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Diffstat (limited to 'source/Plugins/ABI/SysV-i386/ABISysV_i386.h')
-rw-r--r-- | source/Plugins/ABI/SysV-i386/ABISysV_i386.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/source/Plugins/ABI/SysV-i386/ABISysV_i386.h b/source/Plugins/ABI/SysV-i386/ABISysV_i386.h new file mode 100644 index 000000000000..9612f900d2ce --- /dev/null +++ b/source/Plugins/ABI/SysV-i386/ABISysV_i386.h @@ -0,0 +1,138 @@ +//===------------------- ABISysV_i386.h -------------------------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// + +#ifndef liblldb_ABISysV_i386_h_ +#define liblldb_ABISysV_i386_h_ + +// C Includes +// C++ Includes +// Other libraries and framework includes +// Project includes +#include "lldb/lldb-private.h" +#include "lldb/Target/ABI.h" + +class ABISysV_i386 : + public lldb_private::ABI +{ +public: + + ~ABISysV_i386() + { + } + + size_t + GetRedZoneSize () const override + { + return 0; // There is no red zone for i386 Architecture + } + + bool + PrepareTrivialCall (lldb_private::Thread &thread, + lldb::addr_t sp, + lldb::addr_t functionAddress, + lldb::addr_t returnAddress, + llvm::ArrayRef<lldb::addr_t> args) const override; + + bool + GetArgumentValues (lldb_private::Thread &thread, + lldb_private::ValueList &values) const override; + + lldb_private::Error + SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) override; + +protected: + lldb::ValueObjectSP + GetReturnValueObjectSimple (lldb_private::Thread &thread, + lldb_private::ClangASTType &ast_type) const; + + bool + RegisterIsCalleeSaved (const lldb_private::RegisterInfo *reg_info); + +public: + lldb::ValueObjectSP + GetReturnValueObjectImpl (lldb_private::Thread &thread, + lldb_private::ClangASTType &type) const override; + + bool + CreateFunctionEntryUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override; + + bool + CreateDefaultUnwindPlan (lldb_private::UnwindPlan &unwind_plan) override; + + bool + RegisterIsVolatile (const lldb_private::RegisterInfo *reg_info) override + { + return !RegisterIsCalleeSaved (reg_info); + } + + // The SysV i386 ABI requires that stack frames be 16 byte aligned. + // When there is a trap handler on the stack, e.g. _sigtramp in userland + // code, we've seen that the stack pointer is often not aligned properly + // before the handler is invoked. This means that lldb will stop the unwind + // early -- before the function which caused the trap. + // + // To work around this, we relax that alignment to be just word-size (4-bytes). + // Whitelisting the trap handlers for user space would be easy (_sigtramp) but + // in other environments there can be a large number of different functions + // involved in async traps. + + // ToDo: When __m256 arguments are passed then stack frames should be + // 32 byte aligned. Decide what to do for 32 byte alignment checking + bool + CallFrameAddressIsValid (lldb::addr_t cfa) override + { + // Make sure the stack call frame addresses are 4 byte aligned + if (cfa & (4ull - 1ull)) + return false; // Not 4 byte aligned + if (cfa == 0) + return false; // Zero is not a valid stack address + return true; + } + + bool + CodeAddressIsValid (lldb::addr_t pc) override + { + // Check whether the address is a valid 32 bit address + return (pc <= UINT32_MAX); + } + + const lldb_private::RegisterInfo * + GetRegisterInfoArray (uint32_t &count) override; + //------------------------------------------------------------------ + // Static Functions + //------------------------------------------------------------------ + static void + Initialize(); + + static void + Terminate(); + + static lldb::ABISP + CreateInstance (const lldb_private::ArchSpec &arch); + + //------------------------------------------------------------------ + // PluginInterface protocol + //------------------------------------------------------------------ + static lldb_private::ConstString + GetPluginNameStatic(); + + lldb_private::ConstString + GetPluginName() override; + + uint32_t + GetPluginVersion() override + { + return 1; + } + +private: + ABISysV_i386() : lldb_private::ABI() { } // Call CreateInstance instead. +}; + +#endif // liblldb_ABI_h |