toolchain/binutils/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, 2004 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         {
 115           value = value + (value & 0x8000 ? 0x10000 : 0);
 116           value >>= 16;
 117         }
 118       *valuep = value;
 119       return errmsg;
 120     }
 121
 122   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 123 }
 124
 125 /* Handle low() in a signed context.  Also handle sda().
 126    The signedness of the value doesn't matter to low(), but this also
 127    handles the case where low() isn't present.  */
 128
 129 static const char *
 130 parse_slo16 (cd, strp, opindex, valuep)
 131      CGEN_CPU_DESC cd;
 132      const char **strp;
 133      int opindex;
 134      long *valuep;
 135 {
 136   const char *errmsg;
 137   enum cgen_parse_operand_result result_type;
 138   bfd_vma value;
 139
 140   if (**strp == '#')
 141     ++*strp;
 142
 143   if (strncasecmp (*strp, "low(", 4) == 0)
 144     {
 145       *strp += 4;
 146       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 147                                    &result_type, &value);
 148       if (**strp != ')')
 149         return "missing `)'";
 150       ++*strp;
 151       if (errmsg == NULL
 152           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 153         {
 154           value &= 0xffff;
 155           if (value & 0x8000)
 156              value |= 0xffff0000;
 157         }
 158       *valuep = value;
 159       return errmsg;
 160     }
 161
 162   if (strncasecmp (*strp, "sda(", 4) == 0)
 163     {
 164       *strp += 4;
 165       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 166                                    NULL, &value);
 167       if (**strp != ')')
 168         return "missing `)'";
 169       ++*strp;
 170       *valuep = value;
 171       return errmsg;
 172     }
 173
 174   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 175 }
 176
 177 /* Handle low() in an unsigned context.
 178    The signedness of the value doesn't matter to low(), but this also
 179    handles the case where low() isn't present.  */
 180
 181 static const char *
 182 parse_ulo16 (cd, strp, opindex, valuep)
 183      CGEN_CPU_DESC cd;
 184      const char **strp;
 185      int opindex;
 186      unsigned long *valuep;
 187 {
 188   const char *errmsg;
 189   enum cgen_parse_operand_result result_type;
 190   bfd_vma value;
 191
 192   if (**strp == '#')
 193     ++*strp;
 194
 195   if (strncasecmp (*strp, "low(", 4) == 0)
 196     {
 197       *strp += 4;
 198       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 199                                    &result_type, &value);
 200       if (**strp != ')')
 201         return "missing `)'";
 202       ++*strp;
 203       if (errmsg == NULL
 204           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 205         value &= 0xffff;
 206       *valuep = value;
 207       return errmsg;
 208     }
 209
 210   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 211 }
 212
 213 /* -- */
 214
 215 const char * m32r_cgen_parse_operand
 216   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 217
 218 /* Main entry point for operand parsing.
 219
 220    This function is basically just a big switch statement.  Earlier versions
 221    used tables to look up the function to use, but
 222    - if the table contains both assembler and disassembler functions then
 223      the disassembler contains much of the assembler and vice-versa,
 224    - there's a lot of inlining possibilities as things grow,
 225    - using a switch statement avoids the function call overhead.
 226
 227    This function could be moved into `parse_insn_normal', but keeping it
 228    separate makes clear the interface between `parse_insn_normal' and each of
 229    the handlers.  */
 230
 231 const char *
 232 m32r_cgen_parse_operand (cd, opindex, strp, fields)
 233      CGEN_CPU_DESC cd;
 234      int opindex;
 235      const char ** strp;
 236      CGEN_FIELDS * fields;
 237 {
 238   const char * errmsg = NULL;
 239   /* Used by scalar operands that still need to be parsed.  */
 240   long junk ATTRIBUTE_UNUSED;
 241
 242   switch (opindex)
 243     {
 244     case M32R_OPERAND_ACC :
 245       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_acc);
 246       break;
 247     case M32R_OPERAND_ACCD :
 248       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accd);
 249       break;
 250     case M32R_OPERAND_ACCS :
 251       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accs);
 252       break;
 253     case M32R_OPERAND_DCR :
 254       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r1);
 255       break;
 256     case M32R_OPERAND_DISP16 :
 257       {
 258         bfd_vma value;
 259         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP16, 0, NULL,  & value);
 260         fields->f_disp16 = value;
 261       }
 262       break;
 263     case M32R_OPERAND_DISP24 :
 264       {
 265         bfd_vma value;
 266         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP24, 0, NULL,  & value);
 267         fields->f_disp24 = value;
 268       }
 269       break;
 270     case M32R_OPERAND_DISP8 :
 271       {
 272         bfd_vma value;
 273         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP8, 0, NULL,  & value);
 274         fields->f_disp8 = value;
 275       }
 276       break;
 277     case M32R_OPERAND_DR :
 278       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 279       break;
 280     case M32R_OPERAND_HASH :
 281       errmsg = parse_hash (cd, strp, M32R_OPERAND_HASH, &junk);
 282       break;
 283     case M32R_OPERAND_HI16 :
 284       errmsg = parse_hi16 (cd, strp, M32R_OPERAND_HI16, &fields->f_hi16);
 285       break;
 286     case M32R_OPERAND_IMM1 :
 287       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_IMM1, &fields->f_imm1);
 288       break;
 289     case M32R_OPERAND_SCR :
 290       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r2);
 291       break;
 292     case M32R_OPERAND_SIMM16 :
 293       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM16, &fields->f_simm16);
 294       break;
 295     case M32R_OPERAND_SIMM8 :
 296       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM8, &fields->f_simm8);
 297       break;
 298     case M32R_OPERAND_SLO16 :
 299       errmsg = parse_slo16 (cd, strp, M32R_OPERAND_SLO16, &fields->f_simm16);
 300       break;
 301     case M32R_OPERAND_SR :
 302       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 303       break;
 304     case M32R_OPERAND_SRC1 :
 305       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 306       break;
 307     case M32R_OPERAND_SRC2 :
 308       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 309       break;
 310     case M32R_OPERAND_UIMM16 :
 311       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM16, &fields->f_uimm16);
 312       break;
 313     case M32R_OPERAND_UIMM24 :
 314       {
 315         bfd_vma value;
 316         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_UIMM24, 0, NULL,  & value);
 317         fields->f_uimm24 = value;
 318       }
 319       break;
 320     case M32R_OPERAND_UIMM3 :
 321       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM3, &fields->f_uimm3);
 322       break;
 323     case M32R_OPERAND_UIMM4 :
 324       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM4, &fields->f_uimm4);
 325       break;
 326     case M32R_OPERAND_UIMM5 :
 327       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM5, &fields->f_uimm5);
 328       break;
 329     case M32R_OPERAND_UIMM8 :
 330       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM8, &fields->f_uimm8);
 331       break;
 332     case M32R_OPERAND_ULO16 :
 333       errmsg = parse_ulo16 (cd, strp, M32R_OPERAND_ULO16, &fields->f_uimm16);
 334       break;
 335
 336     default :
 337       /* xgettext:c-format */
 338       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 339       abort ();
 340   }
 341
 342   return errmsg;
 343 }
 344
 345 cgen_parse_fn * const m32r_cgen_parse_handlers[] =
 346 {
 347   parse_insn_normal,
 348 };
 349
 350 void
 351 m32r_cgen_init_asm (cd)
 352      CGEN_CPU_DESC cd;
 353 {
 354   m32r_cgen_init_opcode_table (cd);
 355   m32r_cgen_init_ibld_table (cd);
 356   cd->parse_handlers = & m32r_cgen_parse_handlers[0];
 357   cd->parse_operand = m32r_cgen_parse_operand;
 358 }
 359
 360 \f
 361
 362 /* Regex construction routine.
 363
 364    This translates an opcode syntax string into a regex string,
 365    by replacing any non-character syntax element (such as an
 366    opcode) with the pattern '.*'
 367
 368    It then compiles the regex and stores it in the opcode, for
 369    later use by m32r_cgen_assemble_insn
 370
 371    Returns NULL for success, an error message for failure.  */
 372
 373 char *
 374 m32r_cgen_build_insn_regex (CGEN_INSN *insn)
 375 {
 376   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 377   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 378   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 379   char *rx = rxbuf;
 380   const CGEN_SYNTAX_CHAR_TYPE *syn;
 381   int reg_err;
 382
 383   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 384
 385   /* Mnemonics come first in the syntax string.  */
 386   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 387     return _("missing mnemonic in syntax string");
 388   ++syn;
 389
 390   /* Generate a case sensitive regular expression that emulates case
 391      insensitive matching in the "C" locale.  We cannot generate a case
 392      insensitive regular expression because in Turkish locales, 'i' and 'I'
 393      are not equal modulo case conversion.  */
 394
 395   /* Copy the literal mnemonic out of the insn.  */
 396   for (; *mnem; mnem++)
 397     {
 398       char c = *mnem;
 399
 400       if (ISALPHA (c))
 401         {
 402           *rx++ = '[';
 403           *rx++ = TOLOWER (c);
 404           *rx++ = TOUPPER (c);
 405           *rx++ = ']';
 406         }
 407       else
 408         *rx++ = c;
 409     }
 410
 411   /* Copy any remaining literals from the syntax string into the rx.  */
 412   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 413     {
 414       if (CGEN_SYNTAX_CHAR_P (* syn))
 415         {
 416           char c = CGEN_SYNTAX_CHAR (* syn);
 417
 418           switch (c)
 419             {
 420               /* Escape any regex metacharacters in the syntax.  */
 421             case '.': case '[': case '\\':
 422             case '*': case '^': case '$':
 423
 424 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 425             case '?': case '{': case '}':
 426             case '(': case ')': case '*':
 427             case '|': case '+': case ']':
 428 #endif
 429               *rx++ = '\\';
 430               *rx++ = c;
 431               break;
 432
 433             default:
 434               if (ISALPHA (c))
 435                 {
 436                   *rx++ = '[';
 437                   *rx++ = TOLOWER (c);
 438                   *rx++ = TOUPPER (c);
 439                   *rx++ = ']';
 440                 }
 441               else
 442                 *rx++ = c;
 443               break;
 444             }
 445         }
 446       else
 447         {
 448           /* Replace non-syntax fields with globs.  */
 449           *rx++ = '.';
 450           *rx++ = '*';
 451         }
 452     }
 453
 454   /* Trailing whitespace ok.  */
 455   * rx++ = '[';
 456   * rx++ = ' ';
 457   * rx++ = '\t';
 458   * rx++ = ']';
 459   * rx++ = '*';
 460
 461   /* But anchor it after that.  */
 462   * rx++ = '$';
 463   * rx = '\0';
 464
 465   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 466   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 467
 468   if (reg_err == 0)
 469     return NULL;
 470   else
 471     {
 472       static char msg[80];
 473
 474       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 475       regfree ((regex_t *) CGEN_INSN_RX (insn));
 476       free (CGEN_INSN_RX (insn));
 477       (CGEN_INSN_RX (insn)) = NULL;
 478       return msg;
 479     }
 480 }
 481
 482 \f
 483 /* Default insn parser.
 484
 485    The syntax string is scanned and operands are parsed and stored in FIELDS.
 486    Relocs are queued as we go via other callbacks.
 487
 488    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 489    parse the instruction, we return 0 and the caller will start over from
 490    the beginning.  Backtracking will be necessary in parsing subexpressions,
 491    but that can be handled there.  Not handling backtracking here may get
 492    expensive in the case of the m68k.  Deal with later.
 493
 494    Returns NULL for success, an error message for failure.  */
 495
 496 static const char *
 497 parse_insn_normal (CGEN_CPU_DESC cd,
 498                    const CGEN_INSN *insn,
 499                    const char **strp,
 500                    CGEN_FIELDS *fields)
 501 {
 502   /* ??? Runtime added insns not handled yet.  */
 503   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 504   const char *str = *strp;
 505   const char *errmsg;
 506   const char *p;
 507   const CGEN_SYNTAX_CHAR_TYPE * syn;
 508 #ifdef CGEN_MNEMONIC_OPERANDS
 509   /* FIXME: wip */
 510   int past_opcode_p;
 511 #endif
 512
 513   /* For now we assume the mnemonic is first (there are no leading operands).
 514      We can parse it without needing to set up operand parsing.
 515      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 516      not be called from GAS.  */
 517   p = CGEN_INSN_MNEMONIC (insn);
 518   while (*p && TOLOWER (*p) == TOLOWER (*str))
 519     ++p, ++str;
 520
 521   if (* p)
 522     return _("unrecognized instruction");
 523
 524 #ifndef CGEN_MNEMONIC_OPERANDS
 525   if (* str && ! ISSPACE (* str))
 526     return _("unrecognized instruction");
 527 #endif
 528
 529   CGEN_INIT_PARSE (cd);
 530   cgen_init_parse_operand (cd);
 531 #ifdef CGEN_MNEMONIC_OPERANDS
 532   past_opcode_p = 0;
 533 #endif
 534
 535   /* We don't check for (*str != '\0') here because we want to parse
 536      any trailing fake arguments in the syntax string.  */
 537   syn = CGEN_SYNTAX_STRING (syntax);
 538
 539   /* Mnemonics come first for now, ensure valid string.  */
 540   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 541     abort ();
 542
 543   ++syn;
 544
 545   while (* syn != 0)
 546     {
 547       /* Non operand chars must match exactly.  */
 548       if (CGEN_SYNTAX_CHAR_P (* syn))
 549         {
 550           /* FIXME: While we allow for non-GAS callers above, we assume the
 551              first char after the mnemonic part is a space.  */
 552           /* FIXME: We also take inappropriate advantage of the fact that
 553              GAS's input scrubber will remove extraneous blanks.  */
 554           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 555             {
 556 #ifdef CGEN_MNEMONIC_OPERANDS
 557               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 558                 past_opcode_p = 1;
 559 #endif
 560               ++ syn;
 561               ++ str;
 562             }
 563           else if (*str)
 564             {
 565               /* Syntax char didn't match.  Can't be this insn.  */
 566               static char msg [80];
 567
 568               /* xgettext:c-format */
 569               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 570                        CGEN_SYNTAX_CHAR(*syn), *str);
 571               return msg;
 572             }
 573           else
 574             {
 575               /* Ran out of input.  */
 576               static char msg [80];
 577
 578               /* xgettext:c-format */
 579               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 580                        CGEN_SYNTAX_CHAR(*syn));
 581               return msg;
 582             }
 583           continue;
 584         }
 585
 586       /* We have an operand of some sort.  */
 587       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 588                                           &str, fields);
 589       if (errmsg)
 590         return errmsg;
 591
 592       /* Done with this operand, continue with next one.  */
 593       ++ syn;
 594     }
 595
 596   /* If we're at the end of the syntax string, we're done.  */
 597   if (* syn == 0)
 598     {
 599       /* FIXME: For the moment we assume a valid `str' can only contain
 600          blanks now.  IE: We needn't try again with a longer version of
 601          the insn and it is assumed that longer versions of insns appear
 602          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 603       while (ISSPACE (* str))
 604         ++ str;
 605
 606       if (* str != '\0')
 607         return _("junk at end of line"); /* FIXME: would like to include `str' */
 608
 609       return NULL;
 610     }
 611
 612   /* We couldn't parse it.  */
 613   return _("unrecognized instruction");
 614 }
 615 \f
 616 /* Main entry point.
 617    This routine is called for each instruction to be assembled.
 618    STR points to the insn to be assembled.
 619    We assume all necessary tables have been initialized.
 620    The assembled instruction, less any fixups, is stored in BUF.
 621    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 622    still needs to be converted to target byte order, otherwise BUF is an array
 623    of bytes in target byte order.
 624    The result is a pointer to the insn's entry in the opcode table,
 625    or NULL if an error occured (an error message will have already been
 626    printed).
 627
 628    Note that when processing (non-alias) macro-insns,
 629    this function recurses.
 630
 631    ??? It's possible to make this cpu-independent.
 632    One would have to deal with a few minor things.
 633    At this point in time doing so would be more of a curiosity than useful
 634    [for example this file isn't _that_ big], but keeping the possibility in
 635    mind helps keep the design clean.  */
 636
 637 const CGEN_INSN *
 638 m32r_cgen_assemble_insn (CGEN_CPU_DESC cd,
 639                            const char *str,
 640                            CGEN_FIELDS *fields,
 641                            CGEN_INSN_BYTES_PTR buf,
 642                            char **errmsg)
 643 {
 644   const char *start;
 645   CGEN_INSN_LIST *ilist;
 646   const char *parse_errmsg = NULL;
 647   const char *insert_errmsg = NULL;
 648   int recognized_mnemonic = 0;
 649
 650   /* Skip leading white space.  */
 651   while (ISSPACE (* str))
 652     ++ str;
 653
 654   /* The instructions are stored in hashed lists.
 655      Get the first in the list.  */
 656   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 657
 658   /* Keep looking until we find a match.  */
 659   start = str;
 660   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 661     {
 662       const CGEN_INSN *insn = ilist->insn;
 663       recognized_mnemonic = 1;
 664
 665 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 666       /* Not usually needed as unsupported opcodes
 667          shouldn't be in the hash lists.  */
 668       /* Is this insn supported by the selected cpu?  */
 669       if (! m32r_cgen_insn_supported (cd, insn))
 670         continue;
 671 #endif
 672       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 673          chosen immediately.  Instead, it is used during assembler/linker
 674          relaxation if possible.  */
 675       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 676         continue;
 677
 678       str = start;
 679
 680       /* Skip this insn if str doesn't look right lexically.  */
 681       if (CGEN_INSN_RX (insn) != NULL &&
 682           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 683         continue;
 684
 685       /* Allow parse/insert handlers to obtain length of insn.  */
 686       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 687
 688       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 689       if (parse_errmsg != NULL)
 690         continue;
 691
 692       /* ??? 0 is passed for `pc'.  */
 693       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 694                                                  (bfd_vma) 0);
 695       if (insert_errmsg != NULL)
 696         continue;
 697
 698       /* It is up to the caller to actually output the insn and any
 699          queued relocs.  */
 700       return insn;
 701     }
 702
 703   {
 704     static char errbuf[150];
 705 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 706     const char *tmp_errmsg;
 707
 708     /* If requesting verbose error messages, use insert_errmsg.
 709        Failing that, use parse_errmsg.  */
 710     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 711                   parse_errmsg ? parse_errmsg :
 712                   recognized_mnemonic ?
 713                   _("unrecognized form of instruction") :
 714                   _("unrecognized instruction"));
 715
 716     if (strlen (start) > 50)
 717       /* xgettext:c-format */
 718       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 719     else
 720       /* xgettext:c-format */
 721       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 722 #else
 723     if (strlen (start) > 50)
 724       /* xgettext:c-format */
 725       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 726     else
 727       /* xgettext:c-format */
 728       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 729 #endif
 730
 731     *errmsg = errbuf;
 732     return NULL;
 733   }
 734 }
 735 \f
 736 #if 0 /* This calls back to GAS which we can't do without care.  */
 737
 738 /* Record each member of OPVALS in the assembler's symbol table.
 739    This lets GAS parse registers for us.
 740    ??? Interesting idea but not currently used.  */
 741
 742 /* Record each member of OPVALS in the assembler's symbol table.
 743    FIXME: Not currently used.  */
 744
 745 void
 746 m32r_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals)
 747 {
 748   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 749   const CGEN_KEYWORD_ENTRY * ke;
 750
 751   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 752     {
 753 #if 0 /* Unnecessary, should be done in the search routine.  */
 754       if (! m32r_cgen_opval_supported (ke))
 755         continue;
 756 #endif
 757       cgen_asm_record_register (cd, ke->name, ke->value);
 758     }
 759 }
 760
 761 #endif /* 0 */