startup_stm32f40_41xxx.s启动代码分析，不看肯定后悔

  因为使用的开发板是stm32f407discovery，所以启动代码为st公司的官方库文件里的startup_stm32f40_41xxx.s，至于如何去找官方库文件，不在本节讨论的范围内，本节只是初步的分析startup_stm32f40_41xxx.s，其中更深入的东西需要在以后的章节中分析。
在startup_stm32f40_41xxx.s中，有一段注释：
;* File Name : startup_stm32f40_41xxx.s
;* Author : MCD Application Team
;* @version : V1.7.0
;* @date : 22-April-2016
;* Description : STM32F40xxx/41xxx devices vector table for EWARM toolchain.
;* This module performs:
;* - Set the initial SP
;* - Set the initial PC == _iar_program_start,
;* - 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 Cortex-M4 processor is in Thread mode,
;* priority is Privileged, and the Stack is set to Main.
这一段重点介绍了这段启动代码干了些什么
1、初始化SP(堆栈指针)
2、将PC(程序指针)设置为_iar_program_start
3、设置中断向量表的地址
4、配置系统时钟，并且将挂载外部SRAM作为数据存储器
5、跳转到main函数执行C库
通过以上的解释，我们大体可以了解startup_stm32f40_41xxx.s的功能，下面我们开始正式的代码分析：
MODULE ?cstartup
  ;; Forward declaration of sections.
SECTION CSTACK:DATA:NOROOT(3)
  SECTION .intvec:CODE:NOROOT(2)
  EXTERN __iar_program_start
EXTERN SystemInit
PUBLIC __vector_table
  DATA
相信看了上面这段代码，你一定开始懵逼（包括我也是）原因是对指令的不熟悉，具体指令请参考EWARM_AssemblerReference.ENU.pdf（不在此次分析的范围），下面我大体解释一下每句含义：
这一段的作用类似于C语言的头文件
;;格式：PROGRAM symbol-------symbol为模块的名字（如?cstartup），PROGRAM 为指令关键子（如MODULE）
MODULE ?cstartup ;;标志汇编模块的开始，使用方法如下
  ;; Forward declaration of sections. ;;段前置声明（类似于c语言中定义一个函数在使用前需要声明一下）
;;格式：SECTION section :type [flag] [(align)]  
;;NOROOT表示如果这个段里的标号（如CSTACK/ .intvec）没有引用，则被舍弃；ROOT表示不舍弃
;;(1)表示字节对其，(2)表示4字节对其，(3)表示8字节对其
SECTION CSTACK:DATA:NOROOT(3);;定义CSTACK数据段
  SECTION .intvec:CODE:NOROOT(2);;定义.intvec代码段
;;以上如想深入了解参看stm32f4xx_flash.icf
  EXTERN __iar_program_start;;声明外部函数，此函数是iar的官方库函数，无法看到函数原型
EXTERN SystemInit;;声明外部函数，主要功能是设置初始化系统时钟，配置SRAM
PUBLIC __vector_table;;类似于全局变量，外部可以调用
  DATA
  __vector_table
;;格式：DCD expr [,expr] …  ;Generates 32-bit constants.生成32bit常数  
DCD sfe(CSTACK);;格式：SFE (section [{+ | -} offset])  返回section段结束地址，SFB(section)返回section段开始地址;  
DCD Reset_Handler ; Reset Handler
  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
  ; 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
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;;
;; Default interrupt handlers.
;;
THUMB ;;使用thumb指令集
PUBWEAK Reset_Handler;;弱定义一个函数，当复位异常时跳转到Reset_Handler
SECTION .text:CODE:REORDER:NOROOT(2)
Reset_Handler
  LDR R0, =SystemInit
BLX R0 ;;跳转到SystemInit，进行系统时钟的初始化
LDR R0, =__iar_program_start
BX R0;;跳转到__iar_program_start，此函数不可见
  PUBWEAK NMI_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
NMI_Handler
B NMI_Handler
  PUBWEAK HardFault_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
HardFault_Handler
B HardFault_Handler
  PUBWEAK MemManage_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
MemManage_Handler
B MemManage_Handler
  PUBWEAK BusFault_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
BusFault_Handler
B BusFault_Handler
  PUBWEAK UsageFault_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
UsageFault_Handler
B UsageFault_Handler
  PUBWEAK SVC_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
SVC_Handler
B SVC_Handler
  PUBWEAK DebugMon_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
DebugMon_Handler
B DebugMon_Handler
  PUBWEAK PendSV_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
PendSV_Handler
B PendSV_Handler
  PUBWEAK SysTick_Handler
SECTION .text:CODE:REORDER:NOROOT(1)
SysTick_Handler
B SysTick_Handler
  PUBWEAK WWDG_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
WWDG_IRQHandler
B WWDG_IRQHandler
  PUBWEAK PVD_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
PVD_IRQHandler
B PVD_IRQHandler
  PUBWEAK TAMP_STAMP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TAMP_STAMP_IRQHandler
B TAMP_STAMP_IRQHandler
  PUBWEAK RTC_WKUP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
RTC_WKUP_IRQHandler
B RTC_WKUP_IRQHandler
  PUBWEAK FLASH_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
FLASH_IRQHandler
B FLASH_IRQHandler
  PUBWEAK RCC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
RCC_IRQHandler
B RCC_IRQHandler
  PUBWEAK EXTI0_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI0_IRQHandler
B EXTI0_IRQHandler
  PUBWEAK EXTI1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI1_IRQHandler
B EXTI1_IRQHandler
  PUBWEAK EXTI2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI2_IRQHandler
B EXTI2_IRQHandler
  PUBWEAK EXTI3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI3_IRQHandler
B EXTI3_IRQHandler
  PUBWEAK EXTI4_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI4_IRQHandler
B EXTI4_IRQHandler
  PUBWEAK DMA1_Stream0_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream0_IRQHandler
B DMA1_Stream0_IRQHandler
  PUBWEAK DMA1_Stream1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream1_IRQHandler
B DMA1_Stream1_IRQHandler
  PUBWEAK DMA1_Stream2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream2_IRQHandler
B DMA1_Stream2_IRQHandler
  PUBWEAK DMA1_Stream3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream3_IRQHandler
B DMA1_Stream3_IRQHandler
  PUBWEAK DMA1_Stream4_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream4_IRQHandler
B DMA1_Stream4_IRQHandler
  PUBWEAK DMA1_Stream5_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream5_IRQHandler
B DMA1_Stream5_IRQHandler
  PUBWEAK DMA1_Stream6_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream6_IRQHandler
B DMA1_Stream6_IRQHandler
  PUBWEAK ADC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
ADC_IRQHandler
B ADC_IRQHandler
  PUBWEAK CAN1_TX_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN1_TX_IRQHandler
B CAN1_TX_IRQHandler
  PUBWEAK CAN1_RX0_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN1_RX0_IRQHandler
B CAN1_RX0_IRQHandler
  PUBWEAK CAN1_RX1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN1_RX1_IRQHandler
B CAN1_RX1_IRQHandler
  PUBWEAK CAN1_SCE_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN1_SCE_IRQHandler
B CAN1_SCE_IRQHandler
  PUBWEAK EXTI9_5_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI9_5_IRQHandler
B EXTI9_5_IRQHandler
  PUBWEAK TIM1_BRK_TIM9_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM1_BRK_TIM9_IRQHandler
B TIM1_BRK_TIM9_IRQHandler
  PUBWEAK TIM1_UP_TIM10_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM1_UP_TIM10_IRQHandler
B TIM1_UP_TIM10_IRQHandler
  PUBWEAK TIM1_TRG_COM_TIM11_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM1_TRG_COM_TIM11_IRQHandler
B TIM1_TRG_COM_TIM11_IRQHandler
PUBWEAK TIM1_CC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM1_CC_IRQHandler
B TIM1_CC_IRQHandler
  PUBWEAK TIM2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM2_IRQHandler
B TIM2_IRQHandler
  PUBWEAK TIM3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM3_IRQHandler
B TIM3_IRQHandler
  PUBWEAK TIM4_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM4_IRQHandler
B TIM4_IRQHandler
  PUBWEAK I2C1_EV_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C1_EV_IRQHandler
B I2C1_EV_IRQHandler
  PUBWEAK I2C1_ER_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C1_ER_IRQHandler
B I2C1_ER_IRQHandler
  PUBWEAK I2C2_EV_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C2_EV_IRQHandler
B I2C2_EV_IRQHandler
  PUBWEAK I2C2_ER_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C2_ER_IRQHandler
B I2C2_ER_IRQHandler
  PUBWEAK SPI1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
SPI1_IRQHandler
B SPI1_IRQHandler
  PUBWEAK SPI2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
SPI2_IRQHandler
B SPI2_IRQHandler
  PUBWEAK USART1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
USART1_IRQHandler
B USART1_IRQHandler
  PUBWEAK USART2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
USART2_IRQHandler
B USART2_IRQHandler
  PUBWEAK USART3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
USART3_IRQHandler
B USART3_IRQHandler
  PUBWEAK EXTI15_10_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
EXTI15_10_IRQHandler
B EXTI15_10_IRQHandler
  PUBWEAK RTC_Alarm_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
RTC_Alarm_IRQHandler
B RTC_Alarm_IRQHandler
  PUBWEAK OTG_FS_WKUP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_FS_WKUP_IRQHandler
B OTG_FS_WKUP_IRQHandler
PUBWEAK TIM8_BRK_TIM12_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM8_BRK_TIM12_IRQHandler
B TIM8_BRK_TIM12_IRQHandler
  PUBWEAK TIM8_UP_TIM13_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM8_UP_TIM13_IRQHandler
B TIM8_UP_TIM13_IRQHandler
  PUBWEAK TIM8_TRG_COM_TIM14_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM8_TRG_COM_TIM14_IRQHandler
B TIM8_TRG_COM_TIM14_IRQHandler
  PUBWEAK TIM8_CC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM8_CC_IRQHandler
B TIM8_CC_IRQHandler
  PUBWEAK DMA1_Stream7_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA1_Stream7_IRQHandler
B DMA1_Stream7_IRQHandler
  PUBWEAK FSMC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
FSMC_IRQHandler
B FSMC_IRQHandler
  PUBWEAK SDIO_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
SDIO_IRQHandler
B SDIO_IRQHandler
  PUBWEAK TIM5_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM5_IRQHandler
B TIM5_IRQHandler
  PUBWEAK SPI3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
SPI3_IRQHandler
B SPI3_IRQHandler
  PUBWEAK UART4_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
UART4_IRQHandler
B UART4_IRQHandler
  PUBWEAK UART5_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
UART5_IRQHandler
B UART5_IRQHandler
  PUBWEAK TIM6_DAC_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM6_DAC_IRQHandler
B TIM6_DAC_IRQHandler
  PUBWEAK TIM7_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
TIM7_IRQHandler
B TIM7_IRQHandler
  PUBWEAK DMA2_Stream0_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream0_IRQHandler
B DMA2_Stream0_IRQHandler
  PUBWEAK DMA2_Stream1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream1_IRQHandler
B DMA2_Stream1_IRQHandler
  PUBWEAK DMA2_Stream2_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream2_IRQHandler
B DMA2_Stream2_IRQHandler
  PUBWEAK DMA2_Stream3_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream3_IRQHandler
B DMA2_Stream3_IRQHandler
  PUBWEAK DMA2_Stream4_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream4_IRQHandler
B DMA2_Stream4_IRQHandler
  PUBWEAK ETH_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
ETH_IRQHandler
B ETH_IRQHandler
  PUBWEAK ETH_WKUP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
ETH_WKUP_IRQHandler
B ETH_WKUP_IRQHandler
  PUBWEAK CAN2_TX_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN2_TX_IRQHandler
B CAN2_TX_IRQHandler
  PUBWEAK CAN2_RX0_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN2_RX0_IRQHandler
B CAN2_RX0_IRQHandler
  PUBWEAK CAN2_RX1_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN2_RX1_IRQHandler
B CAN2_RX1_IRQHandler
  PUBWEAK CAN2_SCE_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CAN2_SCE_IRQHandler
B CAN2_SCE_IRQHandler
  PUBWEAK OTG_FS_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_FS_IRQHandler
B OTG_FS_IRQHandler
  PUBWEAK DMA2_Stream5_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream5_IRQHandler
B DMA2_Stream5_IRQHandler
  PUBWEAK DMA2_Stream6_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream6_IRQHandler
B DMA2_Stream6_IRQHandler
  PUBWEAK DMA2_Stream7_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DMA2_Stream7_IRQHandler
B DMA2_Stream7_IRQHandler
  PUBWEAK USART6_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
USART6_IRQHandler
B USART6_IRQHandler
  PUBWEAK I2C3_EV_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C3_EV_IRQHandler
B I2C3_EV_IRQHandler
  PUBWEAK I2C3_ER_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
I2C3_ER_IRQHandler
B I2C3_ER_IRQHandler
  PUBWEAK OTG_HS_EP1_OUT_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_HS_EP1_OUT_IRQHandler
B OTG_HS_EP1_OUT_IRQHandler
  PUBWEAK OTG_HS_EP1_IN_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_HS_EP1_IN_IRQHandler
B OTG_HS_EP1_IN_IRQHandler
  PUBWEAK OTG_HS_WKUP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_HS_WKUP_IRQHandler
B OTG_HS_WKUP_IRQHandler
  PUBWEAK OTG_HS_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
OTG_HS_IRQHandler
B OTG_HS_IRQHandler
  PUBWEAK DCMI_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
DCMI_IRQHandler
B DCMI_IRQHandler
  PUBWEAK CRYP_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
CRYP_IRQHandler
B CRYP_IRQHandler
  PUBWEAK HASH_RNG_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
HASH_RNG_IRQHandler
B HASH_RNG_IRQHandler
  PUBWEAK FPU_IRQHandler
SECTION .text:CODE:REORDER:NOROOT(1)
FPU_IRQHandler
B FPU_IRQHandler
  END
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
此次分析只是面上，具体其中的细节，请看下次分析，如有不对之处，希望各位大神指出