linux/arch/arm/boot/deflate_xip_data.sh
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   1#!/bin/sh
   2# SPDX-License-Identifier: GPL-2.0-only
   3
   4# XIP kernel .data segment compressor
   5#
   6# Created by:   Nicolas Pitre, August 2017
   7# Copyright:    (C) 2017  Linaro Limited
   8#
   9
  10# This script locates the start of the .data section in xipImage and
  11# substitutes it with a compressed version. The needed offsets are obtained
  12# from symbol addresses in vmlinux. It is expected that .data extends to
  13# the end of xipImage.
  14
  15set -e
  16
  17VMLINUX="$1"
  18XIPIMAGE="$2"
  19
  20DD="dd status=none"
  21
  22# Use "make V=1" to debug this script.
  23case "$KBUILD_VERBOSE" in
  24*1*)
  25        set -x
  26        ;;
  27esac
  28
  29sym_val() {
  30        # extract hex value for symbol in $1
  31        local val=$($NM "$VMLINUX" 2>/dev/null | sed -n "/ $1\$/{s/ .*$//p;q}")
  32        [ "$val" ] || { echo "can't find $1 in $VMLINUX" 1>&2; exit 1; }
  33        # convert from hex to decimal
  34        echo $((0x$val))
  35}
  36
  37__data_loc=$(sym_val __data_loc)
  38_edata_loc=$(sym_val _edata_loc)
  39base_offset=$(sym_val _xiprom)
  40
  41# convert to file based offsets
  42data_start=$(($__data_loc - $base_offset))
  43data_end=$(($_edata_loc - $base_offset))
  44
  45# Make sure data occupies the last part of the file.
  46file_end=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" "$XIPIMAGE")
  47if [ "$file_end" != "$data_end" ]; then
  48        printf "end of xipImage doesn't match with _edata_loc (%#x vs %#x)\n" \
  49               $(($file_end + $base_offset)) $_edata_loc 1>&2
  50        exit 1;
  51fi
  52
  53# be ready to clean up
  54trap 'rm -f "$XIPIMAGE.tmp"; exit 1' 1 2 3
  55
  56# substitute the data section by a compressed version
  57$DD if="$XIPIMAGE" count=$data_start iflag=count_bytes of="$XIPIMAGE.tmp"
  58$DD if="$XIPIMAGE"  skip=$data_start iflag=skip_bytes |
  59$KGZIP -9 >> "$XIPIMAGE.tmp"
  60
  61# replace kernel binary
  62mv -f "$XIPIMAGE.tmp" "$XIPIMAGE"
  63