diff --git a/port/moonlight/CMakeLists.txt b/port/moonlight/CMakeLists.txt
index 5edf9da..ae2e4c6 100644
--- a/port/moonlight/CMakeLists.txt
+++ b/port/moonlight/CMakeLists.txt
@@ -3,11 +3,15 @@ set(THREADX4TGFS_ROOT ${CMAKE_CURRENT_SOURCE_DIR}/../..)
 set(MOONLIGHT_SRC_DIR ${MOONLIGHT_ROOT}/src)
 set(MOONLIGHT_INC_DIR ${MOONLIGHT_ROOT}/inc)
 
+if(NOT DEFINED MOONLIGHT_TRAP_SOURCE)
+  set(MOONLIGHT_TRAP_SOURCE ${MOONLIGHT_SRC_DIR}/trap_non_vectored.c)
+endif()
+
 set(MOONLIGHT_PLATFORM_SOURCES
   ${THREADX4TGFS_ROOT}/port/picolibc/port.c
   ${MOONLIGHT_SRC_DIR}/bootup.c
   ${MOONLIGHT_SRC_DIR}/board.c
-  ${MOONLIGHT_SRC_DIR}/trap_non_vectored.c
+  ${MOONLIGHT_TRAP_SOURCE}
   ${MOONLIGHT_SRC_DIR}/exception.c
   ${MOONLIGHT_SRC_DIR}/vector_table.c)
 
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 7c32ba0..53f201c 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -24,6 +24,18 @@ enable_testing()
 set(TARGET_MEM "ram_dram" CACHE STRING "memory map to use")
 set(CMAKE_EXECUTABLE_SUFFIX_C ".elf")
 
+set(MOONLIGHT_TRAP_SOURCE_INPUT ${THREADX4TGFS_ROOT}/port/moonlight/src/trap_non_vectored.c)
+set(MOONLIGHT_TRAP_SOURCE ${CMAKE_BINARY_DIR}/generated/trap_non_vectored.c)
+execute_process(
+  COMMAND bash ${CMAKE_CURRENT_LIST_DIR}/threadx/generate_trap_file.sh
+          ${MOONLIGHT_TRAP_SOURCE_INPUT}
+          ${MOONLIGHT_TRAP_SOURCE}
+  RESULT_VARIABLE MOONLIGHT_TRAP_GENERATE_RESULT
+)
+if(NOT MOONLIGHT_TRAP_GENERATE_RESULT EQUAL 0)
+  message(FATAL_ERROR "Failed to generate regression trap source")
+endif()
+
 add_subdirectory(${THREADX4TGFS_ROOT}/port/moonlight ${CMAKE_BINARY_DIR}/port/moonlight)
 
 function(setup_target TARGET)
diff --git a/test/threadx/generate_trap_file.sh b/test/threadx/generate_trap_file.sh
new file mode 100755
index 0000000..2bce871
--- /dev/null
+++ b/test/threadx/generate_trap_file.sh
@@ -0,0 +1,27 @@
+#!/bin/bash
+set -eu
+
+src="$1"
+dst="$2"
+
+extern_anchor='extern void _tx_timer_interrupt(void);'
+call_anchor='_tx_timer_interrupt();'
+
+line=$(grep -n -F "$extern_anchor" "$src" | head -n 1 | cut -d: -f1)
+if [ -z "$line" ]; then
+    echo "failed to find _tx_timer_interrupt declaration anchor in trap source" >&2
+    exit 1
+fi
+sed "${line}a\\
+extern void test_interrupt_dispatch(void);" "$src" > "$dst.tmp1"
+
+line=$(grep -n -F "$call_anchor" "$dst.tmp1" | head -n 1 | cut -d: -f1)
+if [ -z "$line" ]; then
+    echo "failed to find _tx_timer_interrupt call anchor in trap source" >&2
+    rm -f "$dst.tmp1"
+    exit 1
+fi
+mkdir -p "$(dirname "$dst")"
+sed "${line}i\\
+                test_interrupt_dispatch();" "$dst.tmp1" > "$dst"
+rm -f "$dst.tmp1"