tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
16
17void kasan_init(void);
18
19/*
20 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
21 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
22 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
23 *
24 * KASAN_SHADOW_OFFSET:
25 * This value is used to map an address to the corresponding shadow
26 * address by the following formula:
27 * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
28 *
29 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
30 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
31 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
32 * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
33 * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
34 */
35#define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT)))
36#define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual)
37
38void kasan_copy_shadow(pgd_t *pgdir);
39asmlinkage void kasan_early_init(void);
40
41#else
42static inline void kasan_init(void) { }
43static inline void kasan_copy_shadow(pgd_t *pgdir) { }
44#endif
45
46#endif
47#endif