Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 | #!/bin/sh # SPDX-License-Identifier: GPL-2.0 # Disassemble the Code: line in Linux oopses # usage: decodecode < oops.file # # options: set env. variable AFLAGS=options to pass options to "as"; # e.g., to decode an i386 oops on an x86_64 system, use: # AFLAGS=--32 decodecode < 386.oops # PC=hex - the PC (program counter) the oops points to cleanup() { rm -f $T $T.s $T.o $T.oo $T.aa $T.dis exit 1 } die() { echo "$@" exit 1 } trap cleanup EXIT T=`mktemp` || die "cannot create temp file" code= cont= while read i ; do case "$i" in *Code:*) code=$i cont=yes ;; *) [ -n "$cont" ] && { xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" if [ -n "$xdump" ]; then code="$code $xdump" else cont= fi } ;; esac done if [ -z "$code" ]; then rm $T exit fi echo $code code=`echo $code | sed -e 's/.*Code: //'` width=`expr index "$code" ' '` width=$((($width-1)/2)) case $width in 1) type=byte ;; 2) type=2byte ;; 4) type=4byte ;; esac if [ -z "$ARCH" ]; then case `uname -m` in aarch64*) ARCH=arm64 ;; arm*) ARCH=arm ;; esac fi # Params: (tmp_file, pc_sub) disas() { t=$1 pc_sub=$2 ${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1 if [ "$ARCH" = "arm" ]; then if [ $width -eq 2 ]; then OBJDUMPFLAGS="-M force-thumb" fi ${CROSS_COMPILE}strip $t.o fi if [ "$ARCH" = "arm64" ]; then if [ $width -eq 4 ]; then type=inst fi ${CROSS_COMPILE}strip $t.o fi if [ $pc_sub -ne 0 ]; then if [ $PC ]; then adj_vma=$(( $PC - $pc_sub )) OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma" fi fi ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \ grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1 } marker=`expr index "$code" "\<"` if [ $marker -eq 0 ]; then marker=`expr index "$code" "\("` fi touch $T.oo if [ $marker -ne 0 ]; then # 2 opcode bytes and a single space pc_sub=$(( $marker / 3 )) echo All code >> $T.oo echo ======== >> $T.oo beforemark=`echo "$code"` echo -n " .$type 0x" > $T.s echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s disas $T $pc_sub cat $T.dis >> $T.oo rm -f $T.o $T.s $T.dis # and fix code at-and-after marker code=`echo "$code" | cut -c$((${marker} + 1))-` fi echo Code starting with the faulting instruction > $T.aa echo =========================================== >> $T.aa code=`echo $code | sed -e 's/\r//;s/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` echo -n " .$type 0x" > $T.s echo $code >> $T.s disas $T 0 cat $T.dis >> $T.aa # (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, # i.e. the title + the "===..=" line (sed is counting from 1, 0 address is # special) faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ $(wc -l $T.aa | cut -d" " -f1) + 3)) faultline=`cat $T.dis | head -1 | cut -d":" -f2-` faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" echo cat $T.aa cleanup |