65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
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/*
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* Copyright (c) 2020, Shenzhen Academy of Aerospace Technology
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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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* 2020-10-16 Dystopia the first version
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*/
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#include <rtthread.h>
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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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int window_index;
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int register_index;
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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 -= 24;
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stk -= 8;
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for (register_index = 0; register_index != 8; register_index++)
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stk[register_index] = 0xdeadbeef;
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for (window_index = 0; window_index != 8; window_index++)
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{
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stk -= 16;
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for (register_index = 0; register_index != 16; register_index++)
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stk[register_index] = 0xdeadbeef;
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if (window_index == 0)
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{
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stk[8] = (rt_uint32_t)parameter;
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stk[15] = (rt_uint32_t)texit - 8;
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}
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}
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stk -= 34;
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for (register_index = 0; register_index != 34; register_index++)
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stk[register_index] = 0;
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stk -= 4;
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stk[0] = (rt_uint32_t)tentry; //pc
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stk[1] = (rt_uint32_t)tentry + 4; //npc
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stk[2] = 0x10C7; //psr
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stk[3] = 0x2; //wim
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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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