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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [opcodes/] [xc16x-asm.c] - Blame information for rev 225

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1 24 jeremybenn
/* 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
 
7 225 jeremybenn
   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2005, 2007, 2008
8 24 jeremybenn
   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 "xc16x-desc.h"
36
#include "xc16x-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
/* Handle '#' prefixes (i.e. skip over them).  */
54
 
55
static const char *
56
parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
57
            const char **strp,
58
            int opindex ATTRIBUTE_UNUSED,
59
            long *valuep ATTRIBUTE_UNUSED)
60
{
61
  if (**strp == '#')
62
    {
63
      ++*strp;
64
      return NULL;
65
    }
66
  return _("Missing '#' prefix");
67
}
68
 
69
/* Handle '.' prefixes (i.e. skip over them).  */
70
 
71
static const char *
72
parse_dot (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
73
           const char **strp,
74
           int opindex ATTRIBUTE_UNUSED,
75
           long *valuep ATTRIBUTE_UNUSED)
76
{
77
  if (**strp == '.')
78
    {
79
      ++*strp;
80
      return NULL;
81
    }
82
  return _("Missing '.' prefix");
83
}
84
 
85
/* Handle 'pof:' prefixes (i.e. skip over them).  */
86
 
87
static const char *
88
parse_pof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
89
           const char **strp,
90
           int opindex ATTRIBUTE_UNUSED,
91
           long *valuep ATTRIBUTE_UNUSED)
92
{
93
  if (strncasecmp (*strp, "pof:", 4) == 0)
94
    {
95
      *strp += 4;
96
      return NULL;
97
    }
98
  return _("Missing 'pof:' prefix");
99
}
100
 
101
/* Handle 'pag:' prefixes (i.e. skip over them).  */
102
 
103
static const char *
104
parse_pag (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
105
           const char **strp,
106
           int opindex ATTRIBUTE_UNUSED,
107
           long *valuep ATTRIBUTE_UNUSED)
108
{
109
  if (strncasecmp (*strp, "pag:", 4) == 0)
110
    {
111
      *strp += 4;
112
      return NULL;
113
    }
114
  return _("Missing 'pag:' prefix");
115
}
116
 
117
/* Handle 'sof' prefixes (i.e. skip over them).  */
118
 
119
static const char *
120
parse_sof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
121
           const char **strp,
122
           int opindex ATTRIBUTE_UNUSED,
123
           long *valuep ATTRIBUTE_UNUSED)
124
{
125
  if (strncasecmp (*strp, "sof:", 4) == 0)
126
    {
127
      *strp += 4;
128
      return NULL;
129
    }
130
  return _("Missing 'sof:' prefix");
131
}
132
 
133
/* Handle 'seg' prefixes (i.e. skip over them).  */
134
 
135
static const char *
136
parse_seg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
137
           const char **strp,
138
           int opindex ATTRIBUTE_UNUSED,
139
           long *valuep ATTRIBUTE_UNUSED)
140
{
141
  if (strncasecmp (*strp, "seg:", 4) == 0)
142
    {
143
      *strp += 4;
144
      return NULL;
145
    }
146
  return _("Missing 'seg:' prefix");
147
}
148
/* -- */
149
 
150
const char * xc16x_cgen_parse_operand
151
  (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
152
 
153
/* Main entry point for operand parsing.
154
 
155
   This function is basically just a big switch statement.  Earlier versions
156
   used tables to look up the function to use, but
157
   - if the table contains both assembler and disassembler functions then
158
     the disassembler contains much of the assembler and vice-versa,
159
   - there's a lot of inlining possibilities as things grow,
160
   - using a switch statement avoids the function call overhead.
161
 
162
   This function could be moved into `parse_insn_normal', but keeping it
163
   separate makes clear the interface between `parse_insn_normal' and each of
164
   the handlers.  */
165
 
166
const char *
167
xc16x_cgen_parse_operand (CGEN_CPU_DESC cd,
168
                           int opindex,
169
                           const char ** strp,
170
                           CGEN_FIELDS * fields)
171
{
172
  const char * errmsg = NULL;
173
  /* Used by scalar operands that still need to be parsed.  */
174
  long junk ATTRIBUTE_UNUSED;
175
 
176
  switch (opindex)
177
    {
178
    case XC16X_OPERAND_REGNAM :
179
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_psw_names, & fields->f_reg8);
180
      break;
181
    case XC16X_OPERAND_BIT01 :
182
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT01, (unsigned long *) (& fields->f_op_1bit));
183
      break;
184
    case XC16X_OPERAND_BIT1 :
185
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT1, (unsigned long *) (& fields->f_op_bit1));
186
      break;
187
    case XC16X_OPERAND_BIT2 :
188
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT2, (unsigned long *) (& fields->f_op_bit2));
189
      break;
190
    case XC16X_OPERAND_BIT4 :
191
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT4, (unsigned long *) (& fields->f_op_bit4));
192
      break;
193
    case XC16X_OPERAND_BIT8 :
194
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT8, (unsigned long *) (& fields->f_op_bit8));
195
      break;
196
    case XC16X_OPERAND_BITONE :
197
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BITONE, (unsigned long *) (& fields->f_op_onebit));
198
      break;
199
    case XC16X_OPERAND_CADDR :
200
      {
201
        bfd_vma value = 0;
202
        errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_CADDR, 0, NULL,  & value);
203
        fields->f_offset16 = value;
204
      }
205
      break;
206
    case XC16X_OPERAND_COND :
207
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_condcode);
208
      break;
209
    case XC16X_OPERAND_DATA8 :
210
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATA8, (unsigned long *) (& fields->f_data8));
211
      break;
212
    case XC16X_OPERAND_DATAHI8 :
213
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATAHI8, (unsigned long *) (& fields->f_datahi8));
214
      break;
215
    case XC16X_OPERAND_DOT :
216
      errmsg = parse_dot (cd, strp, XC16X_OPERAND_DOT, (long *) (& junk));
217
      break;
218
    case XC16X_OPERAND_DR :
219
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
220
      break;
221
    case XC16X_OPERAND_DRB :
222
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r1);
223
      break;
224
    case XC16X_OPERAND_DRI :
225
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r4);
226
      break;
227
    case XC16X_OPERAND_EXTCOND :
228
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_extconditioncode_names, & fields->f_extccode);
229
      break;
230
    case XC16X_OPERAND_GENREG :
231
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regb8);
232
      break;
233
    case XC16X_OPERAND_HASH :
234
      errmsg = parse_hash (cd, strp, XC16X_OPERAND_HASH, (long *) (& junk));
235
      break;
236
    case XC16X_OPERAND_ICOND :
237
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_icondcode);
238
      break;
239
    case XC16X_OPERAND_LBIT2 :
240
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT2, (unsigned long *) (& fields->f_op_lbit2));
241
      break;
242
    case XC16X_OPERAND_LBIT4 :
243
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT4, (unsigned long *) (& fields->f_op_lbit4));
244
      break;
245
    case XC16X_OPERAND_MASK8 :
246
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASK8, (unsigned long *) (& fields->f_mask8));
247
      break;
248
    case XC16X_OPERAND_MASKLO8 :
249
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASKLO8, (unsigned long *) (& fields->f_datahi8));
250
      break;
251
    case XC16X_OPERAND_MEMGR8 :
252
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_memgr8_names, & fields->f_memgr8);
253
      break;
254
    case XC16X_OPERAND_MEMORY :
255
      {
256
        bfd_vma value = 0;
257
        errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_MEMORY, 0, NULL,  & value);
258
        fields->f_memory = value;
259
      }
260
      break;
261
    case XC16X_OPERAND_PAG :
262
      errmsg = parse_pag (cd, strp, XC16X_OPERAND_PAG, (long *) (& junk));
263
      break;
264
    case XC16X_OPERAND_PAGENUM :
265
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_PAGENUM, (unsigned long *) (& fields->f_pagenum));
266
      break;
267
    case XC16X_OPERAND_POF :
268
      errmsg = parse_pof (cd, strp, XC16X_OPERAND_POF, (long *) (& junk));
269
      break;
270
    case XC16X_OPERAND_QBIT :
271
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QBIT, (unsigned long *) (& fields->f_qbit));
272
      break;
273
    case XC16X_OPERAND_QHIBIT :
274
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QHIBIT, (unsigned long *) (& fields->f_qhibit));
275
      break;
276
    case XC16X_OPERAND_QLOBIT :
277
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QLOBIT, (unsigned long *) (& fields->f_qlobit));
278
      break;
279
    case XC16X_OPERAND_REG8 :
280
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reg8);
281
      break;
282
    case XC16X_OPERAND_REGB8 :
283
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb8_names, & fields->f_regb8);
284
      break;
285
    case XC16X_OPERAND_REGBMEM8 :
286
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regbmem8_names, & fields->f_regmem8);
287
      break;
288
    case XC16X_OPERAND_REGHI8 :
289
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reghi8);
290
      break;
291
    case XC16X_OPERAND_REGMEM8 :
292
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regmem8_names, & fields->f_regmem8);
293
      break;
294
    case XC16X_OPERAND_REGOFF8 :
295
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regoff8);
296
      break;
297
    case XC16X_OPERAND_REL :
298
      errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_REL, (long *) (& fields->f_rel8));
299
      break;
300
    case XC16X_OPERAND_RELHI :
301
      errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_RELHI, (long *) (& fields->f_relhi8));
302
      break;
303
    case XC16X_OPERAND_SEG :
304
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEG, (unsigned long *) (& fields->f_seg8));
305
      break;
306
    case XC16X_OPERAND_SEGHI8 :
307
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEGHI8, (unsigned long *) (& fields->f_segnum8));
308
      break;
309
    case XC16X_OPERAND_SEGM :
310
      errmsg = parse_seg (cd, strp, XC16X_OPERAND_SEGM, (long *) (& junk));
311
      break;
312
    case XC16X_OPERAND_SOF :
313
      errmsg = parse_sof (cd, strp, XC16X_OPERAND_SOF, (long *) (& junk));
314
      break;
315
    case XC16X_OPERAND_SR :
316
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
317
      break;
318
    case XC16X_OPERAND_SR2 :
319
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r0);
320
      break;
321
    case XC16X_OPERAND_SRB :
322
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r2);
323
      break;
324
    case XC16X_OPERAND_SRC1 :
325
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
326
      break;
327
    case XC16X_OPERAND_SRC2 :
328
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
329
      break;
330
    case XC16X_OPERAND_SRDIV :
331
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regdiv8_names, & fields->f_reg8);
332
      break;
333
    case XC16X_OPERAND_U4 :
334
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name, & fields->f_uimm4);
335
      break;
336
    case XC16X_OPERAND_UIMM16 :
337
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
338
      break;
339
    case XC16X_OPERAND_UIMM2 :
340
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_ext_names, & fields->f_uimm2);
341
      break;
342
    case XC16X_OPERAND_UIMM3 :
343
      errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name1, & fields->f_uimm3);
344
      break;
345
    case XC16X_OPERAND_UIMM4 :
346
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
347
      break;
348
    case XC16X_OPERAND_UIMM7 :
349
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM7, (unsigned long *) (& fields->f_uimm7));
350
      break;
351
    case XC16X_OPERAND_UIMM8 :
352
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
353
      break;
354
    case XC16X_OPERAND_UPAG16 :
355
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UPAG16, (unsigned long *) (& fields->f_uimm16));
356
      break;
357
    case XC16X_OPERAND_UPOF16 :
358
      {
359
        bfd_vma value = 0;
360
        errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_UPOF16, 0, NULL,  & value);
361
        fields->f_memory = value;
362
      }
363
      break;
364
    case XC16X_OPERAND_USEG16 :
365
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG16, (unsigned long *) (& fields->f_offset16));
366
      break;
367
    case XC16X_OPERAND_USEG8 :
368
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG8, (unsigned long *) (& fields->f_seg8));
369
      break;
370
    case XC16X_OPERAND_USOF16 :
371
      errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USOF16, (unsigned long *) (& fields->f_offset16));
372
      break;
373
 
374
    default :
375
      /* xgettext:c-format */
376
      fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
377
      abort ();
378
  }
379
 
380
  return errmsg;
381
}
382
 
383
cgen_parse_fn * const xc16x_cgen_parse_handlers[] =
384
{
385
  parse_insn_normal,
386
};
387
 
388
void
389
xc16x_cgen_init_asm (CGEN_CPU_DESC cd)
390
{
391
  xc16x_cgen_init_opcode_table (cd);
392
  xc16x_cgen_init_ibld_table (cd);
393
  cd->parse_handlers = & xc16x_cgen_parse_handlers[0];
394
  cd->parse_operand = xc16x_cgen_parse_operand;
395
#ifdef CGEN_ASM_INIT_HOOK
396
CGEN_ASM_INIT_HOOK
397
#endif
398
}
399
 
400
 
401
 
402
/* Regex construction routine.
403
 
404
   This translates an opcode syntax string into a regex string,
405
   by replacing any non-character syntax element (such as an
406
   opcode) with the pattern '.*'
407
 
408
   It then compiles the regex and stores it in the opcode, for
409
   later use by xc16x_cgen_assemble_insn
410
 
411
   Returns NULL for success, an error message for failure.  */
412
 
413
char *
414
xc16x_cgen_build_insn_regex (CGEN_INSN *insn)
415
{
416
  CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
417
  const char *mnem = CGEN_INSN_MNEMONIC (insn);
418
  char rxbuf[CGEN_MAX_RX_ELEMENTS];
419
  char *rx = rxbuf;
420
  const CGEN_SYNTAX_CHAR_TYPE *syn;
421
  int reg_err;
422
 
423
  syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
424
 
425
  /* Mnemonics come first in the syntax string.  */
426
  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
427
    return _("missing mnemonic in syntax string");
428
  ++syn;
429
 
430
  /* Generate a case sensitive regular expression that emulates case
431
     insensitive matching in the "C" locale.  We cannot generate a case
432
     insensitive regular expression because in Turkish locales, 'i' and 'I'
433
     are not equal modulo case conversion.  */
434
 
435
  /* Copy the literal mnemonic out of the insn.  */
436
  for (; *mnem; mnem++)
437
    {
438
      char c = *mnem;
439
 
440
      if (ISALPHA (c))
441
        {
442
          *rx++ = '[';
443
          *rx++ = TOLOWER (c);
444
          *rx++ = TOUPPER (c);
445
          *rx++ = ']';
446
        }
447
      else
448
        *rx++ = c;
449
    }
450
 
451
  /* Copy any remaining literals from the syntax string into the rx.  */
452
  for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
453
    {
454
      if (CGEN_SYNTAX_CHAR_P (* syn))
455
        {
456
          char c = CGEN_SYNTAX_CHAR (* syn);
457
 
458
          switch (c)
459
            {
460
              /* Escape any regex metacharacters in the syntax.  */
461
            case '.': case '[': case '\\':
462
            case '*': case '^': case '$':
463
 
464
#ifdef CGEN_ESCAPE_EXTENDED_REGEX
465
            case '?': case '{': case '}':
466
            case '(': case ')': case '*':
467
            case '|': case '+': case ']':
468
#endif
469
              *rx++ = '\\';
470
              *rx++ = c;
471
              break;
472
 
473
            default:
474
              if (ISALPHA (c))
475
                {
476
                  *rx++ = '[';
477
                  *rx++ = TOLOWER (c);
478
                  *rx++ = TOUPPER (c);
479
                  *rx++ = ']';
480
                }
481
              else
482
                *rx++ = c;
483
              break;
484
            }
485
        }
486
      else
487
        {
488
          /* Replace non-syntax fields with globs.  */
489
          *rx++ = '.';
490
          *rx++ = '*';
491
        }
492
    }
493
 
494
  /* Trailing whitespace ok.  */
495
  * rx++ = '[';
496
  * rx++ = ' ';
497
  * rx++ = '\t';
498
  * rx++ = ']';
499
  * rx++ = '*';
500
 
501
  /* But anchor it after that.  */
502
  * rx++ = '$';
503
  * rx = '\0';
504
 
505
  CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
506
  reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
507
 
508
  if (reg_err == 0)
509
    return NULL;
510
  else
511
    {
512
      static char msg[80];
513
 
514
      regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
515
      regfree ((regex_t *) CGEN_INSN_RX (insn));
516
      free (CGEN_INSN_RX (insn));
517
      (CGEN_INSN_RX (insn)) = NULL;
518
      return msg;
519
    }
520
}
521
 
522
 
523
/* Default insn parser.
524
 
525
   The syntax string is scanned and operands are parsed and stored in FIELDS.
526
   Relocs are queued as we go via other callbacks.
527
 
528
   ??? Note that this is currently an all-or-nothing parser.  If we fail to
529
   parse the instruction, we return 0 and the caller will start over from
530
   the beginning.  Backtracking will be necessary in parsing subexpressions,
531
   but that can be handled there.  Not handling backtracking here may get
532
   expensive in the case of the m68k.  Deal with later.
533
 
534
   Returns NULL for success, an error message for failure.  */
535
 
536
static const char *
537
parse_insn_normal (CGEN_CPU_DESC cd,
538
                   const CGEN_INSN *insn,
539
                   const char **strp,
540
                   CGEN_FIELDS *fields)
541
{
542
  /* ??? Runtime added insns not handled yet.  */
543
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
544
  const char *str = *strp;
545
  const char *errmsg;
546
  const char *p;
547
  const CGEN_SYNTAX_CHAR_TYPE * syn;
548
#ifdef CGEN_MNEMONIC_OPERANDS
549
  /* FIXME: wip */
550
  int past_opcode_p;
551
#endif
552
 
553
  /* For now we assume the mnemonic is first (there are no leading operands).
554
     We can parse it without needing to set up operand parsing.
555
     GAS's input scrubber will ensure mnemonics are lowercase, but we may
556
     not be called from GAS.  */
557
  p = CGEN_INSN_MNEMONIC (insn);
558
  while (*p && TOLOWER (*p) == TOLOWER (*str))
559
    ++p, ++str;
560
 
561
  if (* p)
562
    return _("unrecognized instruction");
563
 
564
#ifndef CGEN_MNEMONIC_OPERANDS
565
  if (* str && ! ISSPACE (* str))
566
    return _("unrecognized instruction");
567
#endif
568
 
569
  CGEN_INIT_PARSE (cd);
570
  cgen_init_parse_operand (cd);
571
#ifdef CGEN_MNEMONIC_OPERANDS
572
  past_opcode_p = 0;
573
#endif
574
 
575
  /* We don't check for (*str != '\0') here because we want to parse
576
     any trailing fake arguments in the syntax string.  */
577
  syn = CGEN_SYNTAX_STRING (syntax);
578
 
579
  /* Mnemonics come first for now, ensure valid string.  */
580
  if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
581
    abort ();
582
 
583
  ++syn;
584
 
585
  while (* syn != 0)
586
    {
587
      /* Non operand chars must match exactly.  */
588
      if (CGEN_SYNTAX_CHAR_P (* syn))
589
        {
590
          /* FIXME: While we allow for non-GAS callers above, we assume the
591
             first char after the mnemonic part is a space.  */
592
          /* FIXME: We also take inappropriate advantage of the fact that
593
             GAS's input scrubber will remove extraneous blanks.  */
594
          if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
595
            {
596
#ifdef CGEN_MNEMONIC_OPERANDS
597
              if (CGEN_SYNTAX_CHAR(* syn) == ' ')
598
                past_opcode_p = 1;
599
#endif
600
              ++ syn;
601
              ++ str;
602
            }
603
          else if (*str)
604
            {
605
              /* Syntax char didn't match.  Can't be this insn.  */
606
              static char msg [80];
607
 
608
              /* xgettext:c-format */
609
              sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
610
                       CGEN_SYNTAX_CHAR(*syn), *str);
611
              return msg;
612
            }
613
          else
614
            {
615
              /* Ran out of input.  */
616
              static char msg [80];
617
 
618
              /* xgettext:c-format */
619
              sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
620
                       CGEN_SYNTAX_CHAR(*syn));
621
              return msg;
622
            }
623
          continue;
624
        }
625
 
626
      /* We have an operand of some sort.  */
627
      errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
628
                                          &str, fields);
629
      if (errmsg)
630
        return errmsg;
631
 
632
      /* Done with this operand, continue with next one.  */
633
      ++ syn;
634
    }
635
 
636
  /* If we're at the end of the syntax string, we're done.  */
637
  if (* syn == 0)
638
    {
639
      /* FIXME: For the moment we assume a valid `str' can only contain
640
         blanks now.  IE: We needn't try again with a longer version of
641
         the insn and it is assumed that longer versions of insns appear
642
         before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
643
      while (ISSPACE (* str))
644
        ++ str;
645
 
646
      if (* str != '\0')
647
        return _("junk at end of line"); /* FIXME: would like to include `str' */
648
 
649
      return NULL;
650
    }
651
 
652
  /* We couldn't parse it.  */
653
  return _("unrecognized instruction");
654
}
655
 
656
/* Main entry point.
657
   This routine is called for each instruction to be assembled.
658
   STR points to the insn to be assembled.
659
   We assume all necessary tables have been initialized.
660
   The assembled instruction, less any fixups, is stored in BUF.
661
   Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
662
   still needs to be converted to target byte order, otherwise BUF is an array
663
   of bytes in target byte order.
664
   The result is a pointer to the insn's entry in the opcode table,
665
   or NULL if an error occured (an error message will have already been
666
   printed).
667
 
668
   Note that when processing (non-alias) macro-insns,
669
   this function recurses.
670
 
671
   ??? It's possible to make this cpu-independent.
672
   One would have to deal with a few minor things.
673
   At this point in time doing so would be more of a curiosity than useful
674
   [for example this file isn't _that_ big], but keeping the possibility in
675
   mind helps keep the design clean.  */
676
 
677
const CGEN_INSN *
678
xc16x_cgen_assemble_insn (CGEN_CPU_DESC cd,
679
                           const char *str,
680
                           CGEN_FIELDS *fields,
681
                           CGEN_INSN_BYTES_PTR buf,
682
                           char **errmsg)
683
{
684
  const char *start;
685
  CGEN_INSN_LIST *ilist;
686
  const char *parse_errmsg = NULL;
687
  const char *insert_errmsg = NULL;
688
  int recognized_mnemonic = 0;
689
 
690
  /* Skip leading white space.  */
691
  while (ISSPACE (* str))
692
    ++ str;
693
 
694
  /* The instructions are stored in hashed lists.
695
     Get the first in the list.  */
696
  ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
697
 
698
  /* Keep looking until we find a match.  */
699
  start = str;
700
  for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
701
    {
702
      const CGEN_INSN *insn = ilist->insn;
703
      recognized_mnemonic = 1;
704
 
705
#ifdef CGEN_VALIDATE_INSN_SUPPORTED 
706
      /* Not usually needed as unsupported opcodes
707
         shouldn't be in the hash lists.  */
708
      /* Is this insn supported by the selected cpu?  */
709
      if (! xc16x_cgen_insn_supported (cd, insn))
710
        continue;
711
#endif
712
      /* If the RELAXED attribute is set, this is an insn that shouldn't be
713
         chosen immediately.  Instead, it is used during assembler/linker
714
         relaxation if possible.  */
715
      if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
716
        continue;
717
 
718
      str = start;
719
 
720
      /* Skip this insn if str doesn't look right lexically.  */
721
      if (CGEN_INSN_RX (insn) != NULL &&
722
          regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
723
        continue;
724
 
725
      /* Allow parse/insert handlers to obtain length of insn.  */
726
      CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
727
 
728
      parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
729
      if (parse_errmsg != NULL)
730
        continue;
731
 
732
      /* ??? 0 is passed for `pc'.  */
733
      insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
734
                                                 (bfd_vma) 0);
735
      if (insert_errmsg != NULL)
736
        continue;
737
 
738
      /* It is up to the caller to actually output the insn and any
739
         queued relocs.  */
740
      return insn;
741
    }
742
 
743
  {
744
    static char errbuf[150];
745
#ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
746
    const char *tmp_errmsg;
747
 
748
    /* If requesting verbose error messages, use insert_errmsg.
749
       Failing that, use parse_errmsg.  */
750
    tmp_errmsg = (insert_errmsg ? insert_errmsg :
751
                  parse_errmsg ? parse_errmsg :
752
                  recognized_mnemonic ?
753
                  _("unrecognized form of instruction") :
754
                  _("unrecognized instruction"));
755
 
756
    if (strlen (start) > 50)
757
      /* xgettext:c-format */
758
      sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
759
    else
760
      /* xgettext:c-format */
761
      sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
762
#else
763
    if (strlen (start) > 50)
764
      /* xgettext:c-format */
765
      sprintf (errbuf, _("bad instruction `%.50s...'"), start);
766
    else
767
      /* xgettext:c-format */
768
      sprintf (errbuf, _("bad instruction `%.50s'"), start);
769
#endif
770
 
771
    *errmsg = errbuf;
772
    return NULL;
773
  }
774
}

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