xref: /linux/scripts/tools-support-relr.sh (revision 69bfec7548f4c1595bac0e3ddfc0458a5af31f4c)
1#!/bin/sh -eu
2# SPDX-License-Identifier: GPL-2.0
3
4tmp_file=$(mktemp)
5trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
6
7cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
8void *p = &p;
9END
10$LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr \
11  --use-android-relr-tags -o $tmp_file
12
13# Despite printing an error message, GNU nm still exits with exit code 0 if it
14# sees a relr section. So we need to check that nothing is printed to stderr.
15test -z "$($NM $tmp_file 2>&1 >/dev/null)"
16
17$OBJCOPY -O binary $tmp_file $tmp_file.bin
18