name : deflate_xip_data.sh #!/bin/sh # SPDX-License-Identifier: GPL-2.0-only # XIP kernel .data segment compressor # # Created by: Nicolas Pitre, August 2017 # Copyright: (C) 2017 Linaro Limited # # This script locates the start of the .data section in xipImage and # substitutes it with a compressed version. The needed offsets are obtained # from symbol addresses in vmlinux. It is expected that .data extends to # the end of xipImage. set -e VMLINUX="$1" XIPIMAGE="$2" DD="dd status=none" # Use "make V=1" to debug this script. case "$KBUILD_VERBOSE" in *1*) set -x ;; esac sym_val() { # extract hex value for symbol in $1 local val=$($NM "$VMLINUX" 2>/dev/null | sed -n "/ $1\$/{s/ .*$//p;q}") [ "$val" ] || { echo "can't find $1 in $VMLINUX" 1>&2; exit 1; } # convert from hex to decimal echo $((0x$val)) } __data_loc=$(sym_val __data_loc) _edata_loc=$(sym_val _edata_loc) base_offset=$(sym_val _xiprom) # convert to file based offsets data_start=$(($__data_loc - $base_offset)) data_end=$(($_edata_loc - $base_offset)) # Make sure data occupies the last part of the file. file_end=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" "$XIPIMAGE") if [ "$file_end" != "$data_end" ]; then printf "end of xipImage doesn't match with _edata_loc (%#x vs %#x)\n" \ $(($file_end + $base_offset)) $_edata_loc 1>&2 exit 1; fi # be ready to clean up trap 'rm -f "$XIPIMAGE.tmp"; exit 1' 1 2 3 # substitute the data section by a compressed version $DD if="$XIPIMAGE" count=$data_start iflag=count_bytes of="$XIPIMAGE.tmp" $DD if="$XIPIMAGE" skip=$data_start iflag=skip_bytes | $KGZIP -9 >> "$XIPIMAGE.tmp" # replace kernel binary mv -f "$XIPIMAGE.tmp" "$XIPIMAGE"