1//===-- ABISysV_ppc.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_PPC_H
10#define LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC_H
11
12#include "lldb/Target/ABI.h"
13#include "lldb/lldb-private.h"
14
15class ABISysV_ppc : public lldb_private::RegInfoBasedABI {
16public:
17 ~ABISysV_ppc() 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 lldb::UnwindPlanSP CreateFunctionEntryUnwindPlan() override;
38
39 lldb::UnwindPlanSP CreateDefaultUnwindPlan() override;
40
41 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
42
43 // The SysV ppc 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.
54 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
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
63 bool CodeAddressIsValid(lldb::addr_t pc) override {
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 const lldb_private::RegisterInfo *
70 GetRegisterInfoArray(uint32_t &count) override;
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-ppc"; }
81
82 // PluginInterface protocol
83
84 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
85
86protected:
87 void CreateRegisterMapIfNeeded();
88
89 lldb::ValueObjectSP
90 GetReturnValueObjectSimple(lldb_private::Thread &thread,
91 lldb_private::CompilerType &ast_type) const;
92
93 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
94
95private:
96 using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead.
97};
98
99#endif // LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC_H
100

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