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ABISysV_arm64.h
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1//===-- ABISysV_arm64.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_AARCH64_ABISYSV_ARM64_H
10#define LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABISYSV_ARM64_H
11
13#include "lldb/lldb-private.h"
14
15class ABISysV_arm64 : public ABIAArch64 {
16public:
17 ~ABISysV_arm64() override = default;
18
19 size_t GetRedZoneSize() const override;
20
22 lldb::addr_t functionAddress,
23 lldb::addr_t returnAddress,
24 llvm::ArrayRef<lldb::addr_t> args) const override;
25
27 lldb_private::ValueList &values) const override;
28
30 SetReturnValueObject(lldb::StackFrameSP &frame_sp,
31 lldb::ValueObjectSP &new_value) override;
32
33 bool
35
36 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
37
38 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
39
40 // The arm64 ABI requires that stack frames be 16 byte aligned.
41 // When there is a trap handler on the stack, e.g. _sigtramp in userland
42 // code, we've seen that the stack pointer is often not aligned properly
43 // before the handler is invoked. This means that lldb will stop the unwind
44 // early -- before the function which caused the trap.
45 //
46 // To work around this, we relax that alignment to be just word-size
47 // (8-bytes).
48 // Allowing the trap handlers for user space would be easy (_sigtramp) but
49 // in other environments there can be a large number of different functions
50 // involved in async traps.
52 // Make sure the stack call frame addresses are are 8 byte aligned
53 if (cfa & (8ull - 1ull))
54 return false; // Not 8 byte aligned
55 if (cfa == 0)
56 return false; // Zero is not a valid stack address
57 return true;
58 }
59
61 if (pc & (4ull - 1ull))
62 return false; // Not 4 byte aligned
63
64 // Anything else if fair game..
65 return true;
66 }
67
68 bool GetPointerReturnRegister(const char *&name) override;
69
71
72 // Static Functions
73
74 static void Initialize();
75
76 static void Terminate();
77
78 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
79
80 static llvm::StringRef GetPluginNameStatic() { return "SysV-arm64"; }
81
82 // PluginInterface protocol
83
84 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
85
88
89protected:
90 lldb::ValueObjectSP
92 lldb_private::CompilerType &ast_type) const override;
93
94private:
95 using ABIAArch64::ABIAArch64; // Call CreateInstance instead.
96};
97
98#endif // LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABISYSV_ARM64_H
lldb::ValueObjectSP GetReturnValueObjectImpl(lldb_private::Thread &thread, lldb_private::CompilerType &ast_type) const 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
static void Initialize()
bool GetArgumentValues(lldb_private::Thread &thread, lldb_private::ValueList &values) const override
static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch)
bool CodeAddressIsValid(lldb::addr_t pc) override
Definition: ABISysV_arm64.h:60
lldb_private::Status SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override
lldb::addr_t FixCodeAddress(lldb::addr_t pc) override
Some targets might use bits in a code address to indicate a mode switch.
lldb::addr_t FixDataAddress(lldb::addr_t pc) override
bool GetPointerReturnRegister(const char *&name) override
lldb::addr_t FixAddress(lldb::addr_t pc, lldb::addr_t mask) override
bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override
static llvm::StringRef GetPluginNameStatic()
Definition: ABISysV_arm64.h:80
size_t GetRedZoneSize() const override
~ABISysV_arm64() override=default
bool CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
static void Terminate()
bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
llvm::StringRef GetPluginName() override
Definition: ABISysV_arm64.h:84
bool CallFrameAddressIsValid(lldb::addr_t cfa) override
Definition: ABISysV_arm64.h:51
An architecture specification class.
Definition: ArchSpec.h:32
Generic representation of a type in a programming language.
Definition: CompilerType.h:36
An error handling class.
Definition: Status.h:44
uint64_t addr_t
Definition: lldb-types.h:83