ABISysV_mips64.h revision 360784 
1//===-- ABISysV_mips64.h ----------------------------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef liblldb_ABISysV_mips64_h_
10#define liblldb_ABISysV_mips64_h_
11
12#include "lldb/Target/ABI.h"
13#include "lldb/lldb-private.h"
14
15class ABISysV_mips64 : public lldb_private::ABI {
16public:
17  ~ABISysV_mips64() override = default;
18
19  size_t GetRedZoneSize() const override;
20
21  bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
22                          lldb::addr_t functionAddress,
23                          lldb::addr_t returnAddress,
24                          llvm::ArrayRef<lldb::addr_t> args) const override;
25
26  bool GetArgumentValues(lldb_private::Thread &thread,
27                         lldb_private::ValueList &values) const override;
28
29  lldb_private::Status
30  SetReturnValueObject(lldb::StackFrameSP &frame_sp,
31                       lldb::ValueObjectSP &new_value) override;
32
33  lldb::ValueObjectSP
34  GetReturnValueObjectImpl(lldb_private::Thread &thread,
35                           lldb_private::CompilerType &type) const override;
36
37  bool
38  CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
39
40  bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
41
42  bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
43
44  bool IsSoftFloat(uint32_t fp_flag) const;
45
46  // The SysV mips ABI requires that stack frames be 16 byte aligned.
47  // When there is a trap handler on the stack, e.g. _sigtramp in userland
48  // code, we've seen that the stack pointer is often not aligned properly
49  // before the handler is invoked.  This means that lldb will stop the unwind
50  // early -- before the function which caused the trap.
51  //
52  // To work around this, we relax that alignment to be just word-size
53  // (8-bytes).
54  // Whitelisting the trap handlers for user space would be easy (_sigtramp) but
55  // in other environments there can be a large number of different functions
56  // involved in async traps.
57  bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
58    // Make sure the stack call frame addresses are 8 byte aligned
59    if (cfa & (8ull - 1ull))
60      return false; // Not 8 byte aligned
61    if (cfa == 0)
62      return false; // Zero is not a valid stack address
63    return true;
64  }
65
66  bool CodeAddressIsValid(lldb::addr_t pc) override {
67    if (pc & (4ull - 1ull))
68      return false; // Not 4 byte aligned
69
70    // Anything else if fair game..
71    return true;
72  }
73
74  const lldb_private::RegisterInfo *
75  GetRegisterInfoArray(uint32_t &count) override;
76
77  // Static Functions
78
79  static void Initialize();
80
81  static void Terminate();
82
83  static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
84
85  static lldb_private::ConstString GetPluginNameStatic();
86
87  // PluginInterface protocol
88
89  lldb_private::ConstString GetPluginName() override;
90
91  uint32_t GetPluginVersion() override;
92
93protected:
94  void CreateRegisterMapIfNeeded();
95
96  lldb::ValueObjectSP
97  GetReturnValueObjectSimple(lldb_private::Thread &thread,
98                             lldb_private::CompilerType &ast_type) const;
99
100  bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
101
102private:
103  ABISysV_mips64(lldb::ProcessSP process_sp,
104                 std::unique_ptr<llvm::MCRegisterInfo> info_up)
105      : lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
106    // Call CreateInstance instead.
107  }
108};
109
110#endif // liblldb_ABISysV_mips64_h_
111