94 lines
3.6 KiB
C
94 lines
3.6 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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* 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 copy from mini2440
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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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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; /* ra */
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*(--stk) = (rt_uint32_t)parameter; /* a0 */
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*(--stk) = 0xffffffff; /* a1 */
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*(--stk) = 0xffffffff; /* a2 */
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*(--stk) = 0xffffffff; /* a3 */
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*(--stk) = 0xffffffff; /* a4 */
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*(--stk) = 0xffffffff; /* a5 */
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*(--stk) = 0xffffffff; /* a6 */
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*(--stk) = 0xffffffff; /* a7 */
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*(--stk) = 0xffffffff; /* s0/fp */
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*(--stk) = 0xffffffff; /* s1 */
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*(--stk) = 0xffffffff; /* s2 */
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*(--stk) = 0xffffffff; /* s3 */
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*(--stk) = 0xffffffff; /* s4 */
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*(--stk) = 0xffffffff; /* s5 */
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*(--stk) = 0xffffffff; /* s6 */
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*(--stk) = 0xffffffff; /* s7 */
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*(--stk) = 0xffffffff; /* s8 */
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*(--stk) = 0xffffffff; /* s9 */
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*(--stk) = 0xffffffff; /* s10*/
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*(--stk) = 0xffffffff; /* s11*/
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*(--stk) = 0xffffffff; /* t0 */
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*(--stk) = 0xffffffff; /* t1 */
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*(--stk) = 0xffffffff; /* t2 */
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*(--stk) = 0xffffffff; /* t3 */
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*(--stk) = 0xffffffff; /* t4 */
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*(--stk) = 0xffffffff; /* t5 */
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*(--stk) = 0xffffffff; /* t6 */
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*(--stk) = 0xffffffff; /* tp */
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*(--stk) = 0xffffffff; /* gp */
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*(--stk) = 0x880; /* mie */
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// *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */
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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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