thumbsub.s

来自「运行工具为ADS,为ARM体系结构的汇编源泉代码」· S 代码 · 共 23 行

        AREA ThumbSub, CODE, READONLY   ; Name this block of code
        ENTRY                           ; Mark first instruction to execute
        CODE32                          ; Subsequent instructions are ARM 
header
        ADR     r0, start + 1           ; Processor starts in ARM state, 
        BX      r0                      ; so small ARM code header used 
                                        ; to call Thumb main program.

        CODE16                          ; Subsequent instructions are Thumb. 
start
        MOV     r0, #10                 ; Set up parameters
        MOV     r1, #3
        BL      doadd                   ; Call subroutine
end_0   B       end_0
        

doadd
        ADD     r0, r0, r1              ; Subroutine code
        MOV     pc, lr                  ; Return from subroutine.

        END                             ; Mark end of file