gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006-2020 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 "memory-map.h"
  22
  23 #if !defined(HAVE_LIBEXPAT)
  24
  25 std::vector<mem_region>
  26 parse_memory_map (const char *memory_map)
  27 {
  28   static int have_warned;
  29
  30   if (!have_warned)
  31     {
  32       have_warned = 1;
  33       warning (_("Can not parse XML memory map; XML support was disabled "
  34                  "at compile time"));
  35     }
  36
  37   return std::vector<mem_region> ();
  38 }
  39
  40 #else /* HAVE_LIBEXPAT */
  41
  42 #include "xml-support.h"
  43
  44 /* Internal parsing data passed to all XML callbacks.  */
  45 struct memory_map_parsing_data
  46 {
  47   memory_map_parsing_data (std::vector<mem_region> *memory_map_)
  48   : memory_map (memory_map_)
  49   {}
  50
  51   std::vector<mem_region> *memory_map;
  52
  53   std::string property_name;
  54 };
  55
  56 /* Handle the start of a <memory> element.  */
  57
  58 static void
  59 memory_map_start_memory (struct gdb_xml_parser *parser,
  60                          const struct gdb_xml_element *element,
  61                          void *user_data,
  62                          std::vector<gdb_xml_value> &attributes)
  63 {
  64   struct memory_map_parsing_data *data
  65     = (struct memory_map_parsing_data *) user_data;
  66   ULONGEST *start_p, *length_p, *type_p;
  67
  68   start_p
  69     = (ULONGEST *) xml_find_attribute (attributes, "start")->value.get ();
  70   length_p
  71     = (ULONGEST *) xml_find_attribute (attributes, "length")->value.get ();
  72   type_p
  73     = (ULONGEST *) xml_find_attribute (attributes, "type")->value.get ();
  74
  75   data->memory_map->emplace_back (*start_p, *start_p + *length_p,
  76                                   (enum mem_access_mode) *type_p);
  77 }
  78
  79 /* Handle the end of a <memory> element.  Verify that any necessary
  80    children were present.  */
  81
  82 static void
  83 memory_map_end_memory (struct gdb_xml_parser *parser,
  84                        const struct gdb_xml_element *element,
  85                        void *user_data, const char *body_text)
  86 {
  87   struct memory_map_parsing_data *data
  88     = (struct memory_map_parsing_data *) user_data;
  89   const mem_region &r = data->memory_map->back ();
  90
  91   if (r.attrib.mode == MEM_FLASH && r.attrib.blocksize == -1)
  92     gdb_xml_error (parser, _("Flash block size is not set"));
  93 }
  94
  95 /* Handle the start of a <property> element by saving the name
  96    attribute for later.  */
  97
  98 static void
  99 memory_map_start_property (struct gdb_xml_parser *parser,
 100                            const struct gdb_xml_element *element,
 101                            void *user_data,
 102                            std::vector<gdb_xml_value> &attributes)
 103 {
 104   struct memory_map_parsing_data *data
 105     = (struct memory_map_parsing_data *) user_data;
 106   char *name;
 107
 108   name = (char *) xml_find_attribute (attributes, "name")->value.get ();
 109   data->property_name.assign (name);
 110 }
 111
 112 /* Handle the end of a <property> element and its value.  */
 113
 114 static void
 115 memory_map_end_property (struct gdb_xml_parser *parser,
 116                          const struct gdb_xml_element *element,
 117                          void *user_data, const char *body_text)
 118 {
 119   struct memory_map_parsing_data *data
 120     = (struct memory_map_parsing_data *) user_data;
 121
 122   if (data->property_name == "blocksize")
 123     {
 124       mem_region &r = data->memory_map->back ();
 125
 126       r.attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 127     }
 128   else
 129     gdb_xml_debug (parser, _("Unknown property \"%s\""),
 130                    data->property_name.c_str ());
 131 }
 132
 133 /* The allowed elements and attributes for an XML memory map.  */
 134
 135 const struct gdb_xml_attribute property_attributes[] = {
 136   { "name", GDB_XML_AF_NONE, NULL, NULL },
 137   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 138 };
 139
 140 const struct gdb_xml_element memory_children[] = {
 141   { "property", property_attributes, NULL,
 142     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 143     memory_map_start_property, memory_map_end_property },
 144   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 145 };
 146
 147 const struct gdb_xml_enum memory_type_enum[] = {
 148   { "ram", MEM_RW },
 149   { "rom", MEM_RO },
 150   { "flash", MEM_FLASH },
 151   { NULL, 0 }
 152 };
 153
 154 const struct gdb_xml_attribute memory_attributes[] = {
 155   { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 156   { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 157   { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
 158   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 159 };
 160
 161 const struct gdb_xml_element memory_map_children[] = {
 162   { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
 163     memory_map_start_memory, memory_map_end_memory },
 164   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 165 };
 166
 167 const struct gdb_xml_element memory_map_elements[] = {
 168   { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
 169     NULL, NULL },
 170   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 171 };
 172
 173 std::vector<mem_region>
 174 parse_memory_map (const char *memory_map)
 175 {
 176   std::vector<mem_region> ret;
 177   memory_map_parsing_data data (&ret);
 178
 179   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 180                            memory_map, &data) == 0)
 181     {
 182       /* Parsed successfully, keep the result.  */
 183       return ret;
 184     }
 185
 186   return std::vector<mem_region> ();
 187 }
 188
 189 #endif /* HAVE_LIBEXPAT */