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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [opcodes/] [lm32-asm.c] - Blame information for rev 18

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/* Assembler interface for targets using CGEN. -*- C -*-
2
   CGEN: Cpu tools GENerator
3
 
4
   THIS FILE IS MACHINE GENERATED WITH CGEN.
5
   - the resultant file is machine generated, cgen-asm.in isn't
6
 
7
   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2005, 2007, 2008, 2010
8
   Free Software Foundation, Inc.
9
 
10
   This file is part of libopcodes.
11
 
12
   This library is free software; you can redistribute it and/or modify
13
   it under the terms of the GNU General Public License as published by
14
   the Free Software Foundation; either version 3, or (at your option)
15
   any later version.
16
 
17
   It is distributed in the hope that it will be useful, but WITHOUT
18
   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19
   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
20
   License for more details.
21
 
22
   You should have received a copy of the GNU General Public License
23
   along with this program; if not, write to the Free Software Foundation, Inc.,
24
   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
25
 
26
 
27
/* ??? Eventually more and more of this stuff can go to cpu-independent files.
28
   Keep that in mind.  */
29
 
30
#include "sysdep.h"
31
#include <stdio.h>
32
#include "ansidecl.h"
33
#include "bfd.h"
34
#include "symcat.h"
35
#include "lm32-desc.h"
36
#include "lm32-opc.h"
37
#include "opintl.h"
38
#include "xregex.h"
39
#include "libiberty.h"
40
#include "safe-ctype.h"
41
 
42
#undef  min
43
#define min(a,b) ((a) < (b) ? (a) : (b))
44
#undef  max
45
#define max(a,b) ((a) > (b) ? (a) : (b))
46
 
47
static const char * parse_insn_normal
48
  (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
49
 
50
/* -- assembler routines inserted here.  */
51
 
52
/* -- asm.c */
53
 
54
/* Handle signed/unsigned literal.  */
55
 
56
static const char *
57
parse_imm (CGEN_CPU_DESC cd,
58
           const char **strp,
59
           int opindex,
60
           unsigned long *valuep)
61
{
62
  const char *errmsg;
63
  signed long value;
64
 
65
  errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
66
  if (errmsg == NULL)
67
    {
68
      unsigned long x = value & 0xFFFF0000;
69
      if (x != 0 && x != 0xFFFF0000)
70
        errmsg = _("immediate value out of range");
71
      else
72
        *valuep = (value & 0xFFFF);
73
    }
74
  return errmsg;
75
}
76
 
77
/* Handle hi() */
78
 
79
static const char *
80
parse_hi16 (CGEN_CPU_DESC cd,
81
            const char **strp,
82
            int opindex,
83
            unsigned long *valuep)
84
{
85
  if (strncasecmp (*strp, "hi(", 3) == 0)
86
    {
87
      enum cgen_parse_operand_result result_type;
88
      bfd_vma value;
89
      const char *errmsg;
90
 
91
      *strp += 3;
92
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
93
                                   &result_type, &value);
94
      if (**strp != ')')
95
        return _("missing `)'");
96
 
97
      ++*strp;
98
      if (errmsg == NULL
99
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
100
        value = (value >> 16) & 0xffff;
101
      *valuep = value;
102
 
103
      return errmsg;
104
    }
105
 
106
  return parse_imm (cd, strp, opindex, valuep);
107
}
108
 
109
/* Handle lo() */
110
 
111
static const char *
112
parse_lo16 (CGEN_CPU_DESC cd,
113
            const char **strp,
114
            int opindex,
115
            unsigned long *valuep)
116
{
117
  if (strncasecmp (*strp, "lo(", 3) == 0)
118
    {
119
      const char *errmsg;
120
      enum cgen_parse_operand_result result_type;
121
      bfd_vma value;
122
 
123
      *strp += 3;
124
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
125
                                   &result_type, &value);
126
      if (**strp != ')')
127
        return _("missing `)'");
128
      ++*strp;
129
      if (errmsg == NULL
130
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
131
        value &= 0xffff;
132
      *valuep = value;
133
      return errmsg;
134
    }
135
 
136
  return parse_imm (cd, strp, opindex, valuep);
137
}
138
 
139
/* Handle gp() */
140
 
141
static const char *
142
parse_gp16 (CGEN_CPU_DESC cd,
143
            const char **strp,
144
            int opindex,
145
            long *valuep)
146
{
147
  if (strncasecmp (*strp, "gp(", 3) == 0)
148
    {
149
      const char *errmsg;
150
      enum cgen_parse_operand_result result_type;
151
      bfd_vma value;
152
 
153
      *strp += 3;
154
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_GPREL16,
155
                                   & result_type, & value);
156
      if (**strp != ')')
157
        return _("missing `)'");
158
      ++*strp;
159
      if (errmsg == NULL
160
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
161
        value &= 0xffff;
162
      *valuep = value;
163
      return errmsg;
164
    }
165
 
166
  return _("expecting gp relative address: gp(symbol)");
167
}
168
 
169
/* Handle got() */
170
 
171
static const char *
172
parse_got16 (CGEN_CPU_DESC cd,
173
             const char **strp,
174
             int opindex,
175
             long *valuep)
176
{
177
  if (strncasecmp (*strp, "got(", 4) == 0)
178
    {
179
      const char *errmsg;
180
      enum cgen_parse_operand_result result_type;
181
      bfd_vma value;
182
 
183
      *strp += 4;
184
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_16_GOT,
185
                                   & result_type, & value);
186
      if (**strp != ')')
187
        return _("missing `)'");
188
      ++*strp;
189
      if (errmsg == NULL
190
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
191
        value &= 0xffff;
192
      *valuep = value;
193
      return errmsg;
194
    }
195
 
196
  return _("expecting got relative address: got(symbol)");
197
}
198
 
199
/* Handle gotoffhi16() */
200
 
201
static const char *
202
parse_gotoff_hi16 (CGEN_CPU_DESC cd,
203
                   const char **strp,
204
                   int opindex,
205
                   long *valuep)
206
{
207
  if (strncasecmp (*strp, "gotoffhi16(", 11) == 0)
208
    {
209
      const char *errmsg;
210
      enum cgen_parse_operand_result result_type;
211
      bfd_vma value;
212
 
213
      *strp += 11;
214
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_GOTOFF_HI16,
215
                                   & result_type, & value);
216
      if (**strp != ')')
217
        return _("missing `)'");
218
      ++*strp;
219
      if (errmsg == NULL
220
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
221
        value &= 0xffff;
222
      *valuep = value;
223
      return errmsg;
224
    }
225
 
226
  return _("expecting got relative address: gotoffhi16(symbol)");
227
}
228
 
229
/* Handle gotofflo16() */
230
 
231
static const char *
232
parse_gotoff_lo16 (CGEN_CPU_DESC cd,
233
                   const char **strp,
234
                   int opindex,
235
                   long *valuep)
236
{
237
  if (strncasecmp (*strp, "gotofflo16(", 11) == 0)
238
    {
239
      const char *errmsg;
240
      enum cgen_parse_operand_result result_type;
241
      bfd_vma value;
242
 
243
      *strp += 11;
244
      errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_GOTOFF_LO16,
245
                                   &result_type, &value);
246
      if (**strp != ')')
247
        return _("missing `)'");
248
      ++*strp;
249
      if (errmsg == NULL
250
          && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
251
        value &= 0xffff;
252
      *valuep = value;
253
      return errmsg;
254
    }
255
 
256
  return _("expecting got relative address: gotofflo16(symbol)");
257
}
258
 
259
const char * lm32_cgen_parse_operand
260
  (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
261
 
262
/* Main entry point for operand parsing.
263
 
264
   This function is basically just a big switch statement.  Earlier versions
265
   used tables to look up the function to use, but
266
   - if the table contains both assembler and disassembler functions then
267
     the disassembler contains much of the assembler and vice-versa,
268
   - there's a lot of inlining possibilities as things grow,
269
   - using a switch statement avoids the function call overhead.
270
 
271
   This function could be moved into `parse_insn_normal', but keeping it
272
   separate makes clear the interface between `parse_insn_normal' and each of
273
   the handlers.  */
274
 
275
const char *
276
lm32_cgen_parse_operand (CGEN_CPU_DESC cd,
277
                           int opindex,
278
                           const char ** strp,
279
                           CGEN_FIELDS * fields)
280
{
281
  const char * errmsg = NULL;
282
  /* Used by scalar operands that still need to be parsed.  */
283
  long junk ATTRIBUTE_UNUSED;
284
 
285
  switch (opindex)
286
    {
287
    case LM32_OPERAND_BRANCH :
288
      {
289
        bfd_vma value = 0;
290
        errmsg = cgen_parse_address (cd, strp, LM32_OPERAND_BRANCH, 0, NULL,  & value);
291
        fields->f_branch = value;
292
      }
293
      break;
294
    case LM32_OPERAND_CALL :
295
      {
296
        bfd_vma value = 0;
297
        errmsg = cgen_parse_address (cd, strp, LM32_OPERAND_CALL, 0, NULL,  & value);
298
        fields->f_call = value;
299
      }
300
      break;
301
    case LM32_OPERAND_CSR :
302
      errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_csr, & fields->f_csr);
303
      break;
304
    case LM32_OPERAND_EXCEPTION :
305
      errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_EXCEPTION, (unsigned long *) (& fields->f_exception));
306
      break;
307
    case LM32_OPERAND_GOT16 :
308
      errmsg = parse_got16 (cd, strp, LM32_OPERAND_GOT16, (long *) (& fields->f_imm));
309
      break;
310
    case LM32_OPERAND_GOTOFFHI16 :
311
      errmsg = parse_gotoff_hi16 (cd, strp, LM32_OPERAND_GOTOFFHI16, (long *) (& fields->f_imm));
312
      break;
313
    case LM32_OPERAND_GOTOFFLO16 :
314
      errmsg = parse_gotoff_lo16 (cd, strp, LM32_OPERAND_GOTOFFLO16, (long *) (& fields->f_imm));
315
      break;
316
    case LM32_OPERAND_GP16 :
317
      errmsg = parse_gp16 (cd, strp, LM32_OPERAND_GP16, (long *) (& fields->f_imm));
318
      break;
319
    case LM32_OPERAND_HI16 :
320
      errmsg = parse_hi16 (cd, strp, LM32_OPERAND_HI16, (unsigned long *) (& fields->f_uimm));
321
      break;
322
    case LM32_OPERAND_IMM :
323
      errmsg = cgen_parse_signed_integer (cd, strp, LM32_OPERAND_IMM, (long *) (& fields->f_imm));
324
      break;
325
    case LM32_OPERAND_LO16 :
326
      errmsg = parse_lo16 (cd, strp, LM32_OPERAND_LO16, (unsigned long *) (& fields->f_uimm));
327
      break;
328
    case LM32_OPERAND_R0 :
329
      errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r0);
330
      break;
331
    case LM32_OPERAND_R1 :
332
      errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r1);
333
      break;
334
    case LM32_OPERAND_R2 :
335
      errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r2);
336
      break;
337
    case LM32_OPERAND_SHIFT :
338
      errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_SHIFT, (unsigned long *) (& fields->f_shift));
339
      break;
340
    case LM32_OPERAND_UIMM :
341
      errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_UIMM, (unsigned long *) (& fields->f_uimm));
342
      break;
343
    case LM32_OPERAND_USER :
344
      errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_USER, (unsigned long *) (& fields->f_user));
345
      break;
346
 
347
    default :
348
      /* xgettext:c-format */
349
      fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
350
      abort ();
351
  }
352
 
353
  return errmsg;
354
}
355
 
356
cgen_parse_fn * const lm32_cgen_parse_handlers[] =
357
{
358
  parse_insn_normal,
359
};
360
 
361
void
362
lm32_cgen_init_asm (CGEN_CPU_DESC cd)
363
{
364
  lm32_cgen_init_opcode_table (cd);
365
  lm32_cgen_init_ibld_table (cd);
366
  cd->parse_handlers = & lm32_cgen_parse_handlers[0];
367
  cd->parse_operand = lm32_cgen_parse_operand;
368
#ifdef CGEN_ASM_INIT_HOOK
369
CGEN_ASM_INIT_HOOK
370
#endif
371
}
372
 
373
 
374
 
375
/* Regex construction routine.
376
 
377
   This translates an opcode syntax string into a regex string,
378
   by replacing any non-character syntax element (such as an
379
   opcode) with the pattern '.*'
380
 
381
   It then compiles the regex and stores it in the opcode, for
382
   later use by lm32_cgen_assemble_insn
383
 
384
   Returns NULL for success, an error message for failure.  */
385
 
386
char *
387
lm32_cgen_build_insn_regex (CGEN_INSN *insn)
388
{
389
  CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
390
  const char *mnem = CGEN_INSN_MNEMONIC (insn);
391
  char rxbuf[CGEN_MAX_RX_ELEMENTS];
392
  char *rx = rxbuf;
393
  const CGEN_SYNTAX_CHAR_TYPE *syn;
394
  int reg_err;
395
 
396
  syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
397
 
398
  /* Mnemonics come first in the syntax string.  */
399
  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
400
    return _("missing mnemonic in syntax string");
401
  ++syn;
402
 
403
  /* Generate a case sensitive regular expression that emulates case
404
     insensitive matching in the "C" locale.  We cannot generate a case
405
     insensitive regular expression because in Turkish locales, 'i' and 'I'
406
     are not equal modulo case conversion.  */
407
 
408
  /* Copy the literal mnemonic out of the insn.  */
409
  for (; *mnem; mnem++)
410
    {
411
      char c = *mnem;
412
 
413
      if (ISALPHA (c))
414
        {
415
          *rx++ = '[';
416
          *rx++ = TOLOWER (c);
417
          *rx++ = TOUPPER (c);
418
          *rx++ = ']';
419
        }
420
      else
421
        *rx++ = c;
422
    }
423
 
424
  /* Copy any remaining literals from the syntax string into the rx.  */
425
  for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
426
    {
427
      if (CGEN_SYNTAX_CHAR_P (* syn))
428
        {
429
          char c = CGEN_SYNTAX_CHAR (* syn);
430
 
431
          switch (c)
432
            {
433
              /* Escape any regex metacharacters in the syntax.  */
434
            case '.': case '[': case '\\':
435
            case '*': case '^': case '$':
436
 
437
#ifdef CGEN_ESCAPE_EXTENDED_REGEX
438
            case '?': case '{': case '}':
439
            case '(': case ')': case '*':
440
            case '|': case '+': case ']':
441
#endif
442
              *rx++ = '\\';
443
              *rx++ = c;
444
              break;
445
 
446
            default:
447
              if (ISALPHA (c))
448
                {
449
                  *rx++ = '[';
450
                  *rx++ = TOLOWER (c);
451
                  *rx++ = TOUPPER (c);
452
                  *rx++ = ']';
453
                }
454
              else
455
                *rx++ = c;
456
              break;
457
            }
458
        }
459
      else
460
        {
461
          /* Replace non-syntax fields with globs.  */
462
          *rx++ = '.';
463
          *rx++ = '*';
464
        }
465
    }
466
 
467
  /* Trailing whitespace ok.  */
468
  * rx++ = '[';
469
  * rx++ = ' ';
470
  * rx++ = '\t';
471
  * rx++ = ']';
472
  * rx++ = '*';
473
 
474
  /* But anchor it after that.  */
475
  * rx++ = '$';
476
  * rx = '\0';
477
 
478
  CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
479
  reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
480
 
481
  if (reg_err == 0)
482
    return NULL;
483
  else
484
    {
485
      static char msg[80];
486
 
487
      regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
488
      regfree ((regex_t *) CGEN_INSN_RX (insn));
489
      free (CGEN_INSN_RX (insn));
490
      (CGEN_INSN_RX (insn)) = NULL;
491
      return msg;
492
    }
493
}
494
 
495
 
496
/* Default insn parser.
497
 
498
   The syntax string is scanned and operands are parsed and stored in FIELDS.
499
   Relocs are queued as we go via other callbacks.
500
 
501
   ??? Note that this is currently an all-or-nothing parser.  If we fail to
502
   parse the instruction, we return 0 and the caller will start over from
503
   the beginning.  Backtracking will be necessary in parsing subexpressions,
504
   but that can be handled there.  Not handling backtracking here may get
505
   expensive in the case of the m68k.  Deal with later.
506
 
507
   Returns NULL for success, an error message for failure.  */
508
 
509
static const char *
510
parse_insn_normal (CGEN_CPU_DESC cd,
511
                   const CGEN_INSN *insn,
512
                   const char **strp,
513
                   CGEN_FIELDS *fields)
514
{
515
  /* ??? Runtime added insns not handled yet.  */
516
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
517
  const char *str = *strp;
518
  const char *errmsg;
519
  const char *p;
520
  const CGEN_SYNTAX_CHAR_TYPE * syn;
521
#ifdef CGEN_MNEMONIC_OPERANDS
522
  /* FIXME: wip */
523
  int past_opcode_p;
524
#endif
525
 
526
  /* For now we assume the mnemonic is first (there are no leading operands).
527
     We can parse it without needing to set up operand parsing.
528
     GAS's input scrubber will ensure mnemonics are lowercase, but we may
529
     not be called from GAS.  */
530
  p = CGEN_INSN_MNEMONIC (insn);
531
  while (*p && TOLOWER (*p) == TOLOWER (*str))
532
    ++p, ++str;
533
 
534
  if (* p)
535
    return _("unrecognized instruction");
536
 
537
#ifndef CGEN_MNEMONIC_OPERANDS
538
  if (* str && ! ISSPACE (* str))
539
    return _("unrecognized instruction");
540
#endif
541
 
542
  CGEN_INIT_PARSE (cd);
543
  cgen_init_parse_operand (cd);
544
#ifdef CGEN_MNEMONIC_OPERANDS
545
  past_opcode_p = 0;
546
#endif
547
 
548
  /* We don't check for (*str != '\0') here because we want to parse
549
     any trailing fake arguments in the syntax string.  */
550
  syn = CGEN_SYNTAX_STRING (syntax);
551
 
552
  /* Mnemonics come first for now, ensure valid string.  */
553
  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
554
    abort ();
555
 
556
  ++syn;
557
 
558
  while (* syn != 0)
559
    {
560
      /* Non operand chars must match exactly.  */
561
      if (CGEN_SYNTAX_CHAR_P (* syn))
562
        {
563
          /* FIXME: While we allow for non-GAS callers above, we assume the
564
             first char after the mnemonic part is a space.  */
565
          /* FIXME: We also take inappropriate advantage of the fact that
566
             GAS's input scrubber will remove extraneous blanks.  */
567
          if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
568
            {
569
#ifdef CGEN_MNEMONIC_OPERANDS
570
              if (CGEN_SYNTAX_CHAR(* syn) == ' ')
571
                past_opcode_p = 1;
572
#endif
573
              ++ syn;
574
              ++ str;
575
            }
576
          else if (*str)
577
            {
578
              /* Syntax char didn't match.  Can't be this insn.  */
579
              static char msg [80];
580
 
581
              /* xgettext:c-format */
582
              sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
583
                       CGEN_SYNTAX_CHAR(*syn), *str);
584
              return msg;
585
            }
586
          else
587
            {
588
              /* Ran out of input.  */
589
              static char msg [80];
590
 
591
              /* xgettext:c-format */
592
              sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
593
                       CGEN_SYNTAX_CHAR(*syn));
594
              return msg;
595
            }
596
          continue;
597
        }
598
 
599
#ifdef CGEN_MNEMONIC_OPERANDS
600
      (void) past_opcode_p;
601
#endif
602
      /* We have an operand of some sort.  */
603
      errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
604
      if (errmsg)
605
        return errmsg;
606
 
607
      /* Done with this operand, continue with next one.  */
608
      ++ syn;
609
    }
610
 
611
  /* If we're at the end of the syntax string, we're done.  */
612
  if (* syn == 0)
613
    {
614
      /* FIXME: For the moment we assume a valid `str' can only contain
615
         blanks now.  IE: We needn't try again with a longer version of
616
         the insn and it is assumed that longer versions of insns appear
617
         before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
618
      while (ISSPACE (* str))
619
        ++ str;
620
 
621
      if (* str != '\0')
622
        return _("junk at end of line"); /* FIXME: would like to include `str' */
623
 
624
      return NULL;
625
    }
626
 
627
  /* We couldn't parse it.  */
628
  return _("unrecognized instruction");
629
}
630
 
631
/* Main entry point.
632
   This routine is called for each instruction to be assembled.
633
   STR points to the insn to be assembled.
634
   We assume all necessary tables have been initialized.
635
   The assembled instruction, less any fixups, is stored in BUF.
636
   Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
637
   still needs to be converted to target byte order, otherwise BUF is an array
638
   of bytes in target byte order.
639
   The result is a pointer to the insn's entry in the opcode table,
640
   or NULL if an error occured (an error message will have already been
641
   printed).
642
 
643
   Note that when processing (non-alias) macro-insns,
644
   this function recurses.
645
 
646
   ??? It's possible to make this cpu-independent.
647
   One would have to deal with a few minor things.
648
   At this point in time doing so would be more of a curiosity than useful
649
   [for example this file isn't _that_ big], but keeping the possibility in
650
   mind helps keep the design clean.  */
651
 
652
const CGEN_INSN *
653
lm32_cgen_assemble_insn (CGEN_CPU_DESC cd,
654
                           const char *str,
655
                           CGEN_FIELDS *fields,
656
                           CGEN_INSN_BYTES_PTR buf,
657
                           char **errmsg)
658
{
659
  const char *start;
660
  CGEN_INSN_LIST *ilist;
661
  const char *parse_errmsg = NULL;
662
  const char *insert_errmsg = NULL;
663
  int recognized_mnemonic = 0;
664
 
665
  /* Skip leading white space.  */
666
  while (ISSPACE (* str))
667
    ++ str;
668
 
669
  /* The instructions are stored in hashed lists.
670
     Get the first in the list.  */
671
  ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
672
 
673
  /* Keep looking until we find a match.  */
674
  start = str;
675
  for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
676
    {
677
      const CGEN_INSN *insn = ilist->insn;
678
      recognized_mnemonic = 1;
679
 
680
#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
681
      /* Not usually needed as unsupported opcodes
682
         shouldn't be in the hash lists.  */
683
      /* Is this insn supported by the selected cpu?  */
684
      if (! lm32_cgen_insn_supported (cd, insn))
685
        continue;
686
#endif
687
      /* If the RELAXED attribute is set, this is an insn that shouldn't be
688
         chosen immediately.  Instead, it is used during assembler/linker
689
         relaxation if possible.  */
690
      if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
691
        continue;
692
 
693
      str = start;
694
 
695
      /* Skip this insn if str doesn't look right lexically.  */
696
      if (CGEN_INSN_RX (insn) != NULL &&
697
          regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
698
        continue;
699
 
700
      /* Allow parse/insert handlers to obtain length of insn.  */
701
      CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
702
 
703
      parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
704
      if (parse_errmsg != NULL)
705
        continue;
706
 
707
      /* ??? 0 is passed for `pc'.  */
708
      insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
709
                                                 (bfd_vma) 0);
710
      if (insert_errmsg != NULL)
711
        continue;
712
 
713
      /* It is up to the caller to actually output the insn and any
714
         queued relocs.  */
715
      return insn;
716
    }
717
 
718
  {
719
    static char errbuf[150];
720
    const char *tmp_errmsg;
721
#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
722
#define be_verbose 1
723
#else
724
#define be_verbose 0
725
#endif
726
 
727
    if (be_verbose)
728
      {
729
        /* If requesting verbose error messages, use insert_errmsg.
730
           Failing that, use parse_errmsg.  */
731
        tmp_errmsg = (insert_errmsg ? insert_errmsg :
732
                      parse_errmsg ? parse_errmsg :
733
                      recognized_mnemonic ?
734
                      _("unrecognized form of instruction") :
735
                      _("unrecognized instruction"));
736
 
737
        if (strlen (start) > 50)
738
          /* xgettext:c-format */
739
          sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
740
        else
741
          /* xgettext:c-format */
742
          sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
743
      }
744
    else
745
      {
746
        if (strlen (start) > 50)
747
          /* xgettext:c-format */
748
          sprintf (errbuf, _("bad instruction `%.50s...'"), start);
749
        else
750
          /* xgettext:c-format */
751
          sprintf (errbuf, _("bad instruction `%.50s'"), start);
752
      }
753
 
754
    *errmsg = errbuf;
755
    return NULL;
756
  }
757
}

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