1 | // -*- mode: C++ -*- |
2 | |
3 | // Copyright (c) 2010 Google Inc. |
4 | // All rights reserved. |
5 | // |
6 | // Redistribution and use in source and binary forms, with or without |
7 | // modification, are permitted provided that the following conditions are |
8 | // met: |
9 | // |
10 | // * Redistributions of source code must retain the above copyright |
11 | // notice, this list of conditions and the following disclaimer. |
12 | // * Redistributions in binary form must reproduce the above |
13 | // copyright notice, this list of conditions and the following disclaimer |
14 | // in the documentation and/or other materials provided with the |
15 | // distribution. |
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18 | // this software without specific prior written permission. |
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30 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 | |
32 | // stackwalker_arm.h: arm-specific stackwalker. |
33 | // |
34 | // Provides stack frames given arm register context and a memory region |
35 | // corresponding to an arm stack. |
36 | // |
37 | // Author: Mark Mentovai, Ted Mielczarek |
38 | |
39 | |
40 | #ifndef PROCESSOR_STACKWALKER_ARM_H__ |
41 | #define PROCESSOR_STACKWALKER_ARM_H__ |
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 | |
47 | namespace google_breakpad { |
48 | |
49 | class CodeModules; |
50 | |
51 | class StackwalkerARM : public Stackwalker { |
52 | public: |
53 | // context is an arm context object that gives access to arm-specific |
54 | // register state corresponding to the innermost called frame to be |
55 | // included in the stack. The other arguments are passed directly through |
56 | // to the base Stackwalker constructor. |
57 | StackwalkerARM(const SystemInfo* system_info, |
58 | const MDRawContextARM* context, |
59 | int fp_register, |
60 | MemoryRegion* memory, |
61 | const CodeModules* modules, |
62 | StackFrameSymbolizer* frame_symbolizer); |
63 | |
64 | // Change the context validity mask of the frame returned by |
65 | // GetContextFrame to VALID. This is only for use by unit tests; the |
66 | // default behavior is correct for all application code. |
67 | void SetContextFrameValidity(int valid) { context_frame_validity_ = valid; } |
68 | |
69 | private: |
70 | // Implementation of Stackwalker, using arm context and stack conventions. |
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 | StackFrameARM* GetCallerByCFIFrameInfo(const vector<StackFrame*>& frames, |
79 | CFIFrameInfo* cfi_frame_info); |
80 | |
81 | // Use the frame pointer. The caller takes ownership of the returned frame. |
82 | // Return NULL on failure. |
83 | StackFrameARM* GetCallerByFramePointer(const vector<StackFrame*>& frames); |
84 | |
85 | // Scan the stack for plausible return addresses. The caller takes ownership |
86 | // of the returned frame. Return NULL on failure. |
87 | StackFrameARM* GetCallerByStackScan(const vector<StackFrame*>& frames); |
88 | |
89 | // Stores the CPU context corresponding to the youngest stack frame, to |
90 | // be returned by GetContextFrame. |
91 | const MDRawContextARM* context_; |
92 | |
93 | // The register to use a as frame pointer. The value is -1 if frame pointer |
94 | // cannot be used. |
95 | int fp_register_; |
96 | |
97 | // Validity mask for youngest stack frame. This is always |
98 | // CONTEXT_VALID_ALL in real use; it is only changeable for the sake of |
99 | // unit tests. |
100 | int context_frame_validity_; |
101 | }; |
102 | |
103 | |
104 | } // namespace google_breakpad |
105 | |
106 | |
107 | #endif // PROCESSOR_STACKWALKER_ARM_H__ |
108 | |