60 lines
2.8 KiB
C
60 lines
2.8 KiB
C
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/*
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* File : stack.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-04-09 fify the first version
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*
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* For : Renesas M16C
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* Toolchain : IAR's EW for M16C v3.401
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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_uint16_t *pstk16;
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rt_uint16_t flag;
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flag = 0x0040;
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pstk16 = (rt_uint16_t *)stack_addr;
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pstk16--;
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/* Simulate ISR entry */
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*pstk16-- = (flag & 0x00FF) /* ... The lowest byte of the FLAG register */
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| (((rt_uint32_t)tentry >> 8) & 0x00000F00) /* ... The highest nibble of the PC register */
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| ((flag << 4) & 0xF000); /* ... The highest nibble of the FLAG register */
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*pstk16-- = (((rt_uint32_t)tentry ) & 0x0000FFFF); /* ... The lowest bytes of the PC register */
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/* Save registers onto stack frame */
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*pstk16-- = (rt_uint16_t)0xFBFB; /* ... FB register */
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*pstk16-- = (rt_uint16_t)0x3B3B; /* ... SB register */
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*pstk16-- = (rt_uint16_t)0xA1A1; /* ... A1 register */
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*pstk16-- = (rt_uint16_t)0xA0A0; /* ... A0 register */
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*pstk16-- = (rt_uint16_t)0x3333; /* ... R3 register */
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*pstk16-- = (rt_uint32_t)parameter >> 16L; /* ... Pass argument in R2 register */
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*pstk16-- = (rt_uint32_t)parameter & 0x0000FFFFL; /* ... Pass argument in R1 register */
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*pstk16 = (rt_uint16_t)0x0000; /* ... R0 register */
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/* return task's current stack address */
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return (rt_uint8_t *)pstk16;
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}
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