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Linux/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 > "$new_ksyms_file" << EOT
 57 /*
 58  * Automatically generated file; DO NOT EDIT.
 59  */
 60 
 61 EOT
 62 [ "$(ls -A "$MODVERDIR")" ] &&
 63 sed -ns -e '3{s/ /\n/g;/^$/!p;}' "$MODVERDIR"/*.mod | sort -u |
 64 while read sym; do
 65         if [ -n "$CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX" ]; then
 66                 sym="${sym#_}"
 67         fi
 68         echo "#define __KSYM_${sym} 1"
 69 done >> "$new_ksyms_file"
 70 
 71 # Special case for modversions (see modpost.c)
 72 if [ -n "$CONFIG_MODVERSIONS" ]; then
 73         echo "#define __KSYM_module_layout 1" >> "$new_ksyms_file"
 74 fi
 75 
 76 # Extract changes between old and new list and touch corresponding
 77 # dependency files.
 78 changed=$(
 79 count=0
 80 sort "$cur_ksyms_file" "$new_ksyms_file" | uniq -u |
 81 sed -n 's/^#define __KSYM_\(.*\) 1/\1/p' | tr "A-Z_" "a-z/" |
 82 while read sympath; do
 83         if [ -z "$sympath" ]; then continue; fi
 84         depfile="include/config/ksym/${sympath}.h"
 85         mkdir -p "$(dirname "$depfile")"
 86         touch "$depfile"
 87         echo $((count += 1))
 88 done | tail -1 )
 89 changed=${changed:-0}
 90 
 91 if [ $changed -gt 0 ]; then
 92         # Replace the old list with tne new one
 93         old=$(grep -c "^#define __KSYM_" "$cur_ksyms_file" || true)
 94         new=$(grep -c "^#define __KSYM_" "$new_ksyms_file" || true)
 95         info "KSYMS" "symbols: before=$old, after=$new, changed=$changed"
 96         info "UPD" "$cur_ksyms_file"
 97         mv -f "$new_ksyms_file" "$cur_ksyms_file"
 98         # Then trigger a rebuild of affected source files
 99         exec $@
100 else
101         rm -f "$new_ksyms_file"
102 fi

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