92 lines
2.7 KiB
Bash
Executable File
92 lines
2.7 KiB
Bash
Executable File
#! /bin/bash
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IFS=$'\n'
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export LC_ALL=C
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# Prevent elfutils from trying to download debuginfos
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unset DEBUGINFOD_URLS
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for module in $(grep -E '/lib/modules/.+\.ko(\.gz|\.bz2|\.xz|\.zst)?$') "$@"; do
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dep_pfx="ksym"
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# For built-in kmods, "kernel()" syntax is used instead of "ksym()"
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printf "%s" "$module" | grep -v "^${RPM_BUILD_ROOT}/\?lib/modules/[1-9][^/]*/kernel" > /dev/null \
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|| dep_pfx="kernel"
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tmpfile=""
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if [ "x${module%.ko}" = "x${module}" ]; then
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tmpfile=$(mktemp -t ${0##*/}.XXXXXX.ko)
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proc_bin=
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case "${module##*.}" in
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zst)
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proc_bin=zstd
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;;
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xz)
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proc_bin=xz
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;;
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bz2)
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proc_bin=bzip2
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;;
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gz)
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proc_bin=gzip
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;;
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esac
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[ -n "$proc_bin" ] || continue
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"$proc_bin" -d -c - < "$module" > "$tmpfile" || continue
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module="$tmpfile"
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fi
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# awk script return code:
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# 0 - absolute __crc_* symbols have been found, output has been
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# generated;
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# 23 - a non-absolute __crc_* symbold has been found;
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# 42 - no __crc_* symbols have been found.
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nm "$module" \
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| awk \
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-v 'dep_pfx='"$dep_pfx" \
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--non-decimal-data \
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'BEGIN { exit_code = 42 }
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match($0, /^([0-9a-f]+) (.) __crc_(.+)/, a) {
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if (a[2] == "A") {
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printf("%s(%s) = 0x%08x\n", dep_pfx, a[3], strtonum("0x" a[1]));
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exit_code = 0;
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} else {
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exit_code = 23;
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exit;
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}
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}
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END { exit exit_code }'
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[ 23 = "$?" ] && {
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kmod_elf_hdr="$(readelf -h "$module")"
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[ "x$kmod_elf_hdr" = "x${kmod_elf_hdr%Data:*little endian*}" ]
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revbytes="$?"
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objdump -t "$module" \
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| awk \
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-v 'dep_pfx='"$dep_pfx" \
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-v 'module='"$module" \
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-v 'revbytes='"$revbytes" \
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--non-decimal-data \
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'function readsect(name, a, t) {
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a = "";
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while (("readelf -R \"" name "\" \"" module "\"" | getline t) > 0) {
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if (match(t, /^ 0x[0-9a-f]{8}/))
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a = a substr(t, 14, 8) substr(t, 23, 8) substr(t, 32, 8) substr(t, 41, 8);
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}
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if (revbytes) { a = gensub(/(..)(..)(..)(..)/, "\\4\\3\\2\\1", "g", a); }
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sectdata[name] = a;
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}
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match($0, /^([0-9a-f]+) [gl]...... (.*) [0-9a-f]+ __crc_(.*)$/, a) {
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if (!(a[2] in sectdata)) { readsect(a[2]) }
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printf("%s(%s) = 0x%08s\n", dep_pfx, a[3], substr(sectdata[a[2]], (strtonum("0x" a[1]) * 2) + 1, 8))
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}'
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}
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[ -z "$tmpfile" ] || rm -f -- "$tmpfile"
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done \
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| sort -k1,1 -u
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