1*e84e008eSSami Tolvanen /* SPDX-License-Identifier: GPL-2.0 */ 2*e84e008eSSami Tolvanen /* 3*e84e008eSSami Tolvanen * Clang Control Flow Integrity (CFI) type definitions. 4*e84e008eSSami Tolvanen */ 5*e84e008eSSami Tolvanen #ifndef _LINUX_CFI_TYPES_H 6*e84e008eSSami Tolvanen #define _LINUX_CFI_TYPES_H 7*e84e008eSSami Tolvanen 8*e84e008eSSami Tolvanen #ifdef __ASSEMBLY__ 9*e84e008eSSami Tolvanen #include <linux/linkage.h> 10*e84e008eSSami Tolvanen 11*e84e008eSSami Tolvanen #ifdef CONFIG_CFI_CLANG 12*e84e008eSSami Tolvanen /* 13*e84e008eSSami Tolvanen * Use the __kcfi_typeid_<function> type identifier symbol to 14*e84e008eSSami Tolvanen * annotate indirectly called assembly functions. The compiler emits 15*e84e008eSSami Tolvanen * these symbols for all address-taken function declarations in C 16*e84e008eSSami Tolvanen * code. 17*e84e008eSSami Tolvanen */ 18*e84e008eSSami Tolvanen #ifndef __CFI_TYPE 19*e84e008eSSami Tolvanen #define __CFI_TYPE(name) \ 20*e84e008eSSami Tolvanen .4byte __kcfi_typeid_##name 21*e84e008eSSami Tolvanen #endif 22*e84e008eSSami Tolvanen 23*e84e008eSSami Tolvanen #define SYM_TYPED_ENTRY(name, linkage, align...) \ 24*e84e008eSSami Tolvanen linkage(name) ASM_NL \ 25*e84e008eSSami Tolvanen align ASM_NL \ 26*e84e008eSSami Tolvanen __CFI_TYPE(name) ASM_NL \ 27*e84e008eSSami Tolvanen name: 28*e84e008eSSami Tolvanen 29*e84e008eSSami Tolvanen #define SYM_TYPED_START(name, linkage, align...) \ 30*e84e008eSSami Tolvanen SYM_TYPED_ENTRY(name, linkage, align) 31*e84e008eSSami Tolvanen 32*e84e008eSSami Tolvanen #else /* CONFIG_CFI_CLANG */ 33*e84e008eSSami Tolvanen 34*e84e008eSSami Tolvanen #define SYM_TYPED_START(name, linkage, align...) \ 35*e84e008eSSami Tolvanen SYM_START(name, linkage, align) 36*e84e008eSSami Tolvanen 37*e84e008eSSami Tolvanen #endif /* CONFIG_CFI_CLANG */ 38*e84e008eSSami Tolvanen 39*e84e008eSSami Tolvanen #ifndef SYM_TYPED_FUNC_START 40*e84e008eSSami Tolvanen #define SYM_TYPED_FUNC_START(name) \ 41*e84e008eSSami Tolvanen SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN) 42*e84e008eSSami Tolvanen #endif 43*e84e008eSSami Tolvanen 44*e84e008eSSami Tolvanen #endif /* __ASSEMBLY__ */ 45*e84e008eSSami Tolvanen #endif /* _LINUX_CFI_TYPES_H */ 46