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ABIMacOSX_arm64.h
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1//===-- ABIMacOSX_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_ABIMACOSX_ARM64_H
10#define LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABIMACOSX_ARM64_H
11
14#include "lldb/lldb-private.h"
15
17public:
18 ~ABIMacOSX_arm64() override = default;
19
20 size_t GetRedZoneSize() const override;
21
23 lldb::addr_t functionAddress,
24 lldb::addr_t returnAddress,
25 llvm::ArrayRef<lldb::addr_t> args) const override;
26
28 lldb_private::ValueList &values) const override;
29
30 bool
32
33 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
34
35 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
36
37 // The arm64 ABI requires that stack frames be 16 byte aligned.
38 // When there is a trap handler on the stack, e.g. _sigtramp in userland
39 // code, we've seen that the stack pointer is often not aligned properly
40 // before the handler is invoked. This means that lldb will stop the unwind
41 // early -- before the function which caused the trap.
42 //
43 // To work around this, we relax that alignment to be just word-size
44 // (8-bytes).
45 // Allowing the trap handlers for user space would be easy (_sigtramp) but
46 // in other environments there can be a large number of different functions
47 // involved in async traps.
49 // Make sure the stack call frame addresses are are 8 byte aligned
50 if (cfa & (8ull - 1ull))
51 return false; // Not 8 byte aligned
52 if (cfa == 0)
53 return false; // Zero is not a valid stack address
54 return true;
55 }
56
58 if (pc & (4ull - 1ull))
59 return false; // Not 4 byte aligned
60
61 // Anything else if fair game..
62 return true;
63 }
64
66
67 // Static Functions
68
69 static void Initialize();
70
71 static void Terminate();
72
73 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
74
75 // PluginInterface protocol
76
77 static llvm::StringRef GetPluginNameStatic() { return "ABIMacOSX_arm64"; }
78
79 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
80
82 SetReturnValueObject(lldb::StackFrameSP &frame_sp,
83 lldb::ValueObjectSP &new_value) override;
84
85protected:
86 lldb::ValueObjectSP
88 lldb_private::CompilerType &ast_type) const override;
89
90private:
91 using ABIAArch64::ABIAArch64; // Call CreateInstance instead.
92};
93
94#endif // LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABIMACOSX_ARM64_H
~ABIMacOSX_arm64() override=default
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 llvm::StringRef GetPluginNameStatic()
lldb_private::Status SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override
bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override
size_t GetRedZoneSize() const override
bool CallFrameAddressIsValid(lldb::addr_t cfa) override
static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch)
bool CodeAddressIsValid(lldb::addr_t pc) override
static void Terminate()
static void Initialize()
lldb::ValueObjectSP GetReturnValueObjectImpl(lldb_private::Thread &thread, lldb_private::CompilerType &ast_type) const override
bool CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
bool GetArgumentValues(lldb_private::Thread &thread, lldb_private::ValueList &values) const override
lldb::addr_t FixAddress(lldb::addr_t pc, lldb::addr_t mask) override
bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override
llvm::StringRef GetPluginName() override
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