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, 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 "m32r-desc.h"
  35 #include "m32r-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 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
  53
  54 /* Handle '#' prefixes (i.e. skip over them).  */
  55
  56 static const char *
  57 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  58             const char **strp,
  59             int opindex ATTRIBUTE_UNUSED,
  60             long *valuep ATTRIBUTE_UNUSED)
  61 {
  62   if (**strp == '#')
  63     ++*strp;
  64   return NULL;
  65 }
  66
  67 /* Handle shigh(), high().  */
  68
  69 static const char *
  70 parse_hi16 (CGEN_CPU_DESC cd,
  71             const char **strp,
  72             int opindex,
  73             unsigned long *valuep)
  74 {
  75   const char *errmsg;
  76   enum cgen_parse_operand_result result_type;
  77   bfd_vma value;
  78
  79   if (**strp == '#')
  80     ++*strp;
  81
  82   if (strncasecmp (*strp, "high(", 5) == 0)
  83     {
  84       *strp += 5;
  85       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
  86                                    & result_type, & value);
  87       if (**strp != ')')
  88         return MISSING_CLOSING_PARENTHESIS;
  89       ++*strp;
  90       if (errmsg == NULL
  91           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
  92         {
  93           value >>= 16;
  94           value &= 0xffff;
  95         }
  96       *valuep = value;
  97       return errmsg;
  98     }
  99   else if (strncasecmp (*strp, "shigh(", 6) == 0)
 100     {
 101       *strp += 6;
 102       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
 103                                    & result_type, & value);
 104       if (**strp != ')')
 105         return MISSING_CLOSING_PARENTHESIS;
 106       ++*strp;
 107       if (errmsg == NULL
 108           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 109         {
 110           value += 0x8000;
 111           value >>= 16;
 112           value &= 0xffff;
 113         }
 114       *valuep = value;
 115       return errmsg;
 116     }
 117
 118   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 119 }
 120
 121 /* Handle low() in a signed context.  Also handle sda().
 122    The signedness of the value doesn't matter to low(), but this also
 123    handles the case where low() isn't present.  */
 124
 125 static const char *
 126 parse_slo16 (CGEN_CPU_DESC cd,
 127              const char ** strp,
 128              int opindex,
 129              long * valuep)
 130 {
 131   const char *errmsg;
 132   enum cgen_parse_operand_result result_type;
 133   bfd_vma value;
 134
 135   if (**strp == '#')
 136     ++*strp;
 137
 138   if (strncasecmp (*strp, "low(", 4) == 0)
 139     {
 140       *strp += 4;
 141       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 142                                    & result_type, & value);
 143       if (**strp != ')')
 144         return MISSING_CLOSING_PARENTHESIS;
 145       ++*strp;
 146       if (errmsg == NULL
 147           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 148         value = ((value & 0xffff) ^ 0x8000) - 0x8000;
 149       *valuep = value;
 150       return errmsg;
 151     }
 152
 153   if (strncasecmp (*strp, "sda(", 4) == 0)
 154     {
 155       *strp += 4;
 156       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 157                                    NULL, & value);
 158       if (**strp != ')')
 159         return MISSING_CLOSING_PARENTHESIS;
 160       ++*strp;
 161       *valuep = value;
 162       return errmsg;
 163     }
 164
 165   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 166 }
 167
 168 /* Handle low() in an unsigned context.
 169    The signedness of the value doesn't matter to low(), but this also
 170    handles the case where low() isn't present.  */
 171
 172 static const char *
 173 parse_ulo16 (CGEN_CPU_DESC cd,
 174              const char **strp,
 175              int opindex,
 176              unsigned long *valuep)
 177 {
 178   const char *errmsg;
 179   enum cgen_parse_operand_result result_type;
 180   bfd_vma value;
 181
 182   if (**strp == '#')
 183     ++*strp;
 184
 185   if (strncasecmp (*strp, "low(", 4) == 0)
 186     {
 187       *strp += 4;
 188       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 189                                    & result_type, & value);
 190       if (**strp != ')')
 191         return MISSING_CLOSING_PARENTHESIS;
 192       ++*strp;
 193       if (errmsg == NULL
 194           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 195         value &= 0xffff;
 196       *valuep = value;
 197       return errmsg;
 198     }
 199
 200   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 201 }
 202
 203 /* -- */
 204
 205 const char * m32r_cgen_parse_operand
 206   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 207
 208 /* Main entry point for operand parsing.
 209
 210    This function is basically just a big switch statement.  Earlier versions
 211    used tables to look up the function to use, but
 212    - if the table contains both assembler and disassembler functions then
 213      the disassembler contains much of the assembler and vice-versa,
 214    - there's a lot of inlining possibilities as things grow,
 215    - using a switch statement avoids the function call overhead.
 216
 217    This function could be moved into `parse_insn_normal', but keeping it
 218    separate makes clear the interface between `parse_insn_normal' and each of
 219    the handlers.  */
 220
 221 const char *
 222 m32r_cgen_parse_operand (CGEN_CPU_DESC cd,
 223                            int opindex,
 224                            const char ** strp,
 225                            CGEN_FIELDS * fields)
 226 {
 227   const char * errmsg = NULL;
 228   /* Used by scalar operands that still need to be parsed.  */
 229   long junk ATTRIBUTE_UNUSED;
 230
 231   switch (opindex)
 232     {
 233     case M32R_OPERAND_ACC :
 234       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_acc);
 235       break;
 236     case M32R_OPERAND_ACCD :
 237       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accd);
 238       break;
 239     case M32R_OPERAND_ACCS :
 240       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accs);
 241       break;
 242     case M32R_OPERAND_DCR :
 243       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r1);
 244       break;
 245     case M32R_OPERAND_DISP16 :
 246       {
 247         bfd_vma value = 0;
 248         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP16, 0, NULL,  & value);
 249         fields->f_disp16 = value;
 250       }
 251       break;
 252     case M32R_OPERAND_DISP24 :
 253       {
 254         bfd_vma value = 0;
 255         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP24, 0, NULL,  & value);
 256         fields->f_disp24 = value;
 257       }
 258       break;
 259     case M32R_OPERAND_DISP8 :
 260       {
 261         bfd_vma value = 0;
 262         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP8, 0, NULL,  & value);
 263         fields->f_disp8 = value;
 264       }
 265       break;
 266     case M32R_OPERAND_DR :
 267       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 268       break;
 269     case M32R_OPERAND_HASH :
 270       errmsg = parse_hash (cd, strp, M32R_OPERAND_HASH, (long *) (& junk));
 271       break;
 272     case M32R_OPERAND_HI16 :
 273       errmsg = parse_hi16 (cd, strp, M32R_OPERAND_HI16, (unsigned long *) (& fields->f_hi16));
 274       break;
 275     case M32R_OPERAND_IMM1 :
 276       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_IMM1, (unsigned long *) (& fields->f_imm1));
 277       break;
 278     case M32R_OPERAND_SCR :
 279       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r2);
 280       break;
 281     case M32R_OPERAND_SIMM16 :
 282       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM16, (long *) (& fields->f_simm16));
 283       break;
 284     case M32R_OPERAND_SIMM8 :
 285       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM8, (long *) (& fields->f_simm8));
 286       break;
 287     case M32R_OPERAND_SLO16 :
 288       errmsg = parse_slo16 (cd, strp, M32R_OPERAND_SLO16, (long *) (& fields->f_simm16));
 289       break;
 290     case M32R_OPERAND_SR :
 291       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 292       break;
 293     case M32R_OPERAND_SRC1 :
 294       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 295       break;
 296     case M32R_OPERAND_SRC2 :
 297       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 298       break;
 299     case M32R_OPERAND_UIMM16 :
 300       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
 301       break;
 302     case M32R_OPERAND_UIMM24 :
 303       {
 304         bfd_vma value = 0;
 305         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_UIMM24, 0, NULL,  & value);
 306         fields->f_uimm24 = value;
 307       }
 308       break;
 309     case M32R_OPERAND_UIMM3 :
 310       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM3, (unsigned long *) (& fields->f_uimm3));
 311       break;
 312     case M32R_OPERAND_UIMM4 :
 313       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
 314       break;
 315     case M32R_OPERAND_UIMM5 :
 316       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM5, (unsigned long *) (& fields->f_uimm5));
 317       break;
 318     case M32R_OPERAND_UIMM8 :
 319       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
 320       break;
 321     case M32R_OPERAND_ULO16 :
 322       errmsg = parse_ulo16 (cd, strp, M32R_OPERAND_ULO16, (unsigned long *) (& fields->f_uimm16));
 323       break;
 324
 325     default :
 326       /* xgettext:c-format */
 327       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 328       abort ();
 329   }
 330
 331   return errmsg;
 332 }
 333
 334 cgen_parse_fn * const m32r_cgen_parse_handlers[] =
 335 {
 336   parse_insn_normal,
 337 };
 338
 339 void
 340 m32r_cgen_init_asm (CGEN_CPU_DESC cd)
 341 {
 342   m32r_cgen_init_opcode_table (cd);
 343   m32r_cgen_init_ibld_table (cd);
 344   cd->parse_handlers = & m32r_cgen_parse_handlers[0];
 345   cd->parse_operand = m32r_cgen_parse_operand;
 346 }
 347
 348 \f
 349
 350 /* Regex construction routine.
 351
 352    This translates an opcode syntax string into a regex string,
 353    by replacing any non-character syntax element (such as an
 354    opcode) with the pattern '.*'
 355
 356    It then compiles the regex and stores it in the opcode, for
 357    later use by m32r_cgen_assemble_insn
 358
 359    Returns NULL for success, an error message for failure.  */
 360
 361 char *
 362 m32r_cgen_build_insn_regex (CGEN_INSN *insn)
 363 {
 364   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 365   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 366   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 367   char *rx = rxbuf;
 368   const CGEN_SYNTAX_CHAR_TYPE *syn;
 369   int reg_err;
 370
 371   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 372
 373   /* Mnemonics come first in the syntax string.  */
 374   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 375     return _("missing mnemonic in syntax string");
 376   ++syn;
 377
 378   /* Generate a case sensitive regular expression that emulates case
 379      insensitive matching in the "C" locale.  We cannot generate a case
 380      insensitive regular expression because in Turkish locales, 'i' and 'I'
 381      are not equal modulo case conversion.  */
 382
 383   /* Copy the literal mnemonic out of the insn.  */
 384   for (; *mnem; mnem++)
 385     {
 386       char c = *mnem;
 387
 388       if (ISALPHA (c))
 389         {
 390           *rx++ = '[';
 391           *rx++ = TOLOWER (c);
 392           *rx++ = TOUPPER (c);
 393           *rx++ = ']';
 394         }
 395       else
 396         *rx++ = c;
 397     }
 398
 399   /* Copy any remaining literals from the syntax string into the rx.  */
 400   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 401     {
 402       if (CGEN_SYNTAX_CHAR_P (* syn))
 403         {
 404           char c = CGEN_SYNTAX_CHAR (* syn);
 405
 406           switch (c)
 407             {
 408               /* Escape any regex metacharacters in the syntax.  */
 409             case '.': case '[': case '\\':
 410             case '*': case '^': case '$':
 411
 412 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 413             case '?': case '{': case '}':
 414             case '(': case ')': case '*':
 415             case '|': case '+': case ']':
 416 #endif
 417               *rx++ = '\\';
 418               *rx++ = c;
 419               break;
 420
 421             default:
 422               if (ISALPHA (c))
 423                 {
 424                   *rx++ = '[';
 425                   *rx++ = TOLOWER (c);
 426                   *rx++ = TOUPPER (c);
 427                   *rx++ = ']';
 428                 }
 429               else
 430                 *rx++ = c;
 431               break;
 432             }
 433         }
 434       else
 435         {
 436           /* Replace non-syntax fields with globs.  */
 437           *rx++ = '.';
 438           *rx++ = '*';
 439         }
 440     }
 441
 442   /* Trailing whitespace ok.  */
 443   * rx++ = '[';
 444   * rx++ = ' ';
 445   * rx++ = '\t';
 446   * rx++ = ']';
 447   * rx++ = '*';
 448
 449   /* But anchor it after that.  */
 450   * rx++ = '$';
 451   * rx = '\0';
 452
 453   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 454   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 455
 456   if (reg_err == 0)
 457     return NULL;
 458   else
 459     {
 460       static char msg[80];
 461
 462       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 463       regfree ((regex_t *) CGEN_INSN_RX (insn));
 464       free (CGEN_INSN_RX (insn));
 465       (CGEN_INSN_RX (insn)) = NULL;
 466       return msg;
 467     }
 468 }
 469
 470 \f
 471 /* Default insn parser.
 472
 473    The syntax string is scanned and operands are parsed and stored in FIELDS.
 474    Relocs are queued as we go via other callbacks.
 475
 476    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 477    parse the instruction, we return 0 and the caller will start over from
 478    the beginning.  Backtracking will be necessary in parsing subexpressions,
 479    but that can be handled there.  Not handling backtracking here may get
 480    expensive in the case of the m68k.  Deal with later.
 481
 482    Returns NULL for success, an error message for failure.  */
 483
 484 static const char *
 485 parse_insn_normal (CGEN_CPU_DESC cd,
 486                    const CGEN_INSN *insn,
 487                    const char **strp,
 488                    CGEN_FIELDS *fields)
 489 {
 490   /* ??? Runtime added insns not handled yet.  */
 491   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 492   const char *str = *strp;
 493   const char *errmsg;
 494   const char *p;
 495   const CGEN_SYNTAX_CHAR_TYPE * syn;
 496 #ifdef CGEN_MNEMONIC_OPERANDS
 497   /* FIXME: wip */
 498   int past_opcode_p;
 499 #endif
 500
 501   /* For now we assume the mnemonic is first (there are no leading operands).
 502      We can parse it without needing to set up operand parsing.
 503      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 504      not be called from GAS.  */
 505   p = CGEN_INSN_MNEMONIC (insn);
 506   while (*p && TOLOWER (*p) == TOLOWER (*str))
 507     ++p, ++str;
 508
 509   if (* p)
 510     return _("unrecognized instruction");
 511
 512 #ifndef CGEN_MNEMONIC_OPERANDS
 513   if (* str && ! ISSPACE (* str))
 514     return _("unrecognized instruction");
 515 #endif
 516
 517   CGEN_INIT_PARSE (cd);
 518   cgen_init_parse_operand (cd);
 519 #ifdef CGEN_MNEMONIC_OPERANDS
 520   past_opcode_p = 0;
 521 #endif
 522
 523   /* We don't check for (*str != '\0') here because we want to parse
 524      any trailing fake arguments in the syntax string.  */
 525   syn = CGEN_SYNTAX_STRING (syntax);
 526
 527   /* Mnemonics come first for now, ensure valid string.  */
 528   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 529     abort ();
 530
 531   ++syn;
 532
 533   while (* syn != 0)
 534     {
 535       /* Non operand chars must match exactly.  */
 536       if (CGEN_SYNTAX_CHAR_P (* syn))
 537         {
 538           /* FIXME: While we allow for non-GAS callers above, we assume the
 539              first char after the mnemonic part is a space.  */
 540           /* FIXME: We also take inappropriate advantage of the fact that
 541              GAS's input scrubber will remove extraneous blanks.  */
 542           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 543             {
 544 #ifdef CGEN_MNEMONIC_OPERANDS
 545               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 546                 past_opcode_p = 1;
 547 #endif
 548               ++ syn;
 549               ++ str;
 550             }
 551           else if (*str)
 552             {
 553               /* Syntax char didn't match.  Can't be this insn.  */
 554               static char msg [80];
 555
 556               /* xgettext:c-format */
 557               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 558                        CGEN_SYNTAX_CHAR(*syn), *str);
 559               return msg;
 560             }
 561           else
 562             {
 563               /* Ran out of input.  */
 564               static char msg [80];
 565
 566               /* xgettext:c-format */
 567               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 568                        CGEN_SYNTAX_CHAR(*syn));
 569               return msg;
 570             }
 571           continue;
 572         }
 573
 574       /* We have an operand of some sort.  */
 575       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 576                                           &str, fields);
 577       if (errmsg)
 578         return errmsg;
 579
 580       /* Done with this operand, continue with next one.  */
 581       ++ syn;
 582     }
 583
 584   /* If we're at the end of the syntax string, we're done.  */
 585   if (* syn == 0)
 586     {
 587       /* FIXME: For the moment we assume a valid `str' can only contain
 588          blanks now.  IE: We needn't try again with a longer version of
 589          the insn and it is assumed that longer versions of insns appear
 590          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 591       while (ISSPACE (* str))
 592         ++ str;
 593
 594       if (* str != '\0')
 595         return _("junk at end of line"); /* FIXME: would like to include `str' */
 596
 597       return NULL;
 598     }
 599
 600   /* We couldn't parse it.  */
 601   return _("unrecognized instruction");
 602 }
 603 \f
 604 /* Main entry point.
 605    This routine is called for each instruction to be assembled.
 606    STR points to the insn to be assembled.
 607    We assume all necessary tables have been initialized.
 608    The assembled instruction, less any fixups, is stored in BUF.
 609    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 610    still needs to be converted to target byte order, otherwise BUF is an array
 611    of bytes in target byte order.
 612    The result is a pointer to the insn's entry in the opcode table,
 613    or NULL if an error occured (an error message will have already been
 614    printed).
 615
 616    Note that when processing (non-alias) macro-insns,
 617    this function recurses.
 618
 619    ??? It's possible to make this cpu-independent.
 620    One would have to deal with a few minor things.
 621    At this point in time doing so would be more of a curiosity than useful
 622    [for example this file isn't _that_ big], but keeping the possibility in
 623    mind helps keep the design clean.  */
 624
 625 const CGEN_INSN *
 626 m32r_cgen_assemble_insn (CGEN_CPU_DESC cd,
 627                            const char *str,
 628                            CGEN_FIELDS *fields,
 629                            CGEN_INSN_BYTES_PTR buf,
 630                            char **errmsg)
 631 {
 632   const char *start;
 633   CGEN_INSN_LIST *ilist;
 634   const char *parse_errmsg = NULL;
 635   const char *insert_errmsg = NULL;
 636   int recognized_mnemonic = 0;
 637
 638   /* Skip leading white space.  */
 639   while (ISSPACE (* str))
 640     ++ str;
 641
 642   /* The instructions are stored in hashed lists.
 643      Get the first in the list.  */
 644   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 645
 646   /* Keep looking until we find a match.  */
 647   start = str;
 648   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 649     {
 650       const CGEN_INSN *insn = ilist->insn;
 651       recognized_mnemonic = 1;
 652
 653 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 654       /* Not usually needed as unsupported opcodes
 655          shouldn't be in the hash lists.  */
 656       /* Is this insn supported by the selected cpu?  */
 657       if (! m32r_cgen_insn_supported (cd, insn))
 658         continue;
 659 #endif
 660       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 661          chosen immediately.  Instead, it is used during assembler/linker
 662          relaxation if possible.  */
 663       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 664         continue;
 665
 666       str = start;
 667
 668       /* Skip this insn if str doesn't look right lexically.  */
 669       if (CGEN_INSN_RX (insn) != NULL &&
 670           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 671         continue;
 672
 673       /* Allow parse/insert handlers to obtain length of insn.  */
 674       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 675
 676       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 677       if (parse_errmsg != NULL)
 678         continue;
 679
 680       /* ??? 0 is passed for `pc'.  */
 681       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 682                                                  (bfd_vma) 0);
 683       if (insert_errmsg != NULL)
 684         continue;
 685
 686       /* It is up to the caller to actually output the insn and any
 687          queued relocs.  */
 688       return insn;
 689     }
 690
 691   {
 692     static char errbuf[150];
 693 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 694     const char *tmp_errmsg;
 695
 696     /* If requesting verbose error messages, use insert_errmsg.
 697        Failing that, use parse_errmsg.  */
 698     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 699                   parse_errmsg ? parse_errmsg :
 700                   recognized_mnemonic ?
 701                   _("unrecognized form of instruction") :
 702                   _("unrecognized instruction"));
 703
 704     if (strlen (start) > 50)
 705       /* xgettext:c-format */
 706       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 707     else
 708       /* xgettext:c-format */
 709       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 710 #else
 711     if (strlen (start) > 50)
 712       /* xgettext:c-format */
 713       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 714     else
 715       /* xgettext:c-format */
 716       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 717 #endif
 718
 719     *errmsg = errbuf;
 720     return NULL;
 721   }
 722 }