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Project/Src/rt-thread/libcpu/avr32/uc3/stack.c

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+/*
+ * File      : stack.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2010, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2010-03-30     Kyle         First version
+ */
+#include <rtthread.h>
+
+/**
+ * @addtogroup AVR32UC3
+ */
+/*@{*/
+
+/**
+ * This function will initialize thread stack
+ *
+ * @param tentry the entry of thread
+ * @param parameter the parameter of entry
+ * @param stack_addr the beginning stack address
+ * @param texit the function will be called when thread exit
+ *
+ * @return stack address
+ */
+rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
+{
+	unsigned long *stk;
+
+	stk 	 = (unsigned long *)stack_addr;
+	*(stk)   = 0;							/* r8 */
+	*(--stk) = 0;							/* r9 */
+	*(--stk) = 0;							/* r10 */
+	*(--stk) = 0;							/* r11 */
+	*(--stk) = 0;							/* r12 */
+	*(--stk) = (unsigned long)texit;		/* lr */
+	*(--stk) = (unsigned long)tentry;		/* entry point, pc */
+	*(--stk) = 0x00600000;					/* sr */
+	*(--stk) = 0;							/* r0 */
+	*(--stk) = 0;							/* r1 */
+	*(--stk) = 0;							/* r2 */
+	*(--stk) = 0;							/* r3 */
+	*(--stk) = 0;							/* r4 */
+	*(--stk) = 0;							/* r5 */
+	*(--stk) = 0;							/* r6 */
+	*(--stk) = 0;							/* r7 */
+
+	/* return task's current stack address */
+	return (rt_uint8_t *)stk;
+}
+
+/*@}*/