https://github.com/AlexeyMerzlyakov updated 
https://github.com/llvm/llvm-project/pull/93297

>From d30c3b7017bd9f4b9f442ee728d7e3d7847c60cf Mon Sep 17 00:00:00 2001
From: Alexey Merzlyakov <alexey.merzlya...@samsung.com>
Date: Fri, 24 May 2024 11:54:16 +0300
Subject: [PATCH 1/3] Add RegisterContextPOSIXCore for RISC-V 64

Fix GetRegisterSetCount() method name misprint for RegisterContextPOSIX_riscv64
---
 .../Utility/RegisterContextPOSIX_riscv64.cpp  |  2 +-
 .../Plugins/Process/elf-core/CMakeLists.txt   |  1 +
 .../RegisterContextPOSIXCore_riscv64.cpp      | 84 +++++++++++++++++++
 .../RegisterContextPOSIXCore_riscv64.h        | 60 +++++++++++++
 .../Process/elf-core/ThreadElfCore.cpp        |  8 +-
 5 files changed, 153 insertions(+), 2 deletions(-)
 create mode 100644 
lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
 create mode 100644 
lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.h

diff --git 
a/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_riscv64.cpp 
b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_riscv64.cpp
index 1834a94dc0260..035ce00e11626 100644
--- a/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_riscv64.cpp
+++ b/lldb/source/Plugins/Process/Utility/RegisterContextPOSIX_riscv64.cpp
@@ -58,7 +58,7 @@ RegisterContextPOSIX_riscv64::GetRegisterInfoAtIndex(size_t 
reg) {
 }
 
 size_t RegisterContextPOSIX_riscv64::GetRegisterSetCount() {
-  return m_register_info_up->GetRegisterCount();
+  return m_register_info_up->GetRegisterSetCount();
 }
 
 const lldb_private::RegisterSet *
diff --git a/lldb/source/Plugins/Process/elf-core/CMakeLists.txt 
b/lldb/source/Plugins/Process/elf-core/CMakeLists.txt
index 8ddc671e3ae66..72925c835b5c8 100644
--- a/lldb/source/Plugins/Process/elf-core/CMakeLists.txt
+++ b/lldb/source/Plugins/Process/elf-core/CMakeLists.txt
@@ -9,6 +9,7 @@ add_lldb_library(lldbPluginProcessElfCore PLUGIN
   RegisterContextPOSIXCore_ppc64le.cpp
   RegisterContextPOSIXCore_s390x.cpp
   RegisterContextPOSIXCore_x86_64.cpp
+  RegisterContextPOSIXCore_riscv64.cpp
   RegisterUtilities.cpp
 
   LINK_LIBS
diff --git 
a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp 
b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
new file mode 100644
index 0000000000000..2202be4d38082
--- /dev/null
+++ b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
@@ -0,0 +1,84 @@
+//===-- RegisterContextPOSIXCore_riscv64.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 "RegisterContextPOSIXCore_riscv64.h"
+
+#include "lldb/Utility/DataBufferHeap.h"
+
+using namespace lldb_private;
+
+std::unique_ptr<RegisterContextCorePOSIX_riscv64>
+RegisterContextCorePOSIX_riscv64::Create(
+    lldb_private::Thread &thread, const lldb_private::ArchSpec &arch,
+    const lldb_private::DataExtractor &gpregset,
+    llvm::ArrayRef<lldb_private::CoreNote> notes) {
+  Flags flags = 0;
+
+  auto register_info_up =
+      std::make_unique<RegisterInfoPOSIX_riscv64>(arch, flags);
+  return std::unique_ptr<RegisterContextCorePOSIX_riscv64>(
+      new RegisterContextCorePOSIX_riscv64(thread, std::move(register_info_up),
+                                           gpregset, notes));
+}
+
+RegisterContextCorePOSIX_riscv64::RegisterContextCorePOSIX_riscv64(
+    Thread &thread, std::unique_ptr<RegisterInfoPOSIX_riscv64> register_info,
+    const DataExtractor &gpregset, llvm::ArrayRef<CoreNote> notes)
+    : RegisterContextPOSIX_riscv64(thread, std::move(register_info)) {
+
+  m_gpr_buffer = std::make_shared<DataBufferHeap>(gpregset.GetDataStart(),
+                                                  gpregset.GetByteSize());
+  m_gpr.SetData(m_gpr_buffer);
+  m_gpr.SetByteOrder(gpregset.GetByteOrder());
+
+  ArchSpec arch = m_register_info_up->GetTargetArchitecture();
+  DataExtractor fpregset = getRegset(notes, arch.GetTriple(), FPR_Desc);
+  m_fpr_buffer = std::make_shared<DataBufferHeap>(fpregset.GetDataStart(),
+                                                  fpregset.GetByteSize());
+  m_fpr.SetData(m_fpr_buffer);
+  m_fpr.SetByteOrder(fpregset.GetByteOrder());
+}
+
+RegisterContextCorePOSIX_riscv64::~RegisterContextCorePOSIX_riscv64() = 
default;
+
+bool RegisterContextCorePOSIX_riscv64::ReadGPR() { return true; }
+
+bool RegisterContextCorePOSIX_riscv64::ReadFPR() { return true; }
+
+bool RegisterContextCorePOSIX_riscv64::WriteGPR() {
+  assert(0);
+  return false;
+}
+
+bool RegisterContextCorePOSIX_riscv64::WriteFPR() {
+  assert(0);
+  return false;
+}
+
+bool RegisterContextCorePOSIX_riscv64::ReadRegister(
+    const RegisterInfo *reg_info, RegisterValue &value) {
+  const uint8_t *src = nullptr;
+  lldb::offset_t offset = reg_info->byte_offset;
+
+  if (IsGPR(reg_info->kinds[lldb::eRegisterKindLLDB])) {
+    src = m_gpr.GetDataStart();
+  } else { // IsFPR
+    src = m_fpr.GetDataStart();
+    offset -= GetGPRSize();
+  }
+
+  Status error;
+  value.SetFromMemoryData(*reg_info, src + offset, reg_info->byte_size,
+                          lldb::eByteOrderLittle, error);
+  return error.Success();
+}
+
+bool RegisterContextCorePOSIX_riscv64::WriteRegister(
+    const RegisterInfo *reg_info, const RegisterValue &value) {
+  return false;
+}
diff --git 
a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.h 
b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.h
new file mode 100644
index 0000000000000..3cf9531df2c1d
--- /dev/null
+++ b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.h
@@ -0,0 +1,60 @@
+//===-- RegisterContextPOSIXCore_riscv64.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_ELF_CORE_REGISTERCONTEXTPOSIXCORE_RISCV64_H
+#define LLDB_SOURCE_PLUGINS_PROCESS_ELF_CORE_REGISTERCONTEXTPOSIXCORE_RISCV64_H
+
+#include "Plugins/Process/Utility/RegisterContextPOSIX_riscv64.h"
+#include "Plugins/Process/Utility/RegisterInfoPOSIX_riscv64.h"
+
+#include "Plugins/Process/elf-core/RegisterUtilities.h"
+#include "lldb/Target/Thread.h"
+#include "lldb/Utility/DataExtractor.h"
+#include "lldb/Utility/RegisterValue.h"
+
+#include <memory>
+
+class RegisterContextCorePOSIX_riscv64 : public RegisterContextPOSIX_riscv64 {
+public:
+  static std::unique_ptr<RegisterContextCorePOSIX_riscv64>
+  Create(lldb_private::Thread &thread, const lldb_private::ArchSpec &arch,
+         const lldb_private::DataExtractor &gpregset,
+         llvm::ArrayRef<lldb_private::CoreNote> notes);
+
+  ~RegisterContextCorePOSIX_riscv64() override;
+
+  bool ReadRegister(const lldb_private::RegisterInfo *reg_info,
+                    lldb_private::RegisterValue &value) override;
+
+  bool WriteRegister(const lldb_private::RegisterInfo *reg_info,
+                     const lldb_private::RegisterValue &value) override;
+
+protected:
+  RegisterContextCorePOSIX_riscv64(
+      lldb_private::Thread &thread,
+      std::unique_ptr<RegisterInfoPOSIX_riscv64> register_info,
+      const lldb_private::DataExtractor &gpregset,
+      llvm::ArrayRef<lldb_private::CoreNote> notes);
+
+  bool ReadGPR() override;
+
+  bool ReadFPR() override;
+
+  bool WriteGPR() override;
+
+  bool WriteFPR() override;
+
+private:
+  lldb::DataBufferSP m_gpr_buffer;
+  lldb::DataBufferSP m_fpr_buffer;
+
+  lldb_private::DataExtractor m_gpr;
+  lldb_private::DataExtractor m_fpr;
+};
+
+#endif // 
LLDB_SOURCE_PLUGINS_PROCESS_ELF_CORE_REGISTERCONTEXTPOSIXCORE_RISCV64_H
diff --git a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp 
b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
index 3ce2a4a5c3fa4..2a83163884e16 100644
--- a/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
+++ b/lldb/source/Plugins/Process/elf-core/ThreadElfCore.cpp
@@ -35,6 +35,7 @@
 #include "RegisterContextPOSIXCore_mips64.h"
 #include "RegisterContextPOSIXCore_powerpc.h"
 #include "RegisterContextPOSIXCore_ppc64le.h"
+#include "RegisterContextPOSIXCore_riscv64.h"
 #include "RegisterContextPOSIXCore_s390x.h"
 #include "RegisterContextPOSIXCore_x86_64.h"
 #include "ThreadElfCore.h"
@@ -168,7 +169,8 @@ ThreadElfCore::CreateRegisterContextForFrame(StackFrame 
*frame) {
     }
 
     if (!reg_interface && arch.GetMachine() != llvm::Triple::aarch64 &&
-        arch.GetMachine() != llvm::Triple::arm) {
+        arch.GetMachine() != llvm::Triple::arm &&
+        arch.GetMachine() != llvm::Triple::riscv64) {
       LLDB_LOGF(log, "elf-core::%s:: Architecture(%d) or OS(%d) not supported",
                 __FUNCTION__, arch.GetMachine(), arch.GetTriple().getOS());
       assert(false && "Architecture or OS not supported");
@@ -184,6 +186,10 @@ ThreadElfCore::CreateRegisterContextForFrame(StackFrame 
*frame) {
           *this, std::make_unique<RegisterInfoPOSIX_arm>(arch), 
m_gpregset_data,
           m_notes);
       break;
+    case llvm::Triple::riscv64:
+      m_thread_reg_ctx_sp = RegisterContextCorePOSIX_riscv64::Create(
+          *this, arch, m_gpregset_data, m_notes);
+      break;
     case llvm::Triple::mipsel:
     case llvm::Triple::mips:
       m_thread_reg_ctx_sp = std::make_shared<RegisterContextCorePOSIX_mips64>(

>From 7239f6293ee088a7cde8fa2e6feee00aedf7ac9a Mon Sep 17 00:00:00 2001
From: Alexey Merzlyakov <alexey.merzlya...@samsung.com>
Date: Wed, 29 May 2024 12:29:38 +0300
Subject: [PATCH 2/3] Meet review items

---
 .../RegisterContextPOSIXCore_riscv64.cpp      | 22 +++++++++----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git 
a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp 
b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
index 2202be4d38082..6f188a9fad5ed 100644
--- a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
+++ b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
@@ -13,17 +13,15 @@
 using namespace lldb_private;
 
 std::unique_ptr<RegisterContextCorePOSIX_riscv64>
-RegisterContextCorePOSIX_riscv64::Create(
-    lldb_private::Thread &thread, const lldb_private::ArchSpec &arch,
-    const lldb_private::DataExtractor &gpregset,
-    llvm::ArrayRef<lldb_private::CoreNote> notes) {
+RegisterContextCorePOSIX_riscv64::Create(Thread &thread, const ArchSpec &arch,
+                                         const DataExtractor &gpregset,
+                                         llvm::ArrayRef<CoreNote> notes) {
   Flags flags = 0;
 
-  auto register_info_up =
-      std::make_unique<RegisterInfoPOSIX_riscv64>(arch, flags);
   return std::unique_ptr<RegisterContextCorePOSIX_riscv64>(
-      new RegisterContextCorePOSIX_riscv64(thread, std::move(register_info_up),
-                                           gpregset, notes));
+      new RegisterContextCorePOSIX_riscv64(
+          thread, std::make_unique<RegisterInfoPOSIX_riscv64>(arch, flags),
+          gpregset, notes));
 }
 
 RegisterContextCorePOSIX_riscv64::RegisterContextCorePOSIX_riscv64(
@@ -51,12 +49,12 @@ bool RegisterContextCorePOSIX_riscv64::ReadGPR() { return 
true; }
 bool RegisterContextCorePOSIX_riscv64::ReadFPR() { return true; }
 
 bool RegisterContextCorePOSIX_riscv64::WriteGPR() {
-  assert(0);
+  assert(false && "Writing registers is not allowed for core dumps");
   return false;
 }
 
 bool RegisterContextCorePOSIX_riscv64::WriteFPR() {
-  assert(0);
+  assert(false && "Writing registers is not allowed for core dumps");
   return false;
 }
 
@@ -67,9 +65,11 @@ bool RegisterContextCorePOSIX_riscv64::ReadRegister(
 
   if (IsGPR(reg_info->kinds[lldb::eRegisterKindLLDB])) {
     src = m_gpr.GetDataStart();
-  } else { // IsFPR
+  } else if (IsFPR(reg_info->kinds[lldb::eRegisterKindLLDB])) {
     src = m_fpr.GetDataStart();
     offset -= GetGPRSize();
+  } else {
+    return false;
   }
 
   Status error;

>From 071886e99f4cc758789fab1701770a54bd240149 Mon Sep 17 00:00:00 2001
From: Alexey Merzlyakov <alexey.merzlya...@samsung.com>
Date: Tue, 4 Jun 2024 14:51:32 +0300
Subject: [PATCH 3/3] Optimize flags initialization

Add RISC-V 64 testcases to TestLinuxCore.py
---
 .../RegisterContextPOSIXCore_riscv64.cpp      |   4 +-
 .../postmortem/elf-core/TestLinuxCore.py      |  57 ++++++++++++++++++
 .../postmortem/elf-core/linux-riscv64.core    | Bin 0 -> 24576 bytes
 .../postmortem/elf-core/linux-riscv64.out     | Bin 0 -> 3328 bytes
 4 files changed, 58 insertions(+), 3 deletions(-)
 create mode 100644 
lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.core
 create mode 100755 
lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.out

diff --git 
a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp 
b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
index 6f188a9fad5ed..5ba18cdb9889a 100644
--- a/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
+++ b/lldb/source/Plugins/Process/elf-core/RegisterContextPOSIXCore_riscv64.cpp
@@ -16,11 +16,9 @@ std::unique_ptr<RegisterContextCorePOSIX_riscv64>
 RegisterContextCorePOSIX_riscv64::Create(Thread &thread, const ArchSpec &arch,
                                          const DataExtractor &gpregset,
                                          llvm::ArrayRef<CoreNote> notes) {
-  Flags flags = 0;
-
   return std::unique_ptr<RegisterContextCorePOSIX_riscv64>(
       new RegisterContextCorePOSIX_riscv64(
-          thread, std::make_unique<RegisterInfoPOSIX_riscv64>(arch, flags),
+          thread, std::make_unique<RegisterInfoPOSIX_riscv64>(arch, Flags()),
           gpregset, notes));
 }
 
diff --git a/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py 
b/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
index 8ec0cbdd0fdd1..24d17a814a775 100644
--- a/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
+++ b/lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py
@@ -21,12 +21,14 @@ class LinuxCoreTestCase(TestBase):
     _x86_64_pid = 32259
     _s390x_pid = 1045
     _ppc64le_pid = 28147
+    _riscv64_pid = 87015
 
     _aarch64_regions = 4
     _i386_regions = 4
     _x86_64_regions = 5
     _s390x_regions = 2
     _ppc64le_regions = 2
+    _riscv64_regions = 4
 
     @skipIfLLVMTargetMissing("AArch64")
     def test_aarch64(self):
@@ -58,6 +60,11 @@ def test_s390x(self):
         """Test that lldb can read the process information from an s390x linux 
core file."""
         self.do_test("linux-s390x", self._s390x_pid, self._s390x_regions, 
"a.out")
 
+    @skipIfLLVMTargetMissing("RISCV")
+    def test_riscv64(self):
+        """Test that lldb can read the process information from an riscv64 
linux core file."""
+        self.do_test("linux-riscv64", self._riscv64_pid, 
self._riscv64_regions, "a.out")
+
     @skipIfLLVMTargetMissing("X86")
     def test_same_pid_running(self):
         """Test that we read the information from the core correctly even if 
we have a running
@@ -629,6 +636,56 @@ def test_arm_core(self):
 
         self.expect("register read --all")
 
+    @skipIfLLVMTargetMissing("RISCV")
+    def test_riscv64_regs(self):
+        # check basic registers using 64 bit RISC-V core file
+        target = self.dbg.CreateTarget(None)
+        self.assertTrue(target, VALID_TARGET)
+        process = target.LoadCore("linux-riscv64.core")
+
+        values = {}
+        values["pc"] = "0x000000000001015e"
+        values["ra"] = "0x000000000001018c"
+        values["sp"] = "0x0000003fffb3e2a0"
+        values["gp"] = "0x0000002ad7ff1f50"
+        values["tp"] = "0x0000003fd11433e0"
+        values["t0"] = "0x0"
+        values["t1"] = "0x0000002ad7fdeb1c"
+        values["t2"] = "0x0000000000000021"
+        values["fp"] = "0x0000003fffb3e2d0"
+        values["s1"] = "0x0000002ad7ff3d98"
+        values["a0"] = "0x0"
+        values["a1"] = "0x0000000000010144"
+        values["a2"] = "0x0000002ad7ff3db0"
+        values["a3"] = "0x000000000000002f"
+        values["a4"] = "0x000000000000002f"
+        values["a5"] = "0x0"
+        values["a6"] = "0x7efefefefefefeff"
+        values["a7"] = "0x00000000000000dd"
+        values["s2"] = "0x0000002ad7fed860"
+        values["s3"] = "0x0000002ad7ff3db0"
+        values["s4"] = "0x0000003fff889be8"
+        values["s5"] = "0x0000002ad7ff3b78"
+        values["s6"] = "0x0000002ad7fed860"
+        values["s7"] = "0x0000002ad7fed860"
+        values["s8"] = "0x0"
+        values["s9"] = "0x000000000000000f"
+        values["s10"] = "0x0000002ad7ff18d0"
+        values["s11"] = "0x0000000000000008"
+        values["t3"] = "0x0000003fd109cdf4"
+        values["t4"] = "0x0"
+        values["t5"] = "0x0000000000000020"
+        values["t6"] = "0x0000002ad7ff61b0"
+        values["zero"] = "0x0"
+
+        for regname, value in values.items():
+            self.expect(
+                "register read {}".format(regname),
+                substrs=["{} = {}".format(regname, value)],
+            )
+
+        self.expect("register read --all")
+
     def test_get_core_file_api(self):
         """
         Test SBProcess::GetCoreFile() API can successfully get the core file.
diff --git 
a/lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.core 
b/lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.core
new file mode 100644
index 
0000000000000000000000000000000000000000..84b352402e8ca8468a55465360578db2f15f7fd0
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literal 0
HcmV?d00001

diff --git 
a/lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.out 
b/lldb/test/API/functionalities/postmortem/elf-core/linux-riscv64.out
new file mode 100755
index 
0000000000000000000000000000000000000000..ae28aa9ba9aad9700b193281fa8045587c344187
GIT binary patch
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literal 0
HcmV?d00001


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