{"rsdb":{"rid":"244563","subhead":"","postdate":"0","aid":"168300","fid":"54","uid":"1","topic":"1","content":"<p style=\"text-align: center;\"><img src=\"..\/..\/upload\/2018_01\/180126082661031.jpg\" alt=\"\" width=\"800\" height=\"343\" \/><\/p><br\/><p>\u8c03\u8bd5 C \u7a0b\u5e8f\uff0c\u66fe\u8ba9\u6211\u5f88\u56f0\u6270\u3002\u7136\u800c\u5f53\u6211\u4e4b\u524d\u5728\u5199\u6211\u7684\u64cd\u4f5c\u7cfb\u7edf\u65f6\uff0c\u6211\u6709\u5f88\u591a\u7684 Bug \u9700\u8981\u8c03\u8bd5\u3002\u6211\u5f88\u5e78\u8fd0\u7684\u4f7f\u7528\u4e0a\u4e86 qemu \u6a21\u62df\u5668\uff0c\u5b83\u5141\u8bb8\u6211\u5c06\u8c03\u8bd5\u5668\u9644\u52a0\u5230\u6211\u7684\u64cd\u4f5c\u7cfb\u7edf\u3002\u8fd9\u4e2a\u8c03\u8bd5\u5668\u5c31\u662f <code>gdb<\/code>\u3002<\/p><br\/><p>\u6211\u5f97\u89e3\u91ca\u4e00\u4e0b\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>gdb<\/code> \u5148\u505a\u4e00\u4e9b\u5c0f\u4e8b\u60c5\uff0c\u56e0\u4e3a\u6211\u53d1\u73b0\u521d\u5b66\u5b83\u7684\u65f6\u5019\u771f\u7684\u5f88\u6df7\u4e71\u3002\u6211\u4eec\u63a5\u4e0b\u6765\u4f1a\u5728\u4e00\u4e2a\u5c0f\u7a0b\u5e8f\u4e2d\uff0c\u8bbe\u7f6e\u65ad\u70b9\uff0c\u67e5\u770b\u5185\u5b58\u3002<\/p><br\/><p>&nbsp;<\/p><br\/><p>\u5982\u679c\u4f60\u66fe\u7ecf\u4f7f\u7528\u8fc7\u8c03\u8bd5\u5668\uff0c\u90a3\u4f60\u53ef\u80fd\u5df2\u7ecf\u4f1a\u8bbe\u7f6e\u65ad\u70b9\u4e86\u3002<\/p><br\/><p>\u4e0b\u9762\u662f\u4e00\u4e2a\u6211\u4eec\u8981\u8c03\u8bd5\u7684\u7a0b\u5e8f\uff08\u867d\u7136\u6ca1\u6709\u4efb\u4f55 Bug\uff09:<\/p><br\/><p>\u53e6\u5b58\u4e3a <code>hello.c<\/code>. \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 <code>dbg<\/code> \u8c03\u8bd5\u5b83\uff0c\u50cf\u8fd9\u6837\uff1a<\/p><br\/><p>\u4ee5\u4e0a\u662f\u5e26\u8c03\u8bd5\u4fe1\u606f\u7f16\u8bd1 <code>hello.c<\/code>\uff08\u4e3a\u4e86 <code>gdb<\/code> \u53ef\u4ee5\u66f4\u597d\u5de5\u4f5c\uff09\uff0c\u5e76\u4e14\u5b83\u4f1a\u7ed9\u6211\u4eec\u9192\u76ee\u7684\u63d0\u793a\u7b26\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p><br\/><p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 <code>break<\/code> \u547d\u4ee4\u8bbe\u7f6e\u65ad\u70b9\uff0c\u7136\u540e\u4f7f\u7528 <code>run<\/code> \u5f00\u59cb\u8c03\u8bd5\u7a0b\u5e8f\u3002<\/p><br\/><p>\u7a0b\u5e8f\u6682\u505c\u5728\u4e86 <code>do_thing<\/code> \u5f00\u59cb\u7684\u5730\u65b9\u3002<\/p><br\/><p>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 <code>where<\/code> \u67e5\u770b\u6211\u4eec\u6240\u5728\u7684\u8c03\u7528\u6808\u3002<\/p><br\/><p>&nbsp;<\/p><br\/><p>\u4f7f\u7528 <code>disassemble<\/code> \u547d\u4ee4\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u51fd\u6570\u7684\u6c47\u7f16\u4ee3\u7801\u3002\u68d2\u7ea7\u4e86\uff0c\u8fd9\u662f x86 \u6c47\u7f16\u4ee3\u7801\u3002\u867d\u7136\u6211\u4e0d\u662f\u5f88\u61c2\u5b83\uff0c\u4f46\u662f <code>callq<\/code> \u8fd9\u4e00\u884c\u662f <code>printf<\/code> \u51fd\u6570\u8c03\u7528\u3002<\/p><br\/><p>\u4f60\u4e5f\u53ef\u4ee5\u4f7f\u7528 <code>disassemble<\/code> \u7684\u7f29\u5199 <code>disas<\/code>\u3002<\/p><br\/><p>&nbsp;<\/p><br\/><p>\u5f53\u8c03\u8bd5\u6211\u7684\u5185\u6838\u65f6\uff0c\u6211\u4f7f\u7528 <code>gdb<\/code> \u7684\u4e3b\u8981\u539f\u56e0\u662f\uff0c\u4ee5\u786e\u4fdd\u5185\u5b58\u5e03\u5c40\u662f\u5982\u6211\u6240\u60f3\u7684\u90a3\u6837\u3002\u68c0\u67e5\u5185\u5b58\u7684\u547d\u4ee4\u662f <code>examine<\/code>\uff0c\u6216\u8005\u4f7f\u7528\u7f29\u5199 <code>x<\/code>\u3002\u6211\u4eec\u5c06\u4f7f\u7528<code>x<\/code>\u3002<\/p><br\/><p>\u901a\u8fc7\u9605\u8bfb\u4e0a\u9762\u7684\u6c47\u7f16\u4ee3\u7801\uff0c\u4f3c\u4e4e <code>0x40060c<\/code> \u53ef\u80fd\u662f\u6211\u4eec\u6240\u8981\u6253\u5370\u7684\u5b57\u7b26\u4e32\u5730\u5740\u3002\u6211\u4eec\u6765\u8bd5\u4e00\u4e0b\u3002<\/p><br\/><p>\u7684\u786e\u662f\u8fd9\u6837\u3002<code>x\/s<\/code> \u4e2d <code>\/s<\/code> \u90e8\u5206\uff0c\u610f\u601d\u662f\u201c\u628a\u5b83\u4f5c\u4e3a\u5b57\u7b26\u4e32\u5c55\u793a\u201d\u3002\u6211\u4e5f\u53ef\u4ee5\u201c\u5c55\u793a 10 \u4e2a\u5b57\u7b26\u201d\uff0c\u50cf\u8fd9\u6837\uff1a<\/p><br\/><p>\u4f60\u53ef\u4ee5\u770b\u5230\u524d\u56db\u4e2a\u5b57\u7b26\u662f <code>H<\/code>\u3001<code>i<\/code>\u3001<code>!<\/code> \u548c <code>\\0<\/code>\uff0c\u5e76\u4e14\u5b83\u4eec\u4e4b\u540e\u7684\u662f\u4e00\u4e9b\u4e0d\u76f8\u5173\u7684\u4e1c\u897f\u3002<\/p><br\/><p>\u6211\u77e5\u9053 <code>gdb<\/code> \u5f88\u591a\u5176\u4ed6\u7684\u4e1c\u897f\uff0c\u4f46\u662f\u6211\u4ecd\u7136\u4e0d\u662f\u5f88\u4e86\u89e3\u5b83\uff0c\u5176\u4e2d <code>x<\/code> \u548c <code>break<\/code> \u8ba9\u6211\u83b7\u5f97\u5f88\u591a\u3002\u4f60\u8fd8\u53ef\u4ee5\u9605\u8bfb <a rel=\"external nofollow\" target=\"_blank\">do umentation for examining memory<\/a>\u3002<\/p><br\/>","orderid":"0","title":"GDB \u7b80\u6613\u5165\u95e8\u6559\u7a0b","smalltitle":"","mid":"0","fname":"linux\u7f16\u7a0b\u57fa\u7840","special_id":"0","bak_id":"0","info":"0","hits":"158","pages":"1","comments":"0","posttime":"2018-02-13 12:56:55","list":"1518497815","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=GDB' target=_blank>GDB<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%BC%F2%D2%D7' target=_blank>\u7b80\u6613<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%C8%EB%C3%C5%BD%CC%B3%CC' target=_blank>\u5165\u95e8\u6559\u7a0b<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"113.87.122.142","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"GDB \u7b80\u6613\u5165\u95e8\u6559\u7a0b","lastview":"1713912736","digg_num":"2","digg_time":"1710716860","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}