From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
Update fprobe document so that the entry/exit handler uses ftrace_regs
instead of pt_regs.
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
---
Documentation/trace/fprobe.rst | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
diff --git a/Documentation/trace/fprobe.rst b/Documentation/trace/fprobe.rst
index a6d682478147..8eee88eda4e6 100644
--- a/Documentation/trace/fprobe.rst
+++ b/Documentation/trace/fprobe.rst
@@ -91,9 +91,9 @@ The prototype of the entry/exit callback function are as follows:
.. code-block:: c
- int entry_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct pt_regs *regs, void *entry_data);
+ int entry_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data);
- void exit_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct pt_regs *regs, void *entry_data);
+ void exit_callback(struct fprobe *fp, unsigned long entry_ip, unsigned long ret_ip, struct ftrace_regs *fregs, void *entry_data);
Note that the @entry_ip is saved at function entry and passed to exit handler.
If the entry callback function returns !0, the corresponding exit callback will be cancelled.
@@ -112,12 +112,10 @@ If the entry callback function returns !0, the corresponding exit callback will
This is the return address of the traced function. This can be used
at both entry and exit.
-@regs
- This is the `pt_regs` data structure at the entry and exit. Note that
- the instruction pointer of @regs may be different from the @entry_ip
- in the entry_handler. If you need traced instruction pointer, you need
- to use @entry_ip. On the other hand, in the exit_handler, the instruction
- pointer of @regs is set to the currect return address.
+@fregs
+ This is the `ftrace_regs` data structure at the entry and exit. Note that
+ the instruction pointer of @fregs may be incorrect in entry handler and
+ exit handler, so you have to use @entry_ip and @ret_ip instead.
@entry_data
This is a local storage to share the data between entry and exit handlers.
