1 /* Functions that provide the mechanism to parse a syscall XML file
4 Copyright (C) 2009-2019 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "xml-support.h"
24 #include "xml-syscall.h"
27 /* For the struct syscall definition. */
30 #include "filenames.h"
34 /* Dummy functions to indicate that there's no support for fetching
35 syscalls information. */
38 syscall_warn_user (void)
40 static int have_warned
= 0;
44 warning (_("Can not parse XML syscalls information; XML support was "
45 "disabled at compile time."));
50 set_xml_syscall_file_name (struct gdbarch
*gdbarch
, const char *name
)
56 get_syscall_by_number (struct gdbarch
*gdbarch
,
57 int syscall_number
, struct syscall
*s
)
60 s
->number
= syscall_number
;
65 get_syscalls_by_name (struct gdbarch
*gdbarch
, const char *syscall_name
,
66 std::vector
<int> *syscall_numbers
)
73 get_syscall_names (struct gdbarch
*gdbarch
)
80 get_syscalls_by_group (struct gdbarch
*gdbarch
, const char *group
,
81 std::vector
<int> *syscall_numbers
)
88 get_syscall_group_names (struct gdbarch
*gdbarch
)
94 #else /* ! HAVE_LIBEXPAT */
96 /* Structure which describes a syscall. */
99 syscall_desc (int number_
, std::string name_
, std::string alias_
)
100 : number (number_
), name (name_
), alias (alias_
)
103 /* The syscall number. */
107 /* The syscall name. */
111 /* An optional alias. */
116 typedef std::unique_ptr
<syscall_desc
> syscall_desc_up
;
118 /* Structure of a syscall group. */
119 struct syscall_group_desc
121 syscall_group_desc (const std::string
&name_
)
125 /* The group name. */
129 /* The syscalls that are part of the group. This is a non-owning
132 std::vector
<syscall_desc
*> syscalls
;
135 typedef std::unique_ptr
<syscall_group_desc
> syscall_group_desc_up
;
137 /* Structure that represents syscalls information. */
142 std::vector
<syscall_desc_up
> syscalls
;
144 /* The syscall groups. */
146 std::vector
<syscall_group_desc_up
> groups
;
148 /* Variable that will hold the last known data-directory. This is
149 useful to know whether we should re-read the XML info for the
152 std::string my_gdb_datadir
;
155 typedef std::unique_ptr
<syscalls_info
> syscalls_info_up
;
157 /* Callback data for syscall information parsing. */
158 struct syscall_parsing_data
160 /* The syscalls_info we are building. */
162 struct syscalls_info
*syscalls_info
;
165 /* Create a new syscall group. Return pointer to the
166 syscall_group_desc structure that represents the new group. */
168 static struct syscall_group_desc
*
169 syscall_group_create_syscall_group_desc (struct syscalls_info
*syscalls_info
,
172 syscall_group_desc
*groupdesc
= new syscall_group_desc (group
);
174 syscalls_info
->groups
.emplace_back (groupdesc
);
179 /* Add a syscall to the group. If group doesn't exist, create it. */
182 syscall_group_add_syscall (struct syscalls_info
*syscalls_info
,
183 struct syscall_desc
*syscall
,
186 /* Search for an existing group. */
187 std::vector
<syscall_group_desc_up
>::iterator it
188 = syscalls_info
->groups
.begin ();
190 for (; it
!= syscalls_info
->groups
.end (); it
++)
192 if ((*it
)->name
== group
)
196 syscall_group_desc
*groupdesc
;
198 if (it
!= syscalls_info
->groups
.end ())
199 groupdesc
= it
->get ();
202 /* No group was found with this name. We must create a new
204 groupdesc
= syscall_group_create_syscall_group_desc (syscalls_info
,
208 groupdesc
->syscalls
.push_back (syscall
);
212 syscall_create_syscall_desc (struct syscalls_info
*syscalls_info
,
213 const char *name
, int number
, const char *alias
,
216 syscall_desc
*sysdesc
= new syscall_desc (number
, name
,
217 alias
!= NULL
? alias
: "");
219 syscalls_info
->syscalls
.emplace_back (sysdesc
);
221 /* Add syscall to its groups. */
224 for (char *group
= strtok (groups
, ",");
226 group
= strtok (NULL
, ","))
227 syscall_group_add_syscall (syscalls_info
, sysdesc
, group
);
231 /* Handle the start of a <syscall> element. */
233 syscall_start_syscall (struct gdb_xml_parser
*parser
,
234 const struct gdb_xml_element
*element
,
236 std::vector
<gdb_xml_value
> &attributes
)
238 struct syscall_parsing_data
*data
= (struct syscall_parsing_data
*) user_data
;
245 for (const gdb_xml_value
&attr
: attributes
)
247 if (strcmp (attr
.name
, "name") == 0)
248 name
= (char *) attr
.value
.get ();
249 else if (strcmp (attr
.name
, "number") == 0)
250 number
= * (ULONGEST
*) attr
.value
.get ();
251 else if (strcmp (attr
.name
, "alias") == 0)
252 alias
= (char *) attr
.value
.get ();
253 else if (strcmp (attr
.name
, "groups") == 0)
254 groups
= (char *) attr
.value
.get ();
256 internal_error (__FILE__
, __LINE__
,
257 _("Unknown attribute name '%s'."), attr
.name
);
261 syscall_create_syscall_desc (data
->syscalls_info
, name
, number
, alias
,
266 /* The elements and attributes of an XML syscall document. */
267 static const struct gdb_xml_attribute syscall_attr
[] = {
268 { "number", GDB_XML_AF_NONE
, gdb_xml_parse_attr_ulongest
, NULL
},
269 { "name", GDB_XML_AF_NONE
, NULL
, NULL
},
270 { "alias", GDB_XML_AF_OPTIONAL
, NULL
, NULL
},
271 { "groups", GDB_XML_AF_OPTIONAL
, NULL
, NULL
},
272 { NULL
, GDB_XML_AF_NONE
, NULL
, NULL
}
275 static const struct gdb_xml_element syscalls_info_children
[] = {
276 { "syscall", syscall_attr
, NULL
,
277 GDB_XML_EF_OPTIONAL
| GDB_XML_EF_REPEATABLE
,
278 syscall_start_syscall
, NULL
},
279 { NULL
, NULL
, NULL
, GDB_XML_EF_NONE
, NULL
, NULL
}
282 static const struct gdb_xml_element syselements
[] = {
283 { "syscalls_info", NULL
, syscalls_info_children
,
284 GDB_XML_EF_NONE
, NULL
, NULL
},
285 { NULL
, NULL
, NULL
, GDB_XML_EF_NONE
, NULL
, NULL
}
288 static struct syscalls_info
*
289 syscall_parse_xml (const char *document
, xml_fetch_another fetcher
,
292 struct syscall_parsing_data data
;
293 syscalls_info_up
sysinfo (new syscalls_info ());
295 data
.syscalls_info
= sysinfo
.get ();
297 if (gdb_xml_parse_quick (_("syscalls info"), NULL
,
298 syselements
, document
, &data
) == 0)
300 /* Parsed successfully. */
301 return sysinfo
.release ();
305 warning (_("Could not load XML syscalls info; ignoring"));
310 /* Function responsible for initializing the information
311 about the syscalls. It reads the XML file and fills the
312 struct syscalls_info with the values.
314 Returns the struct syscalls_info if the file is valid, NULL otherwise. */
315 static struct syscalls_info
*
316 xml_init_syscalls_info (const char *filename
)
318 gdb::optional
<gdb::char_vector
> full_file
319 = xml_fetch_content_from_file (filename
,
320 const_cast<char *>(gdb_datadir
.c_str ()));
324 return syscall_parse_xml (full_file
->data (),
325 xml_fetch_content_from_file
,
326 (void *) ldirname (filename
).c_str ());
329 /* Initializes the syscalls_info structure according to the
332 init_syscalls_info (struct gdbarch
*gdbarch
)
334 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
335 const char *xml_syscall_file
= gdbarch_xml_syscall_file (gdbarch
);
337 /* Should we re-read the XML info for this target? */
338 if (syscalls_info
!= NULL
&& !syscalls_info
->my_gdb_datadir
.empty ()
339 && filename_cmp (syscalls_info
->my_gdb_datadir
.c_str (),
340 gdb_datadir
.c_str ()) != 0)
342 /* The data-directory changed from the last time we used it.
343 It means that we have to re-read the XML info. */
344 delete syscalls_info
;
345 syscalls_info
= NULL
;
346 set_gdbarch_syscalls_info (gdbarch
, NULL
);
349 /* Did we succeed at initializing this? */
350 if (syscalls_info
!= NULL
)
353 syscalls_info
= xml_init_syscalls_info (xml_syscall_file
);
355 /* If there was some error reading the XML file, we initialize
356 gdbarch->syscalls_info anyway, in order to store information
357 about our attempt. */
358 if (syscalls_info
== NULL
)
359 syscalls_info
= new struct syscalls_info ();
361 if (syscalls_info
->syscalls
.empty ())
363 if (xml_syscall_file
!= NULL
)
364 warning (_("Could not load the syscall XML file `%s/%s'."),
365 gdb_datadir
.c_str (), xml_syscall_file
);
367 warning (_("There is no XML file to open."));
369 warning (_("GDB will not be able to display "
370 "syscall names nor to verify if\n"
371 "any provided syscall numbers are valid."));
374 /* Saving the data-directory used to read this XML info. */
375 syscalls_info
->my_gdb_datadir
.assign (gdb_datadir
);
377 set_gdbarch_syscalls_info (gdbarch
, syscalls_info
);
380 /* Search for a syscall group by its name. Return syscall_group_desc
381 structure for the group if found or NULL otherwise. */
383 static struct syscall_group_desc
*
384 syscall_group_get_group_by_name (const struct syscalls_info
*syscalls_info
,
387 if (syscalls_info
== NULL
)
393 /* Search for existing group. */
394 for (const syscall_group_desc_up
&groupdesc
: syscalls_info
->groups
)
396 if (groupdesc
->name
== group
)
397 return groupdesc
.get ();
404 xml_get_syscalls_by_name (struct gdbarch
*gdbarch
, const char *syscall_name
,
405 std::vector
<int> *syscall_numbers
)
407 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
410 if (syscalls_info
!= NULL
&& syscall_name
!= NULL
&& syscall_numbers
!= NULL
)
411 for (const syscall_desc_up
&sysdesc
: syscalls_info
->syscalls
)
412 if (sysdesc
->name
== syscall_name
|| sysdesc
->alias
== syscall_name
)
414 syscall_numbers
->push_back (sysdesc
->number
);
422 xml_get_syscall_name (struct gdbarch
*gdbarch
,
425 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
427 if (syscalls_info
== NULL
428 || syscall_number
< 0)
431 for (const syscall_desc_up
&sysdesc
: syscalls_info
->syscalls
)
432 if (sysdesc
->number
== syscall_number
)
433 return sysdesc
->name
.c_str ();
439 xml_list_of_syscalls (struct gdbarch
*gdbarch
)
441 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
443 if (syscalls_info
== NULL
)
446 int nsyscalls
= syscalls_info
->syscalls
.size ();
447 const char **names
= XNEWVEC (const char *, nsyscalls
+ 1);
450 for (i
= 0; i
< syscalls_info
->syscalls
.size (); i
++)
451 names
[i
] = syscalls_info
->syscalls
[i
]->name
.c_str ();
458 /* Iterate over the syscall_group_desc element to return a list of
459 syscalls that are part of the given group. If the syscall group
460 doesn't exist, return false. */
463 xml_list_syscalls_by_group (struct gdbarch
*gdbarch
, const char *group
,
464 std::vector
<int> *syscalls
)
466 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
467 struct syscall_group_desc
*groupdesc
;
469 if (syscalls_info
== NULL
|| syscalls
== NULL
)
472 groupdesc
= syscall_group_get_group_by_name (syscalls_info
, group
);
473 if (groupdesc
== NULL
)
476 for (const syscall_desc
*sysdesc
: groupdesc
->syscalls
)
477 syscalls
->push_back (sysdesc
->number
);
482 /* Return a NULL terminated list of syscall groups or an empty list, if
483 no syscall group is available. Return NULL, if there is no syscall
484 information available. */
487 xml_list_of_groups (struct gdbarch
*gdbarch
)
489 struct syscalls_info
*syscalls_info
= gdbarch_syscalls_info (gdbarch
);
490 const char **names
= NULL
;
494 if (syscalls_info
== NULL
)
497 ngroups
= syscalls_info
->groups
.size ();
498 names
= (const char**) xmalloc ((ngroups
+ 1) * sizeof (char *));
500 for (i
= 0; i
< syscalls_info
->groups
.size (); i
++)
501 names
[i
] = syscalls_info
->groups
[i
]->name
.c_str ();
509 set_xml_syscall_file_name (struct gdbarch
*gdbarch
, const char *name
)
511 set_gdbarch_xml_syscall_file (gdbarch
, name
);
515 get_syscall_by_number (struct gdbarch
*gdbarch
,
516 int syscall_number
, struct syscall
*s
)
518 init_syscalls_info (gdbarch
);
520 s
->number
= syscall_number
;
521 s
->name
= xml_get_syscall_name (gdbarch
, syscall_number
);
525 get_syscalls_by_name (struct gdbarch
*gdbarch
, const char *syscall_name
,
526 std::vector
<int> *syscall_numbers
)
528 init_syscalls_info (gdbarch
);
530 return xml_get_syscalls_by_name (gdbarch
, syscall_name
, syscall_numbers
);
534 get_syscall_names (struct gdbarch
*gdbarch
)
536 init_syscalls_info (gdbarch
);
538 return xml_list_of_syscalls (gdbarch
);
541 /* See comment in xml-syscall.h. */
544 get_syscalls_by_group (struct gdbarch
*gdbarch
, const char *group
,
545 std::vector
<int> *syscall_numbers
)
547 init_syscalls_info (gdbarch
);
549 return xml_list_syscalls_by_group (gdbarch
, group
, syscall_numbers
);
552 /* See comment in xml-syscall.h. */
555 get_syscall_group_names (struct gdbarch
*gdbarch
)
557 init_syscalls_info (gdbarch
);
559 return xml_list_of_groups (gdbarch
);
562 #endif /* ! HAVE_LIBEXPAT */