1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Clang Control Flow Integrity (CFI) type definitions.
4 */
5#ifndef _LINUX_CFI_TYPES_H
6#define _LINUX_CFI_TYPES_H
7
8#ifdef __ASSEMBLY__
9#include <linux/linkage.h>
10
11#ifdef CONFIG_CFI_CLANG
12/*
13 * Use the __kcfi_typeid_<function> type identifier symbol to
14 * annotate indirectly called assembly functions. The compiler emits
15 * these symbols for all address-taken function declarations in C
16 * code.
17 */
18#ifndef __CFI_TYPE
19#define __CFI_TYPE(name)				\
20	.4byte __kcfi_typeid_##name
21#endif
22
23#define SYM_TYPED_ENTRY(name, linkage, align...)	\
24	linkage(name) ASM_NL				\
25	align ASM_NL					\
26	__CFI_TYPE(name) ASM_NL				\
27	name:
28
29#define SYM_TYPED_START(name, linkage, align...)	\
30	SYM_TYPED_ENTRY(name, linkage, align)
31
32#else /* CONFIG_CFI_CLANG */
33
34#define SYM_TYPED_START(name, linkage, align...)	\
35	SYM_START(name, linkage, align)
36
37#endif /* CONFIG_CFI_CLANG */
38
39#ifndef SYM_TYPED_FUNC_START
40#define SYM_TYPED_FUNC_START(name) 			\
41	SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)
42#endif
43
44#endif /* __ASSEMBLY__ */
45#endif /* _LINUX_CFI_TYPES_H */
46