rt-thread/libcpu/arm/at91sam926x/stack.c

/*
 * File      : stack.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006, 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://openlab.rt-thread.com/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2011-01-13     weety      copy from mini2440
 */
#include <rtthread.h>
#include "at91sam926x.h"

/**
 * @addtogroup AT91SAM926X
 */
/*@{*/

/**
 * 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)
{
	rt_uint32_t *stk;

	stk 	 = (rt_uint32_t*)stack_addr;
	*(stk) 	 = (rt_uint32_t)tentry;			/* entry point */
	*(--stk) = (rt_uint32_t)texit;			/* lr */
	*(--stk) = 0;							/* r12 */
	*(--stk) = 0;							/* r11 */
	*(--stk) = 0;							/* r10 */
	*(--stk) = 0;							/* r9 */
	*(--stk) = 0;							/* r8 */
	*(--stk) = 0;							/* r7 */
	*(--stk) = 0;							/* r6 */
	*(--stk) = 0;							/* r5 */
	*(--stk) = 0;							/* r4 */
	*(--stk) = 0;							/* r3 */
	*(--stk) = 0;							/* r2 */
	*(--stk) = 0;							/* r1 */
	*(--stk) = (rt_uint32_t)parameter;		/* r0 : argument */
	*(--stk) = SVCMODE;						/* cpsr */
	*(--stk) = SVCMODE;						/* spsr */

	/* return task's current stack address */
	return (rt_uint8_t *)stk;
}

/*@}*/