From: Steven Rostedt <srost...@redhat.com>

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 <rost...@goodmis.org>
---
 tools/lib/traceevent/event-parse.c | 42 ++++++++++++++++++++++++++++++++++++++
 tools/lib/traceevent/event-parse.h |  4 ++++
 2 files changed, 46 insertions(+)

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 @@ 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 dc8539e..8d73d25 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);
-- 
1.8.4.rc3


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