AT&T汇编 基本数学功能

加法：

.section .data
val:

.quad 3481219651

val1:

.quad 6678934517

output:

.asciz "The res is %qd\n"

.section .text
.globl _start

_start:

movl val, %eax

movl val + 4, %ebx

movl val1, %ecx

movl val1 + 4, %edx

addl %eax, %ecx

adcl %ebx, %edx

pushl %edx

pushl %ecx

pushl $output

call printf

movl $1, %eax

movl $0, %ebx

int $0x80

减法：

.section .data
val:

.quad 3481219651

val1:

.quad 6678934517

output:

.asciz "The res is %qd\n"

.section .text
.globl _start
_start:

movl val1, %eax

movl val1 + 4, %ebx

movl val, %ecx

movl val + 4, %edx

subl %eax, %ecx

sbbl %ebx, %edx

pushl %edx

pushl %ecx

pushl $output

call printf

movl $1, %eax

movl $0, %ebx

int $0x80

乘法：

1.mul 指令只能用于无符号整数：

.section .data
val:

.int 316722

val1:

.int 129907

result:

.quad 0

output:

.asciz "The res is %qd\n"

.section .text
.globl _start
_start:

movl val, %eax

mull val1

movl %eax, result

movl %edx, result + 4

pushl result + 4

pushl result

pushl $output

call printf

movl $1, %eax

movl $0, %ebx

int $0x80

2.imul 可用于带符号和无符号整数：

imul des                       ( AL，AX，EAX 中为隐含操作数，乘积结果被存放在 AX寄存器 or 

DX : AX 寄存器对 or EDX : EAX 寄存器对中 )

imul src， des              ( src 可以是 16 or 32 位的寄存器 or 内存中， des 必须是 16 or 32 位的通用寄存器 )

imul multi， src， des ( multi 与 src 的快速乘法的结果存放在 des 中 )

.section .data
val:

.int 10

val1:

.int 12

val2:

.int 100

output:

.asciz "The res is %qd\n"

.section .text
.globl _start
_start:

movl val, %eax

movl val1, %ebx

imull %eax, %ebx

movl val2, %edx

imull $4, %edx, %ecx

movl $1, %eax

movl $0, %ebx

int $0x80

除法：

1.无符号除法

被除数被除数长度商余数AX16位ALAHDX : AX32位AXDXEDX : EAX64位EAXEDX

div divisor

.section .data
dividend:

.quad 4537124

divisor:

.int 35

quotient:

.int 0

remainder:

.int 0

output:

.asciz "quotient is %d, remainder is %d\n"

.section .text
.globl _start
_start:

movl dividend, %eax

movl dividend + 4, %edx

divl divisor

movl %eax, quotient

movl %edx, remainder

pushl remainder

pushl quotient

pushl $output

call printf

addl $12, %esp

movl $1, %eax

movl $0, %ebx

int $0x80

2.带符号除法 idiv divisor 类似