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      PARAMS ((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 (insn)
 362      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 (cd, insn, strp, fields)
 486      CGEN_CPU_DESC cd;
 487      const CGEN_INSN *insn;
 488      const char **strp;
 489      CGEN_FIELDS *fields;
 490 {
 491   /* ??? Runtime added insns not handled yet.  */
 492   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 493   const char *str = *strp;
 494   const char *errmsg;
 495   const char *p;
 496   const CGEN_SYNTAX_CHAR_TYPE * syn;
 497 #ifdef CGEN_MNEMONIC_OPERANDS
 498   /* FIXME: wip */
 499   int past_opcode_p;
 500 #endif
 501
 502   /* For now we assume the mnemonic is first (there are no leading operands).
 503      We can parse it without needing to set up operand parsing.
 504      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 505      not be called from GAS.  */
 506   p = CGEN_INSN_MNEMONIC (insn);
 507   while (*p && TOLOWER (*p) == TOLOWER (*str))
 508     ++p, ++str;
 509
 510   if (* p)
 511     return _("unrecognized instruction");
 512
 513 #ifndef CGEN_MNEMONIC_OPERANDS
 514   if (* str && ! ISSPACE (* str))
 515     return _("unrecognized instruction");
 516 #endif
 517
 518   CGEN_INIT_PARSE (cd);
 519   cgen_init_parse_operand (cd);
 520 #ifdef CGEN_MNEMONIC_OPERANDS
 521   past_opcode_p = 0;
 522 #endif
 523
 524   /* We don't check for (*str != '\0') here because we want to parse
 525      any trailing fake arguments in the syntax string.  */
 526   syn = CGEN_SYNTAX_STRING (syntax);
 527
 528   /* Mnemonics come first for now, ensure valid string.  */
 529   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 530     abort ();
 531
 532   ++syn;
 533
 534   while (* syn != 0)
 535     {
 536       /* Non operand chars must match exactly.  */
 537       if (CGEN_SYNTAX_CHAR_P (* syn))
 538         {
 539           /* FIXME: While we allow for non-GAS callers above, we assume the
 540              first char after the mnemonic part is a space.  */
 541           /* FIXME: We also take inappropriate advantage of the fact that
 542              GAS's input scrubber will remove extraneous blanks.  */
 543           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 544             {
 545 #ifdef CGEN_MNEMONIC_OPERANDS
 546               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 547                 past_opcode_p = 1;
 548 #endif
 549               ++ syn;
 550               ++ str;
 551             }
 552           else if (*str)
 553             {
 554               /* Syntax char didn't match.  Can't be this insn.  */
 555               static char msg [80];
 556
 557               /* xgettext:c-format */
 558               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 559                        CGEN_SYNTAX_CHAR(*syn), *str);
 560               return msg;
 561             }
 562           else
 563             {
 564               /* Ran out of input.  */
 565               static char msg [80];
 566
 567               /* xgettext:c-format */
 568               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 569                        CGEN_SYNTAX_CHAR(*syn));
 570               return msg;
 571             }
 572           continue;
 573         }
 574
 575       /* We have an operand of some sort.  */
 576       errmsg = m32r_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 577                                           &str, fields);
 578       if (errmsg)
 579         return errmsg;
 580
 581       /* Done with this operand, continue with next one.  */
 582       ++ syn;
 583     }
 584
 585   /* If we're at the end of the syntax string, we're done.  */
 586   if (* syn == 0)
 587     {
 588       /* FIXME: For the moment we assume a valid `str' can only contain
 589          blanks now.  IE: We needn't try again with a longer version of
 590          the insn and it is assumed that longer versions of insns appear
 591          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 592       while (ISSPACE (* str))
 593         ++ str;
 594
 595       if (* str != '\0')
 596         return _("junk at end of line"); /* FIXME: would like to include `str' */
 597
 598       return NULL;
 599     }
 600
 601   /* We couldn't parse it.  */
 602   return _("unrecognized instruction");
 603 }
 604 \f
 605 /* Main entry point.
 606    This routine is called for each instruction to be assembled.
 607    STR points to the insn to be assembled.
 608    We assume all necessary tables have been initialized.
 609    The assembled instruction, less any fixups, is stored in BUF.
 610    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 611    still needs to be converted to target byte order, otherwise BUF is an array
 612    of bytes in target byte order.
 613    The result is a pointer to the insn's entry in the opcode table,
 614    or NULL if an error occured (an error message will have already been
 615    printed).
 616
 617    Note that when processing (non-alias) macro-insns,
 618    this function recurses.
 619
 620    ??? It's possible to make this cpu-independent.
 621    One would have to deal with a few minor things.
 622    At this point in time doing so would be more of a curiosity than useful
 623    [for example this file isn't _that_ big], but keeping the possibility in
 624    mind helps keep the design clean.  */
 625
 626 const CGEN_INSN *
 627 m32r_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 628      CGEN_CPU_DESC cd;
 629      const char *str;
 630      CGEN_FIELDS *fields;
 631      CGEN_INSN_BYTES_PTR buf;
 632      char **errmsg;
 633 {
 634   const char *start;
 635   CGEN_INSN_LIST *ilist;
 636   const char *parse_errmsg = NULL;
 637   const char *insert_errmsg = NULL;
 638   int recognized_mnemonic = 0;
 639
 640   /* Skip leading white space.  */
 641   while (ISSPACE (* str))
 642     ++ str;
 643
 644   /* The instructions are stored in hashed lists.
 645      Get the first in the list.  */
 646   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 647
 648   /* Keep looking until we find a match.  */
 649   start = str;
 650   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 651     {
 652       const CGEN_INSN *insn = ilist->insn;
 653       recognized_mnemonic = 1;
 654
 655 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 656       /* Not usually needed as unsupported opcodes
 657          shouldn't be in the hash lists.  */
 658       /* Is this insn supported by the selected cpu?  */
 659       if (! m32r_cgen_insn_supported (cd, insn))
 660         continue;
 661 #endif
 662       /* If the RELAX attribute is set, this is an insn that shouldn't be
 663          chosen immediately.  Instead, it is used during assembler/linker
 664          relaxation if possible.  */
 665       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
 666         continue;
 667
 668       str = start;
 669
 670       /* Skip this insn if str doesn't look right lexically.  */
 671       if (CGEN_INSN_RX (insn) != NULL &&
 672           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 673         continue;
 674
 675       /* Allow parse/insert handlers to obtain length of insn.  */
 676       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 677
 678       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 679       if (parse_errmsg != NULL)
 680         continue;
 681
 682       /* ??? 0 is passed for `pc'.  */
 683       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 684                                                  (bfd_vma) 0);
 685       if (insert_errmsg != NULL)
 686         continue;
 687
 688       /* It is up to the caller to actually output the insn and any
 689          queued relocs.  */
 690       return insn;
 691     }
 692
 693   {
 694     static char errbuf[150];
 695 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 696     const char *tmp_errmsg;
 697
 698     /* If requesting verbose error messages, use insert_errmsg.
 699        Failing that, use parse_errmsg.  */
 700     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 701                   parse_errmsg ? parse_errmsg :
 702                   recognized_mnemonic ?
 703                   _("unrecognized form of instruction") :
 704                   _("unrecognized instruction"));
 705
 706     if (strlen (start) > 50)
 707       /* xgettext:c-format */
 708       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 709     else
 710       /* xgettext:c-format */
 711       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 712 #else
 713     if (strlen (start) > 50)
 714       /* xgettext:c-format */
 715       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 716     else
 717       /* xgettext:c-format */
 718       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 719 #endif
 720
 721     *errmsg = errbuf;
 722     return NULL;
 723   }
 724 }
 725 \f
 726 #if 0 /* This calls back to GAS which we can't do without care.  */
 727
 728 /* Record each member of OPVALS in the assembler's symbol table.
 729    This lets GAS parse registers for us.
 730    ??? Interesting idea but not currently used.  */
 731
 732 /* Record each member of OPVALS in the assembler's symbol table.
 733    FIXME: Not currently used.  */
 734
 735 void
 736 m32r_cgen_asm_hash_keywords (cd, opvals)
 737      CGEN_CPU_DESC cd;
 738      CGEN_KEYWORD *opvals;
 739 {
 740   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 741   const CGEN_KEYWORD_ENTRY * ke;
 742
 743   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 744     {
 745 #if 0 /* Unnecessary, should be done in the search routine.  */
 746       if (! m32r_cgen_opval_supported (ke))
 747         continue;
 748 #endif
 749       cgen_asm_record_register (cd, ke->name, ke->value);
 750     }
 751 }
 752
 753 #endif /* 0 */