opcodes/m32r-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 Free Software Foundation, Inc.
   8
   9 This file is part of the GNU Binutils and GDB, the GNU debugger.
  10
  11 This program is free software; you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation; either version 2, or (at your option)
  14 any later version.
  15
  16 This program is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with this program; if not, write to the Free Software Foundation, Inc.,
  23 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  26    Keep that in mind.  */
  27
  28 #include "sysdep.h"
  29 #include <stdio.h>
  30 #include "ansidecl.h"
  31 #include "bfd.h"
  32 #include "symcat.h"
  33 #include "m32r-desc.h"
  34 #include "m32r-opc.h"
  35 #include "opintl.h"
  36 #include "xregex.h"
  37 #include "libiberty.h"
  38 #include "safe-ctype.h"
  39
  40 #undef  min
  41 #define min(a,b) ((a) < (b) ? (a) : (b))
  42 #undef  max
  43 #define max(a,b) ((a) > (b) ? (a) : (b))
  44
  45 static const char * parse_insn_normal
  46   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  47 \f
  48 /* -- assembler routines inserted here.  */
  49
  50 /* -- asm.c */
  51 static const char * parse_hash
  52   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  53 static const char * parse_hi16
  54   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  55 static const char * parse_slo16
  56   PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
  57 static const char * parse_ulo16
  58   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  59
  60 /* Handle '#' prefixes (i.e. skip over them).  */
  61
  62 static const char *
  63 parse_hash (cd, strp, opindex, valuep)
  64      CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
  65      const char **strp;
  66      int opindex ATTRIBUTE_UNUSED;
  67      unsigned long *valuep ATTRIBUTE_UNUSED;
  68 {
  69   if (**strp == '#')
  70     ++*strp;
  71   return NULL;
  72 }
  73
  74 /* Handle shigh(), high().  */
  75
  76 static const char *
  77 parse_hi16 (cd, strp, opindex, valuep)
  78      CGEN_CPU_DESC cd;
  79      const char **strp;
  80      int opindex;
  81      unsigned long *valuep;
  82 {
  83   const char *errmsg;
  84   enum cgen_parse_operand_result result_type;
  85   bfd_vma value;
  86
  87   if (**strp == '#')
  88     ++*strp;
  89
  90   if (strncasecmp (*strp, "high(", 5) == 0)
  91     {
  92       *strp += 5;
  93       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
  94                                    &result_type, &value);
  95       if (**strp != ')')
  96         return "missing `)'";
  97       ++*strp;
  98       if (errmsg == NULL
  99           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 100         value >>= 16;
 101       *valuep = value;
 102       return errmsg;
 103     }
 104   else if (strncasecmp (*strp, "shigh(", 6) == 0)
 105     {
 106       *strp += 6;
 107       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
 108                                    &result_type, &value);
 109       if (**strp != ')')
 110         return "missing `)'";
 111       ++*strp;
 112       if (errmsg == NULL
 113           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 114         value = (value >> 16) + (value & 0x8000 ? 1 : 0);
 115       *valuep = value;
 116       return errmsg;
 117     }
 118
 119   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 120 }
 121
 122 /* Handle low() in a signed context.  Also handle sda().
 123    The signedness of the value doesn't matter to low(), but this also
 124    handles the case where low() isn't present.  */
 125
 126 static const char *
 127 parse_slo16 (cd, strp, opindex, valuep)
 128      CGEN_CPU_DESC cd;
 129      const char **strp;
 130      int opindex;
 131      long *valuep;
 132 {
 133   const char *errmsg;
 134   enum cgen_parse_operand_result result_type;
 135   bfd_vma value;
 136
 137   if (**strp == '#')
 138     ++*strp;
 139
 140   if (strncasecmp (*strp, "low(", 4) == 0)
 141     {
 142       *strp += 4;
 143       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 144                                    &result_type, &value);
 145       if (**strp != ')')
 146         return "missing `)'";
 147       ++*strp;
 148       if (errmsg == NULL
 149           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 150         value &= 0xffff;
 151       *valuep = value;
 152       return errmsg;
 153     }
 154
 155   if (strncasecmp (*strp, "sda(", 4) == 0)
 156     {
 157       *strp += 4;
 158       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 159                                    NULL, &value);
 160       if (**strp != ')')
 161         return "missing `)'";
 162       ++*strp;
 163       *valuep = value;
 164       return errmsg;
 165     }
 166
 167   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 168 }
 169
 170 /* Handle low() in an unsigned context.
 171    The signedness of the value doesn't matter to low(), but this also
 172    handles the case where low() isn't present.  */
 173
 174 static const char *
 175 parse_ulo16 (cd, strp, opindex, valuep)
 176      CGEN_CPU_DESC cd;
 177      const char **strp;
 178      int opindex;
 179      unsigned long *valuep;
 180 {
 181   const char *errmsg;
 182   enum cgen_parse_operand_result result_type;
 183   bfd_vma value;
 184
 185   if (**strp == '#')
 186     ++*strp;
 187
 188   if (strncasecmp (*strp, "low(", 4) == 0)
 189     {
 190       *strp += 4;
 191       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 192                                    &result_type, &value);
 193       if (**strp != ')')
 194         return "missing `)'";
 195       ++*strp;
 196       if (errmsg == NULL
 197           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 198         value &= 0xffff;
 199       *valuep = value;
 200       return errmsg;
 201     }
 202
 203   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 204 }
 205
 206 /* -- */
 207
 208 const char * m32r_cgen_parse_operand
 209   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 210
 211 /* Main entry point for operand parsing.
 212
 213    This function is basically just a big switch statement.  Earlier versions
 214    used tables to look up the function to use, but
 215    - if the table contains both assembler and disassembler functions then
 216      the disassembler contains much of the assembler and vice-versa,
 217    - there's a lot of inlining possibilities as things grow,
 218    - using a switch statement avoids the function call overhead.
 219
 220    This function could be moved into `parse_insn_normal', but keeping it
 221    separate makes clear the interface between `parse_insn_normal' and each of
 222    the handlers.  */
 223
 224 const char *
 225 m32r_cgen_parse_operand (cd, opindex, strp, fields)
 226      CGEN_CPU_DESC cd;
 227      int opindex;
 228      const char ** strp;
 229      CGEN_FIELDS * fields;
 230 {
 231   const char * errmsg = NULL;
 232   /* Used by scalar operands that still need to be parsed.  */
 233   long junk ATTRIBUTE_UNUSED;
 234
 235   switch (opindex)
 236     {
 237     case M32R_OPERAND_ACC :
 238       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_acc);
 239       break;
 240     case M32R_OPERAND_ACCD :
 241       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accd);
 242       break;
 243     case M32R_OPERAND_ACCS :
 244       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accs);
 245       break;
 246     case M32R_OPERAND_DCR :
 247       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r1);
 248       break;
 249     case M32R_OPERAND_DISP16 :
 250       {
 251         bfd_vma value;
 252         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP16, 0, NULL,  & value);
 253         fields->f_disp16 = value;
 254       }
 255       break;
 256     case M32R_OPERAND_DISP24 :
 257       {
 258         bfd_vma value;
 259         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP24, 0, NULL,  & value);
 260         fields->f_disp24 = value;
 261       }
 262       break;
 263     case M32R_OPERAND_DISP8 :
 264       {
 265         bfd_vma value;
 266         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP8, 0, NULL,  & value);
 267         fields->f_disp8 = value;
 268       }
 269       break;
 270     case M32R_OPERAND_DR :
 271       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 272       break;
 273     case M32R_OPERAND_HASH :
 274       errmsg = parse_hash (cd, strp, M32R_OPERAND_HASH, &junk);
 275       break;
 276     case M32R_OPERAND_HI16 :
 277       errmsg = parse_hi16 (cd, strp, M32R_OPERAND_HI16, &fields->f_hi16);
 278       break;
 279     case M32R_OPERAND_IMM1 :
 280       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_IMM1, &fields->f_imm1);
 281       break;
 282     case M32R_OPERAND_SCR :
 283       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r2);
 284       break;
 285     case M32R_OPERAND_SIMM16 :
 286       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM16, &fields->f_simm16);
 287       break;
 288     case M32R_OPERAND_SIMM8 :
 289       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM8, &fields->f_simm8);
 290       break;
 291     case M32R_OPERAND_SLO16 :
 292       errmsg = parse_slo16 (cd, strp, M32R_OPERAND_SLO16, &fields->f_simm16);
 293       break;
 294     case M32R_OPERAND_SR :
 295       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 296       break;
 297     case M32R_OPERAND_SRC1 :
 298       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 299       break;
 300     case M32R_OPERAND_SRC2 :
 301       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 302       break;
 303     case M32R_OPERAND_UIMM16 :
 304       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM16, &fields->f_uimm16);
 305       break;
 306     case M32R_OPERAND_UIMM24 :
 307       {
 308         bfd_vma value;
 309         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_UIMM24, 0, NULL,  & value);
 310         fields->f_uimm24 = value;
 311       }
 312       break;
 313     case M32R_OPERAND_UIMM4 :
 314       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM4, &fields->f_uimm4);
 315       break;
 316     case M32R_OPERAND_UIMM5 :
 317       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM5, &fields->f_uimm5);
 318       break;
 319     case M32R_OPERAND_ULO16 :
 320       errmsg = parse_ulo16 (cd, strp, M32R_OPERAND_ULO16, &fields->f_uimm16);
 321       break;
 322
 323     default :
 324       /* xgettext:c-format */
 325       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 326       abort ();
 327   }
 328
 329   return errmsg;
 330 }
 331
 332 cgen_parse_fn * const m32r_cgen_parse_handlers[] =
 333 {
 334   parse_insn_normal,
 335 };
 336
 337 void
 338 m32r_cgen_init_asm (cd)
 339      CGEN_CPU_DESC cd;
 340 {
 341   m32r_cgen_init_opcode_table (cd);
 342   m32r_cgen_init_ibld_table (cd);
 343   cd->parse_handlers = & m32r_cgen_parse_handlers[0];
 344   cd->parse_operand = m32r_cgen_parse_operand;
 345 }
 346
 347 \f
 348
 349 /* Regex construction routine.
 350
 351    This translates an opcode syntax string into a regex string,
 352    by replacing any non-character syntax element (such as an
 353    opcode) with the pattern '.*'
 354
 355    It then compiles the regex and stores it in the opcode, for
 356    later use by m32r_cgen_assemble_insn
 357
 358    Returns NULL for success, an error message for failure.  */
 359
 360 char *
 361 m32r_cgen_build_insn_regex (CGEN_INSN *insn)
 362 {
 363   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 364   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 365   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 366   char *rx = rxbuf;
 367   const CGEN_SYNTAX_CHAR_TYPE *syn;
 368   int reg_err;
 369
 370   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 371
 372   /* Mnemonics come first in the syntax string.  */
 373   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 374     return _("missing mnemonic in syntax string");
 375   ++syn;
 376
 377   /* Generate a case sensitive regular expression that emulates case
 378      insensitive matching in the "C" locale.  We cannot generate a case
 379      insensitive regular expression because in Turkish locales, 'i' and 'I'
 380      are not equal modulo case conversion.  */
 381
 382   /* Copy the literal mnemonic out of the insn.  */
 383   for (; *mnem; mnem++)
 384     {
 385       char c = *mnem;
 386
 387       if (ISALPHA (c))
 388         {
 389           *rx++ = '[';
 390           *rx++ = TOLOWER (c);
 391           *rx++ = TOUPPER (c);
 392           *rx++ = ']';
 393         }
 394       else
 395         *rx++ = c;
 396     }
 397
 398   /* Copy any remaining literals from the syntax string into the rx.  */
 399   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 400     {
 401       if (CGEN_SYNTAX_CHAR_P (* syn))
 402         {
 403           char c = CGEN_SYNTAX_CHAR (* syn);
 404
 405           switch (c)
 406             {
 407               /* Escape any regex metacharacters in the syntax.  */
 408             case '.': case '[': case '\\':
 409             case '*': case '^': case '$':
 410
 411 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 412             case '?': case '{': case '}':
 413             case '(': case ')': case '*':
 414             case '|': case '+': case ']':
 415 #endif
 416               *rx++ = '\\';
 417               *rx++ = c;
 418               break;
 419
 420             default:
 421               if (ISALPHA (c))
 422                 {
 423                   *rx++ = '[';
 424                   *rx++ = TOLOWER (c);
 425                   *rx++ = TOUPPER (c);
 426                   *rx++ = ']';
 427                 }
 428               else
 429                 *rx++ = c;
 430               break;
 431             }
 432         }
 433       else
 434         {
 435           /* Replace non-syntax fields with globs.  */
 436           *rx++ = '.';
 437           *rx++ = '*';
 438         }
 439     }
 440
 441   /* Trailing whitespace ok.  */
 442   * rx++ = '[';
 443   * rx++ = ' ';
 444   * rx++ = '\t';
 445   * rx++ = ']';
 446   * rx++ = '*';
 447
 448   /* But anchor it after that.  */
 449   * rx++ = '$';
 450   * rx = '\0';
 451
 452   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 453   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 454
 455   if (reg_err == 0)
 456     return NULL;
 457   else
 458     {
 459       static char msg[80];
 460
 461       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 462       regfree ((regex_t *) CGEN_INSN_RX (insn));
 463       free (CGEN_INSN_RX (insn));
 464       (CGEN_INSN_RX (insn)) = NULL;
 465       return msg;
 466     }
 467 }
 468
 469 \f
 470 /* Default insn parser.
 471
 472    The syntax string is scanned and operands are parsed and stored in FIELDS.
 473    Relocs are queued as we go via other callbacks.
 474
 475    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 476    parse the instruction, we return 0 and the caller will start over from
 477    the beginning.  Backtracking will be necessary in parsing subexpressions,
 478    but that can be handled there.  Not handling backtracking here may get
 479    expensive in the case of the m68k.  Deal with later.
 480
 481    Returns NULL for success, an error message for failure.  */
 482
 483 static const char *
 484 parse_insn_normal (CGEN_CPU_DESC cd,
 485                    const CGEN_INSN *insn,
 486                    const char **strp,
 487                    CGEN_FIELDS *fields)
 488 {
 489   /* ??? Runtime added insns not handled yet.  */
 490   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 491   const char *str = *strp;
 492   const char *errmsg;
 493   const char *p;
 494   const CGEN_SYNTAX_CHAR_TYPE * syn;
 495 #ifdef CGEN_MNEMONIC_OPERANDS
 496   /* FIXME: wip */
 497   int past_opcode_p;
 498 #endif
 499
 500   /* For now we assume the mnemonic is first (there are no leading operands).
 501      We can parse it without needing to set up operand parsing.
 502      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 503      not be called from GAS.  */
 504   p = CGEN_INSN_MNEMONIC (insn);
 505   while (*p && TOLOWER (*p) == TOLOWER (*str))
 506     ++p, ++str;
 507
 508   if (* p)
 509     return _("unrecognized instruction");
 510
 511 #ifndef CGEN_MNEMONIC_OPERANDS
 512   if (* str && ! ISSPACE (* str))
 513     return _("unrecognized instruction");
 514 #endif
 515
 516   CGEN_INIT_PARSE (cd);
 517   cgen_init_parse_operand (cd);
 518 #ifdef CGEN_MNEMONIC_OPERANDS
 519   past_opcode_p = 0;
 520 #endif
 521
 522   /* We don't check for (*str != '\0') here because we want to parse
 523      any trailing fake arguments in the syntax string.  */
 524   syn = CGEN_SYNTAX_STRING (syntax);
 525
 526   /* Mnemonics come first for now, ensure valid string.  */
 527   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 528     abort ();
 529
 530   ++syn;
 531
 532   while (* syn != 0)
 533     {
 534       /* Non operand chars must match exactly.  */
 535       if (CGEN_SYNTAX_CHAR_P (* syn))
 536         {
 537           /* FIXME: While we allow for non-GAS callers above, we assume the
 538              first char after the mnemonic part is a space.  */
 539           /* FIXME: We also take inappropriate advantage of the fact that
 540              GAS's input scrubber will remove extraneous blanks.  */
 541           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 542             {
 543 #ifdef CGEN_MNEMONIC_OPERANDS
 544               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 545                 past_opcode_p = 1;
 546 #endif
 547               ++ syn;
 548               ++ str;
 549             }
 550           else if (*str)
 551             {
 552               /* Syntax char didn't match.  Can't be this insn.  */
 553               static char msg [80];
 554
 555               /* xgettext:c-format */
 556               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 557                        CGEN_SYNTAX_CHAR(*syn), *str);
 558               return msg;
 559             }
 560           else
 561             {
 562               /* Ran out of input.  */
 563               static char msg [80];
 564
 565               /* xgettext:c-format */
 566               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 567                        CGEN_SYNTAX_CHAR(*syn));
 568               return msg;
 569             }
 570           continue;
 571         }
 572
 573       /* We have an operand of some sort.  */
 574       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 575                                           &str, fields);
 576       if (errmsg)
 577         return errmsg;
 578
 579       /* Done with this operand, continue with next one.  */
 580       ++ syn;
 581     }
 582
 583   /* If we're at the end of the syntax string, we're done.  */
 584   if (* syn == 0)
 585     {
 586       /* FIXME: For the moment we assume a valid `str' can only contain
 587          blanks now.  IE: We needn't try again with a longer version of
 588          the insn and it is assumed that longer versions of insns appear
 589          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 590       while (ISSPACE (* str))
 591         ++ str;
 592
 593       if (* str != '\0')
 594         return _("junk at end of line"); /* FIXME: would like to include `str' */
 595
 596       return NULL;
 597     }
 598
 599   /* We couldn't parse it.  */
 600   return _("unrecognized instruction");
 601 }
 602 \f
 603 /* Main entry point.
 604    This routine is called for each instruction to be assembled.
 605    STR points to the insn to be assembled.
 606    We assume all necessary tables have been initialized.
 607    The assembled instruction, less any fixups, is stored in BUF.
 608    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 609    still needs to be converted to target byte order, otherwise BUF is an array
 610    of bytes in target byte order.
 611    The result is a pointer to the insn's entry in the opcode table,
 612    or NULL if an error occured (an error message will have already been
 613    printed).
 614
 615    Note that when processing (non-alias) macro-insns,
 616    this function recurses.
 617
 618    ??? It's possible to make this cpu-independent.
 619    One would have to deal with a few minor things.
 620    At this point in time doing so would be more of a curiosity than useful
 621    [for example this file isn't _that_ big], but keeping the possibility in
 622    mind helps keep the design clean.  */
 623
 624 const CGEN_INSN *
 625 m32r_cgen_assemble_insn (CGEN_CPU_DESC cd,
 626                            const char *str,
 627                            CGEN_FIELDS *fields,
 628                            CGEN_INSN_BYTES_PTR buf,
 629                            char **errmsg)
 630 {
 631   const char *start;
 632   CGEN_INSN_LIST *ilist;
 633   const char *parse_errmsg = NULL;
 634   const char *insert_errmsg = NULL;
 635   int recognized_mnemonic = 0;
 636
 637   /* Skip leading white space.  */
 638   while (ISSPACE (* str))
 639     ++ str;
 640
 641   /* The instructions are stored in hashed lists.
 642      Get the first in the list.  */
 643   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 644
 645   /* Keep looking until we find a match.  */
 646   start = str;
 647   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 648     {
 649       const CGEN_INSN *insn = ilist->insn;
 650       recognized_mnemonic = 1;
 651
 652 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 653       /* Not usually needed as unsupported opcodes
 654          shouldn't be in the hash lists.  */
 655       /* Is this insn supported by the selected cpu?  */
 656       if (! m32r_cgen_insn_supported (cd, insn))
 657         continue;
 658 #endif
 659       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 660          chosen immediately.  Instead, it is used during assembler/linker
 661          relaxation if possible.  */
 662       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 663         continue;
 664
 665       str = start;
 666
 667       /* Skip this insn if str doesn't look right lexically.  */
 668       if (CGEN_INSN_RX (insn) != NULL &&
 669           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 670         continue;
 671
 672       /* Allow parse/insert handlers to obtain length of insn.  */
 673       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 674
 675       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 676       if (parse_errmsg != NULL)
 677         continue;
 678
 679       /* ??? 0 is passed for `pc'.  */
 680       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 681                                                  (bfd_vma) 0);
 682       if (insert_errmsg != NULL)
 683         continue;
 684
 685       /* It is up to the caller to actually output the insn and any
 686          queued relocs.  */
 687       return insn;
 688     }
 689
 690   {
 691     static char errbuf[150];
 692 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 693     const char *tmp_errmsg;
 694
 695     /* If requesting verbose error messages, use insert_errmsg.
 696        Failing that, use parse_errmsg.  */
 697     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 698                   parse_errmsg ? parse_errmsg :
 699                   recognized_mnemonic ?
 700                   _("unrecognized form of instruction") :
 701                   _("unrecognized instruction"));
 702
 703     if (strlen (start) > 50)
 704       /* xgettext:c-format */
 705       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 706     else
 707       /* xgettext:c-format */
 708       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 709 #else
 710     if (strlen (start) > 50)
 711       /* xgettext:c-format */
 712       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 713     else
 714       /* xgettext:c-format */
 715       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 716 #endif
 717
 718     *errmsg = errbuf;
 719     return NULL;
 720   }
 721 }
 722 \f
 723 #if 0 /* This calls back to GAS which we can't do without care.  */
 724
 725 /* Record each member of OPVALS in the assembler's symbol table.
 726    This lets GAS parse registers for us.
 727    ??? Interesting idea but not currently used.  */
 728
 729 /* Record each member of OPVALS in the assembler's symbol table.
 730    FIXME: Not currently used.  */
 731
 732 void
 733 m32r_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals)
 734 {
 735   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 736   const CGEN_KEYWORD_ENTRY * ke;
 737
 738   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 739     {
 740 #if 0 /* Unnecessary, should be done in the search routine.  */
 741       if (! m32r_cgen_opval_supported (ke))
 742         continue;
 743 #endif
 744       cgen_asm_record_register (cd, ke->name, ke->value);
 745     }
 746 }
 747
 748 #endif /* 0 */