예제 #1
0
파일: symfile-mem.c 프로젝트: Xilinx/gdb
/* Read inferior memory at ADDR to find the header of a loaded object file
   and read its in-core symbols out of inferior memory.  TEMPL is a bfd
   representing the target's format.  NAME is the name to use for this
   symbol file in messages; it can be NULL or a malloc-allocated string
   which will be attached to the BFD.  */
static struct objfile *
symbol_file_add_from_memory (struct bfd *templ, CORE_ADDR addr, char *name,
			     int from_tty)
{
  struct objfile *objf;
  struct bfd *nbfd;
  struct bfd_section *sec;
  bfd_vma loadbase;
  struct section_addr_info *sai;
  unsigned int i;
  struct cleanup *cleanup;

  if (bfd_get_flavour (templ) != bfd_target_elf_flavour)
    error (_("add-symbol-file-from-memory not supported for this target"));

  nbfd = bfd_elf_bfd_from_remote_memory (templ, addr, &loadbase,
					 target_read_memory_bfd);
  if (nbfd == NULL)
    error (_("Failed to read a valid object file image from memory."));

  gdb_bfd_ref (nbfd);
  if (name == NULL)
    nbfd->filename = "shared object read from target memory";
  else
    {
      nbfd->filename = name;
      gdb_bfd_stash_filename (nbfd);
      xfree (name);
    }

  cleanup = make_cleanup_bfd_unref (nbfd);

  if (!bfd_check_format (nbfd, bfd_object))
    error (_("Got object file from memory but can't read symbols: %s."),
	   bfd_errmsg (bfd_get_error ()));

  sai = alloc_section_addr_info (bfd_count_sections (nbfd));
  make_cleanup (xfree, sai);
  i = 0;
  for (sec = nbfd->sections; sec != NULL; sec = sec->next)
    if ((bfd_get_section_flags (nbfd, sec) & (SEC_ALLOC|SEC_LOAD)) != 0)
      {
	sai->other[i].addr = bfd_get_section_vma (nbfd, sec) + loadbase;
	sai->other[i].name = (char *) bfd_get_section_name (nbfd, sec);
	sai->other[i].sectindex = sec->index;
	++i;
      }
  sai->num_sections = i;

  objf = symbol_file_add_from_bfd (nbfd, bfd_get_filename (nbfd),
				   from_tty ? SYMFILE_VERBOSE : 0,
                                   sai, OBJF_SHARED, NULL);

  /* This might change our ideas about frames already looked at.  */
  reinit_frame_cache ();

  do_cleanups (cleanup);
  return objf;
}
예제 #2
0
static bfd *
gdb_bfd_mach_o_fat_extract (bfd *abfd, bfd_format format,
			    const bfd_arch_info_type *arch)
{
  bfd *result = bfd_mach_o_fat_extract (abfd, format, arch);

  if (result == NULL)
    return NULL;

  if (result == abfd)
    gdb_bfd_ref (result);
  else
    gdb_bfd_mark_parent (result, abfd);

  return result;
}
예제 #3
0
파일: bfd-target.c 프로젝트: 5kg/gdb
struct target_ops *
target_bfd_reopen (struct bfd *abfd)
{
  struct target_ops *t;
  struct target_bfd_data *data;

  data = XZALLOC (struct target_bfd_data);
  data->bfd = abfd;
  gdb_bfd_ref (abfd);
  build_section_table (abfd, &data->table.sections, &data->table.sections_end);

  t = XZALLOC (struct target_ops);
  t->to_shortname = "bfd";
  t->to_longname = _("BFD backed target");
  t->to_doc = _("You should never see this");
  t->to_get_section_table = target_bfd_get_section_table;
  t->to_xfer_partial = target_bfd_xfer_partial;
  t->to_xclose = target_bfd_xclose;
  t->to_data = data;

  return t;
}
예제 #4
0
void
exec_file_attach (const char *filename, int from_tty)
{
  struct cleanup *cleanups;

  /* First, acquire a reference to the current exec_bfd.  We release
     this at the end of the function; but acquiring it now lets the
     BFD cache return it if this call refers to the same file.  */
  gdb_bfd_ref (exec_bfd);
  cleanups = make_cleanup_bfd_unref (exec_bfd);

  /* Remove any previous exec file.  */
  exec_close ();

  /* Now open and digest the file the user requested, if any.  */

  if (!filename)
    {
      if (from_tty)
        printf_unfiltered (_("No executable file now.\n"));

      set_gdbarch_from_file (NULL);
    }
  else
    {
      int load_via_target = 0;
      char *scratch_pathname, *canonical_pathname;
      int scratch_chan;
      struct target_section *sections = NULL, *sections_end = NULL;
      char **matching;

      if (is_target_filename (filename))
	{
	  if (target_filesystem_is_local ())
	    filename += strlen (TARGET_SYSROOT_PREFIX);
	  else
	    load_via_target = 1;
	}

      if (load_via_target)
	{
	  /* gdb_bfd_fopen does not support "target:" filenames.  */
	  if (write_files)
	    warning (_("writing into executable files is "
		       "not supported for %s sysroots"),
		     TARGET_SYSROOT_PREFIX);

	  scratch_pathname = xstrdup (filename);
	  make_cleanup (xfree, scratch_pathname);

	  scratch_chan = -1;

	  canonical_pathname = scratch_pathname;
	}
      else
	{
	  scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST,
				filename, write_files ?
				O_RDWR | O_BINARY : O_RDONLY | O_BINARY,
				&scratch_pathname);
#if defined(__GO32__) || defined(_WIN32) || defined(__CYGWIN__)
	  if (scratch_chan < 0)
	    {
	      char *exename = alloca (strlen (filename) + 5);

	      strcat (strcpy (exename, filename), ".exe");
	      scratch_chan = openp (getenv ("PATH"), OPF_TRY_CWD_FIRST,
				    exename, write_files ?
				    O_RDWR | O_BINARY
				    : O_RDONLY | O_BINARY,
				    &scratch_pathname);
	    }
#endif
	  if (scratch_chan < 0)
	    perror_with_name (filename);

	  make_cleanup (xfree, scratch_pathname);

	  /* gdb_bfd_open (and its variants) prefers canonicalized
	     pathname for better BFD caching.  */
	  canonical_pathname = gdb_realpath (scratch_pathname);
	  make_cleanup (xfree, canonical_pathname);
	}

      if (write_files && !load_via_target)
	exec_bfd = gdb_bfd_fopen (canonical_pathname, gnutarget,
				  FOPEN_RUB, scratch_chan);
      else
	exec_bfd = gdb_bfd_open (canonical_pathname, gnutarget, scratch_chan);

      if (!exec_bfd)
	{
	  error (_("\"%s\": could not open as an executable file: %s"),
		 scratch_pathname, bfd_errmsg (bfd_get_error ()));
	}

      /* gdb_realpath_keepfile resolves symlinks on the local
	 filesystem and so cannot be used for "target:" files.  */
      gdb_assert (exec_filename == NULL);
      if (load_via_target)
	exec_filename = xstrdup (bfd_get_filename (exec_bfd));
      else
	exec_filename = gdb_realpath_keepfile (scratch_pathname);

      if (!bfd_check_format_matches (exec_bfd, bfd_object, &matching))
	{
	  /* Make sure to close exec_bfd, or else "run" might try to use
	     it.  */
	  exec_close ();
	  error (_("\"%s\": not in executable format: %s"),
		 scratch_pathname,
		 gdb_bfd_errmsg (bfd_get_error (), matching));
	}

      if (build_section_table (exec_bfd, &sections, &sections_end))
	{
	  /* Make sure to close exec_bfd, or else "run" might try to use
	     it.  */
	  exec_close ();
	  error (_("\"%s\": can't find the file sections: %s"),
		 scratch_pathname, bfd_errmsg (bfd_get_error ()));
	}

      exec_bfd_mtime = bfd_get_mtime (exec_bfd);

      validate_files ();

      set_gdbarch_from_file (exec_bfd);

      /* Add the executable's sections to the current address spaces'
	 list of sections.  This possibly pushes the exec_ops
	 target.  */
      add_target_sections (&exec_bfd, sections, sections_end);
      xfree (sections);

      /* Tell display code (if any) about the changed file name.  */
      if (deprecated_exec_file_display_hook)
	(*deprecated_exec_file_display_hook) (filename);
    }

  do_cleanups (cleanups);

  bfd_cache_close_all ();
  observer_notify_executable_changed ();
}