opcodes/ip2k-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 "ip2k-desc.h"
  34 #include "ip2k-opc.h"
  35 #include "opintl.h"
  36 #include "xregex.h"
  37 #include "libiberty.h"
  38 #include "safe-ctype.h"
  39
  40 #undef  min
  41 #define min(a,b) ((a) < (b) ? (a) : (b))
  42 #undef  max
  43 #define max(a,b) ((a) > (b) ? (a) : (b))
  44
  45 static const char * parse_insn_normal
  46      PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *));
  47 \f
  48 /* -- assembler routines inserted here.  */
  49
  50 /* -- asm.c */
  51
  52 #define PARSE_FUNC_DECL(name) \
  53 static const char *name PARAMS ((CGEN_CPU_DESC, const char **, int, long *))
  54
  55 PARSE_FUNC_DECL (parse_fr);
  56 PARSE_FUNC_DECL (parse_addr16);
  57 PARSE_FUNC_DECL (parse_addr16_p);
  58 PARSE_FUNC_DECL (parse_addr16_cjp);
  59 PARSE_FUNC_DECL (parse_lit8);
  60 PARSE_FUNC_DECL (parse_bit3);
  61
  62
  63 static const char *
  64 parse_fr (cd, strp, opindex, valuep)
  65      CGEN_CPU_DESC cd;
  66      const char **strp;
  67      int opindex;
  68      long *valuep;
  69 {
  70   const char *errmsg;
  71   const char *old_strp;
  72   char *afteroffset;
  73   enum cgen_parse_operand_result result_type;
  74   bfd_vma value;
  75   extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
  76   bfd_vma tempvalue;
  77
  78   old_strp = *strp;
  79   afteroffset = NULL;
  80
  81
  82   /* Check here to see if you're about to try parsing a w as the first arg */
  83   /* and return an error if you are.                                       */
  84   if ( (strncmp(*strp,"w",1)==0) || (strncmp(*strp,"W",1)==0) )
  85     {
  86       (*strp)++;
  87
  88       if ( (strncmp(*strp,",",1)==0) || ISSPACE(**strp) )
  89         {
  90           /* We've been passed a w.  Return with an error message so that  */
  91           /* cgen will try the next parsing option.                        */
  92           errmsg = _("W keyword invalid in FR operand slot.");
  93           return errmsg;
  94         }
  95       *strp = old_strp;
  96     }
  97
  98
  99   /* Attempt parse as register keyword. */
 100   /* old_strp = *strp; */
 101
 102   errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names,
 103                                valuep);
 104   if ( *strp != NULL )
 105     if (errmsg == NULL)
 106       return errmsg;
 107
 108   /* Attempt to parse for "(IP)" */
 109   afteroffset = strstr(*strp,"(IP)");
 110
 111   if ( afteroffset == NULL)
 112     {
 113       /* Make sure it's not in lower case */
 114       afteroffset = strstr(*strp,"(ip)");
 115     }
 116
 117   if ( afteroffset != NULL )
 118     {
 119       if ( afteroffset != *strp )
 120         {
 121           /* Invalid offset present.*/
 122           errmsg = _("offset(IP) is not a valid form");
 123           return errmsg;
 124         }
 125       else
 126         {
 127           *strp += 4;
 128           *valuep = 0;
 129           errmsg = NULL;
 130           return errmsg;
 131         }
 132     }
 133
 134   /* Attempt to parse for DP. ex: mov w, offset(DP)  */
 135   /*                              mov offset(DP),w   */
 136
 137   /* Try parsing it as an address and see what comes back */
 138
 139   afteroffset = strstr(*strp,"(DP)");
 140
 141   if ( afteroffset == NULL)
 142     {
 143       /* Maybe it's in lower case */
 144       afteroffset = strstr(*strp,"(dp)");
 145     }
 146
 147   if ( afteroffset != NULL )
 148     {
 149       if ( afteroffset == *strp )
 150         {
 151           /* No offset present. Use 0 by default. */
 152           tempvalue = 0;
 153           errmsg = NULL;
 154         }
 155       else
 156         {
 157           errmsg = cgen_parse_address (cd, strp, opindex,
 158                                        BFD_RELOC_IP2K_FR_OFFSET,
 159                                        & result_type, & tempvalue);
 160         }
 161
 162       if (errmsg == NULL)
 163         {
 164           if (tempvalue <= 127)
 165             {
 166               /* Value is ok.  Fix up the first 2 bits and return */
 167               *valuep = 0x0100 | tempvalue;
 168               *strp += 4; /* skip over the (DP) in *strp */
 169               return errmsg;
 170             }
 171           else
 172             {
 173               /* Found something there in front of (DP) but it's out
 174                  of range. */
 175               errmsg = _("(DP) offset out of range.");
 176               return errmsg;
 177             }
 178         }
 179     }
 180
 181
 182   /* Attempt to parse for SP. ex: mov w, offset(SP)  */
 183   /*                              mov offset(SP), w  */
 184
 185
 186   afteroffset = strstr(*strp,"(SP)");
 187
 188   if (afteroffset == NULL)
 189     {
 190       /* Maybe it's in lower case. */
 191       afteroffset = strstr(*strp, "(sp)");
 192     }
 193
 194   if ( afteroffset != NULL )
 195     {
 196       if ( afteroffset ==  *strp )
 197         {
 198           /* No offset present. Use 0 by default. */
 199           tempvalue = 0;
 200           errmsg = NULL;
 201         }
 202       else
 203         {
 204           errmsg = cgen_parse_address (cd, strp, opindex,
 205                                        BFD_RELOC_IP2K_FR_OFFSET,
 206                                        & result_type, & tempvalue);
 207         }
 208       if (errmsg == NULL)
 209         {
 210           if (tempvalue <= 127)
 211             {
 212               /* Value is ok.  Fix up the first 2 bits and return */
 213               *valuep = 0x0180 | tempvalue;
 214               *strp += 4; /* skip over the (SP) in *strp */
 215               return errmsg;
 216             }
 217           else
 218             {
 219               /* Found something there in front of (SP) but it's out
 220                  of range. */
 221               errmsg = _("(SP) offset out of range.");
 222               return errmsg;
 223             }
 224
 225         }
 226     }
 227
 228
 229   /* Attempt to parse as an address. */
 230   *strp = old_strp;
 231   errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9,
 232                                & result_type, & value);
 233   if (errmsg == NULL)
 234     {
 235       *valuep = value;
 236
 237       /* if a parenthesis is found, warn about invalid form */
 238
 239       if (**strp == '(')
 240         {
 241           errmsg = _("illegal use of parentheses");
 242         }
 243       /* if a numeric value is specified, ensure that it is between
 244          1 and 255 */
 245       else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 246         {
 247           if (value < 0x1 || value > 0xff)
 248             errmsg = _("operand out of range (not between 1 and 255)");
 249         }
 250     }
 251   return errmsg;
 252 }
 253
 254 static const char *
 255 parse_addr16 (cd, strp, opindex, valuep)
 256      CGEN_CPU_DESC cd;
 257      const char **strp;
 258      int opindex;
 259      long *valuep;
 260 {
 261   const char *errmsg;
 262   enum cgen_parse_operand_result result_type;
 263   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 264   bfd_vma value;
 265
 266   if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16H )
 267     code = BFD_RELOC_IP2K_HI8DATA;
 268   else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16L )
 269     code = BFD_RELOC_IP2K_LO8DATA;
 270   else
 271     {
 272       /* Something is very wrong. opindex has to be one of the above. */
 273       errmsg = _("parse_addr16: invalid opindex.");
 274       return errmsg;
 275     }
 276
 277   errmsg = cgen_parse_address (cd, strp, opindex, code,
 278                                & result_type, & value);
 279   if (errmsg == NULL)
 280     {
 281       /* We either have a relocation or a number now. */
 282       if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
 283         {
 284           /* We got a number back. */
 285           if ( code == BFD_RELOC_IP2K_HI8DATA )
 286             value >>= 8;
 287           else    /* code = BFD_RELOC_IP2K_LOW8DATA */
 288             value &= 0x00FF;
 289         }
 290       *valuep = value;
 291     }
 292
 293   return errmsg;
 294 }
 295
 296
 297 static const char *
 298 parse_addr16_p (cd, strp, opindex, valuep)
 299      CGEN_CPU_DESC cd;
 300      const char **strp;
 301      int opindex;
 302      long *valuep;
 303 {
 304   const char *errmsg;
 305   enum cgen_parse_operand_result result_type;
 306   bfd_reloc_code_real_type code = BFD_RELOC_IP2K_PAGE3;
 307   bfd_vma value;
 308
 309   errmsg = cgen_parse_address (cd, strp, opindex, code,
 310                                & result_type, & value);
 311   if (errmsg == NULL)
 312     {
 313       if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
 314         *valuep = (value >> 13) & 0x7;
 315       else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED )
 316         *valuep = value;
 317     }
 318   return errmsg;
 319 }
 320
 321
 322 static const char *
 323 parse_addr16_cjp (cd, strp, opindex, valuep)
 324      CGEN_CPU_DESC cd;
 325      const char **strp;
 326      int opindex;
 327      long *valuep;
 328 {
 329   const char *errmsg;
 330   enum cgen_parse_operand_result result_type;
 331   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 332   bfd_vma value;
 333
 334   if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP )
 335     code = BFD_RELOC_IP2K_ADDR16CJP;
 336   else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P )
 337     code = BFD_RELOC_IP2K_PAGE3;
 338
 339   errmsg = cgen_parse_address (cd, strp, opindex, code,
 340                                & result_type, & value);
 341   if (errmsg == NULL)
 342     {
 343       if ( result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER )
 344         {
 345           if ( (value & 0x1) == 0)  /* If the address is even .... */
 346             {
 347               if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16CJP )
 348                 *valuep = (value >> 1) & 0x1FFF;  /* Should mask be 1FFF? */
 349               else if ( opindex == (CGEN_OPERAND_TYPE)IP2K_OPERAND_ADDR16P )
 350                 *valuep = (value >> 14) & 0x7;
 351             }
 352           else
 353             errmsg = _("Byte address required. - must be even.");
 354         }
 355       else if ( result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED )
 356         {
 357           /* This will happen for things like (s2-s1) where s2 and s1
 358              are labels.  */
 359           *valuep = value;
 360         }
 361       else
 362         errmsg = _("cgen_parse_address returned a symbol. Literal required.");
 363     }
 364   return errmsg;
 365 }
 366
 367
 368 static const char *
 369 parse_lit8 (cd, strp, opindex, valuep)
 370      CGEN_CPU_DESC cd;
 371      const char **strp;
 372      int opindex;
 373      long *valuep;
 374 {
 375   const char *errmsg;
 376   enum cgen_parse_operand_result result_type;
 377   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 378   bfd_vma value;
 379
 380   /* Parse %OP relocating operators. */
 381   if (strncmp (*strp, "%bank", 5) == 0)
 382     {
 383       *strp += 5;
 384       code = BFD_RELOC_IP2K_BANK;
 385     }
 386   else if (strncmp (*strp, "%lo8data", 8) == 0)
 387     {
 388       *strp += 8;
 389       code = BFD_RELOC_IP2K_LO8DATA;
 390     }
 391   else if (strncmp (*strp, "%hi8data", 8) == 0)
 392     {
 393       *strp += 8;
 394       code = BFD_RELOC_IP2K_HI8DATA;
 395     }
 396   else if (strncmp (*strp, "%ex8data", 8) == 0)
 397     {
 398       *strp += 8;
 399       code = BFD_RELOC_IP2K_EX8DATA;
 400     }
 401   else if (strncmp (*strp, "%lo8insn", 8) == 0)
 402     {
 403       *strp += 8;
 404       code = BFD_RELOC_IP2K_LO8INSN;
 405     }
 406   else if (strncmp (*strp, "%hi8insn", 8) == 0)
 407     {
 408       *strp += 8;
 409       code = BFD_RELOC_IP2K_HI8INSN;
 410     }
 411
 412
 413   /* Parse %op operand.  */
 414   if (code != BFD_RELOC_NONE)
 415     {
 416       errmsg = cgen_parse_address (cd, strp, opindex, code,
 417                                    & result_type, & value);
 418       if ((errmsg == NULL) &&
 419           (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED))
 420         errmsg = _("%operator operand is not a symbol");
 421
 422       *valuep = value;
 423     }
 424   /* Parse as a number.  */
 425   else
 426     {
 427       errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
 428
 429       /* Truncate to eight bits to accept both signed and unsigned input. */
 430       if (errmsg == NULL)
 431         *valuep &= 0xFF;
 432     }
 433
 434   return errmsg;
 435 }
 436
 437 static const char *
 438 parse_bit3 (cd, strp, opindex, valuep)
 439      CGEN_CPU_DESC cd;
 440      const char **strp;
 441      int opindex;
 442      long *valuep;
 443 {
 444   const char *errmsg;
 445   char mode = 0;
 446   long count = 0;
 447   unsigned long value;
 448
 449   if (strncmp (*strp, "%bit", 4) == 0)
 450     {
 451       *strp += 4;
 452       mode = 1;
 453     }
 454   else if (strncmp (*strp, "%msbbit", 7) == 0)
 455     {
 456       *strp += 7;
 457       mode = 1;
 458     }
 459   else if (strncmp (*strp, "%lsbbit", 7) == 0)
 460     {
 461       *strp += 7;
 462       mode = 2;
 463     }
 464
 465   errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
 466   if (errmsg)
 467     return errmsg;
 468
 469   if (mode)
 470     {
 471       value = (unsigned long) *valuep;
 472       if (value == 0)
 473         {
 474           errmsg = _("Attempt to find bit index of 0");
 475           return errmsg;
 476         }
 477
 478       if (mode == 1)
 479         {
 480           count = 31;
 481           while ((value & 0x80000000) == 0)
 482             {
 483               count--;
 484               value <<= 1;
 485             }
 486         }
 487       else if (mode == 2)
 488         {
 489           count = 0;
 490           while ((value & 0x00000001) == 0)
 491             {
 492               count++;
 493               value >>= 1;
 494             }
 495         }
 496
 497       *valuep = count;
 498     }
 499
 500   return errmsg;
 501 }
 502
 503
 504 /* -- dis.c */
 505
 506 const char * ip2k_cgen_parse_operand
 507   PARAMS ((CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *));
 508
 509 /* Main entry point for operand parsing.
 510
 511    This function is basically just a big switch statement.  Earlier versions
 512    used tables to look up the function to use, but
 513    - if the table contains both assembler and disassembler functions then
 514      the disassembler contains much of the assembler and vice-versa,
 515    - there's a lot of inlining possibilities as things grow,
 516    - using a switch statement avoids the function call overhead.
 517
 518    This function could be moved into `parse_insn_normal', but keeping it
 519    separate makes clear the interface between `parse_insn_normal' and each of
 520    the handlers.  */
 521
 522 const char *
 523 ip2k_cgen_parse_operand (cd, opindex, strp, fields)
 524      CGEN_CPU_DESC cd;
 525      int opindex;
 526      const char ** strp;
 527      CGEN_FIELDS * fields;
 528 {
 529   const char * errmsg = NULL;
 530   /* Used by scalar operands that still need to be parsed.  */
 531   long junk ATTRIBUTE_UNUSED;
 532
 533   switch (opindex)
 534     {
 535     case IP2K_OPERAND_ADDR16CJP :
 536       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, &fields->f_addr16cjp);
 537       break;
 538     case IP2K_OPERAND_ADDR16H :
 539       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, &fields->f_imm8);
 540       break;
 541     case IP2K_OPERAND_ADDR16L :
 542       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, &fields->f_imm8);
 543       break;
 544     case IP2K_OPERAND_ADDR16P :
 545       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, &fields->f_page3);
 546       break;
 547     case IP2K_OPERAND_BITNO :
 548       errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, &fields->f_bitno);
 549       break;
 550     case IP2K_OPERAND_CBIT :
 551       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, &junk);
 552       break;
 553     case IP2K_OPERAND_DCBIT :
 554       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, &junk);
 555       break;
 556     case IP2K_OPERAND_FR :
 557       errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, &fields->f_reg);
 558       break;
 559     case IP2K_OPERAND_LIT8 :
 560       errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, &fields->f_imm8);
 561       break;
 562     case IP2K_OPERAND_PABITS :
 563       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, &junk);
 564       break;
 565     case IP2K_OPERAND_RETI3 :
 566       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, &fields->f_reti3);
 567       break;
 568     case IP2K_OPERAND_ZBIT :
 569       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, &junk);
 570       break;
 571
 572     default :
 573       /* xgettext:c-format */
 574       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 575       abort ();
 576   }
 577
 578   return errmsg;
 579 }
 580
 581 cgen_parse_fn * const ip2k_cgen_parse_handlers[] =
 582 {
 583   parse_insn_normal,
 584 };
 585
 586 void
 587 ip2k_cgen_init_asm (cd)
 588      CGEN_CPU_DESC cd;
 589 {
 590   ip2k_cgen_init_opcode_table (cd);
 591   ip2k_cgen_init_ibld_table (cd);
 592   cd->parse_handlers = & ip2k_cgen_parse_handlers[0];
 593   cd->parse_operand = ip2k_cgen_parse_operand;
 594 }
 595
 596 \f
 597
 598 /* Regex construction routine.
 599
 600    This translates an opcode syntax string into a regex string,
 601    by replacing any non-character syntax element (such as an
 602    opcode) with the pattern '.*'
 603
 604    It then compiles the regex and stores it in the opcode, for
 605    later use by ip2k_cgen_assemble_insn
 606
 607    Returns NULL for success, an error message for failure.  */
 608
 609 char *
 610 ip2k_cgen_build_insn_regex (insn)
 611      CGEN_INSN *insn;
 612 {
 613   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 614   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 615   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 616   char *rx = rxbuf;
 617   const CGEN_SYNTAX_CHAR_TYPE *syn;
 618   int reg_err;
 619
 620   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 621
 622   /* Mnemonics come first in the syntax string.  */
 623   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 624     return _("missing mnemonic in syntax string");
 625   ++syn;
 626
 627   /* Generate a case sensitive regular expression that emulates case
 628      insensitive matching in the "C" locale.  We cannot generate a case
 629      insensitive regular expression because in Turkish locales, 'i' and 'I'
 630      are not equal modulo case conversion.  */
 631
 632   /* Copy the literal mnemonic out of the insn.  */
 633   for (; *mnem; mnem++)
 634     {
 635       char c = *mnem;
 636
 637       if (ISALPHA (c))
 638         {
 639           *rx++ = '[';
 640           *rx++ = TOLOWER (c);
 641           *rx++ = TOUPPER (c);
 642           *rx++ = ']';
 643         }
 644       else
 645         *rx++ = c;
 646     }
 647
 648   /* Copy any remaining literals from the syntax string into the rx.  */
 649   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 650     {
 651       if (CGEN_SYNTAX_CHAR_P (* syn))
 652         {
 653           char c = CGEN_SYNTAX_CHAR (* syn);
 654
 655           switch (c)
 656             {
 657               /* Escape any regex metacharacters in the syntax.  */
 658             case '.': case '[': case '\\':
 659             case '*': case '^': case '$':
 660
 661 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 662             case '?': case '{': case '}':
 663             case '(': case ')': case '*':
 664             case '|': case '+': case ']':
 665 #endif
 666               *rx++ = '\\';
 667               *rx++ = c;
 668               break;
 669
 670             default:
 671               if (ISALPHA (c))
 672                 {
 673                   *rx++ = '[';
 674                   *rx++ = TOLOWER (c);
 675                   *rx++ = TOUPPER (c);
 676                   *rx++ = ']';
 677                 }
 678               else
 679                 *rx++ = c;
 680               break;
 681             }
 682         }
 683       else
 684         {
 685           /* Replace non-syntax fields with globs.  */
 686           *rx++ = '.';
 687           *rx++ = '*';
 688         }
 689     }
 690
 691   /* Trailing whitespace ok.  */
 692   * rx++ = '[';
 693   * rx++ = ' ';
 694   * rx++ = '\t';
 695   * rx++ = ']';
 696   * rx++ = '*';
 697
 698   /* But anchor it after that.  */
 699   * rx++ = '$';
 700   * rx = '\0';
 701
 702   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 703   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 704
 705   if (reg_err == 0)
 706     return NULL;
 707   else
 708     {
 709       static char msg[80];
 710
 711       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 712       regfree ((regex_t *) CGEN_INSN_RX (insn));
 713       free (CGEN_INSN_RX (insn));
 714       (CGEN_INSN_RX (insn)) = NULL;
 715       return msg;
 716     }
 717 }
 718
 719 \f
 720 /* Default insn parser.
 721
 722    The syntax string is scanned and operands are parsed and stored in FIELDS.
 723    Relocs are queued as we go via other callbacks.
 724
 725    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 726    parse the instruction, we return 0 and the caller will start over from
 727    the beginning.  Backtracking will be necessary in parsing subexpressions,
 728    but that can be handled there.  Not handling backtracking here may get
 729    expensive in the case of the m68k.  Deal with later.
 730
 731    Returns NULL for success, an error message for failure.  */
 732
 733 static const char *
 734 parse_insn_normal (cd, insn, strp, fields)
 735      CGEN_CPU_DESC cd;
 736      const CGEN_INSN *insn;
 737      const char **strp;
 738      CGEN_FIELDS *fields;
 739 {
 740   /* ??? Runtime added insns not handled yet.  */
 741   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 742   const char *str = *strp;
 743   const char *errmsg;
 744   const char *p;
 745   const CGEN_SYNTAX_CHAR_TYPE * syn;
 746 #ifdef CGEN_MNEMONIC_OPERANDS
 747   /* FIXME: wip */
 748   int past_opcode_p;
 749 #endif
 750
 751   /* For now we assume the mnemonic is first (there are no leading operands).
 752      We can parse it without needing to set up operand parsing.
 753      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 754      not be called from GAS.  */
 755   p = CGEN_INSN_MNEMONIC (insn);
 756   while (*p && TOLOWER (*p) == TOLOWER (*str))
 757     ++p, ++str;
 758
 759   if (* p)
 760     return _("unrecognized instruction");
 761
 762 #ifndef CGEN_MNEMONIC_OPERANDS
 763   if (* str && ! ISSPACE (* str))
 764     return _("unrecognized instruction");
 765 #endif
 766
 767   CGEN_INIT_PARSE (cd);
 768   cgen_init_parse_operand (cd);
 769 #ifdef CGEN_MNEMONIC_OPERANDS
 770   past_opcode_p = 0;
 771 #endif
 772
 773   /* We don't check for (*str != '\0') here because we want to parse
 774      any trailing fake arguments in the syntax string.  */
 775   syn = CGEN_SYNTAX_STRING (syntax);
 776
 777   /* Mnemonics come first for now, ensure valid string.  */
 778   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 779     abort ();
 780
 781   ++syn;
 782
 783   while (* syn != 0)
 784     {
 785       /* Non operand chars must match exactly.  */
 786       if (CGEN_SYNTAX_CHAR_P (* syn))
 787         {
 788           /* FIXME: While we allow for non-GAS callers above, we assume the
 789              first char after the mnemonic part is a space.  */
 790           /* FIXME: We also take inappropriate advantage of the fact that
 791              GAS's input scrubber will remove extraneous blanks.  */
 792           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 793             {
 794 #ifdef CGEN_MNEMONIC_OPERANDS
 795               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 796                 past_opcode_p = 1;
 797 #endif
 798               ++ syn;
 799               ++ str;
 800             }
 801           else if (*str)
 802             {
 803               /* Syntax char didn't match.  Can't be this insn.  */
 804               static char msg [80];
 805
 806               /* xgettext:c-format */
 807               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 808                        CGEN_SYNTAX_CHAR(*syn), *str);
 809               return msg;
 810             }
 811           else
 812             {
 813               /* Ran out of input.  */
 814               static char msg [80];
 815
 816               /* xgettext:c-format */
 817               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 818                        CGEN_SYNTAX_CHAR(*syn));
 819               return msg;
 820             }
 821           continue;
 822         }
 823
 824       /* We have an operand of some sort.  */
 825       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 826                                           &str, fields);
 827       if (errmsg)
 828         return errmsg;
 829
 830       /* Done with this operand, continue with next one.  */
 831       ++ syn;
 832     }
 833
 834   /* If we're at the end of the syntax string, we're done.  */
 835   if (* syn == 0)
 836     {
 837       /* FIXME: For the moment we assume a valid `str' can only contain
 838          blanks now.  IE: We needn't try again with a longer version of
 839          the insn and it is assumed that longer versions of insns appear
 840          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 841       while (ISSPACE (* str))
 842         ++ str;
 843
 844       if (* str != '\0')
 845         return _("junk at end of line"); /* FIXME: would like to include `str' */
 846
 847       return NULL;
 848     }
 849
 850   /* We couldn't parse it.  */
 851   return _("unrecognized instruction");
 852 }
 853 \f
 854 /* Main entry point.
 855    This routine is called for each instruction to be assembled.
 856    STR points to the insn to be assembled.
 857    We assume all necessary tables have been initialized.
 858    The assembled instruction, less any fixups, is stored in BUF.
 859    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 860    still needs to be converted to target byte order, otherwise BUF is an array
 861    of bytes in target byte order.
 862    The result is a pointer to the insn's entry in the opcode table,
 863    or NULL if an error occured (an error message will have already been
 864    printed).
 865
 866    Note that when processing (non-alias) macro-insns,
 867    this function recurses.
 868
 869    ??? It's possible to make this cpu-independent.
 870    One would have to deal with a few minor things.
 871    At this point in time doing so would be more of a curiosity than useful
 872    [for example this file isn't _that_ big], but keeping the possibility in
 873    mind helps keep the design clean.  */
 874
 875 const CGEN_INSN *
 876 ip2k_cgen_assemble_insn (cd, str, fields, buf, errmsg)
 877      CGEN_CPU_DESC cd;
 878      const char *str;
 879      CGEN_FIELDS *fields;
 880      CGEN_INSN_BYTES_PTR buf;
 881      char **errmsg;
 882 {
 883   const char *start;
 884   CGEN_INSN_LIST *ilist;
 885   const char *parse_errmsg = NULL;
 886   const char *insert_errmsg = NULL;
 887   int recognized_mnemonic = 0;
 888
 889   /* Skip leading white space.  */
 890   while (ISSPACE (* str))
 891     ++ str;
 892
 893   /* The instructions are stored in hashed lists.
 894      Get the first in the list.  */
 895   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 896
 897   /* Keep looking until we find a match.  */
 898   start = str;
 899   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 900     {
 901       const CGEN_INSN *insn = ilist->insn;
 902       recognized_mnemonic = 1;
 903
 904 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 905       /* Not usually needed as unsupported opcodes
 906          shouldn't be in the hash lists.  */
 907       /* Is this insn supported by the selected cpu?  */
 908       if (! ip2k_cgen_insn_supported (cd, insn))
 909         continue;
 910 #endif
 911       /* If the RELAX attribute is set, this is an insn that shouldn't be
 912          chosen immediately.  Instead, it is used during assembler/linker
 913          relaxation if possible.  */
 914       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX) != 0)
 915         continue;
 916
 917       str = start;
 918
 919       /* Skip this insn if str doesn't look right lexically.  */
 920       if (CGEN_INSN_RX (insn) != NULL &&
 921           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 922         continue;
 923
 924       /* Allow parse/insert handlers to obtain length of insn.  */
 925       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 926
 927       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 928       if (parse_errmsg != NULL)
 929         continue;
 930
 931       /* ??? 0 is passed for `pc'.  */
 932       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 933                                                  (bfd_vma) 0);
 934       if (insert_errmsg != NULL)
 935         continue;
 936
 937       /* It is up to the caller to actually output the insn and any
 938          queued relocs.  */
 939       return insn;
 940     }
 941
 942   {
 943     static char errbuf[150];
 944 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 945     const char *tmp_errmsg;
 946
 947     /* If requesting verbose error messages, use insert_errmsg.
 948        Failing that, use parse_errmsg.  */
 949     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 950                   parse_errmsg ? parse_errmsg :
 951                   recognized_mnemonic ?
 952                   _("unrecognized form of instruction") :
 953                   _("unrecognized instruction"));
 954
 955     if (strlen (start) > 50)
 956       /* xgettext:c-format */
 957       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 958     else
 959       /* xgettext:c-format */
 960       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 961 #else
 962     if (strlen (start) > 50)
 963       /* xgettext:c-format */
 964       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 965     else
 966       /* xgettext:c-format */
 967       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 968 #endif
 969
 970     *errmsg = errbuf;
 971     return NULL;
 972   }
 973 }
 974 \f
 975 #if 0 /* This calls back to GAS which we can't do without care.  */
 976
 977 /* Record each member of OPVALS in the assembler's symbol table.
 978    This lets GAS parse registers for us.
 979    ??? Interesting idea but not currently used.  */
 980
 981 /* Record each member of OPVALS in the assembler's symbol table.
 982    FIXME: Not currently used.  */
 983
 984 void
 985 ip2k_cgen_asm_hash_keywords (cd, opvals)
 986      CGEN_CPU_DESC cd;
 987      CGEN_KEYWORD *opvals;
 988 {
 989   CGEN_KEYWORD_SEARCH search = cgen_keyword_search_init (opvals, NULL);
 990   const CGEN_KEYWORD_ENTRY * ke;
 991
 992   while ((ke = cgen_keyword_search_next (& search)) != NULL)
 993     {
 994 #if 0 /* Unnecessary, should be done in the search routine.  */
 995       if (! ip2k_cgen_opval_supported (ke))
 996         continue;
 997 #endif
 998       cgen_asm_record_register (cd, ke->name, ke->value);
 999     }
1000 }
1001
1002 #endif /* 0 */