1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0-only
3
4# Create an autoksyms.h header file from the list of all module's needed symbols
5# as recorded on the second line of *.mod files and the user-provided symbol
6# whitelist.
7
8set -e
9
10output_file="$1"
11
12# Use "make V=1" to debug this script.
13case "$KBUILD_VERBOSE" in
14*1*)
15	set -x
16	;;
17esac
18
19# We need access to CONFIG_ symbols
20. include/config/auto.conf
21
22ksym_wl=/dev/null
23if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
24	# Use 'eval' to expand the whitelist path and check if it is relative
25	eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
26	[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
27	if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
28		echo "ERROR: '$ksym_wl' whitelist file not found" >&2
29		exit 1
30	fi
31fi
32
33# Generate a new ksym list file with symbols needed by the current
34# set of modules.
35cat > "$output_file" << EOT
36/*
37 * Automatically generated file; DO NOT EDIT.
38 */
39
40EOT
41
42[ -f modules.order ] && modlist=modules.order || modlist=/dev/null
43sed 's/ko$/mod/' $modlist |
44xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
45cat - "$ksym_wl" |
46sort -u |
47sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
48
49# Special case for modversions (see modpost.c)
50if [ -n "$CONFIG_MODVERSIONS" ]; then
51	echo "#define __KSYM_module_layout 1" >> "$output_file"
52fi
53