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 13b71c9ffbSNicholas Pigginif [ $# -lt 2 ]; then 14b71c9ffbSNicholas Piggin echo "$0 [path to objdump] [path to vmlinux]" 1>&2 15b71c9ffbSNicholas Piggin exit 1 16b71c9ffbSNicholas Pigginfi 17b71c9ffbSNicholas Piggin 18b71c9ffbSNicholas Piggin# Have Kbuild supply the path to objdump so we handle cross compilation. 19b71c9ffbSNicholas Pigginobjdump="$1" 20b71c9ffbSNicholas Pigginvmlinux="$2" 21b71c9ffbSNicholas Piggin 22b71c9ffbSNicholas Pigginbad_relocs=$( 23e44ff9eaSMichael Ellerman$objdump -R "$vmlinux" | 24b71c9ffbSNicholas Piggin # Only look at relocation lines. 25b71c9ffbSNicholas Piggin grep -E '\<R_' | 26b71c9ffbSNicholas Piggin # These relocations are okay 27b71c9ffbSNicholas Piggin # On PPC64: 28b71c9ffbSNicholas Piggin # R_PPC64_RELATIVE, R_PPC64_NONE 29b71c9ffbSNicholas Piggin # R_PPC64_ADDR64 mach_<name> 30b71c9ffbSNicholas Piggin # R_PPC64_ADDR64 __crc_<name> 31b71c9ffbSNicholas Piggin # On PPC: 32b71c9ffbSNicholas Piggin # R_PPC_RELATIVE, R_PPC_ADDR16_HI, 33b71c9ffbSNicholas Piggin # R_PPC_ADDR16_HA,R_PPC_ADDR16_LO, 34b71c9ffbSNicholas Piggin # R_PPC_NONE 35b71c9ffbSNicholas Piggin grep -F -w -v 'R_PPC64_RELATIVE 36b71c9ffbSNicholas PigginR_PPC64_NONE 37b71c9ffbSNicholas PigginR_PPC_ADDR16_LO 38b71c9ffbSNicholas PigginR_PPC_ADDR16_HI 39b71c9ffbSNicholas PigginR_PPC_ADDR16_HA 40b71c9ffbSNicholas PigginR_PPC_RELATIVE 41b71c9ffbSNicholas PigginR_PPC_NONE' | 42b71c9ffbSNicholas Piggin grep -E -v '\<R_PPC64_ADDR64[[:space:]]+mach_' | 43b71c9ffbSNicholas Piggin grep -E -v '\<R_PPC64_ADDR64[[:space:]]+__crc_' 44b71c9ffbSNicholas Piggin) 45b71c9ffbSNicholas Piggin 46b71c9ffbSNicholas Pigginif [ -z "$bad_relocs" ]; then 47b71c9ffbSNicholas Piggin exit 0 48b71c9ffbSNicholas Pigginfi 49b71c9ffbSNicholas Piggin 50b71c9ffbSNicholas Pigginnum_bad=$(echo "$bad_relocs" | wc -l) 51b71c9ffbSNicholas Pigginecho "WARNING: $num_bad bad relocations" 52b71c9ffbSNicholas Pigginecho "$bad_relocs" 53b71c9ffbSNicholas Piggin 54b71c9ffbSNicholas Piggin# If we see this type of relocation it's an idication that 55b71c9ffbSNicholas Piggin# we /may/ be using an old version of binutils. 56b71c9ffbSNicholas Pigginif echo "$bad_relocs" | grep -q -F -w R_PPC64_UADDR64; then 57b71c9ffbSNicholas Piggin echo "WARNING: You need at least binutils >= 2.19 to build a CONFIG_RELOCATABLE kernel" 58b71c9ffbSNicholas Pigginfi 59