1 /* Definitions for targets which report shared library events.
3 Copyright (C) 2007-2017 Free Software Foundation, Inc.
5 This file is part of GDB.
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.
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.
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/>. */
27 #include "solib-target.h"
30 /* Private data for each loaded library. */
31 struct lm_info_target : public lm_info_base
33 /* The library's name. The name is normally kept in the struct
34 so_list; it is only here during XML parsing. */
37 /* The target can either specify segment bases or section bases, not
40 /* The base addresses for each independently relocatable segment of
41 this shared library. */
42 std::vector<CORE_ADDR> segment_bases;
44 /* The base addresses for each independently allocatable,
45 relocatable section of this shared library. */
46 std::vector<CORE_ADDR> section_bases;
48 /* The cached offsets for each section of this shared library,
49 determined from SEGMENT_BASES, or SECTION_BASES. */
50 section_offsets *offsets = NULL;
53 typedef lm_info_target *lm_info_target_p;
54 DEF_VEC_P(lm_info_target_p);
56 #if !defined(HAVE_LIBEXPAT)
58 static VEC(lm_info_target_p) *
59 solib_target_parse_libraries (const char *library)
61 static int have_warned;
66 warning (_("Can not parse XML library list; XML support was disabled "
73 #else /* HAVE_LIBEXPAT */
75 #include "xml-support.h"
77 /* Handle the start of a <segment> element. */
80 library_list_start_segment (struct gdb_xml_parser *parser,
81 const struct gdb_xml_element *element,
82 void *user_data, VEC(gdb_xml_value_s) *attributes)
84 VEC(lm_info_target_p) **list = (VEC(lm_info_target_p) **) user_data;
85 lm_info_target *last = VEC_last (lm_info_target_p, *list);
87 = (ULONGEST *) xml_find_attribute (attributes, "address")->value;
88 CORE_ADDR address = (CORE_ADDR) *address_p;
90 if (!last->section_bases.empty ())
91 gdb_xml_error (parser,
92 _("Library list with both segments and sections"));
94 last->segment_bases.push_back (address);
98 library_list_start_section (struct gdb_xml_parser *parser,
99 const struct gdb_xml_element *element,
100 void *user_data, VEC(gdb_xml_value_s) *attributes)
102 VEC(lm_info_target_p) **list = (VEC(lm_info_target_p) **) user_data;
103 lm_info_target *last = VEC_last (lm_info_target_p, *list);
105 = (ULONGEST *) xml_find_attribute (attributes, "address")->value;
106 CORE_ADDR address = (CORE_ADDR) *address_p;
108 if (!last->segment_bases.empty ())
109 gdb_xml_error (parser,
110 _("Library list with both segments and sections"));
112 last->section_bases.push_back (address);
115 /* Handle the start of a <library> element. */
118 library_list_start_library (struct gdb_xml_parser *parser,
119 const struct gdb_xml_element *element,
120 void *user_data, VEC(gdb_xml_value_s) *attributes)
122 VEC(lm_info_target_p) **list = (VEC(lm_info_target_p) **) user_data;
123 lm_info_target *item = new lm_info_target;
125 = (const char *) xml_find_attribute (attributes, "name")->value;
127 item->name = xstrdup (name);
128 VEC_safe_push (lm_info_target_p, *list, item);
132 library_list_end_library (struct gdb_xml_parser *parser,
133 const struct gdb_xml_element *element,
134 void *user_data, const char *body_text)
136 VEC(lm_info_target_p) **list = (VEC(lm_info_target_p) **) user_data;
137 lm_info_target *lm_info = VEC_last (lm_info_target_p, *list);
139 if (lm_info->segment_bases.empty () && lm_info->section_bases.empty ())
140 gdb_xml_error (parser, _("No segment or section bases defined"));
144 /* Handle the start of a <library-list> element. */
147 library_list_start_list (struct gdb_xml_parser *parser,
148 const struct gdb_xml_element *element,
149 void *user_data, VEC(gdb_xml_value_s) *attributes)
151 struct gdb_xml_value *version = xml_find_attribute (attributes, "version");
153 /* #FIXED attribute may be omitted, Expat returns NULL in such case. */
156 const char *string = (const char *) version->value;
158 if (strcmp (string, "1.0") != 0)
159 gdb_xml_error (parser,
160 _("Library list has unsupported version \"%s\""),
165 /* Discard the constructed library list. */
168 solib_target_free_library_list (void *p)
170 VEC(lm_info_target_p) **result = (VEC(lm_info_target_p) **) p;
171 lm_info_target *info;
174 for (ix = 0; VEC_iterate (lm_info_target_p, *result, ix, info); ix++)
177 VEC_free (lm_info_target_p, *result);
181 /* The allowed elements and attributes for an XML library list.
182 The root element is a <library-list>. */
184 static const struct gdb_xml_attribute segment_attributes[] = {
185 { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
186 { NULL, GDB_XML_AF_NONE, NULL, NULL }
189 static const struct gdb_xml_attribute section_attributes[] = {
190 { "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
191 { NULL, GDB_XML_AF_NONE, NULL, NULL }
194 static const struct gdb_xml_element library_children[] = {
195 { "segment", segment_attributes, NULL,
196 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
197 library_list_start_segment, NULL },
198 { "section", section_attributes, NULL,
199 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
200 library_list_start_section, NULL },
201 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
204 static const struct gdb_xml_attribute library_attributes[] = {
205 { "name", GDB_XML_AF_NONE, NULL, NULL },
206 { NULL, GDB_XML_AF_NONE, NULL, NULL }
209 static const struct gdb_xml_element library_list_children[] = {
210 { "library", library_attributes, library_children,
211 GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
212 library_list_start_library, library_list_end_library },
213 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
216 static const struct gdb_xml_attribute library_list_attributes[] = {
217 { "version", GDB_XML_AF_OPTIONAL, NULL, NULL },
218 { NULL, GDB_XML_AF_NONE, NULL, NULL }
221 static const struct gdb_xml_element library_list_elements[] = {
222 { "library-list", library_list_attributes, library_list_children,
223 GDB_XML_EF_NONE, library_list_start_list, NULL },
224 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
227 static VEC(lm_info_target_p) *
228 solib_target_parse_libraries (const char *library)
230 VEC(lm_info_target_p) *result = NULL;
231 struct cleanup *back_to = make_cleanup (solib_target_free_library_list,
234 if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd",
235 library_list_elements, library, &result) == 0)
237 /* Parsed successfully, keep the result. */
238 discard_cleanups (back_to);
242 do_cleanups (back_to);
247 static struct so_list *
248 solib_target_current_sos (void)
250 struct so_list *new_solib, *start = NULL, *last = NULL;
251 char *library_document;
252 struct cleanup *old_chain;
253 VEC(lm_info_target_p) *library_list;
254 lm_info_target *info;
257 /* Fetch the list of shared libraries. */
258 library_document = target_read_stralloc (¤t_target,
259 TARGET_OBJECT_LIBRARIES,
261 if (library_document == NULL)
264 /* solib_target_parse_libraries may throw, so we use a cleanup. */
265 old_chain = make_cleanup (xfree, library_document);
267 /* Parse the list. */
268 library_list = solib_target_parse_libraries (library_document);
270 /* library_document string is not needed behind this point. */
271 do_cleanups (old_chain);
273 if (library_list == NULL)
276 /* Build a struct so_list for each entry on the list. */
277 for (ix = 0; VEC_iterate (lm_info_target_p, library_list, ix, info); ix++)
279 new_solib = XCNEW (struct so_list);
280 strncpy (new_solib->so_name, info->name.c_str (),
281 SO_NAME_MAX_PATH_SIZE - 1);
282 new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
283 strncpy (new_solib->so_original_name, info->name.c_str (),
284 SO_NAME_MAX_PATH_SIZE - 1);
285 new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
286 new_solib->lm_info = info;
288 /* We no longer need this copy of the name. */
291 /* Add it to the list. */
293 last = start = new_solib;
296 last->next = new_solib;
301 /* Free the library list, but not its members. */
302 VEC_free (lm_info_target_p, library_list);
308 solib_target_solib_create_inferior_hook (int from_tty)
310 /* Nothing needed. */
314 solib_target_clear_solib (void)
316 /* Nothing needed. */
320 solib_target_free_so (struct so_list *so)
322 lm_info_target *li = (lm_info_target *) so->lm_info;
324 gdb_assert (li->name.empty ());
330 solib_target_relocate_section_addresses (struct so_list *so,
331 struct target_section *sec)
334 lm_info_target *li = (lm_info_target *) so->lm_info;
336 /* Build the offset table only once per object file. We can not do
337 it any earlier, since we need to open the file first. */
338 if (li->offsets == NULL)
340 int num_sections = gdb_bfd_count_sections (so->abfd);
343 = ((struct section_offsets *)
344 xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)));
346 if (!li->section_bases.empty ())
350 int num_alloc_sections = 0;
352 for (i = 0, sect = so->abfd->sections;
354 i++, sect = sect->next)
355 if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
356 num_alloc_sections++;
358 if (num_alloc_sections != li->section_bases.size ())
360 Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
367 so->addr_low = ~(CORE_ADDR) 0;
369 for (i = 0, sect = so->abfd->sections;
371 i++, sect = sect->next)
373 if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
375 if (bfd_section_size (so->abfd, sect) > 0)
379 low = li->section_bases[i];
380 high = low + bfd_section_size (so->abfd, sect) - 1;
382 if (low < so->addr_low)
384 if (high > so->addr_high)
385 so->addr_high = high;
386 gdb_assert (so->addr_low <= so->addr_high);
389 li->offsets->offsets[i] = li->section_bases[bases_index];
393 so->addr_low = so->addr_high = 0;
394 gdb_assert (so->addr_low <= so->addr_high);
397 else if (!li->segment_bases.empty ())
399 struct symfile_segment_data *data;
401 data = get_symfile_segment_data (so->abfd);
404 Could not relocate shared library \"%s\": no segments"), so->so_name);
410 if (!symfile_map_offsets_to_segments (so->abfd, data, li->offsets,
411 li->segment_bases.size (),
412 li->segment_bases.data ()))
414 Could not relocate shared library \"%s\": bad offsets"), so->so_name);
416 /* Find the range of addresses to report for this library in
417 "info sharedlibrary". Report any consecutive segments
418 which were relocated as a single unit. */
419 gdb_assert (li->segment_bases.size () > 0);
420 orig_delta = li->segment_bases[0] - data->segment_bases[0];
422 for (i = 1; i < data->num_segments; i++)
424 /* If we have run out of offsets, assume all
425 remaining segments have the same offset. */
426 if (i >= li->segment_bases.size ())
429 /* If this segment does not have the same offset, do
430 not include it in the library's range. */
431 if (li->segment_bases[i] - data->segment_bases[i]
436 so->addr_low = li->segment_bases[0];
437 so->addr_high = (data->segment_bases[i - 1]
438 + data->segment_sizes[i - 1]
440 gdb_assert (so->addr_low <= so->addr_high);
442 free_symfile_segment_data (data);
447 offset = li->offsets->offsets[gdb_bfd_section_index
448 (sec->the_bfd_section->owner,
449 sec->the_bfd_section)];
451 sec->endaddr += offset;
455 solib_target_open_symbol_file_object (void *from_ttyp)
457 /* We can't locate the main symbol file based on the target's
458 knowledge; the user has to specify it. */
463 solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
465 /* We don't have a range of addresses for the dynamic linker; there
466 may not be one in the program's address space. So only report
467 PLT entries (which may be import stubs). */
468 return in_plt_section (pc);
471 struct target_so_ops solib_target_so_ops;
474 _initialize_solib_target (void)
476 solib_target_so_ops.relocate_section_addresses
477 = solib_target_relocate_section_addresses;
478 solib_target_so_ops.free_so = solib_target_free_so;
479 solib_target_so_ops.clear_solib = solib_target_clear_solib;
480 solib_target_so_ops.solib_create_inferior_hook
481 = solib_target_solib_create_inferior_hook;
482 solib_target_so_ops.current_sos = solib_target_current_sos;
483 solib_target_so_ops.open_symbol_file_object
484 = solib_target_open_symbol_file_object;
485 solib_target_so_ops.in_dynsym_resolve_code
486 = solib_target_in_dynsym_resolve_code;
487 solib_target_so_ops.bfd_open = solib_bfd_open;
489 /* Set current_target_so_ops to solib_target_so_ops if not already
491 if (current_target_so_ops == 0)
492 current_target_so_ops = &solib_target_so_ops;