ABISysV_arm.h

Go to the documentation of this file.

//===-- ABISysV_arm.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 LLDB_SOURCE_PLUGINS_ABI_ARM_ABISYSV_ARM_H
#define LLDB_SOURCE_PLUGINS_ABI_ARM_ABISYSV_ARM_H
 
#include "lldb/Target/ABI.h"
#include "lldb/lldb-private.h"
 
class ABISysV_arm : public lldb_private::RegInfoBasedABI {
public:
  ~ABISysV_arm() override = default;
 
  size_t GetRedZoneSize() const override;
 
  bool PrepareTrivialCall(lldb_private::Thread &thread, lldb::addr_t sp,
                          lldb::addr_t func_addr, 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::Status
  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;
 
  bool CallFrameAddressIsValid(lldb::addr_t cfa) override {
    // Make sure the stack call frame addresses are 4 byte aligned
    if (cfa & (4ull - 1ull))
      return false; // Not 4 byte aligned
    if (cfa == 0)
      return false; // Zero is not a valid stack address
    return true;
  }
 
  bool CodeAddressIsValid(lldb::addr_t pc) override {
    // Just make sure the address is a valid 32 bit address. Bit zero
    // might be set due to Thumb function calls, so don't enforce 2 byte
    // alignment
    return pc <= UINT32_MAX;
  }
 
  lldb::addr_t FixCodeAddress(lldb::addr_t pc) override {
    // ARM uses bit zero to signify a code address is thumb, so we must
    // strip bit zero in any code addresses.
    return pc & ~(lldb::addr_t)1;
  }
 
  const lldb_private::RegisterInfo *
  GetRegisterInfoArray(uint32_t &count) override;
 
  bool IsArmHardFloat(lldb_private::Thread &thread) const;
 
  // Static Functions
 
  static void Initialize();
 
  static void Terminate();
 
  static lldb::ABISP CreateInstance(lldb::ProcessSP process_sp, const lldb_private::ArchSpec &arch);
 
  static llvm::StringRef GetPluginNameStatic() { return "SysV-arm"; }
 
  // PluginInterface protocol
 
  llvm::StringRef GetPluginName() override { return GetPluginNameStatic(); }
 
protected:
  lldb::ValueObjectSP
  GetReturnValueObjectImpl(lldb_private::Thread &thread,
                           lldb_private::CompilerType &ast_type) const override;
 
private:
  using lldb_private::RegInfoBasedABI::RegInfoBasedABI; // Call CreateInstance instead.
};
 
#endif // LLDB_SOURCE_PLUGINS_ABI_ARM_ABISYSV_ARM_H