ARM汇编和Gnu汇编的转换

将 ARM ADS 下的汇编码移植到 GCC for ARM 编译器时，有如下规则： 
1, 注释行以 "@" 或 "/* ... */" 代替 ";" 

2, GET 或 INCLUDE => .INCLUDE
如： get option.a => .include "option.a" 

3, EQU => .equ
TCLK2 EQU PB25 => .equ TCLK2, PB25
SETA ==> .equ
SETL ==> .equ 
BUSWIDTH SETA 16 => .equ BUSWIDTH, 16 

4, EXPORT => .global
IMPORT => .extern
GBLL => .global
GBLA => .global 

5, DCD => .long 

6, IF :DEF: => .IFDEF
ELSE => .ELSE
ENDIF => .ENDIF
:OR: => |
:SHL: => << 

7, END =>.end
NOTE: 在被 include 的头文件中，如 "option.a" 中，不再需要 .end ，否则会导致主汇编程序结束。 

8, 符号定义加 " ： " 号 
Entry => Entry:
AREA Word, CODE, READONLY ==> .text
AREA Block, DATA, READWRITE ==> .data
CODE32 ==> .arm
CODE16 ==> .thumb 

9, MACRO ==> .macro
MEND ==> .endm 

Reference:
http://blog.21ic.com/user1/3858/archives/2007/43113.html