gdb/solib-aix.c

   1 /* Copyright (C) 2013 Free Software Foundation, Inc.
   2
   3    This file is part of GDB.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include "defs.h"
  19 #include "solib-aix.h"
  20 #include "solist.h"
  21 #include "inferior.h"
  22 #include "gdb_bfd.h"
  23 #include "gdbcore.h"
  24 #include "objfiles.h"
  25 #include "symtab.h"
  26 #include "xcoffread.h"
  27 #include "observer.h"
  28 #include "gdbcmd.h"
  29
  30 /* Variable controlling the output of the debugging traces for
  31    this module.  */
  32 static int solib_aix_debug;
  33
  34 /* Our private data in struct so_list.  */
  35
  36 struct lm_info
  37 {
  38   /* The name of the file mapped by the loader.  Apart from the entry
  39      for the main executable, this is usually a shared library (which,
  40      on AIX, is an archive library file, created using the "ar"
  41      command).  */
  42   char *filename;
  43
  44   /* The name of the shared object file with the actual dynamic
  45      loading dependency.  This may be NULL (Eg. main executable).  */
  46   char *member_name;
  47
  48   /* The address in inferior memory where the text section got mapped.  */
  49   CORE_ADDR text_addr;
  50
  51   /* The size of the text section, obtained via the loader data.  */
  52   ULONGEST text_size;
  53
  54   /* The address in inferior memory where the data section got mapped.  */
  55   CORE_ADDR data_addr;
  56
  57   /* The size of the data section, obtained via the loader data.  */
  58   ULONGEST data_size;
  59 };
  60
  61 typedef struct lm_info *lm_info_p;
  62 DEF_VEC_P(lm_info_p);
  63
  64 /* Return a deep copy of the given struct lm_info object.  */
  65
  66 static struct lm_info *
  67 solib_aix_new_lm_info (struct lm_info *info)
  68 {
  69   struct lm_info *result = xmalloc (sizeof (struct lm_info));
  70
  71   memcpy (result, info, sizeof (struct lm_info));
  72   result->filename = xstrdup (info->filename);
  73   if (info->member_name != NULL)
  74     result->member_name = xstrdup (info->member_name);
  75
  76   return result;
  77 }
  78
  79 /* Free the memory allocated for the given lm_info.  */
  80
  81 static void
  82 solib_aix_xfree_lm_info (struct lm_info *info)
  83 {
  84   xfree (info->filename);
  85   xfree (info->member_name);
  86   xfree (info);
  87 }
  88
  89 /* This module's per-inferior data.  */
  90
  91 struct solib_aix_inferior_data
  92 {
  93   /* The list of shared libraries.  NULL if not computed yet.
  94
  95      Note that the first element of this list is always the main
  96      executable, which is not technically a shared library.  But
  97      we need that information to perform its relocation, and
  98      the same principles applied to shared libraries also apply
  99      to the main executable.  So it's simpler to keep it as part
 100      of this list.  */
 101   VEC (lm_info_p) *library_list;
 102 };
 103
 104 /* Key to our per-inferior data.  */
 105 static const struct inferior_data *solib_aix_inferior_data_handle;
 106
 107 /* Return this module's data for the given inferior.
 108    If none is found, add a zero'ed one now.  */
 109
 110 static struct solib_aix_inferior_data *
 111 get_solib_aix_inferior_data (struct inferior *inf)
 112 {
 113   struct solib_aix_inferior_data *data;
 114
 115   data = inferior_data (inf, solib_aix_inferior_data_handle);
 116   if (data == NULL)
 117     {
 118       data = XZALLOC (struct solib_aix_inferior_data);
 119       set_inferior_data (inf, solib_aix_inferior_data_handle, data);
 120     }
 121
 122   return data;
 123 }
 124
 125 #if !defined(HAVE_LIBEXPAT)
 126
 127 /* Dummy implementation if XML support is not compiled in.  */
 128
 129 static VEC (lm_info_p) *
 130 solib_aix_parse_libraries (const char *library)
 131 {
 132   static int have_warned;
 133
 134   if (!have_warned)
 135     {
 136       have_warned = 1;
 137       warning (_("Can not parse XML library list; XML support was disabled "
 138                  "at compile time"));
 139     }
 140
 141   return NULL;
 142 }
 143
 144 /* Dummy implementation if XML support is not compiled in.  */
 145
 146 static void
 147 solib_aix_free_library_list (void *p)
 148 {
 149 }
 150
 151 #else /* HAVE_LIBEXPAT */
 152
 153 #include "xml-support.h"
 154
 155 /* Handle the start of a <library> element.  */
 156
 157 static void
 158 library_list_start_library (struct gdb_xml_parser *parser,
 159                             const struct gdb_xml_element *element,
 160                             void *user_data,
 161                             VEC (gdb_xml_value_s) *attributes)
 162 {
 163   VEC (lm_info_p) **list = user_data;
 164   struct lm_info *item = XZALLOC (struct lm_info);
 165   struct gdb_xml_value *attr;
 166
 167   attr = xml_find_attribute (attributes, "name");
 168   item->filename = xstrdup (attr->value);
 169
 170   attr = xml_find_attribute (attributes, "member");
 171   if (attr != NULL)
 172     item->member_name = xstrdup (attr->value);
 173
 174   attr = xml_find_attribute (attributes, "text_addr");
 175   item->text_addr = * (ULONGEST *) attr->value;
 176
 177   attr = xml_find_attribute (attributes, "text_size");
 178   item->text_size = * (ULONGEST *) attr->value;
 179
 180   attr = xml_find_attribute (attributes, "data_addr");
 181   item->data_addr = * (ULONGEST *) attr->value;
 182
 183   attr = xml_find_attribute (attributes, "data_size");
 184   item->data_size = * (ULONGEST *) attr->value;
 185
 186   VEC_safe_push (lm_info_p, *list, item);
 187 }
 188
 189 /* Handle the start of a <library-list-aix> element.  */
 190
 191 static void
 192 library_list_start_list (struct gdb_xml_parser *parser,
 193                          const struct gdb_xml_element *element,
 194                          void *user_data, VEC (gdb_xml_value_s) *attributes)
 195 {
 196   char *version = xml_find_attribute (attributes, "version")->value;
 197
 198   if (strcmp (version, "1.0") != 0)
 199     gdb_xml_error (parser,
 200                    _("Library list has unsupported version \"%s\""),
 201                    version);
 202 }
 203
 204 /* Discard the constructed library list.  */
 205
 206 static void
 207 solib_aix_free_library_list (void *p)
 208 {
 209   VEC (lm_info_p) **result = p;
 210   struct lm_info *info;
 211   int ix;
 212
 213   if (solib_aix_debug)
 214     fprintf_unfiltered (gdb_stdlog, "DEBUG: solib_aix_free_library_list\n");
 215
 216   for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
 217     solib_aix_xfree_lm_info (info);
 218   VEC_free (lm_info_p, *result);
 219   *result = NULL;
 220 }
 221
 222 /* The allowed elements and attributes for an AIX library list
 223    described in XML format.  The root element is a <library-list-aix>.  */
 224
 225 static const struct gdb_xml_attribute library_attributes[] =
 226 {
 227   { "name", GDB_XML_AF_NONE, NULL, NULL },
 228   { "member", GDB_XML_AF_OPTIONAL, NULL, NULL },
 229   { "text_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 230   { "text_size", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 231   { "data_addr", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 232   { "data_size", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 233   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 234 };
 235
 236 static const struct gdb_xml_element library_list_children[] =
 237 {
 238   { "library", library_attributes, NULL,
 239     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 240     library_list_start_library, NULL},
 241   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 242 };
 243
 244 static const struct gdb_xml_attribute library_list_attributes[] =
 245 {
 246   { "version", GDB_XML_AF_NONE, NULL, NULL },
 247   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 248 };
 249
 250 static const struct gdb_xml_element library_list_elements[] =
 251 {
 252   { "library-list-aix", library_list_attributes, library_list_children,
 253     GDB_XML_EF_NONE, library_list_start_list, NULL },
 254   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 255 };
 256
 257 /* Parse LIBRARY, a string containing the loader info in XML format,
 258    and return an lm_info_p vector.
 259
 260    Return NULL if the parsing failed.  */
 261
 262 static VEC (lm_info_p) *
 263 solib_aix_parse_libraries (const char *library)
 264 {
 265   VEC (lm_info_p) *result = NULL;
 266   struct cleanup *back_to = make_cleanup (solib_aix_free_library_list,
 267                                           &result);
 268
 269   if (gdb_xml_parse_quick (_("aix library list"), "library-list-aix.dtd",
 270                            library_list_elements, library, &result) == 0)
 271     {
 272       /* Parsed successfully, keep the result.  */
 273       discard_cleanups (back_to);
 274       return result;
 275     }
 276
 277   do_cleanups (back_to);
 278   return NULL;
 279 }
 280
 281 #endif /* HAVE_LIBEXPAT */
 282
 283 /* Return the loader info for the given inferior (INF), or NULL if
 284    the list could not be computed.
 285
 286    Cache the result in per-inferior data, so as to avoid recomputing it
 287    each time this function is called.
 288
 289    If an error occurs while computing this list, and WARNING_MSG
 290    is not NULL, then print a warning including WARNING_MSG and
 291    a description of the error.  */
 292
 293 static VEC (lm_info_p) *
 294 solib_aix_get_library_list (struct inferior *inf, const char *warning_msg)
 295 {
 296   struct solib_aix_inferior_data *data;
 297   char *library_document;
 298   struct cleanup *cleanup;
 299
 300   /* If already computed, return the cached value.  */
 301   data = get_solib_aix_inferior_data (inf);
 302   if (data->library_list != NULL)
 303     return data->library_list;
 304
 305   library_document = target_read_stralloc (&current_target,
 306                                            TARGET_OBJECT_LIBRARIES_AIX,
 307                                            NULL);
 308   if (library_document == NULL && warning_msg != NULL)
 309     {
 310       warning (_("%s (failed to read TARGET_OBJECT_LIBRARIES_AIX)"),
 311                warning_msg);
 312       return NULL;
 313     }
 314   cleanup = make_cleanup (xfree, library_document);
 315
 316   if (solib_aix_debug)
 317     fprintf_unfiltered (gdb_stdlog,
 318                         "DEBUG: TARGET_OBJECT_LIBRARIES_AIX = \n%s\n",
 319                         library_document);
 320
 321   data->library_list = solib_aix_parse_libraries (library_document);
 322   if (data->library_list == NULL && warning_msg != NULL)
 323     {
 324       warning (_("%s (missing XML support?)"), warning_msg);
 325       do_cleanups (cleanup);
 326       return NULL;
 327     }
 328
 329   do_cleanups (cleanup);
 330   return data->library_list;
 331 }
 332
 333 /* If the .bss section's VMA is set to an address located before
 334    the end of the .data section, causing the two sections to overlap,
 335    return the overlap in bytes.  Otherwise, return zero.
 336
 337    Motivation:
 338
 339    The GNU linker sometimes sets the start address of the .bss session
 340    before the end of the .data section, making the 2 sections overlap.
 341    The loader appears to handle this situation gracefully, by simply
 342    loading the bss section right after the end of the .data section.
 343
 344    This means that the .data and the .bss sections are sometimes
 345    no longer relocated by the same amount.  The problem is that
 346    the ldinfo data does not contain any information regarding
 347    the relocation of the .bss section, assuming that it would be
 348    identical to the information provided for the .data section
 349    (this is what would normally happen if the program was linked
 350    correctly).
 351
 352    GDB therefore needs to detect those cases, and make the corresponding
 353    adjustment to the .bss section offset computed from the ldinfo data
 354    when necessary.  This function returns the adjustment amount  (or
 355    zero when no adjustment is needed).  */
 356
 357 static CORE_ADDR
 358 solib_aix_bss_data_overlap (bfd *abfd)
 359 {
 360   struct bfd_section *data_sect, *bss_sect;
 361
 362   data_sect = bfd_get_section_by_name (abfd, ".data");
 363   if (data_sect == NULL)
 364     return 0; /* No overlap possible.  */
 365
 366   bss_sect = bfd_get_section_by_name (abfd, ".bss");
 367   if (bss_sect == NULL)
 368     return 0; /* No overlap possible.  */
 369
 370   /* Assume the problem only occurs with linkers that place the .bss
 371      section after the .data section (the problem has only been
 372      observed when using the GNU linker, and the default linker
 373      script always places the .data and .bss sections in that order).  */
 374   if (bfd_section_vma (abfd, bss_sect)
 375       < bfd_section_vma (abfd, data_sect))
 376     return 0;
 377
 378   if (bfd_section_vma (abfd, bss_sect)
 379       < bfd_section_vma (abfd, data_sect) + bfd_get_section_size (data_sect))
 380     return ((bfd_section_vma (abfd, data_sect)
 381              + bfd_get_section_size (data_sect))
 382             - bfd_section_vma (abfd, bss_sect));
 383
 384   return 0;
 385 }
 386
 387 /* Implement the "relocate_section_addresses" target_so_ops method.  */
 388
 389 static void
 390 solib_aix_relocate_section_addresses (struct so_list *so,
 391                                       struct target_section *sec)
 392 {
 393   bfd *abfd = sec->bfd;
 394   struct bfd_section *bfd_sect = sec->the_bfd_section;
 395   const char *section_name = bfd_section_name (abfd, bfd_sect);
 396   struct lm_info *info = so->lm_info;
 397
 398   if (strcmp (section_name, ".text") == 0)
 399     {
 400       sec->addr = info->text_addr;
 401       sec->endaddr = sec->addr + info->text_size;
 402
 403       /* The text address given to us by the loader contains
 404          XCOFF headers, so we need to adjust by this much.  */
 405       sec->addr += bfd_sect->filepos;
 406     }
 407   else if (strcmp (section_name, ".data") == 0)
 408     {
 409       sec->addr = info->data_addr;
 410       sec->endaddr = sec->addr + info->data_size;
 411     }
 412   else if (strcmp (section_name, ".bss") == 0)
 413     {
 414       sec->addr = bfd_section_vma (abfd, bfd_sect) + info->data_addr;
 415       sec->addr += solib_aix_bss_data_overlap (abfd);
 416       sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect);
 417     }
 418   else
 419     {
 420       /* All other sections should not be relocated.  */
 421       /* FIXME: GDB complains that the .loader section sometimes
 422          overlaps with other sections (Eg: the .data section).
 423          As far as I can tell, the loader section had the LOAD flag
 424          set, but not the RELOC.  So it should not be relocated.
 425          There seems to be a problem there, and maybe it has to do
 426          with setting sec->addr to 0 (when the vma is indeed 0).
 427          But even if there wasn't, the problem then becomes the fact
 428          that many shared objects inside shared libraries have
 429          a .loader section whose vma is 0, thus also triggering
 430          an overlap warning.  */
 431       sec->addr = bfd_section_vma (abfd, bfd_sect);
 432       sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect);
 433     }
 434 }
 435
 436 /* Implement the "free_so" target_so_ops method.  */
 437
 438 static void
 439 solib_aix_free_so (struct so_list *so)
 440 {
 441   if (solib_aix_debug)
 442     fprintf_unfiltered (gdb_stdlog, "DEBUG: solib_aix_free_so (%s)\n",
 443                         so->so_name);
 444   solib_aix_xfree_lm_info (so->lm_info);
 445 }
 446
 447 /* Implement the "clear_solib" target_so_ops method.  */
 448
 449 static void
 450 solib_aix_clear_solib (void)
 451 {
 452   /* Nothing needed.  */
 453 }
 454
 455 /* Compute and return the OBJFILE's section_offset array, using
 456    the associated loader info (INFO).
 457
 458    The resulting array is computed on the heap and must be
 459    deallocated after use.  */
 460
 461 static struct section_offsets *
 462 solib_aix_get_section_offsets (struct objfile *objfile,
 463                                struct lm_info *info)
 464 {
 465   struct section_offsets *offsets;
 466   bfd *abfd = objfile->obfd;
 467   int i;
 468
 469   offsets = XCALLOC (objfile->num_sections, struct section_offsets);
 470
 471   /* .text */
 472
 473   if (objfile->sect_index_text != -1)
 474     {
 475       struct bfd_section *sect
 476         = objfile->sections[objfile->sect_index_text].the_bfd_section;
 477
 478       offsets->offsets[objfile->sect_index_text]
 479         = info->text_addr + sect->filepos - bfd_section_vma (abfd, sect);
 480     }
 481
 482   /* .data */
 483
 484   if (objfile->sect_index_data != -1)
 485     {
 486       struct bfd_section *sect
 487         = objfile->sections[objfile->sect_index_data].the_bfd_section;
 488
 489       offsets->offsets[objfile->sect_index_data]
 490         = info->data_addr - bfd_section_vma (abfd, sect);
 491     }
 492
 493   /* .bss
 494
 495      The offset of the .bss section should be identical to the offset
 496      of the .data section.  If no .data section (which seems hard to
 497      believe it is possible), assume it is zero.  */
 498
 499   if (objfile->sect_index_bss != -1
 500       && objfile->sect_index_data != -1)
 501     {
 502       offsets->offsets[objfile->sect_index_bss]
 503         = (offsets->offsets[objfile->sect_index_data]
 504            + solib_aix_bss_data_overlap (abfd));
 505     }
 506
 507   /* All other sections should not need relocation.  */
 508
 509   return offsets;
 510 }
 511
 512 /* Implement the "solib_create_inferior_hook" target_so_ops method.  */
 513
 514 static void
 515 solib_aix_solib_create_inferior_hook (int from_tty)
 516 {
 517   const char *warning_msg = "unable to relocate main executable";
 518   VEC (lm_info_p) *library_list;
 519   struct lm_info *exec_info;
 520
 521   /* We need to relocate the main executable...  */
 522
 523   library_list = solib_aix_get_library_list (current_inferior (),
 524                                              warning_msg);
 525   if (library_list == NULL)
 526     return;  /* Warning already printed.  */
 527
 528   if (VEC_length (lm_info_p, library_list) < 1)
 529     {
 530       warning (_("unable to relocate main executable (no info from loader)"));
 531       return;
 532     }
 533
 534   exec_info = VEC_index (lm_info_p, library_list, 0);
 535
 536   if (symfile_objfile != NULL)
 537     {
 538       struct section_offsets *offsets
 539         = solib_aix_get_section_offsets (symfile_objfile, exec_info);
 540       struct cleanup *cleanup = make_cleanup (xfree, offsets);
 541
 542       objfile_relocate (symfile_objfile, offsets);
 543       do_cleanups (cleanup);
 544     }
 545 }
 546
 547 /* Implement the "special_symbol_handling" target_so_ops method.  */
 548
 549 static void
 550 solib_aix_special_symbol_handling (void)
 551 {
 552   /* Nothing needed.  */
 553 }
 554
 555 /* Implement the "current_sos" target_so_ops method.  */
 556
 557 static struct so_list *
 558 solib_aix_current_sos (void)
 559 {
 560   struct so_list *start = NULL, *last = NULL;
 561   VEC (lm_info_p) *library_list;
 562   struct lm_info *info;
 563   int ix;
 564
 565   library_list = solib_aix_get_library_list (current_inferior (), NULL);
 566   if (library_list == NULL)
 567     return NULL;
 568
 569   /* Build a struct so_list for each entry on the list.
 570      We skip the first entry, since this is the entry corresponding
 571      to the main executable, not a shared library.  */
 572   for (ix = 1; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
 573     {
 574       struct so_list *new_solib = XZALLOC (struct so_list);
 575       char *so_name;
 576
 577       if (info->member_name == NULL)
 578         {
 579          /* INFO->FILENAME is probably not an archive, but rather
 580             a shared object.  Unusual, but it should be possible
 581             to link a program against a shared object directory,
 582             without having to put it in an archive first.  */
 583          so_name = xstrdup (info->filename);
 584         }
 585       else
 586         {
 587          /* This is the usual case on AIX, where the shared object
 588             is a member of an archive.  Create a synthetic so_name
 589             that follows the same convention as AIX's ldd tool
 590             (Eg: "/lib/libc.a(shr.o)").  */
 591          so_name = xstrprintf ("%s(%s)", info->filename, info->member_name);
 592         }
 593       strncpy (new_solib->so_original_name, so_name,
 594                SO_NAME_MAX_PATH_SIZE - 1);
 595       new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
 596       memcpy (new_solib->so_name, new_solib->so_original_name,
 597               SO_NAME_MAX_PATH_SIZE);
 598       new_solib->lm_info = solib_aix_new_lm_info (info);
 599
 600       /* Add it to the list.  */
 601       if (!start)
 602         last = start = new_solib;
 603       else
 604         {
 605           last->next = new_solib;
 606           last = new_solib;
 607         }
 608     }
 609
 610   return start;
 611 }
 612
 613 /* Implement the "open_symbol_file_object" target_so_ops method.  */
 614
 615 static int
 616 solib_aix_open_symbol_file_object (void *from_ttyp)
 617 {
 618   return 0;
 619 }
 620
 621 /* Implement the "in_dynsym_resolve_code" target_so_ops method.  */
 622
 623 static int
 624 solib_aix_in_dynsym_resolve_code (CORE_ADDR pc)
 625 {
 626   return 0;
 627 }
 628
 629 /* Implement the "bfd_open" target_so_ops method.  */
 630
 631 static bfd *
 632 solib_aix_bfd_open (char *pathname)
 633 {
 634   /* The pathname is actually a synthetic filename with the following
 635      form: "/path/to/sharedlib(member.o)" (double-quotes excluded).
 636      split this into archive name and member name.
 637
 638      FIXME: This is a little hacky.  Perhaps we should provide access
 639      to the solib's lm_info here?  */
 640   const int path_len = strlen (pathname);
 641   char *sep;
 642   char *filename;
 643   int filename_len;
 644   char *member_name;
 645   bfd *archive_bfd, *object_bfd;
 646   struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);
 647
 648   if (pathname[path_len - 1] != ')')
 649     return solib_bfd_open (pathname);
 650
 651   /* Search for the associated parens.  */
 652   sep = strrchr (pathname, '(');
 653   if (sep == NULL)
 654     {
 655       /* Should never happen, but recover as best as we can (trying
 656          to open pathname without decoding, possibly leading to
 657          a failure), rather than triggering an assert failure).  */
 658       warning (_("missing '(' in shared object pathname: %s"), pathname);
 659       return solib_bfd_open (pathname);
 660     }
 661   filename_len = sep - pathname;
 662
 663   filename = xstrprintf ("%.*s", filename_len, pathname);
 664   make_cleanup (xfree, filename);
 665   member_name = xstrprintf ("%.*s", path_len - filename_len - 2, sep + 1);
 666   make_cleanup (xfree, member_name);
 667
 668   archive_bfd = gdb_bfd_open (filename, gnutarget, -1);
 669   if (archive_bfd == NULL)
 670     {
 671       warning (_("Could not open `%s' as an executable file: %s"),
 672                filename, bfd_errmsg (bfd_get_error ()));
 673       do_cleanups (cleanup);
 674       return NULL;
 675     }
 676
 677   if (bfd_check_format (archive_bfd, bfd_object))
 678     {
 679       do_cleanups (cleanup);
 680       return archive_bfd;
 681     }
 682
 683   if (! bfd_check_format (archive_bfd, bfd_archive))
 684     {
 685       warning (_("\"%s\": not in executable format: %s."),
 686                filename, bfd_errmsg (bfd_get_error ()));
 687       gdb_bfd_unref (archive_bfd);
 688       do_cleanups (cleanup);
 689       return NULL;
 690     }
 691
 692   object_bfd = gdb_bfd_openr_next_archived_file (archive_bfd, NULL);
 693   while (object_bfd != NULL)
 694     {
 695       bfd *next;
 696
 697       if (strcmp (member_name, object_bfd->filename) == 0)
 698         break;
 699
 700       next = gdb_bfd_openr_next_archived_file (archive_bfd, object_bfd);
 701       gdb_bfd_unref (object_bfd);
 702       object_bfd = next;
 703     }
 704
 705   if (object_bfd == NULL)
 706     {
 707       warning (_("\"%s\": member \"%s\" missing."), filename, member_name);
 708       gdb_bfd_unref (archive_bfd);
 709       do_cleanups (cleanup);
 710       return NULL;
 711     }
 712
 713   if (! bfd_check_format (object_bfd, bfd_object))
 714     {
 715       warning (_("%s(%s): not in object format: %s."),
 716                filename, member_name, bfd_errmsg (bfd_get_error ()));
 717       gdb_bfd_unref (archive_bfd);
 718       gdb_bfd_unref (object_bfd);
 719       do_cleanups (cleanup);
 720       return NULL;
 721     }
 722
 723   gdb_bfd_unref (archive_bfd);
 724   do_cleanups (cleanup);
 725   return object_bfd;
 726 }
 727
 728 /* Return the obj_section corresponding to OBJFILE's data section,
 729    or NULL if not found.  */
 730 /* FIXME: Define in a more general location? */
 731
 732 static struct obj_section *
 733 data_obj_section_from_objfile (struct objfile *objfile)
 734 {
 735   struct obj_section *osect;
 736
 737   ALL_OBJFILE_OSECTIONS (objfile, osect)
 738     if (strcmp (bfd_section_name (objfile->obfd, osect->the_bfd_section),
 739                 ".data") == 0)
 740       return osect;
 741
 742   return NULL;
 743 }
 744
 745 /* Return the TOC value corresponding to the given PC address,
 746    or raise an error if the value could not be determined.  */
 747
 748 CORE_ADDR
 749 solib_aix_get_toc_value (CORE_ADDR pc)
 750 {
 751   struct obj_section *pc_osect = find_pc_section (pc);
 752   struct obj_section *data_osect;
 753   CORE_ADDR result;
 754
 755   if (pc_osect == NULL)
 756     error (_("unable to find TOC entry for pc %s "
 757              "(no section contains this PC)"),
 758            core_addr_to_string (pc));
 759
 760   data_osect = data_obj_section_from_objfile (pc_osect->objfile);
 761   if (data_osect == NULL)
 762     error (_("unable to find TOC entry for pc %s "
 763              "(%s has no data section)"),
 764            core_addr_to_string (pc), pc_osect->objfile->name);
 765
 766   result = (obj_section_addr (data_osect)
 767             + xcoff_get_toc_offset (pc_osect->objfile));
 768   if (solib_aix_debug)
 769     fprintf_unfiltered (gdb_stdlog,
 770                         "DEBUG: solib_aix_get_toc_value (pc=%s) -> %s\n",
 771                         core_addr_to_string (pc),
 772                         core_addr_to_string (result));
 773
 774   return result;
 775 }
 776
 777 /* This module's normal_stop observer.  */
 778
 779 static void
 780 solib_aix_normal_stop_observer (struct bpstats *unused_1, int unused_2)
 781 {
 782   struct solib_aix_inferior_data *data
 783     = get_solib_aix_inferior_data (current_inferior ());
 784
 785   /* The inferior execution has been resumed, and it just stopped
 786      again.  This means that the list of shared libraries may have
 787      evolved.  Reset our cached value.  */
 788   solib_aix_free_library_list (&data->library_list);
 789 }
 790
 791 /* Implements the "show debug aix-solib" command.  */
 792
 793 static void
 794 show_solib_aix_debug (struct ui_file *file, int from_tty,
 795                       struct cmd_list_element *c, const char *value)
 796 {
 797   fprintf_filtered (file, _("solib-aix debugging is %s.\n"), value);
 798 }
 799
 800 /* The target_so_ops for AIX targets.  */
 801 struct target_so_ops solib_aix_so_ops;
 802
 803 /* -Wmissing-prototypes */
 804 extern initialize_file_ftype _initialize_solib_aix;
 805
 806 void
 807 _initialize_solib_aix (void)
 808 {
 809   solib_aix_so_ops.relocate_section_addresses
 810     = solib_aix_relocate_section_addresses;
 811   solib_aix_so_ops.free_so = solib_aix_free_so;
 812   solib_aix_so_ops.clear_solib = solib_aix_clear_solib;
 813   solib_aix_so_ops.solib_create_inferior_hook
 814     = solib_aix_solib_create_inferior_hook;
 815   solib_aix_so_ops.special_symbol_handling
 816     = solib_aix_special_symbol_handling;
 817   solib_aix_so_ops.current_sos = solib_aix_current_sos;
 818   solib_aix_so_ops.open_symbol_file_object
 819     = solib_aix_open_symbol_file_object;
 820   solib_aix_so_ops.in_dynsym_resolve_code
 821     = solib_aix_in_dynsym_resolve_code;
 822   solib_aix_so_ops.bfd_open = solib_aix_bfd_open;
 823
 824   solib_aix_inferior_data_handle = register_inferior_data ();
 825
 826   observer_attach_normal_stop (solib_aix_normal_stop_observer);
 827
 828   /* Debug this file's internals.  */
 829   add_setshow_boolean_cmd ("aix-solib", class_maintenance,
 830                            &solib_aix_debug, _("\
 831 Control the debugging traces for the solib-aix module."), _("\
 832 Show whether solib-aix debugging traces are enabled."), _("\
 833 When on, solib-aix debugging traces are enabled."),
 834                             NULL,
 835                             show_solib_aix_debug,
 836                             &setdebuglist, &showdebuglist);
 837 }