gdb/memtag.c

   1 /* GDB generic memory tagging functions.
   2
   3    Copyright (C) 2022-2023 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 "memtag.h"
  22 #include "bfd.h"
  23
  24 /* See memtag.h */
  25
  26 bool
  27 get_next_core_memtag_section (bfd *abfd, asection *section,
  28                               CORE_ADDR address, memtag_section_info &info)
  29 {
  30   /* If the caller provided no SECTION to start from, search from the
  31      beginning.  */
  32   if (section == nullptr)
  33     section = bfd_get_section_by_name (abfd, "memtag");
  34
  35   /* Go through all the memtag sections and figure out if ADDRESS
  36      falls within one of the memory ranges that contain tags.  */
  37   while (section != nullptr)
  38     {
  39       size_t memtag_range_size = section->rawsize;
  40       size_t tags_size = bfd_section_size (section);
  41
  42       /* Empty memory range or empty tag dump should not happen.  Warn about
  43          it but keep going through the sections.  */
  44       if (memtag_range_size == 0 || tags_size == 0)
  45         {
  46           warning (_("Found memtag section with empty memory "
  47                      "range or empty tag dump"));
  48           continue;
  49         }
  50       else
  51         {
  52           CORE_ADDR start_address = bfd_section_vma (section);
  53           CORE_ADDR end_address = start_address + memtag_range_size;
  54
  55           /* Is the address within [start_address, end_address)?  */
  56           if (address >= start_address
  57               && address < end_address)
  58             {
  59               info.start_address = start_address;
  60               info.end_address = end_address;
  61               info.memtag_section = section;
  62               return true;
  63             }
  64         }
  65       section = bfd_get_next_section_by_name (abfd, section);
  66     }
  67   return false;
  68 }