opcodes/xstormy16-asm.c

   1 /* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
   2 /* Assembler interface for targets using CGEN. -*- C -*-
   3    CGEN: Cpu tools GENerator
   4
   5    THIS FILE IS MACHINE GENERATED WITH CGEN.
   6    - the resultant file is machine generated, cgen-asm.in isn't
   7
   8    Copyright (C) 1996-2019 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 "xstormy16-desc.h"
  36 #include "xstormy16-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 \f
  50 /* -- assembler routines inserted here.  */
  51
  52 /* -- asm.c */
  53
  54 /* The machine-independent code doesn't know how to disambiguate
  55      mov (foo),r3
  56    and
  57      mov (r2),r3
  58    where 'foo' is a label.  This helps it out. */
  59
  60 static const char *
  61 parse_mem8 (CGEN_CPU_DESC cd,
  62             const char **strp,
  63             int opindex,
  64             unsigned long *valuep)
  65 {
  66   if (**strp == '(')
  67     {
  68       const char *s = *strp;
  69
  70       if (s[1] == '-' && s[2] == '-')
  71         return _("Bad register in preincrement");
  72
  73       while (ISALNUM (*++s))
  74         ;
  75       if (s[0] == '+' && s[1] == '+' && (s[2] == ')' || s[2] == ','))
  76         return _("Bad register in postincrement");
  77       if (s[0] == ',' || s[0] == ')')
  78         return _("Bad register name");
  79     }
  80   else if (cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names,
  81                                (long *) valuep) == NULL)
  82     return _("Label conflicts with register name");
  83   else if (strncasecmp (*strp, "rx,", 3) == 0
  84            || strncasecmp (*strp, "rxl,", 3) == 0
  85            || strncasecmp (*strp, "rxh,", 3) == 0)
  86     return _("Label conflicts with `Rx'");
  87   else if (**strp == '#')
  88     return _("Bad immediate expression");
  89
  90   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
  91 }
  92
  93 /* For the add and subtract instructions, there are two immediate forms,
  94    one for small operands and one for large ones.  We want to use
  95    the small one when possible, but we do not want to generate relocs
  96    of the small size.  This is somewhat tricky.  */
  97
  98 static const char *
  99 parse_small_immediate (CGEN_CPU_DESC cd,
 100                        const char **strp,
 101                        int opindex,
 102                        unsigned long *valuep)
 103 {
 104   bfd_vma value;
 105   enum cgen_parse_operand_result result;
 106   const char *errmsg;
 107
 108   if (**strp == '@')
 109     return _("No relocation for small immediate");
 110
 111   errmsg = (* cd->parse_operand_fn)
 112     (cd, CGEN_PARSE_OPERAND_INTEGER, strp, opindex, BFD_RELOC_NONE,
 113      & result, & value);
 114
 115   if (errmsg)
 116     return errmsg;
 117
 118   if (result != CGEN_PARSE_OPERAND_RESULT_NUMBER)
 119     return _("Small operand was not an immediate number");
 120
 121   *valuep = value;
 122   return NULL;
 123 }
 124
 125 /* Literal scan be either a normal literal, a @hi() or @lo relocation.  */
 126
 127 static const char *
 128 parse_immediate16 (CGEN_CPU_DESC cd,
 129                    const char **strp,
 130                    int opindex,
 131                    unsigned long *valuep)
 132 {
 133   const char *errmsg;
 134   enum cgen_parse_operand_result result;
 135   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 136   bfd_vma value;
 137
 138   if (strncmp (*strp, "@hi(", 4) == 0)
 139     {
 140       *strp += 4;
 141       code = BFD_RELOC_HI16;
 142     }
 143   else
 144   if (strncmp (*strp, "@lo(", 4) == 0)
 145     {
 146       *strp += 4;
 147       code = BFD_RELOC_LO16;
 148     }
 149
 150   if (code == BFD_RELOC_NONE)
 151     errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 152   else
 153     {
 154       errmsg = cgen_parse_address (cd, strp, opindex, code, &result, &value);
 155       if ((errmsg == NULL) &&
 156           (result != CGEN_PARSE_OPERAND_RESULT_QUEUED))
 157         errmsg = _("Operand is not a symbol");
 158
 159       *valuep = value;
 160       if ((code == BFD_RELOC_HI16 || code == BFD_RELOC_LO16)
 161           && **strp == ')')
 162         *strp += 1;
 163       else
 164         {
 165           errmsg = _("Syntax error: No trailing ')'");
 166           return errmsg;
 167         }
 168     }
 169   return errmsg;
 170 }
 171 /* -- */
 172
 173 const char * xstormy16_cgen_parse_operand
 174   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 175
 176 /* Main entry point for operand parsing.
 177
 178    This function is basically just a big switch statement.  Earlier versions
 179    used tables to look up the function to use, but
 180    - if the table contains both assembler and disassembler functions then
 181      the disassembler contains much of the assembler and vice-versa,
 182    - there's a lot of inlining possibilities as things grow,
 183    - using a switch statement avoids the function call overhead.
 184
 185    This function could be moved into `parse_insn_normal', but keeping it
 186    separate makes clear the interface between `parse_insn_normal' and each of
 187    the handlers.  */
 188
 189 const char *
 190 xstormy16_cgen_parse_operand (CGEN_CPU_DESC cd,
 191                            int opindex,
 192                            const char ** strp,
 193                            CGEN_FIELDS * fields)
 194 {
 195   const char * errmsg = NULL;
 196   /* Used by scalar operands that still need to be parsed.  */
 197   long junk ATTRIBUTE_UNUSED;
 198
 199   switch (opindex)
 200     {
 201     case XSTORMY16_OPERAND_RB :
 202       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_Rb_names, & fields->f_Rb);
 203       break;
 204     case XSTORMY16_OPERAND_RBJ :
 205       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_Rb_names, & fields->f_Rbj);
 206       break;
 207     case XSTORMY16_OPERAND_RD :
 208       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rd);
 209       break;
 210     case XSTORMY16_OPERAND_RDM :
 211       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rdm);
 212       break;
 213     case XSTORMY16_OPERAND_RM :
 214       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rm);
 215       break;
 216     case XSTORMY16_OPERAND_RS :
 217       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_gr_names, & fields->f_Rs);
 218       break;
 219     case XSTORMY16_OPERAND_ABS24 :
 220       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_ABS24, (unsigned long *) (& fields->f_abs24));
 221       break;
 222     case XSTORMY16_OPERAND_BCOND2 :
 223       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_branchcond, & fields->f_op2);
 224       break;
 225     case XSTORMY16_OPERAND_BCOND5 :
 226       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_branchcond, & fields->f_op5);
 227       break;
 228     case XSTORMY16_OPERAND_HMEM8 :
 229       errmsg = parse_mem8 (cd, strp, XSTORMY16_OPERAND_HMEM8, (unsigned long *) (& fields->f_hmem8));
 230       break;
 231     case XSTORMY16_OPERAND_IMM12 :
 232       errmsg = cgen_parse_signed_integer (cd, strp, XSTORMY16_OPERAND_IMM12, (long *) (& fields->f_imm12));
 233       break;
 234     case XSTORMY16_OPERAND_IMM16 :
 235       errmsg = parse_immediate16 (cd, strp, XSTORMY16_OPERAND_IMM16, (unsigned long *) (& fields->f_imm16));
 236       break;
 237     case XSTORMY16_OPERAND_IMM2 :
 238       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM2, (unsigned long *) (& fields->f_imm2));
 239       break;
 240     case XSTORMY16_OPERAND_IMM3 :
 241       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM3, (unsigned long *) (& fields->f_imm3));
 242       break;
 243     case XSTORMY16_OPERAND_IMM3B :
 244       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM3B, (unsigned long *) (& fields->f_imm3b));
 245       break;
 246     case XSTORMY16_OPERAND_IMM4 :
 247       errmsg = parse_small_immediate (cd, strp, XSTORMY16_OPERAND_IMM4, (unsigned long *) (& fields->f_imm4));
 248       break;
 249     case XSTORMY16_OPERAND_IMM8 :
 250       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_IMM8, (unsigned long *) (& fields->f_imm8));
 251       break;
 252     case XSTORMY16_OPERAND_IMM8SMALL :
 253       errmsg = parse_small_immediate (cd, strp, XSTORMY16_OPERAND_IMM8SMALL, (unsigned long *) (& fields->f_imm8));
 254       break;
 255     case XSTORMY16_OPERAND_LMEM8 :
 256       errmsg = parse_mem8 (cd, strp, XSTORMY16_OPERAND_LMEM8, (unsigned long *) (& fields->f_lmem8));
 257       break;
 258     case XSTORMY16_OPERAND_REL12 :
 259       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL12, (unsigned long *) (& fields->f_rel12));
 260       break;
 261     case XSTORMY16_OPERAND_REL12A :
 262       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL12A, (unsigned long *) (& fields->f_rel12a));
 263       break;
 264     case XSTORMY16_OPERAND_REL8_2 :
 265       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL8_2, (unsigned long *) (& fields->f_rel8_2));
 266       break;
 267     case XSTORMY16_OPERAND_REL8_4 :
 268       errmsg = cgen_parse_unsigned_integer (cd, strp, XSTORMY16_OPERAND_REL8_4, (unsigned long *) (& fields->f_rel8_4));
 269       break;
 270     case XSTORMY16_OPERAND_WS2 :
 271       errmsg = cgen_parse_keyword (cd, strp, & xstormy16_cgen_opval_h_wordsize, & fields->f_op2m);
 272       break;
 273
 274     default :
 275       /* xgettext:c-format */
 276       opcodes_error_handler
 277         (_("internal error: unrecognized field %d while parsing"),
 278          opindex);
 279       abort ();
 280   }
 281
 282   return errmsg;
 283 }
 284
 285 cgen_parse_fn * const xstormy16_cgen_parse_handlers[] =
 286 {
 287   parse_insn_normal,
 288 };
 289
 290 void
 291 xstormy16_cgen_init_asm (CGEN_CPU_DESC cd)
 292 {
 293   xstormy16_cgen_init_opcode_table (cd);
 294   xstormy16_cgen_init_ibld_table (cd);
 295   cd->parse_handlers = & xstormy16_cgen_parse_handlers[0];
 296   cd->parse_operand = xstormy16_cgen_parse_operand;
 297 #ifdef CGEN_ASM_INIT_HOOK
 298 CGEN_ASM_INIT_HOOK
 299 #endif
 300 }
 301
 302 \f
 303
 304 /* Regex construction routine.
 305
 306    This translates an opcode syntax string into a regex string,
 307    by replacing any non-character syntax element (such as an
 308    opcode) with the pattern '.*'
 309
 310    It then compiles the regex and stores it in the opcode, for
 311    later use by xstormy16_cgen_assemble_insn
 312
 313    Returns NULL for success, an error message for failure.  */
 314
 315 char *
 316 xstormy16_cgen_build_insn_regex (CGEN_INSN *insn)
 317 {
 318   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 319   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 320   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 321   char *rx = rxbuf;
 322   const CGEN_SYNTAX_CHAR_TYPE *syn;
 323   int reg_err;
 324
 325   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 326
 327   /* Mnemonics come first in the syntax string.  */
 328   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 329     return _("missing mnemonic in syntax string");
 330   ++syn;
 331
 332   /* Generate a case sensitive regular expression that emulates case
 333      insensitive matching in the "C" locale.  We cannot generate a case
 334      insensitive regular expression because in Turkish locales, 'i' and 'I'
 335      are not equal modulo case conversion.  */
 336
 337   /* Copy the literal mnemonic out of the insn.  */
 338   for (; *mnem; mnem++)
 339     {
 340       char c = *mnem;
 341
 342       if (ISALPHA (c))
 343         {
 344           *rx++ = '[';
 345           *rx++ = TOLOWER (c);
 346           *rx++ = TOUPPER (c);
 347           *rx++ = ']';
 348         }
 349       else
 350         *rx++ = c;
 351     }
 352
 353   /* Copy any remaining literals from the syntax string into the rx.  */
 354   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 355     {
 356       if (CGEN_SYNTAX_CHAR_P (* syn))
 357         {
 358           char c = CGEN_SYNTAX_CHAR (* syn);
 359
 360           switch (c)
 361             {
 362               /* Escape any regex metacharacters in the syntax.  */
 363             case '.': case '[': case '\\':
 364             case '*': case '^': case '$':
 365
 366 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 367             case '?': case '{': case '}':
 368             case '(': case ')': case '*':
 369             case '|': case '+': case ']':
 370 #endif
 371               *rx++ = '\\';
 372               *rx++ = c;
 373               break;
 374
 375             default:
 376               if (ISALPHA (c))
 377                 {
 378                   *rx++ = '[';
 379                   *rx++ = TOLOWER (c);
 380                   *rx++ = TOUPPER (c);
 381                   *rx++ = ']';
 382                 }
 383               else
 384                 *rx++ = c;
 385               break;
 386             }
 387         }
 388       else
 389         {
 390           /* Replace non-syntax fields with globs.  */
 391           *rx++ = '.';
 392           *rx++ = '*';
 393         }
 394     }
 395
 396   /* Trailing whitespace ok.  */
 397   * rx++ = '[';
 398   * rx++ = ' ';
 399   * rx++ = '\t';
 400   * rx++ = ']';
 401   * rx++ = '*';
 402
 403   /* But anchor it after that.  */
 404   * rx++ = '$';
 405   * rx = '\0';
 406
 407   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 408   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 409
 410   if (reg_err == 0)
 411     return NULL;
 412   else
 413     {
 414       static char msg[80];
 415
 416       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 417       regfree ((regex_t *) CGEN_INSN_RX (insn));
 418       free (CGEN_INSN_RX (insn));
 419       (CGEN_INSN_RX (insn)) = NULL;
 420       return msg;
 421     }
 422 }
 423
 424 \f
 425 /* Default insn parser.
 426
 427    The syntax string is scanned and operands are parsed and stored in FIELDS.
 428    Relocs are queued as we go via other callbacks.
 429
 430    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 431    parse the instruction, we return 0 and the caller will start over from
 432    the beginning.  Backtracking will be necessary in parsing subexpressions,
 433    but that can be handled there.  Not handling backtracking here may get
 434    expensive in the case of the m68k.  Deal with later.
 435
 436    Returns NULL for success, an error message for failure.  */
 437
 438 static const char *
 439 parse_insn_normal (CGEN_CPU_DESC cd,
 440                    const CGEN_INSN *insn,
 441                    const char **strp,
 442                    CGEN_FIELDS *fields)
 443 {
 444   /* ??? Runtime added insns not handled yet.  */
 445   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 446   const char *str = *strp;
 447   const char *errmsg;
 448   const char *p;
 449   const CGEN_SYNTAX_CHAR_TYPE * syn;
 450 #ifdef CGEN_MNEMONIC_OPERANDS
 451   /* FIXME: wip */
 452   int past_opcode_p;
 453 #endif
 454
 455   /* For now we assume the mnemonic is first (there are no leading operands).
 456      We can parse it without needing to set up operand parsing.
 457      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 458      not be called from GAS.  */
 459   p = CGEN_INSN_MNEMONIC (insn);
 460   while (*p && TOLOWER (*p) == TOLOWER (*str))
 461     ++p, ++str;
 462
 463   if (* p)
 464     return _("unrecognized instruction");
 465
 466 #ifndef CGEN_MNEMONIC_OPERANDS
 467   if (* str && ! ISSPACE (* str))
 468     return _("unrecognized instruction");
 469 #endif
 470
 471   CGEN_INIT_PARSE (cd);
 472   cgen_init_parse_operand (cd);
 473 #ifdef CGEN_MNEMONIC_OPERANDS
 474   past_opcode_p = 0;
 475 #endif
 476
 477   /* We don't check for (*str != '\0') here because we want to parse
 478      any trailing fake arguments in the syntax string.  */
 479   syn = CGEN_SYNTAX_STRING (syntax);
 480
 481   /* Mnemonics come first for now, ensure valid string.  */
 482   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 483     abort ();
 484
 485   ++syn;
 486
 487   while (* syn != 0)
 488     {
 489       /* Non operand chars must match exactly.  */
 490       if (CGEN_SYNTAX_CHAR_P (* syn))
 491         {
 492           /* FIXME: While we allow for non-GAS callers above, we assume the
 493              first char after the mnemonic part is a space.  */
 494           /* FIXME: We also take inappropriate advantage of the fact that
 495              GAS's input scrubber will remove extraneous blanks.  */
 496           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 497             {
 498 #ifdef CGEN_MNEMONIC_OPERANDS
 499               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 500                 past_opcode_p = 1;
 501 #endif
 502               ++ syn;
 503               ++ str;
 504             }
 505           else if (*str)
 506             {
 507               /* Syntax char didn't match.  Can't be this insn.  */
 508               static char msg [80];
 509
 510               /* xgettext:c-format */
 511               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 512                        CGEN_SYNTAX_CHAR(*syn), *str);
 513               return msg;
 514             }
 515           else
 516             {
 517               /* Ran out of input.  */
 518               static char msg [80];
 519
 520               /* xgettext:c-format */
 521               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 522                        CGEN_SYNTAX_CHAR(*syn));
 523               return msg;
 524             }
 525           continue;
 526         }
 527
 528 #ifdef CGEN_MNEMONIC_OPERANDS
 529       (void) past_opcode_p;
 530 #endif
 531       /* We have an operand of some sort.  */
 532       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 533       if (errmsg)
 534         return errmsg;
 535
 536       /* Done with this operand, continue with next one.  */
 537       ++ syn;
 538     }
 539
 540   /* If we're at the end of the syntax string, we're done.  */
 541   if (* syn == 0)
 542     {
 543       /* FIXME: For the moment we assume a valid `str' can only contain
 544          blanks now.  IE: We needn't try again with a longer version of
 545          the insn and it is assumed that longer versions of insns appear
 546          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 547       while (ISSPACE (* str))
 548         ++ str;
 549
 550       if (* str != '\0')
 551         return _("junk at end of line"); /* FIXME: would like to include `str' */
 552
 553       return NULL;
 554     }
 555
 556   /* We couldn't parse it.  */
 557   return _("unrecognized instruction");
 558 }
 559 \f
 560 /* Main entry point.
 561    This routine is called for each instruction to be assembled.
 562    STR points to the insn to be assembled.
 563    We assume all necessary tables have been initialized.
 564    The assembled instruction, less any fixups, is stored in BUF.
 565    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 566    still needs to be converted to target byte order, otherwise BUF is an array
 567    of bytes in target byte order.
 568    The result is a pointer to the insn's entry in the opcode table,
 569    or NULL if an error occured (an error message will have already been
 570    printed).
 571
 572    Note that when processing (non-alias) macro-insns,
 573    this function recurses.
 574
 575    ??? It's possible to make this cpu-independent.
 576    One would have to deal with a few minor things.
 577    At this point in time doing so would be more of a curiosity than useful
 578    [for example this file isn't _that_ big], but keeping the possibility in
 579    mind helps keep the design clean.  */
 580
 581 const CGEN_INSN *
 582 xstormy16_cgen_assemble_insn (CGEN_CPU_DESC cd,
 583                            const char *str,
 584                            CGEN_FIELDS *fields,
 585                            CGEN_INSN_BYTES_PTR buf,
 586                            char **errmsg)
 587 {
 588   const char *start;
 589   CGEN_INSN_LIST *ilist;
 590   const char *parse_errmsg = NULL;
 591   const char *insert_errmsg = NULL;
 592   int recognized_mnemonic = 0;
 593
 594   /* Skip leading white space.  */
 595   while (ISSPACE (* str))
 596     ++ str;
 597
 598   /* The instructions are stored in hashed lists.
 599      Get the first in the list.  */
 600   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 601
 602   /* Keep looking until we find a match.  */
 603   start = str;
 604   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 605     {
 606       const CGEN_INSN *insn = ilist->insn;
 607       recognized_mnemonic = 1;
 608
 609 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 610       /* Not usually needed as unsupported opcodes
 611          shouldn't be in the hash lists.  */
 612       /* Is this insn supported by the selected cpu?  */
 613       if (! xstormy16_cgen_insn_supported (cd, insn))
 614         continue;
 615 #endif
 616       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 617          chosen immediately.  Instead, it is used during assembler/linker
 618          relaxation if possible.  */
 619       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 620         continue;
 621
 622       str = start;
 623
 624       /* Skip this insn if str doesn't look right lexically.  */
 625       if (CGEN_INSN_RX (insn) != NULL &&
 626           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 627         continue;
 628
 629       /* Allow parse/insert handlers to obtain length of insn.  */
 630       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 631
 632       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 633       if (parse_errmsg != NULL)
 634         continue;
 635
 636       /* ??? 0 is passed for `pc'.  */
 637       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 638                                                  (bfd_vma) 0);
 639       if (insert_errmsg != NULL)
 640         continue;
 641
 642       /* It is up to the caller to actually output the insn and any
 643          queued relocs.  */
 644       return insn;
 645     }
 646
 647   {
 648     static char errbuf[150];
 649     const char *tmp_errmsg;
 650 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 651 #define be_verbose 1
 652 #else
 653 #define be_verbose 0
 654 #endif
 655
 656     if (be_verbose)
 657       {
 658         /* If requesting verbose error messages, use insert_errmsg.
 659            Failing that, use parse_errmsg.  */
 660         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 661                       parse_errmsg ? parse_errmsg :
 662                       recognized_mnemonic ?
 663                       _("unrecognized form of instruction") :
 664                       _("unrecognized instruction"));
 665
 666         if (strlen (start) > 50)
 667           /* xgettext:c-format */
 668           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 669         else
 670           /* xgettext:c-format */
 671           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 672       }
 673     else
 674       {
 675         if (strlen (start) > 50)
 676           /* xgettext:c-format */
 677           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 678         else
 679           /* xgettext:c-format */
 680           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 681       }
 682
 683     *errmsg = errbuf;
 684     return NULL;
 685   }
 686 }