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, 2005
   8    Free Software Foundation, Inc.
   9
  10    This file is part of the GNU Binutils and GDB, the GNU debugger.
  11
  12    This program 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 2, or (at your option)
  15    any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public 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 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  27    Keep that in mind.  */
  28
  29 #include "sysdep.h"
  30 #include <stdio.h>
  31 #include "ansidecl.h"
  32 #include "bfd.h"
  33 #include "symcat.h"
  34 #include "ip2k-desc.h"
  35 #include "ip2k-opc.h"
  36 #include "opintl.h"
  37 #include "xregex.h"
  38 #include "libiberty.h"
  39 #include "safe-ctype.h"
  40
  41 #undef  min
  42 #define min(a,b) ((a) < (b) ? (a) : (b))
  43 #undef  max
  44 #define max(a,b) ((a) > (b) ? (a) : (b))
  45
  46 static const char * parse_insn_normal
  47   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  48 \f
  49 /* -- assembler routines inserted here.  */
  50
  51 /* -- asm.c */
  52
  53 static const char *
  54 parse_fr (CGEN_CPU_DESC cd,
  55           const char **strp,
  56           int opindex,
  57           unsigned long *valuep)
  58 {
  59   const char *errmsg;
  60   const char *old_strp;
  61   char *afteroffset;
  62   enum cgen_parse_operand_result result_type;
  63   bfd_vma value;
  64   extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
  65   bfd_vma tempvalue;
  66
  67   old_strp = *strp;
  68   afteroffset = NULL;
  69
  70   /* Check here to see if you're about to try parsing a w as the first arg
  71      and return an error if you are.  */
  72   if ((strncmp (*strp, "w", 1) == 0) || (strncmp (*strp, "W", 1) == 0))
  73     {
  74       (*strp)++;
  75
  76       if ((strncmp (*strp, ",", 1) == 0) || ISSPACE (**strp))
  77         {
  78           /* We've been passed a w.  Return with an error message so that
  79              cgen will try the next parsing option.  */
  80           errmsg = _("W keyword invalid in FR operand slot.");
  81           return errmsg;
  82         }
  83       *strp = old_strp;
  84     }
  85
  86   /* Attempt parse as register keyword. */
  87   errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names,
  88                                (long *) valuep);
  89   if (*strp != NULL
  90       && errmsg == NULL)
  91     return errmsg;
  92
  93   /* Attempt to parse for "(IP)".  */
  94   afteroffset = strstr (*strp, "(IP)");
  95
  96   if (afteroffset == NULL)
  97     /* Make sure it's not in lower case.  */
  98     afteroffset = strstr (*strp, "(ip)");
  99
 100   if (afteroffset != NULL)
 101     {
 102       if (afteroffset != *strp)
 103         {
 104           /* Invalid offset present.  */
 105           errmsg = _("offset(IP) is not a valid form");
 106           return errmsg;
 107         }
 108       else
 109         {
 110           *strp += 4;
 111           *valuep = 0;
 112           errmsg = NULL;
 113           return errmsg;
 114         }
 115     }
 116
 117   /* Attempt to parse for DP. ex: mov w, offset(DP)
 118                                   mov offset(DP),w   */
 119
 120   /* Try parsing it as an address and see what comes back.  */
 121   afteroffset = strstr (*strp, "(DP)");
 122
 123   if (afteroffset == NULL)
 124     /* Maybe it's in lower case.  */
 125     afteroffset = strstr (*strp, "(dp)");
 126
 127   if (afteroffset != NULL)
 128     {
 129       if (afteroffset == *strp)
 130         {
 131           /* No offset present. Use 0 by default.  */
 132           tempvalue = 0;
 133           errmsg = NULL;
 134         }
 135       else
 136         errmsg = cgen_parse_address (cd, strp, opindex,
 137                                      BFD_RELOC_IP2K_FR_OFFSET,
 138                                      & result_type, & tempvalue);
 139
 140       if (errmsg == NULL)
 141         {
 142           if (tempvalue <= 127)
 143             {
 144               /* Value is ok.  Fix up the first 2 bits and return.  */
 145               *valuep = 0x0100 | tempvalue;
 146               *strp += 4; /* Skip over the (DP) in *strp.  */
 147               return errmsg;
 148             }
 149           else
 150             {
 151               /* Found something there in front of (DP) but it's out
 152                  of range.  */
 153               errmsg = _("(DP) offset out of range.");
 154               return errmsg;
 155             }
 156         }
 157     }
 158
 159
 160   /* Attempt to parse for SP. ex: mov w, offset(SP)
 161                                   mov offset(SP), w.  */
 162   afteroffset = strstr (*strp, "(SP)");
 163
 164   if (afteroffset == NULL)
 165     /* Maybe it's in lower case.  */
 166     afteroffset = strstr (*strp, "(sp)");
 167
 168   if (afteroffset != NULL)
 169     {
 170       if (afteroffset == *strp)
 171         {
 172           /* No offset present. Use 0 by default.  */
 173           tempvalue = 0;
 174           errmsg = NULL;
 175         }
 176       else
 177         errmsg = cgen_parse_address (cd, strp, opindex,
 178                                      BFD_RELOC_IP2K_FR_OFFSET,
 179                                      & result_type, & tempvalue);
 180
 181       if (errmsg == NULL)
 182         {
 183           if (tempvalue <= 127)
 184             {
 185               /* Value is ok.  Fix up the first 2 bits and return.  */
 186               *valuep = 0x0180 | tempvalue;
 187               *strp += 4; /* Skip over the (SP) in *strp.  */
 188               return errmsg;
 189             }
 190           else
 191             {
 192               /* Found something there in front of (SP) but it's out
 193                  of range.  */
 194               errmsg = _("(SP) offset out of range.");
 195               return errmsg;
 196             }
 197         }
 198     }
 199
 200   /* Attempt to parse as an address.  */
 201   *strp = old_strp;
 202   errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9,
 203                                & result_type, & value);
 204   if (errmsg == NULL)
 205     {
 206       *valuep = value;
 207
 208       /* If a parenthesis is found, warn about invalid form.  */
 209       if (**strp == '(')
 210         errmsg = _("illegal use of parentheses");
 211
 212       /* If a numeric value is specified, ensure that it is between
 213          1 and 255.  */
 214       else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 215         {
 216           if (value < 0x1 || value > 0xff)
 217             errmsg = _("operand out of range (not between 1 and 255)");
 218         }
 219     }
 220   return errmsg;
 221 }
 222
 223 static const char *
 224 parse_addr16 (CGEN_CPU_DESC cd,
 225               const char **strp,
 226               int opindex,
 227               unsigned long *valuep)
 228 {
 229   const char *errmsg;
 230   enum cgen_parse_operand_result result_type;
 231   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 232   bfd_vma value;
 233
 234   if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16H)
 235     code = BFD_RELOC_IP2K_HI8DATA;
 236   else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16L)
 237     code = BFD_RELOC_IP2K_LO8DATA;
 238   else
 239     {
 240       /* Something is very wrong. opindex has to be one of the above.  */
 241       errmsg = _("parse_addr16: invalid opindex.");
 242       return errmsg;
 243     }
 244
 245   errmsg = cgen_parse_address (cd, strp, opindex, code,
 246                                & result_type, & value);
 247   if (errmsg == NULL)
 248     {
 249       /* We either have a relocation or a number now.  */
 250       if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 251         {
 252           /* We got a number back.  */
 253           if (code == BFD_RELOC_IP2K_HI8DATA)
 254             value >>= 8;
 255           else
 256             /* code = BFD_RELOC_IP2K_LOW8DATA.  */
 257             value &= 0x00FF;
 258         }
 259       *valuep = value;
 260     }
 261
 262   return errmsg;
 263 }
 264
 265 static const char *
 266 parse_addr16_cjp (CGEN_CPU_DESC cd,
 267                   const char **strp,
 268                   int opindex,
 269                   unsigned long *valuep)
 270 {
 271   const char *errmsg;
 272   enum cgen_parse_operand_result result_type;
 273   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 274   bfd_vma value;
 275
 276   if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
 277     code = BFD_RELOC_IP2K_ADDR16CJP;
 278   else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
 279     code = BFD_RELOC_IP2K_PAGE3;
 280
 281   errmsg = cgen_parse_address (cd, strp, opindex, code,
 282                                & result_type, & value);
 283   if (errmsg == NULL)
 284     {
 285       if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 286         {
 287           if ((value & 0x1) == 0)  /* If the address is even .... */
 288             {
 289               if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
 290                 *valuep = (value >> 1) & 0x1FFF;  /* Should mask be 1FFF?  */
 291               else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
 292                 *valuep = (value >> 14) & 0x7;
 293             }
 294           else
 295             errmsg = _("Byte address required. - must be even.");
 296         }
 297       else if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED)
 298         {
 299           /* This will happen for things like (s2-s1) where s2 and s1
 300              are labels.  */
 301           *valuep = value;
 302         }
 303       else
 304         errmsg = _("cgen_parse_address returned a symbol. Literal required.");
 305     }
 306   return errmsg;
 307 }
 308
 309 static const char *
 310 parse_lit8 (CGEN_CPU_DESC cd,
 311             const char **strp,
 312             int opindex,
 313             long *valuep)
 314 {
 315   const char *errmsg;
 316   enum cgen_parse_operand_result result_type;
 317   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 318   bfd_vma value;
 319
 320   /* Parse %OP relocating operators.  */
 321   if (strncmp (*strp, "%bank", 5) == 0)
 322     {
 323       *strp += 5;
 324       code = BFD_RELOC_IP2K_BANK;
 325     }
 326   else if (strncmp (*strp, "%lo8data", 8) == 0)
 327     {
 328       *strp += 8;
 329       code = BFD_RELOC_IP2K_LO8DATA;
 330     }
 331   else if (strncmp (*strp, "%hi8data", 8) == 0)
 332     {
 333       *strp += 8;
 334       code = BFD_RELOC_IP2K_HI8DATA;
 335     }
 336   else if (strncmp (*strp, "%ex8data", 8) == 0)
 337     {
 338       *strp += 8;
 339       code = BFD_RELOC_IP2K_EX8DATA;
 340     }
 341   else if (strncmp (*strp, "%lo8insn", 8) == 0)
 342     {
 343       *strp += 8;
 344       code = BFD_RELOC_IP2K_LO8INSN;
 345     }
 346   else if (strncmp (*strp, "%hi8insn", 8) == 0)
 347     {
 348       *strp += 8;
 349       code = BFD_RELOC_IP2K_HI8INSN;
 350     }
 351
 352   /* Parse %op operand.  */
 353   if (code != BFD_RELOC_NONE)
 354     {
 355       errmsg = cgen_parse_address (cd, strp, opindex, code,
 356                                    & result_type, & value);
 357       if ((errmsg == NULL) &&
 358           (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED))
 359         errmsg = _("percent-operator operand is not a symbol");
 360
 361       *valuep = value;
 362     }
 363   /* Parse as a number.  */
 364   else
 365     {
 366       errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
 367
 368       /* Truncate to eight bits to accept both signed and unsigned input.  */
 369       if (errmsg == NULL)
 370         *valuep &= 0xFF;
 371     }
 372
 373   return errmsg;
 374 }
 375
 376 static const char *
 377 parse_bit3 (CGEN_CPU_DESC cd,
 378             const char **strp,
 379             int opindex,
 380             unsigned long *valuep)
 381 {
 382   const char *errmsg;
 383   char mode = 0;
 384   long count = 0;
 385   unsigned long value;
 386
 387   if (strncmp (*strp, "%bit", 4) == 0)
 388     {
 389       *strp += 4;
 390       mode = 1;
 391     }
 392   else if (strncmp (*strp, "%msbbit", 7) == 0)
 393     {
 394       *strp += 7;
 395       mode = 1;
 396     }
 397   else if (strncmp (*strp, "%lsbbit", 7) == 0)
 398     {
 399       *strp += 7;
 400       mode = 2;
 401     }
 402
 403   errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 404   if (errmsg)
 405     return errmsg;
 406
 407   if (mode)
 408     {
 409       value = * valuep;
 410       if (value == 0)
 411         {
 412           errmsg = _("Attempt to find bit index of 0");
 413           return errmsg;
 414         }
 415
 416       if (mode == 1)
 417         {
 418           count = 31;
 419           while ((value & 0x80000000) == 0)
 420             {
 421               count--;
 422               value <<= 1;
 423             }
 424         }
 425       else if (mode == 2)
 426         {
 427           count = 0;
 428           while ((value & 0x00000001) == 0)
 429             {
 430               count++;
 431               value >>= 1;
 432             }
 433         }
 434
 435       *valuep = count;
 436     }
 437
 438   return errmsg;
 439 }
 440
 441 /* -- dis.c */
 442
 443 const char * ip2k_cgen_parse_operand
 444   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 445
 446 /* Main entry point for operand parsing.
 447
 448    This function is basically just a big switch statement.  Earlier versions
 449    used tables to look up the function to use, but
 450    - if the table contains both assembler and disassembler functions then
 451      the disassembler contains much of the assembler and vice-versa,
 452    - there's a lot of inlining possibilities as things grow,
 453    - using a switch statement avoids the function call overhead.
 454
 455    This function could be moved into `parse_insn_normal', but keeping it
 456    separate makes clear the interface between `parse_insn_normal' and each of
 457    the handlers.  */
 458
 459 const char *
 460 ip2k_cgen_parse_operand (CGEN_CPU_DESC cd,
 461                            int opindex,
 462                            const char ** strp,
 463                            CGEN_FIELDS * fields)
 464 {
 465   const char * errmsg = NULL;
 466   /* Used by scalar operands that still need to be parsed.  */
 467   long junk ATTRIBUTE_UNUSED;
 468
 469   switch (opindex)
 470     {
 471     case IP2K_OPERAND_ADDR16CJP :
 472       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, (unsigned long *) (& fields->f_addr16cjp));
 473       break;
 474     case IP2K_OPERAND_ADDR16H :
 475       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, (unsigned long *) (& fields->f_imm8));
 476       break;
 477     case IP2K_OPERAND_ADDR16L :
 478       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, (unsigned long *) (& fields->f_imm8));
 479       break;
 480     case IP2K_OPERAND_ADDR16P :
 481       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, (unsigned long *) (& fields->f_page3));
 482       break;
 483     case IP2K_OPERAND_BITNO :
 484       errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, (unsigned long *) (& fields->f_bitno));
 485       break;
 486     case IP2K_OPERAND_CBIT :
 487       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, (unsigned long *) (& junk));
 488       break;
 489     case IP2K_OPERAND_DCBIT :
 490       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, (unsigned long *) (& junk));
 491       break;
 492     case IP2K_OPERAND_FR :
 493       errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, (unsigned long *) (& fields->f_reg));
 494       break;
 495     case IP2K_OPERAND_LIT8 :
 496       errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, (long *) (& fields->f_imm8));
 497       break;
 498     case IP2K_OPERAND_PABITS :
 499       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, (unsigned long *) (& junk));
 500       break;
 501     case IP2K_OPERAND_RETI3 :
 502       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, (unsigned long *) (& fields->f_reti3));
 503       break;
 504     case IP2K_OPERAND_ZBIT :
 505       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, (unsigned long *) (& junk));
 506       break;
 507
 508     default :
 509       /* xgettext:c-format */
 510       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 511       abort ();
 512   }
 513
 514   return errmsg;
 515 }
 516
 517 cgen_parse_fn * const ip2k_cgen_parse_handlers[] =
 518 {
 519   parse_insn_normal,
 520 };
 521
 522 void
 523 ip2k_cgen_init_asm (CGEN_CPU_DESC cd)
 524 {
 525   ip2k_cgen_init_opcode_table (cd);
 526   ip2k_cgen_init_ibld_table (cd);
 527   cd->parse_handlers = & ip2k_cgen_parse_handlers[0];
 528   cd->parse_operand = ip2k_cgen_parse_operand;
 529 }
 530
 531 \f
 532
 533 /* Regex construction routine.
 534
 535    This translates an opcode syntax string into a regex string,
 536    by replacing any non-character syntax element (such as an
 537    opcode) with the pattern '.*'
 538
 539    It then compiles the regex and stores it in the opcode, for
 540    later use by ip2k_cgen_assemble_insn
 541
 542    Returns NULL for success, an error message for failure.  */
 543
 544 char *
 545 ip2k_cgen_build_insn_regex (CGEN_INSN *insn)
 546 {
 547   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 548   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 549   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 550   char *rx = rxbuf;
 551   const CGEN_SYNTAX_CHAR_TYPE *syn;
 552   int reg_err;
 553
 554   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 555
 556   /* Mnemonics come first in the syntax string.  */
 557   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 558     return _("missing mnemonic in syntax string");
 559   ++syn;
 560
 561   /* Generate a case sensitive regular expression that emulates case
 562      insensitive matching in the "C" locale.  We cannot generate a case
 563      insensitive regular expression because in Turkish locales, 'i' and 'I'
 564      are not equal modulo case conversion.  */
 565
 566   /* Copy the literal mnemonic out of the insn.  */
 567   for (; *mnem; mnem++)
 568     {
 569       char c = *mnem;
 570
 571       if (ISALPHA (c))
 572         {
 573           *rx++ = '[';
 574           *rx++ = TOLOWER (c);
 575           *rx++ = TOUPPER (c);
 576           *rx++ = ']';
 577         }
 578       else
 579         *rx++ = c;
 580     }
 581
 582   /* Copy any remaining literals from the syntax string into the rx.  */
 583   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 584     {
 585       if (CGEN_SYNTAX_CHAR_P (* syn))
 586         {
 587           char c = CGEN_SYNTAX_CHAR (* syn);
 588
 589           switch (c)
 590             {
 591               /* Escape any regex metacharacters in the syntax.  */
 592             case '.': case '[': case '\\':
 593             case '*': case '^': case '$':
 594
 595 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 596             case '?': case '{': case '}':
 597             case '(': case ')': case '*':
 598             case '|': case '+': case ']':
 599 #endif
 600               *rx++ = '\\';
 601               *rx++ = c;
 602               break;
 603
 604             default:
 605               if (ISALPHA (c))
 606                 {
 607                   *rx++ = '[';
 608                   *rx++ = TOLOWER (c);
 609                   *rx++ = TOUPPER (c);
 610                   *rx++ = ']';
 611                 }
 612               else
 613                 *rx++ = c;
 614               break;
 615             }
 616         }
 617       else
 618         {
 619           /* Replace non-syntax fields with globs.  */
 620           *rx++ = '.';
 621           *rx++ = '*';
 622         }
 623     }
 624
 625   /* Trailing whitespace ok.  */
 626   * rx++ = '[';
 627   * rx++ = ' ';
 628   * rx++ = '\t';
 629   * rx++ = ']';
 630   * rx++ = '*';
 631
 632   /* But anchor it after that.  */
 633   * rx++ = '$';
 634   * rx = '\0';
 635
 636   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 637   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 638
 639   if (reg_err == 0)
 640     return NULL;
 641   else
 642     {
 643       static char msg[80];
 644
 645       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 646       regfree ((regex_t *) CGEN_INSN_RX (insn));
 647       free (CGEN_INSN_RX (insn));
 648       (CGEN_INSN_RX (insn)) = NULL;
 649       return msg;
 650     }
 651 }
 652
 653 \f
 654 /* Default insn parser.
 655
 656    The syntax string is scanned and operands are parsed and stored in FIELDS.
 657    Relocs are queued as we go via other callbacks.
 658
 659    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 660    parse the instruction, we return 0 and the caller will start over from
 661    the beginning.  Backtracking will be necessary in parsing subexpressions,
 662    but that can be handled there.  Not handling backtracking here may get
 663    expensive in the case of the m68k.  Deal with later.
 664
 665    Returns NULL for success, an error message for failure.  */
 666
 667 static const char *
 668 parse_insn_normal (CGEN_CPU_DESC cd,
 669                    const CGEN_INSN *insn,
 670                    const char **strp,
 671                    CGEN_FIELDS *fields)
 672 {
 673   /* ??? Runtime added insns not handled yet.  */
 674   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 675   const char *str = *strp;
 676   const char *errmsg;
 677   const char *p;
 678   const CGEN_SYNTAX_CHAR_TYPE * syn;
 679 #ifdef CGEN_MNEMONIC_OPERANDS
 680   /* FIXME: wip */
 681   int past_opcode_p;
 682 #endif
 683
 684   /* For now we assume the mnemonic is first (there are no leading operands).
 685      We can parse it without needing to set up operand parsing.
 686      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 687      not be called from GAS.  */
 688   p = CGEN_INSN_MNEMONIC (insn);
 689   while (*p && TOLOWER (*p) == TOLOWER (*str))
 690     ++p, ++str;
 691
 692   if (* p)
 693     return _("unrecognized instruction");
 694
 695 #ifndef CGEN_MNEMONIC_OPERANDS
 696   if (* str && ! ISSPACE (* str))
 697     return _("unrecognized instruction");
 698 #endif
 699
 700   CGEN_INIT_PARSE (cd);
 701   cgen_init_parse_operand (cd);
 702 #ifdef CGEN_MNEMONIC_OPERANDS
 703   past_opcode_p = 0;
 704 #endif
 705
 706   /* We don't check for (*str != '\0') here because we want to parse
 707      any trailing fake arguments in the syntax string.  */
 708   syn = CGEN_SYNTAX_STRING (syntax);
 709
 710   /* Mnemonics come first for now, ensure valid string.  */
 711   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 712     abort ();
 713
 714   ++syn;
 715
 716   while (* syn != 0)
 717     {
 718       /* Non operand chars must match exactly.  */
 719       if (CGEN_SYNTAX_CHAR_P (* syn))
 720         {
 721           /* FIXME: While we allow for non-GAS callers above, we assume the
 722              first char after the mnemonic part is a space.  */
 723           /* FIXME: We also take inappropriate advantage of the fact that
 724              GAS's input scrubber will remove extraneous blanks.  */
 725           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 726             {
 727 #ifdef CGEN_MNEMONIC_OPERANDS
 728               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 729                 past_opcode_p = 1;
 730 #endif
 731               ++ syn;
 732               ++ str;
 733             }
 734           else if (*str)
 735             {
 736               /* Syntax char didn't match.  Can't be this insn.  */
 737               static char msg [80];
 738
 739               /* xgettext:c-format */
 740               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 741                        CGEN_SYNTAX_CHAR(*syn), *str);
 742               return msg;
 743             }
 744           else
 745             {
 746               /* Ran out of input.  */
 747               static char msg [80];
 748
 749               /* xgettext:c-format */
 750               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 751                        CGEN_SYNTAX_CHAR(*syn));
 752               return msg;
 753             }
 754           continue;
 755         }
 756
 757       /* We have an operand of some sort.  */
 758       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 759                                           &str, fields);
 760       if (errmsg)
 761         return errmsg;
 762
 763       /* Done with this operand, continue with next one.  */
 764       ++ syn;
 765     }
 766
 767   /* If we're at the end of the syntax string, we're done.  */
 768   if (* syn == 0)
 769     {
 770       /* FIXME: For the moment we assume a valid `str' can only contain
 771          blanks now.  IE: We needn't try again with a longer version of
 772          the insn and it is assumed that longer versions of insns appear
 773          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 774       while (ISSPACE (* str))
 775         ++ str;
 776
 777       if (* str != '\0')
 778         return _("junk at end of line"); /* FIXME: would like to include `str' */
 779
 780       return NULL;
 781     }
 782
 783   /* We couldn't parse it.  */
 784   return _("unrecognized instruction");
 785 }
 786 \f
 787 /* Main entry point.
 788    This routine is called for each instruction to be assembled.
 789    STR points to the insn to be assembled.
 790    We assume all necessary tables have been initialized.
 791    The assembled instruction, less any fixups, is stored in BUF.
 792    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 793    still needs to be converted to target byte order, otherwise BUF is an array
 794    of bytes in target byte order.
 795    The result is a pointer to the insn's entry in the opcode table,
 796    or NULL if an error occured (an error message will have already been
 797    printed).
 798
 799    Note that when processing (non-alias) macro-insns,
 800    this function recurses.
 801
 802    ??? It's possible to make this cpu-independent.
 803    One would have to deal with a few minor things.
 804    At this point in time doing so would be more of a curiosity than useful
 805    [for example this file isn't _that_ big], but keeping the possibility in
 806    mind helps keep the design clean.  */
 807
 808 const CGEN_INSN *
 809 ip2k_cgen_assemble_insn (CGEN_CPU_DESC cd,
 810                            const char *str,
 811                            CGEN_FIELDS *fields,
 812                            CGEN_INSN_BYTES_PTR buf,
 813                            char **errmsg)
 814 {
 815   const char *start;
 816   CGEN_INSN_LIST *ilist;
 817   const char *parse_errmsg = NULL;
 818   const char *insert_errmsg = NULL;
 819   int recognized_mnemonic = 0;
 820
 821   /* Skip leading white space.  */
 822   while (ISSPACE (* str))
 823     ++ str;
 824
 825   /* The instructions are stored in hashed lists.
 826      Get the first in the list.  */
 827   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 828
 829   /* Keep looking until we find a match.  */
 830   start = str;
 831   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 832     {
 833       const CGEN_INSN *insn = ilist->insn;
 834       recognized_mnemonic = 1;
 835
 836 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 837       /* Not usually needed as unsupported opcodes
 838          shouldn't be in the hash lists.  */
 839       /* Is this insn supported by the selected cpu?  */
 840       if (! ip2k_cgen_insn_supported (cd, insn))
 841         continue;
 842 #endif
 843       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 844          chosen immediately.  Instead, it is used during assembler/linker
 845          relaxation if possible.  */
 846       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 847         continue;
 848
 849       str = start;
 850
 851       /* Skip this insn if str doesn't look right lexically.  */
 852       if (CGEN_INSN_RX (insn) != NULL &&
 853           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 854         continue;
 855
 856       /* Allow parse/insert handlers to obtain length of insn.  */
 857       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 858
 859       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 860       if (parse_errmsg != NULL)
 861         continue;
 862
 863       /* ??? 0 is passed for `pc'.  */
 864       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 865                                                  (bfd_vma) 0);
 866       if (insert_errmsg != NULL)
 867         continue;
 868
 869       /* It is up to the caller to actually output the insn and any
 870          queued relocs.  */
 871       return insn;
 872     }
 873
 874   {
 875     static char errbuf[150];
 876 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 877     const char *tmp_errmsg;
 878
 879     /* If requesting verbose error messages, use insert_errmsg.
 880        Failing that, use parse_errmsg.  */
 881     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 882                   parse_errmsg ? parse_errmsg :
 883                   recognized_mnemonic ?
 884                   _("unrecognized form of instruction") :
 885                   _("unrecognized instruction"));
 886
 887     if (strlen (start) > 50)
 888       /* xgettext:c-format */
 889       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 890     else
 891       /* xgettext:c-format */
 892       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 893 #else
 894     if (strlen (start) > 50)
 895       /* xgettext:c-format */
 896       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 897     else
 898       /* xgettext:c-format */
 899       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 900 #endif
 901
 902     *errmsg = errbuf;
 903     return NULL;
 904   }
 905 }