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 in *.usyms files and the user-provided symbol whitelist.
6
7set -e
8
9# Use "make V=1" to debug this script.
10case "$KBUILD_VERBOSE" in
11*1*)
12	set -x
13	;;
14esac
15
16read_modorder=
17
18if [ "$1" = --modorder ]; then
19	shift
20	read_modorder=1
21fi
22
23output_file="$1"
24
25needed_symbols=
26
27# Special case for modversions (see modpost.c)
28if grep -q "^CONFIG_MODVERSIONS=y$" include/config/auto.conf; then
29	needed_symbols="$needed_symbols module_layout"
30fi
31
32ksym_wl=$(sed -n 's/^CONFIG_UNUSED_KSYMS_WHITELIST=\(.*\)$/\1/p' include/config/auto.conf)
33if [ -n "$ksym_wl" ]; then
34	[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
35	if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
36		echo "ERROR: '$ksym_wl' whitelist file not found" >&2
37		exit 1
38	fi
39fi
40
41# Generate a new ksym list file with symbols needed by the current
42# set of modules.
43cat > "$output_file" << EOT
44/*
45 * Automatically generated file; DO NOT EDIT.
46 */
47
48EOT
49
50{
51	[ -n "${read_modorder}" ] && sed 's/o$/usyms/' modules.order | xargs cat
52	echo "$needed_symbols"
53	[ -n "$ksym_wl" ] && cat "$ksym_wl"
54} | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
55# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
56# point addresses.
57sed -e 's/^\.//' |
58sort -u |
59# Ignore __this_module. It's not an exported symbol, and will be resolved
60# when the final .ko's are linked.
61grep -v '^__this_module$' |
62sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
63