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>
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index fc6f35f..8f450ad 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -5367,6 +5367,48 @@
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;