gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2024 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 "target.h"
  21 #include "bfd-target.h"
  22 #include "exec.h"
  23 #include "gdb_bfd.h"
  24
  25 /* A target that wraps a BFD.  */
  26
  27 static const target_info target_bfd_target_info = {
  28   "bfd",
  29   N_("BFD backed target"),
  30   N_("You should never see this")
  31 };
  32
  33 class target_bfd : public target_ops
  34 {
  35 public:
  36   explicit target_bfd (const gdb_bfd_ref_ptr &bfd);
  37
  38   const target_info &info () const override
  39   { return target_bfd_target_info; }
  40
  41   strata stratum () const override { return file_stratum; }
  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   const std::vector<target_section> *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   std::vector<target_section> 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);
  78       }
  79     default:
  80       return TARGET_XFER_E_IO;
  81     }
  82 }
  83
  84 const std::vector<target_section> *
  85 target_bfd::get_section_table ()
  86 {
  87   return &m_table;
  88 }
  89
  90 target_bfd::target_bfd (const gdb_bfd_ref_ptr &abfd)
  91   : m_bfd (abfd),
  92     m_table (build_section_table (abfd.get ()))
  93 {
  94 }
  95
  96 target_ops_up
  97 target_bfd_reopen (const gdb_bfd_ref_ptr &abfd)
  98 {
  99   return target_ops_up (new target_bfd (abfd));
 100 }
 101
 102 void
 103 target_bfd::close ()
 104 {
 105   delete this;
 106 }