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ABISysV_x86_64.h
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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
13
14class ABISysV_x86_64 : public ABIX86_64 {
15public:
16 ~ABISysV_x86_64() override = default;
17
18 size_t GetRedZoneSize() const override;
19
21 lldb::addr_t functionAddress,
22 lldb::addr_t returnAddress,
23 llvm::ArrayRef<lldb::addr_t> args) const override;
24
26 lldb_private::ValueList &values) const override;
27
30 lldb::ValueObjectSP &new_value) override;
31
34 lldb_private::CompilerType &type) const override;
35
36 bool
38
39 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
40
41 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
42
43 // The SysV x86_64 ABI requires that stack frames be 16 byte aligned.
44 // When there is a trap handler on the stack, e.g. _sigtramp in userland
45 // code, we've seen that the stack pointer is often not aligned properly
46 // before the handler is invoked. This means that lldb will stop the unwind
47 // early -- before the function which caused the trap.
48 //
49 // To work around this, we relax that alignment to be just word-size
50 // (8-bytes).
51 // Allowing the trap handlers for user space would be easy (_sigtramp) but
52 // in other environments there can be a large number of different functions
53 // involved in async traps.
55 // Make sure the stack call frame addresses are 8 byte aligned
56 if (cfa & (8ull - 1ull))
57 return false; // Not 8 byte aligned
58 if (cfa == 0)
59 return false; // Zero is not a valid stack address
60 return true;
61 }
62
64 // We have a 64 bit address space, so anything is valid as opcodes
65 // aren't fixed width...
66 return true;
67 }
68
69 bool GetPointerReturnRegister(const char *&name) override;
70
71 // Static Functions
72
73 static void Initialize();
74
75 static void Terminate();
76
78
79 static llvm::StringRef GetPluginNameStatic() { return "sysv-x86_64"; }
80
81 // PluginInterface protocol
82 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
83
84protected:
86
89 lldb_private::CompilerType &ast_type) const;
90
92 uint32_t GetGenericNum(llvm::StringRef reg) override;
93
94private:
95 using ABIX86_64::ABIX86_64; // Call CreateInstance instead.
96};
97
98#endif // LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H
bool CodeAddressIsValid(lldb::addr_t pc) override
bool CallFrameAddressIsValid(lldb::addr_t cfa) override
bool GetArgumentValues(lldb_private::Thread &thread, lldb_private::ValueList &values) const override
static void Terminate()
bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch)
~ABISysV_x86_64() override=default
bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info)
bool GetPointerReturnRegister(const char *&name) override
llvm::StringRef GetPluginName() override
lldb_private::Status SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override
uint32_t GetGenericNum(llvm::StringRef reg) override
Return the generic number of the given register.
lldb::ValueObjectSP GetReturnValueObjectImpl(lldb_private::Thread &thread, lldb_private::CompilerType &type) const override
static void Initialize()
void CreateRegisterMapIfNeeded()
size_t GetRedZoneSize() const override
lldb::ValueObjectSP GetReturnValueObjectSimple(lldb_private::Thread &thread, lldb_private::CompilerType &ast_type) const
static llvm::StringRef GetPluginNameStatic()
bool CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override
bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp, lldb::addr_t functionAddress, lldb::addr_t returnAddress, llvm::ArrayRef< lldb::addr_t > args) const override
An architecture specification class.
Definition: ArchSpec.h:31
Generic representation of a type in a programming language.
Definition: CompilerType.h:36
An error handling class.
Definition: Status.h:44
std::shared_ptr< lldb_private::ABI > ABISP
Definition: lldb-forward.h:312
std::shared_ptr< lldb_private::StackFrame > StackFrameSP
Definition: lldb-forward.h:415
std::shared_ptr< lldb_private::ValueObject > ValueObjectSP
Definition: lldb-forward.h:475
std::shared_ptr< lldb_private::Process > ProcessSP
Definition: lldb-forward.h:384
uint64_t addr_t
Definition: lldb-types.h:80
Every register is described in detail including its name, alternate name (optional),...