aboutsummaryrefslogtreecommitdiff
path: root/sim/mips/sim-main.h
blob: 5dd7071d25dd1fa1c285930d98742fb81f23f140 (plain)
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
/* MIPS Simulator definition.
   Copyright (C) 1997 Free Software Foundation, Inc.
   Contributed by Cygnus Support.

This file is part of GDB, the GNU debugger.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef SIM_MAIN_H
#define SIM_MAIN_H

/* This simulator doesn't cache the Current Instruction Address */
/* #define SIM_ENGINE_HALT_HOOK(SD, LAST_CPU, CIA) */
/* #define SIM_ENGINE_RESUME_HOOK(SD, LAST_CPU, CIA) */

#define SIM_HAVE_BIENDIAN


/* hobble some common features for moment */
#define WITH_WATCHPOINTS 1
#define WITH_MODULO_MEMORY 1

#include "sim-basics.h"

typedef address_word sim_cia;

#if (WITH_IGEN)
/* Get the number of instructions.  FIXME: must be a more elegant way
   of doing this.  */
#include "itable.h"
#define MAX_INSNS (nr_itable_entries)
#define INSN_NAME(i) itable[(i)].name
#endif

#include "sim-base.h"


/* Depreciated macros and types for manipulating 64bit values.  Use
   ../common/sim-bits.h and ../common/sim-endian.h macros instead. */

typedef signed64 word64;
typedef unsigned64 uword64;

#define WORD64LO(t)     (unsigned int)((t)&0xFFFFFFFF)
#define WORD64HI(t)     (unsigned int)(((uword64)(t))>>32)
#define SET64LO(t)      (((uword64)(t))&0xFFFFFFFF)
#define SET64HI(t)	(((uword64)(t))<<32)
#define WORD64(h,l)     ((word64)((SET64HI(h)|SET64LO(l))))
#define UWORD64(h,l)     (SET64HI(h)|SET64LO(l))

/* Sign-extend the given value (e) as a value (b) bits long. We cannot
   assume the HI32bits of the operand are zero, so we must perform a
   mask to ensure we can use the simple subtraction to sign-extend. */
#define SIGNEXTEND(e,b) \
 ((unsigned_word) \
  (((e) & ((uword64) 1 << ((b) - 1))) \
   ? (((e) & (((uword64) 1 << (b)) - 1)) - ((uword64)1 << (b))) \
   : ((e) & (((((uword64) 1 << ((b) - 1)) - 1) << 1) | 1))))

/* Check if a value will fit within a halfword: */
#define NOTHALFWORDVALUE(v) ((((((uword64)(v)>>16) == 0) && !((v) & ((unsigned)1 << 15))) || (((((uword64)(v)>>32) == 0xFFFFFFFF) && ((((uword64)(v)>>16) & 0xFFFF) == 0xFFFF)) && ((v) & ((unsigned)1 << 15)))) ? (1 == 0) : (1 == 1))



/* Floating-point operations: */

#include "sim-fpu.h"

/* FPU registers must be one of the following types. All other values
   are reserved (and undefined). */
typedef enum {
 fmt_single  = 0,
 fmt_double  = 1,
 fmt_word    = 4,
 fmt_long    = 5,
 /* The following are well outside the normal acceptable format
    range, and are used in the register status vector. */
 fmt_unknown       = 0x10000000,
 fmt_uninterpreted = 0x20000000,
 fmt_uninterpreted_32 = 0x40000000,
 fmt_uninterpreted_64 = 0x80000000,
} FP_formats;

unsigned64 value_fpr PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int fpr, FP_formats));
#define ValueFPR(FPR,FMT) value_fpr (SD, CPU, cia, (FPR), (FMT))

void store_fpr PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int fpr, FP_formats fmt, unsigned64 value));
#define StoreFPR(FPR,FMT,VALUE) store_fpr (SD, CPU, cia, (FPR), (FMT), (VALUE))

int NaN PARAMS ((unsigned64 op, FP_formats fmt));
int Infinity PARAMS ((unsigned64 op, FP_formats fmt));
int Less PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
int Equal PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 AbsoluteValue PARAMS ((unsigned64 op, FP_formats fmt));
unsigned64 Negate PARAMS ((unsigned64 op, FP_formats fmt));
unsigned64 Add PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 Sub PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 Multiply PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 Divide PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 Recip PARAMS ((unsigned64 op, FP_formats fmt));
unsigned64 SquareRoot PARAMS ((unsigned64 op, FP_formats fmt));
unsigned64 Max PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 Min PARAMS ((unsigned64 op1, unsigned64 op2, FP_formats fmt));
unsigned64 convert PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int rm, unsigned64 op, FP_formats from, FP_formats to));
#define Convert(rm,op,from,to) \
convert (SD, CPU, cia, rm, op, from, to)

/* Macro to update FPSR condition-code field. This is complicated by
   the fact that there is a hole in the index range of the bits within
   the FCSR register. Also, the number of bits visible depends on the
   MIPS ISA version being supported. */

#define SETFCC(cc,v) {\
  int bit = ((cc == 0) ? 23 : (24 + (cc)));\
  FCSR = ((FCSR & ~(1 << bit)) | ((v) << bit));\
}
#define GETFCC(cc) (((((cc) == 0) ? (FCSR & (1 << 23)) : (FCSR & (1 << (24 + (cc))))) != 0) ? 1 : 0)

/* This should be the COC1 value at the start of the preceding
   instruction: */
#define PREVCOC1() ((STATE & simPCOC1) ? 1 : 0)

#if 1
#define SizeFGR() (WITH_TARGET_FLOATING_POINT_BITSIZE)
#else
/* They depend on the CPU being simulated */
#define SizeFGR() ((WITH_TARGET_WORD_BITSIZE == 64 && ((SR & status_FR) == 1)) ? 64 : 32)
#endif

/* Standard FCRS bits: */
#define IR (0) /* Inexact Result */
#define UF (1) /* UnderFlow */
#define OF (2) /* OverFlow */
#define DZ (3) /* Division by Zero */
#define IO (4) /* Invalid Operation */
#define UO (5) /* Unimplemented Operation */

/* Get masks for individual flags: */
#if 1 /* SAFE version */
#define FP_FLAGS(b)  (((unsigned)(b) < 5) ? (1 << ((b) + 2)) : 0)
#define FP_ENABLE(b) (((unsigned)(b) < 5) ? (1 << ((b) + 7)) : 0)
#define FP_CAUSE(b)  (((unsigned)(b) < 6) ? (1 << ((b) + 12)) : 0)
#else
#define FP_FLAGS(b)  (1 << ((b) + 2))
#define FP_ENABLE(b) (1 << ((b) + 7))
#define FP_CAUSE(b)  (1 << ((b) + 12))
#endif

#define FP_FS         (1 << 24) /* MIPS III onwards : Flush to Zero */

#define FP_MASK_RM    (0x3)
#define FP_SH_RM      (0)
#define FP_RM_NEAREST (0) /* Round to nearest        (Round) */
#define FP_RM_TOZERO  (1) /* Round to zero           (Trunc) */
#define FP_RM_TOPINF  (2) /* Round to Plus infinity  (Ceil) */
#define FP_RM_TOMINF  (3) /* Round to Minus infinity (Floor) */
#define GETRM()       (int)((FCSR >> FP_SH_RM) & FP_MASK_RM)



/* Integer ALU operations: */

#include "sim-alu.h"

#define ALU32_END(ANS) \
  if (ALU32_HAD_OVERFLOW) \
    SignalExceptionIntegerOverflow (); \
  (ANS) = ALU32_OVERFLOW_RESULT


#define ALU64_END(ANS) \
  if (ALU64_HAD_OVERFLOW) \
    SignalExceptionIntegerOverflow (); \
  (ANS) = ALU64_OVERFLOW_RESULT;


/* start-sanitize-r5900 */

/* Figure 10-5 FPU Control/Status Register.
   Note: some of these bits are different to what is found in a
   standard MIPS manual. */
enum {
  R5900_FCSR_C = BIT (23), /* OK */
  R5900_FCSR_I = BIT (17),
  R5900_FCSR_D = BIT (16),
  R5900_FCSR_O = BIT (15),
  R5900_FCSR_U = BIT (14),
  R5900_FCSR_CAUSE = MASK (16,14),
  R5900_FCSR_SI = BIT (6),
  R5900_FCSR_SD = BIT (5),
  R5900_FCSR_SO = BIT (4),
  R5900_FCSR_SU = BIT (3),
};

typedef struct _sim_r5900_cpu {

  /* The R5900 has 32 x 128bit general purpose registers.
     Fortunatly, the high 64 bits are only touched by multimedia (MMI)
     instructions.  The normal mips instructions just use the lower 64
     bits.  To avoid changing the older parts of the simulator to
     handle this weirdness, the high 64 bits of each register are kept
     in a separate array (registers1).  The high 64 bits of any
     register are by convention refered by adding a '1' to the end of
     the normal register's name.  So LO still refers to the low 64
     bits of the LO register, LO1 refers to the high 64 bits of that
     same register.  */
  signed_word gpr1[32];
#define GPR1     ((CPU)->r5900.gpr1)
  signed_word lo1;
  signed_word hi1;
#define LO1      ((CPU)->r5900.lo1)
#define HI1      ((CPU)->r5900.hi1)

  /* The R5900 defines a shift amount register, that controls the
     amount of certain shift instructions */
  unsigned_word sa;        /* the shift amount register */
#define REGISTER_SA	(124) /* GET RID IF THIS! */
#define SA ((CPU)->r5900.sa)

  /* The R5900, in addition to the (almost) standard floating point
     registers, defines a 32 bit accumulator.  This is used in
     multiply/accumulate style instructions */
  fp_word acc; /* floating-point accumulator */
#define ACC ((CPU)->r5900.acc)

  /* See comments below about needing to count cycles between updating
     and setting HI/LO registers */
  int hi1access;
  int lo1access;
#define HI1ACCESS ((CPU)->r5900.hi1access)
#define LO1ACCESS ((CPU)->r5900.lo1access)
#if 0
#define CHECKHILO(s) {\
  if ((HIACCESS != 0) || (LOACCESS != 0) || (HI1ACCESS != 0) || (LO1ACCESS != 0))\
    sim_io_eprintf(sd,"%s over-writing HI and LO registers values (PC = 0x%s HLPC = 0x%s)\n",(s),pr_addr(PC),pr_addr(HLPC));\
}
#endif

} sim_r5900_cpu;

#define BYTES_IN_MMI_REGS       (sizeof(signed_word) + sizeof(signed_word))
#define HALFWORDS_IN_MMI_REGS   (BYTES_IN_MMI_REGS/2)
#define WORDS_IN_MMI_REGS       (BYTES_IN_MMI_REGS/4)
#define DOUBLEWORDS_IN_MMI_REGS (BYTES_IN_MMI_REGS/8)

#define BYTES_IN_MIPS_REGS       (sizeof(signed_word))
#define HALFWORDS_IN_MIPS_REGS   (BYTES_IN_MIPS_REGS/2)
#define WORDS_IN_MIPS_REGS       (BYTES_IN_MIPS_REGS/4)
#define DOUBLEWORDS_IN_MIPS_REGS (BYTES_IN_MIPS_REGS/8)

/* SUB_REG_FETCH - return as lvalue some sub-part of a "register"
   T  - type of the sub part
   TC - # of T's in the mips part of the "register"
   I  - index (from 0) of desired sub part
   A  - low part of "register"
   A1 - high part of register
*/
#define SUB_REG_FETCH(T,TC,A,A1,I) \
(*(((I) < (TC) ? (T*)(A) : (T*)(A1)) \
   + (CURRENT_HOST_BYTE_ORDER == BIG_ENDIAN \
      ? ((TC) - 1 - (I) % (TC)) \
      : ((I) % (TC)) \
      ) \
   ) \
 )

/* 
GPR_<type>(R,I) - return, as lvalue, the I'th <type> of general register R 
            where <type> has two letters:
                  1 is S=signed or U=unsigned
                  2 is B=byte H=halfword W=word D=doubleword 
*/

#define SUB_REG_SB(A,A1,I) SUB_REG_FETCH(signed8,  BYTES_IN_MIPS_REGS,       A, A1, I)
#define SUB_REG_SH(A,A1,I) SUB_REG_FETCH(signed16, HALFWORDS_IN_MIPS_REGS,   A, A1, I)
#define SUB_REG_SW(A,A1,I) SUB_REG_FETCH(signed32, WORDS_IN_MIPS_REGS,       A, A1, I)
#define SUB_REG_SD(A,A1,I) SUB_REG_FETCH(signed64, DOUBLEWORDS_IN_MIPS_REGS, A, A1, I)

#define SUB_REG_UB(A,A1,I) SUB_REG_FETCH(unsigned8,  BYTES_IN_MIPS_REGS,       A, A1, I)
#define SUB_REG_UH(A,A1,I) SUB_REG_FETCH(unsigned16, HALFWORDS_IN_MIPS_REGS,   A, A1, I)
#define SUB_REG_UW(A,A1,I) SUB_REG_FETCH(unsigned32, WORDS_IN_MIPS_REGS,       A, A1, I)
#define SUB_REG_UD(A,A1,I) SUB_REG_FETCH(unsigned64, DOUBLEWORDS_IN_MIPS_REGS, A, A1, I)
  
#define GPR_SB(R,I) SUB_REG_SB(&GPR[R], &GPR1[R], I)
#define GPR_SH(R,I) SUB_REG_SH(&GPR[R], &GPR1[R], I)
#define GPR_SW(R,I) SUB_REG_SW(&GPR[R], &GPR1[R], I)
#define GPR_SD(R,I) SUB_REG_SD(&GPR[R], &GPR1[R], I)

#define GPR_UB(R,I) SUB_REG_UB(&GPR[R], &GPR1[R], I)
#define GPR_UH(R,I) SUB_REG_UH(&GPR[R], &GPR1[R], I)
#define GPR_UW(R,I) SUB_REG_UW(&GPR[R], &GPR1[R], I)
#define GPR_UD(R,I) SUB_REG_UD(&GPR[R], &GPR1[R], I)


#define RS_SB(I) SUB_REG_SB(&rs_reg, &rs_reg1, I)
#define RS_SH(I) SUB_REG_SH(&rs_reg, &rs_reg1, I)
#define RS_SW(I) SUB_REG_SW(&rs_reg, &rs_reg1, I)
#define RS_SD(I) SUB_REG_SD(&rs_reg, &rs_reg1, I)

#define RS_UB(I) SUB_REG_UB(&rs_reg, &rs_reg1, I)
#define RS_UH(I) SUB_REG_UH(&rs_reg, &rs_reg1, I)
#define RS_UW(I) SUB_REG_UW(&rs_reg, &rs_reg1, I)
#define RS_UD(I) SUB_REG_UD(&rs_reg, &rs_reg1, I)

#define RT_SB(I) SUB_REG_SB(&rt_reg, &rt_reg1, I)
#define RT_SH(I) SUB_REG_SH(&rt_reg, &rt_reg1, I)
#define RT_SW(I) SUB_REG_SW(&rt_reg, &rt_reg1, I)
#define RT_SD(I) SUB_REG_SD(&rt_reg, &rt_reg1, I)

#define RT_UB(I) SUB_REG_UB(&rt_reg, &rt_reg1, I)
#define RT_UH(I) SUB_REG_UH(&rt_reg, &rt_reg1, I)
#define RT_UW(I) SUB_REG_UW(&rt_reg, &rt_reg1, I)
#define RT_UD(I) SUB_REG_UD(&rt_reg, &rt_reg1, I)



#define LO_SB(I) SUB_REG_SB(&LO, &LO1, I)
#define LO_SH(I) SUB_REG_SH(&LO, &LO1, I)
#define LO_SW(I) SUB_REG_SW(&LO, &LO1, I)
#define LO_SD(I) SUB_REG_SD(&LO, &LO1, I)

#define LO_UB(I) SUB_REG_UB(&LO, &LO1, I)
#define LO_UH(I) SUB_REG_UH(&LO, &LO1, I)
#define LO_UW(I) SUB_REG_UW(&LO, &LO1, I)
#define LO_UD(I) SUB_REG_UD(&LO, &LO1, I)

#define HI_SB(I) SUB_REG_SB(&HI, &HI1, I)
#define HI_SH(I) SUB_REG_SH(&HI, &HI1, I)
#define HI_SW(I) SUB_REG_SW(&HI, &HI1, I)
#define HI_SD(I) SUB_REG_SD(&HI, &HI1, I)

#define HI_UB(I) SUB_REG_UB(&HI, &HI1, I)
#define HI_UH(I) SUB_REG_UH(&HI, &HI1, I)
#define HI_UW(I) SUB_REG_UW(&HI, &HI1, I)
#define HI_UD(I) SUB_REG_UD(&HI, &HI1, I)

/* end-sanitize-r5900 */



/* The following is probably not used for MIPS IV onwards: */
/* Slots for delayed register updates. For the moment we just have a
   fixed number of slots (rather than a more generic, dynamic
   system). This keeps the simulator fast. However, we only allow
   for the register update to be delayed for a single instruction
   cycle. */
#define PSLOTS (8) /* Maximum number of instruction cycles */

typedef struct _pending_write_queue {
  int in;
  int out;
  int total;
  int slot_delay[PSLOTS];
  int slot_size[PSLOTS];
  int slot_bit[PSLOTS];
  void *slot_dest[PSLOTS];
  unsigned64 slot_value[PSLOTS];
} pending_write_queue;

#ifndef PENDING_TRACE
#define PENDING_TRACE 0
#endif
#define PENDING_IN ((CPU)->pending.in)
#define PENDING_OUT ((CPU)->pending.out)
#define PENDING_TOTAL ((CPU)->pending.total)
#define PENDING_SLOT_SIZE ((CPU)->pending.slot_size)
#define PENDING_SLOT_BIT ((CPU)->pending.slot_size)
#define PENDING_SLOT_DELAY ((CPU)->pending.slot_delay)
#define PENDING_SLOT_DEST ((CPU)->pending.slot_dest)
#define PENDING_SLOT_VALUE ((CPU)->pending.slot_value)

/* Invalidate the pending write queue, all pending writes are
   discarded. */

#define PENDING_INVALIDATE() \
memset (&(CPU)->pending, 0, sizeof ((CPU)->pending))

/* Schedule a write to DEST for N cycles time.  For 64 bit
   destinations, schedule two writes.  For floating point registers,
   the caller should schedule a write to both the dest register and
   the FPR_STATE register.  When BIT is non-negative, only BIT of DEST
   is updated. */

#define PENDING_SCHED(DEST,VAL,DELAY,BIT)				\
  do {									\
    if (PENDING_SLOT_DEST[PENDING_IN] != NULL)				\
      sim_engine_abort (SD, CPU, cia,					\
		        "PENDING_SCHED - buffer overflow\n");		\
    if (PENDING_TRACE)							\
      sim_io_printf (SD, "PENDING_SCHED - dest 0x%lx, val 0x%lx, pending_in %d, pending_out %d, pending_total %d\n", (unsigned long) (DEST), (unsigned long) (VAL), PENDING_IN, PENDING_OUT, PENDING_TOTAL); \
    PENDING_SLOT_DELAY[PENDING_IN] = (DELAY) + 1;			\
    PENDING_SLOT_DEST[PENDING_IN] = &(DEST);				\
    PENDING_SLOT_VALUE[PENDING_IN] = (VAL);				\
    PENDING_SLOT_SIZE[PENDING_IN] = sizeof (DEST);			\
    PENDING_SLOT_BIT[PENDING_IN] = (BIT);				\
  } while (0)

#define PENDING_WRITE(DEST,VAL,DELAY) PENDING_SCHED(DEST,VAL,DELAY,-1)
#define PENDING_BIT(DEST,VAL,DELAY,BIT) PENDING_SCHED(DEST,VAL,DELAY,BIT)

#define PENDING_TICK() pending_tick (SD, CPU, cia)

#define PENDING_FLUSH() abort () /* think about this one */
#define PENDING_FP() abort () /* think about this one */

/* For backward compatibility */
#define PENDING_FILL(R,VAL) 						\
{									\
  if ((R) >= FGRIDX && (R) < FGRIDX + NR_FGR)				\
    PENDING_SCHED(FGR[(R) - FGRIDX], VAL, 2, -1);			\
  else									\
    PENDING_SCHED(GPR[(R)], VAL, 2, -1);				\
}



struct _sim_cpu {


  /* The following are internal simulator state variables: */
#define CIA_GET(CPU) ((CPU)->registers[PCIDX] + 0)
#define CIA_SET(CPU,CIA) ((CPU)->registers[PCIDX] = (CIA))
  address_word dspc;  /* delay-slot PC */
#define DSPC ((CPU)->dspc)

  /* Issue a delay slot instruction immediatly by re-calling
     idecode_issue */
#define DELAY_SLOT(TARGET) \
  do { \
    address_word target = (TARGET); \
    instruction_word delay_insn; \
    sim_events_slip (SD, 1); \
    CIA = CIA + 4; /* NOTE not mips16 */ \
    STATE |= simDELAYSLOT; \
    delay_insn = IMEM32 (CIA); /* NOTE not mips16 */ \
    idecode_issue (CPU_, delay_insn, (CIA)); \
    STATE &= ~simDELAYSLOT; \
    NIA = target; \
  } while (0)
#define NULLIFY_NEXT_INSTRUCTION() \
  do { \
    sim_events_slip (SD, 1); \
    dotrace (SD, CPU, tracefh, 2, NIA, 4, "load instruction"); \
    NIA = CIA + 8; \
  } while (0)



  /* State of the simulator */
  unsigned int state;
  unsigned int dsstate;
#define STATE ((CPU)->state)
#define DSSTATE ((CPU)->dsstate)

/* Flags in the "state" variable: */
#define simHALTEX       (1 << 2)  /* 0 = run; 1 = halt on exception */
#define simHALTIN       (1 << 3)  /* 0 = run; 1 = halt on interrupt */
#define simTRACE        (1 << 8)  /* 0 = do nothing; 1 = trace address activity */
#define simPCOC0        (1 << 17) /* COC[1] from current */
#define simPCOC1        (1 << 18) /* COC[1] from previous */
#define simDELAYSLOT    (1 << 24) /* 0 = do nothing; 1 = delay slot entry exists */
#define simSKIPNEXT     (1 << 25) /* 0 = do nothing; 1 = skip instruction */
#define simSIGINT	(1 << 28)  /* 0 = do nothing; 1 = SIGINT has occured */
#define simJALDELAYSLOT	(1 << 29) /* 1 = in jal delay slot */

#define ENGINE_ISSUE_PREFIX_HOOK() \
  { \
    /* Perform any pending writes */ \
    PENDING_TICK(); \
    /* Set previous flag, depending on current: */ \
    if (STATE & simPCOC0) \
     STATE |= simPCOC1; \
    else \
     STATE &= ~simPCOC1; \
    /* and update the current value: */ \
    if (GETFCC(0)) \
     STATE |= simPCOC0; \
    else \
     STATE &= ~simPCOC0; \
  }


/* This is nasty, since we have to rely on matching the register
   numbers used by GDB. Unfortunately, depending on the MIPS target
   GDB uses different register numbers. We cannot just include the
   relevant "gdb/tm.h" link, since GDB may not be configured before
   the sim world, and also the GDB header file requires too much other
   state. */

#ifndef TM_MIPS_H
#define LAST_EMBED_REGNUM (89)
#define NUM_REGS (LAST_EMBED_REGNUM + 1)
/* start-sanitize-r5900 */
#undef NUM_REGS
#define NUM_REGS (128)
/* end-sanitize-r5900 */
#endif

/* start-sanitize-sky */
#ifdef TARGET_SKY
#ifndef TM_TXVU_H

/* Number of machine registers */
#define NUM_VU_REGS 152

#define NUM_R5900_REGS 128

#undef NUM_REGS
#define NUM_REGS (NUM_R5900_REGS + 2*(NUM_VU_REGS))
#endif /* no tm-txvu.h */
#endif
/* end-sanitize-sky */

/* To keep this default simulator simple, and fast, we use a direct
   vector of registers. The internal simulator engine then uses
   manifests to access the correct slot. */

  unsigned_word registers[LAST_EMBED_REGNUM + 1];
  int register_widths[NUM_REGS];
#define REGISTERS       ((CPU)->registers)

#define GPR     (&REGISTERS[0])
#define GPR_SET(N,VAL) (REGISTERS[(N)] = (VAL))

  /* While space is allocated for the floating point registers in the
     main registers array, they are stored separatly.  This is because
     their size may not necessarily match the size of either the
     general-purpose or system specific registers */
#define NR_FGR  (32)
#define FGRIDX  (38)
  fp_word fgr[NR_FGR];
#define FGR     ((CPU)->fgr)

#define LO      (REGISTERS[33])
#define HI      (REGISTERS[34])
#define PCIDX	37
#define PC      (REGISTERS[PCIDX])
#define CAUSE   (REGISTERS[36])
#define SRIDX   (32)
#define SR      (REGISTERS[SRIDX])      /* CPU status register */
#define FCR0IDX  (71)
#define FCR0    (REGISTERS[FCR0IDX])    /* really a 32bit register */
#define FCR31IDX (70)
#define FCR31   (REGISTERS[FCR31IDX])   /* really a 32bit register */
#define FCSR    (FCR31)
#define Debug	(REGISTERS[86])
#define DEPC	(REGISTERS[87])
#define EPC	(REGISTERS[88])
#define COCIDX  (LAST_EMBED_REGNUM + 2) /* special case : outside the normal range */

  unsigned_word c0_config_reg;
#define C0_CONFIG ((CPU)->c0_config_reg)

/* The following are pseudonyms for standard registers */
#define ZERO    (REGISTERS[0])
#define V0      (REGISTERS[2])
#define A0      (REGISTERS[4])
#define A1      (REGISTERS[5])
#define A2      (REGISTERS[6])
#define A3      (REGISTERS[7])
#define SP      (REGISTERS[29])
#define RA      (REGISTERS[31])

  /* Keep the current format state for each register: */
  FP_formats fpr_state[32];
#define FPR_STATE ((CPU)->fpr_state)

  pending_write_queue pending;

  /* LLBIT = Load-Linked bit. A bit of "virtual" state used by atomic
     read-write instructions. It is set when a linked load occurs. It
     is tested and cleared by the conditional store. It is cleared
     (during other CPU operations) when a store to the location would
     no longer be atomic. In particular, it is cleared by exception
     return instructions. */
  int llbit;
#define LLBIT ((CPU)->llbit)


#if 0
/* The HIACCESS and LOACCESS counts are used to ensure that
   corruptions caused by using the HI or LO register to close to a
   following operation are spotted. */

  int hiaccess;
  int loaccess;
#define HIACCESS ((CPU)->hiaccess)
#define LOACCESS ((CPU)->loaccess)

  unsigned_word HLPC;
  /* If either of the preceding two instructions have accessed the HI
     or LO registers, then the values they see should be
     undefined. However, to keep the simulator world simple, we just
     let them use the value read and raise a warning to notify the
     user: */
#define CHECKHILO(s) {\
  if ((HIACCESS != 0) || (LOACCESS != 0)) \
    sim_io_eprintf(sd,"%s over-writing HI and LO registers values (PC = 0x%s HLPC = 0x%s)\n",(s),pr_addr(PC),pr_addr(HLPC));\
}
#endif

#if !defined CHECKHILO
  /* The 4300 and a few other processors have interlocks on hi/lo
     register reads, and hence do not have this problem.  To avoid
     spurious warnings, we just disable this always.  */
#define CHECKHILO(s)
#endif

  /* start-sanitize-r5900 */
  sim_r5900_cpu r5900;

  /* end-sanitize-r5900 */
  /* start-sanitize-vr5400 */

  /* The MDMX ISA has a very very large accumulator */
  unsigned8 acc[3 * 8];
  /* end-sanitize-vr5400 */

  sim_cpu_base base;
};


/* MIPS specific simulator watch config */

void watch_options_install PARAMS ((SIM_DESC sd));

struct swatch {
  sim_event *pc;
  sim_event *clock;
  sim_event *cycles;
};


/* FIXME: At present much of the simulator is still static */
struct sim_state {

  struct swatch watch;

  sim_cpu cpu[MAX_NR_PROCESSORS];
#if (WITH_SMP)
#define STATE_CPU(sd,n) (&(sd)->cpu[n])
#else
#define STATE_CPU(sd,n) (&(sd)->cpu[0])
#endif

  sim_state_base base;
};



/* Status information: */

/* TODO : these should be the bitmasks for these bits within the
   status register. At the moment the following are VR4300
   bit-positions: */
#define status_KSU_mask  (0x3)          /* mask for KSU bits */
#define status_KSU_shift (3)            /* shift for field */
#define ksu_kernel       (0x0)
#define ksu_supervisor   (0x1)
#define ksu_user         (0x2)
#define ksu_unknown      (0x3)

#define status_IE	 (1 <<  0)      /* Interrupt enable */
#define status_EXL	 (1 <<  1)	/* Exception level */
#define status_RE        (1 << 25)      /* Reverse Endian in user mode */
#define status_FR        (1 << 26)      /* enables MIPS III additional FP registers */
#define status_SR        (1 << 20)      /* soft reset or NMI */
#define status_BEV       (1 << 22)      /* Location of general exception vectors */
#define status_TS        (1 << 21)      /* TLB shutdown has occurred */
#define status_ERL       (1 <<  2)      /* Error level */
#define status_RP        (1 << 27)      /* Reduced Power mode */

#define cause_BD        ((unsigned)1 << 31)     /* Exception in branch delay slot */

/* NOTE: We keep the following status flags as bit values (1 for true,
   0 for false). This allows them to be used in binary boolean
   operations without worrying about what exactly the non-zero true
   value is. */

/* UserMode */
#define UserMode        ((((SR & status_KSU_mask) >> status_KSU_shift) == ksu_user) ? 1 : 0)

/* BigEndianMem */
/* Hardware configuration. Affects endianness of LoadMemory and
   StoreMemory and the endianness of Kernel and Supervisor mode
   execution. The value is 0 for little-endian; 1 for big-endian. */
#define BigEndianMem    (CURRENT_TARGET_BYTE_ORDER == BIG_ENDIAN)
/*(state & simBE) ? 1 : 0)*/

/* ReverseEndian */
/* This mode is selected if in User mode with the RE bit being set in
   SR (Status Register). It reverses the endianness of load and store
   instructions. */
#define ReverseEndian   (((SR & status_RE) && UserMode) ? 1 : 0)

/* BigEndianCPU */
/* The endianness for load and store instructions (0=little;1=big). In
   User mode this endianness may be switched by setting the state_RE
   bit in the SR register. Thus, BigEndianCPU may be computed as
   (BigEndianMem EOR ReverseEndian). */
#define BigEndianCPU    (BigEndianMem ^ ReverseEndian) /* Already bits */



/* Exceptions: */

/* NOTE: These numbers depend on the processor architecture being
   simulated: */
#define Interrupt               (0)
#define TLBModification         (1)
#define TLBLoad                 (2)
#define TLBStore                (3)
#define AddressLoad             (4)
#define AddressStore            (5)
#define InstructionFetch        (6)
#define DataReference           (7)
#define SystemCall              (8)
#define BreakPoint              (9)
#define ReservedInstruction     (10)
#define CoProcessorUnusable     (11)
#define IntegerOverflow         (12)    /* Arithmetic overflow (IDT monitor raises SIGFPE) */
#define Trap                    (13)
#define FPE                     (15)
#define DebugBreakPoint         (16)
#define Watch                   (23)

/* The following exception code is actually private to the simulator
   world. It is *NOT* a processor feature, and is used to signal
   run-time errors in the simulator. */
#define SimulatorFault      (0xFFFFFFFF)

void signal_exception (SIM_DESC sd, sim_cpu *cpu, address_word cia, int exception, ...);
#define SignalException(exc,instruction)     signal_exception (SD, CPU, cia, (exc), (instruction))
#define SignalExceptionInterrupt()           signal_exception (SD, CPU, NULL_CIA, Interrupt)
#define SignalExceptionInstructionFetch()    signal_exception (SD, CPU, cia, InstructionFetch)
#define SignalExceptionAddressStore()        signal_exception (SD, CPU, cia, AddressStore)
#define SignalExceptionAddressLoad()         signal_exception (SD, CPU, cia, AddressLoad)
#define SignalExceptionSimulatorFault(buf)   signal_exception (SD, CPU, cia, SimulatorFault, buf)
#define SignalExceptionFPE()                 signal_exception (SD, CPU, cia, FPE)
#define SignalExceptionIntegerOverflow()     signal_exception (SD, CPU, cia, IntegerOverflow)
#define SignalExceptionCoProcessorUnusable() signal_exception (SD, CPU, cia, CoProcessorUnusable)


/* Co-processor accesses */

void cop_lw  PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg, unsigned int memword));
void cop_ld  PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg, uword64 memword));
unsigned int cop_sw PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg));
uword64 cop_sd PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int coproc_num, int coproc_reg));

#define COP_LW(coproc_num,coproc_reg,memword) \
cop_lw (SD, CPU, cia, coproc_num, coproc_reg, memword)
#define COP_LD(coproc_num,coproc_reg,memword) \
cop_ld (SD, CPU, cia, coproc_num, coproc_reg, memword)
#define COP_SW(coproc_num,coproc_reg) \
cop_sw (SD, CPU, cia, coproc_num, coproc_reg)
#define COP_SD(coproc_num,coproc_reg) \
cop_sd (SD, CPU, cia, coproc_num, coproc_reg)

void decode_coproc PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, unsigned int instruction));
#define DecodeCoproc(instruction) \
decode_coproc (SD, CPU, cia, (instruction))



/* Memory accesses */

/* The following are generic to all versions of the MIPS architecture
   to date: */

/* Memory Access Types (for CCA): */
#define Uncached                (0)
#define CachedNoncoherent       (1)
#define CachedCoherent          (2)
#define Cached                  (3)

#define isINSTRUCTION   (1 == 0) /* FALSE */
#define isDATA          (1 == 1) /* TRUE */
#define isLOAD          (1 == 0) /* FALSE */
#define isSTORE         (1 == 1) /* TRUE */
#define isREAL          (1 == 0) /* FALSE */
#define isRAW           (1 == 1) /* TRUE */
/* The parameter HOST (isTARGET / isHOST) is ignored */
#define isTARGET        (1 == 0) /* FALSE */
/* #define isHOST          (1 == 1) TRUE */

/* The "AccessLength" specifications for Loads and Stores. NOTE: This
   is the number of bytes minus 1. */
#define AccessLength_BYTE       (0)
#define AccessLength_HALFWORD   (1)
#define AccessLength_TRIPLEBYTE (2)
#define AccessLength_WORD       (3)
#define AccessLength_QUINTIBYTE (4)
#define AccessLength_SEXTIBYTE  (5)
#define AccessLength_SEPTIBYTE  (6)
#define AccessLength_DOUBLEWORD (7)
#define AccessLength_QUADWORD   (15)

int address_translation PARAMS ((SIM_DESC sd, sim_cpu *, address_word cia, address_word vAddr, int IorD, int LorS, address_word *pAddr, int *CCA, int raw));
#define AddressTranslation(vAddr,IorD,LorS,pAddr,CCA,host,raw) \
address_translation (SD, CPU, cia, vAddr, IorD, LorS, pAddr, CCA, raw)

void load_memory PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, uword64* memvalp, uword64* memval1p, int CCA, int AccessLength, address_word pAddr, address_word vAddr, int IorD));
#define LoadMemory(memvalp,memval1p,CCA,AccessLength,pAddr,vAddr,IorD,raw) \
load_memory (SD, CPU, cia, memvalp, memval1p, CCA, AccessLength, pAddr, vAddr, IorD)

void store_memory PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int CCA, int AccessLength, uword64 MemElem, uword64 MemElem1, address_word pAddr, address_word vAddr));
#define StoreMemory(CCA,AccessLength,MemElem,MemElem1,pAddr,vAddr,raw) \
store_memory (SD, CPU, cia, CCA, AccessLength, MemElem, MemElem1, pAddr, vAddr)

void cache_op PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int op, address_word pAddr, address_word vAddr, unsigned int instruction));
#define CacheOp(op,pAddr,vAddr,instruction) \
cache_op (SD, CPU, cia, op, pAddr, vAddr, instruction)

void sync_operation PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int stype));
#define SyncOperation(stype) \
sync_operation (SD, CPU, cia, (stype))

void prefetch PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, int CCA, address_word pAddr, address_word vAddr, int DATA, int hint));
#define Prefetch(CCA,pAddr,vAddr,DATA,hint) \
prefetch (SD, CPU, cia, CCA, pAddr, vAddr, DATA, hint)

unsigned32 ifetch32 PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, address_word vaddr));
#define IMEM32(CIA) ifetch32 (SD, CPU, (CIA), (CIA))
unsigned16 ifetch16 PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia, address_word vaddr));
#define IMEM16(CIA,NR) ifetch16 (SD, CPU, (CIA), ((CIA) & ~1) + 2 * (NR))
#define IMEM16_IMMED(CIA,NR) ifetch16 (SD, CPU, (CIA), ((CIA) & ~1) + 2 * (NR))

void dotrace PARAMS ((SIM_DESC sd, sim_cpu *cpu, FILE *tracefh, int type, SIM_ADDR address, int width, char *comment, ...));
FILE *tracefh;

void pending_tick PARAMS ((SIM_DESC sd, sim_cpu *cpu, address_word cia));

#endif