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cd195bc4 QP |
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 | ||
a6aaeb84 MY |
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 | # With CONFIG_LTO_CLANG, LLVM bitcode has not yet been compiled into a binary | |
30 | # when the .mod files are generated, which means they don't yet contain | |
31 | # references to certain symbols that will be present in the final binaries. | |
32 | if [ -n "$CONFIG_LTO_CLANG" ]; then | |
33 | # intrinsic functions | |
34 | needed_symbols="$needed_symbols memcpy memmove memset" | |
35 | # ftrace | |
36 | needed_symbols="$needed_symbols _mcount" | |
37 | # stack protector symbols | |
38 | needed_symbols="$needed_symbols __stack_chk_fail __stack_chk_guard" | |
39 | fi | |
40 | ||
41 | ksym_wl= | |
cd195bc4 QP |
42 | if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then |
43 | # Use 'eval' to expand the whitelist path and check if it is relative | |
44 | eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST" | |
45 | [ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl" | |
46 | if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then | |
47 | echo "ERROR: '$ksym_wl' whitelist file not found" >&2 | |
48 | exit 1 | |
49 | fi | |
50 | fi | |
51 | ||
52 | # Generate a new ksym list file with symbols needed by the current | |
53 | # set of modules. | |
54 | cat > "$output_file" << EOT | |
55 | /* | |
56 | * Automatically generated file; DO NOT EDIT. | |
57 | */ | |
58 | ||
59 | EOT | |
60 | ||
88694cff | 61 | [ -f modules.order ] && modlist=modules.order || modlist=/dev/null |
a6aaeb84 MY |
62 | |
63 | { | |
64 | sed 's/ko$/mod/' $modlist | xargs -n1 sed -n -e '2p' | |
65 | echo "$needed_symbols" | |
66 | [ -n "$ksym_wl" ] && cat "$ksym_wl" | |
67 | } | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' | | |
29500f15 MY |
68 | # Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry |
69 | # point addresses. | |
70 | sed -e 's/^\.//' | | |
cd195bc4 QP |
71 | sort -u | |
72 | sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file" |