| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ASM_KASAN_H |
| 3 | #define __ASM_KASAN_H |
| 4 | |
| 5 | #ifndef __ASSEMBLY__ |
| 6 | |
| 7 | #include <linux/linkage.h> |
| 8 | #include <asm/memory.h> |
| 9 | #include <asm/pgtable-types.h> |
| 10 | |
| 11 | #define arch_kasan_set_tag(addr, tag) __tag_set(addr, tag) |
| 12 | #define arch_kasan_reset_tag(addr) __tag_reset(addr) |
| 13 | #define arch_kasan_get_tag(addr) __tag_get(addr) |
| 14 | |
| 15 | #ifdef CONFIG_KASAN |
| 16 | |
| 17 | /* |
| 18 | * KASAN_SHADOW_START: beginning of the kernel virtual addresses. |
| 19 | * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses, |
| 20 | * where N = (1 << KASAN_SHADOW_SCALE_SHIFT). |
| 21 | * |
| 22 | * KASAN_SHADOW_OFFSET: |
| 23 | * This value is used to map an address to the corresponding shadow |
| 24 | * address by the following formula: |
| 25 | * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET |
| 26 | * |
| 27 | * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range |
| 28 | * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual |
| 29 | * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation: |
| 30 | * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - |
| 31 | * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT)) |
| 32 | */ |
| 33 | #define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT))) |
| 34 | #define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual) |
| 35 | |
| 36 | void kasan_init(void); |
| 37 | void kasan_copy_shadow(pgd_t *pgdir); |
| 38 | asmlinkage void kasan_early_init(void); |
| 39 | |
| 40 | #else |
| 41 | static inline void kasan_init(void) { } |
| 42 | static inline void kasan_copy_shadow(pgd_t *pgdir) { } |
| 43 | #endif |
| 44 | |
| 45 | #endif |
| 46 | #endif |