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147 lines
2.9 KiB
147 lines
2.9 KiB
#!/bin/sh |
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# SPDX-License-Identifier: GPL-2.0 |
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# Disassemble the Code: line in Linux oopses |
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# usage: decodecode < oops.file |
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# |
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# options: set env. variable AFLAGS=options to pass options to "as"; |
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# e.g., to decode an i386 oops on an x86_64 system, use: |
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# AFLAGS=--32 decodecode < 386.oops |
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# PC=hex - the PC (program counter) the oops points to |
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cleanup() { |
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rm -f $T $T.s $T.o $T.oo $T.aa $T.dis |
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exit 1 |
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} |
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die() { |
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echo "$@" |
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exit 1 |
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} |
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trap cleanup EXIT |
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T=`mktemp` || die "cannot create temp file" |
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code= |
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cont= |
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while read i ; do |
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case "$i" in |
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*Code:*) |
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code=$i |
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cont=yes |
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;; |
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*) |
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[ -n "$cont" ] && { |
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xdump="$(echo $i | grep '^[[:xdigit:]<>[:space:]]\+$')" |
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if [ -n "$xdump" ]; then |
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code="$code $xdump" |
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else |
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cont= |
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fi |
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} |
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;; |
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esac |
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done |
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if [ -z "$code" ]; then |
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rm $T |
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exit |
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fi |
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echo $code |
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code=`echo $code | sed -e 's/.*Code: //'` |
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width=`expr index "$code" ' '` |
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width=$((($width-1)/2)) |
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case $width in |
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1) type=byte ;; |
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2) type=2byte ;; |
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4) type=4byte ;; |
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esac |
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if [ -z "$ARCH" ]; then |
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case `uname -m` in |
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aarch64*) ARCH=arm64 ;; |
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arm*) ARCH=arm ;; |
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esac |
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fi |
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# Params: (tmp_file, pc_sub) |
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disas() { |
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t=$1 |
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pc_sub=$2 |
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${CROSS_COMPILE}as $AFLAGS -o $t.o $t.s > /dev/null 2>&1 |
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if [ "$ARCH" = "arm" ]; then |
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if [ $width -eq 2 ]; then |
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OBJDUMPFLAGS="-M force-thumb" |
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fi |
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${CROSS_COMPILE}strip $t.o |
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fi |
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if [ "$ARCH" = "arm64" ]; then |
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if [ $width -eq 4 ]; then |
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type=inst |
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fi |
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${CROSS_COMPILE}strip $t.o |
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fi |
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if [ $pc_sub -ne 0 ]; then |
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if [ $PC ]; then |
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adj_vma=$(( $PC - $pc_sub )) |
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OBJDUMPFLAGS="$OBJDUMPFLAGS --adjust-vma=$adj_vma" |
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fi |
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fi |
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${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $t.o | \ |
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grep -v "/tmp\|Disassembly\|\.text\|^$" > $t.dis 2>&1 |
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} |
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marker=`expr index "$code" "\<"` |
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if [ $marker -eq 0 ]; then |
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marker=`expr index "$code" "\("` |
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fi |
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touch $T.oo |
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if [ $marker -ne 0 ]; then |
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# 2 opcode bytes and a single space |
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pc_sub=$(( $marker / 3 )) |
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echo All code >> $T.oo |
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echo ======== >> $T.oo |
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beforemark=`echo "$code"` |
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echo -n " .$type 0x" > $T.s |
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echo $beforemark | sed -e 's/ /,0x/g; s/[<>()]//g' >> $T.s |
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disas $T $pc_sub |
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cat $T.dis >> $T.oo |
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rm -f $T.o $T.s $T.dis |
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# and fix code at-and-after marker |
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code=`echo "$code" | cut -c$((${marker} + 1))-` |
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fi |
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echo Code starting with the faulting instruction > $T.aa |
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echo =========================================== >> $T.aa |
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code=`echo $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` |
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echo -n " .$type 0x" > $T.s |
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echo $code >> $T.s |
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disas $T 0 |
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cat $T.dis >> $T.aa |
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# (lines of whole $T.oo) - (lines of $T.aa, i.e. "Code starting") + 3, |
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# i.e. the title + the "===..=" line (sed is counting from 1, 0 address is |
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# special) |
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faultlinenum=$(( $(wc -l $T.oo | cut -d" " -f1) - \ |
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$(wc -l $T.aa | cut -d" " -f1) + 3)) |
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faultline=`cat $T.dis | head -1 | cut -d":" -f2-` |
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faultline=`echo "$faultline" | sed -e 's/\[/\\\[/g; s/\]/\\\]/g'` |
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cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" |
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echo |
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cat $T.aa |
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cleanup
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