backtrace

#! /bin/bash -e
# Hacked together by Thorsten von Eicken in 2019
XTENSA_GDB=~/.platformio/packages/toolchain-xtensa32/bin/xtensa-esp32-elf-gdb

# Validate commandline arguments
if [ -z "$1" ]; then
    echo "usage: $0 <elf file> [<backtrace-text>]" 1>&2
    echo "reads from stdin if no backtrace-text is specified" 2>&2
    exit 1
fi
elf="$1"
if ! [ -f $elf ]; then
    echo "ELF file not found ($elf)" 1>&2
    exit 1
fi

if [ -z "$2" ]; then
    echo "reading backtrace from stdin"
    bt=/dev/stdin
elif ! [ -f "$2" ]; then
    echo "Backtrace file not found ($2)" 1>&2
    exit 1
else
    bt=$2
fi

# Parse exception info and command backtrace
rePC='PC\s*:? (0x40[0-2][0-9A-Fa-f]*)'
reEA='EXCVADDR\s*: (0x40[0-2][0-9A-Fa-f]*)'
reBT='Backtrace:\s?(.*)'
reIN='^[0-9A-Fa-f:x ]+$'
reOT='[^0-9a-zA-Z](0x40[0-2][0-9A-Fa-f]{5})[^0-9a-zA-Z]'
inBT=0
declare -a REGS
BT=
while read p; do
    if [[ "$p" =~ $rePC ]]; then
        # PC      : 0x400d38fe  PS      : 0x00060630  A0      : 0x800d35a6  A1      : 0x3ffb1c50
        REGS+=(PC:${BASH_REMATCH[1]})
    elif [[ "$p" =~ $reEA ]]; then
        # EXCVADDR: 0x16000001  LBEG    : 0x400014fd  LEND    : 0x4000150d  LCOUNT  : 0xffffffff
        REGS+=(EXCVADDR:${BASH_REMATCH[1]})
    elif [[ "$p" =~ $reBT ]]; then
        # Backtrace: 0x400d38fe:0x3ffb1c50 0x400d35a3:0x3ffb1c90 0x400e40bf:0x3ffb1fb0
        BT="${BASH_REMATCH[1]}"
        # echo $BT
        inBT=1
    elif [[ $inBT ]]; then
        if [[ "$p" =~ $reIN ]]; then
            # backtrace continuation lines cut by terminal emulator
            # 0x400d38fe:0x3ffb1c50 0x400d35a3:0x3ffb1c90
            BT="$BT${BASH_REMATCH[0]}"
            # echo $BT
        else
            inBT=0
        fi
    elif [[ "$p" =~ $reOT ]]; then
        # other lines with addresses
        # A2      : 0x00000001  A3      : 0x00000000  A4      : 0x16000001  A5      : 0x31a07a28
        REGS+=(OTHER:${BASH_REMATCH[1]})
    fi
done <$bt

#echo "PC is ${PC}"
#echo "EA is ${EA}"
#echo "BT is ${BT}"

# Parse addresses in backtrace and add them to REGS
n=0
for stk in $BT; do
    # ex: 0x400d38fe:0x3ffb1c50
    # echo $stk ...
    if [[ $stk =~ (0x40[0-2][0-9A-Fa-f]+): ]]; then
        addr=${BASH_REMATCH[1]}
        REGS+=("BT-${n}:${addr}")
        # echo addr: $addr
    fi
    let "n=$n + 1"
    #[[ $n -gt 10 ]] && break
done

# Iterate through all addresses and ask GDB to print source info for each one
for reg in "${REGS[@]}"; do
    name=${reg%:*}
    addr=${reg#*:}
    # echo "Checking $name: $addr"
    info=$($XTENSA_GDB --batch $elf -ex "set listsize 1" -ex "l *$addr" -ex q 2>&1 |\
        sed -e 's;/[^ ]*/ESP32/;;' |\
        egrep -v "(No such file or directory)|(^$)") || true
    if [[ -n "$info" ]]; then echo "$name: $info"; fi
done