[lldb][AIX] Added base file for AIX Register Context (#144645)

This PR is in reference to porting LLDB on AIX.
Link to discussions on llvm discourse and github:

1. https://discourse.llvm.org/t/port-lldb-to-ibm-aix/80640
2. #101657
The complete changes for porting are present in this draft PR:
#102601

- Added skeleton for Registercontext file for AIX. (Later we will add
implementation respectively)

Author: HemangGadhavi

lldb/source/Plugins/Process/AIX/CMakeLists.txt

@@ -1,6 +1,7 @@
 add_lldb_library(lldbPluginProcessAIX
   NativeProcessAIX.cpp
   NativeThreadAIX.cpp
+  NativeRegisterContextAIX.cpp
 
   LINK_COMPONENTS
     Support

lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.cpp

@@ -0,0 +1,54 @@
+//===---- NativeRegisterContextAIX.cpp ------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "NativeRegisterContextAIX.h"
+#include "Plugins/Process/AIX/NativeProcessAIX.h"
+
+using namespace lldb_private;
+using namespace lldb_private::process_aix;
+
+lldb::ByteOrder NativeRegisterContextAIX::GetByteOrder() const {
+  return lldb::eByteOrderInvalid;
+}
+
+Status NativeRegisterContextAIX::ReadRegisterRaw(uint32_t reg_index,
+                                                 RegisterValue &reg_value) {
+  return Status("unimplemented");
+}
+
+Status
+NativeRegisterContextAIX::WriteRegisterRaw(uint32_t reg_index,
+                                           const RegisterValue &reg_value) {
+  return Status("unimplemented");
+}
+
+Status NativeRegisterContextAIX::ReadGPR() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::WriteGPR() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::ReadFPR() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::WriteFPR() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::ReadVMX() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::WriteVMX() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::ReadVSX() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::WriteVSX() { return Status("unimplemented"); }
+
+Status NativeRegisterContextAIX::ReadRegisterSet(void *buf, size_t buf_size,
+                                                 unsigned int regset) {
+  return Status("unimplemented");
+}
+
+Status NativeRegisterContextAIX::WriteRegisterSet(void *buf, size_t buf_size,
+                                                  unsigned int regset) {
+  return Status("unimplemented");
+}

lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.h

@@ -0,0 +1,62 @@
+//===---- NativeRegisterContextAIX.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_PROCESS_AIX_NATIVEREGISTERCONTEXTAIX_H
+#define LLDB_SOURCE_PLUGINS_PROCESS_AIX_NATIVEREGISTERCONTEXTAIX_H
+
+#include "Plugins/Process/Utility/NativeRegisterContextRegisterInfo.h"
+
+namespace lldb_private::process_aix {
+
+class NativeRegisterContextAIX
+    : public virtual NativeRegisterContextRegisterInfo {
+protected:
+  NativeRegisterContextAIX(NativeThreadProtocol &thread)
+      : NativeRegisterContextRegisterInfo(thread, nullptr) {}
+
+  lldb::ByteOrder GetByteOrder() const;
+
+  virtual Status ReadRegisterRaw(uint32_t reg_index, RegisterValue &reg_value);
+
+  virtual Status WriteRegisterRaw(uint32_t reg_index,
+                                  const RegisterValue &reg_value);
+
+  virtual Status ReadRegisterSet(void *buf, size_t buf_size,
+                                 unsigned int regset);
+
+  virtual Status WriteRegisterSet(void *buf, size_t buf_size,
+                                  unsigned int regset);
+
+  virtual Status ReadGPR();
+
+  virtual Status WriteGPR();
+
+  virtual Status ReadFPR();
+
+  virtual Status WriteFPR();
+
+  virtual Status ReadVMX();
+
+  virtual Status WriteVMX();
+
+  virtual Status ReadVSX();
+
+  virtual Status WriteVSX();
+
+  virtual void *GetGPRBuffer() = 0;
+
+  virtual size_t GetGPRSize() = 0;
+
+  virtual void *GetFPRBuffer() = 0;
+
+  virtual size_t GetFPRSize() = 0;
+};
+
+} // namespace lldb_private::process_aix
+
+#endif // #ifndef LLDB_SOURCE_PLUGINS_PROCESS_AIX_NATIVEREGISTERCONTEXTAIX_H