Add rethook for x86 implementation. Most of the code has been copied from
kretprobes on x86.
Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: NSteven Rostedt (Google) <rostedt@goodmis.org>
Tested-by: NSteven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/164735286243.1084943.7477055110527046644.stgit@devnote2