[lldb][AIX] Added base file for AIX Register Context

[HemangGadhavi]

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. Extending LLDB to work on AIX #101657
   The complete changes for porting are present in this draft PR:
   Extending LLDB to work on AIX #102601

• Added skeleton for Registercontext file for AIX. (Later we will add implementation respectively)
  @labath @DhruvSrivastavaX @DavidSpickett

[llvmbot]

@llvm/pr-subscribers-lldb

Author: Hemang Gadhavi (HemangGadhavi)

Changes

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. Extending LLDB to work on AIX #101657
   The complete changes for porting are present in this draft PR:
   Extending LLDB to work on AIX #102601

• Added skeleton for Registercontext file for AIX. (Later we will add implementation respectively)
  @labath @DhruvSrivastavaX @DavidSpickett

---

Full diff: https://github.com/llvm/llvm-project/pull/144645.diff

3 Files Affected:

• (modified) lldb/source/Plugins/Process/AIX/CMakeLists.txt (+1)
• (added) lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.cpp (+66)
• (added) lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.h (+74)

diff --git a/lldb/source/Plugins/Process/AIX/CMakeLists.txt b/lldb/source/Plugins/Process/AIX/CMakeLists.txt
index 6b3151edbd1ef..3a6d9ec118e60 100644
--- a/lldb/source/Plugins/Process/AIX/CMakeLists.txt
+++ b/lldb/source/Plugins/Process/AIX/CMakeLists.txt
@@ -1,6 +1,7 @@
 add_lldb_library(lldbPluginProcessAIX
   NativeProcessAIX.cpp
   NativeThreadAIX.cpp
+  NativeRegisterContextAIX.cpp
 
   LINK_COMPONENTS
     Support
diff --git a/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.cpp b/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.cpp
new file mode 100644
index 0000000000000..0cb993110bf78
--- /dev/null
+++ b/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.cpp
@@ -0,0 +1,66 @@
+//===-- 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 m_thread.GetProcess().GetByteOrder();
+}
+
+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");
+}
+
+Status NativeRegisterContextAIX::DoReadRegisterValue(uint32_t offset,
+                                                     const char *reg_name,
+                                                     uint32_t size,
+                                                     RegisterValue &value) {
+  return Status("unimplemented");
+}
+
+Status NativeRegisterContextAIX::DoWriteRegisterValue(
+    uint32_t offset, const char *reg_name, const RegisterValue &value) {
+  return Status("unimplemented");
+}
diff --git a/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.h b/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.h
new file mode 100644
index 0000000000000..2a22c45ce008c
--- /dev/null
+++ b/lldb/source/Plugins/Process/AIX/NativeRegisterContextAIX.h
@@ -0,0 +1,74 @@
+//===-- 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_NativeRegisterContextAIX_h
+#define lldb_NativeRegisterContextAIX_h
+
+#include "Plugins/Process/Utility/NativeRegisterContextRegisterInfo.h"
+
+namespace lldb_private {
+namespace process_aix {
+
+class NativeThreadAIX;
+
+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;
+
+  // The Do*** functions are executed on the privileged thread and can perform
+  // ptrace operations directly.
+  virtual Status DoReadRegisterValue(uint32_t offset, const char *reg_name,
+                                     uint32_t size, RegisterValue &value);
+
+  virtual Status DoWriteRegisterValue(uint32_t offset, const char *reg_name,
+                                      const RegisterValue &value);
+};
+
+} // namespace process_aix
+} // namespace lldb_private
+
+#endif // #ifndef lldb_NativeRegisterContextAIX_h