opcodes/lm32-asm.c

   1 /* DO NOT EDIT!  -*- buffer-read-only: t -*- vi:set ro:  */
   2 /* Assembler interface for targets using CGEN. -*- C -*-
   3    CGEN: Cpu tools GENerator
   4
   5    THIS FILE IS MACHINE GENERATED WITH CGEN.
   6    - the resultant file is machine generated, cgen-asm.in isn't
   7
   8    Copyright (C) 1996-2019 Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26
  27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  28    Keep that in mind.  */
  29
  30 #include "sysdep.h"
  31 #include <stdio.h>
  32 #include "ansidecl.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "lm32-desc.h"
  36 #include "lm32-opc.h"
  37 #include "opintl.h"
  38 #include "xregex.h"
  39 #include "libiberty.h"
  40 #include "safe-ctype.h"
  41
  42 #undef  min
  43 #define min(a,b) ((a) < (b) ? (a) : (b))
  44 #undef  max
  45 #define max(a,b) ((a) > (b) ? (a) : (b))
  46
  47 static const char * parse_insn_normal
  48   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  49 \f
  50 /* -- assembler routines inserted here.  */
  51
  52 /* -- asm.c */
  53
  54 /* Handle signed/unsigned literal.  */
  55
  56 static const char *
  57 parse_imm (CGEN_CPU_DESC cd,
  58            const char **strp,
  59            int opindex,
  60            unsigned long *valuep)
  61 {
  62   const char *errmsg;
  63   signed long value;
  64
  65   errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
  66   if (errmsg == NULL)
  67     {
  68       unsigned long x = value & 0xFFFF0000;
  69       if (x != 0 && x != 0xFFFF0000)
  70         errmsg = _("immediate value out of range");
  71       else
  72         *valuep = (value & 0xFFFF);
  73     }
  74   return errmsg;
  75 }
  76
  77 /* Handle hi() */
  78
  79 static const char *
  80 parse_hi16 (CGEN_CPU_DESC cd,
  81             const char **strp,
  82             int opindex,
  83             unsigned long *valuep)
  84 {
  85   if (strncasecmp (*strp, "hi(", 3) == 0)
  86     {
  87       enum cgen_parse_operand_result result_type;
  88       bfd_vma value;
  89       const char *errmsg;
  90
  91       *strp += 3;
  92       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
  93                                    &result_type, &value);
  94       if (**strp != ')')
  95         return _("missing `)'");
  96
  97       ++*strp;
  98       if (errmsg == NULL
  99           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 100         value = (value >> 16) & 0xffff;
 101       *valuep = value;
 102
 103       return errmsg;
 104     }
 105
 106   return parse_imm (cd, strp, opindex, valuep);
 107 }
 108
 109 /* Handle lo() */
 110
 111 static const char *
 112 parse_lo16 (CGEN_CPU_DESC cd,
 113             const char **strp,
 114             int opindex,
 115             unsigned long *valuep)
 116 {
 117   if (strncasecmp (*strp, "lo(", 3) == 0)
 118     {
 119       const char *errmsg;
 120       enum cgen_parse_operand_result result_type;
 121       bfd_vma value;
 122
 123       *strp += 3;
 124       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 125                                    &result_type, &value);
 126       if (**strp != ')')
 127         return _("missing `)'");
 128       ++*strp;
 129       if (errmsg == NULL
 130           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 131         value &= 0xffff;
 132       *valuep = value;
 133       return errmsg;
 134     }
 135
 136   return parse_imm (cd, strp, opindex, valuep);
 137 }
 138
 139 /* Handle gp() */
 140
 141 static const char *
 142 parse_gp16 (CGEN_CPU_DESC cd,
 143             const char **strp,
 144             int opindex,
 145             long *valuep)
 146 {
 147   if (strncasecmp (*strp, "gp(", 3) == 0)
 148     {
 149       const char *errmsg;
 150       enum cgen_parse_operand_result result_type;
 151       bfd_vma value;
 152
 153       *strp += 3;
 154       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_GPREL16,
 155                                    & result_type, & value);
 156       if (**strp != ')')
 157         return _("missing `)'");
 158       ++*strp;
 159       if (errmsg == NULL
 160           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 161         value &= 0xffff;
 162       *valuep = value;
 163       return errmsg;
 164     }
 165
 166   return _("expecting gp relative address: gp(symbol)");
 167 }
 168
 169 /* Handle got() */
 170
 171 static const char *
 172 parse_got16 (CGEN_CPU_DESC cd,
 173              const char **strp,
 174              int opindex,
 175              long *valuep)
 176 {
 177   if (strncasecmp (*strp, "got(", 4) == 0)
 178     {
 179       const char *errmsg;
 180       enum cgen_parse_operand_result result_type;
 181       bfd_vma value;
 182
 183       *strp += 4;
 184       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_16_GOT,
 185                                    & result_type, & value);
 186       if (**strp != ')')
 187         return _("missing `)'");
 188       ++*strp;
 189       if (errmsg == NULL
 190           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 191         value &= 0xffff;
 192       *valuep = value;
 193       return errmsg;
 194     }
 195
 196   return _("expecting got relative address: got(symbol)");
 197 }
 198
 199 /* Handle gotoffhi16() */
 200
 201 static const char *
 202 parse_gotoff_hi16 (CGEN_CPU_DESC cd,
 203                    const char **strp,
 204                    int opindex,
 205                    long *valuep)
 206 {
 207   if (strncasecmp (*strp, "gotoffhi16(", 11) == 0)
 208     {
 209       const char *errmsg;
 210       enum cgen_parse_operand_result result_type;
 211       bfd_vma value;
 212
 213       *strp += 11;
 214       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_GOTOFF_HI16,
 215                                    & result_type, & value);
 216       if (**strp != ')')
 217         return _("missing `)'");
 218       ++*strp;
 219       if (errmsg == NULL
 220           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 221         value &= 0xffff;
 222       *valuep = value;
 223       return errmsg;
 224     }
 225
 226   return _("expecting got relative address: gotoffhi16(symbol)");
 227 }
 228
 229 /* Handle gotofflo16() */
 230
 231 static const char *
 232 parse_gotoff_lo16 (CGEN_CPU_DESC cd,
 233                    const char **strp,
 234                    int opindex,
 235                    long *valuep)
 236 {
 237   if (strncasecmp (*strp, "gotofflo16(", 11) == 0)
 238     {
 239       const char *errmsg;
 240       enum cgen_parse_operand_result result_type;
 241       bfd_vma value;
 242
 243       *strp += 11;
 244       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LM32_GOTOFF_LO16,
 245                                    &result_type, &value);
 246       if (**strp != ')')
 247         return _("missing `)'");
 248       ++*strp;
 249       if (errmsg == NULL
 250           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 251         value &= 0xffff;
 252       *valuep = value;
 253       return errmsg;
 254     }
 255
 256   return _("expecting got relative address: gotofflo16(symbol)");
 257 }
 258
 259 const char * lm32_cgen_parse_operand
 260   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 261
 262 /* Main entry point for operand parsing.
 263
 264    This function is basically just a big switch statement.  Earlier versions
 265    used tables to look up the function to use, but
 266    - if the table contains both assembler and disassembler functions then
 267      the disassembler contains much of the assembler and vice-versa,
 268    - there's a lot of inlining possibilities as things grow,
 269    - using a switch statement avoids the function call overhead.
 270
 271    This function could be moved into `parse_insn_normal', but keeping it
 272    separate makes clear the interface between `parse_insn_normal' and each of
 273    the handlers.  */
 274
 275 const char *
 276 lm32_cgen_parse_operand (CGEN_CPU_DESC cd,
 277                            int opindex,
 278                            const char ** strp,
 279                            CGEN_FIELDS * fields)
 280 {
 281   const char * errmsg = NULL;
 282   /* Used by scalar operands that still need to be parsed.  */
 283   long junk ATTRIBUTE_UNUSED;
 284
 285   switch (opindex)
 286     {
 287     case LM32_OPERAND_BRANCH :
 288       {
 289         bfd_vma value = 0;
 290         errmsg = cgen_parse_address (cd, strp, LM32_OPERAND_BRANCH, 0, NULL,  & value);
 291         fields->f_branch = value;
 292       }
 293       break;
 294     case LM32_OPERAND_CALL :
 295       {
 296         bfd_vma value = 0;
 297         errmsg = cgen_parse_address (cd, strp, LM32_OPERAND_CALL, 0, NULL,  & value);
 298         fields->f_call = value;
 299       }
 300       break;
 301     case LM32_OPERAND_CSR :
 302       errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_csr, & fields->f_csr);
 303       break;
 304     case LM32_OPERAND_EXCEPTION :
 305       errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_EXCEPTION, (unsigned long *) (& fields->f_exception));
 306       break;
 307     case LM32_OPERAND_GOT16 :
 308       errmsg = parse_got16 (cd, strp, LM32_OPERAND_GOT16, (long *) (& fields->f_imm));
 309       break;
 310     case LM32_OPERAND_GOTOFFHI16 :
 311       errmsg = parse_gotoff_hi16 (cd, strp, LM32_OPERAND_GOTOFFHI16, (long *) (& fields->f_imm));
 312       break;
 313     case LM32_OPERAND_GOTOFFLO16 :
 314       errmsg = parse_gotoff_lo16 (cd, strp, LM32_OPERAND_GOTOFFLO16, (long *) (& fields->f_imm));
 315       break;
 316     case LM32_OPERAND_GP16 :
 317       errmsg = parse_gp16 (cd, strp, LM32_OPERAND_GP16, (long *) (& fields->f_imm));
 318       break;
 319     case LM32_OPERAND_HI16 :
 320       errmsg = parse_hi16 (cd, strp, LM32_OPERAND_HI16, (unsigned long *) (& fields->f_uimm));
 321       break;
 322     case LM32_OPERAND_IMM :
 323       errmsg = cgen_parse_signed_integer (cd, strp, LM32_OPERAND_IMM, (long *) (& fields->f_imm));
 324       break;
 325     case LM32_OPERAND_LO16 :
 326       errmsg = parse_lo16 (cd, strp, LM32_OPERAND_LO16, (unsigned long *) (& fields->f_uimm));
 327       break;
 328     case LM32_OPERAND_R0 :
 329       errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r0);
 330       break;
 331     case LM32_OPERAND_R1 :
 332       errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r1);
 333       break;
 334     case LM32_OPERAND_R2 :
 335       errmsg = cgen_parse_keyword (cd, strp, & lm32_cgen_opval_h_gr, & fields->f_r2);
 336       break;
 337     case LM32_OPERAND_SHIFT :
 338       errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_SHIFT, (unsigned long *) (& fields->f_shift));
 339       break;
 340     case LM32_OPERAND_UIMM :
 341       errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_UIMM, (unsigned long *) (& fields->f_uimm));
 342       break;
 343     case LM32_OPERAND_USER :
 344       errmsg = cgen_parse_unsigned_integer (cd, strp, LM32_OPERAND_USER, (unsigned long *) (& fields->f_user));
 345       break;
 346
 347     default :
 348       /* xgettext:c-format */
 349       opcodes_error_handler
 350         (_("internal error: unrecognized field %d while parsing"),
 351          opindex);
 352       abort ();
 353   }
 354
 355   return errmsg;
 356 }
 357
 358 cgen_parse_fn * const lm32_cgen_parse_handlers[] =
 359 {
 360   parse_insn_normal,
 361 };
 362
 363 void
 364 lm32_cgen_init_asm (CGEN_CPU_DESC cd)
 365 {
 366   lm32_cgen_init_opcode_table (cd);
 367   lm32_cgen_init_ibld_table (cd);
 368   cd->parse_handlers = & lm32_cgen_parse_handlers[0];
 369   cd->parse_operand = lm32_cgen_parse_operand;
 370 #ifdef CGEN_ASM_INIT_HOOK
 371 CGEN_ASM_INIT_HOOK
 372 #endif
 373 }
 374
 375 \f
 376
 377 /* Regex construction routine.
 378
 379    This translates an opcode syntax string into a regex string,
 380    by replacing any non-character syntax element (such as an
 381    opcode) with the pattern '.*'
 382
 383    It then compiles the regex and stores it in the opcode, for
 384    later use by lm32_cgen_assemble_insn
 385
 386    Returns NULL for success, an error message for failure.  */
 387
 388 char *
 389 lm32_cgen_build_insn_regex (CGEN_INSN *insn)
 390 {
 391   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 392   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 393   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 394   char *rx = rxbuf;
 395   const CGEN_SYNTAX_CHAR_TYPE *syn;
 396   int reg_err;
 397
 398   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 399
 400   /* Mnemonics come first in the syntax string.  */
 401   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 402     return _("missing mnemonic in syntax string");
 403   ++syn;
 404
 405   /* Generate a case sensitive regular expression that emulates case
 406      insensitive matching in the "C" locale.  We cannot generate a case
 407      insensitive regular expression because in Turkish locales, 'i' and 'I'
 408      are not equal modulo case conversion.  */
 409
 410   /* Copy the literal mnemonic out of the insn.  */
 411   for (; *mnem; mnem++)
 412     {
 413       char c = *mnem;
 414
 415       if (ISALPHA (c))
 416         {
 417           *rx++ = '[';
 418           *rx++ = TOLOWER (c);
 419           *rx++ = TOUPPER (c);
 420           *rx++ = ']';
 421         }
 422       else
 423         *rx++ = c;
 424     }
 425
 426   /* Copy any remaining literals from the syntax string into the rx.  */
 427   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 428     {
 429       if (CGEN_SYNTAX_CHAR_P (* syn))
 430         {
 431           char c = CGEN_SYNTAX_CHAR (* syn);
 432
 433           switch (c)
 434             {
 435               /* Escape any regex metacharacters in the syntax.  */
 436             case '.': case '[': case '\\':
 437             case '*': case '^': case '$':
 438
 439 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 440             case '?': case '{': case '}':
 441             case '(': case ')': case '*':
 442             case '|': case '+': case ']':
 443 #endif
 444               *rx++ = '\\';
 445               *rx++ = c;
 446               break;
 447
 448             default:
 449               if (ISALPHA (c))
 450                 {
 451                   *rx++ = '[';
 452                   *rx++ = TOLOWER (c);
 453                   *rx++ = TOUPPER (c);
 454                   *rx++ = ']';
 455                 }
 456               else
 457                 *rx++ = c;
 458               break;
 459             }
 460         }
 461       else
 462         {
 463           /* Replace non-syntax fields with globs.  */
 464           *rx++ = '.';
 465           *rx++ = '*';
 466         }
 467     }
 468
 469   /* Trailing whitespace ok.  */
 470   * rx++ = '[';
 471   * rx++ = ' ';
 472   * rx++ = '\t';
 473   * rx++ = ']';
 474   * rx++ = '*';
 475
 476   /* But anchor it after that.  */
 477   * rx++ = '$';
 478   * rx = '\0';
 479
 480   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 481   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 482
 483   if (reg_err == 0)
 484     return NULL;
 485   else
 486     {
 487       static char msg[80];
 488
 489       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 490       regfree ((regex_t *) CGEN_INSN_RX (insn));
 491       free (CGEN_INSN_RX (insn));
 492       (CGEN_INSN_RX (insn)) = NULL;
 493       return msg;
 494     }
 495 }
 496
 497 \f
 498 /* Default insn parser.
 499
 500    The syntax string is scanned and operands are parsed and stored in FIELDS.
 501    Relocs are queued as we go via other callbacks.
 502
 503    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 504    parse the instruction, we return 0 and the caller will start over from
 505    the beginning.  Backtracking will be necessary in parsing subexpressions,
 506    but that can be handled there.  Not handling backtracking here may get
 507    expensive in the case of the m68k.  Deal with later.
 508
 509    Returns NULL for success, an error message for failure.  */
 510
 511 static const char *
 512 parse_insn_normal (CGEN_CPU_DESC cd,
 513                    const CGEN_INSN *insn,
 514                    const char **strp,
 515                    CGEN_FIELDS *fields)
 516 {
 517   /* ??? Runtime added insns not handled yet.  */
 518   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 519   const char *str = *strp;
 520   const char *errmsg;
 521   const char *p;
 522   const CGEN_SYNTAX_CHAR_TYPE * syn;
 523 #ifdef CGEN_MNEMONIC_OPERANDS
 524   /* FIXME: wip */
 525   int past_opcode_p;
 526 #endif
 527
 528   /* For now we assume the mnemonic is first (there are no leading operands).
 529      We can parse it without needing to set up operand parsing.
 530      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 531      not be called from GAS.  */
 532   p = CGEN_INSN_MNEMONIC (insn);
 533   while (*p && TOLOWER (*p) == TOLOWER (*str))
 534     ++p, ++str;
 535
 536   if (* p)
 537     return _("unrecognized instruction");
 538
 539 #ifndef CGEN_MNEMONIC_OPERANDS
 540   if (* str && ! ISSPACE (* str))
 541     return _("unrecognized instruction");
 542 #endif
 543
 544   CGEN_INIT_PARSE (cd);
 545   cgen_init_parse_operand (cd);
 546 #ifdef CGEN_MNEMONIC_OPERANDS
 547   past_opcode_p = 0;
 548 #endif
 549
 550   /* We don't check for (*str != '\0') here because we want to parse
 551      any trailing fake arguments in the syntax string.  */
 552   syn = CGEN_SYNTAX_STRING (syntax);
 553
 554   /* Mnemonics come first for now, ensure valid string.  */
 555   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 556     abort ();
 557
 558   ++syn;
 559
 560   while (* syn != 0)
 561     {
 562       /* Non operand chars must match exactly.  */
 563       if (CGEN_SYNTAX_CHAR_P (* syn))
 564         {
 565           /* FIXME: While we allow for non-GAS callers above, we assume the
 566              first char after the mnemonic part is a space.  */
 567           /* FIXME: We also take inappropriate advantage of the fact that
 568              GAS's input scrubber will remove extraneous blanks.  */
 569           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 570             {
 571 #ifdef CGEN_MNEMONIC_OPERANDS
 572               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 573                 past_opcode_p = 1;
 574 #endif
 575               ++ syn;
 576               ++ str;
 577             }
 578           else if (*str)
 579             {
 580               /* Syntax char didn't match.  Can't be this insn.  */
 581               static char msg [80];
 582
 583               /* xgettext:c-format */
 584               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 585                        CGEN_SYNTAX_CHAR(*syn), *str);
 586               return msg;
 587             }
 588           else
 589             {
 590               /* Ran out of input.  */
 591               static char msg [80];
 592
 593               /* xgettext:c-format */
 594               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 595                        CGEN_SYNTAX_CHAR(*syn));
 596               return msg;
 597             }
 598           continue;
 599         }
 600
 601 #ifdef CGEN_MNEMONIC_OPERANDS
 602       (void) past_opcode_p;
 603 #endif
 604       /* We have an operand of some sort.  */
 605       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn), &str, fields);
 606       if (errmsg)
 607         return errmsg;
 608
 609       /* Done with this operand, continue with next one.  */
 610       ++ syn;
 611     }
 612
 613   /* If we're at the end of the syntax string, we're done.  */
 614   if (* syn == 0)
 615     {
 616       /* FIXME: For the moment we assume a valid `str' can only contain
 617          blanks now.  IE: We needn't try again with a longer version of
 618          the insn and it is assumed that longer versions of insns appear
 619          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 620       while (ISSPACE (* str))
 621         ++ str;
 622
 623       if (* str != '\0')
 624         return _("junk at end of line"); /* FIXME: would like to include `str' */
 625
 626       return NULL;
 627     }
 628
 629   /* We couldn't parse it.  */
 630   return _("unrecognized instruction");
 631 }
 632 \f
 633 /* Main entry point.
 634    This routine is called for each instruction to be assembled.
 635    STR points to the insn to be assembled.
 636    We assume all necessary tables have been initialized.
 637    The assembled instruction, less any fixups, is stored in BUF.
 638    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 639    still needs to be converted to target byte order, otherwise BUF is an array
 640    of bytes in target byte order.
 641    The result is a pointer to the insn's entry in the opcode table,
 642    or NULL if an error occured (an error message will have already been
 643    printed).
 644
 645    Note that when processing (non-alias) macro-insns,
 646    this function recurses.
 647
 648    ??? It's possible to make this cpu-independent.
 649    One would have to deal with a few minor things.
 650    At this point in time doing so would be more of a curiosity than useful
 651    [for example this file isn't _that_ big], but keeping the possibility in
 652    mind helps keep the design clean.  */
 653
 654 const CGEN_INSN *
 655 lm32_cgen_assemble_insn (CGEN_CPU_DESC cd,
 656                            const char *str,
 657                            CGEN_FIELDS *fields,
 658                            CGEN_INSN_BYTES_PTR buf,
 659                            char **errmsg)
 660 {
 661   const char *start;
 662   CGEN_INSN_LIST *ilist;
 663   const char *parse_errmsg = NULL;
 664   const char *insert_errmsg = NULL;
 665   int recognized_mnemonic = 0;
 666
 667   /* Skip leading white space.  */
 668   while (ISSPACE (* str))
 669     ++ str;
 670
 671   /* The instructions are stored in hashed lists.
 672      Get the first in the list.  */
 673   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 674
 675   /* Keep looking until we find a match.  */
 676   start = str;
 677   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 678     {
 679       const CGEN_INSN *insn = ilist->insn;
 680       recognized_mnemonic = 1;
 681
 682 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 683       /* Not usually needed as unsupported opcodes
 684          shouldn't be in the hash lists.  */
 685       /* Is this insn supported by the selected cpu?  */
 686       if (! lm32_cgen_insn_supported (cd, insn))
 687         continue;
 688 #endif
 689       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 690          chosen immediately.  Instead, it is used during assembler/linker
 691          relaxation if possible.  */
 692       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 693         continue;
 694
 695       str = start;
 696
 697       /* Skip this insn if str doesn't look right lexically.  */
 698       if (CGEN_INSN_RX (insn) != NULL &&
 699           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 700         continue;
 701
 702       /* Allow parse/insert handlers to obtain length of insn.  */
 703       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 704
 705       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 706       if (parse_errmsg != NULL)
 707         continue;
 708
 709       /* ??? 0 is passed for `pc'.  */
 710       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 711                                                  (bfd_vma) 0);
 712       if (insert_errmsg != NULL)
 713         continue;
 714
 715       /* It is up to the caller to actually output the insn and any
 716          queued relocs.  */
 717       return insn;
 718     }
 719
 720   {
 721     static char errbuf[150];
 722     const char *tmp_errmsg;
 723 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 724 #define be_verbose 1
 725 #else
 726 #define be_verbose 0
 727 #endif
 728
 729     if (be_verbose)
 730       {
 731         /* If requesting verbose error messages, use insert_errmsg.
 732            Failing that, use parse_errmsg.  */
 733         tmp_errmsg = (insert_errmsg ? insert_errmsg :
 734                       parse_errmsg ? parse_errmsg :
 735                       recognized_mnemonic ?
 736                       _("unrecognized form of instruction") :
 737                       _("unrecognized instruction"));
 738
 739         if (strlen (start) > 50)
 740           /* xgettext:c-format */
 741           sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 742         else
 743           /* xgettext:c-format */
 744           sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 745       }
 746     else
 747       {
 748         if (strlen (start) > 50)
 749           /* xgettext:c-format */
 750           sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 751         else
 752           /* xgettext:c-format */
 753           sprintf (errbuf, _("bad instruction `%.50s'"), start);
 754       }
 755
 756     *errmsg = errbuf;
 757     return NULL;
 758   }
 759 }