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ftrace/x86: Show trampoline call function in enabled_functions

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The file /sys/kernel/debug/tracing/eneabled_functions is used to debug
ftrace function hooks. Add to the output what function is being called
by the trampoline if the arch supports it.

Add support for this feature in x86_64.

Cc: H. Peter Anvin <hpa@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Tested-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-07-03 14:51:36 -04:00 • committed by Steven Rostedt
parent f3bea49115
commit 15d5b02cc5
2 changed files with 106 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

22
kernel/trace/ftrace.c
View file

@ -2952,6 +2952,22 @@ static void t_stop(struct seq_file *m, void *p)
mutex_unlock(&ftrace_lock);
}
void * __weak
arch_ftrace_trampoline_func(struct ftrace_ops *ops, struct dyn_ftrace *rec)
{
return NULL;
}
static void add_trampoline_func(struct seq_file *m, struct ftrace_ops *ops,
struct dyn_ftrace *rec)
{
void *ptr;
ptr = arch_ftrace_trampoline_func(ops, rec);
if (ptr)
seq_printf(m, " ->%pS", ptr);
}
static int t_show(struct seq_file *m, void *v)
{
struct ftrace_iterator *iter = m->private;
@ -2975,19 +2991,21 @@ static int t_show(struct seq_file *m, void *v)
seq_printf(m, "%ps", (void *)rec->ip);
if (iter->flags & FTRACE_ITER_ENABLED) {
struct ftrace_ops *ops = NULL;
seq_printf(m, " (%ld)%s",
ftrace_rec_count(rec),
rec->flags & FTRACE_FL_REGS ? " R" : " ");
if (rec->flags & FTRACE_FL_TRAMP_EN) {
struct ftrace_ops *ops;
ops = ftrace_find_tramp_ops_any(rec);
if (ops)
seq_printf(m, "\ttramp: %pS",
(void *)ops->trampoline);
else
seq_printf(m, "\ttramp: ERROR!");
}
add_trampoline_func(m, ops, rec);
}
seq_printf(m, "\n");