From c2590fe9309910c759a9b8a5dbcd7facffe8d982 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Mon, 20 Feb 2012 17:38:26 +0000 Subject: [PATCH] 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 --- rules.mk | 3 ++- scripts/rstrip.sh | 21 +-------------------- scripts/strip-kmod.sh | 38 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+), 21 deletions(-) create mode 100755 scripts/strip-kmod.sh diff --git a/rules.mk b/rules.mk index 474c0e2461..79a2a9fa48 100644 --- a/rules.mk +++ b/rules.mk @@ -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 diff --git a/scripts/rstrip.sh b/scripts/rstrip.sh index e42caa53a2..4665ff5559 100755 --- a/scripts/rstrip.sh +++ b/scripts/rstrip.sh @@ -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 $F" diff --git a/scripts/strip-kmod.sh b/scripts/strip-kmod.sh new file mode 100755 index 0000000000..68da9e901b --- /dev/null +++ b/scripts/strip-kmod.sh @@ -0,0 +1,38 @@ +#!/usr/bin/env bash +[ -n "$CROSS" ] || { + echo "The variable CROSS must be set to point to the cross-compiler prefix" + exit 1 +} + +MODULE="$1" + +[ "$#" -ne 1 ] && { + echo "Usage: $0 " + exit 1 +} + +${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*