匯編跳轉指令

跳轉指令分三類:
一、無條件跳轉: JMP;
二、根據 CX、ECX 寄存器的值跳轉: JCXZ(CX 為 0 則跳轉)、JECXZ(ECX 為 0 則跳轉);
三、根據 EFLAGS 寄存器的標志位跳轉, 這個太多了.

根據標志位跳轉的指令:

---

JE   ;等於則跳轉
JNE  ;不等於則跳轉
JZ   ;為 0 則跳轉

JNZ  ;不為 0 則跳轉
JS   ;為負則跳轉

JNS  ;不為負則跳轉
JC   ;進位則跳轉

JNC  ;不進位則跳轉
JO   ;溢出則跳轉

JNO  ;不溢出則跳轉
JA   ;無符號大於則跳轉

JNA  ;無符號不大於則跳轉

JAE  ;無符號大於等於則跳轉

JNAE ;無符號不大於等於則跳轉
JG   ;有符號大於則跳轉

JNG  ;有符號不大於則跳轉

JGE  ;有符號大於等於則跳轉

JNGE ;有符號不大於等於則跳轉
JB   ;無符號小於則跳轉

JNB  ;無符號不小於則跳轉

JBE  ;無符號小於等於則跳轉

JNBE ;無符號不小於等於則跳轉
JL   ;有符號小於則跳轉

JNL  ;有符號不小於則跳轉

JLE  ;有符號小於等於則跳轉

JNLE ;有符號不小於等於則跳轉
JP   ;奇偶位置位則跳轉

JNP  ;奇偶位清除則跳轉

JPE  ;奇偶位相等則跳轉

JPO  ;奇偶位不等則跳轉
   
   
   
   
           

跳轉相關的標志位:

11	10	9	8	7	6	5	4	3	2	1	0
OF	DF	IF	TF	SF	ZF		AF		PF		CF
溢 出				符 號	零	未 用	輔 助	未 用	奇 偶	未 用	進 位

---

JMP 測試

---

; 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


 ;測試結果應該是:
 ;1
 ;4
 ;以下都應該是這樣.
   
   
   
   
           

JE 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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 測試

---

; 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