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