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