8.判断下列指令正误,并说明理由?
(1)LDR R3,[R4]! (2)ADD R6,R5,#4!
(3)LDMIA R6,{R3-R7}! (4)LDMFD R13!,{R2,R4}
(5)ADD R1,R2,#0x104 (6)ADD R1,R2,#0x101
(7)MOV R0,R0 (8)MVN R7,#0x2F100
(9)MVN R0,R3,#2_01110000 (10)SBC R15,R6,LSR R5
(11)AND R5,[R6],R7 (12)MRS R15,CPSR
(13)MSR CPSR,#0x001 (14)MUL R3,R3,R6
(15)MUL R4,R6,#0x80 (16)STRB SP![R0,R4]
(17)LDRB R1,[R6,R4],R6 (18)STRB R0,[R15,#0x04]!
(19)LDRB PC,[R5] (20)LDRSB R5,[R4,#0x101]
(21)STRSH R6,[R5]
9.下列指令在什么条件下被执行
SUBMI R3,R3,#0x08
ADDNE R0,R0,R4
1