File: cgen-opc.c

package info (click to toggle)
gdb 7.12-6
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 216,152 kB
  • ctags: 304,881
  • sloc: ansic: 2,141,328; asm: 331,662; exp: 133,348; makefile: 57,698; sh: 23,586; yacc: 14,054; cpp: 12,262; perl: 5,300; python: 4,685; ada: 4,343; xml: 3,670; pascal: 3,120; lisp: 1,516; cs: 879; lex: 624; f90: 457; sed: 228; awk: 142; objc: 134; java: 73; fortran: 43
file content (614 lines) | stat: -rw-r--r-- 17,018 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
/* CGEN generic opcode support.

   Copyright (C) 1996-2016 Free Software Foundation, Inc.

   This file is part of libopcodes.

   This library 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 3, or (at your option)
   any later version.

   It 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.  */

#include "sysdep.h"
#include "alloca-conf.h"
#include <stdio.h>
#include "ansidecl.h"
#include "libiberty.h"
#include "safe-ctype.h"
#include "bfd.h"
#include "symcat.h"
#include "opcode/cgen.h"

static unsigned int hash_keyword_name
  (const CGEN_KEYWORD *, const char *, int);
static unsigned int hash_keyword_value
  (const CGEN_KEYWORD *, unsigned int);
static void build_keyword_hash_tables
  (CGEN_KEYWORD *);

/* Return number of hash table entries to use for N elements.  */
#define KEYWORD_HASH_SIZE(n) ((n) <= 31 ? 17 : 31)

/* Look up *NAMEP in the keyword table KT.
   The result is the keyword entry or NULL if not found.  */

const CGEN_KEYWORD_ENTRY *
cgen_keyword_lookup_name (CGEN_KEYWORD *kt, const char *name)
{
  const CGEN_KEYWORD_ENTRY *ke;
  const char *p,*n;

  if (kt->name_hash_table == NULL)
    build_keyword_hash_tables (kt);

  ke = kt->name_hash_table[hash_keyword_name (kt, name, 0)];

  /* We do case insensitive comparisons.
     If that ever becomes a problem, add an attribute that denotes
     "do case sensitive comparisons".  */

  while (ke != NULL)
    {
      n = name;
      p = ke->name;

      while (*p
	     && (*p == *n
		 || (ISALPHA (*p) && (TOLOWER (*p) == TOLOWER (*n)))))
	++n, ++p;

      if (!*p && !*n)
	return ke;

      ke = ke->next_name;
    }

  if (kt->null_entry)
    return kt->null_entry;
  return NULL;
}

/* Look up VALUE in the keyword table KT.
   The result is the keyword entry or NULL if not found.  */

const CGEN_KEYWORD_ENTRY *
cgen_keyword_lookup_value (CGEN_KEYWORD *kt, int value)
{
  const CGEN_KEYWORD_ENTRY *ke;

  if (kt->name_hash_table == NULL)
    build_keyword_hash_tables (kt);

  ke = kt->value_hash_table[hash_keyword_value (kt, value)];

  while (ke != NULL)
    {
      if (value == ke->value)
	return ke;
      ke = ke->next_value;
    }

  return NULL;
}

/* Add an entry to a keyword table.  */

void
cgen_keyword_add (CGEN_KEYWORD *kt, CGEN_KEYWORD_ENTRY *ke)
{
  unsigned int hash;
  size_t i;

  if (kt->name_hash_table == NULL)
    build_keyword_hash_tables (kt);

  hash = hash_keyword_name (kt, ke->name, 0);
  ke->next_name = kt->name_hash_table[hash];
  kt->name_hash_table[hash] = ke;

  hash = hash_keyword_value (kt, ke->value);
  ke->next_value = kt->value_hash_table[hash];
  kt->value_hash_table[hash] = ke;

  if (ke->name[0] == 0)
    kt->null_entry = ke;

  for (i = 1; i < strlen (ke->name); i++)
    if (! ISALNUM (ke->name[i])
	&& ! strchr (kt->nonalpha_chars, ke->name[i]))
      {
	size_t idx = strlen (kt->nonalpha_chars);

	/* If you hit this limit, please don't just
	   increase the size of the field, instead
	   look for a better algorithm.  */
	if (idx >= sizeof (kt->nonalpha_chars) - 1)
	  abort ();
	kt->nonalpha_chars[idx] = ke->name[i];
	kt->nonalpha_chars[idx+1] = 0;
      }
}

/* FIXME: Need function to return count of keywords.  */

/* Initialize a keyword table search.
   SPEC is a specification of what to search for.
   A value of NULL means to find every keyword.
   Currently NULL is the only acceptable value [further specification
   deferred].
   The result is an opaque data item used to record the search status.
   It is passed to each call to cgen_keyword_search_next.  */

CGEN_KEYWORD_SEARCH
cgen_keyword_search_init (CGEN_KEYWORD *kt, const char *spec)
{
  CGEN_KEYWORD_SEARCH search;

  /* FIXME: Need to specify format of params.  */
  if (spec != NULL)
    abort ();

  if (kt->name_hash_table == NULL)
    build_keyword_hash_tables (kt);

  search.table = kt;
  search.spec = spec;
  search.current_hash = 0;
  search.current_entry = NULL;
  return search;
}

/* Return the next keyword specified by SEARCH.
   The result is the next entry or NULL if there are no more.  */

const CGEN_KEYWORD_ENTRY *
cgen_keyword_search_next (CGEN_KEYWORD_SEARCH *search)
{
  /* Has search finished?  */
  if (search->current_hash == search->table->hash_table_size)
    return NULL;

  /* Search in progress?  */
  if (search->current_entry != NULL
      /* Anything left on this hash chain?  */
      && search->current_entry->next_name != NULL)
    {
      search->current_entry = search->current_entry->next_name;
      return search->current_entry;
    }

  /* Move to next hash chain [unless we haven't started yet].  */
  if (search->current_entry != NULL)
    ++search->current_hash;

  while (search->current_hash < search->table->hash_table_size)
    {
      search->current_entry = search->table->name_hash_table[search->current_hash];
      if (search->current_entry != NULL)
	return search->current_entry;
      ++search->current_hash;
    }

  return NULL;
}

/* Return first entry in hash chain for NAME.
   If CASE_SENSITIVE_P is non-zero, return a case sensitive hash.  */

static unsigned int
hash_keyword_name (const CGEN_KEYWORD *kt,
		   const char *name,
		   int case_sensitive_p)
{
  unsigned int hash;

  if (case_sensitive_p)
    for (hash = 0; *name; ++name)
      hash = (hash * 97) + (unsigned char) *name;
  else
    for (hash = 0; *name; ++name)
      hash = (hash * 97) + (unsigned char) TOLOWER (*name);
  return hash % kt->hash_table_size;
}

/* Return first entry in hash chain for VALUE.  */

static unsigned int
hash_keyword_value (const CGEN_KEYWORD *kt, unsigned int value)
{
  return value % kt->hash_table_size;
}

/* Build a keyword table's hash tables.
   We probably needn't build the value hash table for the assembler when
   we're using the disassembler, but we keep things simple.  */

static void
build_keyword_hash_tables (CGEN_KEYWORD *kt)
{
  int i;
  /* Use the number of compiled in entries as an estimate for the
     typical sized table [not too many added at runtime].  */
  unsigned int size = KEYWORD_HASH_SIZE (kt->num_init_entries);

  kt->hash_table_size = size;
  kt->name_hash_table = (CGEN_KEYWORD_ENTRY **)
    xmalloc (size * sizeof (CGEN_KEYWORD_ENTRY *));
  memset (kt->name_hash_table, 0, size * sizeof (CGEN_KEYWORD_ENTRY *));
  kt->value_hash_table = (CGEN_KEYWORD_ENTRY **)
    xmalloc (size * sizeof (CGEN_KEYWORD_ENTRY *));
  memset (kt->value_hash_table, 0, size * sizeof (CGEN_KEYWORD_ENTRY *));

  /* The table is scanned backwards as we want keywords appearing earlier to
     be prefered over later ones.  */
  for (i = kt->num_init_entries - 1; i >= 0; --i)
    cgen_keyword_add (kt, &kt->init_entries[i]);
}

/* Hardware support.  */

/* Lookup a hardware element by its name.
   Returns NULL if NAME is not supported by the currently selected
   mach/isa.  */

const CGEN_HW_ENTRY *
cgen_hw_lookup_by_name (CGEN_CPU_DESC cd, const char *name)
{
  unsigned int i;
  const CGEN_HW_ENTRY **hw = cd->hw_table.entries;

  for (i = 0; i < cd->hw_table.num_entries; ++i)
    if (hw[i] && strcmp (name, hw[i]->name) == 0)
      return hw[i];

  return NULL;
}

/* Lookup a hardware element by its number.
   Hardware elements are enumerated, however it may be possible to add some
   at runtime, thus HWNUM is not an enum type but rather an int.
   Returns NULL if HWNUM is not supported by the currently selected mach.  */

const CGEN_HW_ENTRY *
cgen_hw_lookup_by_num (CGEN_CPU_DESC cd, unsigned int hwnum)
{
  unsigned int i;
  const CGEN_HW_ENTRY **hw = cd->hw_table.entries;

  /* ??? This can be speeded up.  */
  for (i = 0; i < cd->hw_table.num_entries; ++i)
    if (hw[i] && hwnum == hw[i]->type)
      return hw[i];

  return NULL;
}

/* Operand support.  */

/* Lookup an operand by its name.
   Returns NULL if NAME is not supported by the currently selected
   mach/isa.  */

const CGEN_OPERAND *
cgen_operand_lookup_by_name (CGEN_CPU_DESC cd, const char *name)
{
  unsigned int i;
  const CGEN_OPERAND **op = cd->operand_table.entries;

  for (i = 0; i < cd->operand_table.num_entries; ++i)
    if (op[i] && strcmp (name, op[i]->name) == 0)
      return op[i];

  return NULL;
}

/* Lookup an operand by its number.
   Operands are enumerated, however it may be possible to add some
   at runtime, thus OPNUM is not an enum type but rather an int.
   Returns NULL if OPNUM is not supported by the currently selected
   mach/isa.  */

const CGEN_OPERAND *
cgen_operand_lookup_by_num (CGEN_CPU_DESC cd, int opnum)
{
  return cd->operand_table.entries[opnum];
}

/* Instruction support.  */

/* Return number of instructions.  This includes any added at runtime.  */

int
cgen_insn_count (CGEN_CPU_DESC cd)
{
  int count = cd->insn_table.num_init_entries;
  CGEN_INSN_LIST *rt_insns = cd->insn_table.new_entries;

  for ( ; rt_insns != NULL; rt_insns = rt_insns->next)
    ++count;

  return count;
}

/* Return number of macro-instructions.
   This includes any added at runtime.  */

int
cgen_macro_insn_count (CGEN_CPU_DESC cd)
{
  int count = cd->macro_insn_table.num_init_entries;
  CGEN_INSN_LIST *rt_insns = cd->macro_insn_table.new_entries;

  for ( ; rt_insns != NULL; rt_insns = rt_insns->next)
    ++count;

  return count;
}

/* Cover function to read and properly byteswap an insn value.  */

CGEN_INSN_INT
cgen_get_insn_value (CGEN_CPU_DESC cd, unsigned char *buf, int length)
{
  int big_p = (cd->insn_endian == CGEN_ENDIAN_BIG);
  int insn_chunk_bitsize = cd->insn_chunk_bitsize;
  CGEN_INSN_INT value = 0;

  if (insn_chunk_bitsize != 0 && insn_chunk_bitsize < length)
    {
      /* We need to divide up the incoming value into insn_chunk_bitsize-length
	 segments, and endian-convert them, one at a time. */
      int i;

      /* Enforce divisibility. */
      if ((length % insn_chunk_bitsize) != 0)
	abort ();

      for (i = 0; i < length; i += insn_chunk_bitsize) /* NB: i == bits */
	{
	  int bit_index;
	  bfd_vma this_value;

	  bit_index = i; /* NB: not dependent on endianness; opposite of cgen_put_insn_value! */
	  this_value = bfd_get_bits (& buf[bit_index / 8], insn_chunk_bitsize, big_p);
	  value = (value << insn_chunk_bitsize) | this_value;
	}
    }
  else
    {
      value = bfd_get_bits (buf, length, cd->insn_endian == CGEN_ENDIAN_BIG);
    }

  return value;
}

/* Cover function to store an insn value properly byteswapped.  */

void
cgen_put_insn_value (CGEN_CPU_DESC cd,
		     unsigned char *buf,
		     int length,
		     CGEN_INSN_INT value)
{
  int big_p = (cd->insn_endian == CGEN_ENDIAN_BIG);
  int insn_chunk_bitsize = cd->insn_chunk_bitsize;

  if (insn_chunk_bitsize != 0 && insn_chunk_bitsize < length)
    {
      /* We need to divide up the incoming value into insn_chunk_bitsize-length
	 segments, and endian-convert them, one at a time. */
      int i;

      /* Enforce divisibility. */
      if ((length % insn_chunk_bitsize) != 0)
	abort ();

      for (i = 0; i < length; i += insn_chunk_bitsize) /* NB: i == bits */
	{
	  int bit_index;

	  bit_index = (length - insn_chunk_bitsize - i); /* NB: not dependent on endianness! */
	  bfd_put_bits ((bfd_vma) value, & buf[bit_index / 8], insn_chunk_bitsize, big_p);
	  value >>= insn_chunk_bitsize;
	}
    }
  else
    {
      bfd_put_bits ((bfd_vma) value, buf, length, big_p);
    }
}

/* Look up instruction INSN_*_VALUE and extract its fields.
   INSN_INT_VALUE is used if CGEN_INT_INSN_P.
   Otherwise INSN_BYTES_VALUE is used.
   INSN, if non-null, is the insn table entry.
   Otherwise INSN_*_VALUE is examined to compute it.
   LENGTH is the bit length of INSN_*_VALUE if known, otherwise 0.
   0 is only valid if `insn == NULL && ! CGEN_INT_INSN_P'.
   If INSN != NULL, LENGTH must be valid.
   ALIAS_P is non-zero if alias insns are to be included in the search.

   The result is a pointer to the insn table entry, or NULL if the instruction
   wasn't recognized.  */

/* ??? Will need to be revisited for VLIW architectures.  */

const CGEN_INSN *
cgen_lookup_insn (CGEN_CPU_DESC cd,
		  const CGEN_INSN *insn,
		  CGEN_INSN_INT insn_int_value,
		  /* ??? CGEN_INSN_BYTES would be a nice type name to use here.  */
		  unsigned char *insn_bytes_value,
		  int length,
		  CGEN_FIELDS *fields,
		  int alias_p)
{
  unsigned char *buf;
  CGEN_INSN_INT base_insn;
  CGEN_EXTRACT_INFO ex_info;
  CGEN_EXTRACT_INFO *info;

  if (cd->int_insn_p)
    {
      info = NULL;
      buf = (unsigned char *) xmalloc (cd->max_insn_bitsize / 8);
      cgen_put_insn_value (cd, buf, length, insn_int_value);
      base_insn = insn_int_value;
      free (buf);
    }
  else
    {
      info = &ex_info;
      ex_info.dis_info = NULL;
      ex_info.insn_bytes = insn_bytes_value;
      ex_info.valid = -1;
      buf = insn_bytes_value;
      base_insn = cgen_get_insn_value (cd, buf, length);
    }

  if (!insn)
    {
      const CGEN_INSN_LIST *insn_list;

      /* 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, base_insn);
      while (insn_list != NULL)
	{
	  insn = insn_list->insn;

	  if (alias_p
	      /* FIXME: Ensure ALIAS attribute always has same index.  */
	      || ! CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_ALIAS))
	    {
	      /* Basic bit mask must be correct.  */
	      /* ??? May wish to allow target to defer this check until the
		 extract handler.  */
	      if ((base_insn & CGEN_INSN_BASE_MASK (insn))
		  == CGEN_INSN_BASE_VALUE (insn))
		{
		  /* ??? 0 is passed for `pc' */
		  int elength = CGEN_EXTRACT_FN (cd, insn)
		    (cd, insn, info, base_insn, fields, (bfd_vma) 0);
		  if (elength > 0)
		    {
		      /* sanity check */
		      if (length != 0 && length != elength)
			abort ();
		      return insn;
		    }
		}
	    }

	  insn_list = insn_list->next;
	}
    }
  else
    {
      /* Sanity check: can't pass an alias insn if ! alias_p.  */
      if (! alias_p
	  && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_ALIAS))
	abort ();
      /* Sanity check: length must be correct.  */
      if (length != CGEN_INSN_BITSIZE (insn))
	abort ();

      /* ??? 0 is passed for `pc' */
      length = CGEN_EXTRACT_FN (cd, insn)
	(cd, insn, info, base_insn, fields, (bfd_vma) 0);
      /* Sanity check: must succeed.
	 Could relax this later if it ever proves useful.  */
      if (length == 0)
	abort ();
      return insn;
    }

  return NULL;
}

/* Fill in the operand instances used by INSN whose operands are FIELDS.
   INDICES is a pointer to a buffer of MAX_OPERAND_INSTANCES ints to be filled
   in.  */

void
cgen_get_insn_operands (CGEN_CPU_DESC cd,
			const CGEN_INSN *insn,
			const CGEN_FIELDS *fields,
			int *indices)
{
  const CGEN_OPINST *opinst;
  int i;

  if (insn->opinst == NULL)
    abort ();
  for (i = 0, opinst = insn->opinst; opinst->type != CGEN_OPINST_END; ++i, ++opinst)
    {
      enum cgen_operand_type op_type = opinst->op_type;
      if (op_type == CGEN_OPERAND_NIL)
	indices[i] = opinst->index;
      else
	indices[i] = (*cd->get_int_operand) (cd, op_type, fields);
    }
}

/* Cover function to cgen_get_insn_operands when either INSN or FIELDS
   isn't known.
   The INSN, INSN_*_VALUE, and LENGTH arguments are passed to
   cgen_lookup_insn unchanged.
   INSN_INT_VALUE is used if CGEN_INT_INSN_P.
   Otherwise INSN_BYTES_VALUE is used.

   The result is the insn table entry or NULL if the instruction wasn't
   recognized.  */

const CGEN_INSN *
cgen_lookup_get_insn_operands (CGEN_CPU_DESC cd,
			       const CGEN_INSN *insn,
			       CGEN_INSN_INT insn_int_value,
			       /* ??? CGEN_INSN_BYTES would be a nice type name to use here.  */
			       unsigned char *insn_bytes_value,
			       int length,
			       int *indices,
			       CGEN_FIELDS *fields)
{
  /* Pass non-zero for ALIAS_P only if INSN != NULL.
     If INSN == NULL, we want a real insn.  */
  insn = cgen_lookup_insn (cd, insn, insn_int_value, insn_bytes_value,
			   length, fields, insn != NULL);
  if (! insn)
    return NULL;

  cgen_get_insn_operands (cd, insn, fields, indices);
  return insn;
}

/* Allow signed overflow of instruction fields.  */
void
cgen_set_signed_overflow_ok (CGEN_CPU_DESC cd)
{
  cd->signed_overflow_ok_p = 1;
}

/* Generate an error message if a signed field in an instruction overflows.  */
void
cgen_clear_signed_overflow_ok (CGEN_CPU_DESC cd)
{
  cd->signed_overflow_ok_p = 0;
}

/* Will an error message be generated if a signed field in an instruction overflows ? */
unsigned int
cgen_signed_overflow_ok_p (CGEN_CPU_DESC cd)
{
  return cd->signed_overflow_ok_p;
}