diff options
| author | Masami Hiramatsu <[email protected]> | 2014-10-09 13:01:06 +0000 |
|---|---|---|
| committer | Steven Rostedt <[email protected]> | 2014-11-20 11:42:48 -0500 |
| commit | a017784f1b236cbc42ce83b4345a667c21113481 (patch) | |
| tree | 3ea28f325757811c85ebf655ca953e6eea49cc37 /tools/perf/scripts/python/net_dropmonitor.py | |
| parent | 0af26492d5f5c00a08d52e9f3f3831faead90246 (diff) | |
kprobes/ftrace: Recover original IP if pre_handler doesn't change it
Recover original IP register if the pre_handler doesn't change it.
Since current kprobes doesn't expect that another ftrace handler
may change regs->ip, it sets kprobe.addr + MCOUNT_INSN_SIZE to
regs->ip and returns to ftrace.
This seems wrong behavior since kprobes can recover regs->ip
and safely pass it to another handler.
This adds code which recovers original regs->ip passed from
ftrace right before returning to ftrace, so that another ftrace
user can change regs->ip.
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/net_dropmonitor.py')
0 files changed, 0 insertions, 0 deletions