STM32F10x 启动代码分析

;******************** (C) COPYRIGHT 2010 STMicroelectronics ********************
;* File Name          : startup_stm32f10x_hd_vl.s
;* Author             : MCD Application Team
;* Version            : V3.4.0
;* Date               : 10/15/2010
;* Description        : STM32F10x High Density Value Line 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 STM32100E-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 >>>  
;*******************************************************************************
; THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
; WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
; AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
; INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
; CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
; INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
;*******************************************************************************

; Amount of memory (in bytes) allocated for Stack
; Tailor this value to your application needs
;

Stack_Size      EQU     0x00000400     ；栈大小

                AREA    STACK, NOINIT, READWRITE, ALIGN=3

                                       ；用AREA 标记 STACK段的开始，未初始化，可读写，8字节对齐
Stack_Mem       SPACE   Stack_Size     ；为Stack_Mem 分配Stack_Size个字大小的连续空间，初始化为0
__initial_sp                           ；STACK 地址分配结束标记（结束地址）

;

Heap_Size       EQU     0x00000200     ；堆大小

                AREA    HEAP, NOINIT, READWRITE, ALIGN=3

                                       ；用AREA 标记 HEAP段的开始，未初始化，可读写，8字节对齐
__heap_base                            ；堆的基地址标识（开始地址），（汇编过程中实际分配具体地址）
Heap_Mem        SPACE   Heap_Size      ；为Heap_Mem 分配Heap_Size个字大小的连续空间，初始化为0
__heap_limit                           ；堆的末地址标记（结束地址）

                PRESERVE8              ；要求堆栈保持8字节对齐
                THUMB                  ；说明下面的代码是Thumb 汇编

; Vector Table Mapped to Address 0 at Reset          ；
                AREA    RESET, DATA, READONLY  ；标记 RESET 段的开始，数据段，只读
                EXPORT  __Vectors      ；声明一个全局可引用的标号“__Vectors”
                EXPORT  __Vectors_End  ；声明一个全局可引用的标号“__Vectors_End”
                EXPORT  __Vectors_Size ；声明一个全局可引用的标号“__Vectors_Size”

__Vectors       DCD     __initial_sp   ；Top of Stack

                                       ；该处物理地址值即为 __Vetors 标号所表示的值，
                                       ；该地址中存储__initial_sp所表示的地址值，

                                       ；大小为一个字（32bit）
                DCD     Reset_Handler  ；Reset Handler  ；这个地址填充 Reset_Handler 入口地址
                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   ；保留一个字大小的空间（32bit）
                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

                ; External Interrupts
                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_IRQHandler              ; ADC1
                DCD     0                            ; Reserved
                DCD     0                            ; Reserved
                DCD     0                            ; Reserved
                DCD     0                            ; Reserved
                DCD     EXTI9_5_IRQHandler           ; EXTI Line 9..5
                DCD     TIM1_BRK_TIM15_IRQHandler    ; TIM1 Break and TIM15
                DCD     TIM1_UP_TIM16_IRQHandler     ; TIM1 Update and TIM16
                DCD     TIM1_TRG_COM_TIM17_IRQHandler; TIM1 Trigger and Commutation and TIM17
                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     CEC_IRQHandler               ; HDMI-CEC
                DCD     TIM12_IRQHandler             ; TIM12
                DCD     TIM13_IRQHandler             ; TIM13
                DCD     TIM14_IRQHandler             ; TIM14
                DCD     0                            ; Reserved
                DCD     0                            ; Reserved
                DCD     FSMC_IRQHandler              ; FSMC
                DCD     0                            ; Reserved
                DCD     TIM5_IRQHandler              ; TIM5
                DCD     SPI3_IRQHandler              ; SPI3
                DCD     UART4_IRQHandler             ; UART4
                DCD     UART5_IRQHandler             ; UART5
                DCD     TIM6_DAC_IRQHandler          ; TIM6 and DAC underrun
                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
                DCD     DMA2_Channel5_IRQHandler     ; DMA2 Channel5               
__Vectors_End                                        ；__Vectors_End 标号

__Vectors_Size  EQU  __Vectors_End - __Vectors       ；__Vectors_Size 大小

                AREA    |.text|, CODE, READONLY      ；标记代码段开始，只读，两个“|”必须要加上
                                                     ；因为“text”前面有个“。”，

                                                     ；AREA 后面第一个参数为段名
                                                     ；若以数值或标点开始就要用“|”夹起来

; Reset handler
Reset_Handler    PROC                                ；定义硬重启中断子程序段，
                 EXPORT  Reset_Handler    [WEAK]     ；声明一个全局可引用的标号“Reset_Handler”
                                                ；[WEAK]选项声明其他的同名标号优先于该标号被引用。
     IMPORT  __main                                  ；引用 __main标号，即main函数入口
     IMPORT  SystemInit                              ；引用 SystemInit 标号
                 LDR     R0, =SystemInit
                 BLX     R0                          ；跳转至 SystemInit，执行完后返回
                 LDR     R0, =__main
                 BX      R0                          ；跳转至 main函数，不返回
                 ENDP                                ；子程序结束

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

NMI_Handler     PROC                                 ；定义NMI_Handler子程序段
                EXPORT  NMI_Handler       [WEAK]     ；声明一个全局可引用的标号“NMI_Handler”
                B       .                            ；. 表示当前地址。B  . 跳转至当前地址
                ENDP                                 ；子程序结束
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_IRQHandler                  [WEAK]
                EXPORT  EXTI9_5_IRQHandler               [WEAK]
                EXPORT  TIM1_BRK_TIM15_IRQHandler        [WEAK]
                EXPORT  TIM1_UP_TIM16_IRQHandler         [WEAK]
                EXPORT  TIM1_TRG_COM_TIM17_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  CEC_IRQHandler                   [WEAK]
                EXPORT  TIM12_IRQHandler                 [WEAK]
                EXPORT  TIM13_IRQHandler                 [WEAK]
                EXPORT  TIM14_IRQHandler                 [WEAK]
                EXPORT  FSMC_IRQHandler                  [WEAK]
                EXPORT  TIM5_IRQHandler                  [WEAK]
                EXPORT  SPI3_IRQHandler                  [WEAK]
                EXPORT  UART4_IRQHandler                 [WEAK]
                EXPORT  UART5_IRQHandler                 [WEAK]               
                EXPORT  TIM6_DAC_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]
                EXPORT  DMA2_Channel5_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_IRQHandler
EXTI9_5_IRQHandler
TIM1_BRK_TIM15_IRQHandler
TIM1_UP_TIM16_IRQHandler
TIM1_TRG_COM_TIM17_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
CEC_IRQHandler
TIM12_IRQHandler
TIM13_IRQHandler
TIM14_IRQHandler
FSMC_IRQHandler
TIM5_IRQHandler
SPI3_IRQHandler
UART4_IRQHandler
UART5_IRQHandler
TIM6_DAC_IRQHandler
TIM7_IRQHandler
DMA2_Channel1_IRQHandler
DMA2_Channel2_IRQHandler
DMA2_Channel3_IRQHandler
DMA2_Channel4_5_IRQHandler
DMA2_Channel5_IRQHandler
                B       .

                ENDP

                ALIGN                               ；对齐方式采用默认的对齐

;*******************************************************************************
; User Stack and Heap initialization
;*******************************************************************************
                 IF      :DEF:__MICROLIB            ；条件成立
               
                 EXPORT  __initial_sp               ；声明一个全局可引用的标号“__initial_sp”
                 EXPORT  __heap_base                ；声明一个全局可引用的标号“__heap_base”
                 EXPORT  __heap_limit               ；声明一个全局可引用的标号“__heap_limit”
               
                 ELSE                               ；条件不成立
               
                 IMPORT  __use_two_region_memory    ；引用 __use_two_region_memory 标号
                 EXPORT  __user_initial_stackheap 

                                             ；声明一个全局可引用的标号“__user_initial_stakheap”
__user_initial_stackheap

                 LDR     R0, =  Heap_Mem
                 LDR     R1, =(Stack_Mem + Stack_Size)
                 LDR     R2, = (Heap_Mem +  Heap_Size)
                 LDR     R3, = Stack_Mem
                 BX      LR                          ；函数返回

                 ALIGN                               ；对齐方式采用默认的对齐

                 ENDIF                               ；条件结束

                 END                              ；汇编文件结束,编译器认为END后面是没有汇编代码了

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