relocs_check.sh
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#!/bin/sh
# Copyright © 2015 IBM Corporation
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version
# 2 of the License, or (at your option) any later version.
# This script checks the relocations of a vmlinux for "suspicious"
# relocations.
# based on relocs_check.pl
# Copyright © 2009 IBM Corporation
if [ $# -lt 2 ]; then
echo "$0 [path to objdump] [path to vmlinux]" 1>&2
exit 1
fi
# Have Kbuild supply the path to objdump so we handle cross compilation.
objdump="$1"
vmlinux="$2"
bad_relocs=$(
"$objdump" -R "$vmlinux" |
# Only look at relocation lines.
grep -E '\<R_' |
# These relocations are okay
# On PPC64:
# R_PPC64_RELATIVE, R_PPC64_NONE
# R_PPC64_ADDR64 mach_<name>
# On PPC:
# R_PPC_RELATIVE, R_PPC_ADDR16_HI,
# R_PPC_ADDR16_HA,R_PPC_ADDR16_LO,
# R_PPC_NONE
grep -F -w -v 'R_PPC64_RELATIVE
R_PPC64_NONE
R_PPC_ADDR16_LO
R_PPC_ADDR16_HI
R_PPC_ADDR16_HA
R_PPC_RELATIVE
R_PPC_NONE' |
grep -E -v '\<R_PPC64_ADDR64[[:space:]]+mach_'
)
if [ -z "$bad_relocs" ]; then
exit 0
fi
num_bad=$(echo "$bad_relocs" | wc -l)
echo "WARNING: $num_bad bad relocations"
echo "$bad_relocs"
# If we see this type of relocation it's an idication that
# we /may/ be using an old version of binutils.
if echo "$bad_relocs" | grep -q -F -w R_PPC64_UADDR64; then
echo "WARNING: You need at least binutils >= 2.19 to build a CONFIG_RELOCATABLE kernel"
fi