gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006-2016 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 VEC(mem_region_s) *
  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 NULL;
  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     VEC(mem_region_s) **memory_map;
  48     char property_name[32];
  49   };
  50
  51 /* Handle the start of a <memory> element.  */
  52
  53 static void
  54 memory_map_start_memory (struct gdb_xml_parser *parser,
  55                          const struct gdb_xml_element *element,
  56                          void *user_data, VEC(gdb_xml_value_s) *attributes)
  57 {
  58   struct memory_map_parsing_data *data
  59     = (struct memory_map_parsing_data *) user_data;
  60   struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  61   ULONGEST *start_p, *length_p, *type_p;
  62
  63   start_p
  64     = (ULONGEST *) xml_find_attribute (attributes, "start")->value;
  65   length_p
  66     = (ULONGEST *) xml_find_attribute (attributes, "length")->value;
  67   type_p
  68     = (ULONGEST *) xml_find_attribute (attributes, "type")->value;
  69
  70   mem_region_init (r);
  71   r->lo = *start_p;
  72   r->hi = r->lo + *length_p;
  73   r->attrib.mode = (enum mem_access_mode) *type_p;
  74   r->attrib.blocksize = -1;
  75 }
  76
  77 /* Handle the end of a <memory> element.  Verify that any necessary
  78    children were present.  */
  79
  80 static void
  81 memory_map_end_memory (struct gdb_xml_parser *parser,
  82                        const struct gdb_xml_element *element,
  83                        void *user_data, const char *body_text)
  84 {
  85   struct memory_map_parsing_data *data
  86     = (struct memory_map_parsing_data *) user_data;
  87   struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
  88
  89   if (r->attrib.mode == MEM_FLASH && r->attrib.blocksize == -1)
  90     gdb_xml_error (parser, _("Flash block size is not set"));
  91 }
  92
  93 /* Handle the start of a <property> element by saving the name
  94    attribute for later.  */
  95
  96 static void
  97 memory_map_start_property (struct gdb_xml_parser *parser,
  98                            const struct gdb_xml_element *element,
  99                            void *user_data, VEC(gdb_xml_value_s) *attributes)
 100 {
 101   struct memory_map_parsing_data *data
 102     = (struct memory_map_parsing_data *) user_data;
 103   char *name;
 104
 105   name = (char *) xml_find_attribute (attributes, "name")->value;
 106   snprintf (data->property_name, sizeof (data->property_name), "%s", name);
 107 }
 108
 109 /* Handle the end of a <property> element and its value.  */
 110
 111 static void
 112 memory_map_end_property (struct gdb_xml_parser *parser,
 113                          const struct gdb_xml_element *element,
 114                          void *user_data, const char *body_text)
 115 {
 116   struct memory_map_parsing_data *data
 117     = (struct memory_map_parsing_data *) user_data;
 118   char *name = data->property_name;
 119
 120   if (strcmp (name, "blocksize") == 0)
 121     {
 122       struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
 123
 124       r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 125     }
 126   else
 127     gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
 128 }
 129
 130 /* Discard the constructed memory map (if an error occurs).  */
 131
 132 static void
 133 clear_result (void *p)
 134 {
 135   VEC(mem_region_s) **result = (VEC(mem_region_s) **) p;
 136   VEC_free (mem_region_s, *result);
 137   *result = NULL;
 138 }
 139
 140 /* The allowed elements and attributes for an XML memory map.  */
 141
 142 const struct gdb_xml_attribute property_attributes[] = {
 143   { "name", GDB_XML_AF_NONE, NULL, NULL },
 144   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 145 };
 146
 147 const struct gdb_xml_element memory_children[] = {
 148   { "property", property_attributes, NULL,
 149     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 150     memory_map_start_property, memory_map_end_property },
 151   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 152 };
 153
 154 const struct gdb_xml_enum memory_type_enum[] = {
 155   { "ram", MEM_RW },
 156   { "rom", MEM_RO },
 157   { "flash", MEM_FLASH },
 158   { NULL, 0 }
 159 };
 160
 161 const struct gdb_xml_attribute memory_attributes[] = {
 162   { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 163   { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 164   { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
 165   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 166 };
 167
 168 const struct gdb_xml_element memory_map_children[] = {
 169   { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
 170     memory_map_start_memory, memory_map_end_memory },
 171   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 172 };
 173
 174 const struct gdb_xml_element memory_map_elements[] = {
 175   { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
 176     NULL, NULL },
 177   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 178 };
 179
 180 VEC(mem_region_s) *
 181 parse_memory_map (const char *memory_map)
 182 {
 183   VEC(mem_region_s) *result = NULL;
 184   struct cleanup *back_to;
 185   struct memory_map_parsing_data data = { NULL };
 186
 187   data.memory_map = &result;
 188   back_to = make_cleanup (clear_result, &result);
 189   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 190                            memory_map, &data) == 0)
 191     {
 192       /* Parsed successfully, keep the result.  */
 193       discard_cleanups (back_to);
 194       return result;
 195     }
 196
 197   do_cleanups (back_to);
 198   return NULL;
 199 }
 200
 201 #endif /* HAVE_LIBEXPAT */