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 8set -e 9 10output_file="$1" 11 12# Use "make V=1" to debug this script. 13case "$KBUILD_VERBOSE" in 14*1*) 15 set -x 16 ;; 17esac 18 19# We need access to CONFIG_ symbols 20. include/config/auto.conf 21 22needed_symbols= 23 24# Special case for modversions (see modpost.c) 25if [ -n "$CONFIG_MODVERSIONS" ]; then 26 needed_symbols="$needed_symbols module_layout" 27fi 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. 32if [ -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" 39fi 40 41ksym_wl= 42if [ -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: '$ksym_wl' whitelist file not found" >&2 48 exit 1 49 fi 50fi 51 52# Generate a new ksym list file with symbols needed by the current 53# set of modules. 54cat > "$output_file" << EOT 55/* 56 * Automatically generated file; DO NOT EDIT. 57 */ 58 59EOT 60 61[ -f modules.order ] && modlist=modules.order || modlist=/dev/null 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' | 68# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry 69# point addresses. 70sed -e 's/^\.//' | 71sort -u | 72sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file" 73