opcodes/iq2000-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 "iq2000-desc.h"
  34 #include "iq2000-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 static const char * parse_mimm PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
  52 static const char * parse_imm  PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  53 static const char * parse_hi16 PARAMS ((CGEN_CPU_DESC, const char **, int, unsigned long *));
  54 static const char * parse_lo16 PARAMS ((CGEN_CPU_DESC, const char **, int, long *));
  55
  56 /* Special check to ensure that instruction exists for given machine */
  57 int
  58 iq2000_cgen_insn_supported (cd, insn)
  59      CGEN_CPU_DESC cd;
  60      CGEN_INSN *insn;
  61 {
  62   int machs = cd->machs;
  63
  64   return ((CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_MACH) & machs) != 0);
  65 }
  66
  67 static int iq2000_cgen_isa_register (strp)
  68      const char **strp;
  69 {
  70   int len;
  71   int ch1, ch2;
  72   if (**strp == 'r' || **strp == 'R')
  73     {
  74       len = strlen (*strp);
  75       if (len == 2)
  76         {
  77           ch1 = (*strp)[1];
  78           if ('0' <= ch1 && ch1 <= '9')
  79             return 1;
  80         }
  81       else if (len == 3)
  82         {
  83           ch1 = (*strp)[1];
  84           ch2 = (*strp)[2];
  85           if (('1' <= ch1 && ch1 <= '2') && ('0' <= ch2 && ch2 <= '9'))
  86             return 1;
  87           if ('3' == ch1 && (ch2 == '0' || ch2 == '1'))
  88             return 1;
  89         }
  90     }
  91   if (**strp == '%' && tolower((*strp)[1]) != 'l' && tolower((*strp)[1]) != 'h')
  92     return 1;
  93   return 0;
  94 }
  95
  96 /* Handle negated literal.  */
  97
  98 static const char *
  99 parse_mimm (cd, strp, opindex, valuep)
 100      CGEN_CPU_DESC cd;
 101      const char **strp;
 102      int opindex;
 103      long *valuep;
 104 {
 105   const char *errmsg;
 106   long value;
 107
 108   /* Verify this isn't a register */
 109   if (iq2000_cgen_isa_register (strp))
 110     errmsg = _("immediate value cannot be register");
 111   else
 112     {
 113       long value;
 114
 115       errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
 116       if (errmsg == NULL)
 117         {
 118           long x = (-value) & 0xFFFF0000;
 119           if (x != 0 && x != 0xFFFF0000)
 120             errmsg = _("immediate value out of range");
 121           else
 122             *valuep = (-value & 0xFFFF);
 123         }
 124     }
 125   return errmsg;
 126 }
 127
 128 /* Handle signed/unsigned literal.  */
 129
 130 static const char *
 131 parse_imm (cd, strp, opindex, valuep)
 132      CGEN_CPU_DESC cd;
 133      const char **strp;
 134      int opindex;
 135      unsigned long *valuep;
 136 {
 137   const char *errmsg;
 138   long value;
 139
 140   if (iq2000_cgen_isa_register (strp))
 141     errmsg = _("immediate value cannot be register");
 142   else
 143     {
 144       long value;
 145
 146       errmsg = cgen_parse_signed_integer (cd, strp, opindex, & value);
 147       if (errmsg == NULL)
 148         {
 149           long x = value & 0xFFFF0000;
 150           if (x != 0 && x != 0xFFFF0000)
 151             errmsg = _("immediate value out of range");
 152           else
 153             *valuep = (value & 0xFFFF);
 154         }
 155     }
 156   return errmsg;
 157 }
 158
 159 /* Handle iq10 21-bit jmp offset.  */
 160
 161 static const char *
 162 parse_jtargq10 (cd, strp, opindex, reloc, type_addr, valuep)
 163      CGEN_CPU_DESC cd;
 164      const char **strp;
 165      int opindex;
 166      int reloc;
 167      enum cgen_parse_operand_result *type_addr;
 168      unsigned long *valuep;
 169 {
 170   const char *errmsg;
 171   bfd_vma value;
 172   enum cgen_parse_operand_result result_type = CGEN_PARSE_OPERAND_RESULT_NUMBER;
 173
 174   errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_OFFSET_21,
 175                                &result_type, &value);
 176   if (errmsg == NULL && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 177     {
 178       /* check value is within 23-bits (remembering that 2-bit shift right will occur) */
 179       if (value > 0x7fffff)
 180         return _("21-bit offset out of range");
 181     }
 182   *valuep = (value & 0x7FFFFF);
 183   return errmsg;
 184 }
 185
 186 /* Handle high().  */
 187
 188 static const char *
 189 parse_hi16 (cd, strp, opindex, valuep)
 190      CGEN_CPU_DESC cd;
 191      const char **strp;
 192      int opindex;
 193      unsigned long *valuep;
 194 {
 195   if (strncasecmp (*strp, "%hi(", 4) == 0)
 196     {
 197       enum cgen_parse_operand_result result_type;
 198       bfd_vma value;
 199       const char *errmsg;
 200
 201       *strp += 4;
 202       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
 203                                    &result_type, &value);
 204       if (**strp != ')')
 205         return _("missing `)'");
 206
 207       ++*strp;
 208       if (errmsg == NULL
 209           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 210         {
 211           /* if value has top-bit of %lo on, then it will
 212              sign-propagate and so we compensate by adding
 213              1 to the resultant %hi value */
 214           if (value & 0x8000)
 215             value += 0x10000;
 216           value >>= 16;
 217         }
 218       *valuep = value;
 219
 220       return errmsg;
 221     }
 222
 223   /* we add %uhi in case a user just wants the high 16-bits or is using
 224      an insn like ori for %lo which does not sign-propagate */
 225   if (strncasecmp (*strp, "%uhi(", 5) == 0)
 226     {
 227       enum cgen_parse_operand_result result_type;
 228       bfd_vma value;
 229       const char *errmsg;
 230
 231       *strp += 5;
 232       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IQ2000_UHI16,
 233                                    &result_type, &value);
 234       if (**strp != ')')
 235         return _("missing `)'");
 236
 237       ++*strp;
 238       if (errmsg == NULL
 239           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 240         {
 241           value >>= 16;
 242         }
 243       *valuep = value;
 244
 245       return errmsg;
 246     }
 247
 248   return parse_imm (cd, strp, opindex, valuep);
 249 }
 250
 251 /* Handle %lo in a signed context.
 252    The signedness of the value doesn't matter to %lo(), but this also
 253    handles the case where %lo() isn't present.  */
 254
 255 static const char *
 256 parse_lo16 (cd, strp, opindex, valuep)
 257      CGEN_CPU_DESC cd;
 258      const char **strp;
 259      int opindex;
 260      long *valuep;
 261 {
 262   if (strncasecmp (*strp, "%lo(", 4) == 0)
 263     {
 264       const char *errmsg;
 265       enum cgen_parse_operand_result result_type;
 266       bfd_vma value;
 267
 268       *strp += 4;
 269       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 270                                    &result_type, &value);
 271       if (**strp != ')')
 272         return _("missing `)'");
 273       ++*strp;
 274       if (errmsg == NULL
 275           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 276         value &= 0xffff;
 277       *valuep = value;
 278       return errmsg;
 279     }
 280
 281   return parse_imm (cd, strp, opindex, valuep);
 282 }
 283
 284 /* Handle %lo in a negated signed context.
 285    The signedness of the value doesn't matter to %lo(), but this also
 286    handles the case where %lo() isn't present.  */
 287
 288 static const char *
 289 parse_mlo16 (cd, strp, opindex, valuep)
 290      CGEN_CPU_DESC cd;
 291      const char **strp;
 292      int opindex;
 293      long *valuep;
 294 {
 295   if (strncasecmp (*strp, "%lo(", 4) == 0)
 296     {
 297       const char *errmsg;
 298       enum cgen_parse_operand_result result_type;
 299       bfd_vma value;
 300
 301       *strp += 4;
 302       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 303                                    &result_type, &value);
 304       if (**strp != ')')
 305         return _("missing `)'");
 306       ++*strp;
 307       if (errmsg == NULL
 308           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 309         value = (-value) & 0xffff;
 310       *valuep = value;
 311       return errmsg;
 312     }
 313
 314   return parse_mimm (cd, strp, opindex, valuep);
 315 }
 316
 317 /* -- */
 318
 319 const char * iq2000_cgen_parse_operand
 320   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 321
 322 /* Main entry point for operand parsing.
 323
 324    This function is basically just a big switch statement.  Earlier versions
 325    used tables to look up the function to use, but
 326    - if the table contains both assembler and disassembler functions then
 327      the disassembler contains much of the assembler and vice-versa,
 328    - there's a lot of inlining possibilities as things grow,
 329    - using a switch statement avoids the function call overhead.
 330
 331    This function could be moved into `parse_insn_normal', but keeping it
 332    separate makes clear the interface between `parse_insn_normal' and each of
 333    the handlers.  */
 334
 335 const char *
 336 iq2000_cgen_parse_operand (cd, opindex, strp, fields)
 337      CGEN_CPU_DESC cd;
 338      int opindex;
 339      const char ** strp;
 340      CGEN_FIELDS * fields;
 341 {
 342   const char * errmsg = NULL;
 343   /* Used by scalar operands that still need to be parsed.  */
 344   long junk ATTRIBUTE_UNUSED;
 345
 346   switch (opindex)
 347     {
 348     case IQ2000_OPERAND_BASE :
 349       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);
 350       break;
 351     case IQ2000_OPERAND_BASEOFF :
 352       {
 353         bfd_vma value;
 354         errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_BASEOFF, 0, NULL,  & value);
 355         fields->f_imm = value;
 356       }
 357       break;
 358     case IQ2000_OPERAND_BITNUM :
 359       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BITNUM, &fields->f_rt);
 360       break;
 361     case IQ2000_OPERAND_BYTECOUNT :
 362       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_BYTECOUNT, &fields->f_bytecount);
 363       break;
 364     case IQ2000_OPERAND_CAM_Y :
 365       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Y, &fields->f_cam_y);
 366       break;
 367     case IQ2000_OPERAND_CAM_Z :
 368       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CAM_Z, &fields->f_cam_z);
 369       break;
 370     case IQ2000_OPERAND_CM_3FUNC :
 371       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3FUNC, &fields->f_cm_3func);
 372       break;
 373     case IQ2000_OPERAND_CM_3Z :
 374       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_3Z, &fields->f_cm_3z);
 375       break;
 376     case IQ2000_OPERAND_CM_4FUNC :
 377       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4FUNC, &fields->f_cm_4func);
 378       break;
 379     case IQ2000_OPERAND_CM_4Z :
 380       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_CM_4Z, &fields->f_cm_4z);
 381       break;
 382     case IQ2000_OPERAND_COUNT :
 383       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_COUNT, &fields->f_count);
 384       break;
 385     case IQ2000_OPERAND_EXECODE :
 386       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_EXECODE, &fields->f_excode);
 387       break;
 388     case IQ2000_OPERAND_HI16 :
 389       errmsg = parse_hi16 (cd, strp, IQ2000_OPERAND_HI16, &fields->f_imm);
 390       break;
 391     case IQ2000_OPERAND_IMM :
 392       errmsg = parse_imm (cd, strp, IQ2000_OPERAND_IMM, &fields->f_imm);
 393       break;
 394     case IQ2000_OPERAND_INDEX :
 395       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_INDEX, &fields->f_index);
 396       break;
 397     case IQ2000_OPERAND_JMPTARG :
 398       {
 399         bfd_vma value;
 400         errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_JMPTARG, 0, NULL,  & value);
 401         fields->f_jtarg = value;
 402       }
 403       break;
 404     case IQ2000_OPERAND_JMPTARGQ10 :
 405       {
 406         bfd_vma value;
 407         errmsg = parse_jtargq10 (cd, strp, IQ2000_OPERAND_JMPTARGQ10, 0, NULL,  & value);
 408         fields->f_jtargq10 = value;
 409       }
 410       break;
 411     case IQ2000_OPERAND_LO16 :
 412       errmsg = parse_lo16 (cd, strp, IQ2000_OPERAND_LO16, &fields->f_imm);
 413       break;
 414     case IQ2000_OPERAND_MASK :
 415       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASK, &fields->f_mask);
 416       break;
 417     case IQ2000_OPERAND_MASKL :
 418       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKL, &fields->f_maskl);
 419       break;
 420     case IQ2000_OPERAND_MASKQ10 :
 421       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKQ10, &fields->f_maskq10);
 422       break;
 423     case IQ2000_OPERAND_MASKR :
 424       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_MASKR, &fields->f_rs);
 425       break;
 426     case IQ2000_OPERAND_MLO16 :
 427       errmsg = parse_mlo16 (cd, strp, IQ2000_OPERAND_MLO16, &fields->f_imm);
 428       break;
 429     case IQ2000_OPERAND_OFFSET :
 430       {
 431         bfd_vma value;
 432         errmsg = cgen_parse_address (cd, strp, IQ2000_OPERAND_OFFSET, 0, NULL,  & value);
 433         fields->f_offset = value;
 434       }
 435       break;
 436     case IQ2000_OPERAND_RD :
 437       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd);
 438       break;
 439     case IQ2000_OPERAND_RD_RS :
 440       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rs);
 441       break;
 442     case IQ2000_OPERAND_RD_RT :
 443       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rd_rt);
 444       break;
 445     case IQ2000_OPERAND_RS :
 446       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rs);
 447       break;
 448     case IQ2000_OPERAND_RT :
 449       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt);
 450       break;
 451     case IQ2000_OPERAND_RT_RS :
 452       errmsg = cgen_parse_keyword (cd, strp, & iq2000_cgen_opval_gr_names, & fields->f_rt_rs);
 453       break;
 454     case IQ2000_OPERAND_SHAMT :
 455       errmsg = cgen_parse_unsigned_integer (cd, strp, IQ2000_OPERAND_SHAMT, &fields->f_shamt);
 456       break;
 457
 458     default :
 459       /* xgettext:c-format */
 460       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 461       abort ();
 462   }
 463
 464   return errmsg;
 465 }
 466
 467 cgen_parse_fn * const iq2000_cgen_parse_handlers[] =
 468 {
 469   parse_insn_normal,
 470 };
 471
 472 void
 473 iq2000_cgen_init_asm (cd)
 474      CGEN_CPU_DESC cd;
 475 {
 476   iq2000_cgen_init_opcode_table (cd);
 477   iq2000_cgen_init_ibld_table (cd);
 478   cd->parse_handlers = & iq2000_cgen_parse_handlers[0];
 479   cd->parse_operand = iq2000_cgen_parse_operand;
 480 #ifdef CGEN_ASM_INIT_HOOK
 481 CGEN_ASM_INIT_HOOK
 482 #endif
 483 }
 484
 485 \f
 486
 487 /* Regex construction routine.
 488
 489    This translates an opcode syntax string into a regex string,
 490    by replacing any non-character syntax element (such as an
 491    opcode) with the pattern '.*'
 492
 493    It then compiles the regex and stores it in the opcode, for
 494    later use by iq2000_cgen_assemble_insn
 495
 496    Returns NULL for success, an error message for failure.  */
 497
 498 char *
 499 iq2000_cgen_build_insn_regex (insn)
 500      CGEN_INSN *insn;
 501 {
 502   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 503   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 504   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 505   char *rx = rxbuf;
 506   const CGEN_SYNTAX_CHAR_TYPE *syn;
 507   int reg_err;
 508
 509   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 510
 511   /* Mnemonics come first in the syntax string.  */
 512   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 513     return _("missing mnemonic in syntax string");
 514   ++syn;
 515
 516   /* Generate a case sensitive regular expression that emulates case
 517      insensitive matching in the "C" locale.  We cannot generate a case
 518      insensitive regular expression because in Turkish locales, 'i' and 'I'
 519      are not equal modulo case conversion.  */
 520
 521   /* Copy the literal mnemonic out of the insn.  */
 522   for (; *mnem; mnem++)
 523     {
 524       char c = *mnem;
 525
 526       if (ISALPHA (c))
 527         {
 528           *rx++ = '[';
 529           *rx++ = TOLOWER (c);
 530           *rx++ = TOUPPER (c);
 531           *rx++ = ']';
 532         }
 533       else
 534         *rx++ = c;
 535     }
 536
 537   /* Copy any remaining literals from the syntax string into the rx.  */
 538   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 539     {
 540       if (CGEN_SYNTAX_CHAR_P (* syn))
 541         {
 542           char c = CGEN_SYNTAX_CHAR (* syn);
 543
 544           switch (c)
 545             {
 546               /* Escape any regex metacharacters in the syntax.  */
 547             case '.': case '[': case '\\':
 548             case '*': case '^': case '$':
 549
 550 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 551             case '?': case '{': case '}':
 552             case '(': case ')': case '*':
 553             case '|': case '+': case ']':
 554 #endif
 555               *rx++ = '\\';
 556               *rx++ = c;
 557               break;
 558
 559             default:
 560               if (ISALPHA (c))
 561                 {
 562                   *rx++ = '[';
 563                   *rx++ = TOLOWER (c);
 564                   *rx++ = TOUPPER (c);
 565                   *rx++ = ']';
 566                 }
 567               else
 568                 *rx++ = c;
 569               break;
 570             }
 571         }
 572       else
 573         {
 574           /* Replace non-syntax fields with globs.  */
 575           *rx++ = '.';
 576           *rx++ = '*';
 577         }
 578     }
 579
 580   /* Trailing whitespace ok.  */
 581   * rx++ = '[';
 582   * rx++ = ' ';
 583   * rx++ = '\t';
 584   * rx++ = ']';
 585   * rx++ = '*';
 586
 587   /* But anchor it after that.  */
 588   * rx++ = '$';
 589   * rx = '\0';
 590
 591   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 592   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 593
 594   if (reg_err == 0)
 595     return NULL;
 596   else
 597     {
 598       static char msg[80];
 599
 600       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 601       regfree ((regex_t *) CGEN_INSN_RX (insn));
 602       free (CGEN_INSN_RX (insn));
 603       (CGEN_INSN_RX (insn)) = NULL;
 604       return msg;
 605     }
 606 }
 607
 608 \f
 609 /* Default insn parser.
 610
 611    The syntax string is scanned and operands are parsed and stored in FIELDS.
 612    Relocs are queued as we go via other callbacks.
 613
 614    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 615    parse the instruction, we return 0 and the caller will start over from
 616    the beginning.  Backtracking will be necessary in parsing subexpressions,
 617    but that can be handled there.  Not handling backtracking here may get
 618    expensive in the case of the m68k.  Deal with later.
 619
 620    Returns NULL for success, an error message for failure.  */
 621
 622 static const char *
 623 parse_insn_normal (cd, insn, strp, fields)
 624      CGEN_CPU_DESC cd;
 625      const CGEN_INSN *insn;
 626      const char **strp;
 627      CGEN_FIELDS *fields;
 628 {
 629   /* ??? Runtime added insns not handled yet.  */
 630   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 631   const char *str = *strp;
 632   const char *errmsg;
 633   const char *p;
 634   const CGEN_SYNTAX_CHAR_TYPE * syn;
 635 #ifdef CGEN_MNEMONIC_OPERANDS
 636   /* FIXME: wip */
 637   int past_opcode_p;
 638 #endif
 639
 640   /* For now we assume the mnemonic is first (there are no leading operands).
 641      We can parse it without needing to set up operand parsing.
 642      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 643      not be called from GAS.  */
 644   p = CGEN_INSN_MNEMONIC (insn);
 645   while (*p && TOLOWER (*p) == TOLOWER (*str))
 646     ++p, ++str;
 647
 648   if (* p)
 649     return _("unrecognized instruction");
 650
 651 #ifndef CGEN_MNEMONIC_OPERANDS
 652   if (* str && ! ISSPACE (* str))
 653     return _("unrecognized instruction");
 654 #endif
 655
 656   CGEN_INIT_PARSE (cd);
 657   cgen_init_parse_operand (cd);
 658 #ifdef CGEN_MNEMONIC_OPERANDS
 659   past_opcode_p = 0;
 660 #endif
 661
 662   /* We don't check for (*str != '\0') here because we want to parse
 663      any trailing fake arguments in the syntax string.  */
 664   syn = CGEN_SYNTAX_STRING (syntax);
 665
 666   /* Mnemonics come first for now, ensure valid string.  */
 667   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 668     abort ();
 669
 670   ++syn;
 671
 672   while (* syn != 0)
 673     {
 674       /* Non operand chars must match exactly.  */
 675       if (CGEN_SYNTAX_CHAR_P (* syn))
 676         {
 677           /* FIXME: While we allow for non-GAS callers above, we assume the
 678              first char after the mnemonic part is a space.  */
 679           /* FIXME: We also take inappropriate advantage of the fact that
 680              GAS's input scrubber will remove extraneous blanks.  */
 681           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 682             {
 683 #ifdef CGEN_MNEMONIC_OPERANDS
 684               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 685                 past_opcode_p = 1;
 686 #endif
 687               ++ syn;
 688               ++ str;
 689             }
 690           else if (*str)
 691             {
 692               /* Syntax char didn't match.  Can't be this insn.  */
 693               static char msg [80];
 694
 695               /* xgettext:c-format */
 696               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 697                        CGEN_SYNTAX_CHAR(*syn), *str);
 698               return msg;
 699             }
 700           else
 701             {
 702               /* Ran out of input.  */
 703               static char msg [80];
 704
 705               /* xgettext:c-format */
 706               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 707                        CGEN_SYNTAX_CHAR(*syn));
 708               return msg;
 709             }
 710           continue;
 711         }
 712
 713       /* We have an operand of some sort.  */
 714       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 715                                           &str, fields);
 716       if (errmsg)
 717         return errmsg;
 718
 719       /* Done with this operand, continue with next one.  */
 720       ++ syn;
 721     }
 722
 723   /* If we're at the end of the syntax string, we're done.  */
 724   if (* syn == 0)
 725     {
 726       /* FIXME: For the moment we assume a valid `str' can only contain
 727          blanks now.  IE: We needn't try again with a longer version of
 728          the insn and it is assumed that longer versions of insns appear
 729          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 730       while (ISSPACE (* str))
 731         ++ str;
 732
 733       if (* str != '\0')
 734         return _("junk at end of line"); /* FIXME: would like to include `str' */
 735
 736       return NULL;
 737     }
 738
 739   /* We couldn't parse it.  */
 740   return _("unrecognized instruction");
 741 }
 742 \f
 743 /* Main entry point.
 744    This routine is called for each instruction to be assembled.
 745    STR points to the insn to be assembled.
 746    We assume all necessary tables have been initialized.
 747    The assembled instruction, less any fixups, is stored in BUF.
 748    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 749    still needs to be converted to target byte order, otherwise BUF is an array
 750    of bytes in target byte order.
 751    The result is a pointer to the insn's entry in the opcode table,
 752    or NULL if an error occured (an error message will have already been
 753    printed).
 754
 755    Note that when processing (non-alias) macro-insns,
 756    this function recurses.
 757
 758    ??? It's possible to make this cpu-independent.
 759    One would have to deal with a few minor things.
 760    At this point in time doing so would be more of a curiosity than useful
 761    [for example this file isn't _that_ big], but keeping the possibility in
 762    mind helps keep the design clean.  */
 763
 764 const CGEN_INSN *
 765 iq2000_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 766      CGEN_CPU_DESC cd;
 767      const char *str;
 768      CGEN_FIELDS *fields;
 769      CGEN_INSN_BYTES_PTR buf;
 770      char **errmsg;
 771 {
 772   const char *start;
 773   CGEN_INSN_LIST *ilist;
 774   const char *parse_errmsg = NULL;
 775   const char *insert_errmsg = NULL;
 776   int recognized_mnemonic = 0;
 777
 778   /* Skip leading white space.  */
 779   while (ISSPACE (* str))
 780     ++ str;
 781
 782   /* The instructions are stored in hashed lists.
 783      Get the first in the list.  */
 784   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 785
 786   /* Keep looking until we find a match.  */
 787   start = str;
 788   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 789     {
 790       const CGEN_INSN *insn = ilist->insn;
 791       recognized_mnemonic = 1;
 792
 793 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 794       /* Not usually needed as unsupported opcodes
 795          shouldn't be in the hash lists.  */
 796       /* Is this insn supported by the selected cpu?  */
 797       if (! iq2000_cgen_insn_supported (cd, insn))
 798         continue;
 799 #endif
 800       /* If the RELAX attribute is set, this is an insn that shouldn't be
 801          chosen immediately.  Instead, it is used during assembler/linker
 802          relaxation if possible.  */
 803       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
 804         continue;
 805
 806       str = start;
 807
 808       /* Skip this insn if str doesn't look right lexically.  */
 809       if (CGEN_INSN_RX (insn) != NULL &&
 810           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 811         continue;
 812
 813       /* Allow parse/insert handlers to obtain length of insn.  */
 814       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 815
 816       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 817       if (parse_errmsg != NULL)
 818         continue;
 819
 820       /* ??? 0 is passed for `pc'.  */
 821       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 822                                                  (bfd_vma) 0);
 823       if (insert_errmsg != NULL)
 824         continue;
 825
 826       /* It is up to the caller to actually output the insn and any
 827          queued relocs.  */
 828       return insn;
 829     }
 830
 831   {
 832     static char errbuf[150];
 833 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 834     const char *tmp_errmsg;
 835
 836     /* If requesting verbose error messages, use insert_errmsg.
 837        Failing that, use parse_errmsg.  */
 838     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 839                   parse_errmsg ? parse_errmsg :
 840                   recognized_mnemonic ?
 841                   _("unrecognized form of instruction") :
 842                   _("unrecognized instruction"));
 843
 844     if (strlen (start) > 50)
 845       /* xgettext:c-format */
 846       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 847     else
 848       /* xgettext:c-format */
 849       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 850 #else
 851     if (strlen (start) > 50)
 852       /* xgettext:c-format */
 853       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 854     else
 855       /* xgettext:c-format */
 856       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 857 #endif
 858
 859     *errmsg = errbuf;
 860     return NULL;
 861   }
 862 }
 863 \f
 864 #if 0 /* This calls back to GAS which we can't do without care.  */
 865
 866 /* Record each member of OPVALS in the assembler's symbol table.
 867    This lets GAS parse registers for us.
 868    ??? Interesting idea but not currently used.  */
 869
 870 /* Record each member of OPVALS in the assembler's symbol table.
 871    FIXME: Not currently used.  */
 872
 873 void
 874 iq2000_cgen_asm_hash_keywords (cd, opvals)
 875      CGEN_CPU_DESC cd;
 876      CGEN_KEYWORD *opvals;
 877 {
 878   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 879   const CGEN_KEYWORD_ENTRY * ke;
 880
 881   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 882     {
 883 #if 0 /* Unnecessary, should be done in the search routine.  */
 884       if (! iq2000_cgen_opval_supported (ke))
 885         continue;
 886 #endif
 887       cgen_asm_record_register (cd, ke->name, ke->value);
 888     }
 889 }
 890
 891 #endif /* 0 */