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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: cpu.cpp Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>cpu.cpp</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">// cpu.cpp - written and placed in the public domain by Wei Dai</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="preprocessor">#include "pch.h"</span><a name="l00004"></a>00004 <a name="l00005"></a>00005 <span class="preprocessor">#ifndef CRYPTOPP_IMPORTS</span><a name="l00006"></a>00006 <span class="preprocessor"></span><a name="l00007"></a>00007 <span class="preprocessor">#include "cpu.h"</span><a name="l00008"></a>00008 <span class="preprocessor">#include "misc.h"</span><a name="l00009"></a>00009 <span class="preprocessor">#include <algorithm></span><a name="l00010"></a>00010 <a name="l00011"></a>00011 <span class="preprocessor">#ifdef __GNUC__</span><a name="l00012"></a>00012 <span class="preprocessor"></span><span class="preprocessor">#include <signal.h></span><a name="l00013"></a>00013 <span class="preprocessor">#include <setjmp.h></span><a name="l00014"></a>00014 <span class="preprocessor">#endif</span><a name="l00015"></a>00015 <span class="preprocessor"></span><a name="l00016"></a>00016 <span class="preprocessor">#ifdef CRYPTOPP_MSVC6PP_OR_LATER</span><a name="l00017"></a>00017 <span class="preprocessor"></span><span class="preprocessor">#include <emmintrin.h></span><a name="l00018"></a>00018 <span class="preprocessor">#endif</span><a name="l00019"></a>00019 <span class="preprocessor"></span><a name="l00020"></a>00020 NAMESPACE_BEGIN(CryptoPP)<a name="l00021"></a>00021 <a name="l00022"></a>00022 <span class="preprocessor">#ifdef CRYPTOPP_X86_ASM_AVAILABLE</span><a name="l00023"></a>00023 <span class="preprocessor"></span><a name="l00024"></a>00024 <span class="preprocessor">#ifndef _MSC_VER</span><a name="l00025"></a>00025 <span class="preprocessor"></span><span class="keyword">typedef</span> void (*SigHandler)(int);<a name="l00026"></a>00026 <a name="l00027"></a>00027 <span class="keyword">static</span> jmp_buf s_jmpNoCPUID;<a name="l00028"></a>00028 <span class="keyword">static</span> <span class="keywordtype">void</span> SigIllHandlerCPUID(<span class="keywordtype">int</span>)<a name="l00029"></a>00029 {<a name="l00030"></a>00030 longjmp(s_jmpNoCPUID, 1);<a name="l00031"></a>00031 }<a name="l00032"></a>00032 <span class="preprocessor">#endif</span><a name="l00033"></a>00033 <span class="preprocessor"></span><a name="l00034"></a>00034 <span class="keywordtype">bool</span> CpuId(word32 input, word32 *output)<a name="l00035"></a>00035 {<a name="l00036"></a>00036 <span class="preprocessor">#ifdef _MSC_VER</span><a name="l00037"></a>00037 <span class="preprocessor"></span> __try<a name="l00038"></a>00038 {<a name="l00039"></a>00039 __asm<a name="l00040"></a>00040 {<a name="l00041"></a>00041 mov eax, input<a name="l00042"></a>00042 cpuid<a name="l00043"></a>00043 mov edi, output<a name="l00044"></a>00044 mov [edi], eax<a name="l00045"></a>00045 mov [edi+4], ebx<a name="l00046"></a>00046 mov [edi+8], ecx<a name="l00047"></a>00047 mov [edi+12], edx<a name="l00048"></a>00048 }<a name="l00049"></a>00049 }<a name="l00050"></a>00050 __except (1)<a name="l00051"></a>00051 {<a name="l00052"></a>00052 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00053"></a>00053 }<a name="l00054"></a>00054 <span class="keywordflow">return</span> <span class="keyword">true</span>;<a name="l00055"></a>00055 <span class="preprocessor">#else</span><a name="l00056"></a>00056 <span class="preprocessor"></span> SigHandler oldHandler = signal(SIGILL, SigIllHandlerCPUID);<a name="l00057"></a>00057 <span class="keywordflow">if</span> (oldHandler == SIG_ERR)<a name="l00058"></a>00058 <span class="keywordflow">return</span> <span class="keyword">false</span>;<a name="l00059"></a>00059 <a name="l00060"></a>00060 <span class="keywordtype">bool</span> result = <span class="keyword">true</span>;<a name="l00061"></a>00061 <span class="keywordflow">if</span> (setjmp(s_jmpNoCPUID))<a name="l00062"></a>00062 result = <span class="keyword">false</span>;<a name="l00063"></a>00063 <span class="keywordflow">else</span><a name="l00064"></a>00064 {<a name="l00065"></a>00065 __asm__<a name="l00066"></a>00066 (<a name="l00067"></a>00067 <span class="comment">// save ebx in case -fPIC is being used</span><a name="l00068"></a>00068 #<span class="keywordflow">if</span> CRYPTOPP_BOOL_X86<a name="l00069"></a>00069 <span class="stringliteral">"push %%ebx; cpuid; mov %%ebx, %%edi; pop %%ebx"</span><a name="l00070"></a>00070 #<span class="keywordflow">else</span><a name="l00071"></a>00071 <span class="stringliteral">"pushq %%rbx; cpuid; mov %%ebx, %%edi; popq %%rbx"</span><a name="l00072"></a>00072 #endif<a name="l00073"></a>00073 : <span class="stringliteral">"=a"</span> (output[0]), <span class="stringliteral">"=D"</span> (output[1]), <span class="stringliteral">"=c"</span> (output[2]), <span class="stringliteral">"=d"</span> (output[3])<a name="l00074"></a>00074 : <span class="stringliteral">"a"</span> (input)<a name="l00075"></a>00075 );<a name="l00076"></a>00076 }<a name="l00077"></a>00077 <a name="l00078"></a>00078 signal(SIGILL, oldHandler);<a name="l00079"></a>00079 <span class="keywordflow">return</span> result;<a name="l00080"></a>00080 <span class="preprocessor">#endif</span><a name="l00081"></a>00081 <span class="preprocessor"></span>}<a name="l00082"></a>00082 <a name="l00083"></a>00083 <span class="preprocessor">#ifndef _MSC_VER</span><a name="l00084"></a>00084 <span class="preprocessor"></span><span class="keyword">static</span> jmp_buf s_jmpNoSSE2;<a name="l00085"></a>00085 <span class="keyword">static</span> <span class="keywordtype">void</span> SigIllHandlerSSE2(<span class="keywordtype">int</span>)<a name="l00086"></a>00086 {⌨️ 快捷键说明
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