[linux-block.git] / scripts / tools-support-relr.sh

#!/bin/sh -eu
# SPDX-License-Identifier: GPL-2.0

tmp_file=$(mktemp)
trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT

cat << "END" | $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
void *p = &p;
END

# ld.lld before 15 did not support -z pack-relative-relocs.
if ! $LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file 2>/dev/null; then
	$LD $tmp_file.o -shared -Bsymbolic -z pack-relative-relocs -o $tmp_file 2>&1 |
		grep -q pack-relative-relocs && exit 1
fi

# Despite printing an error message, GNU nm still exits with exit code 0 if it
# sees a relr section. So we need to check that nothing is printed to stderr.
test -z "$($NM $tmp_file 2>&1 >/dev/null)"

$OBJCOPY -O binary $tmp_file $tmp_file.bin
Commit	Line	Data
5cf896fb PC	1	#!/bin/sh -eu
	2	# SPDX-License-Identifier: GPL-2.0
	3
	4	tmp_file=$(mktemp)
	5	trap "rm -f $tmp_file.o $tmp_file $tmp_file.bin" EXIT
	6
65e1f38d	7	cat << "END" \| $CC -c -x c - -o $tmp_file.o >/dev/null 2>&1
5cf896fb PC	8	void *p = &p;
5cf896fb PC	9	END
ccb2d173 FS	10
	11	# ld.lld before 15 did not support -z pack-relative-relocs.
	12	if ! $LD $tmp_file.o -shared -Bsymbolic --pack-dyn-relocs=relr -o $tmp_file 2>/dev/null; then
	13	$LD $tmp_file.o -shared -Bsymbolic -z pack-relative-relocs -o $tmp_file 2>&1 \|
	14	grep -q pack-relative-relocs && exit 1
	15	fi
5cf896fb PC	16
	17	# Despite printing an error message, GNU nm still exits with exit code 0 if it
	18	# sees a relr section. So we need to check that nothing is printed to stderr.
65e1f38d	19	test -z "$($NM $tmp_file 2>&1 >/dev/null)"
5cf896fb	20
65e1f38d	21	$OBJCOPY -O binary $tmp_file $tmp_file.bin