x5A: /* LDS     Rn, FPUL */

                     sh4r.fpul = RN(ir);

                     break;

                 case 0x62: /* STS.L   FPSCR, [--Rn] */

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.fpscr );

                     break;

                 case 0x66: /* LDS.L   [Rn++], FPSCR */

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.fpscr = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0x6A: /* LDS     Rn, FPSCR */

                     sh4r.fpscr = RN(ir);

                     break;

                 case 0xF2: /* STC.L   DBR, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), sh4r.dbr );

                     break;

                 case 0xF6: /* LDC.L   [Rn++], DBR */

                     CHECKPRIV();

 		    CHECKRALIGN32( RN(ir) );

                     sh4r.dbr = MEM_READ_LONG(RN(ir));

                     RN(ir) +=4;

                     break;

                 case 0xFA: /* LDC     Rn, DBR */

                     CHECKPRIV();

                     sh4r.dbr = RN(ir);

                     break;

                 case 0x83: case 0x93: case 0xA3: case 0xB3: case 0xC3:

                 case 0xD3: case 0xE3: case 0xF3: /* STC.L   Rn_BANK, [--Rn] */

                     CHECKPRIV();

                     RN(ir) -= 4;

 		    CHECKWALIGN32( RN(ir) );

                     MEM_WRITE_LONG( RN(ir), RN_BANK(ir) );

                     break;

                 case 0x87: case 0x97: case 0xA7: case 0xB7: case 0xC7:

                 case 0xD7: case 0xE7: case 0xF7: /* LDC.L   [Rn++], Rn_BANK */

                     CHECKPRIV();

 		    CHECKRALIGN32( RN(ir) );

                     RN_BANK(ir) = MEM_READ_LONG( RN(ir) );

                     RN(ir) += 4;

                     break;

                 case 0x8E: case 0x9E: case 0xAE: case 0xBE: case 0xCE:

                 case 0xDE: case 0xEE: case 0xFE: /* LDC     Rm, Rn_BANK */

                     CHECKPRIV();

                     RN_BANK(ir) = RM(ir);

                     break;

                 default:

                     if( (ir&0x000F) == 0x0F ) {

                         /* MAC.W   [Rm++], [Rn++] */

 			CHECKRALIGN16( RN(ir) );

 			CHECKRALIGN16( RM(ir) );

                         tmp = SIGNEXT16(MEM_READ_WORD(RM(ir))) *

                             SIGNEXT16(MEM_READ_WORD(RN(ir)));

                         if( sh4r.s ) {

                             /* FIXME */

                             UNIMP(ir);

                         } else sh4r.mac += SIGNEXT32(tmp);

                         RM(ir) += 2;

                         RN(ir) += 2;

                     } else if( (ir&0x000F) == 0x0C ) {

                         /* SHAD    Rm, Rn */

                         tmp = RM(ir);

                         if( (tmp & 0x80000000) == 0 ) RN(ir) <<= (tmp&0x1f);

                         else if( (tmp & 0x1F) == 0 )  

 			  RN(ir) = ((int32_t)RN(ir)) >> 31;

                         else 

 			  RN(ir) = ((int32_t)RN(ir)) >> (((~RM(ir)) & 0x1F)+1);

                     } else if( (ir&0x000F) == 0x0D ) {

                         /* SHLD    Rm, Rn */

                         tmp = RM(ir);

                         if( (tmp & 0x80000000) == 0 ) RN(ir) <<= (tmp&0x1f);

                         else if( (tmp & 0x1F) == 0 ) RN(ir) = 0;

                         else RN(ir) >>= (((~tmp) & 0x1F)+1);

                     } else UNDEF(ir);

             }

             break;

         case 5: /* 0101nnnnmmmmdddd */

             /* MOV.L   [Rm + disp4*4], Rn */

 	    tmp = RM(ir) + (DISP4(ir)<<2);

 	    CHECKRALIGN32( tmp );

             RN(ir) = MEM_READ_LONG( tmp );

             break;

         case 6: /* 0110xxxxxxxxxxxx */

             switch( ir&0x000f ) {

                 case 0: /* MOV.B   [Rm], Rn */

                     RN(ir) = MEM_READ_BYTE( RM(ir) );

                     break;

                 case 1: /* MOV.W   [Rm], Rn */

 		    CHECKRALIGN16( RM(ir) );

                     RN(ir) = MEM_READ_WORD( RM(ir) );

                     break;

                 case 2: /* MOV.L   [Rm], Rn */

 		    CHECKRALIGN32( RM(ir) );

                     RN(ir) = MEM_READ_LONG( RM(ir) );

                     break;

                 case 3: /* MOV     Rm, Rn */

                     RN(ir) = RM(ir);

                     break;

                 case 4: /* MOV.B   [Rm++], Rn */

                     RN(ir) = MEM_READ_BYTE( RM(ir) );

                     RM(ir) ++;

                     break;

                 case 5: /* MOV.W   [Rm++], Rn */

 		    CHECKRALIGN16( RM(ir) );

                     RN(ir) = MEM_READ_WORD( RM(ir) );

                     RM(ir) += 2;

                     break;

                 case 6: /* MOV.L   [Rm++], Rn */

 		    CHECKRALIGN32( RM(ir) );

                     RN(ir) = MEM_READ_LONG( RM(ir) );

                     RM(ir) += 4;

                     break;

                 case 7: /* NOT     Rm, Rn */

                     RN(ir) = ~RM(ir);

                     break;

                 case 8: /* SWAP.B  Rm, Rn */

                     RN(ir) = (RM(ir)&0xFFFF0000) | ((RM(ir)&0x0000FF00)>>8) |

                         ((RM(ir)&0x000000FF)<<8);

                     break;

                 case 9: /* SWAP.W  Rm, Rn */

                     RN(ir) = (RM(ir)>>16) | (RM(ir)<<16);

                     break;

                 case 10:/* NEGC    Rm, Rn */

                     tmp = 0 - RM(ir);

                     RN(ir) = tmp - sh4r.t;

                     sh4r.t = ( 0<tmp || tmp<RN(ir) ? 1 : 0 );

                     break;

                 case 11:/* NEG     Rm, Rn */

                     RN(ir) = 0 - RM(ir);

                     break;

                 case 12:/* EXTU.B  Rm, Rn */

                     RN(ir) = RM(ir)&0x000000FF;

                     break;

                 case 13:/* EXTU.W  Rm, Rn */

                     RN(ir) = RM(ir)&0x0000FFFF;

                     break;

                 case 14:/* EXTS.B  Rm, Rn */

                     RN(ir) = SIGNEXT8( RM(ir)&0x000000FF );

                     break;

                 case 15:/* EXTS.W  Rm, Rn */

                     RN(ir) = SIGNEXT16( RM(ir)&0x0000FFFF );

                     break;

             }

             break;

         case 7: /* 0111nnnniiiiiiii */

             /* ADD    imm8, Rn */

             RN(ir) += IMM8(ir);

             break;

         case 8: /* 1000xxxxxxxxxxxx */

             switch( (ir&0x0F00) >> 8 ) {

                 case 0: /* MOV.B   R0, [Rm + disp4] */

                     MEM_WRITE_BYTE( RM(ir) + DISP4(ir), R0 );

                     break;

                 case 1: /* MOV.W   R0, [Rm + disp4*2] */

 		    tmp = RM(ir) + (DISP4(ir)<<1);

 		    CHECKWALIGN16( tmp );

                     MEM_WRITE_WORD( tmp, R0 );

                     break;

                 case 4: /* MOV.B   [Rm + disp4], R0 */

                     R0 = MEM_READ_BYTE( RM(ir) + DISP4(ir) );

                     break;

                 case 5: /* MOV.W   [Rm + disp4*2], R0 */

 		    tmp = RM(ir) + (DISP4(ir)<<1);

 		    CHECKRALIGN16( tmp );

                     R0 = MEM_READ_WORD( tmp );

                     break;

                 case 8: /* CMP/EQ  imm, R0 */

                     sh4r.t = ( R0 == IMM8(ir) ? 1 : 0 );

                     break;

                 case 9: /* BT      disp8 */

                     CHECKSLOTILLEGAL()

                     if( sh4r.t ) {

                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )

                         sh4r.pc += (PCDISP8(ir)<<1) + 4;

                         sh4r.new_pc = sh4r.pc + 2;

                         return TRUE;

                     }

                     break;

                 case 11:/* BF      disp8 */

                     CHECKSLOTILLEGAL()

                     if( !sh4r.t ) {

                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )

                         sh4r.pc += (PCDISP8(ir)<<1) + 4;

                         sh4r.new_pc = sh4r.pc + 2;

                         return TRUE;

                     }

                     break;

                 case 13:/* BT/S    disp8 */

                     CHECKSLOTILLEGAL()

                     if( sh4r.t ) {

                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )

                         sh4r.in_delay_slot = 1;

                         sh4r.pc = sh4r.new_pc;

                         sh4r.new_pc = pc + (PCDISP8(ir)<<1) + 4;

                         sh4r.in_delay_slot = 1;

                         return TRUE;

                     }

                     break;

                 case 15:/* BF/S    disp8 */

                     CHECKSLOTILLEGAL()

                     if( !sh4r.t ) {

                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )

                         sh4r.in_delay_slot = 1;

                         sh4r.pc = sh4r.new_pc;

                         sh4r.new_pc = pc + (PCDISP8(ir)<<1) + 4;

                         return TRUE;

                     }

                     break;

                 default: UNDEF(ir);

             }

             break;

         case 9: /* 1001xxxxxxxxxxxx */

             /* MOV.W   [disp8*2 + pc + 4], Rn */

 	    tmp = pc + 4 + (DISP8(ir)<<1);

 	    CHECKRALIGN16( tmp );

             RN(ir) = MEM_READ_WORD( tmp );

             break;

         case 10:/* 1010dddddddddddd */

             /* BRA     disp12 */

             CHECKDEST( sh4r.pc + (DISP12(ir)<<1) + 4 )

             CHECKSLOTILLEGAL()

             sh4r.in_delay_slot = 1;

             sh4r.pc = sh4r.new_pc;

             sh4r.new_pc = pc + 4 + (DISP12(ir)<<1);

             return TRUE;

         case 11:/* 1011dddddddddddd */

             /* BSR     disp12 */

             CHECKDEST( sh4r.pc + (DISP12(ir)<<1) + 4 )

             CHECKSLOTILLEGAL()

             sh4r.in_delay_slot = 1;

             sh4r.pr = pc + 4;

             sh4r.pc = sh4r.new_pc;

             sh4r.new_pc = pc + 4 + (DISP12(ir)<<1);

 	    TRACE_CALL( pc, sh4r.new_pc );

             return TRUE;

         case 12:/* 1100xxxxdddddddd */

         switch( (ir&0x0F00)>>8 ) {

                 case 0: /* MOV.B  R0, [GBR + disp8] */

                     MEM_WRITE_BYTE( sh4r.gbr + DISP8(ir), R0 );

                     break;

                 case 1: /* MOV.W  R0, [GBR + disp8*2] */

 		    tmp = sh4r.gbr + (DISP8(ir)<<1);

 		    CHECKWALIGN16( tmp );

                     MEM_WRITE_WORD( tmp, R0 );

                     break;

                 case  2: /*MOV.L   R0, [GBR + disp8*4] */

 		    tmp = sh4r.gbr + (DISP8(ir)<<2);

 		    CHECKWALIGN32( tmp );

                     MEM_WRITE_LONG( tmp, R0 );

                     break;

                 case 3: /* TRAPA   imm8 */

                     CHECKSLOTILLEGAL()

                     sh4r.in_delay_slot = 1;

                     MMIO_WRITE( MMU, TRA, UIMM8(ir)<<2 );

                     RAISE( EXC_TRAP, EXV_TRAP );

                     break;

                 case 4: /* MOV.B   [GBR + disp8], R0 */

                     R0 = MEM_READ_BYTE( sh4r.gbr + DISP8(ir) );

                     break;

                 case 5: /* MOV.W   [GBR + disp8*2], R0 */

 		    tmp = sh4r.gbr + (DISP8(ir)<<1);

 		    CHECKRALIGN16( tmp );

                     R0 = MEM_READ_WORD( tmp );

                     break;

                 case 6: /* MOV.L   [GBR + disp8*4], R0 */

 		    tmp = sh4r.gbr + (DISP8(ir)<<2);

 		    CHECKRALIGN32( tmp );

                     R0 = MEM_READ_LONG( tmp );

                     break;

                 case 7: /* MOVA    disp8 + pc&~3 + 4, R0 */

                     R0 = (pc&0xFFFFFFFC) + (DISP8(ir)<<2) + 4;

                     break;

                 case 8: /* TST     imm8, R0 */

                     sh4r.t = (R0 & UIMM8(ir) ? 0 : 1);

                     break;

                 case 9: /* AND     imm8, R0 */

                     R0 &= UIMM8(ir);

                     break;

                 case 10:/* XOR     imm8, R0 */

                     R0 ^= UIMM8(ir);

                     break;

                 case 11:/* OR      imm8, R0 */

                     R0 |= UIMM8(ir);

                     break;

                 case 12:/* TST.B   imm8, [R0+GBR] */		    

                     sh4r.t = ( MEM_READ_BYTE(R0 + sh4r.gbr) & UIMM8(ir) ? 0 : 1 );

                     break;

                 case 13:/* AND.B   imm8, [R0+GBR] */

                     MEM_WRITE_BYTE( R0 + sh4r.gbr,

                                     UIMM8(ir) & MEM_READ_BYTE(R0 + sh4r.gbr) );

                     break;

                 case 14:/* XOR.B   imm8, [R0+GBR] */

                     MEM_WRITE_BYTE( R0 + sh4r.gbr,

                                     UIMM8(ir) ^ MEM_READ_BYTE(R0 + sh4r.gbr) );

                     break;

                 case 15:/* OR.B    imm8, [R0+GBR] */

                     MEM_WRITE_BYTE( R0 + sh4r.gbr,

                                     UIMM8(ir) | MEM_READ_BYTE(R0 + sh4r.gbr) );

                     break;

             }

             break;

         case 13:/* 1101nnnndddddddd */

             /* MOV.L   [disp8*4 + pc&~3 + 4], Rn */

 	    tmp = (pc&0xFFFFFFFC) + (DISP8(ir)<<2) + 4;

 	    CHECKRALIGN32( tmp );

             RN(ir) = MEM_READ_LONG( tmp );

             break;

         case 14:/* 1110nnnniiiiiiii */

             /* MOV     imm8, Rn */

             RN(ir) = IMM8(ir);

             break;

         case 15:/* 1111xxxxxxxxxxxx */

             CHECKFPUEN();

 	    if( IS_FPU_DOUBLEPREC() ) {

 		switch( ir&0x000F ) {

                 case 0: /* FADD    FRm, FRn */

                     DRN(ir) += DRM(ir);

                     break;

                 case 1: /* FSUB    FRm, FRn */

                     DRN(ir) -= DRM(ir);

                     break;

                 case 2: /* FMUL    FRm, FRn */

                     DRN(ir) = DRN(ir) * DRM(ir);

                     break;

                 case 3: /* FDIV    FRm, FRn */

                     DRN(ir) = DRN(ir) / DRM(ir);

                     break;

                 case 4: /* FCMP/EQ FRm, FRn */

                     sh4r.t = ( DRN(ir) == DRM(ir) ? 1 : 0 );

                     break;

                 case 5: /* FCMP/GT FRm, FRn */

                     sh4r.t = ( DRN(ir) > DRM(ir) ? 1 : 0 );

                     break;

                 case 6: /* FMOV.S  [Rm+R0], FRn */

                     MEM_FP_READ( RM(ir) + R0, FRNn(ir) );

                     break;

                 case 7: /* FMOV.S  FRm, [Rn+R0] */

                     MEM_FP_WRITE( RN(ir) + R0, FRMn(ir) );

                     break;

                 case 8: /* FMOV.S  [Rm], FRn */

                     MEM_FP_READ( RM(ir), FRNn(ir) );

                     break;

                 case 9: /* FMOV.S  [Rm++], FRn */

                     MEM_FP_READ( RM(ir), FRNn(ir) );

                     RM(ir) += FP_WIDTH;

                     break;

                 case 10:/* FMOV.S  FRm, [Rn] */

                     MEM_FP_WRITE( RN(ir), FRMn(ir) );

                     break;

                 case 11:/* FMOV.S  FRm, [--Rn] */

                     RN(ir) -= FP_WIDTH;

                     MEM_FP_WRITE( RN(ir), FRMn(ir) );

                     break;

                 case 12:/* FMOV    FRm, FRn */

 		    if( IS_FPU_DOUBLESIZE() )

 			DRN(ir) = DRM(ir);

 		    else

 			FRN(ir) = FRM(ir);

                     break;

                 case 13:

                     switch( (ir&0x00F0) >> 4 ) {

 		    case 0: /* FSTS    FPUL, FRn */

 			FRN(ir) = FPULf;

 			break;

 		    case 1: /* FLDS    FRn,FPUL */

 			FPULf = FRN(ir);

 			break;

 		    case 2: /* FLOAT   FPUL, FRn */

 			DRN(ir) = (float)FPULi;

 			break;

 		    case 3: /* FTRC    FRn, FPUL */

 			dtmp = DRN(ir);

 			if( dtmp >= MAX_INTF )

 			    FPULi = MAX_INT;

 			else if( dtmp <= MIN_INTF )

 			    FPULi = MIN_INT;

 			else 

 			    FPULi = (int32_t)dtmp;

 			break;

 		    case 4: /* FNEG    FRn */

 			DRN(ir) = -DRN(ir);

 			break;

 		    case 5: /* FABS    FRn */

 			DRN(ir) = fabs(DRN(ir));

 			break;

 		    case 6: /* FSQRT   FRn */

 			DRN(ir) = sqrt(DRN(ir));

 			break;

 		    case 7: /* FSRRA FRn */

 			/* NO-OP when PR=1 */

 			break;

 		    case 8: /* FLDI0   FRn */

 			DRN(ir) = 0.0;

 			break;

 		    case 9: /* FLDI1   FRn */

 			DRN(ir) = 1.0;

 			break;

 		    case 10: /* FCNVSD FPUL, DRn */

 			if( ! IS_FPU_DOUBLESIZE() )

 			    DRN(ir) = (double)FPULf;

 			break;

 		    case 11: /* FCNVDS DRn, FPUL */

 			if( ! IS_FPU_DOUBLESIZE() )

 			    FPULf = (float)DRN(ir);

 			break;

 		    case 14:/* FIPR    FVm, FVn */

 			/* NO-OP when PR=1 */

 			break;

 		    case 15:

 			if( (ir&0x0300) == 0x0100 ) { /* FTRV    XMTRX,FVn */

 			    /* NO-OP when PR=1 */

 			    break;

 			}

 			else if( (ir&0x0100) == 0 ) { /* FSCA    FPUL, DRn */	

 			    /* NO-OP when PR=1 */

 			    break;

 			}

 			else if( ir == 0xFBFD ) {

 			    /* FRCHG   */

 			    sh4r.fpscr ^= FPSCR_FR;

 			    break;

 			}

 			else if( ir == 0xF3FD ) {

 			    /* FSCHG   */

 			    sh4r.fpscr ^= FPSCR_SZ;

 			    break;

 			}

 		    default: UNDEF(ir);

                     }

                     break;

                 case 14:/* FMAC    FR0, FRm, FRn */

                     DRN(ir) += DRM(ir)*DR0;

                     break;

                 default: UNDEF(ir);

 		}

 	    } else { /* Single precision */

 		switch( ir&0x000F ) {

                 case 0: /* FADD    FRm, FRn */

                     FRN(ir) += FRM(ir);

                     break;

                 case 1: /* FSUB    FRm, FRn */

                     FRN(ir) -= FRM(ir);

                     break;

                 case 2: /* FMUL    FRm, FRn */

                     FRN(ir) = FRN(ir) * FRM(ir);

                     break;

                 case 3: /* FDIV    FRm, FRn */

                     FRN(ir) = FRN(ir) / FRM(ir);

                     break;

                 case 4: /* FCMP/EQ FRm, FRn */

                     sh4r.t = ( FRN(ir) == FRM(ir) ? 1 : 0 );

                     break;

                 case 5: /* FCMP/GT FRm, FRn */

                     sh4r.t = ( FRN(ir) > FRM(ir) ? 1 : 0 );

                     break;

                 case 6: /* FMOV.S  [Rm+R0], FRn */

                     MEM_FP_READ( RM(ir) + R0, FRNn(ir) );

                     break;

                 case 7: /* FMOV.S  FRm, [Rn+R0] */

                     MEM_FP_WRITE( RN(ir) + R0, FRMn(ir) );

                     break;

                 case 8: /* FMOV.S  [Rm], FRn */

                     MEM_FP_READ( RM(ir), FRNn(ir) );

                     break;

                 case 9: /* FMOV.S  [Rm++], FRn */

                     MEM_FP_READ( RM(ir), FRNn(ir) );

                     RM(ir) += FP_WIDTH;

                     break;

                 case 10:/* FMOV.S  FRm, [Rn] */

                     MEM_FP_WRITE( RN(ir), FRMn(ir) );

                     break;

                 case 11:/* FMOV.S  FRm, [--Rn] */

                     RN(ir) -= FP_WIDTH;

                     MEM_FP_WRITE( RN(ir), FRMn(ir) );

                     break;

                 case 12:/* FMOV    FRm, FRn */

 		    if( IS_FPU_DOUBLESIZE() )

 			DRN(ir) = DRM(ir);

 		    else

 			FRN(ir) = FRM(ir);

                     break;

                 case 13:

                     switch( (ir&0x00F0) >> 4 ) {

 		    case 0: /* FSTS    FPUL, FRn */

 			FRN(ir) = FPULf;

 			break;

 		    case 1: /* FLDS    FRn,FPUL */

 			FPULf = FRN(ir);

 			break;

 		    case 2: /* FLOAT   FPUL, FRn */

 			FRN(ir) = (float)FPULi;

 			break;

 		    case 3: /* FTRC    FRn, FPUL */

 			ftmp = FRN(ir);

 			if( ftmp >= MAX_INTF )

 			    FPULi = MAX_INT;

 			else if( ftmp <= MIN_INTF )

 			    FPULi = MIN_INT;

 			else

 			    FPULi = (int32_t)ftmp;

 			break;

 		    case 4: /* FNEG    FRn */

 			FRN(ir) = -FRN(ir);

 			break;

 		    case 5: /* FABS    FRn */

 			FRN(ir) = fabsf(FRN(ir));

 			break;

 		    case 6: /* FSQRT   FRn */

 			FRN(ir) = sqrtf(FRN(ir));

 			break;

 		    case 7: /* FSRRA FRn */

 			FRN(ir) = 1.0/sqrtf(FRN(ir));

 			break;

 		    case 8: /* FLDI0   FRn */

 			FRN(ir) = 0.0;

 			break;

 		    case 9: /* FLDI1   FRn */

 			FRN(ir) = 1.0;

 			break;

 		    case 10: /* FCNVSD FPUL, DRn */

 			break;

 		    case 11: /* FCNVDS DRn, FPUL */

 			break;

 		    case 14:/* FIPR    FVm, FVn */

                             /* FIXME: This is not going to be entirely accurate

                              * as the SH4 instruction is less precise. Also

                              * need to check for 0s and infinities.

                              */

                         {

                             int tmp2 = FVN(ir);

                             tmp = FVM(ir);

                             FR(tmp2+3) = FR(tmp)*FR(tmp2) +

                                 FR(tmp+1)*FR(tmp2+1) +

                                 FR(tmp+2)*FR(tmp2+2) +

                                 FR(tmp+3)*FR(tmp2+3);

                             break;

                         }

 		    case 15:

 			if( (ir&0x0300) == 0x0100 ) { /* FTRV    XMTRX,FVn */

 			    tmp = FVN(ir);

 			    float fv[4] = { FR(tmp), FR(tmp+1), FR(tmp+2), FR(tmp+3) };

 			    FR(tmp) = XF(0) * fv[0] + XF(4)*fv[1] +

 				XF(8)*fv[2] + XF(12)*fv[3];

 			    FR(tmp+1) = XF(1) * fv[0] + XF(5)*fv[1] +

 				XF(9)*fv[2] + XF(13)*fv[3];

 			    FR(tmp+2) = XF(2) * fv[0] + XF(6)*fv[1] +

 				XF(10)*fv[2] + XF(14)*fv[3];

 			    FR(tmp+3) = XF(3) * fv[0] + XF(7)*fv[1] +

 				XF(11)*fv[2] + XF(15)*fv[3];

 			    break;

 			}

 			else if( (ir&0x0100) == 0 ) { /* FSCA    FPUL, DRn */

 			    float angle = (((float)(short)(FPULi>>16)) +

 					   (((float)(FPULi&0xFFFF))/65536.0)) *

 				2 * M_PI;

 			    int reg = FRNn(ir);

 			    FR(reg) = sinf(angle);

 			    FR(reg+1) = cosf(angle);

 			    break;

 			}

 			else if( ir == 0xFBFD ) {

 			    /* FRCHG   */

 			    sh4r.fpscr ^= FPSCR_FR;

 			    break;

 			}

 			else if( ir == 0xF3FD ) {

 			    /* FSCHG   */

 			    sh4r.fpscr ^= FPSCR_SZ;

 			    break;

 			}

 		    default: UNDEF(ir);

                     }

                     break;

                 case 14:/* FMAC    FR0, FRm, FRn */

                     FRN(ir) += FRM(ir)*FR0;

                     break;

                 default: UNDEF(ir);

 		}

 	    }

 	    break;

     }

     sh4r.pc = sh4r.new_pc;

     sh4r.new_pc += 2;

     sh4r.in_delay_slot = 0;

 }