llext: add movt/movw relocation test

Arch arm relocatate test covers:
R_ARM_ABS32: all tests
decode_thm_jumps -> relative jmp extension
decode_thm_movs -> movwmovt extension

Signed-off-by: Cedric Lescop <cedric.lescop@se.com>

tests/subsys/llext/simple/CMakeLists.txt

@@ -16,15 +16,25 @@ target_include_directories(app PRIVATE
 )
 
 if(NOT LOADER_BUILD_ONLY)
-# generate extension targets foreach extension given by name
-foreach(ext_name hello_world logging relative_jump object syscalls)
-  set(ext_src ${PROJECT_SOURCE_DIR}/src/${ext_name}_ext.c)
-  set(ext_bin ${ZEPHYR_BINARY_DIR}/${ext_name}.llext)
-  set(ext_inc ${ZEPHYR_BINARY_DIR}/include/generated/${ext_name}.inc)
-  add_llext_target(${ext_name}_ext
-    OUTPUT  ${ext_bin}
-    SOURCES ${ext_src}
-  )
-  generate_inc_file_for_target(app ${ext_bin} ${ext_inc})
-endforeach()
+
+  set(ext_basename ext_name hello_world logging relative_jump object syscalls)
+
+  if(CONFIG_ARM)
+    if(NOT CONFIG_CPU_CORTEX_M0 AND NOT CONFIG_CPU_CORTEX_M0PLUS AND NOT CONFIG_CPU_CORTEX_M1)
+      list(APPEND ext_basename movwmovt)
+    endif()
+  endif()
+
+  # generate extension targets foreach extension given by basename
+  foreach(${ext_basename})
+    set(ext_src ${PROJECT_SOURCE_DIR}/src/${ext_name}_ext.c)
+    set(ext_bin ${ZEPHYR_BINARY_DIR}/${ext_name}.llext)
+    set(ext_inc ${ZEPHYR_BINARY_DIR}/include/generated/${ext_name}.inc)
+    add_llext_target(${ext_name}_ext
+      OUTPUT  ${ext_bin}
+      SOURCES ${ext_src}
+    )
+    generate_inc_file_for_target(app ${ext_bin} ${ext_inc})
+  endforeach()
+
 endif()

tests/subsys/llext/simple/src/movwmovt_ext.c

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2024 Schneider Electric.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * This test is designed to test MOV.W and MOV.T instructions on ARM architectures.
+ * (except M0 & M0+, not supported)
+ */
+
+#include <stdint.h>
+#include <zephyr/llext/symbol.h>
+#include <zephyr/sys/printk.h>
+
+
+static void test_func(void)
+{
+	printk("%s\n", __func__);
+}
+
+void test_entry(void)
+{
+	test_func();
+
+	printk("test movwmovt\n");
+	__asm volatile ("movw r0, #:lower16:test_func");
+	__asm volatile ("movt r0, #:upper16:test_func");
+	__asm volatile ("blx r0");
+}
+LL_EXTENSION_SYMBOL(test_entry);