1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_RISCV_CFI_H 3 #define _ASM_RISCV_CFI_H 4 5 /* 6 * Clang Control Flow Integrity (CFI) support. 7 * 8 * Copyright (C) 2023 Google LLC 9 */ 10 #include <linux/bug.h> 11 12 struct pt_regs; 13 14 #ifdef CONFIG_CFI_CLANG 15 enum bug_trap_type handle_cfi_failure(struct pt_regs *regs); 16 #define __bpfcall 17 static inline int cfi_get_offset(void) 18 { 19 return 4; 20 } 21 22 #define cfi_get_offset cfi_get_offset 23 extern u32 cfi_bpf_hash; 24 extern u32 cfi_bpf_subprog_hash; 25 extern u32 cfi_get_func_hash(void *func); 26 #else 27 static inline enum bug_trap_type handle_cfi_failure(struct pt_regs *regs) 28 { 29 return BUG_TRAP_TYPE_NONE; 30 } 31 32 #define cfi_bpf_hash 0U 33 #define cfi_bpf_subprog_hash 0U 34 static inline u32 cfi_get_func_hash(void *func) 35 { 36 return 0; 37 } 38 #endif /* CONFIG_CFI_CLANG */ 39 40 #endif /* _ASM_RISCV_CFI_H */ 41