/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Clang Control Flow Integrity (CFI) support.
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*
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* Copyright (C) 2019 Google LLC
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*/
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#ifndef _LINUX_CFI_H
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#define _LINUX_CFI_H
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#ifdef CONFIG_CFI_CLANG
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typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag);
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/* Compiler-generated function in each module, and the kernel */
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extern void __cfi_check(uint64_t id, void *ptr, void *diag);
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/*
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* Force the compiler to generate a CFI jump table entry for a function
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* and store the jump table address to __cfi_jt_<function>.
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*/
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#define __CFI_ADDRESSABLE(fn) \
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const void* __cfi_jt_ ## fn __visible = (void *)&fn;
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#ifdef CONFIG_CFI_CLANG_SHADOW
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extern void cfi_module_add(struct module *mod, unsigned long base_addr);
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extern void cfi_module_remove(struct module *mod, unsigned long base_addr);
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#else
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static inline void cfi_module_add(struct module *mod, unsigned long base_addr) {}
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static inline void cfi_module_remove(struct module *mod, unsigned long base_addr) {}
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#endif /* CONFIG_CFI_CLANG_SHADOW */
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#else /* !CONFIG_CFI_CLANG */
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#define __CFI_ADDRESSABLE(fn)
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#endif /* CONFIG_CFI_CLANG */
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#endif /* _LINUX_CFI_H */
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