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- /* Definitions for targets which report shared library events.
- Copyright (C) 2007-2022 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 "solib-target.h"
- #include <vector>
- #include "inferior.h"
- /* Private data for each loaded library. */
- struct lm_info_target : public lm_info_base
- {
- /* The library's name. The name is normally kept in the struct
- so_list; it is only here during XML parsing. */
- std::string 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. */
- std::vector<CORE_ADDR> segment_bases;
- /* The base addresses for each independently allocatable,
- relocatable section of this shared library. */
- std::vector<CORE_ADDR> section_bases;
- /* The cached offsets for each section of this shared library,
- determined from SEGMENT_BASES, or SECTION_BASES. */
- section_offsets offsets;
- };
- typedef std::vector<std::unique_ptr<lm_info_target>> lm_info_vector;
- #if !defined(HAVE_LIBEXPAT)
- static lm_info_vector
- 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 lm_info_vector ();
- }
- #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,
- std::vector<gdb_xml_value> &attributes)
- {
- lm_info_vector *list = (lm_info_vector *) user_data;
- lm_info_target *last = list->back ().get ();
- ULONGEST *address_p
- = (ULONGEST *) xml_find_attribute (attributes, "address")->value.get ();
- CORE_ADDR address = (CORE_ADDR) *address_p;
- if (!last->section_bases.empty ())
- gdb_xml_error (parser,
- _("Library list with both segments and sections"));
- last->segment_bases.push_back (address);
- }
- static void
- library_list_start_section (struct gdb_xml_parser *parser,
- const struct gdb_xml_element *element,
- void *user_data,
- std::vector<gdb_xml_value> &attributes)
- {
- lm_info_vector *list = (lm_info_vector *) user_data;
- lm_info_target *last = list->back ().get ();
- ULONGEST *address_p
- = (ULONGEST *) xml_find_attribute (attributes, "address")->value.get ();
- CORE_ADDR address = (CORE_ADDR) *address_p;
- if (!last->segment_bases.empty ())
- gdb_xml_error (parser,
- _("Library list with both segments and sections"));
- last->section_bases.push_back (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,
- std::vector<gdb_xml_value> &attributes)
- {
- lm_info_vector *list = (lm_info_vector *) user_data;
- lm_info_target *item = new lm_info_target;
- item->name
- = (const char *) xml_find_attribute (attributes, "name")->value.get ();
- list->emplace_back (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)
- {
- lm_info_vector *list = (lm_info_vector *) user_data;
- lm_info_target *lm_info = list->back ().get ();
- if (lm_info->segment_bases.empty () && lm_info->section_bases.empty ())
- 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,
- std::vector<gdb_xml_value> &attributes)
- {
- struct gdb_xml_value *version = xml_find_attribute (attributes, "version");
- /* #FIXED attribute may be omitted, Expat returns NULL in such case. */
- if (version != NULL)
- {
- const char *string = (const char *) version->value.get ();
- if (strcmp (string, "1.0") != 0)
- gdb_xml_error (parser,
- _("Library list has unsupported version \"%s\""),
- string);
- }
- }
- /* 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_OPTIONAL, 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 lm_info_vector
- solib_target_parse_libraries (const char *library)
- {
- lm_info_vector result;
- if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd",
- library_list_elements, library, &result) == 0)
- {
- /* Parsed successfully. */
- return result;
- }
- result.clear ();
- return result;
- }
- #endif
- static struct so_list *
- solib_target_current_sos (void)
- {
- struct so_list *new_solib, *start = NULL, *last = NULL;
- /* Fetch the list of shared libraries. */
- gdb::optional<gdb::char_vector> library_document
- = target_read_stralloc (current_inferior ()->top_target (),
- TARGET_OBJECT_LIBRARIES, NULL);
- if (!library_document)
- return NULL;
- /* Parse the list. */
- lm_info_vector library_list
- = solib_target_parse_libraries (library_document->data ());
- if (library_list.empty ())
- return NULL;
- /* Build a struct so_list for each entry on the list. */
- for (auto &&info : library_list)
- {
- new_solib = XCNEW (struct so_list);
- strncpy (new_solib->so_name, info->name.c_str (),
- 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.c_str (),
- SO_NAME_MAX_PATH_SIZE - 1);
- new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
- /* We no longer need this copy of the name. */
- info->name.clear ();
- new_solib->lm_info = info.release ();
- /* Add it to the list. */
- if (!start)
- last = start = new_solib;
- else
- {
- last->next = new_solib;
- last = new_solib;
- }
- }
- return start;
- }
- 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)
- {
- lm_info_target *li = (lm_info_target *) so->lm_info;
- gdb_assert (li->name.empty ());
- delete li;
- }
- static void
- solib_target_relocate_section_addresses (struct so_list *so,
- struct target_section *sec)
- {
- CORE_ADDR offset;
- lm_info_target *li = (lm_info_target *) so->lm_info;
- /* 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 (li->offsets.empty ())
- {
- int num_sections = gdb_bfd_count_sections (so->abfd);
- li->offsets.assign (num_sections, 0);
- if (!li->section_bases.empty ())
- {
- int i;
- asection *sect;
- int num_alloc_sections = 0;
- for (i = 0, sect = so->abfd->sections;
- sect != NULL;
- i++, sect = sect->next)
- if ((bfd_section_flags (sect) & SEC_ALLOC))
- num_alloc_sections++;
- if (num_alloc_sections != li->section_bases.size ())
- warning (_("\
- Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
- so->so_name);
- else
- {
- int bases_index = 0;
- int found_range = 0;
- 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_section_flags (sect) & SEC_ALLOC))
- continue;
- if (bfd_section_size (sect) > 0)
- {
- CORE_ADDR low, high;
- low = li->section_bases[i];
- high = low + bfd_section_size (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;
- }
- li->offsets[i] = li->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 (!li->segment_bases.empty ())
- {
- symfile_segment_data_up 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;
- if (!symfile_map_offsets_to_segments (so->abfd, data.get (),
- li->offsets,
- li->segment_bases.size (),
- li->segment_bases.data ()))
- 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 (li->segment_bases.size () > 0);
- orig_delta = li->segment_bases[0] - data->segments[0].base;
- for (i = 1; i < data->segments.size (); i++)
- {
- /* If we have run out of offsets, assume all
- remaining segments have the same offset. */
- if (i >= li->segment_bases.size ())
- continue;
- /* If this segment does not have the same offset, do
- not include it in the library's range. */
- if (li->segment_bases[i] - data->segments[i].base
- != orig_delta)
- break;
- }
- so->addr_low = li->segment_bases[0];
- so->addr_high = (data->segments[i - 1].base
- + data->segments[i - 1].size
- + orig_delta);
- gdb_assert (so->addr_low <= so->addr_high);
- }
- }
- }
- offset = li->offsets[gdb_bfd_section_index (sec->the_bfd_section->owner,
- sec->the_bfd_section)];
- sec->addr += offset;
- sec->endaddr += offset;
- }
- static int
- solib_target_open_symbol_file_object (int from_tty)
- {
- /* 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);
- }
- struct target_so_ops solib_target_so_ops;
- void _initialize_solib_target ();
- void
- _initialize_solib_target ()
- {
- 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.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;
- }
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