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