startup_stm32f10x_hd.s启动代码分析

******************** (C) COPYRIGHT 2010 STMicroelectronics ********************

;* File Name : startup_stm32f10x_hd.s

;* Author : MCD Application Team

;* Version : V3.4.0

;* Date : 10/15/2010

Stack_Size EQU 0x00000400 //定义1KB大小的栈空间

AREA STACK, NOINIT, READWRITE, ALIGN=3 //定义一个段,8(2的3次方)字节对齐 的空间作为栈

Stack_Mem SPACE Stack_Size //开辟栈大小1KB,并用0填充

__initial_sp //标记栈顶地址

Heap_Size EQU 0x00000200 //定义堆大小512字节

AREA HEAP, NOINIT, READWRITE, ALIGN=3 //定义堆空间,8字节对齐

__heap_base //堆空间基址

Heap_Mem SPACE Heap_Size //开辟堆空间512字节,并清0

__heap_limit //堆空间结束地址

PRESERVE8 //设置这个文件告诉编译器链接时堆栈是8字节对齐

THUMB //开始使用thumb指令模式

; Vector Table Mapped to Address 0 at Reset 复位后,中断向量表映射到地址0

AREA RESET, DATA, READONLY //定义名为RESET的只读段,这个名称最好不要乱改,不分大小写,

EXPORT __Vectors //声明全局符号,表示中断向量表入口地址

EXPORT __Vectors_End //中断向量表结束地址

EXPORT __Vectors_Size //大小

__Vectors DCD __initial_sp ; Top of Stack 栈顶地址

DCD Reset_Handler ; Reset Handler 复位中断的函数指针

DCD NMI_Handler ; NMI Handler

DCD HardFault_Handler ; Hard Fault Handler

DCD MemManage_Handler ; MPU Fault Handler

DCD BusFault_Handler ; Bus Fault Handler

DCD UsageFault_Handler ; Usage Fault Handler

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD 0 ; Reserved

DCD SVC_Handler ; SVCall Handler

DCD DebugMon_Handler ; Debug Monitor Handler

DCD 0 ; Reserved

DCD PendSV_Handler ; PendSV Handler

DCD SysTick_Handler ; SysTick Handler 以上都是内核中断

; External Interrupts 第16个开始是外设的中断

DCD WWDG_IRQHandler ; Window Watchdog

DCD PVD_IRQHandler ; PVD through EXTI Line detect

DCD TAMPER_IRQHandler ; Tamper

DCD RTC_IRQHandler ; RTC

DCD FLASH_IRQHandler ; Flash

DCD RCC_IRQHandler ; RCC

DCD EXTI0_IRQHandler ; EXTI Line 0

DCD EXTI1_IRQHandler ; EXTI Line 1

DCD EXTI2_IRQHandler ; EXTI Line 2

DCD EXTI3_IRQHandler ; EXTI Line 3

DCD EXTI4_IRQHandler ; EXTI Line 4

DCD DMA1_Channel1_IRQHandler ; DMA1 Channel 1

DCD DMA1_Channel2_IRQHandler ; DMA1 Channel 2

DCD DMA1_Channel3_IRQHandler ; DMA1 Channel 3

DCD DMA1_Channel4_IRQHandler ; DMA1 Channel 4

DCD DMA1_Channel5_IRQHandler ; DMA1 Channel 5

DCD DMA1_Channel6_IRQHandler ; DMA1 Channel 6

DCD DMA1_Channel7_IRQHandler ; DMA1 Channel 7

DCD ADC1_2_IRQHandler ; ADC1 & ADC2

DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX

DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0

DCD CAN1_RX1_IRQHandler ; CAN1 RX1

DCD CAN1_SCE_IRQHandler ; CAN1 SCE

DCD EXTI9_5_IRQHandler ; EXTI Line 9..5

DCD TIM1_BRK_IRQHandler ; TIM1 Break

DCD TIM1_UP_IRQHandler ; TIM1 Update

DCD TIM1_TRG_COM_IRQHandler ; TIM1 Trigger and Commutation

DCD TIM1_CC_IRQHandler ; TIM1 Capture Compare

DCD TIM2_IRQHandler ; TIM2

DCD TIM3_IRQHandler ; TIM3

DCD TIM4_IRQHandler ; TIM4

DCD I2C1_EV_IRQHandler ; I2C1 Event

DCD I2C1_ER_IRQHandler ; I2C1 Error

DCD I2C2_EV_IRQHandler ; I2C2 Event

DCD I2C2_ER_IRQHandler ; I2C2 Error

DCD SPI1_IRQHandler ; SPI1

DCD SPI2_IRQHandler ; SPI2

DCD USART1_IRQHandler ; USART1

DCD USART2_IRQHandler ; USART2

DCD USART3_IRQHandler ; USART3

DCD EXTI15_10_IRQHandler ; EXTI Line 15..10

DCD RTCAlarm_IRQHandler ; RTC Alarm through EXTI Line

DCD USBWakeUp_IRQHandler ; USB Wakeup from suspend

DCD TIM8_BRK_IRQHandler ; TIM8 Break

DCD TIM8_UP_IRQHandler ; TIM8 Update

DCD TIM8_TRG_COM_IRQHandler ; TIM8 Trigger and Commutation

DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare

DCD ADC3_IRQHandler ; ADC3

DCD FSMC_IRQHandler ; FSMC

DCD SDIO_IRQHandler ; SDIO

DCD TIM5_IRQHandler ; TIM5

DCD SPI3_IRQHandler ; SPI3

DCD UART4_IRQHandler ; UART4

DCD UART5_IRQHandler ; UART5

DCD TIM6_IRQHandler ; TIM6

DCD TIM7_IRQHandler ; TIM7

DCD DMA2_Channel1_IRQHandler ; DMA2 Channel1

DCD DMA2_Channel2_IRQHandler ; DMA2 Channel2

DCD DMA2_Channel3_IRQHandler ; DMA2 Channel3

DCD DMA2_Channel4_5_IRQHandler ; DMA2 Channel4 & Channel5

__Vectors_End ;以上即中断函数指针数组

__Vectors_Size EQU __Vectors_End - __Vectors ;计算中断向量表长度

AREA |.text|, CODE, READONLY ;定义只读代码段

; Reset handler ;复位中断服务的入口

Reset_Handler PROC ;PROC_ENDP是一个函数的开始与结束标记

EXPORT Reset_Handler [WEAK];声明复位中断向量为全局的,可供外部调用,WEAK标记本代码是备用编译

IMPORT __main ;导入c库中的main标号,这个是c库中的内容,不是我们自己写的那个main函数

IMPORT SystemInit ;导入SystemInit

LDR R0, =SystemInit

BLX R0 ;跳到SystemInit

LDR R0, =__main ;装载链接器添加的_mian代码,用来进行flash到ram的存储器映射与数据段拷贝并清0

BX R0 ;它还执行了lib_init等c库的初始化工作,完了之后再进入用户的mian函数

ENDP

; Dummy Exception Handlers (infinite loops which can be modified)

NMI_Handler PROC

EXPORT NMI_Handler [WEAK]

B . ;weak标记说明,如果使用这个备用的函数(外部文件中没有NMI_Handler),这里的B指令用nop替换,

ENDP ;也就是说让编译器忽略,外部找不到任何NMI_Handler函数时的警告或错误

HardFault_Handler\

PROC

EXPORT HardFault_Handler [WEAK]

B .

ENDP

MemManage_Handler\

PROC

EXPORT MemManage_Handler [WEAK]

B .

ENDP

BusFault_Handler\

PROC

EXPORT BusFault_Handler [WEAK]

B .

ENDP

UsageFault_Handler\

PROC

EXPORT UsageFault_Handler [WEAK]

B .

ENDP

SVC_Handler PROC

EXPORT SVC_Handler [WEAK]

B .

ENDP

DebugMon_Handler\

PROC

EXPORT DebugMon_Handler [WEAK]

B .

ENDP

PendSV_Handler PROC

EXPORT PendSV_Handler [WEAK]

B .

ENDP

SysTick_Handler PROC

EXPORT SysTick_Handler [WEAK]

B .

ENDP

Default_Handler PROC

EXPORT WWDG_IRQHandler [WEAK]

EXPORT PVD_IRQHandler [WEAK]

EXPORT TAMPER_IRQHandler [WEAK]

EXPORT RTC_IRQHandler [WEAK]

EXPORT FLASH_IRQHandler [WEAK]

EXPORT RCC_IRQHandler [WEAK]

EXPORT EXTI0_IRQHandler [WEAK]

EXPORT EXTI1_IRQHandler [WEAK]

EXPORT EXTI2_IRQHandler [WEAK]

EXPORT EXTI3_IRQHandler [WEAK]

EXPORT EXTI4_IRQHandler [WEAK]

EXPORT DMA1_Channel1_IRQHandler [WEAK]

EXPORT DMA1_Channel2_IRQHandler [WEAK]

EXPORT DMA1_Channel3_IRQHandler [WEAK]

EXPORT DMA1_Channel4_IRQHandler [WEAK]

EXPORT DMA1_Channel5_IRQHandler [WEAK]

EXPORT DMA1_Channel6_IRQHandler [WEAK]

EXPORT DMA1_Channel7_IRQHandler [WEAK]

EXPORT ADC1_2_IRQHandler [WEAK]

EXPORT USB_HP_CAN1_TX_IRQHandler [WEAK]

EXPORT USB_LP_CAN1_RX0_IRQHandler [WEAK]

EXPORT CAN1_RX1_IRQHandler [WEAK]

EXPORT CAN1_SCE_IRQHandler [WEAK]

EXPORT EXTI9_5_IRQHandler [WEAK]

EXPORT TIM1_BRK_IRQHandler [WEAK]

EXPORT TIM1_UP_IRQHandler [WEAK]

EXPORT TIM1_TRG_COM_IRQHandler [WEAK]

EXPORT TIM1_CC_IRQHandler [WEAK]

EXPORT TIM2_IRQHandler [WEAK]

EXPORT TIM3_IRQHandler [WEAK]

EXPORT TIM4_IRQHandler [WEAK]

EXPORT I2C1_EV_IRQHandler [WEAK]

EXPORT I2C1_ER_IRQHandler [WEAK]

EXPORT I2C2_EV_IRQHandler [WEAK]

EXPORT I2C2_ER_IRQHandler [WEAK]

EXPORT SPI1_IRQHandler [WEAK]

EXPORT SPI2_IRQHandler [WEAK]

EXPORT USART1_IRQHandler [WEAK]

EXPORT USART2_IRQHandler [WEAK]

EXPORT USART3_IRQHandler [WEAK]

EXPORT EXTI15_10_IRQHandler [WEAK]

EXPORT RTCAlarm_IRQHandler [WEAK]

EXPORT USBWakeUp_IRQHandler [WEAK]

EXPORT TIM8_BRK_IRQHandler [WEAK]

EXPORT TIM8_UP_IRQHandler [WEAK]

EXPORT TIM8_TRG_COM_IRQHandler [WEAK]

EXPORT TIM8_CC_IRQHandler [WEAK]

EXPORT ADC3_IRQHandler [WEAK]

EXPORT FSMC_IRQHandler [WEAK]

EXPORT SDIO_IRQHandler [WEAK]

EXPORT TIM5_IRQHandler [WEAK]

EXPORT SPI3_IRQHandler [WEAK]

EXPORT UART4_IRQHandler [WEAK]

EXPORT UART5_IRQHandler [WEAK]

EXPORT TIM6_IRQHandler [WEAK]

EXPORT TIM7_IRQHandler [WEAK]

EXPORT DMA2_Channel1_IRQHandler [WEAK]

EXPORT DMA2_Channel2_IRQHandler [WEAK]

EXPORT DMA2_Channel3_IRQHandler [WEAK]

EXPORT DMA2_Channel4_5_IRQHandler [WEAK]

WWDG_IRQHandler

PVD_IRQHandler

TAMPER_IRQHandler

RTC_IRQHandler

FLASH_IRQHandler

RCC_IRQHandler

EXTI0_IRQHandler

EXTI1_IRQHandler

EXTI2_IRQHandler

EXTI3_IRQHandler

EXTI4_IRQHandler

DMA1_Channel1_IRQHandler

DMA1_Channel2_IRQHandler

DMA1_Channel3_IRQHandler

DMA1_Channel4_IRQHandler

DMA1_Channel5_IRQHandler

DMA1_Channel6_IRQHandler

DMA1_Channel7_IRQHandler

ADC1_2_IRQHandler

USB_HP_CAN1_TX_IRQHandler

USB_LP_CAN1_RX0_IRQHandler

CAN1_RX1_IRQHandler

CAN1_SCE_IRQHandler

EXTI9_5_IRQHandler

TIM1_BRK_IRQHandler

TIM1_UP_IRQHandler

TIM1_TRG_COM_IRQHandler

TIM1_CC_IRQHandler

TIM2_IRQHandler

TIM3_IRQHandler

TIM4_IRQHandler

I2C1_EV_IRQHandler

I2C1_ER_IRQHandler

I2C2_EV_IRQHandler

I2C2_ER_IRQHandler

SPI1_IRQHandler

SPI2_IRQHandler

USART1_IRQHandler

USART2_IRQHandler

USART3_IRQHandler

EXTI15_10_IRQHandler

RTCAlarm_IRQHandler

USBWakeUp_IRQHandler

TIM8_BRK_IRQHandler

TIM8_UP_IRQHandler

TIM8_TRG_COM_IRQHandler

TIM8_CC_IRQHandler

ADC3_IRQHandler

FSMC_IRQHandler

SDIO_IRQHandler

TIM5_IRQHandler

SPI3_IRQHandler

UART4_IRQHandler

UART5_IRQHandler

TIM6_IRQHandler

TIM7_IRQHandler

DMA2_Channel1_IRQHandler

DMA2_Channel2_IRQHandler

DMA2_Channel3_IRQHandler

DMA2_Channel4_5_IRQHandler

B .

ENDP

ALIGN

;*******************************************************************************

; User Stack and Heap initialization

;*******************************************************************************

IF :DEF:__MICROLIB ;判断是否定义了这个宏

EXPORT __initial_sp ;是的话定义为全局属性

EXPORT __heap_base

EXPORT __heap_limit

ELSE

IMPORT __use_two_region_memory ;使用2个存储区?

EXPORT __user_initial_stackheap ;用户堆栈初始化入口

__user_initial_stackheap

LDR R0, = Heap_Mem ;堆栈初始化

LDR R1, =(Stack_Mem + Stack_Size)

LDR R2, = (Heap_Mem + Heap_Size)

LDR R3, = Stack_Mem

BX LR

ALIGN ;填充字节使地址对齐

ENDIF

END ;结束汇编文件

;******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE*****