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1 //===-- sanitizer_tls_get_addr.h --------------------------------*- C++ -*-===//
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2 //
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3 // This file is distributed under the University of Illinois Open Source
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4 // License. See LICENSE.TXT for details.
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5 //
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6 //===----------------------------------------------------------------------===//
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7 //
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8 // Handle the __tls_get_addr call.
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9 //
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10 // All this magic is specific to glibc and is required to workaround
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11 // the lack of interface that would tell us about the Dynamic TLS (DTLS).
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12 // https://sourceware.org/bugzilla/show_bug.cgi?id=16291
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13 //
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14 // The matters get worse because the glibc implementation changed between
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15 // 2.18 and 2.19:
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16 // https://groups.google.com/forum/#!topic/address-sanitizer/BfwYD8HMxTM
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17 //
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18 // Before 2.19, every DTLS chunk is allocated with __libc_memalign,
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19 // which we intercept and thus know where is the DTLS.
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20 // Since 2.19, DTLS chunks are allocated with __signal_safe_memalign,
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21 // which is an internal function that wraps a mmap call, neither of which
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22 // we can intercept. Luckily, __signal_safe_memalign has a simple parseable
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23 // header which we can use.
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24 //
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25 //===----------------------------------------------------------------------===//
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26
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27 #ifndef SANITIZER_TLS_GET_ADDR_H
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28 #define SANITIZER_TLS_GET_ADDR_H
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29
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30 #include "sanitizer_common.h"
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31
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32 namespace __sanitizer {
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33
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34 struct DTLS {
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35 // Array of DTLS chunks for the current Thread.
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36 // If beg == 0, the chunk is unused.
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37 struct DTV {
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38 uptr beg, size;
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39 };
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40
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41 uptr dtv_size;
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42 DTV *dtv; // dtv_size elements, allocated by MmapOrDie.
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43
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44 // Auxiliary fields, don't access them outside sanitizer_tls_get_addr.cc
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45 uptr last_memalign_size;
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46 uptr last_memalign_ptr;
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47 };
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48
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49 // Returns pointer and size of a linker-allocated TLS block.
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50 // Each block is returned exactly once.
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51 DTLS::DTV *DTLS_on_tls_get_addr(void *arg, void *res, uptr static_tls_begin,
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52 uptr static_tls_end);
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53 void DTLS_on_libc_memalign(void *ptr, uptr size);
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54 DTLS *DTLS_Get();
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55 void DTLS_Destroy(); // Make sure to call this before the thread is destroyed.
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56 // Returns true if DTLS of suspended thread is in destruction process.
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57 bool DTLSInDestruction(DTLS *dtls);
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58
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59 } // namespace __sanitizer
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60
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61 #endif // SANITIZER_TLS_GET_ADDR_H
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