ARM汇编和Gnu汇编的转换

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

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