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Add an option to preserve symbols and debug_frame.

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New strip option named keep_symbols_and_debug_frame, that will keep the
symbols and the .debug_frame. This is meant for use by libc.so only on
arm32. Other libraries might want to use it to keep better unwinding
information on device.

Bug: 132992102

Test: Built libc.so with this option and verified that it contains
Test: the .debug_frame section.
Change-Id: I823a28199dec8316e8b26fe31ff9f17e6b11d406
This commit is contained in:
Christopher Ferris
2019-05-17 16:39:54 -07:00
parent 4c83b8950a
commit b43fe7a838
3 changed files with 46 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

34
scripts/strip.sh
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@@ -28,6 +28,7 @@
# --add-gnu-debuglink
# --keep-mini-debug-info
# --keep-symbols
# --keep-symbols-and-debug-frame
# --use-gnu-strip
# --remove-build-id
@@ -39,11 +40,12 @@ usage() {
cat <<EOF
Usage: strip.sh [options] -k symbols -i in-file -o out-file -d deps-file
Options:
--add-gnu-debuglink Add a gnu-debuglink section to out-file
--keep-mini-debug-info Keep compressed debug info in out-file
--keep-symbols Keep symbols in out-file
--use-gnu-strip Use strip/objcopy instead of llvm-{strip,objcopy}
--remove-build-id Remove the gnu build-id section in out-file
--add-gnu-debuglink Add a gnu-debuglink section to out-file
--keep-mini-debug-info Keep compressed debug info in out-file
--keep-symbols Keep symbols in out-file
--keep-symbols-and-debug-frame Keep symbols and .debug_frame in out-file
--use-gnu-strip Use strip/objcopy instead of llvm-{strip,objcopy}
--remove-build-id Remove the gnu build-id section in out-file
EOF
exit 1
}
@@ -63,6 +65,15 @@ do_strip() {
fi
}
do_strip_keep_symbols_and_debug_frame() {
REMOVE_SECTIONS=`"${CROSS_COMPILE}readelf" -S "${infile}" | awk '/.debug_/ {if ($2 != ".debug_frame") {print "--remove-section " $2}}' | xargs`
if [ -z "${use_gnu_strip}" ]; then
"${CLANG_BIN}/llvm-objcopy" "${infile}" "${outfile}.tmp" ${REMOVE_SECTIONS}
else
"${CROSS_COMPILE}objcopy" "${infile}" "${outfile}.tmp" ${REMOVE_SECTIONS}
fi
}
do_strip_keep_symbols() {
REMOVE_SECTIONS=`"${CROSS_COMPILE}readelf" -S "${infile}" | awk '/.debug_/ {print "--remove-section " $2}' | xargs`
if [ -z "${use_gnu_strip}" ]; then
@@ -148,6 +159,7 @@ while getopts $OPTSTRING opt; do
add-gnu-debuglink) add_gnu_debuglink=true ;;
keep-mini-debug-info) keep_mini_debug_info=true ;;
keep-symbols) keep_symbols=true ;;
keep-symbols-and-debug-frame) keep_symbols_and_debug_frame=true ;;
remove-build-id) remove_build_id=true ;;
use-gnu-strip) use_gnu_strip=true ;;
*) echo "Unknown option --${OPTARG}"; usage ;;
@@ -177,6 +189,16 @@ if [ ! -z "${keep_symbols}" -a ! -z "${keep_mini_debug_info}" ]; then
usage
fi
if [ ! -z "${keep_symbols}" -a ! -z "${keep_symbols_and_debug_frame}" ]; then
echo "--keep-symbols and --keep-symbols-and-debug-frame cannot be used together"
usage
fi
if [ ! -z "${keep_mini_debug_info}" -a ! -z "${keep_symbols_and_debug_frame}" ]; then
echo "--keep-symbols-mini-debug-info and --keep-symbols-and-debug-frame cannot be used together"
usage
fi
if [ ! -z "${symbols_to_keep}" -a ! -z "${keep_symbols}" ]; then
echo "--keep-symbols and -k cannot be used together"
usage
@@ -195,6 +217,8 @@ elif [ ! -z "${symbols_to_keep}" ]; then
do_strip_keep_symbol_list
elif [ ! -z "${keep_mini_debug_info}" ]; then
do_strip_keep_mini_debug_info
elif [ ! -z "${keep_symbols_and_debug_frame}" ]; then
do_strip_keep_symbols_and_debug_frame
else
do_strip
fi