1/* Assembly backend for the OpenRISC 1000.
2   Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
3   Contributed by Damjan Lampret <lampret@opencores.org>.
4   Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>.
5   Based upon a29k port.
6
7   This file is part of GAS, the GNU Assembler.
8
9   GAS is free software; you can redistribute it and/or modify
10   it under the terms of the GNU General Public License as published by
11   the Free Software Foundation; either version 2, or (at your option)
12   any later version.
13
14   GAS is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License for more details.
18
19   You should have received a copy of the GNU General Public License
20   along with GAS; see the file COPYING.  If not, write to
21   the Free Software Foundation, 51 Franklin Street - Fifth Floor,
22   Boston, MA 02110-1301, USA.  */
23
24/* tc-a29k.c used as a template.  */
25
26#include "safe-ctype.h"
27#include "as.h"
28#include "opcode/or32.h"
29#include "elf/or32.h"
30
31#define DEBUG 0
32
33#ifndef REGISTER_PREFIX
34#define REGISTER_PREFIX   '%'
35#endif
36
37/* Make it easier to clone this machine desc into another one.  */
38#define machine_opcode  or32_opcode
39#define machine_opcodes or32_opcodes
40#define machine_ip      or32_ip
41#define machine_it      or32_it
42
43/* Handle of the OPCODE hash table.  */
44static struct hash_control *op_hash = NULL;
45
46struct machine_it
47{
48  char *          error;
49  unsigned long   opcode;
50  struct nlist *  nlistp;
51  expressionS     exp;
52  int             pcrel;
53  int             reloc_offset;   /* Offset of reloc within insn.  */
54  int             reloc;
55}
56the_insn;
57
58const pseudo_typeS md_pseudo_table[] =
59{
60  {"align",   s_align_bytes,  4 },
61  {"space",   s_space,        0 },
62  {"cputype", s_ignore,       0 },
63  {"reg",     s_lsym,         0 },  /* Register equate, same as equ.  */
64  {"sect",    s_ignore,       0 },  /* Creation of coff sections.  */
65  {"proc",    s_ignore,       0 },  /* Start of a function.  */
66  {"endproc", s_ignore,       0 },  /* Function end.  */
67  {"word",    cons,           4 },
68  {NULL,      0,              0 },
69};
70
71int md_short_jump_size  = 4;
72int md_long_jump_size   = 4;
73
74/* This array holds the chars that always start a comment.
75   If the pre-processor is disabled, these aren't very useful.  */
76const char comment_chars[] = "#";
77
78/* This array holds the chars that only start a comment at the beginning of
79   a line.  If the line seems to have the form '# 123 filename'
80   .line and .file directives will appear in the pre-processed output.  */
81/* Note that input_file.c hand checks for '#' at the beginning of the
82   first line of the input file.  This is because the compiler outputs
83   #NO_APP at the beginning of its output.  */
84/* Also note that comments like this one will always work.  */
85const char line_comment_chars[] = "#";
86
87/* We needed an unused char for line separation to work around the
88   lack of macros, using sed and such.  */
89const char line_separator_chars[] = ";";
90
91/* Chars that can be used to separate mant from exp in floating point nums.  */
92const char EXP_CHARS[] = "eE";
93
94/* Chars that mean this number is a floating point constant.
95   As in 0f12.456
96   or    0d1.2345e12.  */
97const char FLT_CHARS[] = "rRsSfFdDxXpP";
98
99/* "l.jalr r9" precalculated opcode.  */
100static unsigned long jalr_r9_opcode;
101
102static void machine_ip (char *);
103
104
105/* Set bits in machine opcode according to insn->encoding
106   description and passed operand.  */
107
108static void
109encode (const struct machine_opcode *insn,
110	unsigned long *opcode,
111	signed long param_val,
112	char param_ch)
113{
114  int opc_pos = 0;
115  int param_pos = 0;
116  char *enc;
117
118#if DEBUG
119  printf ("    encode:  opcode=%.8lx  param_val=%.8lx abs=%.8lx param_ch=%c\n",
120	  *opcode, param_val, abs (param_val), param_ch);
121#endif
122  for (enc = insn->encoding; *enc != '\0'; enc++)
123    if (*enc == param_ch)
124      {
125	if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
126	  continue;
127	else
128	  param_pos ++;
129      }
130
131  opc_pos = 32;
132
133  for (enc = insn->encoding; *enc != '\0';)
134    {
135      if ((*enc == '0') && (*(enc + 1) == 'x'))
136	{
137	  int tmp = strtol (enc, NULL, 16);
138
139	  opc_pos -= 4;
140	  *opcode |= tmp << opc_pos;
141	  enc += 3;
142	}
143      else if ((*enc == '0') || (*enc == '-'))
144	{
145	  opc_pos--;
146	  enc++;
147	}
148      else if (*enc == '1')
149	{
150	  opc_pos--;
151	  *opcode |= 1 << opc_pos;
152	  enc++;
153	}
154      else if (*enc == param_ch)
155	{
156	  opc_pos--;
157	  param_pos--;
158	  *opcode |= ((param_val >> param_pos) & 0x1) << opc_pos;
159	  enc++;
160	}
161      else if (ISALPHA (*enc))
162	{
163	  opc_pos--;
164	  enc++;
165	}
166      else
167	enc++;
168    }
169
170#if DEBUG
171  printf ("    opcode=%.8lx\n", *opcode);
172#endif
173}
174
175/* This function is called once, at assembler startup time.  It should
176   set up all the tables, etc., that the MD part of the assembler will
177   need.  */
178
179void
180md_begin (void)
181{
182  const char *retval = NULL;
183  int lose = 0;
184  int skipnext = 0;
185  unsigned int i;
186
187  /* Hash up all the opcodes for fast use later.  */
188  op_hash = hash_new ();
189
190  for (i = 0; i < or32_num_opcodes; i++)
191    {
192      const char *name = machine_opcodes[i].name;
193
194      if (skipnext)
195        {
196          skipnext = 0;
197          continue;
198        }
199
200      retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]);
201      if (retval != NULL)
202        {
203          fprintf (stderr, "internal error: can't hash `%s': %s\n",
204                   machine_opcodes[i].name, retval);
205          lose = 1;
206        }
207    }
208
209  if (lose)
210    as_fatal (_("Broken assembler.  No assembly attempted."));
211
212  encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B');
213}
214
215/* Returns non zero if instruction is to be used.  */
216
217static int
218check_invalid_opcode (unsigned long opcode)
219{
220  return opcode == jalr_r9_opcode;
221}
222
223/* Assemble a single instruction.  Its label has already been handled
224   by the generic front end.  We just parse opcode and operands, and
225   produce the bytes of data and relocation.  */
226
227void
228md_assemble (char *str)
229{
230  char *toP;
231
232#if DEBUG
233  printf ("NEW INSTRUCTION\n");
234#endif
235
236  know (str);
237  machine_ip (str);
238  toP = frag_more (4);
239
240  /* Put out the opcode.  */
241  md_number_to_chars (toP, the_insn.opcode, 4);
242
243  /* Put out the symbol-dependent stuff.  */
244  if (the_insn.reloc != BFD_RELOC_NONE)
245    {
246      fix_new_exp (frag_now,
247                   (toP - frag_now->fr_literal + the_insn.reloc_offset),
248                   4,   /* size */
249                   &the_insn.exp,
250                   the_insn.pcrel,
251                   the_insn.reloc);
252    }
253}
254
255/* This is true of the we have issued a "lo(" or "hi"(.  */
256static int waiting_for_shift = 0;
257
258static int mask_or_shift = 0;
259
260static char *
261parse_operand (char *s, expressionS *operandp, int opt)
262{
263  char *save = input_line_pointer;
264  char *new;
265
266#if DEBUG
267  printf ("  PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt);
268#endif
269
270  input_line_pointer = s;
271
272  if (strncasecmp (s, "HI(", 3) == 0)
273    {
274      waiting_for_shift = 1;
275      mask_or_shift = BFD_RELOC_HI16;
276
277      input_line_pointer += 3;
278    }
279  else if (strncasecmp (s, "LO(", 3) == 0)
280    {
281      mask_or_shift = BFD_RELOC_LO16;
282
283      input_line_pointer += 3;
284    }
285  else
286    mask_or_shift = 0;
287
288  if ((*s == '(') && (*(s+1) == 'r'))
289    s++;
290
291  if ((*s == 'r') && ISDIGIT (*(s + 1)))
292    {
293      operandp->X_add_number = strtol (s + 1, NULL, 10);
294      operandp->X_op = O_register;
295      for (; (*s != ',') && (*s != '\0');)
296        s++;
297      input_line_pointer = save;
298      return s;
299    }
300
301  expression (operandp);
302
303  if (operandp->X_op == O_absent)
304    {
305      if (! opt)
306        as_bad (_("missing operand"));
307      else
308        {
309          operandp->X_add_number = 0;
310          operandp->X_op = O_constant;
311        }
312    }
313
314  new = input_line_pointer;
315  input_line_pointer = save;
316
317#if DEBUG
318  printf ("  %s=parse_operand(%s): operandp->X_op = %u\n", new, s, operandp->X_op);
319#endif
320
321  return new;
322}
323
324/* Instruction parsing.  Takes a string containing the opcode.
325   Operands are at input_line_pointer.  Output is in the_insn.
326   Warnings or errors are generated.  */
327
328static void
329machine_ip (char *str)
330{
331  char *s;
332  const char *args;
333  const struct machine_opcode *insn;
334  char *argsStart;
335  unsigned long opcode;
336  expressionS the_operand;
337  expressionS *operand = &the_operand;
338  unsigned int regno;
339  int reloc = BFD_RELOC_NONE;
340
341#if DEBUG
342  printf ("machine_ip(%s)\n", str);
343#endif
344
345  s = str;
346  for (; ISALNUM (*s) || *s == '.'; ++s)
347    if (ISUPPER (*s))
348      *s = TOLOWER (*s);
349
350  switch (*s)
351    {
352    case '\0':
353      break;
354
355    case ' ':     /* FIXME-SOMEDAY more whitespace.  */
356      *s++ = '\0';
357      break;
358
359    default:
360      as_bad (_("unknown opcode1: `%s'"), str);
361      return;
362    }
363
364  if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
365    {
366      as_bad (_("unknown opcode2 `%s'."), str);
367      return;
368    }
369
370  argsStart = s;
371  opcode = 0;
372  memset (&the_insn, '\0', sizeof (the_insn));
373  the_insn.reloc = BFD_RELOC_NONE;
374
375  reloc = BFD_RELOC_NONE;
376
377  /* Build the opcode, checking as we go to make sure that the
378     operands match.
379
380     If an operand matches, we modify the_insn or opcode appropriately,
381     and do a "continue".  If an operand fails to match, we "break".  */
382  if (insn->args[0] != '\0')
383    /* Prime the pump.  */
384    s = parse_operand (s, operand, insn->args[0] == 'I');
385
386  for (args = insn->args;; ++args)
387    {
388#if DEBUG
389      printf ("  args = %s\n", args);
390#endif
391      switch (*args)
392        {
393        case '\0':    /* End of args.  */
394          /* We have have 0 args, do the bazoooka!  */
395          if (args == insn->args)
396	    encode (insn, &opcode, 0, 0);
397
398          if (*s == '\0')
399            {
400              /* We are truly done.  */
401              the_insn.opcode = opcode;
402              if (check_invalid_opcode (opcode))
403                as_bad (_("instruction not allowed: %s"), str);
404              return;
405            }
406          as_bad (_("too many operands: %s"), s);
407          break;
408
409        case ',':   /* Must match a comma.  */
410          if (*s++ == ',')
411            {
412              reloc = BFD_RELOC_NONE;
413
414              /* Parse next operand.  */
415              s = parse_operand (s, operand, args[1] == 'I');
416#if DEBUG
417	      printf ("    ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n",
418		      operand->X_add_number, args, s);
419#endif
420              continue;
421            }
422          break;
423
424        case '(':   /* Must match a (.  */
425          s = parse_operand (s, operand, args[1] == 'I');
426          continue;
427
428        case ')':   /* Must match a ).  */
429          continue;
430
431        case 'r':   /* A general register.  */
432          args++;
433
434          if (operand->X_op != O_register)
435            break;    /* Only registers.  */
436
437          know (operand->X_add_symbol == 0);
438          know (operand->X_op_symbol == 0);
439          regno = operand->X_add_number;
440          encode (insn, &opcode, regno, *args);
441#if DEBUG
442          printf ("    r: operand->X_op = %d\n", operand->X_op);
443#endif
444          continue;
445
446        default:
447          /* if (! ISALPHA (*args))
448               break;  */   /* Only immediate values.  */
449
450          if (mask_or_shift)
451	    {
452#if DEBUG
453	      printf ("mask_or_shift = %d\n", mask_or_shift);
454#endif
455	      reloc = mask_or_shift;
456	    }
457          mask_or_shift = 0;
458
459          if (strncasecmp (args, "LO(", 3) == 0)
460            {
461#if DEBUG
462              printf ("reloc_const\n");
463#endif
464              reloc = BFD_RELOC_LO16;
465            }
466          else if (strncasecmp (args, "HI(", 3) == 0)
467            {
468#if DEBUG
469              printf ("reloc_consth\n");
470#endif
471              reloc = BFD_RELOC_HI16;
472            }
473
474          if (*s == '(')
475	    operand->X_op = O_constant;
476          else if (*s == ')')
477            s += 1;
478#if DEBUG
479          printf ("    default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s);
480#endif
481          if (operand->X_op == O_constant)
482            {
483	      if (reloc == BFD_RELOC_NONE)
484		{
485		  bfd_vma v, mask;
486
487		  mask = 0x3ffffff;
488		  v = abs (operand->X_add_number) & ~ mask;
489		  if (v)
490		    as_bad (_("call/jmp target out of range (1)"));
491		}
492
493              if (reloc == BFD_RELOC_HI16)
494		operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff);
495
496              the_insn.pcrel = 0;
497              encode (insn, &opcode, operand->X_add_number, *args);
498 /*             the_insn.reloc = BFD_RELOC_NONE; */
499              continue;
500            }
501
502          if (reloc == BFD_RELOC_NONE)
503            the_insn.reloc = BFD_RELOC_32_GOT_PCREL;
504          else
505            the_insn.reloc = reloc;
506
507          /* the_insn.reloc = insn->reloc;  */
508#if DEBUG
509          printf ("    reloc sym=%d\n", the_insn.reloc);
510          printf ("    BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE);
511#endif
512          the_insn.exp = *operand;
513
514          /*  the_insn.reloc_offset = 1;  */
515          the_insn.pcrel = 1; /* Assume PC-relative jump.  */
516
517          /* FIXME-SOON, Do we figure out whether abs later, after
518             know sym val?  */
519          if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16)
520            the_insn.pcrel = 0;
521
522          encode (insn, &opcode, operand->X_add_number, *args);
523          continue;
524        }
525
526      /* Types or values of args don't match.  */
527      as_bad (_("invalid operands"));
528      return;
529    }
530}
531
532/* This is identical to the md_atof in m68k.c.  I think this is right,
533   but I'm not sure.
534
535   Turn a string in input_line_pointer into a floating point constant
536   of type type, and store the appropriate bytes in *litP.  The number
537   of LITTLENUMS emitted is stored in *sizeP .  An error message is
538   returned, or NULL on OK.  */
539
540/* Equal to MAX_PRECISION in atof-ieee.c.  */
541#define MAX_LITTLENUMS 6
542
543char *
544md_atof (int type, char * litP, int *  sizeP)
545{
546  int prec;
547  LITTLENUM_TYPE words[MAX_LITTLENUMS];
548  LITTLENUM_TYPE *wordP;
549  char *t;
550
551  switch (type)
552    {
553    case 'f':
554    case 'F':
555    case 's':
556    case 'S':
557      prec = 2;
558      break;
559
560    case 'd':
561    case 'D':
562    case 'r':
563    case 'R':
564      prec = 4;
565      break;
566
567    case 'x':
568    case 'X':
569      prec = 6;
570      break;
571
572    case 'p':
573    case 'P':
574      prec = 6;
575      break;
576
577    default:
578      *sizeP = 0;
579      return _("Bad call to MD_ATOF()");
580    }
581
582  t = atof_ieee (input_line_pointer, type, words);
583  if (t)
584    input_line_pointer = t;
585
586  *sizeP = prec * sizeof (LITTLENUM_TYPE);
587
588  for (wordP = words; prec--;)
589    {
590      md_number_to_chars (litP, (valueT) (*wordP++), sizeof (LITTLENUM_TYPE));
591      litP += sizeof (LITTLENUM_TYPE);
592    }
593
594  return NULL;
595}
596
597/* Write out big-endian.  */
598
599void
600md_number_to_chars (char *buf, valueT val, int n)
601{
602  number_to_chars_bigendian (buf, val, n);
603}
604
605void
606md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
607{
608  char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
609  long t_val;
610
611  t_val = (long) *val;
612
613#if DEBUG
614  printf ("md_apply_fix val:%x\n", t_val);
615#endif
616
617  fixP->fx_addnumber = t_val; /* Remember value for emit_reloc.  */
618
619  know (fixP->fx_size == 4);
620  know (fixP->fx_r_type < BFD_RELOC_NONE);
621
622  switch (fixP->fx_r_type)
623    {
624    case BFD_RELOC_32:      /* XXXXXXXX pattern in a word.  */
625#if DEBUG
626      printf ("reloc_const: val=%x\n", t_val);
627#endif
628      buf[0] = t_val >> 24;
629      buf[1] = t_val >> 16;
630      buf[2] = t_val >> 8;
631      buf[3] = t_val;
632      break;
633
634    case BFD_RELOC_16:      /* XXXX0000 pattern in a word.  */
635#if DEBUG
636      printf ("reloc_const: val=%x\n", t_val);
637#endif
638      buf[0] = t_val >> 8;
639      buf[1] = t_val;
640      break;
641
642    case BFD_RELOC_8:      /* XX000000 pattern in a word.  */
643#if DEBUG
644      printf ("reloc_const: val=%x\n", t_val);
645#endif
646      buf[0] = t_val;
647      break;
648
649    case BFD_RELOC_LO16:      /* 0000XXXX pattern in a word.  */
650#if DEBUG
651      printf ("reloc_const: val=%x\n", t_val);
652#endif
653      buf[2] = t_val >> 8;  /* Holds bits 0000XXXX.  */
654      buf[3] = t_val;
655      break;
656
657    case BFD_RELOC_HI16:    /* 0000XXXX pattern in a word.  */
658#if DEBUG
659      printf ("reloc_consth: val=%x\n", t_val);
660#endif
661      buf[2] = t_val >> 24; /* Holds bits XXXX0000.  */
662      buf[3] = t_val >> 16;
663      break;
664
665    case BFD_RELOC_32_GOT_PCREL:  /* 0000XXXX pattern in a word.  */
666      if (!fixP->fx_done)
667        ;
668      else if (fixP->fx_pcrel)
669        {
670          long v = t_val >> 28;
671
672          if (v != 0 && v != -1)
673            as_bad_where (fixP->fx_file, fixP->fx_line,
674                          _("call/jmp target out of range (2)"));
675        }
676      else
677        /* This case was supposed to be handled in machine_ip.  */
678        abort ();
679
680      buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address.  */
681      buf[1] = t_val >> 18;
682      buf[2] = t_val >> 10;
683      buf[3] = t_val >> 2;
684      break;
685
686    case BFD_RELOC_VTABLE_INHERIT:
687    case BFD_RELOC_VTABLE_ENTRY:
688      fixP->fx_done = 0;
689      break;
690
691    case BFD_RELOC_NONE:
692    default:
693      as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
694      break;
695    }
696
697  if (fixP->fx_addsy == (symbolS *) NULL)
698    fixP->fx_done = 1;
699}
700
701/* Should never be called for or32.  */
702
703void
704md_create_short_jump (char *    ptr       ATTRIBUTE_UNUSED,
705		      addressT  from_addr ATTRIBUTE_UNUSED,
706		      addressT  to_addr   ATTRIBUTE_UNUSED,
707		      fragS *   frag      ATTRIBUTE_UNUSED,
708		      symbolS * to_symbol ATTRIBUTE_UNUSED)
709{
710  as_fatal ("or32_create_short_jmp\n");
711}
712
713/* Should never be called for or32.  */
714
715void
716md_convert_frag (bfd *   headers ATTRIBUTE_UNUSED,
717		 segT    seg     ATTRIBUTE_UNUSED,
718		 fragS * fragP   ATTRIBUTE_UNUSED)
719{
720  as_fatal ("or32_convert_frag\n");
721}
722
723/* Should never be called for or32.  */
724
725void
726md_create_long_jump (char *    ptr       ATTRIBUTE_UNUSED,
727		     addressT  from_addr ATTRIBUTE_UNUSED,
728		     addressT  to_addr   ATTRIBUTE_UNUSED,
729		     fragS *   frag      ATTRIBUTE_UNUSED,
730		     symbolS * to_symbol ATTRIBUTE_UNUSED)
731{
732  as_fatal ("or32_create_long_jump\n");
733}
734
735/* Should never be called for or32.  */
736
737int
738md_estimate_size_before_relax (fragS * fragP   ATTRIBUTE_UNUSED,
739			       segT    segtype ATTRIBUTE_UNUSED)
740{
741  as_fatal ("or32_estimate_size_before_relax\n");
742  return 0;
743}
744
745/* Translate internal representation of relocation info to target format.
746
747   On sparc/29k: first 4 bytes are normal unsigned long address, next three
748   bytes are index, most sig. byte first.  Byte 7 is broken up with
749   bit 7 as external, bits 6 & 5 unused, and the lower
750   five bits as relocation type.  Next 4 bytes are long addend.  */
751/* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com.  */
752
753#ifdef OBJ_AOUT
754void
755tc_aout_fix_to_chars (char *where,
756		      fixS *fixP,
757		      relax_addressT segment_address_in_file)
758{
759  long r_symbolnum;
760
761#if DEBUG
762  printf ("tc_aout_fix_to_chars\n");
763#endif
764
765  know (fixP->fx_r_type < BFD_RELOC_NONE);
766  know (fixP->fx_addsy != NULL);
767
768  md_number_to_chars
769    (where,
770     fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
771     4);
772
773  r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
774     ? S_GET_TYPE (fixP->fx_addsy)
775     : fixP->fx_addsy->sy_number);
776
777  where[4] = (r_symbolnum >> 16) & 0x0ff;
778  where[5] = (r_symbolnum >> 8) & 0x0ff;
779  where[6] = r_symbolnum & 0x0ff;
780  where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
781
782  /* Also easy.  */
783  md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
784}
785
786#endif /* OBJ_AOUT */
787
788const char *md_shortopts = "";
789
790struct option md_longopts[] =
791{
792  { NULL, no_argument, NULL, 0 }
793};
794size_t md_longopts_size = sizeof (md_longopts);
795
796int
797md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
798{
799  return 0;
800}
801
802void
803md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
804{
805}
806
807/* This is called when a line is unrecognized.  This is used to handle
808   definitions of or32 style local labels.  */
809
810int
811or32_unrecognized_line (int c)
812{
813  int lab;
814  char *s;
815
816  if (c != '$'
817      || ! ISDIGIT ((unsigned char) input_line_pointer[0]))
818    return 0;
819
820  s = input_line_pointer;
821
822  lab = 0;
823  while (ISDIGIT ((unsigned char) *s))
824    {
825      lab = lab * 10 + *s - '0';
826      ++s;
827    }
828
829  if (*s != ':')
830    /* Not a label definition.  */
831    return 0;
832
833  if (dollar_label_defined (lab))
834    {
835      as_bad (_("label \"$%d\" redefined"), lab);
836      return 0;
837    }
838
839  define_dollar_label (lab);
840  colon (dollar_label_name (lab, 0));
841  input_line_pointer = s + 1;
842
843  return 1;
844}
845
846/* Default the values of symbols known that should be "predefined".  We
847   don't bother to predefine them unless you actually use one, since there
848   are a lot of them.  */
849
850symbolS *
851md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
852{
853  return NULL;
854}
855
856/* Parse an operand that is machine-specific.  */
857
858void
859md_operand (expressionS *expressionP)
860{
861#if DEBUG
862  printf ("  md_operand(input_line_pointer = %s)\n", input_line_pointer);
863#endif
864
865  if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
866    {
867      /* We have a numeric register expression.  No biggy.  */
868      input_line_pointer += 2;  /* Skip %r */
869      (void) expression (expressionP);
870
871      if (expressionP->X_op != O_constant
872          || expressionP->X_add_number > 255)
873        as_bad (_("Invalid expression after %%%%\n"));
874      expressionP->X_op = O_register;
875    }
876  else if (input_line_pointer[0] == '&')
877    {
878      /* We are taking the 'address' of a register...this one is not
879         in the manual, but it *is* in traps/fpsymbol.h!  What they
880         seem to want is the register number, as an absolute number.  */
881      input_line_pointer++; /* Skip & */
882      (void) expression (expressionP);
883
884      if (expressionP->X_op != O_register)
885        as_bad (_("invalid register in & expression"));
886      else
887        expressionP->X_op = O_constant;
888    }
889  else if (input_line_pointer[0] == '$'
890           && ISDIGIT ((unsigned char) input_line_pointer[1]))
891    {
892      long lab;
893      char *name;
894      symbolS *sym;
895
896      /* This is a local label.  */
897      ++input_line_pointer;
898      lab = (long) get_absolute_expression ();
899
900      if (dollar_label_defined (lab))
901        {
902          name = dollar_label_name (lab, 0);
903          sym = symbol_find (name);
904        }
905      else
906        {
907          name = dollar_label_name (lab, 1);
908          sym = symbol_find_or_make (name);
909        }
910
911      expressionP->X_op = O_symbol;
912      expressionP->X_add_symbol = sym;
913      expressionP->X_add_number = 0;
914    }
915  else if (input_line_pointer[0] == '$')
916    {
917      char *s;
918      char type;
919      int fieldnum, fieldlimit;
920      LITTLENUM_TYPE floatbuf[8];
921
922      /* $float(), $doubleN(), or $extendN() convert floating values
923         to integers.  */
924      s = input_line_pointer;
925
926      ++s;
927
928      fieldnum = 0;
929      if (strncmp (s, "double", sizeof "double" - 1) == 0)
930        {
931          s += sizeof "double" - 1;
932          type = 'd';
933          fieldlimit = 2;
934        }
935      else if (strncmp (s, "float", sizeof "float" - 1) == 0)
936        {
937          s += sizeof "float" - 1;
938          type = 'f';
939          fieldlimit = 1;
940        }
941      else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
942        {
943          s += sizeof "extend" - 1;
944          type = 'x';
945          fieldlimit = 4;
946        }
947      else
948	return;
949
950      if (ISDIGIT (*s))
951        {
952          fieldnum = *s - '0';
953          ++s;
954        }
955      if (fieldnum >= fieldlimit)
956        return;
957
958      SKIP_WHITESPACE ();
959      if (*s != '(')
960        return;
961      ++s;
962      SKIP_WHITESPACE ();
963
964      s = atof_ieee (s, type, floatbuf);
965      if (s == NULL)
966        return;
967      s = s;
968
969      SKIP_WHITESPACE ();
970      if (*s != ')')
971        return;
972      ++s;
973      SKIP_WHITESPACE ();
974
975      input_line_pointer = s;
976      expressionP->X_op = O_constant;
977      expressionP->X_unsigned = 1;
978      expressionP->X_add_number = ((floatbuf[fieldnum * 2]
979                                    << LITTLENUM_NUMBER_OF_BITS)
980                                   + floatbuf[fieldnum * 2 + 1]);
981    }
982}
983
984/* Round up a section size to the appropriate boundary.  */
985
986valueT
987md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
988{
989  return size;      /* Byte alignment is fine.  */
990}
991
992/* Exactly what point is a PC-relative offset relative TO?
993   On the 29000, they're relative to the address of the instruction,
994   which we have set up as the address of the fixup too.  */
995
996long
997md_pcrel_from (fixS *fixP)
998{
999  return fixP->fx_where + fixP->fx_frag->fr_address;
1000}
1001
1002/* Generate a reloc for a fixup.  */
1003
1004arelent *
1005tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
1006{
1007  arelent *reloc;
1008
1009  reloc = xmalloc (sizeof (arelent));
1010  reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
1011  *reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
1012  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
1013  /*  reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
1014  reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
1015
1016  if (reloc->howto == (reloc_howto_type *) NULL)
1017    {
1018      as_bad_where (fixp->fx_file, fixp->fx_line,
1019		    _("reloc %d not supported by object file format"),
1020		    (int) fixp->fx_r_type);
1021      return NULL;
1022    }
1023
1024  if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
1025    reloc->address = fixp->fx_offset;
1026
1027  reloc->addend = fixp->fx_addnumber;
1028  return reloc;
1029}
1030