/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_KASAN_H #define __ASM_KASAN_H #ifdef CONFIG_KASAN #define _GLOBAL_KASAN(fn) _GLOBAL(__##fn) #define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(__##fn) #define EXPORT_SYMBOL_KASAN(fn) EXPORT_SYMBOL(__##fn) #else #define _GLOBAL_KASAN(fn) _GLOBAL(fn) #define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(fn) #define EXPORT_SYMBOL_KASAN(fn) #endif #ifndef __ASSEMBLY__ #include <asm/page.h> #include <linux/sizes.h> #define KASAN_SHADOW_SCALE_SHIFT 3 #if defined(CONFIG_MODULES) && defined(CONFIG_PPC32) #define KASAN_KERN_START ALIGN_DOWN(PAGE_OFFSET - SZ_256M, SZ_256M) #else #define KASAN_KERN_START PAGE_OFFSET #endif #define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \ (KASAN_KERN_START >> KASAN_SHADOW_SCALE_SHIFT)) #define KASAN_SHADOW_OFFSET ASM_CONST(CONFIG_KASAN_SHADOW_OFFSET) #ifdef CONFIG_PPC32 #define KASAN_SHADOW_END (-(-KASAN_SHADOW_START >> KASAN_SHADOW_SCALE_SHIFT)) #elif defined(CONFIG_PPC_BOOK3S_64) /* * The shadow ends before the highest accessible address * because we don't need a shadow for the shadow. Instead: * c00e000000000000 << 3 + a80e000000000000 = c00fc00000000000 */ #define KASAN_SHADOW_END 0xc00fc00000000000UL #else /* * The shadow ends before the highest accessible address * because we don't need a shadow for the shadow. * But it doesn't hurt to have a shadow for the shadow, * keep shadow end aligned eases things. */ #define KASAN_SHADOW_END 0xc000200000000000UL #endif #ifdef CONFIG_KASAN #ifdef CONFIG_PPC_BOOK3S_64 DECLARE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key); static __always_inline bool kasan_arch_is_ready(void) { if (static_branch_likely(&powerpc_kasan_enabled_key)) return true; return false; } #define kasan_arch_is_ready kasan_arch_is_ready #endif void kasan_early_init(void); void kasan_mmu_init(void); void kasan_init(void); void kasan_late_init(void); #else static inline void kasan_init(void) { } static inline void kasan_mmu_init(void) { } static inline void kasan_late_init(void) { } #endif void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte); int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end); int kasan_init_region(void *start, size_t size); #endif /* __ASSEMBLY */ #endif