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Code Editor : decodecode
#!/bin/bash # 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 faultlinenum=1 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 ;; loongarch*) ARCH=loongarch ;; 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 $t.o fi if [ "$ARCH" = "riscv" ]; then OBJDUMPFLAGS="-M no-aliases --section=.text -D" ${CROSS_COMPILE}strip $t.o fi if [ "$ARCH" = "loongarch" ]; then ${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 } # Match the maximum number of opcode bytes from @op_bytes contained within # @opline # # Params: # @op_bytes: The string of bytes from the Code: line # @opline: The disassembled line coming from objdump # # Returns: # The max number of opcode bytes from the beginning of @op_bytes which match # the opcode bytes in the objdump line. get_substr_opcode_bytes_num() { local op_bytes=$1 local opline=$2 local retval=0 substr="" for opc in $op_bytes; do substr+="$opc" opcode="$substr" if [ "$ARCH" = "riscv" ]; then opcode=$(echo $opcode | tr ' ' '\n' | tac | tr -d '\n') fi # return if opcode bytes do not match @opline anymore if ! echo $opline | grep -q "$opcode"; then break fi # add trailing space substr+=" " retval=$((retval+1)) done return $retval } # Return the line number in objdump output to where the IP marker in the Code: # line points to # # Params: # @all_code: code in bytes without the marker # @dis_file: disassembled file # @ip_byte: The byte to which the IP points to get_faultlinenum() { local all_code="$1" local dis_file="$2" # num bytes including IP byte local num_bytes_ip=$(( $3 + 1 * $width )) # Add the two header lines (we're counting from 1). local retval=3 # remove marker all_code=$(echo $all_code | sed -e 's/[<>()]//g') while read line do get_substr_opcode_bytes_num "$all_code" "$line" ate_opcodes=$? if ! (( $ate_opcodes )); then continue fi num_bytes_ip=$((num_bytes_ip - ($ate_opcodes * $width) )) if (( $num_bytes_ip <= 0 )); then break fi # Delete matched opcode bytes from all_code. For that, compute # how many chars those opcodes are represented by and include # trailing space. # # a byte is 2 chars, ate_opcodes is also the number of trailing # spaces del_chars=$(( ($ate_opcodes * $width * 2) + $ate_opcodes )) all_code=$(echo $all_code | sed -e "s!^.\{$del_chars\}!!") let "retval+=1" done < $dis_file return $retval } marker=`expr index "$code" "\<"` if [ $marker -eq 0 ]; then marker=`expr index "$code" "\("` fi touch $T.oo if [ $marker -ne 0 ]; then # How many bytes to subtract from the program counter # in order to get to the beginning virtual address of the # Code: pc_sub=$(( (($marker - 1) / (2 * $width + 1)) * $width )) 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 >> $T.oo get_faultlinenum "$code" "$T.dis" $pc_sub faultlinenum=$? # and fix code at-and-after marker code=`echo "$code" | cut -c$((${marker} + 1))-` rm -f $T.o $T.s $T.dis 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 cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" echo cat $T.aa cleanup
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