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
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parent
c918810414
commit
c2590fe930
3 changed files with 41 additions and 21 deletions
3
rules.mk
3
rules.mk
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@ -219,9 +219,10 @@ else
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endif
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endif
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RSTRIP:= \
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export CROSS="$(TARGET_CROSS)"; \
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NM="$(TARGET_CROSS)nm" \
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STRIP="$(STRIP)" \
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STRIP_KMOD="$(TARGET_CROSS)strip --strip-unneeded -R .comment -R .pdr -R .mdebug.abi32 -R .note.gnu.build-id -R .gnu.attributes -R .reginfo -x" \
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STRIP_KMOD="$(SCRIPT_DIR)/strip-kmod.sh" \
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$(SCRIPT_DIR)/rstrip.sh
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endif
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@ -5,25 +5,6 @@
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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find_modparams() {
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FILE="$1"
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$NM "$FILE" | awk '
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BEGIN {
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FS=" "
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}
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($3 ~ /^__module_parm_/) && ($3 !~ /^__module_parm_desc/) {
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gsub(/__module_parm_/, "", $3)
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printf "-K " $3 " "
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}
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($2 ~ /r/) && ($3 ~ /__param_/) {
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gsub(/__param_/, "", $3)
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printf "-K " $3 " "
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}
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'
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}
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SELF=${0##*/}
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[ -z "$STRIP" ] && {
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@ -46,7 +27,7 @@ find $TARGETS -type f -a -exec file {} \; | \
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while read F S; do
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echo "$SELF: $F:$S"
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[ "${S}" = "relocatable" ] && {
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eval "$STRIP_KMOD -w -K '__param*' -K '__mod*' $(find_modparams "$F")$F"
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eval "$STRIP_KMOD $F"
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} || {
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b=$(stat -c '%a' $F)
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eval "$STRIP $F"
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38
scripts/strip-kmod.sh
Executable file
38
scripts/strip-kmod.sh
Executable file
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@ -0,0 +1,38 @@
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#!/usr/bin/env bash
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[ -n "$CROSS" ] || {
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echo "The variable CROSS must be set to point to the cross-compiler prefix"
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exit 1
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}
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MODULE="$1"
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[ "$#" -ne 1 ] && {
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echo "Usage: $0 <module>"
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exit 1
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}
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${CROSS}objcopy \
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--strip-unneeded \
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-R .comment \
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-R .pdr \
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-R .mdebug.abi32 \
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-R .note.gnu.build-id \
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-R .gnu.attributes \
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-R .reginfo \
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-G __this_module \
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-x "$MODULE" "$MODULE.tmp"
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${CROSS}nm "$MODULE.tmp" | awk '
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BEGIN {
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n = 0
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}
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$3 && $2 ~ /[brtd]/ && $3 !~ /\$LC/ {
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print "--redefine-sym "$3"=_"n;
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n = n + 1
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}
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' > "$MODULE.tmp1"
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${CROSS}objcopy `cat ${MODULE}.tmp1` ${MODULE}.tmp ${MODULE}.out
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mv "${MODULE}.out" "${MODULE}"
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rm -f "${MODULE}".t*
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