Hi All, I was studying the i386/entry.S file for 2.6.20 kernel. In this file each interrupt handler starts with " CFI_STARTPROC simple CFI_SIGNAL_FRAME CFI_DEF_CFA esp, 0 CFI_REGISTER esp, ebp" Some thing like above. Can any one provide me information about these macros. Thanks, nandac -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ