/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2011-09-23 Bernard the first version * 2011-10-05 Bernard add thumb mode * 2020-11-24 WangHuachen porting to zynqmp-r5 */ #include <rtthread.h> #include "armv7.h" /** * This function will initialize thread stack * * @param tentry the entry of thread * @param parameter the parameter of entry * @param stack_addr the beginning stack address * @param texit the function will be called when thread exit * * @return stack address */ rt_uint8_t *rt_hw_stack_init(void *tentry, void *parameter, rt_uint8_t *stack_addr, void *texit) { rt_uint32_t *stk; stack_addr += sizeof(rt_uint32_t); stack_addr = (rt_uint8_t *)RT_ALIGN_DOWN((rt_uint32_t)stack_addr, 8); stk = (rt_uint32_t *)stack_addr; *(--stk) = (rt_uint32_t)tentry; /* entry point */ *(--stk) = (rt_uint32_t)texit; /* lr */ *(--stk) = 0xdeadbeef; /* r12 */ *(--stk) = 0xdeadbeef; /* r11 */ *(--stk) = 0xdeadbeef; /* r10 */ *(--stk) = 0xdeadbeef; /* r9 */ *(--stk) = 0xdeadbeef; /* r8 */ *(--stk) = 0xdeadbeef; /* r7 */ *(--stk) = 0xdeadbeef; /* r6 */ *(--stk) = 0xdeadbeef; /* r5 */ *(--stk) = 0xdeadbeef; /* r4 */ *(--stk) = 0xdeadbeef; /* r3 */ *(--stk) = 0xdeadbeef; /* r2 */ *(--stk) = 0xdeadbeef; /* r1 */ *(--stk) = (rt_uint32_t)parameter; /* r0 : argument */ /* cpsr */ if ((rt_uint32_t)tentry & 0x01) *(--stk) = SVCMODE | 0x20; /* thumb mode */ else *(--stk) = SVCMODE; /* arm mode */ #if defined (__VFP_FP__) && !defined(__SOFTFP__) { int i; for (i = 0; i < VFP_DATA_NR; i++) { *(--stk) = 0; } /* FPSCR TODO: do we need to set the values other than 0? */ *(--stk) = 0; /* FPEXC. Enable the FVP if no lazy stacking. */ *(--stk) = 0x40000000; } #endif /* return task's current stack address */ return (rt_uint8_t *)stk; }