gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006-2013 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 #include "gdb_assert.h"
  23 #include "exceptions.h"
  24
  25 #include "gdb_string.h"
  26
  27 #if !defined(HAVE_LIBEXPAT)
  28
  29 VEC(mem_region_s) *
  30 parse_memory_map (const char *memory_map)
  31 {
  32   static int have_warned;
  33
  34   if (!have_warned)
  35     {
  36       have_warned = 1;
  37       warning (_("Can not parse XML memory map; XML support was disabled "
  38                  "at compile time"));
  39     }
  40
  41   return NULL;
  42 }
  43
  44 #else /* HAVE_LIBEXPAT */
  45
  46 #include "xml-support.h"
  47
  48 /* Internal parsing data passed to all XML callbacks.  */
  49 struct memory_map_parsing_data
  50   {
  51     VEC(mem_region_s) **memory_map;
  52     char property_name[32];
  53   };
  54
  55 /* Handle the start of a <memory> element.  */
  56
  57 static void
  58 memory_map_start_memory (struct gdb_xml_parser *parser,
  59                          const struct gdb_xml_element *element,
  60                          void *user_data, VEC(gdb_xml_value_s) *attributes)
  61 {
  62   struct memory_map_parsing_data *data = user_data;
  63   struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  64   ULONGEST *start_p, *length_p, *type_p;
  65
  66   start_p = xml_find_attribute (attributes, "start")->value;
  67   length_p = xml_find_attribute (attributes, "length")->value;
  68   type_p = 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 = *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 = user_data;
  86   struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
  87
  88   if (r->attrib.mode == MEM_FLASH && r->attrib.blocksize == -1)
  89     gdb_xml_error (parser, _("Flash block size is not set"));
  90 }
  91
  92 /* Handle the start of a <property> element by saving the name
  93    attribute for later.  */
  94
  95 static void
  96 memory_map_start_property (struct gdb_xml_parser *parser,
  97                            const struct gdb_xml_element *element,
  98                            void *user_data, VEC(gdb_xml_value_s) *attributes)
  99 {
 100   struct memory_map_parsing_data *data = user_data;
 101   char *name;
 102
 103   name = xml_find_attribute (attributes, "name")->value;
 104   snprintf (data->property_name, sizeof (data->property_name), "%s", name);
 105 }
 106
 107 /* Handle the end of a <property> element and its value.  */
 108
 109 static void
 110 memory_map_end_property (struct gdb_xml_parser *parser,
 111                          const struct gdb_xml_element *element,
 112                          void *user_data, const char *body_text)
 113 {
 114   struct memory_map_parsing_data *data = user_data;
 115   char *name = data->property_name;
 116
 117   if (strcmp (name, "blocksize") == 0)
 118     {
 119       struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
 120
 121       r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 122     }
 123   else
 124     gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
 125 }
 126
 127 /* Discard the constructed memory map (if an error occurs).  */
 128
 129 static void
 130 clear_result (void *p)
 131 {
 132   VEC(mem_region_s) **result = p;
 133   VEC_free (mem_region_s, *result);
 134   *result = NULL;
 135 }
 136
 137 /* The allowed elements and attributes for an XML memory map.  */
 138
 139 const struct gdb_xml_attribute property_attributes[] = {
 140   { "name", GDB_XML_AF_NONE, NULL, NULL },
 141   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 142 };
 143
 144 const struct gdb_xml_element memory_children[] = {
 145   { "property", property_attributes, NULL,
 146     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 147     memory_map_start_property, memory_map_end_property },
 148   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 149 };
 150
 151 const struct gdb_xml_enum memory_type_enum[] = {
 152   { "ram", MEM_RW },
 153   { "rom", MEM_RO },
 154   { "flash", MEM_FLASH },
 155   { NULL, 0 }
 156 };
 157
 158 const struct gdb_xml_attribute memory_attributes[] = {
 159   { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 160   { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 161   { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
 162   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 163 };
 164
 165 const struct gdb_xml_element memory_map_children[] = {
 166   { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
 167     memory_map_start_memory, memory_map_end_memory },
 168   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 169 };
 170
 171 const struct gdb_xml_element memory_map_elements[] = {
 172   { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
 173     NULL, NULL },
 174   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 175 };
 176
 177 VEC(mem_region_s) *
 178 parse_memory_map (const char *memory_map)
 179 {
 180   VEC(mem_region_s) *result = NULL;
 181   struct cleanup *back_to;
 182   struct memory_map_parsing_data data = { NULL };
 183
 184   data.memory_map = &result;
 185   back_to = make_cleanup (clear_result, &result);
 186   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 187                            memory_map, &data) == 0)
 188     {
 189       /* Parsed successfully, keep the result.  */
 190       discard_cleanups (back_to);
 191       return result;
 192     }
 193
 194   do_cleanups (back_to);
 195   return NULL;
 196 }
 197
 198 #endif /* HAVE_LIBEXPAT */