gdb/memory-map.c

   1 /* Routines for handling XML memory maps provided by target.
   2
   3    Copyright (C) 2006-2014 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 "exceptions.h"
  23
  24 #include <string.h>
  25
  26 #if !defined(HAVE_LIBEXPAT)
  27
  28 VEC(mem_region_s) *
  29 parse_memory_map (const char *memory_map)
  30 {
  31   static int have_warned;
  32
  33   if (!have_warned)
  34     {
  35       have_warned = 1;
  36       warning (_("Can not parse XML memory map; XML support was disabled "
  37                  "at compile time"));
  38     }
  39
  40   return NULL;
  41 }
  42
  43 #else /* HAVE_LIBEXPAT */
  44
  45 #include "xml-support.h"
  46
  47 /* Internal parsing data passed to all XML callbacks.  */
  48 struct memory_map_parsing_data
  49   {
  50     VEC(mem_region_s) **memory_map;
  51     char property_name[32];
  52   };
  53
  54 /* Handle the start of a <memory> element.  */
  55
  56 static void
  57 memory_map_start_memory (struct gdb_xml_parser *parser,
  58                          const struct gdb_xml_element *element,
  59                          void *user_data, VEC(gdb_xml_value_s) *attributes)
  60 {
  61   struct memory_map_parsing_data *data = user_data;
  62   struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  63   ULONGEST *start_p, *length_p, *type_p;
  64
  65   start_p = xml_find_attribute (attributes, "start")->value;
  66   length_p = xml_find_attribute (attributes, "length")->value;
  67   type_p = xml_find_attribute (attributes, "type")->value;
  68
  69   mem_region_init (r);
  70   r->lo = *start_p;
  71   r->hi = r->lo + *length_p;
  72   r->attrib.mode = *type_p;
  73   r->attrib.blocksize = -1;
  74 }
  75
  76 /* Handle the end of a <memory> element.  Verify that any necessary
  77    children were present.  */
  78
  79 static void
  80 memory_map_end_memory (struct gdb_xml_parser *parser,
  81                        const struct gdb_xml_element *element,
  82                        void *user_data, const char *body_text)
  83 {
  84   struct memory_map_parsing_data *data = user_data;
  85   struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
  86
  87   if (r->attrib.mode == MEM_FLASH && r->attrib.blocksize == -1)
  88     gdb_xml_error (parser, _("Flash block size is not set"));
  89 }
  90
  91 /* Handle the start of a <property> element by saving the name
  92    attribute for later.  */
  93
  94 static void
  95 memory_map_start_property (struct gdb_xml_parser *parser,
  96                            const struct gdb_xml_element *element,
  97                            void *user_data, VEC(gdb_xml_value_s) *attributes)
  98 {
  99   struct memory_map_parsing_data *data = user_data;
 100   char *name;
 101
 102   name = xml_find_attribute (attributes, "name")->value;
 103   snprintf (data->property_name, sizeof (data->property_name), "%s", name);
 104 }
 105
 106 /* Handle the end of a <property> element and its value.  */
 107
 108 static void
 109 memory_map_end_property (struct gdb_xml_parser *parser,
 110                          const struct gdb_xml_element *element,
 111                          void *user_data, const char *body_text)
 112 {
 113   struct memory_map_parsing_data *data = user_data;
 114   char *name = data->property_name;
 115
 116   if (strcmp (name, "blocksize") == 0)
 117     {
 118       struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);
 119
 120       r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
 121     }
 122   else
 123     gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
 124 }
 125
 126 /* Discard the constructed memory map (if an error occurs).  */
 127
 128 static void
 129 clear_result (void *p)
 130 {
 131   VEC(mem_region_s) **result = p;
 132   VEC_free (mem_region_s, *result);
 133   *result = NULL;
 134 }
 135
 136 /* The allowed elements and attributes for an XML memory map.  */
 137
 138 const struct gdb_xml_attribute property_attributes[] = {
 139   { "name", GDB_XML_AF_NONE, NULL, NULL },
 140   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 141 };
 142
 143 const struct gdb_xml_element memory_children[] = {
 144   { "property", property_attributes, NULL,
 145     GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
 146     memory_map_start_property, memory_map_end_property },
 147   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 148 };
 149
 150 const struct gdb_xml_enum memory_type_enum[] = {
 151   { "ram", MEM_RW },
 152   { "rom", MEM_RO },
 153   { "flash", MEM_FLASH },
 154   { NULL, 0 }
 155 };
 156
 157 const struct gdb_xml_attribute memory_attributes[] = {
 158   { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 159   { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
 160   { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
 161   { NULL, GDB_XML_AF_NONE, NULL, NULL }
 162 };
 163
 164 const struct gdb_xml_element memory_map_children[] = {
 165   { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
 166     memory_map_start_memory, memory_map_end_memory },
 167   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 168 };
 169
 170 const struct gdb_xml_element memory_map_elements[] = {
 171   { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
 172     NULL, NULL },
 173   { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
 174 };
 175
 176 VEC(mem_region_s) *
 177 parse_memory_map (const char *memory_map)
 178 {
 179   VEC(mem_region_s) *result = NULL;
 180   struct cleanup *back_to;
 181   struct memory_map_parsing_data data = { NULL };
 182
 183   data.memory_map = &result;
 184   back_to = make_cleanup (clear_result, &result);
 185   if (gdb_xml_parse_quick (_("target memory map"), NULL, memory_map_elements,
 186                            memory_map, &data) == 0)
 187     {
 188       /* Parsed successfully, keep the result.  */
 189       discard_cleanups (back_to);
 190       return result;
 191     }
 192
 193   do_cleanups (back_to);
 194   return NULL;
 195 }
 196
 197 #endif /* HAVE_LIBEXPAT */