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<h1>copy.c</h1><a href="copy_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment">00001 <span class="comment">/* -*- linux-c -*- */</span><span class="comment"></span>
00002 <span class="comment">/** @file copy.c</span>
00003 <span class="comment"> * @brief Functions to copy from user space.</span>
00004 <span class="comment"> */</span>
00005
00006 <span class="keywordtype">long</span> <a class="code" href="copy_8c.html#a0">_stp_strncpy_from_user</a>(<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">long</span> count);
00007 <span class="comment">//static long __stp_strncpy_from_user(char *dst, const char __user *src, long count);</span>
00008
00009 <span class="preprocessor">#if defined (__i386__)</span>
00010 <span class="preprocessor"></span><span class="preprocessor">#define __stp_strncpy_from_user(dst,src,count,res) \</span>
00011 <span class="preprocessor">do { \</span>
00012 <span class="preprocessor"> int __d0, __d1, __d2; \</span>
00013 <span class="preprocessor"> __asm__ __volatile__( \</span>
00014 <span class="preprocessor"> " testl %1,%1\n" \</span>
00015 <span class="preprocessor"> " jz 2f\n" \</span>
00016 <span class="preprocessor"> "0: lodsb\n" \</span>
00017 <span class="preprocessor"> " stosb\n" \</span>
00018 <span class="preprocessor"> " testb %%al,%%al\n" \</span>
00019 <span class="preprocessor"> " jz 1f\n" \</span>
00020 <span class="preprocessor"> " decl %1\n" \</span>
00021 <span class="preprocessor"> " jnz 0b\n" \</span>
00022 <span class="preprocessor"> "1: subl %1,%0\n" \</span>
00023 <span class="preprocessor"> "2:\n" \</span>
00024 <span class="preprocessor"> ".section .fixup,\"ax\"\n" \</span>
00025 <span class="preprocessor"> "3: movl %5,%0\n" \</span>
00026 <span class="preprocessor"> " jmp 2b\n" \</span>
00027 <span class="preprocessor"> ".previous\n" \</span>
00028 <span class="preprocessor"> ".section __ex_table,\"a\"\n" \</span>
00029 <span class="preprocessor"> " .align 4\n" \</span>
00030 <span class="preprocessor"> " .long 0b,3b\n" \</span>
00031 <span class="preprocessor"> ".previous" \</span>
00032 <span class="preprocessor"> : "=d"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \</span>
00033 <span class="preprocessor"> "=&D" (__d2) \</span>
00034 <span class="preprocessor"> : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \</span>
00035 <span class="preprocessor"> : "memory"); \</span>
00036 <span class="preprocessor">} while (0)</span>
00037 <span class="preprocessor"></span><span class="preprocessor">#elif defined (__x86_64__)</span>
00038 <span class="preprocessor"></span><span class="preprocessor">#define __stp_strncpy_from_user(dst,src,count,res) \</span>
00039 <span class="preprocessor">do { \</span>
00040 <span class="preprocessor"> long __d0, __d1, __d2; \</span>
00041 <span class="preprocessor"> __asm__ __volatile__( \</span>
00042 <span class="preprocessor"> " testq %1,%1\n" \</span>
00043 <span class="preprocessor"> " jz 2f\n" \</span>
00044 <span class="preprocessor"> "0: lodsb\n" \</span>
00045 <span class="preprocessor"> " stosb\n" \</span>
00046 <span class="preprocessor"> " testb %%al,%%al\n" \</span>
00047 <span class="preprocessor"> " jz 1f\n" \</span>
00048 <span class="preprocessor"> " decq %1\n" \</span>
00049 <span class="preprocessor"> " jnz 0b\n" \</span>
00050 <span class="preprocessor"> "1: subq %1,%0\n" \</span>
00051 <span class="preprocessor"> "2:\n" \</span>
00052 <span class="preprocessor"> ".section .fixup,\"ax\"\n" \</span>
00053 <span class="preprocessor"> "3: movq %5,%0\n" \</span>
00054 <span class="preprocessor"> " jmp 2b\n" \</span>
00055 <span class="preprocessor"> ".previous\n" \</span>
00056 <span class="preprocessor"> ".section __ex_table,\"a\"\n" \</span>
00057 <span class="preprocessor"> " .align 8\n" \</span>
00058 <span class="preprocessor"> " .quad 0b,3b\n" \</span>
00059 <span class="preprocessor"> ".previous" \</span>
00060 <span class="preprocessor"> : "=r"(res), "=c"(count), "=&a" (__d0), "=&S" (__d1), \</span>
00061 <span class="preprocessor"> "=&D" (__d2) \</span>
00062 <span class="preprocessor"> : "i"(-EFAULT), "0"(count), "1"(count), "3"(src), "4"(dst) \</span>
00063 <span class="preprocessor"> : "memory"); \</span>
00064 <span class="preprocessor">} while (0)</span>
00065 <span class="preprocessor"></span><span class="preprocessor">#endif</span>
00066 <span class="preprocessor"></span><span class="comment"></span>
00067 <span class="comment">/** Copy a NULL-terminated string from userspace.</span>
00068 <span class="comment"> * On success, returns the length of the string (not including the trailing</span>
00069 <span class="comment"> * NULL).</span>
00070 <span class="comment"> *</span>
00071 <span class="comment"> * If access to userspace fails, returns -EFAULT (some data may have been</span>
00072 <span class="comment"> * copied).</span>
00073 <span class="comment"> * @param dst Destination address, in kernel space. This buffer must be at</span>
00074 <span class="comment"> * least <i>count</i> bytes long.</span>
00075 <span class="comment"> * @param src Source address, in user space.</span>
00076 <span class="comment"> * @param count Maximum number of bytes to copy, including the trailing NULL.</span>
00077 <span class="comment"> * </span>
00078 <span class="comment"> * If <i>count</i> is smaller than the length of the string, copies </span>
00079 <span class="comment"> * <i>count</i> bytes and returns <i>count</i>.</span>
00080 <span class="comment"> */</span>
00081
00082 <span class="keywordtype">long</span>
<a name="l00083"></a><a class="code" href="copy_8c.html#a0">00083</a> <a class="code" href="copy_8c.html#a0">_stp_strncpy_from_user</a>(<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">long</span> count)
00084 {
00085 <span class="keywordtype">long</span> res;
00086 __stp_strncpy_from_user(dst, src, count, res);
00087 <span class="keywordflow">return</span> res;
00088 }
00089 <span class="comment"></span>
00090 <span class="comment">/** Copy a block of data from user space.</span>
00091 <span class="comment"> *</span>
00092 <span class="comment"> * If some data could not be copied, this function will pad the copied</span>
00093 <span class="comment"> * data to the requested size using zero bytes.</span>
00094 <span class="comment"></span>
00095 <span class="comment"> * @param dst Destination address, in kernel space.</span>
00096 <span class="comment"> * @param src Source address, in user space.</span>
00097 <span class="comment"> * @param count Number of bytes to copy.</span>
00098 <span class="comment"> * @return number of bytes that could not be copied. On success, </span>
00099 <span class="comment"> * this will be zero.</span>
00100 <span class="comment"> *</span>
00101 <span class="comment"> */</span>
00102
00103 <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> <span class="keyword">inline</span>
<a name="l00104"></a><a class="code" href="copy_8c.html#a1">00104</a> <a class="code" href="copy_8c.html#a1">_stp_copy_from_user</a> (<span class="keywordtype">char</span> *dst, <span class="keyword">const</span> <span class="keywordtype">char</span> __user *src, <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> count)
00105 {
00106 <span class="keywordflow">return</span> __copy_from_user_inatomic(dst, src, count);
00107 }
00108 <span class="comment"></span>
00109 <span class="comment">/** Copy an argv from user space to a List.</span>
00110 <span class="comment"> *</span>
00111 <span class="comment"> * @param list A list.</span>
00112 <span class="comment"> * @param argv Source argv, in user space.</span>
00113 <span class="comment"> * @return number of elements in <i>list</i></span>
00114 <span class="comment"> *</span>
00115 <span class="comment"> * @b Example:</span>
00116 <span class="comment"> * @include argv.c</span>
00117 <span class="comment"> */</span>
00118
<a name="l00119"></a><a class="code" href="copy_8c.html#a2">00119</a> <span class="keywordtype">int</span> <a class="code" href="copy_8c.html#a2">_stp_copy_argv_from_user</a> (<a class="code" href="structmap__root.html">MAP</a> list, <span class="keywordtype">char</span> __user *__user *argv)
00120 {
00121 <span class="keywordtype">char</span> str[128];
00122 <span class="keywordtype">char</span> __user *vstr;
00123 <span class="keywordtype">int</span> len;
00124
00125 <span class="keywordflow">if</span> (argv)
00126 argv++;
00127
00128 <span class="keywordflow">while</span> (argv != NULL) {
00129 <span class="keywordflow">if</span> (get_user (vstr, argv))
00130 <span class="keywordflow">break</span>;
00131
00132 <span class="keywordflow">if</span> (vstr == NULL)
00133 <span class="keywordflow">break</span>;
00134
00135 len = <a class="code" href="copy_8c.html#a0">_stp_strncpy_from_user</a>(str, vstr, 128);
00136 str[len] = 0;
00137 <a class="code" href="map_8c.html#a27">_stp_list_add_str</a> (list, str);
00138 argv++;
00139 }
00140 <span class="keywordflow">return</span> list-><a class="code" href="structmap__root.html#o2">num</a>;
00141 }
</pre></div><hr size="1"><address style="align: right;"><small>
Generated on Tue Mar 22 10:27:36 2005 for SystemTap.</small></body>
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