aboutsummaryrefslogtreecommitdiff
path: root/gas/config/tc-mn10200.c
blob: 7a109d3f8cabec47fde1edd6750fd6c7d93c7c0c (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
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
/* tc-mn10200.c -- Assembler code for the Matsushita 10200

   Copyright (C) 1996 Free Software Foundation.

   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 <stdio.h>
#include <ctype.h>
#include "as.h"
#include "subsegs.h"     
#include "opcode/mn10200.h"

/* Structure to hold information about predefined registers.  */
struct reg_name
{
  const char *name;
  int value;
};

/* Generic assembler global variables which must be defined by all targets. */

/* Characters which always start a comment. */
const char comment_chars[] = "#";

/* Characters which start a comment at the beginning of a line.  */
const char line_comment_chars[] = ";#";

/* Characters which may be used to separate multiple commands on a 
   single line.  */
const char line_separator_chars[] = ";";

/* Characters which are used to indicate an exponent in a floating 
   point number.  */
const char EXP_CHARS[] = "eE";

/* Characters which mean that a number is a floating point constant, 
   as in 0d1.0.  */
const char FLT_CHARS[] = "dD";


/* local functions */
static void mn10200_insert_operand PARAMS ((unsigned long *, unsigned long *,
					    const struct mn10200_operand *,
					    offsetT, char *, unsigned,
					    unsigned));
static unsigned long check_operand PARAMS ((unsigned long,
					    const struct mn10200_operand *,
					    offsetT));
static int reg_name_search PARAMS ((const struct reg_name *, int, const char *));
static boolean data_register_name PARAMS ((expressionS *expressionP));
static boolean address_register_name PARAMS ((expressionS *expressionP));
static boolean other_register_name PARAMS ((expressionS *expressionP));


/* fixups */
#define MAX_INSN_FIXUPS (5)
struct mn10200_fixup
{
  expressionS exp;
  int opindex;
  bfd_reloc_code_real_type reloc;
};
struct mn10200_fixup fixups[MAX_INSN_FIXUPS];
static int fc;

const char *md_shortopts = "";
struct option md_longopts[] = {
  {NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof(md_longopts); 

/* The target specific pseudo-ops which we support.  */
const pseudo_typeS md_pseudo_table[] =
{
  { NULL,       NULL,           0 }
};

/* Opcode hash table.  */
static struct hash_control *mn10200_hash;

/* This table is sorted. Suitable for searching by a binary search. */
static const struct reg_name data_registers[] =
{
  { "d0", 0 },
  { "d1", 1 },
  { "d2", 2 },
  { "d3", 3 },
};
#define DATA_REG_NAME_CNT	(sizeof(data_registers) / sizeof(struct reg_name))

static const struct reg_name address_registers[] =
{
  { "a0", 0 },
  { "a1", 1 },
  { "a2", 2 },
  { "a3", 3 },
};
#define ADDRESS_REG_NAME_CNT	(sizeof(address_registers) / sizeof(struct reg_name))

static const struct reg_name other_registers[] =
{
  { "mdr", 0 },
  { "psw", 0 },
};
#define OTHER_REG_NAME_CNT	(sizeof(other_registers) / sizeof(struct reg_name))

/* reg_name_search does a binary search of the given register table
   to see if "name" is a valid regiter name.  Returns the register
   number from the array on success, or -1 on failure. */

static int
reg_name_search (regs, regcount, name)
     const struct reg_name *regs;
     int regcount;
     const char *name;
{
  int middle, low, high;
  int cmp;

  low = 0;
  high = regcount - 1;

  do
    {
      middle = (low + high) / 2;
      cmp = strcasecmp (name, regs[middle].name);
      if (cmp < 0)
	high = middle - 1;
      else if (cmp > 0)
	low = middle + 1;
      else 
	  return regs[middle].value;
    }
  while (low <= high);
  return -1;
}


/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */
static boolean
data_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (data_registers, DATA_REG_NAME_CNT, name);

  /* look to see if it's in the register table */
  if (reg_number >= 0) 
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* make the rest nice */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;
      *input_line_pointer = c;	/* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */
static boolean
address_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (address_registers, ADDRESS_REG_NAME_CNT, name);

  /* look to see if it's in the register table */
  if (reg_number >= 0) 
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* make the rest nice */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;
      *input_line_pointer = c;	/* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

/* Summary of register_name().
 *
 * in: Input_line_pointer points to 1st char of operand.
 *
 * out: A expressionS.
 *	The operand may have been a register: in this case, X_op == O_register,
 *	X_add_number is set to the register number, and truth is returned.
 *	Input_line_pointer->(next non-blank) char after operand, or is in
 *	its original state.
 */
static boolean
other_register_name (expressionP)
     expressionS *expressionP;
{
  int reg_number;
  char *name;
  char *start;
  char c;

  /* Find the spelling of the operand */
  start = name = input_line_pointer;

  c = get_symbol_end ();
  reg_number = reg_name_search (other_registers, OTHER_REG_NAME_CNT, name);

  /* look to see if it's in the register table */
  if (reg_number >= 0) 
    {
      expressionP->X_op = O_register;
      expressionP->X_add_number = reg_number;

      /* make the rest nice */
      expressionP->X_add_symbol = NULL;
      expressionP->X_op_symbol = NULL;
      *input_line_pointer = c;	/* put back the delimiting char */
      return true;
    }
  else
    {
      /* reset the line as if we had not done anything */
      *input_line_pointer = c;   /* put back the delimiting char */
      input_line_pointer = start; /* reset input_line pointer */
      return false;
    }
}

void
md_show_usage (stream)
  FILE *stream;
{
  fprintf(stream, "MN10200 options:\n\
none yet\n");
} 

int
md_parse_option (c, arg)
     int c;
     char *arg;
{
  return 0;
}

symbolS *
md_undefined_symbol (name)
  char *name;
{
  return 0;
}

char *
md_atof (type, litp, sizep)
  int type;
  char *litp;
  int *sizep;
{
  int prec;
  LITTLENUM_TYPE words[4];
  char *t;
  int i;

  switch (type)
    {
    case 'f':
      prec = 2;
      break;

    case 'd':
      prec = 4;
      break;

    default:
      *sizep = 0;
      return "bad call to md_atof";
    }
  
  t = atof_ieee (input_line_pointer, type, words);
  if (t)
    input_line_pointer = t;

  *sizep = prec * 2;

  for (i = prec - 1; i >= 0; i--)
    {
      md_number_to_chars (litp, (valueT) words[i], 2);
      litp += 2;
    }

  return NULL;
}


void
md_convert_frag (abfd, sec, fragP)
  bfd *abfd;
  asection *sec;
  fragS *fragP;
{
  /* printf ("call to md_convert_frag \n"); */
  abort ();
}

valueT
md_section_align (seg, addr)
     asection *seg;
     valueT addr;
{
  int align = bfd_get_section_alignment (stdoutput, seg);
  return ((addr + (1 << align) - 1) & (-1 << align));
}

void
md_begin ()
{
  char *prev_name = "";
  register const struct mn10200_opcode *op;

  mn10200_hash = hash_new();

  /* Insert unique names into hash table.  The MN10200 instruction set
     has many identical opcode names that have different opcodes based
     on the operands.  This hash table then provides a quick index to
     the first opcode with a particular name in the opcode table.  */

  op = mn10200_opcodes;
  while (op->name)
    {
      if (strcmp (prev_name, op->name)) 
	{
	  prev_name = (char *) op->name;
	  hash_insert (mn10200_hash, op->name, (char *) op);
	}
      op++;
    }

  /* This is both a simplification (we don't have to write md_apply_fix)
     and support for future optimizations (branch shortening and similar
     stuff in the linker.  */
  linkrelax = 1;
}

void
md_assemble (str) 
     char *str;
{
  char *s;
  struct mn10200_opcode *opcode;
  struct mn10200_opcode *next_opcode;
  const unsigned char *opindex_ptr;
  int next_opindex;
  unsigned long insn, extension, size = 0;
  char *f;
  int i;
  int match;

  /* Get the opcode.  */
  for (s = str; *s != '\0' && ! isspace (*s); s++)
    ;
  if (*s != '\0')
    *s++ = '\0';

  /* find the first opcode with the proper name */
  opcode = (struct mn10200_opcode *)hash_find (mn10200_hash, str);
  if (opcode == NULL)
    {
      as_bad ("Unrecognized opcode: `%s'", str);
      return;
    }

  str = s;
  while (isspace (*str))
    ++str;

  input_line_pointer = str;

  for(;;)
    {
      const char *errmsg = NULL;
      int op_idx;
      char *hold;
      int extra_shift = 0;

      fc = 0;
      match = 0;
      next_opindex = 0;
      insn = opcode->opcode;
      extension = 0;
      for (op_idx = 1, opindex_ptr = opcode->operands;
	   *opindex_ptr != 0;
	   opindex_ptr++, op_idx++)
	{
	  const struct mn10200_operand *operand;
	  expressionS ex;

	  if (next_opindex == 0)
	    {
	      operand = &mn10200_operands[*opindex_ptr];
	    }
	  else
	    {
	      operand = &mn10200_operands[next_opindex];
	      next_opindex = 0;
	    }

	  errmsg = NULL;

	  while (*str == ' ' || *str == ',')
	    ++str;

	  /* Gather the operand. */
	  hold = input_line_pointer;
	  input_line_pointer = str;

	  if (operand->flags & MN10200_OPERAND_PAREN)
	    {
	      if (*input_line_pointer != ')' && *input_line_pointer != '(')
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
	      input_line_pointer++;
	      goto keep_going;
	    }
	  /* See if we can match the operands.  */
	  else if (operand->flags & MN10200_OPERAND_DREG)
	    {
	      if (!data_register_name (&ex))
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
	    }
	  else if (operand->flags & MN10200_OPERAND_AREG)
	    {
	      if (!address_register_name (&ex))
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
	    }
	  else if (operand->flags & MN10200_OPERAND_PSW)
	    {
	      char *start = input_line_pointer;
	      char c = get_symbol_end ();

	      if (strcmp (start, "psw") != 0)
		{
		  *input_line_pointer = c;
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
	      *input_line_pointer = c;
	      goto keep_going;
	    }
	  else if (operand->flags & MN10200_OPERAND_MDR)
	    {
	      char *start = input_line_pointer;
	      char c = get_symbol_end ();

	      if (strcmp (start, "mdr") != 0)
		{
		  *input_line_pointer = c;
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
	      *input_line_pointer = c;
	      goto keep_going;
	    }
	  else if (data_register_name (&ex))
	    {
	      input_line_pointer = hold;
	      str = hold;
	      goto error;
	    }
	  else if (address_register_name (&ex))
	    {
	      input_line_pointer = hold;
	      str = hold;
	      goto error;
	    }
	  else if (other_register_name (&ex))
	    {
	      input_line_pointer = hold;
	      str = hold;
	      goto error;
	    }
	  else if (*str == ')' || *str == '(')
	    {
	      input_line_pointer = hold;
	      str = hold;
	      goto error;
	    }
	  else
	    {
	      expression (&ex);
	    }

	  switch (ex.X_op) 
	    {
	    case O_illegal:
	      errmsg = "illegal operand";
	      goto error;
	    case O_absent:
	      errmsg = "missing operand";
	      goto error;
	    case O_register:
	      if ((operand->flags
                   & (MN10200_OPERAND_DREG | MN10200_OPERAND_AREG)) == 0)
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}
		
	      if (opcode->format == FMT_2 || opcode->format == FMT_5)
		extra_shift = 8;
	      else if (opcode->format == FMT_3 || opcode->format == FMT_6
		       || opcode->format == FMT_7)
		extra_shift = 16;
	      else
		extra_shift = 0;
	      
	      mn10200_insert_operand (&insn, &extension, operand,
				      ex.X_add_number, (char *) NULL,
				      0, extra_shift);

	      break;

	    case O_constant:
	      /* If this operand can be promoted, and it doesn't
		 fit into the allocated bitfield for this insn,
		 then promote it (ie this opcode does not match).  */
	      if (operand->flags & MN10200_OPERAND_PROMOTE
		  && ! check_operand (insn, operand, ex.X_add_number))
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}

	      mn10200_insert_operand (&insn, &extension, operand,
				      ex.X_add_number, (char *) NULL,
				      0, 0);
	      break;

	    default:
	      /* If this operand can be promoted, then this opcode didn't
		 match since we can't know if it needed promotion!  */
	      if (operand->flags & MN10200_OPERAND_PROMOTE)
		{
		  input_line_pointer = hold;
		  str = hold;
		  goto error;
		}

	      /* We need to generate a fixup for this expression.  */
	      if (fc >= MAX_INSN_FIXUPS)
		as_fatal ("too many fixups");
	      fixups[fc].exp = ex;
	      fixups[fc].opindex = *opindex_ptr;
	      fixups[fc].reloc = BFD_RELOC_UNUSED;
	      ++fc;
	      break;
	    }

keep_going:
	  str = input_line_pointer;
	  input_line_pointer = hold;

	  while (*str == ' ' || *str == ',')
	    ++str;

	}

      /* Make sure we used all the operands!  */
      if (*str != ',')
	match = 1;

    error:
      if (match == 0)
        {
	  next_opcode = opcode + 1;
	  if (!strcmp(next_opcode->name, opcode->name))
	    {
	      opcode = next_opcode;
	      continue;
	    }
	  
	  as_bad ("%s", errmsg);
	  return;
        }
      break;
    }
      
  while (isspace (*str))
    ++str;

  if (*str != '\0')
    as_bad ("junk at end of line: `%s'", str);

  input_line_pointer = str;

  if (opcode->format == FMT_1)
    size = 1;
  else if (opcode->format == FMT_2 || opcode->format == FMT_4)
    size = 2;
  else if (opcode->format == FMT_3 || opcode->format == FMT_5)
    size = 3;
  else if (opcode->format == FMT_6)
    size = 4;
  else if (opcode->format == FMT_7)
    size = 5;
  else
    abort ();
         
  /* Write out the instruction.  */

  f = frag_more (size);

  /* Oh, what a mess.  The instruction is in big endian format, but
     16 and 24bit immediates are little endian!  */
  if (opcode->format == FMT_3)
    {
      number_to_chars_bigendian (f, (insn >> 16) & 0xff, 1);
      number_to_chars_littleendian (f + 1, insn & 0xffff, 2);
    }
  else if (opcode->format == FMT_6)
    {
      number_to_chars_bigendian (f, (insn >> 16) & 0xffff, 2);
      number_to_chars_littleendian (f + 2, insn & 0xffff, 2);
    }
  else if (opcode->format == FMT_7)
    {
      number_to_chars_bigendian (f, (insn >> 16) & 0xffff, 2);
      number_to_chars_littleendian (f + 2, insn & 0xffff, 2);
      number_to_chars_littleendian (f + 4, extension & 0xff, 1);
    }
  else
    {
      number_to_chars_bigendian (f, insn, size > 4 ? 4 : size);
    }

  /* Create any fixups.  */
  for (i = 0; i < fc; i++)
    {
      const struct mn10200_operand *operand;

      operand = &mn10200_operands[fixups[i].opindex];
      if (fixups[i].reloc != BFD_RELOC_UNUSED)
	{
	  reloc_howto_type *reloc_howto;
	  int size;
	  int offset;
	  fixS *fixP;

	  reloc_howto = bfd_reloc_type_lookup (stdoutput, fixups[i].reloc);

	  if (!reloc_howto)
	    abort();
	  
	  size = bfd_get_reloc_size (reloc_howto);

	  if (size < 1 || size > 4)
	    abort();

	  offset = 4 - size;
	  fixP = fix_new_exp (frag_now, f - frag_now->fr_literal + offset, size,
			      &fixups[i].exp, 
			      reloc_howto->pc_relative,
			      fixups[i].reloc);
	}
      else
	{
	  int reloc, pcrel, reloc_size, offset;

	  reloc = BFD_RELOC_NONE;
	  /* How big is the reloc?  Remember SPLIT relocs are
	     implicitly 32bits.  */
	  reloc_size = operand->bits;

	  offset = size - reloc_size / 8;

	  /* Is the reloc pc-relative?  */
	  pcrel = (operand->flags & MN10200_OPERAND_PCREL) != 0;


	  /* Choose a proper BFD relocation type.  */
	  if (pcrel)
	    {
	      if (reloc_size == 8)
		reloc = BFD_RELOC_8_PCREL;
	      else if (reloc_size == 24)
		reloc = BFD_RELOC_24_PCREL;
	      else
		abort ();
	    }
	  else
	    {
	      if (reloc_size == 32)
		reloc = BFD_RELOC_32;
	      else if (reloc_size == 16)
		reloc = BFD_RELOC_16;
	      else if (reloc_size == 8)
		reloc = BFD_RELOC_8;
	      else if (reloc_size == 24)
		reloc = BFD_RELOC_24;
	      else
		abort ();
	    }

	  /* Convert the size of the reloc into what fix_new_exp wants.  */
	  reloc_size = reloc_size / 8;
	  if (reloc_size == 8)
	    reloc_size = 0;
	  else if (reloc_size == 16)
	    reloc_size = 1;
	  else if (reloc_size == 32 || reloc_size == 24)
	    reloc_size = 2;

	  fix_new_exp (frag_now, f - frag_now->fr_literal + offset, reloc_size,
		       &fixups[i].exp, pcrel,
		       ((bfd_reloc_code_real_type) reloc));
	}
    }
}


/* if while processing a fixup, a reloc really needs to be created */
/* then it is done here */
                 
arelent *
tc_gen_reloc (seg, fixp)
     asection *seg;
     fixS *fixp;
{
  arelent *reloc;
  reloc = (arelent *) bfd_alloc_by_size_t (stdoutput, sizeof (arelent));
  reloc->sym_ptr_ptr = &fixp->fx_addsy->bsym;
  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
  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,
                    "reloc %d not supported by object file format", (int)fixp->fx_r_type);
      return NULL;
    }
  reloc->addend = fixp->fx_offset;
  /*  printf("tc_gen_reloc: addr=%x  addend=%x\n", reloc->address, reloc->addend); */
  return reloc;
}

int
md_estimate_size_before_relax (fragp, seg)
     fragS *fragp;
     asection *seg;
{
  return 0;
} 

long
md_pcrel_from (fixp)
     fixS *fixp;
{
  return fixp->fx_frag->fr_address;
#if 0
  if (fixp->fx_addsy != (symbolS *) NULL && ! S_IS_DEFINED (fixp->fx_addsy))
    {
      /* The symbol is undefined.  Let the linker figure it out.  */
      return 0;
    }
  return fixp->fx_frag->fr_address + fixp->fx_where;
#endif
}

int
md_apply_fix3 (fixp, valuep, seg)
     fixS *fixp;
     valueT *valuep;
     segT seg;
{
  /* We shouldn't ever get here because linkrelax is nonzero.  */
  abort ();
  fixp->fx_done = 1;
  return 0;
}

/* Insert an operand value into an instruction.  */

static void
mn10200_insert_operand (insnp, extensionp, operand, val, file, line, shift)
     unsigned long *insnp;
     unsigned long *extensionp;
     const struct mn10200_operand *operand;
     offsetT val;
     char *file;
     unsigned int line;
     unsigned int shift;
{
  /* No need to check 24 or 32bit operands for a bit.  */
  if (operand->bits < 24
      && (operand->flags & MN10200_OPERAND_NOCHECK) == 0)
    {
      long min, max;
      offsetT test;

      if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
	{
	  max = (1 << (operand->bits - 1)) - 1;
	  min = - (1 << (operand->bits - 1));
	}
      else
        {
          max = (1 << operand->bits) - 1;
          min = 0;
        }

      test = val;


      if (test < (offsetT) min || test > (offsetT) max)
        {
          const char *err =
            "operand out of range (%s not between %ld and %ld)";
          char buf[100];

          sprint_value (buf, test);
          if (file == (char *) NULL)
            as_warn (err, buf, min, max);
          else
            as_warn_where (file, line, err, buf, min, max);
        }
    }

  if ((operand->flags & MN10200_OPERAND_EXTENDED) == 0)
    {
      *insnp |= (((long) val & ((1 << operand->bits) - 1))
		 << (operand->shift + shift));

      if ((operand->flags & MN10200_OPERAND_REPEATED) != 0)
	*insnp |= (((long) val & ((1 << operand->bits) - 1))
		   << (operand->shift + shift + 2));
    }
  else
    {
      *extensionp |= (val >> 16) & 0xff;
      *insnp |= val & 0xffff;
    }
}

static unsigned long
check_operand (insn, operand, val)
     unsigned long insn;
     const struct mn10200_operand *operand;
     offsetT val;
{
  /* No need to check 24bit or 32bit operands for a bit.  */
  if (operand->bits < 24
      && (operand->flags & MN10200_OPERAND_NOCHECK) == 0)
    {
      long min, max;
      offsetT test;

      if ((operand->flags & MN10200_OPERAND_SIGNED) != 0)
	{
	  max = (1 << (operand->bits - 1)) - 1;
	  min = - (1 << (operand->bits - 1));
	}
      else
        {
          max = (1 << operand->bits) - 1;
          min = 0;
        }

      test = val;


      if (test < (offsetT) min || test > (offsetT) max)
	return 0;
      else
	return 1;
    }
  return 1;
}