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