opcodes/openrisc-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 "openrisc-desc.h"
  35 #include "openrisc-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
  53 static const char * MISSING_CLOSING_PARENTHESIS = N_("missing `)'");
  54
  55 #define CGEN_VERBOSE_ASSEMBLER_ERRORS
  56
  57 long
  58 openrisc_sign_extend_16bit (long value)
  59 {
  60   return ((value & 0xffff) ^ 0x8000) - 0x8000;
  61 }
  62
  63 /* Handle hi().  */
  64
  65 static const char *
  66 parse_hi16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
  67 {
  68   const char *errmsg;
  69   enum cgen_parse_operand_result result_type;
  70   unsigned long ret;
  71
  72   if (**strp == '#')
  73     ++*strp;
  74
  75   if (strncasecmp (*strp, "hi(", 3) == 0)
  76     {
  77       bfd_vma value;
  78
  79       *strp += 3;
  80       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_HI16,
  81                                    & result_type, & value);
  82       if (**strp != ')')
  83         return MISSING_CLOSING_PARENTHESIS;
  84
  85       ++*strp;
  86       if (errmsg == NULL
  87           && result_type == CGEN_PARSE_OPERAND_RESULT_NUMBER)
  88         value >>= 16;
  89       ret = value;
  90     }
  91   else
  92     {
  93       if (**strp == '-')
  94         {
  95           long value;
  96
  97           errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
  98           ret = value;
  99         }
 100       else
 101         {
 102           unsigned long value;
 103
 104           errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
 105           ret = value;
 106         }
 107     }
 108
 109   *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
 110   return errmsg;
 111 }
 112
 113 /* Handle lo().  */
 114
 115 static const char *
 116 parse_lo16 (CGEN_CPU_DESC cd, const char ** strp, int opindex, long * valuep)
 117 {
 118   const char *errmsg;
 119   enum cgen_parse_operand_result result_type;
 120   unsigned long ret;
 121
 122   if (**strp == '#')
 123     ++*strp;
 124
 125   if (strncasecmp (*strp, "lo(", 3) == 0)
 126     {
 127       bfd_vma value;
 128
 129       *strp += 3;
 130       errmsg = cgen_parse_address (cd, strp, opindex, BFD_RELOC_LO16,
 131                                    & result_type, & value);
 132       if (**strp != ')')
 133         return MISSING_CLOSING_PARENTHESIS;
 134
 135       ++*strp;
 136       ret = value;
 137     }
 138   else
 139     {
 140       if (**strp == '-')
 141         {
 142           long value;
 143
 144           errmsg = cgen_parse_signed_integer (cd, strp, opindex, &value);
 145           ret = value;
 146         }
 147       else
 148         {
 149           unsigned long value;
 150
 151           errmsg = cgen_parse_unsigned_integer (cd, strp, opindex, &value);
 152           ret = value;
 153         }
 154     }
 155
 156   *valuep = ((ret & 0xffff) ^ 0x8000) - 0x8000;
 157   return errmsg;
 158 }
 159
 160 /* -- */
 161
 162 const char * openrisc_cgen_parse_operand
 163   (CGEN_CPU_DESC, int, const char **, CGEN_FIELDS *);
 164
 165 /* Main entry point for operand parsing.
 166
 167    This function is basically just a big switch statement.  Earlier versions
 168    used tables to look up the function to use, but
 169    - if the table contains both assembler and disassembler functions then
 170      the disassembler contains much of the assembler and vice-versa,
 171    - there's a lot of inlining possibilities as things grow,
 172    - using a switch statement avoids the function call overhead.
 173
 174    This function could be moved into `parse_insn_normal', but keeping it
 175    separate makes clear the interface between `parse_insn_normal' and each of
 176    the handlers.  */
 177
 178 const char *
 179 openrisc_cgen_parse_operand (CGEN_CPU_DESC cd,
 180                            int opindex,
 181                            const char ** strp,
 182                            CGEN_FIELDS * fields)
 183 {
 184   const char * errmsg = NULL;
 185   /* Used by scalar operands that still need to be parsed.  */
 186   long junk ATTRIBUTE_UNUSED;
 187
 188   switch (opindex)
 189     {
 190     case OPENRISC_OPERAND_ABS_26 :
 191       {
 192         bfd_vma value = 0;
 193         errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_ABS_26, 0, NULL,  & value);
 194         fields->f_abs26 = value;
 195       }
 196       break;
 197     case OPENRISC_OPERAND_DISP_26 :
 198       {
 199         bfd_vma value = 0;
 200         errmsg = cgen_parse_address (cd, strp, OPENRISC_OPERAND_DISP_26, 0, NULL,  & value);
 201         fields->f_disp26 = value;
 202       }
 203       break;
 204     case OPENRISC_OPERAND_HI16 :
 205       errmsg = parse_hi16 (cd, strp, OPENRISC_OPERAND_HI16, (long *) (& fields->f_simm16));
 206       break;
 207     case OPENRISC_OPERAND_LO16 :
 208       errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_LO16, (long *) (& fields->f_lo16));
 209       break;
 210     case OPENRISC_OPERAND_OP_F_23 :
 211       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_23, (unsigned long *) (& fields->f_op4));
 212       break;
 213     case OPENRISC_OPERAND_OP_F_3 :
 214       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_OP_F_3, (unsigned long *) (& fields->f_op5));
 215       break;
 216     case OPENRISC_OPERAND_RA :
 217       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r2);
 218       break;
 219     case OPENRISC_OPERAND_RB :
 220       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r3);
 221       break;
 222     case OPENRISC_OPERAND_RD :
 223       errmsg = cgen_parse_keyword (cd, strp, & openrisc_cgen_opval_h_gr, & fields->f_r1);
 224       break;
 225     case OPENRISC_OPERAND_SIMM_16 :
 226       errmsg = cgen_parse_signed_integer (cd, strp, OPENRISC_OPERAND_SIMM_16, (long *) (& fields->f_simm16));
 227       break;
 228     case OPENRISC_OPERAND_UI16NC :
 229       errmsg = parse_lo16 (cd, strp, OPENRISC_OPERAND_UI16NC, (long *) (& fields->f_i16nc));
 230       break;
 231     case OPENRISC_OPERAND_UIMM_16 :
 232       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_16, (unsigned long *) (& fields->f_uimm16));
 233       break;
 234     case OPENRISC_OPERAND_UIMM_5 :
 235       errmsg = cgen_parse_unsigned_integer (cd, strp, OPENRISC_OPERAND_UIMM_5, (unsigned long *) (& fields->f_uimm5));
 236       break;
 237
 238     default :
 239       /* xgettext:c-format */
 240       fprintf (stderr, _("Unrecognized field %d while parsing.\n"), opindex);
 241       abort ();
 242   }
 243
 244   return errmsg;
 245 }
 246
 247 cgen_parse_fn * const openrisc_cgen_parse_handlers[] =
 248 {
 249   parse_insn_normal,
 250 };
 251
 252 void
 253 openrisc_cgen_init_asm (CGEN_CPU_DESC cd)
 254 {
 255   openrisc_cgen_init_opcode_table (cd);
 256   openrisc_cgen_init_ibld_table (cd);
 257   cd->parse_handlers = & openrisc_cgen_parse_handlers[0];
 258   cd->parse_operand = openrisc_cgen_parse_operand;
 259 #ifdef CGEN_ASM_INIT_HOOK
 260 CGEN_ASM_INIT_HOOK
 261 #endif
 262 }
 263
 264 \f
 265
 266 /* Regex construction routine.
 267
 268    This translates an opcode syntax string into a regex string,
 269    by replacing any non-character syntax element (such as an
 270    opcode) with the pattern '.*'
 271
 272    It then compiles the regex and stores it in the opcode, for
 273    later use by openrisc_cgen_assemble_insn
 274
 275    Returns NULL for success, an error message for failure.  */
 276
 277 char *
 278 openrisc_cgen_build_insn_regex (CGEN_INSN *insn)
 279 {
 280   CGEN_OPCODE *opc = (CGEN_OPCODE *) CGEN_INSN_OPCODE (insn);
 281   const char *mnem = CGEN_INSN_MNEMONIC (insn);
 282   char rxbuf[CGEN_MAX_RX_ELEMENTS];
 283   char *rx = rxbuf;
 284   const CGEN_SYNTAX_CHAR_TYPE *syn;
 285   int reg_err;
 286
 287   syn = CGEN_SYNTAX_STRING (CGEN_OPCODE_SYNTAX (opc));
 288
 289   /* Mnemonics come first in the syntax string.  */
 290   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 291     return _("missing mnemonic in syntax string");
 292   ++syn;
 293
 294   /* Generate a case sensitive regular expression that emulates case
 295      insensitive matching in the "C" locale.  We cannot generate a case
 296      insensitive regular expression because in Turkish locales, 'i' and 'I'
 297      are not equal modulo case conversion.  */
 298
 299   /* Copy the literal mnemonic out of the insn.  */
 300   for (; *mnem; mnem++)
 301     {
 302       char c = *mnem;
 303
 304       if (ISALPHA (c))
 305         {
 306           *rx++ = '[';
 307           *rx++ = TOLOWER (c);
 308           *rx++ = TOUPPER (c);
 309           *rx++ = ']';
 310         }
 311       else
 312         *rx++ = c;
 313     }
 314
 315   /* Copy any remaining literals from the syntax string into the rx.  */
 316   for(; * syn != 0 && rx <= rxbuf + (CGEN_MAX_RX_ELEMENTS - 7 - 4); ++syn)
 317     {
 318       if (CGEN_SYNTAX_CHAR_P (* syn))
 319         {
 320           char c = CGEN_SYNTAX_CHAR (* syn);
 321
 322           switch (c)
 323             {
 324               /* Escape any regex metacharacters in the syntax.  */
 325             case '.': case '[': case '\\':
 326             case '*': case '^': case '$':
 327
 328 #ifdef CGEN_ESCAPE_EXTENDED_REGEX
 329             case '?': case '{': case '}':
 330             case '(': case ')': case '*':
 331             case '|': case '+': case ']':
 332 #endif
 333               *rx++ = '\\';
 334               *rx++ = c;
 335               break;
 336
 337             default:
 338               if (ISALPHA (c))
 339                 {
 340                   *rx++ = '[';
 341                   *rx++ = TOLOWER (c);
 342                   *rx++ = TOUPPER (c);
 343                   *rx++ = ']';
 344                 }
 345               else
 346                 *rx++ = c;
 347               break;
 348             }
 349         }
 350       else
 351         {
 352           /* Replace non-syntax fields with globs.  */
 353           *rx++ = '.';
 354           *rx++ = '*';
 355         }
 356     }
 357
 358   /* Trailing whitespace ok.  */
 359   * rx++ = '[';
 360   * rx++ = ' ';
 361   * rx++ = '\t';
 362   * rx++ = ']';
 363   * rx++ = '*';
 364
 365   /* But anchor it after that.  */
 366   * rx++ = '$';
 367   * rx = '\0';
 368
 369   CGEN_INSN_RX (insn) = xmalloc (sizeof (regex_t));
 370   reg_err = regcomp ((regex_t *) CGEN_INSN_RX (insn), rxbuf, REG_NOSUB);
 371
 372   if (reg_err == 0)
 373     return NULL;
 374   else
 375     {
 376       static char msg[80];
 377
 378       regerror (reg_err, (regex_t *) CGEN_INSN_RX (insn), msg, 80);
 379       regfree ((regex_t *) CGEN_INSN_RX (insn));
 380       free (CGEN_INSN_RX (insn));
 381       (CGEN_INSN_RX (insn)) = NULL;
 382       return msg;
 383     }
 384 }
 385
 386 \f
 387 /* Default insn parser.
 388
 389    The syntax string is scanned and operands are parsed and stored in FIELDS.
 390    Relocs are queued as we go via other callbacks.
 391
 392    ??? Note that this is currently an all-or-nothing parser.  If we fail to
 393    parse the instruction, we return 0 and the caller will start over from
 394    the beginning.  Backtracking will be necessary in parsing subexpressions,
 395    but that can be handled there.  Not handling backtracking here may get
 396    expensive in the case of the m68k.  Deal with later.
 397
 398    Returns NULL for success, an error message for failure.  */
 399
 400 static const char *
 401 parse_insn_normal (CGEN_CPU_DESC cd,
 402                    const CGEN_INSN *insn,
 403                    const char **strp,
 404                    CGEN_FIELDS *fields)
 405 {
 406   /* ??? Runtime added insns not handled yet.  */
 407   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 408   const char *str = *strp;
 409   const char *errmsg;
 410   const char *p;
 411   const CGEN_SYNTAX_CHAR_TYPE * syn;
 412 #ifdef CGEN_MNEMONIC_OPERANDS
 413   /* FIXME: wip */
 414   int past_opcode_p;
 415 #endif
 416
 417   /* For now we assume the mnemonic is first (there are no leading operands).
 418      We can parse it without needing to set up operand parsing.
 419      GAS's input scrubber will ensure mnemonics are lowercase, but we may
 420      not be called from GAS.  */
 421   p = CGEN_INSN_MNEMONIC (insn);
 422   while (*p && TOLOWER (*p) == TOLOWER (*str))
 423     ++p, ++str;
 424
 425   if (* p)
 426     return _("unrecognized instruction");
 427
 428 #ifndef CGEN_MNEMONIC_OPERANDS
 429   if (* str && ! ISSPACE (* str))
 430     return _("unrecognized instruction");
 431 #endif
 432
 433   CGEN_INIT_PARSE (cd);
 434   cgen_init_parse_operand (cd);
 435 #ifdef CGEN_MNEMONIC_OPERANDS
 436   past_opcode_p = 0;
 437 #endif
 438
 439   /* We don't check for (*str != '\0') here because we want to parse
 440      any trailing fake arguments in the syntax string.  */
 441   syn = CGEN_SYNTAX_STRING (syntax);
 442
 443   /* Mnemonics come first for now, ensure valid string.  */
 444   if (! CGEN_SYNTAX_MNEMONIC_P (* syn))
 445     abort ();
 446
 447   ++syn;
 448
 449   while (* syn != 0)
 450     {
 451       /* Non operand chars must match exactly.  */
 452       if (CGEN_SYNTAX_CHAR_P (* syn))
 453         {
 454           /* FIXME: While we allow for non-GAS callers above, we assume the
 455              first char after the mnemonic part is a space.  */
 456           /* FIXME: We also take inappropriate advantage of the fact that
 457              GAS's input scrubber will remove extraneous blanks.  */
 458           if (TOLOWER (*str) == TOLOWER (CGEN_SYNTAX_CHAR (* syn)))
 459             {
 460 #ifdef CGEN_MNEMONIC_OPERANDS
 461               if (CGEN_SYNTAX_CHAR(* syn) == ' ')
 462                 past_opcode_p = 1;
 463 #endif
 464               ++ syn;
 465               ++ str;
 466             }
 467           else if (*str)
 468             {
 469               /* Syntax char didn't match.  Can't be this insn.  */
 470               static char msg [80];
 471
 472               /* xgettext:c-format */
 473               sprintf (msg, _("syntax error (expected char `%c', found `%c')"),
 474                        CGEN_SYNTAX_CHAR(*syn), *str);
 475               return msg;
 476             }
 477           else
 478             {
 479               /* Ran out of input.  */
 480               static char msg [80];
 481
 482               /* xgettext:c-format */
 483               sprintf (msg, _("syntax error (expected char `%c', found end of instruction)"),
 484                        CGEN_SYNTAX_CHAR(*syn));
 485               return msg;
 486             }
 487           continue;
 488         }
 489
 490       /* We have an operand of some sort.  */
 491       errmsg = cd->parse_operand (cd, CGEN_SYNTAX_FIELD (*syn),
 492                                           &str, fields);
 493       if (errmsg)
 494         return errmsg;
 495
 496       /* Done with this operand, continue with next one.  */
 497       ++ syn;
 498     }
 499
 500   /* If we're at the end of the syntax string, we're done.  */
 501   if (* syn == 0)
 502     {
 503       /* FIXME: For the moment we assume a valid `str' can only contain
 504          blanks now.  IE: We needn't try again with a longer version of
 505          the insn and it is assumed that longer versions of insns appear
 506          before shorter ones (eg: lsr r2,r3,1 vs lsr r2,r3).  */
 507       while (ISSPACE (* str))
 508         ++ str;
 509
 510       if (* str != '\0')
 511         return _("junk at end of line"); /* FIXME: would like to include `str' */
 512
 513       return NULL;
 514     }
 515
 516   /* We couldn't parse it.  */
 517   return _("unrecognized instruction");
 518 }
 519 \f
 520 /* Main entry point.
 521    This routine is called for each instruction to be assembled.
 522    STR points to the insn to be assembled.
 523    We assume all necessary tables have been initialized.
 524    The assembled instruction, less any fixups, is stored in BUF.
 525    Remember that if CGEN_INT_INSN_P then BUF is an int and thus the value
 526    still needs to be converted to target byte order, otherwise BUF is an array
 527    of bytes in target byte order.
 528    The result is a pointer to the insn's entry in the opcode table,
 529    or NULL if an error occured (an error message will have already been
 530    printed).
 531
 532    Note that when processing (non-alias) macro-insns,
 533    this function recurses.
 534
 535    ??? It's possible to make this cpu-independent.
 536    One would have to deal with a few minor things.
 537    At this point in time doing so would be more of a curiosity than useful
 538    [for example this file isn't _that_ big], but keeping the possibility in
 539    mind helps keep the design clean.  */
 540
 541 const CGEN_INSN *
 542 openrisc_cgen_assemble_insn (CGEN_CPU_DESC cd,
 543                            const char *str,
 544                            CGEN_FIELDS *fields,
 545                            CGEN_INSN_BYTES_PTR buf,
 546                            char **errmsg)
 547 {
 548   const char *start;
 549   CGEN_INSN_LIST *ilist;
 550   const char *parse_errmsg = NULL;
 551   const char *insert_errmsg = NULL;
 552   int recognized_mnemonic = 0;
 553
 554   /* Skip leading white space.  */
 555   while (ISSPACE (* str))
 556     ++ str;
 557
 558   /* The instructions are stored in hashed lists.
 559      Get the first in the list.  */
 560   ilist = CGEN_ASM_LOOKUP_INSN (cd, str);
 561
 562   /* Keep looking until we find a match.  */
 563   start = str;
 564   for ( ; ilist != NULL ; ilist = CGEN_ASM_NEXT_INSN (ilist))
 565     {
 566       const CGEN_INSN *insn = ilist->insn;
 567       recognized_mnemonic = 1;
 568
 569 #ifdef CGEN_VALIDATE_INSN_SUPPORTED
 570       /* Not usually needed as unsupported opcodes
 571          shouldn't be in the hash lists.  */
 572       /* Is this insn supported by the selected cpu?  */
 573       if (! openrisc_cgen_insn_supported (cd, insn))
 574         continue;
 575 #endif
 576       /* If the RELAXED attribute is set, this is an insn that shouldn't be
 577          chosen immediately.  Instead, it is used during assembler/linker
 578          relaxation if possible.  */
 579       if (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAXED) != 0)
 580         continue;
 581
 582       str = start;
 583
 584       /* Skip this insn if str doesn't look right lexically.  */
 585       if (CGEN_INSN_RX (insn) != NULL &&
 586           regexec ((regex_t *) CGEN_INSN_RX (insn), str, 0, NULL, 0) == REG_NOMATCH)
 587         continue;
 588
 589       /* Allow parse/insert handlers to obtain length of insn.  */
 590       CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 591
 592       parse_errmsg = CGEN_PARSE_FN (cd, insn) (cd, insn, & str, fields);
 593       if (parse_errmsg != NULL)
 594         continue;
 595
 596       /* ??? 0 is passed for `pc'.  */
 597       insert_errmsg = CGEN_INSERT_FN (cd, insn) (cd, insn, fields, buf,
 598                                                  (bfd_vma) 0);
 599       if (insert_errmsg != NULL)
 600         continue;
 601
 602       /* It is up to the caller to actually output the insn and any
 603          queued relocs.  */
 604       return insn;
 605     }
 606
 607   {
 608     static char errbuf[150];
 609 #ifdef CGEN_VERBOSE_ASSEMBLER_ERRORS
 610     const char *tmp_errmsg;
 611
 612     /* If requesting verbose error messages, use insert_errmsg.
 613        Failing that, use parse_errmsg.  */
 614     tmp_errmsg = (insert_errmsg ? insert_errmsg :
 615                   parse_errmsg ? parse_errmsg :
 616                   recognized_mnemonic ?
 617                   _("unrecognized form of instruction") :
 618                   _("unrecognized instruction"));
 619
 620     if (strlen (start) > 50)
 621       /* xgettext:c-format */
 622       sprintf (errbuf, "%s `%.50s...'", tmp_errmsg, start);
 623     else
 624       /* xgettext:c-format */
 625       sprintf (errbuf, "%s `%.50s'", tmp_errmsg, start);
 626 #else
 627     if (strlen (start) > 50)
 628       /* xgettext:c-format */
 629       sprintf (errbuf, _("bad instruction `%.50s...'"), start);
 630     else
 631       /* xgettext:c-format */
 632       sprintf (errbuf, _("bad instruction `%.50s'"), start);
 633 #endif
 634
 635     *errmsg = errbuf;
 636     return NULL;
 637   }
 638 }