bfd/bfd.c

   1                            /* -*- C -*- */
   2
   3 /*** bfd -- binary file diddling routines by Gumby Wallace of Cygnus Support.
   4             Every definition in this file should be exported and declared
   5             in bfd.c.  If you don't want it to be user-visible, put it in
   6             libbfd.c!
   7 */
   8
   9 /* Copyright (C) 1990, 1991 Free Software Foundation, Inc.
  10
  11 This file is part of BFD, the Binary File Diddler.
  12
  13 BFD is free software; you can redistribute it and/or modify
  14 it under the terms of the GNU General Public License as published by
  15 the Free Software Foundation; either version 1, or (at your option)
  16 any later version.
  17
  18 BFD is distributed in the hope that it will be useful,
  19 but WITHOUT ANY WARRANTY; without even the implied warranty of
  20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21 GNU General Public License for more details.
  22
  23 You should have received a copy of the GNU General Public License
  24 along with BFD; see the file COPYING.  If not, write to
  25 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  26
  27 /* $Id$ */
  28 #include "sysdep.h"
  29 #include "bfd.h"
  30 #include "libbfd.h"
  31
  32 short _bfd_host_big_endian = 0x0100;
  33         /* Accessing the above as (*(char*)&_bfd_host_big_endian), will
  34          * return 1 if the host is big-endian, 0 otherwise.
  35          * (See HOST_IS_BIG_ENDIAN_P in bfd.h.)
  36          */
  37
  38
  39
  40 \f
  41
  42 /** Error handling
  43     o - Most functions return nonzero on success (check doc for
  44         precise semantics); 0 or NULL on error.
  45     o - Internal errors are documented by the value of bfd_error.
  46         If that is system_call_error then check errno.
  47     o - The easiest way to report this to the user is to use bfd_perror.
  48 */
  49
  50 bfd_ec bfd_error = no_error;
  51
  52 char *bfd_errmsgs[] = {"No error",
  53                        "System call error",
  54                        "Invalid target",
  55                        "File in wrong format",
  56                        "Invalid operation",
  57                        "Memory exhausted",
  58                        "No symbols",
  59                        "No relocation info",
  60                        "No more archived files",
  61                        "Malformed archive",
  62                        "Symbol not found",
  63                        "File format not recognized",
  64                        "File format is ambiguous",
  65                            "Section has no contents",
  66                  "Nonrepresentable section on output",
  67                        "#<Invalid error code>"
  68                        };
  69
  70
  71 static
  72 void
  73 DEFUN(bfd_nonrepresentable_section,(abfd, name),
  74          CONST  bfd * CONST abfd AND
  75          CONST  char * CONST name)
  76 {
  77   printf("bfd error writing file %s, format %s can't represent section %s\n",
  78          abfd->filename,
  79          abfd->xvec->name,
  80          name);
  81   exit(1);
  82 }
  83 bfd_error_vector_type bfd_error_vector =
  84   {
  85   bfd_nonrepresentable_section
  86   };
  87
  88 #if !defined(ANSI_LIBRARIES)
  89 char *
  90 strerror (code)
  91      int code;
  92 {
  93   extern int sys_nerr;
  94   extern char *sys_errlist[];
  95
  96   return (((code < 0) || (code >= sys_nerr)) ? "(unknown error)" :
  97           sys_errlist [code]);
  98 }
  99 #endif /* not ANSI_LIBRARIES */
 100
 101
 102
 103 char *
 104 bfd_errmsg (error_tag)
 105      bfd_ec error_tag;
 106 {
 107         extern int errno;
 108
 109   if (error_tag == system_call_error)
 110     return strerror (errno);
 111
 112   if ((((int)error_tag <(int) no_error) ||
 113        ((int)error_tag > (int)invalid_error_code)))
 114     error_tag = invalid_error_code;/* sanity check */
 115
 116   return bfd_errmsgs [(int)error_tag];
 117 }
 118
 119
 120 void bfd_default_error_trap(error_tag)
 121 bfd_ec error_tag;
 122 {
 123   printf("bfd assert fail (%s)\n", bfd_errmsg(error_tag));
 124 }
 125
 126 void (*bfd_error_trap)() = bfd_default_error_trap;
 127 void (*bfd_error_nonrepresentabltrap)() = bfd_default_error_trap;
 128 void
 129 DEFUN(bfd_perror,(message),
 130       CONST char *message)
 131 {
 132   if (bfd_error == system_call_error)
 133     perror(message);            /* must be system error then... */
 134   else {
 135     if (message == NULL || *message == '\0')
 136       fprintf (stderr, "%s\n", bfd_errmsg (bfd_error));
 137     else
 138       fprintf (stderr, "%s: %s\n", message, bfd_errmsg (bfd_error));
 139   }
 140 }
 141
 142 /* for error messages */
 143 char *
 144 bfd_format_string (format)
 145      bfd_format format;
 146 {
 147   if (((int)format <(int) bfd_unknown) || ((int)format >=(int) bfd_type_end)) return "invalid";
 148
 149   switch (format) {
 150   case bfd_object: return "object"; /* linker/assember/compiler output */
 151   case bfd_archive: return "archive"; /* object archive file */
 152   case bfd_core: return "core"; /* core dump */
 153   default: return "unknown";
 154   }
 155 }
 156 \f
 157 /** Target configurations */
 158
 159 extern bfd_target *target_vector[];
 160
 161 /* Returns a pointer to the transfer vector for the object target
 162    named target_name.  If target_name is NULL, chooses the one in the
 163    environment variable GNUTARGET; if that is null or not defined then
 164    the first entry in the target list is chosen.  Passing in the
 165    string "default" or setting the environment variable to "default"
 166    will cause the first entry in the target list to be returned. */
 167
 168 bfd_target *
 169 DEFUN(bfd_find_target,(target_name),
 170       CONST char *target_name)
 171 {
 172   bfd_target **target;
 173   extern char *getenv ();
 174   CONST char *targname = (target_name ? target_name : getenv ("GNUTARGET"));
 175
 176   /* This is safe; the vector cannot be null */
 177   if (targname == NULL || !strcmp (targname, "default"))
 178     return target_vector[0];
 179
 180   for (target = &target_vector[0]; *target != NULL; target++) {
 181     if (!strcmp (targname, (*target)->name))
 182       return *target;
 183   }
 184
 185   bfd_error = invalid_target;
 186   return NULL;
 187 }
 188
 189 /* Returns a freshly-consed, NULL-terminated vector of the names of all the
 190    valid bfd targets.  Do not modify the names */
 191
 192 char **
 193 bfd_target_list ()
 194 {
 195   int vec_length= 0;
 196   bfd_target **target;
 197   char **name_list, **name_ptr;
 198
 199   for (target = &target_vector[0]; *target != NULL; target++)
 200     vec_length++;
 201
 202   name_ptr = name_list = (char **) zalloc ((vec_length + 1) * sizeof (char **));
 203
 204   if (name_list == NULL) {
 205     bfd_error = no_memory;
 206     return NULL;
 207   }
 208
 209   for (target = &target_vector[0]; *target != NULL; target++)
 210     *(name_ptr++) = (*target)->name;
 211
 212   return name_list;
 213 }
 214 \f
 215 /** Init a bfd for read of the proper format.
 216  */
 217
 218 /* We should be able to find out if the target was defaulted or user-specified.
 219    If the user specified the target explicitly then we should do no search.
 220    I guess the best way to do this is to pass an extra argument which specifies
 221    the DWIM. */
 222
 223 /* I have chanegd this always to set the filepos to the origin before
 224    guessing.  -- Gumby, 14 Februar 1991*/
 225
 226 boolean
 227 bfd_check_format (abfd, format)
 228      bfd *abfd;
 229      bfd_format format;
 230 {
 231 #if obsolete
 232   file_ptr filepos;
 233 #endif
 234   bfd_target **target, *save_targ, *right_targ;
 235   int match_count;
 236
 237   if (!bfd_read_p (abfd) ||
 238       ((int)(abfd->format) < (int)bfd_unknown) ||
 239       ((int)(abfd->format) >= (int)bfd_type_end)) {
 240     bfd_error = invalid_operation;
 241     return false;
 242   }
 243
 244   if (abfd->format != bfd_unknown) return (abfd->format == format) ? true:false;
 245
 246   /* presume the answer is yes */
 247   abfd->format = format;
 248
 249 #if obsolete
 250   filepos = bfd_tell (abfd);
 251 #endif
 252   bfd_seek (abfd, (file_ptr)0, SEEK_SET);       /* instead, rewind! */
 253
 254
 255   right_targ = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
 256   if (right_targ) {
 257     abfd->xvec = right_targ;            /* Set the target as returned */
 258     return true;                        /* File position has moved, BTW */
 259   }
 260
 261   /* This isn't a <format> file in the specified or defaulted target type.
 262      See if we recognize it for any other target type.  (We check them
 263      all to make sure it's uniquely recognized.)  */
 264
 265   save_targ = abfd->xvec;
 266   match_count = 0;
 267   right_targ = 0;
 268
 269   for (target = target_vector; *target != NULL; target++) {
 270     bfd_target *temp;
 271
 272     abfd->xvec = *target;       /* Change BFD's target temporarily */
 273 #if obsolete
 274     bfd_seek (abfd, filepos, SEEK_SET); /* Restore original file position */
 275 #endif
 276     bfd_seek (abfd, (file_ptr)0, SEEK_SET);
 277     temp = BFD_SEND_FMT (abfd, _bfd_check_format, (abfd));
 278     if (temp) {                         /* This format checks out as ok! */
 279       right_targ = temp;
 280       match_count++;
 281 #ifdef GNU960
 282       /* Big- and little-endian b.out archives look the same, but it doesn't
 283        * matter: there is no difference in their headers, and member file byte
 284        * orders will (I hope) be handled appropriately by bfd.  Ditto for big
 285        * and little coff archives.  And the 4 coff/b.out object formats are
 286        * unambiguous.  So accept the first match we find.
 287        */
 288       break;
 289 #endif
 290     }
 291   }
 292
 293   if (match_count == 1) {
 294     abfd->xvec = right_targ;            /* Change BFD's target permanently */
 295     return true;                        /* File position has moved, BTW */
 296   }
 297
 298   abfd->xvec = save_targ;               /* Restore original target type */
 299   abfd->format = bfd_unknown;           /* Restore original format */
 300   bfd_error = ((match_count == 0) ? file_not_recognized :
 301                file_ambiguously_recognized);
 302 #if  obsolete
 303   bfd_seek (abfd, filepos, SEEK_SET);   /* Restore original file position */
 304 #endif
 305   return false;
 306 }
 307
 308 boolean
 309 bfd_set_format (abfd, format)
 310      bfd *abfd;
 311      bfd_format format;
 312 {
 313
 314
 315   if (bfd_read_p (abfd) ||
 316       ((int)abfd->format < (int)bfd_unknown) ||
 317       ((int)abfd->format >= (int)bfd_type_end)) {
 318     bfd_error = invalid_operation;
 319     return false;
 320   }
 321
 322   if (abfd->format != bfd_unknown) return (abfd->format == format) ? true:false;
 323
 324   /* presume the answer is yes */
 325   abfd->format = format;
 326
 327 /*  filepos = bfd_tell (abfd);*/
 328
 329   if (!BFD_SEND_FMT (abfd, _bfd_set_format, (abfd))) {
 330     abfd->format = bfd_unknown;
 331 /*    bfd_seek (abfd, filepos, SEEK_SET);*/
 332     return false;
 333   }
 334
 335   return true;
 336 }
 337 \f
 338 /* Hack object and core file sections */
 339
 340 sec_ptr
 341 DEFUN(bfd_get_section_by_name,(abfd, name),
 342       bfd *abfd AND
 343       CONST char *name)
 344 {
 345   asection *sect;
 346
 347   for (sect = abfd->sections; sect != NULL; sect = sect->next)
 348     if (!strcmp (sect->name, name)) return sect;
 349   return NULL;
 350 }
 351
 352 /* If you try to create a section with a name which is already in use,
 353    returns the old section by that name instead. */
 354 sec_ptr
 355 DEFUN(bfd_make_section,(abfd, name),
 356       bfd *abfd AND
 357       CONST char *name)
 358 {
 359   asection *newsect;
 360   asection **  prev = &abfd->sections;
 361   asection * sect = abfd->sections;
 362
 363   if (abfd->output_has_begun) {
 364     bfd_error = invalid_operation;
 365     return NULL;
 366   }
 367
 368   while (sect) {
 369     if (!strcmp(sect->name, name)) return sect;
 370     prev = &sect->next;
 371     sect = sect->next;
 372   }
 373
 374   newsect = (asection *) bfd_zalloc(abfd, sizeof (asection));
 375   if (newsect == NULL) {
 376     bfd_error = no_memory;
 377     return NULL;
 378   }
 379
 380   newsect->name = name;
 381   newsect->index = abfd->section_count++;
 382   newsect->flags = SEC_NO_FLAGS;
 383
 384
 385   newsect->userdata = 0;
 386   newsect->next = (asection *)NULL;
 387   newsect->relocation = (arelent *)NULL;
 388   newsect->reloc_count = 0;
 389   newsect->line_filepos =0;
 390
 391   if (BFD_SEND (abfd, _new_section_hook, (abfd, newsect)) != true) {
 392     free (newsect);
 393     return NULL;
 394   }
 395
 396   *prev = newsect;
 397   return newsect;
 398 }
 399
 400 /* Call operation on each section.  Operation gets three args: the bfd,
 401    the section, and a void * pointer (whatever the user supplied). */
 402
 403 /* This is attractive except that without lexical closures its use is hard
 404    to make reentrant. */
 405 /*VARARGS2*/
 406 void
 407 bfd_map_over_sections (abfd, operation, user_storage)
 408      bfd *abfd;
 409      void (*operation)();
 410      PTR user_storage;
 411 {
 412   asection *sect;
 413   int i = 0;
 414
 415   for (sect = abfd->sections; sect != NULL; i++, sect = sect->next)
 416     (*operation) (abfd, sect, user_storage);
 417
 418   if (i != abfd->section_count)         /* Debugging */
 419     abort();
 420 }
 421
 422 boolean
 423 bfd_set_section_flags (abfd, section, flags)
 424      bfd *abfd;
 425      sec_ptr section;
 426      flagword flags;
 427 {
 428   if ((flags & bfd_applicable_section_flags (abfd)) != flags) {
 429     bfd_error = invalid_operation;
 430     return false;
 431   }
 432
 433    section->flags = flags;
 434 return true;
 435 }
 436
 437
 438 boolean
 439 bfd_set_section_size (abfd, ptr, val)
 440      bfd *abfd;
 441      sec_ptr ptr;
 442      unsigned long val;
 443 {
 444   /* Once you've started writing to any section you cannot create or change
 445      the size of any others. */
 446
 447   if (abfd->output_has_begun) {
 448     bfd_error = invalid_operation;
 449     return false;
 450   }
 451
 452   ptr->size = val;
 453
 454   return true;
 455 }
 456
 457 boolean
 458 bfd_set_section_contents (abfd, section, location, offset, count)
 459      bfd *abfd;
 460      sec_ptr section;
 461      PTR location;
 462      file_ptr offset;
 463      int count;
 464 {
 465         if (!(bfd_get_section_flags(abfd, section) &
 466               SEC_HAS_CONTENTS)) {
 467                 bfd_error = no_contents;
 468                 return(false);
 469         } /* if section has no contents */
 470
 471   if (BFD_SEND (abfd, _bfd_set_section_contents,
 472             (abfd, section, location, offset, count))) {
 473     abfd->output_has_begun = true;
 474     return true;
 475   }
 476
 477   return false;
 478 }
 479
 480 boolean
 481 bfd_get_section_contents (abfd, section, location, offset, count)
 482      bfd *abfd;
 483      sec_ptr section;
 484      PTR location;
 485      file_ptr offset;
 486      int count;
 487 {
 488   if (section->flags & SEC_CONSTRUCTOR) {
 489     memset(location, 0, count);
 490     return true;
 491   }
 492   else {
 493     return  (BFD_SEND (abfd, _bfd_get_section_contents,
 494                        (abfd, section, location, offset, count)));
 495   }
 496 }
 497
 498 \f
 499 /** Some core file info commands */
 500
 501 /* Returns a read-only string explaining what program was running when
 502    it failed. */
 503
 504 char *
 505 bfd_core_file_failing_command (abfd)
 506      bfd *abfd;
 507 {
 508   if (abfd->format != bfd_core) {
 509     bfd_error = invalid_operation;
 510     return NULL;
 511   }
 512   return BFD_SEND (abfd, _core_file_failing_command, (abfd));
 513 }
 514
 515 int
 516 bfd_core_file_failing_signal (abfd)
 517      bfd *abfd;
 518 {
 519   if (abfd->format != bfd_core) {
 520     bfd_error = invalid_operation;
 521     return NULL;
 522   }
 523   return BFD_SEND (abfd, _core_file_failing_signal, (abfd));
 524 }
 525
 526 boolean
 527 core_file_matches_executable_p (core_bfd, exec_bfd)
 528      bfd *core_bfd, *exec_bfd;
 529 {
 530   if ((core_bfd->format != bfd_core) || (exec_bfd->format != bfd_object)) {
 531     bfd_error = wrong_format;
 532     return false;
 533   }
 534
 535   return BFD_SEND (core_bfd, _core_file_matches_executable_p, (core_bfd, exec_bfd));
 536 }
 537 \f
 538 /** Symbols */
 539
 540 boolean
 541 bfd_set_symtab (abfd, location, symcount)
 542      bfd *abfd;
 543      asymbol **location;
 544      unsigned int symcount;
 545 {
 546   if ((abfd->format != bfd_object) || (bfd_read_p (abfd))) {
 547     bfd_error = invalid_operation;
 548     return false;
 549   }
 550
 551   bfd_get_outsymbols (abfd) = location;
 552   bfd_get_symcount (abfd) = symcount;
 553   return true;
 554 }
 555
 556 /* returns the number of octets of storage required */
 557 unsigned int
 558 get_reloc_upper_bound (abfd, asect)
 559      bfd *abfd;
 560      sec_ptr asect;
 561 {
 562   if (abfd->format != bfd_object) {
 563     bfd_error = invalid_operation;
 564     return 0;
 565   }
 566
 567   return BFD_SEND (abfd, _get_reloc_upper_bound, (abfd, asect));
 568 }
 569
 570 unsigned int
 571 bfd_canonicalize_reloc (abfd, asect, location, symbols)
 572      bfd *abfd;
 573      sec_ptr asect;
 574      arelent **location;
 575      asymbol **symbols;
 576 {
 577   if (abfd->format != bfd_object) {
 578     bfd_error = invalid_operation;
 579     return 0;
 580   }
 581
 582   return BFD_SEND (abfd, _bfd_canonicalize_reloc, (abfd, asect, location, symbols));
 583 }
 584
 585 void
 586 bfd_print_symbol_vandf(file, symbol)
 587 PTR file;
 588 asymbol *symbol;
 589 {
 590   flagword type = symbol->flags;
 591   if (symbol->section != (asection *)NULL)
 592     {
 593       fprintf(file,"%08lx ", symbol->value+symbol->section->vma);
 594     }
 595   else
 596     {
 597       fprintf(file,"%08lx ", symbol->value);
 598     }
 599   fprintf(file,"%c%c%c%c%c%c%c",
 600           (type & BSF_LOCAL)  ? 'l':' ',
 601           (type & BSF_GLOBAL) ? 'g' : ' ',
 602           (type & BSF_IMPORT) ? 'i' : ' ',
 603           (type & BSF_EXPORT) ? 'e' : ' ',
 604           (type & BSF_UNDEFINED) ? 'u' : ' ',
 605           (type & BSF_FORT_COMM) ? 'c' : ' ',
 606           (type & BSF_DEBUGGING) ? 'd' :' ');
 607
 608 }
 609
 610
 611 boolean
 612 bfd_set_file_flags (abfd, flags)
 613      bfd *abfd;
 614      flagword flags;
 615 {
 616   if (abfd->format != bfd_object) {
 617     bfd_error = wrong_format;
 618     return false;
 619   }
 620
 621   if (bfd_read_p (abfd)) {
 622     bfd_error = invalid_operation;
 623     return false;
 624   }
 625
 626   if ((flags & bfd_applicable_file_flags (abfd)) != flags) {
 627     bfd_error = invalid_operation;
 628     return false;
 629   }
 630
 631   bfd_get_file_flags (abfd) = flags;
 632 return true;
 633 }
 634
 635
 636 void
 637 bfd_set_reloc (ignore_abfd, asect, location, count)
 638      bfd *ignore_abfd;
 639      sec_ptr asect;
 640      arelent **location;
 641      unsigned int count;
 642 {
 643   asect->orelocation  = location;
 644   asect->reloc_count = count;
 645 }
 646 /*
 647 If an output_bfd is supplied to this function the generated image
 648 will be relocatable, the relocations are copied to the output file
 649 after they have been changed to reflect the new state of the world.
 650 There are two ways of reflecting the results of partial linkage in an
 651 output file; by modifying the output data in place, and by modifying
 652 the relocation record. Some native formats (eg basic a.out and basic
 653 coff) have no way of specifying an addend in the relocation type, so
 654 the addend has to go in the output data.  This is no big deal since in
 655 these formats the output data slot will always be big enough for the
 656 addend. Complex reloc types with addends were invented to solve just
 657 this problem.
 658 */
 659
 660 bfd_reloc_status_enum_type
 661 bfd_perform_relocation(abfd,
 662                        reloc_entry,
 663                        data,
 664                        input_section,
 665                        output_bfd)
 666 bfd *abfd;
 667 arelent *reloc_entry;
 668 PTR data;
 669 asection *input_section;
 670 bfd *output_bfd;
 671 {
 672   bfd_vma relocation;
 673   bfd_reloc_status_enum_type flag = bfd_reloc_ok;
 674   bfd_vma relocation_before;
 675   bfd_vma addr = reloc_entry->address ;
 676   bfd_vma output_base = 0;
 677   CONST struct rint_struct *howto = reloc_entry->howto;
 678   asection *reloc_target_output_section;
 679   asection *reloc_target_input_section;
 680   asymbol *symbol;
 681
 682   if (reloc_entry->sym_ptr_ptr) {
 683     symbol = *( reloc_entry->sym_ptr_ptr);
 684     if ((symbol->flags & BSF_UNDEFINED) && output_bfd == (bfd *)NULL) {
 685       flag = bfd_reloc_undefined;
 686     }
 687   }
 688   else {
 689     symbol = (asymbol*)NULL;
 690   }
 691
 692   if (howto->special_function){
 693     bfd_reloc_status_enum_type cont;
 694     cont = howto->special_function(abfd,
 695                                    reloc_entry,
 696                                    symbol,
 697                                    data,
 698                                    input_section);
 699     if (cont != bfd_reloc_continue) return cont;
 700   }
 701
 702   /*
 703     Work out which section the relocation is targetted at and the
 704     initial relocation command value.
 705     */
 706
 707
 708   if (symbol != (asymbol *)NULL){
 709     if (symbol->flags & BSF_FORT_COMM) {
 710       relocation = 0;
 711     }
 712     else {
 713       relocation = symbol->value;
 714     }
 715     if (symbol->section != (asection *)NULL)
 716         {
 717           reloc_target_input_section = symbol->section;
 718         }
 719     else {
 720       reloc_target_input_section = (asection *)NULL;
 721     }
 722   }
 723   else if (reloc_entry->section != (asection *)NULL)
 724       {
 725         relocation = 0;
 726         reloc_target_input_section = reloc_entry->section;
 727       }
 728   else {
 729     relocation = 0;
 730     reloc_target_input_section = (asection *)NULL;
 731   }
 732
 733
 734   if (reloc_target_input_section != (asection *)NULL) {
 735
 736     reloc_target_output_section =
 737       reloc_target_input_section->output_section;
 738
 739     if (output_bfd && howto->partial_inplace==false) {
 740       output_base = 0;
 741     }
 742     else {
 743       output_base = reloc_target_output_section->vma;
 744
 745     }
 746
 747     relocation += output_base +   reloc_target_input_section->output_offset;
 748   }
 749
 750   relocation += reloc_entry->addend ;
 751
 752
 753   if(reloc_entry->address > (bfd_vma)(input_section->size))
 754       {
 755         return bfd_reloc_outofrange;
 756       }
 757
 758
 759   if (howto->pc_relative == true)
 760       {
 761         /*
 762           Anything which started out as pc relative should end up that
 763           way too.
 764
 765           There are two ways we can see a pcrel instruction. Sometimes
 766           the pcrel displacement has been partially calculated, it
 767           includes the distance from the start of the section to the
 768           instruction in it (eg sun3), and sometimes the field is
 769           totally blank - eg m88kbcs.
 770           */
 771
 772
 773         relocation -=
 774           output_base +   input_section->output_offset;
 775
 776         if (howto->pcrel_offset == true) {
 777           relocation -= reloc_entry->address;
 778         }
 779
 780       }
 781
 782   if (output_bfd!= (bfd *)NULL) {
 783     if ( howto->partial_inplace == false)  {
 784       /*
 785         This is a partial relocation, and we want to apply the relocation
 786         to the reloc entry rather than the raw data. Modify the reloc
 787         inplace to reflect what we now know.
 788         */
 789       reloc_entry->addend = relocation  ;
 790       reloc_entry->section = reloc_target_input_section;
 791       if (reloc_target_input_section != (asection *)NULL) {
 792         /* If we know the output section we can forget the symbol */
 793         reloc_entry->sym_ptr_ptr = (asymbol**)NULL;
 794       }
 795       reloc_entry->address +=
 796         input_section->output_offset;
 797       return flag;
 798     }
 799     else
 800         {
 801           /* This is a partial relocation, but inplace, so modify the
 802              reloc record a bit
 803              */
 804
 805         }
 806   }
 807
 808   reloc_entry->addend = 0;
 809
 810
 811   /*
 812     Either we are relocating all the way, or we don't want to apply
 813     the relocation to the reloc entry (probably because there isn't
 814     any room in the output format to describe addends to relocs)
 815     */
 816   relocation >>= howto->rightshift;
 817
 818   /* Shift everything up to where it's going to be used */
 819
 820   relocation <<= howto->bitpos;
 821
 822
 823   /* Wait for the day when all have the mask in them */
 824
 825
 826
 827   relocation_before = relocation;
 828
 829
 830   /* What we do:
 831      i instruction to be left alone
 832      o offset within instruction
 833      r relocation offset to apply
 834      S src mask
 835      D dst mask
 836      N ~dst mask
 837      A part 1
 838      B part 2
 839      R result
 840
 841      Do this:
 842      i i i i i o o o o o        from bfd_get<size>
 843      and           S S S S S    to get the size offset we want
 844      +   r r r r r r r r r r  to get the final value to place
 845      and           D D D D D  to chop to right size
 846      -----------------------
 847      A A A A A
 848      And this:
 849      ...   i i i i i o o o o o  from bfd_get<size>
 850      and   N N N N N            get instruction
 851      -----------------------
 852      ...   B B B B B
 853
 854      And then:
 855      B B B B B
 856      or              A A A A A
 857      -----------------------
 858      R R R R R R R R R R        put into bfd_put<size>
 859      */
 860
 861 #define DOIT(x) \
 862   x = ( (x & ~howto->dst_mask) | (((x & howto->src_mask) +  relocation) & howto->dst_mask))
 863
 864     switch (howto->size)
 865         {
 866         case 0:
 867             {
 868               char x = bfd_getchar(abfd, (char *)data + addr);
 869               DOIT(x);
 870               bfd_putchar(abfd,x, (unsigned char *) data + addr);
 871             }
 872           break;
 873
 874         case 1:
 875             {
 876               short x = bfd_getshort(abfd, (bfd_byte *)data + addr);
 877               DOIT(x);
 878               bfd_putshort(abfd, x,   (unsigned char *)data + addr);
 879             }
 880           break;
 881         case 2:
 882             {
 883               long  x = bfd_getlong(abfd, (bfd_byte *) data + addr);
 884               DOIT(x);
 885               bfd_putlong(abfd,x,    (bfd_byte *)data + addr);
 886             }
 887           break;
 888         case 3:
 889           /* Do nothing */
 890           break;
 891         default:
 892           return bfd_reloc_other;
 893         }
 894
 895   return flag;
 896 }
 897
 898 void
 899 bfd_assert(file, line)
 900 char *file;
 901 int line;
 902 {
 903   printf("bfd assertion fail %s:%d\n",file,line);
 904 }
 905
 906
 907 boolean
 908 bfd_set_start_address(abfd, vma)
 909 bfd *abfd;
 910 bfd_vma vma;
 911 {
 912   abfd->start_address = vma;
 913   return true;
 914 }
 915
 916
 917 bfd_vma bfd_log2(x)
 918 bfd_vma x;
 919 {
 920   bfd_vma  result = 0;
 921   while ( (bfd_vma)(1<< result) < x)
 922     result++;
 923   return result;
 924 }
 925
 926 /* bfd_get_mtime:  Return cached file modification time (e.g. as read
 927    from archive header for archive members, or from file system if we have
 928    been called before); else determine modify time, cache it, and
 929    return it.  */
 930
 931 long
 932 bfd_get_mtime (abfd)
 933      bfd *abfd;
 934 {
 935   FILE *fp;
 936   struct stat buf;
 937
 938   if (abfd->mtime_set)
 939     return abfd->mtime;
 940
 941   fp = bfd_cache_lookup (abfd);
 942   if (0 != fstat (fileno (fp), &buf))
 943     return 0;
 944
 945   abfd->mtime_set = true;
 946   abfd->mtime = buf.st_mtime;
 947   return abfd->mtime;
 948 }