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Add rethook arm implementation. Most of the code has been copied from kretprobes on arm. Since the arm's ftrace implementation is a bit special, this needs a special care using from fprobe. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Tested-by: Steven Rostedt (Google) <rostedt@goodmis.org> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/164735289643.1084943.15184590256680485720.stgit@devnote2