1*4882a593Smuzhiyun#!/bin/sh 2*4882a593Smuzhiyun# SPDX-License-Identifier: GPL-2.0-only 3*4882a593Smuzhiyun 4*4882a593Smuzhiyun# Create an autoksyms.h header file from the list of all module's needed symbols 5*4882a593Smuzhiyun# as recorded on the second line of *.mod files and the user-provided symbol 6*4882a593Smuzhiyun# whitelist. 7*4882a593Smuzhiyun 8*4882a593Smuzhiyunset -e 9*4882a593Smuzhiyun 10*4882a593Smuzhiyunoutput_file="$1" 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun# Use "make V=1" to debug this script. 13*4882a593Smuzhiyuncase "$KBUILD_VERBOSE" in 14*4882a593Smuzhiyun*1*) 15*4882a593Smuzhiyun set -x 16*4882a593Smuzhiyun ;; 17*4882a593Smuzhiyunesac 18*4882a593Smuzhiyun 19*4882a593Smuzhiyun# We need access to CONFIG_ symbols 20*4882a593Smuzhiyun. include/config/auto.conf 21*4882a593Smuzhiyun 22*4882a593Smuzhiyunneeded_symbols= 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun# Special case for modversions (see modpost.c) 25*4882a593Smuzhiyunif [ -n "$CONFIG_MODVERSIONS" ]; then 26*4882a593Smuzhiyun needed_symbols="$needed_symbols module_layout" 27*4882a593Smuzhiyunfi 28*4882a593Smuzhiyun 29*4882a593Smuzhiyun# With CONFIG_LTO_CLANG, LLVM bitcode has not yet been compiled into a binary 30*4882a593Smuzhiyun# when the .mod files are generated, which means they don't yet contain 31*4882a593Smuzhiyun# references to certain symbols that will be present in the final binaries. 32*4882a593Smuzhiyunif [ -n "$CONFIG_LTO_CLANG" ]; then 33*4882a593Smuzhiyun # intrinsic functions 34*4882a593Smuzhiyun needed_symbols="$needed_symbols memcpy memmove memset" 35*4882a593Smuzhiyun # ftrace 36*4882a593Smuzhiyun needed_symbols="$needed_symbols _mcount" 37*4882a593Smuzhiyun # stack protector symbols 38*4882a593Smuzhiyun needed_symbols="$needed_symbols __stack_chk_fail __stack_chk_guard" 39*4882a593Smuzhiyunfi 40*4882a593Smuzhiyun 41*4882a593Smuzhiyunksym_wl= 42*4882a593Smuzhiyunif [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then 43*4882a593Smuzhiyun # Use 'eval' to expand the whitelist path and check if it is relative 44*4882a593Smuzhiyun eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST" 45*4882a593Smuzhiyun [ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl" 46*4882a593Smuzhiyun if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then 47*4882a593Smuzhiyun echo "ERROR: '$ksym_wl' whitelist file not found" >&2 48*4882a593Smuzhiyun exit 1 49*4882a593Smuzhiyun fi 50*4882a593Smuzhiyunfi 51*4882a593Smuzhiyun 52*4882a593Smuzhiyun# Generate a new ksym list file with symbols needed by the current 53*4882a593Smuzhiyun# set of modules. 54*4882a593Smuzhiyuncat > "$output_file" << EOT 55*4882a593Smuzhiyun/* 56*4882a593Smuzhiyun * Automatically generated file; DO NOT EDIT. 57*4882a593Smuzhiyun */ 58*4882a593Smuzhiyun 59*4882a593SmuzhiyunEOT 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun[ -f modules.order ] && modlist=modules.order || modlist=/dev/null 62*4882a593Smuzhiyun 63*4882a593Smuzhiyun{ 64*4882a593Smuzhiyun sed 's/ko$/mod/' $modlist | xargs -n1 sed -n -e '2p' 65*4882a593Smuzhiyun echo "$needed_symbols" 66*4882a593Smuzhiyun [ -n "$ksym_wl" ] && cat "$ksym_wl" 67*4882a593Smuzhiyun} | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' | 68*4882a593Smuzhiyun# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry 69*4882a593Smuzhiyun# point addresses. 70*4882a593Smuzhiyunsed -e 's/^\.//' | 71*4882a593Smuzhiyunsort -u | 72*4882a593Smuzhiyunsed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file" 73