opcodes/cgen-ibld.in

   1 /* Instruction building/extraction support for @arch@. -*- C -*-
   2
   3 THIS FILE IS MACHINE GENERATED WITH CGEN: Cpu tools GENerator.
   4 - the resultant file is machine generated, cgen-ibld.in isn't
   5
   6 Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
   7
   8 This file is part of the GNU Binutils and GDB, the GNU debugger.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2, or (at your option)
  13 any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software Foundation, Inc.,
  22 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 /* ??? Eventually more and more of this stuff can go to cpu-independent files.
  25    Keep that in mind.  */
  26
  27 #include "sysdep.h"
  28 #include <stdio.h>
  29 #include "ansidecl.h"
  30 #include "dis-asm.h"
  31 #include "bfd.h"
  32 #include "symcat.h"
  33 #include "@prefix@-desc.h"
  34 #include "@prefix@-opc.h"
  35 #include "opintl.h"
  36 #include "safe-ctype.h"
  37
  38 #undef min
  39 #define min(a,b) ((a) < (b) ? (a) : (b))
  40 #undef max
  41 #define max(a,b) ((a) > (b) ? (a) : (b))
  42
  43 /* Used by the ifield rtx function.  */
  44 #define FLD(f) (fields->f)
  45
  46 static const char * insert_normal
  47   (CGEN_CPU_DESC, long, unsigned int, unsigned int, unsigned int,
  48    unsigned int, unsigned int, unsigned int, CGEN_INSN_BYTES_PTR);
  49 static const char * insert_insn_normal
  50   (CGEN_CPU_DESC, const CGEN_INSN *,
  51    CGEN_FIELDS *, CGEN_INSN_BYTES_PTR, bfd_vma);
  52 static int extract_normal
  53   (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, CGEN_INSN_INT,
  54    unsigned int, unsigned int, unsigned int, unsigned int,
  55    unsigned int, unsigned int, bfd_vma, long *);
  56 static int extract_insn_normal
  57   (CGEN_CPU_DESC, const CGEN_INSN *, CGEN_EXTRACT_INFO *,
  58    CGEN_INSN_INT, CGEN_FIELDS *, bfd_vma);
  59 #if CGEN_INT_INSN_P
  60 static void put_insn_int_value
  61   (CGEN_CPU_DESC, CGEN_INSN_BYTES_PTR, int, int, CGEN_INSN_INT);
  62 #endif
  63 #if ! CGEN_INT_INSN_P
  64 static CGEN_INLINE void insert_1
  65   (CGEN_CPU_DESC, unsigned long, int, int, int, unsigned char *);
  66 static CGEN_INLINE int fill_cache
  67   (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *,  int, int, bfd_vma);
  68 static CGEN_INLINE long extract_1
  69   (CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, int, int, int, unsigned char *, bfd_vma);
  70 #endif
  71 \f
  72 /* Operand insertion.  */
  73
  74 #if ! CGEN_INT_INSN_P
  75
  76 /* Subroutine of insert_normal.  */
  77
  78 static CGEN_INLINE void
  79 insert_1 (CGEN_CPU_DESC cd,
  80           unsigned long value,
  81           int start,
  82           int length,
  83           int word_length,
  84           unsigned char *bufp)
  85 {
  86   unsigned long x,mask;
  87   int shift;
  88
  89   x = cgen_get_insn_value (cd, bufp, word_length);
  90
  91   /* Written this way to avoid undefined behaviour.  */
  92   mask = (((1L << (length - 1)) - 1) << 1) | 1;
  93   if (CGEN_INSN_LSB0_P)
  94     shift = (start + 1) - length;
  95   else
  96     shift = (word_length - (start + length));
  97   x = (x & ~(mask << shift)) | ((value & mask) << shift);
  98
  99   cgen_put_insn_value (cd, bufp, word_length, (bfd_vma) x);
 100 }
 101
 102 #endif /* ! CGEN_INT_INSN_P */
 103
 104 /* Default insertion routine.
 105
 106    ATTRS is a mask of the boolean attributes.
 107    WORD_OFFSET is the offset in bits from the start of the insn of the value.
 108    WORD_LENGTH is the length of the word in bits in which the value resides.
 109    START is the starting bit number in the word, architecture origin.
 110    LENGTH is the length of VALUE in bits.
 111    TOTAL_LENGTH is the total length of the insn in bits.
 112
 113    The result is an error message or NULL if success.  */
 114
 115 /* ??? This duplicates functionality with bfd's howto table and
 116    bfd_install_relocation.  */
 117 /* ??? This doesn't handle bfd_vma's.  Create another function when
 118    necessary.  */
 119
 120 static const char *
 121 insert_normal (CGEN_CPU_DESC cd,
 122                long value,
 123                unsigned int attrs,
 124                unsigned int word_offset,
 125                unsigned int start,
 126                unsigned int length,
 127                unsigned int word_length,
 128                unsigned int total_length,
 129                CGEN_INSN_BYTES_PTR buffer)
 130 {
 131   static char errbuf[100];
 132   /* Written this way to avoid undefined behaviour.  */
 133   unsigned long mask = (((1L << (length - 1)) - 1) << 1) | 1;
 134
 135   /* If LENGTH is zero, this operand doesn't contribute to the value.  */
 136   if (length == 0)
 137     return NULL;
 138
 139 #if 0
 140   if (CGEN_INT_INSN_P
 141       && word_offset != 0)
 142     abort ();
 143 #endif
 144
 145   if (word_length > 32)
 146     abort ();
 147
 148   /* For architectures with insns smaller than the base-insn-bitsize,
 149      word_length may be too big.  */
 150   if (cd->min_insn_bitsize < cd->base_insn_bitsize)
 151     {
 152       if (word_offset == 0
 153           && word_length > total_length)
 154         word_length = total_length;
 155     }
 156
 157   /* Ensure VALUE will fit.  */
 158   if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGN_OPT))
 159     {
 160       long minval = - (1L << (length - 1));
 161       unsigned long maxval = mask;
 162
 163       if ((value > 0 && (unsigned long) value > maxval)
 164           || value < minval)
 165         {
 166           /* xgettext:c-format */
 167           sprintf (errbuf,
 168                    _("operand out of range (%ld not between %ld and %lu)"),
 169                    value, minval, maxval);
 170           return errbuf;
 171         }
 172     }
 173   else if (! CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED))
 174     {
 175       unsigned long maxval = mask;
 176
 177       if ((unsigned long) value > maxval)
 178         {
 179           /* xgettext:c-format */
 180           sprintf (errbuf,
 181                    _("operand out of range (%lu not between 0 and %lu)"),
 182                    value, maxval);
 183           return errbuf;
 184         }
 185     }
 186   else
 187     {
 188       if (! cgen_signed_overflow_ok_p (cd))
 189         {
 190           long minval = - (1L << (length - 1));
 191           long maxval =   (1L << (length - 1)) - 1;
 192
 193           if (value < minval || value > maxval)
 194             {
 195               sprintf
 196                 /* xgettext:c-format */
 197                 (errbuf, _("operand out of range (%ld not between %ld and %ld)"),
 198                  value, minval, maxval);
 199               return errbuf;
 200             }
 201         }
 202     }
 203
 204 #if CGEN_INT_INSN_P
 205
 206   {
 207     int shift;
 208
 209     if (CGEN_INSN_LSB0_P)
 210       shift = (word_offset + start + 1) - length;
 211     else
 212       shift = total_length - (word_offset + start + length);
 213     *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
 214   }
 215
 216 #else /* ! CGEN_INT_INSN_P */
 217
 218   {
 219     unsigned char *bufp = (unsigned char *) buffer + word_offset / 8;
 220
 221     insert_1 (cd, value, start, length, word_length, bufp);
 222   }
 223
 224 #endif /* ! CGEN_INT_INSN_P */
 225
 226   return NULL;
 227 }
 228
 229 /* Default insn builder (insert handler).
 230    The instruction is recorded in CGEN_INT_INSN_P byte order (meaning
 231    that if CGEN_INSN_BYTES_PTR is an int * and thus, the value is
 232    recorded in host byte order, otherwise BUFFER is an array of bytes
 233    and the value is recorded in target byte order).
 234    The result is an error message or NULL if success.  */
 235
 236 static const char *
 237 insert_insn_normal (CGEN_CPU_DESC cd,
 238                     const CGEN_INSN * insn,
 239                     CGEN_FIELDS * fields,
 240                     CGEN_INSN_BYTES_PTR buffer,
 241                     bfd_vma pc)
 242 {
 243   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 244   unsigned long value;
 245   const CGEN_SYNTAX_CHAR_TYPE * syn;
 246
 247   CGEN_INIT_INSERT (cd);
 248   value = CGEN_INSN_BASE_VALUE (insn);
 249
 250   /* If we're recording insns as numbers (rather than a string of bytes),
 251      target byte order handling is deferred until later.  */
 252
 253 #if CGEN_INT_INSN_P
 254
 255   put_insn_int_value (cd, buffer, cd->base_insn_bitsize,
 256                       CGEN_FIELDS_BITSIZE (fields), value);
 257
 258 #else
 259
 260   cgen_put_insn_value (cd, buffer, min ((unsigned) cd->base_insn_bitsize,
 261                                         (unsigned) CGEN_FIELDS_BITSIZE (fields)),
 262                        value);
 263
 264 #endif /* ! CGEN_INT_INSN_P */
 265
 266   /* ??? It would be better to scan the format's fields.
 267      Still need to be able to insert a value based on the operand though;
 268      e.g. storing a branch displacement that got resolved later.
 269      Needs more thought first.  */
 270
 271   for (syn = CGEN_SYNTAX_STRING (syntax); * syn; ++ syn)
 272     {
 273       const char *errmsg;
 274
 275       if (CGEN_SYNTAX_CHAR_P (* syn))
 276         continue;
 277
 278       errmsg = (* cd->insert_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
 279                                        fields, buffer, pc);
 280       if (errmsg)
 281         return errmsg;
 282     }
 283
 284   return NULL;
 285 }
 286
 287 #if CGEN_INT_INSN_P
 288 /* Cover function to store an insn value into an integral insn.  Must go here
 289  because it needs <prefix>-desc.h for CGEN_INT_INSN_P.  */
 290
 291 static void
 292 put_insn_int_value (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 293                     CGEN_INSN_BYTES_PTR buf,
 294                     int length,
 295                     int insn_length,
 296                     CGEN_INSN_INT value)
 297 {
 298   /* For architectures with insns smaller than the base-insn-bitsize,
 299      length may be too big.  */
 300   if (length > insn_length)
 301     *buf = value;
 302   else
 303     {
 304       int shift = insn_length - length;
 305       /* Written this way to avoid undefined behaviour.  */
 306       CGEN_INSN_INT mask = (((1L << (length - 1)) - 1) << 1) | 1;
 307       *buf = (*buf & ~(mask << shift)) | ((value & mask) << shift);
 308     }
 309 }
 310 #endif
 311 \f
 312 /* Operand extraction.  */
 313
 314 #if ! CGEN_INT_INSN_P
 315
 316 /* Subroutine of extract_normal.
 317    Ensure sufficient bytes are cached in EX_INFO.
 318    OFFSET is the offset in bytes from the start of the insn of the value.
 319    BYTES is the length of the needed value.
 320    Returns 1 for success, 0 for failure.  */
 321
 322 static CGEN_INLINE int
 323 fill_cache (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
 324             CGEN_EXTRACT_INFO *ex_info,
 325             int offset,
 326             int bytes,
 327             bfd_vma pc)
 328 {
 329   /* It's doubtful that the middle part has already been fetched so
 330      we don't optimize that case.  kiss.  */
 331   unsigned int mask;
 332   disassemble_info *info = (disassemble_info *) ex_info->dis_info;
 333
 334   /* First do a quick check.  */
 335   mask = (1 << bytes) - 1;
 336   if (((ex_info->valid >> offset) & mask) == mask)
 337     return 1;
 338
 339   /* Search for the first byte we need to read.  */
 340   for (mask = 1 << offset; bytes > 0; --bytes, ++offset, mask <<= 1)
 341     if (! (mask & ex_info->valid))
 342       break;
 343
 344   if (bytes)
 345     {
 346       int status;
 347
 348       pc += offset;
 349       status = (*info->read_memory_func)
 350         (pc, ex_info->insn_bytes + offset, bytes, info);
 351
 352       if (status != 0)
 353         {
 354           (*info->memory_error_func) (status, pc, info);
 355           return 0;
 356         }
 357
 358       ex_info->valid |= ((1 << bytes) - 1) << offset;
 359     }
 360
 361   return 1;
 362 }
 363
 364 /* Subroutine of extract_normal.  */
 365
 366 static CGEN_INLINE long
 367 extract_1 (CGEN_CPU_DESC cd,
 368            CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED,
 369            int start,
 370            int length,
 371            int word_length,
 372            unsigned char *bufp,
 373            bfd_vma pc ATTRIBUTE_UNUSED)
 374 {
 375   unsigned long x;
 376   int shift;
 377 #if 0
 378   int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
 379 #endif
 380   x = cgen_get_insn_value (cd, bufp, word_length);
 381
 382   if (CGEN_INSN_LSB0_P)
 383     shift = (start + 1) - length;
 384   else
 385     shift = (word_length - (start + length));
 386   return x >> shift;
 387 }
 388
 389 #endif /* ! CGEN_INT_INSN_P */
 390
 391 /* Default extraction routine.
 392
 393    INSN_VALUE is the first base_insn_bitsize bits of the insn in host order,
 394    or sometimes less for cases like the m32r where the base insn size is 32
 395    but some insns are 16 bits.
 396    ATTRS is a mask of the boolean attributes.  We only need `SIGNED',
 397    but for generality we take a bitmask of all of them.
 398    WORD_OFFSET is the offset in bits from the start of the insn of the value.
 399    WORD_LENGTH is the length of the word in bits in which the value resides.
 400    START is the starting bit number in the word, architecture origin.
 401    LENGTH is the length of VALUE in bits.
 402    TOTAL_LENGTH is the total length of the insn in bits.
 403
 404    Returns 1 for success, 0 for failure.  */
 405
 406 /* ??? The return code isn't properly used.  wip.  */
 407
 408 /* ??? This doesn't handle bfd_vma's.  Create another function when
 409    necessary.  */
 410
 411 static int
 412 extract_normal (CGEN_CPU_DESC cd,
 413 #if ! CGEN_INT_INSN_P
 414                 CGEN_EXTRACT_INFO *ex_info,
 415 #else
 416                 CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED,
 417 #endif
 418                 CGEN_INSN_INT insn_value,
 419                 unsigned int attrs,
 420                 unsigned int word_offset,
 421                 unsigned int start,
 422                 unsigned int length,
 423                 unsigned int word_length,
 424                 unsigned int total_length,
 425 #if ! CGEN_INT_INSN_P
 426                 bfd_vma pc,
 427 #else
 428                 bfd_vma pc ATTRIBUTE_UNUSED,
 429 #endif
 430                 long *valuep)
 431 {
 432   long value, mask;
 433
 434   /* If LENGTH is zero, this operand doesn't contribute to the value
 435      so give it a standard value of zero.  */
 436   if (length == 0)
 437     {
 438       *valuep = 0;
 439       return 1;
 440     }
 441
 442 #if 0
 443   if (CGEN_INT_INSN_P
 444       && word_offset != 0)
 445     abort ();
 446 #endif
 447
 448   if (word_length > 32)
 449     abort ();
 450
 451   /* For architectures with insns smaller than the insn-base-bitsize,
 452      word_length may be too big.  */
 453   if (cd->min_insn_bitsize < cd->base_insn_bitsize)
 454     {
 455       if (word_offset == 0
 456           && word_length > total_length)
 457         word_length = total_length;
 458     }
 459
 460   /* Does the value reside in INSN_VALUE, and at the right alignment?  */
 461
 462   if (CGEN_INT_INSN_P || (word_offset == 0 && word_length == total_length))
 463     {
 464       if (CGEN_INSN_LSB0_P)
 465         value = insn_value >> ((word_offset + start + 1) - length);
 466       else
 467         value = insn_value >> (total_length - ( word_offset + start + length));
 468     }
 469
 470 #if ! CGEN_INT_INSN_P
 471
 472   else
 473     {
 474       unsigned char *bufp = ex_info->insn_bytes + word_offset / 8;
 475
 476       if (word_length > 32)
 477         abort ();
 478
 479       if (fill_cache (cd, ex_info, word_offset / 8, word_length / 8, pc) == 0)
 480         return 0;
 481
 482       value = extract_1 (cd, ex_info, start, length, word_length, bufp, pc);
 483     }
 484
 485 #endif /* ! CGEN_INT_INSN_P */
 486
 487   /* Written this way to avoid undefined behaviour.  */
 488   mask = (((1L << (length - 1)) - 1) << 1) | 1;
 489
 490   value &= mask;
 491   /* sign extend? */
 492   if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED)
 493       && (value & (1L << (length - 1))))
 494     value |= ~mask;
 495
 496   *valuep = value;
 497
 498   return 1;
 499 }
 500
 501 /* Default insn extractor.
 502
 503    INSN_VALUE is the first base_insn_bitsize bits, translated to host order.
 504    The extracted fields are stored in FIELDS.
 505    EX_INFO is used to handle reading variable length insns.
 506    Return the length of the insn in bits, or 0 if no match,
 507    or -1 if an error occurs fetching data (memory_error_func will have
 508    been called).  */
 509
 510 static int
 511 extract_insn_normal (CGEN_CPU_DESC cd,
 512                      const CGEN_INSN *insn,
 513                      CGEN_EXTRACT_INFO *ex_info,
 514                      CGEN_INSN_INT insn_value,
 515                      CGEN_FIELDS *fields,
 516                      bfd_vma pc)
 517 {
 518   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 519   const CGEN_SYNTAX_CHAR_TYPE *syn;
 520
 521   CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 522
 523   CGEN_INIT_EXTRACT (cd);
 524
 525   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 526     {
 527       int length;
 528
 529       if (CGEN_SYNTAX_CHAR_P (*syn))
 530         continue;
 531
 532       length = (* cd->extract_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
 533                                         ex_info, insn_value, fields, pc);
 534       if (length <= 0)
 535         return length;
 536     }
 537
 538   /* We recognized and successfully extracted this insn.  */
 539   return CGEN_INSN_BITSIZE (insn);
 540 }
 541 \f
 542 /* machine generated code added here */