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, 2007, 2008, 2010
   8    Free Software Foundation, Inc.
   9
  10    This file is part of libopcodes.
  11
  12    This library is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3, or (at your option)
  15    any later version.
  16
  17    It is distributed in the hope that it will be useful, but WITHOUT
  18    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  19    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  20    License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software Foundation, Inc.,
  24    51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  25
  26
  27 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  28    Keep that in mind.  */
  29
  30 #include "sysdep.h"
  31 #include <stdio.h>
  32 #include "ansidecl.h"
  33 #include "bfd.h"
  34 #include "symcat.h"
  35 #include "ip2k-desc.h"
  36 #include "ip2k-opc.h"
  37 #include "opintl.h"
  38 #include "xregex.h"
  39 #include "libiberty.h"
  40 #include "safe-ctype.h"
  41
  42 #undef  min
  43 #define min(a,b) ((a) < (b) ? (a) : (b))
  44 #undef  max
  45 #define max(a,b) ((a) > (b) ? (a) : (b))
  46
  47 static const char * parse_insn_normal
  48   (CGEN_CPU_DESC, const CGEN_INSN *, const char **, CGEN_FIELDS *);
  49 \f
  50 /* -- assembler routines inserted here.  */
  51
  52 /* -- asm.c */
  53
  54 static const char *
  55 parse_fr (CGEN_CPU_DESC cd,
  56           const char **strp,
  57           int opindex,
  58           unsigned long *valuep)
  59 {
  60   const char *errmsg;
  61   const char *old_strp;
  62   char *afteroffset;
  63   enum cgen_parse_operand_result result_type;
  64   bfd_vma value;
  65   extern CGEN_KEYWORD ip2k_cgen_opval_register_names;
  66   bfd_vma tempvalue;
  67
  68   old_strp = *strp;
  69   afteroffset = NULL;
  70
  71   /* Check here to see if you're about to try parsing a w as the first arg
  72      and return an error if you are.  */
  73   if ((strncmp (*strp, "w", 1) == 0) || (strncmp (*strp, "W", 1) == 0))
  74     {
  75       (*strp)++;
  76
  77       if ((strncmp (*strp, ",", 1) == 0) || ISSPACE (**strp))
  78         {
  79           /* We've been passed a w.  Return with an error message so that
  80              cgen will try the next parsing option.  */
  81           errmsg = _("W keyword invalid in FR operand slot.");
  82           return errmsg;
  83         }
  84       *strp = old_strp;
  85     }
  86
  87   /* Attempt parse as register keyword. */
  88   errmsg = cgen_parse_keyword (cd, strp, & ip2k_cgen_opval_register_names,
  89                                (long *) valuep);
  90   if (*strp != NULL
  91       && errmsg == NULL)
  92     return errmsg;
  93
  94   /* Attempt to parse for "(IP)".  */
  95   afteroffset = strstr (*strp, "(IP)");
  96
  97   if (afteroffset == NULL)
  98     /* Make sure it's not in lower case.  */
  99     afteroffset = strstr (*strp, "(ip)");
 100
 101   if (afteroffset != NULL)
 102     {
 103       if (afteroffset != *strp)
 104         {
 105           /* Invalid offset present.  */
 106           errmsg = _("offset(IP) is not a valid form");
 107           return errmsg;
 108         }
 109       else
 110         {
 111           *strp += 4;
 112           *valuep = 0;
 113           errmsg = NULL;
 114           return errmsg;
 115         }
 116     }
 117
 118   /* Attempt to parse for DP. ex: mov w, offset(DP)
 119                                   mov offset(DP),w   */
 120
 121   /* Try parsing it as an address and see what comes back.  */
 122   afteroffset = strstr (*strp, "(DP)");
 123
 124   if (afteroffset == NULL)
 125     /* Maybe it's in lower case.  */
 126     afteroffset = strstr (*strp, "(dp)");
 127
 128   if (afteroffset != NULL)
 129     {
 130       if (afteroffset == *strp)
 131         {
 132           /* No offset present. Use 0 by default.  */
 133           tempvalue = 0;
 134           errmsg = NULL;
 135         }
 136       else
 137         errmsg = cgen_parse_address (cd, strp, opindex,
 138                                      BFD_RELOC_IP2K_FR_OFFSET,
 139                                      & result_type, & tempvalue);
 140
 141       if (errmsg == NULL)
 142         {
 143           if (tempvalue <= 127)
 144             {
 145               /* Value is ok.  Fix up the first 2 bits and return.  */
 146               *valuep = 0x0100 | tempvalue;
 147               *strp += 4; /* Skip over the (DP) in *strp.  */
 148               return errmsg;
 149             }
 150           else
 151             {
 152               /* Found something there in front of (DP) but it's out
 153                  of range.  */
 154               errmsg = _("(DP) offset out of range.");
 155               return errmsg;
 156             }
 157         }
 158     }
 159
 160
 161   /* Attempt to parse for SP. ex: mov w, offset(SP)
 162                                   mov offset(SP), w.  */
 163   afteroffset = strstr (*strp, "(SP)");
 164
 165   if (afteroffset == NULL)
 166     /* Maybe it's in lower case.  */
 167     afteroffset = strstr (*strp, "(sp)");
 168
 169   if (afteroffset != NULL)
 170     {
 171       if (afteroffset == *strp)
 172         {
 173           /* No offset present. Use 0 by default.  */
 174           tempvalue = 0;
 175           errmsg = NULL;
 176         }
 177       else
 178         errmsg = cgen_parse_address (cd, strp, opindex,
 179                                      BFD_RELOC_IP2K_FR_OFFSET,
 180                                      & result_type, & tempvalue);
 181
 182       if (errmsg == NULL)
 183         {
 184           if (tempvalue <= 127)
 185             {
 186               /* Value is ok.  Fix up the first 2 bits and return.  */
 187               *valuep = 0x0180 | tempvalue;
 188               *strp += 4; /* Skip over the (SP) in *strp.  */
 189               return errmsg;
 190             }
 191           else
 192             {
 193               /* Found something there in front of (SP) but it's out
 194                  of range.  */
 195               errmsg = _("(SP) offset out of range.");
 196               return errmsg;
 197             }
 198         }
 199     }
 200
 201   /* Attempt to parse as an address.  */
 202   *strp = old_strp;
 203   errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_IP2K_FR9,
 204                                & result_type, & value);
 205   if (errmsg == NULL)
 206     {
 207       *valuep = value;
 208
 209       /* If a parenthesis is found, warn about invalid form.  */
 210       if (**strp == '(')
 211         errmsg = _("illegal use of parentheses");
 212
 213       /* If a numeric value is specified, ensure that it is between
 214          1 and 255.  */
 215       else if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 216         {
 217           if (value < 0x1 || value > 0xff)
 218             errmsg = _("operand out of range (not between 1 and 255)");
 219         }
 220     }
 221   return errmsg;
 222 }
 223
 224 static const char *
 225 parse_addr16 (CGEN_CPU_DESC cd,
 226               const char **strp,
 227               int opindex,
 228               unsigned long *valuep)
 229 {
 230   const char *errmsg;
 231   enum cgen_parse_operand_result result_type;
 232   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 233   bfd_vma value;
 234
 235   if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16H)
 236     code = BFD_RELOC_IP2K_HI8DATA;
 237   else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16L)
 238     code = BFD_RELOC_IP2K_LO8DATA;
 239   else
 240     {
 241       /* Something is very wrong. opindex has to be one of the above.  */
 242       errmsg = _("parse_addr16: invalid opindex.");
 243       return errmsg;
 244     }
 245
 246   errmsg = cgen_parse_address (cd, strp, opindex, code,
 247                                & result_type, & value);
 248   if (errmsg == NULL)
 249     {
 250       /* We either have a relocation or a number now.  */
 251       if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 252         {
 253           /* We got a number back.  */
 254           if (code == BFD_RELOC_IP2K_HI8DATA)
 255             value >>= 8;
 256           else
 257             /* code = BFD_RELOC_IP2K_LOW8DATA.  */
 258             value &= 0x00FF;
 259         }
 260       *valuep = value;
 261     }
 262
 263   return errmsg;
 264 }
 265
 266 static const char *
 267 parse_addr16_cjp (CGEN_CPU_DESC cd,
 268                   const char **strp,
 269                   int opindex,
 270                   unsigned long *valuep)
 271 {
 272   const char *errmsg;
 273   enum cgen_parse_operand_result result_type;
 274   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 275   bfd_vma value;
 276
 277   if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
 278     code = BFD_RELOC_IP2K_ADDR16CJP;
 279   else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
 280     code = BFD_RELOC_IP2K_PAGE3;
 281
 282   errmsg = cgen_parse_address (cd, strp, opindex, code,
 283                                & result_type, & value);
 284   if (errmsg == NULL)
 285     {
 286       if (result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
 287         {
 288           if ((value & 0x1) == 0)  /* If the address is even .... */
 289             {
 290               if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16CJP)
 291                 *valuep = (value >> 1) & 0x1FFF;  /* Should mask be 1FFF?  */
 292               else if (opindex == (CGEN_OPERAND_TYPE) IP2K_OPERAND_ADDR16P)
 293                 *valuep = (value >> 14) & 0x7;
 294             }
 295           else
 296             errmsg = _("Byte address required. - must be even.");
 297         }
 298       else if (result_type == CGEN_PARSE_OPERAND_RESULT_QUEUED)
 299         {
 300           /* This will happen for things like (s2-s1) where s2 and s1
 301              are labels.  */
 302           *valuep = value;
 303         }
 304       else
 305         errmsg = _("cgen_parse_address returned a symbol. Literal required.");
 306     }
 307   return errmsg;
 308 }
 309
 310 static const char *
 311 parse_lit8 (CGEN_CPU_DESC cd,
 312             const char **strp,
 313             int opindex,
 314             long *valuep)
 315 {
 316   const char *errmsg;
 317   enum cgen_parse_operand_result result_type;
 318   bfd_reloc_code_real_type code = BFD_RELOC_NONE;
 319   bfd_vma value;
 320
 321   /* Parse %OP relocating operators.  */
 322   if (strncmp (*strp, "%bank", 5) == 0)
 323     {
 324       *strp += 5;
 325       code = BFD_RELOC_IP2K_BANK;
 326     }
 327   else if (strncmp (*strp, "%lo8data", 8) == 0)
 328     {
 329       *strp += 8;
 330       code = BFD_RELOC_IP2K_LO8DATA;
 331     }
 332   else if (strncmp (*strp, "%hi8data", 8) == 0)
 333     {
 334       *strp += 8;
 335       code = BFD_RELOC_IP2K_HI8DATA;
 336     }
 337   else if (strncmp (*strp, "%ex8data", 8) == 0)
 338     {
 339       *strp += 8;
 340       code = BFD_RELOC_IP2K_EX8DATA;
 341     }
 342   else if (strncmp (*strp, "%lo8insn", 8) == 0)
 343     {
 344       *strp += 8;
 345       code = BFD_RELOC_IP2K_LO8INSN;
 346     }
 347   else if (strncmp (*strp, "%hi8insn", 8) == 0)
 348     {
 349       *strp += 8;
 350       code = BFD_RELOC_IP2K_HI8INSN;
 351     }
 352
 353   /* Parse %op operand.  */
 354   if (code != BFD_RELOC_NONE)
 355     {
 356       errmsg = cgen_parse_address (cd, strp, opindex, code,
 357                                    & result_type, & value);
 358       if ((errmsg == NULL) &&
 359           (result_type != CGEN_PARSE_OPERAND_RESULT_QUEUED))
 360         errmsg = _("percent-operator operand is not a symbol");
 361
 362       *valuep = value;
 363     }
 364   /* Parse as a number.  */
 365   else
 366     {
 367       errmsg = cgen_parse_signed_integer (cd, strp, opindex, valuep);
 368
 369       /* Truncate to eight bits to accept both signed and unsigned input.  */
 370       if (errmsg == NULL)
 371         *valuep &= 0xFF;
 372     }
 373
 374   return errmsg;
 375 }
 376
 377 static const char *
 378 parse_bit3 (CGEN_CPU_DESC cd,
 379             const char **strp,
 380             int opindex,
 381             unsigned long *valuep)
 382 {
 383   const char *errmsg;
 384   char mode = 0;
 385   long count = 0;
 386   unsigned long value;
 387
 388   if (strncmp (*strp, "%bit", 4) == 0)
 389     {
 390       *strp += 4;
 391       mode = 1;
 392     }
 393   else if (strncmp (*strp, "%msbbit", 7) == 0)
 394     {
 395       *strp += 7;
 396       mode = 1;
 397     }
 398   else if (strncmp (*strp, "%lsbbit", 7) == 0)
 399     {
 400       *strp += 7;
 401       mode = 2;
 402     }
 403
 404   errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, valuep);
 405   if (errmsg)
 406     return errmsg;
 407
 408   if (mode)
 409     {
 410       value = * valuep;
 411       if (value == 0)
 412         {
 413           errmsg = _("Attempt to find bit index of 0");
 414           return errmsg;
 415         }
 416
 417       if (mode == 1)
 418         {
 419           count = 31;
 420           while ((value & 0x80000000) == 0)
 421             {
 422               count--;
 423               value <<= 1;
 424             }
 425         }
 426       else if (mode == 2)
 427         {
 428           count = 0;
 429           while ((value & 0x00000001) == 0)
 430             {
 431               count++;
 432               value >>= 1;
 433             }
 434         }
 435
 436       *valuep = count;
 437     }
 438
 439   return errmsg;
 440 }
 441
 442 /* -- dis.c */
 443
 444 const char * ip2k_cgen_parse_operand
 445   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 446
 447 /* Main entry point for operand parsing.
 448
 449    This function is basically just a big switch statement.  Earlier versions
 450    used tables to look up the function to use, but
 451    - if the table contains both assembler and disassembler functions then
 452      the disassembler contains much of the assembler and vice-versa,
 453    - there's a lot of inlining possibilities as things grow,
 454    - using a switch statement avoids the function call overhead.
 455
 456    This function could be moved into `parse_insn_normal', but keeping it
 457    separate makes clear the interface between `parse_insn_normal' and each of
 458    the handlers.  */
 459
 460 const char *
 461 ip2k_cgen_parse_operand (CGEN_CPU_DESC cd,
 462                            int opindex,
 463                            const char ** strp,
 464                            CGEN_FIELDS * fields)
 465 {
 466   const char * errmsg = NULL;
 467   /* Used by scalar operands that still need to be parsed.  */
 468   long junk ATTRIBUTE_UNUSED;
 469
 470   switch (opindex)
 471     {
 472     case IP2K_OPERAND_ADDR16CJP :
 473       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16CJP, (unsigned long *) (& fields->f_addr16cjp));
 474       break;
 475     case IP2K_OPERAND_ADDR16H :
 476       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16H, (unsigned long *) (& fields->f_imm8));
 477       break;
 478     case IP2K_OPERAND_ADDR16L :
 479       errmsg = parse_addr16 (cd, strp, IP2K_OPERAND_ADDR16L, (unsigned long *) (& fields->f_imm8));
 480       break;
 481     case IP2K_OPERAND_ADDR16P :
 482       errmsg = parse_addr16_cjp (cd, strp, IP2K_OPERAND_ADDR16P, (unsigned long *) (& fields->f_page3));
 483       break;
 484     case IP2K_OPERAND_BITNO :
 485       errmsg = parse_bit3 (cd, strp, IP2K_OPERAND_BITNO, (unsigned long *) (& fields->f_bitno));
 486       break;
 487     case IP2K_OPERAND_CBIT :
 488       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_CBIT, (unsigned long *) (& junk));
 489       break;
 490     case IP2K_OPERAND_DCBIT :
 491       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_DCBIT, (unsigned long *) (& junk));
 492       break;
 493     case IP2K_OPERAND_FR :
 494       errmsg = parse_fr (cd, strp, IP2K_OPERAND_FR, (unsigned long *) (& fields->f_reg));
 495       break;
 496     case IP2K_OPERAND_LIT8 :
 497       errmsg = parse_lit8 (cd, strp, IP2K_OPERAND_LIT8, (long *) (& fields->f_imm8));
 498       break;
 499     case IP2K_OPERAND_PABITS :
 500       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_PABITS, (unsigned long *) (& junk));
 501       break;
 502     case IP2K_OPERAND_RETI3 :
 503       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_RETI3, (unsigned long *) (& fields->f_reti3));
 504       break;
 505     case IP2K_OPERAND_ZBIT :
 506       errmsg = cgen_parse_unsigned_integer (cd, strp, IP2K_OPERAND_ZBIT, (unsigned long *) (& junk));
 507       break;
 508
 509     default :
 510       /* xgettext:c-format */
 511       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 512       abort ();
 513   }
 514
 515   return errmsg;
 516 }
 517
 518 cgen_parse_fn * const ip2k_cgen_parse_handlers[] =
 519 {
 520   parse_insn_normal,
 521 };
 522
 523 void
 524 ip2k_cgen_init_asm (CGEN_CPU_DESC cd)
 525 {
 526   ip2k_cgen_init_opcode_table (cd);
 527   ip2k_cgen_init_ibld_table (cd);
 528   cd->parse_handlers = & ip2k_cgen_parse_handlers[0];
 529   cd->parse_operand = ip2k_cgen_parse_operand;
 530 #ifdef CGEN_ASM_INIT_HOOK
 531 CGEN_ASM_INIT_HOOK
 532 #endif
 533 }
 534
 535 \f
 536
 537 /* Regex construction routine.
 538
 539    This translates an opcode syntax string into a regex string,
 540    by replacing any non-character syntax element (such as an
 541    opcode) with the pattern '.*'
 542
 543    It then compiles the regex and stores it in the opcode, for
 544    later use by ip2k_cgen_assemble_insn
 545
 546    Returns NULL for success, an error message for failure.  */
 547
 548 char *
 549 ip2k_cgen_build_insn_regex (CGEN_INSN *insn)
 550 {
 551   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 552   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 553   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 554   char *rx = rxbuf;
 555   const CGEN_SYNTAX_CHAR_TYPE *syn;
 556   int reg_err;
 557
 558   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 559
 560   /* Mnemonics come first in the syntax string.  */
 561   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 562     return _("missing mnemonic in syntax string");
 563   ++syn;
 564
 565   /* Generate a case sensitive regular expression that emulates case
 566      insensitive matching in the "C" locale.  We cannot generate a case
 567      insensitive regular expression because in Turkish locales, 'i' and 'I'
 568      are not equal modulo case conversion.  */
 569
 570   /* Copy the literal mnemonic out of the insn.  */
 571   for (; *mnem; mnem++)
 572     {
 573       char c = *mnem;
 574
 575       if (ISALPHA (c))
 576         {
 577           *rx++ = '[';
 578           *rx++ = TOLOWER (c);
 579           *rx++ = TOUPPER (c);
 580           *rx++ = ']';
 581         }
 582       else
 583         *rx++ = c;
 584     }
 585
 586   /* Copy any remaining literals from the syntax string into the rx.  */
 587   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 588     {
 589       if (CGEN_SYNTAX_CHAR_P (* syn))
 590         {
 591           char c = CGEN_SYNTAX_CHAR (* syn);
 592
 593           switch (c)
 594             {
 595               /* Escape any regex metacharacters in the syntax.  */
 596             case '.': case '[': case '\\':
 597             case '*': case '^': case '$':
 598
 599 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 600             case '?': case '{': case '}':
 601             case '(': case ')': case '*':
 602             case '|': case '+': case ']':
 603 #endif
 604               *rx++ = '\\';
 605               *rx++ = c;
 606               break;
 607
 608             default:
 609               if (ISALPHA (c))
 610                 {
 611                   *rx++ = '[';
 612                   *rx++ = TOLOWER (c);
 613                   *rx++ = TOUPPER (c);
 614                   *rx++ = ']';
 615                 }
 616               else
 617                 *rx++ = c;
 618               break;
 619             }
 620         }
 621       else
 622         {
 623           /* Replace non-syntax fields with globs.  */
 624           *rx++ = '.';
 625           *rx++ = '*';
 626         }
 627     }
 628
 629   /* Trailing whitespace ok.  */
 630   * rx++ = '[';
 631   * rx++ = ' ';
 632   * rx++ = '\t';
 633   * rx++ = ']';
 634   * rx++ = '*';
 635
 636   /* But anchor it after that.  */
 637   * rx++ = '$';
 638   * rx = '\0';
 639
 640   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 641   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 642
 643   if (reg_err == 0)
 644     return NULL;
 645   else
 646     {
 647       static char msg[80];
 648
 649       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 650       regfree ((regex_t *) CGEN_INSN_RX (insn));
 651       free (CGEN_INSN_RX (insn));
 652       (CGEN_INSN_RX (insn)) = NULL;
 653       return msg;
 654     }
 655 }
 656
 657 \f
 658 /* Default insn parser.
 659
 660    The syntax string is scanned and operands are parsed and stored in FIELDS.
 661    Relocs are queued as we go via other callbacks.
 662
 663    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 664    parse the instruction, we return 0 and the caller will start over from
 665    the beginning.  Backtracking will be necessary in parsing subexpressions,
 666    but that can be handled there.  Not handling backtracking here may get
 667    expensive in the case of the m68k.  Deal with later.
 668
 669    Returns NULL for success, an error message for failure.  */
 670
 671 static const char *
 672 parse_insn_normal (CGEN_CPU_DESC cd,
 673                    const CGEN_INSN *insn,
 674                    const char **strp,
 675                    CGEN_FIELDS *fields)
 676 {
 677   /* ??? Runtime added insns not handled yet.  */
 678   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 679   const char *str = *strp;
 680   const char *errmsg;
 681   const char *p;
 682   const CGEN_SYNTAX_CHAR_TYPE * syn;
 683 #ifdef CGEN_MNEMONIC_OPERANDS
 684   /* FIXME: wip */
 685   int past_opcode_p;
 686 #endif
 687
 688   /* For now we assume the mnemonic is first (there are no leading operands).
 689      We can parse it without needing to set up operand parsing.
 690      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 691      not be called from GAS.  */
 692   p = CGEN_INSN_MNEMONIC (insn);
 693   while (*p && TOLOWER (*p) == TOLOWER (*str))
 694     ++p, ++str;
 695
 696   if (* p)
 697     return _("unrecognized instruction");
 698
 699 #ifndef CGEN_MNEMONIC_OPERANDS
 700   if (* str && ! ISSPACE (* str))
 701     return _("unrecognized instruction");
 702 #endif
 703
 704   CGEN_INIT_PARSE (cd);
 705   cgen_init_parse_operand (cd);
 706 #ifdef CGEN_MNEMONIC_OPERANDS
 707   past_opcode_p = 0;
 708 #endif
 709
 710   /* We don't check for (*str != '\0') here because we want to parse
 711      any trailing fake arguments in the syntax string.  */
 712   syn = CGEN_SYNTAX_STRING (syntax);
 713
 714   /* Mnemonics come first for now, ensure valid string.  */
 715   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 716     abort ();
 717
 718   ++syn;
 719
 720   while (* syn != 0)
 721     {
 722       /* Non operand chars must match exactly.  */
 723       if (CGEN_SYNTAX_CHAR_P (* syn))
 724         {
 725           /* FIXME: While we allow for non-GAS callers above, we assume the
 726              first char after the mnemonic part is a space.  */
 727           /* FIXME: We also take inappropriate advantage of the fact that
 728              GAS's input scrubber will remove extraneous blanks.  */
 729           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 730             {
 731 #ifdef CGEN_MNEMONIC_OPERANDS
 732               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 733                 past_opcode_p = 1;
 734 #endif
 735               ++ syn;
 736               ++ str;
 737             }
 738           else if (*str)
 739             {
 740               /* Syntax char didn't match.  Can't be this insn.  */
 741               static char msg [80];
 742
 743               /* xgettext:c-format */
 744               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 745                        CGEN_SYNTAX_CHAR(*syn), *str);
 746               return msg;
 747             }
 748           else
 749             {
 750               /* Ran out of input.  */
 751               static char msg [80];
 752
 753               /* xgettext:c-format */
 754               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 755                        CGEN_SYNTAX_CHAR(*syn));
 756               return msg;
 757             }
 758           continue;
 759         }
 760
 761       /* We have an operand of some sort.  */
 762       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 763                                           &str, fields);
 764       if (errmsg)
 765         return errmsg;
 766
 767       /* Done with this operand, continue with next one.  */
 768       ++ syn;
 769     }
 770
 771   /* If we're at the end of the syntax string, we're done.  */
 772   if (* syn == 0)
 773     {
 774       /* FIXME: For the moment we assume a valid `str' can only contain
 775          blanks now.  IE: We needn't try again with a longer version of
 776          the insn and it is assumed that longer versions of insns appear
 777          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 778       while (ISSPACE (* str))
 779         ++ str;
 780
 781       if (* str != '\0')
 782         return _("junk at end of line"); /* FIXME: would like to include `str' */
 783
 784       return NULL;
 785     }
 786
 787   /* We couldn't parse it.  */
 788   return _("unrecognized instruction");
 789 }
 790 \f
 791 /* Main entry point.
 792    This routine is called for each instruction to be assembled.
 793    STR points to the insn to be assembled.
 794    We assume all necessary tables have been initialized.
 795    The assembled instruction, less any fixups, is stored in BUF.
 796    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 797    still needs to be converted to target byte order, otherwise BUF is an array
 798    of bytes in target byte order.
 799    The result is a pointer to the insn's entry in the opcode table,
 800    or NULL if an error occured (an error message will have already been
 801    printed).
 802
 803    Note that when processing (non-alias) macro-insns,
 804    this function recurses.
 805
 806    ??? It's possible to make this cpu-independent.
 807    One would have to deal with a few minor things.
 808    At this point in time doing so would be more of a curiosity than useful
 809    [for example this file isn't _that_ big], but keeping the possibility in
 810    mind helps keep the design clean.  */
 811
 812 const CGEN_INSN *
 813 ip2k_cgen_assemble_insn (CGEN_CPU_DESC cd,
 814                            const char *str,
 815                            CGEN_FIELDS *fields,
 816                            CGEN_INSN_BYTES_PTR buf,
 817                            char **errmsg)
 818 {
 819   const char *start;
 820   CGEN_INSN_LIST *ilist;
 821   const char *parse_errmsg = NULL;
 822   const char *insert_errmsg = NULL;
 823   int recognized_mnemonic = 0;
 824
 825   /* Skip leading white space.  */
 826   while (ISSPACE (* str))
 827     ++ str;
 828
 829   /* The instructions are stored in hashed lists.
 830      Get the first in the list.  */
 831   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 832
 833   /* Keep looking until we find a match.  */
 834   start = str;
 835   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 836     {
 837       const CGEN_INSN *insn = ilist->insn;
 838       recognized_mnemonic = 1;
 839
 840 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 841       /* Not usually needed as unsupported opcodes
 842          shouldn't be in the hash lists.  */
 843       /* Is this insn supported by the selected cpu?  */
 844       if (! ip2k_cgen_insn_supported (cd, insn))
 845         continue;
 846 #endif
 847       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 848          chosen immediately.  Instead, it is used during assembler/linker
 849          relaxation if possible.  */
 850       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 851         continue;
 852
 853       str = start;
 854
 855       /* Skip this insn if str doesn't look right lexically.  */
 856       if (CGEN_INSN_RX (insn) != NULL &&
 857           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 858         continue;
 859
 860       /* Allow parse/insert handlers to obtain length of insn.  */
 861       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 862
 863       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 864       if (parse_errmsg != NULL)
 865         continue;
 866
 867       /* ??? 0 is passed for `pc'.  */
 868       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 869                                                  (bfd_vma) 0);
 870       if (insert_errmsg != NULL)
 871         continue;
 872
 873       /* It is up to the caller to actually output the insn and any
 874          queued relocs.  */
 875       return insn;
 876     }
 877
 878   {
 879     static char errbuf[150];
 880 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 881     const char *tmp_errmsg;
 882
 883     /* If requesting verbose error messages, use insert_errmsg.
 884        Failing that, use parse_errmsg.  */
 885     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 886                   parse_errmsg ? parse_errmsg :
 887                   recognized_mnemonic ?
 888                   _("unrecognized form of instruction") :
 889                   _("unrecognized instruction"));
 890
 891     if (strlen (start) > 50)
 892       /* xgettext:c-format */
 893       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 894     else
 895       /* xgettext:c-format */
 896       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 897 #else
 898     if (strlen (start) > 50)
 899       /* xgettext:c-format */
 900       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 901     else
 902       /* xgettext:c-format */
 903       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 904 #endif
 905
 906     *errmsg = errbuf;
 907     return NULL;
 908   }
 909 }