{"id":105,"date":"2022-07-14T13:45:10","date_gmt":"2022-07-14T05:45:10","guid":{"rendered":"https:\/\/www.laning.cc\/?p=105"},"modified":"2025-03-28T11:10:32","modified_gmt":"2025-03-28T03:10:32","slug":"csapp%e5%ad%a6%e4%b9%a0%e7%ac%94%e8%ae%b0%ef%bc%88%e6%8c%81%e7%bb%ad%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/blog.laning.org\/index.php\/2022\/07\/14\/105\/","title":{"rendered":"CSAPP\u5b66\u4e60\u7b14\u8bb0"},"content":{"rendered":"

\u6df1\u5165\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\uff08C\u8bed\u8a00\u3001\u6570\u636e\u7ed3\u6784\u3001\u5fae\u5d4c\u3001\u7f16\u8bd1\u539f\u7406\u3001\u6570\u7535\u3001\u6a21\u7535\uff09<\/span><\/h1>\n

\u7b2c\u4e00\u7ae0\uff1a\u8ba1\u7b97\u673a\u7cfb\u7edf\u6f2b\u6e38<\/span><\/h2>\n

\u7f16\u8bd1\u7cfb\u7edf<\/span><\/p>\n

hello.c->hello.i<\/span><\/p>\n

gcc<\/span> -E<\/span> hello.c -o<\/span> hello.i<\/span><\/pre>\n
hello.i->hello.s<\/span><\/p>\n
gcc<\/span> -S<\/span> hello.i -o<\/span> hello.s<\/span><\/pre>\n
hello.s->hello.o<\/span><\/p>\n
gcc<\/span> -c<\/span> hello.s -o<\/span> hello.o<\/span><\/pre>\n
hello.o->hello<\/span><\/p>\n
gcc<\/span> hello.o -o<\/span> hello<\/span><\/pre>\n
\u7b2c\u4e8c\u7ae0\uff1a\u4fe1\u606f\u7684\u8868\u793a\u548c\u5904\u7406<\/span><\/h2>\n
\/\/\u6570\u636e\u5728\u4e0d\u540c\u67b6\u6784\u5904\u7406\u5668\u4e0b\u7684\u8868\u793a<\/span><\/span>\n#include <stdio.h><\/span><\/span>\n\u200b<\/span>\ntypedef<\/span> unsigned<\/span> char<\/span> *<\/span> byte_pointer<\/span>;<\/span>\n\u200b<\/span>\nvoid<\/span> show_bytes<\/span>(byte_pointer<\/span> start<\/span>, size_t<\/span> led<\/span>)<\/span>\n{<\/span>\n \u00a0size_t<\/span> i<\/span>;<\/span>\n \u00a0for<\/span> (i<\/span> =<\/span> 0<\/span> ;i<\/span> <<\/span> led<\/span>; i<\/span>++<\/span>)<\/span>\n  {<\/span>\n \u00a0 \u00a0printf<\/span>(\"%.2x\"<\/span>,start<\/span>[i<\/span>]);<\/span>\n  }<\/span>\n \u00a0printf<\/span>(\"\\n\"<\/span>);<\/span>\n}<\/span>\n\u200b<\/span>\nvoid<\/span> show_int<\/span>(int<\/span> x<\/span>)<\/span>\n{<\/span>\n \u00a0show_bytes<\/span>((byte_pointer<\/span>)&<\/span>x<\/span>,sizeof<\/span>(int<\/span>));<\/span>\n}<\/span>\n\u200b<\/span>\nvoid<\/span> show_float<\/span>(float<\/span> x<\/span>)<\/span>\n{<\/span>\n \u00a0show_bytes<\/span>((byte_pointer<\/span>)&<\/span>x<\/span>,sizeof<\/span>(float<\/span>));<\/span>\n}<\/span>\n\u200b<\/span>\nvoid<\/span> show_pointer<\/span>(void<\/span> *<\/span>x<\/span>)<\/span>\n{<\/span>\n \u00a0show_bytes<\/span>((byte_pointer<\/span>)&<\/span>x<\/span>,sizeof<\/span>(void<\/span> *<\/span>));<\/span>\n}<\/span>\n\u200b<\/span>\nint<\/span> main<\/span>()<\/span>\n{<\/span>\n \u00a0int<\/span> i<\/span> =<\/span>12345<\/span>;<\/span>\n \u00a0show_int<\/span>(i<\/span>);<\/span>\n \u00a0return<\/span> 0<\/span>;<\/span>\n}<\/span><\/pre>\n
\u6574\u6570\u3001\u6d6e\u70b9\u6570\u5728\u8ba1\u7b97\u673a\u5185\u90e8\u7684\u8868\u793a\u4e0e\u8fd0\u7b97<\/span><\/h3>\n
\u7b2c\u4e09\u7ae0\uff1a\u7a0b\u5e8f\u7684\u673a\u5668\u7ea7\u8868\u793a<\/span><\/h2>\n
while\u3001do-while\u3001for\u6027\u80fd\u5206\u6790<\/span><\/h3>\n
\u4e09\u79cd\u90fd\u662f\u901a\u8fc7\u6761\u4ef6\u6d4b\u8bd5\u548c\u8df3\u8f6c\u6307\u4ee4\u5b9e\u73b0\u7684\u3002<\/span><\/p>\n
switch\u3001if-else\u6027\u80fd\u5206\u6790<\/span><\/h3>\n
switch\u901a\u8fc7\u4e00\u4e2a\u8df3\u8f6c\u8868\u5b9e\u73b0\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u6267\u884c\u4e00\u6b21\u8df3\u8f6c\uff0c\u800cif-else\u9700\u8981\u591a\u6b21\u8df3\u8f6c\u6307\u4ee4\uff0c\u4ee3\u7801\u6548\u7387\u76f8\u5bf9\u4f4e\u3002<\/span><\/p>\n
\u5806\u6808\u7684\u5206\u6790\u5bf9\u6bd4<\/span><\/h3>\n
\u5806\uff1a\u4e00\u822c\u7531\u7a0b\u5e8f\u5458\u7533\u8bf7\u63a7\u5236\uff0c\u5982C\u8bed\u8a00\u7684malloc,\u5730\u5740\u7531\u5c0f\u5230\u5927\u589e\u957f\uff0c\u6ee1\u8db3\u540e\u5165\u5148\u51fa\u7684\u539f\u5219\u3002\u9700\u8981\u7a0b\u5e8f\u5458\u81ea\u8eab\u63a7\u5236\u5185\u5b58\u7684\u5206\u914d\u95ee\u9898\u3002\u4e00\u822c\u6808\u7684\u7a7a\u95f4\u6709\u9650\u3002<\/span><\/p>\n
\u6808\uff1a\u4e00\u822c\u7531\u7cfb\u7edf\u63a7\u5236\uff0c\u5982int a\u8fd9\u79cd\u8bed\u53e5\uff0c\u5730\u5740\u7531\u5927\u5230\u5c0f\u9012\u51cf\uff0c\u4e5f\u6ee1\u8db3\u540e\u5165\u5148\u51fa\u7684\u539f\u5219\u3002\u6211\u4eecC\u8bed\u8a00\u6267\u884c\u4e00\u4e2a\u51fd\u6570\u5c31\u662f\u5728\u6808\u4e2d\u5f00\u8f9f\u7a7a\u95f4\u6267\u884c\uff0c\u6545\u51fd\u6570\u6267\u884c\u5b8c\u6bd5\uff0c\u4f1a\u81ea\u52a8\u91ca\u653e\u5185\u5b58\u7a7a\u95f4\u3002\u5806\u7684\u7a7a\u95f4\u76f8\u5bf9\u8f83\u5927\u3002<\/span><\/p>\n
\u5bf9\u6297\u7f13\u51b2\u533a\u6ea2\u51fa\u653b\u51fb<\/span><\/h3>\n
    \n
  1. \n
    \u6808\u968f\u673a\u5316\uff1a\u6bcf\u6b21\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u7a0b\u5e8f\u6808\u4f4d\u7f6e\u968f\u673a\uff0c\u4e0d\u5bb9\u6613\u88ab\u9ed1\u5ba2\u8fdb\u884c\u6f0f\u6d1e\u53d1\u6398\u3002<\/span><\/p>\n<\/li>\n
  2. \n
    \u6808\u7834\u574f\u68c0\u6d4b\uff1a\u5728\u7f13\u51b2\u533a\u548c\u6808\u4fdd\u5b58\u7684\u72b6\u6001\u503c\u4e4b\u95f4\u5b58\u50a8\u4e00\u4e2a\u7279\u6b8a\u503c\uff0c\u6210\u4e3a\u91d1\u4e1d\u96c0\u503c\uff08\u968f\u673a\u4ea7\u751f<\/span><\/p>\n<\/li>\n
  3. \n
    \u9650\u5236\u53ef\u6267\u884c\u4ee3\u7801\u533a\u57df\uff1a\u9650\u5236\u5185\u5b58\u533a\u57df\u5b58\u653e\u53ef\u6267\u884c\u4ee3\u7801\u8303\u56f4<\/span><\/p>\n<\/li>\n<\/ol>\n
    \u7b2c\u56db\u7ae0\uff1a\u5904\u7406\u5668\u4f53\u7cfb\u7ed3\u6784<\/span><\/h2>\n
    \u53c2\u8003\u5fae\u5d4c\u3001\u6570\u7535\u3001\u6a21\u7535<\/span><\/p>\n
    \u7b2c\u4e94\u7ae0\uff1a\u4f18\u5316\u7a0b\u5e8f\u6027\u80fd<\/span><\/h2>\n
    \u7f16\u5199\u9ad8\u6548\u7684\u7a0b\u5e8f<\/span><\/h3>\n
      \n
    1. \n
      \u9009\u62e9\u5408\u9002\u7684\u7b97\u6cd5\u548c\u6570\u636e\u7ed3\u6784<\/span><\/p>\n
      \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u51cf\u5c11\u51fd\u6570\u8c03\u7528\u7684\u5f00\u9500<\/span><\/p>\n<\/li>\n
    2. \n
      \u4e86\u89e3\u7f16\u8bd1\u5668\u7684\u80fd\u529b\u548c\u5c40\u9650\u6027<\/span><\/p>\n<\/li>\n
    3. \n
      \u63a2\u7d22\u5e76\u884c\u5316<\/span><\/p>\n<\/li>\n<\/ol>\n
      \u6295\u673a\u6267\u884c<\/span><\/h3>\n
      \u6307\u7a0b\u5e8f\u6267\u884c\u65f6\uff0c\u9047\u5230\u5206\u652f\u7ed3\u6784\uff0c\u8ba1\u7b97\u673a\u4f1a\u9884\u6d4b\u5206\u652f\u7ed3\u679c\uff0c\u751a\u81f3\u76f4\u63a5\u6267\u884c\u67d0\u4e2a\u5206\u652f\u7684\u4ee3\u7801\u3002\u5982\u679c\u9884\u6d4b\u6b63\u786e\uff0c\u5219\u5c06\u6267\u884c\u7ed3\u679c\u9001\u5230\u5bc4\u5b58\u5668\u4e2d\uff0c\u5931\u8d25\u5219\u4e22\u5f03\u3002\u6b64\u5904\u7531\u5206\u652f\u6a21\u5757\u6765\u63a7\u5236\u3002<\/span><\/p>\n
      \u7b2c\u516d\u7ae0\uff1a\u5b58\u50a8\u5668\u5c42\u6b21\u7ed3\u6784<\/span><\/h2>\n
      \u5b58\u50a8\u6280\u672f<\/span><\/h3>\n
      \u5bc4\u5b58\u5668—\u7f13\u5b58\uff08cache\uff09—\u4e3b\u5b58—\u5916\u5b58<\/span><\/p>\n
        \n
      1. \n
        \u7f13\u5b58\uff1a\u53ef\u4ee5\u5b58\u5728\u591a\u7ea7\u7f13\u5b58\u7ed3\u6784\uff0c\u4e3a\u9759\u6001\u968f\u673a\u8bbf\u95ee\u5b58\u50a8\u5668\uff08SRAM\uff09\uff0c\u7528\u53cc\u7a33\u6001\u7535\u8def\u903b\u8f91\u72b6\u6001\u6765\u5b58\u50a8\u4fe1\u606f\u3002<\/span><\/p>\n<\/li>\n
      2. \n
        \u4e3b\u5b58\uff1a\u4e3a\u52a8\u6001\u968f\u673a\u8bbf\u95ee\u5b58\u50a8\u5668\uff08DRAM\uff09\uff0c\u7528\u7535\u5bb9\u5145\u653e\u7535\u6765\u5b58\u50a8\u4fe1\u606f\uff0c\u9700\u8981\u4e0d\u65ad\u5237\u65b0\u6765\u4fdd\u6301\u4fe1\u606f\u3002SDRAM\u540c\u6b65\u52a8\u6001\u968f\u673a\u8bbf\u95ee\u5b58\u50a8\u5668\u901f\u5ea6\u4f18\u4e8eDDRAM\u3002<\/span><\/p>\n<\/li>\n
      3. \n
        \u5916\u5b58\uff1a<\/span><\/p>\n
          \n
        • \n
          \u78c1\u76d8\uff08\u673a\u68b0\u786c\u76d8\uff09<\/span><\/p>\n
          \u78c1\u7247\u3001\u78c1\u9762\u3001\u78c1\u9053\u3001521\u5b57\u8282\u3001\u6247\u533a\u3001\u8bfb\/\u5199\u5934<\/span><\/p>\n
          \u78c1\u76d8\u53d6\u51b3\u4e8e\u5bfb\u9053\u65f6\u95f4+\u65cb\u8f6c\u65f6\u95f4\uff08\u8f6c\u901f\uff09+\u4f20\u9001\u65f6\u95f4<\/span><\/p>\n<\/li>\n
        • \n
          \u56fa\u6001\u786c\u76d8\uff08flash\uff09<\/span><\/p>\n
          \u95ea\u5b58\u82af\u7247\uff08plane\u3001block\u3001page\uff09<\/span><\/p>\n
          \u8bfb\u3001\u5199\u3001\u64e6\u9664\uff0c\u53ea\u80fd\u5c061\u6539\u4e3a0\uff0c\u4e0d\u80fd\u5c060\u6539\u4e3a1<\/span><\/p>\n
          \u5199\u4ee5page\u4e3a\u5355\u4f4d\uff0c\u64e6\u9664\u4ee5block\u4e3a\u5355\u4f4d<\/span><\/p>\n
          \n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n
          \u5c40\u90e8\u6027<\/span><\/h3>\n
            \n
          • \n
            \u65f6\u95f4\u5c40\u90e8\u6027\uff0c\u6307\u540c\u4e00\u53d8\u91cf\u5728\u4e00\u6bb5\u65f6\u95f4\u88ab\u591a\u6b21\u8bbf\u95ee<\/span><\/p>\n<\/li>\n
          • \n
            \u7a7a\u95f4\u5c40\u90e8\u6027\uff0c\u6307\u8bbf\u95ee\u5728\u4e00\u6bb5\u8fde\u7eed\u7684\u7a7a\u95f4\u5185\uff0c\u5982\u6570\u7ec4\u7684\u987a\u5e8f\u8bbf\u95ee <\/span><\/p>\n
            \u5408\u7406\u5229\u7528\u5c40\u90e8\u6027\u539f\u7406\uff0c\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5e8f\u6267\u884c\u901f\u5ea6<\/span><\/p>\n<\/li>\n<\/ul>\n
            \u5b58\u50a8\u5668\u5c42\u6b21\u7ed3\u6784<\/span><\/h3>\n
            \u4e2d\u5fc3\u601d\u60f3\uff1a\u901f\u5ea6\u66f4\u5feb\u3001\u5bb9\u91cf\u66f4\u5c0f\u7684\u5b58\u50a8\u8bbe\u5907\u4f5c\u4e3a\u901f\u5ea6\u66f4\u6162\u3001\u5bb9\u91cf\u66f4\u5927\u7684\u5b58\u50a8\u8bbe\u5907\u7684\u7f13\u5b58<\/span><\/p>\n
            \u76f8\u90bb\u5b58\u50a8\u5668\u5c42\u6b21\u7ed3\u6784\u4e4b\u95f4\u5757\u7684\u5927\u5c0f\u901a\u5e38\u4e00\u81f4\u3002<\/span><\/p>\n
            \u51e0\u4e2a\u6982\u5ff5\uff1a<\/span><\/p>\n
              \n
            1. \n
              \u7f13\u5b58\u547d\u4e2d\uff1a\u9700\u8981\u4f7f\u7528k+1\u5c42\u6570\u636e\u65f6\uff0c\u9700\u8981\u5148\u68c0\u7d22k\u5c42\u6570\u636e\uff0c\u5982\u679c\u5728k\u5c42\u6709\u7f13\u5b58\u7684\u6570\u636e\uff0c\u5219\u4e3a\u547d\u4e2d\u3002<\/span><\/p>\n<\/li>\n
            2. \n
              cache\u7684\u5185\u90e8\u7ed3\u6784\uff1a\u5185\u90e8\u4e3a\u4e00\u4e2a\u6216\u591a\u4e2aset\uff08\u7ec4\uff09{S}\uff1b\u6bcf\u4e2aset\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2acache line{E}\uff1b\u6bcf\u4e2acache\u7531\u4e09\u90e8\u5206\u7ec4\u6210\uff0c\u5206\u522b\u4e3a\u6709\u6548\u4f4d\uff081 bit\uff0c\u8868\u793a\u5f53\u524dcache line\u7684\u6570\u636e\u662f\u5426\u6709\u6548\uff0c1\u6709\u6548\uff09\u3001\u6807\u8bb0\u3001\u6570\u636e\u5757\uff08\u5185\u5b58\u6570\u636e\u7684\u526f\u672c\uff09{B}\uff0c\u6570\u636e\u5757\u4e2d\u524d\u51e0\u4f4d\u8868\u793a\u5730\u5740{m}\u3002 <\/span><\/p>\n
              \n<\/li>\n<\/ol>\n
              \u76f4\u63a5\u6620\u5c04\u9ad8\u901f\u7f13\u5b58<\/span><\/h3>\n
              \u5f53cache\u7684\u6bcf\u4e2a\u7ec4\u53ea\u6709\u4e00\u4e2acache line\u65f6\uff0c\u79f0\u4e3a\u76f4\u63a5\u6620\u5c04\u3002<\/span><\/p>\n
              \u8bfb\u53d6\u6570\u636e\u7684\u8fc7\u7a0b<\/span><\/p>\n
                \n
              1. \n
                \u7ec4\u9009\u62e9\uff0c\u6839\u636e\u7ec4\u7d22\u5f15\u4f4d\uff0c\u9009\u62e9\u7ec4<\/span><\/p>\n<\/li>\n
              2. \n
                \u884c\u5339\u914d\uff0c\u5bf9\u6bd4cache line\u4e2d\u7684\u6807\u8bb0\u548c\u5730\u5740\u4e2d\u7684\u6807\u8bb0\u662f\u5426\u4e00\u81f4\uff0c\u5982\u679c\u4e00\u81f4\uff0c\u8868\u793a\u6570\u636e\u4e00\u5b9a\u5728\u5f53\u524dcache line\u4e2d\uff0c\u5982\u679c\u6709\u6548\u4f4d\u4e3a0\u6216\u6807\u8bb0\u4e0d\u5339\u914d\uff0c\u5219\u76ee\u6807\u6570\u636e\u4e0d\u5728\u6b21cache line\u4e2d\u3002<\/span><\/p>\n<\/li>\n
              3. \n
                \u5b57\u62bd\u53d6\uff0c\u5757\u504f\u79fb\u51b3\u5b9a\u76ee\u6807\u6570\u636e\u5728\u6570\u636e\u5757\u4e2d\u7684\u4f4d\u7f6e\u3002<\/span><\/p>\n<\/li>\n<\/ol>\n
                \u7ec4\u76f8\u8054\/\u9ad8\u901f\u7f13\u5b58<\/span><\/h3>\n
                \u7b2c\u4e03\u7ae0\uff1a \u94fe\u63a5<\/span><\/h2>\n
                \u94fe\u63a5<\/span><\/h3>\n
                \u94fe\u63a5\u662f\u6307\u5c06\u53ef\u91cd\u5b9a\u4f4d\u76ee\u6807\u6587\u4ef6\u4ee5\u53ca\u6240\u5fc5\u8981\u7684\u7cfb\u7edf\u6587\u4ef6\u7ec4\u5408\u8d77\u6765\uff0c\u751f\u6210\u4e00\u4e2a\u53ef\u6267\u884c\u76ee\u6807\u6587\u4ef6\u7684\u64cd\u4f5c\u3002<\/span><\/p>\n
                \u53ef\u91cd\u5b9a\u4f4d\u76ee\u6807\u6587\u4ef6<\/span><\/h3>\n
                \u6bcf\u4e00\u4e2a\u53ef\u91cd\u5b9a\u4f4d\u76ee\u6807\u6587\u4ef6\u5927\u81f4\u5206\u4e3a3\u90e8\u5206\uff1a<\/span><\/p>\n
                  \n
                1. \n
                  ELF header\uff1a\uff08ELF\u662f\u53ef\u6267\u884c\u53ef\u94fe\u63a5\u683c\u5f0f\u7684\u7f29\u5199\uff09<\/span><\/p>\n
                  gcc<\/span> -c<\/span> hello.c -o<\/span> hello.o<\/span>\n#\u67e5\u770bhello.o\u7684\u5b57\u8282\u6570<\/span><\/span>\nwc<\/span> -c<\/span> hello.o<\/span>\n#\u67e5\u770bhello.o\u7684EFL header\u4fe1\u606f<\/span><\/span>\nreadelf -h<\/span> hello.o<\/span><\/pre>\n
                  \"\"<\/div><\/span><\/p>\n
                  Magic\u5b57\u6bb5\u89e3\u91ca\uff1a<\/span><\/p>\n
                  \"\"<\/div><\/span><\/p>\n
                  Type\u5b57\u6bb5\uff1aREL\u8868\u793a\u4e3a\u53ef\u91cd\u5b9a\u4f4d\u6587\u4ef6<\/span><\/p>\n<\/li>\n
                2. \n
                  Section\uff1a<\/span><\/p>\n
                    \n
                  • \n
                    .text\uff1a\u5b58\u653e\u5df2\u7ecf\u7f16\u8bd1\u597d\u7684\u673a\u5668\u4ee3\u7801<\/span><\/p>\n<\/li>\n
                  • \n
                    .data\uff1a\u5b58\u653e\u5df2\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\u7684\u503c<\/span><\/p>\n<\/li>\n
                  • \n
                    rodata\uff1a\u5b58\u653e\u53ea\u8bfb\u6570\u636e\uff08printf\u7684\u683c\u5f0f\u4e32\u548cswitch\u8bed\u53e5\u4e2d\u7684\u8df3\u8f6c\u8868\uff09<\/span><\/p>\n<\/li>\n
                  • \n
                    .bss\uff1a\u5b58\u653e\u672a\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\uff08\u88ab\u521d\u59cb\u5316\u4e3a0\u7684\u5168\u5c40\u53d8\u91cf\u548c\u9759\u6001\u53d8\u91cf\uff09\uff08\u5e76\u4e0d\u5360\u7528\u5b9e\u9645\u7a7a\u95f4\uff0c\u662f\u4e00\u4e2a\u5360\u4f4d\u7b26\uff09<\/span><\/p>\n<\/li>\n
                  • \n
                    .comment\uff1a\u5b58\u653e\u7684\u662f\u7f16\u8bd1\u5668\u7684\u7248\u672c\u4fe1\u606f<\/span><\/p>\n<\/li>\n
                  • \n
                    .symtab\uff1aSymbol Table\uff0c\u7b26\u53f7\u8868<\/span><\/p>\n
                    readelf -s<\/span> hello.o\n
                    \"\"<\/div>\n<\/span><\/pre>\n
                      \n
                    • \n
                      \u5168\u90e8\u7b26\u53f7\uff1a\u7531\u8be5\u6a21\u5757\u5b9a\u4e49\uff0c\u540c\u65f6\u80fd\u88ab\u5176\u4ed6\u6a21\u5757\u5f15\u7528<\/span><\/p>\n<\/li>\n
                    • \n
                      \u5916\u90e8\u7b26\u53f7\uff1a\u7531\u5176\u4ed6\u6a21\u5757\u5b9a\u4e49\uff0c\u540c\u65f6\u88ab\u8be5\u6a21\u5757\u5f15\u7528<\/span><\/p>\n<\/li>\n
                    • \n
                      \u5c40\u90e8\u7b26\u53f7\uff1a\u53ea\u80fd\u5728\u8be5\u6a21\u5757\u5b9a\u4e49\u3001\u4f7f\u7528<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n
                    • \n
                      .rel.text\uff1aRelocation Table\uff0c\u91cd\u5b9a\u4f4d\u8868<\/span><\/p>\n<\/li>\n
                    • \n
                      .debug\uff1a\u8c03\u8bd5\u4fe1\u606f<\/span><\/p>\n<\/li>\n
                    • \n
                      .line\uff1a\u539f\u59cbC\u7a0b\u5e8f\u7684\u884c\u53f7\u548c.text section\u4e2d\u673a\u5668\u6307\u4ee4\u4e4b\u95f4\u7684\u6620\u5c04<\/span><\/p>\n<\/li>\n
                    • \n
                      .strtab\uff1aString Table\uff0c\u5b57\u7b26\u4e32\u8868<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n
                    • \n
                      \u4ee5\u53caSection\u7684\u8868\uff1a<\/span><\/p>\n
                      readelf -S<\/span> hello.o<\/span><\/pre>\n<\/li>\n<\/ol>\n
                      \"\"<\/div><\/p>\n
                      \u7b26\u53f7\u89e3\u6790<\/span><\/h3>\n
                        \n
                      • \n
                        \u5f3a\u7b26\u53f7\uff1a\u51fd\u6570\u548c\u5df2\u7ecf\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf<\/span><\/p>\n<\/li>\n
                      • \n
                        \u5f31\u7b26\u53f7\uff1a\u672a\u521d\u59cb\u5316\u7684\u5168\u5c40\u53d8\u91cf<\/span><\/p>\n<\/li>\n<\/ul>\n
                        \u5f3a\u7b26\u53f7\u4e0e\u5f31\u7b26\u53f7\uff0c\u5f53\u6709\u540c\u540d\u5f3a\u7b26\u53f7\u65f6\uff0c\u94fe\u63a5\u65f6\u4f1a\u62a5\u9519\uff1b\u800c\u540c\u540d\u5f3a\u3001\u5f31\u5171\u5b58\u65f6\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u51fa\u73b0\u610f\u60f3\u4e0d\u5230\u7684\u9519\u8bef\u3002<\/span><\/p>\n
                        \u9759\u6001\u5e93<\/span><\/h3>\n
                        archive\u6587\u4ef6\u662f\u4e00\u7ec4\u53ef\u91cd\u5b9a\u4f4d\u76ee\u6807\u6587\u4ef6\u7684\u96c6\u5408\uff0c\u5728Linux\u4e2d\u4ee5.a\u7ed3\u5c3e<\/span><\/p>\n
                        libc.a\u5305\u542batoi\u3001printf\u3001scanf\u3001strcpy\u3001rand<\/span><\/p>\n
                        \u6784\u9020\u9759\u6001\u5e93<\/span><\/h4>\n
                        ar rcs \u5e93\u540d.a ***.o ***.o<\/span><\/pre>\n
                        \u89e3\u5305\u9759\u6001\u5e93<\/span><\/h4>\n
                        ar -x<\/span> \u5e93\u540d.a<\/span><\/pre>\n
                        \u9759\u6001\u5e93\u7684\u7528\u6cd5<\/span><\/h4>\n
                          \n
                        1. \n
                          \u5c06\u6240\u9700\u6a21\u5757\u7f16\u8bd1\u6210.o\u6587\u4ef6<\/span><\/p>\n<\/li>\n
                        2. \n
                          \u5c06\u7f16\u8bd1\u6210\u7684.o\u6587\u4ef6\u901a\u8fc7ar\u547d\u4ee4\u6253\u5305\u6210.a\u6587\u4ef6<\/span><\/p>\n<\/li>\n
                        3. \n
                          \u7f16\u5199\u6a21\u5757\u51fd\u6570\u7684\u58f0\u660e\u6587\u4ef6.h\uff0c\u5e76\u5728\u4e3b\u6a21\u5757\u4e2dinclude\u6b64\u6587\u4ef6\uff0c\u5373\u53ef\u5728\u4e3b\u6587\u4ef6\u4e2d\u8c03\u7528\u6b64\u51fd\u6570<\/span><\/p>\n<\/li>\n
                        4. \n
                          \u4f7f\u7528gcc\u7f16\u8bd1\u4e3b\u6a21\u5757\u65f6\uff0c\u5728\u540e\u9762\u6dfb\u52a0.a\u6587\u4ef6\u8def\u5f84\u5373\u53ef\u5b8c\u6210\u94fe\u63a5<\/span><\/p>\n<\/li>\n<\/ol>\n
                          \u9759\u6001\u5e93\u7684\u89e3\u6790\u8fc7\u7a0b<\/span><\/h4>\n
                          gcc<\/span> -static<\/span> main.o -o<\/span> main .\/test.a<\/span><\/pre>\n
                          \u94fe\u63a5\u5668\u5148\u5904\u7406main.o\uff0c\u7136\u540e\u5904\u7406test.a\uff0c\u6700\u540e\u5904\u7406libc.a\uff0c\u6587\u4ef6\u8f93\u5165\u987a\u5e8f\u975e\u5e38\u91cd\u8981\uff0c\u4e00\u822c\u5e93\u653e\u5728\u547d\u4ee4\u7ed3\u5c3e\uff0c\u5982\u679c\u5e93\u4e0d\u662f\u72ec\u7acb\u7684\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u6392\u5e8f\u64cd\u4f5c\u3002\uff08\u88ab\u8c03\u7528\u7684\u5e93\u5728\u540e\uff0c\u76f8\u4e92\u5f15\u7528\u53ef\u591a\u6b21\u5199\u660e\u9759\u6001\u5e93\uff09<\/span><\/p>\n
                          \u91cd\u5b9a\u4f4d<\/span><\/h3>\n
                            \n
                          1. \n
                            \u91cd\u5b9a\u4f4d\u8282\u548c\u7b26\u53f7\u5b9a\u4e49<\/span><\/p>\n<\/li>\n
                          2. \n
                            \u91cd\u5b9a\u4f4d\u8282\u4e2d\u7684\u7b26\u53f7\u5f15\u7528<\/span><\/p>\n<\/li>\n<\/ol>\n
                            \u53ef\u6267\u884c\u76ee\u6807\u6587\u4ef6<\/span><\/h3>\n
                            \u4e0e\u53ef\u91cd\u5b9a\u4f4d\u76ee\u6807\u6587\u4ef6\u7c7b\u4f3c<\/span><\/p>\n
                            \u4ee3\u7801\u8fd0\u884c\u65f6\u5185\u5b58\u5206\u5e03\uff1a<\/span><\/p>\n
                            \u5728Linux_x86_64\u4f4d\u7cfb\u7edf\u4e0a\uff0c\u4ee3\u7801\u6bb5\u4ece\u5730\u57400x4000000\u5f00\u59cb\uff0c\u7136\u540e\u5411\u4e0a\u4e3a\u6570\u636e\u6bb5\uff0c\u5806\u5728\u6570\u636e\u6bb5\u4e4b\u4e0a\uff0c\u7136\u540e\u662f\u5171\u4eab\u533a\u57df\uff0c\u5171\u4eab\u533a\u57df\u4e4b\u4e0a\u4e3a\u6808\uff08\u8d77\u59cb\u5730\u5740\u4e3a2<\/span>48<\/span><\/sup> -1\uff09\uff0c\u5176\u4e0a\u4e3a\u64cd\u4f5c\u7cfb\u7edf\u4fdd\u7559\u3002<\/span><\/p>\n
                            \"\"<\/div><\/p>\n
                            \"\"<\/div><\/p>\n
                            \u52a8\u6001\u94fe\u63a5\u5171\u4eab\u5e93<\/span><\/h3>\n
                            \u9759\u6001\u5e93\u5c40\u9650\u6027<\/span><\/h4>\n
                              \n
                            1. \n
                              \u9759\u6001\u5e93\u9700\u8981\u5b9a\u671f\u7ef4\u62a4\u548c\u66f4\u65b0<\/span><\/p>\n<\/li>\n
                            2. \n
                              \u51e0\u4e4e\u706d\u4e2aC\u7a0b\u5e8f\u90fd\u9700\u8981\u4f7f\u7528\u6807\u51c6\u7684I\/O\u51fd\u6570<\/span><\/p>\n<\/li>\n<\/ol>\n
                              \u5171\u4eab\u5e93<\/span><\/h4>\n
                              \u5728Linux\u7cfb\u7edf\u4e2d\u4ee5.so\u7ed3\u5c3e\u8868\u793a\uff0c\u5728Windows\u4e2d\u4ee5.dll\u7ed3\u5c3e\u8868\u793a\u3002<\/span><\/p>\n
                              \u6784\u9020\u5171\u4eab\u5e93<\/span><\/h5>\n
                              gcc<\/span> -shared<\/span> -fpic<\/span> -o<\/span> \u5171\u4eab\u5e93\u540d.so \u00a0 ***.o ***.o<\/span><\/pre>\n
                              \u5e94\u7528<\/span><\/h5>\n
                                \n
                              1. \n
                                \u5206\u53d1\u8f6f\u4ef6\uff0c\u56e0\u4e3a\u5171\u4eab\u5e93\u5728\u94fe\u63a5\u8fc7\u7a0b\u4e2d\uff0c\u4e0d\u662f\u771f\u6b63\u4e0e\u4e3b\u7a0b\u5e8f\u94fe\u63a5\u5728\u4e00\u8d77\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u5347\u7ea7\u52a8\u6001\u5e93\uff0c\u5728\u91cd\u65b0\u6267\u884c\u7a0b\u5e8f\u65f6\uff0c\u5c31\u53ef\u4ee5\u5b8c\u6210\u7a0b\u5e8f\u5347\u7ea7\u3002<\/span><\/p>\n<\/li>\n
                              2. \n
                                \u6784\u5efa\u9ad8\u6027\u80fdWeb\u670d\u52a1\u5668\uff0c\u65e0\u9700\u5173\u95ed\u6216\u91cd\u542f\u670d\u52a1\u5c31\u80fd\u5b9e\u73b0\u5347\u7ea7<\/span><\/p>\n
                                #\u5728C\u7a0b\u5e8f\u4e2d\u52a8\u6001\u52a0\u8f7d\u5171\u4eab\u5e93<\/span><\/span>\nhandle<\/span> =<\/span> dlopen<\/span>(\".\/***.so\"<\/span>,RTLD_LAZY<\/span>)<\/span><\/pre>\n
                                \n<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
                                \u6df1\u5165\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\uff08C\u8bed\u8a00\u3001\u6570\u636e\u7ed3\u6784\u3001\u5fae\u5d4c\u3001\u7f16\u8bd1\u539f\u7406\u3001\u6570\u7535\u3001\u6a21\u7535\uff09 \u7b2c\u4e00\u7ae0\uff1a\u8ba1\u7b97\u673a\u7cfb\u7edf\u6f2b\u6e38 \u7f16\u8bd1\u7cfb\u7edf hell […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"yoast_head":"\nCSAPP\u5b66\u4e60\u7b14\u8bb0 – Laning 's Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.laning.org\/index.php\/2022\/07\/14\/105\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"CSAPP\u5b66\u4e60\u7b14\u8bb0 – Laning 's Blog\" \/>\n<meta property=\"og:description\" content=\"\u6df1\u5165\u7406\u89e3\u8ba1\u7b97\u673a\u7cfb\u7edf\uff08C\u8bed\u8a00\u3001\u6570\u636e\u7ed3\u6784\u3001\u5fae\u5d4c\u3001\u7f16\u8bd1\u539f\u7406\u3001\u6570\u7535\u3001\u6a21\u7535\uff09 \u7b2c\u4e00\u7ae0\uff1a\u8ba1\u7b97\u673a\u7cfb\u7edf\u6f2b\u6e38 \u7f16\u8bd1\u7cfb\u7edf hell […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.laning.org\/index.php\/2022\/07\/14\/105\/\" \/>\n<meta property=\"og:site_name\" content=\"Laning 's Blog\" \/>\n<meta property=\"article:published_time\" content=\"2022-07-14T05:45:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-03-28T03:10:32+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.laning.org\/wp-content\/uploads\/2022\/07\/QQ\u56fe\u724720220713223629.png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"laning\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2\u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blog.laning.org\/#website\",\"url\":\"https:\/\/blog.laning.org\/\",\"name\":\"\\u8fa3\\u5b81\\u7684\\u535a\\u5ba2\",\"description\":\"Learning on the go\",\"publisher\":{\"@id\":\"https:\/\/blog.laning.org\/#\/schema\/person\/040331b403ed00370f2fc1e8eb6e6b93\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blog.laning.org\/?s={search_term_string}\"},\"query-input\":\"required 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