[PATCH] D103936: [compiler-rt][hwasan] Define fuchsia implementations of required hwasan functions

[Leonard Chan via Phabricator via cfe-commits]

leonardchan updated this revision to Diff 352194.
leonardchan added a comment.

Rebase and remove `__hwasan_shadow_memory_dynamic_address`. We don't need to set it anymore.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D103936/new/

https://reviews.llvm.org/D103936

Files:
  compiler-rt/lib/hwasan/CMakeLists.txt
  compiler-rt/lib/hwasan/hwasan_fuchsia.cpp


Index: compiler-rt/lib/hwasan/hwasan_fuchsia.cpp
===================================================================
--- /dev/null
+++ compiler-rt/lib/hwasan/hwasan_fuchsia.cpp
@@ -0,0 +1,63 @@
+//===-- 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"
+
+namespace __hwasan {
+
+bool InitShadow() {
+  // Call this explicitly to set the ShadowBounds global so we can reference it
+  // now. Otherwise, ShadowBounds will be a zero-initialized global.
+  ShadowBounds = __sanitizer_shadow_bounds();
+  CHECK_NE(__sanitizer::ShadowBounds.shadow_limit, 0);
+
+  return true;
+}
+
+bool MemIsApp(uptr p) {
+  CHECK(GetTagFromPointer(p) == 0);
+  return __sanitizer::ShadowBounds.shadow_limit <= p &&
+         p <= __sanitizer::GetMaxUserVirtualAddress();
+}
+
+// Not implemented because Fuchsia does not use signal handlers.
+void HwasanOnDeadlySignal(int signo, void *info, void *context) {}
+
+// Not implemented because Fuchsia does not use interceptors.
+void InitializeInterceptors() {}
+
+// Not implemented because this is only relevant for Android.
+void AndroidTestTlsSlot() {}
+
+// TSD was normally used on linux as a means of calling the hwasan thread exit
+// handler passed to pthread_key_create. This is not needed on Fuchsia because
+// we will be using __sanitizer_thread_exit_hook.
+void HwasanTSDInit() {}
+void HwasanTSDThreadInit() {}
+
+// On linux, this just would call `atexit(HwasanAtExit)`. The functions in
+// HwasanAtExit are unimplemented for Fuchsia and effectively no-ops, so this
+// function is unneeded.
+void InstallAtExitHandler() {}
+
+}  // namespace __hwasan
+
+#endif  // SANITIZER_FUCHSIA
Index: compiler-rt/lib/hwasan/CMakeLists.txt
===================================================================
--- compiler-rt/lib/hwasan/CMakeLists.txt
+++ 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


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