opcodes/cgen-asm.in

   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 "@prefix@-desc.h"
  35 #include "@prefix@-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 \f
  51
  52 /* Regex construction routine.
  53
  54    This translates an opcode syntax string into a regex string,
  55    by replacing any non-character syntax element (such as an
  56    opcode) with the pattern '.*'
  57
  58    It then compiles the regex and stores it in the opcode, for
  59    later use by @arch@_cgen_assemble_insn
  60
  61    Returns NULL for success, an error message for failure.  */
  62
  63 char *
  64 @arch@_cgen_build_insn_regex (CGEN_INSN *insn)
  65 {
  66   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
  67   const char *mnem = CGEN_INSN_MNEMONIC (insn);
  68   char rxbuf[CGEN_MAX_RX_ELEMENTS];
  69   char *rx = rxbuf;
  70   const CGEN_SYNTAX_CHAR_TYPE *syn;
  71   int reg_err;
  72
  73   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
  74
  75   /* Mnemonics come first in the syntax string.  */
  76   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
  77     return _("missing mnemonic in syntax string");
  78   ++syn;
  79
  80   /* Generate a case sensitive regular expression that emulates case
  81      insensitive matching in the "C" locale.  We cannot generate a case
  82      insensitive regular expression because in Turkish locales, 'i' and 'I'
  83      are not equal modulo case conversion.  */
  84
  85   /* Copy the literal mnemonic out of the insn.  */
  86   for (; *mnem; mnem++)
  87     {
  88       char c = *mnem;
  89
  90       if (ISALPHA (c))
  91         {
  92           *rx++ = '[';
  93           *rx++ = TOLOWER (c);
  94           *rx++ = TOUPPER (c);
  95           *rx++ = ']';
  96         }
  97       else
  98         *rx++ = c;
  99     }
 100
 101   /* Copy any remaining literals from the syntax string into the rx.  */
 102   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 103     {
 104       if (CGEN_SYNTAX_CHAR_P (* syn))
 105         {
 106           char c = CGEN_SYNTAX_CHAR (* syn);
 107
 108           switch (c)
 109             {
 110               /* Escape any regex metacharacters in the syntax.  */
 111             case '.': case '[': case '\\':
 112             case '*': case '^': case '$':
 113
 114 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 115             case '?': case '{': case '}':
 116             case '(': case ')': case '*':
 117             case '|': case '+': case ']':
 118 #endif
 119               *rx++ = '\\';
 120               *rx++ = c;
 121               break;
 122
 123             default:
 124               if (ISALPHA (c))
 125                 {
 126                   *rx++ = '[';
 127                   *rx++ = TOLOWER (c);
 128                   *rx++ = TOUPPER (c);
 129                   *rx++ = ']';
 130                 }
 131               else
 132                 *rx++ = c;
 133               break;
 134             }
 135         }
 136       else
 137         {
 138           /* Replace non-syntax fields with globs.  */
 139           *rx++ = '.';
 140           *rx++ = '*';
 141         }
 142     }
 143
 144   /* Trailing whitespace ok.  */
 145   * rx++ = '[';
 146   * rx++ = ' ';
 147   * rx++ = '\t';
 148   * rx++ = ']';
 149   * rx++ = '*';
 150
 151   /* But anchor it after that.  */
 152   * rx++ = '$';
 153   * rx = '\0';
 154
 155   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 156   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 157
 158   if (reg_err == 0)
 159     return NULL;
 160   else
 161     {
 162       static char msg[80];
 163
 164       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 165       regfree ((regex_t *) CGEN_INSN_RX (insn));
 166       free (CGEN_INSN_RX (insn));
 167       (CGEN_INSN_RX (insn)) = NULL;
 168       return msg;
 169     }
 170 }
 171
 172 \f
 173 /* Default insn parser.
 174
 175    The syntax string is scanned and operands are parsed and stored in FIELDS.
 176    Relocs are queued as we go via other callbacks.
 177
 178    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 179    parse the instruction, we return 0 and the caller will start over from
 180    the beginning.  Backtracking will be necessary in parsing subexpressions,
 181    but that can be handled there.  Not handling backtracking here may get
 182    expensive in the case of the m68k.  Deal with later.
 183
 184    Returns NULL for success, an error message for failure.  */
 185
 186 static const char *
 187 parse_insn_normal (CGEN_CPU_DESC cd,
 188                    const CGEN_INSN *insn,
 189                    const char **strp,
 190                    CGEN_FIELDS *fields)
 191 {
 192   /* ??? Runtime added insns not handled yet.  */
 193   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 194   const char *str = *strp;
 195   const char *errmsg;
 196   const char *p;
 197   const CGEN_SYNTAX_CHAR_TYPE * syn;
 198 #ifdef CGEN_MNEMONIC_OPERANDS
 199   /* FIXME: wip */
 200   int past_opcode_p;
 201 #endif
 202
 203   /* For now we assume the mnemonic is first (there are no leading operands).
 204      We can parse it without needing to set up operand parsing.
 205      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 206      not be called from GAS.  */
 207   p = CGEN_INSN_MNEMONIC (insn);
 208   while (*p && TOLOWER (*p) == TOLOWER (*str))
 209     ++p, ++str;
 210
 211   if (* p)
 212     return _("unrecognized instruction");
 213
 214 #ifndef CGEN_MNEMONIC_OPERANDS
 215   if (* str && ! ISSPACE (* str))
 216     return _("unrecognized instruction");
 217 #endif
 218
 219   CGEN_INIT_PARSE (cd);
 220   cgen_init_parse_operand (cd);
 221 #ifdef CGEN_MNEMONIC_OPERANDS
 222   past_opcode_p = 0;
 223 #endif
 224
 225   /* We don't check for (*str != '\0') here because we want to parse
 226      any trailing fake arguments in the syntax string.  */
 227   syn = CGEN_SYNTAX_STRING (syntax);
 228
 229   /* Mnemonics come first for now, ensure valid string.  */
 230   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 231     abort ();
 232
 233   ++syn;
 234
 235   while (* syn != 0)
 236     {
 237       /* Non operand chars must match exactly.  */
 238       if (CGEN_SYNTAX_CHAR_P (* syn))
 239         {
 240           /* FIXME: While we allow for non-GAS callers above, we assume the
 241              first char after the mnemonic part is a space.  */
 242           /* FIXME: We also take inappropriate advantage of the fact that
 243              GAS's input scrubber will remove extraneous blanks.  */
 244           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 245             {
 246 #ifdef CGEN_MNEMONIC_OPERANDS
 247               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 248                 past_opcode_p = 1;
 249 #endif
 250               ++ syn;
 251               ++ str;
 252             }
 253           else if (*str)
 254             {
 255               /* Syntax char didn't match.  Can't be this insn.  */
 256               static char msg [80];
 257
 258               /* xgettext:c-format */
 259               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 260                        CGEN_SYNTAX_CHAR(*syn), *str);
 261               return msg;
 262             }
 263           else
 264             {
 265               /* Ran out of input.  */
 266               static char msg [80];
 267
 268               /* xgettext:c-format */
 269               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 270                        CGEN_SYNTAX_CHAR(*syn));
 271               return msg;
 272             }
 273           continue;
 274         }
 275
 276       /* We have an operand of some sort.  */
 277       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 278                                           &str, fields);
 279       if (errmsg)
 280         return errmsg;
 281
 282       /* Done with this operand, continue with next one.  */
 283       ++ syn;
 284     }
 285
 286   /* If we're at the end of the syntax string, we're done.  */
 287   if (* syn == 0)
 288     {
 289       /* FIXME: For the moment we assume a valid `str' can only contain
 290          blanks now.  IE: We needn't try again with a longer version of
 291          the insn and it is assumed that longer versions of insns appear
 292          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 293       while (ISSPACE (* str))
 294         ++ str;
 295
 296       if (* str != '\0')
 297         return _("junk at end of line"); /* FIXME: would like to include `str' */
 298
 299       return NULL;
 300     }
 301
 302   /* We couldn't parse it.  */
 303   return _("unrecognized instruction");
 304 }
 305 \f
 306 /* Main entry point.
 307    This routine is called for each instruction to be assembled.
 308    STR points to the insn to be assembled.
 309    We assume all necessary tables have been initialized.
 310    The assembled instruction, less any fixups, is stored in BUF.
 311    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 312    still needs to be converted to target byte order, otherwise BUF is an array
 313    of bytes in target byte order.
 314    The result is a pointer to the insn's entry in the opcode table,
 315    or NULL if an error occured (an error message will have already been
 316    printed).
 317
 318    Note that when processing (non-alias) macro-insns,
 319    this function recurses.
 320
 321    ??? It's possible to make this cpu-independent.
 322    One would have to deal with a few minor things.
 323    At this point in time doing so would be more of a curiosity than useful
 324    [for example this file isn't _that_ big], but keeping the possibility in
 325    mind helps keep the design clean.  */
 326
 327 const CGEN_INSN *
 328 @arch@_cgen_assemble_insn (CGEN_CPU_DESC cd,
 329                            const char *str,
 330                            CGEN_FIELDS *fields,
 331                            CGEN_INSN_BYTES_PTR buf,
 332                            char **errmsg)
 333 {
 334   const char *start;
 335   CGEN_INSN_LIST *ilist;
 336   const char *parse_errmsg = NULL;
 337   const char *insert_errmsg = NULL;
 338   int recognized_mnemonic = 0;
 339
 340   /* Skip leading white space.  */
 341   while (ISSPACE (* str))
 342     ++ str;
 343
 344   /* The instructions are stored in hashed lists.
 345      Get the first in the list.  */
 346   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 347
 348   /* Keep looking until we find a match.  */
 349   start = str;
 350   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 351     {
 352       const CGEN_INSN *insn = ilist->insn;
 353       recognized_mnemonic = 1;
 354
 355 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 356       /* Not usually needed as unsupported opcodes
 357          shouldn't be in the hash lists.  */
 358       /* Is this insn supported by the selected cpu?  */
 359       if (! @arch@_cgen_insn_supported (cd, insn))
 360         continue;
 361 #endif
 362       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 363          chosen immediately.  Instead, it is used during assembler/linker
 364          relaxation if possible.  */
 365       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 366         continue;
 367
 368       str = start;
 369
 370       /* Skip this insn if str doesn't look right lexically.  */
 371       if (CGEN_INSN_RX (insn) != NULL &&
 372           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 373         continue;
 374
 375       /* Allow parse/insert handlers to obtain length of insn.  */
 376       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 377
 378       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 379       if (parse_errmsg != NULL)
 380         continue;
 381
 382       /* ??? 0 is passed for `pc'.  */
 383       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 384                                                  (bfd_vma) 0);
 385       if (insert_errmsg != NULL)
 386         continue;
 387
 388       /* It is up to the caller to actually output the insn and any
 389          queued relocs.  */
 390       return insn;
 391     }
 392
 393   {
 394     static char errbuf[150];
 395 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 396     const char *tmp_errmsg;
 397
 398     /* If requesting verbose error messages, use insert_errmsg.
 399        Failing that, use parse_errmsg.  */
 400     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 401                   parse_errmsg ? parse_errmsg :
 402                   recognized_mnemonic ?
 403                   _("unrecognized form of instruction") :
 404                   _("unrecognized instruction"));
 405
 406     if (strlen (start) > 50)
 407       /* xgettext:c-format */
 408       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 409     else
 410       /* xgettext:c-format */
 411       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 412 #else
 413     if (strlen (start) > 50)
 414       /* xgettext:c-format */
 415       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 416     else
 417       /* xgettext:c-format */
 418       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 419 #endif
 420
 421     *errmsg = errbuf;
 422     return NULL;
 423   }
 424 }