diff --git a/sys/sys/elf_common.h b/sys/sys/elf_common.h
index 2d61e953401a..86ae3f2e3998 100644
--- a/sys/sys/elf_common.h
+++ b/sys/sys/elf_common.h
@@ -785,6 +785,21 @@ typedef struct {
 #define	NT_X86_XSTATE	0x202	/* x86 XSAVE extended state. */
 #define	NT_ARM_VFP	0x400	/* ARM VFP registers */
 
+/* GNU note types. */
+#define	NT_GNU_ABI_TAG		1
+#define	NT_GNU_HWCAP		2
+#define	NT_GNU_BUILD_ID		3
+#define	NT_GNU_GOLD_VERSION	4
+#define	NT_GNU_PROPERTY_TYPE_0	5
+
+#define	GNU_PROPERTY_LOPROC			0xc0000000
+#define	GNU_PROPERTY_HIPROC			0xdfffffff
+
+#define	GNU_PROPERTY_X86_FEATURE_1_AND		0xc0000002
+
+#define	GNU_PROPERTY_X86_FEATURE_1_IBT		0x00000001
+#define	GNU_PROPERTY_X86_FEATURE_1_SHSTK	0x00000002
+
 /* Symbol Binding - ELFNN_ST_BIND - st_info */
 #define	STB_LOCAL	0	/* Local symbol */
 #define	STB_GLOBAL	1	/* Global symbol */