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lxdream.org :: lxdream/src/sh4/sh4core.c
lxdream 0.9.1
released Jun 29
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filename src/sh4/sh4core.c
changeset 84:b993a8d8fbf3
prev53:f2981805b929
next92:108450d84ce8
author nkeynes
date Sat Jan 21 11:38:36 2006 +0000 (14 years ago)
permissions -rw-r--r--
last change Fix double-precision floating point
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     1 /**
     2  * $Id: sh4core.c,v 1.18 2006-01-21 11:38:36 nkeynes Exp $
     3  * 
     4  * SH4 emulation core, and parent module for all the SH4 peripheral
     5  * modules.
     6  *
     7  * Copyright (c) 2005 Nathan Keynes.
     8  *
     9  * This program is free software; you can redistribute it and/or modify
    10  * it under the terms of the GNU General Public License as published by
    11  * the Free Software Foundation; either version 2 of the License, or
    12  * (at your option) any later version.
    13  *
    14  * This program is distributed in the hope that it will be useful,
    15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    17  * GNU General Public License for more details.
    18  */
    20 #define MODULE sh4_module
    21 #include <math.h>
    22 #include "dream.h"
    23 #include "sh4/sh4core.h"
    24 #include "sh4/sh4mmio.h"
    25 #include "sh4/intc.h"
    26 #include "mem.h"
    27 #include "clock.h"
    28 #include "bios.h"
    30 /* CPU-generated exception code/vector pairs */
    31 #define EXC_POWER_RESET  0x000 /* vector special */
    32 #define EXC_MANUAL_RESET 0x020
    33 #define EXC_SLOT_ILLEGAL 0x1A0
    34 #define EXC_ILLEGAL      0x180
    35 #define EXV_ILLEGAL      0x100
    36 #define EXC_TRAP         0x160
    37 #define EXV_TRAP         0x100
    38 #define EXC_FPDISABLE    0x800
    39 #define EXV_FPDISABLE    0x100
    41 /********************** SH4 Module Definition ****************************/
    43 void sh4_init( void );
    44 void sh4_reset( void );
    45 uint32_t sh4_run_slice( uint32_t );
    46 void sh4_start( void );
    47 void sh4_stop( void );
    48 void sh4_save_state( FILE *f );
    49 int sh4_load_state( FILE *f );
    51 struct dreamcast_module sh4_module = { "SH4", sh4_init, sh4_reset, 
    52 				       NULL, sh4_run_slice, sh4_stop,
    53 				       sh4_save_state, sh4_load_state };
    55 struct sh4_registers sh4r;
    57 void sh4_init(void)
    58 {
    59     register_io_regions( mmio_list_sh4mmio );
    60     mmu_init();
    61     sh4_reset();
    62 }
    64 void sh4_reset(void)
    65 {
    66     /* zero everything out, for the sake of having a consistent state. */
    67     memset( &sh4r, 0, sizeof(sh4r) );
    69     /* Resume running if we were halted */
    70     sh4r.sh4_state = SH4_STATE_RUNNING;
    72     sh4r.pc    = 0xA0000000;
    73     sh4r.new_pc= 0xA0000002;
    74     sh4r.vbr   = 0x00000000;
    75     sh4r.fpscr = 0x00040001;
    76     sh4r.sr    = 0x700000F0;
    78     /* Mem reset will do this, but if we want to reset _just_ the SH4... */
    79     MMIO_WRITE( MMU, EXPEVT, EXC_POWER_RESET );
    81     /* Peripheral modules */
    82     intc_reset();
    83     SCIF_reset();
    84 }
    86 static struct breakpoint_struct sh4_breakpoints[MAX_BREAKPOINTS];
    87 static int sh4_breakpoint_count = 0;
    89 void sh4_set_breakpoint( uint32_t pc, int type )
    90 {
    91     sh4_breakpoints[sh4_breakpoint_count].address = pc;
    92     sh4_breakpoints[sh4_breakpoint_count].type = type;
    93     sh4_breakpoint_count++;
    94 }
    96 gboolean sh4_clear_breakpoint( uint32_t pc, int type )
    97 {
    98     int i;
   100     for( i=0; i<sh4_breakpoint_count; i++ ) {
   101 	if( sh4_breakpoints[i].address == pc && 
   102 	    sh4_breakpoints[i].type == type ) {
   103 	    while( ++i < sh4_breakpoint_count ) {
   104 		sh4_breakpoints[i-1].address = sh4_breakpoints[i].address;
   105 		sh4_breakpoints[i-1].type = sh4_breakpoints[i].type;
   106 	    }
   107 	    sh4_breakpoint_count--;
   108 	    return TRUE;
   109 	}
   110     }
   111     return FALSE;
   112 }
   114 int sh4_get_breakpoint( uint32_t pc )
   115 {
   116     int i;
   117     for( i=0; i<sh4_breakpoint_count; i++ ) {
   118 	if( sh4_breakpoints[i].address == pc )
   119 	    return sh4_breakpoints[i].type;
   120     }
   121     return 0;
   122 }
   124 uint32_t sh4_run_slice( uint32_t nanosecs ) 
   125 {
   126     int target = sh4r.icount + nanosecs / sh4_cpu_period;
   127     int start = sh4r.icount;
   128     int i;
   130     if( sh4r.sh4_state != SH4_STATE_RUNNING ) {
   131 	if( sh4r.int_pending != 0 )
   132 	    sh4r.sh4_state = SH4_STATE_RUNNING;;
   133     }
   135     for( sh4r.slice_cycle = 0; sh4r.slice_cycle < nanosecs; sh4r.slice_cycle += sh4_cpu_period ) {
   136 	if( !sh4_execute_instruction() )
   137 	    break;
   138 #ifdef ENABLE_DEBUG_MODE
   139 	for( i=0; i<sh4_breakpoint_count; i++ ) {
   140 	    if( sh4_breakpoints[i].address == sh4r.pc ) {
   141 		break;
   142 	    }
   143 	}
   144 	if( i != sh4_breakpoint_count ) {
   145 	    dreamcast_stop();
   146 	    if( sh4_breakpoints[i].type == BREAK_ONESHOT )
   147 		sh4_clear_breakpoint( sh4r.pc, BREAK_ONESHOT );
   148 	    break;
   149 	}
   150 #endif	
   151     }
   153     /* If we aborted early, but the cpu is still technically running,
   154      * we're doing a hard abort - cut the timeslice back to what we
   155      * actually executed
   156      */
   157     if( sh4r.slice_cycle != nanosecs && sh4r.sh4_state == SH4_STATE_RUNNING ) {
   158 	nanosecs = sh4r.slice_cycle;
   159     }
   160     if( sh4r.sh4_state != SH4_STATE_STANDBY ) {
   161 	TMU_run_slice( nanosecs );
   162 	SCIF_run_slice( nanosecs );
   163     }
   164     sh4r.icount += sh4r.slice_cycle / sh4_cpu_period;
   165     return nanosecs;
   166 }
   168 void sh4_stop(void)
   169 {
   171 }
   173 void sh4_save_state( FILE *f )
   174 {
   175     fwrite( &sh4r, sizeof(sh4r), 1, f );
   176     TMU_save_state( f );
   177     SCIF_save_state( f );
   178 }
   180 int sh4_load_state( FILE * f )
   181 {
   182     fread( &sh4r, sizeof(sh4r), 1, f );
   183     TMU_load_state( f );
   184     return SCIF_load_state( f );
   185 }
   187 /********************** SH4 emulation core  ****************************/
   189 void sh4_set_pc( int pc )
   190 {
   191     sh4r.pc = pc;
   192     sh4r.new_pc = pc+2;
   193 }
   195 #define UNDEF(ir) do{ ERROR( "Raising exception on undefined instruction at %08x, opcode = %04x", sh4r.pc, ir ); RAISE( EXC_ILLEGAL, EXV_ILLEGAL ); }while(0)
   196 #define UNIMP(ir) do{ ERROR( "Halted on unimplemented instruction at %08x, opcode = %04x", sh4r.pc, ir ); dreamcast_stop(); return FALSE; }while(0)
   198 #define RAISE( x, v ) do{ \
   199     if( sh4r.vbr == 0 ) { \
   200         ERROR( "%08X: VBR not initialized while raising exception %03X, halting", sh4r.pc, x ); \
   201         sh4_stop(); \
   202     } else { \
   203         sh4r.spc = sh4r.pc + 2; \
   204         sh4r.ssr = sh4_read_sr(); \
   205         sh4r.sgr = sh4r.r[15]; \
   206         MMIO_WRITE(MMU,EXPEVT,x); \
   207         sh4r.pc = sh4r.vbr + v; \
   208         sh4r.new_pc = sh4r.pc + 2; \
   209         sh4_load_sr( sh4r.ssr |SR_MD|SR_BL|SR_RB ); \
   210     } \
   211     return TRUE; } while(0)
   213 #define MEM_READ_BYTE( addr ) sh4_read_byte(addr)
   214 #define MEM_READ_WORD( addr ) sh4_read_word(addr)
   215 #define MEM_READ_LONG( addr ) sh4_read_long(addr)
   216 #define MEM_WRITE_BYTE( addr, val ) sh4_write_byte(addr, val)
   217 #define MEM_WRITE_WORD( addr, val ) sh4_write_word(addr, val)
   218 #define MEM_WRITE_LONG( addr, val ) sh4_write_long(addr, val)
   220 #define MEM_FR_READ( addr, reg ) *((uint32_t *)&FR(reg)) = sh4_read_long(addr)
   222 #define MEM_DR_READ( addr, reg ) do { \
   223 	*((uint32_t *)&FR((reg) & 0x0E)) = sh4_read_long(addr);		\
   224 	*((uint32_t *)&FR((reg) | 0x01)) = sh4_read_long(addr+4); } while(0)
   226 #define MEM_FR_WRITE( addr, reg ) sh4_write_long( addr, *((uint32_t *)&FR((reg))) )
   228 #define MEM_DR_WRITE( addr, reg ) do { \
   229 	sh4_write_long( addr, *((uint32_t *)&FR((reg)&0x0E)) );	\
   230 	sh4_write_long( addr+4, *((uint32_t *)&FR((reg)|0x01)) ); } while(0)
   232 #define FP_WIDTH (IS_FPU_DOUBLESIZE() ? 8 : 4)
   234 #define MEM_FP_READ( addr, reg ) if( IS_FPU_DOUBLESIZE() ) MEM_DR_READ(addr, reg ); else MEM_FR_READ( addr, reg )
   236 #define MEM_FP_WRITE( addr, reg ) if( IS_FPU_DOUBLESIZE() ) MEM_DR_WRITE(addr, reg ); else MEM_FR_WRITE( addr, reg )
   238 #define CHECK( x, c, v ) if( !x ) RAISE( c, v )
   239 #define CHECKPRIV() CHECK( IS_SH4_PRIVMODE(), EXC_ILLEGAL, EXV_ILLEGAL )
   240 #define CHECKFPUEN() CHECK( IS_FPU_ENABLED(), EXC_FPDISABLE, EXV_FPDISABLE )
   241 #define CHECKDEST(p) if( (p) == 0 ) { ERROR( "%08X: Branch/jump to NULL, CPU halted", sh4r.pc ); dreamcast_stop(); return FALSE; }
   242 #define CHECKSLOTILLEGAL() if(sh4r.in_delay_slot) { RAISE(EXC_SLOT_ILLEGAL,EXV_ILLEGAL); }
   244 static void sh4_switch_banks( )
   245 {
   246     uint32_t tmp[8];
   248     memcpy( tmp, sh4r.r, sizeof(uint32_t)*8 );
   249     memcpy( sh4r.r, sh4r.r_bank, sizeof(uint32_t)*8 );
   250     memcpy( sh4r.r_bank, tmp, sizeof(uint32_t)*8 );
   251 }
   253 static void sh4_load_sr( uint32_t newval )
   254 {
   255     if( (newval ^ sh4r.sr) & SR_RB )
   256         sh4_switch_banks();
   257     sh4r.sr = newval;
   258     sh4r.t = (newval&SR_T) ? 1 : 0;
   259     sh4r.s = (newval&SR_S) ? 1 : 0;
   260     sh4r.m = (newval&SR_M) ? 1 : 0;
   261     sh4r.q = (newval&SR_Q) ? 1 : 0;
   262     intc_mask_changed();
   263 }
   265 static uint32_t sh4_read_sr( void )
   266 {
   267     /* synchronize sh4r.sr with the various bitflags */
   268     sh4r.sr &= SR_MQSTMASK;
   269     if( sh4r.t ) sh4r.sr |= SR_T;
   270     if( sh4r.s ) sh4r.sr |= SR_S;
   271     if( sh4r.m ) sh4r.sr |= SR_M;
   272     if( sh4r.q ) sh4r.sr |= SR_Q;
   273     return sh4r.sr;
   274 }
   275 /* function for external use */
   276 void sh4_raise_exception( int code, int vector )
   277 {
   278     RAISE(code, vector);
   279 }
   281 static void sh4_accept_interrupt( void )
   282 {
   283     uint32_t code = intc_accept_interrupt();
   284     sh4r.ssr = sh4_read_sr();
   285     sh4r.spc = sh4r.pc;
   286     sh4r.sgr = sh4r.r[15];
   287     sh4_load_sr( sh4r.ssr|SR_BL|SR_MD|SR_RB );
   288     MMIO_WRITE( MMU, INTEVT, code );
   289     sh4r.pc = sh4r.vbr + 0x600;
   290     sh4r.new_pc = sh4r.pc + 2;
   291     WARN( "Accepting interrupt %03X, from %08X => %08X", code, sh4r.spc, sh4r.pc );
   292 }
   294 gboolean sh4_execute_instruction( void )
   295 {
   296     uint32_t pc;
   297     unsigned short ir;
   298     uint32_t tmp;
   299     uint64_t tmpl;
   301 #define R0 sh4r.r[0]
   302 #define FR0 FR(0)
   303 #define DR0 DR(0)
   304 #define RN(ir) sh4r.r[(ir&0x0F00)>>8]
   305 #define RN_BANK(ir) sh4r.r_bank[(ir&0x0070)>>4]
   306 #define RM(ir) sh4r.r[(ir&0x00F0)>>4]
   307 #define DISP4(ir) (ir&0x000F) /* 4-bit displacements are *NOT* sign-extended */
   308 #define DISP8(ir) (ir&0x00FF)
   309 #define PCDISP8(ir) SIGNEXT8(ir&0x00FF)
   310 #define IMM8(ir) SIGNEXT8(ir&0x00FF)
   311 #define UIMM8(ir) (ir&0x00FF) /* Unsigned immmediate */
   312 #define DISP12(ir) SIGNEXT12(ir&0x0FFF)
   313 #define FRNn(ir) ((ir&0x0F00)>>8)
   314 #define FRMn(ir) ((ir&0x00F0)>>4)
   315 #define DRNn(ir) ((ir&0x0E00)>>9)
   316 #define DRMn(ir) ((ir&0x00E0)>>5)
   317 #define FVN(ir) ((ir&0x0C00)>>8)
   318 #define FVM(ir) ((ir&0x0300)>>6)
   319 #define FRN(ir) FR(FRNn(ir))
   320 #define FRM(ir) FR(FRMn(ir))
   321 #define FRNi(ir) (*((uint32_t *)&FR(FRNn(ir))))
   322 #define FRMi(ir) (*((uint32_t *)&FR(FRMn(ir))))
   323 #define DRN(ir) DR(DRNn(ir))
   324 #define DRM(ir) DR(DRMn(ir))
   325 #define DRNi(ir) (*((uint64_t *)&DR(FRNn(ir))))
   326 #define DRMi(ir) (*((uint64_t *)&DR(FRMn(ir))))
   327 #define FPULf   *((float *)&sh4r.fpul)
   328 #define FPULi    (sh4r.fpul)
   330     if( SH4_INT_PENDING() ) 
   331         sh4_accept_interrupt();
   333     pc = sh4r.pc;
   334     if( pc > 0xFFFFFF00 ) {
   335 	/* SYSCALL Magic */
   336 	bios_syscall( pc & 0xFF );
   337 	sh4r.in_delay_slot = 1;
   338 	pc = sh4r.pc = sh4r.pr;
   339 	sh4r.new_pc = sh4r.pc + 2;
   340     }
   341     ir = MEM_READ_WORD(pc);
   342     sh4r.icount++;
   344     switch( (ir&0xF000)>>12 ) {
   345         case 0: /* 0000nnnnmmmmxxxx */
   346             switch( ir&0x000F ) {
   347                 case 2:
   348                     switch( (ir&0x00F0)>>4 ) {
   349                         case 0: /* STC     SR, Rn */
   350                             CHECKPRIV();
   351                             RN(ir) = sh4_read_sr();
   352                             break;
   353                         case 1: /* STC     GBR, Rn */
   354                             RN(ir) = sh4r.gbr;
   355                             break;
   356                         case 2: /* STC     VBR, Rn */
   357                             CHECKPRIV();
   358                             RN(ir) = sh4r.vbr;
   359                             break;
   360                         case 3: /* STC     SSR, Rn */
   361                             CHECKPRIV();
   362                             RN(ir) = sh4r.ssr;
   363                             break;
   364                         case 4: /* STC     SPC, Rn */
   365                             CHECKPRIV();
   366                             RN(ir) = sh4r.spc;
   367                             break;
   368                         case 8: case 9: case 10: case 11: case 12: case 13:
   369                         case 14: case 15:/* STC     Rm_bank, Rn */
   370                             CHECKPRIV();
   371                             RN(ir) = RN_BANK(ir);
   372                             break;
   373                         default: UNDEF(ir);
   374                     }
   375                     break;
   376                 case 3:
   377                     switch( (ir&0x00F0)>>4 ) {
   378                         case 0: /* BSRF    Rn */
   379                             CHECKDEST( pc + 4 + RN(ir) );
   380                             CHECKSLOTILLEGAL();
   381                             sh4r.in_delay_slot = 1;
   382                             sh4r.pr = sh4r.pc + 4;
   383                             sh4r.pc = sh4r.new_pc;
   384                             sh4r.new_pc = pc + 4 + RN(ir);
   385                             return TRUE;
   386                         case 2: /* BRAF    Rn */
   387                             CHECKDEST( pc + 4 + RN(ir) );
   388                             CHECKSLOTILLEGAL();
   389                             sh4r.in_delay_slot = 1;
   390                             sh4r.pc = sh4r.new_pc;
   391                             sh4r.new_pc = pc + 4 + RN(ir);
   392                             return TRUE;
   393                         case 8: /* PREF    [Rn] */
   394                             tmp = RN(ir);
   395                             if( (tmp & 0xFC000000) == 0xE0000000 ) {
   396                                 /* Store queue operation */
   397                                 int queue = (tmp&0x20)>>2;
   398                                 int32_t *src = &sh4r.store_queue[queue];
   399                                 uint32_t hi = (MMIO_READ( MMU, (queue == 0 ? QACR0 : QACR1) ) & 0x1C) << 24;
   400                                 uint32_t target = tmp&0x03FFFFE0 | hi;
   401                                 mem_copy_to_sh4( target, src, 32 );
   402 				//				WARN( "Executed SQ%c => %08X",
   403 				//				      (queue == 0 ? '0' : '1'), target );
   404                             }
   405                             break;
   406                         case 9: /* OCBI    [Rn] */
   407                         case 10:/* OCBP    [Rn] */
   408                         case 11:/* OCBWB   [Rn] */
   409                             /* anything? */
   410                             break;
   411                         case 12:/* MOVCA.L R0, [Rn] */
   412                             UNIMP(ir);
   413                         default: UNDEF(ir);
   414                     }
   415                     break;
   416                 case 4: /* MOV.B   Rm, [R0 + Rn] */
   417                     MEM_WRITE_BYTE( R0 + RN(ir), RM(ir) );
   418                     break;
   419                 case 5: /* MOV.W   Rm, [R0 + Rn] */
   420                     MEM_WRITE_WORD( R0 + RN(ir), RM(ir) );
   421                     break;
   422                 case 6: /* MOV.L   Rm, [R0 + Rn] */
   423                     MEM_WRITE_LONG( R0 + RN(ir), RM(ir) );
   424                     break;
   425                 case 7: /* MUL.L   Rm, Rn */
   426                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |
   427                         (RM(ir) * RN(ir));
   428                     break;
   429                 case 8: 
   430                     switch( (ir&0x0FF0)>>4 ) {
   431                         case 0: /* CLRT    */
   432                             sh4r.t = 0;
   433                             break;
   434                         case 1: /* SETT    */
   435                             sh4r.t = 1;
   436                             break;
   437                         case 2: /* CLRMAC  */
   438                             sh4r.mac = 0;
   439                             break;
   440                         case 3: /* LDTLB   */
   441                             break;
   442                         case 4: /* CLRS    */
   443                             sh4r.s = 0;
   444                             break;
   445                         case 5: /* SETS    */
   446                             sh4r.s = 1;
   447                             break;
   448                         default: UNDEF(ir);
   449                     }
   450                     break;
   451                 case 9: 
   452                     if( (ir&0x00F0) == 0x20 ) /* MOVT    Rn */
   453                         RN(ir) = sh4r.t;
   454                     else if( ir == 0x0019 ) /* DIV0U   */
   455                         sh4r.m = sh4r.q = sh4r.t = 0;
   456                     else if( ir == 0x0009 )
   457                         /* NOP     */;
   458                     else UNDEF(ir);
   459                     break;
   460                 case 10:
   461                     switch( (ir&0x00F0) >> 4 ) {
   462                         case 0: /* STS     MACH, Rn */
   463                             RN(ir) = sh4r.mac >> 32;
   464                             break;
   465                         case 1: /* STS     MACL, Rn */
   466                             RN(ir) = (uint32_t)sh4r.mac;
   467                             break;
   468                         case 2: /* STS     PR, Rn */
   469                             RN(ir) = sh4r.pr;
   470                             break;
   471                         case 3: /* STC     SGR, Rn */
   472                             CHECKPRIV();
   473                             RN(ir) = sh4r.sgr;
   474                             break;
   475                         case 5:/* STS      FPUL, Rn */
   476                             RN(ir) = sh4r.fpul;
   477                             break;
   478                         case 6: /* STS     FPSCR, Rn */
   479                             RN(ir) = sh4r.fpscr;
   480                             break;
   481                         case 15:/* STC     DBR, Rn */
   482                             CHECKPRIV();
   483                             RN(ir) = sh4r.dbr;
   484                             break;
   485                         default: UNDEF(ir);
   486                     }
   487                     break;
   488                 case 11:
   489                     switch( (ir&0x0FF0)>>4 ) {
   490                         case 0: /* RTS     */
   491                             CHECKDEST( sh4r.pr );
   492                             CHECKSLOTILLEGAL();
   493                             sh4r.in_delay_slot = 1;
   494                             sh4r.pc = sh4r.new_pc;
   495                             sh4r.new_pc = sh4r.pr;
   496                             return TRUE;
   497                         case 1: /* SLEEP   */
   498 			    if( MMIO_READ( CPG, STBCR ) & 0x80 ) {
   499 				sh4r.sh4_state = SH4_STATE_STANDBY;
   500 			    } else {
   501 				sh4r.sh4_state = SH4_STATE_SLEEP;
   502 			    }
   503 			    return FALSE; /* Halt CPU */
   504                         case 2: /* RTE     */
   505                             CHECKPRIV();
   506                             CHECKDEST( sh4r.spc );
   507                             CHECKSLOTILLEGAL();
   508                             sh4r.in_delay_slot = 1;
   509                             sh4r.pc = sh4r.new_pc;
   510                             sh4r.new_pc = sh4r.spc;
   511                             sh4_load_sr( sh4r.ssr );
   512                             return TRUE;
   513                         default:UNDEF(ir);
   514                     }
   515                     break;
   516                 case 12:/* MOV.B   [R0+R%d], R%d */
   517                     RN(ir) = MEM_READ_BYTE( R0 + RM(ir) );
   518                     break;
   519                 case 13:/* MOV.W   [R0+R%d], R%d */
   520                     RN(ir) = MEM_READ_WORD( R0 + RM(ir) );
   521                     break;
   522                 case 14:/* MOV.L   [R0+R%d], R%d */
   523                     RN(ir) = MEM_READ_LONG( R0 + RM(ir) );
   524                     break;
   525                 case 15:/* MAC.L   [Rm++], [Rn++] */
   526                     tmpl = ( SIGNEXT32(MEM_READ_LONG(RM(ir))) *
   527                                   SIGNEXT32(MEM_READ_LONG(RN(ir))) );
   528                     if( sh4r.s ) {
   529                         /* 48-bit Saturation. Yuch */
   530                         tmpl += SIGNEXT48(sh4r.mac);
   531                         if( tmpl < 0xFFFF800000000000LL )
   532                             tmpl = 0xFFFF800000000000LL;
   533                         else if( tmpl > 0x00007FFFFFFFFFFFLL )
   534                             tmpl = 0x00007FFFFFFFFFFFLL;
   535                         sh4r.mac = (sh4r.mac&0xFFFF000000000000LL) |
   536                             (tmpl&0x0000FFFFFFFFFFFFLL);
   537                     } else sh4r.mac = tmpl;
   539                     RM(ir) += 4;
   540                     RN(ir) += 4;
   542                     break;
   543                 default: UNDEF(ir);
   544             }
   545             break;
   546         case 1: /* 0001nnnnmmmmdddd */
   547             /* MOV.L   Rm, [Rn + disp4*4] */
   548             MEM_WRITE_LONG( RN(ir) + (DISP4(ir)<<2), RM(ir) );
   549             break;
   550         case 2: /* 0010nnnnmmmmxxxx */
   551             switch( ir&0x000F ) {
   552                 case 0: /* MOV.B   Rm, [Rn] */
   553                     MEM_WRITE_BYTE( RN(ir), RM(ir) );
   554                     break;
   555                 case 1: /* MOV.W   Rm, [Rn] */
   556                     MEM_WRITE_WORD( RN(ir), RM(ir) );
   557                     break;
   558                 case 2: /* MOV.L   Rm, [Rn] */
   559                     MEM_WRITE_LONG( RN(ir), RM(ir) );
   560                     break;
   561                 case 3: UNDEF(ir);
   562                     break;
   563                 case 4: /* MOV.B   Rm, [--Rn] */
   564                     RN(ir) --;
   565                     MEM_WRITE_BYTE( RN(ir), RM(ir) );
   566                     break;
   567                 case 5: /* MOV.W   Rm, [--Rn] */
   568                     RN(ir) -= 2;
   569                     MEM_WRITE_WORD( RN(ir), RM(ir) );
   570                     break;
   571                 case 6: /* MOV.L   Rm, [--Rn] */
   572                     RN(ir) -= 4;
   573                     MEM_WRITE_LONG( RN(ir), RM(ir) );
   574                     break;
   575                 case 7: /* DIV0S   Rm, Rn */
   576                     sh4r.q = RN(ir)>>31;
   577                     sh4r.m = RM(ir)>>31;
   578                     sh4r.t = sh4r.q ^ sh4r.m;
   579                     break;
   580                 case 8: /* TST     Rm, Rn */
   581                     sh4r.t = (RN(ir)&RM(ir) ? 0 : 1);
   582                     break;
   583                 case 9: /* AND     Rm, Rn */
   584                     RN(ir) &= RM(ir);
   585                     break;
   586                 case 10:/* XOR     Rm, Rn */
   587                     RN(ir) ^= RM(ir);
   588                     break;
   589                 case 11:/* OR      Rm, Rn */
   590                     RN(ir) |= RM(ir);
   591                     break;
   592                 case 12:/* CMP/STR Rm, Rn */
   593                     /* set T = 1 if any byte in RM & RN is the same */
   594                     tmp = RM(ir) ^ RN(ir);
   595                     sh4r.t = ((tmp&0x000000FF)==0 || (tmp&0x0000FF00)==0 ||
   596                               (tmp&0x00FF0000)==0 || (tmp&0xFF000000)==0)?1:0;
   597                     break;
   598                 case 13:/* XTRCT   Rm, Rn */
   599                     RN(ir) = (RN(ir)>>16) | (RM(ir)<<16);
   600                     break;
   601                 case 14:/* MULU.W  Rm, Rn */
   602                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |
   603                         (uint32_t)((RM(ir)&0xFFFF) * (RN(ir)&0xFFFF));
   604                     break;
   605                 case 15:/* MULS.W  Rm, Rn */
   606                     sh4r.mac = (sh4r.mac&0xFFFFFFFF00000000LL) |
   607                         (uint32_t)(SIGNEXT32(RM(ir)&0xFFFF) * SIGNEXT32(RN(ir)&0xFFFF));
   608                     break;
   609             }
   610             break;
   611         case 3: /* 0011nnnnmmmmxxxx */
   612             switch( ir&0x000F ) {
   613                 case 0: /* CMP/EQ  Rm, Rn */
   614                     sh4r.t = ( RM(ir) == RN(ir) ? 1 : 0 );
   615                     break;
   616                 case 2: /* CMP/HS  Rm, Rn */
   617                     sh4r.t = ( RN(ir) >= RM(ir) ? 1 : 0 );
   618                     break;
   619                 case 3: /* CMP/GE  Rm, Rn */
   620                     sh4r.t = ( ((int32_t)RN(ir)) >= ((int32_t)RM(ir)) ? 1 : 0 );
   621                     break;
   622                 case 4: { /* DIV1    Rm, Rn */
   623                     /* This is just from the sh4p manual with some
   624                      * simplifications (someone want to check it's correct? :)
   625                      * Why they couldn't just provide a real DIV instruction...
   626                      * Please oh please let the translator batch these things
   627                      * up into a single DIV... */
   628                     uint32_t tmp0, tmp1, tmp2, dir;
   630                     dir = sh4r.q ^ sh4r.m;
   631                     sh4r.q = (RN(ir) >> 31);
   632                     tmp2 = RM(ir);
   633                     RN(ir) = (RN(ir) << 1) | sh4r.t;
   634                     tmp0 = RN(ir);
   635                     if( dir ) {
   636                         RN(ir) += tmp2;
   637                         tmp1 = (RN(ir)<tmp0 ? 1 : 0 );
   638                     } else {
   639                         RN(ir) -= tmp2;
   640                         tmp1 = (RN(ir)>tmp0 ? 1 : 0 );
   641                     }
   642                     sh4r.q ^= sh4r.m ^ tmp1;
   643                     sh4r.t = ( sh4r.q == sh4r.m ? 1 : 0 );
   644                     break; }
   645                 case 5: /* DMULU.L Rm, Rn */
   646                     sh4r.mac = ((uint64_t)RM(ir)) * ((uint64_t)RN(ir));
   647                     break;
   648                 case 6: /* CMP/HI  Rm, Rn */
   649                     sh4r.t = ( RN(ir) > RM(ir) ? 1 : 0 );
   650                     break;
   651                 case 7: /* CMP/GT  Rm, Rn */
   652                     sh4r.t = ( ((int32_t)RN(ir)) > ((int32_t)RM(ir)) ? 1 : 0 );
   653                     break;
   654                 case 8: /* SUB     Rm, Rn */
   655                     RN(ir) -= RM(ir);
   656                     break;
   657                 case 10:/* SUBC    Rm, Rn */
   658                     tmp = RN(ir);
   659                     RN(ir) = RN(ir) - RM(ir) - sh4r.t;
   660                     sh4r.t = (RN(ir) > tmp || (RN(ir) == tmp && sh4r.t == 1));
   661                     break;
   662                 case 11:/* SUBV    Rm, Rn */
   663                     UNIMP(ir);
   664                     break;
   665                 case 12:/* ADD     Rm, Rn */
   666                     RN(ir) += RM(ir);
   667                     break;
   668                 case 13:/* DMULS.L Rm, Rn */
   669                     sh4r.mac = SIGNEXT32(RM(ir)) * SIGNEXT32(RN(ir));
   670                     break;
   671                 case 14:/* ADDC    Rm, Rn */
   672                     tmp = RN(ir);
   673                     RN(ir) += RM(ir) + sh4r.t;
   674                     sh4r.t = ( RN(ir) < tmp || (RN(ir) == tmp && sh4r.t != 0) ? 1 : 0 );
   675                     break;
   676                 case 15:/* ADDV    Rm, Rn */
   677                     UNIMP(ir);
   678                     break;
   679                 default: UNDEF(ir);
   680             }
   681             break;
   682         case 4: /* 0100nnnnxxxxxxxx */
   683             switch( ir&0x00FF ) {
   684                 case 0x00: /* SHLL    Rn */
   685                     sh4r.t = RN(ir) >> 31;
   686                     RN(ir) <<= 1;
   687                     break;
   688                 case 0x01: /* SHLR    Rn */
   689                     sh4r.t = RN(ir) & 0x00000001;
   690                     RN(ir) >>= 1;
   691                     break;
   692                 case 0x02: /* STS.L   MACH, [--Rn] */
   693                     RN(ir) -= 4;
   694                     MEM_WRITE_LONG( RN(ir), (sh4r.mac>>32) );
   695                     break;
   696                 case 0x03: /* STC.L   SR, [--Rn] */
   697                     CHECKPRIV();
   698                     RN(ir) -= 4;
   699                     MEM_WRITE_LONG( RN(ir), sh4_read_sr() );
   700                     break;
   701                 case 0x04: /* ROTL    Rn */
   702                     sh4r.t = RN(ir) >> 31;
   703                     RN(ir) <<= 1;
   704                     RN(ir) |= sh4r.t;
   705                     break;
   706                 case 0x05: /* ROTR    Rn */
   707                     sh4r.t = RN(ir) & 0x00000001;
   708                     RN(ir) >>= 1;
   709                     RN(ir) |= (sh4r.t << 31);
   710                     break;
   711                 case 0x06: /* LDS.L   [Rn++], MACH */
   712                     sh4r.mac = (sh4r.mac & 0x00000000FFFFFFFF) |
   713                         (((uint64_t)MEM_READ_LONG(RN(ir)))<<32);
   714                     RN(ir) += 4;
   715                     break;
   716                 case 0x07: /* LDC.L   [Rn++], SR */
   717                     CHECKPRIV();
   718                     sh4_load_sr( MEM_READ_LONG(RN(ir)) );
   719                     RN(ir) +=4;
   720                     break;
   721                 case 0x08: /* SHLL2   Rn */
   722                     RN(ir) <<= 2;
   723                     break;
   724                 case 0x09: /* SHLR2   Rn */
   725                     RN(ir) >>= 2;
   726                     break;
   727                 case 0x0A: /* LDS     Rn, MACH */
   728                     sh4r.mac = (sh4r.mac & 0x00000000FFFFFFFF) |
   729                         (((uint64_t)RN(ir))<<32);
   730                     break;
   731                 case 0x0B: /* JSR     [Rn] */
   732                     CHECKDEST( RN(ir) );
   733                     CHECKSLOTILLEGAL();
   734                     sh4r.in_delay_slot = 1;
   735                     sh4r.pc = sh4r.new_pc;
   736                     sh4r.new_pc = RN(ir);
   737                     sh4r.pr = pc + 4;
   738                     return TRUE;
   739                 case 0x0E: /* LDC     Rn, SR */
   740                     CHECKPRIV();
   741                     sh4_load_sr( RN(ir) );
   742                     break;
   743                 case 0x10: /* DT      Rn */
   744                     RN(ir) --;
   745                     sh4r.t = ( RN(ir) == 0 ? 1 : 0 );
   746                     break;
   747                 case 0x11: /* CMP/PZ  Rn */
   748                     sh4r.t = ( ((int32_t)RN(ir)) >= 0 ? 1 : 0 );
   749                     break;
   750                 case 0x12: /* STS.L   MACL, [--Rn] */
   751                     RN(ir) -= 4;
   752                     MEM_WRITE_LONG( RN(ir), (uint32_t)sh4r.mac );
   753                     break;
   754                 case 0x13: /* STC.L   GBR, [--Rn] */
   755                     RN(ir) -= 4;
   756                     MEM_WRITE_LONG( RN(ir), sh4r.gbr );
   757                     break;
   758                 case 0x15: /* CMP/PL  Rn */
   759                     sh4r.t = ( ((int32_t)RN(ir)) > 0 ? 1 : 0 );
   760                     break;
   761                 case 0x16: /* LDS.L   [Rn++], MACL */
   762                     sh4r.mac = (sh4r.mac & 0xFFFFFFFF00000000LL) |
   763                         (uint64_t)((uint32_t)MEM_READ_LONG(RN(ir)));
   764                     RN(ir) += 4;
   765                     break;
   766                 case 0x17: /* LDC.L   [Rn++], GBR */
   767                     sh4r.gbr = MEM_READ_LONG(RN(ir));
   768                     RN(ir) +=4;
   769                     break;
   770                 case 0x18: /* SHLL8   Rn */
   771                     RN(ir) <<= 8;
   772                     break;
   773                 case 0x19: /* SHLR8   Rn */
   774                     RN(ir) >>= 8;
   775                     break;
   776                 case 0x1A: /* LDS     Rn, MACL */
   777                     sh4r.mac = (sh4r.mac & 0xFFFFFFFF00000000LL) |
   778                         (uint64_t)((uint32_t)(RN(ir)));
   779                     break;
   780                 case 0x1B: /* TAS.B   [Rn] */
   781                     tmp = MEM_READ_BYTE( RN(ir) );
   782                     sh4r.t = ( tmp == 0 ? 1 : 0 );
   783                     MEM_WRITE_BYTE( RN(ir), tmp | 0x80 );
   784                     break;
   785                 case 0x1E: /* LDC     Rn, GBR */
   786                     sh4r.gbr = RN(ir);
   787                     break;
   788                 case 0x20: /* SHAL    Rn */
   789                     sh4r.t = RN(ir) >> 31;
   790                     RN(ir) <<= 1;
   791                     break;
   792                 case 0x21: /* SHAR    Rn */
   793                     sh4r.t = RN(ir) & 0x00000001;
   794                     RN(ir) = ((int32_t)RN(ir)) >> 1;
   795                     break;
   796                 case 0x22: /* STS.L   PR, [--Rn] */
   797                     RN(ir) -= 4;
   798                     MEM_WRITE_LONG( RN(ir), sh4r.pr );
   799                     break;
   800                 case 0x23: /* STC.L   VBR, [--Rn] */
   801                     CHECKPRIV();
   802                     RN(ir) -= 4;
   803                     MEM_WRITE_LONG( RN(ir), sh4r.vbr );
   804                     break;
   805                 case 0x24: /* ROTCL   Rn */
   806                     tmp = RN(ir) >> 31;
   807                     RN(ir) <<= 1;
   808                     RN(ir) |= sh4r.t;
   809                     sh4r.t = tmp;
   810                     break;
   811                 case 0x25: /* ROTCR   Rn */
   812                     tmp = RN(ir) & 0x00000001;
   813                     RN(ir) >>= 1;
   814                     RN(ir) |= (sh4r.t << 31 );
   815                     sh4r.t = tmp;
   816                     break;
   817                 case 0x26: /* LDS.L   [Rn++], PR */
   818                     sh4r.pr = MEM_READ_LONG( RN(ir) );
   819                     RN(ir) += 4;
   820                     break;
   821                 case 0x27: /* LDC.L   [Rn++], VBR */
   822                     CHECKPRIV();
   823                     sh4r.vbr = MEM_READ_LONG(RN(ir));
   824                     RN(ir) +=4;
   825                     break;
   826                 case 0x28: /* SHLL16  Rn */
   827                     RN(ir) <<= 16;
   828                     break;
   829                 case 0x29: /* SHLR16  Rn */
   830                     RN(ir) >>= 16;
   831                     break;
   832                 case 0x2A: /* LDS     Rn, PR */
   833                     sh4r.pr = RN(ir);
   834                     break;
   835                 case 0x2B: /* JMP     [Rn] */
   836                     CHECKDEST( RN(ir) );
   837                     CHECKSLOTILLEGAL();
   838                     sh4r.in_delay_slot = 1;
   839                     sh4r.pc = sh4r.new_pc;
   840                     sh4r.new_pc = RN(ir);
   841                     return TRUE;
   842                 case 0x2E: /* LDC     Rn, VBR */
   843                     CHECKPRIV();
   844                     sh4r.vbr = RN(ir);
   845                     break;
   846                 case 0x32: /* STC.L   SGR, [--Rn] */
   847                     CHECKPRIV();
   848                     RN(ir) -= 4;
   849                     MEM_WRITE_LONG( RN(ir), sh4r.sgr );
   850                     break;
   851                 case 0x33: /* STC.L   SSR, [--Rn] */
   852                     CHECKPRIV();
   853                     RN(ir) -= 4;
   854                     MEM_WRITE_LONG( RN(ir), sh4r.ssr );
   855                     break;
   856                 case 0x37: /* LDC.L   [Rn++], SSR */
   857                     CHECKPRIV();
   858                     sh4r.ssr = MEM_READ_LONG(RN(ir));
   859                     RN(ir) +=4;
   860                     break;
   861                 case 0x3E: /* LDC     Rn, SSR */
   862                     CHECKPRIV();
   863                     sh4r.ssr = RN(ir);
   864                     break;
   865                 case 0x43: /* STC.L   SPC, [--Rn] */
   866                     CHECKPRIV();
   867                     RN(ir) -= 4;
   868                     MEM_WRITE_LONG( RN(ir), sh4r.spc );
   869                     break;
   870                 case 0x47: /* LDC.L   [Rn++], SPC */
   871                     CHECKPRIV();
   872                     sh4r.spc = MEM_READ_LONG(RN(ir));
   873                     RN(ir) +=4;
   874                     break;
   875                 case 0x4E: /* LDC     Rn, SPC */
   876                     CHECKPRIV();
   877                     sh4r.spc = RN(ir);
   878                     break;
   879                 case 0x52: /* STS.L   FPUL, [--Rn] */
   880                     RN(ir) -= 4;
   881                     MEM_WRITE_LONG( RN(ir), sh4r.fpul );
   882                     break;
   883                 case 0x56: /* LDS.L   [Rn++], FPUL */
   884                     sh4r.fpul = MEM_READ_LONG(RN(ir));
   885                     RN(ir) +=4;
   886                     break;
   887                 case 0x5A: /* LDS     Rn, FPUL */
   888                     sh4r.fpul = RN(ir);
   889                     break;
   890                 case 0x62: /* STS.L   FPSCR, [--Rn] */
   891                     RN(ir) -= 4;
   892                     MEM_WRITE_LONG( RN(ir), sh4r.fpscr );
   893                     break;
   894                 case 0x66: /* LDS.L   [Rn++], FPSCR */
   895                     sh4r.fpscr = MEM_READ_LONG(RN(ir));
   896                     RN(ir) +=4;
   897                     break;
   898                 case 0x6A: /* LDS     Rn, FPSCR */
   899                     sh4r.fpscr = RN(ir);
   900                     break;
   901                 case 0xF2: /* STC.L   DBR, [--Rn] */
   902                     CHECKPRIV();
   903                     RN(ir) -= 4;
   904                     MEM_WRITE_LONG( RN(ir), sh4r.dbr );
   905                     break;
   906                 case 0xF6: /* LDC.L   [Rn++], DBR */
   907                     CHECKPRIV();
   908                     sh4r.dbr = MEM_READ_LONG(RN(ir));
   909                     RN(ir) +=4;
   910                     break;
   911                 case 0xFA: /* LDC     Rn, DBR */
   912                     CHECKPRIV();
   913                     sh4r.dbr = RN(ir);
   914                     break;
   915                 case 0x83: case 0x93: case 0xA3: case 0xB3: case 0xC3:
   916                 case 0xD3: case 0xE3: case 0xF3: /* STC.L   Rn_BANK, [--Rn] */
   917                     CHECKPRIV();
   918                     RN(ir) -= 4;
   919                     MEM_WRITE_LONG( RN(ir), RN_BANK(ir) );
   920                     break;
   921                 case 0x87: case 0x97: case 0xA7: case 0xB7: case 0xC7:
   922                 case 0xD7: case 0xE7: case 0xF7: /* LDC.L   [Rn++], Rn_BANK */
   923                     CHECKPRIV();
   924                     RN_BANK(ir) = MEM_READ_LONG( RN(ir) );
   925                     RN(ir) += 4;
   926                     break;
   927                 case 0x8E: case 0x9E: case 0xAE: case 0xBE: case 0xCE:
   928                 case 0xDE: case 0xEE: case 0xFE: /* LDC     Rm, Rn_BANK */
   929                     CHECKPRIV();
   930                     RN_BANK(ir) = RM(ir);
   931                     break;
   932                 default:
   933                     if( (ir&0x000F) == 0x0F ) {
   934                         /* MAC.W   [Rm++], [Rn++] */
   935                         tmp = SIGNEXT16(MEM_READ_WORD(RM(ir))) *
   936                             SIGNEXT16(MEM_READ_WORD(RN(ir)));
   937                         if( sh4r.s ) {
   938                             /* FIXME */
   939                             UNIMP(ir);
   940                         } else sh4r.mac += SIGNEXT32(tmp);
   941                         RM(ir) += 2;
   942                         RN(ir) += 2;
   943                     } else if( (ir&0x000F) == 0x0C ) {
   944                         /* SHAD    Rm, Rn */
   945                         tmp = RM(ir);
   946                         if( (tmp & 0x80000000) == 0 ) RN(ir) <<= (tmp&0x1f);
   947                         else if( (tmp & 0x1F) == 0 )  
   948 			  RN(ir) = ((int32_t)RN(ir)) >> 31;
   949                         else 
   950 			  RN(ir) = ((int32_t)RN(ir)) >> (((~RM(ir)) & 0x1F)+1);
   951                     } else if( (ir&0x000F) == 0x0D ) {
   952                         /* SHLD    Rm, Rn */
   953                         tmp = RM(ir);
   954                         if( (tmp & 0x80000000) == 0 ) RN(ir) <<= (tmp&0x1f);
   955                         else if( (tmp & 0x1F) == 0 ) RN(ir) = 0;
   956                         else RN(ir) >>= (((~tmp) & 0x1F)+1);
   957                     } else UNDEF(ir);
   958             }
   959             break;
   960         case 5: /* 0101nnnnmmmmdddd */
   961             /* MOV.L   [Rm + disp4*4], Rn */
   962             RN(ir) = MEM_READ_LONG( RM(ir) + (DISP4(ir)<<2) );
   963             break;
   964         case 6: /* 0110xxxxxxxxxxxx */
   965             switch( ir&0x000f ) {
   966                 case 0: /* MOV.B   [Rm], Rn */
   967                     RN(ir) = MEM_READ_BYTE( RM(ir) );
   968                     break;
   969                 case 1: /* MOV.W   [Rm], Rn */
   970                     RN(ir) = MEM_READ_WORD( RM(ir) );
   971                     break;
   972                 case 2: /* MOV.L   [Rm], Rn */
   973                     RN(ir) = MEM_READ_LONG( RM(ir) );
   974                     break;
   975                 case 3: /* MOV     Rm, Rn */
   976                     RN(ir) = RM(ir);
   977                     break;
   978                 case 4: /* MOV.B   [Rm++], Rn */
   979                     RN(ir) = MEM_READ_BYTE( RM(ir) );
   980                     RM(ir) ++;
   981                     break;
   982                 case 5: /* MOV.W   [Rm++], Rn */
   983                     RN(ir) = MEM_READ_WORD( RM(ir) );
   984                     RM(ir) += 2;
   985                     break;
   986                 case 6: /* MOV.L   [Rm++], Rn */
   987                     RN(ir) = MEM_READ_LONG( RM(ir) );
   988                     RM(ir) += 4;
   989                     break;
   990                 case 7: /* NOT     Rm, Rn */
   991                     RN(ir) = ~RM(ir);
   992                     break;
   993                 case 8: /* SWAP.B  Rm, Rn */
   994                     RN(ir) = (RM(ir)&0xFFFF0000) | ((RM(ir)&0x0000FF00)>>8) |
   995                         ((RM(ir)&0x000000FF)<<8);
   996                     break;
   997                 case 9: /* SWAP.W  Rm, Rn */
   998                     RN(ir) = (RM(ir)>>16) | (RM(ir)<<16);
   999                     break;
  1000                 case 10:/* NEGC    Rm, Rn */
  1001                     tmp = 0 - RM(ir);
  1002                     RN(ir) = tmp - sh4r.t;
  1003                     sh4r.t = ( 0<tmp || tmp<RN(ir) ? 1 : 0 );
  1004                     break;
  1005                 case 11:/* NEG     Rm, Rn */
  1006                     RN(ir) = 0 - RM(ir);
  1007                     break;
  1008                 case 12:/* EXTU.B  Rm, Rn */
  1009                     RN(ir) = RM(ir)&0x000000FF;
  1010                     break;
  1011                 case 13:/* EXTU.W  Rm, Rn */
  1012                     RN(ir) = RM(ir)&0x0000FFFF;
  1013                     break;
  1014                 case 14:/* EXTS.B  Rm, Rn */
  1015                     RN(ir) = SIGNEXT8( RM(ir)&0x000000FF );
  1016                     break;
  1017                 case 15:/* EXTS.W  Rm, Rn */
  1018                     RN(ir) = SIGNEXT16( RM(ir)&0x0000FFFF );
  1019                     break;
  1021             break;
  1022         case 7: /* 0111nnnniiiiiiii */
  1023             /* ADD    imm8, Rn */
  1024             RN(ir) += IMM8(ir);
  1025             break;
  1026         case 8: /* 1000xxxxxxxxxxxx */
  1027             switch( (ir&0x0F00) >> 8 ) {
  1028                 case 0: /* MOV.B   R0, [Rm + disp4] */
  1029                     MEM_WRITE_BYTE( RM(ir) + DISP4(ir), R0 );
  1030                     break;
  1031                 case 1: /* MOV.W   R0, [Rm + disp4*2] */
  1032                     MEM_WRITE_WORD( RM(ir) + (DISP4(ir)<<1), R0 );
  1033                     break;
  1034                 case 4: /* MOV.B   [Rm + disp4], R0 */
  1035                     R0 = MEM_READ_BYTE( RM(ir) + DISP4(ir) );
  1036                     break;
  1037                 case 5: /* MOV.W   [Rm + disp4*2], R0 */
  1038                     R0 = MEM_READ_WORD( RM(ir) + (DISP4(ir)<<1) );
  1039                     break;
  1040                 case 8: /* CMP/EQ  imm, R0 */
  1041                     sh4r.t = ( R0 == IMM8(ir) ? 1 : 0 );
  1042                     break;
  1043                 case 9: /* BT      disp8 */
  1044                     CHECKSLOTILLEGAL()
  1045                     if( sh4r.t ) {
  1046                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )
  1047                         sh4r.pc += (PCDISP8(ir)<<1) + 4;
  1048                         sh4r.new_pc = sh4r.pc + 2;
  1049                         return TRUE;
  1051                     break;
  1052                 case 11:/* BF      disp8 */
  1053                     CHECKSLOTILLEGAL()
  1054                     if( !sh4r.t ) {
  1055                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )
  1056                         sh4r.pc += (PCDISP8(ir)<<1) + 4;
  1057                         sh4r.new_pc = sh4r.pc + 2;
  1058                         return TRUE;
  1060                     break;
  1061                 case 13:/* BT/S    disp8 */
  1062                     CHECKSLOTILLEGAL()
  1063                     if( sh4r.t ) {
  1064                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )
  1065                         sh4r.in_delay_slot = 1;
  1066                         sh4r.pc = sh4r.new_pc;
  1067                         sh4r.new_pc = pc + (PCDISP8(ir)<<1) + 4;
  1068                         sh4r.in_delay_slot = 1;
  1069                         return TRUE;
  1071                     break;
  1072                 case 15:/* BF/S    disp8 */
  1073                     CHECKSLOTILLEGAL()
  1074                     if( !sh4r.t ) {
  1075                         CHECKDEST( sh4r.pc + (PCDISP8(ir)<<1) + 4 )
  1076                         sh4r.in_delay_slot = 1;
  1077                         sh4r.pc = sh4r.new_pc;
  1078                         sh4r.new_pc = pc + (PCDISP8(ir)<<1) + 4;
  1079                         return TRUE;
  1081                     break;
  1082                 default: UNDEF(ir);
  1084             break;
  1085         case 9: /* 1001xxxxxxxxxxxx */
  1086             /* MOV.W   [disp8*2 + pc + 4], Rn */
  1087             RN(ir) = MEM_READ_WORD( pc + 4 + (DISP8(ir)<<1) );
  1088             break;
  1089         case 10:/* 1010dddddddddddd */
  1090             /* BRA     disp12 */
  1091             CHECKDEST( sh4r.pc + (DISP12(ir)<<1) + 4 )
  1092             CHECKSLOTILLEGAL()
  1093             sh4r.in_delay_slot = 1;
  1094             sh4r.pc = sh4r.new_pc;
  1095             sh4r.new_pc = pc + 4 + (DISP12(ir)<<1);
  1096             return TRUE;
  1097         case 11:/* 1011dddddddddddd */
  1098             /* BSR     disp12 */
  1099             CHECKDEST( sh4r.pc + (DISP12(ir)<<1) + 4 )
  1100             CHECKSLOTILLEGAL()
  1101             sh4r.in_delay_slot = 1;
  1102             sh4r.pr = pc + 4;
  1103             sh4r.pc = sh4r.new_pc;
  1104             sh4r.new_pc = pc + 4 + (DISP12(ir)<<1);
  1105             return TRUE;
  1106         case 12:/* 1100xxxxdddddddd */
  1107         switch( (ir&0x0F00)>>8 ) {
  1108                 case 0: /* MOV.B  R0, [GBR + disp8] */
  1109                     MEM_WRITE_BYTE( sh4r.gbr + DISP8(ir), R0 );
  1110                     break;
  1111                 case 1: /* MOV.W  R0, [GBR + disp8*2] */
  1112                     MEM_WRITE_WORD( sh4r.gbr + (DISP8(ir)<<1), R0 );
  1113                     break;
  1114                 case  2: /*MOV.L   R0, [GBR + disp8*4] */
  1115                     MEM_WRITE_LONG( sh4r.gbr + (DISP8(ir)<<2), R0 );
  1116                     break;
  1117                 case 3: /* TRAPA   imm8 */
  1118                     CHECKSLOTILLEGAL()
  1119                     sh4r.in_delay_slot = 1;
  1120                     MMIO_WRITE( MMU, TRA, UIMM8(ir) );
  1121                     sh4r.pc = sh4r.new_pc;  /* RAISE ends the instruction */
  1122                     sh4r.new_pc += 2;
  1123                     RAISE( EXC_TRAP, EXV_TRAP );
  1124                     break;
  1125                 case 4: /* MOV.B   [GBR + disp8], R0 */
  1126                     R0 = MEM_READ_BYTE( sh4r.gbr + DISP8(ir) );
  1127                     break;
  1128                 case 5: /* MOV.W   [GBR + disp8*2], R0 */
  1129                     R0 = MEM_READ_WORD( sh4r.gbr + (DISP8(ir)<<1) );
  1130                     break;
  1131                 case 6: /* MOV.L   [GBR + disp8*4], R0 */
  1132                     R0 = MEM_READ_LONG( sh4r.gbr + (DISP8(ir)<<2) );
  1133                     break;
  1134                 case 7: /* MOVA    disp8 + pc&~3 + 4, R0 */
  1135                     R0 = (pc&0xFFFFFFFC) + (DISP8(ir)<<2) + 4;
  1136                     break;
  1137                 case 8: /* TST     imm8, R0 */
  1138                     sh4r.t = (R0 & UIMM8(ir) ? 0 : 1);
  1139                     break;
  1140                 case 9: /* AND     imm8, R0 */
  1141                     R0 &= UIMM8(ir);
  1142                     break;
  1143                 case 10:/* XOR     imm8, R0 */
  1144                     R0 ^= UIMM8(ir);
  1145                     break;
  1146                 case 11:/* OR      imm8, R0 */
  1147                     R0 |= UIMM8(ir);
  1148                     break;
  1149                 case 12:/* TST.B   imm8, [R0+GBR] */
  1150                     sh4r.t = ( MEM_READ_BYTE(R0 + sh4r.gbr) & UIMM8(ir) ? 0 : 1 );
  1151                     break;
  1152                 case 13:/* AND.B   imm8, [R0+GBR] */
  1153                     MEM_WRITE_BYTE( R0 + sh4r.gbr,
  1154                                     UIMM8(ir) & MEM_READ_BYTE(R0 + sh4r.gbr) );
  1155                     break;
  1156                 case 14:/* XOR.B   imm8, [R0+GBR] */
  1157                     MEM_WRITE_BYTE( R0 + sh4r.gbr,
  1158                                     UIMM8(ir) ^ MEM_READ_BYTE(R0 + sh4r.gbr) );
  1159                     break;
  1160                 case 15:/* OR.B    imm8, [R0+GBR] */
  1161                     MEM_WRITE_BYTE( R0 + sh4r.gbr,
  1162                                     UIMM8(ir) | MEM_READ_BYTE(R0 + sh4r.gbr) );
  1163                     break;
  1165             break;
  1166         case 13:/* 1101nnnndddddddd */
  1167             /* MOV.L   [disp8*4 + pc&~3 + 4], Rn */
  1168             RN(ir) = MEM_READ_LONG( (pc&0xFFFFFFFC) + (DISP8(ir)<<2) + 4 );
  1169             break;
  1170         case 14:/* 1110nnnniiiiiiii */
  1171             /* MOV     imm8, Rn */
  1172             RN(ir) = IMM8(ir);
  1173             break;
  1174         case 15:/* 1111xxxxxxxxxxxx */
  1175             CHECKFPUEN();
  1176 	    if( IS_FPU_DOUBLEPREC() ) {
  1177 		switch( ir&0x000F ) {
  1178                 case 0: /* FADD    FRm, FRn */
  1179                     DRN(ir) += DRM(ir);
  1180                     break;
  1181                 case 1: /* FSUB    FRm, FRn */
  1182                     DRN(ir) -= DRM(ir);
  1183                     break;
  1184                 case 2: /* FMUL    FRm, FRn */
  1185                     DRN(ir) = DRN(ir) * DRM(ir);
  1186                     break;
  1187                 case 3: /* FDIV    FRm, FRn */
  1188                     DRN(ir) = DRN(ir) / DRM(ir);
  1189                     break;
  1190                 case 4: /* FCMP/EQ FRm, FRn */
  1191                     sh4r.t = ( DRN(ir) == DRM(ir) ? 1 : 0 );
  1192                     break;
  1193                 case 5: /* FCMP/GT FRm, FRn */
  1194                     sh4r.t = ( DRN(ir) > DRM(ir) ? 1 : 0 );
  1195                     break;
  1196                 case 6: /* FMOV.S  [Rm+R0], FRn */
  1197                     MEM_FP_READ( RM(ir) + R0, FRNn(ir) );
  1198                     break;
  1199                 case 7: /* FMOV.S  FRm, [Rn+R0] */
  1200                     MEM_FP_WRITE( RN(ir) + R0, FRMn(ir) );
  1201                     break;
  1202                 case 8: /* FMOV.S  [Rm], FRn */
  1203                     MEM_FP_READ( RM(ir), FRNn(ir) );
  1204                     break;
  1205                 case 9: /* FMOV.S  [Rm++], FRn */
  1206                     MEM_FP_READ( RM(ir), FRNn(ir) );
  1207                     RM(ir) += FP_WIDTH;
  1208                     break;
  1209                 case 10:/* FMOV.S  FRm, [Rn] */
  1210                     MEM_FP_WRITE( RN(ir), FRMn(ir) );
  1211                     break;
  1212                 case 11:/* FMOV.S  FRm, [--Rn] */
  1213                     RN(ir) -= FP_WIDTH;
  1214                     MEM_FP_WRITE( RN(ir), FRMn(ir) );
  1215                     break;
  1216                 case 12:/* FMOV    FRm, FRn */
  1217 		    if( IS_FPU_DOUBLESIZE() )
  1218 			DRN(ir) = DRM(ir);
  1219 		    else
  1220 			FRN(ir) = FRM(ir);
  1221                     break;
  1222                 case 13:
  1223                     switch( (ir&0x00F0) >> 4 ) {
  1224 		    case 0: /* FSTS    FPUL, FRn */
  1225 			FRN(ir) = FPULf;
  1226 			break;
  1227 		    case 1: /* FLDS    FRn,FPUL */
  1228 			FPULf = FRN(ir);
  1229 			break;
  1230 		    case 2: /* FLOAT   FPUL, FRn */
  1231 			DRN(ir) = (float)FPULi;
  1232 			break;
  1233 		    case 3: /* FTRC    FRn, FPUL */
  1234 			FPULi = (uint32_t)DRN(ir);
  1235 			/* FIXME: is this sufficient? */
  1236 			break;
  1237 		    case 4: /* FNEG    FRn */
  1238 			DRN(ir) = -DRN(ir);
  1239 			break;
  1240 		    case 5: /* FABS    FRn */
  1241 			DRN(ir) = fabs(DRN(ir));
  1242 			break;
  1243 		    case 6: /* FSQRT   FRn */
  1244 			DRN(ir) = sqrt(DRN(ir));
  1245 			break;
  1246 		    case 7: /* FSRRA FRn */
  1247 			DRN(ir) = 1.0/sqrt(DRN(ir));
  1248 			break;
  1249 		    case 8: /* FLDI0   FRn */
  1250 			DRN(ir) = 0.0;
  1251 			break;
  1252 		    case 9: /* FLDI1   FRn */
  1253 			DRN(ir) = 1.0;
  1254 			break;
  1255 		    case 10: /* FCNVSD FPUL, DRn */
  1256 			DRN(ir) = (double)FPULf;
  1257 			break;
  1258 		    case 11: /* FCNVDS DRn, FPUL */
  1259 			FPULf = (float)DRN(ir);
  1260 			break;
  1261 		    case 14:/* FIPR    FVm, FVn */
  1262 			UNDEF(ir);
  1263 			break;
  1264 		    case 15:
  1265 			if( (ir&0x0300) == 0x0100 ) { /* FTRV    XMTRX,FVn */
  1266 			    break;
  1268 			else if( (ir&0x0100) == 0 ) { /* FSCA    FPUL, DRn */
  1269 			    float angle = (((float)(short)(FPULi>>16)) +
  1270 					   ((float)(FPULi&16)/65536.0)) *
  1271 				2 * M_PI;
  1272 			    int reg = DRNn(ir);
  1273 			    DR(reg) = sinf(angle);
  1274 			    DR(reg+1) = cosf(angle);
  1275 			    break;
  1277 			else if( ir == 0xFBFD ) {
  1278 			    /* FRCHG   */
  1279 			    sh4r.fpscr ^= FPSCR_FR;
  1280 			    break;
  1282 			else if( ir == 0xF3FD ) {
  1283 			    /* FSCHG   */
  1284 			    sh4r.fpscr ^= FPSCR_SZ;
  1285 			    break;
  1287 		    default: UNDEF(ir);
  1289                     break;
  1290                 case 14:/* FMAC    FR0, FRm, FRn */
  1291                     DRN(ir) += DRM(ir)*DR0;
  1292                     break;
  1293                 default: UNDEF(ir);
  1295 	    } else {
  1296 		switch( ir&0x000F ) {
  1297                 case 0: /* FADD    FRm, FRn */
  1298                     FRN(ir) += FRM(ir);
  1299                     break;
  1300                 case 1: /* FSUB    FRm, FRn */
  1301                     FRN(ir) -= FRM(ir);
  1302                     break;
  1303                 case 2: /* FMUL    FRm, FRn */
  1304                     FRN(ir) = FRN(ir) * FRM(ir);
  1305                     break;
  1306                 case 3: /* FDIV    FRm, FRn */
  1307                     FRN(ir) = FRN(ir) / FRM(ir);
  1308                     break;
  1309                 case 4: /* FCMP/EQ FRm, FRn */
  1310                     sh4r.t = ( FRN(ir) == FRM(ir) ? 1 : 0 );
  1311                     break;
  1312                 case 5: /* FCMP/GT FRm, FRn */
  1313                     sh4r.t = ( FRN(ir) > FRM(ir) ? 1 : 0 );
  1314                     break;
  1315                 case 6: /* FMOV.S  [Rm+R0], FRn */
  1316                     MEM_FP_READ( RM(ir) + R0, FRNn(ir) );
  1317                     break;
  1318                 case 7: /* FMOV.S  FRm, [Rn+R0] */
  1319                     MEM_FP_WRITE( RN(ir) + R0, FRMn(ir) );
  1320                     break;
  1321                 case 8: /* FMOV.S  [Rm], FRn */
  1322                     MEM_FP_READ( RM(ir), FRNn(ir) );
  1323                     break;
  1324                 case 9: /* FMOV.S  [Rm++], FRn */
  1325                     MEM_FP_READ( RM(ir), FRNn(ir) );
  1326                     RM(ir) += FP_WIDTH;
  1327                     break;
  1328                 case 10:/* FMOV.S  FRm, [Rn] */
  1329                     MEM_FP_WRITE( RN(ir), FRMn(ir) );
  1330                     break;
  1331                 case 11:/* FMOV.S  FRm, [--Rn] */
  1332                     RN(ir) -= FP_WIDTH;
  1333                     MEM_FP_WRITE( RN(ir), FRMn(ir) );
  1334                     break;
  1335                 case 12:/* FMOV    FRm, FRn */
  1336 		    if( IS_FPU_DOUBLESIZE() )
  1337 			DRN(ir) = DRM(ir);
  1338 		    else
  1339 			FRN(ir) = FRM(ir);
  1340                     break;
  1341                 case 13:
  1342                     switch( (ir&0x00F0) >> 4 ) {
  1343 		    case 0: /* FSTS    FPUL, FRn */
  1344 			FRN(ir) = FPULf;
  1345 			break;
  1346 		    case 1: /* FLDS    FRn,FPUL */
  1347 			FPULf = FRN(ir);
  1348 			break;
  1349 		    case 2: /* FLOAT   FPUL, FRn */
  1350 			FRN(ir) = (float)FPULi;
  1351 			break;
  1352 		    case 3: /* FTRC    FRn, FPUL */
  1353 			FPULi = (uint32_t)FRN(ir);
  1354 			/* FIXME: is this sufficient? */
  1355 			break;
  1356 		    case 4: /* FNEG    FRn */
  1357 			FRN(ir) = -FRN(ir);
  1358 			break;
  1359 		    case 5: /* FABS    FRn */
  1360 			FRN(ir) = fabsf(FRN(ir));
  1361 			break;
  1362 		    case 6: /* FSQRT   FRn */
  1363 			FRN(ir) = sqrtf(FRN(ir));
  1364 			break;
  1365 		    case 7: /* FSRRA FRn */
  1366 			FRN(ir) = 1.0/sqrtf(FRN(ir));
  1367 			break;
  1368 		    case 8: /* FLDI0   FRn */
  1369 			FRN(ir) = 0.0;
  1370 			break;
  1371 		    case 9: /* FLDI1   FRn */
  1372 			FRN(ir) = 1.0;
  1373 			break;
  1374 		    case 10: /* FCNVSD FPUL, DRn */
  1375 			UNDEF(ir);
  1376 			break;
  1377 		    case 11: /* FCNVDS DRn, FPUL */
  1378 			UNDEF(ir);
  1379 			break;
  1380 		    case 14:/* FIPR    FVm, FVn */
  1381                             /* FIXME: This is not going to be entirely accurate
  1382                              * as the SH4 instruction is less precise. Also
  1383                              * need to check for 0s and infinities.
  1384                              */
  1386                             int tmp2 = FVN(ir);
  1387                             tmp = FVM(ir);
  1388                             FR(tmp2+3) = FR(tmp)*FR(tmp2) +
  1389                                 FR(tmp+1)*FR(tmp2+1) +
  1390                                 FR(tmp+2)*FR(tmp2+2) +
  1391                                 FR(tmp+3)*FR(tmp2+3);
  1392                             break;
  1394 		    case 15:
  1395 			if( (ir&0x0300) == 0x0100 ) { /* FTRV    XMTRX,FVn */
  1396 			    tmp = FVN(ir);
  1397 			    float fv[4] = { FR(tmp), FR(tmp+1), FR(tmp+2), FR(tmp+3) };
  1398 			    FR(tmp) = XF(0) * fv[0] + XF(4)*fv[1] +
  1399 				XF(8)*fv[2] + XF(12)*fv[3];
  1400 			    FR(tmp+1) = XF(1) * fv[0] + XF(5)*fv[1] +
  1401 				XF(9)*fv[2] + XF(13)*fv[3];
  1402 			    FR(tmp+2) = XF(2) * fv[0] + XF(6)*fv[1] +
  1403 				XF(10)*fv[2] + XF(14)*fv[3];
  1404 			    FR(tmp+3) = XF(3) * fv[0] + XF(7)*fv[1] +
  1405 				XF(11)*fv[2] + XF(15)*fv[3];
  1406 			    break;
  1408 			else if( (ir&0x0100) == 0 ) { /* FSCA    FPUL, DRn */
  1409 			    float angle = (((float)(short)(FPULi>>16)) +
  1410 					   ((float)(FPULi&16)/65536.0)) *
  1411 				2 * M_PI;
  1412 			    int reg = FRNn(ir);
  1413 			    FR(reg) = sinf(angle);
  1414 			    FR(reg+1) = cosf(angle);
  1415 			    break;
  1417 			else if( ir == 0xFBFD ) {
  1418 			    /* FRCHG   */
  1419 			    sh4r.fpscr ^= FPSCR_FR;
  1420 			    break;
  1422 			else if( ir == 0xF3FD ) {
  1423 			    /* FSCHG   */
  1424 			    sh4r.fpscr ^= FPSCR_SZ;
  1425 			    break;
  1427 		    default: UNDEF(ir);
  1429                     break;
  1430                 case 14:/* FMAC    FR0, FRm, FRn */
  1431                     FRN(ir) += FRM(ir)*FR0;
  1432                     break;
  1433                 default: UNDEF(ir);
  1436 	    break;
  1438     sh4r.pc = sh4r.new_pc;
  1439     sh4r.new_pc += 2;
  1440     sh4r.in_delay_slot = 0;
.