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📁 加密与解密,软件加密保护技术与解决方案,看雪文档!
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<title>Crack Tutorial</title>
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<p><a href="../Catalog.htm">目录</a>＞＞第2章</p>
<p align="center" class="shadow1Copy"><b class="p3">第2章 基础知识</b><span class="p9">　</span></p>
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  <tr> 
    <td class="shadow1"> 
      <div align="center"><span class="p9">第一节 <a href="Chap2-1.htm"><font color="#FFFFFF">软件保护</font></a><font color="#FFFFFF"></font></span></div>
    </td>
    <td class="shadow1"> 
      <div align="center"><span class="p9">第二节 <a href="Chap2-2.htm"><font color="#FFFFFF">汇编语言</font></a></span></div>
    </td>
    <td class="shadow1"> 
      <div align="center"><span class="p9">第三节 <a href="Chap2-3.htm"><font color="#FFFFFF">汇编跳转</font></a></span></div>
    </td>
    <td class="shadow1"> 
      <div align="center"><span class="p9">第四节 <a href="Chap2-4.htm"><font color="#FFFFFF">浮点指令</font></a></span></div>
    </td>
    <td class="shadow1"> 
      <div align="center"><span class="p9">第五节 <a href="Chap2-5.htm"><font color="#FFFFFF">分析技术</font></a></span></div>
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<blockquote> 
  <p align="center"><b>第三节 8088 汇编跳转</b></p>
</blockquote>
<p align="left"><span class="p9"><font color="#0000FF"><font color="#000000"><b>一、状态寄存器</b></font></font></span></p>
<p align="left" class="p9"><span class="p9">PSW（Program Flag)程序状态字寄存器，是一个16位寄存器，由条件码标志（flag）和控制标志构成，如下所示：</span></p>
<table width="80%" cellspacing="0" cellpadding="0" align="center">
  <tr class="p9"> 
    <td width="6%"> 
      <div align="center">15</div>
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    <td width="6%"> 
      <div align="center">14</div>
    </td>
    <td width="6%"> 
      <div align="center">13</div>
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    <td width="7%"> 
      <div align="center">12</div>
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    <td width="6%"> 
      <div align="center">11</div>
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    <td width="6%"> 
      <div align="center">10</div>
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    <td width="6%"> 
      <div align="center">9</div>
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    <td width="6%"> 
      <div align="center">8</div>
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    <td width="6%"> 
      <div align="center">7</div>
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    <td width="6%"> 
      <div align="center">6</div>
    </td>
    <td width="6%"> 
      <div align="center">5</div>
    </td>
    <td width="7%"> 
      <div align="center">4</div>
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    <td width="5%"> 
      <div align="center">3</div>
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    <td width="7%"> 
      <div align="center">2</div>
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    <td width="6%"> 
      <div align="center">1</div>
    </td>
    <td width="8%"> 
      <div align="center">0</div>
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<table width="80%" cellspacing="0" cellpadding="0" align="center" bgcolor="#FFFFDF" bordercolorlight="#666666" bordercolordark="#FFFFDF" bordercolor="#000000" border="1">
  <tr class="p9"> 
    <td width="6%"> 
      <div align="center">　</div>
    </td>
    <td width="6%"> 
      <div align="center">　</div>
    </td>
    <td width="6%"> 
      <div align="center">　</div>
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    <td width="7%"> 
      <div align="center">　</div>
    </td>
    <td width="6%"> 
      <div align="center">OF</div>
    </td>
    <td width="6%"> 
      <div align="center">DF</div>
    </td>
    <td width="6%"> 
      <div align="center">IF</div>
    </td>
    <td width="6%"> 
      <div align="center">TF</div>
    </td>
    <td width="6%"> 
      <div align="center">SF</div>
    </td>
    <td width="6%"> 
      <div align="center">ZF</div>
    </td>
    <td width="6%"> 
      <div align="center">　</div>
    </td>
    <td width="7%"> 
      <div align="center">AF</div>
    </td>
    <td width="5%"> 
      <div align="center">　</div>
    </td>
    <td width="7%"> 
      <div align="center">PF</div>
    </td>
    <td width="6%"> 
      <div align="center">　</div>
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    <td width="8%"> 
      <div align="center">CF</div>
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<p><span class="p9"><br>
  <span class="p9">条件码：<br>
  ①OF（Overflow Flag)溢出标志。溢出时为1,否则置0。<br>
  ②SF（Sign Flag）符号标志。结果为负时置1,否则置0.<br>
  ③ZF（Zero Flag)零标志，运算结果为0时ZF位置1,否则置0.<br>
  ④CF（Carry Flag)进位标志，进位时置1,否则置0.<br>
  ⑤AF（Auxiliary carry Flag）辅助进位标志，记录运算时第3位（半个字节）产生的进位置。有进位时1,否则置0.<br>
  ⑥PF（Parity Flag）奇偶标志。结果操作数中1的个数为偶数时置1,否则置0.</span></span></p>
<p><span class="p9"><span class="p9">控制标志位：<br>
  ⑦DF（Direction Flag）方向标志，在串处理指令中控制信息的方向。</span><br>
  ⑧IF（Interrupt Flag）中断标志。<br>
  ⑨TF（Trap Flag）陷井标志。</span></p>
<p class="p9"><b><font color="#000000">二、 直接标志转移（8位寻址）</font></b></p>
<table width="100%" border="1" cellspacing="0" bordercolordark="#FFFFDF" bordercolorlight="#CCCCCC">
  <tr> 
    <td width="9%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">指令格式</div>
    </td>
    <td width="8%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">机器码</div>
    </td>
    <td width="9%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">测试条件</div>
    </td>
    <td width="23%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">如...则转移</div>
    </td>
    <td rowspan="9" width="1%" class="p9"> 
      <div align="center">　</div>
      <div align="center">　</div>
    </td>
    <td width="12%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">指令格式</div>
    </td>
    <td width="9%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">机器码</div>
    </td>
    <td width="12%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">测试条件</div>
    </td>
    <td width="17%" class="p9" bgcolor="#CCCCFF"> 
      <div align="center">如...则转移</div>
    </td>
  </tr>
  <tr> 
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JC </div>
    </td>
    <td width="8%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">72</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">C=1</div>
    </td>
    <td width="23%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">有进位</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JNS</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">79</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">S=0</div>
    </td>
    <td width="17%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">正号</div>
    </td>
  </tr>
  <tr> 
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JNC </div>
    </td>
    <td width="8%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">73</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">C=0</div>
    </td>
    <td width="23%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">无进位</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JO</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">70</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">O=1</div>
    </td>
    <td width="17%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">有溢出</div>
    </td>
  </tr>
  <tr> 
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JZ/JE </div>
    </td>
    <td width="8%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">74</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">Z=1</div>
    </td>
    <td width="23%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">零/等于</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JNO</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">71</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">O=0</div>
    </td>
    <td width="17%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">无溢出</div>
    </td>
  </tr>
  <tr> 
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JNZ/JNE </div>
    </td>
    <td width="8%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">75</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">Z=0</div>
    </td>
    <td width="23%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">不为零/不等于</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JP/JPE</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">7A</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">P=1</div>
    </td>
    <td width="17%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">奇偶位为偶</div>
    </td>
  </tr>
  <tr> 
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JS</div>
    </td>
    <td width="8%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">78</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">S=1</div>
    </td>
    <td width="23%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">负号</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">JNP/IPO</div>
    </td>
    <td width="9%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">7B</div>
    </td>
    <td width="12%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">P=0</div>
    </td>
    <td width="17%" class="p9" bgcolor="#FFFFDF"> 
      <div align="center">奇偶位为奇</div>
    </td>
  </tr>
</table>
<p class="p9"><b><font color="#000000">三、间接标志转移（8位寻址）</font></b></p>
<table width="100%" border="1" cellspacing="0" bordercolordark="#FFFFDF" bordercolorlight="#CCCCCC">
  <tr bgcolor="#CCCCFF"> 
    <td class="p9" width="27%"> 
      <div align="center">指令格式</div>
    </td>
    <td class="p9" width="15%"> 
      <div align="center">机器码</div>
    </td>
    <td class="p9" width="28%"> 
      <div align="center">测试格式</div>
    </td>
    <td class="p9" width="30%"> 
      <div align="center">如...则转移</div>
    </td>
  </tr>
  <tr bgcolor="#FFFFDF"> 
    <td class="p9" width="27%"> 
      <div align="center">JA/JNBE(比较无符号数)</div>
    </td>
    <td class="p9" width="15%"> 
      <div align="center">77</div>
    </td>
    <td class="p9" bgcolor="#FFFFDF" width="28%"> 
      <div align="center">C或Z=0</div>
    </td>
    <td class="p9" width="30%"> 
      <div align="center">&gt; 　高于/不低于或等于</div>
    </td>
  </tr>
  <tr bgcolor="#FFFFDF"> 
    <td class="p9" width="27%"> 
      <div align="center">JAE/JNB(比较无符号数)</div>
    </td>
    <td class="p9" width="15%"> 
      <div align="center">73</div>
    </td>
    <td class="p9" width="28%"> 
      <div align="center">C=0</div>
    </td>
    <td class="p9" width="30%"> 
      <div align="center">&gt;=　 高于或等于/不低于</div>
    </td>
  </tr>
123

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