gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2019 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
  22 /* Local non-gdb includes.  */
  23 #include "bfd-target.h"
  24 #include "exec.h"
  25 #include "gdb_bfd.h"
  26 #include "target.h"
  27
  28 /* A target that wraps a BFD.  */
  29
  30 static const target_info target_bfd_target_info = {
  31   "bfd",
  32   N_("BFD backed target"),
  33   N_("You should never see this")
  34 };
  35
  36 class target_bfd : public target_ops
  37 {
  38 public:
  39   explicit target_bfd (struct bfd *bfd);
  40   ~target_bfd () override;
  41
  42   const target_info &info () const override
  43   { return target_bfd_target_info; }
  44
  45   strata stratum () const override { return file_stratum; }
  46
  47   void close () override;
  48
  49   target_xfer_status
  50     xfer_partial (target_object object,
  51                   const char *annex, gdb_byte *readbuf,
  52                   const gdb_byte *writebuf,
  53                   ULONGEST offset, ULONGEST len,
  54                   ULONGEST *xfered_len) override;
  55
  56   target_section_table *get_section_table () override;
  57
  58 private:
  59   /* The BFD we're wrapping.  */
  60   gdb_bfd_ref_ptr m_bfd;
  61
  62   /* The section table build from the ALLOC sections in BFD.  Note
  63      that we can't rely on extracting the BFD from a random section in
  64      the table, since the table can be legitimately empty.  */
  65   struct target_section_table m_table;
  66 };
  67
  68 target_xfer_status
  69 target_bfd::xfer_partial (target_object object,
  70                           const char *annex, gdb_byte *readbuf,
  71                           const gdb_byte *writebuf,
  72                           ULONGEST offset, ULONGEST len,
  73                           ULONGEST *xfered_len)
  74 {
  75   switch (object)
  76     {
  77     case TARGET_OBJECT_MEMORY:
  78       {
  79         return section_table_xfer_memory_partial (readbuf, writebuf,
  80                                                   offset, len, xfered_len,
  81                                                   m_table.sections,
  82                                                   m_table.sections_end,
  83                                                   NULL);
  84       }
  85     default:
  86       return TARGET_XFER_E_IO;
  87     }
  88 }
  89
  90 target_section_table *
  91 target_bfd::get_section_table ()
  92 {
  93   return &m_table;
  94 }
  95
  96 target_bfd::target_bfd (struct bfd *abfd)
  97   : m_bfd (gdb_bfd_ref_ptr::new_reference (abfd))
  98 {
  99   m_table.sections = NULL;
 100   m_table.sections_end = NULL;
 101   build_section_table (abfd, &m_table.sections, &m_table.sections_end);
 102 }
 103
 104 target_bfd::~target_bfd ()
 105 {
 106   xfree (m_table.sections);
 107 }
 108
 109 target_ops *
 110 target_bfd_reopen (struct bfd *abfd)
 111 {
 112   return new target_bfd (abfd);
 113 }
 114
 115 void
 116 target_bfd::close ()
 117 {
 118   delete this;
 119 }