{"id":143,"date":"2017-11-09T10:19:56","date_gmt":"2017-11-09T02:19:56","guid":{"rendered":"http:\/\/www.hyh0.com\/?p=143"},"modified":"2017-11-09T19:39:08","modified_gmt":"2017-11-09T11:39:08","slug":"3-%e6%b1%87%e7%bc%96%e4%b8%ad%e7%9a%84%e8%bd%ac%e7%a7%bb%e6%8c%87%e4%bb%a4","status":"publish","type":"post","link":"https:\/\/www.hyh0.com\/?p=143","title":{"rendered":"3. \u6c47\u7f16\u4e2d\u7684\u8f6c\u79fb\u6307\u4ee4"},"content":{"rendered":"<p>\u53ef\u4ee5\u4fee\u6539IP\uff08\u6bb5\u5185\u8f6c\u79fb\uff09\uff0c\u6216\u8005\u80fd\u591f\u540c\u65f6\u4fee\u6539IP\u548cCS\u7684\u6307\u4ee4\uff08\u6bb5\u95f4\u8f6c\u79fb\uff09\u79f0\u4e3a\u8f6c\u79fb\u6307\u4ee4<\/p>\n<p><!--more-->8086\u6c47\u7f16\u4e2d\u7684\u8f6c\u79fb\u6307\u4ee4\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u7c7b\uff1a<\/p>\n<ul>\n<li>\u65e0\u6761\u4ef6\u8f6c\u79fb\u6307\u4ee4(eg. jmp)<\/li>\n<li>\u6761\u4ef6\u8f6c\u79fb\u6307\u4ee4<\/li>\n<li>\u5faa\u73af\u6307\u4ee4(eg. loop)<\/li>\n<li>\u8fc7\u7a0b<\/li>\n<li>\u4e2d\u65ad<\/li>\n<\/ul>\n<h4>jmp \u6307\u4ee4<\/h4>\n<p>jmp\u6307\u4ee4\u662f\u65e0\u6761\u4ef6\u8f6c\u79fb\u6307\u4ee4\uff0c\u6839\u636e\u8f6c\u79fb\u7684\u8303\u56f4\uff0c\u53ef\u4ee5\u5206\u4e3a3\u7c7b<\/p>\n<ul>\n<li>jmp short \u6bb5\u5185\u77ed\u8f6c\u79fb\u6307\u4ee4(\u5bf9IP\u7684\u4fee\u6539\u8303\u56f4\u4e3a-128~127)<\/li>\n<li>jmp near ptr \u6bb5\u5185\u8fd1\u8f6c\u79fb\u6307\u4ee4(\u5bf9IP\u7684\u4fee\u6539\u8303\u56f4\u4e3a-32768~32767)<\/li>\n<li>jmp far ptr \u8fdc\u8f6c\u79fb\u6307\u4ee4(\u5b9e\u73b0\u6bb5\u95f4\u8f6c\u79fb) \u00a0 \u00a0 *\u5728emu8086\u4e2d\u65e0\u6cd5\u4f7f\u7528<\/li>\n<\/ul>\n<p>\u5728\u5b9e\u9645\u7684\u5904\u7406\u4e2d\uff0c\u7f16\u8bd1\u5668\u4f1a\u6839\u636e\u5b9e\u9645\u7684\u8f6c\u79fb\u8ddd\u79bb\u9009\u62e9\u5408\u9002\u7684\u6307\u4ee4\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u4f7f\u7528 jmp label\/reg \u5373\u53ef<\/p>\n<p>jmp\u6307\u4ee4\u8fd8\u53ef\u4ee5\u7528\u5185\u5b58\u5355\u5143\u4e2d\u7684\u5730\u5740\u4fee\u6539IP\u4e0eCS<\/p>\n<ul>\n<li>jmp word ptr [Address] \u7528\u5185\u5b58\u5355\u5143\u4e2d\u7684\u5730\u5740\u5b9e\u73b0\u6bb5\u5185\u8f6c\u79fb<\/li>\n<li>jmp dword ptr [Address] \u7528\u5185\u5b58\u5355\u5143\u4e2d\u7684\u5730\u5740\u5b9e\u73b0\u6bb5\u95f4\u8f6c\u79fb(\u4f4e\u4f4d\u4fee\u6539IP\uff0c\u9ad8\u4f4d\u4fee\u6539CS\uff09<\/li>\n<\/ul>\n<h4>jcxz \u6761\u4ef6\u8f6c\u79fb\u6307\u4ee4<\/h4>\n<p>jcxz\u6267\u884c\u7684\u662f\u77ed\u8f6c\u79fb\uff0c\u5bf9IP\u7684\u4fee\u6539\u8303\u56f4\u662f-128~127<\/p>\n<p>\u8df3\u8f6c\u7531cx\u63a7\u5236\uff0c\u5f53 cx == 0 \u65f6\u8fdb\u884c\u8df3\u8f6c\uff0c\u5426\u5219\u7ee7\u7eed\u6267\u884c<\/p>\n<p>\u7528C\u7684\u98ce\u683c\u63cf\u8ff0\u5219\u662f\uff1a<\/p>\n<p>if (cx == 0) jmp short label<\/p>\n<h4>loop \u5faa\u73af\u6307\u4ee4<\/h4>\n<p>loop\u6307\u4ee4\u4e5f\u662f\u77ed\u8f6c\u79fb\u8bed\u53e5\uff0c\u5b83\u53ef\u4ee5\u5206\u4e3a\u4e24\u6b65\uff1a<\/p>\n<ol>\n<li>dec cx<\/li>\n<li>if (cx != 0) jmp short label<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u53ef\u4ee5\u4fee\u6539IP\uff08\u6bb5\u5185\u8f6c\u79fb\uff09\uff0c\u6216\u8005\u80fd\u591f\u540c\u65f6\u4fee\u6539IP\u548cCS\u7684\u6307\u4ee4\uff08\u6bb5\u95f4\u8f6c\u79fb\uff09\u79f0\u4e3a\u8f6c\u79fb\u6307\u4ee4<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/143"}],"collection":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=143"}],"version-history":[{"count":3,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/143\/revisions"}],"predecessor-version":[{"id":147,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=\/wp\/v2\/posts\/143\/revisions\/147"}],"wp:attachment":[{"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hyh0.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}