arch/powerpc/tools/unrel_branch_check.sh

   1 # Copyright © 2016 IBM Corporation
   2 #
   3 # This program is free software; you can redistribute it and/or
   4 # modify it under the terms of the GNU General Public License
   5 # as published by the Free Software Foundation; either version
   6 # 2 of the License, or (at your option) any later version.
   7 #
   8 # This script checks the relocations of a vmlinux for "suspicious"
   9 # branches from unrelocated code (head_64.S code).
  10
  11 # Turn this on if you want more debug output:
  12 # set -x
  13
  14 # Have Kbuild supply the path to objdump so we handle cross compilation.
  15 objdump="$1"
  16 vmlinux="$2"
  17
  18 #__end_interrupts should be located within the first 64K
  19
  20 end_intr=0x$(
  21 $objdump -R "$vmlinux" -d --start-address=0xc000000000000000           \
  22                  --stop-address=0xc000000000010000 |
  23 grep '\<__end_interrupts>:' |
  24 awk '{print $1}'
  25 )
  26
  27 BRANCHES=$(
  28 $objdump -R "$vmlinux" -D --start-address=0xc000000000000000           \
  29                 --stop-address=${end_intr} |
  30 grep -e "^c[0-9a-f]*:[[:space:]]*\([0-9a-f][0-9a-f][[:space:]]\)\{4\}[[:space:]]*b" |
  31 grep -v '\<__start_initialization_multiplatform>' |
  32 grep -v -e 'b.\?.\?ctr' |
  33 grep -v -e 'b.\?.\?lr' |
  34 sed 's/://' |
  35 awk '{ print $1 ":" $6 ":0x" $7 ":" $8 " "}'
  36 )
  37
  38 for tuple in $BRANCHES
  39 do
  40         from=`echo $tuple | cut -d':' -f1`
  41         branch=`echo $tuple | cut -d':' -f2`
  42         to=`echo $tuple | cut -d':' -f3 | sed 's/cr[0-7],//'`
  43         sym=`echo $tuple | cut -d':' -f4`
  44
  45         if (( $to > $end_intr ))
  46         then
  47                 if [ -z "$bad_branches" ]; then
  48                         echo "WARNING: Unrelocated relative branches"
  49                         bad_branches="yes"
  50                 fi
  51                 echo "$from $branch-> $to $sym"
  52         fi
  53 done
  54
  55 if [ -z "$bad_branches" ]; then
  56         exit 0
  57 fi