opcodes/m32r-asm.c

   1 /* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
   2 /* Assembler interface for targets using CGEN. -*- C -*-
   3    CGEN: Cpu tools GENerator
   4
   5    THIS FILE IS MACHINE GENERATED WITH CGEN.
   6    - the resultant file is machine generated, cgen-asm.in isn't
   7
   8    Copyright (C) 1996-2019 Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26
  27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  28    Keep that in mind.  */
  29
  30 #include "sysdep.h"
  31 #include <stdio.h>
  32 #include "ansidecl.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "m32r-desc.h"
  36 #include "m32r-opc.h"
  37 #include "opintl.h"
  38 #include "xregex.h"
  39 #include "libiberty.h"
  40 #include "safe-ctype.h"
  41
  42 #undef  min
  43 #define min(a,b) ((a) < (b) ? (a) : (b))
  44 #undef  max
  45 #define max(a,b) ((a) > (b) ? (a) : (b))
  46
  47 static const char * parse_insn_normal
  48   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  49 \f
  50 /* -- assembler routines inserted here.  */
  51
  52 /* -- asm.c */
  53 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
  54
  55 /* Handle '#' prefixes (i.e. skip over them).  */
  56
  57 static const char *
  58 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  59             const char **strp,
  60             int opindex ATTRIBUTE_UNUSED,
  61             long *valuep ATTRIBUTE_UNUSED)
  62 {
  63   if (**strp == '#')
  64     ++*strp;
  65   return NULL;
  66 }
  67
  68 /* Handle shigh(), high().  */
  69
  70 static const char *
  71 parse_hi16 (CGEN_CPU_DESC cd,
  72             const char **strp,
  73             int opindex,
  74             unsigned long *valuep)
  75 {
  76   const char *errmsg;
  77   enum cgen_parse_operand_result result_type;
  78   bfd_vma value;
  79
  80   if (**strp == '#')
  81     ++*strp;
  82
  83   if (strncasecmp (*strp, "high(", 5) == 0)
  84     {
  85       *strp += 5;
  86       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_ULO,
  87                                    & result_type, & value);
  88       if (**strp != ')')
  89         return MISSING_CLOSING_PARENTHESIS;
  90       ++*strp;
  91       if (errmsg == NULL
  92           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
  93         {
  94           value >>= 16;
  95           value &= 0xffff;
  96         }
  97       *valuep = value;
  98       return errmsg;
  99     }
 100   else if (strncasecmp (*strp, "shigh(", 6) == 0)
 101     {
 102       *strp += 6;
 103       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_HI16_SLO,
 104                                    & result_type, & value);
 105       if (**strp != ')')
 106         return MISSING_CLOSING_PARENTHESIS;
 107       ++*strp;
 108       if (errmsg == NULL
 109           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 110         {
 111           value += 0x8000;
 112           value >>= 16;
 113           value &= 0xffff;
 114         }
 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 (CGEN_CPU_DESC cd,
 128              const char ** strp,
 129              int opindex,
 130              long * valuep)
 131 {
 132   const char *errmsg;
 133   enum cgen_parse_operand_result result_type;
 134   bfd_vma value;
 135
 136   if (**strp == '#')
 137     ++*strp;
 138
 139   if (strncasecmp (*strp, "low(", 4) == 0)
 140     {
 141       *strp += 4;
 142       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 143                                    & result_type, & value);
 144       if (**strp != ')')
 145         return MISSING_CLOSING_PARENTHESIS;
 146       ++*strp;
 147       if (errmsg == NULL
 148           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 149         value = ((value & 0xffff) ^ 0x8000) - 0x8000;
 150       *valuep = value;
 151       return errmsg;
 152     }
 153
 154   if (strncasecmp (*strp, "sda(", 4) == 0)
 155     {
 156       *strp += 4;
 157       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_SDA16,
 158                                    NULL, & value);
 159       if (**strp != ')')
 160         return MISSING_CLOSING_PARENTHESIS;
 161       ++*strp;
 162       *valuep = value;
 163       return errmsg;
 164     }
 165
 166   return cgen_parse_signed_integer (cd, strp, opindex, valuep);
 167 }
 168
 169 /* Handle low() in an unsigned context.
 170    The signedness of the value doesn't matter to low(), but this also
 171    handles the case where low() isn't present.  */
 172
 173 static const char *
 174 parse_ulo16 (CGEN_CPU_DESC cd,
 175              const char **strp,
 176              int opindex,
 177              unsigned long *valuep)
 178 {
 179   const char *errmsg;
 180   enum cgen_parse_operand_result result_type;
 181   bfd_vma value;
 182
 183   if (**strp == '#')
 184     ++*strp;
 185
 186   if (strncasecmp (*strp, "low(", 4) == 0)
 187     {
 188       *strp += 4;
 189       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_M32R_LO16,
 190                                    & result_type, & value);
 191       if (**strp != ')')
 192         return MISSING_CLOSING_PARENTHESIS;
 193       ++*strp;
 194       if (errmsg == NULL
 195           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 196         value &= 0xffff;
 197       *valuep = value;
 198       return errmsg;
 199     }
 200
 201   return cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 202 }
 203
 204 /* -- */
 205
 206 const char * m32r_cgen_parse_operand
 207   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 208
 209 /* Main entry point for operand parsing.
 210
 211    This function is basically just a big switch statement.  Earlier versions
 212    used tables to look up the function to use, but
 213    - if the table contains both assembler and disassembler functions then
 214      the disassembler contains much of the assembler and vice-versa,
 215    - there's a lot of inlining possibilities as things grow,
 216    - using a switch statement avoids the function call overhead.
 217
 218    This function could be moved into `parse_insn_normal', but keeping it
 219    separate makes clear the interface between `parse_insn_normal' and each of
 220    the handlers.  */
 221
 222 const char *
 223 m32r_cgen_parse_operand (CGEN_CPU_DESC cd,
 224                            int opindex,
 225                            const char ** strp,
 226                            CGEN_FIELDS * fields)
 227 {
 228   const char * errmsg = NULL;
 229   /* Used by scalar operands that still need to be parsed.  */
 230   long junk ATTRIBUTE_UNUSED;
 231
 232   switch (opindex)
 233     {
 234     case M32R_OPERAND_ACC :
 235       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_acc);
 236       break;
 237     case M32R_OPERAND_ACCD :
 238       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accd);
 239       break;
 240     case M32R_OPERAND_ACCS :
 241       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_h_accums, & fields->f_accs);
 242       break;
 243     case M32R_OPERAND_DCR :
 244       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r1);
 245       break;
 246     case M32R_OPERAND_DISP16 :
 247       {
 248         bfd_vma value = 0;
 249         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP16, 0, NULL,  & value);
 250         fields->f_disp16 = value;
 251       }
 252       break;
 253     case M32R_OPERAND_DISP24 :
 254       {
 255         bfd_vma value = 0;
 256         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP24, 0, NULL,  & value);
 257         fields->f_disp24 = value;
 258       }
 259       break;
 260     case M32R_OPERAND_DISP8 :
 261       {
 262         bfd_vma value = 0;
 263         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_DISP8, 0, NULL,  & value);
 264         fields->f_disp8 = value;
 265       }
 266       break;
 267     case M32R_OPERAND_DR :
 268       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 269       break;
 270     case M32R_OPERAND_HASH :
 271       errmsg = parse_hash (cd, strp, M32R_OPERAND_HASH, (long *) (& junk));
 272       break;
 273     case M32R_OPERAND_HI16 :
 274       errmsg = parse_hi16 (cd, strp, M32R_OPERAND_HI16, (unsigned long *) (& fields->f_hi16));
 275       break;
 276     case M32R_OPERAND_IMM1 :
 277       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_IMM1, (unsigned long *) (& fields->f_imm1));
 278       break;
 279     case M32R_OPERAND_SCR :
 280       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_cr_names, & fields->f_r2);
 281       break;
 282     case M32R_OPERAND_SIMM16 :
 283       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM16, (long *) (& fields->f_simm16));
 284       break;
 285     case M32R_OPERAND_SIMM8 :
 286       errmsg = cgen_parse_signed_integer (cd, strp, M32R_OPERAND_SIMM8, (long *) (& fields->f_simm8));
 287       break;
 288     case M32R_OPERAND_SLO16 :
 289       errmsg = parse_slo16 (cd, strp, M32R_OPERAND_SLO16, (long *) (& fields->f_simm16));
 290       break;
 291     case M32R_OPERAND_SR :
 292       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 293       break;
 294     case M32R_OPERAND_SRC1 :
 295       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r1);
 296       break;
 297     case M32R_OPERAND_SRC2 :
 298       errmsg = cgen_parse_keyword (cd, strp, & m32r_cgen_opval_gr_names, & fields->f_r2);
 299       break;
 300     case M32R_OPERAND_UIMM16 :
 301       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
 302       break;
 303     case M32R_OPERAND_UIMM24 :
 304       {
 305         bfd_vma value = 0;
 306         errmsg = cgen_parse_address (cd, strp, M32R_OPERAND_UIMM24, 0, NULL,  & value);
 307         fields->f_uimm24 = value;
 308       }
 309       break;
 310     case M32R_OPERAND_UIMM3 :
 311       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM3, (unsigned long *) (& fields->f_uimm3));
 312       break;
 313     case M32R_OPERAND_UIMM4 :
 314       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
 315       break;
 316     case M32R_OPERAND_UIMM5 :
 317       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM5, (unsigned long *) (& fields->f_uimm5));
 318       break;
 319     case M32R_OPERAND_UIMM8 :
 320       errmsg = cgen_parse_unsigned_integer (cd, strp, M32R_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
 321       break;
 322     case M32R_OPERAND_ULO16 :
 323       errmsg = parse_ulo16 (cd, strp, M32R_OPERAND_ULO16, (unsigned long *) (& fields->f_uimm16));
 324       break;
 325
 326     default :
 327       /* xgettext:c-format */
 328       opcodes_error_handler
 329         (_("internal error: unrecognized field %d while parsing"),
 330          opindex);
 331       abort ();
 332   }
 333
 334   return errmsg;
 335 }
 336
 337 cgen_parse_fn * const m32r_cgen_parse_handlers[] =
 338 {
 339   parse_insn_normal,
 340 };
 341
 342 void
 343 m32r_cgen_init_asm (CGEN_CPU_DESC cd)
 344 {
 345   m32r_cgen_init_opcode_table (cd);
 346   m32r_cgen_init_ibld_table (cd);
 347   cd->parse_handlers = & m32r_cgen_parse_handlers[0];
 348   cd->parse_operand = m32r_cgen_parse_operand;
 349 #ifdef CGEN_ASM_INIT_HOOK
 350 CGEN_ASM_INIT_HOOK
 351 #endif
 352 }
 353
 354 \f
 355
 356 /* Regex construction routine.
 357
 358    This translates an opcode syntax string into a regex string,
 359    by replacing any non-character syntax element (such as an
 360    opcode) with the pattern '.*'
 361
 362    It then compiles the regex and stores it in the opcode, for
 363    later use by m32r_cgen_assemble_insn
 364
 365    Returns NULL for success, an error message for failure.  */
 366
 367 char *
 368 m32r_cgen_build_insn_regex (CGEN_INSN *insn)
 369 {
 370   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 371   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 372   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 373   char *rx = rxbuf;
 374   const CGEN_SYNTAX_CHAR_TYPE *syn;
 375   int reg_err;
 376
 377   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 378
 379   /* Mnemonics come first in the syntax string.  */
 380   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 381     return _("missing mnemonic in syntax string");
 382   ++syn;
 383
 384   /* Generate a case sensitive regular expression that emulates case
 385      insensitive matching in the "C" locale.  We cannot generate a case
 386      insensitive regular expression because in Turkish locales, 'i' and 'I'
 387      are not equal modulo case conversion.  */
 388
 389   /* Copy the literal mnemonic out of the insn.  */
 390   for (; *mnem; mnem++)
 391     {
 392       char c = *mnem;
 393
 394       if (ISALPHA (c))
 395         {
 396           *rx++ = '[';
 397           *rx++ = TOLOWER (c);
 398           *rx++ = TOUPPER (c);
 399           *rx++ = ']';
 400         }
 401       else
 402         *rx++ = c;
 403     }
 404
 405   /* Copy any remaining literals from the syntax string into the rx.  */
 406   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 407     {
 408       if (CGEN_SYNTAX_CHAR_P (* syn))
 409         {
 410           char c = CGEN_SYNTAX_CHAR (* syn);
 411
 412           switch (c)
 413             {
 414               /* Escape any regex metacharacters in the syntax.  */
 415             case '.': case '[': case '\\':
 416             case '*': case '^': case '$':
 417
 418 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 419             case '?': case '{': case '}':
 420             case '(': case ')': case '*':
 421             case '|': case '+': case ']':
 422 #endif
 423               *rx++ = '\\';
 424               *rx++ = c;
 425               break;
 426
 427             default:
 428               if (ISALPHA (c))
 429                 {
 430                   *rx++ = '[';
 431                   *rx++ = TOLOWER (c);
 432                   *rx++ = TOUPPER (c);
 433                   *rx++ = ']';
 434                 }
 435               else
 436                 *rx++ = c;
 437               break;
 438             }
 439         }
 440       else
 441         {
 442           /* Replace non-syntax fields with globs.  */
 443           *rx++ = '.';
 444           *rx++ = '*';
 445         }
 446     }
 447
 448   /* Trailing whitespace ok.  */
 449   * rx++ = '[';
 450   * rx++ = ' ';
 451   * rx++ = '\t';
 452   * rx++ = ']';
 453   * rx++ = '*';
 454
 455   /* But anchor it after that.  */
 456   * rx++ = '$';
 457   * rx = '\0';
 458
 459   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 460   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 461
 462   if (reg_err == 0)
 463     return NULL;
 464   else
 465     {
 466       static char msg[80];
 467
 468       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 469       regfree ((regex_t *) CGEN_INSN_RX (insn));
 470       free (CGEN_INSN_RX (insn));
 471       (CGEN_INSN_RX (insn)) = NULL;
 472       return msg;
 473     }
 474 }
 475
 476 \f
 477 /* Default insn parser.
 478
 479    The syntax string is scanned and operands are parsed and stored in FIELDS.
 480    Relocs are queued as we go via other callbacks.
 481
 482    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 483    parse the instruction, we return 0 and the caller will start over from
 484    the beginning.  Backtracking will be necessary in parsing subexpressions,
 485    but that can be handled there.  Not handling backtracking here may get
 486    expensive in the case of the m68k.  Deal with later.
 487
 488    Returns NULL for success, an error message for failure.  */
 489
 490 static const char *
 491 parse_insn_normal (CGEN_CPU_DESC cd,
 492                    const CGEN_INSN *insn,
 493                    const char **strp,
 494                    CGEN_FIELDS *fields)
 495 {
 496   /* ??? Runtime added insns not handled yet.  */
 497   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 498   const char *str = *strp;
 499   const char *errmsg;
 500   const char *p;
 501   const CGEN_SYNTAX_CHAR_TYPE * syn;
 502 #ifdef CGEN_MNEMONIC_OPERANDS
 503   /* FIXME: wip */
 504   int past_opcode_p;
 505 #endif
 506
 507   /* For now we assume the mnemonic is first (there are no leading operands).
 508      We can parse it without needing to set up operand parsing.
 509      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 510      not be called from GAS.  */
 511   p = CGEN_INSN_MNEMONIC (insn);
 512   while (*p && TOLOWER (*p) == TOLOWER (*str))
 513     ++p, ++str;
 514
 515   if (* p)
 516     return _("unrecognized instruction");
 517
 518 #ifndef CGEN_MNEMONIC_OPERANDS
 519   if (* str && ! ISSPACE (* str))
 520     return _("unrecognized instruction");
 521 #endif
 522
 523   CGEN_INIT_PARSE (cd);
 524   cgen_init_parse_operand (cd);
 525 #ifdef CGEN_MNEMONIC_OPERANDS
 526   past_opcode_p = 0;
 527 #endif
 528
 529   /* We don't check for (*str != '\0') here because we want to parse
 530      any trailing fake arguments in the syntax string.  */
 531   syn = CGEN_SYNTAX_STRING (syntax);
 532
 533   /* Mnemonics come first for now, ensure valid string.  */
 534   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 535     abort ();
 536
 537   ++syn;
 538
 539   while (* syn != 0)
 540     {
 541       /* Non operand chars must match exactly.  */
 542       if (CGEN_SYNTAX_CHAR_P (* syn))
 543         {
 544           /* FIXME: While we allow for non-GAS callers above, we assume the
 545              first char after the mnemonic part is a space.  */
 546           /* FIXME: We also take inappropriate advantage of the fact that
 547              GAS's input scrubber will remove extraneous blanks.  */
 548           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 549             {
 550 #ifdef CGEN_MNEMONIC_OPERANDS
 551               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 552                 past_opcode_p = 1;
 553 #endif
 554               ++ syn;
 555               ++ str;
 556             }
 557           else if (*str)
 558             {
 559               /* Syntax char didn't match.  Can't be this insn.  */
 560               static char msg [80];
 561
 562               /* xgettext:c-format */
 563               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 564                        CGEN_SYNTAX_CHAR(*syn), *str);
 565               return msg;
 566             }
 567           else
 568             {
 569               /* Ran out of input.  */
 570               static char msg [80];
 571
 572               /* xgettext:c-format */
 573               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 574                        CGEN_SYNTAX_CHAR(*syn));
 575               return msg;
 576             }
 577           continue;
 578         }
 579
 580 #ifdef CGEN_MNEMONIC_OPERANDS
 581       (void) past_opcode_p;
 582 #endif
 583       /* We have an operand of some sort.  */
 584       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 585       if (errmsg)
 586         return errmsg;
 587
 588       /* Done with this operand, continue with next one.  */
 589       ++ syn;
 590     }
 591
 592   /* If we're at the end of the syntax string, we're done.  */
 593   if (* syn == 0)
 594     {
 595       /* FIXME: For the moment we assume a valid `str' can only contain
 596          blanks now.  IE: We needn't try again with a longer version of
 597          the insn and it is assumed that longer versions of insns appear
 598          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 599       while (ISSPACE (* str))
 600         ++ str;
 601
 602       if (* str != '\0')
 603         return _("junk at end of line"); /* FIXME: would like to include `str' */
 604
 605       return NULL;
 606     }
 607
 608   /* We couldn't parse it.  */
 609   return _("unrecognized instruction");
 610 }
 611 \f
 612 /* Main entry point.
 613    This routine is called for each instruction to be assembled.
 614    STR points to the insn to be assembled.
 615    We assume all necessary tables have been initialized.
 616    The assembled instruction, less any fixups, is stored in BUF.
 617    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 618    still needs to be converted to target byte order, otherwise BUF is an array
 619    of bytes in target byte order.
 620    The result is a pointer to the insn's entry in the opcode table,
 621    or NULL if an error occured (an error message will have already been
 622    printed).
 623
 624    Note that when processing (non-alias) macro-insns,
 625    this function recurses.
 626
 627    ??? It's possible to make this cpu-independent.
 628    One would have to deal with a few minor things.
 629    At this point in time doing so would be more of a curiosity than useful
 630    [for example this file isn't _that_ big], but keeping the possibility in
 631    mind helps keep the design clean.  */
 632
 633 const CGEN_INSN *
 634 m32r_cgen_assemble_insn (CGEN_CPU_DESC cd,
 635                            const char *str,
 636                            CGEN_FIELDS *fields,
 637                            CGEN_INSN_BYTES_PTR buf,
 638                            char **errmsg)
 639 {
 640   const char *start;
 641   CGEN_INSN_LIST *ilist;
 642   const char *parse_errmsg = NULL;
 643   const char *insert_errmsg = NULL;
 644   int recognized_mnemonic = 0;
 645
 646   /* Skip leading white space.  */
 647   while (ISSPACE (* str))
 648     ++ str;
 649
 650   /* The instructions are stored in hashed lists.
 651      Get the first in the list.  */
 652   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 653
 654   /* Keep looking until we find a match.  */
 655   start = str;
 656   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 657     {
 658       const CGEN_INSN *insn = ilist->insn;
 659       recognized_mnemonic = 1;
 660
 661 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 662       /* Not usually needed as unsupported opcodes
 663          shouldn't be in the hash lists.  */
 664       /* Is this insn supported by the selected cpu?  */
 665       if (! m32r_cgen_insn_supported (cd, insn))
 666         continue;
 667 #endif
 668       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 669          chosen immediately.  Instead, it is used during assembler/linker
 670          relaxation if possible.  */
 671       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 672         continue;
 673
 674       str = start;
 675
 676       /* Skip this insn if str doesn't look right lexically.  */
 677       if (CGEN_INSN_RX (insn) != NULL &&
 678           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 679         continue;
 680
 681       /* Allow parse/insert handlers to obtain length of insn.  */
 682       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 683
 684       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 685       if (parse_errmsg != NULL)
 686         continue;
 687
 688       /* ??? 0 is passed for `pc'.  */
 689       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 690                                                  (bfd_vma) 0);
 691       if (insert_errmsg != NULL)
 692         continue;
 693
 694       /* It is up to the caller to actually output the insn and any
 695          queued relocs.  */
 696       return insn;
 697     }
 698
 699   {
 700     static char errbuf[150];
 701     const char *tmp_errmsg;
 702 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 703 #define be_verbose 1
 704 #else
 705 #define be_verbose 0
 706 #endif
 707
 708     if (be_verbose)
 709       {
 710         /* If requesting verbose error messages, use insert_errmsg.
 711            Failing that, use parse_errmsg.  */
 712         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 713                       parse_errmsg ? parse_errmsg :
 714                       recognized_mnemonic ?
 715                       _("unrecognized form of instruction") :
 716                       _("unrecognized instruction"));
 717
 718         if (strlen (start) > 50)
 719           /* xgettext:c-format */
 720           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 721         else
 722           /* xgettext:c-format */
 723           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 724       }
 725     else
 726       {
 727         if (strlen (start) > 50)
 728           /* xgettext:c-format */
 729           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 730         else
 731           /* xgettext:c-format */
 732           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 733       }
 734
 735     *errmsg = errbuf;
 736     return NULL;
 737   }
 738 }