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diff --git a/lib/asan/asan_rtems.cpp b/lib/asan/asan_rtems.cpp
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+//===-- asan_rtems.cpp ----------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of AddressSanitizer, an address sanity checker.
+//
+// RTEMS-specific details.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_rtems.h"
+#if SANITIZER_RTEMS
+
+#include "asan_internal.h"
+#include "asan_interceptors.h"
+#include "asan_mapping.h"
+#include "asan_poisoning.h"
+#include "asan_report.h"
+#include "asan_stack.h"
+#include "sanitizer_common/sanitizer_common.h"
+#include "sanitizer_common/sanitizer_libc.h"
+
+#include <pthread.h>
+#include <stdlib.h>
+
+namespace __asan {
+
+static void ResetShadowMemory() {
+ uptr shadow_start = SHADOW_OFFSET;
+ uptr shadow_end = MEM_TO_SHADOW(kMyriadMemoryEnd32);
+ uptr gap_start = MEM_TO_SHADOW(shadow_start);
+ uptr gap_end = MEM_TO_SHADOW(shadow_end);
+
+ REAL(memset)((void *)shadow_start, 0, shadow_end - shadow_start);
+ REAL(memset)((void *)gap_start, kAsanShadowGap, gap_end - gap_start);
+}
+
+void InitializeShadowMemory() {
+ kHighMemEnd = 0;
+ kMidMemBeg = 0;
+ kMidMemEnd = 0;
+
+ ResetShadowMemory();
+}
+
+void AsanApplyToGlobals(globals_op_fptr op, const void *needle) {
+ UNIMPLEMENTED();
+}
+
+void AsanCheckDynamicRTPrereqs() {}
+void AsanCheckIncompatibleRT() {}
+void InitializeAsanInterceptors() {}
+void InitializePlatformInterceptors() {}
+void InitializePlatformExceptionHandlers() {}
+
+// RTEMS only support static linking; it sufficies to return with no
+// error.
+void *AsanDoesNotSupportStaticLinkage() { return nullptr; }
+
+void AsanOnDeadlySignal(int signo, void *siginfo, void *context) {
+ UNIMPLEMENTED();
+}
+
+void EarlyInit() {
+ // Provide early initialization of shadow memory so that
+ // instrumented code running before full initialzation will not
+ // report spurious errors.
+ ResetShadowMemory();
+}
+
+// We can use a plain thread_local variable for TSD.
+static thread_local void *per_thread;
+
+void *AsanTSDGet() { return per_thread; }
+
+void AsanTSDSet(void *tsd) { per_thread = tsd; }
+
+// There's no initialization needed, and the passed-in destructor
+// will never be called. Instead, our own thread destruction hook
+// (below) will call AsanThread::TSDDtor directly.
+void AsanTSDInit(void (*destructor)(void *tsd)) {
+ DCHECK(destructor == &PlatformTSDDtor);
+}
+
+void PlatformTSDDtor(void *tsd) { UNREACHABLE(__func__); }
+
+//
+// Thread registration. We provide an API similar to the Fushia port.
+//
+
+struct AsanThread::InitOptions {
+ uptr stack_bottom, stack_size, tls_bottom, tls_size;
+};
+
+// Shared setup between thread creation and startup for the initial thread.
+static AsanThread *CreateAsanThread(StackTrace *stack, u32 parent_tid,
+ uptr user_id, bool detached,
+ uptr stack_bottom, uptr stack_size,
+ uptr tls_bottom, uptr tls_size) {
+ // In lieu of AsanThread::Create.
+ AsanThread *thread = (AsanThread *)MmapOrDie(sizeof(AsanThread), __func__);
+ AsanThreadContext::CreateThreadContextArgs args = {thread, stack};
+ asanThreadRegistry().CreateThread(user_id, detached, parent_tid, &args);
+
+ // On other systems, AsanThread::Init() is called from the new
+ // thread itself. But on RTEMS we already know the stack address
+ // range beforehand, so we can do most of the setup right now.
+ const AsanThread::InitOptions options = {stack_bottom, stack_size,
+ tls_bottom, tls_size};
+ thread->Init(&options);
+ return thread;
+}
+
+// This gets the same arguments passed to Init by CreateAsanThread, above.
+// We're in the creator thread before the new thread is actually started, but
+// its stack and tls address range are already known.
+void AsanThread::SetThreadStackAndTls(const AsanThread::InitOptions *options) {
+ DCHECK_NE(GetCurrentThread(), this);
+ DCHECK_NE(GetCurrentThread(), nullptr);
+ CHECK_NE(options->stack_bottom, 0);
+ CHECK_NE(options->stack_size, 0);
+ stack_bottom_ = options->stack_bottom;
+ stack_top_ = options->stack_bottom + options->stack_size;
+ tls_begin_ = options->tls_bottom;
+ tls_end_ = options->tls_bottom + options->tls_size;
+}
+
+// Called by __asan::AsanInitInternal (asan_rtl.c). Unlike other ports, the
+// main thread on RTEMS does not require special treatment; its AsanThread is
+// already created by the provided hooks. This function simply looks up and
+// returns the created thread.
+AsanThread *CreateMainThread() {
+ return GetThreadContextByTidLocked(0)->thread;
+}
+
+// This is called before each thread creation is attempted. So, in
+// its first call, the calling thread is the initial and sole thread.
+static void *BeforeThreadCreateHook(uptr user_id, bool detached,
+ uptr stack_bottom, uptr stack_size,
+ uptr tls_bottom, uptr tls_size) {
+ EnsureMainThreadIDIsCorrect();
+ // Strict init-order checking is thread-hostile.
+ if (flags()->strict_init_order) StopInitOrderChecking();
+
+ GET_STACK_TRACE_THREAD;
+ u32 parent_tid = GetCurrentTidOrInvalid();
+
+ return CreateAsanThread(&stack, parent_tid, user_id, detached,
+ stack_bottom, stack_size, tls_bottom, tls_size);
+}
+
+// This is called after creating a new thread (in the creating thread),
+// with the pointer returned by BeforeThreadCreateHook (above).
+static void ThreadCreateHook(void *hook, bool aborted) {
+ AsanThread *thread = static_cast<AsanThread *>(hook);
+ if (!aborted) {
+ // The thread was created successfully.
+ // ThreadStartHook is already running in the new thread.
+ } else {
+ // The thread wasn't created after all.
+ // Clean up everything we set up in BeforeThreadCreateHook.
+ asanThreadRegistry().FinishThread(thread->tid());
+ UnmapOrDie(thread, sizeof(AsanThread));
+ }
+}
+
+// This is called (1) in the newly-created thread before it runs anything else,
+// with the pointer returned by BeforeThreadCreateHook (above). (2) before a
+// thread restart.
+static void ThreadStartHook(void *hook, uptr os_id) {
+ if (!hook)
+ return;
+
+ AsanThread *thread = static_cast<AsanThread *>(hook);
+ SetCurrentThread(thread);
+
+ ThreadStatus status =
+ asanThreadRegistry().GetThreadLocked(thread->tid())->status;
+ DCHECK(status == ThreadStatusCreated || status == ThreadStatusRunning);
+ // Determine whether we are starting or restarting the thread.
+ if (status == ThreadStatusCreated) {
+ // In lieu of AsanThread::ThreadStart.
+ asanThreadRegistry().StartThread(thread->tid(), os_id, ThreadType::Regular,
+ nullptr);
+ } else {
+ // In a thread restart, a thread may resume execution at an
+ // arbitrary function entry point, with its stack and TLS state
+ // reset. We unpoison the stack in that case.
+ PoisonShadow(thread->stack_bottom(), thread->stack_size(), 0);
+ }
+}
+
+// Each thread runs this just before it exits,
+// with the pointer returned by BeforeThreadCreateHook (above).
+// All per-thread destructors have already been called.
+static void ThreadExitHook(void *hook, uptr os_id) {
+ AsanThread *thread = static_cast<AsanThread *>(hook);
+ if (thread)
+ AsanThread::TSDDtor(thread->context());
+}
+
+static void HandleExit() {
+ // Disable ASan by setting it to uninitialized. Also reset the
+ // shadow memory to avoid reporting errors after the run-time has
+ // been desroyed.
+ if (asan_inited) {
+ asan_inited = false;
+ ResetShadowMemory();
+ }
+}
+
+bool HandleDlopenInit() {
+ // Not supported on this platform.
+ static_assert(!SANITIZER_SUPPORTS_INIT_FOR_DLOPEN,
+ "Expected SANITIZER_SUPPORTS_INIT_FOR_DLOPEN to be false");
+ return false;
+}
+} // namespace __asan
+
+// These are declared (in extern "C") by <some_path/sanitizer.h>.
+// The system runtime will call our definitions directly.
+
+extern "C" {
+void __sanitizer_early_init() {
+ __asan::EarlyInit();
+}
+
+void *__sanitizer_before_thread_create_hook(uptr thread, bool detached,
+ const char *name,
+ void *stack_base, size_t stack_size,
+ void *tls_base, size_t tls_size) {
+ return __asan::BeforeThreadCreateHook(
+ thread, detached,
+ reinterpret_cast<uptr>(stack_base), stack_size,
+ reinterpret_cast<uptr>(tls_base), tls_size);
+}
+
+void __sanitizer_thread_create_hook(void *handle, uptr thread, int status) {
+ __asan::ThreadCreateHook(handle, status != 0);
+}
+
+void __sanitizer_thread_start_hook(void *handle, uptr self) {
+ __asan::ThreadStartHook(handle, self);
+}
+
+void __sanitizer_thread_exit_hook(void *handle, uptr self) {
+ __asan::ThreadExitHook(handle, self);
+}
+
+void __sanitizer_exit() {
+ __asan::HandleExit();
+}
+} // "C"
+
+#endif // SANITIZER_RTEMS