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/* Definitions for targets which report shared library events.

   Copyright (C) 2007, 2008, 2009, 2010 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"

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 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 = VEC_index (gdb_xml_value_s, attributes, 0)->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 = VEC_index (gdb_xml_value_s, attributes, 0)->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 = VEC_index (gdb_xml_value_s, attributes, 0)->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 = 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);

      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>.  */

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_attribute section_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 | 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 }

};

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, library_list_end_library },

  { 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 (&current_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;

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;

  solib_target_so_ops.bfd_open = solib_bfd_open;

}