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23181151a2
* NEWS: Mention target descriptions, "set tdesc filename", "unset tdesc filename", "show tdesc filename", and qXfer:features:read. * arch-utils.c (choose_architecture_for_target): New function. (gdbarch_info_fill): Call it. * target-descriptions.c (struct property): Make members non-const. (struct target_desc): Add arch member. (target_description_filename): New variable. (target_find_description): Try via XML first. (tdesc_architecture): New. (free_target_description, make_cleanup_free_target_description): New. (set_tdesc_property): Call xstrdup. (set_tdesc_architecture, tdesc_set_cmdlist, tdesc_show_cmdlist) (tdesc_unset_cmdlist, unset_tdesc_cmd, unset_tdesc_filename_cmd) (set_tdesc_cmd, show_tdesc_cmd, set_tdesc_filename_cmd) (show_tdesc_filename_cmd, _initialize_target_descriptions): New. * target-descriptions.h (tdesc_architecture) (make_cleanup_free_target_description, set_tdesc_architecture): New prototypes. * Makefile.in (SFILES): Add xml-tdesc.c. (COMMON_OBS): Add xml-tdesc.o. (target-descriptions.o): Update. (xml-tdesc.o): New rule. * xml-tdesc.c, xml-tdesc.h: New files. * remote.c (PACKET_qXfer_features): New enum. (remote_protocol_features): Add qXfer:features:read. (remote_xfer_partial): Handle TARGET_OBJECT_AVAILABLE_FEATURES. (_initialize_remote): Register qXfer:features:read. * target.h (enum target_object): Add TARGET_OBJECT_AVAILABLE_FEATURES. * features/gdb-target.dtd: New file. * linux-i386-low.c (the_low_target): Set arch_string. * linux-x86-64-low.c (the_low_target): Likewise. * linux-low.c (linux_arch_string): New. (linux_target_ops): Add it. * linux-low.h (struct linux_target_ops): Add arch_string. * server.c (write_qxfer_response): Use const void * for DATA. (get_features_xml): New. (handle_query): Handle qXfer:features:read. Report it for qSupported. * target.h (struct target_ops): Add arch_string method. * gdb.texinfo (Target Descriptions): New section. (General Query Packets): Add QPassSignals anchor. Mention qXfer:features:read under qSupported. Expand mentions of qXfer:memory-map:read and QPassSignals. Document qXfer:features:read.
234 lines
5.7 KiB
C
234 lines
5.7 KiB
C
/* XML target description support for GDB.
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Copyright (C) 2006
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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 2 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, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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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 "gdb_assert.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)
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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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/* 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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};
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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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/* The elements and attributes of an XML target description. */
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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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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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const struct gdb_xml_element tdesc_elements[] = {
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{ "target", NULL, target_children, GDB_XML_EF_NONE,
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NULL, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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/* Parse DOCUMENT into a target description and return it. */
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static struct target_desc *
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tdesc_parse_xml (const char *document)
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{
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struct cleanup *back_to, *result_cleanup;
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struct gdb_xml_parser *parser;
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struct tdesc_parsing_data data;
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memset (&data, 0, sizeof (struct tdesc_parsing_data));
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back_to = make_cleanup (null_cleanup, NULL);
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parser = gdb_xml_create_parser_and_cleanup (_("target description"),
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tdesc_elements, &data);
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data.tdesc = allocate_target_description ();
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result_cleanup = make_cleanup_free_target_description (data.tdesc);
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if (gdb_xml_parse (parser, document) == 0)
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{
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/* Parsed successfully. */
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discard_cleanups (result_cleanup);
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do_cleanups (back_to);
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return data.tdesc;
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}
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else
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{
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warning (_("Could not load XML target description; ignoring"));
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do_cleanups (back_to);
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return NULL;
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}
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}
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#endif /* HAVE_LIBEXPAT */
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/* Close FILE. */
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static void
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do_cleanup_fclose (void *file)
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{
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fclose (file);
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}
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/* Open FILENAME, read all its text into memory, close it, and return
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the text. If something goes wrong, return NULL and warn. */
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static char *
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fetch_xml_from_file (const char *filename)
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{
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FILE *file;
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struct cleanup *back_to;
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char *text;
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size_t len, offset;
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file = fopen (filename, FOPEN_RT);
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if (file == NULL)
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{
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warning (_("Could not open \"%s\""), filename);
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return NULL;
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}
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back_to = make_cleanup (do_cleanup_fclose, file);
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/* Read in the whole file, one chunk at a time. */
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len = 4096;
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offset = 0;
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text = xmalloc (len);
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make_cleanup (free_current_contents, &text);
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while (1)
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{
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size_t bytes_read;
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/* Continue reading where the last read left off. Leave at least
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one byte so that we can NUL-terminate the result. */
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bytes_read = fread (text + offset, 1, len - offset - 1, file);
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if (ferror (file))
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{
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warning (_("Read error from \"%s\""), filename);
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do_cleanups (back_to);
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return NULL;
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}
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offset += bytes_read;
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if (feof (file))
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break;
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len = len * 2;
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text = xrealloc (text, len);
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}
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fclose (file);
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discard_cleanups (back_to);
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text[offset] = '\0';
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return text;
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}
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/* Read an XML target description from FILENAME. Parse it, and return
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the parsed description. */
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const struct target_desc *
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file_read_description_xml (const char *filename)
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{
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struct target_desc *tdesc;
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char *tdesc_str;
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struct cleanup *back_to;
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tdesc_str = fetch_xml_from_file (filename);
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if (tdesc_str == NULL)
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return NULL;
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back_to = make_cleanup (xfree, tdesc_str);
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tdesc = tdesc_parse_xml (tdesc_str);
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do_cleanups (back_to);
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return tdesc;
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}
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/* Read an XML target description using OPS. Parse it, and return the
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parsed description. */
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const struct target_desc *
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target_read_description_xml (struct target_ops *ops)
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{
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struct target_desc *tdesc;
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char *tdesc_str;
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struct cleanup *back_to;
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tdesc_str = target_read_stralloc (ops, TARGET_OBJECT_AVAILABLE_FEATURES,
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"target.xml");
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if (tdesc_str == NULL)
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return NULL;
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back_to = make_cleanup (xfree, tdesc_str);
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tdesc = tdesc_parse_xml (tdesc_str);
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do_cleanups (back_to);
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return tdesc;
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}
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