1 /* 2 * File : stack.c 3 * This file is part of RT-Thread RTOS 4 * COPYRIGHT (C) 2006, RT-Thread Development Team 5 * 6 * The license and distribution terms for this file may be 7 * found in the file LICENSE in this distribution or at 8 * http://openlab.rt-thread.com/license/LICENSE 9 * 10 * Change Logs: 11 * Date Author Notes 12 * 2011-12-17 nl1031 first implementation for MicroBlaze. 13 * 14 */ 15 #include <rtthread.h> 16 extern void *_SDA_BASE_; 17 extern void *_SDA2_BASE_; 18 19 20 21 /** 22 * This function will initialize thread stack 23 * 24 * @param tentry the entry of thread 25 * @param parameter the parameter of entry 26 * @param stack_addr the beginning stack address 27 * @param texit the function will be called when thread exit 28 * 29 * @return stack address 30 */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)31rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 32 rt_uint8_t *stack_addr, void *texit) 33 { 34 unsigned long *stk; 35 36 stk = (unsigned long *)stack_addr; 37 stk--; 38 stk--; 39 *stk-- = 0; /* r31 */ 40 *stk-- = 0; /* r30 */ 41 *stk-- = 0; /* r29 */ 42 *stk-- = 0; /* r28 */ 43 *stk-- = 0; /* r27 */ 44 *stk-- = 0; /* r26 */ 45 *stk-- = 0; /* r25 */ 46 *stk-- = 0; /* r24 */ 47 *stk-- = 0; /* r23 */ 48 *stk-- = 0; /* r22 */ 49 *stk-- = 0; /* r21 */ 50 *stk-- = 0; /* r20 */ 51 *stk-- = 0; /* r19 */ 52 *stk-- = 0; /* r18 */ 53 *stk-- = 0; /* r17 */ 54 *stk-- = (unsigned long)texit - 8; /* r15 = task return address*/ 55 *stk-- = (unsigned long)tentry; /* r14 = entry address*/ 56 *stk-- = (unsigned long)&_SDA_BASE_; /* r13 */ 57 *stk-- = 0; /* r12 */ 58 *stk-- = 0; /* r11 */ 59 *stk-- = 0; /* r10 */ 60 *stk-- = 0; /* r09 */ 61 *stk-- = 0; /* r08 */ 62 *stk-- = 0; /* r07 */ 63 *stk-- = 0; /* r06 */ 64 *stk-- = (unsigned long) parameter; /* r05 */ 65 *stk-- = 0; /* r04 */ 66 *stk-- = 0; /* r03 */ 67 *stk-- = (unsigned long)&_SDA2_BASE_; /* r02 */ 68 *stk = 2; /* enable interrupt */ 69 return (rt_uint8_t *)stk; 70 } 71 72