/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2020 ARM Ltd. */ #ifndef __ASM_MTE_KASAN_H #define __ASM_MTE_KASAN_H #include <asm/mte-def.h> #ifndef __ASSEMBLY__ #include <linux/types.h> /* * The functions below are meant to be used only for the * KASAN_HW_TAGS interface defined in asm/memory.h. */ #ifdef CONFIG_ARM64_MTE static inline u8 mte_get_ptr_tag(void *ptr) { /* Note: The format of KASAN tags is 0xF<x> */ u8 tag = 0xF0 | (u8)(((u64)(ptr)) >> MTE_TAG_SHIFT); return tag; } u8 mte_get_mem_tag(void *addr); u8 mte_get_random_tag(void); void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag); void mte_enable_kernel(void); void mte_init_tags(u64 max_tag); #else /* CONFIG_ARM64_MTE */ static inline u8 mte_get_ptr_tag(void *ptr) { return 0xFF; } static inline u8 mte_get_mem_tag(void *addr) { return 0xFF; } static inline u8 mte_get_random_tag(void) { return 0xFF; } static inline void *mte_set_mem_tag_range(void *addr, size_t size, u8 tag) { return addr; } static inline void mte_enable_kernel(void) { } static inline void mte_init_tags(u64 max_tag) { } #endif /* CONFIG_ARM64_MTE */ #endif /* __ASSEMBLY__ */ #endif /* __ASM_MTE_KASAN_H */