?? test4.s
字號:
X EQU 9
n EQU 8
;--------------------------------------
AREA Example4,CODE,READONLY
ENTRY
CODE32
;--------------------------------------
START LDR SP,=0x40003f00
LDR R0,=X
LDR R1,=n
LDR R2,=0X33333333
LDR R3,=0X44444444
LDR R4,=0X55555555
LDR R5,=0X66666666
LDR R12,=0X12121212
BL POW
;--------------------------------------
HALT B HALT
;--------------------------------------
POW STMFD SP!,{R1-R12,LR}
MOVS R2,R1
MOVEQ R0,#1
BEQ POW_END
CMP R2,#1
BEQ POW_END
MOV R1,R0
SUB R2,R2,#1
POW_L1 BL DO_MUL
SUBS R2,R2,#1
BNE POW_L1
POW_END LDMFD SP!,{R1-R12,PC}
;--------------------------------------
DO_MUL MUL R0,R1,R0
MOV PC,LR
;--------------------------------------
END
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