opcodes/openrisc-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 "openrisc-desc.h"
  34 #include "openrisc-opc.h"
  35 #include "opintl.h"
  36 #include "xregex.h"
  37 #include "libiberty.h"
  38 #include "safe-ctype.h"
  39
  40 #undef  min
  41 #define min(a,b) ((a) < (b) ? (a) : (b))
  42 #undef  max
  43 #define max(a,b) ((a) > (b) ? (a) : (b))
  44
  45 static const char * parse_insn_normal
  46   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  47 \f
  48 /* -- assembler routines inserted here.  */
  49
  50 /* -- asm.c */
  51
  52 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
  53
  54 static const char * parse_hi16
  55   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  56 static const char * parse_lo16
  57   PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  58
  59 long
  60 openrisc_sign_extend_16bit (value)
  61      long value;
  62 {
  63   return (long) (short) value;
  64 }
  65
  66 /* Handle hi().  */
  67
  68 static const char *
  69 parse_hi16 (cd, strp, opindex, valuep)
  70      CGEN_CPU_DESC cd;
  71      const char **strp;
  72      int opindex;
  73      unsigned long *valuep;
  74 {
  75   const char *errmsg;
  76   enum cgen_parse_operand_result result_type;
  77   bfd_vma value;
  78
  79   if (**strp == '#')
  80     ++*strp;
  81
  82   if (strncasecmp (*strp, "hi(", 3) == 0)
  83     {
  84       *strp += 3;
  85
  86 #if 0
  87       errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
  88       if (errmsg != NULL)
  89         fprintf (stderr, "parse_hi: %s\n", errmsg);
  90       if (errmsg != NULL)
  91 #endif
  92         errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
  93                                      &result_type, &value);
  94       if (**strp != ')')
  95         return "missing `)'";
  96       ++*strp;
  97       if (errmsg == NULL
  98           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
  99         value >>= 16;
 100       *valuep = (long) (short) value;
 101
 102       return errmsg;
 103     }
 104   else
 105     {
 106       if (**strp == '-')
 107         errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
 108       else
 109         errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
 110     }
 111   *valuep = (long) (short) (value & 0xffff);
 112   return errmsg;
 113 }
 114
 115 /* Handle lo().  */
 116
 117 static const char *
 118 parse_lo16 (cd, strp, opindex, valuep)
 119      CGEN_CPU_DESC cd;
 120      const char **strp;
 121      int opindex;
 122      unsigned long *valuep;
 123 {
 124   const char *errmsg;
 125   enum cgen_parse_operand_result result_type;
 126   bfd_vma value;
 127
 128   if (**strp == '#')
 129     ++*strp;
 130
 131   if (strncasecmp (*strp, "lo(", 3) == 0)
 132     {
 133       *strp += 3;
 134
 135 #if 0
 136       errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
 137       if (errmsg != NULL)
 138         fprintf (stderr, "parse_lo: %s\n", errmsg);
 139
 140       if (errmsg != NULL)
 141 #endif
 142         errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 143                                      &result_type, &value);
 144       if (**strp != ')')
 145         return "missing `)'";
 146       ++*strp;
 147       if (errmsg == NULL
 148           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 149         value &= 0xffff;
 150       *valuep = (long) (short) value;
 151
 152       return errmsg;
 153     }
 154
 155   if (**strp == '-')
 156     errmsg = cgen_parse_signed_integer (cd, strp, opindex, (long *) &value);
 157   else
 158     errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, (unsigned long *) &value);
 159   *valuep = (long) (short) (value & 0xffff);
 160   return errmsg;
 161 }
 162
 163 /* -- */
 164
 165 const char * openrisc_cgen_parse_operand
 166   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 167
 168 /* Main entry point for operand parsing.
 169
 170    This function is basically just a big switch statement.  Earlier versions
 171    used tables to look up the function to use, but
 172    - if the table contains both assembler and disassembler functions then
 173      the disassembler contains much of the assembler and vice-versa,
 174    - there's a lot of inlining possibilities as things grow,
 175    - using a switch statement avoids the function call overhead.
 176
 177    This function could be moved into `parse_insn_normal', but keeping it
 178    separate makes clear the interface between `parse_insn_normal' and each of
 179    the handlers.  */
 180
 181 const char *
 182 openrisc_cgen_parse_operand (cd, opindex, strp, fields)
 183      CGEN_CPU_DESC cd;
 184      int opindex;
 185      const char ** strp;
 186      CGEN_FIELDS * fields;
 187 {
 188   const char * errmsg = NULL;
 189   /* Used by scalar operands that still need to be parsed.  */
 190   long junk ATTRIBUTE_UNUSED;
 191
 192   switch (opindex)
 193     {
 194     case OPENRISC_OPERAND_ABS_26 :
 195       {
 196         bfd_vma value;
 197         errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL,  & value);
 198         fields->f_abs26 = value;
 199       }
 200       break;
 201     case OPENRISC_OPERAND_DISP_26 :
 202       {
 203         bfd_vma value;
 204         errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL,  & value);
 205         fields->f_disp26 = value;
 206       }
 207       break;
 208     case OPENRISC_OPERAND_HI16 :
 209       errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, &fields->f_simm16);
 210       break;
 211     case OPENRISC_OPERAND_LO16 :
 212       errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, &fields->f_lo16);
 213       break;
 214     case OPENRISC_OPERAND_OP_F_23 :
 215       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, &fields->f_op4);
 216       break;
 217     case OPENRISC_OPERAND_OP_F_3 :
 218       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, &fields->f_op5);
 219       break;
 220     case OPENRISC_OPERAND_RA :
 221       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
 222       break;
 223     case OPENRISC_OPERAND_RB :
 224       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
 225       break;
 226     case OPENRISC_OPERAND_RD :
 227       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
 228       break;
 229     case OPENRISC_OPERAND_SIMM_16 :
 230       errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, &fields->f_simm16);
 231       break;
 232     case OPENRISC_OPERAND_UI16NC :
 233       errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, &fields->f_i16nc);
 234       break;
 235     case OPENRISC_OPERAND_UIMM_16 :
 236       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, &fields->f_uimm16);
 237       break;
 238     case OPENRISC_OPERAND_UIMM_5 :
 239       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, &fields->f_uimm5);
 240       break;
 241
 242     default :
 243       /* xgettext:c-format */
 244       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 245       abort ();
 246   }
 247
 248   return errmsg;
 249 }
 250
 251 cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
 252 {
 253   parse_insn_normal,
 254 };
 255
 256 void
 257 openrisc_cgen_init_asm (cd)
 258      CGEN_CPU_DESC cd;
 259 {
 260   openrisc_cgen_init_opcode_table (cd);
 261   openrisc_cgen_init_ibld_table (cd);
 262   cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
 263   cd->parse_operand = openrisc_cgen_parse_operand;
 264 }
 265
 266 \f
 267
 268 /* Regex construction routine.
 269
 270    This translates an opcode syntax string into a regex string,
 271    by replacing any non-character syntax element (such as an
 272    opcode) with the pattern '.*'
 273
 274    It then compiles the regex and stores it in the opcode, for
 275    later use by openrisc_cgen_assemble_insn
 276
 277    Returns NULL for success, an error message for failure.  */
 278
 279 char *
 280 openrisc_cgen_build_insn_regex (CGEN_INSN *insn)
 281 {
 282   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 283   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 284   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 285   char *rx = rxbuf;
 286   const CGEN_SYNTAX_CHAR_TYPE *syn;
 287   int reg_err;
 288
 289   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 290
 291   /* Mnemonics come first in the syntax string.  */
 292   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 293     return _("missing mnemonic in syntax string");
 294   ++syn;
 295
 296   /* Generate a case sensitive regular expression that emulates case
 297      insensitive matching in the "C" locale.  We cannot generate a case
 298      insensitive regular expression because in Turkish locales, 'i' and 'I'
 299      are not equal modulo case conversion.  */
 300
 301   /* Copy the literal mnemonic out of the insn.  */
 302   for (; *mnem; mnem++)
 303     {
 304       char c = *mnem;
 305
 306       if (ISALPHA (c))
 307         {
 308           *rx++ = '[';
 309           *rx++ = TOLOWER (c);
 310           *rx++ = TOUPPER (c);
 311           *rx++ = ']';
 312         }
 313       else
 314         *rx++ = c;
 315     }
 316
 317   /* Copy any remaining literals from the syntax string into the rx.  */
 318   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 319     {
 320       if (CGEN_SYNTAX_CHAR_P (* syn))
 321         {
 322           char c = CGEN_SYNTAX_CHAR (* syn);
 323
 324           switch (c)
 325             {
 326               /* Escape any regex metacharacters in the syntax.  */
 327             case '.': case '[': case '\\':
 328             case '*': case '^': case '$':
 329
 330 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 331             case '?': case '{': case '}':
 332             case '(': case ')': case '*':
 333             case '|': case '+': case ']':
 334 #endif
 335               *rx++ = '\\';
 336               *rx++ = c;
 337               break;
 338
 339             default:
 340               if (ISALPHA (c))
 341                 {
 342                   *rx++ = '[';
 343                   *rx++ = TOLOWER (c);
 344                   *rx++ = TOUPPER (c);
 345                   *rx++ = ']';
 346                 }
 347               else
 348                 *rx++ = c;
 349               break;
 350             }
 351         }
 352       else
 353         {
 354           /* Replace non-syntax fields with globs.  */
 355           *rx++ = '.';
 356           *rx++ = '*';
 357         }
 358     }
 359
 360   /* Trailing whitespace ok.  */
 361   * rx++ = '[';
 362   * rx++ = ' ';
 363   * rx++ = '\t';
 364   * rx++ = ']';
 365   * rx++ = '*';
 366
 367   /* But anchor it after that.  */
 368   * rx++ = '$';
 369   * rx = '\0';
 370
 371   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 372   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 373
 374   if (reg_err == 0)
 375     return NULL;
 376   else
 377     {
 378       static char msg[80];
 379
 380       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 381       regfree ((regex_t *) CGEN_INSN_RX (insn));
 382       free (CGEN_INSN_RX (insn));
 383       (CGEN_INSN_RX (insn)) = NULL;
 384       return msg;
 385     }
 386 }
 387
 388 \f
 389 /* Default insn parser.
 390
 391    The syntax string is scanned and operands are parsed and stored in FIELDS.
 392    Relocs are queued as we go via other callbacks.
 393
 394    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 395    parse the instruction, we return 0 and the caller will start over from
 396    the beginning.  Backtracking will be necessary in parsing subexpressions,
 397    but that can be handled there.  Not handling backtracking here may get
 398    expensive in the case of the m68k.  Deal with later.
 399
 400    Returns NULL for success, an error message for failure.  */
 401
 402 static const char *
 403 parse_insn_normal (CGEN_CPU_DESC cd,
 404                    const CGEN_INSN *insn,
 405                    const char **strp,
 406                    CGEN_FIELDS *fields)
 407 {
 408   /* ??? Runtime added insns not handled yet.  */
 409   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 410   const char *str = *strp;
 411   const char *errmsg;
 412   const char *p;
 413   const CGEN_SYNTAX_CHAR_TYPE * syn;
 414 #ifdef CGEN_MNEMONIC_OPERANDS
 415   /* FIXME: wip */
 416   int past_opcode_p;
 417 #endif
 418
 419   /* For now we assume the mnemonic is first (there are no leading operands).
 420      We can parse it without needing to set up operand parsing.
 421      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 422      not be called from GAS.  */
 423   p = CGEN_INSN_MNEMONIC (insn);
 424   while (*p && TOLOWER (*p) == TOLOWER (*str))
 425     ++p, ++str;
 426
 427   if (* p)
 428     return _("unrecognized instruction");
 429
 430 #ifndef CGEN_MNEMONIC_OPERANDS
 431   if (* str && ! ISSPACE (* str))
 432     return _("unrecognized instruction");
 433 #endif
 434
 435   CGEN_INIT_PARSE (cd);
 436   cgen_init_parse_operand (cd);
 437 #ifdef CGEN_MNEMONIC_OPERANDS
 438   past_opcode_p = 0;
 439 #endif
 440
 441   /* We don't check for (*str != '\0') here because we want to parse
 442      any trailing fake arguments in the syntax string.  */
 443   syn = CGEN_SYNTAX_STRING (syntax);
 444
 445   /* Mnemonics come first for now, ensure valid string.  */
 446   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 447     abort ();
 448
 449   ++syn;
 450
 451   while (* syn != 0)
 452     {
 453       /* Non operand chars must match exactly.  */
 454       if (CGEN_SYNTAX_CHAR_P (* syn))
 455         {
 456           /* FIXME: While we allow for non-GAS callers above, we assume the
 457              first char after the mnemonic part is a space.  */
 458           /* FIXME: We also take inappropriate advantage of the fact that
 459              GAS's input scrubber will remove extraneous blanks.  */
 460           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 461             {
 462 #ifdef CGEN_MNEMONIC_OPERANDS
 463               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 464                 past_opcode_p = 1;
 465 #endif
 466               ++ syn;
 467               ++ str;
 468             }
 469           else if (*str)
 470             {
 471               /* Syntax char didn't match.  Can't be this insn.  */
 472               static char msg [80];
 473
 474               /* xgettext:c-format */
 475               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 476                        CGEN_SYNTAX_CHAR(*syn), *str);
 477               return msg;
 478             }
 479           else
 480             {
 481               /* Ran out of input.  */
 482               static char msg [80];
 483
 484               /* xgettext:c-format */
 485               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 486                        CGEN_SYNTAX_CHAR(*syn));
 487               return msg;
 488             }
 489           continue;
 490         }
 491
 492       /* We have an operand of some sort.  */
 493       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 494                                           &str, fields);
 495       if (errmsg)
 496         return errmsg;
 497
 498       /* Done with this operand, continue with next one.  */
 499       ++ syn;
 500     }
 501
 502   /* If we're at the end of the syntax string, we're done.  */
 503   if (* syn == 0)
 504     {
 505       /* FIXME: For the moment we assume a valid `str' can only contain
 506          blanks now.  IE: We needn't try again with a longer version of
 507          the insn and it is assumed that longer versions of insns appear
 508          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 509       while (ISSPACE (* str))
 510         ++ str;
 511
 512       if (* str != '\0')
 513         return _("junk at end of line"); /* FIXME: would like to include `str' */
 514
 515       return NULL;
 516     }
 517
 518   /* We couldn't parse it.  */
 519   return _("unrecognized instruction");
 520 }
 521 \f
 522 /* Main entry point.
 523    This routine is called for each instruction to be assembled.
 524    STR points to the insn to be assembled.
 525    We assume all necessary tables have been initialized.
 526    The assembled instruction, less any fixups, is stored in BUF.
 527    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 528    still needs to be converted to target byte order, otherwise BUF is an array
 529    of bytes in target byte order.
 530    The result is a pointer to the insn's entry in the opcode table,
 531    or NULL if an error occured (an error message will have already been
 532    printed).
 533
 534    Note that when processing (non-alias) macro-insns,
 535    this function recurses.
 536
 537    ??? It's possible to make this cpu-independent.
 538    One would have to deal with a few minor things.
 539    At this point in time doing so would be more of a curiosity than useful
 540    [for example this file isn't _that_ big], but keeping the possibility in
 541    mind helps keep the design clean.  */
 542
 543 const CGEN_INSN *
 544 openrisc_cgen_assemble_insn (CGEN_CPU_DESC cd,
 545                            const char *str,
 546                            CGEN_FIELDS *fields,
 547                            CGEN_INSN_BYTES_PTR buf,
 548                            char **errmsg)
 549 {
 550   const char *start;
 551   CGEN_INSN_LIST *ilist;
 552   const char *parse_errmsg = NULL;
 553   const char *insert_errmsg = NULL;
 554   int recognized_mnemonic = 0;
 555
 556   /* Skip leading white space.  */
 557   while (ISSPACE (* str))
 558     ++ str;
 559
 560   /* The instructions are stored in hashed lists.
 561      Get the first in the list.  */
 562   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 563
 564   /* Keep looking until we find a match.  */
 565   start = str;
 566   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 567     {
 568       const CGEN_INSN *insn = ilist->insn;
 569       recognized_mnemonic = 1;
 570
 571 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 572       /* Not usually needed as unsupported opcodes
 573          shouldn't be in the hash lists.  */
 574       /* Is this insn supported by the selected cpu?  */
 575       if (! openrisc_cgen_insn_supported (cd, insn))
 576         continue;
 577 #endif
 578       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 579          chosen immediately.  Instead, it is used during assembler/linker
 580          relaxation if possible.  */
 581       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 582         continue;
 583
 584       str = start;
 585
 586       /* Skip this insn if str doesn't look right lexically.  */
 587       if (CGEN_INSN_RX (insn) != NULL &&
 588           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 589         continue;
 590
 591       /* Allow parse/insert handlers to obtain length of insn.  */
 592       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 593
 594       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 595       if (parse_errmsg != NULL)
 596         continue;
 597
 598       /* ??? 0 is passed for `pc'.  */
 599       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 600                                                  (bfd_vma) 0);
 601       if (insert_errmsg != NULL)
 602         continue;
 603
 604       /* It is up to the caller to actually output the insn and any
 605          queued relocs.  */
 606       return insn;
 607     }
 608
 609   {
 610     static char errbuf[150];
 611 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 612     const char *tmp_errmsg;
 613
 614     /* If requesting verbose error messages, use insert_errmsg.
 615        Failing that, use parse_errmsg.  */
 616     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 617                   parse_errmsg ? parse_errmsg :
 618                   recognized_mnemonic ?
 619                   _("unrecognized form of instruction") :
 620                   _("unrecognized instruction"));
 621
 622     if (strlen (start) > 50)
 623       /* xgettext:c-format */
 624       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 625     else
 626       /* xgettext:c-format */
 627       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 628 #else
 629     if (strlen (start) > 50)
 630       /* xgettext:c-format */
 631       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 632     else
 633       /* xgettext:c-format */
 634       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 635 #endif
 636
 637     *errmsg = errbuf;
 638     return NULL;
 639   }
 640 }
 641 \f
 642 #if 0 /* This calls back to GAS which we can't do without care.  */
 643
 644 /* Record each member of OPVALS in the assembler's symbol table.
 645    This lets GAS parse registers for us.
 646    ??? Interesting idea but not currently used.  */
 647
 648 /* Record each member of OPVALS in the assembler's symbol table.
 649    FIXME: Not currently used.  */
 650
 651 void
 652 openrisc_cgen_asm_hash_keywords (CGEN_CPU_DESC cd, CGEN_KEYWORD *opvals)
 653 {
 654   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 655   const CGEN_KEYWORD_ENTRY * ke;
 656
 657   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 658     {
 659 #if 0 /* Unnecessary, should be done in the search routine.  */
 660       if (! openrisc_cgen_opval_supported (ke))
 661         continue;
 662 #endif
 663       cgen_asm_record_register (cd, ke->name, ke->value);
 664     }
 665 }
 666
 667 #endif /* 0 */