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f2b3ab5e0a
For a crash at the function entry with corrupted PC, the caller's PC could be lying in the link register. Using the PC from link register would be more effective than blindly scanning the stack immediately. Change-Id: I51673b7298e70faeeab2bfa97075e3c4793f94bc Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/2678992 Reviewed-by: Mike Frysinger <vapier@chromium.org> Reviewed-by: Joshua Peraza <jperaza@chromium.org>
112 lines
4.6 KiB
C++
112 lines
4.6 KiB
C++
// -*- mode: C++ -*-
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// Copyright (c) 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// stackwalker_arm.h: arm-specific stackwalker.
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//
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// Provides stack frames given arm register context and a memory region
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// corresponding to an arm stack.
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//
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// Author: Mark Mentovai, Ted Mielczarek
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#ifndef PROCESSOR_STACKWALKER_ARM_H__
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#define PROCESSOR_STACKWALKER_ARM_H__
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#include "google_breakpad/common/breakpad_types.h"
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#include "google_breakpad/common/minidump_format.h"
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#include "google_breakpad/processor/stackwalker.h"
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namespace google_breakpad {
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class CodeModules;
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class StackwalkerARM : public Stackwalker {
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public:
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// context is an arm context object that gives access to arm-specific
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// register state corresponding to the innermost called frame to be
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// included in the stack. The other arguments are passed directly through
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// to the base Stackwalker constructor.
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StackwalkerARM(const SystemInfo* system_info,
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const MDRawContextARM* context,
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int fp_register,
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MemoryRegion* memory,
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const CodeModules* modules,
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StackFrameSymbolizer* frame_symbolizer);
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// Change the context validity mask of the frame returned by
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// GetContextFrame to VALID. This is only for use by unit tests; the
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// default behavior is correct for all application code.
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void SetContextFrameValidity(int valid) { context_frame_validity_ = valid; }
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private:
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// Implementation of Stackwalker, using arm context and stack conventions.
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virtual StackFrame* GetContextFrame();
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virtual StackFrame* GetCallerFrame(const CallStack* stack,
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bool stack_scan_allowed);
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// Use cfi_frame_info (derived from STACK CFI records) to construct
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// the frame that called frames.back(). The caller takes ownership
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// of the returned frame. Return NULL on failure.
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StackFrameARM* GetCallerByCFIFrameInfo(const vector<StackFrame*>& frames,
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CFIFrameInfo* cfi_frame_info);
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// Use the frame pointer. The caller takes ownership of the returned frame.
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// Return NULL on failure.
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StackFrameARM* GetCallerByFramePointer(const vector<StackFrame*>& frames);
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// Use the link register if it seems to be a valid function adderss.
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// The caller takes ownership of the returned frame. Return NULL on failure.
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// This is useful when PC register is corrupted.
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StackFrameARM* GetCallerByLinkRegister(const vector<StackFrame*>& frames);
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// Scan the stack for plausible return addresses. The caller takes ownership
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// of the returned frame. Return NULL on failure.
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StackFrameARM* GetCallerByStackScan(const vector<StackFrame*>& frames);
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// Stores the CPU context corresponding to the youngest stack frame, to
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// be returned by GetContextFrame.
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const MDRawContextARM* context_;
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// The register to use a as frame pointer. The value is -1 if frame pointer
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// cannot be used.
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int fp_register_;
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// Validity mask for youngest stack frame. This is always
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// CONTEXT_VALID_ALL in real use; it is only changeable for the sake of
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// unit tests.
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int context_frame_validity_;
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};
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} // namespace google_breakpad
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#endif // PROCESSOR_STACKWALKER_ARM_H__
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