forked from xuos/xiuos
115 lines
3.2 KiB
ArmAsm
115 lines
3.2 KiB
ArmAsm
/**
|
|
*************** (C) COPYRIGHT 2017 STMicroelectronics ************************
|
|
* @file startup_stm32f103xb.s
|
|
* @author MCD Application Team
|
|
* @brief STM32F103xB Devices vector table for Atollic toolchain.
|
|
* This module performs:
|
|
* - Set the initial SP
|
|
* - Set the initial PC == Reset_Handler,
|
|
* - Set the vector table entries with the exceptions ISR address
|
|
* - Configure the clock system
|
|
* - Branches to main in the C library (which eventually
|
|
* calls main()).
|
|
* After Reset the Cortex-M3 processor is in Thread mode,
|
|
* priority is Privileged, and the Stack is set to Main.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* <h2><center>© Copyright (c) 2017 STMicroelectronics.
|
|
* All rights reserved.</center></h2>
|
|
*
|
|
* This software component is licensed by ST under BSD 3-Clause license,
|
|
* the "License"; You may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at:
|
|
* opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
|
|
/**
|
|
* @file boot.S
|
|
* @brief derived from ST standard peripheral library
|
|
* @version 1.1
|
|
* @author AIIT XUOS Lab
|
|
* @date 2021-11-30
|
|
*/
|
|
|
|
/*************************************************
|
|
File name: boot.S
|
|
Description: Reset and init function
|
|
Others:
|
|
History:
|
|
1. Date: 2021-11-30
|
|
Author: AIIT XUOS Lab
|
|
Modification:
|
|
1. take startup_stm32f103xb.s for XiZi kernel
|
|
*************************************************/
|
|
|
|
.syntax unified
|
|
.cpu cortex-m3
|
|
.fpu softvfp
|
|
.thumb
|
|
|
|
/* start address for the initialization values of the .data section.
|
|
defined in linker script */
|
|
.word _sidata
|
|
/* start address for the .data section. defined in linker script */
|
|
.word _sdata
|
|
/* end address for the .data section. defined in linker script */
|
|
.word _edata
|
|
/* start address for the .bss section. defined in linker script */
|
|
.word _sbss
|
|
/* end address for the .bss section. defined in linker script */
|
|
.word _ebss
|
|
|
|
.equ BootRAM, 0xF108F85F
|
|
/**
|
|
* @brief This is the code that gets called when the processor first
|
|
* starts execution following a reset event. Only the absolutely
|
|
* necessary set is performed, after which the application
|
|
* supplied main() routine is called.
|
|
* @param None
|
|
* @retval : None
|
|
*/
|
|
|
|
.section .text.Reset_Handler
|
|
.weak Reset_Handler
|
|
.type Reset_Handler, %function
|
|
Reset_Handler:
|
|
|
|
/* Copy the data segment initializers from flash to SRAM */
|
|
movs r1, #0
|
|
b LoopCopyDataInit
|
|
|
|
CopyDataInit:
|
|
ldr r3, =_sidata
|
|
ldr r3, [r3, r1]
|
|
str r3, [r0, r1]
|
|
adds r1, r1, #4
|
|
|
|
LoopCopyDataInit:
|
|
ldr r0, =_sdata
|
|
ldr r3, =_edata
|
|
adds r2, r0, r1
|
|
cmp r2, r3
|
|
bcc CopyDataInit
|
|
ldr r2, =_sbss
|
|
b LoopFillZerobss
|
|
/* Zero fill the bss segment. */
|
|
FillZerobss:
|
|
movs r3, #0
|
|
str r3, [r2], #4
|
|
|
|
LoopFillZerobss:
|
|
ldr r3, = _ebss
|
|
cmp r2, r3
|
|
bcc FillZerobss
|
|
|
|
/* Call the clock system intitialization function.*/
|
|
bl SystemInit
|
|
|
|
/* Call the application's entry point.*/
|
|
bl entry
|
|
bx lr
|
|
.size Reset_Handler, .-Reset_Handler
|