[PATCH] score: Fix _ISR_Stack_area_end

[Sebastian Huber]

The _ISR_Stack_area_begin and _ISR_Stack_area_end symbols are in
different sections.  They must have the same alignment, otherwise the
following linker directive could separate them:

  *(SORT_BY_ALIGNMENT (SORT_BY_NAME (.rtemsstack*)))

Update #3799.
---
 cpukit/Makefile.am                     |  1 +
 cpukit/include/rtems/confdefs/percpu.h |  5 -----
 cpukit/score/src/isrstackareaend.c     | 36 ++++++++++++++++++++++++++++++++++
 3 files changed, 37 insertions(+), 5 deletions(-)
 create mode 100644 cpukit/score/src/isrstackareaend.c

diff --git a/cpukit/Makefile.am b/cpukit/Makefile.am
index 3af69bd615..1486a4156f 100644
--- a/cpukit/Makefile.am
+++ b/cpukit/Makefile.am
@@ -1014,6 +1014,7 @@ librtemscpu_a_SOURCES += score/src/chainnodecount.c
 librtemscpu_a_SOURCES += score/src/debugisthreaddispatchingallowed.c
 librtemscpu_a_SOURCES += score/src/interr.c
 librtemscpu_a_SOURCES += score/src/isr.c
+librtemscpu_a_SOURCES += score/src/isrstackareaend.c
 librtemscpu_a_SOURCES += score/src/wkspace.c
 librtemscpu_a_SOURCES += score/src/wkspaceisunifieddefault.c
 librtemscpu_a_SOURCES += score/src/wkstringduplicate.c
diff --git a/cpukit/include/rtems/confdefs/percpu.h b/cpukit/include/rtems/confdefs/percpu.h
index 730571b54a..a902b4735c 100644
--- a/cpukit/include/rtems/confdefs/percpu.h
+++ b/cpukit/include/rtems/confdefs/percpu.h
@@ -98,11 +98,6 @@ char _ISR_Stack_area_begin[
 ] RTEMS_ALIGNED( CPU_INTERRUPT_STACK_ALIGNMENT )
 RTEMS_SECTION( ".rtemsstack.interrupt.begin" );
 
-RTEMS_DEFINE_GLOBAL_SYMBOL_IN_SECTION(
-  _ISR_Stack_area_end,
-  ".rtemsstack.interrupt.end"
-);
-
 /* Thread stack size configuration */
 
 #ifndef CONFIGURE_MINIMUM_TASK_STACK_SIZE
diff --git a/cpukit/score/src/isrstackareaend.c b/cpukit/score/src/isrstackareaend.c
new file mode 100644
index 0000000000..9d48384b62
--- /dev/null
+++ b/cpukit/score/src/isrstackareaend.c
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+
+/*
+ * Copyright (C) 2020 embedded brains GmbH (http://www.embedded-brains.de)
+ *
+ * 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.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/score/isr.h>
+
+RTEMS_SECTION( ".rtemsstack.interrupt.end" )
+RTEMS_ALIGNED( CPU_INTERRUPT_STACK_ALIGNMENT )
+const char _ISR_Stack_area_end[ 0 ];
-- 
2.16.4