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tools lib traceevent: Add pevent_print_func_field() helper function

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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: Steven 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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Steven Rostedt 2013-11-01 17:54:00 -04:00 committed by Arnaldo Carvalho de Melo
parent c6c2b960b7
commit 6d862b8c14
2 changed files with 46 additions and 0 deletions
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42
tools/lib/traceevent/event-parse.c
View file

@ -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;

4
tools/lib/traceevent/event-parse.h
View file

@ -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);