From b734222edd7402931f2611d9613963ef093d834a Mon Sep 17 00:00:00 2001
From: Ed Maste <emaste@FreeBSD.org>
Date: Tue, 4 Jun 2019 15:44:31 +0000
Subject: [PATCH] elf_common: add GNU note types and NT_GNU_PROPERTY_TYPE_0
 bits

To support Intel CET IBT/Shadow Stack.

Reviewed by:	markj
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
---
 sys/sys/elf_common.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

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 */