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1//===-- ABIMacOSX_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_ABIMACOSX_ARM64_H10#define LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABIMACOSX_ARM64_H11 12#include "Plugins/ABI/AArch64/ABIAArch64.h"13#include "lldb/Utility/ConstString.h"14#include "lldb/lldb-private.h"15 16class ABIMacOSX_arm64 : public ABIAArch64 {17public:18 ~ABIMacOSX_arm64() override = default;19 20 size_t GetRedZoneSize() const override;21 22 bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,23 lldb::addr_t functionAddress,24 lldb::addr_t returnAddress,25 llvm::ArrayRef<lldb::addr_t> args) const override;26 27 bool GetArgumentValues(lldb_private::Thread &thread,28 lldb_private::ValueList &values) const override;29 30 bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;31 32 // The arm64 ABI requires that stack frames be 16 byte aligned.33 // When there is a trap handler on the stack, e.g. _sigtramp in userland34 // code, we've seen that the stack pointer is often not aligned properly35 // before the handler is invoked. This means that lldb will stop the unwind36 // early -- before the function which caused the trap.37 //38 // To work around this, we relax that alignment to be just word-size39 // (8-bytes).40 // Allowing the trap handlers for user space would be easy (_sigtramp) but41 // in other environments there can be a large number of different functions42 // involved in async traps.43 bool CallFrameAddressIsValid(lldb::addr_t cfa) override {44 // Make sure the stack call frame addresses are 8 byte aligned45 if (cfa & (8ull - 1ull))46 return false; // Not 8 byte aligned47 if (cfa == 0)48 return false; // Zero is not a valid stack address49 return true;50 }51 52 bool CodeAddressIsValid(lldb::addr_t pc) override {53 if (pc & (4ull - 1ull))54 return false; // Not 4 byte aligned55 56 // Anything else if fair game..57 return true;58 }59 60 lldb::addr_t FixCodeAddress(lldb::addr_t pc) override;61 lldb::addr_t FixDataAddress(lldb::addr_t pc) override;62 63 // Static Functions64 65 static void Initialize();66 67 static void Terminate();68 69 static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);70 71 // PluginInterface protocol72 73 static llvm::StringRef GetPluginNameStatic() { return "ABIMacOSX_arm64"; }74 75 llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }76 77 lldb_private::Status78 SetReturnValueObject(lldb::StackFrameSP &frame_sp,79 lldb::ValueObjectSP &new_value) override;80 81protected:82 lldb::ValueObjectSP83 GetReturnValueObjectImpl(lldb_private::Thread &thread,84 lldb_private::CompilerType &ast_type) const override;85 86private:87 using ABIAArch64::ABIAArch64; // Call CreateInstance instead.88};89 90#endif // LLDB_SOURCE_PLUGINS_ABI_AARCH64_ABIMACOSX_ARM64_H91