gdb/solib-aix.c

   1 /* Copyright (C) 2013-2015 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 = XCNEW (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 = XCNEW (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   struct bfd_section *bfd_sect = sec->the_bfd_section;
 394   bfd *abfd = bfd_sect->owner;
 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       /* The information provided by the loader does not include
 415          the address of the .bss section, but we know that it gets
 416          relocated by the same offset as the .data section.  So,
 417          compute the relocation offset for the .data section, and
 418          apply it to the .bss section as well.  If the .data section
 419          is not defined (which seems highly unlikely), do our best
 420          by assuming no relocation.  */
 421       struct bfd_section *data_sect
 422         = bfd_get_section_by_name (abfd, ".data");
 423       CORE_ADDR data_offset = 0;
 424
 425       if (data_sect != NULL)
 426         data_offset = info->data_addr - bfd_section_vma (abfd, data_sect);
 427
 428       sec->addr = bfd_section_vma (abfd, bfd_sect) + data_offset;
 429       sec->addr += solib_aix_bss_data_overlap (abfd);
 430       sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect);
 431     }
 432   else
 433     {
 434       /* All other sections should not be relocated.  */
 435       sec->addr = bfd_section_vma (abfd, bfd_sect);
 436       sec->endaddr = sec->addr + bfd_section_size (abfd, bfd_sect);
 437     }
 438 }
 439
 440 /* Implement the "free_so" target_so_ops method.  */
 441
 442 static void
 443 solib_aix_free_so (struct so_list *so)
 444 {
 445   if (solib_aix_debug)
 446     fprintf_unfiltered (gdb_stdlog, "DEBUG: solib_aix_free_so (%s)\n",
 447                         so->so_name);
 448   solib_aix_xfree_lm_info (so->lm_info);
 449 }
 450
 451 /* Implement the "clear_solib" target_so_ops method.  */
 452
 453 static void
 454 solib_aix_clear_solib (void)
 455 {
 456   /* Nothing needed.  */
 457 }
 458
 459 /* Compute and return the OBJFILE's section_offset array, using
 460    the associated loader info (INFO).
 461
 462    The resulting array is computed on the heap and must be
 463    deallocated after use.  */
 464
 465 static struct section_offsets *
 466 solib_aix_get_section_offsets (struct objfile *objfile,
 467                                struct lm_info *info)
 468 {
 469   struct section_offsets *offsets;
 470   bfd *abfd = objfile->obfd;
 471   int i;
 472
 473   offsets = XCNEWVEC (struct section_offsets, objfile->num_sections);
 474
 475   /* .text */
 476
 477   if (objfile->sect_index_text != -1)
 478     {
 479       struct bfd_section *sect
 480         = objfile->sections[objfile->sect_index_text].the_bfd_section;
 481
 482       offsets->offsets[objfile->sect_index_text]
 483         = info->text_addr + sect->filepos - bfd_section_vma (abfd, sect);
 484     }
 485
 486   /* .data */
 487
 488   if (objfile->sect_index_data != -1)
 489     {
 490       struct bfd_section *sect
 491         = objfile->sections[objfile->sect_index_data].the_bfd_section;
 492
 493       offsets->offsets[objfile->sect_index_data]
 494         = info->data_addr - bfd_section_vma (abfd, sect);
 495     }
 496
 497   /* .bss
 498
 499      The offset of the .bss section should be identical to the offset
 500      of the .data section.  If no .data section (which seems hard to
 501      believe it is possible), assume it is zero.  */
 502
 503   if (objfile->sect_index_bss != -1
 504       && objfile->sect_index_data != -1)
 505     {
 506       offsets->offsets[objfile->sect_index_bss]
 507         = (offsets->offsets[objfile->sect_index_data]
 508            + solib_aix_bss_data_overlap (abfd));
 509     }
 510
 511   /* All other sections should not need relocation.  */
 512
 513   return offsets;
 514 }
 515
 516 /* Implement the "solib_create_inferior_hook" target_so_ops method.  */
 517
 518 static void
 519 solib_aix_solib_create_inferior_hook (int from_tty)
 520 {
 521   const char *warning_msg = "unable to relocate main executable";
 522   VEC (lm_info_p) *library_list;
 523   struct lm_info *exec_info;
 524
 525   /* We need to relocate the main executable...  */
 526
 527   library_list = solib_aix_get_library_list (current_inferior (),
 528                                              warning_msg);
 529   if (library_list == NULL)
 530     return;  /* Warning already printed.  */
 531
 532   if (VEC_length (lm_info_p, library_list) < 1)
 533     {
 534       warning (_("unable to relocate main executable (no info from loader)"));
 535       return;
 536     }
 537
 538   exec_info = VEC_index (lm_info_p, library_list, 0);
 539
 540   if (symfile_objfile != NULL)
 541     {
 542       struct section_offsets *offsets
 543         = solib_aix_get_section_offsets (symfile_objfile, exec_info);
 544       struct cleanup *cleanup = make_cleanup (xfree, offsets);
 545
 546       objfile_relocate (symfile_objfile, offsets);
 547       do_cleanups (cleanup);
 548     }
 549 }
 550
 551 /* Implement the "special_symbol_handling" target_so_ops method.  */
 552
 553 static void
 554 solib_aix_special_symbol_handling (void)
 555 {
 556   /* Nothing needed.  */
 557 }
 558
 559 /* Implement the "current_sos" target_so_ops method.  */
 560
 561 static struct so_list *
 562 solib_aix_current_sos (void)
 563 {
 564   struct so_list *start = NULL, *last = NULL;
 565   VEC (lm_info_p) *library_list;
 566   struct lm_info *info;
 567   int ix;
 568
 569   library_list = solib_aix_get_library_list (current_inferior (), NULL);
 570   if (library_list == NULL)
 571     return NULL;
 572
 573   /* Build a struct so_list for each entry on the list.
 574      We skip the first entry, since this is the entry corresponding
 575      to the main executable, not a shared library.  */
 576   for (ix = 1; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
 577     {
 578       struct so_list *new_solib = XCNEW (struct so_list);
 579       char *so_name;
 580
 581       if (info->member_name == NULL)
 582         {
 583          /* INFO->FILENAME is probably not an archive, but rather
 584             a shared object.  Unusual, but it should be possible
 585             to link a program against a shared object directory,
 586             without having to put it in an archive first.  */
 587          so_name = xstrdup (info->filename);
 588         }
 589       else
 590         {
 591          /* This is the usual case on AIX, where the shared object
 592             is a member of an archive.  Create a synthetic so_name
 593             that follows the same convention as AIX's ldd tool
 594             (Eg: "/lib/libc.a(shr.o)").  */
 595          so_name = xstrprintf ("%s(%s)", info->filename, info->member_name);
 596         }
 597       strncpy (new_solib->so_original_name, so_name,
 598                SO_NAME_MAX_PATH_SIZE - 1);
 599       new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
 600       memcpy (new_solib->so_name, new_solib->so_original_name,
 601               SO_NAME_MAX_PATH_SIZE);
 602       new_solib->lm_info = solib_aix_new_lm_info (info);
 603
 604       /* Add it to the list.  */
 605       if (!start)
 606         last = start = new_solib;
 607       else
 608         {
 609           last->next = new_solib;
 610           last = new_solib;
 611         }
 612     }
 613
 614   return start;
 615 }
 616
 617 /* Implement the "open_symbol_file_object" target_so_ops method.  */
 618
 619 static int
 620 solib_aix_open_symbol_file_object (void *from_ttyp)
 621 {
 622   return 0;
 623 }
 624
 625 /* Implement the "in_dynsym_resolve_code" target_so_ops method.  */
 626
 627 static int
 628 solib_aix_in_dynsym_resolve_code (CORE_ADDR pc)
 629 {
 630   return 0;
 631 }
 632
 633 /* Implement the "bfd_open" target_so_ops method.  */
 634
 635 static bfd *
 636 solib_aix_bfd_open (char *pathname)
 637 {
 638   /* The pathname is actually a synthetic filename with the following
 639      form: "/path/to/sharedlib(member.o)" (double-quotes excluded).
 640      split this into archive name and member name.
 641
 642      FIXME: This is a little hacky.  Perhaps we should provide access
 643      to the solib's lm_info here?  */
 644   const int path_len = strlen (pathname);
 645   char *sep;
 646   char *filename;
 647   int filename_len;
 648   char *member_name;
 649   bfd *archive_bfd, *object_bfd;
 650   struct cleanup *cleanup;
 651
 652   if (pathname[path_len - 1] != ')')
 653     return solib_bfd_open (pathname);
 654
 655   /* Search for the associated parens.  */
 656   sep = strrchr (pathname, '(');
 657   if (sep == NULL)
 658     {
 659       /* Should never happen, but recover as best as we can (trying
 660          to open pathname without decoding, possibly leading to
 661          a failure), rather than triggering an assert failure).  */
 662       warning (_("missing '(' in shared object pathname: %s"), pathname);
 663       return solib_bfd_open (pathname);
 664     }
 665   filename_len = sep - pathname;
 666
 667   filename = xstrprintf ("%.*s", filename_len, pathname);
 668   cleanup = make_cleanup (xfree, filename);
 669   member_name = xstrprintf ("%.*s", path_len - filename_len - 2, sep + 1);
 670   make_cleanup (xfree, member_name);
 671
 672   archive_bfd = gdb_bfd_open (filename, gnutarget, -1);
 673   if (archive_bfd == NULL)
 674     {
 675       warning (_("Could not open `%s' as an executable file: %s"),
 676                filename, bfd_errmsg (bfd_get_error ()));
 677       do_cleanups (cleanup);
 678       return NULL;
 679     }
 680
 681   if (bfd_check_format (archive_bfd, bfd_object))
 682     {
 683       do_cleanups (cleanup);
 684       return archive_bfd;
 685     }
 686
 687   if (! bfd_check_format (archive_bfd, bfd_archive))
 688     {
 689       warning (_("\"%s\": not in executable format: %s."),
 690                filename, bfd_errmsg (bfd_get_error ()));
 691       gdb_bfd_unref (archive_bfd);
 692       do_cleanups (cleanup);
 693       return NULL;
 694     }
 695
 696   object_bfd = gdb_bfd_openr_next_archived_file (archive_bfd, NULL);
 697   while (object_bfd != NULL)
 698     {
 699       bfd *next;
 700
 701       if (strcmp (member_name, object_bfd->filename) == 0)
 702         break;
 703
 704       next = gdb_bfd_openr_next_archived_file (archive_bfd, object_bfd);
 705       gdb_bfd_unref (object_bfd);
 706       object_bfd = next;
 707     }
 708
 709   if (object_bfd == NULL)
 710     {
 711       warning (_("\"%s\": member \"%s\" missing."), filename, member_name);
 712       gdb_bfd_unref (archive_bfd);
 713       do_cleanups (cleanup);
 714       return NULL;
 715     }
 716
 717   if (! bfd_check_format (object_bfd, bfd_object))
 718     {
 719       warning (_("%s(%s): not in object format: %s."),
 720                filename, member_name, bfd_errmsg (bfd_get_error ()));
 721       gdb_bfd_unref (archive_bfd);
 722       gdb_bfd_unref (object_bfd);
 723       do_cleanups (cleanup);
 724       return NULL;
 725     }
 726
 727   /* Override the returned bfd's name with our synthetic name in order
 728      to allow commands listing all shared libraries to display that
 729      synthetic name.  Otherwise, we would only be displaying the name
 730      of the archive member object.  */
 731   xfree (bfd_get_filename (object_bfd));
 732   object_bfd->filename = xstrdup (pathname);
 733
 734   gdb_bfd_unref (archive_bfd);
 735   do_cleanups (cleanup);
 736   return object_bfd;
 737 }
 738
 739 /* Return the obj_section corresponding to OBJFILE's data section,
 740    or NULL if not found.  */
 741 /* FIXME: Define in a more general location? */
 742
 743 static struct obj_section *
 744 data_obj_section_from_objfile (struct objfile *objfile)
 745 {
 746   struct obj_section *osect;
 747
 748   ALL_OBJFILE_OSECTIONS (objfile, osect)
 749     if (strcmp (bfd_section_name (objfile->obfd, osect->the_bfd_section),
 750                 ".data") == 0)
 751       return osect;
 752
 753   return NULL;
 754 }
 755
 756 /* Return the TOC value corresponding to the given PC address,
 757    or raise an error if the value could not be determined.  */
 758
 759 CORE_ADDR
 760 solib_aix_get_toc_value (CORE_ADDR pc)
 761 {
 762   struct obj_section *pc_osect = find_pc_section (pc);
 763   struct obj_section *data_osect;
 764   CORE_ADDR result;
 765
 766   if (pc_osect == NULL)
 767     error (_("unable to find TOC entry for pc %s "
 768              "(no section contains this PC)"),
 769            core_addr_to_string (pc));
 770
 771   data_osect = data_obj_section_from_objfile (pc_osect->objfile);
 772   if (data_osect == NULL)
 773     error (_("unable to find TOC entry for pc %s "
 774              "(%s has no data section)"),
 775            core_addr_to_string (pc), objfile_name (pc_osect->objfile));
 776
 777   result = (obj_section_addr (data_osect)
 778             + xcoff_get_toc_offset (pc_osect->objfile));
 779   if (solib_aix_debug)
 780     fprintf_unfiltered (gdb_stdlog,
 781                         "DEBUG: solib_aix_get_toc_value (pc=%s) -> %s\n",
 782                         core_addr_to_string (pc),
 783                         core_addr_to_string (result));
 784
 785   return result;
 786 }
 787
 788 /* This module's normal_stop observer.  */
 789
 790 static void
 791 solib_aix_normal_stop_observer (struct bpstats *unused_1, int unused_2)
 792 {
 793   struct solib_aix_inferior_data *data
 794     = get_solib_aix_inferior_data (current_inferior ());
 795
 796   /* The inferior execution has been resumed, and it just stopped
 797      again.  This means that the list of shared libraries may have
 798      evolved.  Reset our cached value.  */
 799   solib_aix_free_library_list (&data->library_list);
 800 }
 801
 802 /* Implements the "show debug aix-solib" command.  */
 803
 804 static void
 805 show_solib_aix_debug (struct ui_file *file, int from_tty,
 806                       struct cmd_list_element *c, const char *value)
 807 {
 808   fprintf_filtered (file, _("solib-aix debugging is %s.\n"), value);
 809 }
 810
 811 /* The target_so_ops for AIX targets.  */
 812 struct target_so_ops solib_aix_so_ops;
 813
 814 /* -Wmissing-prototypes */
 815 extern initialize_file_ftype _initialize_solib_aix;
 816
 817 void
 818 _initialize_solib_aix (void)
 819 {
 820   solib_aix_so_ops.relocate_section_addresses
 821     = solib_aix_relocate_section_addresses;
 822   solib_aix_so_ops.free_so = solib_aix_free_so;
 823   solib_aix_so_ops.clear_solib = solib_aix_clear_solib;
 824   solib_aix_so_ops.solib_create_inferior_hook
 825     = solib_aix_solib_create_inferior_hook;
 826   solib_aix_so_ops.special_symbol_handling
 827     = solib_aix_special_symbol_handling;
 828   solib_aix_so_ops.current_sos = solib_aix_current_sos;
 829   solib_aix_so_ops.open_symbol_file_object
 830     = solib_aix_open_symbol_file_object;
 831   solib_aix_so_ops.in_dynsym_resolve_code
 832     = solib_aix_in_dynsym_resolve_code;
 833   solib_aix_so_ops.bfd_open = solib_aix_bfd_open;
 834
 835   solib_aix_inferior_data_handle = register_inferior_data ();
 836
 837   observer_attach_normal_stop (solib_aix_normal_stop_observer);
 838
 839   /* Debug this file's internals.  */
 840   add_setshow_boolean_cmd ("aix-solib", class_maintenance,
 841                            &solib_aix_debug, _("\
 842 Control the debugging traces for the solib-aix module."), _("\
 843 Show whether solib-aix debugging traces are enabled."), _("\
 844 When on, solib-aix debugging traces are enabled."),
 845                             NULL,
 846                             show_solib_aix_debug,
 847                             &setdebuglist, &showdebuglist);
 848 }