blob: 328376b8a92c6ccbe6f3ca866e2d89f709d49129 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#if defined(DART_HOST_OS_ANDROID)
#include <errno.h> // NOLINT
#include <sys/syscall.h> // NOLINT
#include "vm/flags.h"
#include "vm/os.h"
#include "vm/profiler.h"
#include "vm/signal_handler.h"
#include "vm/thread_interrupter.h"
namespace dart {
#ifndef PRODUCT
// Old linux kernels on ARM might require a trampoline to
// work around incorrect Thumb -> ARM transitions.
// See thread_interrupted_android_arm.S for more details.
#if defined(HOST_ARCH_ARM) && \
(defined(DART_HOST_OS_LINUX) || defined(DART_HOST_OS_ANDROID)) && \
!defined(__thumb__)
#define USE_SIGNAL_HANDLER_TRAMPOLINE
#endif
DECLARE_FLAG(bool, trace_thread_interrupter);
namespace {
#if defined(USE_SIGNAL_HANDLER_TRAMPOLINE)
extern "C" {
#endif
void ThreadInterruptSignalHandler(int signal, siginfo_t* info, void* context_) {
if (signal != SIGPROF) {
return;
}
Thread* thread = Thread::Current();
if (thread == nullptr) {
return;
}
ThreadInterruptScope signal_handler_scope;
// Extract thread state.
ucontext_t* context = reinterpret_cast<ucontext_t*>(context_);
mcontext_t mcontext = context->uc_mcontext;
InterruptedThreadState its;
its.pc = SignalHandler::GetProgramCounter(mcontext);
its.fp = SignalHandler::GetFramePointer(mcontext);
its.csp = SignalHandler::GetCStackPointer(mcontext);
its.dsp = SignalHandler::GetDartStackPointer(mcontext);
its.lr = SignalHandler::GetLinkRegister(mcontext);
Profiler::SampleThread(thread, its);
}
#if defined(USE_SIGNAL_HANDLER_TRAMPOLINE)
} // extern "C"
#endif
} // namespace
void ThreadInterrupter::InterruptThread(OSThread* thread) {
if (FLAG_trace_thread_interrupter) {
OS::PrintErr("ThreadInterrupter interrupting %p\n",
reinterpret_cast<void*>(thread->id()));
}
int result = syscall(__NR_tgkill, getpid(), thread->id(), SIGPROF);
ASSERT((result == 0) || (result == ESRCH));
}
#if defined(USE_SIGNAL_HANDLER_TRAMPOLINE)
// Defined in thread_interrupted_android_arm.S
extern "C" void ThreadInterruptSignalHandlerTrampoline(int signal,
siginfo_t* info,
void* context_);
#endif
void ThreadInterrupter::InstallSignalHandler() {
#if defined(USE_SIGNAL_HANDLER_TRAMPOLINE)
SignalHandler::Install(&ThreadInterruptSignalHandlerTrampoline);
#else
SignalHandler::Install(&ThreadInterruptSignalHandler);
#endif
}
void ThreadInterrupter::RemoveSignalHandler() {
SignalHandler::Remove();
}
void* ThreadInterrupter::PrepareCurrentThread() {
return SignalHandler::PrepareCurrentThread();
}
void ThreadInterrupter::CleanupCurrentThreadState(void* state) {
SignalHandler::CleanupCurrentThreadState(state);
}
#endif // !PRODUCT
} // namespace dart
#endif // defined(DART_HOST_OS_ANDROID)