gdb/solib-darwin.c

   1 /* Handle Darwin shared libraries for GDB, the GNU Debugger.
   2
   3    Copyright (C) 2009-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21
  22 #include "symtab.h"
  23 #include "bfd.h"
  24 #include "symfile.h"
  25 #include "objfiles.h"
  26 #include "gdbcore.h"
  27 #include "target.h"
  28 #include "inferior.h"
  29 #include "regcache.h"
  30 #include "gdbthread.h"
  31 #include "gdb_bfd.h"
  32
  33 #include "solist.h"
  34 #include "solib.h"
  35 #include "solib-svr4.h"
  36
  37 #include "bfd-target.h"
  38 #include "elf-bfd.h"
  39 #include "exec.h"
  40 #include "auxv.h"
  41 #include "mach-o.h"
  42 #include "mach-o/external.h"
  43
  44 struct gdb_dyld_image_info
  45 {
  46   /* Base address (which corresponds to the Mach-O header).  */
  47   CORE_ADDR mach_header;
  48   /* Image file path.  */
  49   CORE_ADDR file_path;
  50   /* st.m_time of image file.  */
  51   unsigned long mtime;
  52 };
  53
  54 /* Content of inferior dyld_all_image_infos structure.
  55    See /usr/include/mach-o/dyld_images.h for the documentation.  */
  56 struct gdb_dyld_all_image_infos
  57 {
  58   /* Version (1).  */
  59   unsigned int version;
  60   /* Number of images.  */
  61   unsigned int count;
  62   /* Image description.  */
  63   CORE_ADDR info;
  64   /* Notifier (function called when a library is added or removed).  */
  65   CORE_ADDR notifier;
  66 };
  67
  68 /* Current all_image_infos version.  */
  69 #define DYLD_VERSION_MIN 1
  70 #define DYLD_VERSION_MAX 15
  71
  72 /* Per PSPACE specific data.  */
  73 struct darwin_info
  74 {
  75   /* Address of structure dyld_all_image_infos in inferior.  */
  76   CORE_ADDR all_image_addr = 0;
  77
  78   /* Gdb copy of dyld_all_info_infos.  */
  79   struct gdb_dyld_all_image_infos all_image {};
  80 };
  81
  82 /* Per-program-space data key.  */
  83 static const registry<program_space>::key<darwin_info>
  84   solib_darwin_pspace_data;
  85
  86 /* Get the current darwin data.  If none is found yet, add it now.  This
  87    function always returns a valid object.  */
  88
  89 static struct darwin_info *
  90 get_darwin_info (void)
  91 {
  92   struct darwin_info *info;
  93
  94   info = solib_darwin_pspace_data.get (current_program_space);
  95   if (info != NULL)
  96     return info;
  97
  98   return solib_darwin_pspace_data.emplace (current_program_space);
  99 }
 100
 101 /* Return non-zero if the version in dyld_all_image is known.  */
 102
 103 static int
 104 darwin_dyld_version_ok (const struct darwin_info *info)
 105 {
 106   return info->all_image.version >= DYLD_VERSION_MIN
 107     && info->all_image.version <= DYLD_VERSION_MAX;
 108 }
 109
 110 /* Read dyld_all_image from inferior.  */
 111
 112 static void
 113 darwin_load_image_infos (struct darwin_info *info)
 114 {
 115   gdb_byte buf[24];
 116   enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
 117   struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 118   int len;
 119
 120   /* If the structure address is not known, don't continue.  */
 121   if (info->all_image_addr == 0)
 122     return;
 123
 124   /* The structure has 4 fields: version (4 bytes), count (4 bytes),
 125      info (pointer) and notifier (pointer).  */
 126   len = 4 + 4 + 2 * TYPE_LENGTH (ptr_type);
 127   gdb_assert (len <= sizeof (buf));
 128   memset (&info->all_image, 0, sizeof (info->all_image));
 129
 130   /* Read structure raw bytes from target.  */
 131   if (target_read_memory (info->all_image_addr, buf, len))
 132     return;
 133
 134   /* Extract the fields.  */
 135   info->all_image.version = extract_unsigned_integer (buf, 4, byte_order);
 136   if (!darwin_dyld_version_ok (info))
 137     return;
 138
 139   info->all_image.count = extract_unsigned_integer (buf + 4, 4, byte_order);
 140   info->all_image.info = extract_typed_address (buf + 8, ptr_type);
 141   info->all_image.notifier = extract_typed_address
 142     (buf + 8 + TYPE_LENGTH (ptr_type), ptr_type);
 143 }
 144
 145 /* Link map info to include in an allocated so_list entry.  */
 146
 147 struct lm_info_darwin : public lm_info_base
 148 {
 149   /* The target location of lm.  */
 150   CORE_ADDR lm_addr = 0;
 151 };
 152
 153 /* Lookup the value for a specific symbol.  */
 154
 155 static CORE_ADDR
 156 lookup_symbol_from_bfd (bfd *abfd, const char *symname)
 157 {
 158   long storage_needed;
 159   asymbol **symbol_table;
 160   unsigned int number_of_symbols;
 161   unsigned int i;
 162   CORE_ADDR symaddr = 0;
 163
 164   storage_needed = bfd_get_symtab_upper_bound (abfd);
 165
 166   if (storage_needed <= 0)
 167     return 0;
 168
 169   symbol_table = (asymbol **) xmalloc (storage_needed);
 170   number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
 171
 172   for (i = 0; i < number_of_symbols; i++)
 173     {
 174       asymbol *sym = symbol_table[i];
 175
 176       if (strcmp (sym->name, symname) == 0
 177           && (sym->section->flags & (SEC_CODE | SEC_DATA)) != 0)
 178         {
 179           /* BFD symbols are section relative.  */
 180           symaddr = sym->value + sym->section->vma;
 181           break;
 182         }
 183     }
 184   xfree (symbol_table);
 185
 186   return symaddr;
 187 }
 188
 189 /* Return program interpreter string.  */
 190
 191 static char *
 192 find_program_interpreter (void)
 193 {
 194   char *buf = NULL;
 195
 196   /* If we have an current exec_bfd, get the interpreter from the load
 197      commands.  */
 198   if (current_program_space->exec_bfd ())
 199     {
 200       bfd_mach_o_load_command *cmd;
 201
 202       if (bfd_mach_o_lookup_command (current_program_space->exec_bfd (),
 203                                      BFD_MACH_O_LC_LOAD_DYLINKER, &cmd) == 1)
 204         return cmd->command.dylinker.name_str;
 205     }
 206
 207   /* If we didn't find it, read from memory.
 208      FIXME: todo.  */
 209   return buf;
 210 }
 211
 212 /*  Not used.  I don't see how the main symbol file can be found: the
 213     interpreter name is needed and it is known from the executable file.
 214     Note that darwin-nat.c implements pid_to_exec_file.  */
 215
 216 static int
 217 open_symbol_file_object (int from_tty)
 218 {
 219   return 0;
 220 }
 221
 222 /* Build a list of currently loaded shared objects.  See solib-svr4.c.  */
 223
 224 static struct so_list *
 225 darwin_current_sos (void)
 226 {
 227   struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 228   enum bfd_endian byte_order = type_byte_order (ptr_type);
 229   int ptr_len = TYPE_LENGTH (ptr_type);
 230   unsigned int image_info_size;
 231   struct so_list *head = NULL;
 232   struct so_list *tail = NULL;
 233   int i;
 234   struct darwin_info *info = get_darwin_info ();
 235
 236   /* Be sure image infos are loaded.  */
 237   darwin_load_image_infos (info);
 238
 239   if (!darwin_dyld_version_ok (info))
 240     return NULL;
 241
 242   image_info_size = ptr_len * 3;
 243
 244   /* Read infos for each solib.
 245      The first entry was rumored to be the executable itself, but this is not
 246      true when a large number of shared libraries are used (table expanded ?).
 247      We now check all entries, but discard executable images.  */
 248   for (i = 0; i < info->all_image.count; i++)
 249     {
 250       CORE_ADDR iinfo = info->all_image.info + i * image_info_size;
 251       gdb_byte buf[image_info_size];
 252       CORE_ADDR load_addr;
 253       CORE_ADDR path_addr;
 254       struct mach_o_header_external hdr;
 255       unsigned long hdr_val;
 256
 257       /* Read image info from inferior.  */
 258       if (target_read_memory (iinfo, buf, image_info_size))
 259         break;
 260
 261       load_addr = extract_typed_address (buf, ptr_type);
 262       path_addr = extract_typed_address (buf + ptr_len, ptr_type);
 263
 264       /* Read Mach-O header from memory.  */
 265       if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4))
 266         break;
 267       /* Discard wrong magic numbers.  Shouldn't happen.  */
 268       hdr_val = extract_unsigned_integer
 269         (hdr.magic, sizeof (hdr.magic), byte_order);
 270       if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64)
 271         continue;
 272       /* Discard executable.  Should happen only once.  */
 273       hdr_val = extract_unsigned_integer
 274         (hdr.filetype, sizeof (hdr.filetype), byte_order);
 275       if (hdr_val == BFD_MACH_O_MH_EXECUTE)
 276         continue;
 277
 278       gdb::unique_xmalloc_ptr<char> file_path
 279         = target_read_string (path_addr, SO_NAME_MAX_PATH_SIZE - 1);
 280       if (file_path == nullptr)
 281         break;
 282
 283       /* Create and fill the new so_list element.  */
 284       gdb::unique_xmalloc_ptr<struct so_list> newobj (XCNEW (struct so_list));
 285
 286       lm_info_darwin *li = new lm_info_darwin;
 287       newobj->lm_info = li;
 288
 289       strncpy (newobj->so_name, file_path.get (), SO_NAME_MAX_PATH_SIZE - 1);
 290       newobj->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
 291       strcpy (newobj->so_original_name, newobj->so_name);
 292       li->lm_addr = load_addr;
 293
 294       if (head == NULL)
 295         head = newobj.get ();
 296       else
 297         tail->next = newobj.get ();
 298       tail = newobj.release ();
 299     }
 300
 301   return head;
 302 }
 303
 304 /* Check LOAD_ADDR points to a Mach-O executable header.  Return LOAD_ADDR
 305    in case of success, 0 in case of failure.  */
 306
 307 static CORE_ADDR
 308 darwin_validate_exec_header (CORE_ADDR load_addr)
 309 {
 310   enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
 311   struct mach_o_header_external hdr;
 312   unsigned long hdr_val;
 313
 314   /* Read Mach-O header from memory.  */
 315   if (target_read_memory (load_addr, (gdb_byte *) &hdr, sizeof (hdr) - 4))
 316     return 0;
 317
 318   /* Discard wrong magic numbers.  Shouldn't happen.  */
 319   hdr_val = extract_unsigned_integer
 320     (hdr.magic, sizeof (hdr.magic), byte_order);
 321   if (hdr_val != BFD_MACH_O_MH_MAGIC && hdr_val != BFD_MACH_O_MH_MAGIC_64)
 322     return 0;
 323
 324   /* Check executable.  */
 325   hdr_val = extract_unsigned_integer
 326     (hdr.filetype, sizeof (hdr.filetype), byte_order);
 327   if (hdr_val == BFD_MACH_O_MH_EXECUTE)
 328     return load_addr;
 329
 330   return 0;
 331 }
 332
 333 /* Get the load address of the executable using dyld list of images.
 334    We assume that the dyld info are correct (which is wrong if the target
 335    is stopped at the first instruction).  */
 336
 337 static CORE_ADDR
 338 darwin_read_exec_load_addr_from_dyld (struct darwin_info *info)
 339 {
 340   struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 341   int ptr_len = TYPE_LENGTH (ptr_type);
 342   unsigned int image_info_size = ptr_len * 3;
 343   int i;
 344
 345   /* Read infos for each solib.  One of them should be the executable.  */
 346   for (i = 0; i < info->all_image.count; i++)
 347     {
 348       CORE_ADDR iinfo = info->all_image.info + i * image_info_size;
 349       gdb_byte buf[image_info_size];
 350       CORE_ADDR load_addr;
 351
 352       /* Read image info from inferior.  */
 353       if (target_read_memory (iinfo, buf, image_info_size))
 354         break;
 355
 356       load_addr = extract_typed_address (buf, ptr_type);
 357       if (darwin_validate_exec_header (load_addr) == load_addr)
 358         return load_addr;
 359     }
 360
 361   return 0;
 362 }
 363
 364 /* Get the load address of the executable when the PC is at the dyld
 365    entry point using parameter passed by the kernel (at SP). */
 366
 367 static CORE_ADDR
 368 darwin_read_exec_load_addr_at_init (struct darwin_info *info)
 369 {
 370   struct gdbarch *gdbarch = target_gdbarch ();
 371   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 372   int addr_size = gdbarch_addr_bit (gdbarch) / 8;
 373   ULONGEST load_ptr_addr;
 374   ULONGEST load_addr;
 375   gdb_byte buf[8];
 376
 377   /* Get SP.  */
 378   if (regcache_cooked_read_unsigned (get_current_regcache (),
 379                                      gdbarch_sp_regnum (gdbarch),
 380                                      &load_ptr_addr) != REG_VALID)
 381     return 0;
 382
 383   /* Read value at SP (image load address).  */
 384   if (target_read_memory (load_ptr_addr, buf, addr_size))
 385     return 0;
 386
 387   load_addr = extract_unsigned_integer (buf, addr_size, byte_order);
 388
 389   return darwin_validate_exec_header (load_addr);
 390 }
 391
 392 /* Return 1 if PC lies in the dynamic symbol resolution code of the
 393    run time loader.  */
 394
 395 static int
 396 darwin_in_dynsym_resolve_code (CORE_ADDR pc)
 397 {
 398   return 0;
 399 }
 400
 401 /* A wrapper for bfd_mach_o_fat_extract that handles reference
 402    counting properly.  This will either return NULL, or return a new
 403    reference to a BFD.  */
 404
 405 static gdb_bfd_ref_ptr
 406 gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format,
 407                             const bfd_arch_info_type *arch)
 408 {
 409   bfd *result = bfd_mach_o_fat_extract (abfd, format, arch);
 410
 411   if (result == NULL)
 412     return NULL;
 413
 414   if (result == abfd)
 415     gdb_bfd_ref (result);
 416   else
 417     gdb_bfd_mark_parent (result, abfd);
 418
 419   return gdb_bfd_ref_ptr (result);
 420 }
 421
 422 /* Return the BFD for the program interpreter.  */
 423
 424 static gdb_bfd_ref_ptr
 425 darwin_get_dyld_bfd ()
 426 {
 427   char *interp_name;
 428
 429   /* This method doesn't work with an attached process.  */
 430   if (current_inferior ()->attach_flag)
 431     return NULL;
 432
 433   /* Find the program interpreter.  */
 434   interp_name = find_program_interpreter ();
 435   if (!interp_name)
 436     return NULL;
 437
 438   /* Create a bfd for the interpreter.  */
 439   gdb_bfd_ref_ptr dyld_bfd (gdb_bfd_open (interp_name, gnutarget));
 440   if (dyld_bfd != NULL)
 441     {
 442       gdb_bfd_ref_ptr sub
 443         (gdb_bfd_mach_o_fat_extract (dyld_bfd.get (), bfd_object,
 444                                      gdbarch_bfd_arch_info (target_gdbarch ())));
 445       dyld_bfd = sub;
 446     }
 447   return dyld_bfd;
 448 }
 449
 450 /* Extract dyld_all_image_addr when the process was just created, assuming the
 451    current PC is at the entry of the dynamic linker.  */
 452
 453 static void
 454 darwin_solib_get_all_image_info_addr_at_init (struct darwin_info *info)
 455 {
 456   CORE_ADDR load_addr = 0;
 457   gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd ();
 458
 459   if (dyld_bfd == NULL)
 460     return;
 461
 462   /* We find the dynamic linker's base address by examining
 463      the current pc (which should point at the entry point for the
 464      dynamic linker) and subtracting the offset of the entry point.  */
 465   load_addr = (regcache_read_pc (get_current_regcache ())
 466                - bfd_get_start_address (dyld_bfd.get ()));
 467
 468   /* Now try to set a breakpoint in the dynamic linker.  */
 469   info->all_image_addr =
 470     lookup_symbol_from_bfd (dyld_bfd.get (), "_dyld_all_image_infos");
 471
 472   if (info->all_image_addr == 0)
 473     return;
 474
 475   info->all_image_addr += load_addr;
 476 }
 477
 478 /* Extract dyld_all_image_addr reading it from
 479    TARGET_OBJECT_DARWIN_DYLD_INFO.  */
 480
 481 static void
 482 darwin_solib_read_all_image_info_addr (struct darwin_info *info)
 483 {
 484   gdb_byte buf[8];
 485   LONGEST len;
 486   struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
 487
 488   /* Sanity check.  */
 489   if (TYPE_LENGTH (ptr_type) > sizeof (buf))
 490     return;
 491
 492   len = target_read (current_inferior ()->top_target (),
 493                      TARGET_OBJECT_DARWIN_DYLD_INFO,
 494                      NULL, buf, 0, TYPE_LENGTH (ptr_type));
 495   if (len <= 0)
 496     return;
 497
 498   /* The use of BIG endian is intended, as BUF is a raw stream of bytes.  This
 499       makes the support of remote protocol easier.  */
 500   info->all_image_addr = extract_unsigned_integer (buf, len, BFD_ENDIAN_BIG);
 501 }
 502
 503 /* Shared library startup support.  See documentation in solib-svr4.c.  */
 504
 505 static void
 506 darwin_solib_create_inferior_hook (int from_tty)
 507 {
 508   /* Everything below only makes sense if we have a running inferior.  */
 509   if (!target_has_execution ())
 510     return;
 511
 512   struct darwin_info *info = get_darwin_info ();
 513   CORE_ADDR load_addr;
 514
 515   info->all_image_addr = 0;
 516
 517   darwin_solib_read_all_image_info_addr (info);
 518
 519   if (info->all_image_addr == 0)
 520     darwin_solib_get_all_image_info_addr_at_init (info);
 521
 522   if (info->all_image_addr == 0)
 523     return;
 524
 525   darwin_load_image_infos (info);
 526
 527   if (!darwin_dyld_version_ok (info))
 528     {
 529       warning (_("unhandled dyld version (%d)"), info->all_image.version);
 530       return;
 531     }
 532
 533   if (info->all_image.count != 0)
 534     {
 535       /* Possible relocate the main executable (PIE).  */
 536       load_addr = darwin_read_exec_load_addr_from_dyld (info);
 537     }
 538   else
 539     {
 540       /* Possible issue:
 541          Do not break on the notifier if dyld is not initialized (deduced from
 542          count == 0).  In that case, dyld hasn't relocated itself and the
 543          notifier may point to a wrong address.  */
 544
 545       load_addr = darwin_read_exec_load_addr_at_init (info);
 546     }
 547
 548   if (load_addr != 0 && current_program_space->symfile_object_file != NULL)
 549     {
 550       CORE_ADDR vmaddr;
 551
 552       /* Find the base address of the executable.  */
 553       vmaddr = bfd_mach_o_get_base_address (current_program_space->exec_bfd ());
 554
 555       /* Relocate.  */
 556       if (vmaddr != load_addr)
 557         objfile_rebase (current_program_space->symfile_object_file,
 558                         load_addr - vmaddr);
 559     }
 560
 561   /* Set solib notifier (to reload list of shared libraries).  */
 562   CORE_ADDR notifier = info->all_image.notifier;
 563
 564   if (info->all_image.count == 0)
 565     {
 566       /* Dyld hasn't yet relocated itself, so the notifier address may
 567          be incorrect (as it has to be relocated).  */
 568       CORE_ADDR start
 569         = bfd_get_start_address (current_program_space->exec_bfd ());
 570       if (start == 0)
 571         notifier = 0;
 572       else
 573         {
 574           gdb_bfd_ref_ptr dyld_bfd = darwin_get_dyld_bfd ();
 575           if (dyld_bfd != NULL)
 576             {
 577               CORE_ADDR dyld_bfd_start_address;
 578               CORE_ADDR dyld_relocated_base_address;
 579               CORE_ADDR pc;
 580
 581               dyld_bfd_start_address = bfd_get_start_address (dyld_bfd.get());
 582
 583               /* We find the dynamic linker's base address by examining
 584                  the current pc (which should point at the entry point
 585                  for the dynamic linker) and subtracting the offset of
 586                  the entry point.  */
 587
 588               pc = regcache_read_pc (get_current_regcache ());
 589               dyld_relocated_base_address = pc - dyld_bfd_start_address;
 590
 591               /* We get the proper notifier relocated address by
 592                  adding the dyld relocated base address to the current
 593                  notifier offset value.  */
 594
 595               notifier += dyld_relocated_base_address;
 596             }
 597         }
 598     }
 599
 600   /* Add the breakpoint which is hit by dyld when the list of solib is
 601      modified.  */
 602   if (notifier != 0)
 603     create_solib_event_breakpoint (target_gdbarch (), notifier);
 604 }
 605
 606 static void
 607 darwin_clear_solib (void)
 608 {
 609   struct darwin_info *info = get_darwin_info ();
 610
 611   info->all_image_addr = 0;
 612   info->all_image.version = 0;
 613 }
 614
 615 static void
 616 darwin_free_so (struct so_list *so)
 617 {
 618   lm_info_darwin *li = (lm_info_darwin *) so->lm_info;
 619
 620   delete li;
 621 }
 622
 623 /* The section table is built from bfd sections using bfd VMAs.
 624    Relocate these VMAs according to solib info.  */
 625
 626 static void
 627 darwin_relocate_section_addresses (struct so_list *so,
 628                                    struct target_section *sec)
 629 {
 630   lm_info_darwin *li = (lm_info_darwin *) so->lm_info;
 631
 632   sec->addr += li->lm_addr;
 633   sec->endaddr += li->lm_addr;
 634
 635   /* Best effort to set addr_high/addr_low.  This is used only by
 636      'info sharedlibary'.  */
 637   if (so->addr_high == 0)
 638     {
 639       so->addr_low = sec->addr;
 640       so->addr_high = sec->endaddr;
 641     }
 642   if (sec->endaddr > so->addr_high)
 643     so->addr_high = sec->endaddr;
 644   if (sec->addr < so->addr_low)
 645     so->addr_low = sec->addr;
 646 }
 647 \f
 648 static gdb_bfd_ref_ptr
 649 darwin_bfd_open (const char *pathname)
 650 {
 651   int found_file;
 652
 653   /* Search for shared library file.  */
 654   gdb::unique_xmalloc_ptr<char> found_pathname
 655     = solib_find (pathname, &found_file);
 656   if (found_pathname == NULL)
 657     perror_with_name (pathname);
 658
 659   /* Open bfd for shared library.  */
 660   gdb_bfd_ref_ptr abfd (solib_bfd_fopen (found_pathname.get (), found_file));
 661
 662   gdb_bfd_ref_ptr res
 663     (gdb_bfd_mach_o_fat_extract (abfd.get (), bfd_object,
 664                                  gdbarch_bfd_arch_info (target_gdbarch ())));
 665   if (res == NULL)
 666     error (_("`%s': not a shared-library: %s"),
 667            bfd_get_filename (abfd.get ()), bfd_errmsg (bfd_get_error ()));
 668
 669   /* The current filename for fat-binary BFDs is a name generated
 670      by BFD, usually a string containing the name of the architecture.
 671      Reset its value to the actual filename.  */
 672   bfd_set_filename (res.get (), pathname);
 673
 674   return res;
 675 }
 676
 677 struct target_so_ops darwin_so_ops;
 678
 679 void _initialize_darwin_solib ();
 680 void
 681 _initialize_darwin_solib ()
 682 {
 683   darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses;
 684   darwin_so_ops.free_so = darwin_free_so;
 685   darwin_so_ops.clear_solib = darwin_clear_solib;
 686   darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook;
 687   darwin_so_ops.current_sos = darwin_current_sos;
 688   darwin_so_ops.open_symbol_file_object = open_symbol_file_object;
 689   darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code;
 690   darwin_so_ops.bfd_open = darwin_bfd_open;
 691 }