3257 lines
124 KiB
HTML
3257 lines
124 KiB
HTML
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|
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|
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||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
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|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320605"><span style='font-family:黑体'>程序</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> <u><span style='color:blue'>1</span></u> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u>
|
||
* linux/kernel/system_call.s</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u>
|
||
*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u>
|
||
* (C) 1991 Linus Torvalds</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u>
|
||
* system_call.s contains the system-call low-level handling
|
||
routines.</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u>
|
||
* This also contains the timer-interrupt handler, as some of the code is</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u>
|
||
* the same. The hd- and flopppy-interrupts are also here.</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u>
|
||
*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u>
|
||
* NOTE: This code handles signal-recognition, which happens every time</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u>
|
||
* after a timer-interrupt and after each system call. Ordinary interrupts</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u>
|
||
* don't handle signal-recognition, as that would clutter them up totally</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u>
|
||
* unnecessarily.</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u>
|
||
*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u>
|
||
* Stack layout in 'ret_from_system_call':</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u>
|
||
*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u>
|
||
* 0(%esp) - %eax</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u>
|
||
* 4(%esp) - %ebx</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
* 8(%esp) - %ecx</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
* C(%esp) - %edx</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u>
|
||
* 10(%esp) - original
|
||
%eax (-1 if not system call)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u>
|
||
* 14(%esp) - %fs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u>
|
||
* 18(%esp) - %es</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
* 1C(%esp) - %ds</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
* 20(%esp) - %eip</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u>
|
||
* 24(%esp) - %cs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
* 28(%esp) - %eflags</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
* 2C(%esp) - %oldesp</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u>
|
||
* 30(%esp) - %oldss</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * system_call.s</span>文件包含系统调用（<span
|
||
lang=EN-US>system-call</span>）底层处理子程序。由于有些代码比较类似，</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>所以同时也包括时钟中断处理（<span
|
||
lang=EN-US>timer-interrupt</span>）句柄。硬盘和软盘的中断处理程序也在这里。</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>注意：这段代码处理信号（<span
|
||
lang=EN-US>signal</span>）识别，在每次时钟中断和系统调用之后都会进行识别。一般</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>中断过程并不处理信号识别，因为会给系统造成混乱。</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>从系统调用返回（<span
|
||
lang=EN-US>'ret_from_system_call'</span>）时堆栈的内容见上面<span lang=EN-US>19-30</span>行。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>上面<span lang=EN-US>Linus</span>原注释中一般中断过程是指除了系统调用中断（<span
|
||
lang=EN-US>int 0x80</span>）和时钟中断（<span lang=EN-US>int 0x20</span>）</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>以外的其他中断。这些中断会在内核态或用户态随机发生，若在这些中断过程中也处理信号识别</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>的话，就有可能与系统调用中断和时钟中断过程中对信号的识别处理过程相冲突，，违反了内核</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>代码非抢占原则。因此系统既无必要在这些“其他”中断中处理信号，也不允许这样做。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u>
|
||
SIG_CHLD = 17
|
||
# </span>定义<span lang=EN-US>SIG_CHLD</span>信号（子进程停止或结束）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u>
|
||
EAX =
|
||
0x00 # </span>堆栈中各个寄存器的偏移位置。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u>
|
||
EBX = 0x04</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u>
|
||
ECX =
|
||
0x08</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u>
|
||
EDX =
|
||
0x0C</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
ORIG_EAX = 0x10
|
||
# </span>如果不是系统调用（是其它中断）时，该值为<span lang=EN-US>-1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u>
|
||
FS
|
||
= 0x14</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u>
|
||
ES
|
||
= 0x18</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u>
|
||
DS
|
||
= 0x1C</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
EIP =
|
||
0x20 #
|
||
44 -- 48</span>行 由<span lang=EN-US>CPU</span>自动入栈。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
CS
|
||
= 0x24</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u>
|
||
EFLAGS = 0x28</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u>
|
||
OLDESP = 0x2C # </span>当特权级变化时，原堆栈指针也会入栈。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
OLDSS = 0x30</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>以下这些是任务结构（<span
|
||
lang=EN-US>task_struct</span>）中变量的偏移值，参见<span lang=EN-US>include/linux/sched.h</span>，<span
|
||
lang=EN-US>105</span>行开始。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
state =
|
||
0 #
|
||
these are offsets into the task-struct. # </span>进程状态码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
counter = 4
|
||
# </span>任务运行时间计数<span lang=EN-US>(</span>递减<span lang=EN-US>)</span>（滴答数），运行时间片。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u>
|
||
priority = 8 #
|
||
</span>运行优先数。任务开始运行时<span lang=EN-US>counter=priority</span>，越大则运行时间越长。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
signal = 12
|
||
# </span>是信号位图，每个比特位代表一种信号，信号值<span lang=EN-US>=</span>位偏移值<span lang=EN-US>+1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u>
|
||
sigaction = 16 # MUST be
|
||
16 (=len of sigaction) # sigaction</span>结构长度必须是<span lang=EN-US>16</span>字节。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
blocked = (33*16) # </span>受阻塞信号位图的偏移量。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>以下定义在<span lang=EN-US>sigaction</span>结构中的偏移量，参见<span
|
||
lang=EN-US>include/signal.h</span>，第<span lang=EN-US>55</span>行开始。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u> #
|
||
offsets within sigaction</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
sa_handler = 0 #
|
||
</span>信号处理过程的句柄（描述符）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
sa_mask = 4
|
||
# </span>信号屏蔽码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
sa_flags = 8 #
|
||
</span>信号集。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
sa_restorer = 12 #
|
||
</span>恢复函数指针，参见<span lang=EN-US>kernel/signal.c</span>程序说明。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u>
|
||
nr_system_calls = 82 #
|
||
Linux 0.12</span>版内核中的系统调用总数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u>
|
||
ENOSYS = 38
|
||
# </span>系统调用号出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u>
|
||
* Ok, I get parallel printer interrupts while using the floppy for some</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
* strange reason. Urgel. Now I just ignore them.</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>好了，在使用软驱时我收到了并行打印机中断，很奇怪。呵，现在不管它。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <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> <u><span style='color:blue'>72</span></u>
|
||
.globl _hd_interrupt,_floppy_interrupt,_parallel_interrupt</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u>
|
||
.globl _device_not_available, _coprocessor_error</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>系统调用号错误时将返回出错码<span
|
||
lang=EN-US>-ENOSYS</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u>
|
||
.align 2 #
|
||
</span>内存<span lang=EN-US>4</span>字节对齐。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
bad_sys_call:</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u>
|
||
pushl $-ENOSYS #
|
||
eax</span>中置<span lang=EN-US>-ENOSYS</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
jmp ret_from_sys_call</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>重新执行调度程序入口。调度程序<span
|
||
lang=EN-US>schedule()</span>在（<span lang=EN-US>kernel/sched.c</span>，<span
|
||
lang=EN-US>119</span>行处开始。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>当调度程序<span lang=EN-US>schedule()</span>返回时就从<span
|
||
lang=EN-US>ret_from_sys_call</span>处（<span lang=EN-US>107</span>行）继续执行。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
.align 2</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
reschedule:</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
pushl $ret_from_sys_call # </span>将<span lang=EN-US>ret_from_sys_call</span>的地址入栈（<span
|
||
lang=EN-US>107</span>行）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
jmp _schedule</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> #### int 0x80 --linux</span>系统调用入口点（调用中断<span
|
||
lang=EN-US>int 0x80</span>，<span lang=EN-US>eax</span>中是调用号）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
.align 2</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
_system_call:</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
push %ds
|
||
# </span>保存原段寄存器值。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
push %es</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
push %fs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
pushl
|
||
%eax
|
||
# save the orig_eax # </span>保存<span lang=EN-US>eax</span>原值。</p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>一个系统调用最多可带有<span
|
||
lang=EN-US>3</span>个参数，也可以不带参数。下面入栈的<span lang=EN-US>ebx</span>、<span
|
||
lang=EN-US>ecx</span>和<span lang=EN-US>edx</span>中放着系统</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>调用相应<span lang=EN-US>C</span>语言函数（见第<span
|
||
lang=EN-US>99</span>行）的调用参数。这几个寄存器入栈的顺序是由<span lang=EN-US>GNU gcc</span>规定的，</p>
|
||
|
||
<p class=a><span lang=EN-US> # ebx</span>中可存放第<span
|
||
lang=EN-US>1</span>个参数，<span lang=EN-US>ecx</span>中存放第<span lang=EN-US>2</span>个参数，<span
|
||
lang=EN-US>edx</span>中存放第<span lang=EN-US>3</span>个参数。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>系统调用语句可参见头文件<span
|
||
lang=EN-US>include/unistd.h</span>中第<span lang=EN-US>150</span>到<span
|
||
lang=EN-US>200</span>行的系统调用宏。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
pushl
|
||
%edx
|
||
</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
pushl
|
||
%ecx
|
||
# push %ebx,%ecx,%edx as parameters</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
pushl %ebx #
|
||
to the system call</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>在保存过段寄存器之后，让<span
|
||
lang=EN-US>ds,es</span>指向内核数据段，而<span lang=EN-US>fs</span>指向当前局部数据段，即指向执行本</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>次系统调用的用户程序的数据段。注意，在<span
|
||
lang=EN-US>Linux 0.12</span>中内核给任务分配的代码和数据内存段</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>是重叠的，它们的段基址和段限长相同。参见<span
|
||
lang=EN-US>fork.c</span>程序中<span lang=EN-US>copy_mem()</span>函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
movl $0x10,%edx #
|
||
set up ds,es to kernel space</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u>
|
||
mov %dx,%ds</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u>
|
||
mov %dx,%es</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u>
|
||
movl $0x17,%edx #
|
||
fs points to local data space</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u>
|
||
mov %dx,%fs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u>
|
||
cmpl _NR_syscalls,%eax # </span>调用号如果超出范围的话就跳转。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
jae bad_sys_call</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>下面这句操作数的含义是：调用地址<span
|
||
lang=EN-US>=[_sys_call_table + %eax * 4]</span>。参见程序后的说明。</p>
|
||
|
||
<p class=a><span lang=EN-US> # sys_call_table[]</span>是一个指针数组，定义在<span
|
||
lang=EN-US>include/linux/sys.h</span>中，该数组中设置了内核</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>所有<span lang=EN-US>82</span>个系统调用<span
|
||
lang=EN-US>C</span>处理函数的地址。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u>
|
||
call _sys_call_table(,%eax,4) # </span>间接调用指定功能<span lang=EN-US>C</span>函数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US> pushl %eax
|
||
# </span>把系统调用返回值入栈。</p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>下面<span lang=EN-US>101-106</span>行查看当前任务的运行状态。如果不在就绪状态（<span
|
||
lang=EN-US>state</span>不等于<span lang=EN-US>0</span>）就去执行调度</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>程序。如果该任务在就绪状态，但是其时间片已经用完（<span
|
||
lang=EN-US>counter=0</span>），则也去执行调度程序。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>例如当后台进程组中的进程执行控制终端读写操作时，那么默认条件下该后台进程组所有进程</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>会收到<span lang=EN-US>SIGTTIN</span>或<span
|
||
lang=EN-US>SIGTTOU</span>信号，导致进程组中所有进程处于停止状态。而当前进程则会立刻</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>返回。</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> movl _current,%eax
|
||
# </span>取当前任务（进程）数据结构指针<span lang=EN-US style='font-family:
|
||
Wingdings'>è</span><span lang=EN-US>eax</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> cmpl
|
||
$0,state(%eax) # state</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US> jne reschedule</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US> cmpl
|
||
$0,counter(%eax) # counter</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> je reschedule</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>以下这段代码执行从系统调用<span
|
||
lang=EN-US>C</span>函数返回后，对信号进行识别处理。其他中断服务程序退出时也</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>将跳转到这里进行处理后才退出中断过程，例如后面<span
|
||
lang=EN-US>131</span>行上的处理器出错中断<span lang=EN-US>int 16</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>首先判别当前任务是否是初始任务<span
|
||
lang=EN-US>task0</span>，如果是则不必对其进行信号量方面的处理，直接返回。</p>
|
||
|
||
<p class=a><span lang=EN-US> # 109</span>行上的<span lang=EN-US>_task</span>对应<span
|
||
lang=EN-US>C</span>程序中的<span lang=EN-US>task[]</span>数组，直接引用<span lang=EN-US>task</span>相当于引用<span
|
||
lang=EN-US>task[0]</span>。</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> movl _current,%eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> cmpl
|
||
_task,%eax #
|
||
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> je 3f # </span>向前<span lang=EN-US>(forward)</span>跳转到标号<span
|
||
lang=EN-US>3</span>处退出中断处理。</p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>通过对原调用程序代码选择符的检查来判断调用程序是否是用户任务。如果不是则直接退出中断。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>这是因为任务在内核态执行时不可抢占。否则对任务进行信号量的识别处理。这里比较选择符是</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>否为用户代码段的选择符 <span
|
||
lang=EN-US>0x000f</span>（<span
|
||
lang=EN-US>RPL=3</span>，局部表，代码段）来判断是否为用户任务。如果不是</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>则说明是某个中断服务程序（例如中断<span
|
||
lang=EN-US>16</span>）跳转到第<span lang=EN-US>107</span>行执行到此，于是跳转退出中断程序。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>另外，如果原堆栈段选择符不为<span
|
||
lang=EN-US>0x17</span>（即原堆栈不在用户段中），也说明本次系统调用的调用者</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>不是用户任务，则也退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> cmpw $0x0f,CS(%esp) # 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> jne 3f</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> cmpw
|
||
$0x17,OLDSS(%esp) # was stack segment = 0x17 ?</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> jne 3f</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>下面这段代码（<span
|
||
lang=EN-US>115-128</span>）用于处理当前任务中的信号。首先取当前任务结构中的信号位图（<span lang=EN-US>32</span>位，</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>每位代表<span lang=EN-US>1</span>种信号），然后用任务结构中的信号阻塞（屏蔽）码，阻塞不允许的信号位，取得数值</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>最小的信号值，再把原信号位图中该信号对应的位复位（置<span
|
||
lang=EN-US>0</span>），最后将该信号值作为参数之一调</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>用<span lang=EN-US>do_signal()</span>。<span
|
||
lang=EN-US>do_signal()</span>在（<span lang=EN-US>kernel/signal.c,128</span>）中，其参数包括<span
|
||
lang=EN-US>13</span>个入栈的信息。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>在<span lang=EN-US>do_signal()</span>或信号处理函数返回之后，若返回值不为<span
|
||
lang=EN-US>0</span>则再看看是否需要切换进程或继续处理</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>其它信号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US> movl
|
||
signal(%eax),%ebx # </span>取信号位图<span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>ebx</span>，每<span
|
||
lang=EN-US>1</span>位代表<span lang=EN-US>1</span>种信号，共<span lang=EN-US>32</span>个信号。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US> movl
|
||
blocked(%eax),%ecx # </span>取阻塞（屏蔽）信号位图<span lang=EN-US
|
||
style='font-family:Wingdings'>è</span><span lang=EN-US>ecx</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> notl %ecx
|
||
# </span>每位取反。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> andl %ebx,%ecx
|
||
# </span>获得许可的信号位图。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> bsfl %ecx,%ecx
|
||
# </span>从低位（位<span lang=EN-US>0</span>）开始扫描位图，看是否有<span lang=EN-US>1</span>的位，</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
# </span>若有，则<span lang=EN-US>ecx</span>保留该位的偏移值（即第几位<span lang=EN-US>0--31</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> je 3f # </span>如果没有信号则向前跳转退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> btrl %ecx,%ebx
|
||
# </span>复位该信号（<span lang=EN-US>ebx</span>含有原<span lang=EN-US>signal</span>位图）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> movl
|
||
%ebx,signal(%eax) # </span>重新保存<span lang=EN-US>signal</span>位图信息<span
|
||
lang=EN-US style='font-family:Wingdings'>è</span><span lang=EN-US>current->signal</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> incl %ecx
|
||
# </span>将信号调整为从<span lang=EN-US>1</span>开始的数（<span lang=EN-US>1--32</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> pushl %ecx
|
||
# </span>信号值入栈作为调用<span lang=EN-US>do_signal</span>的参数之一。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> call _do_signal
|
||
# </span>调用<span lang=EN-US>C</span>函数信号处理程序（<span lang=EN-US>kernel/signal.c</span>，<span
|
||
lang=EN-US>128</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> popl %ecx
|
||
# </span>弹出入栈的信号值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> testl %eax, %eax
|
||
# </span>测试返回值，若不为<span lang=EN-US>0</span>则跳转到前面标号<span lang=EN-US>2</span>（<span
|
||
lang=EN-US>101</span>行）处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US> jne
|
||
2b #
|
||
see if we need to switch tasks, or do more signals</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> 3: popl %eax
|
||
# eax</span>中含有第<span lang=EN-US>100</span>行入栈的系统调用返回值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> popl %ebx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> popl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> popl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> addl $4,
|
||
%esp #
|
||
skip orig_eax # </span>跳过（丢弃）原<span lang=EN-US>eax</span>值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> pop %fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US> pop %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US> pop %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> 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> #### int16 -- </span>处理器错误中断。<span
|
||
lang=EN-US> </span>类型：错误；无错误码。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>这是一个外部的基于硬件的异常。当协处理器检测到自己发生错误时，就会通过<span
|
||
lang=EN-US>ERROR</span>引脚</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>通知<span lang=EN-US>CPU</span>。下面代码用于处理协处理器发出的出错信号。并跳转去执行<span
|
||
lang=EN-US>C</span>函数<span lang=EN-US>math_error()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>（<span lang=EN-US>kernel/math/error.c
|
||
11</span>）。返回后将跳转到标号<span lang=EN-US>ret_from_sys_call</span>处继续执行。</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> push %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US> push %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US> push %fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US> pushl
|
||
$-1
|
||
# fill in -1 for orig_eax # </span>填<span
|
||
lang=EN-US>-1</span>，表明不是系统调用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US> pushl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US> pushl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US> pushl %ebx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US> movl $0x10,%eax
|
||
# ds,es</span>置为指向内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> mov %ax,%ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US> mov %ax,%es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US> movl $0x17,%eax
|
||
# fs</span>置为指向局部数据段（出错程序的数据段）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US> mov %ax,%fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> pushl
|
||
$ret_from_sys_call # </span>把下面调用返回的地址入栈。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US> jmp _math_error
|
||
# </span>执行<span lang=EN-US>math_error()</span>（<span lang=EN-US>kernel/math/error.c</span>，<span
|
||
lang=EN-US>11</span>）。</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> #### int7 -- </span>设备不存在或协处理器不存在。<span
|
||
lang=EN-US> </span>类型：错误；无错误码。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>如果控制寄存器 <span
|
||
lang=EN-US>CR0 </span>中<span lang=EN-US>EM</span>（模拟）标志置位，则当<span lang=EN-US>CPU
|
||
</span>执行一个协处理器指令时就会引发该</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>中断，这样<span lang=EN-US>CPU</span>就可以有机会让这个中断处理程序模拟协处理器指令（<span
|
||
lang=EN-US>181</span>行）。</p>
|
||
|
||
<p class=a><span lang=EN-US> # CR0</span>的交换标志<span
|
||
lang=EN-US>TS</span>是在<span lang=EN-US> CPU</span>执行任务转换时设置的。<span lang=EN-US>TS
|
||
</span>可以用来确定什么时候协处理器中的</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>内容与<span lang=EN-US>CPU
|
||
</span>正在执行的任务不匹配了。当<span lang=EN-US>CPU </span>在运行一个协处理器转义指令时发现<span
|
||
lang=EN-US>TS</span>置位时，</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>就会引发该中断。此时就可以保存前一个任务的协处理器内容，并恢复新任务的协处理器执行</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>状态（<span lang=EN-US>176</span>行）。参见<span
|
||
lang=EN-US>kernel/sched.c</span>，<span lang=EN-US>92</span>行。该中断最后将转移到标号<span
|
||
lang=EN-US>ret_from_sys_call</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>处执行下去（检测并处理信号）。</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> push %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US> push %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US> push %fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US> pushl
|
||
$-1
|
||
# fill in -1 for orig_eax # </span>填<span lang=EN-US>-1</span>，表明不是系统调用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US> pushl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US> pushl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US> pushl %ebx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> movl $0x10,%eax
|
||
# ds,es</span>置为指向内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US> mov %ax,%ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US> mov %ax,%es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US> movl $0x17,%eax
|
||
# fs</span>置为指向局部数据段（出错程序的数据段）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> mov %ax,%fs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>清<span lang=EN-US>CR0</span>中任务已交换标志<span
|
||
lang=EN-US>TS</span>，并取<span lang=EN-US>CR0</span>值。若其中协处理器仿真标志<span
|
||
lang=EN-US>EM</span>没有置位，说明不是</p>
|
||
|
||
<p class=a><span lang=EN-US> # EM</span>引起的中断，则恢复任务协处理器状态，执行<span
|
||
lang=EN-US>C</span>函数 <span lang=EN-US>math_state_restore()</span>，并在返回时</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>去执行<span lang=EN-US>ret_from_sys_call</span>处的代码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> pushl
|
||
$ret_from_sys_call # </span>把下面跳转或调用的返回地址入栈。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US>
|
||
clts
|
||
# 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> movl %cr0,%eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> testl
|
||
$0x4,%eax #
|
||
EM (math emulation bit)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> je
|
||
_math_state_restore # </span>执行<span lang=EN-US>math_state_restore()</span>（<span
|
||
lang=EN-US>kernel/sched.c</span>，<span lang=EN-US>92</span>行）。</p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>若<span lang=EN-US>EM</span>标志置位，则去执行数学仿真程序<span
|
||
lang=EN-US>math_emulate()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> pushl %ebp</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US> pushl %esi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> pushl %edi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US> pushl
|
||
$0 #
|
||
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> call _math_emulate
|
||
# </span>调用<span lang=EN-US>C</span>函数（<span
|
||
lang=EN-US>math/math_emulate.c</span>，<span lang=EN-US>476</span>行）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US> addl $4,%esp
|
||
# </span>丢弃临时存储。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> popl %edi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> popl %esi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> popl %ebp</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> ret
|
||
# </span>这里的<span lang=EN-US>ret</span>将跳转到<span lang=EN-US>ret_from_sys_call(107</span>行<span
|
||
lang=EN-US>)</span>。</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> #### int32 -- (int 0x20) </span>时钟中断处理程序。中断频率设置为<span
|
||
lang=EN-US>100Hz(include/linux/sched.h,4)</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>定时芯片<span lang=EN-US>8253/8254</span>是在<span
|
||
lang=EN-US>(kernel/sched.c,438)</span>处初始化的。因此这里<span lang=EN-US>jiffies</span>每<span
|
||
lang=EN-US>10</span>毫秒加<span lang=EN-US>1</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>这段代码将<span lang=EN-US>jiffies</span>增<span
|
||
lang=EN-US>1</span>，发送结束中断指令给<span lang=EN-US>8259</span>控制器，然后用当前特权级作为参数调用</p>
|
||
|
||
<p class=a><span lang=EN-US> # C</span>函数<span lang=EN-US>do_timer(long
|
||
CPL)</span>。当调用返回时转去检测并处理信号。</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> push
|
||
%ds
|
||
# 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> push
|
||
%es
|
||
# 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> push %fs
|
||
# </span>保存<span lang=EN-US>ds</span>、<span lang=EN-US>es</span>并让其指向内核数据段。<span
|
||
lang=EN-US>fs</span>将用于<span lang=EN-US>system_call</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US> pushl
|
||
$-1
|
||
# fill in -1 for orig_eax # </span>填<span lang=EN-US>-1</span>，表明不是系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>下面我们保存寄存器<span
|
||
lang=EN-US>eax</span>、<span lang=EN-US>ecx</span>和<span lang=EN-US>edx</span>。这是因为<span
|
||
lang=EN-US>gcc</span>编译器在调用函数时不会保存它们。这里也</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>保存了<span lang=EN-US>ebx</span>寄存器，因为在后面<span
|
||
lang=EN-US>ret_from_sys_call</span>中会用到它。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US> pushl
|
||
%edx
|
||
# 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> pushl
|
||
%ecx
|
||
# 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> pushl
|
||
%ebx
|
||
# 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> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> movl $0x10,%eax
|
||
# ds,es</span>置为指向内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> mov %ax,%ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> mov %ax,%es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> movl $0x17,%eax
|
||
# fs</span>置为指向局部数据段（程序的数据段）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> mov %ax,%fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> incl _jiffies</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>由于初始化中断控制芯片时没有采用自动<span
|
||
lang=EN-US>EOI</span>，所以这里需要发指令结束该硬件中断。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> movb
|
||
$0x20,%al #
|
||
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> outb %al,$0x20</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>下面从堆栈中取出执行系统调用代码的选择符（<span
|
||
lang=EN-US>CS</span>段寄存器值）中的当前特权级别<span lang=EN-US>(0</span>或<span lang=EN-US>3)</span>并压入</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>堆栈，作为<span lang=EN-US>do_timer</span>的参数。<span
|
||
lang=EN-US>do_timer()</span>函数执行任务切换、计时等工作，在<span lang=EN-US>kernel/sched.c</span>，</p>
|
||
|
||
<p class=a><span lang=EN-US> # 324</span>行实现。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> movl CS(%esp),%eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> andl
|
||
$3,%eax #
|
||
%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> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> call
|
||
_do_timer #
|
||
'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> addl $4,%esp
|
||
# task switching to accounting ...</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> 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'> </span><span lang=EN-US>
|
||
#### </span>这是<span lang=EN-US>sys_execve()</span>系统调用。取中断调用程序的代码指针作为参数调用<span
|
||
lang=EN-US>C</span>函数<span lang=EN-US>do_execve()</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # do_execve()</span>在<span
|
||
lang=EN-US>fs/exec.c</span>，<span lang=EN-US>207</span>行。</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> lea EIP(%esp),%eax
|
||
# eax</span>指向堆栈中保存用户程序<span lang=EN-US>eip</span>指针处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> call _do_execve</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> addl $4,%esp
|
||
# </span>丢弃调用时压入栈的<span lang=EN-US>EIP</span>值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US> 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> #### sys_fork()</span>调用，用于创建子进程，是<span
|
||
lang=EN-US>system_call</span>功能<span lang=EN-US>2</span>。原形在<span lang=EN-US>include/linux/sys.h</span>中。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>首先调用<span lang=EN-US>C</span>函数<span
|
||
lang=EN-US>find_empty_process()</span>，取得一个进程号<span lang=EN-US>last_pid</span>。若返回负数则说明目前任务</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>数组已满。然后调用<span
|
||
lang=EN-US>copy_process()</span>复制进程。</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> call
|
||
_find_empty_process # </span>为新进程取得进程号<span lang=EN-US>last_pid</span>。（<span
|
||
lang=EN-US>kernel/fork.c</span>，<span lang=EN-US>143</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US> testl %eax,%eax
|
||
# </span>在<span lang=EN-US>eax</span>中返回进程号。若返回负数则退出。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US> js 1f</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> push %gs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US> pushl %esi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> pushl %edi</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US> pushl %ebp</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US> call _copy_process
|
||
# </span>调用<span lang=EN-US>C</span>函数<span lang=EN-US>copy_process()</span>（<span
|
||
lang=EN-US>kernel/fork.c</span>，<span lang=EN-US>68</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US> addl $20,%esp
|
||
# </span>丢弃这里所有压栈内容。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> 1: 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> #### int 46 -- (int 0x2E) </span>硬盘中断处理程序，响应硬件中断请求<span
|
||
lang=EN-US>IRQ14</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>当请求的硬盘操作完成或出错就会发出此中断信号。<span
|
||
lang=EN-US>(</span>参见<span lang=EN-US>kernel/blk_drv/hd.c)</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>首先向<span
|
||
lang=EN-US>8259A</span>中断控制从芯片发送结束硬件中断指令<span lang=EN-US>(EOI)</span>，然后取变量<span
|
||
lang=EN-US>do_hd</span>中的函数指针放入<span lang=EN-US>edx</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>寄存器中，并置<span
|
||
lang=EN-US>do_hd</span>为<span lang=EN-US>NULL</span>，接着判断<span lang=EN-US>edx</span>函数指针是否为空。如果为空，则给<span
|
||
lang=EN-US>edx</span>赋值指向</p>
|
||
|
||
<p class=a><span lang=EN-US> # unexpected_hd_interrupt()</span>，用于显示出错信息。随后向<span
|
||
lang=EN-US>8259A</span>主芯片送<span lang=EN-US>EOI</span>指令，并调用<span lang=EN-US>edx</span>中</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>指针指向的函数<span
|
||
lang=EN-US>: read_intr()</span>、<span lang=EN-US>write_intr()</span>或<span
|
||
lang=EN-US>unexpected_hd_interrupt()</span>。</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> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US> pushl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US> pushl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US> push %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US> push %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US> push %fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US> movl $0x10,%eax
|
||
# ds,es</span>置为内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US> mov %ax,%ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US> mov %ax,%es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US> movl $0x17,%eax
|
||
# fs</span>置为调用程序的局部数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US> mov %ax,%fs</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>由于初始化中断控制芯片时没有采用自动<span
|
||
lang=EN-US>EOI</span>，所以这里需要发指令结束该硬件中断。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US> movb $0x20,%al</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US> outb
|
||
%al,$0xA0 #
|
||
EOI to interrupt controller #1 # </span>送从<span
|
||
lang=EN-US>8259A</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US> jmp 1f # give port chance to breathe
|
||
# </span>这里<span lang=EN-US>jmp</span>起延时作用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US> 1: jmp 1f</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # do_hd</span>定义为一个函数指针，将被赋值<span
|
||
lang=EN-US>read_intr()</span>或<span lang=EN-US>write_intr()</span>函数地址。放到<span
|
||
lang=EN-US>edx</span>寄存器后</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>就将<span lang=EN-US>do_hd</span>指针变量置为<span
|
||
lang=EN-US>NULL</span>。然后测试得到的函数指针，若该指针为空，则赋予该指针指向<span lang=EN-US>C</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>函数<span lang=EN-US>unexpected_hd_interrupt()</span>，以处理未知硬盘中断。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> 1: xorl %edx,%edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US> movl
|
||
%edx,_hd_timeout # hd_timeout</span>置为<span
|
||
lang=EN-US>0</span>。表示控制器已在规定时间内产生了中断。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> xchgl _do_hd,%edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US> testl %edx,%edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
|
||
lang=EN-US> jne 1f # </span>若空，则让指针指向<span lang=EN-US>C</span>函数<span
|
||
lang=EN-US>unexpected_hd_interrupt()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
|
||
lang=EN-US> 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: outb %al,$0x20
|
||
# </span>送<span
|
||
lang=EN-US>8259A</span>主芯片<span lang=EN-US>EOI</span>指令（结束硬件中断）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
|
||
lang=EN-US> call
|
||
*%edx #
|
||
"interesting" way of handling intr.</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
|
||
lang=EN-US> pop %fs
|
||
# </span>上句调用<span lang=EN-US>do_hd</span>指向的<span lang=EN-US>C</span>函数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
|
||
lang=EN-US> pop %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
|
||
lang=EN-US> pop %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
|
||
lang=EN-US> popl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
|
||
lang=EN-US> popl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
|
||
lang=EN-US> popl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>265</span></u><span
|
||
lang=EN-US> 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> #### int38 -- (int 0x26) </span>软盘驱动器中断处理程序，响应硬件中断请求<span
|
||
lang=EN-US>IRQ6</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>其处理过程与上面对硬盘的处理基本一样。（<span
|
||
lang=EN-US>kernel/blk_drv/floppy.c</span>）。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>首先向<span
|
||
lang=EN-US>8259A</span>中断控制器主芯片发送<span lang=EN-US>EOI</span>指令，然后取变量<span
|
||
lang=EN-US>do_floppy</span>中的函数指针放入<span lang=EN-US>eax</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>寄存器中，并置<span
|
||
lang=EN-US>do_floppy</span>为<span lang=EN-US>NULL</span>，接着判断<span lang=EN-US>eax</span>函数指针是否为空。如为空，则给<span
|
||
lang=EN-US>eax</span>赋值指向</p>
|
||
|
||
<p class=a><span lang=EN-US> # unexpected_floppy_interrupt ()</span>，用于显示出错信息。随后调用<span
|
||
lang=EN-US>eax</span>指向的函数<span lang=EN-US>: rw_interrupt,</span></p>
|
||
|
||
<p class=a><span lang=EN-US> #
|
||
seek_interrupt,recal_interrupt,reset_interrupt</span>或<span lang=EN-US>unexpected_floppy_interrupt</span>。</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> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
|
||
lang=EN-US> pushl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
|
||
lang=EN-US> pushl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
|
||
lang=EN-US> push %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
|
||
lang=EN-US> push %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
|
||
lang=EN-US> push %fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
|
||
lang=EN-US> movl $0x10,%eax
|
||
# ds,es</span>置为内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
|
||
lang=EN-US> mov %ax,%ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
|
||
lang=EN-US> mov %ax,%es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
|
||
lang=EN-US> movl $0x17,%eax
|
||
# fs</span>置为调用程序的局部数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>278</span></u><span
|
||
lang=EN-US> mov %ax,%fs</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>279</span></u><span
|
||
lang=EN-US> movb $0x20,%al
|
||
# </span>送主<span
|
||
lang=EN-US>8259A</span>中断控制器<span lang=EN-US>EOI</span>指令（结束硬件中断）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
|
||
lang=EN-US> outb
|
||
%al,$0x20 #
|
||
EOI to interrupt controller #1</span></p>
|
||
|
||
<p class=a><span lang=EN-US> # do_floppy</span>为一函数指针，将被赋值实际处理<span
|
||
lang=EN-US>C</span>函数指针。该指针在被交换放到<span lang=EN-US>eax</span>寄存器后就将</p>
|
||
|
||
<p class=a><span lang=EN-US> # do_floppy</span>变量置空。然后测试<span
|
||
lang=EN-US>eax</span>中原指针是否为空，若是则使指针指向<span lang=EN-US>C</span>函数</p>
|
||
|
||
<p class=a><span lang=EN-US> # unexpected_floppy_interrupt()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
|
||
lang=EN-US> xorl %eax,%eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
|
||
lang=EN-US> xchgl _do_floppy,%eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
|
||
lang=EN-US> testl %eax,%eax
|
||
# </span>测试函数指针是否<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> jne 1f # </span>若空，则使指针指向<span lang=EN-US>C</span>函数<span lang=EN-US>unexpected_floppy_interrupt()</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
|
||
lang=EN-US> 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: call
|
||
*%eax #
|
||
"interesting" way of handling intr. # </span>间接调用。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
|
||
lang=EN-US> pop %fs
|
||
# </span>上句调用<span lang=EN-US>do_floppy</span>指向的函数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>288</span></u><span
|
||
lang=EN-US> pop %es</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>289</span></u><span
|
||
lang=EN-US> pop %ds</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>290</span></u><span
|
||
lang=EN-US> popl %edx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
|
||
lang=EN-US> popl %ecx</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
|
||
lang=EN-US> popl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
|
||
lang=EN-US> 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> #### int 39 -- (int 0x27) </span>并行口中断处理程序，对应硬件中断请求信号<span
|
||
lang=EN-US>IRQ7</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> # </span>本版本内核还未实现。这里只是发送<span
|
||
lang=EN-US>EOI</span>指令。</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> pushl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
|
||
lang=EN-US> movb $0x20,%al</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>298</span></u><span
|
||
lang=EN-US> outb %al,$0x20</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>299</span></u><span
|
||
lang=EN-US> popl %eax</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>300</span></u><span
|
||
lang=EN-US> 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> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|