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openwrt-xburst/scripts/strip-kmod.sh
nbd 2685b06017 strip kernel modules more aggressively: make all global symbols local, rename all symbols in the symbol table to make them compress better
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@30662 3c298f89-4303-0410-b956-a3cf2f4a3e73
2012-02-20 17:38:26 +00:00

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#!/usr/bin/env bash
[ -n "$CROSS" ] || {
echo "The variable CROSS must be set to point to the cross-compiler prefix"
exit 1
}
MODULE="$1"
[ "$#" -ne 1 ] && {
echo "Usage: $0 <module>"
exit 1
}
${CROSS}objcopy \
--strip-unneeded \
-R .comment \
-R .pdr \
-R .mdebug.abi32 \
-R .note.gnu.build-id \
-R .gnu.attributes \
-R .reginfo \
-G __this_module \
-x "$MODULE" "$MODULE.tmp"
${CROSS}nm "$MODULE.tmp" | awk '
BEGIN {
n = 0
}
$3 && $2 ~ /[brtd]/ && $3 !~ /\$LC/ {
print "--redefine-sym "$3"=_"n;
n = n + 1
}
' > "$MODULE.tmp1"
${CROSS}objcopy `cat ${MODULE}.tmp1` ${MODULE}.tmp ${MODULE}.out
mv "${MODULE}.out" "${MODULE}"
rm -f "${MODULE}".t*