From cfa9d6d99135b1d59ecf0756247305cc24869549 Mon Sep 17 00:00:00 2001 From: Daniel Jacobowitz Date: Mon, 2 Jul 2007 22:01:09 +0000 Subject: * Makefile.in (XMLFILES): Add library-list.dtd. (ALLDEPFILES): Add solib-target.o. (solib-target.o): New rule. * remote.c (PACKET_qXfer_libraries): New constant. (remote_protocol_features): Add qXfer:libraries:read. (remote_wait): Recognize library stop replies. (remote_async_wait): Likewise. Fix typo. (remote_xfer_partial): Handle TARGET_OBJECT_LIBRARIES. (init_remote_async_ops): Fix typo. (_initialize_remote): Register "set remote library-info-packet". * solib-som.c (som_current_sos): Set addr_low and addr_high. * solib-target.c: New file. * solib.c (solib_map_sections): Use addr_low and addr_high instead of textsection. (info_sharedlibrary_command): Likewise. (solib_add_library, solib_remove_library): New. * solist.h (struct so_list): Replace textsection with addr_low and addr_high. * target.h (enum target_object): Add TARGET_OBJECT_LIBRARIES. * NEWS: Describe new qXfer:libraries:read and shared library event support. * features/library-list.dtd: New. * gdb.texinfo (Remote Configuration): Document library-info-packet. Add other missing entries. Adjust the table size to fit. (Stop Reply Packets): Use @itemize instead of @enumerate. Document stop reasons including the new "library" event. (General Query Packets): Adjust table widths for qSupported. Mention qXfer:libraries:read reply to qSupported and document the new packet. (Library List Format): New section. --- gdb/solib-target.c | 384 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 384 insertions(+) create mode 100644 gdb/solib-target.c (limited to 'gdb/solib-target.c') diff --git a/gdb/solib-target.c b/gdb/solib-target.c new file mode 100644 index 0000000..2009df4 --- /dev/null +++ b/gdb/solib-target.c @@ -0,0 +1,384 @@ +/* Definitions for targets which report shared library events. + + Copyright (C) 2007 + 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 2 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, write to the Free Software + Foundation, Inc., 51 Franklin Street, Fifth Floor, + Boston, MA 02110-1301, USA. */ + +#include "defs.h" +#include "objfiles.h" +#include "solist.h" +#include "symtab.h" +#include "symfile.h" +#include "target.h" +#include "vec.h" + +#include "gdb_string.h" + +DEF_VEC_O(CORE_ADDR); + +/* 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 base addresses for each independently relocatable segment of + this shared library. */ + VEC(CORE_ADDR) *segment_bases; + + /* The cached offsets for each section of this shared library, + determined from SEGMENT_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 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 = VEC_index (gdb_xml_value_s, attributes, 0)->value; + + VEC_safe_push (CORE_ADDR, last->segment_bases, address_p); +} + +/* Handle the start of a 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 = VEC_index (gdb_xml_value_s, attributes, 0)->value; + + item->name = xstrdup (name); + VEC_safe_push (lm_info_p, *list, item); +} + +/* Handle the start of a 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 = VEC_index (gdb_xml_value_s, attributes, 0)->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); + 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 . */ + +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 } +}; + +const struct gdb_xml_element library_children[] = { + { "segment", segment_attributes, NULL, GDB_XML_EF_REPEATABLE, + library_list_start_segment, NULL }, + { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } +}; + +const struct gdb_xml_attribute library_attributes[] = { + { "name", GDB_XML_AF_NONE, NULL, NULL }, + { NULL, GDB_XML_AF_NONE, NULL, NULL } +}; + +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, NULL }, + { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL } +}; + +const struct gdb_xml_attribute library_list_attributes[] = { + { "version", GDB_XML_AF_NONE, NULL, NULL }, + { NULL, GDB_XML_AF_NONE, NULL, NULL } +}; + +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) +{ + struct gdb_xml_parser *parser; + VEC(lm_info_p) *result = NULL; + struct cleanup *before_deleting_result, *back_to; + + back_to = make_cleanup (null_cleanup, NULL); + parser = gdb_xml_create_parser_and_cleanup (_("target library list"), + library_list_elements, &result); + gdb_xml_use_dtd (parser, "library-list.dtd"); + + before_deleting_result = make_cleanup (solib_target_free_library_list, + &result); + + if (gdb_xml_parse (parser, library) == 0) + /* Parsed successfully, don't need to delete the result. */ + discard_cleanups (before_deleting_result); + + do_cleanups (back_to); + return result; +} +#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 (void) +{ + /* 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 section_table *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) + { + struct symfile_segment_data *data; + int num_sections = bfd_count_sections (so->abfd); + + so->lm_info->offsets = xzalloc (SIZEOF_N_SECTION_OFFSETS (num_sections)); + + 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 = VEC_length (CORE_ADDR, so->lm_info->segment_bases); + CORE_ADDR *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] + /* FIXME this must be needed! + orig_delta */); + + 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); +} + +static struct target_so_ops solib_target_so_ops; + +extern initialize_file_ftype _initialize_solib_target; /* -Wmissing-prototypes */ + +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; + + current_target_so_ops = &solib_target_so_ops; +} -- cgit v1.1