將ARM ADS下的匯編碼移植到GCC for ARM編譯器時，有如下規則：
1,注釋行以"@"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的頭文件中，如"option.a"中，不再需要.end，否則會導致主匯編程序結束。

8,符號定義加"："號
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