opcodes/fr30-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 "fr30-desc.h"
  34 #include "fr30-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 /* Handle register lists for LDMx and STMx.  */
  52
  53 static int parse_register_number
  54   PARAMS ((const char **));
  55 static const char * parse_register_list
  56   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *, int, int));
  57 static const char * parse_low_register_list_ld
  58   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  59 static const char * parse_hi_register_list_ld
  60   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  61 static const char * parse_low_register_list_st
  62   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  63 static const char * parse_hi_register_list_st
  64   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  65
  66 static int
  67 parse_register_number (strp)
  68      const char **strp;
  69 {
  70   int regno;
  71   if (**strp < '0' || **strp > '9')
  72     return -1; /* error.  */
  73   regno = **strp - '0';
  74   ++*strp;
  75
  76   if (**strp >= '0' && **strp <= '9')
  77     {
  78       regno = regno * 10 + (**strp - '0');
  79       ++*strp;
  80     }
  81
  82   return regno;
  83 }
  84
  85 static const char *
  86 parse_register_list (cd, strp, opindex, valuep, high_low, load_store)
  87      CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
  88      const char **strp;
  89      int opindex ATTRIBUTE_UNUSED;
  90      unsigned long *valuep;
  91      int high_low;   /* 0 == high, 1 == low */
  92      int load_store; /* 0 == load, 1 == store */
  93 {
  94   int regno;
  95
  96   *valuep = 0;
  97   while (**strp && **strp != ')')
  98     {
  99       if (**strp != 'R' && **strp != 'r')
 100         break;
 101       ++*strp;
 102
 103       regno = parse_register_number (strp);
 104       if (regno == -1)
 105         return "Register number is not valid";
 106       if (regno > 7 && !high_low)
 107         return "Register must be between r0 and r7";
 108       if (regno < 8 && high_low)
 109         return "Register must be between r8 and r15";
 110
 111       if (high_low)
 112         regno -= 8;
 113
 114       if (load_store) /* Mask is reversed for store.  */
 115         *valuep |= 0x80 >> regno;
 116       else
 117         *valuep |= 1 << regno;
 118
 119       if (**strp == ',')
 120         {
 121           if (*(*strp + 1) == ')')
 122             break;
 123           ++*strp;
 124         }
 125     }
 126
 127   if (!*strp || **strp != ')')
 128     return "Register list is not valid";
 129
 130   return NULL;
 131 }
 132
 133 static const char *
 134 parse_low_register_list_ld (cd, strp, opindex, valuep)
 135      CGEN_CPU_DESC cd;
 136      const char **strp;
 137      int opindex;
 138      unsigned long *valuep;
 139 {
 140   return parse_register_list (cd, strp, opindex, valuep, 0/*low*/, 0/*load*/);
 141 }
 142
 143 static const char *
 144 parse_hi_register_list_ld (cd, strp, opindex, valuep)
 145      CGEN_CPU_DESC cd;
 146      const char **strp;
 147      int opindex;
 148      unsigned long *valuep;
 149 {
 150   return parse_register_list (cd, strp, opindex, valuep, 1/*high*/, 0/*load*/);
 151 }
 152
 153 static const char *
 154 parse_low_register_list_st (cd, strp, opindex, valuep)
 155      CGEN_CPU_DESC cd;
 156      const char **strp;
 157      int opindex;
 158      unsigned long *valuep;
 159 {
 160   return parse_register_list (cd, strp, opindex, valuep, 0/*low*/, 1/*store*/);
 161 }
 162
 163 static const char *
 164 parse_hi_register_list_st (cd, strp, opindex, valuep)
 165      CGEN_CPU_DESC cd;
 166      const char **strp;
 167      int opindex;
 168      unsigned long *valuep;
 169 {
 170   return parse_register_list (cd, strp, opindex, valuep, 1/*high*/, 1/*store*/);
 171 }
 172
 173 /* -- */
 174
 175 const char * fr30_cgen_parse_operand
 176   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 177
 178 /* Main entry point for operand parsing.
 179
 180    This function is basically just a big switch statement.  Earlier versions
 181    used tables to look up the function to use, but
 182    - if the table contains both assembler and disassembler functions then
 183      the disassembler contains much of the assembler and vice-versa,
 184    - there's a lot of inlining possibilities as things grow,
 185    - using a switch statement avoids the function call overhead.
 186
 187    This function could be moved into `parse_insn_normal', but keeping it
 188    separate makes clear the interface between `parse_insn_normal' and each of
 189    the handlers.  */
 190
 191 const char *
 192 fr30_cgen_parse_operand (cd, opindex, strp, fields)
 193      CGEN_CPU_DESC cd;
 194      int opindex;
 195      const char ** strp;
 196      CGEN_FIELDS * fields;
 197 {
 198   const char * errmsg = NULL;
 199   /* Used by scalar operands that still need to be parsed.  */
 200   long junk ATTRIBUTE_UNUSED;
 201
 202   switch (opindex)
 203     {
 204     case FR30_OPERAND_CRI :
 205       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_cr_names, & fields->f_CRi);
 206       break;
 207     case FR30_OPERAND_CRJ :
 208       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_cr_names, & fields->f_CRj);
 209       break;
 210     case FR30_OPERAND_R13 :
 211       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r13, & junk);
 212       break;
 213     case FR30_OPERAND_R14 :
 214       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r14, & junk);
 215       break;
 216     case FR30_OPERAND_R15 :
 217       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_r15, & junk);
 218       break;
 219     case FR30_OPERAND_RI :
 220       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Ri);
 221       break;
 222     case FR30_OPERAND_RIC :
 223       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Ric);
 224       break;
 225     case FR30_OPERAND_RJ :
 226       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Rj);
 227       break;
 228     case FR30_OPERAND_RJC :
 229       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_gr_names, & fields->f_Rjc);
 230       break;
 231     case FR30_OPERAND_RS1 :
 232       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_dr_names, & fields->f_Rs1);
 233       break;
 234     case FR30_OPERAND_RS2 :
 235       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_dr_names, & fields->f_Rs2);
 236       break;
 237     case FR30_OPERAND_CC :
 238       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_CC, &fields->f_cc);
 239       break;
 240     case FR30_OPERAND_CCC :
 241       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_CCC, &fields->f_ccc);
 242       break;
 243     case FR30_OPERAND_DIR10 :
 244       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR10, &fields->f_dir10);
 245       break;
 246     case FR30_OPERAND_DIR8 :
 247       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR8, &fields->f_dir8);
 248       break;
 249     case FR30_OPERAND_DIR9 :
 250       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_DIR9, &fields->f_dir9);
 251       break;
 252     case FR30_OPERAND_DISP10 :
 253       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP10, &fields->f_disp10);
 254       break;
 255     case FR30_OPERAND_DISP8 :
 256       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP8, &fields->f_disp8);
 257       break;
 258     case FR30_OPERAND_DISP9 :
 259       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_DISP9, &fields->f_disp9);
 260       break;
 261     case FR30_OPERAND_I20 :
 262       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I20, &fields->f_i20);
 263       break;
 264     case FR30_OPERAND_I32 :
 265       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I32, &fields->f_i32);
 266       break;
 267     case FR30_OPERAND_I8 :
 268       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_I8, &fields->f_i8);
 269       break;
 270     case FR30_OPERAND_LABEL12 :
 271       {
 272         bfd_vma value;
 273         errmsg = cgen_parse_address (cd, strp, FR30_OPERAND_LABEL12, 0, NULL,  & value);
 274         fields->f_rel12 = value;
 275       }
 276       break;
 277     case FR30_OPERAND_LABEL9 :
 278       {
 279         bfd_vma value;
 280         errmsg = cgen_parse_address (cd, strp, FR30_OPERAND_LABEL9, 0, NULL,  & value);
 281         fields->f_rel9 = value;
 282       }
 283       break;
 284     case FR30_OPERAND_M4 :
 285       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_M4, &fields->f_m4);
 286       break;
 287     case FR30_OPERAND_PS :
 288       errmsg = cgen_parse_keyword (cd, strp, & fr30_cgen_opval_h_ps, & junk);
 289       break;
 290     case FR30_OPERAND_REGLIST_HI_LD :
 291       errmsg = parse_hi_register_list_ld (cd, strp, FR30_OPERAND_REGLIST_HI_LD, &fields->f_reglist_hi_ld);
 292       break;
 293     case FR30_OPERAND_REGLIST_HI_ST :
 294       errmsg = parse_hi_register_list_st (cd, strp, FR30_OPERAND_REGLIST_HI_ST, &fields->f_reglist_hi_st);
 295       break;
 296     case FR30_OPERAND_REGLIST_LOW_LD :
 297       errmsg = parse_low_register_list_ld (cd, strp, FR30_OPERAND_REGLIST_LOW_LD, &fields->f_reglist_low_ld);
 298       break;
 299     case FR30_OPERAND_REGLIST_LOW_ST :
 300       errmsg = parse_low_register_list_st (cd, strp, FR30_OPERAND_REGLIST_LOW_ST, &fields->f_reglist_low_st);
 301       break;
 302     case FR30_OPERAND_S10 :
 303       errmsg = cgen_parse_signed_integer (cd, strp, FR30_OPERAND_S10, &fields->f_s10);
 304       break;
 305     case FR30_OPERAND_U10 :
 306       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U10, &fields->f_u10);
 307       break;
 308     case FR30_OPERAND_U4 :
 309       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U4, &fields->f_u4);
 310       break;
 311     case FR30_OPERAND_U4C :
 312       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U4C, &fields->f_u4c);
 313       break;
 314     case FR30_OPERAND_U8 :
 315       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_U8, &fields->f_u8);
 316       break;
 317     case FR30_OPERAND_UDISP6 :
 318       errmsg = cgen_parse_unsigned_integer (cd, strp, FR30_OPERAND_UDISP6, &fields->f_udisp6);
 319       break;
 320
 321     default :
 322       /* xgettext:c-format */
 323       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 324       abort ();
 325   }
 326
 327   return errmsg;
 328 }
 329
 330 cgen_parse_fn * const fr30_cgen_parse_handlers[] =
 331 {
 332   parse_insn_normal,
 333 };
 334
 335 void
 336 fr30_cgen_init_asm (cd)
 337      CGEN_CPU_DESC cd;
 338 {
 339   fr30_cgen_init_opcode_table (cd);
 340   fr30_cgen_init_ibld_table (cd);
 341   cd->parse_handlers = & fr30_cgen_parse_handlers[0];
 342   cd->parse_operand = fr30_cgen_parse_operand;
 343 }
 344
 345 \f
 346
 347 /* Regex construction routine.
 348
 349    This translates an opcode syntax string into a regex string,
 350    by replacing any non-character syntax element (such as an
 351    opcode) with the pattern '.*'
 352
 353    It then compiles the regex and stores it in the opcode, for
 354    later use by fr30_cgen_assemble_insn
 355
 356    Returns NULL for success, an error message for failure.  */
 357
 358 char *
 359 fr30_cgen_build_insn_regex (insn)
 360      CGEN_INSN *insn;
 361 {
 362   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 363   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 364   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 365   char *rx = rxbuf;
 366   const CGEN_SYNTAX_CHAR_TYPE *syn;
 367   int reg_err;
 368
 369   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 370
 371   /* Mnemonics come first in the syntax string.  */
 372   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 373     return _("missing mnemonic in syntax string");
 374   ++syn;
 375
 376   /* Generate a case sensitive regular expression that emulates case
 377      insensitive matching in the "C" locale.  We cannot generate a case
 378      insensitive regular expression because in Turkish locales, 'i' and 'I'
 379      are not equal modulo case conversion.  */
 380
 381   /* Copy the literal mnemonic out of the insn.  */
 382   for (; *mnem; mnem++)
 383     {
 384       char c = *mnem;
 385
 386       if (ISALPHA (c))
 387         {
 388           *rx++ = '[';
 389           *rx++ = TOLOWER (c);
 390           *rx++ = TOUPPER (c);
 391           *rx++ = ']';
 392         }
 393       else
 394         *rx++ = c;
 395     }
 396
 397   /* Copy any remaining literals from the syntax string into the rx.  */
 398   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 399     {
 400       if (CGEN_SYNTAX_CHAR_P (* syn))
 401         {
 402           char c = CGEN_SYNTAX_CHAR (* syn);
 403
 404           switch (c)
 405             {
 406               /* Escape any regex metacharacters in the syntax.  */
 407             case '.': case '[': case '\\':
 408             case '*': case '^': case '$':
 409
 410 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 411             case '?': case '{': case '}':
 412             case '(': case ')': case '*':
 413             case '|': case '+': case ']':
 414 #endif
 415               *rx++ = '\\';
 416               *rx++ = c;
 417               break;
 418
 419             default:
 420               if (ISALPHA (c))
 421                 {
 422                   *rx++ = '[';
 423                   *rx++ = TOLOWER (c);
 424                   *rx++ = TOUPPER (c);
 425                   *rx++ = ']';
 426                 }
 427               else
 428                 *rx++ = c;
 429               break;
 430             }
 431         }
 432       else
 433         {
 434           /* Replace non-syntax fields with globs.  */
 435           *rx++ = '.';
 436           *rx++ = '*';
 437         }
 438     }
 439
 440   /* Trailing whitespace ok.  */
 441   * rx++ = '[';
 442   * rx++ = ' ';
 443   * rx++ = '\t';
 444   * rx++ = ']';
 445   * rx++ = '*';
 446
 447   /* But anchor it after that.  */
 448   * rx++ = '$';
 449   * rx = '\0';
 450
 451   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 452   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 453
 454   if (reg_err == 0)
 455     return NULL;
 456   else
 457     {
 458       static char msg[80];
 459
 460       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 461       regfree ((regex_t *) CGEN_INSN_RX (insn));
 462       free (CGEN_INSN_RX (insn));
 463       (CGEN_INSN_RX (insn)) = NULL;
 464       return msg;
 465     }
 466 }
 467
 468 \f
 469 /* Default insn parser.
 470
 471    The syntax string is scanned and operands are parsed and stored in FIELDS.
 472    Relocs are queued as we go via other callbacks.
 473
 474    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 475    parse the instruction, we return 0 and the caller will start over from
 476    the beginning.  Backtracking will be necessary in parsing subexpressions,
 477    but that can be handled there.  Not handling backtracking here may get
 478    expensive in the case of the m68k.  Deal with later.
 479
 480    Returns NULL for success, an error message for failure.  */
 481
 482 static const char *
 483 parse_insn_normal (cd, insn, strp, fields)
 484      CGEN_CPU_DESC cd;
 485      const CGEN_INSN *insn;
 486      const char **strp;
 487      CGEN_FIELDS *fields;
 488 {
 489   /* ??? Runtime added insns not handled yet.  */
 490   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 491   const char *str = *strp;
 492   const char *errmsg;
 493   const char *p;
 494   const CGEN_SYNTAX_CHAR_TYPE * syn;
 495 #ifdef CGEN_MNEMONIC_OPERANDS
 496   /* FIXME: wip */
 497   int past_opcode_p;
 498 #endif
 499
 500   /* For now we assume the mnemonic is first (there are no leading operands).
 501      We can parse it without needing to set up operand parsing.
 502      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 503      not be called from GAS.  */
 504   p = CGEN_INSN_MNEMONIC (insn);
 505   while (*p && TOLOWER (*p) == TOLOWER (*str))
 506     ++p, ++str;
 507
 508   if (* p)
 509     return _("unrecognized instruction");
 510
 511 #ifndef CGEN_MNEMONIC_OPERANDS
 512   if (* str && ! ISSPACE (* str))
 513     return _("unrecognized instruction");
 514 #endif
 515
 516   CGEN_INIT_PARSE (cd);
 517   cgen_init_parse_operand (cd);
 518 #ifdef CGEN_MNEMONIC_OPERANDS
 519   past_opcode_p = 0;
 520 #endif
 521
 522   /* We don't check for (*str != '\0') here because we want to parse
 523      any trailing fake arguments in the syntax string.  */
 524   syn = CGEN_SYNTAX_STRING (syntax);
 525
 526   /* Mnemonics come first for now, ensure valid string.  */
 527   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 528     abort ();
 529
 530   ++syn;
 531
 532   while (* syn != 0)
 533     {
 534       /* Non operand chars must match exactly.  */
 535       if (CGEN_SYNTAX_CHAR_P (* syn))
 536         {
 537           /* FIXME: While we allow for non-GAS callers above, we assume the
 538              first char after the mnemonic part is a space.  */
 539           /* FIXME: We also take inappropriate advantage of the fact that
 540              GAS's input scrubber will remove extraneous blanks.  */
 541           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 542             {
 543 #ifdef CGEN_MNEMONIC_OPERANDS
 544               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 545                 past_opcode_p = 1;
 546 #endif
 547               ++ syn;
 548               ++ str;
 549             }
 550           else if (*str)
 551             {
 552               /* Syntax char didn't match.  Can't be this insn.  */
 553               static char msg [80];
 554
 555               /* xgettext:c-format */
 556               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 557                        CGEN_SYNTAX_CHAR(*syn), *str);
 558               return msg;
 559             }
 560           else
 561             {
 562               /* Ran out of input.  */
 563               static char msg [80];
 564
 565               /* xgettext:c-format */
 566               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 567                        CGEN_SYNTAX_CHAR(*syn));
 568               return msg;
 569             }
 570           continue;
 571         }
 572
 573       /* We have an operand of some sort.  */
 574       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 575                                           &str, fields);
 576       if (errmsg)
 577         return errmsg;
 578
 579       /* Done with this operand, continue with next one.  */
 580       ++ syn;
 581     }
 582
 583   /* If we're at the end of the syntax string, we're done.  */
 584   if (* syn == 0)
 585     {
 586       /* FIXME: For the moment we assume a valid `str' can only contain
 587          blanks now.  IE: We needn't try again with a longer version of
 588          the insn and it is assumed that longer versions of insns appear
 589          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 590       while (ISSPACE (* str))
 591         ++ str;
 592
 593       if (* str != '\0')
 594         return _("junk at end of line"); /* FIXME: would like to include `str' */
 595
 596       return NULL;
 597     }
 598
 599   /* We couldn't parse it.  */
 600   return _("unrecognized instruction");
 601 }
 602 \f
 603 /* Main entry point.
 604    This routine is called for each instruction to be assembled.
 605    STR points to the insn to be assembled.
 606    We assume all necessary tables have been initialized.
 607    The assembled instruction, less any fixups, is stored in BUF.
 608    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 609    still needs to be converted to target byte order, otherwise BUF is an array
 610    of bytes in target byte order.
 611    The result is a pointer to the insn's entry in the opcode table,
 612    or NULL if an error occured (an error message will have already been
 613    printed).
 614
 615    Note that when processing (non-alias) macro-insns,
 616    this function recurses.
 617
 618    ??? It's possible to make this cpu-independent.
 619    One would have to deal with a few minor things.
 620    At this point in time doing so would be more of a curiosity than useful
 621    [for example this file isn't _that_ big], but keeping the possibility in
 622    mind helps keep the design clean.  */
 623
 624 const CGEN_INSN *
 625 fr30_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 626      CGEN_CPU_DESC cd;
 627      const char *str;
 628      CGEN_FIELDS *fields;
 629      CGEN_INSN_BYTES_PTR buf;
 630      char **errmsg;
 631 {
 632   const char *start;
 633   CGEN_INSN_LIST *ilist;
 634   const char *parse_errmsg = NULL;
 635   const char *insert_errmsg = NULL;
 636   int recognized_mnemonic = 0;
 637
 638   /* Skip leading white space.  */
 639   while (ISSPACE (* str))
 640     ++ str;
 641
 642   /* The instructions are stored in hashed lists.
 643      Get the first in the list.  */
 644   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 645
 646   /* Keep looking until we find a match.  */
 647   start = str;
 648   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 649     {
 650       const CGEN_INSN *insn = ilist->insn;
 651       recognized_mnemonic = 1;
 652
 653 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 654       /* Not usually needed as unsupported opcodes
 655          shouldn't be in the hash lists.  */
 656       /* Is this insn supported by the selected cpu?  */
 657       if (! fr30_cgen_insn_supported (cd, insn))
 658         continue;
 659 #endif
 660       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 661          chosen immediately.  Instead, it is used during assembler/linker
 662          relaxation if possible.  */
 663       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 664         continue;
 665
 666       str = start;
 667
 668       /* Skip this insn if str doesn't look right lexically.  */
 669       if (CGEN_INSN_RX (insn) != NULL &&
 670           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 671         continue;
 672
 673       /* Allow parse/insert handlers to obtain length of insn.  */
 674       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 675
 676       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 677       if (parse_errmsg != NULL)
 678         continue;
 679
 680       /* ??? 0 is passed for `pc'.  */
 681       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 682                                                  (bfd_vma) 0);
 683       if (insert_errmsg != NULL)
 684         continue;
 685
 686       /* It is up to the caller to actually output the insn and any
 687          queued relocs.  */
 688       return insn;
 689     }
 690
 691   {
 692     static char errbuf[150];
 693 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 694     const char *tmp_errmsg;
 695
 696     /* If requesting verbose error messages, use insert_errmsg.
 697        Failing that, use parse_errmsg.  */
 698     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 699                   parse_errmsg ? parse_errmsg :
 700                   recognized_mnemonic ?
 701                   _("unrecognized form of instruction") :
 702                   _("unrecognized instruction"));
 703
 704     if (strlen (start) > 50)
 705       /* xgettext:c-format */
 706       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 707     else
 708       /* xgettext:c-format */
 709       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 710 #else
 711     if (strlen (start) > 50)
 712       /* xgettext:c-format */
 713       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 714     else
 715       /* xgettext:c-format */
 716       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 717 #endif
 718
 719     *errmsg = errbuf;
 720     return NULL;
 721   }
 722 }
 723 \f
 724 #if 0 /* This calls back to GAS which we can't do without care.  */
 725
 726 /* Record each member of OPVALS in the assembler's symbol table.
 727    This lets GAS parse registers for us.
 728    ??? Interesting idea but not currently used.  */
 729
 730 /* Record each member of OPVALS in the assembler's symbol table.
 731    FIXME: Not currently used.  */
 732
 733 void
 734 fr30_cgen_asm_hash_keywords (cd, opvals)
 735      CGEN_CPU_DESC cd;
 736      CGEN_KEYWORD *opvals;
 737 {
 738   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 739   const CGEN_KEYWORD_ENTRY * ke;
 740
 741   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 742     {
 743 #if 0 /* Unnecessary, should be done in the search routine.  */
 744       if (! fr30_cgen_opval_supported (ke))
 745         continue;
 746 #endif
 747       cgen_asm_record_register (cd, ke->name, ke->value);
 748     }
 749 }
 750
 751 #endif /* 0 */