1b71c9ffbSNicholas Piggin#!/bin/sh 22874c5fdSThomas Gleixner# SPDX-License-Identifier: GPL-2.0-or-later 3b71c9ffbSNicholas Piggin 4b71c9ffbSNicholas Piggin# Copyright © 2015 IBM Corporation 5b71c9ffbSNicholas Piggin 6b71c9ffbSNicholas Piggin 7b71c9ffbSNicholas Piggin# This script checks the relocations of a vmlinux for "suspicious" 8b71c9ffbSNicholas Piggin# relocations. 9b71c9ffbSNicholas Piggin 10b71c9ffbSNicholas Piggin# based on relocs_check.pl 11b71c9ffbSNicholas Piggin# Copyright © 2009 IBM Corporation 12b71c9ffbSNicholas Piggin 1343e76cd3SAlexandre Ghitiif [ $# -lt 3 ]; then 1443e76cd3SAlexandre Ghiti echo "$0 [path to objdump] [path to nm] [path to vmlinux]" 1>&2 15b71c9ffbSNicholas Piggin exit 1 16b71c9ffbSNicholas Pigginfi 17b71c9ffbSNicholas Piggin 1843e76cd3SAlexandre Ghiti# Have Kbuild supply the path to objdump and nm so we handle cross compilation. 19b71c9ffbSNicholas Pigginobjdump="$1" 2043e76cd3SAlexandre Ghitinm="$2" 2143e76cd3SAlexandre Ghitivmlinux="$3" 2243e76cd3SAlexandre Ghiti 2343e76cd3SAlexandre Ghiti# Remove from the bad relocations those that match an undefined weak symbol 2443e76cd3SAlexandre Ghiti# which will result in an absolute relocation to 0. 2543e76cd3SAlexandre Ghiti# Weak unresolved symbols are of that form in nm output: 2643e76cd3SAlexandre Ghiti# " w _binary__btf_vmlinux_bin_end" 2743e76cd3SAlexandre Ghitiundef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }') 28b71c9ffbSNicholas Piggin 29b71c9ffbSNicholas Pigginbad_relocs=$( 30e44ff9eaSMichael Ellerman$objdump -R "$vmlinux" | 31b71c9ffbSNicholas Piggin # Only look at relocation lines. 32b71c9ffbSNicholas Piggin grep -E '\<R_' | 33b71c9ffbSNicholas Piggin # These relocations are okay 34b71c9ffbSNicholas Piggin # On PPC64: 35b71c9ffbSNicholas Piggin # R_PPC64_RELATIVE, R_PPC64_NONE 36b71c9ffbSNicholas Piggin # On PPC: 37b71c9ffbSNicholas Piggin # R_PPC_RELATIVE, R_PPC_ADDR16_HI, 38b71c9ffbSNicholas Piggin # R_PPC_ADDR16_HA,R_PPC_ADDR16_LO, 39b71c9ffbSNicholas Piggin # R_PPC_NONE 40b71c9ffbSNicholas Piggin grep -F -w -v 'R_PPC64_RELATIVE 41b71c9ffbSNicholas PigginR_PPC64_NONE 42*d7997691SAlexey KardashevskiyR_PPC64_UADDR64 43b71c9ffbSNicholas PigginR_PPC_ADDR16_LO 44b71c9ffbSNicholas PigginR_PPC_ADDR16_HI 45b71c9ffbSNicholas PigginR_PPC_ADDR16_HA 46b71c9ffbSNicholas PigginR_PPC_RELATIVE 47b71c9ffbSNicholas PigginR_PPC_NONE' | 4843e76cd3SAlexandre Ghiti ([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat) 49b71c9ffbSNicholas Piggin) 50b71c9ffbSNicholas Piggin 51b71c9ffbSNicholas Pigginif [ -z "$bad_relocs" ]; then 52b71c9ffbSNicholas Piggin exit 0 53b71c9ffbSNicholas Pigginfi 54b71c9ffbSNicholas Piggin 55b71c9ffbSNicholas Pigginnum_bad=$(echo "$bad_relocs" | wc -l) 56b71c9ffbSNicholas Pigginecho "WARNING: $num_bad bad relocations" 57b71c9ffbSNicholas Pigginecho "$bad_relocs" 58