判断下列指令正误并说明理由？-ARM汇编 第3章ARM指令系统

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