UNW_AR_EC 511 arch/ia64/kernel/process.c unw_get_ar(info, UNW_AR_EC, &dst[54]); UNW_AR_EC 1435 arch/ia64/kernel/ptrace.c return unw_access_ar(info, UNW_AR_EC, data, UNW_AR_EC 537 arch/ia64/kernel/unwind.c case UNW_AR_EC: