Incoporate new ARMv7-M exception handling logic contributed by Mike Smith

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4413 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 95 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/armv7-m/up_vectors.c b/nuttx/arch/arm/src/armv7-m/up_vectors.c
new file mode 100644
index 000000000..b85ac9246
--- /dev/null
+++ b/nuttx/arch/arm/src/armv7-m/up_vectors.c
@@ -0,0 +1,95 @@
+/****************************************************************************
+ * arch/arm/src/armv7-m/up_vectors.c
+ *
+ *   Copyright (C) 2012 Michael Smith. All rights reserved.
+ *
+ * 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+
+/************************************************************************************
+ * Preprocessor Definitions
+ ************************************************************************************/
+
+#define IDLE_STACK      ((unsigned)&_ebss+CONFIG_IDLETHREAD_STACKSIZE-4)
+
+#ifndef ARMV7M_PERIPHERAL_INTERRUPTS
+#  error ARMV7M_PERIPHERAL_INTERRUPTS must be defined to the number of I/O interrupts to be supported
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/* Chip-specific entrypoint */
+
+extern void __start(void);
+
+/* Common exception entrypoint */
+
+extern void exception_common(void);
+
+/************************************************************************************
+ * Public data
+ ************************************************************************************/
+
+/* Provided by the linker script to indicate the end of the BSS */
+
+extern char _ebss;
+
+/* The v7m vector table consists of an array of function pointers, with the first
+ * slot (vector zero) used to hold the initial stack pointer.
+ *
+ * As all exceptions (interrupts) are routed via exception_common, we just need to
+ * fill this array with pointers to it.
+ *
+ * Note that the [ ... ] desginated initialiser is a GCC extension.
+ */
+
+unsigned _vectors[] __attribute__((section(".vectors"))) = 
+  {
+    /* Initial stack */
+
+    IDLE_STACK,
+
+    /* Reset exception handler */
+
+    (unsigned)&__start,
+
+    /* Vectors 2 - n point directly at the generic handler */
+
+    [2 ... (15 + ARMV7M_PERIPHERAL_INTERRUPTS)] = (unsigned)&exception_common
+  };