On Wed, Aug 23, 2023 at 5:16 PM Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> wrote: > > From: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> > > Change the fprobe exit handler and rethook to use ftrace_regs data structure > instead of pt_regs. This also introduce HAVE_PT_REGS_TO_FTRACE_REGS_CAST > which means the ftrace_regs's memory layout is equal to the pt_regs so > that those are able to cast. Only if it is enabled, kretprobe will use > rethook since kretprobe requires pt_regs for backward compatibility. > > This means the archs which currently implement rethook for kretprobes needs to > set that flag and it must ensure struct ftrace_regs is same as pt_regs. > If not, it must be either disabling kretprobe or implementing kretprobe > trampoline separately from rethook trampoline. > > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx> Acked-by: Florent Revest <revest@xxxxxxxxxxxx>
