stm32 启动文件.s源码 分析
; 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 ；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）
; <h> Heap Configuration
; <o> Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
; </h>
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
；DCD指令为各中断向量分配空间
；大小为一个字（32bit）
DCD Reset_Handler ；分配地址为0x00000004
DCD NMI_Handler ; 分配地址0x00000008 不可屏蔽中断
DCD HardFault_Handler ; 地址依次往下累加 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
|.text|用于表示由C编译器生成的代码节，或以某种方式与C库关联的代码节
; Reset handler
Reset_Handler PROC ；定义硬重启中断子程序段.PROC标记一个函数的开始;过程定义伪指令,和ENDP必须成对
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*****