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<p class=ab><a name="_Toc57984849"></a><a name="_Toc53320672"><span
style='font-family:黑体'>程序</span><span lang=EN-US>14-17
linux/include/asm/system.h</span></a></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>移动到用户模式运行。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>该函数利用<span lang=EN-US>iret</span>指令实现从内核模式移动到初始任务<span
lang=EN-US>0</span>中去执行。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u>
#define <u><span style='color:blue'>move_to_user_mode</span></u>() \</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u>
__asm__ (<i>&quot;movl %%esp,%%eax\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>保存堆栈指针<span lang=EN-US>esp</span><span lang=EN-US>eax</span>寄存器中。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;pushl $0x17\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>首先将堆栈段选择符<span lang=EN-US>(SS)</span>入栈。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;pushl %%eax\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>然后将保存的堆栈指针值<span lang=EN-US>(esp)</span>入栈。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;pushfl\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将标志寄存器<span lang=EN-US>(eflags)</span>内容入栈。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;pushl $0x0f\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span><span lang=EN-US>Task0</span>代码段选择符<span
lang=EN-US>(cs)</span>入栈。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;pushl $1f\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; // </span>将下面标号<span lang=EN-US>1</span>的偏移地址<span
lang=EN-US>(eip)</span>入栈。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;iret\n&quot;</i>
\&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>执行中断返回指令,则会跳转到下面标号<span lang=EN-US>1</span>处。</p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;1:\tmovl $0x17,%%eax\n\t&quot;</i> \&nbsp;&nbsp; // </span>此时开始执行任务<span
lang=EN-US>0</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %%ax,%%ds\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>初始化段寄存器指向本局部表的数据段。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %%ax,%%es\n\t&quot;</i> \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %%ax,%%fs\n\t&quot;</i> \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %%ax,%%gs&quot;</i> \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
:::<i>&quot;ax&quot;</i>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u>
#define <u><span style='color:blue'>sti</span></u>() __asm__ (<i>&quot;sti&quot;</i>::)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>开中断嵌入汇编宏函数。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u>
#define <u><span style='color:blue'>cli</span></u>() __asm__ (<i>&quot;cli&quot;</i>::)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>关中断。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u>
#define <u><span style='color:blue'>nop</span></u>() __asm__ (<i>&quot;nop&quot;</i>::)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>空操作。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u>
#define <u><span style='color:blue'>iret</span></u>() __asm__ (<i>&quot;iret&quot;</i>::)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>中断返回。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>设置门描述符宏。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>根据参数中的中断或异常处理过程地址<span
lang=EN-US>addr</span>、门描述符类型<span lang=EN-US>type</span>和特权级信息<span
lang=EN-US>dpl</span>,设置位于</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>地址<span lang=EN-US>gate_addr</span>处的门描述符。(注意:下面“偏移”值是相对于内核代码或数据段来说的)。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>gate_addr
-</span>描述符地址;<span lang=EN-US>type -</span>描述符类型域值;<span lang=EN-US>dpl -</span>描述符特权级;<span
lang=EN-US>addr -</span>偏移地址。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // %0 - (</span><span
lang=EN-US>dpl,type</span>组合成的类型标志字<span lang=EN-US>)</span><span lang=EN-US>%1
- (</span>描述符低<span lang=EN-US>4</span>字节地址<span lang=EN-US>)</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // %2 - (</span>描述符高<span
lang=EN-US>4</span>字节地址<span lang=EN-US>)</span><span lang=EN-US>%3 - edx(</span>程序偏移地址<span
lang=EN-US>addr)</span><span lang=EN-US>%4 - eax(</span>高字中含有段选择符<span
lang=EN-US>0x8)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u>
#define <u><span style='color:blue'>_set_gate</span></u>(gate_addr,type,dpl,addr)
\</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>
__asm__ (<i>&quot;movw %%dx,%%ax\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将偏移地址低字与选择符组合成描述符低<span lang=EN-US>4</span>字节<span lang=EN-US>(eax)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %0,%%dx\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将类型标志字与偏移高字组合成描述符高<span lang=EN-US>4</span>字节<span lang=EN-US>(edx)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movl %%eax,%1\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>分别设置门描述符的低<span lang=EN-US>4</span>字节和高<span lang=EN-US>4</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movl %%edx,%2&quot;</i> \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
: \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
: <i>&quot;i&quot;</i> ((short) (0x8000+(dpl&lt;&lt;13)+(type&lt;&lt;8))), \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;o&quot;</i> (*((char *) (gate_addr))), \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;o&quot;</i> (*(4+(char *) (gate_addr))), \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;d&quot;</i> ((char *) (addr)),<i>&quot;a&quot;</i> (0x00080000))</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>设置中断门函数(自动屏蔽随后的中断)。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>n
- </span>中断号;<span lang=EN-US>addr - </span>中断程序偏移地址。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // &amp;idt[n]</span>是中断描述符表中中断号<span
lang=EN-US>n</span>对应项的偏移值;中断描述符的类型是<span lang=EN-US>14</span>,特权级是<span
lang=EN-US>0</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u>
#define <u><span style='color:blue'>set_intr_gate</span></u>(n,addr) \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>_set_gate</span></u>(&amp;<u><span
style='color:blue'>idt</span></u>[n],14,0,addr)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>35</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>设置陷阱门函数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>n
- </span>中断号;<span lang=EN-US>addr - </span>中断程序偏移地址。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // &amp;idt[n]</span>是中断描述符表中中断号<span
lang=EN-US>n</span>对应项的偏移值;中断描述符的类型是<span lang=EN-US>15</span>,特权级是<span
lang=EN-US>0</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>36</span></u>
#define <u><span style='color:blue'>set_trap_gate</span></u>(n,addr) \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>_set_gate</span></u>(&amp;<u><span
style='color:blue'>idt</span></u>[n],15,0,addr)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>设置系统陷阱门函数。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>上面<span lang=EN-US>set_trap_gate()</span>设置的描述符的特权级为<span
lang=EN-US>0</span>,而这里是<span lang=EN-US>3</span>。因此<span lang=EN-US>set_system_gate()</span>设置的</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>中断处理过程能够被所有程序执行。例如单步调试、溢出出错和边界超出出错处理。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>n
- </span>中断号;<span lang=EN-US>addr - </span>中断程序偏移地址。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // &amp;idt[n]</span>是中断描述符表中中断号<span
lang=EN-US>n</span>对应项的偏移值;中断描述符的类型是<span lang=EN-US>15</span>,特权级是<span
lang=EN-US>3</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u>
#define <u><span style='color:blue'>set_system_gate</span></u>(n,addr) \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<u><span style='color:blue'>_set_gate</span></u>(&amp;<u><span
style='color:blue'>idt</span></u>[n],15,3,addr)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>设置段描述符函数(内核中没有用到)。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>gate_addr
-</span>描述符地址;<span lang=EN-US>type -</span>描述符中类型域值;<span lang=EN-US>dpl -</span>描述符特权层值;</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // base - </span>段的基地址;<span
lang=EN-US>limit - </span>段限长。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>请参见段描述符的格式。注意,这里赋值对象弄反了。<span
lang=EN-US>43</span>行应该是 <span lang=EN-US>*((gate_addr)+1)</span>,而</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // 49</span>行才是 <span
lang=EN-US>*(gate_addr)</span>。不过内核代码中没有用到这个宏,所以<span lang=EN-US>Linus</span>没有察觉<span
lang=EN-US> :-)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u>
#define <u><span style='color:blue'>_set_seg_desc</span></u>(gate_addr,type,dpl,base,limit)
{\</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*(gate_addr) = ((base) &amp; 0xff000000) | \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>描述符低<span lang=EN-US>4</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(((base) &amp; 0x00ff0000)&gt;&gt;16) | \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
((limit) &amp; 0xf0000) | \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
((dpl)&lt;&lt;13) | \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(0x00408000) | \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
((type)&lt;&lt;8); \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
*((gate_addr)+1) = (((base) &amp; 0x0000ffff)&lt;&lt;16) | \&nbsp;&nbsp; // </span>描述符高<span
lang=EN-US>4</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
((limit) &amp; 0x0ffff); }</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>在全局表中设置任务状态段<span
lang=EN-US>/</span>局部表描述符。状态段和局部表段的长度均被设置成<span lang=EN-US>104</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // </span>参数:<span lang=EN-US>n
- </span>在全局表中描述符项<span lang=EN-US>n</span>所对应的地址;<span lang=EN-US>addr - </span>状态段<span
lang=EN-US>/</span>局部表所在内存的基地址。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;
//&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; type - </span>描述符中的标志类型字节。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // %0 - eax(</span>地址<span
lang=EN-US>addr)</span><span lang=EN-US>%1 - (</span>描述符项<span lang=EN-US>n</span>的地址<span
lang=EN-US>)</span><span lang=EN-US>%2 - (</span>描述符项<span lang=EN-US>n</span>的地址偏移<span
lang=EN-US>2</span><span lang=EN-US>)</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // %3 - (</span>描述符项<span
lang=EN-US>n</span>的地址偏移<span lang=EN-US>4</span><span lang=EN-US>)</span><span
lang=EN-US>%4 - (</span>描述符项<span lang=EN-US>n</span>的地址偏移<span lang=EN-US>5</span><span
lang=EN-US>)</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // %5 - (</span>描述符项<span
lang=EN-US>n</span>的地址偏移<span lang=EN-US>6</span><span lang=EN-US>)</span><span
lang=EN-US>%6 - (</span>描述符项<span lang=EN-US>n</span>的地址偏移<span lang=EN-US>7</span><span
lang=EN-US>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u>
#define <u><span style='color:blue'>_set_tssldt_desc</span></u>(n,addr,type) \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u>
__asm__ (<i>&quot;movw $104,%1\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span><span lang=EN-US>TSS</span>(或<span lang=EN-US>LDT</span>)长度放入描述符长度域<span
lang=EN-US>(</span><span lang=EN-US>0-1</span>字节<span lang=EN-US>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movw %%ax,%2\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将基地址的低字放入描述符第<span lang=EN-US>2-3</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;rorl $16,%%eax\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将基地址高字右循环移入<span lang=EN-US>ax</span>中(低字则进入高字处)。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movb %%al,%3\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将基地址高字中低字节移入描述符第<span lang=EN-US>4</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movb $&quot;</i> type <i>&quot;,%4\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将标志类型字节移入描述符的第<span lang=EN-US>5</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>58</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movb $0x00,%5\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>描述符的第<span lang=EN-US>6</span>字节置<span lang=EN-US>0</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;movb %%ah,%6\n\t&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>将基地址高字中高字节移入描述符第<span lang=EN-US>7</span>字节。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;rorl $16,%%eax&quot;</i> \&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
// </span>再右循环<span lang=EN-US>16</span>比特,<span lang=EN-US>eax</span>恢复原值。</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
::<i>&quot;a&quot;</i> (addr), <i>&quot;m&quot;</i> (*(n)), <i>&quot;m&quot;</i>
(*(n+2)), <i>&quot;m&quot;</i> (*(n+4)), \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<i>&quot;m&quot;</i> (*(n+5)), <i>&quot;m&quot;</i> (*(n+6)), <i>&quot;m&quot;</i>
(*(n+7)) \</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>64</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>在全局表中设置任务状态段描述符。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // n - </span>是该描述符的指针;<span
lang=EN-US>addr - </span>是描述符项中段的基地址值。任务状态段描述符的类型是<span lang=EN-US>0x89</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>65</span></u>
#define <u><span style='color:blue'>set_tss_desc</span></u>(n,addr) <u><span
style='color:blue'>_set_tssldt_desc</span></u>(((char *) (n)),addr,<i>&quot;0x89&quot;</i>)</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; //// </span>在全局表中设置局部表描述符。</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; // n - </span>是该描述符的指针;<span
lang=EN-US>addr - </span>是描述符项中段的基地址值。局部表段描述符的类型是<span lang=EN-US>0x82</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u>
#define <u><span style='color:blue'>set_ldt_desc</span></u>(n,addr) <u><span
style='color:blue'>_set_tssldt_desc</span></u>(((char *) (n)),addr,<i>&quot;0x82&quot;</i>)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u> </span></p>
<div class=a align=center style='text-align:center'><span lang=EN-US>
<hr size=4 width="100%" align=center>
</span></div>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
<p class=MsoNormal><span lang=EN-US>&nbsp;</span></p>
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