cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cfi.h (1352B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Clang Control Flow Integrity (CFI) support.
      4 *
      5 * Copyright (C) 2021 Google LLC
      6 */
      7#ifndef _LINUX_CFI_H
      8#define _LINUX_CFI_H
      9
     10#ifdef CONFIG_CFI_CLANG
     11typedef void (*cfi_check_fn)(uint64_t id, void *ptr, void *diag);
     12
     13/* Compiler-generated function in each module, and the kernel */
     14extern void __cfi_check(uint64_t id, void *ptr, void *diag);
     15
     16/*
     17 * Force the compiler to generate a CFI jump table entry for a function
     18 * and store the jump table address to __cfi_jt_<function>.
     19 */
     20#define __CFI_ADDRESSABLE(fn, __attr) \
     21	const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
     22
     23#ifdef CONFIG_CFI_CLANG_SHADOW
     24
     25extern void cfi_module_add(struct module *mod, unsigned long base_addr);
     26extern void cfi_module_remove(struct module *mod, unsigned long base_addr);
     27
     28#else
     29
     30static inline void cfi_module_add(struct module *mod, unsigned long base_addr) {}
     31static inline void cfi_module_remove(struct module *mod, unsigned long base_addr) {}
     32
     33#endif /* CONFIG_CFI_CLANG_SHADOW */
     34
     35#else /* !CONFIG_CFI_CLANG */
     36
     37#ifdef CONFIG_X86_KERNEL_IBT
     38
     39#define __CFI_ADDRESSABLE(fn, __attr) \
     40	const void *__cfi_jt_ ## fn __visible __attr = (void *)&fn
     41
     42#endif /* CONFIG_X86_KERNEL_IBT */
     43
     44#endif /* CONFIG_CFI_CLANG */
     45
     46#ifndef __CFI_ADDRESSABLE
     47#define __CFI_ADDRESSABLE(fn, __attr)
     48#endif
     49
     50#endif /* _LINUX_CFI_H */