63 lines
1.6 KiB
Bash
63 lines
1.6 KiB
Bash
|
#!/bin/sh
|
||
|
|
# SPDX-License-Identifier: GPL-2.0-or-later
|
||
|
|
|
||
|
|
# Copyright © 2015 IBM Corporation
|
||
|
|
|
||
|
|
|
||
|
|
# This script checks the relocations of a vmlinux for "suspicious"
|
||
|
|
# relocations.
|
||
|
|
|
||
|
|
# based on relocs_check.pl
|
||
|
|
# Copyright © 2009 IBM Corporation
|
||
|
|
|
||
|
|
if [ $# -lt 3 ]; then
|
||
|
|
echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2
|
||
|
|
exit 1
|
||
|
|
fi
|
||
|
|
|
||
|
|
# Have Kbuild supply the path to objdump and nm so we handle cross compilation.
|
||
|
|
objdump="$1"
|
||
|
|
nm="$2"
|
||
|
|
vmlinux="$3"
|
||
|
|
|
||
|
|
# Remove from the bad relocations those that match an undefined weak symbol
|
||
|
|
# which will result in an absolute relocation to 0.
|
||
|
|
# Weak unresolved symbols are of that form in nm output:
|
||
|
|
# " w _binary__btf_vmlinux_bin_end"
|
||
|
|
undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }')
|
||
|
|
|
||
|
|
bad_relocs=$(
|
||
|
|
$objdump -R "$vmlinux" |
|
||
|
|
# Only look at relocation lines.
|
||
|
|
grep -E '\<R_' |
|
||
|
|
# These relocations are okay
|
||
|
|
# On PPC64:
|
||
|
|
# R_PPC64_RELATIVE, R_PPC64_NONE
|
||
|
|
# 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' |
|
||
|
|
([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat)
|
||
|
|
)
|
||
|
|
|
||
|
|
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
|