1 /*
2 * Copyright (c) 2006-2022, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2011-02-14 aozima first implementation for Nios II.
9 */
10
11 #include <rtthread.h>
12
13 /**
14 * @addtogroup NIOS_II
15 */
16 /*@{*/
17
18 /**
19 * This function will initialize thread stack
20 *
21 * @param tentry the entry of thread
22 * @param parameter the parameter of entry
23 * @param stack_addr the beginning stack address
24 * @param texit the function will be called when thread exit
25 *
26 * @return stack address
27 */
rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)28 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter,
29 rt_uint8_t *stack_addr, void *texit)
30 {
31 unsigned long *stk;
32
33 stk = (unsigned long *)stack_addr;
34 *(stk) = 0x01; /* status */
35 *(--stk) = (unsigned long)texit; /* ra */
36 *(--stk) = 0xdeadbeef; /* fp */
37 *(--stk) = 0xdeadbeef; /* r23 */
38 *(--stk) = 0xdeadbeef; /* r22 */
39 *(--stk) = 0xdeadbeef; /* r21 */
40 *(--stk) = 0xdeadbeef; /* r20 */
41 *(--stk) = 0xdeadbeef; /* r19 */
42 *(--stk) = 0xdeadbeef; /* r18 */
43 *(--stk) = 0xdeadbeef; /* r17 */
44 *(--stk) = 0xdeadbeef; /* r16 */
45 // *(--stk) = 0xdeadbeef; /* r15 */
46 // *(--stk) = 0xdeadbeef; /* r14 */
47 // *(--stk) = 0xdeadbeef; /* r13 */
48 // *(--stk) = 0xdeadbeef; /* r12 */
49 // *(--stk) = 0xdeadbeef; /* r11 */
50 // *(--stk) = 0xdeadbeef; /* r10 */
51 // *(--stk) = 0xdeadbeef; /* r9 */
52 // *(--stk) = 0xdeadbeef; /* r8 */
53 *(--stk) = 0xdeadbeef; /* r7 */
54 *(--stk) = 0xdeadbeef; /* r6 */
55 *(--stk) = 0xdeadbeef; /* r5 */
56 *(--stk) = (unsigned long)parameter; /* r4 argument */
57 *(--stk) = 0xdeadbeef; /* r3 */
58 *(--stk) = 0xdeadbeef; /* r2 */
59 *(--stk) = (unsigned long)tentry; /* pc */
60
61 // *(stk) = (unsigned long)tentry; /* thread entry (ra) */
62 // *(--stk) = (unsigned long)parameter; /* thread argument, r4 */
63
64 /* return task's current stack address */
65 return (rt_uint8_t *)stk;
66 }
67
68 /*@}*/
69