原创 STM32启动文件分析注释 V3.4

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

;* File Name          : startup_stm32f10x_hd.s

;* Author             : MCD Application Team

;* Version            : V3.4.0

;* Date               : 10/15/2010

;* Description        : STM32F10x High Density Devices vector table for MDK-ARM

;*                      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 and also configure the external

;*                        SRAM mounted on STM3210E-EVAL board to be used as data

;*                        memory (optional, to be enabled by user)

;*                      - Branches to __main in the C library (which eventually

;*                        calls main()).

;*                      After Reset the CortexM3 processor is in Thread mode,

;*                      priority is Privileged, and the Stack is set to Main.

;* <<< Use Configuration Wizard in Context Menu >>>

;                        INITIALIZE EXCEPTION VECTORS

; 首先对栈和堆的大小进行定义，并在代码区的起始处建立中断向量表，其第一个表项是栈

; 顶地址，第二个表项是复位中断服务入口地址。然后在复位中断服务程序中跳转??C/C++标

; 准实时库的__main函数。假设STM32被设置为从内部FLASH启动中断向量表起始地位为0x8000000，

; 则栈顶地址存放于0x8000000处，而复位中断服务入口地址存放于0x8000004处。当STM32遇

; 到复位信号后，则从0x80000004处取出复位中断服务入口地址继而执行复位中断服务程序，

; 然后跳转__main函数，最后来到C的世界。

 

; DCD指令：作用是开辟一段空间，其意义等价于C语言中的地址符“&”。开始建立的中断向量

; 表则类似于使用C语.其每一个成员都是一个函数指针，分别指向各个中断服务函数

 

;伪指令AREA，表示开辟一段大小为Stack_Size的内存空间作为栈，段名是STACK，可读可写。

;NOINIT：指定此数据段仅仅保留了内存单元，而没有将各初始值写入内存单元，或者将各个内存单元值初始化为0

; Amount of memory (in bytes) allocated for Stack

; Tailor this value to your application needs

; <h> Stack Configuration

;   <o> Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>

; </h>

 

Stack_Size      EQU    0x0000200

 

               AREA    STACK, NOINIT, READWRITE, ALIGN=3       ;解释在上面有说明    

Stack_Mem       SPACE   Stack_Size                             ;分配连续 Stack_Size 字节的存储单元并初始化为 0。

__initial_sp                                                   ;标号__initial_sp，表示栈空间顶地址。

                                                 

; <h> Heap Configuration

;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>

; </h>

 

Heap_Size       EQU     0x0000200

 

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3       ;ALIGN用来指定对齐方式， 8字节对齐

__heap_base                                                    ;表示堆空间起始地址

Heap_Mem        SPACE   Heap_Size

__heap_limit                                                   ;表示堆空间结束地址

 

                PRESERVE8                                       ;PRESERVE8 指令指定当前文件保持堆栈八字节对齐

                THUMB                                           ;THUMB指令

                                                                              

 

; Vector Table Mapped to Address 0 at Reset                        ;实际上是在CODE区（假设STM32从FLASH启动，则此中断向量表起始地址即为0x8000000）

                AREA    RESET, DATA, READONLY                     ;定义一块数据段，只可读，段名字是RESET

                EXPORT  __Vectors                                  ;EXPORT：在程序中声明一个全局的标号__Vectors，该标号可在其他的文件中引用

                EXPORT  __Vectors_End                             ;在程序中声明一个全局的标号__Vectors_End

                EXPORT  __Vectors_Size                            ;在程序中声明一个全局的标号__Vectors_Size

__Vectors                                                         ;建立中断向量表

DCD     __initial_sp                                    ; 0,Top of Stack

DCD     Reset_Handler                                   ; 1,Reset Handler

DCD     NMI_Handler                                     ; 2,NMI Handler

DCD     HardFault_Handler                               ; 3,Hard Fault Handler

DCD     MemManage_Handler                               ; 4,MPU Fault Handler

DCD     BusFault_Handler                                ; 5,Bus Fault Handler

DCD     UsageFault_Handler                              ; 6,Usage Fault Handler

DCD     0                                               ; 7,Reserved

DCD     0                                               ; 8,Reserved

DCD     0                                               ; 9,Reserved

DCD     0                                               ; 10,Reserved

DCD     SVC_Handler                                     ; 11,SVCall Handler

DCD     DebugMon_Handler                                ; 12,Debug Monitor Handler

DCD     0                                               ; 13,Reserved

;IMPORT  OSPendSV

;DCD     OSPendSV                                       ; for u/COS-II 以前是 PendSV Handler

;IMPORT  Tmr_TickISR_Handler

;DCD     Tmr_TickISR_Handler                            ; for u/COS-II 以前是 SysTick Handler

;IMPORT   OS_CPU_PendSVHandler

DCD      OS_CPU_PendSVHandler                            ;14,PendSV Handler

 

;IMPORT     OS_CPU_SysTickHandler

DCD    OS_CPU_SysTickHandler                            ;15,uC/OS-II Tick ISR Handler

 

; External Interrupts

DCD     WWDG_IRQHandler                              ; 16, INTISR[  0]  Window Watchdog.

DCD     PVD_IRQHandler                               ; 17, INTISR[  1]  PVD through EXTI Line Detection.

DCD     TAMPER_IRQHandler                            ; 18, INTISR[  2]  Tamper Interrupt.

DCD     RTC_IRQHandler                               ; 19, INTISR[  3]  RTC Global Interrupt.

DCD     FLASH_IRQHandler                             ; 20, INTISR[  4]  FLASH Global Interrupt.

DCD     RCC_IRQHandler                               ; 21, INTISR[  5]  RCC Global Interrupt.

DCD     EXTI0_IRQHandler                             ; 22, INTISR[  6]  EXTI Line0 Interrupt.

DCD     EXTI1_IRQHandler                             ; 23, INTISR[  7]  EXTI Line1 Interrupt.

DCD     EXTI2_IRQHandler                             ; 24, INTISR[  8]  EXTI Line2 Interrupt.

DCD     EXTI3_IRQHandler                            ; 25, INTISR[  9]  EXTI Line3 Interrupt.

DCD     EXTI4_IRQHandler                             ; 26, INTISR[ 10]  EXTI Line4 Interrupt.

DCD     DMA1_Channel1_IRQHandler                    ; 27, INTISR[ 11]  DMA Channel1 Global Interrupt.

DCD     DMA1_Channel2_IRQHandler                    ; 28, INTISR[ 12]  DMA Channel2 Global Interrupt.

DCD     DMA1_Channel3_IRQHandler                    ; 29, INTISR[ 13]  DMA Channel3 Global Interrupt.

DCD     DMA1_Channel4_IRQHandler                    ; 30, INTISR[ 14]  DMA Channel4 Global Interrupt.

DCD     DMA1_Channel5_IRQHandler                    ; 31, INTISR[ 15]  DMA Channel5 Global Interrupt.

DCD     DMA1_Channel6_IRQHandler                    ; 32, INTISR[ 16]  DMA Channel6 Global Interrupt.

DCD     DMA1_Channel7_IRQHandler                    ; 33, INTISR[ 17]  DMA Channel7 Global Interrupt.

DCD     ADC1_2_IRQHandler                           ; 34, INTISR[ 18]  ADC1 & ADC2 Global Interrupt.

DCD     USB_HP_CAN1_TX_IRQHandler                   ; 35, INTISR[ 19]  USB High Prio / CAN TX  Interrupts.

DCD     USB_LP_CAN1_RX0_IRQHandler                  ; 36, INTISR[ 20]  USB Low  Prio / CAN RX0 Interrupts.

DCD     CAN1_RX1_IRQHandler                          ; 37, INTISR[ 21]  CAN RX1 Interrupt.

DCD     CAN1_SCE_IRQHandler                          ; 38, INTISR[ 22]  CAN SCE Interrupt.

DCD     EXTI9_5_IRQHandler                           ; 39, INTISR[ 23]  EXTI Line[9:5] Interrupt.

DCD     TIM1_BRK_IRQHandler                          ; 40, INTISR[ 24]  TIM1 Break  Interrupt.

DCD     TIM1_UP_IRQHandler                          ; 41, INTISR[ 25]  TIM1 Update Interrupt.

DCD     TIM1_TRG_COM_IRQHandler                     ; 42, INTISR[ 26]  TIM1 Trig & Commutation Interrupts.

DCD     TIM1_CC_IRQHandler                           ; 43, INTISR[ 27]  TIM1 Capture Compare Interrupt.

DCD     TIM2_IRQHandler                              ; 44, INTISR[ 28]  TIM2 Global Interrupt.

DCD     TIM3_IRQHandler                              ; 45, INTISR[ 29]  TIM3 Global Interrupt.

DCD     TIM4_IRQHandler                              ; 46, INTISR[ 30]  TIM4 Global Interrupt.

DCD     I2C1_EV_IRQHandler                           ; 47, INTISR[ 31]  I2C1 Event  Interrupt.

 

DCD     I2C1_ER_IRQHandler                           ; 48, INTISR[ 32]  I2C1 Error  Interrupt.

DCD     I2C2_EV_IRQHandler                           ; 49, INTISR[ 33]  I2C2 Event  Interrupt.

DCD     I2C2_ER_IRQHandler                           ; 50, INTISR[ 34]  I2C2 Error  Interrupt.

DCD     SPI1_IRQHandler                              ; 51, INTISR[ 35]  SPI1 Global Interrupt.

DCD     SPI2_IRQHandler                              ; 52, INTISR[ 36]  SPI2 Global Interrupt.

DCD     USART1_IRQHandler                            ; 53, INTISR[ 37]  USART1 Global Interrupt.

DCD     USART2_IRQHandler                            ; 54, INTISR[ 38]  USART2 Global Interrupt.

DCD     USART3_IRQHandler                            ; 55, INTISR[ 39]  USART3 Global Interrupt.

DCD     EXTI15_10_IRQHandler                         ; 56, INTISR[ 40]  EXTI Line [15:10] Interrupts.

DCD     RTCAlarm_IRQHandler                          ; 57, INTISR[ 41]  RTC Alarm EXT Line Interrupt.

DCD     USBWakeUp_IRQHandler                         ; 58, INTISR[ 42]  USB Wakeup from Suspend EXTI Int.

DCD     TIM8_BRK_IRQHandler                          ; 59, INTISR[ 43]  TIM8 Break Interrupt.

DCD     TIM8_UP_IRQHandler                          ; 60, INTISR[ 44]  TIM8 Update Interrupt.

DCD     TIM8_TRG_COM_IRQHandler                      ; 61, INTISR[ 45]  TIM8 Trigg/Commutation Interrupts.

DCD     TIM8_CC_IRQHandler                           ; 62, INTISR[ 46]  TIM8 Capture Compare Interrupt.

DCD     ADC3_IRQHandler                              ; 63, INTISR[ 47]  ADC3 Global Interrupt.

 

DCD     FSMC_IRQHandler                              ; 64, INTISR[ 48]  FSMC Global Interrupt.

DCD     SDIO_IRQHandler                              ; 65, INTISR[ 49]  SDIO Global Interrupt.

DCD     TIM5_IRQHandler                              ; 66, INTISR[ 50]  TIM5 Global Interrupt.

DCD     SPI3_IRQHandler                              ; 67, INTISR[ 51]  SPI3 Global Interrupt.

DCD     UART4_IRQHandler                             ; 68, INTISR[ 52]  UART4 Global Interrupt.

DCD     UART5_IRQHandler                             ; 69, INTISR[ 53]  UART5 Global Interrupt.

DCD     TIM6_IRQHandler                             ; 70, INTISR[ 54]  TIM6 Global Interrupt.

DCD     TIM7_IRQHandler                             ; 71, INTISR[ 55]  TIM7 Global Interrupt.

DCD     DMA2_Channel1_IRQHandler                    ; 72, INTISR[ 56]  DMA2 Channel1 Global Interrupt.

DCD     DMA2_Channel2_IRQHandler                    ; 73, INTISR[ 57]  DMA2 Channel2 Global Interrupt.

DCD     DMA2_Channel3_IRQHandler                    ; 74, INTISR[ 58]  DMA2 Channel3 Global Interrupt.

DCD     DMA2_Channel4_5_IRQHandler                  ; 75, INTISR[ 59]  DMA2 Channel4/5 Global Interrups.

__Vectors_End

 

__Vectors_Size  EQU  __Vectors_End - __Vectors     ;得到向量表的大小,304个字节也就是0x130个字节

 

                AREA    |.text|, CODE, READONLY    ;定义一个代码段，可读，段名字是.text

               

; Reset handler

Reset_Handler   PROC                               ;利用PROC、ENDP这一对伪指令把程序段分为若干个过程，使程序的结构加清晰

                EXPORT  Reset_Handler             [WEAK]  ;在外部没有定义该符号时导出该符号Reset_Handler 

                IMPORT  __main                   ;IMPORT：伪指令用于通知编译器要使用的标号在其他的源文件中定义

                IMPORT  SystemInit               ;但要在当前源文件中引用，而且无论当前源文件是否引用该标号，该标号均会被加入到当前源文件的符号表中

                LDR     R0, =SystemInit

                BLX     R0              

                LDR     R0, =__main              ;__main为 运行时库提供的函数；完成堆栈，堆的初始话等工作，会调用下面定义的__user_initial_stackheap

                BX      R0                       ;跳到__main，进入C的世界  

                ENDP

               

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

 

NMI_Handler     PROC

                EXPORT  NMI_Handler                [WEAK] ;WEAK声明其他的同名标号优先于该标号被引用,就是说如果外面声明了的话，

                B       .                              ;会调用外面的

                ENDP

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

OS_CPU_PendSVHandler   PROC           

                EXPORT  OS_CPU_PendSVHandler       [WEAK]

                B       .         

               ENDP

OS_CPU_SysTickHandler   PROC              

                EXPORT  OS_CPU_SysTickHandler      [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            ;判断是否使用DEF:__MICROLIB（micro lib）

               

                 EXPORT  __initial_sp               ;使用的话则将栈顶地址，堆始末地址赋予全局属

                 EXPORT  __heap_base                ;性，使外部程序可以使用

                 EXPORT  __heap_limit

               

                 ELSE                               ;如果使用默认C库运行时

               

                 IMPORT  __use_two_region_memory    ;定义全局标号__use_two_region_memory

                 EXPORT  __user_initial_stackheap       ;声明全局标号__user_initial_stackheap，这样外程序也可调用此标号

                                                 ;则进行堆栈和堆的赋值，在__main函数执行过程中调用

__user_initial_stackheap                         ;标号__user_initial_stackheap，表示用户堆栈初始化程序入口

 

                 LDR     R0, =  Heap_Mem            ;保存堆始地址

                 LDR     R1, =(Stack_Mem + Stack_Size) ;保存栈的大小

                 LDR     R2, = (Heap_Mem +  Heap_Size) ;保存堆的大小

                 LDR     R3, = Stack_Mem            ;保存栈顶指针

                 BX      LR

 

                 ALIGN

 

                 ENDIF

 

                 END

 

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