rt-thread/libcpu/unicore32/sep6200/stack.c

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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
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*
* SPDX-License-Identifier: Apache-2.0
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*
* Change Logs:
* Date Author Notes
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* 2013-7-14 Peng Fan sep6200 implementation
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*/
#include <rtthread.h>
#include <sep6200.h>
/**
* @addtogroup sep6200
*/
/*@{*/
/**
* 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,
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rt_uint8_t *stack_addr, void *texit)
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{
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rt_uint32_t *stk;
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stk = (rt_uint32_t*)stack_addr;
*(stk) = (rt_uint32_t)tentry; /* entry point */
*(--stk) = (rt_uint32_t)texit; /* lr */
*(--stk) = 0; /* r28 */
*(--stk) = 0; /* r27 */
*(--stk) = 0; /* r26 */
*(--stk) = 0; /* r25 */
*(--stk) = 0; /* r24 */
*(--stk) = 0; /* r23 */
*(--stk) = 0; /* r22 */
*(--stk) = 0; /* r21 */
*(--stk) = 0; /* r20 */
*(--stk) = 0; /* r19 */
*(--stk) = 0; /* r18 */
*(--stk) = 0; /* r17 */
*(--stk) = 0; /* r16 */
*(--stk) = 0; /* r15 */
*(--stk) = 0; /* r14 */
*(--stk) = 0; /* r13 */
*(--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) = Mode_PRIV; /* asr */
*(--stk) = Mode_PRIV; /* bsr */ /*why both PRIV do not need switch?*/
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/* return task's current stack address */
return (rt_uint8_t *)stk;
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}
/*@}*/