ARM Macro Assembler    Page 1 


    1 00000000         ;/****************************************Copyright (c)*
                       *************************************************
    2 00000000         ;**                               Guangzou ZLG-MCU Devel
                       opment Co.,LTD.
    3 00000000         ;**                                      graduate school
                       
    4 00000000         ;**                                 http://www.zlgmcu.co
                       m
    5 00000000         ;**
    6 00000000         ;**--------------File Info------------------------------
                       -------------------------------------------------
    7 00000000         ;** File Name: IRQ.s
    8 00000000         ;** Last modified Date:  2004-06-14
    9 00000000         ;** Last Version: 1.1
   10 00000000         ;** Descriptions: The irq handle that what allow the int
                       errupt nesting. 
   11 00000000         ;**
   12 00000000         ;**-----------------------------------------------------
                       -------------------------------------------------
   13 00000000         ;** Created By: Chenmingji
   14 00000000         ;** Created date:   2004-09-17
   15 00000000         ;** Version: 1.0
   16 00000000         ;** Descriptions: First version
   17 00000000         ;**
   18 00000000         ;**-----------------------------------------------------
                       -------------------------------------------------
   19 00000000         ;** Modified by:
   20 00000000         ;** Modified date:
   21 00000000         ;** Version:
   22 00000000         ;** Descriptions:
   23 00000000         ;**
   24 00000000         ;*******************************************************
                       *************************************************/
   25 00000000         
   26 00000000         
   27 00000000 00000080 
                       NoInt   EQU              0x80
   28 00000000         
   29 00000000 00000010 
                       USR32Mode
                               EQU              0x10
   30 00000000 00000013 
                       SVC32Mode
                               EQU              0x13
   31 00000000 0000001F 
                       SYS32Mode
                               EQU              0x1f
   32 00000000 00000012 
                       IRQ32Mode
                               EQU              0x12
   33 00000000 00000011 
                       FIQ32Mode
                               EQU              0x11
   34 00000000         
   35 00000000                 CODE32
   36 00000000                 PRESERVE8
   37 00000000                 AREA             IRQ, CODE, READONLY
   38 00000000         
   39 00000000                 MACRO



ARM Macro Assembler    Page 2 


   40 00000000         $IRQ_Label
                               HANDLER          $IRQ_Exception_Function
   41 00000000         
   42 00000000                 EXPORT           $IRQ_Label  ; The label for exp
                                                            orts 輸出的標號
   43 00000000                 IMPORT           $IRQ_Exception_Function ; The i
                                                            mported labels 引用
                                                            的外部標號
   44 00000000         
   45 00000000         $IRQ_Label
   46 00000000                 SUB              LR, LR, #4  ; Calculate the ret
                                                            urning address 計算
                                                            返回地址
   47 00000000                 STMFD            SP!, {R0-R3, R12, LR} ; Protect
                                                            s the task environm
                                                            ents 保存任務環境
   48 00000000                 MRS              R3, SPSR    ; Protects the stat
                                                            us variable 保存狀