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;
}
/*@}*/