汇编跳转指令

转自：https://blog.csdn.net/weixin_32589873/article/details/78207020

跳转指令分三类:
一、无条件跳转: JMP;
二、根据 CX、ECX 寄存器的值跳转: JCXZ(CX 为 0 则跳转)、JECXZ(ECX 为 0 则跳转);
三、根据 EFLAGS 寄存器的标志位跳转, 这个太多了.

根据标志位跳转的指令:


JE   ;等于则跳转
JNE  ;不等于则跳转
JZ   ;为 0 则跳转

JNZ  ;不为 0 则跳转
JS   ;为负则跳转

JNS  ;不为负则跳转
JC   ;进位则跳转

JNC  ;不进位则跳转
JO   ;溢出则跳转

JNO  ;不溢出则跳转
JA   ;无符号大于则跳转

JNA  ;无符号不大于则跳转

JAE  ;无符号大于等于则跳转

JNAE ;无符号不大于等于则跳转
JG   ;有符号大于则跳转

JNG  ;有符号不大于则跳转

JGE  ;有符号大于等于则跳转

JNGE ;有符号不大于等于则跳转
JB   ;无符号小于则跳转

JNB  ;无符号不小于则跳转

JBE  ;无符号小于等于则跳转

JNBE ;无符号不小于等于则跳转
JL   ;有符号小于则跳转

JNL  ;有符号不小于则跳转

JLE  ;有符号小于等于则跳转

JNLE ;有符号不小于等于则跳转
JP   ;奇偶位置位则跳转

JNP  ;奇偶位清除则跳转

JPE  ;奇偶位相等则跳转

JPO  ;奇偶位不等则跳转

跳转相关的标志位:

11	10	9	8	7	6	5	4	3	2	1	0
OF	DF	IF	TF	SF	ZF		AF		PF		CF
溢出				符号	零	未用	辅助	未用	奇偶	未用	进位

JMP 测试

; Test28_1.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    jmp @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main



;测试结果应该是:

;1

;4

;以下都应该是这样.

JE 测试

; Test28_2.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov eax, 123

    cmp eax, 123

    je @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JZ 测试

; Test28_3.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    xor eax, eax

    jz @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JS 测试

; Test28_4.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    xor eax, eax

    dec eax

    js @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JC 测试

; Test28_5.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov al, 0FFh

    add al, 1

    jc @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JO 测试

; Test28_6.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov al, -128

    sub al, 1

    jo @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JA 测试

; Test28_7.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov eax, 22

    cmp eax, 11

    ja @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JG 测试

; Test28_8.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov eax, 1

    cmp eax, -1

    jg @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JP 测试

; Test28_9.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    mov al, 00001110b

    inc al

    jp @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main

JECXZ 测试

; Test28_10.asm;
.386
.model flat, stdcall
include    windows.inc

include    kernel32.inc

include    masm32.inc

include    debug.inc

includelib kernel32.lib

includelib masm32.lib

includelib debug.lib
.code

main proc

    PrintText '1'

    xor ecx, ecx

    jecxz @F

    PrintText '2'

    PrintText '3'

@@: PrintText '4'

    ret

main endp

end main