opcodes/fr30-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) 1996-2020 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 "fr30-desc.h"
  36 #include "fr30-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 /* Handle register lists for LDMx and STMx.  */
  54
  55 static int
  56 parse_register_number (const char **strp)
  57 {
  58   int regno;
  59
  60   if (**strp < '0' || **strp > '9')
  61     return -1; /* Error.  */
  62   regno = **strp - '0';
  63   ++*strp;
  64
  65   if (**strp >= '0' && **strp <= '9')
  66     {
  67       regno = regno * 10 + (**strp - '0');
  68       ++*strp;
  69     }
  70
  71   return regno;
  72 }
  73
  74 static const char *
  75 parse_register_list (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  76                      const char **strp,
  77                      int opindex ATTRIBUTE_UNUSED,
  78                      unsigned long *valuep,
  79                      int high_low,   /* 0 == high, 1 == low.  */
  80                      int load_store) /* 0 == load, 1 == store.  */
  81 {
  82   *valuep = 0;
  83   while (**strp && **strp != ')')
  84     {
  85       int regno;
  86
  87       if (**strp != 'R' && **strp != 'r')
  88         break;
  89       ++*strp;
  90
  91       regno = parse_register_number (strp);
  92       if (regno == -1)
  93         return _("Register number is not valid");
  94       if (regno > 7 && !high_low)
  95         return _("Register must be between r0 and r7");
  96       if (regno < 8 && high_low)
  97         return _("Register must be between r8 and r15");
  98
  99       if (high_low)
 100         regno -= 8;
 101
 102       if (load_store) /* Mask is reversed for store.  */
 103         *valuep |= 0x80 >> regno;
 104       else
 105         *valuep |= 1 << regno;
 106
 107       if (**strp == ',')
 108         {
 109           if (*(*strp + 1) == ')')
 110             break;
 111           ++*strp;
 112         }
 113     }
 114
 115   if (!*strp || **strp != ')')
 116     return _("Register list is not valid");
 117
 118   return NULL;
 119 }
 120
 121 static const char *
 122 parse_low_register_list_ld (CGEN_CPU_DESC cd,
 123                             const char **strp,
 124                             int opindex,
 125                             unsigned long *valuep)
 126 {
 127   return parse_register_list (cd, strp, opindex, valuep,
 128                               0 /* Low.  */, 0 /* Load.  */);
 129 }
 130
 131 static const char *
 132 parse_hi_register_list_ld (CGEN_CPU_DESC cd,
 133                            const char **strp,
 134                            int opindex,
 135                            unsigned long *valuep)
 136 {
 137   return parse_register_list (cd, strp, opindex, valuep,
 138                               1 /* High.  */, 0 /* Load.  */);
 139 }
 140
 141 static const char *
 142 parse_low_register_list_st (CGEN_CPU_DESC cd,
 143                             const char **strp,
 144                             int opindex,
 145                             unsigned long *valuep)
 146 {
 147   return parse_register_list (cd, strp, opindex, valuep,
 148                               0 /* Low.  */, 1 /* Store.  */);
 149 }
 150
 151 static const char *
 152 parse_hi_register_list_st (CGEN_CPU_DESC cd,
 153                            const char **strp,
 154                            int opindex,
 155                            unsigned long *valuep)
 156 {
 157   return parse_register_list (cd, strp, opindex, valuep,
 158                               1 /* High.  */, 1 /* Store.  */);
 159 }
 160
 161 /* -- */
 162
 163 const char * fr30_cgen_parse_operand
 164   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 165
 166 /* Main entry point for operand parsing.
 167
 168    This function is basically just a big switch statement.  Earlier versions
 169    used tables to look up the function to use, but
 170    - if the table contains both assembler and disassembler functions then
 171      the disassembler contains much of the assembler and vice-versa,
 172    - there's a lot of inlining possibilities as things grow,
 173    - using a switch statement avoids the function call overhead.
 174
 175    This function could be moved into `parse_insn_normal', but keeping it
 176    separate makes clear the interface between `parse_insn_normal' and each of
 177    the handlers.  */
 178
 179 const char *
 180 fr30_cgen_parse_operand (CGEN_CPU_DESC cd,
 181                            int opindex,
 182                            const char ** strp,
 183                            CGEN_FIELDS * fields)
 184 {
 185   const char * errmsg = NULL;
 186   /* Used by scalar operands that still need to be parsed.  */
 187   long junk ATTRIBUTE_UNUSED;
 188
 189   switch (opindex)
 190     {
 191     case FR30_OPERAND_CRI :
 192       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_cr_names, & fields->f_CRi);
 193       break;
 194     case FR30_OPERAND_CRJ :
 195       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_cr_names, & fields->f_CRj);
 196       break;
 197     case FR30_OPERAND_R13 :
 198       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r13, & junk);
 199       break;
 200     case FR30_OPERAND_R14 :
 201       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r14, & junk);
 202       break;
 203     case FR30_OPERAND_R15 :
 204       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r15, & junk);
 205       break;
 206     case FR30_OPERAND_RI :
 207       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Ri);
 208       break;
 209     case FR30_OPERAND_RIC :
 210       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Ric);
 211       break;
 212     case FR30_OPERAND_RJ :
 213       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Rj);
 214       break;
 215     case FR30_OPERAND_RJC :
 216       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Rjc);
 217       break;
 218     case FR30_OPERAND_RS1 :
 219       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_dr_names, & fields->f_Rs1);
 220       break;
 221     case FR30_OPERAND_RS2 :
 222       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_dr_names, & fields->f_Rs2);
 223       break;
 224     case FR30_OPERAND_CC :
 225       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_CC, (unsigned long *) (& fields->f_cc));
 226       break;
 227     case FR30_OPERAND_CCC :
 228       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_CCC, (unsigned long *) (& fields->f_ccc));
 229       break;
 230     case FR30_OPERAND_DIR10 :
 231       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR10, (unsigned long *) (& fields->f_dir10));
 232       break;
 233     case FR30_OPERAND_DIR8 :
 234       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR8, (unsigned long *) (& fields->f_dir8));
 235       break;
 236     case FR30_OPERAND_DIR9 :
 237       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR9, (unsigned long *) (& fields->f_dir9));
 238       break;
 239     case FR30_OPERAND_DISP10 :
 240       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP10, (long *) (& fields->f_disp10));
 241       break;
 242     case FR30_OPERAND_DISP8 :
 243       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP8, (long *) (& fields->f_disp8));
 244       break;
 245     case FR30_OPERAND_DISP9 :
 246       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP9, (long *) (& fields->f_disp9));
 247       break;
 248     case FR30_OPERAND_I20 :
 249       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I20, (unsigned long *) (& fields->f_i20));
 250       break;
 251     case FR30_OPERAND_I32 :
 252       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I32, (unsigned long *) (& fields->f_i32));
 253       break;
 254     case FR30_OPERAND_I8 :
 255       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I8, (unsigned long *) (& fields->f_i8));
 256       break;
 257     case FR30_OPERAND_LABEL12 :
 258       {
 259         bfd_vma value = 0;
 260         errmsg = cgen_parse_address (cd, strp, FR30_OPERAND_LABEL12, 0, NULL,  & value);
 261         fields->f_rel12 = value;
 262       }
 263       break;
 264     case FR30_OPERAND_LABEL9 :
 265       {
 266         bfd_vma value = 0;
 267         errmsg = cgen_parse_address (cd, strp, FR30_OPERAND_LABEL9, 0, NULL,  & value);
 268         fields->f_rel9 = value;
 269       }
 270       break;
 271     case FR30_OPERAND_M4 :
 272       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_M4, (long *) (& fields->f_m4));
 273       break;
 274     case FR30_OPERAND_PS :
 275       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_ps, & junk);
 276       break;
 277     case FR30_OPERAND_REGLIST_HI_LD :
 278       errmsg = parse_hi_register_list_ld (cd, strp, FR30_OPERAND_REGLIST_HI_LD, (unsigned long *) (& fields->f_reglist_hi_ld));
 279       break;
 280     case FR30_OPERAND_REGLIST_HI_ST :
 281       errmsg = parse_hi_register_list_st (cd, strp, FR30_OPERAND_REGLIST_HI_ST, (unsigned long *) (& fields->f_reglist_hi_st));
 282       break;
 283     case FR30_OPERAND_REGLIST_LOW_LD :
 284       errmsg = parse_low_register_list_ld (cd, strp, FR30_OPERAND_REGLIST_LOW_LD, (unsigned long *) (& fields->f_reglist_low_ld));
 285       break;
 286     case FR30_OPERAND_REGLIST_LOW_ST :
 287       errmsg = parse_low_register_list_st (cd, strp, FR30_OPERAND_REGLIST_LOW_ST, (unsigned long *) (& fields->f_reglist_low_st));
 288       break;
 289     case FR30_OPERAND_S10 :
 290       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_S10, (long *) (& fields->f_s10));
 291       break;
 292     case FR30_OPERAND_U10 :
 293       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U10, (unsigned long *) (& fields->f_u10));
 294       break;
 295     case FR30_OPERAND_U4 :
 296       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U4, (unsigned long *) (& fields->f_u4));
 297       break;
 298     case FR30_OPERAND_U4C :
 299       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U4C, (unsigned long *) (& fields->f_u4c));
 300       break;
 301     case FR30_OPERAND_U8 :
 302       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U8, (unsigned long *) (& fields->f_u8));
 303       break;
 304     case FR30_OPERAND_UDISP6 :
 305       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_UDISP6, (unsigned long *) (& fields->f_udisp6));
 306       break;
 307
 308     default :
 309       /* xgettext:c-format */
 310       opcodes_error_handler
 311         (_("internal error: unrecognized field %d while parsing"),
 312          opindex);
 313       abort ();
 314   }
 315
 316   return errmsg;
 317 }
 318
 319 cgen_parse_fn * const fr30_cgen_parse_handlers[] =
 320 {
 321   parse_insn_normal,
 322 };
 323
 324 void
 325 fr30_cgen_init_asm (CGEN_CPU_DESC cd)
 326 {
 327   fr30_cgen_init_opcode_table (cd);
 328   fr30_cgen_init_ibld_table (cd);
 329   cd->parse_handlers = & fr30_cgen_parse_handlers[0];
 330   cd->parse_operand = fr30_cgen_parse_operand;
 331 #ifdef CGEN_ASM_INIT_HOOK
 332 CGEN_ASM_INIT_HOOK
 333 #endif
 334 }
 335
 336 \f
 337
 338 /* Regex construction routine.
 339
 340    This translates an opcode syntax string into a regex string,
 341    by replacing any non-character syntax element (such as an
 342    opcode) with the pattern '.*'
 343
 344    It then compiles the regex and stores it in the opcode, for
 345    later use by fr30_cgen_assemble_insn
 346
 347    Returns NULL for success, an error message for failure.  */
 348
 349 char *
 350 fr30_cgen_build_insn_regex (CGEN_INSN *insn)
 351 {
 352   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 353   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 354   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 355   char *rx = rxbuf;
 356   const CGEN_SYNTAX_CHAR_TYPE *syn;
 357   int reg_err;
 358
 359   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 360
 361   /* Mnemonics come first in the syntax string.  */
 362   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 363     return _("missing mnemonic in syntax string");
 364   ++syn;
 365
 366   /* Generate a case sensitive regular expression that emulates case
 367      insensitive matching in the "C" locale.  We cannot generate a case
 368      insensitive regular expression because in Turkish locales, 'i' and 'I'
 369      are not equal modulo case conversion.  */
 370
 371   /* Copy the literal mnemonic out of the insn.  */
 372   for (; *mnem; mnem++)
 373     {
 374       char c = *mnem;
 375
 376       if (ISALPHA (c))
 377         {
 378           *rx++ = '[';
 379           *rx++ = TOLOWER (c);
 380           *rx++ = TOUPPER (c);
 381           *rx++ = ']';
 382         }
 383       else
 384         *rx++ = c;
 385     }
 386
 387   /* Copy any remaining literals from the syntax string into the rx.  */
 388   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 389     {
 390       if (CGEN_SYNTAX_CHAR_P (* syn))
 391         {
 392           char c = CGEN_SYNTAX_CHAR (* syn);
 393
 394           switch (c)
 395             {
 396               /* Escape any regex metacharacters in the syntax.  */
 397             case '.': case '[': case '\\':
 398             case '*': case '^': case '$':
 399
 400 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 401             case '?': case '{': case '}':
 402             case '(': case ')': case '*':
 403             case '|': case '+': case ']':
 404 #endif
 405               *rx++ = '\\';
 406               *rx++ = c;
 407               break;
 408
 409             default:
 410               if (ISALPHA (c))
 411                 {
 412                   *rx++ = '[';
 413                   *rx++ = TOLOWER (c);
 414                   *rx++ = TOUPPER (c);
 415                   *rx++ = ']';
 416                 }
 417               else
 418                 *rx++ = c;
 419               break;
 420             }
 421         }
 422       else
 423         {
 424           /* Replace non-syntax fields with globs.  */
 425           *rx++ = '.';
 426           *rx++ = '*';
 427         }
 428     }
 429
 430   /* Trailing whitespace ok.  */
 431   * rx++ = '[';
 432   * rx++ = ' ';
 433   * rx++ = '\t';
 434   * rx++ = ']';
 435   * rx++ = '*';
 436
 437   /* But anchor it after that.  */
 438   * rx++ = '$';
 439   * rx = '\0';
 440
 441   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 442   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 443
 444   if (reg_err == 0)
 445     return NULL;
 446   else
 447     {
 448       static char msg[80];
 449
 450       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 451       regfree ((regex_t *) CGEN_INSN_RX (insn));
 452       free (CGEN_INSN_RX (insn));
 453       (CGEN_INSN_RX (insn)) = NULL;
 454       return msg;
 455     }
 456 }
 457
 458 \f
 459 /* Default insn parser.
 460
 461    The syntax string is scanned and operands are parsed and stored in FIELDS.
 462    Relocs are queued as we go via other callbacks.
 463
 464    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 465    parse the instruction, we return 0 and the caller will start over from
 466    the beginning.  Backtracking will be necessary in parsing subexpressions,
 467    but that can be handled there.  Not handling backtracking here may get
 468    expensive in the case of the m68k.  Deal with later.
 469
 470    Returns NULL for success, an error message for failure.  */
 471
 472 static const char *
 473 parse_insn_normal (CGEN_CPU_DESC cd,
 474                    const CGEN_INSN *insn,
 475                    const char **strp,
 476                    CGEN_FIELDS *fields)
 477 {
 478   /* ??? Runtime added insns not handled yet.  */
 479   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 480   const char *str = *strp;
 481   const char *errmsg;
 482   const char *p;
 483   const CGEN_SYNTAX_CHAR_TYPE * syn;
 484 #ifdef CGEN_MNEMONIC_OPERANDS
 485   /* FIXME: wip */
 486   int past_opcode_p;
 487 #endif
 488
 489   /* For now we assume the mnemonic is first (there are no leading operands).
 490      We can parse it without needing to set up operand parsing.
 491      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 492      not be called from GAS.  */
 493   p = CGEN_INSN_MNEMONIC (insn);
 494   while (*p && TOLOWER (*p) == TOLOWER (*str))
 495     ++p, ++str;
 496
 497   if (* p)
 498     return _("unrecognized instruction");
 499
 500 #ifndef CGEN_MNEMONIC_OPERANDS
 501   if (* str && ! ISSPACE (* str))
 502     return _("unrecognized instruction");
 503 #endif
 504
 505   CGEN_INIT_PARSE (cd);
 506   cgen_init_parse_operand (cd);
 507 #ifdef CGEN_MNEMONIC_OPERANDS
 508   past_opcode_p = 0;
 509 #endif
 510
 511   /* We don't check for (*str != '\0') here because we want to parse
 512      any trailing fake arguments in the syntax string.  */
 513   syn = CGEN_SYNTAX_STRING (syntax);
 514
 515   /* Mnemonics come first for now, ensure valid string.  */
 516   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 517     abort ();
 518
 519   ++syn;
 520
 521   while (* syn != 0)
 522     {
 523       /* Non operand chars must match exactly.  */
 524       if (CGEN_SYNTAX_CHAR_P (* syn))
 525         {
 526           /* FIXME: While we allow for non-GAS callers above, we assume the
 527              first char after the mnemonic part is a space.  */
 528           /* FIXME: We also take inappropriate advantage of the fact that
 529              GAS's input scrubber will remove extraneous blanks.  */
 530           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 531             {
 532 #ifdef CGEN_MNEMONIC_OPERANDS
 533               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 534                 past_opcode_p = 1;
 535 #endif
 536               ++ syn;
 537               ++ str;
 538             }
 539           else if (*str)
 540             {
 541               /* Syntax char didn't match.  Can't be this insn.  */
 542               static char msg [80];
 543
 544               /* xgettext:c-format */
 545               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 546                        CGEN_SYNTAX_CHAR(*syn), *str);
 547               return msg;
 548             }
 549           else
 550             {
 551               /* Ran out of input.  */
 552               static char msg [80];
 553
 554               /* xgettext:c-format */
 555               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 556                        CGEN_SYNTAX_CHAR(*syn));
 557               return msg;
 558             }
 559           continue;
 560         }
 561
 562 #ifdef CGEN_MNEMONIC_OPERANDS
 563       (void) past_opcode_p;
 564 #endif
 565       /* We have an operand of some sort.  */
 566       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 567       if (errmsg)
 568         return errmsg;
 569
 570       /* Done with this operand, continue with next one.  */
 571       ++ syn;
 572     }
 573
 574   /* If we're at the end of the syntax string, we're done.  */
 575   if (* syn == 0)
 576     {
 577       /* FIXME: For the moment we assume a valid `str' can only contain
 578          blanks now.  IE: We needn't try again with a longer version of
 579          the insn and it is assumed that longer versions of insns appear
 580          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 581       while (ISSPACE (* str))
 582         ++ str;
 583
 584       if (* str != '\0')
 585         return _("junk at end of line"); /* FIXME: would like to include `str' */
 586
 587       return NULL;
 588     }
 589
 590   /* We couldn't parse it.  */
 591   return _("unrecognized instruction");
 592 }
 593 \f
 594 /* Main entry point.
 595    This routine is called for each instruction to be assembled.
 596    STR points to the insn to be assembled.
 597    We assume all necessary tables have been initialized.
 598    The assembled instruction, less any fixups, is stored in BUF.
 599    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 600    still needs to be converted to target byte order, otherwise BUF is an array
 601    of bytes in target byte order.
 602    The result is a pointer to the insn's entry in the opcode table,
 603    or NULL if an error occured (an error message will have already been
 604    printed).
 605
 606    Note that when processing (non-alias) macro-insns,
 607    this function recurses.
 608
 609    ??? It's possible to make this cpu-independent.
 610    One would have to deal with a few minor things.
 611    At this point in time doing so would be more of a curiosity than useful
 612    [for example this file isn't _that_ big], but keeping the possibility in
 613    mind helps keep the design clean.  */
 614
 615 const CGEN_INSN *
 616 fr30_cgen_assemble_insn (CGEN_CPU_DESC cd,
 617                            const char *str,
 618                            CGEN_FIELDS *fields,
 619                            CGEN_INSN_BYTES_PTR buf,
 620                            char **errmsg)
 621 {
 622   const char *start;
 623   CGEN_INSN_LIST *ilist;
 624   const char *parse_errmsg = NULL;
 625   const char *insert_errmsg = NULL;
 626   int recognized_mnemonic = 0;
 627
 628   /* Skip leading white space.  */
 629   while (ISSPACE (* str))
 630     ++ str;
 631
 632   /* The instructions are stored in hashed lists.
 633      Get the first in the list.  */
 634   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 635
 636   /* Keep looking until we find a match.  */
 637   start = str;
 638   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 639     {
 640       const CGEN_INSN *insn = ilist->insn;
 641       recognized_mnemonic = 1;
 642
 643 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 644       /* Not usually needed as unsupported opcodes
 645          shouldn't be in the hash lists.  */
 646       /* Is this insn supported by the selected cpu?  */
 647       if (! fr30_cgen_insn_supported (cd, insn))
 648         continue;
 649 #endif
 650       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 651          chosen immediately.  Instead, it is used during assembler/linker
 652          relaxation if possible.  */
 653       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 654         continue;
 655
 656       str = start;
 657
 658       /* Skip this insn if str doesn't look right lexically.  */
 659       if (CGEN_INSN_RX (insn) != NULL &&
 660           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 661         continue;
 662
 663       /* Allow parse/insert handlers to obtain length of insn.  */
 664       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 665
 666       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 667       if (parse_errmsg != NULL)
 668         continue;
 669
 670       /* ??? 0 is passed for `pc'.  */
 671       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 672                                                  (bfd_vma) 0);
 673       if (insert_errmsg != NULL)
 674         continue;
 675
 676       /* It is up to the caller to actually output the insn and any
 677          queued relocs.  */
 678       return insn;
 679     }
 680
 681   {
 682     static char errbuf[150];
 683     const char *tmp_errmsg;
 684 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 685 #define be_verbose 1
 686 #else
 687 #define be_verbose 0
 688 #endif
 689
 690     if (be_verbose)
 691       {
 692         /* If requesting verbose error messages, use insert_errmsg.
 693            Failing that, use parse_errmsg.  */
 694         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 695                       parse_errmsg ? parse_errmsg :
 696                       recognized_mnemonic ?
 697                       _("unrecognized form of instruction") :
 698                       _("unrecognized instruction"));
 699
 700         if (strlen (start) > 50)
 701           /* xgettext:c-format */
 702           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 703         else
 704           /* xgettext:c-format */
 705           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 706       }
 707     else
 708       {
 709         if (strlen (start) > 50)
 710           /* xgettext:c-format */
 711           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 712         else
 713           /* xgettext:c-format */
 714           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 715       }
 716
 717     *errmsg = errbuf;
 718     return NULL;
 719   }
 720 }