1//===-- ABISysV_x86_64.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 LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
10#define LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
11
12#include "Plugins/ABI/X86/ABIX86_64.h"
13
14class ABISysV_x86_64 : public ABIX86_64 {
15public:
16 ~ABISysV_x86_64() override = default;
17
18 size_t GetRedZoneSize() const override;
19
20 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
21 lldb::addr_t functionAddress,
22 lldb::addr_t returnAddress,
23 llvm::ArrayRef<lldb::addr_t> args) const override;
24
25 bool GetArgumentValues(lldb_private::Thread &thread,
26 lldb_private::ValueList &values) const override;
27
28 lldb_private::Status
29 SetReturnValueObject(lldb::StackFrameSP &frame_sp,
30 lldb::ValueObjectSP &new_value) override;
31
32 lldb::ValueObjectSP
33 GetReturnValueObjectImpl(lldb_private::Thread &thread,
34 lldb_private::CompilerType &type) const override;
35
36 lldb::UnwindPlanSP CreateFunctionEntryUnwindPlan() override;
37
38 lldb::UnwindPlanSP CreateDefaultUnwindPlan() override;
39
40 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
41
42 // The SysV x86_64 ABI requires that stack frames be 16 byte aligned.
43 // When there is a trap handler on the stack, e.g. _sigtramp in userland
44 // code, we've seen that the stack pointer is often not aligned properly
45 // before the handler is invoked. This means that lldb will stop the unwind
46 // early -- before the function which caused the trap.
47 //
48 // To work around this, we relax that alignment to be just word-size
49 // (8-bytes).
50 // Allowing the trap handlers for user space would be easy (_sigtramp) but
51 // in other environments there can be a large number of different functions
52 // involved in async traps.
53 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
54 // Make sure the stack call frame addresses are 8 byte aligned
55 if (cfa & (8ull - 1ull))
56 return false; // Not 8 byte aligned
57 if (cfa == 0)
58 return false; // Zero is not a valid stack address
59 return true;
60 }
61
62 bool CodeAddressIsValid(lldb::addr_t pc) override {
63 // We have a 64 bit address space, so anything is valid as opcodes
64 // aren't fixed width...
65 return true;
66 }
67
68 bool GetPointerReturnRegister(const char *&name) override;
69
70 // Static Functions
71
72 static void Initialize();
73
74 static void Terminate();
75
76 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
77
78 static llvm::StringRef GetPluginNameStatic() { return "sysv-x86_64"; }
79
80 // PluginInterface protocol
81 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
82
83protected:
84 void CreateRegisterMapIfNeeded();
85
86 lldb::ValueObjectSP
87 GetReturnValueObjectSimple(lldb_private::Thread &thread,
88 lldb_private::CompilerType &ast_type) const;
89
90 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
91 uint32_t GetGenericNum(llvm::StringRef reg) override;
92
93private:
94 using ABIX86_64::ABIX86_64; // Call CreateInstance instead.
95};
96
97#endif // LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
98

source code of lldb/source/Plugins/ABI/X86/ABISysV_x86_64.h