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/*
* File : stack_ck802.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
* 2017-01-01 Urey first version
*/
#include <rtthread.h>
rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit)
{
rt_uint32_t *stk = (rt_uint32_t *)stack_addr;
stk = (rt_uint32_t *)(stack_addr + sizeof(rt_uint32_t));
stk = (rt_uint32_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8);
*(--stk) = (rt_uint32_t)tentry; /* Entry Point */
*(--stk) = (rt_uint32_t)0x80000150L; /* PSR */
*(--stk) = (rt_uint32_t)texit; /* R15 (LR) (init value will cause fault if ever used) */
*(--stk) = (rt_uint32_t)0x13131313L; /* R13 */
*(--stk) = (rt_uint32_t)0x12121212L; /* R12 */
*(--stk) = (rt_uint32_t)0x11111111L; /* R11 */
*(--stk) = (rt_uint32_t)0x10101010L; /* R10 */
*(--stk) = (rt_uint32_t)0x09090909L; /* R9 */
*(--stk) = (rt_uint32_t)0x08080808L; /* R8 */
*(--stk) = (rt_uint32_t)0x07070707L; /* R7 */
*(--stk) = (rt_uint32_t)0x06060606L; /* R6 */
*(--stk) = (rt_uint32_t)0x05050505L; /* R5 */
*(--stk) = (rt_uint32_t)0x04040404L; /* R4 */
*(--stk) = (rt_uint32_t)0x03030303L; /* R3 */
*(--stk) = (rt_uint32_t)0x02020202L; /* R2 */
*(--stk) = (rt_uint32_t)0x01010101L; /* R1 */
*(--stk) = (rt_uint32_t)parameter; /* R0 : argument */
/* return task's current stack address */
return (rt_uint8_t *)stk;
}
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