502 lines
14 KiB
C
502 lines
14 KiB
C
/* Definitions for targets which report shared library events.
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Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "objfiles.h"
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#include "solist.h"
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#include "symtab.h"
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#include "symfile.h"
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#include "target.h"
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#include "vec.h"
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#include "solib-target.h"
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#include "gdb_string.h"
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/* Private data for each loaded library. */
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struct lm_info
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{
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/* The library's name. The name is normally kept in the struct
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so_list; it is only here during XML parsing. */
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char *name;
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/* The target can either specify segment bases or section bases, not
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both. */
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/* The base addresses for each independently relocatable segment of
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this shared library. */
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VEC(CORE_ADDR) *segment_bases;
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/* The base addresses for each independently allocatable,
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relocatable section of this shared library. */
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VEC(CORE_ADDR) *section_bases;
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/* The cached offsets for each section of this shared library,
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determined from SEGMENT_BASES, or SECTION_BASES. */
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struct section_offsets *offsets;
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};
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typedef struct lm_info *lm_info_p;
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DEF_VEC_P(lm_info_p);
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#if !defined(HAVE_LIBEXPAT)
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static VEC(lm_info_p) *
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solib_target_parse_libraries (const char *library)
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{
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static int have_warned;
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if (!have_warned)
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{
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have_warned = 1;
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warning (_("Can not parse XML library list; XML support was disabled "
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"at compile time"));
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}
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return NULL;
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}
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#else /* HAVE_LIBEXPAT */
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#include "xml-support.h"
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/* Handle the start of a <segment> element. */
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static void
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library_list_start_segment (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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VEC(lm_info_p) **list = user_data;
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struct lm_info *last = VEC_last (lm_info_p, *list);
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ULONGEST *address_p = xml_find_attribute (attributes, "address")->value;
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CORE_ADDR address = (CORE_ADDR) *address_p;
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if (last->section_bases != NULL)
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gdb_xml_error (parser,
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_("Library list with both segments and sections"));
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VEC_safe_push (CORE_ADDR, last->segment_bases, address);
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}
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static void
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library_list_start_section (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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VEC(lm_info_p) **list = user_data;
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struct lm_info *last = VEC_last (lm_info_p, *list);
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ULONGEST *address_p = xml_find_attribute (attributes, "address")->value;
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CORE_ADDR address = (CORE_ADDR) *address_p;
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if (last->segment_bases != NULL)
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gdb_xml_error (parser,
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_("Library list with both segments and sections"));
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VEC_safe_push (CORE_ADDR, last->section_bases, address);
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}
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/* Handle the start of a <library> element. */
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static void
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library_list_start_library (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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VEC(lm_info_p) **list = user_data;
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struct lm_info *item = XZALLOC (struct lm_info);
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const char *name = xml_find_attribute (attributes, "name")->value;
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item->name = xstrdup (name);
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VEC_safe_push (lm_info_p, *list, item);
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}
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static void
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library_list_end_library (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, const char *body_text)
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{
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VEC(lm_info_p) **list = user_data;
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struct lm_info *lm_info = VEC_last (lm_info_p, *list);
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if (lm_info->segment_bases == NULL
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&& lm_info->section_bases == NULL)
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gdb_xml_error (parser,
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_("No segment or section bases defined"));
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}
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/* Handle the start of a <library-list> element. */
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static void
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library_list_start_list (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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char *version = xml_find_attribute (attributes, "version")->value;
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if (strcmp (version, "1.0") != 0)
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gdb_xml_error (parser,
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_("Library list has unsupported version \"%s\""),
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version);
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}
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/* Discard the constructed library list. */
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static void
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solib_target_free_library_list (void *p)
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{
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VEC(lm_info_p) **result = p;
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struct lm_info *info;
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int ix;
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for (ix = 0; VEC_iterate (lm_info_p, *result, ix, info); ix++)
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{
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xfree (info->name);
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VEC_free (CORE_ADDR, info->segment_bases);
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VEC_free (CORE_ADDR, info->section_bases);
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xfree (info);
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}
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VEC_free (lm_info_p, *result);
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*result = NULL;
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}
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/* The allowed elements and attributes for an XML library list.
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The root element is a <library-list>. */
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static const struct gdb_xml_attribute segment_attributes[] = {
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{ "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute section_attributes[] = {
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{ "address", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element library_children[] = {
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{ "segment", segment_attributes, NULL,
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GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
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library_list_start_segment, NULL },
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{ "section", section_attributes, NULL,
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GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
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library_list_start_section, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute library_attributes[] = {
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{ "name", GDB_XML_AF_NONE, NULL, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element library_list_children[] = {
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{ "library", library_attributes, library_children,
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GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
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library_list_start_library, library_list_end_library },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute library_list_attributes[] = {
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{ "version", GDB_XML_AF_NONE, NULL, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element library_list_elements[] = {
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{ "library-list", library_list_attributes, library_list_children,
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GDB_XML_EF_NONE, library_list_start_list, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static VEC(lm_info_p) *
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solib_target_parse_libraries (const char *library)
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{
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VEC(lm_info_p) *result = NULL;
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struct cleanup *back_to = make_cleanup (solib_target_free_library_list,
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&result);
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if (gdb_xml_parse_quick (_("target library list"), "library-list.dtd",
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library_list_elements, library, &result) == 0)
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{
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/* Parsed successfully, keep the result. */
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discard_cleanups (back_to);
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return result;
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}
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do_cleanups (back_to);
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return NULL;
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}
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#endif
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static struct so_list *
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solib_target_current_sos (void)
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{
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struct so_list *new_solib, *start = NULL, *last = NULL;
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const char *library_document;
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VEC(lm_info_p) *library_list;
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struct lm_info *info;
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int ix;
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/* Fetch the list of shared libraries. */
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library_document = target_read_stralloc (¤t_target,
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TARGET_OBJECT_LIBRARIES,
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NULL);
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if (library_document == NULL)
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return NULL;
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/* Parse the list. */
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library_list = solib_target_parse_libraries (library_document);
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if (library_list == NULL)
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return NULL;
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/* Build a struct so_list for each entry on the list. */
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for (ix = 0; VEC_iterate (lm_info_p, library_list, ix, info); ix++)
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{
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new_solib = XZALLOC (struct so_list);
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strncpy (new_solib->so_name, info->name, SO_NAME_MAX_PATH_SIZE - 1);
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new_solib->so_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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strncpy (new_solib->so_original_name, info->name,
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SO_NAME_MAX_PATH_SIZE - 1);
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new_solib->so_original_name[SO_NAME_MAX_PATH_SIZE - 1] = '\0';
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new_solib->lm_info = info;
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/* We no longer need this copy of the name. */
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xfree (info->name);
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info->name = NULL;
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/* Add it to the list. */
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if (!start)
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last = start = new_solib;
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else
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{
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last->next = new_solib;
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last = new_solib;
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}
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}
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/* Free the library list, but not its members. */
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VEC_free (lm_info_p, library_list);
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return start;
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}
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static void
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solib_target_special_symbol_handling (void)
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{
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/* Nothing needed. */
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}
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static void
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solib_target_solib_create_inferior_hook (int from_tty)
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{
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/* Nothing needed. */
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}
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static void
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solib_target_clear_solib (void)
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{
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/* Nothing needed. */
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}
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static void
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solib_target_free_so (struct so_list *so)
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{
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gdb_assert (so->lm_info->name == NULL);
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xfree (so->lm_info->offsets);
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VEC_free (CORE_ADDR, so->lm_info->segment_bases);
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xfree (so->lm_info);
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}
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static void
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solib_target_relocate_section_addresses (struct so_list *so,
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struct target_section *sec)
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{
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int flags = bfd_get_section_flags (sec->bfd, sec->the_bfd_section);
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CORE_ADDR offset;
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/* Build the offset table only once per object file. We can not do
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it any earlier, since we need to open the file first. */
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if (so->lm_info->offsets == NULL)
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{
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int num_sections = bfd_count_sections (so->abfd);
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so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections));
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if (so->lm_info->section_bases)
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{
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int i;
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asection *sect;
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int num_section_bases
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= VEC_length (CORE_ADDR, so->lm_info->section_bases);
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int num_alloc_sections = 0;
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for (i = 0, sect = so->abfd->sections;
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sect != NULL;
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i++, sect = sect->next)
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if ((bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
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num_alloc_sections++;
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if (num_alloc_sections != num_section_bases)
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warning (_("\
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Could not relocate shared library \"%s\": wrong number of ALLOC sections"),
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so->so_name);
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else
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{
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int bases_index = 0;
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int found_range = 0;
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CORE_ADDR *section_bases;
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section_bases = VEC_address (CORE_ADDR,
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so->lm_info->section_bases);
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so->addr_low = ~(CORE_ADDR) 0;
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so->addr_high = 0;
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for (i = 0, sect = so->abfd->sections;
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sect != NULL;
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i++, sect = sect->next)
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{
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if (!(bfd_get_section_flags (so->abfd, sect) & SEC_ALLOC))
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continue;
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if (bfd_section_size (so->abfd, sect) > 0)
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{
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CORE_ADDR low, high;
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low = section_bases[i];
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high = low + bfd_section_size (so->abfd, sect) - 1;
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if (low < so->addr_low)
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so->addr_low = low;
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if (high > so->addr_high)
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so->addr_high = high;
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gdb_assert (so->addr_low <= so->addr_high);
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found_range = 1;
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}
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so->lm_info->offsets->offsets[i]
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= section_bases[bases_index];
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bases_index++;
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}
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if (!found_range)
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so->addr_low = so->addr_high = 0;
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gdb_assert (so->addr_low <= so->addr_high);
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}
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}
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else if (so->lm_info->segment_bases)
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{
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struct symfile_segment_data *data;
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data = get_symfile_segment_data (so->abfd);
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if (data == NULL)
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warning (_("\
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Could not relocate shared library \"%s\": no segments"), so->so_name);
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else
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{
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ULONGEST orig_delta;
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int i;
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int num_bases;
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CORE_ADDR *segment_bases;
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num_bases = VEC_length (CORE_ADDR, so->lm_info->segment_bases);
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segment_bases = VEC_address (CORE_ADDR,
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so->lm_info->segment_bases);
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if (!symfile_map_offsets_to_segments (so->abfd, data,
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so->lm_info->offsets,
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num_bases, segment_bases))
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warning (_("\
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Could not relocate shared library \"%s\": bad offsets"), so->so_name);
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/* Find the range of addresses to report for this library in
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"info sharedlibrary". Report any consecutive segments
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which were relocated as a single unit. */
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gdb_assert (num_bases > 0);
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orig_delta = segment_bases[0] - data->segment_bases[0];
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for (i = 1; i < data->num_segments; i++)
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{
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/* If we have run out of offsets, assume all
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remaining segments have the same offset. */
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if (i >= num_bases)
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continue;
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/* If this segment does not have the same offset, do
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not include it in the library's range. */
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if (segment_bases[i] - data->segment_bases[i] != orig_delta)
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break;
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}
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so->addr_low = segment_bases[0];
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so->addr_high = (data->segment_bases[i - 1]
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+ data->segment_sizes[i - 1]
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+ orig_delta);
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gdb_assert (so->addr_low <= so->addr_high);
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free_symfile_segment_data (data);
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}
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}
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}
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offset = so->lm_info->offsets->offsets[sec->the_bfd_section->index];
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sec->addr += offset;
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sec->endaddr += offset;
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}
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static int
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solib_target_open_symbol_file_object (void *from_ttyp)
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{
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/* We can't locate the main symbol file based on the target's
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knowledge; the user has to specify it. */
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return 0;
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}
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static int
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solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
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{
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/* We don't have a range of addresses for the dynamic linker; there
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may not be one in the program's address space. So only report
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PLT entries (which may be import stubs). */
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return in_plt_section (pc, NULL);
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}
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struct target_so_ops solib_target_so_ops;
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/* -Wmissing-prototypes */
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extern initialize_file_ftype _initialize_solib_target;
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void
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_initialize_solib_target (void)
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{
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solib_target_so_ops.relocate_section_addresses
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= solib_target_relocate_section_addresses;
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solib_target_so_ops.free_so = solib_target_free_so;
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solib_target_so_ops.clear_solib = solib_target_clear_solib;
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solib_target_so_ops.solib_create_inferior_hook
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= solib_target_solib_create_inferior_hook;
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solib_target_so_ops.special_symbol_handling
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= solib_target_special_symbol_handling;
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solib_target_so_ops.current_sos = solib_target_current_sos;
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solib_target_so_ops.open_symbol_file_object
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= solib_target_open_symbol_file_object;
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solib_target_so_ops.in_dynsym_resolve_code
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= solib_target_in_dynsym_resolve_code;
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solib_target_so_ops.bfd_open = solib_bfd_open;
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/* Set current_target_so_ops to solib_target_so_ops if not already
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set. */
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if (current_target_so_ops == 0)
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current_target_so_ops = &solib_target_so_ops;
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}
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