Documentation/arm64/kasan-offsets.sh

   1 #!/bin/sh
   2
   3 # Print out the KASAN_SHADOW_OFFSETS required to place the KASAN SHADOW
   4 # start address at the mid-point of the kernel VA space
   5
   6 print_kasan_offset () {
   7         printf "%02d\t" $1
   8         printf "0x%08x00000000\n" $(( (0xffffffff & (-1 << ($1 - 1 - 32))) \
   9                         + (1 << ($1 - 32 - $2)) \
  10                         - (1 << (64 - 32 - $2)) ))
  11 }
  12
  13 echo KASAN_SHADOW_SCALE_SHIFT = 3
  14 printf "VABITS\tKASAN_SHADOW_OFFSET\n"
  15 print_kasan_offset 48 3
  16 print_kasan_offset 47 3
  17 print_kasan_offset 42 3
  18 print_kasan_offset 39 3
  19 print_kasan_offset 36 3
  20 echo
  21 echo KASAN_SHADOW_SCALE_SHIFT = 4
  22 printf "VABITS\tKASAN_SHADOW_OFFSET\n"
  23 print_kasan_offset 48 4
  24 print_kasan_offset 47 4
  25 print_kasan_offset 42 4
  26 print_kasan_offset 39 4
  27 print_kasan_offset 36 4