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/tmp/gdb-8.1/gdb/xml-syscall.c
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1 /* Functions that provide the mechanism to parse a syscall XML file
2 and get its values.
3
4 Copyright (C) 2009-2018 Free Software Foundation, Inc.
5
6 This file is part of GDB.
7
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.
12
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.
17
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/>. */
20
21 #include "defs.h"
22 #include "gdbtypes.h"
23 #include "xml-support.h"
24 #include "xml-syscall.h"
25 #include "gdbarch.h"
26
27 /* For the struct syscall definition. */
28 #include "target.h"
29
30 #include "filenames.h"
31
32 #ifndef HAVE_LIBEXPAT
33
34 /* Dummy functions to indicate that there's no support for fetching
35 syscalls information. */
36
37 static void
38 syscall_warn_user (void)
39 {
40 static int have_warned = 0;
41 if (!have_warned)
42 {
43 have_warned = 1;
44 warning (_("Can not parse XML syscalls information; XML support was "
45 "disabled at compile time."));
46 }
47 }
48
49 void
50 set_xml_syscall_file_name (struct gdbarch *gdbarch, const char *name)
51 {
52 return;
53 }
54
55 void
56 get_syscall_by_number (struct gdbarch *gdbarch,
57 int syscall_number, struct syscall *s)
58 {
59 syscall_warn_user ();
60 s->number = syscall_number;
61 s->name = NULL;
62 }
63
64 void
65 get_syscall_by_name (struct gdbarch *gdbarch, const char *syscall_name,
66 struct syscall *s)
67 {
68 syscall_warn_user ();
69 s->number = UNKNOWN_SYSCALL;
70 s->name = syscall_name;
71 }
72
73 const char **
74 get_syscall_names (struct gdbarch *gdbarch)
75 {
76 syscall_warn_user ();
77 return NULL;
78 }
79
80 struct syscall *
81 get_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
82 {
83 syscall_warn_user ();
84 return NULL;
85 }
86
87 const char **
88 get_syscall_group_names (struct gdbarch *gdbarch)
89 {
90 syscall_warn_user ();
91 return NULL;
92 }
93
94 #else /* ! HAVE_LIBEXPAT */
95
96 /* Structure which describes a syscall. */
97 struct syscall_desc
98 {
99 syscall_desc (int number_, std::string name_)
100 : number (number_), name (name_)
101 {}
102
103 /* The syscall number. */
104
105 int number;
106
107 /* The syscall name. */
108
109 std::string name;
110 };
111
112 typedef std::unique_ptr<syscall_desc> syscall_desc_up;
113
114 /* Structure of a syscall group. */
115 struct syscall_group_desc
116 {
117 syscall_group_desc (const std::string &name_)
118 : name (name_)
119 {}
120
121 /* The group name. */
122
123 std::string name;
124
125 /* The syscalls that are part of the group. This is a non-owning
126 reference. */
127
128 std::vector<syscall_desc *> syscalls;
129 };
130
131 typedef std::unique_ptr<syscall_group_desc> syscall_group_desc_up;
132
133 /* Structure that represents syscalls information. */
134 struct syscalls_info
135 {
136 /* The syscalls. */
137
138 std::vector<syscall_desc_up> syscalls;
139
140 /* The syscall groups. */
141
142 std::vector<syscall_group_desc_up> groups;
143
144 /* Variable that will hold the last known data-directory. This is
145 useful to know whether we should re-read the XML info for the
146 target. */
147
148 std::string my_gdb_datadir;
149 };
150
151 typedef std::unique_ptr<syscalls_info> syscalls_info_up;
152
153 /* Callback data for syscall information parsing. */
154 struct syscall_parsing_data
155 {
156 /* The syscalls_info we are building. */
157
158 struct syscalls_info *syscalls_info;
159 };
160
161 /* Create a new syscall group. Return pointer to the
162 syscall_group_desc structure that represents the new group. */
163
164 static struct syscall_group_desc *
165 syscall_group_create_syscall_group_desc (struct syscalls_info *syscalls_info,
166 const char *group)
167 {
168 syscall_group_desc *groupdesc = new syscall_group_desc (group);
169
170 syscalls_info->groups.emplace_back (groupdesc);
171
172 return groupdesc;
173 }
174
175 /* Add a syscall to the group. If group doesn't exist, create it. */
176
177 static void
178 syscall_group_add_syscall (struct syscalls_info *syscalls_info,
179 struct syscall_desc *syscall,
180 const char *group)
181 {
182 /* Search for an existing group. */
183 std::vector<syscall_group_desc_up>::iterator it
184 = syscalls_info->groups.begin ();
185
186 for (; it != syscalls_info->groups.end (); it++)
187 {
188 if ((*it)->name == group)
189 break;
190 }
191
192 syscall_group_desc *groupdesc;
193
194 if (it != syscalls_info->groups.end ())
195 groupdesc = it->get ();
196 else
197 {
198 /* No group was found with this name. We must create a new
199 one. */
200 groupdesc = syscall_group_create_syscall_group_desc (syscalls_info,
201 group);
202 }
203
204 groupdesc->syscalls.push_back (syscall);
205 }
206
207 static void
208 syscall_create_syscall_desc (struct syscalls_info *syscalls_info,
209 const char *name, int number,
210 char *groups)
211 {
212 syscall_desc *sysdesc = new syscall_desc (number, name);
213
214 syscalls_info->syscalls.emplace_back (sysdesc);
215
216 /* Add syscall to its groups. */
217 if (groups != NULL)
218 {
219 for (char *group = strtok (groups, ",");
220 group != NULL;
221 group = strtok (NULL, ","))
222 syscall_group_add_syscall (syscalls_info, sysdesc, group);
223 }
224 }
225
226 /* Handle the start of a <syscall> element. */
227 static void
228 syscall_start_syscall (struct gdb_xml_parser *parser,
229 const struct gdb_xml_element *element,
230 void *user_data, VEC(gdb_xml_value_s) *attributes)
231 {
232 struct syscall_parsing_data *data = (struct syscall_parsing_data *) user_data;
233 struct gdb_xml_value *attrs = VEC_address (gdb_xml_value_s, attributes);
234 int len, i;
235 /* syscall info. */
236 char *name = NULL;
237 int number = 0;
238 char *groups = NULL;
239
240 len = VEC_length (gdb_xml_value_s, attributes);
241
242 for (i = 0; i < len; i++)
243 {
244 if (strcmp (attrs[i].name, "name") == 0)
245 name = (char *) attrs[i].value;
246 else if (strcmp (attrs[i].name, "number") == 0)
247 number = * (ULONGEST *) attrs[i].value;
248 else if (strcmp (attrs[i].name, "groups") == 0)
249 groups = (char *) attrs[i].value;
250 else
251 internal_error (__FILE__, __LINE__,
252 _("Unknown attribute name '%s'."), attrs[i].name);
253 }
254
255 gdb_assert (name);
256 syscall_create_syscall_desc (data->syscalls_info, name, number, groups);
257 }
258
259
260 /* The elements and attributes of an XML syscall document. */
261 static const struct gdb_xml_attribute syscall_attr[] = {
262 { "number", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
263 { "name", GDB_XML_AF_NONE, NULL, NULL },
264 { "groups", GDB_XML_AF_OPTIONAL, NULL, NULL },
265 { NULL, GDB_XML_AF_NONE, NULL, NULL }
266 };
267
268 static const struct gdb_xml_element syscalls_info_children[] = {
269 { "syscall", syscall_attr, NULL,
270 GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
271 syscall_start_syscall, NULL },
272 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
273 };
274
275 static const struct gdb_xml_element syselements[] = {
276 { "syscalls_info", NULL, syscalls_info_children,
277 GDB_XML_EF_NONE, NULL, NULL },
278 { NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
279 };
280
281 static struct syscalls_info *
282 syscall_parse_xml (const char *document, xml_fetch_another fetcher,
283 void *fetcher_baton)
284 {
285 struct syscall_parsing_data data;
286 syscalls_info_up sysinfo (new syscalls_info ());
287
288 data.syscalls_info = sysinfo.get ();
289
290 if (gdb_xml_parse_quick (_("syscalls info"), NULL,
291 syselements, document, &data) == 0)
292 {
293 /* Parsed successfully. */
294 return sysinfo.release ();
295 }
296 else
297 {
298 warning (_("Could not load XML syscalls info; ignoring"));
299 return NULL;
300 }
301 }
302
303 /* Function responsible for initializing the information
304 about the syscalls. It reads the XML file and fills the
305 struct syscalls_info with the values.
306
307 Returns the struct syscalls_info if the file is valid, NULL otherwise. */
308 static struct syscalls_info *
309 xml_init_syscalls_info (const char *filename)
310 {
311 gdb::unique_xmalloc_ptr<char> full_file
312 = xml_fetch_content_from_file (filename, gdb_datadir);
313 if (full_file == NULL)
314 return NULL;
315
316 return syscall_parse_xml (full_file.get (),
317 xml_fetch_content_from_file,
318 (void *) ldirname (filename).c_str ());
319 }
320
321 /* Initializes the syscalls_info structure according to the
322 architecture. */
323 static void
324 init_syscalls_info (struct gdbarch *gdbarch)
325 {
326 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
327 const char *xml_syscall_file = gdbarch_xml_syscall_file (gdbarch);
328
329 /* Should we re-read the XML info for this target? */
330 if (syscalls_info != NULL && !syscalls_info->my_gdb_datadir.empty ()
331 && filename_cmp (syscalls_info->my_gdb_datadir.c_str (),
332 gdb_datadir) != 0)
333 {
334 /* The data-directory changed from the last time we used it.
335 It means that we have to re-read the XML info. */
336 delete syscalls_info;
337 syscalls_info = NULL;
338 set_gdbarch_syscalls_info (gdbarch, NULL);
339 }
340
341 /* Did we succeed at initializing this? */
342 if (syscalls_info != NULL)
343 return;
344
345 syscalls_info = xml_init_syscalls_info (xml_syscall_file);
346
347 /* If there was some error reading the XML file, we initialize
348 gdbarch->syscalls_info anyway, in order to store information
349 about our attempt. */
350 if (syscalls_info == NULL)
351 syscalls_info = new struct syscalls_info ();
352
353 if (syscalls_info->syscalls.empty ())
354 {
355 if (xml_syscall_file != NULL)
356 warning (_("Could not load the syscall XML file `%s/%s'."),
357 gdb_datadir, xml_syscall_file);
358 else
359 warning (_("There is no XML file to open."));
360
361 warning (_("GDB will not be able to display "
362 "syscall names nor to verify if\n"
363 "any provided syscall numbers are valid."));
364 }
365
366 /* Saving the data-directory used to read this XML info. */
367 syscalls_info->my_gdb_datadir.assign (gdb_datadir);
368
369 set_gdbarch_syscalls_info (gdbarch, syscalls_info);
370 }
371
372 /* Search for a syscall group by its name. Return syscall_group_desc
373 structure for the group if found or NULL otherwise. */
374
375 static struct syscall_group_desc *
376 syscall_group_get_group_by_name (const struct syscalls_info *syscalls_info,
377 const char *group)
378 {
379 if (syscalls_info == NULL)
380 return NULL;
381
382 if (group == NULL)
383 return NULL;
384
385 /* Search for existing group. */
386 for (const syscall_group_desc_up &groupdesc : syscalls_info->groups)
387 {
388 if (groupdesc->name == group)
389 return groupdesc.get ();
390 }
391
392 return NULL;
393 }
394
395 static int
396 xml_get_syscall_number (struct gdbarch *gdbarch,
397 const char *syscall_name)
398 {
399 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
400
401 if (syscalls_info == NULL
402 || syscall_name == NULL)
403 return UNKNOWN_SYSCALL;
404
405 for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
406 if (sysdesc->name == syscall_name)
407 return sysdesc->number;
408
409 return UNKNOWN_SYSCALL;
410 }
411
412 static const char *
413 xml_get_syscall_name (struct gdbarch *gdbarch,
414 int syscall_number)
415 {
416 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
417
418 if (syscalls_info == NULL
419 || syscall_number < 0)
420 return NULL;
421
422 for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
423 if (sysdesc->number == syscall_number)
424 return sysdesc->name.c_str ();
425
426 return NULL;
427 }
428
429 static const char **
430 xml_list_of_syscalls (struct gdbarch *gdbarch)
431 {
432 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
433
434 if (syscalls_info == NULL)
435 return NULL;
436
437 int nsyscalls = syscalls_info->syscalls.size ();
438 const char **names = XNEWVEC (const char *, nsyscalls + 1);
439
440 int i;
441 for (i = 0; i < syscalls_info->syscalls.size (); i++)
442 names[i] = syscalls_info->syscalls[i]->name.c_str ();
443
444 names[i] = NULL;
445
446 return names;
447 }
448
449 /* Iterate over the syscall_group_desc element to return a list of
450 syscalls that are part of the given group, terminated by an empty
451 element. If the syscall group doesn't exist, return NULL. */
452
453 static struct syscall *
454 xml_list_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
455 {
456 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
457 struct syscall_group_desc *groupdesc;
458 struct syscall *syscalls = NULL;
459 int nsyscalls;
460 int i;
461
462 if (syscalls_info == NULL)
463 return NULL;
464
465 groupdesc = syscall_group_get_group_by_name (syscalls_info, group);
466 if (groupdesc == NULL)
467 return NULL;
468
469 nsyscalls = groupdesc->syscalls.size ();
470 syscalls = (struct syscall*) xmalloc ((nsyscalls + 1)
471 * sizeof (struct syscall));
472
473 for (i = 0; i < groupdesc->syscalls.size (); i++)
474 {
475 syscalls[i].name = groupdesc->syscalls[i]->name.c_str ();
476 syscalls[i].number = groupdesc->syscalls[i]->number;
477 }
478
479 /* Add final element marker. */
480 syscalls[i].name = NULL;
481 syscalls[i].number = 0;
482
483 return syscalls;
484 }
485
486 /* Return a NULL terminated list of syscall groups or an empty list, if
487 no syscall group is available. Return NULL, if there is no syscall
488 information available. */
489
490 static const char **
491 xml_list_of_groups (struct gdbarch *gdbarch)
492 {
493 struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
494 const char **names = NULL;
495 int ngroups;
496 int i;
497
498 if (syscalls_info == NULL)
499 return NULL;
500
501 ngroups = syscalls_info->groups.size ();
502 names = (const char**) xmalloc ((ngroups + 1) * sizeof (char *));
503
504 for (i = 0; i < syscalls_info->groups.size (); i++)
505 names[i] = syscalls_info->groups[i]->name.c_str ();
506
507 names[i] = NULL;
508
509 return names;
510 }
511
512 void
513 set_xml_syscall_file_name (struct gdbarch *gdbarch, const char *name)
514 {
515 set_gdbarch_xml_syscall_file (gdbarch, name);
516 }
517
518 void
519 get_syscall_by_number (struct gdbarch *gdbarch,
520 int syscall_number, struct syscall *s)
521 {
522 init_syscalls_info (gdbarch);
523
524 s->number = syscall_number;
525 s->name = xml_get_syscall_name (gdbarch, syscall_number);
526 }
527
528 void
529 get_syscall_by_name (struct gdbarch *gdbarch,
530 const char *syscall_name, struct syscall *s)
531 {
532 init_syscalls_info (gdbarch);
533
534 s->number = xml_get_syscall_number (gdbarch, syscall_name);
535 s->name = syscall_name;
536 }
537
538 const char **
539 get_syscall_names (struct gdbarch *gdbarch)
540 {
541 init_syscalls_info (gdbarch);
542
543 return xml_list_of_syscalls (gdbarch);
544 }
545
546 /* See comment in xml-syscall.h. */
547
548 struct syscall *
549 get_syscalls_by_group (struct gdbarch *gdbarch, const char *group)
550 {
551 init_syscalls_info (gdbarch);
552
553 return xml_list_syscalls_by_group (gdbarch, group);
554 }
555
556 /* See comment in xml-syscall.h. */
557
558 const char **
559 get_syscall_group_names (struct gdbarch *gdbarch)
560 {
561 init_syscalls_info (gdbarch);
562
563 return xml_list_of_groups (gdbarch);
564 }
565
566 #endif /* ! HAVE_LIBEXPAT */
gdbarch
Definition: gdbarch.c:127
string
const char * string
Definition: signals.c:50
syscall_attr
static const struct gdb_xml_attribute syscall_attr[]
Definition: xml-syscall.c:261
syscall_desc::syscall_desc
syscall_desc(int number_, std::string name_)
Definition: xml-syscall.c:99
syscall_desc::number
int number
Definition: xml-syscall.c:105
syscall
Definition: target.h:105
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void * value
Definition: xml-support.h:78
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Definition: xml-syscall.c:115
warning
void warning(const char *fmt,...)
Definition: errors.c:26
syscall_group_create_syscall_group_desc
static struct syscall_group_desc * syscall_group_create_syscall_group_desc(struct syscalls_info *syscalls_info, const char *group)
Definition: xml-syscall.c:165
gdb_xml_parser
Definition: xml-support.c:68
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static void syscall_group_add_syscall(struct syscalls_info *syscalls_info, struct syscall_desc *syscall, const char *group)
Definition: xml-syscall.c:178
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Definition: xml-support.h:75
internal_error
void internal_error(const char *file, int line, const char *fmt,...)
Definition: errors.c:50
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static struct syscalls_info * syscall_parse_xml(const char *document, xml_fetch_another fetcher, void *fetcher_baton)
Definition: xml-syscall.c:282
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static struct syscall * xml_list_syscalls_by_group(struct gdbarch *gdbarch, const char *group)
Definition: xml-syscall.c:454
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static struct syscall_group_desc * syscall_group_get_group_by_name(const struct syscalls_info *syscalls_info, const char *group)
Definition: xml-syscall.c:376
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gdb::unique_xmalloc_ptr< char >(* xml_fetch_another)(const char *href, void *baton)
Definition: xml-support.h:55
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struct syscalls_info * syscalls_info
Definition: xml-syscall.c:158
VEC
#define VEC(T)
Definition: vec.h:414
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void get_syscall_by_name(struct gdbarch *gdbarch, const char *syscall_name, struct syscall *s)
Definition: xml-syscall.c:529
_
#define _(String)
Definition: gdb_locale.h:35
defs.h
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void set_gdbarch_syscalls_info(struct gdbarch *gdbarch, struct syscalls_info *syscalls_info)
Definition: gdbarch.c:4315
GDB_XML_AF_NONE
Definition: xml-support.h:106
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void get_syscall_by_number(struct gdbarch *gdbarch, int syscall_number, struct syscall *s)
Definition: xml-syscall.c:519
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static void syscall_create_syscall_desc(struct syscalls_info *syscalls_info, const char *name, int number, char *groups)
Definition: xml-syscall.c:208
name
const char *const name
Definition: aarch64-tdep.c:76
syscall::number
int number
Definition: target.h:108
GDB_XML_AF_OPTIONAL
Definition: xml-support.h:107
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static struct syscalls_info * xml_init_syscalls_info(const char *filename)
Definition: xml-syscall.c:309
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std::string ldirname(const char *filename)
Definition: utils.c:3040
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Definition: xml-support.h:127
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std::unique_ptr< T, xfree_deleter< T > > unique_xmalloc_ptr
Definition: gdb_unique_ptr.h:48
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int gdb_xml_parse_quick(const char *name, const char *dtd_name, const struct gdb_xml_element *elements, const char *document, void *user_data)
Definition: xml-support.c:647
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std::string my_gdb_datadir
Definition: xml-syscall.c:148
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std::unique_ptr< syscall_group_desc > syscall_group_desc_up
Definition: xml-syscall.c:131
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std::unique_ptr< syscall_desc > syscall_desc_up
Definition: xml-syscall.c:112
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std::string name
Definition: xml-syscall.c:123
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#define VEC_length(T, V)
Definition: vec.h:140
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Definition: xml-syscall.c:154
xml_list_of_syscalls
static const char ** xml_list_of_syscalls(struct gdbarch *gdbarch)
Definition: xml-syscall.c:430
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Definition: main.c:62
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Definition: xml-syscall.c:109
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Definition: xml-syscall.c:134
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Definition: gdbarch.h:1558
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Definition: xml-support.h:129
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Definition: xml-syscall.c:138
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static const struct gdb_xml_element syselements[]
Definition: xml-syscall.c:275
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void set_xml_syscall_file_name(struct gdbarch *gdbarch, const char *name)
Definition: xml-syscall.c:513
xml-syscall.h
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std::vector< syscall_group_desc_up > groups
Definition: xml-syscall.c:142
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Definition: xml-support.h:165
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const char * gdbarch_xml_syscall_file(struct gdbarch *gdbarch)
Definition: gdbarch.c:4288
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#define gdb_assert(expr)
Definition: gdb_assert.h:32
value
Definition: value.c:169
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const char ** get_syscall_names(struct gdbarch *gdbarch)
Definition: xml-syscall.c:539
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#define XNEWVEC(T, N)
Definition: poison.h:145
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static const char * xml_get_syscall_name(struct gdbarch *gdbarch, int syscall_number)
Definition: xml-syscall.c:413
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std::unique_ptr< syscalls_info > syscalls_info_up
Definition: xml-syscall.c:151
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static int xml_get_syscall_number(struct gdbarch *gdbarch, const char *syscall_name)
Definition: xml-syscall.c:396
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Definition: xml-support.c:997
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#define VEC_address(T, V)
Definition: vec.h:385
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gdb_xml_attribute_handler gdb_xml_parse_attr_ulongest
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ULONGEST
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Definition: common-types.h:53
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Definition: xml-syscall.c:97
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const char ** get_syscall_group_names(struct gdbarch *gdbarch)
Definition: xml-syscall.c:559
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Definition: xml-support.h:114
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Definition: xml-support.h:128
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Definition: xml-syscall.c:549
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static const struct gdb_xml_element syscalls_info_children[]
Definition: xml-syscall.c:268
set_gdbarch_xml_syscall_file
void set_gdbarch_xml_syscall_file(struct gdbarch *gdbarch, const char *xml_syscall_file)
Definition: gdbarch.c:4298
init_syscalls_info
static void init_syscalls_info(struct gdbarch *gdbarch)
Definition: xml-syscall.c:324
syscall::name
const char * name
Definition: target.h:111
syscall_group_desc::syscalls
std::vector< syscall_desc * > syscalls
Definition: xml-syscall.c:128
syscall_group_desc::syscall_group_desc
syscall_group_desc(const std::string &name_)
Definition: xml-syscall.c:117
gdbarch_syscalls_info
struct syscalls_info * gdbarch_syscalls_info(struct gdbarch *gdbarch)
Definition: gdbarch.c:4305
xml_list_of_groups
static const char ** xml_list_of_groups(struct gdbarch *gdbarch)
Definition: xml-syscall.c:491
syscall_start_syscall
static void syscall_start_syscall(struct gdb_xml_parser *parser, const struct gdb_xml_element *element, void *user_data, VEC(gdb_xml_value_s) *attributes)
Definition: xml-syscall.c:228