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