The script decodecode can be used to disassemble the 'Code:' line written when an exception occurs.
The script is copied from Linux v4.16.
Signed-off-by: Heinrich Schuchardt xypron.glpk@gmx.de --- v3: new patch --- scripts/decodecode | 125 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 125 insertions(+) create mode 100755 scripts/decodecode
diff --git a/scripts/decodecode b/scripts/decodecode new file mode 100755 index 00000000000..9cef558528a --- /dev/null +++ b/scripts/decodecode @@ -0,0 +1,125 @@ +#!/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 + +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 + +disas() { + ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 + + if [ "$ARCH" = "arm" ]; then + if [ $width -eq 2 ]; then + OBJDUMPFLAGS="-M force-thumb" + fi + + ${CROSS_COMPILE}strip $1.o + fi + + if [ "$ARCH" = "arm64" ]; then + if [ $width -eq 4 ]; then + type=inst + fi + + ${CROSS_COMPILE}strip $1.o + fi + + ${CROSS_COMPILE}objdump $OBJDUMPFLAGS -S $1.o | \ + grep -v "/tmp|Disassembly|.text|^$" > $1.dis 2>&1 +} + +marker=`expr index "$code" "<"` +if [ $marker -eq 0 ]; then + marker=`expr index "$code" "("` +fi + +touch $T.oo +if [ $marker -ne 0 ]; then + 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 + 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 $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` +echo -n " .$type 0x" > $T.s +echo $code >> $T.s +disas $T +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