gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "memory-map.h"
  23 #include "gdb_assert.h"
  24 #include "exceptions.h"
  25
  26 #include "gdb_string.h"
  27
  28 #if !defined(HAVE_LIBEXPAT)
  29
  30 VEC(mem_region_s) *
  31 parse_memory_map (const char *memory_map)
  32 {
  33   static int have_warned;
  34
  35   if (!have_warned)
  36     {
  37       have_warned = 1;
  38       warning (_("Can not parse XML memory map; XML support was disabled "
  39                  "at compile time"));
  40     }
  41
  42   return NULL;
  43 }
  44
  45 #else /* HAVE_LIBEXPAT */
  46
  47 #include "xml-support.h"
  48
  49 /* Internal parsing data passed to all XML callbacks.  */
  50 struct memory_map_parsing_data
  51   {
  52     VEC(mem_region_s) **memory_map;
  53     char property_name[32];
  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, VEC(gdb_xml_value_s) *attributes)
  62 {
  63   struct memory_map_parsing_data *data = user_data;
  64   struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  65   ULONGEST *start_p, *length_p, *type_p;
  66
  67   start_p = xml_find_attribute (attributes, "start")->value;
  68   length_p = xml_find_attribute (attributes, "length")->value;
  69   type_p = xml_find_attribute (attributes, "type")->value;
  70
  71   mem_region_init (r);
  72   r->lo = *start_p;
  73   r->hi = r->lo + *length_p;
  74   r->attrib.mode = *type_p;
  75   r->attrib.blocksize = -1;
  76 }
  77
  78 /* Handle the end of a <memory> element.  Verify that any necessary
  79    children were present.  */
  80
  81 static void
  82 memory_map_end_memory (struct gdb_xml_parser *parser,
  83                        const struct gdb_xml_element *element,
  84                        void *user_data, const char *body_text)
  85 {
  86   struct memory_map_parsing_data *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 = user_data;
 102   char *name;
 103
 104   name = xml_find_attribute (attributes, "name")->value;
 105   snprintf (data->property_name, sizeof (data->property_name), "%s", name);
 106 }
 107
 108 /* Handle the end of a <property> element and its value.  */
 109
 110 static void
 111 memory_map_end_property (struct gdb_xml_parser *parser,
 112                          const struct gdb_xml_element *element,
 113                          void *user_data, const char *body_text)
 114 {
 115   struct memory_map_parsing_data *data = user_data;
 116   char *name = data->property_name;
 117
 118   if (strcmp (name, "blocksize") == 0)
 119     {
 120       struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
 121
 122       r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 123     }
 124   else
 125     gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
 126 }
 127
 128 /* Discard the constructed memory map (if an error occurs).  */
 129
 130 static void
 131 clear_result (void *p)
 132 {
 133   VEC(mem_region_s) **result = p;
 134   VEC_free (mem_region_s, *result);
 135   *result = NULL;
 136 }
 137
 138 /* The allowed elements and attributes for an XML memory map.  */
 139
 140 const struct gdb_xml_attribute property_attributes[] = {
 141   { "name", GDB_XML_AF_NONE, NULL, NULL },
 142   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 143 };
 144
 145 const struct gdb_xml_element memory_children[] = {
 146   { "property", property_attributes, NULL,
 147     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 148     memory_map_start_property, memory_map_end_property },
 149   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 150 };
 151
 152 const struct gdb_xml_enum memory_type_enum[] = {
 153   { "ram", MEM_RW },
 154   { "rom", MEM_RO },
 155   { "flash", MEM_FLASH },
 156   { NULL, 0 }
 157 };
 158
 159 const struct gdb_xml_attribute memory_attributes[] = {
 160   { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 161   { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 162   { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
 163   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 164 };
 165
 166 const struct gdb_xml_element memory_map_children[] = {
 167   { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
 168     memory_map_start_memory, memory_map_end_memory },
 169   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 170 };
 171
 172 const struct gdb_xml_element memory_map_elements[] = {
 173   { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
 174     NULL, NULL },
 175   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 176 };
 177
 178 VEC(mem_region_s) *
 179 parse_memory_map (const char *memory_map)
 180 {
 181   VEC(mem_region_s) *result = NULL;
 182   struct cleanup *back_to;
 183   struct memory_map_parsing_data data = { NULL };
 184
 185   data.memory_map = &result;
 186   back_to = make_cleanup (clear_result, &result);
 187   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 188                            memory_map, &data) == 0)
 189     {
 190       /* Parsed successfully, keep the result.  */
 191       discard_cleanups (back_to);
 192       return result;
 193     }
 194
 195   do_cleanups (back_to);
 196   return NULL;
 197 }
 198
 199 #endif /* HAVE_LIBEXPAT */