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STM32 keil mdk启动代码发分析

STM32 keil mdk启动代码发分析

;//  Stack Configuration   
;//    Stack Size (in Bytes) <0x0-0xFFFFFFFF:8>   
;// 
   
Stack_Size      EQU     0x00000200                           ;//定义堆栈大小   
                AREA    STACK, NOINIT, READWRITE, ALIGN=3    ;//定义一个数据段 按8字节对齐    
;AREA 伪指令用于定义一个代码段或数据段 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
Stack_Mem       SPACE   Stack_Size                           ;//保留Stack_Size大小的堆栈空间 分 配连续 Stack_Size 字节的存储单元并初始化为 0
__initial_sp                                                 ;//标号,代表堆栈顶部地址,后面有用   
;//  Heap Configuration   
;//    Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>   
;// 
   
Heap_Size       EQU     0x00000020                            ;//定义堆空间大小   
                AREA    HEAP, NOINIT, READWRITE, ALIGN=3      ;//定义一个数据段,8字节对齐   
__heap_base   
Heap_Mem        SPACE   Heap_Size                             ;//保留Heap_Size的堆空间   
__heap_limit                                                  ;//标号,代表堆末尾地址,后面有用   
                PRESERVE8                                     ;//指示编译器8字节对齐   
                THUMB                                         ;//指示编译器为THUMB指令   
; Vector Table Mapped to Address 0 at Reset   
                AREA    RESET, DATA, READONLY                  ;//定义只读数据段,其实放在CODE区,位于0地址   
                   
                EXTERN NMIException   
                EXTERN HardFaultException   
                EXTERN MemManageException   
                EXTERN BusFaultException   
                EXTERN UsageFaultException   
                EXTERN SVCHandler   
                EXTERN DebugMonitor   
                EXTERN PendSVC   
                EXTERN SysTickHandler               ;//声明这些符号在外部定义,同C   
                                                                            ;//在××it.c中实现这些函数 ,中断就能自动调用了   
                EXPORT __Vectors       
                EXPORT __initial_sp                     
;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;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, ;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
__Vectors       DCD     __initial_sp              ; Top of Stack         //Cotex-M 要求此处为堆栈顶部地址   
                DCD     Reset_Handler                ; Reset Handler   
                DCD     NMIException                   ; NMI Handler   
                DCD     HardFaultException        ; Hard Fault Handler   
                DCD     MemManageException        ; MPU Fault Handler   
                DCD     BusFaultException         ; Bus Fault Handler   
                DCD     UsageFaultException       ; Usage Fault Handler   
                DCD     0                         ; Reserved   
                DCD     0                         ; Reserved   
                DCD     0                         ; Reserved   
                DCD     0                         ; Reserved   
                DCD     SVCHandler                ; SVCall Handler   
                DCD     DebugMonitor              ; Debug Monitor Handler   
                DCD     0                         ; Reserved   
                DCD     PendSVC                   ; PendSV Handler   
                DCD     SysTickHandler            ; SysTick Handler      //一大堆的异常处理函数地址   
                ; External Interrupts   
                EXTERN WWDG_IRQHandler   
                EXTERN PVD_IRQHandler   
                EXTERN TAMPER_IRQHandler   
                EXTERN RTC_IRQHandler   
                EXTERN FLASH_IRQHandler   
                EXTERN RCC_IRQHandler   
                EXTERN EXTI0_IRQHandler   
                EXTERN EXTI1_IRQHandler   
                EXTERN EXTI2_IRQHandler   
                EXTERN EXTI3_IRQHandler   
                EXTERN EXTI4_IRQHandler   
                EXTERN DMAChannel1_IRQHandler   
                EXTERN DMAChannel2_IRQHandler   
                EXTERN DMAChannel3_IRQHandler   
                EXTERN DMAChannel4_IRQHandler   
                EXTERN DMAChannel5_IRQHandler   
                EXTERN DMAChannel6_IRQHandler   
                EXTERN DMAChannel7_IRQHandler   
                EXTERN ADC_IRQHandler   
                EXTERN USB_HP_CAN_TX_IRQHandler   
                EXTERN USB_LP_CAN_RX0_IRQHandler   
                EXTERN CAN_RX1_IRQHandler   
                EXTERN CAN_SCE_IRQHandler   
                EXTERN EXTI9_5_IRQHandler   
                EXTERN TIM1_BRK_IRQHandler   
                EXTERN TIM1_UP_IRQHandler   
                EXTERN TIM1_TRG_COM_IRQHandler   
                EXTERN TIM1_CC_IRQHandler   
                EXTERN TIM2_IRQHandler   
                EXTERN TIM3_IRQHandler   
                EXTERN TIM4_IRQHandler   
                EXTERN I2C1_EV_IRQHandler   
                EXTERN I2C1_ER_IRQHandler   
                EXTERN I2C2_EV_IRQHandler   
                EXTERN I2C2_ER_IRQHandler   
                EXTERN SPI1_IRQHandler   
                EXTERN SPI2_IRQHandler   
                EXTERN USART1_IRQHandler   
                EXTERN USART2_IRQHandler   
                EXTERN USART3_IRQHandler   
                EXTERN EXTI15_10_IRQHandler   
                EXTERN RTCAlarm_IRQHandler   
                EXTERN USBWakeUp_IRQHandler                    ;//同上,   
                   
                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     DMAChannel1_IRQHandler    ; DMA Channel 1   
                DCD     DMAChannel2_IRQHandler    ; DMA Channel 2   
                DCD     DMAChannel3_IRQHandler    ; DMA Channel 3   
                DCD     DMAChannel4_IRQHandler    ; DMA Channel 4   
                DCD     DMAChannel5_IRQHandler    ; DMA Channel 5   
                DCD     DMAChannel6_IRQHandler    ; DMA Channel 6   
                DCD     DMAChannel7_IRQHandler    ; DMA Channel 7   
                DCD     ADC_IRQHandler            ; ADC   
                DCD     USB_HP_CAN_TX_IRQHandler ; USB High Priority or CAN TX   
                DCD     USB_LP_CAN_RX0_IRQHandler ; USB Low Priority or CAN RX0   
                DCD     CAN_RX1_IRQHandler        ; CAN RX1   
                DCD     CAN_SCE_IRQHandler        ; CAN 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   ;//同上   
                AREA    |.text|, CODE, READONLY        ;//定义代码段   
; Reset Handler   
Reset_Handler   PROC                             
 ;过程的开始                 
;//Rset_Handler的实现   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,见HELP中[WEAK]   
                IMPORT __main                              ;//导入符号,__main为 运行时库提供的函数;完成堆栈,堆的初始话   
                LDR     R0, =__main                         ;//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                                      
;过程的结束
                ALIGN   
; User Initial Stack & Heap   
                IF      :DEF:__MICROLIB                     ;//如果使用micro lib,micro lib 描述见armlib.chm   
                   

                EXPORT __heap_base   
                EXPORT __heap_limit                        ;//只导出几个定义   
                   
                ELSE                                        ;//如果使用默认C运行时库   
                   
                IMPORT __use_two_region_memory   
                EXPORT __user_initial_stackheap   
__user_initial_stackheap                                    ;//则进行堆栈和堆的赋值,在__main函数执行过程中调用。   
                LDR     R0, = Heap_Mem   
                LDR     R1, =(Stack_Mem + Stack_Size)   
                LDR     R2, = (Heap_Mem + Heap_Size)   
                LDR     R3, = Stack_Mem   
                BX      LR   
                ALIGN   
                ENDIF   
                END                                         ;//OK ,完了 

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qiya0104
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