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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [opcodes/] [cris-dis.c] - Blame information for rev 816

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1 227 jeremybenn
/* Disassembler code for CRIS.
2
   Copyright 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009
3
   Free Software Foundation, Inc.
4
   Contributed by Axis Communications AB, Lund, Sweden.
5
   Written by Hans-Peter Nilsson.
6
 
7
   This file is part of the GNU opcodes library.
8
 
9
   This library is free software; you can redistribute it and/or modify
10
   it under the terms of the GNU General Public License as published by
11
   the Free Software Foundation; either version 3, or (at your option)
12
   any later version.
13
 
14
   It is distributed in the hope that it will be useful, but WITHOUT
15
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
17
   License for more details.
18
 
19
   You should have received a copy of the GNU General Public License
20
   along with this program; if not, write to the Free Software
21
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22
   MA 02110-1301, USA.  */
23
 
24
#include "dis-asm.h"
25
#include "sysdep.h"
26
#include "opcode/cris.h"
27
#include "libiberty.h"
28
 
29
/* No instruction will be disassembled longer than this.  In theory, and
30
   in silicon, address prefixes can be cascaded.  In practice, cascading
31
   is not used by GCC, and not supported by the assembler.  */
32
#ifndef MAX_BYTES_PER_CRIS_INSN
33
#define MAX_BYTES_PER_CRIS_INSN 8
34
#endif
35
 
36
/* Whether or not to decode prefixes, folding it into the following
37
   instruction.  FIXME: Make this optional later.  */
38
#ifndef PARSE_PREFIX
39
#define PARSE_PREFIX 1
40
#endif
41
 
42
/* Sometimes we prefix all registers with this character.  */
43
#define REGISTER_PREFIX_CHAR '$'
44
 
45
/* Whether or not to trace the following sequence:
46
   sub* X,r%d
47
   bound* Y,r%d
48
   adds.w [pc+r%d.w],pc
49
 
50
   This is the assembly form of a switch-statement in C.
51
   The "sub is optional.  If there is none, then X will be zero.
52
   X is the value of the first case,
53
   Y is the number of cases (including default).
54
 
55
   This results in case offsets printed on the form:
56
    case N: -> case_address
57
   where N is an estimation on the corresponding 'case' operand in C,
58
   and case_address is where execution of that case continues after the
59
   sequence presented above.
60
 
61
   The old style of output was to print the offsets as instructions,
62
   which made it hard to follow "case"-constructs in the disassembly,
63
   and caused a lot of annoying warnings about undefined instructions.
64
 
65
   FIXME: Make this optional later.  */
66
#ifndef TRACE_CASE
67
#define TRACE_CASE (disdata->trace_case)
68
#endif
69
 
70
enum cris_disass_family
71
 { cris_dis_v0_v10, cris_dis_common_v10_v32, cris_dis_v32 };
72
 
73
/* Stored in the disasm_info->private_data member.  */
74
struct cris_disasm_data
75
{
76
  /* Whether to print something less confusing if we find something
77
     matching a switch-construct.  */
78
  bfd_boolean trace_case;
79
 
80
  /* Whether this code is flagged as crisv32.  FIXME: Should be an enum
81
     that includes "compatible".  */
82
  enum cris_disass_family distype;
83
};
84
 
85
/* Value of first element in switch.  */
86
static long case_offset = 0;
87
 
88
/* How many more case-offsets to print.  */
89
static long case_offset_counter = 0;
90
 
91
/* Number of case offsets.  */
92
static long no_of_case_offsets = 0;
93
 
94
/* Candidate for next case_offset.  */
95
static long last_immediate = 0;
96
 
97
static int cris_constraint
98
  (const char *, unsigned, unsigned, struct cris_disasm_data *);
99
 
100
/* Parse disassembler options and store state in info.  FIXME: For the
101
   time being, we abuse static variables.  */
102
 
103
static bfd_boolean
104
cris_parse_disassembler_options (disassemble_info *info,
105
                                 enum cris_disass_family distype)
106
{
107
  struct cris_disasm_data *disdata;
108
 
109
  info->private_data = calloc (1, sizeof (struct cris_disasm_data));
110
  disdata = (struct cris_disasm_data *) info->private_data;
111
  if (disdata == NULL)
112
    return FALSE;
113
 
114
  /* Default true.  */
115
  disdata->trace_case
116
    = (info->disassembler_options == NULL
117
       || (strcmp (info->disassembler_options, "nocase") != 0));
118
 
119
  disdata->distype = distype;
120
  return TRUE;
121
}
122
 
123
static const struct cris_spec_reg *
124
spec_reg_info (unsigned int sreg, enum cris_disass_family distype)
125
{
126
  int i;
127
 
128
  for (i = 0; cris_spec_regs[i].name != NULL; i++)
129
    {
130
      if (cris_spec_regs[i].number == sreg)
131
        {
132
          if (distype == cris_dis_v32)
133
            switch (cris_spec_regs[i].applicable_version)
134
              {
135
              case cris_ver_warning:
136
              case cris_ver_version_all:
137
              case cris_ver_v3p:
138
              case cris_ver_v8p:
139
              case cris_ver_v10p:
140
              case cris_ver_v32p:
141
                /* No ambiguous sizes or register names with CRISv32.  */
142
                if (cris_spec_regs[i].warning == NULL)
143
                  return &cris_spec_regs[i];
144
              default:
145
                ;
146
              }
147
          else if (cris_spec_regs[i].applicable_version != cris_ver_v32p)
148
            return &cris_spec_regs[i];
149
        }
150
    }
151
 
152
  return NULL;
153
}
154
 
155
/* Return the number of bits in the argument.  */
156
 
157
static int
158
number_of_bits (unsigned int val)
159
{
160
  int bits;
161
 
162
  for (bits = 0; val != 0; val &= val - 1)
163
    bits++;
164
 
165
  return bits;
166
}
167
 
168
/* Get an entry in the opcode-table.  */
169
 
170
static const struct cris_opcode *
171
get_opcode_entry (unsigned int insn,
172
                  unsigned int prefix_insn,
173
                  struct cris_disasm_data *disdata)
174
{
175
  /* For non-prefixed insns, we keep a table of pointers, indexed by the
176
     insn code.  Each entry is initialized when found to be NULL.  */
177
  static const struct cris_opcode **opc_table = NULL;
178
 
179
  const struct cris_opcode *max_matchedp = NULL;
180
  const struct cris_opcode **prefix_opc_table = NULL;
181
 
182
  /* We hold a table for each prefix that need to be handled differently.  */
183
  static const struct cris_opcode **dip_prefixes = NULL;
184
  static const struct cris_opcode **bdapq_m1_prefixes = NULL;
185
  static const struct cris_opcode **bdapq_m2_prefixes = NULL;
186
  static const struct cris_opcode **bdapq_m4_prefixes = NULL;
187
  static const struct cris_opcode **rest_prefixes = NULL;
188
 
189
  /* Allocate and clear the opcode-table.  */
190
  if (opc_table == NULL)
191
    {
192
      opc_table = malloc (65536 * sizeof (opc_table[0]));
193
      if (opc_table == NULL)
194
        return NULL;
195
 
196
      memset (opc_table, 0, 65536 * sizeof (const struct cris_opcode *));
197
 
198
      dip_prefixes
199
        = malloc (65536 * sizeof (const struct cris_opcode **));
200
      if (dip_prefixes == NULL)
201
        return NULL;
202
 
203
      memset (dip_prefixes, 0, 65536 * sizeof (dip_prefixes[0]));
204
 
205
      bdapq_m1_prefixes
206
        = malloc (65536 * sizeof (const struct cris_opcode **));
207
      if (bdapq_m1_prefixes == NULL)
208
        return NULL;
209
 
210
      memset (bdapq_m1_prefixes, 0, 65536 * sizeof (bdapq_m1_prefixes[0]));
211
 
212
      bdapq_m2_prefixes
213
        = malloc (65536 * sizeof (const struct cris_opcode **));
214
      if (bdapq_m2_prefixes == NULL)
215
        return NULL;
216
 
217
      memset (bdapq_m2_prefixes, 0, 65536 * sizeof (bdapq_m2_prefixes[0]));
218
 
219
      bdapq_m4_prefixes
220
        = malloc (65536 * sizeof (const struct cris_opcode **));
221
      if (bdapq_m4_prefixes == NULL)
222
        return NULL;
223
 
224
      memset (bdapq_m4_prefixes, 0, 65536 * sizeof (bdapq_m4_prefixes[0]));
225
 
226
      rest_prefixes
227
        = malloc (65536 * sizeof (const struct cris_opcode **));
228
      if (rest_prefixes == NULL)
229
        return NULL;
230
 
231
      memset (rest_prefixes, 0, 65536 * sizeof (rest_prefixes[0]));
232
    }
233
 
234
  /* Get the right table if this is a prefix.
235
     This code is connected to cris_constraints in that it knows what
236
     prefixes play a role in recognition of patterns; the necessary
237
     state is reflected by which table is used.  If constraints
238
     involving match or non-match of prefix insns are changed, then this
239
     probably needs changing too.  */
240
  if (prefix_insn != NO_CRIS_PREFIX)
241
    {
242
      const struct cris_opcode *popcodep
243
        = (opc_table[prefix_insn] != NULL
244
           ? opc_table[prefix_insn]
245
           : get_opcode_entry (prefix_insn, NO_CRIS_PREFIX, disdata));
246
 
247
      if (popcodep == NULL)
248
        return NULL;
249
 
250
      if (popcodep->match == BDAP_QUICK_OPCODE)
251
        {
252
          /* Since some offsets are recognized with "push" macros, we
253
             have to have different tables for them.  */
254
          int offset = (prefix_insn & 255);
255
 
256
          if (offset > 127)
257
            offset -= 256;
258
 
259
          switch (offset)
260
            {
261
            case -4:
262
              prefix_opc_table = bdapq_m4_prefixes;
263
              break;
264
 
265
            case -2:
266
              prefix_opc_table = bdapq_m2_prefixes;
267
              break;
268
 
269
            case -1:
270
              prefix_opc_table = bdapq_m1_prefixes;
271
              break;
272
 
273
            default:
274
              prefix_opc_table = rest_prefixes;
275
              break;
276
            }
277
        }
278
      else if (popcodep->match == DIP_OPCODE)
279
        /* We don't allow postincrement when the prefix is DIP, so use a
280
           different table for DIP.  */
281
        prefix_opc_table = dip_prefixes;
282
      else
283
        prefix_opc_table = rest_prefixes;
284
    }
285
 
286
  if (prefix_insn != NO_CRIS_PREFIX
287
      && prefix_opc_table[insn] != NULL)
288
    max_matchedp = prefix_opc_table[insn];
289
  else if (prefix_insn == NO_CRIS_PREFIX && opc_table[insn] != NULL)
290
    max_matchedp = opc_table[insn];
291
  else
292
    {
293
      const struct cris_opcode *opcodep;
294
      int max_level_of_match = -1;
295
 
296
      for (opcodep = cris_opcodes;
297
           opcodep->name != NULL;
298
           opcodep++)
299
        {
300
          int level_of_match;
301
 
302
          if (disdata->distype == cris_dis_v32)
303
            {
304
              switch (opcodep->applicable_version)
305
                {
306
                case cris_ver_version_all:
307
                  break;
308
 
309
                case cris_ver_v0_3:
310
                case cris_ver_v0_10:
311
                case cris_ver_v3_10:
312
                case cris_ver_sim_v0_10:
313
                case cris_ver_v8_10:
314
                case cris_ver_v10:
315
                case cris_ver_warning:
316
                  continue;
317
 
318
                case cris_ver_v3p:
319
                case cris_ver_v8p:
320
                case cris_ver_v10p:
321
                case cris_ver_v32p:
322
                  break;
323
 
324
                case cris_ver_v8:
325
                  abort ();
326
                default:
327
                  abort ();
328
                }
329
            }
330
          else
331
            {
332
              switch (opcodep->applicable_version)
333
                {
334
                case cris_ver_version_all:
335
                case cris_ver_v0_3:
336
                case cris_ver_v3p:
337
                case cris_ver_v0_10:
338
                case cris_ver_v8p:
339
                case cris_ver_v8_10:
340
                case cris_ver_v10:
341
                case cris_ver_sim_v0_10:
342
                case cris_ver_v10p:
343
                case cris_ver_warning:
344
                  break;
345
 
346
                case cris_ver_v32p:
347
                  continue;
348
 
349
                case cris_ver_v8:
350
                  abort ();
351
                default:
352
                  abort ();
353
                }
354
            }
355
 
356
          /* We give a double lead for bits matching the template in
357
             cris_opcodes.  Not even, because then "move p8,r10" would
358
             be given 2 bits lead over "clear.d r10".  When there's a
359
             tie, the first entry in the table wins.  This is
360
             deliberate, to avoid a more complicated recognition
361
             formula.  */
362
          if ((opcodep->match & insn) == opcodep->match
363
              && (opcodep->lose & insn) == 0
364
              && ((level_of_match
365
                   = cris_constraint (opcodep->args,
366
                                      insn,
367
                                      prefix_insn,
368
                                      disdata))
369
                  >= 0)
370
              && ((level_of_match
371
                   += 2 * number_of_bits (opcodep->match
372
                                          | opcodep->lose))
373
                          > max_level_of_match))
374
                    {
375
                      max_matchedp = opcodep;
376
                      max_level_of_match = level_of_match;
377
 
378
                      /* If there was a full match, never mind looking
379
                         further.  */
380
                      if (level_of_match >= 2 * 16)
381
                        break;
382
                    }
383
                }
384
      /* Fill in the new entry.
385
 
386
         If there are changes to the opcode-table involving prefixes, and
387
         disassembly then does not work correctly, try removing the
388
         else-clause below that fills in the prefix-table.  If that
389
         helps, you need to change the prefix_opc_table setting above, or
390
         something related.  */
391
      if (prefix_insn == NO_CRIS_PREFIX)
392
        opc_table[insn] = max_matchedp;
393
      else
394
        prefix_opc_table[insn] = max_matchedp;
395
    }
396
 
397
  return max_matchedp;
398
}
399
 
400
/* Return -1 if the constraints of a bitwise-matched instruction say
401
   that there is no match.  Otherwise return a nonnegative number
402
   indicating the confidence in the match (higher is better).  */
403
 
404
static int
405
cris_constraint (const char *cs,
406
                 unsigned int insn,
407
                 unsigned int prefix_insn,
408
                 struct cris_disasm_data *disdata)
409
{
410
  int retval = 0;
411
  int tmp;
412
  int prefix_ok = 0;
413
  const char *s;
414
 
415
  for (s = cs; *s; s++)
416
    switch (*s)
417
      {
418
      case '!':
419
        /* Do not recognize "pop" if there's a prefix and then only for
420
           v0..v10.  */
421
        if (prefix_insn != NO_CRIS_PREFIX
422
            || disdata->distype != cris_dis_v0_v10)
423
          return -1;
424
        break;
425
 
426
      case 'U':
427
        /* Not recognized at disassembly.  */
428
        return -1;
429
 
430
      case 'M':
431
        /* Size modifier for "clear", i.e. special register 0, 4 or 8.
432
           Check that it is one of them.  Only special register 12 could
433
           be mismatched, but checking for matches is more logical than
434
           checking for mismatches when there are only a few cases.  */
435
        tmp = ((insn >> 12) & 0xf);
436
        if (tmp != 0 && tmp != 4 && tmp != 8)
437
          return -1;
438
        break;
439
 
440
      case 'm':
441
        if ((insn & 0x30) == 0x30)
442
          return -1;
443
        break;
444
 
445
      case 'S':
446
        /* A prefix operand without side-effect.  */
447
        if (prefix_insn != NO_CRIS_PREFIX && (insn & 0x400) == 0)
448
          {
449
            prefix_ok = 1;
450
            break;
451
          }
452
        else
453
          return -1;
454
 
455
      case 's':
456
      case 'y':
457
      case 'Y':
458
        /* If this is a prefixed insn with postincrement (side-effect),
459
           the prefix must not be DIP.  */
460
        if (prefix_insn != NO_CRIS_PREFIX)
461
          {
462
            if (insn & 0x400)
463
              {
464
                const struct cris_opcode *prefix_opcodep
465
                  = get_opcode_entry (prefix_insn, NO_CRIS_PREFIX, disdata);
466
 
467
                if (prefix_opcodep->match == DIP_OPCODE)
468
                  return -1;
469
              }
470
 
471
            prefix_ok = 1;
472
          }
473
        break;
474
 
475
      case 'B':
476
        /* If we don't fall through, then the prefix is ok.  */
477
        prefix_ok = 1;
478
 
479
        /* A "push" prefix.  Check for valid "push" size.
480
           In case of special register, it may be != 4.  */
481
        if (prefix_insn != NO_CRIS_PREFIX)
482
          {
483
            /* Match the prefix insn to BDAPQ.  */
484
            const struct cris_opcode *prefix_opcodep
485
              = get_opcode_entry (prefix_insn, NO_CRIS_PREFIX, disdata);
486
 
487
            if (prefix_opcodep->match == BDAP_QUICK_OPCODE)
488
              {
489
                int pushsize = (prefix_insn & 255);
490
 
491
                if (pushsize > 127)
492
                  pushsize -= 256;
493
 
494
                if (s[1] == 'P')
495
                  {
496
                    unsigned int spec_reg = (insn >> 12) & 15;
497
                    const struct cris_spec_reg *sregp
498
                      = spec_reg_info (spec_reg, disdata->distype);
499
 
500
                    /* For a special-register, the "prefix size" must
501
                       match the size of the register.  */
502
                    if (sregp && sregp->reg_size == (unsigned int) -pushsize)
503
                      break;
504
                  }
505
                else if (s[1] == 'R')
506
                  {
507
                    if ((insn & 0x30) == 0x20 && pushsize == -4)
508
                      break;
509
                  }
510
                /* FIXME:  Should abort here; next constraint letter
511
                   *must* be 'P' or 'R'.  */
512
              }
513
          }
514
        return -1;
515
 
516
      case 'D':
517
        retval = (((insn >> 12) & 15) == (insn & 15));
518
        if (!retval)
519
          return -1;
520
        else
521
          retval += 4;
522
        break;
523
 
524
      case 'P':
525
        {
526
          const struct cris_spec_reg *sregp
527
            = spec_reg_info ((insn >> 12) & 15, disdata->distype);
528
 
529
          /* Since we match four bits, we will give a value of 4-1 = 3
530
             in a match.  If there is a corresponding exact match of a
531
             special register in another pattern, it will get a value of
532
             4, which will be higher.  This should be correct in that an
533
             exact pattern would match better than a general pattern.
534
 
535
             Note that there is a reason for not returning zero; the
536
             pattern for "clear" is partly  matched in the bit-pattern
537
             (the two lower bits must be zero), while the bit-pattern
538
             for a move from a special register is matched in the
539
             register constraint.  */
540
 
541
          if (sregp != NULL)
542
            {
543
              retval += 3;
544
              break;
545
            }
546
          else
547
            return -1;
548
        }
549
      }
550
 
551
  if (prefix_insn != NO_CRIS_PREFIX && ! prefix_ok)
552
    return -1;
553
 
554
  return retval;
555
}
556
 
557
/* Format number as hex with a leading "0x" into outbuffer.  */
558
 
559
static char *
560
format_hex (unsigned long number,
561
            char *outbuffer,
562
            struct cris_disasm_data *disdata)
563
{
564
  /* Truncate negative numbers on >32-bit hosts.  */
565
  number &= 0xffffffff;
566
 
567
  sprintf (outbuffer, "0x%lx", number);
568
 
569
  /* Save this value for the "case" support.  */
570
  if (TRACE_CASE)
571
    last_immediate = number;
572
 
573
  return outbuffer + strlen (outbuffer);
574
}
575
 
576
/* Format number as decimal into outbuffer.  Parameter signedp says
577
   whether the number should be formatted as signed (!= 0) or
578
   unsigned (== 0).  */
579
 
580
static char *
581
format_dec (long number, char *outbuffer, int signedp)
582
{
583
  last_immediate = number;
584
  if (signedp)
585
    sprintf (outbuffer, "%ld", number);
586
  else
587
    sprintf (outbuffer, "%lu", (unsigned long) number);
588
 
589
  return outbuffer + strlen (outbuffer);
590
}
591
 
592
/* Format the name of the general register regno into outbuffer.  */
593
 
594
static char *
595
format_reg (struct cris_disasm_data *disdata,
596
            int regno,
597
            char *outbuffer_start,
598
            bfd_boolean with_reg_prefix)
599
{
600
  char *outbuffer = outbuffer_start;
601
 
602
  if (with_reg_prefix)
603
    *outbuffer++ = REGISTER_PREFIX_CHAR;
604
 
605
  switch (regno)
606
    {
607
    case 15:
608
      /* For v32, there is no context in which we output PC.  */
609
      if (disdata->distype == cris_dis_v32)
610
        strcpy (outbuffer, "acr");
611
      else
612
        strcpy (outbuffer, "pc");
613
      break;
614
 
615
    case 14:
616
      strcpy (outbuffer, "sp");
617
      break;
618
 
619
    default:
620
      sprintf (outbuffer, "r%d", regno);
621
      break;
622
    }
623
 
624
  return outbuffer_start + strlen (outbuffer_start);
625
}
626
 
627
/* Format the name of a support register into outbuffer.  */
628
 
629
static char *
630
format_sup_reg (unsigned int regno,
631
                char *outbuffer_start,
632
                bfd_boolean with_reg_prefix)
633
{
634
  char *outbuffer = outbuffer_start;
635
  int i;
636
 
637
  if (with_reg_prefix)
638
    *outbuffer++ = REGISTER_PREFIX_CHAR;
639
 
640
  for (i = 0; cris_support_regs[i].name != NULL; i++)
641
    if (cris_support_regs[i].number == regno)
642
      {
643
        sprintf (outbuffer, "%s", cris_support_regs[i].name);
644
        return outbuffer_start + strlen (outbuffer_start);
645
      }
646
 
647
  /* There's supposed to be register names covering all numbers, though
648
     some may be generic names.  */
649
  sprintf (outbuffer, "format_sup_reg-BUG");
650
  return outbuffer_start + strlen (outbuffer_start);
651
}
652
 
653
/* Return the length of an instruction.  */
654
 
655
static unsigned
656
bytes_to_skip (unsigned int insn,
657
               const struct cris_opcode *matchedp,
658
               enum cris_disass_family distype,
659
               const struct cris_opcode *prefix_matchedp)
660
{
661
  /* Each insn is a word plus "immediate" operands.  */
662
  unsigned to_skip = 2;
663
  const char *template_name = (const char *) matchedp->args;
664
  const char *s;
665
 
666
  for (s = template_name; *s; s++)
667
    if ((*s == 's' || *s == 'N' || *s == 'Y')
668
        && (insn & 0x400) && (insn & 15) == 15
669
        && prefix_matchedp == NULL)
670
      {
671
        /* Immediate via [pc+], so we have to check the size of the
672
           operand.  */
673
        int mode_size = 1 << ((insn >> 4) & (*template_name == 'z' ? 1 : 3));
674
 
675
        if (matchedp->imm_oprnd_size == SIZE_FIX_32)
676
          to_skip += 4;
677
        else if (matchedp->imm_oprnd_size == SIZE_SPEC_REG)
678
          {
679
            const struct cris_spec_reg *sregp
680
              = spec_reg_info ((insn >> 12) & 15, distype);
681
 
682
            /* FIXME: Improve error handling; should have been caught
683
               earlier.  */
684
            if (sregp == NULL)
685
              return 2;
686
 
687
            /* PC is incremented by two, not one, for a byte.  Except on
688
               CRISv32, where constants are always DWORD-size for
689
               special registers.  */
690
            to_skip +=
691
              distype == cris_dis_v32 ? 4 : (sregp->reg_size + 1) & ~1;
692
          }
693
        else
694
          to_skip += (mode_size + 1) & ~1;
695
      }
696
    else if (*s == 'n')
697
      to_skip += 4;
698
    else if (*s == 'b')
699
      to_skip += 2;
700
 
701
  return to_skip;
702
}
703
 
704
/* Print condition code flags.  */
705
 
706
static char *
707
print_flags (struct cris_disasm_data *disdata, unsigned int insn, char *cp)
708
{
709
  /* Use the v8 (Etrax 100) flag definitions for disassembly.
710
     The differences with v0 (Etrax 1..4) vs. Svinto are:
711
      v0 'd' <=> v8 'm'
712
      v0 'e' <=> v8 'b'.
713
     FIXME: Emit v0..v3 flag names somehow.  */
714
  static const char v8_fnames[] = "cvznxibm";
715
  static const char v32_fnames[] = "cvznxiup";
716
  const char *fnames
717
    = disdata->distype == cris_dis_v32 ? v32_fnames : v8_fnames;
718
 
719
  unsigned char flagbits = (((insn >> 8) & 0xf0) | (insn & 15));
720
  int i;
721
 
722
  for (i = 0; i < 8; i++)
723
    if (flagbits & (1 << i))
724
      *cp++ = fnames[i];
725
 
726
  return cp;
727
}
728
 
729
/* Print out an insn with its operands, and update the info->insn_type
730
   fields.  The prefix_opcodep and the rest hold a prefix insn that is
731
   supposed to be output as an address mode.  */
732
 
733
static void
734
print_with_operands (const struct cris_opcode *opcodep,
735
                     unsigned int insn,
736
                     unsigned char *buffer,
737
                     bfd_vma addr,
738
                     disassemble_info *info,
739
                     /* If a prefix insn was before this insn (and is supposed
740
                        to be output as an address), here is a description of
741
                        it.  */
742
                     const struct cris_opcode *prefix_opcodep,
743
                     unsigned int prefix_insn,
744
                     unsigned char *prefix_buffer,
745
                     bfd_boolean with_reg_prefix)
746
{
747
  /* Get a buffer of somewhat reasonable size where we store
748
     intermediate parts of the insn.  */
749
  char temp[sizeof (".d [$r13=$r12-2147483648],$r10") * 2];
750
  char *tp = temp;
751
  static const char mode_char[] = "bwd?";
752
  const char *s;
753
  const char *cs;
754
  struct cris_disasm_data *disdata
755
    = (struct cris_disasm_data *) info->private_data;
756
 
757
  /* Print out the name first thing we do.  */
758
  (*info->fprintf_func) (info->stream, "%s", opcodep->name);
759
 
760
  cs = opcodep->args;
761
  s = cs;
762
 
763
  /* Ignore any prefix indicator.  */
764
  if (*s == 'p')
765
    s++;
766
 
767
  if (*s == 'm' || *s == 'M' || *s == 'z')
768
    {
769
      *tp++ = '.';
770
 
771
      /* Get the size-letter.  */
772
      *tp++ = *s == 'M'
773
        ? (insn & 0x8000 ? 'd'
774
           : insn & 0x4000 ? 'w' : 'b')
775
        : mode_char[(insn >> 4) & (*s == 'z' ? 1 : 3)];
776
 
777
      /* Ignore the size and the space character that follows.  */
778
      s += 2;
779
    }
780
 
781
  /* Add a space if this isn't a long-branch, because for those will add
782
     the condition part of the name later.  */
783
  if (opcodep->match != (BRANCH_PC_LOW + BRANCH_INCR_HIGH * 256))
784
    *tp++ = ' ';
785
 
786
  /* Fill in the insn-type if deducible from the name (and there's no
787
     better way).  */
788
  if (opcodep->name[0] == 'j')
789
    {
790
      if (CONST_STRNEQ (opcodep->name, "jsr"))
791
        /* It's "jsr" or "jsrc".  */
792
        info->insn_type = dis_jsr;
793
      else
794
        /* Any other jump-type insn is considered a branch.  */
795
        info->insn_type = dis_branch;
796
    }
797
 
798
  /* We might know some more fields right now.  */
799
  info->branch_delay_insns = opcodep->delayed;
800
 
801
  /* Handle operands.  */
802
  for (; *s; s++)
803
    {
804
    switch (*s)
805
      {
806
      case 'T':
807
        tp = format_sup_reg ((insn >> 12) & 15, tp, with_reg_prefix);
808
        break;
809
 
810
      case 'A':
811
        if (with_reg_prefix)
812
          *tp++ = REGISTER_PREFIX_CHAR;
813
        *tp++ = 'a';
814
        *tp++ = 'c';
815
        *tp++ = 'r';
816
        break;
817
 
818
      case '[':
819
      case ']':
820
      case ',':
821
        *tp++ = *s;
822
        break;
823
 
824
      case '!':
825
        /* Ignore at this point; used at earlier stages to avoid
826
           recognition if there's a prefix at something that in other
827
           ways looks like a "pop".  */
828
        break;
829
 
830
      case 'd':
831
        /* Ignore.  This is an optional ".d " on the large one of
832
           relaxable insns.  */
833
        break;
834
 
835
      case 'B':
836
        /* This was the prefix that made this a "push".  We've already
837
           handled it by recognizing it, so signal that the prefix is
838
           handled by setting it to NULL.  */
839
        prefix_opcodep = NULL;
840
        break;
841
 
842
      case 'D':
843
      case 'r':
844
        tp = format_reg (disdata, insn & 15, tp, with_reg_prefix);
845
        break;
846
 
847
      case 'R':
848
        tp = format_reg (disdata, (insn >> 12) & 15, tp, with_reg_prefix);
849
        break;
850
 
851
      case 'n':
852
        {
853
          /* Like N but pc-relative to the start of the insn.  */
854
          unsigned long number
855
            = (buffer[2] + buffer[3] * 256 + buffer[4] * 65536
856
               + buffer[5] * 0x1000000 + addr);
857
 
858
          /* Finish off and output previous formatted bytes.  */
859
          *tp = 0;
860
          if (temp[0])
861
            (*info->fprintf_func) (info->stream, "%s", temp);
862
          tp = temp;
863
 
864
          (*info->print_address_func) ((bfd_vma) number, info);
865
        }
866
        break;
867
 
868
      case 'u':
869
        {
870
          /* Like n but the offset is bits <3:0> in the instruction.  */
871
          unsigned long number = (buffer[0] & 0xf) * 2 + addr;
872
 
873
          /* Finish off and output previous formatted bytes.  */
874
          *tp = 0;
875
          if (temp[0])
876
            (*info->fprintf_func) (info->stream, "%s", temp);
877
          tp = temp;
878
 
879
          (*info->print_address_func) ((bfd_vma) number, info);
880
        }
881
        break;
882
 
883
      case 'N':
884
      case 'y':
885
      case 'Y':
886
      case 'S':
887
      case 's':
888
        /* Any "normal" memory operand.  */
889
        if ((insn & 0x400) && (insn & 15) == 15 && prefix_opcodep == NULL)
890
          {
891
            /* We're looking at [pc+], i.e. we need to output an immediate
892
               number, where the size can depend on different things.  */
893
            long number;
894
            int signedp
895
              = ((*cs == 'z' && (insn & 0x20))
896
                 || opcodep->match == BDAP_QUICK_OPCODE);
897
            int nbytes;
898
 
899
            if (opcodep->imm_oprnd_size == SIZE_FIX_32)
900
              nbytes = 4;
901
            else if (opcodep->imm_oprnd_size == SIZE_SPEC_REG)
902
              {
903
                const struct cris_spec_reg *sregp
904
                  = spec_reg_info ((insn >> 12) & 15, disdata->distype);
905
 
906
                /* A NULL return should have been as a non-match earlier,
907
                   so catch it as an internal error in the error-case
908
                   below.  */
909
                if (sregp == NULL)
910
                  /* Whatever non-valid size.  */
911
                  nbytes = 42;
912
                else
913
                  /* PC is always incremented by a multiple of two.
914
                     For CRISv32, immediates are always 4 bytes for
915
                     special registers.  */
916
                  nbytes = disdata->distype == cris_dis_v32
917
                    ? 4 : (sregp->reg_size + 1) & ~1;
918
              }
919
            else
920
              {
921
                int mode_size = 1 << ((insn >> 4) & (*cs == 'z' ? 1 : 3));
922
 
923
                if (mode_size == 1)
924
                  nbytes = 2;
925
                else
926
                  nbytes = mode_size;
927
              }
928
 
929
            switch (nbytes)
930
              {
931
              case 1:
932
                number = buffer[2];
933
                if (signedp && number > 127)
934
                  number -= 256;
935
                break;
936
 
937
              case 2:
938
                number = buffer[2] + buffer[3] * 256;
939
                if (signedp && number > 32767)
940
                  number -= 65536;
941
                break;
942
 
943
              case 4:
944
                number
945
                  = buffer[2] + buffer[3] * 256 + buffer[4] * 65536
946
                  + buffer[5] * 0x1000000;
947
                break;
948
 
949
              default:
950
                strcpy (tp, "bug");
951
                tp += 3;
952
                number = 42;
953
              }
954
 
955
            if ((*cs == 'z' && (insn & 0x20))
956
                || (opcodep->match == BDAP_QUICK_OPCODE
957
                    && (nbytes <= 2 || buffer[1 + nbytes] == 0)))
958
              tp = format_dec (number, tp, signedp);
959
            else
960
              {
961
                unsigned int highbyte = (number >> 24) & 0xff;
962
 
963
                /* Either output this as an address or as a number.  If it's
964
                   a dword with the same high-byte as the address of the
965
                   insn, assume it's an address, and also if it's a non-zero
966
                   non-0xff high-byte.  If this is a jsr or a jump, then
967
                   it's definitely an address.  */
968
                if (nbytes == 4
969
                    && (highbyte == ((addr >> 24) & 0xff)
970
                        || (highbyte != 0 && highbyte != 0xff)
971
                        || info->insn_type == dis_branch
972
                        || info->insn_type == dis_jsr))
973
                  {
974
                    /* Finish off and output previous formatted bytes.  */
975
                    *tp = 0;
976
                    tp = temp;
977
                    if (temp[0])
978
                      (*info->fprintf_func) (info->stream, "%s", temp);
979
 
980
                    (*info->print_address_func) ((bfd_vma) number, info);
981
 
982
                    info->target = number;
983
                  }
984
                else
985
                  tp = format_hex (number, tp, disdata);
986
              }
987
          }
988
        else
989
          {
990
            /* Not an immediate number.  Then this is a (possibly
991
               prefixed) memory operand.  */
992
            if (info->insn_type != dis_nonbranch)
993
              {
994
                int mode_size
995
                  = 1 << ((insn >> 4)
996
                          & (opcodep->args[0] == 'z' ? 1 : 3));
997
                int size;
998
                info->insn_type = dis_dref;
999
                info->flags |= CRIS_DIS_FLAG_MEMREF;
1000
 
1001
                if (opcodep->imm_oprnd_size == SIZE_FIX_32)
1002
                  size = 4;
1003
                else if (opcodep->imm_oprnd_size == SIZE_SPEC_REG)
1004
                  {
1005
                    const struct cris_spec_reg *sregp
1006
                      = spec_reg_info ((insn >> 12) & 15, disdata->distype);
1007
 
1008
                    /* FIXME: Improve error handling; should have been caught
1009
                       earlier.  */
1010
                    if (sregp == NULL)
1011
                      size = 4;
1012
                    else
1013
                      size = sregp->reg_size;
1014
                  }
1015
                else
1016
                  size = mode_size;
1017
 
1018
                info->data_size = size;
1019
              }
1020
 
1021
            *tp++ = '[';
1022
 
1023
            if (prefix_opcodep
1024
                /* We don't match dip with a postincremented field
1025
                   as a side-effect address mode.  */
1026
                && ((insn & 0x400) == 0
1027
                    || prefix_opcodep->match != DIP_OPCODE))
1028
              {
1029
                if (insn & 0x400)
1030
                  {
1031
                    tp = format_reg (disdata, insn & 15, tp, with_reg_prefix);
1032
                    *tp++ = '=';
1033
                  }
1034
 
1035
 
1036
                /* We mainly ignore the prefix format string when the
1037
                   address-mode syntax is output.  */
1038
                switch (prefix_opcodep->match)
1039
                  {
1040
                  case DIP_OPCODE:
1041
                    /* It's [r], [r+] or [pc+].  */
1042
                    if ((prefix_insn & 0x400) && (prefix_insn & 15) == 15)
1043
                      {
1044
                        /* It's [pc+].  This cannot possibly be anything
1045
                           but an address.  */
1046
                        unsigned long number
1047
                          = prefix_buffer[2] + prefix_buffer[3] * 256
1048
                          + prefix_buffer[4] * 65536
1049
                          + prefix_buffer[5] * 0x1000000;
1050
 
1051
                        info->target = (bfd_vma) number;
1052
 
1053
                        /* Finish off and output previous formatted
1054
                           data.  */
1055
                        *tp = 0;
1056
                        tp = temp;
1057
                        if (temp[0])
1058
                          (*info->fprintf_func) (info->stream, "%s", temp);
1059
 
1060
                        (*info->print_address_func) ((bfd_vma) number, info);
1061
                      }
1062
                    else
1063
                      {
1064
                        /* For a memref in an address, we use target2.
1065
                           In this case, target is zero.  */
1066
                        info->flags
1067
                          |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG
1068
                              | CRIS_DIS_FLAG_MEM_TARGET2_MEM);
1069
 
1070
                        info->target2 = prefix_insn & 15;
1071
 
1072
                        *tp++ = '[';
1073
                        tp = format_reg (disdata, prefix_insn & 15, tp,
1074
                                         with_reg_prefix);
1075
                        if (prefix_insn & 0x400)
1076
                          *tp++ = '+';
1077
                        *tp++ = ']';
1078
                      }
1079
                    break;
1080
 
1081
                  case BDAP_QUICK_OPCODE:
1082
                    {
1083
                      int number;
1084
 
1085
                      number = prefix_buffer[0];
1086
                      if (number > 127)
1087
                        number -= 256;
1088
 
1089
                      /* Output "reg+num" or, if num < 0, "reg-num".  */
1090
                      tp = format_reg (disdata, (prefix_insn >> 12) & 15, tp,
1091
                                       with_reg_prefix);
1092
                      if (number >= 0)
1093
                        *tp++ = '+';
1094
                      tp = format_dec (number, tp, 1);
1095
 
1096
                      info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG;
1097
                      info->target = (prefix_insn >> 12) & 15;
1098
                      info->target2 = (bfd_vma) number;
1099
                      break;
1100
                    }
1101
 
1102
                  case BIAP_OPCODE:
1103
                    /* Output "r+R.m".  */
1104
                    tp = format_reg (disdata, prefix_insn & 15, tp,
1105
                                     with_reg_prefix);
1106
                    *tp++ = '+';
1107
                    tp = format_reg (disdata, (prefix_insn >> 12) & 15, tp,
1108
                                     with_reg_prefix);
1109
                    *tp++ = '.';
1110
                    *tp++ = mode_char[(prefix_insn >> 4) & 3];
1111
 
1112
                    info->flags
1113
                      |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG
1114
                          | CRIS_DIS_FLAG_MEM_TARGET_IS_REG
1115
 
1116
                          | ((prefix_insn & 0x8000)
1117
                             ? CRIS_DIS_FLAG_MEM_TARGET2_MULT4
1118
                             : ((prefix_insn & 0x8000)
1119
                                ? CRIS_DIS_FLAG_MEM_TARGET2_MULT2 : 0)));
1120
 
1121
                    /* Is it the casejump?  It's a "adds.w [pc+r%d.w],pc".  */
1122
                    if (insn == 0xf83f && (prefix_insn & ~0xf000) == 0x55f)
1123
                      /* Then start interpreting data as offsets.  */
1124
                      case_offset_counter = no_of_case_offsets;
1125
                    break;
1126
 
1127
                  case BDAP_INDIR_OPCODE:
1128
                    /* Output "r+s.m", or, if "s" is [pc+], "r+s" or
1129
                       "r-s".  */
1130
                    tp = format_reg (disdata, (prefix_insn >> 12) & 15, tp,
1131
                                     with_reg_prefix);
1132
 
1133
                    if ((prefix_insn & 0x400) && (prefix_insn & 15) == 15)
1134
                      {
1135
                        long number;
1136
                        unsigned int nbytes;
1137
 
1138
                        /* It's a value.  Get its size.  */
1139
                        int mode_size = 1 << ((prefix_insn >> 4) & 3);
1140
 
1141
                        if (mode_size == 1)
1142
                          nbytes = 2;
1143
                        else
1144
                          nbytes = mode_size;
1145
 
1146
                        switch (nbytes)
1147
                          {
1148
                          case 1:
1149
                            number = prefix_buffer[2];
1150
                            if (number > 127)
1151
                              number -= 256;
1152
                            break;
1153
 
1154
                          case 2:
1155
                            number = prefix_buffer[2] + prefix_buffer[3] * 256;
1156
                            if (number > 32767)
1157
                              number -= 65536;
1158
                            break;
1159
 
1160
                          case 4:
1161
                            number
1162
                              = prefix_buffer[2] + prefix_buffer[3] * 256
1163
                              + prefix_buffer[4] * 65536
1164
                              + prefix_buffer[5] * 0x1000000;
1165
                            break;
1166
 
1167
                          default:
1168
                            strcpy (tp, "bug");
1169
                            tp += 3;
1170
                            number = 42;
1171
                          }
1172
 
1173
                        info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG;
1174
                        info->target2 = (bfd_vma) number;
1175
 
1176
                        /* If the size is dword, then assume it's an
1177
                           address.  */
1178
                        if (nbytes == 4)
1179
                          {
1180
                            /* Finish off and output previous formatted
1181
                               bytes.  */
1182
                            *tp++ = '+';
1183
                            *tp = 0;
1184
                            tp = temp;
1185
                            (*info->fprintf_func) (info->stream, "%s", temp);
1186
 
1187
                            (*info->print_address_func) ((bfd_vma) number, info);
1188
                          }
1189
                        else
1190
                          {
1191
                            if (number >= 0)
1192
                              *tp++ = '+';
1193
                            tp = format_dec (number, tp, 1);
1194
                          }
1195
                      }
1196
                    else
1197
                      {
1198
                        /* Output "r+[R].m" or "r+[R+].m".  */
1199
                        *tp++ = '+';
1200
                        *tp++ = '[';
1201
                        tp = format_reg (disdata, prefix_insn & 15, tp,
1202
                                         with_reg_prefix);
1203
                        if (prefix_insn & 0x400)
1204
                          *tp++ = '+';
1205
                        *tp++ = ']';
1206
                        *tp++ = '.';
1207
                        *tp++ = mode_char[(prefix_insn >> 4) & 3];
1208
 
1209
                        info->flags
1210
                          |= (CRIS_DIS_FLAG_MEM_TARGET2_IS_REG
1211
                              | CRIS_DIS_FLAG_MEM_TARGET2_MEM
1212
                              | CRIS_DIS_FLAG_MEM_TARGET_IS_REG
1213
 
1214
                              | (((prefix_insn >> 4) == 2)
1215
                                 ? 0
1216
                                 : (((prefix_insn >> 4) & 3) == 1
1217
                                    ? CRIS_DIS_FLAG_MEM_TARGET2_MEM_WORD
1218
                                    : CRIS_DIS_FLAG_MEM_TARGET2_MEM_BYTE)));
1219
                      }
1220
                    break;
1221
 
1222
                  default:
1223
                    (*info->fprintf_func) (info->stream, "?prefix-bug");
1224
                  }
1225
 
1226
                /* To mark that the prefix is used, reset it.  */
1227
                prefix_opcodep = NULL;
1228
              }
1229
            else
1230
              {
1231
                tp = format_reg (disdata, insn & 15, tp, with_reg_prefix);
1232
 
1233
                info->flags |= CRIS_DIS_FLAG_MEM_TARGET_IS_REG;
1234
                info->target = insn & 15;
1235
 
1236
                if (insn & 0x400)
1237
                  *tp++ = '+';
1238
              }
1239
            *tp++ = ']';
1240
          }
1241
        break;
1242
 
1243
      case 'x':
1244
        tp = format_reg (disdata, (insn >> 12) & 15, tp, with_reg_prefix);
1245
        *tp++ = '.';
1246
        *tp++ = mode_char[(insn >> 4) & 3];
1247
        break;
1248
 
1249
      case 'I':
1250
        tp = format_dec (insn & 63, tp, 0);
1251
        break;
1252
 
1253
      case 'b':
1254
        {
1255
          int where = buffer[2] + buffer[3] * 256;
1256
 
1257
          if (where > 32767)
1258
            where -= 65536;
1259
 
1260
          where += addr + ((disdata->distype == cris_dis_v32) ? 0 : 4);
1261
 
1262
          if (insn == BA_PC_INCR_OPCODE)
1263
            info->insn_type = dis_branch;
1264
          else
1265
            info->insn_type = dis_condbranch;
1266
 
1267
          info->target = (bfd_vma) where;
1268
 
1269
          *tp = 0;
1270
          tp = temp;
1271
          (*info->fprintf_func) (info->stream, "%s%s ",
1272
                                 temp, cris_cc_strings[insn >> 12]);
1273
 
1274
          (*info->print_address_func) ((bfd_vma) where, info);
1275
        }
1276
      break;
1277
 
1278
    case 'c':
1279
      tp = format_dec (insn & 31, tp, 0);
1280
      break;
1281
 
1282
    case 'C':
1283
      tp = format_dec (insn & 15, tp, 0);
1284
      break;
1285
 
1286
    case 'o':
1287
      {
1288
        long offset = insn & 0xfe;
1289
        bfd_vma target;
1290
 
1291
        if (insn & 1)
1292
          offset |= ~0xff;
1293
 
1294
        if (opcodep->match == BA_QUICK_OPCODE)
1295
          info->insn_type = dis_branch;
1296
        else
1297
          info->insn_type = dis_condbranch;
1298
 
1299
        target = addr + ((disdata->distype == cris_dis_v32) ? 0 : 2) + offset;
1300
        info->target = target;
1301
        *tp = 0;
1302
        tp = temp;
1303
        (*info->fprintf_func) (info->stream, "%s", temp);
1304
        (*info->print_address_func) (target, info);
1305
      }
1306
      break;
1307
 
1308
    case 'Q':
1309
    case 'O':
1310
      {
1311
        long number = buffer[0];
1312
 
1313
        if (number > 127)
1314
          number = number - 256;
1315
 
1316
        tp = format_dec (number, tp, 1);
1317
        *tp++ = ',';
1318
        tp = format_reg (disdata, (insn >> 12) & 15, tp, with_reg_prefix);
1319
      }
1320
      break;
1321
 
1322
    case 'f':
1323
      tp = print_flags (disdata, insn, tp);
1324
      break;
1325
 
1326
    case 'i':
1327
      tp = format_dec ((insn & 32) ? (insn & 31) | ~31L : insn & 31, tp, 1);
1328
      break;
1329
 
1330
    case 'P':
1331
      {
1332
        const struct cris_spec_reg *sregp
1333
          = spec_reg_info ((insn >> 12) & 15, disdata->distype);
1334
 
1335
        if (sregp->name == NULL)
1336
          /* Should have been caught as a non-match eariler.  */
1337
          *tp++ = '?';
1338
        else
1339
          {
1340
            if (with_reg_prefix)
1341
              *tp++ = REGISTER_PREFIX_CHAR;
1342
            strcpy (tp, sregp->name);
1343
            tp += strlen (tp);
1344
          }
1345
      }
1346
      break;
1347
 
1348
    default:
1349
      strcpy (tp, "???");
1350
      tp += 3;
1351
    }
1352
  }
1353
 
1354
  *tp = 0;
1355
 
1356
  if (prefix_opcodep)
1357
    (*info->fprintf_func) (info->stream, " (OOPS unused prefix \"%s: %s\")",
1358
                           prefix_opcodep->name, prefix_opcodep->args);
1359
 
1360
  (*info->fprintf_func) (info->stream, "%s", temp);
1361
 
1362
  /* Get info for matching case-tables, if we don't have any active.
1363
     We assume that the last constant seen is used; either in the insn
1364
     itself or in a "move.d const,rN, sub.d rN,rM"-like sequence.  */
1365
  if (TRACE_CASE && case_offset_counter == 0)
1366
    {
1367
      if (CONST_STRNEQ (opcodep->name, "sub"))
1368
        case_offset = last_immediate;
1369
 
1370
      /* It could also be an "add", if there are negative case-values.  */
1371
      else if (CONST_STRNEQ (opcodep->name, "add"))
1372
        /* The first case is the negated operand to the add.  */
1373
        case_offset = -last_immediate;
1374
 
1375
      /* A bound insn will tell us the number of cases.  */
1376
      else if (CONST_STRNEQ (opcodep->name, "bound"))
1377
        no_of_case_offsets = last_immediate + 1;
1378
 
1379
      /* A jump or jsr or branch breaks the chain of insns for a
1380
         case-table, so assume default first-case again.  */
1381
      else if (info->insn_type == dis_jsr
1382
               || info->insn_type == dis_branch
1383
               || info->insn_type == dis_condbranch)
1384
        case_offset = 0;
1385
    }
1386
}
1387
 
1388
 
1389
/* Print the CRIS instruction at address memaddr on stream.  Returns
1390
   length of the instruction, in bytes.  Prefix register names with `$' if
1391
   WITH_REG_PREFIX.  */
1392
 
1393
static int
1394
print_insn_cris_generic (bfd_vma memaddr,
1395
                         disassemble_info *info,
1396
                         bfd_boolean with_reg_prefix)
1397
{
1398
  int nbytes;
1399
  unsigned int insn;
1400
  const struct cris_opcode *matchedp;
1401
  int advance = 0;
1402
  struct cris_disasm_data *disdata
1403
    = (struct cris_disasm_data *) info->private_data;
1404
 
1405
  /* No instruction will be disassembled as longer than this number of
1406
     bytes; stacked prefixes will not be expanded.  */
1407
  unsigned char buffer[MAX_BYTES_PER_CRIS_INSN];
1408
  unsigned char *bufp;
1409
  int status = 0;
1410
  bfd_vma addr;
1411
 
1412
  /* There will be an "out of range" error after the last instruction.
1413
     Reading pairs of bytes in decreasing number, we hope that we will get
1414
     at least the amount that we will consume.
1415
 
1416
     If we can't get any data, or we do not get enough data, we print
1417
     the error message.  */
1418
 
1419
  for (nbytes = MAX_BYTES_PER_CRIS_INSN; nbytes > 0; nbytes -= 2)
1420
    {
1421
      status = (*info->read_memory_func) (memaddr, buffer, nbytes, info);
1422
      if (status == 0)
1423
        break;
1424
    }
1425
 
1426
  /* If we did not get all we asked for, then clear the rest.
1427
     Hopefully this makes a reproducible result in case of errors.  */
1428
  if (nbytes != MAX_BYTES_PER_CRIS_INSN)
1429
    memset (buffer + nbytes, 0, MAX_BYTES_PER_CRIS_INSN - nbytes);
1430
 
1431
  addr = memaddr;
1432
  bufp = buffer;
1433
 
1434
  /* Set some defaults for the insn info.  */
1435
  info->insn_info_valid = 1;
1436
  info->branch_delay_insns = 0;
1437
  info->data_size = 0;
1438
  info->insn_type = dis_nonbranch;
1439
  info->flags = 0;
1440
  info->target = 0;
1441
  info->target2 = 0;
1442
 
1443
  /* If we got any data, disassemble it.  */
1444
  if (nbytes != 0)
1445
    {
1446
      matchedp = NULL;
1447
 
1448
      insn = bufp[0] + bufp[1] * 256;
1449
 
1450
      /* If we're in a case-table, don't disassemble the offsets.  */
1451
      if (TRACE_CASE && case_offset_counter != 0)
1452
        {
1453
          info->insn_type = dis_noninsn;
1454
          advance += 2;
1455
 
1456
          /* If to print data as offsets, then shortcut here.  */
1457
          (*info->fprintf_func) (info->stream, "case %ld%s: -> ",
1458
                                 case_offset + no_of_case_offsets
1459
                                 - case_offset_counter,
1460
                                 case_offset_counter == 1 ? "/default" :
1461
                                 "");
1462
 
1463
          (*info->print_address_func) ((bfd_vma)
1464
                                       ((short) (insn)
1465
                                        + (long) (addr
1466
                                                  - (no_of_case_offsets
1467
                                                     - case_offset_counter)
1468
                                                  * 2)), info);
1469
          case_offset_counter--;
1470
 
1471
          /* The default case start (without a "sub" or "add") must be
1472
             zero.  */
1473
          if (case_offset_counter == 0)
1474
            case_offset = 0;
1475
        }
1476
      else if (insn == 0)
1477
        {
1478
          /* We're often called to disassemble zeroes.  While this is a
1479
             valid "bcc .+2" insn, it is also useless enough and enough
1480
             of a nuiscance that we will just output "bcc .+2" for it
1481
             and signal it as a noninsn.  */
1482
          (*info->fprintf_func) (info->stream,
1483
                                 disdata->distype == cris_dis_v32
1484
                                 ? "bcc ." : "bcc .+2");
1485
          info->insn_type = dis_noninsn;
1486
          advance += 2;
1487
        }
1488
      else
1489
        {
1490
          const struct cris_opcode *prefix_opcodep = NULL;
1491
          unsigned char *prefix_buffer = bufp;
1492
          unsigned int prefix_insn = insn;
1493
          int prefix_size = 0;
1494
 
1495
          matchedp = get_opcode_entry (insn, NO_CRIS_PREFIX, disdata);
1496
 
1497
          /* Check if we're supposed to write out prefixes as address
1498
             modes and if this was a prefix.  */
1499
          if (matchedp != NULL && PARSE_PREFIX && matchedp->args[0] == 'p')
1500
            {
1501
              /* If it's a prefix, put it into the prefix vars and get the
1502
                 main insn.  */
1503
              prefix_size = bytes_to_skip (prefix_insn, matchedp,
1504
                                           disdata->distype, NULL);
1505
              prefix_opcodep = matchedp;
1506
 
1507
              insn = bufp[prefix_size] + bufp[prefix_size + 1] * 256;
1508
              matchedp = get_opcode_entry (insn, prefix_insn, disdata);
1509
 
1510
              if (matchedp != NULL)
1511
                {
1512
                  addr += prefix_size;
1513
                  bufp += prefix_size;
1514
                  advance += prefix_size;
1515
                }
1516
              else
1517
                {
1518
                  /* The "main" insn wasn't valid, at least not when
1519
                     prefixed.  Put back things enough to output the
1520
                     prefix insn only, as a normal insn.  */
1521
                  matchedp = prefix_opcodep;
1522
                  insn = prefix_insn;
1523
                  prefix_opcodep = NULL;
1524
                }
1525
            }
1526
 
1527
          if (matchedp == NULL)
1528
            {
1529
              (*info->fprintf_func) (info->stream, "??0x%x", insn);
1530
              advance += 2;
1531
 
1532
              info->insn_type = dis_noninsn;
1533
            }
1534
          else
1535
            {
1536
              advance
1537
                += bytes_to_skip (insn, matchedp, disdata->distype,
1538
                                  prefix_opcodep);
1539
 
1540
              /* The info_type and assorted fields will be set according
1541
                 to the operands.   */
1542
              print_with_operands (matchedp, insn, bufp, addr, info,
1543
                                   prefix_opcodep, prefix_insn,
1544
                                   prefix_buffer, with_reg_prefix);
1545
            }
1546
        }
1547
    }
1548
  else
1549
    info->insn_type = dis_noninsn;
1550
 
1551
  /* If we read less than MAX_BYTES_PER_CRIS_INSN, i.e. we got an error
1552
     status when reading that much, and the insn decoding indicated a
1553
     length exceeding what we read, there is an error.  */
1554
  if (status != 0 && (nbytes == 0 || advance > nbytes))
1555
    {
1556
      (*info->memory_error_func) (status, memaddr, info);
1557
      return -1;
1558
    }
1559
 
1560
  /* Max supported insn size with one folded prefix insn.  */
1561
  info->bytes_per_line = MAX_BYTES_PER_CRIS_INSN;
1562
 
1563
  /* I would like to set this to a fixed value larger than the actual
1564
     number of bytes to print in order to avoid spaces between bytes,
1565
     but objdump.c (2.9.1) does not like that, so we print 16-bit
1566
     chunks, which is the next choice.  */
1567
  info->bytes_per_chunk = 2;
1568
 
1569
  /* Printing bytes in order of increasing addresses makes sense,
1570
     especially on a little-endian target.
1571
     This is completely the opposite of what you think; setting this to
1572
     BFD_ENDIAN_LITTLE will print bytes in order N..0 rather than the 0..N
1573
     we want.  */
1574
  info->display_endian = BFD_ENDIAN_BIG;
1575
 
1576
  return advance;
1577
}
1578
 
1579
/* Disassemble, prefixing register names with `$'.  CRIS v0..v10.  */
1580
 
1581
static int
1582
print_insn_cris_with_register_prefix (bfd_vma vma,
1583
                                      disassemble_info *info)
1584
{
1585
  if (info->private_data == NULL
1586
      && !cris_parse_disassembler_options (info, cris_dis_v0_v10))
1587
    return -1;
1588
  return print_insn_cris_generic (vma, info, TRUE);
1589
}
1590
 
1591
/* Disassemble, prefixing register names with `$'.  CRIS v32.  */
1592
 
1593
static int
1594
print_insn_crisv32_with_register_prefix (bfd_vma vma,
1595
                                         disassemble_info *info)
1596
{
1597
  if (info->private_data == NULL
1598
      && !cris_parse_disassembler_options (info, cris_dis_v32))
1599
    return -1;
1600
  return print_insn_cris_generic (vma, info, TRUE);
1601
}
1602
 
1603
/* Disassemble, prefixing register names with `$'.
1604
   Common v10 and v32 subset.  */
1605
 
1606
static int
1607
print_insn_crisv10_v32_with_register_prefix (bfd_vma vma,
1608
                                             disassemble_info *info)
1609
{
1610
  if (info->private_data == NULL
1611
      && !cris_parse_disassembler_options (info, cris_dis_common_v10_v32))
1612
    return -1;
1613
  return print_insn_cris_generic (vma, info, TRUE);
1614
}
1615
 
1616
/* Disassemble, no prefixes on register names.  CRIS v0..v10.  */
1617
 
1618
static int
1619
print_insn_cris_without_register_prefix (bfd_vma vma,
1620
                                         disassemble_info *info)
1621
{
1622
  if (info->private_data == NULL
1623
      && !cris_parse_disassembler_options (info, cris_dis_v0_v10))
1624
    return -1;
1625
  return print_insn_cris_generic (vma, info, FALSE);
1626
}
1627
 
1628
/* Disassemble, no prefixes on register names.  CRIS v32.  */
1629
 
1630
static int
1631
print_insn_crisv32_without_register_prefix (bfd_vma vma,
1632
                                            disassemble_info *info)
1633
{
1634
  if (info->private_data == NULL
1635
      && !cris_parse_disassembler_options (info, cris_dis_v32))
1636
    return -1;
1637
  return print_insn_cris_generic (vma, info, FALSE);
1638
}
1639
 
1640
/* Disassemble, no prefixes on register names.
1641
   Common v10 and v32 subset.  */
1642
 
1643
static int
1644
print_insn_crisv10_v32_without_register_prefix (bfd_vma vma,
1645
                                                disassemble_info *info)
1646
{
1647
  if (info->private_data == NULL
1648
      && !cris_parse_disassembler_options (info, cris_dis_common_v10_v32))
1649
    return -1;
1650
  return print_insn_cris_generic (vma, info, FALSE);
1651
}
1652
 
1653
/* Return a disassembler-function that prints registers with a `$' prefix,
1654
   or one that prints registers without a prefix.
1655
   FIXME: We should improve the solution to avoid the multitude of
1656
   functions seen above.  */
1657
 
1658
disassembler_ftype
1659
cris_get_disassembler (bfd *abfd)
1660
{
1661
  /* If there's no bfd in sight, we return what is valid as input in all
1662
     contexts if fed back to the assembler: disassembly *with* register
1663
     prefix.  Unfortunately this will be totally wrong for v32.  */
1664
  if (abfd == NULL)
1665
    return print_insn_cris_with_register_prefix;
1666
 
1667
  if (bfd_get_symbol_leading_char (abfd) == 0)
1668
    {
1669
      if (bfd_get_mach (abfd) == bfd_mach_cris_v32)
1670
        return print_insn_crisv32_with_register_prefix;
1671
      if (bfd_get_mach (abfd) == bfd_mach_cris_v10_v32)
1672
        return print_insn_crisv10_v32_with_register_prefix;
1673
 
1674
      /* We default to v10.  This may be specifically specified in the
1675
         bfd mach, but is also the default setting.  */
1676
      return print_insn_cris_with_register_prefix;
1677
    }
1678
 
1679
  if (bfd_get_mach (abfd) == bfd_mach_cris_v32)
1680
    return print_insn_crisv32_without_register_prefix;
1681
  if (bfd_get_mach (abfd) == bfd_mach_cris_v10_v32)
1682
    return print_insn_crisv10_v32_without_register_prefix;
1683
  return print_insn_cris_without_register_prefix;
1684
}
1685
 
1686
/* Local variables:
1687
   eval: (c-set-style "gnu")
1688
   indent-tabs-mode: t
1689
   End:  */

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