{"id":135041,"date":"2022-12-07T09:25:59","date_gmt":"2022-12-07T01:25:59","guid":{"rendered":"http:\/\/www.idc.net\/help\/135041\/"},"modified":"2022-12-07T09:25:59","modified_gmt":"2022-12-07T01:25:59","slug":"linux-%e6%8a%a5%e9%94%99%e4%bb%a3%e7%a0%81-139-%e8%a7%a3%e6%9e%90%e4%b8%8e%e4%bf%ae%e5%a4%8d%e6%96%b9%e6%b3%95-linux-error-code-139","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/135041\/","title":{"rendered":"Linux \u62a5\u9519\u4ee3\u7801 139 \u89e3\u6790\u4e0e\u4fee\u590d\u65b9\u6cd5 (linux error code 139)"},"content":{"rendered":"<p>Linux \u662f\u4e00\u6b3e\u975e\u5e38\u7a33\u5b9a\u53ef\u9760\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u4f46\u662f\u968f\u7740\u8f6f\u4ef6\u7684\u4e0d\u65ad\u5347\u7ea7\u548c\u5404\u79cd\u5e94\u7528\u7a0b\u5e8f\u7684\u666e\u53ca\uff0cLinux \u62a5\u9519\u4e5f\u65e5\u76ca\u5e38\u89c1\uff0c\u6bd4\u5982\u5e38\u89c1\u7684 139 \u9519\u8bef\u7801\u3002\u8fd9\u4e2a\u9519\u8bef\u901a\u5e38\u4e0e\u5e94\u7528\u7a0b\u5e8f\u9519\u8bef\u6216\u8005\u662f\u7cfb\u7edf\u5e93\u9519\u8bef\u6709\u5173\uff0c\u4e0b\u9762\u6211\u4eec\u5c06\u5bf9 Linux \u62a5\u9519\u4ee3\u7801 139 \u8fdb\u884c\u8be6\u7ec6\u89e3\u6790\uff0c\u5e76\u63d0\u4f9b\u4e00\u4e9b\u4fee\u590d\u65b9\u6cd5\u3002<\/p>\n<p>Linux \u62a5\u9519\u4ee3\u7801 139 \u7684\u542b\u4e49<\/p>\n<p>Linux \u62a5\u9519\u4ee3\u7801 139 \u901a\u5e38\u8868\u793a\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u6bb5\u9519\u8bef\uff08Segmentation Fault\uff09\uff0c\u4e5f\u5c31\u662f\u7a0b\u5e8f\u8bd5\u56fe\u8bfb\u53d6\u6216\u5199\u5165\u975e\u6cd5\u7684\u5185\u5b58\u4f4d\u7f6e\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u5d29\u6e83\u3002\u8fd9\u4e2a\u9519\u8bef\u7801\u8fd8\u6709\u5176\u4ed6\u7684\u542b\u4e49\uff0c\u6bd4\u5982\u5728\u67d0\u4e9b\u9ad8\u7ea7\u8bed\u8a00\u4e2d\uff0c\u5b83\u53ef\u80fd\u8868\u793a\u8fd0\u884c\u65f6\u9519\u8bef\u3002<\/p>\n<p>\u9020\u6210\u8fd9\u4e2a\u9519\u8bef\u7684\u539f\u56e0\u5f88\u591a\uff0c\u53ef\u80fd\u662f\u4ee3\u7801\u4e2d\u7684\u6307\u9488\u9519\u8bef\u3001\u6570\u7ec4\u8d8a\u754c\u3001\u7f13\u51b2\u533a\u6ea2\u51fa\u3001\u5806\u6808\u6ea2\u51fa\u7b49\u3002\u5f53\u7a0b\u5e8f\u8bd5\u56fe\u8bbf\u95ee\u65e0\u6548\u7684\u5185\u5b58\u5730\u5740\u65f6\uff0c\u5185\u6838\u4f1a\u68c0\u6d4b\u5230\u8fd9\u4e2a\u60c5\u51b5\uff0c\u5e76\u53d1\u9001\u4e00\u4e2a\u4fe1\u53f7\u7ed9\u5e94\u7528\u7a0b\u5e8f\uff0c\u544a\u8bc9\u5b83\u51fa\u73b0\u4e86\u6bb5\u9519\u8bef\u3002\u7136\u540e\u5e94\u7528\u7a0b\u5e8f\u5c06\u4f1a\u505c\u6b62\u5e76\u9000\u51fa\u3002<\/p>\n<p>\u5e38\u89c1\u7684\u4fee\u590d\u65b9\u6cd5<\/p>\n<p>\u867d\u7136 Linux \u62a5\u9519\u4ee3\u7801 139 \u53ef\u80fd\u662f\u4e00\u4e2a\u975e\u5e38\u607c\u4eba\u7684\u95ee\u9898\uff0c\u4f46\u662f\u901a\u5e38\u6765\u8bf4\u8fd9\u4e2a\u95ee\u9898\u662f\u53ef\u4ee5\u89e3\u51b3\u7684\u3002\u4e0b\u9762\u6211\u4eec\u63d0\u4f9b\u4e00\u4e9b\u5e38\u89c1\u7684\u4fee\u590d\u65b9\u6cd5\u3002<\/p>\n<p>1. \u68c0\u67e5\u4ee3\u7801<\/p>\n<p>\u6211\u4eec\u9700\u8981\u68c0\u67e5\u5e94\u7528\u7a0b\u5e8f\u7684\u4ee3\u7801\u3002\u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u5728\u4f7f\u7528\u6307\u9488\u65f6\u6ca1\u6709\u6b63\u786e\u68c0\u67e5\u662f\u5426\u7a7a\uff0c\u6216\u8005\u5728\u4f7f\u7528\u6570\u7ec4\u65f6\u6ca1\u6709\u68c0\u67e5\u6570\u7ec4\u4e0b\u6807\u662f\u5426\u8d8a\u754c\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4 Linux \u62a5\u9519\u4ee3\u7801 139\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u4ed4\u7ec6\u68c0\u67e5\u4ee3\u7801\u5e76\u4fee\u590d\u6f5c\u5728\u7684\u9519\u8bef\u3002<\/p>\n<p>2. \u68c0\u67e5\u7cfb\u7edf\u5e93<\/p>\n<p>\u6709\u65f6\u5019\uff0cLinux \u62a5\u9519\u4ee3\u7801 139 \u53ef\u80fd\u662f\u7531\u4e8e\u7cfb\u7edf\u5e93\u4e2d\u7684\u9519\u8bef\u5f15\u8d77\u7684\u3002\u8fd9\u65f6\u5019\uff0c\u6211\u4eec\u9700\u8981\u68c0\u67e5\u7cfb\u7edf\u5e93\u662f\u5426\u6b63\u786e\u5b89\u88c5\u3001\u66f4\u65b0\u548c\u914d\u7f6e\u3002\u5982\u679c\u7cfb\u7edf\u5e93\u5b58\u5728\u95ee\u9898\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u91cd\u65b0\u5b89\u88c5\u3001\u66f4\u65b0\u6216\u8005\u66f4\u6539\u914d\u7f6e\u6765\u89e3\u51b3\u95ee\u9898\u3002<\/p>\n<p>3. \u8c03\u8bd5\u5e94\u7528\u7a0b\u5e8f<\/p>\n<p>\u5728\u8c03\u8bd5\u5e94\u7528\u7a0b\u5e8f\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 gdb \u5de5\u5177\u6765\u4e86\u89e3\u7a0b\u5e8f\u5728\u5d29\u6e83\u65f6\u53d1\u751f\u4e86\u4ec0\u4e48\u3002\u901a\u8fc7 gdb\uff0c\u6211\u4eec\u53ef\u4ee5\u67e5\u770b\u7a0b\u5e8f\u72b6\u6001\u3001\u53d8\u91cf\u503c\u3001\u5806\u6808\u4fe1\u606f\u7b49\uff0c\u627e\u5230\u5bfc\u81f4 Linux \u62a5\u9519\u4ee3\u7801 139 \u7684\u6839\u672c\u539f\u56e0\uff0c\u5e76\u5c1d\u8bd5\u89e3\u51b3\u5b83\u3002<\/p>\n<p>4. \u4f18\u5316\u7f16\u8bd1\u5668\u9009\u9879<\/p>\n<p>\u6709\u65f6\u5019\uff0c\u4f7f\u7528\u4e0d\u6b63\u786e\u7684\u7f16\u8bd1\u9009\u9879\u53ef\u80fd\u4f1a\u5bfc\u81f4 Linux \u62a5\u9519\u4ee3\u7801 139\u3002\u4f8b\u5982\uff0c\u8fc7\u5ea6\u4f18\u5316\u4ee3\u7801\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6307\u9488\u548c\u6570\u7ec4\u8bbf\u95ee\u9519\u8bef\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u9700\u8981\u4f7f\u7528\u6b63\u786e\u7684\u7f16\u8bd1\u5668\u9009\u9879\u6765\u7f16\u8bd1\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n<p>5. \u4f7f\u7528\u5185\u5b58\u68c0\u6d4b\u5de5\u5177<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5185\u5b58\u68c0\u6d4b\u5de5\u5177\u6765\u5e2e\u52a9\u6211\u4eec\u627e\u5230\u4ee3\u7801\u4e2d\u7684\u5185\u5b58\u8bbf\u95ee\u9519\u8bef\u3002\u5e38\u89c1\u7684\u5de5\u5177\u5305\u62ec Valgrind\u3001Memtest86 \u7b49\u3002\u8fd9\u4e9b\u5de5\u5177\u53ef\u4ee5\u68c0\u6d4b\u5185\u5b58\u8bbf\u95ee\u9519\u8bef\uff0c\u5e76\u5e2e\u52a9\u6211\u4eec\u5c3d\u65e9\u53d1\u73b0\u548c\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002<\/p>\n<p>Linux \u62a5\u9519\u4ee3\u7801 139 \u53ef\u80fd\u662f\u4e00\u4e2a\u975e\u5e38\u4ee4\u4eba\u6cae\u4e27\u7684\u95ee\u9898\uff0c\u4f46\u662f\u901a\u8fc7\u4e00\u4e9b\u7b80\u5355\u7684\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u627e\u5230\u5e76\u89e3\u51b3\u8fd9\u4e9b\u95ee\u9898\u3002\u5bf9\u4e8e\u5f00\u53d1\u4eba\u5458\u6765\u8bf4\uff0c\u8bf7\u786e\u4fdd\u7a0b\u5e8f\u4ee3\u7801\u6ca1\u6709\u5185\u5b58\u8bbf\u95ee\u9519\u8bef\uff0c\u5e76\u4f7f\u7528\u6b63\u786e\u7684\u7f16\u8bd1\u9009\u9879\u6765\u7f16\u8bd1\u5e94\u7528\u7a0b\u5e8f\u3002\u5bf9\u4e8e\u7cfb\u7edf\u7ba1\u7406\u5458\u6765\u8bf4\uff0c\u8bf7\u786e\u4fdd\u7cfb\u7edf\u5e93\u6b63\u786e\u5b89\u88c5\u3001\u66f4\u65b0\u548c\u914d\u7f6e\u597d\uff0c\u5e76\u4f7f\u7528\u5185\u5b58\u68c0\u6d4b\u5de5\u5177\u6765\u5e2e\u52a9\u627e\u5230\u548c\u89e3\u51b3\u5185\u5b58\u8bbf\u95ee\u9519\u8bef\u3002\u901a\u8fc7\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u63d0\u9ad8 Linux \u7cfb\u7edf\u7684\u7a33\u5b9a\u6027\u548c\u53ef\u9760\u6027\uff0c\u4e3a\u7528\u6237\u63d0\u4f9b\u66f4\u597d\u7684\u670d\u52a1\u3002<\/p>\n<p><strong>\u76f8\u5173\u95ee\u9898\u62d3\u5c55\u9605\u8bfb\uff1a<\/strong><\/p>\n<ul>\n<li>\u5173\u4e8eLinux\u4e2d\u7981\u7528\u4e2d\u65ad\u548c\u9501\u5b9a\u7684\u5173\u7cfb\u95ee\u9898<\/li>\n<\/ul>\n<h3>\u5173\u4e8eLinux\u4e2d\u7981\u7528\u4e2d\u65ad\u548c\u9501\u5b9a\u7684\u5173\u7cfb\u95ee\u9898<\/h3>\n<p>\u7981\u7528\u4e86\u4e2d\u65ad\u540e\u5c31\u4e0d\u4f1a\u53d1\u751f\u62a2\u5360\u4e86\uff0c\u62a2\u5360\u662f\u901a\u8fc7\u4e2d\u65ad\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u53c2\u8003\u4e00\u4e0b<\/p>\n<p>\u4e00\u4e2a\u786c\u4e2d\u65ad\u7684\u5b8c\u6574\u5904\u7406\u8fc7\u7a0b\uff082.4.24\u7248\u672c\uff09 CPU\u505a\u7684\u641c\u4f59\u5de5\u4f5c\uff1a<\/p>\n<p>CPU\u6536\u5230\u4e2d\u65ad\/\u5f02\u5e38\u4fe1\u53f7\uff1b<\/p>\n<p>CPU\u5224\u65ad\u5f53\u524dCPL\u7ea7\u522b\u5982\u679c\u7b49\u4e8e3\uff0c\u5219\u5bfc\u81f4\u5806\u6808\u5207\u63623-&gt;0\uff0c\u5806\u6808\u5207\u6362\u8fc7\u7a0b\uff1a<\/p>\n<p>a. CPU\u4ece\u5f53\u524dTR\u6307\u5411\u7684TSS\u4e2d\u8bfb\u53d6SS0\u548cESP0\uff1b<\/p>\n<p>b. CPU\u5c06\u5f53\u524d\u7684\u3010SS:ESP\u3011\u5bc4\u5b58\u5668\u5185\u5bb9\u4e34\u65f6\u4fdd\u5b58\u8d77\u6765\uff0c\u5047\u8bbe\u4e3aSSt\u548cESPt\uff1b<\/p>\n<p>c. CPU\u5c06SS0\u548cESP0\u6062\u590d\u5230\u3010SS:ESP\u3011\u5bc4\u5b58\u5668\u4e2d\uff1b<\/p>\n<p>d. CPU\u5c06\u5728b\u4e2d\u4e34\u65f6\u4fdd\u5b58\u7684SSt\u548cESPt\u538b\u5165\u5f53\u524d\u7684\u5806\u6808\u3010SS:ESP\u3011\u4e2d\u4e16\u4f0f\u6eda\uff08\u5176\u5b9e\u5c31\u662fSS0\u548cESP0)\uff1b<\/p>\n<p>CPU\u5224\u65ad\u5f53\u524dCPL\u7ea7\u522b\u5982\u679c\u7b49\u4e8e0\uff0c\u5219\u4e0d\u4f1a\u67092\u4e2d\u7684\u6b65\u9aa4\uff1b<\/p>\n<p>CPU\u5c06EFLAGS\u3001CS\u3001EIP\u4f9d\u6b21\u538b\u5165\u5f53\u524d\u7684\u5806\u6808\u3010SS:ESP\u3011\u4e2d\uff1b<\/p>\n<p>\u5982\u679c\u5f53\u524d\u662f\u5f02\u5e38\uff0c\u5219CPU\u5c06\u5f02\u5e38\u7801error code\u538b\u5165\u5f53\u524d\u7684\u5806\u6808\u3010SS:ESP\u3011\u4e2d\uff0c\u5426\u5219\u4f1a\u7701\u7565\u8be5\u6b65\u9aa4\uff1b<\/p>\n<p>\u5bf9\u4e8e\u4e2d\u65ad\uff0cCPU\u6e05\u96f6\u5f53\u524dEFLAGS-&gt;IF\u4f4d\uff0c\u5373\u5173\u95edCPU\u4e2d\u65ad\u4f7f\u80fd\uff0c\u5bf9\u4e8e\u5f02\u5e38\uff0cCPU\u5219\u4e0d\u4f1a\u6e05\u96f6\u8be5\u4f4d\uff1b<\/p>\n<p>\u6267\u884c\u5bf9\u4e2d\u65ad\/\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u8c03\u7528\uff1b<\/p>\n<p>\u6ce8\uff1a\u5bf9\u4e2d\u65ad\/\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u7684\u8981\u6c42\uff0c\u4e3a\u4e86\u6b63\u5e38\u7684\u4ece\u4e2d\u65ad\/\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u4e2d\u8fd4\u56de\uff0c\u4e2d\u65ad\/\u5f02\u5e38\u5904\u7406\u7a0b\u5e8f\u5fc5\u987b\u4f7f\u7528IRET\u6307\u4ee4\u8fd4\u56de\uff0c\u8be5\u6307\u4ee4\u4f1a\u4f9d\u6b21\u51fa\u6808EIP\u3001CS\u548cEFLAGS\uff0c\u6bd4RET\u591a\u4e00\u4e2aEFLAGS\uff0c\u5f53EFLAGS\u6062\u590d\u540e\uff0c\u7531\u4e8e\u539f\u6765\u4fdd\u5b58\u65f6IF\u4f4d\u4e3a1\uff0c\u56e0\u5385\u5c81\u6b64\u8fd9\u91cc\u76f8\u5f53\u4e8eCPU\u4e2d\u65ad\u4f7f\u80fd\u53c8\u6253\u5f00\u4e86\uff1b<\/p>\n<p> Linux\u5185\u6838\u505a\u7684\u5de5\u4f5c\uff1a<\/p>\n<p>1. \u4e2d\u65ad\u5411\u91cf\u8868\u2013&gt;common_interrupt\uff1a<\/p>\n<p>common_interrupt:<\/p>\n<p> SAVE_ALL <\/p>\n<p> pushl $ret_from_intr<\/p>\n<p> SYMBOL_NAME_STR(call_do_IRQ): <\/p>\n<p>jmp SYMBOL_NAME_STR(do_IRQ);<\/p>\n<p>SAVE_ALL\u4fdd\u5b58\u6240\u6709CPU\u6ca1\u6709\u4fdd\u5b58\u7684\u5bc4\u5b58\u5668\uff0c\u7531\u4e8edo_IRQ\u662f\u51fd\u6570\uff0c\u8fd9\u91cc\u76f4\u63a5\u8c03\u7528jmp\uff0c\uff08\u4e00\u822c\u7528call\u6765\u8c03\u7528\u51fd\u6570\uff0ccall\u4f1a\u5bfc\u81f4pushEIP\uff0c\u4f46jmp\u4e0d\u4f1a\uff09\u8fd9\u6837\u5f53do_IRQ\u8fd4\u56de\u8c03\u7528ret\uff08ret\u76f8\u5f53\u4e8epopEIP\uff09\u65f6\uff0c\u4f1a\u5f39\u51fa\u6808\u4e2d\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u5230EIP\uff0c\u5f88\u663e\u7136\u8fd9\u91cc\u5c31\u662fret_from_intr\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u4ecedo_IRQ\u4e2d\u8fd4\u56de\u540e\uff0c\u4f1a\u8df3\u8f6c\u5230ret_from_intr\u5904\u7ee7\u7eed\u6267\u884c\uff1b<\/p>\n<p>2. \u6765\u5230do_IRQ\uff1a<\/p>\n<p>a. \u9996\u5148\u7ed9\u786c\u4e2d\u65ad\u8ba1\u6570\u52a01,irq_enter(cpu, irq)\u4e5f\u5c31\u662f\uff1a++local_irq_count(cpu)\uff1b\u6bcf\u8fdb\u5165\u4e00\u4e2a\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u524d\uff0clocal_irq_count(cpu)\u8ba1\u6570\u4fbf\u88ab\u52a01\uff0c\u5904\u7406\u5b8c\u6bd5\u540e\u51cf1\uff1b<\/p>\n<p>b. \u5982\u679c\u5f53\u524d\u8bbe\u5907\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u53ef\u4ee5\u5728\u4e2d\u65ad\u6253\u5f00\u7684\u60c5\u51b5\u4e0b\u8fd0\u884c\uff0c\u5219\u8c03\u7528sti\u5c06EFLAGS.IF\u7f6e\u4f4d\uff0c\u6253\u5f00\u786c\u4e2d\u65ad\u4f7f\u80fd\uff1b<\/p>\n<p>c. \u8c03\u7528request_irq\u6ce8\u518c\u7684\u8bbe\u5907\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff1b<\/p>\n<p>d. \u65e0\u8bbaEFLAGS.IF\u662f\u5426\u4e3a0\uff0c\u90fd\u8c03\u7528cli\u5c06EFLAGS.IF\u6e05\u96f6\uff0c\u5c06\u786c\u4e2d\u65ad\u4f7f\u80fd\u5173\u95ed\uff1b<\/p>\n<p>e. \u7ed9\u786c\u4e2d\u65ad\u8ba1\u6570\u51cf1,irq_enter(cpu, irq);\u8be5\u51fd\u6570\u5176\u5b9e\u5c31\u662f\uff1a\u2013local_irq_count(cpu);<\/p>\n<p>f. \u5982\u679c\u6b64\u65f6\u6709\u8f6f\u4e2d\u65ad\u9700\u8981\u8fd0\u884c\uff08\u5982\u5728\u524d\u9762\u7684\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u4e2d\u8c03\u7528__cpu_raise_softirq\uff09\uff0c\u5219\u8fdb\u5165do_softirq\u4e2d\u5904\u7406\u8f6f\u4e2d\u65ad\uff0c\u5173\u4e8edo_softirq\u4e2d\u7684\u5904\u7406\u6b65\u9aa4\u89c13\uff1b<\/p>\n<p>e. do_IRQ\u6267\u884cret\uff0c\u8fd4\u56de\u5230ret_from_intr\u3002<\/p>\n<p>3. do_softirq\uff1a<\/p>\n<p>a. \u9996\u5148\u5224\u65ad\u5f53\u524d\u662f\u5426\u8fd8\u6709\u6ca1\u6709\u5904\u7406\u5b8c\u6bd5\u7684\u786c\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u6216\u8f6f\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u5982\u679c\u6709\uff0c\u5219\u76f4\u63a5\u9000\u51fa\u8be5\u51fd\u6570\u3002\u5224\u65ad\u65b9\u6cd5\u89c1\u9644\u6ce8\u3010\u6587\uff086\uff09\u3011\u3002<\/p>\n<p>b.\u5c06\u8f6f\u4e2d\u65ad\u5904\u7406\u8ba1\u6570\u52a01\uff0clocal_bh_disable()\u4e5f\u5c31\u662flocal_bh_count(cpu)++\uff1b\u6bcf\u8fdb\u5165do_softirq\u51c6\u5907\u8fdb\u884c\u5904\u7406\u8f6f\u4e2d\u65ad\u524d\uff0clocal_bh_count(cpu)\u8ba1\u6570\u4fbf\u88ab\u52a01\uff0c\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u5728do_softirq\u8fd4\u56de\u524d\uff0c\u5c06\u5176\u503c\u51cf1\uff1b<\/p>\n<p>c. \u65e0\u8bbaEFLAGS.IF\u662f\u5426\u4e3a0\uff0c\u90fd\u8c03\u7528cli\u5c06EFLAGS.IF\u6e05\u96f6\uff0c\u5c06\u786c\u4e2d\u65ad\u4f7f\u80fd\u5173\u95ed\uff0c\u5904\u7406\u4e9b\u8f6f\u4e2d\u65ad\u6807\u5fd7\u4f4d\u7684\u95ee\u9898\uff0c\u968f\u540e\u8c03\u7528sti\u5c06EFLAGS.IF\u7f6e\u4f4d\uff0c\u6253\u5f00\u786c\u4e2d\u65ad\u4f7f\u80fd\uff1b<\/p>\n<p>d. \u6267\u884c\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff1b<\/p>\n<p>e. \u8c03\u7528cli\u5c06EFLAGS.IF\u6e05\u96f6\uff0c\u5c06\u786c\u4e2d\u65ad\u4f7f\u80fd\u5173\u95ed\uff0c\u5904\u7406\u4e9b\u8f6f\u4e2d\u65ad\u6807\u5fd7\u4f4d\u7684\u95ee\u9898\uff1b<\/p>\n<p>f. \u5c06\u8f6f\u4e2d\u65ad\u5904\u7406\u8ba1\u6570\u51cf1\uff0clocal_bh_enable()\u4e5f\u5c31\u662flocal_bh_count(cpu)\u2013\uff1b<\/p>\n<p>g. \u8fd4\u56de\u52302.e\u4e2d\uff1b<\/p>\n<p>4. ret_from_intr\uff1a<\/p>\n<p>ENTRY(ret_from_intr)<\/p>\n<p>GET_CURRENT(%ebx)<\/p>\n<p>movl EFLAGS(%esp),%eax<\/p>\n<p>movb CS(%esp),%al<\/p>\n<p>testl $(VM_MASK | 3),%eax<\/p>\n<p>jne ret_with_reschedule<\/p>\n<p>jmp restore_all<\/p>\n<p>\u5728\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u901a\u8fc7\u201dtestl $(VM_MASK |3),%eax\u201d\u68c0\u6d4b\u4e2d\u65ad\u524d\u5915\u5bc4\u5b58\u5668EFLAGS\u7684\u9ad86\u4f4d\u548c\u4ee3\u7801\u6bb5\u5bc4\u5b58\u5668CS\u7684\u5185\u5bb9\uff0c\u6765\u5224\u65ad\u4e2d\u65ad\u524d\u5915CPU\u662f\u5426\u8fd0\u884c\u4e8eVM86\u6a21\u5f0f\u3001\u7528\u6237\u7a7a\u95f4\u8fd8\u662f\u7cfb\u7edf\u7a7a\u95f4\uff0c\u5bf9VM86\u8fd9\u91cc\u4e0d\u8bb2\u4e86\uff0c\u4f46\u662f\u6211\u4eec\u77e5\u9053CS\u66f4\u4f4e\u4e24\u4f4d\u4ee3\u8868\u7740\u4e2d\u65ad\u53d1\u751f\u65f6CPU\u7684\u8fd0\u884c\u7ea7\u522bCPL\uff0c\u6211\u4eec\u77e5\u9053Linux\u53ea\u91c7\u7528\u4e24\u79cd\u8fd0\u884c\u7ea7\u522b\uff0c\u7cfb\u7edf\u4e3a0\uff0c\u7528\u6237\u4e3a3\uff0c\u6240\u4ee5\uff0c\u5982\u679cCS\u7684\u66f4\u4f4e\u4e24\u4f4d\u4e3a\u975e0\uff0c\u90a3\u5c31\u8bf4\u660e\u4e2d\u65ad\u53d1\u751f\u4e8e\u7528\u6237\u7a7a\u95f4\u3002\u5982\u679c\u4e2d\u65ad\u53d1\u751f\u4e8e\u7cfb\u7edf\u7a7a\u95f4\uff0c\u63a7\u5236\u5c31\u76f4\u63a5\u8f6c\u79fb\u5230restore_all\uff0c\u800c\u5982\u679c\u53d1\u751f\u4e8e\u7528\u6237\u7a7a\u95f4\uff0c\u5219\u8f6c\u79fb\u5230ret_with_reschedule\u3002\u5728restore_all\u4e2d\u6062\u590d1\u4e2d\u4fdd\u5b58\u7684\u5bc4\u5b58\u5668\uff0c\u968f\u540e\u8c03\u7528iret\u6062\u590dEIP\u3001CS\u3001EFLAGS\u8fd4\u56de\u5230\u4e2d\u65ad\u53d1\u751f\u65f6\u7684\u72b6\u6001\u3002<\/p>\n<p>5. ret_with_reschedule\uff1a<\/p>\n<p>a. \u5982\u679c\u53d1\u73b0\u5f53\u524d\u8fdb\u7a0b\u7684need_resched==1\uff0c\u5219\u4f1a\u8c03\u7528schedule\uff1b<\/p>\n<p>b. \u5982\u679c\u53d1\u73b0\u8fd8\u6709\u5f85\u9700\u8981\u5904\u7406\u7684\u8f6f\u4e2d\u65ad\uff0c\u5219\u4f1a\u8c03\u7528do_softirq\uff1b<\/p>\n<\/p>\n<p>\u8bf4\u660e\uff1a\u80fd\u591f\u8d70\u5230ret_with_reschedule\u5904\uff0c\u4ece4\u4e2d\u53ef\u77e5\uff0c\u8be5\u4e2d\u65ad\u524d\u4e00\u5b9a\u4f4d\u4e8e\u7528\u6237\u5c42\uff0c\u800c\u4e14\u4e0d\u53ef\u80fd\u6709\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u6ca1\u6709\u6267\u884c\uff0c\u4e5f\u5c31\u662f\u8bf4\u5230\u8fbe\u8fd9\u91ccin_interrupt\u5fc5\u7136\u4e3a0\u3002\u4e3a\u4ec0\u4e48\u8fd9\u91cc\u8981\u8bf4\u4e0d\u53ef\u80fd\u6709\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u6ca1\u6709\u6267\u884c\u5462\uff1f\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u5fc5\u7136\u662f\u88ab\u4e2d\u65ad\u6216\u8005\u5f02\u5e38\u6240\u6253\u65ad\u7684\uff0c\u5f53\u540e\u8005\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u4ece4\u4e2d\u53ef\u77e5\uff0c\u7531\u4e8e\u540e\u8005\u53d1\u751f\u524d\u4f4d\u4e8e\u5185\u6838\u6001\uff08\u4e5f\u5c31\u662f\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u5904\u7406\u8fc7\u7a0b\u4e2d\u7684\u90a3\u4e2a\u70b9\uff09\uff0c\u6545\u63a7\u5236\u5c31\u76f4\u63a5\u8f6c\u79fb\u5230restore_all\uff0c\u5373\u8fd4\u56de\u5230\u4e86\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u88ab\u6253\u65ad\u65f6\u7684\u90a3\u4e2a\u70b9\uff0c\u7ee7\u7eed\u5904\u7406\u5b8c\u6bd5\uff0c\u53ef\u89c1\uff0c\u5230\u8fbe\u8fd9\u91cc\uff0c\u5fc5\u7136\u4e0d\u5b58\u5728\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u6216\u8f6f\u4e2d\u65ad\u672a\u88ab\u6267\u884c\u3002<\/p>\n<p>\u9644\u6ce8\uff1a\u5173\u4e8ein_interrupt\u5b8f\uff0c\u4e5f\u5c31\u662f(local_irq_count(__cpu) +local_bh_count(__cpu) !=0)\u3002\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u5bfc\u81f4\u8fdb\u5165do_softriq\u65f6\uff0cin_interrupt\u4e0d\u4e3a0\u5462\uff1f\u4e4b\u4e00\u79cd\uff0c\u5982\u679c\u5f53\u524d\u6b63\u5728\u5904\u7406\u53ef\u4e2d\u65ad\u7684\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u5047\u8bbe\u6b64\u65f6\u6765\u4e86\u53e6\u4e00\u4e2a\u901a\u9053\u7684\u786c\u4e2d\u65ad\uff0c\u5c06\u5bfc\u81f4\u5f53\u524d\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u88ab\u4e2d\u65ad\uff0c\u8fdb\u5165do_IRQ\uff0c\u968f\u540e\u5904\u7406\u65b0\u6765\u7684\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u5f53\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u5230\u8fbedo_softirq\uff0c\u75312\u4e2d\u53ef\u77e5\uff0c\u6b64\u65f6local_irq_count(__cpu)\u88ab\u539f\u5148\u7684\u786c\u4e2d\u65ad\u52a01\uff0c\u7531\u4e8e\u5176\u8fd8\u6ca1\u6709\u5904\u7406\u5b8c\u6bd5\uff0c\u6545\u2013local_irq_count(cpu)\u8fd8\u6ca1\u6765\u5f97\u53ca\u6267\u884c\uff0c\u56e0\u6b64local_irq_count(__cpu)&gt;0\uff0c\u4e5f\u5c31\u662fin_interrupt\uff01=0\uff1b\u7b2c\u4e8c\u79cd\uff0c\u5982\u679c\u5f53\u524d\u6b63\u5728do_softirq\u4e2d\u5904\u7406\u8f6f\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u73b0\u5728\u6765\u4e86\u4e2a\u786c\u4e2d\u65ad\uff0c\u5c06\u5bfc\u81f4\u5f53\u524d\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\u88ab\u4e2d\u65ad\uff0c\u8fdb\u5165do_IRQ\uff0c\u968f\u540e\u5904\u7406\u65b0\u6765\u7684\u786c\u4e2d\u65ad\u5904\u7406\u51fd\u6570\uff0c\u5f53\u5904\u7406\u5b8c\u6bd5\u540e\uff0c\u53c8\u6765\u5e26\u5230\u4e86do_softirq\uff0c\u75313\u4e2d\u53ef\u77e5\uff0c\u6b64\u65f6local_bh_count(cpu)\u88ab\u524d\u4e00\u4e2ado_softirq\u52a01\u4e86\uff0c\u4f46\u662f\u7531\u4e8e\u5176\u662f\u4e2d\u9014\u88ab\u4e2d\u65ad\u7684\uff0c\u6545local_bh_count(cpu)\u2013\u8fd8\u6ca1\u6765\u5f97\u53ca\u6267\u884c\uff0c\u56e0\u6b64local_bh_count(__cpu)&gt;0\uff0c\u4e5f\u5c31\u662fin_interrupt\uff01=0\uff1b\u7b2c\u4e09\u79cd\u5c31\u662f\u7efc\u5408\u4e4b\u4e00\u79cd\u548c\u7b2c\u4e8c\u79cd\u4e24\u79cd\u60c5\u51b5\u3002<\/p>\n<p>\u9996\u5148\u539f\u5b50\u64cd\u4f5c\u662f\u901a\u8fc7local_irq_enable()\u8fd9\u4e2a\u5b8f\u6765\u5b9e\u73b0\uff0c\u8fd9\u4e2a\u5b8f\u5b9e\u73b0\u4e86\u786c\u4ef6\u4e2d\u65ad\u548c\u8f6f\u4ef6\u4e2d\u65ad\u7684\u5c4f\u853d\u3002\u8fd9\u6837CPU\u5c31\u4e0d\u80fd\u88ab\u8f6f\u4ef6\u4e2d\u65ad\uff0c\u5982\u7ebf\u7a0b\u62a2\u5360\u3002\u800c\u5f53\u786c\u4ef6\u4e2d\u65ad\u4ea7\u751f\u65f6\uff0c\u4f1a\u5c06\u5176\u7ed3\u679c\u4fdd\u5b58\u5230\u4e2d\u65ad\u63a7\u5236\u5668\u7684SRCPND(resource-pend)\u5bc4\u5b58\u5668\u4e2d\uff0c\u7136\u540e\u5c06SRCPND\u7684\u5185\u5bb9\u9001\u53bb\u505a\u4e2d\u65ad\u5c4f\u853d\u68c0\u6d4b\uff0c\u8fd9\u4e00\u5de5\u4f5c\u7531\u8bbe\u7f6eMASK\u5bc4\u5b58\u5668\u4f0f\u795e\u624b\u76f8\u5e94\u7684\u4f4d\u5b8c\u6210\u7f3a\u5acc\uff0c\u5982\u679c\u5168\u90e8\u5c4f\u853d\uff0c\u786c\u4ef6\u4e2d\u65ad\u5c31\u4e0d\u4f1a\u4ea7\u751f\u4e86\u3002\u5f53\u7136\u4e86\uff0c\u6bcf\u79cd\u5904\u7406\u778e\u5b5d\u5668\u90fd\u6709\u81ea\u5df1\u7684\u4e2d\u65ad\u5904\u7406\u65b9\u6cd5\uff0c\u901a\u5e38\u7684\u6d41\u7a0b\u662f\u8fd9\u6837\u3002<\/p>\n<p>\u5173\u4e8elinux 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\u662f\u4e00\u6b3e\u975e\u5e38\u7a33\u5b9a\u53ef\u9760\u7684\u64cd\u4f5c\u7cfb\u7edf\uff0c\u4f46\u662f\u968f\u7740\u8f6f\u4ef6\u7684\u4e0d\u65ad\u5347\u7ea7\u548c\u5404\u79cd\u5e94\u7528\u7a0b\u5e8f\u7684\u666e\u53ca\uff0cLinux \u62a5\u9519\u4e5f\u65e5\u76ca\u5e38 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[34],"tags":[],"class_list":["post-135041","post","type-post","status-publish","format-standard","hentry","category-linux"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/135041","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=135041"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/135041\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=135041"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=135041"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=135041"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}