xref: /openbmc/linux/tools/perf/builtin-trace.c (revision 32ced09d)
1 /*
2  * builtin-trace.c
3  *
4  * Builtin 'trace' command:
5  *
6  * Display a continuously updated trace of any workload, CPU, specific PID,
7  * system wide, etc.  Default format is loosely strace like, but any other
8  * event may be specified using --event.
9  *
10  * Copyright (C) 2012, 2013, 2014, 2015 Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
11  *
12  * Initially based on the 'trace' prototype by Thomas Gleixner:
13  *
14  * http://lwn.net/Articles/415728/ ("Announcing a new utility: 'trace'")
15  */
16 
17 #include "util/record.h"
18 #include <traceevent/event-parse.h>
19 #include <api/fs/tracing_path.h>
20 #include <bpf/bpf.h>
21 #include "util/bpf_map.h"
22 #include "util/rlimit.h"
23 #include "builtin.h"
24 #include "util/cgroup.h"
25 #include "util/color.h"
26 #include "util/config.h"
27 #include "util/debug.h"
28 #include "util/dso.h"
29 #include "util/env.h"
30 #include "util/event.h"
31 #include "util/evsel.h"
32 #include "util/evsel_fprintf.h"
33 #include "util/synthetic-events.h"
34 #include "util/evlist.h"
35 #include "util/evswitch.h"
36 #include "util/mmap.h"
37 #include <subcmd/pager.h>
38 #include <subcmd/exec-cmd.h>
39 #include "util/machine.h"
40 #include "util/map.h"
41 #include "util/symbol.h"
42 #include "util/path.h"
43 #include "util/session.h"
44 #include "util/thread.h"
45 #include <subcmd/parse-options.h>
46 #include "util/strlist.h"
47 #include "util/intlist.h"
48 #include "util/thread_map.h"
49 #include "util/stat.h"
50 #include "util/tool.h"
51 #include "util/util.h"
52 #include "trace/beauty/beauty.h"
53 #include "trace-event.h"
54 #include "util/parse-events.h"
55 #include "util/bpf-loader.h"
56 #include "callchain.h"
57 #include "print_binary.h"
58 #include "string2.h"
59 #include "syscalltbl.h"
60 #include "rb_resort.h"
61 #include "../perf.h"
62 
63 #include <errno.h>
64 #include <inttypes.h>
65 #include <poll.h>
66 #include <signal.h>
67 #include <stdlib.h>
68 #include <string.h>
69 #include <linux/err.h>
70 #include <linux/filter.h>
71 #include <linux/kernel.h>
72 #include <linux/random.h>
73 #include <linux/stringify.h>
74 #include <linux/time64.h>
75 #include <linux/zalloc.h>
76 #include <fcntl.h>
77 #include <sys/sysmacros.h>
78 
79 #include <linux/ctype.h>
80 #include <perf/mmap.h>
81 
82 #ifndef O_CLOEXEC
83 # define O_CLOEXEC		02000000
84 #endif
85 
86 #ifndef F_LINUX_SPECIFIC_BASE
87 # define F_LINUX_SPECIFIC_BASE	1024
88 #endif
89 
90 /*
91  * strtoul: Go from a string to a value, i.e. for msr: MSR_FS_BASE to 0xc0000100
92  */
93 struct syscall_arg_fmt {
94 	size_t	   (*scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
95 	bool	   (*strtoul)(char *bf, size_t size, struct syscall_arg *arg, u64 *val);
96 	unsigned long (*mask_val)(struct syscall_arg *arg, unsigned long val);
97 	void	   *parm;
98 	const char *name;
99 	u16	   nr_entries; // for arrays
100 	bool	   show_zero;
101 };
102 
103 struct syscall_fmt {
104 	const char *name;
105 	const char *alias;
106 	struct {
107 		const char *sys_enter,
108 			   *sys_exit;
109 	}	   bpf_prog_name;
110 	struct syscall_arg_fmt arg[6];
111 	u8	   nr_args;
112 	bool	   errpid;
113 	bool	   timeout;
114 	bool	   hexret;
115 };
116 
117 struct trace {
118 	struct perf_tool	tool;
119 	struct syscalltbl	*sctbl;
120 	struct {
121 		struct syscall  *table;
122 		struct bpf_map  *map;
123 		struct { // per syscall BPF_MAP_TYPE_PROG_ARRAY
124 			struct bpf_map  *sys_enter,
125 					*sys_exit;
126 		}		prog_array;
127 		struct {
128 			struct evsel *sys_enter,
129 					  *sys_exit,
130 					  *augmented;
131 		}		events;
132 		struct bpf_program *unaugmented_prog;
133 	} syscalls;
134 	struct {
135 		struct bpf_map *map;
136 	} dump;
137 	struct record_opts	opts;
138 	struct evlist	*evlist;
139 	struct machine		*host;
140 	struct thread		*current;
141 	struct bpf_object	*bpf_obj;
142 	struct cgroup		*cgroup;
143 	u64			base_time;
144 	FILE			*output;
145 	unsigned long		nr_events;
146 	unsigned long		nr_events_printed;
147 	unsigned long		max_events;
148 	struct evswitch		evswitch;
149 	struct strlist		*ev_qualifier;
150 	struct {
151 		size_t		nr;
152 		int		*entries;
153 	}			ev_qualifier_ids;
154 	struct {
155 		size_t		nr;
156 		pid_t		*entries;
157 		struct bpf_map  *map;
158 	}			filter_pids;
159 	double			duration_filter;
160 	double			runtime_ms;
161 	struct {
162 		u64		vfs_getname,
163 				proc_getname;
164 	} stats;
165 	unsigned int		max_stack;
166 	unsigned int		min_stack;
167 	int			raw_augmented_syscalls_args_size;
168 	bool			raw_augmented_syscalls;
169 	bool			fd_path_disabled;
170 	bool			sort_events;
171 	bool			not_ev_qualifier;
172 	bool			live;
173 	bool			full_time;
174 	bool			sched;
175 	bool			multiple_threads;
176 	bool			summary;
177 	bool			summary_only;
178 	bool			errno_summary;
179 	bool			failure_only;
180 	bool			show_comm;
181 	bool			print_sample;
182 	bool			show_tool_stats;
183 	bool			trace_syscalls;
184 	bool			libtraceevent_print;
185 	bool			kernel_syscallchains;
186 	s16			args_alignment;
187 	bool			show_tstamp;
188 	bool			show_duration;
189 	bool			show_zeros;
190 	bool			show_arg_names;
191 	bool			show_string_prefix;
192 	bool			force;
193 	bool			vfs_getname;
194 	int			trace_pgfaults;
195 	char			*perfconfig_events;
196 	struct {
197 		struct ordered_events	data;
198 		u64			last;
199 	} oe;
200 };
201 
202 struct tp_field {
203 	int offset;
204 	union {
205 		u64 (*integer)(struct tp_field *field, struct perf_sample *sample);
206 		void *(*pointer)(struct tp_field *field, struct perf_sample *sample);
207 	};
208 };
209 
210 #define TP_UINT_FIELD(bits) \
211 static u64 tp_field__u##bits(struct tp_field *field, struct perf_sample *sample) \
212 { \
213 	u##bits value; \
214 	memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
215 	return value;  \
216 }
217 
218 TP_UINT_FIELD(8);
219 TP_UINT_FIELD(16);
220 TP_UINT_FIELD(32);
221 TP_UINT_FIELD(64);
222 
223 #define TP_UINT_FIELD__SWAPPED(bits) \
224 static u64 tp_field__swapped_u##bits(struct tp_field *field, struct perf_sample *sample) \
225 { \
226 	u##bits value; \
227 	memcpy(&value, sample->raw_data + field->offset, sizeof(value)); \
228 	return bswap_##bits(value);\
229 }
230 
231 TP_UINT_FIELD__SWAPPED(16);
232 TP_UINT_FIELD__SWAPPED(32);
233 TP_UINT_FIELD__SWAPPED(64);
234 
235 static int __tp_field__init_uint(struct tp_field *field, int size, int offset, bool needs_swap)
236 {
237 	field->offset = offset;
238 
239 	switch (size) {
240 	case 1:
241 		field->integer = tp_field__u8;
242 		break;
243 	case 2:
244 		field->integer = needs_swap ? tp_field__swapped_u16 : tp_field__u16;
245 		break;
246 	case 4:
247 		field->integer = needs_swap ? tp_field__swapped_u32 : tp_field__u32;
248 		break;
249 	case 8:
250 		field->integer = needs_swap ? tp_field__swapped_u64 : tp_field__u64;
251 		break;
252 	default:
253 		return -1;
254 	}
255 
256 	return 0;
257 }
258 
259 static int tp_field__init_uint(struct tp_field *field, struct tep_format_field *format_field, bool needs_swap)
260 {
261 	return __tp_field__init_uint(field, format_field->size, format_field->offset, needs_swap);
262 }
263 
264 static void *tp_field__ptr(struct tp_field *field, struct perf_sample *sample)
265 {
266 	return sample->raw_data + field->offset;
267 }
268 
269 static int __tp_field__init_ptr(struct tp_field *field, int offset)
270 {
271 	field->offset = offset;
272 	field->pointer = tp_field__ptr;
273 	return 0;
274 }
275 
276 static int tp_field__init_ptr(struct tp_field *field, struct tep_format_field *format_field)
277 {
278 	return __tp_field__init_ptr(field, format_field->offset);
279 }
280 
281 struct syscall_tp {
282 	struct tp_field id;
283 	union {
284 		struct tp_field args, ret;
285 	};
286 };
287 
288 /*
289  * The evsel->priv as used by 'perf trace'
290  * sc:	for raw_syscalls:sys_{enter,exit} and syscalls:sys_{enter,exit}_SYSCALLNAME
291  * fmt: for all the other tracepoints
292  */
293 struct evsel_trace {
294 	struct syscall_tp	sc;
295 	struct syscall_arg_fmt  *fmt;
296 };
297 
298 static struct evsel_trace *evsel_trace__new(void)
299 {
300 	return zalloc(sizeof(struct evsel_trace));
301 }
302 
303 static void evsel_trace__delete(struct evsel_trace *et)
304 {
305 	if (et == NULL)
306 		return;
307 
308 	zfree(&et->fmt);
309 	free(et);
310 }
311 
312 /*
313  * Used with raw_syscalls:sys_{enter,exit} and with the
314  * syscalls:sys_{enter,exit}_SYSCALL tracepoints
315  */
316 static inline struct syscall_tp *__evsel__syscall_tp(struct evsel *evsel)
317 {
318 	struct evsel_trace *et = evsel->priv;
319 
320 	return &et->sc;
321 }
322 
323 static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel)
324 {
325 	if (evsel->priv == NULL) {
326 		evsel->priv = evsel_trace__new();
327 		if (evsel->priv == NULL)
328 			return NULL;
329 	}
330 
331 	return __evsel__syscall_tp(evsel);
332 }
333 
334 /*
335  * Used with all the other tracepoints.
336  */
337 static inline struct syscall_arg_fmt *__evsel__syscall_arg_fmt(struct evsel *evsel)
338 {
339 	struct evsel_trace *et = evsel->priv;
340 
341 	return et->fmt;
342 }
343 
344 static struct syscall_arg_fmt *evsel__syscall_arg_fmt(struct evsel *evsel)
345 {
346 	struct evsel_trace *et = evsel->priv;
347 
348 	if (evsel->priv == NULL) {
349 		et = evsel->priv = evsel_trace__new();
350 
351 		if (et == NULL)
352 			return NULL;
353 	}
354 
355 	if (et->fmt == NULL) {
356 		et->fmt = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt));
357 		if (et->fmt == NULL)
358 			goto out_delete;
359 	}
360 
361 	return __evsel__syscall_arg_fmt(evsel);
362 
363 out_delete:
364 	evsel_trace__delete(evsel->priv);
365 	evsel->priv = NULL;
366 	return NULL;
367 }
368 
369 static int perf_evsel__init_tp_uint_field(struct evsel *evsel,
370 					  struct tp_field *field,
371 					  const char *name)
372 {
373 	struct tep_format_field *format_field = perf_evsel__field(evsel, name);
374 
375 	if (format_field == NULL)
376 		return -1;
377 
378 	return tp_field__init_uint(field, format_field, evsel->needs_swap);
379 }
380 
381 #define perf_evsel__init_sc_tp_uint_field(evsel, name) \
382 	({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\
383 	   perf_evsel__init_tp_uint_field(evsel, &sc->name, #name); })
384 
385 static int perf_evsel__init_tp_ptr_field(struct evsel *evsel,
386 					 struct tp_field *field,
387 					 const char *name)
388 {
389 	struct tep_format_field *format_field = perf_evsel__field(evsel, name);
390 
391 	if (format_field == NULL)
392 		return -1;
393 
394 	return tp_field__init_ptr(field, format_field);
395 }
396 
397 #define perf_evsel__init_sc_tp_ptr_field(evsel, name) \
398 	({ struct syscall_tp *sc = __evsel__syscall_tp(evsel);\
399 	   perf_evsel__init_tp_ptr_field(evsel, &sc->name, #name); })
400 
401 static void evsel__delete_priv(struct evsel *evsel)
402 {
403 	zfree(&evsel->priv);
404 	evsel__delete(evsel);
405 }
406 
407 static int perf_evsel__init_syscall_tp(struct evsel *evsel)
408 {
409 	struct syscall_tp *sc = evsel__syscall_tp(evsel);
410 
411 	if (sc != NULL) {
412 		if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") &&
413 		    perf_evsel__init_tp_uint_field(evsel, &sc->id, "nr"))
414 			return -ENOENT;
415 		return 0;
416 	}
417 
418 	return -ENOMEM;
419 }
420 
421 static int perf_evsel__init_augmented_syscall_tp(struct evsel *evsel, struct evsel *tp)
422 {
423 	struct syscall_tp *sc = evsel__syscall_tp(evsel);
424 
425 	if (sc != NULL) {
426 		struct tep_format_field *syscall_id = perf_evsel__field(tp, "id");
427 		if (syscall_id == NULL)
428 			syscall_id = perf_evsel__field(tp, "__syscall_nr");
429 		if (syscall_id == NULL ||
430 		    __tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap))
431 			return -EINVAL;
432 
433 		return 0;
434 	}
435 
436 	return -ENOMEM;
437 }
438 
439 static int perf_evsel__init_augmented_syscall_tp_args(struct evsel *evsel)
440 {
441 	struct syscall_tp *sc = __evsel__syscall_tp(evsel);
442 
443 	return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));
444 }
445 
446 static int perf_evsel__init_augmented_syscall_tp_ret(struct evsel *evsel)
447 {
448 	struct syscall_tp *sc = __evsel__syscall_tp(evsel);
449 
450 	return __tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap);
451 }
452 
453 static int perf_evsel__init_raw_syscall_tp(struct evsel *evsel, void *handler)
454 {
455 	if (evsel__syscall_tp(evsel) != NULL) {
456 		if (perf_evsel__init_sc_tp_uint_field(evsel, id))
457 			return -ENOENT;
458 
459 		evsel->handler = handler;
460 		return 0;
461 	}
462 
463 	return -ENOMEM;
464 }
465 
466 static struct evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler)
467 {
468 	struct evsel *evsel = perf_evsel__newtp("raw_syscalls", direction);
469 
470 	/* older kernel (e.g., RHEL6) use syscalls:{enter,exit} */
471 	if (IS_ERR(evsel))
472 		evsel = perf_evsel__newtp("syscalls", direction);
473 
474 	if (IS_ERR(evsel))
475 		return NULL;
476 
477 	if (perf_evsel__init_raw_syscall_tp(evsel, handler))
478 		goto out_delete;
479 
480 	return evsel;
481 
482 out_delete:
483 	evsel__delete_priv(evsel);
484 	return NULL;
485 }
486 
487 #define perf_evsel__sc_tp_uint(evsel, name, sample) \
488 	({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \
489 	   fields->name.integer(&fields->name, sample); })
490 
491 #define perf_evsel__sc_tp_ptr(evsel, name, sample) \
492 	({ struct syscall_tp *fields = __evsel__syscall_tp(evsel); \
493 	   fields->name.pointer(&fields->name, sample); })
494 
495 size_t strarray__scnprintf_suffix(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_suffix, int val)
496 {
497 	int idx = val - sa->offset;
498 
499 	if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {
500 		size_t printed = scnprintf(bf, size, intfmt, val);
501 		if (show_suffix)
502 			printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);
503 		return printed;
504 	}
505 
506 	return scnprintf(bf, size, "%s%s", sa->entries[idx], show_suffix ? sa->prefix : "");
507 }
508 
509 size_t strarray__scnprintf(struct strarray *sa, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
510 {
511 	int idx = val - sa->offset;
512 
513 	if (idx < 0 || idx >= sa->nr_entries || sa->entries[idx] == NULL) {
514 		size_t printed = scnprintf(bf, size, intfmt, val);
515 		if (show_prefix)
516 			printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sa->prefix);
517 		return printed;
518 	}
519 
520 	return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
521 }
522 
523 static size_t __syscall_arg__scnprintf_strarray(char *bf, size_t size,
524 						const char *intfmt,
525 					        struct syscall_arg *arg)
526 {
527 	return strarray__scnprintf(arg->parm, bf, size, intfmt, arg->show_string_prefix, arg->val);
528 }
529 
530 static size_t syscall_arg__scnprintf_strarray(char *bf, size_t size,
531 					      struct syscall_arg *arg)
532 {
533 	return __syscall_arg__scnprintf_strarray(bf, size, "%d", arg);
534 }
535 
536 #define SCA_STRARRAY syscall_arg__scnprintf_strarray
537 
538 bool syscall_arg__strtoul_strarray(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
539 {
540 	return strarray__strtoul(arg->parm, bf, size, ret);
541 }
542 
543 bool syscall_arg__strtoul_strarray_flags(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
544 {
545 	return strarray__strtoul_flags(arg->parm, bf, size, ret);
546 }
547 
548 bool syscall_arg__strtoul_strarrays(char *bf, size_t size, struct syscall_arg *arg, u64 *ret)
549 {
550 	return strarrays__strtoul(arg->parm, bf, size, ret);
551 }
552 
553 size_t syscall_arg__scnprintf_strarray_flags(char *bf, size_t size, struct syscall_arg *arg)
554 {
555 	return strarray__scnprintf_flags(arg->parm, bf, size, arg->show_string_prefix, arg->val);
556 }
557 
558 size_t strarrays__scnprintf(struct strarrays *sas, char *bf, size_t size, const char *intfmt, bool show_prefix, int val)
559 {
560 	size_t printed;
561 	int i;
562 
563 	for (i = 0; i < sas->nr_entries; ++i) {
564 		struct strarray *sa = sas->entries[i];
565 		int idx = val - sa->offset;
566 
567 		if (idx >= 0 && idx < sa->nr_entries) {
568 			if (sa->entries[idx] == NULL)
569 				break;
570 			return scnprintf(bf, size, "%s%s", show_prefix ? sa->prefix : "", sa->entries[idx]);
571 		}
572 	}
573 
574 	printed = scnprintf(bf, size, intfmt, val);
575 	if (show_prefix)
576 		printed += scnprintf(bf + printed, size - printed, " /* %s??? */", sas->entries[0]->prefix);
577 	return printed;
578 }
579 
580 bool strarray__strtoul(struct strarray *sa, char *bf, size_t size, u64 *ret)
581 {
582 	int i;
583 
584 	for (i = 0; i < sa->nr_entries; ++i) {
585 		if (sa->entries[i] && strncmp(sa->entries[i], bf, size) == 0 && sa->entries[i][size] == '\0') {
586 			*ret = sa->offset + i;
587 			return true;
588 		}
589 	}
590 
591 	return false;
592 }
593 
594 bool strarray__strtoul_flags(struct strarray *sa, char *bf, size_t size, u64 *ret)
595 {
596 	u64 val = 0;
597 	char *tok = bf, *sep, *end;
598 
599 	*ret = 0;
600 
601 	while (size != 0) {
602 		int toklen = size;
603 
604 		sep = memchr(tok, '|', size);
605 		if (sep != NULL) {
606 			size -= sep - tok + 1;
607 
608 			end = sep - 1;
609 			while (end > tok && isspace(*end))
610 				--end;
611 
612 			toklen = end - tok + 1;
613 		}
614 
615 		while (isspace(*tok))
616 			++tok;
617 
618 		if (isalpha(*tok) || *tok == '_') {
619 			if (!strarray__strtoul(sa, tok, toklen, &val))
620 				return false;
621 		} else {
622 			bool is_hexa = tok[0] == 0 && (tok[1] = 'x' || tok[1] == 'X');
623 
624 			val = strtoul(tok, NULL, is_hexa ? 16 : 0);
625 		}
626 
627 		*ret |= (1 << (val - 1));
628 
629 		if (sep == NULL)
630 			break;
631 		tok = sep + 1;
632 	}
633 
634 	return true;
635 }
636 
637 bool strarrays__strtoul(struct strarrays *sas, char *bf, size_t size, u64 *ret)
638 {
639 	int i;
640 
641 	for (i = 0; i < sas->nr_entries; ++i) {
642 		struct strarray *sa = sas->entries[i];
643 
644 		if (strarray__strtoul(sa, bf, size, ret))
645 			return true;
646 	}
647 
648 	return false;
649 }
650 
651 size_t syscall_arg__scnprintf_strarrays(char *bf, size_t size,
652 					struct syscall_arg *arg)
653 {
654 	return strarrays__scnprintf(arg->parm, bf, size, "%d", arg->show_string_prefix, arg->val);
655 }
656 
657 #ifndef AT_FDCWD
658 #define AT_FDCWD	-100
659 #endif
660 
661 static size_t syscall_arg__scnprintf_fd_at(char *bf, size_t size,
662 					   struct syscall_arg *arg)
663 {
664 	int fd = arg->val;
665 	const char *prefix = "AT_FD";
666 
667 	if (fd == AT_FDCWD)
668 		return scnprintf(bf, size, "%s%s", arg->show_string_prefix ? prefix : "", "CWD");
669 
670 	return syscall_arg__scnprintf_fd(bf, size, arg);
671 }
672 
673 #define SCA_FDAT syscall_arg__scnprintf_fd_at
674 
675 static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
676 					      struct syscall_arg *arg);
677 
678 #define SCA_CLOSE_FD syscall_arg__scnprintf_close_fd
679 
680 size_t syscall_arg__scnprintf_hex(char *bf, size_t size, struct syscall_arg *arg)
681 {
682 	return scnprintf(bf, size, "%#lx", arg->val);
683 }
684 
685 size_t syscall_arg__scnprintf_ptr(char *bf, size_t size, struct syscall_arg *arg)
686 {
687 	if (arg->val == 0)
688 		return scnprintf(bf, size, "NULL");
689 	return syscall_arg__scnprintf_hex(bf, size, arg);
690 }
691 
692 size_t syscall_arg__scnprintf_int(char *bf, size_t size, struct syscall_arg *arg)
693 {
694 	return scnprintf(bf, size, "%d", arg->val);
695 }
696 
697 size_t syscall_arg__scnprintf_long(char *bf, size_t size, struct syscall_arg *arg)
698 {
699 	return scnprintf(bf, size, "%ld", arg->val);
700 }
701 
702 static size_t syscall_arg__scnprintf_char_array(char *bf, size_t size, struct syscall_arg *arg)
703 {
704 	// XXX Hey, maybe for sched:sched_switch prev/next comm fields we can
705 	//     fill missing comms using thread__set_comm()...
706 	//     here or in a special syscall_arg__scnprintf_pid_sched_tp...
707 	return scnprintf(bf, size, "\"%-.*s\"", arg->fmt->nr_entries ?: arg->len, arg->val);
708 }
709 
710 #define SCA_CHAR_ARRAY syscall_arg__scnprintf_char_array
711 
712 static const char *bpf_cmd[] = {
713 	"MAP_CREATE", "MAP_LOOKUP_ELEM", "MAP_UPDATE_ELEM", "MAP_DELETE_ELEM",
714 	"MAP_GET_NEXT_KEY", "PROG_LOAD",
715 };
716 static DEFINE_STRARRAY(bpf_cmd, "BPF_");
717 
718 static const char *fsmount_flags[] = {
719 	[1] = "CLOEXEC",
720 };
721 static DEFINE_STRARRAY(fsmount_flags, "FSMOUNT_");
722 
723 #include "trace/beauty/generated/fsconfig_arrays.c"
724 
725 static DEFINE_STRARRAY(fsconfig_cmds, "FSCONFIG_");
726 
727 static const char *epoll_ctl_ops[] = { "ADD", "DEL", "MOD", };
728 static DEFINE_STRARRAY_OFFSET(epoll_ctl_ops, "EPOLL_CTL_", 1);
729 
730 static const char *itimers[] = { "REAL", "VIRTUAL", "PROF", };
731 static DEFINE_STRARRAY(itimers, "ITIMER_");
732 
733 static const char *keyctl_options[] = {
734 	"GET_KEYRING_ID", "JOIN_SESSION_KEYRING", "UPDATE", "REVOKE", "CHOWN",
735 	"SETPERM", "DESCRIBE", "CLEAR", "LINK", "UNLINK", "SEARCH", "READ",
736 	"INSTANTIATE", "NEGATE", "SET_REQKEY_KEYRING", "SET_TIMEOUT",
737 	"ASSUME_AUTHORITY", "GET_SECURITY", "SESSION_TO_PARENT", "REJECT",
738 	"INSTANTIATE_IOV", "INVALIDATE", "GET_PERSISTENT",
739 };
740 static DEFINE_STRARRAY(keyctl_options, "KEYCTL_");
741 
742 static const char *whences[] = { "SET", "CUR", "END",
743 #ifdef SEEK_DATA
744 "DATA",
745 #endif
746 #ifdef SEEK_HOLE
747 "HOLE",
748 #endif
749 };
750 static DEFINE_STRARRAY(whences, "SEEK_");
751 
752 static const char *fcntl_cmds[] = {
753 	"DUPFD", "GETFD", "SETFD", "GETFL", "SETFL", "GETLK", "SETLK",
754 	"SETLKW", "SETOWN", "GETOWN", "SETSIG", "GETSIG", "GETLK64",
755 	"SETLK64", "SETLKW64", "SETOWN_EX", "GETOWN_EX",
756 	"GETOWNER_UIDS",
757 };
758 static DEFINE_STRARRAY(fcntl_cmds, "F_");
759 
760 static const char *fcntl_linux_specific_cmds[] = {
761 	"SETLEASE", "GETLEASE", "NOTIFY", [5] =	"CANCELLK", "DUPFD_CLOEXEC",
762 	"SETPIPE_SZ", "GETPIPE_SZ", "ADD_SEALS", "GET_SEALS",
763 	"GET_RW_HINT", "SET_RW_HINT", "GET_FILE_RW_HINT", "SET_FILE_RW_HINT",
764 };
765 
766 static DEFINE_STRARRAY_OFFSET(fcntl_linux_specific_cmds, "F_", F_LINUX_SPECIFIC_BASE);
767 
768 static struct strarray *fcntl_cmds_arrays[] = {
769 	&strarray__fcntl_cmds,
770 	&strarray__fcntl_linux_specific_cmds,
771 };
772 
773 static DEFINE_STRARRAYS(fcntl_cmds_arrays);
774 
775 static const char *rlimit_resources[] = {
776 	"CPU", "FSIZE", "DATA", "STACK", "CORE", "RSS", "NPROC", "NOFILE",
777 	"MEMLOCK", "AS", "LOCKS", "SIGPENDING", "MSGQUEUE", "NICE", "RTPRIO",
778 	"RTTIME",
779 };
780 static DEFINE_STRARRAY(rlimit_resources, "RLIMIT_");
781 
782 static const char *sighow[] = { "BLOCK", "UNBLOCK", "SETMASK", };
783 static DEFINE_STRARRAY(sighow, "SIG_");
784 
785 static const char *clockid[] = {
786 	"REALTIME", "MONOTONIC", "PROCESS_CPUTIME_ID", "THREAD_CPUTIME_ID",
787 	"MONOTONIC_RAW", "REALTIME_COARSE", "MONOTONIC_COARSE", "BOOTTIME",
788 	"REALTIME_ALARM", "BOOTTIME_ALARM", "SGI_CYCLE", "TAI"
789 };
790 static DEFINE_STRARRAY(clockid, "CLOCK_");
791 
792 static size_t syscall_arg__scnprintf_access_mode(char *bf, size_t size,
793 						 struct syscall_arg *arg)
794 {
795 	bool show_prefix = arg->show_string_prefix;
796 	const char *suffix = "_OK";
797 	size_t printed = 0;
798 	int mode = arg->val;
799 
800 	if (mode == F_OK) /* 0 */
801 		return scnprintf(bf, size, "F%s", show_prefix ? suffix : "");
802 #define	P_MODE(n) \
803 	if (mode & n##_OK) { \
804 		printed += scnprintf(bf + printed, size - printed, "%s%s", #n, show_prefix ? suffix : ""); \
805 		mode &= ~n##_OK; \
806 	}
807 
808 	P_MODE(R);
809 	P_MODE(W);
810 	P_MODE(X);
811 #undef P_MODE
812 
813 	if (mode)
814 		printed += scnprintf(bf + printed, size - printed, "|%#x", mode);
815 
816 	return printed;
817 }
818 
819 #define SCA_ACCMODE syscall_arg__scnprintf_access_mode
820 
821 static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
822 					      struct syscall_arg *arg);
823 
824 #define SCA_FILENAME syscall_arg__scnprintf_filename
825 
826 static size_t syscall_arg__scnprintf_pipe_flags(char *bf, size_t size,
827 						struct syscall_arg *arg)
828 {
829 	bool show_prefix = arg->show_string_prefix;
830 	const char *prefix = "O_";
831 	int printed = 0, flags = arg->val;
832 
833 #define	P_FLAG(n) \
834 	if (flags & O_##n) { \
835 		printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
836 		flags &= ~O_##n; \
837 	}
838 
839 	P_FLAG(CLOEXEC);
840 	P_FLAG(NONBLOCK);
841 #undef P_FLAG
842 
843 	if (flags)
844 		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
845 
846 	return printed;
847 }
848 
849 #define SCA_PIPE_FLAGS syscall_arg__scnprintf_pipe_flags
850 
851 #ifndef GRND_NONBLOCK
852 #define GRND_NONBLOCK	0x0001
853 #endif
854 #ifndef GRND_RANDOM
855 #define GRND_RANDOM	0x0002
856 #endif
857 
858 static size_t syscall_arg__scnprintf_getrandom_flags(char *bf, size_t size,
859 						   struct syscall_arg *arg)
860 {
861 	bool show_prefix = arg->show_string_prefix;
862 	const char *prefix = "GRND_";
863 	int printed = 0, flags = arg->val;
864 
865 #define	P_FLAG(n) \
866 	if (flags & GRND_##n) { \
867 		printed += scnprintf(bf + printed, size - printed, "%s%s%s", printed ? "|" : "", show_prefix ? prefix : "", #n); \
868 		flags &= ~GRND_##n; \
869 	}
870 
871 	P_FLAG(RANDOM);
872 	P_FLAG(NONBLOCK);
873 #undef P_FLAG
874 
875 	if (flags)
876 		printed += scnprintf(bf + printed, size - printed, "%s%#x", printed ? "|" : "", flags);
877 
878 	return printed;
879 }
880 
881 #define SCA_GETRANDOM_FLAGS syscall_arg__scnprintf_getrandom_flags
882 
883 #define STRARRAY(name, array) \
884 	  { .scnprintf	= SCA_STRARRAY, \
885 	    .strtoul	= STUL_STRARRAY, \
886 	    .parm	= &strarray__##array, }
887 
888 #define STRARRAY_FLAGS(name, array) \
889 	  { .scnprintf	= SCA_STRARRAY_FLAGS, \
890 	    .strtoul	= STUL_STRARRAY_FLAGS, \
891 	    .parm	= &strarray__##array, }
892 
893 #include "trace/beauty/arch_errno_names.c"
894 #include "trace/beauty/eventfd.c"
895 #include "trace/beauty/futex_op.c"
896 #include "trace/beauty/futex_val3.c"
897 #include "trace/beauty/mmap.c"
898 #include "trace/beauty/mode_t.c"
899 #include "trace/beauty/msg_flags.c"
900 #include "trace/beauty/open_flags.c"
901 #include "trace/beauty/perf_event_open.c"
902 #include "trace/beauty/pid.c"
903 #include "trace/beauty/sched_policy.c"
904 #include "trace/beauty/seccomp.c"
905 #include "trace/beauty/signum.c"
906 #include "trace/beauty/socket_type.c"
907 #include "trace/beauty/waitid_options.c"
908 
909 static struct syscall_fmt syscall_fmts[] = {
910 	{ .name	    = "access",
911 	  .arg = { [1] = { .scnprintf = SCA_ACCMODE,  /* mode */ }, }, },
912 	{ .name	    = "arch_prctl",
913 	  .arg = { [0] = { .scnprintf = SCA_X86_ARCH_PRCTL_CODE, /* code */ },
914 		   [1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },
915 	{ .name	    = "bind",
916 	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
917 		   [1] = { .scnprintf = SCA_SOCKADDR, /* umyaddr */ },
918 		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
919 	{ .name	    = "bpf",
920 	  .arg = { [0] = STRARRAY(cmd, bpf_cmd), }, },
921 	{ .name	    = "brk",	    .hexret = true,
922 	  .arg = { [0] = { .scnprintf = SCA_PTR, /* brk */ }, }, },
923 	{ .name     = "clock_gettime",
924 	  .arg = { [0] = STRARRAY(clk_id, clockid), }, },
925 	{ .name	    = "clone",	    .errpid = true, .nr_args = 5,
926 	  .arg = { [0] = { .name = "flags",	    .scnprintf = SCA_CLONE_FLAGS, },
927 		   [1] = { .name = "child_stack",   .scnprintf = SCA_HEX, },
928 		   [2] = { .name = "parent_tidptr", .scnprintf = SCA_HEX, },
929 		   [3] = { .name = "child_tidptr",  .scnprintf = SCA_HEX, },
930 		   [4] = { .name = "tls",	    .scnprintf = SCA_HEX, }, }, },
931 	{ .name	    = "close",
932 	  .arg = { [0] = { .scnprintf = SCA_CLOSE_FD, /* fd */ }, }, },
933 	{ .name	    = "connect",
934 	  .arg = { [0] = { .scnprintf = SCA_INT, /* fd */ },
935 		   [1] = { .scnprintf = SCA_SOCKADDR, /* servaddr */ },
936 		   [2] = { .scnprintf = SCA_INT, /* addrlen */ }, }, },
937 	{ .name	    = "epoll_ctl",
938 	  .arg = { [1] = STRARRAY(op, epoll_ctl_ops), }, },
939 	{ .name	    = "eventfd2",
940 	  .arg = { [1] = { .scnprintf = SCA_EFD_FLAGS, /* flags */ }, }, },
941 	{ .name	    = "fchmodat",
942 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
943 	{ .name	    = "fchownat",
944 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
945 	{ .name	    = "fcntl",
946 	  .arg = { [1] = { .scnprintf = SCA_FCNTL_CMD,  /* cmd */
947 			   .strtoul   = STUL_STRARRAYS,
948 			   .parm      = &strarrays__fcntl_cmds_arrays,
949 			   .show_zero = true, },
950 		   [2] = { .scnprintf =  SCA_FCNTL_ARG, /* arg */ }, }, },
951 	{ .name	    = "flock",
952 	  .arg = { [1] = { .scnprintf = SCA_FLOCK, /* cmd */ }, }, },
953 	{ .name     = "fsconfig",
954 	  .arg = { [1] = STRARRAY(cmd, fsconfig_cmds), }, },
955 	{ .name     = "fsmount",
956 	  .arg = { [1] = STRARRAY_FLAGS(flags, fsmount_flags),
957 		   [2] = { .scnprintf = SCA_FSMOUNT_ATTR_FLAGS, /* attr_flags */ }, }, },
958 	{ .name     = "fspick",
959 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	  /* dfd */ },
960 		   [1] = { .scnprintf = SCA_FILENAME,	  /* path */ },
961 		   [2] = { .scnprintf = SCA_FSPICK_FLAGS, /* flags */ }, }, },
962 	{ .name	    = "fstat", .alias = "newfstat", },
963 	{ .name	    = "fstatat", .alias = "newfstatat", },
964 	{ .name	    = "futex",
965 	  .arg = { [1] = { .scnprintf = SCA_FUTEX_OP, /* op */ },
966 		   [5] = { .scnprintf = SCA_FUTEX_VAL3, /* val3 */ }, }, },
967 	{ .name	    = "futimesat",
968 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
969 	{ .name	    = "getitimer",
970 	  .arg = { [0] = STRARRAY(which, itimers), }, },
971 	{ .name	    = "getpid",	    .errpid = true, },
972 	{ .name	    = "getpgid",    .errpid = true, },
973 	{ .name	    = "getppid",    .errpid = true, },
974 	{ .name	    = "getrandom",
975 	  .arg = { [2] = { .scnprintf = SCA_GETRANDOM_FLAGS, /* flags */ }, }, },
976 	{ .name	    = "getrlimit",
977 	  .arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
978 	{ .name	    = "gettid",	    .errpid = true, },
979 	{ .name	    = "ioctl",
980 	  .arg = {
981 #if defined(__i386__) || defined(__x86_64__)
982 /*
983  * FIXME: Make this available to all arches.
984  */
985 		   [1] = { .scnprintf = SCA_IOCTL_CMD, /* cmd */ },
986 		   [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
987 #else
988 		   [2] = { .scnprintf = SCA_HEX, /* arg */ }, }, },
989 #endif
990 	{ .name	    = "kcmp",	    .nr_args = 5,
991 	  .arg = { [0] = { .name = "pid1",	.scnprintf = SCA_PID, },
992 		   [1] = { .name = "pid2",	.scnprintf = SCA_PID, },
993 		   [2] = { .name = "type",	.scnprintf = SCA_KCMP_TYPE, },
994 		   [3] = { .name = "idx1",	.scnprintf = SCA_KCMP_IDX, },
995 		   [4] = { .name = "idx2",	.scnprintf = SCA_KCMP_IDX, }, }, },
996 	{ .name	    = "keyctl",
997 	  .arg = { [0] = STRARRAY(option, keyctl_options), }, },
998 	{ .name	    = "kill",
999 	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1000 	{ .name	    = "linkat",
1001 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
1002 	{ .name	    = "lseek",
1003 	  .arg = { [2] = STRARRAY(whence, whences), }, },
1004 	{ .name	    = "lstat", .alias = "newlstat", },
1005 	{ .name     = "madvise",
1006 	  .arg = { [0] = { .scnprintf = SCA_HEX,      /* start */ },
1007 		   [2] = { .scnprintf = SCA_MADV_BHV, /* behavior */ }, }, },
1008 	{ .name	    = "mkdirat",
1009 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
1010 	{ .name	    = "mknodat",
1011 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* fd */ }, }, },
1012 	{ .name	    = "mmap",	    .hexret = true,
1013 /* The standard mmap maps to old_mmap on s390x */
1014 #if defined(__s390x__)
1015 	.alias = "old_mmap",
1016 #endif
1017 	  .arg = { [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ },
1018 		   [3] = { .scnprintf = SCA_MMAP_FLAGS,	/* flags */
1019 			   .strtoul   = STUL_STRARRAY_FLAGS,
1020 			   .parm      = &strarray__mmap_flags, },
1021 		   [5] = { .scnprintf = SCA_HEX,	/* offset */ }, }, },
1022 	{ .name	    = "mount",
1023 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* dev_name */ },
1024 		   [3] = { .scnprintf = SCA_MOUNT_FLAGS, /* flags */
1025 			   .mask_val  = SCAMV_MOUNT_FLAGS, /* flags */ }, }, },
1026 	{ .name	    = "move_mount",
1027 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* from_dfd */ },
1028 		   [1] = { .scnprintf = SCA_FILENAME, /* from_pathname */ },
1029 		   [2] = { .scnprintf = SCA_FDAT,	/* to_dfd */ },
1030 		   [3] = { .scnprintf = SCA_FILENAME, /* to_pathname */ },
1031 		   [4] = { .scnprintf = SCA_MOVE_MOUNT_FLAGS, /* flags */ }, }, },
1032 	{ .name	    = "mprotect",
1033 	  .arg = { [0] = { .scnprintf = SCA_HEX,	/* start */ },
1034 		   [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ }, }, },
1035 	{ .name	    = "mq_unlink",
1036 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* u_name */ }, }, },
1037 	{ .name	    = "mremap",	    .hexret = true,
1038 	  .arg = { [3] = { .scnprintf = SCA_MREMAP_FLAGS, /* flags */ }, }, },
1039 	{ .name	    = "name_to_handle_at",
1040 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
1041 	{ .name	    = "newfstatat",
1042 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
1043 	{ .name	    = "open",
1044 	  .arg = { [1] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
1045 	{ .name	    = "open_by_handle_at",
1046 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* dfd */ },
1047 		   [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
1048 	{ .name	    = "openat",
1049 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	/* dfd */ },
1050 		   [2] = { .scnprintf = SCA_OPEN_FLAGS, /* flags */ }, }, },
1051 	{ .name	    = "perf_event_open",
1052 	  .arg = { [2] = { .scnprintf = SCA_INT,	/* cpu */ },
1053 		   [3] = { .scnprintf = SCA_FD,		/* group_fd */ },
1054 		   [4] = { .scnprintf = SCA_PERF_FLAGS, /* flags */ }, }, },
1055 	{ .name	    = "pipe2",
1056 	  .arg = { [1] = { .scnprintf = SCA_PIPE_FLAGS, /* flags */ }, }, },
1057 	{ .name	    = "pkey_alloc",
1058 	  .arg = { [1] = { .scnprintf = SCA_PKEY_ALLOC_ACCESS_RIGHTS,	/* access_rights */ }, }, },
1059 	{ .name	    = "pkey_free",
1060 	  .arg = { [0] = { .scnprintf = SCA_INT,	/* key */ }, }, },
1061 	{ .name	    = "pkey_mprotect",
1062 	  .arg = { [0] = { .scnprintf = SCA_HEX,	/* start */ },
1063 		   [2] = { .scnprintf = SCA_MMAP_PROT,	/* prot */ },
1064 		   [3] = { .scnprintf = SCA_INT,	/* pkey */ }, }, },
1065 	{ .name	    = "poll", .timeout = true, },
1066 	{ .name	    = "ppoll", .timeout = true, },
1067 	{ .name	    = "prctl",
1068 	  .arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */ },
1069 		   [1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },
1070 		   [2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },
1071 	{ .name	    = "pread", .alias = "pread64", },
1072 	{ .name	    = "preadv", .alias = "pread", },
1073 	{ .name	    = "prlimit64",
1074 	  .arg = { [1] = STRARRAY(resource, rlimit_resources), }, },
1075 	{ .name	    = "pwrite", .alias = "pwrite64", },
1076 	{ .name	    = "readlinkat",
1077 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
1078 	{ .name	    = "recvfrom",
1079 	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
1080 	{ .name	    = "recvmmsg",
1081 	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
1082 	{ .name	    = "recvmsg",
1083 	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
1084 	{ .name	    = "renameat",
1085 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
1086 		   [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ }, }, },
1087 	{ .name	    = "renameat2",
1088 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* olddirfd */ },
1089 		   [2] = { .scnprintf = SCA_FDAT, /* newdirfd */ },
1090 		   [4] = { .scnprintf = SCA_RENAMEAT2_FLAGS, /* flags */ }, }, },
1091 	{ .name	    = "rt_sigaction",
1092 	  .arg = { [0] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1093 	{ .name	    = "rt_sigprocmask",
1094 	  .arg = { [0] = STRARRAY(how, sighow), }, },
1095 	{ .name	    = "rt_sigqueueinfo",
1096 	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1097 	{ .name	    = "rt_tgsigqueueinfo",
1098 	  .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1099 	{ .name	    = "sched_setscheduler",
1100 	  .arg = { [1] = { .scnprintf = SCA_SCHED_POLICY, /* policy */ }, }, },
1101 	{ .name	    = "seccomp",
1102 	  .arg = { [0] = { .scnprintf = SCA_SECCOMP_OP,	   /* op */ },
1103 		   [1] = { .scnprintf = SCA_SECCOMP_FLAGS, /* flags */ }, }, },
1104 	{ .name	    = "select", .timeout = true, },
1105 	{ .name	    = "sendfile", .alias = "sendfile64", },
1106 	{ .name	    = "sendmmsg",
1107 	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
1108 	{ .name	    = "sendmsg",
1109 	  .arg = { [2] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ }, }, },
1110 	{ .name	    = "sendto",
1111 	  .arg = { [3] = { .scnprintf = SCA_MSG_FLAGS, /* flags */ },
1112 		   [4] = { .scnprintf = SCA_SOCKADDR, /* addr */ }, }, },
1113 	{ .name	    = "set_tid_address", .errpid = true, },
1114 	{ .name	    = "setitimer",
1115 	  .arg = { [0] = STRARRAY(which, itimers), }, },
1116 	{ .name	    = "setrlimit",
1117 	  .arg = { [0] = STRARRAY(resource, rlimit_resources), }, },
1118 	{ .name	    = "socket",
1119 	  .arg = { [0] = STRARRAY(family, socket_families),
1120 		   [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
1121 		   [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
1122 	{ .name	    = "socketpair",
1123 	  .arg = { [0] = STRARRAY(family, socket_families),
1124 		   [1] = { .scnprintf = SCA_SK_TYPE, /* type */ },
1125 		   [2] = { .scnprintf = SCA_SK_PROTO, /* protocol */ }, }, },
1126 	{ .name	    = "stat", .alias = "newstat", },
1127 	{ .name	    = "statx",
1128 	  .arg = { [0] = { .scnprintf = SCA_FDAT,	 /* fdat */ },
1129 		   [2] = { .scnprintf = SCA_STATX_FLAGS, /* flags */ } ,
1130 		   [3] = { .scnprintf = SCA_STATX_MASK,	 /* mask */ }, }, },
1131 	{ .name	    = "swapoff",
1132 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
1133 	{ .name	    = "swapon",
1134 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* specialfile */ }, }, },
1135 	{ .name	    = "symlinkat",
1136 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
1137 	{ .name	    = "sync_file_range",
1138 	  .arg = { [3] = { .scnprintf = SCA_SYNC_FILE_RANGE_FLAGS, /* flags */ }, }, },
1139 	{ .name	    = "tgkill",
1140 	  .arg = { [2] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1141 	{ .name	    = "tkill",
1142 	  .arg = { [1] = { .scnprintf = SCA_SIGNUM, /* sig */ }, }, },
1143 	{ .name     = "umount2", .alias = "umount",
1144 	  .arg = { [0] = { .scnprintf = SCA_FILENAME, /* name */ }, }, },
1145 	{ .name	    = "uname", .alias = "newuname", },
1146 	{ .name	    = "unlinkat",
1147 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dfd */ }, }, },
1148 	{ .name	    = "utimensat",
1149 	  .arg = { [0] = { .scnprintf = SCA_FDAT, /* dirfd */ }, }, },
1150 	{ .name	    = "wait4",	    .errpid = true,
1151 	  .arg = { [2] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
1152 	{ .name	    = "waitid",	    .errpid = true,
1153 	  .arg = { [3] = { .scnprintf = SCA_WAITID_OPTIONS, /* options */ }, }, },
1154 };
1155 
1156 static int syscall_fmt__cmp(const void *name, const void *fmtp)
1157 {
1158 	const struct syscall_fmt *fmt = fmtp;
1159 	return strcmp(name, fmt->name);
1160 }
1161 
1162 static struct syscall_fmt *__syscall_fmt__find(struct syscall_fmt *fmts, const int nmemb, const char *name)
1163 {
1164 	return bsearch(name, fmts, nmemb, sizeof(struct syscall_fmt), syscall_fmt__cmp);
1165 }
1166 
1167 static struct syscall_fmt *syscall_fmt__find(const char *name)
1168 {
1169 	const int nmemb = ARRAY_SIZE(syscall_fmts);
1170 	return __syscall_fmt__find(syscall_fmts, nmemb, name);
1171 }
1172 
1173 static struct syscall_fmt *__syscall_fmt__find_by_alias(struct syscall_fmt *fmts, const int nmemb, const char *alias)
1174 {
1175 	int i;
1176 
1177 	for (i = 0; i < nmemb; ++i) {
1178 		if (fmts[i].alias && strcmp(fmts[i].alias, alias) == 0)
1179 			return &fmts[i];
1180 	}
1181 
1182 	return NULL;
1183 }
1184 
1185 static struct syscall_fmt *syscall_fmt__find_by_alias(const char *alias)
1186 {
1187 	const int nmemb = ARRAY_SIZE(syscall_fmts);
1188 	return __syscall_fmt__find_by_alias(syscall_fmts, nmemb, alias);
1189 }
1190 
1191 /*
1192  * is_exit: is this "exit" or "exit_group"?
1193  * is_open: is this "open" or "openat"? To associate the fd returned in sys_exit with the pathname in sys_enter.
1194  * args_size: sum of the sizes of the syscall arguments, anything after that is augmented stuff: pathname for openat, etc.
1195  * nonexistent: Just a hole in the syscall table, syscall id not allocated
1196  */
1197 struct syscall {
1198 	struct tep_event    *tp_format;
1199 	int		    nr_args;
1200 	int		    args_size;
1201 	struct {
1202 		struct bpf_program *sys_enter,
1203 				   *sys_exit;
1204 	}		    bpf_prog;
1205 	bool		    is_exit;
1206 	bool		    is_open;
1207 	bool		    nonexistent;
1208 	struct tep_format_field *args;
1209 	const char	    *name;
1210 	struct syscall_fmt  *fmt;
1211 	struct syscall_arg_fmt *arg_fmt;
1212 };
1213 
1214 /*
1215  * Must match what is in the BPF program:
1216  *
1217  * tools/perf/examples/bpf/augmented_raw_syscalls.c
1218  */
1219 struct bpf_map_syscall_entry {
1220 	bool	enabled;
1221 	u16	string_args_len[6];
1222 };
1223 
1224 /*
1225  * We need to have this 'calculated' boolean because in some cases we really
1226  * don't know what is the duration of a syscall, for instance, when we start
1227  * a session and some threads are waiting for a syscall to finish, say 'poll',
1228  * in which case all we can do is to print "( ? ) for duration and for the
1229  * start timestamp.
1230  */
1231 static size_t fprintf_duration(unsigned long t, bool calculated, FILE *fp)
1232 {
1233 	double duration = (double)t / NSEC_PER_MSEC;
1234 	size_t printed = fprintf(fp, "(");
1235 
1236 	if (!calculated)
1237 		printed += fprintf(fp, "         ");
1238 	else if (duration >= 1.0)
1239 		printed += color_fprintf(fp, PERF_COLOR_RED, "%6.3f ms", duration);
1240 	else if (duration >= 0.01)
1241 		printed += color_fprintf(fp, PERF_COLOR_YELLOW, "%6.3f ms", duration);
1242 	else
1243 		printed += color_fprintf(fp, PERF_COLOR_NORMAL, "%6.3f ms", duration);
1244 	return printed + fprintf(fp, "): ");
1245 }
1246 
1247 /**
1248  * filename.ptr: The filename char pointer that will be vfs_getname'd
1249  * filename.entry_str_pos: Where to insert the string translated from
1250  *                         filename.ptr by the vfs_getname tracepoint/kprobe.
1251  * ret_scnprintf: syscall args may set this to a different syscall return
1252  *                formatter, for instance, fcntl may return fds, file flags, etc.
1253  */
1254 struct thread_trace {
1255 	u64		  entry_time;
1256 	bool		  entry_pending;
1257 	unsigned long	  nr_events;
1258 	unsigned long	  pfmaj, pfmin;
1259 	char		  *entry_str;
1260 	double		  runtime_ms;
1261 	size_t		  (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg);
1262         struct {
1263 		unsigned long ptr;
1264 		short int     entry_str_pos;
1265 		bool	      pending_open;
1266 		unsigned int  namelen;
1267 		char	      *name;
1268 	} filename;
1269 	struct {
1270 		int	      max;
1271 		struct file   *table;
1272 	} files;
1273 
1274 	struct intlist *syscall_stats;
1275 };
1276 
1277 static struct thread_trace *thread_trace__new(void)
1278 {
1279 	struct thread_trace *ttrace =  zalloc(sizeof(struct thread_trace));
1280 
1281 	if (ttrace) {
1282 		ttrace->files.max = -1;
1283 		ttrace->syscall_stats = intlist__new(NULL);
1284 	}
1285 
1286 	return ttrace;
1287 }
1288 
1289 static struct thread_trace *thread__trace(struct thread *thread, FILE *fp)
1290 {
1291 	struct thread_trace *ttrace;
1292 
1293 	if (thread == NULL)
1294 		goto fail;
1295 
1296 	if (thread__priv(thread) == NULL)
1297 		thread__set_priv(thread, thread_trace__new());
1298 
1299 	if (thread__priv(thread) == NULL)
1300 		goto fail;
1301 
1302 	ttrace = thread__priv(thread);
1303 	++ttrace->nr_events;
1304 
1305 	return ttrace;
1306 fail:
1307 	color_fprintf(fp, PERF_COLOR_RED,
1308 		      "WARNING: not enough memory, dropping samples!\n");
1309 	return NULL;
1310 }
1311 
1312 
1313 void syscall_arg__set_ret_scnprintf(struct syscall_arg *arg,
1314 				    size_t (*ret_scnprintf)(char *bf, size_t size, struct syscall_arg *arg))
1315 {
1316 	struct thread_trace *ttrace = thread__priv(arg->thread);
1317 
1318 	ttrace->ret_scnprintf = ret_scnprintf;
1319 }
1320 
1321 #define TRACE_PFMAJ		(1 << 0)
1322 #define TRACE_PFMIN		(1 << 1)
1323 
1324 static const size_t trace__entry_str_size = 2048;
1325 
1326 static struct file *thread_trace__files_entry(struct thread_trace *ttrace, int fd)
1327 {
1328 	if (fd < 0)
1329 		return NULL;
1330 
1331 	if (fd > ttrace->files.max) {
1332 		struct file *nfiles = realloc(ttrace->files.table, (fd + 1) * sizeof(struct file));
1333 
1334 		if (nfiles == NULL)
1335 			return NULL;
1336 
1337 		if (ttrace->files.max != -1) {
1338 			memset(nfiles + ttrace->files.max + 1, 0,
1339 			       (fd - ttrace->files.max) * sizeof(struct file));
1340 		} else {
1341 			memset(nfiles, 0, (fd + 1) * sizeof(struct file));
1342 		}
1343 
1344 		ttrace->files.table = nfiles;
1345 		ttrace->files.max   = fd;
1346 	}
1347 
1348 	return ttrace->files.table + fd;
1349 }
1350 
1351 struct file *thread__files_entry(struct thread *thread, int fd)
1352 {
1353 	return thread_trace__files_entry(thread__priv(thread), fd);
1354 }
1355 
1356 static int trace__set_fd_pathname(struct thread *thread, int fd, const char *pathname)
1357 {
1358 	struct thread_trace *ttrace = thread__priv(thread);
1359 	struct file *file = thread_trace__files_entry(ttrace, fd);
1360 
1361 	if (file != NULL) {
1362 		struct stat st;
1363 		if (stat(pathname, &st) == 0)
1364 			file->dev_maj = major(st.st_rdev);
1365 		file->pathname = strdup(pathname);
1366 		if (file->pathname)
1367 			return 0;
1368 	}
1369 
1370 	return -1;
1371 }
1372 
1373 static int thread__read_fd_path(struct thread *thread, int fd)
1374 {
1375 	char linkname[PATH_MAX], pathname[PATH_MAX];
1376 	struct stat st;
1377 	int ret;
1378 
1379 	if (thread->pid_ == thread->tid) {
1380 		scnprintf(linkname, sizeof(linkname),
1381 			  "/proc/%d/fd/%d", thread->pid_, fd);
1382 	} else {
1383 		scnprintf(linkname, sizeof(linkname),
1384 			  "/proc/%d/task/%d/fd/%d", thread->pid_, thread->tid, fd);
1385 	}
1386 
1387 	if (lstat(linkname, &st) < 0 || st.st_size + 1 > (off_t)sizeof(pathname))
1388 		return -1;
1389 
1390 	ret = readlink(linkname, pathname, sizeof(pathname));
1391 
1392 	if (ret < 0 || ret > st.st_size)
1393 		return -1;
1394 
1395 	pathname[ret] = '\0';
1396 	return trace__set_fd_pathname(thread, fd, pathname);
1397 }
1398 
1399 static const char *thread__fd_path(struct thread *thread, int fd,
1400 				   struct trace *trace)
1401 {
1402 	struct thread_trace *ttrace = thread__priv(thread);
1403 
1404 	if (ttrace == NULL || trace->fd_path_disabled)
1405 		return NULL;
1406 
1407 	if (fd < 0)
1408 		return NULL;
1409 
1410 	if ((fd > ttrace->files.max || ttrace->files.table[fd].pathname == NULL)) {
1411 		if (!trace->live)
1412 			return NULL;
1413 		++trace->stats.proc_getname;
1414 		if (thread__read_fd_path(thread, fd))
1415 			return NULL;
1416 	}
1417 
1418 	return ttrace->files.table[fd].pathname;
1419 }
1420 
1421 size_t syscall_arg__scnprintf_fd(char *bf, size_t size, struct syscall_arg *arg)
1422 {
1423 	int fd = arg->val;
1424 	size_t printed = scnprintf(bf, size, "%d", fd);
1425 	const char *path = thread__fd_path(arg->thread, fd, arg->trace);
1426 
1427 	if (path)
1428 		printed += scnprintf(bf + printed, size - printed, "<%s>", path);
1429 
1430 	return printed;
1431 }
1432 
1433 size_t pid__scnprintf_fd(struct trace *trace, pid_t pid, int fd, char *bf, size_t size)
1434 {
1435         size_t printed = scnprintf(bf, size, "%d", fd);
1436 	struct thread *thread = machine__find_thread(trace->host, pid, pid);
1437 
1438 	if (thread) {
1439 		const char *path = thread__fd_path(thread, fd, trace);
1440 
1441 		if (path)
1442 			printed += scnprintf(bf + printed, size - printed, "<%s>", path);
1443 
1444 		thread__put(thread);
1445 	}
1446 
1447         return printed;
1448 }
1449 
1450 static size_t syscall_arg__scnprintf_close_fd(char *bf, size_t size,
1451 					      struct syscall_arg *arg)
1452 {
1453 	int fd = arg->val;
1454 	size_t printed = syscall_arg__scnprintf_fd(bf, size, arg);
1455 	struct thread_trace *ttrace = thread__priv(arg->thread);
1456 
1457 	if (ttrace && fd >= 0 && fd <= ttrace->files.max)
1458 		zfree(&ttrace->files.table[fd].pathname);
1459 
1460 	return printed;
1461 }
1462 
1463 static void thread__set_filename_pos(struct thread *thread, const char *bf,
1464 				     unsigned long ptr)
1465 {
1466 	struct thread_trace *ttrace = thread__priv(thread);
1467 
1468 	ttrace->filename.ptr = ptr;
1469 	ttrace->filename.entry_str_pos = bf - ttrace->entry_str;
1470 }
1471 
1472 static size_t syscall_arg__scnprintf_augmented_string(struct syscall_arg *arg, char *bf, size_t size)
1473 {
1474 	struct augmented_arg *augmented_arg = arg->augmented.args;
1475 	size_t printed = scnprintf(bf, size, "\"%.*s\"", augmented_arg->size, augmented_arg->value);
1476 	/*
1477 	 * So that the next arg with a payload can consume its augmented arg, i.e. for rename* syscalls
1478 	 * we would have two strings, each prefixed by its size.
1479 	 */
1480 	int consumed = sizeof(*augmented_arg) + augmented_arg->size;
1481 
1482 	arg->augmented.args = ((void *)arg->augmented.args) + consumed;
1483 	arg->augmented.size -= consumed;
1484 
1485 	return printed;
1486 }
1487 
1488 static size_t syscall_arg__scnprintf_filename(char *bf, size_t size,
1489 					      struct syscall_arg *arg)
1490 {
1491 	unsigned long ptr = arg->val;
1492 
1493 	if (arg->augmented.args)
1494 		return syscall_arg__scnprintf_augmented_string(arg, bf, size);
1495 
1496 	if (!arg->trace->vfs_getname)
1497 		return scnprintf(bf, size, "%#x", ptr);
1498 
1499 	thread__set_filename_pos(arg->thread, bf, ptr);
1500 	return 0;
1501 }
1502 
1503 static bool trace__filter_duration(struct trace *trace, double t)
1504 {
1505 	return t < (trace->duration_filter * NSEC_PER_MSEC);
1506 }
1507 
1508 static size_t __trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
1509 {
1510 	double ts = (double)(tstamp - trace->base_time) / NSEC_PER_MSEC;
1511 
1512 	return fprintf(fp, "%10.3f ", ts);
1513 }
1514 
1515 /*
1516  * We're handling tstamp=0 as an undefined tstamp, i.e. like when we are
1517  * using ttrace->entry_time for a thread that receives a sys_exit without
1518  * first having received a sys_enter ("poll" issued before tracing session
1519  * starts, lost sys_enter exit due to ring buffer overflow).
1520  */
1521 static size_t trace__fprintf_tstamp(struct trace *trace, u64 tstamp, FILE *fp)
1522 {
1523 	if (tstamp > 0)
1524 		return __trace__fprintf_tstamp(trace, tstamp, fp);
1525 
1526 	return fprintf(fp, "         ? ");
1527 }
1528 
1529 static bool done = false;
1530 static bool interrupted = false;
1531 
1532 static void sig_handler(int sig)
1533 {
1534 	done = true;
1535 	interrupted = sig == SIGINT;
1536 }
1537 
1538 static size_t trace__fprintf_comm_tid(struct trace *trace, struct thread *thread, FILE *fp)
1539 {
1540 	size_t printed = 0;
1541 
1542 	if (trace->multiple_threads) {
1543 		if (trace->show_comm)
1544 			printed += fprintf(fp, "%.14s/", thread__comm_str(thread));
1545 		printed += fprintf(fp, "%d ", thread->tid);
1546 	}
1547 
1548 	return printed;
1549 }
1550 
1551 static size_t trace__fprintf_entry_head(struct trace *trace, struct thread *thread,
1552 					u64 duration, bool duration_calculated, u64 tstamp, FILE *fp)
1553 {
1554 	size_t printed = 0;
1555 
1556 	if (trace->show_tstamp)
1557 		printed = trace__fprintf_tstamp(trace, tstamp, fp);
1558 	if (trace->show_duration)
1559 		printed += fprintf_duration(duration, duration_calculated, fp);
1560 	return printed + trace__fprintf_comm_tid(trace, thread, fp);
1561 }
1562 
1563 static int trace__process_event(struct trace *trace, struct machine *machine,
1564 				union perf_event *event, struct perf_sample *sample)
1565 {
1566 	int ret = 0;
1567 
1568 	switch (event->header.type) {
1569 	case PERF_RECORD_LOST:
1570 		color_fprintf(trace->output, PERF_COLOR_RED,
1571 			      "LOST %" PRIu64 " events!\n", event->lost.lost);
1572 		ret = machine__process_lost_event(machine, event, sample);
1573 		break;
1574 	default:
1575 		ret = machine__process_event(machine, event, sample);
1576 		break;
1577 	}
1578 
1579 	return ret;
1580 }
1581 
1582 static int trace__tool_process(struct perf_tool *tool,
1583 			       union perf_event *event,
1584 			       struct perf_sample *sample,
1585 			       struct machine *machine)
1586 {
1587 	struct trace *trace = container_of(tool, struct trace, tool);
1588 	return trace__process_event(trace, machine, event, sample);
1589 }
1590 
1591 static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long long *addrp, char **modp)
1592 {
1593 	struct machine *machine = vmachine;
1594 
1595 	if (machine->kptr_restrict_warned)
1596 		return NULL;
1597 
1598 	if (symbol_conf.kptr_restrict) {
1599 		pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
1600 			   "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
1601 			   "Kernel samples will not be resolved.\n");
1602 		machine->kptr_restrict_warned = true;
1603 		return NULL;
1604 	}
1605 
1606 	return machine__resolve_kernel_addr(vmachine, addrp, modp);
1607 }
1608 
1609 static int trace__symbols_init(struct trace *trace, struct evlist *evlist)
1610 {
1611 	int err = symbol__init(NULL);
1612 
1613 	if (err)
1614 		return err;
1615 
1616 	trace->host = machine__new_host();
1617 	if (trace->host == NULL)
1618 		return -ENOMEM;
1619 
1620 	err = trace_event__register_resolver(trace->host, trace__machine__resolve_kernel_addr);
1621 	if (err < 0)
1622 		goto out;
1623 
1624 	err = __machine__synthesize_threads(trace->host, &trace->tool, &trace->opts.target,
1625 					    evlist->core.threads, trace__tool_process, false,
1626 					    1);
1627 out:
1628 	if (err)
1629 		symbol__exit();
1630 
1631 	return err;
1632 }
1633 
1634 static void trace__symbols__exit(struct trace *trace)
1635 {
1636 	machine__exit(trace->host);
1637 	trace->host = NULL;
1638 
1639 	symbol__exit();
1640 }
1641 
1642 static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
1643 {
1644 	int idx;
1645 
1646 	if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
1647 		nr_args = sc->fmt->nr_args;
1648 
1649 	sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
1650 	if (sc->arg_fmt == NULL)
1651 		return -1;
1652 
1653 	for (idx = 0; idx < nr_args; ++idx) {
1654 		if (sc->fmt)
1655 			sc->arg_fmt[idx] = sc->fmt->arg[idx];
1656 	}
1657 
1658 	sc->nr_args = nr_args;
1659 	return 0;
1660 }
1661 
1662 static struct syscall_arg_fmt syscall_arg_fmts__by_name[] = {
1663 	{ .name = "msr",	.scnprintf = SCA_X86_MSR,	  .strtoul = STUL_X86_MSR,	   },
1664 	{ .name = "vector",	.scnprintf = SCA_X86_IRQ_VECTORS, .strtoul = STUL_X86_IRQ_VECTORS, },
1665 };
1666 
1667 static int syscall_arg_fmt__cmp(const void *name, const void *fmtp)
1668 {
1669        const struct syscall_arg_fmt *fmt = fmtp;
1670        return strcmp(name, fmt->name);
1671 }
1672 
1673 static struct syscall_arg_fmt *
1674 __syscall_arg_fmt__find_by_name(struct syscall_arg_fmt *fmts, const int nmemb, const char *name)
1675 {
1676        return bsearch(name, fmts, nmemb, sizeof(struct syscall_arg_fmt), syscall_arg_fmt__cmp);
1677 }
1678 
1679 static struct syscall_arg_fmt *syscall_arg_fmt__find_by_name(const char *name)
1680 {
1681        const int nmemb = ARRAY_SIZE(syscall_arg_fmts__by_name);
1682        return __syscall_arg_fmt__find_by_name(syscall_arg_fmts__by_name, nmemb, name);
1683 }
1684 
1685 static struct tep_format_field *
1686 syscall_arg_fmt__init_array(struct syscall_arg_fmt *arg, struct tep_format_field *field)
1687 {
1688 	struct tep_format_field *last_field = NULL;
1689 	int len;
1690 
1691 	for (; field; field = field->next, ++arg) {
1692 		last_field = field;
1693 
1694 		if (arg->scnprintf)
1695 			continue;
1696 
1697 		len = strlen(field->name);
1698 
1699 		if (strcmp(field->type, "const char *") == 0 &&
1700 		    ((len >= 4 && strcmp(field->name + len - 4, "name") == 0) ||
1701 		     strstr(field->name, "path") != NULL))
1702 			arg->scnprintf = SCA_FILENAME;
1703 		else if ((field->flags & TEP_FIELD_IS_POINTER) || strstr(field->name, "addr"))
1704 			arg->scnprintf = SCA_PTR;
1705 		else if (strcmp(field->type, "pid_t") == 0)
1706 			arg->scnprintf = SCA_PID;
1707 		else if (strcmp(field->type, "umode_t") == 0)
1708 			arg->scnprintf = SCA_MODE_T;
1709 		else if ((field->flags & TEP_FIELD_IS_ARRAY) && strstr(field->type, "char")) {
1710 			arg->scnprintf = SCA_CHAR_ARRAY;
1711 			arg->nr_entries = field->arraylen;
1712 		} else if ((strcmp(field->type, "int") == 0 ||
1713 			  strcmp(field->type, "unsigned int") == 0 ||
1714 			  strcmp(field->type, "long") == 0) &&
1715 			 len >= 2 && strcmp(field->name + len - 2, "fd") == 0) {
1716 			/*
1717 			 * /sys/kernel/tracing/events/syscalls/sys_enter*
1718 			 * egrep 'field:.*fd;' .../format|sed -r 's/.*field:([a-z ]+) [a-z_]*fd.+/\1/g'|sort|uniq -c
1719 			 * 65 int
1720 			 * 23 unsigned int
1721 			 * 7 unsigned long
1722 			 */
1723 			arg->scnprintf = SCA_FD;
1724                } else {
1725 			struct syscall_arg_fmt *fmt = syscall_arg_fmt__find_by_name(field->name);
1726 
1727 			if (fmt) {
1728 				arg->scnprintf = fmt->scnprintf;
1729 				arg->strtoul   = fmt->strtoul;
1730 			}
1731 		}
1732 	}
1733 
1734 	return last_field;
1735 }
1736 
1737 static int syscall__set_arg_fmts(struct syscall *sc)
1738 {
1739 	struct tep_format_field *last_field = syscall_arg_fmt__init_array(sc->arg_fmt, sc->args);
1740 
1741 	if (last_field)
1742 		sc->args_size = last_field->offset + last_field->size;
1743 
1744 	return 0;
1745 }
1746 
1747 static int trace__read_syscall_info(struct trace *trace, int id)
1748 {
1749 	char tp_name[128];
1750 	struct syscall *sc;
1751 	const char *name = syscalltbl__name(trace->sctbl, id);
1752 
1753 	if (trace->syscalls.table == NULL) {
1754 		trace->syscalls.table = calloc(trace->sctbl->syscalls.max_id + 1, sizeof(*sc));
1755 		if (trace->syscalls.table == NULL)
1756 			return -ENOMEM;
1757 	}
1758 
1759 	sc = trace->syscalls.table + id;
1760 	if (sc->nonexistent)
1761 		return 0;
1762 
1763 	if (name == NULL) {
1764 		sc->nonexistent = true;
1765 		return 0;
1766 	}
1767 
1768 	sc->name = name;
1769 	sc->fmt  = syscall_fmt__find(sc->name);
1770 
1771 	snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->name);
1772 	sc->tp_format = trace_event__tp_format("syscalls", tp_name);
1773 
1774 	if (IS_ERR(sc->tp_format) && sc->fmt && sc->fmt->alias) {
1775 		snprintf(tp_name, sizeof(tp_name), "sys_enter_%s", sc->fmt->alias);
1776 		sc->tp_format = trace_event__tp_format("syscalls", tp_name);
1777 	}
1778 
1779 	if (syscall__alloc_arg_fmts(sc, IS_ERR(sc->tp_format) ? 6 : sc->tp_format->format.nr_fields))
1780 		return -ENOMEM;
1781 
1782 	if (IS_ERR(sc->tp_format))
1783 		return PTR_ERR(sc->tp_format);
1784 
1785 	sc->args = sc->tp_format->format.fields;
1786 	/*
1787 	 * We need to check and discard the first variable '__syscall_nr'
1788 	 * or 'nr' that mean the syscall number. It is needless here.
1789 	 * So drop '__syscall_nr' or 'nr' field but does not exist on older kernels.
1790 	 */
1791 	if (sc->args && (!strcmp(sc->args->name, "__syscall_nr") || !strcmp(sc->args->name, "nr"))) {
1792 		sc->args = sc->args->next;
1793 		--sc->nr_args;
1794 	}
1795 
1796 	sc->is_exit = !strcmp(name, "exit_group") || !strcmp(name, "exit");
1797 	sc->is_open = !strcmp(name, "open") || !strcmp(name, "openat");
1798 
1799 	return syscall__set_arg_fmts(sc);
1800 }
1801 
1802 static int perf_evsel__init_tp_arg_scnprintf(struct evsel *evsel)
1803 {
1804 	struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);
1805 
1806 	if (fmt != NULL) {
1807 		syscall_arg_fmt__init_array(fmt, evsel->tp_format->format.fields);
1808 		return 0;
1809 	}
1810 
1811 	return -ENOMEM;
1812 }
1813 
1814 static int intcmp(const void *a, const void *b)
1815 {
1816 	const int *one = a, *another = b;
1817 
1818 	return *one - *another;
1819 }
1820 
1821 static int trace__validate_ev_qualifier(struct trace *trace)
1822 {
1823 	int err = 0;
1824 	bool printed_invalid_prefix = false;
1825 	struct str_node *pos;
1826 	size_t nr_used = 0, nr_allocated = strlist__nr_entries(trace->ev_qualifier);
1827 
1828 	trace->ev_qualifier_ids.entries = malloc(nr_allocated *
1829 						 sizeof(trace->ev_qualifier_ids.entries[0]));
1830 
1831 	if (trace->ev_qualifier_ids.entries == NULL) {
1832 		fputs("Error:\tNot enough memory for allocating events qualifier ids\n",
1833 		       trace->output);
1834 		err = -EINVAL;
1835 		goto out;
1836 	}
1837 
1838 	strlist__for_each_entry(pos, trace->ev_qualifier) {
1839 		const char *sc = pos->s;
1840 		int id = syscalltbl__id(trace->sctbl, sc), match_next = -1;
1841 
1842 		if (id < 0) {
1843 			id = syscalltbl__strglobmatch_first(trace->sctbl, sc, &match_next);
1844 			if (id >= 0)
1845 				goto matches;
1846 
1847 			if (!printed_invalid_prefix) {
1848 				pr_debug("Skipping unknown syscalls: ");
1849 				printed_invalid_prefix = true;
1850 			} else {
1851 				pr_debug(", ");
1852 			}
1853 
1854 			pr_debug("%s", sc);
1855 			continue;
1856 		}
1857 matches:
1858 		trace->ev_qualifier_ids.entries[nr_used++] = id;
1859 		if (match_next == -1)
1860 			continue;
1861 
1862 		while (1) {
1863 			id = syscalltbl__strglobmatch_next(trace->sctbl, sc, &match_next);
1864 			if (id < 0)
1865 				break;
1866 			if (nr_allocated == nr_used) {
1867 				void *entries;
1868 
1869 				nr_allocated += 8;
1870 				entries = realloc(trace->ev_qualifier_ids.entries,
1871 						  nr_allocated * sizeof(trace->ev_qualifier_ids.entries[0]));
1872 				if (entries == NULL) {
1873 					err = -ENOMEM;
1874 					fputs("\nError:\t Not enough memory for parsing\n", trace->output);
1875 					goto out_free;
1876 				}
1877 				trace->ev_qualifier_ids.entries = entries;
1878 			}
1879 			trace->ev_qualifier_ids.entries[nr_used++] = id;
1880 		}
1881 	}
1882 
1883 	trace->ev_qualifier_ids.nr = nr_used;
1884 	qsort(trace->ev_qualifier_ids.entries, nr_used, sizeof(int), intcmp);
1885 out:
1886 	if (printed_invalid_prefix)
1887 		pr_debug("\n");
1888 	return err;
1889 out_free:
1890 	zfree(&trace->ev_qualifier_ids.entries);
1891 	trace->ev_qualifier_ids.nr = 0;
1892 	goto out;
1893 }
1894 
1895 static __maybe_unused bool trace__syscall_enabled(struct trace *trace, int id)
1896 {
1897 	bool in_ev_qualifier;
1898 
1899 	if (trace->ev_qualifier_ids.nr == 0)
1900 		return true;
1901 
1902 	in_ev_qualifier = bsearch(&id, trace->ev_qualifier_ids.entries,
1903 				  trace->ev_qualifier_ids.nr, sizeof(int), intcmp) != NULL;
1904 
1905 	if (in_ev_qualifier)
1906 	       return !trace->not_ev_qualifier;
1907 
1908 	return trace->not_ev_qualifier;
1909 }
1910 
1911 /*
1912  * args is to be interpreted as a series of longs but we need to handle
1913  * 8-byte unaligned accesses. args points to raw_data within the event
1914  * and raw_data is guaranteed to be 8-byte unaligned because it is
1915  * preceded by raw_size which is a u32. So we need to copy args to a temp
1916  * variable to read it. Most notably this avoids extended load instructions
1917  * on unaligned addresses
1918  */
1919 unsigned long syscall_arg__val(struct syscall_arg *arg, u8 idx)
1920 {
1921 	unsigned long val;
1922 	unsigned char *p = arg->args + sizeof(unsigned long) * idx;
1923 
1924 	memcpy(&val, p, sizeof(val));
1925 	return val;
1926 }
1927 
1928 static size_t syscall__scnprintf_name(struct syscall *sc, char *bf, size_t size,
1929 				      struct syscall_arg *arg)
1930 {
1931 	if (sc->arg_fmt && sc->arg_fmt[arg->idx].name)
1932 		return scnprintf(bf, size, "%s: ", sc->arg_fmt[arg->idx].name);
1933 
1934 	return scnprintf(bf, size, "arg%d: ", arg->idx);
1935 }
1936 
1937 /*
1938  * Check if the value is in fact zero, i.e. mask whatever needs masking, such
1939  * as mount 'flags' argument that needs ignoring some magic flag, see comment
1940  * in tools/perf/trace/beauty/mount_flags.c
1941  */
1942 static unsigned long syscall_arg_fmt__mask_val(struct syscall_arg_fmt *fmt, struct syscall_arg *arg, unsigned long val)
1943 {
1944 	if (fmt && fmt->mask_val)
1945 		return fmt->mask_val(arg, val);
1946 
1947 	return val;
1948 }
1949 
1950 static size_t syscall_arg_fmt__scnprintf_val(struct syscall_arg_fmt *fmt, char *bf, size_t size,
1951 					     struct syscall_arg *arg, unsigned long val)
1952 {
1953 	if (fmt && fmt->scnprintf) {
1954 		arg->val = val;
1955 		if (fmt->parm)
1956 			arg->parm = fmt->parm;
1957 		return fmt->scnprintf(bf, size, arg);
1958 	}
1959 	return scnprintf(bf, size, "%ld", val);
1960 }
1961 
1962 static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
1963 				      unsigned char *args, void *augmented_args, int augmented_args_size,
1964 				      struct trace *trace, struct thread *thread)
1965 {
1966 	size_t printed = 0;
1967 	unsigned long val;
1968 	u8 bit = 1;
1969 	struct syscall_arg arg = {
1970 		.args	= args,
1971 		.augmented = {
1972 			.size = augmented_args_size,
1973 			.args = augmented_args,
1974 		},
1975 		.idx	= 0,
1976 		.mask	= 0,
1977 		.trace  = trace,
1978 		.thread = thread,
1979 		.show_string_prefix = trace->show_string_prefix,
1980 	};
1981 	struct thread_trace *ttrace = thread__priv(thread);
1982 
1983 	/*
1984 	 * Things like fcntl will set this in its 'cmd' formatter to pick the
1985 	 * right formatter for the return value (an fd? file flags?), which is
1986 	 * not needed for syscalls that always return a given type, say an fd.
1987 	 */
1988 	ttrace->ret_scnprintf = NULL;
1989 
1990 	if (sc->args != NULL) {
1991 		struct tep_format_field *field;
1992 
1993 		for (field = sc->args; field;
1994 		     field = field->next, ++arg.idx, bit <<= 1) {
1995 			if (arg.mask & bit)
1996 				continue;
1997 
1998 			arg.fmt = &sc->arg_fmt[arg.idx];
1999 			val = syscall_arg__val(&arg, arg.idx);
2000 			/*
2001 			 * Some syscall args need some mask, most don't and
2002 			 * return val untouched.
2003 			 */
2004 			val = syscall_arg_fmt__mask_val(&sc->arg_fmt[arg.idx], &arg, val);
2005 
2006 			/*
2007  			 * Suppress this argument if its value is zero and
2008  			 * and we don't have a string associated in an
2009  			 * strarray for it.
2010  			 */
2011 			if (val == 0 &&
2012 			    !trace->show_zeros &&
2013 			    !(sc->arg_fmt &&
2014 			      (sc->arg_fmt[arg.idx].show_zero ||
2015 			       sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAY ||
2016 			       sc->arg_fmt[arg.idx].scnprintf == SCA_STRARRAYS) &&
2017 			      sc->arg_fmt[arg.idx].parm))
2018 				continue;
2019 
2020 			printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
2021 
2022 			if (trace->show_arg_names)
2023 				printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
2024 
2025 			printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx],
2026 								  bf + printed, size - printed, &arg, val);
2027 		}
2028 	} else if (IS_ERR(sc->tp_format)) {
2029 		/*
2030 		 * If we managed to read the tracepoint /format file, then we
2031 		 * may end up not having any args, like with gettid(), so only
2032 		 * print the raw args when we didn't manage to read it.
2033 		 */
2034 		while (arg.idx < sc->nr_args) {
2035 			if (arg.mask & bit)
2036 				goto next_arg;
2037 			val = syscall_arg__val(&arg, arg.idx);
2038 			if (printed)
2039 				printed += scnprintf(bf + printed, size - printed, ", ");
2040 			printed += syscall__scnprintf_name(sc, bf + printed, size - printed, &arg);
2041 			printed += syscall_arg_fmt__scnprintf_val(&sc->arg_fmt[arg.idx], bf + printed, size - printed, &arg, val);
2042 next_arg:
2043 			++arg.idx;
2044 			bit <<= 1;
2045 		}
2046 	}
2047 
2048 	return printed;
2049 }
2050 
2051 typedef int (*tracepoint_handler)(struct trace *trace, struct evsel *evsel,
2052 				  union perf_event *event,
2053 				  struct perf_sample *sample);
2054 
2055 static struct syscall *trace__syscall_info(struct trace *trace,
2056 					   struct evsel *evsel, int id)
2057 {
2058 	int err = 0;
2059 
2060 	if (id < 0) {
2061 
2062 		/*
2063 		 * XXX: Noticed on x86_64, reproduced as far back as 3.0.36, haven't tried
2064 		 * before that, leaving at a higher verbosity level till that is
2065 		 * explained. Reproduced with plain ftrace with:
2066 		 *
2067 		 * echo 1 > /t/events/raw_syscalls/sys_exit/enable
2068 		 * grep "NR -1 " /t/trace_pipe
2069 		 *
2070 		 * After generating some load on the machine.
2071  		 */
2072 		if (verbose > 1) {
2073 			static u64 n;
2074 			fprintf(trace->output, "Invalid syscall %d id, skipping (%s, %" PRIu64 ") ...\n",
2075 				id, perf_evsel__name(evsel), ++n);
2076 		}
2077 		return NULL;
2078 	}
2079 
2080 	err = -EINVAL;
2081 
2082 	if (id > trace->sctbl->syscalls.max_id)
2083 		goto out_cant_read;
2084 
2085 	if ((trace->syscalls.table == NULL || trace->syscalls.table[id].name == NULL) &&
2086 	    (err = trace__read_syscall_info(trace, id)) != 0)
2087 		goto out_cant_read;
2088 
2089 	if (trace->syscalls.table[id].name == NULL) {
2090 		if (trace->syscalls.table[id].nonexistent)
2091 			return NULL;
2092 		goto out_cant_read;
2093 	}
2094 
2095 	return &trace->syscalls.table[id];
2096 
2097 out_cant_read:
2098 	if (verbose > 0) {
2099 		char sbuf[STRERR_BUFSIZE];
2100 		fprintf(trace->output, "Problems reading syscall %d: %d (%s)", id, -err, str_error_r(-err, sbuf, sizeof(sbuf)));
2101 		if (id <= trace->sctbl->syscalls.max_id && trace->syscalls.table[id].name != NULL)
2102 			fprintf(trace->output, "(%s)", trace->syscalls.table[id].name);
2103 		fputs(" information\n", trace->output);
2104 	}
2105 	return NULL;
2106 }
2107 
2108 struct syscall_stats {
2109 	struct stats stats;
2110 	u64	     nr_failures;
2111 	int	     max_errno;
2112 	u32	     *errnos;
2113 };
2114 
2115 static void thread__update_stats(struct thread *thread, struct thread_trace *ttrace,
2116 				 int id, struct perf_sample *sample, long err, bool errno_summary)
2117 {
2118 	struct int_node *inode;
2119 	struct syscall_stats *stats;
2120 	u64 duration = 0;
2121 
2122 	inode = intlist__findnew(ttrace->syscall_stats, id);
2123 	if (inode == NULL)
2124 		return;
2125 
2126 	stats = inode->priv;
2127 	if (stats == NULL) {
2128 		stats = malloc(sizeof(*stats));
2129 		if (stats == NULL)
2130 			return;
2131 
2132 		stats->nr_failures = 0;
2133 		stats->max_errno   = 0;
2134 		stats->errnos	   = NULL;
2135 		init_stats(&stats->stats);
2136 		inode->priv = stats;
2137 	}
2138 
2139 	if (ttrace->entry_time && sample->time > ttrace->entry_time)
2140 		duration = sample->time - ttrace->entry_time;
2141 
2142 	update_stats(&stats->stats, duration);
2143 
2144 	if (err < 0) {
2145 		++stats->nr_failures;
2146 
2147 		if (!errno_summary)
2148 			return;
2149 
2150 		err = -err;
2151 		if (err > stats->max_errno) {
2152 			u32 *new_errnos = realloc(stats->errnos, err * sizeof(u32));
2153 
2154 			if (new_errnos) {
2155 				memset(new_errnos + stats->max_errno, 0, (err - stats->max_errno) * sizeof(u32));
2156 			} else {
2157 				pr_debug("Not enough memory for errno stats for thread \"%s\"(%d/%d), results will be incomplete\n",
2158 					 thread__comm_str(thread), thread->pid_, thread->tid);
2159 				return;
2160 			}
2161 
2162 			stats->errnos = new_errnos;
2163 			stats->max_errno = err;
2164 		}
2165 
2166 		++stats->errnos[err - 1];
2167 	}
2168 }
2169 
2170 static int trace__printf_interrupted_entry(struct trace *trace)
2171 {
2172 	struct thread_trace *ttrace;
2173 	size_t printed;
2174 	int len;
2175 
2176 	if (trace->failure_only || trace->current == NULL)
2177 		return 0;
2178 
2179 	ttrace = thread__priv(trace->current);
2180 
2181 	if (!ttrace->entry_pending)
2182 		return 0;
2183 
2184 	printed  = trace__fprintf_entry_head(trace, trace->current, 0, false, ttrace->entry_time, trace->output);
2185 	printed += len = fprintf(trace->output, "%s)", ttrace->entry_str);
2186 
2187 	if (len < trace->args_alignment - 4)
2188 		printed += fprintf(trace->output, "%-*s", trace->args_alignment - 4 - len, " ");
2189 
2190 	printed += fprintf(trace->output, " ...\n");
2191 
2192 	ttrace->entry_pending = false;
2193 	++trace->nr_events_printed;
2194 
2195 	return printed;
2196 }
2197 
2198 static int trace__fprintf_sample(struct trace *trace, struct evsel *evsel,
2199 				 struct perf_sample *sample, struct thread *thread)
2200 {
2201 	int printed = 0;
2202 
2203 	if (trace->print_sample) {
2204 		double ts = (double)sample->time / NSEC_PER_MSEC;
2205 
2206 		printed += fprintf(trace->output, "%22s %10.3f %s %d/%d [%d]\n",
2207 				   perf_evsel__name(evsel), ts,
2208 				   thread__comm_str(thread),
2209 				   sample->pid, sample->tid, sample->cpu);
2210 	}
2211 
2212 	return printed;
2213 }
2214 
2215 static void *syscall__augmented_args(struct syscall *sc, struct perf_sample *sample, int *augmented_args_size, int raw_augmented_args_size)
2216 {
2217 	void *augmented_args = NULL;
2218 	/*
2219 	 * For now with BPF raw_augmented we hook into raw_syscalls:sys_enter
2220 	 * and there we get all 6 syscall args plus the tracepoint common fields
2221 	 * that gets calculated at the start and the syscall_nr (another long).
2222 	 * So we check if that is the case and if so don't look after the
2223 	 * sc->args_size but always after the full raw_syscalls:sys_enter payload,
2224 	 * which is fixed.
2225 	 *
2226 	 * We'll revisit this later to pass s->args_size to the BPF augmenter
2227 	 * (now tools/perf/examples/bpf/augmented_raw_syscalls.c, so that it
2228 	 * copies only what we need for each syscall, like what happens when we
2229 	 * use syscalls:sys_enter_NAME, so that we reduce the kernel/userspace
2230 	 * traffic to just what is needed for each syscall.
2231 	 */
2232 	int args_size = raw_augmented_args_size ?: sc->args_size;
2233 
2234 	*augmented_args_size = sample->raw_size - args_size;
2235 	if (*augmented_args_size > 0)
2236 		augmented_args = sample->raw_data + args_size;
2237 
2238 	return augmented_args;
2239 }
2240 
2241 static int trace__sys_enter(struct trace *trace, struct evsel *evsel,
2242 			    union perf_event *event __maybe_unused,
2243 			    struct perf_sample *sample)
2244 {
2245 	char *msg;
2246 	void *args;
2247 	int printed = 0;
2248 	struct thread *thread;
2249 	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
2250 	int augmented_args_size = 0;
2251 	void *augmented_args = NULL;
2252 	struct syscall *sc = trace__syscall_info(trace, evsel, id);
2253 	struct thread_trace *ttrace;
2254 
2255 	if (sc == NULL)
2256 		return -1;
2257 
2258 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2259 	ttrace = thread__trace(thread, trace->output);
2260 	if (ttrace == NULL)
2261 		goto out_put;
2262 
2263 	trace__fprintf_sample(trace, evsel, sample, thread);
2264 
2265 	args = perf_evsel__sc_tp_ptr(evsel, args, sample);
2266 
2267 	if (ttrace->entry_str == NULL) {
2268 		ttrace->entry_str = malloc(trace__entry_str_size);
2269 		if (!ttrace->entry_str)
2270 			goto out_put;
2271 	}
2272 
2273 	if (!(trace->duration_filter || trace->summary_only || trace->min_stack))
2274 		trace__printf_interrupted_entry(trace);
2275 	/*
2276 	 * If this is raw_syscalls.sys_enter, then it always comes with the 6 possible
2277 	 * arguments, even if the syscall being handled, say "openat", uses only 4 arguments
2278 	 * this breaks syscall__augmented_args() check for augmented args, as we calculate
2279 	 * syscall->args_size using each syscalls:sys_enter_NAME tracefs format file,
2280 	 * so when handling, say the openat syscall, we end up getting 6 args for the
2281 	 * raw_syscalls:sys_enter event, when we expected just 4, we end up mistakenly
2282 	 * thinking that the extra 2 u64 args are the augmented filename, so just check
2283 	 * here and avoid using augmented syscalls when the evsel is the raw_syscalls one.
2284 	 */
2285 	if (evsel != trace->syscalls.events.sys_enter)
2286 		augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
2287 	ttrace->entry_time = sample->time;
2288 	msg = ttrace->entry_str;
2289 	printed += scnprintf(msg + printed, trace__entry_str_size - printed, "%s(", sc->name);
2290 
2291 	printed += syscall__scnprintf_args(sc, msg + printed, trace__entry_str_size - printed,
2292 					   args, augmented_args, augmented_args_size, trace, thread);
2293 
2294 	if (sc->is_exit) {
2295 		if (!(trace->duration_filter || trace->summary_only || trace->failure_only || trace->min_stack)) {
2296 			int alignment = 0;
2297 
2298 			trace__fprintf_entry_head(trace, thread, 0, false, ttrace->entry_time, trace->output);
2299 			printed = fprintf(trace->output, "%s)", ttrace->entry_str);
2300 			if (trace->args_alignment > printed)
2301 				alignment = trace->args_alignment - printed;
2302 			fprintf(trace->output, "%*s= ?\n", alignment, " ");
2303 		}
2304 	} else {
2305 		ttrace->entry_pending = true;
2306 		/* See trace__vfs_getname & trace__sys_exit */
2307 		ttrace->filename.pending_open = false;
2308 	}
2309 
2310 	if (trace->current != thread) {
2311 		thread__put(trace->current);
2312 		trace->current = thread__get(thread);
2313 	}
2314 	err = 0;
2315 out_put:
2316 	thread__put(thread);
2317 	return err;
2318 }
2319 
2320 static int trace__fprintf_sys_enter(struct trace *trace, struct evsel *evsel,
2321 				    struct perf_sample *sample)
2322 {
2323 	struct thread_trace *ttrace;
2324 	struct thread *thread;
2325 	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1;
2326 	struct syscall *sc = trace__syscall_info(trace, evsel, id);
2327 	char msg[1024];
2328 	void *args, *augmented_args = NULL;
2329 	int augmented_args_size;
2330 
2331 	if (sc == NULL)
2332 		return -1;
2333 
2334 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2335 	ttrace = thread__trace(thread, trace->output);
2336 	/*
2337 	 * We need to get ttrace just to make sure it is there when syscall__scnprintf_args()
2338 	 * and the rest of the beautifiers accessing it via struct syscall_arg touches it.
2339 	 */
2340 	if (ttrace == NULL)
2341 		goto out_put;
2342 
2343 	args = perf_evsel__sc_tp_ptr(evsel, args, sample);
2344 	augmented_args = syscall__augmented_args(sc, sample, &augmented_args_size, trace->raw_augmented_syscalls_args_size);
2345 	syscall__scnprintf_args(sc, msg, sizeof(msg), args, augmented_args, augmented_args_size, trace, thread);
2346 	fprintf(trace->output, "%s", msg);
2347 	err = 0;
2348 out_put:
2349 	thread__put(thread);
2350 	return err;
2351 }
2352 
2353 static int trace__resolve_callchain(struct trace *trace, struct evsel *evsel,
2354 				    struct perf_sample *sample,
2355 				    struct callchain_cursor *cursor)
2356 {
2357 	struct addr_location al;
2358 	int max_stack = evsel->core.attr.sample_max_stack ?
2359 			evsel->core.attr.sample_max_stack :
2360 			trace->max_stack;
2361 	int err;
2362 
2363 	if (machine__resolve(trace->host, &al, sample) < 0)
2364 		return -1;
2365 
2366 	err = thread__resolve_callchain(al.thread, cursor, evsel, sample, NULL, NULL, max_stack);
2367 	addr_location__put(&al);
2368 	return err;
2369 }
2370 
2371 static int trace__fprintf_callchain(struct trace *trace, struct perf_sample *sample)
2372 {
2373 	/* TODO: user-configurable print_opts */
2374 	const unsigned int print_opts = EVSEL__PRINT_SYM |
2375 				        EVSEL__PRINT_DSO |
2376 				        EVSEL__PRINT_UNKNOWN_AS_ADDR;
2377 
2378 	return sample__fprintf_callchain(sample, 38, print_opts, &callchain_cursor, symbol_conf.bt_stop_list, trace->output);
2379 }
2380 
2381 static const char *errno_to_name(struct evsel *evsel, int err)
2382 {
2383 	struct perf_env *env = perf_evsel__env(evsel);
2384 	const char *arch_name = perf_env__arch(env);
2385 
2386 	return arch_syscalls__strerrno(arch_name, err);
2387 }
2388 
2389 static int trace__sys_exit(struct trace *trace, struct evsel *evsel,
2390 			   union perf_event *event __maybe_unused,
2391 			   struct perf_sample *sample)
2392 {
2393 	long ret;
2394 	u64 duration = 0;
2395 	bool duration_calculated = false;
2396 	struct thread *thread;
2397 	int id = perf_evsel__sc_tp_uint(evsel, id, sample), err = -1, callchain_ret = 0, printed = 0;
2398 	int alignment = trace->args_alignment;
2399 	struct syscall *sc = trace__syscall_info(trace, evsel, id);
2400 	struct thread_trace *ttrace;
2401 
2402 	if (sc == NULL)
2403 		return -1;
2404 
2405 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2406 	ttrace = thread__trace(thread, trace->output);
2407 	if (ttrace == NULL)
2408 		goto out_put;
2409 
2410 	trace__fprintf_sample(trace, evsel, sample, thread);
2411 
2412 	ret = perf_evsel__sc_tp_uint(evsel, ret, sample);
2413 
2414 	if (trace->summary)
2415 		thread__update_stats(thread, ttrace, id, sample, ret, trace->errno_summary);
2416 
2417 	if (!trace->fd_path_disabled && sc->is_open && ret >= 0 && ttrace->filename.pending_open) {
2418 		trace__set_fd_pathname(thread, ret, ttrace->filename.name);
2419 		ttrace->filename.pending_open = false;
2420 		++trace->stats.vfs_getname;
2421 	}
2422 
2423 	if (ttrace->entry_time) {
2424 		duration = sample->time - ttrace->entry_time;
2425 		if (trace__filter_duration(trace, duration))
2426 			goto out;
2427 		duration_calculated = true;
2428 	} else if (trace->duration_filter)
2429 		goto out;
2430 
2431 	if (sample->callchain) {
2432 		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2433 		if (callchain_ret == 0) {
2434 			if (callchain_cursor.nr < trace->min_stack)
2435 				goto out;
2436 			callchain_ret = 1;
2437 		}
2438 	}
2439 
2440 	if (trace->summary_only || (ret >= 0 && trace->failure_only))
2441 		goto out;
2442 
2443 	trace__fprintf_entry_head(trace, thread, duration, duration_calculated, ttrace->entry_time, trace->output);
2444 
2445 	if (ttrace->entry_pending) {
2446 		printed = fprintf(trace->output, "%s", ttrace->entry_str);
2447 	} else {
2448 		printed += fprintf(trace->output, " ... [");
2449 		color_fprintf(trace->output, PERF_COLOR_YELLOW, "continued");
2450 		printed += 9;
2451 		printed += fprintf(trace->output, "]: %s()", sc->name);
2452 	}
2453 
2454 	printed++; /* the closing ')' */
2455 
2456 	if (alignment > printed)
2457 		alignment -= printed;
2458 	else
2459 		alignment = 0;
2460 
2461 	fprintf(trace->output, ")%*s= ", alignment, " ");
2462 
2463 	if (sc->fmt == NULL) {
2464 		if (ret < 0)
2465 			goto errno_print;
2466 signed_print:
2467 		fprintf(trace->output, "%ld", ret);
2468 	} else if (ret < 0) {
2469 errno_print: {
2470 		char bf[STRERR_BUFSIZE];
2471 		const char *emsg = str_error_r(-ret, bf, sizeof(bf)),
2472 			   *e = errno_to_name(evsel, -ret);
2473 
2474 		fprintf(trace->output, "-1 %s (%s)", e, emsg);
2475 	}
2476 	} else if (ret == 0 && sc->fmt->timeout)
2477 		fprintf(trace->output, "0 (Timeout)");
2478 	else if (ttrace->ret_scnprintf) {
2479 		char bf[1024];
2480 		struct syscall_arg arg = {
2481 			.val	= ret,
2482 			.thread	= thread,
2483 			.trace	= trace,
2484 		};
2485 		ttrace->ret_scnprintf(bf, sizeof(bf), &arg);
2486 		ttrace->ret_scnprintf = NULL;
2487 		fprintf(trace->output, "%s", bf);
2488 	} else if (sc->fmt->hexret)
2489 		fprintf(trace->output, "%#lx", ret);
2490 	else if (sc->fmt->errpid) {
2491 		struct thread *child = machine__find_thread(trace->host, ret, ret);
2492 
2493 		if (child != NULL) {
2494 			fprintf(trace->output, "%ld", ret);
2495 			if (child->comm_set)
2496 				fprintf(trace->output, " (%s)", thread__comm_str(child));
2497 			thread__put(child);
2498 		}
2499 	} else
2500 		goto signed_print;
2501 
2502 	fputc('\n', trace->output);
2503 
2504 	/*
2505 	 * We only consider an 'event' for the sake of --max-events a non-filtered
2506 	 * sys_enter + sys_exit and other tracepoint events.
2507 	 */
2508 	if (++trace->nr_events_printed == trace->max_events && trace->max_events != ULONG_MAX)
2509 		interrupted = true;
2510 
2511 	if (callchain_ret > 0)
2512 		trace__fprintf_callchain(trace, sample);
2513 	else if (callchain_ret < 0)
2514 		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
2515 out:
2516 	ttrace->entry_pending = false;
2517 	err = 0;
2518 out_put:
2519 	thread__put(thread);
2520 	return err;
2521 }
2522 
2523 static int trace__vfs_getname(struct trace *trace, struct evsel *evsel,
2524 			      union perf_event *event __maybe_unused,
2525 			      struct perf_sample *sample)
2526 {
2527 	struct thread *thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2528 	struct thread_trace *ttrace;
2529 	size_t filename_len, entry_str_len, to_move;
2530 	ssize_t remaining_space;
2531 	char *pos;
2532 	const char *filename = perf_evsel__rawptr(evsel, sample, "pathname");
2533 
2534 	if (!thread)
2535 		goto out;
2536 
2537 	ttrace = thread__priv(thread);
2538 	if (!ttrace)
2539 		goto out_put;
2540 
2541 	filename_len = strlen(filename);
2542 	if (filename_len == 0)
2543 		goto out_put;
2544 
2545 	if (ttrace->filename.namelen < filename_len) {
2546 		char *f = realloc(ttrace->filename.name, filename_len + 1);
2547 
2548 		if (f == NULL)
2549 			goto out_put;
2550 
2551 		ttrace->filename.namelen = filename_len;
2552 		ttrace->filename.name = f;
2553 	}
2554 
2555 	strcpy(ttrace->filename.name, filename);
2556 	ttrace->filename.pending_open = true;
2557 
2558 	if (!ttrace->filename.ptr)
2559 		goto out_put;
2560 
2561 	entry_str_len = strlen(ttrace->entry_str);
2562 	remaining_space = trace__entry_str_size - entry_str_len - 1; /* \0 */
2563 	if (remaining_space <= 0)
2564 		goto out_put;
2565 
2566 	if (filename_len > (size_t)remaining_space) {
2567 		filename += filename_len - remaining_space;
2568 		filename_len = remaining_space;
2569 	}
2570 
2571 	to_move = entry_str_len - ttrace->filename.entry_str_pos + 1; /* \0 */
2572 	pos = ttrace->entry_str + ttrace->filename.entry_str_pos;
2573 	memmove(pos + filename_len, pos, to_move);
2574 	memcpy(pos, filename, filename_len);
2575 
2576 	ttrace->filename.ptr = 0;
2577 	ttrace->filename.entry_str_pos = 0;
2578 out_put:
2579 	thread__put(thread);
2580 out:
2581 	return 0;
2582 }
2583 
2584 static int trace__sched_stat_runtime(struct trace *trace, struct evsel *evsel,
2585 				     union perf_event *event __maybe_unused,
2586 				     struct perf_sample *sample)
2587 {
2588         u64 runtime = perf_evsel__intval(evsel, sample, "runtime");
2589 	double runtime_ms = (double)runtime / NSEC_PER_MSEC;
2590 	struct thread *thread = machine__findnew_thread(trace->host,
2591 							sample->pid,
2592 							sample->tid);
2593 	struct thread_trace *ttrace = thread__trace(thread, trace->output);
2594 
2595 	if (ttrace == NULL)
2596 		goto out_dump;
2597 
2598 	ttrace->runtime_ms += runtime_ms;
2599 	trace->runtime_ms += runtime_ms;
2600 out_put:
2601 	thread__put(thread);
2602 	return 0;
2603 
2604 out_dump:
2605 	fprintf(trace->output, "%s: comm=%s,pid=%u,runtime=%" PRIu64 ",vruntime=%" PRIu64 ")\n",
2606 	       evsel->name,
2607 	       perf_evsel__strval(evsel, sample, "comm"),
2608 	       (pid_t)perf_evsel__intval(evsel, sample, "pid"),
2609 	       runtime,
2610 	       perf_evsel__intval(evsel, sample, "vruntime"));
2611 	goto out_put;
2612 }
2613 
2614 static int bpf_output__printer(enum binary_printer_ops op,
2615 			       unsigned int val, void *extra __maybe_unused, FILE *fp)
2616 {
2617 	unsigned char ch = (unsigned char)val;
2618 
2619 	switch (op) {
2620 	case BINARY_PRINT_CHAR_DATA:
2621 		return fprintf(fp, "%c", isprint(ch) ? ch : '.');
2622 	case BINARY_PRINT_DATA_BEGIN:
2623 	case BINARY_PRINT_LINE_BEGIN:
2624 	case BINARY_PRINT_ADDR:
2625 	case BINARY_PRINT_NUM_DATA:
2626 	case BINARY_PRINT_NUM_PAD:
2627 	case BINARY_PRINT_SEP:
2628 	case BINARY_PRINT_CHAR_PAD:
2629 	case BINARY_PRINT_LINE_END:
2630 	case BINARY_PRINT_DATA_END:
2631 	default:
2632 		break;
2633 	}
2634 
2635 	return 0;
2636 }
2637 
2638 static void bpf_output__fprintf(struct trace *trace,
2639 				struct perf_sample *sample)
2640 {
2641 	binary__fprintf(sample->raw_data, sample->raw_size, 8,
2642 			bpf_output__printer, NULL, trace->output);
2643 	++trace->nr_events_printed;
2644 }
2645 
2646 static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel, struct perf_sample *sample,
2647 				       struct thread *thread, void *augmented_args, int augmented_args_size)
2648 {
2649 	char bf[2048];
2650 	size_t size = sizeof(bf);
2651 	struct tep_format_field *field = evsel->tp_format->format.fields;
2652 	struct syscall_arg_fmt *arg = __evsel__syscall_arg_fmt(evsel);
2653 	size_t printed = 0;
2654 	unsigned long val;
2655 	u8 bit = 1;
2656 	struct syscall_arg syscall_arg = {
2657 		.augmented = {
2658 			.size = augmented_args_size,
2659 			.args = augmented_args,
2660 		},
2661 		.idx	= 0,
2662 		.mask	= 0,
2663 		.trace  = trace,
2664 		.thread = thread,
2665 		.show_string_prefix = trace->show_string_prefix,
2666 	};
2667 
2668 	for (; field && arg; field = field->next, ++syscall_arg.idx, bit <<= 1, ++arg) {
2669 		if (syscall_arg.mask & bit)
2670 			continue;
2671 
2672 		syscall_arg.len = 0;
2673 		syscall_arg.fmt = arg;
2674 		if (field->flags & TEP_FIELD_IS_ARRAY) {
2675 			int offset = field->offset;
2676 
2677 			if (field->flags & TEP_FIELD_IS_DYNAMIC) {
2678 				offset = format_field__intval(field, sample, evsel->needs_swap);
2679 				syscall_arg.len = offset >> 16;
2680 				offset &= 0xffff;
2681 			}
2682 
2683 			val = (uintptr_t)(sample->raw_data + offset);
2684 		} else
2685 			val = format_field__intval(field, sample, evsel->needs_swap);
2686 		/*
2687 		 * Some syscall args need some mask, most don't and
2688 		 * return val untouched.
2689 		 */
2690 		val = syscall_arg_fmt__mask_val(arg, &syscall_arg, val);
2691 
2692 		/*
2693 		 * Suppress this argument if its value is zero and
2694 		 * and we don't have a string associated in an
2695 		 * strarray for it.
2696 		 */
2697 		if (val == 0 &&
2698 		    !trace->show_zeros &&
2699 		    !((arg->show_zero ||
2700 		       arg->scnprintf == SCA_STRARRAY ||
2701 		       arg->scnprintf == SCA_STRARRAYS) &&
2702 		      arg->parm))
2703 			continue;
2704 
2705 		printed += scnprintf(bf + printed, size - printed, "%s", printed ? ", " : "");
2706 
2707 		/*
2708 		 * XXX Perhaps we should have a show_tp_arg_names,
2709 		 * leaving show_arg_names just for syscalls?
2710 		 */
2711 		if (1 || trace->show_arg_names)
2712 			printed += scnprintf(bf + printed, size - printed, "%s: ", field->name);
2713 
2714 		printed += syscall_arg_fmt__scnprintf_val(arg, bf + printed, size - printed, &syscall_arg, val);
2715 	}
2716 
2717 	return printed + fprintf(trace->output, "%s", bf);
2718 }
2719 
2720 static int trace__event_handler(struct trace *trace, struct evsel *evsel,
2721 				union perf_event *event __maybe_unused,
2722 				struct perf_sample *sample)
2723 {
2724 	struct thread *thread;
2725 	int callchain_ret = 0;
2726 	/*
2727 	 * Check if we called perf_evsel__disable(evsel) due to, for instance,
2728 	 * this event's max_events having been hit and this is an entry coming
2729 	 * from the ring buffer that we should discard, since the max events
2730 	 * have already been considered/printed.
2731 	 */
2732 	if (evsel->disabled)
2733 		return 0;
2734 
2735 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2736 
2737 	if (sample->callchain) {
2738 		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2739 		if (callchain_ret == 0) {
2740 			if (callchain_cursor.nr < trace->min_stack)
2741 				goto out;
2742 			callchain_ret = 1;
2743 		}
2744 	}
2745 
2746 	trace__printf_interrupted_entry(trace);
2747 	trace__fprintf_tstamp(trace, sample->time, trace->output);
2748 
2749 	if (trace->trace_syscalls && trace->show_duration)
2750 		fprintf(trace->output, "(         ): ");
2751 
2752 	if (thread)
2753 		trace__fprintf_comm_tid(trace, thread, trace->output);
2754 
2755 	if (evsel == trace->syscalls.events.augmented) {
2756 		int id = perf_evsel__sc_tp_uint(evsel, id, sample);
2757 		struct syscall *sc = trace__syscall_info(trace, evsel, id);
2758 
2759 		if (sc) {
2760 			fprintf(trace->output, "%s(", sc->name);
2761 			trace__fprintf_sys_enter(trace, evsel, sample);
2762 			fputc(')', trace->output);
2763 			goto newline;
2764 		}
2765 
2766 		/*
2767 		 * XXX: Not having the associated syscall info or not finding/adding
2768 		 * 	the thread should never happen, but if it does...
2769 		 * 	fall thru and print it as a bpf_output event.
2770 		 */
2771 	}
2772 
2773 	fprintf(trace->output, "%s(", evsel->name);
2774 
2775 	if (perf_evsel__is_bpf_output(evsel)) {
2776 		bpf_output__fprintf(trace, sample);
2777 	} else if (evsel->tp_format) {
2778 		if (strncmp(evsel->tp_format->name, "sys_enter_", 10) ||
2779 		    trace__fprintf_sys_enter(trace, evsel, sample)) {
2780 			if (trace->libtraceevent_print) {
2781 				event_format__fprintf(evsel->tp_format, sample->cpu,
2782 						      sample->raw_data, sample->raw_size,
2783 						      trace->output);
2784 			} else {
2785 				trace__fprintf_tp_fields(trace, evsel, sample, thread, NULL, 0);
2786 			}
2787 		}
2788 	}
2789 
2790 newline:
2791 	fprintf(trace->output, ")\n");
2792 
2793 	if (callchain_ret > 0)
2794 		trace__fprintf_callchain(trace, sample);
2795 	else if (callchain_ret < 0)
2796 		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
2797 
2798 	++trace->nr_events_printed;
2799 
2800 	if (evsel->max_events != ULONG_MAX && ++evsel->nr_events_printed == evsel->max_events) {
2801 		evsel__disable(evsel);
2802 		evsel__close(evsel);
2803 	}
2804 out:
2805 	thread__put(thread);
2806 	return 0;
2807 }
2808 
2809 static void print_location(FILE *f, struct perf_sample *sample,
2810 			   struct addr_location *al,
2811 			   bool print_dso, bool print_sym)
2812 {
2813 
2814 	if ((verbose > 0 || print_dso) && al->map)
2815 		fprintf(f, "%s@", al->map->dso->long_name);
2816 
2817 	if ((verbose > 0 || print_sym) && al->sym)
2818 		fprintf(f, "%s+0x%" PRIx64, al->sym->name,
2819 			al->addr - al->sym->start);
2820 	else if (al->map)
2821 		fprintf(f, "0x%" PRIx64, al->addr);
2822 	else
2823 		fprintf(f, "0x%" PRIx64, sample->addr);
2824 }
2825 
2826 static int trace__pgfault(struct trace *trace,
2827 			  struct evsel *evsel,
2828 			  union perf_event *event __maybe_unused,
2829 			  struct perf_sample *sample)
2830 {
2831 	struct thread *thread;
2832 	struct addr_location al;
2833 	char map_type = 'd';
2834 	struct thread_trace *ttrace;
2835 	int err = -1;
2836 	int callchain_ret = 0;
2837 
2838 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2839 
2840 	if (sample->callchain) {
2841 		callchain_ret = trace__resolve_callchain(trace, evsel, sample, &callchain_cursor);
2842 		if (callchain_ret == 0) {
2843 			if (callchain_cursor.nr < trace->min_stack)
2844 				goto out_put;
2845 			callchain_ret = 1;
2846 		}
2847 	}
2848 
2849 	ttrace = thread__trace(thread, trace->output);
2850 	if (ttrace == NULL)
2851 		goto out_put;
2852 
2853 	if (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ)
2854 		ttrace->pfmaj++;
2855 	else
2856 		ttrace->pfmin++;
2857 
2858 	if (trace->summary_only)
2859 		goto out;
2860 
2861 	thread__find_symbol(thread, sample->cpumode, sample->ip, &al);
2862 
2863 	trace__fprintf_entry_head(trace, thread, 0, true, sample->time, trace->output);
2864 
2865 	fprintf(trace->output, "%sfault [",
2866 		evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ?
2867 		"maj" : "min");
2868 
2869 	print_location(trace->output, sample, &al, false, true);
2870 
2871 	fprintf(trace->output, "] => ");
2872 
2873 	thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
2874 
2875 	if (!al.map) {
2876 		thread__find_symbol(thread, sample->cpumode, sample->addr, &al);
2877 
2878 		if (al.map)
2879 			map_type = 'x';
2880 		else
2881 			map_type = '?';
2882 	}
2883 
2884 	print_location(trace->output, sample, &al, true, false);
2885 
2886 	fprintf(trace->output, " (%c%c)\n", map_type, al.level);
2887 
2888 	if (callchain_ret > 0)
2889 		trace__fprintf_callchain(trace, sample);
2890 	else if (callchain_ret < 0)
2891 		pr_err("Problem processing %s callchain, skipping...\n", perf_evsel__name(evsel));
2892 
2893 	++trace->nr_events_printed;
2894 out:
2895 	err = 0;
2896 out_put:
2897 	thread__put(thread);
2898 	return err;
2899 }
2900 
2901 static void trace__set_base_time(struct trace *trace,
2902 				 struct evsel *evsel,
2903 				 struct perf_sample *sample)
2904 {
2905 	/*
2906 	 * BPF events were not setting PERF_SAMPLE_TIME, so be more robust
2907 	 * and don't use sample->time unconditionally, we may end up having
2908 	 * some other event in the future without PERF_SAMPLE_TIME for good
2909 	 * reason, i.e. we may not be interested in its timestamps, just in
2910 	 * it taking place, picking some piece of information when it
2911 	 * appears in our event stream (vfs_getname comes to mind).
2912 	 */
2913 	if (trace->base_time == 0 && !trace->full_time &&
2914 	    (evsel->core.attr.sample_type & PERF_SAMPLE_TIME))
2915 		trace->base_time = sample->time;
2916 }
2917 
2918 static int trace__process_sample(struct perf_tool *tool,
2919 				 union perf_event *event,
2920 				 struct perf_sample *sample,
2921 				 struct evsel *evsel,
2922 				 struct machine *machine __maybe_unused)
2923 {
2924 	struct trace *trace = container_of(tool, struct trace, tool);
2925 	struct thread *thread;
2926 	int err = 0;
2927 
2928 	tracepoint_handler handler = evsel->handler;
2929 
2930 	thread = machine__findnew_thread(trace->host, sample->pid, sample->tid);
2931 	if (thread && thread__is_filtered(thread))
2932 		goto out;
2933 
2934 	trace__set_base_time(trace, evsel, sample);
2935 
2936 	if (handler) {
2937 		++trace->nr_events;
2938 		handler(trace, evsel, event, sample);
2939 	}
2940 out:
2941 	thread__put(thread);
2942 	return err;
2943 }
2944 
2945 static int trace__record(struct trace *trace, int argc, const char **argv)
2946 {
2947 	unsigned int rec_argc, i, j;
2948 	const char **rec_argv;
2949 	const char * const record_args[] = {
2950 		"record",
2951 		"-R",
2952 		"-m", "1024",
2953 		"-c", "1",
2954 	};
2955 	pid_t pid = getpid();
2956 	char *filter = asprintf__tp_filter_pids(1, &pid);
2957 	const char * const sc_args[] = { "-e", };
2958 	unsigned int sc_args_nr = ARRAY_SIZE(sc_args);
2959 	const char * const majpf_args[] = { "-e", "major-faults" };
2960 	unsigned int majpf_args_nr = ARRAY_SIZE(majpf_args);
2961 	const char * const minpf_args[] = { "-e", "minor-faults" };
2962 	unsigned int minpf_args_nr = ARRAY_SIZE(minpf_args);
2963 	int err = -1;
2964 
2965 	/* +3 is for the event string below and the pid filter */
2966 	rec_argc = ARRAY_SIZE(record_args) + sc_args_nr + 3 +
2967 		majpf_args_nr + minpf_args_nr + argc;
2968 	rec_argv = calloc(rec_argc + 1, sizeof(char *));
2969 
2970 	if (rec_argv == NULL || filter == NULL)
2971 		goto out_free;
2972 
2973 	j = 0;
2974 	for (i = 0; i < ARRAY_SIZE(record_args); i++)
2975 		rec_argv[j++] = record_args[i];
2976 
2977 	if (trace->trace_syscalls) {
2978 		for (i = 0; i < sc_args_nr; i++)
2979 			rec_argv[j++] = sc_args[i];
2980 
2981 		/* event string may be different for older kernels - e.g., RHEL6 */
2982 		if (is_valid_tracepoint("raw_syscalls:sys_enter"))
2983 			rec_argv[j++] = "raw_syscalls:sys_enter,raw_syscalls:sys_exit";
2984 		else if (is_valid_tracepoint("syscalls:sys_enter"))
2985 			rec_argv[j++] = "syscalls:sys_enter,syscalls:sys_exit";
2986 		else {
2987 			pr_err("Neither raw_syscalls nor syscalls events exist.\n");
2988 			goto out_free;
2989 		}
2990 	}
2991 
2992 	rec_argv[j++] = "--filter";
2993 	rec_argv[j++] = filter;
2994 
2995 	if (trace->trace_pgfaults & TRACE_PFMAJ)
2996 		for (i = 0; i < majpf_args_nr; i++)
2997 			rec_argv[j++] = majpf_args[i];
2998 
2999 	if (trace->trace_pgfaults & TRACE_PFMIN)
3000 		for (i = 0; i < minpf_args_nr; i++)
3001 			rec_argv[j++] = minpf_args[i];
3002 
3003 	for (i = 0; i < (unsigned int)argc; i++)
3004 		rec_argv[j++] = argv[i];
3005 
3006 	err = cmd_record(j, rec_argv);
3007 out_free:
3008 	free(filter);
3009 	free(rec_argv);
3010 	return err;
3011 }
3012 
3013 static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
3014 
3015 static bool evlist__add_vfs_getname(struct evlist *evlist)
3016 {
3017 	bool found = false;
3018 	struct evsel *evsel, *tmp;
3019 	struct parse_events_error err;
3020 	int ret;
3021 
3022 	bzero(&err, sizeof(err));
3023 	ret = parse_events(evlist, "probe:vfs_getname*", &err);
3024 	if (ret) {
3025 		free(err.str);
3026 		free(err.help);
3027 		free(err.first_str);
3028 		free(err.first_help);
3029 		return false;
3030 	}
3031 
3032 	evlist__for_each_entry_safe(evlist, evsel, tmp) {
3033 		if (!strstarts(perf_evsel__name(evsel), "probe:vfs_getname"))
3034 			continue;
3035 
3036 		if (perf_evsel__field(evsel, "pathname")) {
3037 			evsel->handler = trace__vfs_getname;
3038 			found = true;
3039 			continue;
3040 		}
3041 
3042 		list_del_init(&evsel->core.node);
3043 		evsel->evlist = NULL;
3044 		evsel__delete(evsel);
3045 	}
3046 
3047 	return found;
3048 }
3049 
3050 static struct evsel *perf_evsel__new_pgfault(u64 config)
3051 {
3052 	struct evsel *evsel;
3053 	struct perf_event_attr attr = {
3054 		.type = PERF_TYPE_SOFTWARE,
3055 		.mmap_data = 1,
3056 	};
3057 
3058 	attr.config = config;
3059 	attr.sample_period = 1;
3060 
3061 	event_attr_init(&attr);
3062 
3063 	evsel = evsel__new(&attr);
3064 	if (evsel)
3065 		evsel->handler = trace__pgfault;
3066 
3067 	return evsel;
3068 }
3069 
3070 static void trace__handle_event(struct trace *trace, union perf_event *event, struct perf_sample *sample)
3071 {
3072 	const u32 type = event->header.type;
3073 	struct evsel *evsel;
3074 
3075 	if (type != PERF_RECORD_SAMPLE) {
3076 		trace__process_event(trace, trace->host, event, sample);
3077 		return;
3078 	}
3079 
3080 	evsel = perf_evlist__id2evsel(trace->evlist, sample->id);
3081 	if (evsel == NULL) {
3082 		fprintf(trace->output, "Unknown tp ID %" PRIu64 ", skipping...\n", sample->id);
3083 		return;
3084 	}
3085 
3086 	if (evswitch__discard(&trace->evswitch, evsel))
3087 		return;
3088 
3089 	trace__set_base_time(trace, evsel, sample);
3090 
3091 	if (evsel->core.attr.type == PERF_TYPE_TRACEPOINT &&
3092 	    sample->raw_data == NULL) {
3093 		fprintf(trace->output, "%s sample with no payload for tid: %d, cpu %d, raw_size=%d, skipping...\n",
3094 		       perf_evsel__name(evsel), sample->tid,
3095 		       sample->cpu, sample->raw_size);
3096 	} else {
3097 		tracepoint_handler handler = evsel->handler;
3098 		handler(trace, evsel, event, sample);
3099 	}
3100 
3101 	if (trace->nr_events_printed >= trace->max_events && trace->max_events != ULONG_MAX)
3102 		interrupted = true;
3103 }
3104 
3105 static int trace__add_syscall_newtp(struct trace *trace)
3106 {
3107 	int ret = -1;
3108 	struct evlist *evlist = trace->evlist;
3109 	struct evsel *sys_enter, *sys_exit;
3110 
3111 	sys_enter = perf_evsel__raw_syscall_newtp("sys_enter", trace__sys_enter);
3112 	if (sys_enter == NULL)
3113 		goto out;
3114 
3115 	if (perf_evsel__init_sc_tp_ptr_field(sys_enter, args))
3116 		goto out_delete_sys_enter;
3117 
3118 	sys_exit = perf_evsel__raw_syscall_newtp("sys_exit", trace__sys_exit);
3119 	if (sys_exit == NULL)
3120 		goto out_delete_sys_enter;
3121 
3122 	if (perf_evsel__init_sc_tp_uint_field(sys_exit, ret))
3123 		goto out_delete_sys_exit;
3124 
3125 	perf_evsel__config_callchain(sys_enter, &trace->opts, &callchain_param);
3126 	perf_evsel__config_callchain(sys_exit, &trace->opts, &callchain_param);
3127 
3128 	evlist__add(evlist, sys_enter);
3129 	evlist__add(evlist, sys_exit);
3130 
3131 	if (callchain_param.enabled && !trace->kernel_syscallchains) {
3132 		/*
3133 		 * We're interested only in the user space callchain
3134 		 * leading to the syscall, allow overriding that for
3135 		 * debugging reasons using --kernel_syscall_callchains
3136 		 */
3137 		sys_exit->core.attr.exclude_callchain_kernel = 1;
3138 	}
3139 
3140 	trace->syscalls.events.sys_enter = sys_enter;
3141 	trace->syscalls.events.sys_exit  = sys_exit;
3142 
3143 	ret = 0;
3144 out:
3145 	return ret;
3146 
3147 out_delete_sys_exit:
3148 	evsel__delete_priv(sys_exit);
3149 out_delete_sys_enter:
3150 	evsel__delete_priv(sys_enter);
3151 	goto out;
3152 }
3153 
3154 static int trace__set_ev_qualifier_tp_filter(struct trace *trace)
3155 {
3156 	int err = -1;
3157 	struct evsel *sys_exit;
3158 	char *filter = asprintf_expr_inout_ints("id", !trace->not_ev_qualifier,
3159 						trace->ev_qualifier_ids.nr,
3160 						trace->ev_qualifier_ids.entries);
3161 
3162 	if (filter == NULL)
3163 		goto out_enomem;
3164 
3165 	if (!perf_evsel__append_tp_filter(trace->syscalls.events.sys_enter,
3166 					  filter)) {
3167 		sys_exit = trace->syscalls.events.sys_exit;
3168 		err = perf_evsel__append_tp_filter(sys_exit, filter);
3169 	}
3170 
3171 	free(filter);
3172 out:
3173 	return err;
3174 out_enomem:
3175 	errno = ENOMEM;
3176 	goto out;
3177 }
3178 
3179 #ifdef HAVE_LIBBPF_SUPPORT
3180 static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace, const char *name)
3181 {
3182 	if (trace->bpf_obj == NULL)
3183 		return NULL;
3184 
3185 	return bpf_object__find_program_by_title(trace->bpf_obj, name);
3186 }
3187 
3188 static struct bpf_program *trace__find_syscall_bpf_prog(struct trace *trace, struct syscall *sc,
3189 							const char *prog_name, const char *type)
3190 {
3191 	struct bpf_program *prog;
3192 
3193 	if (prog_name == NULL) {
3194 		char default_prog_name[256];
3195 		scnprintf(default_prog_name, sizeof(default_prog_name), "!syscalls:sys_%s_%s", type, sc->name);
3196 		prog = trace__find_bpf_program_by_title(trace, default_prog_name);
3197 		if (prog != NULL)
3198 			goto out_found;
3199 		if (sc->fmt && sc->fmt->alias) {
3200 			scnprintf(default_prog_name, sizeof(default_prog_name), "!syscalls:sys_%s_%s", type, sc->fmt->alias);
3201 			prog = trace__find_bpf_program_by_title(trace, default_prog_name);
3202 			if (prog != NULL)
3203 				goto out_found;
3204 		}
3205 		goto out_unaugmented;
3206 	}
3207 
3208 	prog = trace__find_bpf_program_by_title(trace, prog_name);
3209 
3210 	if (prog != NULL) {
3211 out_found:
3212 		return prog;
3213 	}
3214 
3215 	pr_debug("Couldn't find BPF prog \"%s\" to associate with syscalls:sys_%s_%s, not augmenting it\n",
3216 		 prog_name, type, sc->name);
3217 out_unaugmented:
3218 	return trace->syscalls.unaugmented_prog;
3219 }
3220 
3221 static void trace__init_syscall_bpf_progs(struct trace *trace, int id)
3222 {
3223 	struct syscall *sc = trace__syscall_info(trace, NULL, id);
3224 
3225 	if (sc == NULL)
3226 		return;
3227 
3228 	sc->bpf_prog.sys_enter = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_enter : NULL, "enter");
3229 	sc->bpf_prog.sys_exit  = trace__find_syscall_bpf_prog(trace, sc, sc->fmt ? sc->fmt->bpf_prog_name.sys_exit  : NULL,  "exit");
3230 }
3231 
3232 static int trace__bpf_prog_sys_enter_fd(struct trace *trace, int id)
3233 {
3234 	struct syscall *sc = trace__syscall_info(trace, NULL, id);
3235 	return sc ? bpf_program__fd(sc->bpf_prog.sys_enter) : bpf_program__fd(trace->syscalls.unaugmented_prog);
3236 }
3237 
3238 static int trace__bpf_prog_sys_exit_fd(struct trace *trace, int id)
3239 {
3240 	struct syscall *sc = trace__syscall_info(trace, NULL, id);
3241 	return sc ? bpf_program__fd(sc->bpf_prog.sys_exit) : bpf_program__fd(trace->syscalls.unaugmented_prog);
3242 }
3243 
3244 static void trace__init_bpf_map_syscall_args(struct trace *trace, int id, struct bpf_map_syscall_entry *entry)
3245 {
3246 	struct syscall *sc = trace__syscall_info(trace, NULL, id);
3247 	int arg = 0;
3248 
3249 	if (sc == NULL)
3250 		goto out;
3251 
3252 	for (; arg < sc->nr_args; ++arg) {
3253 		entry->string_args_len[arg] = 0;
3254 		if (sc->arg_fmt[arg].scnprintf == SCA_FILENAME) {
3255 			/* Should be set like strace -s strsize */
3256 			entry->string_args_len[arg] = PATH_MAX;
3257 		}
3258 	}
3259 out:
3260 	for (; arg < 6; ++arg)
3261 		entry->string_args_len[arg] = 0;
3262 }
3263 static int trace__set_ev_qualifier_bpf_filter(struct trace *trace)
3264 {
3265 	int fd = bpf_map__fd(trace->syscalls.map);
3266 	struct bpf_map_syscall_entry value = {
3267 		.enabled = !trace->not_ev_qualifier,
3268 	};
3269 	int err = 0;
3270 	size_t i;
3271 
3272 	for (i = 0; i < trace->ev_qualifier_ids.nr; ++i) {
3273 		int key = trace->ev_qualifier_ids.entries[i];
3274 
3275 		if (value.enabled) {
3276 			trace__init_bpf_map_syscall_args(trace, key, &value);
3277 			trace__init_syscall_bpf_progs(trace, key);
3278 		}
3279 
3280 		err = bpf_map_update_elem(fd, &key, &value, BPF_EXIST);
3281 		if (err)
3282 			break;
3283 	}
3284 
3285 	return err;
3286 }
3287 
3288 static int __trace__init_syscalls_bpf_map(struct trace *trace, bool enabled)
3289 {
3290 	int fd = bpf_map__fd(trace->syscalls.map);
3291 	struct bpf_map_syscall_entry value = {
3292 		.enabled = enabled,
3293 	};
3294 	int err = 0, key;
3295 
3296 	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
3297 		if (enabled)
3298 			trace__init_bpf_map_syscall_args(trace, key, &value);
3299 
3300 		err = bpf_map_update_elem(fd, &key, &value, BPF_ANY);
3301 		if (err)
3302 			break;
3303 	}
3304 
3305 	return err;
3306 }
3307 
3308 static int trace__init_syscalls_bpf_map(struct trace *trace)
3309 {
3310 	bool enabled = true;
3311 
3312 	if (trace->ev_qualifier_ids.nr)
3313 		enabled = trace->not_ev_qualifier;
3314 
3315 	return __trace__init_syscalls_bpf_map(trace, enabled);
3316 }
3317 
3318 static struct bpf_program *trace__find_usable_bpf_prog_entry(struct trace *trace, struct syscall *sc)
3319 {
3320 	struct tep_format_field *field, *candidate_field;
3321 	int id;
3322 
3323 	/*
3324 	 * We're only interested in syscalls that have a pointer:
3325 	 */
3326 	for (field = sc->args; field; field = field->next) {
3327 		if (field->flags & TEP_FIELD_IS_POINTER)
3328 			goto try_to_find_pair;
3329 	}
3330 
3331 	return NULL;
3332 
3333 try_to_find_pair:
3334 	for (id = 0; id < trace->sctbl->syscalls.nr_entries; ++id) {
3335 		struct syscall *pair = trace__syscall_info(trace, NULL, id);
3336 		struct bpf_program *pair_prog;
3337 		bool is_candidate = false;
3338 
3339 		if (pair == NULL || pair == sc ||
3340 		    pair->bpf_prog.sys_enter == trace->syscalls.unaugmented_prog)
3341 			continue;
3342 
3343 		for (field = sc->args, candidate_field = pair->args;
3344 		     field && candidate_field; field = field->next, candidate_field = candidate_field->next) {
3345 			bool is_pointer = field->flags & TEP_FIELD_IS_POINTER,
3346 			     candidate_is_pointer = candidate_field->flags & TEP_FIELD_IS_POINTER;
3347 
3348 			if (is_pointer) {
3349 			       if (!candidate_is_pointer) {
3350 					// The candidate just doesn't copies our pointer arg, might copy other pointers we want.
3351 					continue;
3352 			       }
3353 			} else {
3354 				if (candidate_is_pointer) {
3355 					// The candidate might copy a pointer we don't have, skip it.
3356 					goto next_candidate;
3357 				}
3358 				continue;
3359 			}
3360 
3361 			if (strcmp(field->type, candidate_field->type))
3362 				goto next_candidate;
3363 
3364 			is_candidate = true;
3365 		}
3366 
3367 		if (!is_candidate)
3368 			goto next_candidate;
3369 
3370 		/*
3371 		 * Check if the tentative pair syscall augmenter has more pointers, if it has,
3372 		 * then it may be collecting that and we then can't use it, as it would collect
3373 		 * more than what is common to the two syscalls.
3374 		 */
3375 		if (candidate_field) {
3376 			for (candidate_field = candidate_field->next; candidate_field; candidate_field = candidate_field->next)
3377 				if (candidate_field->flags & TEP_FIELD_IS_POINTER)
3378 					goto next_candidate;
3379 		}
3380 
3381 		pair_prog = pair->bpf_prog.sys_enter;
3382 		/*
3383 		 * If the pair isn't enabled, then its bpf_prog.sys_enter will not
3384 		 * have been searched for, so search it here and if it returns the
3385 		 * unaugmented one, then ignore it, otherwise we'll reuse that BPF
3386 		 * program for a filtered syscall on a non-filtered one.
3387 		 *
3388 		 * For instance, we have "!syscalls:sys_enter_renameat" and that is
3389 		 * useful for "renameat2".
3390 		 */
3391 		if (pair_prog == NULL) {
3392 			pair_prog = trace__find_syscall_bpf_prog(trace, pair, pair->fmt ? pair->fmt->bpf_prog_name.sys_enter : NULL, "enter");
3393 			if (pair_prog == trace->syscalls.unaugmented_prog)
3394 				goto next_candidate;
3395 		}
3396 
3397 		pr_debug("Reusing \"%s\" BPF sys_enter augmenter for \"%s\"\n", pair->name, sc->name);
3398 		return pair_prog;
3399 	next_candidate:
3400 		continue;
3401 	}
3402 
3403 	return NULL;
3404 }
3405 
3406 static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace)
3407 {
3408 	int map_enter_fd = bpf_map__fd(trace->syscalls.prog_array.sys_enter),
3409 	    map_exit_fd  = bpf_map__fd(trace->syscalls.prog_array.sys_exit);
3410 	int err = 0, key;
3411 
3412 	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
3413 		int prog_fd;
3414 
3415 		if (!trace__syscall_enabled(trace, key))
3416 			continue;
3417 
3418 		trace__init_syscall_bpf_progs(trace, key);
3419 
3420 		// It'll get at least the "!raw_syscalls:unaugmented"
3421 		prog_fd = trace__bpf_prog_sys_enter_fd(trace, key);
3422 		err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
3423 		if (err)
3424 			break;
3425 		prog_fd = trace__bpf_prog_sys_exit_fd(trace, key);
3426 		err = bpf_map_update_elem(map_exit_fd, &key, &prog_fd, BPF_ANY);
3427 		if (err)
3428 			break;
3429 	}
3430 
3431 	/*
3432 	 * Now lets do a second pass looking for enabled syscalls without
3433 	 * an augmenter that have a signature that is a superset of another
3434 	 * syscall with an augmenter so that we can auto-reuse it.
3435 	 *
3436 	 * I.e. if we have an augmenter for the "open" syscall that has
3437 	 * this signature:
3438 	 *
3439 	 *   int open(const char *pathname, int flags, mode_t mode);
3440 	 *
3441 	 * I.e. that will collect just the first string argument, then we
3442 	 * can reuse it for the 'creat' syscall, that has this signature:
3443 	 *
3444 	 *   int creat(const char *pathname, mode_t mode);
3445 	 *
3446 	 * and for:
3447 	 *
3448 	 *   int stat(const char *pathname, struct stat *statbuf);
3449 	 *   int lstat(const char *pathname, struct stat *statbuf);
3450 	 *
3451 	 * Because the 'open' augmenter will collect the first arg as a string,
3452 	 * and leave alone all the other args, which already helps with
3453 	 * beautifying 'stat' and 'lstat''s pathname arg.
3454 	 *
3455 	 * Then, in time, when 'stat' gets an augmenter that collects both
3456 	 * first and second arg (this one on the raw_syscalls:sys_exit prog
3457 	 * array tail call, then that one will be used.
3458 	 */
3459 	for (key = 0; key < trace->sctbl->syscalls.nr_entries; ++key) {
3460 		struct syscall *sc = trace__syscall_info(trace, NULL, key);
3461 		struct bpf_program *pair_prog;
3462 		int prog_fd;
3463 
3464 		if (sc == NULL || sc->bpf_prog.sys_enter == NULL)
3465 			continue;
3466 
3467 		/*
3468 		 * For now we're just reusing the sys_enter prog, and if it
3469 		 * already has an augmenter, we don't need to find one.
3470 		 */
3471 		if (sc->bpf_prog.sys_enter != trace->syscalls.unaugmented_prog)
3472 			continue;
3473 
3474 		/*
3475 		 * Look at all the other syscalls for one that has a signature
3476 		 * that is close enough that we can share:
3477 		 */
3478 		pair_prog = trace__find_usable_bpf_prog_entry(trace, sc);
3479 		if (pair_prog == NULL)
3480 			continue;
3481 
3482 		sc->bpf_prog.sys_enter = pair_prog;
3483 
3484 		/*
3485 		 * Update the BPF_MAP_TYPE_PROG_SHARED for raw_syscalls:sys_enter
3486 		 * with the fd for the program we're reusing:
3487 		 */
3488 		prog_fd = bpf_program__fd(sc->bpf_prog.sys_enter);
3489 		err = bpf_map_update_elem(map_enter_fd, &key, &prog_fd, BPF_ANY);
3490 		if (err)
3491 			break;
3492 	}
3493 
3494 
3495 	return err;
3496 }
3497 
3498 static void trace__delete_augmented_syscalls(struct trace *trace)
3499 {
3500 	struct evsel *evsel, *tmp;
3501 
3502 	evlist__remove(trace->evlist, trace->syscalls.events.augmented);
3503 	evsel__delete(trace->syscalls.events.augmented);
3504 	trace->syscalls.events.augmented = NULL;
3505 
3506 	evlist__for_each_entry_safe(trace->evlist, tmp, evsel) {
3507 		if (evsel->bpf_obj == trace->bpf_obj) {
3508 			evlist__remove(trace->evlist, evsel);
3509 			evsel__delete(evsel);
3510 		}
3511 
3512 	}
3513 
3514 	bpf_object__close(trace->bpf_obj);
3515 	trace->bpf_obj = NULL;
3516 }
3517 #else // HAVE_LIBBPF_SUPPORT
3518 static int trace__set_ev_qualifier_bpf_filter(struct trace *trace __maybe_unused)
3519 {
3520 	return 0;
3521 }
3522 
3523 static int trace__init_syscalls_bpf_map(struct trace *trace __maybe_unused)
3524 {
3525 	return 0;
3526 }
3527 
3528 static struct bpf_program *trace__find_bpf_program_by_title(struct trace *trace __maybe_unused,
3529 							    const char *name __maybe_unused)
3530 {
3531 	return NULL;
3532 }
3533 
3534 static int trace__init_syscalls_bpf_prog_array_maps(struct trace *trace __maybe_unused)
3535 {
3536 	return 0;
3537 }
3538 
3539 static void trace__delete_augmented_syscalls(struct trace *trace __maybe_unused)
3540 {
3541 }
3542 #endif // HAVE_LIBBPF_SUPPORT
3543 
3544 static bool trace__only_augmented_syscalls_evsels(struct trace *trace)
3545 {
3546 	struct evsel *evsel;
3547 
3548 	evlist__for_each_entry(trace->evlist, evsel) {
3549 		if (evsel == trace->syscalls.events.augmented ||
3550 		    evsel->bpf_obj == trace->bpf_obj)
3551 			continue;
3552 
3553 		return false;
3554 	}
3555 
3556 	return true;
3557 }
3558 
3559 static int trace__set_ev_qualifier_filter(struct trace *trace)
3560 {
3561 	if (trace->syscalls.map)
3562 		return trace__set_ev_qualifier_bpf_filter(trace);
3563 	if (trace->syscalls.events.sys_enter)
3564 		return trace__set_ev_qualifier_tp_filter(trace);
3565 	return 0;
3566 }
3567 
3568 static int bpf_map__set_filter_pids(struct bpf_map *map __maybe_unused,
3569 				    size_t npids __maybe_unused, pid_t *pids __maybe_unused)
3570 {
3571 	int err = 0;
3572 #ifdef HAVE_LIBBPF_SUPPORT
3573 	bool value = true;
3574 	int map_fd = bpf_map__fd(map);
3575 	size_t i;
3576 
3577 	for (i = 0; i < npids; ++i) {
3578 		err = bpf_map_update_elem(map_fd, &pids[i], &value, BPF_ANY);
3579 		if (err)
3580 			break;
3581 	}
3582 #endif
3583 	return err;
3584 }
3585 
3586 static int trace__set_filter_loop_pids(struct trace *trace)
3587 {
3588 	unsigned int nr = 1, err;
3589 	pid_t pids[32] = {
3590 		getpid(),
3591 	};
3592 	struct thread *thread = machine__find_thread(trace->host, pids[0], pids[0]);
3593 
3594 	while (thread && nr < ARRAY_SIZE(pids)) {
3595 		struct thread *parent = machine__find_thread(trace->host, thread->ppid, thread->ppid);
3596 
3597 		if (parent == NULL)
3598 			break;
3599 
3600 		if (!strcmp(thread__comm_str(parent), "sshd") ||
3601 		    strstarts(thread__comm_str(parent), "gnome-terminal")) {
3602 			pids[nr++] = parent->tid;
3603 			break;
3604 		}
3605 		thread = parent;
3606 	}
3607 
3608 	err = perf_evlist__append_tp_filter_pids(trace->evlist, nr, pids);
3609 	if (!err && trace->filter_pids.map)
3610 		err = bpf_map__set_filter_pids(trace->filter_pids.map, nr, pids);
3611 
3612 	return err;
3613 }
3614 
3615 static int trace__set_filter_pids(struct trace *trace)
3616 {
3617 	int err = 0;
3618 	/*
3619 	 * Better not use !target__has_task() here because we need to cover the
3620 	 * case where no threads were specified in the command line, but a
3621 	 * workload was, and in that case we will fill in the thread_map when
3622 	 * we fork the workload in perf_evlist__prepare_workload.
3623 	 */
3624 	if (trace->filter_pids.nr > 0) {
3625 		err = perf_evlist__append_tp_filter_pids(trace->evlist, trace->filter_pids.nr,
3626 							 trace->filter_pids.entries);
3627 		if (!err && trace->filter_pids.map) {
3628 			err = bpf_map__set_filter_pids(trace->filter_pids.map, trace->filter_pids.nr,
3629 						       trace->filter_pids.entries);
3630 		}
3631 	} else if (perf_thread_map__pid(trace->evlist->core.threads, 0) == -1) {
3632 		err = trace__set_filter_loop_pids(trace);
3633 	}
3634 
3635 	return err;
3636 }
3637 
3638 static int __trace__deliver_event(struct trace *trace, union perf_event *event)
3639 {
3640 	struct evlist *evlist = trace->evlist;
3641 	struct perf_sample sample;
3642 	int err;
3643 
3644 	err = perf_evlist__parse_sample(evlist, event, &sample);
3645 	if (err)
3646 		fprintf(trace->output, "Can't parse sample, err = %d, skipping...\n", err);
3647 	else
3648 		trace__handle_event(trace, event, &sample);
3649 
3650 	return 0;
3651 }
3652 
3653 static int __trace__flush_events(struct trace *trace)
3654 {
3655 	u64 first = ordered_events__first_time(&trace->oe.data);
3656 	u64 flush = trace->oe.last - NSEC_PER_SEC;
3657 
3658 	/* Is there some thing to flush.. */
3659 	if (first && first < flush)
3660 		return ordered_events__flush_time(&trace->oe.data, flush);
3661 
3662 	return 0;
3663 }
3664 
3665 static int trace__flush_events(struct trace *trace)
3666 {
3667 	return !trace->sort_events ? 0 : __trace__flush_events(trace);
3668 }
3669 
3670 static int trace__deliver_event(struct trace *trace, union perf_event *event)
3671 {
3672 	int err;
3673 
3674 	if (!trace->sort_events)
3675 		return __trace__deliver_event(trace, event);
3676 
3677 	err = perf_evlist__parse_sample_timestamp(trace->evlist, event, &trace->oe.last);
3678 	if (err && err != -1)
3679 		return err;
3680 
3681 	err = ordered_events__queue(&trace->oe.data, event, trace->oe.last, 0);
3682 	if (err)
3683 		return err;
3684 
3685 	return trace__flush_events(trace);
3686 }
3687 
3688 static int ordered_events__deliver_event(struct ordered_events *oe,
3689 					 struct ordered_event *event)
3690 {
3691 	struct trace *trace = container_of(oe, struct trace, oe.data);
3692 
3693 	return __trace__deliver_event(trace, event->event);
3694 }
3695 
3696 static struct syscall_arg_fmt *perf_evsel__syscall_arg_fmt(struct evsel *evsel, char *arg)
3697 {
3698 	struct tep_format_field *field;
3699 	struct syscall_arg_fmt *fmt = __evsel__syscall_arg_fmt(evsel);
3700 
3701 	if (evsel->tp_format == NULL || fmt == NULL)
3702 		return NULL;
3703 
3704 	for (field = evsel->tp_format->format.fields; field; field = field->next, ++fmt)
3705 		if (strcmp(field->name, arg) == 0)
3706 			return fmt;
3707 
3708 	return NULL;
3709 }
3710 
3711 static int trace__expand_filter(struct trace *trace __maybe_unused, struct evsel *evsel)
3712 {
3713 	char *tok, *left = evsel->filter, *new_filter = evsel->filter;
3714 
3715 	while ((tok = strpbrk(left, "=<>!")) != NULL) {
3716 		char *right = tok + 1, *right_end;
3717 
3718 		if (*right == '=')
3719 			++right;
3720 
3721 		while (isspace(*right))
3722 			++right;
3723 
3724 		if (*right == '\0')
3725 			break;
3726 
3727 		while (!isalpha(*left))
3728 			if (++left == tok) {
3729 				/*
3730 				 * Bail out, can't find the name of the argument that is being
3731 				 * used in the filter, let it try to set this filter, will fail later.
3732 				 */
3733 				return 0;
3734 			}
3735 
3736 		right_end = right + 1;
3737 		while (isalnum(*right_end) || *right_end == '_' || *right_end == '|')
3738 			++right_end;
3739 
3740 		if (isalpha(*right)) {
3741 			struct syscall_arg_fmt *fmt;
3742 			int left_size = tok - left,
3743 			    right_size = right_end - right;
3744 			char arg[128];
3745 
3746 			while (isspace(left[left_size - 1]))
3747 				--left_size;
3748 
3749 			scnprintf(arg, sizeof(arg), "%.*s", left_size, left);
3750 
3751 			fmt = perf_evsel__syscall_arg_fmt(evsel, arg);
3752 			if (fmt == NULL) {
3753 				pr_err("\"%s\" not found in \"%s\", can't set filter \"%s\"\n",
3754 				       arg, evsel->name, evsel->filter);
3755 				return -1;
3756 			}
3757 
3758 			pr_debug2("trying to expand \"%s\" \"%.*s\" \"%.*s\" -> ",
3759 				 arg, (int)(right - tok), tok, right_size, right);
3760 
3761 			if (fmt->strtoul) {
3762 				u64 val;
3763 				struct syscall_arg syscall_arg = {
3764 					.parm = fmt->parm,
3765 				};
3766 
3767 				if (fmt->strtoul(right, right_size, &syscall_arg, &val)) {
3768 					char *n, expansion[19];
3769 					int expansion_lenght = scnprintf(expansion, sizeof(expansion), "%#" PRIx64, val);
3770 					int expansion_offset = right - new_filter;
3771 
3772 					pr_debug("%s", expansion);
3773 
3774 					if (asprintf(&n, "%.*s%s%s", expansion_offset, new_filter, expansion, right_end) < 0) {
3775 						pr_debug(" out of memory!\n");
3776 						free(new_filter);
3777 						return -1;
3778 					}
3779 					if (new_filter != evsel->filter)
3780 						free(new_filter);
3781 					left = n + expansion_offset + expansion_lenght;
3782 					new_filter = n;
3783 				} else {
3784 					pr_err("\"%.*s\" not found for \"%s\" in \"%s\", can't set filter \"%s\"\n",
3785 					       right_size, right, arg, evsel->name, evsel->filter);
3786 					return -1;
3787 				}
3788 			} else {
3789 				pr_err("No resolver (strtoul) for \"%s\" in \"%s\", can't set filter \"%s\"\n",
3790 				       arg, evsel->name, evsel->filter);
3791 				return -1;
3792 			}
3793 
3794 			pr_debug("\n");
3795 		} else {
3796 			left = right_end;
3797 		}
3798 	}
3799 
3800 	if (new_filter != evsel->filter) {
3801 		pr_debug("New filter for %s: %s\n", evsel->name, new_filter);
3802 		perf_evsel__set_filter(evsel, new_filter);
3803 		free(new_filter);
3804 	}
3805 
3806 	return 0;
3807 }
3808 
3809 static int trace__expand_filters(struct trace *trace, struct evsel **err_evsel)
3810 {
3811 	struct evlist *evlist = trace->evlist;
3812 	struct evsel *evsel;
3813 
3814 	evlist__for_each_entry(evlist, evsel) {
3815 		if (evsel->filter == NULL)
3816 			continue;
3817 
3818 		if (trace__expand_filter(trace, evsel)) {
3819 			*err_evsel = evsel;
3820 			return -1;
3821 		}
3822 	}
3823 
3824 	return 0;
3825 }
3826 
3827 static int trace__run(struct trace *trace, int argc, const char **argv)
3828 {
3829 	struct evlist *evlist = trace->evlist;
3830 	struct evsel *evsel, *pgfault_maj = NULL, *pgfault_min = NULL;
3831 	int err = -1, i;
3832 	unsigned long before;
3833 	const bool forks = argc > 0;
3834 	bool draining = false;
3835 
3836 	trace->live = true;
3837 
3838 	if (!trace->raw_augmented_syscalls) {
3839 		if (trace->trace_syscalls && trace__add_syscall_newtp(trace))
3840 			goto out_error_raw_syscalls;
3841 
3842 		if (trace->trace_syscalls)
3843 			trace->vfs_getname = evlist__add_vfs_getname(evlist);
3844 	}
3845 
3846 	if ((trace->trace_pgfaults & TRACE_PFMAJ)) {
3847 		pgfault_maj = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MAJ);
3848 		if (pgfault_maj == NULL)
3849 			goto out_error_mem;
3850 		perf_evsel__config_callchain(pgfault_maj, &trace->opts, &callchain_param);
3851 		evlist__add(evlist, pgfault_maj);
3852 	}
3853 
3854 	if ((trace->trace_pgfaults & TRACE_PFMIN)) {
3855 		pgfault_min = perf_evsel__new_pgfault(PERF_COUNT_SW_PAGE_FAULTS_MIN);
3856 		if (pgfault_min == NULL)
3857 			goto out_error_mem;
3858 		perf_evsel__config_callchain(pgfault_min, &trace->opts, &callchain_param);
3859 		evlist__add(evlist, pgfault_min);
3860 	}
3861 
3862 	if (trace->sched &&
3863 	    perf_evlist__add_newtp(evlist, "sched", "sched_stat_runtime",
3864 				   trace__sched_stat_runtime))
3865 		goto out_error_sched_stat_runtime;
3866 	/*
3867 	 * If a global cgroup was set, apply it to all the events without an
3868 	 * explicit cgroup. I.e.:
3869 	 *
3870 	 * 	trace -G A -e sched:*switch
3871 	 *
3872 	 * Will set all raw_syscalls:sys_{enter,exit}, pgfault, vfs_getname, etc
3873 	 * _and_ sched:sched_switch to the 'A' cgroup, while:
3874 	 *
3875 	 * trace -e sched:*switch -G A
3876 	 *
3877 	 * will only set the sched:sched_switch event to the 'A' cgroup, all the
3878 	 * other events (raw_syscalls:sys_{enter,exit}, etc are left "without"
3879 	 * a cgroup (on the root cgroup, sys wide, etc).
3880 	 *
3881 	 * Multiple cgroups:
3882 	 *
3883 	 * trace -G A -e sched:*switch -G B
3884 	 *
3885 	 * the syscall ones go to the 'A' cgroup, the sched:sched_switch goes
3886 	 * to the 'B' cgroup.
3887 	 *
3888 	 * evlist__set_default_cgroup() grabs a reference of the passed cgroup
3889 	 * only for the evsels still without a cgroup, i.e. evsel->cgroup == NULL.
3890 	 */
3891 	if (trace->cgroup)
3892 		evlist__set_default_cgroup(trace->evlist, trace->cgroup);
3893 
3894 	err = perf_evlist__create_maps(evlist, &trace->opts.target);
3895 	if (err < 0) {
3896 		fprintf(trace->output, "Problems parsing the target to trace, check your options!\n");
3897 		goto out_delete_evlist;
3898 	}
3899 
3900 	err = trace__symbols_init(trace, evlist);
3901 	if (err < 0) {
3902 		fprintf(trace->output, "Problems initializing symbol libraries!\n");
3903 		goto out_delete_evlist;
3904 	}
3905 
3906 	perf_evlist__config(evlist, &trace->opts, &callchain_param);
3907 
3908 	signal(SIGCHLD, sig_handler);
3909 	signal(SIGINT, sig_handler);
3910 
3911 	if (forks) {
3912 		err = perf_evlist__prepare_workload(evlist, &trace->opts.target,
3913 						    argv, false, NULL);
3914 		if (err < 0) {
3915 			fprintf(trace->output, "Couldn't run the workload!\n");
3916 			goto out_delete_evlist;
3917 		}
3918 	}
3919 
3920 	err = evlist__open(evlist);
3921 	if (err < 0)
3922 		goto out_error_open;
3923 
3924 	err = bpf__apply_obj_config();
3925 	if (err) {
3926 		char errbuf[BUFSIZ];
3927 
3928 		bpf__strerror_apply_obj_config(err, errbuf, sizeof(errbuf));
3929 		pr_err("ERROR: Apply config to BPF failed: %s\n",
3930 			 errbuf);
3931 		goto out_error_open;
3932 	}
3933 
3934 	err = trace__set_filter_pids(trace);
3935 	if (err < 0)
3936 		goto out_error_mem;
3937 
3938 	if (trace->syscalls.map)
3939 		trace__init_syscalls_bpf_map(trace);
3940 
3941 	if (trace->syscalls.prog_array.sys_enter)
3942 		trace__init_syscalls_bpf_prog_array_maps(trace);
3943 
3944 	if (trace->ev_qualifier_ids.nr > 0) {
3945 		err = trace__set_ev_qualifier_filter(trace);
3946 		if (err < 0)
3947 			goto out_errno;
3948 
3949 		if (trace->syscalls.events.sys_exit) {
3950 			pr_debug("event qualifier tracepoint filter: %s\n",
3951 				 trace->syscalls.events.sys_exit->filter);
3952 		}
3953 	}
3954 
3955 	/*
3956 	 * If the "close" syscall is not traced, then we will not have the
3957 	 * opportunity to, in syscall_arg__scnprintf_close_fd() invalidate the
3958 	 * fd->pathname table and were ending up showing the last value set by
3959 	 * syscalls opening a pathname and associating it with a descriptor or
3960 	 * reading it from /proc/pid/fd/ in cases where that doesn't make
3961 	 * sense.
3962 	 *
3963 	 *  So just disable this beautifier (SCA_FD, SCA_FDAT) when 'close' is
3964 	 *  not in use.
3965 	 */
3966 	trace->fd_path_disabled = !trace__syscall_enabled(trace, syscalltbl__id(trace->sctbl, "close"));
3967 
3968 	err = trace__expand_filters(trace, &evsel);
3969 	if (err)
3970 		goto out_delete_evlist;
3971 	err = perf_evlist__apply_filters(evlist, &evsel);
3972 	if (err < 0)
3973 		goto out_error_apply_filters;
3974 
3975 	if (trace->dump.map)
3976 		bpf_map__fprintf(trace->dump.map, trace->output);
3977 
3978 	err = evlist__mmap(evlist, trace->opts.mmap_pages);
3979 	if (err < 0)
3980 		goto out_error_mmap;
3981 
3982 	if (!target__none(&trace->opts.target) && !trace->opts.initial_delay)
3983 		evlist__enable(evlist);
3984 
3985 	if (forks)
3986 		perf_evlist__start_workload(evlist);
3987 
3988 	if (trace->opts.initial_delay) {
3989 		usleep(trace->opts.initial_delay * 1000);
3990 		evlist__enable(evlist);
3991 	}
3992 
3993 	trace->multiple_threads = perf_thread_map__pid(evlist->core.threads, 0) == -1 ||
3994 				  evlist->core.threads->nr > 1 ||
3995 				  evlist__first(evlist)->core.attr.inherit;
3996 
3997 	/*
3998 	 * Now that we already used evsel->core.attr to ask the kernel to setup the
3999 	 * events, lets reuse evsel->core.attr.sample_max_stack as the limit in
4000 	 * trace__resolve_callchain(), allowing per-event max-stack settings
4001 	 * to override an explicitly set --max-stack global setting.
4002 	 */
4003 	evlist__for_each_entry(evlist, evsel) {
4004 		if (evsel__has_callchain(evsel) &&
4005 		    evsel->core.attr.sample_max_stack == 0)
4006 			evsel->core.attr.sample_max_stack = trace->max_stack;
4007 	}
4008 again:
4009 	before = trace->nr_events;
4010 
4011 	for (i = 0; i < evlist->core.nr_mmaps; i++) {
4012 		union perf_event *event;
4013 		struct mmap *md;
4014 
4015 		md = &evlist->mmap[i];
4016 		if (perf_mmap__read_init(&md->core) < 0)
4017 			continue;
4018 
4019 		while ((event = perf_mmap__read_event(&md->core)) != NULL) {
4020 			++trace->nr_events;
4021 
4022 			err = trace__deliver_event(trace, event);
4023 			if (err)
4024 				goto out_disable;
4025 
4026 			perf_mmap__consume(&md->core);
4027 
4028 			if (interrupted)
4029 				goto out_disable;
4030 
4031 			if (done && !draining) {
4032 				evlist__disable(evlist);
4033 				draining = true;
4034 			}
4035 		}
4036 		perf_mmap__read_done(&md->core);
4037 	}
4038 
4039 	if (trace->nr_events == before) {
4040 		int timeout = done ? 100 : -1;
4041 
4042 		if (!draining && evlist__poll(evlist, timeout) > 0) {
4043 			if (evlist__filter_pollfd(evlist, POLLERR | POLLHUP | POLLNVAL) == 0)
4044 				draining = true;
4045 
4046 			goto again;
4047 		} else {
4048 			if (trace__flush_events(trace))
4049 				goto out_disable;
4050 		}
4051 	} else {
4052 		goto again;
4053 	}
4054 
4055 out_disable:
4056 	thread__zput(trace->current);
4057 
4058 	evlist__disable(evlist);
4059 
4060 	if (trace->sort_events)
4061 		ordered_events__flush(&trace->oe.data, OE_FLUSH__FINAL);
4062 
4063 	if (!err) {
4064 		if (trace->summary)
4065 			trace__fprintf_thread_summary(trace, trace->output);
4066 
4067 		if (trace->show_tool_stats) {
4068 			fprintf(trace->output, "Stats:\n "
4069 					       " vfs_getname : %" PRIu64 "\n"
4070 					       " proc_getname: %" PRIu64 "\n",
4071 				trace->stats.vfs_getname,
4072 				trace->stats.proc_getname);
4073 		}
4074 	}
4075 
4076 out_delete_evlist:
4077 	trace__symbols__exit(trace);
4078 
4079 	evlist__delete(evlist);
4080 	cgroup__put(trace->cgroup);
4081 	trace->evlist = NULL;
4082 	trace->live = false;
4083 	return err;
4084 {
4085 	char errbuf[BUFSIZ];
4086 
4087 out_error_sched_stat_runtime:
4088 	tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "sched", "sched_stat_runtime");
4089 	goto out_error;
4090 
4091 out_error_raw_syscalls:
4092 	tracing_path__strerror_open_tp(errno, errbuf, sizeof(errbuf), "raw_syscalls", "sys_(enter|exit)");
4093 	goto out_error;
4094 
4095 out_error_mmap:
4096 	perf_evlist__strerror_mmap(evlist, errno, errbuf, sizeof(errbuf));
4097 	goto out_error;
4098 
4099 out_error_open:
4100 	perf_evlist__strerror_open(evlist, errno, errbuf, sizeof(errbuf));
4101 
4102 out_error:
4103 	fprintf(trace->output, "%s\n", errbuf);
4104 	goto out_delete_evlist;
4105 
4106 out_error_apply_filters:
4107 	fprintf(trace->output,
4108 		"Failed to set filter \"%s\" on event %s with %d (%s)\n",
4109 		evsel->filter, perf_evsel__name(evsel), errno,
4110 		str_error_r(errno, errbuf, sizeof(errbuf)));
4111 	goto out_delete_evlist;
4112 }
4113 out_error_mem:
4114 	fprintf(trace->output, "Not enough memory to run!\n");
4115 	goto out_delete_evlist;
4116 
4117 out_errno:
4118 	fprintf(trace->output, "errno=%d,%s\n", errno, strerror(errno));
4119 	goto out_delete_evlist;
4120 }
4121 
4122 static int trace__replay(struct trace *trace)
4123 {
4124 	const struct evsel_str_handler handlers[] = {
4125 		{ "probe:vfs_getname",	     trace__vfs_getname, },
4126 	};
4127 	struct perf_data data = {
4128 		.path  = input_name,
4129 		.mode  = PERF_DATA_MODE_READ,
4130 		.force = trace->force,
4131 	};
4132 	struct perf_session *session;
4133 	struct evsel *evsel;
4134 	int err = -1;
4135 
4136 	trace->tool.sample	  = trace__process_sample;
4137 	trace->tool.mmap	  = perf_event__process_mmap;
4138 	trace->tool.mmap2	  = perf_event__process_mmap2;
4139 	trace->tool.comm	  = perf_event__process_comm;
4140 	trace->tool.exit	  = perf_event__process_exit;
4141 	trace->tool.fork	  = perf_event__process_fork;
4142 	trace->tool.attr	  = perf_event__process_attr;
4143 	trace->tool.tracing_data  = perf_event__process_tracing_data;
4144 	trace->tool.build_id	  = perf_event__process_build_id;
4145 	trace->tool.namespaces	  = perf_event__process_namespaces;
4146 
4147 	trace->tool.ordered_events = true;
4148 	trace->tool.ordering_requires_timestamps = true;
4149 
4150 	/* add tid to output */
4151 	trace->multiple_threads = true;
4152 
4153 	session = perf_session__new(&data, false, &trace->tool);
4154 	if (IS_ERR(session))
4155 		return PTR_ERR(session);
4156 
4157 	if (trace->opts.target.pid)
4158 		symbol_conf.pid_list_str = strdup(trace->opts.target.pid);
4159 
4160 	if (trace->opts.target.tid)
4161 		symbol_conf.tid_list_str = strdup(trace->opts.target.tid);
4162 
4163 	if (symbol__init(&session->header.env) < 0)
4164 		goto out;
4165 
4166 	trace->host = &session->machines.host;
4167 
4168 	err = perf_session__set_tracepoints_handlers(session, handlers);
4169 	if (err)
4170 		goto out;
4171 
4172 	evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
4173 						     "raw_syscalls:sys_enter");
4174 	/* older kernels have syscalls tp versus raw_syscalls */
4175 	if (evsel == NULL)
4176 		evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
4177 							     "syscalls:sys_enter");
4178 
4179 	if (evsel &&
4180 	    (perf_evsel__init_raw_syscall_tp(evsel, trace__sys_enter) < 0 ||
4181 	    perf_evsel__init_sc_tp_ptr_field(evsel, args))) {
4182 		pr_err("Error during initialize raw_syscalls:sys_enter event\n");
4183 		goto out;
4184 	}
4185 
4186 	evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
4187 						     "raw_syscalls:sys_exit");
4188 	if (evsel == NULL)
4189 		evsel = perf_evlist__find_tracepoint_by_name(session->evlist,
4190 							     "syscalls:sys_exit");
4191 	if (evsel &&
4192 	    (perf_evsel__init_raw_syscall_tp(evsel, trace__sys_exit) < 0 ||
4193 	    perf_evsel__init_sc_tp_uint_field(evsel, ret))) {
4194 		pr_err("Error during initialize raw_syscalls:sys_exit event\n");
4195 		goto out;
4196 	}
4197 
4198 	evlist__for_each_entry(session->evlist, evsel) {
4199 		if (evsel->core.attr.type == PERF_TYPE_SOFTWARE &&
4200 		    (evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MAJ ||
4201 		     evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS_MIN ||
4202 		     evsel->core.attr.config == PERF_COUNT_SW_PAGE_FAULTS))
4203 			evsel->handler = trace__pgfault;
4204 	}
4205 
4206 	setup_pager();
4207 
4208 	err = perf_session__process_events(session);
4209 	if (err)
4210 		pr_err("Failed to process events, error %d", err);
4211 
4212 	else if (trace->summary)
4213 		trace__fprintf_thread_summary(trace, trace->output);
4214 
4215 out:
4216 	perf_session__delete(session);
4217 
4218 	return err;
4219 }
4220 
4221 static size_t trace__fprintf_threads_header(FILE *fp)
4222 {
4223 	size_t printed;
4224 
4225 	printed  = fprintf(fp, "\n Summary of events:\n\n");
4226 
4227 	return printed;
4228 }
4229 
4230 DEFINE_RESORT_RB(syscall_stats, a->msecs > b->msecs,
4231 	struct syscall_stats *stats;
4232 	double		     msecs;
4233 	int		     syscall;
4234 )
4235 {
4236 	struct int_node *source = rb_entry(nd, struct int_node, rb_node);
4237 	struct syscall_stats *stats = source->priv;
4238 
4239 	entry->syscall = source->i;
4240 	entry->stats   = stats;
4241 	entry->msecs   = stats ? (u64)stats->stats.n * (avg_stats(&stats->stats) / NSEC_PER_MSEC) : 0;
4242 }
4243 
4244 static size_t thread__dump_stats(struct thread_trace *ttrace,
4245 				 struct trace *trace, FILE *fp)
4246 {
4247 	size_t printed = 0;
4248 	struct syscall *sc;
4249 	struct rb_node *nd;
4250 	DECLARE_RESORT_RB_INTLIST(syscall_stats, ttrace->syscall_stats);
4251 
4252 	if (syscall_stats == NULL)
4253 		return 0;
4254 
4255 	printed += fprintf(fp, "\n");
4256 
4257 	printed += fprintf(fp, "   syscall            calls  errors  total       min       avg       max       stddev\n");
4258 	printed += fprintf(fp, "                                     (msec)    (msec)    (msec)    (msec)        (%%)\n");
4259 	printed += fprintf(fp, "   --------------- --------  ------ -------- --------- --------- ---------     ------\n");
4260 
4261 	resort_rb__for_each_entry(nd, syscall_stats) {
4262 		struct syscall_stats *stats = syscall_stats_entry->stats;
4263 		if (stats) {
4264 			double min = (double)(stats->stats.min) / NSEC_PER_MSEC;
4265 			double max = (double)(stats->stats.max) / NSEC_PER_MSEC;
4266 			double avg = avg_stats(&stats->stats);
4267 			double pct;
4268 			u64 n = (u64)stats->stats.n;
4269 
4270 			pct = avg ? 100.0 * stddev_stats(&stats->stats) / avg : 0.0;
4271 			avg /= NSEC_PER_MSEC;
4272 
4273 			sc = &trace->syscalls.table[syscall_stats_entry->syscall];
4274 			printed += fprintf(fp, "   %-15s", sc->name);
4275 			printed += fprintf(fp, " %8" PRIu64 " %6" PRIu64 " %9.3f %9.3f %9.3f",
4276 					   n, stats->nr_failures, syscall_stats_entry->msecs, min, avg);
4277 			printed += fprintf(fp, " %9.3f %9.2f%%\n", max, pct);
4278 
4279 			if (trace->errno_summary && stats->nr_failures) {
4280 				const char *arch_name = perf_env__arch(trace->host->env);
4281 				int e;
4282 
4283 				for (e = 0; e < stats->max_errno; ++e) {
4284 					if (stats->errnos[e] != 0)
4285 						fprintf(fp, "\t\t\t\t%s: %d\n", arch_syscalls__strerrno(arch_name, e + 1), stats->errnos[e]);
4286 				}
4287 			}
4288 		}
4289 	}
4290 
4291 	resort_rb__delete(syscall_stats);
4292 	printed += fprintf(fp, "\n\n");
4293 
4294 	return printed;
4295 }
4296 
4297 static size_t trace__fprintf_thread(FILE *fp, struct thread *thread, struct trace *trace)
4298 {
4299 	size_t printed = 0;
4300 	struct thread_trace *ttrace = thread__priv(thread);
4301 	double ratio;
4302 
4303 	if (ttrace == NULL)
4304 		return 0;
4305 
4306 	ratio = (double)ttrace->nr_events / trace->nr_events * 100.0;
4307 
4308 	printed += fprintf(fp, " %s (%d), ", thread__comm_str(thread), thread->tid);
4309 	printed += fprintf(fp, "%lu events, ", ttrace->nr_events);
4310 	printed += fprintf(fp, "%.1f%%", ratio);
4311 	if (ttrace->pfmaj)
4312 		printed += fprintf(fp, ", %lu majfaults", ttrace->pfmaj);
4313 	if (ttrace->pfmin)
4314 		printed += fprintf(fp, ", %lu minfaults", ttrace->pfmin);
4315 	if (trace->sched)
4316 		printed += fprintf(fp, ", %.3f msec\n", ttrace->runtime_ms);
4317 	else if (fputc('\n', fp) != EOF)
4318 		++printed;
4319 
4320 	printed += thread__dump_stats(ttrace, trace, fp);
4321 
4322 	return printed;
4323 }
4324 
4325 static unsigned long thread__nr_events(struct thread_trace *ttrace)
4326 {
4327 	return ttrace ? ttrace->nr_events : 0;
4328 }
4329 
4330 DEFINE_RESORT_RB(threads, (thread__nr_events(a->thread->priv) < thread__nr_events(b->thread->priv)),
4331 	struct thread *thread;
4332 )
4333 {
4334 	entry->thread = rb_entry(nd, struct thread, rb_node);
4335 }
4336 
4337 static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp)
4338 {
4339 	size_t printed = trace__fprintf_threads_header(fp);
4340 	struct rb_node *nd;
4341 	int i;
4342 
4343 	for (i = 0; i < THREADS__TABLE_SIZE; i++) {
4344 		DECLARE_RESORT_RB_MACHINE_THREADS(threads, trace->host, i);
4345 
4346 		if (threads == NULL) {
4347 			fprintf(fp, "%s", "Error sorting output by nr_events!\n");
4348 			return 0;
4349 		}
4350 
4351 		resort_rb__for_each_entry(nd, threads)
4352 			printed += trace__fprintf_thread(fp, threads_entry->thread, trace);
4353 
4354 		resort_rb__delete(threads);
4355 	}
4356 	return printed;
4357 }
4358 
4359 static int trace__set_duration(const struct option *opt, const char *str,
4360 			       int unset __maybe_unused)
4361 {
4362 	struct trace *trace = opt->value;
4363 
4364 	trace->duration_filter = atof(str);
4365 	return 0;
4366 }
4367 
4368 static int trace__set_filter_pids_from_option(const struct option *opt, const char *str,
4369 					      int unset __maybe_unused)
4370 {
4371 	int ret = -1;
4372 	size_t i;
4373 	struct trace *trace = opt->value;
4374 	/*
4375 	 * FIXME: introduce a intarray class, plain parse csv and create a
4376 	 * { int nr, int entries[] } struct...
4377 	 */
4378 	struct intlist *list = intlist__new(str);
4379 
4380 	if (list == NULL)
4381 		return -1;
4382 
4383 	i = trace->filter_pids.nr = intlist__nr_entries(list) + 1;
4384 	trace->filter_pids.entries = calloc(i, sizeof(pid_t));
4385 
4386 	if (trace->filter_pids.entries == NULL)
4387 		goto out;
4388 
4389 	trace->filter_pids.entries[0] = getpid();
4390 
4391 	for (i = 1; i < trace->filter_pids.nr; ++i)
4392 		trace->filter_pids.entries[i] = intlist__entry(list, i - 1)->i;
4393 
4394 	intlist__delete(list);
4395 	ret = 0;
4396 out:
4397 	return ret;
4398 }
4399 
4400 static int trace__open_output(struct trace *trace, const char *filename)
4401 {
4402 	struct stat st;
4403 
4404 	if (!stat(filename, &st) && st.st_size) {
4405 		char oldname[PATH_MAX];
4406 
4407 		scnprintf(oldname, sizeof(oldname), "%s.old", filename);
4408 		unlink(oldname);
4409 		rename(filename, oldname);
4410 	}
4411 
4412 	trace->output = fopen(filename, "w");
4413 
4414 	return trace->output == NULL ? -errno : 0;
4415 }
4416 
4417 static int parse_pagefaults(const struct option *opt, const char *str,
4418 			    int unset __maybe_unused)
4419 {
4420 	int *trace_pgfaults = opt->value;
4421 
4422 	if (strcmp(str, "all") == 0)
4423 		*trace_pgfaults |= TRACE_PFMAJ | TRACE_PFMIN;
4424 	else if (strcmp(str, "maj") == 0)
4425 		*trace_pgfaults |= TRACE_PFMAJ;
4426 	else if (strcmp(str, "min") == 0)
4427 		*trace_pgfaults |= TRACE_PFMIN;
4428 	else
4429 		return -1;
4430 
4431 	return 0;
4432 }
4433 
4434 static void evlist__set_default_evsel_handler(struct evlist *evlist, void *handler)
4435 {
4436 	struct evsel *evsel;
4437 
4438 	evlist__for_each_entry(evlist, evsel) {
4439 		if (evsel->handler == NULL)
4440 			evsel->handler = handler;
4441 	}
4442 }
4443 
4444 static void evsel__set_syscall_arg_fmt(struct evsel *evsel, const char *name)
4445 {
4446 	struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel);
4447 
4448 	if (fmt) {
4449 		struct syscall_fmt *scfmt = syscall_fmt__find(name);
4450 
4451 		if (scfmt) {
4452 			int skip = 0;
4453 
4454 			if (strcmp(evsel->tp_format->format.fields->name, "__syscall_nr") == 0 ||
4455 			    strcmp(evsel->tp_format->format.fields->name, "nr") == 0)
4456 				++skip;
4457 
4458 			memcpy(fmt + skip, scfmt->arg, (evsel->tp_format->format.nr_fields - skip) * sizeof(*fmt));
4459 		}
4460 	}
4461 }
4462 
4463 static int evlist__set_syscall_tp_fields(struct evlist *evlist)
4464 {
4465 	struct evsel *evsel;
4466 
4467 	evlist__for_each_entry(evlist, evsel) {
4468 		if (evsel->priv || !evsel->tp_format)
4469 			continue;
4470 
4471 		if (strcmp(evsel->tp_format->system, "syscalls")) {
4472 			perf_evsel__init_tp_arg_scnprintf(evsel);
4473 			continue;
4474 		}
4475 
4476 		if (perf_evsel__init_syscall_tp(evsel))
4477 			return -1;
4478 
4479 		if (!strncmp(evsel->tp_format->name, "sys_enter_", 10)) {
4480 			struct syscall_tp *sc = __evsel__syscall_tp(evsel);
4481 
4482 			if (__tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64)))
4483 				return -1;
4484 
4485 			evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_enter_") - 1);
4486 		} else if (!strncmp(evsel->tp_format->name, "sys_exit_", 9)) {
4487 			struct syscall_tp *sc = __evsel__syscall_tp(evsel);
4488 
4489 			if (__tp_field__init_uint(&sc->ret, sizeof(u64), sc->id.offset + sizeof(u64), evsel->needs_swap))
4490 				return -1;
4491 
4492 			evsel__set_syscall_arg_fmt(evsel, evsel->tp_format->name + sizeof("sys_exit_") - 1);
4493 		}
4494 	}
4495 
4496 	return 0;
4497 }
4498 
4499 /*
4500  * XXX: Hackish, just splitting the combined -e+--event (syscalls
4501  * (raw_syscalls:{sys_{enter,exit}} + events (tracepoints, HW, SW, etc) to use
4502  * existing facilities unchanged (trace->ev_qualifier + parse_options()).
4503  *
4504  * It'd be better to introduce a parse_options() variant that would return a
4505  * list with the terms it didn't match to an event...
4506  */
4507 static int trace__parse_events_option(const struct option *opt, const char *str,
4508 				      int unset __maybe_unused)
4509 {
4510 	struct trace *trace = (struct trace *)opt->value;
4511 	const char *s = str;
4512 	char *sep = NULL, *lists[2] = { NULL, NULL, };
4513 	int len = strlen(str) + 1, err = -1, list, idx;
4514 	char *strace_groups_dir = system_path(STRACE_GROUPS_DIR);
4515 	char group_name[PATH_MAX];
4516 	struct syscall_fmt *fmt;
4517 
4518 	if (strace_groups_dir == NULL)
4519 		return -1;
4520 
4521 	if (*s == '!') {
4522 		++s;
4523 		trace->not_ev_qualifier = true;
4524 	}
4525 
4526 	while (1) {
4527 		if ((sep = strchr(s, ',')) != NULL)
4528 			*sep = '\0';
4529 
4530 		list = 0;
4531 		if (syscalltbl__id(trace->sctbl, s) >= 0 ||
4532 		    syscalltbl__strglobmatch_first(trace->sctbl, s, &idx) >= 0) {
4533 			list = 1;
4534 			goto do_concat;
4535 		}
4536 
4537 		fmt = syscall_fmt__find_by_alias(s);
4538 		if (fmt != NULL) {
4539 			list = 1;
4540 			s = fmt->name;
4541 		} else {
4542 			path__join(group_name, sizeof(group_name), strace_groups_dir, s);
4543 			if (access(group_name, R_OK) == 0)
4544 				list = 1;
4545 		}
4546 do_concat:
4547 		if (lists[list]) {
4548 			sprintf(lists[list] + strlen(lists[list]), ",%s", s);
4549 		} else {
4550 			lists[list] = malloc(len);
4551 			if (lists[list] == NULL)
4552 				goto out;
4553 			strcpy(lists[list], s);
4554 		}
4555 
4556 		if (!sep)
4557 			break;
4558 
4559 		*sep = ',';
4560 		s = sep + 1;
4561 	}
4562 
4563 	if (lists[1] != NULL) {
4564 		struct strlist_config slist_config = {
4565 			.dirname = strace_groups_dir,
4566 		};
4567 
4568 		trace->ev_qualifier = strlist__new(lists[1], &slist_config);
4569 		if (trace->ev_qualifier == NULL) {
4570 			fputs("Not enough memory to parse event qualifier", trace->output);
4571 			goto out;
4572 		}
4573 
4574 		if (trace__validate_ev_qualifier(trace))
4575 			goto out;
4576 		trace->trace_syscalls = true;
4577 	}
4578 
4579 	err = 0;
4580 
4581 	if (lists[0]) {
4582 		struct option o = OPT_CALLBACK('e', "event", &trace->evlist, "event",
4583 					       "event selector. use 'perf list' to list available events",
4584 					       parse_events_option);
4585 		err = parse_events_option(&o, lists[0], 0);
4586 	}
4587 out:
4588 	if (sep)
4589 		*sep = ',';
4590 
4591 	return err;
4592 }
4593 
4594 static int trace__parse_cgroups(const struct option *opt, const char *str, int unset)
4595 {
4596 	struct trace *trace = opt->value;
4597 
4598 	if (!list_empty(&trace->evlist->core.entries))
4599 		return parse_cgroups(opt, str, unset);
4600 
4601 	trace->cgroup = evlist__findnew_cgroup(trace->evlist, str);
4602 
4603 	return 0;
4604 }
4605 
4606 static struct bpf_map *trace__find_bpf_map_by_name(struct trace *trace, const char *name)
4607 {
4608 	if (trace->bpf_obj == NULL)
4609 		return NULL;
4610 
4611 	return bpf_object__find_map_by_name(trace->bpf_obj, name);
4612 }
4613 
4614 static void trace__set_bpf_map_filtered_pids(struct trace *trace)
4615 {
4616 	trace->filter_pids.map = trace__find_bpf_map_by_name(trace, "pids_filtered");
4617 }
4618 
4619 static void trace__set_bpf_map_syscalls(struct trace *trace)
4620 {
4621 	trace->syscalls.map = trace__find_bpf_map_by_name(trace, "syscalls");
4622 	trace->syscalls.prog_array.sys_enter = trace__find_bpf_map_by_name(trace, "syscalls_sys_enter");
4623 	trace->syscalls.prog_array.sys_exit  = trace__find_bpf_map_by_name(trace, "syscalls_sys_exit");
4624 }
4625 
4626 static int trace__config(const char *var, const char *value, void *arg)
4627 {
4628 	struct trace *trace = arg;
4629 	int err = 0;
4630 
4631 	if (!strcmp(var, "trace.add_events")) {
4632 		trace->perfconfig_events = strdup(value);
4633 		if (trace->perfconfig_events == NULL) {
4634 			pr_err("Not enough memory for %s\n", "trace.add_events");
4635 			return -1;
4636 		}
4637 	} else if (!strcmp(var, "trace.show_timestamp")) {
4638 		trace->show_tstamp = perf_config_bool(var, value);
4639 	} else if (!strcmp(var, "trace.show_duration")) {
4640 		trace->show_duration = perf_config_bool(var, value);
4641 	} else if (!strcmp(var, "trace.show_arg_names")) {
4642 		trace->show_arg_names = perf_config_bool(var, value);
4643 		if (!trace->show_arg_names)
4644 			trace->show_zeros = true;
4645 	} else if (!strcmp(var, "trace.show_zeros")) {
4646 		bool new_show_zeros = perf_config_bool(var, value);
4647 		if (!trace->show_arg_names && !new_show_zeros) {
4648 			pr_warning("trace.show_zeros has to be set when trace.show_arg_names=no\n");
4649 			goto out;
4650 		}
4651 		trace->show_zeros = new_show_zeros;
4652 	} else if (!strcmp(var, "trace.show_prefix")) {
4653 		trace->show_string_prefix = perf_config_bool(var, value);
4654 	} else if (!strcmp(var, "trace.no_inherit")) {
4655 		trace->opts.no_inherit = perf_config_bool(var, value);
4656 	} else if (!strcmp(var, "trace.args_alignment")) {
4657 		int args_alignment = 0;
4658 		if (perf_config_int(&args_alignment, var, value) == 0)
4659 			trace->args_alignment = args_alignment;
4660 	} else if (!strcmp(var, "trace.tracepoint_beautifiers")) {
4661 		if (strcasecmp(value, "libtraceevent") == 0)
4662 			trace->libtraceevent_print = true;
4663 		else if (strcasecmp(value, "libbeauty") == 0)
4664 			trace->libtraceevent_print = false;
4665 	}
4666 out:
4667 	return err;
4668 }
4669 
4670 int cmd_trace(int argc, const char **argv)
4671 {
4672 	const char *trace_usage[] = {
4673 		"perf trace [<options>] [<command>]",
4674 		"perf trace [<options>] -- <command> [<options>]",
4675 		"perf trace record [<options>] [<command>]",
4676 		"perf trace record [<options>] -- <command> [<options>]",
4677 		NULL
4678 	};
4679 	struct trace trace = {
4680 		.opts = {
4681 			.target = {
4682 				.uid	   = UINT_MAX,
4683 				.uses_mmap = true,
4684 			},
4685 			.user_freq     = UINT_MAX,
4686 			.user_interval = ULLONG_MAX,
4687 			.no_buffering  = true,
4688 			.mmap_pages    = UINT_MAX,
4689 		},
4690 		.output = stderr,
4691 		.show_comm = true,
4692 		.show_tstamp = true,
4693 		.show_duration = true,
4694 		.show_arg_names = true,
4695 		.args_alignment = 70,
4696 		.trace_syscalls = false,
4697 		.kernel_syscallchains = false,
4698 		.max_stack = UINT_MAX,
4699 		.max_events = ULONG_MAX,
4700 	};
4701 	const char *map_dump_str = NULL;
4702 	const char *output_name = NULL;
4703 	const struct option trace_options[] = {
4704 	OPT_CALLBACK('e', "event", &trace, "event",
4705 		     "event/syscall selector. use 'perf list' to list available events",
4706 		     trace__parse_events_option),
4707 	OPT_CALLBACK(0, "filter", &trace.evlist, "filter",
4708 		     "event filter", parse_filter),
4709 	OPT_BOOLEAN(0, "comm", &trace.show_comm,
4710 		    "show the thread COMM next to its id"),
4711 	OPT_BOOLEAN(0, "tool_stats", &trace.show_tool_stats, "show tool stats"),
4712 	OPT_CALLBACK(0, "expr", &trace, "expr", "list of syscalls/events to trace",
4713 		     trace__parse_events_option),
4714 	OPT_STRING('o', "output", &output_name, "file", "output file name"),
4715 	OPT_STRING('i', "input", &input_name, "file", "Analyze events in file"),
4716 	OPT_STRING('p', "pid", &trace.opts.target.pid, "pid",
4717 		    "trace events on existing process id"),
4718 	OPT_STRING('t', "tid", &trace.opts.target.tid, "tid",
4719 		    "trace events on existing thread id"),
4720 	OPT_CALLBACK(0, "filter-pids", &trace, "CSV list of pids",
4721 		     "pids to filter (by the kernel)", trace__set_filter_pids_from_option),
4722 	OPT_BOOLEAN('a', "all-cpus", &trace.opts.target.system_wide,
4723 		    "system-wide collection from all CPUs"),
4724 	OPT_STRING('C', "cpu", &trace.opts.target.cpu_list, "cpu",
4725 		    "list of cpus to monitor"),
4726 	OPT_BOOLEAN(0, "no-inherit", &trace.opts.no_inherit,
4727 		    "child tasks do not inherit counters"),
4728 	OPT_CALLBACK('m', "mmap-pages", &trace.opts.mmap_pages, "pages",
4729 		     "number of mmap data pages",
4730 		     perf_evlist__parse_mmap_pages),
4731 	OPT_STRING('u', "uid", &trace.opts.target.uid_str, "user",
4732 		   "user to profile"),
4733 	OPT_CALLBACK(0, "duration", &trace, "float",
4734 		     "show only events with duration > N.M ms",
4735 		     trace__set_duration),
4736 #ifdef HAVE_LIBBPF_SUPPORT
4737 	OPT_STRING(0, "map-dump", &map_dump_str, "BPF map", "BPF map to periodically dump"),
4738 #endif
4739 	OPT_BOOLEAN(0, "sched", &trace.sched, "show blocking scheduler events"),
4740 	OPT_INCR('v', "verbose", &verbose, "be more verbose"),
4741 	OPT_BOOLEAN('T', "time", &trace.full_time,
4742 		    "Show full timestamp, not time relative to first start"),
4743 	OPT_BOOLEAN(0, "failure", &trace.failure_only,
4744 		    "Show only syscalls that failed"),
4745 	OPT_BOOLEAN('s', "summary", &trace.summary_only,
4746 		    "Show only syscall summary with statistics"),
4747 	OPT_BOOLEAN('S', "with-summary", &trace.summary,
4748 		    "Show all syscalls and summary with statistics"),
4749 	OPT_BOOLEAN(0, "errno-summary", &trace.errno_summary,
4750 		    "Show errno stats per syscall, use with -s or -S"),
4751 	OPT_CALLBACK_DEFAULT('F', "pf", &trace.trace_pgfaults, "all|maj|min",
4752 		     "Trace pagefaults", parse_pagefaults, "maj"),
4753 	OPT_BOOLEAN(0, "syscalls", &trace.trace_syscalls, "Trace syscalls"),
4754 	OPT_BOOLEAN('f', "force", &trace.force, "don't complain, do it"),
4755 	OPT_CALLBACK(0, "call-graph", &trace.opts,
4756 		     "record_mode[,record_size]", record_callchain_help,
4757 		     &record_parse_callchain_opt),
4758 	OPT_BOOLEAN(0, "libtraceevent_print", &trace.libtraceevent_print,
4759 		    "Use libtraceevent to print the tracepoint arguments."),
4760 	OPT_BOOLEAN(0, "kernel-syscall-graph", &trace.kernel_syscallchains,
4761 		    "Show the kernel callchains on the syscall exit path"),
4762 	OPT_ULONG(0, "max-events", &trace.max_events,
4763 		"Set the maximum number of events to print, exit after that is reached. "),
4764 	OPT_UINTEGER(0, "min-stack", &trace.min_stack,
4765 		     "Set the minimum stack depth when parsing the callchain, "
4766 		     "anything below the specified depth will be ignored."),
4767 	OPT_UINTEGER(0, "max-stack", &trace.max_stack,
4768 		     "Set the maximum stack depth when parsing the callchain, "
4769 		     "anything beyond the specified depth will be ignored. "
4770 		     "Default: kernel.perf_event_max_stack or " __stringify(PERF_MAX_STACK_DEPTH)),
4771 	OPT_BOOLEAN(0, "sort-events", &trace.sort_events,
4772 			"Sort batch of events before processing, use if getting out of order events"),
4773 	OPT_BOOLEAN(0, "print-sample", &trace.print_sample,
4774 			"print the PERF_RECORD_SAMPLE PERF_SAMPLE_ info, for debugging"),
4775 	OPT_UINTEGER(0, "proc-map-timeout", &proc_map_timeout,
4776 			"per thread proc mmap processing timeout in ms"),
4777 	OPT_CALLBACK('G', "cgroup", &trace, "name", "monitor event in cgroup name only",
4778 		     trace__parse_cgroups),
4779 	OPT_UINTEGER('D', "delay", &trace.opts.initial_delay,
4780 		     "ms to wait before starting measurement after program "
4781 		     "start"),
4782 	OPTS_EVSWITCH(&trace.evswitch),
4783 	OPT_END()
4784 	};
4785 	bool __maybe_unused max_stack_user_set = true;
4786 	bool mmap_pages_user_set = true;
4787 	struct evsel *evsel;
4788 	const char * const trace_subcommands[] = { "record", NULL };
4789 	int err = -1;
4790 	char bf[BUFSIZ];
4791 
4792 	signal(SIGSEGV, sighandler_dump_stack);
4793 	signal(SIGFPE, sighandler_dump_stack);
4794 
4795 	trace.evlist = evlist__new();
4796 	trace.sctbl = syscalltbl__new();
4797 
4798 	if (trace.evlist == NULL || trace.sctbl == NULL) {
4799 		pr_err("Not enough memory to run!\n");
4800 		err = -ENOMEM;
4801 		goto out;
4802 	}
4803 
4804 	/*
4805 	 * Parsing .perfconfig may entail creating a BPF event, that may need
4806 	 * to create BPF maps, so bump RLIM_MEMLOCK as the default 64K setting
4807 	 * is too small. This affects just this process, not touching the
4808 	 * global setting. If it fails we'll get something in 'perf trace -v'
4809 	 * to help diagnose the problem.
4810 	 */
4811 	rlimit__bump_memlock();
4812 
4813 	err = perf_config(trace__config, &trace);
4814 	if (err)
4815 		goto out;
4816 
4817 	argc = parse_options_subcommand(argc, argv, trace_options, trace_subcommands,
4818 				 trace_usage, PARSE_OPT_STOP_AT_NON_OPTION);
4819 
4820 	/*
4821 	 * Here we already passed thru trace__parse_events_option() and it has
4822 	 * already figured out if -e syscall_name, if not but if --event
4823 	 * foo:bar was used, the user is interested _just_ in those, say,
4824 	 * tracepoint events, not in the strace-like syscall-name-based mode.
4825 	 *
4826 	 * This is important because we need to check if strace-like mode is
4827 	 * needed to decided if we should filter out the eBPF
4828 	 * __augmented_syscalls__ code, if it is in the mix, say, via
4829 	 * .perfconfig trace.add_events, and filter those out.
4830 	 */
4831 	if (!trace.trace_syscalls && !trace.trace_pgfaults &&
4832 	    trace.evlist->core.nr_entries == 0 /* Was --events used? */) {
4833 		trace.trace_syscalls = true;
4834 	}
4835 	/*
4836 	 * Now that we have --verbose figured out, lets see if we need to parse
4837 	 * events from .perfconfig, so that if those events fail parsing, say some
4838 	 * BPF program fails, then we'll be able to use --verbose to see what went
4839 	 * wrong in more detail.
4840 	 */
4841 	if (trace.perfconfig_events != NULL) {
4842 		struct parse_events_error parse_err;
4843 
4844 		bzero(&parse_err, sizeof(parse_err));
4845 		err = parse_events(trace.evlist, trace.perfconfig_events, &parse_err);
4846 		if (err) {
4847 			parse_events_print_error(&parse_err, trace.perfconfig_events);
4848 			goto out;
4849 		}
4850 	}
4851 
4852 	if ((nr_cgroups || trace.cgroup) && !trace.opts.target.system_wide) {
4853 		usage_with_options_msg(trace_usage, trace_options,
4854 				       "cgroup monitoring only available in system-wide mode");
4855 	}
4856 
4857 	evsel = bpf__setup_output_event(trace.evlist, "__augmented_syscalls__");
4858 	if (IS_ERR(evsel)) {
4859 		bpf__strerror_setup_output_event(trace.evlist, PTR_ERR(evsel), bf, sizeof(bf));
4860 		pr_err("ERROR: Setup trace syscalls enter failed: %s\n", bf);
4861 		goto out;
4862 	}
4863 
4864 	if (evsel) {
4865 		trace.syscalls.events.augmented = evsel;
4866 
4867 		evsel = perf_evlist__find_tracepoint_by_name(trace.evlist, "raw_syscalls:sys_enter");
4868 		if (evsel == NULL) {
4869 			pr_err("ERROR: raw_syscalls:sys_enter not found in the augmented BPF object\n");
4870 			goto out;
4871 		}
4872 
4873 		if (evsel->bpf_obj == NULL) {
4874 			pr_err("ERROR: raw_syscalls:sys_enter not associated to a BPF object\n");
4875 			goto out;
4876 		}
4877 
4878 		trace.bpf_obj = evsel->bpf_obj;
4879 
4880 		/*
4881 		 * If we have _just_ the augmenter event but don't have a
4882 		 * explicit --syscalls, then assume we want all strace-like
4883 		 * syscalls:
4884 		 */
4885 		if (!trace.trace_syscalls && trace__only_augmented_syscalls_evsels(&trace))
4886 			trace.trace_syscalls = true;
4887 		/*
4888 		 * So, if we have a syscall augmenter, but trace_syscalls, aka
4889 		 * strace-like syscall tracing is not set, then we need to trow
4890 		 * away the augmenter, i.e. all the events that were created
4891 		 * from that BPF object file.
4892 		 *
4893 		 * This is more to fix the current .perfconfig trace.add_events
4894 		 * style of setting up the strace-like eBPF based syscall point
4895 		 * payload augmenter.
4896 		 *
4897 		 * All this complexity will be avoided by adding an alternative
4898 		 * to trace.add_events in the form of
4899 		 * trace.bpf_augmented_syscalls, that will be only parsed if we
4900 		 * need it.
4901 		 *
4902 		 * .perfconfig trace.add_events is still useful if we want, for
4903 		 * instance, have msr_write.msr in some .perfconfig profile based
4904 		 * 'perf trace --config determinism.profile' mode, where for some
4905 		 * particular goal/workload type we want a set of events and
4906 		 * output mode (with timings, etc) instead of having to add
4907 		 * all via the command line.
4908 		 *
4909 		 * Also --config to specify an alternate .perfconfig file needs
4910 		 * to be implemented.
4911 		 */
4912 		if (!trace.trace_syscalls) {
4913 			trace__delete_augmented_syscalls(&trace);
4914 		} else {
4915 			trace__set_bpf_map_filtered_pids(&trace);
4916 			trace__set_bpf_map_syscalls(&trace);
4917 			trace.syscalls.unaugmented_prog = trace__find_bpf_program_by_title(&trace, "!raw_syscalls:unaugmented");
4918 		}
4919 	}
4920 
4921 	err = bpf__setup_stdout(trace.evlist);
4922 	if (err) {
4923 		bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf));
4924 		pr_err("ERROR: Setup BPF stdout failed: %s\n", bf);
4925 		goto out;
4926 	}
4927 
4928 	err = -1;
4929 
4930 	if (map_dump_str) {
4931 		trace.dump.map = trace__find_bpf_map_by_name(&trace, map_dump_str);
4932 		if (trace.dump.map == NULL) {
4933 			pr_err("ERROR: BPF map \"%s\" not found\n", map_dump_str);
4934 			goto out;
4935 		}
4936 	}
4937 
4938 	if (trace.trace_pgfaults) {
4939 		trace.opts.sample_address = true;
4940 		trace.opts.sample_time = true;
4941 	}
4942 
4943 	if (trace.opts.mmap_pages == UINT_MAX)
4944 		mmap_pages_user_set = false;
4945 
4946 	if (trace.max_stack == UINT_MAX) {
4947 		trace.max_stack = input_name ? PERF_MAX_STACK_DEPTH : sysctl__max_stack();
4948 		max_stack_user_set = false;
4949 	}
4950 
4951 #ifdef HAVE_DWARF_UNWIND_SUPPORT
4952 	if ((trace.min_stack || max_stack_user_set) && !callchain_param.enabled) {
4953 		record_opts__parse_callchain(&trace.opts, &callchain_param, "dwarf", false);
4954 	}
4955 #endif
4956 
4957 	if (callchain_param.enabled) {
4958 		if (!mmap_pages_user_set && geteuid() == 0)
4959 			trace.opts.mmap_pages = perf_event_mlock_kb_in_pages() * 4;
4960 
4961 		symbol_conf.use_callchain = true;
4962 	}
4963 
4964 	if (trace.evlist->core.nr_entries > 0) {
4965 		evlist__set_default_evsel_handler(trace.evlist, trace__event_handler);
4966 		if (evlist__set_syscall_tp_fields(trace.evlist)) {
4967 			perror("failed to set syscalls:* tracepoint fields");
4968 			goto out;
4969 		}
4970 	}
4971 
4972 	if (trace.sort_events) {
4973 		ordered_events__init(&trace.oe.data, ordered_events__deliver_event, &trace);
4974 		ordered_events__set_copy_on_queue(&trace.oe.data, true);
4975 	}
4976 
4977 	/*
4978 	 * If we are augmenting syscalls, then combine what we put in the
4979 	 * __augmented_syscalls__ BPF map with what is in the
4980 	 * syscalls:sys_exit_FOO tracepoints, i.e. just like we do without BPF,
4981 	 * combining raw_syscalls:sys_enter with raw_syscalls:sys_exit.
4982 	 *
4983 	 * We'll switch to look at two BPF maps, one for sys_enter and the
4984 	 * other for sys_exit when we start augmenting the sys_exit paths with
4985 	 * buffers that are being copied from kernel to userspace, think 'read'
4986 	 * syscall.
4987 	 */
4988 	if (trace.syscalls.events.augmented) {
4989 		evlist__for_each_entry(trace.evlist, evsel) {
4990 			bool raw_syscalls_sys_exit = strcmp(perf_evsel__name(evsel), "raw_syscalls:sys_exit") == 0;
4991 
4992 			if (raw_syscalls_sys_exit) {
4993 				trace.raw_augmented_syscalls = true;
4994 				goto init_augmented_syscall_tp;
4995 			}
4996 
4997 			if (trace.syscalls.events.augmented->priv == NULL &&
4998 			    strstr(perf_evsel__name(evsel), "syscalls:sys_enter")) {
4999 				struct evsel *augmented = trace.syscalls.events.augmented;
5000 				if (perf_evsel__init_augmented_syscall_tp(augmented, evsel) ||
5001 				    perf_evsel__init_augmented_syscall_tp_args(augmented))
5002 					goto out;
5003 				/*
5004 				 * Augmented is __augmented_syscalls__ BPF_OUTPUT event
5005 				 * Above we made sure we can get from the payload the tp fields
5006 				 * that we get from syscalls:sys_enter tracefs format file.
5007 				 */
5008 				augmented->handler = trace__sys_enter;
5009 				/*
5010 				 * Now we do the same for the *syscalls:sys_enter event so that
5011 				 * if we handle it directly, i.e. if the BPF prog returns 0 so
5012 				 * as not to filter it, then we'll handle it just like we would
5013 				 * for the BPF_OUTPUT one:
5014 				 */
5015 				if (perf_evsel__init_augmented_syscall_tp(evsel, evsel) ||
5016 				    perf_evsel__init_augmented_syscall_tp_args(evsel))
5017 					goto out;
5018 				evsel->handler = trace__sys_enter;
5019 			}
5020 
5021 			if (strstarts(perf_evsel__name(evsel), "syscalls:sys_exit_")) {
5022 				struct syscall_tp *sc;
5023 init_augmented_syscall_tp:
5024 				if (perf_evsel__init_augmented_syscall_tp(evsel, evsel))
5025 					goto out;
5026 				sc = __evsel__syscall_tp(evsel);
5027 				/*
5028 				 * For now with BPF raw_augmented we hook into
5029 				 * raw_syscalls:sys_enter and there we get all
5030 				 * 6 syscall args plus the tracepoint common
5031 				 * fields and the syscall_nr (another long).
5032 				 * So we check if that is the case and if so
5033 				 * don't look after the sc->args_size but
5034 				 * always after the full raw_syscalls:sys_enter
5035 				 * payload, which is fixed.
5036 				 *
5037 				 * We'll revisit this later to pass
5038 				 * s->args_size to the BPF augmenter (now
5039 				 * tools/perf/examples/bpf/augmented_raw_syscalls.c,
5040 				 * so that it copies only what we need for each
5041 				 * syscall, like what happens when we use
5042 				 * syscalls:sys_enter_NAME, so that we reduce
5043 				 * the kernel/userspace traffic to just what is
5044 				 * needed for each syscall.
5045 				 */
5046 				if (trace.raw_augmented_syscalls)
5047 					trace.raw_augmented_syscalls_args_size = (6 + 1) * sizeof(long) + sc->id.offset;
5048 				perf_evsel__init_augmented_syscall_tp_ret(evsel);
5049 				evsel->handler = trace__sys_exit;
5050 			}
5051 		}
5052 	}
5053 
5054 	if ((argc >= 1) && (strcmp(argv[0], "record") == 0))
5055 		return trace__record(&trace, argc-1, &argv[1]);
5056 
5057 	/* Using just --errno-summary will trigger --summary */
5058 	if (trace.errno_summary && !trace.summary && !trace.summary_only)
5059 		trace.summary_only = true;
5060 
5061 	/* summary_only implies summary option, but don't overwrite summary if set */
5062 	if (trace.summary_only)
5063 		trace.summary = trace.summary_only;
5064 
5065 	if (output_name != NULL) {
5066 		err = trace__open_output(&trace, output_name);
5067 		if (err < 0) {
5068 			perror("failed to create output file");
5069 			goto out;
5070 		}
5071 	}
5072 
5073 	err = evswitch__init(&trace.evswitch, trace.evlist, stderr);
5074 	if (err)
5075 		goto out_close;
5076 
5077 	err = target__validate(&trace.opts.target);
5078 	if (err) {
5079 		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
5080 		fprintf(trace.output, "%s", bf);
5081 		goto out_close;
5082 	}
5083 
5084 	err = target__parse_uid(&trace.opts.target);
5085 	if (err) {
5086 		target__strerror(&trace.opts.target, err, bf, sizeof(bf));
5087 		fprintf(trace.output, "%s", bf);
5088 		goto out_close;
5089 	}
5090 
5091 	if (!argc && target__none(&trace.opts.target))
5092 		trace.opts.target.system_wide = true;
5093 
5094 	if (input_name)
5095 		err = trace__replay(&trace);
5096 	else
5097 		err = trace__run(&trace, argc, argv);
5098 
5099 out_close:
5100 	if (output_name != NULL)
5101 		fclose(trace.output);
5102 out:
5103 	zfree(&trace.perfconfig_events);
5104 	return err;
5105 }
5106