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authorpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2011-08-05 21:57:49 +0000
committerpatacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>2011-08-05 21:57:49 +0000
commitdc0299c4649815ba8b5740fc8b211dad1d7bc3bd (patch)
treeaad85b8a93bf5ca1c243fb8ec154dd7c0e0ccd2e /nuttx/arch/arm/src/armv7-m/up_switchcontext.S
parent8f0b435a518c39a6141bbf888aa4bcd879808d44 (diff)
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Name change: Change Cortex-M3 naming to ARMv7-M naming so support Cortex-M4
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3846 42af7a65-404d-4744-a932-0658087f49c3
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diff --git a/nuttx/arch/arm/src/armv7-m/up_switchcontext.S b/nuttx/arch/arm/src/armv7-m/up_switchcontext.S
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+/************************************************************************************
+ * arch/arm/src/armv7-m/up_switchcontext.S
+ *
+ * Copyright (C) 2009-2011 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/config.h>
+#include <arch/irq.h>
+
+#include "nvic.h"
+#include "svcall.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Global Symbols
+ ************************************************************************************/
+
+ .syntax unified
+ .thumb
+ .file "up_switchcontext.S"
+
+/************************************************************************************
+ * Macros
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: up_switchcontext
+ *
+ * Description:
+ * Save the current thread context and restore the specified context.
+ * Full prototype is:
+ *
+ * void up_switchcontext(uint32_t *saveregs, uint32_t *restoreregs);
+ *
+ * Return:
+ * None
+ *
+ ************************************************************************************/
+
+ .thumb_func
+ .globl up_switchcontext
+ .type up_switchcontext, function
+up_switchcontext:
+
+ /* Perform the System call with R0=1, R1=saveregs, R2=restoreregs */
+
+ mov r2, r1 /* R2: restoreregs */
+ mov r1, r0 /* R1: saveregs */
+ mov r0, #SYS_switch_context /* R0: context switch */
+ svc 0 /* Force synchronous SVCall (or Hard Fault) */
+
+ /* This call should not return */
+
+ bx lr /* Unnecessary ... will not return */
+ .size up_switchcontext, .-up_switchcontext
+ .end
+