/* * File : stack.c * This file is part of RT-Thread RTOS * COPYRIGHT (C) 2006-2011, RT-Thread Development Team * * The license and distribution terms for this file may be * found in the file LICENSE in this distribution or at * http://www.rt-thread.org/license/LICENSE * * Change Logs: * Date Author Notes * 2011-02-14 aozima first implementation for Nios II. */ #include <rtthread.h> /** * @addtogroup NIOS_II */ /*@{*/ /** * This function will initialize thread stack * * @param tentry the entry of thread * @param parameter the parameter of entry * @param stack_addr the beginning stack address * @param texit the function will be called when thread exit * * @return stack address */ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit) { unsigned long *stk; stk = (unsigned long *)stack_addr; *(stk) = 0x01; /* status */ *(--stk) = (unsigned long)texit; /* ra */ *(--stk) = 0xdeadbeef; /* fp */ *(--stk) = 0xdeadbeef; /* r23 */ *(--stk) = 0xdeadbeef; /* r22 */ *(--stk) = 0xdeadbeef; /* r21 */ *(--stk) = 0xdeadbeef; /* r20 */ *(--stk) = 0xdeadbeef; /* r19 */ *(--stk) = 0xdeadbeef; /* r18 */ *(--stk) = 0xdeadbeef; /* r17 */ *(--stk) = 0xdeadbeef; /* r16 */ // *(--stk) = 0xdeadbeef; /* r15 */ // *(--stk) = 0xdeadbeef; /* r14 */ // *(--stk) = 0xdeadbeef; /* r13 */ // *(--stk) = 0xdeadbeef; /* r12 */ // *(--stk) = 0xdeadbeef; /* r11 */ // *(--stk) = 0xdeadbeef; /* r10 */ // *(--stk) = 0xdeadbeef; /* r9 */ // *(--stk) = 0xdeadbeef; /* r8 */ *(--stk) = 0xdeadbeef; /* r7 */ *(--stk) = 0xdeadbeef; /* r6 */ *(--stk) = 0xdeadbeef; /* r5 */ *(--stk) = (unsigned long)parameter; /* r4 argument */ *(--stk) = 0xdeadbeef; /* r3 */ *(--stk) = 0xdeadbeef; /* r2 */ *(--stk) = (unsigned long)tentry; /* pc */ // *(stk) = (unsigned long)tentry; /* thread entry (ra) */ // *(--stk) = (unsigned long)parameter; /* thread argument, r4 */ /* return task's current stack address */ return (rt_uint8_t *)stk; } /*@}*/