strip kernel modules more aggressively: make all global symbols local, rename all symbols in the symbol table to make them compress better

SVN-Revision: 30662
This commit is contained in:
Felix Fietkau 2012-02-20 17:38:26 +00:00
parent c918810414
commit c2590fe930
3 changed files with 41 additions and 21 deletions

View file

@ -219,9 +219,10 @@ else
endif
endif
RSTRIP:= \
export CROSS="$(TARGET_CROSS)"; \
NM="$(TARGET_CROSS)nm" \
STRIP="$(STRIP)" \
STRIP_KMOD="$(TARGET_CROSS)strip --strip-unneeded -R .comment -R .pdr -R .mdebug.abi32 -R .note.gnu.build-id -R .gnu.attributes -R .reginfo -x" \
STRIP_KMOD="$(SCRIPT_DIR)/strip-kmod.sh" \
$(SCRIPT_DIR)/rstrip.sh
endif

View file

@ -5,25 +5,6 @@
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
find_modparams() {
FILE="$1"
$NM "$FILE" | awk '
BEGIN {
FS=" "
}
($3 ~ /^__module_parm_/) && ($3 !~ /^__module_parm_desc/) {
gsub(/__module_parm_/, "", $3)
printf "-K " $3 " "
}
($2 ~ /r/) && ($3 ~ /__param_/) {
gsub(/__param_/, "", $3)
printf "-K " $3 " "
}
'
}
SELF=${0##*/}
[ -z "$STRIP" ] && {
@ -46,7 +27,7 @@ find $TARGETS -type f -a -exec file {} \; | \
while read F S; do
echo "$SELF: $F:$S"
[ "${S}" = "relocatable" ] && {
eval "$STRIP_KMOD -w -K '__param*' -K '__mod*' $(find_modparams "$F")$F"
eval "$STRIP_KMOD $F"
} || {
b=$(stat -c '%a' $F)
eval "$STRIP $F"

38
scripts/strip-kmod.sh Executable file
View file

@ -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*