#! /bin/bash

IFS=$'\n'

export LC_ALL=C

for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do

    dep_pfx="ksym"

    # For built-in kmods, "kernel()" syntax is used instead of "ksym()"

    printf "%s" "$module" | grep -v "^${RPM_BUILD_ROOT}/\?lib/modules/[1-9][^/]*/kernel" > /dev/null \

        || dep_pfx="kernel"

    tmpfile=""

    if [ "x${module%.ko}" = "x${module}" ]; then

        tmpfile=$(mktemp -t ${0##*/}.XXXXXX.ko)

        proc_bin=

        case "${module##*.}" in

        zst)

                proc_bin=zstd

                ;;

        xz)

                proc_bin=xz

                ;;

        bz2)

                proc_bin=bzip2

                ;;

        gz)

                proc_bin=gzip

                ;;

        esac

        [ -n "$proc_bin" ] || continue

        "$proc_bin" -d -c - < "$module" > "$tmpfile" || continue

        module="$tmpfile"

    fi

    if nm "$module" | grep -qE '^([0-9a-f]+) A __crc_(.+)' 2> /dev/null; then

        nm "$module" \

        | awk \

           -v 'dep_pfx='"$dep_pfx" \

           --non-decimal-data \

          'match($0, /^([0-9a-f]+) A __crc_(.+)/, a) { printf("%s(%s) = 0x%08x\n", dep_pfx, a[2], strtonum("0x" a[1])) }' \

        | sort -u

    else

        objdump -t "$module" \

        | sed -n 's/^[0-9a-f][0-9a-f]* g...... \(.*\)	[0-9a-f][0-9a-f]* __crc_.*$/\1/p' \

        | sort -u \

        | while read sectname; do

            [ -n "$sectname" ] || continue

            ELFSECTDATA=$(readelf -R "$sectname" "$module" | awk '/0x/{printf $2$3$4$5}')

            if [[ -n $(readelf -h $module | grep "little endian") ]]; then

                SECTDATA=$(echo $ELFSECTDATA | sed 's/\(..\)\(..\)\(..\)\(..\)/\4\3\2\1/g')

            else

                SECTDATA=$ELFSECTDATA

            fi

            objdump -t "$module" \

            | awk \

              -v 'dep_pfx='"$dep_pfx" \

              -v 'sectdata='"$SECTDATA" \

              --non-decimal-data \

              'match($0, /^([0-9a-f]+) g...... .*	[0-9a-f]+ __crc_(.*)$/, a) { printf("%s(%s) = 0x%08s\n", dep_pfx, a[2], substr(sectdata, (strtonum("0x" a[1]) * 2) + 1, 8)) }'

        done \

        | sort -u

    fi

    [ -z "$tmpfile" ] || rm -f -- "$tmpfile"

done