{"id":3440,"date":"2021-08-07T11:02:10","date_gmt":"2021-08-07T03:02:10","guid":{"rendered":"https:\/\/blog.coderfan.org\/?p=3440"},"modified":"2022-08-23T16:32:31","modified_gmt":"2022-08-23T08:32:31","slug":"some-tools-help-us-parse-object-file-in-linux","status":"publish","type":"post","link":"https:\/\/blog.coderfan.org\/en\/some-tools-help-us-parse-object-file-in-linux.html","title":{"rendered":"Linux\u7cfb\u7edf\u4e0b\u53ef\u6267\u884c\u6587\u4ef6\u89e3\u6790\u4e0e\u8c03\u8bd5\u5de5\u5177:readelf\/objdump\/nm"},"content":{"rendered":"<div class='booster-block booster-read-block'>\n                <div class=\"twp-read-time\">\n                \t<i class=\"booster-icon twp-clock\"><\/i> <span>Read Time:<\/span>1 Minute, 13 Second                <\/div>\n\n            <\/div>\n<blockquote class=\"wp-block-quote is-style-default is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>\u672c\u535a\u5ba2\u5185\u5bb9\u5c5e\u4e8e\u4e2a\u4eba\u539f\u521b\uff0c\u7531\u4e8e\u80fd\u529b\u6709\u9650\uff0c\u96be\u514d\u5b58\u6709\u9519\u8bef\uff0c\u8fd8\u8bf7\u5404\u4f4d\u4e0d\u541d\u6307\u6b63\u3002<\/strong><\/p><p><strong>\u5982\u9700\u8f6c\u8f7d\uff0c\u8bf7\u6ce8\u660e\u51fa\u5904\u3002<\/strong><\/p><\/blockquote>\n\n\n\n<p class=\"has-text-align-justify\">\u5bf9\u4e8eLinux\u6216\u8005Android\u7cfb\u7edf\u5f00\u53d1\u8005\u800c\u8a00\uff0c\u7ecf\u5e38\u4f1a\u4f7f\u7528\u4e00\u4e9b\u5171\u4eab\u5e93(.so\uff09\u3002\u800c\u5982\u679c\u4f60\u662fC\/C++\u5f00\u53d1\u8005\uff0c\u7c7b\u4f3c\u4e8e\u4e8c\u8fdb\u5236\u6587\u4ef6\uff08.bin\uff09,\u76ee\u6807\u6587\u4ef6(.o)\u4e5f\u4f1a\u7ecf\u5e38\u9047\u89c1\u3002\u6709\u4e9b\u65f6\u5019\u6211\u4eec\u9700\u8981\u501f\u52a9\u4e00\u4e9b\u5de5\u5177\u6765\u5e2e\u5fd9\u68c0\u6d4b\u8fd9\u4e9b\u6587\u4ef6\uff0c\u4ee5\u786e\u5b9a\u5176\u662f\u5426\u6ee1\u8db3\u6211\u4eec\u7684\u4f7f\u7528\u9700\u6c42\u3002\u5e38\u89c1\u7684\u573a\u666f\u5982\u4e0b:<\/p>\n\n\n\n<p class=\"has-text-align-justify\"><strong>\u4f60\u9700\u8981\u4e0e\u4eba\u5408\u4f5c\u5f00\u53d1\u67d0\u4e2a\u529f\u80fd\uff0c\u5f53\u53cc\u65b9\u7ea6\u5b9a\u597d\u63a5\u53e3\u540e\u5bf9\u65b9\u5c06\u4f1a\u4ee5.so\u7684\u5f62\u5f0f\u63d0\u4f9b\u53ef\u6267\u884c\u6587\u4ef6\uff0c\u800c\u4f60\u5219\u9700\u8981\u5f15\u7528\u8be5so\uff0c\u5728\u4f7f\u7528\u65f6\u5219\u901a\u8fc7\u63a5\u53e3\u8c03\u7528\u5b8c\u6210\u4ea4\u4e92\u3002\u90a3\u4e48\uff0c\u5f53\u4f60\u62ff\u5230\u5bf9\u65b9\u63d0\u4f9b\u7684so\u65f6\uff0c\u4f60\u9700\u8981\u5148\u68c0\u67e5\u8be5so\u662f\u5426\u6ee1\u8db3\u4f60\u7684\u4f7f\u7528\u9700\u6c42\uff0c\u4f60\u9700\u8981\u5173\u6ce8\u7684\u4fe1\u606f\u5305\u62ec\uff1a<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u8be5so\u5e93\u7684\u6a21\u5757\u540d<\/li><li>\u8be5so\u5e93\u63d0\u4f9b\u7684\u5f00\u653e\u63a5\u53e3<\/li><li>\u8be5so\u5e93\u81ea\u8eab\u6240\u4f9d\u8d56\u7684\u5e93<\/li><li>\u8be5so\u5e93\u7684\u8fd0\u884c\u73af\u5883\u7b49\u7b49<\/li><\/ul>\n\n\n\n<p class=\"has-text-align-justify\">\u5728\u8fd9\u79cd\u573a\u666f\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd0\u7528\u4e00\u4e9b\u5de5\u5177\u6765\u5bf9so\u5e93\u8fdb\u884c\u68c0\u6d4b\u3002\u4ee5\u4e0b\u662f\u6211\u4e2a\u4eba\u65e5\u5e38\u6bd4\u8f83\u559c\u6b22\u7684\u5de5\u5177\uff1a<\/p>\n\n\n\n<p><em><strong>1.readelf<\/strong>\u5de5\u5177<\/em><\/p>\n\n\n\n<p class=\"has-text-align-justify\">readelf\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u89e3\u6790ELF(Executable and Linkable Format\uff09\u6587\u4ef6\u7684\u5de5\u5177\uff0celf\u6587\u4ef6\u5305\u62ec.o\u6587\u4ef6\u3001.so\u6587\u4ef6.elf\u6587\u4ef6\u7b49\u3002\u5982\u679c\u4f60\u7684\u7cfb\u7edf\u5185\u672a\u5b89\u88c5readelf\u5de5\u5177\uff0c\u8bf7\u4f7f\u7528sudo apt install binutils\u547d\u4ee4\u8fdb\u884c\u5b89\u88c5\u3002\u5b89\u88c5\u540e\u53ef\u4ee5\u901a\u8fc7readelf &#8211;help\u547d\u4ee4\u67e5\u770b\u4f7f\u7528\u89c4\u5219\u3002\u5982\u679c\u4f60\u9700\u8981\u8be6\u7ec6\u7684\u8bf4\u660e\uff0c\u8bf7\u4f7f\u7528man readelf\u547d\u4ee4\u8fdb\u884c\u67e5\u770b\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u547d\u4ee4\u53c2\u6570\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>readelf -a *.so \/\/\u67e5\u770bso\u5e93\u7684\u6240\u6709\u4fe1\u606f\nreadelf -s *.so \/\/\u67e5\u770bso\u5e93\u63d0\u4f9b\u7684\u5916\u90e8\u63a5\u53e3\nreadelf -d *.so \/\/\u67e5\u770bso\u5e93\u63d0\u4f9b\u7684\u52a8\u6001\u4fe1\u606f<\/code><\/pre>\n\n\n\n<p class=\"has-text-align-justify\">\u90a3\u4e48\uff0c\u5728\u672c\u573a\u666f\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528readelf -d *.so\u67e5\u770bso\u5e93\u7684\u4e00\u4e9b\u57fa\u672c\u4fe1\u606f\uff0c\u5982\u4e0b\u6240\u793a\uff08\u793a\u4f8b\u4e2d\u7684so\u5e93\u4e3aUbantu\u4e2d\u968f\u4fbf\u627e\u7684\u4e00\u4e2a\uff09\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"405\" src=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d-1024x405.png\" alt=\"\" class=\"wp-image-3443\" srcset=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d-1024x405.png 1024w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d-300x119.png 300w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d-768x304.png 768w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d-18x7.png 18w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-d.png 1244w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">\u6211\u4eec\u9700\u8981\u5173\u6ce8\u7684\u5b57\u6bb5\u5305\u62ec\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><strong>NEEDED:<\/strong>\u8868\u660e\u8be5\u5e93\u6240\u4f9d\u8d56\u7684\u5e93\uff0c\u5982\u679c\u7cfb\u7edf\u4e2d\u4e0d\u5b58\u5728\u5176\u6240\u4f9d\u8d56\u7684\u5e93\uff0c\u662f\u65e0\u6cd5\u7f16\u8bd1\u6210\u529f\u7684\n<strong>SONAME:<\/strong>\u8868\u660e\u8be5so\u5e93\u7684\u6a21\u5757\u540d\u79f0\uff0c\u5982\u679c\u4f60\u5728\u7f16\u8bd1\u65f6\u5f15\u7528\u8be5so\u5e93\u7684\u540d\u79f0\u4e0e\u6b64\u4e0d\u4e00\u81f4\uff0c\u5219\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u5931\u8d25<\/code><\/pre>\n\n\n\n<p>\u6b64\u5916\uff0c\u4f7f\u7528readelf -s *.so\u67e5\u770bso\u5e93\u6240\u63d0\u4f9b\u7684\u5916\u90e8\u63a5\u53e3\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"371\" src=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s-1024x371.png\" alt=\"\" class=\"wp-image-3444\" srcset=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s-1024x371.png 1024w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s-300x109.png 300w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s-768x278.png 768w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s-18x7.png 18w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/read-s.png 1057w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u8be5\u547d\u4ee4\u67e5\u770bso\u5e93\u662f\u5426\u6309\u7167\u53cc\u65b9\u7684\u7ea6\u5b9a\u5b8c\u6210\u63a5\u53e3\uff0c\u5982\u679cso\u5e93\u4e2d\u672a\u63d0\u4f9b\u6240\u6709\u4f60\u9700\u8981\u7684\u63a5\u53e3\uff0c\u5728\u7f16\u8bd1\u65f6\u662f\u65e0\u6cd5\u901a\u8fc7\u7684\u3002<\/p>\n\n\n\n<p class=\"has-text-align-justify\">\u901a\u8fc7readelf -a *.so\u67e5\u770b\u66f4\u591a\u4fe1\u606f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"502\" src=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a-1024x502.png\" alt=\"\" class=\"wp-image-3445\" srcset=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a-1024x502.png 1024w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a-300x147.png 300w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a-768x376.png 768w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a-18x9.png 18w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/readelf-a.png 1043w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\"><strong><em>2.objdump\u5de5\u5177<\/em><\/strong><\/p>\n\n\n\n<p class=\"has-text-align-justify\">objdump\u662f\u4e00\u4e2a\u4e13\u95e8\u7528\u4e8e\u5206\u6790\u76ee\u6807\u6587\u4ef6(object files)\u7684\u5de5\u5177,\u4e0ereadelf\u4e00\u6837\uff0c\u5176\u53ef\u4ee5\u901a\u8fc7 sudo apt install binutils \u8fdb\u884c\u5b89\u88c5\u3002objdump\u76f8\u5bf9\u4e8ereadelf\u5e76\u4e0d\u662f\u90a3\u4e48\u597d\u7528\uff0c\u5176\u4e3b\u8981\u662f\u7528\u4e8e\u6c47\u7f16\u6307\u4ee4\u76f8\u5173\u4fe1\u606f\u7684\u67e5\u8be2\uff0c\u4f46\u662f\u5bf9\u4e8eso\u6211\u4eec\u8fd8\u662f\u53ef\u4ee5\u901a\u8fc7objdump\u5de5\u5177\u67e5\u8be2\u4e00\u4e9b\u4fe1\u606f\u3002\u5982\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"558\" src=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d-1024x558.png\" alt=\"\" class=\"wp-image-3446\" srcset=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d-1024x558.png 1024w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d-300x163.png 300w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d-768x418.png 768w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d-18x10.png 18w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/objdump-d.png 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">3<em><strong>.nm\u5de5\u5177<\/strong><\/em><\/p>\n\n\n\n<p class=\"has-text-align-justify\">nm\u4e5f\u662f\u4e00\u4e2a\u4eceobject files\u4e2d\u83b7\u53d6\u7b26\u53f7symbol\u7684\u5de5\u5177\uff0c\u4e0ereadelf\u548cobjdump\u76f8\u6bd4\uff0c\u5176\u529f\u80fd\u6ca1\u90a3\u4e48\u4e30\u5bcc\uff0c\u4f46\u662f\u6709\u4e00\u4e9b\u5dee\u5f02\u5316\u7684\u7279\u6027\u3002\u5176\u5e38\u7528\u7684\u53c2\u6570\u8868\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>nm &#91;-A|-o|--print-file-name] &#91;-a|--debug-syms]\n   &#91;-B|--format=bsd] &#91;-C|--demangle&#91;=style]]\n   &#91;-D|--dynamic] &#91;-f&lt;format&gt;|--format=&lt;format&gt;]\n   &#91;-g|--extern-only] &#91;-h|--help]\n   &#91;-l|--line-numbers] &#91;-n|-v|--numeric-sort]\n   &#91;-P|--portability] &#91;-p|--no-sort]\n   &#91;-r|--reverse-sort] &#91;-S|--print-size]\n   &#91;-s|--print-armap] &#91;-t &lt;radix&gt;|--radix=&lt;radix&gt;]\n   &#91;-u|--undefined-only] &#91;-V|--version]\n   &#91;-X 32_64] &#91;--defined-only] &#91;--no-demangle]\n   &#91;--plugin &lt;name&gt;] &#91;--size-sort] &#91;--special-syms]\n   &#91;--synthetic] &#91;--target=bfdname]\n   &#91;objfile...]\n<\/code><\/pre>\n\n\n\n<p class=\"has-text-align-justify\">\u5728\u65e5\u5e38\u4f7f\u7528\u4e2d\uff0c\u4e00\u822c\u4f7f\u7528-D\u53c2\u6570\u83b7\u53d6\u7b26\u53f7\u8868\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><img loading=\"lazy\" decoding=\"async\" width=\"969\" height=\"317\" src=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/nm-D.png\" alt=\"\" class=\"wp-image-3449\" srcset=\"https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/nm-D.png 969w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/nm-D-300x98.png 300w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/nm-D-768x251.png 768w, https:\/\/blog.coderfan.org\/wp-content\/uploads\/2021\/08\/nm-D-18x6.png 18w\" sizes=\"auto, (max-width: 969px) 100vw, 969px\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-justify\">\u4ee5\u4e0a\u5c31\u662f\u6211\u4eec\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u7528\u4e8e\u5e2e\u52a9\u6211\u4eec\u89e3\u6790\u53ef\u6267\u884c\u6587\u4ef6\u7684\u4e00\u4e9b\u5de5\u5177\u3002\u603b\u7ed3\u4e00\u4e0b\u8fd9\u4e09\u4e2a\u5de5\u5177\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>readelf\u529f\u80fd\u66f4\u5f3a\u5927\uff0c\u53ef\u4ee5\u67e5\u770b\u7684\u4fe1\u606f\u76f8\u5bf9\u6765\u8bf4\u66f4\u4e3a\u5168\u9762\u3002<\/li><li>objdump\u6bd4\u8f83\u9002\u5408\u4e8e\u5e95\u5c42\u8f6f\u4ef6\u76f8\u5173\u4eba\u5458\u4f7f\u7528\uff0c\u5176\u6bd4\u8f83\u8d34\u8fd1\u6c47\u7f16\u8bed\u8a00\uff0c\u53ef\u4ee5\u7528\u4e8e\u53cd\u6c47\u7f16\u3002<\/li><li>nm\u4e13\u6ce8\u4e8e\u53ef\u6267\u884c\u6587\u4ef6\u7684symbol\u7b26\u53f7\u67e5\u8be2\uff0c\u5bf9\u4e8esymbol\u7b26\u53f7\u7684\u89e3\u6790\u66f4\u4e3a\u8be6\u7ec6<\/li><\/ul>\n\n\n\n<p><\/p>\n        <div class=\"booster-block booster-reactions-block\">\n            <div class=\"twp-reactions-icons\">\n                \n                <div class=\"twp-reacts-wrap\">\n                    <a react-data=\"be-react-1\" post-id=\"3440\" class=\"be-face-icons un-reacted\" href=\"javascript:void(0)\">\n                        <img decoding=\"async\" src=\"https:\/\/blog.coderfan.org\/wp-content\/plugins\/booster-extension\/\/assets\/icon\/happy.svg\" alt=\"Happy\">\n                    <\/a>\n                    <div class=\"twp-reaction-title\">\n                        Happy                    <\/div>\n                    <div class=\"twp-count-percent\">\n                                                    <span style=\"display: none;\" class=\"twp-react-count\">1<\/span>\n                        \n                                                <span class=\"twp-react-percent\"><span>100<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                <div class=\"twp-reacts-wrap\">\n                    <a react-data=\"be-react-2\" post-id=\"3440\" class=\"be-face-icons un-reacted\" href=\"javascript:void(0)\">\n                        <img decoding=\"async\" src=\"https:\/\/blog.coderfan.org\/wp-content\/plugins\/booster-extension\/\/assets\/icon\/sad.svg\" alt=\"Sad\">\n                    <\/a>\n                    <div class=\"twp-reaction-title\">\n                        Sad                    <\/div>\n                    <div class=\"twp-count-percent\">\n                                                    <span style=\"display: none;\" class=\"twp-react-count\">0<\/span>\n                                                                        <span class=\"twp-react-percent\"><span>0<\/span> %<\/span>\n                                            <\/div>\n                <\/div>\n\n                <div class=\"twp-reacts-wrap\">\n                    <a react-data=\"be-react-3\" post-id=\"3440\" class=\"be-face-icons un-reacted\" href=\"javascript:void(0)\">\n                        <img decoding=\"async\" src=\"https:\/\/blog.coderfan.org\/wp-content\/plugins\/booster-extension\/\/assets\/icon\/excited.svg\" alt=\"Excited\">\n                    <\/a>\n                    <div class=\"twp-reaction-title\">\n                        Excited               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