STM32启动代码解析入门

;******************** (C) COPYRIGHT 2008 STMicroelectronics ********************
;* File Name          : stm32f10x_vector.s
;* Author             : MCD Application Team
;* Version            : V2.0.1
;* Date               : 06/13/2008
;* Description        : STM32F10x vector table for RVMDK 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 external SRAM mounted on STM3210E-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 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.
;*******************************************************************************

; If you need to use external SRAM mounted on STM3210E-EVAL board as data memory,
; change the following define value to '1' (or choose ENABLE in Configuration Wizard window)
;;   <o>  External SRAM Configuration  <0=> DISABLE <1=> ENABLE 
DATA_IN_ExtSRAM  EQU     0

; 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    ;定义栈大小

                 AREA    STACK, NOINIT, READWRITE, ALIGN=3 ;定义栈数据段，NOINIT（指示数据节未初始化，或初始化为零。 它只包含空间保留指令）
  ;可读写，8字节对齐    ALIGN=N 是指 2的N次方个字节对齐，与单独的ALIGN n  为n字节对齐不同
Stack_Mem        SPACE   Stack_Size   ;分配一片连续的Stack_Size个字节的存储区域并初始化为 0 

__initial_sp ;汇编代码地址编号
; If you need to use external SRAM mounted on STM3210E-EVAL board as data memory
; and internal SRAM for Stack, uncomment the following line and comment the line above
;__initial_sp    EQU 0x20000000 + Stack_Size ; "Use MicroLIB" must be checked in
                                             ; the Project->Options->Target window

; Amount of memory (in bytes) allocated for Heap
; Tailor this value to your application needs
;; <h> Heap Configuration
;;   <o>  Heap Size (in Bytes) <0x0-0xFFFFFFFF:8>
;; </h>

Heap_Size        EQU     0x00000400    ;堆大小

                 AREA    HEAP, NOINIT, READWRITE, ALIGN=3 ;同上
__heap_base
Heap_Mem         SPACE   Heap_Size