#!/bin/sh
  # SPDX-License-Identifier: GPL-2.0-only
  
  # Create an autoksyms.h header file from the list of all module's needed symbols
  # as recorded on the second line of *.mod files and the user-provided symbol
  # whitelist.
  
  set -e
  
  output_file="$1"
  
  # Use "make V=1" to debug this script.
  case "$KBUILD_VERBOSE" in
  *1*)
  	set -x
  	;;
  esac
  
  # We need access to CONFIG_ symbols
  . include/config/auto.conf

  needed_symbols=
  
  # Special case for modversions (see modpost.c)
  if [ -n "$CONFIG_MODVERSIONS" ]; then
  	needed_symbols="$needed_symbols module_layout"
  fi

  ksym_wl=

  if [ -n "$CONFIG_UNUSED_KSYMS_WHITELIST" ]; then
  	# Use 'eval' to expand the whitelist path and check if it is relative
  	eval ksym_wl="$CONFIG_UNUSED_KSYMS_WHITELIST"
  	[ "${ksym_wl}" != "${ksym_wl#/}" ] || ksym_wl="$abs_srctree/$ksym_wl"
  	if [ ! -f "$ksym_wl" ] || [ ! -r "$ksym_wl" ]; then
  		echo "ERROR: '$ksym_wl' whitelist file not found" >&2
  		exit 1
  	fi
  fi
  
  # Generate a new ksym list file with symbols needed by the current
  # set of modules.
  cat > "$output_file" << EOT
  /*
   * Automatically generated file; DO NOT EDIT.
   */
  
  EOT

  [ -f modules.order ] && modlist=modules.order || modlist=/dev/null

  
  {
  	sed 's/ko$/mod/' $modlist | xargs -n1 sed -n -e '2p'
  	echo "$needed_symbols"
  	[ -n "$ksym_wl" ] && cat "$ksym_wl"
  } | sed -e 's/ /
  /g' | sed -n -e '/^$/!p' |

  # Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
  # point addresses.
  sed -e 's/^\.//' |

  sort -u |
  sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"