60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
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/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2006-08-23 Bernard the first version
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*/
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#include <rtthread.h>
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#include "AT91SAM7S.h"
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/**
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* @addtogroup AT91SAM7
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*/
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/*@{*/
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/**
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* This function will initialize thread stack
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*
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* @param tentry the entry of thread
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* @param parameter the parameter of entry
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* @param stack_addr the beginning stack address
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* @param texit the function will be called when thread exit
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*
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* @return stack address
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*/
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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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stack_addr += sizeof(rt_uint32_t);
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stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8);
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stk = (rt_uint32_t *)stack_addr;
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*(--stk) = (rt_uint32_t)tentry; /* entry point */
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*(--stk) = (rt_uint32_t)texit; /* lr */
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*(--stk) = 0xdeadbeef; /* r12 */
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*(--stk) = 0xdeadbeef; /* r11 */
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*(--stk) = 0xdeadbeef; /* r10 */
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*(--stk) = 0xdeadbeef; /* r9 */
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*(--stk) = 0xdeadbeef; /* r8 */
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*(--stk) = 0xdeadbeef; /* r7 */
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*(--stk) = 0xdeadbeef; /* r6 */
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*(--stk) = 0xdeadbeef; /* r5 */
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*(--stk) = 0xdeadbeef; /* r4 */
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*(--stk) = 0xdeadbeef; /* r3 */
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*(--stk) = 0xdeadbeef; /* r2 */
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*(--stk) = 0xdeadbeef; /* r1 */
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*(--stk) = (rt_uint32_t)parameter; /* r0 : argument */
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*(--stk) = SVCMODE; /* cpsr */
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*(--stk) = SVCMODE; /* spsr */
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/* return task's current stack address */
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return (rt_uint8_t *)stk;
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}
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/*@}*/
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