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 * 2020-11-24 WangHuachen porting to zynqmp-r5 11 */ 12 #include <rtthread.h> 13 #include "armv7.h" 14 15 /** 16 * This function will initialize thread stack 17 * 18 * @param tentry the entry of thread 19 * @param parameter the parameter of entry 20 * @param stack_addr the beginning stack address 21 * @param texit the function will be called when thread exit 22 * 23 * @return stack address 24 */ rt_hw_stack_init(void * tentry,void * parameter,rt_uint8_t * stack_addr,void * texit)25rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, 26 rt_uint8_t *stack_addr, void *texit) 27 { 28 rt_uint32_t *stk; 29 30 stack_addr += sizeof(rt_uint32_t); 31 stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); 32 stk = (rt_uint32_t *)stack_addr; 33 *(--stk) = (rt_uint32_t)tentry; /* entry point */ 34 *(--stk) = (rt_uint32_t)texit; /* lr */ 35 *(--stk) = 0xdeadbeef; /* r12 */ 36 *(--stk) = 0xdeadbeef; /* r11 */ 37 *(--stk) = 0xdeadbeef; /* r10 */ 38 *(--stk) = 0xdeadbeef; /* r9 */ 39 *(--stk) = 0xdeadbeef; /* r8 */ 40 *(--stk) = 0xdeadbeef; /* r7 */ 41 *(--stk) = 0xdeadbeef; /* r6 */ 42 *(--stk) = 0xdeadbeef; /* r5 */ 43 *(--stk) = 0xdeadbeef; /* r4 */ 44 *(--stk) = 0xdeadbeef; /* r3 */ 45 *(--stk) = 0xdeadbeef; /* r2 */ 46 *(--stk) = 0xdeadbeef; /* r1 */ 47 *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ 48 49 /* cpsr */ 50 if ((rt_uint32_t)tentry & 0x01) 51 *(--stk) = SVCMODE | 0x20; /* thumb mode */ 52 else 53 *(--stk) = SVCMODE; /* arm mode */ 54 55 #if defined (__VFP_FP__) && !defined(__SOFTFP__) 56 { 57 int i; 58 for (i = 0; i < VFP_DATA_NR; i++) 59 { 60 *(--stk) = 0; 61 } 62 /* FPSCR TODO: do we need to set the values other than 0? */ 63 *(--stk) = 0; 64 /* FPEXC. Enable the FVP if no lazy stacking. */ 65 *(--stk) = 0x40000000; 66 } 67 #endif 68 69 /* return task's current stack address */ 70 return (rt_uint8_t *)stk; 71 } 72 73