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1#!/bin/sh
2
3# Script to create/update include/generated/autoksyms.h and dependency files
4#
5# Copyright: (C) 2016 Linaro Limited
6# Created by: Nicolas Pitre, January 2016
7#
8# This program is free software; you can redistribute it and/or modify
9# it under the terms of the GNU General Public License version 2 as
10# published by the Free Software Foundation.
11
12# Create/update the include/generated/autoksyms.h file from the list
13# of all module's needed symbols as recorded on the third line of
14# .tmp_versions/*.mod files.
15#
16# For each symbol being added or removed, the corresponding dependency
17# file's timestamp is updated to force a rebuild of the affected source
18# file. All arguments passed to this script are assumed to be a command
19# to be exec'd to trigger a rebuild of those files.
20
21set -e
22
23cur_ksyms_file="include/generated/autoksyms.h"
24new_ksyms_file="include/generated/autoksyms.h.tmpnew"
25
26info() {
27 if [ "$quiet" != "silent_" ]; then
28 printf " %-7s %s\n" "$1" "$2"
29 fi
30}
31
32info "CHK" "$cur_ksyms_file"
33
34# Use "make V=1" to debug this script.
35case "$KBUILD_VERBOSE" in
36*1*)
37 set -x
38 ;;
39esac
40
41# We need access to CONFIG_ symbols
42. include/config/auto.conf
43
44# Generate a new ksym list file with symbols needed by the current
45# set of modules.
46cat > "$new_ksyms_file" << EOT
47/*
48 * Automatically generated file; DO NOT EDIT.
49 */
50
51EOT
52[ "$(ls -A "$MODVERDIR")" ] &&
53for mod in "$MODVERDIR"/*.mod; do
54 sed -n -e '3{s/ /\n/g;/^$/!p;}' "$mod"
55done | sort -u |
56while read sym; do
57 echo "#define __KSYM_${sym} 1"
58done >> "$new_ksyms_file"
59
60# Special case for modversions (see modpost.c)
61if [ -n "$CONFIG_MODVERSIONS" ]; then
62 echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
63fi
64
65# Extract changes between old and new list and touch corresponding
66# dependency files.
67changed=$(
68count=0
69sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
70sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
71while read sympath; do
72 if [ -z "$sympath" ]; then continue; fi
73 depfile="include/ksym/${sympath}.h"
74 mkdir -p "$(dirname "$depfile")"
75 touch "$depfile"
76 # Filesystems with coarse time precision may create timestamps
77 # equal to the one from a file that was very recently built and that
78 # needs to be rebuild. Let's guard against that by making sure our
79 # dep files are always newer than the first file we created here.
80 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
81 touch "$depfile"
82 done
83 echo $((count += 1))
84done | tail -1 )
85changed=${changed:-0}
86
87if [ $changed -gt 0 ]; then
88 # Replace the old list with tne new one
89 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
90 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
91 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
92 info "UPD" "$cur_ksyms_file"
93 mv -f "$new_ksyms_file" "$cur_ksyms_file"
94 # Then trigger a rebuild of affected source files
95 exec $@
96else
97 rm -f "$new_ksyms_file"
98fi