gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2018 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 #include "gdb_bfd.h"
  25
  26 /* A target that wraps a BFD.  */
  27
  28 static const target_info target_bfd_target_info = {
  29   "bfd",
  30   N_("BFD backed target"),
  31   N_("You should never see this")
  32 };
  33
  34 class target_bfd : public target_ops
  35 {
  36 public:
  37   explicit target_bfd (struct bfd *bfd);
  38   ~target_bfd () override;
  39
  40   const target_info &info () const override
  41   { return target_bfd_target_info; }
  42
  43   void close () override;
  44
  45   target_xfer_status
  46     xfer_partial (target_object object,
  47                   const char *annex, gdb_byte *readbuf,
  48                   const gdb_byte *writebuf,
  49                   ULONGEST offset, ULONGEST len,
  50                   ULONGEST *xfered_len) override;
  51
  52   target_section_table *get_section_table () override;
  53
  54 private:
  55   /* The BFD we're wrapping.  */
  56   gdb_bfd_ref_ptr m_bfd;
  57
  58   /* The section table build from the ALLOC sections in BFD.  Note
  59      that we can't rely on extracting the BFD from a random section in
  60      the table, since the table can be legitimately empty.  */
  61   struct target_section_table m_table;
  62 };
  63
  64 target_xfer_status
  65 target_bfd::xfer_partial (target_object object,
  66                           const char *annex, gdb_byte *readbuf,
  67                           const gdb_byte *writebuf,
  68                           ULONGEST offset, ULONGEST len,
  69                           ULONGEST *xfered_len)
  70 {
  71   switch (object)
  72     {
  73     case TARGET_OBJECT_MEMORY:
  74       {
  75         return section_table_xfer_memory_partial (readbuf, writebuf,
  76                                                   offset, len, xfered_len,
  77                                                   m_table.sections,
  78                                                   m_table.sections_end,
  79                                                   NULL);
  80       }
  81     default:
  82       return TARGET_XFER_E_IO;
  83     }
  84 }
  85
  86 target_section_table *
  87 target_bfd::get_section_table ()
  88 {
  89   return &m_table;
  90 }
  91
  92 target_bfd::target_bfd (struct bfd *abfd)
  93   : m_bfd (gdb_bfd_ref_ptr::new_reference (abfd))
  94 {
  95   this->to_stratum = file_stratum;
  96   m_table.sections = NULL;
  97   m_table.sections_end = NULL;
  98   build_section_table (abfd, &m_table.sections, &m_table.sections_end);
  99 }
 100
 101 target_bfd::~target_bfd ()
 102 {
 103   xfree (m_table.sections);
 104 }
 105
 106 target_ops *
 107 target_bfd_reopen (struct bfd *abfd)
 108 {
 109   return new target_bfd (abfd);
 110 }
 111
 112 void
 113 target_bfd::close ()
 114 {
 115   delete this;
 116 }