예제 #1
0
static void
vmap_ldinfo (LdInfo *ldi)
{
  struct stat ii, vi;
  struct vmap *vp;
  int got_one, retried;
  int got_exec_file = 0;
  uint next;
  int arch64 = ARCH64 ();

  /* For each *ldi, see if we have a corresponding *vp.
     If so, update the mapping, and symbol table.
     If not, add an entry and symbol table.  */

  do
    {
      char *name = LDI_FILENAME (ldi, arch64);
      char *memb = name + strlen (name) + 1;
      int fd = LDI_FD (ldi, arch64);

      retried = 0;

      if (fstat (fd, &ii) < 0)
	{
	  /* The kernel sets ld_info to -1, if the process is still using the
	     object, and the object is removed. Keep the symbol info for the
	     removed object and issue a warning.  */
	  warning (_("%s (fd=%d) has disappeared, keeping its symbols"),
		   name, fd);
	  continue;
	}
    retry:
      for (got_one = 0, vp = vmap; vp; vp = vp->nxt)
	{
	  struct objfile *objfile;

	  /* First try to find a `vp', which is the same as in ldinfo.
	     If not the same, just continue and grep the next `vp'. If same,
	     relocate its tstart, tend, dstart, dend values. If no such `vp'
	     found, get out of this for loop, add this ldi entry as a new vmap
	     (add_vmap) and come back, find its `vp' and so on... */

	  /* The filenames are not always sufficient to match on. */

	  if ((name[0] == '/' && strcmp (name, vp->name) != 0)
	      || (memb[0] && strcmp (memb, vp->member) != 0))
	    continue;

	  /* See if we are referring to the same file.
	     We have to check objfile->obfd, symfile.c:reread_symbols might
	     have updated the obfd after a change.  */
	  objfile = vp->objfile == NULL ? symfile_objfile : vp->objfile;
	  if (objfile == NULL
	      || objfile->obfd == NULL
	      || bfd_stat (objfile->obfd, &vi) < 0)
	    {
	      warning (_("Unable to stat %s, keeping its symbols"), name);
	      continue;
	    }

	  if (ii.st_dev != vi.st_dev || ii.st_ino != vi.st_ino)
	    continue;

	  if (!retried)
	    close (fd);

	  ++got_one;

	  /* Found a corresponding VMAP.  Remap!  */

	  vmap_secs (vp, ldi, arch64);

	  /* The objfile is only NULL for the exec file.  */
	  if (vp->objfile == NULL)
	    got_exec_file = 1;

	  /* relocate symbol table(s). */
	  vmap_symtab (vp);

	  /* Announce new object files.  Doing this after symbol relocation
	     makes aix-thread.c's job easier.  */
	  if (vp->objfile)
	    observer_notify_new_objfile (vp->objfile);

	  /* There may be more, so we don't break out of the loop.  */
	}

      /* if there was no matching *vp, we must perforce create the sucker(s) */
      if (!got_one && !retried)
	{
	  add_vmap (ldi);
	  ++retried;
	  goto retry;
	}
    }
  while ((next = LDI_NEXT (ldi, arch64))
	 && (ldi = (void *) (next + (char *) ldi)));

  /* If we don't find the symfile_objfile anywhere in the ldinfo, it
     is unlikely that the symbol file is relocated to the proper
     address.  And we might have attached to a process which is
     running a different copy of the same executable.  */
  if (symfile_objfile != NULL && !got_exec_file)
    {
      warning (_("Symbol file %s\nis not mapped; discarding it.\n\
If in fact that file has symbols which the mapped files listed by\n\
\"info files\" lack, you can load symbols with the \"symbol-file\" or\n\
\"add-symbol-file\" commands (note that you must take care of relocating\n\
symbols to the proper address)."),
	       symfile_objfile->name);
      free_objfile (symfile_objfile);
      gdb_assert (symfile_objfile == NULL);
    }
예제 #2
0
파일: rs6000-nat.c 프로젝트: DonCN/haiku
void
xcoff_relocate_core (struct target_ops *target)
{
  struct bfd_section *ldinfo_sec;
  int offset = 0;
  LdInfo *ldi;
  struct vmap *vp;
  int arch64 = ARCH64 ();

  /* Size of a struct ld_info except for the variable-length filename. */
  int nonfilesz = (int)LDI_FILENAME ((LdInfo *)0, arch64);

  /* Allocated size of buffer.  */
  int buffer_size = nonfilesz;
  char *buffer = xmalloc (buffer_size);
  struct cleanup *old = make_cleanup (free_current_contents, &buffer);

  ldinfo_sec = bfd_get_section_by_name (core_bfd, ".ldinfo");
  if (ldinfo_sec == NULL)
    {
    bfd_err:
      fprintf_filtered (gdb_stderr, "Couldn't get ldinfo from core file: %s\n",
			bfd_errmsg (bfd_get_error ()));
      do_cleanups (old);
      return;
    }
  do
    {
      int i;
      int names_found = 0;

      /* Read in everything but the name.  */
      if (bfd_get_section_contents (core_bfd, ldinfo_sec, buffer,
				    offset, nonfilesz) == 0)
	goto bfd_err;

      /* Now the name.  */
      i = nonfilesz;
      do
	{
	  if (i == buffer_size)
	    {
	      buffer_size *= 2;
	      buffer = xrealloc (buffer, buffer_size);
	    }
	  if (bfd_get_section_contents (core_bfd, ldinfo_sec, &buffer[i],
					offset + i, 1) == 0)
	    goto bfd_err;
	  if (buffer[i++] == '\0')
	    ++names_found;
	}
      while (names_found < 2);

      ldi = (LdInfo *) buffer;

      /* Can't use a file descriptor from the core file; need to open it.  */
      if (arch64)
	ldi->l64.ldinfo_fd = -1;
      else
	ldi->l32.ldinfo_fd = -1;

      /* The first ldinfo is for the exec file, allocated elsewhere.  */
      if (offset == 0 && vmap != NULL)
	vp = vmap;
      else
	vp = add_vmap (ldi);

      /* Process next shared library upon error. */
      offset += LDI_NEXT (ldi, arch64);
      if (vp == NULL)
	continue;

      vmap_secs (vp, ldi, arch64);

      /* Unless this is the exec file,
         add our sections to the section table for the core target.  */
      if (vp != vmap)
	{
	  struct section_table *stp;

	  target_resize_to_sections (target, 2);
	  stp = target->to_sections_end - 2;

	  stp->bfd = vp->bfd;
	  stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".text");
	  stp->addr = vp->tstart;
	  stp->endaddr = vp->tend;
	  stp++;

	  stp->bfd = vp->bfd;
	  stp->the_bfd_section = bfd_get_section_by_name (stp->bfd, ".data");
	  stp->addr = vp->dstart;
	  stp->endaddr = vp->dend;
	}

      vmap_symtab (vp);

      if (deprecated_target_new_objfile_hook && vp != vmap && vp->objfile)
	deprecated_target_new_objfile_hook (vp->objfile);
    }
  while (LDI_NEXT (ldi, arch64) != 0);
  vmap_exec ();
  breakpoint_re_set ();
  do_cleanups (old);
}