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 
8 set -e
9 
10 output_file="$1"
11 
12 # Use "make V=1" to debug this script.
13 case "$KBUILD_VERBOSE" in
14 *1*)
15 	set -x
16 	;;
17 esac
18 
19 # We need access to CONFIG_ symbols
20 . include/config/auto.conf
21 
22 needed_symbols=
23 
24 # Special case for modversions (see modpost.c)
25 if [ -n "$CONFIG_MODVERSIONS" ]; then
26 	needed_symbols="$needed_symbols module_layout"
27 fi
28 
29 ksym_wl=
30 if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
31 	# Use 'eval' to expand the whitelist path and check if it is relative
32 	eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
33 	[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
34 	if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
35 		echo "ERROR: '$ksym_wl' whitelist file not found" >&2
36 		exit 1
37 	fi
38 fi
39 
40 # Generate a new ksym list file with symbols needed by the current
41 # set of modules.
42 cat > "$output_file" << EOT
43 /*
44  * Automatically generated file; DO NOT EDIT.
45  */
46 
47 EOT
48 
49 [ -f modules.order ] && modlist=modules.order || modlist=/dev/null
50 
51 {
52 	sed 's/ko$/mod/' $modlist | xargs -n1 sed -n -e '2p'
53 	echo "$needed_symbols"
54 	[ -n "$ksym_wl" ] && cat "$ksym_wl"
55 } | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
56 # Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
57 # point addresses.
58 sed -e 's/^\.//' |
59 sort -u |
60 sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"
61