1 //===-- ABISysV_ppc.h ----------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_ABISysV_ppc_h_
11 #define liblldb_ABISysV_ppc_h_
13 #include "lldb/Target/ABI.h"
14 #include "lldb/lldb-private.h"
16 class ABISysV_ppc : public lldb_private::ABI {
18 ~ABISysV_ppc() override = default;
20 size_t GetRedZoneSize() const override;
22 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
23 lldb::addr_t functionAddress,
24 lldb::addr_t returnAddress,
25 llvm::ArrayRef<lldb::addr_t> args) const override;
27 bool GetArgumentValues(lldb_private::Thread &thread,
28 lldb_private::ValueList &values) const override;
31 SetReturnValueObject(lldb::StackFrameSP &frame_sp,
32 lldb::ValueObjectSP &new_value) override;
35 GetReturnValueObjectImpl(lldb_private::Thread &thread,
36 lldb_private::CompilerType &type) const override;
39 CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
41 bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
43 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
45 // The SysV ppc ABI requires that stack frames be 16 byte aligned.
46 // When there is a trap handler on the stack, e.g. _sigtramp in userland
47 // code, we've seen that the stack pointer is often not aligned properly
48 // before the handler is invoked. This means that lldb will stop the unwind
49 // early -- before the function which caused the trap.
51 // To work around this, we relax that alignment to be just word-size
53 // Whitelisting the trap handlers for user space would be easy (_sigtramp) but
54 // in other environments there can be a large number of different functions
55 // involved in async traps.
56 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
57 // Make sure the stack call frame addresses are 8 byte aligned
58 if (cfa & (8ull - 1ull))
59 return false; // Not 8 byte aligned
61 return false; // Zero is not a valid stack address
65 bool CodeAddressIsValid(lldb::addr_t pc) override {
66 // We have a 64 bit address space, so anything is valid as opcodes
67 // aren't fixed width...
71 const lldb_private::RegisterInfo *
72 GetRegisterInfoArray(uint32_t &count) override;
74 //------------------------------------------------------------------
76 //------------------------------------------------------------------
78 static void Initialize();
80 static void Terminate();
82 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
84 static lldb_private::ConstString GetPluginNameStatic();
86 //------------------------------------------------------------------
87 // PluginInterface protocol
88 //------------------------------------------------------------------
90 lldb_private::ConstString GetPluginName() override;
92 uint32_t GetPluginVersion() override;
95 void CreateRegisterMapIfNeeded();
98 GetReturnValueObjectSimple(lldb_private::Thread &thread,
99 lldb_private::CompilerType &ast_type) const;
101 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);
104 ABISysV_ppc(lldb::ProcessSP process_sp) : lldb_private::ABI(process_sp) {
105 // Call CreateInstance instead.
109 #endif // liblldb_ABISysV_ppc_h_