forked from kstenerud/Musashi
-
Notifications
You must be signed in to change notification settings - Fork 0
/
m68kcpu.h
2159 lines (1788 loc) · 66.7 KB
/
m68kcpu.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* ======================================================================== */
/* ========================= LICENSING & COPYRIGHT ======================== */
/* ======================================================================== */
/*
* MUSASHI
* Version 4.5
*
* A portable Motorola M680x0 processor emulation engine.
* Copyright Karl Stenerud. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef M68KCPU__HEADER
#define M68KCPU__HEADER
#ifdef __cplusplus
extern "C" {
#endif
#include "m68k.h"
#include <limits.h>
#include <setjmp.h>
/* ======================================================================== */
/* ==================== ARCHITECTURE-DEPENDANT DEFINES ==================== */
/* ======================================================================== */
/* Check for > 32bit sizes */
#if UINT_MAX > 0xffffffff
#define M68K_INT_GT_32_BIT 1
#else
#define M68K_INT_GT_32_BIT 0
#endif
/* Data types used in this emulation core */
#undef sint8
#undef sint16
#undef sint32
#undef sint64
#undef uint8
#undef uint16
#undef uint32
#undef uint64
#undef sint
#undef uint
typedef signed char sint8; /* ASG: changed from char to signed char */
typedef signed short sint16;
typedef signed int sint32; /* AWJ: changed from long to int */
typedef unsigned char uint8;
typedef unsigned short uint16;
typedef unsigned int uint32; /* AWJ: changed from long to int */
/* signed and unsigned int must be at least 32 bits wide */
typedef signed int sint;
typedef unsigned int uint;
#if M68K_USE_64_BIT
typedef signed long long sint64;
typedef unsigned long long uint64;
#else
typedef sint32 sint64;
typedef uint32 uint64;
#endif /* M68K_USE_64_BIT */
/* U64 and S64 are used to wrap long integer constants. */
#ifdef __GNUC__
#define U64(val) val##ULL
#define S64(val) val##LL
#else
#define U64(val) val
#define S64(val) val
#endif
#include "softfloat/milieu.h"
#include "softfloat/softfloat.h"
/* Allow for architectures that don't have 8-bit sizes */
#if UCHAR_MAX == 0xff
#define MAKE_INT_8(A) (sint8)(A)
#else
#undef sint8
#define sint8 signed int
#undef uint8
#define uint8 unsigned int
static inline sint MAKE_INT_8(uint value)
{
return (value & 0x80) ? value | ~0xff : value & 0xff;
}
#endif /* UCHAR_MAX == 0xff */
/* Allow for architectures that don't have 16-bit sizes */
#if USHRT_MAX == 0xffff
#define MAKE_INT_16(A) (sint16)(A)
#else
#undef sint16
#define sint16 signed int
#undef uint16
#define uint16 unsigned int
static inline sint MAKE_INT_16(uint value)
{
return (value & 0x8000) ? value | ~0xffff : value & 0xffff;
}
#endif /* USHRT_MAX == 0xffff */
/* Allow for architectures that don't have 32-bit sizes */
#if UINT_MAX == 0xffffffff
#define MAKE_INT_32(A) (sint32)(A)
#else
#undef sint32
#define sint32 signed int
#undef uint32
#define uint32 unsigned int
static inline sint MAKE_INT_32(uint value)
{
return (value & 0x80000000) ? value | ~0xffffffff : value & 0xffffffff;
}
#endif /* UINT_MAX == 0xffffffff */
/* ======================================================================== */
/* ============================ GENERAL DEFINES =========================== */
/* ======================================================================== */
/* Exception Vectors handled by emulation */
#define EXCEPTION_RESET 0
#define EXCEPTION_BUS_ERROR 2 /* This one is not emulated! */
#define EXCEPTION_ADDRESS_ERROR 3 /* This one is partially emulated (doesn't stack a proper frame yet) */
#define EXCEPTION_ILLEGAL_INSTRUCTION 4
#define EXCEPTION_ZERO_DIVIDE 5
#define EXCEPTION_CHK 6
#define EXCEPTION_TRAPV 7
#define EXCEPTION_PRIVILEGE_VIOLATION 8
#define EXCEPTION_TRACE 9
#define EXCEPTION_1010 10
#define EXCEPTION_1111 11
#define EXCEPTION_FORMAT_ERROR 14
#define EXCEPTION_UNINITIALIZED_INTERRUPT 15
#define EXCEPTION_SPURIOUS_INTERRUPT 24
#define EXCEPTION_INTERRUPT_AUTOVECTOR 24
#define EXCEPTION_TRAP_BASE 32
/* Function codes set by CPU during data/address bus activity */
#define FUNCTION_CODE_USER_DATA 1
#define FUNCTION_CODE_USER_PROGRAM 2
#define FUNCTION_CODE_SUPERVISOR_DATA 5
#define FUNCTION_CODE_SUPERVISOR_PROGRAM 6
#define FUNCTION_CODE_CPU_SPACE 7
/* CPU types for deciding what to emulate */
#define CPU_TYPE_000 (0x00000001)
#define CPU_TYPE_008 (0x00000002)
#define CPU_TYPE_010 (0x00000004)
#define CPU_TYPE_EC020 (0x00000008)
#define CPU_TYPE_020 (0x00000010)
#define CPU_TYPE_EC030 (0x00000020)
#define CPU_TYPE_030 (0x00000040)
#define CPU_TYPE_EC040 (0x00000080)
#define CPU_TYPE_LC040 (0x00000100)
#define CPU_TYPE_040 (0x00000200)
#define CPU_TYPE_SCC070 (0x00000400)
/* Different ways to stop the CPU */
#define STOP_LEVEL_STOP 1
#define STOP_LEVEL_HALT 2
/* Used for 68000 address error processing */
#define INSTRUCTION_YES 0
#define INSTRUCTION_NO 0x08
#define MODE_READ 0x10
#define MODE_WRITE 0
#define RUN_MODE_NORMAL 0
#define RUN_MODE_BERR_AERR_RESET_WSF 1 /* writing stack frame */
#define RUN_MODE_BERR_AERR_RESET 2 /* stack frame done */
#ifndef NULL
#define NULL ((void*)0)
#endif
/* ======================================================================== */
/* ================================ MACROS ================================ */
/* ======================================================================== */
/* ---------------------------- General Macros ---------------------------- */
/* Bit Isolation Macros */
#define BIT_0(A) ((A) & 0x00000001)
#define BIT_1(A) ((A) & 0x00000002)
#define BIT_2(A) ((A) & 0x00000004)
#define BIT_3(A) ((A) & 0x00000008)
#define BIT_4(A) ((A) & 0x00000010)
#define BIT_5(A) ((A) & 0x00000020)
#define BIT_6(A) ((A) & 0x00000040)
#define BIT_7(A) ((A) & 0x00000080)
#define BIT_8(A) ((A) & 0x00000100)
#define BIT_9(A) ((A) & 0x00000200)
#define BIT_A(A) ((A) & 0x00000400)
#define BIT_B(A) ((A) & 0x00000800)
#define BIT_C(A) ((A) & 0x00001000)
#define BIT_D(A) ((A) & 0x00002000)
#define BIT_E(A) ((A) & 0x00004000)
#define BIT_F(A) ((A) & 0x00008000)
#define BIT_10(A) ((A) & 0x00010000)
#define BIT_11(A) ((A) & 0x00020000)
#define BIT_12(A) ((A) & 0x00040000)
#define BIT_13(A) ((A) & 0x00080000)
#define BIT_14(A) ((A) & 0x00100000)
#define BIT_15(A) ((A) & 0x00200000)
#define BIT_16(A) ((A) & 0x00400000)
#define BIT_17(A) ((A) & 0x00800000)
#define BIT_18(A) ((A) & 0x01000000)
#define BIT_19(A) ((A) & 0x02000000)
#define BIT_1A(A) ((A) & 0x04000000)
#define BIT_1B(A) ((A) & 0x08000000)
#define BIT_1C(A) ((A) & 0x10000000)
#define BIT_1D(A) ((A) & 0x20000000)
#define BIT_1E(A) ((A) & 0x40000000)
#define BIT_1F(A) ((A) & 0x80000000)
/* Get the most significant bit for specific sizes */
#define GET_MSB_8(A) ((A) & 0x80)
#define GET_MSB_9(A) ((A) & 0x100)
#define GET_MSB_16(A) ((A) & 0x8000)
#define GET_MSB_17(A) ((A) & 0x10000)
#define GET_MSB_32(A) ((A) & 0x80000000)
#if M68K_USE_64_BIT
#define GET_MSB_33(A) ((A) & 0x100000000)
#endif /* M68K_USE_64_BIT */
/* Isolate nibbles */
#define LOW_NIBBLE(A) ((A) & 0x0f)
#define HIGH_NIBBLE(A) ((A) & 0xf0)
/* These are used to isolate 8, 16, and 32 bit sizes */
#define MASK_OUT_ABOVE_2(A) ((A) & 3)
#define MASK_OUT_ABOVE_8(A) ((A) & 0xff)
#define MASK_OUT_ABOVE_16(A) ((A) & 0xffff)
#define MASK_OUT_BELOW_2(A) ((A) & ~3)
#define MASK_OUT_BELOW_8(A) ((A) & ~0xff)
#define MASK_OUT_BELOW_16(A) ((A) & ~0xffff)
/* No need to mask if we are 32 bit */
#if M68K_INT_GT_32_BIT || M68K_USE_64_BIT
#define MASK_OUT_ABOVE_32(A) ((A) & 0xffffffff)
#define MASK_OUT_BELOW_32(A) ((A) & ~0xffffffff)
#else
#define MASK_OUT_ABOVE_32(A) (A)
#define MASK_OUT_BELOW_32(A) 0
#endif /* M68K_INT_GT_32_BIT || M68K_USE_64_BIT */
/* Simulate address lines of 68k family */
#define ADDRESS_68K(A) ((A)&CPU_ADDRESS_MASK)
/* Shift & Rotate Macros. */
#define LSL(A, C) ((A) << (C))
#define LSR(A, C) ((A) >> (C))
/* Some > 32-bit optimizations */
#if M68K_INT_GT_32_BIT
/* Shift left and right */
#define LSR_32(A, C) ((A) >> (C))
#define LSL_32(A, C) ((A) << (C))
#else
/* We have to do this because the morons at ANSI decided that shifts
* by >= data size are undefined.
*/
#define LSR_32(A, C) ((C) < 32 ? (A) >> (C) : 0)
#define LSL_32(A, C) ((C) < 32 ? (A) << (C) : 0)
#endif /* M68K_INT_GT_32_BIT */
#if M68K_USE_64_BIT
#define LSL_32_64(A, C) ((A) << (C))
#define LSR_32_64(A, C) ((A) >> (C))
#define ROL_33_64(A, C) (LSL_32_64(A, C) | LSR_32_64(A, 33-(C)))
#define ROR_33_64(A, C) (LSR_32_64(A, C) | LSL_32_64(A, 33-(C)))
#endif /* M68K_USE_64_BIT */
#define ROL_8(A, C) MASK_OUT_ABOVE_8(LSL(A, C) | LSR(A, 8-(C)))
#define ROL_9(A, C) (LSL(A, C) | LSR(A, 9-(C)))
#define ROL_16(A, C) MASK_OUT_ABOVE_16(LSL(A, C) | LSR(A, 16-(C)))
#define ROL_17(A, C) (LSL(A, C) | LSR(A, 17-(C)))
#define ROL_32(A, C) MASK_OUT_ABOVE_32(LSL_32(A, C) | LSR_32(A, 32-(C)))
#define ROL_33(A, C) (LSL_32(A, C) | LSR_32(A, 33-(C)))
#define ROR_8(A, C) MASK_OUT_ABOVE_8(LSR(A, C) | LSL(A, 8-(C)))
#define ROR_9(A, C) (LSR(A, C) | LSL(A, 9-(C)))
#define ROR_16(A, C) MASK_OUT_ABOVE_16(LSR(A, C) | LSL(A, 16-(C)))
#define ROR_17(A, C) (LSR(A, C) | LSL(A, 17-(C)))
#define ROR_32(A, C) MASK_OUT_ABOVE_32(LSR_32(A, C) | LSL_32(A, 32-(C)))
#define ROR_33(A, C) (LSR_32(A, C) | LSL_32(A, 33-(C)))
/* ------------------------------ CPU Access ------------------------------ */
/* Access the CPU registers */
#define CPU_TYPE m68ki_cpu.cpu_type
#define REG_DA m68ki_cpu.dar /* easy access to data and address regs */
#define REG_DA_SAVE m68ki_cpu.dar_save
#define REG_D m68ki_cpu.dar
#define REG_A (m68ki_cpu.dar+8)
#define REG_PPC m68ki_cpu.ppc
#define REG_PC m68ki_cpu.pc
#define REG_SP_BASE m68ki_cpu.sp
#define REG_USP m68ki_cpu.sp[0]
#define REG_ISP m68ki_cpu.sp[4]
#define REG_MSP m68ki_cpu.sp[6]
#define REG_SP m68ki_cpu.dar[15]
#define REG_VBR m68ki_cpu.vbr
#define REG_SFC m68ki_cpu.sfc
#define REG_DFC m68ki_cpu.dfc
#define REG_CACR m68ki_cpu.cacr
#define REG_CAAR m68ki_cpu.caar
#define REG_IR m68ki_cpu.ir
#define REG_FP m68ki_cpu.fpr
#define REG_FPCR m68ki_cpu.fpcr
#define REG_FPSR m68ki_cpu.fpsr
#define REG_FPIAR m68ki_cpu.fpiar
#define FLAG_T1 m68ki_cpu.t1_flag
#define FLAG_T0 m68ki_cpu.t0_flag
#define FLAG_S m68ki_cpu.s_flag
#define FLAG_M m68ki_cpu.m_flag
#define FLAG_X m68ki_cpu.x_flag
#define FLAG_N m68ki_cpu.n_flag
#define FLAG_Z m68ki_cpu.not_z_flag
#define FLAG_V m68ki_cpu.v_flag
#define FLAG_C m68ki_cpu.c_flag
#define FLAG_INT_MASK m68ki_cpu.int_mask
#define CPU_INT_LEVEL m68ki_cpu.int_level /* ASG: changed from CPU_INTS_PENDING */
#define CPU_STOPPED m68ki_cpu.stopped
#define CPU_PREF_ADDR m68ki_cpu.pref_addr
#define CPU_PREF_DATA m68ki_cpu.pref_data
#define CPU_ADDRESS_MASK m68ki_cpu.address_mask
#define CPU_SR_MASK m68ki_cpu.sr_mask
#define CPU_INSTR_MODE m68ki_cpu.instr_mode
#define CPU_RUN_MODE m68ki_cpu.run_mode
#define CYC_INSTRUCTION m68ki_cpu.cyc_instruction
#define CYC_EXCEPTION m68ki_cpu.cyc_exception
#define CYC_BCC_NOTAKE_B m68ki_cpu.cyc_bcc_notake_b
#define CYC_BCC_NOTAKE_W m68ki_cpu.cyc_bcc_notake_w
#define CYC_DBCC_F_NOEXP m68ki_cpu.cyc_dbcc_f_noexp
#define CYC_DBCC_F_EXP m68ki_cpu.cyc_dbcc_f_exp
#define CYC_SCC_R_TRUE m68ki_cpu.cyc_scc_r_true
#define CYC_MOVEM_W m68ki_cpu.cyc_movem_w
#define CYC_MOVEM_L m68ki_cpu.cyc_movem_l
#define CYC_SHIFT m68ki_cpu.cyc_shift
#define CYC_RESET m68ki_cpu.cyc_reset
#define HAS_PMMU m68ki_cpu.has_pmmu
#define PMMU_ENABLED m68ki_cpu.pmmu_enabled
#define RESET_CYCLES m68ki_cpu.reset_cycles
#define CALLBACK_INT_ACK m68ki_cpu.int_ack_callback
#define CALLBACK_BKPT_ACK m68ki_cpu.bkpt_ack_callback
#define CALLBACK_RESET_INSTR m68ki_cpu.reset_instr_callback
#define CALLBACK_CMPILD_INSTR m68ki_cpu.cmpild_instr_callback
#define CALLBACK_RTE_INSTR m68ki_cpu.rte_instr_callback
#define CALLBACK_TAS_INSTR m68ki_cpu.tas_instr_callback
#define CALLBACK_ILLG_INSTR m68ki_cpu.illg_instr_callback
#define CALLBACK_PC_CHANGED m68ki_cpu.pc_changed_callback
#define CALLBACK_SET_FC m68ki_cpu.set_fc_callback
#define CALLBACK_INSTR_HOOK m68ki_cpu.instr_hook_callback
/* ----------------------------- Configuration ---------------------------- */
/* These defines are dependant on the configuration defines in m68kconf.h */
/* Disable certain comparisons if we're not using all CPU types */
#if M68K_EMULATE_040
#define CPU_TYPE_IS_040_PLUS(A) ((A) & (CPU_TYPE_040 | CPU_TYPE_EC040))
#define CPU_TYPE_IS_040_LESS(A) 1
#else
#define CPU_TYPE_IS_040_PLUS(A) 0
#define CPU_TYPE_IS_040_LESS(A) 1
#endif
#if M68K_EMULATE_030
#define CPU_TYPE_IS_030_PLUS(A) ((A) & (CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
#define CPU_TYPE_IS_030_LESS(A) 1
#else
#define CPU_TYPE_IS_030_PLUS(A) 0
#define CPU_TYPE_IS_030_LESS(A) 1
#endif
#if M68K_EMULATE_020
#define CPU_TYPE_IS_020_PLUS(A) ((A) & (CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
#define CPU_TYPE_IS_020_LESS(A) 1
#else
#define CPU_TYPE_IS_020_PLUS(A) 0
#define CPU_TYPE_IS_020_LESS(A) 1
#endif
#if M68K_EMULATE_EC020
#define CPU_TYPE_IS_EC020_PLUS(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_030 | CPU_TYPE_EC030 | CPU_TYPE_040 | CPU_TYPE_EC040))
#define CPU_TYPE_IS_EC020_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_010 | CPU_TYPE_EC020))
#else
#define CPU_TYPE_IS_EC020_PLUS(A) CPU_TYPE_IS_020_PLUS(A)
#define CPU_TYPE_IS_EC020_LESS(A) CPU_TYPE_IS_020_LESS(A)
#endif
#if M68K_EMULATE_010
#define CPU_TYPE_IS_010(A) ((A) == CPU_TYPE_010)
#define CPU_TYPE_IS_010_PLUS(A) ((A) & (CPU_TYPE_010 | CPU_TYPE_EC020 | CPU_TYPE_020 | CPU_TYPE_EC030 | CPU_TYPE_030 | CPU_TYPE_040 | CPU_TYPE_EC040))
#define CPU_TYPE_IS_010_LESS(A) ((A) & (CPU_TYPE_000 | CPU_TYPE_008 | CPU_TYPE_010))
#else
#define CPU_TYPE_IS_010(A) 0
#define CPU_TYPE_IS_010_PLUS(A) CPU_TYPE_IS_EC020_PLUS(A)
#define CPU_TYPE_IS_010_LESS(A) CPU_TYPE_IS_EC020_LESS(A)
#endif
#if M68K_EMULATE_020 || M68K_EMULATE_EC020
#define CPU_TYPE_IS_020_VARIANT(A) ((A) & (CPU_TYPE_EC020 | CPU_TYPE_020))
#else
#define CPU_TYPE_IS_020_VARIANT(A) 0
#endif
#if M68K_EMULATE_040 || M68K_EMULATE_020 || M68K_EMULATE_EC020 || M68K_EMULATE_010
#define CPU_TYPE_IS_000(A) ((A) == CPU_TYPE_000)
#else
#define CPU_TYPE_IS_000(A) 1
#endif
#if !M68K_SEPARATE_READS
#define m68k_read_immediate_16(A) m68ki_read_program_16(A)
#define m68k_read_immediate_32(A) m68ki_read_program_32(A)
#define m68k_read_pcrelative_8(A) m68ki_read_program_8(A)
#define m68k_read_pcrelative_16(A) m68ki_read_program_16(A)
#define m68k_read_pcrelative_32(A) m68ki_read_program_32(A)
#endif /* M68K_SEPARATE_READS */
/* Enable or disable callback functions */
#if M68K_EMULATE_INT_ACK
#if M68K_EMULATE_INT_ACK == OPT_SPECIFY_HANDLER
#define m68ki_int_ack(A) M68K_INT_ACK_CALLBACK(A)
#else
#define m68ki_int_ack(A) CALLBACK_INT_ACK(A)
#endif
#else
/* Default action is to used autovector mode, which is most common */
#define m68ki_int_ack(A) M68K_INT_ACK_AUTOVECTOR
#endif /* M68K_EMULATE_INT_ACK */
#if M68K_EMULATE_BKPT_ACK
#if M68K_EMULATE_BKPT_ACK == OPT_SPECIFY_HANDLER
#define m68ki_bkpt_ack(A) M68K_BKPT_ACK_CALLBACK(A)
#else
#define m68ki_bkpt_ack(A) CALLBACK_BKPT_ACK(A)
#endif
#else
#define m68ki_bkpt_ack(A)
#endif /* M68K_EMULATE_BKPT_ACK */
#if M68K_EMULATE_RESET
#if M68K_EMULATE_RESET == OPT_SPECIFY_HANDLER
#define m68ki_output_reset() M68K_RESET_CALLBACK()
#else
#define m68ki_output_reset() CALLBACK_RESET_INSTR()
#endif
#else
#define m68ki_output_reset()
#endif /* M68K_EMULATE_RESET */
#if M68K_CMPILD_HAS_CALLBACK
#if M68K_CMPILD_HAS_CALLBACK == OPT_SPECIFY_HANDLER
#define m68ki_cmpild_callback(v,r) M68K_CMPILD_CALLBACK(v,r)
#else
#define m68ki_cmpild_callback(v,r) CALLBACK_CMPILD_INSTR(v,r)
#endif
#else
#define m68ki_cmpild_callback(v,r)
#endif /* M68K_CMPILD_HAS_CALLBACK */
#if M68K_RTE_HAS_CALLBACK
#if M68K_RTE_HAS_CALLBACK == OPT_SPECIFY_HANDLER
#define m68ki_rte_callback() M68K_RTE_CALLBACK()
#else
#define m68ki_rte_callback() CALLBACK_RTE_INSTR()
#endif
#else
#define m68ki_rte_callback()
#endif /* M68K_RTE_HAS_CALLBACK */
#if M68K_TAS_HAS_CALLBACK
#if M68K_TAS_HAS_CALLBACK == OPT_SPECIFY_HANDLER
#define m68ki_tas_callback() M68K_TAS_CALLBACK()
#else
#define m68ki_tas_callback() CALLBACK_TAS_INSTR()
#endif
#else
#define m68ki_tas_callback() 1
#endif /* M68K_TAS_HAS_CALLBACK */
#if M68K_ILLG_HAS_CALLBACK
#if M68K_ILLG_HAS_CALLBACK == OPT_SPECIFY_HANDLER
#define m68ki_illg_callback(opcode) M68K_ILLG_CALLBACK(opcode)
#else
#define m68ki_illg_callback(opcode) CALLBACK_ILLG_INSTR(opcode)
#endif
#else
#define m68ki_illg_callback(opcode) 0 // Default is 0 = not handled, exception will occur
#endif /* M68K_ILLG_HAS_CALLBACK */
#if M68K_INSTRUCTION_HOOK
#if M68K_INSTRUCTION_HOOK == OPT_SPECIFY_HANDLER
#define m68ki_instr_hook(pc) M68K_INSTRUCTION_CALLBACK(pc)
#else
#define m68ki_instr_hook(pc) CALLBACK_INSTR_HOOK(pc)
#endif
#else
#define m68ki_instr_hook(pc)
#endif /* M68K_INSTRUCTION_HOOK */
#if M68K_MONITOR_PC
#if M68K_MONITOR_PC == OPT_SPECIFY_HANDLER
#define m68ki_pc_changed(A) M68K_SET_PC_CALLBACK(ADDRESS_68K(A))
#else
#define m68ki_pc_changed(A) CALLBACK_PC_CHANGED(ADDRESS_68K(A))
#endif
#else
#define m68ki_pc_changed(A)
#endif /* M68K_MONITOR_PC */
/* Enable or disable function code emulation */
#if M68K_EMULATE_FC
#if M68K_EMULATE_FC == OPT_SPECIFY_HANDLER
#define m68ki_set_fc(A) M68K_SET_FC_CALLBACK(A)
#else
#define m68ki_set_fc(A) CALLBACK_SET_FC(A)
#endif
#define m68ki_use_data_space() m68ki_address_space = FUNCTION_CODE_USER_DATA
#define m68ki_use_program_space() m68ki_address_space = FUNCTION_CODE_USER_PROGRAM
#define m68ki_get_address_space() m68ki_address_space
#else
#define m68ki_set_fc(A)
#define m68ki_use_data_space()
#define m68ki_use_program_space()
#define m68ki_get_address_space() FUNCTION_CODE_USER_DATA
#endif /* M68K_EMULATE_FC */
/* Enable or disable trace emulation */
#if M68K_EMULATE_TRACE
/* Initiates trace checking before each instruction (t1) */
#define m68ki_trace_t1() m68ki_tracing = FLAG_T1
/* adds t0 to trace checking if we encounter change of flow */
#define m68ki_trace_t0() m68ki_tracing |= FLAG_T0
/* Clear all tracing */
#define m68ki_clear_trace() m68ki_tracing = 0
/* Cause a trace exception if we are tracing */
#define m68ki_exception_if_trace() if(m68ki_tracing) m68ki_exception_trace()
#else
#define m68ki_trace_t1()
#define m68ki_trace_t0()
#define m68ki_clear_trace()
#define m68ki_exception_if_trace()
#endif /* M68K_EMULATE_TRACE */
/* Address error */
#if M68K_EMULATE_ADDRESS_ERROR
#include <setjmp.h>
/* sigjmp() on Mac OS X and *BSD in general saves signal contexts and is super-slow, use sigsetjmp() to tell it not to */
extern int m68ki_initial_cycles;
#ifdef _BSD_SETJMP_H
extern sigjmp_buf m68ki_aerr_trap;
#define m68ki_set_address_error_trap(m68k) \
if(sigsetjmp(m68ki_aerr_trap, 0) != 0) \
{ \
m68ki_exception_address_error(m68k); \
if(CPU_STOPPED) \
{ \
if (m68ki_remaining_cycles > 0) \
m68ki_remaining_cycles = 0; \
return m68ki_initial_cycles; \
} \
}
#define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
if((ADDR)&1) \
{ \
m68ki_aerr_address = ADDR; \
m68ki_aerr_write_mode = WRITE_MODE; \
m68ki_aerr_fc = FC; \
siglongjmp(m68ki_aerr_trap, 1); \
}
#else
extern jmp_buf m68ki_aerr_trap;
#define m68ki_set_address_error_trap() \
if(setjmp(m68ki_aerr_trap) != 0) \
{ \
m68ki_exception_address_error(); \
if(CPU_STOPPED) \
{ \
SET_CYCLES(0); \
return m68ki_initial_cycles; \
} \
/* ensure we don't re-enter execution loop after an
address error if there's no more cycles remaining */ \
if(GET_CYCLES() <= 0) \
{ \
/* return how many clocks we used */ \
return m68ki_initial_cycles - GET_CYCLES(); \
} \
}
#define m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
if((ADDR)&1) \
{ \
m68ki_aerr_address = ADDR; \
m68ki_aerr_write_mode = WRITE_MODE; \
m68ki_aerr_fc = FC; \
longjmp(m68ki_aerr_trap, 1); \
}
#endif
#define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC) \
if (CPU_TYPE_IS_010_LESS(CPU_TYPE)) \
{ \
m68ki_check_address_error(ADDR, WRITE_MODE, FC) \
}
#else
#define m68ki_set_address_error_trap()
#define m68ki_check_address_error(ADDR, WRITE_MODE, FC)
#define m68ki_check_address_error_010_less(ADDR, WRITE_MODE, FC)
#endif /* M68K_ADDRESS_ERROR */
/* Logging */
#if M68K_LOG_ENABLE
#include <stdio.h>
extern FILE* M68K_LOG_FILEHANDLE
extern const char *const m68ki_cpu_names[];
#define M68K_DO_LOG(A) if(M68K_LOG_FILEHANDLE) fprintf A
#if M68K_LOG_1010_1111
#define M68K_DO_LOG_EMU(A) if(M68K_LOG_FILEHANDLE) fprintf A
#else
#define M68K_DO_LOG_EMU(A)
#endif
#else
#define M68K_DO_LOG(A)
#define M68K_DO_LOG_EMU(A)
#endif
/* -------------------------- EA / Operand Access ------------------------- */
/*
* The general instruction format follows this pattern:
* .... XXX. .... .YYY
* where XXX is register X and YYY is register Y
*/
/* Data Register Isolation */
#define DX (REG_D[(REG_IR >> 9) & 7])
#define DY (REG_D[REG_IR & 7])
/* Address Register Isolation */
#define AX (REG_A[(REG_IR >> 9) & 7])
#define AY (REG_A[REG_IR & 7])
/* Effective Address Calculations */
#define EA_AY_AI_8() AY /* address register indirect */
#define EA_AY_AI_16() EA_AY_AI_8()
#define EA_AY_AI_32() EA_AY_AI_8()
#define EA_AY_PI_8() (AY++) /* postincrement (size = byte) */
#define EA_AY_PI_16() ((AY+=2)-2) /* postincrement (size = word) */
#define EA_AY_PI_32() ((AY+=4)-4) /* postincrement (size = long) */
#define EA_AY_PD_8() (--AY) /* predecrement (size = byte) */
#define EA_AY_PD_16() (AY-=2) /* predecrement (size = word) */
#define EA_AY_PD_32() (AY-=4) /* predecrement (size = long) */
#define EA_AY_DI_8() (AY+MAKE_INT_16(m68ki_read_imm_16())) /* displacement */
#define EA_AY_DI_16() EA_AY_DI_8()
#define EA_AY_DI_32() EA_AY_DI_8()
#define EA_AY_IX_8() m68ki_get_ea_ix(AY) /* indirect + index */
#define EA_AY_IX_16() EA_AY_IX_8()
#define EA_AY_IX_32() EA_AY_IX_8()
#define EA_AX_AI_8() AX
#define EA_AX_AI_16() EA_AX_AI_8()
#define EA_AX_AI_32() EA_AX_AI_8()
#define EA_AX_PI_8() (AX++)
#define EA_AX_PI_16() ((AX+=2)-2)
#define EA_AX_PI_32() ((AX+=4)-4)
#define EA_AX_PD_8() (--AX)
#define EA_AX_PD_16() (AX-=2)
#define EA_AX_PD_32() (AX-=4)
#define EA_AX_DI_8() (AX+MAKE_INT_16(m68ki_read_imm_16()))
#define EA_AX_DI_16() EA_AX_DI_8()
#define EA_AX_DI_32() EA_AX_DI_8()
#define EA_AX_IX_8() m68ki_get_ea_ix(AX)
#define EA_AX_IX_16() EA_AX_IX_8()
#define EA_AX_IX_32() EA_AX_IX_8()
#define EA_A7_PI_8() ((REG_A[7]+=2)-2)
#define EA_A7_PD_8() (REG_A[7]-=2)
#define EA_AW_8() MAKE_INT_16(m68ki_read_imm_16()) /* absolute word */
#define EA_AW_16() EA_AW_8()
#define EA_AW_32() EA_AW_8()
#define EA_AL_8() m68ki_read_imm_32() /* absolute long */
#define EA_AL_16() EA_AL_8()
#define EA_AL_32() EA_AL_8()
#define EA_PCDI_8() m68ki_get_ea_pcdi() /* pc indirect + displacement */
#define EA_PCDI_16() EA_PCDI_8()
#define EA_PCDI_32() EA_PCDI_8()
#define EA_PCIX_8() m68ki_get_ea_pcix() /* pc indirect + index */
#define EA_PCIX_16() EA_PCIX_8()
#define EA_PCIX_32() EA_PCIX_8()
#define OPER_I_8() m68ki_read_imm_8()
#define OPER_I_16() m68ki_read_imm_16()
#define OPER_I_32() m68ki_read_imm_32()
/* --------------------------- Status Register ---------------------------- */
/* Flag Calculation Macros */
#define CFLAG_8(A) (A)
#define CFLAG_16(A) ((A)>>8)
#if M68K_INT_GT_32_BIT
#define CFLAG_ADD_32(S, D, R) ((R)>>24)
#define CFLAG_SUB_32(S, D, R) ((R)>>24)
#else
#define CFLAG_ADD_32(S, D, R) (((S & D) | (~R & (S | D)))>>23)
#define CFLAG_SUB_32(S, D, R) (((S & R) | (~D & (S | R)))>>23)
#endif /* M68K_INT_GT_32_BIT */
#define VFLAG_ADD_8(S, D, R) ((S^R) & (D^R))
#define VFLAG_ADD_16(S, D, R) (((S^R) & (D^R))>>8)
#define VFLAG_ADD_32(S, D, R) (((S^R) & (D^R))>>24)
#define VFLAG_SUB_8(S, D, R) ((S^D) & (R^D))
#define VFLAG_SUB_16(S, D, R) (((S^D) & (R^D))>>8)
#define VFLAG_SUB_32(S, D, R) (((S^D) & (R^D))>>24)
#define NFLAG_8(A) (A)
#define NFLAG_16(A) ((A)>>8)
#define NFLAG_32(A) ((A)>>24)
#define NFLAG_64(A) ((A)>>56)
#define ZFLAG_8(A) MASK_OUT_ABOVE_8(A)
#define ZFLAG_16(A) MASK_OUT_ABOVE_16(A)
#define ZFLAG_32(A) MASK_OUT_ABOVE_32(A)
/* Flag values */
#define NFLAG_SET 0x80
#define NFLAG_CLEAR 0
#define CFLAG_SET 0x100
#define CFLAG_CLEAR 0
#define XFLAG_SET 0x100
#define XFLAG_CLEAR 0
#define VFLAG_SET 0x80
#define VFLAG_CLEAR 0
#define ZFLAG_SET 0
#define ZFLAG_CLEAR 0xffffffff
#define SFLAG_SET 4
#define SFLAG_CLEAR 0
#define MFLAG_SET 2
#define MFLAG_CLEAR 0
/* Turn flag values into 1 or 0 */
#define XFLAG_AS_1() ((FLAG_X>>8)&1)
#define NFLAG_AS_1() ((FLAG_N>>7)&1)
#define VFLAG_AS_1() ((FLAG_V>>7)&1)
#define ZFLAG_AS_1() (!FLAG_Z)
#define CFLAG_AS_1() ((FLAG_C>>8)&1)
/* Conditions */
#define COND_CS() (FLAG_C&0x100)
#define COND_CC() (!COND_CS())
#define COND_VS() (FLAG_V&0x80)
#define COND_VC() (!COND_VS())
#define COND_NE() FLAG_Z
#define COND_EQ() (!COND_NE())
#define COND_MI() (FLAG_N&0x80)
#define COND_PL() (!COND_MI())
#define COND_LT() ((FLAG_N^FLAG_V)&0x80)
#define COND_GE() (!COND_LT())
#define COND_HI() (COND_CC() && COND_NE())
#define COND_LS() (COND_CS() || COND_EQ())
#define COND_GT() (COND_GE() && COND_NE())
#define COND_LE() (COND_LT() || COND_EQ())
/* Reversed conditions */
#define COND_NOT_CS() COND_CC()
#define COND_NOT_CC() COND_CS()
#define COND_NOT_VS() COND_VC()
#define COND_NOT_VC() COND_VS()
#define COND_NOT_NE() COND_EQ()
#define COND_NOT_EQ() COND_NE()
#define COND_NOT_MI() COND_PL()
#define COND_NOT_PL() COND_MI()
#define COND_NOT_LT() COND_GE()
#define COND_NOT_GE() COND_LT()
#define COND_NOT_HI() COND_LS()
#define COND_NOT_LS() COND_HI()
#define COND_NOT_GT() COND_LE()
#define COND_NOT_LE() COND_GT()
/* Not real conditions, but here for convenience */
#define COND_XS() (FLAG_X&0x100)
#define COND_XC() (!COND_XS)
/* Get the condition code register */
#define m68ki_get_ccr() ((COND_XS() >> 4) | \
(COND_MI() >> 4) | \
(COND_EQ() << 2) | \
(COND_VS() >> 6) | \
(COND_CS() >> 8))
/* Get the status register */
#define m68ki_get_sr() ( FLAG_T1 | \
FLAG_T0 | \
(FLAG_S << 11) | \
(FLAG_M << 11) | \
FLAG_INT_MASK | \
m68ki_get_ccr())
/* ---------------------------- Cycle Counting ---------------------------- */
#define ADD_CYCLES(A) m68ki_remaining_cycles += (A)
#define USE_CYCLES(A) m68ki_remaining_cycles -= (A)
#define SET_CYCLES(A) m68ki_remaining_cycles = A
#define GET_CYCLES() m68ki_remaining_cycles
#define USE_ALL_CYCLES() m68ki_remaining_cycles %= CYC_INSTRUCTION[REG_IR]
/* ----------------------------- Read / Write ----------------------------- */
/* Read from the current address space */
#define m68ki_read_8(A) m68ki_read_8_fc (A, FLAG_S | m68ki_get_address_space())
#define m68ki_read_16(A) m68ki_read_16_fc(A, FLAG_S | m68ki_get_address_space())
#define m68ki_read_32(A) m68ki_read_32_fc(A, FLAG_S | m68ki_get_address_space())
/* Write to the current data space */
#define m68ki_write_8(A, V) m68ki_write_8_fc (A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
#define m68ki_write_16(A, V) m68ki_write_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
#define m68ki_write_32(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
#if M68K_SIMULATE_PD_WRITES
#define m68ki_write_32_pd(A, V) m68ki_write_32_pd_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
#else
#define m68ki_write_32_pd(A, V) m68ki_write_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA, V)
#endif
/* Map PC-relative reads */
#define m68ki_read_pcrel_8(A) m68k_read_pcrelative_8(A)
#define m68ki_read_pcrel_16(A) m68k_read_pcrelative_16(A)
#define m68ki_read_pcrel_32(A) m68k_read_pcrelative_32(A)
/* Read from the program space */
#define m68ki_read_program_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
#define m68ki_read_program_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
#define m68ki_read_program_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_PROGRAM)
/* Read from the data space */
#define m68ki_read_data_8(A) m68ki_read_8_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
#define m68ki_read_data_16(A) m68ki_read_16_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
#define m68ki_read_data_32(A) m68ki_read_32_fc(A, FLAG_S | FUNCTION_CODE_USER_DATA)
/* ======================================================================== */
/* =============================== PROTOTYPES ============================= */
/* ======================================================================== */
typedef union
{
uint64 i;
double f;
} fp_reg;
typedef struct
{
uint cpu_type; /* CPU Type: 68000, 68008, 68010, 68EC020, 68020, 68EC030, 68030, 68EC040, or 68040 */
uint dar[16]; /* Data and Address Registers */
uint dar_save[16]; /* Saved Data and Address Registers (pushed onto the
stack when a bus error occurs)*/
uint ppc; /* Previous program counter */
uint pc; /* Program Counter */
uint sp[7]; /* User, Interrupt, and Master Stack Pointers */
uint vbr; /* Vector Base Register (m68010+) */
uint sfc; /* Source Function Code Register (m68010+) */
uint dfc; /* Destination Function Code Register (m68010+) */
uint cacr; /* Cache Control Register (m68020, unemulated) */
uint caar; /* Cache Address Register (m68020, unemulated) */
uint ir; /* Instruction Register */
floatx80 fpr[8]; /* FPU Data Register (m68030/040) */
uint fpiar; /* FPU Instruction Address Register (m68040) */
uint fpsr; /* FPU Status Register (m68040) */
uint fpcr; /* FPU Control Register (m68040) */
uint t1_flag; /* Trace 1 */
uint t0_flag; /* Trace 0 */
uint s_flag; /* Supervisor */
uint m_flag; /* Master/Interrupt state */
uint x_flag; /* Extend */
uint n_flag; /* Negative */
uint not_z_flag; /* Zero, inverted for speedups */
uint v_flag; /* Overflow */
uint c_flag; /* Carry */
uint int_mask; /* I0-I2 */
uint int_level; /* State of interrupt pins IPL0-IPL2 -- ASG: changed from ints_pending */
uint stopped; /* Stopped state */
uint pref_addr; /* Last prefetch address */
uint pref_data; /* Data in the prefetch queue */
uint address_mask; /* Available address pins */
uint sr_mask; /* Implemented status register bits */
uint instr_mode; /* Stores whether we are in instruction mode or group 0/1 exception mode */
uint run_mode; /* Stores whether we are processing a reset, bus error, address error, or something else */
int has_pmmu; /* Indicates if a PMMU available (yes on 030, 040, no on EC030) */
int pmmu_enabled; /* Indicates if the PMMU is enabled */
int fpu_just_reset; /* Indicates the FPU was just reset */
uint reset_cycles;
/* Clocks required for instructions / exceptions */
uint cyc_bcc_notake_b;
uint cyc_bcc_notake_w;
uint cyc_dbcc_f_noexp;
uint cyc_dbcc_f_exp;
uint cyc_scc_r_true;
uint cyc_movem_w;
uint cyc_movem_l;
uint cyc_shift;
uint cyc_reset;
/* Virtual IRQ lines state */
uint virq_state;
uint nmi_pending;
/* PMMU registers */
uint mmu_crp_aptr, mmu_crp_limit;
uint mmu_srp_aptr, mmu_srp_limit;
uint mmu_tc;
uint16 mmu_sr;
const uint8* cyc_instruction;
const uint8* cyc_exception;
/* Callbacks to host */
int (*int_ack_callback)(int int_line); /* Interrupt Acknowledge */
void (*bkpt_ack_callback)(unsigned int data); /* Breakpoint Acknowledge */
void (*reset_instr_callback)(void); /* Called when a RESET instruction is encountered */
void (*cmpild_instr_callback)(unsigned int, int); /* Called when a CMPI.L #v, Dn instruction is encountered */
void (*rte_instr_callback)(void); /* Called when a RTE instruction is encountered */
int (*tas_instr_callback)(void); /* Called when a TAS instruction is encountered, allows / disallows writeback */
int (*illg_instr_callback)(int); /* Called when an illegal instruction is encountered, allows handling */