bfd/archures.c

   1 /* BFD library support routines for architectures.
   2    Copyright (C) 1990-1991 Free Software Foundation, Inc.
   3    Hacked by John Gilmore and Steve Chamberlain of Cygnus Support.
   4
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  21
  22 /*
  23
  24 SECTION
  25         Architectures
  26
  27         BFD's idea of an architecture is implimented in
  28         <<archures.c>>. BFD keeps one atom in a BFD describing the
  29         architecture of the data attached to the BFD;  a pointer to a
  30         <<bfd_arch_info_type>>.
  31
  32         Pointers to structures can be requested independently of a bfd
  33         so that an architecture's information can be interrogated
  34         without access to an open bfd.
  35
  36         The arch information is provided by each architecture package.
  37         The set of default architectures is selected by the #define
  38         <<SELECT_ARCHITECTURES>>.  This is normally set up in the
  39         <<config\/h\->> file of your choice.  If the name is not
  40         defined, then all the architectures supported are included.
  41
  42         When BFD starts up, all the architectures are called with an
  43         initialize method.  It is up to the architecture back end to
  44         insert as many items into the list of arches as it wants to,
  45         generally this would be one for each machine and one for the
  46         default case (an item with a machine field of 0).
  47 */
  48
  49 /*
  50
  51 SUBSECTION
  52         bfd_architecture
  53
  54 DESCRIPTION
  55         This enum gives the object file's CPU architecture, in a
  56         global sense. E.g. what processor family does it belong to?
  57         There is another field, which indicates what processor within
  58         the family is in use.  The machine gives a number which
  59         distingushes different versions of the architecture,
  60         containing for example 2 and 3 for Intel i960 KA and i960 KB,
  61         and 68020 and 68030 for Motorola 68020 and 68030.
  62
  63 .enum bfd_architecture
  64 .{
  65 .  bfd_arch_unknown,   {* File arch not known *}
  66 .  bfd_arch_obscure,   {* Arch known, not one of these *}
  67 .  bfd_arch_m68k,      {* Motorola 68xxx *}
  68 .  bfd_arch_vax,       {* DEC Vax *}
  69 .  bfd_arch_i960,      {* Intel 960 *}
  70 .    {* The order of the following is important.
  71 .       lower number indicates a machine type that
  72 .       only accepts a subset of the instructions
  73 .       available to machines with higher numbers.
  74 .       The exception is the "ca", which is
  75 .       incompatible with all other machines except
  76 .       "core". *}
  77 .
  78 .#define bfd_mach_i960_core      1
  79 .#define bfd_mach_i960_ka_sa     2
  80 .#define bfd_mach_i960_kb_sb     3
  81 .#define bfd_mach_i960_mc        4
  82 .#define bfd_mach_i960_xa        5
  83 .#define bfd_mach_i960_ca        6
  84 .
  85 .  bfd_arch_a29k,      {* AMD 29000 *}
  86 .  bfd_arch_sparc,     {* SPARC *}
  87 .  bfd_arch_mips,      {* MIPS Rxxxx *}
  88 .  bfd_arch_i386,      {* Intel 386 *}
  89 .  bfd_arch_ns32k,     {* National Semiconductor 32xxx *}
  90 .  bfd_arch_tahoe,     {* CCI/Harris Tahoe *}
  91 .  bfd_arch_i860,      {* Intel 860 *}
  92 .  bfd_arch_romp,      {* IBM ROMP PC/RT *}
  93 .  bfd_arch_alliant,   {* Alliant *}
  94 .  bfd_arch_convex,    {* Convex *}
  95 .  bfd_arch_m88k,      {* Motorola 88xxx *}
  96 .  bfd_arch_pyramid,   {* Pyramid Technology *}
  97 .  bfd_arch_h8300,     {* Hitachi H8/300 *}
  98 .  bfd_arch_rs6000,    {* IBM RS/6000 *}
  99 .  bfd_arch_hppa,      {* HP PA RISC *}
 100 .  bfd_arch_last
 101 .  };
 102
 103
 104 */
 105
 106
 107
 108 /* $Id$ */
 109
 110 #include "bfd.h"
 111 #include "sysdep.h"
 112 #include "libbfd.h"
 113
 114 /*
 115
 116 SUBSECTION
 117         bfd_arch_info
 118
 119 DESCRIPTION
 120         This structure contains information on architectures for use
 121         within BFD.
 122
 123 .typedef int bfd_reloc_code_type;
 124 .
 125 .typedef struct bfd_arch_info
 126 .{
 127 .  int bits_per_word;
 128 .  int bits_per_address;
 129 .  int bits_per_byte;
 130 .  enum bfd_architecture arch;
 131 .  long mach;
 132 .  char *arch_name;
 133 .  CONST  char *printable_name;
 134 .  unsigned int section_align_power;
 135 . {* true if this is the default machine for the architecture *}
 136 .  boolean the_default;
 137 .  CONST struct bfd_arch_info * EXFUN((*compatible),
 138 .       (CONST struct bfd_arch_info *a,
 139 .        CONST struct bfd_arch_info *b));
 140 .
 141 .  boolean EXFUN((*scan),(CONST struct bfd_arch_info *,CONST char *));
 142 .  unsigned int EXFUN((*disassemble),(bfd_vma addr, CONST char *data,
 143 .                                    PTR stream));
 144 .
 145 .  unsigned int segment_size;
 146 .  unsigned int page_size;
 147 .
 148 .  struct bfd_arch_info *next;
 149 .} bfd_arch_info_type;
 150 */
 151
 152 bfd_arch_info_type   *bfd_arch_info_list;
 153
 154
 155 /*
 156 FUNCTION
 157         bfd_printable_name
 158
 159 SYNOPSIS
 160         CONST char *bfd_printable_name(bfd *abfd);
 161
 162 DESCRIPTION
 163         Return a printable string representing the architecture and machine
 164         from the pointer to the arch info structure
 165
 166 */
 167
 168 CONST char *
 169 DEFUN(bfd_printable_name, (abfd),
 170       bfd *abfd)
 171 {
 172   return abfd->arch_info->printable_name;
 173 }
 174
 175
 176
 177 /*
 178 FUNCTION
 179         bfd_scan_arch
 180
 181 SYNOPSIS
 182         bfd_arch_info_type *bfd_scan_arch(CONST char *);
 183
 184 DESCRIPTION
 185         This routine is provided with a string and tries to work out
 186         if bfd supports any cpu which could be described with the name
 187         provided.  The routine returns a pointer to an arch_info
 188         structure if a machine is found, otherwise NULL.
 189
 190 */
 191
 192 bfd_arch_info_type *
 193 DEFUN(bfd_scan_arch,(string),
 194       CONST char *string)
 195 {
 196   struct bfd_arch_info *ap;
 197
 198   /* Look through all the installed architectures */
 199   for (ap = bfd_arch_info_list;
 200        ap != (bfd_arch_info_type *)NULL;
 201        ap = ap->next) {
 202
 203     if (ap->scan(ap, string))
 204       return ap;
 205   }
 206   return (bfd_arch_info_type *)NULL;
 207 }
 208
 209
 210
 211 /*
 212 FUNCTION
 213         bfd_arch_get_compatible
 214
 215 SYNOPSIS
 216         CONST bfd_arch_info_type *bfd_arch_get_compatible(
 217                 CONST bfd *abfd,
 218                 CONST bfd *bbfd);
 219
 220 DESCRIPTION
 221         This routine is used to determine whether two BFDs'
 222         architectures and achine types are compatible.  It calculates
 223         the lowest common denominator between the two architectures
 224         and machine types implied by the BFDs and returns a pointer to
 225         an arch_info structure describing the compatible machine.
 226 */
 227
 228 CONST bfd_arch_info_type *
 229 DEFUN(bfd_arch_get_compatible,(abfd, bbfd),
 230 CONST    bfd *abfd AND
 231 CONST    bfd *bbfd)
 232
 233 {
 234   return  abfd->arch_info->compatible(abfd->arch_info,bbfd->arch_info);
 235 }
 236
 237
 238 /*
 239 INTERNAL_DEFINITION
 240         bfd_default_arch_struct
 241
 242 DESCRIPTION
 243         The <<bfd_default_arch_struct>> is an item of
 244         <<bfd_arch_info_type>> which has been initialized to a fairly
 245         generic state.  A BFD starts life by pointing to this
 246         structure, until the correct back end has determined the real
 247         architecture of the file.
 248
 249 .extern bfd_arch_info_type bfd_default_arch_struct;
 250
 251 */
 252
 253 bfd_arch_info_type bfd_default_arch_struct =
 254 {
 255     32,32,8,bfd_arch_unknown,0,"unknown","unknown",1,true,
 256     bfd_default_compatible,
 257     bfd_default_scan,
 258     0,
 259 };
 260
 261 /*
 262 FUNCTION
 263         bfd_set_arch_info
 264
 265 SYNOPSIS
 266         void bfd_set_arch_info(bfd *, bfd_arch_info_type *);
 267
 268 */
 269
 270 void DEFUN(bfd_set_arch_info,(abfd, arg),
 271 bfd *abfd AND
 272 bfd_arch_info_type *arg)
 273 {
 274   abfd->arch_info = arg;
 275 }
 276
 277 /*
 278 INTERNAL_FUNCTION
 279         bfd_default_set_arch_mach
 280
 281 SYNOPSIS
 282         boolean bfd_default_set_arch_mach(bfd *abfd,
 283                 enum bfd_architecture arch,
 284                 unsigned long mach);
 285
 286 DESCRIPTION
 287         Set the architecture and machine type in a bfd. This finds the
 288         correct pointer to structure and inserts it into the arch_info
 289         pointer.
 290 */
 291
 292 boolean DEFUN(bfd_default_set_arch_mach,(abfd, arch, mach),
 293               bfd *abfd AND
 294               enum bfd_architecture arch AND
 295               unsigned    long mach)
 296 {
 297   static struct bfd_arch_info *old_ptr = &bfd_default_arch_struct;
 298   boolean found = false;
 299   /* run through the table to find the one we want, we keep a little
 300      cache to speed things up */
 301   if (old_ptr == 0 || arch != old_ptr->arch || mach != old_ptr->mach) {
 302     bfd_arch_info_type *ptr;
 303     old_ptr = (bfd_arch_info_type *)NULL;
 304     for (ptr = bfd_arch_info_list;
 305          ptr != (bfd_arch_info_type *)NULL;
 306          ptr= ptr->next) {
 307       if (ptr->arch == arch &&
 308           ((ptr->mach == mach) || (ptr->the_default && mach == 0))) {
 309         old_ptr = ptr;
 310         found = true;
 311         break;
 312       }
 313     }
 314     if (found==false) {
 315       /*looked for it and it wasn't there, so put in the default */
 316       old_ptr = &bfd_default_arch_struct;
 317
 318     }
 319   }
 320   else {
 321     /* it was in the cache */
 322     found = true;
 323   }
 324
 325   abfd->arch_info = old_ptr;
 326
 327   return found;
 328 }
 329
 330
 331
 332
 333
 334 /*
 335 FUNCTION
 336         bfd_get_arch
 337
 338 SYNOPSIS
 339         enum bfd_architecture bfd_get_arch(bfd *abfd);
 340
 341 DESCRIPTION
 342         Returns the enumerated type which describes the supplied bfd's
 343         architecture
 344
 345 */
 346
 347 enum bfd_architecture DEFUN(bfd_get_arch, (abfd), bfd *abfd)
 348 {
 349     return abfd->arch_info->arch;
 350 }
 351
 352 /*
 353 FUNCTION
 354         bfd_get_mach
 355
 356 SYNOPSIS
 357         unsigned long bfd_get_mach(bfd *abfd);
 358
 359 DESCRIPTION
 360         Returns the long type which describes the supplied bfd's
 361         machine
 362 */
 363
 364 unsigned long
 365 DEFUN(bfd_get_mach, (abfd), bfd *abfd)
 366 {
 367     return abfd->arch_info->mach;
 368 }
 369
 370 /*
 371 FUNCTION
 372         bfd_arch_bits_per_byte
 373
 374 SYNOPSIS
 375         unsigned int bfd_arch_bits_per_byte(bfd *abfd);
 376
 377 DESCRIPTION
 378         Returns the number of bits in one of the architectures bytes
 379
 380 */
 381
 382 unsigned int DEFUN(bfd_arch_bits_per_byte, (abfd), bfd *abfd)
 383   {
 384     return abfd->arch_info->bits_per_byte;
 385   }
 386
 387 /*
 388 FUNCTION
 389         bfd_arch_bits_per_address
 390
 391 SYNOPSIS
 392         unsigned int bfd_arch_bits_per_address(bfd *abfd);
 393
 394 DESCRIPTION
 395         Returns the number of bits in one of the architectures addresses
 396 */
 397
 398 unsigned int DEFUN(bfd_arch_bits_per_address, (abfd), bfd *abfd)
 399   {
 400     return abfd->arch_info->bits_per_address;
 401   }
 402
 403
 404
 405 extern void EXFUN(bfd_h8300_arch,(void));
 406 extern void EXFUN(bfd_i960_arch,(void));
 407 extern void EXFUN(bfd_empty_arch,(void));
 408 extern void EXFUN(bfd_sparc_arch,(void));
 409 extern void EXFUN(bfd_m88k_arch,(void));
 410 extern void EXFUN(bfd_m68k_arch,(void));
 411 extern void EXFUN(bfd_vax_arch,(void));
 412 extern void EXFUN(bfd_a29k_arch,(void));
 413 extern void EXFUN(bfd_mips_arch,(void));
 414 extern void EXFUN(bfd_i386_arch,(void));
 415 extern void EXFUN(bfd_rs6000_arch,(void));
 416 extern void EXFUN(bfd_hppa_arch,(void));
 417
 418
 419
 420 static void EXFUN((*archures_init_table[]),()) =
 421 {
 422 #ifdef SELECT_ARCHITECTURES
 423   SELECT_ARCHITECTURES,
 424 #else
 425   bfd_sparc_arch,
 426   bfd_a29k_arch,
 427   bfd_mips_arch,
 428   bfd_h8300_arch,
 429   bfd_i386_arch,
 430   bfd_m88k_arch,
 431   bfd_i960_arch,
 432   bfd_m68k_arch,
 433   bfd_vax_arch,
 434   bfd_rs6000_arch,
 435   bfd_hppa_arch,
 436 #endif
 437   0
 438   };
 439
 440
 441
 442 /*
 443 INTERNAL_FUNCTION
 444         bfd_arch_init
 445
 446 SYNOPSIS
 447         void  bfd_arch_init(void);
 448
 449 DESCRIPTION
 450         This routine initializes the architecture dispatch table by
 451         calling all installed architecture packages and getting them
 452         to poke around.
 453 */
 454
 455 void
 456 DEFUN_VOID(bfd_arch_init)
 457 {
 458     void EXFUN((**ptable),());
 459     for (ptable = archures_init_table;
 460          *ptable ;
 461          ptable++)
 462     {
 463         (*ptable)();
 464     }
 465 }
 466
 467
 468 /*
 469 INTERNAL_FUNCTION
 470         bfd_arch_linkin
 471
 472 SYNOPSIS
 473         void bfd_arch_linkin(bfd_arch_info_type *);
 474
 475 DESCRIPTION
 476         Link the provided arch info structure into the list
 477 */
 478
 479 void DEFUN(bfd_arch_linkin,(ptr),
 480            bfd_arch_info_type *ptr)
 481 {
 482   ptr->next = bfd_arch_info_list;
 483   bfd_arch_info_list = ptr;
 484 }
 485
 486
 487 /*
 488 INTERNAL_FUNCTION
 489         bfd_default_compatible
 490
 491 SYNOPSIS
 492         CONST bfd_arch_info_type *bfd_default_compatible
 493         (CONST bfd_arch_info_type *a,
 494         CONST bfd_arch_info_type *b);
 495
 496 DESCRIPTION
 497         The default function for testing for compatibility.
 498 */
 499
 500 CONST bfd_arch_info_type *
 501 DEFUN(bfd_default_compatible,(a,b),
 502       CONST bfd_arch_info_type *a AND
 503       CONST bfd_arch_info_type *b)
 504 {
 505   if(a->arch != b->arch) return NULL;
 506
 507   if (a->mach > b->mach) {
 508     return a;
 509   }
 510   if (b->mach > a->mach) {
 511     return b;
 512   }
 513   return a;
 514 }
 515
 516
 517 /*
 518 INTERNAL_FUNCTION
 519         bfd_default_scan
 520
 521 SYNOPSIS
 522         boolean bfd_default_scan(CONST struct bfd_arch_info *, CONST char *);
 523
 524 DESCRIPTION
 525         The default function for working out whether this is an
 526         architecture hit and a machine hit.
 527 */
 528
 529 boolean
 530 DEFUN(bfd_default_scan,(info, string),
 531 CONST struct bfd_arch_info *info AND
 532 CONST char *string)
 533 {
 534     CONST  char *ptr_src;
 535     CONST   char *ptr_tst;
 536     unsigned long number;
 537     enum bfd_architecture arch;
 538     /* First test for an exact match */
 539     if (strcmp(string, info->printable_name) == 0) return true;
 540
 541     /* See how much of the supplied string matches with the
 542        architecture, eg the string m68k:68020 would match the 68k entry
 543        up to the :, then we get left with the machine number */
 544
 545     for (ptr_src = string,
 546          ptr_tst = info->arch_name;
 547          *ptr_src && *ptr_tst;
 548          ptr_src++,
 549          ptr_tst++)
 550     {
 551         if (*ptr_src != *ptr_tst) break;
 552     }
 553
 554     /* Chewed up as much of the architecture as will match, skip any
 555        colons */
 556     if (*ptr_src == ':') ptr_src++;
 557
 558     if (*ptr_src == 0) {
 559             /* nothing more, then only keep this one if it is the default
 560                machine for this architecture */
 561             return info->the_default;
 562         }
 563     number = 0;
 564     while (isdigit(*ptr_src)) {
 565             number = number * 10 + *ptr_src  - '0';
 566             ptr_src++;
 567         }
 568
 569     switch (number)
 570     {
 571       case 68010:
 572       case 68020:
 573       case 68030:
 574       case 68040:
 575       case 68332:
 576       case 68050:
 577       case 68000:
 578         arch = bfd_arch_m68k;
 579         break;
 580       case 386:
 581       case 80386:
 582       case 486:
 583         arch = bfd_arch_i386;
 584         break;
 585       case 29000:
 586         arch = bfd_arch_a29k;
 587         break;
 588
 589       case 32016:
 590       case 32032:
 591       case 32132:
 592       case 32232:
 593       case 32332:
 594       case 32432:
 595       case 32532:
 596       case 32000:
 597         arch = bfd_arch_ns32k;
 598         break;
 599
 600       case 860:
 601       case 80860:
 602         arch = bfd_arch_i860;
 603         break;
 604
 605       case 6000:
 606         arch = bfd_arch_rs6000;
 607         break;
 608
 609       default:
 610         return false;
 611     }
 612     if (arch != info->arch)
 613      return false;
 614
 615     if (number != info->mach)
 616      return false;
 617
 618     return true;
 619 }
 620
 621
 622
 623
 624 /*
 625 FUNCTION
 626         bfd_get_arch_info
 627
 628
 629 SYNOPSIS
 630         bfd_arch_info_type * bfd_get_arch_info(bfd *);
 631
 632 */
 633
 634 bfd_arch_info_type *
 635 DEFUN(bfd_get_arch_info,(abfd),
 636 bfd *abfd)
 637 {
 638   return  abfd->arch_info;
 639 }
 640
 641
 642 /*
 643 FUNCTION
 644         bfd_lookup_arch
 645
 646 SYNOPSIS
 647         bfd_arch_info_type *bfd_lookup_arch
 648                 (enum bfd_architecture
 649                 arch,
 650                 long machine);
 651
 652 DESCRIPTION
 653         Look for the architecure info struct which matches the
 654         arguments given. A machine of 0 will match the
 655         machine/architecture structure which marks itself as the
 656         default.
 657 */
 658
 659 bfd_arch_info_type *
 660 DEFUN(bfd_lookup_arch,(arch, machine),
 661 enum bfd_architecture arch AND
 662 long machine)
 663 {
 664     bfd_arch_info_type *ap;
 665     bfd_check_init();
 666     for (ap = bfd_arch_info_list;
 667          ap !=  (bfd_arch_info_type *)NULL;
 668          ap = ap->next) {
 669             if (ap->arch == arch &&
 670                 ((ap->mach == machine)
 671                  || (ap->the_default && machine == 0))) {
 672                     return ap;
 673                 }
 674         }
 675     return (bfd_arch_info_type *)NULL;
 676 }
 677
 678
 679
 680 /*
 681 FUNCTION
 682         bfd_printable_arch_mach
 683
 684 SYNOPSIS
 685         CONST char * bfd_printable_arch_mach
 686                 (enum bfd_architecture arch, unsigned long machine);
 687
 688 DESCRIPTION
 689         Return a printable string representing the architecture and
 690         machine type.
 691
 692         NB. The use of this routine is depreciated.
 693 */
 694
 695 CONST char *
 696 DEFUN(bfd_printable_arch_mach,(arch, machine),
 697       enum bfd_architecture arch AND
 698       unsigned long machine)
 699 {
 700     bfd_arch_info_type *ap = bfd_lookup_arch(arch, machine);
 701     if(ap) return ap->printable_name;
 702     return "UNKNOWN!";
 703 }