michael@0: // -*- mode: C++ -*-
michael@0: 
michael@0: // Copyright (c) 2010 Google Inc.
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michael@0: // modification, are permitted provided that the following conditions are
michael@0: // met:
michael@0: //
michael@0: //     * Redistributions of source code must retain the above copyright
michael@0: // notice, this list of conditions and the following disclaimer.
michael@0: //     * Redistributions in binary form must reproduce the above
michael@0: // copyright notice, this list of conditions and the following disclaimer
michael@0: // in the documentation and/or other materials provided with the
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michael@0: //     * Neither the name of Google Inc. nor the names of its
michael@0: // contributors may be used to endorse or promote products derived from
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michael@0: //
michael@0: // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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michael@0: 
michael@0: // stackwalker_arm.h: arm-specific stackwalker.
michael@0: //
michael@0: // Provides stack frames given arm register context and a memory region
michael@0: // corresponding to an arm stack.
michael@0: //
michael@0: // Author: Mark Mentovai, Ted Mielczarek
michael@0: 
michael@0: 
michael@0: #ifndef PROCESSOR_STACKWALKER_ARM_H__
michael@0: #define PROCESSOR_STACKWALKER_ARM_H__
michael@0: 
michael@0: #include "google_breakpad/common/breakpad_types.h"
michael@0: #include "google_breakpad/common/minidump_format.h"
michael@0: #include "google_breakpad/processor/stackwalker.h"
michael@0: 
michael@0: namespace google_breakpad {
michael@0: 
michael@0: class CodeModules;
michael@0: 
michael@0: class StackwalkerARM : public Stackwalker {
michael@0:  public:
michael@0:   // context is an arm context object that gives access to arm-specific
michael@0:   // register state corresponding to the innermost called frame to be
michael@0:   // included in the stack.  The other arguments are passed directly through
michael@0:   // to the base Stackwalker constructor.
michael@0:   StackwalkerARM(const SystemInfo* system_info,
michael@0:                  const MDRawContextARM* context,
michael@0:                  int fp_register,
michael@0:                  MemoryRegion* memory,
michael@0:                  const CodeModules* modules,
michael@0:                  StackFrameSymbolizer* frame_symbolizer);
michael@0: 
michael@0:   // Change the context validity mask of the frame returned by
michael@0:   // GetContextFrame to VALID. This is only for use by unit tests; the
michael@0:   // default behavior is correct for all application code.
michael@0:   void SetContextFrameValidity(int valid) { context_frame_validity_ = valid; }
michael@0: 
michael@0:  private:
michael@0:   // Implementation of Stackwalker, using arm context and stack conventions.
michael@0:   virtual StackFrame* GetContextFrame();
michael@0:   virtual StackFrame* GetCallerFrame(const CallStack* stack,
michael@0:                                      bool stack_scan_allowed);
michael@0: 
michael@0:   // Use cfi_frame_info (derived from STACK CFI records) to construct
michael@0:   // the frame that called frames.back(). The caller takes ownership
michael@0:   // of the returned frame. Return NULL on failure.
michael@0:   StackFrameARM* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
michael@0:                                          CFIFrameInfo* cfi_frame_info);
michael@0: 
michael@0:   // Use the frame pointer. The caller takes ownership of the returned frame.
michael@0:   // Return NULL on failure.
michael@0:   StackFrameARM* GetCallerByFramePointer(const vector<StackFrame*> &frames);
michael@0: 
michael@0:   // Scan the stack for plausible return addresses. The caller takes ownership
michael@0:   // of the returned frame. Return NULL on failure.
michael@0:   StackFrameARM* GetCallerByStackScan(const vector<StackFrame*> &frames);
michael@0: 
michael@0:   // Stores the CPU context corresponding to the youngest stack frame, to
michael@0:   // be returned by GetContextFrame.
michael@0:   const MDRawContextARM* context_;
michael@0: 
michael@0:   // The register to use a as frame pointer. The value is -1 if frame pointer
michael@0:   // cannot be used.
michael@0:   int fp_register_;
michael@0: 
michael@0:   // Validity mask for youngest stack frame. This is always
michael@0:   // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of
michael@0:   // unit tests.
michael@0:   int context_frame_validity_;
michael@0: };
michael@0: 
michael@0: 
michael@0: }  // namespace google_breakpad
michael@0: 
michael@0: 
michael@0: #endif  // PROCESSOR_STACKWALKER_ARM_H__