strip kernel modules more aggressively: make all global symbols local, rename all...

[openwrt/svn-archive/archive.git] / scripts / strip-kmod.sh

diff --git a/scripts/strip-kmod.sh b/scripts/strip-kmod.sh
new file mode 100755 (executable)
index 0000000..68da9e9
--- /dev/null
+++ b/scripts/strip-kmod.sh
@@ -0,0 +1,38 @@
+#!/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*