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 * 2010-03-30 Kyle First version
9 */
10
11 #include <rtthread.h>
12
13 /**
14 * @addtogroup AVR32UC3
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, rt_uint8_t *stack_addr, void *texit)
29 {
30 unsigned long *stk;
31
32 stk = (unsigned long *)stack_addr;
33 *(stk) = 0; /* r8 */
34 *(--stk) = 0; /* r9 */
35 *(--stk) = 0; /* r10 */
36 *(--stk) = 0; /* r11 */
37 *(--stk) = 0; /* r12 */
38 *(--stk) = (unsigned long)texit; /* lr */
39 *(--stk) = (unsigned long)tentry; /* entry point, pc */
40 *(--stk) = 0x00600000; /* sr */
41 *(--stk) = 0; /* r0 */
42 *(--stk) = 0; /* r1 */
43 *(--stk) = 0; /* r2 */
44 *(--stk) = 0; /* r3 */
45 *(--stk) = 0; /* r4 */
46 *(--stk) = 0; /* r5 */
47 *(--stk) = 0; /* r6 */
48 *(--stk) = 0; /* r7 */
49
50 /* return task's current stack address */
51 return (rt_uint8_t *)stk;
52 }
53
54 /*@}*/
55