powerpc: Add rethook support
Add rethook powerpc64 implementation. Most of the code has been copied from kretprobes on powerpc64. 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/164735288495.1084943.539630613772422267.stgit@devnote2
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