1 /* 2 * Copyright (c) 2006-2021, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2011-09-23 Bernard the first version 9 * 2011-10-05 Bernard add thumb mode 10 */ 11 #include <rtthread.h> 12 #include <cpuport.h> 13 #include <board.h> 14 15 /** 16 * @addtogroup ARM Cortex-A 17 */ 18 /*@{*/ 19 20 /** 21 * This function will initialize thread stack 22 * 23 * @param tentry the entry of thread 24 * @param parameter the parameter of entry 25 * @param stack_addr the beginning stack address 26 * @param texit the function will be called when thread exit 27 * 28 * @return stack address 29 */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)30rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 31 rt_uint8_t *stack_addr, void *texit) 32 { 33 rt_uint32_t *stk; 34 35 stack_addr += sizeof(rt_uint32_t); 36 stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 37 stk = (rt_uint32_t *)stack_addr; 38 *(--stk) = (rt_uint32_t)_thread_start; /* entry point */ 39 *(--stk) = (rt_uint32_t)texit; /* lr */ 40 *(--stk) = 0xdeadbeef; /* r12 */ 41 *(--stk) = 0xdeadbeef; /* r11 */ 42 *(--stk) = 0xdeadbeef; /* r10 */ 43 *(--stk) = 0xdeadbeef; /* r9 */ 44 *(--stk) = 0xdeadbeef; /* r8 */ 45 *(--stk) = 0xdeadbeef; /* r7 */ 46 *(--stk) = 0xdeadbeef; /* r6 */ 47 *(--stk) = 0xdeadbeef; /* r5 */ 48 *(--stk) = 0xdeadbeef; /* r4 */ 49 *(--stk) = 0xdeadbeef; /* r3 */ 50 *(--stk) = 0xdeadbeef; /* r2 */ 51 *(--stk) = (rt_uint32_t)tentry; /* r1 : argument 2 for trampoline */ 52 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument 1 */ 53 /* cpsr */ 54 if ((rt_uint32_t)tentry & 0x01) 55 *(--stk) = SVCMODE | 0x20; /* thumb mode */ 56 else 57 *(--stk) = SVCMODE; /* arm mode */ 58 59 #ifdef RT_USING_SMART 60 *(--stk) = 0; /* user lr */ 61 *(--stk) = 0; /* user sp*/ 62 #endif 63 #ifdef RT_USING_FPU 64 *(--stk) = 0; /* not use fpu*/ 65 #endif 66 67 /* return task's current stack address */ 68 return (rt_uint8_t *)stk; 69 } 70 71 /*@}*/ 72