{"id":31533,"date":"2025-04-21T15:06:19","date_gmt":"2025-04-21T07:06:19","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/31533.html"},"modified":"2025-04-21T15:06:19","modified_gmt":"2025-04-21T07:06:19","slug":"%e6%93%8d%e4%bd%9c%e7%b3%bb%e7%bb%9f%e5%ae%9e%e9%aa%8clab-2system-callsmit-6-s081-fall-2020","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/31533.html","title":{"rendered":"\u64cd\u4f5c\u7cfb\u7edf\u5b9e\u9a8cLab 2:System calls(MIT 6.S081 FALL 2020)"},"content":{"rendered":"

System calls:\u7cfb\u7edf\u8c03\u7528<\/span><\/h4>\n

\u57fa\u7840\u80cc\u666f：<\/span>\u64cd\u4f5c\u7cfb\u7edf\u5fc5\u987b\u6ee1\u8db3\u4e09\u4e2a\u8981\u6c42：\u591a\u8def\u590d\u7528\u3001\u9694\u79bb\u548c\u4ea4\u4e92\u3002<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Unix\u8fdb\u7a0b\u4e4b\u95f4\u7684\u8bb8\u591a\u4ea4\u4e92\u5f62\u5f0f\u90fd\u662f\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5b9e\u73b0\u7684<\/p>\n

———————————————————————————————————————————<\/p>\n

RISC-V\u6709\u4e09\u79cdCPU\u53ef\u4ee5\u6267\u884c\u6307\u4ee4\u7684\u6a21\u5f0f：<\/p>\n

\u673a\u5668\u6a21\u5f0f(Machine Mode):\u5728\u673a\u5668\u6a21\u5f0f\u4e0b\u6267\u884c\u7684\u6307\u4ee4\u5177\u6709\u5b8c\u5168\u7279\u6743,\u673a\u5668\u6a21\u5f0f\u4e3b\u8981\u7528\u4e8e\u914d\u7f6e\u8ba1\u7b97\u673a<\/p>\n

\u7528\u6237\u6a21\u5f0f(User Mode)<\/p>\n

\u7ba1\u7406\u6a21\u5f0f(Supervisor Mode):\u5728\u7ba1\u7406\u6a21\u5f0f\u4e0b，CPU\u88ab\u5141\u8bb8\u6267\u884c\u7279\u6743\u6307\u4ee4<\/p>\n

\"\"<\/p>\n

\u5e94\u7528\u7a0b\u5e8f\u53ea\u80fd\u6267\u884c\u7528\u6237\u6a21\u5f0f\u7684\u6307\u4ee4（\u4f8b\u5982，\u6570\u5b57\u76f8\u52a0\u7b49）\u88ab\u79f0\u4e3a\u5728\u7528\u6237\u7a7a\u95f4<\/span>\u4e2d\u8fd0\u884c<\/p>\n

\u5904\u4e8e\u7ba1\u7406\u6a21\u5f0f\u4e0b\u7684\u8f6f\u4ef6\u53ef\u4ee5\u6267\u884c\u7279\u6743\u6307\u4ee4，\u5e76\u88ab\u79f0\u4e3a\u5728\u5185\u6838\u7a7a\u95f4<\/span>\u4e2d\u8fd0\u884c\u3002<\/p>\n

\u5728\u5185\u6838\u7a7a\u95f4（\u6216\u7ba1\u7406\u6a21\u5f0f）\u4e2d\u8fd0\u884c\u7684\u8f6f\u4ef6\u88ab\u79f0\u4e3a\u5185\u6838<\/span>\u3002<\/p>\n

\u7528\u6237\u6001\u548c\u6838\u5fc3\u6001\u4ee3\u8868\u4e86\u7a0b\u5e8f\u6267\u884c\u65f6\u6240\u5904\u7684\u4e24\u79cd\u4e0d\u540c\u7684\u7279\u6743\u7ea7\u522b，\u800c\u7cfb\u7edf\u8c03\u7528\u5219\u662f\u7528\u6237\u6001\u7a0b\u5e8f\u4e0e\u6838\u5fc3\u6001\u7a0b\u5e8f\u4e4b\u95f4\u7684\u6865\u6881！！！！！！！！！！！<\/span><\/h3>\n

———————————————————————————————————————————<\/span><\/p>\n

\u5b8f\u5185\u6838（monolithic kernel）：\u6574\u4e2a\u64cd\u4f5c\u7cfb\u7edf\u90fd\u9a7b\u7559\u5728\u5185\u6838\u4e2d，\u8fd9\u6837\u6240\u6709\u7cfb\u7edf\u8c03\u7528\u7684\u5b9e\u73b0\u90fd\u4ee5\u7ba1\u7406\u6a21\u5f0f\u8fd0\u884c\u3002<\/p>\n

\u4f18\u70b9：\u4ee5\u5b8c\u5168\u7684\u786c\u4ef6\u7279\u6743\u8fd0\u884c\/\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e0d\u540c\u90e8\u5206\u66f4\u5bb9\u6613\u5408\u4f5c<\/p>\n

\u7f3a\u70b9：\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u540c\u90e8\u5206\u4e4b\u95f4\u7684\u63a5\u53e3\u901a\u5e38\u5f88\u590d\u6742<\/p>\n

\u7ba1\u7406\u6a21\u5f0f\u4e2d\u7684\u9519\u8bef\u7ecf\u5e38\u4f1a\u5bfc\u81f4\u5185\u6838\u5931\u8d25\u3002\u5982\u679c\u5185\u6838\u5931\u8d25，\u8ba1\u7b97\u673a\u505c\u6b62\u5de5\u4f5c，\u56e0\u6b64\u6240\u6709\u5e94\u7528\u7a0b\u5e8f\u4e5f\u4f1a\u5931\u8d25\u3002\u8ba1\u7b97\u673a\u5fc5\u987b\u91cd\u542f\u624d\u80fd\u518d\u6b21\u4f7f\u7528\u3002<\/span><\/p>\n

\u5fae\u5185\u6838（microkernel）：\u6700\u5927\u9650\u5ea6\u5730\u51cf\u5c11\u5728\u7ba1\u7406\u6a21\u5f0f\u4e0b\u8fd0\u884c\u7684\u64cd\u4f5c\u7cfb\u7edf\u4ee3\u7801\u91cf，\u5e76\u5728\u7528\u6237\u6a21\u5f0f\u4e0b\u6267\u884c\u5927\u90e8\u5206\u64cd\u4f5c\u7cfb\u7edf\u3002<\/p>\n

\u8865\u5145：\u5355\u673a\u5fae\u5185\u6838\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u51e0\u4e4e\u65e0\u4e00\u4f8b\u5916\u5730\u90fd\u91c7\u7528\u5ba2\u6237\/\u670d\u52a1\u5668\u6a21\u5f0f，\u5c06\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u6700\u57fa\u672c\u7684\u90e8\u5206\u653e\u5165\u5185\u6838\u4e2d，\u800c\u628a\u64cd\u4f5c\u7cfb\u7edf\u7684\u7edd\u5927\u90e8\u5206\u529f\u80fd\u90fd\u653e\u5728\u5fae\u5185\u6838\u5916\u9762\u7684\u4e00\u7ec4\u670d\u52a1\u5668(\u8fdb\u7a0b)\u4e2d\u5b9e\u73b0\u3002<\/p>\n

Xv6\u662f\u4f5c\u4e3a\u4e00\u4e2a\u5b8f\u5185\u6838\u5b9e\u73b0\u7684<\/span><\/h2>\n

———————————————————————————————————————————<\/span><\/p>\n

\u5185\u6838\u7528\u6765\u5b9e\u73b0\u8fdb\u7a0b\u7684\u673a\u5236\u5305\u62ec\u7528\u6237\/\u7ba1\u7406\u6a21\u5f0f\u6807\u5fd7\u3001\u5730\u5740\u7a7a\u95f4\u548c\u7ebf\u7a0b\u7684\u65f6\u95f4\u5207\u7247\u3002\u00a0<\/p>\n

\u4e00\u4e2a\u8fdb\u7a0b\u6700\u91cd\u8981\u7684\u5185\u6838\u72b6\u6001\u7247\u6bb5\u662f\u5b83\u7684\u9875\u8868\u3001\u5185\u6838\u6808\u533a\u548c\u8fd0\u884c\u72b6\u6001<\/p>\n

\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2a\u6267\u884c\u7ebf\u7a0b（\u6216\u7b80\u79f0\u7ebf\u7a0b）\u6765\u6267\u884c\u8fdb\u7a0b\u7684\u6307\u4ee4<\/p>\n

\u6bcf\u4e2a\u8fdb\u7a0b\u6709\u4e24\u4e2a\u6808\u533a：\u4e00\u4e2a\u7528\u6237\u6808\u533a\u548c\u4e00\u4e2a\u5185\u6838\u6808\u533a<\/p>\n

\u8fdb\u7a0b\u7684\u7ebf\u7a0b\u5728\u4e3b\u52a8\u4f7f\u7528\u5b83\u7684\u7528\u6237\u6808\u548c\u5185\u6838\u6808\u4e4b\u95f4\u4ea4\u66ff\u3002\u5185\u6838\u6808\u662f\u72ec\u7acb\u7684（\u5e76\u4e14\u4e0d\u53d7\u7528\u6237\u4ee3\u7801\u7684\u4fdd\u62a4），\u56e0\u6b64\u5373\u4f7f\u4e00\u4e2a\u8fdb\u7a0b\u7834\u574f\u4e86\u5b83\u7684\u7528\u6237\u6808，\u5185\u6838\u4f9d\u7136\u53ef\u4ee5\u6b63\u5e38\u8fd0\u884c\u3002<\/p>\n

———————————————————————————————-\u4e24\u4e2a\u4f8b\u5b50：<\/span><\/h3>\n

\u8c03\u7528\u7cfb\u7edf\u8c03\u7528：<\/span><\/h3>\n

1.\u7528\u6237\u7a0b\u5e8f\u51c6\u5907\u8c03\u7528exec：<\/span><\/p>\n

\"\"<\/p>\n

2.\u6267\u884cecall\u6307\u4ee4：<\/span><\/p>\n

\"\"<\/p>\n

3.\u5185\u6838\u5904\u7406\u7cfb\u7edf\u8c03\u7528<\/span><\/p>\n

\"\"<\/p>\n

4.\u6267\u884csys_exec\u51fd\u6570<\/span><\/p>\n

\"\"<\/p>\n

5.\u8fd4\u56de\u7528\u6237\u7a0b\u5e8f：<\/span><\/p>\n

\"\"<\/p>\n

6：\u9519\u8bef\u5904\u7406：<\/span><\/p>\n

\"\"<\/p>\n

———————————————————————————————-<\/h3>\n

\u00a0\u7cfb\u7edf\u8c03\u7528\u53c2\u6570：<\/span><\/h3>\n

\u7cfb\u7edf\u8c03\u7528\u5982\u4f55\u5b89\u5168\u5730\u5904\u7406\u7528\u6237\u7a7a\u95f4\u4f20\u9012\u7ed9\u5185\u6838\u7684\u53c2\u6570，\u7279\u522b\u662f\u5f53\u8fd9\u4e9b\u53c2\u6570\u662f\u5185\u5b58\u5730\u5740（\u5982\u6307\u9488）\u65f6\u3002<\/p>\n

\u7cfb\u7edf\u8c03\u7528\u53c2\u6570\u4f20\u9012：\u5185\u6838\u7684\u9677\u9631\u5904\u7406\u4ee3\u7801（trap handler）\u4f1a\u4fdd\u5b58\u8fd9\u4e9b\u5bc4\u5b58\u5668\u7684\u503c\u5230\u5f53\u524d\u8fdb\u7a0b\u7684\u9677\u9631\u6846\u67b6（trap frame）\u4e2d，\u5185\u6838\u4ee3\u7801\u968f\u540e\u53ef\u4ee5\u4ece\u9677\u9631\u6846\u67b6\u4e2d\u68c0\u7d22\u8fd9\u4e9b\u53c2\u6570\u3002<\/h6>\n
\u7528\u6237\u7a7a\u95f4\u4e0e\u5185\u6838\u7a7a\u95f4：\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u662f\u8ba1\u7b97\u673a\u5185\u5b58\u4e2d\u7684\u4e24\u4e2a\u4e0d\u540c\u533a\u57df，\u5206\u522b\u7528\u4e8e\u5b58\u653e\u7528\u6237\u7a0b\u5e8f\u548c\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7684\u4ee3\u7801\u548c\u6570\u636e<\/h6>\n
\u9875\u8868\u6620\u5c04：\u9875\u8868\u662f\u64cd\u4f5c\u7cfb\u7edf\u7528\u6765\u5c06\u865a\u62df\u5185\u5b58\u5730\u5740\u6620\u5c04\u5230\u7269\u7406\u5185\u5b58\u5730\u5740\u7684\u6570\u636e\u7ed3\u6784\u3002\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u6709\u5404\u81ea\u7684\u9875\u8868，\u56e0\u6b64\u5b83\u4eec\u7684\u865a\u62df\u5730\u5740\u5230\u7269\u7406\u5730\u5740\u7684\u6620\u5c04\u662f\u4e0d\u540c\u7684<\/h6>\n
\u5b89\u5168\u7684\u6570\u636e\u4f20\u8f93：\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u4e4b\u95f4\u4f20\u8f93\u6570\u636e：\u7279\u6b8a\u7684\u51fd\u6570：\u7528\u6237\u63d0\u4f9b\u7684\u865a\u62df\u5730\u5740\u548c\u5185\u6838\u7f13\u51b2\u533a\u4e4b\u95f4\u590d\u5236\u6570\u636e，\u540c\u65f6\u786e\u4fdd\u4e0d\u4f1a\u8fdd\u53cd\u5185\u5b58\u4fdd\u62a4\u89c4\u5219\u3002<\/h6>\n

———————————————————————————————————————————<\/p>\n

\u5148\u653e\u4e24\u4e2a\u6211\u9047\u5230\u7684\u95ee\u9898：<\/h3>\n

1.\u4f7f\u5f97ifconfig\u547d\u4ee4\u53ea\u51fa\u73b0\u4e86lo（\u672c\u5730\u73af\u56de）<\/h3>\n

\u6ce8\u610f：\u9700\u8981root\u6743\u9650！！！！！<\/span><\/p>\n

\/\/\u67e5\u770b\u662f\u5426\u6709ens33\u7f51\u5361
\nifconfig -a
\n\/\/\u542f\u52a8\u7f51\u5361
\nifconfig ens33 up
\n\/\/\u518d\u8f93\u5165
\ndhclient
\n\/\/\u6700\u540e\u8f93\u5165
\ndhclient ens33
\n\/\/\u68c0\u67e5
\nifconfig <\/p>\n

2.\u63d0\u4ea4\u4e86\u4fee\u6539，\u4f46\u662f\u53ea\u63d0\u4ea4\u4e86\u4e00\u534a，\u4e8e\u662fbe like:<\/h3>\n

\u60a8\u5bf9\u4e0b\u5217\u6587\u4ef6\u7684\u672c\u5730\u4fee\u6539\u5c06\u88ab\u68c0\u51fa\u64cd\u4f5c\u8986\u76d6： \u00a0\u00a0 \u00a0<\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Makefile \u00a0\u00a0 <\/h3>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0grade-lab-util <\/h3>\n

\u8bf7\u5728\u5207\u6362\u5206\u652f\u524d\u63d0\u4ea4\u6216\u8d2e\u85cf\u60a8\u7684\u4fee<\/h3>\n

Tips:\u6682\u65f6\u4e0d\u60f3\u63d0\u4ea4\u8fd9\u4e9b\u4fee\u6539，\u4f46\u53c8\u4e0d\u60f3\u4e22\u5931\u5b83\u4eec，\u53ef\u4ee5\u4f7f\u7528\u8d2e\u85cf\u547d\u4ee4\u5c06\u5176\u4fdd\u5b58\u8d77\u6765\u3002<\/span><\/h3>\n

\u4e8e\u662f\u6211\u9009\u62e9\u5148git stash<\/span><\/p>\n

\u6062\u590d\u8d2e\u85cf\u7684\u4fee\u6539\u53ef\u4ee5\u4f7f\u7528git stash apply\u547d\u4ee4<\/p>\n

_____________________________________________________________________________<\/p>\n

\u6b63\u6587\u5f00\u59cb：<\/p>\n

\u6839\u636e\u5b9e\u9a8c\u63d0\u793a：<\/p>\n

    \n
  • \u5c06\u00a0$U\/_trace\u00a0\u6dfb\u52a0\u5230\u00a0Makefile\u00a0\u7684\u00a0UPROGS\u00a0\u4e2d<\/li>\n
  • \u8fd0\u884c make qemu ， \u4f60\u5c06\u770b\u5230\u7f16\u8bd1\u5668\u65e0\u6cd5\u7f16\u8bd1 user\/trace.c ，\u56e0\u4e3a\u7cfb\u7edf\u8c03\u7528\u7684\u7528\u6237\u7a7a\u95f4\u5b58\u6839\u8fd8\u4e0d\u5b58\u5728<\/li>\n
  • \u5c06\u7cfb\u7edf\u8c03\u7528\u7684\u539f\u578b\u6dfb\u52a0\u5230 user\/user.h\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span>\n

    \u7b2c\u4e00\u6b65：int trace(int);\u00a0 \u00a0 \u00a0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

    \u4e3a\u4ec0\u4e48\u662f\u6574\u578b\u5462？\u00a0 if (trace(atoi(argv[1])) < 0)\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n

    \u89e3\u91ca：argv[0]\u00a0\u901a\u5e38\u662f\u7a0b\u5e8f\u7684\u540d\u79f0，\u800c\u00a0argv[1]\u3001argv[2]\u00a0\u7b49\u5219\u5305\u542b\u4e86\u4f20\u9012\u7ed9\u7a0b\u5e8f\u7684\u547d\u4ee4\u884c\u53c2\u6570\u3002<\/span>argv[1]\u00a0\u88ab\u671f\u671b\u5305\u542b\u4e00\u4e2a\u53ef\u4ee5\u8f6c\u6362\u4e3a\u6574\u6570\u7684\u5b57\u7b26\u4e32<\/span>，\u8be5\u6574\u6570\u5c06\u4f5c\u4e3a\u00a0trace\u00a0\u51fd\u6570\u7684\u53c2\u6570，atoi\u7528\u4e8e\u5c06\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u6574\u6570,trace\u00a0\u51fd\u6570\u6267\u884c\u5176\u64cd\u4f5c，\u5e76\u8fd4\u56de\u4e00\u4e2a\u6574\u6570\u4f5c\u4e3a\u7ed3\u679c\u00a0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/span>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/p>\n<\/li>\n

  • \u5c06\u5b58\u6839\u6dfb\u52a0\u5230 user\/usys.pl\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span>\n

    \u7b2c\u4e8c\u6b65：entry("trace");<\/span><\/p>\n

    usys.pl\u6587\u4ef6\u662f\u7528\u4e8e\u5b9a\u4e49\u548c\u5b9e\u73b0\u7cfb\u7edf\u8c03\u7528\u7528\u6237\u7a7a\u95f4\u63a5\u53e3\u7684\u5173\u952e\u7ec4\u4ef6\u4e4b\u4e00,\u5f00\u53d1\u8005\u53ef\u4ee5\u65b9\u4fbf\u5730\u6dfb\u52a0\u65b0\u7684\u7cfb\u7edf\u8c03\u7528<\/span>，\u5e76\u5728\u7528\u6237\u7a0b\u5e8f\u548c\u5185\u6838\u4e4b\u95f4\u5efa\u7acb\u5fc5\u8981\u7684\u4ea4\u4e92\u673a\u5236\u3002<\/p>\n<\/li>\n

  • \u4ee5\u53ca\u5c06\u7cfb\u7edf\u8c03\u7528\u53f7\u6dfb\u52a0\u5230 kernel\/syscall.h \u4e2d\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <\/span>\u00a0\u7b2c\u4e09\u6b65：#define SYS_trace \u00a022<\/span><\/li>\n<\/ul>\n

    \u4ee5\u4e0a\u4e09\u6b65\u5c5e\u4e8e\u6a21\u4eff\u7cfb\u7edf\u6587\u4ef6\u4e2d\u7684\u5df2\u7ecf\u5b58\u5728\u7684\u4ee3\u7801\u8bed\u53e5，\u6839\u636e\u63d0\u793a\u53ef\u4ee5\u8f7b\u677e\u62ff\u4e0b！！！！<\/span><\/h4>\n

    \u00a0user\/usys.S\u6587\u4ef6\u4e2d：li a7, SYS_fork\u00a0\u6307\u4ee4\u5c31\u662f\u628a\u00a0SYS_fork\u00a0\u7684\u7cfb\u7edf\u8c03\u7528\u53f7<\/span>\u653e\u5165\u00a0a7\u00a0\u5bc4\u5b58\u5668<\/span>，\u4f7f\u7528\u00a0ecall\u00a0\u6307\u4ee4\u8fdb\u5165\u7cfb\u7edf\u5185\u6838<\/span>，\u00a0ecall\u00a0\u6307\u4ee4\u4f1a\u8df3\u8f6c\u5230\u00a0kernel\/syscall.c\u00a0\u4e2d\u00a0syscall\u00a0\u51fd\u6570\u5904\u6267\u884c<\/span><\/p>\n

      \n
    • \u7b2c\u56db\u6b65：<\/span><\/li>\n<\/ul>\n

      syscalls[num]();\u00a0\u51fd\u6570\u8f6c\u5230\u5b9a\u4e49（F12）<\/span><\/p>\n

      \u628a\u65b0\u589e\u7684\u00a0trace\u00a0\u7cfb\u7edf\u8c03\u7528\u6dfb\u52a0\u5230\u51fd\u6570\u6307\u9488\u6570\u7ec4\u00a0*syscalls[]\u00a0\u4e0a<\/span><\/p>\n

      \u5728\u6587\u4ef6\u5f00\u5934\u7ed9\u5185\u6838\u6001\u7684\u7cfb\u7edf\u8c03\u7528\u00a0trace\u00a0\u52a0\u4e0a\u58f0\u660e<\/span><\/p>\n<\/p>\n

        \n
      • trace\u00a0\u7cfb\u7edf\u8c03\u7528\u5e94\u8be5\u6709\u4e00\u4e2a\u53c2\u6570，\u4e00\u4e2a\u6574\u6570\u201cmask(\u63a9\u7801)\u201d，\u5176\u6307\u5b9a\u8981\u8ddf\u8e2a\u7684\u7cfb\u7edf\u8c03\u7528\u3002<\/li>\n<\/ul>\n

        \u00a0 \u00a0 \u00a0 \u00a0\u7b2c\u4e94\u6b65：\u5728\u00a0kernel\/proc.h\u00a0\u6587\u4ef6\u7684\u00a0proc\u00a0\u7ed3\u6784\u4f53\u4e2d，\u65b0\u6dfb\u52a0\u4e00\u4e2a\u53d8\u91cf\u00a0mask\u00a0<\/span><\/p>\n

        \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u5728\u00a0kernel\/sysproc.c\u00a0\u7ed9\u51fa\u00a0sys_trace\u00a0\u51fd\u6570\u7684\u5177\u4f53\u5b9e\u73b0<\/span><\/p>\n<\/p>\n

        uint64
        \nsys_trace(void)
        \n{
        \n int mask;
        \n \/\/ \u53d6 a0 \u5bc4\u5b58\u5668\u4e2d\u7684\u503c\u8fd4\u56de\u7ed9 mask
        \n \/\/argint\u51fd\u6570\u7528\u4e8e\u5b89\u5168\u5730\u4ece\u7528\u6237\u6001\u4f20\u9012\u7684\u53c2\u6570\u4e2d\u8bfb\u53d6\u6574\u6570\u503c
        \n \/\/\u56e0\u4e3a\u76f4\u63a5\u8bfb\u53d6\u7528\u6237\u6001\u5185\u5b58\u53ef\u80fd\u4f1a\u53d7\u5230\u6076\u610f\u7528\u6237\u7684\u5f71\u54cd
        \n if(argint(0, &mask) < 0)
        \n return -1;<\/p>\n

        \/\/ \u628a mask \u4f20\u7ed9\u73b0\u6709\u8fdb\u7a0b\u7684 mask
        \n \/\/\u5047\u8bbemyproc()\u662f\u4e00\u4e2a\u8fd4\u56de\u5f53\u524d\u8fdb\u7a0b\u63a7\u5236\u5757（PCB）\u6307\u9488\u7684\u51fd\u6570
        \n \/\/\u5141\u8bb8\u7cfb\u7edf\u8c03\u7528\u76f4\u63a5\u4fee\u6539\u5f53\u524d\u8fdb\u7a0b\u7684\u72b6\u6001，\u4ece\u800c\u5b9e\u73b0\u4e86\u52a8\u6001\u8c03\u6574\u8ddf\u8e2a\u63a9\u7801
        \n myproc()->mask = mask;
        \n return 0;
        \n}
        \n\/\/\u5f53\u9700\u8981\u4fee\u6539\u6216\u6269\u5c55\u7cfb\u7edf\u8c03\u7528\u65f6，\u53ea\u9700\u4fee\u6539\u76f8\u5e94\u7684\u51fd\u6570\u5373\u53ef，\u800c\u65e0\u9700\u66f4\u6539\u7528\u6237\u6001\u7a0b\u5e8f\u3002<\/p>\n

          \n
        • proc\u00a0\u7ed3\u6784\u4f53(\u89c1\u00a0kernel\/proc.h\u00a0)\u91cc\u7684\u00a0name\u00a0\u662f\u8868\u793a\u4e0e\u6574\u4e2aproc\u7ed3\u6784\u4f53（\u5373\u8fdb\u7a0b）\u76f8\u5173\u8054\u7684\u540d\u79f0\u3002name\u662f\u8fdb\u7a0b\u7684\u540d\u79f0，\u7528\u4e8e\u8c03\u8bd5\u6216\u5176\u4ed6\u9700\u8981\u5f15\u7528\u6216\u6807\u8bc6\u8fdb\u7a0b\u7684\u60c5\u51b5\u3002\u8981\u81ea\u5df1\u5b9a\u4e49\u4e00\u4e2a\u6570\u7ec4<\/li>\n<\/ul>\n

          \u7b2c\u516d\u6b65：\u7cfb\u7edf\u8c03\u7528\u540d\u5b57\u4e00\u5b9a\u8981\u6309\u987a\u5e8f<\/span><\/p>\n

          \u7cfb\u7edf\u8c03\u7528\u53f7\u662f\u4ece\u00a01\u00a0\u5f00\u59cb，\u5b9a\u4e49\u7b2c\u4e00\u4e2a\u4e3a\u7a7a\u5b57\u7b26\u4e32<\/span><\/p>\n

          static char *syscall_names[] = {
          \n "", "fork", "exit", "wait", "pipe",
          \n "read", "kill", "exec", "fstat", "chdir",
          \n "dup", "getpid", "sbrk", "sleep", "uptime",
          \n "open", "write", "mknod", "unlink", "link",
          \n "mkdir", "close", "trace"};<\/p>\n

          \u68c0\u67e5\u67d0\u4e2a\u7279\u5b9a\u7684\u6807\u5fd7（\u7531num\u6307\u5b9a）\u662f\u5426\u5728p\u6307\u5411\u7684\u8fdb\u7a0b\u7684mask\u5b57\u6bb5\u4e2d\u88ab\u8bbe\u7f6e<\/p>\n

          1 << num：\u8fd9\u662f\u4e00\u4e2a\u5de6\u79fb\u64cd\u4f5c<\/p>\n

          & p->mask：\u8fd9\u662f\u4e00\u4e2a\u6309\u4f4d\u4e0e（AND）\u64cd\u4f5c<\/p>\n

          (1 << num) & p->mask\u7684\u7ed3\u679c\u4e0d\u4e3a0（\u5b9e\u9645\u4e0a\u662f1 << num\u7684\u7ed3\u679c\u672c\u8eab，\u56e0\u4e3a\u53ea\u6709\u5728\u5bf9\u5e94\u4f4d\u90fd\u4e3a1\u65f6，\u6309\u4f4d\u4e0e\u64cd\u4f5c\u624d\u4f1a\u5728\u8be5\u4f4d\u4ea7\u751f1），\u6761\u4ef6\u4e3a\u771f\u3002<\/p>\n

          if((1 << num) & p->mask) {
          \n printf("%d: syscall %s -> %d\\\\n", p->pid, syscall_names[num], p->trapframe->a0);
          \n } <\/p>\n

          \u7b2c\u4e03\u6b65：\u5728\u00a0kernel\/proc.c\u00a0\u4e2d\u00a0fork\u00a0\u51fd\u6570\u8c03\u7528\u65f6，\u6dfb\u52a0\u5b50\u8fdb\u7a0b\u590d\u5236\u7236\u8fdb\u7a0b\u7684\u00a0mask\u00a0\u7684\u4ee3\u7801<\/span><\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0np->mask = p->mask;<\/span><\/p>\n<\/p>\n

          \u8fd0\u884c：make qemu<\/p>\n

          $ trace 32 grep hello README，<\/p>\n

          $ trace 2147483647 grep hello README，<\/p>\n

          $ grep hello README，<\/p>\n

          $ trace 2 usertests forkforkfor<\/p>\n

          \u00a0\u9000\u51fa xv6 ，\u8fd0\u884c\u5355\u5143\u6d4b\u8bd5\u68c0\u67e5\u7ed3\u679c\u662f\u5426\u6b63\u786e:.\/grade-lab-syscall trace<\/span><\/h3>\n<\/p>\n

          \u00a0<\/p>\n

          \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0\u00a0<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

          \u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb1.1k\u6b21\uff0c\u70b9\u8d5e24\u6b21\uff0c\u6536\u85cf11\u6b21\u3002Xv6\u662f\u4f5c\u4e3a\u4e00\u4e2a\u5b8f\u5185\u6838\u5b9e\u73b0\u7684System calls:\u7cfb\u7edf\u8c03\u7528\u64cd\u4f5c\u7cfb\u7edf\u5fc5\u987b\u6ee1\u8db3\u4e09\u4e2a\u8981\u6c42\uff1a\u591a\u8def\u590d\u7528\u3001\u9694\u79bb\u548c\u4ea4\u4e92\u3002Unix\u8fdb\u7a0b\u4e4b\u95f4\u7684\u8bb8\u591a\u4ea4\u4e92\u5f62\u5f0f\u90fd\u662f\u901a\u8fc7\u6587\u4ef6\u63cf\u8ff0\u7b26\u5b9e\u73b0\u7684\u5728\u673a\u5668\u6a21\u5f0f\u4e0b\u6267\u884c\u7684\u6307\u4ee4\u5177\u6709\u5b8c\u5168\u7279\u6743,\u673a\u5668\u6a21\u5f0f\u4e3b\u8981\u7528\u4e8e\u914d\u7f6e\u8ba1\u7b97\u673a\u5728\u7ba1\u7406\u6a21\u5f0f\u4e0b\uff0cCPU\u88ab\u5141\u8bb8\u6267\u884c\u7279\u6743\u6307\u4ee4\u5e94\u7528\u7a0b\u5e8f\u53ea\u80fd\u6267\u884c\u7528\u6237\u6a21\u5f0f\u7684\u6307\u4ee4\uff08\u4f8b\u5982\uff0c\u6570\u5b57\u76f8\u52a0\u7b49\uff09\u88ab\u79f0\u4e3a\u5728\u4e2d\u8fd0\u884c\u5904\u4e8e\u7ba1\u7406\u6a21\u5f0f\u4e0b\u7684\u8f6f\u4ef6\u53ef\u4ee5\u6267\u884c\u7279\u6743\u6307\u4ee4\uff0c\u5e76\u88ab\u79f0\u4e3a\u5728\u4e2d\u8fd0\u884c\u3002\u5728\u5185\u6838\u7a7a\u95f4\uff08\u6216\u7ba1\u7406\u6a21\u5f0f\uff09\u4e2d\u8fd0\u884c\u7684\u8f6f\u4ef6\u88ab\u79f0\u4e3a\u5185\u6838\u3002_\u5b9e\u9a8c2:system calls<\/p>\n","protected":false},"author":2,"featured_media":31526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[43,44],"topic":[],"class_list":["post-31533","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-43","tag-44"],"yoast_head":"\n\u64cd\u4f5c\u7cfb\u7edf\u5b9e\u9a8cLab 2:System calls(MIT 6.S081 FALL 2020) - 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