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这里以stm32f103为硬件平台,搭建了stm32f1系列的标准库,版本是V3.5,在路径标准库的源码路径下LibrariesCMSISCM3DeviceSupportSTSTM32F10xstartup包含了各种编译器或者说IDE的启动文件:
这些IDE分别是arm,gcc_ride7,iar,TrueSTUDIO,这不是重点的重点,本文主要分析startup_stm32f10x_md.s。 分析startup_stm32f10x_md.s 首先看一下arm文件夹下的文件,具体如下; -ar--- 2011/3/10 10:52 15766 startup_stm32f10x_cl.s -ar--- 2011/3/10 10:52 15503 startup_stm32f10x_hd.s -ar--- 2011/3/10 10:52 15692 startup_stm32f10x_hd_vl.s -ar--- 2011/3/10 10:52 12376 startup_stm32f10x_ld.s -ar--- 2011/3/10 10:52 13656 startup_stm32f10x_ld_vl.s -ar--- 2011/3/10 10:52 12765 startup_stm32f10x_md.s -ar--- 2011/3/10 10:51 14073 startup_stm32f10x_md_vl.s -ar--- 2011/3/10 10:51 15955 startup_stm32f10x_xl.s 下面可以看到文件最终确定是_xl, md等等,这些需要根据芯片具体的能力不同进行选择; 下面看一下startup_m32f10x_st.s的代码,另外一般用户的代码都是从main()函数开始的,但在此之前,则有启动代码初始化化硬件环境,然后跳转到c runtime lib的__main中,进行运行环境的初始化,包括栈,堆等等,最终跳转到用户的main函数中。这里没有找到c runtime lib的源码,有点实际的遗憾。 在分析源码中,有对部分结构指令之后进行简单的,参考了《Cortex_M3 核心指南》 了解细节 EQU 将一个变量设置,例如:Stack_Size EQU 0x00000400| AREA 用于定义一个代码段或数据段,具体最佳如:AREA 段名称{,参数1} {,参数2}... SPACE 用于申请区块内存空间但不赋初值,例如:Stack_Mem SPACE 0x00000400,分配1024字节的内存控制,感觉对应malloc,Stack_Mem应该会该内存空间的首地址; DCD 用于分配连续的字存储单元并用伪指令中指定的表达式初始化 PROC 该伪指令用于定义子程序,位置子程序的开始处,它和ENDP分别表示子程序定义的开始和结束加热必须成对出现; LDR 从那里加载字到一个寄存器中,加载数据到注册 常见的转移指令
LR寄存器,连接寄存器的英文缩写,在ARM结构中LR的特殊用途有两种:源码分析 下面参考一下startup_stm32f10x_md.s的源码,进行分析一下。 ;******************** (C) COPYRIGHT 2011 STMicroelectronics ******************** ;* File Name : startup_stm32f10x_md.s ;* Author : MCD Application Team ;* Version : V3.5.0 ;* Date : 11-March-2011 ;* Description : STM32F10x Medium Density 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 ;* - 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 ;栈空间 1024 Bytes,1K的空间 ;分配数据段,命名为`STACK`,数据段未初始化,可以读写 AREA STACK, NOINIT, READWRITE, ALIGN=3 ; Stack_Mem SPACE Stack_Size __initial_sp ; ; ; Heap_Size EQU 0x00000200 ;堆空间的配置,512 字节的空间 AREA HEAP, NOINIT, READWRITE, ALIGN=3 __heap_base Heap_Mem SPACE Heap_Size ;分配堆空间为 512字节 __heap_limit PRESERVE8 THUMB ; Vector Table Mapped to Address 0 at Reset ;向量表映射到地址0x00000000 AREA RESET, DATA, READONLY EXPORT __Vectors ;导出__Vectors符号,用于外部文件的使用 EXPORT __Vectors_End ;导出向量表的结束地址 EXPORT __Vectors_Size ;导出向量表的大小 ;使用DCD为__initial_sp以及异常地址分配内存空间,存到向量表中 __Vectors DCD __initial_sp ; Top of Stack 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 ; 外设的中断地址 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_2_IRQHandler ; ADC1_2 DCD USB_HP_CAN1_TX_IRQHandler ; USB High Priority or CAN1 TX DCD USB_LP_CAN1_RX0_IRQHandler ; USB Low Priority or CAN1 RX0 DCD CAN1_RX1_IRQHandler ; CAN1 RX1 DCD CAN1_SCE_IRQHandler ; CAN1 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 __Vectors_End __Vectors_Size EQU __Vectors_End - __Vectors ; 计算向量表大小 AREA |.text|, CODE, READONLY ; 分配代码段,只读 ; Reset handler Reset_Handler PROC EXPORT Reset_Handler [WEAK] IMPORT __main IMPORT SystemInit LDR R0, =SystemInit BLX R0 LDR R0, =__main BX R0 ENDP ; Dummy Exception Handlers (infinite loops which can be modified) ; [WEAK]指令会优先使用外部的链接符号,但是没有原型,编译器也不会出现报错 NMI_Handler PROC EXPORT NMI_Handler [WEAK] B . 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 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_2_IRQHandler [WEAK] EXPORT USB_HP_CAN1_TX_IRQHandler [WEAK] EXPORT USB_LP_CAN1_RX0_IRQHandler [WEAK] EXPORT CAN1_RX1_IRQHandler [WEAK] EXPORT CAN1_SCE_IRQHandler [WEAK] EXPORT EXTI9_5_IRQHandler [WEAK] EXPORT TIM1_BRK_IRQHandler [WEAK] EXPORT TIM1_UP_IRQHandler [WEAK] EXPORT TIM1_TRG_COM_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 USBWakeUp_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_2_IRQHandler USB_HP_CAN1_TX_IRQHandler USB_LP_CAN1_RX0_IRQHandler CAN1_RX1_IRQHandler CAN1_SCE_IRQHandler EXTI9_5_IRQHandler TIM1_BRK_IRQHandler TIM1_UP_IRQHandler TIM1_TRG_COM_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 USBWakeUp_IRQHandler B . ENDP ALIGN ;******************************************************************************* ; User Stack and Heap initialization ;******************************************************************************* 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 2011 STMicroelectronics *****END OF FILE*****
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首先,要学习好ARM的汇编语法,这样就可以读懂这个文件的功能,再对应数据手册中的寄存器
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