Add up_saveusercontext

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1169 42af7a65-404d-4744-a932-0658087f49c3

2 files changed, 124 insertions, 1 deletions

diff --git a/nuttx/arch/sh/src/sh1/Make.defs b/nuttx/arch/sh/src/sh1/Make.defs
index 7ba6f0d7a..faa9d8562 100644
--- a/nuttx/arch/sh/src/sh1/Make.defs
+++ b/nuttx/arch/sh/src/sh1/Make.defs
@@ -46,7 +46,7 @@ ifneq ($(CONFIG_DISABLE_SIGNALS),y)
 CMN_CSRCS	+= up_schedulesigaction.c up_sigdeliver.c
 endif
 
-CHIP_ASRCS	= sh1_vector.S
+CHIP_ASRCS	= sh1_vector.S sh1_saveusercontext.S
 CHIP_CSRCS	= sh1_lowputc.c sh1_irq.c sh1_timerisr.c sh1_serial.c
 
 ifeq ($(CONFIG_USBDEV),y)
diff --git a/nuttx/arch/sh/src/sh1/sh1_saveusercontext.S b/nuttx/arch/sh/src/sh1/sh1_saveusercontext.S
new file mode 100644
index 000000000..1a80cd642
--- /dev/null
+++ b/nuttx/arch/sh/src/sh1/sh1_saveusercontext.S
@@ -0,0 +1,123 @@
+/**************************************************************************
+ * arch/sh/src/sh1/sh1_saveusercontext.S
+ *
+ *   Copyright (C) 2008 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 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/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, R4 contains a reference to the register save structure
+	 * to populate.
+	 *
+	 * Save a nonzero value for R0 in the register save area.  This will
+	 * will be the apparent return value when a context switch back to
+	 * this thread is performed.
+	 */
+
+	mov	#1, r0
+	mov.l	r0, @r4
+
+	/* Move to the end of the structure so that we can use auto decrement */
+
+	add	#(XCPTCONTEXT_SIZE-4), r0
+
+	/* Save the necessary registers */
+
+	stc     sr, r0			/* Get and save the SR */
+	mov.l	r0, @-r4
+	sts.l	pr, @-r4		/* The return address is the restore PC */
+	mov.l	r15, @-r4
+	add	#-(4*3), r4		/* Skip of mach, macl, r4 */
+	stc.l	gbr, @-r4
+	sts.l	pr, @-r4
+
+	mov.l	r14, @-r4
+	mov.l	r13, @-r4
+	mov.l	r12, @-r4
+	mov.l	r11, @-r4
+	mov.l	r10, @-r4
+	mov.l	r9, @-r4
+	mov.l	r8, @-r4
+
+	/* Omit r1-r7.  They do not matter when saving user state..
+	 * the calling conventions do not require that the values of these
+	 * registers persist across function calls.
+	 */
+
+	/* And return zero */
+
+	rts
+	mov	#0, r0
+	.size	up_saveusercontext, . - up_saveusercontext
+	.end