bfd/xtensa-isa.c

   1 /* Configurable Xtensa ISA support.
   2    Copyright 2003 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <sys/types.h>
  23 #include <string.h>
  24
  25 #include "xtensa-isa.h"
  26 #include "xtensa-isa-internal.h"
  27
  28 xtensa_isa xtensa_default_isa = NULL;
  29
  30 static int
  31 opname_lookup_compare (const void *v1, const void *v2)
  32 {
  33   opname_lookup_entry *e1 = (opname_lookup_entry *)v1;
  34   opname_lookup_entry *e2 = (opname_lookup_entry *)v2;
  35
  36   return strcmp (e1->key, e2->key);
  37 }
  38
  39
  40 xtensa_isa
  41 xtensa_isa_init (void)
  42 {
  43   xtensa_isa isa;
  44   int mod;
  45
  46   isa = xtensa_load_isa (0);
  47   if (isa == 0)
  48     {
  49       fprintf (stderr, "Failed to initialize Xtensa base ISA module\n");
  50       return NULL;
  51     }
  52
  53   for (mod = 1; xtensa_isa_modules[mod].get_num_opcodes_fn; mod++)
  54     {
  55       if (!xtensa_extend_isa (isa, mod))
  56         {
  57           fprintf (stderr, "Failed to initialize Xtensa TIE ISA module\n");
  58           return NULL;
  59         }
  60     }
  61
  62   return isa;
  63 }
  64
  65 /* ISA information.  */
  66
  67 static int
  68 xtensa_check_isa_config (xtensa_isa_internal *isa,
  69                          struct config_struct *config_table)
  70 {
  71   int i, j;
  72
  73   if (!config_table)
  74     {
  75       fprintf (stderr, "Error: Empty configuration table in ISA DLL\n");
  76       return 0;
  77     }
  78
  79   /* For the first module, save a pointer to the table and record the
  80      specified endianness and availability of the density option.  */
  81
  82   if (isa->num_modules == 0)
  83     {
  84       int found_memory_order = 0;
  85
  86       isa->config = config_table;
  87       isa->has_density = 1;  /* Default to have density option.  */
  88
  89       for (i = 0; config_table[i].param_name; i++)
  90         {
  91           if (!strcmp (config_table[i].param_name, "IsaMemoryOrder"))
  92             {
  93               isa->is_big_endian =
  94                 (strcmp (config_table[i].param_value, "BigEndian") == 0);
  95               found_memory_order = 1;
  96             }
  97           if (!strcmp (config_table[i].param_name, "IsaUseDensityInstruction"))
  98             {
  99               isa->has_density = atoi (config_table[i].param_value);
 100             }
 101         }
 102       if (!found_memory_order)
 103         {
 104           fprintf (stderr, "Error: \"IsaMemoryOrder\" missing from "
 105                    "configuration table in ISA DLL\n");
 106           return 0;
 107         }
 108
 109       return 1;
 110     }
 111
 112   /* For subsequent modules, check that the parameters match.  Note: This
 113      code is sufficient to handle the current model where there are never
 114      more than 2 modules; we might at some point want to handle cases where
 115      module N > 0 specifies some parameters not included in the base table,
 116      and we would then add those to isa->config so that subsequent modules
 117      would check against them. */
 118
 119   for (i = 0; config_table[i].param_name; i++)
 120     {
 121       for (j = 0; isa->config[j].param_name; j++)
 122         {
 123           if (!strcmp (config_table[i].param_name, isa->config[j].param_name))
 124             {
 125               int mismatch;
 126               if (!strcmp (config_table[i].param_name, "IsaCoprocessorCount"))
 127                 {
 128                   /* Only require the coprocessor count to be <= the base.  */
 129                   int tiecnt = atoi (config_table[i].param_value);
 130                   int basecnt = atoi (isa->config[j].param_value);
 131                   mismatch = (tiecnt > basecnt);
 132                 }
 133               else
 134                 mismatch = strcmp (config_table[i].param_value,
 135                                    isa->config[j].param_value);
 136               if (mismatch)
 137                 {
 138 #define MISMATCH_MESSAGE \
 139 "Error: Configuration mismatch in the \"%s\" parameter:\n\
 140 the configuration used when the TIE file was compiled had a value of\n\
 141 \"%s\", while the current configuration has a value of\n\
 142 \"%s\". Please rerun the TIE compiler with a matching\n\
 143 configuration.\n"
 144                   fprintf (stderr, MISMATCH_MESSAGE,
 145                            config_table[i].param_name,
 146                            config_table[i].param_value,
 147                            isa->config[j].param_value);
 148                   return 0;
 149                 }
 150               break;
 151             }
 152         }
 153     }
 154
 155   return 1;
 156 }
 157
 158
 159 static int
 160 xtensa_add_isa (xtensa_isa_internal *isa, libisa_module_specifier libisa)
 161 {
 162   const int (*get_num_opcodes_fn) (void);
 163   struct config_struct *(*get_config_table_fn) (void);
 164   xtensa_opcode_internal **(*get_opcodes_fn) (void);
 165   int (*decode_insn_fn) (const xtensa_insnbuf);
 166   xtensa_opcode_internal **opcodes;
 167   int opc, insn_size, prev_num_opcodes, new_num_opcodes, this_module;
 168
 169   get_num_opcodes_fn = xtensa_isa_modules[libisa].get_num_opcodes_fn;
 170   get_opcodes_fn = xtensa_isa_modules[libisa].get_opcodes_fn;
 171   decode_insn_fn = xtensa_isa_modules[libisa].decode_insn_fn;
 172   get_config_table_fn = xtensa_isa_modules[libisa].get_config_table_fn;
 173
 174   if (!get_num_opcodes_fn || !get_opcodes_fn || !decode_insn_fn
 175       || (!get_config_table_fn && isa->num_modules == 0))
 176     return 0;
 177
 178   if (get_config_table_fn
 179       && !xtensa_check_isa_config (isa, get_config_table_fn ()))
 180     return 0;
 181
 182   prev_num_opcodes = isa->num_opcodes;
 183   new_num_opcodes = (*get_num_opcodes_fn) ();
 184
 185   isa->num_opcodes += new_num_opcodes;
 186   isa->opcode_table = (xtensa_opcode_internal **)
 187     realloc (isa->opcode_table, isa->num_opcodes *
 188              sizeof (xtensa_opcode_internal *));
 189   isa->opname_lookup_table = (opname_lookup_entry *)
 190     realloc (isa->opname_lookup_table, isa->num_opcodes *
 191              sizeof (opname_lookup_entry));
 192
 193   opcodes = (*get_opcodes_fn) ();
 194
 195   insn_size = isa->insn_size;
 196   for (opc = 0; opc < new_num_opcodes; opc++)
 197     {
 198       xtensa_opcode_internal *intopc = opcodes[opc];
 199       int newopc = prev_num_opcodes + opc;
 200       isa->opcode_table[newopc] = intopc;
 201       isa->opname_lookup_table[newopc].key = intopc->name;
 202       isa->opname_lookup_table[newopc].opcode = newopc;
 203       if (intopc->length > insn_size)
 204         insn_size = intopc->length;
 205     }
 206
 207   isa->insn_size = insn_size;
 208   isa->insnbuf_size = ((isa->insn_size + sizeof (xtensa_insnbuf_word) - 1) /
 209                        sizeof (xtensa_insnbuf_word));
 210
 211   qsort (isa->opname_lookup_table, isa->num_opcodes,
 212          sizeof (opname_lookup_entry), opname_lookup_compare);
 213
 214   /* Check for duplicate opcode names.  */
 215   for (opc = 1; opc < isa->num_opcodes; opc++)
 216     {
 217       if (!opname_lookup_compare (&isa->opname_lookup_table[opc-1],
 218                                   &isa->opname_lookup_table[opc]))
 219         {
 220           fprintf (stderr, "Error: Duplicate TIE opcode \"%s\"\n",
 221                    isa->opname_lookup_table[opc].key);
 222           return 0;
 223         }
 224     }
 225
 226   this_module = isa->num_modules;
 227   isa->num_modules += 1;
 228
 229   isa->module_opcode_base = (int *) realloc (isa->module_opcode_base,
 230                                              isa->num_modules * sizeof (int));
 231   isa->module_decode_fn = (xtensa_insn_decode_fn *)
 232     realloc (isa->module_decode_fn, isa->num_modules *
 233              sizeof (xtensa_insn_decode_fn));
 234
 235   isa->module_opcode_base[this_module] = prev_num_opcodes;
 236   isa->module_decode_fn[this_module] = decode_insn_fn;
 237
 238   xtensa_default_isa = isa;
 239
 240   return 1;     /* Library was successfully added.  */
 241 }
 242
 243
 244 xtensa_isa
 245 xtensa_load_isa (libisa_module_specifier libisa)
 246 {
 247   xtensa_isa_internal *isa;
 248
 249   isa = (xtensa_isa_internal *) malloc (sizeof (xtensa_isa_internal));
 250   memset (isa, 0, sizeof (xtensa_isa_internal));
 251   if (!xtensa_add_isa (isa, libisa))
 252     {
 253       xtensa_isa_free (isa);
 254       return NULL;
 255     }
 256   return (xtensa_isa) isa;
 257 }
 258
 259
 260 int
 261 xtensa_extend_isa (xtensa_isa isa, libisa_module_specifier libisa)
 262 {
 263   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 264   return xtensa_add_isa (intisa, libisa);
 265 }
 266
 267
 268 void
 269 xtensa_isa_free (xtensa_isa isa)
 270 {
 271   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 272   if (intisa->opcode_table)
 273     free (intisa->opcode_table);
 274   if (intisa->opname_lookup_table)
 275     free (intisa->opname_lookup_table);
 276   if (intisa->module_opcode_base)
 277     free (intisa->module_opcode_base);
 278   if (intisa->module_decode_fn)
 279     free (intisa->module_decode_fn);
 280   free (intisa);
 281 }
 282
 283
 284 int
 285 xtensa_insn_maxlength (xtensa_isa isa)
 286 {
 287   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 288   return intisa->insn_size;
 289 }
 290
 291
 292 int
 293 xtensa_insnbuf_size (xtensa_isa isa)
 294 {
 295   xtensa_isa_internal *intisa = (xtensa_isa_internal *)isa;
 296   return intisa->insnbuf_size;
 297 }
 298
 299
 300 int
 301 xtensa_num_opcodes (xtensa_isa isa)
 302 {
 303   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 304   return intisa->num_opcodes;
 305 }
 306
 307
 308 xtensa_opcode
 309 xtensa_opcode_lookup (xtensa_isa isa, const char *opname)
 310 {
 311   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 312   opname_lookup_entry entry, *result;
 313
 314   entry.key = opname;
 315   result = bsearch (&entry, intisa->opname_lookup_table, intisa->num_opcodes,
 316                     sizeof (opname_lookup_entry), opname_lookup_compare);
 317   if (!result) return XTENSA_UNDEFINED;
 318   return result->opcode;
 319 }
 320
 321
 322 xtensa_opcode
 323 xtensa_decode_insn (xtensa_isa isa, const xtensa_insnbuf insn)
 324 {
 325   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 326   int n, opc;
 327   for (n = 0; n < intisa->num_modules; n++) {
 328     opc = (intisa->module_decode_fn[n]) (insn);
 329     if (opc != XTENSA_UNDEFINED)
 330       return intisa->module_opcode_base[n] + opc;
 331   }
 332   return XTENSA_UNDEFINED;
 333 }
 334
 335
 336 /* Opcode information.  */
 337
 338 void
 339 xtensa_encode_insn (xtensa_isa isa, xtensa_opcode opc, xtensa_insnbuf insn)
 340 {
 341   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 342   xtensa_insnbuf template = intisa->opcode_table[opc]->template();
 343   int len = intisa->opcode_table[opc]->length;
 344   int n;
 345
 346   /* Convert length to 32-bit words.  */
 347   len = (len + 3) / 4;
 348
 349   /* Copy the template.  */
 350   for (n = 0; n < len; n++)
 351     insn[n] = template[n];
 352
 353   /* Fill any unused buffer space with zeros.  */
 354   for ( ; n < intisa->insnbuf_size; n++)
 355     insn[n] = 0;
 356 }
 357
 358
 359 const char *
 360 xtensa_opcode_name (xtensa_isa isa, xtensa_opcode opc)
 361 {
 362   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 363   return intisa->opcode_table[opc]->name;
 364 }
 365
 366
 367 int
 368 xtensa_insn_length (xtensa_isa isa, xtensa_opcode opc)
 369 {
 370   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 371   return intisa->opcode_table[opc]->length;
 372 }
 373
 374
 375 int
 376 xtensa_insn_length_from_first_byte (xtensa_isa isa, char first_byte)
 377 {
 378   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 379   int is_density = (first_byte & (intisa->is_big_endian ? 0x80 : 0x08)) != 0;
 380   return (intisa->has_density && is_density ? 2 : 3);
 381 }
 382
 383
 384 int
 385 xtensa_num_operands (xtensa_isa isa, xtensa_opcode opc)
 386 {
 387   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 388   return intisa->opcode_table[opc]->iclass->num_operands;
 389 }
 390
 391
 392 xtensa_operand
 393 xtensa_get_operand (xtensa_isa isa, xtensa_opcode opc, int opnd)
 394 {
 395   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 396   xtensa_iclass_internal *iclass = intisa->opcode_table[opc]->iclass;
 397   if (opnd >= iclass->num_operands)
 398     return NULL;
 399   return (xtensa_operand) iclass->operands[opnd];
 400 }
 401
 402
 403 /* Operand information.  */
 404
 405 char *
 406 xtensa_operand_kind (xtensa_operand opnd)
 407 {
 408   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 409   return intop->operand_kind;
 410 }
 411
 412
 413 char
 414 xtensa_operand_inout (xtensa_operand opnd)
 415 {
 416   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 417   return intop->inout;
 418 }
 419
 420
 421 uint32
 422 xtensa_operand_get_field (xtensa_operand opnd, const xtensa_insnbuf insn)
 423 {
 424   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 425   return (*intop->get_field) (insn);
 426 }
 427
 428
 429 void
 430 xtensa_operand_set_field (xtensa_operand opnd, xtensa_insnbuf insn, uint32 val)
 431 {
 432   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 433   return (*intop->set_field) (insn, val);
 434 }
 435
 436
 437 xtensa_encode_result
 438 xtensa_operand_encode (xtensa_operand opnd, uint32 *valp)
 439 {
 440   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 441   return (*intop->encode) (valp);
 442 }
 443
 444
 445 uint32
 446 xtensa_operand_decode (xtensa_operand opnd, uint32 val)
 447 {
 448   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 449   return (*intop->decode) (val);
 450 }
 451
 452
 453 int
 454 xtensa_operand_isPCRelative (xtensa_operand opnd)
 455 {
 456   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 457   return intop->isPCRelative;
 458 }
 459
 460
 461 uint32
 462 xtensa_operand_do_reloc (xtensa_operand opnd, uint32 addr, uint32 pc)
 463 {
 464   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 465   if (!intop->isPCRelative)
 466     return addr;
 467   return (*intop->do_reloc) (addr, pc);
 468 }
 469
 470
 471 uint32
 472 xtensa_operand_undo_reloc (xtensa_operand opnd, uint32 offset, uint32 pc)
 473 {
 474   xtensa_operand_internal *intop = (xtensa_operand_internal *) opnd;
 475   if (!intop->isPCRelative)
 476     return offset;
 477   return (*intop->undo_reloc) (offset, pc);
 478 }
 479
 480
 481 /* Instruction buffers.  */
 482
 483 xtensa_insnbuf
 484 xtensa_insnbuf_alloc (xtensa_isa isa)
 485 {
 486   return (xtensa_insnbuf) malloc (xtensa_insnbuf_size (isa) *
 487                                   sizeof (xtensa_insnbuf_word));
 488 }
 489
 490
 491 void
 492 xtensa_insnbuf_free (xtensa_insnbuf buf)
 493 {
 494   free( buf );
 495 }
 496
 497
 498 /* Given <byte_index>, the index of a byte in a xtensa_insnbuf, our
 499    internal representation of a xtensa instruction word, return the index of
 500    its word and the bit index of its low order byte in the xtensa_insnbuf.  */
 501
 502 static inline int
 503 byte_to_word_index (int byte_index)
 504 {
 505   return byte_index / sizeof (xtensa_insnbuf_word);
 506 }
 507
 508
 509 static inline int
 510 byte_to_bit_index (int byte_index)
 511 {
 512   return (byte_index & 0x3) * 8;
 513 }
 514
 515
 516 /* Copy an instruction in the 32 bit words pointed at by <insn> to characters
 517    pointed at by <cp>.  This is more complicated than you might think because
 518    we want 16 bit instructions in bytes 2,3 for big endian. This function
 519    allows us to specify which byte in <insn> to start with and which way to
 520    increment, allowing trivial implementation for both big and little endian.
 521    And it seems to make pretty good code for both.  */
 522
 523 void
 524 xtensa_insnbuf_to_chars (xtensa_isa isa, const xtensa_insnbuf insn, char *cp)
 525 {
 526   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 527   int insn_size = xtensa_insn_maxlength (intisa);
 528   int fence_post, start, increment, i, byte_count;
 529   xtensa_opcode opc;
 530
 531   if (intisa->is_big_endian)
 532     {
 533       start = insn_size - 1;
 534       increment = -1;
 535     }
 536   else
 537     {
 538       start = 0;
 539       increment = 1;
 540     }
 541
 542   /* Find the opcode; do nothing if the buffer does not contain a valid
 543      instruction since we need to know how many bytes to copy.  */
 544   opc = xtensa_decode_insn (isa, insn);
 545   if (opc == XTENSA_UNDEFINED)
 546     return;
 547
 548   byte_count = xtensa_insn_length (isa, opc);
 549   fence_post = start + (byte_count * increment);
 550
 551   for (i = start; i != fence_post; i += increment, ++cp)
 552     {
 553       int word_inx = byte_to_word_index (i);
 554       int bit_inx = byte_to_bit_index (i);
 555
 556       *cp = (insn[word_inx] >> bit_inx) & 0xff;
 557     }
 558 }
 559
 560 /* Inward conversion from byte stream to xtensa_insnbuf.  See
 561    xtensa_insnbuf_to_chars for a discussion of why this is
 562    complicated by endianness.  */
 563
 564 void
 565 xtensa_insnbuf_from_chars (xtensa_isa isa, xtensa_insnbuf insn, const char* cp)
 566 {
 567   xtensa_isa_internal *intisa = (xtensa_isa_internal *) isa;
 568   int insn_size = xtensa_insn_maxlength (intisa);
 569   int fence_post, start, increment, i;
 570
 571   if (intisa->is_big_endian)
 572     {
 573       start = insn_size - 1;
 574       increment = -1;
 575     }
 576   else
 577     {
 578       start = 0;
 579       increment = 1;
 580     }
 581
 582   fence_post = start + (insn_size * increment);
 583   memset (insn, 0, xtensa_insnbuf_size (isa) * sizeof (xtensa_insnbuf_word));
 584
 585   for ( i = start; i != fence_post; i += increment, ++cp )
 586     {
 587       int word_inx = byte_to_word_index (i);
 588       int bit_inx = byte_to_bit_index (i);
 589
 590       insn[word_inx] |= (*cp & 0xff) << bit_inx;
 591     }
 592 }
 593