opcodes/xstormy16-asm.c

   1 /* 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
   8    Free Software Foundation, Inc.
   9
  10    This file is part of the GNU Binutils and GDB, the GNU debugger.
  11
  12    This program 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 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public 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 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  27    Keep that in mind.  */
  28
  29 #include "sysdep.h"
  30 #include <stdio.h>
  31 #include "ansidecl.h"
  32 #include "bfd.h"
  33 #include "symcat.h"
  34 #include "xstormy16-desc.h"
  35 #include "xstormy16-opc.h"
  36 #include "opintl.h"
  37 #include "xregex.h"
  38 #include "libiberty.h"
  39 #include "safe-ctype.h"
  40
  41 #undef  min
  42 #define min(a,b) ((a) < (b) ? (a) : (b))
  43 #undef  max
  44 #define max(a,b) ((a) > (b) ? (a) : (b))
  45
  46 static const char * parse_insn_normal
  47   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  48 \f
  49 /* -- assembler routines inserted here.  */
  50
  51 /* -- asm.c */
  52
  53 /* The machine-independent code doesn't know how to disambiguate
  54      mov (foo),r3
  55    and
  56      mov (r2),r3
  57    where 'foo' is a label.  This helps it out. */
  58
  59 static const char *
  60 parse_mem8 (CGEN_CPU_DESC cd,
  61             const char **strp,
  62             int opindex,
  63             unsigned long *valuep)
  64 {
  65   if (**strp == '(')
  66     {
  67       const char *s = *strp;
  68
  69       if (s[1] == '-' && s[2] == '-')
  70         return _("Bad register in preincrement");
  71
  72       while (ISALNUM (*++s))
  73         ;
  74       if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ','))
  75         return _("Bad register in postincrement");
  76       if (s[0] == ',' || s[0] == ')')
  77         return _("Bad register name");
  78     }
  79   else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names,
  80                                (long *) valuep) == NULL)
  81     return _("Label conflicts with register name");
  82   else if (strncasecmp (*strp, "rx,", 3) == 0
  83            || strncasecmp (*strp, "rxl,", 3) == 0
  84            || strncasecmp (*strp, "rxh,", 3) == 0)
  85     return _("Label conflicts with `Rx'");
  86   else if (**strp == '#')
  87     return _("Bad immediate expression");
  88
  89   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
  90 }
  91
  92 /* For the add and subtract instructions, there are two immediate forms,
  93    one for small operands and one for large ones.  We want to use
  94    the small one when possible, but we do not want to generate relocs
  95    of the small size.  This is somewhat tricky.  */
  96
  97 static const char *
  98 parse_small_immediate (CGEN_CPU_DESC cd,
  99                        const char **strp,
 100                        int opindex,
 101                        unsigned long *valuep)
 102 {
 103   bfd_vma value;
 104   enum cgen_parse_operand_result result;
 105   const char *errmsg;
 106
 107   if (**strp == '@')
 108     return _("No relocation for small immediate");
 109
 110   errmsg = (* cd->parse_operand_fn)
 111     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 112      & result, & value);
 113
 114   if (errmsg)
 115     return errmsg;
 116
 117   if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER)
 118     return _("Small operand was not an immediate number");
 119
 120   *valuep = value;
 121   return NULL;
 122 }
 123
 124 /* Literal scan be either a normal literal, a @hi() or @lo relocation.  */
 125
 126 static const char *
 127 parse_immediate16 (CGEN_CPU_DESC cd,
 128                    const char **strp,
 129                    int opindex,
 130                    unsigned long *valuep)
 131 {
 132   const char *errmsg;
 133   enum cgen_parse_operand_result result;
 134   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 135   bfd_vma value;
 136
 137   if (strncmp (*strp, "@hi(", 4) == 0)
 138     {
 139       *strp += 4;
 140       code = BFD_RELOC_HI16;
 141     }
 142   else
 143   if (strncmp (*strp, "@lo(", 4) == 0)
 144     {
 145       *strp += 4;
 146       code = BFD_RELOC_LO16;
 147     }
 148
 149   if (code == BFD_RELOC_NONE)
 150     errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 151   else
 152     {
 153       errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value);
 154       if ((errmsg == NULL) &&
 155           (result != CGEN_PARSE_OPERAND_RESULT_QUEUED))
 156         errmsg = _("Operand is not a symbol");
 157
 158       *valuep = value;
 159       if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16)
 160           && **strp == ')')
 161         *strp += 1;
 162       else
 163         {
 164           errmsg = _("Syntax error: No trailing ')'");
 165           return errmsg;
 166         }
 167     }
 168   return errmsg;
 169 }
 170 /* -- */
 171
 172 const char * xstormy16_cgen_parse_operand
 173   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 174
 175 /* Main entry point for operand parsing.
 176
 177    This function is basically just a big switch statement.  Earlier versions
 178    used tables to look up the function to use, but
 179    - if the table contains both assembler and disassembler functions then
 180      the disassembler contains much of the assembler and vice-versa,
 181    - there's a lot of inlining possibilities as things grow,
 182    - using a switch statement avoids the function call overhead.
 183
 184    This function could be moved into `parse_insn_normal', but keeping it
 185    separate makes clear the interface between `parse_insn_normal' and each of
 186    the handlers.  */
 187
 188 const char *
 189 xstormy16_cgen_parse_operand (CGEN_CPU_DESC cd,
 190                            int opindex,
 191                            const char ** strp,
 192                            CGEN_FIELDS * fields)
 193 {
 194   const char * errmsg = NULL;
 195   /* Used by scalar operands that still need to be parsed.  */
 196   long junk ATTRIBUTE_UNUSED;
 197
 198   switch (opindex)
 199     {
 200     case XSTORMY16_OPERAND_RB :
 201       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_Rb_names, & fields->f_Rb);
 202       break;
 203     case XSTORMY16_OPERAND_RBJ :
 204       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_Rb_names, & fields->f_Rbj);
 205       break;
 206     case XSTORMY16_OPERAND_RD :
 207       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rd);
 208       break;
 209     case XSTORMY16_OPERAND_RDM :
 210       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rdm);
 211       break;
 212     case XSTORMY16_OPERAND_RM :
 213       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rm);
 214       break;
 215     case XSTORMY16_OPERAND_RS :
 216       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rs);
 217       break;
 218     case XSTORMY16_OPERAND_ABS24 :
 219       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_ABS24, (unsigned long *) (& fields->f_abs24));
 220       break;
 221     case XSTORMY16_OPERAND_BCOND2 :
 222       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_branchcond, & fields->f_op2);
 223       break;
 224     case XSTORMY16_OPERAND_BCOND5 :
 225       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_branchcond, & fields->f_op5);
 226       break;
 227     case XSTORMY16_OPERAND_HMEM8 :
 228       errmsg = parse_mem8 (cd, strp, XSTORMY16_OPERAND_HMEM8, (unsigned long *) (& fields->f_hmem8));
 229       break;
 230     case XSTORMY16_OPERAND_IMM12 :
 231       errmsg = cgen_parse_signed_integer (cd, strp, XSTORMY16_OPERAND_IMM12, (long *) (& fields->f_imm12));
 232       break;
 233     case XSTORMY16_OPERAND_IMM16 :
 234       errmsg = parse_immediate16 (cd, strp, XSTORMY16_OPERAND_IMM16, (unsigned long *) (& fields->f_imm16));
 235       break;
 236     case XSTORMY16_OPERAND_IMM2 :
 237       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM2, (unsigned long *) (& fields->f_imm2));
 238       break;
 239     case XSTORMY16_OPERAND_IMM3 :
 240       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM3, (unsigned long *) (& fields->f_imm3));
 241       break;
 242     case XSTORMY16_OPERAND_IMM3B :
 243       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM3B, (unsigned long *) (& fields->f_imm3b));
 244       break;
 245     case XSTORMY16_OPERAND_IMM4 :
 246       errmsg = parse_small_immediate (cd, strp, XSTORMY16_OPERAND_IMM4, (unsigned long *) (& fields->f_imm4));
 247       break;
 248     case XSTORMY16_OPERAND_IMM8 :
 249       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM8, (unsigned long *) (& fields->f_imm8));
 250       break;
 251     case XSTORMY16_OPERAND_IMM8SMALL :
 252       errmsg = parse_small_immediate (cd, strp, XSTORMY16_OPERAND_IMM8SMALL, (unsigned long *) (& fields->f_imm8));
 253       break;
 254     case XSTORMY16_OPERAND_LMEM8 :
 255       errmsg = parse_mem8 (cd, strp, XSTORMY16_OPERAND_LMEM8, (unsigned long *) (& fields->f_lmem8));
 256       break;
 257     case XSTORMY16_OPERAND_REL12 :
 258       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL12, (unsigned long *) (& fields->f_rel12));
 259       break;
 260     case XSTORMY16_OPERAND_REL12A :
 261       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL12A, (unsigned long *) (& fields->f_rel12a));
 262       break;
 263     case XSTORMY16_OPERAND_REL8_2 :
 264       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL8_2, (unsigned long *) (& fields->f_rel8_2));
 265       break;
 266     case XSTORMY16_OPERAND_REL8_4 :
 267       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL8_4, (unsigned long *) (& fields->f_rel8_4));
 268       break;
 269     case XSTORMY16_OPERAND_WS2 :
 270       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_wordsize, & fields->f_op2m);
 271       break;
 272
 273     default :
 274       /* xgettext:c-format */
 275       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 276       abort ();
 277   }
 278
 279   return errmsg;
 280 }
 281
 282 cgen_parse_fn * const xstormy16_cgen_parse_handlers[] =
 283 {
 284   parse_insn_normal,
 285 };
 286
 287 void
 288 xstormy16_cgen_init_asm (CGEN_CPU_DESC cd)
 289 {
 290   xstormy16_cgen_init_opcode_table (cd);
 291   xstormy16_cgen_init_ibld_table (cd);
 292   cd->parse_handlers = & xstormy16_cgen_parse_handlers[0];
 293   cd->parse_operand = xstormy16_cgen_parse_operand;
 294 }
 295
 296 \f
 297
 298 /* Regex construction routine.
 299
 300    This translates an opcode syntax string into a regex string,
 301    by replacing any non-character syntax element (such as an
 302    opcode) with the pattern '.*'
 303
 304    It then compiles the regex and stores it in the opcode, for
 305    later use by xstormy16_cgen_assemble_insn
 306
 307    Returns NULL for success, an error message for failure.  */
 308
 309 char *
 310 xstormy16_cgen_build_insn_regex (CGEN_INSN *insn)
 311 {
 312   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 313   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 314   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 315   char *rx = rxbuf;
 316   const CGEN_SYNTAX_CHAR_TYPE *syn;
 317   int reg_err;
 318
 319   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 320
 321   /* Mnemonics come first in the syntax string.  */
 322   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 323     return _("missing mnemonic in syntax string");
 324   ++syn;
 325
 326   /* Generate a case sensitive regular expression that emulates case
 327      insensitive matching in the "C" locale.  We cannot generate a case
 328      insensitive regular expression because in Turkish locales, 'i' and 'I'
 329      are not equal modulo case conversion.  */
 330
 331   /* Copy the literal mnemonic out of the insn.  */
 332   for (; *mnem; mnem++)
 333     {
 334       char c = *mnem;
 335
 336       if (ISALPHA (c))
 337         {
 338           *rx++ = '[';
 339           *rx++ = TOLOWER (c);
 340           *rx++ = TOUPPER (c);
 341           *rx++ = ']';
 342         }
 343       else
 344         *rx++ = c;
 345     }
 346
 347   /* Copy any remaining literals from the syntax string into the rx.  */
 348   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 349     {
 350       if (CGEN_SYNTAX_CHAR_P (* syn))
 351         {
 352           char c = CGEN_SYNTAX_CHAR (* syn);
 353
 354           switch (c)
 355             {
 356               /* Escape any regex metacharacters in the syntax.  */
 357             case '.': case '[': case '\\':
 358             case '*': case '^': case '$':
 359
 360 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 361             case '?': case '{': case '}':
 362             case '(': case ')': case '*':
 363             case '|': case '+': case ']':
 364 #endif
 365               *rx++ = '\\';
 366               *rx++ = c;
 367               break;
 368
 369             default:
 370               if (ISALPHA (c))
 371                 {
 372                   *rx++ = '[';
 373                   *rx++ = TOLOWER (c);
 374                   *rx++ = TOUPPER (c);
 375                   *rx++ = ']';
 376                 }
 377               else
 378                 *rx++ = c;
 379               break;
 380             }
 381         }
 382       else
 383         {
 384           /* Replace non-syntax fields with globs.  */
 385           *rx++ = '.';
 386           *rx++ = '*';
 387         }
 388     }
 389
 390   /* Trailing whitespace ok.  */
 391   * rx++ = '[';
 392   * rx++ = ' ';
 393   * rx++ = '\t';
 394   * rx++ = ']';
 395   * rx++ = '*';
 396
 397   /* But anchor it after that.  */
 398   * rx++ = '$';
 399   * rx = '\0';
 400
 401   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 402   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 403
 404   if (reg_err == 0)
 405     return NULL;
 406   else
 407     {
 408       static char msg[80];
 409
 410       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 411       regfree ((regex_t *) CGEN_INSN_RX (insn));
 412       free (CGEN_INSN_RX (insn));
 413       (CGEN_INSN_RX (insn)) = NULL;
 414       return msg;
 415     }
 416 }
 417
 418 \f
 419 /* Default insn parser.
 420
 421    The syntax string is scanned and operands are parsed and stored in FIELDS.
 422    Relocs are queued as we go via other callbacks.
 423
 424    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 425    parse the instruction, we return 0 and the caller will start over from
 426    the beginning.  Backtracking will be necessary in parsing subexpressions,
 427    but that can be handled there.  Not handling backtracking here may get
 428    expensive in the case of the m68k.  Deal with later.
 429
 430    Returns NULL for success, an error message for failure.  */
 431
 432 static const char *
 433 parse_insn_normal (CGEN_CPU_DESC cd,
 434                    const CGEN_INSN *insn,
 435                    const char **strp,
 436                    CGEN_FIELDS *fields)
 437 {
 438   /* ??? Runtime added insns not handled yet.  */
 439   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 440   const char *str = *strp;
 441   const char *errmsg;
 442   const char *p;
 443   const CGEN_SYNTAX_CHAR_TYPE * syn;
 444 #ifdef CGEN_MNEMONIC_OPERANDS
 445   /* FIXME: wip */
 446   int past_opcode_p;
 447 #endif
 448
 449   /* For now we assume the mnemonic is first (there are no leading operands).
 450      We can parse it without needing to set up operand parsing.
 451      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 452      not be called from GAS.  */
 453   p = CGEN_INSN_MNEMONIC (insn);
 454   while (*p && TOLOWER (*p) == TOLOWER (*str))
 455     ++p, ++str;
 456
 457   if (* p)
 458     return _("unrecognized instruction");
 459
 460 #ifndef CGEN_MNEMONIC_OPERANDS
 461   if (* str && ! ISSPACE (* str))
 462     return _("unrecognized instruction");
 463 #endif
 464
 465   CGEN_INIT_PARSE (cd);
 466   cgen_init_parse_operand (cd);
 467 #ifdef CGEN_MNEMONIC_OPERANDS
 468   past_opcode_p = 0;
 469 #endif
 470
 471   /* We don't check for (*str != '\0') here because we want to parse
 472      any trailing fake arguments in the syntax string.  */
 473   syn = CGEN_SYNTAX_STRING (syntax);
 474
 475   /* Mnemonics come first for now, ensure valid string.  */
 476   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 477     abort ();
 478
 479   ++syn;
 480
 481   while (* syn != 0)
 482     {
 483       /* Non operand chars must match exactly.  */
 484       if (CGEN_SYNTAX_CHAR_P (* syn))
 485         {
 486           /* FIXME: While we allow for non-GAS callers above, we assume the
 487              first char after the mnemonic part is a space.  */
 488           /* FIXME: We also take inappropriate advantage of the fact that
 489              GAS's input scrubber will remove extraneous blanks.  */
 490           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 491             {
 492 #ifdef CGEN_MNEMONIC_OPERANDS
 493               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 494                 past_opcode_p = 1;
 495 #endif
 496               ++ syn;
 497               ++ str;
 498             }
 499           else if (*str)
 500             {
 501               /* Syntax char didn't match.  Can't be this insn.  */
 502               static char msg [80];
 503
 504               /* xgettext:c-format */
 505               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 506                        CGEN_SYNTAX_CHAR(*syn), *str);
 507               return msg;
 508             }
 509           else
 510             {
 511               /* Ran out of input.  */
 512               static char msg [80];
 513
 514               /* xgettext:c-format */
 515               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 516                        CGEN_SYNTAX_CHAR(*syn));
 517               return msg;
 518             }
 519           continue;
 520         }
 521
 522       /* We have an operand of some sort.  */
 523       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 524                                           &str, fields);
 525       if (errmsg)
 526         return errmsg;
 527
 528       /* Done with this operand, continue with next one.  */
 529       ++ syn;
 530     }
 531
 532   /* If we're at the end of the syntax string, we're done.  */
 533   if (* syn == 0)
 534     {
 535       /* FIXME: For the moment we assume a valid `str' can only contain
 536          blanks now.  IE: We needn't try again with a longer version of
 537          the insn and it is assumed that longer versions of insns appear
 538          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 539       while (ISSPACE (* str))
 540         ++ str;
 541
 542       if (* str != '\0')
 543         return _("junk at end of line"); /* FIXME: would like to include `str' */
 544
 545       return NULL;
 546     }
 547
 548   /* We couldn't parse it.  */
 549   return _("unrecognized instruction");
 550 }
 551 \f
 552 /* Main entry point.
 553    This routine is called for each instruction to be assembled.
 554    STR points to the insn to be assembled.
 555    We assume all necessary tables have been initialized.
 556    The assembled instruction, less any fixups, is stored in BUF.
 557    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 558    still needs to be converted to target byte order, otherwise BUF is an array
 559    of bytes in target byte order.
 560    The result is a pointer to the insn's entry in the opcode table,
 561    or NULL if an error occured (an error message will have already been
 562    printed).
 563
 564    Note that when processing (non-alias) macro-insns,
 565    this function recurses.
 566
 567    ??? It's possible to make this cpu-independent.
 568    One would have to deal with a few minor things.
 569    At this point in time doing so would be more of a curiosity than useful
 570    [for example this file isn't _that_ big], but keeping the possibility in
 571    mind helps keep the design clean.  */
 572
 573 const CGEN_INSN *
 574 xstormy16_cgen_assemble_insn (CGEN_CPU_DESC cd,
 575                            const char *str,
 576                            CGEN_FIELDS *fields,
 577                            CGEN_INSN_BYTES_PTR buf,
 578                            char **errmsg)
 579 {
 580   const char *start;
 581   CGEN_INSN_LIST *ilist;
 582   const char *parse_errmsg = NULL;
 583   const char *insert_errmsg = NULL;
 584   int recognized_mnemonic = 0;
 585
 586   /* Skip leading white space.  */
 587   while (ISSPACE (* str))
 588     ++ str;
 589
 590   /* The instructions are stored in hashed lists.
 591      Get the first in the list.  */
 592   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 593
 594   /* Keep looking until we find a match.  */
 595   start = str;
 596   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 597     {
 598       const CGEN_INSN *insn = ilist->insn;
 599       recognized_mnemonic = 1;
 600
 601 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 602       /* Not usually needed as unsupported opcodes
 603          shouldn't be in the hash lists.  */
 604       /* Is this insn supported by the selected cpu?  */
 605       if (! xstormy16_cgen_insn_supported (cd, insn))
 606         continue;
 607 #endif
 608       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 609          chosen immediately.  Instead, it is used during assembler/linker
 610          relaxation if possible.  */
 611       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 612         continue;
 613
 614       str = start;
 615
 616       /* Skip this insn if str doesn't look right lexically.  */
 617       if (CGEN_INSN_RX (insn) != NULL &&
 618           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 619         continue;
 620
 621       /* Allow parse/insert handlers to obtain length of insn.  */
 622       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 623
 624       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 625       if (parse_errmsg != NULL)
 626         continue;
 627
 628       /* ??? 0 is passed for `pc'.  */
 629       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 630                                                  (bfd_vma) 0);
 631       if (insert_errmsg != NULL)
 632         continue;
 633
 634       /* It is up to the caller to actually output the insn and any
 635          queued relocs.  */
 636       return insn;
 637     }
 638
 639   {
 640     static char errbuf[150];
 641 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 642     const char *tmp_errmsg;
 643
 644     /* If requesting verbose error messages, use insert_errmsg.
 645        Failing that, use parse_errmsg.  */
 646     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 647                   parse_errmsg ? parse_errmsg :
 648                   recognized_mnemonic ?
 649                   _("unrecognized form of instruction") :
 650                   _("unrecognized instruction"));
 651
 652     if (strlen (start) > 50)
 653       /* xgettext:c-format */
 654       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 655     else
 656       /* xgettext:c-format */
 657       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 658 #else
 659     if (strlen (start) > 50)
 660       /* xgettext:c-format */
 661       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 662     else
 663       /* xgettext:c-format */
 664       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 665 #endif
 666
 667     *errmsg = errbuf;
 668     return NULL;
 669   }
 670 }