633 lines
19 KiB
C
633 lines
19 KiB
C
/* XML target description support for GDB.
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Copyright (C) 2006-2015 Free Software Foundation, Inc.
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Contributed by CodeSourcery.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "target.h"
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#include "target-descriptions.h"
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#include "xml-support.h"
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#include "xml-tdesc.h"
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#include "osabi.h"
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#include "filenames.h"
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#if !defined(HAVE_LIBEXPAT)
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/* Parse DOCUMENT into a target description. Or don't, since we don't have
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an XML parser. */
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static struct target_desc *
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tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
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void *fetcher_baton)
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{
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static int have_warned;
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if (!have_warned)
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{
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have_warned = 1;
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warning (_("Can not parse XML target description; XML support was "
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"disabled at compile time"));
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}
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return NULL;
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}
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#else /* HAVE_LIBEXPAT */
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/* A record of every XML description we have parsed. We never discard
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old descriptions, because we never discard gdbarches. As long as we
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have a gdbarch referencing this description, we want to have a copy
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of it here, so that if we parse the same XML document again we can
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return the same "struct target_desc *"; if they are not singletons,
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then we will create unnecessary duplicate gdbarches. See
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gdbarch_list_lookup_by_info. */
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struct tdesc_xml_cache
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{
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const char *xml_document;
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struct target_desc *tdesc;
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};
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typedef struct tdesc_xml_cache tdesc_xml_cache_s;
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DEF_VEC_O(tdesc_xml_cache_s);
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static VEC(tdesc_xml_cache_s) *xml_cache;
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/* Callback data for target description parsing. */
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struct tdesc_parsing_data
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{
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/* The target description we are building. */
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struct target_desc *tdesc;
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/* The target feature we are currently parsing, or last parsed. */
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struct tdesc_feature *current_feature;
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/* The register number to use for the next register we see, if
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it does not have its own. This starts at zero. */
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int next_regnum;
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/* The struct or union we are currently parsing, or last parsed. */
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struct tdesc_type *current_type;
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/* The byte size of the current struct type, if specified. Zero
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if not specified. */
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int current_type_size;
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/* Whether the current type is a flags type. */
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int current_type_is_flags;
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};
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/* Handle the end of an <architecture> element and its value. */
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static void
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tdesc_end_arch (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, const char *body_text)
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{
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struct tdesc_parsing_data *data = user_data;
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const struct bfd_arch_info *arch;
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arch = bfd_scan_arch (body_text);
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if (arch == NULL)
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gdb_xml_error (parser, _("Target description specified unknown "
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"architecture \"%s\""), body_text);
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set_tdesc_architecture (data->tdesc, arch);
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}
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/* Handle the end of an <osabi> element and its value. */
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static void
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tdesc_end_osabi (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, const char *body_text)
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{
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struct tdesc_parsing_data *data = user_data;
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enum gdb_osabi osabi;
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osabi = osabi_from_tdesc_string (body_text);
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if (osabi == GDB_OSABI_UNKNOWN)
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warning (_("Target description specified unknown osabi \"%s\""),
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body_text);
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else
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set_tdesc_osabi (data->tdesc, osabi);
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}
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/* Handle the end of a <compatible> element and its value. */
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static void
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tdesc_end_compatible (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, const char *body_text)
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{
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struct tdesc_parsing_data *data = user_data;
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const struct bfd_arch_info *arch;
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arch = bfd_scan_arch (body_text);
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tdesc_add_compatible (data->tdesc, arch);
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}
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/* Handle the start of a <target> element. */
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static void
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tdesc_start_target (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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char *version = xml_find_attribute (attributes, "version")->value;
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if (strcmp (version, "1.0") != 0)
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gdb_xml_error (parser,
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_("Target description has unsupported version \"%s\""),
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version);
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}
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/* Handle the start of a <feature> element. */
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static void
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tdesc_start_feature (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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char *name = xml_find_attribute (attributes, "name")->value;
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data->current_feature = tdesc_create_feature (data->tdesc, name);
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}
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/* Handle the start of a <reg> element. Fill in the optional
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attributes and attach it to the containing feature. */
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static void
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tdesc_start_reg (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
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int ix = 0, length;
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char *name, *group, *type;
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int bitsize, regnum, save_restore;
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length = VEC_length (gdb_xml_value_s, attributes);
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name = attrs[ix++].value;
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bitsize = * (ULONGEST *) attrs[ix++].value;
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if (ix < length && strcmp (attrs[ix].name, "regnum") == 0)
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regnum = * (ULONGEST *) attrs[ix++].value;
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else
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regnum = data->next_regnum;
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if (ix < length && strcmp (attrs[ix].name, "type") == 0)
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type = attrs[ix++].value;
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else
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type = "int";
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if (ix < length && strcmp (attrs[ix].name, "group") == 0)
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group = attrs[ix++].value;
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else
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group = NULL;
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if (ix < length && strcmp (attrs[ix].name, "save-restore") == 0)
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save_restore = * (ULONGEST *) attrs[ix++].value;
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else
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save_restore = 1;
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if (strcmp (type, "int") != 0
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&& strcmp (type, "float") != 0
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&& tdesc_named_type (data->current_feature, type) == NULL)
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gdb_xml_error (parser, _("Register \"%s\" has unknown type \"%s\""),
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name, type);
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tdesc_create_reg (data->current_feature, name, regnum, save_restore, group,
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bitsize, type);
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data->next_regnum = regnum + 1;
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}
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/* Handle the start of a <union> element. Initialize the type and
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record it with the current feature. */
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static void
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tdesc_start_union (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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char *id = xml_find_attribute (attributes, "id")->value;
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data->current_type = tdesc_create_union (data->current_feature, id);
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data->current_type_size = 0;
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data->current_type_is_flags = 0;
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}
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/* Handle the start of a <struct> element. Initialize the type and
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record it with the current feature. */
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static void
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tdesc_start_struct (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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char *id = xml_find_attribute (attributes, "id")->value;
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struct tdesc_type *type;
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struct gdb_xml_value *attr;
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type = tdesc_create_struct (data->current_feature, id);
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data->current_type = type;
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data->current_type_size = 0;
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data->current_type_is_flags = 0;
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attr = xml_find_attribute (attributes, "size");
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if (attr != NULL)
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{
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int size = (int) * (ULONGEST *) attr->value;
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tdesc_set_struct_size (type, size);
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data->current_type_size = size;
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}
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}
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static void
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tdesc_start_flags (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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char *id = xml_find_attribute (attributes, "id")->value;
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int length = (int) * (ULONGEST *)
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xml_find_attribute (attributes, "size")->value;
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struct tdesc_type *type;
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type = tdesc_create_flags (data->current_feature, id, length);
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data->current_type = type;
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data->current_type_size = 0;
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data->current_type_is_flags = 1;
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}
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/* Handle the start of a <field> element. Attach the field to the
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current struct or union. */
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static void
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tdesc_start_field (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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struct gdb_xml_value *attr;
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struct tdesc_type *field_type;
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char *field_name, *field_type_id;
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int start, end;
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field_name = xml_find_attribute (attributes, "name")->value;
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attr = xml_find_attribute (attributes, "type");
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if (attr != NULL)
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field_type_id = attr->value;
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else
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field_type_id = NULL;
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attr = xml_find_attribute (attributes, "start");
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if (attr != NULL)
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start = * (ULONGEST *) attr->value;
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else
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start = -1;
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attr = xml_find_attribute (attributes, "end");
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if (attr != NULL)
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end = * (ULONGEST *) attr->value;
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else
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end = -1;
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if (field_type_id != NULL)
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{
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if (data->current_type_is_flags)
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gdb_xml_error (parser, _("Cannot add typed field \"%s\" to flags"),
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field_name);
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if (data->current_type_size != 0)
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gdb_xml_error (parser,
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_("Explicitly sized type can not "
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"contain non-bitfield \"%s\""),
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field_name);
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field_type = tdesc_named_type (data->current_feature, field_type_id);
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if (field_type == NULL)
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gdb_xml_error (parser, _("Field \"%s\" references undefined "
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"type \"%s\""),
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field_name, field_type_id);
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tdesc_add_field (data->current_type, field_name, field_type);
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}
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else if (start != -1 && end != -1)
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{
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struct tdesc_type *t = data->current_type;
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if (data->current_type_is_flags)
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tdesc_add_flag (t, start, field_name);
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else
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{
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if (data->current_type_size == 0)
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gdb_xml_error (parser,
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_("Implicitly sized type can "
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"not contain bitfield \"%s\""),
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field_name);
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if (end >= 64)
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gdb_xml_error (parser,
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_("Bitfield \"%s\" goes past "
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"64 bits (unsupported)"),
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field_name);
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/* Assume that the bit numbering in XML is "lsb-zero". Most
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architectures other than PowerPC use this ordering. In
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the future, we can add an XML tag to indicate "msb-zero"
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numbering. */
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if (start > end)
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gdb_xml_error (parser, _("Bitfield \"%s\" has start after end"),
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field_name);
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if (end >= data->current_type_size * TARGET_CHAR_BIT)
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gdb_xml_error (parser,
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_("Bitfield \"%s\" does not fit in struct"));
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tdesc_add_bitfield (t, field_name, start, end);
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}
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}
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else
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gdb_xml_error (parser, _("Field \"%s\" has neither type nor bit position"),
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field_name);
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}
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/* Handle the start of a <vector> element. Initialize the type and
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record it with the current feature. */
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static void
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tdesc_start_vector (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data, VEC(gdb_xml_value_s) *attributes)
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{
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struct tdesc_parsing_data *data = user_data;
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struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
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struct tdesc_type *field_type;
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char *id, *field_type_id;
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int count;
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id = attrs[0].value;
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field_type_id = attrs[1].value;
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count = * (ULONGEST *) attrs[2].value;
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field_type = tdesc_named_type (data->current_feature, field_type_id);
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if (field_type == NULL)
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gdb_xml_error (parser, _("Vector \"%s\" references undefined type \"%s\""),
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id, field_type_id);
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tdesc_create_vector (data->current_feature, id, field_type, count);
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}
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/* The elements and attributes of an XML target description. */
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static const struct gdb_xml_attribute field_attributes[] = {
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{ "name", GDB_XML_AF_NONE, NULL, NULL },
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{ "type", GDB_XML_AF_OPTIONAL, NULL, NULL },
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{ "start", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
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{ "end", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element struct_union_children[] = {
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{ "field", field_attributes, NULL, GDB_XML_EF_REPEATABLE,
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tdesc_start_field, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute reg_attributes[] = {
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{ "name", GDB_XML_AF_NONE, NULL, NULL },
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{ "bitsize", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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{ "regnum", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL },
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{ "type", GDB_XML_AF_OPTIONAL, NULL, NULL },
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{ "group", GDB_XML_AF_OPTIONAL, NULL, NULL },
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{ "save-restore", GDB_XML_AF_OPTIONAL,
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gdb_xml_parse_attr_enum, gdb_xml_enums_boolean },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute struct_union_attributes[] = {
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{ "id", GDB_XML_AF_NONE, NULL, NULL },
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{ "size", GDB_XML_AF_OPTIONAL, gdb_xml_parse_attr_ulongest, NULL},
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute flags_attributes[] = {
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{ "id", GDB_XML_AF_NONE, NULL, NULL },
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{ "size", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL},
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute vector_attributes[] = {
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{ "id", GDB_XML_AF_NONE, NULL, NULL },
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{ "type", GDB_XML_AF_NONE, NULL, NULL },
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{ "count", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute feature_attributes[] = {
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{ "name", GDB_XML_AF_NONE, NULL, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element feature_children[] = {
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{ "reg", reg_attributes, NULL,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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tdesc_start_reg, NULL },
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{ "struct", struct_union_attributes, struct_union_children,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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tdesc_start_struct, NULL },
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{ "union", struct_union_attributes, struct_union_children,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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tdesc_start_union, NULL },
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{ "flags", flags_attributes, struct_union_children,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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tdesc_start_flags, NULL },
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{ "vector", vector_attributes, NULL,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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tdesc_start_vector, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_attribute target_attributes[] = {
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{ "version", GDB_XML_AF_NONE, NULL, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element target_children[] = {
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{ "architecture", NULL, NULL, GDB_XML_EF_OPTIONAL,
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NULL, tdesc_end_arch },
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{ "osabi", NULL, NULL, GDB_XML_EF_OPTIONAL,
|
||
NULL, tdesc_end_osabi },
|
||
{ "compatible", NULL, NULL, GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
|
||
NULL, tdesc_end_compatible },
|
||
{ "feature", feature_attributes, feature_children,
|
||
GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
|
||
tdesc_start_feature, NULL },
|
||
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
|
||
};
|
||
|
||
static const struct gdb_xml_element tdesc_elements[] = {
|
||
{ "target", target_attributes, target_children, GDB_XML_EF_NONE,
|
||
tdesc_start_target, NULL },
|
||
{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
|
||
};
|
||
|
||
/* Parse DOCUMENT into a target description and return it. */
|
||
|
||
static struct target_desc *
|
||
tdesc_parse_xml (const char *document, xml_fetch_another fetcher,
|
||
void *fetcher_baton)
|
||
{
|
||
struct cleanup *back_to, *result_cleanup;
|
||
struct tdesc_parsing_data data;
|
||
struct tdesc_xml_cache *cache;
|
||
char *expanded_text;
|
||
int ix;
|
||
|
||
/* Expand all XInclude directives. */
|
||
expanded_text = xml_process_xincludes (_("target description"),
|
||
document, fetcher, fetcher_baton, 0);
|
||
if (expanded_text == NULL)
|
||
{
|
||
warning (_("Could not load XML target description; ignoring"));
|
||
return NULL;
|
||
}
|
||
|
||
/* Check for an exact match in the list of descriptions we have
|
||
previously parsed. strcmp is a slightly inefficient way to
|
||
do this; an SHA-1 checksum would work as well. */
|
||
for (ix = 0; VEC_iterate (tdesc_xml_cache_s, xml_cache, ix, cache); ix++)
|
||
if (strcmp (cache->xml_document, expanded_text) == 0)
|
||
{
|
||
xfree (expanded_text);
|
||
return cache->tdesc;
|
||
}
|
||
|
||
back_to = make_cleanup (null_cleanup, NULL);
|
||
|
||
memset (&data, 0, sizeof (struct tdesc_parsing_data));
|
||
data.tdesc = allocate_target_description ();
|
||
result_cleanup = make_cleanup_free_target_description (data.tdesc);
|
||
make_cleanup (xfree, expanded_text);
|
||
|
||
if (gdb_xml_parse_quick (_("target description"), "gdb-target.dtd",
|
||
tdesc_elements, expanded_text, &data) == 0)
|
||
{
|
||
/* Parsed successfully. */
|
||
struct tdesc_xml_cache new_cache;
|
||
|
||
new_cache.xml_document = expanded_text;
|
||
new_cache.tdesc = data.tdesc;
|
||
VEC_safe_push (tdesc_xml_cache_s, xml_cache, &new_cache);
|
||
discard_cleanups (result_cleanup);
|
||
do_cleanups (back_to);
|
||
return data.tdesc;
|
||
}
|
||
else
|
||
{
|
||
warning (_("Could not load XML target description; ignoring"));
|
||
do_cleanups (back_to);
|
||
return NULL;
|
||
}
|
||
}
|
||
#endif /* HAVE_LIBEXPAT */
|
||
|
||
|
||
/* Read an XML target description from FILENAME. Parse it, and return
|
||
the parsed description. */
|
||
|
||
const struct target_desc *
|
||
file_read_description_xml (const char *filename)
|
||
{
|
||
struct target_desc *tdesc;
|
||
char *tdesc_str;
|
||
struct cleanup *back_to;
|
||
char *dirname;
|
||
|
||
tdesc_str = xml_fetch_content_from_file (filename, NULL);
|
||
if (tdesc_str == NULL)
|
||
{
|
||
warning (_("Could not open \"%s\""), filename);
|
||
return NULL;
|
||
}
|
||
|
||
back_to = make_cleanup (xfree, tdesc_str);
|
||
|
||
dirname = ldirname (filename);
|
||
if (dirname != NULL)
|
||
make_cleanup (xfree, dirname);
|
||
|
||
tdesc = tdesc_parse_xml (tdesc_str, xml_fetch_content_from_file, dirname);
|
||
do_cleanups (back_to);
|
||
|
||
return tdesc;
|
||
}
|
||
|
||
/* Read a string representation of available features from the target,
|
||
using TARGET_OBJECT_AVAILABLE_FEATURES. The returned string is
|
||
malloc allocated and NUL-terminated. NAME should be a non-NULL
|
||
string identifying the XML document we want; the top level document
|
||
is "target.xml". Other calls may be performed for the DTD or
|
||
for <xi:include>. */
|
||
|
||
static char *
|
||
fetch_available_features_from_target (const char *name, void *baton_)
|
||
{
|
||
struct target_ops *ops = baton_;
|
||
|
||
/* Read this object as a string. This ensures that a NUL
|
||
terminator is added. */
|
||
return target_read_stralloc (ops,
|
||
TARGET_OBJECT_AVAILABLE_FEATURES,
|
||
name);
|
||
}
|
||
|
||
|
||
/* Read an XML target description using OPS. Parse it, and return the
|
||
parsed description. */
|
||
|
||
const struct target_desc *
|
||
target_read_description_xml (struct target_ops *ops)
|
||
{
|
||
struct target_desc *tdesc;
|
||
char *tdesc_str;
|
||
struct cleanup *back_to;
|
||
|
||
tdesc_str = fetch_available_features_from_target ("target.xml", ops);
|
||
if (tdesc_str == NULL)
|
||
return NULL;
|
||
|
||
back_to = make_cleanup (xfree, tdesc_str);
|
||
tdesc = tdesc_parse_xml (tdesc_str,
|
||
fetch_available_features_from_target,
|
||
ops);
|
||
do_cleanups (back_to);
|
||
|
||
return tdesc;
|
||
}
|