opcodes/xc16x-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 "xc16x-desc.h"
  35 #include "xc16x-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 /* Handle '#' prefixes (i.e. skip over them).  */
  53
  54 static const char *
  55 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  56             const char **strp,
  57             int opindex ATTRIBUTE_UNUSED,
  58             long *valuep ATTRIBUTE_UNUSED)
  59 {
  60   if (**strp == '#')
  61     {
  62       ++*strp;
  63       return NULL;
  64     }
  65   return _("Missing '#' prefix");
  66 }
  67
  68 /* Handle '.' prefixes (i.e. skip over them).  */
  69
  70 static const char *
  71 parse_dot (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  72            const char **strp,
  73            int opindex ATTRIBUTE_UNUSED,
  74            long *valuep ATTRIBUTE_UNUSED)
  75 {
  76   if (**strp == '.')
  77     {
  78       ++*strp;
  79       return NULL;
  80     }
  81   return _("Missing '.' prefix");
  82 }
  83
  84 /* Handle 'pof:' prefixes (i.e. skip over them).  */
  85
  86 static const char *
  87 parse_pof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  88            const char **strp,
  89            int opindex ATTRIBUTE_UNUSED,
  90            long *valuep ATTRIBUTE_UNUSED)
  91 {
  92   if (strncasecmp (*strp, "pof:", 4) == 0)
  93     {
  94       *strp += 4;
  95       return NULL;
  96     }
  97   return _("Missing 'pof:' prefix");
  98 }
  99
 100 /* Handle 'pag:' prefixes (i.e. skip over them).  */
 101
 102 static const char *
 103 parse_pag (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 104            const char **strp,
 105            int opindex ATTRIBUTE_UNUSED,
 106            long *valuep ATTRIBUTE_UNUSED)
 107 {
 108   if (strncasecmp (*strp, "pag:", 4) == 0)
 109     {
 110       *strp += 4;
 111       return NULL;
 112     }
 113   return _("Missing 'pag:' prefix");
 114 }
 115
 116 /* Handle 'sof' prefixes (i.e. skip over them).  */
 117
 118 static const char *
 119 parse_sof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 120            const char **strp,
 121            int opindex ATTRIBUTE_UNUSED,
 122            long *valuep ATTRIBUTE_UNUSED)
 123 {
 124   if (strncasecmp (*strp, "sof:", 4) == 0)
 125     {
 126       *strp += 4;
 127       return NULL;
 128     }
 129   return _("Missing 'sof:' prefix");
 130 }
 131
 132 /* Handle 'seg' prefixes (i.e. skip over them).  */
 133
 134 static const char *
 135 parse_seg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 136            const char **strp,
 137            int opindex ATTRIBUTE_UNUSED,
 138            long *valuep ATTRIBUTE_UNUSED)
 139 {
 140   if (strncasecmp (*strp, "seg:", 4) == 0)
 141     {
 142       *strp += 4;
 143       return NULL;
 144     }
 145   return _("Missing 'seg:' prefix");
 146 }
 147 /* -- */
 148
 149 const char * xc16x_cgen_parse_operand
 150   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 151
 152 /* Main entry point for operand parsing.
 153
 154    This function is basically just a big switch statement.  Earlier versions
 155    used tables to look up the function to use, but
 156    - if the table contains both assembler and disassembler functions then
 157      the disassembler contains much of the assembler and vice-versa,
 158    - there's a lot of inlining possibilities as things grow,
 159    - using a switch statement avoids the function call overhead.
 160
 161    This function could be moved into `parse_insn_normal', but keeping it
 162    separate makes clear the interface between `parse_insn_normal' and each of
 163    the handlers.  */
 164
 165 const char *
 166 xc16x_cgen_parse_operand (CGEN_CPU_DESC cd,
 167                            int opindex,
 168                            const char ** strp,
 169                            CGEN_FIELDS * fields)
 170 {
 171   const char * errmsg = NULL;
 172   /* Used by scalar operands that still need to be parsed.  */
 173   long junk ATTRIBUTE_UNUSED;
 174
 175   switch (opindex)
 176     {
 177     case XC16X_OPERAND_REGNAM :
 178       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_psw_names, & fields->f_reg8);
 179       break;
 180     case XC16X_OPERAND_BIT01 :
 181       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT01, (unsigned long *) (& fields->f_op_1bit));
 182       break;
 183     case XC16X_OPERAND_BIT1 :
 184       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT1, (unsigned long *) (& fields->f_op_bit1));
 185       break;
 186     case XC16X_OPERAND_BIT2 :
 187       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT2, (unsigned long *) (& fields->f_op_bit2));
 188       break;
 189     case XC16X_OPERAND_BIT4 :
 190       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT4, (unsigned long *) (& fields->f_op_bit4));
 191       break;
 192     case XC16X_OPERAND_BIT8 :
 193       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT8, (unsigned long *) (& fields->f_op_bit8));
 194       break;
 195     case XC16X_OPERAND_BITONE :
 196       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BITONE, (unsigned long *) (& fields->f_op_onebit));
 197       break;
 198     case XC16X_OPERAND_CADDR :
 199       {
 200         bfd_vma value = 0;
 201         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_CADDR, 0, NULL,  & value);
 202         fields->f_offset16 = value;
 203       }
 204       break;
 205     case XC16X_OPERAND_COND :
 206       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_condcode);
 207       break;
 208     case XC16X_OPERAND_DATA8 :
 209       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATA8, (unsigned long *) (& fields->f_data8));
 210       break;
 211     case XC16X_OPERAND_DATAHI8 :
 212       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATAHI8, (unsigned long *) (& fields->f_datahi8));
 213       break;
 214     case XC16X_OPERAND_DOT :
 215       errmsg = parse_dot (cd, strp, XC16X_OPERAND_DOT, (long *) (& junk));
 216       break;
 217     case XC16X_OPERAND_DR :
 218       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
 219       break;
 220     case XC16X_OPERAND_DRB :
 221       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r1);
 222       break;
 223     case XC16X_OPERAND_DRI :
 224       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r4);
 225       break;
 226     case XC16X_OPERAND_EXTCOND :
 227       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_extconditioncode_names, & fields->f_extccode);
 228       break;
 229     case XC16X_OPERAND_GENREG :
 230       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regb8);
 231       break;
 232     case XC16X_OPERAND_HASH :
 233       errmsg = parse_hash (cd, strp, XC16X_OPERAND_HASH, (long *) (& junk));
 234       break;
 235     case XC16X_OPERAND_ICOND :
 236       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_icondcode);
 237       break;
 238     case XC16X_OPERAND_LBIT2 :
 239       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT2, (unsigned long *) (& fields->f_op_lbit2));
 240       break;
 241     case XC16X_OPERAND_LBIT4 :
 242       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT4, (unsigned long *) (& fields->f_op_lbit4));
 243       break;
 244     case XC16X_OPERAND_MASK8 :
 245       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASK8, (unsigned long *) (& fields->f_mask8));
 246       break;
 247     case XC16X_OPERAND_MASKLO8 :
 248       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASKLO8, (unsigned long *) (& fields->f_datahi8));
 249       break;
 250     case XC16X_OPERAND_MEMGR8 :
 251       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_memgr8_names, & fields->f_memgr8);
 252       break;
 253     case XC16X_OPERAND_MEMORY :
 254       {
 255         bfd_vma value = 0;
 256         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_MEMORY, 0, NULL,  & value);
 257         fields->f_memory = value;
 258       }
 259       break;
 260     case XC16X_OPERAND_PAG :
 261       errmsg = parse_pag (cd, strp, XC16X_OPERAND_PAG, (long *) (& junk));
 262       break;
 263     case XC16X_OPERAND_PAGENUM :
 264       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_PAGENUM, (unsigned long *) (& fields->f_pagenum));
 265       break;
 266     case XC16X_OPERAND_POF :
 267       errmsg = parse_pof (cd, strp, XC16X_OPERAND_POF, (long *) (& junk));
 268       break;
 269     case XC16X_OPERAND_QBIT :
 270       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QBIT, (unsigned long *) (& fields->f_qbit));
 271       break;
 272     case XC16X_OPERAND_QHIBIT :
 273       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QHIBIT, (unsigned long *) (& fields->f_qhibit));
 274       break;
 275     case XC16X_OPERAND_QLOBIT :
 276       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QLOBIT, (unsigned long *) (& fields->f_qlobit));
 277       break;
 278     case XC16X_OPERAND_REG8 :
 279       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reg8);
 280       break;
 281     case XC16X_OPERAND_REGB8 :
 282       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb8_names, & fields->f_regb8);
 283       break;
 284     case XC16X_OPERAND_REGBMEM8 :
 285       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regbmem8_names, & fields->f_regmem8);
 286       break;
 287     case XC16X_OPERAND_REGHI8 :
 288       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reghi8);
 289       break;
 290     case XC16X_OPERAND_REGMEM8 :
 291       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regmem8_names, & fields->f_regmem8);
 292       break;
 293     case XC16X_OPERAND_REGOFF8 :
 294       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regoff8);
 295       break;
 296     case XC16X_OPERAND_REL :
 297       errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_REL, (long *) (& fields->f_rel8));
 298       break;
 299     case XC16X_OPERAND_RELHI :
 300       errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_RELHI, (long *) (& fields->f_relhi8));
 301       break;
 302     case XC16X_OPERAND_SEG :
 303       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEG, (unsigned long *) (& fields->f_seg8));
 304       break;
 305     case XC16X_OPERAND_SEGHI8 :
 306       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEGHI8, (unsigned long *) (& fields->f_segnum8));
 307       break;
 308     case XC16X_OPERAND_SEGM :
 309       errmsg = parse_seg (cd, strp, XC16X_OPERAND_SEGM, (long *) (& junk));
 310       break;
 311     case XC16X_OPERAND_SOF :
 312       errmsg = parse_sof (cd, strp, XC16X_OPERAND_SOF, (long *) (& junk));
 313       break;
 314     case XC16X_OPERAND_SR :
 315       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
 316       break;
 317     case XC16X_OPERAND_SR2 :
 318       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r0);
 319       break;
 320     case XC16X_OPERAND_SRB :
 321       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r2);
 322       break;
 323     case XC16X_OPERAND_SRC1 :
 324       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
 325       break;
 326     case XC16X_OPERAND_SRC2 :
 327       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
 328       break;
 329     case XC16X_OPERAND_SRDIV :
 330       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regdiv8_names, & fields->f_reg8);
 331       break;
 332     case XC16X_OPERAND_U4 :
 333       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name, & fields->f_uimm4);
 334       break;
 335     case XC16X_OPERAND_UIMM16 :
 336       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
 337       break;
 338     case XC16X_OPERAND_UIMM2 :
 339       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_ext_names, & fields->f_uimm2);
 340       break;
 341     case XC16X_OPERAND_UIMM3 :
 342       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name1, & fields->f_uimm3);
 343       break;
 344     case XC16X_OPERAND_UIMM4 :
 345       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
 346       break;
 347     case XC16X_OPERAND_UIMM7 :
 348       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM7, (unsigned long *) (& fields->f_uimm7));
 349       break;
 350     case XC16X_OPERAND_UIMM8 :
 351       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
 352       break;
 353     case XC16X_OPERAND_UPAG16 :
 354       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UPAG16, (unsigned long *) (& fields->f_uimm16));
 355       break;
 356     case XC16X_OPERAND_UPOF16 :
 357       {
 358         bfd_vma value = 0;
 359         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_UPOF16, 0, NULL,  & value);
 360         fields->f_memory = value;
 361       }
 362       break;
 363     case XC16X_OPERAND_USEG16 :
 364       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG16, (unsigned long *) (& fields->f_offset16));
 365       break;
 366     case XC16X_OPERAND_USEG8 :
 367       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG8, (unsigned long *) (& fields->f_seg8));
 368       break;
 369     case XC16X_OPERAND_USOF16 :
 370       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USOF16, (unsigned long *) (& fields->f_offset16));
 371       break;
 372
 373     default :
 374       /* xgettext:c-format */
 375       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 376       abort ();
 377   }
 378
 379   return errmsg;
 380 }
 381
 382 cgen_parse_fn * const xc16x_cgen_parse_handlers[] =
 383 {
 384   parse_insn_normal,
 385 };
 386
 387 void
 388 xc16x_cgen_init_asm (CGEN_CPU_DESC cd)
 389 {
 390   xc16x_cgen_init_opcode_table (cd);
 391   xc16x_cgen_init_ibld_table (cd);
 392   cd->parse_handlers = & xc16x_cgen_parse_handlers[0];
 393   cd->parse_operand = xc16x_cgen_parse_operand;
 394 }
 395
 396 \f
 397
 398 /* Regex construction routine.
 399
 400    This translates an opcode syntax string into a regex string,
 401    by replacing any non-character syntax element (such as an
 402    opcode) with the pattern '.*'
 403
 404    It then compiles the regex and stores it in the opcode, for
 405    later use by xc16x_cgen_assemble_insn
 406
 407    Returns NULL for success, an error message for failure.  */
 408
 409 char *
 410 xc16x_cgen_build_insn_regex (CGEN_INSN *insn)
 411 {
 412   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 413   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 414   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 415   char *rx = rxbuf;
 416   const CGEN_SYNTAX_CHAR_TYPE *syn;
 417   int reg_err;
 418
 419   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 420
 421   /* Mnemonics come first in the syntax string.  */
 422   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 423     return _("missing mnemonic in syntax string");
 424   ++syn;
 425
 426   /* Generate a case sensitive regular expression that emulates case
 427      insensitive matching in the "C" locale.  We cannot generate a case
 428      insensitive regular expression because in Turkish locales, 'i' and 'I'
 429      are not equal modulo case conversion.  */
 430
 431   /* Copy the literal mnemonic out of the insn.  */
 432   for (; *mnem; mnem++)
 433     {
 434       char c = *mnem;
 435
 436       if (ISALPHA (c))
 437         {
 438           *rx++ = '[';
 439           *rx++ = TOLOWER (c);
 440           *rx++ = TOUPPER (c);
 441           *rx++ = ']';
 442         }
 443       else
 444         *rx++ = c;
 445     }
 446
 447   /* Copy any remaining literals from the syntax string into the rx.  */
 448   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 449     {
 450       if (CGEN_SYNTAX_CHAR_P (* syn))
 451         {
 452           char c = CGEN_SYNTAX_CHAR (* syn);
 453
 454           switch (c)
 455             {
 456               /* Escape any regex metacharacters in the syntax.  */
 457             case '.': case '[': case '\\':
 458             case '*': case '^': case '$':
 459
 460 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 461             case '?': case '{': case '}':
 462             case '(': case ')': case '*':
 463             case '|': case '+': case ']':
 464 #endif
 465               *rx++ = '\\';
 466               *rx++ = c;
 467               break;
 468
 469             default:
 470               if (ISALPHA (c))
 471                 {
 472                   *rx++ = '[';
 473                   *rx++ = TOLOWER (c);
 474                   *rx++ = TOUPPER (c);
 475                   *rx++ = ']';
 476                 }
 477               else
 478                 *rx++ = c;
 479               break;
 480             }
 481         }
 482       else
 483         {
 484           /* Replace non-syntax fields with globs.  */
 485           *rx++ = '.';
 486           *rx++ = '*';
 487         }
 488     }
 489
 490   /* Trailing whitespace ok.  */
 491   * rx++ = '[';
 492   * rx++ = ' ';
 493   * rx++ = '\t';
 494   * rx++ = ']';
 495   * rx++ = '*';
 496
 497   /* But anchor it after that.  */
 498   * rx++ = '$';
 499   * rx = '\0';
 500
 501   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 502   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 503
 504   if (reg_err == 0)
 505     return NULL;
 506   else
 507     {
 508       static char msg[80];
 509
 510       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 511       regfree ((regex_t *) CGEN_INSN_RX (insn));
 512       free (CGEN_INSN_RX (insn));
 513       (CGEN_INSN_RX (insn)) = NULL;
 514       return msg;
 515     }
 516 }
 517
 518 \f
 519 /* Default insn parser.
 520
 521    The syntax string is scanned and operands are parsed and stored in FIELDS.
 522    Relocs are queued as we go via other callbacks.
 523
 524    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 525    parse the instruction, we return 0 and the caller will start over from
 526    the beginning.  Backtracking will be necessary in parsing subexpressions,
 527    but that can be handled there.  Not handling backtracking here may get
 528    expensive in the case of the m68k.  Deal with later.
 529
 530    Returns NULL for success, an error message for failure.  */
 531
 532 static const char *
 533 parse_insn_normal (CGEN_CPU_DESC cd,
 534                    const CGEN_INSN *insn,
 535                    const char **strp,
 536                    CGEN_FIELDS *fields)
 537 {
 538   /* ??? Runtime added insns not handled yet.  */
 539   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 540   const char *str = *strp;
 541   const char *errmsg;
 542   const char *p;
 543   const CGEN_SYNTAX_CHAR_TYPE * syn;
 544 #ifdef CGEN_MNEMONIC_OPERANDS
 545   /* FIXME: wip */
 546   int past_opcode_p;
 547 #endif
 548
 549   /* For now we assume the mnemonic is first (there are no leading operands).
 550      We can parse it without needing to set up operand parsing.
 551      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 552      not be called from GAS.  */
 553   p = CGEN_INSN_MNEMONIC (insn);
 554   while (*p && TOLOWER (*p) == TOLOWER (*str))
 555     ++p, ++str;
 556
 557   if (* p)
 558     return _("unrecognized instruction");
 559
 560 #ifndef CGEN_MNEMONIC_OPERANDS
 561   if (* str && ! ISSPACE (* str))
 562     return _("unrecognized instruction");
 563 #endif
 564
 565   CGEN_INIT_PARSE (cd);
 566   cgen_init_parse_operand (cd);
 567 #ifdef CGEN_MNEMONIC_OPERANDS
 568   past_opcode_p = 0;
 569 #endif
 570
 571   /* We don't check for (*str != '\0') here because we want to parse
 572      any trailing fake arguments in the syntax string.  */
 573   syn = CGEN_SYNTAX_STRING (syntax);
 574
 575   /* Mnemonics come first for now, ensure valid string.  */
 576   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 577     abort ();
 578
 579   ++syn;
 580
 581   while (* syn != 0)
 582     {
 583       /* Non operand chars must match exactly.  */
 584       if (CGEN_SYNTAX_CHAR_P (* syn))
 585         {
 586           /* FIXME: While we allow for non-GAS callers above, we assume the
 587              first char after the mnemonic part is a space.  */
 588           /* FIXME: We also take inappropriate advantage of the fact that
 589              GAS's input scrubber will remove extraneous blanks.  */
 590           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 591             {
 592 #ifdef CGEN_MNEMONIC_OPERANDS
 593               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 594                 past_opcode_p = 1;
 595 #endif
 596               ++ syn;
 597               ++ str;
 598             }
 599           else if (*str)
 600             {
 601               /* Syntax char didn't match.  Can't be this insn.  */
 602               static char msg [80];
 603
 604               /* xgettext:c-format */
 605               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 606                        CGEN_SYNTAX_CHAR(*syn), *str);
 607               return msg;
 608             }
 609           else
 610             {
 611               /* Ran out of input.  */
 612               static char msg [80];
 613
 614               /* xgettext:c-format */
 615               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 616                        CGEN_SYNTAX_CHAR(*syn));
 617               return msg;
 618             }
 619           continue;
 620         }
 621
 622       /* We have an operand of some sort.  */
 623       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 624                                           &str, fields);
 625       if (errmsg)
 626         return errmsg;
 627
 628       /* Done with this operand, continue with next one.  */
 629       ++ syn;
 630     }
 631
 632   /* If we're at the end of the syntax string, we're done.  */
 633   if (* syn == 0)
 634     {
 635       /* FIXME: For the moment we assume a valid `str' can only contain
 636          blanks now.  IE: We needn't try again with a longer version of
 637          the insn and it is assumed that longer versions of insns appear
 638          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 639       while (ISSPACE (* str))
 640         ++ str;
 641
 642       if (* str != '\0')
 643         return _("junk at end of line"); /* FIXME: would like to include `str' */
 644
 645       return NULL;
 646     }
 647
 648   /* We couldn't parse it.  */
 649   return _("unrecognized instruction");
 650 }
 651 \f
 652 /* Main entry point.
 653    This routine is called for each instruction to be assembled.
 654    STR points to the insn to be assembled.
 655    We assume all necessary tables have been initialized.
 656    The assembled instruction, less any fixups, is stored in BUF.
 657    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 658    still needs to be converted to target byte order, otherwise BUF is an array
 659    of bytes in target byte order.
 660    The result is a pointer to the insn's entry in the opcode table,
 661    or NULL if an error occured (an error message will have already been
 662    printed).
 663
 664    Note that when processing (non-alias) macro-insns,
 665    this function recurses.
 666
 667    ??? It's possible to make this cpu-independent.
 668    One would have to deal with a few minor things.
 669    At this point in time doing so would be more of a curiosity than useful
 670    [for example this file isn't _that_ big], but keeping the possibility in
 671    mind helps keep the design clean.  */
 672
 673 const CGEN_INSN *
 674 xc16x_cgen_assemble_insn (CGEN_CPU_DESC cd,
 675                            const char *str,
 676                            CGEN_FIELDS *fields,
 677                            CGEN_INSN_BYTES_PTR buf,
 678                            char **errmsg)
 679 {
 680   const char *start;
 681   CGEN_INSN_LIST *ilist;
 682   const char *parse_errmsg = NULL;
 683   const char *insert_errmsg = NULL;
 684   int recognized_mnemonic = 0;
 685
 686   /* Skip leading white space.  */
 687   while (ISSPACE (* str))
 688     ++ str;
 689
 690   /* The instructions are stored in hashed lists.
 691      Get the first in the list.  */
 692   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 693
 694   /* Keep looking until we find a match.  */
 695   start = str;
 696   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 697     {
 698       const CGEN_INSN *insn = ilist->insn;
 699       recognized_mnemonic = 1;
 700
 701 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 702       /* Not usually needed as unsupported opcodes
 703          shouldn't be in the hash lists.  */
 704       /* Is this insn supported by the selected cpu?  */
 705       if (! xc16x_cgen_insn_supported (cd, insn))
 706         continue;
 707 #endif
 708       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 709          chosen immediately.  Instead, it is used during assembler/linker
 710          relaxation if possible.  */
 711       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 712         continue;
 713
 714       str = start;
 715
 716       /* Skip this insn if str doesn't look right lexically.  */
 717       if (CGEN_INSN_RX (insn) != NULL &&
 718           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 719         continue;
 720
 721       /* Allow parse/insert handlers to obtain length of insn.  */
 722       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 723
 724       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 725       if (parse_errmsg != NULL)
 726         continue;
 727
 728       /* ??? 0 is passed for `pc'.  */
 729       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 730                                                  (bfd_vma) 0);
 731       if (insert_errmsg != NULL)
 732         continue;
 733
 734       /* It is up to the caller to actually output the insn and any
 735          queued relocs.  */
 736       return insn;
 737     }
 738
 739   {
 740     static char errbuf[150];
 741 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 742     const char *tmp_errmsg;
 743
 744     /* If requesting verbose error messages, use insert_errmsg.
 745        Failing that, use parse_errmsg.  */
 746     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 747                   parse_errmsg ? parse_errmsg :
 748                   recognized_mnemonic ?
 749                   _("unrecognized form of instruction") :
 750                   _("unrecognized instruction"));
 751
 752     if (strlen (start) > 50)
 753       /* xgettext:c-format */
 754       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 755     else
 756       /* xgettext:c-format */
 757       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 758 #else
 759     if (strlen (start) > 50)
 760       /* xgettext:c-format */
 761       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 762     else
 763       /* xgettext:c-format */
 764       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 765 #endif
 766
 767     *errmsg = errbuf;
 768     return NULL;
 769   }
 770 }