1//===-- ABISysV_ppc64.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_POWERPC_ABISYSV_PPC64_H
10#define LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC64_H
11
12#include "lldb/Target/ABI.h"
13#include "lldb/lldb-private.h"
14
15class ABISysV_ppc64 : public lldb_private::RegInfoBasedABI {
16public:
17 ~ABISysV_ppc64() 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 lldb::ValueObjectSP
34 GetReturnValueObjectImpl(lldb_private::Thread &thread,
35 lldb_private::CompilerType &type) const override;
36
37 bool
38 CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
39
40 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
41
42 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
43
44 // The SysV ppc64 ABI requires that stack frames be 16 byte aligned.
45 // When there is a trap handler on the stack, e.g. _sigtramp in userland
46 // code, we've seen that the stack pointer is often not aligned properly
47 // before the handler is invoked. This means that lldb will stop the unwind
48 // early -- before the function which caused the trap.
49 //
50 // To work around this, we relax that alignment to be just word-size
51 // (8-bytes).
52 // Allowing the trap handlers for user space would be easy (_sigtramp) but
53 // in other environments there can be a large number of different functions
54 // involved in async traps.
55 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
56 // Make sure the stack call frame addresses are 8 byte aligned
57 if (cfa & (8ull - 1ull))
58 return false; // Not 8 byte aligned
59 if (cfa == 0)
60 return false; // Zero is not a valid stack address
61 return true;
62 }
63
64 bool CodeAddressIsValid(lldb::addr_t pc) override {
65 // We have a 64 bit address space, so anything is valid as opcodes
66 // aren't fixed width...
67 return true;
68 }
69
70 const lldb_private::RegisterInfo *
71 GetRegisterInfoArray(uint32_t &count) override;
72
73 // Static Functions
74
75 static void Initialize();
76
77 static void Terminate();
78
79 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
80
81 static llvm::StringRef GetPluginNameStatic() { return "sysv-ppc64"; }
82
83 // PluginInterface protocol
84
85 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
86
87protected:
88 void CreateRegisterMapIfNeeded();
89
90 lldb::ValueObjectSP
91 GetReturnValueObjectSimple(lldb_private::Thread &thread,
92 lldb_private::CompilerType &ast_type) const;
93
94 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
95
96private:
97 using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead.
98
99 lldb::ByteOrder GetByteOrder() const;
100};
101
102#endif // LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC64_H
103

source code of lldb/source/Plugins/ABI/PowerPC/ABISysV_ppc64.h