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 __ASSEMBLY__
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 #ifdef CONFIG_PPC_BOOK3S_64
57 DECLARE_STATIC_KEY_FALSE(powerpc_kasan_enabled_key);
58
59 static __always_inline bool kasan_arch_is_ready(void)
60 {
61 if (static_branch_likely(&powerpc_kasan_enabled_key))
62 return true;
63 return false;
64 }
65
66 #define kasan_arch_is_ready kasan_arch_is_ready
67 #endif
68
69 void kasan_early_init(void);
70 void kasan_mmu_init(void);
71 void kasan_init(void);
72 void kasan_late_init(void);
73 #else
74 static inline void kasan_init(void) { }
75 static inline void kasan_mmu_init(void) { }
76 static inline void kasan_late_init(void) { }
77 #endif
78
79 void kasan_update_early_region(unsigned long k_start, unsigned long k_end, pte_t pte);
80 int kasan_init_shadow_page_tables(unsigned long k_start, unsigned long k_end);
81 int kasan_init_region(void *start, size_t size);
82
83 #endif /* __ASSEMBLY */
84 #endif
85
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