gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2021 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 (const gdb_bfd_ref_ptr &bfd);
  38
  39   const target_info &info () const override
  40   { return target_bfd_target_info; }
  41
  42   strata stratum () const override { return file_stratum; }
  43
  44   void close () override;
  45
  46   target_xfer_status
  47     xfer_partial (target_object object,
  48                   const char *annex, gdb_byte *readbuf,
  49                   const gdb_byte *writebuf,
  50                   ULONGEST offset, ULONGEST len,
  51                   ULONGEST *xfered_len) override;
  52
  53   const target_section_table *get_section_table () override;
  54
  55 private:
  56   /* The BFD we're wrapping.  */
  57   gdb_bfd_ref_ptr m_bfd;
  58
  59   /* The section table build from the ALLOC sections in BFD.  Note
  60      that we can't rely on extracting the BFD from a random section in
  61      the table, since the table can be legitimately empty.  */
  62   target_section_table m_table;
  63 };
  64
  65 target_xfer_status
  66 target_bfd::xfer_partial (target_object object,
  67                           const char *annex, gdb_byte *readbuf,
  68                           const gdb_byte *writebuf,
  69                           ULONGEST offset, ULONGEST len,
  70                           ULONGEST *xfered_len)
  71 {
  72   switch (object)
  73     {
  74     case TARGET_OBJECT_MEMORY:
  75       {
  76         return section_table_xfer_memory_partial (readbuf, writebuf,
  77                                                   offset, len, xfered_len,
  78                                                   m_table);
  79       }
  80     default:
  81       return TARGET_XFER_E_IO;
  82     }
  83 }
  84
  85 const target_section_table *
  86 target_bfd::get_section_table ()
  87 {
  88   return &m_table;
  89 }
  90
  91 target_bfd::target_bfd (const gdb_bfd_ref_ptr &abfd)
  92   : m_bfd (abfd),
  93     m_table (build_section_table (abfd.get ()))
  94 {
  95 }
  96
  97 target_ops *
  98 target_bfd_reopen (const gdb_bfd_ref_ptr &abfd)
  99 {
 100   return new target_bfd (abfd);
 101 }
 102
 103 void
 104 target_bfd::close ()
 105 {
 106   delete this;
 107 }