aboutsummaryrefslogtreecommitdiff
path: root/gas/cgen.c
blob: d334e663756ac79fdf228d33889d1738650ec7d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
/* GAS interface for targets using CGEN: Cpu tools GENerator.
   Copyright 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.

This file is part of GAS, the GNU Assembler.

GAS 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.

GAS 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 GAS; see the file COPYING.  If not, write to the Free Software
Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <setjmp.h>
#include "ansidecl.h"
#include "libiberty.h"
#include "bfd.h"
#include "symcat.h"
#include "cgen-desc.h"
#include "as.h"
#include "subsegs.h"
#include "cgen.h"
#include "dwarf2dbg.h"

/* Opcode table descriptor, must be set by md_begin.  */

CGEN_CPU_DESC gas_cgen_cpu_desc;

/* Callback to insert a register into the symbol table.
   A target may choose to let GAS parse the registers.
   ??? Not currently used.  */

void
cgen_asm_record_register (name, number)
     char *name;
     int number;
{
  /* Use symbol_create here instead of symbol_new so we don't try to
     output registers into the object file's symbol table.  */
  symbol_table_insert (symbol_create (name, reg_section,
				      number, &zero_address_frag));
}

/* We need to keep a list of fixups.  We can't simply generate them as
   we go, because that would require us to first create the frag, and
   that would screw up references to ``.''.

   This is used by cpu's with simple operands.  It keeps knowledge of what
   an `expressionS' is and what a `fixup' is out of CGEN which for the time
   being is preferable.

   OPINDEX is the index in the operand table.
   OPINFO is something the caller chooses to help in reloc determination.  */

struct fixup {
  int opindex;
  int opinfo;
  expressionS exp;
};

static struct fixup fixups[GAS_CGEN_MAX_FIXUPS];
static int num_fixups;

/* Prepare to parse an instruction.
   ??? May wish to make this static and delete calls in md_assemble.  */

void
gas_cgen_init_parse ()
{
  num_fixups = 0;
}

/* Queue a fixup.  */

static void
queue_fixup (opindex, opinfo, expP)
     int           opindex;
     int           opinfo;
     expressionS * expP;
{
  /* We need to generate a fixup for this expression.  */
  if (num_fixups >= GAS_CGEN_MAX_FIXUPS)
    as_fatal (_("too many fixups"));
  fixups[num_fixups].exp     = *expP;
  fixups[num_fixups].opindex = opindex;
  fixups[num_fixups].opinfo  = opinfo;
  ++ num_fixups;
}

/* The following functions allow fixup chains to be stored, retrieved,
   and swapped.  They are a generalization of a pre-existing scheme
   for storing, restoring and swapping fixup chains that was used by
   the m32r port.  The functionality is essentially the same, only
   instead of only being able to store a single fixup chain, an entire
   array of fixup chains can be stored.  It is the user's responsibility
   to keep track of how many fixup chains have been stored and which
   elements of the array they are in.

   The algorithms used are the same as in the old scheme.  Other than the 
   "array-ness" of the whole thing, the functionality is identical to the 
   old scheme.

   gas_cgen_initialize_saved_fixups_array():
      Sets num_fixups_in_chain to 0 for each element. Call this from
      md_begin() if you plan to use these functions and you want the
      fixup count in each element to be set to 0 intially.  This is
      not necessary, but it's included just in case.  It performs
      the same function for each element in the array of fixup chains
      that gas_init_parse() performs for the current fixups.

   gas_cgen_save_fixups (element):
      element - element number of the array you wish to store the fixups
                to.  No mechanism is built in for tracking what element
                was last stored to.

   gas_cgen_restore_fixups (element):
      element - element number of the array you wish to restore the fixups
                from.

   gas_cgen_swap_fixups(int element):
       element - swap the current fixups with those in this element number.
*/

struct saved_fixups {
  struct fixup fixup_chain[GAS_CGEN_MAX_FIXUPS];
  int num_fixups_in_chain;
};

static struct saved_fixups stored_fixups[MAX_SAVED_FIXUP_CHAINS];

void
gas_cgen_initialize_saved_fixups_array ()
{
  int i = 0;

  while (i < MAX_SAVED_FIXUP_CHAINS)
    stored_fixups[i++].num_fixups_in_chain = 0;
}

void
gas_cgen_save_fixups (i)
     int i;
{
  if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
    {
      as_fatal ("index into stored_fixups[] out of bounds");
      return;
    }

  stored_fixups[i].num_fixups_in_chain = num_fixups;
  memcpy (stored_fixups[i].fixup_chain, fixups,
	  sizeof (fixups[0]) * num_fixups);
  num_fixups = 0;
}

void
gas_cgen_restore_fixups (i)
     int i;
{
  if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
    {
      as_fatal ("index into stored_fixups[] out of bounds");
      return;
    }

  num_fixups = stored_fixups[i].num_fixups_in_chain;
  memcpy (fixups,stored_fixups[i].fixup_chain,
	  (sizeof (stored_fixups[i].fixup_chain[0])) * num_fixups);
  stored_fixups[i].num_fixups_in_chain = 0;
}

void
gas_cgen_swap_fixups (i)
     int i;
{
  if (i < 0 || i >= MAX_SAVED_FIXUP_CHAINS)
    {
      as_fatal ("index into stored_fixups[] out of bounds");
      return;
    }

  if (num_fixups == 0)
    gas_cgen_restore_fixups (i);

  else if (stored_fixups[i].num_fixups_in_chain == 0)
    gas_cgen_save_fixups (i);

  else
    {
      int tmp;
      struct fixup tmp_fixup;

      tmp = stored_fixups[i].num_fixups_in_chain;
      stored_fixups[i].num_fixups_in_chain = num_fixups;
      num_fixups = tmp;

      for (tmp = GAS_CGEN_MAX_FIXUPS; tmp--;)
	{
	  tmp_fixup = stored_fixups[i].fixup_chain [tmp];
	  stored_fixups[i].fixup_chain[tmp] = fixups [tmp];
	  fixups [tmp] = tmp_fixup;
	}
    }
}

/* Default routine to record a fixup.
   This is a cover function to fix_new.
   It exists because we record INSN with the fixup.

   FRAG and WHERE are their respective arguments to fix_new_exp.
   LENGTH is in bits.
   OPINFO is something the caller chooses to help in reloc determination.

   At this point we do not use a bfd_reloc_code_real_type for
   operands residing in the insn, but instead just use the
   operand index.  This lets us easily handle fixups for any
   operand type.  We pick a BFD reloc type in md_apply_fix.  */

fixS *
gas_cgen_record_fixup (frag, where, insn, length, operand, opinfo, symbol, offset)
     fragS *              frag;
     int                  where;
     const CGEN_INSN *    insn;
     int                  length;
     const CGEN_OPERAND * operand;
     int                  opinfo;
     symbolS *            symbol;
     offsetT              offset;
{
  fixS *fixP;

  /* It may seem strange to use operand->attrs and not insn->attrs here,
     but it is the operand that has a pc relative relocation.  */

  fixP = fix_new (frag, where, length / 8, symbol, offset,
		  CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR),
		  (bfd_reloc_code_real_type)
		    ((int) BFD_RELOC_UNUSED
		     + (int) operand->type));
  fixP->fx_cgen.insn = insn;
  fixP->fx_cgen.opinfo = opinfo;

  return fixP;
}

/* Default routine to record a fixup given an expression.
   This is a cover function to fix_new_exp.
   It exists because we record INSN with the fixup.

   FRAG and WHERE are their respective arguments to fix_new_exp.
   LENGTH is in bits.
   OPINFO is something the caller chooses to help in reloc determination.

   At this point we do not use a bfd_reloc_code_real_type for
   operands residing in the insn, but instead just use the
   operand index.  This lets us easily handle fixups for any
   operand type.  We pick a BFD reloc type in md_apply_fix.  */

fixS *
gas_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp)
     fragS *              frag;
     int                  where;
     const CGEN_INSN *    insn;
     int                  length;
     const CGEN_OPERAND * operand;
     int                  opinfo;
     expressionS *        exp;
{
  fixS *fixP;

  /* It may seem strange to use operand->attrs and not insn->attrs here,
     but it is the operand that has a pc relative relocation.  */

  fixP = fix_new_exp (frag, where, length / 8, exp,
		      CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_PCREL_ADDR),
		      (bfd_reloc_code_real_type)
		        ((int) BFD_RELOC_UNUSED
			 + (int) operand->type));
  fixP->fx_cgen.insn = insn;
  fixP->fx_cgen.opinfo = opinfo;

  return fixP;
}

/* Used for communication between the next two procedures.  */
static jmp_buf expr_jmp_buf;
static int expr_jmp_buf_p;

/* Callback for cgen interface.  Parse the expression at *STRP.
   The result is an error message or NULL for success (in which case
   *STRP is advanced past the parsed text).
   WANT is an indication of what the caller is looking for.
   If WANT == CGEN_ASM_PARSE_INIT the caller is beginning to try to match
   a table entry with the insn, reset the queued fixups counter.
   An enum cgen_parse_operand_result is stored in RESULTP.
   OPINDEX is the operand's table entry index.
   OPINFO is something the caller chooses to help in reloc determination.
   The resulting value is stored in VALUEP.  */

const char *
gas_cgen_parse_operand (cd, want, strP, opindex, opinfo, resultP, valueP)
     CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
     enum cgen_parse_operand_type want;
     const char **strP;
     int opindex;
     int opinfo;
     enum cgen_parse_operand_result *resultP;
     bfd_vma *valueP;
{
#ifdef __STDC__
  /* These are volatile to survive the setjmp.  */
  char * volatile hold;
  enum cgen_parse_operand_result * volatile resultP_1;
#else
  static char *hold;
  static enum cgen_parse_operand_result *resultP_1;
#endif
  const char *errmsg = NULL;
  expressionS exp;

  if (want == CGEN_PARSE_OPERAND_INIT)
    {
      gas_cgen_init_parse ();
      return NULL;
    }

  resultP_1 = resultP;
  hold = input_line_pointer;
  input_line_pointer = (char *) *strP;

  /* We rely on md_operand to longjmp back to us.
     This is done via gas_cgen_md_operand.  */
  if (setjmp (expr_jmp_buf) != 0)
    {
      expr_jmp_buf_p = 0;
      input_line_pointer = (char *) hold;
      *resultP_1 = CGEN_PARSE_OPERAND_RESULT_ERROR;
      return _("illegal operand");
    }

  expr_jmp_buf_p = 1;
  expression (&exp);
  expr_jmp_buf_p = 0;

  *strP = input_line_pointer;
  input_line_pointer = hold;

  /* FIXME: Need to check `want'.  */

  switch (exp.X_op)
    {
    case O_illegal:
      errmsg = _("illegal operand");
      *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
      break;
    case O_absent:
      errmsg = _("missing operand");
      *resultP = CGEN_PARSE_OPERAND_RESULT_ERROR;
      break;
    case O_constant:
      *valueP = exp.X_add_number;
      *resultP = CGEN_PARSE_OPERAND_RESULT_NUMBER;
      break;
    case O_register:
      *valueP = exp.X_add_number;
      *resultP = CGEN_PARSE_OPERAND_RESULT_REGISTER;
      break;
    default:
      queue_fixup (opindex, opinfo, &exp);
      *valueP = 0;
      *resultP = CGEN_PARSE_OPERAND_RESULT_QUEUED;
      break;
    }

  return errmsg;
}

/* md_operand handler to catch unrecognized expressions and halt the
   parsing process so the next entry can be tried.

   ??? This could be done differently by adding code to `expression'.  */

void
gas_cgen_md_operand (expressionP)
     expressionS *expressionP ATTRIBUTE_UNUSED;
{
  /* Don't longjmp if we're not called from within cgen_parse_operand().  */
  if (expr_jmp_buf_p)
    longjmp (expr_jmp_buf, 1);
}

/* Finish assembling instruction INSN.
   BUF contains what we've built up so far.
   LENGTH is the size of the insn in bits.
   RELAX_P is non-zero if relaxable insns should be emitted as such.
   Otherwise they're emitted in non-relaxable forms.
   The "result" is stored in RESULT if non-NULL.  */

void
gas_cgen_finish_insn (insn, buf, length, relax_p, result)
     const CGEN_INSN *insn;
     CGEN_INSN_BYTES_PTR buf;
     unsigned int length;
     int relax_p;
     finished_insnS *result;
{
  int i;
  int relax_operand;
  char *f;
  unsigned int byte_len = length / 8;

  /* ??? Target foo issues various warnings here, so one might want to provide
     a hook here.  However, our caller is defined in tc-foo.c so there
     shouldn't be a need for a hook.  */

  /* Write out the instruction.
     It is important to fetch enough space in one call to `frag_more'.
     We use (f - frag_now->fr_literal) to compute where we are and we
     don't want frag_now to change between calls.

     Relaxable instructions: We need to ensure we allocate enough
     space for the largest insn.  */

  if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
    /* These currently shouldn't get here.  */
    abort ();

  /* Is there a relaxable insn with the relaxable operand needing a fixup?  */

  relax_operand = -1;
  if (relax_p && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE))
    {
      /* Scan the fixups for the operand affected by relaxing
	 (i.e. the branch address).  */

      for (i = 0; i < num_fixups; ++i)
	{
	  if (CGEN_OPERAND_ATTR_VALUE (cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex),
				       CGEN_OPERAND_RELAX))
	    {
	      relax_operand = i;
	      break;
	    }
	}
    }

  if (relax_operand != -1)
    {
      int max_len;
      fragS *old_frag;
      expressionS *exp;
      symbolS *sym;
      offsetT off;

#ifdef TC_CGEN_MAX_RELAX
      max_len = TC_CGEN_MAX_RELAX (insn, byte_len);
#else
      max_len = CGEN_MAX_INSN_SIZE;
#endif
      /* Ensure variable part and fixed part are in same fragment.  */
      /* FIXME: Having to do this seems like a hack.  */
      frag_grow (max_len);

      /* Allocate space for the fixed part.  */
      f = frag_more (byte_len);

      /* Create a relaxable fragment for this instruction.  */
      old_frag = frag_now;

      exp = &fixups[relax_operand].exp;
      sym = exp->X_add_symbol;
      off = exp->X_add_number;
      if (exp->X_op != O_constant && exp->X_op != O_symbol)
	{
	  /* Handle complex expressions.  */
	  sym = make_expr_symbol (exp);
	  off = 0;
	}

      frag_var (rs_machine_dependent,
		max_len - byte_len /* max chars */,
		0 /* variable part already allocated */,
		/* FIXME: When we machine generate the relax table,
		   machine generate a macro to compute subtype.  */
		1 /* subtype */,
		sym,
		off,
		f);

      /* Record the operand number with the fragment so md_convert_frag
	 can use gas_cgen_md_record_fixup to record the appropriate reloc.  */
      old_frag->fr_cgen.insn    = insn;
      old_frag->fr_cgen.opindex = fixups[relax_operand].opindex;
      old_frag->fr_cgen.opinfo  = fixups[relax_operand].opinfo;
      if (result)
	result->frag = old_frag;
    }
  else
    {
      f = frag_more (byte_len);
      if (result)
	result->frag = frag_now;
    }

  /* If we're recording insns as numbers (rather than a string of bytes),
     target byte order handling is deferred until now.  */
#if CGEN_INT_INSN_P
  cgen_put_insn_value (gas_cgen_cpu_desc, f, length, *buf);
#else
  memcpy (f, buf, byte_len);
#endif

  /* Emit DWARF2 debugging information.  */
  dwarf2_emit_insn (byte_len);

  /* Create any fixups.  */
  for (i = 0; i < num_fixups; ++i)
    {
      fixS *fixP;
      const CGEN_OPERAND *operand =
	cgen_operand_lookup_by_num (gas_cgen_cpu_desc, fixups[i].opindex);

      /* Don't create fixups for these.  That's done during relaxation.
	 We don't need to test for CGEN_INSN_RELAX as they can't get here
	 (see above).  */
      if (relax_p
	  && CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXABLE)
	  && CGEN_OPERAND_ATTR_VALUE (operand, CGEN_OPERAND_RELAX))
	continue;

#ifndef md_cgen_record_fixup_exp
#define md_cgen_record_fixup_exp gas_cgen_record_fixup_exp
#endif

      fixP = md_cgen_record_fixup_exp (frag_now, f - frag_now->fr_literal,
				       insn, length, operand,
				       fixups[i].opinfo,
				       &fixups[i].exp);
      if (result)
	result->fixups[i] = fixP;
    }

  if (result)
    {
      result->num_fixups = num_fixups;
      result->addr = f;
    }
}

/* Apply a fixup to the object code.  This is called for all the
   fixups we generated by the call to fix_new_exp, above.  In the call
   above we used a reloc code which was the largest legal reloc code
   plus the operand index.  Here we undo that to recover the operand
   index.  At this point all symbol values should be fully resolved,
   and we attempt to completely resolve the reloc.  If we can not do
   that, we determine the correct reloc code and put it back in the fixup.  */

/* FIXME: This function handles some of the fixups and bfd_install_relocation
   handles the rest.  bfd_install_relocation (or some other bfd function)
   should handle them all.  */

int
gas_cgen_md_apply_fix3 (fixP, valueP, seg)
     fixS *   fixP;
     valueT * valueP;
     segT     seg ATTRIBUTE_UNUSED;
{
  char *where = fixP->fx_frag->fr_literal + fixP->fx_where;
  valueT value;
  /* Canonical name, since used a lot.  */
  CGEN_CPU_DESC cd = gas_cgen_cpu_desc;

  /* FIXME FIXME FIXME: The value we are passed in *valuep includes
     the symbol values.  Since we are using BFD_ASSEMBLER, if we are
     doing this relocation the code in write.c is going to call
     bfd_install_relocation, which is also going to use the symbol
     value.  That means that if the reloc is fully resolved we want to
     use *valuep since bfd_install_relocation is not being used.
     However, if the reloc is not fully resolved we do not want to use
     *valuep, and must use fx_offset instead.  However, if the reloc
     is PC relative, we do want to use *valuep since it includes the
     result of md_pcrel_from.  This is confusing.  */

  if (fixP->fx_addsy == (symbolS *) NULL)
    {
      value = *valueP;
      fixP->fx_done = 1;
    }
  else if (fixP->fx_pcrel)
    value = *valueP;
  else
    {
      value = fixP->fx_offset;
      if (fixP->fx_subsy != (symbolS *) NULL)
	{
	  if (S_GET_SEGMENT (fixP->fx_subsy) == absolute_section)
	    value -= S_GET_VALUE (fixP->fx_subsy);
	  else
	    {
	      /* We don't actually support subtracting a symbol.  */
	      as_bad_where (fixP->fx_file, fixP->fx_line,
			    _("expression too complex"));
	    }
	}
    }

  if ((int) fixP->fx_r_type >= (int) BFD_RELOC_UNUSED)
    {
      int opindex = (int) fixP->fx_r_type - (int) BFD_RELOC_UNUSED;
      const CGEN_OPERAND *operand = cgen_operand_lookup_by_num (cd, opindex);
      const char *errmsg;
      bfd_reloc_code_real_type reloc_type;
      CGEN_FIELDS *fields = alloca (CGEN_CPU_SIZEOF_FIELDS (cd));
      const CGEN_INSN *insn = fixP->fx_cgen.insn;

      /* If the reloc has been fully resolved finish the operand here.  */
      /* FIXME: This duplicates the capabilities of code in BFD.  */
      if (fixP->fx_done
	  /* FIXME: If partial_inplace isn't set bfd_install_relocation won't
	     finish the job.  Testing for pcrel is a temporary hack.  */
	  || fixP->fx_pcrel)
	{
	  CGEN_CPU_SET_FIELDS_BITSIZE (cd) (fields, CGEN_INSN_BITSIZE (insn));
	  CGEN_CPU_SET_VMA_OPERAND (cd) (cd, opindex, fields, (bfd_vma) value);

#if CGEN_INT_INSN_P
	  {
	    CGEN_INSN_INT insn_value =
	      cgen_get_insn_value (cd, where, CGEN_INSN_BITSIZE (insn));

	    /* ??? 0 is passed for `pc'.  */
	    errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields,
						   &insn_value, (bfd_vma) 0);
	    cgen_put_insn_value (cd, where, CGEN_INSN_BITSIZE (insn),
				 insn_value);
	  }
#else
	  /* ??? 0 is passed for `pc'.  */
	  errmsg = CGEN_CPU_INSERT_OPERAND (cd) (cd, opindex, fields, where,
						 (bfd_vma) 0);
#endif
	  if (errmsg)
	    as_bad_where (fixP->fx_file, fixP->fx_line, "%s", errmsg);
	}

      if (fixP->fx_done)
	return 1;

      /* The operand isn't fully resolved.  Determine a BFD reloc value
	 based on the operand information and leave it to
	 bfd_install_relocation.  Note that this doesn't work when
	 partial_inplace == false.  */

      reloc_type = md_cgen_lookup_reloc (insn, operand, fixP);
      if (reloc_type != BFD_RELOC_NONE)
	{
	  fixP->fx_r_type = reloc_type;
	}
      else
	{
	  as_bad_where (fixP->fx_file, fixP->fx_line,
			_("unresolved expression that must be resolved"));
	  fixP->fx_done = 1;
	  return 1;
	}
    }
  else if (fixP->fx_done)
    {
      /* We're finished with this fixup.  Install it because
	 bfd_install_relocation won't be called to do it.  */
      switch (fixP->fx_r_type)
	{
	case BFD_RELOC_8:
	  md_number_to_chars (where, value, 1);
	  break;
	case BFD_RELOC_16:
	  md_number_to_chars (where, value, 2);
	  break;
	case BFD_RELOC_32:
	  md_number_to_chars (where, value, 4);
	  break;
	case BFD_RELOC_64:
	  md_number_to_chars (where, value, 8);
	  break;
	default:
	  as_bad_where (fixP->fx_file, fixP->fx_line,
			_("internal error: can't install fix for reloc type %d (`%s')"),
			fixP->fx_r_type, bfd_get_reloc_code_name (fixP->fx_r_type));
	  break;
	}
    }
  /* else
     bfd_install_relocation will be called to finish things up.  */

  /* Tuck `value' away for use by tc_gen_reloc.
     See the comment describing fx_addnumber in write.h.
     This field is misnamed (or misused :-).  */
  fixP->fx_addnumber = value;

  return 1;
}

/* Translate internal representation of relocation info to BFD target format.

   FIXME: To what extent can we get all relevant targets to use this?  */

arelent *
gas_cgen_tc_gen_reloc (section, fixP)
     asection * section ATTRIBUTE_UNUSED;
     fixS *     fixP;
{
  arelent *reloc;

  reloc = (arelent *) xmalloc (sizeof (arelent));

  reloc->howto = bfd_reloc_type_lookup (stdoutput, fixP->fx_r_type);
  if (reloc->howto == (reloc_howto_type *) NULL)
    {
      as_bad_where (fixP->fx_file, fixP->fx_line,
		    _("relocation is not supported"));
      return NULL;
    }

  assert (!fixP->fx_pcrel == !reloc->howto->pc_relative);

  reloc->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
  *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixP->fx_addsy);

  /* Use fx_offset for these cases.  */
  if (fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY
      || fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT)
    reloc->addend = fixP->fx_offset;
  else
    reloc->addend = fixP->fx_addnumber;

  reloc->address = fixP->fx_frag->fr_address + fixP->fx_where;
  return reloc;
}