學 Win32 匯編[28]---跳轉(zhuǎn)指令

herowuking 2015-09-26

展開全文

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

根據(jù)標志位跳轉(zhuǎn)的指令:


JE   ;等于則跳轉(zhuǎn)
JNE  ;不等于則跳轉(zhuǎn)

JZ   ;為 0 則跳轉(zhuǎn)
JNZ  ;不為 0 則跳轉(zhuǎn)

JS   ;為負則跳轉(zhuǎn)
JNS  ;不為負則跳轉(zhuǎn)

JC   ;進位則跳轉(zhuǎn)
JNC  ;不進位則跳轉(zhuǎn)

JO   ;溢出則跳轉(zhuǎn)
JNO  ;不溢出則跳轉(zhuǎn)

JA   ;無符號大于則跳轉(zhuǎn)
JNA  ;無符號不大于則跳轉(zhuǎn)
JAE  ;無符號大于等于則跳轉(zhuǎn)
JNAE ;無符號不大于等于則跳轉(zhuǎn)

JG   ;有符號大于則跳轉(zhuǎn)
JNG  ;有符號不大于則跳轉(zhuǎn)
JGE  ;有符號大于等于則跳轉(zhuǎn)
JNGE ;有符號不大于等于則跳轉(zhuǎn)

JB   ;無符號小于則跳轉(zhuǎn)
JNB  ;無符號不小于則跳轉(zhuǎn)
JBE  ;無符號小于等于則跳轉(zhuǎn)
JNBE ;無符號不小于等于則跳轉(zhuǎn)

JL   ;有符號小于則跳轉(zhuǎn)
JNL  ;有符號不小于則跳轉(zhuǎn)
JLE  ;有符號小于等于則跳轉(zhuǎn)
JNLE ;有符號不小于等于則跳轉(zhuǎn)

JP   ;奇偶位置位則跳轉(zhuǎn)
JNP  ;奇偶位清除則跳轉(zhuǎn)
JPE  ;奇偶位相等則跳轉(zhuǎn)
JPO  ;奇偶位不等則跳轉(zhuǎn)

跳轉(zhuǎn)相關(guān)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(jié)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