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- #!/bin/bash -e
- # Copyright 2017 Google Inc. All rights reserved.
- #
- # Licensed under the Apache License, Version 2.0 (the "License");
- # you may not use this file except in compliance with the License.
- # You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- # Unless required by applicable law or agreed to in writing, software
- # distributed under the License is distributed on an "AS IS" BASIS,
- # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- # See the License for the specific language governing permissions and
- # limitations under the License.
- # Script to handle the various ways soong may need to strip binaries
- # Inputs:
- # Environment:
- # CROSS_COMPILE: prefix added to readelf, objcopy tools
- # Arguments:
- # -i ${file}: input file (required)
- # -o ${file}: output file (required)
- # -d ${file}: deps file (required)
- # --keep-symbols
- # --keep-mini-debug-info
- # --add-gnu-debuglink
- OPTSTRING=d:i:o:-:
- usage() {
- cat <<EOF
- Usage: strip.sh [options] -i in-file -o out-file -d deps-file
- Options:
- --keep-symbols Keep symbols in out-file
- --keep-mini-debug-info Keep compressed debug info in out-file
- --add-gnu-debuglink Add a gnu-debuglink section to out-file
- EOF
- exit 1
- }
- do_strip() {
- "${CROSS_COMPILE}strip" --strip-all "${infile}" -o "${outfile}.tmp"
- }
- do_strip_keep_symbols() {
- "${CROSS_COMPILE}objcopy" "${infile}" "${outfile}.tmp" \
- `"${CROSS_COMPILE}readelf" -S "${infile}" | awk '/.debug_/ {print "-R " $2}' | xargs`
- }
- do_strip_keep_mini_debug_info() {
- rm -f "${outfile}.dynsyms" "${outfile}.funcsyms" "${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo" "${outfile}.mini_debuginfo.xz"
- if "${CROSS_COMPILE}strip" --strip-all -R .comment "${infile}" -o "${outfile}.tmp"; then
- "${CROSS_COMPILE}objcopy" --only-keep-debug "${infile}" "${outfile}.debug"
- "${CROSS_COMPILE}nm" -D "${infile}" --format=posix --defined-only | awk '{ print $$1 }' | sort >"${outfile}.dynsyms"
- "${CROSS_COMPILE}nm" "${infile}" --format=posix --defined-only | awk '{ if ($$2 == "T" || $$2 == "t" || $$2 == "D") print $$1 }' | sort > "${outfile}.funcsyms"
- comm -13 "${outfile}.dynsyms" "${outfile}.funcsyms" > "${outfile}.keep_symbols"
- "${CROSS_COMPILE}objcopy" --rename-section .debug_frame=saved_debug_frame "${outfile}.debug" "${outfile}.mini_debuginfo"
- "${CROSS_COMPILE}objcopy" -S --remove-section .gdb_index --remove-section .comment --keep-symbols="${outfile}.keep_symbols" "${outfile}.mini_debuginfo"
- "${CROSS_COMPILE}objcopy" --rename-section saved_debug_frame=.debug_frame "${outfile}.mini_debuginfo"
- xz "${outfile}.mini_debuginfo"
- "${CROSS_COMPILE}objcopy" --add-section .gnu_debugdata="${outfile}.mini_debuginfo.xz" "${outfile}.tmp"
- else
- cp -f "${infile}" "${outfile}.tmp"
- fi
- }
- do_add_gnu_debuglink() {
- "${CROSS_COMPILE}objcopy" --add-gnu-debuglink="${infile}" "${outfile}.tmp"
- }
- while getopts $OPTSTRING opt; do
- case "$opt" in
- d) depsfile="${OPTARG}" ;;
- i) infile="${OPTARG}" ;;
- o) outfile="${OPTARG}" ;;
- -)
- case "${OPTARG}" in
- keep-symbols) keep_symbols=true ;;
- keep-mini-debug-info) keep_mini_debug_info=true ;;
- add-gnu-debuglink) add_gnu_debuglink=true ;;
- *) echo "Unknown option --${OPTARG}"; usage ;;
- esac;;
- ?) usage ;;
- *) echo "'${opt}' '${OPTARG}'"
- esac
- done
- if [ -z "${infile}" ]; then
- echo "-i argument is required"
- usage
- fi
- if [ -z "${outfile}" ]; then
- echo "-o argument is required"
- usage
- fi
- if [ -z "${depsfile}" ]; then
- echo "-d argument is required"
- usage
- fi
- if [ ! -z "${keep_symbols}" -a ! -z "${keep_mini_debug_info}" ]; then
- echo "--keep-symbols and --keep-mini-debug-info cannot be used together"
- usage
- fi
- if [ ! -z "${add_gnu_debuglink}" -a ! -z "${keep_mini_debug_info}" ]; then
- echo "--add-gnu-debuglink cannot be used with --keep-mini-debug-info"
- usage
- fi
- rm -f "${outfile}.tmp"
- if [ ! -z "${keep_symbols}" ]; then
- do_strip_keep_symbols
- elif [ ! -z "${keep_mini_debug_info}" ]; then
- do_strip_keep_mini_debug_info
- else
- do_strip
- fi
- if [ ! -z "${add_gnu_debuglink}" ]; then
- do_add_gnu_debuglink
- fi
- rm -f "${outfile}"
- mv "${outfile}.tmp" "${outfile}"
- cat <<EOF > "${depsfile}"
- ${outfile}: \
- ${infile} \
- ${CROSS_COMPILE}nm \
- ${CROSS_COMPILE}objcopy \
- ${CROSS_COMPILE}readelf \
- ${CROSS_COMPILE}strip
- EOF
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