gdb/bfd-target.c

   1 /* Very simple "bfd" target, for GDB, the GNU debugger.
   2
   3    Copyright (C) 2003-2020 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   strata stratum () const override { return file_stratum; }
  44
  45   void close () override;
  46
  47   target_xfer_status
  48     xfer_partial (target_object object,
  49                   const char *annex, gdb_byte *readbuf,
  50                   const gdb_byte *writebuf,
  51                   ULONGEST offset, ULONGEST len,
  52                   ULONGEST *xfered_len) override;
  53
  54   target_section_table *get_section_table () override;
  55
  56 private:
  57   /* The BFD we're wrapping.  */
  58   gdb_bfd_ref_ptr m_bfd;
  59
  60   /* The section table build from the ALLOC sections in BFD.  Note
  61      that we can't rely on extracting the BFD from a random section in
  62      the table, since the table can be legitimately empty.  */
  63   struct target_section_table m_table;
  64 };
  65
  66 target_xfer_status
  67 target_bfd::xfer_partial (target_object object,
  68                           const char *annex, gdb_byte *readbuf,
  69                           const gdb_byte *writebuf,
  70                           ULONGEST offset, ULONGEST len,
  71                           ULONGEST *xfered_len)
  72 {
  73   switch (object)
  74     {
  75     case TARGET_OBJECT_MEMORY:
  76       {
  77         return section_table_xfer_memory_partial (readbuf, writebuf,
  78                                                   offset, len, xfered_len,
  79                                                   m_table.sections,
  80                                                   m_table.sections_end,
  81                                                   NULL);
  82       }
  83     default:
  84       return TARGET_XFER_E_IO;
  85     }
  86 }
  87
  88 target_section_table *
  89 target_bfd::get_section_table ()
  90 {
  91   return &m_table;
  92 }
  93
  94 target_bfd::target_bfd (struct bfd *abfd)
  95   : m_bfd (gdb_bfd_ref_ptr::new_reference (abfd))
  96 {
  97   m_table.sections = NULL;
  98   m_table.sections_end = NULL;
  99   build_section_table (abfd, &m_table.sections, &m_table.sections_end);
 100 }
 101
 102 target_bfd::~target_bfd ()
 103 {
 104   xfree (m_table.sections);
 105 }
 106
 107 target_ops *
 108 target_bfd_reopen (struct bfd *abfd)
 109 {
 110   return new target_bfd (abfd);
 111 }
 112
 113 void
 114 target_bfd::close ()
 115 {
 116   delete this;
 117 }