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1 // Copyright (c) 2010 Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 //     * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 //     * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 //     * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 
30 // stackwalker_amd64.h: amd64-specific stackwalker.
31 //
32 // Provides stack frames given amd64 register context and a memory region
33 // corresponding to a amd64 stack.
34 //
35 // Author: Mark Mentovai, Ted Mielczarek
36 
37 
38 #ifndef PROCESSOR_STACKWALKER_AMD64_H__
39 #define PROCESSOR_STACKWALKER_AMD64_H__
40 
41 #include <vector>
42 
43 #include "google_breakpad/common/breakpad_types.h"
44 #include "google_breakpad/common/minidump_format.h"
45 #include "google_breakpad/processor/stackwalker.h"
46 #include "google_breakpad/processor/stack_frame_cpu.h"
47 #include "processor/cfi_frame_info.h"
48 
49 namespace google_breakpad {
50 
51 class CodeModules;
52 
53 class StackwalkerAMD64 : public Stackwalker {
54  public:
55   // context is a amd64 context object that gives access to amd64-specific
56   // register state corresponding to the innermost called frame to be
57   // included in the stack.  The other arguments are passed directly through
58   // to the base Stackwalker constructor.
59   StackwalkerAMD64(const SystemInfo* system_info,
60                    const MDRawContextAMD64* context,
61                    MemoryRegion* memory,
62                    const CodeModules* modules,
63                    StackFrameSymbolizer* frame_symbolizer);
64 
65  private:
66   // A STACK CFI-driven frame walker for the AMD64
67   typedef SimpleCFIWalker<uint64_t, MDRawContextAMD64> CFIWalker;
68 
69   // Implementation of Stackwalker, using amd64 context (stack pointer in %rsp,
70   // stack base in %rbp) and stack conventions (saved stack pointer at 0(%rbp))
71   virtual StackFrame* GetContextFrame();
72   virtual StackFrame* GetCallerFrame(const CallStack* stack,
73                                      bool stack_scan_allowed);
74 
75   // Use cfi_frame_info (derived from STACK CFI records) to construct
76   // the frame that called frames.back(). The caller takes ownership
77   // of the returned frame. Return NULL on failure.
78   StackFrameAMD64* GetCallerByCFIFrameInfo(const vector<StackFrame*> &frames,
79                                            CFIFrameInfo* cfi_frame_info);
80 
81   // Assumes a traditional frame layout where the frame pointer has not been
82   // omitted. The expectation is that caller's %rbp is pushed to the stack
83   // after the return address of the callee, and that the callee's %rsp can
84   // be used to find the pushed %rbp.
85   // Caller owns the returned frame object. Returns NULL on failure.
86   StackFrameAMD64* GetCallerByFramePointerRecovery(
87       const vector<StackFrame*>& frames);
88 
89   // Scan the stack for plausible return addresses. The caller takes ownership
90   // of the returned frame. Return NULL on failure.
91   StackFrameAMD64* GetCallerByStackScan(const vector<StackFrame*> &frames);
92 
93   // Stores the CPU context corresponding to the innermost stack frame to
94   // be returned by GetContextFrame.
95   const MDRawContextAMD64* context_;
96 
97   // Our register map, for cfi_walker_.
98   static const CFIWalker::RegisterSet cfi_register_map_[];
99 
100   // Our CFI frame walker.
101   const CFIWalker cfi_walker_;
102 };
103 
104 
105 }  // namespace google_breakpad
106 
107 
108 #endif  // PROCESSOR_STACKWALKER_AMD64_H__
109