thumbcode.s

基于S3C2410的Thumb指令使用实验用例 非常实用

   area start,code,readonly
   entry
   code32
   export START
START
code32             			            ;/*  Subsequent instructions are ARM */
header
        ADR     r0, Tstart + 1           ;/*  Processor starts in ARM state, */
        BX      r0                     ;/*  so small ARM code header used */
                                    	;/*  to call Thumb main program. */
        NOP    
        code16
Tstart
        MOV     r0, #10                 ;/*  Set up parameters */
        MOV     r1, #3
        BL      doadd                   ;/*  Call subroutine */
        
stop
                B stop

doadd
        ADD     r0, r0, r1              ;/*  Subroutine code */
        bx      lr                       ;/*  Return from subroutine. */

  end                                      ; /*  Mark end of file */