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 #ifdef CGEN_ASM_INIT_HOOK
 295 CGEN_ASM_INIT_HOOK
 296 #endif
 297 }
 298
 299 \f
 300
 301 /* Regex construction routine.
 302
 303    This translates an opcode syntax string into a regex string,
 304    by replacing any non-character syntax element (such as an
 305    opcode) with the pattern '.*'
 306
 307    It then compiles the regex and stores it in the opcode, for
 308    later use by xstormy16_cgen_assemble_insn
 309
 310    Returns NULL for success, an error message for failure.  */
 311
 312 char *
 313 xstormy16_cgen_build_insn_regex (CGEN_INSN *insn)
 314 {
 315   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 316   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 317   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 318   char *rx = rxbuf;
 319   const CGEN_SYNTAX_CHAR_TYPE *syn;
 320   int reg_err;
 321
 322   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 323
 324   /* Mnemonics come first in the syntax string.  */
 325   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 326     return _("missing mnemonic in syntax string");
 327   ++syn;
 328
 329   /* Generate a case sensitive regular expression that emulates case
 330      insensitive matching in the "C" locale.  We cannot generate a case
 331      insensitive regular expression because in Turkish locales, 'i' and 'I'
 332      are not equal modulo case conversion.  */
 333
 334   /* Copy the literal mnemonic out of the insn.  */
 335   for (; *mnem; mnem++)
 336     {
 337       char c = *mnem;
 338
 339       if (ISALPHA (c))
 340         {
 341           *rx++ = '[';
 342           *rx++ = TOLOWER (c);
 343           *rx++ = TOUPPER (c);
 344           *rx++ = ']';
 345         }
 346       else
 347         *rx++ = c;
 348     }
 349
 350   /* Copy any remaining literals from the syntax string into the rx.  */
 351   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 352     {
 353       if (CGEN_SYNTAX_CHAR_P (* syn))
 354         {
 355           char c = CGEN_SYNTAX_CHAR (* syn);
 356
 357           switch (c)
 358             {
 359               /* Escape any regex metacharacters in the syntax.  */
 360             case '.': case '[': case '\\':
 361             case '*': case '^': case '$':
 362
 363 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 364             case '?': case '{': case '}':
 365             case '(': case ')': case '*':
 366             case '|': case '+': case ']':
 367 #endif
 368               *rx++ = '\\';
 369               *rx++ = c;
 370               break;
 371
 372             default:
 373               if (ISALPHA (c))
 374                 {
 375                   *rx++ = '[';
 376                   *rx++ = TOLOWER (c);
 377                   *rx++ = TOUPPER (c);
 378                   *rx++ = ']';
 379                 }
 380               else
 381                 *rx++ = c;
 382               break;
 383             }
 384         }
 385       else
 386         {
 387           /* Replace non-syntax fields with globs.  */
 388           *rx++ = '.';
 389           *rx++ = '*';
 390         }
 391     }
 392
 393   /* Trailing whitespace ok.  */
 394   * rx++ = '[';
 395   * rx++ = ' ';
 396   * rx++ = '\t';
 397   * rx++ = ']';
 398   * rx++ = '*';
 399
 400   /* But anchor it after that.  */
 401   * rx++ = '$';
 402   * rx = '\0';
 403
 404   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 405   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 406
 407   if (reg_err == 0)
 408     return NULL;
 409   else
 410     {
 411       static char msg[80];
 412
 413       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 414       regfree ((regex_t *) CGEN_INSN_RX (insn));
 415       free (CGEN_INSN_RX (insn));
 416       (CGEN_INSN_RX (insn)) = NULL;
 417       return msg;
 418     }
 419 }
 420
 421 \f
 422 /* Default insn parser.
 423
 424    The syntax string is scanned and operands are parsed and stored in FIELDS.
 425    Relocs are queued as we go via other callbacks.
 426
 427    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 428    parse the instruction, we return 0 and the caller will start over from
 429    the beginning.  Backtracking will be necessary in parsing subexpressions,
 430    but that can be handled there.  Not handling backtracking here may get
 431    expensive in the case of the m68k.  Deal with later.
 432
 433    Returns NULL for success, an error message for failure.  */
 434
 435 static const char *
 436 parse_insn_normal (CGEN_CPU_DESC cd,
 437                    const CGEN_INSN *insn,
 438                    const char **strp,
 439                    CGEN_FIELDS *fields)
 440 {
 441   /* ??? Runtime added insns not handled yet.  */
 442   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 443   const char *str = *strp;
 444   const char *errmsg;
 445   const char *p;
 446   const CGEN_SYNTAX_CHAR_TYPE * syn;
 447 #ifdef CGEN_MNEMONIC_OPERANDS
 448   /* FIXME: wip */
 449   int past_opcode_p;
 450 #endif
 451
 452   /* For now we assume the mnemonic is first (there are no leading operands).
 453      We can parse it without needing to set up operand parsing.
 454      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 455      not be called from GAS.  */
 456   p = CGEN_INSN_MNEMONIC (insn);
 457   while (*p && TOLOWER (*p) == TOLOWER (*str))
 458     ++p, ++str;
 459
 460   if (* p)
 461     return _("unrecognized instruction");
 462
 463 #ifndef CGEN_MNEMONIC_OPERANDS
 464   if (* str && ! ISSPACE (* str))
 465     return _("unrecognized instruction");
 466 #endif
 467
 468   CGEN_INIT_PARSE (cd);
 469   cgen_init_parse_operand (cd);
 470 #ifdef CGEN_MNEMONIC_OPERANDS
 471   past_opcode_p = 0;
 472 #endif
 473
 474   /* We don't check for (*str != '\0') here because we want to parse
 475      any trailing fake arguments in the syntax string.  */
 476   syn = CGEN_SYNTAX_STRING (syntax);
 477
 478   /* Mnemonics come first for now, ensure valid string.  */
 479   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 480     abort ();
 481
 482   ++syn;
 483
 484   while (* syn != 0)
 485     {
 486       /* Non operand chars must match exactly.  */
 487       if (CGEN_SYNTAX_CHAR_P (* syn))
 488         {
 489           /* FIXME: While we allow for non-GAS callers above, we assume the
 490              first char after the mnemonic part is a space.  */
 491           /* FIXME: We also take inappropriate advantage of the fact that
 492              GAS's input scrubber will remove extraneous blanks.  */
 493           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 494             {
 495 #ifdef CGEN_MNEMONIC_OPERANDS
 496               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 497                 past_opcode_p = 1;
 498 #endif
 499               ++ syn;
 500               ++ str;
 501             }
 502           else if (*str)
 503             {
 504               /* Syntax char didn't match.  Can't be this insn.  */
 505               static char msg [80];
 506
 507               /* xgettext:c-format */
 508               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 509                        CGEN_SYNTAX_CHAR(*syn), *str);
 510               return msg;
 511             }
 512           else
 513             {
 514               /* Ran out of input.  */
 515               static char msg [80];
 516
 517               /* xgettext:c-format */
 518               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 519                        CGEN_SYNTAX_CHAR(*syn));
 520               return msg;
 521             }
 522           continue;
 523         }
 524
 525       /* We have an operand of some sort.  */
 526       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 527                                           &str, fields);
 528       if (errmsg)
 529         return errmsg;
 530
 531       /* Done with this operand, continue with next one.  */
 532       ++ syn;
 533     }
 534
 535   /* If we're at the end of the syntax string, we're done.  */
 536   if (* syn == 0)
 537     {
 538       /* FIXME: For the moment we assume a valid `str' can only contain
 539          blanks now.  IE: We needn't try again with a longer version of
 540          the insn and it is assumed that longer versions of insns appear
 541          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 542       while (ISSPACE (* str))
 543         ++ str;
 544
 545       if (* str != '\0')
 546         return _("junk at end of line"); /* FIXME: would like to include `str' */
 547
 548       return NULL;
 549     }
 550
 551   /* We couldn't parse it.  */
 552   return _("unrecognized instruction");
 553 }
 554 \f
 555 /* Main entry point.
 556    This routine is called for each instruction to be assembled.
 557    STR points to the insn to be assembled.
 558    We assume all necessary tables have been initialized.
 559    The assembled instruction, less any fixups, is stored in BUF.
 560    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 561    still needs to be converted to target byte order, otherwise BUF is an array
 562    of bytes in target byte order.
 563    The result is a pointer to the insn's entry in the opcode table,
 564    or NULL if an error occured (an error message will have already been
 565    printed).
 566
 567    Note that when processing (non-alias) macro-insns,
 568    this function recurses.
 569
 570    ??? It's possible to make this cpu-independent.
 571    One would have to deal with a few minor things.
 572    At this point in time doing so would be more of a curiosity than useful
 573    [for example this file isn't _that_ big], but keeping the possibility in
 574    mind helps keep the design clean.  */
 575
 576 const CGEN_INSN *
 577 xstormy16_cgen_assemble_insn (CGEN_CPU_DESC cd,
 578                            const char *str,
 579                            CGEN_FIELDS *fields,
 580                            CGEN_INSN_BYTES_PTR buf,
 581                            char **errmsg)
 582 {
 583   const char *start;
 584   CGEN_INSN_LIST *ilist;
 585   const char *parse_errmsg = NULL;
 586   const char *insert_errmsg = NULL;
 587   int recognized_mnemonic = 0;
 588
 589   /* Skip leading white space.  */
 590   while (ISSPACE (* str))
 591     ++ str;
 592
 593   /* The instructions are stored in hashed lists.
 594      Get the first in the list.  */
 595   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 596
 597   /* Keep looking until we find a match.  */
 598   start = str;
 599   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 600     {
 601       const CGEN_INSN *insn = ilist->insn;
 602       recognized_mnemonic = 1;
 603
 604 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 605       /* Not usually needed as unsupported opcodes
 606          shouldn't be in the hash lists.  */
 607       /* Is this insn supported by the selected cpu?  */
 608       if (! xstormy16_cgen_insn_supported (cd, insn))
 609         continue;
 610 #endif
 611       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 612          chosen immediately.  Instead, it is used during assembler/linker
 613          relaxation if possible.  */
 614       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 615         continue;
 616
 617       str = start;
 618
 619       /* Skip this insn if str doesn't look right lexically.  */
 620       if (CGEN_INSN_RX (insn) != NULL &&
 621           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 622         continue;
 623
 624       /* Allow parse/insert handlers to obtain length of insn.  */
 625       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 626
 627       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 628       if (parse_errmsg != NULL)
 629         continue;
 630
 631       /* ??? 0 is passed for `pc'.  */
 632       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 633                                                  (bfd_vma) 0);
 634       if (insert_errmsg != NULL)
 635         continue;
 636
 637       /* It is up to the caller to actually output the insn and any
 638          queued relocs.  */
 639       return insn;
 640     }
 641
 642   {
 643     static char errbuf[150];
 644 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 645     const char *tmp_errmsg;
 646
 647     /* If requesting verbose error messages, use insert_errmsg.
 648        Failing that, use parse_errmsg.  */
 649     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 650                   parse_errmsg ? parse_errmsg :
 651                   recognized_mnemonic ?
 652                   _("unrecognized form of instruction") :
 653                   _("unrecognized instruction"));
 654
 655     if (strlen (start) > 50)
 656       /* xgettext:c-format */
 657       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 658     else
 659       /* xgettext:c-format */
 660       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 661 #else
 662     if (strlen (start) > 50)
 663       /* xgettext:c-format */
 664       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 665     else
 666       /* xgettext:c-format */
 667       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 668 #endif
 669
 670     *errmsg = errbuf;
 671     return NULL;
 672   }
 673 }