【ARM】ARM汇编程序设计(一)

00. 目录

文章目录

• 00. 目录
• 01. 第一个汇编程序
• 02. printf函数
• 03. 字符串
• 04. 进制
• 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. 附录

01. 第一个汇编程序

源程序

.section .rodata
.align 2
.LC0:
.string "hello arm"

.section .text
.align 2
.global main
main:
push {lr}

ldr r0, =.LC0
bl puts

mov r0, #0
pop {lr}
bx lr

编译执行

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

# ARM板执行
[root@itcast 1st]# ./test
hello arm
[root@itcast 1st]#

程序改进版本

.section .rodata
.align 2
.LC0:
.string "hello arm"

.section .text
.align 2
.global main
main:
push {lr}

ldr r0, =.LC0
bl puts

mov r0, #0
pop {pc}

编译执行

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

[root@itcast 1st]# ./test
hello arm
[root@itcast 1st]#

02. printf函数

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, =.LC0
mov r1, #123
bl printf

@printf("val = %d %d %d\n", 11, 22, 33);
ldr r0, =.LC1
mov r1, #11
mov r2, #22
mov r3, #33
bl printf

@printf("val = %d %d %d %d\n", 11, 22, 33, 44);
ldr r0, =.LC2
mov r1, #11
mov r2, #22
mov r3, #33
mov r4, #44
push {r4}
bl printf
pop {r4}

mov r0, #0
pop {pc}

执行结果

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

友情提示

当传递参数超过4个时候，需要使用栈传递参数。

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, =.LC0
bl printf

ldr r0, =.LC1
bl printf

ldr r0, =.LC2
bl printf

mov r0, #0
pop {pc}

友情提示

.string 会在字符串后面自动添加\0

.asciz 会在字符串后面自动添加\0

.ascii 不会在字符串后面自动添加\0

04. 进制

程序示例

.section .rodata
.align 2
.LC0:
.string "val = %d\n"

.section .text
.align 2
.global main
main:
push {lr}

ldr r0, =.LC0
mov r1, #10
bl printf

ldr r0, =.LC0
mov r1, #010
bl printf

ldr r0, =.LC0
mov r1, #0x10
bl printf

ldr r0, =.LC0
mov r1, #0b10
bl printf

mov r0, #0
pop {pc}

执行结果

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

友情提示

二进制 0b10

八进制 010

十进制 10

十六进制 0x10

05. mov指令

程序示例一: 立即数

.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, #0x10000008
mov r1, #0xff
bl printf

mov r0, #0
pop {pc}

执行结果:

[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, =.LC0
mov r2, #0x100
mov r1, r2, LSL #4
bl printf

mov r0, #0
pop {pc}

执行结果:

[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, =.LC0
mov r2, #0xff000000
@mov r1, r2, LSR #31
@mov r1, r2, ASR #31
mov r1, r2, ROR #31

bl printf

mov r0, #0
pop {pc}

执行结果:

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

程序示例四：表达式

.section .rodata
.align 2
.LC0:
.string "val = %p\n"

.section .text
.align 2
.global main
main:
push {lr}

ldr r0, =.LC0
mov r1, #(100/4 + 3 * 2 + 1)

bl printf

mov r0, #0
pop {pc}

程序示例五：优化处理

.section .rodata
.align 2
.LC0:
.string "val = %p\n"

.section .text
.align 2
.global main
main:
push {lr}

ldr r0, =.LC0
mov r1, #0xffffffff
bl printf

mov r0, #0
pop {pc}

执行结果:

[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, =.LC0
mvn  r1, #0xffffff00
bl printf

mov r0, #0
pop {pc}

执行结果：

[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, =.LC0
mov r2, #1
mov r3, #2
mov 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 << 2
add r1, r2, r3, LSL #2

bl printf

mov r0, #0
pop {pc}

执行结果:

[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, =.LC0
mov r2, #1
mov r3, #2
mov r1, r2

@r1 = r3 - r2
@sub r1, r3, r2

@r1 =r2 - r3
@sub r1, r2, r3

@r1 = r3 - 1
sub r1, r3, #1

bl printf

mov r0, #0
pop {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, =.LC0
mov r2, #1
mov r3, #2
mov r1, r2

@r1 = r3 - r2
@rsb r1, r2, r3

@r1 = 10 - r2
rsb r1, r2, #10

bl printf

mov r0, #0
pop {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, =.LC0

mov r2, #0xff
mov r3, #0x3

@r1 = r2 & r3
and r1, r2, r3

bl printf

mov r0, #0
pop {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, =.LC0

mov r2, #0xff
mov r3, #0x3

@r1 = r2 & ~r3
bic r1, r2, r3
bl printf

mov r0, #0
pop {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, =.LC0

mov r2, #0xf0
mov r3, #0x3

@r1 = r2 | r3
orr r1, r2, r3
bl printf

mov r0, #0
pop {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, =.LC0

mov r2, #0xff
mov r3, #0x3

@r1 = r2 ^ r3
eor r1, r2, r3
bl printf

mov r0, #0
pop {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, =.LC0

mov r2, #3
mov r3, #8
mov r1, #1

@r1 = r2 * r3
@mul r1, r2, r3

@r1 = r1 * r2
mul r1, r1, r2

bl printf

mov r0, #0
pop {pc}

15. 附录