1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __ASM_KASAN_H 3#define __ASM_KASAN_H 4 5#if defined(CONFIG_KASAN) && !defined(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX) 6#define _GLOBAL_KASAN(fn) _GLOBAL(__##fn) 7#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(__##fn) 8#define EXPORT_SYMBOL_KASAN(fn) EXPORT_SYMBOL(__##fn) 9#else 10#define _GLOBAL_KASAN(fn) _GLOBAL(fn) 11#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(fn) 12#define EXPORT_SYMBOL_KASAN(fn) 13#endif 14 15#ifndef __ASSEMBLY__ 16 17#include <asm/page.h> 18#include <linux/sizes.h> 19 20#define KASAN_SHADOW_SCALE_SHIFT 3 21 22#if defined(CONFIG_MODULES) && defined(CONFIG_PPC32) 23#define KASAN_KERN_START ALIGN_DOWN(PAGE_OFFSET - SZ_256M, SZ_256M) 24#else 25#define KASAN_KERN_START PAGE_OFFSET 26#endif 27 28#define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \ 29 (KASAN_KERN_START >> KASAN_SHADOW_SCALE_SHIFT)) 30 31#define KASAN_SHADOW_OFFSET ASM_CONST(CONFIG_KASAN_SHADOW_OFFSET) 32 33#ifdef CONFIG_PPC32 34#define KASAN_SHADOW_END (-(-KASAN_SHADOW_START >> KASAN_SHADOW_SCALE_SHIFT)) 35#elif defined(CONFIG_PPC_BOOK3S_64) 36/* 37 * The shadow ends before the highest accessible address 38 * because we don't need a shadow for the shadow. Instead: 39 * c00e000000000000 << 3 + a80e000000000000 = c00fc00000000000 40 */ 41#define KASAN_SHADOW_END 0xc00fc00000000000UL 42 43#else 44 45/* 46 * The shadow ends before the highest accessible address 47 * because we don't need a shadow for the shadow. 48 * But it doesn't hurt to have a shadow for the shadow, 49 * keep shadow end aligned eases things. 50 */ 51#define KASAN_SHADOW_END 0xc000200000000000UL 52 53#endif 54 55#ifdef CONFIG_KASAN 56#ifdef CONFIG_PPC_BOOK3S_64 57DECLARE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key); 58 59static __always_inline bool kasan_arch_is_ready(void) 60{ 61 if (static_branch_likely(&powerpc_kasan_enabled_key)) 62 return true; 63 return false; 64} 65 66#define kasan_arch_is_ready kasan_arch_is_ready 67#endif 68 69void kasan_early_init(void); 70void kasan_mmu_init(void); 71void kasan_init(void); 72void kasan_late_init(void); 73#else 74static inline void kasan_init(void) { } 75static inline void kasan_mmu_init(void) { } 76static inline void kasan_late_init(void) { } 77#endif 78 79void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte); 80int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end); 81int kasan_init_region(void *start, size_t size); 82 83#endif /* __ASSEMBLY */ 84#endif 85