1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0-only 3 4# Script to create/update include/generated/autoksyms.h and dependency files 5# 6# Copyright: (C) 2016 Linaro Limited 7# Created by: Nicolas Pitre, January 2016 8# 9 10# Create/update the include/generated/autoksyms.h file from the list 11# of all module's needed symbols as recorded on the second line of *.mod files. 12# 13# For each symbol being added or removed, the corresponding dependency 14# file's timestamp is updated to force a rebuild of the affected source 15# file. All arguments passed to this script are assumed to be a command 16# to be exec'd to trigger a rebuild of those files. 17 18set -e 19 20cur_ksyms_file="include/generated/autoksyms.h" 21new_ksyms_file="include/generated/autoksyms.h.tmpnew" 22 23info() { 24 if [ "$quiet" != "silent_" ]; then 25 printf " %-7s %s\n" "$1" "$2" 26 fi 27} 28 29info "CHK" "$cur_ksyms_file" 30 31# Use "make V=1" to debug this script. 32case "$KBUILD_VERBOSE" in 33*1*) 34 set -x 35 ;; 36esac 37 38# We need access to CONFIG_ symbols 39. include/config/auto.conf 40 41# Generate a new ksym list file with symbols needed by the current 42# set of modules. 43cat > "$new_ksyms_file" << EOT 44/* 45 * Automatically generated file; DO NOT EDIT. 46 */ 47 48EOT 49sed 's/ko$/mod/' modules.order | 50xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- | 51sort -u | 52sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$new_ksyms_file" 53 54# Special case for modversions (see modpost.c) 55if [ -n "$CONFIG_MODVERSIONS" ]; then 56 echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file" 57fi 58 59# Extract changes between old and new list and touch corresponding 60# dependency files. 61changed=$( 62count=0 63sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u | 64sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" | 65while read sympath; do 66 if [ -z "$sympath" ]; then continue; fi 67 depfile="include/ksym/${sympath}.h" 68 mkdir -p "$(dirname "$depfile")" 69 touch "$depfile" 70 # Filesystems with coarse time precision may create timestamps 71 # equal to the one from a file that was very recently built and that 72 # needs to be rebuild. Let's guard against that by making sure our 73 # dep files are always newer than the first file we created here. 74 while [ ! "$depfile" -nt "$new_ksyms_file" ]; do 75 touch "$depfile" 76 done 77 echo $((count += 1)) 78done | tail -1 ) 79changed=${changed:-0} 80 81if [ $changed -gt 0 ]; then 82 # Replace the old list with tne new one 83 old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true) 84 new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true) 85 info "KSYMS" "symbols: before=$old, after=$new, changed=$changed" 86 info "UPD" "$cur_ksyms_file" 87 mv -f "$new_ksyms_file" "$cur_ksyms_file" 88 # Then trigger a rebuild of affected source files 89 exec $@ 90else 91 rm -f "$new_ksyms_file" 92fi 93