gdb/memory-map.c

/* Routines for handling XML memory maps provided by target.

   Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "memory-map.h"
#include "gdb_assert.h"
#include "exceptions.h"

#include "gdb_string.h"

#if !defined(HAVE_LIBEXPAT)

VEC(mem_region_s) *
parse_memory_map (const char *memory_map)
{
  static int have_warned;

  if (!have_warned)
    {
      have_warned = 1;
      warning (_("Can not parse XML memory map; XML support was disabled "
		 "at compile time"));
    }

  return NULL;
}

#else /* HAVE_LIBEXPAT */

#include "xml-support.h"

/* Internal parsing data passed to all XML callbacks.  */
struct memory_map_parsing_data
  {
    VEC(mem_region_s) **memory_map;
    char property_name[32];
  };

/* Handle the start of a <memory> element.  */

static void
memory_map_start_memory (struct gdb_xml_parser *parser,
			 const struct gdb_xml_element *element,
			 void *user_data, VEC(gdb_xml_value_s) *attributes)
{
  struct memory_map_parsing_data *data = user_data;
  struct mem_region *r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
  ULONGEST *start_p, *length_p, *type_p;

  start_p = VEC_index (gdb_xml_value_s, attributes, 0)->value;
  length_p = VEC_index (gdb_xml_value_s, attributes, 1)->value;
  type_p = VEC_index (gdb_xml_value_s, attributes, 2)->value;

  mem_region_init (r);
  r->lo = *start_p;
  r->hi = r->lo + *length_p;
  r->attrib.mode = *type_p;
  r->attrib.blocksize = -1;
}

/* Handle the end of a <memory> element.  Verify that any necessary
   children were present.  */

static void
memory_map_end_memory (struct gdb_xml_parser *parser,
		       const struct gdb_xml_element *element,
		       void *user_data, const char *body_text)
{
  struct memory_map_parsing_data *data = user_data;
  struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);

  if (r->attrib.mode == MEM_FLASH && r->attrib.blocksize == -1)
    gdb_xml_error (parser, _("Flash block size is not set"));
}

/* Handle the start of a <property> element by saving the name
   attribute for later.  */

static void
memory_map_start_property (struct gdb_xml_parser *parser,
			   const struct gdb_xml_element *element,
			   void *user_data, VEC(gdb_xml_value_s) *attributes)
{
  struct memory_map_parsing_data *data = user_data;
  char *name;

  name = VEC_index (gdb_xml_value_s, attributes, 0)->value;
  snprintf (data->property_name, sizeof (data->property_name), "%s", name);
}

/* Handle the end of a <property> element and its value.  */

static void
memory_map_end_property (struct gdb_xml_parser *parser,
			 const struct gdb_xml_element *element,
			 void *user_data, const char *body_text)
{
  struct memory_map_parsing_data *data = user_data;
  char *name = data->property_name;

  if (strcmp (name, "blocksize") == 0)
    {
      struct mem_region *r = VEC_last (mem_region_s, *data->memory_map);

      r->attrib.blocksize = gdb_xml_parse_ulongest (parser, body_text);
    }
  else
    gdb_xml_debug (parser, _("Unknown property \"%s\""), name);
}

/* Discard the constructed memory map (if an error occurs).  */

static void
clear_result (void *p)
{
  VEC(mem_region_s) **result = p;
  VEC_free (mem_region_s, *result);
  *result = NULL;
}

/* The allowed elements and attributes for an XML memory map.  */

const struct gdb_xml_attribute property_attributes[] = {
  { "name", GDB_XML_AF_NONE, NULL, NULL },
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
};

const struct gdb_xml_element memory_children[] = {
  { "property", property_attributes, NULL,
    GDB_XML_EF_REPEATABLE | GDB_XML_EF_OPTIONAL,
    memory_map_start_property, memory_map_end_property },
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};

const struct gdb_xml_enum memory_type_enum[] = {
  { "ram", MEM_RW },
  { "rom", MEM_RO },
  { "flash", MEM_FLASH },
  { NULL, 0 }
};

const struct gdb_xml_attribute memory_attributes[] = {
  { "start", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
  { "length", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
  { "type", GDB_XML_AF_NONE, gdb_xml_parse_attr_enum, &memory_type_enum },
  { NULL, GDB_XML_AF_NONE, NULL, NULL }
};

const struct gdb_xml_element memory_map_children[] = {
  { "memory", memory_attributes, memory_children, GDB_XML_EF_REPEATABLE,
    memory_map_start_memory, memory_map_end_memory },
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};

const struct gdb_xml_element memory_map_elements[] = {
  { "memory-map", NULL, memory_map_children, GDB_XML_EF_NONE,
    NULL, NULL },
  { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
};

VEC(mem_region_s) *
parse_memory_map (const char *memory_map)
{
  struct gdb_xml_parser *parser;
  VEC(mem_region_s) *result = NULL;
  struct cleanup *before_deleting_result, *back_to;
  struct memory_map_parsing_data data = { NULL };

  back_to = make_cleanup (null_cleanup, NULL);
  parser = gdb_xml_create_parser_and_cleanup (_("target memory map"),
					      memory_map_elements, &data);

  /* Note: 'clear_result' will zero 'result'.  */
  before_deleting_result = make_cleanup (clear_result, &result);
  data.memory_map = &result;

  if (gdb_xml_parse (parser, memory_map) == 0)
    /* Parsed successfully, don't need to delete the result.  */
    discard_cleanups (before_deleting_result);

  do_cleanups (back_to);
  return result;
}

#endif /* HAVE_LIBEXPAT */