scripts/relocs_check.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0-or-later
   3
   4 # Get a list of all the relocations, remove from it the relocations
   5 # that are known to be legitimate and return this list to arch specific
   6 # script that will look for suspicious relocations.
   7
   8 objdump="$1"
   9 nm="$2"
  10 vmlinux="$3"
  11
  12 # Remove from the possible bad relocations those that match an undefined
  13 # weak symbol which will result in an absolute relocation to 0.
  14 # Weak unresolved symbols are of that form in nm output:
  15 # "                  w _binary__btf_vmlinux_bin_end"
  16 undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }')
  17
  18 $objdump -R "$vmlinux" |
  19         grep -E '\<R_' |
  20         ([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat)