arch/arm64/include/asm/kasan.h

   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