diff options
author | Alexandre Ghiti <alex@ghiti.fr> | 2023-03-29 07:53:27 +0300 |
---|---|---|
committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-04-19 17:46:31 +0300 |
commit | 47981b5cc6871d78aee67b6c9ae70aff90ddb97d (patch) | |
tree | fec87ba32d4be2e3c55906bef226946af3268a3d /scripts/relocs_check.sh | |
parent | 39b33072941f8bab82aa2c802044062385a046bf (diff) | |
download | linux-47981b5cc6871d78aee67b6c9ae70aff90ddb97d.tar.xz |
powerpc: Move script to check relocations at compile time in scripts/
Relocating kernel at runtime is done very early in the boot process, so
it is not convenient to check for relocations there and react in case a
relocation was not expected.
Powerpc architecture has a script that allows to check at compile time
for such unexpected relocations: extract the common logic to scripts/
so that other architectures can take advantage of it.
Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Anup Patel <anup@brainfault.org>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Link: https://lore.kernel.org/r/20230329045329.64565-5-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'scripts/relocs_check.sh')
-rwxr-xr-x | scripts/relocs_check.sh | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/scripts/relocs_check.sh b/scripts/relocs_check.sh new file mode 100755 index 000000000000..137c660499f3 --- /dev/null +++ b/scripts/relocs_check.sh @@ -0,0 +1,20 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later + +# Get a list of all the relocations, remove from it the relocations +# that are known to be legitimate and return this list to arch specific +# script that will look for suspicious relocations. + +objdump="$1" +nm="$2" +vmlinux="$3" + +# Remove from the possible bad relocations those that match an undefined +# weak symbol which will result in an absolute relocation to 0. +# Weak unresolved symbols are of that form in nm output: +# " w _binary__btf_vmlinux_bin_end" +undef_weak_symbols=$($nm "$vmlinux" | awk '$1 ~ /w/ { print $2 }') + +$objdump -R "$vmlinux" | + grep -E '\<R_' | + ([ "$undef_weak_symbols" ] && grep -F -w -v "$undef_weak_symbols" || cat) |