loadable exception support

apps/examples/hello/hello_main.c

@@ -67,6 +67,7 @@ int main(int argc, FAR char *argv[])
 int hello_main(int argc, char *argv[])
 #endif
 {
-	printf("Hello, World!!\n");
+	int b;
+	printf("Hello, World!! %d\n", __gnu_Unwind_Find_exidx(0, &b));
 	return 0;
 }

apps/examples/helloxx/helloxx_main.cxx

@@ -144,6 +144,21 @@ static CHelloWorld g_HelloWorld;
  * Name: helloxx_main
  ****************************************************************************/
 
+static void test_exception(void)
+{
+        printf("============ Test Exception =============================\n");
+        try
+        {
+                throw 5;
+        }
+
+        catch (int e)
+        {
+                printf("Catch exception\n");
+        }
+}
+
+
 extern "C"
 {
 	int helloxx_main(int argc, char *argv[])
@@ -172,8 +187,11 @@ extern "C"
 		printf("helloxx_main: Saying hello from the statically constructed instance\n");
 		g_HelloWorld.HelloWorld();
 #endif
-
+		
 		delete pHelloWorld;
+
+		test_exception();
+
 		return 0;
 	}
 }

apps/platform/gnu/Make.defs

@@ -56,6 +56,10 @@ ifeq ($(CONFIG_HAVE_CXXINITIALIZE),y)
 CSRCS += gnu_cxxinitialize.c
 endif
 
+ifeq ($(CONFIG_LIBCXX_EXCEPTION),y)
+CSRCS += gnu_unwind_find_exidx.c
+endif
+
 # Add the gnu/ sub-directory to the build
 
 VPATH += :gnu

apps/platform/gnu/gnu_unwind_find_exidx.c

@@ -0,0 +1,56 @@
+/****************************************************************************
+ *
+ * Copyright 2023 Samsung Electronics All Rights Reserved.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdbool.h>
+#include <elf32.h>
+#include <tinyara/elf.h>
+
+#include <unwind.h>
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+extern void *__exidx_start;
+extern void *__exidx_end;
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  __gnu_Unwind_Find_exidx
+ *
+ * Description:
+ *    This function is called (if exists) by the gcc generated unwind
+ *    run-time in order to retrieve an alternative .ARM.exidx Exception
+ *    index section.
+ *    This is the case for an ELF module loaded by the elf binary loader.
+ *    It is needed to support exception handling for loadable ELF modules.
+ *
+ ****************************************************************************/
+
+_Unwind_Ptr __gnu_Unwind_Find_exidx(_Unwind_Ptr return_address, int *nrecp)
+{
+      *nrecp = &__exidx_end - &__exidx_start;
+      return (_Unwind_Ptr)&__exidx_start;
+}