00. 目錄

文章目錄

• • 00. 目錄
  • 01. 第一個(gè)匯編程序
  • 02. printf函數(shù)
  • 03. 字符串
  • 04. 進(jìn)制
  • 05. mov指令
  • 06. mvn指令
  • 07. add指令
  • 08. sub指令
  • 09. rsb指令
  • 10. and指令
  • 11. bic指令
  • 12. orr指令
  • 13. eor指令
  • 14. mul指令
  • 15. 附錄

01. 第一個(gè)匯編程序

源程序

.section .rodata.align 2 .LC0:.string "hello arm".section .text.align 2.global main main:push {lr}ldr r0, =.LC0bl putsmov r0, #0pop {lr}bx lr

編譯執(zhí)行

# PC端 [root@itcast 1st]# arm-linux-gcc test.s -o test [root@itcast 1st]# # ARM板執(zhí)行 [root@itcast 1st]# ./test hello arm [root@itcast 1st]#

程序改進(jìn)版本

.section .rodata.align 2 .LC0:.string "hello arm".section .text.align 2.global main main:push {lr}ldr r0, =.LC0bl putsmov r0, #0pop {pc}

編譯執(zhí)行

[root@itcast 1st]# arm-linux-gcc test.s -o test [root@itcast 1st]# [root@itcast 1st]# ./test hello arm [root@itcast 1st]#

02. printf函數(shù)

程序如下:

.section .rodata.align 2 .LC0:.string "val = %d\n".LC1:.string "val = %d %d %d\n".LC2:.string "val = %d %d %d %d\n".section .text.align 2.global main main:push {lr}@printf("val = %d\n", 123);ldr r0, =.LC0mov r1, #123bl printf@printf("val = %d %d %d\n", 11, 22, 33);ldr r0, =.LC1mov r1, #11mov r2, #22mov r3, #33bl printf@printf("val = %d %d %d %d\n", 11, 22, 33, 44);ldr r0, =.LC2mov r1, #11mov r2, #22mov r3, #33mov r4, #44push {r4}bl printfpop {r4}mov r0, #0pop {pc}

執(zhí)行結(jié)果

[root@itcast 1st]# ./a.out val = 123 val = 11 22 33 val = 11 22 33 44 [root@itcast 1st]#

友情提示

當(dāng)傳遞參數(shù)超過4個(gè)時(shí)候，需要使用棧傳遞參數(shù)。

03. 字符串

程序示例：

.section .rodata.align 2 .LC0:.string "hello arm\n".LC1:.ascii "hello arm\n\0".LC2:.asciz "hello arm\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0bl printfldr r0, =.LC1bl printfldr r0, =.LC2bl printfmov r0, #0pop {pc}

友情提示

.string 會(huì)在字符串后面自動(dòng)添加\0

.asciz 會(huì)在字符串后面自動(dòng)添加\0

.ascii 不會(huì)在字符串后面自動(dòng)添加\0

04. 進(jìn)制

程序示例

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r1, #10bl printfldr r0, =.LC0mov r1, #010bl printfldr r0, =.LC0mov r1, #0x10bl printfldr r0, =.LC0mov r1, #0b10bl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果

[root@itcast 1st]# ./a.out val = 10 val = 8 val = 16 val = 2 [root@itcast 1st]#

友情提示

二進(jìn)制 0b10

八進(jìn)制 010

十進(jìn)制 10

十六進(jìn)制 0x10

05. mov指令

程序示例一: 立即數(shù)

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0@@mov r1, #0x123@mov r1, #0x7f8@mov r1, #0xc80000003@mov r1, #0xc80000007@mov r1, #0x10000008mov r1, #0xffbl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果:

[root@itcast 1st]# ./a.out val = 255 [root@itcast 1st]#

程序示例二：移位操作

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0x100mov r1, r2, LSL #4bl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果:

[root@itcast 1st]# ./a.out val = 0x1000 [root@itcast 1st]#

程序示例三: 移位操作

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0xff000000@mov r1, r2, LSR #31@mov r1, r2, ASR #31mov r1, r2, ROR #31bl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果:

[root@itcast 1st]# ./a.out val = 0xfe000001 [root@itcast 1st]#

程序示例四：表達(dá)式

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r1, #(100/4 + 3 * 2 + 1)bl printfmov r0, #0pop {pc}

程序示例五：優(yōu)化處理

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r1, #0xffffffffbl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果:

[root@itcast 1st]# ./a.out val = 0xffffffff [root@itcast 1st]#

06. mvn指令

程序示例

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mvn r1, #0xffffff00bl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果：

[root@itcast 1st]# ./a.out val = 0xff [root@itcast 1st]#

07. add指令

程序示例：

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #1mov r3, #2mov r1, r2@r1 = r2 + r3@add r1, r2, r3@r1 = r2 + 8@add r1, r2, #8@r1 = r1 + 1@add r1, r1, #1@r1 = r1 + 1@add r1, #1@r1 = r2 + r3 << 2add r1, r2, r3, LSL #2bl printfmov r0, #0pop {pc}

執(zhí)行結(jié)果:

[root@itcast 1st]# ./a.out val = 9 [root@itcast 1st]#

08. sub指令

程序示例:

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #1mov r3, #2mov r1, r2@r1 = r3 - r2@sub r1, r3, r2@r1 =r2 - r3@sub r1, r2, r3@r1 = r3 - 1sub r1, r3, #1bl printfmov r0, #0pop {pc}

09. rsb指令

程序示例

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #1mov r3, #2mov r1, r2@r1 = r3 - r2@rsb r1, r2, r3@r1 = 10 - r2rsb r1, r2, #10bl printfmov r0, #0pop {pc}

10. and指令

程序示例:

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0xffmov r3, #0x3@r1 = r2 & r3and r1, r2, r3bl printfmov r0, #0pop {pc}

11. bic指令

程序示例

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0xffmov r3, #0x3@r1 = r2 & ~r3bic r1, r2, r3bl printfmov r0, #0pop {pc}

12. orr指令

程序示例:

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0xf0mov r3, #0x3@r1 = r2 | r3orr r1, r2, r3bl printfmov r0, #0pop {pc}

13. eor指令

程序示例

.section .rodata.align 2 .LC0:.string "val = %p\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #0xffmov r3, #0x3@r1 = r2 ^ r3eor r1, r2, r3bl printfmov r0, #0pop {pc}

14. mul指令

程序示例

.section .rodata.align 2 .LC0:.string "val = %d\n".section .text.align 2.global main main:push {lr}ldr r0, =.LC0mov r2, #3mov r3, #8mov r1, #1@r1 = r2 * r3@mul r1, r2, r3@r1 = r1 * r2mul r1, r1, r2bl printfmov r0, #0pop {pc}

15. 附錄

總結(jié)

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