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第</font><font SIZE="5">3</font><font FACE="楷体_GB2312" LANG="ZH-CN" SIZE="5">章<br>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.1
</font><font size="3"> </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">3</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">DS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">4</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">FS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">5</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">6</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">DS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">7</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">DS
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">8</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">ES</p>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.2
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="3"> （</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）正确</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）类型不匹配</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">3</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）两个操作数不能同时是内存操作数</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">4</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）没有</font><font SIZE="3">[esp][eax*3]</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">这种操作数形式</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">5</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）正确</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">6</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CS</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">不能作为目的操作数</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">7</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）类型不确定</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">8</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）没有</font><font SIZE="3">[sp]</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">这种操作数形式</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">9</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）条件转移指令的操作数只能是标号</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">10</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）正确</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">11</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）不能将立即数送段寄存器</font><font SIZE="3">
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">12</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）没有</font><font SIZE="3">bx+2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">这种操作数形式</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.3
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="3"> （</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">27feh
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">2a00h
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">3</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">2802h
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">4</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">2801h</p>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"></font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
（</font><font SIZE="3">5</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">27feh</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（段内调用）或</font><font SIZE="3">27fch</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（段间调用)</font></p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20"><font face="??ì?,SimSun" lang="ZH-CN" size="3">（6）2802h（段内返回）或2804h（段间返回）
（7）27fch （8）2804h</font></p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.4
DEC</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">指令不影响</font><font SIZE="3">CF</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">，</font><font SIZE="3">SUB</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">指令影响</font><font SIZE="3">CF</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">。</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.5
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">不能。转移类指令（如</font><font SIZE="3">JMP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">、</font><font SIZE="3">Jcc</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">、</font><font SIZE="3">LOOP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">、</font><font SIZE="3">CALL</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">、</font><font SIZE="3">RET</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">等）的执行会改变</font><font SIZE="3">IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">的值。</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.6
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="3">
无符号数比较：</p>
<blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">ZF
= 1 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">ZF
= 0 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">3</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CF
= 1 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">4</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CF
= 1 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">或</font><font SIZE="3">
ZF = 1</p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">5</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CF
= 0 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">且</font><font SIZE="3">
ZF = 0 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" size="3"> （</font><font SIZE="3">6</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">CF
= 0</p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">带符号数比较：</p>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">ZF
= 1 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">ZF
= 0 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">3</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SF
<> OF </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">4</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SF
<> OF </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">或</font><font SIZE="3">
ZF = 1</p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">5</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SF
= OF </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">且</font><font SIZE="3">
ZF = 0 </font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（</font><font SIZE="3">6</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）</font><font SIZE="3">SF=
OF</p>
</blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">3.7
CALL</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">指令执行的操作：</p>
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<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">1</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）返回地址进栈。</p>
<blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段间调用：</font><font SIZE="3">CS</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">与</font><font SIZE="3">IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（下一条指令的地址）依次进栈。</font><font SIZE="3"></p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段内调用：</font><font SIZE="3">IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">（下一条指令的</font><font SIZE="3">16</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">位偏移地址）进栈。</font><font SIZE="3"></p>
</blockquote>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">（</font><font SIZE="3">2</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">）转移到过程的第一条指令去执行。</p>
<blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段间调用：根据操作数，将</font><font SIZE="3">32</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">位分段地址送</font><font SIZE="3">CS:IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">。</font><font SIZE="3"></p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段内调用：根据操作数，将</font><font SIZE="3">16</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">位偏移地址送</font><font SIZE="3">IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">。</font><font SIZE="3"></p>
</blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">RET</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">指令执行的操作：将返回地址出栈，从而实现转移到返回地址处。</p>
<blockquote>
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段间返回：出栈一个双字到</font><font SIZE="3">CS:IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">。</font><font SIZE="3"></p>
</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">
<p ALIGN="JUSTIFY" style="text-indent: 40; margin-left: 20; margin-right: 20">段内返回：出栈一个字到</font><font SIZE="3">IP</font><font FACE="??ì?,SimSun" LANG="ZH-CN" SIZE="3">。</font><font SIZE="3"></p>
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