Lines Matching +full:tf +full:- +full:a
1 // SPDX-License-Identifier: GPL-2.0
3 * Fprobe-based tracing events
54 return ev->ops == &trace_fprobe_ops; in is_trace_fprobe()
63 * for_each_trace_fprobe - iterate over the trace_fprobe list
65 * @dpos: the struct dyn_event * to use as a loop cursor
71 static bool trace_fprobe_is_return(struct trace_fprobe *tf) in trace_fprobe_is_return() argument
73 return tf->fp.exit_handler != NULL; in trace_fprobe_is_return()
76 static bool trace_fprobe_is_tracepoint(struct trace_fprobe *tf) in trace_fprobe_is_tracepoint() argument
78 return tf->tpoint != NULL; in trace_fprobe_is_tracepoint()
81 static const char *trace_fprobe_symbol(struct trace_fprobe *tf) in trace_fprobe_symbol() argument
83 return tf->symbol ? tf->symbol : "unknown"; in trace_fprobe_symbol()
88 struct trace_fprobe *tf = to_trace_fprobe(ev); in trace_fprobe_is_busy() local
90 return trace_probe_is_enabled(&tf->tp); in trace_fprobe_is_busy()
93 static bool trace_fprobe_match_command_head(struct trace_fprobe *tf, in trace_fprobe_match_command_head() argument
101 snprintf(buf, sizeof(buf), "%s", trace_fprobe_symbol(tf)); in trace_fprobe_match_command_head()
104 argc--; argv++; in trace_fprobe_match_command_head()
106 return trace_probe_match_command_args(&tf->tp, argc, argv); in trace_fprobe_match_command_head()
112 struct trace_fprobe *tf = to_trace_fprobe(ev); in trace_fprobe_match() local
114 if (event[0] != '\0' && strcmp(trace_probe_name(&tf->tp), event)) in trace_fprobe_match()
117 if (system && strcmp(trace_probe_group_name(&tf->tp), system)) in trace_fprobe_match()
120 return trace_fprobe_match_command_head(tf, argc, argv); in trace_fprobe_match()
123 static bool trace_fprobe_is_registered(struct trace_fprobe *tf) in trace_fprobe_is_registered() argument
125 return fprobe_is_registered(&tf->fp); in trace_fprobe_is_registered()
142 switch (code->op) { in process_fetch_insn()
144 val = regs_get_kernel_stack_nth(regs, code->param); in process_fetch_insn()
154 val = regs_get_kernel_argument(regs, code->param); in process_fetch_insn()
157 val = *(unsigned long *)((unsigned long)edata + code->offset); in process_fetch_insn()
160 case FETCH_NOP_SYMBOL: /* Ignore a place holder */ in process_fetch_insn()
176 __fentry_trace_func(struct trace_fprobe *tf, unsigned long entry_ip, in NOKPROBE_SYMBOL()
181 struct trace_event_call *call = trace_probe_event_call(&tf->tp); in NOKPROBE_SYMBOL()
185 if (WARN_ON_ONCE(call != trace_file->event_call)) in NOKPROBE_SYMBOL()
191 dsize = __get_data_size(&tf->tp, regs, NULL); in NOKPROBE_SYMBOL()
194 sizeof(*entry) + tf->tp.size + dsize); in NOKPROBE_SYMBOL()
200 entry->ip = entry_ip; in NOKPROBE_SYMBOL()
201 store_trace_args(&entry[1], &tf->tp, regs, NULL, sizeof(*entry), dsize); in NOKPROBE_SYMBOL()
207 fentry_trace_func(struct trace_fprobe *tf, unsigned long entry_ip, in fentry_trace_func() argument
212 trace_probe_for_each_link_rcu(link, &tf->tp) in fentry_trace_func()
213 __fentry_trace_func(tf, entry_ip, regs, link->file); in fentry_trace_func()
222 struct trace_fprobe *tf = container_of(fp, struct trace_fprobe, fp); in trace_fprobe_entry_handler() local
224 if (tf->tp.entry_arg) in trace_fprobe_entry_handler()
225 store_trace_entry_data(entry_data, &tf->tp, regs); in trace_fprobe_entry_handler()
232 __fexit_trace_func(struct trace_fprobe *tf, unsigned long entry_ip, in NOKPROBE_SYMBOL()
238 struct trace_event_call *call = trace_probe_event_call(&tf->tp); in NOKPROBE_SYMBOL()
241 if (WARN_ON_ONCE(call != trace_file->event_call)) in NOKPROBE_SYMBOL()
247 dsize = __get_data_size(&tf->tp, regs, entry_data); in NOKPROBE_SYMBOL()
250 sizeof(*entry) + tf->tp.size + dsize); in NOKPROBE_SYMBOL()
256 entry->func = entry_ip; in NOKPROBE_SYMBOL()
257 entry->ret_ip = ret_ip; in NOKPROBE_SYMBOL()
258 store_trace_args(&entry[1], &tf->tp, regs, entry_data, sizeof(*entry), dsize); in NOKPROBE_SYMBOL()
264 fexit_trace_func(struct trace_fprobe *tf, unsigned long entry_ip, in fexit_trace_func() argument
269 trace_probe_for_each_link_rcu(link, &tf->tp) in fexit_trace_func()
270 __fexit_trace_func(tf, entry_ip, ret_ip, regs, entry_data, link->file); in fexit_trace_func()
276 static int fentry_perf_func(struct trace_fprobe *tf, unsigned long entry_ip, in fentry_perf_func() argument
279 struct trace_event_call *call = trace_probe_event_call(&tf->tp); in fentry_perf_func()
285 head = this_cpu_ptr(call->perf_events); in fentry_perf_func()
289 dsize = __get_data_size(&tf->tp, regs, NULL); in fentry_perf_func()
290 __size = sizeof(*entry) + tf->tp.size + dsize; in fentry_perf_func()
292 size -= sizeof(u32); in fentry_perf_func()
298 entry->ip = entry_ip; in fentry_perf_func()
300 store_trace_args(&entry[1], &tf->tp, regs, NULL, sizeof(*entry), dsize); in fentry_perf_func()
301 perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, in fentry_perf_func()
308 fexit_perf_func(struct trace_fprobe *tf, unsigned long entry_ip, in fexit_perf_func() argument
312 struct trace_event_call *call = trace_probe_event_call(&tf->tp); in fexit_perf_func()
318 head = this_cpu_ptr(call->perf_events); in fexit_perf_func()
322 dsize = __get_data_size(&tf->tp, regs, entry_data); in fexit_perf_func()
323 __size = sizeof(*entry) + tf->tp.size + dsize; in fexit_perf_func()
325 size -= sizeof(u32); in fexit_perf_func()
331 entry->func = entry_ip; in fexit_perf_func()
332 entry->ret_ip = ret_ip; in fexit_perf_func()
333 store_trace_args(&entry[1], &tf->tp, regs, entry_data, sizeof(*entry), dsize); in fexit_perf_func()
334 perf_trace_buf_submit(entry, size, rctx, call->event.type, 1, regs, in fexit_perf_func()
344 struct trace_fprobe *tf = container_of(fp, struct trace_fprobe, fp); in fentry_dispatcher() local
347 if (trace_probe_test_flag(&tf->tp, TP_FLAG_TRACE)) in fentry_dispatcher()
348 fentry_trace_func(tf, entry_ip, regs); in fentry_dispatcher()
350 if (trace_probe_test_flag(&tf->tp, TP_FLAG_PROFILE)) in fentry_dispatcher()
351 ret = fentry_perf_func(tf, entry_ip, regs); in fentry_dispatcher()
361 struct trace_fprobe *tf = container_of(fp, struct trace_fprobe, fp); in fexit_dispatcher() local
363 if (trace_probe_test_flag(&tf->tp, TP_FLAG_TRACE)) in fexit_dispatcher()
364 fexit_trace_func(tf, entry_ip, ret_ip, regs, entry_data); in fexit_dispatcher()
366 if (trace_probe_test_flag(&tf->tp, TP_FLAG_PROFILE)) in fexit_dispatcher()
367 fexit_perf_func(tf, entry_ip, ret_ip, regs, entry_data); in fexit_dispatcher()
372 static void free_trace_fprobe(struct trace_fprobe *tf) in free_trace_fprobe() argument
374 if (tf) { in free_trace_fprobe()
375 trace_probe_cleanup(&tf->tp); in free_trace_fprobe()
376 kfree(tf->symbol); in free_trace_fprobe()
377 kfree(tf); in free_trace_fprobe()
391 struct trace_fprobe *tf; in alloc_trace_fprobe() local
392 int ret = -ENOMEM; in alloc_trace_fprobe()
394 tf = kzalloc(struct_size(tf, tp.args, nargs), GFP_KERNEL); in alloc_trace_fprobe()
395 if (!tf) in alloc_trace_fprobe()
398 tf->symbol = kstrdup(symbol, GFP_KERNEL); in alloc_trace_fprobe()
399 if (!tf->symbol) in alloc_trace_fprobe()
403 tf->fp.exit_handler = fexit_dispatcher; in alloc_trace_fprobe()
405 tf->fp.entry_handler = fentry_dispatcher; in alloc_trace_fprobe()
407 tf->tpoint = tpoint; in alloc_trace_fprobe()
408 tf->fp.nr_maxactive = maxactive; in alloc_trace_fprobe()
410 ret = trace_probe_init(&tf->tp, event, group, false, nargs); in alloc_trace_fprobe()
414 dyn_event_init(&tf->devent, &trace_fprobe_ops); in alloc_trace_fprobe()
415 return tf; in alloc_trace_fprobe()
417 free_trace_fprobe(tf); in alloc_trace_fprobe()
425 struct trace_fprobe *tf; in find_trace_fprobe() local
427 for_each_trace_fprobe(tf, pos) in find_trace_fprobe()
428 if (strcmp(trace_probe_name(&tf->tp), event) == 0 && in find_trace_fprobe()
429 strcmp(trace_probe_group_name(&tf->tp), group) == 0) in find_trace_fprobe()
430 return tf; in find_trace_fprobe()
434 static inline int __enable_trace_fprobe(struct trace_fprobe *tf) in __enable_trace_fprobe() argument
436 if (trace_fprobe_is_registered(tf)) in __enable_trace_fprobe()
437 enable_fprobe(&tf->fp); in __enable_trace_fprobe()
444 struct trace_fprobe *tf; in __disable_trace_fprobe() local
446 list_for_each_entry(tf, trace_probe_probe_list(tp), tp.list) { in __disable_trace_fprobe()
447 if (!trace_fprobe_is_registered(tf)) in __disable_trace_fprobe()
449 disable_fprobe(&tf->fp); in __disable_trace_fprobe()
461 struct trace_fprobe *tf; in enable_trace_fprobe() local
467 return -ENODEV; in enable_trace_fprobe()
479 list_for_each_entry(tf, trace_probe_probe_list(tp), tp.list) { in enable_trace_fprobe()
481 __enable_trace_fprobe(tf); in enable_trace_fprobe()
499 return -ENODEV; in disable_trace_fprobe()
503 return -ENOENT; in disable_trace_fprobe()
532 struct trace_seq *s = &iter->seq; in print_fentry_event()
535 field = (struct fentry_trace_entry_head *)iter->ent; in print_fentry_event()
543 if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET)) in print_fentry_event()
548 if (trace_probe_print_args(s, tp->args, tp->nr_args, in print_fentry_event()
562 struct trace_seq *s = &iter->seq; in print_fexit_event()
565 field = (struct fexit_trace_entry_head *)iter->ent; in print_fexit_event()
573 if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET)) in print_fexit_event()
576 trace_seq_puts(s, " <- "); in print_fexit_event()
578 if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET)) in print_fexit_event()
583 if (trace_probe_print_args(s, tp->args, tp->nr_args, in print_fexit_event()
601 return -ENOENT; in fentry_event_define_fields()
616 return -ENOENT; in fexit_event_define_fields()
647 static inline void init_trace_event_call(struct trace_fprobe *tf) in init_trace_event_call() argument
649 struct trace_event_call *call = trace_probe_event_call(&tf->tp); in init_trace_event_call()
651 if (trace_fprobe_is_return(tf)) { in init_trace_event_call()
652 call->event.funcs = &fexit_funcs; in init_trace_event_call()
653 call->class->fields_array = fexit_fields_array; in init_trace_event_call()
655 call->event.funcs = &fentry_funcs; in init_trace_event_call()
656 call->class->fields_array = fentry_fields_array; in init_trace_event_call()
659 call->flags = TRACE_EVENT_FL_FPROBE; in init_trace_event_call()
660 call->class->reg = fprobe_register; in init_trace_event_call()
663 static int register_fprobe_event(struct trace_fprobe *tf) in register_fprobe_event() argument
665 init_trace_event_call(tf); in register_fprobe_event()
667 return trace_probe_register_event_call(&tf->tp); in register_fprobe_event()
670 static int unregister_fprobe_event(struct trace_fprobe *tf) in unregister_fprobe_event() argument
672 return trace_probe_unregister_event_call(&tf->tp); in unregister_fprobe_event()
675 /* Internal register function - just handle fprobe and flags */
676 static int __register_trace_fprobe(struct trace_fprobe *tf) in __register_trace_fprobe() argument
685 if (trace_fprobe_is_registered(tf)) in __register_trace_fprobe()
686 return -EINVAL; in __register_trace_fprobe()
688 for (i = 0; i < tf->tp.nr_args; i++) { in __register_trace_fprobe()
689 ret = traceprobe_update_arg(&tf->tp.args[i]); in __register_trace_fprobe()
694 /* Set/clear disabled flag according to tp->flag */ in __register_trace_fprobe()
695 if (trace_probe_is_enabled(&tf->tp)) in __register_trace_fprobe()
696 tf->fp.flags &= ~FPROBE_FL_DISABLED; in __register_trace_fprobe()
698 tf->fp.flags |= FPROBE_FL_DISABLED; in __register_trace_fprobe()
700 if (trace_fprobe_is_tracepoint(tf)) { in __register_trace_fprobe()
701 struct tracepoint *tpoint = tf->tpoint; in __register_trace_fprobe()
702 unsigned long ip = (unsigned long)tpoint->probestub; in __register_trace_fprobe()
704 * Here, we do 2 steps to enable fprobe on a tracepoint. in __register_trace_fprobe()
706 * and put a fprobe on the stub function. in __register_trace_fprobe()
709 tpoint->probestub, NULL, 0); in __register_trace_fprobe()
712 return register_fprobe_ips(&tf->fp, &ip, 1); in __register_trace_fprobe()
716 return register_fprobe(&tf->fp, tf->symbol, NULL); in __register_trace_fprobe()
719 /* Internal unregister function - just handle fprobe and flags */
720 static void __unregister_trace_fprobe(struct trace_fprobe *tf) in __unregister_trace_fprobe() argument
722 if (trace_fprobe_is_registered(tf)) { in __unregister_trace_fprobe()
723 unregister_fprobe(&tf->fp); in __unregister_trace_fprobe()
724 memset(&tf->fp, 0, sizeof(tf->fp)); in __unregister_trace_fprobe()
725 if (trace_fprobe_is_tracepoint(tf)) { in __unregister_trace_fprobe()
726 tracepoint_probe_unregister(tf->tpoint, in __unregister_trace_fprobe()
727 tf->tpoint->probestub, NULL); in __unregister_trace_fprobe()
728 tf->tpoint = NULL; in __unregister_trace_fprobe()
729 tf->mod = NULL; in __unregister_trace_fprobe()
735 /* Unregister a trace_probe and probe_event */
736 static int unregister_trace_fprobe(struct trace_fprobe *tf) in unregister_trace_fprobe() argument
739 if (trace_probe_has_sibling(&tf->tp)) in unregister_trace_fprobe()
743 if (trace_probe_is_enabled(&tf->tp)) in unregister_trace_fprobe()
744 return -EBUSY; in unregister_trace_fprobe()
746 /* If there's a reference to the dynamic event */ in unregister_trace_fprobe()
747 if (trace_event_dyn_busy(trace_probe_event_call(&tf->tp))) in unregister_trace_fprobe()
748 return -EBUSY; in unregister_trace_fprobe()
751 if (unregister_fprobe_event(tf)) in unregister_trace_fprobe()
752 return -EBUSY; in unregister_trace_fprobe()
755 __unregister_trace_fprobe(tf); in unregister_trace_fprobe()
756 dyn_event_remove(&tf->devent); in unregister_trace_fprobe()
757 trace_probe_unlink(&tf->tp); in unregister_trace_fprobe()
765 struct trace_probe_event *tpe = orig->tp.event; in trace_fprobe_has_same_fprobe()
768 list_for_each_entry(orig, &tpe->probes, tp.list) { in trace_fprobe_has_same_fprobe()
777 for (i = 0; i < orig->tp.nr_args; i++) { in trace_fprobe_has_same_fprobe()
778 if (strcmp(orig->tp.args[i].comm, in trace_fprobe_has_same_fprobe()
779 comp->tp.args[i].comm)) in trace_fprobe_has_same_fprobe()
783 if (i == orig->tp.nr_args) in trace_fprobe_has_same_fprobe()
790 static int append_trace_fprobe(struct trace_fprobe *tf, struct trace_fprobe *to) in append_trace_fprobe() argument
794 if (trace_fprobe_is_return(tf) != trace_fprobe_is_return(to) || in append_trace_fprobe()
795 trace_fprobe_is_tracepoint(tf) != trace_fprobe_is_tracepoint(to)) { in append_trace_fprobe()
798 return -EEXIST; in append_trace_fprobe()
800 ret = trace_probe_compare_arg_type(&tf->tp, &to->tp); in append_trace_fprobe()
805 return -EEXIST; in append_trace_fprobe()
807 if (trace_fprobe_has_same_fprobe(to, tf)) { in append_trace_fprobe()
810 return -EEXIST; in append_trace_fprobe()
814 ret = trace_probe_append(&tf->tp, &to->tp); in append_trace_fprobe()
818 ret = __register_trace_fprobe(tf); in append_trace_fprobe()
820 trace_probe_unlink(&tf->tp); in append_trace_fprobe()
822 dyn_event_add(&tf->devent, trace_probe_event_call(&tf->tp)); in append_trace_fprobe()
827 /* Register a trace_probe and probe_event */
828 static int register_trace_fprobe(struct trace_fprobe *tf) in register_trace_fprobe() argument
835 old_tf = find_trace_fprobe(trace_probe_name(&tf->tp), in register_trace_fprobe()
836 trace_probe_group_name(&tf->tp)); in register_trace_fprobe()
838 ret = append_trace_fprobe(tf, old_tf); in register_trace_fprobe()
843 ret = register_fprobe_event(tf); in register_trace_fprobe()
845 if (ret == -EEXIST) { in register_trace_fprobe()
854 ret = __register_trace_fprobe(tf); in register_trace_fprobe()
856 unregister_fprobe_event(tf); in register_trace_fprobe()
858 dyn_event_add(&tf->devent, trace_probe_event_call(&tf->tp)); in register_trace_fprobe()
870 struct trace_fprobe *tf; in __tracepoint_probe_module_cb() local
877 for_each_trace_fprobe(tf, pos) { in __tracepoint_probe_module_cb()
878 if (tp_mod->mod == tf->mod) { in __tracepoint_probe_module_cb()
879 tracepoint_probe_unregister(tf->tpoint, in __tracepoint_probe_module_cb()
880 tf->tpoint->probestub, NULL); in __tracepoint_probe_module_cb()
881 tf->tpoint = NULL; in __tracepoint_probe_module_cb()
882 tf->mod = NULL; in __tracepoint_probe_module_cb()
904 if (!data->tpoint && !strcmp(data->tp_name, tp->name)) in __find_tracepoint_cb()
905 data->tpoint = tp; in __find_tracepoint_cb()
927 int len = tmp - argv[1]; in parse_symbol_and_return()
933 return -EINVAL; in parse_symbol_and_return()
939 return -ENOMEM; in parse_symbol_and_return()
944 /* If there is $retval, this should be a return fprobe. */ in parse_symbol_and_return()
950 trace_probe_log_err(tmp - argv[i], RETVAL_ON_PROBE); in parse_symbol_and_return()
953 return -EINVAL; in parse_symbol_and_return()
966 * - Add fentry probe: in __trace_fprobe_create()
968 * - Add fexit probe: in __trace_fprobe_create()
970 * - Add tracepoint probe: in __trace_fprobe_create()
976 * $stackN : fetch Nth entry of stack (N:0-) in __trace_fprobe_create()
977 * $argN : fetch Nth argument (N:1-) in __trace_fprobe_create()
980 * @SYM[+|-offs] : fetch memory at SYM +|- offs (SYM is a data symbol) in __trace_fprobe_create()
982 * +|-offs(ARG) : fetch memory at ARG +|- offs address. in __trace_fprobe_create()
988 struct trace_fprobe *tf = NULL; in __trace_fprobe_create() local
1006 return -ECANCELED; in __trace_fprobe_create()
1021 len = event - &argv[0][1] - 1; in __trace_fprobe_create()
1024 if (len > MAX_EVENT_NAME_LEN - 1) { in __trace_fprobe_create()
1035 /* fprobe rethook instances are iterated over via a list. The in __trace_fprobe_create()
1046 /* a symbol(or tracepoint) must be specified */ in __trace_fprobe_create()
1060 event - argv[0]); in __trace_fprobe_create()
1066 /* Make a new event name */ in __trace_fprobe_create()
1091 (unsigned long)tpoint->probestub, in __trace_fprobe_create()
1096 argc -= 2; argv += 2; in __trace_fprobe_create()
1109 ret = -E2BIG; in __trace_fprobe_create()
1113 /* setup a probe */ in __trace_fprobe_create()
1114 tf = alloc_trace_fprobe(group, event, symbol, tpoint, maxactive, in __trace_fprobe_create()
1116 if (IS_ERR(tf)) { in __trace_fprobe_create()
1117 ret = PTR_ERR(tf); in __trace_fprobe_create()
1118 /* This must return -ENOMEM, else there is a bug */ in __trace_fprobe_create()
1119 WARN_ON_ONCE(ret != -ENOMEM); in __trace_fprobe_create()
1120 goto out; /* We know tf is not allocated */ in __trace_fprobe_create()
1124 tf->mod = __module_text_address( in __trace_fprobe_create()
1125 (unsigned long)tf->tpoint->probestub); in __trace_fprobe_create()
1131 ret = traceprobe_parse_probe_arg(&tf->tp, i, argv[i], &ctx); in __trace_fprobe_create()
1133 goto error; /* This can be -ENOMEM */ in __trace_fprobe_create()
1136 if (is_return && tf->tp.entry_arg) { in __trace_fprobe_create()
1137 tf->fp.entry_handler = trace_fprobe_entry_handler; in __trace_fprobe_create()
1138 tf->fp.entry_data_size = traceprobe_get_entry_data_size(&tf->tp); in __trace_fprobe_create()
1141 ret = traceprobe_set_print_fmt(&tf->tp, in __trace_fprobe_create()
1146 ret = register_trace_fprobe(tf); in __trace_fprobe_create()
1149 if (ret == -EILSEQ) in __trace_fprobe_create()
1151 else if (ret == -ENOENT) in __trace_fprobe_create()
1153 else if (ret != -ENOMEM && ret != -EEXIST) in __trace_fprobe_create()
1166 ret = -EINVAL; in __trace_fprobe_create()
1168 free_trace_fprobe(tf); in __trace_fprobe_create()
1179 struct trace_fprobe *tf = to_trace_fprobe(ev); in trace_fprobe_release() local
1180 int ret = unregister_trace_fprobe(tf); in trace_fprobe_release()
1183 free_trace_fprobe(tf); in trace_fprobe_release()
1189 struct trace_fprobe *tf = to_trace_fprobe(ev); in trace_fprobe_show() local
1192 if (trace_fprobe_is_tracepoint(tf)) in trace_fprobe_show()
1196 if (trace_fprobe_is_return(tf) && tf->fp.nr_maxactive) in trace_fprobe_show()
1197 seq_printf(m, "%d", tf->fp.nr_maxactive); in trace_fprobe_show()
1198 seq_printf(m, ":%s/%s", trace_probe_group_name(&tf->tp), in trace_fprobe_show()
1199 trace_probe_name(&tf->tp)); in trace_fprobe_show()
1201 seq_printf(m, " %s%s", trace_fprobe_symbol(tf), in trace_fprobe_show()
1202 trace_fprobe_is_return(tf) ? "%return" : ""); in trace_fprobe_show()
1204 for (i = 0; i < tf->tp.nr_args; i++) in trace_fprobe_show()
1205 seq_printf(m, " %s=%s", tf->tp.args[i].name, tf->tp.args[i].comm); in trace_fprobe_show()