1 //===-- ABIMacOSX_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_ABIMacOSX_i386_h_
11 #define liblldb_ABIMacOSX_i386_h_
15 // Other libraries and framework includes
17 #include "lldb/lldb-private.h"
18 #include "lldb/Target/ABI.h"
19 #include "lldb/Core/Value.h"
21 class ABIMacOSX_i386 :
22 public lldb_private::ABI
29 GetRedZoneSize () const;
32 PrepareTrivialCall (lldb_private::Thread &thread,
34 lldb::addr_t func_addr,
35 lldb::addr_t return_addr,
36 llvm::ArrayRef<lldb::addr_t> args) const;
39 PrepareNormalCall (lldb_private::Thread &thread,
41 lldb::addr_t func_addr,
42 lldb::addr_t return_addr,
43 lldb_private::ValueList &args) const;
46 GetArgumentValues (lldb_private::Thread &thread,
47 lldb_private::ValueList &values) const;
49 virtual lldb_private::Error
50 SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value);
53 virtual lldb::ValueObjectSP
54 GetReturnValueObjectImpl (lldb_private::Thread &thread,
55 lldb_private::ClangASTType &ast_type) const;
60 CreateFunctionEntryUnwindPlan (lldb_private::UnwindPlan &unwind_plan);
63 CreateDefaultUnwindPlan (lldb_private::UnwindPlan &unwind_plan);
66 RegisterIsVolatile (const lldb_private::RegisterInfo *reg_info);
68 // The Darwin i386 ABI requires that stack frames be 16 byte aligned.
69 // When there is a trap handler on the stack, e.g. _sigtramp in userland
70 // code, we've seen that the stack pointer is often not aligned properly
71 // before the handler is invoked. This means that lldb will stop the unwind
72 // early -- before the function which caused the trap.
74 // To work around this, we relax that alignment to be just word-size (4-bytes).
75 // Whitelisting the trap handlers for user space would be easy (_sigtramp) but
76 // in other environments there can be a large number of different functions
77 // involved in async traps.
79 // If we were to enforce 16-byte alignment, we also need to relax to 4-byte
80 // alignment for non-darwin i386 targets.
82 CallFrameAddressIsValid (lldb::addr_t cfa)
84 // Make sure the stack call frame addresses are are 4 byte aligned
85 if (cfa & (4ull - 1ull))
86 return false; // Not 4 byte aligned
88 return false; // Zero is not a valid stack address
93 CodeAddressIsValid (lldb::addr_t pc)
95 // Just make sure the address is a valid 32 bit address.
96 return pc <= UINT32_MAX;
99 virtual const lldb_private::RegisterInfo *
100 GetRegisterInfoArray (uint32_t &count);
102 //------------------------------------------------------------------
104 //------------------------------------------------------------------
112 CreateInstance (const lldb_private::ArchSpec &arch);
114 //------------------------------------------------------------------
115 // PluginInterface protocol
116 //------------------------------------------------------------------
117 static lldb_private::ConstString
118 GetPluginNameStatic ();
120 virtual lldb_private::ConstString
128 RegisterIsCalleeSaved (const lldb_private::RegisterInfo *reg_info);
131 ABIMacOSX_i386() : lldb_private::ABI() { } // Call CreateInstance instead.
135 #endif // liblldb_ABI_h_