| /* Definitions for targets which report shared library events. |
| |
| Copyright (C) 2007-2012 Free Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #include "defs.h" |
| #include "objfiles.h" |
| #include "solist.h" |
| #include "symtab.h" |
| #include "symfile.h" |
| #include "target.h" |
| #include "vec.h" |
| #include "solib-target.h" |
| |
| #include "gdb_string.h" |
| |
| /* Private data for each loaded library. */ |
| struct lm_info |
| { |
| /* The library's name. The name is normally kept in the struct |
| so_list; it is only here during XML parsing. */ |
| char *name; |
| |
| /* The target can either specify segment bases or section bases, not |
| both. */ |
| |
| /* The base addresses for each independently relocatable segment of |
| this shared library. */ |
| VEC(CORE_ADDR) *segment_bases; |
| |
| /* The base addresses for each independently allocatable, |
| relocatable section of this shared library. */ |
| VEC(CORE_ADDR) *section_bases; |
| |
| /* The cached offsets for each section of this shared library, |
| determined from SEGMENT_BASES, or SECTION_BASES. */ |
| struct section_offsets *offsets; |
| }; |
| |
| typedef struct lm_info *lm_info_p; |
| DEF_VEC_P(lm_info_p); |
| |
| #if !defined(HAVE_LIBEXPAT) |
| |
| static VEC(lm_info_p) * |
| solib_target_parse_libraries (const char *library) |
| { |
| static int have_warned; |
| |
| if (!have_warned) |
| { |
| have_warned = 1; |
| warning (_("Can not parse XML library list; XML support was disabled " |
| "at compile time")); |
| } |
| |
| return NULL; |
| } |
| |
| #else /* HAVE_LIBEXPAT */ |
| |
| #include "xml-support.h" |
| |
| /* Handle the start of a <segment> element. */ |
| |
| static void |
| library_list_start_segment (struct gdb_xml_parser *parser, |
| const struct gdb_xml_element *element, |
| void *user_data, VEC(gdb_xml_value_s) *attributes) |
| { |
| VEC(lm_info_p) **list = user_data; |
| struct lm_info *last = VEC_last (lm_info_p, *list); |
| ULONGEST *address_p = xml_find_attribute (attributes, "address")->value; |
| CORE_ADDR address = (CORE_ADDR) *address_p; |
| |
| if (last->section_bases != NULL) |
| gdb_xml_error (parser, |
| _("Library list with both segments and sections")); |
| |
| VEC_safe_push (CORE_ADDR, last->segment_bases, address); |
| } |
| |
| static void |
| library_list_start_section (struct gdb_xml_parser *parser, |
| const struct gdb_xml_element *element, |
| void *user_data, VEC(gdb_xml_value_s) *attributes) |
| { |
| VEC(lm_info_p) **list = user_data; |
| struct lm_info *last = VEC_last (lm_info_p, *list); |
| ULONGEST *address_p = xml_find_attribute (attributes, "address")->value; |
| CORE_ADDR address = (CORE_ADDR) *address_p; |
| |
| if (last->segment_bases != NULL) |
| gdb_xml_error (parser, |
| _("Library list with both segments and sections")); |
| |
| VEC_safe_push (CORE_ADDR, last->section_bases, address); |
| } |
| |
| /* Handle the start of a <library> element. */ |
| |
| static void |
| library_list_start_library (struct gdb_xml_parser *parser, |
| const struct gdb_xml_element *element, |
| void *user_data, VEC(gdb_xml_value_s) *attributes) |
| { |
| VEC(lm_info_p) **list = user_data; |
| struct lm_info *item = XZALLOC (struct lm_info); |
| const char *name = xml_find_attribute (attributes, "name")->value; |
| |
| item->name = xstrdup (name); |
| VEC_safe_push (lm_info_p, *list, item); |
| } |
| |
| static void |
| library_list_end_library (struct gdb_xml_parser *parser, |
| const struct gdb_xml_element *element, |
| void *user_data, const char *body_text) |
| { |
| VEC(lm_info_p) **list = user_data; |
| struct lm_info *lm_info = VEC_last (lm_info_p, *list); |
| |
| if (lm_info->segment_bases == NULL |
| && lm_info->section_bases == NULL) |
| gdb_xml_error (parser, |
| _("No segment or section bases defined")); |
| } |
| |
| |
| /* Handle the start of a <library-list> element. */ |
| |
| static void |
| library_list_start_list (struct gdb_xml_parser *parser, |
| const struct gdb_xml_element *element, |
| void *user_data, VEC(gdb_xml_value_s) *attributes) |
| { |
| char *version = xml_find_attribute (attributes, "version")->value; |
| |
| if (strcmp (version, "1.0") != 0) |
| gdb_xml_error (parser, |
| _("Library list has unsupported version \"%s\""), |
| version); |
| } |
| |
| /* Discard the constructed library list. */ |
| |
| static void |
| solib_target_free_library_list (void *p) |
| { |
| VEC(lm_info_p) **result = p; |
| struct lm_info *info; |
| int ix; |
| |
| for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++) |
| { |
| xfree (info->name); |
| VEC_free (CORE_ADDR, info->segment_bases); |
| VEC_free (CORE_ADDR, info->section_bases); |
| xfree (info); |
| } |
| VEC_free (lm_info_p, *result); |
| *result = NULL; |
| } |
| |
| /* The allowed elements and attributes for an XML library list. |
| The root element is a <library-list>. */ |
| |
| static const struct gdb_xml_attribute segment_attributes[] = { |
| { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_attribute section_attributes[] = { |
| { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL }, |
| { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_element library_children[] = { |
| { "segment", segment_attributes, NULL, |
| GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| library_list_start_segment, NULL }, |
| { "section", section_attributes, NULL, |
| GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| library_list_start_section, NULL }, |
| { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_attribute library_attributes[] = { |
| { "name", GDB_XML_AF_NONE, NULL, NULL }, |
| { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_element library_list_children[] = { |
| { "library", library_attributes, library_children, |
| GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL, |
| library_list_start_library, library_list_end_library }, |
| { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_attribute library_list_attributes[] = { |
| { "version", GDB_XML_AF_NONE, NULL, NULL }, |
| { NULL, GDB_XML_AF_NONE, NULL, NULL } |
| }; |
| |
| static const struct gdb_xml_element library_list_elements[] = { |
| { "library-list", library_list_attributes, library_list_children, |
| GDB_XML_EF_NONE, library_list_start_list, NULL }, |
| { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } |
| }; |
| |
| static VEC(lm_info_p) * |
| solib_target_parse_libraries (const char *library) |
| { |
| VEC(lm_info_p) *result = NULL; |
| struct cleanup *back_to = make_cleanup (solib_target_free_library_list, |
| &result); |
| |
| if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd", |
| library_list_elements, library, &result) == 0) |
| { |
| /* Parsed successfully, keep the result. */ |
| discard_cleanups (back_to); |
| return result; |
| } |
| |
| do_cleanups (back_to); |
| return NULL; |
| } |
| #endif |
| |
| static struct so_list * |
| solib_target_current_sos (void) |
| { |
| struct so_list *new_solib, *start = NULL, *last = NULL; |
| const char *library_document; |
| VEC(lm_info_p) *library_list; |
| struct lm_info *info; |
| int ix; |
| |
| /* Fetch the list of shared libraries. */ |
| library_document = target_read_stralloc (¤t_target, |
| TARGET_OBJECT_LIBRARIES, |
| NULL); |
| if (library_document == NULL) |
| return NULL; |
| |
| /* Parse the list. */ |
| library_list = solib_target_parse_libraries (library_document); |
| if (library_list == NULL) |
| return NULL; |
| |
| /* Build a struct so_list for each entry on the list. */ |
| for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++) |
| { |
| new_solib = XZALLOC (struct so_list); |
| strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1); |
| new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| strncpy (new_solib->so_original_name, info->name, |
| SO_NAME_MAX_PATH_SIZE - 1); |
| new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0'; |
| new_solib->lm_info = info; |
| |
| /* We no longer need this copy of the name. */ |
| xfree (info->name); |
| info->name = NULL; |
| |
| /* Add it to the list. */ |
| if (!start) |
| last = start = new_solib; |
| else |
| { |
| last->next = new_solib; |
| last = new_solib; |
| } |
| } |
| |
| /* Free the library list, but not its members. */ |
| VEC_free (lm_info_p, library_list); |
| |
| return start; |
| } |
| |
| static void |
| solib_target_special_symbol_handling (void) |
| { |
| /* Nothing needed. */ |
| } |
| |
| static void |
| solib_target_solib_create_inferior_hook (int from_tty) |
| { |
| /* Nothing needed. */ |
| } |
| |
| static void |
| solib_target_clear_solib (void) |
| { |
| /* Nothing needed. */ |
| } |
| |
| static void |
| solib_target_free_so (struct so_list *so) |
| { |
| gdb_assert (so->lm_info->name == NULL); |
| xfree (so->lm_info->offsets); |
| VEC_free (CORE_ADDR, so->lm_info->segment_bases); |
| xfree (so->lm_info); |
| } |
| |
| static void |
| solib_target_relocate_section_addresses (struct so_list *so, |
| struct target_section *sec) |
| { |
| int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section); |
| CORE_ADDR offset; |
| |
| /* Build the offset table only once per object file. We can not do |
| it any earlier, since we need to open the file first. */ |
| if (so->lm_info->offsets == NULL) |
| { |
| int num_sections = bfd_count_sections (so->abfd); |
| |
| so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)); |
| |
| if (so->lm_info->section_bases) |
| { |
| int i; |
| asection *sect; |
| int num_section_bases |
| = VEC_length (CORE_ADDR, so->lm_info->section_bases); |
| int num_alloc_sections = 0; |
| |
| for (i = 0, sect = so->abfd->sections; |
| sect != NULL; |
| i++, sect = sect->next) |
| if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC)) |
| num_alloc_sections++; |
| |
| if (num_alloc_sections != num_section_bases) |
| warning (_("\ |
| Could not relocate shared library \"%s\": wrong number of ALLOC sections"), |
| so->so_name); |
| else |
| { |
| int bases_index = 0; |
| int found_range = 0; |
| CORE_ADDR *section_bases; |
| |
| section_bases = VEC_address (CORE_ADDR, |
| so->lm_info->section_bases); |
| |
| so->addr_low = ~(CORE_ADDR) 0; |
| so->addr_high = 0; |
| for (i = 0, sect = so->abfd->sections; |
| sect != NULL; |
| i++, sect = sect->next) |
| { |
| if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC)) |
| continue; |
| if (bfd_section_size (so->abfd, sect) > 0) |
| { |
| CORE_ADDR low, high; |
| |
| low = section_bases[i]; |
| high = low + bfd_section_size (so->abfd, sect) - 1; |
| |
| if (low < so->addr_low) |
| so->addr_low = low; |
| if (high > so->addr_high) |
| so->addr_high = high; |
| gdb_assert (so->addr_low <= so->addr_high); |
| found_range = 1; |
| } |
| so->lm_info->offsets->offsets[i] |
| = section_bases[bases_index]; |
| bases_index++; |
| } |
| if (!found_range) |
| so->addr_low = so->addr_high = 0; |
| gdb_assert (so->addr_low <= so->addr_high); |
| } |
| } |
| else if (so->lm_info->segment_bases) |
| { |
| struct symfile_segment_data *data; |
| |
| data = get_symfile_segment_data (so->abfd); |
| if (data == NULL) |
| warning (_("\ |
| Could not relocate shared library \"%s\": no segments"), so->so_name); |
| else |
| { |
| ULONGEST orig_delta; |
| int i; |
| int num_bases; |
| CORE_ADDR *segment_bases; |
| |
| num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases); |
| segment_bases = VEC_address (CORE_ADDR, |
| so->lm_info->segment_bases); |
| |
| if (!symfile_map_offsets_to_segments (so->abfd, data, |
| so->lm_info->offsets, |
| num_bases, segment_bases)) |
| warning (_("\ |
| Could not relocate shared library \"%s\": bad offsets"), so->so_name); |
| |
| /* Find the range of addresses to report for this library in |
| "info sharedlibrary". Report any consecutive segments |
| which were relocated as a single unit. */ |
| gdb_assert (num_bases > 0); |
| orig_delta = segment_bases[0] - data->segment_bases[0]; |
| |
| for (i = 1; i < data->num_segments; i++) |
| { |
| /* If we have run out of offsets, assume all |
| remaining segments have the same offset. */ |
| if (i >= num_bases) |
| continue; |
| |
| /* If this segment does not have the same offset, do |
| not include it in the library's range. */ |
| if (segment_bases[i] - data->segment_bases[i] != orig_delta) |
| break; |
| } |
| |
| so->addr_low = segment_bases[0]; |
| so->addr_high = (data->segment_bases[i - 1] |
| + data->segment_sizes[i - 1] |
| + orig_delta); |
| gdb_assert (so->addr_low <= so->addr_high); |
| |
| free_symfile_segment_data (data); |
| } |
| } |
| } |
| |
| offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index]; |
| sec->addr += offset; |
| sec->endaddr += offset; |
| } |
| |
| static int |
| solib_target_open_symbol_file_object (void *from_ttyp) |
| { |
| /* We can't locate the main symbol file based on the target's |
| knowledge; the user has to specify it. */ |
| return 0; |
| } |
| |
| static int |
| solib_target_in_dynsym_resolve_code (CORE_ADDR pc) |
| { |
| /* We don't have a range of addresses for the dynamic linker; there |
| may not be one in the program's address space. So only report |
| PLT entries (which may be import stubs). */ |
| return in_plt_section (pc, NULL); |
| } |
| |
| struct target_so_ops solib_target_so_ops; |
| |
| /* -Wmissing-prototypes */ |
| extern initialize_file_ftype _initialize_solib_target; |
| |
| void |
| _initialize_solib_target (void) |
| { |
| solib_target_so_ops.relocate_section_addresses |
| = solib_target_relocate_section_addresses; |
| solib_target_so_ops.free_so = solib_target_free_so; |
| solib_target_so_ops.clear_solib = solib_target_clear_solib; |
| solib_target_so_ops.solib_create_inferior_hook |
| = solib_target_solib_create_inferior_hook; |
| solib_target_so_ops.special_symbol_handling |
| = solib_target_special_symbol_handling; |
| solib_target_so_ops.current_sos = solib_target_current_sos; |
| solib_target_so_ops.open_symbol_file_object |
| = solib_target_open_symbol_file_object; |
| solib_target_so_ops.in_dynsym_resolve_code |
| = solib_target_in_dynsym_resolve_code; |
| solib_target_so_ops.bfd_open = solib_bfd_open; |
| |
| /* Set current_target_so_ops to solib_target_so_ops if not already |
| set. */ |
| if (current_target_so_ops == 0) |
| current_target_so_ops = &solib_target_so_ops; |
| } |