aboutsummaryrefslogtreecommitdiff
path: root/gas/config/tc-or32.c
blob: 7e7e6636975fdc9266ee63792cbdd8ffb63be151 (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
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
/* Assembly backend for the OpenRISC 1000.
   Copyright (C) 2002, 2003, 2005, 2007, 2009
   Free Software Foundation, Inc.
   Contributed by Damjan Lampret <lampret@opencores.org>.
   Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>.
   Based upon a29k port.

   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 3, 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, 51 Franklin Street - Fifth Floor,
   Boston, MA 02110-1301, USA.  */

/* tc-a29k.c used as a template.  */

#include "safe-ctype.h"
#include "as.h"
#include "opcode/or32.h"
#include "elf/or32.h"

#define DEBUG 0

#ifndef REGISTER_PREFIX
#define REGISTER_PREFIX   '%'
#endif

/* Make it easier to clone this machine desc into another one.  */
#define machine_opcode  or32_opcode
#define machine_opcodes or32_opcodes
#define machine_ip      or32_ip
#define machine_it      or32_it

/* Handle of the OPCODE hash table.  */
static struct hash_control *op_hash = NULL;

struct machine_it
{
  char *          error;
  unsigned long   opcode;
  struct nlist *  nlistp;
  expressionS     exp;
  int             pcrel;
  int             reloc_offset;   /* Offset of reloc within insn.  */
  int             reloc;
}
the_insn;

const pseudo_typeS md_pseudo_table[] =
{
  {"align",   s_align_bytes,  4 },
  {"space",   s_space,        0 },
  {"cputype", s_ignore,       0 },
  {"reg",     s_lsym,         0 },  /* Register equate, same as equ.  */
  {"sect",    s_ignore,       0 },  /* Creation of coff sections.  */
  {"proc",    s_ignore,       0 },  /* Start of a function.  */
  {"endproc", s_ignore,       0 },  /* Function end.  */
  {"word",    cons,           4 },
  {NULL,      0,              0 },
};

int md_short_jump_size  = 4;
int md_long_jump_size   = 4;

/* This array holds the chars that always start a comment.
   If the pre-processor is disabled, these aren't very useful.  */
const char comment_chars[] = "#";

/* This array holds the chars that only start a comment at the beginning of
   a line.  If the line seems to have the form '# 123 filename'
   .line and .file directives will appear in the pre-processed output.  */
/* Note that input_file.c hand checks for '#' at the beginning of the
   first line of the input file.  This is because the compiler outputs
   #NO_APP at the beginning of its output.  */
/* Also note that comments like this one will always work.  */
const char line_comment_chars[] = "#";

/* We needed an unused char for line separation to work around the
   lack of macros, using sed and such.  */
const char line_separator_chars[] = ";";

/* Chars that can be used to separate mant from exp in floating point nums.  */
const char EXP_CHARS[] = "eE";

/* Chars that mean this number is a floating point constant.
   As in 0f12.456
   or    0d1.2345e12.  */
const char FLT_CHARS[] = "rRsSfFdDxXpP";

/* "l.jalr r9" precalculated opcode.  */
static unsigned long jalr_r9_opcode;

static void machine_ip (char *);


/* Set bits in machine opcode according to insn->encoding
   description and passed operand.  */

static void
encode (const struct machine_opcode *insn,
	unsigned long *opcode,
	signed long param_val,
	char param_ch)
{
  int opc_pos = 0;
  int param_pos = 0;
  char *enc;

#if DEBUG
  printf ("    encode:  opcode=%.8lx  param_val=%.8lx abs=%.8lx param_ch=%c\n",
	  *opcode, param_val, abs (param_val), param_ch);
#endif
  for (enc = insn->encoding; *enc != '\0'; enc++)
    if (*enc == param_ch)
      {
	if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
	  continue;
	else
	  param_pos ++;
      }

  opc_pos = 32;

  for (enc = insn->encoding; *enc != '\0';)
    {
      if ((*enc == '0') && (*(enc + 1) == 'x'))
	{
	  int tmp = strtol (enc, NULL, 16);

	  opc_pos -= 4;
	  *opcode |= tmp << opc_pos;
	  enc += 3;
	}
      else if ((*enc == '0') || (*enc == '-'))
	{
	  opc_pos--;
	  enc++;
	}
      else if (*enc == '1')
	{
	  opc_pos--;
	  *opcode |= 1 << opc_pos;
	  enc++;
	}
      else if (*enc == param_ch)
	{
	  opc_pos--;
	  param_pos--;
	  *opcode |= ((param_val >> param_pos) & 0x1) << opc_pos;
	  enc++;
	}
      else if (ISALPHA (*enc))
	{
	  opc_pos--;
	  enc++;
	}
      else
	enc++;
    }

#if DEBUG
  printf ("    opcode=%.8lx\n", *opcode);
#endif
}

/* This function is called once, at assembler startup time.  It should
   set up all the tables, etc., that the MD part of the assembler will
   need.  */

void
md_begin (void)
{
  const char *retval = NULL;
  int lose = 0;
  int skipnext = 0;
  unsigned int i;

  /* Hash up all the opcodes for fast use later.  */
  op_hash = hash_new ();

  for (i = 0; i < or32_num_opcodes; i++)
    {
      const char *name = machine_opcodes[i].name;

      if (skipnext)
        {
          skipnext = 0;
          continue;
        }

      retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]);
      if (retval != NULL)
        {
          fprintf (stderr, "internal error: can't hash `%s': %s\n",
                   machine_opcodes[i].name, retval);
          lose = 1;
        }
    }

  if (lose)
    as_fatal (_("Broken assembler.  No assembly attempted."));

  encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B');
}

/* Returns non zero if instruction is to be used.  */

static int
check_invalid_opcode (unsigned long opcode)
{
  return opcode == jalr_r9_opcode;
}

/* Assemble a single instruction.  Its label has already been handled
   by the generic front end.  We just parse opcode and operands, and
   produce the bytes of data and relocation.  */

void
md_assemble (char *str)
{
  char *toP;

#if DEBUG
  printf ("NEW INSTRUCTION\n");
#endif

  know (str);
  machine_ip (str);
  toP = frag_more (4);

  /* Put out the opcode.  */
  md_number_to_chars (toP, the_insn.opcode, 4);

  /* Put out the symbol-dependent stuff.  */
  if (the_insn.reloc != BFD_RELOC_NONE)
    {
      fix_new_exp (frag_now,
                   (toP - frag_now->fr_literal + the_insn.reloc_offset),
                   4,   /* size */
                   &the_insn.exp,
                   the_insn.pcrel,
                   the_insn.reloc);
    }
}

/* This is true of the we have issued a "lo(" or "hi"(.  */
static int waiting_for_shift = 0;

static int mask_or_shift = 0;

static char *
parse_operand (char *s, expressionS *operandp, int opt)
{
  char *save = input_line_pointer;
  char *new_pointer;

#if DEBUG
  printf ("  PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt);
#endif

  input_line_pointer = s;

  if (strncasecmp (s, "HI(", 3) == 0)
    {
      waiting_for_shift = 1;
      mask_or_shift = BFD_RELOC_HI16;

      input_line_pointer += 3;
    }
  else if (strncasecmp (s, "LO(", 3) == 0)
    {
      mask_or_shift = BFD_RELOC_LO16;

      input_line_pointer += 3;
    }
  else
    mask_or_shift = 0;

  if ((*s == '(') && (*(s+1) == 'r'))
    s++;

  if ((*s == 'r') && ISDIGIT (*(s + 1)))
    {
      operandp->X_add_number = strtol (s + 1, NULL, 10);
      operandp->X_op = O_register;
      for (; (*s != ',') && (*s != '\0');)
        s++;
      input_line_pointer = save;
      return s;
    }

  expression (operandp);

  if (operandp->X_op == O_absent)
    {
      if (! opt)
        as_bad (_("missing operand"));
      else
        {
          operandp->X_add_number = 0;
          operandp->X_op = O_constant;
        }
    }

  new_pointer = input_line_pointer;
  input_line_pointer = save;

#if DEBUG
  printf ("  %s=parse_operand(%s): operandp->X_op = %u\n", new_pointer, s,
          operandp->X_op);
#endif

  return new_pointer;
}

/* Instruction parsing.  Takes a string containing the opcode.
   Operands are at input_line_pointer.  Output is in the_insn.
   Warnings or errors are generated.  */

static void
machine_ip (char *str)
{
  char *s;
  const char *args;
  const struct machine_opcode *insn;
  char *argsStart;
  unsigned long opcode;
  expressionS the_operand;
  expressionS *operand = &the_operand;
  unsigned int regno;
  int reloc = BFD_RELOC_NONE;

#if DEBUG
  printf ("machine_ip(%s)\n", str);
#endif

  s = str;
  for (; ISALNUM (*s) || *s == '.'; ++s)
    if (ISUPPER (*s))
      *s = TOLOWER (*s);

  switch (*s)
    {
    case '\0':
      break;

    case ' ':     /* FIXME-SOMEDAY more whitespace.  */
      *s++ = '\0';
      break;

    default:
      as_bad (_("unknown opcode1: `%s'"), str);
      return;
    }

  if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
    {
      as_bad (_("unknown opcode2 `%s'."), str);
      return;
    }

  argsStart = s;
  opcode = 0;
  memset (&the_insn, '\0', sizeof (the_insn));
  the_insn.reloc = BFD_RELOC_NONE;

  reloc = BFD_RELOC_NONE;

  /* Build the opcode, checking as we go to make sure that the
     operands match.

     If an operand matches, we modify the_insn or opcode appropriately,
     and do a "continue".  If an operand fails to match, we "break".  */
  if (insn->args[0] != '\0')
    /* Prime the pump.  */
    s = parse_operand (s, operand, insn->args[0] == 'I');

  for (args = insn->args;; ++args)
    {
#if DEBUG
      printf ("  args = %s\n", args);
#endif
      switch (*args)
        {
        case '\0':    /* End of args.  */
          /* We have have 0 args, do the bazoooka!  */
          if (args == insn->args)
	    encode (insn, &opcode, 0, 0);

          if (*s == '\0')
            {
              /* We are truly done.  */
              the_insn.opcode = opcode;
              if (check_invalid_opcode (opcode))
                as_bad (_("instruction not allowed: %s"), str);
              return;
            }
          as_bad (_("too many operands: %s"), s);
          break;

        case ',':   /* Must match a comma.  */
          if (*s++ == ',')
            {
              reloc = BFD_RELOC_NONE;

              /* Parse next operand.  */
              s = parse_operand (s, operand, args[1] == 'I');
#if DEBUG
	      printf ("    ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n",
		      operand->X_add_number, args, s);
#endif
              continue;
            }
          break;

        case '(':   /* Must match a (.  */
          s = parse_operand (s, operand, args[1] == 'I');
          continue;

        case ')':   /* Must match a ).  */
          continue;

        case 'r':   /* A general register.  */
          args++;

          if (operand->X_op != O_register)
            break;    /* Only registers.  */

          know (operand->X_add_symbol == 0);
          know (operand->X_op_symbol == 0);
          regno = operand->X_add_number;
          encode (insn, &opcode, regno, *args);
#if DEBUG
          printf ("    r: operand->X_op = %d\n", operand->X_op);
#endif
          continue;

        default:
          /* if (! ISALPHA (*args))
               break;  */   /* Only immediate values.  */

          if (mask_or_shift)
	    {
#if DEBUG
	      printf ("mask_or_shift = %d\n", mask_or_shift);
#endif
	      reloc = mask_or_shift;
	    }
          mask_or_shift = 0;

          if (strncasecmp (args, "LO(", 3) == 0)
            {
#if DEBUG
              printf ("reloc_const\n");
#endif
              reloc = BFD_RELOC_LO16;
            }
          else if (strncasecmp (args, "HI(", 3) == 0)
            {
#if DEBUG
              printf ("reloc_consth\n");
#endif
              reloc = BFD_RELOC_HI16;
            }

          if (*s == '(')
	    operand->X_op = O_constant;
          else if (*s == ')')
            s += 1;
#if DEBUG
          printf ("    default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s);
#endif
          if (operand->X_op == O_constant)
            {
	      if (reloc == BFD_RELOC_NONE)
		{
		  bfd_vma v, mask;

		  mask = 0x3ffffff;
		  v = abs (operand->X_add_number) & ~ mask;
		  if (v)
		    as_bad (_("call/jmp target out of range (1)"));
		}

              if (reloc == BFD_RELOC_HI16)
		operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff);

              the_insn.pcrel = 0;
              encode (insn, &opcode, operand->X_add_number, *args);
 /*             the_insn.reloc = BFD_RELOC_NONE; */
              continue;
            }

          if (reloc == BFD_RELOC_NONE)
            the_insn.reloc = BFD_RELOC_32_GOT_PCREL;
          else
            the_insn.reloc = reloc;

          /* the_insn.reloc = insn->reloc;  */
#if DEBUG
          printf ("    reloc sym=%d\n", the_insn.reloc);
          printf ("    BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE);
#endif
          the_insn.exp = *operand;

          /*  the_insn.reloc_offset = 1;  */
          the_insn.pcrel = 1; /* Assume PC-relative jump.  */

          /* FIXME-SOON, Do we figure out whether abs later, after
             know sym val?  */
          if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16)
            the_insn.pcrel = 0;

          encode (insn, &opcode, operand->X_add_number, *args);
          continue;
        }

      /* Types or values of args don't match.  */
      as_bad (_("invalid operands"));
      return;
    }
}

char *
md_atof (int type, char * litP, int *  sizeP)
{
  return ieee_md_atof (type, litP, sizeP, TRUE);
}

/* Write out big-endian.  */

void
md_number_to_chars (char *buf, valueT val, int n)
{
  number_to_chars_bigendian (buf, val, n);
}

void
md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
{
  char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
  long t_val;

  t_val = (long) *val;

#if DEBUG
  printf ("md_apply_fix val:%x\n", t_val);
#endif

  fixP->fx_addnumber = t_val; /* Remember value for emit_reloc.  */

  switch (fixP->fx_r_type)
    {
    case BFD_RELOC_32:      /* XXXXXXXX pattern in a word.  */
#if DEBUG
      printf ("reloc_const: val=%x\n", t_val);
#endif
      buf[0] = t_val >> 24;
      buf[1] = t_val >> 16;
      buf[2] = t_val >> 8;
      buf[3] = t_val;
      break;

    case BFD_RELOC_16:      /* XXXX0000 pattern in a word.  */
#if DEBUG
      printf ("reloc_const: val=%x\n", t_val);
#endif
      buf[0] = t_val >> 8;
      buf[1] = t_val;
      break;

    case BFD_RELOC_8:      /* XX000000 pattern in a word.  */
#if DEBUG
      printf ("reloc_const: val=%x\n", t_val);
#endif
      buf[0] = t_val;
      break;

    case BFD_RELOC_LO16:      /* 0000XXXX pattern in a word.  */
#if DEBUG
      printf ("reloc_const: val=%x\n", t_val);
#endif
      buf[2] = t_val >> 8;  /* Holds bits 0000XXXX.  */
      buf[3] = t_val;
      break;

    case BFD_RELOC_HI16:    /* 0000XXXX pattern in a word.  */
#if DEBUG
      printf ("reloc_consth: val=%x\n", t_val);
#endif
      buf[2] = t_val >> 24; /* Holds bits XXXX0000.  */
      buf[3] = t_val >> 16;
      break;

    case BFD_RELOC_32_GOT_PCREL:  /* 0000XXXX pattern in a word.  */
      if (!fixP->fx_done)
        ;
      else if (fixP->fx_pcrel)
        {
          long v = t_val >> 28;

          if (v != 0 && v != -1)
            as_bad_where (fixP->fx_file, fixP->fx_line,
                          _("call/jmp target out of range (2)"));
        }
      else
        /* This case was supposed to be handled in machine_ip.  */
        abort ();

      buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address.  */
      buf[1] = t_val >> 18;
      buf[2] = t_val >> 10;
      buf[3] = t_val >> 2;
      break;

    case BFD_RELOC_VTABLE_INHERIT:
    case BFD_RELOC_VTABLE_ENTRY:
      fixP->fx_done = 0;
      break;

    case BFD_RELOC_NONE:
    default:
      as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
      break;
    }

  if (fixP->fx_addsy == (symbolS *) NULL)
    fixP->fx_done = 1;
}

/* Should never be called for or32.  */

void
md_create_short_jump (char *    ptr       ATTRIBUTE_UNUSED,
		      addressT  from_addr ATTRIBUTE_UNUSED,
		      addressT  to_addr   ATTRIBUTE_UNUSED,
		      fragS *   frag      ATTRIBUTE_UNUSED,
		      symbolS * to_symbol ATTRIBUTE_UNUSED)
{
  as_fatal ("or32_create_short_jmp\n");
}

/* Should never be called for or32.  */

void
md_convert_frag (bfd *   headers ATTRIBUTE_UNUSED,
		 segT    seg     ATTRIBUTE_UNUSED,
		 fragS * fragP   ATTRIBUTE_UNUSED)
{
  as_fatal ("or32_convert_frag\n");
}

/* Should never be called for or32.  */

void
md_create_long_jump (char *    ptr       ATTRIBUTE_UNUSED,
		     addressT  from_addr ATTRIBUTE_UNUSED,
		     addressT  to_addr   ATTRIBUTE_UNUSED,
		     fragS *   frag      ATTRIBUTE_UNUSED,
		     symbolS * to_symbol ATTRIBUTE_UNUSED)
{
  as_fatal ("or32_create_long_jump\n");
}

/* Should never be called for or32.  */

int
md_estimate_size_before_relax (fragS * fragP   ATTRIBUTE_UNUSED,
			       segT    segtype ATTRIBUTE_UNUSED)
{
  as_fatal ("or32_estimate_size_before_relax\n");
  return 0;
}

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

   On sparc/29k: first 4 bytes are normal unsigned long address, next three
   bytes are index, most sig. byte first.  Byte 7 is broken up with
   bit 7 as external, bits 6 & 5 unused, and the lower
   five bits as relocation type.  Next 4 bytes are long addend.  */
/* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com.  */

#ifdef OBJ_AOUT
void
tc_aout_fix_to_chars (char *where,
		      fixS *fixP,
		      relax_addressT segment_address_in_file)
{
  long r_symbolnum;

#if DEBUG
  printf ("tc_aout_fix_to_chars\n");
#endif

  know (fixP->fx_r_type < BFD_RELOC_NONE);
  know (fixP->fx_addsy != NULL);

  md_number_to_chars
    (where,
     fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
     4);

  r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
     ? S_GET_TYPE (fixP->fx_addsy)
     : fixP->fx_addsy->sy_number);

  where[4] = (r_symbolnum >> 16) & 0x0ff;
  where[5] = (r_symbolnum >> 8) & 0x0ff;
  where[6] = r_symbolnum & 0x0ff;
  where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);

  /* Also easy.  */
  md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
}

#endif /* OBJ_AOUT */

const char *md_shortopts = "";

struct option md_longopts[] =
{
  { NULL, no_argument, NULL, 0 }
};
size_t md_longopts_size = sizeof (md_longopts);

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

void
md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
{
}

/* This is called when a line is unrecognized.  This is used to handle
   definitions of or32 style local labels.  */

int
or32_unrecognized_line (int c)
{
  int lab;
  char *s;

  if (c != '$'
      || ! ISDIGIT ((unsigned char) input_line_pointer[0]))
    return 0;

  s = input_line_pointer;

  lab = 0;
  while (ISDIGIT ((unsigned char) *s))
    {
      lab = lab * 10 + *s - '0';
      ++s;
    }

  if (*s != ':')
    /* Not a label definition.  */
    return 0;

  if (dollar_label_defined (lab))
    {
      as_bad (_("label \"$%d\" redefined"), lab);
      return 0;
    }

  define_dollar_label (lab);
  colon (dollar_label_name (lab, 0));
  input_line_pointer = s + 1;

  return 1;
}

/* Default the values of symbols known that should be "predefined".  We
   don't bother to predefine them unless you actually use one, since there
   are a lot of them.  */

symbolS *
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
{
  return NULL;
}

/* Parse an operand that is machine-specific.  */

void
md_operand (expressionS *expressionP)
{
#if DEBUG
  printf ("  md_operand(input_line_pointer = %s)\n", input_line_pointer);
#endif

  if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
    {
      /* We have a numeric register expression.  No biggy.  */
      input_line_pointer += 2;  /* Skip %r */
      (void) expression (expressionP);

      if (expressionP->X_op != O_constant
          || expressionP->X_add_number > 255)
        as_bad (_("Invalid expression after %%%%\n"));
      expressionP->X_op = O_register;
    }
  else if (input_line_pointer[0] == '&')
    {
      /* We are taking the 'address' of a register...this one is not
         in the manual, but it *is* in traps/fpsymbol.h!  What they
         seem to want is the register number, as an absolute number.  */
      input_line_pointer++; /* Skip & */
      (void) expression (expressionP);

      if (expressionP->X_op != O_register)
        as_bad (_("invalid register in & expression"));
      else
        expressionP->X_op = O_constant;
    }
  else if (input_line_pointer[0] == '$'
           && ISDIGIT ((unsigned char) input_line_pointer[1]))
    {
      long lab;
      char *name;
      symbolS *sym;

      /* This is a local label.  */
      ++input_line_pointer;
      lab = (long) get_absolute_expression ();

      if (dollar_label_defined (lab))
        {
          name = dollar_label_name (lab, 0);
          sym = symbol_find (name);
        }
      else
        {
          name = dollar_label_name (lab, 1);
          sym = symbol_find_or_make (name);
        }

      expressionP->X_op = O_symbol;
      expressionP->X_add_symbol = sym;
      expressionP->X_add_number = 0;
    }
  else if (input_line_pointer[0] == '$')
    {
      char *s;
      char type;
      int fieldnum, fieldlimit;
      LITTLENUM_TYPE floatbuf[8];

      /* $float(), $doubleN(), or $extendN() convert floating values
         to integers.  */
      s = input_line_pointer;

      ++s;

      fieldnum = 0;
      if (strncmp (s, "double", sizeof "double" - 1) == 0)
        {
          s += sizeof "double" - 1;
          type = 'd';
          fieldlimit = 2;
        }
      else if (strncmp (s, "float", sizeof "float" - 1) == 0)
        {
          s += sizeof "float" - 1;
          type = 'f';
          fieldlimit = 1;
        }
      else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
        {
          s += sizeof "extend" - 1;
          type = 'x';
          fieldlimit = 4;
        }
      else
	return;

      if (ISDIGIT (*s))
        {
          fieldnum = *s - '0';
          ++s;
        }
      if (fieldnum >= fieldlimit)
        return;

      SKIP_WHITESPACE ();
      if (*s != '(')
        return;
      ++s;
      SKIP_WHITESPACE ();

      s = atof_ieee (s, type, floatbuf);
      if (s == NULL)
        return;
      s = s;

      SKIP_WHITESPACE ();
      if (*s != ')')
        return;
      ++s;
      SKIP_WHITESPACE ();

      input_line_pointer = s;
      expressionP->X_op = O_constant;
      expressionP->X_unsigned = 1;
      expressionP->X_add_number = ((floatbuf[fieldnum * 2]
                                    << LITTLENUM_NUMBER_OF_BITS)
                                   + floatbuf[fieldnum * 2 + 1]);
    }
}

/* Round up a section size to the appropriate boundary.  */

valueT
md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
{
  return size;      /* Byte alignment is fine.  */
}

/* Exactly what point is a PC-relative offset relative TO?
   On the 29000, they're relative to the address of the instruction,
   which we have set up as the address of the fixup too.  */

long
md_pcrel_from (fixS *fixP)
{
  return fixP->fx_where + fixP->fx_frag->fr_address;
}

/* Generate a reloc for a fixup.  */

arelent *
tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
{
  arelent *reloc;

  reloc = xmalloc (sizeof (arelent));
  reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
  *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
  /*  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
  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;
    }

  if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
    reloc->address = fixp->fx_offset;

  reloc->addend = fixp->fx_addnumber;
  return reloc;
}