{"id":7723,"date":"2024-10-22T18:45:53","date_gmt":"2024-10-22T10:45:53","guid":{"rendered":"https:\/\/www.wangonc.com\/?p=7723"},"modified":"2024-10-22T19:18:44","modified_gmt":"2024-10-22T11:18:44","slug":"blue-fox-arm-assembly-internals-reverse-engineering-chapter-2-thread-local-storagecove","status":"publish","type":"post","link":"https:\/\/www.wangonc.com\/index.php\/2024\/10\/22\/blue-fox-arm-assembly-internals-reverse-engineering-chapter-2-thread-local-storagecove\/","title":{"rendered":"\u7ffb\u8bd1\u300aARM\u6c47\u7f16\u4e0e\u9006\u5411\u5de5\u7a0b \u84dd\u72d0\u5377\u300b\u7b2c\u4e8c\u7ae0 \u7ebf\u7a0b\u672c\u5730\u5b58\u50a8"},"content":{"rendered":"

\u539f\u6587\uff1a\u300aBlue Fox: Arm Assembly Internals & Reverse Engineering\u300b Maria Markstedter\u2014\u2014 Chapter 2: ELF File Format Internals\u2014\u2014Thread\u2010Local StorageCover<\/strong><\/p>\n

\u4e3b\u8981\u5185\u5bb9\u7531o1-mini\u7ffb\u8bd1\uff0c\u672c\u4eba\u8ba2\u6b63<\/p>\n

\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8<\/h2>\n

\u9664\u4e86\u5168\u5c40\u6570\u636e\u53d8\u91cf\uff0cC \u548c C++ \u7a0b\u5e8f\u8fd8\u53ef\u4ee5\u5b9a\u4e49\u7ebf\u7a0b\u672c\u5730\u6570\u636e\u53d8\u91cf\u3002\u5bf9\u4e8e\u7a0b\u5e8f\u5458\u6765\u8bf4\uff0c\u7ebf\u7a0b\u672c\u5730\u5168\u5c40\u53d8\u91cf\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u770b\u8d77\u6765\u548c\u884c\u4e3a\u4e0a\u4e0e\u666e\u901a\u7684\u5168\u5c40\u53d8\u91cf\u51e0\u4e4e\u5b8c\u5168\u76f8\u540c\uff0c\u552f\u4e00\u7684\u533a\u522b\u662f\u5b83\u4eec\u4f7f\u7528 C++ \u4e2d\u7684 __thread_local<\/code> \u5173\u952e\u5b57\u6216 GNU \u6269\u5c55\u5173\u952e\u5b57 __thread<\/code> \u8fdb\u884c\u6ce8\u91ca\u3002<\/p>\n

\u4e0e\u4f20\u7edf\u7684\u5168\u5c40\u53d8\u91cf\u4e0d\u540c\uff0c\u4f20\u7edf\u5168\u5c40\u53d8\u91cf\u5728\u6574\u4e2a\u7a0b\u5e8f\u4e2d\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u6240\u6709\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u8bfb\u53d6\u548c\u5199\u5165\u5b83\uff0c\u800c\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u4f1a\u4e3a\u81ea\u5df1\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u7ef4\u62a4\u4e00\u4e2a\u72ec\u7279\u7684\u5b58\u50a8\u4f4d\u7f6e\u3002\u56e0\u6b64\uff0c\u5bf9\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u7684\u8bfb\u53d6\u548c\u5199\u5165\u5bf9\u7a0b\u5e8f\u4e2d\u7684\u5176\u4ed6\u7ebf\u7a0b\u662f\u4e0d\u53ef\u89c1\u7684\u3002<\/p>\n

\u5728\u56fe 2.2 \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u7a0b\u5e8f\u8bbf\u95ee\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u4e0e\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf\u7684\u533a\u522b\u3002\u5728\u8fd9\u91cc\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u5c06\u5168\u5c40\u53d8\u91cf\u89c6\u4e3a\u5f15\u7528\u76f8\u540c\u7684\u5185\u5b58\u5730\u5740\u3002\u56e0\u6b64\uff0c\u4e00\u4e2a\u7ebf\u7a0b\u5bf9\u8be5\u53d8\u91cf\u7684\u5199\u64cd\u4f5c\u5bf9\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u662f\u53ef\u89c1\u7684\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u4e24\u4e2a\u7ebf\u7a0b\u770b\u5230\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u5219\u7531\u4e0d\u540c\u7684\u5185\u5b58\u5730\u5740\u652f\u6301\u3002\u5bf9\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u7684\u5199\u64cd\u4f5c\u4e0d\u4f1a\u6539\u53d8\u7a0b\u5e8f\u4e2d\u5176\u4ed6\u7ebf\u7a0b\u6240\u770b\u5230\u7684\u8be5\u53d8\u91cf\u7684\u503c\u3002<\/p>\n

\u4e0e\u666e\u901a\u7684\u5168\u5c40\u53d8\u91cf\u4e00\u6837\uff0c\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u53ef\u4ee5\u4ece\u5171\u4eab\u5e93\u4f9d\u8d56\u4e2d\u5bfc\u5165\u3002\u4f8b\u5982\uff0c\u4f17\u6240\u5468\u77e5\u7684 errno<\/code> \u53d8\u91cf\uff0c\u7528\u4e8e\u8ddf\u8e2a\u5404\u79cd\u6807\u51c6\u5e93\u51fd\u6570\u7684\u9519\u8bef\uff0c\u662f\u4e00\u4e2a\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf1<\/a><\/sup>\u3002\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u53ef\u4ee5\u88ab\u96f6\u521d\u59cb\u5316\u6216\u9759\u6001\u521d\u59cb\u5316\u3002<\/p>\n

\"Figure<\/div><\/p>
\u56fe2.2\uff1a\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u4e0e\u5168\u5c40\u53d8\u91cf<\/figcaption>

\u4e3a\u4e86\u4e86\u89e3\u5b83\u5982\u4f55\u5de5\u4f5c\uff0c\u601d\u8003\u4ee5\u4e0b\u7a0b\u5e8f tls.c\uff0c\u5b83\u5b9a\u4e49\u4e86\u4e24\u4e2a TLS \u672c\u5730\u53d8\u91cf\uff0cmyThreadLocal<\/code> \u548c myUninitializedLocal<\/code>\u3002<\/p>\n

__thread int myThreadLocal = 3;\n__thread int myUninitializedLocal;\nint main() { return 0; }\n<\/code><\/pre>\n
\u8ba9\u6211\u4eec\u7f16\u8bd1\u8fd9\u4e2a\u7a0b\u5e8f\uff0c\u5e76\u4f7f\u7528 readelf \u67e5\u770b\u7a0b\u5e8f\u7684\u60c5\u51b5\u3002<\/p>\n
user@arm64:~$ gcc tls.c -o tls.so\nuser@arm64:~$ readelf -lW tls.so \nElf file type is DYN (Shared object file)  \nEntry point 0x650 \nThere are 10 program headers, starting at offset 64\n\nProgram Headers: \n  Type         Offset       VirtAddr    PhysAddr  FileSiz    MemSiz    Flg   Align \n  PHDR         0x000040     0x\u202640       0x\u202640     0x000230   0x000230  R     0x8 \n  INTERP       0x000270     0x\u2026270      0x\u2026270    0x00001b   0x00001b  R     0x1 \n      [Requesting program interpreter: \/lib\/ld-linux-aarch64.so.1] \n  LOAD         0x000000     0x\u202600       0x\u202600     0x00091c   0x00091c  R E    \u2026\n  LOAD         0x000db4     0x\u202610db4    0x\u202610db4  0x00027c   0x000284  RW     \u2026\n  DYNAMIC      0x000dc8     0x\u202610dc8    0x\u202610dc8  0x0001e0   0x0001e0  RW     0x8 \n  NOTE         0x00028c     0x\u202628c      0x\u202628c    0x000044   0x000044  R      0x4 \n  TLS          0x000db4     0x\u202610db4    0x\u202610db4  0x000004   0x000008  R      0x4 \n  GNU_EH_FRAME 0x0007f8     0x\u20267f8      0x\u20267f8    0x000044   0x000044         \u2026 \n  GNU_STACK    0x000000     0x\u202600       0x\u202600     0x000000   0x000000  RW     0x10 \n  GNU_RELRO    0x000db4     0x\u202610db4    0x\u202610db4  0x00024c   0x00024c  R      0x1 \nSection to Segment mapping: \n  Segment Sections\u2026 \n   00 \n   01     .interp \n   02     .interp .note.ABI-tag .note.gnu.build-id .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .init .plt .text .fini .rodata .eh_frame_hdr .eh_frame\n   03     .tdata .init_array .fini_array .dynamic .got .got.plt .data .bss \n   04     .dynamic \n   05     .note.ABI-tag .note.gnu.build-id \n   06     .tdata .tbss  \n   07     .eh_frame_hdr \n   08 \n   09     .tdata .init_array .fini_array .dynamic .got\n<\/code><\/pre>\n
\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u7a0b\u5e8f\u73b0\u5728\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5305\u542b\u4e24\u4e2a\u903b\u8f91\u90e8\u5206\u7684 TLS \u7a0b\u5e8f\u5934\uff1a.tdata \u548c .tbss\u3002<\/p>\n
\u7a0b\u5e8f\u4e2d\u5b9a\u4e49\u7684\u6bcf\u4e2a\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u5728 ELF \u6587\u4ef6\u7684 TLS \u8868\u4e2d\u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684\u6761\u76ee\uff0c\u8be5\u8868\u7531 TLS \u7a0b\u5e8f\u5934\u5f15\u7528\u3002\u8fd9\u4e2a\u6761\u76ee\u6307\u5b9a\u4e86\u6bcf\u4e2a\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u7684\u5b57\u8282\u5927\u5c0f\uff0c\u5e76\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u5206\u914d\u4e86\u4e00\u4e2a\u201cTLS \u504f\u79fb\u91cf\u201d\uff0c\u5373\u8be5\u53d8\u91cf\u5728\u7ebf\u7a0b\u672c\u5730\u6570\u636e\u533a\u57df\u4e2d\u4f7f\u7528\u7684\u504f\u79fb\u91cf\u3002<\/p>\n
\u60a8\u53ef\u4ee5\u901a\u8fc7\u7b26\u53f7\u8868\u67e5\u770b\u8fd9\u4e9b\u53d8\u91cf\u7684\u786e\u5207 TLS \u504f\u79fb\u91cf\u3002_TLS_MODULE_BASE<\/code> \u662f\u4e00\u4e2a\u7b26\u53f7\uff0c\u7528\u4e8e\u5f15\u7528\u7ed9\u5b9a\u6a21\u5757\u7684\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff08TLS\uff09\u6570\u636e\u7684\u57fa\u5730\u5740\u3002\u8fd9\u4e2a\u7b26\u53f7\u7528\u4f5c\u7ed9\u5b9a\u6a21\u5757\u7684 TLS \u6570\u636e\u7684\u57fa\u6307\u9488\uff0c\u5e76\u6307\u5411\u5305\u542b\u8be5\u6a21\u5757\u6240\u6709\u7ebf\u7a0b\u672c\u5730\u6570\u636e\u7684\u5185\u5b58\u533a\u57df\u7684\u8d77\u59cb\u4f4d\u7f6e\u3002$d \u662f\u4e00\u4e2a\u6620\u5c04\u7b26\u53f7\u3002\u9664\u4e86\u8fd9\u4e24\u79cd\u7279\u6b8a\u60c5\u51b5\u4e4b\u5916\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u7684\u7a0b\u5e8f\u53ea\u5305\u542b\u4e86\u4e24\u4e2a\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\uff0c\u5176\u4e2d myThreadLocal<\/code> \u7684 TLS \u504f\u79fb\u91cf\u4e3a 0\uff0cmyUninitializedLocal<\/code> \u7684 TLS \u504f\u79fb\u91cf\u4e3a 4\u3002<\/p>\n
user@arm64:~$  readelf -s a.out  | grep TLS  \n    55: 0000000000000000     0 TLS     LOCAL  DEFAULT   18 $d  \n    56: 0000000000000004     0 TLS     LOCAL  DEFAULT   19 $d  \n    72: 0000000000000000     0 TLS     LOCAL  DEFAULT   18 _TLS_MODULE_BASE_  \n    76: 0000000000000000     4 TLS     GLOBAL DEFAULT   18 myThreadLocal  \n    92: 0000000000000004     4 TLS     GLOBAL DEFAULT   19 myUninitializedLocal  <\/code><\/pre>\n
\u5982\u679c\u672c\u5730\u53d8\u91cf\u662f\u9759\u6001\u521d\u59cb\u5316\u7684\uff0c\u8be5\u53d8\u91cf\u5bf9\u5e94\u7684 TLS \u6761\u76ee\u4e5f\u4f1a\u6307\u5411\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a ELF \u6587\u4ef6\u7684 .tdata \u90e8\u5206\u4e2d\u7684\u8be5\u672c\u5730\u53d8\u91cf\u7684\u201c\u521d\u59cb\u6a21\u677f\u201d\u3002\u672a\u521d\u59cb\u5316\u7684 TLS \u6761\u76ee\u6307\u5411 .tbss \u6570\u636e\u90e8\u5206\uff0c\u4ece\u800c\u907f\u514d\u5728 ELF \u6587\u4ef6\u4e2d\u5b58\u50a8\u591a\u4f59\u7684\u96f6\u3002\u5c06\u8fd9\u4e24\u4e2a\u533a\u57df\u8fde\u63a5\u8d77\u6765\u5f62\u6210\u7a0b\u5e8f\u6216\u5171\u4eab\u5e93\u7684 TLS \u521d\u59cb\u5316\u955c\u50cf\u3002\u5728\u6211\u4eec\u7684\u793a\u4f8b\u4e2d\uff0c\u8fd9\u610f\u5473\u7740\u7a0b\u5e8f\u7684 TLS \u521d\u59cb\u5316\u955c\u50cf\u5c06\u662f\u516b\u5b57\u8282\u5e8f\u5217 03 00 00 00 00 00 00 00<\/code>2<\/a><\/sup>\u3002<\/p>\n
\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\u7684\u8fd0\u884c\u65f6\u673a\u5236\u53ef\u80fd\u6709\u70b9\u590d\u6742\uff0c\u4f46\u57fa\u672c\u5982\u4e0b\uff0c\u5e76\u5728\u56fe 2.3 \u4e2d\u5c55\u793a\uff1a
\n
\"file\"<\/div><\/p>
\u56fe2.3\uff1a\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\u7684\u8fd0\u884c\u65f6\u673a\u5236<\/figcaption>
\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u8bbf\u95ee\u4e00\u4e2a\u7ebf\u7a0b\u6307\u9488\u5bc4\u5b58\u5668\u3002\u5728 64 \u4f4d Arm \u4e0a\uff0c\u8fd9\u4e2a\u5bc4\u5b58\u5668\u662f\u7cfb\u7edf\u7684 TPIDR_EL0 \u5bc4\u5b58\u5668\uff0c\u800c\u5728 32 \u4f4d Arm \u4e0a\uff0c\u5b83\u662f\u7cfb\u7edf\u7684 TPIDRURW<\/code> \u5bc4\u5b58\u56683<\/a><\/sup>\u3002<\/p>\n
\u7ebf\u7a0b\u6307\u9488\u5bc4\u5b58\u5668\u6307\u5411\u4e3a\u8be5\u7ebf\u7a0b\u5206\u914d\u7684\u7ebf\u7a0b\u63a7\u5236\u5757\uff08TCB\uff09\u3002\u5728 64 \u4f4d Arm \u4e0a\uff0cTCB \u4e3a 16 \u5b57\u8282\uff0c\u5728 32 \u4f4d Arm \u4e0a\u4e3a 8 \u5b57\u8282\u3002<\/p>\n
\u7d27\u63a5\u7740 TCB \u540e\u9762\u7684\u662f\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\uff0c\u5373\u4ece\u7ebf\u7a0b\u6307\u9488\u6301\u6709\u7684\u5730\u5740\u5f00\u59cb\u7684\u5b57\u8282\u504f\u79fb 16\uff08\u6216\u5728 32 \u4f4d\u4e0a\u4e3a 8\uff09\u3002<\/p>\n
\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u5171\u4eab\u5e93\u4f9d\u8d56\u9879\u7684 TLS \u533a\u57df\u968f\u540e\u5b58\u50a8\u3002<\/p>\n
TCB \u8fd8\u5728 TCB \u7684\u504f\u79fb\u91cf\u96f6\u5904\u7ef4\u62a4\u4e00\u4e2a\u6307\u5411 DTV \u6570\u7ec4\u7684\u6307\u9488\u3002DTV \u6570\u7ec4\u4ee5\u4e00\u4e2a\u751f\u6210\u5b57\u6bb5\u5f00\u59cb\uff0c\u4f46\u9664\u6b64\u4e4b\u5916\uff0c\u5b83\u662f\u6307\u5411\u6bcf\u4e2a\u5e93\u7684\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\u7684\u6307\u9488\u6570\u7ec4\u3002<\/p>\n
\u4f7f\u7528 dlopen \u5728\u8fd0\u884c\u65f6\u52a0\u8f7d\u7684\u5e93\u76f8\u5173\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u88ab\u5206\u914d\u5728\u5355\u72ec\u7684\u5b58\u50a8\u4e2d\uff0c\u4f46\u4ecd\u7531 DTV \u6570\u7ec4\u6307\u5411\u3002<\/p>\n
\u8fd9\u79cd TLS \u5b9e\u73b0\u65b9\u6848\u4e0d\u4ec5\u5141\u8bb8\u7a0b\u5e8f\u8bbf\u95ee\u5176\u81ea\u8eab\u7a0b\u5e8f\u6a21\u5757\u4e2d\u5b9a\u4e49\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\uff0c\u8fd8\u5141\u8bb8\u8bbf\u95ee\u5728\u5171\u4eab\u5e93\u4e2d\u5b9a\u4e49\u7684\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u3002\u5728\u7f16\u8bd1\u65f6\uff0c\u5f53\u9047\u5230\u5bf9\u7ebf\u7a0b\u672c\u5730\u53d8\u91cf\u7684\u52a0\u8f7d\u6216\u5b58\u50a8\u65f6\uff0c\u7f16\u8bd1\u5668\u5c06\u4f7f\u7528\u56db\u79cd TLS \u8bbf\u95ee\u6a21\u578b\u4e4b\u4e00\u6765\u53d1\u51fa TLS \u8bbf\u95ee\u3002\u7f16\u8bd1\u5668\u901a\u5e38\u6839\u636e\u8868 2.8 \u4e2d\u7684\u4fe1\u606f\u9009\u62e9\u8fd9\u79cd\u6a21\u578b\uff0c\u4f46\u4e5f\u53ef\u4ee5\u4f7f\u7528 -ftls-model \u547d\u4ee4\u884c\u9009\u9879\u624b\u52a8\u8986\u76d6\uff0c\u6216\u8005\u901a\u8fc7 C \u548c C++ \u4e2d\u7684 __attribute__((tls_model("name")))<\/code>\u5c5e\u6027\u6309\u6bcf\u4e2a\u53d8\u91cf\u8fdb\u884c\u8986\u76d64<\/a><\/sup>\u3002<\/p>\n
\u8868 2.8 \u63cf\u8ff0\u4e86\u8fd9\u4e9b\u6a21\u578b\u53ca\u5176\u7ea6\u675f\uff0c\u8868\u4e2d\u8f83\u9ad8\u7684\u6761\u76ee\u6bd4\u8868\u4e2d\u8f83\u4f4e\u7684\u6761\u76ee\u5177\u6709\u66f4\u9ad8\u7684\u8fd0\u884c\u65f6\u6548\u7387\u3002<\/p>\n
\u8868 2.8: TLS \u6a21\u578b<\/strong><\/p>\n\n\n\n\n\n\n\n\n
TLS \u6a21\u578b<\/th>\n\u88ab\u7f16\u8bd1\u7684\u6a21\u5757<\/th>\n\u8bbf\u95ee\u7684\u53d8\u91cf\u5b9a\u4e49\u5728<\/th>\n<\/tr>\n<\/thead>\n
local-exec<\/td>\n\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n<\/tr>\n
initial-exec<\/td>\n\u4efb\u4f55\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u4efb\u4f55\u9759\u6001\u4f9d\u8d56<\/td>\n<\/tr>\n
local-dynamic<\/td>\n\u4efb\u4f55\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u5b9a\u4e49\u5728\u76f8\u540c\u7684\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e2d<\/td>\n<\/tr>\n
global-dynamic<\/td>\n\u4efb\u4f55\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n\u4efb\u4f55\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
Local-Exec TLS \u8bbf\u95ee\u6a21\u578b<\/h2>\n
Local-Exec \u6a21\u578b\u662f\u6700\u5feb\u4f46\u6700\u53d7\u9650\u5236\u7684 TLS \u8bbf\u95ee\u6a21\u578b\uff0c\u4ec5\u5728\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u8bbf\u95ee\u5176\u81ea\u8eab\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e2d\u5b9a\u4e49\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u65f6\u53ef\u7528\u3002<\/p>\n
Local-Exec \u6a21\u578b\u57fa\u4e8e\u4ee5\u4e0b\u89c2\u5bdf\uff1a\u7ed9\u5b9a\u7ebf\u7a0b\u7684\u7ebf\u7a0b\u6307\u9488\u76f4\u63a5\u6307\u5411\u8be5\u7ebf\u7a0b\u7684 TCB\uff08\u7ebf\u7a0b\u63a7\u5236\u5757\uff09\uff0c\u5728 TCB \u5143\u6570\u636e\u4e4b\u540e\u662f\u5f53\u524d\u7ebf\u7a0b\u7684\u4e3b\u7a0b\u5e8f\u7ebf\u7a0b\u5c40\u90e8\u6570\u636e\u3002\u5bf9\u4e8e 64 \u4f4d\u7a0b\u5e8f\uff0c\u8fd9\u4e2a TCB \u5143\u6570\u636e\u662f 16 \u5b57\u8282\uff1b\u5bf9\u4e8e 32 \u4f4d\u7a0b\u5e8f\uff0c\u5219\u662f 8 \u5b57\u8282\u3002\u8fd9\u610f\u5473\u7740\u5728 TLS \u504f\u79fb\u91cf 4 \u5904\u8bbf\u95ee\u4e00\u4e2a\u53d8\u91cf\uff0c\u4f8b\u5982\uff0c\u5728 64 \u4f4d\u7cfb\u7edf\u4e0a\uff0c\u5c06\u6309\u4ee5\u4e0b\u65b9\u5f0f\u8fdb\u884c\uff1a<\/p>\n
    \n
  1. \u8bbf\u95ee\u5f53\u524d\u7ebf\u7a0b\u7684\u7ebf\u7a0b\u5c40\u90e8\u6307\u9488\u3002<\/li>\n
  2. \u5728\u6b64\u503c\u4e0a\u52a0\u4e0a 16 \u6216 8\uff0c\u4ee5\u8df3\u8fc7 TCB\uff0c\u518d\u52a0\u4e0a 4\uff0c\u8fd9\u662f\u53d8\u91cf\u7684 TLS \u504f\u79fb\u91cf\u3002<\/li>\n
  3. \u4ece\u8be5\u5730\u5740\u8bfb\u53d6\u6216\u5199\u5165\u4ee5\u8bbf\u95ee\u53d8\u91cf\u3002<\/li>\n<\/ol>\n
    \u6b64\u6a21\u578b\u4ec5\u9002\u7528\u4e8e\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u3002\u5171\u4eab\u5e93\u65e0\u6cd5\u4f7f\u7528\u6b64\u65b9\u6cd5\uff0c\u4e3b\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e5f\u65e0\u6cd5\u4f7f\u7528\u6b64\u6a21\u578b\u8bbf\u95ee\u5728\u5171\u4eab\u5e93\u4e2d\u5b9a\u4e49\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u3002\u5bf9\u4e8e\u8fd9\u4e9b\u8bbf\u95ee\uff0c\u5fc5\u987b\u4f7f\u7528\u5176\u4ed6\u8bbf\u95ee\u6a21\u578b\u3002<\/p>\n
    Initial-Exec TLS \u8bbf\u95ee\u6a21\u578b<\/h2>\n
    Initial-Exec TLS \u8bbf\u95ee\u6a21\u578b\u7528\u4e8e\u8bbf\u95ee\u5b9a\u4e49\u5728\u7a0b\u5e8f\u521d\u59cb\u5316\u5e8f\u5217\u671f\u95f4\u52a0\u8f7d\u7684\u5171\u4eab\u5e93\u4e2d\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\uff0c\u5373\u4e0d\u662f\u901a\u8fc7 dlopen<\/code> \u5728\u8fd0\u884c\u65f6\u52a0\u8f7d\u7684\u5171\u4eab\u5e93\u4e2d\u7684\u53d8\u91cf\u3002\u8fd9\u4e2a\u6a21\u578b\u6709\u4e25\u683c\u7684\u8981\u6c42\uff0c\u56e0\u6b64\u4ee5\u8fd9\u79cd\u65b9\u5f0f\u7f16\u8bd1\u7684\u7a0b\u5e8f\u4f1a\u5728\u5176\u52a8\u6001\u8282\u4e2d\u8bbe\u7f6e DF_STATIC_TLS<\/code> \u6807\u5fd7\uff0c\u4ee5\u963b\u6b62\u901a\u8fc7 dlopen<\/code> \u52a0\u8f7d\u5e93\u3002<\/p>\n
    \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u7a0b\u5e8f\u5728\u7f16\u8bd1\u65f6\u65e0\u6cd5\u786e\u5b9a\u88ab\u8bbf\u95ee\u53d8\u91cf\u7684 TLS \u504f\u79fb\u91cf\u3002\u7a0b\u5e8f\u901a\u8fc7\u4f7f\u7528 TLS \u91cd\u5b9a\u4f4d\u6765\u89e3\u51b3\u8fd9\u79cd\u4e0d\u786e\u5b9a\u6027\u3002\u52a0\u8f7d\u5668\u4f7f\u7528\u8fd9\u79cd\u91cd\u5b9a\u4f4d\u6765\u901a\u77e5\u7a0b\u5e8f\u8de8\u8fb9\u754c\u8bbf\u95ee\u7684\u53d8\u91cf\u7684 TLS \u504f\u79fb\u91cf\u3002\u56e0\u6b64\uff0c\u5728\u8fd0\u884c\u65f6\uff0c\u8bbf\u95ee\u8be5\u53d8\u91cf\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n
      \n
    1. \u8bbf\u95ee\u7ebf\u7a0b\u6307\u9488\u3002<\/li>\n
    2. \u52a0\u8f7d\u7531\u5bf9\u5e94\u53d8\u91cf\u7684 TLS \u91cd\u5b9a\u4f4d\u653e\u7f6e\u5728\u5168\u5c40\u504f\u79fb\u8868\u4e2d\u7684 TLS \u504f\u79fb\u503c\u3002<\/li>\n
    3. \u5c06\u4e24\u8005\u76f8\u52a0\u3002<\/li>\n
    4. \u4ece\u8be5\u6307\u9488\u8bfb\u53d6\u6216\u5199\u5165\u4ee5\u8bbf\u95ee\u53d8\u91cf\u3002<\/li>\n<\/ol>\n
      General-Dynamic TLS \u8bbf\u95ee\u6a21\u578b<\/h2>\n
      General-Dynamic TLS \u8bbf\u95ee\u6a21\u578b\u662f\u6700\u901a\u7528\u4f46\u4e5f\u662f\u6700\u6162\u7684\u8bbf\u95ee TLS \u53d8\u91cf\u7684\u65b9\u5f0f\u3002\u8be5\u6a21\u578b\u53ef\u4ee5\u7531\u4efb\u4f55\u7a0b\u5e8f\u6a21\u5757\u4f7f\u7528\uff0c\u4ee5\u8bbf\u95ee\u5728\u4efb\u4f55\u6a21\u5757\u4e2d\u5b9a\u4e49\u7684 TLS \u53d8\u91cf\uff0c\u5305\u62ec\u5176\u81ea\u8eab\u6216\u5176\u4ed6\u5730\u65b9\u5b9a\u4e49\u7684\u53d8\u91cf\u3002<\/p>\n
      \u4e3a\u4e86\u5b9e\u73b0\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u7a0b\u5e8f\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3a __tls_get_addr<\/code> \u7684\u8f85\u52a9\u51fd\u6570\u3002\u8be5\u51fd\u6570\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u662f\u6307\u5411\u5305\u542b\u6a21\u5757 ID \u548c\u88ab\u8bbf\u95ee\u53d8\u91cf\u7684 TLS \u504f\u79fb\u91cf\u7684\u4e00\u5bf9\u6574\u6570\u7684\u6307\u9488\uff0c\u5e76\u8fd4\u56de\u8be5\u7ed3\u6784\u5f15\u7528\u7684\u786e\u5207\u7ebf\u7a0b\u672c\u5730\u5730\u5740\u3002\u8fd9\u4e9b\u7ed3\u6784\u672c\u8eab\u5b58\u50a8\u5728\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u7684\u5168\u5c40\u504f\u79fb\u8868\uff08GOT\uff09\u90e8\u5206\u4e2d\u3002\u8be5\u7ed3\u6784\u4e2d\u7684\u6a21\u5757 ID \u662f\u4e0e\u6211\u4eec\u6b63\u5728\u8fd0\u884c\u7684\u6a21\u5757\u5bf9\u5e94\u7684 DTV \u7ed3\u6784\u4e2d\u7684\u552f\u4e00\u7d22\u5f15\u3002\u7ed3\u6784\u5b9a\u4e49\u5982\u4e0b\uff0c\u5e76\u4e14\u5728 32 \u4f4d\u548c 64 \u4f4d Arm \u4e0a\u76f8\u540c5<\/a><\/sup>\uff1a<\/p>\n
      typedef struct dl_tls_index\n{\n  unsigned long int ti_module;\n  unsigned long int ti_offset;\n} tls_index;<\/code><\/pre>\n
      \u5f53\u7136\uff0c\u81ea\u7136\u7684\u95ee\u9898\u662f\u7a0b\u5e8f\u5728\u7f16\u8bd1\u65f6\u5982\u4f55\u77e5\u9053\u53d8\u91cf\u7684 TLS \u6a21\u5757 ID \u6216 TLS \u504f\u79fb\u91cf\u3002\u5bf9\u4e8e\u6211\u4eec\u81ea\u5df1\u7a0b\u5e8f\u4e8c\u8fdb\u5236\u6587\u4ef6\u4e2d\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\uff0cTLS \u504f\u79fb\u91cf\u53ef\u80fd\u662f\u5df2\u77e5\u7684\uff0c\u4f46\u5bf9\u4e8e\u5916\u90e8\u7b26\u53f7\uff0c\u8fd9\u5728\u8fd0\u884c\u65f6\u4e4b\u524d\u662f\u65e0\u6cd5\u77e5\u9053\u7684\u3002<\/p>\n
      \u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cELF \u6587\u4ef6\u91cd\u65b0\u5229\u7528\u4e86\u91cd\u5b9a\u4f4d\u3002\u53ef\u80fd\u7684\u91cd\u5b9a\u4f4d\u7c7b\u578b\u975e\u5e38\u591a\uff0c\u4f46\u8868 2.9 \u4e2d\u663e\u793a\u7684\u91cd\u5b9a\u4f4d\u7c7b\u578b\u57fa\u672c\u4e0a\u5c55\u793a\u4e86\u8fd9\u4e00\u8fc7\u7a0b\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n
      \u8868 2.9: Arm ELF \u6587\u4ef6\u7684\u57fa\u672c TLS \u91cd\u5b9a\u4f4d\u7c7b\u578b<\/strong><\/p>\n\n\n\n\n\n\n\n\n\n\n
      TLS \u91cd\u5b9a\u4f4d\u7c7b\u578b<\/th>\n\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n
      R_ARM_TLS_DTPMOD32<\/td>\n\u5199\u5165\u4e0e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7b26\u53f7\u5bf9\u5e94\u7684\u6a21\u5757 ID\uff08\u5982\u679c\u7b26\u53f7\u4e3a\u7a7a\uff0c\u5219\u5199\u5165\u88ab\u52a0\u8f7d\u6a21\u5757\u7684\u6a21\u5757 ID\uff09\u3002<\/td>\n<\/tr>\n
      R_AARCH64_TLS_DTPMOD<\/td>\n\u5199\u5165\u4e0e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7b26\u53f7\u5bf9\u5e94\u7684\u6a21\u5757 ID\uff08\u5982\u679c\u7b26\u53f7\u4e3a\u7a7a\uff0c\u5219\u5199\u5165\u88ab\u52a0\u8f7d\u6a21\u5757\u7684\u6a21\u5757 ID\uff09\u3002<\/td>\n<\/tr>\n
      R_ARM_TLS_DTPOFF32<\/td>\n\u5199\u5165\u4e0e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7b26\u53f7\u5bf9\u5e94\u7684 TLS \u504f\u79fb\u91cf\u3002<\/td>\n<\/tr>\n
      R_AARCH64_TLS_DTPOFF<\/td>\n\u5199\u5165\u4e0e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7b26\u53f7\u5bf9\u5e94\u7684 TLS \u504f\u79fb\u91cf\u3002<\/td>\n<\/tr>\n
      R_ARM_TLS_TPOFF32<\/td>\n\u5199\u5165\u4ece\u7ebf\u7a0b\u6307\u9488\u5730\u5740\u8ba1\u7b97\u7684\u504f\u79fb\u91cf\uff0c\u5bf9\u5e94\u4e8e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7684\u7b26\u53f7\u3002\u6ce8\u610f\uff0c\u8fd9\u4ec5\u5728\u6a21\u5757\u59cb\u7ec8\u5728\u7a0b\u5e8f\u52a0\u8f7d\u671f\u95f4\u52a0\u8f7d\u800c\u975e\u901a\u8fc7 dlopen<\/code> \u52a0\u8f7d\u65f6\u6709\u6548\u3002<\/td>\n<\/tr>\n
      R_AARCH64_TLS_TPOFF<\/td>\n\u5199\u5165\u4ece\u7ebf\u7a0b\u6307\u9488\u5730\u5740\u8ba1\u7b97\u7684\u504f\u79fb\u91cf\uff0c\u5bf9\u5e94\u4e8e\u91cd\u5b9a\u4f4d\u6307\u5b9a\u7684\u7b26\u53f7\u3002\u6ce8\u610f\uff0c\u8fd9\u4ec5\u5728\u6a21\u5757\u59cb\u7ec8\u5728\u7a0b\u5e8f\u52a0\u8f7d\u671f\u95f4\u52a0\u8f7d\u800c\u975e\u901a\u8fc7 dlopen<\/code> \u52a0\u8f7d\u65f6\u6709\u6548\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
      __tls_get_addr<\/code> \u51fd\u6570\u6267\u884c\u4ee5\u4e0b\u64cd\u4f5c\uff0c\u7528\u4f2a\u4ee3\u7801\u63cf\u8ff0\u5982\u4e0b6<\/a><\/sup>\uff1a<\/p>\n
      void* __tls_get_addr(struct dl_tls_index* tlsentry)\n{\n  \/\/ \u83b7\u53d6\u7ebf\u7a0b\u6307\u9488\uff1a\n  tcbhead_t* tp = (tcbhead_t*)__builtin_thread_pointer();\n\n  \/\/ \u68c0\u67e5\u7ebf\u7a0b\u7684 DTV \u7248\u672c\uff0c\u5e76\u5728\u5fc5\u8981\u65f6\u66f4\u65b0\uff1a\n  dtv_t* dtv = tp->dtv;\n  if (dtv[0].counter != dl_tls_generation)\n    update_dtv_list();\n\n  \/\/ \u5206\u914d TLS \u6761\u76ee \n  uint8_t* tlsbase = (uint8_t*)dtv[tlsentry->ti_module].pointer.val;\n  if (tlsbase == NULL)\n    return allocate_tls_section_for_current_thread(tlsentry->ti_module);\n  return tlsbase + tlsentry->ti_module;\n}<\/code><\/pre>\n
      DTV \u7248\u672c\u68c0\u67e5\u7684\u76ee\u7684\u662f\u5904\u7406\u4e00\u79cd\u60c5\u51b5\uff1a\u4e00\u4e2a\u7ebf\u7a0b\u901a\u8fc7 dlopen<\/code> \u52a8\u6001\u6253\u5f00\u4e00\u4e2a\u5171\u4eab\u5e93\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u968f\u540e\u5c1d\u8bd5\u8bbf\u95ee\u8be5\u5171\u4eab\u5e93\u4e2d\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u3002\u8fd9\u907f\u514d\u4e86\u5728 dlopen<\/code> \u671f\u95f4\u9700\u8981\u6682\u505c\u6240\u6709\u7ebf\u7a0b\u5e76\u52a8\u6001\u8c03\u6574\u5b83\u4eec\u5404\u81ea\u7684 DTV \u6570\u7ec4\u3002\u5728 dlopen<\/code> \u548c dlclose<\/code> \u671f\u95f4\uff0c\u5168\u5c40 DTV \u7248\u672c\u4f1a\u88ab\u66f4\u65b0\u3002\u7ebf\u7a0b\u5c06\u5728\u4e0b\u4e00\u6b21\u8c03\u7528 __tls_get_addr<\/code> \u65f6\u66f4\u65b0\u81ea\u5df1\u7684 DTV \u6570\u7ec4\uff0c\u91ca\u653e\u4e0e\u73b0\u5df2\u5173\u95ed\u7684\u5171\u4eab\u5e93\u76f8\u5173\u8054\u7684\u4efb\u4f55\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff0c\u5e76\u786e\u4fdd DTV \u6570\u7ec4\u672c\u8eab\u8db3\u591f\u957f\uff0c\u4ee5\u5305\u542b\u6bcf\u4e2a\u6253\u5f00\u7684\u5171\u4eab\u5e93\u7684\u6761\u76ee\u3002<\/p>\n
      \u5ef6\u8fdf TLS \u533a\u6bb5\u5206\u914d\u7684\u76ee\u7684\u662f\u4f5c\u4e3a\u4e00\u79cd\u5c0f\u7684\u6027\u80fd\u4f18\u5316\u3002\u8fd9\u786e\u4fdd\u4e86\u7ebf\u7a0b\u4ec5\u4e3a\u5b9e\u9645\u4f7f\u7528\u8fd9\u4e9b\u53d8\u91cf\u7684\u52a8\u6001\u6253\u5f00\u7684\u5171\u4eab\u5e93\u7684\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u5206\u914d\u5185\u5b58\u3002<\/p>\n
      \u8fd9\u4e00\u8fc7\u7a0b\u7684\u603b\u4f53\u7ed3\u679c\u662f\uff0c\u7f16\u8bd1\u5668\u53d1\u51fa\u901a\u8fc7\u8c03\u7528 __tls_get_addr<\/code> \u8bbf\u95ee\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u7684\u4ee3\u7801\u3002\u52a0\u8f7d\u5668\u4f7f\u7528\u91cd\u5b9a\u4f4d\u6765\u4f20\u8fbe\u88ab\u8bbf\u95ee\u53d8\u91cf\u7684\u6a21\u5757 ID \u548c TLS \u504f\u79fb\u91cf\u3002\u6700\u540e\uff0c\u8fd0\u884c\u65f6\u7cfb\u7edf\u4f7f\u7528 __tls_get_addr<\/code> \u51fd\u6570\u672c\u8eab\u6309\u9700\u5206\u914d\u7ebf\u7a0b\u672c\u5730\u5b58\u50a8\uff0c\u5e76\u5c06\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u7684\u5730\u5740\u8fd4\u56de\u7ed9\u7a0b\u5e8f\u3002<\/p>\n
      Local-Dynamic TLS \u8bbf\u95ee\u6a21\u578b<\/h2>\n
      Local-Dynamic TLS \u8bbf\u95ee\u6a21\u578b\u7531\u9700\u8981\u8bbf\u95ee\u5176\u81ea\u8eab\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u7684\u5171\u4eab\u5e93\u4f7f\u7528\uff0c\u65e0\u8bba\u8fd9\u4e9b\u5171\u4eab\u5e93\u662f\u9759\u6001\u52a0\u8f7d\u8fd8\u662f\u52a8\u6001\u52a0\u8f7d\uff0c\u5b9e\u9645\u4e0a\u5b83\u662f Global-Dynamic TLS \u8bbf\u95ee\u6a21\u578b\u7684\u7b80\u5316\u5f62\u5f0f\u3002\u8be5\u6a21\u578b\u57fa\u4e8e\u4ee5\u4e0b\u89c2\u5bdf\uff1a\u5728\u8bbf\u95ee\u5176\u81ea\u8eab\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\u65f6\uff0c\u7a0b\u5e8f\u5df2\u7ecf\u77e5\u9053\u8fd9\u4e9b\u53d8\u91cf\u5728\u5176\u81ea\u8eab TLS \u533a\u57df\u5185\u7684\u504f\u79fb\u91cf\uff1b\u5b83\u552f\u4e00\u4e0d\u77e5\u9053\u7684\u662f\u8be5 TLS \u533a\u57df\u7684\u786e\u5207\u4f4d\u7f6e\u3002<\/p>\n
      \u9488\u5bf9\u8fd9\u79cd\u60c5\u51b5\uff0c\u7f16\u8bd1\u5668\u6709\u65f6\u53ef\u4ee5\u53d1\u51fa\u7a0d\u5feb\u7684\u6307\u4ee4\u5e8f\u5217\u3002\u5047\u8bbe\u4e00\u4e2a\u7a0b\u5e8f\u8bd5\u56fe\u8fde\u7eed\u8bbf\u95ee\u4e24\u4e2a\u7ebf\u7a0b\u5c40\u90e8\u53d8\u91cf\uff0c\u4e00\u4e2a\u504f\u79fb\u91cf\u4e3a 16\uff0c\u53e6\u4e00\u4e2a\u504f\u79fb\u91cf\u4e3a 256\u3002\u7f16\u8bd1\u5668\u4e0d\u4f1a\u53d1\u51fa\u4e24\u6b21\u8c03\u7528 __tls_get_addr<\/code>\uff0c\u800c\u662f\u53d1\u51fa\u4e00\u6b21\u5bf9\u5f53\u524d\u7ebf\u7a0b\u8c03\u7528 __tls_get_addr<\/code>\uff0c\u4f20\u9012\u5f53\u524d\u6a21\u5757 ID \u548c\u504f\u79fb\u91cf 0\uff0c\u4ee5\u83b7\u53d6\u5f53\u524d\u6a21\u5757\u81ea\u8eab\u7ebf\u7a0b\u7684 TLS \u5730\u5740\u3002\u7136\u540e\u52a0\u4e0a 16 \u5f97\u5230\u7b2c\u4e00\u4e2a\u53d8\u91cf\u7684\u5730\u5740\uff0c\u518d\u52a0\u4e0a 256 \u5f97\u5230\u7b2c\u4e8c\u4e2a\u53d8\u91cf\u7684\u5730\u5740\u3002<\/p>\n
      Notes<\/h2>\n
      \n
      \n
        \n
      1. \n
        http:\/\/www.uclibc.org\/docs\/tls.pdf<\/a> ↩<\/a><\/p>\n<\/li>\n
      2. \n
        http:\/\/www.uclibc.org\/docs\/tls.pdf<\/a> ↩<\/a><\/p>\n<\/li>\n
      3. \n
        https:\/\/developer.arm.com\/documentation\/ddi0360\/f\/control-coprocessor-cp15\/register-descriptions\/c13–thread-id-registers?lang=en<\/a> ↩<\/a><\/p>\n<\/li>\n
      4. \n
        https:\/\/gcc.gnu.org\/onlinedocs\/gcc\/Common-Variable-Attributes.xhtml<\/a> ↩<\/a><\/p>\n<\/li>\n
      5. \n
        https:\/\/code.woboq.org\/userspace\/glibc\/sysdeps\/arm\/dl-tls.h.xhtml<\/a> ↩<\/a><\/p>\n<\/li>\n
      6. \n
        https:\/\/code.woboq.org\/userspace\/glibc\/elf\/dl-tls.c.xhtml#824<\/a> ↩<\/a><\/p>\n<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
        \u539f\u6587\uff1a\u300aBlue Fox: Arm Assembly Internals & Reverse Engi […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[101],"series":[],"class_list":["post-7723","post","type-post","status-publish","format-standard","hentry","category-study-notes","tag-101"],"_links":{"self":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7723","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/comments?post=7723"}],"version-history":[{"count":9,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7723\/revisions"}],"predecessor-version":[{"id":7737,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/posts\/7723\/revisions\/7737"}],"wp:attachment":[{"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/media?parent=7723"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/categories?post=7723"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/tags?post=7723"},{"taxonomy":"series","embeddable":true,"href":"https:\/\/www.wangonc.com\/index.php\/wp-json\/wp\/v2\/series?post=7723"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}