arch/powerpc/tools/relocs_check.sh

   1 #!/bin/sh
   2
   3 # Copyright © 2015 IBM Corporation
   4
   5 # This program is free software; you can redistribute it and/or
   6 # modify it under the terms of the GNU General Public License
   7 # as published by the Free Software Foundation; either version
   8 # 2 of the License, or (at your option) any later version.
   9
  10 # This script checks the relocations of a vmlinux for "suspicious"
  11 # relocations.
  12
  13 # based on relocs_check.pl
  14 # Copyright © 2009 IBM Corporation
  15
  16 if [ $# -lt 2 ]; then
  17         echo "$0 [path to objdump] [path to vmlinux]" 1>&2
  18         exit 1
  19 fi
  20
  21 # Have Kbuild supply the path to objdump so we handle cross compilation.
  22 objdump="$1"
  23 vmlinux="$2"
  24
  25 bad_relocs=$(
  26 $objdump -R "$vmlinux" |
  27         # Only look at relocation lines.
  28         grep -E '\<R_' |
  29         # These relocations are okay
  30         # On PPC64:
  31         #       R_PPC64_RELATIVE, R_PPC64_NONE
  32         #       R_PPC64_ADDR64 mach_<name>
  33         #       R_PPC64_ADDR64 __crc_<name>
  34         # On PPC:
  35         #       R_PPC_RELATIVE, R_PPC_ADDR16_HI,
  36         #       R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
  37         #       R_PPC_NONE
  38         grep -F -w -v 'R_PPC64_RELATIVE
  39 R_PPC64_NONE
  40 R_PPC_ADDR16_LO
  41 R_PPC_ADDR16_HI
  42 R_PPC_ADDR16_HA
  43 R_PPC_RELATIVE
  44 R_PPC_NONE' |
  45         grep -E -v '\<R_PPC64_ADDR64[[:space:]]+mach_' |
  46         grep -E -v '\<R_PPC64_ADDR64[[:space:]]+__crc_'
  47 )
  48
  49 if [ -z "$bad_relocs" ]; then
  50         exit 0
  51 fi
  52
  53 num_bad=$(echo "$bad_relocs" | wc -l)
  54 echo "WARNING: $num_bad bad relocations"
  55 echo "$bad_relocs"
  56
  57 # If we see this type of relocation it's an idication that
  58 # we /may/ be using an old version of binutils.
  59 if echo "$bad_relocs" | grep -q -F -w R_PPC64_UADDR64; then
  60         echo "WARNING: You need at least binutils >= 2.19 to build a CONFIG_RELOCATABLE kernel"
  61 fi