66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
|
|
* File : stack.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2011, 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
|
|
* 2011-09-23 Bernard the first version
|
|
* 2011-10-05 Bernard add thumb mode
|
|
*/
|
|
#include <rtthread.h>
|
|
#include <board.h>
|
|
|
|
/**
|
|
* @addtogroup AM33xx
|
|
*/
|
|
/*@{*/
|
|
|
|
/**
|
|
* 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 */
|
|
|
|
/* cpsr */
|
|
if ((rt_uint32_t)tentry & 0x01)
|
|
*(--stk) = SVCMODE | 0x20; /* thumb mode */
|
|
else
|
|
*(--stk) = SVCMODE; /* arm mode */
|
|
|
|
/* return task's current stack address */
|
|
return (rt_uint8_t *)stk;
|
|
}
|
|
|
|
/*@}*/
|