diff --git a/sys/arm64/include/armreg.h b/sys/arm64/include/armreg.h
--- a/sys/arm64/include/armreg.h
+++ b/sys/arm64/include/armreg.h
@@ -2389,6 +2389,7 @@
 #define	PSR_M_EL1h	0x00000005UL
 #define	PSR_M_EL2t	0x00000008UL
 #define	PSR_M_EL2h	0x00000009UL
+#define	PSR_M_EL_MASK	0x0000000cUL
 #define	PSR_M_64	0x00000000UL
 #define	PSR_M_32	0x00000010UL
 #define	PSR_M_MASK	0x0000000fUL