aboutsummaryrefslogtreecommitdiff
path: root/opcodes/xstormy16-dis.c
blob: aaff53f863d87054d5c81752b93105e5b3ed44aa (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
/* Disassembler interface for targets using CGEN. -*- C -*-
   CGEN: Cpu tools GENerator

   THIS FILE IS MACHINE GENERATED WITH CGEN.
   - the resultant file is machine generated, cgen-dis.in isn't

   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
   Free Software Foundation, Inc.

   This file is part of the GNU Binutils and 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.,
   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

/* ??? Eventually more and more of this stuff can go to cpu-independent files.
   Keep that in mind.  */

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "dis-asm.h"
#include "bfd.h"
#include "symcat.h"
#include "libiberty.h"
#include "xstormy16-desc.h"
#include "xstormy16-opc.h"
#include "opintl.h"

/* Default text to print if an instruction isn't recognized.  */
#define UNKNOWN_INSN_MSG _("*unknown*")

static void print_normal
  (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
static void print_address
  (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
static void print_keyword
  (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
static void print_insn_normal
  (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
static int print_insn
  (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
static int default_print_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
static int read_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
   unsigned long *);

/* -- disassembler routines inserted here.  */


void xstormy16_cgen_print_operand
  (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);

/* Main entry point for printing operands.
   XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
   of dis-asm.h on cgen.h.

   This function is basically just a big switch statement.  Earlier versions
   used tables to look up the function to use, but
   - if the table contains both assembler and disassembler functions then
     the disassembler contains much of the assembler and vice-versa,
   - there's a lot of inlining possibilities as things grow,
   - using a switch statement avoids the function call overhead.

   This function could be moved into `print_insn_normal', but keeping it
   separate makes clear the interface between `print_insn_normal' and each of
   the handlers.  */

void
xstormy16_cgen_print_operand (CGEN_CPU_DESC cd,
			   int opindex,
			   void * xinfo,
			   CGEN_FIELDS *fields,
			   void const *attrs ATTRIBUTE_UNUSED,
			   bfd_vma pc,
			   int length)
{
  disassemble_info *info = (disassemble_info *) xinfo;

  switch (opindex)
    {
    case XSTORMY16_OPERAND_RB :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_Rb_names, fields->f_Rb, 0);
      break;
    case XSTORMY16_OPERAND_RBJ :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_Rb_names, fields->f_Rbj, 0);
      break;
    case XSTORMY16_OPERAND_RD :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rd, 0);
      break;
    case XSTORMY16_OPERAND_RDM :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rdm, 0);
      break;
    case XSTORMY16_OPERAND_RM :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rm, 0);
      break;
    case XSTORMY16_OPERAND_RS :
      print_keyword (cd, info, & xstormy16_cgen_opval_gr_names, fields->f_Rs, 0);
      break;
    case XSTORMY16_OPERAND_ABS24 :
      print_normal (cd, info, fields->f_abs24, 0|(1<<CGEN_OPERAND_ABS_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case XSTORMY16_OPERAND_BCOND2 :
      print_keyword (cd, info, & xstormy16_cgen_opval_h_branchcond, fields->f_op2, 0);
      break;
    case XSTORMY16_OPERAND_BCOND5 :
      print_keyword (cd, info, & xstormy16_cgen_opval_h_branchcond, fields->f_op5, 0);
      break;
    case XSTORMY16_OPERAND_HMEM8 :
      print_normal (cd, info, fields->f_hmem8, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_IMM12 :
      print_normal (cd, info, fields->f_imm12, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);
      break;
    case XSTORMY16_OPERAND_IMM16 :
      print_normal (cd, info, fields->f_imm16, 0|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);
      break;
    case XSTORMY16_OPERAND_IMM2 :
      print_normal (cd, info, fields->f_imm2, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_IMM3 :
      print_normal (cd, info, fields->f_imm3, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_IMM3B :
      print_normal (cd, info, fields->f_imm3b, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_IMM4 :
      print_normal (cd, info, fields->f_imm4, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_IMM8 :
      print_normal (cd, info, fields->f_imm8, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_IMM8SMALL :
      print_normal (cd, info, fields->f_imm8, 0, pc, length);
      break;
    case XSTORMY16_OPERAND_LMEM8 :
      print_normal (cd, info, fields->f_lmem8, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_REL12 :
      print_normal (cd, info, fields->f_rel12, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_REL12A :
      print_normal (cd, info, fields->f_rel12a, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_REL8_2 :
      print_normal (cd, info, fields->f_rel8_2, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_REL8_4 :
      print_normal (cd, info, fields->f_rel8_4, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case XSTORMY16_OPERAND_WS2 :
      print_keyword (cd, info, & xstormy16_cgen_opval_h_wordsize, fields->f_op2m, 0);
      break;

    default :
      /* xgettext:c-format */
      fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
	       opindex);
    abort ();
  }
}

cgen_print_fn * const xstormy16_cgen_print_handlers[] = 
{
  print_insn_normal,
};


void
xstormy16_cgen_init_dis (CGEN_CPU_DESC cd)
{
  xstormy16_cgen_init_opcode_table (cd);
  xstormy16_cgen_init_ibld_table (cd);
  cd->print_handlers = & xstormy16_cgen_print_handlers[0];
  cd->print_operand = xstormy16_cgen_print_operand;
}


/* Default print handler.  */

static void
print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	      void *dis_info,
	      long value,
	      unsigned int attrs,
	      bfd_vma pc ATTRIBUTE_UNUSED,
	      int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_NORMAL
  CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", value);
}

/* Default address handler.  */

static void
print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       bfd_vma value,
	       unsigned int attrs,
	       bfd_vma pc ATTRIBUTE_UNUSED,
	       int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_ADDRESS
  CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* Nothing to do.  */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", (long) value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
}

/* Keyword print handler.  */

static void
print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       CGEN_KEYWORD *keyword_table,
	       long value,
	       unsigned int attrs ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_KEYWORD_ENTRY *ke;

  ke = cgen_keyword_lookup_value (keyword_table, value);
  if (ke != NULL)
    (*info->fprintf_func) (info->stream, "%s", ke->name);
  else
    (*info->fprintf_func) (info->stream, "???");
}

/* Default insn printer.

   DIS_INFO is defined as `void *' so the disassembler needn't know anything
   about disassemble_info.  */

static void
print_insn_normal (CGEN_CPU_DESC cd,
		   void *dis_info,
		   const CGEN_INSN *insn,
		   CGEN_FIELDS *fields,
		   bfd_vma pc,
		   int length)
{
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_SYNTAX_CHAR_TYPE *syn;

  CGEN_INIT_PRINT (cd);

  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
    {
      if (CGEN_SYNTAX_MNEMONIC_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
	  continue;
	}
      if (CGEN_SYNTAX_CHAR_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
	  continue;
	}

      /* We have an operand.  */
      xstormy16_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
				 fields, CGEN_INSN_ATTRS (insn), pc, length);
    }
}

/* Subroutine of print_insn. Reads an insn into the given buffers and updates
   the extract info.
   Returns 0 if all is well, non-zero otherwise.  */

static int
read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   bfd_vma pc,
	   disassemble_info *info,
	   bfd_byte *buf,
	   int buflen,
	   CGEN_EXTRACT_INFO *ex_info,
	   unsigned long *insn_value)
{
  int status = (*info->read_memory_func) (pc, buf, buflen, info);

  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  ex_info->dis_info = info;
  ex_info->valid = (1 << buflen) - 1;
  ex_info->insn_bytes = buf;

  *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
  return 0;
}

/* Utility to print an insn.
   BUF is the base part of the insn, target byte order, BUFLEN bytes long.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occurs fetching data (memory_error_func will have
   been called).  */

static int
print_insn (CGEN_CPU_DESC cd,
	    bfd_vma pc,
	    disassemble_info *info,
	    bfd_byte *buf,
	    unsigned int buflen)
{
  CGEN_INSN_INT insn_value;
  const CGEN_INSN_LIST *insn_list;
  CGEN_EXTRACT_INFO ex_info;
  int basesize;

  /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
  basesize = cd->base_insn_bitsize < buflen * 8 ?
                                     cd->base_insn_bitsize : buflen * 8;
  insn_value = cgen_get_insn_value (cd, buf, basesize);


  /* Fill in ex_info fields like read_insn would.  Don't actually call
     read_insn, since the incoming buffer is already read (and possibly
     modified a la m32r).  */
  ex_info.valid = (1 << buflen) - 1;
  ex_info.dis_info = info;
  ex_info.insn_bytes = buf;

  /* The instructions are stored in hash lists.
     Pick the first one and keep trying until we find the right one.  */

  insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
  while (insn_list != NULL)
    {
      const CGEN_INSN *insn = insn_list->insn;
      CGEN_FIELDS fields;
      int length;
      unsigned long insn_value_cropped;

#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
      /* Not needed as insn shouldn't be in hash lists if not supported.  */
      /* Supported by this cpu?  */
      if (! xstormy16_cgen_insn_supported (cd, insn))
        {
          insn_list = CGEN_DIS_NEXT_INSN (insn_list);
	  continue;
        }
#endif

      /* Basic bit mask must be correct.  */
      /* ??? May wish to allow target to defer this check until the extract
	 handler.  */

      /* Base size may exceed this instruction's size.  Extract the
         relevant part from the buffer. */
      if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
	  (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn), 
					   info->endian == BFD_ENDIAN_BIG);
      else
	insn_value_cropped = insn_value;

      if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
	  == CGEN_INSN_BASE_VALUE (insn))
	{
	  /* Printing is handled in two passes.  The first pass parses the
	     machine insn and extracts the fields.  The second pass prints
	     them.  */

	  /* Make sure the entire insn is loaded into insn_value, if it
	     can fit.  */
	  if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
	      (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	    {
	      unsigned long full_insn_value;
	      int rc = read_insn (cd, pc, info, buf,
				  CGEN_INSN_BITSIZE (insn) / 8,
				  & ex_info, & full_insn_value);
	      if (rc != 0)
		return rc;
	      length = CGEN_EXTRACT_FN (cd, insn)
		(cd, insn, &ex_info, full_insn_value, &fields, pc);
	    }
	  else
	    length = CGEN_EXTRACT_FN (cd, insn)
	      (cd, insn, &ex_info, insn_value_cropped, &fields, pc);

	  /* Length < 0 -> error.  */
	  if (length < 0)
	    return length;
	  if (length > 0)
	    {
	      CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
	      /* Length is in bits, result is in bytes.  */
	      return length / 8;
	    }
	}

      insn_list = CGEN_DIS_NEXT_INSN (insn_list);
    }

  return 0;
}

/* Default value for CGEN_PRINT_INSN.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occured fetching bytes.  */

#ifndef CGEN_PRINT_INSN
#define CGEN_PRINT_INSN default_print_insn
#endif

static int
default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
{
  bfd_byte buf[CGEN_MAX_INSN_SIZE];
  int buflen;
  int status;

  /* Attempt to read the base part of the insn.  */
  buflen = cd->base_insn_bitsize / 8;
  status = (*info->read_memory_func) (pc, buf, buflen, info);

  /* Try again with the minimum part, if min < base.  */
  if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
    {
      buflen = cd->min_insn_bitsize / 8;
      status = (*info->read_memory_func) (pc, buf, buflen, info);
    }

  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  return print_insn (cd, pc, info, buf, buflen);
}

/* Main entry point.
   Print one instruction from PC on INFO->STREAM.
   Return the size of the instruction (in bytes).  */

typedef struct cpu_desc_list
{
  struct cpu_desc_list *next;
  CGEN_BITSET *isa;
  int mach;
  int endian;
  CGEN_CPU_DESC cd;
} cpu_desc_list;

int
print_insn_xstormy16 (bfd_vma pc, disassemble_info *info)
{
  static cpu_desc_list *cd_list = 0;
  cpu_desc_list *cl = 0;
  static CGEN_CPU_DESC cd = 0;
  static CGEN_BITSET *prev_isa;
  static int prev_mach;
  static int prev_endian;
  int length;
  CGEN_BITSET *isa;
  int mach;
  int endian = (info->endian == BFD_ENDIAN_BIG
		? CGEN_ENDIAN_BIG
		: CGEN_ENDIAN_LITTLE);
  enum bfd_architecture arch;

  /* ??? gdb will set mach but leave the architecture as "unknown" */
#ifndef CGEN_BFD_ARCH
#define CGEN_BFD_ARCH bfd_arch_xstormy16
#endif
  arch = info->arch;
  if (arch == bfd_arch_unknown)
    arch = CGEN_BFD_ARCH;
   
  /* There's no standard way to compute the machine or isa number
     so we leave it to the target.  */
#ifdef CGEN_COMPUTE_MACH
  mach = CGEN_COMPUTE_MACH (info);
#else
  mach = info->mach;
#endif

#ifdef CGEN_COMPUTE_ISA
  {
    static CGEN_BITSET *permanent_isa;

    if (!permanent_isa)
      permanent_isa = cgen_bitset_create (MAX_ISAS);
    isa = permanent_isa;
    cgen_bitset_clear (isa);
    cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
  }
#else
  isa = info->insn_sets;
#endif

  /* If we've switched cpu's, try to find a handle we've used before */
  if (cd
      && (cgen_bitset_compare (isa, prev_isa) != 0
	  || mach != prev_mach
	  || endian != prev_endian))
    {
      cd = 0;
      for (cl = cd_list; cl; cl = cl->next)
	{
	  if (cgen_bitset_compare (cl->isa, isa) == 0 &&
	      cl->mach == mach &&
	      cl->endian == endian)
	    {
	      cd = cl->cd;
 	      prev_isa = cd->isas;
	      break;
	    }
	}
    } 

  /* If we haven't initialized yet, initialize the opcode table.  */
  if (! cd)
    {
      const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
      const char *mach_name;

      if (!arch_type)
	abort ();
      mach_name = arch_type->printable_name;

      prev_isa = cgen_bitset_copy (isa);
      prev_mach = mach;
      prev_endian = endian;
      cd = xstormy16_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
				 CGEN_CPU_OPEN_BFDMACH, mach_name,
				 CGEN_CPU_OPEN_ENDIAN, prev_endian,
				 CGEN_CPU_OPEN_END);
      if (!cd)
	abort ();

      /* Save this away for future reference.  */
      cl = xmalloc (sizeof (struct cpu_desc_list));
      cl->cd = cd;
      cl->isa = prev_isa;
      cl->mach = mach;
      cl->endian = endian;
      cl->next = cd_list;
      cd_list = cl;

      xstormy16_cgen_init_dis (cd);
    }

  /* We try to have as much common code as possible.
     But at this point some targets need to take over.  */
  /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
     but if not possible try to move this hook elsewhere rather than
     have two hooks.  */
  length = CGEN_PRINT_INSN (cd, pc, info);
  if (length > 0)
    return length;
  if (length < 0)
    return -1;

  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
  return cd->default_insn_bitsize / 8;
}