diff --git a/compiler-rt/lib/hwasan/CMakeLists.txt b/compiler-rt/lib/hwasan/CMakeLists.txt
--- a/compiler-rt/lib/hwasan/CMakeLists.txt
+++ b/compiler-rt/lib/hwasan/CMakeLists.txt
@@ -7,6 +7,7 @@
   hwasan_allocation_functions.cpp
   hwasan_dynamic_shadow.cpp
   hwasan_exceptions.cpp
+  hwasan_fuchsia.cpp
   hwasan_globals.cpp
   hwasan_interceptors.cpp
   hwasan_interceptors_vfork.S
diff --git a/compiler-rt/lib/hwasan/hwasan_fuchsia.cpp b/compiler-rt/lib/hwasan/hwasan_fuchsia.cpp
new file mode 100644
--- /dev/null
+++ b/compiler-rt/lib/hwasan/hwasan_fuchsia.cpp
@@ -0,0 +1,108 @@
+//===-- hwasan_fuchsia.cpp --------------------------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file is a part of HWAddressSanitizer and contains Fuchsia-specific
+/// code.
+///
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_fuchsia.h"
+#if SANITIZER_FUCHSIA
+
+#include "hwasan.h"
+#include "hwasan_interface_internal.h"
+#include "hwasan_report.h"
+#include "hwasan_thread.h"
+#include "hwasan_thread_list.h"
+
+SANITIZER_INTERFACE_ATTRIBUTE
+THREADLOCAL uptr __hwasan_tls;
+
+namespace __hwasan {
+
+uptr kHighMemEnd;
+uptr kHighMemBeg;
+uptr kAliasRegionStart = 0;  // Always 0 on non-x86.
+
+bool InitShadow() {
+  __hwasan_shadow_memory_dynamic_address = 0;
+
+  // This initializes __sanitizer::ShadowBounds.
+  kHighMemEnd = GetMaxUserVirtualAddress();
+  kHighMemBeg = __sanitizer::ShadowBounds.shadow_limit;
+
+  CHECK_EQ(kHighMemEnd, __sanitizer::ShadowBounds.memory_limit - 1);
+  CHECK_EQ(kHighMemBeg, __sanitizer::ShadowBounds.shadow_limit);
+  CHECK_NE(kHighMemBeg, 0);
+
+  return true;
+}
+
+void InitThreads() {
+  uptr alloc_size = UINT64_C(1) << kShadowBaseAlignment;
+  uptr thread_start = reinterpret_cast<uptr>(
+      MmapAlignedOrDieOnFatalError(alloc_size, alloc_size, __func__));
+  InitThreadList(thread_start, alloc_size);
+}
+
+bool MemIsApp(uptr p) {
+  CHECK(GetTagFromPointer(p) == 0);
+  return kHighMemBeg <= p && p <= kHighMemEnd;
+}
+
+// ---------------------- TSD ---------------- {{{
+
+extern "C" {
+void __sanitizer_thread_start_hook(void *hook, thrd_t self) {
+  hwasanThreadList().CreateCurrentThread()->InitRandomState();
+}
+
+void __sanitizer_thread_exit_hook(void *hook, thrd_t self) {
+  Thread *t = GetCurrentThread();
+  // Make sure that signal handler can not see a stale current thread pointer.
+  atomic_signal_fence(memory_order_seq_cst);
+  if (t)
+    hwasanThreadList().ReleaseThread(t);
+}
+
+void __sanitizer_exit() { __hwasan::HwasanAtExit(); }
+}  // extern "C"
+
+uptr *GetCurrentThreadLongPtr() { return &__hwasan_tls; }
+
+Thread *GetCurrentThread() {
+  uptr *ThreadLongPtr = GetCurrentThreadLongPtr();
+  if (UNLIKELY(*ThreadLongPtr == 0))
+    return nullptr;
+  auto *R = (StackAllocationsRingBuffer *)ThreadLongPtr;
+  return hwasanThreadList().GetThreadByBufferAddress((uptr)R->Next());
+}
+
+// Entry point stub for interoperability between __hwasan_tag_mismatch (ASM) and
+// the rest of the mismatch handling code (C++).
+extern "C" void __hwasan_tag_mismatch4(uptr addr, uptr access_info,
+                                       uptr *registers_frame, size_t outsize) {
+  __hwasan::HwasanTagMismatch(addr, access_info, registers_frame, outsize);
+}
+
+// These are defined because they are called from __hwasan_init, but empty
+// because they are not needed.
+void HwasanOnDeadlySignal(int signo, void *info, void *context) {}
+void InitializeInterceptors() {}
+void AndroidTestTlsSlot() {}
+void HwasanTSDInit() {}
+void HwasanTSDThreadInit() {}
+// TODO: On linux, this was used to check that TBI is enabled. Once we work this
+// out on Fuchsia, we should come back here and do an equivalent check.
+void InitPrctl() {}
+void InstallAtExitHandler() {}
+
+}  // namespace __hwasan
+
+#endif  // SANITIZER_FUCHSIA