STM32F4啟動程式碼分析
阿新 • • 發佈：2019-01-23
;******************** (C) COPYRIGHT 2014 STMicroelectronics ******************** ;* File Name : startup_stm32f40_41xxx.s ;* Author : MCD Application Team ;* @version : V1.4.0 ;* @date : 04-August-2014 ;* Description : STM32F40xxx/41xxx 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 system clock and the external SRAM mounted on ;* STM324xG-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 CortexM4 processor is in Thread mode, ;* priority is Privileged, and the Stack is set to Main. ;* <<< Use Configuration Wizard in Context Menu >>> ;******************************************************************************* ; ; Licensed under MCD-ST Liberty SW License Agreement V2, (the "License"); ; You may not use this file except in compliance with the License. ; You may obtain a copy of the License at: ; ; http://www.st.com/software_license_agreement_liberty_v2 ; ; Unless required by applicable law or agreed to in writing, software ; distributed under the License is distributed on an "AS IS" BASIS, ; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ; See the License for the specific language governing permissions and ; limitations under the License. ; ;******************************************************************************* ; 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 0x00000400 ;開闢棧的大小為0x00000400（1KB） AREA STACK, NOINIT, READWRITE, ALIGN=3 ;一個新的程式碼段或者資料段。STACK表示段名，這個可以任意命名； ;NOINIT表示不初始化；READWRITE表示可讀可寫，ALIGN=3，表示按照2^3對齊，即8位元組對齊。 Stack_Mem SPACE Stack_Size ;分配一定大小的記憶體空間，單位為位元組。這裡指定大小等於Stack_Size __initial_sp ;表示棧的結束地址，即棧頂地址，棧是由高向低生長的。 ; <h> Heap Configuration ; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8> ; </h> Heap_Size EQU 0x00000200 ;;開闢堆的大小為0x00000200（512位元組） AREA HEAP, NOINIT, READWRITE, ALIGN=3 ;名字為HEAP，NOINIT即不初始化，可讀可寫，8（2^3）位元組對齊。 __heap_base ;__heap_base表示堆的起始地址 Heap_Mem SPACE Heap_Size ; 分配一定大小的記憶體空間 __heap_limit ;__heap_limit表示堆的結束地址。堆是由低向高生長的，跟棧的生長方向相反。 PRESERVE8 ; 指定當前檔案的堆疊按照8位元組對齊 THUMB ;後面指令相容THUMB指令,THUBM是ARM以前的指令集，16bit， ;現在Cortex-M系列的都使用THUMB-2指令集，THUMB-2是32位的，相容16位和32位的指令，是THUMB的超級。 ; Vector Table Mapped to Address 0 at Reset AREA RESET, DATA, READONLY ;定義一個數據段，名字為RESET，可讀。 EXPORT __Vectors ;宣告 __Vectors、__Vectors_End和__Vectors_Size這三個標號具有全域性屬性，可供外部的檔案呼叫 EXPORT __Vectors_End EXPORT __Vectors_Size __Vectors DCD __initial_sp ; Top of Stack ;向量表起始地址 DCD Reset_Handler ; Reset Handler ;分配一個或者多個以字為單位的記憶體，以四位元組對齊，並要求初始化這些記憶體。 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 ; 0 表示保留 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 detection DCD TAMP_STAMP_IRQHandler ; Tamper and TimeStamps through the EXTI line DCD RTC_WKUP_IRQHandler ; RTC Wakeup through the EXTI line DCD FLASH_IRQHandler ; FLASH DCD RCC_IRQHandler ; RCC DCD EXTI0_IRQHandler ; EXTI Line0 DCD EXTI1_IRQHandler ; EXTI Line1 DCD EXTI2_IRQHandler ; EXTI Line2 DCD EXTI3_IRQHandler ; EXTI Line3 DCD EXTI4_IRQHandler ; EXTI Line4 DCD DMA1_Stream0_IRQHandler ; DMA1 Stream 0 DCD DMA1_Stream1_IRQHandler ; DMA1 Stream 1 DCD DMA1_Stream2_IRQHandler ; DMA1 Stream 2 DCD DMA1_Stream3_IRQHandler ; DMA1 Stream 3 DCD DMA1_Stream4_IRQHandler ; DMA1 Stream 4 DCD DMA1_Stream5_IRQHandler ; DMA1 Stream 5 DCD DMA1_Stream6_IRQHandler ; DMA1 Stream 6 DCD ADC_IRQHandler ; ADC1, ADC2 and ADC3s DCD CAN1_TX_IRQHandler ; CAN1 TX DCD CAN1_RX0_IRQHandler ; CAN1 RX0 DCD CAN1_RX1_IRQHandler ; CAN1 RX1 DCD CAN1_SCE_IRQHandler ; CAN1 SCE DCD EXTI9_5_IRQHandler ; External Line[9:5]s DCD TIM1_BRK_TIM9_IRQHandler ; TIM1 Break and TIM9 DCD TIM1_UP_TIM10_IRQHandler ; TIM1 Update and TIM10 DCD TIM1_TRG_COM_TIM11_IRQHandler ; TIM1 Trigger and Commutation and TIM11 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 ; External Line[15:10]s DCD RTC_Alarm_IRQHandler ; RTC Alarm (A and B) through EXTI Line DCD OTG_FS_WKUP_IRQHandler ; USB OTG FS Wakeup through EXTI line DCD TIM8_BRK_TIM12_IRQHandler ; TIM8 Break and TIM12 DCD TIM8_UP_TIM13_IRQHandler ; TIM8 Update and TIM13 DCD TIM8_TRG_COM_TIM14_IRQHandler ; TIM8 Trigger and Commutation and TIM14 DCD TIM8_CC_IRQHandler ; TIM8 Capture Compare DCD DMA1_Stream7_IRQHandler ; DMA1 Stream7 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_DAC_IRQHandler ; TIM6 and DAC1&2 underrun errors DCD TIM7_IRQHandler ; TIM7 DCD DMA2_Stream0_IRQHandler ; DMA2 Stream 0 DCD DMA2_Stream1_IRQHandler ; DMA2 Stream 1 DCD DMA2_Stream2_IRQHandler ; DMA2 Stream 2 DCD DMA2_Stream3_IRQHandler ; DMA2 Stream 3 DCD DMA2_Stream4_IRQHandler ; DMA2 Stream 4 DCD ETH_IRQHandler ; Ethernet DCD ETH_WKUP_IRQHandler ; Ethernet Wakeup through EXTI line DCD CAN2_TX_IRQHandler ; CAN2 TX DCD CAN2_RX0_IRQHandler ; CAN2 RX0 DCD CAN2_RX1_IRQHandler ; CAN2 RX1 DCD CAN2_SCE_IRQHandler ; CAN2 SCE DCD OTG_FS_IRQHandler ; USB OTG FS DCD DMA2_Stream5_IRQHandler ; DMA2 Stream 5 DCD DMA2_Stream6_IRQHandler ; DMA2 Stream 6 DCD DMA2_Stream7_IRQHandler ; DMA2 Stream 7 DCD USART6_IRQHandler ; USART6 DCD I2C3_EV_IRQHandler ; I2C3 event DCD I2C3_ER_IRQHandler ; I2C3 error DCD OTG_HS_EP1_OUT_IRQHandler ; USB OTG HS End Point 1 Out DCD OTG_HS_EP1_IN_IRQHandler ; USB OTG HS End Point 1 In DCD OTG_HS_WKUP_IRQHandler ; USB OTG HS Wakeup through EXTI DCD OTG_HS_IRQHandler ; USB OTG HS DCD DCMI_IRQHandler ; DCMI DCD CRYP_IRQHandler ; CRYP crypto DCD HASH_RNG_IRQHandler ; Hash and Rng DCD FPU_IRQHandler ; FPU __Vectors_End ;向量表結束地址 __Vectors_Size EQU __Vectors_End - __Vectors ;兩個相減即可算出向量表大小。 AREA |.text|, CODE, READONLY ;定義一個名稱為.text的程式碼段，可讀。 ; Reset handler Reset_Handler PROC ;復位子程式是系統上電後第一個執行的程式，呼叫System ;後呼叫C庫函式_mian，最終呼叫main函式去到C的世界。 ;PROC 是子程式定義偽指令 EXPORT Reset_Handler [WEAK] ;WEAK：表示弱定義，如果外部檔案優先定義了該標號則首先引用該標號，如果外部 ;檔案沒有宣告也不會出錯。這裡表示復位子程式可以由使用者在其他檔案重新實現，這裡並 ;不是唯一的。 IMPORT SystemInit ;IMPORT：表示該標號來自外部檔案，跟C語言中的EXTERN關鍵字類似。 IMPORT __main LDR R0, =SystemInit ;把 SystemInit 的地址載入到暫存器 R0 BLX R0 ;程式跳轉到 R0 中的地址執行程式，即執行SystemInit函式的內容 LDR R0, =__main ;把__main 的地址載入到暫存器 R0。 BX R0 ;程式跳轉到 R0 中的地址執行程式，即執行__main函式,進入main函式 ENDP ;子程式的結束 ; Dummy Exception Handlers (infinite loops which can be modified) ;在啟動檔案裡面已經幫我們寫好所有中斷的中斷服務函式，跟我們平時寫的中斷服務 ;函式不一樣的就是這些函式都是空的，真正的中斷復服務程式需要我們在外部的C檔案裡 ;面重新實現，這裡只是提前佔了一個位置而已。 ;如果我們在使用某個外設的時候，開啟了某個中斷，但是又忘記編寫配套的中斷服務 ;程式或者函式名寫錯，那當中斷來臨的時，程式就會跳轉到啟動檔案預先寫好的空的中斷 ;服務程式中，並且在這個空函式中無線迴圈，即程式就死在這裡。 NMI_Handler PROC ;系統異常 EXPORT NMI_Handler [WEAK] B . ;B：跳轉到一個標號。這裡跳轉到一個‘.’，即表示無線迴圈。 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 PendSV_Handler PROC EXPORT PendSV_Handler [WEAK] B . ENDP SysTick_Handler PROC EXPORT SysTick_Handler [WEAK] B . ENDP Default_Handler PROC ;外部中斷 EXPORT WWDG_IRQHandler [WEAK] EXPORT PVD_IRQHandler [WEAK] EXPORT TAMP_STAMP_IRQHandler [WEAK] EXPORT RTC_WKUP_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_Stream0_IRQHandler [WEAK] EXPORT DMA1_Stream1_IRQHandler [WEAK] EXPORT DMA1_Stream2_IRQHandler [WEAK] EXPORT DMA1_Stream3_IRQHandler [WEAK] EXPORT DMA1_Stream4_IRQHandler [WEAK] EXPORT DMA1_Stream5_IRQHandler [WEAK] EXPORT DMA1_Stream6_IRQHandler [WEAK] EXPORT ADC_IRQHandler [WEAK] EXPORT CAN1_TX_IRQHandler [WEAK] EXPORT CAN1_RX0_IRQHandler [WEAK] EXPORT CAN1_RX1_IRQHandler [WEAK] EXPORT CAN1_SCE_IRQHandler [WEAK] EXPORT EXTI9_5_IRQHandler [WEAK] EXPORT TIM1_BRK_TIM9_IRQHandler [WEAK] EXPORT TIM1_UP_TIM10_IRQHandler [WEAK] EXPORT TIM1_TRG_COM_TIM11_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 RTC_Alarm_IRQHandler [WEAK] EXPORT OTG_FS_WKUP_IRQHandler [WEAK] EXPORT TIM8_BRK_TIM12_IRQHandler [WEAK] EXPORT TIM8_UP_TIM13_IRQHandler [WEAK] EXPORT TIM8_TRG_COM_TIM14_IRQHandler [WEAK] EXPORT TIM8_CC_IRQHandler [WEAK] EXPORT DMA1_Stream7_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_DAC_IRQHandler [WEAK] EXPORT TIM7_IRQHandler [WEAK] EXPORT DMA2_Stream0_IRQHandler [WEAK] EXPORT DMA2_Stream1_IRQHandler [WEAK] EXPORT DMA2_Stream2_IRQHandler [WEAK] EXPORT DMA2_Stream3_IRQHandler [WEAK] EXPORT DMA2_Stream4_IRQHandler [WEAK] EXPORT ETH_IRQHandler [WEAK] EXPORT ETH_WKUP_IRQHandler [WEAK] EXPORT CAN2_TX_IRQHandler [WEAK] EXPORT CAN2_RX0_IRQHandler [WEAK] EXPORT CAN2_RX1_IRQHandler [WEAK] EXPORT CAN2_SCE_IRQHandler [WEAK] EXPORT OTG_FS_IRQHandler [WEAK] EXPORT DMA2_Stream5_IRQHandler [WEAK] EXPORT DMA2_Stream6_IRQHandler [WEAK] EXPORT DMA2_Stream7_IRQHandler [WEAK] EXPORT USART6_IRQHandler [WEAK] EXPORT I2C3_EV_IRQHandler [WEAK] EXPORT I2C3_ER_IRQHandler [WEAK] EXPORT OTG_HS_EP1_OUT_IRQHandler [WEAK] EXPORT OTG_HS_EP1_IN_IRQHandler [WEAK] EXPORT OTG_HS_WKUP_IRQHandler [WEAK] EXPORT OTG_HS_IRQHandler [WEAK] EXPORT DCMI_IRQHandler [WEAK] EXPORT CRYP_IRQHandler [WEAK] EXPORT HASH_RNG_IRQHandler [WEAK] EXPORT FPU_IRQHandler [WEAK] WWDG_IRQHandler PVD_IRQHandler TAMP_STAMP_IRQHandler RTC_WKUP_IRQHandler FLASH_IRQHandler RCC_IRQHandler EXTI0_IRQHandler EXTI1_IRQHandler EXTI2_IRQHandler EXTI3_IRQHandler EXTI4_IRQHandler DMA1_Stream0_IRQHandler DMA1_Stream1_IRQHandler DMA1_Stream2_IRQHandler DMA1_Stream3_IRQHandler DMA1_Stream4_IRQHandler DMA1_Stream5_IRQHandler DMA1_Stream6_IRQHandler ADC_IRQHandler CAN1_TX_IRQHandler CAN1_RX0_IRQHandler CAN1_RX1_IRQHandler CAN1_SCE_IRQHandler EXTI9_5_IRQHandler TIM1_BRK_TIM9_IRQHandler TIM1_UP_TIM10_IRQHandler TIM1_TRG_COM_TIM11_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 RTC_Alarm_IRQHandler OTG_FS_WKUP_IRQHandler TIM8_BRK_TIM12_IRQHandler TIM8_UP_TIM13_IRQHandler TIM8_TRG_COM_TIM14_IRQHandler TIM8_CC_IRQHandler DMA1_Stream7_IRQHandler FSMC_IRQHandler SDIO_IRQHandler TIM5_IRQHandler SPI3_IRQHandler UART4_IRQHandler UART5_IRQHandler TIM6_DAC_IRQHandler TIM7_IRQHandler DMA2_Stream0_IRQHandler DMA2_Stream1_IRQHandler DMA2_Stream2_IRQHandler DMA2_Stream3_IRQHandler DMA2_Stream4_IRQHandler ETH_IRQHandler ETH_WKUP_IRQHandler CAN2_TX_IRQHandler CAN2_RX0_IRQHandler CAN2_RX1_IRQHandler CAN2_SCE_IRQHandler OTG_FS_IRQHandler DMA2_Stream5_IRQHandler DMA2_Stream6_IRQHandler DMA2_Stream7_IRQHandler USART6_IRQHandler I2C3_EV_IRQHandler I2C3_ER_IRQHandler OTG_HS_EP1_OUT_IRQHandler OTG_HS_EP1_IN_IRQHandler OTG_HS_WKUP_IRQHandler OTG_HS_IRQHandler DCMI_IRQHandler CRYP_IRQHandler HASH_RNG_IRQHandler FPU_IRQHandler B . ENDP ALIGN ;ALIGN：對指令或者資料存放的地址進行對齊，後面會跟一個立即數。預設表示4位元組對齊。 ;******************************************************************************* ; User Stack and Heap initialization ;使用者棧和堆初始化 ;******************************************************************************* ;判斷是否定義了__MICROLIB ，如果定義了則賦予標號__initial_sp（棧頂地址）、 ;__heap_base（堆起始地址）、__heap_limit（堆結束地址）全域性屬性，可供外部檔案呼叫。 ;如果沒有定義（實際的情況就是我們沒定義__MICROLIB）則使用預設的C庫，然後初始 ;化使用者堆疊大小，這部分有C庫函式__main來完成，當初始化完堆疊之後，就呼叫main ;函式去到C的世界。 IF :DEF:__MICROLIB EXPORT __initial_sp EXPORT __heap_base EXPORT __heap_limit ELSE IMPORT __use_two_region_memory EXPORT __user_initial_stackheap __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 ALIGN ENDIF END ;************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE*****