cpukit: Add signal mapping support

This adds a confdef option allowing an application to request mapping
machine exceptions to POSIX signals. This is required for some languages
such as Ada.

2 files changed, 78 insertions, 0 deletions

diff --git a/cpukit/include/rtems/confdefs/extensions.h b/cpukit/include/rtems/confdefs/extensions.h
index 83d690d50a..6492407934 100644
--- a/cpukit/include/rtems/confdefs/extensions.h
+++ b/cpukit/include/rtems/confdefs/extensions.h
@@ -93,6 +93,10 @@
   #include <rtems/stackchk.h>
 #endif
 
+#ifdef CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING
+  #include <rtems/score/exception.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -103,6 +107,9 @@ extern "C" {
   || defined(CONFIGURE_INITIAL_EXTENSIONS) \
   || defined(BSP_INITIAL_EXTENSION)
   const User_extensions_Table _User_extensions_Initial_extensions[] = {
+    #ifdef CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING
+      { .fatal = _Exception_Raise_signal },
+    #endif
     #ifdef _CONFIGURE_RECORD_NEED_EXTENSION
       {
         #ifdef CONFIGURE_RECORD_EXTENSIONS_ENABLED
diff --git a/cpukit/include/rtems/score/exception.h b/cpukit/include/rtems/score/exception.h
new file mode 100644
index 0000000000..979a5aae7e
--- /dev/null
+++ b/cpukit/include/rtems/score/exception.h
@@ -0,0 +1,71 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/**
+ * @file
+ *
+ * @ingroup RTEMSScoreException
+ *
+ * @brief This header file provides the interfaces for mapping
+ *   exceptions to signsls.
+ */
+
+/*
+ * Copyright (C) 2021 On-Line Applications Research Corporation (OAR)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _RTEMS_EXCEPTION_H
+#define _RTEMS_EXCEPTION_H
+
+#include <rtems/fatal.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup RTEMSScoreException Exception Mapping Interfaces
+ *
+ * @ingroup RTEMSScore
+ *
+ * @brief This group contains the interfaces for mapping machine exceptions to
+ *   signals using the fatal error handler.
+ */
+
+/**
+ * @brief Handle an exception frame for the purpose of mapping signals
+ *
+ * See CONFIGURE_EXCEPTION_TO_SIGNAL_MAPPING documentation in the
+ * "RTEMS Classic API Guide".
+ */
+void _Exception_Raise_signal(
+  Internal_errors_Source source,
+  bool                   always_set_to_false,
+  Internal_errors_t      code
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTEMS_EXCEPTION_H */