gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003, 2005, 2007-2012 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "target.h"
  22 #include "bfd-target.h"
  23 #include "exec.h"
  24
  25 /* The object that is stored in the target_ops->to_data field has this
  26    type.  */
  27 struct target_bfd_data
  28 {
  29   /* The BFD we're wrapping.  */
  30   struct bfd *bfd;
  31
  32   /* The section table build from the ALLOC sections in BFD.  Note
  33      that we can't rely on extracting the BFD from a random section in
  34      the table, since the table can be legitimately empty.  */
  35   struct target_section_table table;
  36 };
  37
  38 static LONGEST
  39 target_bfd_xfer_partial (struct target_ops *ops,
  40                          enum target_object object,
  41                          const char *annex, gdb_byte *readbuf,
  42                          const gdb_byte *writebuf,
  43                          ULONGEST offset, LONGEST len)
  44 {
  45   switch (object)
  46     {
  47     case TARGET_OBJECT_MEMORY:
  48       {
  49         struct target_bfd_data *data = ops->to_data;
  50         return section_table_xfer_memory_partial (readbuf, writebuf,
  51                                                   offset, len,
  52                                                   data->table.sections,
  53                                                   data->table.sections_end,
  54                                                   NULL);
  55       }
  56     default:
  57       return -1;
  58     }
  59 }
  60
  61 static struct target_section_table *
  62 target_bfd_get_section_table (struct target_ops *ops)
  63 {
  64   struct target_bfd_data *data = ops->to_data;
  65   return &data->table;
  66 }
  67
  68 static void
  69 target_bfd_xclose (struct target_ops *t, int quitting)
  70 {
  71   struct target_bfd_data *data = t->to_data;
  72
  73   bfd_close (data->bfd);
  74   xfree (data->table.sections);
  75   xfree (data);
  76   xfree (t);
  77 }
  78
  79 struct target_ops *
  80 target_bfd_reopen (struct bfd *abfd)
  81 {
  82   struct target_ops *t;
  83   struct target_bfd_data *data;
  84
  85   data = XZALLOC (struct target_bfd_data);
  86   data->bfd = abfd;
  87   build_section_table (abfd, &data->table.sections, &data->table.sections_end);
  88
  89   t = XZALLOC (struct target_ops);
  90   t->to_shortname = "bfd";
  91   t->to_longname = _("BFD backed target");
  92   t->to_doc = _("You should never see this");
  93   t->to_get_section_table = target_bfd_get_section_table;
  94   t->to_xfer_partial = target_bfd_xfer_partial;
  95   t->to_xclose = target_bfd_xclose;
  96   t->to_data = data;
  97
  98   return t;
  99 }