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//===-- ABISysV_arm64.h ---------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_ABISysV_arm64_h_
#define liblldb_ABISysV_arm64_h_
// C Includes
// C++ Includes
// Other libraries and framework includes
// Project includes
#include "lldb/lldb-private.h"
#include "lldb/Target/ABI.h"
class ABISysV_arm64 : public lldb_private::ABI
{
public:
~ABISysV_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;
lldb_private::Error
SetReturnValueObject(lldb::StackFrameSP &frame_sp, lldb::ValueObjectSP &new_value) 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 (const lldb_private::ArchSpec &arch);
static lldb_private::ConstString
GetPluginNameStatic();
//------------------------------------------------------------------
// PluginInterface protocol
//------------------------------------------------------------------
lldb_private::ConstString
GetPluginName() override;
uint32_t
GetPluginVersion() override;
protected:
lldb::ValueObjectSP
GetReturnValueObjectImpl(lldb_private::Thread &thread,
lldb_private::CompilerType &ast_type) const override;
private:
ABISysV_arm64() :
lldb_private::ABI()
{
// Call CreateInstance instead.
}
};
#endif // liblldb_ABISysV_arm64_h_
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