1 #!/bin/bash -e 2 3 # Script to handle the various ways soong may need to strip binaries 4 # Inputs: 5 # Environment: 6 # CROSS_COMPILE: prefix added to readelf, objcopy tools 7 # Arguments: 8 # -i ${file}: input file (required) 9 # -o ${file}: output file (required) 10 # -d ${file}: deps file (required) 11 # --keep-symbols 12 # --keep-mini-debug-info 13 # --add-gnu-debuglink 14 15 OPTSTRING=d:i:o:-: 16 17 usage() { 18 cat <<EOF 19 Usage: strip.sh [options] -i in-file -o out-file -d deps-file 20 Options: 21 --keep-symbols Keep symbols in out-file 22 --keep-mini-debug-info Keep compressed debug info in out-file 23 --add-gnu-debuglink Add a gnu-debuglink section to out-file 24 EOF 25 exit 1 26 } 27 28 do_strip() { 29 "${CROSS_COMPILE}strip" --strip-all "${infile}" -o "${outfile}.tmp" 30 } 31 32 do_strip_keep_symbols() { 33 "${CROSS_COMPILE}objcopy" "${infile}" "${outfile}.tmp" \ 34 `"${CROSS_COMPILE}readelf" -S "${infile}" | awk '/.debug_/ {print "-R " $2}' | xargs` 35 } 36 37 do_strip_keep_mini_debug_info() { 38 rm -f "${outfile}.dynsyms" "${outfile}.funcsyms" "${outfile}.keep_symbols" "${outfile}.debug" "${outfile}.mini_debuginfo" "${outfile}.mini_debuginfo.xz" 39 if "${CROSS_COMPILE}strip" --strip-all -R .comment "${infile}" -o "${outfile}.tmp"; then 40 "${CROSS_COMPILE}objcopy" --only-keep-debug "${infile}" "${outfile}.debug" 41 "${CROSS_COMPILE}nm" -D "${infile}" --format=posix --defined-only | awk '{ print $$1 }' | sort >"${outfile}.dynsyms" 42 "${CROSS_COMPILE}nm" "${infile}" --format=posix --defined-only | awk '{ if ($$2 == "T" || $$2 == "t" || $$2 == "D") print $$1 }' | sort > "${outfile}.funcsyms" 43 comm -13 "${outfile}.dynsyms" "${outfile}.funcsyms" > "${outfile}.keep_symbols" 44 "${CROSS_COMPILE}objcopy" --rename-section .debug_frame=saved_debug_frame "${outfile}.debug" "${outfile}.mini_debuginfo" 45 "${CROSS_COMPILE}objcopy" -S --remove-section .gdb_index --remove-section .comment --keep-symbols="${outfile}.keep_symbols" "${outfile}.mini_debuginfo" 46 "${CROSS_COMPILE}objcopy" --rename-section saved_debug_frame=.debug_frame "${outfile}.mini_debuginfo" 47 xz "${outfile}.mini_debuginfo" 48 "${CROSS_COMPILE}objcopy" --add-section .gnu_debugdata="${outfile}.mini_debuginfo.xz" "${outfile}.tmp" 49 else 50 cp -f "${infile}" "${outfile}.tmp" 51 fi 52 } 53 54 do_add_gnu_debuglink() { 55 "${CROSS_COMPILE}objcopy" --add-gnu-debuglink="${infile}" "${outfile}.tmp" 56 } 57 58 while getopts $OPTSTRING opt; do 59 case "$opt" in 60 d) depsfile="${OPTARG}" ;; 61 i) infile="${OPTARG}" ;; 62 o) outfile="${OPTARG}" ;; 63 -) 64 case "${OPTARG}" in 65 keep-symbols) keep_symbols=true ;; 66 keep-mini-debug-info) keep_mini_debug_info=true ;; 67 add-gnu-debuglink) add_gnu_debuglink=true ;; 68 *) echo "Unknown option --${OPTARG}"; usage ;; 69 esac;; 70 ?) usage ;; 71 *) echo "'${opt}' '${OPTARG}'" 72 esac 73 done 74 75 if [ -z "${infile}" ]; then 76 echo "-i argument is required" 77 usage 78 fi 79 80 if [ -z "${outfile}" ]; then 81 echo "-o argument is required" 82 usage 83 fi 84 85 if [ -z "${depsfile}" ]; then 86 echo "-d argument is required" 87 usage 88 fi 89 90 if [ ! -z "${keep_symbols}" -a ! -z "${keep_mini_debug_info}" ]; then 91 echo "--keep-symbols and --keep-mini-debug-info cannot be used together" 92 usage 93 fi 94 95 if [ ! -z "${add_gnu_debuglink}" -a ! -z "${keep_mini_debug_info}" ]; then 96 echo "--add-gnu-debuglink cannot be used with --keep-mini-debug-info" 97 usage 98 fi 99 100 rm -f "${outfile}.tmp" 101 102 if [ ! -z "${keep_symbols}" ]; then 103 do_strip_keep_symbols 104 elif [ ! -z "${keep_mini_debug_info}" ]; then 105 do_strip_keep_mini_debug_info 106 else 107 do_strip 108 fi 109 110 if [ ! -z "${add_gnu_debuglink}" ]; then 111 do_add_gnu_debuglink 112 fi 113 114 rm -f "${outfile}" 115 mv "${outfile}.tmp" "${outfile}" 116 117 cat <<EOF > "${depsfile}" 118 ${outfile}: \ 119 ${infile} \ 120 ${CROSS_COMPILE}nm \ 121 ${CROSS_COMPILE}objcopy \ 122 ${CROSS_COMPILE}readelf \ 123 ${CROSS_COMPILE}strip 124 125 EOF 126
