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, 2007
   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 "@prefix@-desc.h"
  36 #include "@prefix@-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 \f
  52
  53 /* Regex construction routine.
  54
  55    This translates an opcode syntax string into a regex string,
  56    by replacing any non-character syntax element (such as an
  57    opcode) with the pattern '.*'
  58
  59    It then compiles the regex and stores it in the opcode, for
  60    later use by @arch@_cgen_assemble_insn
  61
  62    Returns NULL for success, an error message for failure.  */
  63
  64 char *
  65 @arch@_cgen_build_insn_regex (CGEN_INSN *insn)
  66 {
  67   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
  68   const char *mnem = CGEN_INSN_MNEMONIC (insn);
  69   char rxbuf[CGEN_MAX_RX_ELEMENTS];
  70   char *rx = rxbuf;
  71   const CGEN_SYNTAX_CHAR_TYPE *syn;
  72   int reg_err;
  73
  74   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
  75
  76   /* Mnemonics come first in the syntax string.  */
  77   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
  78     return _("missing mnemonic in syntax string");
  79   ++syn;
  80
  81   /* Generate a case sensitive regular expression that emulates case
  82      insensitive matching in the "C" locale.  We cannot generate a case
  83      insensitive regular expression because in Turkish locales, 'i' and 'I'
  84      are not equal modulo case conversion.  */
  85
  86   /* Copy the literal mnemonic out of the insn.  */
  87   for (; *mnem; mnem++)
  88     {
  89       char c = *mnem;
  90
  91       if (ISALPHA (c))
  92         {
  93           *rx++ = '[';
  94           *rx++ = TOLOWER (c);
  95           *rx++ = TOUPPER (c);
  96           *rx++ = ']';
  97         }
  98       else
  99         *rx++ = c;
 100     }
 101
 102   /* Copy any remaining literals from the syntax string into the rx.  */
 103   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 104     {
 105       if (CGEN_SYNTAX_CHAR_P (* syn))
 106         {
 107           char c = CGEN_SYNTAX_CHAR (* syn);
 108
 109           switch (c)
 110             {
 111               /* Escape any regex metacharacters in the syntax.  */
 112             case '.': case '[': case '\\':
 113             case '*': case '^': case '$':
 114
 115 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 116             case '?': case '{': case '}':
 117             case '(': case ')': case '*':
 118             case '|': case '+': case ']':
 119 #endif
 120               *rx++ = '\\';
 121               *rx++ = c;
 122               break;
 123
 124             default:
 125               if (ISALPHA (c))
 126                 {
 127                   *rx++ = '[';
 128                   *rx++ = TOLOWER (c);
 129                   *rx++ = TOUPPER (c);
 130                   *rx++ = ']';
 131                 }
 132               else
 133                 *rx++ = c;
 134               break;
 135             }
 136         }
 137       else
 138         {
 139           /* Replace non-syntax fields with globs.  */
 140           *rx++ = '.';
 141           *rx++ = '*';
 142         }
 143     }
 144
 145   /* Trailing whitespace ok.  */
 146   * rx++ = '[';
 147   * rx++ = ' ';
 148   * rx++ = '\t';
 149   * rx++ = ']';
 150   * rx++ = '*';
 151
 152   /* But anchor it after that.  */
 153   * rx++ = '$';
 154   * rx = '\0';
 155
 156   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 157   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 158
 159   if (reg_err == 0)
 160     return NULL;
 161   else
 162     {
 163       static char msg[80];
 164
 165       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 166       regfree ((regex_t *) CGEN_INSN_RX (insn));
 167       free (CGEN_INSN_RX (insn));
 168       (CGEN_INSN_RX (insn)) = NULL;
 169       return msg;
 170     }
 171 }
 172
 173 \f
 174 /* Default insn parser.
 175
 176    The syntax string is scanned and operands are parsed and stored in FIELDS.
 177    Relocs are queued as we go via other callbacks.
 178
 179    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 180    parse the instruction, we return 0 and the caller will start over from
 181    the beginning.  Backtracking will be necessary in parsing subexpressions,
 182    but that can be handled there.  Not handling backtracking here may get
 183    expensive in the case of the m68k.  Deal with later.
 184
 185    Returns NULL for success, an error message for failure.  */
 186
 187 static const char *
 188 parse_insn_normal (CGEN_CPU_DESC cd,
 189                    const CGEN_INSN *insn,
 190                    const char **strp,
 191                    CGEN_FIELDS *fields)
 192 {
 193   /* ??? Runtime added insns not handled yet.  */
 194   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 195   const char *str = *strp;
 196   const char *errmsg;
 197   const char *p;
 198   const CGEN_SYNTAX_CHAR_TYPE * syn;
 199 #ifdef CGEN_MNEMONIC_OPERANDS
 200   /* FIXME: wip */
 201   int past_opcode_p;
 202 #endif
 203
 204   /* For now we assume the mnemonic is first (there are no leading operands).
 205      We can parse it without needing to set up operand parsing.
 206      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 207      not be called from GAS.  */
 208   p = CGEN_INSN_MNEMONIC (insn);
 209   while (*p && TOLOWER (*p) == TOLOWER (*str))
 210     ++p, ++str;
 211
 212   if (* p)
 213     return _("unrecognized instruction");
 214
 215 #ifndef CGEN_MNEMONIC_OPERANDS
 216   if (* str && ! ISSPACE (* str))
 217     return _("unrecognized instruction");
 218 #endif
 219
 220   CGEN_INIT_PARSE (cd);
 221   cgen_init_parse_operand (cd);
 222 #ifdef CGEN_MNEMONIC_OPERANDS
 223   past_opcode_p = 0;
 224 #endif
 225
 226   /* We don't check for (*str != '\0') here because we want to parse
 227      any trailing fake arguments in the syntax string.  */
 228   syn = CGEN_SYNTAX_STRING (syntax);
 229
 230   /* Mnemonics come first for now, ensure valid string.  */
 231   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 232     abort ();
 233
 234   ++syn;
 235
 236   while (* syn != 0)
 237     {
 238       /* Non operand chars must match exactly.  */
 239       if (CGEN_SYNTAX_CHAR_P (* syn))
 240         {
 241           /* FIXME: While we allow for non-GAS callers above, we assume the
 242              first char after the mnemonic part is a space.  */
 243           /* FIXME: We also take inappropriate advantage of the fact that
 244              GAS's input scrubber will remove extraneous blanks.  */
 245           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 246             {
 247 #ifdef CGEN_MNEMONIC_OPERANDS
 248               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 249                 past_opcode_p = 1;
 250 #endif
 251               ++ syn;
 252               ++ str;
 253             }
 254           else if (*str)
 255             {
 256               /* Syntax char didn't match.  Can't be this insn.  */
 257               static char msg [80];
 258
 259               /* xgettext:c-format */
 260               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 261                        CGEN_SYNTAX_CHAR(*syn), *str);
 262               return msg;
 263             }
 264           else
 265             {
 266               /* Ran out of input.  */
 267               static char msg [80];
 268
 269               /* xgettext:c-format */
 270               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 271                        CGEN_SYNTAX_CHAR(*syn));
 272               return msg;
 273             }
 274           continue;
 275         }
 276
 277       /* We have an operand of some sort.  */
 278       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 279                                           &str, fields);
 280       if (errmsg)
 281         return errmsg;
 282
 283       /* Done with this operand, continue with next one.  */
 284       ++ syn;
 285     }
 286
 287   /* If we're at the end of the syntax string, we're done.  */
 288   if (* syn == 0)
 289     {
 290       /* FIXME: For the moment we assume a valid `str' can only contain
 291          blanks now.  IE: We needn't try again with a longer version of
 292          the insn and it is assumed that longer versions of insns appear
 293          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 294       while (ISSPACE (* str))
 295         ++ str;
 296
 297       if (* str != '\0')
 298         return _("junk at end of line"); /* FIXME: would like to include `str' */
 299
 300       return NULL;
 301     }
 302
 303   /* We couldn't parse it.  */
 304   return _("unrecognized instruction");
 305 }
 306 \f
 307 /* Main entry point.
 308    This routine is called for each instruction to be assembled.
 309    STR points to the insn to be assembled.
 310    We assume all necessary tables have been initialized.
 311    The assembled instruction, less any fixups, is stored in BUF.
 312    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 313    still needs to be converted to target byte order, otherwise BUF is an array
 314    of bytes in target byte order.
 315    The result is a pointer to the insn's entry in the opcode table,
 316    or NULL if an error occured (an error message will have already been
 317    printed).
 318
 319    Note that when processing (non-alias) macro-insns,
 320    this function recurses.
 321
 322    ??? It's possible to make this cpu-independent.
 323    One would have to deal with a few minor things.
 324    At this point in time doing so would be more of a curiosity than useful
 325    [for example this file isn't _that_ big], but keeping the possibility in
 326    mind helps keep the design clean.  */
 327
 328 const CGEN_INSN *
 329 @arch@_cgen_assemble_insn (CGEN_CPU_DESC cd,
 330                            const char *str,
 331                            CGEN_FIELDS *fields,
 332                            CGEN_INSN_BYTES_PTR buf,
 333                            char **errmsg)
 334 {
 335   const char *start;
 336   CGEN_INSN_LIST *ilist;
 337   const char *parse_errmsg = NULL;
 338   const char *insert_errmsg = NULL;
 339   int recognized_mnemonic = 0;
 340
 341   /* Skip leading white space.  */
 342   while (ISSPACE (* str))
 343     ++ str;
 344
 345   /* The instructions are stored in hashed lists.
 346      Get the first in the list.  */
 347   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 348
 349   /* Keep looking until we find a match.  */
 350   start = str;
 351   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 352     {
 353       const CGEN_INSN *insn = ilist->insn;
 354       recognized_mnemonic = 1;
 355
 356 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 357       /* Not usually needed as unsupported opcodes
 358          shouldn't be in the hash lists.  */
 359       /* Is this insn supported by the selected cpu?  */
 360       if (! @arch@_cgen_insn_supported (cd, insn))
 361         continue;
 362 #endif
 363       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 364          chosen immediately.  Instead, it is used during assembler/linker
 365          relaxation if possible.  */
 366       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 367         continue;
 368
 369       str = start;
 370
 371       /* Skip this insn if str doesn't look right lexically.  */
 372       if (CGEN_INSN_RX (insn) != NULL &&
 373           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 374         continue;
 375
 376       /* Allow parse/insert handlers to obtain length of insn.  */
 377       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 378
 379       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 380       if (parse_errmsg != NULL)
 381         continue;
 382
 383       /* ??? 0 is passed for `pc'.  */
 384       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 385                                                  (bfd_vma) 0);
 386       if (insert_errmsg != NULL)
 387         continue;
 388
 389       /* It is up to the caller to actually output the insn and any
 390          queued relocs.  */
 391       return insn;
 392     }
 393
 394   {
 395     static char errbuf[150];
 396 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 397     const char *tmp_errmsg;
 398
 399     /* If requesting verbose error messages, use insert_errmsg.
 400        Failing that, use parse_errmsg.  */
 401     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 402                   parse_errmsg ? parse_errmsg :
 403                   recognized_mnemonic ?
 404                   _("unrecognized form of instruction") :
 405                   _("unrecognized instruction"));
 406
 407     if (strlen (start) > 50)
 408       /* xgettext:c-format */
 409       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 410     else
 411       /* xgettext:c-format */
 412       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 413 #else
 414     if (strlen (start) > 50)
 415       /* xgettext:c-format */
 416       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 417     else
 418       /* xgettext:c-format */
 419       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 420 #endif
 421
 422     *errmsg = errbuf;
 423     return NULL;
 424   }
 425 }