scripts/adjust_autoksyms.sh

   1 #!/bin/sh
   2
   3 # Script to create/update include/generated/autoksyms.h and dependency files
   4 #
   5 # Copyright:    (C) 2016  Linaro Limited
   6 # Created by:   Nicolas Pitre, January 2016
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License version 2 as
  10 # published by the Free Software Foundation.
  11
  12 # Create/update the include/generated/autoksyms.h file from the list
  13 # of all module's needed symbols as recorded on the third line of
  14 # .tmp_versions/*.mod files.
  15 #
  16 # For each symbol being added or removed, the corresponding dependency
  17 # file's timestamp is updated to force a rebuild of the affected source
  18 # file. All arguments passed to this script are assumed to be a command
  19 # to be exec'd to trigger a rebuild of those files.
  20
  21 set -e
  22
  23 cur_ksyms_file="include/generated/autoksyms.h"
  24 new_ksyms_file="include/generated/autoksyms.h.tmpnew"
  25
  26 info() {
  27         if [ "$quiet" != "silent_" ]; then
  28                 printf "  %-7s %s\n" "$1" "$2"
  29         fi
  30 }
  31
  32 info "CHK" "$cur_ksyms_file"
  33
  34 # Use "make V=1" to debug this script.
  35 case "$KBUILD_VERBOSE" in
  36 *1*)
  37         set -x
  38         ;;
  39 esac
  40
  41 # We need access to CONFIG_ symbols
  42 case "${KCONFIG_CONFIG}" in
  43 */*)
  44         . "${KCONFIG_CONFIG}"
  45         ;;
  46 *)
  47         # Force using a file from the current directory
  48         . "./${KCONFIG_CONFIG}"
  49 esac
  50
  51 # In case it doesn't exist yet...
  52 if [ -e "$cur_ksyms_file" ]; then touch "$cur_ksyms_file"; fi
  53
  54 # Generate a new ksym list file with symbols needed by the current
  55 # set of modules.
  56 cat > "$new_ksyms_file" << EOT
  57 /*
  58  * Automatically generated file; DO NOT EDIT.
  59  */
  60
  61 EOT
  62 sed -ns -e '3{s/ /\n/g;/^$/!p;}' "$MODVERDIR"/*.mod | sort -u |
  63 while read sym; do
  64         if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then
  65                 sym="${sym#_}"
  66         fi
  67         echo "#define __KSYM_${sym} 1"
  68 done >> "$new_ksyms_file"
  69
  70 # Special case for modversions (see modpost.c)
  71 if [ -n "$CONFIG_MODVERSIONS" ]; then
  72         echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
  73 fi
  74
  75 # Extract changes between old and new list and touch corresponding
  76 # dependency files.
  77 changed=$(
  78 count=0
  79 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
  80 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
  81 while read sympath; do
  82         if [ -z "$sympath" ]; then continue; fi
  83         depfile="include/config/ksym/${sympath}.h"
  84         mkdir -p "$(dirname "$depfile")"
  85         touch "$depfile"
  86         # Filesystems with coarse time precision may create timestamps
  87         # equal to the one from a file that was very recently built and that
  88         # needs to be rebuild. Let's guard against that by making sure our
  89         # dep files are always newer than the first file we created here.
  90         while [ ! "$depfile" -nt "$new_ksyms_file" ]; do
  91                 touch "$depfile"
  92         done
  93         echo $((count += 1))
  94 done | tail -1 )
  95 changed=${changed:-0}
  96
  97 if [ $changed -gt 0 ]; then
  98         # Replace the old list with tne new one
  99         old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
 100         new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
 101         info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
 102         info "UPD" "$cur_ksyms_file"
 103         mv -f "$new_ksyms_file" "$cur_ksyms_file"
 104         # Then trigger a rebuild of affected source files
 105         exec $@
 106 else
 107         rm -f "$new_ksyms_file"
 108 fi