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+// -*- mode: C++ -*-
+
+// Copyright (c) 2013 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// stackwalker_arm64.h: arm64-specific stackwalker.
+//
+// Provides stack frames given arm64 register context and a memory region
+// corresponding to an arm64 stack.
+//
+// Author: Mark Mentovai, Ted Mielczarek, Colin Blundell
+
+
+#ifndef PROCESSOR_STACKWALKER_ARM64_H__
+#define PROCESSOR_STACKWALKER_ARM64_H__
+
+#include "google_breakpad/common/breakpad_types.h"
+#include "google_breakpad/common/minidump_format.h"
+#include "google_breakpad/processor/stackwalker.h"
+
+namespace google_breakpad {
+
+class CodeModules;
+
+class StackwalkerARM64 : public Stackwalker {
+ public:
+  // context is an arm64 context object that gives access to arm64-specific
+  // register state corresponding to the innermost called frame to be
+  // included in the stack.  The other arguments are passed directly through
+  // to the base Stackwalker constructor.
+  StackwalkerARM64(const SystemInfo* system_info,
+                   const MDRawContextARM64* context,
+                   MemoryRegion* memory,
+                   const CodeModules* modules,
+                   StackFrameSymbolizer* frame_symbolizer);
+
+  // Change the context validity mask of the frame returned by
+  // GetContextFrame to VALID. This is only for use by unit tests; the
+  // default behavior is correct for all application code.
+  void SetContextFrameValidity(uint64_t valid) {
+    context_frame_validity_ = valid;
+  }
+
+ private:
+  // Strip pointer authentication codes from an address.
+  uint64_t PtrauthStrip(uint64_t ptr);
+
+  // Implementation of Stackwalker, using arm64 context and stack conventions.
+  virtual StackFrame* GetContextFrame();
+  virtual StackFrame* GetCallerFrame(const CallStack* stack,
+                                     bool stack_scan_allowed);
+
+  // Use cfi_frame_info (derived from STACK CFI records) to construct
+  // the frame that called frames.back(). The caller takes ownership
+  // of the returned frame. Return NULL on failure.
+  StackFrameARM64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
+                                           CFIFrameInfo* cfi_frame_info);
+
+  // Use the frame pointer. The caller takes ownership of the returned frame.
+  // Return NULL on failure.
+  StackFrameARM64* GetCallerByFramePointer(const vector<StackFrame*> &frames);
+
+  // Scan the stack for plausible return addresses. The caller takes ownership
+  // of the returned frame. Return NULL on failure.
+  StackFrameARM64* GetCallerByStackScan(const vector<StackFrame*> &frames);
+
+  // GetCallerByFramePointer() depends on the previous frame having recovered
+  // x30($LR) which may not have been done when using CFI.
+  // This function recovers $LR in the previous frame by using the frame-pointer
+  // two frames back to read it from the stack.
+  void CorrectRegLRByFramePointer(const vector<StackFrame*>& frames,
+                                  StackFrameARM64* last_frame);
+
+  // Return true if the instruction pointer points into the first 4KiB of memory
+  bool ValidInstructionPointerInFrame(const StackFrameARM64& frame);
+
+  // Stores the CPU context corresponding to the youngest stack frame, to
+  // be returned by GetContextFrame.
+  const MDRawContextARM64* context_;
+
+  // Validity mask for youngest stack frame. This is always
+  // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of
+  // unit tests.
+  uint64_t context_frame_validity_;
+
+  // A mask of the valid address bits, determined from the address range of
+  // modules_.
+  uint64_t address_range_mask_;
+};
+
+
+}  // namespace google_breakpad
+
+
+#endif  // PROCESSOR_STACKWALKER_ARM64_H__