NuttX RTOS

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 121 insertions, 0 deletions

diff --git a/nuttx/arch/c5471/src/up_saveusercontext.S b/nuttx/arch/c5471/src/up_saveusercontext.S
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+/**************************************************************************
+ * up_saveusercontext.S
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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/irq.h>
+#include "up_internal.h"
+
+/**************************************************************************
+ * Private Definitions
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Types
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Function Prototypes
+ **************************************************************************/
+
+/**************************************************************************
+ * Global Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Variables
+ **************************************************************************/
+
+/**************************************************************************
+ * Private Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Public Functions
+ **************************************************************************/
+
+/**************************************************************************
+ * Name: up_saveusercontext
+ **************************************************************************/
+
+	.text
+	.globl	up_saveusercontext
+	.type	up_saveusercontext, function
+up_saveusercontext:
+	/* On entry, a1 (r0) holds address of struct xcptcontext.
+	 * Offset to the user region.
+	 */
+
+	/* Make sure that the return value will be non-zero (the
+	 * value of the other volatile registers don't matter --
+	 * r1-r3, ip).  This function is called throught the
+	 * noraml C calling conventions and the values of these
+	 * registers cannot be assumed at the point of setjmp
+	 * return.
+	 */
+
+        mov	ip, #1
+	str	ip, [r0, #JB_R0]
+
+	/* Get the offset to the user save area */
+
+	add	r0, r0, #XCPTCONTEXT_UOFFSET
+
+	/* Get the current cpsr as well */
+
+	mrs	r3, cpsr	/* R3 = CPSR value */
+
+	/* We need to save:
+	 *
+	 * Volatile register:	r3 (holds the cpsr value)
+	 * Static registers:	v1-v7 (aka r4-r10)
+	 * Frame pointer:	fp (aka r11)
+	 * Stack pointer:	sp (aka r13)
+	 * Return address:	lr (aka r14)
+	 *
+	 * These have to be save in the same order as is done
+	 * by the interrupt handling logic.
+	 */
+
+	stmia	r0, {r3-r11, r13-r14}
+
+	/* Return 0 */
+
+	mov	r0, #0		/* Return value == 0 */
+	mov	pc, lr		/* Return */
+	.size	up_saveusercontext, . - up_saveusercontext
+