1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_KASAN_H 3 #define __ASM_KASAN_H 4 5 #ifdef CONFIG_KASAN 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 57 DECLARE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key); 58 59 static __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 69 void kasan_early_init(void); 70 void kasan_mmu_init(void); 71 void kasan_init(void); 72 void kasan_late_init(void); 73 #else 74 static inline void kasan_init(void) { } 75 static inline void kasan_mmu_init(void) { } 76 static inline void kasan_late_init(void) { } 77 #endif 78 79 void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte); 80 int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end); 81 int kasan_init_region(void *start, size_t size); 82 83 #endif /* __ASSEMBLY */ 84 #endif 85