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