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/*
* 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
*/
#include <rtthread.h>
#include <cpuport.h>
#include <board.h>
/**
* @addtogroup ARM Cortex-A
*/
/*@{*/
/**
* 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)_thread_start; /* 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) = (rt_uint32_t)tentry; /* r1 : argument 2 for trampoline */
*(--stk) = (rt_uint32_t)parameter; /* r0 : argument 1 */
/* cpsr */
if ((rt_uint32_t)tentry & 0x01)
*(--stk) = SVCMODE | 0x20; /* thumb mode */
else
*(--stk) = SVCMODE; /* arm mode */
#ifdef RT_USING_SMART
*(--stk) = 0; /* user lr */
*(--stk) = 0; /* user sp*/
#endif
#ifdef RT_USING_FPU
/* FPU context initialization matches context_gcc.S restore order:
* Stack layout (high to low): FPEXC -> FPSCR -> D16-D31 -> D0-D15
*/
stk -= VFP_DATA_NR;
rt_memset(stk, 0, VFP_DATA_NR * sizeof(rt_uint32_t)); /* Initialize D0-D31 (64 words for 32 double regs) */
*(--stk) = 0; /* FPSCR: Floating-Point Status and Control Register */
*(--stk) = 0x40000000; /* FPEXC: Enable FPU (bit 30 = EN) */
#endif
/* return task's current stack address */
return (rt_uint8_t *)stk;
}
/*@}*/
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