1 /* 2 * Copyright (c) 2006-2018, RT-Thread Development Team 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 * 6 * Change Logs: 7 * Date Author Notes 8 * 2008-12-11 XuXinming first version 9 * 2013-05-24 Grissiom port to RM48x50 10 */ 11 #include <rtthread.h> 12 13 #include "armv7.h" 14 /** 15 * @addtogroup RM48x50 16 */ 17 /*@{*/ 18 19 /** 20 * This function will initialize thread stack 21 * 22 * @param tentry the entry of thread 23 * @param parameter the parameter of entry 24 * @param stack_addr the beginning stack address 25 * @param texit the function will be called when thread exit 26 * 27 * @return stack address 28 */ 29 rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 30 rt_uint8_t *stack_addr, void *texit) 31 { 32 rt_uint32_t *stk; 33 34 stack_addr += sizeof(rt_uint32_t); 35 stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 36 stk = (rt_uint32_t *)stack_addr; 37 *(--stk) = (rt_uint32_t)tentry; /* entry point */ 38 *(--stk) = (rt_uint32_t)texit; /* lr */ 39 *(--stk) = 0xdeadbeef; /* r12 */ 40 *(--stk) = 0xdeadbeef; /* r11 */ 41 *(--stk) = 0xdeadbeef; /* r10 */ 42 *(--stk) = 0xdeadbeef; /* r9 */ 43 *(--stk) = 0xdeadbeef; /* r8 */ 44 *(--stk) = 0xdeadbeef; /* r7 */ 45 *(--stk) = 0xdeadbeef; /* r6 */ 46 *(--stk) = 0xdeadbeef; /* r5 */ 47 *(--stk) = 0xdeadbeef; /* r4 */ 48 *(--stk) = 0xdeadbeef; /* r3 */ 49 *(--stk) = 0xdeadbeef; /* r2 */ 50 *(--stk) = 0xdeadbeef; /* r1 */ 51 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 52 53 /* cpsr */ 54 if ((rt_uint32_t)tentry & 0x01) 55 *(--stk) = SVCMODE | 0x20; /* thumb mode */ 56 else 57 *(--stk) = SVCMODE; /* arm mode */ 58 59 #if defined(__TI_VFP_SUPPORT__) || (defined (__VFP_FP__) && !defined(__SOFTFP__)) 60 #ifndef RT_VFP_LAZY_STACKING 61 { 62 int i; 63 64 for (i = 0; i < VFP_DATA_NR; i++) 65 { 66 *(--stk) = 0; 67 } 68 /* FPSCR TODO: do we need to set the values other than 0? */ 69 *(--stk) = 0; 70 /* FPEXC. Enable the FVP if no lazy stacking. */ 71 *(--stk) = 0x40000000; 72 } 73 #else 74 /* FPEXC. Disable the FVP by default. */ 75 *(--stk) = 0x00000000; 76 #endif 77 #endif 78 79 /* return task's current stack address */ 80 return (rt_uint8_t *)stk; 81 } 82 83 /*@}*/ 84