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1//===-- ABISysV_arm64.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_AARCH64_ABISYSV_ARM64_H10#define LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABISYSV_ARM64_H11 12#include "Plugins/ABI/AArch64/ABIAArch64.h"13#include "lldb/lldb-private.h"14 15class ABISysV_arm64 : public ABIAArch64 {16public:17 ~ABISysV_arm64() 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 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;34 35 // The arm64 ABI requires that stack frames be 16 byte aligned.36 // When there is a trap handler on the stack, e.g. _sigtramp in userland37 // code, we've seen that the stack pointer is often not aligned properly38 // before the handler is invoked. This means that lldb will stop the unwind39 // early -- before the function which caused the trap.40 //41 // To work around this, we relax that alignment to be just word-size42 // (8-bytes).43 // Allowing the trap handlers for user space would be easy (_sigtramp) but44 // in other environments there can be a large number of different functions45 // involved in async traps.46 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {47 // Make sure the stack call frame addresses are 8 byte aligned48 if (cfa & (8ull - 1ull))49 return false; // Not 8 byte aligned50 if (cfa == 0)51 return false; // Zero is not a valid stack address52 return true;53 }54 55 bool CodeAddressIsValid(lldb::addr_t pc) override {56 if (pc & (4ull - 1ull))57 return false; // Not 4 byte aligned58 59 // Anything else if fair game..60 return true;61 }62 63 bool GetPointerReturnRegister(const char *&name) override;64 65 lldb::addr_t FixAddress(lldb::addr_t pc, lldb::addr_t mask) override;66 67 // Static Functions68 69 static void Initialize();70 71 static void Terminate();72 73 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);74 75 static llvm::StringRef GetPluginNameStatic() { return "SysV-arm64"; }76 77 // PluginInterface protocol78 79 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }80 81 lldb::addr_t FixCodeAddress(lldb::addr_t pc) override;82 lldb::addr_t FixDataAddress(lldb::addr_t pc) override;83 84protected:85 lldb::ValueObjectSP86 GetReturnValueObjectImpl(lldb_private::Thread &thread,87 lldb_private::CompilerType &ast_type) const override;88 89private:90 using ABIAArch64::ABIAArch64; // Call CreateInstance instead.91};92 93#endif // LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABISYSV_ARM64_H94