1 //===------------------- ABISysV_i386.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_i386_h_
11 #define liblldb_ABISysV_i386_h_
15 // Other libraries and framework includes
17 #include "lldb/lldb-private.h"
18 #include "lldb/Target/ABI.h"
21 public lldb_private::ABI
30 GetRedZoneSize () const override
32 return 0; // There is no red zone for i386 Architecture
36 PrepareTrivialCall (lldb_private::Thread &thread,
38 lldb::addr_t functionAddress,
39 lldb::addr_t returnAddress,
40 llvm::ArrayRef<lldb::addr_t> args) const override;
43 GetArgumentValues (lldb_private::Thread &thread,
44 lldb_private::ValueList &values) const override;
47 SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override;
51 GetReturnValueObjectSimple (lldb_private::Thread &thread,
52 lldb_private::ClangASTType &ast_type) const;
55 RegisterIsCalleeSaved (const lldb_private::RegisterInfo *reg_info);
59 GetReturnValueObjectImpl (lldb_private::Thread &thread,
60 lldb_private::ClangASTType &type) const override;
63 CreateFunctionEntryUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override;
66 CreateDefaultUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override;
69 RegisterIsVolatile (const lldb_private::RegisterInfo *reg_info) override
71 return !RegisterIsCalleeSaved (reg_info);
74 // The SysV i386 ABI requires that stack frames be 16 byte aligned.
75 // When there is a trap handler on the stack, e.g. _sigtramp in userland
76 // code, we've seen that the stack pointer is often not aligned properly
77 // before the handler is invoked. This means that lldb will stop the unwind
78 // early -- before the function which caused the trap.
80 // To work around this, we relax that alignment to be just word-size (4-bytes).
81 // Whitelisting the trap handlers for user space would be easy (_sigtramp) but
82 // in other environments there can be a large number of different functions
83 // involved in async traps.
85 // ToDo: When __m256 arguments are passed then stack frames should be
86 // 32 byte aligned. Decide what to do for 32 byte alignment checking
88 CallFrameAddressIsValid (lldb::addr_t cfa) override
90 // Make sure the stack call frame addresses are 4 byte aligned
91 if (cfa & (4ull - 1ull))
92 return false; // Not 4 byte aligned
94 return false; // Zero is not a valid stack address
99 CodeAddressIsValid (lldb::addr_t pc) override
101 // Check whether the address is a valid 32 bit address
102 return (pc <= UINT32_MAX);
105 const lldb_private::RegisterInfo *
106 GetRegisterInfoArray (uint32_t &count) override;
107 //------------------------------------------------------------------
109 //------------------------------------------------------------------
117 CreateInstance (const lldb_private::ArchSpec &arch);
119 //------------------------------------------------------------------
120 // PluginInterface protocol
121 //------------------------------------------------------------------
122 static lldb_private::ConstString
123 GetPluginNameStatic();
125 lldb_private::ConstString
126 GetPluginName() override;
129 GetPluginVersion() override
135 ABISysV_i386() : lldb_private::ABI() { } // Call CreateInstance instead.
138 #endif // liblldb_ABI_h