00. 目錄

文章目錄

• • 00. 目錄
  • 01. 循環結構-死循環
  • 02. 循環結構-累加和
  • 03. 循環結構-循環輸出
  • 04. 循環結構-循環輸出
  • 05. 隨機數
  • 06. 綜合應用一
  • 07. 綜合應用二
  • 08. 綜合應用三
  • 09. 附錄

01. 循環結構-死循環

第一種方式：死循環

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}loop:b loopmov r0, #0pop {pc}

第二種方式：死循環

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}b .mov r0, #0pop {pc}

第三種方式：死循環

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}sub pc, pc, #8mov r0, #0pop {pc}

02. 循環結構-累加和

輸出1 + 2 + 3 + … + 10的和:

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r1, #0loop:add r1, r1, #1cmp r1, #10blt loopldr r0, =.LC0bl printfmov r0, #0pop {pc}

03. 循環結構-循環輸出

方式一：輸出1到10之間的數據

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r4, #1loop:ldr r0, =.LC0mov r1, r4bl printfadd r4, r4, #1cmp r4, #10ble loopmov r0, #0pop {pc}

方式二：輸出1到10之間的數據

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r1, #1loop:ldr r0, =.LC0push {r1}bl printfpop {r1}add r1, r1, #1cmp r1, #10ble loopmov r0, #0pop {pc}

04. 循環結構-循環輸出

方式一：輸出1到100之內的所有奇數

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r4, #1loop:mov r1, r4ldr r0, =.LC0bl printfadd r4, r4, #2cmp r4, #100ble loopmov r0, #0pop {pc}

方式二：輸出1到100之內的所有奇數

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r4, #1loop:mov r1, r4ldr r0, =.LC0ands r2, r4, #1cmp r2, #0blne printfadd r4, r4, #2cmp r4, #100ble loopmov r0, #0pop {pc}

方式三：輸出1到100之內的所有奇數

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}mov r4, #1loop:mov r1, r4ldr r0, =.LC0@ands r2, r4, #1@cmp r2, #0tst r4, #1blne printfadd r4, r4, #2@cmp r4, #100subs r1, r4, #100ble loopmov r0, #0pop {pc}

05. 隨機數

產生100個隨機數,輸出其中的奇數

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}bl getpidbl srandommov r4, #1loop:bl randommov r1, r0tst r1, #1ldr r0, =.LC0blne printfadd r4, r4, #1cmp r4, #100ble loopmov r0, #0pop {pc}

產生100個0-255間的隨機數,輸出其中的奇數

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}bl getpidbl srandommov r4, #1loop:bl randommov r1, r0and r1, #0xfftst r1, #1ldr r0, =.LC0blne printfadd r4, r4, #1cmp r4, #100ble loopmov r0, #0pop {pc}

06. 綜合應用一

輸出九九乘法表

.section .rodata.align 2 .LC0:.string "%2d*%2d=%2d " .LC1:.string "\n".section .text.align 2.global main main:push {lr}mov r4, #1 loop:mov r5, #1 loop2:ldr r0, =.LC0mov r1, r5mov r2, r4mul r3, r4, r5bl printfadd r5, r5, #1cmp r5, r4ble loop2ldr r0, =.LC1bl printfadd r4, r4, #1cmp r4, #9ble loopmov r0, #0pop {pc}

07. 綜合應用二

輸出棱形

.section .rodata.align 2 .LC0:.string " ".LC1:.string "*".LC2:.string "\n".section .text.align 2.global main main:push {lr}mov r4, #0 loop:cmp r4, #10bge out1mov r5, #0loop1:rsb r6, r4, #9cmp r5, r6bge out2ldr r0, =.LC0bl printfadd r5, r5, #1cmp r5, r6blt loop1out2:mov r5, #0loop2:mov r7, #2mul r6, r4, r7add r6, r6, #1cmp r5, r6bgt out3ldr r0, =.LC1bl printfadd r5, r5, #1cmp r5, r6blt loop2out3:ldr r0, =.LC2bl printfadd r4, r4, #1cmp r4, #10blt loopout1:@for (i = 0; i < 9; i++)mov r4, #0 loop3:cmp r4, #9bge out4mov r5, #0loop4:cmp r5, r4bgt out5ldr r0, =.LC0bl printfadd r5, r5, #1cmp r5, r5ble loop4out5:mov r5, #0loop5:rsb r7, r4, #9mov r8, #2mul r6, r7, r8sub r6, r6, #1cmp r5, r6bge out6ldr r0, =.LC1bl printfadd r5, r5, #1cmp r5, r6blt loop5out6:ldr r0, =.LC2bl printfadd r4, r4, #1cmp r4, #9blt loop3out4:mov r0, #0pop {pc}

執行結果

[root@itcast 2nd]# ./a.out ********************************************************************************* **************************************************************************************************** [root@itcast 2nd]#

08. 綜合應用三

輸出棱形

.section .rodata.align 2 .LC0:.string " ".LC1:.string "*".LC2:.string "\n".section .text.align 2.global main main:push {lr}mov r4, #0 2:cmp r4, #10bge 2fmov r5, #01:rsb r6, r4, #9cmp r5, r6bge 1f ldr r0, =.LC0bl printfadd r5, r5, #1cmp r5, r6blt 1b1:mov r5, #01:mov r7, #2mul r6, r4, r7add r6, r6, #1cmp r5, r6bgt 1f ldr r0, =.LC1bl printfadd r5, r5, #1cmp r5, r6blt 1b 1:ldr r0, =.LC2bl printfadd r4, r4, #1cmp r4, #10blt 2b 2:@for (i = 0; i < 9; i++)mov r4, #0 2:cmp r4, #9bge 2fmov r5, #01:cmp r5, r4bgt 1f ldr r0, =.LC0bl printfadd r5, r5, #1cmp r5, r5ble 1b 1:mov r5, #01:rsb r7, r4, #9mov r8, #2mul r6, r7, r8sub r6, r6, #1cmp r5, r6bge 1fldr r0, =.LC1bl printfadd r5, r5, #1cmp r5, r6blt 1b1:ldr r0, =.LC2bl printfadd r4, r4, #1cmp r4, #9blt 2b2:mov r0, #0pop {pc}

執行結果

[root@itcast 2nd]# ./a.out ********************************************************************************* **************************************************************************************************** [root@itcast 2nd]#

09. 附錄

總結

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