diff options
Diffstat (limited to 'scripts/decodecode')
| -rwxr-xr-x | scripts/decodecode | 157 |
1 files changed, 136 insertions, 21 deletions
diff --git a/scripts/decodecode b/scripts/decodecode index ba8b8d5834e6..8fe71c292381 100755 --- a/scripts/decodecode +++ b/scripts/decodecode @@ -1,4 +1,4 @@ -#!/bin/sh +#!/bin/bash # SPDX-License-Identifier: GPL-2.0 # Disassemble the Code: line in Linux oopses # usage: decodecode < oops.file @@ -6,6 +6,9 @@ # 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 $T.dis @@ -67,15 +70,19 @@ if [ -z "$ARCH" ]; then esac fi +# Params: (tmp_file, pc_sub) disas() { - ${CROSS_COMPILE}as $AFLAGS -o $1.o $1.s > /dev/null 2>&1 + 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 $1.o + ${CROSS_COMPILE}strip $t.o fi if [ "$ARCH" = "arm64" ]; then @@ -83,11 +90,116 @@ disas() { type=inst fi - ${CROSS_COMPILE}strip $1.o + ${CROSS_COMPILE}strip $t.o + fi + + if [ "$ARCH" = "riscv" ]; then + OBJDUMPFLAGS="-M no-aliases --section=.text -D" + ${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 $1.o | \ - grep -v "/tmp\|Disassembly\|\.text\|^$" > $1.dis 2>&1 + ${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" "\<"` @@ -97,36 +209,39 @@ 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 + + disas $T $pc_sub + cat $T.dis >> $T.oo - rm -f $T.o $T.s $T.dis -# and fix code at-and-after marker + get_faultlinenum "$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 $code | sed -e 's/ [<(]/ /;s/[>)] / /;s/ /,0x/g; s/[>)]$//'` +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 +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/" +cat $T.oo | sed -e "${faultlinenum}s/^\([^:]*:\)\(.*\)/\1\*\2\t\t<-- trapping instruction/" echo cat $T.aa cleanup |