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 = cgen_get_insn_value (cd, bufp, word_length);
  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   cgen_put_insn_value (cd, bufp, word_length, (bfd_vma) x);
  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_SIGN_OPT))
 149     {
 150       long minval = - (1L << (length - 1));
 151       unsigned long maxval = mask;
 152
 153       if ((value > 0 && (unsigned long) value > maxval)
 154           || value < minval)
 155         {
 156           /* xgettext:c-format */
 157           sprintf (errbuf,
 158                    _("operand out of range (%ld not between %ld and %lu)"),
 159                    value, minval, maxval);
 160           return errbuf;
 161         }
 162     }
 163   else if (! CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED))
 164     {
 165       unsigned long maxval = mask;
 166
 167       if ((unsigned long) value > maxval)
 168         {
 169           /* xgettext:c-format */
 170           sprintf (errbuf,
 171                    _("operand out of range (%lu not between 0 and %lu)"),
 172                    value, maxval);
 173           return errbuf;
 174         }
 175     }
 176   else
 177     {
 178       if (! cgen_signed_overflow_ok_p (cd))
 179         {
 180           long minval = - (1L << (length - 1));
 181           long maxval =   (1L << (length - 1)) - 1;
 182
 183           if (value < minval || value > maxval)
 184             {
 185               sprintf
 186                 /* xgettext:c-format */
 187                 (errbuf, _("operand out of range (%ld not between %ld and %ld)"),
 188                  value, minval, maxval);
 189               return errbuf;
 190             }
 191         }
 192     }
 193
 194 #if CGEN_INT_INSN_P
 195
 196   {
 197     int shift;
 198
 199     if (CGEN_INSN_LSB0_P)
 200       shift = (word_offset + start + 1) - length;
 201     else
 202       shift = total_length - (word_offset + start + length);
 203     *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);
 204   }
 205
 206 #else /* ! CGEN_INT_INSN_P */
 207
 208   {
 209     unsigned char *bufp = (unsigned char *) buffer + word_offset / 8;
 210
 211     insert_1 (cd, value, start, length, word_length, bufp);
 212   }
 213
 214 #endif /* ! CGEN_INT_INSN_P */
 215
 216   return NULL;
 217 }
 218
 219 /* Default insn builder (insert handler).
 220    The instruction is recorded in CGEN_INT_INSN_P byte order (meaning
 221    that if CGEN_INSN_BYTES_PTR is an int * and thus, the value is
 222    recorded in host byte order, otherwise BUFFER is an array of bytes
 223    and the value is recorded in target byte order).
 224    The result is an error message or NULL if success.  */
 225
 226 static const char *
 227 insert_insn_normal (cd, insn, fields, buffer, pc)
 228      CGEN_CPU_DESC cd;
 229      const CGEN_INSN * insn;
 230      CGEN_FIELDS * fields;
 231      CGEN_INSN_BYTES_PTR buffer;
 232      bfd_vma pc;
 233 {
 234   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 235   unsigned long value;
 236   const CGEN_SYNTAX_CHAR_TYPE * syn;
 237
 238   CGEN_INIT_INSERT (cd);
 239   value = CGEN_INSN_BASE_VALUE (insn);
 240
 241   /* If we're recording insns as numbers (rather than a string of bytes),
 242      target byte order handling is deferred until later.  */
 243
 244 #if CGEN_INT_INSN_P
 245
 246   put_insn_int_value (cd, buffer, cd->base_insn_bitsize,
 247                       CGEN_FIELDS_BITSIZE (fields), value);
 248
 249 #else
 250
 251   cgen_put_insn_value (cd, buffer, min (cd->base_insn_bitsize,
 252                                         CGEN_FIELDS_BITSIZE (fields)),
 253                        value);
 254
 255 #endif /* ! CGEN_INT_INSN_P */
 256
 257   /* ??? It would be better to scan the format's fields.
 258      Still need to be able to insert a value based on the operand though;
 259      e.g. storing a branch displacement that got resolved later.
 260      Needs more thought first.  */
 261
 262   for (syn = CGEN_SYNTAX_STRING (syntax); * syn; ++ syn)
 263     {
 264       const char *errmsg;
 265
 266       if (CGEN_SYNTAX_CHAR_P (* syn))
 267         continue;
 268
 269       errmsg = (* cd->insert_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
 270                                        fields, buffer, pc);
 271       if (errmsg)
 272         return errmsg;
 273     }
 274
 275   return NULL;
 276 }
 277
 278 /* Cover function to store an insn value into an integral insn.  Must go here
 279  because it needs <prefix>-desc.h for CGEN_INT_INSN_P.  */
 280
 281 static void
 282 put_insn_int_value (cd, buf, length, insn_length, value)
 283      CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;
 284      CGEN_INSN_BYTES_PTR buf;
 285      int length;
 286      int insn_length;
 287      CGEN_INSN_INT value;
 288 {
 289   /* For architectures with insns smaller than the base-insn-bitsize,
 290      length may be too big.  */
 291   if (length > insn_length)
 292     *buf = value;
 293   else
 294     {
 295       int shift = insn_length - length;
 296       /* Written this way to avoid undefined behaviour.  */
 297       CGEN_INSN_INT mask = (((1L << (length - 1)) - 1) << 1) | 1;
 298       *buf = (*buf & ~(mask << shift)) | ((value & mask) << shift);
 299     }
 300 }
 301 \f
 302 /* Operand extraction.  */
 303
 304 #if ! CGEN_INT_INSN_P
 305
 306 /* Subroutine of extract_normal.
 307    Ensure sufficient bytes are cached in EX_INFO.
 308    OFFSET is the offset in bytes from the start of the insn of the value.
 309    BYTES is the length of the needed value.
 310    Returns 1 for success, 0 for failure.  */
 311
 312 static CGEN_INLINE int
 313 fill_cache (cd, ex_info, offset, bytes, pc)
 314      CGEN_CPU_DESC cd;
 315      CGEN_EXTRACT_INFO *ex_info;
 316      int offset, bytes;
 317      bfd_vma pc;
 318 {
 319   /* It's doubtful that the middle part has already been fetched so
 320      we don't optimize that case.  kiss.  */
 321   int mask;
 322   disassemble_info *info = (disassemble_info *) ex_info->dis_info;
 323
 324   /* First do a quick check.  */
 325   mask = (1 << bytes) - 1;
 326   if (((ex_info->valid >> offset) & mask) == mask)
 327     return 1;
 328
 329   /* Search for the first byte we need to read.  */
 330   for (mask = 1 << offset; bytes > 0; --bytes, ++offset, mask <<= 1)
 331     if (! (mask & ex_info->valid))
 332       break;
 333
 334   if (bytes)
 335     {
 336       int status;
 337
 338       pc += offset;
 339       status = (*info->read_memory_func)
 340         (pc, ex_info->insn_bytes + offset, bytes, info);
 341
 342       if (status != 0)
 343         {
 344           (*info->memory_error_func) (status, pc, info);
 345           return 0;
 346         }
 347
 348       ex_info->valid |= ((1 << bytes) - 1) << offset;
 349     }
 350
 351   return 1;
 352 }
 353
 354 /* Subroutine of extract_normal.  */
 355
 356 static CGEN_INLINE long
 357 extract_1 (cd, ex_info, start, length, word_length, bufp, pc)
 358      CGEN_CPU_DESC cd;
 359      CGEN_EXTRACT_INFO *ex_info;
 360      int start,length,word_length;
 361      unsigned char *bufp;
 362      bfd_vma pc;
 363 {
 364   unsigned long x;
 365   int shift;
 366   int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;
 367
 368   x = cgen_get_insn_value (cd, bufp, word_length);
 369
 370   if (CGEN_INSN_LSB0_P)
 371     shift = (start + 1) - length;
 372   else
 373     shift = (word_length - (start + length));
 374   return x >> shift;
 375 }
 376
 377 #endif /* ! CGEN_INT_INSN_P */
 378
 379 /* Default extraction routine.
 380
 381    INSN_VALUE is the first base_insn_bitsize bits of the insn in host order,
 382    or sometimes less for cases like the m32r where the base insn size is 32
 383    but some insns are 16 bits.
 384    ATTRS is a mask of the boolean attributes.  We only need `SIGNED',
 385    but for generality we take a bitmask of all of them.
 386    WORD_OFFSET is the offset in bits from the start of the insn of the value.
 387    WORD_LENGTH is the length of the word in bits in which the value resides.
 388    START is the starting bit number in the word, architecture origin.
 389    LENGTH is the length of VALUE in bits.
 390    TOTAL_LENGTH is the total length of the insn in bits.
 391
 392    Returns 1 for success, 0 for failure.  */
 393
 394 /* ??? The return code isn't properly used.  wip.  */
 395
 396 /* ??? This doesn't handle bfd_vma's.  Create another function when
 397    necessary.  */
 398
 399 static int
 400 extract_normal (cd, ex_info, insn_value, attrs, word_offset, start, length,
 401                 word_length, total_length, pc, valuep)
 402      CGEN_CPU_DESC cd;
 403 #if ! CGEN_INT_INSN_P
 404      CGEN_EXTRACT_INFO *ex_info;
 405 #else
 406      CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED;
 407 #endif
 408      CGEN_INSN_INT insn_value;
 409      unsigned int attrs;
 410      unsigned int word_offset, start, length, word_length, total_length;
 411 #if ! CGEN_INT_INSN_P
 412      bfd_vma pc;
 413 #else
 414      bfd_vma pc ATTRIBUTE_UNUSED;
 415 #endif
 416      long *valuep;
 417 {
 418   long value, mask;
 419
 420   /* If LENGTH is zero, this operand doesn't contribute to the value
 421      so give it a standard value of zero.  */
 422   if (length == 0)
 423     {
 424       *valuep = 0;
 425       return 1;
 426     }
 427
 428 #if 0
 429   if (CGEN_INT_INSN_P
 430       && word_offset != 0)
 431     abort ();
 432 #endif
 433
 434   if (word_length > 32)
 435     abort ();
 436
 437   /* For architectures with insns smaller than the insn-base-bitsize,
 438      word_length may be too big.  */
 439   if (cd->min_insn_bitsize < cd->base_insn_bitsize)
 440     {
 441       if (word_offset == 0
 442           && word_length > total_length)
 443         word_length = total_length;
 444     }
 445
 446   /* Does the value reside in INSN_VALUE, and at the right alignment?  */
 447
 448   if (CGEN_INT_INSN_P || (word_offset == 0 && word_length == total_length))
 449     {
 450       if (CGEN_INSN_LSB0_P)
 451         value = insn_value >> ((word_offset + start + 1) - length);
 452       else
 453         value = insn_value >> (total_length - ( word_offset + start + length));
 454     }
 455
 456 #if ! CGEN_INT_INSN_P
 457
 458   else
 459     {
 460       unsigned char *bufp = ex_info->insn_bytes + word_offset / 8;
 461
 462       if (word_length > 32)
 463         abort ();
 464
 465       if (fill_cache (cd, ex_info, word_offset / 8, word_length / 8, pc) == 0)
 466         return 0;
 467
 468       value = extract_1 (cd, ex_info, start, length, word_length, bufp, pc);
 469     }
 470
 471 #endif /* ! CGEN_INT_INSN_P */
 472
 473   /* Written this way to avoid undefined behaviour.  */
 474   mask = (((1L << (length - 1)) - 1) << 1) | 1;
 475
 476   value &= mask;
 477   /* sign extend? */
 478   if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED)
 479       && (value & (1L << (length - 1))))
 480     value |= ~mask;
 481
 482   *valuep = value;
 483
 484   return 1;
 485 }
 486
 487 /* Default insn extractor.
 488
 489    INSN_VALUE is the first base_insn_bitsize bits, translated to host order.
 490    The extracted fields are stored in FIELDS.
 491    EX_INFO is used to handle reading variable length insns.
 492    Return the length of the insn in bits, or 0 if no match,
 493    or -1 if an error occurs fetching data (memory_error_func will have
 494    been called).  */
 495
 496 static int
 497 extract_insn_normal (cd, insn, ex_info, insn_value, fields, pc)
 498      CGEN_CPU_DESC cd;
 499      const CGEN_INSN *insn;
 500      CGEN_EXTRACT_INFO *ex_info;
 501      CGEN_INSN_INT insn_value;
 502      CGEN_FIELDS *fields;
 503      bfd_vma pc;
 504 {
 505   const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
 506   const CGEN_SYNTAX_CHAR_TYPE *syn;
 507
 508   CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);
 509
 510   CGEN_INIT_EXTRACT (cd);
 511
 512   for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
 513     {
 514       int length;
 515
 516       if (CGEN_SYNTAX_CHAR_P (*syn))
 517         continue;
 518
 519       length = (* cd->extract_operand) (cd, CGEN_SYNTAX_FIELD (*syn),
 520                                         ex_info, insn_value, fields, pc);
 521       if (length <= 0)
 522         return length;
 523     }
 524
 525   /* We recognized and successfully extracted this insn.  */
 526   return CGEN_INSN_BITSIZE (insn);
 527 }
 528 \f
 529 /* machine generated code added here */