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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__
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