subrout.s

来自「一些ARM的源程序」· S 代码 · 共 21 行

#        AREA subrout, CODE, READONLY   ; name this block of code
#        ENTRY                          ; mark first instruction
#                             		   	; to execute
.text
start:
        MOV     r0, #10                 /* Set up parameters */
        MOV     r1, #3
        BL      doadd                   /* Call subroutine */

stop:
        MOV     r0, #0x18               /* angel_SWIreason_ReportException */
        LDR     r1, =0x20026            /* ADP_Stopped_ApplicationExit */
        SWI     0x123456                /* Angel semihosting ARM SWI */

doadd:
        ADD     r0, r0, r1              /* Subroutine code */
        MOV     pc, lr                  /* Return from subroutine. */

.end
#        END                             ; Mark end of file