1 /* 2 * File : stack_ck802.c 3 * This file is part of RT-Thread RTOS 4 * COPYRIGHT (C) 2006 - 2017, RT-Thread Development Team 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Change Logs: 21 * Date Author Notes 22 * 2017-01-01 Urey first version 23 */ 24 25 #include <rtthread.h> 26 27 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit) 28 { 29 rt_uint32_t *stk = (rt_uint32_t *)stack_addr; 30 31 stk = (rt_uint32_t *)(stack_addr + sizeof(rt_uint32_t)); 32 stk = (rt_uint32_t *)RT_ALIGN_DOWN((rt_uint32_t)stk, 8); 33 34 *(--stk) = (rt_uint32_t)tentry; /* Entry Point */ 35 *(--stk) = (rt_uint32_t)0x80000150L; /* PSR */ 36 *(--stk) = (rt_uint32_t)texit; /* R15 (LR) (init value will cause fault if ever used) */ 37 *(--stk) = (rt_uint32_t)0x13131313L; /* R13 */ 38 *(--stk) = (rt_uint32_t)0x12121212L; /* R12 */ 39 *(--stk) = (rt_uint32_t)0x11111111L; /* R11 */ 40 *(--stk) = (rt_uint32_t)0x10101010L; /* R10 */ 41 *(--stk) = (rt_uint32_t)0x09090909L; /* R9 */ 42 *(--stk) = (rt_uint32_t)0x08080808L; /* R8 */ 43 *(--stk) = (rt_uint32_t)0x07070707L; /* R7 */ 44 *(--stk) = (rt_uint32_t)0x06060606L; /* R6 */ 45 *(--stk) = (rt_uint32_t)0x05050505L; /* R5 */ 46 *(--stk) = (rt_uint32_t)0x04040404L; /* R4 */ 47 *(--stk) = (rt_uint32_t)0x03030303L; /* R3 */ 48 *(--stk) = (rt_uint32_t)0x02020202L; /* R2 */ 49 *(--stk) = (rt_uint32_t)0x01010101L; /* R1 */ 50 *(--stk) = (rt_uint32_t)parameter; /* R0 : argument */ 51 52 /* return task's current stack address */ 53 return (rt_uint8_t *)stk; 54 } 55 56