| 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 */ |