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Record trap_arg{0,1,2} for the linux-user signal frame. Raise SIGBUS directly from cpu_loop_exit_sigbus, which means we can remove the code for EXCP_UNALIGN in cpu_loop. Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>