学 Win32 汇编[28]

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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:
11109876543210OFDFIFTFSFZF 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, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    jmp @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend 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, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov eax, 123    cmp eax, 123    je @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JZ 测试

; Test28_3.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    xor eax, eax    jz @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JS 测试

; Test28_4.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    xor eax, eax    dec eax    js @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JC 测试

; Test28_5.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov al, 0FFh    add al, 1    jc @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JO 测试

; Test28_6.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov al, -128    sub al, 1    jo @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JA 测试

; Test28_7.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov eax, 22    cmp eax, 11    ja @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JG 测试

; Test28_8.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov eax, 1    cmp eax, -1    jg @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JP 测试

; Test28_9.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    mov al, 00001110b    inc al    jp @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

JECXZ 测试

; Test28_10.asm;.386.model flat, stdcallinclude    windows.incinclude    kernel32.incinclude    masm32.incinclude    debug.incincludelib kernel32.libincludelib masm32.libincludelib debug.lib.codemain proc    PrintText '1'    xor ecx, ecx    jecxz @F    PrintText '2'    PrintText '3'@@: PrintText '4'    retmain endpend main

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