OpenCores
URL https://opencores.org/ocsvn/scarts/scarts/trunk

Subversion Repositories scarts

[/] [scarts/] [trunk/] [toolchain/] [scarts-binutils/] [binutils-2.19.1/] [opcodes/] [cr16-dis.c] - Blame information for rev 7

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 6 jlechner
/* Disassembler code for CR16.
2
   Copyright 2007, 2008 Free Software Foundation, Inc.
3
   Contributed by M R Swami Reddy (MR.Swami.Reddy@nsc.com).
4
 
5
   This file is part of GAS, GDB and the GNU binutils.
6
 
7
   This program is free software; you can redistribute it and/or modify it
8
   under the terms of the GNU General Public License as published by the
9
   Free Software Foundation; either version 3, or (at your option)
10
   any later version.
11
 
12
   This program is distributed in the hope that it will be useful, but WITHOUT
13
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
15
   more details.
16
 
17
   You should have received a copy of the GNU General Public License
18
   along with this program; if not, write to the Free Software Foundation,
19
   Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
20
 
21
#include "dis-asm.h"
22
#include "sysdep.h"
23
#include "opcode/cr16.h"
24
#include "libiberty.h"
25
 
26
/* String to print when opcode was not matched.  */
27
#define ILLEGAL  "illegal"
28
  /* Escape to 16-bit immediate.  */
29
#define ESCAPE_16_BIT  0xB
30
 
31
/* Extract 'n_bits' from 'a' starting from offset 'offs'.  */
32
#define EXTRACT(a, offs, n_bits)                    \
33
  (n_bits == 32 ? (((a) >> (offs)) & 0xffffffffL)   \
34
  : (((a) >> (offs)) & ((1 << (n_bits)) -1)))
35
 
36
/* Set Bit Mask - a mask to set all bits starting from offset 'offs'.  */
37
#define SBM(offs)  ((((1 << (32 - offs)) -1) << (offs)))
38
 
39
typedef unsigned long dwordU;
40
typedef unsigned short wordU;
41
 
42
typedef struct
43
{
44
  dwordU val;
45
  int nbits;
46
} parameter;
47
 
48
/* Structure to map valid 'cinv' instruction options.  */
49
 
50
typedef struct
51
  {
52
    /* Cinv printed string.  */
53
    char *istr;
54
    /* Value corresponding to the string.  */
55
    char *ostr;
56
  }
57
cinv_entry;
58
 
59
/* CR16 'cinv' options mapping.  */
60
const cinv_entry cr16_cinvs[] =
61
{
62
  {"cinv[i]",     "cinv    [i]"},
63
  {"cinv[i,u]",   "cinv    [i,u]"},
64
  {"cinv[d]",     "cinv    [d]"},
65
  {"cinv[d,u]",   "cinv    [d,u]"},
66
  {"cinv[d,i]",   "cinv    [d,i]"},
67
  {"cinv[d,i,u]", "cinv    [d,i,u]"}
68
};
69
 
70
/* Number of valid 'cinv' instruction options.  */
71
static int NUMCINVS = ARRAY_SIZE (cr16_cinvs);
72
 
73
/* Enum to distinguish different registers argument types.  */
74
typedef enum REG_ARG_TYPE
75
  {
76
    /* General purpose register (r<N>).  */
77
    REG_ARG = 0,
78
    /*Processor register   */
79
    P_ARG,
80
  }
81
REG_ARG_TYPE;
82
 
83
/* Current opcode table entry we're disassembling.  */
84
const inst *instruction;
85
/* Current instruction we're disassembling.  */
86
ins currInsn;
87
/* The current instruction is read into 3 consecutive words.  */
88
wordU words[3];
89
/* Contains all words in appropriate order.  */
90
ULONGLONG allWords;
91
/* Holds the current processed argument number.  */
92
int processing_argument_number;
93
/* Nonzero means a IMM4 instruction.  */
94
int imm4flag;
95
/* Nonzero means the instruction's original size is
96
   incremented (escape sequence is used).  */
97
int size_changed;
98
 
99
 
100
/* Print the constant expression length.  */
101
 
102
static char *
103
print_exp_len (int size)
104
{
105
  switch (size)
106
    {
107
    case 4:
108
    case 5:
109
    case 6:
110
    case 8:
111
    case 14:
112
    case 16:
113
      return ":s";
114
    case 20:
115
    case 24:
116
    case 32:
117
      return ":m";
118
    case 48:
119
      return ":l";
120
    default:
121
      return "";
122
    }
123
}
124
 
125
 
126
/* Retrieve the number of operands for the current assembled instruction.  */
127
 
128
static int
129
get_number_of_operands (void)
130
{
131
  int i;
132
 
133
  for (i = 0; instruction->operands[i].op_type && i < MAX_OPERANDS; i++)
134
    ;
135
 
136
  return i;
137
}
138
 
139
/* Return the bit size for a given operand.  */
140
 
141
static int
142
getbits (operand_type op)
143
{
144
  if (op < MAX_OPRD)
145
    return cr16_optab[op].bit_size;
146
 
147
  return 0;
148
}
149
 
150
/* Return the argument type of a given operand.  */
151
 
152
static argtype
153
getargtype (operand_type op)
154
{
155
  if (op < MAX_OPRD)
156
    return cr16_optab[op].arg_type;
157
 
158
  return nullargs;
159
}
160
 
161
/* Given a 'CC' instruction constant operand, return its corresponding
162
   string. This routine is used when disassembling the 'CC' instruction.  */
163
 
164
static char *
165
getccstring (unsigned cc)
166
{
167
  return (char *) cr16_b_cond_tab[cc];
168
}
169
 
170
 
171
/* Given a 'cinv' instruction constant operand, return its corresponding
172
   string. This routine is used when disassembling the 'cinv' instruction. */
173
 
174
static char *
175
getcinvstring (const char *str)
176
{
177
  const cinv_entry *cinv;
178
 
179
  for (cinv = cr16_cinvs; cinv < (cr16_cinvs + NUMCINVS); cinv++)
180
    if (strcmp (cinv->istr, str) == 0)
181
      return cinv->ostr;
182
 
183
  return ILLEGAL;
184
}
185
 
186
/* Given the trap index in dispatch table, return its name.
187
   This routine is used when disassembling the 'excp' instruction.  */
188
 
189
static char *
190
gettrapstring (unsigned int index)
191
{
192
  const trap_entry *trap;
193
 
194
  for (trap = cr16_traps; trap < cr16_traps + NUMTRAPS; trap++)
195
    if (trap->entry == index)
196
      return trap->name;
197
 
198
  return ILLEGAL;
199
}
200
 
201
/* Given a register enum value, retrieve its name.  */
202
 
203
static char *
204
getregname (reg r)
205
{
206
  const reg_entry *reg = cr16_regtab + r;
207
 
208
  if (reg->type != CR16_R_REGTYPE)
209
    return ILLEGAL;
210
 
211
  return reg->name;
212
}
213
 
214
/* Given a register pair enum value, retrieve its name.  */
215
 
216
static char *
217
getregpname (reg r)
218
{
219
  const reg_entry *reg = cr16_regptab + r;
220
 
221
  if (reg->type != CR16_RP_REGTYPE)
222
    return ILLEGAL;
223
 
224
  return reg->name;
225
}
226
 
227
/* Given a index register pair enum value, retrieve its name.  */
228
 
229
static char *
230
getidxregpname (reg r)
231
{
232
  const reg_entry *reg;
233
 
234
  switch (r)
235
   {
236
   case 0: r = 0; break;
237
   case 1: r = 2; break;
238
   case 2: r = 4; break;
239
   case 3: r = 6; break;
240
   case 4: r = 8; break;
241
   case 5: r = 10; break;
242
   case 6: r = 3; break;
243
   case 7: r = 5; break;
244
   default:
245
     break;
246
   }
247
 
248
  reg = cr16_regptab + r;
249
 
250
  if (reg->type != CR16_RP_REGTYPE)
251
    return ILLEGAL;
252
 
253
  return reg->name;
254
}
255
 
256
/* Getting a processor register name.  */
257
 
258
static char *
259
getprocregname (int index)
260
{
261
  const reg_entry *r;
262
 
263
  for (r = cr16_pregtab; r < cr16_pregtab + NUMPREGS; r++)
264
    if (r->image == index)
265
      return r->name;
266
 
267
  return "ILLEGAL REGISTER";
268
}
269
 
270
/* Getting a processor register name - 32 bit size.  */
271
 
272
static char *
273
getprocpregname (int index)
274
{
275
  const reg_entry *r;
276
 
277
  for (r = cr16_pregptab; r < cr16_pregptab + NUMPREGPS; r++)
278
    if (r->image == index)
279
      return r->name;
280
 
281
  return "ILLEGAL REGISTER";
282
}
283
 
284
/* START and END are relating 'allWords' struct, which is 48 bits size.
285
 
286
                          START|--------|END
287
             +---------+---------+---------+---------+
288
             |         |   V    |     A    |   L     |
289
             +---------+---------+---------+---------+
290
 
291
    words                  [0]       [1]       [2]      */
292
 
293
static parameter
294
makelongparameter (ULONGLONG val, int start, int end)
295
{
296
  parameter p;
297
 
298
  p.val = (dwordU) EXTRACT (val, 48 - end, end - start);
299
  p.nbits = end - start;
300
  return p;
301
}
302
 
303
/* Build a mask of the instruction's 'constant' opcode,
304
   based on the instruction's printing flags.  */
305
 
306
static unsigned long
307
build_mask (void)
308
{
309
  unsigned long mask = SBM (instruction->match_bits);
310
 
311
  /* Adjust mask for bcond with 32-bit size instruction.  */
312
  if ((IS_INSN_MNEMONIC("b") && instruction->size == 2))
313
    mask = 0xff0f0000;
314
 
315
  return mask;
316
}
317
 
318
/* Search for a matching opcode. Return 1 for success, 0 for failure.  */
319
 
320
static int
321
match_opcode (void)
322
{
323
  unsigned long mask;
324
  /* The instruction 'constant' opcode doewsn't exceed 32 bits.  */
325
  unsigned long doubleWord = words[1] + (words[0] << 16);
326
 
327
  /* Start searching from end of instruction table.  */
328
  instruction = &cr16_instruction[NUMOPCODES - 2];
329
 
330
  /* Loop over instruction table until a full match is found.  */
331
  while (instruction >= cr16_instruction)
332
    {
333
      mask = build_mask ();
334
      if ((doubleWord & mask) == BIN (instruction->match,
335
                                      instruction->match_bits))
336
        return 1;
337
      else
338
        instruction--;
339
    }
340
  return 0;
341
}
342
 
343
/* Set the proper parameter value for different type of arguments.  */
344
 
345
static void
346
make_argument (argument * a, int start_bits)
347
{
348
  int inst_bit_size;
349
  parameter p;
350
 
351
  if ((instruction->size == 3) && a->size >= 16)
352
    inst_bit_size = 48;
353
  else
354
    inst_bit_size = 32;
355
 
356
  switch (a->type)
357
    {
358
    case arg_r:
359
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
360
                             inst_bit_size - start_bits);
361
      a->r = p.val;
362
      break;
363
 
364
    case arg_rp:
365
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
366
                             inst_bit_size - start_bits);
367
      a->rp = p.val;
368
      break;
369
 
370
    case arg_pr:
371
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
372
                             inst_bit_size - start_bits);
373
      a->pr = p.val;
374
      break;
375
 
376
    case arg_prp:
377
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
378
                             inst_bit_size - start_bits);
379
      a->prp = p.val;
380
      break;
381
 
382
    case arg_ic:
383
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
384
                             inst_bit_size - start_bits);
385
      a->constant = p.val;
386
      break;
387
 
388
    case arg_cc:
389
      p = makelongparameter (allWords, inst_bit_size - (start_bits + a->size),
390
                             inst_bit_size - start_bits);
391
 
392
      a->cc = p.val;
393
      break;
394
 
395
    case arg_idxr:
396
      if ((IS_INSN_MNEMONIC ("cbitb"))
397
          || (IS_INSN_MNEMONIC ("sbitb"))
398
          || (IS_INSN_MNEMONIC ("tbitb")))
399
        p = makelongparameter (allWords, 8, 9);
400
      else
401
        p = makelongparameter (allWords, 9, 10);
402
      a->i_r = p.val;
403
      p = makelongparameter (allWords, inst_bit_size - a->size, inst_bit_size);
404
      a->constant = p.val;
405
      break;
406
 
407
    case arg_idxrp:
408
      p = makelongparameter (allWords, start_bits + 12, start_bits + 13);
409
      a->i_r = p.val;
410
      p = makelongparameter (allWords, start_bits + 13, start_bits + 16);
411
      a->rp = p.val;
412
      if (inst_bit_size > 32)
413
        {
414
          p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
415
                                 inst_bit_size);
416
          a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
417
        }
418
      else if (instruction->size == 2)
419
        {
420
          p = makelongparameter (allWords, inst_bit_size - 22, inst_bit_size);
421
          a->constant = (p.val & 0xf) | (((p.val >>20) & 0x3) << 4)
422
            | ((p.val >>14 & 0x3) << 6) | (((p.val >>7) & 0x1f) <<7);
423
        }
424
      else if (instruction->size == 1 && a->size == 0)
425
        a->constant = 0;
426
 
427
      break;
428
 
429
    case arg_rbase:
430
      p = makelongparameter (allWords, inst_bit_size, inst_bit_size);
431
      a->constant = p.val;
432
      p = makelongparameter (allWords, inst_bit_size - (start_bits + 4),
433
                             inst_bit_size - start_bits);
434
      a->r = p.val;
435
      break;
436
 
437
    case arg_cr:
438
      p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
439
      a->r = p.val;
440
      p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
441
      a->constant = p.val;
442
      break;
443
 
444
    case arg_crp:
445
      if (instruction->size == 1)
446
        p = makelongparameter (allWords, 12, 16);
447
      else
448
        p = makelongparameter (allWords, start_bits + 12, start_bits + 16);
449
      a->rp = p.val;
450
 
451
      if (inst_bit_size > 32)
452
        {
453
          p = makelongparameter (allWords, inst_bit_size - start_bits - 12,
454
                                 inst_bit_size);
455
          a->constant = ((p.val & 0xffff) | (p.val >> 8 & 0xf0000));
456
        }
457
      else if (instruction->size == 2)
458
        {
459
          p = makelongparameter (allWords, inst_bit_size - 16, inst_bit_size);
460
          a->constant = p.val;
461
        }
462
      else if (instruction->size == 1 && a->size != 0)
463
        {
464
          p = makelongparameter (allWords, 4, 8);
465
          if (IS_INSN_MNEMONIC ("loadw")
466
              || IS_INSN_MNEMONIC ("loadd")
467
              || IS_INSN_MNEMONIC ("storw")
468
              || IS_INSN_MNEMONIC ("stord"))
469
            a->constant = (p.val * 2);
470
          else
471
            a->constant = p.val;
472
        }
473
      else /* below case for 0x0(reg pair) */
474
        a->constant = 0;
475
 
476
      break;
477
 
478
    case arg_c:
479
 
480
      if ((IS_INSN_TYPE (BRANCH_INS))
481
          || (IS_INSN_MNEMONIC ("bal"))
482
          || (IS_INSN_TYPE (CSTBIT_INS))
483
          || (IS_INSN_TYPE (LD_STOR_INS)))
484
        {
485
          switch (a->size)
486
            {
487
            case 8 :
488
              p = makelongparameter (allWords, 0, start_bits);
489
              a->constant = ((((p.val&0xf00)>>4)) | (p.val&0xf));
490
              break;
491
 
492
            case 24:
493
              if (instruction->size == 3)
494
                {
495
                  p = makelongparameter (allWords, 16, inst_bit_size);
496
                  a->constant = ((((p.val>>16)&0xf) << 20)
497
                                 | (((p.val>>24)&0xf) << 16)
498
                                 | (p.val & 0xffff));
499
                }
500
              else if (instruction->size == 2)
501
                {
502
                  p = makelongparameter (allWords, 8, inst_bit_size);
503
                  a->constant = p.val;
504
                }
505
              break;
506
 
507
            default:
508
              p = makelongparameter (allWords, inst_bit_size - (start_bits +
509
                                                                a->size), inst_bit_size - start_bits);
510
              a->constant = p.val;
511
              break;
512
            }
513
        }
514
      else
515
        {
516
          p = makelongparameter (allWords, inst_bit_size -
517
                                 (start_bits + a->size),
518
                                 inst_bit_size - start_bits);
519
          a->constant = p.val;
520
        }
521
      break;
522
 
523
    default:
524
      break;
525
    }
526
}
527
 
528
/*  Print a single argument.  */
529
 
530
static void
531
print_arg (argument *a, bfd_vma memaddr, struct disassemble_info *info)
532
{
533
  LONGLONG longdisp, mask;
534
  int sign_flag = 0;
535
  int relative = 0;
536
  bfd_vma number;
537
  PTR stream = info->stream;
538
  fprintf_ftype func = info->fprintf_func;
539
 
540
  switch (a->type)
541
    {
542
    case arg_r:
543
      func (stream, "%s", getregname (a->r));
544
      break;
545
 
546
    case arg_rp:
547
      func (stream, "%s", getregpname (a->rp));
548
      break;
549
 
550
    case arg_pr:
551
      func (stream, "%s", getprocregname (a->pr));
552
      break;
553
 
554
    case arg_prp:
555
      func (stream, "%s", getprocpregname (a->prp));
556
      break;
557
 
558
    case arg_cc:
559
      func (stream, "%s", getccstring (a->cc));
560
      func (stream, "%s", "\t");
561
      break;
562
 
563
    case arg_ic:
564
      if (IS_INSN_MNEMONIC ("excp"))
565
        {
566
          func (stream, "%s", gettrapstring (a->constant));
567
          break;
568
        }
569
      else if ((IS_INSN_TYPE (ARITH_INS) || IS_INSN_TYPE (ARITH_BYTE_INS))
570
               && ((instruction->size == 1) && (a->constant == 9)))
571
        func (stream, "$%d", -1);
572
      else if (INST_HAS_REG_LIST)
573
        func (stream, "$0x%lx", a->constant +1);
574
      else if (IS_INSN_TYPE (SHIFT_INS))
575
        {
576
          longdisp = a->constant;
577
          mask = ((LONGLONG)1 << a->size) - 1;
578
          if (longdisp & ((LONGLONG)1 << (a->size -1)))
579
            {
580
              sign_flag = 1;
581
              longdisp = ~(longdisp) + 1;
582
            }
583
          a->constant = (unsigned long int) (longdisp & mask);
584
          func (stream, "$%d", ((int)(sign_flag ? -a->constant :
585
                                      a->constant)));
586
        }
587
      else
588
        func (stream, "$0x%lx", a->constant);
589
      switch (a->size)
590
        {
591
        case 4  : case 5  : case 6  : case 8  :
592
          func (stream, "%s", ":s"); break;
593
        case 16 : case 20 : func (stream, "%s", ":m"); break;
594
        case 24 : case 32 : func (stream, "%s", ":l"); break;
595
        default: break;
596
        }
597
      break;
598
 
599
    case arg_idxr:
600
      if (a->i_r == 0) func (stream, "[r12]");
601
      if (a->i_r == 1) func (stream, "[r13]");
602
      func (stream, "0x%lx", a->constant);
603
      func (stream, "%s", print_exp_len (instruction->size * 16));
604
      break;
605
 
606
    case arg_idxrp:
607
      if (a->i_r == 0) func (stream, "[r12]");
608
      if (a->i_r == 1) func (stream, "[r13]");
609
      func (stream, "0x%lx", a->constant);
610
      func (stream, "%s", print_exp_len (instruction->size * 16));
611
      func (stream, "%s", getidxregpname (a->rp));
612
      break;
613
 
614
    case arg_rbase:
615
      func (stream, "(%s)", getregname (a->r));
616
      break;
617
 
618
    case arg_cr:
619
      func (stream, "0x%lx", a->constant);
620
      func (stream, "%s", print_exp_len (instruction->size * 16));
621
      func (stream, "(%s)", getregname (a->r));
622
      break;
623
 
624
    case arg_crp:
625
      func (stream, "0x%lx", a->constant);
626
      func (stream, "%s", print_exp_len (instruction->size * 16));
627
      func (stream, "%s", getregpname (a->rp));
628
      break;
629
 
630
    case arg_c:
631
      /*Removed the *2 part as because implicit zeros are no more required.
632
        Have to fix this as this needs a bit of extension in terms of branch
633
        instructions. */
634
      if (IS_INSN_TYPE (BRANCH_INS) || IS_INSN_MNEMONIC ("bal"))
635
        {
636
          relative = 1;
637
          longdisp = a->constant;
638
          /* REVISIT: To sync with WinIDEA and CR16 4.1tools, the below
639
             line commented */
640
          /* longdisp <<= 1; */
641
          mask = ((LONGLONG)1 << a->size) - 1;
642
          switch (a->size)
643
            {
644
            case 8  :
645
              {
646
                longdisp <<= 1;
647
                if (longdisp & ((LONGLONG)1 << a->size))
648
                  {
649
                    sign_flag = 1;
650
                    longdisp = ~(longdisp) + 1;
651
                  }
652
                break;
653
              }
654
            case 16 :
655
            case 24 :
656
              {
657
                if (longdisp & 1)
658
                  {
659
                    sign_flag = 1;
660
                    longdisp = ~(longdisp) + 1;
661
                  }
662
                break;
663
              }
664
            default:
665
              func (stream, "Wrong offset used in branch/bal instruction");
666
              break;
667
            }
668
          a->constant = (unsigned long int) (longdisp & mask);
669
        }
670
      /* For branch Neq instruction it is 2*offset + 2.  */
671
      else if (IS_INSN_TYPE (BRANCH_NEQ_INS))
672
        a->constant = 2 * a->constant + 2;
673
 
674
      if ((!IS_INSN_TYPE (CSTBIT_INS)) && (!IS_INSN_TYPE (LD_STOR_INS)))
675
        (sign_flag) ? func (stream, "%s", "*-"): func (stream, "%s","*+");
676
 
677
      func (stream, "%s", "0x");
678
      number = ((relative ? memaddr : 0) +
679
                (sign_flag ? ((- a->constant) & 0xffffffe) : a->constant));
680
 
681
      (*info->print_address_func) ((number & ((1 << 24) - 1)), info);
682
 
683
      func (stream, "%s", print_exp_len (instruction->size * 16));
684
      break;
685
 
686
    default:
687
      break;
688
    }
689
}
690
 
691
/* Print all the arguments of CURRINSN instruction.  */
692
 
693
static void
694
print_arguments (ins *currInsn, bfd_vma memaddr, struct disassemble_info *info)
695
{
696
  int i;
697
 
698
  /* For "pop/push/popret RA instruction only.  */
699
  if ((IS_INSN_MNEMONIC ("pop")
700
       || (IS_INSN_MNEMONIC ("popret")
701
           || (IS_INSN_MNEMONIC ("push"))))
702
      && currInsn->nargs == 1)
703
    {
704
      info->fprintf_func (info->stream, "RA");
705
      return;
706
    }
707
 
708
  for (i = 0; i < currInsn->nargs; i++)
709
    {
710
      processing_argument_number = i;
711
 
712
      /* For "bal (ra), disp17" instruction only.  */
713
      if ((IS_INSN_MNEMONIC ("bal")) && (i == 0) && instruction->size == 2)
714
        {
715
          info->fprintf_func (info->stream, "(ra),");
716
          continue;
717
        }
718
 
719
      if ((INST_HAS_REG_LIST) && (i == 2))
720
        info->fprintf_func (info->stream, "RA");
721
      else
722
        print_arg (&currInsn->arg[i], memaddr, info);
723
 
724
      if ((i != currInsn->nargs - 1) && (!IS_INSN_MNEMONIC ("b")))
725
        info->fprintf_func (info->stream, ",");
726
    }
727
}
728
 
729
/* Build the instruction's arguments.  */
730
 
731
static void
732
make_instruction (void)
733
{
734
  int i;
735
  unsigned int shift;
736
 
737
  for (i = 0; i < currInsn.nargs; i++)
738
    {
739
      argument a;
740
 
741
      memset (&a, 0, sizeof (a));
742
      a.type = getargtype (instruction->operands[i].op_type);
743
      a.size = getbits (instruction->operands[i].op_type);
744
      shift = instruction->operands[i].shift;
745
 
746
      make_argument (&a, shift);
747
      currInsn.arg[i] = a;
748
    }
749
 
750
  /* Calculate instruction size (in bytes).  */
751
  currInsn.size = instruction->size + (size_changed ? 1 : 0);
752
  /* Now in bits.  */
753
  currInsn.size *= 2;
754
}
755
 
756
/* Retrieve a single word from a given memory address.  */
757
 
758
static wordU
759
get_word_at_PC (bfd_vma memaddr, struct disassemble_info *info)
760
{
761
  bfd_byte buffer[4];
762
  int status;
763
  wordU insn = 0;
764
 
765
  status = info->read_memory_func (memaddr, buffer, 2, info);
766
 
767
  if (status == 0)
768
    insn = (wordU) bfd_getl16 (buffer);
769
 
770
  return insn;
771
}
772
 
773
/* Retrieve multiple words (3) from a given memory address.  */
774
 
775
static void
776
get_words_at_PC (bfd_vma memaddr, struct disassemble_info *info)
777
{
778
  int i;
779
  bfd_vma mem;
780
 
781
  for (i = 0, mem = memaddr; i < 3; i++, mem += 2)
782
    words[i] = get_word_at_PC (mem, info);
783
 
784
  allWords =
785
    ((ULONGLONG) words[0] << 32) + ((unsigned long) words[1] << 16) + words[2];
786
}
787
 
788
/* Prints the instruction by calling print_arguments after proper matching.  */
789
 
790
int
791
print_insn_cr16 (bfd_vma memaddr, struct disassemble_info *info)
792
{
793
  int is_decoded;     /* Nonzero means instruction has a match.  */
794
 
795
  /* Initialize global variables.  */
796
  imm4flag = 0;
797
  size_changed = 0;
798
 
799
  /* Retrieve the encoding from current memory location.  */
800
  get_words_at_PC (memaddr, info);
801
  /* Find a matching opcode in table.  */
802
  is_decoded = match_opcode ();
803
  /* If found, print the instruction's mnemonic and arguments.  */
804
  if (is_decoded > 0 && (words[0] << 16 || words[1]) != 0)
805
    {
806
      if (strneq (instruction->mnemonic, "cinv", 4))
807
        info->fprintf_func (info->stream,"%s", getcinvstring (instruction->mnemonic));
808
      else
809
        info->fprintf_func (info->stream, "%s", instruction->mnemonic);
810
 
811
      if (((currInsn.nargs = get_number_of_operands ()) != 0)
812
          && ! (IS_INSN_MNEMONIC ("b")))
813
        info->fprintf_func (info->stream, "\t");
814
      make_instruction ();
815
      /* For push/pop/pushrtn with RA instructions.  */
816
      if ((INST_HAS_REG_LIST) && ((words[0] >> 7) & 0x1))
817
        currInsn.nargs +=1;
818
      print_arguments (&currInsn, memaddr, info);
819
      return currInsn.size;
820
    }
821
 
822
  /* No match found.  */
823
  info->fprintf_func (info->stream,"%s ",ILLEGAL);
824
  return 2;
825
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.