libsanitizer/lsan/lsan_posix.cpp

   1 //=-- lsan_posix.cpp -----------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===---------------------------------------------------------------------===//
   8 //
   9 // This file is a part of LeakSanitizer.
  10 // Standalone LSan RTL code common to POSIX-like systems.
  11 //
  12 //===---------------------------------------------------------------------===//
  13
  14 #include "sanitizer_common/sanitizer_platform.h"
  15
  16 #if SANITIZER_POSIX
  17 #include "lsan.h"
  18 #include "lsan_allocator.h"
  19 #include "lsan_thread.h"
  20 #include "sanitizer_common/sanitizer_stacktrace.h"
  21 #include "sanitizer_common/sanitizer_tls_get_addr.h"
  22
  23 namespace __lsan {
  24
  25 ThreadContext::ThreadContext(int tid) : ThreadContextLsanBase(tid) {}
  26
  27 struct OnStartedArgs {
  28   uptr stack_begin;
  29   uptr stack_end;
  30   uptr cache_begin;
  31   uptr cache_end;
  32   uptr tls_begin;
  33   uptr tls_end;
  34   DTLS *dtls;
  35 };
  36
  37 void ThreadContext::OnStarted(void *arg) {
  38   ThreadContextLsanBase::OnStarted(arg);
  39   auto args = reinterpret_cast<const OnStartedArgs *>(arg);
  40   stack_begin_ = args->stack_begin;
  41   stack_end_ = args->stack_end;
  42   tls_begin_ = args->tls_begin;
  43   tls_end_ = args->tls_end;
  44   cache_begin_ = args->cache_begin;
  45   cache_end_ = args->cache_end;
  46   dtls_ = args->dtls;
  47 }
  48
  49 void ThreadStart(u32 tid, tid_t os_id, ThreadType thread_type) {
  50   OnStartedArgs args;
  51   uptr stack_size = 0;
  52   uptr tls_size = 0;
  53   GetThreadStackAndTls(tid == kMainTid, &args.stack_begin, &stack_size,
  54                        &args.tls_begin, &tls_size);
  55   args.stack_end = args.stack_begin + stack_size;
  56   args.tls_end = args.tls_begin + tls_size;
  57   GetAllocatorCacheRange(&args.cache_begin, &args.cache_end);
  58   args.dtls = DTLS_Get();
  59   ThreadContextLsanBase::ThreadStart(tid, os_id, thread_type, &args);
  60 }
  61
  62 bool GetThreadRangesLocked(tid_t os_id, uptr *stack_begin, uptr *stack_end,
  63                            uptr *tls_begin, uptr *tls_end, uptr *cache_begin,
  64                            uptr *cache_end, DTLS **dtls) {
  65   ThreadContext *context = static_cast<ThreadContext *>(
  66       GetLsanThreadRegistryLocked()->FindThreadContextByOsIDLocked(os_id));
  67   if (!context)
  68     return false;
  69   *stack_begin = context->stack_begin();
  70   *stack_end = context->stack_end();
  71   *tls_begin = context->tls_begin();
  72   *tls_end = context->tls_end();
  73   *cache_begin = context->cache_begin();
  74   *cache_end = context->cache_end();
  75   *dtls = context->dtls();
  76   return true;
  77 }
  78
  79 void InitializeMainThread() {
  80   u32 tid = ThreadCreate(kMainTid, true);
  81   CHECK_EQ(tid, kMainTid);
  82   ThreadStart(tid, GetTid());
  83 }
  84
  85 static void OnStackUnwind(const SignalContext &sig, const void *,
  86                           BufferedStackTrace *stack) {
  87   stack->Unwind(StackTrace::GetNextInstructionPc(sig.pc), sig.bp, sig.context,
  88                 common_flags()->fast_unwind_on_fatal);
  89 }
  90
  91 void LsanOnDeadlySignal(int signo, void *siginfo, void *context) {
  92   HandleDeadlySignal(siginfo, context, GetCurrentThreadId(), &OnStackUnwind,
  93                      nullptr);
  94 }
  95
  96 void InstallAtExitCheckLeaks() {
  97   if (common_flags()->detect_leaks && common_flags()->leak_check_at_exit)
  98     Atexit(DoLeakCheck);
  99 }
 100
 101 }  // namespace __lsan
 102
 103 #endif  // SANITIZER_POSIX