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oldlinux-website/Book-Lite/code-list/html/P8-3.html
oldlinux-web f4246288ef Modify the content-type with quarts
2024-03-17 11:46:04 +08:00

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<html>
<head>
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pre
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span.1Char
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span.3CharChar5
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span.2Char
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<div class=WordSection1 style='layout-grid:15.6pt'>
<p class=ab><a name="_Toc53320605"><span style='font-family:<3A><><EFBFBD><EFBFBD>'><EFBFBD><EFBFBD><EFBFBD><EFBFBD></span><span
lang=EN-US>8-3 linux/kernel/sys_call.s</span></a><span lang=EN-US> </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=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>1</span></u> /*</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>2</span></u>&nbsp;
*&nbsp; linux/kernel/system_call.s</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>3</span></u>&nbsp;
*</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>4</span></u>&nbsp;
*&nbsp; (C) 1991&nbsp; Linus Torvalds</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>5</span></u>&nbsp;
*/</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>6</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>7</span></u> /*</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>8</span></u>&nbsp;
*&nbsp; system_call.s&nbsp; contains the system-call low-level handling
routines.</span></p>
<p class=a><span lang=EN-US>&nbsp; <u><span style='color:blue'>9</span></u>&nbsp;
* This also contains the timer-interrupt handler, as some of the code is</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>10</span></u>&nbsp;
* the same. The hd- and flopppy-interrupts are also here.</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>11</span></u>&nbsp;
*</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>12</span></u>&nbsp;
* NOTE: This code handles signal-recognition, which happens every time</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>13</span></u>&nbsp;
* after a timer-interrupt and after each system call. Ordinary interrupts</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>14</span></u>&nbsp;
* don't handle signal-recognition, as that would clutter them up totally</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>15</span></u>&nbsp;
* unnecessarily.</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>16</span></u>&nbsp;
*</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>17</span></u>&nbsp;
* Stack layout in 'ret_from_system_call':</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>18</span></u>&nbsp;
*</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>19</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 0(%esp) - %eax</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>20</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 4(%esp) - %ebx</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>21</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 8(%esp) - %ecx</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>22</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; C(%esp) - %edx</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>23</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 10(%esp) - original
%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (-1 if not system call)</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>24</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 14(%esp) - %fs</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>25</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 18(%esp) - %es</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>26</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1C(%esp) - %ds</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>27</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 20(%esp) - %eip</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>28</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 24(%esp) - %cs</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>29</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 28(%esp) - %eflags</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>30</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2C(%esp) - %oldesp</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>31</span></u>&nbsp;
*&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 30(%esp) - %oldss</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>32</span></u>&nbsp;
*/</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * system_call.s</span><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><span
lang=EN-US>system-call</span><EFBFBD><EFBFBD><EFBFBD>ײ㴦<EFBFBD><EFBFBD><EFBFBD>ӳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƚ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͬʱҲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>timer-interrupt</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD>̺<EFBFBD><EFBFBD><EFBFBD><EFBFBD>̵<EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; *</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span>ע<EFBFBD>⣺<EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD>봦<EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><span
lang=EN-US>signal</span><EFBFBD><EFBFBD>ʶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>жϺ<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD>󶼻<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʶ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD>жϹ<EFBFBD><EFBFBD>̲<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>ʶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD>ɻ<EFBFBD><EFBFBD>ҡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; *</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD>أ<EFBFBD><span
lang=EN-US>'ret_from_system_call'</span><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>19-30</span><EFBFBD>С<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>Linus</span>ԭע<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>жϹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><span
lang=EN-US>int 0x80</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><span lang=EN-US>int 0x20</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD>жϻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD>û<EFBFBD>̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD>жϹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>ʶ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>Ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϺ<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>жϹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>źŵ<EFBFBD>ʶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Υ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ޱ<EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>33</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>34</span></u>
SIG_CHLD&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 17&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>SIG_CHLD</span><EFBFBD>źţ<EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD><EFBFBD>ֹͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;<u><span style='color:blue'>36</span></u>
EAX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0x00&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ջ<EFBFBD>и<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>λ<EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>37</span></u>
EBX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 0x04</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>38</span></u>
ECX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0x08</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>39</span></u>
EDX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0x0C</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>40</span></u>
ORIG_EAX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 0x10&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵΪ<span lang=EN-US>-1</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>41</span></u>
FS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
= 0x14</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>42</span></u>
ES&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
= 0x18</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>43</span></u>
DS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
= 0x1C</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>44</span></u>
EIP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0x20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #
44 -- 48</span><EFBFBD><EFBFBD> <20><><span lang=EN-US>CPU</span><EFBFBD>Զ<EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>45</span></u>
CS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
= 0x24</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>46</span></u>
EFLAGS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 0x28</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>47</span></u>
OLDESP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 0x2C&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD>仯ʱ<EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>ջָ<EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>48</span></u>
OLDSS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; = 0x30</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>49</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Щ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD><EFBFBD><span
lang=EN-US>task_struct</span><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><span lang=EN-US>include/linux/sched.h</span><EFBFBD><EFBFBD><span
lang=EN-US>105</span><EFBFBD>п<EFBFBD>ʼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>50</span></u>
state&nbsp;&nbsp; =
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #
these are offsets into the task-struct.&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>51</span></u>
counter = 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>(</span><EFBFBD>ݼ<EFBFBD><span lang=EN-US>)</span><EFBFBD><EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Ƭ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>52</span></u>
priority = 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<span lang=EN-US>counter=priority</span><EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Խ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>53</span></u>
signal&nbsp; = 12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>λͼ<EFBFBD><EFBFBD>ÿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><EFBFBD>ź<EFBFBD>ֵ<span lang=EN-US>=</span>λƫ<EFBFBD><EFBFBD>ֵ<span lang=EN-US>+1</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>54</span></u>
sigaction = 16&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # MUST be
16 (=len of sigaction) # sigaction</span><EFBFBD>ṹ<EFBFBD><EFBFBD><EFBFBD>ȱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>16</span><EFBFBD>ֽڡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>55</span></u>
blocked = (33*16)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>λͼ<EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>56</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>sigaction</span><EFBFBD>ṹ<EFBFBD>е<EFBFBD>ƫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><span
lang=EN-US>include/signal.h</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>55</span><EFBFBD>п<EFBFBD>ʼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>57</span></u> #
offsets within sigaction</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>58</span></u>
sa_handler = 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
</span><EFBFBD>źŴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̵ľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>59</span></u>
sa_mask = 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# </span><EFBFBD>ź<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>60</span></u>
sa_flags = 8&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
</span><EFBFBD>źż<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>61</span></u>
sa_restorer = 12&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
</span><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD>μ<EFBFBD><span lang=EN-US>kernel/signal.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>62</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>63</span></u>
nr_system_calls = 82&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
Linux 0.12</span><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD>е<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></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;<u><span style='color:blue'>65</span></u>
ENOSYS = 38&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span>ϵͳ<EFBFBD><EFBFBD><EFBFBD>úų<EFBFBD><EFBFBD><EFBFBD><EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>66</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>67</span></u> /*</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>68</span></u>&nbsp;
* Ok, I get parallel printer interrupts while using the floppy for some</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>69</span></u>&nbsp;
* strange reason. Urgel. Now I just ignore them.</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>70</span></u>&nbsp;
*/</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; /*</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; * </span><EFBFBD><EFBFBD><EFBFBD>ˣ<EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>յ<EFBFBD><EFBFBD>˲<EFBFBD><EFBFBD>д<EFBFBD>ӡ<EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֡<EFBFBD><EFBFBD>ǣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; */</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>71</span></u>
.globl _system_call,_sys_fork,_timer_interrupt,_sys_execve</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>72</span></u>
.globl _hd_interrupt,_floppy_interrupt,_parallel_interrupt</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>73</span></u>
.globl _device_not_available, _coprocessor_error</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>74</span></u> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ϵͳ<EFBFBD><EFBFBD><EFBFBD>úŴ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>س<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>-ENOSYS</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>75</span></u>
.align 2&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
</span><EFBFBD>ڴ<EFBFBD><span lang=EN-US>4</span><EFBFBD>ֽڶ<EFBFBD><EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>76</span></u>
bad_sys_call:</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>77</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl $-ENOSYS&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;#
eax</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>-ENOSYS</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>78</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jmp ret_from_sys_call</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>е<EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>schedule()</span><EFBFBD>ڣ<EFBFBD><span lang=EN-US>kernel/sched.c</span><EFBFBD><EFBFBD><span
lang=EN-US>119</span><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>schedule()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ʹ<EFBFBD><span
lang=EN-US>ret_from_sys_call</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>107</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>С<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>79</span></u>
.align 2</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>80</span></u>
reschedule:</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>81</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl $ret_from_sys_call&nbsp; &nbsp;# </span><EFBFBD><EFBFBD><span lang=EN-US>ret_from_sys_call</span><EFBFBD>ĵ<EFBFBD>ַ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><span
lang=EN-US>107</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>82</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jmp _schedule</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int 0x80 --linux</span>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ㣨<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span
lang=EN-US>int 0x80</span><EFBFBD><EFBFBD><span lang=EN-US>eax</span><EFBFBD><EFBFBD><EFBFBD>ǵ<EFBFBD><EFBFBD>úţ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>83</span></u>
.align 2</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>84</span></u>
_system_call:</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>85</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
push %ds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD>μĴ<EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>86</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
push %es</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>87</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
push %fs</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>88</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl
%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# save the orig_eax&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eax</span>ԭֵ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp; &nbsp;# </span>һ<EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɴ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>Բ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><span lang=EN-US>ebx</span><EFBFBD><EFBFBD><span
lang=EN-US>ecx</span><EFBFBD><EFBFBD><span lang=EN-US>edx</span><EFBFBD>з<EFBFBD><EFBFBD><EFBFBD>ϵͳ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӧ<span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD>Ժ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>99</span><EFBFBD>У<EFBFBD><EFBFBD>ĵ<EFBFBD><EFBFBD>ò<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⼸<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>GNU gcc</span><EFBFBD>涨<EFBFBD>ģ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # ebx</span><EFBFBD>пɴ<EFBFBD>ŵ<EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ecx</span><EFBFBD>д<EFBFBD>ŵ<EFBFBD><span lang=EN-US>2</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>edx</span><EFBFBD>д<EFBFBD>ŵ<EFBFBD><span lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɲμ<EFBFBD>ͷ<EFBFBD>ļ<EFBFBD><span
lang=EN-US>include/unistd.h</span><EFBFBD>е<EFBFBD><span lang=EN-US>150</span><EFBFBD><EFBFBD><span
lang=EN-US>200</span><EFBFBD>е<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>úꡣ</p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>89</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl
%edx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>90</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl
%ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# push %ebx,%ecx,%edx as parameters</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>91</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
pushl %ebx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
to the system call</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>ڱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>μĴ<EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ds,es</span>ָ<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>fs</span>ָ<EFBFBD><EFBFBD>ǰ<EFBFBD>ֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ִ<EFBFBD>б<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD>ע<EFBFBD>⣬<EFBFBD><EFBFBD><span
lang=EN-US>Linux 0.12</span><EFBFBD><EFBFBD><EFBFBD>ں˸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ص<EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǵĶλ<EFBFBD>ַ<EFBFBD>Ͷ<EFBFBD><EFBFBD>޳<EFBFBD><EFBFBD><EFBFBD>ͬ<EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><span
lang=EN-US>fork.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>copy_mem()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>92</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
movl $0x10,%edx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;#
set up ds,es to kernel space</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>93</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov %dx,%ds</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>94</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov %dx,%es</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>95</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
movl $0x17,%edx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;#
fs points to local data space</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>96</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
mov %dx,%fs</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>97</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
cmpl _NR_syscalls,%eax&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Χ<EFBFBD>Ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>98</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
jae bad_sys_call</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ַ<span
lang=EN-US>=[_sys_call_table + %eax * 4]</span><EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # sys_call_table[]</span><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>飬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>include/linux/sys.h</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>82</span><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ַ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;<u><span style='color:blue'>99</span></u>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
call _sys_call_table(,%eax,4)&nbsp; &nbsp;# </span><EFBFBD><EFBFBD>ӵ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# </span><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>101-106</span><EFBFBD>в鿴<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ھ<EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD><EFBFBD><span
lang=EN-US>state</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȥִ<EFBFBD>е<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ھ<EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Ƭ<EFBFBD>Ѿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>꣨<span
lang=EN-US>counter=0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳȥִ<EFBFBD>е<EFBFBD><EFBFBD>ȳ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>統<EFBFBD><EFBFBD>̨<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĽ<EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>п<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ն˶<EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ôĬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>¸ú<EFBFBD>̨<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>н<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>յ<EFBFBD><span lang=EN-US>SIGTTIN</span><EFBFBD><EFBFBD><span
lang=EN-US>SIGTTOU</span><EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>½<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>н<EFBFBD><EFBFBD>̴<EFBFBD><EFBFBD><EFBFBD>ֹͣ״̬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ء<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
lang=EN-US> 2:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl _current,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# </span>ȡ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD>񣨽<EFBFBD><EFBFBD>̣<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݽṹָ<EFBFBD><EFBFBD><span lang=EN-US style='font-family:
Wingdings'><EFBFBD><EFBFBD></span><span lang=EN-US>eax</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmpl
$0,state(%eax)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # state</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne reschedule</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmpl
$0,counter(%eax)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # counter</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; je reschedule</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>д<EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>غ󣬶<EFBFBD><EFBFBD>źŽ<EFBFBD><EFBFBD><EFBFBD>ʶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD>ʱҲ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>жϹ<EFBFBD><EFBFBD>̣<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>131</span><EFBFBD><EFBFBD><EFBFBD>ϵĴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span lang=EN-US>int 16</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>б<EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD>dz<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>task0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򲻱ض<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>ӷ<EFBFBD><EFBFBD>ء<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # 109</span><EFBFBD><EFBFBD><EFBFBD>ϵ<EFBFBD><span lang=EN-US>_task</span><EFBFBD><EFBFBD>Ӧ<span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><span lang=EN-US>task[]</span><EFBFBD><EFBFBD><EFBFBD>飬ֱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>task</span><EFBFBD>൱<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>task[0]</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
lang=EN-US> ret_from_sys_call:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl _current,%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmpl
_task,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #
task[0] cannot have signals</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; je 3f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ǰ<span lang=EN-US>(forward)</span><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>3</span><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ͨ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϵ<EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD>жϡ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>ִ̬<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ռ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƚ<EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>Ϊ<EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ε<EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD> <span
lang=EN-US>0x000f</span><EFBFBD><EFBFBD><span
lang=EN-US>RPL=3</span><EFBFBD><EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Σ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD>жϷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span
lang=EN-US>16</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>107</span><EFBFBD><EFBFBD>ִ<EFBFBD>е<EFBFBD><EFBFBD>ˣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD>˳<EFBFBD><EFBFBD>жϳ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>⣬<EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0x17</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD>Ҳ˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>õĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmpw $0x0f,CS(%esp)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # was old code segment supervisor ?</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne 3f</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cmpw
$0x17,OLDSS(%esp)&nbsp;&nbsp;&nbsp;&nbsp; # was stack segment = 0x17 ?</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne 3f</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD>루<span
lang=EN-US>115-128</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD><EFBFBD>źš<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD>е<EFBFBD><EFBFBD>ź<EFBFBD>λͼ<EFBFBD><EFBFBD><span lang=EN-US>32</span>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ÿλ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ṹ<EFBFBD>е<EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Σ<EFBFBD><EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>λ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>ٰ<EFBFBD>ԭ<EFBFBD>ź<EFBFBD>λͼ<EFBFBD>и<EFBFBD><EFBFBD>źŶ<EFBFBD>Ӧ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>󽫸<EFBFBD><EFBFBD>ź<EFBFBD>ֵ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮һ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>do_signal()</span><EFBFBD><EFBFBD><span
lang=EN-US>do_signal()</span><EFBFBD>ڣ<EFBFBD><span lang=EN-US>kernel/signal.c,128</span><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>13</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>do_signal()</span><EFBFBD><EFBFBD><EFBFBD>źŴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD>ٿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD>̻<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>źš<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
signal(%eax),%ebx&nbsp;&nbsp;&nbsp;&nbsp; # </span>ȡ<EFBFBD>ź<EFBFBD>λͼ<span lang=EN-US
style='font-family:Wingdings'><EFBFBD><EFBFBD></span><span lang=EN-US>ebx</span><EFBFBD><EFBFBD>ÿ<span
lang=EN-US>1</span>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>32</span><EFBFBD><EFBFBD><EFBFBD>źš<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
blocked(%eax),%ecx&nbsp;&nbsp;&nbsp; # </span>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Σ<EFBFBD><EFBFBD>ź<EFBFBD>λͼ<span lang=EN-US
style='font-family:Wingdings'><EFBFBD><EFBFBD></span><span lang=EN-US>ecx</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; notl %ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span>ÿλȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;andl %ebx,%ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɵ<EFBFBD><EFBFBD>ź<EFBFBD>λͼ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; bsfl %ecx,%ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD>ӵ<EFBFBD>λ<EFBFBD><EFBFBD>λ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼɨ<EFBFBD><EFBFBD>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ecx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>ƫ<EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڼ<EFBFBD>λ<span lang=EN-US>0--31</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; je 3f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD>ת<EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; btrl %ecx,%ebx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><span lang=EN-US>ebx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<span lang=EN-US>signal</span>λͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
%ebx,signal(%eax)&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>±<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>signal</span>λͼ<EFBFBD><EFBFBD>Ϣ<span
lang=EN-US style='font-family:Wingdings'><EFBFBD><EFBFBD></span><span lang=EN-US>current-&gt;signal</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; incl %ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD>źŵ<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1--32</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD>ź<EFBFBD>ֵ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>do_signal</span><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD>֮һ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call _do_signal&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>źŴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>kernel/signal.c</span><EFBFBD><EFBFBD><span
lang=EN-US>128</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>ֵ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testl %eax, %eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD>Է<EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>2</span><EFBFBD><EFBFBD><span
lang=EN-US>101</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne
2b&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
see if we need to switch tasks, or do more signals</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
lang=EN-US> 3:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# eax</span><EFBFBD>к<EFBFBD><EFBFBD>е<EFBFBD><span lang=EN-US>100</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ebx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; addl $4,
%esp&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
skip orig_eax&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ԭ<span lang=EN-US>eax</span>ֵ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iret</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int16 -- </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD><span
lang=EN-US>&nbsp; </span><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޴<EFBFBD><EFBFBD><EFBFBD><EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ⲿ<EFBFBD>Ļ<EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>쳣<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>⵽<EFBFBD>Լ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ͻ<EFBFBD>ͨ<EFBFBD><EFBFBD><span
lang=EN-US>ERROR</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>֪ͨ<span lang=EN-US>CPU</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD><EFBFBD>źš<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>תȥִ<EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>math_error()</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>kernel/math/error.c
11</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>غ<EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ret_from_sys_call</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>С<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
lang=EN-US> .align 2</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
lang=EN-US> _coprocessor_error:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$-1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;# fill in -1 for orig_eax&nbsp; # </span><EFBFBD><EFBFBD><span
lang=EN-US>-1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ebx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x10,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# ds,es</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x17,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# fs</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$ret_from_sys_call&nbsp; &nbsp;# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD>صĵ<EFBFBD>ַ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jmp _math_error&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# </span>ִ<EFBFBD><EFBFBD><span lang=EN-US>math_error()</span><EFBFBD><EFBFBD><span lang=EN-US>kernel/math/error.c</span><EFBFBD><EFBFBD><span
lang=EN-US>11</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int7 -- </span><EFBFBD>豸<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڻ<EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڡ<EFBFBD><span
lang=EN-US>&nbsp; </span><EFBFBD><EFBFBD><EFBFBD>ͣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>޴<EFBFBD><EFBFBD><EFBFBD><EFBFBD>롣</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƼĴ<EFBFBD><EFBFBD><EFBFBD> <span
lang=EN-US>CR0 </span><EFBFBD><EFBFBD><span lang=EN-US>EM</span><EFBFBD><EFBFBD>ģ<EFBFBD>⣩<EFBFBD><EFBFBD>־<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CPU
</span>ִ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ʱ<EFBFBD>ͻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>жϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CPU</span><EFBFBD>Ϳ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ģ<EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><span
lang=EN-US>181</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # CR0</span><EFBFBD>Ľ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<span
lang=EN-US>TS</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US> CPU</span>ִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>õġ<EFBFBD><span lang=EN-US>TS
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȷ<EFBFBD><EFBFBD>ʲôʱ<EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>е<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CPU
</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD>е<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ƥ<EFBFBD><EFBFBD><EFBFBD>ˡ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>CPU </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>TS</span><EFBFBD><EFBFBD>λʱ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>ͻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>Ϳ<EFBFBD><EFBFBD>Ա<EFBFBD><EFBFBD><EFBFBD>ǰһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>״̬<EFBFBD><EFBFBD><span lang=EN-US>176</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD>μ<EFBFBD><span
lang=EN-US>kernel/sched.c</span><EFBFBD><EFBFBD><span lang=EN-US>92</span><EFBFBD>С<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD>Ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ret_from_sys_call</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȥ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ⲣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
lang=EN-US> .align 2</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
lang=EN-US> _device_not_available:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$-1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# fill in -1 for orig_eax&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>-1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ebx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x10,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# ds,es</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x17,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# fs</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%fs</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp; &nbsp;# </span><EFBFBD><EFBFBD><span lang=EN-US>CR0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<span
lang=EN-US>TS</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<span lang=EN-US>CR0</span>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>־<span
lang=EN-US>EM</span>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # EM</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Э<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>״̬<EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <span lang=EN-US>math_state_restore()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڷ<EFBFBD><EFBFBD><EFBFBD>ʱ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ȥִ<EFBFBD><EFBFBD><span lang=EN-US>ret_from_sys_call</span><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD>롣</p>
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$ret_from_sys_call&nbsp; &nbsp;# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><EFBFBD><EFBFBD>õķ<EFBFBD><EFBFBD>ص<EFBFBD>ַ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
clts&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# clear TS so that we can use math</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl %cr0,%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testl
$0x4,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; #
EM (math emulation bit)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; je
_math_state_restore&nbsp;&nbsp;&nbsp; &nbsp;# </span>ִ<EFBFBD><EFBFBD><span lang=EN-US>math_state_restore()</span><EFBFBD><EFBFBD><span
lang=EN-US>kernel/sched.c</span><EFBFBD><EFBFBD><span lang=EN-US>92</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>EM</span><EFBFBD><EFBFBD>־<EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȥִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>math_emulate()</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ebp</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %esi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
temporary storage for ORIG_EIP</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call _math_emulate&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>math/math_emulate.c</span><EFBFBD><EFBFBD><span lang=EN-US>476</span><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; addl $4,%esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>洢<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %edi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %esi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ebp</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ret&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ret</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><EFBFBD><span lang=EN-US>ret_from_sys_call(107</span><EFBFBD><EFBFBD><span
lang=EN-US>)</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int32 -- (int 0x20) </span>ʱ<EFBFBD><EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>Ƶ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>100Hz(include/linux/sched.h,4)</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ʱоƬ<span lang=EN-US>8253/8254</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>(kernel/sched.c,438)</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>ġ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>jiffies</span>ÿ<span
lang=EN-US>10</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>1</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>δ<EFBFBD><EFBFBD>뽫<span lang=EN-US>jiffies</span><EFBFBD><EFBFBD><span
lang=EN-US>1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͽ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>8259</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ǰ<EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>do_timer(long
CPL)</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>÷<EFBFBD><EFBFBD><EFBFBD>ʱתȥ<EFBFBD><EFBFBD>Ⲣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>źš<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
lang=EN-US> .align 2</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
lang=EN-US> _timer_interrupt:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push
%ds&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# save ds,es and put kernel data space</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push
%es&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# into them. %fs is used by _system_call</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %fs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ds</span><EFBFBD><EFBFBD><span lang=EN-US>es</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD><span
lang=EN-US>fs</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>system_call</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
$-1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# fill in -1 for orig_eax&nbsp; # </span><EFBFBD><EFBFBD><span lang=EN-US>-1</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DZ<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>eax</span><EFBFBD><EFBFBD><span lang=EN-US>ecx</span><EFBFBD><EFBFBD><span lang=EN-US>edx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>gcc</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڵ<EFBFBD><EFBFBD>ú<EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>ᱣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ</p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>ebx</span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>ret_from_sys_call</span><EFBFBD>л<EFBFBD><EFBFBD>õ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
%edx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# we save %eax,%ecx,%edx as gcc doesn't</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
%ecx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# save those across function calls. %ebx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl
%ebx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# is saved as we use that in ret_sys_call</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x10,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# ds,es</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x17,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# fs</span><EFBFBD><EFBFBD>Ϊָ<EFBFBD><EFBFBD>ֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; incl _jiffies</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ڳ<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>жϿ<EFBFBD><EFBFBD><EFBFBD>оƬʱû<EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><span
lang=EN-US>EOI</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movb
$0x20,%al&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;#
EOI to interrupt controller #1</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; outb %al,$0x20</span></p>
<p class=a><span lang=EN-US>&nbsp;</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӷ<EFBFBD>ջ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD>ϵͳ<EFBFBD><EFBFBD><EFBFBD>ô<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>CS</span><EFBFBD>μĴ<EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD>еĵ<EFBFBD>ǰ<EFBFBD><EFBFBD>Ȩ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>(0</span><EFBFBD><EFBFBD><span lang=EN-US>3)</span><EFBFBD><EFBFBD>ѹ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span lang=EN-US>do_timer</span><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>do_timer()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ִ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>л<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD>ȹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>kernel/sched.c</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # 324</span><EFBFBD><EFBFBD>ʵ<EFBFBD>֡<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl CS(%esp),%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; andl
$3,%eax&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
%eax is CPL (0 or 3, 0=supervisor)</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call
_do_timer&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
'do_timer(long CPL)' does everything from</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; addl $4,%esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;# task switching to accounting ...</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jmp
ret_from_sys_call</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US style='color:blue'>&nbsp;</span><span lang=EN-US>&nbsp;&nbsp;
#### </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>sys_execve()</span>ϵͳ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD>ȡ<EFBFBD>жϵ<EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>do_execve()</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # do_execve()</span><EFBFBD><EFBFBD><span
lang=EN-US>fs/exec.c</span><EFBFBD><EFBFBD><span lang=EN-US>207</span><EFBFBD>С<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
lang=EN-US> .align 2</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
lang=EN-US> _sys_execve:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; lea EIP(%esp),%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;# eax</span>ָ<EFBFBD><EFBFBD><EFBFBD>ջ<EFBFBD>б<EFBFBD><EFBFBD><EFBFBD><EFBFBD>û<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eip</span>ָ<EFBFBD>봦<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call _do_execve</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; addl $4,%esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱѹ<EFBFBD><EFBFBD>ջ<EFBFBD><EFBFBD><span lang=EN-US>EIP</span>ֵ<EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ret</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### sys_fork()</span><EFBFBD><EFBFBD><EFBFBD>ã<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӽ<EFBFBD><EFBFBD>̣<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>system_call</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>2</span><EFBFBD><EFBFBD>ԭ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>include/linux/sys.h</span><EFBFBD>С<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ȵ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>find_empty_process()</span><EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>̺<EFBFBD><span lang=EN-US>last_pid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>Ŀǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>copy_process()</span><EFBFBD><EFBFBD><EFBFBD>ƽ<EFBFBD><EFBFBD>̡<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
lang=EN-US> .align 2</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
lang=EN-US> _sys_fork:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call
_find_empty_process&nbsp;&nbsp; # </span>Ϊ<EFBFBD>½<EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD>ý<EFBFBD><EFBFBD>̺<EFBFBD><span lang=EN-US>last_pid</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>kernel/fork.c</span><EFBFBD><EFBFBD><span lang=EN-US>143</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testl %eax,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><span lang=EN-US>eax</span><EFBFBD>з<EFBFBD><EFBFBD>ؽ<EFBFBD><EFBFBD>̺š<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ظ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; js 1f</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %gs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %esi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edi</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ebp</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call _copy_process&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>copy_process()</span><EFBFBD><EFBFBD><span
lang=EN-US>kernel/fork.c</span><EFBFBD><EFBFBD><span lang=EN-US>68</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; addl $20,%esp&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ѹջ<EFBFBD><EFBFBD><EFBFBD>ݡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
lang=EN-US> 1:&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;ret</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int 46 -- (int 0x2E) </span>Ӳ<EFBFBD><EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӦӲ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>IRQ14</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD>̲<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɻ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͻᷢ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD>źš<EFBFBD><span
lang=EN-US>(</span><EFBFBD>μ<EFBFBD><span lang=EN-US>kernel/blk_drv/hd.c)</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8259A</span><EFBFBD>жϿ<EFBFBD><EFBFBD>ƴ<EFBFBD>оƬ<EFBFBD><EFBFBD><EFBFBD>ͽ<EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>(EOI)</span><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>do_hd</span><EFBFBD>еĺ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>edx</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>do_hd</span>Ϊ<span lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span lang=EN-US>edx</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD>ա<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>edx</span><EFBFBD><EFBFBD>ֵָ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # unexpected_hd_interrupt()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8259A</span><EFBFBD><EFBFBD>оƬ<EFBFBD><EFBFBD><span lang=EN-US>EOI</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>edx</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span>ָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>: read_intr()</span><EFBFBD><EFBFBD><span lang=EN-US>write_intr()</span><EFBFBD><EFBFBD><span
lang=EN-US>unexpected_hd_interrupt()</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
lang=EN-US> _hd_interrupt:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x10,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# ds,es</span><EFBFBD><EFBFBD>Ϊ<EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x17,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# fs</span><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD>ľֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%fs</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>ڳ<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>жϿ<EFBFBD><EFBFBD><EFBFBD>оƬʱû<EFBFBD>в<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Զ<EFBFBD><span
lang=EN-US>EOI</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;movb $0x20,%al</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; outb
%al,$0xA0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;#
EOI to interrupt controller #1 # </span><EFBFBD>ʹ<EFBFBD><span
lang=EN-US>8259A</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jmp 1f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;# give port chance to breathe&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>jmp</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
lang=EN-US> 1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jmp 1f</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # do_hd</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<span
lang=EN-US>read_intr()</span><EFBFBD><EFBFBD><span lang=EN-US>write_intr()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><span
lang=EN-US>edx</span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>ͽ<EFBFBD><span lang=EN-US>do_hd</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>NULL</span><EFBFBD><EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Եõ<EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>Ϊ<EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>C</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>unexpected_hd_interrupt()</span><EFBFBD><EFBFBD><EFBFBD>Դ<EFBFBD><EFBFBD><EFBFBD>δ֪Ӳ<EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
lang=EN-US> 1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xorl %edx,%edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
%edx,_hd_timeout&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # hd_timeout</span><EFBFBD><EFBFBD>Ϊ<span
lang=EN-US>0</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ڹ涨ʱ<EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xchgl _do_hd,%edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testl %edx,%edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne 1f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;# </span><EFBFBD><EFBFBD><EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>unexpected_hd_interrupt()</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
$_unexpected_hd_interrupt,%edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>257</span></u><span
lang=EN-US> 1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; outb %al,$0x20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><span
lang=EN-US>8259A</span><EFBFBD><EFBFBD>оƬ<span lang=EN-US>EOI</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call
*%edx&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;#
&quot;interesting&quot; way of handling intr.</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %fs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD>Ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>do_hd</span>ָ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>265</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iret</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>266</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int38 -- (int 0x26) </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӦӲ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>IRQ6</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>䴦<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD>̵Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>kernel/blk_drv/floppy.c</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8259A</span><EFBFBD>жϿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>оƬ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>EOI</span>ָ<EFBFBD>Ȼ<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>do_floppy</span><EFBFBD>еĺ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>eax</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>do_floppy</span>Ϊ<span lang=EN-US>NULL</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><span lang=EN-US>eax</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD>ա<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>eax</span><EFBFBD><EFBFBD>ֵָ<EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # unexpected_floppy_interrupt ()</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>eax</span>ָ<EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>: rw_interrupt,</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #
seek_interrupt,recal_interrupt,reset_interrupt</span><EFBFBD><EFBFBD><span lang=EN-US>unexpected_floppy_interrupt</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>267</span></u><span
lang=EN-US> _floppy_interrupt:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>268</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; push %fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x10,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# ds,es</span><EFBFBD><EFBFBD>Ϊ<EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl $0x17,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# fs</span><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD><EFBFBD>ó<EFBFBD><EFBFBD><EFBFBD>ľֲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݶΡ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>278</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; mov %ax,%fs</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>279</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movb $0x20,%al&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>8259A</span><EFBFBD>жϿ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>EOI</span>ָ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ӳ<EFBFBD><EFBFBD><EFBFBD>жϣ<EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;outb
%al,$0x20&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;#
EOI to interrupt controller #1</span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp; &nbsp;# do_floppy</span>Ϊһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>룬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵʵ<EFBFBD>ʴ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD>롣<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>ڱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ŵ<EFBFBD><span lang=EN-US>eax</span><EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͽ<EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # do_floppy</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ÿա<EFBFBD>Ȼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>eax</span><EFBFBD><EFBFBD>ԭָ<EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>Ϊ<EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # unexpected_floppy_interrupt()</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xorl %eax,%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; xchgl _do_floppy,%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; testl %eax,%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
# </span><EFBFBD><EFBFBD><EFBFBD>Ժ<EFBFBD><EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD><span lang=EN-US>=NULL?</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>284</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; jne 1f&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>գ<EFBFBD><EFBFBD><EFBFBD>ʹָ<EFBFBD><EFBFBD>ָ<EFBFBD><EFBFBD><span lang=EN-US>C</span><EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>unexpected_floppy_interrupt()</span><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movl
$_unexpected_floppy_interrupt,%eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>286</span></u><span
lang=EN-US> 1:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; call
*%eax&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;#
&quot;interesting&quot; way of handling intr. &nbsp;&nbsp;# </span><EFBFBD><EFBFBD>ӵ<EFBFBD><EFBFBD>á<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %fs&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;# </span><EFBFBD>Ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><span lang=EN-US>do_floppy</span>ָ<EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>288</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %es</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>289</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pop %ds</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>290</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %edx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %ecx</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iret</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>294</span></u><span
lang=EN-US> </span></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; #### int 39 -- (int 0x27) </span><EFBFBD><EFBFBD><EFBFBD>п<EFBFBD><EFBFBD>жϴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>򣬶<EFBFBD>ӦӲ<EFBFBD><EFBFBD><EFBFBD>ж<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><span
lang=EN-US>IRQ7</span><EFBFBD><EFBFBD></p>
<p class=a><span lang=EN-US>&nbsp;&nbsp;&nbsp; # </span><EFBFBD><EFBFBD><EFBFBD>汾<EFBFBD>ں˻<EFBFBD>δʵ<EFBFBD>֡<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֻ<EFBFBD>Ƿ<EFBFBD><EFBFBD><EFBFBD><span
lang=EN-US>EOI</span>ָ<EFBFBD></p>
<p class=a><u><span lang=EN-US style='color:blue'>295</span></u><span
lang=EN-US> _parallel_interrupt:</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>296</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; pushl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; movb $0x20,%al</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>298</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; outb %al,$0x20</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>299</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; popl %eax</span></p>
<p class=a><u><span lang=EN-US style='color:blue'>300</span></u><span
lang=EN-US>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; iret</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>
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