mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 04:54:41 +08:00
47981b5cc6
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>
21 lines
717 B
Bash
Executable File
21 lines
717 B
Bash
Executable File
#!/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)
|