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| //===-- ABIMacOSX_arm64.h ---------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ABIMacOSX_arm64_h_
#define liblldb_ABIMacOSX_arm64_h_
#include "lldb/Target/ABI.h"
#include "lldb/Utility/ConstString.h"
#include "lldb/lldb-private.h"
class ABIMacOSX_arm64 : public lldb_private::ABI {
public:
~ABIMacOSX_arm64() override = default;
size_t GetRedZoneSize() const override;
bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
lldb::addr_t functionAddress,
lldb::addr_t returnAddress,
llvm::ArrayRef<lldb::addr_t> args) const override;
bool GetArgumentValues(lldb_private::Thread &thread,
lldb_private::ValueList &values) const override;
bool
CreateFunctionEntryUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
bool CreateDefaultUnwindPlan(lldb_private::UnwindPlan &unwind_plan) override;
bool RegisterIsVolatile(const lldb_private::RegisterInfo *reg_info) override;
// The arm64 ABI requires that stack frames be 16 byte aligned.
// When there is a trap handler on the stack, e.g. _sigtramp in userland
// code, we've seen that the stack pointer is often not aligned properly
// before the handler is invoked. This means that lldb will stop the unwind
// early -- before the function which caused the trap.
//
// To work around this, we relax that alignment to be just word-size
// (8-bytes).
// Whitelisting the trap handlers for user space would be easy (_sigtramp) but
// in other environments there can be a large number of different functions
// involved in async traps.
bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
// Make sure the stack call frame addresses are are 8 byte aligned
if (cfa & (8ull - 1ull))
return false; // Not 8 byte aligned
if (cfa == 0)
return false; // Zero is not a valid stack address
return true;
}
bool CodeAddressIsValid(lldb::addr_t pc) override {
if (pc & (4ull - 1ull))
return false; // Not 4 byte aligned
// Anything else if fair game..
return true;
}
const lldb_private::RegisterInfo *
GetRegisterInfoArray(uint32_t &count) override;
// Static Functions
static void Initialize();
static void Terminate();
static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
// PluginInterface protocol
static lldb_private::ConstString GetPluginNameStatic();
lldb_private::ConstString GetPluginName() override {
return GetPluginNameStatic();
}
uint32_t GetPluginVersion() override;
lldb_private::Status
SetReturnValueObject(lldb::StackFrameSP &frame_sp,
lldb::ValueObjectSP &new_value) override;
protected:
lldb::ValueObjectSP
GetReturnValueObjectImpl(lldb_private::Thread &thread,
lldb_private::CompilerType &ast_type) const override;
private:
ABIMacOSX_arm64(lldb::ProcessSP process_sp,
std::unique_ptr<llvm::MCRegisterInfo> info_up)
: lldb_private::ABI(std::move(process_sp), std::move(info_up)) {
// Call CreateInstance instead.
}
};
#endif // liblldb_ABIMacOSX_arm64_h_
|