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diff --git a/docs/architecture/psa-migration/syms.sh b/docs/architecture/psa-migration/syms.sh
new file mode 100755
index 000000000..5c34b28d1
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+++ b/docs/architecture/psa-migration/syms.sh
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+#!/bin/sh
+#
+# Copyright The Mbed TLS Contributors
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Purpose
+#
+# Show symbols in the X.509 and TLS libraries that are defined in another
+# libmbedtlsXXX.a library. This is usually done to list Crypto dependencies.
+#
+# Usage:
+# - build the library with debug symbols and the config you're interested in
+#   (default, full minus MBEDTLS_USE_PSA_CRYPTO, full, etc.)
+# - run this script with the name of your config as the only argument
+
+set -eu
+
+# list mbedtls_ symbols of a given type in a static library
+syms() {
+    TYPE="$1"
+    FILE="$2"
+
+    nm "$FILE" | sed -n "s/[0-9a-f ]*${TYPE} \(mbedtls_.*\)/\1/p" | sort -u
+}
+
+# create listings for the given library
+list() {
+    NAME="$1"
+    FILE="library/libmbed${NAME}.a"
+    PREF="${CONFIG}-$NAME"
+
+    syms '[TRrD]' $FILE > ${PREF}-defined
+    syms U $FILE > ${PREF}-unresolved
+
+    diff ${PREF}-defined ${PREF}-unresolved \
+        | sed -n 's/^> //p' > ${PREF}-external
+    sed 's/mbedtls_\([^_]*\).*/\1/' ${PREF}-external \
+        | uniq -c | sort -rn > ${PREF}-modules
+
+    rm ${PREF}-defined ${PREF}-unresolved
+}
+
+CONFIG="${1:-unknown}"
+
+list x509
+list tls