arch/powerpc/include/asm/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 __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