LXR linux/scripts/gen

   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