diff --git a/llvm/include/llvm/BinaryFormat/MinidumpConstants.def b/llvm/include/llvm/BinaryFormat/MinidumpConstants.def
--- a/llvm/include/llvm/BinaryFormat/MinidumpConstants.def
+++ b/llvm/include/llvm/BinaryFormat/MinidumpConstants.def
@@ -115,6 +115,7 @@
 HANDLE_MDMP_PLATFORM(0x8203, Android) // Android
 HANDLE_MDMP_PLATFORM(0x8204, PS3) // PS3
 HANDLE_MDMP_PLATFORM(0x8205, NaCl) // Native Client (NaCl)
+HANDLE_MDMP_PLATFORM(0x8206, OpenHOS) // OpenHarmony OS
 
 HANDLE_MDMP_PROTECT(0x01, NoAccess, PAGE_NO_ACCESS)
 HANDLE_MDMP_PROTECT(0x02, ReadOnly, PAGE_READ_ONLY)
diff --git a/llvm/include/llvm/TargetParser/Triple.h b/llvm/include/llvm/TargetParser/Triple.h
--- a/llvm/include/llvm/TargetParser/Triple.h
+++ b/llvm/include/llvm/TargetParser/Triple.h
@@ -223,7 +223,8 @@
     WASI,       // Experimental WebAssembly OS
     Emscripten,
     ShaderModel, // DirectX ShaderModel
-    LastOSType = ShaderModel
+    LiteOS,
+    LastOSType = LiteOS
   };
   enum EnvironmentType {
     UnknownEnvironment,
@@ -273,8 +274,8 @@
     Callable,
     Mesh,
     Amplification,
-
-    LastEnvironmentType = Amplification
+    OpenHOS,
+    LastEnvironmentType = OpenHOS
   };
   enum ObjectFormatType {
     UnknownObjectFormat,
@@ -740,9 +741,18 @@
     return getEnvironment() == Triple::Musl ||
            getEnvironment() == Triple::MuslEABI ||
            getEnvironment() == Triple::MuslEABIHF ||
-           getEnvironment() == Triple::MuslX32;
+           getEnvironment() == Triple::MuslX32 ||
+           getEnvironment() == Triple::OpenHOS || isOSLiteOS();
   }
 
+  /// Tests whether the target is OHOS
+  /// LiteOS default enviroment is also OHOS, but omited on triple.
+  bool isOHOSFamily() const { return isOpenHOS() || isOSLiteOS(); }
+
+  bool isOpenHOS() const { return getEnvironment() == Triple::OpenHOS; }
+
+  bool isOSLiteOS() const { return getOS() == Triple::LiteOS; }
+
   /// Tests whether the target is DXIL.
   bool isDXIL() const {
     return getArch() == Triple::dxil;
@@ -789,6 +799,7 @@
             getEnvironment() == Triple::MuslEABI ||
             getEnvironment() == Triple::EABIHF ||
             getEnvironment() == Triple::GNUEABIHF ||
+            getEnvironment() == Triple::OpenHOS ||
             getEnvironment() == Triple::MuslEABIHF || isAndroid()) &&
            isOSBinFormatELF();
   }
diff --git a/llvm/lib/Target/ARM/ARMSubtarget.h b/llvm/lib/Target/ARM/ARMSubtarget.h
--- a/llvm/lib/Target/ARM/ARMSubtarget.h
+++ b/llvm/lib/Target/ARM/ARMSubtarget.h
@@ -391,7 +391,8 @@
   }
   bool isTargetMuslAEABI() const {
     return (TargetTriple.getEnvironment() == Triple::MuslEABI ||
-            TargetTriple.getEnvironment() == Triple::MuslEABIHF) &&
+            TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
+            TargetTriple.getEnvironment() == Triple::OpenHOS) &&
            !isTargetDarwin() && !isTargetWindows();
   }
 
diff --git a/llvm/lib/Target/ARM/ARMTargetMachine.cpp b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
--- a/llvm/lib/Target/ARM/ARMTargetMachine.cpp
+++ b/llvm/lib/Target/ARM/ARMTargetMachine.cpp
@@ -242,7 +242,8 @@
     if ((TargetTriple.getEnvironment() == Triple::GNUEABI ||
          TargetTriple.getEnvironment() == Triple::GNUEABIHF ||
          TargetTriple.getEnvironment() == Triple::MuslEABI ||
-         TargetTriple.getEnvironment() == Triple::MuslEABIHF) &&
+         TargetTriple.getEnvironment() == Triple::MuslEABIHF ||
+         TargetTriple.getEnvironment() == Triple::OpenHOS) &&
         !(TargetTriple.isOSWindows() || TargetTriple.isOSDarwin()))
       this->Options.EABIVersion = EABI::GNU;
     else
diff --git a/llvm/lib/TargetParser/AArch64TargetParser.cpp b/llvm/lib/TargetParser/AArch64TargetParser.cpp
--- a/llvm/lib/TargetParser/AArch64TargetParser.cpp
+++ b/llvm/lib/TargetParser/AArch64TargetParser.cpp
@@ -97,7 +97,7 @@
 
 bool AArch64::isX18ReservedByDefault(const Triple &TT) {
   return TT.isAndroid() || TT.isOSDarwin() || TT.isOSFuchsia() ||
-         TT.isOSWindows();
+         TT.isOSWindows() || TT.isOHOSFamily();
 }
 
 // Allows partial match, ex. "v8a" matches "armv8a".
diff --git a/llvm/lib/TargetParser/ARMTargetParser.cpp b/llvm/lib/TargetParser/ARMTargetParser.cpp
--- a/llvm/lib/TargetParser/ARMTargetParser.cpp
+++ b/llvm/lib/TargetParser/ARMTargetParser.cpp
@@ -523,7 +523,7 @@
   default:
     if (TT.isOSNetBSD())
       return "apcs-gnu";
-    if (TT.isOSOpenBSD())
+    if (TT.isOSOpenBSD() || TT.isOHOSFamily())
       return "aapcs-linux";
     return "aapcs";
   }
diff --git a/llvm/lib/TargetParser/Triple.cpp b/llvm/lib/TargetParser/Triple.cpp
--- a/llvm/lib/TargetParser/Triple.cpp
+++ b/llvm/lib/TargetParser/Triple.cpp
@@ -243,6 +243,7 @@
   case Win32: return "windows";
   case ZOS: return "zos";
   case ShaderModel: return "shadermodel";
+  case LiteOS: return "liteos";
   }
 
   llvm_unreachable("Invalid OSType");
@@ -290,6 +291,7 @@
   case Callable: return "callable";
   case Mesh: return "mesh";
   case Amplification: return "amplification";
+  case OpenHOS: return "ohos";
   }
 
   llvm_unreachable("Invalid EnvironmentType!");
@@ -596,6 +598,7 @@
     .StartsWith("wasi", Triple::WASI)
     .StartsWith("emscripten", Triple::Emscripten)
     .StartsWith("shadermodel", Triple::ShaderModel)
+    .StartsWith("liteos", Triple::LiteOS)
     .Default(Triple::UnknownOS);
 }
 
@@ -640,6 +643,7 @@
       .StartsWith("callable", Triple::Callable)
       .StartsWith("mesh", Triple::Mesh)
       .StartsWith("amplification", Triple::Amplification)
+      .StartsWith("ohos", Triple::OpenHOS)
       .Default(Triple::UnknownEnvironment);
 }
 
diff --git a/llvm/test/CodeGen/AArch64/arm64-platform-reg.ll b/llvm/test/CodeGen/AArch64/arm64-platform-reg.ll
--- a/llvm/test/CodeGen/AArch64/arm64-platform-reg.ll
+++ b/llvm/test/CodeGen/AArch64/arm64-platform-reg.ll
@@ -2,6 +2,7 @@
 ; RUN: llc -mtriple=arm64-freebsd-gnu -mattr=+reserve-x18 -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE --check-prefix=CHECK-RESERVE-X18
 ; RUN: llc -mtriple=arm64-linux-gnu -o - %s | FileCheck %s
 ; RUN: llc -mtriple=aarch64-linux-android -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE --check-prefix=CHECK-RESERVE-X18
+; RUN: llc -mtriple=aarch64-linux-ohos -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE --check-prefix=CHECK-RESERVE-X18
 ; RUN: llc -mtriple=aarch64-fuchsia -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE --check-prefix=CHECK-RESERVE-X18
 ; RUN: llc -mtriple=aarch64-windows -o - %s | FileCheck %s --check-prefix=CHECK-RESERVE --check-prefix=CHECK-RESERVE-X18
 
diff --git a/llvm/unittests/TargetParser/TripleTest.cpp b/llvm/unittests/TargetParser/TripleTest.cpp
--- a/llvm/unittests/TargetParser/TripleTest.cpp
+++ b/llvm/unittests/TargetParser/TripleTest.cpp
@@ -876,6 +876,18 @@
   EXPECT_EQ(Triple::UnknownOS, T.getOS());
   EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
 
+  T = Triple("arm-unknown-linux-ohos");
+  EXPECT_EQ(Triple::arm, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::Linux, T.getOS());
+  EXPECT_EQ(Triple::OpenHOS, T.getEnvironment());
+
+  T = Triple("arm-unknown-liteos");
+  EXPECT_EQ(Triple::arm, T.getArch());
+  EXPECT_EQ(Triple::UnknownVendor, T.getVendor());
+  EXPECT_EQ(Triple::LiteOS, T.getOS());
+  EXPECT_EQ(Triple::UnknownEnvironment, T.getEnvironment());
+
   T = Triple("huh");
   EXPECT_EQ(Triple::UnknownArch, T.getArch());
 }