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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

被除数被除数长度余数
AX16位ALAH
DX : AX32位AXDX
EDX : 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


AT&T汇编 基本数学功能