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      PARAMS ((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 (insn)
 281      CGEN_INSN *insn;
 282 {
 283   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 284   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 285   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 286   char *rx = rxbuf;
 287   const CGEN_SYNTAX_CHAR_TYPE *syn;
 288   int reg_err;
 289
 290   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 291
 292   /* Mnemonics come first in the syntax string.  */
 293   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 294     return _("missing mnemonic in syntax string");
 295   ++syn;
 296
 297   /* Generate a case sensitive regular expression that emulates case
 298      insensitive matching in the "C" locale.  We cannot generate a case
 299      insensitive regular expression because in Turkish locales, 'i' and 'I'
 300      are not equal modulo case conversion.  */
 301
 302   /* Copy the literal mnemonic out of the insn.  */
 303   for (; *mnem; mnem++)
 304     {
 305       char c = *mnem;
 306
 307       if (ISALPHA (c))
 308         {
 309           *rx++ = '[';
 310           *rx++ = TOLOWER (c);
 311           *rx++ = TOUPPER (c);
 312           *rx++ = ']';
 313         }
 314       else
 315         *rx++ = c;
 316     }
 317
 318   /* Copy any remaining literals from the syntax string into the rx.  */
 319   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 320     {
 321       if (CGEN_SYNTAX_CHAR_P (* syn))
 322         {
 323           char c = CGEN_SYNTAX_CHAR (* syn);
 324
 325           switch (c)
 326             {
 327               /* Escape any regex metacharacters in the syntax.  */
 328             case '.': case '[': case '\\':
 329             case '*': case '^': case '$':
 330
 331 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 332             case '?': case '{': case '}':
 333             case '(': case ')': case '*':
 334             case '|': case '+': case ']':
 335 #endif
 336               *rx++ = '\\';
 337               *rx++ = c;
 338               break;
 339
 340             default:
 341               if (ISALPHA (c))
 342                 {
 343                   *rx++ = '[';
 344                   *rx++ = TOLOWER (c);
 345                   *rx++ = TOUPPER (c);
 346                   *rx++ = ']';
 347                 }
 348               else
 349                 *rx++ = c;
 350               break;
 351             }
 352         }
 353       else
 354         {
 355           /* Replace non-syntax fields with globs.  */
 356           *rx++ = '.';
 357           *rx++ = '*';
 358         }
 359     }
 360
 361   /* Trailing whitespace ok.  */
 362   * rx++ = '[';
 363   * rx++ = ' ';
 364   * rx++ = '\t';
 365   * rx++ = ']';
 366   * rx++ = '*';
 367
 368   /* But anchor it after that.  */
 369   * rx++ = '$';
 370   * rx = '\0';
 371
 372   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 373   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 374
 375   if (reg_err == 0)
 376     return NULL;
 377   else
 378     {
 379       static char msg[80];
 380
 381       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 382       regfree ((regex_t *) CGEN_INSN_RX (insn));
 383       free (CGEN_INSN_RX (insn));
 384       (CGEN_INSN_RX (insn)) = NULL;
 385       return msg;
 386     }
 387 }
 388
 389 \f
 390 /* Default insn parser.
 391
 392    The syntax string is scanned and operands are parsed and stored in FIELDS.
 393    Relocs are queued as we go via other callbacks.
 394
 395    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 396    parse the instruction, we return 0 and the caller will start over from
 397    the beginning.  Backtracking will be necessary in parsing subexpressions,
 398    but that can be handled there.  Not handling backtracking here may get
 399    expensive in the case of the m68k.  Deal with later.
 400
 401    Returns NULL for success, an error message for failure.  */
 402
 403 static const char *
 404 parse_insn_normal (cd, insn, strp, fields)
 405      CGEN_CPU_DESC cd;
 406      const CGEN_INSN *insn;
 407      const char **strp;
 408      CGEN_FIELDS *fields;
 409 {
 410   /* ??? Runtime added insns not handled yet.  */
 411   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 412   const char *str = *strp;
 413   const char *errmsg;
 414   const char *p;
 415   const CGEN_SYNTAX_CHAR_TYPE * syn;
 416 #ifdef CGEN_MNEMONIC_OPERANDS
 417   /* FIXME: wip */
 418   int past_opcode_p;
 419 #endif
 420
 421   /* For now we assume the mnemonic is first (there are no leading operands).
 422      We can parse it without needing to set up operand parsing.
 423      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 424      not be called from GAS.  */
 425   p = CGEN_INSN_MNEMONIC (insn);
 426   while (*p && TOLOWER (*p) == TOLOWER (*str))
 427     ++p, ++str;
 428
 429   if (* p)
 430     return _("unrecognized instruction");
 431
 432 #ifndef CGEN_MNEMONIC_OPERANDS
 433   if (* str && ! ISSPACE (* str))
 434     return _("unrecognized instruction");
 435 #endif
 436
 437   CGEN_INIT_PARSE (cd);
 438   cgen_init_parse_operand (cd);
 439 #ifdef CGEN_MNEMONIC_OPERANDS
 440   past_opcode_p = 0;
 441 #endif
 442
 443   /* We don't check for (*str != '\0') here because we want to parse
 444      any trailing fake arguments in the syntax string.  */
 445   syn = CGEN_SYNTAX_STRING (syntax);
 446
 447   /* Mnemonics come first for now, ensure valid string.  */
 448   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 449     abort ();
 450
 451   ++syn;
 452
 453   while (* syn != 0)
 454     {
 455       /* Non operand chars must match exactly.  */
 456       if (CGEN_SYNTAX_CHAR_P (* syn))
 457         {
 458           /* FIXME: While we allow for non-GAS callers above, we assume the
 459              first char after the mnemonic part is a space.  */
 460           /* FIXME: We also take inappropriate advantage of the fact that
 461              GAS's input scrubber will remove extraneous blanks.  */
 462           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 463             {
 464 #ifdef CGEN_MNEMONIC_OPERANDS
 465               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 466                 past_opcode_p = 1;
 467 #endif
 468               ++ syn;
 469               ++ str;
 470             }
 471           else if (*str)
 472             {
 473               /* Syntax char didn't match.  Can't be this insn.  */
 474               static char msg [80];
 475
 476               /* xgettext:c-format */
 477               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 478                        CGEN_SYNTAX_CHAR(*syn), *str);
 479               return msg;
 480             }
 481           else
 482             {
 483               /* Ran out of input.  */
 484               static char msg [80];
 485
 486               /* xgettext:c-format */
 487               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 488                        CGEN_SYNTAX_CHAR(*syn));
 489               return msg;
 490             }
 491           continue;
 492         }
 493
 494       /* We have an operand of some sort.  */
 495       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 496                                           &str, fields);
 497       if (errmsg)
 498         return errmsg;
 499
 500       /* Done with this operand, continue with next one.  */
 501       ++ syn;
 502     }
 503
 504   /* If we're at the end of the syntax string, we're done.  */
 505   if (* syn == 0)
 506     {
 507       /* FIXME: For the moment we assume a valid `str' can only contain
 508          blanks now.  IE: We needn't try again with a longer version of
 509          the insn and it is assumed that longer versions of insns appear
 510          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 511       while (ISSPACE (* str))
 512         ++ str;
 513
 514       if (* str != '\0')
 515         return _("junk at end of line"); /* FIXME: would like to include `str' */
 516
 517       return NULL;
 518     }
 519
 520   /* We couldn't parse it.  */
 521   return _("unrecognized instruction");
 522 }
 523 \f
 524 /* Main entry point.
 525    This routine is called for each instruction to be assembled.
 526    STR points to the insn to be assembled.
 527    We assume all necessary tables have been initialized.
 528    The assembled instruction, less any fixups, is stored in BUF.
 529    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 530    still needs to be converted to target byte order, otherwise BUF is an array
 531    of bytes in target byte order.
 532    The result is a pointer to the insn's entry in the opcode table,
 533    or NULL if an error occured (an error message will have already been
 534    printed).
 535
 536    Note that when processing (non-alias) macro-insns,
 537    this function recurses.
 538
 539    ??? It's possible to make this cpu-independent.
 540    One would have to deal with a few minor things.
 541    At this point in time doing so would be more of a curiosity than useful
 542    [for example this file isn't _that_ big], but keeping the possibility in
 543    mind helps keep the design clean.  */
 544
 545 const CGEN_INSN *
 546 openrisc_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 547      CGEN_CPU_DESC cd;
 548      const char *str;
 549      CGEN_FIELDS *fields;
 550      CGEN_INSN_BYTES_PTR buf;
 551      char **errmsg;
 552 {
 553   const char *start;
 554   CGEN_INSN_LIST *ilist;
 555   const char *parse_errmsg = NULL;
 556   const char *insert_errmsg = NULL;
 557   int recognized_mnemonic = 0;
 558
 559   /* Skip leading white space.  */
 560   while (ISSPACE (* str))
 561     ++ str;
 562
 563   /* The instructions are stored in hashed lists.
 564      Get the first in the list.  */
 565   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 566
 567   /* Keep looking until we find a match.  */
 568   start = str;
 569   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 570     {
 571       const CGEN_INSN *insn = ilist->insn;
 572       recognized_mnemonic = 1;
 573
 574 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 575       /* Not usually needed as unsupported opcodes
 576          shouldn't be in the hash lists.  */
 577       /* Is this insn supported by the selected cpu?  */
 578       if (! openrisc_cgen_insn_supported (cd, insn))
 579         continue;
 580 #endif
 581       /* If the RELAX attribute is set, this is an insn that shouldn't be
 582          chosen immediately.  Instead, it is used during assembler/linker
 583          relaxation if possible.  */
 584       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
 585         continue;
 586
 587       str = start;
 588
 589       /* Skip this insn if str doesn't look right lexically.  */
 590       if (CGEN_INSN_RX (insn) != NULL &&
 591           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 592         continue;
 593
 594       /* Allow parse/insert handlers to obtain length of insn.  */
 595       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 596
 597       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 598       if (parse_errmsg != NULL)
 599         continue;
 600
 601       /* ??? 0 is passed for `pc'.  */
 602       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 603                                                  (bfd_vma) 0);
 604       if (insert_errmsg != NULL)
 605         continue;
 606
 607       /* It is up to the caller to actually output the insn and any
 608          queued relocs.  */
 609       return insn;
 610     }
 611
 612   {
 613     static char errbuf[150];
 614 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 615     const char *tmp_errmsg;
 616
 617     /* If requesting verbose error messages, use insert_errmsg.
 618        Failing that, use parse_errmsg.  */
 619     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 620                   parse_errmsg ? parse_errmsg :
 621                   recognized_mnemonic ?
 622                   _("unrecognized form of instruction") :
 623                   _("unrecognized instruction"));
 624
 625     if (strlen (start) > 50)
 626       /* xgettext:c-format */
 627       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 628     else
 629       /* xgettext:c-format */
 630       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 631 #else
 632     if (strlen (start) > 50)
 633       /* xgettext:c-format */
 634       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 635     else
 636       /* xgettext:c-format */
 637       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 638 #endif
 639
 640     *errmsg = errbuf;
 641     return NULL;
 642   }
 643 }
 644 \f
 645 #if 0 /* This calls back to GAS which we can't do without care.  */
 646
 647 /* Record each member of OPVALS in the assembler's symbol table.
 648    This lets GAS parse registers for us.
 649    ??? Interesting idea but not currently used.  */
 650
 651 /* Record each member of OPVALS in the assembler's symbol table.
 652    FIXME: Not currently used.  */
 653
 654 void
 655 openrisc_cgen_asm_hash_keywords (cd, opvals)
 656      CGEN_CPU_DESC cd;
 657      CGEN_KEYWORD *opvals;
 658 {
 659   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 660   const CGEN_KEYWORD_ENTRY * ke;
 661
 662   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 663     {
 664 #if 0 /* Unnecessary, should be done in the search routine.  */
 665       if (! openrisc_cgen_opval_supported (ke))
 666         continue;
 667 #endif
 668       cgen_asm_record_register (cd, ke->name, ke->value);
 669     }
 670 }
 671
 672 #endif /* 0 */