433 lines
11 KiB
C
433 lines
11 KiB
C
/* Functions that provide the mechanism to parse a syscall XML file
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and get its values.
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Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
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1998, 1999, 2000, 2001, 2003, 2004, 2005, 2006, 2007, 2008
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Free Software Foundation, Inc.
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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 "gdbtypes.h"
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#include "xml-support.h"
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#include "xml-syscall.h"
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/* For the struct syscall definition. */
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#include "target.h"
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#include "filenames.h"
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#include "gdb_assert.h"
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#ifndef HAVE_LIBEXPAT
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/* Dummy functions to indicate that there's no support for fetching
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syscalls information. */
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static void
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syscall_warn_user (void)
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{
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static int have_warned = 0;
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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 syscalls information; XML support was "
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"disabled at compile time."));
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}
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}
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void
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set_xml_syscall_file_name (const char *name)
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{
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syscall_warn_user ();
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}
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void
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get_syscall_by_number (int syscall_number,
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struct syscall *s)
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{
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syscall_warn_user ();
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s->number = syscall_number;
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s->name = NULL;
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}
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void
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get_syscall_by_name (const char *syscall_name,
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struct syscall *s)
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{
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syscall_warn_user ();
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s->number = UNKNOWN_SYSCALL;
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s->name = syscall_name;
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}
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const char **
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get_syscall_names (void)
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{
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syscall_warn_user ();
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return NULL;
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}
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#else /* ! HAVE_LIBEXPAT */
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/* Structure which describes a syscall. */
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typedef struct syscall_desc
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{
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/* The syscall number. */
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int number;
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/* The syscall name. */
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char *name;
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} *syscall_desc_p;
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DEF_VEC_P(syscall_desc_p);
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/* Structure that represents syscalls information. */
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struct syscalls_info
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{
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/* The syscalls. */
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VEC(syscall_desc_p) *syscalls;
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};
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/* Callback data for syscall information parsing. */
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struct syscall_parsing_data
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{
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/* The syscalls_info we are building. */
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struct syscalls_info *sysinfo;
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};
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/* Structure used to store information about the available syscalls in
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the system. */
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static const struct syscalls_info *_sysinfo = NULL;
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/* A flag to tell if we already initialized the structure above. */
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static int have_initialized_sysinfo = 0;
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/* The filename of the syscall's XML. */
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static const char *xml_syscall_file = NULL;
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static struct syscalls_info *
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allocate_syscalls_info (void)
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{
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return XZALLOC (struct syscalls_info);
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}
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static void
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sysinfo_free_syscalls_desc (struct syscall_desc *sd)
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{
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xfree (sd->name);
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}
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static void
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free_syscalls_info (void *arg)
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{
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struct syscalls_info *sysinfo = arg;
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struct syscall_desc *sysdesc;
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int i;
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for (i = 0;
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VEC_iterate (syscall_desc_p, sysinfo->syscalls, i, sysdesc);
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i++)
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sysinfo_free_syscalls_desc (sysdesc);
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VEC_free (syscall_desc_p, sysinfo->syscalls);
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xfree (sysinfo);
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}
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struct cleanup *
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make_cleanup_free_syscalls_info (struct syscalls_info *sysinfo)
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{
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return make_cleanup (free_syscalls_info, sysinfo);
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}
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static void
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syscall_create_syscall_desc (struct syscalls_info *sysinfo,
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const char *name, int number)
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{
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struct syscall_desc *sysdesc = XZALLOC (struct syscall_desc);
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sysdesc->name = xstrdup (name);
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sysdesc->number = number;
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VEC_safe_push (syscall_desc_p, sysinfo->syscalls, sysdesc);
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}
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/* Handle the start of a <syscalls_info> element. */
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static void
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syscall_start_syscalls_info (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data,
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VEC(gdb_xml_value_s) *attributes)
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{
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struct syscall_parsing_data *data = user_data;
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struct syscalls_info *sysinfo = data->sysinfo;
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}
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/* Handle the start of a <syscall> element. */
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static void
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syscall_start_syscall (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 syscall_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 len, i;
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/* syscall info. */
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char *name = NULL;
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int number = 0;
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len = VEC_length (gdb_xml_value_s, attributes);
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for (i = 0; i < len; i++)
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{
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if (strcmp (attrs[i].name, "name") == 0)
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name = attrs[i].value;
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else if (strcmp (attrs[i].name, "number") == 0)
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number = * (ULONGEST *) attrs[i].value;
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else
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internal_error (__FILE__, __LINE__,
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_("Unknown attribute name '%s'."), attrs[i].name);
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}
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syscall_create_syscall_desc (data->sysinfo, name, number);
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}
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/* The elements and attributes of an XML syscall document. */
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static const struct gdb_xml_attribute syscall_attr[] = {
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{ "number", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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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 syscalls_info_children[] = {
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{ "syscall", syscall_attr, NULL,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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syscall_start_syscall, 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_element syselements[] = {
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{ "syscalls_info", NULL, syscalls_info_children,
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GDB_XML_EF_NONE, syscall_start_syscalls_info, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static struct syscalls_info *
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syscall_parse_xml (const char *document, xml_fetch_another fetcher,
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void *fetcher_baton)
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{
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struct cleanup *result_cleanup;
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struct gdb_xml_parser *parser;
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struct syscall_parsing_data data;
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char *expanded_text;
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int i;
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parser = gdb_xml_create_parser_and_cleanup (_("syscalls info"),
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syselements, &data);
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memset (&data, 0, sizeof (struct syscall_parsing_data));
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data.sysinfo = allocate_syscalls_info ();
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result_cleanup = make_cleanup_free_syscalls_info (data.sysinfo);
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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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return data.sysinfo;
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}
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else
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{
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warning (_("Could not load XML syscalls info; ignoring"));
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do_cleanups (result_cleanup);
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return NULL;
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}
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}
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/* Function responsible for initializing the information
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about the syscalls. It reads the XML file and fills the
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struct syscalls_info with the values.
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Returns the struct syscalls_info if the file is valid, NULL otherwise. */
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static const struct syscalls_info *
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xml_init_syscalls_info (const char *filename)
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{
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char *full_file;
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char *dirname;
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struct syscalls_info *sysinfo;
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struct cleanup *back_to;
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full_file = xml_fetch_content_from_file (filename, gdb_datadir);
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if (full_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 (xfree, full_file);
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dirname = ldirname (filename);
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if (dirname != NULL)
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make_cleanup (xfree, dirname);
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sysinfo = syscall_parse_xml (full_file, xml_fetch_content_from_file, dirname);
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do_cleanups (back_to);
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return sysinfo;
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}
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/* Initializes the syscalls_info structure according to the
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architecture. */
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static void
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init_sysinfo (void)
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{
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/* Did we already try to initialize the structure? */
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if (have_initialized_sysinfo)
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return;
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/* if (xml_syscall_file == NULL)
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internal_error (__FILE__, __LINE__,
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_("This architecture has not set the XML syscall file "
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"name. This is a bug and should not happen; please "
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"report it.")); */
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_sysinfo = xml_init_syscalls_info (xml_syscall_file);
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have_initialized_sysinfo = 1;
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if (_sysinfo == NULL)
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{
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if (xml_syscall_file)
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/* The initialization failed. Let's show a warning
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message to the user (just this time) and leave. */
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warning (_("Could not load the syscall XML file `%s'.\n\
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GDB will not be able to display syscall names."), xml_syscall_file);
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else
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/* There's no file to open. Let's warn the user. */
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warning (_("There is no XML file to open.\n\
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GDB will not be able to display syscall names."));
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}
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}
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static int
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xml_get_syscall_number (const struct syscalls_info *sysinfo,
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const char *syscall_name)
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{
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struct syscall_desc *sysdesc;
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int i;
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if (sysinfo == NULL
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|| syscall_name == NULL)
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return UNKNOWN_SYSCALL;
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for (i = 0;
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VEC_iterate(syscall_desc_p, sysinfo->syscalls, i, sysdesc);
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i++)
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if (strcmp (sysdesc->name, syscall_name) == 0)
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return sysdesc->number;
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return UNKNOWN_SYSCALL;
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}
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static const char *
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xml_get_syscall_name (const struct syscalls_info *sysinfo,
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int syscall_number)
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{
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struct syscall_desc *sysdesc;
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int i;
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if (sysinfo == NULL
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|| syscall_number < 0)
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return NULL;
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for (i = 0;
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VEC_iterate(syscall_desc_p, sysinfo->syscalls, i, sysdesc);
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i++)
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if (sysdesc->number == syscall_number)
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return sysdesc->name;
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return NULL;
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}
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static int
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xml_number_of_syscalls (const struct syscalls_info *sysinfo)
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{
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return (sysinfo == NULL ? 0 : VEC_length (syscall_desc_p,
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sysinfo->syscalls));
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}
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static const char **
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xml_list_of_syscalls (const struct syscalls_info *sysinfo)
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{
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struct syscall_desc *sysdesc;
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const char **names = NULL;
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int nsyscalls;
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int i;
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if (sysinfo == NULL)
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return NULL;
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nsyscalls = VEC_length (syscall_desc_p, sysinfo->syscalls);
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names = xmalloc ((nsyscalls + 1) * sizeof (char *));
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for (i = 0;
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VEC_iterate (syscall_desc_p, sysinfo->syscalls, i, sysdesc);
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i++)
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names[i] = sysdesc->name;
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names[i] = NULL;
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return names;
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}
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void
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set_xml_syscall_file_name (const char *name)
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{
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xml_syscall_file = name;
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}
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void
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get_syscall_by_number (int syscall_number,
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struct syscall *s)
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{
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init_sysinfo ();
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s->number = syscall_number;
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s->name = xml_get_syscall_name (_sysinfo, syscall_number);
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}
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void
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get_syscall_by_name (const char *syscall_name,
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struct syscall *s)
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{
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init_sysinfo ();
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s->number = xml_get_syscall_number (_sysinfo, syscall_name);
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s->name = syscall_name;
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}
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const char **
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get_syscall_names (void)
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{
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init_sysinfo ();
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return xml_list_of_syscalls (_sysinfo);
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}
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#endif /* ! HAVE_LIBEXPAT */
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