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#!/bin/bash -e
# 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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