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Commit 6d862b8c authored by Steven Rostedt's avatar Steven Rostedt Committed by Arnaldo Carvalho de Melo
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tools lib traceevent: Add pevent_print_func_field() helper function 



Add the pevent_print_func_field() that will look up a field that is
expected to be a function pointer, and it will print the function name
and offset of the address given by the field.

Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20131101215501.869542711@goodmis.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent c6c2b960

tools/lib/traceevent/event-parse.c

+42 −0
Original line number Diff line number Diff line
@@ -5367,6 +5367,48 @@ int pevent_print_num_field(struct trace_seq *s, const char *fmt, 
	return -1;

}



/**

 * pevent_print_func_field - print a field and a format for function pointers

 * @s: The seq to print to

 * @fmt: The printf format to print the field with.

 * @event: the event that the field is for

 * @name: The name of the field

 * @record: The record with the field name.

 * @err: print default error if failed.

 *

 * Returns: 0 on success, -1 field not found, or 1 if buffer is full.

 */

int pevent_print_func_field(struct trace_seq *s, const char *fmt,

			    struct event_format *event, const char *name,

			    struct pevent_record *record, int err)

{

	struct format_field *field = pevent_find_field(event, name);

	struct pevent *pevent = event->pevent;

	unsigned long long val;

	struct func_map *func;

	char tmp[128];



	if (!field)

		goto failed;



	if (pevent_read_number_field(field, record->data, &val))

		goto failed;



	func = find_func(pevent, val);



	if (func)

		snprintf(tmp, 128, "%s/0x%llx", func->func, func->addr - val);

	else

		sprintf(tmp, "0x%08llx", val);



	return trace_seq_printf(s, fmt, tmp);



 failed:

	if (err)

		trace_seq_printf(s, "CAN'T FIND FIELD \"%s\"", name);

	return -1;

}



static void free_func_handle(struct pevent_function_handler *func)

{

	struct pevent_func_params *params;

tools/lib/traceevent/event-parse.h

+4 −0
Original line number Diff line number Diff line
@@ -569,6 +569,10 @@ int pevent_print_num_field(struct trace_seq *s, const char *fmt, 
			   struct event_format *event, const char *name,

			   struct pevent_record *record, int err);



int pevent_print_func_field(struct trace_seq *s, const char *fmt,

			   struct event_format *event, const char *name,

			   struct pevent_record *record, int err);



int pevent_register_event_handler(struct pevent *pevent, int id,

				  const char *sys_name, const char *event_name,

				  pevent_event_handler_func func, void *context);