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/* Routines for handling XML memory maps provided by target.
Copyright (C) 2006
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 2 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#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"
#include "gdb_expat.h"
/* Internal parsing data passed to all Expat callbacks. */
struct memory_map_parsing_data
{
VEC(mem_region_s) **memory_map;
struct mem_region *currently_parsing;
char *character_data;
const char *property_name;
int capture_text;
};
static void
free_memory_map_parsing_data (void *p_)
{
struct memory_map_parsing_data *p = p_;
xfree (p->character_data);
}
/* Callback called by Expat on start of element.
DATA_ is pointer to memory_map_parsing_data
NAME is the name of element
ATTRS is the zero-terminated array of attribute names and
attribute values.
This function handles the following elements:
- 'memory' -- creates a new memory region and initializes it
from attributes. Sets DATA_.currently_parsing to the new region.
- 'properties' -- sets DATA.capture_text. */
static void
memory_map_start_element (void *data_, const XML_Char *name,
const XML_Char **attrs)
{
static const XML_Char *type_names[] = {"ram", "rom", "flash", 0};
static int type_values[] = { MEM_RW, MEM_RO, MEM_FLASH };
struct memory_map_parsing_data *data = data_;
struct gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
if (strcmp (name, "memory") == 0)
{
struct mem_region *r;
r = VEC_safe_push (mem_region_s, *data->memory_map, NULL);
mem_region_init (r);
r->lo = xml_get_integer_attribute (attrs, "start");
r->hi = r->lo + xml_get_integer_attribute (attrs, "length");
r->attrib.mode = xml_get_enum_value (attrs, "type", type_names,
type_values);
r->attrib.blocksize = -1;
data->currently_parsing = r;
}
else if (strcmp (name, "property") == 0)
{
if (!data->currently_parsing)
throw_error (XML_PARSE_ERROR,
_("memory map: found 'property' element outside 'memory'"));
data->capture_text = 1;
data->property_name = xml_get_required_attribute (attrs, "name");
}
}
if (ex.reason < 0)
throw_error
(ex.error, _("While parsing element %s:\n%s"), name, ex.message);
}
/* Callback called by Expat on start of element. DATA_ is a pointer
to our memory_map_parsing_data. NAME is the name of the element.
This function handles the following elements:
- 'property' -- check that the property name is 'blocksize' and
sets DATA->currently_parsing->attrib.blocksize
- 'memory' verifies that flash block size is set. */
static void
memory_map_end_element (void *data_, const XML_Char *name)
{
struct memory_map_parsing_data *data = data_;
struct gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
if (strcmp (name, "property") == 0)
{
if (strcmp (data->property_name, "blocksize") == 0)
{
char *end = NULL;
if (!data->character_data)
throw_error (XML_PARSE_ERROR,
_("Empty content of 'property' element"));
data->currently_parsing->attrib.blocksize
= strtoul (data->character_data, &end, 0);
if (*end != '\0')
throw_error (XML_PARSE_ERROR,
_("Invalid content of the 'blocksize' property"));
}
else
throw_error (XML_PARSE_ERROR,
_("Unknown memory region property: %s"), name);
data->capture_text = 0;
}
else if (strcmp (name, "memory") == 0)
{
if (data->currently_parsing->attrib.mode == MEM_FLASH
&& data->currently_parsing->attrib.blocksize == -1)
throw_error (XML_PARSE_ERROR,
_("Flash block size is not set"));
data->currently_parsing = 0;
data->character_data = 0;
}
}
if (ex.reason < 0)
throw_error
(ex.error, _("while parsing element %s: \n%s"), name, ex.message);
}
/* Callback called by expat for all character data blocks.
DATA_ is the pointer to memory_map_parsing_data.
S is the point to character data.
LEN is the length of data; the data is not zero-terminated.
If DATA_->CAPTURE_TEXT is 1, appends this block of characters
to DATA_->CHARACTER_DATA. */
static void
memory_map_character_data (void *data_, const XML_Char *s,
int len)
{
struct memory_map_parsing_data *data = data_;
int current_size = 0;
if (!data->capture_text)
return;
/* Expat interface does not guarantee that a single call to
a handler will be made. Actually, one call for each line
will be made, and character data can possibly span several
lines.
Take care to realloc the data if needed. */
if (!data->character_data)
data->character_data = xmalloc (len + 1);
else
{
current_size = strlen (data->character_data);
data->character_data = xrealloc (data->character_data,
current_size + len + 1);
}
memcpy (data->character_data + current_size, s, len);
data->character_data[current_size + len] = '\0';
}
static void
clear_result (void *p)
{
VEC(mem_region_s) **result = p;
VEC_free (mem_region_s, *result);
*result = NULL;
}
VEC(mem_region_s) *
parse_memory_map (const char *memory_map)
{
VEC(mem_region_s) *result = NULL;
struct cleanup *back_to = make_cleanup (null_cleanup, NULL);
struct cleanup *before_deleting_result;
struct cleanup *saved;
volatile struct gdb_exception ex;
int ok = 0;
struct memory_map_parsing_data data = {};
XML_Parser parser = XML_ParserCreateNS (NULL, '!');
if (parser == NULL)
goto out;
make_cleanup_free_xml_parser (parser);
make_cleanup (free_memory_map_parsing_data, &data);
/* Note: 'clear_result' will zero 'result'. */
before_deleting_result = make_cleanup (clear_result, &result);
XML_SetElementHandler (parser, memory_map_start_element,
memory_map_end_element);
XML_SetCharacterDataHandler (parser, memory_map_character_data);
XML_SetUserData (parser, &data);
data.memory_map = &result;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
if (XML_Parse (parser, memory_map, strlen (memory_map), 1)
!= XML_STATUS_OK)
{
enum XML_Error err = XML_GetErrorCode (parser);
throw_error (XML_PARSE_ERROR, "%s", XML_ErrorString (err));
}
}
if (ex.reason != GDB_NO_ERROR)
{
if (ex.error == XML_PARSE_ERROR)
/* Just report it. */
warning (_("Could not parse XML memory map: %s"), ex.message);
else
throw_exception (ex);
}
else
/* Parsed successfully, don't need to delete the result. */
discard_cleanups (before_deleting_result);
out:
do_cleanups (back_to);
return result;
}
#endif /* HAVE_LIBEXPAT */
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