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| author | Steven Rostedt <srostedt@redhat.com> | 2013-11-01 22:54:00 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-11-04 18:36:49 +0100 |
| commit | 6d862b8c14ba539c7c87ffc77f2e1d6dc9630c4d (patch) | |
| tree | a8acb87cf151aed23aa0f64d2f78567b6eaffc75 /tools | |
| parent | tools lib traceevent: Add flags NOHANDLE and PRINTRAW to individual events (diff) | |
| download | linux-6d862b8c14ba539c7c87ffc77f2e1d6dc9630c4d.tar.xz linux-6d862b8c14ba539c7c87ffc77f2e1d6dc9630c4d.zip | |
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: 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>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/lib/traceevent/event-parse.c | 42 | ||||
| -rw-r--r-- | tools/lib/traceevent/event-parse.h | 4 |
2 files changed, 46 insertions, 0 deletions
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index fc6f35f591f6..8f450adaa9c2 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -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; diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h index dc8539ee9485..8d73d2594f65 100644 --- a/tools/lib/traceevent/event-parse.h +++ b/tools/lib/traceevent/event-parse.h @@ -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); |