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1//===-- ABISysV_ppc.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_POWERPC_ABISYSV_PPC_H10#define LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC_H11 12#include "lldb/Target/ABI.h"13#include "lldb/lldb-private.h"14 15class ABISysV_ppc : public lldb_private::RegInfoBasedABI {16public:17 ~ABISysV_ppc() 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 // The SysV ppc ABI requires that stack frames be 16 byte aligned.44 // When there is a trap handler on the stack, e.g. _sigtramp in userland45 // code, we've seen that the stack pointer is often not aligned properly46 // before the handler is invoked. This means that lldb will stop the unwind47 // early -- before the function which caused the trap.48 //49 // To work around this, we relax that alignment to be just word-size50 // (8-bytes).51 // Allowing the trap handlers for user space would be easy (_sigtramp) but52 // in other environments there can be a large number of different functions53 // involved in async traps.54 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {55 // Make sure the stack call frame addresses are 8 byte aligned56 if (cfa & (8ull - 1ull))57 return false; // Not 8 byte aligned58 if (cfa == 0)59 return false; // Zero is not a valid stack address60 return true;61 }62 63 bool CodeAddressIsValid(lldb::addr_t pc) override {64 // We have a 64 bit address space, so anything is valid as opcodes65 // aren't fixed width...66 return true;67 }68 69 const lldb_private::RegisterInfo *70 GetRegisterInfoArray(uint32_t &count) override;71 72 // Static Functions73 74 static void Initialize();75 76 static void Terminate();77 78 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);79 80 static llvm::StringRef GetPluginNameStatic() { return "sysv-ppc"; }81 82 // PluginInterface protocol83 84 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }85 86protected:87 void CreateRegisterMapIfNeeded();88 89 lldb::ValueObjectSP90 GetReturnValueObjectSimple(lldb_private::Thread &thread,91 lldb_private::CompilerType &ast_type) const;92 93 bool RegisterIsCalleeSaved(const lldb_private::RegisterInfo *reg_info);94 95private:96 using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead.97};98 99#endif // LLDB_SOURCE_PLUGINS_ABI_POWERPC_ABISYSV_PPC_H100