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1//===-- ABISysV_mips64.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_MIPS_ABISYSV_MIPS64_H10#define LLDB_SOURCE_PLUGINS_ABI_MIPS_ABISYSV_MIPS64_H11 12#include "lldb/Target/ABI.h"13#include "lldb/lldb-private.h"14 15class ABISysV_mips64 : public lldb_private::RegInfoBasedABI {16public:17 ~ABISysV_mips64() override = default;18 19 size_t GetRedZoneSize() const override;20 21 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,22 lldb::addr_t functionAddress,23 lldb::addr_t returnAddress,24 llvm::ArrayRef<lldb::addr_t> args) const override;25 26 bool GetArgumentValues(lldb_private::Thread &thread,27 lldb_private::ValueList &values) const override;28 29 lldb_private::Status30 SetReturnValueObject(lldb::StackFrameSP &frame_sp,31 lldb::ValueObjectSP &new_value) override;32 33 lldb::ValueObjectSP34 GetReturnValueObjectImpl(lldb_private::Thread &thread,35 lldb_private::CompilerType &type) const override;36 37 lldb::UnwindPlanSP CreateFunctionEntryUnwindPlan() override;38 39 lldb::UnwindPlanSP CreateDefaultUnwindPlan() override;40 41 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;42 43 bool IsSoftFloat(uint32_t fp_flag) const;44 45 // The SysV mips ABI requires that stack frames be 16 byte aligned.46 // When there is a trap handler on the stack, e.g. _sigtramp in userland47 // code, we've seen that the stack pointer is often not aligned properly48 // before the handler is invoked. This means that lldb will stop the unwind49 // early -- before the function which caused the trap.50 //51 // To work around this, we relax that alignment to be just word-size52 // (8-bytes).53 // Allowing the trap handlers for user space would be easy (_sigtramp) but54 // in other environments there can be a large number of different functions55 // involved in async traps.56 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {57 // Make sure the stack call frame addresses are 8 byte aligned58 if (cfa & (8ull - 1ull))59 return false; // Not 8 byte aligned60 if (cfa == 0)61 return false; // Zero is not a valid stack address62 return true;63 }64 65 bool CodeAddressIsValid(lldb::addr_t pc) override {66 if (pc & (4ull - 1ull))67 return false; // Not 4 byte aligned68 69 // Anything else if fair game..70 return true;71 }72 73 const lldb_private::RegisterInfo *74 GetRegisterInfoArray(uint32_t &count) override;75 76 // Static Functions77 78 static void Initialize();79 80 static void Terminate();81 82 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);83 84 static llvm::StringRef GetPluginNameStatic() { return "sysv-mips64"; }85 86 // PluginInterface protocol87 88 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }89 90protected:91 void CreateRegisterMapIfNeeded();92 93 lldb::ValueObjectSP94 GetReturnValueObjectSimple(lldb_private::Thread &thread,95 lldb_private::CompilerType &ast_type) const;96 97 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);98 99private:100 using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead.101};102 103#endif // LLDB_SOURCE_PLUGINS_ABI_MIPS_ABISYSV_MIPS64_H104