1 | #! /bin/sh |
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2 | # |
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3 | # copyright - PKG.fr - 2008 |
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4 | # |
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5 | # This program is free software; you can redistribute it and/or modify |
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6 | # it under the terms of the GNU General Public License as published by |
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7 | # the Free Software Foundation; either version 2 of the License, or |
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8 | # (at your option) any later version. |
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9 | # |
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10 | # This program is distributed in the hope that it will be useful, |
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11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | # GNU Library General Public License for more details. |
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14 | # |
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15 | # You should have received a copy of the GNU General Public License |
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16 | # along with this program; if not, write to the Free Software |
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17 | # Foundation, Inc., 51 Franklin Street, Fifth Floor Boston, MA 02110-1301, USA |
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18 | |
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19 | echo |
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20 | echo "kernel extract v0.1" |
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21 | echo |
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22 | |
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23 | if [ ! -s "$1" ]; then |
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24 | echo "You must provide the extracted MTD file as first argument" |
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25 | exit 1 |
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26 | fi |
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27 | |
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28 | MTD="$1" |
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29 | BIN="$2" |
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30 | |
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31 | # Update BIN to default if not set |
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32 | : ${BIN:=uImage.bin} |
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33 | |
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34 | function get_int () { |
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35 | Hex="0x" |
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36 | let i=0 offset=$1 |
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37 | while (( i < 4 )) |
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38 | do |
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39 | Chr=$( dd if="$MTD" bs=1 count=1 skip=$((offset+i)) 2>/dev/null ) |
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40 | Chr=$( printf '%d' "'$Chr" ) |
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41 | #echo $Chr 1>&2 |
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42 | (( Chr < 0 )) && let Chr+=256 |
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43 | Hex="$Hex$( printf '%02lX' $Chr )" |
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44 | #echo $Hex 1>&2 |
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45 | let i++ |
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46 | done |
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47 | echo "$Hex" |
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48 | } |
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49 | |
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50 | function get_str () { |
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51 | Str="" |
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52 | let Ascii=1 offset=$1 |
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53 | while (( Ascii > 0 )) |
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54 | do |
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55 | Chr=$( dd if="$MTD" bs=1 count=1 skip=$((offset)) 2>/dev/null ) |
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56 | Ascii=$( printf '%d' "'$Chr" ) |
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57 | (( Ascii > 31 && Ascii < 127 )) && Str="$Str$Chr" |
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58 | (( ++offset >= 0x40 )) && break |
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59 | done |
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60 | echo "$Str" |
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61 | } |
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62 | |
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63 | # uImage.bin header used by u-boot |
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64 | MAGIC=$(get_int 0) |
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65 | HCRC=$(get_int 4) |
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66 | TIME=$(get_int 8) |
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67 | SIZE=$(get_int 12) |
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68 | ADDR=$(get_int 16) |
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69 | ADDS=$(get_int 20) |
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70 | DCRC=$(get_int 24) |
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71 | ARCH=$(get_int 28) |
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72 | VERS=$(get_str 32) |
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73 | |
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74 | printf "Magic=%s HCRC=%d Timestamp=%d DCRC=%d Arch=%s\n\n" $MAGIC $HCRC $TIME $DCRC $ARCH |
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75 | printf "Kernel size = %d\nKernel should be loaded at %s address, entry point is %s\n" $SIZE $ADDR $ADDS |
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76 | echo "Linux version: $VERS" |
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77 | echo |
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78 | |
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79 | if [ "$MAGIC" != "0x27051956" ]; then |
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80 | echo "Error: Found wrong magic value at offset 0" 1>&2 |
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81 | exit 4 |
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82 | fi |
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83 | |
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84 | TEST=$(get_int $(($INT1+0x40)) ) |
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85 | (( TEST )) && echo "Warning: bytes after the kernel are not null" |
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86 | |
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87 | if (( SIZE > 4096000 )); then |
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88 | echo "The kernel size seems too high, can't process" |
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89 | exit 2 |
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90 | fi |
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91 | |
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92 | # Keeping header to get uImage.bin |
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93 | let SIZE+=64 |
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94 | |
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95 | # Copy kernel with dd using 4 bytes block size to have minimum performance |
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96 | dd if=$MTD of=$BIN bs=4 count=$((SIZE/4)) |
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97 | |
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98 | echo |
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99 | CTRL=$( wc -c "$BIN" | cut -d ' ' -f 1 ) |
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100 | if [ "$CTRL" -eq "$((SIZE+64))" ]; then |
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101 | echo "Kernel extracted to '$BIN'" |
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102 | echo |
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103 | else |
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104 | echo "Kernel extraction failed ($CTRL!=$((SIZE)))" |
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105 | echo |
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106 | exit 3 |
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107 | fi |
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