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
12#include "Plugins/ABI/AArch64/ABIAArch64.h"
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
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 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
34
35 // The arm64 ABI requires that stack frames be 16 byte aligned.
36 // When there is a trap handler on the stack, e.g. _sigtramp in userland
37 // code, we've seen that the stack pointer is often not aligned properly
38 // before the handler is invoked. This means that lldb will stop the unwind
39 // early -- before the function which caused the trap.
40 //
41 // To work around this, we relax that alignment to be just word-size
42 // (8-bytes).
43 // Allowing the trap handlers for user space would be easy (_sigtramp) but
44 // in other environments there can be a large number of different functions
45 // involved in async traps.
46 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
47 // Make sure the stack call frame addresses are 8 byte aligned
48 if (cfa & (8ull - 1ull))
49 return false; // Not 8 byte aligned
50 if (cfa == 0)
51 return false; // Zero is not a valid stack address
52 return true;
53 }
54
55 bool CodeAddressIsValid(lldb::addr_t pc) override {
56 if (pc & (4ull - 1ull))
57 return false; // Not 4 byte aligned
58
59 // Anything else if fair game..
60 return true;
61 }
62
63 bool GetPointerReturnRegister(const char *&name) override;
64
65 lldb::addr_t FixAddress(lldb::addr_t pc, lldb::addr_t mask) override;
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 static llvm::StringRef GetPluginNameStatic() { return "SysV-arm64"; }
76
77 // PluginInterface protocol
78
79 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
80
81 lldb::addr_t FixCodeAddress(lldb::addr_t pc) override;
82 lldb::addr_t FixDataAddress(lldb::addr_t pc) override;
83
84protected:
85 lldb::ValueObjectSP
86 GetReturnValueObjectImpl(lldb_private::Thread &thread,
87 lldb_private::CompilerType &ast_type) const override;
88
89private:
90 using ABIAArch64::ABIAArch64; // Call CreateInstance instead.
91};
92
93#endif // LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABISYSV_ARM64_H
94

source code of lldb/source/Plugins/ABI/AArch64/ABISysV_arm64.h