{"id":2219,"date":"2007-06-19T22:20:51","date_gmt":"2007-06-19T14:20:51","guid":{"rendered":"https:\/\/www.ecjtu.com\/keith\/archives\/2219"},"modified":"2007-06-30T17:03:46","modified_gmt":"2007-06-30T09:03:46","slug":"%e4%bb%8ec51%e7%9a%84%e6%8c%87%e9%92%88%e5%88%b0%e7%97%85%e6%af%92","status":"publish","type":"post","link":"https:\/\/www.ecjtu.com\/keith\/archives\/2219","title":{"rendered":"\u4eceC51\u7684\u6307\u9488\u5230\u75c5\u6bd2"},"content":{"rendered":"<p>c51\u8f6f\u590d\u4f4d,\u7ecf\u5178,\u5206\u6790\u900f\u5f7b<\/p>\n<p>&#8230;&#8230;..\u6ce8\uff1a\u8f6c\u8d34&#8230;&#8230;&#8230;..<\/p>\n<p>\u4ece\u5355\u7247\u673a\u6307\u9488\u8bf4\u5230\u9ed1\u5ba2\u7a0b\u5e8f<\/p>\n<p>2004\u5e747\u6708\u7684\u4e00\u5929,\u5728\u7535\u5b50BBS\u8ba8\u8bba\u533a\u4e0a\u6e9c\u8fbe,\u770b\u5230\u4e00\u4e2a\u6709\u8da3\u7684\u5e16\u5b50,\u6574\u4e2a\u5e16\u5b50\u5185\u5bb9\u5982\u4e0b\uff1a<\/p>\n<p>\u7eafC51\u590d\u4f4d\u529f\u80fd\u51fd\u6570\uff1a\u4e00\u4e2a\u5927\u4e09\u5b66\u751f,\u8ba9\u4eba\u53c8\u7231\u53c8\u6015<\/p>\n<p>\u73b0\u5355\u5217\u590d\u4f4d\u90e8\u5206\u5982\u4e0b\uff1a<\/p>\n<p>main()<\/p>\n<p>{<\/p>\n<p>unsigned char code rst[]={0xe4,0xc0,0xe0,0xc0,0xe0,0x32}; \/\/ \u590d\u4f4d\u4ee3\u7801<\/p>\n<p>(*((void (*)())(rst)))(); \/\/ \u6267\u884c\u4e0a\u4e00\u884c\u4ee3\u7801,\u5c06rst\u6570\u7ec4\u5f53\u51fd\u6570\u8c03\u7528<\/p>\n<p>}<\/p>\n<p>\u672c\u6765\u6211\u544a\u8bc9\u4ed6\u5d4c\u5165\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n<p>clr a<\/p>\n<p>push acc<\/p>\n<p>push acc<\/p>\n<p>reti<\/p>\n<p>\u7ed3\u679c\u4ed6\u5374\u73a9\u4e86\u524d\u9762\u54ea\u4e00\u6bb5,\u800c\u6570\u7ec4rst[]\u4e2d\u7684\u5185\u5bb9\u6070\u6070\u662f\u4e0a\u9762\u7684\u6c47\u7f16\u673a\u5668\u7801,\u4ed6\u7684\u505a\u6cd5\u662f\u5c06<br \/>\nrst\u6570\u7ec4\u7684\u6570\u636e\u5f53\u4f5c\u4ee3\u7801\u4fdd\u5b58,\u7136\u540e\u91c7\u7528\u7edd\u5bf9\u5730\u5740\u65b9\u5f0f\u6307\u5411\u8be5\u6570\u7ec4,\u5c06\u8be5\u6570\u7ec4\u4e2d\u7684\u4ee3\u7801\u5f53\u4f5c<br \/>\n\u51fd\u6570\u6765\u8fd0\u884c\u3002\u5c45\u7136\u901a\u8fc7\u4e86\uff01<\/p>\n<p>\u6211\u89c9\u5f97\u6709\u95ee\u9898,\u6211\u8bf4\u5373\u4f7f\u5982\u6b64,\u90a3\u7edd\u5bf9\u5730\u5740\u8c03\u7528\u4e5f\u5e94\u8be5\u5199\u6210(*((void (*)())(&amp;rst)))()<br \/>\n\u624d\u5bf9\u5440,\u7ed3\u679c\u4ed6\u53cd\u9a73\u8bf4,\u90a3\u6837\u7684\u8bdd,rst\u7684\u5730\u5740\u5c31\u4f1a\u5f53\u6210\u53c2\u6570\u4f20\u9012\u7ed9\u8fd9\u4e2a\u7edd\u5bf9\u5730\u5740\u51fd\u6570,\u800c<br \/>\n\u5b9e\u9645LJMP\u8c03\u7528\u7684\u5730\u5740\u5e76\u975erst\u7684\u5730\u5740,\u800c\u662f\u4e00\u4e2a\u4e0d\u786e\u5b9a\u7684\u5730\u5740\u3002\u4e8e\u662f\u6211\u6309\u7167\u81ea\u5df1\u7684\u8bf4\u6cd5\u5c1d\u8bd5<br \/>\n\u4e86\u4e00\u4e0b,\u770b\u770b\u6c47\u7f16\u7ed3\u679c,\u8fd8\u771f\u7684\u662f\u5c06rst\u7684\u5730\u5740\u4f20\u9012\u7ed9\u4e86R1 R2,\u800c\u7edd\u5bf9\u51fd\u6570\u6700\u7ec8LJMP\u5230\u4e86<br \/>\n\u4e00\u4e2a\u83ab\u540d\u5176\u5999\u7684\u5730\u5740\u4e0a\u53bb\u4e86,\u6b7b\u7fd8\uff01<\/p>\n<p>\u770b\u6765C\u771f\u662f\u4e00\u5339\u4e0d\u5bb9\u6613\u9a7e\u9a6d\u7684\u91ce\u9a6c,\u8fd9\u4e2a\u5927\u4e09\u5b66\u751f\u7406\u89e3\u529b\u5728\u6211\u4e4b\u4e0a,\u621130\u591a\u5c81\u7684\u4eba\u4e86,\u5e72\u4e86<br \/>\n\u8fd9\u4e48\u591a\u5e74\u8fd8\u6ca1\u4ed6\u7684\u5883\u754c\u5462,\u5509,\u4eba\u5bb6\u624d\u5b66\u4e86\u51e0\u5929\u554a,\u7ffb\u4e86\u51e0\u5929\u4e66\u5c31\u8fd9\u4e48\u5389\u5bb3\u4e86,\u670d\u4e86\uff01<\/p>\n<p>l \u9996\u5148\u5206\u6790\u5e16\u5b50\u7684C\u8bed\u8a00\u4ee3\u7801<\/p>\n<p>\u7b2c\u4e00\u53e5\u5b9a\u4e49\u4e00\u4e2a\u6570\u7ec4rst[],\u6570\u7ec4\u5185\u6570\u636e\u5c31\u662f\u5b8c\u6210\u590d\u4f4d\u529f\u80fd\u7684\u6c47\u7f16\u673a\u5668\u7801,\u5177\u4f53\u5bf9\u5e94\u5173\u7cfb<br \/>\n\u4e3a\uff1aclr a == 0xe4\u3001push acc == 0xc0,0xe0\u3001reti ==0x32<\/p>\n<p>\u7b2c\u4e8c\u53e5\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u7684\u7528\u6cd5,\u51fd\u6570\u6307\u9488\u7528\u6cd5\u7a0d\u5fae\u6709\u70b9\u590d\u6742,\u53ef\u53c2\u770b\u672c\u4eba\u8457\u7684\u4e66,:),\u4ee5<br \/>\n\u4e0b\u4e3a\u5feb\u901f\u5165\u95e8\u8bb2\u89e3\u3002<\/p>\n<p>\u5b9a\u4e49\u4e00\u4e2a\u8fd4\u56de\u503c\u662f\u7a7a\u51fd\u6570\u6307\u9488\u7684\u5b9a\u4e49\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n<p>void (*p) ( )<\/p>\n<p>\u5f53\u628a\u51fd\u6570\u6307\u9488\u8d4b\u503c\u540e,\u5c31\u80fd\u901a\u8fc7\u51fd\u6570\u6307\u9488\u8c03\u7528\u51fd\u6570,\u8c03\u7528\u5f62\u5f0f\u5982\u4e0b,<\/p>\n<p>(*p) ( );<\/p>\n<p>\u6216\u7b49\u4ef7\u7684\u7b80\u5316\u5f62\u5f0f\uff1a<\/p>\n<p>p ( );<\/p>\n<p>\u5047\u8bberst\u5c31\u662f\u51fd\u6570\u6307\u9488,\u5219\u5982\u4e0b\u8c03\u7528\u5f62\u5f0f\u5c31\u53ef\u4ee5\u4ee4\u5355\u7247\u673a\u590d\u4f4d\u518d\u8d77\u3002<\/p>\n<p>(*rst ) ( );<\/p>\n<p>\u4f46\u53ef\u60dc,rst\u4e0d\u662f\u51fd\u6570\u6307\u9488,\u800c\u662f\u6570\u7ec4\u540d,\u867d\u7136\u4e24\u8005\u90fd\u662f\u5730\u5740,\u4f46\u4e0d\u53ef\u76f4\u63a5\u8c03\u7528\u6570\u7ec4\u540d\u3002<\/p>\n<p>\u5982\u540c\u628achar\u578b\u53d8\u91cfa\u8d4b\u503c\u7ed9int\u578b\u53d8\u91cfb,(int) \u8868\u793a\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\uff1a<\/p>\n<p>b = (int) a<\/p>\n<p>\u51fd\u6570\u6307\u9488\u7684\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362\u516c\u5f0f\u5982\u4e0b\uff08C\u8bed\u8a00\u7684\u54f2\u5b66\u662f\u5b9a\u4e49\u5f62\u5f0f\u548c\u4f7f\u7528\u4e00\u81f4\uff09\uff1a<\/p>\n<p>( (void (*)() ) rst<\/p>\n<p>\u8fd9\u6837\u7ecf\u8fc7\u8f6c\u6362\u540e\u7684rst\u5c31\u53ef\u4ee5\u5f53\u4f5c\u51fd\u6570\u6307\u9488\u4f7f\u7528\u4e86,\u7b80\u5355\u7684\u8c03\u7528\u5f62\u5f0f\u5982\u4e0b\uff1a<\/p>\n<p>#define K ( (void (*)( ) ) rst<\/p>\n<p>(*K) ( )<\/p>\n<p>\u6216\uff1a<\/p>\n<p>( * ( void (*)( ) )rst ) ( );<\/p>\n<p>\u8fd9\u6837\u7684\u8bed\u53e5\u5c31\u5b8c\u6210\u590d\u4f4d\u518d\u542f\u529f\u80fd\u4e86\u3002\u7c7b\u578b\u8f6c\u6362\u7b26()\u7684\u4f18\u5148\u7ea7\u8ddf\u6307\u9488\u8fd0\u7b97\u7b26*\u7684\u4f18\u5148\u7ea7\u76f8\u540c,<br \/>\n\u4e8c\u8005\u7684\u7ed3\u5408\u65b9\u5411\u662f\u81ea\u53f3\u81f3\u5de6,\u6240\u4ee5\u4e0a\u8ff0\u8bed\u53e5\u5c31\u80fd\u5b8c\u6210\u590d\u4f4d\u529f\u80fd\u4e86\u3002\u4fdd\u9669\u8d77\u89c1\u6709\u4e9b\u7a0b\u5e8f\u5458\u5e38<br \/>\n\u5e38\u559c\u6b22\u518d\u52a0\u4e2a\u62ec\u53f7\uff1a<\/p>\n<p>#define K ( ( (void (*)( ) ) rst )<\/p>\n<p>(*K) ( )<\/p>\n<p>\u6216<\/p>\n<p>( *( ( void (*)( ) )rst ) ) ( );<\/p>\n<p>\u7531\u4e8e\u6ca1\u6709\u8f93\u5165\u53c2\u6570,\u4e0a\u8ff0\u590d\u4f4d\u4ee3\u7801\u66f4\u4e25\u8c28\u7684\u5199\u6cd5\u662f\uff1a<\/p>\n<p>#define K ( ( (void (*)(void ) ) rst )<\/p>\n<p>(*K) ( )<\/p>\n<p>\u6216<\/p>\n<p>( *( ( void (*)(void ) )rst ) ) ( );<\/p>\n<p>l 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\/>\n\u5bf9\u5f88\u590d\u6742\u7684\u8bed\u53e5,\u8981\u8003\u8651\u5230\u7f16\u8bd1\u5668\u4e0d\u4e25\u683c\u751a\u81f3\u51fa\u9519\u7684\u53ef\u80fd\u6027\u3002<\/p>\n<p>l \u54c8\u4f5b\u7ed3\u6784\u548c\u4e00\u4e2a\u8815\u866b\u75c5\u6bd2<\/p>\n<p>\u8bf7\u6ce8\u610f,\u5b9a\u4e49\u6570\u7ec4rst[]\u65f6\u7528\u4e86\u5173\u952e\u5b57code,\u8fd9\u662fC51\u7279\u6709\u7684\u5173\u952e\u5b57,\u610f\u5473\u7740\u628a\u6570\u7ec4\u5b9a\u4e49\u5230<br \/>\n\u7a0b\u5e8f\u7a7a\u95f4\u3002\u6807\u51c6C\u662f\u6ca1\u6709\u5173\u952e\u5b57code\u7684\u3002<\/p>\n<p>\u54c8\u4f5b\u7ed3\u6784\u548c\u666e\u6797\u65af\u987f\u7ed3\u6784\uff1a<\/p>\n<p>\u54c8\u4f5b\u7ed3\u6784\u2014\u2014\u7a0b\u5e8f\u7a7a\u95f4\u548c\u5b58\u50a8\u7a7a\u95f4\u5206\u5f00\u7684\u3002C51\u7b97\u662f\u4e0d\u592a\u4e25\u683c\u7684\u54c8\u4f5b\u7ed3\u6784\u2014\u2014\u867d\u5730\u5740\u7ebf\u5206<br \/>\n\u5f00,\u4f46\u6570\u636e\u7ebf\u6ca1\u6709\u5206\u5f00\u3002DSP\u662f\u589e\u5f3a\u7684\u54c8\u4f5b\u7ed3\u6784\u3002<\/p>\n<p>PC\u7535\u8111\u4e0a\u5954\u817eCPU\u662f\u666e\u6797\u65af\u987f\u7ed3\u6784\u2014\u2014\u6570\u636e\u7a7a\u95f4\u548c\u7a0b\u5e8f\u7a7a\u95f4\u7edf\u4e00\u7f16\u5740\u3002<\/p>\n<p>\u5982\u679c\u6570\u7ec4rst[]\u6570\u636e\u7684\u6c47\u7f16\u673a\u5668\u7801\u662f\u5220\u9664\u6587\u4ef6\u7684\u673a\u5668\u7801,\u8fd9\u7b97\u4e0d\u7b97\u662f\u75c5\u6bd2\uff1f<\/p>\n<p>\u66fe\u7ecf\u6d41\u884c\u8fc7\u4e00\u79cd\u8815\u866b\u75c5\u6bd2,\u5176\u53d1\u4f5c\u673a\u7406\u91c7\u53d6\u7684\u5c31\u662f\u5c06\u6076\u610f\u4ee3\u7801\u4fdd\u5b58\u6210\u6587\u672c\u6587\u4ef6,\u7136\u540e\u901a\u8fc7<br 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