GD32F20x在keil下的启动文件和生成的.map文件分析

只看该作者 · 2016-1-22 17:11

;/**
;  ******************************************************************************
;  * @file startup_gd32f20x_cl.s
;  * @author  MCU SD
;  * @version V1.0.0
;  * @date 15-Jul-2015
;  * @brief gd32f20x startup code.
;  ******************************************************************************
;  */

;/* <<< Use Configuration Wizard in Context Menu >>>                                                       */

; Amount of memory (in bytes) allocated for Stack and Heap
; Tailor those values to your application needs
;// <h> Stack Configuration
;// <o> Stack Size (in Bytes) <0-8192:8>
;// </h>
Stack_Size       EQU    0x400 ；定义栈的大小
               ；伪指令AREA定义一个段，段名为STACK,NOINIT表示未初始化，READWRITE可读写，按照8（2^3）字节对齐
                  AREA STACK, NOINIT, READWRITE, ALIGN = 3
Stack_Mem          SPACE Stack_Size ；分配连续 Stack_Size 字节的存储单元并初始化为 0
__initial_sp                         ；栈顶地址

;// <h> Heap Configuration
;// <o>  Heap Size (in Bytes) <0-4096:8>
;// </h>
Heap_Size          EQU    0x200  ；定义堆的大小
         ；伪指令AREA定义一个段，段名为HEAP,NOINIT表示未初始化，READWRITE可读写，按照8（2^3）字节对齐
                  AREA HEAP, NOINIT, READWRITE, ALIGN = 3
__heap_base  ；堆首地址
Heap_Mem          SPACE Heap_Size ；分配连续 Heap_Size 字节的存储单元并初始化为 0
__heap_limit  ；堆末地址

                  PRESERVE8 ；指示编译器8字节对齐
                  THUMB  ；告诉编译器以后的指令为THUMB指令

; Vector table entries with the exceptions ISR address
                  AREA RESET, DATA, READONLY  ；只读数据段定义
                  EXPORT  __Vectors    ；EXPORT定义一个全局标号__Vectors，这个标号可以在其他文件中引用
                  EXPORT  __Vectors_End  ；EXPORT定义一个全局标号__Vectors_End，这个标号可以在其他文件中引用
                  EXPORT  __Vectors_Size

__Vectors          DCD    __initial_sp                   ; Top of Stack  //DCD命令分配存储空间，并初始化为栈顶指针__initial_sp
                  DCD    Reset_Handler                   ; Vector Number 1,Reset Handler
                  DCD    NMI_Handler                      ; Vector Number 2,NMI Handler
                  DCD    HardFault_Handler                ; Vector Number 3,Hard Fault Handler
                  DCD    MemManage_Handler                ; Vector Number 4,MPU Fault Handler
                  DCD    BusFault_Handler                ; Vector Number 5,Bus Fault Handler
                  DCD    UsageFault_Handler             ; Vector Number 6,Usage Fault Handler
                  DCD    0                               ; Reserved
                  DCD    0                               ; Reserved
                  DCD    0                               ; Reserved
                  DCD    0                               ; Reserved
                  DCD    SVC_Handler                      ; Vector Number 11,SVCall Handler
                  DCD    DebugMon_Handler                ; Vector Number 12,Debug Monitor Handler
                  DCD    0                               ; Reserved
                  DCD    PendSV_Handler                   ; Vector Number 14,PendSV Handler
                  DCD    SysTick_Handler                ; Vector Number 15,SysTick Handler

                  ; External Interrupts
                  DCD    WWDG_IRQHandler                ; Vector Number 16,Window Watchdog
                  DCD    LVD_IRQHandler                   ; Vector Number 17,LVD through EXTI Line detect
                  DCD    TAMPER_IRQHandler                ; Vector Number 18,Tamper Interrupt
                  DCD    RTC_IRQHandler                   ; Vector Number 19,RTC through EXTI Line
                  DCD    FMC_IRQHandler                   ; Vector Number 20,FMC
                  DCD    RCC_IRQHandler                   ; Vector Number 21,RCC
                  DCD    EXTI0_IRQHandler                ; Vector Number 22,EXTI Line 0
                  DCD    EXTI1_IRQHandler                ; Vector Number 23,EXTI Line 1
                  DCD    EXTI2_IRQHandler                ; Vector Number 24,EXTI Line 2
                  DCD    EXTI3_IRQHandler                ; Vector Number 25,EXTI Line 3
                  DCD    EXTI4_IRQHandler                ; Vector Number 26,EXTI Line 4
                  DCD    DMA1_Channel1_IRQHandler       ; Vector Number 27,DMA1 Channel 1
                  DCD    DMA1_Channel2_IRQHandler       ; Vector Number 28,DMA1 Channel 2
                  DCD    DMA1_Channel3_IRQHandler       ; Vector Number 29,DMA1 Channel 3
                  DCD    DMA1_Channel4_IRQHandler       ; Vector Number 30,DMA1 Channel 4
                  DCD    DMA1_Channel5_IRQHandler       ; Vector Number 31,DMA1 Channel 5
                  DCD    DMA1_Channel6_IRQHandler       ; Vector Number 32,DMA1 Channel 6
                  DCD    DMA1_Channel7_IRQHandler       ; Vector Number 33,DMA1 Channel 7
                  DCD    ADC1_2_IRQHandler                ; Vector Number 34,ADC1 and ADC2
                  DCD    CAN1_TX_IRQHandler             ; Vector Number 35,CAN1 TX
                  DCD    CAN1_RX0_IRQHandler             ; Vector Number 36,CAN1 RX0
                  DCD    CAN1_RX1_IRQHandler             ; Vector Number 37,CAN1 RX1
                  DCD    CAN1_SCE_IRQHandler             ; Vector Number 38,CAN1 SCE
                  DCD    EXTI9_5_IRQHandler             ; Vector Number 39,EXTI Line 9..5
                  DCD    TIMER1_BRK_TIMER9_IRQHandler    ; Vector Number 40,TIMER1 Break and TIMER9 global
                  DCD    TIMER1_UP_TIMER10_IRQHandler    ; Vector Number 41,TIMER1 Update and TIMER10 global
                  DCD    TIMER1_TRG_COM_TIMER11_IRQHandler ; Vector Number 42,TIMER1 Break, Update, Trigger and Commutation and TIMER11 global
                  DCD    TIMER1_CC_IRQHandler             ; Vector Number 43,TIMER1 Capture Compare
                  DCD    TIMER2_IRQHandler                ; Vector Number 44,TIMER2
                  DCD    TIMER3_IRQHandler                ; Vector Number 45,TIMER3
                  DCD    TIMER4_IRQHandler                ; Vector Number 46,TIMER4
                  DCD    I2C1_EV_IRQHandler             ; Vector Number 47,I2C1 Event
                  DCD    I2C1_ER_IRQHandler             ; Vector Number 48,I2C1 Error
                  DCD    I2C2_EV_IRQHandler             ; Vector Number 49,I2C2 Event
                  DCD    I2C2_ER_IRQHandler             ; Vector Number 50,I2C1 Error
                  DCD    SPI1_IRQHandler                ; Vector Number 51,SPI1
                  DCD    SPI2_IRQHandler                ; Vector Number 52,SPI2
                  DCD    USART1_IRQHandler                ; Vector Number 53,USART1
                  DCD    USART2_IRQHandler                ; Vector Number 54,USART2
                  DCD    USART3_IRQHandler                ; Vector Number 55,USART3
                  DCD    EXTI15_10_IRQHandler             ; Vector Number 56,External Line[15:10]
                  DCD    RTCAlarm_IRQHandler             ; Vector Number 57,RTC Alarm through EXTI Line
                  DCD    OTG_FS_WKUP_IRQHandler          ; Vector Number 58,USB OTG FS WakeUp from suspend through EXTI Line
                  DCD       TIMER8_BRK_TIMER12_IRQHandler    ; Vector Number 59,TIMER8 Break Interrupt and TIMER12 global
                  DCD       TIMER8_UP_TIMER13_IRQHandler    ; Vector Number 60,TIMER8 Update Interrupt and TIMER13 global
                  DCD       TIMER8_TRG_COM_TIMER14_IRQHandler ; Vector Number 61,TIMER8 Trigger and Commutation Interrupt and TIMER14
                  DCD       TIMER8_CC_IRQHandler             ; Vector Number 62,TIMER8 Capture Compare
                  DCD    ADC3_IRQHandler                ; Vector Number 63,ADC3
                  DCD       EXMC_IRQHandler                ; Vector Number 64,EXMC
                  DCD    SDIO_IRQHandler                ; Vector Number 65,SDIO
                  DCD    TIMER5_IRQHandler                ; Vector Number 66,TIMER5
                  DCD    SPI3_IRQHandler                ; Vector Number 67,SPI3
                  DCD    UART4_IRQHandler                ; Vector Number 68,UART4
                  DCD    UART5_IRQHandler                ; Vector Number 69,UART5
                  DCD    TIMER6_IRQHandler                ; Vector Number 70,TIMER6
                  DCD    TIMER7_IRQHandler                ; Vector Number 71,TIMER7
                  DCD    DMA2_Channel1_IRQHandler       ; Vector Number 72,DMA2 Channel1
                  DCD    DMA2_Channel2_IRQHandler       ; Vector Number 73,DMA2 Channel2
                  DCD    DMA2_Channel3_IRQHandler       ; Vector Number 74,DMA2 Channel3
                  DCD    DMA2_Channel4_IRQHandler       ; Vector Number 75,DMA2 Channel4
                  DCD    DMA2_Channel5_IRQHandler       ; Vector Number 76,DMA2 Channel5
                  DCD    ETH_IRQHandler                   ; Vector Number 77,Ethernet
                  DCD    ETH_WKUP_IRQHandler             ; Vector Number 78,Ethernet Wakeup through EXTI line
                  DCD    CAN2_TX_IRQHandler             ; Vector Number 79,CAN2 TX
                  DCD    CAN2_RX0_IRQHandler             ; Vector Number 80,CAN2 RX0
                  DCD    CAN2_RX1_IRQHandler             ; Vector Number 81,CAN2 RX1
                  DCD    CAN2_SCE_IRQHandler             ; Vector Number 82,CAN2 SCE
                  DCD    OTG_FS_IRQHandler                ; Vector Number 83,USB OTG FS
                  DCD    0                               ; Vector Number 84,Reserved
                  DCD    DMA2_Channel6_IRQHandler       ; Vector Number 85,DMA2 Channel6
                  DCD    DMA2_Channel7_IRQHandler       ; Vector Number 86,DMA2 Channel7
                  DCD    USART6_IRQHandler                ; Vector Number 87,USART6
                  DCD    I2C3_EV_IRQHandler             ; Vector Number 88,I2C3 Event
                  DCD    I2C3_ER_IRQHandler             ; Vector Number 89,I2C3 Error
                  DCD    0                               ; Vector Number 90,Reserved
                  DCD    0                               ; Vector Number 91,Reserved
                  DCD    0                               ; Vector Number 92,Reserved
                  DCD    0                               ; Vector Number 93,Reserved
                  DCD    DCI_IRQHandler                   ; Vector Number 94,DCI
                  DCD    CRYP_IRQHandler                ; Vector Number 95,CRYP
                  DCD    HASH_RNG_IRQHandler             ; Vector Number 96,Hash and Rng
                  DCD    0                               ; Vector Number 97,Reserved
                  DCD    UART7_IRQHandler                ; Vector Number 98,UART7
                  DCD    UART8_IRQHandler                ; Vector Number 99,UART8
                  DCD    0                               ; Vector Number 100,Reserved
                  DCD    0                               ; Vector Number 101,Reserved
                  DCD    0                               ; Vector Number 102,Reserved
                  DCD    0                               ; Vector Number 103,Reserved
                  DCD    TLDI_IRQHandler                ; Vector Number 104,TLDI
                  DCD    TLDI_ER_IRQHandler             ; Vector Number 105,TLDI error
__Vectors_End

__Vectors_Size    EQU  __Vectors_End - __Vectors

只看该作者 · 2016-1-22 17:12

            AREA |.text|, CODE, READONLY ；代码段定义

；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
; Reset handler routine
Reset_Handler    PROC
                  EXPORT  Reset_Handler                   [WEAK] ;[WEAK] 弱定义，意思是如果在别处也定义该标号(函数)，在链接时用别处的地址。
                  ;如果没有其它定方定义，编译器也不报错，以此处地址进行链接
                  IMPORT  __main ;IMPORT通知编译器要使用的标号在其他文件
                  IMPORT  SystemInit
                  LDR    R0, =SystemInit ;装载函数地址SystemInit到寄存器，SystemInit用于时钟初始化
                  BLX    R0
                  LDR    R0, =__main ；_main为运行时库提供的函数；完成堆栈，堆的初始话等工作，会调用下面定义的__user_initial_stackheap
                  ；并在最后跳转到用户自定义的main()函数，来到C的世界
                  BX    R0
                  ENDP

; Dummy Exception Handlers
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  LVD_IRQHandler                   [WEAK]
                  EXPORT  TAMPER_IRQHandler                [WEAK]
                  EXPORT  RTC_IRQHandler                   [WEAK]
                  EXPORT  FMC_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  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  TIMER1_BRK_TIMER9_IRQHandler       [WEAK]
                  EXPORT  TIMER1_UP_TIMER10_IRQHandler       [WEAK]
                  EXPORT  TIMER1_TRG_COM_TIMER11_IRQHandler [WEAK]
                  EXPORT  TIMER1_CC_IRQHandler             [WEAK]
                  EXPORT  TIMER2_IRQHandler                [WEAK]
                  EXPORT  TIMER3_IRQHandler                [WEAK]
                  EXPORT  TIMER4_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  OTG_FS_WKUP_IRQHandler             [WEAK]
                  EXPORT  TIMER8_BRK_TIMER12_IRQHandler    [WEAK]
                  EXPORT  TIMER8_UP_TIMER13_IRQHandler       [WEAK]
                  EXPORT  TIMER8_TRG_COM_TIMER14_IRQHandler [WEAK]
                  EXPORT  TIMER8_CC_IRQHandler             [WEAK]
                  EXPORT  ADC3_IRQHandler                   [WEAK]
                  EXPORT  EXMC_IRQHandler                   [WEAK]
                  EXPORT  SDIO_IRQHandler                   [WEAK]
                  EXPORT  TIMER5_IRQHandler                [WEAK]
                  EXPORT  SPI3_IRQHandler                   [WEAK]
                  EXPORT  UART4_IRQHandler                   [WEAK]
                  EXPORT  UART5_IRQHandler                   [WEAK]
                  EXPORT  TIMER6_IRQHandler                [WEAK]
                  EXPORT  TIMER7_IRQHandler                [WEAK]
                  EXPORT  DMA2_Channel1_IRQHandler          [WEAK]
                  EXPORT  DMA2_Channel2_IRQHandler          [WEAK]
                  EXPORT  DMA2_Channel3_IRQHandler          [WEAK]
                  EXPORT  DMA2_Channel4_IRQHandler          [WEAK]
                  EXPORT  DMA2_Channel5_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_Channel6_IRQHandler          [WEAK]
                  EXPORT  DMA2_Channel7_IRQHandler          [WEAK]
                  EXPORT  USART6_IRQHandler                [WEAK]
                  EXPORT  I2C3_EV_IRQHandler                [WEAK]
                  EXPORT  I2C3_ER_IRQHandler                [WEAK]

                  EXPORT  DCI_IRQHandler                   [WEAK]
                  EXPORT  CRYP_IRQHandler                   [WEAK]
                  EXPORT  HASH_RNG_IRQHandler                [WEAK]

                  EXPORT  UART7_IRQHandler
                  EXPORT  UART8_IRQHandler                   [WEAK]

                  EXPORT  TLDI_IRQHandler                   [WEAK]
                  EXPORT  TLDI_ER_IRQHandler                [WEAK]

WWDG_IRQHandler
LVD_IRQHandler
TAMPER_IRQHandler
RTC_IRQHandler
FMC_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
CAN1_TX_IRQHandler
CAN1_RX0_IRQHandler
CAN1_RX1_IRQHandler
CAN1_SCE_IRQHandler
EXTI9_5_IRQHandler
TIMER1_BRK_TIMER9_IRQHandler
TIMER1_UP_TIMER10_IRQHandler
TIMER1_TRG_COM_TIMER11_IRQHandler
TIMER1_CC_IRQHandler
TIMER2_IRQHandler
TIMER3_IRQHandler
TIMER4_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
OTG_FS_WKUP_IRQHandler
TIMER8_BRK_TIMER12_IRQHandler
TIMER8_UP_TIMER13_IRQHandler
TIMER8_TRG_COM_TIMER14_IRQHandler
TIMER8_CC_IRQHandler
ADC3_IRQHandler
EXMC_IRQHandler
SDIO_IRQHandler
TIMER5_IRQHandler
SPI3_IRQHandler
UART4_IRQHandler
UART5_IRQHandler
TIMER6_IRQHandler
TIMER7_IRQHandler
DMA2_Channel1_IRQHandler
DMA2_Channel2_IRQHandler
DMA2_Channel3_IRQHandler
DMA2_Channel4_IRQHandler
DMA2_Channel5_IRQHandler
ETH_IRQHandler
ETH_WKUP_IRQHandler
CAN2_TX_IRQHandler
CAN2_RX0_IRQHandler
CAN2_RX1_IRQHandler
CAN2_SCE_IRQHandler
OTG_FS_IRQHandler

DMA2_Channel6_IRQHandler
DMA2_Channel7_IRQHandler
USART6_IRQHandler
I2C3_EV_IRQHandler
I2C3_ER_IRQHandler

DCI_IRQHandler
CRYP_IRQHandler
HASH_RNG_IRQHandler

UART7_IRQHandler
UART8_IRQHandler

TLDI_IRQHandler
TLDI_ER_IRQHandler
            B    .
            ENDP

            ALIGN ；填充字节

;*******************************************************************************
; User Stack and Heap initialization
;*******************************************************************************
;堆和栈的初始化
               IF    :DEF:__MICROLIB ;“DEF”的用法——:DEF:X 就是说X定义了则为真，否则为假
                  ;如果定义了MICORLIB,
               ；将__initial_sp、__heap_base、__heap_limit赋予全局属性供外部使用
               EXPORT  __initial_sp
               EXPORT  __heap_base
               EXPORT  __heap_limit

               ELSE

               IMPORT  __use_two_region_memory ;通知编译器要使用的标号在其他文件
               EXPORT  __user_initial_stackheap ;声明全局标号__user_initial_stackheap
;如果使用默认的C库,程序启动过程中就不会执行该标号下的代码
__user_initial_stackheap
               ;进行堆栈和堆的赋值，在__main函数执行过程中调用。
               LDR    R0, =  Heap_Mem  ；保存堆首地址
               LDR    R1, =(Stack_Mem + Stack_Size) ；保持栈的大小
               LDR    R2, = (Heap_Mem +  Heap_Size) ；堆的大小
               LDR    R3, = Stack_Mem  ；栈顶指针
               BX    LR

               ALIGN

               ENDIF

               END

;/******************* (C) COPYRIGHT 2015 GIGADEVICE *****END OF FILE****/

只看该作者 · 2016-1-22 17:16

生成的.map文件分析
1、//文件生成的模块之间相互引用的关系
Section Cross References

//main.o是main.c的编译生成的目标文件，其中文件中每个函数被编译成一个段（Section）
//下面这句话的意思是：目标文件main.o中段i.GPIO_Configuration引用了gd32f20x_rcc.o
//目标文件中i.RCC_APB2PeriphClock_Enable段的标号RCC_APB2PeriphClock_Enable
main.o(i.GPIO_Configuration) refers to gd32f20x_rcc.o(i.RCC_APB2PeriphClock_Enable) for RCC_APB2PeriphClock_Enable
main.o(i.GPIO_Configuration) refers to gd32f20x_gpio.o(i.GPIO_Init) for GPIO_Init
main.o(i.main) refers to main.o(i.GPIO_Configuration) for GPIO_Configuration
main.o(i.main) refers to systick.o(i.SysTick_Configuration) for SysTick_Configuration
main.o(i.main) refers to gd32f20x_gpio.o(i.GPIO_SetBits) for GPIO_SetBits
main.o(i.main) refers to gd32f20x_gpio.o(i.GPIO_ResetBits) for GPIO_ResetBits
main.o(i.main) refers to systick.o(i.Delay_1ms) for Delay_1ms
gd32f20x_it.o(i.SysTick_Handler) refers to systick.o(i.TimingDelay_Decrement) for TimingDelay_Decrement
systick.o(i.Delay_1ms) refers to systick.o(.data) for TimingDelay

2、//删除镜像没调用到的输入段，这样可以减少生成的可执行文件的大小
Removing Unused input sections from the image.

Removing main.o(.rev16_text), (4 bytes).
Removing main.o(.revsh_text), (4 bytes).
Removing main.o(.data), (4 bytes).
Removing gd32f20x_it.o(.rev16_text), (4 bytes).
Removing gd32f20x_it.o(.revsh_text), (4 bytes).
Removing systick.o(.rev16_text), (4 bytes).
Removing systick.o(.revsh_text), (4 bytes).
Removing system_gd32f20x.o(.rev16_text), (4 bytes).
Removing system_gd32f20x.o(.revsh_text), (4 bytes).
Removing system_gd32f20x.o(i.SystemCoreClockUpdate), (360 bytes)

3、
//镜像中符号表
Image Symbol Table
//局部符号
Local Symbols

Symbol Name                            Value    Ov Type       Size  Object(Section)

../clib/microlib/init/entry.s          0x00000000 Number       0  entry7b.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry8b.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry9a.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry11b.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry10a.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry9b.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry10b.o ABSOLUTE
../clib/microlib/init/entry.s          0x00000000 Number       0  entry11a.o ABSOLUTE

4、
//全局符号
Global Symbols

Symbol Name                            Value    Ov Type       Size  Object(Section)

BuildAttributes$$THM_ISAv4$P$D$K$B$S$PE$A:L22UL41UL21$X:L11$S22US41US21$IEEE1$IW$USESV6$~STKCKD$USESV7$~SHL$OSPACE$EBA8$MICROLIB$REQ8$PRES8$EABIv2 0x00000000 Number       0  anon$$obj.o ABSOLUTE
__ARM_use_no_argv                      0x00000000 Number       0  main.o ABSOLUTE
__cpp_initialize__aeabi_                - Undefined Weak Reference
__cxa_finalize                         - Undefined Weak Reference
__decompress                            - Undefined Weak Reference
_clock_init                            - Undefined Weak Reference
_microlib_exit                         - Undefined Weak Reference
__Vectors_Size                         0x000001a8 Number       0  startup_gd32f20x_cl.o ABSOLUTE
__Vectors                               0x08000000 Data          4  startup_gd32f20x_cl.o(RESET)
__Vectors_End                         0x080001a8 Data          0  startup_gd32f20x_cl.o(RESET)
__main                                  0x080001a9 Thumb Code    0  entry.o(.ARM.Collect$$$$00000000)
_main_stk                               0x080001a9 Thumb Code    0  entry2.o(.ARM.Collect$$$$00000001)

5、//镜像的存储分布
Memory Map of the image

  //程序的入口，Reset_Handler的地址，中断向量表的大小为0x1a8
  Image Entry point : 0x080001a9

  //程序的加载首地址和长度，Size:1688(0x698) = 代码code(1208) + 常数RO Data(456)+ 已初始化的全局变量 RW Data(24)
  Load Region LR_IROM1 (Base: 0x08000000, Size: 0x00000698, Max: 0x00040000, ABSOLUTE)

//ROM执行区首地址和长度，Size:1664(0x680) = 代码code(1208) + 常数RO Data(456)
Execution Region ER_IROM1 (Base: 0x08000000, Size: 0x00000680, Max: 0x00040000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object

0x08000000 0x000001a8 Data RO       5260 RESET             startup_gd32f20x_cl.o       //中断向量表
0x080001a8 0x00000000 Code RO       5265  * .ARM.Collect$$$$00000000  mc_w.l(entry.o)
0x080001a8 0x00000004 Code RO       5268 .ARM.Collect$$$$00000001  mc_w.l(entry2.o)
0x080001ac 0x00000004 Code RO       5271 .ARM.Collect$$$$00000004  mc_w.l(entry5.o)
0x080001b0 0x00000000 Code RO       5273 .ARM.Collect$$$$00000008  mc_w.l(entry7b.o)
0x080001b0 0x00000000 Code RO       5275 .ARM.Collect$$$$0000000A  mc_w.l(entry8b.o)
0x080001b0 0x00000008 Code RO       5276 .ARM.Collect$$$$0000000B  mc_w.l(entry9a.o)
0x080001b8 0x00000000 Code RO       5278 .ARM.Collect$$$$0000000D  mc_w.l(entry10a.o)
0x080001b8 0x00000000 Code RO       5280 .ARM.Collect$$$$0000000F  mc_w.l(entry11a.o)
0x080001b8 0x00000004 Code RO       5269 .ARM.Collect$$$$00002712  mc_w.l(entry2.o)
0x080001bc 0x00000024 Code RO       5261 .text             startup_gd32f20x_cl.o
0x080001e0 0x00000024 Code RO       5282 .text             mc_w.l(init.o)
0x08000204 0x00000004 Code RO       148 i.BusFault_Handler  gd32f20x_it.o
0x08000208 0x00000002 Code RO       149 i.DebugMon_Handler  gd32f20x_it.o
0x0800020a 0x00000002 PAD
0x0800020c 0x00000014 Code RO       238 i.Delay_1ms       systick.o
0x08000220 0x0000003c Code RO          3 i.GPIO_Configuration  main.o
0x0800025c 0x00000112 Code RO       2616 i.GPIO_Init       gd32f20x_gpio.o
0x0800036e 0x00000004 Code RO       2625 i.GPIO_ResetBits gd32f20x_gpio.o
0x08000372 0x00000004 Code RO       2626 i.GPIO_SetBits    gd32f20x_gpio.o
0x08000376 0x00000004 Code RO       150 i.HardFault_Handler  gd32f20x_it.o
0x0800037a 0x00000004 Code RO       151 i.MemManage_Handler  gd32f20x_it.o
0x0800037e 0x00000002 Code RO       152 i.NMI_Handler    gd32f20x_it.o
0x08000380 0x00000028 Code RO       239 i.NVIC_SetPriority  systick.o
0x080003a8 0x00000002 Code RO       153 i.PendSV_Handler gd32f20x_it.o
0x080003aa 0x00000002 PAD
0x080003ac 0x00000020 Code RO       3356 i.RCC_APB2PeriphClock_Enable  gd32f20x_rcc.o
0x080003cc 0x00000002 Code RO       154 i.SVC_Handler    gd32f20x_it.o
0x080003ce 0x00000008 Code RO       281 i.SetSysClock    system_gd32f20x.o
0x080003d6 0x00000002 PAD
0x080003d8 0x000000f8 Code RO       282 i.SetSysClockTo120  system_gd32f20x.o
0x080004d0 0x00000050 Code RO       240 i.SysTick_Configuration  systick.o
0x08000520 0x00000008 Code RO       155 i.SysTick_Handler gd32f20x_it.o
0x08000528 0x00000088 Code RO       284 i.SystemInit       system_gd32f20x.o
0x080005b0 0x00000018 Code RO       241 i.TimingDelay_Decrement  systick.o
0x080005c8 0x00000004 Code RO       156 i.UsageFault_Handler  gd32f20x_it.o
0x080005cc 0x0000000e Code RO       5286 i.__scatterload_copy  mc_w.l(handlers.o)
0x080005da 0x00000002 Code RO       5287 i.__scatterload_null  mc_w.l(handlers.o)
0x080005dc 0x0000000e Code RO       5288 i.__scatterload_zeroinit  mc_w.l(handlers.o)
0x080005ea 0x00000002 PAD
0x080005ec 0x00000074 Code RO          4 i.main             main.o
0x08000660 0x00000020 Data RO       5284 Region$$Table    anon$$obj.o

Execution Region RW_IRAM1 (Base: 0x20000000, Size: 0x00002018, Max: 0x00020000, ABSOLUTE)

Base Addr Size       Type Attr    Idx E Section Name       Object

0x20000000 0x00000004 Data RW       242 .data             systick.o
0x20000004 0x00000014 Data RW       285 .data             system_gd32f20x.o
0x20000018 0x00002000 Zero RW       5258 STACK             startup_gd32f20x_cl.o

6、
//RW Data存放已初始化的全局变量，是Flash的一段空间。在程序启动前会从Flash拷贝到SRAM中
//所以程序占SRAM和Flash的大小都包括了RW Data
Total RO  Size (Code + RO Data)                1664 ( 1.63kB)
Total RW  Size (RW Data + ZI Data)             8216 ( 8.02kB)  （程序占SRAM的大小）
Total ROM Size (Code + RO Data + RW Data)    1688 ( 1.65kB)  （程序占Flash的大小）