5358db0b0e
This patch adds support for decoding ARM oopses to scripts/decodecode.
The following things are handled:
- ARCH and CROSS_COMPILE environment variables are respected.
- The Code: in x86 oopses is in bytes, while it is in either words (4
bytes) or halfwords for ARM.
- Some versions of ARM objdump refuse to disassemble instructions
generated by literal constants (".word 0x..."). The workaround is to
strip the object file first.
- The faulting instruction is marked (liked so) in ARM, but <like so>
in x86.
- ARM mnemonics may include characters such as [] which need to be
escaped before being passed to sed for the "<- trapping instruction"
substitution.
Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Michal Marek <mmarek@suse.cz>
98 lines
1.9 KiB
Bash
Executable file
98 lines
1.9 KiB
Bash
Executable file
#!/bin/sh
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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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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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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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;;
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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 $width in
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1) type=byte ;;
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2) type=2byte ;;
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4) type=4byte ;;
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esac
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disas() {
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${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s &> /dev/null
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if [ "$ARCH" == "arm" ]; then
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if [ $width == 2 ]; then
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OBJDUMPFLAGS="-M force-thumb"
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fi
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${CROSS_COMPILE}strip $1.o
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fi
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${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \
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grep -v "/tmp\|Disassembly\|\.text\|^$" &> $1.dis
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}
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marker=`expr index "$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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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
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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
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cat $T.dis >> $T.aa
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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 "s/\($faultline\)/\*\1 <-- trapping instruction/g"
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echo
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cat $T.aa
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cleanup
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