gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006-2015 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 = user_data;
  59   struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  60   ULONGEST *start_p, *length_p, *type_p;
  61
  62   start_p = xml_find_attribute (attributes, "start")->value;
  63   length_p = xml_find_attribute (attributes, "length")->value;
  64   type_p = xml_find_attribute (attributes, "type")->value;
  65
  66   mem_region_init (r);
  67   r->lo = *start_p;
  68   r->hi = r->lo + *length_p;
  69   r->attrib.mode = *type_p;
  70   r->attrib.blocksize = -1;
  71 }
  72
  73 /* Handle the end of a <memory> element.  Verify that any necessary
  74    children were present.  */
  75
  76 static void
  77 memory_map_end_memory (struct gdb_xml_parser *parser,
  78                        const struct gdb_xml_element *element,
  79                        void *user_data, const char *body_text)
  80 {
  81   struct memory_map_parsing_data *data = user_data;
  82   struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
  83
  84   if (r->attrib.mode == MEM_FLASH && r->attrib.blocksize == -1)
  85     gdb_xml_error (parser, _("Flash block size is not set"));
  86 }
  87
  88 /* Handle the start of a <property> element by saving the name
  89    attribute for later.  */
  90
  91 static void
  92 memory_map_start_property (struct gdb_xml_parser *parser,
  93                            const struct gdb_xml_element *element,
  94                            void *user_data, VEC(gdb_xml_value_s) *attributes)
  95 {
  96   struct memory_map_parsing_data *data = user_data;
  97   char *name;
  98
  99   name = xml_find_attribute (attributes, "name")->value;
 100   snprintf (data->property_name, sizeof (data->property_name), "%s", name);
 101 }
 102
 103 /* Handle the end of a <property> element and its value.  */
 104
 105 static void
 106 memory_map_end_property (struct gdb_xml_parser *parser,
 107                          const struct gdb_xml_element *element,
 108                          void *user_data, const char *body_text)
 109 {
 110   struct memory_map_parsing_data *data = user_data;
 111   char *name = data->property_name;
 112
 113   if (strcmp (name, "blocksize") == 0)
 114     {
 115       struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
 116
 117       r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 118     }
 119   else
 120     gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
 121 }
 122
 123 /* Discard the constructed memory map (if an error occurs).  */
 124
 125 static void
 126 clear_result (void *p)
 127 {
 128   VEC(mem_region_s) **result = p;
 129   VEC_free (mem_region_s, *result);
 130   *result = NULL;
 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 VEC(mem_region_s) *
 174 parse_memory_map (const char *memory_map)
 175 {
 176   VEC(mem_region_s) *result = NULL;
 177   struct cleanup *back_to;
 178   struct memory_map_parsing_data data = { NULL };
 179
 180   data.memory_map = &result;
 181   back_to = make_cleanup (clear_result, &result);
 182   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 183                            memory_map, &data) == 0)
 184     {
 185       /* Parsed successfully, keep the result.  */
 186       discard_cleanups (back_to);
 187       return result;
 188     }
 189
 190   do_cleanups (back_to);
 191   return NULL;
 192 }
 193
 194 #endif /* HAVE_LIBEXPAT */