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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Clang Control Flow Integrity (CFI) support.
4 *
5 * Copyright (C) 2022 Google LLC
6 */
7#ifndef _LINUX_CFI_H
8#define _LINUX_CFI_H
9
10#include <linux/bug.h>
11#include <linux/module.h>
12
13#ifdef CONFIG_CFI_CLANG
14enum bug_trap_type report_cfi_failure(struct pt_regs *regs, unsigned long addr,
15 unsigned long *target, u32 type);
16
17static inline enum bug_trap_type report_cfi_failure_noaddr(struct pt_regs *regs,
18 unsigned long addr)
19{
20 return report_cfi_failure(regs, addr, NULL, 0);
21}
22
23#ifdef CONFIG_ARCH_USES_CFI_TRAPS
24bool is_cfi_trap(unsigned long addr);
25#endif
26#endif /* CONFIG_CFI_CLANG */
27
28#ifdef CONFIG_MODULES
29#ifdef CONFIG_ARCH_USES_CFI_TRAPS
30void module_cfi_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,
31 struct module *mod);
32#else
33static inline void module_cfi_finalize(const Elf_Ehdr *hdr,
34 const Elf_Shdr *sechdrs,
35 struct module *mod) {}
36#endif /* CONFIG_ARCH_USES_CFI_TRAPS */
37#endif /* CONFIG_MODULES */
38
39#endif /* _LINUX_CFI_H */