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, 2007, 2008
   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 "xc16x-desc.h"
  36 #include "xc16x-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 /* Handle '#' prefixes (i.e. skip over them).  */
  54
  55 static const char *
  56 parse_hash (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  57             const char **strp,
  58             int opindex ATTRIBUTE_UNUSED,
  59             long *valuep ATTRIBUTE_UNUSED)
  60 {
  61   if (**strp == '#')
  62     {
  63       ++*strp;
  64       return NULL;
  65     }
  66   return _("Missing '#' prefix");
  67 }
  68
  69 /* Handle '.' prefixes (i.e. skip over them).  */
  70
  71 static const char *
  72 parse_dot (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  73            const char **strp,
  74            int opindex ATTRIBUTE_UNUSED,
  75            long *valuep ATTRIBUTE_UNUSED)
  76 {
  77   if (**strp == '.')
  78     {
  79       ++*strp;
  80       return NULL;
  81     }
  82   return _("Missing '.' prefix");
  83 }
  84
  85 /* Handle 'pof:' prefixes (i.e. skip over them).  */
  86
  87 static const char *
  88 parse_pof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
  89            const char **strp,
  90            int opindex ATTRIBUTE_UNUSED,
  91            long *valuep ATTRIBUTE_UNUSED)
  92 {
  93   if (strncasecmp (*strp, "pof:", 4) == 0)
  94     {
  95       *strp += 4;
  96       return NULL;
  97     }
  98   return _("Missing 'pof:' prefix");
  99 }
 100
 101 /* Handle 'pag:' prefixes (i.e. skip over them).  */
 102
 103 static const char *
 104 parse_pag (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 105            const char **strp,
 106            int opindex ATTRIBUTE_UNUSED,
 107            long *valuep ATTRIBUTE_UNUSED)
 108 {
 109   if (strncasecmp (*strp, "pag:", 4) == 0)
 110     {
 111       *strp += 4;
 112       return NULL;
 113     }
 114   return _("Missing 'pag:' prefix");
 115 }
 116
 117 /* Handle 'sof' prefixes (i.e. skip over them).  */
 118
 119 static const char *
 120 parse_sof (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 121            const char **strp,
 122            int opindex ATTRIBUTE_UNUSED,
 123            long *valuep ATTRIBUTE_UNUSED)
 124 {
 125   if (strncasecmp (*strp, "sof:", 4) == 0)
 126     {
 127       *strp += 4;
 128       return NULL;
 129     }
 130   return _("Missing 'sof:' prefix");
 131 }
 132
 133 /* Handle 'seg' prefixes (i.e. skip over them).  */
 134
 135 static const char *
 136 parse_seg (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 137            const char **strp,
 138            int opindex ATTRIBUTE_UNUSED,
 139            long *valuep ATTRIBUTE_UNUSED)
 140 {
 141   if (strncasecmp (*strp, "seg:", 4) == 0)
 142     {
 143       *strp += 4;
 144       return NULL;
 145     }
 146   return _("Missing 'seg:' prefix");
 147 }
 148 /* -- */
 149
 150 const char * xc16x_cgen_parse_operand
 151   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 152
 153 /* Main entry point for operand parsing.
 154
 155    This function is basically just a big switch statement.  Earlier versions
 156    used tables to look up the function to use, but
 157    - if the table contains both assembler and disassembler functions then
 158      the disassembler contains much of the assembler and vice-versa,
 159    - there's a lot of inlining possibilities as things grow,
 160    - using a switch statement avoids the function call overhead.
 161
 162    This function could be moved into `parse_insn_normal', but keeping it
 163    separate makes clear the interface between `parse_insn_normal' and each of
 164    the handlers.  */
 165
 166 const char *
 167 xc16x_cgen_parse_operand (CGEN_CPU_DESC cd,
 168                            int opindex,
 169                            const char ** strp,
 170                            CGEN_FIELDS * fields)
 171 {
 172   const char * errmsg = NULL;
 173   /* Used by scalar operands that still need to be parsed.  */
 174   long junk ATTRIBUTE_UNUSED;
 175
 176   switch (opindex)
 177     {
 178     case XC16X_OPERAND_REGNAM :
 179       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_psw_names, & fields->f_reg8);
 180       break;
 181     case XC16X_OPERAND_BIT01 :
 182       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT01, (unsigned long *) (& fields->f_op_1bit));
 183       break;
 184     case XC16X_OPERAND_BIT1 :
 185       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT1, (unsigned long *) (& fields->f_op_bit1));
 186       break;
 187     case XC16X_OPERAND_BIT2 :
 188       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT2, (unsigned long *) (& fields->f_op_bit2));
 189       break;
 190     case XC16X_OPERAND_BIT4 :
 191       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT4, (unsigned long *) (& fields->f_op_bit4));
 192       break;
 193     case XC16X_OPERAND_BIT8 :
 194       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BIT8, (unsigned long *) (& fields->f_op_bit8));
 195       break;
 196     case XC16X_OPERAND_BITONE :
 197       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_BITONE, (unsigned long *) (& fields->f_op_onebit));
 198       break;
 199     case XC16X_OPERAND_CADDR :
 200       {
 201         bfd_vma value = 0;
 202         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_CADDR, 0, NULL,  & value);
 203         fields->f_offset16 = value;
 204       }
 205       break;
 206     case XC16X_OPERAND_COND :
 207       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_condcode);
 208       break;
 209     case XC16X_OPERAND_DATA8 :
 210       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATA8, (unsigned long *) (& fields->f_data8));
 211       break;
 212     case XC16X_OPERAND_DATAHI8 :
 213       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_DATAHI8, (unsigned long *) (& fields->f_datahi8));
 214       break;
 215     case XC16X_OPERAND_DOT :
 216       errmsg = parse_dot (cd, strp, XC16X_OPERAND_DOT, (long *) (& junk));
 217       break;
 218     case XC16X_OPERAND_DR :
 219       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
 220       break;
 221     case XC16X_OPERAND_DRB :
 222       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r1);
 223       break;
 224     case XC16X_OPERAND_DRI :
 225       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r4);
 226       break;
 227     case XC16X_OPERAND_EXTCOND :
 228       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_extconditioncode_names, & fields->f_extccode);
 229       break;
 230     case XC16X_OPERAND_GENREG :
 231       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regb8);
 232       break;
 233     case XC16X_OPERAND_HASH :
 234       errmsg = parse_hash (cd, strp, XC16X_OPERAND_HASH, (long *) (& junk));
 235       break;
 236     case XC16X_OPERAND_ICOND :
 237       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_conditioncode_names, & fields->f_icondcode);
 238       break;
 239     case XC16X_OPERAND_LBIT2 :
 240       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT2, (unsigned long *) (& fields->f_op_lbit2));
 241       break;
 242     case XC16X_OPERAND_LBIT4 :
 243       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_LBIT4, (unsigned long *) (& fields->f_op_lbit4));
 244       break;
 245     case XC16X_OPERAND_MASK8 :
 246       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASK8, (unsigned long *) (& fields->f_mask8));
 247       break;
 248     case XC16X_OPERAND_MASKLO8 :
 249       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_MASKLO8, (unsigned long *) (& fields->f_datahi8));
 250       break;
 251     case XC16X_OPERAND_MEMGR8 :
 252       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_memgr8_names, & fields->f_memgr8);
 253       break;
 254     case XC16X_OPERAND_MEMORY :
 255       {
 256         bfd_vma value = 0;
 257         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_MEMORY, 0, NULL,  & value);
 258         fields->f_memory = value;
 259       }
 260       break;
 261     case XC16X_OPERAND_PAG :
 262       errmsg = parse_pag (cd, strp, XC16X_OPERAND_PAG, (long *) (& junk));
 263       break;
 264     case XC16X_OPERAND_PAGENUM :
 265       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_PAGENUM, (unsigned long *) (& fields->f_pagenum));
 266       break;
 267     case XC16X_OPERAND_POF :
 268       errmsg = parse_pof (cd, strp, XC16X_OPERAND_POF, (long *) (& junk));
 269       break;
 270     case XC16X_OPERAND_QBIT :
 271       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QBIT, (unsigned long *) (& fields->f_qbit));
 272       break;
 273     case XC16X_OPERAND_QHIBIT :
 274       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QHIBIT, (unsigned long *) (& fields->f_qhibit));
 275       break;
 276     case XC16X_OPERAND_QLOBIT :
 277       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_QLOBIT, (unsigned long *) (& fields->f_qlobit));
 278       break;
 279     case XC16X_OPERAND_REG8 :
 280       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reg8);
 281       break;
 282     case XC16X_OPERAND_REGB8 :
 283       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb8_names, & fields->f_regb8);
 284       break;
 285     case XC16X_OPERAND_REGBMEM8 :
 286       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regbmem8_names, & fields->f_regmem8);
 287       break;
 288     case XC16X_OPERAND_REGHI8 :
 289       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_reghi8);
 290       break;
 291     case XC16X_OPERAND_REGMEM8 :
 292       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regmem8_names, & fields->f_regmem8);
 293       break;
 294     case XC16X_OPERAND_REGOFF8 :
 295       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_r8_names, & fields->f_regoff8);
 296       break;
 297     case XC16X_OPERAND_REL :
 298       errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_REL, (long *) (& fields->f_rel8));
 299       break;
 300     case XC16X_OPERAND_RELHI :
 301       errmsg = cgen_parse_signed_integer (cd, strp, XC16X_OPERAND_RELHI, (long *) (& fields->f_relhi8));
 302       break;
 303     case XC16X_OPERAND_SEG :
 304       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEG, (unsigned long *) (& fields->f_seg8));
 305       break;
 306     case XC16X_OPERAND_SEGHI8 :
 307       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_SEGHI8, (unsigned long *) (& fields->f_segnum8));
 308       break;
 309     case XC16X_OPERAND_SEGM :
 310       errmsg = parse_seg (cd, strp, XC16X_OPERAND_SEGM, (long *) (& junk));
 311       break;
 312     case XC16X_OPERAND_SOF :
 313       errmsg = parse_sof (cd, strp, XC16X_OPERAND_SOF, (long *) (& junk));
 314       break;
 315     case XC16X_OPERAND_SR :
 316       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
 317       break;
 318     case XC16X_OPERAND_SR2 :
 319       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r0);
 320       break;
 321     case XC16X_OPERAND_SRB :
 322       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_grb_names, & fields->f_r2);
 323       break;
 324     case XC16X_OPERAND_SRC1 :
 325       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r1);
 326       break;
 327     case XC16X_OPERAND_SRC2 :
 328       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_gr_names, & fields->f_r2);
 329       break;
 330     case XC16X_OPERAND_SRDIV :
 331       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_regdiv8_names, & fields->f_reg8);
 332       break;
 333     case XC16X_OPERAND_U4 :
 334       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name, & fields->f_uimm4);
 335       break;
 336     case XC16X_OPERAND_UIMM16 :
 337       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM16, (unsigned long *) (& fields->f_uimm16));
 338       break;
 339     case XC16X_OPERAND_UIMM2 :
 340       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_ext_names, & fields->f_uimm2);
 341       break;
 342     case XC16X_OPERAND_UIMM3 :
 343       errmsg = cgen_parse_keyword (cd, strp, & xc16x_cgen_opval_reg0_name1, & fields->f_uimm3);
 344       break;
 345     case XC16X_OPERAND_UIMM4 :
 346       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM4, (unsigned long *) (& fields->f_uimm4));
 347       break;
 348     case XC16X_OPERAND_UIMM7 :
 349       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM7, (unsigned long *) (& fields->f_uimm7));
 350       break;
 351     case XC16X_OPERAND_UIMM8 :
 352       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UIMM8, (unsigned long *) (& fields->f_uimm8));
 353       break;
 354     case XC16X_OPERAND_UPAG16 :
 355       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_UPAG16, (unsigned long *) (& fields->f_uimm16));
 356       break;
 357     case XC16X_OPERAND_UPOF16 :
 358       {
 359         bfd_vma value = 0;
 360         errmsg = cgen_parse_address (cd, strp, XC16X_OPERAND_UPOF16, 0, NULL,  & value);
 361         fields->f_memory = value;
 362       }
 363       break;
 364     case XC16X_OPERAND_USEG16 :
 365       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG16, (unsigned long *) (& fields->f_offset16));
 366       break;
 367     case XC16X_OPERAND_USEG8 :
 368       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USEG8, (unsigned long *) (& fields->f_seg8));
 369       break;
 370     case XC16X_OPERAND_USOF16 :
 371       errmsg = cgen_parse_unsigned_integer (cd, strp, XC16X_OPERAND_USOF16, (unsigned long *) (& fields->f_offset16));
 372       break;
 373
 374     default :
 375       /* xgettext:c-format */
 376       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 377       abort ();
 378   }
 379
 380   return errmsg;
 381 }
 382
 383 cgen_parse_fn * const xc16x_cgen_parse_handlers[] =
 384 {
 385   parse_insn_normal,
 386 };
 387
 388 void
 389 xc16x_cgen_init_asm (CGEN_CPU_DESC cd)
 390 {
 391   xc16x_cgen_init_opcode_table (cd);
 392   xc16x_cgen_init_ibld_table (cd);
 393   cd->parse_handlers = & xc16x_cgen_parse_handlers[0];
 394   cd->parse_operand = xc16x_cgen_parse_operand;
 395 #ifdef CGEN_ASM_INIT_HOOK
 396 CGEN_ASM_INIT_HOOK
 397 #endif
 398 }
 399
 400 \f
 401
 402 /* Regex construction routine.
 403
 404    This translates an opcode syntax string into a regex string,
 405    by replacing any non-character syntax element (such as an
 406    opcode) with the pattern '.*'
 407
 408    It then compiles the regex and stores it in the opcode, for
 409    later use by xc16x_cgen_assemble_insn
 410
 411    Returns NULL for success, an error message for failure.  */
 412
 413 char *
 414 xc16x_cgen_build_insn_regex (CGEN_INSN *insn)
 415 {
 416   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 417   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 418   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 419   char *rx = rxbuf;
 420   const CGEN_SYNTAX_CHAR_TYPE *syn;
 421   int reg_err;
 422
 423   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 424
 425   /* Mnemonics come first in the syntax string.  */
 426   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 427     return _("missing mnemonic in syntax string");
 428   ++syn;
 429
 430   /* Generate a case sensitive regular expression that emulates case
 431      insensitive matching in the "C" locale.  We cannot generate a case
 432      insensitive regular expression because in Turkish locales, 'i' and 'I'
 433      are not equal modulo case conversion.  */
 434
 435   /* Copy the literal mnemonic out of the insn.  */
 436   for (; *mnem; mnem++)
 437     {
 438       char c = *mnem;
 439
 440       if (ISALPHA (c))
 441         {
 442           *rx++ = '[';
 443           *rx++ = TOLOWER (c);
 444           *rx++ = TOUPPER (c);
 445           *rx++ = ']';
 446         }
 447       else
 448         *rx++ = c;
 449     }
 450
 451   /* Copy any remaining literals from the syntax string into the rx.  */
 452   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 453     {
 454       if (CGEN_SYNTAX_CHAR_P (* syn))
 455         {
 456           char c = CGEN_SYNTAX_CHAR (* syn);
 457
 458           switch (c)
 459             {
 460               /* Escape any regex metacharacters in the syntax.  */
 461             case '.': case '[': case '\\':
 462             case '*': case '^': case '$':
 463
 464 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 465             case '?': case '{': case '}':
 466             case '(': case ')': case '*':
 467             case '|': case '+': case ']':
 468 #endif
 469               *rx++ = '\\';
 470               *rx++ = c;
 471               break;
 472
 473             default:
 474               if (ISALPHA (c))
 475                 {
 476                   *rx++ = '[';
 477                   *rx++ = TOLOWER (c);
 478                   *rx++ = TOUPPER (c);
 479                   *rx++ = ']';
 480                 }
 481               else
 482                 *rx++ = c;
 483               break;
 484             }
 485         }
 486       else
 487         {
 488           /* Replace non-syntax fields with globs.  */
 489           *rx++ = '.';
 490           *rx++ = '*';
 491         }
 492     }
 493
 494   /* Trailing whitespace ok.  */
 495   * rx++ = '[';
 496   * rx++ = ' ';
 497   * rx++ = '\t';
 498   * rx++ = ']';
 499   * rx++ = '*';
 500
 501   /* But anchor it after that.  */
 502   * rx++ = '$';
 503   * rx = '\0';
 504
 505   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 506   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 507
 508   if (reg_err == 0)
 509     return NULL;
 510   else
 511     {
 512       static char msg[80];
 513
 514       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 515       regfree ((regex_t *) CGEN_INSN_RX (insn));
 516       free (CGEN_INSN_RX (insn));
 517       (CGEN_INSN_RX (insn)) = NULL;
 518       return msg;
 519     }
 520 }
 521
 522 \f
 523 /* Default insn parser.
 524
 525    The syntax string is scanned and operands are parsed and stored in FIELDS.
 526    Relocs are queued as we go via other callbacks.
 527
 528    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 529    parse the instruction, we return 0 and the caller will start over from
 530    the beginning.  Backtracking will be necessary in parsing subexpressions,
 531    but that can be handled there.  Not handling backtracking here may get
 532    expensive in the case of the m68k.  Deal with later.
 533
 534    Returns NULL for success, an error message for failure.  */
 535
 536 static const char *
 537 parse_insn_normal (CGEN_CPU_DESC cd,
 538                    const CGEN_INSN *insn,
 539                    const char **strp,
 540                    CGEN_FIELDS *fields)
 541 {
 542   /* ??? Runtime added insns not handled yet.  */
 543   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 544   const char *str = *strp;
 545   const char *errmsg;
 546   const char *p;
 547   const CGEN_SYNTAX_CHAR_TYPE * syn;
 548 #ifdef CGEN_MNEMONIC_OPERANDS
 549   /* FIXME: wip */
 550   int past_opcode_p;
 551 #endif
 552
 553   /* For now we assume the mnemonic is first (there are no leading operands).
 554      We can parse it without needing to set up operand parsing.
 555      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 556      not be called from GAS.  */
 557   p = CGEN_INSN_MNEMONIC (insn);
 558   while (*p && TOLOWER (*p) == TOLOWER (*str))
 559     ++p, ++str;
 560
 561   if (* p)
 562     return _("unrecognized instruction");
 563
 564 #ifndef CGEN_MNEMONIC_OPERANDS
 565   if (* str && ! ISSPACE (* str))
 566     return _("unrecognized instruction");
 567 #endif
 568
 569   CGEN_INIT_PARSE (cd);
 570   cgen_init_parse_operand (cd);
 571 #ifdef CGEN_MNEMONIC_OPERANDS
 572   past_opcode_p = 0;
 573 #endif
 574
 575   /* We don't check for (*str != '\0') here because we want to parse
 576      any trailing fake arguments in the syntax string.  */
 577   syn = CGEN_SYNTAX_STRING (syntax);
 578
 579   /* Mnemonics come first for now, ensure valid string.  */
 580   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 581     abort ();
 582
 583   ++syn;
 584
 585   while (* syn != 0)
 586     {
 587       /* Non operand chars must match exactly.  */
 588       if (CGEN_SYNTAX_CHAR_P (* syn))
 589         {
 590           /* FIXME: While we allow for non-GAS callers above, we assume the
 591              first char after the mnemonic part is a space.  */
 592           /* FIXME: We also take inappropriate advantage of the fact that
 593              GAS's input scrubber will remove extraneous blanks.  */
 594           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 595             {
 596 #ifdef CGEN_MNEMONIC_OPERANDS
 597               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 598                 past_opcode_p = 1;
 599 #endif
 600               ++ syn;
 601               ++ str;
 602             }
 603           else if (*str)
 604             {
 605               /* Syntax char didn't match.  Can't be this insn.  */
 606               static char msg [80];
 607
 608               /* xgettext:c-format */
 609               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 610                        CGEN_SYNTAX_CHAR(*syn), *str);
 611               return msg;
 612             }
 613           else
 614             {
 615               /* Ran out of input.  */
 616               static char msg [80];
 617
 618               /* xgettext:c-format */
 619               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 620                        CGEN_SYNTAX_CHAR(*syn));
 621               return msg;
 622             }
 623           continue;
 624         }
 625
 626       /* We have an operand of some sort.  */
 627       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 628                                           &str, fields);
 629       if (errmsg)
 630         return errmsg;
 631
 632       /* Done with this operand, continue with next one.  */
 633       ++ syn;
 634     }
 635
 636   /* If we're at the end of the syntax string, we're done.  */
 637   if (* syn == 0)
 638     {
 639       /* FIXME: For the moment we assume a valid `str' can only contain
 640          blanks now.  IE: We needn't try again with a longer version of
 641          the insn and it is assumed that longer versions of insns appear
 642          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 643       while (ISSPACE (* str))
 644         ++ str;
 645
 646       if (* str != '\0')
 647         return _("junk at end of line"); /* FIXME: would like to include `str' */
 648
 649       return NULL;
 650     }
 651
 652   /* We couldn't parse it.  */
 653   return _("unrecognized instruction");
 654 }
 655 \f
 656 /* Main entry point.
 657    This routine is called for each instruction to be assembled.
 658    STR points to the insn to be assembled.
 659    We assume all necessary tables have been initialized.
 660    The assembled instruction, less any fixups, is stored in BUF.
 661    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 662    still needs to be converted to target byte order, otherwise BUF is an array
 663    of bytes in target byte order.
 664    The result is a pointer to the insn's entry in the opcode table,
 665    or NULL if an error occured (an error message will have already been
 666    printed).
 667
 668    Note that when processing (non-alias) macro-insns,
 669    this function recurses.
 670
 671    ??? It's possible to make this cpu-independent.
 672    One would have to deal with a few minor things.
 673    At this point in time doing so would be more of a curiosity than useful
 674    [for example this file isn't _that_ big], but keeping the possibility in
 675    mind helps keep the design clean.  */
 676
 677 const CGEN_INSN *
 678 xc16x_cgen_assemble_insn (CGEN_CPU_DESC cd,
 679                            const char *str,
 680                            CGEN_FIELDS *fields,
 681                            CGEN_INSN_BYTES_PTR buf,
 682                            char **errmsg)
 683 {
 684   const char *start;
 685   CGEN_INSN_LIST *ilist;
 686   const char *parse_errmsg = NULL;
 687   const char *insert_errmsg = NULL;
 688   int recognized_mnemonic = 0;
 689
 690   /* Skip leading white space.  */
 691   while (ISSPACE (* str))
 692     ++ str;
 693
 694   /* The instructions are stored in hashed lists.
 695      Get the first in the list.  */
 696   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 697
 698   /* Keep looking until we find a match.  */
 699   start = str;
 700   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 701     {
 702       const CGEN_INSN *insn = ilist->insn;
 703       recognized_mnemonic = 1;
 704
 705 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 706       /* Not usually needed as unsupported opcodes
 707          shouldn't be in the hash lists.  */
 708       /* Is this insn supported by the selected cpu?  */
 709       if (! xc16x_cgen_insn_supported (cd, insn))
 710         continue;
 711 #endif
 712       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 713          chosen immediately.  Instead, it is used during assembler/linker
 714          relaxation if possible.  */
 715       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 716         continue;
 717
 718       str = start;
 719
 720       /* Skip this insn if str doesn't look right lexically.  */
 721       if (CGEN_INSN_RX (insn) != NULL &&
 722           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 723         continue;
 724
 725       /* Allow parse/insert handlers to obtain length of insn.  */
 726       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 727
 728       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 729       if (parse_errmsg != NULL)
 730         continue;
 731
 732       /* ??? 0 is passed for `pc'.  */
 733       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 734                                                  (bfd_vma) 0);
 735       if (insert_errmsg != NULL)
 736         continue;
 737
 738       /* It is up to the caller to actually output the insn and any
 739          queued relocs.  */
 740       return insn;
 741     }
 742
 743   {
 744     static char errbuf[150];
 745 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 746     const char *tmp_errmsg;
 747
 748     /* If requesting verbose error messages, use insert_errmsg.
 749        Failing that, use parse_errmsg.  */
 750     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 751                   parse_errmsg ? parse_errmsg :
 752                   recognized_mnemonic ?
 753                   _("unrecognized form of instruction") :
 754                   _("unrecognized instruction"));
 755
 756     if (strlen (start) > 50)
 757       /* xgettext:c-format */
 758       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 759     else
 760       /* xgettext:c-format */
 761       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 762 #else
 763     if (strlen (start) > 50)
 764       /* xgettext:c-format */
 765       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 766     else
 767       /* xgettext:c-format */
 768       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 769 #endif
 770
 771     *errmsg = errbuf;
 772     return NULL;
 773   }
 774 }