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1//===-- ABISysV_x86_64.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-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H10#define LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H11 12#include "Plugins/ABI/X86/ABIX86_64.h"13 14class ABISysV_x86_64 : public ABIX86_64 {15public:16 ~ABISysV_x86_64() override = default;17 18 size_t GetRedZoneSize() const override;19 20 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,21 lldb::addr_t functionAddress,22 lldb::addr_t returnAddress,23 llvm::ArrayRef<lldb::addr_t> args) const override;24 25 bool GetArgumentValues(lldb_private::Thread &thread,26 lldb_private::ValueList &values) const override;27 28 lldb_private::Status29 SetReturnValueObject(lldb::StackFrameSP &frame_sp,30 lldb::ValueObjectSP &new_value) override;31 32 lldb::ValueObjectSP33 GetReturnValueObjectImpl(lldb_private::Thread &thread,34 lldb_private::CompilerType &type) const override;35 36 lldb::UnwindPlanSP CreateFunctionEntryUnwindPlan() override;37 38 lldb::UnwindPlanSP CreateDefaultUnwindPlan() override;39 40 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;41 42 // The SysV x86_64 ABI requires that stack frames be 16 byte aligned.43 // When there is a trap handler on the stack, e.g. _sigtramp in userland44 // code, we've seen that the stack pointer is often not aligned properly45 // before the handler is invoked. This means that lldb will stop the unwind46 // early -- before the function which caused the trap.47 //48 // To work around this, we relax that alignment to be just word-size49 // (8-bytes).50 // Allowing the trap handlers for user space would be easy (_sigtramp) but51 // in other environments there can be a large number of different functions52 // involved in async traps.53 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {54 // Make sure the stack call frame addresses are 8 byte aligned55 if (cfa & (8ull - 1ull))56 return false; // Not 8 byte aligned57 if (cfa == 0)58 return false; // Zero is not a valid stack address59 return true;60 }61 62 bool CodeAddressIsValid(lldb::addr_t pc) override {63 // We have a 64 bit address space, so anything is valid as opcodes64 // aren't fixed width...65 return true;66 }67 68 bool GetPointerReturnRegister(const char *&name) override;69 70 // Static Functions71 72 static void Initialize();73 74 static void Terminate();75 76 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);77 78 static llvm::StringRef GetPluginNameStatic() { return "sysv-x86_64"; }79 80 // PluginInterface protocol81 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }82 83protected:84 void CreateRegisterMapIfNeeded();85 86 lldb::ValueObjectSP87 GetReturnValueObjectSimple(lldb_private::Thread &thread,88 lldb_private::CompilerType &ast_type) const;89 90 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);91 uint32_t GetGenericNum(llvm::StringRef reg) override;92 93private:94 using ABIX86_64::ABIX86_64; // Call CreateInstance instead.95};96 97#endif // LLDB_SOURCE_PLUGINS_ABI_X86_ABISYSV_X86_64_H98