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
