80 lines
2.3 KiB
C
80 lines
2.3 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) 2006, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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* 2011-01-13 weety
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*/
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#include <rtthread.h>
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/*****************************/
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/* CPU Mode */
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/*****************************/
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#define USERMODE 0x10
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#define FIQMODE 0x11
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#define IRQMODE 0x12
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#define SVCMODE 0x13
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#define ABORTMODE 0x17
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#define UNDEFMODE 0x1b
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#define MODEMASK 0x1f
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#define NOINT 0xc0
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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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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) = 0; /* r12 */
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*(--stk) = 0; /* r11 */
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*(--stk) = 0; /* r10 */
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*(--stk) = 0; /* r9 */
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*(--stk) = 0; /* r8 */
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*(--stk) = 0; /* r7 */
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*(--stk) = 0; /* r6 */
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*(--stk) = 0; /* r5 */
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*(--stk) = 0; /* r4 */
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*(--stk) = 0; /* r3 */
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*(--stk) = 0; /* r2 */
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*(--stk) = 0; /* r1 */
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*(--stk) = (rt_uint32_t)parameter; /* r0 : argument */
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/* cpsr */
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if ((rt_uint32_t)tentry & 0x01)
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*(--stk) = SVCMODE | 0x20; /* thumb mode */
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else
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*(--stk) = SVCMODE; /* arm mode */
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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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