Index: lldb/include/lldb/Utility/ArchSpec.h
===================================================================
--- lldb/include/lldb/Utility/ArchSpec.h
+++ lldb/include/lldb/Utility/ArchSpec.h
@@ -108,6 +108,12 @@
     eRISCVSubType_riscv64,
   };
 
+  enum LOONGARCHSubType {
+    eLOONGARCHSubType_unknown,
+    eLOONGARCHSubType_loongarch32,
+    eLOONGARCHSubType_loongarch64,
+  };
+
   enum Core {
     eCore_arm_generic,
     eCore_arm_armv4,
@@ -204,6 +210,9 @@
     eCore_riscv32,
     eCore_riscv64,
 
+    eCore_loongarch32,
+    eCore_loongarch64,
+
     eCore_uknownMach32,
     eCore_uknownMach64,
 
Index: lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
===================================================================
--- lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
+++ lldb/source/Plugins/ObjectFile/ELF/ObjectFileELF.cpp
@@ -320,6 +320,18 @@
     return ArchSpec::eCore_ppc64_generic;
 }
 
+static uint32_t loongarchVariantFromElfFlags(const elf::ELFHeader &header) {
+  uint32_t fileclass = header.e_ident[EI_CLASS];
+  switch (fileclass) {
+  case llvm::ELF::ELFCLASS32:
+    return ArchSpec::eLOONGARCHSubType_loongarch32;
+  case llvm::ELF::ELFCLASS64:
+    return ArchSpec::eLOONGARCHSubType_loongarch64;
+  default:
+    return ArchSpec::eLOONGARCHSubType_unknown;
+  }
+}
+
 static uint32_t subTypeFromElfHeader(const elf::ELFHeader &header) {
   if (header.e_machine == llvm::ELF::EM_MIPS)
     return mipsVariantFromElfFlags(header);
@@ -327,6 +339,8 @@
     return ppc64VariantFromElfFlags(header);
   else if (header.e_machine == llvm::ELF::EM_RISCV)
     return riscvVariantFromElfFlags(header);
+  else if (header.e_machine == llvm::ELF::EM_LOONGARCH)
+    return loongarchVariantFromElfFlags(header);
 
   return LLDB_INVALID_CPUTYPE;
 }
Index: lldb/source/Utility/ArchSpec.cpp
===================================================================
--- lldb/source/Utility/ArchSpec.cpp
+++ lldb/source/Utility/ArchSpec.cpp
@@ -220,6 +220,11 @@
     {eByteOrderLittle, 8, 2, 4, llvm::Triple::riscv64, ArchSpec::eCore_riscv64,
      "riscv64"},
 
+    {eByteOrderLittle, 4, 1, 4, llvm::Triple::loongarch32,
+     ArchSpec::eCore_loongarch32, "loongarch32"},
+    {eByteOrderLittle, 8, 1, 4, llvm::Triple::loongarch64,
+     ArchSpec::eCore_loongarch64, "loongarch64"},
+
     {eByteOrderLittle, 4, 4, 4, llvm::Triple::UnknownArch,
      ArchSpec::eCore_uknownMach32, "unknown-mach-32"},
     {eByteOrderLittle, 8, 4, 4, llvm::Triple::UnknownArch,
@@ -406,6 +411,12 @@
      ArchSpec::eRISCVSubType_riscv32, 0xFFFFFFFFu, 0xFFFFFFFFu}, // riscv32
     {ArchSpec::eCore_riscv64, llvm::ELF::EM_RISCV,
      ArchSpec::eRISCVSubType_riscv64, 0xFFFFFFFFu, 0xFFFFFFFFu}, // riscv64
+    {ArchSpec::eCore_loongarch32, llvm::ELF::EM_LOONGARCH,
+     ArchSpec::eLOONGARCHSubType_loongarch32, 0xFFFFFFFFu,
+     0xFFFFFFFFu}, // loongarch32
+    {ArchSpec::eCore_loongarch64, llvm::ELF::EM_LOONGARCH,
+     ArchSpec::eLOONGARCHSubType_loongarch64, 0xFFFFFFFFu,
+     0xFFFFFFFFu}, // loongarch64
 };
 
 static const ArchDefinition g_elf_arch_def = {
Index: lldb/test/Shell/ObjectFile/ELF/loongarch-arch.yaml
===================================================================
--- /dev/null
+++ lldb/test/Shell/ObjectFile/ELF/loongarch-arch.yaml
@@ -0,0 +1,24 @@
+# RUN: yaml2obj --docnum=1 %s > %t32
+# RUN: yaml2obj --docnum=2 %s > %t64
+# RUN: lldb-test object-file %t32 | FileCheck --check-prefix=CHECK-LA32 %s
+# RUN: lldb-test object-file %t64 | FileCheck --check-prefix=CHECK-LA64 %s
+
+# CHECK-LA32: Architecture: loongarch32--
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS32
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_LOONGARCH
+...
+
+# CHECK-LA64: Architecture: loongarch64--
+
+--- !ELF
+FileHeader:
+  Class:           ELFCLASS64
+  Data:            ELFDATA2LSB
+  Type:            ET_EXEC
+  Machine:         EM_LOONGARCH
+...