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, 2007, 2008, 2010
   8    Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26
  27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  28    Keep that in mind.  */
  29
  30 #include "sysdep.h"
  31 #include <stdio.h>
  32 #include "ansidecl.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "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       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 277       abort ();
 278   }
 279
 280   return errmsg;
 281 }
 282
 283 cgen_parse_fn * const xstormy16_cgen_parse_handlers[] =
 284 {
 285   parse_insn_normal,
 286 };
 287
 288 void
 289 xstormy16_cgen_init_asm (CGEN_CPU_DESC cd)
 290 {
 291   xstormy16_cgen_init_opcode_table (cd);
 292   xstormy16_cgen_init_ibld_table (cd);
 293   cd->parse_handlers = & xstormy16_cgen_parse_handlers[0];
 294   cd->parse_operand = xstormy16_cgen_parse_operand;
 295 #ifdef CGEN_ASM_INIT_HOOK
 296 CGEN_ASM_INIT_HOOK
 297 #endif
 298 }
 299
 300 \f
 301
 302 /* Regex construction routine.
 303
 304    This translates an opcode syntax string into a regex string,
 305    by replacing any non-character syntax element (such as an
 306    opcode) with the pattern '.*'
 307
 308    It then compiles the regex and stores it in the opcode, for
 309    later use by xstormy16_cgen_assemble_insn
 310
 311    Returns NULL for success, an error message for failure.  */
 312
 313 char *
 314 xstormy16_cgen_build_insn_regex (CGEN_INSN *insn)
 315 {
 316   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 317   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 318   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 319   char *rx = rxbuf;
 320   const CGEN_SYNTAX_CHAR_TYPE *syn;
 321   int reg_err;
 322
 323   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 324
 325   /* Mnemonics come first in the syntax string.  */
 326   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 327     return _("missing mnemonic in syntax string");
 328   ++syn;
 329
 330   /* Generate a case sensitive regular expression that emulates case
 331      insensitive matching in the "C" locale.  We cannot generate a case
 332      insensitive regular expression because in Turkish locales, 'i' and 'I'
 333      are not equal modulo case conversion.  */
 334
 335   /* Copy the literal mnemonic out of the insn.  */
 336   for (; *mnem; mnem++)
 337     {
 338       char c = *mnem;
 339
 340       if (ISALPHA (c))
 341         {
 342           *rx++ = '[';
 343           *rx++ = TOLOWER (c);
 344           *rx++ = TOUPPER (c);
 345           *rx++ = ']';
 346         }
 347       else
 348         *rx++ = c;
 349     }
 350
 351   /* Copy any remaining literals from the syntax string into the rx.  */
 352   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 353     {
 354       if (CGEN_SYNTAX_CHAR_P (* syn))
 355         {
 356           char c = CGEN_SYNTAX_CHAR (* syn);
 357
 358           switch (c)
 359             {
 360               /* Escape any regex metacharacters in the syntax.  */
 361             case '.': case '[': case '\\':
 362             case '*': case '^': case '$':
 363
 364 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 365             case '?': case '{': case '}':
 366             case '(': case ')': case '*':
 367             case '|': case '+': case ']':
 368 #endif
 369               *rx++ = '\\';
 370               *rx++ = c;
 371               break;
 372
 373             default:
 374               if (ISALPHA (c))
 375                 {
 376                   *rx++ = '[';
 377                   *rx++ = TOLOWER (c);
 378                   *rx++ = TOUPPER (c);
 379                   *rx++ = ']';
 380                 }
 381               else
 382                 *rx++ = c;
 383               break;
 384             }
 385         }
 386       else
 387         {
 388           /* Replace non-syntax fields with globs.  */
 389           *rx++ = '.';
 390           *rx++ = '*';
 391         }
 392     }
 393
 394   /* Trailing whitespace ok.  */
 395   * rx++ = '[';
 396   * rx++ = ' ';
 397   * rx++ = '\t';
 398   * rx++ = ']';
 399   * rx++ = '*';
 400
 401   /* But anchor it after that.  */
 402   * rx++ = '$';
 403   * rx = '\0';
 404
 405   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 406   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 407
 408   if (reg_err == 0)
 409     return NULL;
 410   else
 411     {
 412       static char msg[80];
 413
 414       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 415       regfree ((regex_t *) CGEN_INSN_RX (insn));
 416       free (CGEN_INSN_RX (insn));
 417       (CGEN_INSN_RX (insn)) = NULL;
 418       return msg;
 419     }
 420 }
 421
 422 \f
 423 /* Default insn parser.
 424
 425    The syntax string is scanned and operands are parsed and stored in FIELDS.
 426    Relocs are queued as we go via other callbacks.
 427
 428    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 429    parse the instruction, we return 0 and the caller will start over from
 430    the beginning.  Backtracking will be necessary in parsing subexpressions,
 431    but that can be handled there.  Not handling backtracking here may get
 432    expensive in the case of the m68k.  Deal with later.
 433
 434    Returns NULL for success, an error message for failure.  */
 435
 436 static const char *
 437 parse_insn_normal (CGEN_CPU_DESC cd,
 438                    const CGEN_INSN *insn,
 439                    const char **strp,
 440                    CGEN_FIELDS *fields)
 441 {
 442   /* ??? Runtime added insns not handled yet.  */
 443   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 444   const char *str = *strp;
 445   const char *errmsg;
 446   const char *p;
 447   const CGEN_SYNTAX_CHAR_TYPE * syn;
 448 #ifdef CGEN_MNEMONIC_OPERANDS
 449   /* FIXME: wip */
 450   int past_opcode_p;
 451 #endif
 452
 453   /* For now we assume the mnemonic is first (there are no leading operands).
 454      We can parse it without needing to set up operand parsing.
 455      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 456      not be called from GAS.  */
 457   p = CGEN_INSN_MNEMONIC (insn);
 458   while (*p && TOLOWER (*p) == TOLOWER (*str))
 459     ++p, ++str;
 460
 461   if (* p)
 462     return _("unrecognized instruction");
 463
 464 #ifndef CGEN_MNEMONIC_OPERANDS
 465   if (* str && ! ISSPACE (* str))
 466     return _("unrecognized instruction");
 467 #endif
 468
 469   CGEN_INIT_PARSE (cd);
 470   cgen_init_parse_operand (cd);
 471 #ifdef CGEN_MNEMONIC_OPERANDS
 472   past_opcode_p = 0;
 473 #endif
 474
 475   /* We don't check for (*str != '\0') here because we want to parse
 476      any trailing fake arguments in the syntax string.  */
 477   syn = CGEN_SYNTAX_STRING (syntax);
 478
 479   /* Mnemonics come first for now, ensure valid string.  */
 480   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 481     abort ();
 482
 483   ++syn;
 484
 485   while (* syn != 0)
 486     {
 487       /* Non operand chars must match exactly.  */
 488       if (CGEN_SYNTAX_CHAR_P (* syn))
 489         {
 490           /* FIXME: While we allow for non-GAS callers above, we assume the
 491              first char after the mnemonic part is a space.  */
 492           /* FIXME: We also take inappropriate advantage of the fact that
 493              GAS's input scrubber will remove extraneous blanks.  */
 494           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 495             {
 496 #ifdef CGEN_MNEMONIC_OPERANDS
 497               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 498                 past_opcode_p = 1;
 499 #endif
 500               ++ syn;
 501               ++ str;
 502             }
 503           else if (*str)
 504             {
 505               /* Syntax char didn't match.  Can't be this insn.  */
 506               static char msg [80];
 507
 508               /* xgettext:c-format */
 509               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 510                        CGEN_SYNTAX_CHAR(*syn), *str);
 511               return msg;
 512             }
 513           else
 514             {
 515               /* Ran out of input.  */
 516               static char msg [80];
 517
 518               /* xgettext:c-format */
 519               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 520                        CGEN_SYNTAX_CHAR(*syn));
 521               return msg;
 522             }
 523           continue;
 524         }
 525
 526 #ifdef CGEN_MNEMONIC_OPERANDS
 527       (void) past_opcode_p;
 528 #endif
 529       /* We have an operand of some sort.  */
 530       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 531       if (errmsg)
 532         return errmsg;
 533
 534       /* Done with this operand, continue with next one.  */
 535       ++ syn;
 536     }
 537
 538   /* If we're at the end of the syntax string, we're done.  */
 539   if (* syn == 0)
 540     {
 541       /* FIXME: For the moment we assume a valid `str' can only contain
 542          blanks now.  IE: We needn't try again with a longer version of
 543          the insn and it is assumed that longer versions of insns appear
 544          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 545       while (ISSPACE (* str))
 546         ++ str;
 547
 548       if (* str != '\0')
 549         return _("junk at end of line"); /* FIXME: would like to include `str' */
 550
 551       return NULL;
 552     }
 553
 554   /* We couldn't parse it.  */
 555   return _("unrecognized instruction");
 556 }
 557 \f
 558 /* Main entry point.
 559    This routine is called for each instruction to be assembled.
 560    STR points to the insn to be assembled.
 561    We assume all necessary tables have been initialized.
 562    The assembled instruction, less any fixups, is stored in BUF.
 563    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 564    still needs to be converted to target byte order, otherwise BUF is an array
 565    of bytes in target byte order.
 566    The result is a pointer to the insn's entry in the opcode table,
 567    or NULL if an error occured (an error message will have already been
 568    printed).
 569
 570    Note that when processing (non-alias) macro-insns,
 571    this function recurses.
 572
 573    ??? It's possible to make this cpu-independent.
 574    One would have to deal with a few minor things.
 575    At this point in time doing so would be more of a curiosity than useful
 576    [for example this file isn't _that_ big], but keeping the possibility in
 577    mind helps keep the design clean.  */
 578
 579 const CGEN_INSN *
 580 xstormy16_cgen_assemble_insn (CGEN_CPU_DESC cd,
 581                            const char *str,
 582                            CGEN_FIELDS *fields,
 583                            CGEN_INSN_BYTES_PTR buf,
 584                            char **errmsg)
 585 {
 586   const char *start;
 587   CGEN_INSN_LIST *ilist;
 588   const char *parse_errmsg = NULL;
 589   const char *insert_errmsg = NULL;
 590   int recognized_mnemonic = 0;
 591
 592   /* Skip leading white space.  */
 593   while (ISSPACE (* str))
 594     ++ str;
 595
 596   /* The instructions are stored in hashed lists.
 597      Get the first in the list.  */
 598   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 599
 600   /* Keep looking until we find a match.  */
 601   start = str;
 602   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 603     {
 604       const CGEN_INSN *insn = ilist->insn;
 605       recognized_mnemonic = 1;
 606
 607 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 608       /* Not usually needed as unsupported opcodes
 609          shouldn't be in the hash lists.  */
 610       /* Is this insn supported by the selected cpu?  */
 611       if (! xstormy16_cgen_insn_supported (cd, insn))
 612         continue;
 613 #endif
 614       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 615          chosen immediately.  Instead, it is used during assembler/linker
 616          relaxation if possible.  */
 617       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 618         continue;
 619
 620       str = start;
 621
 622       /* Skip this insn if str doesn't look right lexically.  */
 623       if (CGEN_INSN_RX (insn) != NULL &&
 624           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 625         continue;
 626
 627       /* Allow parse/insert handlers to obtain length of insn.  */
 628       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 629
 630       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 631       if (parse_errmsg != NULL)
 632         continue;
 633
 634       /* ??? 0 is passed for `pc'.  */
 635       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 636                                                  (bfd_vma) 0);
 637       if (insert_errmsg != NULL)
 638         continue;
 639
 640       /* It is up to the caller to actually output the insn and any
 641          queued relocs.  */
 642       return insn;
 643     }
 644
 645   {
 646     static char errbuf[150];
 647     const char *tmp_errmsg;
 648 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 649 #define be_verbose 1
 650 #else
 651 #define be_verbose 0
 652 #endif
 653
 654     if (be_verbose)
 655       {
 656         /* If requesting verbose error messages, use insert_errmsg.
 657            Failing that, use parse_errmsg.  */
 658         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 659                       parse_errmsg ? parse_errmsg :
 660                       recognized_mnemonic ?
 661                       _("unrecognized form of instruction") :
 662                       _("unrecognized instruction"));
 663
 664         if (strlen (start) > 50)
 665           /* xgettext:c-format */
 666           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 667         else
 668           /* xgettext:c-format */
 669           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 670       }
 671     else
 672       {
 673         if (strlen (start) > 50)
 674           /* xgettext:c-format */
 675           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 676         else
 677           /* xgettext:c-format */
 678           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 679       }
 680
 681     *errmsg = errbuf;
 682     return NULL;
 683   }
 684 }