64 lines
2.0 KiB
C
64 lines
2.0 KiB
C
/*
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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) 2006, 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://openlab.rt-thread.com/license/LICENSE
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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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#define SVCMODE 0x13
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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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