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
 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 /* Regex construction routine.
 349
 350    This translates an opcode syntax string into a regex string,
 351    by replacing any non-character syntax element (such as an
 352    opcode) with the pattern '.*'
 353
 354    It then compiles the regex and stores it in the opcode, for
 355    later use by fr30_cgen_assemble_insn
 356
 357    Returns NULL for success, an error message for failure.  */
 358
 359 char *
 360 fr30_cgen_build_insn_regex (insn)
 361      CGEN_INSN *insn;
 362 {
 363   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 364   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 365   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 366   char *rx = rxbuf;
 367   const CGEN_SYNTAX_CHAR_TYPE *syn;
 368   int reg_err;
 369
 370   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 371
 372   /* Mnemonics come first in the syntax string.  */
 373   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 374     return _("missing mnemonic in syntax string");
 375   ++syn;
 376
 377   /* Generate a case sensitive regular expression that emulates case
 378      insensitive matching in the "C" locale.  We cannot generate a case
 379      insensitive regular expression because in Turkish locales, 'i' and 'I'
 380      are not equal modulo case conversion.  */
 381
 382   /* Copy the literal mnemonic out of the insn.  */
 383   for (; *mnem; mnem++)
 384     {
 385       char c = *mnem;
 386
 387       if (ISALPHA (c))
 388         {
 389           *rx++ = '[';
 390           *rx++ = TOLOWER (c);
 391           *rx++ = TOUPPER (c);
 392           *rx++ = ']';
 393         }
 394       else
 395         *rx++ = c;
 396     }
 397
 398   /* Copy any remaining literals from the syntax string into the rx.  */
 399   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 400     {
 401       if (CGEN_SYNTAX_CHAR_P (* syn))
 402         {
 403           char c = CGEN_SYNTAX_CHAR (* syn);
 404
 405           switch (c)
 406             {
 407               /* Escape any regex metacharacters in the syntax.  */
 408             case '.': case '[': case '\\':
 409             case '*': case '^': case '$':
 410
 411 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 412             case '?': case '{': case '}':
 413             case '(': case ')': case '*':
 414             case '|': case '+': case ']':
 415 #endif
 416               *rx++ = '\\';
 417               *rx++ = c;
 418               break;
 419
 420             default:
 421               if (ISALPHA (c))
 422                 {
 423                   *rx++ = '[';
 424                   *rx++ = TOLOWER (c);
 425                   *rx++ = TOUPPER (c);
 426                   *rx++ = ']';
 427                 }
 428               else
 429                 *rx++ = c;
 430               break;
 431             }
 432         }
 433       else
 434         {
 435           /* Replace non-syntax fields with globs.  */
 436           *rx++ = '.';
 437           *rx++ = '*';
 438         }
 439     }
 440
 441   /* Trailing whitespace ok.  */
 442   * rx++ = '[';
 443   * rx++ = ' ';
 444   * rx++ = '\t';
 445   * rx++ = ']';
 446   * rx++ = '*';
 447
 448   /* But anchor it after that.  */
 449   * rx++ = '$';
 450   * rx = '\0';
 451
 452   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 453   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 454
 455   if (reg_err == 0)
 456     return NULL;
 457   else
 458     {
 459       static char msg[80];
 460
 461       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 462       regfree ((regex_t *) CGEN_INSN_RX (insn));
 463       free (CGEN_INSN_RX (insn));
 464       (CGEN_INSN_RX (insn)) = NULL;
 465       return msg;
 466     }
 467 }
 468
 469 \f
 470 /* Default insn parser.
 471
 472    The syntax string is scanned and operands are parsed and stored in FIELDS.
 473    Relocs are queued as we go via other callbacks.
 474
 475    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 476    parse the instruction, we return 0 and the caller will start over from
 477    the beginning.  Backtracking will be necessary in parsing subexpressions,
 478    but that can be handled there.  Not handling backtracking here may get
 479    expensive in the case of the m68k.  Deal with later.
 480
 481    Returns NULL for success, an error message for failure.  */
 482
 483 static const char *
 484 parse_insn_normal (cd, insn, strp, fields)
 485      CGEN_CPU_DESC cd;
 486      const CGEN_INSN *insn;
 487      const char **strp;
 488      CGEN_FIELDS *fields;
 489 {
 490   /* ??? Runtime added insns not handled yet.  */
 491   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 492   const char *str = *strp;
 493   const char *errmsg;
 494   const char *p;
 495   const CGEN_SYNTAX_CHAR_TYPE * syn;
 496 #ifdef CGEN_MNEMONIC_OPERANDS
 497   /* FIXME: wip */
 498   int past_opcode_p;
 499 #endif
 500
 501   /* For now we assume the mnemonic is first (there are no leading operands).
 502      We can parse it without needing to set up operand parsing.
 503      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 504      not be called from GAS.  */
 505   p = CGEN_INSN_MNEMONIC (insn);
 506   while (*p && TOLOWER (*p) == TOLOWER (*str))
 507     ++p, ++str;
 508
 509   if (* p)
 510     return _("unrecognized instruction");
 511
 512 #ifndef CGEN_MNEMONIC_OPERANDS
 513   if (* str && ! ISSPACE (* str))
 514     return _("unrecognized instruction");
 515 #endif
 516
 517   CGEN_INIT_PARSE (cd);
 518   cgen_init_parse_operand (cd);
 519 #ifdef CGEN_MNEMONIC_OPERANDS
 520   past_opcode_p = 0;
 521 #endif
 522
 523   /* We don't check for (*str != '\0') here because we want to parse
 524      any trailing fake arguments in the syntax string.  */
 525   syn = CGEN_SYNTAX_STRING (syntax);
 526
 527   /* Mnemonics come first for now, ensure valid string.  */
 528   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 529     abort ();
 530
 531   ++syn;
 532
 533   while (* syn != 0)
 534     {
 535       /* Non operand chars must match exactly.  */
 536       if (CGEN_SYNTAX_CHAR_P (* syn))
 537         {
 538           /* FIXME: While we allow for non-GAS callers above, we assume the
 539              first char after the mnemonic part is a space.  */
 540           /* FIXME: We also take inappropriate advantage of the fact that
 541              GAS's input scrubber will remove extraneous blanks.  */
 542           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 543             {
 544 #ifdef CGEN_MNEMONIC_OPERANDS
 545               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 546                 past_opcode_p = 1;
 547 #endif
 548               ++ syn;
 549               ++ str;
 550             }
 551           else if (*str)
 552             {
 553               /* Syntax char didn't match.  Can't be this insn.  */
 554               static char msg [80];
 555
 556               /* xgettext:c-format */
 557               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 558                        CGEN_SYNTAX_CHAR(*syn), *str);
 559               return msg;
 560             }
 561           else
 562             {
 563               /* Ran out of input.  */
 564               static char msg [80];
 565
 566               /* xgettext:c-format */
 567               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 568                        CGEN_SYNTAX_CHAR(*syn));
 569               return msg;
 570             }
 571           continue;
 572         }
 573
 574       /* We have an operand of some sort.  */
 575       errmsg = fr30_cgen_parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 576                                           &str, fields);
 577       if (errmsg)
 578         return errmsg;
 579
 580       /* Done with this operand, continue with next one.  */
 581       ++ syn;
 582     }
 583
 584   /* If we're at the end of the syntax string, we're done.  */
 585   if (* syn == 0)
 586     {
 587       /* FIXME: For the moment we assume a valid `str' can only contain
 588          blanks now.  IE: We needn't try again with a longer version of
 589          the insn and it is assumed that longer versions of insns appear
 590          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 591       while (ISSPACE (* str))
 592         ++ str;
 593
 594       if (* str != '\0')
 595         return _("junk at end of line"); /* FIXME: would like to include `str' */
 596
 597       return NULL;
 598     }
 599
 600   /* We couldn't parse it.  */
 601   return _("unrecognized instruction");
 602 }
 603 \f
 604 /* Main entry point.
 605    This routine is called for each instruction to be assembled.
 606    STR points to the insn to be assembled.
 607    We assume all necessary tables have been initialized.
 608    The assembled instruction, less any fixups, is stored in BUF.
 609    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 610    still needs to be converted to target byte order, otherwise BUF is an array
 611    of bytes in target byte order.
 612    The result is a pointer to the insn's entry in the opcode table,
 613    or NULL if an error occured (an error message will have already been
 614    printed).
 615
 616    Note that when processing (non-alias) macro-insns,
 617    this function recurses.
 618
 619    ??? It's possible to make this cpu-independent.
 620    One would have to deal with a few minor things.
 621    At this point in time doing so would be more of a curiosity than useful
 622    [for example this file isn't _that_ big], but keeping the possibility in
 623    mind helps keep the design clean.  */
 624
 625 const CGEN_INSN *
 626 fr30_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 627      CGEN_CPU_DESC cd;
 628      const char *str;
 629      CGEN_FIELDS *fields;
 630      CGEN_INSN_BYTES_PTR buf;
 631      char **errmsg;
 632 {
 633   const char *start;
 634   CGEN_INSN_LIST *ilist;
 635   const char *parse_errmsg = NULL;
 636   const char *insert_errmsg = NULL;
 637   int recognized_mnemonic = 0;
 638
 639   /* Skip leading white space.  */
 640   while (ISSPACE (* str))
 641     ++ str;
 642
 643   /* The instructions are stored in hashed lists.
 644      Get the first in the list.  */
 645   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 646
 647   /* Keep looking until we find a match.  */
 648   start = str;
 649   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 650     {
 651       const CGEN_INSN *insn = ilist->insn;
 652       recognized_mnemonic = 1;
 653
 654 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 655       /* Not usually needed as unsupported opcodes
 656          shouldn't be in the hash lists.  */
 657       /* Is this insn supported by the selected cpu?  */
 658       if (! fr30_cgen_insn_supported (cd, insn))
 659         continue;
 660 #endif
 661       /* If the RELAX attribute is set, this is an insn that shouldn't be
 662          chosen immediately.  Instead, it is used during assembler/linker
 663          relaxation if possible.  */
 664       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
 665         continue;
 666
 667       str = start;
 668
 669       /* Skip this insn if str doesn't look right lexically.  */
 670       if (CGEN_INSN_RX (insn) != NULL &&
 671           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 672         continue;
 673
 674       /* Allow parse/insert handlers to obtain length of insn.  */
 675       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 676
 677       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 678       if (parse_errmsg != NULL)
 679         continue;
 680
 681       /* ??? 0 is passed for `pc'.  */
 682       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 683                                                  (bfd_vma) 0);
 684       if (insert_errmsg != NULL)
 685         continue;
 686
 687       /* It is up to the caller to actually output the insn and any
 688          queued relocs.  */
 689       return insn;
 690     }
 691
 692   {
 693     static char errbuf[150];
 694 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 695     const char *tmp_errmsg;
 696
 697     /* If requesting verbose error messages, use insert_errmsg.
 698        Failing that, use parse_errmsg.  */
 699     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 700                   parse_errmsg ? parse_errmsg :
 701                   recognized_mnemonic ?
 702                   _("unrecognized form of instruction") :
 703                   _("unrecognized instruction"));
 704
 705     if (strlen (start) > 50)
 706       /* xgettext:c-format */
 707       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 708     else
 709       /* xgettext:c-format */
 710       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 711 #else
 712     if (strlen (start) > 50)
 713       /* xgettext:c-format */
 714       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 715     else
 716       /* xgettext:c-format */
 717       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 718 #endif
 719
 720     *errmsg = errbuf;
 721     return NULL;
 722   }
 723 }
 724 \f
 725 #if 0 /* This calls back to GAS which we can't do without care.  */
 726
 727 /* Record each member of OPVALS in the assembler's symbol table.
 728    This lets GAS parse registers for us.
 729    ??? Interesting idea but not currently used.  */
 730
 731 /* Record each member of OPVALS in the assembler's symbol table.
 732    FIXME: Not currently used.  */
 733
 734 void
 735 fr30_cgen_asm_hash_keywords (cd, opvals)
 736      CGEN_CPU_DESC cd;
 737      CGEN_KEYWORD *opvals;
 738 {
 739   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 740   const CGEN_KEYWORD_ENTRY * ke;
 741
 742   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 743     {
 744 #if 0 /* Unnecessary, should be done in the search routine.  */
 745       if (! fr30_cgen_opval_supported (ke))
 746         continue;
 747 #endif
 748       cgen_asm_record_register (cd, ke->name, ke->value);
 749     }
 750 }
 751
 752 #endif /* 0 */