kasan.h

 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)	_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 __ASSEMBLER__
16
17#include <asm/page.h>
18#include <linux/sizes.h>
19
20#define KASAN_SHADOW_SCALE_SHIFT	3
21
22#if defined(CONFIG_EXECMEM) && 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
57void kasan_early_init(void);
58void kasan_mmu_init(void);
59void kasan_init(void);
60void kasan_late_init(void);
61#else
62static inline void kasan_init(void) { }
63static inline void kasan_mmu_init(void) { }
64static inline void kasan_late_init(void) { }
65#endif
66
67void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte);
68int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end);
69int kasan_init_region(void *start, size_t size);
70
71#endif /* __ASSEMBLER__ */
72#endif